2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2009 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 yaffs_Device associated with
29 * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
31 * >> inode->u.generic_ip points to the associated yaffs_Object.
34 const char *yaffs_fs_c_version =
35 "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $";
36 extern const char *yaffs_guts_c_version;
38 #include <linux/version.h>
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
40 #include <linux/config.h>
42 #include <linux/kernel.h>
43 #include <linux/module.h>
44 #include <linux/slab.h>
45 #include <linux/init.h>
47 #include <linux/proc_fs.h>
48 #include <linux/smp_lock.h>
49 #include <linux/pagemap.h>
50 #include <linux/mtd/mtd.h>
51 #include <linux/interrupt.h>
52 #include <linux/string.h>
53 #include <linux/ctype.h>
55 #include "asm/div64.h"
57 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
59 #include <linux/statfs.h> /* Added NCB 15-8-2003 */
60 #include <linux/statfs.h>
61 #define UnlockPage(p) unlock_page(p)
62 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
64 /* FIXME: use sb->s_id instead ? */
65 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
69 #include <linux/locks.h>
70 #define BDEVNAME_SIZE 0
71 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
73 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
74 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
80 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
81 #define YPROC_ROOT (&proc_root)
83 #define YPROC_ROOT NULL
86 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
87 #define WRITE_SIZE_STR "writesize"
88 #define WRITE_SIZE(mtd) ((mtd)->writesize)
90 #define WRITE_SIZE_STR "oobblock"
91 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
94 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
95 #define YAFFS_USE_WRITE_BEGIN_END 1
97 #define YAFFS_USE_WRITE_BEGIN_END 0
100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
101 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
103 uint64_t result = partition_size;
104 do_div(result, block_size);
105 return (uint32_t)result;
108 #define YCALCBLOCKS(s, b) ((s)/(b))
111 #include <linux/uaccess.h>
113 #include "yportenv.h"
114 #include "yaffs_guts.h"
116 #include <linux/mtd/mtd.h>
117 #include "yaffs_mtdif.h"
118 #include "yaffs_mtdif1.h"
119 #include "yaffs_mtdif2.h"
121 unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
122 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
123 unsigned int yaffs_auto_checkpoint = 1;
125 /* Module Parameters */
126 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
127 module_param(yaffs_traceMask, uint, 0644);
128 module_param(yaffs_wr_attempts, uint, 0644);
129 module_param(yaffs_auto_checkpoint, uint, 0644);
131 MODULE_PARM(yaffs_traceMask, "i");
132 MODULE_PARM(yaffs_wr_attempts, "i");
133 MODULE_PARM(yaffs_auto_checkpoint, "i");
136 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
137 /* use iget and read_inode */
138 #define Y_IGET(sb, inum) iget((sb), (inum))
139 static void yaffs_read_inode(struct inode *inode);
142 /* Call local equivalent */
143 #define YAFFS_USE_OWN_IGET
144 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
146 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
149 /*#define T(x) printk x */
151 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
152 #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
154 #define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
157 #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
158 #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
160 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
161 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
163 #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
166 static void yaffs_put_super(struct super_block *sb);
168 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
170 static ssize_t yaffs_hold_space(struct file *f);
171 static void yaffs_release_space(struct file *f);
173 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
174 static int yaffs_file_flush(struct file *file, fl_owner_t id);
176 static int yaffs_file_flush(struct file *file);
179 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
182 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
184 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
185 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
186 struct nameidata *n);
187 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
188 struct nameidata *n);
190 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
191 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
193 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
194 struct dentry *dentry);
195 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
196 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
197 const char *symname);
198 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
200 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
201 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
204 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
207 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
208 struct inode *new_dir, struct dentry *new_dentry);
209 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
211 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
212 static int yaffs_sync_fs(struct super_block *sb, int wait);
213 static void yaffs_write_super(struct super_block *sb);
215 static int yaffs_sync_fs(struct super_block *sb);
216 static int yaffs_write_super(struct super_block *sb);
219 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
220 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
221 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
222 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
224 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
227 #ifdef YAFFS_HAS_PUT_INODE
228 static void yaffs_put_inode(struct inode *inode);
231 static void yaffs_delete_inode(struct inode *);
232 static void yaffs_clear_inode(struct inode *);
234 static int yaffs_readpage(struct file *file, struct page *page);
235 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
236 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
238 static int yaffs_writepage(struct page *page);
242 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
243 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
244 loff_t pos, unsigned len, unsigned flags,
245 struct page **pagep, void **fsdata);
246 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
247 loff_t pos, unsigned len, unsigned copied,
248 struct page *pg, void *fsdadata);
250 static int yaffs_prepare_write(struct file *f, struct page *pg,
251 unsigned offset, unsigned to);
252 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
