2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
23 * This is the file system front-end to YAFFS that hooks it up to
27 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
35 * NB There are two variants of Linux VFS glue code. This variant supports
36 * a single version and should not include any multi-version code.
38 #include <linux/version.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
45 #include <linux/proc_fs.h>
46 #include <linux/smp_lock.h>
47 #include <linux/pagemap.h>
48 #include <linux/mtd/mtd.h>
49 #include <linux/interrupt.h>
50 #include <linux/string.h>
51 #include <linux/ctype.h>
52 #include <linux/namei.h>
53 #include <linux/exportfs.h>
54 #include <linux/kthread.h>
55 #include <linux/delay.h>
56 #include <linux/freezer.h>
58 #include <asm/div64.h>
61 #include <linux/statfs.h>
63 #define UnlockPage(p) unlock_page(p)
64 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
66 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
68 #define YPROC_ROOT NULL
70 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
72 #define WRITE_SIZE_STR "writesize"
73 #define WRITE_SIZE(mtd) ((mtd)->writesize)
76 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
78 uint64_t result = partition_size;
79 do_div(result, block_size);
80 return (uint32_t)result;
83 #include <linux/uaccess.h>
84 #include <linux/mtd/mtd.h>
87 #include "yaffs_trace.h"
88 #include "yaffs_guts.h"
90 #include "yaffs_linux.h"
92 #include "yaffs_mtdif.h"
93 #include "yaffs_mtdif1.h"
94 #include "yaffs_mtdif2.h"
96 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
97 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
98 unsigned int yaffs_auto_checkpoint = 1;
99 unsigned int yaffs_gc_control = 1;
100 unsigned int yaffs_bg_enable = 1;
102 /* Module Parameters */
103 module_param(yaffs_trace_mask, uint, 0644);
104 module_param(yaffs_wr_attempts, uint, 0644);
105 module_param(yaffs_auto_checkpoint, uint, 0644);
106 module_param(yaffs_gc_control, uint, 0644);
107 module_param(yaffs_bg_enable, uint, 0644);
109 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
111 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
113 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
114 #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
115 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
116 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
119 #define update_dir_time(dir) do {\
120 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
123 static void yaffs_put_super(struct super_block *sb);
125 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
127 static ssize_t yaffs_hold_space(struct file *f);
128 static void yaffs_release_space(struct file *f);
130 static int yaffs_file_flush(struct file *file, fl_owner_t id);
132 static int yaffs_sync_object(struct file *file, int datasync);
134 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
136 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
137 struct nameidata *n);
138 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
139 struct nameidata *n);
140 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
141 struct dentry *dentry);
142 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
143 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
144 const char *symname);
145 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
147 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
149 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
150 struct inode *new_dir, struct dentry *new_dentry);
151 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
153 static int yaffs_sync_fs(struct super_block *sb, int wait);
154 static void yaffs_write_super(struct super_block *sb);
156 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
158 #ifdef YAFFS_HAS_PUT_INODE
159 static void yaffs_put_inode(struct inode *inode);
162 static void yaffs_evict_inode(struct inode *);
164 static int yaffs_readpage(struct file *file, struct page *page);
165 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
167 #ifdef CONFIG_YAFFS_XATTR
168 int yaffs_setxattr(struct dentry *dentry, const char *name,
169 const void *value, size_t size, int flags);
170 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
172 int yaffs_removexattr(struct dentry *dentry, const char *name);
173 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
177 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
178 loff_t pos, unsigned len, unsigned flags,
179 struct page **pagep, void **fsdata);
180 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
181 loff_t pos, unsigned len, unsigned copied,
182 struct page *pg, void *fsdadata);
184 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
186 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
187 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
189 static void yaffs_touch_super(struct yaffs_dev *dev);
191 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
193 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
196 static struct address_space_operations yaffs_file_address_operations = {
197 .readpage = yaffs_readpage,
198 .writepage = yaffs_writepage,
199 .write_begin = yaffs_write_begin,
200 .write_end = yaffs_write_end,
204 static const struct file_operations yaffs_file_operations = {
205 .read = do_sync_read,
206 .write = do_sync_write,
207 .aio_read = generic_file_aio_read,
208 .aio_write = generic_file_aio_write,
209 .mmap = generic_file_mmap,
210 .flush = yaffs_file_flush,
211 .fsync = yaffs_sync_object,
212 .splice_read = generic_file_splice_read,
213 .splice_write = generic_file_splice_write,
214 .llseek = generic_file_llseek,
219 static const struct inode_operations yaffs_file_inode_operations = {
220 .setattr = yaffs_setattr,
221 #ifdef CONFIG_YAFFS_XATTR
222 .setxattr = yaffs_setxattr,
223 .getxattr = yaffs_getxattr,
224 .listxattr = yaffs_listxattr,
225 .removexattr = yaffs_removexattr,
229 static const struct inode_operations yaffs_symlink_inode_operations = {
230 .readlink = yaffs_readlink,
231 .follow_link = yaffs_follow_link,
232 .put_link = yaffs_put_link,
233 .setattr = yaffs_setattr,
234 #ifdef CONFIG_YAFFS_XATTR
235 .setxattr = yaffs_setxattr,
236 .getxattr = yaffs_getxattr,
237 .listxattr = yaffs_listxattr,
238 .removexattr = yaffs_removexattr,
242 static const struct inode_operations yaffs_dir_inode_operations = {
243 .create = yaffs_create,
244 .lookup = yaffs_lookup,
246 .unlink = yaffs_unlink,
247 .symlink = yaffs_symlink,
248 .mkdir = yaffs_mkdir,
249 .rmdir = yaffs_unlink,
250 .mknod = yaffs_mknod,
251 .rename = yaffs_rename,
252 .setattr = yaffs_setattr,
253 #ifdef CONFIG_YAFFS_XATTR
254 .setxattr = yaffs_setxattr,
255 .getxattr = yaffs_getxattr,
256 .listxattr = yaffs_listxattr,
257 .removexattr = yaffs_removexattr,
261 static const struct file_operations yaffs_dir_operations = {
262 .read = generic_read_dir,
263 .readdir = yaffs_readdir,
264 .fsync = yaffs_sync_object,
265 .llseek = yaffs_dir_llseek,
268 static const struct super_operations yaffs_super_ops = {
269 .statfs = yaffs_statfs,
270 #ifdef YAFFS_HAS_PUT_INODE
271 .put_inode = yaffs_put_inode,
273 .put_super = yaffs_put_super,
274 .evict_inode = yaffs_evict_inode,
275 .sync_fs = yaffs_sync_fs,
276 .write_super = yaffs_write_super,
280 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
282 setattr_copy(inode,attr);
286 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
288 truncate_setsize(inode,newsize);
292 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
294 return yaffs_gc_control;
297 static void yaffs_gross_lock(struct yaffs_dev *dev)
299 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
300 down(&(yaffs_dev_to_lc(dev)->gross_lock));
301 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
304 static void yaffs_gross_unlock(struct yaffs_dev *dev)
306 T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
307 up(&(yaffs_dev_to_lc(dev)->gross_lock));
312 /* ExportFS support */
313 static struct inode *
314 yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
316 return Y_IGET(sb, ino);
319 static struct dentry *
320 yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
322 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
325 static struct dentry *
326 yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
328 return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
331 struct dentry *yaffs2_get_parent(struct dentry *dentry)
334 struct super_block *sb = dentry->d_inode->i_sb;
335 struct dentry *parent = ERR_PTR(-ENOENT);
337 unsigned long parent_ino;
338 struct yaffs_obj *d_obj;
339 struct yaffs_obj *parent_obj;
341 d_obj = yaffs_inode_to_obj(dentry->d_inode);
344 parent_obj = d_obj->parent;
346 parent_ino = yaffs_get_obj_inode(parent_obj);
347 inode = Y_IGET(sb, parent_ino);
350 parent = ERR_CAST(inode);
352 parent = d_obtain_alias(inode);
353 if (!IS_ERR(parent)) {
354 parent = ERR_PTR(-ENOMEM);
364 /* Just declare a zero structure as a NULL value implies
365 * using the default functions of exportfs.
