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 int yaffs_setxattr(struct dentry *dentry, const char *name,
311 const void *value, size_t size, int flags);
312 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
314 int yaffs_removexattr(struct dentry *dentry, const char *name);
315 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 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
511 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
512 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
515 static void yaffs_gross_unlock(struct yaffs_dev *dev)
517 T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), 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 YMALLOC(sizeof(struct yaffs_search_context));
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) {
696 sc = list_entry(i, struct yaffs_search_context, others);
697 if (sc->next_return == obj)
698 yaffs_search_advance(sc);
704 /*-----------------------------------------------------------------*/
706 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
709 unsigned char *alias;
712 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
714 yaffs_gross_lock(dev);
716 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
718 yaffs_gross_unlock(dev);
723 ret = vfs_readlink(dentry, buffer, buflen, alias);
728 #if (YAFFS_NEW_FOLLOW_LINK == 1)
729 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
733 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
737 unsigned char *alias;
739 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
741 yaffs_gross_lock(dev);
743 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
744 yaffs_gross_unlock(dev);
750 #if (YAFFS_NEW_FOLLOW_LINK == 1)
751 nd_set_link(nd, alias);
755 ret = ERR_PTR(ret_int);
758 ret = vfs_follow_link(nd, alias);
767 #if (YAFFS_NEW_FOLLOW_LINK == 1)
768 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
774 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
775 struct yaffs_obj *obj);
778 * Lookup is used to find objects in the fs
780 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
782 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
785 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
788 struct yaffs_obj *obj;
789 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
791 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
793 if (current != yaffs_dev_to_lc(dev)->readdir_process)
794 yaffs_gross_lock(dev);
797 (TSTR("yaffs_lookup for %d:%s\n"),
798 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name));
800 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
802 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
804 /* Can't hold gross lock when calling yaffs_get_inode() */
805 if (current != yaffs_dev_to_lc(dev)->readdir_process)
806 yaffs_gross_unlock(dev);
810 (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
812 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
815 T(YAFFS_TRACE_OS, (TSTR("yaffs_loookup dentry \n")));
816 /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
817 * d_add even if NULL inode */
819 /*dget(dentry); // try to solve directory bug */
820 d_add(dentry, inode);
828 T(YAFFS_TRACE_OS, (TSTR("yaffs_lookup not found\n")));
832 /* added NCB for 2.5/6 compatability - forces add even if inode is
833 * NULL which creates dentry hash */
834 d_add(dentry, inode);
839 #ifdef YAFFS_HAS_PUT_INODE
841 /* For now put inode is just for debugging
842 * Put inode is called when the inode **structure** is put.
844 static void yaffs_put_inode(struct inode *inode)
847 (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
848 atomic_read(&inode->i_count)));
853 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
855 /* Clear the association between the inode and
856 * the struct yaffs_obj.
858 obj->my_inode = NULL;
859 yaffs_inode_to_obj_lv(inode) = NULL;
861 /* If the object freeing was deferred, then the real
863 * This should fix the inode inconsistency problem.
865 yaffs_handle_defered_free(obj);
868 #ifdef YAFFS_HAS_EVICT_INODE
869 /* yaffs_evict_inode combines into one operation what was previously done in
870 * yaffs_clear_inode() and yaffs_delete_inode()
873 static void yaffs_evict_inode(struct inode *inode)
875 struct yaffs_obj *obj;
876 struct yaffs_dev *dev;
879 obj = yaffs_inode_to_obj(inode);
882 (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
883 atomic_read(&inode->i_count),
884 obj ? "object exists" : "null object"));
886 if (!inode->i_nlink && !is_bad_inode(inode))
888 truncate_inode_pages(&inode->i_data, 0);
889 end_writeback(inode);
891 if (deleteme && obj) {
893 yaffs_gross_lock(dev);
895 yaffs_gross_unlock(dev);
899 yaffs_gross_lock(dev);
900 yaffs_unstitch_obj(inode, obj);
901 yaffs_gross_unlock(dev);
907 /* clear is called to tell the fs to release any per-inode data it holds.
908 * The object might still exist on disk and is just being thrown out of the cache
909 * or else the object has actually been deleted and we're being called via
911 * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
914 static void yaffs_clear_inode(struct inode *inode)
916 struct yaffs_obj *obj;
917 struct yaffs_dev *dev;
919 obj = yaffs_inode_to_obj(inode);
922 (TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
923 atomic_read(&inode->i_count),
924 obj ? "object exists" : "null object"));
928 yaffs_gross_lock(dev);
929 yaffs_unstitch_obj(inode, obj);
930 yaffs_gross_unlock(dev);
935 /* delete is called when the link count is zero and the inode
936 * is put (ie. nobody wants to know about it anymore, time to
938 * NB Must call clear_inode()
940 static void yaffs_delete_inode(struct inode *inode)
942 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
943 struct yaffs_dev *dev;
946 (TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
947 atomic_read(&inode->i_count),
948 obj ? "object exists" : "null object"));
952 yaffs_gross_lock(dev);
954 yaffs_gross_unlock(dev);
956 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
957 truncate_inode_pages(&inode->i_data, 0);
963 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
964 static int yaffs_file_flush(struct file *file, fl_owner_t id)
966 static int yaffs_file_flush(struct file *file)
969 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
971 struct yaffs_dev *dev = obj->my_dev;
974 (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
975 obj->dirty ? "dirty" : "clean"));
977 yaffs_gross_lock(dev);
979 yaffs_flush_file(obj, 1, 0);
981 yaffs_gross_unlock(dev);
986 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
988 /* Lifted from jffs2 */
990 struct yaffs_obj *obj;
991 unsigned char *pg_buf;
994 struct yaffs_dev *dev;
997 (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
998 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
999 (unsigned)PAGE_CACHE_SIZE));
1001 obj = yaffs_dentry_to_obj(f->f_dentry);
1005 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1006 BUG_ON(!PageLocked(pg));
1008 if (!PageLocked(pg))
1013 /* FIXME: Can kmap fail? */
1015 yaffs_gross_lock(dev);
1017 ret = yaffs_file_rd(obj, pg_buf,
1018 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1020 yaffs_gross_unlock(dev);
1026 ClearPageUptodate(pg);
1029 SetPageUptodate(pg);
1033 flush_dcache_page(pg);
1036 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
1040 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1042 int ret = yaffs_readpage_nolock(f, pg);
1047 static int yaffs_readpage(struct file *f, struct page *pg)
1051 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
1052 ret = yaffs_readpage_unlock(f, pg);
1053 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
1057 /* writepage inspired by/stolen from smbfs */
1059 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1060 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1062 static int yaffs_writepage(struct page *page)
1065 struct yaffs_dev *dev;
1066 struct address_space *mapping = page->mapping;
1067 struct inode *inode;
1068 unsigned long end_index;
1070 struct yaffs_obj *obj;
1077 inode = mapping->host;
1080 i_size = i_size_read(inode);
