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 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 yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
254 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
255 d_instantiate(dentry, inode);
256 update_dir_time(dir);
257 yaffs_trace(YAFFS_TRACE_OS,
258 "yaffs_mknod created object %d count = %d",
259 obj->obj_id, atomic_read(&inode->i_count));
260 yaffs_fill_inode_from_obj(dir, parent);
265 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
267 return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
270 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
273 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
276 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
277 struct dentry *dentry)
279 struct inode *inode = old_dentry->d_inode;
280 struct yaffs_obj *obj = NULL;
281 struct yaffs_obj *link = NULL;
282 struct yaffs_dev *dev;
284 yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
286 obj = yaffs_inode_to_obj(inode);
289 yaffs_gross_lock(dev);
291 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
293 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
297 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
298 d_instantiate(dentry, old_dentry->d_inode);
299 atomic_inc(&old_dentry->d_inode->i_count);
300 yaffs_trace(YAFFS_TRACE_OS,
301 "yaffs_link link count %d i_count %d",
302 old_dentry->d_inode->i_nlink,
303 atomic_read(&old_dentry->d_inode->i_count));
306 yaffs_gross_unlock(dev);
309 update_dir_time(dir);
316 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
319 struct yaffs_obj *obj;
320 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);
335 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
339 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
340 d_instantiate(dentry, inode);
341 update_dir_time(dir);
342 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
347 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
350 struct yaffs_obj *obj;
351 struct inode *inode = NULL;
352 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
354 if (current != yaffs_dev_to_lc(dev)->readdir_process)
355 yaffs_gross_lock(dev);
357 yaffs_trace(YAFFS_TRACE_OS,
358 "yaffs_lookup for %d:%s",
359 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
361 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
363 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
365 /* Can't hold gross lock when calling yaffs_get_inode() */
366 if (current != yaffs_dev_to_lc(dev)->readdir_process)
367 yaffs_gross_unlock(dev);
370 yaffs_trace(YAFFS_TRACE_OS,
371 "yaffs_lookup found %d", obj->obj_id);
373 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
376 yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
377 d_add(dentry, inode);
383 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
387 d_add(dentry, inode);
392 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
395 struct yaffs_dev *dev;
396 struct yaffs_obj *obj;
398 yaffs_trace(YAFFS_TRACE_OS,
399 "yaffs_unlink %d:%s",
400 (int)(dir->i_ino), dentry->d_name.name);
401 obj = yaffs_inode_to_obj(dir);
404 yaffs_gross_lock(dev);
406 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
408 if (ret_val == YAFFS_OK) {
409 dentry->d_inode->i_nlink--;
411 yaffs_gross_unlock(dev);
412 mark_inode_dirty(dentry->d_inode);
413 update_dir_time(dir);
416 yaffs_gross_unlock(dev);
420 static int yaffs_sync_object(struct file *file, int datasync)
423 struct yaffs_obj *obj;
424 struct yaffs_dev *dev;
425 struct dentry *dentry = file->f_path.dentry;
427 obj = yaffs_dentry_to_obj(dentry);
431 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
432 yaffs_gross_lock(dev);
433 yaffs_flush_file(obj, 1, datasync);
434 yaffs_gross_unlock(dev);
438 * The VFS layer already does all the dentry stuff for rename.
440 * NB: POSIX says you can rename an object over an old object of the same name
442 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
443 struct inode *new_dir, struct dentry *new_dentry)
445 struct yaffs_dev *dev;
446 int ret_val = YAFFS_FAIL;
447 struct yaffs_obj *target;
449 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
450 dev = yaffs_inode_to_obj(old_dir)->my_dev;
452 yaffs_gross_lock(dev);
454 /* Check if the target is an existing directory that is not empty. */
455 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
456 new_dentry->d_name.name);
458 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
459 !list_empty(&target->variant.dir_variant.children)) {
461 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
463 ret_val = YAFFS_FAIL;
465 /* Now does unlinking internally using shadowing mechanism */
466 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
468 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
469 old_dentry->d_name.name,
470 yaffs_inode_to_obj(new_dir),
471 new_dentry->d_name.name);
473 yaffs_gross_unlock(dev);
475 if (ret_val == YAFFS_OK) {
477 new_dentry->d_inode->i_nlink--;
478 mark_inode_dirty(new_dentry->d_inode);
481 update_dir_time(old_dir);
482 if (old_dir != new_dir)
483 update_dir_time(new_dir);
490 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
492 struct inode *inode = dentry->d_inode;
494 struct yaffs_dev *dev;
497 yaffs_trace(YAFFS_TRACE_OS,
498 "yaffs_setattr of object %d",
499 yaffs_inode_to_obj(inode)->obj_id);
501 /* Fail if a requested resize >= 2GB */
502 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
506 error = inode_change_ok(inode, attr);
509 setattr_copy(inode, attr);
510 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
511 if (attr->ia_valid & ATTR_SIZE) {
512 truncate_setsize(inode, attr->ia_size);
513 inode->i_blocks = (inode->i_size + 511) >> 9;
515 dev = yaffs_inode_to_obj(inode)->my_dev;
516 if (attr->ia_valid & ATTR_SIZE) {
517 yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
518 (int)(attr->ia_size),
519 (int)(attr->ia_size));
522 yaffs_gross_lock(dev);
523 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
524 if (result != YAFFS_OK)
526 yaffs_gross_unlock(dev);
529 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
534 #ifdef CONFIG_YAFFS_XATTR
535 static int yaffs_setxattr(struct dentry *dentry, const char *name,
536 const void *value, size_t size, int flags)
538 struct inode *inode = dentry->d_inode;
540 struct yaffs_dev *dev;
541 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
543 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
546 yaffs_gross_lock(dev);
547 error = yaffs_set_xattrib(obj, name, value, size, flags);
548 yaffs_gross_unlock(dev);
550 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
555 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
556 void *buff, size_t size)
558 struct inode *inode = dentry->d_inode;
560 struct yaffs_dev *dev;
561 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
563 yaffs_trace(YAFFS_TRACE_OS,
564 "yaffs_getxattr \"%s\" from object %d",
568 yaffs_gross_lock(dev);
569 error = yaffs_get_xattrib(obj, name, buff, size);
570 yaffs_gross_unlock(dev);
572 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
577 static int yaffs_removexattr(struct dentry *dentry, const char *name)
579 struct inode *inode = dentry->d_inode;
581 struct yaffs_dev *dev;
582 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
584 yaffs_trace(YAFFS_TRACE_OS,
585 "yaffs_removexattr of object %d", obj->obj_id);
588 yaffs_gross_lock(dev);
589 error = yaffs_remove_xattrib(obj, name);
590 yaffs_gross_unlock(dev);
592 yaffs_trace(YAFFS_TRACE_OS,
593 "yaffs_removexattr done returning %d", error);
598 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
600 struct inode *inode = dentry->d_inode;
602 struct yaffs_dev *dev;
603 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
605 yaffs_trace(YAFFS_TRACE_OS,
606 "yaffs_listxattr of object %d", obj->obj_id);
609 yaffs_gross_lock(dev);
610 error = yaffs_list_xattrib(obj, buff, size);
611 yaffs_gross_unlock(dev);
613 yaffs_trace(YAFFS_TRACE_OS,
614 "yaffs_listxattr done returning %d", error);
621 static const struct inode_operations yaffs_dir_inode_operations = {
622 .create = yaffs_create,
623 .lookup = yaffs_lookup,
625 .unlink = yaffs_unlink,
626 .symlink = yaffs_symlink,
627 .mkdir = yaffs_mkdir,
628 .rmdir = yaffs_unlink,
629 .mknod = yaffs_mknod,
630 .rename = yaffs_rename,
631 .setattr = yaffs_setattr,
632 #ifdef CONFIG_YAFFS_XATTR
633 .setxattr = yaffs_setxattr,
634 .getxattr = yaffs_getxattr,
635 .listxattr = yaffs_listxattr,
636 .removexattr = yaffs_removexattr,
639 /*-----------------------------------------------------------------*/
640 /* Directory search context allows us to unlock access to yaffs during
641 * filldir without causing problems with the directory being modified.