368 static struct export_operations yaffs_export_ops =
370 .fh_to_dentry = yaffs2_fh_to_dentry,
371 .fh_to_parent = yaffs2_fh_to_parent,
372 .get_parent = yaffs2_get_parent,
375 /*-----------------------------------------------------------------*/
376 /* Directory search context allows us to unlock access to yaffs during
377 * filldir without causing problems with the directory being modified.
378 * This is similar to the tried and tested mechanism used in yaffs direct.
380 * A search context iterates along a doubly linked list of siblings in the
381 * directory. If the iterating object is deleted then this would corrupt
382 * the list iteration, likely causing a crash. The search context avoids
383 * this by using the remove_obj_fn to move the search context to the
384 * next object before the object is deleted.
386 * Many readdirs (and thus seach conexts) may be alive simulateously so
387 * each struct yaffs_dev has a list of these.
389 * A seach context lives for the duration of a readdir.
391 * All these functions must be called while yaffs is locked.
394 struct yaffs_search_context {
395 struct yaffs_dev *dev;
396 struct yaffs_obj *dir_obj;
397 struct yaffs_obj *next_return;
398 struct list_head others;
402 * yaffs_new_search() creates a new search context, initialises it and
403 * adds it to the device's search context list.
405 * Called at start of readdir.
407 static struct yaffs_search_context * yaffs_new_search(struct yaffs_obj *dir)
409 struct yaffs_dev *dev = dir->my_dev;
410 struct yaffs_search_context *sc = YMALLOC(sizeof(struct yaffs_search_context));
414 if( list_empty(&sc->dir_obj->variant.dir_variant.children))
415 sc->next_return = NULL;
417 sc->next_return = list_entry(
418 dir->variant.dir_variant.children.next,
419 struct yaffs_obj,siblings);
420 INIT_LIST_HEAD(&sc->others);
421 list_add(&sc->others,&(yaffs_dev_to_lc(dev)->search_contexts));
427 * yaffs_search_end() disposes of a search context and cleans up.
429 static void yaffs_search_end(struct yaffs_search_context * sc)
432 list_del(&sc->others);
438 * yaffs_search_advance() moves a search context to the next object.
439 * Called when the search iterates or when an object removal causes
440 * the search context to be moved to the next object.
442 static void yaffs_search_advance(struct yaffs_search_context *sc)
447 if( sc->next_return == NULL ||
448 list_empty(&sc->dir_obj->variant.dir_variant.children))
449 sc->next_return = NULL;
451 struct list_head *next = sc->next_return->siblings.next;
453 if( next == &sc->dir_obj->variant.dir_variant.children)
454 sc->next_return = NULL; /* end of list */
456 sc->next_return = list_entry(next,struct yaffs_obj,siblings);
461 * yaffs_remove_obj_callback() is called when an object is unlinked.
462 * We check open search contexts and advance any which are currently
463 * on the object being iterated.
465 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
469 struct yaffs_search_context *sc;
470 struct list_head *search_contexts = &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
473 /* Iterate through the directory search contexts.
474 * If any are currently on the object being removed, then advance
475 * the search context to the next object to prevent a hanging pointer.
477 list_for_each(i, search_contexts) {
479 sc = list_entry(i, struct yaffs_search_context,others);
480 if(sc->next_return == obj)
481 yaffs_search_advance(sc);
488 /*-----------------------------------------------------------------*/
490 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
493 unsigned char *alias;
496 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
498 yaffs_gross_lock(dev);
500 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
502 yaffs_gross_unlock(dev);
507 ret = vfs_readlink(dentry, buffer, buflen, alias);
512 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
514 unsigned char *alias;
516 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
518 yaffs_gross_lock(dev);
520 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
521 yaffs_gross_unlock(dev);
524 ret = ERR_PTR(-ENOMEM);
528 nd_set_link(nd, alias);
534 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
538 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
539 struct yaffs_obj *obj);
542 * Lookup is used to find objects in the fs
545 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
548 struct yaffs_obj *obj;
549 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
551 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
553 if(current != yaffs_dev_to_lc(dev)->readdir_process)
554 yaffs_gross_lock(dev);
557 (TSTR("yaffs_lookup for %d:%s\n"),
558 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name));
560 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir),
561 dentry->d_name.name);
563 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
565 /* Can't hold gross lock when calling yaffs_get_inode() */
566 if(current != yaffs_dev_to_lc(dev)->readdir_process)
567 yaffs_gross_unlock(dev);
571 (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
573 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
577 (TSTR("yaffs_loookup dentry \n")));
578 d_add(dentry, inode);
584 T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
588 d_add(dentry, inode);
594 #ifdef YAFFS_HAS_PUT_INODE
596 /* For now put inode is just for debugging
597 * Put inode is called when the inode **structure** is put.
599 static void yaffs_put_inode(struct inode *inode)
602 (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
603 atomic_read(&inode->i_count)));
609 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
611 /* Clear the association between the inode and
612 * the struct yaffs_obj.
614 obj->my_inode = NULL;
615 yaffs_inode_to_obj_lv(inode) = NULL;
617 /* If the object freeing was deferred, then the real
619 * This should fix the inode inconsistency problem.
621 yaffs_handle_defered_free(obj);
624 /* yaffs_evict_inode combines into one operation what was previously done in
625 * yaffs_clear_inode() and yaffs_delete_inode()
628 static void yaffs_evict_inode( struct inode *inode)
630 struct yaffs_obj *obj;
631 struct yaffs_dev *dev;
634 obj = yaffs_inode_to_obj(inode);
637 (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
638 atomic_read(&inode->i_count),
639 obj ? "object exists" : "null object"));
641 if (!inode->i_nlink && !is_bad_inode(inode))
643 truncate_inode_pages(&inode->i_data,0);
644 end_writeback(inode);
648 yaffs_gross_lock(dev);
650 yaffs_gross_unlock(dev);
654 yaffs_gross_lock(dev);
655 yaffs_unstitch_obj(inode,obj);
656 yaffs_gross_unlock(dev);
663 static int yaffs_file_flush(struct file *file, fl_owner_t id)
665 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
667 struct yaffs_dev *dev = obj->my_dev;
670 (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
671 obj->dirty ? "dirty" : "clean"));
673 yaffs_gross_lock(dev);
675 yaffs_flush_file(obj, 1, 0);
677 yaffs_gross_unlock(dev);
682 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
684 /* Lifted from jffs2 */
686 struct yaffs_obj *obj;
687 unsigned char *pg_buf;
690 struct yaffs_dev *dev;
693 (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
694 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
695 (unsigned)PAGE_CACHE_SIZE));
697 obj = yaffs_dentry_to_obj(f->f_dentry);
701 BUG_ON(!PageLocked(pg));
704 /* FIXME: Can kmap fail? */
706 yaffs_gross_lock(dev);
708 ret = yaffs_file_rd(obj, pg_buf,
709 pg->index << PAGE_CACHE_SHIFT,
712 yaffs_gross_unlock(dev);
718 ClearPageUptodate(pg);
725 flush_dcache_page(pg);
728 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
732 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
734 int ret = yaffs_readpage_nolock(f, pg);
739 static int yaffs_readpage(struct file *f, struct page *pg)
743 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
744 ret=yaffs_readpage_unlock(f, pg);
745 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
749 /* writepage inspired by/stolen from smbfs */
751 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
753 struct yaffs_dev *dev;
754 struct address_space *mapping = page->mapping;
756 unsigned long end_index;
758 struct yaffs_obj *obj;
765 inode = mapping->host;
768 i_size = i_size_read(inode);
770 end_index = i_size >> PAGE_CACHE_SHIFT;
772 if(page->index < end_index)
773 n_bytes = PAGE_CACHE_SIZE;
775 n_bytes = i_size & (PAGE_CACHE_SIZE -1);
777 if (page->index > end_index || !n_bytes) {
779 (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
780 (unsigned)(page->index << PAGE_CACHE_SHIFT),
781 (unsigned)inode->i_size));
783 (TSTR(" -> don't care!!\n")));
785 zero_user_segment(page,0,PAGE_CACHE_SIZE);
