2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
23 * This is the file system front-end to YAFFS that hooks it up to
27 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
35 * There are two variants of the VFS glue code. This variant should compile
36 * for any version of Linux.
38 #include <linux/version.h>
40 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
41 #define YAFFS_COMPILE_BACKGROUND
42 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
43 #define YAFFS_COMPILE_FREEZER
47 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
48 #define YAFFS_COMPILE_EXPORTFS
51 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
52 #define YAFFS_USE_SETATTR_COPY
53 #define YAFFS_USE_TRUNCATE_SETSIZE
55 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
56 #define YAFFS_HAS_EVICT_INODE
59 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
60 #define YAFFS_NEW_FOLLOW_LINK 1
62 #define YAFFS_NEW_FOLLOW_LINK 0
65 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
66 #include <linux/config.h>
69 #include <linux/kernel.h>
70 #include <linux/module.h>
71 #include <linux/slab.h>
72 #include <linux/init.h>
74 #include <linux/proc_fs.h>
75 #include <linux/smp_lock.h>
76 #include <linux/pagemap.h>
77 #include <linux/mtd/mtd.h>
78 #include <linux/interrupt.h>
79 #include <linux/string.h>
80 #include <linux/ctype.h>
82 #if (YAFFS_NEW_FOLLOW_LINK == 1)
83 #include <linux/namei.h>
86 #ifdef YAFFS_COMPILE_EXPORTFS
87 #include <linux/exportfs.h>
90 #ifdef YAFFS_COMPILE_BACKGROUND
91 #include <linux/kthread.h>
92 #include <linux/delay.h>
94 #ifdef YAFFS_COMPILE_FREEZER
95 #include <linux/freezer.h>
98 #include <asm/div64.h>
100 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
102 #include <linux/statfs.h>
104 #define UnlockPage(p) unlock_page(p)
105 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
107 /* FIXME: use sb->s_id instead ? */
108 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
112 #include <linux/locks.h>
113 #define BDEVNAME_SIZE 0
114 #define yaffs_devname(sb, buf) kdevname(sb->s_dev)
116 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
117 /* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
123 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
124 #define YPROC_ROOT (&proc_root)
126 #define YPROC_ROOT NULL
129 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
130 #define Y_INIT_TIMER(a) init_timer(a)
132 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
135 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
136 #define WRITE_SIZE_STR "writesize"
137 #define WRITE_SIZE(mtd) ((mtd)->writesize)
139 #define WRITE_SIZE_STR "oobblock"
140 #define WRITE_SIZE(mtd) ((mtd)->oobblock)
143 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
144 #define YAFFS_USE_WRITE_BEGIN_END 1
146 #define YAFFS_USE_WRITE_BEGIN_END 0
149 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
150 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
152 uint64_t result = partition_size;
153 do_div(result, block_size);
154 return (uint32_t) result;
157 #define YCALCBLOCKS(s, b) ((s)/(b))
160 #include <linux/uaccess.h>
161 #include <linux/mtd/mtd.h>
163 #include "yportenv.h"
164 #include "yaffs_trace.h"
165 #include "yaffs_guts.h"
166 #include "yaffs_attribs.h"
168 #include "yaffs_linux.h"
170 #include "yaffs_mtdif.h"
171 #include "yaffs_mtdif1.h"
172 #include "yaffs_mtdif2.h"
174 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
175 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
176 unsigned int yaffs_auto_checkpoint = 1;
177 unsigned int yaffs_gc_control = 1;
178 unsigned int yaffs_bg_enable = 1;
180 /* Module Parameters */
181 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
182 module_param(yaffs_trace_mask, uint, 0644);
183 module_param(yaffs_wr_attempts, uint, 0644);
184 module_param(yaffs_auto_checkpoint, uint, 0644);
185 module_param(yaffs_gc_control, uint, 0644);
186 module_param(yaffs_bg_enable, uint, 0644);
188 MODULE_PARM(yaffs_trace_mask, "i");
189 MODULE_PARM(yaffs_wr_attempts, "i");
190 MODULE_PARM(yaffs_auto_checkpoint, "i");
191 MODULE_PARM(yaffs_gc_control, "i");
194 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
195 /* use iget and read_inode */
196 #define Y_IGET(sb, inum) iget((sb), (inum))
197 static void yaffs_read_inode(struct inode *inode);
200 /* Call local equivalent */
201 #define YAFFS_USE_OWN_IGET
202 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
204 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
207 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
208 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
210 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
213 #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
214 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
216 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
217 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
219 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp)
222 #define update_dir_time(dir) do {\
223 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
226 static void yaffs_put_super(struct super_block *sb);
228 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
230 static ssize_t yaffs_hold_space(struct file *f);
231 static void yaffs_release_space(struct file *f);
233 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
234 static int yaffs_file_flush(struct file *file, fl_owner_t id);
236 static int yaffs_file_flush(struct file *file);
239 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
240 static int yaffs_sync_object(struct file *file, int datasync);
242 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
246 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
248 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
249 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
250 struct nameidata *n);
251 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
252 struct nameidata *n);
254 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
255 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
257 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
258 struct dentry *dentry);
259 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
260 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
261 const char *symname);
262 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
264 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
265 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
268 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
271 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
272 struct inode *new_dir, struct dentry *new_dentry);
273 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
275 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
276 static int yaffs_sync_fs(struct super_block *sb, int wait);
277 static void yaffs_write_super(struct super_block *sb);
279 static int yaffs_sync_fs(struct super_block *sb);
280 static int yaffs_write_super(struct super_block *sb);
283 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
284 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
285 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
286 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
288 static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
291 #ifdef YAFFS_HAS_PUT_INODE
292 static void yaffs_put_inode(struct inode *inode);
295 #ifdef YAFFS_HAS_EVICT_INODE
296 static void yaffs_evict_inode(struct inode *);
298 static void yaffs_delete_inode(struct inode *);
299 static void yaffs_clear_inode(struct inode *);
302 static int yaffs_readpage(struct file *file, struct page *page);
303 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
304 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
306 static int yaffs_writepage(struct page *page);
309 #ifdef CONFIG_YAFFS_XATTR
310 static int yaffs_setxattr(struct dentry *dentry, const char *name,
311 const void *value, size_t size, int flags);
312 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
314 static int yaffs_removexattr(struct dentry *dentry, const char *name);
315 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
318 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
319 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
320 loff_t pos, unsigned len, unsigned flags,
321 struct page **pagep, void **fsdata);
322 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
323 loff_t pos, unsigned len, unsigned copied,
324 struct page *pg, void *fsdadata);
326 static int yaffs_prepare_write(struct file *f, struct page *pg,
327 unsigned offset, unsigned to);
328 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
333 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
335 #if (YAFFS_NEW_FOLLOW_LINK == 1)
336 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
337 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
339 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
342 static void yaffs_touch_super(struct yaffs_dev *dev);
344 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
346 static struct address_space_operations yaffs_file_address_operations = {
347 .readpage = yaffs_readpage,
348 .writepage = yaffs_writepage,
349 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
350 .write_begin = yaffs_write_begin,
351 .write_end = yaffs_write_end,
353 .prepare_write = yaffs_prepare_write,
354 .commit_write = yaffs_commit_write,
358 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
359 static const struct file_operations yaffs_file_operations = {
360 .read = do_sync_read,
361 .write = do_sync_write,
362 .aio_read = generic_file_aio_read,
363 .aio_write = generic_file_aio_write,
364 .mmap = generic_file_mmap,
365 .flush = yaffs_file_flush,
366 .fsync = yaffs_sync_object,
367 .splice_read = generic_file_splice_read,
368 .splice_write = generic_file_splice_write,
369 .llseek = generic_file_llseek,
372 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
374 static const struct file_operations yaffs_file_operations = {
375 .read = do_sync_read,
376 .write = do_sync_write,
377 .aio_read = generic_file_aio_read,
378 .aio_write = generic_file_aio_write,
379 .mmap = generic_file_mmap,
380 .flush = yaffs_file_flush,
381 .fsync = yaffs_sync_object,
382 .sendfile = generic_file_sendfile,
387 static const struct file_operations yaffs_file_operations = {
388 .read = generic_file_read,
389 .write = generic_file_write,
390 .mmap = generic_file_mmap,
391 .flush = yaffs_file_flush,
392 .fsync = yaffs_sync_object,
393 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
394 .sendfile = generic_file_sendfile,
399 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
400 static void zero_user_segment(struct page *page, unsigned start, unsigned end)
402 void *kaddr = kmap_atomic(page, KM_USER0);
403 memset(kaddr + start, 0, end - start);
404 kunmap_atomic(kaddr, KM_USER0);
405 flush_dcache_page(page);