642 * This is similar to the tried and tested mechanism used in yaffs direct.
644 * A search context iterates along a doubly linked list of siblings in the
645 * directory. If the iterating object is deleted then this would corrupt
646 * the list iteration, likely causing a crash. The search context avoids
647 * this by using the remove_obj_fn to move the search context to the
648 * next object before the object is deleted.
650 * Many readdirs (and thus seach conexts) may be alive simulateously so
651 * each struct yaffs_dev has a list of these.
653 * A seach context lives for the duration of a readdir.
655 * All these functions must be called while yaffs is locked.
658 struct yaffs_search_context {
659 struct yaffs_dev *dev;
660 struct yaffs_obj *dir_obj;
661 struct yaffs_obj *next_return;
662 struct list_head others;
666 * yaffs_new_search() creates a new search context, initialises it and
667 * adds it to the device's search context list.
669 * Called at start of readdir.
671 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
673 struct yaffs_dev *dev = dir->my_dev;
674 struct yaffs_search_context *sc =
675 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
682 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
683 sc->next_return = NULL;
686 list_entry(dir->variant.dir_variant.children.next,
687 struct yaffs_obj, siblings);
688 INIT_LIST_HEAD(&sc->others);
689 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
695 * yaffs_search_end() disposes of a search context and cleans up.
697 static void yaffs_search_end(struct yaffs_search_context *sc)
700 list_del(&sc->others);
706 * yaffs_search_advance() moves a search context to the next object.
707 * Called when the search iterates or when an object removal causes
708 * the search context to be moved to the next object.
710 static void yaffs_search_advance(struct yaffs_search_context *sc)
715 if (sc->next_return == NULL ||
716 list_empty(&sc->dir_obj->variant.dir_variant.children))
717 sc->next_return = NULL;
719 struct list_head *next = sc->next_return->siblings.next;
721 if (next == &sc->dir_obj->variant.dir_variant.children)
722 sc->next_return = NULL; /* end of list */
725 list_entry(next, struct yaffs_obj, siblings);
730 * yaffs_remove_obj_callback() is called when an object is unlinked.
731 * We check open search contexts and advance any which are currently
732 * on the object being iterated.
734 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
738 struct yaffs_search_context *sc;
739 struct list_head *search_contexts =
740 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
742 /* Iterate through the directory search contexts.
743 * If any are currently on the object being removed, then advance
744 * the search context to the next object to prevent a hanging pointer.
746 list_for_each(i, search_contexts) {
747 sc = list_entry(i, struct yaffs_search_context, others);
748 if (sc->next_return == obj)
749 yaffs_search_advance(sc);
754 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
756 struct yaffs_obj *obj;
757 struct yaffs_dev *dev;
758 struct yaffs_search_context *sc;
759 struct inode *inode = f->f_dentry->d_inode;
760 unsigned long offset, curoffs;
763 char name[YAFFS_MAX_NAME_LENGTH + 1];
765 obj = yaffs_dentry_to_obj(f->f_dentry);
768 yaffs_gross_lock(dev);
770 yaffs_dev_to_lc(dev)->readdir_process = current;
774 sc = yaffs_new_search(obj);
780 yaffs_trace(YAFFS_TRACE_OS,
781 "yaffs_readdir: starting at %d", (int)offset);
784 yaffs_trace(YAFFS_TRACE_OS,
785 "yaffs_readdir: entry . ino %d",
787 yaffs_gross_unlock(dev);
788 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
789 yaffs_gross_lock(dev);
792 yaffs_gross_lock(dev);
797 yaffs_trace(YAFFS_TRACE_OS,
798 "yaffs_readdir: entry .. ino %d",
799 (int)f->f_dentry->d_parent->d_inode->i_ino);
800 yaffs_gross_unlock(dev);
801 if (filldir(dirent, "..", 2, offset,
802 f->f_dentry->d_parent->d_inode->i_ino,
804 yaffs_gross_lock(dev);
807 yaffs_gross_lock(dev);
814 /* If the directory has changed since the open or last call to
815 readdir, rewind to after the 2 canned entries. */
816 if (f->f_version != inode->i_version) {
819 f->f_version = inode->i_version;
822 while (sc->next_return) {
825 if (curoffs >= offset) {
826 int this_inode = yaffs_get_obj_inode(l);
827 int this_type = yaffs_get_obj_type(l);
829 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
830 yaffs_trace(YAFFS_TRACE_OS,
831 "yaffs_readdir: %s inode %d",
832 name, yaffs_get_obj_inode(l));
834 yaffs_gross_unlock(dev);
839 offset, this_inode, this_type) < 0) {
840 yaffs_gross_lock(dev);
844 yaffs_gross_lock(dev);
849 yaffs_search_advance(sc);
853 yaffs_search_end(sc);
854 yaffs_dev_to_lc(dev)->readdir_process = NULL;
855 yaffs_gross_unlock(dev);
860 static const struct file_operations yaffs_dir_operations = {
861 .read = generic_read_dir,
862 .readdir = yaffs_readdir,
863 .fsync = yaffs_sync_object,
864 .llseek = generic_file_llseek,
869 static int yaffs_file_flush(struct file *file, fl_owner_t id)
871 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
872 struct yaffs_dev *dev = obj->my_dev;
874 yaffs_trace(YAFFS_TRACE_OS,
875 "yaffs_file_flush object %d (%s)",
876 obj->obj_id, obj->dirty ? "dirty" : "clean");
878 yaffs_gross_lock(dev);
880 yaffs_flush_file(obj, 1, 0);
882 yaffs_gross_unlock(dev);
887 static const struct file_operations yaffs_file_operations = {
888 .read = do_sync_read,
889 .write = do_sync_write,
890 .aio_read = generic_file_aio_read,
891 .aio_write = generic_file_aio_write,
892 .mmap = generic_file_mmap,
893 .flush = yaffs_file_flush,
894 .fsync = yaffs_sync_object,
895 .splice_read = generic_file_splice_read,
896 .splice_write = generic_file_splice_write,
897 .llseek = generic_file_llseek,
901 /* ExportFS support */
902 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
905 return yaffs_iget(sb, ino);
908 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
909 struct fid *fid, int fh_len,
912 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
913 yaffs2_nfs_get_inode);
916 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
917 struct fid *fid, int fh_len,
920 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
921 yaffs2_nfs_get_inode);
924 struct dentry *yaffs2_get_parent(struct dentry *dentry)
927 struct super_block *sb = dentry->d_inode->i_sb;
928 struct dentry *parent = ERR_PTR(-ENOENT);
930 unsigned long parent_ino;
931 struct yaffs_obj *d_obj;
932 struct yaffs_obj *parent_obj;
934 d_obj = yaffs_inode_to_obj(dentry->d_inode);
937 parent_obj = d_obj->parent;
939 parent_ino = yaffs_get_obj_inode(parent_obj);
940 inode = yaffs_iget(sb, parent_ino);
943 parent = ERR_CAST(inode);
945 parent = d_obtain_alias(inode);
946 if (!IS_ERR(parent)) {
947 parent = ERR_PTR(-ENOMEM);
956 /* Just declare a zero structure as a NULL value implies
957 * using the default functions of exportfs.