786 set_page_writeback(page);
788 end_page_writeback(page);
793 if(n_bytes != PAGE_CACHE_SIZE)
794 zero_user_segment(page,n_bytes,PAGE_CACHE_SIZE);
800 obj = yaffs_inode_to_obj(inode);
802 yaffs_gross_lock(dev);
805 (TSTR("yaffs_writepage at %08x, size %08x\n"),
806 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
808 (TSTR("writepag0: obj = %05x, ino = %05x\n"),
809 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
811 n_written = yaffs_wr_file(obj, buffer,
812 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
814 yaffs_touch_super(dev);
817 (TSTR("writepag1: obj = %05x, ino = %05x\n"),
818 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
820 yaffs_gross_unlock(dev);
823 set_page_writeback(page);
825 end_page_writeback(page);
828 return (n_written == n_bytes) ? 0 : -ENOSPC;
832 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
833 loff_t pos, unsigned len, unsigned flags,
834 struct page **pagep, void **fsdata)
836 struct page *pg = NULL;
837 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
843 pg = grab_cache_page_write_begin(mapping, index, flags);
851 (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
852 (int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
855 space_held = yaffs_hold_space(filp);
862 /* Update page if required */
864 if (!Page_Uptodate(pg))
865 ret = yaffs_readpage_nolock(filp, pg);
870 /* Happy path return */
871 T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
877 (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
879 yaffs_release_space(filp);
882 page_cache_release(pg);
888 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
889 loff_t pos, unsigned len, unsigned copied,
890 struct page *pg, void *fsdadata)
894 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
897 addr = kva + offset_into_page;
900 ("yaffs_write_end addr %p pos %x n_bytes %d\n",
901 addr,(unsigned)pos, copied));
903 ret = yaffs_file_write(filp, addr, copied, &pos);
907 (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
916 yaffs_release_space(filp);
918 page_cache_release(pg);
923 static void yaffs_fill_inode_from_obj(struct inode *inode, struct yaffs_obj *obj)
928 /* Check mode against the variant type and attempt to repair if broken. */
929 u32 mode = obj->yst_mode;
930 switch (obj->variant_type) {
931 case YAFFS_OBJECT_TYPE_FILE:
932 if (!S_ISREG(mode)) {
933 obj->yst_mode &= ~S_IFMT;
934 obj->yst_mode |= S_IFREG;
938 case YAFFS_OBJECT_TYPE_SYMLINK:
939 if (!S_ISLNK(mode)) {
940 obj->yst_mode &= ~S_IFMT;
941 obj->yst_mode |= S_IFLNK;
945 case YAFFS_OBJECT_TYPE_DIRECTORY:
946 if (!S_ISDIR(mode)) {
947 obj->yst_mode &= ~S_IFMT;
948 obj->yst_mode |= S_IFDIR;
952 case YAFFS_OBJECT_TYPE_UNKNOWN:
953 case YAFFS_OBJECT_TYPE_HARDLINK:
954 case YAFFS_OBJECT_TYPE_SPECIAL:
960 inode->i_flags |= S_NOATIME;
962 inode->i_ino = obj->obj_id;
963 inode->i_mode = obj->yst_mode;
964 inode->i_uid = obj->yst_uid;
965 inode->i_gid = obj->yst_gid;
967 inode->i_rdev = old_decode_dev(obj->yst_rdev);
969 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
970 inode->i_atime.tv_nsec = 0;
971 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
972 inode->i_mtime.tv_nsec = 0;
973 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
974 inode->i_ctime.tv_nsec = 0;
975 inode->i_size = yaffs_get_obj_length(obj);
976 inode->i_blocks = (inode->i_size + 511) >> 9;
978 inode->i_nlink = yaffs_get_obj_link_count(obj);
981 (TSTR("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
982 inode->i_mode, inode->i_uid, inode->i_gid,
983 (int)inode->i_size, atomic_read(&inode->i_count)));
985 switch (obj->yst_mode & S_IFMT) {
986 default: /* fifo, device or socket */
987 init_special_inode(inode, obj->yst_mode,
988 old_decode_dev(obj->yst_rdev));
990 case S_IFREG: /* file */
991 inode->i_op = &yaffs_file_inode_operations;
992 inode->i_fop = &yaffs_file_operations;
993 inode->i_mapping->a_ops =
994 &yaffs_file_address_operations;
996 case S_IFDIR: /* directory */
997 inode->i_op = &yaffs_dir_inode_operations;
998 inode->i_fop = &yaffs_dir_operations;
1000 case S_IFLNK: /* symlink */
1001 inode->i_op = &yaffs_symlink_inode_operations;
1005 yaffs_inode_to_obj_lv(inode) = obj;
1007 obj->my_inode = inode;
1011 (TSTR("yaffs_fill_inode invalid parameters\n")));
1016 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1017 struct yaffs_obj *obj)
1019 struct inode *inode;
1023 (TSTR("yaffs_get_inode for NULL super_block!!\n")));
1030 (TSTR("yaffs_get_inode for NULL object!!\n")));
1036 (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
1038 inode = Y_IGET(sb, obj->obj_id);
1042 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1043 /* iget also increments the inode's i_count */
1044 /* NB You can't be holding gross_lock or deadlock will happen! */
1049 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1052 struct yaffs_obj *obj;
1053 int n_written, ipos;
1054 struct inode *inode;
1055 struct yaffs_dev *dev;
1057 obj = yaffs_dentry_to_obj(f->f_dentry);
1061 yaffs_gross_lock(dev);
1063 inode = f->f_dentry->d_inode;
1065 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1066 ipos = inode->i_size;
1072 (TSTR("yaffs_file_write: hey obj is null!\n")));
1075 (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
1076 "to object %d at %d(%x)\n"),
1077 (unsigned) n, (unsigned) n, obj->obj_id, ipos,ipos));
1079 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1081 yaffs_touch_super(dev);
1084 (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
1085 (unsigned )n,(unsigned)n));
1087 if (n_written > 0) {
1090 if (ipos > inode->i_size) {
1091 inode->i_size = ipos;
1092 inode->i_blocks = (ipos + 511) >> 9;
1095 (TSTR("yaffs_file_write size updated to %d bytes, "
1097 ipos, (int)(inode->i_blocks)));
1101 yaffs_gross_unlock(dev);
1102 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1105 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1106 /* For now we just assume few parallel writes and check against a small number. */
1107 /* Todo: need to do this with a counter to handle parallel reads better */
1109 static ssize_t yaffs_hold_space(struct file *f)
1111 struct yaffs_obj *obj;
1112 struct yaffs_dev *dev;
1117 obj = yaffs_dentry_to_obj(f->f_dentry);
1121 yaffs_gross_lock(dev);
1123 n_free_chunks = yaffs_get_n_free_chunks(dev);
1125 yaffs_gross_unlock(dev);
1127 return (n_free_chunks > 20) ? 1 : 0;
1130 static void yaffs_release_space(struct file *f)
1132 struct yaffs_obj *obj;
1133 struct yaffs_dev *dev;
1136 obj = yaffs_dentry_to_obj(f->f_dentry);
1140 yaffs_gross_lock(dev);
1143 yaffs_gross_unlock(dev);
1147 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1155 offset += i_size_read(file->f_path.dentry->d_inode);
1158 offset += file->f_pos;
1163 if (offset != file->f_pos)
1164 file->f_pos = offset;
1173 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1175 struct yaffs_obj *obj;
1176 struct yaffs_dev *dev;
1177 struct yaffs_search_context *sc;
1178 struct inode *inode = f->f_dentry->d_inode;
1179 unsigned long offset, curoffs;
1180 struct yaffs_obj *l;
1183 char name[YAFFS_MAX_NAME_LENGTH + 1];
1185 obj = yaffs_dentry_to_obj(f->f_dentry);
1188 yaffs_gross_lock(dev);
1190 yaffs_dev_to_lc(dev)->readdir_process = current;
1194 sc = yaffs_new_search(obj);
1200 T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
1204 (TSTR("yaffs_readdir: entry . ino %d \n"),
1205 (int)inode->i_ino));
1206 yaffs_gross_unlock(dev);
1207 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
1208 yaffs_gross_lock(dev);
1211 yaffs_gross_lock(dev);
1217 (TSTR("yaffs_readdir: entry .. ino %d \n"),
1218 (int)f->f_dentry->d_parent->d_inode->i_ino));
1219 yaffs_gross_unlock(dev);
1220 if (filldir(dirent, "..", 2, offset,
1221 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
1222 yaffs_gross_lock(dev);
1225 yaffs_gross_lock(dev);
1232 /* If the directory has changed since the open or last call to
1233 readdir, rewind to after the 2 canned entries. */
1234 if (f->f_version != inode->i_version) {
1237 f->f_version = inode->i_version;
1240 while(sc->next_return){
1242 l = sc->next_return;
1243 if (curoffs >= offset) {
1244 int this_inode = yaffs_get_obj_inode(l);
1245 int this_type = yaffs_get_obj_type(l);
1247 yaffs_get_obj_name(l, name,
1248 YAFFS_MAX_NAME_LENGTH + 1);
1250 (TSTR("yaffs_readdir: %s inode %d\n"),
1251 name, yaffs_get_obj_inode(l)));
1253 yaffs_gross_unlock(dev);
1261 yaffs_gross_lock(dev);
1265 yaffs_gross_lock(dev);
1270 yaffs_search_advance(sc);
1274 yaffs_search_end(sc);
1275 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1276 yaffs_gross_unlock(dev);
1284 * File creation. Allocate an inode, and we're done..
