From ce96b5b9742c81cad6d902eaf793b792c1b8943b Mon Sep 17 00:00:00 2001 From: charles Date: Tue, 26 Nov 2002 01:15:37 +0000 Subject: [PATCH] *** empty log message *** --- Documentation/yaffs2.html | 756 +++ Documentation/yaffs_on_mtd.html | 7 +- Makefile | 17 +- snMakefile | 2 +- yaffs_fs.c | 117 +- yaffs_guts.c | 8844 ++++++++++++++++--------------- yaffs_guts.h | 1068 ++-- yaffs_mtdif.c | 40 +- yaffs_ramem.c | 10 +- yaffsdev.proj | Bin 53248 -> 53248 bytes yportenv.h | 322 +- 11 files changed, 6007 insertions(+), 5176 deletions(-) create mode 100644 Documentation/yaffs2.html diff --git a/Documentation/yaffs2.html b/Documentation/yaffs2.html new file mode 100644 index 0000000..e83dcc6 --- /dev/null +++ b/Documentation/yaffs2.html @@ -0,0 +1,756 @@ + + + + + + + + + + + + +

YAFFS2

Summary

The original motivation for YAFFS 2 was to add support for the new +NAND with 2kB pages instead of 512-byte pages and strictly sequential +page writing order. +

To achieve this, a new design is used which also realises the +following benefits:

zero page rewrites, which means faster operation. (YAFFS1 + uses a single rewrite in the spare area to delete a page).
+
ability to exploit simultaneous page programming on some + chips.
+
improves performance relative to YAFFS1 speed(write:1.5x to + 5x, delete: 4x, garbage collection: 2x)
+
lower RAM footprint (approx. 25% to 50% of YAFFS1, depending + on chunk size used).
+
Can support Toshiba/Sandisk MLC parts.
+
Runtime selection between various chunk sizes.
+

Most of YAFFS and YAFFS2 code is common, therefore the code will +likely be kept common with YAFFS vs YAFFS2 being run-time selected.

Method

The main philosophical difference between YAFFS and YAFFS2 is how +discarded status is tracked. Since we can't do any re-writing, we +can't use the "discarded" flags in YAFFS2.

Instead YAFFS2 uses two mechanisms to resolve data state.

YAFFS2 chunks have more tag information, including a block + sequence Id. From that we can determine the chunk sequence Id since + the chunks are allocated sequentially in a block. Thus we always + know the patch order for all chunks in the system.
+
The above helps us track stale -vs- fresh data, but does not + help determine when a file/object is deleted. Deletion is achieved + by moving the object to the "unlinked" directory. We also + keep track of the number of chunks (both stale and current) in the + system for each object. While this number indicates that there are + still chunks associated with this object we keep the deletion + record. When the last trace of the object has been really erased + from NAND, we can forget about the deletion record too. +
+
Since there is no deletion, a resize (shrinking) of a file + will still have valid data chunks past the end of file on the NAND. + However, we write a new ObjectHeader at the time of the resize, + therefore this shows the shrunken file size.
+

This changes erasure slightly:

During garbage collection we can't just look at chunk state + flags, instead we must read the tags of each chunk to determine + which object's chunk count we must decrement. This step must also be + performed when a block is erased (as part of deletion).
+

This makes erasure & garbage collection more expensive (by +adding reads), but remember that ion YAFFS2 we don't need to do page +deletions which are much more expensive operations. Thus, all-up +YAFFS2 wins.

Tag structure

Each chunk in YAFFS2 has the following information:

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ Field +	+ Comment +	+ Size for 1kb chunks +	+ Size for 2kB chunks +
+ blockState +	+ Block state. non-0xFF for bad block +	+ 1 byte +	+ 1 byte +
+ chunkId +	+ 32-bit chunk Id +	+ 4 bytes +	+ 4 bytes +
+ objectId +	+ 32-bit object Id +	+ 4 bytes +	+ 4 bytes +
+ nBytes +	+ Number of data bytes in this chunk +	+ 2 bytes +	+ 2 bytes +
+ blockSequence +	+ sequence number for this block +	+ 4 bytes +	+ 4 bytes +
+ tagsEcc +	+ ECC on tags area +	+ 3 bytes +	+ 3 bytes +
+ ecc +	+ ECC, 3 bytes/256 bytes of data +	+ 12 bytes +	+ 24 bytes +
+ Total +	+ + +	+ 30 bytes +	+ 42 bytes +

To get enough spare bytes for this tagging structure requires a +chunk-size of at least 1kB. YAFFS1 is still used for 512-byte chunk +sizes.

The blockSequence increments each time a block is allocated. (ie. +the first block allocated is block 1, and so on).

Scanning

The only reason we need to keep track of data status on NAND is to +be able to recreate the file system state during scanning. Since we +no longer have chunk deletion status flags we use a slightly +different process for scanning a YAFFS2 system.

In effect, YAFFS2 recreates its state by "replaying the +tape". ie. it scans the chunks in their allocation order (block +sequence Id order) rather than in their order on the media. This +implies that at start up, the blocks must be read and their block +sequence determined.

Performance

These numbers are indicative of relative performance. These only +apply to the NAND data transfer and do not include other overheads.

As an example, read/write cycle times of 100nS are used (though +NAND can typically do 50nS), "seek time" of 10uS and +program time of 200uS. Mileage will vary.

NB x16 means using a 16-bit bus. Clearly this cuts down on data +transfer time relative to an 8-bit bus.

Times for 2kB read(units of 1uS).

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ Operation +	+ YAFFS1 +	+ YAFFS2 (512b pages) +	+ YAFFS2 (2kB pages) +	+ YAFFS2(2kB pages, x16) +
+ Seek + +	+ 40 +	+ 40 +	+ 10 +	+ 10 +
+ Read +	+ 220 +	+ 220 +	+ 220 +	+ 110 +
+ Total +	+ 260 +	+ 260 +	+ 230 +	+ 120 +
+ MB/s +	+ 7.6 +	+ 7.6 +	+ 8.7 +	+ 16.7 +
+ Relative speed +	+ 1 +	+ 1 +	+ 1.1 +	+ 2.2 +

Times for 2kB writes(units of 1uS).

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ Operation +	+ YAFFS1 +	+ YAFFS2 (512b pages) +	+ YAFFS2 (2kB pages) +	+ YAFFS2(2kB pages, x16) +
+ Seek +	+ 40 +	+ 40 +	+ 10 +	+ 10 +
+ Program +	+ 800 +	+ 800 +	+ 200 +	+ 200 +
+ Seek +	+ 40 +	+ 40 +	+ 10 +	+ 10 +
+ Read +	+ 220 +	+ 220 +	+ 220 +	+ 110 +
+ Total +	+ 1320 +	+ 1320 +	+ 660 +	+ 440 +
+ MB/s +	+ 1.5 +	+ 1.5 +	+ 3 +	+ 4.5 +
+ Relative speed +	+ 1 +	+ 1 +	+ 2 +	+ 3 +

Times for 1MB delete (units of 1uS).

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ Operation +	+ YAFFS1 +	+ YAFFS2 (512b pages) +	+ YAFFS2 (2kB pages) +	+ YAFFS2(2kB pages, x16) +
+ Seek +	+ 20480 +	+ 0 +	+ 0 +	+ 0 +
+ Program +	+ 409600 +	+ 0 +	+ 0 +	+ 0 +
+ Erase +	+ 128000 +	+ 128000 +	+ 16000 +	+ 16000 +
+ Total +	+ 558080 +	+ 128000 +	+ 16000 +	+ 16000 +
+ MB/s +	+ 1.8 +	+ 7.8 +	+ 62.5 +	+ 62.5 +
+ Relative speed +	+ 1 +	+ 4 +	+ 34 +	+ 34 +

Times for 1MB of garbage collection at 50% dirty (units of 1uS).

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +

+ Operation +	+ YAFFS1 +	+ YAFFS2 (512b pages) +	+ YAFFS2 (2kB pages) +	+ YAFFS2(2kB pages, x16) +
+ Delete 1MB +	+ 558080 +	+ 128000 +	+ 16000 +	+ 16000 +
+ Write 0.5MB +	+ 337920 +	+ 337920 +	+ 168960 +	+ 112640 +
+ Total +	+ 896000 +	+ 465920 +	+ 184960 +	+ 128640 +
+ MB/s +	+ 1.1 +	+ 2.1 +	+ 5.4 +	+ 7.7 +
+ Relative speed +	+ 1 +	+ 1.9 +	+ 4.9 +	+ 7 +

$Id: yaffs2.html,v 1.1 2002-11-26 01:15:37 charles Exp $

+ + \ No newline at end of file diff --git a/Documentation/yaffs_on_mtd.html b/Documentation/yaffs_on_mtd.html index bba25e7..f35591e 100644 --- a/Documentation/yaffs_on_mtd.html +++ b/Documentation/yaffs_on_mtd.html @@ -6,7 +6,7 @@ - +

Running up YAFFS using the MTD interface

@@ -80,6 +80,11 @@ NAND, with a few issues.

