X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_fs.c;h=6eb356c81e6e4276c0ca88813e7b83082b788bd9;hp=aaf3f0b3ac806572100b02699b20c7f704186d41;hb=6db5aca55acb7c8af07c8ec90ba8dd9085ab0895;hpb=8b140dd328588fc3fc38931fa5bce2c4d6e1d9e5

diff --git a/yaffs_fs.c b/yaffs_fs.c
index aaf3f0b..6eb356c 100644
--- a/yaffs_fs.c
+++ b/yaffs_fs.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2009 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -31,19 +31,21 @@
  * >> inode->u.generic_ip points to the associated yaffs_Object.
  */
 
-const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.101 2010-03-15 22:27:15 charles Exp $";
-extern const char *yaffs_guts_c_version;
-
 #include <linux/version.h>
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
 #define YAFFS_COMPILE_BACKGROUND
 #endif
 
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
+#define YAFFS_COMPILE_EXPORTFS
+#endif
+
+
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 #include <linux/config.h>
 #endif
+
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -57,21 +59,22 @@ extern const char *yaffs_guts_c_version;
 #include <linux/string.h>
 #include <linux/ctype.h>
 
+#ifdef YAFFS_COMPILE_EXPORTFS
+#include <linux/exportfs.h>
+#endif
+
 #ifdef YAFFS_COMPILE_BACKGROUND
 #include <linux/kthread.h>
 #include <linux/delay.h>
+#include <linux/freezer.h>
 #endif
 
-
-#include "asm/div64.h"
-
-
-#define LOCK_TRACE 0
+#include <asm/div64.h>
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 
-#include <linux/statfs.h>	/* Added NCB 15-8-2003 */
 #include <linux/statfs.h>
+
 #define UnlockPage(p) unlock_page(p)
 #define Page_Uptodate(page)	test_bit(PG_uptodate, &(page)->flags)
 
@@ -123,6 +126,7 @@ static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 #endif
 
 #include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
 
 #include "yportenv.h"
 #include "yaffs_trace.h"
@@ -130,7 +134,6 @@ static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 
 #include "yaffs_linux.h"
 
-#include <linux/mtd/mtd.h>
 #include "yaffs_mtdif.h"
 #include "yaffs_mtdif1.h"
 #include "yaffs_mtdif2.h"
@@ -138,16 +141,19 @@ static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 unsigned int yaffs_auto_checkpoint = 1;
+unsigned int yaffs_gc_control = 1;
 
 /* Module Parameters */
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 module_param(yaffs_traceMask, uint, 0644);
 module_param(yaffs_wr_attempts, uint, 0644);
 module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
 #else
 MODULE_PARM(yaffs_traceMask, "i");
 MODULE_PARM(yaffs_wr_attempts, "i");
 MODULE_PARM(yaffs_auto_checkpoint, "i");
+MODULE_PARM(yaffs_gc_control, "i");
 #endif
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
@@ -163,8 +169,6 @@ static void yaffs_read_inode(struct inode *inode);
 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 #endif
 
-/*#define T(x) printk x */
-
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
 #else
@@ -283,6 +287,7 @@ static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 #else
 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
 #endif
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
 
 static struct address_space_operations yaffs_file_address_operations = {
 	.readpage = yaffs_readpage,
@@ -375,6 +380,7 @@ static const struct file_operations yaffs_dir_operations = {
 	.read = generic_read_dir,
 	.readdir = yaffs_readdir,
 	.fsync = yaffs_sync_object,
+	.llseek = yaffs_dir_llseek,
 };
 
 static const struct super_operations yaffs_super_ops = {
@@ -392,20 +398,90 @@ static const struct super_operations yaffs_super_ops = {
 	.sync_fs = yaffs_sync_fs,
 	.write_super = yaffs_write_super,
 };
+
+static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
+{
+	return yaffs_gc_control;
+}
                 	                                                                                          	
 static void yaffs_GrossLock(yaffs_Device *dev)
 {
-	T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
 	down(&(yaffs_DeviceToContext(dev)->grossLock));
-	T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
 }
 
 static void yaffs_GrossUnlock(yaffs_Device *dev)
 {
-	T(LOCK_TRACE && YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
+	T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
 	up(&(yaffs_DeviceToContext(dev)->grossLock));
 }
 
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *
+yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
+{
+	return Y_IGET(sb, ino);
+}
+
+static struct dentry *
+yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
+}
+
+static struct dentry *
+ yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+	struct super_block *sb = dentry->d_inode->i_sb;
+	struct dentry *parent = ERR_PTR(-ENOENT);
+	struct inode *inode;
+	unsigned long parent_ino;
+	yaffs_Object *d_obj;
+	yaffs_Object *parent_obj;
+
+	d_obj = yaffs_InodeToObject(dentry->d_inode);
+
+	if (d_obj) {
+		parent_obj = d_obj->parent;
+		if (parent_obj) {
+			parent_ino = yaffs_GetObjectInode(parent_obj);
+			inode = Y_IGET(sb, parent_ino);
+
+			if (IS_ERR(inode)) {
+				parent = ERR_CAST(inode);
+			} else {
+				parent = d_obtain_alias(inode);
+				if (!IS_ERR(parent)) {
+					parent = ERR_PTR(-ENOMEM);
+					iput(inode);
+				}
+			}
+		}
+	}
+
+	return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops =
+{
+	.fh_to_dentry = yaffs2_fh_to_dentry,
+	.fh_to_parent = yaffs2_fh_to_parent,
+	.get_parent = yaffs2_get_parent,
+} ;
+
+#endif
 