1287 #define YCRED(x) (x->cred)
1289 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1292 struct inode *inode;
1294 struct yaffs_obj *obj = NULL;
1295 struct yaffs_dev *dev;
1297 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1299 int error = -ENOSPC;
1300 uid_t uid = YCRED(current)->fsuid;
1301 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1303 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1308 (TSTR("yaffs_mknod: parent object %d type %d\n"),
1309 parent->obj_id, parent->variant_type));
1312 (TSTR("yaffs_mknod: could not get parent object\n")));
1316 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
1317 "mode %x dev %x\n"),
1318 dentry->d_name.name, mode, rdev));
1320 dev = parent->my_dev;
1322 yaffs_gross_lock(dev);
1324 switch (mode & S_IFMT) {
1326 /* Special (socket, fifo, device...) */
1327 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
1328 obj = yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1329 gid, old_encode_dev(rdev));
1331 case S_IFREG: /* file */
1332 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
1333 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1336 case S_IFDIR: /* directory */
1338 (TSTR("yaffs_mknod: making directory\n")));
1339 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1342 case S_IFLNK: /* symlink */
1343 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
1344 obj = NULL; /* Do we ever get here? */
1348 /* Can not call yaffs_get_inode() with gross lock held */
1349 yaffs_gross_unlock(dev);
1352 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1353 d_instantiate(dentry, inode);
1354 update_dir_time(dir);
1356 (TSTR("yaffs_mknod created object %d count = %d\n"),
1357 obj->obj_id, atomic_read(&inode->i_count)));
1359 yaffs_fill_inode_from_obj(dir,parent);
1362 (TSTR("yaffs_mknod failed making object\n")));
1369 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1372 T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
1373 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1377 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1378 struct nameidata *n)
1380 T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
1381 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1384 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1388 struct yaffs_dev *dev;
1389 struct yaffs_obj *obj;
1392 (TSTR("yaffs_unlink %d:%s\n"),
1394 dentry->d_name.name));
1395 obj = yaffs_inode_to_obj(dir);
1398 yaffs_gross_lock(dev);
1400 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1402 if (ret_val == YAFFS_OK) {
1403 dentry->d_inode->i_nlink--;
1405 yaffs_gross_unlock(dev);
1406 mark_inode_dirty(dentry->d_inode);
1407 update_dir_time(dir);
1410 yaffs_gross_unlock(dev);
1417 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1418 struct dentry *dentry)
1420 struct inode *inode = old_dentry->d_inode;
1421 struct yaffs_obj *obj = NULL;
1422 struct yaffs_obj *link = NULL;
1423 struct yaffs_dev *dev;
1425 T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
1427 obj = yaffs_inode_to_obj(inode);
1430 yaffs_gross_lock(dev);
1432 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1433 link = yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1437 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1438 d_instantiate(dentry, old_dentry->d_inode);
1439 atomic_inc(&old_dentry->d_inode->i_count);
1441 (TSTR("yaffs_link link count %d i_count %d\n"),
1442 old_dentry->d_inode->i_nlink,
1443 atomic_read(&old_dentry->d_inode->i_count)));
1446 yaffs_gross_unlock(dev);
1449 update_dir_time(dir);
1456 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1457 const char *symname)
1459 struct yaffs_obj *obj;
1460 struct yaffs_dev *dev;
1461 uid_t uid = YCRED(current)->fsuid;
1462 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1464 T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
1466 dev = yaffs_inode_to_obj(dir)->my_dev;
1467 yaffs_gross_lock(dev);
1468 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1469 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1470 yaffs_gross_unlock(dev);
1473 struct inode *inode;
1475 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1476 d_instantiate(dentry, inode);
1477 update_dir_time(dir);
1478 T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
1481 T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
1487 static int yaffs_sync_object(struct file *file, int datasync)
1490 struct yaffs_obj *obj;
1491 struct yaffs_dev *dev;
1492 struct dentry *dentry = file->f_path.dentry;
1494 obj = yaffs_dentry_to_obj(dentry);
1498 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1499 (TSTR("yaffs_sync_object\n")));
1500 yaffs_gross_lock(dev);
1501 yaffs_flush_file(obj, 1, datasync);
1502 yaffs_gross_unlock(dev);
1507 * The VFS layer already does all the dentry stuff for rename.
1509 * NB: POSIX says you can rename an object over an old object of the same name
1511 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1512 struct inode *new_dir, struct dentry *new_dentry)
1514 struct yaffs_dev *dev;
1515 int ret_val = YAFFS_FAIL;
1516 struct yaffs_obj *target;
1518 T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
1519 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1521 yaffs_gross_lock(dev);
1523 /* Check if the target is an existing directory that is not empty. */
1524 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1525 new_dentry->d_name.name);
1529 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1530 !list_empty(&target->variant.dir_variant.children)) {
1532 T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
1534 ret_val = YAFFS_FAIL;
1536 /* Now does unlinking internally using shadowing mechanism */
1537 T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
1539 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1540 old_dentry->d_name.name,
1541 yaffs_inode_to_obj(new_dir),
1542 new_dentry->d_name.name);
1544 yaffs_gross_unlock(dev);
1546 if (ret_val == YAFFS_OK) {
1548 new_dentry->d_inode->i_nlink--;
1549 mark_inode_dirty(new_dentry->d_inode);
1552 update_dir_time(old_dir);
1553 if(old_dir != new_dir)
1554 update_dir_time(new_dir);
1561 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1563 struct inode *inode = dentry->d_inode;
1565 struct yaffs_dev *dev;
1568 (TSTR("yaffs_setattr of object %d\n"),
1569 yaffs_inode_to_obj(inode)->obj_id));
1571 /* Fail if a requested resize >= 2GB */
1572 if (attr->ia_valid & ATTR_SIZE &&
1573 (attr->ia_size >> 31))
1577 error = inode_change_ok(inode, attr);
1581 error = yaffs_vfs_setattr(inode, attr);
1582 T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
1583 if (attr->ia_valid & ATTR_SIZE){
1584 yaffs_vfs_setsize(inode,attr->ia_size);
1585 inode->i_blocks = (inode->i_size + 511) >> 9;
1588 dev = yaffs_inode_to_obj(inode)->my_dev;
1589 if (attr->ia_valid & ATTR_SIZE){
1590 T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
1591 (int)(attr->ia_size),(int)(attr->ia_size)));
1593 yaffs_gross_lock(dev);
1594 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1595 if(result == YAFFS_OK) {
1600 yaffs_gross_unlock(dev);
1605 (TSTR("yaffs_setattr done returning %d\n"),error));
1610 #ifdef CONFIG_YAFFS_XATTR
1611 int yaffs_setxattr(struct dentry *dentry, const char *name,
1612 const void *value, size_t size, int flags)
1614 struct inode *inode = dentry->d_inode;
1616 struct yaffs_dev *dev;
1617 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1620 (TSTR("yaffs_setxattr of object %d\n"),
1627 yaffs_gross_lock(dev);
1628 result = yaffs_set_xattrib(obj, name, value, size, flags);
1629 if(result == YAFFS_OK)
1633 yaffs_gross_unlock(dev);
1637 (TSTR("yaffs_setxattr done returning %d\n"),error));
1643 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
1646 struct inode *inode = dentry->d_inode;
1648 struct yaffs_dev *dev;
1649 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1652 (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
1653 name, obj->obj_id));
1657 yaffs_gross_lock(dev);
1658 error = yaffs_get_xattrib(obj, name, buff, size);
1659 yaffs_gross_unlock(dev);
