2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
23 * This is the file system front-end to YAFFS that hooks it up to
27 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
35 * NB There are two variants of Linux VFS glue code. This variant supports
36 * a single version and should not include any multi-version code.
38 #include <linux/version.h>
39 #include <linux/kernel.h>
40 #include <linux/module.h>
41 #include <linux/slab.h>
42 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/smp_lock.h>
46 #include <linux/pagemap.h>
47 #include <linux/mtd/mtd.h>
48 #include <linux/interrupt.h>
49 #include <linux/string.h>
50 #include <linux/ctype.h>
51 #include <linux/namei.h>
52 #include <linux/exportfs.h>
53 #include <linux/kthread.h>
54 #include <linux/delay.h>
55 #include <linux/freezer.h>
56 #include <asm/div64.h>
57 #include <linux/statfs.h>
58 #include <linux/uaccess.h>
59 #include <linux/mtd/mtd.h>
62 #include "yaffs_trace.h"
63 #include "yaffs_guts.h"
64 #include "yaffs_attribs.h"
65 #include "yaffs_linux.h"
66 #include "yaffs_mtdif.h"
67 #include "yaffs_mtdif1.h"
68 #include "yaffs_mtdif2.h"
70 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
71 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
72 unsigned int yaffs_auto_checkpoint = 1;
73 unsigned int yaffs_gc_control = 1;
74 unsigned int yaffs_bg_enable = 1;
76 /* Module Parameters */
77 module_param(yaffs_trace_mask, uint, 0644);
78 module_param(yaffs_wr_attempts, uint, 0644);
79 module_param(yaffs_auto_checkpoint, uint, 0644);
80 module_param(yaffs_gc_control, uint, 0644);
81 module_param(yaffs_bg_enable, uint, 0644);
83 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
85 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
87 uint64_t result = partition_size;
89 do_div(result, block_size);
90 return (uint32_t) result;
93 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
94 #define yaffs_inode_to_obj(iptr)\
95 ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
96 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
97 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
99 #define update_dir_time(dir) do {\
100 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
104 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
106 return yaffs_gc_control;
109 static void yaffs_gross_lock(struct yaffs_dev *dev)
111 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
112 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
113 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
116 static void yaffs_gross_unlock(struct yaffs_dev *dev)
118 yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
119 mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
122 static void yaffs_fill_inode_from_obj(struct inode *inode,
123 struct yaffs_obj *obj);
125 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
128 struct yaffs_obj *obj;
129 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
131 yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
133 inode = iget_locked(sb, ino);
135 return ERR_PTR(-ENOMEM);
136 if (!(inode->i_state & I_NEW))
139 /* NB This is called as a side effect of other functions, but
140 * we had to release the lock to prevent deadlocks, so
141 * need to lock again.
144 yaffs_gross_lock(dev);
146 obj = yaffs_find_by_number(dev, inode->i_ino);
147 yaffs_fill_inode_from_obj(inode, obj);
149 yaffs_gross_unlock(dev);
151 unlock_new_inode(inode);
155 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
156 struct yaffs_obj *obj)
161 yaffs_trace(YAFFS_TRACE_OS,
162 "yaffs_get_inode for NULL super_block!!");
168 yaffs_trace(YAFFS_TRACE_OS,
169 "yaffs_get_inode for NULL object!!");
174 yaffs_trace(YAFFS_TRACE_OS,
175 "yaffs_get_inode for object %d",
178 inode = yaffs_iget(sb, obj->obj_id);
182 /* NB Side effect: iget calls back to yaffs_read_inode(). */
183 /* iget also increments the inode's i_count */
184 /* NB You can't be holding gross_lock or deadlock will happen! */
189 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
193 struct yaffs_obj *obj = NULL;
194 struct yaffs_dev *dev;
195 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
197 uid_t uid = current->cred->fsuid;
199 (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
201 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
205 yaffs_trace(YAFFS_TRACE_OS,
206 "yaffs_mknod: parent object %d type %d",
207 parent->obj_id, parent->variant_type);
209 yaffs_trace(YAFFS_TRACE_OS,
210 "yaffs_mknod: could not get parent object");
214 yaffs_trace(YAFFS_TRACE_OS,
215 "yaffs_mknod: making oject for %s, mode %x dev %x",
216 dentry->d_name.name, mode, rdev);
218 dev = parent->my_dev;
220 yaffs_gross_lock(dev);
222 switch (mode & S_IFMT) {
224 /* Special (socket, fifo, device...) */
225 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
227 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
228 gid, old_encode_dev(rdev));
230 case S_IFREG: /* file */
231 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
232 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
235 case S_IFDIR: /* directory */
236 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
237 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
240 case S_IFLNK: /* symlink */
241 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
242 obj = NULL; /* Do we ever get here? */
246 /* Can not call yaffs_get_inode() with gross lock held */
247 yaffs_gross_unlock(dev);
250 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
251 d_instantiate(dentry, inode);
252 update_dir_time(dir);
253 yaffs_trace(YAFFS_TRACE_OS,
254 "yaffs_mknod created object %d count = %d",
255 obj->obj_id, atomic_read(&inode->i_count));
257 yaffs_fill_inode_from_obj(dir, parent);
259 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
266 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
268 return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
271 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
274 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
277 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
278 struct dentry *dentry)
280 struct inode *inode = old_dentry->d_inode;
281 struct yaffs_obj *obj = NULL;
282 struct yaffs_obj *link = NULL;
283 struct yaffs_dev *dev;
285 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
287 obj = yaffs_inode_to_obj(inode);
290 yaffs_gross_lock(dev);
292 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
294 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
298 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
299 d_instantiate(dentry, old_dentry->d_inode);
300 atomic_inc(&old_dentry->d_inode->i_count);
301 yaffs_trace(YAFFS_TRACE_OS,
302 "yaffs_link link count %d i_count %d",
303 old_dentry->d_inode->i_nlink,
304 atomic_read(&old_dentry->d_inode->i_count));
307 yaffs_gross_unlock(dev);
310 update_dir_time(dir);
317 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
320 struct yaffs_obj *obj;
321 struct yaffs_dev *dev;
322 uid_t uid = current->cred->fsuid;
324 (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
326 yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
328 dev = yaffs_inode_to_obj(dir)->my_dev;
329 yaffs_gross_lock(dev);
330 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
331 S_IFLNK | S_IRWXUGO, uid, gid, symname);
332 yaffs_gross_unlock(dev);
337 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
338 d_instantiate(dentry, inode);
339 update_dir_time(dir);
340 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
343 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
349 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
352 struct yaffs_obj *obj;
353 struct inode *inode = NULL;
354 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
356 if (current != yaffs_dev_to_lc(dev)->readdir_process)
357 yaffs_gross_lock(dev);
359 yaffs_trace(YAFFS_TRACE_OS,
360 "yaffs_lookup for %d:%s",
361 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
363 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
365 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
367 /* Can't hold gross lock when calling yaffs_get_inode() */
368 if (current != yaffs_dev_to_lc(dev)->readdir_process)
369 yaffs_gross_unlock(dev);
372 yaffs_trace(YAFFS_TRACE_OS,
373 "yaffs_lookup found %d", obj->obj_id);
375 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
378 yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
379 d_add(dentry, inode);
385 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
389 d_add(dentry, inode);
394 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
397 struct yaffs_dev *dev;
398 struct yaffs_obj *obj;
400 yaffs_trace(YAFFS_TRACE_OS,
401 "yaffs_unlink %d:%s",
402 (int)(dir->i_ino), dentry->d_name.name);
403 obj = yaffs_inode_to_obj(dir);
406 yaffs_gross_lock(dev);
408 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
410 if (ret_val == YAFFS_OK) {
411 dentry->d_inode->i_nlink--;
413 yaffs_gross_unlock(dev);
414 mark_inode_dirty(dentry->d_inode);
415 update_dir_time(dir);
418 yaffs_gross_unlock(dev);
422 static int yaffs_sync_object(struct file *file, int datasync)
425 struct yaffs_obj *obj;
426 struct yaffs_dev *dev;
427 struct dentry *dentry = file->f_path.dentry;
429 obj = yaffs_dentry_to_obj(dentry);
433 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
434 yaffs_gross_lock(dev);
435 yaffs_flush_file(obj, 1, datasync);
436 yaffs_gross_unlock(dev);
440 * The VFS layer already does all the dentry stuff for rename.