 /*-----------------------------------------------------------------*/
 /* Directory search context allows us to unlock access to yaffs during
@@ -594,10 +670,11 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 
 	yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 
-	yaffs_GrossLock(dev);
+	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+		yaffs_GrossLock(dev);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_lookup for %d:%s\n",
+		(TSTR("yaffs_lookup for %d:%s\n"),
 		yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
 
 	obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
@@ -606,17 +683,18 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 	obj = yaffs_GetEquivalentObject(obj);	/* in case it was a hardlink */
 
 	/* Can't hold gross lock when calling yaffs_get_inode() */
-	yaffs_GrossUnlock(dev);
+	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+		yaffs_GrossUnlock(dev);
 
 	if (obj) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_lookup found %d\n", obj->objectId));
+			(TSTR("yaffs_lookup found %d\n"), obj->objectId));
 
 		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 
 		if (inode) {
 			T(YAFFS_TRACE_OS,
-				("yaffs_loookup dentry \n"));
+				(TSTR("yaffs_loookup dentry \n")));
 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
  * d_add even if NULL inode */
 #if 0
@@ -629,7 +707,7 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 		}
 
 	} else {
-		T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
+		T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
 
 	}
 
@@ -649,7 +727,7 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 static void yaffs_put_inode(struct inode *inode)
 {
 	T(YAFFS_TRACE_OS,
-		("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
+		(TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
 		atomic_read(&inode->i_count)));
 
 }
@@ -664,7 +742,7 @@ static void yaffs_clear_inode(struct inode *inode)
 	obj = yaffs_InodeToObject(inode);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
+		(TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 		atomic_read(&inode->i_count),
 		obj ? "object exists" : "null object"));
 
@@ -701,7 +779,7 @@ static void yaffs_delete_inode(struct inode *inode)
 	yaffs_Device *dev;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
+		(TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 		atomic_read(&inode->i_count),
 		obj ? "object exists" : "null object"));
 
@@ -728,7 +806,7 @@ static int yaffs_file_flush(struct file *file)
 	yaffs_Device *dev = obj->myDev;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_file_flush object %d (%s)\n", obj->objectId,
+		(TSTR("yaffs_file_flush object %d (%s)\n"), obj->objectId,
 		obj->dirty ? "dirty" : "clean"));
 
 	yaffs_GrossLock(dev);
@@ -750,9 +828,10 @@ static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 
 	yaffs_Device *dev;
 
-	T(YAFFS_TRACE_OS, ("yaffs_readpage_nolock at %08x, size %08x\n",
-			(unsigned)(pg->index << PAGE_CACHE_SHIFT),
-			(unsigned)PAGE_CACHE_SIZE));
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
+		(unsigned)(pg->index << PAGE_CACHE_SHIFT),
+		(unsigned)PAGE_CACHE_SIZE));
 
 	obj = yaffs_DentryToObject(f->f_dentry);
 
@@ -790,7 +869,7 @@ static int yaffs_readpage_nolock(struct file *f, struct page *pg)
 	flush_dcache_page(pg);
 	kunmap(pg);
 
-	T(YAFFS_TRACE_OS, ("yaffs_readpage_nolock done\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
 	return ret;
 }
 
@@ -805,9 +884,9 @@ static int yaffs_readpage(struct file *f, struct page *pg)
 {
 	int ret;
 
-	T(YAFFS_TRACE_OS, ("yaffs_readpage\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
 	ret=yaffs_readpage_unlock(f, pg);
-	T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
 	return ret;
 }
 
@@ -844,11 +923,11 @@ static int yaffs_writepage(struct page *page)
 
 		if (page->index > end_index || !nBytes) {
 			T(YAFFS_TRACE_OS,
-				("yaffs_writepage at %08x, inode size = %08x!!!\n",
+				(TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
 				(unsigned)(page->index << PAGE_CACHE_SHIFT),
 				(unsigned)inode->i_size));
 			T(YAFFS_TRACE_OS,
-				("                -> don't care!!\n"));
+				(TSTR("                -> don't care!!\n")));
 
 			zero_user_segment(page,0,PAGE_CACHE_SIZE);
 			set_page_writeback(page);
@@ -869,17 +948,17 @@ static int yaffs_writepage(struct page *page)
 	yaffs_GrossLock(obj->myDev);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_writepage at %08x, size %08x\n",
+		(TSTR("yaffs_writepage at %08x, size %08x\n"),
 		(unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
 	T(YAFFS_TRACE_OS,
-		("writepag0: obj = %05x, ino = %05x\n",
+		(TSTR("writepag0: obj = %05x, ino = %05x\n"),
 		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 
 	nWritten = yaffs_WriteDataToFile(obj, buffer,
 			page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 
 	T(YAFFS_TRACE_OS,
-		("writepag1: obj = %05x, ino = %05x\n",
+		(TSTR("writepag1: obj = %05x, ino = %05x\n"),
 		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 
 	yaffs_GrossUnlock(obj->myDev);
@@ -917,7 +996,9 @@ static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 		ret =  -ENOMEM;
 		goto out;
 	}
-	T(YAFFS_TRACE_OS, ("start yaffs_write_begin index %d(%x) uptodate %d\n",(int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
+	T(YAFFS_TRACE_OS,
+		(TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
+		(int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
 
 	/* Get fs space */
 	space_held = yaffs_hold_space(filp);
@@ -936,12 +1017,13 @@ static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
 		goto out;
 