$Id: yaffs_on_mtd.html,v 1.3 2002-11-26 01:15:38 charles Exp $

diff --git a/Makefile b/Makefile index e8c77e1..633c1b1 100644 --- a/Makefile +++ b/Makefile @@ -12,7 +12,7 @@ # it under the terms of the GNU General Public License version 2 as # published by the Free Software Foundation. # -# $Id: Makefile,v 1.7 2002-11-08 07:19:41 charles Exp $ +# $Id: Makefile,v 1.8 2002-11-26 01:15:37 charles Exp $ # ## Change or override KERNELDIR to your kernel @@ -36,6 +36,19 @@ USE_RAM_FOR_TEST = -DCONFIG_YAFFS_RAM_ENABLED USE_MTD = -DCONFIG_YAFFS_MTD_ENABLED +# CONFIG_YAFFS_USE_OLD_MTD +# Enable this to use the old MTD stuff that did not have yaffs support. +# You can use this to get around compilation problems, but the best +# thing to do is to upgrade your MTD support. You will get better speed. + +#USE_OLD_MTD = -DCONFIG_YAFFS_USE_OLD_MTD + +# CONFIG_YAFFS_USE_NANDECC +# This enables the ECC functions of the generic MTD-NAND driver. +# This will not work if you are using the old mtd. + +USE_NANDECC = -DCONFIG_YAFFS_USE_NANDECC + # CONFIG_YAFFS_USE_GENERIC_RW # Use generic_read/generic_write for reading/writing files. This enables the use of the Linux # file caching layer. @@ -77,7 +90,7 @@ ENABLE_SHORT_NAMES_IN_RAM = -DCONFIG_SHORT_NAMES_IN_RAM # End of configuration options. YAFFS_CONFIGS = $(USE_RAM_FOR_TEST) $(USE_MTD) $(USE_GENERIC_RW) $(USE_HEADER_FILE_SIZE) $(IGNORE_CHUNK_ERASED) $(IGNORE_WRITE_VERIFY) \ - $(ENABLE_SHORT_NAMES_IN_RAM) + $(ENABLE_SHORT_NAMES_IN_RAM) $(USE_NANDECC) $(USE_OLD_MTD) CFLAGS = -D__KERNEL__ -DMODULE $(YAFFS_CONFIGS) -I$(KERNELDIR)/include -O2 -Wall diff --git a/snMakefile b/snMakefile index 58d3abd..c27a5cb 100644 --- a/snMakefile +++ b/snMakefile @@ -1,6 +1,6 @@ ######################################################### # Makefile auto generated by Cygnus Source Navigator. -# Target: yaffsdev_disk Date: Nov 08 2002 Time: 07:50:14 PM +# Target: yaffsdev_disk Date: Nov 26 2002 Time: 01:05:25 PM # diff --git a/yaffs_fs.c b/yaffs_fs.c index 473078e..da3b7f9 100644 --- a/yaffs_fs.c +++ b/yaffs_fs.c @@ -27,7 +27,7 @@ */ -const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.19 2002-11-22 00:12:23 charles Exp $"; +const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.20 2002-11-26 01:15:37 charles Exp $"; extern const char *yaffs_guts_c_version; @@ -67,7 +67,7 @@ unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS | YAFFS_TRACE_BAD_BLOCKS; #include "yaffs_mtdif.h" #endif //CONFIG_YAFFS_MTD_ENABLED -#define T(x) printk x +//#define T(x) printk x @@ -182,14 +182,14 @@ static struct super_operations yaffs_super_ops = { static void yaffs_GrossLock(yaffs_Device *dev) { - T((KERN_DEBUG"yaffs locking\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs locking\n")); down(&dev->grossLock); } static void yaffs_GrossUnlock(yaffs_Device *dev) { - T((KERN_DEBUG"yaffs unlocking\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs unlocking\n")); up(&dev->grossLock); } @@ -254,7 +254,7 @@ static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry) yaffs_GrossLock(dev); - T((KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup for %d:%s\n",yaffs_InodeToObject(dir)->objectId,dentry->d_name.name)); obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),dentry->d_name.name); @@ -264,13 +264,13 @@ static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry) if(obj) { - T((KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup found %d\n",obj->objectId)); inode = yaffs_get_inode(dir->i_sb, obj->st_mode,0,obj); if(inode) { - T((KERN_DEBUG"yaffs_loookup dentry \n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_loookup dentry \n")); //dget(dentry); // try to solve directory bug d_add(dentry,inode); @@ -283,7 +283,7 @@ static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry) } else { - T((KERN_DEBUG"yaffs_lookup not found\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_lookup not found\n")); } yaffs_GrossUnlock(dev); @@ -297,7 +297,7 @@ static struct dentry * yaffs_lookup(struct inode *dir, struct dentry *dentry) // Put inode is called when the inode **structure** is put. static void yaffs_put_inode(struct inode *inode) { - T(("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count))); + T(YAFFS_TRACE_OS,("yaffs_put_inode: ino %d, count %d\n",(int)inode->i_ino, atomic_read(&inode->i_count))); } @@ -306,7 +306,7 @@ static void yaffs_clear_inode(struct inode *inode) { yaffs_Object *obj = yaffs_InodeToObject(inode); - T(("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count), + T(YAFFS_TRACE_OS,("yaffs_clear_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count), obj ? "object exists" : "null object")); if(obj) @@ -327,7 +327,7 @@ static void yaffs_delete_inode(struct inode *inode) yaffs_Object *obj = yaffs_InodeToObject(inode); yaffs_Device *dev; - T(("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count), + T(YAFFS_TRACE_OS,("yaffs_delete_inode: ino %d, count %d %s\n",(int)inode->i_ino, atomic_read(&inode->i_count), obj ? "object exists" : "null object")); if(obj) @@ -347,7 +347,7 @@ static int yaffs_file_flush(struct file* file) yaffs_Device *dev = obj->myDev; - T((KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId, + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_flush object %d (%s)\n",obj->objectId, obj->dirty ? "dirty" : "clean")); yaffs_GrossLock(dev); @@ -371,7 +371,7 @@ static int yaffs_readpage_nolock(struct file *f, struct page * pg) yaffs_Device *dev; - T((KERN_DEBUG"yaffs_readpage at %08x, size %08x\n", + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage at %08x, size %08x\n", (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE)); obj = yaffs_DentryToObject(f->f_dentry); @@ -405,7 +405,7 @@ static int yaffs_readpage_nolock(struct file *f, struct page * pg) kunmap(pg); - T((KERN_DEBUG"yaffs_readpage done\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readpage done\n")); return ret; } @@ -425,7 +425,7 @@ static int yaffs_readpage(struct file *f, struct page * pg) static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to) { - T((KERN_DEBUG"yaffs_prepair_write\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_prepair_write\n")); if(!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE)) return yaffs_readpage_nolock(f,pg); @@ -444,13 +444,13 @@ static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned spos = pos; unsigned saddr = (unsigned)addr; - T((KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write addr %x pos %x nBytes %d\n",saddr,spos,nBytes)); nWritten = yaffs_file_write(f,addr, nBytes, &pos); if(nWritten != nBytes) { - T((KERN_DEBUG"yaffs_commit_write not same size nWritten %d nBytes %d\n",nWritten,nBytes)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write not same size nWritten %d nBytes %d\n",nWritten,nBytes)); SetPageError(pg); ClearPageUptodate(pg); } @@ -459,7 +459,7 @@ static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, SetPageUptodate(pg); } - T((KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_commit_write returning %d\n",nWritten)); return nWritten; @@ -484,7 +484,7 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj) inode->i_size = yaffs_GetObjectFileLength(obj); inode->i_nlink = yaffs_GetObjectLinkCount(obj); - T((KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n", + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FillInode mode %x uid %d gid %d size %d count %d\n", inode->i_mode, inode->i_uid, inode->i_gid, (int)inode->i_size, atomic_read(&inode->i_count))); switch (obj->st_mode & S_IFMT) @@ -513,7 +513,7 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj) } else { - T((KERN_DEBUG"yaffs_FileInode invalid parameters\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_FileInode invalid parameters\n")); } } @@ -522,7 +522,7 @@ struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,yaffs_Ob { struct inode * inode; - T((KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_get_inode for object %d\n",obj->objectId)); inode = iget(sb,obj->objectId); @@ -539,7 +539,7 @@ static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos) struct inode *inode; yaffs_Device *dev; - T((KERN_DEBUG"yaffs_file_read\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read\n")); obj = yaffs_DentryToObject(f->f_dentry); @@ -571,7 +571,7 @@ static ssize_t yaffs_file_read(struct file *f, char *buf, size_t n, loff_t *pos) ipos = *pos; - T((KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_read read %d bytes, %d read at %d\n",n,nRead,ipos)); return nRead; } @@ -605,16 +605,16 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_ if(!obj) { - T((KERN_DEBUG"yaffs_file_write: hey obj is null!\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write: hey obj is null!\n")); } else { - T((KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write about to write writing %d bytes to object %d at %d\n",n,obj->objectId,ipos)); } nWritten = yaffs_WriteDataToFile(obj,buf,ipos,n); - T((KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write writing %d bytes, %d written at %d\n",n,nWritten,ipos)); if(nWritten > 0) { ipos += nWritten; @@ -624,7 +624,7 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_ inode->i_size = ipos; inode->i_blocks = (ipos + inode->i_blksize - 1)/ inode->i_blksize; - T((KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks))); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_file_write size updated to %d bytes, %d blocks\n",ipos,(int)(inode->i_blocks))); } } @@ -652,11 +652,11 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) offset = f->f_pos; - T(("yaffs_readdir: starting at %d\n",(int)offset)); + T(YAFFS_TRACE_OS,("yaffs_readdir: starting at %d\n",(int)offset)); if(offset == 0) { - T((KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry . ino %d \n",(int)inode->i_ino)); if(filldir(dirent,".",1,offset,inode->i_ino,DT_DIR) < 0) { goto out; @@ -666,7 +666,7 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) } if(offset == 1) { - T((KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: entry .. ino %d \n",(int)f->f_dentry->d_parent->d_inode->i_ino)); if(filldir(dirent,"..",2,offset,f->f_dentry->d_parent->d_inode->i_ino,DT_DIR) < 0) { goto out; @@ -685,7 +685,7 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) l = list_entry(i, yaffs_Object,siblings); yaffs_GetObjectName(l,name,YAFFS_MAX_NAME_LENGTH+1); - T((KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l))); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_readdir: %s inode %d\n",name,yaffs_GetObjectInode(l))); if(filldir(dirent, name, @@ -728,16 +728,16 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int r if(parent) { - T((KERN_DEBUG"yaffs_mknod: parent object %d type %d\n", + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: parent object %d type %d\n", parent->objectId,parent->variantType)); } else { - T((KERN_DEBUG"yaffs_mknod: could not get parent object\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: could not get parent object\n")); return -EPERM; } - T(("yaffs_mknod: making oject for %s, mode %x dev %x\n", + T(YAFFS_TRACE_OS,("yaffs_mknod: making oject for %s, mode %x dev %x\n", dentry->d_name.name, mode,rdev)); dev = parent->myDev; @@ -748,19 +748,19 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int r { default: // Special (socket, fifo, device...) - T((KERN_DEBUG"yaffs_mknod: making special\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making special\n")); obj = yaffs_MknodSpecial(parent,dentry->d_name.name,mode,current->uid, current->gid,rdev); break; case S_IFREG: // file - T((KERN_DEBUG"yaffs_mknod: making file\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n")); obj = yaffs_MknodFile(parent,dentry->d_name.name,mode,current->uid, current->gid); break; case S_IFDIR: // directory - T((KERN_DEBUG"yaffs_mknod: making directory\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making directory\n")); obj = yaffs_MknodDirectory(parent,dentry->d_name.name,mode,current->uid, current->gid); break; case S_IFLNK: // symlink - T((KERN_DEBUG"yaffs_mknod: making file\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod: making file\n")); obj = NULL; // Do we ever get here? break; } @@ -769,12 +769,12 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int r { inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); d_instantiate(dentry, inode); - T((KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count))); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod created object %d count = %d\n",obj->objectId,atomic_read(&inode->i_count))); error = 0; } else { - T((KERN_DEBUG"yaffs_mknod failed making object\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mknod failed making object\n")); error = -ENOMEM; } @@ -786,7 +786,7 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, int r static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode) { int retVal; - T((KERN_DEBUG"yaffs_mkdir\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_mkdir\n")); retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); #if 0 // attempt to fix dir bug - didn't work @@ -800,7 +800,7 @@ static int yaffs_mkdir(struct inode * dir, struct dentry * dentry, int mode) static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode) { - T((KERN_DEBUG"yaffs_create\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_create\n")); return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); } @@ -808,12 +808,11 @@ static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode) static int yaffs_unlink(struct inode * dir, struct dentry *dentry) { int retVal; - int nlinks; yaffs_Device *dev; - T((KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_unlink %d:%s\n",(int)(dir->i_ino),dentry->d_name.name)); dev = yaffs_InodeToObject(dir)->myDev; @@ -848,7 +847,7 @@ static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dent yaffs_Object *link=NULL; yaffs_Device *dev; - T((KERN_DEBUG"yaffs_link\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link\n")); obj = yaffs_InodeToObject(inode); dev = obj->myDev; @@ -863,7 +862,7 @@ static int yaffs_link(struct dentry *old_dentry, struct inode * dir, struct dent old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj); d_instantiate(dentry, old_dentry->d_inode); atomic_inc(&old_dentry->d_inode->i_count); - T((KERN_DEBUG"yaffs_link link count %d i_count %d\n", + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_link link count %d i_count %d\n", old_dentry->d_inode->i_nlink,atomic_read(&old_dentry->d_inode->i_count))); } @@ -887,7 +886,7 @@ static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * yaffs_Object *obj; yaffs_Device *dev; - T((KERN_DEBUG"yaffs_symlink\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_symlink\n")); dev = yaffs_InodeToObject(dir)->myDev; yaffs_GrossLock(dev); @@ -903,12 +902,12 @@ static int yaffs_symlink(struct inode * dir, struct dentry *dentry, const char * inode = yaffs_get_inode(dir->i_sb, obj->st_mode, 0, obj); d_instantiate(dentry, inode); - T((KERN_DEBUG"symlink created OK\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink created OK\n")); return 0; } else { - T((KERN_DEBUG"symlink not created\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"symlink not created\n")); } @@ -925,7 +924,7 @@ static int yaffs_sync_object(struct file * file, struct dentry *dentry, int data dev = obj->myDev; - T((KERN_DEBUG"yaffs_sync_object\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_sync_object\n")); yaffs_GrossLock(dev); yaffs_FlushFile(obj); yaffs_GrossUnlock(dev); @@ -972,7 +971,7 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) int error; yaffs_Device *dev; - T((KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_setattr of object %d\n",yaffs_InodeToObject(inode)->objectId)); if((error = inode_change_ok(inode,attr)) == 0) { @@ -996,7 +995,7 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) static int yaffs_statfs(struct super_block *sb, struct statfs *buf) { yaffs_Device *dev = yaffs_SuperToDevice(sb); - T((KERN_DEBUG"yaffs_statfs\n")); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_statfs\n")); yaffs_GrossLock(dev); @@ -1023,7 +1022,7 @@ static void yaffs_read_inode (struct inode *inode) yaffs_Object *obj ; yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb); - T((KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino)); + T(YAFFS_TRACE_OS,(KERN_DEBUG"yaffs_read_inode for %d\n",(int)inode->i_ino)); obj = yaffs_FindObjectByNumber(dev,inode->i_ino); @@ -1103,10 +1102,10 @@ static struct super_block *yaffs_internal_read_super(int useRam, struct super_bl sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; #endif - T(("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize))); + T(YAFFS_TRACE_OS,("yaffs_read_super: %s block size %d\n", useRam ? "RAM" : "MTD",(int)(sb->s_blocksize))); #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY - T(("yaffs: Write verification disabled. All guarantees null and void\n"); + T(YAFFS_TRACE_OS,("yaffs: Write verification disabled. All guarantees null and void\n"); #endif @@ -1231,7 +1230,7 @@ static struct super_block *yaffs_internal_read_super(int useRam, struct super_bl yaffs_GrossLock(dev); yaffs_GutsInitialise(yaffs_SuperToDevice(sb)); - T(("yaffs_read_super: guts initialised\n")); + T(YAFFS_TRACE_OS,("yaffs_read_super: guts initialised\n")); // Create root inode inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,yaffs_Root(yaffs_SuperToDevice(sb))); @@ -1241,12 +1240,12 @@ static struct super_block *yaffs_internal_read_super(int useRam, struct super_bl if (!inode) return NULL; - T(("yaffs_read_super: got root inode\n")); + T(YAFFS_TRACE_OS,("yaffs_read_super: got root inode\n")); root = d_alloc_root(inode); - T(("yaffs_read_super: d_alloc_root done\n")); + T(YAFFS_TRACE_OS,("yaffs_read_super: d_alloc_root done\n")); if (!root) { iput(inode); @@ -1254,7 +1253,7 @@ static struct super_block *yaffs_internal_read_super(int useRam, struct super_bl } sb->s_root = root; - T(("yaffs_read_super: done\n")); + T(YAFFS_TRACE_OS,("yaffs_read_super: done\n")); return sb; } diff --git a/yaffs_guts.c b/yaffs_guts.c index 32b7559..0069da4 100644 --- a/yaffs_guts.c +++ b/yaffs_guts.c @@ -1,4411 +1,4433 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * yaffs_guts.c The main guts of YAFFS - * - * Copyright (C) 2002 Aleph One Ltd. - * for Toby Churchill Ltd and Brightstar Engineering - * - * Created by Charles Manning - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - //yaffs_guts.c - -const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.12 2002-11-08 07:19:41 charles Exp $"; - -#include "yportenv.h" - -#include "yaffsinterface.h" -#include "yaffs_guts.h" - - -#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2 - - - -// External functions for ECC on data -void nand_calculate_ecc (const u_char *dat, u_char *ecc_code); -int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc); - - -// countBits is a quick way of counting the number of bits in a byte. -// ie. countBits[n] holds the number of 1 bits in a byte with the value n. - -static const char yaffs_countBitsTable[256] = -{ -0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, -4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 -}; - -static int yaffs_CountBits(__u8 x) -{ - int retVal; - retVal = yaffs_countBitsTable[x]; - return retVal; -} - - - -// Local prototypes -static int yaffs_CheckObjectHashSanity(yaffs_Device *dev); -static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr); -static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr); -static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan); - -static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type); -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj); -static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force); -static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId); -static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); -static int yaffs_CheckStructures(void); -static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit); -static int yaffs_DoGenericObjectDeletion(yaffs_Object *in); - -static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo); - -// Robustification -static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND); -static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND); -static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND); -static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare); -static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare); - -static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND); - -static int yaffs_UnlinkWorker(yaffs_Object *obj); - - -static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1); - - - -loff_t yaffs_GetFileSize(yaffs_Object *obj); - -static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted); -static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted); - - -static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve); - -#ifdef YAFFS_PARANOID -static int yaffs_CheckFileSanity(yaffs_Object *in); -#else -#define yaffs_CheckFileSanity(in) -#endif - -static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in); -static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId); - - -static __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk) -{ - if(blk < dev->startBlock || blk > dev->endBlock) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: block %d is not valid" TENDSTR),blk)); - YBUG(); - } - return &dev->blockInfo[blk - dev->startBlock]; -} - - -static __inline__ int yaffs_HashFunction(int n) -{ - return (n % YAFFS_NOBJECT_BUCKETS); -} - - -yaffs_Object *yaffs_Root(yaffs_Device *dev) -{ - return dev->rootDir; -} - -yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) -{ - return dev->lostNFoundDir; -} - - -static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare) -{ - if(chunkInNAND < dev->startBlock * YAFFS_CHUNKS_PER_BLOCK) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND)); - return YAFFS_FAIL; - } - - dev->nPageWrites++; - return dev->writeChunkToNAND(dev,chunkInNAND,data,spare); -} - - -int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev, - int chunkInNAND, - __u8 *data, - yaffs_Spare *spare, - int doErrorCorrection) -{ - int retVal; - __u8 calcEcc[3]; - yaffs_Spare localSpare; - int eccResult1,eccResult2; - - dev->nPageReads++; - - - - - if(!spare && data) - { - // If we don't have a real spare, then we use a local one. - // Need this for the calculation of the ecc - spare = &localSpare; - } - - retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare); - if(data && doErrorCorrection) - { - // Do ECC correction - //Todo handle any errors - nand_calculate_ecc(data,calcEcc); - eccResult1 = nand_correct_data (data,spare->ecc1, calcEcc); - nand_calculate_ecc(&data[256],calcEcc); - eccResult2 = nand_correct_data (&data[256],spare->ecc2, calcEcc); - - if(eccResult1>0) - { - T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND)); - dev->eccFixed++; - } - else if(eccResult1<0) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND)); - dev->eccUnfixed++; - } - - if(eccResult2>0) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND)); - dev->eccFixed++; - } - else if(eccResult2<0) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND)); - dev->eccUnfixed++; - } - - if(eccResult1 || eccResult2) - { - // Hoosterman, we had a data problem on this page - yaffs_HandleReadDataError(dev,chunkInNAND); - } - } - - return retVal; -} - - -static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND) -{ - - static int init = 0; - static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK]; - static __u8 data[YAFFS_BYTES_PER_CHUNK]; - static __u8 spare[16]; - - - dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare); - - - - if(!init) - { - memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK); - init = 1; - } - - if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return YAFFS_FAIL; - if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL; - - - return YAFFS_OK; - -} - - - -int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND) -{ - dev->nBlockErasures++; - return dev->eraseBlockInNAND(dev,blockInNAND); -} - -int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev) -{ - return dev->initialiseNAND(dev); -} - -static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve) -{ - int chunk; - - int writeOk = 1; - int attempts = 0; - - unsigned char rbData[YAFFS_BYTES_PER_CHUNK]; - yaffs_Spare rbSpare; - - do{ - chunk = yaffs_AllocateChunk(dev,useReserve); - - if(chunk >= 0) - { - - // First check this chunk is erased... -#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK - writeOk = yaffs_CheckChunkErased(dev,chunk); -#endif - if(!writeOk) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk)); - } - else - { - writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare); - } - attempts++; - if(writeOk) - { - // Readback & verify - // If verify fails, then delete this chunk and try again - // To verify we compare everything except the block and - // page status bytes. - // NB We check a raw read without ECC correction applied - yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0); - -#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY - if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare)) - { - // Didn't verify - T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk)); - - writeOk = 0; - } -#endif - - } - if(writeOk) - { - // Copy the data into the write buffer. - // NB We do this at the end to prevent duplicates in the case of a write error. - //Todo - yaffs_HandleWriteChunkOk(dev,chunk,data,spare); - } - else - { - yaffs_HandleWriteChunkError(dev,chunk); - } - } - - } while(chunk >= 0 && ! writeOk); - - if(attempts > 1) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts)); - dev->nRetriedWrites+= (attempts - 1); - } - - return chunk; -} - -/// -// Functions for robustisizing -// -// - -static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND) -{ - // Ding the blockStatus in the first two pages of the block. - - yaffs_Spare spare; - - memset(&spare, 0xff,sizeof(yaffs_Spare)); - - spare.blockStatus = 0; - - yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK, NULL , &spare); - yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK + 1, NULL , &spare); - - yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD; - dev->nRetiredBlocks++; -} - - - -static int yaffs_RewriteBufferedBlock(yaffs_Device *dev) -{ - dev->doingBufferedBlockRewrite = 1; - // - // Remove erased chunks - // Rewrite existing chunks to a new block - // Set current write block to the new block - - dev->doingBufferedBlockRewrite = 0; - - return 1; -} - - -static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND) -{ - int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK; - - // Mark the block for retirement - yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1; - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND)); - - - //TODO - // Just do a garbage collection on the affected block then retire the block - // NB recursion -} - - -static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND) -{ -} - -static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare) -{ -} - -static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare) -{ -} - -static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND) -{ - int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK; - - // Mark the block for retirement - yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1; - // Delete the chunk - yaffs_DeleteChunk(dev,chunkInNAND); -} - - - - -static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1) -{ - - - if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 || - s0->tagByte0 != s1->tagByte0 || - s0->tagByte1 != s1->tagByte1 || - s0->tagByte2 != s1->tagByte2 || - s0->tagByte3 != s1->tagByte3 || - s0->tagByte4 != s1->tagByte4 || - s0->tagByte5 != s1->tagByte5 || - s0->tagByte6 != s1->tagByte6 || - s0->tagByte7 != s1->tagByte7 || - s0->ecc1[0] != s1->ecc1[0] || - s0->ecc1[1] != s1->ecc1[1] || - s0->ecc1[2] != s1->ecc1[2] || - s0->ecc2[0] != s1->ecc2[0] || - s0->ecc2[1] != s1->ecc2[1] || - s0->ecc2[2] != s1->ecc2[2] ) - { - return 0; - } - - return 1; -} - - -///////////////////////// Object management ////////////////// -// List of spare objects -// The list is hooked together using the first pointer -// in the object - -// static yaffs_Object *yaffs_freeObjects = NULL; - -// static int yaffs_nFreeObjects; - -// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL; - -// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS]; - - -static __u16 yaffs_CalcNameSum(const char *name) -{ - __u16 sum = 0; - __u16 i = 1; - - __u8 *bname = (__u8 *)name; - if(bname) - { - while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH)) - { -#ifdef CONFIG_YAFFS_WINCE - sum += toupper(*bname) * i; -#else - sum += (*bname) * i; -#endif - i++; - bname++; - } - } - return sum; -} - -void yaffs_SetObjectName(yaffs_Object *obj, const char *name) -{ -#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM - if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH) - { - strcpy(obj->shortName,name); - } - else - { - obj->shortName[0]='\0'; - } -#endif - obj->sum = yaffs_CalcNameSum(name); -} - -void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare) -{ - nand_calculate_ecc (data , spare->ecc1); - nand_calculate_ecc (&data[256] , spare->ecc2); -} - -void yaffs_CalcTagsECC(yaffs_Tags *tags) -{ - // Calculate an ecc - - unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; - unsigned i,j; - unsigned ecc = 0; - unsigned bit = 0; - - tags->ecc = 0; - - for(i = 0; i < 8; i++) - { - for(j = 1; j &0xff; j<<=1) - { - bit++; - if(b[i] & j) - { - ecc ^= bit; - } - } - } - - tags->ecc = ecc; - - -} - -int yaffs_CheckECCOnTags(yaffs_Tags *tags) -{ - unsigned ecc = tags->ecc; - - yaffs_CalcTagsECC(tags); - - ecc ^= tags->ecc; - - if(ecc && ecc <= 64) - { - // TODO: Handle the failure better. Retire? - unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; - - ecc--; - - b[ecc / 8] ^= (1 << (ecc & 7)); - - // Now recvalc the ecc - yaffs_CalcTagsECC(tags); - - return 1; // recovered error - } - else if(ecc) - { - // Wierd ecc failure value - // TODO Need to do somethiong here - return -1; //unrecovered error - } - - return 0; -} - - -///////////////////////// TNODES /////////////////////// - -// List of spare tnodes -// The list is hooked together using the first pointer -// in the tnode. - -//static yaffs_Tnode *yaffs_freeTnodes = NULL; - -// static int yaffs_nFreeTnodes; - -//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL; - - - -// yaffs_CreateTnodes creates a bunch more tnodes and -// adds them to the tnode free list. -// Don't use this function directly - -static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes) -{ - int i; - yaffs_Tnode *newTnodes; - yaffs_TnodeList *tnl; - - if(nTnodes < 1) return YAFFS_OK; - - // make these things - - newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode)); - - if (!newTnodes) - { - T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR))); - return YAFFS_FAIL; - } - - // Hook them into the free list - for(i = 0; i < nTnodes - 1; i++) - { - newTnodes[i].internal[0] = &newTnodes[i+1]; - } - - newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; - dev->freeTnodes = newTnodes; - dev->nFreeTnodes+= nTnodes; - dev->nTnodesCreated += nTnodes; - - // Now add this bunch of tnodes to a list for freeing up. - // NB If we can't add this to the management list it isn't fatal - // but it just means we can't free this bunch of tnodes later. - tnl = YMALLOC(sizeof(yaffs_TnodeList)); - if(!tnl) - { - T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR))); - - } - else - { - tnl->tnodes = newTnodes; - tnl->next = dev->allocatedTnodeList; - dev->allocatedTnodeList = tnl; - } - - - T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR))); - - - return YAFFS_OK; -} - - -// GetTnode gets us a clean tnode. Tries to make allocate more if we run out -static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) -{ - yaffs_Tnode *tn = NULL; - - // If there are none left make more - if(!dev->freeTnodes) - { - yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES); - } - - if(dev->freeTnodes) - { - tn = dev->freeTnodes; - dev->freeTnodes = dev->freeTnodes->internal[0]; - dev->nFreeTnodes--; - // zero out - memset(tn,0,sizeof(yaffs_Tnode)); - } - - - return tn; -} - - -// FreeTnode frees up a tnode and puts it back on the free list -static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn) -{ - tn->internal[0] = dev->freeTnodes; - dev->freeTnodes = tn; - dev->nFreeTnodes++; -} - - -static void yaffs_DeinitialiseTnodes(yaffs_Device*dev) -{ - // Free the list of allocated tnodes - - while(dev->allocatedTnodeList) - { - YFREE(dev->allocatedTnodeList->tnodes); - dev->allocatedTnodeList = dev->allocatedTnodeList->next; - } - - dev->freeTnodes = NULL; - dev->nFreeTnodes = 0; -} - -static void yaffs_InitialiseTnodes(yaffs_Device*dev) -{ - dev->allocatedTnodeList = NULL; - dev->freeTnodes = NULL; - dev->nFreeTnodes = 0; - dev->nTnodesCreated = 0; - -} - -#if 0 -void yaffs_TnodeTest(yaffs_Device *dev) -{ - - int i; - int j; - yaffs_Tnode *tn[1000]; - - YINFO("Testing TNodes"); - - for(j = 0; j < 50; j++) - { - for(i = 0; i < 1000; i++) - { - tn[i] = yaffs_GetTnode(dev); - if(!tn[i]) - { - YALERT("Getting tnode failed"); - } - } - for(i = 0; i < 1000; i+=3) - { - yaffs_FreeTnode(dev,tn[i]); - tn[i] = NULL; - } - - } -} -#endif - - -////////////////// END OF TNODE MANIPULATION /////////////////////////// - -/////////////// Functions to manipulate the look-up tree (made up of tnodes) -// The look up tree is represented by the top tnode and the number of topLevel -// in the tree. 0 means only the level 0 tnode is in the tree. - - -// FindLevel0Tnode finds the level 0 tnode, if one exists. -// Used when reading..... -static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId) -{ - - yaffs_Tnode *tn = fStruct->top; - __u32 i; - int requiredTallness; - int level = fStruct->topLevel; - - // Check sane level and chunk Id - if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL) - { -// char str[50]; -// sprintf(str,"Bad level %d",level); -// YALERT(str); - return NULL; - } - - if(chunkId > YAFFS_MAX_CHUNK_ID) - { -// char str[50]; -// sprintf(str,"Bad chunkId %d",chunkId); -// YALERT(str); - return NULL; - } - - // First check we're tall enough (ie enough topLevel) - - i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); - requiredTallness = 0; - while(i) - { - i >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - - if(requiredTallness > fStruct->topLevel) - { - // Not tall enough, so we can't find it, return NULL. - return NULL; - } - - - // Traverse down to level 0 - while (level > 0 && tn) - { - tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK]; - level--; - - } - - return tn; -} - -// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. -// This happens in two steps: -// 1. If the tree isn't tall enough, then make it taller. -// 2. Scan down the tree towards the level 0 tnode adding tnodes if required. -// -// Used when modifying the tree. -// -static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId) -{ - - yaffs_Tnode *tn; - - int requiredTallness; - int i; - int l; - - __u32 x; - - - //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId)); - - // Check sane level and page Id - if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) - { -// char str[50]; -// sprintf(str,"Bad level %d",fStruct->topLevel); -// YALERT(str); - return NULL; - } - - if(chunkId > YAFFS_MAX_CHUNK_ID) - { -// char str[50]; -// sprintf(str,"Bad chunkId %d",chunkId); -// YALERT(str); - return NULL; - } - - // First check we're tall enough (ie enough topLevel) - - x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); - requiredTallness = 0; - while(x) - { - x >>= YAFFS_TNODES_INTERNAL_BITS; - requiredTallness++; - } - - //T((TSTR(" required=%d"),requiredTallness)); - - - if(requiredTallness > fStruct->topLevel) - { - // Not tall enough,gotta make the tree taller - for(i = fStruct->topLevel; i < requiredTallness; i++) - { - //T((TSTR(" add new top"))); - - tn = yaffs_GetTnode(dev); - - if(tn) - { - tn->internal[0] = fStruct->top; - fStruct->top = tn; - } - else - { - T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR))); - } - } - - fStruct->topLevel = requiredTallness; - } - - - // Traverse down to level 0, adding anything we need - - l = fStruct->topLevel; - tn = fStruct->top; - while (l > 0 && tn) - { - x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) & - YAFFS_TNODES_INTERNAL_MASK; - - //T((TSTR(" [%d:%d]"),l,i)); - - if(!tn->internal[x]) - { - //T((TSTR(" added"))); - - tn->internal[x] = yaffs_GetTnode(dev); - } - - tn = tn->internal[x]; - l--; - - } - - //TSTR(TENDSTR))); - - return tn; -} - -// DeleteWorker scans backwards through the tnode tree and deletes all the -// chunks and tnodes in the file -// Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete. - -static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit) -{ - int i; - int chunkInInode; - int theChunk; - yaffs_Tags tags; - int found; - int chunkDeleted; - int allDone = 1; - - - if(tn) - { - if(level > 0) - { - - for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--) - { - if(tn->internal[i]) - { - if(limit && (*limit) < 0) - { - allDone = 0; - } - else - { - allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1, - (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit); - } - if(allDone) - { - yaffs_FreeTnode(in->myDev,tn->internal[i]); - tn->internal[i] = NULL; - } - } - - } - return (allDone) ? 