257 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
259 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
260 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
262 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
265 static struct address_space_operations yaffs_file_address_operations = {
266 .readpage = yaffs_readpage,
267 .writepage = yaffs_writepage,
268 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
269 .write_begin = yaffs_write_begin,
270 .write_end = yaffs_write_end,
272 .prepare_write = yaffs_prepare_write,
273 .commit_write = yaffs_commit_write,
277 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
278 static const struct file_operations yaffs_file_operations = {
279 .read = do_sync_read,
280 .write = do_sync_write,
281 .aio_read = generic_file_aio_read,
282 .aio_write = generic_file_aio_write,
283 .mmap = generic_file_mmap,
284 .flush = yaffs_file_flush,
285 .fsync = yaffs_sync_object,
286 .splice_read = generic_file_splice_read,
287 .splice_write = generic_file_splice_write,
288 .llseek = generic_file_llseek,
291 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
293 static const struct file_operations yaffs_file_operations = {
294 .read = do_sync_read,
295 .write = do_sync_write,
296 .aio_read = generic_file_aio_read,
297 .aio_write = generic_file_aio_write,
298 .mmap = generic_file_mmap,
299 .flush = yaffs_file_flush,
300 .fsync = yaffs_sync_object,
301 .sendfile = generic_file_sendfile,
306 static const struct file_operations yaffs_file_operations = {
307 .read = generic_file_read,
308 .write = generic_file_write,
309 .mmap = generic_file_mmap,
310 .flush = yaffs_file_flush,
311 .fsync = yaffs_sync_object,
312 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
313 .sendfile = generic_file_sendfile,
318 static const struct inode_operations yaffs_file_inode_operations = {
319 .setattr = yaffs_setattr,
322 static const struct inode_operations yaffs_symlink_inode_operations = {
323 .readlink = yaffs_readlink,
324 .follow_link = yaffs_follow_link,
325 .setattr = yaffs_setattr,
328 static const struct inode_operations yaffs_dir_inode_operations = {
329 .create = yaffs_create,
330 .lookup = yaffs_lookup,
332 .unlink = yaffs_unlink,
333 .symlink = yaffs_symlink,
334 .mkdir = yaffs_mkdir,
335 .rmdir = yaffs_unlink,
336 .mknod = yaffs_mknod,
337 .rename = yaffs_rename,
338 .setattr = yaffs_setattr,
341 static const struct file_operations yaffs_dir_operations = {
342 .read = generic_read_dir,
343 .readdir = yaffs_readdir,
344 .fsync = yaffs_sync_object,
347 static const struct super_operations yaffs_super_ops = {
348 .statfs = yaffs_statfs,
350 #ifndef YAFFS_USE_OWN_IGET
351 .read_inode = yaffs_read_inode,
353 #ifdef YAFFS_HAS_PUT_INODE
354 .put_inode = yaffs_put_inode,
356 .put_super = yaffs_put_super,
357 .delete_inode = yaffs_delete_inode,
358 .clear_inode = yaffs_clear_inode,
359 .sync_fs = yaffs_sync_fs,
360 .write_super = yaffs_write_super,
363 static void yaffs_GrossLock(yaffs_Device *dev)
365 T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
366 down(&dev->grossLock);
367 T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
370 static void yaffs_GrossUnlock(yaffs_Device *dev)
372 T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
376 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
379 unsigned char *alias;
382 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
384 yaffs_GrossLock(dev);
386 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
388 yaffs_GrossUnlock(dev);
393 ret = vfs_readlink(dentry, buffer, buflen, alias);
398 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
399 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
401 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
404 unsigned char *alias;
406 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
408 yaffs_GrossLock(dev);
410 alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
412 yaffs_GrossUnlock(dev);
419 ret = vfs_follow_link(nd, alias);
422 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
429 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
433 * Lookup is used to find objects in the fs
435 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
437 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
440 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
444 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
446 yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
448 yaffs_GrossLock(dev);
451 ("yaffs_lookup for %d:%s\n",
452 yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
454 obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
455 dentry->d_name.name);
457 obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
459 /* Can't hold gross lock when calling yaffs_get_inode() */
460 yaffs_GrossUnlock(dev);
464 ("yaffs_lookup found %d\n", obj->objectId));
466 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
470 ("yaffs_loookup dentry \n"));
471 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
472 * d_add even if NULL inode */
474 /*dget(dentry); // try to solve directory bug */
475 d_add(dentry, inode);
483 T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
487 /* added NCB for 2.5/6 compatability - forces add even if inode is
488 * NULL which creates dentry hash */
489 d_add(dentry, inode);
495 #ifdef YAFFS_HAS_PUT_INODE
497 /* For now put inode is just for debugging
498 * Put inode is called when the inode **structure** is put.
500 static void yaffs_put_inode(struct inode *inode)
503 ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
504 atomic_read(&inode->i_count)));
509 /* clear is called to tell the fs to release any per-inode data it holds */
510 static void yaffs_clear_inode(struct inode *inode)
515 obj = yaffs_InodeToObject(inode);
518 ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
519 atomic_read(&inode->i_count),
520 obj ? "object exists" : "null object"));
524 yaffs_GrossLock(dev);
526 /* Clear the association between the inode and
530 yaffs_InodeToObjectLV(inode) = NULL;
532 /* If the object freeing was deferred, then the real
534 * This should fix the inode inconsistency problem.
537 yaffs_HandleDeferedFree(obj);
539 yaffs_GrossUnlock(dev);
544 /* delete is called when the link count is zero and the inode
545 * is put (ie. nobody wants to know about it anymore, time to
547 * NB Must call clear_inode()
549 static void yaffs_delete_inode(struct inode *inode)
551 yaffs_Object *obj = yaffs_InodeToObject(inode);
555 ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
556 atomic_read(&inode->i_count),
557 obj ? "object exists" : "null object"));
561 yaffs_GrossLock(dev);
562 yaffs_DeleteObject(obj);
563 yaffs_GrossUnlock(dev);
565 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
566 truncate_inode_pages(&inode->i_data, 0);
