2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2018 Aleph One Ltd.
6 * Created by Charles Manning <charles@aleph1.co.uk>
8 * Luc van OostenRyck for numerous patches.
9 * Nick Bane for numerous patches.
10 * Nick Bane for 2.5/2.6 integration.
11 * Andras Toth for mknod rdev issue.
12 * Michael Fischer for finding the problem with inode inconsistency.
13 * Some code bodily lifted from JFFS
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
22 * This is the file system front-end to YAFFS that hooks it up to
26 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
28 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
30 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
34 * NB There are two variants of Linux VFS glue code. This variant supports
35 * a single version and should not include any multi-version code.
37 #include <linux/version.h>
38 #include <linux/kernel.h>
39 #include <linux/module.h>
40 #include <linux/slab.h>
41 #include <linux/init.h>
43 #include <linux/proc_fs.h>
44 #include <linux/pagemap.h>
45 #include <linux/mtd/mtd.h>
46 #include <linux/interrupt.h>
47 #include <linux/string.h>
48 #include <linux/ctype.h>
49 #include <linux/namei.h>
50 #include <linux/exportfs.h>
51 #include <linux/kthread.h>
52 #include <linux/delay.h>
53 #include <linux/freezer.h>
54 #include <asm/div64.h>
55 #include <linux/statfs.h>
56 #include <linux/uaccess.h>
57 #include <linux/mtd/mtd.h>
60 #include "yaffs_trace.h"
61 #include "yaffs_guts.h"
62 #include "yaffs_attribs.h"
63 #include "yaffs_linux.h"
64 #include "yaffs_mtdif.h"
65 #include "yaffs_mtdif1.h"
66 #include "yaffs_mtdif2.h"
68 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
69 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
70 unsigned int yaffs_auto_checkpoint = 1;
71 unsigned int yaffs_gc_control = 1;
72 unsigned int yaffs_bg_enable = 1;
73 unsigned int yaffs_auto_select = 1;
75 /* Module Parameters */
76 module_param(yaffs_trace_mask, uint, 0644);
77 module_param(yaffs_wr_attempts, uint, 0644);
78 module_param(yaffs_auto_checkpoint, uint, 0644);
79 module_param(yaffs_gc_control, uint, 0644);
80 module_param(yaffs_bg_enable, uint, 0644);
81 module_param(yaffs_auto_select, 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 set_nlink(old_dentry->d_inode, 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 if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
340 YAFFS_MAX_NAME_LENGTH)
341 return -ENAMETOOLONG;
343 if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
344 YAFFS_MAX_ALIAS_LENGTH)
345 return -ENAMETOOLONG;
347 dev = yaffs_inode_to_obj(dir)->my_dev;
348 yaffs_gross_lock(dev);
349 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
350 S_IFLNK | S_IRWXUGO, uid, gid, symname);
351 yaffs_gross_unlock(dev);
354 yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
358 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
359 d_instantiate(dentry, inode);
360 update_dir_time(dir);
361 yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
366 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
369 struct yaffs_obj *obj;
370 struct inode *inode = NULL;
371 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
373 if (current != yaffs_dev_to_lc(dev)->readdir_process)
374 yaffs_gross_lock(dev);
376 yaffs_trace(YAFFS_TRACE_OS,
377 "yaffs_lookup for %d:%s",
378 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
380 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
382 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
384 /* Can't hold gross lock when calling yaffs_get_inode() */
385 if (current != yaffs_dev_to_lc(dev)->readdir_process)
386 yaffs_gross_unlock(dev);
389 yaffs_trace(YAFFS_TRACE_OS,
390 "yaffs_lookup found %d", obj->obj_id);
392 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
395 yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
396 d_add(dentry, inode);
402 yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
406 d_add(dentry, inode);
411 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
414 struct yaffs_dev *dev;
415 struct yaffs_obj *obj;
417 yaffs_trace(YAFFS_TRACE_OS,
418 "yaffs_unlink %d:%s",
419 (int)(dir->i_ino), dentry->d_name.name);
420 obj = yaffs_inode_to_obj(dir);
423 yaffs_gross_lock(dev);
425 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
427 if (ret_val == YAFFS_OK) {
428 inode_dec_link_count(dentry->d_inode);
430 yaffs_gross_unlock(dev);
431 update_dir_time(dir);
434 yaffs_gross_unlock(dev);
438 static int yaffs_sync_object(struct file *file,
439 loff_t start, loff_t end, int datasync)
442 struct yaffs_obj *obj;
443 struct yaffs_dev *dev;
444 struct dentry *dentry = file->f_path.dentry;
446 obj = yaffs_dentry_to_obj(dentry);
450 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
451 yaffs_gross_lock(dev);
452 yaffs_flush_file(obj, 1, datasync, 0);
453 yaffs_gross_unlock(dev);
457 * The VFS layer already does all the dentry stuff for rename.