1 : 0; - } - else if(level == 0) - { - for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) //NB Don't apply the limit here, always delete a whole level0 - { - if(tn->level0[i]) - { - int j; - - chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i; - - theChunk = tn->level0[i] << in->myDev->chunkGroupBits; - - // Now we need to search for it - for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++) - { - yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted); - if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted)) - { - // found it; - found = 1; - - } - else - { - theChunk++; - } - } - - if(found) - { - yaffs_DeleteChunk(in->myDev,theChunk); - in->nDataChunks--; - if(limit) - { - *limit = *limit-1; - } - - } - - tn->level0[i] = 0; - } - - } - return 1; - - - } - - } - - return 1; - -} - - - - -// Pruning removes any part of the file structure tree that is beyond the -// bounds of the file (ie that does not point to chunks). -// -// A file should only get pruned when its size is reduced. -// -// Before pruning, the chunks must be pulled from the tree and the -// level 0 tnode entries must be zeroed out. -// Could also use this for file deletion, but that's probably better handled -// by a special case. - -// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure() - -static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0) -{ - int i; - int hasData; - - if(tn) - { - hasData = 0; - - for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++) - { - if(tn->internal[i] && level > 0) - { - tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1); - } - - if(tn->internal[i]) - { - hasData++; - } - } - - if(hasData == 0 && del0) - { - // Free and return NULL - - yaffs_FreeTnode(dev,tn); - tn = NULL; - } - - } - - return tn; - -} - -static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct) -{ - int i; - int hasData; - int done = 0; - yaffs_Tnode *tn; - - if(fStruct->topLevel > 0) - { - fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0); - - // Now we have a tree with all the non-zero branches NULL but the height - // is the same as it was. - // Let's see if we can trim internal tnodes to shorten the tree. - // We can do this if only the 0th element in the tnode is in use - // (ie all the non-zero are NULL) - - while(fStruct->topLevel && !done) - { - tn = fStruct->top; - - hasData = 0; - for(i = 1; i internal[i]) - { - hasData++; - } - } - - if(!hasData) - { - fStruct->top = tn->internal[0]; - fStruct->topLevel--; - yaffs_FreeTnode(dev,tn); - } - else - { - done = 1; - } - } - } - - return YAFFS_OK; -} - - - - - -/////////////////////// End of File Structure functions. ///////////////// - -// yaffs_CreateFreeObjects creates a bunch more objects and -// adds them to the object free list. -static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects) -{ - int i; - yaffs_Object *newObjects; - yaffs_ObjectList *list; - - if(nObjects < 1) return YAFFS_OK; - - // make these things - - newObjects = YMALLOC(nObjects * sizeof(yaffs_Object)); - - if (!newObjects) - { - T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR))); - return YAFFS_FAIL; - } - - // Hook them into the free list - for(i = 0; i < nObjects - 1; i++) - { - (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1]; - } - - newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects; - dev->freeObjects = newObjects; - dev->nFreeObjects+= nObjects; - dev->nObjectsCreated+= nObjects; - - // Now add this bunch of Objects to a list for freeing up. - - list = YMALLOC(sizeof(yaffs_ObjectList)); - if(!list) - { - T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR))); - } - else - { - list->objects = newObjects; - list->next = dev->allocatedObjectList; - dev->allocatedObjectList = list; - } - - - - return YAFFS_OK; -} - - -// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out -static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) -{ - yaffs_Object *tn = NULL; - - // If there are none left make more - if(!dev->freeObjects) - { - yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS); - } - - if(dev->freeObjects) - { - tn = dev->freeObjects; - dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next); - dev->nFreeObjects--; - - // Now sweeten it up... - - memset(tn,0,sizeof(yaffs_Object)); - tn->myDev = dev; - tn->chunkId = -1; - tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; - INIT_LIST_HEAD(&(tn->hardLinks)); - INIT_LIST_HEAD(&(tn->hashLink)); - INIT_LIST_HEAD(&tn->siblings); - - // Add it to the lost and found directory. - // NB Can't put root or lostNFound in lostNFound so - // check if lostNFound exists first - if(dev->lostNFoundDir) - { - yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn); - } - } - - - return tn; -} - -static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode) -{ - - yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY); - if(obj) - { - obj->fake = 1; // it is fake so it has no NAND presence... - obj->renameAllowed= 0; // ... and we're not allowed to rename it... - obj->unlinkAllowed= 0; // ... or unlink it - obj->deleted = 0; - obj->unlinked = 0; - obj->st_mode = mode; - obj->myDev = dev; - obj->chunkId = 0; // Not a valid chunk. - } - - return obj; - -} - - -static void yaffs_UnhashObject(yaffs_Object *tn) -{ - int bucket; - yaffs_Device *dev = tn->myDev; - - - // If it is still linked into the bucket list, free from the list - if(!list_empty(&tn->hashLink)) - { - list_del_init(&tn->hashLink); - bucket = yaffs_HashFunction(tn->objectId); - dev->objectBucket[bucket].count--; - } - -} - - -// FreeObject frees up a Object and puts it back on the free list -static void yaffs_FreeObject(yaffs_Object *tn) -{ - - yaffs_Device *dev = tn->myDev; - - yaffs_UnhashObject(tn); - - // Link into the free list. - (yaffs_Object *)(tn->siblings.next) = dev->freeObjects; - dev->freeObjects = tn; - dev->nFreeObjects++; -} - - - - -static void yaffs_DeinitialiseObjects(yaffs_Device *dev) -{ - // Free the list of allocated Objects - - while( dev->allocatedObjectList) - { - YFREE(dev->allocatedObjectList->objects); - dev->allocatedObjectList = dev->allocatedObjectList->next; - } - - dev->freeObjects = NULL; - dev->nFreeObjects = 0; -} - -static void yaffs_InitialiseObjects(yaffs_Device *dev) -{ - int i; - - dev->allocatedObjectList = NULL; - dev->freeObjects = NULL; - dev->nFreeObjects = 0; - - for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) - { - INIT_LIST_HEAD(&dev->objectBucket[i].list); - dev->objectBucket[i].count = 0; - } - -} - - - - - - -int yaffs_FindNiceObjectBucket(yaffs_Device *dev) -{ - static int x = 0; - int i; - int l = 999; - int lowest = 999999; - - - // First let's see if we can find one that's empty. - - for(i = 0; i < 10 && lowest > 0; i++) - { - x++; - x %= YAFFS_NOBJECT_BUCKETS; - if(dev->objectBucket[x].count < lowest) - { - lowest = dev->objectBucket[x].count; - l = x; - } - - } - - // If we didn't find an empty list, then try - // looking a bit further for a short one - - for(i = 0; i < 10 && lowest > 3; i++) - { - x++; - x %= YAFFS_NOBJECT_BUCKETS; - if(dev->objectBucket[x].count < lowest) - { - lowest = dev->objectBucket[x].count; - l = x; - } - - } - - return l; -} - -static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) -{ - int bucket = yaffs_FindNiceObjectBucket(dev); - - // Now find an object value that has not already been taken - // by scanning the list. - - int found = 0; - struct list_head *i; - - __u32 n = (__u32)bucket; - - //yaffs_CheckObjectHashSanity(); - - while(!found) - { - found = 1; - n += YAFFS_NOBJECT_BUCKETS; - if(1 ||dev->objectBucket[bucket].count > 0) - { - list_for_each(i,&dev->objectBucket[bucket].list) - { - // If there is already one in the list - if(list_entry(i, yaffs_Object,hashLink)->objectId == n) - { - found = 0; - } - } - } - } - - //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n); - - return n; -} - -void yaffs_HashObject(yaffs_Object *in) -{ - int bucket = yaffs_HashFunction(in->objectId); - yaffs_Device *dev = in->myDev; - - if(!list_empty(&in->hashLink)) - { - //YINFO("!!!"); - } - - - list_add(&in->hashLink,&dev->objectBucket[bucket].list); - dev->objectBucket[bucket].count++; - -} - -yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number) -{ - int bucket = yaffs_HashFunction(number); - struct list_head *i; - yaffs_Object *in; - - list_for_each(i,&dev->objectBucket[bucket].list) - { - // Look if it is in the list - in = list_entry(i, yaffs_Object,hashLink); - if(in->objectId == number) - { - return in; - } - } - - return NULL; -} - - - -yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type) -{ - - yaffs_Object *theObject; - - if(number < 0) - { - number = yaffs_CreateNewObjectNumber(dev); - } - - theObject = yaffs_AllocateEmptyObject(dev); - - if(theObject) - { - theObject->fake = 0; - theObject->renameAllowed = 1; - theObject->unlinkAllowed = 1; - theObject->objectId = number; - yaffs_HashObject(theObject); - theObject->variantType = type; -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(theObject->win_atime); - theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0]; - theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1]; - -#else - theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME; -#endif - switch(type) - { - case YAFFS_OBJECT_TYPE_FILE: - theObject->variant.fileVariant.fileSize = 0; - theObject->variant.fileVariant.scannedFileSize = 0; - theObject->variant.fileVariant.topLevel = 0; - theObject->variant.fileVariant.top = yaffs_GetTnode(dev); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - INIT_LIST_HEAD(&theObject->variant.directoryVariant.children); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - // No action required - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - // No action required - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - // No action required - break; - case YAFFS_OBJECT_TYPE_UNKNOWN: - // todo this should not happen - break; - } - } - - return theObject; -} - -yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type) -{ - yaffs_Object *theObject = NULL; - - if(number > 0) - { - theObject = yaffs_FindObjectByNumber(dev,number); - } - - if(!theObject) - { - theObject = yaffs_CreateNewObject(dev,number,type); - } - - return theObject; - -} - -char *yaffs_CloneString(const char *str) -{ - char *newStr = NULL; - - if(str && *str) - { - newStr = YMALLOC(strlen(str) + 1); - strcpy(newStr,str); - } - - return newStr; - -} - -// -// Mknod (create) a new object. -// equivalentObject only has meaning for a hard link; -// aliasString only has meaning for a sumlink. -// rdev only has meaning for devices (a subset of special objects) -yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type, - yaffs_Object *parent, - const char *name, - __u32 mode, - __u32 uid, - __u32 gid, - yaffs_Object *equivalentObject, - const char *aliasString, - __u32 rdev) -{ - yaffs_Object *in; - - yaffs_Device *dev = parent->myDev; - - // Check if the entry exists. If it does then fail the call since we don't want a dup. - if(yaffs_FindObjectByName(parent,name)) - { - return NULL; - } - - in = yaffs_CreateNewObject(dev,-1,type); - - if(in) - { - in->chunkId = -1; - in->valid = 1; - in->variantType = type; - - in->st_mode = mode; - -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(in->win_atime); - in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0]; - in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0]; - -#else - in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME; - in->st_rdev = rdev; - in->st_uid = uid; - in->st_gid = gid; -#endif - in->nDataChunks = 0; - - yaffs_SetObjectName(in,name); - in->dirty = 1; - - yaffs_AddObjectToDirectory(parent,in); - - in->myDev = parent->myDev; - - - switch(type) - { - case YAFFS_OBJECT_TYPE_SYMLINK: - in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant.equivalentObject = equivalentObject; - in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId; - list_add(&in->hardLinks,&equivalentObject->hardLinks); - break; - case YAFFS_OBJECT_TYPE_FILE: // do nothing - case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing - case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing - case YAFFS_OBJECT_TYPE_UNKNOWN: - break; - } - - if(yaffs_GetNumberOfFreeChunks(dev) <= 0 || - yaffs_UpdateObjectHeader(in,name,0) < 0) - { - // Could not create the object header, fail the creation - yaffs_UnlinkWorker(in); - in = NULL; - } - - } - - return in; -} - -yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0); -} - -yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0); -} - -yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev); -} - -yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias) -{ - return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0); -} - -// NB yaffs_Link returns the object id of the equivalent object. -yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject) -{ - // Get the real object in case we were fed a hard link as an equivalent object - equivalentObject = yaffs_GetEquivalentObject(equivalentObject); - - if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0)) - { - return equivalentObject; - } - else - { - return NULL; - } - -} - - -static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force) -{ - int unlinkOp; - - if(newDir == NULL) - { - newDir = obj->parent; // use the old directory - } - - unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE); - - // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since - // duplicate names are allowed. - // Otherwise only proceed if the new name does not exist and if we're putting it into a directory. - if( (unlinkOp|| - force || - !yaffs_FindObjectByName(newDir,newName)) && - newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) - { - yaffs_SetObjectName(obj,newName); - obj->dirty = 1; - - yaffs_AddObjectToDirectory(newDir,obj); - - if(unlinkOp) obj->unlinked = 1; - - - if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0) - { - return YAFFS_OK; - } - } - - return YAFFS_FAIL; -} - - - -int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName) -{ - yaffs_Object *obj; - int force = 0; - -#ifdef CONFIG_YAFFS_WINCE - // Special case for WinCE. - // While look-up is case insensitive, the name isn't. - // THerefore we might want to change x.txt to X.txt - if(oldDir == newDir && _stricmp(oldName,newName) == 0) - { - force = 1; - } -#endif - - obj = yaffs_FindObjectByName(oldDir,oldName); - if(obj && obj->renameAllowed) - { - return yaffs_ChangeObjectName(obj,newDir,newName,force); - } - return YAFFS_FAIL; -} - - - -static int yaffs_CheckObjectHashSanity(yaffs_Device *dev) -{ - // Scan the buckets and check that the lists - // have as many members as the count says there are - int bucket; - int countEm; - struct list_head *j; - int ok = YAFFS_OK; - - for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++) - { - countEm = 0; - - list_for_each(j,&dev->objectBucket[bucket].list) - { - countEm++; - } - - if(countEm != dev->objectBucket[bucket].count) - { - T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR))); - ok = YAFFS_FAIL; - } - } - - return ok; -} - -#if 0 -void yaffs_ObjectTest(yaffs_Device *dev) -{ - yaffs_Object *in[1000]; - int inNo[1000]; - yaffs_Object *inold[1000]; - int i; - int j; - - memset(in,0,1000*sizeof(yaffs_Object *)); - memset(inold,0,1000*sizeof(yaffs_Object *)); - - yaffs_CheckObjectHashSanity(dev); - - for(j = 0; j < 10; j++) - { - //T(("%d\n",j)); - - for(i = 0; i < 1000; i++) - { - in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE); - if(!in[i]) - { - YINFO("No more inodes"); - } - else - { - inNo[i] = in[i]->objectId; - } - } - - for(i = 0; i < 1000; i++) - { - if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i]) - { - //T(("Differnce in look up test\n")); - } - else - { - // T(("Look up ok\n")); - } - } - - yaffs_CheckObjectHashSanity(dev); - - for(i = 0; i < 1000; i+=3) - { - yaffs_FreeObject(in[i]); - in[i] = NULL; - } - - - yaffs_CheckObjectHashSanity(dev); - } - -} - -#endif - -/////////////////////////// Block Management and Page Allocation /////////////////// - - -static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks) -{ - dev->allocationBlock = -1; // force it to get a new one - //Todo we're assuming the malloc will pass. - dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo)); - if(dev->blockInfo) - { - memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo)); - return YAFFS_OK; - } - return YAFFS_FAIL; - -} - -static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) -{ - YFREE(dev->blockInfo); -} - -// FindDiretiestBlock is used to select the dirtiest block (or close enough) -// for garbage collection. - -static int yaffs_FindDirtiestBlock(yaffs_Device *dev) -{ - - int b = dev->currentDirtyChecker; - - int i; - int dirtiest = -1; - int pagesInUse = 100; // silly big number - yaffs_BlockInfo *bi; - - for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++) - { - b++; - if ( b < dev->startBlock || b > dev->endBlock) - { - b = dev->startBlock; - } - - if(b < dev->startBlock || b > dev->endBlock) - { - T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b)); - YBUG(); - } - - bi = yaffs_GetBlockInfo(dev,b); - - if(bi->blockState == YAFFS_BLOCK_STATE_FULL && - bi->pagesInUse < pagesInUse) - { - dirtiest = b; - pagesInUse = bi->pagesInUse; - } - } - - dev->currentDirtyChecker = b; - - return dirtiest; -} - - -static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo) -{ - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo); - - int erasedOk = 0; - - // If the block is still healthy erase it and mark as clean. - // If the block has had a data failure, then retire it. - bi->blockState = YAFFS_BLOCK_STATE_DIRTY; - - if(!bi->needsRetiring) - { - erasedOk = yaffs_EraseBlockInNAND(dev,blockNo); - if(!erasedOk) - { - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo)); - } - } - - if( erasedOk ) - { - bi->blockState = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - bi->pagesInUse = 0; - bi->pageBits = 0; - - T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo)); - } - else - { - yaffs_RetireBlock(dev,blockNo); - T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo)); - } -} - - -static int yaffs_FindBlockForAllocation(yaffs_Device *dev) -{ - int i; - yaffs_BlockInfo *bi; - - if(dev->nErasedBlocks < 1) - { - // Hoosterman we've got a problem. - // Can't get space to gc - T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during gc" TENDSTR))); - - return -1; - } - - // Find an empty block. - - for(i = dev->startBlock; i <= dev->endBlock; i++) - { - bi = yaffs_GetBlockInfo(dev,i); - if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY) - { - bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING; - dev->nErasedBlocks--; - return i; - } - } - - return -1; -} - - - -static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve) -{ - int retVal; - yaffs_BlockInfo *bi; - - if(dev->allocationBlock < 0) - { - // Get next block to allocate off - dev->allocationBlock = yaffs_FindBlockForAllocation(dev); - dev->allocationPage = 0; - } - - if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) - { - // Not enough space to allocate unless we're allowed to use the reserve. - return -1; - } - - // Next page please.... - if(dev->allocationBlock >= 0) - { - bi = yaffs_GetBlockInfo(dev,dev->allocationBlock); - - retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + - dev->allocationPage; - bi->pagesInUse++; - bi->pageBits |= (1 << (dev->allocationPage)); - - dev->allocationPage++; - - dev->nFreeChunks--; - - // If the block is full set the state to full - if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK) - { - bi->blockState = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } - - - return retVal; - - } - T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); - - return -1; -} - -// To determine if we have enough space we just look at the -// number of erased blocks. -// The cache is allowed to use reserved blocks. - -int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev) -{ - return (dev->nErasedBlocks >= YAFFS_RESERVED_BLOCKS); -} - - -int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block) -{ - int oldChunk; - int newChunk; - __u32 mask; - - - yaffs_Spare spare; - yaffs_Tags tags; - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - - yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block); - - yaffs_Object *object; - - //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits)); - - for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK; - mask && bi->pageBits; - mask <<= 1, oldChunk++ ) - { - if(bi->pageBits & mask) - { - - // This page is in use and needs to be copied off - - dev->nGCCopies++; - - //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk)); - - yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1); - - yaffs_GetTagsFromSpare(dev,&spare,&tags); - - object = yaffs_FindObjectByNumber(dev,tags.objectId); - - if(object && object->deleted && tags.chunkId != 0) - { - // Data chunk in a deleted file, throw it away - // It's a deleted data chunk, - // No need to copy this, just forget about it and fix up the - // object. - - yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0); - object->nDataChunks--; - } - else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */) - { - // Deleted object header with no data chunks. - // Can be discarded - object->chunkId = 0; - //Todo some clean up - - } - else if(object) - { - // It's either a data chunk in a live file or - // an ObjectHeader, so we're interested in it. - // NB Need to keep the ObjectHeaders of deleted files - // until the whole file has been deleted off - tags.serialNumber++; - yaffs_LoadTagsIntoSpare(&spare,&tags); - - - newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1); - - if(newChunk < 0) - { - return YAFFS_FAIL; - } - - // Ok, now fix up the Tnodes etc. - - if(tags.chunkId == 0) - { - // It's a header - object->chunkId = newChunk; - } - else - { - // It's a data chunk - yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0); - } - } - - yaffs_DeleteChunk(dev,oldChunk); - - } - } - - return YAFFS_OK; -} - - -static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev) -{ - // todo find a file to delete - struct list_head *i; - yaffs_Object *l; - - - // To the free chunks add the chunks that are in the deleted unlinked files. - list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - if(l->deleted) - { - return l; - } - } - return NULL; -} - -static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev) -{ - // This does background deletion on unlinked files.. only deleted ones. - // If we don't have a file we're working on then find one - if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0) - { - dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev); - } - - // OK, we're working on a file... - if(dev->unlinkedDeletion) - { - yaffs_Object *obj = dev->unlinkedDeletion; - int delresult; - int limit; // Number of chunks to delete in a file. - // NB this can be exceeded, but not by much. - - limit = 5; -#if 0 - if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER)) - { - limit = 50; // Doing GC soon, so dig deeper - } - else - { - limit = 5; - } -#endif - - delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit); - - if(obj->nDataChunks == 0) - { - // Done all the deleting of data chunks. - // Now dump the header and clean up - yaffs_FreeTnode(dev,obj->variant.fileVariant.top); - yaffs_DoGenericObjectDeletion(obj); - dev->nDeletedFiles--; - dev->nUnlinkedFiles--; - dev->nBackgroundDeletions++; - dev->unlinkedDeletion = NULL; - } - } -} - - - -static int yaffs_CheckGarbageCollection(yaffs_Device *dev) -{ - int block; - - yaffs_DoUnlinkedFileDeletion(dev); - - if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER)) - { - dev->garbageCollectionRequired = 1; - } - - if(dev->garbageCollectionRequired) - { - dev->garbageCollections++; - dev->garbageCollectionRequired = 0; - if(dev->blockSelectedForGC >= 0) - { - block = dev->blockSelectedForGC; - } - else - { - block = yaffs_FindDirtiestBlock(dev); - } - - if(block >= 0) - { - return yaffs_GarbageCollectBlock(dev,block); - } - else - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; -} - - -//////////////////////////// TAGS /////////////////////////////////////// - -static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr) -{ - yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; - - yaffs_CalcTagsECC(tagsPtr); - - sparePtr->tagByte0 = tu->asBytes[0]; - sparePtr->tagByte1 = tu->asBytes[1]; - sparePtr->tagByte2 = tu->asBytes[2]; - sparePtr->tagByte3 = tu->asBytes[3]; - sparePtr->tagByte4 = tu->asBytes[4]; - sparePtr->tagByte5 = tu->asBytes[5]; - sparePtr->tagByte6 = tu->asBytes[6]; - sparePtr->tagByte7 = tu->asBytes[7]; -} - -static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr) -{ - yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; - int result; - - tu->asBytes[0]= sparePtr->tagByte0; - tu->asBytes[1]= sparePtr->tagByte1; - tu->asBytes[2]= sparePtr->tagByte2; - tu->asBytes[3]= sparePtr->tagByte3; - tu->asBytes[4]= sparePtr->tagByte4; - tu->asBytes[5]= sparePtr->tagByte5; - tu->asBytes[6]= sparePtr->tagByte6; - tu->asBytes[7]= sparePtr->tagByte7; - - result = yaffs_CheckECCOnTags(tagsPtr); - if(result> 0) - { - dev->tagsEccFixed++; - } - else if(result <0) - { - dev->tagsEccUnfixed++; - } -} - -static void yaffs_SpareInitialise(yaffs_Spare *spare) -{ - memset(spare,0xFF,sizeof(yaffs_Spare)); -} - -static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted) -{ - if(tags) - { - yaffs_Spare spare; - if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK) - { - *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0; - yaffs_GetTagsFromSpare(dev,&spare,tags); - return YAFFS_OK; - } - else - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; -} - -#if 0 -static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags) -{ - // NB There must be tags, data is optional - // If there is data, then an ECC is calculated on it. - - yaffs_Spare spare; - - if(!tags) - { - return YAFFS_FAIL; - } - - yaffs_SpareInitialise(&spare); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - yaffs_LoadTagsIntoSpare(&spare,tags); - - return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare); - -} -#endif - - -static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve) -{ - // NB There must be tags, data is optional - // If there is data, then an ECC is calculated on it. - - yaffs_Spare spare; - - if(!tags) - { - return YAFFS_FAIL; - } - - yaffs_SpareInitialise(&spare); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - yaffs_LoadTagsIntoSpare(&spare,tags); - - return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve); - -} - -static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted) -{ - return ( tags->chunkId == chunkInObject && - tags->objectId == objectId && - !chunkDeleted) ? 