 	/* Happy path return */
-	T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
+	T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
 
 	return 0;
 
 out:
-	T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
+	T(YAFFS_TRACE_OS,
+		(TSTR("end yaffs_write_begin fail returning %d\n"), ret));
 	if (space_held)
 		yaffs_release_space(filp);
 	if (pg) {
@@ -956,7 +1038,7 @@ out:
 static int yaffs_prepare_write(struct file *f, struct page *pg,
 				unsigned offset, unsigned to)
 {
-	T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
 
 	if (!Page_Uptodate(pg))
 		return yaffs_readpage_nolock(f, pg);
@@ -977,15 +1059,14 @@ static int yaffs_write_end(struct file *filp, struct address_space *mapping,
 	addr = kva + offset_into_page;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_write_end addr %x pos %x nBytes %d\n",
-		(unsigned) addr,
-		(int)pos, copied));
+		("yaffs_write_end addr %p pos %x nBytes %d\n",
+		addr,(unsigned)pos, copied));
 
 	ret = yaffs_file_write(filp, addr, copied, &pos);
 
 	if (ret != copied) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_write_end not same size ret %d  copied %d\n",
+			(TSTR("yaffs_write_end not same size ret %d  copied %d\n"),
 			ret, copied));
 		SetPageError(pg);
 	} else {
@@ -1019,14 +1100,14 @@ static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 	saddr = (unsigned) addr;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_commit_write addr %x pos %x nBytes %d\n",
+		(TSTR("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(YAFFS_TRACE_OS,
-			("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
+			(TSTR("yaffs_commit_write not same size nWritten %d  nBytes %d\n"),
 			nWritten, nBytes));
 		SetPageError(pg);
 	} else {
@@ -1036,7 +1117,7 @@ static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 	kunmap(pg);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_commit_write returning %d\n",
+		(TSTR("yaffs_commit_write returning %d\n"),
 		nWritten == nBytes ? 0 : nWritten));
 
 	return nWritten == nBytes ? 0 : nWritten;
@@ -1111,7 +1192,7 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 		inode->i_nlink = yaffs_GetObjectLinkCount(obj);
 
 		T(YAFFS_TRACE_OS,
-			("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
+			(TSTR("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)));
 
@@ -1146,7 +1227,7 @@ static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
 
 	} else {
 		T(YAFFS_TRACE_OS,
-			("yaffs_FileInode invalid parameters\n"));
+			(TSTR("yaffs_FileInode invalid parameters\n")));
 	}
 
 }
@@ -1158,20 +1239,20 @@ struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 
 	if (!sb) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_get_inode for NULL super_block!!\n"));
+			(TSTR("yaffs_get_inode for NULL super_block!!\n")));
 		return NULL;
 
 	}
 
 	if (!obj) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_get_inode for NULL object!!\n"));
+			(TSTR("yaffs_get_inode for NULL object!!\n")));
 		return NULL;
 
 	}
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_get_inode for object %d\n", obj->objectId));
+		(TSTR("yaffs_get_inode for object %d\n"), obj->objectId));
 
 	inode = Y_IGET(sb, obj->objectId);
 	if (IS_ERR(inode))
@@ -1207,17 +1288,17 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 
 	if (!obj)
 		T(YAFFS_TRACE_OS,
-			("yaffs_file_write: hey obj is null!\n"));
+			(TSTR("yaffs_file_write: hey obj is null!\n")));
 	else
 		T(YAFFS_TRACE_OS,
-			("yaffs_file_write about to write writing %u(%x) bytes"
-			"to object %d at %d(%x)\n",
+			(TSTR("yaffs_file_write about to write writing %u(%x) bytes"
+			"to object %d at %d(%x)\n"),
 			(unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
 
 	nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_file_write: %d(%x) bytes written\n",
+		(TSTR("yaffs_file_write: %d(%x) bytes written\n"),
 		(unsigned )n,(unsigned)n));
 
 	if (nWritten > 0) {
@@ -1228,8 +1309,8 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 			inode->i_blocks = (ipos + 511) >> 9;
 
 			T(YAFFS_TRACE_OS,
-				("yaffs_file_write size updated to %d bytes, "
-				"%d blocks\n",
+				(TSTR("yaffs_file_write size updated to %d bytes, "
+				"%d blocks\n"),
 				ipos, (int)(inode->i_blocks)));
 		}
 
@@ -1279,6 +1360,33 @@ static void yaffs_release_space(struct file *f)
 	yaffs_GrossUnlock(dev);
 }
 
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+	long long retval;
+
+	lock_kernel();
+
+	switch (origin){
+	case 2:
+		offset += i_size_read(file->f_path.dentry->d_inode);
+		break;
+	case 1:
+		offset += file->f_pos;
+	}
+	retval = -EINVAL;
+
+	if (offset >= 0){
+		if (offset != file->f_pos)
+			file->f_pos = offset;
+
+		retval = offset;
+	}
+	unlock_kernel();
+	return retval;
+}
+
+
 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 {
 	yaffs_Object *obj;
@@ -1296,6 +1404,8 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 
 	yaffs_GrossLock(dev);
 
+	yaffs_DeviceToContext(dev)->readdirProcess = current;
+
 	offset = f->f_pos;
 
         sc = yaffs_NewSearch(obj);
@@ -1304,11 +1414,11 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
                 goto unlock_out;
         }
 