442 * NB: POSIX says you can rename an object over an old object of the same name
444 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
445 struct inode *new_dir, struct dentry *new_dentry)
447 struct yaffs_dev *dev;
448 int ret_val = YAFFS_FAIL;
449 struct yaffs_obj *target;
451 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
452 dev = yaffs_inode_to_obj(old_dir)->my_dev;
454 yaffs_gross_lock(dev);
456 /* Check if the target is an existing directory that is not empty. */
457 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
458 new_dentry->d_name.name);
460 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
461 !list_empty(&target->variant.dir_variant.children)) {
463 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
465 ret_val = YAFFS_FAIL;
467 /* Now does unlinking internally using shadowing mechanism */
468 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
470 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
471 old_dentry->d_name.name,
472 yaffs_inode_to_obj(new_dir),
473 new_dentry->d_name.name);
475 yaffs_gross_unlock(dev);
477 if (ret_val == YAFFS_OK) {
479 new_dentry->d_inode->i_nlink--;
480 mark_inode_dirty(new_dentry->d_inode);
483 update_dir_time(old_dir);
484 if (old_dir != new_dir)
485 update_dir_time(new_dir);
492 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
494 struct inode *inode = dentry->d_inode;
496 struct yaffs_dev *dev;
498 yaffs_trace(YAFFS_TRACE_OS,
499 "yaffs_setattr of object %d",
500 yaffs_inode_to_obj(inode)->obj_id);
502 /* Fail if a requested resize >= 2GB */
503 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
507 error = inode_change_ok(inode, attr);
511 setattr_copy(inode, attr);
512 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
513 if (attr->ia_valid & ATTR_SIZE) {
514 truncate_setsize(inode, attr->ia_size);
515 inode->i_blocks = (inode->i_size + 511) >> 9;
518 dev = yaffs_inode_to_obj(inode)->my_dev;
519 if (attr->ia_valid & ATTR_SIZE) {
520 yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
521 (int)(attr->ia_size),
522 (int)(attr->ia_size));
524 yaffs_gross_lock(dev);
525 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
526 if (result == YAFFS_OK)
530 yaffs_gross_unlock(dev);
533 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
538 #ifdef CONFIG_YAFFS_XATTR
539 static int yaffs_setxattr(struct dentry *dentry, const char *name,
540 const void *value, size_t size, int flags)
542 struct inode *inode = dentry->d_inode;
544 struct yaffs_dev *dev;
545 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
547 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
552 yaffs_gross_lock(dev);
553 result = yaffs_set_xattrib(obj, name, value, size, flags);
554 if (result == YAFFS_OK)
558 yaffs_gross_unlock(dev);
560 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
565 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
566 void *buff, size_t size)
568 struct inode *inode = dentry->d_inode;
570 struct yaffs_dev *dev;
571 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
573 yaffs_trace(YAFFS_TRACE_OS,
574 "yaffs_getxattr \"%s\" from object %d",
579 yaffs_gross_lock(dev);
580 error = yaffs_get_xattrib(obj, name, buff, size);
581 yaffs_gross_unlock(dev);
583 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
588 static int yaffs_removexattr(struct dentry *dentry, const char *name)
590 struct inode *inode = dentry->d_inode;
592 struct yaffs_dev *dev;
593 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
595 yaffs_trace(YAFFS_TRACE_OS,
596 "yaffs_removexattr of object %d", obj->obj_id);
601 yaffs_gross_lock(dev);
602 result = yaffs_remove_xattrib(obj, name);
603 if (result == YAFFS_OK)
607 yaffs_gross_unlock(dev);
609 yaffs_trace(YAFFS_TRACE_OS,
610 "yaffs_removexattr done returning %d", error);
615 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
617 struct inode *inode = dentry->d_inode;
619 struct yaffs_dev *dev;
620 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
622 yaffs_trace(YAFFS_TRACE_OS,
623 "yaffs_listxattr of object %d", obj->obj_id);
627 yaffs_gross_lock(dev);
628 error = yaffs_list_xattrib(obj, buff, size);
629 yaffs_gross_unlock(dev);
631 yaffs_trace(YAFFS_TRACE_OS,
632 "yaffs_listxattr done returning %d", error);
639 static const struct inode_operations yaffs_dir_inode_operations = {
640 .create = yaffs_create,
641 .lookup = yaffs_lookup,
643 .unlink = yaffs_unlink,
644 .symlink = yaffs_symlink,
645 .mkdir = yaffs_mkdir,
646 .rmdir = yaffs_unlink,
647 .mknod = yaffs_mknod,
648 .rename = yaffs_rename,
649 .setattr = yaffs_setattr,
650 #ifdef CONFIG_YAFFS_XATTR
651 .setxattr = yaffs_setxattr,
652 .getxattr = yaffs_getxattr,
653 .listxattr = yaffs_listxattr,
654 .removexattr = yaffs_removexattr,
657 /*-----------------------------------------------------------------*/
658 /* Directory search context allows us to unlock access to yaffs during
659 * filldir without causing problems with the directory being modified.
660 * This is similar to the tried and tested mechanism used in yaffs direct.
662 * A search context iterates along a doubly linked list of siblings in the
663 * directory. If the iterating object is deleted then this would corrupt
664 * the list iteration, likely causing a crash. The search context avoids
665 * this by using the remove_obj_fn to move the search context to the
666 * next object before the object is deleted.
668 * Many readdirs (and thus seach conexts) may be alive simulateously so
669 * each struct yaffs_dev has a list of these.
671 * A seach context lives for the duration of a readdir.
673 * All these functions must be called while yaffs is locked.
676 struct yaffs_search_context {
677 struct yaffs_dev *dev;
678 struct yaffs_obj *dir_obj;
679 struct yaffs_obj *next_return;
680 struct list_head others;
684 * yaffs_new_search() creates a new search context, initialises it and
685 * adds it to the device's search context list.
687 * Called at start of readdir.
689 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
691 struct yaffs_dev *dev = dir->my_dev;
692 struct yaffs_search_context *sc =
693 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
698 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
699 sc->next_return = NULL;
702 list_entry(dir->variant.dir_variant.children.next,
703 struct yaffs_obj, siblings);
704 INIT_LIST_HEAD(&sc->others);
705 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
711 * yaffs_search_end() disposes of a search context and cleans up.
713 static void yaffs_search_end(struct yaffs_search_context *sc)
716 list_del(&sc->others);
722 * yaffs_search_advance() moves a search context to the next object.
723 * Called when the search iterates or when an object removal causes
724 * the search context to be moved to the next object.
726 static void yaffs_search_advance(struct yaffs_search_context *sc)
731 if (sc->next_return == NULL ||
732 list_empty(&sc->dir_obj->variant.dir_variant.children))
733 sc->next_return = NULL;
735 struct list_head *next = sc->next_return->siblings.next;
737 if (next == &sc->dir_obj->variant.dir_variant.children)
738 sc->next_return = NULL; /* end of list */
741 list_entry(next, struct yaffs_obj, siblings);
746 * yaffs_remove_obj_callback() is called when an object is unlinked.