1082 end_index = i_size >> PAGE_CACHE_SHIFT;
1084 if (page->index < end_index)
1085 n_bytes = PAGE_CACHE_SIZE;
1087 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1089 if (page->index > end_index || !n_bytes) {
1092 ("yaffs_writepage at %08x, inode size = %08x!!!\n"),
1093 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1094 (unsigned)inode->i_size));
1096 (TSTR(" -> don't care!!\n")));
1098 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1099 set_page_writeback(page);
1101 end_page_writeback(page);
1106 if (n_bytes != PAGE_CACHE_SIZE)
1107 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1111 buffer = kmap(page);
1113 obj = yaffs_inode_to_obj(inode);
1115 yaffs_gross_lock(dev);
1118 (TSTR("yaffs_writepage at %08x, size %08x\n"),
1119 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
1121 (TSTR("writepag0: obj = %05x, ino = %05x\n"),
1122 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1124 n_written = yaffs_wr_file(obj, buffer,
1125 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1127 yaffs_touch_super(dev);
1130 (TSTR("writepag1: obj = %05x, ino = %05x\n"),
1131 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
1133 yaffs_gross_unlock(dev);
1136 set_page_writeback(page);
1138 end_page_writeback(page);
1141 return (n_written == n_bytes) ? 0 : -ENOSPC;
1144 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1145 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1146 loff_t pos, unsigned len, unsigned flags,
1147 struct page **pagep, void **fsdata)
1149 struct page *pg = NULL;
1150 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1156 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
1157 pg = grab_cache_page_write_begin(mapping, index, flags);
1159 pg = __grab_cache_page(mapping, index);
1168 (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
1169 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0));
1172 space_held = yaffs_hold_space(filp);
1179 /* Update page if required */
1181 if (!Page_Uptodate(pg))
1182 ret = yaffs_readpage_nolock(filp, pg);
1187 /* Happy path return */
1188 T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
1194 (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
1196 yaffs_release_space(filp);
1199 page_cache_release(pg);
1206 static int yaffs_prepare_write(struct file *f, struct page *pg,
1207 unsigned offset, unsigned to)
1209 T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
1211 if (!Page_Uptodate(pg))
1212 return yaffs_readpage_nolock(f, pg);
1217 #if (YAFFS_USE_WRITE_BEGIN_END > 0)
1218 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1219 loff_t pos, unsigned len, unsigned copied,
1220 struct page *pg, void *fsdadata)
1224 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1227 addr = kva + offset_into_page;
1230 ("yaffs_write_end addr %p pos %x n_bytes %d\n",
1231 addr, (unsigned)pos, copied));
1233 ret = yaffs_file_write(filp, addr, copied, &pos);
1235 if (ret != copied) {
1237 (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
1246 yaffs_release_space(filp);
1248 page_cache_release(pg);
1253 static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
1258 loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
1259 int n_bytes = to - offset;
1262 unsigned spos = pos;
1266 addr = kva + offset;
1268 saddr = (unsigned)addr;
1271 (TSTR("yaffs_commit_write addr %x pos %x n_bytes %d\n"),
1272 saddr, spos, n_bytes));
1274 n_written = yaffs_file_write(f, addr, n_bytes, &pos);
1276 if (n_written != n_bytes) {
1279 ("yaffs_commit_write not same size n_written %d n_bytes %d\n"),
1280 n_written, n_bytes));
1289 (TSTR("yaffs_commit_write returning %d\n"),
1290 n_written == n_bytes ? 0 : n_written));
1292 return n_written == n_bytes ? 0 : n_written;
1296 static void yaffs_fill_inode_from_obj(struct inode *inode,
1297 struct yaffs_obj *obj)
1301 /* Check mode against the variant type and attempt to repair if broken. */
1302 u32 mode = obj->yst_mode;
1303 switch (obj->variant_type) {
1304 case YAFFS_OBJECT_TYPE_FILE:
1305 if (!S_ISREG(mode)) {
1306 obj->yst_mode &= ~S_IFMT;
1307 obj->yst_mode |= S_IFREG;
1311 case YAFFS_OBJECT_TYPE_SYMLINK:
1312 if (!S_ISLNK(mode)) {
1313 obj->yst_mode &= ~S_IFMT;
1314 obj->yst_mode |= S_IFLNK;
1318 case YAFFS_OBJECT_TYPE_DIRECTORY:
1319 if (!S_ISDIR(mode)) {
1320 obj->yst_mode &= ~S_IFMT;
1321 obj->yst_mode |= S_IFDIR;
1325 case YAFFS_OBJECT_TYPE_UNKNOWN:
1326 case YAFFS_OBJECT_TYPE_HARDLINK:
1327 case YAFFS_OBJECT_TYPE_SPECIAL:
1333 inode->i_flags |= S_NOATIME;
1335 inode->i_ino = obj->obj_id;
1336 inode->i_mode = obj->yst_mode;
1337 inode->i_uid = obj->yst_uid;
1338 inode->i_gid = obj->yst_gid;
1339 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
1340 inode->i_blksize = inode->i_sb->s_blocksize;
1342 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1344 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1345 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1346 inode->i_atime.tv_nsec = 0;
1347 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1348 inode->i_mtime.tv_nsec = 0;
1349 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1350 inode->i_ctime.tv_nsec = 0;
1352 inode->i_rdev = obj->yst_rdev;
1353 inode->i_atime = obj->yst_atime;
1354 inode->i_mtime = obj->yst_mtime;
1355 inode->i_ctime = obj->yst_ctime;
1357 inode->i_size = yaffs_get_obj_length(obj);
1358 inode->i_blocks = (inode->i_size + 511) >> 9;
1360 inode->i_nlink = yaffs_get_obj_link_count(obj);
1364 ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
1365 inode->i_mode, inode->i_uid, inode->i_gid,
1366 (int)inode->i_size, atomic_read(&inode->i_count)));
1368 switch (obj->yst_mode & S_IFMT) {
1369 default: /* fifo, device or socket */
1370 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1371 init_special_inode(inode, obj->yst_mode,
1372 old_decode_dev(obj->yst_rdev));
1374 init_special_inode(inode, obj->yst_mode,
1375 (dev_t) (obj->yst_rdev));
1378 case S_IFREG: /* file */
1379 inode->i_op = &yaffs_file_inode_operations;
1380 inode->i_fop = &yaffs_file_operations;
1381 inode->i_mapping->a_ops =
1382 &yaffs_file_address_operations;
1384 case S_IFDIR: /* directory */
1385 inode->i_op = &yaffs_dir_inode_operations;
1386 inode->i_fop = &yaffs_dir_operations;
1388 case S_IFLNK: /* symlink */
1389 inode->i_op = &yaffs_symlink_inode_operations;
1393 yaffs_inode_to_obj_lv(inode) = obj;
1395 obj->my_inode = inode;
1399 (TSTR("yaffs_fill_inode invalid parameters\n")));
1404 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1405 struct yaffs_obj *obj)
1407 struct inode *inode;
1411 (TSTR("yaffs_get_inode for NULL super_block!!\n")));
1418 (TSTR("yaffs_get_inode for NULL object!!\n")));
1424 (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
1426 inode = Y_IGET(sb, obj->obj_id);
1430 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1431 /* iget also increments the inode's i_count */
1432 /* NB You can't be holding gross_lock or deadlock will happen! */
1437 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1440 struct yaffs_obj *obj;
1441 int n_written, ipos;
1442 struct inode *inode;
1443 struct yaffs_dev *dev;
1445 obj = yaffs_dentry_to_obj(f->f_dentry);
1449 yaffs_gross_lock(dev);
1451 inode = f->f_dentry->d_inode;
1453 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1454 ipos = inode->i_size;
1460 (TSTR("yaffs_file_write: hey obj is null!\n")));
1463 (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
1464 "to object %d at %d(%x)\n"),
1465 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos));
1467 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1469 yaffs_touch_super(dev);
1472 (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
1473 (unsigned)n, (unsigned)n));
1475 if (n_written > 0) {
1478 if (ipos > inode->i_size) {
1479 inode->i_size = ipos;
1480 inode->i_blocks = (ipos + 511) >> 9;
1483 (TSTR("yaffs_file_write size updated to %d bytes, "
1484 "%d blocks\n"), ipos, (int)(inode->i_blocks)));
1488 yaffs_gross_unlock(dev);
