2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 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: could not get parent object");
210 yaffs_trace(YAFFS_TRACE_OS,
211 "yaffs_mknod: parent object %d type %d",
212 parent->obj_id, parent->variant_type);
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 if (yaffs_get_n_free_chunks(dev) < 1) {
227 switch (mode & S_IFMT) {
229 /* Special (socket, fifo, device...) */
230 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
232 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
233 gid, old_encode_dev(rdev));
235 case S_IFREG: /* file */
236 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
237 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
240 case S_IFDIR: /* directory */
241 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
242 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
245 case S_IFLNK: /* symlink */
246 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
247 obj = NULL; /* Do we ever get here? */
256 /* Can not call yaffs_get_inode() with gross lock held */
257 yaffs_gross_unlock(dev);
260 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
261 d_instantiate(dentry, inode);
262 update_dir_time(dir);
263 yaffs_trace(YAFFS_TRACE_OS,
264 "yaffs_mknod created object %d count = %d",
265 obj->obj_id, atomic_read(&inode->i_count));
266 yaffs_fill_inode_from_obj(dir, parent);
270 yaffs_gross_unlock(dev);
271 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod error %d", error);
276 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
278 return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
281 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
284 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
287 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
288 struct dentry *dentry)
290 struct inode *inode = old_dentry->d_inode;
291 struct yaffs_obj *obj = NULL;
292 struct yaffs_obj *link = NULL;
293 struct yaffs_dev *dev;
295 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
297 obj = yaffs_inode_to_obj(inode);
300 yaffs_gross_lock(dev);
302 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
304 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
308 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
309 d_instantiate(dentry, old_dentry->d_inode);
310 atomic_inc(&old_dentry->d_inode->i_count);
311 yaffs_trace(YAFFS_TRACE_OS,
312 "yaffs_link link count %d i_count %d",
313 old_dentry->d_inode->i_nlink,
314 atomic_read(&old_dentry->d_inode->i_count));
317 yaffs_gross_unlock(dev);
320 update_dir_time(dir);
327 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
330 struct yaffs_obj *obj;
331 struct yaffs_dev *dev;
333 uid_t uid = current->cred->fsuid;
335 (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
337 yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
339 dev = yaffs_inode_to_obj(dir)->my_dev;
340 yaffs_gross_lock(dev);
341 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
342 S_IFLNK | S_IRWXUGO, uid, gid, symname);
343 yaffs_gross_unlock(dev);
346 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
350 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
351 d_instantiate(dentry, inode);
352 update_dir_time(dir);
353 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
358 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
361 struct yaffs_obj *obj;
362 struct inode *inode = NULL;
363 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
365 if (current != yaffs_dev_to_lc(dev)->readdir_process)
366 yaffs_gross_lock(dev);
368 yaffs_trace(YAFFS_TRACE_OS,
369 "yaffs_lookup for %d:%s",
370 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
372 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
374 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
376 /* Can't hold gross lock when calling yaffs_get_inode() */
377 if (current != yaffs_dev_to_lc(dev)->readdir_process)
378 yaffs_gross_unlock(dev);
381 yaffs_trace(YAFFS_TRACE_OS,
382 "yaffs_lookup found %d", obj->obj_id);
384 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
387 yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
388 d_add(dentry, inode);
394 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
398 d_add(dentry, inode);
403 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
406 struct yaffs_dev *dev;
407 struct yaffs_obj *obj;
409 yaffs_trace(YAFFS_TRACE_OS,
410 "yaffs_unlink %d:%s",
411 (int)(dir->i_ino), dentry->d_name.name);
412 obj = yaffs_inode_to_obj(dir);
415 yaffs_gross_lock(dev);
417 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
419 if (ret_val == YAFFS_OK) {
420 dentry->d_inode->i_nlink--;
422 yaffs_gross_unlock(dev);
423 mark_inode_dirty(dentry->d_inode);
424 update_dir_time(dir);
427 yaffs_gross_unlock(dev);
431 static int yaffs_sync_object(struct file *file, int datasync)
434 struct yaffs_obj *obj;
435 struct yaffs_dev *dev;
436 struct dentry *dentry = file->f_path.dentry;
438 obj = yaffs_dentry_to_obj(dentry);
442 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
443 yaffs_gross_lock(dev);
444 yaffs_flush_file(obj, 1, datasync);
445 yaffs_gross_unlock(dev);
449 * The VFS layer already does all the dentry stuff for rename.
451 * NB: POSIX says you can rename an object over an old object of the same name
453 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
454 struct inode *new_dir, struct dentry *new_dentry)
456 struct yaffs_dev *dev;
457 int ret_val = YAFFS_FAIL;
458 struct yaffs_obj *target;
460 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
461 dev = yaffs_inode_to_obj(old_dir)->my_dev;
463 yaffs_gross_lock(dev);
465 /* Check if the target is an existing directory that is not empty. */
466 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
467 new_dentry->d_name.name);
469 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
470 !list_empty(&target->variant.dir_variant.children)) {
472 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
474 ret_val = YAFFS_FAIL;
476 /* Now does unlinking internally using shadowing mechanism */
477 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
479 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
480 old_dentry->d_name.name,
481 yaffs_inode_to_obj(new_dir),
482 new_dentry->d_name.name);
484 yaffs_gross_unlock(dev);
486 if (ret_val == YAFFS_OK) {
488 new_dentry->d_inode->i_nlink--;
489 mark_inode_dirty(new_dentry->d_inode);
492 update_dir_time(old_dir);
493 if (old_dir != new_dir)
494 update_dir_time(new_dir);
501 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
503 struct inode *inode = dentry->d_inode;
505 struct yaffs_dev *dev;
508 yaffs_trace(YAFFS_TRACE_OS,
509 "yaffs_setattr of object %d",
510 yaffs_inode_to_obj(inode)->obj_id);
512 /* Fail if a requested resize >= 2GB */
513 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
517 error = inode_change_ok(inode, attr);
520 setattr_copy(inode, attr);
521 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
522 if (attr->ia_valid & ATTR_SIZE) {
523 truncate_setsize(inode, attr->ia_size);
524 inode->i_blocks = (inode->i_size + 511) >> 9;
526 dev = yaffs_inode_to_obj(inode)->my_dev;
527 if (attr->ia_valid & ATTR_SIZE) {
528 yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
529 (int)(attr->ia_size),
530 (int)(attr->ia_size));
533 yaffs_gross_lock(dev);
534 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
535 if (result != YAFFS_OK)
537 yaffs_gross_unlock(dev);
540 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
545 #ifdef CONFIG_YAFFS_XATTR
546 static int yaffs_setxattr(struct dentry *dentry, const char *name,
547 const void *value, size_t size, int flags)
549 struct inode *inode = dentry->d_inode;
551 struct yaffs_dev *dev;
552 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
554 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
557 yaffs_gross_lock(dev);
558 error = yaffs_set_xattrib(obj, name, value, size, flags);
559 yaffs_gross_unlock(dev);
561 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
566 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
567 void *buff, size_t size)
569 struct inode *inode = dentry->d_inode;
571 struct yaffs_dev *dev;
572 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
574 yaffs_trace(YAFFS_TRACE_OS,
575 "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);
599 yaffs_gross_lock(dev);
600 error = yaffs_remove_xattrib(obj, name);
601 yaffs_gross_unlock(dev);
603 yaffs_trace(YAFFS_TRACE_OS,
604 "yaffs_removexattr done returning %d", error);
609 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
611 struct inode *inode = dentry->d_inode;
613 struct yaffs_dev *dev;
614 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
616 yaffs_trace(YAFFS_TRACE_OS,
617 "yaffs_listxattr of object %d", obj->obj_id);
620 yaffs_gross_lock(dev);
621 error = yaffs_list_xattrib(obj, buff, size);
622 yaffs_gross_unlock(dev);
624 yaffs_trace(YAFFS_TRACE_OS,
625 "yaffs_listxattr done returning %d", error);
632 static const struct inode_operations yaffs_dir_inode_operations = {
633 .create = yaffs_create,
634 .lookup = yaffs_lookup,
636 .unlink = yaffs_unlink,
637 .symlink = yaffs_symlink,
638 .mkdir = yaffs_mkdir,
639 .rmdir = yaffs_unlink,
640 .mknod = yaffs_mknod,
641 .rename = yaffs_rename,
642 .setattr = yaffs_setattr,
643 #ifdef CONFIG_YAFFS_XATTR
644 .setxattr = yaffs_setxattr,
645 .getxattr = yaffs_getxattr,
646 .listxattr = yaffs_listxattr,
647 .removexattr = yaffs_removexattr,
650 /*-----------------------------------------------------------------*/
651 /* Directory search context allows us to unlock access to yaffs during
652 * filldir without causing problems with the directory being modified.