747 * We check open search contexts and advance any which are currently
748 * on the object being iterated.
750 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
754 struct yaffs_search_context *sc;
755 struct list_head *search_contexts =
756 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
758 /* Iterate through the directory search contexts.
759 * If any are currently on the object being removed, then advance
760 * the search context to the next object to prevent a hanging pointer.
762 list_for_each(i, search_contexts) {
763 sc = list_entry(i, struct yaffs_search_context, others);
764 if (sc->next_return == obj)
765 yaffs_search_advance(sc);
770 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
772 struct yaffs_obj *obj;
773 struct yaffs_dev *dev;
774 struct yaffs_search_context *sc;
775 struct inode *inode = f->f_dentry->d_inode;
776 unsigned long offset, curoffs;
779 char name[YAFFS_MAX_NAME_LENGTH + 1];
781 obj = yaffs_dentry_to_obj(f->f_dentry);
784 yaffs_gross_lock(dev);
786 yaffs_dev_to_lc(dev)->readdir_process = current;
790 sc = yaffs_new_search(obj);
796 yaffs_trace(YAFFS_TRACE_OS,
797 "yaffs_readdir: starting at %d", (int)offset);
800 yaffs_trace(YAFFS_TRACE_OS,
801 "yaffs_readdir: entry . ino %d",
803 yaffs_gross_unlock(dev);
804 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
805 yaffs_gross_lock(dev);
808 yaffs_gross_lock(dev);
813 yaffs_trace(YAFFS_TRACE_OS,
814 "yaffs_readdir: entry .. ino %d",
815 (int)f->f_dentry->d_parent->d_inode->i_ino);
816 yaffs_gross_unlock(dev);
817 if (filldir(dirent, "..", 2, offset,
818 f->f_dentry->d_parent->d_inode->i_ino,
820 yaffs_gross_lock(dev);
823 yaffs_gross_lock(dev);
830 /* If the directory has changed since the open or last call to
831 readdir, rewind to after the 2 canned entries. */
832 if (f->f_version != inode->i_version) {
835 f->f_version = inode->i_version;
838 while (sc->next_return) {
841 if (curoffs >= offset) {
842 int this_inode = yaffs_get_obj_inode(l);
843 int this_type = yaffs_get_obj_type(l);
845 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
846 yaffs_trace(YAFFS_TRACE_OS,
847 "yaffs_readdir: %s inode %d",
848 name, yaffs_get_obj_inode(l));
850 yaffs_gross_unlock(dev);
855 offset, this_inode, this_type) < 0) {
856 yaffs_gross_lock(dev);
860 yaffs_gross_lock(dev);
865 yaffs_search_advance(sc);
869 yaffs_search_end(sc);
870 yaffs_dev_to_lc(dev)->readdir_process = NULL;
871 yaffs_gross_unlock(dev);
876 static const struct file_operations yaffs_dir_operations = {
877 .read = generic_read_dir,
878 .readdir = yaffs_readdir,
879 .fsync = yaffs_sync_object,
880 .llseek = generic_file_llseek,
885 static int yaffs_file_flush(struct file *file, fl_owner_t id)
887 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
888 struct yaffs_dev *dev = obj->my_dev;
890 yaffs_trace(YAFFS_TRACE_OS,
891 "yaffs_file_flush object %d (%s)",
892 obj->obj_id, obj->dirty ? "dirty" : "clean");
894 yaffs_gross_lock(dev);
896 yaffs_flush_file(obj, 1, 0);
898 yaffs_gross_unlock(dev);
903 static const struct file_operations yaffs_file_operations = {
904 .read = do_sync_read,
905 .write = do_sync_write,
906 .aio_read = generic_file_aio_read,
907 .aio_write = generic_file_aio_write,
908 .mmap = generic_file_mmap,
909 .flush = yaffs_file_flush,
910 .fsync = yaffs_sync_object,
911 .splice_read = generic_file_splice_read,
912 .splice_write = generic_file_splice_write,
913 .llseek = generic_file_llseek,
917 /* ExportFS support */
918 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
921 return yaffs_iget(sb, ino);
924 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
925 struct fid *fid, int fh_len,
928 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
929 yaffs2_nfs_get_inode);
932 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
933 struct fid *fid, int fh_len,
936 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
937 yaffs2_nfs_get_inode);
940 struct dentry *yaffs2_get_parent(struct dentry *dentry)
943 struct super_block *sb = dentry->d_inode->i_sb;
944 struct dentry *parent = ERR_PTR(-ENOENT);
946 unsigned long parent_ino;
947 struct yaffs_obj *d_obj;
948 struct yaffs_obj *parent_obj;
950 d_obj = yaffs_inode_to_obj(dentry->d_inode);
953 parent_obj = d_obj->parent;
955 parent_ino = yaffs_get_obj_inode(parent_obj);
956 inode = yaffs_iget(sb, parent_ino);
959 parent = ERR_CAST(inode);
961 parent = d_obtain_alias(inode);
962 if (!IS_ERR(parent)) {
963 parent = ERR_PTR(-ENOMEM);
972 /* Just declare a zero structure as a NULL value implies
973 * using the default functions of exportfs.
976 static struct export_operations yaffs_export_ops = {
977 .fh_to_dentry = yaffs2_fh_to_dentry,
978 .fh_to_parent = yaffs2_fh_to_parent,
979 .get_parent = yaffs2_get_parent,
983 /*-----------------------------------------------------------------*/
985 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
988 unsigned char *alias;
990 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
992 yaffs_gross_lock(dev);
994 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
996 yaffs_gross_unlock(dev);
1001 ret = vfs_readlink(dentry, buffer, buflen, alias);
1006 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1008 unsigned char *alias;
1010 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1012 yaffs_gross_lock(dev);
1014 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1015 yaffs_gross_unlock(dev);
1018 ret = ERR_PTR(-ENOMEM);
1022 nd_set_link(nd, alias);
1023 ret = (void *)alias;
1028 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1034 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
1036 /* Clear the association between the inode and
1037 * the struct yaffs_obj.
1039 obj->my_inode = NULL;
1040 yaffs_inode_to_obj_lv(inode) = NULL;
1042 /* If the object freeing was deferred, then the real
1044 * This should fix the inode inconsistency problem.