1489 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1492 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1493 /* For now we just assume few parallel writes and check against a small number. */
1494 /* Todo: need to do this with a counter to handle parallel reads better */
1496 static ssize_t yaffs_hold_space(struct file *f)
1498 struct yaffs_obj *obj;
1499 struct yaffs_dev *dev;
1503 obj = yaffs_dentry_to_obj(f->f_dentry);
1507 yaffs_gross_lock(dev);
1509 n_free_chunks = yaffs_get_n_free_chunks(dev);
1511 yaffs_gross_unlock(dev);
1513 return (n_free_chunks > 20) ? 1 : 0;
1516 static void yaffs_release_space(struct file *f)
1518 struct yaffs_obj *obj;
1519 struct yaffs_dev *dev;
1521 obj = yaffs_dentry_to_obj(f->f_dentry);
1525 yaffs_gross_lock(dev);
1527 yaffs_gross_unlock(dev);
1530 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1532 struct yaffs_obj *obj;
1533 struct yaffs_dev *dev;
1534 struct yaffs_search_context *sc;
1535 struct inode *inode = f->f_dentry->d_inode;
1536 unsigned long offset, curoffs;
1537 struct yaffs_obj *l;
1540 char name[YAFFS_MAX_NAME_LENGTH + 1];
1542 obj = yaffs_dentry_to_obj(f->f_dentry);
1545 yaffs_gross_lock(dev);
1547 yaffs_dev_to_lc(dev)->readdir_process = current;
1551 sc = yaffs_new_search(obj);
1558 (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
1562 (TSTR("yaffs_readdir: entry . ino %d \n"),
1563 (int)inode->i_ino));
1564 yaffs_gross_unlock(dev);
1565 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1566 yaffs_gross_lock(dev);
1569 yaffs_gross_lock(dev);
1575 (TSTR("yaffs_readdir: entry .. ino %d \n"),
1576 (int)f->f_dentry->d_parent->d_inode->i_ino));
1577 yaffs_gross_unlock(dev);
1578 if (filldir(dirent, "..", 2, offset,
1579 f->f_dentry->d_parent->d_inode->i_ino,
1581 yaffs_gross_lock(dev);
1584 yaffs_gross_lock(dev);
1591 /* If the directory has changed since the open or last call to
1592 readdir, rewind to after the 2 canned entries. */
1593 if (f->f_version != inode->i_version) {
1596 f->f_version = inode->i_version;
1599 while (sc->next_return) {
1601 l = sc->next_return;
1602 if (curoffs >= offset) {
1603 int this_inode = yaffs_get_obj_inode(l);
1604 int this_type = yaffs_get_obj_type(l);
1606 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1608 (TSTR("yaffs_readdir: %s inode %d\n"),
1609 name, yaffs_get_obj_inode(l)));
1611 yaffs_gross_unlock(dev);
1616 offset, this_inode, this_type) < 0) {
1617 yaffs_gross_lock(dev);
1621 yaffs_gross_lock(dev);
1626 yaffs_search_advance(sc);
1630 yaffs_search_end(sc);
1631 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1632 yaffs_gross_unlock(dev);
1638 * File creation. Allocate an inode, and we're done..
1641 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
1644 #define YCRED(x) (x->cred)
1647 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1648 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1651 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1655 struct inode *inode;
1657 struct yaffs_obj *obj = NULL;
1658 struct yaffs_dev *dev;
1660 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1662 int error = -ENOSPC;
1663 uid_t uid = YCRED(current)->fsuid;
1665 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1667 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1672 (TSTR("yaffs_mknod: parent object %d type %d\n"),
1673 parent->obj_id, parent->variant_type));
1676 (TSTR("yaffs_mknod: could not get parent object\n")));
1680 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
1681 "mode %x dev %x\n"),
1682 dentry->d_name.name, mode, rdev));
1684 dev = parent->my_dev;
1686 yaffs_gross_lock(dev);
1688 switch (mode & S_IFMT) {
1690 /* Special (socket, fifo, device...) */
1691 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
1692 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1694 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1695 gid, old_encode_dev(rdev));
1698 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1702 case S_IFREG: /* file */
1703 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
1704 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1707 case S_IFDIR: /* directory */
1708 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n")));
1709 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1712 case S_IFLNK: /* symlink */
1713 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
1714 obj = NULL; /* Do we ever get here? */
1718 /* Can not call yaffs_get_inode() with gross lock held */
1719 yaffs_gross_unlock(dev);
1722 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1723 d_instantiate(dentry, inode);
1724 update_dir_time(dir);
1726 (TSTR("yaffs_mknod created object %d count = %d\n"),
1727 obj->obj_id, atomic_read(&inode->i_count)));
1729 yaffs_fill_inode_from_obj(dir, parent);
1731 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n")));
1738 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1741 T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
1742 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1746 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
1747 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1748 struct nameidata *n)
1750 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
1753 T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n")));
1754 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1757 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1761 struct yaffs_dev *dev;
1762 struct yaffs_obj *obj;
1765 (TSTR("yaffs_unlink %d:%s\n"),
1766 (int)(dir->i_ino), dentry->d_name.name));
1767 obj = yaffs_inode_to_obj(dir);
1770 yaffs_gross_lock(dev);
1772 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1774 if (ret_val == YAFFS_OK) {
1775 dentry->d_inode->i_nlink--;
1777 yaffs_gross_unlock(dev);
1778 mark_inode_dirty(dentry->d_inode);
1779 update_dir_time(dir);
1782 yaffs_gross_unlock(dev);
1789 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1790 struct dentry *dentry)
1792 struct inode *inode = old_dentry->d_inode;
1793 struct yaffs_obj *obj = NULL;
1794 struct yaffs_obj *link = NULL;
1795 struct yaffs_dev *dev;
1797 T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
1799 obj = yaffs_inode_to_obj(inode);
1802 yaffs_gross_lock(dev);
1804 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1806 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1810 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1811 d_instantiate(dentry, old_dentry->d_inode);
1812 atomic_inc(&old_dentry->d_inode->i_count);
1814 (TSTR("yaffs_link link count %d i_count %d\n"),
1815 old_dentry->d_inode->i_nlink,
1816 atomic_read(&old_dentry->d_inode->i_count)));
1819 yaffs_gross_unlock(dev);
1822 update_dir_time(dir);
1829 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1830 const char *symname)
1832 struct yaffs_obj *obj;
1833 struct yaffs_dev *dev;
1834 uid_t uid = YCRED(current)->fsuid;
1836 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1838 T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
1840 dev = yaffs_inode_to_obj(dir)->my_dev;
1841 yaffs_gross_lock(dev);
1842 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1843 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1844 yaffs_gross_unlock(dev);
1847 struct inode *inode;
1849 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1850 d_instantiate(dentry, inode);
1851 update_dir_time(dir);
1852 T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
1855 T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
1861 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1862 static int yaffs_sync_object(struct file *file, int datasync)
1864 static int yaffs_sync_object(struct file *file, struct dentry *dentry,
1869 struct yaffs_obj *obj;
1870 struct yaffs_dev *dev;
1871 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
1872 struct dentry *dentry = file->f_path.dentry;
1875 obj = yaffs_dentry_to_obj(dentry);
1879 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n")));
1880 yaffs_gross_lock(dev);
1881 yaffs_flush_file(obj, 1, datasync);
1882 yaffs_gross_unlock(dev);
1887 * The VFS layer already does all the dentry stuff for rename.