653 * This is similar to the tried and tested mechanism used in yaffs direct.
655 * A search context iterates along a doubly linked list of siblings in the
656 * directory. If the iterating object is deleted then this would corrupt
657 * the list iteration, likely causing a crash. The search context avoids
658 * this by using the remove_obj_fn to move the search context to the
659 * next object before the object is deleted.
661 * Many readdirs (and thus seach conexts) may be alive simulateously so
662 * each struct yaffs_dev has a list of these.
664 * A seach context lives for the duration of a readdir.
666 * All these functions must be called while yaffs is locked.
669 struct yaffs_search_context {
670 struct yaffs_dev *dev;
671 struct yaffs_obj *dir_obj;
672 struct yaffs_obj *next_return;
673 struct list_head others;
677 * yaffs_new_search() creates a new search context, initialises it and
678 * adds it to the device's search context list.
680 * Called at start of readdir.
682 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
684 struct yaffs_dev *dev = dir->my_dev;
685 struct yaffs_search_context *sc =
686 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
693 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
694 sc->next_return = NULL;
697 list_entry(dir->variant.dir_variant.children.next,
698 struct yaffs_obj, siblings);
699 INIT_LIST_HEAD(&sc->others);
700 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
706 * yaffs_search_end() disposes of a search context and cleans up.
708 static void yaffs_search_end(struct yaffs_search_context *sc)
711 list_del(&sc->others);
717 * yaffs_search_advance() moves a search context to the next object.
718 * Called when the search iterates or when an object removal causes
719 * the search context to be moved to the next object.
721 static void yaffs_search_advance(struct yaffs_search_context *sc)
726 if (sc->next_return == NULL ||
727 list_empty(&sc->dir_obj->variant.dir_variant.children))
728 sc->next_return = NULL;
730 struct list_head *next = sc->next_return->siblings.next;
732 if (next == &sc->dir_obj->variant.dir_variant.children)
733 sc->next_return = NULL; /* end of list */
736 list_entry(next, struct yaffs_obj, siblings);
741 * yaffs_remove_obj_callback() is called when an object is unlinked.
742 * We check open search contexts and advance any which are currently
743 * on the object being iterated.
745 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
749 struct yaffs_search_context *sc;
750 struct list_head *search_contexts =
751 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
753 /* Iterate through the directory search contexts.
754 * If any are currently on the object being removed, then advance
755 * the search context to the next object to prevent a hanging pointer.
757 list_for_each(i, search_contexts) {
758 sc = list_entry(i, struct yaffs_search_context, others);
759 if (sc->next_return == obj)
760 yaffs_search_advance(sc);
765 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
767 struct yaffs_obj *obj;
768 struct yaffs_dev *dev;
769 struct yaffs_search_context *sc;
770 struct inode *inode = f->f_dentry->d_inode;
771 unsigned long offset, curoffs;
774 char name[YAFFS_MAX_NAME_LENGTH + 1];
776 obj = yaffs_dentry_to_obj(f->f_dentry);
779 yaffs_gross_lock(dev);
781 yaffs_dev_to_lc(dev)->readdir_process = current;
785 sc = yaffs_new_search(obj);
791 yaffs_trace(YAFFS_TRACE_OS,
792 "yaffs_readdir: starting at %d", (int)offset);
795 yaffs_trace(YAFFS_TRACE_OS,
796 "yaffs_readdir: entry . ino %d",
798 yaffs_gross_unlock(dev);
799 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
800 yaffs_gross_lock(dev);
803 yaffs_gross_lock(dev);
808 yaffs_trace(YAFFS_TRACE_OS,
809 "yaffs_readdir: entry .. ino %d",
810 (int)f->f_dentry->d_parent->d_inode->i_ino);
811 yaffs_gross_unlock(dev);
812 if (filldir(dirent, "..", 2, offset,
813 f->f_dentry->d_parent->d_inode->i_ino,
815 yaffs_gross_lock(dev);
818 yaffs_gross_lock(dev);
825 /* If the directory has changed since the open or last call to
826 readdir, rewind to after the 2 canned entries. */
827 if (f->f_version != inode->i_version) {
830 f->f_version = inode->i_version;
833 while (sc->next_return) {
836 if (curoffs >= offset) {
837 int this_inode = yaffs_get_obj_inode(l);
838 int this_type = yaffs_get_obj_type(l);
840 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
841 yaffs_trace(YAFFS_TRACE_OS,
842 "yaffs_readdir: %s inode %d",
843 name, yaffs_get_obj_inode(l));
845 yaffs_gross_unlock(dev);
850 offset, this_inode, this_type) < 0) {
851 yaffs_gross_lock(dev);
855 yaffs_gross_lock(dev);
860 yaffs_search_advance(sc);
864 yaffs_search_end(sc);
865 yaffs_dev_to_lc(dev)->readdir_process = NULL;
866 yaffs_gross_unlock(dev);
871 static const struct file_operations yaffs_dir_operations = {
872 .read = generic_read_dir,
873 .readdir = yaffs_readdir,
874 .fsync = yaffs_sync_object,
875 .llseek = generic_file_llseek,
880 static int yaffs_file_flush(struct file *file, fl_owner_t id)
882 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
883 struct yaffs_dev *dev = obj->my_dev;
885 yaffs_trace(YAFFS_TRACE_OS,
886 "yaffs_file_flush object %d (%s)",
887 obj->obj_id, obj->dirty ? "dirty" : "clean");
889 yaffs_gross_lock(dev);
891 yaffs_flush_file(obj, 1, 0);
893 yaffs_gross_unlock(dev);
898 static const struct file_operations yaffs_file_operations = {
899 .read = do_sync_read,
900 .write = do_sync_write,
901 .aio_read = generic_file_aio_read,
902 .aio_write = generic_file_aio_write,
903 .mmap = generic_file_mmap,
904 .flush = yaffs_file_flush,
905 .fsync = yaffs_sync_object,
906 .splice_read = generic_file_splice_read,
907 .splice_write = generic_file_splice_write,
908 .llseek = generic_file_llseek,
912 /* ExportFS support */
913 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
916 return yaffs_iget(sb, ino);
919 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
920 struct fid *fid, int fh_len,
923 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
924 yaffs2_nfs_get_inode);
927 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
928 struct fid *fid, int fh_len,
931 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
932 yaffs2_nfs_get_inode);
935 struct dentry *yaffs2_get_parent(struct dentry *dentry)
938 struct super_block *sb = dentry->d_inode->i_sb;
939 struct dentry *parent = ERR_PTR(-ENOENT);
941 unsigned long parent_ino;
942 struct yaffs_obj *d_obj;
943 struct yaffs_obj *parent_obj;
945 d_obj = yaffs_inode_to_obj(dentry->d_inode);
948 parent_obj = d_obj->parent;
950 parent_ino = yaffs_get_obj_inode(parent_obj);
951 inode = yaffs_iget(sb, parent_ino);
954 parent = ERR_CAST(inode);
956 parent = d_obtain_alias(inode);
957 if (!IS_ERR(parent)) {
958 parent = ERR_PTR(-ENOMEM);
967 /* Just declare a zero structure as a NULL value implies
968 * using the default functions of exportfs.