459 * NB: POSIX says you can rename an object over an old object of the same name
461 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
462 struct inode *new_dir, struct dentry *new_dentry)
464 struct yaffs_dev *dev;
465 int ret_val = YAFFS_FAIL;
466 struct yaffs_obj *target;
468 yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
469 dev = yaffs_inode_to_obj(old_dir)->my_dev;
471 yaffs_gross_lock(dev);
473 /* Check if the target is an existing directory that is not empty. */
474 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
475 new_dentry->d_name.name);
477 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
478 !list_empty(&target->variant.dir_variant.children)) {
480 yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
482 ret_val = YAFFS_FAIL;
484 /* Now does unlinking internally using shadowing mechanism */
485 yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
487 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
488 old_dentry->d_name.name,
489 yaffs_inode_to_obj(new_dir),
490 new_dentry->d_name.name);
492 yaffs_gross_unlock(dev);
494 if (ret_val == YAFFS_OK) {
496 inode_dec_link_count(new_dentry->d_inode);
498 update_dir_time(old_dir);
499 if (old_dir != new_dir)
500 update_dir_time(new_dir);
507 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
509 struct inode *inode = dentry->d_inode;
511 struct yaffs_dev *dev;
514 yaffs_trace(YAFFS_TRACE_OS,
515 "yaffs_setattr of object %d",
516 yaffs_inode_to_obj(inode)->obj_id);
518 /* Fail if a requested resize >= 2GB */
519 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
523 error = inode_change_ok(inode, attr);
526 setattr_copy(inode, attr);
527 yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
528 if (attr->ia_valid & ATTR_SIZE) {
529 truncate_setsize(inode, attr->ia_size);
530 inode->i_blocks = (inode->i_size + 511) >> 9;
532 dev = yaffs_inode_to_obj(inode)->my_dev;
533 if (attr->ia_valid & ATTR_SIZE) {
534 yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
535 (int)(attr->ia_size),
536 (int)(attr->ia_size));
539 yaffs_gross_lock(dev);
540 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
541 if (result != YAFFS_OK)
543 yaffs_gross_unlock(dev);
546 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
551 static int yaffs_setxattr(struct dentry *dentry, const char *name,
552 const void *value, size_t size, int flags)
554 struct inode *inode = dentry->d_inode;
556 struct yaffs_dev *dev;
557 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
559 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
562 yaffs_gross_lock(dev);
563 error = yaffs_set_xattrib(obj, name, value, size, flags);
564 yaffs_gross_unlock(dev);
566 yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
571 static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
572 void *buff, size_t size)
574 struct inode *inode = dentry->d_inode;
576 struct yaffs_dev *dev;
577 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
579 yaffs_trace(YAFFS_TRACE_OS,
580 "yaffs_getxattr \"%s\" from object %d",
584 yaffs_gross_lock(dev);
585 error = yaffs_get_xattrib(obj, name, buff, size);
586 yaffs_gross_unlock(dev);
588 yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
593 static int yaffs_removexattr(struct dentry *dentry, const char *name)
595 struct inode *inode = dentry->d_inode;
597 struct yaffs_dev *dev;
598 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
600 yaffs_trace(YAFFS_TRACE_OS,
601 "yaffs_removexattr of object %d", obj->obj_id);
604 yaffs_gross_lock(dev);
605 error = yaffs_remove_xattrib(obj, name);
606 yaffs_gross_unlock(dev);
608 yaffs_trace(YAFFS_TRACE_OS,
609 "yaffs_removexattr done returning %d", error);
614 static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
616 struct inode *inode = dentry->d_inode;
618 struct yaffs_dev *dev;
619 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
621 yaffs_trace(YAFFS_TRACE_OS,
622 "yaffs_listxattr of object %d", obj->obj_id);
625 yaffs_gross_lock(dev);
626 error = yaffs_list_xattrib(obj, buff, size);
627 yaffs_gross_unlock(dev);
629 yaffs_trace(YAFFS_TRACE_OS,
630 "yaffs_listxattr done returning %d", error);
635 static const struct inode_operations yaffs_dir_inode_operations = {
636 .create = yaffs_create,
637 .lookup = yaffs_lookup,
639 .unlink = yaffs_unlink,
640 .symlink = yaffs_symlink,
641 .mkdir = yaffs_mkdir,
642 .rmdir = yaffs_unlink,
643 .mknod = yaffs_mknod,
644 .rename = yaffs_rename,
645 .setattr = yaffs_setattr,
646 .setxattr = yaffs_setxattr,
647 .getxattr = yaffs_getxattr,
648 .listxattr = yaffs_listxattr,
649 .removexattr = yaffs_removexattr,
651 /*-----------------------------------------------------------------*/
652 /* Directory search context allows us to unlock access to yaffs during
653 * filldir without causing problems with the directory being modified.
654 * This is similar to the tried and tested mechanism used in yaffs direct.
656 * A search context iterates along a doubly linked list of siblings in the
657 * directory. If the iterating object is deleted then this would corrupt
658 * the list iteration, likely causing a crash. The search context avoids
659 * this by using the remove_obj_fn to move the search context to the
660 * next object before the object is deleted.
662 * Many readdirs (and thus seach conexts) may be alive simulateously so
663 * each struct yaffs_dev has a list of these.