1889 * NB: POSIX says you can rename an object over an old object of the same name
1891 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1892 struct inode *new_dir, struct dentry *new_dentry)
1894 struct yaffs_dev *dev;
1895 int ret_val = YAFFS_FAIL;
1896 struct yaffs_obj *target;
1898 T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
1899 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1901 yaffs_gross_lock(dev);
1903 /* Check if the target is an existing directory that is not empty. */
1904 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1905 new_dentry->d_name.name);
1907 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1908 !list_empty(&target->variant.dir_variant.children)) {
1910 T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
1912 ret_val = YAFFS_FAIL;
1914 /* Now does unlinking internally using shadowing mechanism */
1915 T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
1917 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1918 old_dentry->d_name.name,
1919 yaffs_inode_to_obj(new_dir),
1920 new_dentry->d_name.name);
1922 yaffs_gross_unlock(dev);
1924 if (ret_val == YAFFS_OK) {
1926 new_dentry->d_inode->i_nlink--;
1927 mark_inode_dirty(new_dentry->d_inode);
1930 update_dir_time(old_dir);
1931 if (old_dir != new_dir)
1932 update_dir_time(new_dir);
1939 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1941 struct inode *inode = dentry->d_inode;
1943 struct yaffs_dev *dev;
1946 (TSTR("yaffs_setattr of object %d\n"),
1947 yaffs_inode_to_obj(inode)->obj_id));
1949 /* Fail if a requested resize >= 2GB */
1950 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
1954 error = inode_change_ok(inode, attr);
1958 error = yaffs_vfs_setattr(inode, attr);
1959 T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n")));
1960 if (attr->ia_valid & ATTR_SIZE) {
1961 yaffs_vfs_setsize(inode, attr->ia_size);
1962 inode->i_blocks = (inode->i_size + 511) >> 9;
1965 dev = yaffs_inode_to_obj(inode)->my_dev;
1966 if (attr->ia_valid & ATTR_SIZE) {
1967 T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"),
1968 (int)(attr->ia_size),
1969 (int)(attr->ia_size)));
1971 yaffs_gross_lock(dev);
1972 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1973 if (result == YAFFS_OK) {
1978 yaffs_gross_unlock(dev);
1982 T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error));
1987 #ifdef CONFIG_YAFFS_XATTR
1988 int yaffs_setxattr(struct dentry *dentry, const char *name,
1989 const void *value, size_t size, int flags)
1991 struct inode *inode = dentry->d_inode;
1993 struct yaffs_dev *dev;
1994 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1996 T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), obj->obj_id));
2001 yaffs_gross_lock(dev);
2002 result = yaffs_set_xattrib(obj, name, value, size, flags);
2003 if (result == YAFFS_OK)
2005 else if (result < 0)
2007 yaffs_gross_unlock(dev);
2010 T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), error));
2015 ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff,
2018 struct inode *inode = dentry->d_inode;
2020 struct yaffs_dev *dev;
2021 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2024 (TSTR("yaffs_getxattr \"%s\" from object %d\n"), name, obj->obj_id));
2028 yaffs_gross_lock(dev);
2029 error = yaffs_get_xattrib(obj, name, buff, size);
2030 yaffs_gross_unlock(dev);
2033 T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), error));
2038 int yaffs_removexattr(struct dentry *dentry, const char *name)
2040 struct inode *inode = dentry->d_inode;
2042 struct yaffs_dev *dev;
2043 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2046 (TSTR("yaffs_removexattr of object %d\n"), obj->obj_id));
2051 yaffs_gross_lock(dev);
2052 result = yaffs_remove_xattrib(obj, name);
2053 if (result == YAFFS_OK)
2055 else if (result < 0)
2057 yaffs_gross_unlock(dev);
2061 (TSTR("yaffs_removexattr done returning %d\n"), error));
2066 ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
2068 struct inode *inode = dentry->d_inode;
2070 struct yaffs_dev *dev;
2071 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
2074 (TSTR("yaffs_listxattr of object %d\n"), obj->obj_id));
2078 yaffs_gross_lock(dev);
2079 error = yaffs_list_xattrib(obj, buff, size);
2080 yaffs_gross_unlock(dev);
2083 T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error));
2090 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2091 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
2093 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
2094 struct super_block *sb = dentry->d_sb;
2095 #elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2096 static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
2098 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2100 static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
2102 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2105 T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
2107 yaffs_gross_lock(dev);
2109 buf->f_type = YAFFS_MAGIC;
2110 buf->f_bsize = sb->s_blocksize;
2111 buf->f_namelen = 255;
2113 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
2114 /* Do this if chunk size is not a power of 2 */
2116 uint64_t bytes_in_dev;
2117 uint64_t bytes_free;
2121 ((dev->param.end_block - dev->param.start_block +
2122 1))) * ((uint64_t) (dev->param.chunks_per_block *
2123 dev->data_bytes_per_chunk));
2125 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
2126 buf->f_blocks = bytes_in_dev;
2128 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
2129 ((uint64_t) (dev->data_bytes_per_chunk));
2131 do_div(bytes_free, sb->s_blocksize);
2133 buf->f_bfree = bytes_free;
2135 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
2138 (dev->param.end_block - dev->param.start_block + 1) *
2139 dev->param.chunks_per_block /
2140 (sb->s_blocksize / dev->data_bytes_per_chunk);
2142 yaffs_get_n_free_chunks(dev) /
2143 (sb->s_blocksize / dev->data_bytes_per_chunk);
2146 (dev->param.end_block - dev->param.start_block + 1) *
2147 dev->param.chunks_per_block *
2148 (dev->data_bytes_per_chunk / sb->s_blocksize);
2151 yaffs_get_n_free_chunks(dev) *
2152 (dev->data_bytes_per_chunk / sb->s_blocksize);
2157 buf->f_bavail = buf->f_bfree;
2159 yaffs_gross_unlock(dev);
2163 static void yaffs_flush_inodes(struct super_block *sb)
2166 struct yaffs_obj *obj;
2168 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
2169 obj = yaffs_inode_to_obj(iptr);
2171 T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
2173 yaffs_flush_file(obj, 1, 0);
2178 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
2180 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2184 yaffs_flush_inodes(sb);
2185 yaffs_update_dirty_dirs(dev);
2186 yaffs_flush_whole_cache(dev);
2188 yaffs_checkpoint_save(dev);
2191 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
2193 unsigned erased_chunks =
2194 dev->n_erased_blocks * dev->param.chunks_per_block;
2195 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2196 unsigned scattered = 0; /* Free chunks not in an erased block */
2198 if (erased_chunks < dev->n_free_chunks)
2199 scattered = (dev->n_free_chunks - erased_chunks);
2201 if (!context->bg_running)
2203 else if (scattered < (dev->param.chunks_per_block * 2))
2205 else if (erased_chunks > dev->n_free_chunks / 2)
2207 else if (erased_chunks > dev->n_free_chunks / 4)
2213 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
2216 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2217 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
2218 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
2221 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2222 (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
2224 sb->s_dirt ? "dirty" : "clean",
2225 request_checkpoint ? "checkpoint requested" : "no checkpoint",
2226 oneshot_checkpoint ? " one-shot" : ""));
2228 yaffs_gross_lock(dev);
2229 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
2230 oneshot_checkpoint) && !dev->is_checkpointed;
2232 if (sb->s_dirt || do_checkpoint) {
2233 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
2235 if (oneshot_checkpoint)
2236 yaffs_auto_checkpoint &= ~4;
2238 yaffs_gross_unlock(dev);
2244 * yaffs background thread functions .
2245 * yaffs_bg_thread_fn() the thread function
2246 * yaffs_bg_start() launches the background thread.