971 static struct export_operations yaffs_export_ops = {
972 .fh_to_dentry = yaffs2_fh_to_dentry,
973 .fh_to_parent = yaffs2_fh_to_parent,
974 .get_parent = yaffs2_get_parent,
978 /*-----------------------------------------------------------------*/
980 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
983 unsigned char *alias;
985 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
987 yaffs_gross_lock(dev);
989 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
991 yaffs_gross_unlock(dev);
996 ret = vfs_readlink(dentry, buffer, buflen, alias);
1001 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1003 unsigned char *alias;
1005 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1007 yaffs_gross_lock(dev);
1009 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1010 yaffs_gross_unlock(dev);
1013 ret = ERR_PTR(-ENOMEM);
1017 nd_set_link(nd, alias);
1018 ret = (void *)alias;
1023 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1029 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
1031 /* Clear the association between the inode and
1032 * the struct yaffs_obj.
1034 obj->my_inode = NULL;
1035 yaffs_inode_to_obj_lv(inode) = NULL;
1037 /* If the object freeing was deferred, then the real
1039 * This should fix the inode inconsistency problem.
1041 yaffs_handle_defered_free(obj);
1044 /* yaffs_evict_inode combines into one operation what was previously done in
1045 * yaffs_clear_inode() and yaffs_delete_inode()
1048 static void yaffs_evict_inode(struct inode *inode)
1050 struct yaffs_obj *obj;
1051 struct yaffs_dev *dev;
1054 obj = yaffs_inode_to_obj(inode);
1056 yaffs_trace(YAFFS_TRACE_OS,
1057 "yaffs_evict_inode: ino %d, count %d %s",
1059 atomic_read(&inode->i_count),
1060 obj ? "object exists" : "null object");
1062 if (!inode->i_nlink && !is_bad_inode(inode))
1064 truncate_inode_pages(&inode->i_data, 0);
1065 end_writeback(inode);
1067 if (deleteme && obj) {
1069 yaffs_gross_lock(dev);
1071 yaffs_gross_unlock(dev);
1075 yaffs_gross_lock(dev);
1076 yaffs_unstitch_obj(inode, obj);
1077 yaffs_gross_unlock(dev);
1082 static void yaffs_touch_super(struct yaffs_dev *dev)
1084 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
1086 yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
1091 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
1093 /* Lifted from jffs2 */
1095 struct yaffs_obj *obj;
1096 unsigned char *pg_buf;
1098 struct yaffs_dev *dev;
1100 yaffs_trace(YAFFS_TRACE_OS,
1101 "yaffs_readpage_nolock at %08x, size %08x",
1102 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
1103 (unsigned)PAGE_CACHE_SIZE);
1105 obj = yaffs_dentry_to_obj(f->f_dentry);
1109 BUG_ON(!PageLocked(pg));
1112 /* FIXME: Can kmap fail? */
1114 yaffs_gross_lock(dev);
1116 ret = yaffs_file_rd(obj, pg_buf,
1117 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1119 yaffs_gross_unlock(dev);
1125 ClearPageUptodate(pg);
1128 SetPageUptodate(pg);
1132 flush_dcache_page(pg);
1135 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1139 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1141 int ret = yaffs_readpage_nolock(f, pg);
1147 static int yaffs_readpage(struct file *f, struct page *pg)
1151 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1152 ret = yaffs_readpage_unlock(f, pg);
1153 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1157 /* writepage inspired by/stolen from smbfs */
1159 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1161 struct yaffs_dev *dev;
1162 struct address_space *mapping = page->mapping;
1163 struct inode *inode;
1164 unsigned long end_index;
1166 struct yaffs_obj *obj;
1173 inode = mapping->host;
1176 i_size = i_size_read(inode);
1178 end_index = i_size >> PAGE_CACHE_SHIFT;
1180 if (page->index < end_index)
1181 n_bytes = PAGE_CACHE_SIZE;
1183 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1185 if (page->index > end_index || !n_bytes) {
1186 yaffs_trace(YAFFS_TRACE_OS,
1187 "yaffs_writepage at %08x, inode size = %08x!!!",
1188 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1189 (unsigned)inode->i_size);
1190 yaffs_trace(YAFFS_TRACE_OS,
1191 " -> don't care!!");
1193 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1194 set_page_writeback(page);
1196 end_page_writeback(page);
1201 if (n_bytes != PAGE_CACHE_SIZE)
1202 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1206 buffer = kmap(page);
1208 obj = yaffs_inode_to_obj(inode);
1210 yaffs_gross_lock(dev);
1212 yaffs_trace(YAFFS_TRACE_OS,
1213 "yaffs_writepage at %08x, size %08x",
1214 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1215 yaffs_trace(YAFFS_TRACE_OS,
1216 "writepag0: obj = %05x, ino = %05x",
1217 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1219 n_written = yaffs_wr_file(obj, buffer,
1220 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1222 yaffs_touch_super(dev);
1224 yaffs_trace(YAFFS_TRACE_OS,
1225 "writepag1: obj = %05x, ino = %05x",
1226 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1228 yaffs_gross_unlock(dev);
1231 set_page_writeback(page);
1233 end_page_writeback(page);
1236 return (n_written == n_bytes) ? 0 : -ENOSPC;
1239 /* Space holding and freeing is done to ensure we have space available for
1241 * For now we just assume few parallel writes and check against a small
1243 * Todo: need to do this with a counter to handle parallel reads better
1246 static ssize_t yaffs_hold_space(struct file *f)
1248 struct yaffs_obj *obj;
1249 struct yaffs_dev *dev;
1252 obj = yaffs_dentry_to_obj(f->f_dentry);
1256 yaffs_gross_lock(dev);
1258 n_free_chunks = yaffs_get_n_free_chunks(dev);
1260 yaffs_gross_unlock(dev);
1262 return (n_free_chunks > 20) ? 1 : 0;
1265 static void yaffs_release_space(struct file *f)
1267 struct yaffs_obj *obj;
1268 struct yaffs_dev *dev;
1270 obj = yaffs_dentry_to_obj(f->f_dentry);
1274 yaffs_gross_lock(dev);
1276 yaffs_gross_unlock(dev);
1279 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1280 loff_t pos, unsigned len, unsigned flags,
1281 struct page **pagep, void **fsdata)
1283 struct page *pg = NULL;