409 static const struct inode_operations yaffs_file_inode_operations = {
410 .setattr = yaffs_setattr,
411 #ifdef CONFIG_YAFFS_XATTR
412 .setxattr = yaffs_setxattr,
413 .getxattr = yaffs_getxattr,
414 .listxattr = yaffs_listxattr,
415 .removexattr = yaffs_removexattr,
419 static const struct inode_operations yaffs_symlink_inode_operations = {
420 .readlink = yaffs_readlink,
421 .follow_link = yaffs_follow_link,
422 #if (YAFFS_NEW_FOLLOW_LINK == 1)
423 .put_link = yaffs_put_link,
425 .setattr = yaffs_setattr,
426 #ifdef CONFIG_YAFFS_XATTR
427 .setxattr = yaffs_setxattr,
428 .getxattr = yaffs_getxattr,
429 .listxattr = yaffs_listxattr,
430 .removexattr = yaffs_removexattr,
434 static const struct inode_operations yaffs_dir_inode_operations = {
435 .create = yaffs_create,
436 .lookup = yaffs_lookup,
438 .unlink = yaffs_unlink,
439 .symlink = yaffs_symlink,
440 .mkdir = yaffs_mkdir,
441 .rmdir = yaffs_unlink,
442 .mknod = yaffs_mknod,
443 .rename = yaffs_rename,
444 .setattr = yaffs_setattr,
445 #ifdef CONFIG_YAFFS_XATTR
446 .setxattr = yaffs_setxattr,
447 .getxattr = yaffs_getxattr,
448 .listxattr = yaffs_listxattr,
449 .removexattr = yaffs_removexattr,
453 static const struct file_operations yaffs_dir_operations = {
454 .read = generic_read_dir,
455 .readdir = yaffs_readdir,
456 .fsync = yaffs_sync_object,
457 .llseek = generic_file_llseek,
460 static const struct super_operations yaffs_super_ops = {
461 .statfs = yaffs_statfs,
463 #ifndef YAFFS_USE_OWN_IGET
464 .read_inode = yaffs_read_inode,
466 #ifdef YAFFS_HAS_PUT_INODE
467 .put_inode = yaffs_put_inode,
469 .put_super = yaffs_put_super,
470 #ifdef YAFFS_HAS_EVICT_INODE
471 .evict_inode = yaffs_evict_inode,
473 .delete_inode = yaffs_delete_inode,
474 .clear_inode = yaffs_clear_inode,
476 .sync_fs = yaffs_sync_fs,
477 .write_super = yaffs_write_super,
480 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
482 #ifdef YAFFS_USE_SETATTR_COPY
483 setattr_copy(inode, attr);
486 return inode_setattr(inode, attr);
491 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
493 #ifdef YAFFS_USE_TRUNCATE_SETSIZE
494 truncate_setsize(inode, newsize);
497 truncate_inode_pages(&inode->i_data, newsize);
503 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
505 return yaffs_gc_control;
508 static void yaffs_gross_lock(struct yaffs_dev *dev)
510 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
511 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
512 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
515 static void yaffs_gross_unlock(struct yaffs_dev *dev)
517 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
518 mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
521 #ifdef YAFFS_COMPILE_EXPORTFS
523 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
526 return Y_IGET(sb, ino);
529 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
530 struct fid *fid, int fh_len,
533 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
534 yaffs2_nfs_get_inode);
537 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
538 struct fid *fid, int fh_len,
541 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
542 yaffs2_nfs_get_inode);
545 struct dentry *yaffs2_get_parent(struct dentry *dentry)
548 struct super_block *sb = dentry->d_inode->i_sb;
549 struct dentry *parent = ERR_PTR(-ENOENT);
551 unsigned long parent_ino;
552 struct yaffs_obj *d_obj;
553 struct yaffs_obj *parent_obj;
555 d_obj = yaffs_inode_to_obj(dentry->d_inode);
558 parent_obj = d_obj->parent;
560 parent_ino = yaffs_get_obj_inode(parent_obj);
561 inode = Y_IGET(sb, parent_ino);
564 parent = ERR_CAST(inode);
566 parent = d_obtain_alias(inode);
567 if (!IS_ERR(parent)) {
568 parent = ERR_PTR(-ENOMEM);
578 /* Just declare a zero structure as a NULL value implies
579 * using the default functions of exportfs.
582 static struct export_operations yaffs_export_ops = {
583 .fh_to_dentry = yaffs2_fh_to_dentry,
584 .fh_to_parent = yaffs2_fh_to_parent,
585 .get_parent = yaffs2_get_parent,
590 /*-----------------------------------------------------------------*/
591 /* Directory search context allows us to unlock access to yaffs during
592 * filldir without causing problems with the directory being modified.
593 * This is similar to the tried and tested mechanism used in yaffs direct.
595 * A search context iterates along a doubly linked list of siblings in the
596 * directory. If the iterating object is deleted then this would corrupt
597 * the list iteration, likely causing a crash. The search context avoids
598 * this by using the remove_obj_fn to move the search context to the
599 * next object before the object is deleted.
601 * Many readdirs (and thus seach conexts) may be alive simulateously so
602 * each struct yaffs_dev has a list of these.
604 * A seach context lives for the duration of a readdir.
606 * All these functions must be called while yaffs is locked.
609 struct yaffs_search_context {
610 struct yaffs_dev *dev;
611 struct yaffs_obj *dir_obj;
612 struct yaffs_obj *next_return;
613 struct list_head others;
617 * yaffs_new_search() creates a new search context, initialises it and
618 * adds it to the device's search context list.
620 * Called at start of readdir.
622 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
624 struct yaffs_dev *dev = dir->my_dev;
625 struct yaffs_search_context *sc =
626 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
630 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
631 sc->next_return = NULL;
634 list_entry(dir->variant.dir_variant.children.next,
635 struct yaffs_obj, siblings);
636 INIT_LIST_HEAD(&sc->others);
637 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
643 * yaffs_search_end() disposes of a search context and cleans up.
645 static void yaffs_search_end(struct yaffs_search_context *sc)
648 list_del(&sc->others);
654 * yaffs_search_advance() moves a search context to the next object.
655 * Called when the search iterates or when an object removal causes
656 * the search context to be moved to the next object.
658 static void yaffs_search_advance(struct yaffs_search_context *sc)
663 if (sc->next_return == NULL ||
664 list_empty(&sc->dir_obj->variant.dir_variant.children))
665 sc->next_return = NULL;
667 struct list_head *next = sc->next_return->siblings.next;
669 if (next == &sc->dir_obj->variant.dir_variant.children)
670 sc->next_return = NULL; /* end of list */
673 list_entry(next, struct yaffs_obj, siblings);
678 * yaffs_remove_obj_callback() is called when an object is unlinked.
679 * We check open search contexts and advance any which are currently
680 * on the object being iterated.
682 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
686 struct yaffs_search_context *sc;
687 struct list_head *search_contexts =
688 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
690 /* Iterate through the directory search contexts.
691 * If any are currently on the object being removed, then advance
692 * the search context to the next object to prevent a hanging pointer.
694 list_for_each(i, search_contexts) {
695 sc = list_entry(i, struct yaffs_search_context, others);
696 if (sc->next_return == obj)
697 yaffs_search_advance(sc);
702 /*-----------------------------------------------------------------*/
704 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
707 unsigned char *alias;
710 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
712 yaffs_gross_lock(dev);
714 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
716 yaffs_gross_unlock(dev);
721 ret = vfs_readlink(dentry, buffer, buflen, alias);
726 #if (YAFFS_NEW_FOLLOW_LINK == 1)
727 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
731 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
735 unsigned char *alias;
737 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
739 yaffs_gross_lock(dev);
741 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
742 yaffs_gross_unlock(dev);
748 #if (YAFFS_NEW_FOLLOW_LINK == 1)
749 nd_set_link(nd, alias);
753 ret = ERR_PTR(ret_int);
756 ret = vfs_follow_link(nd, alias);
765 #if (YAFFS_NEW_FOLLOW_LINK == 1)
766 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
772 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
773 struct yaffs_obj *obj);
776 * Lookup is used to find objects in the fs
778 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
780 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
783 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
786 struct yaffs_obj *obj;
787 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
789 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
791 if (current != yaffs_dev_to_lc(dev)->readdir_process)
792 yaffs_gross_lock(dev);
794 yaffs_trace(YAFFS_TRACE_OS,"yaffs_lookup for %d:%s",
795 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
797 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
799 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
801 /* Can't hold gross lock when calling yaffs_get_inode() */
802 if (current != yaffs_dev_to_lc(dev)->readdir_process)
803 yaffs_gross_unlock(dev);
806 yaffs_trace(YAFFS_TRACE_OS,
807 "yaffs_lookup found %d", obj->obj_id);
809 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
811 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
815 /* added NCB for 2.5/6 compatability - forces add even if inode is
816 * NULL which creates dentry hash */
817 d_add(dentry, inode);
822 #ifdef YAFFS_HAS_PUT_INODE
824 /* For now put inode is just for debugging
825 * Put inode is called when the inode **structure** is put.
827 static void yaffs_put_inode(struct inode *inode)
829 yaffs_trace(YAFFS_TRACE_OS,
830 "yaffs_put_inode: ino %d, count %d"),
831 (int)inode->i_ino, atomic_read(&inode->i_count);
836 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
838 /* Clear the association between the inode and
839 * the struct yaffs_obj.
841 obj->my_inode = NULL;
842 yaffs_inode_to_obj_lv(inode) = NULL;
844 /* If the object freeing was deferred, then the real
846 * This should fix the inode inconsistency problem.
848 yaffs_handle_defered_free(obj);
851 #ifdef YAFFS_HAS_EVICT_INODE
852 /* yaffs_evict_inode combines into one operation what was previously done in
853 * yaffs_clear_inode() and yaffs_delete_inode()
856 static void yaffs_evict_inode(struct inode *inode)
858 struct yaffs_obj *obj;
859 struct yaffs_dev *dev;
862 obj = yaffs_inode_to_obj(inode);
864 yaffs_trace(YAFFS_TRACE_OS,
865 "yaffs_evict_inode: ino %d, count %d %s",
866 (int)inode->i_ino, atomic_read(&inode->i_count),
867 obj ? "object exists" : "null object");
869 if (!inode->i_nlink && !is_bad_inode(inode))
871 truncate_inode_pages(&inode->i_data, 0);
872 end_writeback(inode);
874 if (deleteme && obj) {
876 yaffs_gross_lock(dev);
878 yaffs_gross_unlock(dev);
882 yaffs_gross_lock(dev);
883 yaffs_unstitch_obj(inode, obj);
884 yaffs_gross_unlock(dev);
889 /* clear is called to tell the fs to release any per-inode data it holds.