1046 yaffs_handle_defered_free(obj);
1049 /* yaffs_evict_inode combines into one operation what was previously done in
1050 * yaffs_clear_inode() and yaffs_delete_inode()
1053 static void yaffs_evict_inode(struct inode *inode)
1055 struct yaffs_obj *obj;
1056 struct yaffs_dev *dev;
1059 obj = yaffs_inode_to_obj(inode);
1061 yaffs_trace(YAFFS_TRACE_OS,
1062 "yaffs_evict_inode: ino %d, count %d %s",
1064 atomic_read(&inode->i_count),
1065 obj ? "object exists" : "null object");
1067 if (!inode->i_nlink && !is_bad_inode(inode))
1069 truncate_inode_pages(&inode->i_data, 0);
1070 end_writeback(inode);
1072 if (deleteme && obj) {
1074 yaffs_gross_lock(dev);
1076 yaffs_gross_unlock(dev);
1080 yaffs_gross_lock(dev);
1081 yaffs_unstitch_obj(inode, obj);
1082 yaffs_gross_unlock(dev);
1087 static void yaffs_touch_super(struct yaffs_dev *dev)
1089 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
1091 yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
1096 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
1098 /* Lifted from jffs2 */
1100 struct yaffs_obj *obj;
1101 unsigned char *pg_buf;
1103 struct yaffs_dev *dev;
1105 yaffs_trace(YAFFS_TRACE_OS,
1106 "yaffs_readpage_nolock at %08x, size %08x",
1107 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
1108 (unsigned)PAGE_CACHE_SIZE);
1110 obj = yaffs_dentry_to_obj(f->f_dentry);
1114 BUG_ON(!PageLocked(pg));
1117 /* FIXME: Can kmap fail? */
1119 yaffs_gross_lock(dev);
1121 ret = yaffs_file_rd(obj, pg_buf,
1122 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1124 yaffs_gross_unlock(dev);
1130 ClearPageUptodate(pg);
1133 SetPageUptodate(pg);
1137 flush_dcache_page(pg);
1140 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1144 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1146 int ret = yaffs_readpage_nolock(f, pg);
1152 static int yaffs_readpage(struct file *f, struct page *pg)
1156 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1157 ret = yaffs_readpage_unlock(f, pg);
1158 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1162 /* writepage inspired by/stolen from smbfs */
1164 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1166 struct yaffs_dev *dev;
1167 struct address_space *mapping = page->mapping;
1168 struct inode *inode;
1169 unsigned long end_index;
1171 struct yaffs_obj *obj;
1178 inode = mapping->host;
1181 i_size = i_size_read(inode);
1183 end_index = i_size >> PAGE_CACHE_SHIFT;
1185 if (page->index < end_index)
1186 n_bytes = PAGE_CACHE_SIZE;
1188 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1190 if (page->index > end_index || !n_bytes) {
1191 yaffs_trace(YAFFS_TRACE_OS,
1192 "yaffs_writepage at %08x, inode size = %08x!!!",
1193 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1194 (unsigned)inode->i_size);
1195 yaffs_trace(YAFFS_TRACE_OS,
1196 " -> don't care!!");
1198 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1199 set_page_writeback(page);
1201 end_page_writeback(page);
1206 if (n_bytes != PAGE_CACHE_SIZE)
1207 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1211 buffer = kmap(page);
1213 obj = yaffs_inode_to_obj(inode);
1215 yaffs_gross_lock(dev);
1217 yaffs_trace(YAFFS_TRACE_OS,
1218 "yaffs_writepage at %08x, size %08x",
1219 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1220 yaffs_trace(YAFFS_TRACE_OS,
1221 "writepag0: obj = %05x, ino = %05x",
1222 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1224 n_written = yaffs_wr_file(obj, buffer,
1225 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1227 yaffs_touch_super(dev);
1229 yaffs_trace(YAFFS_TRACE_OS,
1230 "writepag1: obj = %05x, ino = %05x",
1231 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1233 yaffs_gross_unlock(dev);
1236 set_page_writeback(page);
1238 end_page_writeback(page);
1241 return (n_written == n_bytes) ? 0 : -ENOSPC;
1244 /* Space holding and freeing is done to ensure we have space available for
1246 * For now we just assume few parallel writes and check against a small
1248 * Todo: need to do this with a counter to handle parallel reads better
1251 static ssize_t yaffs_hold_space(struct file *f)
1253 struct yaffs_obj *obj;
1254 struct yaffs_dev *dev;
1257 obj = yaffs_dentry_to_obj(f->f_dentry);
1261 yaffs_gross_lock(dev);
1263 n_free_chunks = yaffs_get_n_free_chunks(dev);
1265 yaffs_gross_unlock(dev);
1267 return (n_free_chunks > 20) ? 1 : 0;
1270 static void yaffs_release_space(struct file *f)
1272 struct yaffs_obj *obj;
1273 struct yaffs_dev *dev;
1275 obj = yaffs_dentry_to_obj(f->f_dentry);
1279 yaffs_gross_lock(dev);
1281 yaffs_gross_unlock(dev);
1284 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1285 loff_t pos, unsigned len, unsigned flags,
1286 struct page **pagep, void **fsdata)
1288 struct page *pg = NULL;
1289 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1294 pg = grab_cache_page_write_begin(mapping, index, flags);
1301 yaffs_trace(YAFFS_TRACE_OS,
1302 "start yaffs_write_begin index %d(%x) uptodate %d",
1303 (int)index, (int)index, PageUptodate(pg) ? 1 : 0);
1306 space_held = yaffs_hold_space(filp);
1313 /* Update page if required */
1315 if (!PageUptodate(pg))
1316 ret = yaffs_readpage_nolock(filp, pg);
1321 /* Happy path return */
1322 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1327 yaffs_trace(YAFFS_TRACE_OS,
1328 "end yaffs_write_begin fail returning %d", ret);
1330 yaffs_release_space(filp);
1333 page_cache_release(pg);
1338 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1341 struct yaffs_obj *obj;
1342 int n_written, ipos;
1343 struct inode *inode;
1344 struct yaffs_dev *dev;
1346 obj = yaffs_dentry_to_obj(f->f_dentry);
1349 /* This should not happen */
1350 yaffs_trace(YAFFS_TRACE_OS,
1351 "yaffs_file_write: hey obj is null!");
1357 yaffs_gross_lock(dev);
1359 inode = f->f_dentry->d_inode;
1361 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1362 ipos = inode->i_size;
1366 yaffs_trace(YAFFS_TRACE_OS,
1367 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1368 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1370 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1372 yaffs_touch_super(dev);
1374 yaffs_trace(YAFFS_TRACE_OS,
1375 "yaffs_file_write: %d(%x) bytes written",
1376 (unsigned)n, (unsigned)n);
1378 if (n_written > 0) {
1381 if (ipos > inode->i_size) {
1382 inode->i_size = ipos;
1383 inode->i_blocks = (ipos + 511) >> 9;
1385 yaffs_trace(YAFFS_TRACE_OS,
1386 "yaffs_file_write size updated to %d bytes, %d blocks",
1387 ipos, (int)(inode->i_blocks));
1390 yaffs_gross_unlock(dev);
1391 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1394 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1395 loff_t pos, unsigned len, unsigned copied,
1396 struct page *pg, void *fsdadata)
1400 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1403 addr = kva + offset_into_page;
1405 yaffs_trace(YAFFS_TRACE_OS,
1406 "yaffs_write_end addr %p pos %x n_bytes %d",
1407 addr, (unsigned)pos, copied);
1409 ret = yaffs_file_write(filp, addr, copied, &pos);
1411 if (ret != copied) {
1412 yaffs_trace(YAFFS_TRACE_OS,
1413 "yaffs_write_end not same size ret %d copied %d",
1420 yaffs_release_space(filp);
1422 page_cache_release(pg);
1426 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1428 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1429 struct super_block *sb = dentry->d_sb;
1431 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
1433 yaffs_gross_lock(dev);
1435 buf->f_type = YAFFS_MAGIC;
1436 buf->f_bsize = sb->s_blocksize;
1437 buf->f_namelen = 255;
1439 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1440 /* Do this if chunk size is not a power of 2 */
1442 uint64_t bytes_in_dev;
1443 uint64_t bytes_free;
1447 ((dev->param.end_block - dev->param.start_block +
1448 1))) * ((uint64_t) (dev->param.chunks_per_block *
1449 dev->data_bytes_per_chunk));
1451 do_div(bytes_in_dev, sb->s_blocksize);
1452 /* bytes_in_dev becomes the number of blocks */
1453 buf->f_blocks = bytes_in_dev;
1455 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
1456 ((uint64_t) (dev->data_bytes_per_chunk));
1458 do_div(bytes_free, sb->s_blocksize);
1460 buf->f_bfree = bytes_free;
1462 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1465 (dev->param.end_block - dev->param.start_block + 1) *
1466 dev->param.chunks_per_block /
1467 (sb->s_blocksize / dev->data_bytes_per_chunk);
1469 yaffs_get_n_free_chunks(dev) /
1470 (sb->s_blocksize / dev->data_bytes_per_chunk);
1473 (dev->param.end_block - dev->param.start_block + 1) *
1474 dev->param.chunks_per_block *
1475 (dev->data_bytes_per_chunk / sb->s_blocksize);
1478 yaffs_get_n_free_chunks(dev) *
1479 (dev->data_bytes_per_chunk / sb->s_blocksize);
1484 buf->f_bavail = buf->f_bfree;
1486 yaffs_gross_unlock(dev);
1490 static void yaffs_flush_inodes(struct super_block *sb)
1493 struct yaffs_obj *obj;
1495 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
1496 obj = yaffs_inode_to_obj(iptr);
1498 yaffs_trace(YAFFS_TRACE_OS,
1499 "flushing obj %d", obj->obj_id);
1500 yaffs_flush_file(obj, 1, 0);
1505 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1507 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1512 yaffs_flush_inodes(sb);
1513 yaffs_update_dirty_dirs(dev);
1514 yaffs_flush_whole_cache(dev);
1516 yaffs_checkpoint_save(dev);
1519 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1521 unsigned erased_chunks =
1522 dev->n_erased_blocks * dev->param.chunks_per_block;
1523 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1524 unsigned scattered = 0; /* Free chunks not in an erased block */
1526 if (erased_chunks < dev->n_free_chunks)
1527 scattered = (dev->n_free_chunks - erased_chunks);
1529 if (!context->bg_running)
1531 else if (scattered < (dev->param.chunks_per_block * 2))
1533 else if (erased_chunks > dev->n_free_chunks / 2)
1535 else if (erased_chunks > dev->n_free_chunks / 4)
1541 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
1544 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1545 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1546 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1549 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1550 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
1552 sb->s_dirt ? "dirty" : "clean",
1553 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1554 oneshot_checkpoint ? " one-shot" : "");
1556 yaffs_gross_lock(dev);
1557 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1558 oneshot_checkpoint) && !dev->is_checkpointed;
1560 if (sb->s_dirt || do_checkpoint) {
1561 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1563 if (oneshot_checkpoint)
1564 yaffs_auto_checkpoint &= ~4;
1566 yaffs_gross_unlock(dev);
1572 * yaffs background thread functions .