1284 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1289 pg = grab_cache_page_write_begin(mapping, index, flags);
1296 yaffs_trace(YAFFS_TRACE_OS,
1297 "start yaffs_write_begin index %d(%x) uptodate %d",
1298 (int)index, (int)index, PageUptodate(pg) ? 1 : 0);
1301 space_held = yaffs_hold_space(filp);
1308 /* Update page if required */
1310 if (!PageUptodate(pg))
1311 ret = yaffs_readpage_nolock(filp, pg);
1316 /* Happy path return */
1317 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1322 yaffs_trace(YAFFS_TRACE_OS,
1323 "end yaffs_write_begin fail returning %d", ret);
1325 yaffs_release_space(filp);
1328 page_cache_release(pg);
1333 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1336 struct yaffs_obj *obj;
1337 int n_written, ipos;
1338 struct inode *inode;
1339 struct yaffs_dev *dev;
1341 obj = yaffs_dentry_to_obj(f->f_dentry);
1344 /* This should not happen */
1345 yaffs_trace(YAFFS_TRACE_OS,
1346 "yaffs_file_write: hey obj is null!");
1352 yaffs_gross_lock(dev);
1354 inode = f->f_dentry->d_inode;
1356 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1357 ipos = inode->i_size;
1361 yaffs_trace(YAFFS_TRACE_OS,
1362 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1363 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1365 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1367 yaffs_touch_super(dev);
1369 yaffs_trace(YAFFS_TRACE_OS,
1370 "yaffs_file_write: %d(%x) bytes written",
1371 (unsigned)n, (unsigned)n);
1373 if (n_written > 0) {
1376 if (ipos > inode->i_size) {
1377 inode->i_size = ipos;
1378 inode->i_blocks = (ipos + 511) >> 9;
1380 yaffs_trace(YAFFS_TRACE_OS,
1381 "yaffs_file_write size updated to %d bytes, %d blocks",
1382 ipos, (int)(inode->i_blocks));
1385 yaffs_gross_unlock(dev);
1386 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1389 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1390 loff_t pos, unsigned len, unsigned copied,
1391 struct page *pg, void *fsdadata)
1395 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1398 addr = kva + offset_into_page;
1400 yaffs_trace(YAFFS_TRACE_OS,
1401 "yaffs_write_end addr %p pos %x n_bytes %d",
1402 addr, (unsigned)pos, copied);
1404 ret = yaffs_file_write(filp, addr, copied, &pos);
1406 if (ret != copied) {
1407 yaffs_trace(YAFFS_TRACE_OS,
1408 "yaffs_write_end not same size ret %d copied %d",
1415 yaffs_release_space(filp);
1417 page_cache_release(pg);
1421 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1423 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1424 struct super_block *sb = dentry->d_sb;
1426 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
1428 yaffs_gross_lock(dev);
1430 buf->f_type = YAFFS_MAGIC;
1431 buf->f_bsize = sb->s_blocksize;
1432 buf->f_namelen = 255;
1434 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1435 /* Do this if chunk size is not a power of 2 */
1437 uint64_t bytes_in_dev;
1438 uint64_t bytes_free;
1442 ((dev->param.end_block - dev->param.start_block + 1))) *
1443 ((uint64_t) (dev->param.chunks_per_block *
1444 dev->data_bytes_per_chunk));
1446 do_div(bytes_in_dev, sb->s_blocksize);
1447 /* bytes_in_dev becomes the number of blocks */
1448 buf->f_blocks = bytes_in_dev;
1450 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
1451 ((uint64_t) (dev->data_bytes_per_chunk));
1453 do_div(bytes_free, sb->s_blocksize);
1455 buf->f_bfree = bytes_free;
1457 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1460 (dev->param.end_block - dev->param.start_block + 1) *
1461 dev->param.chunks_per_block /
1462 (sb->s_blocksize / dev->data_bytes_per_chunk);
1464 yaffs_get_n_free_chunks(dev) /
1465 (sb->s_blocksize / dev->data_bytes_per_chunk);
1468 (dev->param.end_block - dev->param.start_block + 1) *
1469 dev->param.chunks_per_block *
1470 (dev->data_bytes_per_chunk / sb->s_blocksize);
1473 yaffs_get_n_free_chunks(dev) *
1474 (dev->data_bytes_per_chunk / sb->s_blocksize);
1479 buf->f_bavail = buf->f_bfree;
1481 yaffs_gross_unlock(dev);
1485 static void yaffs_flush_inodes(struct super_block *sb)
1488 struct yaffs_obj *obj;
1490 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
1491 obj = yaffs_inode_to_obj(iptr);
1493 yaffs_trace(YAFFS_TRACE_OS,
1494 "flushing obj %d", obj->obj_id);
1495 yaffs_flush_file(obj, 1, 0);
1500 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1502 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1507 yaffs_flush_inodes(sb);
1508 yaffs_update_dirty_dirs(dev);
1509 yaffs_flush_whole_cache(dev);
1511 yaffs_checkpoint_save(dev);
1514 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1516 unsigned erased_chunks =
1517 dev->n_erased_blocks * dev->param.chunks_per_block;
1518 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1519 unsigned scattered = 0; /* Free chunks not in an erased block */
1521 if (erased_chunks < dev->n_free_chunks)
1522 scattered = (dev->n_free_chunks - erased_chunks);
1524 if (!context->bg_running)
1526 else if (scattered < (dev->param.chunks_per_block * 2))
1528 else if (erased_chunks > dev->n_free_chunks / 2)
1530 else if (erased_chunks > dev->n_free_chunks / 4)
1536 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
1539 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1540 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1541 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1544 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1545 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
1547 sb->s_dirt ? "dirty" : "clean",
1548 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1549 oneshot_checkpoint ? " one-shot" : "");
1551 yaffs_gross_lock(dev);
1552 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1553 oneshot_checkpoint) && !dev->is_checkpointed;
1555 if (sb->s_dirt || do_checkpoint) {
1556 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1558 if (oneshot_checkpoint)
1559 yaffs_auto_checkpoint &= ~4;
1561 yaffs_gross_unlock(dev);
1567 * yaffs background thread functions .
1568 * yaffs_bg_thread_fn() the thread function
1569 * yaffs_bg_start() launches the background thread.