-	T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
 
 	if (offset == 0) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_readdir: entry . ino %d \n",
+			(TSTR("yaffs_readdir: entry . ino %d \n"),
 			(int)inode->i_ino));
 		yaffs_GrossUnlock(dev);
 		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
@@ -1319,7 +1429,7 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 	}
 	if (offset == 1) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_readdir: entry .. ino %d \n",
+			(TSTR("yaffs_readdir: entry .. ino %d \n"),
 			(int)f->f_dentry->d_parent->d_inode->i_ino));
 		yaffs_GrossUnlock(dev);
 		if (filldir(dirent, "..", 2, offset,
@@ -1334,7 +1444,6 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 
 	/* If the directory has changed since the open or last call to
 	   readdir, rewind to after the 2 canned entries. */
-
 	if (f->f_version != inode->i_version) {
 		offset = 2;
 		f->f_pos = offset;
@@ -1351,8 +1460,8 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 			yaffs_GetObjectName(l, name,
 					    YAFFS_MAX_NAME_LENGTH + 1);
 			T(YAFFS_TRACE_OS,
-			  ("yaffs_readdir: %s inode %d\n", name,
-			   yaffs_GetObjectInode(l)));
+			  (TSTR("yaffs_readdir: %s inode %d\n"),
+			  name, yaffs_GetObjectInode(l)));
 
                         yaffs_GrossUnlock(dev);
 
@@ -1373,6 +1482,8 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 	}
 
 unlock_out:
+	yaffs_DeviceToContext(dev)->readdirProcess = NULL;
+
 	yaffs_GrossUnlock(dev);
 out:
         yaffs_EndSearch(sc);
@@ -1380,6 +1491,8 @@ out:
 	return retVal;
 }
 
+
+
 /*
  * File creation. Allocate an inode, and we're done..
  */
@@ -1414,16 +1527,16 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 
 	if (parent) {
 		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: parent object %d type %d\n",
+			(TSTR("yaffs_mknod: parent object %d type %d\n"),
 			parent->objectId, parent->variantType));
 	} else {
 		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: could not get parent object\n"));
+			(TSTR("yaffs_mknod: could not get parent object\n")));
 		return -EPERM;
 	}
 
-	T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
-			"mode %x dev %x\n",
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
+			"mode %x dev %x\n"),
 			dentry->d_name.name, mode, rdev));
 
 	dev = parent->myDev;
@@ -1433,7 +1546,7 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 	switch (mode & S_IFMT) {
 	default:
 		/* Special (socket, fifo, device...) */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 		obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
 				gid, old_encode_dev(rdev));
@@ -1443,18 +1556,18 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 #endif
 		break;
 	case S_IFREG:		/* file          */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
 		obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
 				gid);
 		break;
 	case S_IFDIR:		/* directory */
 		T(YAFFS_TRACE_OS,
-			("yaffs_mknod: making directory\n"));
+			(TSTR("yaffs_mknod: making directory\n")));
 		obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
 					uid, gid);
 		break;
 	case S_IFLNK:		/* symlink */
-		T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
+		T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
 		obj = NULL;	/* Do we ever get here? */
 		break;
 	}
@@ -1467,12 +1580,13 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 		d_instantiate(dentry, inode);
 		update_dir_time(dir);
 		T(YAFFS_TRACE_OS,
-			("yaffs_mknod created object %d count = %d\n",
+			(TSTR("yaffs_mknod created object %d count = %d\n"),
 			obj->objectId, atomic_read(&inode->i_count)));
 		error = 0;
+		yaffs_FillInodeFromObject(dir,parent);
 	} else {
 		T(YAFFS_TRACE_OS,
-			("yaffs_mknod failed making object\n"));
+			(TSTR("yaffs_mknod failed making object\n")));
 		error = -ENOMEM;
 	}
 
@@ -1482,7 +1596,7 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
 	int retVal;
-	T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
 	retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
 	return retVal;
 }
@@ -1494,7 +1608,7 @@ static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
 #endif
 {
-	T(YAFFS_TRACE_OS, ("yaffs_create\n"));
+	T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
 	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
 }
 
@@ -1503,16 +1617,18 @@ static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
 	int retVal;
 
 	yaffs_Device *dev;
+	yaffs_Object *obj;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
+		(TSTR("yaffs_unlink %d:%s\n"),
+		(int)(dir->i_ino),
 		dentry->d_name.name));
-
-	dev = yaffs_InodeToObject(dir)->myDev;
+	obj = yaffs_InodeToObject(dir);
+	dev = obj->myDev;
 
 	yaffs_GrossLock(dev);
 
-	retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
+	retVal = yaffs_Unlink(obj, dentry->d_name.name);
 
 	if (retVal == YAFFS_OK) {
 		dentry->d_inode->i_nlink--;
@@ -1537,7 +1653,7 @@ static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 	yaffs_Object *link = NULL;
 	yaffs_Device *dev;
 
-	T(YAFFS_TRACE_OS, ("yaffs_link\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
 
 	obj = yaffs_InodeToObject(inode);
 	dev = obj->myDev;
@@ -1553,7 +1669,7 @@ static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
 		d_instantiate(dentry, old_dentry->d_inode);
 		atomic_inc(&old_dentry->d_inode->i_count);
 		T(YAFFS_TRACE_OS,
-			("yaffs_link link count %d i_count %d\n",
+			(TSTR("yaffs_link link count %d i_count %d\n"),
 			old_dentry->d_inode->i_nlink,
 			atomic_read(&old_dentry->d_inode->i_count)));
 	}
@@ -1576,7 +1692,7 @@ static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 	uid_t uid = YCRED(current)->fsuid;
 	gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
 