960 static struct export_operations yaffs_export_ops = {
961 .fh_to_dentry = yaffs2_fh_to_dentry,
962 .fh_to_parent = yaffs2_fh_to_parent,
963 .get_parent = yaffs2_get_parent,
967 /*-----------------------------------------------------------------*/
969 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
972 unsigned char *alias;
974 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
976 yaffs_gross_lock(dev);
978 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
980 yaffs_gross_unlock(dev);
985 ret = vfs_readlink(dentry, buffer, buflen, alias);
990 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
992 unsigned char *alias;
994 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
996 yaffs_gross_lock(dev);
998 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
999 yaffs_gross_unlock(dev);
1002 ret = ERR_PTR(-ENOMEM);
1006 nd_set_link(nd, alias);
1007 ret = (void *)alias;
1012 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1018 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
1020 /* Clear the association between the inode and
1021 * the struct yaffs_obj.
1023 obj->my_inode = NULL;
1024 yaffs_inode_to_obj_lv(inode) = NULL;
1026 /* If the object freeing was deferred, then the real
1028 * This should fix the inode inconsistency problem.
1030 yaffs_handle_defered_free(obj);
1033 /* yaffs_evict_inode combines into one operation what was previously done in
1034 * yaffs_clear_inode() and yaffs_delete_inode()
1037 static void yaffs_evict_inode(struct inode *inode)
1039 struct yaffs_obj *obj;
1040 struct yaffs_dev *dev;
1043 obj = yaffs_inode_to_obj(inode);
1045 yaffs_trace(YAFFS_TRACE_OS,
1046 "yaffs_evict_inode: ino %d, count %d %s",
1048 atomic_read(&inode->i_count),
1049 obj ? "object exists" : "null object");
1051 if (!inode->i_nlink && !is_bad_inode(inode))
1053 truncate_inode_pages(&inode->i_data, 0);
1054 end_writeback(inode);
1056 if (deleteme && obj) {
1058 yaffs_gross_lock(dev);
1060 yaffs_gross_unlock(dev);
1064 yaffs_gross_lock(dev);
1065 yaffs_unstitch_obj(inode, obj);
1066 yaffs_gross_unlock(dev);
1071 static void yaffs_touch_super(struct yaffs_dev *dev)
1073 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
1075 yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
1080 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
1082 /* Lifted from jffs2 */
1084 struct yaffs_obj *obj;
1085 unsigned char *pg_buf;
1087 struct yaffs_dev *dev;
1089 yaffs_trace(YAFFS_TRACE_OS,
1090 "yaffs_readpage_nolock at %08x, size %08x",
1091 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
1092 (unsigned)PAGE_CACHE_SIZE);
1094 obj = yaffs_dentry_to_obj(f->f_dentry);
1098 BUG_ON(!PageLocked(pg));
1101 /* FIXME: Can kmap fail? */
1103 yaffs_gross_lock(dev);
1105 ret = yaffs_file_rd(obj, pg_buf,
1106 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
1108 yaffs_gross_unlock(dev);
1114 ClearPageUptodate(pg);
1117 SetPageUptodate(pg);
1121 flush_dcache_page(pg);
1124 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1128 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1130 int ret = yaffs_readpage_nolock(f, pg);
1136 static int yaffs_readpage(struct file *f, struct page *pg)
1140 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1141 ret = yaffs_readpage_unlock(f, pg);
1142 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1146 /* writepage inspired by/stolen from smbfs */
1148 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1150 struct yaffs_dev *dev;
1151 struct address_space *mapping = page->mapping;
1152 struct inode *inode;
1153 unsigned long end_index;
1155 struct yaffs_obj *obj;
1162 inode = mapping->host;
1165 i_size = i_size_read(inode);
1167 end_index = i_size >> PAGE_CACHE_SHIFT;
1169 if (page->index < end_index)
1170 n_bytes = PAGE_CACHE_SIZE;
1172 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1174 if (page->index > end_index || !n_bytes) {
1175 yaffs_trace(YAFFS_TRACE_OS,
1176 "yaffs_writepage at %08x, inode size = %08x!!!",
1177 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1178 (unsigned)inode->i_size);
1179 yaffs_trace(YAFFS_TRACE_OS,
1180 " -> don't care!!");
1182 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1183 set_page_writeback(page);
1185 end_page_writeback(page);
1190 if (n_bytes != PAGE_CACHE_SIZE)
1191 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1195 buffer = kmap(page);
1197 obj = yaffs_inode_to_obj(inode);
1199 yaffs_gross_lock(dev);
1201 yaffs_trace(YAFFS_TRACE_OS,
1202 "yaffs_writepage at %08x, size %08x",
1203 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1204 yaffs_trace(YAFFS_TRACE_OS,
1205 "writepag0: obj = %05x, ino = %05x",
1206 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1208 n_written = yaffs_wr_file(obj, buffer,
1209 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
1211 yaffs_touch_super(dev);
1213 yaffs_trace(YAFFS_TRACE_OS,
1214 "writepag1: obj = %05x, ino = %05x",
1215 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1217 yaffs_gross_unlock(dev);
1220 set_page_writeback(page);
1222 end_page_writeback(page);
1225 return (n_written == n_bytes) ? 0 : -ENOSPC;
1228 /* Space holding and freeing is done to ensure we have space available for
1230 * For now we just assume few parallel writes and check against a small
1232 * Todo: need to do this with a counter to handle parallel reads better
1235 static ssize_t yaffs_hold_space(struct file *f)
1237 struct yaffs_obj *obj;
1238 struct yaffs_dev *dev;
1241 obj = yaffs_dentry_to_obj(f->f_dentry);
1245 yaffs_gross_lock(dev);
1247 n_free_chunks = yaffs_get_n_free_chunks(dev);
1249 yaffs_gross_unlock(dev);
1251 return (n_free_chunks > 20) ? 1 : 0;
1254 static void yaffs_release_space(struct file *f)
1256 struct yaffs_obj *obj;
1257 struct yaffs_dev *dev;
1259 obj = yaffs_dentry_to_obj(f->f_dentry);
1263 yaffs_gross_lock(dev);
1265 yaffs_gross_unlock(dev);
1268 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1269 loff_t pos, unsigned len, unsigned flags,
1270 struct page **pagep, void **fsdata)
1272 struct page *pg = NULL;
1273 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1278 pg = grab_cache_page_write_begin(mapping, index, flags);
1285 yaffs_trace(YAFFS_TRACE_OS,