1570 * yaffs_bg_stop() cleans up the background thread.
1573 * The thread should only run after the yaffs is initialised
1574 * The thread should be stopped before yaffs is unmounted.
1575 * The thread should not do any writing while the fs is in read only.
1578 void yaffs_background_waker(unsigned long data)
1580 wake_up_process((struct task_struct *)data);
1583 static int yaffs_bg_thread_fn(void *data)
1585 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1586 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1587 unsigned long now = jiffies;
1588 unsigned long next_dir_update = now;
1589 unsigned long next_gc = now;
1590 unsigned long expires;
1591 unsigned int urgency;
1593 struct timer_list timer;
1595 yaffs_trace(YAFFS_TRACE_BACKGROUND,
1596 "yaffs_background starting for dev %p", (void *)dev);
1599 while (context->bg_running) {
1600 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
1602 if (kthread_should_stop())
1605 if (try_to_freeze())
1608 yaffs_gross_lock(dev);
1612 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1613 yaffs_update_dirty_dirs(dev);
1614 next_dir_update = now + HZ;
1617 if (time_after(now, next_gc) && yaffs_bg_enable) {
1618 if (!dev->is_checkpointed) {
1619 urgency = yaffs_bg_gc_urgency(dev);
1620 gc_result = yaffs_bg_gc(dev, urgency);
1622 next_gc = now + HZ / 20 + 1;
1623 else if (urgency > 0)
1624 next_gc = now + HZ / 10 + 1;
1626 next_gc = now + HZ * 2;
1629 * gc not running so set to next_dir_update
1630 * to cut down on wake ups
1632 next_gc = next_dir_update;
1635 yaffs_gross_unlock(dev);
1636 expires = next_dir_update;
1637 if (time_before(next_gc, expires))
1639 if (time_before(expires, now))
1642 init_timer_on_stack(&timer);
1643 timer.expires = expires + 1;
1644 timer.data = (unsigned long)current;
1645 timer.function = yaffs_background_waker;
1647 set_current_state(TASK_INTERRUPTIBLE);
1650 del_timer_sync(&timer);
1656 static int yaffs_bg_start(struct yaffs_dev *dev)
1659 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1664 context->bg_running = 1;
1666 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1667 (void *)dev, "yaffs-bg-%d",
1670 if (IS_ERR(context->bg_thread)) {
1671 retval = PTR_ERR(context->bg_thread);
1672 context->bg_thread = NULL;
1673 context->bg_running = 0;
1678 static void yaffs_bg_stop(struct yaffs_dev *dev)
1680 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1682 ctxt->bg_running = 0;
1684 if (ctxt->bg_thread) {
1685 kthread_stop(ctxt->bg_thread);
1686 ctxt->bg_thread = NULL;
1690 static void yaffs_write_super(struct super_block *sb)
1692 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
1694 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1695 "yaffs_write_super%s",
1696 request_checkpoint ? " checkpt" : "");
1698 yaffs_do_sync_fs(sb, request_checkpoint);
1702 static int yaffs_sync_fs(struct super_block *sb, int wait)
1704 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
1706 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1707 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
1709 yaffs_do_sync_fs(sb, request_checkpoint);
1714 static LIST_HEAD(yaffs_context_list);
1715 struct mutex yaffs_context_lock;
1717 struct yaffs_options {
1719 int skip_checkpoint_read;
1720 int skip_checkpoint_write;
1723 int tags_ecc_overridden;
1724 int lazy_loading_enabled;
1725 int lazy_loading_overridden;
1726 int empty_lost_and_found;
1727 int empty_lost_and_found_overridden;
1730 #define MAX_OPT_LEN 30
1731 static int yaffs_parse_options(struct yaffs_options *options,
1732 const char *options_str)
1734 char cur_opt[MAX_OPT_LEN + 1];
1738 /* Parse through the options which is a comma seperated list */
1740 while (options_str && *options_str && !error) {
1741 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1744 while (*options_str == ',')
1747 while (*options_str && *options_str != ',') {
1748 if (p < MAX_OPT_LEN) {
1749 cur_opt[p] = *options_str;
1755 if (!strcmp(cur_opt, "inband-tags")) {
1756 options->inband_tags = 1;
1757 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
1758 options->tags_ecc_on = 0;
1759 options->tags_ecc_overridden = 1;
1760 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
1761 options->tags_ecc_on = 1;
1762 options->tags_ecc_overridden = 1;
1763 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
1764 options->lazy_loading_enabled = 0;
1765 options->lazy_loading_overridden = 1;
1766 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
1767 options->lazy_loading_enabled = 1;
1768 options->lazy_loading_overridden = 1;
1769 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
1770 options->empty_lost_and_found = 0;
1771 options->empty_lost_and_found_overridden = 1;
1772 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
1773 options->empty_lost_and_found = 1;
1774 options->empty_lost_and_found_overridden = 1;
1775 } else if (!strcmp(cur_opt, "no-cache")) {
1776 options->no_cache = 1;
1777 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
1778 options->skip_checkpoint_read = 1;
1779 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
1780 options->skip_checkpoint_write = 1;
1781 } else if (!strcmp(cur_opt, "no-checkpoint")) {
1782 options->skip_checkpoint_read = 1;
1783 options->skip_checkpoint_write = 1;
1785 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1793 static const struct address_space_operations yaffs_file_address_operations = {
1794 .readpage = yaffs_readpage,
1795 .writepage = yaffs_writepage,
1796 .write_begin = yaffs_write_begin,
1797 .write_end = yaffs_write_end,
1802 static const struct inode_operations yaffs_file_inode_operations = {
1803 .setattr = yaffs_setattr,
1804 #ifdef CONFIG_YAFFS_XATTR
1805 .setxattr = yaffs_setxattr,
1806 .getxattr = yaffs_getxattr,
1807 .listxattr = yaffs_listxattr,
1808 .removexattr = yaffs_removexattr,
1812 static const struct inode_operations yaffs_symlink_inode_operations = {
1813 .readlink = yaffs_readlink,
1814 .follow_link = yaffs_follow_link,
1815 .put_link = yaffs_put_link,
1816 .setattr = yaffs_setattr,
1817 #ifdef CONFIG_YAFFS_XATTR
1818 .setxattr = yaffs_setxattr,
1819 .getxattr = yaffs_getxattr,
1820 .listxattr = yaffs_listxattr,
1821 .removexattr = yaffs_removexattr,
1825 static void yaffs_fill_inode_from_obj(struct inode *inode,
1826 struct yaffs_obj *obj)
1830 if (!inode || !obj) {
1831 yaffs_trace(YAFFS_TRACE_OS,
1832 "yaffs_fill_inode invalid parameters");
1836 /* Check mode against the variant type
1837 * and attempt to repair if broken. */
1838 mode = obj->yst_mode;
1840 switch (obj->variant_type) {
1841 case YAFFS_OBJECT_TYPE_FILE:
1842 if (!S_ISREG(mode)) {
1843 obj->yst_mode &= ~S_IFMT;
1844 obj->yst_mode |= S_IFREG;
1847 case YAFFS_OBJECT_TYPE_SYMLINK:
1848 if (!S_ISLNK(mode)) {
1849 obj->yst_mode &= ~S_IFMT;
1850 obj->yst_mode |= S_IFLNK;
1853 case YAFFS_OBJECT_TYPE_DIRECTORY:
1854 if (!S_ISDIR(mode)) {
1855 obj->yst_mode &= ~S_IFMT;
1856 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;
1868 inode->i_ino = obj->obj_id;
1869 inode->i_mode = obj->yst_mode;
1870 inode->i_uid = obj->yst_uid;
1871 inode->i_gid = obj->yst_gid;
1873 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1875 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1876 inode->i_atime.tv_nsec = 0;
1877 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1878 inode->i_mtime.tv_nsec = 0;
1879 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1880 inode->i_ctime.tv_nsec = 0;
1881 inode->i_size = yaffs_get_obj_length(obj);
1882 inode->i_blocks = (inode->i_size + 511) >> 9;
1883 inode->i_nlink = yaffs_get_obj_link_count(obj);
1884 yaffs_trace(YAFFS_TRACE_OS,
1885 "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1886 inode->i_mode, inode->i_uid, inode->i_gid,
1887 (int)inode->i_size, atomic_read(&inode->i_count));
1889 switch (obj->yst_mode & S_IFMT) {
1890 default: /* fifo, device or socket */
1891 init_special_inode(inode, obj->yst_mode,