890 * The object might still exist on disk and is just being thrown out of the cache
891 * or else the object has actually been deleted and we're being called via
893 * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
896 static void yaffs_clear_inode(struct inode *inode)
898 struct yaffs_obj *obj;
899 struct yaffs_dev *dev;
901 obj = yaffs_inode_to_obj(inode);
903 yaffs_trace(YAFFS_TRACE_OS,
904 "yaffs_clear_inode: ino %d, count %d %s",
905 (int)inode->i_ino, atomic_read(&inode->i_count),
906 obj ? "object exists" : "null object");
910 yaffs_gross_lock(dev);
911 yaffs_unstitch_obj(inode, obj);
912 yaffs_gross_unlock(dev);
917 /* delete is called when the link count is zero and the inode
918 * is put (ie. nobody wants to know about it anymore, time to
920 * NB Must call clear_inode()
922 static void yaffs_delete_inode(struct inode *inode)
924 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
925 struct yaffs_dev *dev;
927 yaffs_trace(YAFFS_TRACE_OS,
928 "yaffs_delete_inode: ino %d, count %d %s",
929 (int)inode->i_ino, atomic_read(&inode->i_count),
930 obj ? "object exists" : "null object");
934 yaffs_gross_lock(dev);
936 yaffs_gross_unlock(dev);
938 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
939 truncate_inode_pages(&inode->i_data, 0);
945 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
946 static int yaffs_file_flush(struct file *file, fl_owner_t id)
948 static int yaffs_file_flush(struct file *file)
951 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
953 struct yaffs_dev *dev = obj->my_dev;
955 yaffs_trace(YAFFS_TRACE_OS,
956 "yaffs_file_flush object %d (%s)",
958 obj->dirty ? "dirty" : "clean");
960 yaffs_gross_lock(dev);
962 yaffs_flush_file(obj, 1, 0);
964 yaffs_gross_unlock(dev);
969 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
971 /* Lifted from jffs2 */
973 struct yaffs_obj *obj;
974 unsigned char *pg_buf;
977 struct yaffs_dev *dev;
979 yaffs_trace(YAFFS_TRACE_OS,
980 "yaffs_readpage_nolock at %08x, size %08x",
981 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
982 (unsigned)PAGE_CACHE_SIZE);
984 obj = yaffs_dentry_to_obj(f->f_dentry);
988 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
989 BUG_ON(!PageLocked(pg));
996 /* FIXME: Can kmap fail? */
998 yaffs_gross_lock(dev);
1000 ret = yaffs_file_rd(obj, pg_buf,
1001 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1003 yaffs_gross_unlock(dev);
1009 ClearPageUptodate(pg);
1012 SetPageUptodate(pg);
1016 flush_dcache_page(pg);
1019 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1023 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1025 int ret = yaffs_readpage_nolock(f, pg);
1030 static int yaffs_readpage(struct file *f, struct page *pg)
1034 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1035 ret = yaffs_readpage_unlock(f, pg);
1036 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1040 /* writepage inspired by/stolen from smbfs */
1042 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1043 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1045 static int yaffs_writepage(struct page *page)
1048 struct yaffs_dev *dev;
1049 struct address_space *mapping = page->mapping;
1050 struct inode *inode;
1051 unsigned long end_index;
1053 struct yaffs_obj *obj;
1060 inode = mapping->host;
1063 i_size = i_size_read(inode);
1065 end_index = i_size >> PAGE_CACHE_SHIFT;
1067 if (page->index < end_index)
1068 n_bytes = PAGE_CACHE_SIZE;
1070 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1072 if (page->index > end_index || !n_bytes) {
1073 yaffs_trace(YAFFS_TRACE_OS,
1074 "yaffs_writepage at %08x, inode size = %08x!!",
1075 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1076 (unsigned)inode->i_size);
1077 yaffs_trace(YAFFS_TRACE_OS,
1078 " -> don't care!!");
1080 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1081 set_page_writeback(page);
1083 end_page_writeback(page);
1088 if (n_bytes != PAGE_CACHE_SIZE)
1089 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1093 buffer = kmap(page);
1095 obj = yaffs_inode_to_obj(inode);
1097 yaffs_gross_lock(dev);
1099 yaffs_trace(YAFFS_TRACE_OS,
1100 "yaffs_writepage at %08x, size %08x",
1101 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1102 yaffs_trace(YAFFS_TRACE_OS,
1103 "writepag0: obj = %05x, ino = %05x",
1104 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1106 n_written = yaffs_wr_file(obj, buffer,
1107 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1109 yaffs_touch_super(dev);
1111 yaffs_trace(YAFFS_TRACE_OS,
1112 "writepag1: obj = %05x, ino = %05x",
1113 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1115 yaffs_gross_unlock(dev);
1118 set_page_writeback(page);
1120 end_page_writeback(page);
1123 return (n_written == n_bytes) ? 0 : -ENOSPC;
1126 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1127 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1128 loff_t pos, unsigned len, unsigned flags,
1129 struct page **pagep, void **fsdata)
1131 struct page *pg = NULL;
1132 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1138 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1139 pg = grab_cache_page_write_begin(mapping, index, flags);
1141 pg = __grab_cache_page(mapping, index);
1149 yaffs_trace(YAFFS_TRACE_OS,
1150 "start yaffs_write_begin index %d(%x) uptodate %d",
1151 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
1154 space_held = yaffs_hold_space(filp);
1161 /* Update page if required */
1163 if (!Page_Uptodate(pg))
1164 ret = yaffs_readpage_nolock(filp, pg);
1169 /* Happy path return */
1170 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1175 yaffs_trace(YAFFS_TRACE_OS,
1176 "end yaffs_write_begin fail returning %d", ret);
1178 yaffs_release_space(filp);
1181 page_cache_release(pg);
1188 static int yaffs_prepare_write(struct file *f, struct page *pg,
1189 unsigned offset, unsigned to)
1191 yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
1193 if (!Page_Uptodate(pg))
1194 return yaffs_readpage_nolock(f, pg);
1199 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1200 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1201 loff_t pos, unsigned len, unsigned copied,
1202 struct page *pg, void *fsdadata)
1206 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1209 addr = kva + offset_into_page;
1211 yaffs_trace(YAFFS_TRACE_OS,
1212 "yaffs_write_end addr %p pos %x n_bytes %d",
1213 addr, (unsigned)pos, copied);
1215 ret = yaffs_file_write(filp, addr, copied, &pos);
1217 if (ret != copied) {
1218 yaffs_trace(YAFFS_TRACE_OS,
1219 "yaffs_write_end not same size ret %d copied %d",
1226 yaffs_release_space(filp);
1228 page_cache_release(pg);
1233 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1238 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1239 int n_bytes = to - offset;
1242 unsigned spos = pos;
1246 addr = kva + offset;
1248 saddr = (unsigned)addr;
1250 yaffs_trace(YAFFS_TRACE_OS,
1251 "yaffs_commit_write addr %x pos %x n_bytes %d",
1252 saddr, spos, n_bytes);
1254 n_written = yaffs_file_write(f, addr, n_bytes, &pos);
1256 if (n_written != n_bytes) {
1257 yaffs_trace(YAFFS_TRACE_OS,
1258 "yaffs_commit_write not same size n_written %d n_bytes %d",
1259 n_written, n_bytes);
1264 yaffs_trace(YAFFS_TRACE_OS,
1265 "yaffs_commit_write returning %d",
1266 n_written == n_bytes ? 0 : n_written);
1268 return n_written == n_bytes ? 0 : n_written;
1272 static void yaffs_fill_inode_from_obj(struct inode *inode,
1273 struct yaffs_obj *obj)
1277 /* Check mode against the variant type and attempt to repair if broken. */
1278 u32 mode = obj->yst_mode;
1279 switch (obj->variant_type) {
1280 case YAFFS_OBJECT_TYPE_FILE:
1281 if (!S_ISREG(mode)) {
1282 obj->yst_mode &= ~S_IFMT;
1283 obj->yst_mode |= S_IFREG;
1287 case YAFFS_OBJECT_TYPE_SYMLINK:
1288 if (!S_ISLNK(mode)) {
1289 obj->yst_mode &= ~S_IFMT;
1290 obj->yst_mode |= S_IFLNK;
1294 case YAFFS_OBJECT_TYPE_DIRECTORY:
1295 if (!S_ISDIR(mode)) {
1296 obj->yst_mode &= ~S_IFMT;
1297 obj->yst_mode |= S_IFDIR;
1301 case YAFFS_OBJECT_TYPE_UNKNOWN:
1302 case YAFFS_OBJECT_TYPE_HARDLINK:
1303 case YAFFS_OBJECT_TYPE_SPECIAL:
1309 inode->i_flags |= S_NOATIME;
1311 inode->i_ino = obj->obj_id;
1312 inode->i_mode = obj->yst_mode;
1313 inode->i_uid = obj->yst_uid;
1314 inode->i_gid = obj->yst_gid;
1315 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1316 inode->i_blksize = inode->i_sb->s_blocksize;
1318 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1320 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1321 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1322 inode->i_atime.tv_nsec = 0;
1323 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1324 inode->i_mtime.tv_nsec = 0;
1325 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1326 inode->i_ctime.tv_nsec = 0;
1328 inode->i_rdev = obj->yst_rdev;
1329 inode->i_atime = obj->yst_atime;
1330 inode->i_mtime = obj->yst_mtime;
1331 inode->i_ctime = obj->yst_ctime;
1333 inode->i_size = yaffs_get_obj_length(obj);
1334 inode->i_blocks = (inode->i_size + 511) >> 9;
1336 inode->i_nlink = yaffs_get_obj_link_count(obj);
1338 yaffs_trace(YAFFS_TRACE_OS,
1339 "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1340 inode->i_mode, inode->i_uid, inode->i_gid,
1341 (int)inode->i_size, atomic_read(&inode->i_count));
1343 switch (obj->yst_mode & S_IFMT) {
1344 default: /* fifo, device or socket */
1345 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1346 init_special_inode(inode, obj->yst_mode,
1347 old_decode_dev(obj->yst_rdev));
1349 init_special_inode(inode, obj->yst_mode,
1350 (dev_t) (obj->yst_rdev));
1353 case S_IFREG: /* file */
1354 inode->i_op = &yaffs_file_inode_operations;
1355 inode->i_fop = &yaffs_file_operations;
1356 inode->i_mapping->a_ops =
1357 &yaffs_file_address_operations;
1359 case S_IFDIR: /* directory */
1360 inode->i_op = &yaffs_dir_inode_operations;
1361 inode->i_fop = &yaffs_dir_operations;
1363 case S_IFLNK: /* symlink */
1364 inode->i_op = &yaffs_symlink_inode_operations;
1368 yaffs_inode_to_obj_lv(inode) = obj;