1286 "start yaffs_write_begin index %d(%x) uptodate %d",
1287 (int)index, (int)index, PageUptodate(pg) ? 1 : 0);
1290 space_held = yaffs_hold_space(filp);
1297 /* Update page if required */
1299 if (!PageUptodate(pg))
1300 ret = yaffs_readpage_nolock(filp, pg);
1305 /* Happy path return */
1306 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1311 yaffs_trace(YAFFS_TRACE_OS,
1312 "end yaffs_write_begin fail returning %d", ret);
1314 yaffs_release_space(filp);
1317 page_cache_release(pg);
1322 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1325 struct yaffs_obj *obj;
1326 int n_written, ipos;
1327 struct inode *inode;
1328 struct yaffs_dev *dev;
1330 obj = yaffs_dentry_to_obj(f->f_dentry);
1333 /* This should not happen */
1334 yaffs_trace(YAFFS_TRACE_OS,
1335 "yaffs_file_write: hey obj is null!");
1341 yaffs_gross_lock(dev);
1343 inode = f->f_dentry->d_inode;
1345 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1346 ipos = inode->i_size;
1350 yaffs_trace(YAFFS_TRACE_OS,
1351 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1352 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1354 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1356 yaffs_touch_super(dev);
1358 yaffs_trace(YAFFS_TRACE_OS,
1359 "yaffs_file_write: %d(%x) bytes written",
1360 (unsigned)n, (unsigned)n);
1362 if (n_written > 0) {
1365 if (ipos > inode->i_size) {
1366 inode->i_size = ipos;
1367 inode->i_blocks = (ipos + 511) >> 9;
1369 yaffs_trace(YAFFS_TRACE_OS,
1370 "yaffs_file_write size updated to %d bytes, %d blocks",
1371 ipos, (int)(inode->i_blocks));
1374 yaffs_gross_unlock(dev);
1375 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1378 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1379 loff_t pos, unsigned len, unsigned copied,
1380 struct page *pg, void *fsdadata)
1384 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1387 addr = kva + offset_into_page;
1389 yaffs_trace(YAFFS_TRACE_OS,
1390 "yaffs_write_end addr %p pos %x n_bytes %d",
1391 addr, (unsigned)pos, copied);
1393 ret = yaffs_file_write(filp, addr, copied, &pos);
1395 if (ret != copied) {
1396 yaffs_trace(YAFFS_TRACE_OS,
1397 "yaffs_write_end not same size ret %d copied %d",
1404 yaffs_release_space(filp);
1406 page_cache_release(pg);
1410 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1412 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1413 struct super_block *sb = dentry->d_sb;
1415 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
1417 yaffs_gross_lock(dev);
1419 buf->f_type = YAFFS_MAGIC;
1420 buf->f_bsize = sb->s_blocksize;
1421 buf->f_namelen = 255;
1423 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1424 /* Do this if chunk size is not a power of 2 */
1426 uint64_t bytes_in_dev;
1427 uint64_t bytes_free;
1431 ((dev->param.end_block - dev->param.start_block + 1))) *
1432 ((uint64_t) (dev->param.chunks_per_block *
1433 dev->data_bytes_per_chunk));
1435 do_div(bytes_in_dev, sb->s_blocksize);
1436 /* bytes_in_dev becomes the number of blocks */
1437 buf->f_blocks = bytes_in_dev;
1439 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
1440 ((uint64_t) (dev->data_bytes_per_chunk));
1442 do_div(bytes_free, sb->s_blocksize);
1444 buf->f_bfree = bytes_free;
1446 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1449 (dev->param.end_block - dev->param.start_block + 1) *
1450 dev->param.chunks_per_block /
1451 (sb->s_blocksize / dev->data_bytes_per_chunk);
1453 yaffs_get_n_free_chunks(dev) /
1454 (sb->s_blocksize / dev->data_bytes_per_chunk);
1457 (dev->param.end_block - dev->param.start_block + 1) *
1458 dev->param.chunks_per_block *
1459 (dev->data_bytes_per_chunk / sb->s_blocksize);
1462 yaffs_get_n_free_chunks(dev) *
1463 (dev->data_bytes_per_chunk / sb->s_blocksize);
1468 buf->f_bavail = buf->f_bfree;
1470 yaffs_gross_unlock(dev);
1474 static void yaffs_flush_inodes(struct super_block *sb)
1477 struct yaffs_obj *obj;
1479 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
1480 obj = yaffs_inode_to_obj(iptr);
1482 yaffs_trace(YAFFS_TRACE_OS,
1483 "flushing obj %d", obj->obj_id);
1484 yaffs_flush_file(obj, 1, 0);
1489 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1491 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1496 yaffs_flush_inodes(sb);
1497 yaffs_update_dirty_dirs(dev);
1498 yaffs_flush_whole_cache(dev);
1500 yaffs_checkpoint_save(dev);
1503 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1505 unsigned erased_chunks =
1506 dev->n_erased_blocks * dev->param.chunks_per_block;
1507 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1508 unsigned scattered = 0; /* Free chunks not in an erased block */
1510 if (erased_chunks < dev->n_free_chunks)
1511 scattered = (dev->n_free_chunks - erased_chunks);
1513 if (!context->bg_running)
1515 else if (scattered < (dev->param.chunks_per_block * 2))
1517 else if (erased_chunks > dev->n_free_chunks / 2)
1519 else if (erased_chunks > dev->n_free_chunks / 4)
1525 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
1528 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1529 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1530 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1533 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1534 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
1536 sb->s_dirt ? "dirty" : "clean",
1537 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1538 oneshot_checkpoint ? " one-shot" : "");
1540 yaffs_gross_lock(dev);
1541 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1542 oneshot_checkpoint) && !dev->is_checkpointed;
1544 if (sb->s_dirt || do_checkpoint) {
1545 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1547 if (oneshot_checkpoint)
1548 yaffs_auto_checkpoint &= ~4;
1550 yaffs_gross_unlock(dev);
1556 * yaffs background thread functions .
1557 * yaffs_bg_thread_fn() the thread function
1558 * yaffs_bg_start() launches the background thread.
1559 * yaffs_bg_stop() cleans up the background thread.
1562 * The thread should only run after the yaffs is initialised
1563 * The thread should be stopped before yaffs is unmounted.
1564 * The thread should not do any writing while the fs is in read only.