1 : 0; - -} - - - -int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) -{ - //Get the Tnode, then get the level 0 offset chunk offset - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_Tags localTags; - int i; - int found = 0; - int chunkDeleted; - - yaffs_Device *dev = in->myDev; - - - if(!tags) - { - // Passed a NULL, so use our own tags space - tags = &localTags; - } - - tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - - if(tn) - { - theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; - - // Now we need to do the shifting etc and search for it - for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) - { - yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); - if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) - { - // found it; - found = 1; - } - else - { - theChunk++; - } - } - } - return found ? theChunk : -1; -} - -int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) -{ - //Get the Tnode, then get the level 0 offset chunk offset - yaffs_Tnode *tn; - int theChunk = -1; - yaffs_Tags localTags; - int i; - int found = 0; - yaffs_Device *dev = in->myDev; - int chunkDeleted; - - if(!tags) - { - // Passed a NULL, so use our own tags space - tags = &localTags; - } - - tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - - if(tn) - { - - theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; - - // Now we need to do the shifting etc and search for it - for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) - { - yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); - if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) - { - // found it; - found = 1; - } - else - { - theChunk++; - } - } - - // Delete the entry in the filestructure - if(found) - { - tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0; - } - } - else - { - //T(("No level 0 found for %d\n", chunkInInode)); - } - - if(!found) - { - //T(("Could not find %d to delete\n",chunkInInode)); - } - return found ? theChunk : -1; -} - - -#ifdef YAFFS_PARANOID - -static int yaffs_CheckFileSanity(yaffs_Object *in) -{ - int chunk; - int nChunks; - int fSize; - int failed = 0; - int objId; - yaffs_Tnode *tn; - yaffs_Tags localTags; - yaffs_Tags *tags = &localTags; - int theChunk; - int chunkDeleted; - - - if(in->variantType != YAFFS_OBJECT_TYPE_FILE) - { - //T(("Object not a file\n")); - return YAFFS_FAIL; - } - - objId = in->objectId; - fSize = in->variant.fileVariant.fileSize; - nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK; - - for(chunk = 1; chunk <= nChunks; chunk++) - { - tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk); - - if(tn) - { - - theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits; - - - yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted); - if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted)) - { - // found it; - - } - else - { - //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n", - // objId,chunk,theChunk,tags->chunkId,tags->objectId); - - failed = 1; - - } - - } - else - { - //T(("No level 0 found for %d\n", chunk)); - } - } - - return failed ? YAFFS_FAIL : YAFFS_OK; -} - -#endif - -static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan) -{ - yaffs_Tnode *tn; - yaffs_Device *dev = in->myDev; - int existingChunk; - yaffs_Tags existingTags; - yaffs_Tags newTags; - unsigned existingSerial, newSerial; - - int newChunkDeleted; - - - tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); - if(!tn) - { - return YAFFS_FAIL; - } - - existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK]; - - if(inScan) - { - // If we're scanning then we need to test for duplicates - // NB This does not need to be efficient since it should only ever - // happen when the power fails during a write, then only one - // chunk should ever be affected. - - - if(existingChunk != 0) - { - // NB Right now existing chunk will not be real chunkId if the device >= 32MB - // thus we have to do a FindChunkInFile to get the real chunk id. - // - // We have a duplicate now we need to decide which one to use - // To do this we get both sets of tags and compare serial numbers. - yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted); - - - // Do a proper find - existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags); - - if(existingChunk <=0) - { - //Hoosterman - how did this happen? - - T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: existing chunk < 0 in scan" TENDSTR))); - - } - - - // NB The deleted flags should be false, otherwise the chunks will - // not be loaded during a scan - - newSerial = newTags.serialNumber; - existingSerial = existingTags.serialNumber; - - if( existingChunk <= 0 || - ((existingSerial+1) & 3) == newSerial) - { - // Use new - // Delete the old one and drop through to update the tnode - yaffs_DeleteChunk(dev,existingChunk); - } - else - { - // Use existing. - // Delete the new one and return early so that the tnode isn't changed - yaffs_DeleteChunk(dev,chunkInNAND); - return YAFFS_OK; - } - } - - } - - if(existingChunk == 0) - { - in->nDataChunks++; - } - - tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits); - - return YAFFS_OK; -} - - - -int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer) -{ - int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL); - - if(chunkInNAND >= 0) - { - return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1); - } - else - { - return 0; - } - -} - - -static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId) -{ - int block; - int page; - yaffs_Spare spare; - yaffs_BlockInfo *bi; - - if(chunkId <= 0) return; - - block = chunkId / YAFFS_CHUNKS_PER_BLOCK; - page = chunkId % YAFFS_CHUNKS_PER_BLOCK; - yaffs_SpareInitialise(&spare); - - spare.pageStatus = 0; // To mark it as deleted. - - - yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare); - yaffs_HandleUpdateChunk(dev,chunkId,&spare); - bi = yaffs_GetBlockInfo(dev,block); - - - // Pull out of the management area. - // If the whole block became dirty, this will kick off an erasure. - if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || - bi->blockState == YAFFS_BLOCK_STATE_FULL) - { - dev->nFreeChunks++; - - bi->pageBits &= ~(1 << page); - bi->pagesInUse--; - - if(bi->pagesInUse == 0 && - bi->blockState == YAFFS_BLOCK_STATE_FULL) - { - yaffs_BlockBecameDirty(dev,block); - } - - } - else - { - // T(("Bad news deleting chunk %d\n",chunkId)); - } - -} - - - - -int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve) -{ - // Find old chunk Need to do this to get serial number - // Write new one and patch into tree. - // Invalidate old tags. - - int prevChunkId; - yaffs_Tags prevTags; - - int newChunkId; - yaffs_Tags newTags; - - yaffs_Device *dev = in->myDev; - - yaffs_CheckGarbageCollection(dev); - - // Get the previous chunk at this location in the file if it exists - prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags); - - // Set up new tags - newTags.chunkId = chunkInInode; - newTags.objectId = in->objectId; - newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1; - newTags.byteCount = nBytes; - newTags.unusedStuff = 0xFFFFFFFF; - - yaffs_CalcTagsECC(&newTags); - - newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve); - if(newChunkId >= 0) - { - yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0); - - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - - } - - yaffs_CheckFileSanity(in); - } - return newChunkId; - - - - - -} - - -// UpdateObjectHeader updates the header on NAND for an object. -// If name is not NULL, then that new name is used. -// -int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force) -{ - - yaffs_Device *dev = in->myDev; - - int prevChunkId; - - int newChunkId; - yaffs_Tags newTags; - __u8 bufferNew[YAFFS_BYTES_PER_CHUNK]; - __u8 bufferOld[YAFFS_BYTES_PER_CHUNK]; - - yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew; - yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld; - - - if(!in->fake || force) - { - - yaffs_CheckGarbageCollection(dev); - - memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK); - - prevChunkId = in->chunkId; - - if(prevChunkId >= 0) - { - yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1); - } - - // Header data - oh->type = in->variantType; - - oh->st_mode = in->st_mode; - -#ifdef CONFIG_YAFFS_WINCE - oh->win_atime[0] = in->win_atime[0]; - oh->win_ctime[0] = in->win_ctime[0]; - oh->win_mtime[0] = in->win_mtime[0]; - oh->win_atime[1] = in->win_atime[1]; - oh->win_ctime[1] = in->win_ctime[1]; - oh->win_mtime[1] = in->win_mtime[1]; -#else - oh->st_uid = in->st_uid; - oh->st_gid = in->st_gid; - oh->st_atime = in->st_atime; - oh->st_mtime = in->st_mtime; - oh->st_ctime = in->st_ctime; - oh->st_rdev = in->st_rdev; -#endif - if(in->parent) - { - oh->parentObjectId = in->parent->objectId; - } - else - { - oh->parentObjectId = 0; - } - - //oh->sum = in->sum; - if(name && *name) - { - memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); - strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH); - } - else if(prevChunkId) - { - memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1); - } - else - { - memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); - } - - switch(in->variantType) - { - case YAFFS_OBJECT_TYPE_UNKNOWN: - // Should not happen - break; - case YAFFS_OBJECT_TYPE_FILE: - oh->fileSize = in->variant.fileVariant.fileSize; - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId; - break; - case YAFFS_OBJECT_TYPE_SPECIAL: - // Do nothing - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - // Do nothing - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH); - oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; - break; - } - - // Tags - in->serial++; - newTags.chunkId = 0; - newTags.objectId = in->objectId; - newTags.serialNumber = in->serial; - newTags.byteCount = 0xFFFFFFFF; - newTags.unusedStuff = 0xFFFFFFFF; - - yaffs_CalcTagsECC(&newTags); - - - // Create new chunk in NAND - newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1); - - if(newChunkId >= 0) - { - - in->chunkId = newChunkId; - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - } - - in->dirty = 0; - } - - return newChunkId; - - } - return 0; -} - - -/////////////////////// Short Operations Cache //////////////////////////////// -// In many siturations where there is no high level buffering (eg WinCE) a lot of -// reads might be short sequential reads, and a lot of writes may be short -// sequential writes. eg. scanning/writing a jpeg file. -// In these cases, a short read/write cache can provide a huge perfomance benefit -// with dumb-as-a-rock code. -// There are a limited number (~10) of cache chunks per device so that we don't -// need a very intelligent search. - - -#ifdef CONFIG_YAFFS_SHORT_OP_CACHE - - -static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) -{ - yaffs_Device *dev = obj->myDev; - int lowest; - int i; - yaffs_ChunkCache *cache; - int chunkWritten; - int nBytes; - - do{ - cache = NULL; - - // Find the dirty cache for this object with the lowest chunk id. - for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if(dev->srCache[i].object == obj && - dev->srCache[i].dirty) - { - if(!cache || dev->srCache[i].chunkId < lowest) - { - cache = &dev->srCache[i]; - lowest = cache->chunkId; - } - } - } - - if(cache) - { - //Write it out - - nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK); - - if(nBytes > YAFFS_BYTES_PER_CHUNK) - { - nBytes= YAFFS_BYTES_PER_CHUNK; - } - - chunkWritten = yaffs_WriteChunkDataToObject(cache->object, - cache->chunkId, - cache->data, - nBytes,1); - - cache->dirty = 0; - } - - } while(cache && chunkWritten > 0); - - if(cache) - { - //Hoosterman, disk full while writing cache out. - T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during caceh write" TENDSTR))); - - } - -} - - -// Grab us a chunk for use. -// First look for an empty one. -// Then look for the least recently used non-dirty one. -// Then look for the least recently used dirty one...., flush and look again. -static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev) -{ - int i; - int usage; - int theOne; - - for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if(!dev->srCache[i].object) - { - //T(("Grabbing empty %d\n",i)); - - return &dev->srCache[i]; - } - } - - theOne = -1; - usage = 0; // just to stop the compiler grizzling - - for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if(!dev->srCache[i].dirty && - ((dev->srCache[i].lastUse < usage && theOne >= 0)|| - theOne < 0)) - { - usage = dev->srCache[i].lastUse; - theOne = i; - } - } - - //T(("Grabbing non-empty %d\n",theOne)); - return theOne >= 0 ? &dev->srCache[theOne] : NULL; - -} - - -static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) -{ - yaffs_ChunkCache *cache; - yaffs_Object *theObj; - int usage; - int i; - - // Try find a non-dirty one... - - cache = yaffs_GrabChunkCacheWorker(dev); - - if(!cache) - { - // They were all dirty, find the last recently used object and flush - // its cache, then find again. - // NB what's here is not very accurate, we actually flush the object - // the last recently used page. - - theObj = dev->srCache[0].object; - usage = dev->srCache[0].lastUse; - - for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if( dev->srCache[i].object && - dev->srCache[i].lastUse < usage) - { - usage = dev->srCache[i].lastUse; - theObj = dev->srCache[i].object; - } - } - - yaffs_FlushFilesChunkCache(theObj); - - // Try again - cache = yaffs_GrabChunkCacheWorker(dev); - } - - return cache; - -} - - -// Find a cached chunk -static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId) -{ - yaffs_Device *dev = obj->myDev; - int i; - - for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if(dev->srCache[i].object == obj && - dev->srCache[i].chunkId == chunkId) - { - dev->cacheHits++; - - return &dev->srCache[i]; - } - } - - return NULL; -} - -// Mark the chunk for the least recently used algorithym -static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite) -{ - if( dev->srLastUse < 0 || - dev->srLastUse > 100000000) - { - // Reset the cache usages - int i; - for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++) - { - dev->srCache[i].lastUse = 0; - } - dev->srLastUse = 0; - } - - dev->srLastUse++; - - cache->lastUse = dev->srLastUse; - - if(isAWrite) - { - cache->dirty = 1; - } -} - -// Invalidate a single cache page. -// Do this when a whole page gets written, -// ie the short cache for this page is no longer valid. -static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId) -{ - yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId); - - if(cache) - { - cache->object = NULL; - } -} - - -// Invalidate all the cache pages associated with this object -// Do this whenever ther file is deleted or resized. -static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) -{ - int i; - yaffs_Device *dev = in->myDev; - - // Now invalidate it. - for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - if(dev->srCache[i].object == in) - { - dev->srCache[i].object = NULL; - } - } -} - - -#else - -static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) -{ - return NULL; -} - - -static yaffs_ChunkCache *yaffs_FindChunkCache(yaffs_Device *dev, int objectId, int chunkId) -{ - return NULL; -} - -static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache) -{ -} - -static void yaffs_InvalidateChunkCache(yaffs_Object *obj, int chunkId) -{ -} - -static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) -{ -} - - - -#endif - - - -///////////////////////// File read/write /////////////////////////////// -// Read and write have very similar structures. -// In general the read/write has three parts to it -// * An incomplete chunk to start with (if the read/write is not chunk-aligned) -// * Some complete chunks -// * An incomplete chunk to end off with -// -// Curve-balls: the first chunk might also be the last chunk. - -int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes) -{ - - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - - while(n > 0) - { - chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1 - start = offset % YAFFS_BYTES_PER_CHUNK; - - // OK now check for the curveball where the start and end are in - // the same chunk. - if( (start + n) < YAFFS_BYTES_PER_CHUNK) - { - nToCopy = n; - } - else - { - nToCopy = YAFFS_BYTES_PER_CHUNK - start; - } - - if(nToCopy != YAFFS_BYTES_PER_CHUNK) - { - // An incomplete start or end chunk (or maybe both start and end chunk) -#ifdef CONFIG_YAFFS_SHORT_OP_CACHE - yaffs_ChunkCache *cache; - // If we can't find the data in the cache, then load it up. - cache = yaffs_FindChunkCache(in,chunk); - if(!cache) - { - cache = yaffs_GrabChunkCache(in->myDev); - cache->object = in; - cache->chunkId = chunk; - cache->dirty = 0; - yaffs_ReadChunkDataFromObject(in,chunk,cache->data); - } - - yaffs_UseChunkCache(in->myDev,cache,0); - - memcpy(buffer,&cache->data[start],nToCopy); -#else - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - // Read into the local buffer then copy... - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - memcpy(buffer,&localBuffer[start],nToCopy); -#endif - } - else - { -#ifdef CONFIG_YAFFS_WINCE - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - // Under WinCE can't do direct transfer. Need to use a local buffer. - // This is because we otherwise screw up WinCE's memory mapper - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - memcpy(buffer,localBuffer,YAFFS_BYTES_PER_CHUNK); -#else - // A full chunk. Read directly into the supplied buffer. - yaffs_ReadChunkDataFromObject(in,chunk,buffer); -#endif - } - - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - - } - - return nDone; -} - - - -int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes) -{ - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - int nToWriteBack; - int startOfWrite = offset; - int chunkWritten = 0; - int nBytesRead; - - - - while(n > 0 && chunkWritten >= 0) - { - chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; - start = offset % YAFFS_BYTES_PER_CHUNK; - - - // OK now check for the curveball where the start and end are in - // the same chunk. - - if( (start + n) < YAFFS_BYTES_PER_CHUNK) - { - nToCopy = n; - - // Now folks, to calculate how many bytes to write back.... - // If we're overwriting and not writing to then end of file then - // we need to write back as much as was there before. - - nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK); - - if(nBytesRead > YAFFS_BYTES_PER_CHUNK) - { - nBytesRead = YAFFS_BYTES_PER_CHUNK; - } - - nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n); - - } - else - { - nToCopy = YAFFS_BYTES_PER_CHUNK - start; - nToWriteBack = YAFFS_BYTES_PER_CHUNK; - } - - if(nToCopy != YAFFS_BYTES_PER_CHUNK) - { - // An incomplete start or end chunk (or maybe both start and end chunk) -#ifdef CONFIG_YAFFS_SHORT_OP_CACHE - yaffs_ChunkCache *cache; - // If we can't find the data in the cache, then load it up. - cache = yaffs_FindChunkCache(in,chunk); - if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev)) - { - cache = yaffs_GrabChunkCache(in->myDev); - cache->object = in; - cache->chunkId = chunk; - cache->dirty = 0; - yaffs_ReadChunkDataFromObject(in,chunk,cache->data); - } - - if(cache) - { - yaffs_UseChunkCache(in->myDev,cache,1); - memcpy(&cache->data[start],buffer,nToCopy); - } - else - { - chunkWritten = -1; // fail the write - } -#else - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - // An incomplete start or end chunk (or maybe both start and end chunk) - // Read into the local buffer then copy, then copy over and write back. - - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - - memcpy(&localBuffer[start],buffer,nToCopy); - - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0); - - //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack)); -#endif - - } - else - { - -#ifdef CONFIG_YAFFS_WINCE - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - // Under WinCE can't do direct transfer. Need to use a local buffer. - // This is because we otherwise screw up WinCE's memory mapper - memcpy(localBuffer,buffer,YAFFS_BYTES_PER_CHUNK); - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,YAFFS_BYTES_PER_CHUNK,0); -#else - // A full chunk. Write directly from the supplied buffer. - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0); -#endif - // Since we've overwritten the cached data, we better invalidate it. - yaffs_InvalidateChunkCache(in,chunk); - //T(("Write to chunk %d %d\n",chunk,chunkWritten)); - } - - if(chunkWritten >= 0) - { - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - } - - } - - // Update file object - - if((startOfWrite + nDone) > in->variant.fileVariant.fileSize) - { - in->variant.fileVariant.fileSize = (startOfWrite + nDone); - } - - in->dirty = 1; - - return nDone; -} - - -int yaffs_ResizeFile(yaffs_Object *in, int newSize) -{ - int i; - int chunkId; - int oldFileSize = in->variant.fileVariant.fileSize; - int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK; - - yaffs_Device *dev = in->myDev; - - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - yaffs_FlushFilesChunkCache(in); - yaffs_InvalidateWholeChunkCache(in); - - if(in->variantType != YAFFS_OBJECT_TYPE_FILE) - { - return yaffs_GetFileSize(in); - } - - if(newSize < oldFileSize) - { - - int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK; - - int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/ - YAFFS_BYTES_PER_CHUNK; - - // Delete backwards so that we don't end up with holes if - // power is lost part-way through the operation. - for(i = lastDel; i >= startDel; i--) - { - // NB this could be optimised somewhat, - // eg. could retrieve the tags and write them without - // using yaffs_DeleteChunk - - chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL); - if(chunkId <= 0 || chunkId >= (dev->endBlock * 32)) - { - //T(("Found daft chunkId %d for %d\n",chunkId,i)); - } - else - { - in->nDataChunks--; - yaffs_DeleteChunk(dev,chunkId); - } - } - - - if(sizeOfPartialChunk != 0) - { - int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK; - - // Got to read and rewrite the last chunk with its new size. - yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer); - - yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1); - - } - - in->variant.fileVariant.fileSize = newSize; - - yaffs_PruneFileStructure(dev,&in->variant.fileVariant); - - return newSize; - - } - else - { - return oldFileSize; - } -} - - -loff_t yaffs_GetFileSize(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - return obj->variant.fileVariant.fileSize; - case YAFFS_OBJECT_TYPE_SYMLINK: - return strlen(obj->variant.symLinkVariant.alias); - default: - return 0; - } -} - - - -// yaffs_FlushFile() updates the file's -// objectId in NAND - -int yaffs_FlushFile(yaffs_Object *in) -{ - int retVal; - if(in->dirty) - { - //T(("flushing object header\n")); - - yaffs_FlushFilesChunkCache(in); - -#ifdef CONFIG_YAFFS_WINCE - yfsd_WinFileTimeNow(in->win_mtime); -#else - in->st_mtime = CURRENT_TIME; -#endif - - retVal = yaffs_UpdateObjectHeader(in,NULL,0); - } - else - { - retVal = YAFFS_OK; - } - - return retVal; - -} - - -static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) -{ - - // First off, invalidate the file's data in the cache, without flushing. - yaffs_InvalidateWholeChunkCache(in); - - yaffs_RemoveObjectFromDirectory(in); - yaffs_DeleteChunk(in->myDev,in->chunkId); -#ifdef __KERNEL__ - if(in->myInode) - { - in->myInode->u.generic_ip = NULL; - in->myInode = 0; - } -#endif - yaffs_FreeObject(in); - return YAFFS_OK; - -} - -// yaffs_DeleteFile deletes the whole file data -// and the inode associated with the file. -// It does not delete the links associated with the file. -static int yaffs_UnlinkFile(yaffs_Object *in) -{ - -#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION - // Delete the file data & tnodes - - yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL); - - - yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); - - return yaffs_DoGenericObjectDeletion(in); -#else - int retVal; - int immediateDeletion=0; - retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0); - if(retVal == YAFFS_OK) - { - //in->unlinked = 1; - //in->myDev->nUnlinkedFiles++; - //in->renameAllowed = 0; -#ifdef __KERNEL__ - if(in->myInode) - { - immediateDeletion = 1; - - } -#endif -#ifdef CONFIG_YAFFS_WINCE - if(in->inUse <= 0) - { - immediateDeletion = 1; - - } -#endif - - if(immediateDeletion) - { - T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId)); - in->deleted=1; - in->myDev->nDeletedFiles++; - } - - } - return retVal; - - -#endif -} - -int yaffs_DeleteFile(yaffs_Object *in) -{ - int retVal = YAFFS_OK; - if(!in->unlinked) - { - retVal = yaffs_UnlinkFile(in); - } - if(retVal == YAFFS_OK && - in->unlinked && - !in->deleted) - { - in->deleted = 1; - in->myDev->nDeletedFiles++; - } - return in->deleted ? YAFFS_OK : YAFFS_FAIL; -} - -static int yaffs_DeleteDirectory(yaffs_Object *in) -{ - //First check that the directory is empty. - if(list_empty(&in->variant.directoryVariant.children)) - { - return yaffs_DoGenericObjectDeletion(in); - } - - return YAFFS_FAIL; - -} - -static int yaffs_DeleteSymLink(yaffs_Object *in) -{ - YFREE(in->variant.symLinkVariant.alias); - - return yaffs_DoGenericObjectDeletion(in); -} - -static int yaffs_DeleteHardLink(yaffs_Object *in) -{ - // remove this hardlink from the list assocaited with the equivalent - // object - list_del(&in->hardLinks); - return yaffs_DoGenericObjectDeletion(in); -} - - -static int yaffs_UnlinkWorker(yaffs_Object *obj) -{ - - - if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - { - return yaffs_DeleteHardLink(obj); - } - else if(!list_empty(&obj->hardLinks)) - { - // Curve ball: We're unlinking an object that has a hardlink. - // - // This problem arises because we are not strictly following - // The Linux link/inode model. - // - // We can't really delete the object. - // Instead, we do the following: - // - Select a hardlink. - // - Unhook it from the hard links - // - Unhook it from its parent directory (so that the rename can work) - // - Rename the object to the hardlink's name. - // - Delete the hardlink - - - yaffs_Object *hl; - int retVal; - char name[YAFFS_MAX_NAME_LENGTH+1]; - - hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks); - - list_del_init(&hl->hardLinks); - list_del_init(&hl->siblings); - - yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1); - - retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0); - - if(retVal == YAFFS_OK) - { - retVal = yaffs_DoGenericObjectDeletion(hl); - } - return retVal; - - } - else - { - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - return yaffs_UnlinkFile(obj); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - return yaffs_DeleteDirectory(obj); - break; - case YAFFS_OBJECT_TYPE_SYMLINK: - return yaffs_DeleteSymLink(obj); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - return YAFFS_FAIL; - } - } -} - -int yaffs_Unlink(yaffs_Object *dir, const char *name) -{ - yaffs_Object *obj; - - obj = yaffs_FindObjectByName(dir,name); - - if(obj && obj->unlinkAllowed) - { - return yaffs_UnlinkWorker(obj); - } - - return YAFFS_FAIL; - -} - -//////////////// Initialisation Scanning ///////////////// - - - -// For now we use the SmartMedia check. -// We look at the blockStatus byte in the first two chunks -// These must be 0xFF to pass as OK. -// todo: this function needs to be modifyable foir different NAND types -// and different chunk sizes. Suggest make this into a per-device configurable -// function. -static int yaffs_IsBlockBad(yaffs_Device *dev, int blk) -{ - yaffs_Spare spare; - - yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK,NULL,&spare,1); -#if 1 - if(yaffs_CountBits(spare.blockStatus) < 7) - { - return 1; - } -#else - if(spare.blockStatus != 0xFF) - { - return 1; - } -#endif - yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK + 1,NULL,&spare,1); - -#if 1 - if(yaffs_CountBits(spare.blockStatus) < 7) - { - return 1; - } -#else - if(spare.blockStatus != 0xFF) - { - return 1; - } -#endif - - return 0; - -} - -static int yaffs_Scan(yaffs_Device *dev) -{ - yaffs_Spare spare; - yaffs_Tags tags; - int blk; - int chunk; - int c; - int deleted; - yaffs_BlockState state; - yaffs_Object *hardList = NULL; - yaffs_Object *hl; - yaffs_BlockInfo *bi; - - - yaffs_ObjectHeader *oh; - yaffs_Object *in; - yaffs_Object *parent; - - __u8 chunkData[YAFFS_BYTES_PER_CHUNK]; - - - // Scan all the blocks... - - for(blk = dev->startBlock; blk <= dev->endBlock; blk++) - { - deleted = 0; - bi = yaffs_GetBlockInfo(dev,blk); - bi->pageBits = 0; - bi->pagesInUse = 0; - state = YAFFS_BLOCK_STATE_SCANNING; - - - if(yaffs_IsBlockBad(dev,blk)) - { - state = YAFFS_BLOCK_STATE_DEAD; - T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk)); - } - - // Read each chunk in the block. - - for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK && - state == YAFFS_BLOCK_STATE_SCANNING; c++) - { - // Read the spare area and decide what to do - chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c; - - yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1); - - - // This block looks ok, now what's in this chunk? - yaffs_GetTagsFromSpare(dev,&spare,&tags); - - if(yaffs_CountBits(spare.pageStatus) < 6) - { - // A deleted chunk - deleted++; - dev->nFreeChunks ++; - //T((" %d %d deleted\n",blk,c)); - } - else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID) - { - // An unassigned chunk in the block - // This means that either the block is empty or - // this is the one being allocated from - - if(c == 0) - { - // the block is unused - state = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - } - else - { - // this is the block being allocated from - T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c)); - state = YAFFS_BLOCK_STATE_ALLOCATING; - dev->allocationBlock = blk; - dev->allocationPage = c; - } - - dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c); - } - else if(tags.chunkId > 0) - { - int endpos; - // A data chunk. - bi->pageBits |= (1 << c); - bi->pagesInUse++; - - in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE); - // PutChunkIntoFIle checks for a clash (two data chunks with - // the same chunkId). - yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1); - endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount; - if(in->variant.fileVariant.scannedFileSize variant.fileVariant.scannedFileSize = endpos; -#ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE - in->variant.fileVariant.fileSize = - in->variant.fileVariant.scannedFileSize; -#endif - - } - //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); - } - else - { - // chunkId == 0, so it is an ObjectHeader. - // Thus, we read in the object header and make the object - bi->pageBits |= (1 << c); - bi->pagesInUse++; - - yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1); - - oh = (yaffs_ObjectHeader *)chunkData; - - in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type); - - if(in->valid) - { - // We have already filled this one. We have a duplicate and need to resolve it. - - unsigned existingSerial = in->serial; - unsigned newSerial = tags.serialNumber; - - if(((existingSerial+1) & 3) == newSerial) - { - // Use new one - destroy the exisiting one - yaffs_DeleteChunk(dev,in->chunkId); - in->valid = 0; - } - else - { - // Use existing - destroy this one. - yaffs_DeleteChunk(dev,chunk); - } - } - - if(!in->valid && - (tags.objectId == YAFFS_OBJECTID_ROOT || - tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) - { - // We only load some info, don't fiddle with directory structure - in->valid = 1; - in->variantType = oh->type; - - in->st_mode = oh->st_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->st_uid = oh->st_uid; - in->st_gid = oh->st_gid; - in->st_atime = oh->st_atime; - in->st_mtime = oh->st_mtime; - in->st_ctime = oh->st_ctime; - in->st_rdev = oh->st_rdev; -#endif - in->chunkId = chunk; - - } - else if(!in->valid) - { - // we need to load this info - - in->valid = 1; - in->variantType = oh->type; - - in->st_mode = oh->st_mode; -#ifdef CONFIG_YAFFS_WINCE - in->win_atime[0] = oh->win_atime[0]; - in->win_ctime[0] = oh->win_ctime[0]; - in->win_mtime[0] = oh->win_mtime[0]; - in->win_atime[1] = oh->win_atime[1]; - in->win_ctime[1] = oh->win_ctime[1]; - in->win_mtime[1] = oh->win_mtime[1]; -#else - in->st_uid = oh->st_uid; - in->st_gid = oh->st_gid; - in->st_atime = oh->st_atime; - in->st_mtime = oh->st_mtime; - in->st_ctime = oh->st_ctime; - in->st_rdev = oh->st_rdev; -#endif - in->chunkId = chunk; - - yaffs_SetObjectName(in,oh->name); - in->dirty = 0; - - // directory stuff... - // hook up to parent - - parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY); - if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) - { - // Set up as a directory - parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; - INIT_LIST_HEAD(&parent->variant.directoryVariant.children); - } - else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) - { - // Hoosterman, another problem.... - // We're trying to use a non-directory as a directory - // Todo ... handle - T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: attempting to use non-directory as a directory in scan" TENDSTR))); - - } - - yaffs_AddObjectToDirectory(parent,in); - if(parent == dev->unlinkedDir) - { - in->deleted = 1; // If it is unlinked at start up then it wants deleting - dev->nDeletedFiles++; - } - - // Note re hardlinks. - // Since we might scan a hardlink before its equivalent object is scanned - // we put them all in a list. - // After scanning is complete, we should have all the objects, so we run through this - // list and fix up all the chains. - - switch(in->variantType) - { - case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem - break; - case YAFFS_OBJECT_TYPE_FILE: -#ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE - in->variant.fileVariant.fileSize = oh->fileSize; -#endif - break; - case YAFFS_OBJECT_TYPE_HARDLINK: - in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId; - (yaffs_Object *)(in->hardLinks.next) = hardList; - hardList = in; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing - break; - case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing - break; - case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing - in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias); - break; - } - //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType)); - } - } - } - - if(state == YAFFS_BLOCK_STATE_SCANNING) - { - // If we got this far while scanning, then the block is fully allocated. - state = YAFFS_BLOCK_STATE_FULL; - } - - bi->blockState = state; - - // Now let's see if it was dirty - if( bi->pagesInUse == 0 && - bi->blockState == YAFFS_BLOCK_STATE_FULL) - { - yaffs_BlockBecameDirty(dev,blk); - } - - } - - // Fix up the hard link chains. - // We should now have scanned all the objects, now it's time to add these - // hardlinks. - while(hardList) - { - hl = hardList; - hardList = (yaffs_Object *)(hardList->hardLinks.next); - - in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId); - - if(in) - { - // Add the hardlink pointers - hl->variant.hardLinkVariant.equivalentObject=in; - list_add(&hl->hardLinks,&in->hardLinks); - } - else - { - //Todo Need to report/handle this better. - // Got a problem... hardlink to a non-existant object - hl->variant.hardLinkVariant.equivalentObject=NULL; - INIT_LIST_HEAD(&hl->hardLinks); - - } - - } - - - - return YAFFS_OK; -} - - -////////////////////////// Directory Functions ///////////////////////// - - -static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj) -{ - - if(obj->siblings.prev == NULL) - { - // Not initialised - INIT_LIST_HEAD(&obj->siblings); - - } - else if(!list_empty(&obj->siblings)) - { - // If it is holed up somewhere else, un hook it - list_del_init(&obj->siblings); - } - // Now add it - list_add(&obj->siblings,&directory->variant.directoryVariant.children); - obj->parent = directory; - - if(directory == obj->myDev->unlinkedDir) - { - obj->unlinked = 1; - obj->myDev->nUnlinkedFiles++; - obj->renameAllowed = 0; - } -} - -static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj) -{ - list_del_init(&obj->siblings); - obj->parent = NULL; -} - -yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name) -{ - int sum; - - struct list_head *i; - char buffer[YAFFS_MAX_NAME_LENGTH+1]; - - yaffs_Object *l; - - sum = yaffs_CalcNameSum(name); - - list_for_each(i,&directory->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - - // Special case for lost-n-found - if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND) - { - if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0) - { - return l; - } - } - else if(yaffs_SumCompare(l->sum, sum)) - { - // Do a real check - yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH); - if(yaffs_strcmp(name,buffer) == 0) - { - return l; - } - - - } - } - - return NULL; -} - - -int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)) -{ - struct list_head *i; - yaffs_Object *l; - - - list_for_each(i,&theDir->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - if(!fn(l)) - { - return YAFFS_FAIL; - } - } - - return YAFFS_OK; - -} - - -// GetEquivalentObject dereferences any hard links to get to the -// actual object. - -yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj) -{ - if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) - { - // We want the object id of the equivalent object, not this one - obj = obj->variant.hardLinkVariant.equivalentObject; - } - return obj; - -} - -int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize) -{ - memset(name,0,buffSize); - - if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) - { - strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1); - } - else if(obj->chunkId <= 0) - { - char locName[20]; - // make up a name - sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId); - strncpy(name,locName,buffSize - 1); - - } -#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM - else if(obj->shortName[0]) - { - strcpy(name,obj->shortName); - } -#endif - else - { - __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; - - memset(buffer,0,YAFFS_BYTES_PER_CHUNK); - - if(obj->chunkId >= 0) - { - yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1); - } - strncpy(name,oh->name,buffSize - 1); - } - - return strlen(name); -} - -int yaffs_GetObjectFileLength(yaffs_Object *obj) -{ - - // Dereference any hard linking - obj = yaffs_GetEquivalentObject(obj); - - if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) - { - return obj->variant.fileVariant.fileSize; - } - if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) - { - return strlen(obj->variant.symLinkVariant.alias); - } - else - { - // Only a directory should drop through to here - return YAFFS_BYTES_PER_CHUNK; - } -} - -int yaffs_GetObjectLinkCount(yaffs_Object *obj) -{ - int count = 0; - struct list_head *i; - - if(!obj->unlinked) - { - count++; // the object itself - } - list_for_each(i,&obj->hardLinks) - { - count++; // add the hard links; - } - return count; - -} - - -int yaffs_GetObjectInode(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - return obj->objectId; -} - -unsigned yaffs_GetObjectType(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break; - case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break; - case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break; - case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break; - case