1370 obj->my_inode = inode;
1373 yaffs_trace(YAFFS_TRACE_OS,
1374 "yaffs_fill_inode invalid parameters");
1379 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1380 struct yaffs_obj *obj)
1382 struct inode *inode;
1385 yaffs_trace(YAFFS_TRACE_OS,
1386 "yaffs_get_inode for NULL super_block!!");
1392 yaffs_trace(YAFFS_TRACE_OS,
1393 "yaffs_get_inode for NULL object!!");
1398 yaffs_trace(YAFFS_TRACE_OS,
1399 "yaffs_get_inode for object %d", obj->obj_id);
1401 inode = Y_IGET(sb, obj->obj_id);
1405 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1406 /* iget also increments the inode's i_count */
1407 /* NB You can't be holding gross_lock or deadlock will happen! */
1412 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1415 struct yaffs_obj *obj;
1416 int n_written, ipos;
1417 struct inode *inode;
1418 struct yaffs_dev *dev;
1420 obj = yaffs_dentry_to_obj(f->f_dentry);
1423 yaffs_trace(YAFFS_TRACE_OS,
1424 "yaffs_file_write: hey obj is null!");
1430 yaffs_gross_lock(dev);
1432 inode = f->f_dentry->d_inode;
1434 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1435 ipos = inode->i_size;
1439 yaffs_trace(YAFFS_TRACE_OS,
1440 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1441 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1443 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1445 yaffs_touch_super(dev);
1447 yaffs_trace(YAFFS_TRACE_OS,
1448 "yaffs_file_write: %d(%x) bytes written",
1449 (unsigned)n, (unsigned)n);
1451 if (n_written > 0) {
1454 if (ipos > inode->i_size) {
1455 inode->i_size = ipos;
1456 inode->i_blocks = (ipos + 511) >> 9;
1458 yaffs_trace(YAFFS_TRACE_OS,
1459 "yaffs_file_write size updated to %d bytes, %d blocks",
1460 ipos, (int)(inode->i_blocks));
1464 yaffs_gross_unlock(dev);
1465 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1468 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1469 /* For now we just assume few parallel writes and check against a small number. */
1470 /* Todo: need to do this with a counter to handle parallel reads better */
1472 static ssize_t yaffs_hold_space(struct file *f)
1474 struct yaffs_obj *obj;
1475 struct yaffs_dev *dev;
1479 obj = yaffs_dentry_to_obj(f->f_dentry);
1483 yaffs_gross_lock(dev);
1485 n_free_chunks = yaffs_get_n_free_chunks(dev);
1487 yaffs_gross_unlock(dev);
1489 return (n_free_chunks > 20) ? 1 : 0;
1492 static void yaffs_release_space(struct file *f)
1494 struct yaffs_obj *obj;
1495 struct yaffs_dev *dev;
1497 obj = yaffs_dentry_to_obj(f->f_dentry);
1501 yaffs_gross_lock(dev);
1503 yaffs_gross_unlock(dev);
1506 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1508 struct yaffs_obj *obj;
1509 struct yaffs_dev *dev;
1510 struct yaffs_search_context *sc;
1511 struct inode *inode = f->f_dentry->d_inode;
1512 unsigned long offset, curoffs;
1513 struct yaffs_obj *l;
1516 char name[YAFFS_MAX_NAME_LENGTH + 1];
1518 obj = yaffs_dentry_to_obj(f->f_dentry);
1521 yaffs_gross_lock(dev);
1523 yaffs_dev_to_lc(dev)->readdir_process = current;
1527 sc = yaffs_new_search(obj);
1533 yaffs_trace(YAFFS_TRACE_OS,
1534 "yaffs_readdir: starting at %d", (int)offset);
1537 yaffs_trace(YAFFS_TRACE_OS,
1538 "yaffs_readdir: entry . ino %d",
1540 yaffs_gross_unlock(dev);
1541 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1542 yaffs_gross_lock(dev);
1545 yaffs_gross_lock(dev);
1550 yaffs_trace(YAFFS_TRACE_OS,
1551 "yaffs_readdir: entry .. ino %d",
1552 (int)f->f_dentry->d_parent->d_inode->i_ino);
1553 yaffs_gross_unlock(dev);
1554 if (filldir(dirent, "..", 2, offset,
1555 f->f_dentry->d_parent->d_inode->i_ino,
1557 yaffs_gross_lock(dev);
1560 yaffs_gross_lock(dev);
1567 /* If the directory has changed since the open or last call to
1568 readdir, rewind to after the 2 canned entries. */
1569 if (f->f_version != inode->i_version) {
1572 f->f_version = inode->i_version;
1575 while (sc->next_return) {
1577 l = sc->next_return;
1578 if (curoffs >= offset) {
1579 int this_inode = yaffs_get_obj_inode(l);
1580 int this_type = yaffs_get_obj_type(l);
1582 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1583 yaffs_trace(YAFFS_TRACE_OS,
1584 "yaffs_readdir: %s inode %d",
1585 name, yaffs_get_obj_inode(l));
1587 yaffs_gross_unlock(dev);
1592 offset, this_inode, this_type) < 0) {
1593 yaffs_gross_lock(dev);
1597 yaffs_gross_lock(dev);
1602 yaffs_search_advance(sc);
1606 yaffs_search_end(sc);
1607 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1608 yaffs_gross_unlock(dev);
1614 * File creation. Allocate an inode, and we're done..
1617 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1620 #define YCRED(x) (x->cred)
1623 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1624 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1627 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1631 struct inode *inode;
1633 struct yaffs_obj *obj = NULL;
1634 struct yaffs_dev *dev;
1636 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1638 int error = -ENOSPC;
1639 uid_t uid = YCRED(current)->fsuid;
1641 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1643 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1647 yaffs_trace(YAFFS_TRACE_OS,
1648 "yaffs_mknod: parent object %d type %d",
1649 parent->obj_id, parent->variant_type);
1651 yaffs_trace(YAFFS_TRACE_OS,
1652 "yaffs_mknod: could not get parent object");
1656 yaffs_trace(YAFFS_TRACE_OS,
1657 "yaffs_mknod: making oject for %s, mode %x dev %x",
1658 dentry->d_name.name, mode, rdev);
1660 dev = parent->my_dev;
1662 yaffs_gross_lock(dev);
1664 switch (mode & S_IFMT) {
1666 /* Special (socket, fifo, device...) */
1667 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
1668 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1670 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1671 gid, old_encode_dev(rdev));
1674 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1678 case S_IFREG: /* file */
1679 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
1680 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1683 case S_IFDIR: /* directory */
1684 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
1685 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1688 case S_IFLNK: /* symlink */
1689 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
1690 obj = NULL; /* Do we ever get here? */
1694 /* Can not call yaffs_get_inode() with gross lock held */
1695 yaffs_gross_unlock(dev);
1698 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1699 d_instantiate(dentry, inode);
1700 update_dir_time(dir);
1701 yaffs_trace(YAFFS_TRACE_OS,
1702 "yaffs_mknod created object %d count = %d",
1703 obj->obj_id, atomic_read(&inode->i_count));
1705 yaffs_fill_inode_from_obj(dir, parent);
1707 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
1714 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1717 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
1718 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1722 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1723 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1724 struct nameidata *n)
1726 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1729 yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
1730 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1733 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1737 struct yaffs_dev *dev;
1738 struct yaffs_obj *obj;
1740 yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
1741 (int)(dir->i_ino), dentry->d_name.name);
1742 obj = yaffs_inode_to_obj(dir);
1745 yaffs_gross_lock(dev);
1747 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1749 if (ret_val == YAFFS_OK) {
1750 dentry->d_inode->i_nlink--;
1752 yaffs_gross_unlock(dev);
1753 mark_inode_dirty(dentry->d_inode);
1754 update_dir_time(dir);
1757 yaffs_gross_unlock(dev);
1764 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1765 struct dentry *dentry)
1767 struct inode *inode = old_dentry->d_inode;
1768 struct yaffs_obj *obj = NULL;
1769 struct yaffs_obj *link = NULL;
1770 struct yaffs_dev *dev;
1772 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
1774 obj = yaffs_inode_to_obj(inode);
1777 yaffs_gross_lock(dev);
1779 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1781 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1785 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1786 d_instantiate(dentry, old_dentry->d_inode);
1787 atomic_inc(&old_dentry->d_inode->i_count);
1788 yaffs_trace(YAFFS_TRACE_OS,
1789 "yaffs_link link count %d i_count %d",
1790 old_dentry->d_inode->i_nlink,
1791 atomic_read(&old_dentry->d_inode->i_count));
1794 yaffs_gross_unlock(dev);
1797 update_dir_time(dir);
1804 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1805 const char *symname)
1807 struct yaffs_obj *obj;
1808 struct yaffs_dev *dev;
1809 uid_t uid = YCRED(current)->fsuid;
1811 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1813 yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
1815 dev = yaffs_inode_to_obj(dir)->my_dev;
1816 yaffs_gross_lock(dev);
1817 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1818 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1819 yaffs_gross_unlock(dev);
1822 struct inode *inode;
1824 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1825 d_instantiate(dentry, inode);
1826 update_dir_time(dir);
1827 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
1830 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
1836 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1837 static int yaffs_sync_object(struct file *file, int datasync)
1839 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1844 struct yaffs_obj *obj;
1845 struct yaffs_dev *dev;
1846 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1847 struct dentry *dentry = file->f_path.dentry;
1850 obj = yaffs_dentry_to_obj(dentry);
1854 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1855 "yaffs_sync_object");
1856 yaffs_gross_lock(dev);
1857 yaffs_flush_file(obj, 1, datasync);
1858 yaffs_gross_unlock(dev);
1863 * The VFS layer already does all the dentry stuff for rename.