-	T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
 
 	dev = yaffs_InodeToObject(dir)->myDev;
 	yaffs_GrossLock(dev);
@@ -1590,10 +1706,10 @@ static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
 		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
 		d_instantiate(dentry, inode);
 		update_dir_time(dir);
-		T(YAFFS_TRACE_OS, ("symlink created OK\n"));
+		T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
 		return 0;
 	} else {
-		T(YAFFS_TRACE_OS, ("symlink not created\n"));
+		T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
 	}
 
 	return -ENOMEM;
@@ -1610,7 +1726,8 @@ static int yaffs_sync_object(struct file *file, struct dentry *dentry,
 
 	dev = obj->myDev;
 
-	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_object\n"));
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		(TSTR("yaffs_sync_object\n")));
 	yaffs_GrossLock(dev);
 	yaffs_FlushFile(obj, 1, datasync);
 	yaffs_GrossUnlock(dev);
@@ -1629,7 +1746,7 @@ static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	int retVal = YAFFS_FAIL;
 	yaffs_Object *target;
 
-	T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
 	dev = yaffs_InodeToObject(old_dir)->myDev;
 
 	yaffs_GrossLock(dev);
@@ -1643,12 +1760,12 @@ static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
 		!ylist_empty(&target->variant.directoryVariant.children)) {
 
-		T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
+		T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
 
 		retVal = YAFFS_FAIL;
 	} else {
 		/* Now does unlinking internally using shadowing mechanism */
-		T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
+		T(YAFFS_TRACE_OS, (TSTR("calling yaffs_RenameObject\n")));
 
 		retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
 				old_dentry->d_name.name,
@@ -1679,7 +1796,7 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 	yaffs_Device *dev;
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_setattr of object %d\n",
+		(TSTR("yaffs_setattr of object %d\n"),
 		yaffs_InodeToObject(inode)->objectId));
 
 	/* Fail if a requested resize >= 2GB */		
@@ -1693,13 +1810,14 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 		int result;
 		if (!error){
 			error = inode_setattr(inode, attr);
-			T(YAFFS_TRACE_OS,("inode_setattr called\n"));
+			T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
 			if (attr->ia_valid & ATTR_SIZE)
                         	truncate_inode_pages(&inode->i_data,attr->ia_size);
 		}
 		dev = yaffs_InodeToObject(inode)->myDev;
 		if (attr->ia_valid & ATTR_SIZE){
-			T(YAFFS_TRACE_OS,("resize to %d(%x)\n",(int)(attr->ia_size),(int)(attr->ia_size)));
+			T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
+				(int)(attr->ia_size),(int)(attr->ia_size)));
 		}
 		yaffs_GrossLock(dev);
 		result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
@@ -1713,7 +1831,7 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 	}
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_setattr done returning %d\n",error));
+		(TSTR("yaffs_setattr done returning %d\n"),error));
 
 	return error;
 }
@@ -1733,7 +1851,7 @@ static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
 #endif
 
-	T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
 
 	yaffs_GrossLock(dev);
 
@@ -1798,7 +1916,8 @@ static void yaffs_FlushInodes(struct super_block *sb)
 	list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
 		obj = yaffs_InodeToObject(iptr);
 		if(obj){
-			T(YAFFS_TRACE_OS, ("flushing obj %d\n",obj->objectId));
+			T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
+				obj->objectId));
 			yaffs_FlushFile(obj,1,0);
 		}
 	}
@@ -1818,22 +1937,57 @@ static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
 		yaffs_CheckpointSave(dev);
 }
 
-static int yaffs_do_sync_fs(struct super_block *sb, int do_checkpoint)
+
+static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
+{
+	unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+	unsigned scatteredFree = 0; /* Free chunks not in an erased block */
+
+	if(erasedChunks < dev->nFreeChunks)
+		scatteredFree = (dev->nFreeChunks - erasedChunks);
+
+	if(!context->bgRunning)
+		return 0;
+	else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
+		return 0;
+	else if(erasedChunks > dev->nFreeChunks/2)
+		return 0;
+	else if(erasedChunks > dev->nFreeChunks/4)
+		return 1;
+	else
+		return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb,
+				int request_checkpoint)
 {
 
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
-	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, 
-		("yaffs_do_sync_fs: %s %s\n", 
+	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+	unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+	int do_checkpoint;
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
+		gc_urgent,
 		sb->s_dirt ? "dirty" : "clean",
-		do_checkpoint ? "with checkpoint" : "no checkpoint"));
+		request_checkpoint ? "checkpoint requested" : "no checkpoint",
+		oneshot_checkpoint ? " one-shot" : "" ));
 
-	if (sb->s_dirt) {
-		yaffs_GrossLock(dev);
-		yaffs_FlushSuperBlock(sb,do_checkpoint);
-		yaffs_GrossUnlock(dev);
+	yaffs_GrossLock(dev);
+	do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+			oneshot_checkpoint) &&
+			!dev->isCheckpointed;
 
+	if (sb->s_dirt || do_checkpoint) {
+		yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
 		sb->s_dirt = 0;
+		if(oneshot_checkpoint)
+			yaffs_auto_checkpoint &= ~4;
 	}
+	yaffs_GrossUnlock(dev);
+
 	return 0;
 }
 
@@ -1850,38 +2004,100 @@ static int yaffs_do_sync_fs(struct super_block *sb, int do_checkpoint)
  */
 
 #ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+	wake_up_process((struct task_struct *)data);
+}
+
 static int yaffs_BackgroundThread(void *data)
 {
 	yaffs_Device *dev = (yaffs_Device *)data;
 	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+	unsigned long now = jiffies;
+	unsigned long next_dir_update = now;
+	unsigned long next_gc = now;
+	unsigned long expires;
+	unsigned int urgency;
+
+	int gcResult;
+	struct timer_list timer;
 