1573 * yaffs_bg_thread_fn() the thread function
1574 * yaffs_bg_start() launches the background thread.
1575 * yaffs_bg_stop() cleans up the background thread.
1578 * The thread should only run after the yaffs is initialised
1579 * The thread should be stopped before yaffs is unmounted.
1580 * The thread should not do any writing while the fs is in read only.
1583 void yaffs_background_waker(unsigned long data)
1585 wake_up_process((struct task_struct *)data);
1588 static int yaffs_bg_thread_fn(void *data)
1590 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1591 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1592 unsigned long now = jiffies;
1593 unsigned long next_dir_update = now;
1594 unsigned long next_gc = now;
1595 unsigned long expires;
1596 unsigned int urgency;
1598 struct timer_list timer;
1600 yaffs_trace(YAFFS_TRACE_BACKGROUND,
1601 "yaffs_background starting for dev %p", (void *)dev);
1604 while (context->bg_running) {
1605 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
1607 if (kthread_should_stop())
1610 if (try_to_freeze())
1613 yaffs_gross_lock(dev);
1617 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1618 yaffs_update_dirty_dirs(dev);
1619 next_dir_update = now + HZ;
1622 if (time_after(now, next_gc) && yaffs_bg_enable) {
1623 if (!dev->is_checkpointed) {
1624 urgency = yaffs_bg_gc_urgency(dev);
1625 gc_result = yaffs_bg_gc(dev, urgency);
1627 next_gc = now + HZ / 20 + 1;
1628 else if (urgency > 0)
1629 next_gc = now + HZ / 10 + 1;
1631 next_gc = now + HZ * 2;
1634 * gc not running so set to next_dir_update
1635 * to cut down on wake ups
1637 next_gc = next_dir_update;
1640 yaffs_gross_unlock(dev);
1641 expires = next_dir_update;
1642 if (time_before(next_gc, expires))
1644 if (time_before(expires, now))
1647 init_timer_on_stack(&timer);
1648 timer.expires = expires + 1;
1649 timer.data = (unsigned long)current;
1650 timer.function = yaffs_background_waker;
1652 set_current_state(TASK_INTERRUPTIBLE);
1655 del_timer_sync(&timer);
1661 static int yaffs_bg_start(struct yaffs_dev *dev)
1664 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1669 context->bg_running = 1;
1671 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1672 (void *)dev, "yaffs-bg-%d",
1675 if (IS_ERR(context->bg_thread)) {
1676 retval = PTR_ERR(context->bg_thread);
1677 context->bg_thread = NULL;
1678 context->bg_running = 0;
1683 static void yaffs_bg_stop(struct yaffs_dev *dev)
1685 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1687 ctxt->bg_running = 0;
1689 if (ctxt->bg_thread) {
1690 kthread_stop(ctxt->bg_thread);
1691 ctxt->bg_thread = NULL;
1695 static void yaffs_write_super(struct super_block *sb)
1697 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
1699 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1700 "yaffs_write_super%s",
1701 request_checkpoint ? " checkpt" : "");
1703 yaffs_do_sync_fs(sb, request_checkpoint);
1707 static int yaffs_sync_fs(struct super_block *sb, int wait)
1709 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
1711 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1712 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
1714 yaffs_do_sync_fs(sb, request_checkpoint);
1719 static LIST_HEAD(yaffs_context_list);
1720 struct mutex yaffs_context_lock;
1722 struct yaffs_options {
1724 int skip_checkpoint_read;
1725 int skip_checkpoint_write;
1728 int tags_ecc_overridden;
1729 int lazy_loading_enabled;
1730 int lazy_loading_overridden;
1731 int empty_lost_and_found;
1732 int empty_lost_and_found_overridden;
1735 #define MAX_OPT_LEN 30
1736 static int yaffs_parse_options(struct yaffs_options *options,
1737 const char *options_str)
1739 char cur_opt[MAX_OPT_LEN + 1];
1743 /* Parse through the options which is a comma seperated list */
1745 while (options_str && *options_str && !error) {
1746 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1749 while (*options_str == ',')
1752 while (*options_str && *options_str != ',') {
1753 if (p < MAX_OPT_LEN) {
1754 cur_opt[p] = *options_str;
1760 if (!strcmp(cur_opt, "inband-tags")) {
1761 options->inband_tags = 1;
1762 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
1763 options->tags_ecc_on = 0;
1764 options->tags_ecc_overridden = 1;
1765 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
1766 options->tags_ecc_on = 1;
1767 options->tags_ecc_overridden = 1;
1768 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
1769 options->lazy_loading_enabled = 0;
1770 options->lazy_loading_overridden = 1;
1771 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
1772 options->lazy_loading_enabled = 1;
1773 options->lazy_loading_overridden = 1;
1774 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
1775 options->empty_lost_and_found = 0;
1776 options->empty_lost_and_found_overridden = 1;
1777 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
1778 options->empty_lost_and_found = 1;
1779 options->empty_lost_and_found_overridden = 1;
1780 } else if (!strcmp(cur_opt, "no-cache")) {
1781 options->no_cache = 1;
1782 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
1783 options->skip_checkpoint_read = 1;
1784 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
1785 options->skip_checkpoint_write = 1;
1786 } else if (!strcmp(cur_opt, "no-checkpoint")) {
1787 options->skip_checkpoint_read = 1;
1788 options->skip_checkpoint_write = 1;
1790 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1798 static const struct address_space_operations yaffs_file_address_operations = {
1799 .readpage = yaffs_readpage,
1800 .writepage = yaffs_writepage,
1801 .write_begin = yaffs_write_begin,
1802 .write_end = yaffs_write_end,
1807 static const struct inode_operations yaffs_file_inode_operations = {
1808 .setattr = yaffs_setattr,
1809 #ifdef CONFIG_YAFFS_XATTR
1810 .setxattr = yaffs_setxattr,
1811 .getxattr = yaffs_getxattr,
1812 .listxattr = yaffs_listxattr,
1813 .removexattr = yaffs_removexattr,
1817 static const struct inode_operations yaffs_symlink_inode_operations = {
1818 .readlink = yaffs_readlink,
1819 .follow_link = yaffs_follow_link,
1820 .put_link = yaffs_put_link,
1821 .setattr = yaffs_setattr,
1822 #ifdef CONFIG_YAFFS_XATTR
1823 .setxattr = yaffs_setxattr,
1824 .getxattr = yaffs_getxattr,
1825 .listxattr = yaffs_listxattr,
1826 .removexattr = yaffs_removexattr,
1830 static void yaffs_fill_inode_from_obj(struct inode *inode,
1831 struct yaffs_obj *obj)
1834 /* Check mode against the variant type
1835 * and attempt to repair if broken. */
1836 u32 mode = obj->yst_mode;
1837 switch (obj->variant_type) {
1838 case YAFFS_OBJECT_TYPE_FILE:
1839 if (!S_ISREG(mode)) {
1840 obj->yst_mode &= ~S_IFMT;
1841 obj->yst_mode |= S_IFREG;
1845 case YAFFS_OBJECT_TYPE_SYMLINK:
1846 if (!S_ISLNK(mode)) {
1847 obj->yst_mode &= ~S_IFMT;
1848 obj->yst_mode |= S_IFLNK;
1852 case YAFFS_OBJECT_TYPE_DIRECTORY:
1853 if (!S_ISDIR(mode)) {
1854 obj->yst_mode &= ~S_IFMT;
1855 obj->yst_mode |= S_IFDIR;
1859 case YAFFS_OBJECT_TYPE_UNKNOWN:
1860 case YAFFS_OBJECT_TYPE_HARDLINK:
1861 case YAFFS_OBJECT_TYPE_SPECIAL:
1867 inode->i_flags |= S_NOATIME;
1869 inode->i_ino = obj->obj_id;
1870 inode->i_mode = obj->yst_mode;
1871 inode->i_uid = obj->yst_uid;
1872 inode->i_gid = obj->yst_gid;
1874 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1876 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1877 inode->i_atime.tv_nsec = 0;
1878 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1879 inode->i_mtime.tv_nsec = 0;
1880 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1881 inode->i_ctime.tv_nsec = 0;
1882 inode->i_size = yaffs_get_obj_length(obj);
1883 inode->i_blocks = (inode->i_size + 511) >> 9;
1885 inode->i_nlink = yaffs_get_obj_link_count(obj);
1887 yaffs_trace(YAFFS_TRACE_OS,
1888 "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1889 inode->i_mode, inode->i_uid, inode->i_gid,
1890 (int)inode->i_size, atomic_read(&inode->i_count));
1892 switch (obj->yst_mode & S_IFMT) {
1893 default: /* fifo, device or socket */