1865 * NB: POSIX says you can rename an object over an old object of the same name
1867 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1868 struct inode *new_dir, struct dentry *new_dentry)
1870 struct yaffs_dev *dev;
1871 int ret_val = YAFFS_FAIL;
1872 struct yaffs_obj *target;
1874 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
1875 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1877 yaffs_gross_lock(dev);
1879 /* Check if the target is an existing directory that is not empty. */
1880 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1881 new_dentry->d_name.name);
1883 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1884 !list_empty(&target->variant.dir_variant.children)) {
1886 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
1888 ret_val = YAFFS_FAIL;
1890 /* Now does unlinking internally using shadowing mechanism */
1891 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
1893 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1894 old_dentry->d_name.name,
1895 yaffs_inode_to_obj(new_dir),
1896 new_dentry->d_name.name);
1898 yaffs_gross_unlock(dev);
1900 if (ret_val == YAFFS_OK) {
1902 new_dentry->d_inode->i_nlink--;
1903 mark_inode_dirty(new_dentry->d_inode);
1906 update_dir_time(old_dir);
1907 if (old_dir != new_dir)
1908 update_dir_time(new_dir);
1915 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1917 struct inode *inode = dentry->d_inode;
1919 struct yaffs_dev *dev;
1921 yaffs_trace(YAFFS_TRACE_OS,
1922 "yaffs_setattr of object %d",
1923 yaffs_inode_to_obj(inode)->obj_id);
1925 /* Fail if a requested resize >= 2GB */
1926 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
1930 error = inode_change_ok(inode, attr);
1934 error = yaffs_vfs_setattr(inode, attr);
1935 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
1936 if (attr->ia_valid & ATTR_SIZE) {
1937 yaffs_vfs_setsize(inode, attr->ia_size);
1938 inode->i_blocks = (inode->i_size + 511) >> 9;
1941 dev = yaffs_inode_to_obj(inode)->my_dev;
1942 if (attr->ia_valid & ATTR_SIZE) {
1943 yaffs_trace(YAFFS_TRACE_OS,
1945 (int)(attr->ia_size),
1946 (int)(attr->ia_size));
1948 yaffs_gross_lock(dev);
1949 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1950 if (result == YAFFS_OK) {
1955 yaffs_gross_unlock(dev);
1959 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
1964 #ifdef CONFIG_YAFFS_XATTR
1965 static int yaffs_setxattr(struct dentry *dentry, const char *name,
1966 const void *value, size_t size, int flags)
1968 struct inode *inode = dentry->d_inode;
1970 struct yaffs_dev *dev;
1971 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1973 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
1978 yaffs_gross_lock(dev);
1979 result = yaffs_set_xattrib(obj, name, value, size, flags);
1980 if (result == YAFFS_OK)
1982 else if (result < 0)
1984 yaffs_gross_unlock(dev);
1987 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
1992 static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
1993 void *buff, size_t size)
1995 struct inode *inode = dentry->d_inode;
1997 struct yaffs_dev *dev;
1998 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2000 yaffs_trace(YAFFS_TRACE_OS,
2001 "yaffs_getxattr \"%s\" from object %d",
2006 yaffs_gross_lock(dev);
2007 error = yaffs_get_xattrib(obj, name, buff, size);
2008 yaffs_gross_unlock(dev);
2011 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
2016 static int yaffs_removexattr(struct dentry *dentry, const char *name)
2018 struct inode *inode = dentry->d_inode;
2020 struct yaffs_dev *dev;
2021 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2023 yaffs_trace(YAFFS_TRACE_OS,
2024 "yaffs_removexattr of object %d", obj->obj_id);
2029 yaffs_gross_lock(dev);
2030 result = yaffs_remove_xattrib(obj, name);
2031 if (result == YAFFS_OK)
2033 else if (result < 0)
2035 yaffs_gross_unlock(dev);
2038 yaffs_trace(YAFFS_TRACE_OS,
2039 "yaffs_removexattr done returning %d", error);
2044 static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
2046 struct inode *inode = dentry->d_inode;
2048 struct yaffs_dev *dev;
2049 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2051 yaffs_trace(YAFFS_TRACE_OS,
2052 "yaffs_listxattr of object %d", obj->obj_id);
2056 yaffs_gross_lock(dev);
2057 error = yaffs_list_xattrib(obj, buff, size);
2058 yaffs_gross_unlock(dev);
2061 yaffs_trace(YAFFS_TRACE_OS,
2062 "yaffs_listxattr done returning %d", error);
2069 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2070 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2072 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2073 struct super_block *sb = dentry->d_sb;
2074 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2075 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2077 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2079 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2081 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2084 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
2086 yaffs_gross_lock(dev);
2088 buf->f_type = YAFFS_MAGIC;
2089 buf->f_bsize = sb->s_blocksize;
2090 buf->f_namelen = 255;
2092 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2093 /* Do this if chunk size is not a power of 2 */
2095 uint64_t bytes_in_dev;
2096 uint64_t bytes_free;
2100 ((dev->param.end_block - dev->param.start_block +
2101 1))) * ((uint64_t) (dev->param.chunks_per_block *
2102 dev->data_bytes_per_chunk));
2104 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
2105 buf->f_blocks = bytes_in_dev;
2107 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2108 ((uint64_t) (dev->data_bytes_per_chunk));
2110 do_div(bytes_free, sb->s_blocksize);
2112 buf->f_bfree = bytes_free;
2114 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2117 (dev->param.end_block - dev->param.start_block + 1) *
2118 dev->param.chunks_per_block /
2119 (sb->s_blocksize / dev->data_bytes_per_chunk);
2121 yaffs_get_n_free_chunks(dev) /
2122 (sb->s_blocksize / dev->data_bytes_per_chunk);
2125 (dev->param.end_block - dev->param.start_block + 1) *
2126 dev->param.chunks_per_block *
2127 (dev->data_bytes_per_chunk / sb->s_blocksize);
2130 yaffs_get_n_free_chunks(dev) *
2131 (dev->data_bytes_per_chunk / sb->s_blocksize);
2136 buf->f_bavail = buf->f_bfree;
2138 yaffs_gross_unlock(dev);
2142 static void yaffs_flush_inodes(struct super_block *sb)
2145 struct yaffs_obj *obj;
2147 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2148 obj = yaffs_inode_to_obj(iptr);
2150 yaffs_trace(YAFFS_TRACE_OS,
2153 yaffs_flush_file(obj, 1, 0);
2158 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2160 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2164 yaffs_flush_inodes(sb);
2165 yaffs_update_dirty_dirs(dev);
2166 yaffs_flush_whole_cache(dev);
2168 yaffs_checkpoint_save(dev);
2171 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
2173 unsigned erased_chunks =
2174 dev->n_erased_blocks * dev->param.chunks_per_block;
2175 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2176 unsigned scattered = 0; /* Free chunks not in an erased block */
2178 if (erased_chunks < dev->n_free_chunks)
2179 scattered = (dev->n_free_chunks - erased_chunks);
2181 if (!context->bg_running)
2183 else if (scattered < (dev->param.chunks_per_block * 2))
2185 else if (erased_chunks > dev->n_free_chunks / 2)
2187 else if (erased_chunks > dev->n_free_chunks / 4)
2193 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2196 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2197 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2198 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2201 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2202 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
2204 sb->s_dirt ? "dirty" : "clean",
2205 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2206 oneshot_checkpoint ? " one-shot" : "");
2208 yaffs_gross_lock(dev);
2209 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2210 oneshot_checkpoint) && !dev->is_checkpointed;
2212 if (sb->s_dirt || do_checkpoint) {
2213 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2215 if (oneshot_checkpoint)
2216 yaffs_auto_checkpoint &= ~4;
2218 yaffs_gross_unlock(dev);
2224 * yaffs background thread functions .