1567 void yaffs_background_waker(unsigned long data)
1569 wake_up_process((struct task_struct *)data);
1572 static int yaffs_bg_thread_fn(void *data)
1574 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1575 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1576 unsigned long now = jiffies;
1577 unsigned long next_dir_update = now;
1578 unsigned long next_gc = now;
1579 unsigned long expires;
1580 unsigned int urgency;
1582 struct timer_list timer;
1584 yaffs_trace(YAFFS_TRACE_BACKGROUND,
1585 "yaffs_background starting for dev %p", (void *)dev);
1588 while (context->bg_running) {
1589 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
1591 if (kthread_should_stop())
1594 if (try_to_freeze())
1597 yaffs_gross_lock(dev);
1601 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1602 yaffs_update_dirty_dirs(dev);
1603 next_dir_update = now + HZ;
1606 if (time_after(now, next_gc) && yaffs_bg_enable) {
1607 if (!dev->is_checkpointed) {
1608 urgency = yaffs_bg_gc_urgency(dev);
1609 gc_result = yaffs_bg_gc(dev, urgency);
1611 next_gc = now + HZ / 20 + 1;
1612 else if (urgency > 0)
1613 next_gc = now + HZ / 10 + 1;
1615 next_gc = now + HZ * 2;
1618 * gc not running so set to next_dir_update
1619 * to cut down on wake ups
1621 next_gc = next_dir_update;
1624 yaffs_gross_unlock(dev);
1625 expires = next_dir_update;
1626 if (time_before(next_gc, expires))
1628 if (time_before(expires, now))
1631 init_timer_on_stack(&timer);
1632 timer.expires = expires + 1;
1633 timer.data = (unsigned long)current;
1634 timer.function = yaffs_background_waker;
1636 set_current_state(TASK_INTERRUPTIBLE);
1639 del_timer_sync(&timer);
1645 static int yaffs_bg_start(struct yaffs_dev *dev)
1648 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1653 context->bg_running = 1;
1655 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1656 (void *)dev, "yaffs-bg-%d",
1659 if (IS_ERR(context->bg_thread)) {
1660 retval = PTR_ERR(context->bg_thread);
1661 context->bg_thread = NULL;
1662 context->bg_running = 0;
1667 static void yaffs_bg_stop(struct yaffs_dev *dev)
1669 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1671 ctxt->bg_running = 0;
1673 if (ctxt->bg_thread) {
1674 kthread_stop(ctxt->bg_thread);
1675 ctxt->bg_thread = NULL;
1679 static void yaffs_write_super(struct super_block *sb)
1681 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
1683 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1684 "yaffs_write_super%s",
1685 request_checkpoint ? " checkpt" : "");
1687 yaffs_do_sync_fs(sb, request_checkpoint);
1691 static int yaffs_sync_fs(struct super_block *sb, int wait)
1693 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
1695 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1696 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
1698 yaffs_do_sync_fs(sb, request_checkpoint);
1703 static LIST_HEAD(yaffs_context_list);
1704 struct mutex yaffs_context_lock;
1706 struct yaffs_options {
1708 int skip_checkpoint_read;
1709 int skip_checkpoint_write;
1712 int tags_ecc_overridden;
1713 int lazy_loading_enabled;
1714 int lazy_loading_overridden;
1715 int empty_lost_and_found;
1716 int empty_lost_and_found_overridden;
1719 #define MAX_OPT_LEN 30
1720 static int yaffs_parse_options(struct yaffs_options *options,
1721 const char *options_str)
1723 char cur_opt[MAX_OPT_LEN + 1];
1727 /* Parse through the options which is a comma seperated list */
1729 while (options_str && *options_str && !error) {
1730 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1733 while (*options_str == ',')
1736 while (*options_str && *options_str != ',') {
1737 if (p < MAX_OPT_LEN) {
1738 cur_opt[p] = *options_str;
1744 if (!strcmp(cur_opt, "inband-tags")) {
1745 options->inband_tags = 1;
1746 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
1747 options->tags_ecc_on = 0;
1748 options->tags_ecc_overridden = 1;
1749 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
1750 options->tags_ecc_on = 1;
1751 options->tags_ecc_overridden = 1;
1752 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
1753 options->lazy_loading_enabled = 0;
1754 options->lazy_loading_overridden = 1;
1755 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
1756 options->lazy_loading_enabled = 1;
1757 options->lazy_loading_overridden = 1;
1758 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
1759 options->empty_lost_and_found = 0;
1760 options->empty_lost_and_found_overridden = 1;
1761 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
1762 options->empty_lost_and_found = 1;
1763 options->empty_lost_and_found_overridden = 1;
1764 } else if (!strcmp(cur_opt, "no-cache")) {
1765 options->no_cache = 1;
1766 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
1767 options->skip_checkpoint_read = 1;
1768 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
1769 options->skip_checkpoint_write = 1;
1770 } else if (!strcmp(cur_opt, "no-checkpoint")) {
1771 options->skip_checkpoint_read = 1;
1772 options->skip_checkpoint_write = 1;
1774 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1782 static const struct address_space_operations yaffs_file_address_operations = {
1783 .readpage = yaffs_readpage,
1784 .writepage = yaffs_writepage,
1785 .write_begin = yaffs_write_begin,
1786 .write_end = yaffs_write_end,
1791 static const struct inode_operations yaffs_file_inode_operations = {
1792 .setattr = yaffs_setattr,
1793 #ifdef CONFIG_YAFFS_XATTR
1794 .setxattr = yaffs_setxattr,
1795 .getxattr = yaffs_getxattr,
1796 .listxattr = yaffs_listxattr,
1797 .removexattr = yaffs_removexattr,
1801 static const struct inode_operations yaffs_symlink_inode_operations = {
1802 .readlink = yaffs_readlink,
1803 .follow_link = yaffs_follow_link,
1804 .put_link = yaffs_put_link,
1805 .setattr = yaffs_setattr,
1806 #ifdef CONFIG_YAFFS_XATTR
1807 .setxattr = yaffs_setxattr,
1808 .getxattr = yaffs_getxattr,
1809 .listxattr = yaffs_listxattr,
1810 .removexattr = yaffs_removexattr,
1814 static void yaffs_fill_inode_from_obj(struct inode *inode,
1815 struct yaffs_obj *obj)
1817 if (!inode || !obj) {
1818 yaffs_trace(YAFFS_TRACE_OS,
1819 "yaffs_fill_inode invalid parameters");
1823 /* Check mode against the variant type
1824 * and attempt to repair if broken. */
1825 u32 mode = obj->yst_mode;
1827 switch (obj->variant_type) {
1828 case YAFFS_OBJECT_TYPE_FILE:
1829 if (!S_ISREG(mode)) {
1830 obj->yst_mode &= ~S_IFMT;
1831 obj->yst_mode |= S_IFREG;
1834 case YAFFS_OBJECT_TYPE_SYMLINK:
1835 if (!S_ISLNK(mode)) {
1836 obj->yst_mode &= ~S_IFMT;
1837 obj->yst_mode |= S_IFLNK;
1840 case YAFFS_OBJECT_TYPE_DIRECTORY:
1841 if (!S_ISDIR(mode)) {
1842 obj->yst_mode &= ~S_IFMT;
1843 obj->yst_mode |= S_IFDIR;
1846 case YAFFS_OBJECT_TYPE_UNKNOWN:
1847 case YAFFS_OBJECT_TYPE_HARDLINK:
1848 case YAFFS_OBJECT_TYPE_SPECIAL:
1854 inode->i_flags |= S_NOATIME;
1855 inode->i_ino = obj->obj_id;
1856 inode->i_mode = obj->yst_mode;
1857 inode->i_uid = obj->yst_uid;
1858 inode->i_gid = obj->yst_gid;
1860 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1862 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1863 inode->i_atime.tv_nsec = 0;
1864 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1865 inode->i_mtime.tv_nsec = 0;
1866 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1867 inode->i_ctime.tv_nsec = 0;
1868 inode->i_size = yaffs_get_obj_length(obj);
1869 inode->i_blocks = (inode->i_size + 511) >> 9;
1870 inode->i_nlink = yaffs_get_obj_link_count(obj);
1871 yaffs_trace(YAFFS_TRACE_OS,
1872 "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1873 inode->i_mode, inode->i_uid, inode->i_gid,
1874 (int)inode->i_size, atomic_read(&inode->i_count));
1876 switch (obj->yst_mode & S_IFMT) {
1877 default: /* fifo, device or socket */
1878 init_special_inode(inode, obj->yst_mode,
1879 old_decode_dev(obj->yst_rdev));
1881 case S_IFREG: /* file */