1894 init_special_inode(inode, obj->yst_mode,
1895 old_decode_dev(obj->yst_rdev));
1897 case S_IFREG: /* file */
1898 inode->i_op = &yaffs_file_inode_operations;
1899 inode->i_fop = &yaffs_file_operations;
1900 inode->i_mapping->a_ops =
1901 &yaffs_file_address_operations;
1903 case S_IFDIR: /* directory */
1904 inode->i_op = &yaffs_dir_inode_operations;
1905 inode->i_fop = &yaffs_dir_operations;
1907 case S_IFLNK: /* symlink */
1908 inode->i_op = &yaffs_symlink_inode_operations;
1912 yaffs_inode_to_obj_lv(inode) = obj;
1913 obj->my_inode = inode;
1916 yaffs_trace(YAFFS_TRACE_OS,
1917 "yaffs_fill_inode invalid parameters");
1921 static void yaffs_put_super(struct super_block *sb)
1923 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1925 yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
1927 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1928 "Shutting down yaffs background thread");
1930 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1931 "yaffs background thread shut down");
1933 yaffs_gross_lock(dev);
1935 yaffs_flush_super(sb, 1);
1937 if (yaffs_dev_to_lc(dev)->put_super_fn)
1938 yaffs_dev_to_lc(dev)->put_super_fn(sb);
1940 yaffs_deinitialise(dev);
1942 yaffs_gross_unlock(dev);
1943 mutex_lock(&yaffs_context_lock);
1944 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
1945 mutex_unlock(&yaffs_context_lock);
1947 if (yaffs_dev_to_lc(dev)->spare_buffer) {
1948 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
1949 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
1955 static void yaffs_mtd_put_super(struct super_block *sb)
1957 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
1962 put_mtd_device(mtd);
1965 static const struct super_operations yaffs_super_ops = {
1966 .statfs = yaffs_statfs,
1967 .put_super = yaffs_put_super,
1968 .evict_inode = yaffs_evict_inode,
1969 .sync_fs = yaffs_sync_fs,
1970 .write_super = yaffs_write_super,
1973 static struct super_block *yaffs_internal_read_super(int yaffs_version,
1974 struct super_block *sb,
1975 void *data, int silent)
1978 struct inode *inode = NULL;
1979 struct dentry *root;
1980 struct yaffs_dev *dev = 0;
1981 char devname_buf[BDEVNAME_SIZE + 1];
1982 struct mtd_info *mtd;
1984 char *data_str = (char *)data;
1985 struct yaffs_linux_context *context = NULL;
1986 struct yaffs_param *param;
1988 struct yaffs_options options;
1991 struct yaffs_linux_context *context_iterator;
1992 struct list_head *l;
1995 printk(KERN_INFO "yaffs: sb is NULL\n");
1999 sb->s_magic = YAFFS_MAGIC;
2000 sb->s_op = &yaffs_super_ops;
2001 sb->s_flags |= MS_NOATIME;
2003 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2005 sb->s_export_op = &yaffs_export_ops;
2008 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2009 else if (!yaffs_devname(sb, devname_buf))
2010 printk(KERN_INFO "yaffs: devname is NULL\n");
2012 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2014 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2019 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2021 memset(&options, 0, sizeof(options));
2023 if (yaffs_parse_options(&options, data_str)) {
2024 /* Option parsing failed */
2028 sb->s_blocksize = PAGE_CACHE_SIZE;
2029 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2031 yaffs_trace(YAFFS_TRACE_OS,
2032 "yaffs_read_super: Using yaffs%d", yaffs_version);
2033 yaffs_trace(YAFFS_TRACE_OS,
2034 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2036 yaffs_trace(YAFFS_TRACE_ALWAYS,
2037 "Attempting MTD mount of %u.%u,\"%s\"",
2038 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2039 yaffs_devname(sb, devname_buf));
2041 /* Check it's an mtd device..... */
2042 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2043 return NULL; /* This isn't an mtd device */
2045 /* Get the device */
2046 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2048 yaffs_trace(YAFFS_TRACE_ALWAYS,
2049 "MTD device #%u doesn't appear to exist",
2053 /* Check it's NAND */
2054 if (mtd->type != MTD_NANDFLASH) {
2055 yaffs_trace(YAFFS_TRACE_ALWAYS,
2056 "MTD device is not NAND it's type %d",
2061 yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2062 yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2063 yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2064 yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2065 yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2066 yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2067 yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2068 yaffs_trace(YAFFS_TRACE_OS, " writesize %d", mtd->writesize);
2069 yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2070 yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2071 yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2073 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2075 if (yaffs_version == 1 && mtd->writesize >= 2048) {
2076 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2080 /* Added NCB 26/5/2006 for completeness */
2081 if (yaffs_version == 2 && !options.inband_tags &&
2082 mtd->writesize == 512) {
2083 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2088 if (yaffs_version == 2) {
2089 /* Check for version 2 style functions */
2091 !mtd->block_isbad ||
2092 !mtd->block_markbad ||
2094 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2095 yaffs_trace(YAFFS_TRACE_ALWAYS,
2096 "MTD device does not support required functions");
2100 if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2101 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2102 !options.inband_tags) {
2103 yaffs_trace(YAFFS_TRACE_ALWAYS,
2104 "MTD device does not have the right page sizes");
2108 /* Check for V1 style functions */
2111 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2112 yaffs_trace(YAFFS_TRACE_ALWAYS,
2113 "MTD device does not support required functions");
2117 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
2118 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2119 yaffs_trace(YAFFS_TRACE_ALWAYS,
2120 "MTD device does not support have the right page sizes");
2125 /* OK, so if we got here, we have an MTD that's NAND and looks
2126 * like it has the right capabilities
2127 * Set the struct yaffs_dev up for mtd
2130 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2133 "yaffs: mtd is read only, setting superblock read only");
2134 sb->s_flags |= MS_RDONLY;
2137 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2138 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2140 if (!dev || !context) {
2148 /* Deep shit could not allocate device structure */
2149 yaffs_trace(YAFFS_TRACE_ALWAYS,
2150 "yaffs_read_super failed trying to allocate yaffs_dev");
2153 memset(dev, 0, sizeof(struct yaffs_dev));
2154 param = &(dev->param);
2156 memset(context, 0, sizeof(struct yaffs_linux_context));
2157 dev->os_context = context;
2158 INIT_LIST_HEAD(&(context->context_list));
2160 context->super = sb;
2162 dev->read_only = read_only;
2164 sb->s_fs_info = dev;
2166 dev->driver_context = mtd;
2167 param->name = mtd->name;
2169 /* Set up the memory size parameters.... */
2172 YCALCBLOCKS(mtd->size,
2173 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2175 param->start_block = 0;
2176 param->end_block = n_blocks - 1;
2177 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2178 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2179 param->n_reserved_blocks = 5;
2180 param->n_caches = (options.no_cache) ? 0 : 10;
2181 param->inband_tags = options.inband_tags;
2183 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2184 param->disable_lazy_load = 1;
2186 #ifdef CONFIG_YAFFS_XATTR
2187 param->enable_xattr = 1;
2189 if (options.lazy_loading_overridden)
2190 param->disable_lazy_load = !options.lazy_loading_enabled;
2192 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2193 param->no_tags_ecc = 1;
2196 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2198 param->defered_dir_update = 1;
2201 if (options.tags_ecc_overridden)
2202 param->no_tags_ecc = !options.tags_ecc_on;