YAFFS_OBJECT_TYPE_SPECIAL: - if(S_ISFIFO(obj->st_mode)) return DT_FIFO; - if(S_ISCHR(obj->st_mode)) return DT_CHR; - if(S_ISBLK(obj->st_mode)) return DT_BLK; - if(S_ISSOCK(obj->st_mode)) return DT_SOCK; - default: return DT_REG; break; - } -} - -char *yaffs_GetSymlinkAlias(yaffs_Object *obj) -{ - obj = yaffs_GetEquivalentObject(obj); - if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) - { - return yaffs_CloneString(obj->variant.symLinkVariant.alias); - } - else - { - return yaffs_CloneString(""); - } -} - -#ifndef CONFIG_YAFFS_WINCE - -int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr) -{ - unsigned int valid = attr->ia_valid; - - if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode; - if(valid & ATTR_UID) obj->st_uid = attr->ia_uid; - if(valid & ATTR_GID) obj->st_gid = attr->ia_gid; - - if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime; - if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime; - if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime; - - if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size); - - yaffs_UpdateObjectHeader(obj,NULL,1); - - return YAFFS_OK; - -} -int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr) -{ - unsigned int valid = 0; - - attr->ia_mode = obj->st_mode; valid |= ATTR_MODE; - attr->ia_uid = obj->st_uid; valid |= ATTR_UID; - attr->ia_gid = obj->st_gid; valid |= ATTR_GID; - - attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME; - attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME; - attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME; - - attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE; - - attr->ia_valid = valid; - - return YAFFS_OK; - -} - -#endif - -int yaffs_DumpObject(yaffs_Object *obj) -{ -// __u8 buffer[YAFFS_BYTES_PER_CHUNK]; - char name[257]; -// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; - -// memset(buffer,0,YAFFS_BYTES_PER_CHUNK); - -// if(obj->chunkId >= 0) -// { -// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); -// } - - yaffs_GetObjectName(obj,name,256); - - T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR), - obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, - obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj))); - -#if 0 - YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n", - obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial, - obj->sum, obj->chunkId)); - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize)); - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - YPRINTF((" DIRECTORY\n")); - break; - case YAFFS_OBJECT_TYPE_HARDLINK: //todo - case YAFFS_OBJECT_TYPE_SYMLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - default: - } -#endif - - return YAFFS_OK; -} - - -///////////////////////// Initialisation code /////////////////////////// - - - -int yaffs_GutsInitialise(yaffs_Device *dev) -{ - unsigned x; - int bits; - int extraBits; - int nBlocks; - - - - if(!yaffs_CheckStructures()) - { - T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR))); - return YAFFS_FAIL; - } - - if(dev->startBlock <= 0 || - (dev->endBlock - dev->startBlock) < 10) - { - T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR), - dev->startBlock, dev->endBlock)); - return YAFFS_FAIL; - } - - nBlocks = dev->endBlock - dev->startBlock + 1; - - - - // OK now calculate a few things for the device - // Calculate chunkGroupBits. - // We need to find the next power of 2 > than endBlock - - x = YAFFS_CHUNKS_PER_BLOCK * (dev->endBlock+1); - - for(bits = extraBits = 0; x > 1; bits++) - { - if(x & 1) extraBits++; - x >>= 1; - } - - if(extraBits > 0) bits++; - - - // Level0 Tnodes are 16 bits, so if the bitwidth of the - // chunk range we're using is greater than 16 we need - // to figure out chunk shift and chunkGroupSize - if(bits <= 16) - { - dev->chunkGroupBits = 0; - } - else - { - dev->chunkGroupBits = bits - 16; - } - dev->chunkGroupSize = 1 << dev->chunkGroupBits; - - - // More device initialisation - dev->garbageCollectionRequired = 0; - dev->garbageCollections = 0; - dev->currentDirtyChecker = 0; - dev->bufferedBlock = -1; - dev->doingBufferedBlockRewrite = 0; - dev->blockSelectedForGC = -1; - dev->nDeletedFiles = 0; - dev->nBackgroundDeletions=0; - dev->nUnlinkedFiles = 0; - dev->eccFixed=0; - dev->eccUnfixed=0; - dev->tagsEccFixed=0; - dev->tagsEccUnfixed=0; - - yaffs_InitialiseBlocks(dev,nBlocks); - - yaffs_InitialiseTnodes(dev); - - yaffs_InitialiseObjects(dev); - -#ifdef CONFIG_YAFFS_SHORT_OP_CACHE - { - int i; - for(i=0; i < YAFFS_N_CACHE_CHUNKS; i++) - { - dev->srCache[i].object = NULL; - dev->srCache[i].lastUse = 0; - dev->srCache[i].dirty = 0; - } - dev->srLastUse = 0; - } -#endif - - dev->cacheHits = 0; - - - // Initialise the unlinked, root and lost and found directories - dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL; - - dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR); - - dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR); - dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR); - yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir); - - - // Now scan the flash. - yaffs_Scan(dev); - - // Zero out stats - dev->nPageReads = 0; - dev->nPageWrites = 0; - dev->nBlockErasures = 0; - dev->nGCCopies = 0; - dev->nRetriedWrites = 0; - dev->nRetiredBlocks = 0; - - - return YAFFS_OK; - -} - -void yaffs_Deinitialise(yaffs_Device *dev) -{ - yaffs_DeinitialiseBlocks(dev); - yaffs_DeinitialiseTnodes(dev); - yaffs_DeinitialiseObjects(dev); - -} - -int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) -{ - int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS); - - struct list_head *i; - yaffs_Object *l; - - - // To the free chunks add the chunks that are in the deleted unlinked files. - list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) - { - l = list_entry(i, yaffs_Object,siblings); - if(l->deleted) - { - nFree++; - nFree += l->nDataChunks; - } - } - - - return (nFree < 0) ? 0 : nFree; - -} - - -/////////////////// YAFFS test code ////////////////////////////////// - -#define yaffs_CheckStruct(structure,syze, name) \ - if(sizeof(structure) != syze) \ - { \ - T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \ - return YAFFS_FAIL; \ - } - - -static int yaffs_CheckStructures(void) -{ - yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") - yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") - yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") - yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode") - yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader") - - - return YAFFS_OK; -} - -#if 0 -void yaffs_GutsTest(yaffs_Device *dev) -{ - - if(yaffs_CheckStructures() != YAFFS_OK) - { - T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR))); - return; - } - - yaffs_TnodeTest(dev); - yaffs_ObjectTest(dev); -} -#endif - - - +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yaffs_guts.c The main guts of YAFFS + * + * Copyright (C) 2002 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + //yaffs_guts.c + +const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.13 2002-11-26 01:15:37 charles Exp $"; + +#include "yportenv.h" + +#include "yaffsinterface.h" +#include "yaffs_guts.h" + + +#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2 + + + +// External functions for ECC on data +void nand_calculate_ecc (const u_char *dat, u_char *ecc_code); +int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc); + + +// countBits is a quick way of counting the number of bits in a byte. +// ie. countBits[n] holds the number of 1 bits in a byte with the value n. + +static const char yaffs_countBitsTable[256] = +{ +0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, +4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 +}; + +static int yaffs_CountBits(__u8 x) +{ + int retVal; + retVal = yaffs_countBitsTable[x]; + return retVal; +} + + + +// Local prototypes +static int yaffs_CheckObjectHashSanity(yaffs_Device *dev); +static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr); +static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr); +static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan); + +static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type); +static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj); +static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force); +static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId); +static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); +static int yaffs_CheckStructures(void); +static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit); +static int yaffs_DoGenericObjectDeletion(yaffs_Object *in); + +static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo); + +// Robustification +static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND); +static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND); +static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND); +static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare); +static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare); + +static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND); + +static int yaffs_UnlinkWorker(yaffs_Object *obj); + + +static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1); + + + +loff_t yaffs_GetFileSize(yaffs_Object *obj); + +static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted); +static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted); + + +static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve); + +#ifdef YAFFS_PARANOID +static int yaffs_CheckFileSanity(yaffs_Object *in); +#else +#define yaffs_CheckFileSanity(in) +#endif + +static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in); +static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId); + + +static __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk) +{ + if(blk < dev->startBlock || blk > dev->endBlock) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: block %d is not valid" TENDSTR),blk)); + YBUG(); + } + return &dev->blockInfo[blk - dev->startBlock]; +} + + +static __inline__ int yaffs_HashFunction(int n) +{ + return (n % YAFFS_NOBJECT_BUCKETS); +} + + +yaffs_Object *yaffs_Root(yaffs_Device *dev) +{ + return dev->rootDir; +} + +yaffs_Object *yaffs_LostNFound(yaffs_Device *dev) +{ + return dev->lostNFoundDir; +} + + +static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare) +{ + if(chunkInNAND < dev->startBlock * YAFFS_CHUNKS_PER_BLOCK) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND)); + return YAFFS_FAIL; + } + + dev->nPageWrites++; + return dev->writeChunkToNAND(dev,chunkInNAND,data,spare); +} + +struct nandspare { + yaffs_Spare spare; + int eccres1; + int eccres2; +}; + +int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev, + int chunkInNAND, + __u8 *data, + yaffs_Spare *spare, + int doErrorCorrection) +{ + int retVal; + yaffs_Spare localSpare; + +#ifndef CONFIG_YAFFS_USE_NANDECC + __u8 calcEcc[3]; + int eccResult1,eccResult2; +#else + struct nandspare nspare; +#endif + + dev->nPageReads++; + + + + + if(!spare && data) + { + // If we don't have a real spare, then we use a local one. + // Need this for the calculation of the ecc + spare = &localSpare; + } + + +#ifndef CONFIG_YAFFS_USE_NANDECC + retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare); + if(data && doErrorCorrection) + { + // Hoosterman, we had a data problem on this page + yaffs_HandleReadDataError(dev,chunkInNAND); + } +#else + retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare); + memcpy (spare, &nspare, sizeof(yaffs_Spare)); + if(data && doErrorCorrection) + { + if(nspare.eccres1>0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND)); + } + else if(nspare.eccres1<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND)); + } + + if(nspare.eccres2>0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND)); + } + else if(nspare.eccres2<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND)); + } + + if(nspare.eccres2 || nspare.eccres2) + { + // Hoosterman, we had a data problem on this page + yaffs_HandleReadDataError(dev,chunkInNAND); + } + + } +#endif + return retVal; +} + + +static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND) +{ + + static int init = 0; + static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK]; + static __u8 data[YAFFS_BYTES_PER_CHUNK]; + static __u8 spare[16]; + + + dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare); + + + + if(!init) + { + memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK); + init = 1; + } + + if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return YAFFS_FAIL; + if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL; + + + return YAFFS_OK; + +} + + + +int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND) +{ + dev->nBlockErasures++; + return dev->eraseBlockInNAND(dev,blockInNAND); +} + +int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev) +{ + return dev->initialiseNAND(dev); +} + +static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve) +{ + int chunk; + + int writeOk = 1; + int attempts = 0; + + unsigned char rbData[YAFFS_BYTES_PER_CHUNK]; + yaffs_Spare rbSpare; + + do{ + chunk = yaffs_AllocateChunk(dev,useReserve); + + if(chunk >= 0) + { + + // First check this chunk is erased... +#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK + writeOk = yaffs_CheckChunkErased(dev,chunk); +#endif + if(!writeOk) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk)); + } + else + { + writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare); + } + attempts++; + if(writeOk) + { + // Readback & verify + // If verify fails, then delete this chunk and try again + // To verify we compare everything except the block and + // page status bytes. + // NB We check a raw read without ECC correction applied + yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0); + +#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY + if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare)) + { + // Didn't verify + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk)); + + writeOk = 0; + } +#endif + + } + if(writeOk) + { + // Copy the data into the write buffer. + // NB We do this at the end to prevent duplicates in the case of a write error. + //Todo + yaffs_HandleWriteChunkOk(dev,chunk,data,spare); + } + else + { + yaffs_HandleWriteChunkError(dev,chunk); + } + } + + } while(chunk >= 0 && ! writeOk); + + if(attempts > 1) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts)); + dev->nRetriedWrites+= (attempts - 1); + } + + return chunk; +} + +/// +// Functions for robustisizing +// +// + +static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND) +{ + // Ding the blockStatus in the first two pages of the block. + + yaffs_Spare spare; + + memset(&spare, 0xff,sizeof(yaffs_Spare)); + + spare.blockStatus = 0; + + yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK, NULL , &spare); + yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK + 1, NULL , &spare); + + yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD; + dev->nRetiredBlocks++; +} + + + +static int yaffs_RewriteBufferedBlock(yaffs_Device *dev) +{ + dev->doingBufferedBlockRewrite = 1; + // + // Remove erased chunks + // Rewrite existing chunks to a new block + // Set current write block to the new block + + dev->doingBufferedBlockRewrite = 0; + + return 1; +} + + +static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND) +{ + int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK; + + // Mark the block for retirement + yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1; + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND)); + + + //TODO + // Just do a garbage collection on the affected block then retire the block + // NB recursion +} + + +static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND) +{ +} + +static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare) +{ +} + +static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare) +{ +} + +static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND) +{ + int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK; + + // Mark the block for retirement + yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1; + // Delete the chunk + yaffs_DeleteChunk(dev,chunkInNAND); +} + + + + +static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1) +{ + + + if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 || + s0->tagByte0 != s1->tagByte0 || + s0->tagByte1 != s1->tagByte1 || + s0->tagByte2 != s1->tagByte2 || + s0->tagByte3 != s1->tagByte3 || + s0->tagByte4 != s1->tagByte4 || + s0->tagByte5 != s1->tagByte5 || + s0->tagByte6 != s1->tagByte6 || + s0->tagByte7 != s1->tagByte7 || + s0->ecc1[0] != s1->ecc1[0] || + s0->ecc1[1] != s1->ecc1[1] || + s0->ecc1[2] != s1->ecc1[2] || + s0->ecc2[0] != s1->ecc2[0] || + s0->ecc2[1] != s1->ecc2[1] || + s0->ecc2[2] != s1->ecc2[2] ) + { + return 0; + } + + return 1; +} + + +///////////////////////// Object management ////////////////// +// List of spare objects +// The list is hooked together using the first pointer +// in the object + +// static yaffs_Object *yaffs_freeObjects = NULL; + +// static int yaffs_nFreeObjects; + +// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL; + +// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS]; + + +static __u16 yaffs_CalcNameSum(const char *name) +{ + __u16 sum = 0; + __u16 i = 1; + + __u8 *bname = (__u8 *)name; + if(bname) + { + while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH)) + { +#ifdef CONFIG_YAFFS_WINCE + sum += toupper(*bname) * i; +#else + sum += (*bname) * i; +#endif + i++; + bname++; + } + } + return sum; +} + +void yaffs_SetObjectName(yaffs_Object *obj, const char *name) +{ +#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM + if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH) + { + strcpy(obj->shortName,name); + } + else + { + obj->shortName[0]='\0'; + } +#endif + obj->sum = yaffs_CalcNameSum(name); +} + +void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare) +{ + nand_calculate_ecc (data , spare->ecc1); + nand_calculate_ecc (&data[256] , spare->ecc2); +} + +void yaffs_CalcTagsECC(yaffs_Tags *tags) +{ + // Calculate an ecc + + unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; + unsigned i,j; + unsigned ecc = 0; + unsigned bit = 0; + + tags->ecc = 0; + + for(i = 0; i < 8; i++) + { + for(j = 1; j &0xff; j<<=1) + { + bit++; + if(b[i] & j) + { + ecc ^= bit; + } + } + } + + tags->ecc = ecc; + + +} + +int yaffs_CheckECCOnTags(yaffs_Tags *tags) +{ + unsigned ecc = tags->ecc; + + yaffs_CalcTagsECC(tags); + + ecc ^= tags->ecc; + + if(ecc && ecc <= 64) + { + // TODO: Handle the failure better. Retire? + unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; + + ecc--; + + b[ecc / 8] ^= (1 << (ecc & 7)); + + // Now recvalc the ecc + yaffs_CalcTagsECC(tags); + + return 1; // recovered error + } + else if(ecc) + { + // Wierd ecc failure value + // TODO Need to do somethiong here + return -1; //unrecovered error + } + + return 0; +} + + +///////////////////////// TNODES /////////////////////// + +// List of spare tnodes +// The list is hooked together using the first pointer +// in the tnode. + +//static yaffs_Tnode *yaffs_freeTnodes = NULL; + +// static int yaffs_nFreeTnodes; + +//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL; + + + +// yaffs_CreateTnodes creates a bunch more tnodes and +// adds them to the tnode free list. +// Don't use this function directly + +static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes) +{ + int i; + yaffs_Tnode *newTnodes; + yaffs_TnodeList *tnl; + + if(nTnodes < 1) return YAFFS_OK; + + // make these things + + newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode)); + + if (!newTnodes) + { + T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR))); + return YAFFS_FAIL; + } + + // Hook them into the free list + for(i = 0; i < nTnodes - 1; i++) + { + newTnodes[i].internal[0] = &newTnodes[i+1]; + } + + newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; + dev->freeTnodes = newTnodes; + dev->nFreeTnodes+= nTnodes; + dev->nTnodesCreated += nTnodes; + + // Now add this bunch of tnodes to a list for freeing up. + // NB If we can't add this to the management list it isn't fatal + // but it just means we can't free this bunch of tnodes later. + tnl = YMALLOC(sizeof(yaffs_TnodeList)); + if(!tnl) + { + T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR))); + + } + else + { + tnl->tnodes = newTnodes; + tnl->next = dev->allocatedTnodeList; + dev->allocatedTnodeList = tnl; + } + + + T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR))); + + + return YAFFS_OK; +} + + +// GetTnode gets us a clean tnode. Tries to make allocate more if we run out +static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev) +{ + yaffs_Tnode *tn = NULL; + + // If there are none left make more + if(!dev->freeTnodes) + { + yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES); + } + + if(dev->freeTnodes) + { + tn = dev->freeTnodes; + dev->freeTnodes = dev->freeTnodes->internal[0]; + dev->nFreeTnodes--; + // zero out + memset(tn,0,sizeof(yaffs_Tnode)); + } + + + return tn; +} + + +// FreeTnode frees up a tnode and puts it back on the free list +static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn) +{ + tn->internal[0] = dev->freeTnodes; + dev->freeTnodes = tn; + dev->nFreeTnodes++; +} + + +static void yaffs_DeinitialiseTnodes(yaffs_Device*dev) +{ + // Free the list of allocated tnodes + + while(dev->allocatedTnodeList) + { + YFREE(dev->allocatedTnodeList->tnodes); + dev->allocatedTnodeList = dev->allocatedTnodeList->next; + } + + dev->freeTnodes = NULL; + dev->nFreeTnodes = 0; +} + +static void yaffs_InitialiseTnodes(yaffs_Device*dev) +{ + dev->allocatedTnodeList = NULL; + dev->freeTnodes = NULL; + dev->nFreeTnodes = 0; + dev->nTnodesCreated = 0; + +} + +#if 0 +void yaffs_TnodeTest(yaffs_Device *dev) +{ + + int i; + int j; + yaffs_Tnode *tn[1000]; + + YINFO("Testing TNodes"); + + for(j = 0; j < 50; j++) + { + for(i = 0; i < 1000; i++) + { + tn[i] = yaffs_GetTnode(dev); + if(!tn[i]) + { + YALERT("Getting tnode failed"); + } + } + for(i = 0; i < 1000; i+=3) + { + yaffs_FreeTnode(dev,tn[i]); + tn[i] = NULL; + } + + } +} +#endif + + +////////////////// END OF TNODE MANIPULATION /////////////////////////// + +/////////////// Functions to manipulate the look-up tree (made up of tnodes) +// The look up tree is represented by the top tnode and the number of topLevel +// in the tree. 0 means only the level 0 tnode is in the tree. + + +// FindLevel0Tnode finds the level 0 tnode, if one exists. +// Used when reading..... +static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId) +{ + + yaffs_Tnode *tn = fStruct->top; + __u32 i; + int requiredTallness; + int level = fStruct->topLevel; + + // Check sane level and chunk Id + if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL) + { +// char str[50]; +// sprintf(str,"Bad level %d",level); +// YALERT(str); + return NULL; + } + + if(chunkId > YAFFS_MAX_CHUNK_ID) + { +// char str[50]; +// sprintf(str,"Bad chunkId %d",chunkId); +// YALERT(str); + return NULL; + } + + // First check we're tall enough (ie enough topLevel) + + i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); + requiredTallness = 0; + while(i) + { + i >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + + if(requiredTallness > fStruct->topLevel) + { + // Not tall enough, so we can't find it, return NULL. + return NULL; + } + + + // Traverse down to level 0 + while (level > 0 && tn) + { + tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK]; + level--; + + } + + return tn; +} + +// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree. +// This happens in two steps: +// 1. If the tree isn't tall enough, then make it taller. +// 2. Scan down the tree towards the level 0 tnode adding tnodes if required. +// +// Used when modifying the tree. +// +static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId) +{ + + yaffs_Tnode *tn; + + int requiredTallness; + int i; + int l; + + __u32 x; + + + //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId)); + + // Check sane level and page Id + if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) + { +// char str[50]; +// sprintf(str,"Bad level %d",fStruct->topLevel); +// YALERT(str); + return NULL; + } + + if(chunkId > YAFFS_MAX_CHUNK_ID) + { +// char str[50]; +// sprintf(str,"Bad chunkId %d",chunkId); +// YALERT(str); + return NULL; + } + + // First check we're tall enough (ie enough topLevel) + + x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); + requiredTallness = 0; + while(x) + { + x >>= YAFFS_TNODES_INTERNAL_BITS; + requiredTallness++; + } + + //T((TSTR(" required=%d"),requiredTallness)); + + + if(requiredTallness > fStruct->topLevel) + { + // Not tall enough,gotta make the tree taller + for(i = fStruct->topLevel; i < requiredTallness; i++) + { + //T((TSTR(" add new top"))); + + tn = yaffs_GetTnode(dev); + + if(tn) + { + tn->internal[0] = fStruct->top; + fStruct->top = tn; + } + else + { + T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR))); + } + } + + fStruct->topLevel = requiredTallness; + } + + + // Traverse down to level 0, adding anything we need + + l = fStruct->topLevel; + tn = fStruct->top; + while (l > 0 && tn) + { + x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) & + YAFFS_TNODES_INTERNAL_MASK; + + //T((TSTR(" [%d:%d]"),l,i)); + + if(!tn->internal[x]) + { + //T((TSTR(" added"))); + + tn->internal[x] = yaffs_GetTnode(dev); + } + + tn = tn->internal[x]; + l--; + + } + + //TSTR(TENDSTR))); + + return tn; +} + +// DeleteWorker scans backwards through the tnode tree and deletes all the +// chunks and tnodes in the file +// Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete. + +static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit) +{ + int i; + int chunkInInode; + int theChunk; + yaffs_Tags tags; + int found; + int chunkDeleted; + int allDone = 1; + + + if(tn) + { + if(level > 0) + { + + for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--) + { + if(tn->internal[i]) + { + if(limit && (*limit) < 0) + { + allDone = 0; + } + else + { + allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1, + (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit); + } + if(allDone) + { + yaffs_FreeTnode(in->myDev,tn->internal[i]); + tn->internal[i] = NULL; + } + } + + } + return (allDone) ? 1 : 0; + } + else if(level == 0) + { + for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) //NB Don't apply the limit here, always delete a whole level0 + { + if(tn->level0[i]) + { + int j; + + chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i; + + theChunk = tn->level0[i] << in->myDev->chunkGroupBits; + + // Now we need to search for it + for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++) + { + yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted); + if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + + } + else + { + theChunk++; + } + } + + if(found) + { + yaffs_DeleteChunk(in->myDev,theChunk); + in->nDataChunks--; + if(limit) + { + *limit = *limit-1; + } + + } + + tn->level0[i] = 0; + } + + } + return 1; + + + } + + } + + return 1; + +} + + + + +// Pruning removes any part of the file structure tree that is beyond the +// bounds of the file (ie that does not point to chunks). +// +// A file should only get pruned when its size is reduced. +// +// Before pruning, the chunks must be pulled from the tree and the +// level 0 tnode entries must be zeroed out. +// Could also use this for file deletion, but that's probably better handled +// by a special case. + +// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure() + +static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0) +{ + int i; + int hasData; + + if(tn) + { + hasData = 0; + + for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++) + { + if(tn->internal[i] && level > 0) + { + tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1); + } + + if(tn->internal[i]) + { + hasData++; + } + } + + if(hasData == 0 && del0) + { + // Free and return NULL + + yaffs_FreeTnode(dev,tn); + tn = NULL; + } + + } + + return tn; + +} + +static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct) +{ + int i; + int hasData; + int done = 0; + yaffs_Tnode *tn; + + if(fStruct->topLevel > 0) + { + fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0); + + // Now we have a tree with all the non-zero branches NULL but the height + // is the same as it was. + // Let's see if we can trim internal tnodes to shorten the tree. + // We can do this if only the 0th element in the tnode is in use + // (ie all the non-zero are NULL) + + while(fStruct->topLevel && !done) + { + tn = fStruct->top; + + hasData = 0; + for(i = 1; i internal[i]) + { + hasData++; + } + } + + if(!hasData) + { + fStruct->top = tn->internal[0]; + fStruct->topLevel--; + yaffs_FreeTnode(dev,tn); + } + else + { + done = 1; + } + } + } + + return YAFFS_OK; +} + + + + + +/////////////////////// End of File Structure functions. ///////////////// + +// yaffs_CreateFreeObjects creates a bunch more objects and +// adds them to the object free list. +static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects) +{ + int i; + yaffs_Object *newObjects; + yaffs_ObjectList *list; + + if(nObjects < 1) return YAFFS_OK; + + // make these things + + newObjects = YMALLOC(nObjects * sizeof(yaffs_Object)); + + if (!newObjects) + { + T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR))); + return YAFFS_FAIL; + } + + // Hook them into the free list + for(i = 0; i < nObjects - 1; i++) + { + (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1]; + } + + newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects; + dev->freeObjects = newObjects; + dev->nFreeObjects+= nObjects; + dev->nObjectsCreated+= nObjects; + + // Now add this bunch of Objects to a list for freeing up. + + list = YMALLOC(sizeof(yaffs_ObjectList)); + if(!list) + { + T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR))); + } + else + { + list->objects = newObjects; + list->next = dev->allocatedObjectList; + dev->allocatedObjectList = list; + } + + + + return YAFFS_OK; +} + + +// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out +static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev) +{ + yaffs_Object *tn = NULL; + + // If there are none left make more + if(!dev->freeObjects) + { + yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS); + } + + if(dev->freeObjects) + { + tn = dev->freeObjects; + dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next); + dev->nFreeObjects--; + + // Now sweeten it up... + + memset(tn,0,sizeof(yaffs_Object)); + tn->myDev = dev; + tn->chunkId = -1; + tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN; + INIT_LIST_HEAD(&(tn->hardLinks)); + INIT_LIST_HEAD(&(tn->hashLink)); + INIT_LIST_HEAD(&tn->siblings); + + // Add it to the lost and found directory. + // NB Can't put root or lostNFound in lostNFound so + // check if lostNFound exists first + if(dev->lostNFoundDir) + { + yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn); + } + } + + + return tn; +} + +static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode) +{ + + yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY); + if(obj) + { + obj->fake = 1; // it is fake so it has no NAND presence... + obj->renameAllowed= 0; // ... and we're not allowed to rename it... + obj->unlinkAllowed= 0; // ... or unlink it + obj->deleted = 0; + obj->unlinked = 0; + obj->st_mode = mode; + obj->myDev = dev; + obj->chunkId = 0; // Not a valid chunk. + } + + return obj; + +} + + +static void yaffs_UnhashObject(yaffs_Object *tn) +{ + int bucket; + yaffs_Device *dev = tn->myDev; + + + // If it is still linked into the bucket list, free from the list + if(!list_empty(&tn->hashLink)) + { + list_del_init(&tn->hashLink); + bucket = yaffs_HashFunction(tn->objectId); + dev->objectBucket[bucket].count--; + } + +} + + +// FreeObject frees up a Object and puts it back on the free list +static void yaffs_FreeObject(yaffs_Object *tn) +{ + + yaffs_Device *dev = tn->myDev; + + yaffs_UnhashObject(tn); + + // Link into the free list. + (yaffs_Object *)(tn->siblings.next) = dev->freeObjects; + dev->freeObjects = tn; + dev->nFreeObjects++; +} + + + + +static void yaffs_DeinitialiseObjects(yaffs_Device *dev) +{ + // Free the list of allocated Objects + + while( dev->allocatedObjectList) + { + YFREE(dev->allocatedObjectList->objects); + dev->allocatedObjectList = dev->allocatedObjectList->next; + } + + dev->freeObjects = NULL; + dev->nFreeObjects = 0; +} + +static void yaffs_InitialiseObjects(yaffs_Device *dev) +{ + int i; + + dev->allocatedObjectList = NULL; + dev->freeObjects = NULL; + dev->nFreeObjects = 0; + + for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) + { + INIT_LIST_HEAD(&dev->objectBucket[i].list); + dev->objectBucket[i].count = 0; + } + +} + + + + + + +int yaffs_FindNiceObjectBucket(yaffs_Device *dev) +{ + static int x = 0; + int i; + int l = 999; + int lowest = 999999; + + + // First let's see if we can find one that's empty. + + for(i = 0; i < 10 && lowest > 0; i++) + { + x++; + x %= YAFFS_NOBJECT_BUCKETS; + if(dev->objectBucket[x].count < lowest) + { + lowest = dev->objectBucket[x].count; + l = x; + } + + } + + // If we didn't find an empty list, then try + // looking a bit further for a short one + + for(i = 0; i < 10 && lowest > 3; i++) + { + x++; + x %= YAFFS_NOBJECT_BUCKETS; + if(dev->objectBucket[x].count < lowest) + { + lowest = dev->objectBucket[x].count; + l = x; + } + + } + + return l; +} + +static int yaffs_CreateNewObjectNumber(yaffs_Device *dev) +{ + int bucket = yaffs_FindNiceObjectBucket(dev); + + // Now find an object value that has not already been taken + // by scanning the list. + + int found = 0; + struct list_head *i; + + __u32 n = (__u32)bucket; + + //yaffs_CheckObjectHashSanity(); + + while(!found) + { + found = 1; + n += YAFFS_NOBJECT_BUCKETS; + if(1 ||dev->objectBucket[bucket].count > 0) + { + list_for_each(i,&dev->objectBucket[bucket].list) + { + // If there is already one in the list + if(list_entry(i, yaffs_Object,hashLink)->objectId == n) + { + found = 0; + } + } + } + } + + //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n); + + return n; +} + +void yaffs_HashObject(yaffs_Object *in) +{ + int bucket = yaffs_HashFunction(in->objectId); + yaffs_Device *dev = in->myDev; + + if(!list_empty(&in->hashLink)) + { + //YINFO("!!!"); + } + + + list_add(&in->hashLink,&dev->objectBucket[bucket].list); + dev->objectBucket[bucket].count++; + +} + +yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number) +{ + int bucket = yaffs_HashFunction(number); + struct list_head *i; + yaffs_Object *in; + + list_for_each(i,&dev->objectBucket[bucket].list) + { + // Look