1663 (TSTR("yaffs_getxattr done returning %d\n"),error));
1668 int yaffs_removexattr(struct dentry *dentry, const char *name)
1670 struct inode *inode = dentry->d_inode;
1672 struct yaffs_dev *dev;
1673 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1676 (TSTR("yaffs_removexattr of object %d\n"),
1683 yaffs_gross_lock(dev);
1684 result = yaffs_remove_xattrib(obj, name);
1685 if(result == YAFFS_OK)
1689 yaffs_gross_unlock(dev);
1693 (TSTR("yaffs_removexattr done returning %d\n"),error));
1698 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
1700 struct inode *inode = dentry->d_inode;
1702 struct yaffs_dev *dev;
1703 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1706 (TSTR("yaffs_listxattr of object %d\n"),
1712 yaffs_gross_lock(dev);
1713 error = yaffs_list_xattrib(obj, buff, size);
1714 yaffs_gross_unlock(dev);
1718 (TSTR("yaffs_listxattr done returning %d\n"),error));
1726 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1728 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1729 struct super_block *sb = dentry->d_sb;
1731 T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
1733 yaffs_gross_lock(dev);
1735 buf->f_type = YAFFS_MAGIC;
1736 buf->f_bsize = sb->s_blocksize;
1737 buf->f_namelen = 255;
1739 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1740 /* Do this if chunk size is not a power of 2 */
1742 uint64_t bytes_in_dev;
1743 uint64_t bytes_free;
1745 bytes_in_dev = ((uint64_t)((dev->param.end_block - dev->param.start_block + 1))) *
1746 ((uint64_t)(dev->param.chunks_per_block * dev->data_bytes_per_chunk));
1748 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
1749 buf->f_blocks = bytes_in_dev;
1751 bytes_free = ((uint64_t)(yaffs_get_n_free_chunks(dev))) *
1752 ((uint64_t)(dev->data_bytes_per_chunk));
1754 do_div(bytes_free, sb->s_blocksize);
1756 buf->f_bfree = bytes_free;
1758 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1761 (dev->param.end_block - dev->param.start_block + 1) *
1762 dev->param.chunks_per_block /
1763 (sb->s_blocksize / dev->data_bytes_per_chunk);
1765 yaffs_get_n_free_chunks(dev) /
1766 (sb->s_blocksize / dev->data_bytes_per_chunk);
1769 (dev->param.end_block - dev->param.start_block + 1) *
1770 dev->param.chunks_per_block *
1771 (dev->data_bytes_per_chunk / sb->s_blocksize);
1774 yaffs_get_n_free_chunks(dev) *
1775 (dev->data_bytes_per_chunk / sb->s_blocksize);
1780 buf->f_bavail = buf->f_bfree;
1782 yaffs_gross_unlock(dev);
1788 static void yaffs_flush_inodes(struct super_block *sb)
1791 struct yaffs_obj *obj;
1793 list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
1794 obj = yaffs_inode_to_obj(iptr);
1796 T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
1798 yaffs_flush_file(obj,1,0);
1804 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1806 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1810 yaffs_flush_inodes(sb);
1811 yaffs_update_dirty_dirs(dev);
1812 yaffs_flush_whole_cache(dev);
1814 yaffs_checkpoint_save(dev);
1818 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1820 unsigned erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
1821 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1822 unsigned scattered = 0; /* Free chunks not in an erased block */
1824 if(erased_chunks < dev->n_free_chunks)
1825 scattered = (dev->n_free_chunks - erased_chunks);
1827 if(!context->bg_running)
1829 else if(scattered < (dev->param.chunks_per_block * 2))
1831 else if(erased_chunks > dev->n_free_chunks/2)
1833 else if(erased_chunks > dev->n_free_chunks/4)
1839 static int yaffs_do_sync_fs(struct super_block *sb,
1840 int request_checkpoint)
1843 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1844 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1845 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1848 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1849 (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
1851 sb->s_dirt ? "dirty" : "clean",
1852 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1853 oneshot_checkpoint ? " one-shot" : "" ));
1855 yaffs_gross_lock(dev);
1856 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1857 oneshot_checkpoint) &&
1858 !dev->is_checkpointed;
1860 if (sb->s_dirt || do_checkpoint) {
1861 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1863 if(oneshot_checkpoint)
1864 yaffs_auto_checkpoint &= ~4;
1866 yaffs_gross_unlock(dev);
1872 * yaffs background thread functions .
1873 * yaffs_bg_thread_fn() the thread function
1874 * yaffs_bg_start() launches the background thread.
1875 * yaffs_bg_stop() cleans up the background thread.
1878 * The thread should only run after the yaffs is initialised
1879 * The thread should be stopped before yaffs is unmounted.
1880 * The thread should not do any writing while the fs is in read only.
1884 void yaffs_background_waker(unsigned long data)
1886 wake_up_process((struct task_struct *)data);
1889 static int yaffs_bg_thread_fn(void *data)
1891 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1892 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1893 unsigned long now = jiffies;
1894 unsigned long next_dir_update = now;
1895 unsigned long next_gc = now;
1896 unsigned long expires;
1897 unsigned int urgency;
1900 struct timer_list timer;
1902 T(YAFFS_TRACE_BACKGROUND,
1903 (TSTR("yaffs_background starting for dev %p\n"),
1907 while(context->bg_running){
1908 T(YAFFS_TRACE_BACKGROUND,
1909 (TSTR("yaffs_background\n")));
1911 if(kthread_should_stop())
1917 yaffs_gross_lock(dev);
1921 if(time_after(now, next_dir_update) && yaffs_bg_enable){
1922 yaffs_update_dirty_dirs(dev);
1923 next_dir_update = now + HZ;
1926 if(time_after(now,next_gc) && yaffs_bg_enable){
1927 if(!dev->is_checkpointed){
1928 urgency = yaffs_bg_gc_urgency(dev);
1929 gc_result = yaffs_bg_gc(dev, urgency);
1931 next_gc = now + HZ/20+1;
1932 else if(urgency > 0)
1933 next_gc = now + HZ/10+1;
1935 next_gc = now + HZ * 2;
1937 * gc not running so set to next_dir_update
1938 * to cut down on wake ups
1940 next_gc = next_dir_update;
1942 yaffs_gross_unlock(dev);
1943 expires = next_dir_update;
1944 if (time_before(next_gc,expires))
1946 if(time_before(expires,now))
1949 Y_INIT_TIMER(&timer);
1950 timer.expires = expires+1;
1951 timer.data = (unsigned long) current;
1952 timer.function = yaffs_background_waker;
1954 set_current_state(TASK_INTERRUPTIBLE);
1957 del_timer_sync(&timer);
1963 static int yaffs_bg_start(struct yaffs_dev *dev)
1966 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1971 context->bg_running = 1;
1973 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1974 (void *)dev,"yaffs-bg-%d",context->mount_id);
1976 if(IS_ERR(context->bg_thread)){
1977 retval = PTR_ERR(context->bg_thread);
1978 context->bg_thread = NULL;
1979 context->bg_running = 0;
1984 static void yaffs_bg_stop(struct yaffs_dev *dev)
1986 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1988 ctxt->bg_running = 0;
1990 if( ctxt->bg_thread){
1991 kthread_stop(ctxt->bg_thread);
1992 ctxt->bg_thread = NULL;
1997 static void yaffs_write_super(struct super_block *sb)
1999 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2001 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2002 (TSTR("yaffs_write_super%s\n"),
2003 request_checkpoint ? " checkpt" : ""));
2005 yaffs_do_sync_fs(sb, request_checkpoint);
2010 static int yaffs_sync_fs(struct super_block *sb, int wait)
2012 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2014 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2015 (TSTR("yaffs_sync_fs%s\n"),
2016 request_checkpoint ? " checkpt" : ""));
2018 yaffs_do_sync_fs(sb, request_checkpoint);
2023 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2025 struct inode *inode;
2026 struct yaffs_obj *obj;
2027 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2030 (TSTR("yaffs_iget for %lu\n"), ino));
2032 inode = iget_locked(sb, ino);
2034 return ERR_PTR(-ENOMEM);
2035 if (!(inode->i_state & I_NEW))
2038 /* NB This is called as a side effect of other functions, but
2039 * we had to release the lock to prevent deadlocks, so
2040 * need to lock again.