1882 inode->i_op = &yaffs_file_inode_operations;
1883 inode->i_fop = &yaffs_file_operations;
1884 inode->i_mapping->a_ops = &yaffs_file_address_operations;
1886 case S_IFDIR: /* directory */
1887 inode->i_op = &yaffs_dir_inode_operations;
1888 inode->i_fop = &yaffs_dir_operations;
1890 case S_IFLNK: /* symlink */
1891 inode->i_op = &yaffs_symlink_inode_operations;
1895 yaffs_inode_to_obj_lv(inode) = obj;
1896 obj->my_inode = inode;
1899 static void yaffs_put_super(struct super_block *sb)
1901 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1903 yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
1905 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1906 "Shutting down yaffs background thread");
1908 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
1909 "yaffs background thread shut down");
1911 yaffs_gross_lock(dev);
1913 yaffs_flush_super(sb, 1);
1915 if (yaffs_dev_to_lc(dev)->put_super_fn)
1916 yaffs_dev_to_lc(dev)->put_super_fn(sb);
1918 yaffs_deinitialise(dev);
1920 yaffs_gross_unlock(dev);
1921 mutex_lock(&yaffs_context_lock);
1922 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
1923 mutex_unlock(&yaffs_context_lock);
1925 if (yaffs_dev_to_lc(dev)->spare_buffer) {
1926 kfree(yaffs_dev_to_lc(dev)->spare_buffer);
1927 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
1933 static void yaffs_mtd_put_super(struct super_block *sb)
1935 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
1940 put_mtd_device(mtd);
1943 static const struct super_operations yaffs_super_ops = {
1944 .statfs = yaffs_statfs,
1945 .put_super = yaffs_put_super,
1946 .evict_inode = yaffs_evict_inode,
1947 .sync_fs = yaffs_sync_fs,
1948 .write_super = yaffs_write_super,
1951 static struct super_block *yaffs_internal_read_super(int yaffs_version,
1952 struct super_block *sb,
1953 void *data, int silent)
1956 struct inode *inode = NULL;
1957 struct dentry *root;
1958 struct yaffs_dev *dev = 0;
1959 char devname_buf[BDEVNAME_SIZE + 1];
1960 struct mtd_info *mtd;
1962 char *data_str = (char *)data;
1963 struct yaffs_linux_context *context = NULL;
1964 struct yaffs_param *param;
1966 struct yaffs_options options;
1969 struct yaffs_linux_context *context_iterator;
1970 struct list_head *l;
1973 printk(KERN_INFO "yaffs: sb is NULL\n");
1977 sb->s_magic = YAFFS_MAGIC;
1978 sb->s_op = &yaffs_super_ops;
1979 sb->s_flags |= MS_NOATIME;
1981 read_only = ((sb->s_flags & MS_RDONLY) != 0);
1983 sb->s_export_op = &yaffs_export_ops;
1986 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
1987 else if (!yaffs_devname(sb, devname_buf))
1988 printk(KERN_INFO "yaffs: devname is NULL\n");
1990 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
1992 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
1997 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
1999 memset(&options, 0, sizeof(options));
2001 if (yaffs_parse_options(&options, data_str))
2002 /* Option parsing failed */
2005 sb->s_blocksize = PAGE_CACHE_SIZE;
2006 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2008 yaffs_trace(YAFFS_TRACE_OS,
2009 "yaffs_read_super: Using yaffs%d", yaffs_version);
2010 yaffs_trace(YAFFS_TRACE_OS,
2011 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2013 yaffs_trace(YAFFS_TRACE_ALWAYS,
2014 "Attempting MTD mount of %u.%u,\"%s\"",
2015 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2016 yaffs_devname(sb, devname_buf));
2018 /* Check it's an mtd device..... */
2019 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2020 return NULL; /* This isn't an mtd device */
2022 /* Get the device */
2023 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2025 yaffs_trace(YAFFS_TRACE_ALWAYS,
2026 "MTD device #%u doesn't appear to exist",
2030 /* Check it's NAND */
2031 if (mtd->type != MTD_NANDFLASH) {
2032 yaffs_trace(YAFFS_TRACE_ALWAYS,
2033 "MTD device is not NAND it's type %d",
2038 yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2039 yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2040 yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2041 yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2042 yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2043 yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2044 yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2045 yaffs_trace(YAFFS_TRACE_OS, " writesize %d", mtd->writesize);
2046 yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2047 yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2048 yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2050 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2052 if (yaffs_version == 1 && mtd->writesize >= 2048) {
2053 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2057 /* Added NCB 26/5/2006 for completeness */
2058 if (yaffs_version == 2 && !options.inband_tags &&
2059 mtd->writesize == 512) {
2060 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2065 if (yaffs_version == 2) {
2066 /* Check for version 2 style functions */
2068 !mtd->block_isbad ||
2069 !mtd->block_markbad ||
2071 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2072 yaffs_trace(YAFFS_TRACE_ALWAYS,
2073 "MTD device does not support required functions");
2077 if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2078 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2079 !options.inband_tags) {
2080 yaffs_trace(YAFFS_TRACE_ALWAYS,
2081 "MTD device does not have the right page sizes");
2085 /* Check for V1 style functions */
2088 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2089 yaffs_trace(YAFFS_TRACE_ALWAYS,
2090 "MTD device does not support required functions");
2094 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
2095 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2096 yaffs_trace(YAFFS_TRACE_ALWAYS,
2097 "MTD device does not support have the right page sizes");
2102 /* OK, so if we got here, we have an MTD that's NAND and looks
2103 * like it has the right capabilities
2104 * Set the struct yaffs_dev up for mtd
2107 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2110 "yaffs: mtd is read only, setting superblock read only");
2111 sb->s_flags |= MS_RDONLY;
2114 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2115 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2117 if (!dev || !context) {
2125 /* Deep shit could not allocate device structure */
2126 yaffs_trace(YAFFS_TRACE_ALWAYS,
2127 "yaffs_read_super failed trying to allocate yaffs_dev");
2130 memset(dev, 0, sizeof(struct yaffs_dev));
2131 param = &(dev->param);
2133 memset(context, 0, sizeof(struct yaffs_linux_context));
2134 dev->os_context = context;
2135 INIT_LIST_HEAD(&(context->context_list));
2137 context->super = sb;
2139 dev->read_only = read_only;
2141 sb->s_fs_info = dev;
2143 dev->driver_context = mtd;
2144 param->name = mtd->name;
2146 /* Set up the memory size parameters.... */
2149 YCALCBLOCKS(mtd->size,
2150 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2152 param->start_block = 0;
2153 param->end_block = n_blocks - 1;
2154 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2155 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2156 param->n_reserved_blocks = 5;
2157 param->n_caches = (options.no_cache) ? 0 : 10;
2158 param->inband_tags = options.inband_tags;
2160 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2161 param->disable_lazy_load = 1;
2163 #ifdef CONFIG_YAFFS_XATTR
2164 param->enable_xattr = 1;
2166 if (options.lazy_loading_overridden)
2167 param->disable_lazy_load = !options.lazy_loading_enabled;
2169 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2170 param->no_tags_ecc = 1;
2173 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2175 param->defered_dir_update = 1;
2178 if (options.tags_ecc_overridden)
2179 param->no_tags_ecc = !options.tags_ecc_on;
2181 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2182 param->empty_lost_n_found = 1;