 	T(YAFFS_TRACE_BACKGROUND,
-		("yaffs_background starting for dev %p\n",
+		(TSTR("yaffs_background starting for dev %p\n"),
 		(void *)dev));
-	
+
+	set_freezable();
+
 	while(context->bgRunning){
 		T(YAFFS_TRACE_BACKGROUND,
-			("yaffs_background\n"));
+			(TSTR("yaffs_background\n")));
 
 		if(kthread_should_stop())
 			break;
+
+		if(try_to_freeze())
+			continue;
+
 		yaffs_GrossLock(dev);
-		yaffs_UpdateDirtyDirectories(dev);
+
+		now = jiffies;
+
+		if(time_after(now, next_dir_update)){
+			yaffs_UpdateDirtyDirectories(dev);
+			next_dir_update = now + HZ;
+		}
+
+		if(time_after(now,next_gc)){
+			if(!dev->isCheckpointed){
+				urgency = yaffs_bg_gc_urgency(dev);
+				gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
+				if(urgency > 1)
+					next_gc = now + HZ/20+1;
+				else if(urgency > 0)
+					next_gc = now + HZ/10+1;
+				else
+					next_gc = now + HZ * 2;
+			} else /*
+				* gc not running so set to next_dir_update
+				* to cut down on wake ups
+				*/
+				next_gc = next_dir_update;
+		}
 		yaffs_GrossUnlock(dev);
-		msleep(500);
+#if 1
+		expires = next_dir_update;
+		if (time_before(next_gc,expires))
+			expires = next_gc;
+		if(time_before(expires,now))
+			expires = now + HZ;
+
+		init_timer(&timer);
+		timer.expires = expires+1;
+		timer.data = (unsigned long) current;
+		timer.function = yaffs_background_waker;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+		add_timer(&timer);
+		schedule();
+		del_timer_sync(&timer);
+#else
+		msleep(10);
+#endif
 	}
+
 	return 0;
 }
 
 static int yaffs_BackgroundStart(yaffs_Device *dev)
 {
 	int retval = 0;
-
 	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
 
 	context->bgRunning = 1;
 
-	context->bgThread = kthread_run(yaffs_BackgroundThread,(void *)dev,"yaffs_%x",(unsigned)dev);
+	context->bgThread = kthread_run(yaffs_BackgroundThread,
+	                        (void *)dev,"yaffs-bg");
 
 	if(IS_ERR(context->bgThread)){
 		retval = PTR_ERR(context->bgThread);
@@ -1925,9 +2141,13 @@ static void yaffs_write_super(struct super_block *sb)
 static int yaffs_write_super(struct super_block *sb)
 #endif
 {
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs_write_super%s\n"),
+		request_checkpoint ? " checkpt" : ""));
 
-	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_write_super\n"));
-	yaffs_do_sync_fs(sb, yaffs_auto_checkpoint >= 2);
+	yaffs_do_sync_fs(sb, request_checkpoint);
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
 	return 0;
@@ -1941,9 +2161,13 @@ static int yaffs_sync_fs(struct super_block *sb, int wait)
 static int yaffs_sync_fs(struct super_block *sb)
 #endif
 {
-	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ("yaffs_sync_fs\n"));
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
 
-	yaffs_do_sync_fs(sb,yaffs_auto_checkpoint >= 1);
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		(TSTR("yaffs_sync_fs%s\n"),
+		request_checkpoint ? " checkpt" : ""));
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
 
 	return 0;
 }
@@ -1957,7 +2181,7 @@ static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_iget for %lu\n", ino));
+		(TSTR("yaffs_iget for %lu\n"), ino));
 
 	inode = iget_locked(sb, ino);
 	if (!inode)
@@ -1995,15 +2219,17 @@ static void yaffs_read_inode(struct inode *inode)
 	yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
 
 	T(YAFFS_TRACE_OS,
-		("yaffs_read_inode for %d\n", (int)inode->i_ino));
+		(TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
 
-	yaffs_GrossLock(dev);
+	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+		yaffs_GrossLock(dev);
 
 	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
 
 	yaffs_FillInodeFromObject(inode, obj);
 
-	yaffs_GrossUnlock(dev);
+	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+		yaffs_GrossUnlock(dev);
 }
 
 #endif
@@ -2020,7 +2246,7 @@ static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
 		struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
 
 		T(YAFFS_TRACE_OS,
-			("yaffs_remount_fs: %s: RO\n", dev->name));
+			(TSTR("yaffs_remount_fs: %s: RO\n"), dev->name));
 
 		yaffs_GrossLock(dev);
 
@@ -2032,7 +2258,7 @@ static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
 		yaffs_GrossUnlock(dev);
 	} else {
 		T(YAFFS_TRACE_OS,
-			("yaffs_remount_fs: %s: RW\n", dev->name));
+			(TSTR("yaffs_remount_fs: %s: RW\n"), dev->name));
 	}
 
 	return 0;
@@ -2043,7 +2269,13 @@ static void yaffs_put_super(struct super_block *sb)
 {
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
 
-	T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
+
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		(TSTR("Shutting down yaffs background thread\n")));
+	yaffs_BackgroundStop(dev);
+	T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		(TSTR("yaffs background thread shut down\n")));
 
 	yaffs_GrossLock(dev);
 
@@ -2052,7 +2284,6 @@ static void yaffs_put_super(struct super_block *sb)
 	if (yaffs_DeviceToContext(dev)->putSuperFunc)
 		yaffs_DeviceToContext(dev)->putSuperFunc(sb);
 