2043 yaffs_gross_lock(dev);
2045 obj = yaffs_find_by_number(dev, inode->i_ino);
2047 yaffs_fill_inode_from_obj(inode, obj);
2049 yaffs_gross_unlock(dev);
2051 unlock_new_inode(inode);
2055 static LIST_HEAD(yaffs_context_list);
2056 struct semaphore yaffs_context_lock;
2058 static void yaffs_put_super(struct super_block *sb)
2060 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2062 T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
2064 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2065 (TSTR("Shutting down yaffs background thread\n")));
2067 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2068 (TSTR("yaffs background thread shut down\n")));
2070 yaffs_gross_lock(dev);
2072 yaffs_flush_super(sb,1);
2074 if (yaffs_dev_to_lc(dev)->put_super_fn)
2075 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2078 yaffs_deinitialise(dev);
2080 yaffs_gross_unlock(dev);
2082 down(&yaffs_context_lock);
2083 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2084 up(&yaffs_context_lock);
2086 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2087 YFREE(yaffs_dev_to_lc(dev)->spare_buffer);
2088 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2095 static void yaffs_mtd_put_super(struct super_block *sb)
2097 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2102 put_mtd_device(mtd);
2106 static void yaffs_touch_super(struct yaffs_dev *dev)
2108 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2110 T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
2115 struct yaffs_options {
2117 int skip_checkpoint_read;
2118 int skip_checkpoint_write;
2121 int tags_ecc_overridden;
2122 int lazy_loading_enabled;
2123 int lazy_loading_overridden;
2124 int empty_lost_and_found;
2125 int empty_lost_and_found_overridden;
2128 #define MAX_OPT_LEN 30
2129 static int yaffs_parse_options(struct yaffs_options *options, const char *options_str)
2131 char cur_opt[MAX_OPT_LEN + 1];
2135 /* Parse through the options which is a comma seperated list */
2137 while (options_str && *options_str && !error) {
2138 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2141 while(*options_str == ',')
2144 while (*options_str && *options_str != ',') {
2145 if (p < MAX_OPT_LEN) {
2146 cur_opt[p] = *options_str;
2152 if (!strcmp(cur_opt, "inband-tags"))
2153 options->inband_tags = 1;
2154 else if (!strcmp(cur_opt, "tags-ecc-off")){
2155 options->tags_ecc_on = 0;
2156 options->tags_ecc_overridden=1;
2157 } else if (!strcmp(cur_opt, "tags-ecc-on")){
2158 options->tags_ecc_on = 1;
2159 options->tags_ecc_overridden = 1;
2160 } else if (!strcmp(cur_opt, "lazy-loading-off")){
2161 options->lazy_loading_enabled = 0;
2162 options->lazy_loading_overridden=1;
2163 } else if (!strcmp(cur_opt, "lazy-loading-on")){
2164 options->lazy_loading_enabled = 1;
2165 options->lazy_loading_overridden = 1;
2166 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
2167 options->empty_lost_and_found = 0;
2168 options->empty_lost_and_found_overridden=1;
2169 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
2170 options->empty_lost_and_found = 1;
2171 options->empty_lost_and_found_overridden=1;
2172 } else if (!strcmp(cur_opt, "no-cache"))
2173 options->no_cache = 1;
2174 else if (!strcmp(cur_opt, "no-checkpoint-read"))
2175 options->skip_checkpoint_read = 1;
2176 else if (!strcmp(cur_opt, "no-checkpoint-write"))
2177 options->skip_checkpoint_write = 1;
2178 else if (!strcmp(cur_opt, "no-checkpoint")) {
2179 options->skip_checkpoint_read = 1;
2180 options->skip_checkpoint_write = 1;
2182 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2191 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2192 struct super_block *sb,
2193 void *data, int silent)
2196 struct inode *inode = NULL;
2197 struct dentry *root;
2198 struct yaffs_dev *dev = 0;
2199 char devname_buf[BDEVNAME_SIZE + 1];
2200 struct mtd_info *mtd;
2202 char *data_str = (char *)data;
2203 struct yaffs_linux_context *context = NULL;
2204 struct yaffs_param *param;
2208 struct yaffs_options options;
2212 struct yaffs_linux_context *context_iterator;
2213 struct list_head *l;
2215 sb->s_magic = YAFFS_MAGIC;
2216 sb->s_op = &yaffs_super_ops;
2217 sb->s_flags |= MS_NOATIME;
2219 read_only =((sb->s_flags & MS_RDONLY) != 0);
2221 sb->s_export_op = &yaffs_export_ops;
2224 printk(KERN_INFO "yaffs: sb is NULL\n");
2225 else if (!sb->s_dev)
2226 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2227 else if (!yaffs_devname(sb, devname_buf))
2228 printk(KERN_INFO "yaffs: devname is NULL\n");
2230 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2232 yaffs_devname(sb, devname_buf),
2233 read_only ? "ro" : "rw");
2238 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2240 memset(&options, 0, sizeof(options));
2242 if (yaffs_parse_options(&options, data_str)) {
2243 /* Option parsing failed */
2248 sb->s_blocksize = PAGE_CACHE_SIZE;
2249 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2252 (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
2254 (TSTR("yaffs_read_super: block size %d\n"),
2255 (int)(sb->s_blocksize)));
2257 T(YAFFS_TRACE_ALWAYS,
2258 (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
2259 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2260 yaffs_devname(sb, devname_buf)));
2262 /* Check it's an mtd device..... */
2263 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2264 return NULL; /* This isn't an mtd device */
2266 /* Get the device */
2267 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2269 T(YAFFS_TRACE_ALWAYS,
2270 (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
2274 /* Check it's NAND */
2275 if (mtd->type != MTD_NANDFLASH) {
2276 T(YAFFS_TRACE_ALWAYS,
2277 (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
2282 T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
2283 T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
2284 T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
2285 T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
2286 T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
2287 T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
2288 T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
2289 T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2290 T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
2291 T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
2292 T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
2294 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2296 if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2297 T(YAFFS_TRACE_ALWAYS,
2298 (TSTR("yaffs: auto selecting yaffs2\n")));
2302 /* Added NCB 26/5/2006 for completeness */
2303 if (yaffs_version == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
2304 T(YAFFS_TRACE_ALWAYS,
2305 (TSTR("yaffs: auto selecting yaffs1\n")));
2311 if (yaffs_version == 2) {
2312 /* Check for version 2 style functions */
2314 !mtd->block_isbad ||
2315 !mtd->block_markbad ||
2318 !mtd->read_oob || !mtd->write_oob) {
2319 T(YAFFS_TRACE_ALWAYS,
2320 (TSTR("yaffs: MTD device does not support required "
2325 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2326 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2327 !options.inband_tags) {
2328 T(YAFFS_TRACE_ALWAYS,
2329 (TSTR("yaffs: MTD device does not have the "
2330 "right page sizes\n")));
2334 /* Check for V1 style functions */
2338 !mtd->read_oob || !mtd->write_oob) {
2339 T(YAFFS_TRACE_ALWAYS,
2340 (TSTR("yaffs: MTD device does not support required "
2345 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2346 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2347 T(YAFFS_TRACE_ALWAYS,
2348 (TSTR("yaffs: MTD device does not support have the "
2349 "right page sizes\n")));
2354 /* OK, so if we got here, we have an MTD that's NAND and looks
2355 * like it has the right capabilities
2356 * Set the struct yaffs_dev up for mtd
2359 if (!read_only && !(mtd->flags & MTD_WRITEABLE)){
2361 printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
2362 sb->s_flags |= MS_RDONLY;
2365 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2366 context = kmalloc(sizeof(struct yaffs_linux_context),GFP_KERNEL);
2368 if(!dev || !context ){
2378 /* Deep shit could not allocate device structure */
2379 T(YAFFS_TRACE_ALWAYS,
2380 (TSTR("yaffs_read_super: Failed trying to allocate "
2381 "struct yaffs_dev. \n")));
2384 memset(dev, 0, sizeof(struct yaffs_dev));
2385 param = &(dev->param);
2387 memset(context,0,sizeof(struct yaffs_linux_context));
2388 dev->os_context = context;
2389 INIT_LIST_HEAD(&(context->context_list));
2391 context->super = sb;
2393 dev->read_only = read_only;
2395 sb->s_fs_info = dev;
2397 dev->driver_context = mtd;
2398 param->name = mtd->name;
2400 /* Set up the memory size parameters.... */
2402 n_blocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2404 param->start_block = 0;
2405 param->end_block = n_blocks - 1;