2185 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2186 param->refresh_period = 0;
2188 param->refresh_period = 500;
2191 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2192 param->always_check_erased = 1;
2195 if (options.empty_lost_and_found_overridden)
2196 param->empty_lost_n_found = options.empty_lost_and_found;
2198 /* ... and the functions. */
2199 if (yaffs_version == 2) {
2200 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2201 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2202 param->bad_block_fn = nandmtd2_mark_block_bad;
2203 param->query_block_fn = nandmtd2_query_block;
2204 yaffs_dev_to_lc(dev)->spare_buffer =
2205 kmalloc(mtd->oobsize, GFP_NOFS);
2206 param->is_yaffs2 = 1;
2207 param->total_bytes_per_chunk = mtd->writesize;
2208 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2209 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2211 param->start_block = 0;
2212 param->end_block = n_blocks - 1;
2214 /* use the MTD interface in yaffs_mtdif1.c */
2215 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2216 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2217 param->bad_block_fn = nandmtd1_mark_block_bad;
2218 param->query_block_fn = nandmtd1_query_block;
2219 param->is_yaffs2 = 0;
2221 /* ... and common functions */
2222 param->erase_fn = nandmtd_erase_block;
2223 param->initialise_flash_fn = nandmtd_initialise;
2225 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2227 param->sb_dirty_fn = yaffs_touch_super;
2228 param->gc_control = yaffs_gc_control_callback;
2230 yaffs_dev_to_lc(dev)->super = sb;
2232 #ifndef CONFIG_YAFFS_DOES_ECC
2233 param->use_nand_ecc = 1;
2236 param->skip_checkpt_rd = options.skip_checkpoint_read;
2237 param->skip_checkpt_wr = options.skip_checkpoint_write;
2239 mutex_lock(&yaffs_context_lock);
2240 /* Get a mount id */
2241 for (mount_id = 0, found = 0; !found; mount_id++) {
2243 list_for_each(l, &yaffs_context_list) {
2245 list_entry(l, struct yaffs_linux_context,
2247 if (context_iterator->mount_id == mount_id)
2251 context->mount_id = mount_id;
2253 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2254 &yaffs_context_list);
2255 mutex_unlock(&yaffs_context_lock);
2257 /* Directory search handling... */
2258 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2259 param->remove_obj_fn = yaffs_remove_obj_callback;
2261 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2263 yaffs_gross_lock(dev);
2265 err = yaffs_guts_initialise(dev);
2267 yaffs_trace(YAFFS_TRACE_OS,
2268 "yaffs_read_super: guts initialised %s",
2269 (err == YAFFS_OK) ? "OK" : "FAILED");
2271 if (err == YAFFS_OK)
2272 yaffs_bg_start(dev);
2274 if (!context->bg_thread)
2275 param->defered_dir_update = 0;
2277 /* Release lock before yaffs_get_inode() */
2278 yaffs_gross_unlock(dev);
2280 /* Create root inode */
2281 if (err == YAFFS_OK)
2282 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2287 inode->i_op = &yaffs_dir_inode_operations;
2288 inode->i_fop = &yaffs_dir_operations;
2290 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2292 root = d_alloc_root(inode);
2294 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2301 sb->s_dirt = !dev->is_checkpointed;
2302 yaffs_trace(YAFFS_TRACE_ALWAYS,
2303 "yaffs_read_super: is_checkpointed %d",
2304 dev->is_checkpointed);
2306 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2310 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2313 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2316 static int yaffs_read_super(struct file_system_type *fs,
2317 int flags, const char *dev_name,
2318 void *data, struct vfsmount *mnt)
2321 return get_sb_bdev(fs, flags, dev_name, data,
2322 yaffs_internal_read_super_mtd, mnt);
2325 static struct file_system_type yaffs_fs_type = {
2326 .owner = THIS_MODULE,
2328 .get_sb = yaffs_read_super,
2329 .kill_sb = kill_block_super,
2330 .fs_flags = FS_REQUIRES_DEV,
2333 #ifdef CONFIG_YAFFS_YAFFS2
2335 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2338 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2341 static int yaffs2_read_super(struct file_system_type *fs,
2342 int flags, const char *dev_name, void *data,
2343 struct vfsmount *mnt)
2345 return get_sb_bdev(fs, flags, dev_name, data,
2346 yaffs2_internal_read_super_mtd, mnt);
2349 static struct file_system_type yaffs2_fs_type = {
2350 .owner = THIS_MODULE,
2352 .get_sb = yaffs2_read_super,
2353 .kill_sb = kill_block_super,
2354 .fs_flags = FS_REQUIRES_DEV,
2356 #endif /* CONFIG_YAFFS_YAFFS2 */
2358 static struct proc_dir_entry *my_proc_entry;
2360 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
2362 struct yaffs_param *param = &dev->param;
2364 buf += sprintf(buf, "start_block........... %d\n", param->start_block);
2365 buf += sprintf(buf, "end_block............. %d\n", param->end_block);
2366 buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
2367 param->total_bytes_per_chunk);
2368 buf += sprintf(buf, "use_nand_ecc.......... %d\n",
2369 param->use_nand_ecc);
2370 buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
2371 buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
2372 buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
2373 buf += sprintf(buf, "empty_lost_n_found.... %d\n",
2374 param->empty_lost_n_found);
2375 buf += sprintf(buf, "disable_lazy_load..... %d\n",
2376 param->disable_lazy_load);
2377 buf += sprintf(buf, "refresh_period........ %d\n",
2378 param->refresh_period);
2379 buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
2380 buf += sprintf(buf, "n_reserved_blocks..... %d\n",
2381 param->n_reserved_blocks);
2382 buf += sprintf(buf, "always_check_erased... %d\n",
2383 param->always_check_erased);
2388 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
2391 sprintf(buf, "data_bytes_per_chunk.. %d\n",
2392 dev->data_bytes_per_chunk);
2393 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2394 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2396 sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2398 sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2399 buf += sprintf(buf, "\n");
2400 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2401 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2402 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2403 buf += sprintf(buf, "\n");
2404 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2405 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2406 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2407 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2408 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2410 sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2412 sprintf(buf, "oldest_dirty_gc_count. %u\n",
2413 dev->oldest_dirty_gc_count);
2414 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2415 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2417 sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
2419 sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2420 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2421 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2423 sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2425 sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
2426 dev->n_tags_ecc_unfixed);
2427 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2429 sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2431 sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2432 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2433 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2438 static int yaffs_proc_read(char *page,
2440 off_t offset, int count, int *eof, void *data)
2442 struct list_head *item;
2447 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2448 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2449 * This also assumes the user has posted a read buffer large
2450 * enough to hold the complete output; but that's life in /proc.