2225 * yaffs_bg_thread_fn() the thread function
2226 * yaffs_bg_start() launches the background thread.
2227 * yaffs_bg_stop() cleans up the background thread.
2230 * The thread should only run after the yaffs is initialised
2231 * The thread should be stopped before yaffs is unmounted.
2232 * The thread should not do any writing while the fs is in read only.
2235 #ifdef YAFFS_COMPILE_BACKGROUND
2237 void yaffs_background_waker(unsigned long data)
2239 wake_up_process((struct task_struct *)data);
2242 static int yaffs_bg_thread_fn(void *data)
2244 struct yaffs_dev *dev = (struct yaffs_dev *)data;
2245 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2246 unsigned long now = jiffies;
2247 unsigned long next_dir_update = now;
2248 unsigned long next_gc = now;
2249 unsigned long expires;
2250 unsigned int urgency;
2253 struct timer_list timer;
2255 yaffs_trace(YAFFS_TRACE_BACKGROUND,
2256 "yaffs_background starting for dev %p", (void *)dev);
2258 #ifdef YAFFS_COMPILE_FREEZER
2261 while (context->bg_running) {
2262 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
2264 if (kthread_should_stop())
2267 #ifdef YAFFS_COMPILE_FREEZER
2268 if (try_to_freeze())
2271 yaffs_gross_lock(dev);
2275 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
2276 yaffs_update_dirty_dirs(dev);
2277 next_dir_update = now + HZ;
2280 if (time_after(now, next_gc) && yaffs_bg_enable) {
2281 if (!dev->is_checkpointed) {
2282 urgency = yaffs_bg_gc_urgency(dev);
2283 gc_result = yaffs_bg_gc(dev, urgency);
2285 next_gc = now + HZ / 20 + 1;
2286 else if (urgency > 0)
2287 next_gc = now + HZ / 10 + 1;
2289 next_gc = now + HZ * 2;
2292 * gc not running so set to next_dir_update
2293 * to cut down on wake ups
2295 next_gc = next_dir_update;
2298 yaffs_gross_unlock(dev);
2300 expires = next_dir_update;
2301 if (time_before(next_gc, expires))
2303 if (time_before(expires, now))
2306 Y_INIT_TIMER(&timer);
2307 timer.expires = expires + 1;
2308 timer.data = (unsigned long)current;
2309 timer.function = yaffs_background_waker;
2311 set_current_state(TASK_INTERRUPTIBLE);
2314 del_timer_sync(&timer);
2323 static int yaffs_bg_start(struct yaffs_dev *dev)
2326 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2331 context->bg_running = 1;
2333 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2334 (void *)dev, "yaffs-bg-%d",
2337 if (IS_ERR(context->bg_thread)) {
2338 retval = PTR_ERR(context->bg_thread);
2339 context->bg_thread = NULL;
2340 context->bg_running = 0;
2345 static void yaffs_bg_stop(struct yaffs_dev *dev)
2347 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2349 ctxt->bg_running = 0;
2351 if (ctxt->bg_thread) {
2352 kthread_stop(ctxt->bg_thread);
2353 ctxt->bg_thread = NULL;
2357 static int yaffs_bg_thread_fn(void *data)
2362 static int yaffs_bg_start(struct yaffs_dev *dev)
2367 static void yaffs_bg_stop(struct yaffs_dev *dev)
2372 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2373 static void yaffs_write_super(struct super_block *sb)
2375 static int yaffs_write_super(struct super_block *sb)
2378 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2380 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2381 "yaffs_write_super %s",
2382 request_checkpoint ? " checkpt" : "");
2384 yaffs_do_sync_fs(sb, request_checkpoint);
2386 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2391 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2392 static int yaffs_sync_fs(struct super_block *sb, int wait)
2394 static int yaffs_sync_fs(struct super_block *sb)
2397 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2399 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2400 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
2402 yaffs_do_sync_fs(sb, request_checkpoint);
2407 #ifdef YAFFS_USE_OWN_IGET
2409 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2411 struct inode *inode;
2412 struct yaffs_obj *obj;
2413 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2415 yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
2417 inode = iget_locked(sb, ino);
2419 return ERR_PTR(-ENOMEM);
2420 if (!(inode->i_state & I_NEW))
2423 /* NB This is called as a side effect of other functions, but
2424 * we had to release the lock to prevent deadlocks, so
2425 * need to lock again.
2428 yaffs_gross_lock(dev);
2430 obj = yaffs_find_by_number(dev, inode->i_ino);
2432 yaffs_fill_inode_from_obj(inode, obj);
2434 yaffs_gross_unlock(dev);
2436 unlock_new_inode(inode);
2442 static void yaffs_read_inode(struct inode *inode)
2444 /* NB This is called as a side effect of other functions, but
2445 * we had to release the lock to prevent deadlocks, so
2446 * need to lock again.
2449 struct yaffs_obj *obj;
2450 struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
2452 yaffs_trace(YAFFS_TRACE_OS,
2453 "yaffs_read_inode for %d", (int)inode->i_ino);
2455 if (current != yaffs_dev_to_lc(dev)->readdir_process)
2456 yaffs_gross_lock(dev);
2458 obj = yaffs_find_by_number(dev, inode->i_ino);
2460 yaffs_fill_inode_from_obj(inode, obj);
2462 if (current != yaffs_dev_to_lc(dev)->readdir_process)
2463 yaffs_gross_unlock(dev);
2468 static LIST_HEAD(yaffs_context_list);
2469 struct mutex yaffs_context_lock;
2471 static void yaffs_put_super(struct super_block *sb)
2473 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2475 yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
2477 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2478 "Shutting down yaffs background thread");
2480 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2481 "yaffs background thread shut down");
2483 yaffs_gross_lock(dev);
2485 yaffs_flush_super(sb, 1);
2487 if (yaffs_dev_to_lc(dev)->put_super_fn)
2488 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2490 yaffs_deinitialise(dev);
2492 yaffs_gross_unlock(dev);
2494 mutex_lock(&yaffs_context_lock);
2495 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2496 mutex_unlock(&yaffs_context_lock);
2498 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2499 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
2500 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2506 static void yaffs_mtd_put_super(struct super_block *sb)
2508 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2513 put_mtd_device(mtd);
2516 static void yaffs_touch_super(struct yaffs_dev *dev)
2518 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2520 yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
2525 struct yaffs_options {
2527 int skip_checkpoint_read;
2528 int skip_checkpoint_write;
2531 int tags_ecc_overridden;
2532 int lazy_loading_enabled;
2533 int lazy_loading_overridden;
2534 int empty_lost_and_found;
2535 int empty_lost_and_found_overridden;
2538 #define MAX_OPT_LEN 30
2539 static int yaffs_parse_options(struct yaffs_options *options,
2540 const char *options_str)
2542 char cur_opt[MAX_OPT_LEN + 1];
2546 /* Parse through the options which is a comma seperated list */
2548 while (options_str && *options_str && !error) {
2549 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2552 while (*options_str == ',')
2555 while (*options_str && *options_str != ',') {
2556 if (p < MAX_OPT_LEN) {
2557 cur_opt[p] = *options_str;
2563 if (!strcmp(cur_opt, "inband-tags")) {
2564 options->inband_tags = 1;
2565 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2566 options->tags_ecc_on = 0;
2567 options->tags_ecc_overridden = 1;
2568 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2569 options->tags_ecc_on = 1;
2570 options->tags_ecc_overridden = 1;
2571 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2572 options->lazy_loading_enabled = 0;
2573 options->lazy_loading_overridden = 1;
2574 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2575 options->lazy_loading_enabled = 1;
2576 options->lazy_loading_overridden = 1;
2577 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2578 options->empty_lost_and_found = 0;
2579 options->empty_lost_and_found_overridden = 1;
2580 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2581 options->empty_lost_and_found = 1;
2582 options->empty_lost_and_found_overridden = 1;
2583 } else if (!strcmp(cur_opt, "no-cache")) {
2584 options->no_cache = 1;
2585 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2586 options->skip_checkpoint_read = 1;
2587 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2588 options->skip_checkpoint_write = 1;
2589 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2590 options->skip_checkpoint_read = 1;
2591 options->skip_checkpoint_write = 1;
2593 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2602 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2603 struct super_block *sb,
2604 void *data, int silent)
2607 struct inode *inode = NULL;
2608 struct dentry *root;
2609 struct yaffs_dev *dev = 0;
2610 char devname_buf[BDEVNAME_SIZE + 1];
2611 struct mtd_info *mtd;
2613 char *data_str = (char *)data;
2614 struct yaffs_linux_context *context = NULL;
2615 struct yaffs_param *param;
2619 struct yaffs_options options;
2623 struct yaffs_linux_context *context_iterator;
2624 struct list_head *l;
2627 printk(KERN_INFO "yaffs: sb is NULL\n");
2631 sb->s_magic = YAFFS_MAGIC;
2632 sb->s_op = &yaffs_super_ops;
2633 sb->s_flags |= MS_NOATIME;
2635 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2637 #ifdef YAFFS_COMPILE_EXPORTFS
2638 sb->s_export_op = &yaffs_export_ops;
2642 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2643 else if (!yaffs_devname(sb, devname_buf))
2644 printk(KERN_INFO "yaffs: devname is NULL\n");
2646 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2648 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2653 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2655 memset(&options, 0, sizeof(options));
2657 if (yaffs_parse_options(&options, data_str)) {
2658 /* Option parsing failed */
2662 sb->s_blocksize = PAGE_CACHE_SIZE;
2663 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2665 yaffs_trace(YAFFS_TRACE_OS,
2666 "yaffs_read_super: Using yaffs%d", yaffs_version);
2667 yaffs_trace(YAFFS_TRACE_OS,