if it is in the list + in = list_entry(i, yaffs_Object,hashLink); + if(in->objectId == number) + { + return in; + } + } + + return NULL; +} + + + +yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type) +{ + + yaffs_Object *theObject; + + if(number < 0) + { + number = yaffs_CreateNewObjectNumber(dev); + } + + theObject = yaffs_AllocateEmptyObject(dev); + + if(theObject) + { + theObject->fake = 0; + theObject->renameAllowed = 1; + theObject->unlinkAllowed = 1; + theObject->objectId = number; + yaffs_HashObject(theObject); + theObject->variantType = type; +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(theObject->win_atime); + theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0]; + theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1]; + +#else + theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME; +#endif + switch(type) + { + case YAFFS_OBJECT_TYPE_FILE: + theObject->variant.fileVariant.fileSize = 0; + theObject->variant.fileVariant.scannedFileSize = 0; + theObject->variant.fileVariant.topLevel = 0; + theObject->variant.fileVariant.top = yaffs_GetTnode(dev); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + INIT_LIST_HEAD(&theObject->variant.directoryVariant.children); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + // No action required + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + // No action required + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + // No action required + break; + case YAFFS_OBJECT_TYPE_UNKNOWN: + // todo this should not happen + break; + } + } + + return theObject; +} + +yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type) +{ + yaffs_Object *theObject = NULL; + + if(number > 0) + { + theObject = yaffs_FindObjectByNumber(dev,number); + } + + if(!theObject) + { + theObject = yaffs_CreateNewObject(dev,number,type); + } + + return theObject; + +} + +char *yaffs_CloneString(const char *str) +{ + char *newStr = NULL; + + if(str && *str) + { + newStr = YMALLOC(strlen(str) + 1); + strcpy(newStr,str); + } + + return newStr; + +} + +// +// Mknod (create) a new object. +// equivalentObject only has meaning for a hard link; +// aliasString only has meaning for a sumlink. +// rdev only has meaning for devices (a subset of special objects) +yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type, + yaffs_Object *parent, + const char *name, + __u32 mode, + __u32 uid, + __u32 gid, + yaffs_Object *equivalentObject, + const char *aliasString, + __u32 rdev) +{ + yaffs_Object *in; + + yaffs_Device *dev = parent->myDev; + + // Check if the entry exists. If it does then fail the call since we don't want a dup. + if(yaffs_FindObjectByName(parent,name)) + { + return NULL; + } + + in = yaffs_CreateNewObject(dev,-1,type); + + if(in) + { + in->chunkId = -1; + in->valid = 1; + in->variantType = type; + + in->st_mode = mode; + +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(in->win_atime); + in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0]; + in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0]; + +#else + in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME; + in->st_rdev = rdev; + in->st_uid = uid; + in->st_gid = gid; +#endif + in->nDataChunks = 0; + + yaffs_SetObjectName(in,name); + in->dirty = 1; + + yaffs_AddObjectToDirectory(parent,in); + + in->myDev = parent->myDev; + + + switch(type) + { + case YAFFS_OBJECT_TYPE_SYMLINK: + in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardLinkVariant.equivalentObject = equivalentObject; + in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId; + list_add(&in->hardLinks,&equivalentObject->hardLinks); + break; + case YAFFS_OBJECT_TYPE_FILE: // do nothing + case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing + case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing + case YAFFS_OBJECT_TYPE_UNKNOWN: + break; + } + + if(yaffs_GetNumberOfFreeChunks(dev) <= 0 || + yaffs_UpdateObjectHeader(in,name,0) < 0) + { + // Could not create the object header, fail the creation + yaffs_UnlinkWorker(in); + in = NULL; + } + + } + + return in; +} + +yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0); +} + +yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0); +} + +yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev); +} + +yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias) +{ + return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0); +} + +// NB yaffs_Link returns the object id of the equivalent object. +yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject) +{ + // Get the real object in case we were fed a hard link as an equivalent object + equivalentObject = yaffs_GetEquivalentObject(equivalentObject); + + if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0)) + { + return equivalentObject; + } + else + { + return NULL; + } + +} + + +static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force) +{ + int unlinkOp; + + if(newDir == NULL) + { + newDir = obj->parent; // use the old directory + } + + unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE); + + // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since + // duplicate names are allowed. + // Otherwise only proceed if the new name does not exist and if we're putting it into a directory. + if( (unlinkOp|| + force || + !yaffs_FindObjectByName(newDir,newName)) && + newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) + { + yaffs_SetObjectName(obj,newName); + obj->dirty = 1; + + yaffs_AddObjectToDirectory(newDir,obj); + + if(unlinkOp) obj->unlinked = 1; + + + if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0) + { + return YAFFS_OK; + } + } + + return YAFFS_FAIL; +} + + + +int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName) +{ + yaffs_Object *obj; + int force = 0; + +#ifdef CONFIG_YAFFS_WINCE + // Special case for WinCE. + // While look-up is case insensitive, the name isn't. + // THerefore we might want to change x.txt to X.txt + if(oldDir == newDir && _stricmp(oldName,newName) == 0) + { + force = 1; + } +#endif + + obj = yaffs_FindObjectByName(oldDir,oldName); + if(obj && obj->renameAllowed) + { + return yaffs_ChangeObjectName(obj,newDir,newName,force); + } + return YAFFS_FAIL; +} + + + +static int yaffs_CheckObjectHashSanity(yaffs_Device *dev) +{ + // Scan the buckets and check that the lists + // have as many members as the count says there are + int bucket; + int countEm; + struct list_head *j; + int ok = YAFFS_OK; + + for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++) + { + countEm = 0; + + list_for_each(j,&dev->objectBucket[bucket].list) + { + countEm++; + } + + if(countEm != dev->objectBucket[bucket].count) + { + T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR))); + ok = YAFFS_FAIL; + } + } + + return ok; +} + +#if 0 +void yaffs_ObjectTest(yaffs_Device *dev) +{ + yaffs_Object *in[1000]; + int inNo[1000]; + yaffs_Object *inold[1000]; + int i; + int j; + + memset(in,0,1000*sizeof(yaffs_Object *)); + memset(inold,0,1000*sizeof(yaffs_Object *)); + + yaffs_CheckObjectHashSanity(dev); + + for(j = 0; j < 10; j++) + { + //T(("%d\n",j)); + + for(i = 0; i < 1000; i++) + { + in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE); + if(!in[i]) + { + YINFO("No more inodes"); + } + else + { + inNo[i] = in[i]->objectId; + } + } + + for(i = 0; i < 1000; i++) + { + if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i]) + { + //T(("Differnce in look up test\n")); + } + else + { + // T(("Look up ok\n")); + } + } + + yaffs_CheckObjectHashSanity(dev); + + for(i = 0; i < 1000; i+=3) + { + yaffs_FreeObject(in[i]); + in[i] = NULL; + } + + + yaffs_CheckObjectHashSanity(dev); + } + +} + +#endif + +/////////////////////////// Block Management and Page Allocation /////////////////// + + +static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks) +{ + dev->allocationBlock = -1; // force it to get a new one + //Todo we're assuming the malloc will pass. + dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo)); + if(dev->blockInfo) + { + memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo)); + return YAFFS_OK; + } + return YAFFS_FAIL; + +} + +static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) +{ + YFREE(dev->blockInfo); +} + +// FindDiretiestBlock is used to select the dirtiest block (or close enough) +// for garbage collection. + +static int yaffs_FindDirtiestBlock(yaffs_Device *dev) +{ + + int b = dev->currentDirtyChecker; + + int i; + int dirtiest = -1; + int pagesInUse = 100; // silly big number + yaffs_BlockInfo *bi; + + for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++) + { + b++; + if ( b < dev->startBlock || b > dev->endBlock) + { + b = dev->startBlock; + } + + if(b < dev->startBlock || b > dev->endBlock) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b)); + YBUG(); + } + + bi = yaffs_GetBlockInfo(dev,b); + + if(bi->blockState == YAFFS_BLOCK_STATE_FULL && + bi->pagesInUse < pagesInUse) + { + dirtiest = b; + pagesInUse = bi->pagesInUse; + } + } + + dev->currentDirtyChecker = b; + + return dirtiest; +} + + +static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo) +{ + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo); + + int erasedOk = 0; + + // If the block is still healthy erase it and mark as clean. + // If the block has had a data failure, then retire it. + bi->blockState = YAFFS_BLOCK_STATE_DIRTY; + + if(!bi->needsRetiring) + { + erasedOk = yaffs_EraseBlockInNAND(dev,blockNo); + if(!erasedOk) + { + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo)); + } + } + + if( erasedOk ) + { + bi->blockState = YAFFS_BLOCK_STATE_EMPTY; + dev->nErasedBlocks++; + bi->pagesInUse = 0; + bi->pageBits = 0; + + T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo)); + } + else + { + yaffs_RetireBlock(dev,blockNo); + T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo)); + } +} + + +static int yaffs_FindBlockForAllocation(yaffs_Device *dev) +{ + int i; + yaffs_BlockInfo *bi; + + if(dev->nErasedBlocks < 1) + { + // Hoosterman we've got a problem. + // Can't get space to gc + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during gc" TENDSTR))); + + return -1; + } + + // Find an empty block. + + for(i = dev->startBlock; i <= dev->endBlock; i++) + { + bi = yaffs_GetBlockInfo(dev,i); + if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY) + { + bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING; + dev->nErasedBlocks--; + return i; + } + } + + return -1; +} + + + +static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve) +{ + int retVal; + yaffs_BlockInfo *bi; + + if(dev->allocationBlock < 0) + { + // Get next block to allocate off + dev->allocationBlock = yaffs_FindBlockForAllocation(dev); + dev->allocationPage = 0; + } + + if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) + { + // Not enough space to allocate unless we're allowed to use the reserve. + return -1; + } + + // Next page please.... + if(dev->allocationBlock >= 0) + { + bi = yaffs_GetBlockInfo(dev,dev->allocationBlock); + + retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + + dev->allocationPage; + bi->pagesInUse++; + bi->pageBits |= (1 << (dev->allocationPage)); + + dev->allocationPage++; + + dev->nFreeChunks--; + + // If the block is full set the state to full + if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK) + { + bi->blockState = YAFFS_BLOCK_STATE_FULL; + dev->allocationBlock = -1; + } + + + return retVal; + + } + T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); + + return -1; +} + +// To determine if we have enough space we just look at the +// number of erased blocks. +// The cache is allowed to use reserved blocks. + +int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev) +{ + return (dev->nErasedBlocks >= YAFFS_RESERVED_BLOCKS); +} + + +int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block) +{ + int oldChunk; + int newChunk; + __u32 mask; + + + yaffs_Spare spare; + yaffs_Tags tags; + __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + + yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block); + + yaffs_Object *object; + + //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits)); + + for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK; + mask && bi->pageBits; + mask <<= 1, oldChunk++ ) + { + if(bi->pageBits & mask) + { + + // This page is in use and needs to be copied off + + dev->nGCCopies++; + + //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk)); + + yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1); + + yaffs_GetTagsFromSpare(dev,&spare,&tags); + + object = yaffs_FindObjectByNumber(dev,tags.objectId); + + if(object && object->deleted && tags.chunkId != 0) + { + // Data chunk in a deleted file, throw it away + // It's a deleted data chunk, + // No need to copy this, just forget about it and fix up the + // object. + + yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0); + object->nDataChunks--; + } + else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */) + { + // Deleted object header with no data chunks. + // Can be discarded + object->chunkId = 0; + //Todo some clean up + + } + else if(object) + { + // It's either a data chunk in a live file or + // an ObjectHeader, so we're interested in it. + // NB Need to keep the ObjectHeaders of deleted files + // until the whole file has been deleted off + tags.serialNumber++; + yaffs_LoadTagsIntoSpare(&spare,&tags); + + + newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1); + + if(newChunk < 0) + { + return YAFFS_FAIL; + } + + // Ok, now fix up the Tnodes etc. + + if(tags.chunkId == 0) + { + // It's a header + object->chunkId = newChunk; + } + else + { + // It's a data chunk + yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0); + } + } + + yaffs_DeleteChunk(dev,oldChunk); + + } + } + + return YAFFS_OK; +} + + +static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev) +{ + // todo find a file to delete + struct list_head *i; + yaffs_Object *l; + + + // To the free chunks add the chunks that are in the deleted unlinked files. + list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + if(l->deleted) + { + return l; + } + } + return NULL; +} + +static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev) +{ + // This does background deletion on unlinked files.. only deleted ones. + // If we don't have a file we're working on then find one + if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0) + { + dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev); + } + + // OK, we're working on a file... + if(dev->unlinkedDeletion) + { + yaffs_Object *obj = dev->unlinkedDeletion; + int delresult; + int limit; // Number of chunks to delete in a file. + // NB this can be exceeded, but not by much. + + limit = 5; +#if 0 + if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER)) + { + limit = 50; // Doing GC soon, so dig deeper + } + else + { + limit = 5; + } +#endif + + delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit); + + if(obj->nDataChunks == 0) + { + // Done all the deleting of data chunks. + // Now dump the header and clean up + yaffs_FreeTnode(dev,obj->variant.fileVariant.top); + yaffs_DoGenericObjectDeletion(obj); + dev->nDeletedFiles--; + dev->nUnlinkedFiles--; + dev->nBackgroundDeletions++; + dev->unlinkedDeletion = NULL; + } + } +} + + + +static int yaffs_CheckGarbageCollection(yaffs_Device *dev) +{ + int block; + + yaffs_DoUnlinkedFileDeletion(dev); + + if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER)) + { + dev->garbageCollectionRequired = 1; + } + + if(dev->garbageCollectionRequired) + { + dev->garbageCollections++; + dev->garbageCollectionRequired = 0; + if(dev->blockSelectedForGC >= 0) + { + block = dev->blockSelectedForGC; + } + else + { + block = yaffs_FindDirtiestBlock(dev); + } + + if(block >= 0) + { + return yaffs_GarbageCollectBlock(dev,block); + } + else + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; +} + + +//////////////////////////// TAGS /////////////////////////////////////// + +static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr) +{ + yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; + + yaffs_CalcTagsECC(tagsPtr); + + sparePtr->tagByte0 = tu->asBytes[0]; + sparePtr->tagByte1 = tu->asBytes[1]; + sparePtr->tagByte2 = tu->asBytes[2]; + sparePtr->tagByte3 = tu->asBytes[3]; + sparePtr->tagByte4 = tu->asBytes[4]; + sparePtr->tagByte5 = tu->asBytes[5]; + sparePtr->tagByte6 = tu->asBytes[6]; + sparePtr->tagByte7 = tu->asBytes[7]; +} + +static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr) +{ + yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; + int result; + + tu->asBytes[0]= sparePtr->tagByte0; + tu->asBytes[1]= sparePtr->tagByte1; + tu->asBytes[2]= sparePtr->tagByte2; + tu->asBytes[3]= sparePtr->tagByte3; + tu->asBytes[4]= sparePtr->tagByte4; + tu->asBytes[5]= sparePtr->tagByte5; + tu->asBytes[6]= sparePtr->tagByte6; + tu->asBytes[7]= sparePtr->tagByte7; + + result = yaffs_CheckECCOnTags(tagsPtr); + if(result> 0) + { + dev->tagsEccFixed++; + } + else if(result <0) + { + dev->tagsEccUnfixed++; + } +} + +static void yaffs_SpareInitialise(yaffs_Spare *spare) +{ + memset(spare,0xFF,sizeof(yaffs_Spare)); +} + +static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted) +{ + if(tags) + { + yaffs_Spare spare; + if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK) + { + *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0; + yaffs_GetTagsFromSpare(dev,&spare,tags); + return YAFFS_OK; + } + else + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; +} + +#if 0 +static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags) +{ + // NB There must be tags, data is optional + // If there is data, then an ECC is calculated on it. + + yaffs_Spare spare; + + if(!tags) + { + return YAFFS_FAIL; + } + + yaffs_SpareInitialise(&spare); + +#ifndef CONFIG_YAFFS_USE_NANDECC + if(buffer) + { + yaffs_CalcECC(buffer,&spare); + } +#endif + + yaffs_LoadTagsIntoSpare(&spare,tags); + + return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare); + +} +#endif + + +static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve) +{ + // NB There must be tags, data is optional + // If there is data, then an ECC is calculated on it. + + yaffs_Spare spare; + + if(!tags) + { + return YAFFS_FAIL; + } + + yaffs_SpareInitialise(&spare); + +#ifndef CONFIG_YAFFS_USE_NANDECC + + if(buffer) + { + yaffs_CalcECC(buffer,&spare); + } +#endif + + yaffs_LoadTagsIntoSpare(&spare,tags); + + return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve); + +} + +static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted) +{ + return ( tags->chunkId == chunkInObject && + tags->objectId == objectId && + !chunkDeleted) ? 1 : 0; + +} + + + +int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) +{ + //Get the Tnode, then get the level 0 offset chunk offset + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_Tags localTags; + int i; + int found = 0; + int chunkDeleted; + + yaffs_Device *dev = in->myDev; + + + if(!tags) + { + // Passed a NULL, so use our own tags space + tags = &localTags; + } + + tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + + if(tn) + { + theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; + + // Now we need to do the shifting etc and search for it + for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) + { + yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + } + else + { + theChunk++; + } + } + } + return found ? theChunk : -1; +} + +int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags) +{ + //Get the Tnode, then get the level 0 offset chunk offset + yaffs_Tnode *tn; + int theChunk = -1; + yaffs_Tags localTags; + int i; + int found = 0; + yaffs_Device *dev = in->myDev; + int chunkDeleted; + + if(!tags) + { + // Passed a NULL, so use our own tags space + tags = &localTags; + } + + tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + + if(tn) + { + + theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits; + + // Now we need to do the shifting etc and search for it + for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++) + { + yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted)) + { + // found it; + found = 1; + } + else + { + theChunk++; + } + } + + // Delete the entry in the filestructure + if(found) + { + tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0; + } + } + else + { + //T(("No level 0 found for %d\n", chunkInInode)); + } + + if(!found) + { + //T(("Could not find %d to delete\n",chunkInInode)); + } + return found ? theChunk : -1; +} + + +#ifdef YAFFS_PARANOID + +static int yaffs_CheckFileSanity(yaffs_Object *in) +{ + int chunk; + int nChunks; + int fSize; + int failed = 0; + int objId; + yaffs_Tnode *tn; + yaffs_Tags localTags; + yaffs_Tags *tags = &localTags; + int theChunk; + int chunkDeleted; + + + if(in->variantType != YAFFS_OBJECT_TYPE_FILE) + { + //T(("Object not a file\n")); + return YAFFS_FAIL; + } + + objId = in->objectId; + fSize = in->variant.fileVariant.fileSize; + nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK; + + for(chunk = 1; chunk <= nChunks; chunk++) + { + tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk); + + if(tn) + { + + theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits; + + + yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted); + if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted)) + { + // found it; + + } + else + { + //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n", + // objId,chunk,theChunk,tags->chunkId,tags->objectId); + + failed = 1; + + } + + } + else + { + //T(("No level 0 found for %d\n", chunk)); + } + } + + return failed ? YAFFS_FAIL : YAFFS_OK; +} + +#endif + +static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan) +{ + yaffs_Tnode *tn; + yaffs_Device *dev = in->myDev; + int existingChunk; + yaffs_Tags existingTags; + yaffs_Tags newTags; + unsigned existingSerial, newSerial; + + int newChunkDeleted; + + + tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode); + if(!tn) + { + return YAFFS_FAIL; + } + + existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK]; + + if(inScan) + { + // If we're scanning then we need to test for duplicates + // NB This does not need to be efficient since it should only ever + // happen when the power fails during a write, then only one + // chunk should ever be affected. + + + if(existingChunk != 0) + { + // NB Right now existing chunk will not be real chunkId if the device >= 32MB + // thus we have to do a FindChunkInFile to get the real chunk id. + // + // We have a duplicate now we need to decide which one to use + // To do this we get both sets of tags and compare serial numbers. + yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted); + + + // Do a proper find + existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags); + + if(existingChunk <=0) + { + //Hoosterman - how did this happen? + + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: existing chunk < 0 in scan" TENDSTR))); + + } + + + // NB The deleted flags should be false, otherwise the chunks will + // not be loaded during a scan + + newSerial = newTags.serialNumber; + existingSerial = existingTags.serialNumber; + + if( existingChunk <= 0 || + ((existingSerial+1) & 3) == newSerial) + { + // Use new + // Delete the old one and drop through to update the tnode + yaffs_DeleteChunk(dev,existingChunk); + } + else + { + // Use existing. + // Delete the new one and return early so that the tnode isn't changed + yaffs_DeleteChunk(dev,chunkInNAND); + return YAFFS_OK; + } + } + + } + + if(existingChunk == 0) + { + in->nDataChunks++; + } + + tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits); + + return YAFFS_OK; +} + + + +int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer) +{ + int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL); + + if(chunkInNAND >= 0) + { + return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1); + } + else + { + return 0; + } + +} + + +static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId) +{ + int block; + int page; + yaffs_Spare spare; + yaffs_BlockInfo *bi; + + if(chunkId <= 0) return; + + block = chunkId / YAFFS_CHUNKS_PER_BLOCK; + page = chunkId % YAFFS_CHUNKS_PER_BLOCK; + yaffs_SpareInitialise(&spare); + + spare.pageStatus = 0; // To mark it as deleted. + + + yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare); + yaffs_HandleUpdateChunk(dev,chunkId,&spare); + bi = yaffs_GetBlockInfo(dev,block); + + + // Pull out of the management area. + // If the whole block became dirty, this will kick off an erasure. + if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || + bi->blockState == YAFFS_BLOCK_STATE_FULL) + { + dev->nFreeChunks++; + + bi->pageBits &= ~(1 << page); + bi->pagesInUse--; + + if(bi->pagesInUse == 0 && + bi->blockState == YAFFS_BLOCK_STATE_FULL) + { + yaffs_BlockBecameDirty(dev,block); + } + + } + else + { + // T(("Bad news deleting chunk %d\n",chunkId)); + } + +} + + + + +int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve) +{ + // Find old chunk Need to do this to get serial number + // Write new one and patch into tree. + // Invalidate old tags. + + int prevChunkId; + yaffs_Tags prevTags; + + int newChunkId; + yaffs_Tags newTags; + + yaffs_Device *dev = in->myDev; + + yaffs_CheckGarbageCollection(dev); + + // Get the previous chunk at this location in the file if it exists + prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags); + + // Set up new tags + newTags.chunkId = chunkInInode; + newTags.objectId = in->objectId; + newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1; + newTags.byteCount = nBytes; + newTags.unusedStuff = 0xFFFFFFFF; + + yaffs_CalcTagsECC(&newTags); + + newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve); + if(newChunkId >= 0) + { + yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0); + + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + + } + + yaffs_CheckFileSanity(in); + } + return newChunkId; + + + + + +} + + +// UpdateObjectHeader updates the header on NAND for an object. +// If name is not NULL, then that new name is used. +// +int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force) +{ + + yaffs_Device *dev = in->myDev; + + int prevChunkId; + + int newChunkId; + yaffs_Tags newTags; + __u8 bufferNew[YAFFS_BYTES_PER_CHUNK]; + __u8 bufferOld[YAFFS_BYTES_PER_CHUNK]; + + yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew; + yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld; + + + if(!in->fake || force) + { + + yaffs_CheckGarbageCollection(dev); + + memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK); + + prevChunkId = in->chunkId; + + if(prevChunkId >= 0) + { + yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1); + } + + // Header data + oh->type = in->variantType; + + oh->st_mode = in->st_mode; + +#ifdef CONFIG_YAFFS_WINCE + oh->win_atime[0] = in->win_atime[0]; + oh->win_ctime[0] = in->win_ctime[0]; + oh->win_mtime[0] = in->win_mtime[0]; + oh->win_atime[1] = in->win_atime[1]; + oh->win_ctime[1] = in->win_ctime[1]; + oh->win_mtime[1] = in->win_mtime[1]; +#else + oh->st_uid = in->st_uid; + oh->st_gid = in->st_gid; + oh->st_atime = in->st_atime; + oh->st_mtime = in->st_mtime; + oh->st_ctime = in->st_ctime; + oh->st_rdev = in->st_rdev; +#endif + if(in->parent) + { + oh->parentObjectId = in->parent->objectId; + } + else + { + oh->parentObjectId = 0; + } + + //oh->sum = in->sum; + if(name && *name) + { + memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); + strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH); + } + else if(prevChunkId) + { + memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1); + } + else + { + memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); + } + + switch(in->variantType) + { + case YAFFS_OBJECT_TYPE_UNKNOWN: + // Should not happen + break; + case YAFFS_OBJECT_TYPE_FILE: + oh->fileSize = in->variant.fileVariant.fileSize; + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId; + break; + case YAFFS_OBJECT_TYPE_SPECIAL: + // Do nothing + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + // Do nothing + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH); + oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; + break; + } + + // Tags + in->serial++; + newTags.chunkId = 0; + newTags.objectId = in->objectId; + newTags.serialNumber = in->serial; + newTags.byteCount = 0xFFFFFFFF; + newTags.unusedStuff = 0xFFFFFFFF; + + yaffs_CalcTagsECC(&newTags); + + + // Create new chunk in NAND + newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1); + + if(newChunkId >= 0) + { + + in->chunkId = newChunkId; + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId); + } + + in->dirty = 0; + } + + return newChunkId; + + } + return 0; +} + + +/////////////////////// Short Operations Cache //////////////////////////////// +// In many siturations where there is no high level buffering (eg WinCE) a lot of +// reads might be short sequential reads, and a lot of writes may be short +// sequential writes. eg. scanning/writing a jpeg file. +// In these cases, a short read/write cache can provide a huge perfomance benefit +// with dumb-as-a-rock code. +// There are a limited number (~10) of cache chunks per device so that we don't +// need a very intelligent search. + + +#ifdef CONFIG_YAFFS_SHORT_OP_CACHE + + +static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) +{ + yaffs_Device *dev = obj->myDev; + int lowest; + int i; + yaffs_ChunkCache *cache; + int chunkWritten; + int nBytes; + + do{ + cache = NULL; + + // Find the dirty cache for this object with the lowest chunk id. + for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if(dev->srCache[i].object == obj && + dev->srCache[i].dirty) + { + if(!cache || dev->srCache[i].chunkId < lowest) + { + cache = &dev->srCache[i]; + lowest = cache->chunkId; + } + } + } + + if(cache) + { + //Write it out + + nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK); + + if(nBytes > YAFFS_BYTES_PER_CHUNK) + { + nBytes= YAFFS_BYTES_PER_CHUNK; + } + + chunkWritten = yaffs_WriteChunkDataToObject(cache->object, + cache->chunkId, + cache->data, + nBytes,1); + + cache->dirty = 0; + } + + } while(cache && chunkWritten > 0); + + if(cache) + { + //Hoosterman, disk full while writing cache out. + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during caceh write" TENDSTR))); + + } + +} + + +// Grab us a chunk for use. +// First look for an empty one. +// Then look for the least recently used non-dirty one. +// Then look for the least recently used dirty one...., flush and look again. +static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev) +{ + int i; + int usage; + int theOne; + + for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if(!dev->srCache[i].object) + { + //T(("Grabbing empty %d\n",i)); + + return &dev->srCache[i]; + } + } + + theOne = -1; + usage = 0; // just to stop the compiler grizzling + + for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if(!dev->srCache[i].dirty && + ((dev->srCache[i].lastUse < usage && theOne >= 0)|| + theOne < 0)) + { + usage = dev->srCache[i].lastUse; + theOne = i; + } + } + + //T(("Grabbing non-empty %d\n",theOne)); + return theOne >= 0 ? &dev->srCache[theOne] : NULL; + +} + + +static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) +{ + yaffs_ChunkCache *cache; + yaffs_Object *theObj; + int usage; + int i; + + // Try find a non-dirty one... + + cache = yaffs_GrabChunkCacheWorker(dev); + + if(!cache) + { + // They were all dirty, find the last recently used object and flush + // its cache, then find again. + // NB what's here is not very accurate, we actually flush the object + // the last recently used page. + + theObj = dev->srCache[0].object; + usage = dev->srCache[0].lastUse; + + for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if( dev->srCache[i].object && + dev->srCache[i].lastUse < usage) + { + usage = dev->srCache[i].lastUse; + theObj = dev->srCache[i].object; + } + } + + yaffs_FlushFilesChunkCache(theObj); + + // Try again + cache = yaffs_GrabChunkCacheWorker(dev); + } + + return cache; + +} + + +// Find a cached chunk +static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId) +{ + yaffs_Device *dev = obj->myDev; + int i; + + for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if(dev->srCache[i].object == obj && + dev->srCache[i].chunkId == chunkId) + { + dev->cacheHits++; + + return &dev->srCache[i]; + } + } + + return NULL; +} + +// Mark the chunk for the least recently used algorithym +static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite) +{ + if( dev->srLastUse < 0 || + dev->srLastUse > 100000000) + { + // Reset the cache usages + int i; + for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++) + { + dev->srCache[i].lastUse = 0; + } + dev->srLastUse = 0; + } + + dev->srLastUse++; + + cache->lastUse = dev->srLastUse; + + if(isAWrite) + { + cache->dirty = 1; + } +} + +// Invalidate a single cache page. +// Do this when a whole page gets written, +// ie the short cache for this page is no longer valid. +static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId) +{ + yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId); + + if(cache) + { + cache->object = NULL; + } +} + + +// Invalidate all the cache pages associated with this object +// Do this whenever ther file is deleted or resized. +static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) +{ + int i; + yaffs_Device *dev = in->myDev; + + // Now invalidate it. + for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + if(dev->srCache[i].object == in) + { + dev->srCache[i].object = NULL; + } + } +} + + +#else +// Stubs for disabling short op caching + +static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) +{} + +static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) +{ + return NULL; +} + + +static yaffs_ChunkCache *yaffs_FindChunkCache(yaffs_Device *dev, int objectId, int chunkId) +{ + return NULL; +} + +static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache) +{ +} + +static void yaffs_InvalidateChunkCache(yaffs_Object *obj, int chunkId) +{ +} + +static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in) +{ +} + + + +#endif + + + +///////////////////////// File read/write /////////////////////////////// +// Read and write have very similar structures. +// In general the read/write has three parts to it +// * An incomplete chunk to start with (if the read/write is not chunk-aligned) +// * Some complete chunks +// * An incomplete chunk to end off with +// +// Curve-balls: the first chunk might also be the last chunk. + +int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes) +{ + + + int chunk; + int start; + int nToCopy; + int n = nBytes; + int nDone = 0; + + yaffs_Device *dev; + + dev = in->myDev; + + while(n > 0) + { + chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1 + start = offset % YAFFS_BYTES_PER_CHUNK; + + // OK now check for the curveball where the start and end are in + // the same chunk. + if( (start + n) < YAFFS_BYTES_PER_CHUNK) + { + nToCopy = n; + } + else + { + nToCopy = YAFFS_BYTES_PER_CHUNK - start; + } + + if(nToCopy != YAFFS_BYTES_PER_CHUNK) + { + // An incomplete start or end chunk (or maybe both start and end chunk) +#ifdef CONFIG_YAFFS_SHORT_OP_CACHE + yaffs_ChunkCache *cache; + // If we can't find the data in the cache, then load it up. + cache = yaffs_FindChunkCache(in,chunk); + if(!cache) + { + cache = yaffs_GrabChunkCache(in->myDev); + cache->object = in; + cache->chunkId = chunk; + cache->dirty = 0; + yaffs_ReadChunkDataFromObject(in,chunk,cache->data); + } + + yaffs_UseChunkCache(dev,cache,0); + + memcpy(buffer,&cache->data[start],nToCopy); +#else + // Read into the local buffer then copy... + yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer); + memcpy(buffer,&dev->localBuffer[start],nToCopy); +#endif + } + else + { +#ifdef CONFIG_YAFFS_WINCE + + // Under WinCE can't do direct transfer. Need to use a local buffer. + // This is because we otherwise screw up WinCE's memory mapper + yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer); + memcpy(buffer,dev->localBuffer,YAFFS_BYTES_PER_CHUNK); +#else + // A full chunk. Read directly into the supplied buffer. + yaffs_ReadChunkDataFromObject(in,chunk,buffer); +#endif + } + + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + + } + + return nDone; +} + + + +int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes) +{ + + int chunk; + int start; + int nToCopy; + int n = nBytes; + int nDone = 0; + int nToWriteBack; + int startOfWrite = offset; + int chunkWritten = 0; + int nBytesRead; + + yaffs_Device *dev; + + dev = in->myDev; + + + while(n > 0 && chunkWritten >= 0) + { + chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; + start = offset % YAFFS_BYTES_PER_CHUNK; + + + // OK now check for the curveball where the start and end are in + // the same chunk. + + if( (start + n) < YAFFS_BYTES_PER_CHUNK) + { + nToCopy = n; + + // Now folks, to calculate how many bytes to write back.... + // If we're overwriting and not writing to then end of file then + // we need to write back as much as was there before. + + nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK); + + if(nBytesRead > YAFFS_BYTES_PER_CHUNK) + { + nBytesRead = YAFFS_BYTES_PER_CHUNK; + } + + nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n); + + } + else + { + nToCopy = YAFFS_BYTES_PER_CHUNK - start; + nToWriteBack = YAFFS_BYTES_PER_CHUNK; + } + + if(nToCopy != YAFFS_BYTES_PER_CHUNK) + { + // An incomplete start or end chunk (or maybe both start and end chunk) +#ifdef CONFIG_YAFFS_SHORT_OP_CACHE + yaffs_ChunkCache *cache; + // If we can't find the data in the cache, then load it up. + cache = yaffs_FindChunkCache(in,chunk); + if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev)) + { + cache = yaffs_GrabChunkCache(in->myDev); + cache->object = in; + cache->chunkId = chunk; + cache->dirty = 0; + yaffs_ReadChunkDataFromObject(in,chunk,cache->data); + } + + if(cache) + { + yaffs_UseChunkCache(dev,cache,1); + memcpy(&cache->data[start],buffer,nToCopy); + } + else + { + chunkWritten = -1; // fail the write + } +#else + + + // An incomplete start or end chunk (or maybe both start and end chunk) + // Read into the local buffer then copy, then copy over and write back. + + yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer); + + memcpy(&dev->localBuffer[start],buffer,nToCopy); + + chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,nToWriteBack,0); + + //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack)); +#endif + + } + else + { + +#ifdef CONFIG_YAFFS_WINCE + // Under WinCE can't do direct transfer. Need to use a local buffer. + // This is because we otherwise screw up WinCE's memory mapper + memcpy(dev->localBuffer,buffer,YAFFS_BYTES_PER_CHUNK); + chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,YAFFS_BYTES_PER_CHUNK,0); +#else + // A full chunk. Write directly from the supplied buffer. + chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0); +#endif + // Since we've overwritten the cached data, we better invalidate it. + yaffs_InvalidateChunkCache(in,chunk); + //T(("Write to chunk %d %d\n",chunk,chunkWritten)); + } + + if(chunkWritten >= 0) + { + n -= nToCopy; + offset += nToCopy; + buffer += nToCopy; + nDone += nToCopy; + } + + } + + // Update file object + + if((startOfWrite + nDone) > in->variant.fileVariant.fileSize) + { + in->variant.fileVariant.fileSize = (startOfWrite + nDone); + } + + in->dirty = 1; + + return nDone; +} + + +int yaffs_ResizeFile(yaffs_Object *in, int newSize) +{ + int i; + int chunkId; + int oldFileSize = in->variant.fileVariant.fileSize; + int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK; + + yaffs_Device *dev = in->myDev; + + + yaffs_FlushFilesChunkCache(in); + yaffs_InvalidateWholeChunkCache(in); + + if(in->variantType != YAFFS_OBJECT_TYPE_FILE) + { + return yaffs_GetFileSize(in); + } + + if(newSize < oldFileSize) + { + + int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK; + + int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/ + YAFFS_BYTES_PER_CHUNK; + + // Delete backwards so that we don't end up with holes if + // power is lost part-way through the operation. + for(i = lastDel; i >= startDel; i--) + { + // NB this could be optimised somewhat, + // eg. could retrieve the tags and write them without + // using yaffs_DeleteChunk + + chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL); + if(chunkId <= 0 || chunkId >= (dev->endBlock * 32)) + { + //T(("Found daft chunkId %d for %d\n",chunkId,i)); + } + else + { + in->nDataChunks--; + yaffs_DeleteChunk(dev,chunkId); + } + } + + + if(sizeOfPartialChunk != 0) + { + int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK; + + // Got to read and rewrite the last chunk with its new size. + yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer); + + yaffs_WriteChunkDataToObject(in,lastChunk,dev->localBuffer,sizeOfPartialChunk,1); + + } + + in->variant.fileVariant.fileSize = newSize; + + yaffs_PruneFileStructure(dev,&in->variant.fileVariant); + + return newSize; + + } + else + { + return oldFileSize; + } +} + + +loff_t yaffs_GetFileSize(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + return obj->variant.fileVariant.fileSize; + case YAFFS_OBJECT_TYPE_SYMLINK: + return strlen(obj->variant.symLinkVariant.alias); + default: + return 0; + } +} + + + +// yaffs_FlushFile() updates the file's +// objectId in NAND + +int yaffs_FlushFile(yaffs_Object *in) +{ + int retVal; + if(in->dirty) + { + //T(("flushing object header\n")); + + yaffs_FlushFilesChunkCache(in); + +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(in->win_mtime); +#else + in->st_mtime = CURRENT_TIME; +#endif + + retVal = yaffs_UpdateObjectHeader(in,NULL,0); + } + else + { + retVal = YAFFS_OK; + } + + return retVal; + +} + + +static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) +{ + + // First off, invalidate the file's data in the cache, without flushing. + yaffs_InvalidateWholeChunkCache(in); + + yaffs_RemoveObjectFromDirectory(in); + yaffs_DeleteChunk(in->myDev,in->chunkId); +#ifdef __KERNEL__ + if(in->myInode) + { + in->myInode->u.generic_ip = NULL; + in->myInode = 0; + } +#endif + yaffs_FreeObject(in); + return YAFFS_OK; + +} + +// yaffs_DeleteFile deletes the whole file data +// and the inode associated with the file. +// It does not delete the links associated with the file. +static int yaffs_UnlinkFile(yaffs_Object *in) +{ + +#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION + // Delete the file data & tnodes + + yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL); + + + yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); + + return yaffs_DoGenericObjectDeletion(in); +#else + int retVal; + int immediateDeletion=0; + retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0); + if(retVal == YAFFS_OK) + { + //in->unlinked = 1; + //in->myDev->nUnlinkedFiles++; + //in->renameAllowed = 0; +#ifdef __KERNEL__ + if(in->myInode) + { + immediateDeletion = 1; + + } +#endif +#ifdef CONFIG_YAFFS_WINCE + if(in->inUse <= 0) + { + immediateDeletion = 1; + + } +#endif + + if(immediateDeletion) + { + T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId)); + in->deleted=1; + in->myDev->nDeletedFiles++; + } + + } + return retVal; + + +#endif +} + +int yaffs_DeleteFile(yaffs_Object *in) +{ + int retVal = YAFFS_OK; + if(!in->unlinked) + { + retVal = yaffs_UnlinkFile(in); + } + if(retVal == YAFFS_OK && + in->unlinked && + !in->deleted) + { + in->deleted = 1; + in->myDev->nDeletedFiles++; + } + return in->deleted ? YAFFS_OK : YAFFS_FAIL; +} + +static int yaffs_DeleteDirectory(yaffs_Object *in) +{ + //First check that the directory is empty. + if(list_empty(&in->variant.directoryVariant.children)) + { + return yaffs_DoGenericObjectDeletion(in); + } + + return YAFFS_FAIL; + +} + +static int yaffs_DeleteSymLink(yaffs_Object *in) +{ + YFREE(in->variant.symLinkVariant.alias); + + return yaffs_DoGenericObjectDeletion(in); +} + +static int yaffs_DeleteHardLink(yaffs_Object *in) +{ + // remove this hardlink from the list assocaited with the equivalent + // object + list_del(&in->hardLinks); + return yaffs_DoGenericObjectDeletion(in); +} + + +static int yaffs_UnlinkWorker(yaffs_Object *obj) +{ + + + if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) + { + return yaffs_DeleteHardLink(obj); + } + else if(!list_empty(&obj->hardLinks)) + { + // Curve ball: We're unlinking an object that has a hardlink. + // + // This problem arises because we are not strictly following + // The Linux link/inode model. + // + // We can't really delete the object. + // Instead, we do the following: + // - Select a hardlink. + // - Unhook it from the hard links + // - Unhook it from its parent directory (so that the rename can work) + // - Rename the object to the hardlink's name. + // - Delete the hardlink + + + yaffs_Object *hl; + int retVal; + char name[YAFFS_MAX_NAME_LENGTH+1]; + + hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks); + + list_del_init(&hl->hardLinks); + list_del_init(&hl->siblings); + + yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1); + + retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0); + + if(retVal == YAFFS_OK) + { + retVal = yaffs_DoGenericObjectDeletion(hl); + } + return retVal; + + } + else + { + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + return yaffs_UnlinkFile(obj); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + return yaffs_DeleteDirectory(obj); + break; + case YAFFS_OBJECT_TYPE_SYMLINK: + return yaffs_DeleteSymLink(obj); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + return YAFFS_FAIL; + } + } +} + +int yaffs_Unlink(yaffs_Object *dir, const char *name) +{ + yaffs_Object *obj; + + obj = yaffs_FindObjectByName(dir,name); + + if(obj && obj->unlinkAllowed) + { + return yaffs_UnlinkWorker(obj); + } + + return YAFFS_FAIL; + +} + +//////////////// Initialisation Scanning ///////////////// + + + +// For now we use the SmartMedia check. +// We look at the blockStatus byte in the first two chunks +// These must be 0xFF to pass as OK. +// todo: this function needs to be modifyable foir different NAND types +// and different chunk sizes. Suggest make this into a per-device configurable +// function. +static int yaffs_IsBlockBad(yaffs_Device *dev, int blk) +{ + yaffs_Spare spare; + + yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK,NULL,&spare,1); +#if 1 + if(yaffs_CountBits(spare.blockStatus) < 7) + { + return 1; + } +#else + if(spare.blockStatus != 0xFF) + { + return 1; + } +#endif + yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK + 1,NULL,&spare,1); + +#if 1 + if(yaffs_CountBits(spare.blockStatus) < 7) + { + return 1; + } +#else + if(spare.blockStatus != 0xFF) + { + return 1; + } +#endif + + return 0; + +} + +static int yaffs_Scan(yaffs_Device *dev) +{ + yaffs_Spare spare; + yaffs_Tags tags; + int blk; + int chunk; + int c; + int deleted; + yaffs_BlockState state; + yaffs_Object *hardList = NULL; + yaffs_Object *hl; + yaffs_BlockInfo *bi; + + + yaffs_ObjectHeader *oh; + yaffs_Object *in; + yaffs_Object *parent; + + __u8 chunkData[YAFFS_BYTES_PER_CHUNK]; + + + // Scan all the blocks... + + for(blk = dev->startBlock; blk <= dev->endBlock; blk++) + { + deleted = 0; + bi = yaffs_GetBlockInfo(dev,blk); + bi->pageBits = 0; + bi->pagesInUse = 0; + state = YAFFS_BLOCK_STATE_SCANNING; + + + if(yaffs_IsBlockBad(dev,blk)) + { + state = YAFFS_BLOCK_STATE_DEAD; + T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk)); + } + + // Read each chunk in the block. + + for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK && + state == YAFFS_BLOCK_STATE_SCANNING; c++) + { + // Read the spare area and decide what to do + chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c; + + yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1); + + + // This block looks ok, now what's in this chunk? + yaffs_GetTagsFromSpare(dev,&spare,&tags); + + if(yaffs_CountBits(spare.pageStatus) < 6) + { + // A deleted chunk + deleted++; + dev->nFreeChunks ++; + //T((" %d %d deleted\n",blk,c)); + } + else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID) + { + // An unassigned chunk in the block + // This means that either the block is empty or + // this is the one being allocated from + + if(c == 0) + { + // the block is unused + state = YAFFS_BLOCK_STATE_EMPTY; + dev->nErasedBlocks++; + } + else + { + // this is the block being allocated from + T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c)); + state = YAFFS_BLOCK_STATE_ALLOCATING; + dev->allocationBlock = blk; + dev->allocationPage = c; + } + + dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c); + } + else if(tags.chunkId > 0) + { + int endpos; + // A data chunk. + bi->pageBits |= (1 << c); + bi->pagesInUse++; + + in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE); + // PutChunkIntoFIle checks for a clash (two data chunks with + // the same chunkId). + yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1); + endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount; + if(in->variant.fileVariant.scannedFileSize variant.fileVariant.scannedFileSize = endpos; +#ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE + in->variant.fileVariant.fileSize = + in->variant.fileVariant.scannedFileSize; +#endif + + } + //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); + } + else + { + // chunkId == 0, so it is an ObjectHeader. + // Thus, we read in the object header and make the object + bi->pageBits |= (1 << c); + bi->pagesInUse++; + + yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1); + + oh = (yaffs_ObjectHeader *)chunkData; + + in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type); + + if(in->valid) + { + // We have already filled this one. We have a duplicate and need to resolve it. + + unsigned existingSerial = in->serial; + unsigned newSerial = tags.serialNumber; + + if(((existingSerial+1) & 3) == newSerial) + { + // Use new one - destroy the exisiting one + yaffs_DeleteChunk(dev,in->chunkId); + in->valid = 0; + } + else + { + // Use existing - destroy this one. + yaffs_DeleteChunk(dev,chunk); + } + } + + if(!in->valid && + (tags.objectId == YAFFS_OBJECTID_ROOT || + tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) + { + // We only load some info, don't fiddle with directory structure + in->valid = 1; + in->variantType = oh->type; + + in->st_mode = oh->st_mode; +#ifdef CONFIG_YAFFS_WINCE + in->win_atime[0] = oh->win_atime[0]; + in->win_ctime[0] = oh->win_ctime[0]; + in->win_mtime[0] = oh->win_mtime[0]; + in->win_atime[1] = oh->win_atime[1]; + in->win_ctime[1] = oh->win_ctime[1]; + in->win_mtime[1] = oh->win_mtime[1]; +#else + in->st_uid = oh->st_uid; + in->st_gid = oh->st_gid; + in->st_atime = oh->st_atime; + in->st_mtime = oh->st_mtime; + in->st_ctime = oh->st_ctime; + in->st_rdev = oh->st_rdev; +#endif + in->chunkId = chunk; + + } + else if(!in->valid) + { + // we need to load this info + + in->valid = 1; + in->variantType = oh->type; + + in->st_mode = oh->st_mode; +#ifdef CONFIG_YAFFS_WINCE + in->win_atime[0] = oh->win_atime[0]; + in->win_ctime[0] = oh->win_ctime[0]; + in->win_mtime[0] = oh->win_mtime[0]; + in->win_atime[1] = oh->win_atime[1]; + in->win_ctime[1] = oh->win_ctime[1]; + in->win_mtime[1] = oh->win_mtime[1]; +#else + in->st_uid = oh->st_uid; + in->st_gid = oh->st_gid; + in->st_atime = oh->st_atime; + in->st_mtime = oh->st_mtime; + in->st_ctime = oh->st_ctime; + in->st_rdev = oh->st_rdev; +#endif + in->chunkId = chunk; + + yaffs_SetObjectName(in,oh->name); + in->dirty = 0; + + // directory stuff... + // hook up to parent + + parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY); + if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN) + { + // Set up as a directory + parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY; + INIT_LIST_HEAD(&parent->variant.directoryVariant.children); + } + else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) + { + // Hoosterman, another problem.... + // We're trying to use a non-directory as a directory + // Todo ... handle + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: attempting to use non-directory as a directory in scan" TENDSTR))); + + } + + yaffs_AddObjectToDirectory(parent,in); + if(parent == dev->unlinkedDir) + { + in->deleted = 1; // If it is unlinked at start up then it wants deleting + dev->nDeletedFiles++; + } + + // Note re hardlinks. + // Since we might scan a hardlink before its equivalent object is scanned + // we put them all in a list. + // After scanning is complete, we should have all the objects, so we run through this + // list and fix up all the chains. + + switch(in->variantType) + { + case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem + break; + case YAFFS_OBJECT_TYPE_FILE: +#ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE + in->variant.fileVariant.fileSize = oh->fileSize; +#endif + break; + case YAFFS_OBJECT_TYPE_HARDLINK: + in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId; + (yaffs_Object *)(in->hardLinks.next) = hardList; + hardList = in; + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing + break; + case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing + break; + case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing + in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias); + break; + } + //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType)); + } + } + } + + if(state == YAFFS_BLOCK_STATE_SCANNING) + { + // If we got this far while scanning, then the block is fully allocated. + state = YAFFS_BLOCK_STATE_FULL; + } + + bi->blockState = state; + + // Now let's see if it was dirty + if( bi->pagesInUse == 0 && + bi->blockState == YAFFS_BLOCK_STATE_FULL) + { + yaffs_BlockBecameDirty(dev,blk); + } + + } + + // Fix up the hard link chains. + // We should now have scanned all the objects, now it's time to add these + // hardlinks. + while(hardList) + { + hl = hardList; + hardList = (yaffs_Object *)(hardList->hardLinks.next); + + in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId); + + if(in) + { + // Add the hardlink pointers + hl->variant.hardLinkVariant.equivalentObject=in; + list_add(&hl->hardLinks,&in->hardLinks); + } + else + { + //Todo Need to report/handle this better. + // Got a problem... hardlink to a non-existant object + hl->variant.hardLinkVariant.equivalentObject=NULL; + INIT_LIST_HEAD(&hl->hardLinks); + + } + + } + + + + return YAFFS_OK; +} + + +////////////////////////// Directory Functions ///////////////////////// + + +static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj) +{ + + if(obj->siblings.prev == NULL) + { + // Not initialised + INIT_LIST_HEAD(&obj->siblings); + + } + else if(!list_empty(&obj->siblings)) + { + // If it is holed up somewhere else, un hook it + list_del_init(&obj->siblings); + } + // Now add it + list_add(&obj->siblings,&directory->variant.directoryVariant.children); + obj->parent = directory; + + if(directory == obj->myDev->unlinkedDir) + { + obj->unlinked = 1; + obj->myDev->nUnlinkedFiles++; + obj->renameAllowed = 0; + } +} + +static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj) +{ + list_del_init(&obj->siblings); + obj->parent = NULL; +} + +yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name) +{ + int sum; + + struct list_head *i; + char buffer[YAFFS_MAX_NAME_LENGTH+1]; + + yaffs_Object *l; + + sum = yaffs_CalcNameSum(name); + + list_for_each(i,&directory->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + + // Special case for lost-n-found + if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND) + { + if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0) + { + return l; + } + } + else if(yaffs_SumCompare(l->sum, sum)) + { + // Do a real check + yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH); + if(yaffs_strcmp(name,buffer) == 0) + { + return l; + } + + + } + } + + return NULL; +} + + +int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)) +{ + struct list_head *i; + yaffs_Object *l; + + + list_for_each(i,&theDir->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + if(!fn(l)) + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; + +} + + +// GetEquivalentObject dereferences any hard links to get to the +// actual object. + +yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj) +{ + if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) + { + // We want the object id of the equivalent object, not this one + obj = obj->variant.hardLinkVariant.equivalentObject; + } + return obj; + +} + +int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize) +{ + memset(name,0,buffSize); + + if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) + { + strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1); + } + else if(obj->chunkId <= 0) + { + char locName[20]; + // make up a name + sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId); + strncpy(name,locName,buffSize - 1); + + } +#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM + else if(obj->shortName[0]) + { + strcpy(name,obj->shortName); + } +#endif + else + { + __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; + + memset(buffer,0,YAFFS_BYTES_PER_CHUNK); + + if(obj->chunkId >= 0) + { + yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1); + } + strncpy(name,oh->name,buffSize - 1); + } + + return strlen(name); +} + +int yaffs_GetObjectFileLength(yaffs_Object *obj) +{ + + // Dereference any hard linking + obj = yaffs_GetEquivalentObject(obj); + + if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) + { + return obj->variant.fileVariant.fileSize; + } + if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) + { + return strlen(obj->variant.symLinkVariant.alias); + } + else + { + // Only a directory should drop through to here + return YAFFS_BYTES_PER_CHUNK; + } +} + +int yaffs_GetObjectLinkCount(yaffs_Object *obj) +{ + int count = 0; + struct list_head *i; + + if(!obj->unlinked) + { + count++; // the object itself + } + list_for_each(i,&obj->hardLinks) + { + count++; // add the hard links; + } + return count; + +} + + +int yaffs_GetObjectInode(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + return obj->objectId; +} + +unsigned yaffs_GetObjectType(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break; + case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break; + case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break; + case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break; + case YAFFS_OBJECT_TYPE_SPECIAL: + if(S_ISFIFO(obj->st_mode)) return DT_FIFO; + if(S_ISCHR(obj->st_mode)) return DT_CHR; + if(S_ISBLK(obj->st_mode)) return DT_BLK; + if(S_ISSOCK(obj->st_mode)) return DT_SOCK; + default: return DT_REG; break; + } +} + +char *yaffs_GetSymlinkAlias(yaffs_Object *obj) +{ + obj = yaffs_GetEquivalentObject(obj); + if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) + { + return yaffs_CloneString(obj->variant.symLinkVariant.alias); + } + else + { + return yaffs_CloneString(""); + } +} + +#ifndef CONFIG_YAFFS_WINCE + +int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr) +{ + unsigned int valid = attr->ia_valid; + + if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode; + if(valid & ATTR_UID) obj->st_uid = attr->ia_uid; + if(valid & ATTR_GID) obj->st_gid = attr->ia_gid; + + if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime; + if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime; + if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime; + + if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size); + + yaffs_UpdateObjectHeader(obj,NULL,1); + + return YAFFS_OK; + +} +int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr) +{ + unsigned int valid = 0; + + attr->ia_mode = obj->st_mode; valid |= ATTR_MODE; + attr->ia_uid = obj->st_uid; valid |= ATTR_UID; + attr->ia_gid = obj->st_gid; valid |= ATTR_GID; + + attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME; + attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME; + attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME; + + attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE; + + attr->ia_valid = valid; + + return YAFFS_OK; + +} + +#endif + +int yaffs_DumpObject(yaffs_Object *obj) +{ +// __u8 buffer[YAFFS_BYTES_PER_CHUNK]; + char name[257]; +// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer; + +// memset(buffer,0,YAFFS_BYTES_PER_CHUNK); + +// if(obj->chunkId >= 0) +// { +// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL); +// } + + yaffs_GetObjectName(obj,name,256); + + T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR), + obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, + obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj))); + +#if 0 + YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n", + obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial, + obj->sum, obj->chunkId)); + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: + YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize)); + break; + case YAFFS_OBJECT_TYPE_DIRECTORY: + YPRINTF((" DIRECTORY\n")); + break; + case YAFFS_OBJECT_TYPE_HARDLINK: //todo + case YAFFS_OBJECT_TYPE_SYMLINK: + case YAFFS_OBJECT_TYPE_UNKNOWN: + default: + } +#endif + + return YAFFS_OK; +} + + +///////////////////////// Initialisation code /////////////////////////// + + + +int yaffs_GutsInitialise(yaffs_Device *dev) +{ + unsigned x; + int bits; + int extraBits; + int nBlocks; + + + + if(!yaffs_CheckStructures()) + { + T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR))); + return YAFFS_FAIL; + } + + if(dev->startBlock <= 0 || + (dev->endBlock - dev->startBlock) < 10) + { + T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR), + dev->startBlock, dev->endBlock)); + return YAFFS_FAIL; + } + + nBlocks = dev->endBlock - dev->startBlock + 1; + + + + // OK now calculate a few things for the device + // Calculate chunkGroupBits. + // We need to find the next power of 2 > than endBlock + + x = YAFFS_CHUNKS_PER_BLOCK * (dev->endBlock+1); + + for(bits = extraBits = 0; x > 1; bits++) + { + if(x & 1) extraBits++; + x >>= 1; + } + + if(extraBits > 0) bits++; + + + // Level0 Tnodes are 16 bits, so if the bitwidth of the + // chunk range we're using is greater than 16 we need + // to figure out chunk shift and chunkGroupSize + if(bits <= 16) + { + dev->chunkGroupBits = 0; + } + else + { + dev->chunkGroupBits = bits - 16; + } + dev->chunkGroupSize = 1 << dev->chunkGroupBits; + + + // More device initialisation + dev->garbageCollectionRequired = 0; + dev->garbageCollections = 0; + dev->currentDirtyChecker = 0; + dev->bufferedBlock = -1; + dev->doingBufferedBlockRewrite = 0; + dev->blockSelectedForGC = -1; + dev->nDeletedFiles = 0; + dev->nBackgroundDeletions=0; + dev->nUnlinkedFiles = 0; + dev->eccFixed=0; + dev->eccUnfixed=0; + dev->tagsEccFixed=0; + dev->tagsEccUnfixed=0; + + dev->localBuffer = YMALLOC(YAFFS_BYTES_PER_CHUNK); + + yaffs_InitialiseBlocks(dev,nBlocks); + + yaffs_InitialiseTnodes(dev); + + yaffs_InitialiseObjects(dev); + +#ifdef CONFIG_YAFFS_SHORT_OP_CACHE + { + int i; + for(i=0; i < YAFFS_N_CACHE_CHUNKS; i++) + { + dev->srCache[i].object = NULL; + dev->srCache[i].lastUse = 0; + dev->srCache[i].dirty = 0; + } + dev->srLastUse = 0; + } +#endif + + dev->cacheHits = 0; + + + // Initialise the unlinked, root and lost and found directories + dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL; + + dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR); + + dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR); + dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR); + yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir); + + + // Now scan the flash. + yaffs_Scan(dev); + + // Zero out stats + dev->nPageReads = 0; + dev->nPageWrites = 0; + dev->nBlockErasures = 0; + dev->nGCCopies = 0; + dev->nRetriedWrites = 0; + dev->nRetiredBlocks = 0; + + + return YAFFS_OK; + +} + +void yaffs_Deinitialise(yaffs_Device *dev) +{ + yaffs_DeinitialiseBlocks(dev); + yaffs_DeinitialiseTnodes(dev); + yaffs_DeinitialiseObjects(dev); + +} + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) +{ + int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS); + + struct list_head *i; + yaffs_Object *l; + + + // To the free chunks add the chunks that are in the deleted unlinked files. + list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) + { + l = list_entry(i, yaffs_Object,siblings); + if(l->deleted) + { + nFree++; + nFree += l->nDataChunks; + } + } + + + return (nFree < 0) ? 