665 * A seach context lives for the duration of a readdir.
667 * All these functions must be called while yaffs is locked.
670 struct yaffs_search_context {
671 struct yaffs_dev *dev;
672 struct yaffs_obj *dir_obj;
673 struct yaffs_obj *next_return;
674 struct list_head others;
678 * yaffs_new_search() creates a new search context, initialises it and
679 * adds it to the device's search context list.
681 * Called at start of readdir.
683 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
685 struct yaffs_dev *dev = dir->my_dev;
686 struct yaffs_search_context *sc =
687 kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
694 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
695 sc->next_return = NULL;
698 list_entry(dir->variant.dir_variant.children.next,
699 struct yaffs_obj, siblings);
700 INIT_LIST_HEAD(&sc->others);
701 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
707 * yaffs_search_end() disposes of a search context and cleans up.
709 static void yaffs_search_end(struct yaffs_search_context *sc)
712 list_del(&sc->others);
718 * yaffs_search_advance() moves a search context to the next object.
719 * Called when the search iterates or when an object removal causes
720 * the search context to be moved to the next object.
722 static void yaffs_search_advance(struct yaffs_search_context *sc)
727 if (sc->next_return == NULL ||
728 list_empty(&sc->dir_obj->variant.dir_variant.children))
729 sc->next_return = NULL;
731 struct list_head *next = sc->next_return->siblings.next;
733 if (next == &sc->dir_obj->variant.dir_variant.children)
734 sc->next_return = NULL; /* end of list */
737 list_entry(next, struct yaffs_obj, siblings);
742 * yaffs_remove_obj_callback() is called when an object is unlinked.
743 * We check open search contexts and advance any which are currently
744 * on the object being iterated.
746 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
750 struct yaffs_search_context *sc;
751 struct list_head *search_contexts =
752 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
754 /* Iterate through the directory search contexts.
755 * If any are currently on the object being removed, then advance
756 * the search context to the next object to prevent a hanging pointer.
758 list_for_each(i, search_contexts) {
759 sc = list_entry(i, struct yaffs_search_context, others);
760 if (sc->next_return == obj)
761 yaffs_search_advance(sc);
766 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
768 struct yaffs_obj *obj;
769 struct yaffs_dev *dev;
770 struct yaffs_search_context *sc;
771 struct inode *inode = f->f_dentry->d_inode;
772 unsigned long offset, curoffs;
775 char name[YAFFS_MAX_NAME_LENGTH + 1];
777 obj = yaffs_dentry_to_obj(f->f_dentry);
780 yaffs_gross_lock(dev);
782 yaffs_dev_to_lc(dev)->readdir_process = current;
786 sc = yaffs_new_search(obj);
792 yaffs_trace(YAFFS_TRACE_OS,
793 "yaffs_readdir: starting at %d", (int)offset);
796 yaffs_trace(YAFFS_TRACE_OS,
797 "yaffs_readdir: entry . ino %d",
799 yaffs_gross_unlock(dev);
800 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
801 yaffs_gross_lock(dev);
804 yaffs_gross_lock(dev);
809 yaffs_trace(YAFFS_TRACE_OS,
810 "yaffs_readdir: entry .. ino %d",
811 (int)f->f_dentry->d_parent->d_inode->i_ino);
812 yaffs_gross_unlock(dev);
813 if (filldir(dirent, "..", 2, offset,
814 f->f_dentry->d_parent->d_inode->i_ino,
816 yaffs_gross_lock(dev);
819 yaffs_gross_lock(dev);
826 /* If the directory has changed since the open or last call to
827 readdir, rewind to after the 2 canned entries. */
828 if (f->f_version != inode->i_version) {
831 f->f_version = inode->i_version;
834 while (sc->next_return) {
837 if (curoffs >= offset) {
838 int this_inode = yaffs_get_obj_inode(l);
839 int this_type = yaffs_get_obj_type(l);
841 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
842 yaffs_trace(YAFFS_TRACE_OS,
843 "yaffs_readdir: %s inode %d",
844 name, yaffs_get_obj_inode(l));
846 yaffs_gross_unlock(dev);
851 offset, this_inode, this_type) < 0) {
852 yaffs_gross_lock(dev);
856 yaffs_gross_lock(dev);
861 yaffs_search_advance(sc);
865 yaffs_search_end(sc);
866 yaffs_dev_to_lc(dev)->readdir_process = NULL;
867 yaffs_gross_unlock(dev);
872 static const struct file_operations yaffs_dir_operations = {
873 .read = generic_read_dir,
874 .readdir = yaffs_readdir,
875 .fsync = yaffs_sync_object,
876 .llseek = generic_file_llseek,
881 static int yaffs_file_flush(struct file *file, fl_owner_t id)
883 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
884 struct yaffs_dev *dev = obj->my_dev;
886 yaffs_trace(YAFFS_TRACE_OS,
887 "yaffs_file_flush object %d (%s)",
888 obj->obj_id, obj->dirty ? "dirty" : "clean");