2406 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2407 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2408 param->n_reserved_blocks = 5;
2409 param->n_caches = (options.no_cache) ? 0 : 10;
2410 param->inband_tags = options.inband_tags;
2412 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2413 param->disable_lazy_load = 1;
2415 #ifdef CONFIG_YAFFS_XATTR
2416 param->enable_xattr = 1;
2418 if(options.lazy_loading_overridden)
2419 param->disable_lazy_load = !options.lazy_loading_enabled;
2421 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2422 param->no_tags_ecc = 1;
2425 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2427 param->defered_dir_update = 1;
2430 if(options.tags_ecc_overridden)
2431 param->no_tags_ecc = !options.tags_ecc_on;
2433 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2434 param->empty_lost_n_found = 1;
2437 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2438 param->refresh_period = 0;
2440 param->refresh_period = 500;
2443 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2444 param->always_check_erased = 1;
2447 if(options.empty_lost_and_found_overridden)
2448 param->empty_lost_n_found = options.empty_lost_and_found;
2450 /* ... and the functions. */
2451 if (yaffs_version == 2) {
2452 param->write_chunk_tags_fn =
2453 nandmtd2_write_chunk_tags;
2454 param->read_chunk_tags_fn =
2455 nandmtd2_read_chunk_tags;
2456 param->bad_block_fn = nandmtd2_mark_block_bad;
2457 param->query_block_fn = nandmtd2_query_block;
2458 yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize);
2459 param->is_yaffs2 = 1;
2460 param->total_bytes_per_chunk = mtd->writesize;
2461 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2462 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2464 param->start_block = 0;
2465 param->end_block = n_blocks - 1;
2467 /* use the MTD interface in yaffs_mtdif1.c */
2468 param->write_chunk_tags_fn =
2469 nandmtd1_write_chunk_tags;
2470 param->read_chunk_tags_fn =
2471 nandmtd1_read_chunk_tags;
2472 param->bad_block_fn = nandmtd1_mark_block_bad;
2473 param->query_block_fn = nandmtd1_query_block;
2474 param->is_yaffs2 = 0;
2476 /* ... and common functions */
2477 param->erase_fn = nandmtd_erase_block;
2478 param->initialise_flash_fn = nandmtd_initialise;
2480 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2482 param->sb_dirty_fn = yaffs_touch_super;
2483 param->gc_control = yaffs_gc_control_callback;
2485 yaffs_dev_to_lc(dev)->super= sb;
2488 #ifndef CONFIG_YAFFS_DOES_ECC
2489 param->use_nand_ecc = 1;
2492 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2493 param->wide_tnodes_disabled = 1;
2496 param->skip_checkpt_rd = options.skip_checkpoint_read;
2497 param->skip_checkpt_wr = options.skip_checkpoint_write;
2499 down(&yaffs_context_lock);
2500 /* Get a mount id */
2502 for(mount_id=0; ! found; mount_id++){
2504 list_for_each(l,&yaffs_context_list){
2505 context_iterator = list_entry(l,struct yaffs_linux_context,context_list);
2506 if(context_iterator->mount_id == mount_id)
2510 context->mount_id = mount_id;
2512 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list), &yaffs_context_list);
2513 up(&yaffs_context_lock);
2515 /* Directory search handling...*/
2516 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2517 param->remove_obj_fn = yaffs_remove_obj_callback;
2519 init_MUTEX(&(yaffs_dev_to_lc(dev)->gross_lock));
2521 yaffs_gross_lock(dev);
2523 err = yaffs_guts_initialise(dev);
2526 (TSTR("yaffs_read_super: guts initialised %s\n"),
2527 (err == YAFFS_OK) ? "OK" : "FAILED"));
2530 yaffs_bg_start(dev);
2532 if(!context->bg_thread)
2533 param->defered_dir_update = 0;
2536 /* Release lock before yaffs_get_inode() */
2537 yaffs_gross_unlock(dev);
2539 /* Create root inode */
2540 if (err == YAFFS_OK)
2541 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2547 inode->i_op = &yaffs_dir_inode_operations;
2548 inode->i_fop = &yaffs_dir_operations;
2550 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
2552 root = d_alloc_root(inode);
2554 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
2561 sb->s_dirt = !dev->is_checkpointed;
2562 T(YAFFS_TRACE_ALWAYS,
2563 (TSTR("yaffs_read_super: is_checkpointed %d\n"),
2564 dev->is_checkpointed));
2566 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
2571 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2574 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2577 static int yaffs_read_super(struct file_system_type *fs,
2578 int flags, const char *dev_name,
2579 void *data, struct vfsmount *mnt)
2582 return get_sb_bdev(fs, flags, dev_name, data,
2583 yaffs_internal_read_super_mtd, mnt);
2586 static struct file_system_type yaffs_fs_type = {
2587 .owner = THIS_MODULE,
2589 .get_sb = yaffs_read_super,
2590 .kill_sb = kill_block_super,
2591 .fs_flags = FS_REQUIRES_DEV,
2595 #ifdef CONFIG_YAFFS_YAFFS2
2597 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2600 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2603 static int yaffs2_read_super(struct file_system_type *fs,
2604 int flags, const char *dev_name, void *data,
2605 struct vfsmount *mnt)
2607 return get_sb_bdev(fs, flags, dev_name, data,
2608 yaffs2_internal_read_super_mtd, mnt);
2611 static struct file_system_type yaffs2_fs_type = {
2612 .owner = THIS_MODULE,
2614 .get_sb = yaffs2_read_super,
2615 .kill_sb = kill_block_super,
2616 .fs_flags = FS_REQUIRES_DEV,
2618 #endif /* CONFIG_YAFFS_YAFFS2 */
2620 static struct proc_dir_entry *my_proc_entry;
2621 static struct proc_dir_entry *debug_proc_entry;
2623 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev * dev)
2625 buf += sprintf(buf, "start_block........... %d\n", dev->param.start_block);
2626 buf += sprintf(buf, "end_block............. %d\n", dev->param.end_block);
2627 buf += sprintf(buf, "total_bytes_per_chunk. %d\n", dev->param.total_bytes_per_chunk);
2628 buf += sprintf(buf, "use_nand_ecc.......... %d\n", dev->param.use_nand_ecc);
2629 buf += sprintf(buf, "no_tags_ecc........... %d\n", dev->param.no_tags_ecc);
2630 buf += sprintf(buf, "is_yaffs2............. %d\n", dev->param.is_yaffs2);
2631 buf += sprintf(buf, "inband_tags........... %d\n", dev->param.inband_tags);
2632 buf += sprintf(buf, "empty_lost_n_found.... %d\n", dev->param.empty_lost_n_found);
2633 buf += sprintf(buf, "disable_lazy_load..... %d\n", dev->param.disable_lazy_load);
2634 buf += sprintf(buf, "refresh_period........ %d\n", dev->param.refresh_period);
2635 buf += sprintf(buf, "n_caches.............. %d\n", dev->param.n_caches);
2636 buf += sprintf(buf, "n_reserved_blocks..... %d\n", dev->param.n_reserved_blocks);
2637 buf += sprintf(buf, "always_check_erased... %d\n", dev->param.always_check_erased);
2639 buf += sprintf(buf, "\n");
2645 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev * dev)
2647 buf += sprintf(buf, "data_bytes_per_chunk.. %d\n", dev->data_bytes_per_chunk);
2648 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2649 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2650 buf += sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2651 buf += sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2652 buf += sprintf(buf, "\n");
2653 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2654 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2655 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2656 buf += sprintf(buf, "\n");
2657 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2658 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2659 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2660 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2661 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2662 buf += sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2663 buf += sprintf(buf, "oldest_dirty_gc_count. %u\n", dev->oldest_dirty_gc_count);
2664 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2665 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2666 buf += sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
2667 buf += sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2668 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2669 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2670 buf += sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2671 buf += sprintf(buf, "n_tags_ecc_unfixed.... %u\n", dev->n_tags_ecc_unfixed);
2672 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2673 buf += sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2674 buf += sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2675 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2676 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2681 static int yaffs_proc_read(char *page,
2683 off_t offset, int count, int *eof, void *data)
2685 struct list_head *item;
2690 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2691 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2692 * This also assumes the user has posted a read buffer large
2693 * enough to hold the complete output; but that's life in /proc.