571 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
572 static int yaffs_file_flush(struct file *file, fl_owner_t id)
574 static int yaffs_file_flush(struct file *file)
577 yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
579 yaffs_Device *dev = obj->myDev;
582 ("yaffs_file_flush object %d (%s)\n", obj->objectId,
583 obj->dirty ? "dirty" : "clean"));
585 yaffs_GrossLock(dev);
587 yaffs_FlushFile(obj, 1);
589 yaffs_GrossUnlock(dev);
594 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
596 /* Lifted from jffs2 */
599 unsigned char *pg_buf;
604 T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
605 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
606 (unsigned)PAGE_CACHE_SIZE));
608 obj = yaffs_DentryToObject(f->f_dentry);
612 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
613 BUG_ON(!PageLocked(pg));
620 /* FIXME: Can kmap fail? */
622 yaffs_GrossLock(dev);
624 ret = yaffs_ReadDataFromFile(obj, pg_buf,
625 pg->index << PAGE_CACHE_SHIFT,
628 yaffs_GrossUnlock(dev);
634 ClearPageUptodate(pg);
641 flush_dcache_page(pg);
644 T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
648 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
650 int ret = yaffs_readpage_nolock(f, pg);
655 static int yaffs_readpage(struct file *f, struct page *pg)
657 return yaffs_readpage_unlock(f, pg);
660 /* writepage inspired by/stolen from smbfs */
662 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
663 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
665 static int yaffs_writepage(struct page *page)
668 struct address_space *mapping = page->mapping;
669 loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
671 unsigned long end_index;
679 inode = mapping->host;
683 if (offset > inode->i_size) {
685 ("yaffs_writepage at %08x, inode size = %08x!!!\n",
686 (unsigned)(page->index << PAGE_CACHE_SHIFT),
687 (unsigned)inode->i_size));
689 (" -> don't care!!\n"));
694 end_index = inode->i_size >> PAGE_CACHE_SHIFT;
697 if (page->index < end_index)
698 nBytes = PAGE_CACHE_SIZE;
700 nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
706 obj = yaffs_InodeToObject(inode);
707 yaffs_GrossLock(obj->myDev);
710 ("yaffs_writepage at %08x, size %08x\n",
711 (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
713 ("writepag0: obj = %05x, ino = %05x\n",
714 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
716 nWritten = yaffs_WriteDataToFile(obj, buffer,
717 page->index << PAGE_CACHE_SHIFT, nBytes, 0);
720 ("writepag1: obj = %05x, ino = %05x\n",
721 (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
723 yaffs_GrossUnlock(obj->myDev);
726 SetPageUptodate(page);
730 return (nWritten == nBytes) ? 0 : -ENOSPC;
734 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
735 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
736 loff_t pos, unsigned len, unsigned flags,
737 struct page **pagep, void **fsdata)
739 struct page *pg = NULL;
740 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
741 uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
742 uint32_t to = offset + len;
747 T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
749 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
750 pg = grab_cache_page_write_begin(mapping, index, flags);
752 pg = __grab_cache_page(mapping, index);
761 space_held = yaffs_hold_space(filp);
768 /* Update page if required */
770 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
771 ret = yaffs_readpage_nolock(filp, pg);
776 /* Happy path return */
777 T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
782 T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
784 yaffs_release_space(filp);
787 page_cache_release(pg);
794 static int yaffs_prepare_write(struct file *f, struct page *pg,
795 unsigned offset, unsigned to)
797 T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
799 if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
800 return yaffs_readpage_nolock(f, pg);
805 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
806 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
807 loff_t pos, unsigned len, unsigned copied,
808 struct page *pg, void *fsdadata)
812 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
815 addr = kva + offset_into_page;
818 ("yaffs_write_end addr %x pos %x nBytes %d\n",
822 ret = yaffs_file_write(filp, addr, copied, &pos);
826 ("yaffs_write_end not same size ret %d copied %d\n",
829 ClearPageUptodate(pg);
836 yaffs_release_space(filp);
838 page_cache_release(pg);
843 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
848 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
849 int nBytes = to - offset;
858 saddr = (unsigned) addr;
861 ("yaffs_commit_write addr %x pos %x nBytes %d\n",
862 saddr, spos, nBytes));
864 nWritten = yaffs_file_write(f, addr, nBytes, &pos);
866 if (nWritten != nBytes) {
868 ("yaffs_commit_write not same size nWritten %d nBytes %d\n",
871 ClearPageUptodate(pg);
879 ("yaffs_commit_write returning %d\n",
880 nWritten == nBytes ? 0 : nWritten));
882 return nWritten == nBytes ? 0 : nWritten;
887 static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
892 /* Check mode against the variant type and attempt to repair if broken. */
893 __u32 mode = obj->yst_mode;
894 switch (obj->variantType) {
895 case YAFFS_OBJECT_TYPE_FILE:
896 if (!S_ISREG(mode)) {
897 obj->yst_mode &= ~S_IFMT;
898 obj->yst_mode |= S_IFREG;
902 case YAFFS_OBJECT_TYPE_SYMLINK:
903 if (!S_ISLNK(mode)) {
904 obj->yst_mode &= ~S_IFMT;
905 obj->yst_mode |= S_IFLNK;
909 case YAFFS_OBJECT_TYPE_DIRECTORY:
910 if (!S_ISDIR(mode)) {
911 obj->yst_mode &= ~S_IFMT;
912 obj->yst_mode |= S_IFDIR;
916 case YAFFS_OBJECT_TYPE_UNKNOWN:
917 case YAFFS_OBJECT_TYPE_HARDLINK:
918 case YAFFS_OBJECT_TYPE_SPECIAL:
924 inode->i_flags |= S_NOATIME;
926 inode->i_ino = obj->objectId;
927 inode->i_mode = obj->yst_mode;
928 inode->i_uid = obj->yst_uid;
929 inode->i_gid = obj->yst_gid;
930 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
931 inode->i_blksize = inode->i_sb->s_blocksize;
933 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
935 inode->i_rdev = old_decode_dev(obj->yst_rdev);
936 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
937 inode->i_atime.tv_nsec = 0;
938 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
939 inode->i_mtime.tv_nsec = 0;
940 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
941 inode->i_ctime.tv_nsec = 0;
943 inode->i_rdev = obj->yst_rdev;
944 inode->i_atime = obj->yst_atime;
945 inode->i_mtime = obj->yst_mtime;
946 inode->i_ctime = obj->yst_ctime;
948 inode->i_size = yaffs_GetObjectFileLength(obj);
949 inode->i_blocks = (inode->i_size + 511) >> 9;
951 inode->i_nlink = yaffs_GetObjectLinkCount(obj);
954 ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
955 inode->i_mode, inode->i_uid, inode->i_gid,