1892 old_decode_dev(obj->yst_rdev));
1894 case S_IFREG: /* file */
1895 inode->i_op = &yaffs_file_inode_operations;
1896 inode->i_fop = &yaffs_file_operations;
1897 inode->i_mapping->a_ops = &yaffs_file_address_operations;
1899 case S_IFDIR: /* directory */
1900 inode->i_op = &yaffs_dir_inode_operations;
1901 inode->i_fop = &yaffs_dir_operations;
1903 case S_IFLNK: /* symlink */
1904 inode->i_op = &yaffs_symlink_inode_operations;
1908 yaffs_inode_to_obj_lv(inode) = obj;
1909 obj->my_inode = inode;
1912 static void yaffs_put_super(struct super_block *sb)
1914 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1916 yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
1918 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1919 "Shutting down yaffs background thread");
1921 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1922 "yaffs background thread shut down");
1924 yaffs_gross_lock(dev);
1926 yaffs_flush_super(sb, 1);
1928 if (yaffs_dev_to_lc(dev)->put_super_fn)
1929 yaffs_dev_to_lc(dev)->put_super_fn(sb);
1931 yaffs_deinitialise(dev);
1933 yaffs_gross_unlock(dev);
1934 mutex_lock(&yaffs_context_lock);
1935 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
1936 mutex_unlock(&yaffs_context_lock);
1938 if (yaffs_dev_to_lc(dev)->spare_buffer) {
1939 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
1940 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
1946 static void yaffs_mtd_put_super(struct super_block *sb)
1948 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
1953 put_mtd_device(mtd);
1956 static const struct super_operations yaffs_super_ops = {
1957 .statfs = yaffs_statfs,
1958 .put_super = yaffs_put_super,
1959 .evict_inode = yaffs_evict_inode,
1960 .sync_fs = yaffs_sync_fs,
1961 .write_super = yaffs_write_super,
1964 static struct super_block *yaffs_internal_read_super(int yaffs_version,
1965 struct super_block *sb,
1966 void *data, int silent)
1969 struct inode *inode = NULL;
1970 struct dentry *root;
1971 struct yaffs_dev *dev = 0;
1972 char devname_buf[BDEVNAME_SIZE + 1];
1973 struct mtd_info *mtd;
1975 char *data_str = (char *)data;
1976 struct yaffs_linux_context *context = NULL;
1977 struct yaffs_param *param;
1979 struct yaffs_options options;
1982 struct yaffs_linux_context *context_iterator;
1983 struct list_head *l;
1986 printk(KERN_INFO "yaffs: sb is NULL\n");
1990 sb->s_magic = YAFFS_MAGIC;
1991 sb->s_op = &yaffs_super_ops;
1992 sb->s_flags |= MS_NOATIME;
1994 read_only = ((sb->s_flags & MS_RDONLY) != 0);
1996 sb->s_export_op = &yaffs_export_ops;
1999 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2000 else if (!yaffs_devname(sb, devname_buf))
2001 printk(KERN_INFO "yaffs: devname is NULL\n");
2003 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2005 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2010 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2012 memset(&options, 0, sizeof(options));
2014 if (yaffs_parse_options(&options, data_str))
2015 /* Option parsing failed */
2018 sb->s_blocksize = PAGE_CACHE_SIZE;
2019 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2021 yaffs_trace(YAFFS_TRACE_OS,
2022 "yaffs_read_super: Using yaffs%d", yaffs_version);
2023 yaffs_trace(YAFFS_TRACE_OS,
2024 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2026 yaffs_trace(YAFFS_TRACE_ALWAYS,
2027 "Attempting MTD mount of %u.%u,\"%s\"",
2028 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2029 yaffs_devname(sb, devname_buf));
2031 /* Check it's an mtd device..... */
2032 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2033 return NULL; /* This isn't an mtd device */
2035 /* Get the device */
2036 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2038 yaffs_trace(YAFFS_TRACE_ALWAYS,
2039 "MTD device #%u doesn't appear to exist",
2043 /* Check it's NAND */
2044 if (mtd->type != MTD_NANDFLASH) {
2045 yaffs_trace(YAFFS_TRACE_ALWAYS,
2046 "MTD device is not NAND it's type %d",
2051 yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2052 yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2053 yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2054 yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2055 yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2056 yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2057 yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2058 yaffs_trace(YAFFS_TRACE_OS, " writesize %d", mtd->writesize);
2059 yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2060 yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2061 yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2063 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2065 if (yaffs_version == 1 && mtd->writesize >= 2048) {
2066 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2070 /* Added NCB 26/5/2006 for completeness */
2071 if (yaffs_version == 2 && !options.inband_tags &&
2072 mtd->writesize == 512) {
2073 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2078 if (yaffs_version == 2) {
2079 /* Check for version 2 style functions */
2081 !mtd->block_isbad ||
2082 !mtd->block_markbad ||
2084 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2085 yaffs_trace(YAFFS_TRACE_ALWAYS,
2086 "MTD device does not support required functions");
2090 if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2091 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2092 !options.inband_tags) {
2093 yaffs_trace(YAFFS_TRACE_ALWAYS,
2094 "MTD device does not have the right page sizes");
2098 /* Check for V1 style functions */
2101 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2102 yaffs_trace(YAFFS_TRACE_ALWAYS,
2103 "MTD device does not support required functions");
2107 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
2108 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2109 yaffs_trace(YAFFS_TRACE_ALWAYS,
2110 "MTD device does not support have the right page sizes");
2115 /* OK, so if we got here, we have an MTD that's NAND and looks
2116 * like it has the right capabilities
2117 * Set the struct yaffs_dev up for mtd
2120 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2123 "yaffs: mtd is read only, setting superblock read only");
2124 sb->s_flags |= MS_RDONLY;
2127 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2128 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2130 if (!dev || !context) {
2138 /* Deep shit could not allocate device structure */
2139 yaffs_trace(YAFFS_TRACE_ALWAYS,
2140 "yaffs_read_super failed trying to allocate yaffs_dev");
2143 memset(dev, 0, sizeof(struct yaffs_dev));
2144 param = &(dev->param);
2146 memset(context, 0, sizeof(struct yaffs_linux_context));
2147 dev->os_context = context;
2148 INIT_LIST_HEAD(&(context->context_list));
2150 context->super = sb;
2152 dev->read_only = read_only;
2154 sb->s_fs_info = dev;
2156 dev->driver_context = mtd;
2157 param->name = mtd->name;
2159 /* Set up the memory size parameters.... */
2162 YCALCBLOCKS(mtd->size,
2163 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2165 param->start_block = 0;
2166 param->end_block = n_blocks - 1;
2167 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2168 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2169 param->n_reserved_blocks = 5;
2170 param->n_caches = (options.no_cache) ? 0 : 10;
2171 param->inband_tags = options.inband_tags;
2173 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2174 param->disable_lazy_load = 1;
2176 #ifdef CONFIG_YAFFS_XATTR
2177 param->enable_xattr = 1;
2179 if (options.lazy_loading_overridden)
2180 param->disable_lazy_load = !options.lazy_loading_enabled;
2182 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2183 param->no_tags_ecc = 1;
2186 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2188 param->defered_dir_update = 1;
2191 if (options.tags_ecc_overridden)
2192 param->no_tags_ecc = !options.tags_ecc_on;
2194 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2195 param->empty_lost_n_found = 1;