2455 /* Print header first */
2457 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
2459 buf += sprintf(buf, "\n");
2463 mutex_lock(&yaffs_context_lock);
2465 /* Locate and print the Nth entry.
2466 * Order N-squared but N is small. */
2467 list_for_each(item, &yaffs_context_list) {
2468 struct yaffs_linux_context *dc =
2469 list_entry(item, struct yaffs_linux_context,
2471 struct yaffs_dev *dev = dc->dev;
2473 if (n < (step & ~1)) {
2477 if ((step & 1) == 0) {
2479 sprintf(buf, "\nDevice %d \"%s\"\n", n,
2481 buf = yaffs_dump_dev_part0(buf, dev);
2483 buf = yaffs_dump_dev_part1(buf, dev);
2488 mutex_unlock(&yaffs_context_lock);
2491 return buf - page < count ? buf - page : count;
2496 * Set the verbosity of the warnings and error messages.
2498 * Note that the names can only be a..z or _ with the current code.
2503 unsigned mask_bitfield;
2505 {"allocate", YAFFS_TRACE_ALLOCATE},
2506 {"always", YAFFS_TRACE_ALWAYS},
2507 {"background", YAFFS_TRACE_BACKGROUND},
2508 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2509 {"buffers", YAFFS_TRACE_BUFFERS},
2510 {"bug", YAFFS_TRACE_BUG},
2511 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2512 {"deletion", YAFFS_TRACE_DELETION},
2513 {"erase", YAFFS_TRACE_ERASE},
2514 {"error", YAFFS_TRACE_ERROR},
2515 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2516 {"gc", YAFFS_TRACE_GC},
2517 {"lock", YAFFS_TRACE_LOCK},
2518 {"mtd", YAFFS_TRACE_MTD},
2519 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2520 {"os", YAFFS_TRACE_OS},
2521 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2522 {"scan", YAFFS_TRACE_SCAN},
2523 {"mount", YAFFS_TRACE_MOUNT},
2524 {"tracing", YAFFS_TRACE_TRACING},
2525 {"sync", YAFFS_TRACE_SYNC},
2526 {"write", YAFFS_TRACE_WRITE},
2527 {"verify", YAFFS_TRACE_VERIFY},
2528 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2529 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2530 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2531 {"all", 0xffffffff},
2536 #define MAX_MASK_NAME_LENGTH 40
2537 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
2538 unsigned long count, void *data)
2540 unsigned rg = 0, mask_bitfield;
2544 char substring[MAX_MASK_NAME_LENGTH + 1];
2550 rg = yaffs_trace_mask;
2552 while (!done && (pos < count)) {
2554 while ((pos < count) && isspace(buf[pos]))
2571 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2573 if (end > buf + pos) {
2574 mask_name = "numeral";
2575 len = end - (buf + pos);
2579 for (x = buf + pos, i = 0;
2580 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2581 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2583 substring[i] = '\0';
2585 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2586 if (strcmp(substring, mask_flags[i].mask_name)
2588 mask_name = mask_flags[i].mask_name;
2590 mask_flags[i].mask_bitfield;
2597 if (mask_name != NULL) {
2601 rg &= ~mask_bitfield;
2604 rg |= mask_bitfield;
2610 rg |= mask_bitfield;
2616 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
2618 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
2620 if (rg & YAFFS_TRACE_ALWAYS) {
2621 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2623 flag = ((rg & mask_flags[i].mask_bitfield) ==
2624 mask_flags[i].mask_bitfield) ? '+' : '-';
2625 printk(KERN_DEBUG "%c%s\n", flag,
2626 mask_flags[i].mask_name);
2633 static int yaffs_proc_write(struct file *file, const char *buf,
2634 unsigned long count, void *data)
2636 return yaffs_proc_write_trace_options(file, buf, count, data);
2639 /* Stuff to handle installation of file systems */
2640 struct file_system_to_install {
2641 struct file_system_type *fst;
2645 static struct file_system_to_install fs_to_install[] = {
2646 {&yaffs_fs_type, 0},
2647 {&yaffs2_fs_type, 0},
2651 static int __init init_yaffs_fs(void)
2654 struct file_system_to_install *fsinst;
2656 yaffs_trace(YAFFS_TRACE_ALWAYS,
2657 "yaffs built " __DATE__ " " __TIME__ " Installing.");
2659 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2660 yaffs_trace(YAFFS_TRACE_ALWAYS,
2661 "\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
2664 mutex_init(&yaffs_context_lock);
2666 /* Install the proc_fs entries */
2667 my_proc_entry = create_proc_entry("yaffs",
2668 S_IRUGO | S_IFREG, NULL);
2670 if (my_proc_entry) {
2671 my_proc_entry->write_proc = yaffs_proc_write;
2672 my_proc_entry->read_proc = yaffs_proc_read;
2673 my_proc_entry->data = NULL;
2679 /* Now add the file system entries */
2681 fsinst = fs_to_install;
2683 while (fsinst->fst && !error) {
2684 error = register_filesystem(fsinst->fst);
2686 fsinst->installed = 1;
2690 /* Any errors? uninstall */
2692 fsinst = fs_to_install;
2694 while (fsinst->fst) {
2695 if (fsinst->installed) {
2696 unregister_filesystem(fsinst->fst);
2697 fsinst->installed = 0;
2706 static void __exit exit_yaffs_fs(void)
2709 struct file_system_to_install *fsinst;
2711 yaffs_trace(YAFFS_TRACE_ALWAYS,
2712 "yaffs built " __DATE__ " " __TIME__ " removing.");
2714 remove_proc_entry("yaffs", NULL);
2716 fsinst = fs_to_install;
2718 while (fsinst->fst) {
2719 if (fsinst->installed) {
2720 unregister_filesystem(fsinst->fst);
2721 fsinst->installed = 0;
2727 module_init(init_yaffs_fs)
2728 module_exit(exit_yaffs_fs)
2730 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2731 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
2732 MODULE_LICENSE("GPL");