890 yaffs_gross_lock(dev);
892 yaffs_flush_file(obj, 1, 0, 0);
894 yaffs_gross_unlock(dev);
899 static const struct file_operations yaffs_file_operations = {
900 .read = do_sync_read,
901 .write = do_sync_write,
902 .aio_read = generic_file_aio_read,
903 .aio_write = generic_file_aio_write,
904 .mmap = generic_file_mmap,
905 .flush = yaffs_file_flush,
906 .fsync = yaffs_sync_object,
907 .splice_read = generic_file_splice_read,
908 .splice_write = generic_file_splice_write,
909 .llseek = generic_file_llseek,
913 /* ExportFS support */
914 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
917 return yaffs_iget(sb, ino);
920 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
921 struct fid *fid, int fh_len,
924 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
925 yaffs2_nfs_get_inode);
928 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
929 struct fid *fid, int fh_len,
932 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
933 yaffs2_nfs_get_inode);
936 struct dentry *yaffs2_get_parent(struct dentry *dentry)
939 struct super_block *sb = dentry->d_inode->i_sb;
940 struct dentry *parent = ERR_PTR(-ENOENT);
942 unsigned long parent_ino;
943 struct yaffs_obj *d_obj;
944 struct yaffs_obj *parent_obj;
946 d_obj = yaffs_inode_to_obj(dentry->d_inode);
949 parent_obj = d_obj->parent;
951 parent_ino = yaffs_get_obj_inode(parent_obj);
952 inode = yaffs_iget(sb, parent_ino);
955 parent = ERR_CAST(inode);
957 parent = d_obtain_alias(inode);
958 if (!IS_ERR(parent)) {
959 parent = ERR_PTR(-ENOMEM);
968 /* Just declare a zero structure as a NULL value implies
969 * using the default functions of exportfs.
972 static struct export_operations yaffs_export_ops = {
973 .fh_to_dentry = yaffs2_fh_to_dentry,
974 .fh_to_parent = yaffs2_fh_to_parent,
975 .get_parent = yaffs2_get_parent,
979 /*-----------------------------------------------------------------*/
981 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
984 unsigned char *alias;
986 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
988 yaffs_gross_lock(dev);
990 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
992 yaffs_gross_unlock(dev);
997 ret = vfs_readlink(dentry, buffer, buflen, alias);
1002 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
1004 unsigned char *alias;
1006 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1008 yaffs_gross_lock(dev);
1010 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
1011 yaffs_gross_unlock(dev);
1014 ret = ERR_PTR(-ENOMEM);
1018 nd_set_link(nd, alias);
1019 ret = (void *)alias;
1024 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
1030 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
1032 /* Clear the association between the inode and
1033 * the struct yaffs_obj.
1035 obj->my_inode = NULL;
1036 yaffs_inode_to_obj_lv(inode) = NULL;
1038 /* If the object freeing was deferred, then the real
1040 * This should fix the inode inconsistency problem.
1042 yaffs_handle_defered_free(obj);
1045 /* yaffs_evict_inode combines into one operation what was previously done in
1046 * yaffs_clear_inode() and yaffs_delete_inode()
1049 static void yaffs_evict_inode(struct inode *inode)
1051 struct yaffs_obj *obj;
1052 struct yaffs_dev *dev;
1055 obj = yaffs_inode_to_obj(inode);
1057 yaffs_trace(YAFFS_TRACE_OS,
1058 "yaffs_evict_inode: ino %d, count %d %s",
1060 atomic_read(&inode->i_count),
1061 obj ? "object exists" : "null object");
1063 if (!inode->i_nlink && !is_bad_inode(inode))
1065 truncate_inode_pages(&inode->i_data, 0);
1066 end_writeback(inode);
1068 if (deleteme && obj) {
1070 yaffs_gross_lock(dev);
1072 yaffs_gross_unlock(dev);
1076 yaffs_gross_lock(dev);
1077 yaffs_unstitch_obj(inode, obj);
1078 yaffs_gross_unlock(dev);
1083 static void yaffs_touch_super(struct yaffs_dev *dev)
1085 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
1087 yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
1092 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
1094 /* Lifted from jffs2 */
1096 struct yaffs_obj *obj;
1097 unsigned char *pg_buf;
1099 struct yaffs_dev *dev;
1100 loff_t pos = ((loff_t) pg->index) << PAGE_CACHE_SHIFT;
1102 yaffs_trace(YAFFS_TRACE_OS,
1103 "yaffs_readpage_nolock at %lld, size %08x",
1105 (unsigned)PAGE_CACHE_SIZE);
1108 obj = yaffs_dentry_to_obj(f->f_dentry);
1112 BUG_ON(!PageLocked(pg));
1115 /* FIXME: Can kmap fail? */
1117 yaffs_gross_lock(dev);
1119 ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
1121 yaffs_gross_unlock(dev);
1127 ClearPageUptodate(pg);
1130 SetPageUptodate(pg);
1134 flush_dcache_page(pg);
1137 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
1141 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