-	yaffs_BackgroundStop(dev);
 
 	yaffs_Deinitialise(dev);
 
@@ -2086,7 +2317,7 @@ static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
 {
 	struct super_block *sb = yaffs_DeviceToContext(dev)->superBlock;
 
-	T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_MarkSuperBlockDirty() sb = %p\n"), sb));
 	if (sb)
 		sb->s_dirt = 1;
 }
@@ -2188,6 +2419,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	sb->s_op = &yaffs_super_ops;
 	sb->s_flags |= MS_NOATIME;
 
+#ifdef YAFFS_COMPILE_EXPORTFS
+	sb->s_export_op = &yaffs_export_ops;
+#endif
+
 	if (!sb)
 		printk(KERN_INFO "yaffs: sb is NULL\n");
 	else if (!sb->s_dev)
@@ -2214,20 +2449,17 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 
 	sb->s_blocksize = PAGE_CACHE_SIZE;
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
-	T(YAFFS_TRACE_OS,
-	  ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
 
-#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
 	T(YAFFS_TRACE_OS,
-	  ("yaffs: Write verification disabled. All guarantees "
-	   "null and void\n"));
-#endif
+		(TSTR("yaffs_read_super: Using yaffs%d\n"), yaffsVersion));
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_read_super: block size %d\n"),
+		(int)(sb->s_blocksize)));
 
-	T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
-			       "\"%s\"\n",
-			       MAJOR(sb->s_dev), MINOR(sb->s_dev),
-			       yaffs_devname(sb, devname_buf)));
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
+	       MAJOR(sb->s_dev), MINOR(sb->s_dev),
+	       yaffs_devname(sb, devname_buf)));
 
 	/* Check it's an mtd device..... */
 	if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
@@ -2237,43 +2469,46 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
 	if (!mtd) {
 		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs: MTD device #%u doesn't appear to exist\n",
-		   MINOR(sb->s_dev)));
+			(TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
+			MINOR(sb->s_dev)));
 		return NULL;
 	}
 	/* Check it's NAND */
 	if (mtd->type != MTD_NANDFLASH) {
 		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
+			(TSTR("yaffs: MTD device is not NAND it's type %d\n"),
+			mtd->type));
 		return NULL;
 	}
 
-	T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
-	T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
-	T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
-	T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
-	T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
-	T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
-	T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
-	T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
-	T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
-	T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
+	T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
+	T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
+	T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
+	T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
+	T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
+	T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
+	T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
+	T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
+	T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
+	T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-	T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
+	T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
 #else
-	T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
+	T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
 #endif
 
 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
 
 	if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
-		T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: auto selecting yaffs2\n")));
 		yaffsVersion = 2;
 	}
 
 	/* Added NCB 26/5/2006 for completeness */
 	if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
-		T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("yaffs: auto selecting yaffs1\n")));
 		yaffsVersion = 1;
 	}
 
@@ -2293,8 +2528,8 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
 #endif
 			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support required "
-			   "functions\n"));;
+			  (TSTR("yaffs: MTD device does not support required "
+			   "functions\n")));
 			return NULL;
 		}
 
@@ -2302,8 +2537,8 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 		    mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
 		    !options.inband_tags) {
 			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not have the "
-			   "right page sizes\n"));
+			  (TSTR("yaffs: MTD device does not have the "
+			   "right page sizes\n")));
 			return NULL;
 		}
 	} else {
@@ -2318,16 +2553,16 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 		    !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
 #endif
 			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support required "
-			   "functions\n"));;
+			  (TSTR("yaffs: MTD device does not support required "
+			   "functions\n")));
 			return NULL;
 		}
 
 		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
 		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
 			T(YAFFS_TRACE_ALWAYS,
-			  ("yaffs: MTD device does not support have the "
-			   "right page sizes\n"));
+			  (TSTR("yaffs: MTD device does not support have the "
+			   "right page sizes\n")));
 			return NULL;
 		}
 	}
@@ -2352,8 +2587,8 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	if (!dev) {
 		/* Deep shit could not allocate device structure */
 		T(YAFFS_TRACE_ALWAYS,
-		  ("yaffs_read_super: Failed trying to allocate "
-		   "yaffs_Device. \n"));
+		  (TSTR("yaffs_read_super: Failed trying to allocate "
+		   "yaffs_Device. \n")));
 		return NULL;
 	}
 	memset(dev, 0, sizeof(yaffs_Device));
@@ -2413,7 +2648,7 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
 	param->refreshPeriod = 0;
 #else
-	param->refreshPeriod = 10000;
+	param->refreshPeriod = 500;
 #endif
 
 	if(options.empty_lost_and_found_overridden)
@@ -2462,6 +2697,7 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	yaffs_DeviceToContext(dev)->putSuperFunc = yaffs_MTDPutSuper;
 
 	param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
+	param->gcControl = yaffs_gc_control_callback;
 
 	yaffs_DeviceToContext(dev)->superBlock= sb;
 	
@@ -2493,7 +2729,7 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	err = yaffs_GutsInitialise(dev);
 
 	T(YAFFS_TRACE_OS,
-	  ("yaffs_read_super: guts initialised %s\n",
+	  (TSTR("yaffs_read_super: guts initialised %s\n"),
 	   (err == YAFFS_OK) ? "OK" : "FAILED"));
 	   
 	if(err == YAFFS_OK)
@@ -2517,11 +2753,11 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	inode->i_op = &yaffs_dir_inode_operations;
 	inode->i_fop = &yaffs_dir_operations;
 
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
 
 	root = d_alloc_root(inode);
 