2198 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2199 param->refresh_period = 0;
2201 param->refresh_period = 500;
2204 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2205 param->always_check_erased = 1;
2208 if (options.empty_lost_and_found_overridden)
2209 param->empty_lost_n_found = options.empty_lost_and_found;
2211 /* ... and the functions. */
2212 if (yaffs_version == 2) {
2213 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2214 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2215 param->bad_block_fn = nandmtd2_mark_block_bad;
2216 param->query_block_fn = nandmtd2_query_block;
2217 yaffs_dev_to_lc(dev)->spare_buffer =
2218 kmalloc(mtd->oobsize, GFP_NOFS);
2219 param->is_yaffs2 = 1;
2220 param->total_bytes_per_chunk = mtd->writesize;
2221 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2222 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2224 param->start_block = 0;
2225 param->end_block = n_blocks - 1;
2227 /* use the MTD interface in yaffs_mtdif1.c */
2228 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2229 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2230 param->bad_block_fn = nandmtd1_mark_block_bad;
2231 param->query_block_fn = nandmtd1_query_block;
2232 param->is_yaffs2 = 0;
2234 /* ... and common functions */
2235 param->erase_fn = nandmtd_erase_block;
2236 param->initialise_flash_fn = nandmtd_initialise;
2238 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2240 param->sb_dirty_fn = yaffs_touch_super;
2241 param->gc_control = yaffs_gc_control_callback;
2243 yaffs_dev_to_lc(dev)->super = sb;
2245 #ifndef CONFIG_YAFFS_DOES_ECC
2246 param->use_nand_ecc = 1;
2249 param->skip_checkpt_rd = options.skip_checkpoint_read;
2250 param->skip_checkpt_wr = options.skip_checkpoint_write;
2252 mutex_lock(&yaffs_context_lock);
2253 /* Get a mount id */
2254 for (mount_id = 0, found = 0; !found; mount_id++) {
2256 list_for_each(l, &yaffs_context_list) {
2258 list_entry(l, struct yaffs_linux_context,
2260 if (context_iterator->mount_id == mount_id)
2264 context->mount_id = mount_id;
2266 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2267 &yaffs_context_list);
2268 mutex_unlock(&yaffs_context_lock);
2270 /* Directory search handling... */
2271 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2272 param->remove_obj_fn = yaffs_remove_obj_callback;
2274 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2276 yaffs_gross_lock(dev);
2278 err = yaffs_guts_initialise(dev);
2280 yaffs_trace(YAFFS_TRACE_OS,
2281 "yaffs_read_super: guts initialised %s",
2282 (err == YAFFS_OK) ? "OK" : "FAILED");
2284 if (err == YAFFS_OK)
2285 yaffs_bg_start(dev);
2287 if (!context->bg_thread)
2288 param->defered_dir_update = 0;
2290 /* Release lock before yaffs_get_inode() */
2291 yaffs_gross_unlock(dev);
2293 /* Create root inode */
2294 if (err == YAFFS_OK)
2295 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2300 inode->i_op = &yaffs_dir_inode_operations;
2301 inode->i_fop = &yaffs_dir_operations;
2303 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2305 root = d_alloc_root(inode);
2307 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2314 sb->s_dirt = !dev->is_checkpointed;
2315 yaffs_trace(YAFFS_TRACE_ALWAYS,
2316 "yaffs_read_super: is_checkpointed %d",
2317 dev->is_checkpointed);
2319 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2323 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2326 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2329 static int yaffs_read_super(struct file_system_type *fs,
2330 int flags, const char *dev_name,
2331 void *data, struct vfsmount *mnt)
2334 return get_sb_bdev(fs, flags, dev_name, data,
2335 yaffs_internal_read_super_mtd, mnt);
2338 static struct file_system_type yaffs_fs_type = {
2339 .owner = THIS_MODULE,
2341 .get_sb = yaffs_read_super,
2342 .kill_sb = kill_block_super,
2343 .fs_flags = FS_REQUIRES_DEV,
2346 #ifdef CONFIG_YAFFS_YAFFS2
2348 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2351 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2354 static int yaffs2_read_super(struct file_system_type *fs,
2355 int flags, const char *dev_name, void *data,
2356 struct vfsmount *mnt)
2358 return get_sb_bdev(fs, flags, dev_name, data,
2359 yaffs2_internal_read_super_mtd, mnt);
2362 static struct file_system_type yaffs2_fs_type = {
2363 .owner = THIS_MODULE,
2365 .get_sb = yaffs2_read_super,
2366 .kill_sb = kill_block_super,
2367 .fs_flags = FS_REQUIRES_DEV,
2369 #endif /* CONFIG_YAFFS_YAFFS2 */
2371 static struct proc_dir_entry *my_proc_entry;
2373 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
2375 struct yaffs_param *param = &dev->param;
2377 buf += sprintf(buf, "start_block........... %d\n", param->start_block);
2378 buf += sprintf(buf, "end_block............. %d\n", param->end_block);
2379 buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
2380 param->total_bytes_per_chunk);
2381 buf += sprintf(buf, "use_nand_ecc.......... %d\n",
2382 param->use_nand_ecc);
2383 buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
2384 buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
2385 buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
2386 buf += sprintf(buf, "empty_lost_n_found.... %d\n",
2387 param->empty_lost_n_found);
2388 buf += sprintf(buf, "disable_lazy_load..... %d\n",
2389 param->disable_lazy_load);
2390 buf += sprintf(buf, "refresh_period........ %d\n",
2391 param->refresh_period);
2392 buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
2393 buf += sprintf(buf, "n_reserved_blocks..... %d\n",
2394 param->n_reserved_blocks);
2395 buf += sprintf(buf, "always_check_erased... %d\n",
2396 param->always_check_erased);
2401 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
2404 sprintf(buf, "data_bytes_per_chunk.. %d\n",
2405 dev->data_bytes_per_chunk);
2406 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2407 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2409 sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2411 sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2412 buf += sprintf(buf, "\n");
2413 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2414 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2415 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2416 buf += sprintf(buf, "\n");
2417 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2418 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2419 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2420 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2421 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2423 sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2425 sprintf(buf, "oldest_dirty_gc_count. %u\n",
2426 dev->oldest_dirty_gc_count);
2427 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2428 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2430 sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
2432 sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2433 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2434 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2436 sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2438 sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
2439 dev->n_tags_ecc_unfixed);
2440 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2442 sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2444 sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2445 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2446 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2451 static int yaffs_proc_read(char *page,
2453 off_t offset, int count, int *eof, void *data)
2455 struct list_head *item;
2460 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2461 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2462 * This also assumes the user has posted a read buffer large
2463 * enough to hold the complete output; but that's life in /proc.