1143 int ret = yaffs_readpage_nolock(f, pg);
1149 static int yaffs_readpage(struct file *f, struct page *pg)
1153 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
1154 ret = yaffs_readpage_unlock(f, pg);
1155 yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
1159 /* writepage inspired by/stolen from smbfs */
1161 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
1163 struct yaffs_dev *dev;
1164 struct address_space *mapping = page->mapping;
1165 struct inode *inode;
1166 unsigned long end_index;
1168 struct yaffs_obj *obj;
1175 inode = mapping->host;
1178 i_size = i_size_read(inode);
1180 end_index = i_size >> PAGE_CACHE_SHIFT;
1182 if (page->index < end_index)
1183 n_bytes = PAGE_CACHE_SIZE;
1185 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
1187 if (page->index > end_index || !n_bytes) {
1188 yaffs_trace(YAFFS_TRACE_OS,
1189 "yaffs_writepage at %08x, inode size = %08x!!!",
1190 (unsigned)(page->index << PAGE_CACHE_SHIFT),
1191 (unsigned)inode->i_size);
1192 yaffs_trace(YAFFS_TRACE_OS,
1193 " -> don't care!!");
1195 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
1196 set_page_writeback(page);
1198 end_page_writeback(page);
1203 if (n_bytes != PAGE_CACHE_SIZE)
1204 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
1208 buffer = kmap(page);
1210 obj = yaffs_inode_to_obj(inode);
1212 yaffs_gross_lock(dev);
1214 yaffs_trace(YAFFS_TRACE_OS,
1215 "yaffs_writepage at %08x, size %08x",
1216 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
1217 yaffs_trace(YAFFS_TRACE_OS,
1218 "writepag0: obj = %05x, ino = %05x",
1219 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1221 n_written = yaffs_wr_file(obj, buffer,
1222 ((loff_t)page->index) << PAGE_CACHE_SHIFT,
1225 yaffs_touch_super(dev);
1227 yaffs_trace(YAFFS_TRACE_OS,
1228 "writepag1: obj = %05x, ino = %05x",
1229 (int)obj->variant.file_variant.file_size, (int)inode->i_size);
1231 yaffs_gross_unlock(dev);
1234 set_page_writeback(page);
1236 end_page_writeback(page);
1239 return (n_written == n_bytes) ? 0 : -ENOSPC;
1242 /* Space holding and freeing is done to ensure we have space available for
1244 * For now we just assume few parallel writes and check against a small
1246 * Todo: need to do this with a counter to handle parallel reads better
1249 static ssize_t yaffs_hold_space(struct file *f)
1251 struct yaffs_obj *obj;
1252 struct yaffs_dev *dev;
1255 obj = yaffs_dentry_to_obj(f->f_dentry);
1259 yaffs_gross_lock(dev);
1261 n_free_chunks = yaffs_get_n_free_chunks(dev);
1263 yaffs_gross_unlock(dev);
1265 return (n_free_chunks > 20) ? 1 : 0;
1268 static void yaffs_release_space(struct file *f)
1270 struct yaffs_obj *obj;
1271 struct yaffs_dev *dev;
1273 obj = yaffs_dentry_to_obj(f->f_dentry);
1277 yaffs_gross_lock(dev);
1279 yaffs_gross_unlock(dev);
1282 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
1283 loff_t pos, unsigned len, unsigned flags,
1284 struct page **pagep, void **fsdata)
1286 struct page *pg = NULL;
1287 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1292 pg = grab_cache_page_write_begin(mapping, index, flags);
1299 yaffs_trace(YAFFS_TRACE_OS,
1300 "start yaffs_write_begin index %d(%x) uptodate %d",
1301 (int)index, (int)index, PageUptodate(pg) ? 1 : 0);
1304 space_held = yaffs_hold_space(filp);
1311 /* Update page if required */
1313 if (!PageUptodate(pg))
1314 ret = yaffs_readpage_nolock(filp, pg);
1319 /* Happy path return */
1320 yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
1325 yaffs_trace(YAFFS_TRACE_OS,
1326 "end yaffs_write_begin fail returning %d", ret);
1328 yaffs_release_space(filp);
1331 page_cache_release(pg);
1336 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1339 struct yaffs_obj *obj;
1340 int n_written, ipos;
1341 struct inode *inode;
1342 struct yaffs_dev *dev;
1344 obj = yaffs_dentry_to_obj(f->f_dentry);
1347 /* This should not happen */
1348 yaffs_trace(YAFFS_TRACE_OS,
1349 "yaffs_file_write: hey obj is null!");
1355 yaffs_gross_lock(dev);
1357 inode = f->f_dentry->d_inode;
1359 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1360 ipos = inode->i_size;
1364 yaffs_trace(YAFFS_TRACE_OS,
1365 "yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
1366 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
1368 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1370 yaffs_touch_super(dev);
1372 yaffs_trace(YAFFS_TRACE_OS,
1373 "yaffs_file_write: %d(%x) bytes written",
1374 (unsigned)n, (unsigned)n);
1376 if (n_written > 0) {
1379 if (ipos > inode->i_size) {
1380 inode->i_size = ipos;
1381 inode->i_blocks = (ipos + 511) >> 9;
1383 yaffs_trace(YAFFS_TRACE_OS,