2698 /* Print header first */
2700 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__"\n");
2702 buf += sprintf(buf,"\n");
2706 down(&yaffs_context_lock);
2708 /* Locate and print the Nth entry. Order N-squared but N is small. */
2709 list_for_each(item, &yaffs_context_list) {
2710 struct yaffs_linux_context *dc = list_entry(item, struct yaffs_linux_context, context_list);
2711 struct yaffs_dev *dev = dc->dev;
2713 if (n < (step & ~1)) {
2718 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
2719 buf = yaffs_dump_dev_part0(buf, dev);
2721 buf = yaffs_dump_dev_part1(buf, dev);
2725 up(&yaffs_context_lock);
2728 return buf - page < count ? buf - page : count;
2731 static int yaffs_stats_proc_read(char *page,
2733 off_t offset, int count, int *eof, void *data)
2735 struct list_head *item;
2739 down(&yaffs_context_lock);
2741 /* Locate and print the Nth entry. Order N-squared but N is small. */
2742 list_for_each(item, &yaffs_context_list) {
2743 struct yaffs_linux_context *dc = list_entry(item, struct yaffs_linux_context, context_list);
2744 struct yaffs_dev *dev = dc->dev;
2748 erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
2750 buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
2751 n, dev->n_free_chunks, erased_chunks,
2752 dev->bg_gcs, dev->oldest_dirty_gc_count,
2753 dev->n_obj, dev->n_tnodes);
2755 up(&yaffs_context_lock);
2758 return buf - page < count ? buf - page : count;
2762 * Set the verbosity of the warnings and error messages.
2764 * Note that the names can only be a..z or _ with the current code.
2769 unsigned mask_bitfield;
2771 {"allocate", YAFFS_TRACE_ALLOCATE},
2772 {"always", YAFFS_TRACE_ALWAYS},
2773 {"background", YAFFS_TRACE_BACKGROUND},
2774 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2775 {"buffers", YAFFS_TRACE_BUFFERS},
2776 {"bug", YAFFS_TRACE_BUG},
2777 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2778 {"deletion", YAFFS_TRACE_DELETION},
2779 {"erase", YAFFS_TRACE_ERASE},
2780 {"error", YAFFS_TRACE_ERROR},
2781 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2782 {"gc", YAFFS_TRACE_GC},
2783 {"lock", YAFFS_TRACE_LOCK},
2784 {"mtd", YAFFS_TRACE_MTD},
2785 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2786 {"os", YAFFS_TRACE_OS},
2787 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2788 {"scan", YAFFS_TRACE_SCAN},
2789 {"tracing", YAFFS_TRACE_TRACING},
2790 {"sync", YAFFS_TRACE_SYNC},
2791 {"write", YAFFS_TRACE_WRITE},
2793 {"verify", YAFFS_TRACE_VERIFY},
2794 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2795 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2796 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2798 {"all", 0xffffffff},
2803 #define MAX_MASK_NAME_LENGTH 40
2804 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
2805 unsigned long count, void *data)
2807 unsigned rg = 0, mask_bitfield;
2811 char substring[MAX_MASK_NAME_LENGTH + 1];
2817 rg = yaffs_trace_mask;
2819 while (!done && (pos < count)) {
2821 while ((pos < count) && isspace(buf[pos]))
2838 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2840 if (end > buf + pos) {
2841 mask_name = "numeral";
2842 len = end - (buf + pos);
2846 for (x = buf + pos, i = 0;
2847 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2848 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2850 substring[i] = '\0';
2852 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2853 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2854 mask_name = mask_flags[i].mask_name;
2855 mask_bitfield = mask_flags[i].mask_bitfield;
2862 if (mask_name != NULL) {
2866 rg &= ~mask_bitfield;
2869 rg |= mask_bitfield;
2875 rg |= mask_bitfield;
2881 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
2883 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
2885 if (rg & YAFFS_TRACE_ALWAYS) {
2886 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2888 flag = ((rg & mask_flags[i].mask_bitfield) ==
2889 mask_flags[i].mask_bitfield) ? '+' : '-';
2890 printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2898 static int yaffs_proc_write(struct file *file, const char *buf,
2899 unsigned long count, void *data)
2901 return yaffs_proc_write_trace_options(file, buf, count, data);
2904 /* Stuff to handle installation of file systems */
2905 struct file_system_to_install {
2906 struct file_system_type *fst;
2910 static struct file_system_to_install fs_to_install[] = {
2911 {&yaffs_fs_type, 0},
2912 {&yaffs2_fs_type, 0},
2916 static int __init init_yaffs_fs(void)
2919 struct file_system_to_install *fsinst;
2921 T(YAFFS_TRACE_ALWAYS,
2922 (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
2924 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2925 T(YAFFS_TRACE_ALWAYS,
2926 (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
2932 init_MUTEX(&yaffs_context_lock);
2934 /* Install the proc_fs entries */
2935 my_proc_entry = create_proc_entry("yaffs",
2939 if (my_proc_entry) {
2940 my_proc_entry->write_proc = yaffs_proc_write;
2941 my_proc_entry->read_proc = yaffs_proc_read;
2942 my_proc_entry->data = NULL;
2946 debug_proc_entry = create_proc_entry("yaffs_stats",
2950 if (debug_proc_entry) {
2951 debug_proc_entry->write_proc = NULL;
2952 debug_proc_entry->read_proc = yaffs_stats_proc_read;
2953 debug_proc_entry->data = NULL;
2957 /* Now add the file system entries */
2959 fsinst = fs_to_install;
2961 while (fsinst->fst && !error) {
2962 error = register_filesystem(fsinst->fst);
2964 fsinst->installed = 1;
2968 /* Any errors? uninstall */
2970 fsinst = fs_to_install;
2972 while (fsinst->fst) {
2973 if (fsinst->installed) {
2974 unregister_filesystem(fsinst->fst);
2975 fsinst->installed = 0;
2984 static void __exit exit_yaffs_fs(void)
2987 struct file_system_to_install *fsinst;
2989 T(YAFFS_TRACE_ALWAYS,
2990 (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
2992 remove_proc_entry("yaffs", YPROC_ROOT);
2993 remove_proc_entry("yaffs_stats", YPROC_ROOT);
2995 fsinst = fs_to_install;
2997 while (fsinst->fst) {
2998 if (fsinst->installed) {
2999 unregister_filesystem(fsinst->fst);
3000 fsinst->installed = 0;
3006 module_init(init_yaffs_fs)
3007 module_exit(exit_yaffs_fs)
3009 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3010 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3011 MODULE_LICENSE("GPL");