2468 /* Print header first */
2470 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
2472 buf += sprintf(buf, "\n");
2476 mutex_lock(&yaffs_context_lock);
2478 /* Locate and print the Nth entry.
2479 * Order N-squared but N is small. */
2480 list_for_each(item, &yaffs_context_list) {
2481 struct yaffs_linux_context *dc =
2482 list_entry(item, struct yaffs_linux_context,
2484 struct yaffs_dev *dev = dc->dev;
2486 if (n < (step & ~1)) {
2490 if ((step & 1) == 0) {
2492 sprintf(buf, "\nDevice %d \"%s\"\n", n,
2494 buf = yaffs_dump_dev_part0(buf, dev);
2496 buf = yaffs_dump_dev_part1(buf, dev);
2501 mutex_unlock(&yaffs_context_lock);
2504 return buf - page < count ? buf - page : count;
2509 * Set the verbosity of the warnings and error messages.
2511 * Note that the names can only be a..z or _ with the current code.
2516 unsigned mask_bitfield;
2518 {"allocate", YAFFS_TRACE_ALLOCATE},
2519 {"always", YAFFS_TRACE_ALWAYS},
2520 {"background", YAFFS_TRACE_BACKGROUND},
2521 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2522 {"buffers", YAFFS_TRACE_BUFFERS},
2523 {"bug", YAFFS_TRACE_BUG},
2524 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2525 {"deletion", YAFFS_TRACE_DELETION},
2526 {"erase", YAFFS_TRACE_ERASE},
2527 {"error", YAFFS_TRACE_ERROR},
2528 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2529 {"gc", YAFFS_TRACE_GC},
2530 {"lock", YAFFS_TRACE_LOCK},
2531 {"mtd", YAFFS_TRACE_MTD},
2532 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2533 {"os", YAFFS_TRACE_OS},
2534 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2535 {"scan", YAFFS_TRACE_SCAN},
2536 {"mount", YAFFS_TRACE_MOUNT},
2537 {"tracing", YAFFS_TRACE_TRACING},
2538 {"sync", YAFFS_TRACE_SYNC},
2539 {"write", YAFFS_TRACE_WRITE},
2540 {"verify", YAFFS_TRACE_VERIFY},
2541 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2542 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2543 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2544 {"all", 0xffffffff},
2549 #define MAX_MASK_NAME_LENGTH 40
2550 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
2551 unsigned long count, void *data)
2553 unsigned rg = 0, mask_bitfield;
2557 char substring[MAX_MASK_NAME_LENGTH + 1];
2563 rg = yaffs_trace_mask;
2565 while (!done && (pos < count)) {
2567 while ((pos < count) && isspace(buf[pos]))
2584 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2586 if (end > buf + pos) {
2587 mask_name = "numeral";
2588 len = end - (buf + pos);
2592 for (x = buf + pos, i = 0;
2593 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2594 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2596 substring[i] = '\0';
2598 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2599 if (strcmp(substring, mask_flags[i].mask_name)
2601 mask_name = mask_flags[i].mask_name;
2603 mask_flags[i].mask_bitfield;
2610 if (mask_name != NULL) {
2614 rg &= ~mask_bitfield;
2617 rg |= mask_bitfield;
2623 rg |= mask_bitfield;
2629 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
2631 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
2633 if (rg & YAFFS_TRACE_ALWAYS) {
2634 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2636 flag = ((rg & mask_flags[i].mask_bitfield) ==
2637 mask_flags[i].mask_bitfield) ? '+' : '-';
2638 printk(KERN_DEBUG "%c%s\n", flag,
2639 mask_flags[i].mask_name);
2646 static int yaffs_proc_write(struct file *file, const char *buf,
2647 unsigned long count, void *data)
2649 return yaffs_proc_write_trace_options(file, buf, count, data);
2652 /* Stuff to handle installation of file systems */
2653 struct file_system_to_install {
2654 struct file_system_type *fst;
2658 static struct file_system_to_install fs_to_install[] = {
2659 {&yaffs_fs_type, 0},
2660 {&yaffs2_fs_type, 0},
2664 static int __init init_yaffs_fs(void)
2667 struct file_system_to_install *fsinst;
2669 yaffs_trace(YAFFS_TRACE_ALWAYS,
2670 "yaffs built " __DATE__ " " __TIME__ " Installing.");
2672 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2673 yaffs_trace(YAFFS_TRACE_ALWAYS,
2674 "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
2677 mutex_init(&yaffs_context_lock);
2679 /* Install the proc_fs entries */
2680 my_proc_entry = create_proc_entry("yaffs",
2681 S_IRUGO | S_IFREG, NULL);
2683 if (my_proc_entry) {
2684 my_proc_entry->write_proc = yaffs_proc_write;
2685 my_proc_entry->read_proc = yaffs_proc_read;
2686 my_proc_entry->data = NULL;
2692 /* Now add the file system entries */
2694 fsinst = fs_to_install;
2696 while (fsinst->fst && !error) {
2697 error = register_filesystem(fsinst->fst);
2699 fsinst->installed = 1;
2703 /* Any errors? uninstall */
2705 fsinst = fs_to_install;
2707 while (fsinst->fst) {
2708 if (fsinst->installed) {
2709 unregister_filesystem(fsinst->fst);
2710 fsinst->installed = 0;
2719 static void __exit exit_yaffs_fs(void)
2722 struct file_system_to_install *fsinst;
2724 yaffs_trace(YAFFS_TRACE_ALWAYS,
2725 "yaffs built " __DATE__ " " __TIME__ " removing.");
2727 remove_proc_entry("yaffs", NULL);
2729 fsinst = fs_to_install;
2731 while (fsinst->fst) {
2732 if (fsinst->installed) {
2733 unregister_filesystem(fsinst->fst);
2734 fsinst->installed = 0;
2740 module_init(init_yaffs_fs)
2741 module_exit(exit_yaffs_fs)
2743 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2744 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
2745 MODULE_LICENSE("GPL");