2204 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2205 param->empty_lost_n_found = 1;
2208 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2209 param->refresh_period = 0;
2211 param->refresh_period = 500;
2214 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2215 param->always_check_erased = 1;
2218 if (options.empty_lost_and_found_overridden)
2219 param->empty_lost_n_found = options.empty_lost_and_found;
2221 /* ... and the functions. */
2222 if (yaffs_version == 2) {
2223 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2224 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2225 param->bad_block_fn = nandmtd2_mark_block_bad;
2226 param->query_block_fn = nandmtd2_query_block;
2227 yaffs_dev_to_lc(dev)->spare_buffer =
2228 kmalloc(mtd->oobsize, GFP_NOFS);
2229 param->is_yaffs2 = 1;
2230 param->total_bytes_per_chunk = mtd->writesize;
2231 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2232 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2234 param->start_block = 0;
2235 param->end_block = n_blocks - 1;
2237 /* use the MTD interface in yaffs_mtdif1.c */
2238 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2239 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2240 param->bad_block_fn = nandmtd1_mark_block_bad;
2241 param->query_block_fn = nandmtd1_query_block;
2242 param->is_yaffs2 = 0;
2244 /* ... and common functions */
2245 param->erase_fn = nandmtd_erase_block;
2246 param->initialise_flash_fn = nandmtd_initialise;
2248 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2250 param->sb_dirty_fn = yaffs_touch_super;
2251 param->gc_control = yaffs_gc_control_callback;
2253 yaffs_dev_to_lc(dev)->super = sb;
2255 #ifndef CONFIG_YAFFS_DOES_ECC
2256 param->use_nand_ecc = 1;
2259 param->skip_checkpt_rd = options.skip_checkpoint_read;
2260 param->skip_checkpt_wr = options.skip_checkpoint_write;
2262 mutex_lock(&yaffs_context_lock);
2263 /* Get a mount id */
2265 for (mount_id = 0; !found; mount_id++) {
2267 list_for_each(l, &yaffs_context_list) {
2269 list_entry(l, struct yaffs_linux_context,
2271 if (context_iterator->mount_id == mount_id)
2275 context->mount_id = mount_id;
2277 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2278 &yaffs_context_list);
2279 mutex_unlock(&yaffs_context_lock);
2281 /* Directory search handling... */
2282 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2283 param->remove_obj_fn = yaffs_remove_obj_callback;
2285 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2287 yaffs_gross_lock(dev);
2289 err = yaffs_guts_initialise(dev);
2291 yaffs_trace(YAFFS_TRACE_OS,
2292 "yaffs_read_super: guts initialised %s",
2293 (err == YAFFS_OK) ? "OK" : "FAILED");
2295 if (err == YAFFS_OK)
2296 yaffs_bg_start(dev);
2298 if (!context->bg_thread)
2299 param->defered_dir_update = 0;
2301 /* Release lock before yaffs_get_inode() */
2302 yaffs_gross_unlock(dev);
2304 /* Create root inode */
2305 if (err == YAFFS_OK)
2306 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2311 inode->i_op = &yaffs_dir_inode_operations;
2312 inode->i_fop = &yaffs_dir_operations;
2314 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2316 root = d_alloc_root(inode);
2318 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2325 sb->s_dirt = !dev->is_checkpointed;
2326 yaffs_trace(YAFFS_TRACE_ALWAYS,
2327 "yaffs_read_super: is_checkpointed %d",
2328 dev->is_checkpointed);
2330 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2334 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2337 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2340 static int yaffs_read_super(struct file_system_type *fs,
2341 int flags, const char *dev_name,
2342 void *data, struct vfsmount *mnt)
2345 return get_sb_bdev(fs, flags, dev_name, data,
2346 yaffs_internal_read_super_mtd, mnt);
2349 static struct file_system_type yaffs_fs_type = {
2350 .owner = THIS_MODULE,
2352 .get_sb = yaffs_read_super,
2353 .kill_sb = kill_block_super,
2354 .fs_flags = FS_REQUIRES_DEV,
2357 #ifdef CONFIG_YAFFS_YAFFS2
2359 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2362 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2365 static int yaffs2_read_super(struct file_system_type *fs,
2366 int flags, const char *dev_name, void *data,
2367 struct vfsmount *mnt)
2369 return get_sb_bdev(fs, flags, dev_name, data,
2370 yaffs2_internal_read_super_mtd, mnt);
2373 static struct file_system_type yaffs2_fs_type = {
2374 .owner = THIS_MODULE,
2376 .get_sb = yaffs2_read_super,
2377 .kill_sb = kill_block_super,
2378 .fs_flags = FS_REQUIRES_DEV,
2380 #endif /* CONFIG_YAFFS_YAFFS2 */
2382 static struct proc_dir_entry *my_proc_entry;
2384 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
2386 struct yaffs_param *param = &dev->param;
2388 buf += sprintf(buf, "start_block........... %d\n", param->start_block);
2389 buf += sprintf(buf, "end_block............. %d\n", param->end_block);
2390 buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
2391 param->total_bytes_per_chunk);
2392 buf += sprintf(buf, "use_nand_ecc.......... %d\n",
2393 param->use_nand_ecc);
2394 buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
2395 buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
2396 buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
2397 buf += sprintf(buf, "empty_lost_n_found.... %d\n",
2398 param->empty_lost_n_found);
2399 buf += sprintf(buf, "disable_lazy_load..... %d\n",
2400 param->disable_lazy_load);
2401 buf += sprintf(buf, "refresh_period........ %d\n",
2402 param->refresh_period);
2403 buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
2404 buf += sprintf(buf, "n_reserved_blocks..... %d\n",
2405 param->n_reserved_blocks);
2406 buf += sprintf(buf, "always_check_erased... %d\n",
2407 param->always_check_erased);
2412 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
2415 sprintf(buf, "data_bytes_per_chunk.. %d\n",
2416 dev->data_bytes_per_chunk);
2417 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2418 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2420 sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2422 sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2423 buf += sprintf(buf, "\n");
2424 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2425 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2426 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2427 buf += sprintf(buf, "\n");
2428 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2429 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2430 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2431 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2432 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2434 sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2436 sprintf(buf, "oldest_dirty_gc_count. %u\n",
2437 dev->oldest_dirty_gc_count);
2438 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2439 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2441 sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
2443 sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2444 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2445 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2447 sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2449 sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
2450 dev->n_tags_ecc_unfixed);
2451 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2453 sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2455 sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2456 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2457 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2462 static int yaffs_proc_read(char *page,
2464 off_t offset, int count, int *eof, void *data)
2466 struct list_head *item;
2471 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2472 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2473 * This also assumes the user has posted a read buffer large
2474 * enough to hold the complete output; but that's life in /proc.