956 (int)inode->i_size, atomic_read(&inode->i_count)));
958 switch (obj->yst_mode & S_IFMT) {
959 default: /* fifo, device or socket */
960 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
961 init_special_inode(inode, obj->yst_mode,
962 old_decode_dev(obj->yst_rdev));
964 init_special_inode(inode, obj->yst_mode,
965 (dev_t) (obj->yst_rdev));
968 case S_IFREG: /* file */
969 inode->i_op = &yaffs_file_inode_operations;
970 inode->i_fop = &yaffs_file_operations;
971 inode->i_mapping->a_ops =
972 &yaffs_file_address_operations;
974 case S_IFDIR: /* directory */
975 inode->i_op = &yaffs_dir_inode_operations;
976 inode->i_fop = &yaffs_dir_operations;
978 case S_IFLNK: /* symlink */
979 inode->i_op = &yaffs_symlink_inode_operations;
983 yaffs_InodeToObjectLV(inode) = obj;
985 obj->myInode = inode;
989 ("yaffs_FileInode invalid parameters\n"));
994 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1001 ("yaffs_get_inode for NULL super_block!!\n"));
1008 ("yaffs_get_inode for NULL object!!\n"));
1014 ("yaffs_get_inode for object %d\n", obj->objectId));
1016 inode = Y_IGET(sb, obj->objectId);
1020 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1021 /* iget also increments the inode's i_count */
1022 /* NB You can't be holding grossLock or deadlock will happen! */
1027 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1032 struct inode *inode;
1035 obj = yaffs_DentryToObject(f->f_dentry);
1039 yaffs_GrossLock(dev);
1041 inode = f->f_dentry->d_inode;
1043 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1044 ipos = inode->i_size;
1050 ("yaffs_file_write: hey obj is null!\n"));
1053 ("yaffs_file_write about to write writing %zu bytes"
1054 "to object %d at %d\n",
1055 n, obj->objectId, ipos));
1057 nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
1060 ("yaffs_file_write writing %zu bytes, %d written at %d\n",
1061 n, nWritten, ipos));
1066 if (ipos > inode->i_size) {
1067 inode->i_size = ipos;
1068 inode->i_blocks = (ipos + 511) >> 9;
1071 ("yaffs_file_write size updated to %d bytes, "
1073 ipos, (int)(inode->i_blocks)));
1077 yaffs_GrossUnlock(dev);
1078 return nWritten == 0 ? -ENOSPC : nWritten;
1081 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1082 /* For now we just assume few parallel writes and check against a small number. */
1083 /* Todo: need to do this with a counter to handle parallel reads better */
1085 static ssize_t yaffs_hold_space(struct file *f)
1093 obj = yaffs_DentryToObject(f->f_dentry);
1097 yaffs_GrossLock(dev);
1099 nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
1101 yaffs_GrossUnlock(dev);
1103 return (nFreeChunks > 20) ? 1 : 0;
1106 static void yaffs_release_space(struct file *f)
1112 obj = yaffs_DentryToObject(f->f_dentry);
1116 yaffs_GrossLock(dev);
1119 yaffs_GrossUnlock(dev);
1122 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1126 struct inode *inode = f->f_dentry->d_inode;
1127 unsigned long offset, curoffs;
1128 struct ylist_head *i;
1131 char name[YAFFS_MAX_NAME_LENGTH + 1];
1133 obj = yaffs_DentryToObject(f->f_dentry);
1136 yaffs_GrossLock(dev);
1140 T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
1144 ("yaffs_readdir: entry . ino %d \n",
1145 (int)inode->i_ino));
1146 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
1153 ("yaffs_readdir: entry .. ino %d \n",
1154 (int)f->f_dentry->d_parent->d_inode->i_ino));
1155 if (filldir(dirent, "..", 2, offset,
1156 f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
1164 /* If the directory has changed since the open or last call to
1165 readdir, rewind to after the 2 canned entries. */
1167 if (f->f_version != inode->i_version) {
1170 f->f_version = inode->i_version;
1173 ylist_for_each(i, &obj->variant.directoryVariant.children) {
1175 if (curoffs >= offset) {
1176 l = ylist_entry(i, yaffs_Object, siblings);
1178 yaffs_GetObjectName(l, name,
1179 YAFFS_MAX_NAME_LENGTH + 1);
1181 ("yaffs_readdir: %s inode %d\n", name,
1182 yaffs_GetObjectInode(l)));
1188 yaffs_GetObjectInode(l),
1189 yaffs_GetObjectType(l)) < 0)
1199 yaffs_GrossUnlock(dev);
1205 * File creation. Allocate an inode, and we're done..
1208 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1211 #define YCRED(x) (x->cred)
1214 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1215 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1218 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1222 struct inode *inode;
1224 yaffs_Object *obj = NULL;
1227 yaffs_Object *parent = yaffs_InodeToObject(dir);
1229 int error = -ENOSPC;
1230 uid_t uid = YCRED(current)->fsuid;
1231 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1233 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1238 ("yaffs_mknod: parent object %d type %d\n",
1239 parent->objectId, parent->variantType));
1242 ("yaffs_mknod: could not get parent object\n"));
1246 T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
1248 dentry->d_name.name, mode, rdev));
1250 dev = parent->myDev;
1252 yaffs_GrossLock(dev);
1254 switch (mode & S_IFMT) {
1256 /* Special (socket, fifo, device...) */
1257 T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
1258 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1259 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1260 gid, old_encode_dev(rdev));
1262 obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
1266 case S_IFREG: /* file */
1267 T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
1268 obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
1271 case S_IFDIR: /* directory */
1273 ("yaffs_mknod: making directory\n"));
1274 obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
1277 case S_IFLNK: /* symlink */
1278 T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
1279 obj = NULL; /* Do we ever get here? */
1283 /* Can not call yaffs_get_inode() with gross lock held */
1284 yaffs_GrossUnlock(dev);
1287 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1288 d_instantiate(dentry, inode);
1290 ("yaffs_mknod created object %d count = %d\n",
1291 obj->objectId, atomic_read(&inode->i_count)));
1295 ("yaffs_mknod failed making object\n"));
1302 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1305 T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
1306 retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1310 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1311 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1312 struct nameidata *n)
1314 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1317 T(YAFFS_TRACE_OS, ("yaffs_create\n"));
1318 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1321 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1328 ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
1329 dentry->d_name.name));
1331 dev = yaffs_InodeToObject(dir)->myDev;
1333 yaffs_GrossLock(dev);