1384 "yaffs_file_write size updated to %d bytes, %d blocks",
1385 ipos, (int)(inode->i_blocks));
1388 yaffs_gross_unlock(dev);
1389 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1392 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
1393 loff_t pos, unsigned len, unsigned copied,
1394 struct page *pg, void *fsdadata)
1398 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
1401 addr = kva + offset_into_page;
1403 yaffs_trace(YAFFS_TRACE_OS,
1404 "yaffs_write_end addr %p pos %x n_bytes %d",
1405 addr, (unsigned)pos, copied);
1407 ret = yaffs_file_write(filp, addr, copied, &pos);
1409 if (ret != copied) {
1410 yaffs_trace(YAFFS_TRACE_OS,
1411 "yaffs_write_end not same size ret %d copied %d",
1418 yaffs_release_space(filp);
1420 page_cache_release(pg);
1424 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1426 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1427 struct super_block *sb = dentry->d_sb;
1429 yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
1431 yaffs_gross_lock(dev);
1433 buf->f_type = YAFFS_MAGIC;
1434 buf->f_bsize = sb->s_blocksize;
1435 buf->f_namelen = 255;
1437 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1438 /* Do this if chunk size is not a power of 2 */
1440 uint64_t bytes_in_dev;
1441 uint64_t bytes_free;
1445 ((dev->param.end_block - dev->param.start_block + 1))) *
1446 ((uint64_t) (dev->param.chunks_per_block *
1447 dev->data_bytes_per_chunk));
1449 do_div(bytes_in_dev, sb->s_blocksize);
1450 /* bytes_in_dev becomes the number of blocks */
1451 buf->f_blocks = bytes_in_dev;
1453 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
1454 ((uint64_t) (dev->data_bytes_per_chunk));
1456 do_div(bytes_free, sb->s_blocksize);
1458 buf->f_bfree = bytes_free;
1460 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1463 (dev->param.end_block - dev->param.start_block + 1) *
1464 dev->param.chunks_per_block /
1465 (sb->s_blocksize / dev->data_bytes_per_chunk);
1467 yaffs_get_n_free_chunks(dev) /
1468 (sb->s_blocksize / dev->data_bytes_per_chunk);
1471 (dev->param.end_block - dev->param.start_block + 1) *
1472 dev->param.chunks_per_block *
1473 (dev->data_bytes_per_chunk / sb->s_blocksize);
1476 yaffs_get_n_free_chunks(dev) *
1477 (dev->data_bytes_per_chunk / sb->s_blocksize);
1482 buf->f_bavail = buf->f_bfree;
1484 yaffs_gross_unlock(dev);
1488 static void yaffs_flush_inodes(struct super_block *sb)
1491 struct yaffs_obj *obj;
1493 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
1494 obj = yaffs_inode_to_obj(iptr);
1496 yaffs_trace(YAFFS_TRACE_OS,
1497 "flushing obj %d", obj->obj_id);
1498 yaffs_flush_file(obj, 1, 0, 0);
1503 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1505 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1510 yaffs_flush_inodes(sb);
1511 yaffs_update_dirty_dirs(dev);
1512 yaffs_flush_whole_cache(dev, 1);
1514 yaffs_checkpoint_save(dev);
1517 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1519 unsigned erased_chunks =
1520 dev->n_erased_blocks * dev->param.chunks_per_block;
1521 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1522 unsigned scattered = 0; /* Free chunks not in an erased block */
1524 if (erased_chunks < dev->n_free_chunks)
1525 scattered = (dev->n_free_chunks - erased_chunks);
1527 if (!context->bg_running)
1529 else if (scattered < (dev->param.chunks_per_block * 2))
1531 else if (erased_chunks > dev->n_free_chunks / 2)
1533 else if (erased_chunks > dev->n_free_chunks / 4)
1539 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
1542 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1543 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1544 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1547 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1548 "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
1550 sb->s_dirt ? "dirty" : "clean",
1551 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1552 oneshot_checkpoint ? " one-shot" : "");
1554 yaffs_gross_lock(dev);
1555 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1556 oneshot_checkpoint) && !dev->is_checkpointed;
1558 if (sb->s_dirt || do_checkpoint) {
1559 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1561 if (oneshot_checkpoint)
1562 yaffs_auto_checkpoint &= ~4;
1564 yaffs_gross_unlock(dev);
1570 * yaffs background thread functions .
1571 * yaffs_bg_thread_fn() the thread function
1572 * yaffs_bg_start() launches the background thread.
1573 * yaffs_bg_stop() cleans up the background thread.
1576 * The thread should only run after the yaffs is initialised
1577 * The thread should be stopped before yaffs is unmounted.
1578 * The thread should not do any writing while the fs is in read only.