0 : nFree; + +} + + +/////////////////// YAFFS test code ////////////////////////////////// + +#define yaffs_CheckStruct(structure,syze, name) \ + if(sizeof(structure) != syze) \ + { \ + T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \ + return YAFFS_FAIL; \ + } + + +static int yaffs_CheckStructures(void) +{ + yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") + yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") + yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") + yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode") + yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader") + + + return YAFFS_OK; +} + +#if 0 +void yaffs_GutsTest(yaffs_Device *dev) +{ + + if(yaffs_CheckStructures() != YAFFS_OK) + { + T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR))); + return; + } + + yaffs_TnodeTest(dev); + yaffs_ObjectTest(dev); +} +#endif + + + diff --git a/yaffs_guts.h b/yaffs_guts.h index 08cc362..6130c4f 100644 --- a/yaffs_guts.h +++ b/yaffs_guts.h @@ -1,330 +1,330 @@ -/* - * YAFFS: Yet another FFS. A NAND-flash specific file system. - * yaffs_guts.h: Configuration etc for yaffs_guts - * - * Copyright (C) 2002 Aleph One Ltd. - * for Toby Churchill Ltd and Brightstar Engineering - * - * Created by Charles Manning - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License version 2.1 as - * published by the Free Software Foundation. - * - * - * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. - * - * $Id: yaffs_guts.h,v 1.11 2002-11-08 07:19:42 charles Exp $ - */ - -#ifndef __YAFFS_GUTS_H__ -#define __YAFFS_GUTS_H__ - -#include "devextras.h" - - -#define YAFFS_OK 1 -#define YAFFS_FAIL 0 - -// Give us a Y=0x59, -// Give us an A=0x41, -// Give us an FF=0xFF -// Give us an S=0x53 -// And what have we got... -#define YAFFS_MAGIC 0x5941FF53 - -#define YAFFS_NTNODES_LEVEL0 16 -#define YAFFS_TNODES_LEVEL0_BITS 4 -#define YAFFS_TNODES_LEVEL0_MASK 0xf - -#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) -#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) -#define YAFFS_TNODES_INTERNAL_MASK 0x7 -#define YAFFS_TNODES_MAX_LEVEL 6 - -#define YAFFS_BYTES_PER_CHUNK 512 -#define YAFFS_CHUNK_SIZE_SHIFT 9 - -#define YAFFS_BYTES_PER_SPARE 16 - -#define YAFFS_CHUNKS_PER_BLOCK 32 -#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) - -#define YAFFS_MAX_CHUNK_ID 0x000FFFFF - -#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF - -#define YAFFS_ALLOCATION_NOBJECTS 100 -#define YAFFS_ALLOCATION_NTNODES 100 -#define YAFFS_ALLOCATION_NLINKS 100 - -#define YAFFS_NOBJECT_BUCKETS 256 - - -#define YAFFS_RESERVED_BLOCKS 8 - -#define YAFFS_OBJECT_SPACE 0x40000 +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yaffs_guts.h: Configuration etc for yaffs_guts + * + * Copyright (C) 2002 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + * + * $Id: yaffs_guts.h,v 1.12 2002-11-26 01:15:37 charles Exp $ + */ + +#ifndef __YAFFS_GUTS_H__ +#define __YAFFS_GUTS_H__ + +#include "devextras.h" + + +#define YAFFS_OK 1 +#define YAFFS_FAIL 0 + +// Give us a Y=0x59, +// Give us an A=0x41, +// Give us an FF=0xFF +// Give us an S=0x53 +// And what have we got... +#define YAFFS_MAGIC 0x5941FF53 + +#define YAFFS_NTNODES_LEVEL0 16 +#define YAFFS_TNODES_LEVEL0_BITS 4 +#define YAFFS_TNODES_LEVEL0_MASK 0xf + +#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) +#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) +#define YAFFS_TNODES_INTERNAL_MASK 0x7 +#define YAFFS_TNODES_MAX_LEVEL 6 + +#define YAFFS_BYTES_PER_CHUNK 512 +#define YAFFS_CHUNK_SIZE_SHIFT 9 + +#define YAFFS_BYTES_PER_SPARE 16 + +#define YAFFS_CHUNKS_PER_BLOCK 32 +#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) + +#define YAFFS_MAX_CHUNK_ID 0x000FFFFF + +#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF + +#define YAFFS_ALLOCATION_NOBJECTS 100 +#define YAFFS_ALLOCATION_NTNODES 100 +#define YAFFS_ALLOCATION_NLINKS 100 + +#define YAFFS_NOBJECT_BUCKETS 256 + + +#define YAFFS_RESERVED_BLOCKS 8 + +#define YAFFS_OBJECT_SPACE 0x40000 #define YAFFS_MAX_NAME_LENGTH 255 -#define YAFFS_SHORT_NAME_LENGTH 15 - -#define YAFFS_MAX_ALIAS_LENGTH 159 - -#define YAFFS_OBJECTID_ROOT 1 -#define YAFFS_OBJECTID_LOSTNFOUND 2 -#define YAFFS_OBJECTID_UNLINKED 3 - -#define YAFFS_N_CACHE_CHUNKS 10 - -#ifdef CONFIG_YAFFS_WINCE - -// Force the short operation cache on for WinCE - -#define CONFIG_YAFFS_SHORT_OP_CACHE -#endif - - -// ChunkCache is used for short read/write operations. -typedef struct -{ - struct yaffs_ObjectStruct *object; - int chunkId; - int lastUse; - int dirty; - __u8 data[YAFFS_BYTES_PER_CHUNK]; -} yaffs_ChunkCache; - -// Tags structures in RAM -// NB This uses bitfield. Bitfields should not stradle a u32 boundary otherwise -// the structure size will get blown out. - -typedef struct -{ - unsigned chunkId:20; - unsigned serialNumber:2; - unsigned byteCount:10; - unsigned objectId:18; - unsigned ecc:12; - unsigned unusedStuff:2; -} yaffs_Tags; - -typedef union -{ - yaffs_Tags asTags; - __u8 asBytes[8]; -} yaffs_TagsUnion; - - -// Spare structure -typedef struct -{ - __u8 tagByte0; - __u8 tagByte1; - __u8 tagByte2; - __u8 tagByte3; - __u8 pageStatus; // set to 0 to delete the chunk - __u8 blockStatus; - __u8 tagByte4; - __u8 tagByte5; - __u8 ecc1[3]; - __u8 tagByte6; - __u8 tagByte7; - __u8 ecc2[3]; -} yaffs_Spare; - -// Block data in RAM - -typedef enum { - YAFFS_BLOCK_STATE_UddNKNOWN = 0, - YAFFS_BLOCK_STATE_SCANNING, // Used while the block is being scanned. - // NB Don't erase blocks while they're being scanned - - YAFFS_BLOCK_STATE_EMPTY, // This block is empty - - YAFFS_BLOCK_STATE_ALLOCATING, // This block is partially allocated. - // This is the one currently being used for page - // allocation. Should never be more than one of these - - - YAFFS_BLOCK_STATE_FULL, // All the pages in this block have been allocated. - // At least one page holds valid data. - - YAFFS_BLOCK_STATE_DIRTY, // All pages have been allocated and deleted. - // Erase me, reuse me. - - YAFFS_BLOCK_STATE_DEAD = 0x77 // This block has failed and is not in use - -} yaffs_BlockState; - - - - -typedef struct -{ - __u32 pageBits; // bitmap of pages in use - __u8 blockState; // One of the above block states - __u8 pagesInUse; // number of pages in use - __u8 needsRetiring:1; // Data has failed on this block, need to get valid data off - // and retire the block. -} yaffs_BlockInfo; - - -//////////////////// Object structure /////////////////////////// -// This is the object structure as stored on NAND - -typedef enum -{ - YAFFS_OBJECT_TYPE_UNKNOWN, - YAFFS_OBJECT_TYPE_FILE, - YAFFS_OBJECT_TYPE_SYMLINK, - YAFFS_OBJECT_TYPE_DIRECTORY, - YAFFS_OBJECT_TYPE_HARDLINK, - YAFFS_OBJECT_TYPE_SPECIAL -} yaffs_ObjectType; - -typedef struct -{ - yaffs_ObjectType type; - - // Apply to everything - int parentObjectId; - __u16 sum__NoLongerUsed; // checksum of name. Calc this off the name to prevent inconsistencies - char name[YAFFS_MAX_NAME_LENGTH + 1]; - - // Thes following apply to directories, files, symlinks - not hard links - __u32 st_mode; // protection +#define YAFFS_SHORT_NAME_LENGTH 15 + +#define YAFFS_MAX_ALIAS_LENGTH 159 + +#define YAFFS_OBJECTID_ROOT 1 +#define YAFFS_OBJECTID_LOSTNFOUND 2 +#define YAFFS_OBJECTID_UNLINKED 3 + +#define YAFFS_N_CACHE_CHUNKS 10 + +#ifdef CONFIG_YAFFS_WINCE + +// Force the short operation cache on for WinCE + +#define CONFIG_YAFFS_SHORT_OP_CACHE +#endif + + +// ChunkCache is used for short read/write operations. +typedef struct +{ + struct yaffs_ObjectStruct *object; + int chunkId; + int lastUse; + int dirty; + __u8 data[YAFFS_BYTES_PER_CHUNK]; +} yaffs_ChunkCache; + +// Tags structures in RAM +// NB This uses bitfield. Bitfields should not stradle a u32 boundary otherwise +// the structure size will get blown out. + +typedef struct +{ + unsigned chunkId:20; + unsigned serialNumber:2; + unsigned byteCount:10; + unsigned objectId:18; + unsigned ecc:12; + unsigned unusedStuff:2; +} yaffs_Tags; + +typedef union +{ + yaffs_Tags asTags; + __u8 asBytes[8]; +} yaffs_TagsUnion; + + +// Spare structure +typedef struct +{ + __u8 tagByte0; + __u8 tagByte1; + __u8 tagByte2; + __u8 tagByte3; + __u8 pageStatus; // set to 0 to delete the chunk + __u8 blockStatus; + __u8 tagByte4; + __u8 tagByte5; + __u8 ecc1[3]; + __u8 tagByte6; + __u8 tagByte7; + __u8 ecc2[3]; +} yaffs_Spare; + +// Block data in RAM + +typedef enum { + YAFFS_BLOCK_STATE_UddNKNOWN = 0, + YAFFS_BLOCK_STATE_SCANNING, // Used while the block is being scanned. + // NB Don't erase blocks while they're being scanned + + YAFFS_BLOCK_STATE_EMPTY, // This block is empty + + YAFFS_BLOCK_STATE_ALLOCATING, // This block is partially allocated. + // This is the one currently being used for page + // allocation. Should never be more than one of these + + + YAFFS_BLOCK_STATE_FULL, // All the pages in this block have been allocated. + // At least one page holds valid data. + + YAFFS_BLOCK_STATE_DIRTY, // All pages have been allocated and deleted. + // Erase me, reuse me. + + YAFFS_BLOCK_STATE_DEAD = 0x77 // This block has failed and is not in use + +} yaffs_BlockState; + + + + +typedef struct +{ + __u32 pageBits; // bitmap of pages in use + __u8 blockState; // One of the above block states + __u8 pagesInUse; // number of pages in use + __u8 needsRetiring:1; // Data has failed on this block, need to get valid data off + // and retire the block. +} yaffs_BlockInfo; + + +//////////////////// Object structure /////////////////////////// +// This is the object structure as stored on NAND + +typedef enum +{ + YAFFS_OBJECT_TYPE_UNKNOWN, + YAFFS_OBJECT_TYPE_FILE, + YAFFS_OBJECT_TYPE_SYMLINK, + YAFFS_OBJECT_TYPE_DIRECTORY, + YAFFS_OBJECT_TYPE_HARDLINK, + YAFFS_OBJECT_TYPE_SPECIAL +} yaffs_ObjectType; + +typedef struct +{ + yaffs_ObjectType type; + + // Apply to everything + int parentObjectId; + __u16 sum__NoLongerUsed; // checksum of name. Calc this off the name to prevent inconsistencies + char name[YAFFS_MAX_NAME_LENGTH + 1]; + + // Thes following apply to directories, files, symlinks - not hard links + __u32 st_mode; // protection #ifdef CONFIG_YAFFS_WINCE __u32 notForWinCE[5]; -#else - __u32 st_uid; // user ID of owner - __u32 st_gid; // group ID of owner - __u32 st_atime; // time of last access - __u32 st_mtime; // time of last modification - __u32 st_ctime; // time of last change +#else + __u32 st_uid; // user ID of owner + __u32 st_gid; // group ID of owner + __u32 st_atime; // time of last access + __u32 st_mtime; // time of last modification + __u32 st_ctime; // time of last change +#endif + + // File size applies to files only + int fileSize; + + // Equivalent object id applies to hard links only. + int equivalentObjectId; + + // Alias is for symlinks only. + char alias[YAFFS_MAX_ALIAS_LENGTH + 1]; + + __u32 st_rdev; // device stuff for block and char devices (maj/min) + +#ifdef CONFIG_YAFFS_WINCE + __u32 win_ctime[2]; + __u32 win_atime[2]; + __u32 win_mtime[2]; + __u32 roomToGrow[6]; +#else + __u32 roomToGrow[12]; #endif + +} yaffs_ObjectHeader; + + + +//////////////////// Tnode /////////////////////////// + +union yaffs_Tnode_union +{ + union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL]; + __u16 level0[YAFFS_NTNODES_LEVEL0]; + +}; + +typedef union yaffs_Tnode_union yaffs_Tnode; + +struct yaffs_TnodeList_struct +{ + struct yaffs_TnodeList_struct *next; + yaffs_Tnode *tnodes; +}; + +typedef struct yaffs_TnodeList_struct yaffs_TnodeList; + + + +/////////////////// Object //////////////////////////////// +// An object can be one of: +// - a directory (no data, has children links +// - a regular file (data.... not prunes :->). +// - a symlink [symbolic link] (the alias). +// - a hard link + + +typedef struct +{ + __u32 fileSize; + __u32 scannedFileSize; + int topLevel; + yaffs_Tnode *top; +} yaffs_FileStructure; + +typedef struct +{ + struct list_head children; // list of child links +} yaffs_DirectoryStructure; + +typedef struct +{ + char *alias; +} yaffs_SymLinkStructure; - // File size applies to files only - int fileSize; - - // Equivalent object id applies to hard links only. - int equivalentObjectId; - - // Alias is for symlinks only. - char alias[YAFFS_MAX_ALIAS_LENGTH + 1]; - - __u32 st_rdev; // device stuff for block and char devices (maj/min) - -#ifdef CONFIG_YAFFS_WINCE - __u32 win_ctime[2]; - __u32 win_atime[2]; - __u32 win_mtime[2]; - __u32 roomToGrow[6]; -#else - __u32 roomToGrow[12]; -#endif - -} yaffs_ObjectHeader; - - - -//////////////////// Tnode /////////////////////////// - -union yaffs_Tnode_union -{ - union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL]; - __u16 level0[YAFFS_NTNODES_LEVEL0]; - -}; - -typedef union yaffs_Tnode_union yaffs_Tnode; - -struct yaffs_TnodeList_struct -{ - struct yaffs_TnodeList_struct *next; - yaffs_Tnode *tnodes; -}; - -typedef struct yaffs_TnodeList_struct yaffs_TnodeList; - - - -/////////////////// Object //////////////////////////////// -// An object can be one of: -// - a directory (no data, has children links -// - a regular file (data.... not prunes :->). -// - a symlink [symbolic link] (the alias). -// - a hard link - - -typedef struct -{ - __u32 fileSize; - __u32 scannedFileSize; - int topLevel; - yaffs_Tnode *top; -} yaffs_FileStructure; - -typedef struct -{ - struct list_head children; // list of child links -} yaffs_DirectoryStructure; - -typedef struct -{ - char *alias; -} yaffs_SymLinkStructure; - -typedef struct -{ - struct yaffs_ObjectStruct *equivalentObject; - __u32 equivalentObjectId; -} yaffs_HardLinkStructure; - -typedef union -{ - yaffs_FileStructure fileVariant; - yaffs_DirectoryStructure directoryVariant; - yaffs_SymLinkStructure symLinkVariant; - yaffs_HardLinkStructure hardLinkVariant; -} yaffs_ObjectVariant; - - -struct yaffs_ObjectStruct -{ - __u8 deleted: 1; // This should only apply to unlinked files. - __u8 unlinked: 1; // An unlinked file. The file should be in the unlinked pseudo directory. - __u8 fake:1; // A fake object has no presence on NAND. - __u8 renameAllowed:1; - __u8 unlinkAllowed:1; - __u8 dirty:1; // the object needs to be written to flash - __u8 valid:1; // When the file system is being loaded up, this - // object might be created before the data - // is available (ie. file data records appear before the header). - __u8 serial; // serial number of chunk in NAND. Store here so we don't have to - // read back the old one to update. - __u16 sum; // sum of the name to speed searching - - struct yaffs_DeviceStruct *myDev; // The device I'm on - - - struct list_head hashLink; // list of objects in this hash bucket - - - struct list_head hardLinks; // all the equivalent hard linked objects - // live on this list - // directory structure stuff - struct yaffs_ObjectStruct *parent; //my parent directory - struct list_head siblings; // siblings in a directory - // also used for linking up the free list - - // Where's my data in NAND? - int chunkId; // where it lives - - int nDataChunks; - - __u32 objectId; // the object id value - - +typedef struct +{ + struct yaffs_ObjectStruct *equivalentObject; + __u32 equivalentObjectId; +} yaffs_HardLinkStructure; + +typedef union +{ + yaffs_FileStructure fileVariant; + yaffs_DirectoryStructure directoryVariant; + yaffs_SymLinkStructure symLinkVariant; + yaffs_HardLinkStructure hardLinkVariant; +} yaffs_ObjectVariant; + + +struct yaffs_ObjectStruct +{ + __u8 deleted: 1; // This should only apply to unlinked files. + __u8 unlinked: 1; // An unlinked file. The file should be in the unlinked pseudo directory. + __u8 fake:1; // A fake object has no presence on NAND. + __u8 renameAllowed:1; + __u8 unlinkAllowed:1; + __u8 dirty:1; // the object needs to be written to flash + __u8 valid:1; // When the file system is being loaded up, this + // object might be created before the data + // is available (ie. file data records appear before the header). + __u8 serial; // serial number of chunk in NAND. Store here so we don't have to + // read back the old one to update. + __u16 sum; // sum of the name to speed searching + + struct yaffs_DeviceStruct *myDev; // The device I'm on + + + struct list_head hashLink; // list of objects in this hash bucket + + + struct list_head hardLinks; // all the equivalent hard linked objects + // live on this list + // directory structure stuff + struct yaffs_ObjectStruct *parent; //my parent directory + struct list_head siblings; // siblings in a directory + // also used for linking up the free list + + // Where's my data in NAND? + int chunkId; // where it lives + + int nDataChunks; + + __u32 objectId; // the object id value + + __u32 st_mode; // protection #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM @@ -337,223 +337,225 @@ struct yaffs_ObjectStruct __u32 win_ctime[2]; __u32 win_mtime[2]; __u32 win_atime[2]; -#else - __u32 st_uid; // user ID of owner - __u32 st_gid; // group ID of owner - __u32 st_atime; // time of last access - __u32 st_mtime; // time of last modification - __u32 st_ctime; // time of last change - __u32 st_rdev; // device stuff for block and char devices +#else + __u32 st_uid; // user ID of owner + __u32 st_gid; // group ID of owner + __u32 st_atime; // time of last access + __u32 st_mtime; // time of last modification + __u32 st_ctime; // time of last change + __u32 st_rdev; // device stuff for block and char devices +#endif + + + + +#ifdef __KERNEL__ + struct inode *myInode; +#endif + + + + yaffs_ObjectType variantType; + + yaffs_ObjectVariant variant; + +}; + + + +typedef struct yaffs_ObjectStruct yaffs_Object; + + +struct yaffs_ObjectList_struct +{ + yaffs_Object *objects; + struct yaffs_ObjectList_struct *next; +}; + +typedef struct yaffs_ObjectList_struct yaffs_ObjectList; + +typedef struct +{ + struct list_head list; + int count; +} yaffs_ObjectBucket; + + +//////////////////// Device //////////////////////////////// + +struct yaffs_DeviceStruct +{ + // Entry parameters set up way early. Yaffs sets up the rest. + int startBlock; // Start block we're allowed to use + int endBlock; // End block we're allowed to use + __u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16 + __u16 chunkGroupSize; // == 2^^chunkGroupBits + + + void *genericDevice; // Pointer to device context + // On an mtd this holds the mtd pointer. + +#ifdef __KERNEL__ + + struct semaphore sem;// Semaphore for waiting on erasure. + struct semaphore grossLock; // Gross locking semaphore + +#endif + + + // NAND access functions (Must be set before calling YAFFS) + + int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare); + int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare); + int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND); + int (*initialiseNAND)(struct yaffs_DeviceStruct *dev); + +#ifdef __KERNEL__ + void (*putSuperFunc)(struct super_block *sb); +#endif + + // Runtime parameters. + yaffs_BlockInfo *blockInfo; + int nErasedBlocks; + int allocationBlock; + __u32 allocationPage; + + // Runtime state + int nTnodesCreated; + yaffs_Tnode *freeTnodes; + int nFreeTnodes; + yaffs_TnodeList *allocatedTnodeList; + + + int nObjectsCreated; + yaffs_Object *freeObjects; + int nFreeObjects; + + yaffs_ObjectList *allocatedObjectList; + + yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; + + int nFreeChunks; + + int currentDirtyChecker; // Used to find current dirtiest block + + int garbageCollectionRequired; + + // Operations since mount + int nPageWrites; + int nPageReads; + int nBlockErasures; + int nGCCopies; + int garbageCollections; + int nRetriedWrites; + int nRetiredBlocks; + int eccFixed; + int eccUnfixed; + int tagsEccFixed; + int tagsEccUnfixed; + + yaffs_Object *rootDir; + yaffs_Object *lostNFoundDir; + + // Buffer areas for storing data to recover from write failures + __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK]; + yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK]; + int bufferedBlock; // Which block is buffered here? + int doingBufferedBlockRewrite; + + int blockSelectedForGC; + +#ifdef CONFIG_YAFFS_SHORT_OP_CACHE + yaffs_ChunkCache srCache[YAFFS_N_CACHE_CHUNKS]; + int srLastUse; #endif + int cacheHits; + + // Stuff for background deletion and unlinked files. + yaffs_Object *unlinkedDir; // Directory where unlinked and deleted files live. + yaffs_Object *unlinkedDeletion; // Current file being background deleted. + int nDeletedFiles; // Count of files awaiting deletion; + int nUnlinkedFiles; // Count of unlinked files. + int nBackgroundDeletions; // Count of background deletions. + + __u8 *localBuffer; + +}; + +typedef struct yaffs_DeviceStruct yaffs_Device; + + + +//////////// YAFFS Functions ////////////////// + +int yaffs_GutsInitialise(yaffs_Device *dev); +void yaffs_Deinitialise(yaffs_Device *dev); + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev); + + +// Rename +int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName); + +// generic Object functions +int yaffs_Unlink(yaffs_Object *dir, const char *name); +int yaffs_DeleteFile(yaffs_Object *obj); + +// Object access functions. +int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize); +int yaffs_GetObjectFileLength(yaffs_Object *obj); +int yaffs_GetObjectInode(yaffs_Object *obj); +unsigned yaffs_GetObjectType(yaffs_Object *obj); +int yaffs_GetObjectLinkCount(yaffs_Object *obj); + +// Change inode attributes +int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr); +int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr); + +// File operations +int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes); +int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes); +int yaffs_ResizeFile(yaffs_Object *obj, int newSize); +yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); +int yaffs_FlushFile(yaffs_Object *obj); - - -#ifdef __KERNEL__ - struct inode *myInode; -#endif - - - - yaffs_ObjectType variantType; - - yaffs_ObjectVariant variant; - -}; - - - -typedef struct yaffs_ObjectStruct yaffs_Object; - - -struct yaffs_ObjectList_struct -{ - yaffs_Object *objects; - struct yaffs_ObjectList_struct *next; -}; - -typedef struct yaffs_ObjectList_struct yaffs_ObjectList; - -typedef struct -{ - struct list_head list; - int count; -} yaffs_ObjectBucket; - - -//////////////////// Device //////////////////////////////// - -struct yaffs_DeviceStruct -{ - // Entry parameters set up way early. Yaffs sets up the rest. - int startBlock; // Start block we're allowed to use - int endBlock; // End block we're allowed to use - __u16 chunkGroupBits; // 0 for devices <= 32MB. else log2(nchunks) - 16 - __u16 chunkGroupSize; // == 2^^chunkGroupBits - - - void *genericDevice; // Pointer to device context - // On an mtd this holds the mtd pointer. - -#ifdef __KERNEL__ - - struct semaphore sem;// Semaphore for waiting on erasure. - struct semaphore grossLock; // Gross locking semaphore - -#endif - - - // NAND access functions (Must be set before calling YAFFS) - - int (*writeChunkToNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare); - int (*readChunkFromNAND)(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare); - int (*eraseBlockInNAND)(struct yaffs_DeviceStruct *dev,int blockInNAND); - int (*initialiseNAND)(struct yaffs_DeviceStruct *dev); - -#ifdef __KERNEL__ - void (*putSuperFunc)(struct super_block *sb); -#endif - - // Runtime parameters. - yaffs_BlockInfo *blockInfo; - int nErasedBlocks; - int allocationBlock; - __u32 allocationPage; - - // Runtime state - int nTnodesCreated; - yaffs_Tnode *freeTnodes; - int nFreeTnodes; - yaffs_TnodeList *allocatedTnodeList; - - - int nObjectsCreated; - yaffs_Object *freeObjects; - int nFreeObjects; - - yaffs_ObjectList *allocatedObjectList; - - yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS]; - - int nFreeChunks; - - int currentDirtyChecker; // Used to find current dirtiest block - - int garbageCollectionRequired; - - // Operations since mount - int nPageWrites; - int nPageReads; - int nBlockErasures; - int nGCCopies; - int garbageCollections; - int nRetriedWrites; - int nRetiredBlocks; - int eccFixed; - int eccUnfixed; - int tagsEccFixed; - int tagsEccUnfixed; - - yaffs_Object *rootDir; - yaffs_Object *lostNFoundDir; - - // Buffer areas for storing data to recover from write failures - __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK]; - yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK]; - int bufferedBlock; // Which block is buffered here? - int doingBufferedBlockRewrite; - - int blockSelectedForGC; - -#ifdef CONFIG_YAFFS_SHORT_OP_CACHE - yaffs_ChunkCache srCache[YAFFS_N_CACHE_CHUNKS]; - int srLastUse; -#endif - int cacheHits; - - // Stuff for background deletion and unlinked files. - yaffs_Object *unlinkedDir; // Directory where unlinked and deleted files live. - yaffs_Object *unlinkedDeletion; // Current file being background deleted. - int nDeletedFiles; // Count of files awaiting deletion; - int nUnlinkedFiles; // Count of unlinked files. - int nBackgroundDeletions; // Count of background deletions. - -}; - -typedef struct yaffs_DeviceStruct yaffs_Device; - - - -//////////// YAFFS Functions ////////////////// - -int yaffs_GutsInitialise(yaffs_Device *dev); -void yaffs_Deinitialise(yaffs_Device *dev); - -int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev); - - -// Rename -int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName); - -// generic Object functions -int yaffs_Unlink(yaffs_Object *dir, const char *name); -int yaffs_DeleteFile(yaffs_Object *obj); - -// Object access functions. -int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize); -int yaffs_GetObjectFileLength(yaffs_Object *obj); -int yaffs_GetObjectInode(yaffs_Object *obj); -unsigned yaffs_GetObjectType(yaffs_Object *obj); -int yaffs_GetObjectLinkCount(yaffs_Object *obj); - -// Change inode attributes -int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr); -int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr); - -// File operations -int yaffs_ReadDataFromFile(yaffs_Object *obj, __u8 *buffer, __u32 offset, int nBytes); -int yaffs_WriteDataToFile(yaffs_Object *obj, const __u8 *buffer, __u32 offset, int nBytes); -int yaffs_ResizeFile(yaffs_Object *obj, int newSize); - -yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); -int yaffs_FlushFile(yaffs_Object *obj); - - -// Directory operations -yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); -yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const char *name); -int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)); - -yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number); - -// Link operations -yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject); - -yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj); - -// Symlink operations -yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const char *name, __u32 mode, __u32 uid, __u32 gid, const char *alias); -char *yaffs_GetSymlinkAlias(yaffs_Object *obj); - -// Special inodes (fifos, sockets and devices) -yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev); - - -// Special directories -yaffs_Object *yaffs_Root(yaffs_Device *dev); + +// Directory operations +yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid); +yaffs_Object *yaffs_FindObjectByName(yaffs_Object *theDir,const char *name); +int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *)); + +yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number); + +// Link operations +yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject); + +yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj); + +// Symlink operations +yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const char *name, __u32 mode, __u32 uid, __u32 gid, const char *alias); +char *yaffs_GetSymlinkAlias(yaffs_Object *obj); + +// Special inodes (fifos, sockets and devices) +yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,__u32 rdev); + + +// Special directories +yaffs_Object *yaffs_Root(yaffs_Device *dev); yaffs_Object *yaffs_LostNFound(yaffs_Device *dev); #ifdef CONFIG_YAFFS_WINCE // CONFIG_YAFFS_WINCE special stuff void yfsd_WinFileTimeNow(__u32 target[2]); -#endif - - -// Debug dump -int yaffs_DumpObject(yaffs_Object *obj); - - -void yaffs_GutsTest(yaffs_Device *dev); - - -#endif +#endif + + +// Debug dump +int yaffs_DumpObject(yaffs_Object *obj); + + +void yaffs_GutsTest(yaffs_Device *dev); + + +#endif diff --git a/yaffs_mtdif.c b/yaffs_mtdif.c index 923de91..4d31736 100644 --- a/yaffs_mtdif.c +++ b/yaffs_mtdif.c @@ -13,7 +13,7 @@ * */ -const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.3 2002-09-27 20:50:50 charles Exp $"; +const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.4 2002-11-26 01:15:37 charles Exp $"; #ifdef CONFIG_YAFFS_MTD_ENABLED @@ -24,6 +24,10 @@ const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.3 2002-09-27 20:50:5 #include "linux/mtd/mtd.h" #include "linux/types.h" +#ifndef CONFIG_YAFFS_USE_OLD_MTD +#include "linux/mtd/nand.h" +#endif + int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare) { @@ -34,11 +38,26 @@ int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, __u8 *spareAsBytes = (__u8 *)spare; - + +#ifndef CONFIG_YAFFS_USE_OLD_MTD + if(data && spare) + { +#ifdef CONFIG_YAFFS_USE_NANDECC + mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB); +#else + mtd->write_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB); +#endif + } + else + { +#endif if(data) mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data); if(spare) mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes); +#ifndef CONFIG_YAFFS_USE_OLD_MTD + } +#endif return YAFFS_OK; } @@ -52,12 +71,27 @@ int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaf loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK; __u8 *spareAsBytes = (__u8 *)spare; + +#ifndef CONFIG_YAFFS_USE_OLD_MTD + if(data && spare) + { +#ifdef CONFIG_YAFFS_USE_NANDECC + mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_YAFFS_OOB); +#else + mtd->read_ecc(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data,spareAsBytes,NAND_NONE_OOB); +#endif + } + else + { +#endif if(data) mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data); if(spare) mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes); - +#ifndef CONFIG_YAFFS_USE_OLD_MTD + } +#endif return YAFFS_OK; } diff --git a/yaffs_ramem.c b/yaffs_ramem.c index 28ce406..1a82ae5 100644 --- a/yaffs_ramem.c +++ b/yaffs_ramem.c @@ -15,7 +15,7 @@ //yaffs_ramem.c // Since this creates the RAM block at start up it is pretty useless for testing the scanner. -const char *yaffs_ramem_c_version = "$Id: yaffs_ramem.c,v 1.5 2002-09-27 20:50:50 charles Exp $"; +const char *yaffs_ramem_c_version = "$Id: yaffs_ramem.c,v 1.6 2002-11-26 01:15:37 charles Exp $"; #ifndef __KERNEL__ #define CONFIG_YAFFS_RAM_ENABLED @@ -38,7 +38,7 @@ const char *yaffs_ramem_c_version = "$Id: yaffs_ramem.c,v 1.5 2002-09-27 20:50:5 #define FILE_SIZE_IN_BLOCKS (FILE_SIZE_IN_MEG * BLOCKS_PER_MEG) #define FILE_SIZE_IN_BYTES (FILE_SIZE_IN_BLOCKS * BLOCK_SIZE) -#define T(x) YPRINTF(x) + #define DEFAULT_SIZE_IN_MB 2 @@ -166,7 +166,7 @@ static int CheckInit(void) } YFREE(ned.block); - T(("Allocation failed, could only allocate %dMB of %dMB requested.\n", + T(YAFFS_TRACE_ALWAYS,("Allocation failed, could only allocate %dMB of %dMB requested.\n", nAllocated/64,sizeInMB)); return 0; } @@ -289,11 +289,11 @@ int nandemul_EraseBlockInNAND(yaffs_Device *dev, int blockNumber) if(blockNumber < 0 || blockNumber >= ned.nBlocks) { - T(("Attempt to erase non-existant block %d\n",blockNumber)); + T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber)); } else if(ned.block[blockNumber]->damaged) { - T(("Attempt to erase damaged block %d\n",blockNumber)); + T(YAFFS_TRACE_ALWAYS,("Attempt to erase damaged block %d\n",blockNumber)); } else { diff --git a/yaffsdev.proj b/yaffsdev.proj index a7982ec3aadaf9ae7f7c2efb96002a049bbed45d..770d67c5c763dffc2423e8bee0a725bda635b61e 100644 GIT binary patch delta 884 zcmah|Ur19?9NzXjju|sF$b6ZerQkMoUR@g&3!NKkVJcz|KI!G&v${CXjorI{jiK}q zVMN7wF@hSb!d?WqMnR7~MNbh#NPphKhYEt~QM)I-)++Gnclf^V_vf77cNWXAScV%X z9G@SoMK}9vmhIHOZ1@LMds8u=CP`c@W@IeSC{)u$sw<*S*hFjN;a^-8?90gP>xj?r z#FpH~wXtUnv2W-jiXs7ZBM)jqZgc=`!6$eRui*teho`U(6)3|JT!B1ffq(>OVFE^A z2<%NZ+qz@OxHU*+P3QoAm`EH;*41A(InDpGk~muF5<#hfms zXoOQ(zy&dx)MiXdNd~17E)rSM@&DDl&}oaBB%&NYpP_SBoBeA2lVFzfwWbt0x0jjJ zevhy-7pJ+-uNCI^k?tzE+8s|5a|2UUm5Ii-+db8Qsi+&y=-S>}u!cbMUr2wz@8%OH zL|x=JWM#jXbqCyRA=$=e1Bcj_&&lqtIC*t8ywb?qIwy&yTqIm-9e30&W05=tqm)_= z9?YaALd9&CfP2Dy0=v`MR(_+r{) z1KybSh=aprvwe5OVeREx$4ROR#hgNAHHSkzAsjh|!^Z_Pg!a%#1owq3l*hcuc7!6m z9U(SeX|Lb)0luJWI4lHv+2u-MaLR{sX+(ee1M vp%NskNCc-;NlXo5wp}T(C-=_PRec3^eY(^AC&IiBn~j$H@mk}iP+ z{AA?XKAv>B9q&1}RoAXLtlOO)H;!k@@QAr?Jv_f$+L3Y%xSqpPcmh)}3HRU*+=2vL zg^SPwryv3XRKa1`0{~yi7xIp5k~OkI-jF5YDCanVELjuRpE>cGS@UgN=a<0^;ObrO4CiIX86P?9bvL!?hzm2hy~U8D^g{#Hc{CVk~CJEW=AXJv&8vw`$*zsHp$7@&((VUitTk{vKv_ zCN*g=s>U>2OZYs6AQ+SF6>CbOs$wc)QZd*s*T{?iLi;H0!tT8FC&=%C^Z^^p--bG@O zdg9#6aU0Hhl3Uww){G3>Z_|cpsJWFk31J#;73lF$OFrJTV}s2bA{d_yl*H4f!Amry z88j4W;v+aco5d@0*&Z4e= - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License version 2.1 as - * published by the Free Software Foundation. - * - * - * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. - * - * $Id: yportenv.h,v 1.6 2002-11-08 07:19:42 charles Exp $ - * - */ - -#ifndef __YPORTENV_H__ -#define __YPORTENV_H__ - - -#if defined CONFIG_YAFFS_WINCE - -// CONFIG_YAFFS_WINCE -#include "stdlib.h" -#include "stdio.h" -#include "string.h" - -#define YMALLOC(x) malloc(x) -#define YFREE(x) free(x) - - -#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) -#define YALERT(s) YINFO(s) - -#include - -#define YAFFS_LOSTNFOUND_NAME "Lost Clusters" -#define YAFFS_LOSTNFOUND_PREFIX "OBJ" - -#define YPRINTF(x) - -// Always pass the sum compare to overcome the case insensitivity issue -#define yaffs_SumCompare(x,y) ((x) == (y)) -#define yaffs_strcmp(a,b) _stricmp(a,b) - - -#define u_char unsigned char -#define loff_t int -#define S_IFDIR 04000 - -#define S_ISFIFO(x) 0 -#define S_ISCHR(x) 0 -#define S_ISBLK(x) 0 -#define S_ISSOCK(x) 0 - -extern unsigned yfsd_U32FileTimeNow(void); - -#define CURRENT_TIME yfsd_U32FileTimeNow() -#define YAFFS_ROOT_MODE FILE_ATTRIBUTE_ARCHIVE -#define YAFFS_LOSTNFOUND_MODE FILE_ATTRIBUTE_HIDDEN - - -#define TENDSTR L"\r\n" -#define TSTR(x) TEXT(x) -#define TOUT(x) RETAILMSG(1, x) - - -#elif defined __KERNEL__ - - - -// Linux kernel -#include "linux/kernel.h" -#include "linux/mm.h" -#include "linux/string.h" -#include "linux/slab.h" - - -#define YAFFS_LOSTNFOUND_NAME "lost+found" -#define YAFFS_LOSTNFOUND_PREFIX "obj" - -//#define YPRINTF(x) printk x -#define YMALLOC(x) kmalloc(x,GFP_KERNEL) -#define YFREE(x) kfree(x) - -#define YAFFS_ROOT_MODE 0666 -#define YAFFS_LOSTNFOUND_MODE 0666 - - -#define yaffs_SumCompare(x,y) ((x) == (y)) -#define yaffs_strcmp(a,b) strcmp(a,b) - -#define TENDSTR "\n" -#define TSTR(x) KERN_DEBUG x -#define TOUT(p) printk p - - -#else - -// Linux application -#include "stdlib.h" -#include "stdio.h" -#include "string.h" - -#define YMALLOC(x) malloc(x) -#define YFREE(x) free(x) - - -//#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) -//#define YALERT(s) YINFO(s) - - -#define TENDSTR "\n" -#define TSTR(x) x -#define TOUT(p) printf p - - -#define YAFFS_LOSTNFOUND_NAME "lost+found" -#define YAFFS_LOSTNFOUND_PREFIX "obj" -//#define YPRINTF(x) printf x - -#define CURRENT_TIME 0 -#define YAFFS_ROOT_MODE 0666 -#define YAFFS_LOSTNFOUND_MODE 0666 - -#define yaffs_SumCompare(x,y) ((x) == (y)) -#define yaffs_strcmp(a,b) strcmp(a,b) - -#endif - - -extern unsigned yaffs_traceMask; - -#define YAFFS_TRACE_ERROR 0x0001 -#define YAFFS_TRACE_OS 0x0002 -#define YAFFS_TRACE_ALLOCATE 0x0004 -#define YAFFS_TRACE_SCAN 0x0008 -#define YAFFS_TRACE_BAD_BLOCKS 0x0010 -#define YAFFS_TRACE_ERASE 0x0020 -#define YAFFS_TRACE_TRACING 0x0100 -#define YAFFS_TRACE_ALWAYS 0x0200 -#define YAFFS_TRACE_BUG 0x8000 - -#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ERROR)) TOUT(p);} while(0) - -//#undef YINFO - - -//#define YINFO(s) YPRINTF((KERN_DEBUG __FILE__ " %d %s\n",__LINE__,s)) -//#define YALERT(s) YINFO(s) -#ifdef CONFIG_YAFFS_WINCE -#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: %s %d" TENDSTR),TEXT(__FILE__),__LINE__)) -#else -#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__)) -#endif -#endif +/* + * YAFFS: Yet another FFS. A NAND-flash specific file system. + * yportenv.h: Portable services used by yaffs. This is done to allow + * simple migration from kernel space into app space for testing. + * + * Copyright (C) 2002 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 2.1 as + * published by the Free Software Foundation. + * + * + * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. + * + * $Id: yportenv.h,v 1.7 2002-11-26 01:15:37 charles Exp $ + * + */ + +#ifndef __YPORTENV_H__ +#define __YPORTENV_H__ + + +#if defined CONFIG_YAFFS_WINCE + +// CONFIG_YAFFS_WINCE +#include "stdlib.h" +#include "stdio.h" +#include "string.h" + +#define YMALLOC(x) malloc(x) +#define YFREE(x) free(x) + + +#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) +#define YALERT(s) YINFO(s) + +#include + +#define YAFFS_LOSTNFOUND_NAME "Lost Clusters" +#define YAFFS_LOSTNFOUND_PREFIX "OBJ" + +#define YPRINTF(x) + +// Always pass the sum compare to overcome the case insensitivity issue +#define yaffs_SumCompare(x,y) ((x) == (y)) +#define yaffs_strcmp(a,b) _stricmp(a,b) + + +#define u_char unsigned char +#define loff_t int +#define S_IFDIR 04000 + +#define S_ISFIFO(x) 0 +#define S_ISCHR(x) 0 +#define S_ISBLK(x) 0 +#define S_ISSOCK(x) 0 + +extern unsigned yfsd_U32FileTimeNow(void); + +#define CURRENT_TIME yfsd_U32FileTimeNow() +#define YAFFS_ROOT_MODE FILE_ATTRIBUTE_ARCHIVE +#define YAFFS_LOSTNFOUND_MODE FILE_ATTRIBUTE_HIDDEN + + +#define TENDSTR L"\r\n" +#define TSTR(x) TEXT(x) +#define TOUT(x) RETAILMSG(1, x) + + +#elif defined __KERNEL__ + + + +// Linux kernel +#include "linux/kernel.h" +#include "linux/mm.h" +#include "linux/string.h" +#include "linux/slab.h" + + +#define YAFFS_LOSTNFOUND_NAME "lost+found" +#define YAFFS_LOSTNFOUND_PREFIX "obj" + +//#define YPRINTF(x) printk x +#define YMALLOC(x) kmalloc(x,GFP_KERNEL) +#define YFREE(x) kfree(x) + +#define YAFFS_ROOT_MODE 0666 +#define YAFFS_LOSTNFOUND_MODE 0666 + + +#define yaffs_SumCompare(x,y) ((x) == (y)) +#define yaffs_strcmp(a,b) strcmp(a,b) + +#define TENDSTR "\n" +#define TSTR(x) KERN_DEBUG x +#define TOUT(p) printk p + + +#else + +// Linux application +#include "stdlib.h" +#include "stdio.h" +#include "string.h" + +#define YMALLOC(x) malloc(x) +#define YFREE(x) free(x) + + +//#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) +//#define YALERT(s) YINFO(s) + + +#define TENDSTR "\n" +#define TSTR(x) x +#define TOUT(p) printf p + + +#define YAFFS_LOSTNFOUND_NAME "lost+found" +#define YAFFS_LOSTNFOUND_PREFIX "obj" +//#define YPRINTF(x) printf x + +#define CURRENT_TIME 0 +#define YAFFS_ROOT_MODE 0666 +#define YAFFS_LOSTNFOUND_MODE 0666 + +#define yaffs_SumCompare(x,y) ((x) == (y)) +#define yaffs_strcmp(a,b) strcmp(a,b) + +#endif + + +extern unsigned yaffs_traceMask; + +#define YAFFS_TRACE_ERROR 0x0001 +#define YAFFS_TRACE_OS 0x0002 +#define YAFFS_TRACE_ALLOCATE 0x0004 +#define YAFFS_TRACE_SCAN 0x0008 +#define YAFFS_TRACE_BAD_BLOCKS 0x0010 +#define YAFFS_TRACE_ERASE 0x0020 +#define YAFFS_TRACE_TRACING 0x0100 +#define YAFFS_TRACE_ALWAYS 0x0200 +#define YAFFS_TRACE_BUG 0x8000 + +#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ERROR)) TOUT(p);} while(0) + +//#undef YINFO + + +//#define YINFO(s) YPRINTF((KERN_DEBUG __FILE__ " %d %s\n",__LINE__,s)) +//#define YALERT(s) YINFO(s) +#ifdef CONFIG_YAFFS_WINCE +#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: %s %d" TENDSTR),TEXT(__FILE__),__LINE__)) +#else +#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__)) +#endif +#endif -- 2.30.2