1335 retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
1337 if (retVal == YAFFS_OK) {
1338 dentry->d_inode->i_nlink--;
1340 yaffs_GrossUnlock(dev);
1341 mark_inode_dirty(dentry->d_inode);
1344 yaffs_GrossUnlock(dev);
1351 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1352 struct dentry *dentry)
1354 struct inode *inode = old_dentry->d_inode;
1355 yaffs_Object *obj = NULL;
1356 yaffs_Object *link = NULL;
1359 T(YAFFS_TRACE_OS, ("yaffs_link\n"));
1361 obj = yaffs_InodeToObject(inode);
1364 yaffs_GrossLock(dev);
1366 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1367 link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
1371 old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
1372 d_instantiate(dentry, old_dentry->d_inode);
1373 atomic_inc(&old_dentry->d_inode->i_count);
1375 ("yaffs_link link count %d i_count %d\n",
1376 old_dentry->d_inode->i_nlink,
1377 atomic_read(&old_dentry->d_inode->i_count)));
1380 yaffs_GrossUnlock(dev);
1388 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1389 const char *symname)
1393 uid_t uid = YCRED(current)->fsuid;
1394 gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1396 T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
1398 dev = yaffs_InodeToObject(dir)->myDev;
1399 yaffs_GrossLock(dev);
1400 obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
1401 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1402 yaffs_GrossUnlock(dev);
1405 struct inode *inode;
1407 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1408 d_instantiate(dentry, inode);
1409 T(YAFFS_TRACE_OS, ("symlink created OK\n"));
1412 T(YAFFS_TRACE_OS, ("symlink not created\n"));
1418 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1425 obj = yaffs_DentryToObject(dentry);
1429 T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
1430 yaffs_GrossLock(dev);
1431 yaffs_FlushFile(obj, 1);
1432 yaffs_GrossUnlock(dev);
1437 * The VFS layer already does all the dentry stuff for rename.
1439 * NB: POSIX says you can rename an object over an old object of the same name
1441 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1442 struct inode *new_dir, struct dentry *new_dentry)
1445 int retVal = YAFFS_FAIL;
1446 yaffs_Object *target;
1448 T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
1449 dev = yaffs_InodeToObject(old_dir)->myDev;
1451 yaffs_GrossLock(dev);
1453 /* Check if the target is an existing directory that is not empty. */
1454 target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
1455 new_dentry->d_name.name);
1459 if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1460 !ylist_empty(&target->variant.directoryVariant.children)) {
1462 T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
1464 retVal = YAFFS_FAIL;
1466 /* Now does unlinking internally using shadowing mechanism */
1467 T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
1469 retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
1470 old_dentry->d_name.name,
1471 yaffs_InodeToObject(new_dir),
1472 new_dentry->d_name.name);
1474 yaffs_GrossUnlock(dev);
1476 if (retVal == YAFFS_OK) {
1478 new_dentry->d_inode->i_nlink--;
1479 mark_inode_dirty(new_dentry->d_inode);
1488 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1490 struct inode *inode = dentry->d_inode;
1495 ("yaffs_setattr of object %d\n",
1496 yaffs_InodeToObject(inode)->objectId));
1498 error = inode_change_ok(inode, attr);
1500 dev = yaffs_InodeToObject(inode)->myDev;
1501 yaffs_GrossLock(dev);
1502 if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
1508 yaffs_GrossUnlock(dev);
1510 error = inode_setattr(inode, attr);
1515 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1516 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1518 yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
1519 struct super_block *sb = dentry->d_sb;
1520 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1521 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
1523 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1525 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
1527 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1530 T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
1532 yaffs_GrossLock(dev);
1534 buf->f_type = YAFFS_MAGIC;
1535 buf->f_bsize = sb->s_blocksize;
1536 buf->f_namelen = 255;
1538 if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
1539 /* Do this if chunk size is not a power of 2 */
1541 uint64_t bytesInDev;
1544 bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
1545 ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
1547 do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
1548 buf->f_blocks = bytesInDev;
1550 bytesFree = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
1551 ((uint64_t)(dev->nDataBytesPerChunk));
1553 do_div(bytesFree, sb->s_blocksize);
1555 buf->f_bfree = bytesFree;
1557 } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
1560 (dev->endBlock - dev->startBlock + 1) *
1561 dev->nChunksPerBlock /
1562 (sb->s_blocksize / dev->nDataBytesPerChunk);
1564 yaffs_GetNumberOfFreeChunks(dev) /
1565 (sb->s_blocksize / dev->nDataBytesPerChunk);
1568 (dev->endBlock - dev->startBlock + 1) *
1569 dev->nChunksPerBlock *
1570 (dev->nDataBytesPerChunk / sb->s_blocksize);
1573 yaffs_GetNumberOfFreeChunks(dev) *
1574 (dev->nDataBytesPerChunk / sb->s_blocksize);
1579 buf->f_bavail = buf->f_bfree;
1581 yaffs_GrossUnlock(dev);
1586 static int yaffs_do_sync_fs(struct super_block *sb)
1589 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1590 T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
1593 yaffs_GrossLock(dev);
1596 yaffs_FlushEntireDeviceCache(dev);
1597 yaffs_CheckpointSave(dev);
1600 yaffs_GrossUnlock(dev);
1608 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1609 static void yaffs_write_super(struct super_block *sb)
1611 static int yaffs_write_super(struct super_block *sb)
1615 T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
1616 if (yaffs_auto_checkpoint >= 2)
1617 yaffs_do_sync_fs(sb);
1618 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
1624 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1625 static int yaffs_sync_fs(struct super_block *sb, int wait)
1627 static int yaffs_sync_fs(struct super_block *sb)
1630 T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
1632 if (yaffs_auto_checkpoint >= 1)
1633 yaffs_do_sync_fs(sb);
1638 #ifdef YAFFS_USE_OWN_IGET
1640 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1642 struct inode *inode;
1644 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1647 ("yaffs_iget for %lu\n", ino));
1649 inode = iget_locked(sb, ino);
1651 return ERR_PTR(-ENOMEM);
1652 if (!(inode->i_state & I_NEW))
1655 /* NB This is called as a side effect of other functions, but
1656 * we had to release the lock to prevent deadlocks, so
1657 * need to lock again.