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
 
 	if (!root) {
 		iput(inode);
@@ -2530,9 +2766,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	sb->s_root = root;
 	sb->s_dirt = !dev->isCheckpointed;
 	T(YAFFS_TRACE_ALWAYS,
-	  ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
+		(TSTR("yaffs_read_super: isCheckpointed %d\n"),
+		dev->isCheckpointed));
 
-	T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
+	T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
 	return sb;
 }
 
@@ -2673,8 +2910,10 @@ static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
 	buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
 	buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
 	buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
-	buf += sprintf(buf, "garbageCollections. %u\n", dev->garbageCollections);
-	buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGarbageCollections);
+	buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
+	buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
+	buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+	buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
 	buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
 	buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
 	buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
@@ -2710,9 +2949,7 @@ static int yaffs_proc_read(char *page,
 
 	/* Print header first */
 	if (step == 0)
-		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
-			       "\n%s\n%s\n", yaffs_fs_c_version,
-			       yaffs_guts_c_version);
+		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__"\n");
 	else if (step == 1)
 		buf += sprintf(buf,"\n");
 	else {
@@ -2743,13 +2980,12 @@ static int yaffs_proc_read(char *page,
 	return buf - page < count ? buf - page : count;
 }
 
-static int yaffs_debug_proc_read(char *page,
+static int yaffs_stats_proc_read(char *page,
 				char **start,
 				off_t offset, int count, int *eof, void *data)
 {
 	struct ylist_head *item;
 	char *buf = page;
-	int step = offset;
 	int n = 0;
 
 	down(&yaffs_context_lock);
@@ -2768,8 +3004,9 @@ static int yaffs_debug_proc_read(char *page,
 		nTnodes = dev->nTnodesCreated - dev->nFreeTnodes;
 		
 		
-		buf += sprintf(buf,"%d, %d, %d, %d, %d\n", 
+		buf += sprintf(buf,"%d, %d, %d, %u, %u, %d, %d\n",
 				n, dev->nFreeChunks, erasedChunks,
+				dev->backgroundGCs, dev->oldestDirtyGCs,
 				nObjects, nTnodes);
 	}
 	up(&yaffs_context_lock);
@@ -2790,6 +3027,7 @@ static struct {
 } mask_flags[] = {
 	{"allocate", YAFFS_TRACE_ALLOCATE},
 	{"always", YAFFS_TRACE_ALWAYS},
+	{"background", YAFFS_TRACE_BACKGROUND},
 	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
 	{"buffers", YAFFS_TRACE_BUFFERS},
 	{"bug", YAFFS_TRACE_BUG},
@@ -2799,6 +3037,7 @@ static struct {
 	{"error", YAFFS_TRACE_ERROR},
 	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
 	{"gc", YAFFS_TRACE_GC},
+	{"lock", YAFFS_TRACE_LOCK},
 	{"mtd", YAFFS_TRACE_MTD},
 	{"nandaccess", YAFFS_TRACE_NANDACCESS},
 	{"os", YAFFS_TRACE_OS},
@@ -2806,15 +3045,13 @@ static struct {
 	{"scan", YAFFS_TRACE_SCAN},
 	{"tracing", YAFFS_TRACE_TRACING},
 	{"sync", YAFFS_TRACE_SYNC},
-
-	{"background", YAFFS_TRACE_BACKGROUND},
+	{"write", YAFFS_TRACE_WRITE},
 
 	{"verify", YAFFS_TRACE_VERIFY},
 	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
 	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
 	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
 
-	{"write", YAFFS_TRACE_WRITE},
 	{"all", 0xffffffff},
 	{"none", 0},
 	{NULL, 0},
@@ -2905,7 +3142,8 @@ static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
 	if (rg & YAFFS_TRACE_ALWAYS) {
 		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
 			char flag;
-			flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
+			flag = ((rg & mask_flags[i].mask_bitfield) ==
+				mask_flags[i].mask_bitfield) ? '+' : '-';
 			printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
 		}
 	}
@@ -2938,7 +3176,15 @@ static int __init init_yaffs_fs(void)
 	struct file_system_to_install *fsinst;
 
 	T(YAFFS_TRACE_ALWAYS,
-	  ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
+	  (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
+#endif
+
+
+
 
 	init_MUTEX(&yaffs_context_lock);
 
@@ -2954,13 +3200,13 @@ static int __init init_yaffs_fs(void)
 	} else
 		return -ENOMEM;
 
-	debug_proc_entry = create_proc_entry("yaffs_debug",
+	debug_proc_entry = create_proc_entry("yaffs_stats",
 					       S_IRUGO | S_IFREG,
 					       YPROC_ROOT);
 
 	if (debug_proc_entry) {
 		debug_proc_entry->write_proc = NULL;
-		debug_proc_entry->read_proc = yaffs_debug_proc_read;
+		debug_proc_entry->read_proc = yaffs_stats_proc_read;
 		debug_proc_entry->data = NULL;
 	} else
 		return -ENOMEM;
@@ -2997,10 +3243,11 @@ static void __exit exit_yaffs_fs(void)
 
 	struct file_system_to_install *fsinst;
 
-	T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
-			       " removing. \n"));
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
 
 	remove_proc_entry("yaffs", YPROC_ROOT);
+	remove_proc_entry("yaffs_stats", YPROC_ROOT);
 
 	fsinst = fs_to_install;
 
@@ -3017,5 +3264,5 @@ module_init(init_yaffs_fs)
 module_exit(exit_yaffs_fs)
 
 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
-MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
 MODULE_LICENSE("GPL");