2668 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2670 yaffs_trace(YAFFS_TRACE_ALWAYS,
2671 "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
2672 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2673 yaffs_devname(sb, devname_buf));
2675 /* Check it's an mtd device..... */
2676 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2677 return NULL; /* This isn't an mtd device */
2679 /* Get the device */
2680 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2682 yaffs_trace(YAFFS_TRACE_ALWAYS,
2683 "yaffs: MTD device #%u doesn't appear to exist",
2687 /* Check it's NAND */
2688 if (mtd->type != MTD_NANDFLASH) {
2689 yaffs_trace(YAFFS_TRACE_ALWAYS,
2690 "yaffs: MTD device is not NAND it's type %d",
2695 yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2696 yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2697 yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2698 yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2699 yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2700 yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2701 yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2702 yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
2703 yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2704 yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2705 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2706 yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
2708 yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2711 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2713 if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2714 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2718 /* Added NCB 26/5/2006 for completeness */
2719 if (yaffs_version == 2 && !options.inband_tags
2720 && WRITE_SIZE(mtd) == 512) {
2721 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2726 if (yaffs_version == 2) {
2727 /* Check for version 2 style functions */
2729 !mtd->block_isbad ||
2730 !mtd->block_markbad || !mtd->read || !mtd->write ||
2731 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2732 !mtd->read_oob || !mtd->write_oob) {
2735 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2737 yaffs_trace(YAFFS_TRACE_ALWAYS,
2738 "MTD device does not support required functions"
2743 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2744 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2745 !options.inband_tags) {
2746 yaffs_trace(YAFFS_TRACE_ALWAYS,
2747 "MTD device does not have the right page sizes"
2752 /* Check for V1 style functions */
2753 if (!mtd->erase || !mtd->read || !mtd->write ||
2754 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2755 !mtd->read_oob || !mtd->write_oob) {
2758 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2760 yaffs_trace(YAFFS_TRACE_ALWAYS,
2761 "MTD device does not support required functions"
2766 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2767 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2768 yaffs_trace(YAFFS_TRACE_ALWAYS,
2769 "MTD device does not support have the right page sizes"
2775 /* OK, so if we got here, we have an MTD that's NAND and looks
2776 * like it has the right capabilities
2777 * Set the struct yaffs_dev up for mtd
2780 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2783 "yaffs: mtd is read only, setting superblock read only\n"
2785 sb->s_flags |= MS_RDONLY;
2788 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2789 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2791 if (!dev || !context) {
2801 /* Deep shit could not allocate device structure */
2802 yaffs_trace(YAFFS_TRACE_ALWAYS,
2803 "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
2807 memset(dev, 0, sizeof(struct yaffs_dev));
2808 param = &(dev->param);
2810 memset(context, 0, sizeof(struct yaffs_linux_context));
2811 dev->os_context = context;
2812 INIT_LIST_HEAD(&(context->context_list));
2814 context->super = sb;
2816 dev->read_only = read_only;
2818 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2819 sb->s_fs_info = dev;
2821 sb->u.generic_sbp = dev;
2824 dev->driver_context = mtd;
2825 param->name = mtd->name;
2827 /* Set up the memory size parameters.... */
2830 YCALCBLOCKS(mtd->size,
2831 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2833 param->start_block = 0;
2834 param->end_block = n_blocks - 1;
2835 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2836 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2837 param->n_reserved_blocks = 5;
2838 param->n_caches = (options.no_cache) ? 0 : 10;
2839 param->inband_tags = options.inband_tags;
2841 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2842 param->disable_lazy_load = 1;
2844 #ifdef CONFIG_YAFFS_XATTR
2845 param->enable_xattr = 1;
2847 if (options.lazy_loading_overridden)
2848 param->disable_lazy_load = !options.lazy_loading_enabled;
2850 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2851 param->no_tags_ecc = 1;
2854 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2856 param->defered_dir_update = 1;
2859 if (options.tags_ecc_overridden)
2860 param->no_tags_ecc = !options.tags_ecc_on;
2862 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2863 param->empty_lost_n_found = 1;
2866 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2867 param->refresh_period = 0;
2869 param->refresh_period = 500;
2872 #ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
2873 param->always_check_erased = 1;
2876 if (options.empty_lost_and_found_overridden)
2877 param->empty_lost_n_found = options.empty_lost_and_found;
2879 /* ... and the functions. */
2880 if (yaffs_version == 2) {
2881 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2882 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2883 param->bad_block_fn = nandmtd2_mark_block_bad;
2884 param->query_block_fn = nandmtd2_query_block;
2885 yaffs_dev_to_lc(dev)->spare_buffer =
2886 kmalloc(mtd->oobsize, GFP_NOFS);
2887 param->is_yaffs2 = 1;
2888 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2889 param->total_bytes_per_chunk = mtd->writesize;
2890 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2892 param->total_bytes_per_chunk = mtd->oobblock;
2893 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2895 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2897 param->start_block = 0;
2898 param->end_block = n_blocks - 1;
2900 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2901 /* use the MTD interface in yaffs_mtdif1.c */
2902 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2903 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2904 param->bad_block_fn = nandmtd1_mark_block_bad;
2905 param->query_block_fn = nandmtd1_query_block;
2907 param->write_chunk_fn = nandmtd_write_chunk;
2908 param->read_chunk_fn = nandmtd_read_chunk;
2910 param->is_yaffs2 = 0;
2912 /* ... and common functions */
2913 param->erase_fn = nandmtd_erase_block;
2914 param->initialise_flash_fn = nandmtd_initialise;
2916 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2918 param->sb_dirty_fn = yaffs_touch_super;
2919 param->gc_control = yaffs_gc_control_callback;
2921 yaffs_dev_to_lc(dev)->super = sb;
2923 #ifndef CONFIG_YAFFS_DOES_ECC
2924 param->use_nand_ecc = 1;
2927 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2928 param->wide_tnodes_disabled = 1;
2931 param->skip_checkpt_rd = options.skip_checkpoint_read;
2932 param->skip_checkpt_wr = options.skip_checkpoint_write;
2934 mutex_lock(&yaffs_context_lock);
2935 /* Get a mount id */
2937 for (mount_id = 0; !found; mount_id++) {
2939 list_for_each(l, &yaffs_context_list) {
2941 list_entry(l, struct yaffs_linux_context,
2943 if (context_iterator->mount_id == mount_id)
2947 context->mount_id = mount_id;
2949 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2950 &yaffs_context_list);
2951 mutex_unlock(&yaffs_context_lock);
2953 /* Directory search handling... */
2954 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2955 param->remove_obj_fn = yaffs_remove_obj_callback;
2957 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2959 yaffs_gross_lock(dev);
2961 err = yaffs_guts_initialise(dev);
2963 yaffs_trace(YAFFS_TRACE_OS,
2964 "yaffs_read_super: guts initialised %s",
2965 (err == YAFFS_OK) ? "OK" : "FAILED");
2967 if (err == YAFFS_OK)
2968 yaffs_bg_start(dev);
2970 if (!context->bg_thread)
2971 param->defered_dir_update = 0;
2973 /* Release lock before yaffs_get_inode() */
2974 yaffs_gross_unlock(dev);
2976 /* Create root inode */
2977 if (err == YAFFS_OK)
2978 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2983 inode->i_op = &yaffs_dir_inode_operations;
2984 inode->i_fop = &yaffs_dir_operations;
2986 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2988 root = d_alloc_root(inode);
2990 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2997 sb->s_dirt = !dev->is_checkpointed;
2998 yaffs_trace(YAFFS_TRACE_ALWAYS,
2999 "yaffs_read_super: is_checkpointed %d",
3000 dev->is_checkpointed);
3002 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
3006 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3007 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3010 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3013 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3014 static int yaffs_read_super(struct file_system_type *fs,
3015 int flags, const char *dev_name,
3016 void *data, struct vfsmount *mnt)
3019 return get_sb_bdev(fs, flags, dev_name, data,
3020 yaffs_internal_read_super_mtd, mnt);
3023 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3024 int flags, const char *dev_name,
3028 return get_sb_bdev(fs, flags, dev_name, data,
3029 yaffs_internal_read_super_mtd);
3033 static struct file_system_type yaffs_fs_type = {
3034 .owner = THIS_MODULE,
3036 .get_sb = yaffs_read_super,
3037 .kill_sb = kill_block_super,
3038 .fs_flags = FS_REQUIRES_DEV,
3041 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3044 return yaffs_internal_read_super(1, sb, data, silent);
3047 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3051 #ifdef CONFIG_YAFFS_YAFFS2