2247 * yaffs_bg_stop() cleans up the background thread.
2250 * The thread should only run after the yaffs is initialised
2251 * The thread should be stopped before yaffs is unmounted.
2252 * The thread should not do any writing while the fs is in read only.
2255 #ifdef YAFFS_COMPILE_BACKGROUND
2257 void yaffs_background_waker(unsigned long data)
2259 wake_up_process((struct task_struct *)data);
2262 static int yaffs_bg_thread_fn(void *data)
2264 struct yaffs_dev *dev = (struct yaffs_dev *)data;
2265 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2266 unsigned long now = jiffies;
2267 unsigned long next_dir_update = now;
2268 unsigned long next_gc = now;
2269 unsigned long expires;
2270 unsigned int urgency;
2273 struct timer_list timer;
2275 T(YAFFS_TRACE_BACKGROUND,
2276 (TSTR("yaffs_background starting for dev %p\n"), (void *)dev));
2278 #ifdef YAFFS_COMPILE_FREEZER
2281 while (context->bg_running) {
2282 T(YAFFS_TRACE_BACKGROUND, (TSTR("yaffs_background\n")));
2284 if (kthread_should_stop())
2287 #ifdef YAFFS_COMPILE_FREEZER
2288 if (try_to_freeze())
2291 yaffs_gross_lock(dev);
2295 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
2296 yaffs_update_dirty_dirs(dev);
2297 next_dir_update = now + HZ;
2300 if (time_after(now, next_gc) && yaffs_bg_enable) {
2301 if (!dev->is_checkpointed) {
2302 urgency = yaffs_bg_gc_urgency(dev);
2303 gc_result = yaffs_bg_gc(dev, urgency);
2305 next_gc = now + HZ / 20 + 1;
2306 else if (urgency > 0)
2307 next_gc = now + HZ / 10 + 1;
2309 next_gc = now + HZ * 2;
2312 * gc not running so set to next_dir_update
2313 * to cut down on wake ups
2315 next_gc = next_dir_update;
2318 yaffs_gross_unlock(dev);
2320 expires = next_dir_update;
2321 if (time_before(next_gc, expires))
2323 if (time_before(expires, now))
2326 Y_INIT_TIMER(&timer);
2327 timer.expires = expires + 1;
2328 timer.data = (unsigned long)current;
2329 timer.function = yaffs_background_waker;
2331 set_current_state(TASK_INTERRUPTIBLE);
2334 del_timer_sync(&timer);
2343 static int yaffs_bg_start(struct yaffs_dev *dev)
2346 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
2351 context->bg_running = 1;
2353 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
2354 (void *)dev, "yaffs-bg-%d",
2357 if (IS_ERR(context->bg_thread)) {
2358 retval = PTR_ERR(context->bg_thread);
2359 context->bg_thread = NULL;
2360 context->bg_running = 0;
2365 static void yaffs_bg_stop(struct yaffs_dev *dev)
2367 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
2369 ctxt->bg_running = 0;
2371 if (ctxt->bg_thread) {
2372 kthread_stop(ctxt->bg_thread);
2373 ctxt->bg_thread = NULL;
2377 static int yaffs_bg_thread_fn(void *data)
2382 static int yaffs_bg_start(struct yaffs_dev *dev)
2387 static void yaffs_bg_stop(struct yaffs_dev *dev)
2392 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2393 static void yaffs_write_super(struct super_block *sb)
2395 static int yaffs_write_super(struct super_block *sb)
2398 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
2400 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
2401 (TSTR("yaffs_write_super%s\n"),
2402 request_checkpoint ? " checkpt" : ""));
2404 yaffs_do_sync_fs(sb, request_checkpoint);
2406 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
2411 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2412 static int yaffs_sync_fs(struct super_block *sb, int wait)
2414 static int yaffs_sync_fs(struct super_block *sb)
2417 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
2419 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
2420 (TSTR("yaffs_sync_fs%s\n"), request_checkpoint ? " checkpt" : ""));
2422 yaffs_do_sync_fs(sb, request_checkpoint);
2427 #ifdef YAFFS_USE_OWN_IGET
2429 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
2431 struct inode *inode;
2432 struct yaffs_obj *obj;
2433 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2435 T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), ino));
2437 inode = iget_locked(sb, ino);
2439 return ERR_PTR(-ENOMEM);
2440 if (!(inode->i_state & I_NEW))
2443 /* NB This is called as a side effect of other functions, but
2444 * we had to release the lock to prevent deadlocks, so
2445 * need to lock again.
2448 yaffs_gross_lock(dev);
2450 obj = yaffs_find_by_number(dev, inode->i_ino);
2452 yaffs_fill_inode_from_obj(inode, obj);
2454 yaffs_gross_unlock(dev);
2456 unlock_new_inode(inode);
2462 static void yaffs_read_inode(struct inode *inode)
2464 /* NB This is called as a side effect of other functions, but
2465 * we had to release the lock to prevent deadlocks, so
2466 * need to lock again.
2469 struct yaffs_obj *obj;
2470 struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
2473 (TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
2475 if (current != yaffs_dev_to_lc(dev)->readdir_process)
2476 yaffs_gross_lock(dev);
2478 obj = yaffs_find_by_number(dev, inode->i_ino);
2480 yaffs_fill_inode_from_obj(inode, obj);
2482 if (current != yaffs_dev_to_lc(dev)->readdir_process)
2483 yaffs_gross_unlock(dev);
2488 static LIST_HEAD(yaffs_context_list);
2489 struct mutex yaffs_context_lock;
2491 static void yaffs_put_super(struct super_block *sb)
2493 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2495 T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
2497 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2498 (TSTR("Shutting down yaffs background thread\n")));
2500 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2501 (TSTR("yaffs background thread shut down\n")));
2503 yaffs_gross_lock(dev);
2505 yaffs_flush_super(sb, 1);
2507 if (yaffs_dev_to_lc(dev)->put_super_fn)
2508 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2510 yaffs_deinitialise(dev);
2512 yaffs_gross_unlock(dev);
2514 mutex_lock(&yaffs_context_lock);
2515 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2516 mutex_unlock(&yaffs_context_lock);
2518 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2519 YFREE(yaffs_dev_to_lc(dev)->spare_buffer);
2520 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2526 static void yaffs_mtd_put_super(struct super_block *sb)
2528 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2533 put_mtd_device(mtd);
2536 static void yaffs_touch_super(struct yaffs_dev *dev)
2538 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2540 T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
2545 struct yaffs_options {
2547 int skip_checkpoint_read;
2548 int skip_checkpoint_write;
2551 int tags_ecc_overridden;
2552 int lazy_loading_enabled;
2553 int lazy_loading_overridden;
2554 int empty_lost_and_found;
2555 int empty_lost_and_found_overridden;
2558 #define MAX_OPT_LEN 30
2559 static int yaffs_parse_options(struct yaffs_options *options,
2560 const char *options_str)
2562 char cur_opt[MAX_OPT_LEN + 1];
2566 /* Parse through the options which is a comma seperated list */
2568 while (options_str && *options_str && !error) {
2569 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2572 while (*options_str == ',')
2575 while (*options_str && *options_str != ',') {
2576 if (p < MAX_OPT_LEN) {
2577 cur_opt[p] = *options_str;
2583 if (!strcmp(cur_opt, "inband-tags")) {
2584 options->inband_tags = 1;
2585 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2586 options->tags_ecc_on = 0;
2587 options->tags_ecc_overridden = 1;
2588 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2589 options->tags_ecc_on = 1;
2590 options->tags_ecc_overridden = 1;
2591 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2592 options->lazy_loading_enabled = 0;
2593 options->lazy_loading_overridden = 1;
2594 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2595 options->lazy_loading_enabled = 1;
2596 options->lazy_loading_overridden = 1;
2597 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2598 options->empty_lost_and_found = 0;
2599 options->empty_lost_and_found_overridden = 1;
2600 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2601 options->empty_lost_and_found = 1;
2602 options->empty_lost_and_found_overridden = 1;
2603 } else if (!strcmp(cur_opt, "no-cache")) {
2604 options->no_cache = 1;
2605 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2606 options->skip_checkpoint_read = 1;