1660 yaffs_GrossLock(dev);
1662 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1664 yaffs_FillInodeFromObject(inode, obj);
1666 yaffs_GrossUnlock(dev);
1668 unlock_new_inode(inode);
1674 static void yaffs_read_inode(struct inode *inode)
1676 /* NB This is called as a side effect of other functions, but
1677 * we had to release the lock to prevent deadlocks, so
1678 * need to lock again.
1682 yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
1685 ("yaffs_read_inode for %d\n", (int)inode->i_ino));
1687 yaffs_GrossLock(dev);
1689 obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
1691 yaffs_FillInodeFromObject(inode, obj);
1693 yaffs_GrossUnlock(dev);
1698 static YLIST_HEAD(yaffs_dev_list);
1700 #if 0 /* not used */
1701 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1703 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1705 if (*flags & MS_RDONLY) {
1706 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1709 ("yaffs_remount_fs: %s: RO\n", dev->name));
1711 yaffs_GrossLock(dev);
1713 yaffs_FlushEntireDeviceCache(dev);
1715 yaffs_CheckpointSave(dev);
1720 yaffs_GrossUnlock(dev);
1723 ("yaffs_remount_fs: %s: RW\n", dev->name));
1730 static void yaffs_put_super(struct super_block *sb)
1732 yaffs_Device *dev = yaffs_SuperToDevice(sb);
1734 T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
1736 yaffs_GrossLock(dev);
1738 yaffs_FlushEntireDeviceCache(dev);
1740 yaffs_CheckpointSave(dev);
1742 if (dev->putSuperFunc)
1743 dev->putSuperFunc(sb);
1745 yaffs_Deinitialise(dev);
1747 yaffs_GrossUnlock(dev);
1749 /* we assume this is protected by lock_kernel() in mount/umount */
1750 ylist_del(&dev->devList);
1752 if (dev->spareBuffer) {
1753 YFREE(dev->spareBuffer);
1754 dev->spareBuffer = NULL;
1761 static void yaffs_MTDPutSuper(struct super_block *sb)
1763 struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
1768 put_mtd_device(mtd);
1772 static void yaffs_MarkSuperBlockDirty(void *vsb)
1774 struct super_block *sb = (struct super_block *)vsb;
1776 T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
1783 int skip_checkpoint_read;
1784 int skip_checkpoint_write;
1788 #define MAX_OPT_LEN 20
1789 static int yaffs_parse_options(yaffs_options *options, const char *options_str)
1791 char cur_opt[MAX_OPT_LEN + 1];
1795 /* Parse through the options which is a comma seperated list */
1797 while (options_str && *options_str && !error) {
1798 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1801 while (*options_str && *options_str != ',') {
1802 if (p < MAX_OPT_LEN) {
1803 cur_opt[p] = *options_str;
1809 if (!strcmp(cur_opt, "inband-tags"))
1810 options->inband_tags = 1;
1811 else if (!strcmp(cur_opt, "no-cache"))
1812 options->no_cache = 1;
1813 else if (!strcmp(cur_opt, "no-checkpoint-read"))
1814 options->skip_checkpoint_read = 1;
1815 else if (!strcmp(cur_opt, "no-checkpoint-write"))
1816 options->skip_checkpoint_write = 1;
1817 else if (!strcmp(cur_opt, "no-checkpoint")) {
1818 options->skip_checkpoint_read = 1;
1819 options->skip_checkpoint_write = 1;
1821 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1830 static struct super_block *yaffs_internal_read_super(int yaffsVersion,
1831 struct super_block *sb,
1832 void *data, int silent)
1835 struct inode *inode = NULL;
1836 struct dentry *root;
1837 yaffs_Device *dev = 0;
1838 char devname_buf[BDEVNAME_SIZE + 1];
1839 struct mtd_info *mtd;
1841 char *data_str = (char *)data;
1843 yaffs_options options;
1845 sb->s_magic = YAFFS_MAGIC;
1846 sb->s_op = &yaffs_super_ops;
1847 sb->s_flags |= MS_NOATIME;
1850 printk(KERN_INFO "yaffs: sb is NULL\n");
1851 else if (!sb->s_dev)
1852 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1853 else if (!yaffs_devname(sb, devname_buf))
1854 printk(KERN_INFO "yaffs: devname is NULL\n");
1856 printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
1858 yaffs_devname(sb, devname_buf));
1863 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1865 memset(&options, 0, sizeof(options));
1867 if (yaffs_parse_options(&options, data_str)) {
1868 /* Option parsing failed */
1873 sb->s_blocksize = PAGE_CACHE_SIZE;
1874 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
1875 T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
1877 ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
1879 #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
1881 ("yaffs: Write verification disabled. All guarantees "
1882 "null and void\n"));
1885 T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
1887 MAJOR(sb->s_dev), MINOR(sb->s_dev),
1888 yaffs_devname(sb, devname_buf)));
1890 /* Check it's an mtd device..... */
1891 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
1892 return NULL; /* This isn't an mtd device */
1894 /* Get the device */
1895 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1897 T(YAFFS_TRACE_ALWAYS,
1898 ("yaffs: MTD device #%u doesn't appear to exist\n",
1902 /* Check it's NAND */
1903 if (mtd->type != MTD_NANDFLASH) {
1904 T(YAFFS_TRACE_ALWAYS,
1905 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
1909 T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
1910 T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
1911 T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
1912 T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
1913 T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
1914 T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
1915 T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
1916 T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
1917 T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
1918 T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
1919 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1920 T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
1922 T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
1925 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
1927 if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
1928 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
1932 /* Added NCB 26/5/2006 for completeness */
1933 if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
1934 T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
1940 if (yaffsVersion == 2) {
1941 /* Check for version 2 style functions */
1943 !mtd->block_isbad ||
1944 !mtd->block_markbad ||
1947 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1948 !mtd->read_oob || !mtd->write_oob) {
1951 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1953 T(YAFFS_TRACE_ALWAYS,
1954 ("yaffs: MTD device does not support required "
1959 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
1960 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
1961 !options.inband_tags) {
1962 T(YAFFS_TRACE_ALWAYS,
1963 ("yaffs: MTD device does not have the "
1964 "right page sizes\n"));
1968 /* Check for V1 style functions */
1972 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
1973 !mtd->read_oob || !mtd->write_oob) {
1976 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
1978 T(YAFFS_TRACE_ALWAYS,
1979 ("yaffs: MTD device does not support required "
1984 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
1985 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
1986 T(YAFFS_TRACE_ALWAYS,
1987 ("yaffs: MTD device does not support have the "
1988 "right page sizes\n"));
1993 /* OK, so if we got here, we have an MTD that's NAND and looks
1994 * like it has the right capabilities
1995 * Set the yaffs_Device up for mtd
1998 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1999 sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2001 sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
2004 /* Deep shit could not allocate device structure */
2005 T(YAFFS_TRACE_ALWAYS,
2006 ("yaffs_read_super: Failed trying to allocate "
2007 "yaffs_Device. \n"));
2011 memset(dev, 0, sizeof(yaffs_Device));
2012 dev->genericDevice = mtd;