2479 /* Print header first */
2481 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
2483 buf += sprintf(buf, "\n");
2487 mutex_lock(&yaffs_context_lock);
2489 /* Locate and print the Nth entry.
2490 * Order N-squared but N is small. */
2491 list_for_each(item, &yaffs_context_list) {
2492 struct yaffs_linux_context *dc =
2493 list_entry(item, struct yaffs_linux_context,
2495 struct yaffs_dev *dev = dc->dev;
2497 if (n < (step & ~1)) {
2501 if ((step & 1) == 0) {
2503 sprintf(buf, "\nDevice %d \"%s\"\n", n,
2505 buf = yaffs_dump_dev_part0(buf, dev);
2507 buf = yaffs_dump_dev_part1(buf, dev);
2512 mutex_unlock(&yaffs_context_lock);
2515 return buf - page < count ? buf - page : count;
2520 * Set the verbosity of the warnings and error messages.
2522 * Note that the names can only be a..z or _ with the current code.
2527 unsigned mask_bitfield;
2529 {"allocate", YAFFS_TRACE_ALLOCATE},
2530 {"always", YAFFS_TRACE_ALWAYS},
2531 {"background", YAFFS_TRACE_BACKGROUND},
2532 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2533 {"buffers", YAFFS_TRACE_BUFFERS},
2534 {"bug", YAFFS_TRACE_BUG},
2535 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2536 {"deletion", YAFFS_TRACE_DELETION},
2537 {"erase", YAFFS_TRACE_ERASE},
2538 {"error", YAFFS_TRACE_ERROR},
2539 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2540 {"gc", YAFFS_TRACE_GC},
2541 {"lock", YAFFS_TRACE_LOCK},
2542 {"mtd", YAFFS_TRACE_MTD},
2543 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2544 {"os", YAFFS_TRACE_OS},
2545 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2546 {"scan", YAFFS_TRACE_SCAN},
2547 {"mount", YAFFS_TRACE_MOUNT},
2548 {"tracing", YAFFS_TRACE_TRACING},
2549 {"sync", YAFFS_TRACE_SYNC},
2550 {"write", YAFFS_TRACE_WRITE},
2551 {"verify", YAFFS_TRACE_VERIFY},
2552 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2553 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2554 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2555 {"all", 0xffffffff},
2560 #define MAX_MASK_NAME_LENGTH 40
2561 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
2562 unsigned long count, void *data)
2564 unsigned rg = 0, mask_bitfield;
2568 char substring[MAX_MASK_NAME_LENGTH + 1];
2574 rg = yaffs_trace_mask;
2576 while (!done && (pos < count)) {
2578 while ((pos < count) && isspace(buf[pos]))
2595 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2597 if (end > buf + pos) {
2598 mask_name = "numeral";
2599 len = end - (buf + pos);
2603 for (x = buf + pos, i = 0;
2604 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2605 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2607 substring[i] = '\0';
2609 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2610 if (strcmp(substring, mask_flags[i].mask_name)
2612 mask_name = mask_flags[i].mask_name;
2614 mask_flags[i].mask_bitfield;
2621 if (mask_name != NULL) {
2625 rg &= ~mask_bitfield;
2628 rg |= mask_bitfield;
2634 rg |= mask_bitfield;
2640 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
2642 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
2644 if (rg & YAFFS_TRACE_ALWAYS) {
2645 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2647 flag = ((rg & mask_flags[i].mask_bitfield) ==
2648 mask_flags[i].mask_bitfield) ? '+' : '-';
2649 printk(KERN_DEBUG "%c%s\n", flag,
2650 mask_flags[i].mask_name);
2657 static int yaffs_proc_write(struct file *file, const char *buf,
2658 unsigned long count, void *data)
2660 return yaffs_proc_write_trace_options(file, buf, count, data);
2663 /* Stuff to handle installation of file systems */
2664 struct file_system_to_install {
2665 struct file_system_type *fst;
2669 static struct file_system_to_install fs_to_install[] = {
2670 {&yaffs_fs_type, 0},
2671 {&yaffs2_fs_type, 0},
2675 static int __init init_yaffs_fs(void)
2678 struct file_system_to_install *fsinst;
2680 yaffs_trace(YAFFS_TRACE_ALWAYS,
2681 "yaffs built " __DATE__ " " __TIME__ " Installing.");
2683 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2684 yaffs_trace(YAFFS_TRACE_ALWAYS,
2685 "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
2688 mutex_init(&yaffs_context_lock);
2690 /* Install the proc_fs entries */
2691 my_proc_entry = create_proc_entry("yaffs",
2692 S_IRUGO | S_IFREG, NULL);
2694 if (my_proc_entry) {
2695 my_proc_entry->write_proc = yaffs_proc_write;
2696 my_proc_entry->read_proc = yaffs_proc_read;
2697 my_proc_entry->data = NULL;
2703 /* Now add the file system entries */
2705 fsinst = fs_to_install;
2707 while (fsinst->fst && !error) {
2708 error = register_filesystem(fsinst->fst);
2710 fsinst->installed = 1;
2714 /* Any errors? uninstall */
2716 fsinst = fs_to_install;
2718 while (fsinst->fst) {
2719 if (fsinst->installed) {
2720 unregister_filesystem(fsinst->fst);
2721 fsinst->installed = 0;
2730 static void __exit exit_yaffs_fs(void)
2733 struct file_system_to_install *fsinst;
2735 yaffs_trace(YAFFS_TRACE_ALWAYS,
2736 "yaffs built " __DATE__ " " __TIME__ " removing.");
2738 remove_proc_entry("yaffs", NULL);
2740 fsinst = fs_to_install;
2742 while (fsinst->fst) {
2743 if (fsinst->installed) {
2744 unregister_filesystem(fsinst->fst);
2745 fsinst->installed = 0;
2751 module_init(init_yaffs_fs)
2752 module_exit(exit_yaffs_fs)
2754 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2755 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
2756 MODULE_LICENSE("GPL");