2607 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2608 options->skip_checkpoint_write = 1;
2609 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2610 options->skip_checkpoint_read = 1;
2611 options->skip_checkpoint_write = 1;
2613 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2622 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2623 struct super_block *sb,
2624 void *data, int silent)
2627 struct inode *inode = NULL;
2628 struct dentry *root;
2629 struct yaffs_dev *dev = 0;
2630 char devname_buf[BDEVNAME_SIZE + 1];
2631 struct mtd_info *mtd;
2633 char *data_str = (char *)data;
2634 struct yaffs_linux_context *context = NULL;
2635 struct yaffs_param *param;
2639 struct yaffs_options options;
2643 struct yaffs_linux_context *context_iterator;
2644 struct list_head *l;
2646 sb->s_magic = YAFFS_MAGIC;
2647 sb->s_op = &yaffs_super_ops;
2648 sb->s_flags |= MS_NOATIME;
2650 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2652 #ifdef YAFFS_COMPILE_EXPORTFS
2653 sb->s_export_op = &yaffs_export_ops;
2657 printk(KERN_INFO "yaffs: sb is NULL\n");
2658 else if (!sb->s_dev)
2659 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2660 else if (!yaffs_devname(sb, devname_buf))
2661 printk(KERN_INFO "yaffs: devname is NULL\n");
2663 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2665 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2670 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2672 memset(&options, 0, sizeof(options));
2674 if (yaffs_parse_options(&options, data_str)) {
2675 /* Option parsing failed */
2679 sb->s_blocksize = PAGE_CACHE_SIZE;
2680 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2683 (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
2685 (TSTR("yaffs_read_super: block size %d\n"), (int)(sb->s_blocksize)));
2687 T(YAFFS_TRACE_ALWAYS,
2688 (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
2689 MAJOR(sb->s_dev), MINOR(sb->s_dev), yaffs_devname(sb, devname_buf)));
2691 /* Check it's an mtd device..... */
2692 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2693 return NULL; /* This isn't an mtd device */
2695 /* Get the device */
2696 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2698 T(YAFFS_TRACE_ALWAYS,
2699 (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
2703 /* Check it's NAND */
2704 if (mtd->type != MTD_NANDFLASH) {
2705 T(YAFFS_TRACE_ALWAYS,
2706 (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
2711 T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
2712 T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
2713 T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
2714 T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
2715 T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
2716 T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
2717 T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
2718 T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2719 T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
2720 T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
2721 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
2722 T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
2724 T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
2727 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2729 if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2730 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs2\n")));
2734 /* Added NCB 26/5/2006 for completeness */
2735 if (yaffs_version == 2 && !options.inband_tags
2736 && WRITE_SIZE(mtd) == 512) {
2737 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs1\n")));
2742 if (yaffs_version == 2) {
2743 /* Check for version 2 style functions */
2745 !mtd->block_isbad ||
2746 !mtd->block_markbad || !mtd->read || !mtd->write ||
2747 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2748 !mtd->read_oob || !mtd->write_oob) {
2751 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2753 T(YAFFS_TRACE_ALWAYS,
2754 (TSTR("yaffs: MTD device does not support required "
2759 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2760 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2761 !options.inband_tags) {
2762 T(YAFFS_TRACE_ALWAYS,
2763 (TSTR("yaffs: MTD device does not have the "
2764 "right page sizes\n")));
2768 /* Check for V1 style functions */
2769 if (!mtd->erase || !mtd->read || !mtd->write ||
2770 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2771 !mtd->read_oob || !mtd->write_oob) {
2774 !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
2776 T(YAFFS_TRACE_ALWAYS,
2777 (TSTR("yaffs: MTD device does not support required "
2782 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2783 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2784 T(YAFFS_TRACE_ALWAYS,
2785 (TSTR("yaffs: MTD device does not support have the "
2786 "right page sizes\n")));
2791 /* OK, so if we got here, we have an MTD that's NAND and looks
2792 * like it has the right capabilities
2793 * Set the struct yaffs_dev up for mtd
2796 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2799 "yaffs: mtd is read only, setting superblock read only");
2800 sb->s_flags |= MS_RDONLY;
2803 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2804 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2806 if (!dev || !context) {
2816 /* Deep shit could not allocate device structure */
2817 T(YAFFS_TRACE_ALWAYS,
2818 (TSTR("yaffs_read_super: Failed trying to allocate "
2819 "struct yaffs_dev. \n")));
2822 memset(dev, 0, sizeof(struct yaffs_dev));
2823 param = &(dev->param);
2825 memset(context, 0, sizeof(struct yaffs_linux_context));
2826 dev->os_context = context;
2827 INIT_LIST_HEAD(&(context->context_list));
2829 context->super = sb;
2831 dev->read_only = read_only;
2833 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
2834 sb->s_fs_info = dev;
2836 sb->u.generic_sbp = dev;
2839 dev->driver_context = mtd;
2840 param->name = mtd->name;
2842 /* Set up the memory size parameters.... */
2845 YCALCBLOCKS(mtd->size,
2846 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2848 param->start_block = 0;
2849 param->end_block = n_blocks - 1;
2850 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2851 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2852 param->n_reserved_blocks = 5;
2853 param->n_caches = (options.no_cache) ? 0 : 10;
2854 param->inband_tags = options.inband_tags;
2856 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2857 param->disable_lazy_load = 1;
2859 #ifdef CONFIG_YAFFS_XATTR
2860 param->enable_xattr = 1;
2862 if (options.lazy_loading_overridden)
2863 param->disable_lazy_load = !options.lazy_loading_enabled;
2865 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2866 param->no_tags_ecc = 1;
2869 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2871 param->defered_dir_update = 1;
2874 if (options.tags_ecc_overridden)
2875 param->no_tags_ecc = !options.tags_ecc_on;
2877 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2878 param->empty_lost_n_found = 1;
2881 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2882 param->refresh_period = 0;
2884 param->refresh_period = 500;
2887 #ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
2888 param->always_check_erased = 1;
2891 if (options.empty_lost_and_found_overridden)
2892 param->empty_lost_n_found = options.empty_lost_and_found;
2894 /* ... and the functions. */
2895 if (yaffs_version == 2) {
2896 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2897 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2898 param->bad_block_fn = nandmtd2_mark_block_bad;
2899 param->query_block_fn = nandmtd2_query_block;
2900 yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize);
2901 param->is_yaffs2 = 1;
2902 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2903 param->total_bytes_per_chunk = mtd->writesize;
2904 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2906 param->total_bytes_per_chunk = mtd->oobblock;
2907 param->chunks_per_block = mtd->erasesize / mtd->oobblock;
2909 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2911 param->start_block = 0;
2912 param->end_block = n_blocks - 1;
2914 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
2915 /* use the MTD interface in yaffs_mtdif1.c */