2013 dev->name = mtd->name;
2015 /* Set up the memory size parameters.... */
2017 nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2019 dev->startBlock = 0;
2020 dev->endBlock = nBlocks - 1;
2021 dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
2022 dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
2023 dev->nReservedBlocks = 5;
2024 dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
2025 dev->inbandTags = options.inband_tags;
2027 /* ... and the functions. */
2028 if (yaffsVersion == 2) {
2029 dev->writeChunkWithTagsToNAND =
2030 nandmtd2_WriteChunkWithTagsToNAND;
2031 dev->readChunkWithTagsFromNAND =
2032 nandmtd2_ReadChunkWithTagsFromNAND;
2033 dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
2034 dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
2035 dev->spareBuffer = YMALLOC(mtd->oobsize);
2037 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2038 dev->totalBytesPerChunk = mtd->writesize;
2039 dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
2041 dev->totalBytesPerChunk = mtd->oobblock;
2042 dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
2044 nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2046 dev->startBlock = 0;
2047 dev->endBlock = nBlocks - 1;
2049 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2050 /* use the MTD interface in yaffs_mtdif1.c */
2051 dev->writeChunkWithTagsToNAND =
2052 nandmtd1_WriteChunkWithTagsToNAND;
2053 dev->readChunkWithTagsFromNAND =
2054 nandmtd1_ReadChunkWithTagsFromNAND;
2055 dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
2056 dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
2058 dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
2059 dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
2063 /* ... and common functions */
2064 dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
2065 dev->initialiseNAND = nandmtd_InitialiseNAND;
2067 dev->putSuperFunc = yaffs_MTDPutSuper;
2069 dev->superBlock = (void *)sb;
2070 dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
2073 #ifndef CONFIG_YAFFS_DOES_ECC
2074 dev->useNANDECC = 1;
2077 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2078 dev->wideTnodesDisabled = 1;
2081 dev->skipCheckpointRead = options.skip_checkpoint_read;
2082 dev->skipCheckpointWrite = options.skip_checkpoint_write;
2084 /* we assume this is protected by lock_kernel() in mount/umount */
2085 ylist_add_tail(&dev->devList, &yaffs_dev_list);
2087 init_MUTEX(&dev->grossLock);
2089 yaffs_GrossLock(dev);
2091 err = yaffs_GutsInitialise(dev);
2094 ("yaffs_read_super: guts initialised %s\n",
2095 (err == YAFFS_OK) ? "OK" : "FAILED"));
2097 /* Release lock before yaffs_get_inode() */
2098 yaffs_GrossUnlock(dev);
2100 /* Create root inode */
2101 if (err == YAFFS_OK)
2102 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
2108 inode->i_op = &yaffs_dir_inode_operations;
2109 inode->i_fop = &yaffs_dir_operations;
2111 T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
2113 root = d_alloc_root(inode);
2115 T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
2122 sb->s_dirt = !dev->isCheckpointed;
2123 T(YAFFS_TRACE_ALWAYS,
2124 ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
2126 T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
2131 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2132 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2135 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2138 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2139 static int yaffs_read_super(struct file_system_type *fs,
2140 int flags, const char *dev_name,
2141 void *data, struct vfsmount *mnt)
2144 return get_sb_bdev(fs, flags, dev_name, data,
2145 yaffs_internal_read_super_mtd, mnt);
2148 static struct super_block *yaffs_read_super(struct file_system_type *fs,
2149 int flags, const char *dev_name,
2153 return get_sb_bdev(fs, flags, dev_name, data,
2154 yaffs_internal_read_super_mtd);
2158 static struct file_system_type yaffs_fs_type = {
2159 .owner = THIS_MODULE,
2161 .get_sb = yaffs_read_super,
2162 .kill_sb = kill_block_super,
2163 .fs_flags = FS_REQUIRES_DEV,
2166 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
2169 return yaffs_internal_read_super(1, sb, data, silent);
2172 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
2177 #ifdef CONFIG_YAFFS_YAFFS2
2179 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2180 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2183 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2186 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2187 static int yaffs2_read_super(struct file_system_type *fs,
2188 int flags, const char *dev_name, void *data,
2189 struct vfsmount *mnt)
2191 return get_sb_bdev(fs, flags, dev_name, data,
2192 yaffs2_internal_read_super_mtd, mnt);
2195 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
2196 int flags, const char *dev_name,
2200 return get_sb_bdev(fs, flags, dev_name, data,
2201 yaffs2_internal_read_super_mtd);
2205 static struct file_system_type yaffs2_fs_type = {
2206 .owner = THIS_MODULE,
2208 .get_sb = yaffs2_read_super,
2209 .kill_sb = kill_block_super,
2210 .fs_flags = FS_REQUIRES_DEV,
2213 static struct super_block *yaffs2_read_super(struct super_block *sb,
2214 void *data, int silent)
2216 return yaffs_internal_read_super(2, sb, data, silent);
2219 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
2223 #endif /* CONFIG_YAFFS_YAFFS2 */
2225 static struct proc_dir_entry *my_proc_entry;
2227 static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
2229 buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
2230 buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
2231 buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
2232 buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
2233 buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
2234 buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
2235 buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
2236 buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
2237 buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
2238 buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
2239 buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
2240 buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
2241 buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
2242 buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
2243 buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
2244 buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
2245 buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
2246 buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
2247 buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
2248 buf += sprintf(buf, "passiveGCs......... %d\n",
2249 dev->passiveGarbageCollections);
2250 buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
2251 buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
2252 buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
2253 buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
2254 buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
2255 buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
2256 buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
2257 buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
2258 buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
2259 buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
2261 sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
2262 buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
2263 buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
2264 buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
2269 static int yaffs_proc_read(char *page,
2271 off_t offset, int count, int *eof, void *data)
2273 struct ylist_head *item;
2278 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2279 * We use 'offset' (*ppos) to indicate where we are in devList.