1581 void yaffs_background_waker(unsigned long data)
1583 wake_up_process((struct task_struct *)data);
1586 static int yaffs_bg_thread_fn(void *data)
1588 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1589 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1590 unsigned long now = jiffies;
1591 unsigned long next_dir_update = now;
1592 unsigned long next_gc = now;
1593 unsigned long expires;
1594 unsigned int urgency;
1596 struct timer_list timer;
1598 yaffs_trace(YAFFS_TRACE_BACKGROUND,
1599 "yaffs_background starting for dev %p", (void *)dev);
1602 while (context->bg_running) {
1603 yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
1605 if (kthread_should_stop())
1608 if (try_to_freeze())
1611 yaffs_gross_lock(dev);
1615 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1616 yaffs_update_dirty_dirs(dev);
1617 next_dir_update = now + HZ;
1620 if (time_after(now, next_gc) && yaffs_bg_enable) {
1621 if (!dev->is_checkpointed) {
1622 urgency = yaffs_bg_gc_urgency(dev);
1623 gc_result = yaffs_bg_gc(dev, urgency);
1625 next_gc = now + HZ / 20 + 1;
1626 else if (urgency > 0)
1627 next_gc = now + HZ / 10 + 1;
1629 next_gc = now + HZ * 2;
1632 * gc not running so set to next_dir_update
1633 * to cut down on wake ups
1635 next_gc = next_dir_update;
1638 yaffs_gross_unlock(dev);
1639 expires = next_dir_update;
1640 if (time_before(next_gc, expires))
1642 if (time_before(expires, now))
1645 init_timer_on_stack(&timer);
1646 timer.expires = expires + 1;
1647 timer.data = (unsigned long)current;
1648 timer.function = yaffs_background_waker;
1650 set_current_state(TASK_INTERRUPTIBLE);
1653 del_timer_sync(&timer);
1659 static int yaffs_bg_start(struct yaffs_dev *dev)
1662 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1667 context->bg_running = 1;
1669 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1670 (void *)dev, "yaffs-bg-%d",
1673 if (IS_ERR(context->bg_thread)) {
1674 retval = PTR_ERR(context->bg_thread);
1675 context->bg_thread = NULL;
1676 context->bg_running = 0;
1681 static void yaffs_bg_stop(struct yaffs_dev *dev)
1683 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1685 ctxt->bg_running = 0;
1687 if (ctxt->bg_thread) {
1688 kthread_stop(ctxt->bg_thread);
1689 ctxt->bg_thread = NULL;
1693 static void yaffs_write_super(struct super_block *sb)
1695 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
1697 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1698 "yaffs_write_super%s",
1699 request_checkpoint ? " checkpt" : "");
1701 yaffs_do_sync_fs(sb, request_checkpoint);
1705 static int yaffs_sync_fs(struct super_block *sb, int wait)
1707 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
1709 yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1710 "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
1712 yaffs_do_sync_fs(sb, request_checkpoint);
1717 static LIST_HEAD(yaffs_context_list);
1718 struct mutex yaffs_context_lock;
1720 struct yaffs_options {
1722 int skip_checkpoint_read;
1723 int skip_checkpoint_write;
1726 int tags_ecc_overridden;
1727 int lazy_loading_enabled;
1728 int lazy_loading_overridden;
1729 int empty_lost_and_found;
1730 int empty_lost_and_found_overridden;
1733 #define MAX_OPT_LEN 30
1734 static int yaffs_parse_options(struct yaffs_options *options,
1735 const char *options_str)
1737 char cur_opt[MAX_OPT_LEN + 1];
1741 /* Parse through the options which is a comma seperated list */
1743 while (options_str && *options_str && !error) {
1744 memset(cur_opt, 0, MAX_OPT_LEN + 1);
1747 while (*options_str == ',')
1750 while (*options_str && *options_str != ',') {
1751 if (p < MAX_OPT_LEN) {
1752 cur_opt[p] = *options_str;
1758 if (!strcmp(cur_opt, "inband-tags")) {
1759 options->inband_tags = 1;
1760 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
1761 options->tags_ecc_on = 0;
1762 options->tags_ecc_overridden = 1;
1763 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
1764 options->tags_ecc_on = 1;
1765 options->tags_ecc_overridden = 1;
1766 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
1767 options->lazy_loading_enabled = 0;
1768 options->lazy_loading_overridden = 1;
1769 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
1770 options->lazy_loading_enabled = 1;
1771 options->lazy_loading_overridden = 1;
1772 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
1773 options->empty_lost_and_found = 0;
1774 options->empty_lost_and_found_overridden = 1;
1775 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
1776 options->empty_lost_and_found = 1;
1777 options->empty_lost_and_found_overridden = 1;
1778 } else if (!strcmp(cur_opt, "no-cache")) {