2916 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2917 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2918 param->bad_block_fn = nandmtd1_mark_block_bad;
2919 param->query_block_fn = nandmtd1_query_block;
2921 param->write_chunk_fn = nandmtd_write_chunk;
2922 param->read_chunk_fn = nandmtd_read_chunk;
2924 param->is_yaffs2 = 0;
2926 /* ... and common functions */
2927 param->erase_fn = nandmtd_erase_block;
2928 param->initialise_flash_fn = nandmtd_initialise;
2930 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2932 param->sb_dirty_fn = yaffs_touch_super;
2933 param->gc_control = yaffs_gc_control_callback;
2935 yaffs_dev_to_lc(dev)->super = sb;
2937 #ifndef CONFIG_YAFFS_DOES_ECC
2938 param->use_nand_ecc = 1;
2941 #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
2942 param->wide_tnodes_disabled = 1;
2945 param->skip_checkpt_rd = options.skip_checkpoint_read;
2946 param->skip_checkpt_wr = options.skip_checkpoint_write;
2948 mutex_lock(&yaffs_context_lock);
2949 /* Get a mount id */
2951 for (mount_id = 0; !found; mount_id++) {
2953 list_for_each(l, &yaffs_context_list) {
2955 list_entry(l, struct yaffs_linux_context,
2957 if (context_iterator->mount_id == mount_id)
2961 context->mount_id = mount_id;
2963 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2964 &yaffs_context_list);
2965 mutex_unlock(&yaffs_context_lock);
2967 /* Directory search handling... */
2968 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2969 param->remove_obj_fn = yaffs_remove_obj_callback;
2971 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2973 yaffs_gross_lock(dev);
2975 err = yaffs_guts_initialise(dev);
2978 (TSTR("yaffs_read_super: guts initialised %s\n"),
2979 (err == YAFFS_OK) ? "OK" : "FAILED"));
2981 if (err == YAFFS_OK)
2982 yaffs_bg_start(dev);
2984 if (!context->bg_thread)
2985 param->defered_dir_update = 0;
2987 /* Release lock before yaffs_get_inode() */
2988 yaffs_gross_unlock(dev);
2990 /* Create root inode */
2991 if (err == YAFFS_OK)
2992 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2997 inode->i_op = &yaffs_dir_inode_operations;
2998 inode->i_fop = &yaffs_dir_operations;
3000 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
3002 root = d_alloc_root(inode);
3004 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
3011 sb->s_dirt = !dev->is_checkpointed;
3012 T(YAFFS_TRACE_ALWAYS,
3013 (TSTR("yaffs_read_super: is_checkpointed %d\n"),
3014 dev->is_checkpointed));
3016 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
3020 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3021 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
3024 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
3027 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3028 static int yaffs_read_super(struct file_system_type *fs,
3029 int flags, const char *dev_name,
3030 void *data, struct vfsmount *mnt)
3033 return get_sb_bdev(fs, flags, dev_name, data,
3034 yaffs_internal_read_super_mtd, mnt);
3037 static struct super_block *yaffs_read_super(struct file_system_type *fs,
3038 int flags, const char *dev_name,
3042 return get_sb_bdev(fs, flags, dev_name, data,
3043 yaffs_internal_read_super_mtd);
3047 static struct file_system_type yaffs_fs_type = {
3048 .owner = THIS_MODULE,
3050 .get_sb = yaffs_read_super,
3051 .kill_sb = kill_block_super,
3052 .fs_flags = FS_REQUIRES_DEV,
3055 static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
3058 return yaffs_internal_read_super(1, sb, data, silent);
3061 static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
3065 #ifdef CONFIG_YAFFS_YAFFS2
3067 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
3068 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
3071 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
3074 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
3075 static int yaffs2_read_super(struct file_system_type *fs,
3076 int flags, const char *dev_name, void *data,
3077 struct vfsmount *mnt)
3079 return get_sb_bdev(fs, flags, dev_name, data,
3080 yaffs2_internal_read_super_mtd, mnt);
3083 static struct super_block *yaffs2_read_super(struct file_system_type *fs,
3084 int flags, const char *dev_name,
3088 return get_sb_bdev(fs, flags, dev_name, data,
3089 yaffs2_internal_read_super_mtd);
3093 static struct file_system_type yaffs2_fs_type = {
3094 .owner = THIS_MODULE,
3096 .get_sb = yaffs2_read_super,
3097 .kill_sb = kill_block_super,
3098 .fs_flags = FS_REQUIRES_DEV,
3101 static struct super_block *yaffs2_read_super(struct super_block *sb,
3102 void *data, int silent)
3104 return yaffs_internal_read_super(2, sb, data, silent);
3107 static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
3111 #endif /* CONFIG_YAFFS_YAFFS2 */
3113 static struct proc_dir_entry *my_proc_entry;
3114 static struct proc_dir_entry *debug_proc_entry;
3116 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
3119 sprintf(buf, "start_block.......... %d\n", dev->param.start_block);
3120 buf += sprintf(buf, "end_block............ %d\n", dev->param.end_block);
3122 sprintf(buf, "total_bytes_per_chunk %d\n",
3123 dev->param.total_bytes_per_chunk);
3125 sprintf(buf, "use_nand_ecc......... %d\n", dev->param.use_nand_ecc);
3127 sprintf(buf, "no_tags_ecc.......... %d\n", dev->param.no_tags_ecc);
3128 buf += sprintf(buf, "is_yaffs2............ %d\n", dev->param.is_yaffs2);
3130 sprintf(buf, "inband_tags.......... %d\n", dev->param.inband_tags);
3132 sprintf(buf, "empty_lost_n_found... %d\n",
3133 dev->param.empty_lost_n_found);
3135 sprintf(buf, "disable_lazy_load.... %d\n",
3136 dev->param.disable_lazy_load);
3138 sprintf(buf, "refresh_period....... %d\n",
3139 dev->param.refresh_period);
3140 buf += sprintf(buf, "n_caches............. %d\n", dev->param.n_caches);
3142 sprintf(buf, "n_reserved_blocks.... %d\n",
3143 dev->param.n_reserved_blocks);
3145 sprintf(buf, "always_check_erased.. %d\n",
3146 dev->param.always_check_erased);
3148 buf += sprintf(buf, "\n");
3153 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
3156 sprintf(buf, "data_bytes_per_chunk. %d\n",
3157 dev->data_bytes_per_chunk);
3158 buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
3159 buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
3160 buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
3162 sprintf(buf, "blocks_in_checkpt.... %d\n", dev->blocks_in_checkpt);
3163 buf += sprintf(buf, "\n");
3164 buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
3165 buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
3166 buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
3167 buf += sprintf(buf, "\n");
3168 buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
3169 buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
3170 buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
3171 buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
3172 buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
3174 sprintf(buf, "passive_gc_count..... %u\n", dev->passive_gc_count);
3176 sprintf(buf, "oldest_dirty_gc_count %u\n",
3177 dev->oldest_dirty_gc_count);
3178 buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
3179 buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
3181 sprintf(buf, "n_retired_writes..... %u\n", dev->n_retired_writes);
3183 sprintf(buf, "n_retired_blocks..... %u\n", dev->n_retired_blocks);
3184 buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
3185 buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
3187 sprintf(buf, "n_tags_ecc_fixed..... %u\n", dev->n_tags_ecc_fixed);
3189 sprintf(buf, "n_tags_ecc_unfixed... %u\n", dev->n_tags_ecc_unfixed);
3190 buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
3191 buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
3193 sprintf(buf, "n_unlinked_files..... %u\n", dev->n_unlinked_files);
3194 buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
3195 buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
3200 static int yaffs_proc_read(char *page,
3202 off_t offset, int count, int *eof, void *data)
3204 struct list_head *item;
3209 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
3210 * We use 'offset' (*ppos) to indicate where we are in dev_list.