2280 * This also assumes the user has posted a read buffer large
2281 * enough to hold the complete output; but that's life in /proc.
2286 /* Print header first */
2288 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
2289 "\n%s\n%s\n", yaffs_fs_c_version,
2290 yaffs_guts_c_version);
2293 /* hold lock_kernel while traversing yaffs_dev_list */
2296 /* Locate and print the Nth entry. Order N-squared but N is small. */
2297 ylist_for_each(item, &yaffs_dev_list) {
2298 yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
2303 buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
2304 buf = yaffs_dump_dev(buf, dev);
2309 return buf - page < count ? buf - page : count;
2313 * Set the verbosity of the warnings and error messages.
2315 * Note that the names can only be a..z or _ with the current code.
2320 unsigned mask_bitfield;
2322 {"allocate", YAFFS_TRACE_ALLOCATE},
2323 {"always", YAFFS_TRACE_ALWAYS},
2324 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2325 {"buffers", YAFFS_TRACE_BUFFERS},
2326 {"bug", YAFFS_TRACE_BUG},
2327 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2328 {"deletion", YAFFS_TRACE_DELETION},
2329 {"erase", YAFFS_TRACE_ERASE},
2330 {"error", YAFFS_TRACE_ERROR},
2331 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2332 {"gc", YAFFS_TRACE_GC},
2333 {"mtd", YAFFS_TRACE_MTD},
2334 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2335 {"os", YAFFS_TRACE_OS},
2336 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2337 {"scan", YAFFS_TRACE_SCAN},
2338 {"tracing", YAFFS_TRACE_TRACING},
2340 {"verify", YAFFS_TRACE_VERIFY},
2341 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2342 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2343 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2345 {"write", YAFFS_TRACE_WRITE},
2346 {"all", 0xffffffff},
2351 #define MAX_MASK_NAME_LENGTH 40
2352 static int yaffs_proc_write(struct file *file, const char *buf,
2353 unsigned long count, void *data)
2355 unsigned rg = 0, mask_bitfield;
2359 char substring[MAX_MASK_NAME_LENGTH + 1];
2365 rg = yaffs_traceMask;
2367 while (!done && (pos < count)) {
2369 while ((pos < count) && isspace(buf[pos]))
2386 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2388 if (end > buf + pos) {
2389 mask_name = "numeral";
2390 len = end - (buf + pos);
2394 for (x = buf + pos, i = 0;
2395 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2396 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2398 substring[i] = '\0';
2400 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2401 if (strcmp(substring, mask_flags[i].mask_name) == 0) {
2402 mask_name = mask_flags[i].mask_name;
2403 mask_bitfield = mask_flags[i].mask_bitfield;
2410 if (mask_name != NULL) {
2414 rg &= ~mask_bitfield;
2417 rg |= mask_bitfield;
2423 rg |= mask_bitfield;
2429 yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
2431 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
2433 if (rg & YAFFS_TRACE_ALWAYS) {
2434 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2436 flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
2437 printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
2444 /* Stuff to handle installation of file systems */
2445 struct file_system_to_install {
2446 struct file_system_type *fst;
2450 static struct file_system_to_install fs_to_install[] = {
2451 {&yaffs_fs_type, 0},
2452 {&yaffs2_fs_type, 0},
2456 static int __init init_yaffs_fs(void)
2459 struct file_system_to_install *fsinst;
2461 T(YAFFS_TRACE_ALWAYS,
2462 ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
2464 /* Install the proc_fs entry */
2465 my_proc_entry = create_proc_entry("yaffs",
2469 if (my_proc_entry) {
2470 my_proc_entry->write_proc = yaffs_proc_write;
2471 my_proc_entry->read_proc = yaffs_proc_read;
2472 my_proc_entry->data = NULL;
2476 /* Now add the file system entries */
2478 fsinst = fs_to_install;
2480 while (fsinst->fst && !error) {
2481 error = register_filesystem(fsinst->fst);
2483 fsinst->installed = 1;
2487 /* Any errors? uninstall */
2489 fsinst = fs_to_install;
2491 while (fsinst->fst) {
2492 if (fsinst->installed) {
2493 unregister_filesystem(fsinst->fst);
2494 fsinst->installed = 0;
2503 static void __exit exit_yaffs_fs(void)
2506 struct file_system_to_install *fsinst;
2508 T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
2511 remove_proc_entry("yaffs", YPROC_ROOT);
2513 fsinst = fs_to_install;
2515 while (fsinst->fst) {
2516 if (fsinst->installed) {
2517 unregister_filesystem(fsinst->fst);
2518 fsinst->installed = 0;
2524 module_init(init_yaffs_fs)
2525 module_exit(exit_yaffs_fs)
2527 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2528 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
2529 MODULE_LICENSE("GPL");