3053 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3054 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3057 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3060 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3061 static int yaffs2_read_super(struct file_system_type *fs,
3062 int flags, const char *dev_name, void *data,
3063 struct vfsmount *mnt)
3065 return get_sb_bdev(fs, flags, dev_name, data,
3066 yaffs2_internal_read_super_mtd, mnt);
3069 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3070 int flags, const char *dev_name,
3074 return get_sb_bdev(fs, flags, dev_name, data,
3075 yaffs2_internal_read_super_mtd);
3079 static struct file_system_type yaffs2_fs_type = {
3080 .owner = THIS_MODULE,
3082 .get_sb = yaffs2_read_super,
3083 .kill_sb = kill_block_super,
3084 .fs_flags = FS_REQUIRES_DEV,
3087 static struct super_block *yaffs2_read_super(struct super_block *sb,
3088 void *data, int silent)
3090 return yaffs_internal_read_super(2, sb, data, silent);
3093 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3097 #endif /* CONFIG_YAFFS_YAFFS2 */
3099 static struct proc_dir_entry *my_proc_entry;
3101 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3103 struct yaffs_param *param = &dev->param;
3105 buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
3106 buf += sprintf(buf, "end_block............ %d\n", param->end_block);
3107 buf += sprintf(buf, "total_bytes_per_chunk %d\n",
3108 param->total_bytes_per_chunk);
3109 buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
3110 buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
3111 buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
3112 buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
3113 buf += sprintf(buf, "empty_lost_n_found... %d\n",
3114 param->empty_lost_n_found);
3115 buf += sprintf(buf, "disable_lazy_load.... %d\n",
3116 param->disable_lazy_load);
3117 buf += sprintf(buf, "refresh_period....... %d\n",
3118 param->refresh_period);
3119 buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
3120 buf += sprintf(buf, "n_reserved_blocks.... %d\n",
3121 param->n_reserved_blocks);
3122 buf += sprintf(buf, "always_check_erased.. %d\n",
3123 param->always_check_erased);
3124 buf += sprintf(buf, "\n");
3129 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3131 buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
3132 dev->data_bytes_per_chunk);
3133 buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3134 buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3135 buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3136 buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
3137 dev->blocks_in_checkpt);
3138 buf += sprintf(buf, "\n");
3139 buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3140 buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3141 buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3142 buf += sprintf(buf, "\n");
3143 buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3144 buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3145 buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3146 buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3147 buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3148 buf += sprintf(buf, "passive_gc_count..... %u\n",
3149 dev->passive_gc_count);
3150 buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
3151 dev->oldest_dirty_gc_count);
3152 buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3153 buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3154 buf += sprintf(buf, "n_retired_writes..... %u\n",
3155 dev->n_retired_writes);
3156 buf += sprintf(buf, "n_retired_blocks..... %u\n",
3157 dev->n_retired_blocks);
3158 buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3159 buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3160 buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
3161 dev->n_tags_ecc_fixed);
3162 buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
3163 dev->n_tags_ecc_unfixed);
3164 buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3165 buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3166 buf += sprintf(buf, "n_unlinked_files..... %u\n",
3167 dev->n_unlinked_files);
3168 buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3169 buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3174 static int yaffs_proc_read(char *page,
3176 off_t offset, int count, int *eof, void *data)
3178 struct list_head *item;
3183 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3184 * We use 'offset' (*ppos) to indicate where we are in dev_list.
3185 * This also assumes the user has posted a read buffer large
3186 * enough to hold the complete output; but that's life in /proc.
3191 /* Print header first */
3195 "Multi-version YAFFS built:" __DATE__ " " __TIME__
3198 buf += sprintf(buf, "\n");
3202 mutex_lock(&yaffs_context_lock);
3204 /* Locate and print the Nth entry. Order N-squared but N is small. */
3205 list_for_each(item, &yaffs_context_list) {
3206 struct yaffs_linux_context *dc =
3207 list_entry(item, struct yaffs_linux_context,
3209 struct yaffs_dev *dev = dc->dev;
3211 if (n < (step & ~1)) {
3215 if ((step & 1) == 0) {
3217 sprintf(buf, "\nDevice %d \"%s\"\n", n,
3219 buf = yaffs_dump_dev_part0(buf, dev);
3221 buf = yaffs_dump_dev_part1(buf, dev);
3226 mutex_unlock(&yaffs_context_lock);
3229 return buf - page < count ? buf - page : count;
3233 * Set the verbosity of the warnings and error messages.
3235 * Note that the names can only be a..z or _ with the current code.
3240 unsigned mask_bitfield;
3242 {"allocate", YAFFS_TRACE_ALLOCATE},
3243 {"always", YAFFS_TRACE_ALWAYS},
3244 {"background", YAFFS_TRACE_BACKGROUND},
3245 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3246 {"buffers", YAFFS_TRACE_BUFFERS},
3247 {"bug", YAFFS_TRACE_BUG},
3248 {"checkpt", YAFFS_TRACE_CHECKPOINT},
3249 {"deletion", YAFFS_TRACE_DELETION},
3250 {"erase", YAFFS_TRACE_ERASE},
3251 {"error", YAFFS_TRACE_ERROR},
3252 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3253 {"gc", YAFFS_TRACE_GC},
3254 {"lock", YAFFS_TRACE_LOCK},
3255 {"mtd", YAFFS_TRACE_MTD},
3256 {"nandaccess", YAFFS_TRACE_NANDACCESS},
3257 {"os", YAFFS_TRACE_OS},
3258 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3259 {"scan", YAFFS_TRACE_SCAN},
3260 {"mount", YAFFS_TRACE_MOUNT},
3261 {"tracing", YAFFS_TRACE_TRACING},
3262 {"sync", YAFFS_TRACE_SYNC},
3263 {"write", YAFFS_TRACE_WRITE},
3264 {"verify", YAFFS_TRACE_VERIFY},
3265 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3266 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3267 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3268 {"all", 0xffffffff},
3273 #define MAX_MASK_NAME_LENGTH 40
3274 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3275 unsigned long count, void *data)
3277 unsigned rg = 0, mask_bitfield;
3281 char substring[MAX_MASK_NAME_LENGTH + 1];
3287 rg = yaffs_trace_mask;
3289 while (!done && (pos < count)) {
3291 while ((pos < count) && isspace(buf[pos]))
3308 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3310 if (end > buf + pos) {
3311 mask_name = "numeral";
3312 len = end - (buf + pos);
3316 for (x = buf + pos, i = 0;
3317 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3318 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3320 substring[i] = '\0';
3322 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3323 if (strcmp(substring, mask_flags[i].mask_name)
3325 mask_name = mask_flags[i].mask_name;
3327 mask_flags[i].mask_bitfield;
3334 if (mask_name != NULL) {
3338 rg &= ~mask_bitfield;
3341 rg |= mask_bitfield;
3347 rg |= mask_bitfield;
3353 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3355 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3357 if (rg & YAFFS_TRACE_ALWAYS) {
3358 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3360 flag = ((rg & mask_flags[i].mask_bitfield) ==
3361 mask_flags[i].mask_bitfield) ? '+' : '-';
3362 printk(KERN_DEBUG "%c%s\n", flag,
3363 mask_flags[i].mask_name);
3370 static int yaffs_proc_write(struct file *file, const char *buf,
3371 unsigned long count, void *data)
3373 return yaffs_proc_write_trace_options(file, buf, count, data);
3376 /* Stuff to handle installation of file systems */
3377 struct file_system_to_install {
3378 struct file_system_type *fst;
3382 static struct file_system_to_install fs_to_install[] = {
3383 {&yaffs_fs_type, 0},
3384 {&yaffs2_fs_type, 0},
3388 static int __init init_yaffs_fs(void)
3391 struct file_system_to_install *fsinst;
3393 yaffs_trace(YAFFS_TRACE_ALWAYS,
3394 "yaffs built " __DATE__ " " __TIME__ " Installing.");
3396 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
3397 yaffs_trace(YAFFS_TRACE_ALWAYS,
3398 " \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n"
3402 mutex_init(&yaffs_context_lock);
3404 /* Install the proc_fs entries */
3405 my_proc_entry = create_proc_entry("yaffs",
3406 S_IRUGO | S_IFREG, YPROC_ROOT);
3408 if (my_proc_entry) {
3409 my_proc_entry->write_proc = yaffs_proc_write;
3410 my_proc_entry->read_proc = yaffs_proc_read;
3411 my_proc_entry->data = NULL;
3416 /* Now add the file system entries */
3418 fsinst = fs_to_install;
3420 while (fsinst->fst && !error) {
3421 error = register_filesystem(fsinst->fst);
3423 fsinst->installed = 1;
3427 /* Any errors? uninstall */
3429 fsinst = fs_to_install;
3431 while (fsinst->fst) {
3432 if (fsinst->installed) {
3433 unregister_filesystem(fsinst->fst);
3434 fsinst->installed = 0;
3443 static void __exit exit_yaffs_fs(void)
3446 struct file_system_to_install *fsinst;
3448 yaffs_trace(YAFFS_TRACE_ALWAYS,
3449 "yaffs built " __DATE__ " " __TIME__ " removing.");
3451 remove_proc_entry("yaffs", YPROC_ROOT);
3453 fsinst = fs_to_install;
3455 while (fsinst->fst) {
3456 if (fsinst->installed) {
3457 unregister_filesystem(fsinst->fst);
3458 fsinst->installed = 0;
3464 module_init(init_yaffs_fs)
3465 module_exit(exit_yaffs_fs)
3467 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3468 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3469 MODULE_LICENSE("GPL");