3211 * This also assumes the user has posted a read buffer large
3212 * enough to hold the complete output; but that's life in /proc.
3217 /* Print header first */
3221 "Multi-version YAFFS built:" __DATE__ " " __TIME__
3224 buf += sprintf(buf, "\n");
3228 mutex_lock(&yaffs_context_lock);
3230 /* Locate and print the Nth entry. Order N-squared but N is small. */
3231 list_for_each(item, &yaffs_context_list) {
3232 struct yaffs_linux_context *dc =
3233 list_entry(item, struct yaffs_linux_context,
3235 struct yaffs_dev *dev = dc->dev;
3237 if (n < (step & ~1)) {
3241 if ((step & 1) == 0) {
3243 sprintf(buf, "\nDevice %d \"%s\"\n", n,
3245 buf = yaffs_dump_dev_part0(buf, dev);
3247 buf = yaffs_dump_dev_part1(buf, dev);
3252 mutex_unlock(&yaffs_context_lock);
3255 return buf - page < count ? buf - page : count;
3258 static int yaffs_stats_proc_read(char *page,
3260 off_t offset, int count, int *eof, void *data)
3262 struct list_head *item;
3266 mutex_lock(&yaffs_context_lock);
3268 /* Locate and print the Nth entry. Order N-squared but N is small. */
3269 list_for_each(item, &yaffs_context_list) {
3270 struct yaffs_linux_context *dc =
3271 list_entry(item, struct yaffs_linux_context, context_list);
3272 struct yaffs_dev *dev = dc->dev;
3277 dev->n_erased_blocks * dev->param.chunks_per_block;
3279 buf += sprintf(buf, "%d, %d, %d, %u, %u, %u, %u\n",
3280 n, dev->n_free_chunks, erased_chunks,
3281 dev->bg_gcs, dev->oldest_dirty_gc_count,
3282 dev->n_obj, dev->n_tnodes);
3284 mutex_unlock(&yaffs_context_lock);
3286 return buf - page < count ? buf - page : count;
3290 * Set the verbosity of the warnings and error messages.
3292 * Note that the names can only be a..z or _ with the current code.
3297 unsigned mask_bitfield;
3299 {"allocate", YAFFS_TRACE_ALLOCATE},
3300 {"always", YAFFS_TRACE_ALWAYS},
3301 {"background", YAFFS_TRACE_BACKGROUND},
3302 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
3303 {"buffers", YAFFS_TRACE_BUFFERS},
3304 {"bug", YAFFS_TRACE_BUG},
3305 {"checkpt", YAFFS_TRACE_CHECKPOINT},
3306 {"deletion", YAFFS_TRACE_DELETION},
3307 {"erase", YAFFS_TRACE_ERASE},
3308 {"error", YAFFS_TRACE_ERROR},
3309 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
3310 {"gc", YAFFS_TRACE_GC},
3311 {"lock", YAFFS_TRACE_LOCK},
3312 {"mtd", YAFFS_TRACE_MTD},
3313 {"nandaccess", YAFFS_TRACE_NANDACCESS},
3314 {"os", YAFFS_TRACE_OS},
3315 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
3316 {"scan", YAFFS_TRACE_SCAN},
3317 {"mount", YAFFS_TRACE_MOUNT},
3318 {"tracing", YAFFS_TRACE_TRACING},
3319 {"sync", YAFFS_TRACE_SYNC},
3320 {"write", YAFFS_TRACE_WRITE},
3321 {"verify", YAFFS_TRACE_VERIFY},
3322 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
3323 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
3324 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
3325 {"all", 0xffffffff},
3330 #define MAX_MASK_NAME_LENGTH 40
3331 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
3332 unsigned long count, void *data)
3334 unsigned rg = 0, mask_bitfield;
3338 char substring[MAX_MASK_NAME_LENGTH + 1];
3344 rg = yaffs_trace_mask;
3346 while (!done && (pos < count)) {
3348 while ((pos < count) && isspace(buf[pos]))
3365 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
3367 if (end > buf + pos) {
3368 mask_name = "numeral";
3369 len = end - (buf + pos);
3373 for (x = buf + pos, i = 0;
3374 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
3375 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
3377 substring[i] = '\0';
3379 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3380 if (strcmp(substring, mask_flags[i].mask_name)
3382 mask_name = mask_flags[i].mask_name;
3384 mask_flags[i].mask_bitfield;
3391 if (mask_name != NULL) {
3395 rg &= ~mask_bitfield;
3398 rg |= mask_bitfield;
3404 rg |= mask_bitfield;
3410 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
3412 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
3414 if (rg & YAFFS_TRACE_ALWAYS) {
3415 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
3417 flag = ((rg & mask_flags[i].mask_bitfield) ==
3418 mask_flags[i].mask_bitfield) ? '+' : '-';
3419 printk(KERN_DEBUG "%c%s\n", flag,
3420 mask_flags[i].mask_name);
3427 static int yaffs_proc_write(struct file *file, const char *buf,
3428 unsigned long count, void *data)
3430 return yaffs_proc_write_trace_options(file, buf, count, data);
3433 /* Stuff to handle installation of file systems */
3434 struct file_system_to_install {
3435 struct file_system_type *fst;
3439 static struct file_system_to_install fs_to_install[] = {
3440 {&yaffs_fs_type, 0},
3441 {&yaffs2_fs_type, 0},
3445 static int __init init_yaffs_fs(void)
3448 struct file_system_to_install *fsinst;
3450 T(YAFFS_TRACE_ALWAYS,
3451 (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
3453 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
3454 T(YAFFS_TRACE_ALWAYS,
3456 (" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
3459 mutex_init(&yaffs_context_lock);
3461 /* Install the proc_fs entries */
3462 my_proc_entry = create_proc_entry("yaffs",
3463 S_IRUGO | S_IFREG, YPROC_ROOT);
3465 if (my_proc_entry) {
3466 my_proc_entry->write_proc = yaffs_proc_write;
3467 my_proc_entry->read_proc = yaffs_proc_read;
3468 my_proc_entry->data = NULL;
3473 debug_proc_entry = create_proc_entry("yaffs_stats",
3474 S_IRUGO | S_IFREG, YPROC_ROOT);
3476 if (debug_proc_entry) {
3477 debug_proc_entry->write_proc = NULL;
3478 debug_proc_entry->read_proc = yaffs_stats_proc_read;
3479 debug_proc_entry->data = NULL;
3484 /* Now add the file system entries */
3486 fsinst = fs_to_install;
3488 while (fsinst->fst && !error) {
3489 error = register_filesystem(fsinst->fst);
3491 fsinst->installed = 1;
3495 /* Any errors? uninstall */
3497 fsinst = fs_to_install;
3499 while (fsinst->fst) {
3500 if (fsinst->installed) {
3501 unregister_filesystem(fsinst->fst);
3502 fsinst->installed = 0;
3511 static void __exit exit_yaffs_fs(void)
3514 struct file_system_to_install *fsinst;
3516 T(YAFFS_TRACE_ALWAYS,
3517 (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
3519 remove_proc_entry("yaffs", YPROC_ROOT);
3520 remove_proc_entry("yaffs_stats", YPROC_ROOT);
3522 fsinst = fs_to_install;
3524 while (fsinst->fst) {
3525 if (fsinst->installed) {
3526 unregister_filesystem(fsinst->fst);
3527 fsinst->installed = 0;
3533 module_init(init_yaffs_fs)
3534 module_exit(exit_yaffs_fs)
3536 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
3537 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
3538 MODULE_LICENSE("GPL");