1779 options->no_cache = 1;
1780 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
1781 options->skip_checkpoint_read = 1;
1782 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
1783 options->skip_checkpoint_write = 1;
1784 } else if (!strcmp(cur_opt, "no-checkpoint")) {
1785 options->skip_checkpoint_read = 1;
1786 options->skip_checkpoint_write = 1;
1788 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
1796 static const struct address_space_operations yaffs_file_address_operations = {
1797 .readpage = yaffs_readpage,
1798 .writepage = yaffs_writepage,
1799 .write_begin = yaffs_write_begin,
1800 .write_end = yaffs_write_end,
1805 static const struct inode_operations yaffs_file_inode_operations = {
1806 .setattr = yaffs_setattr,
1807 .setxattr = yaffs_setxattr,
1808 .getxattr = yaffs_getxattr,
1809 .listxattr = yaffs_listxattr,
1810 .removexattr = yaffs_removexattr,
1813 static const struct inode_operations yaffs_symlink_inode_operations = {
1814 .readlink = yaffs_readlink,
1815 .follow_link = yaffs_follow_link,
1816 .put_link = yaffs_put_link,
1817 .setattr = yaffs_setattr,
1818 .setxattr = yaffs_setxattr,
1819 .getxattr = yaffs_getxattr,
1820 .listxattr = yaffs_listxattr,
1821 .removexattr = yaffs_removexattr,
1824 static void yaffs_fill_inode_from_obj(struct inode *inode,
1825 struct yaffs_obj *obj)
1829 if (!inode || !obj) {
1830 yaffs_trace(YAFFS_TRACE_OS,
1831 "yaffs_fill_inode invalid parameters");
1835 /* Check mode against the variant type
1836 * and attempt to repair if broken. */
1837 mode = obj->yst_mode;
1839 switch (obj->variant_type) {
1840 case YAFFS_OBJECT_TYPE_FILE:
1841 if (!S_ISREG(mode)) {
1842 obj->yst_mode &= ~S_IFMT;
1843 obj->yst_mode |= S_IFREG;
1846 case YAFFS_OBJECT_TYPE_SYMLINK:
1847 if (!S_ISLNK(mode)) {
1848 obj->yst_mode &= ~S_IFMT;
1849 obj->yst_mode |= S_IFLNK;
1852 case YAFFS_OBJECT_TYPE_DIRECTORY:
1853 if (!S_ISDIR(mode)) {
1854 obj->yst_mode &= ~S_IFMT;
1855 obj->yst_mode |= S_IFDIR;
1858 case YAFFS_OBJECT_TYPE_UNKNOWN:
1859 case YAFFS_OBJECT_TYPE_HARDLINK:
1860 case YAFFS_OBJECT_TYPE_SPECIAL:
1866 inode->i_flags |= S_NOATIME;
1867 inode->i_ino = obj->obj_id;
1868 inode->i_mode = obj->yst_mode;
1869 inode->i_uid = obj->yst_uid;
1870 inode->i_gid = obj->yst_gid;
1872 inode->i_rdev = old_decode_dev(obj->yst_rdev);
1874 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
1875 inode->i_atime.tv_nsec = 0;
1876 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
1877 inode->i_mtime.tv_nsec = 0;
1878 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
1879 inode->i_ctime.tv_nsec = 0;
1880 inode->i_size = yaffs_get_obj_length(obj);
1881 inode->i_blocks = (inode->i_size + 511) >> 9;
1882 set_nlink(inode, yaffs_get_obj_link_count(obj));
1883 yaffs_trace(YAFFS_TRACE_OS,
1884 "yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
1885 inode->i_mode, inode->i_uid, inode->i_gid,
1886 (int)inode->i_size, atomic_read(&inode->i_count));
1888 switch (obj->yst_mode & S_IFMT) {
1889 default: /* fifo, device or socket */
1890 init_special_inode(inode, obj->yst_mode,
1891 old_decode_dev(obj->yst_rdev));
1893 case S_IFREG: /* file */
1894 inode->i_op = &yaffs_file_inode_operations;
1895 inode->i_fop = &yaffs_file_operations;
1896 inode->i_mapping->a_ops = &yaffs_file_address_operations;
1898 case S_IFDIR: /* directory */
1899 inode->i_op = &yaffs_dir_inode_operations;
1900 inode->i_fop = &yaffs_dir_operations;
1902 case S_IFLNK: /* symlink */
1903 inode->i_op = &yaffs_symlink_inode_operations;
1907 yaffs_inode_to_obj_lv(inode) = obj;
1908 obj->my_inode = inode;
1911 static void yaffs_put_super(struct super_block *sb)
1913 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1914 struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
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;
1945 if (mtd && mtd->sync)
1949 put_mtd_device(mtd);
1952 /* the function only is used to change dev->read_only when this file system
1955 static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
1958 struct mtd_info *mtd;
1959 struct yaffs_dev *dev = 0;
1961 /* Get the device */
1962 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
1964 yaffs_trace(YAFFS_TRACE_ALWAYS,
1965 "MTD device #%u doesn't appear to exist",
1970 /* Check it's NAND */
1971 if (mtd->type != MTD_NANDFLASH) {
1972 yaffs_trace(YAFFS_TRACE_ALWAYS,
1973 "MTD device is not NAND it's type %d",
1978 read_only = ((*flags & MS_RDONLY) != 0);
1979 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
1982 "yaffs: mtd is read only, setting superblock read only");
1983 *flags |= MS_RDONLY;
1986 dev = sb->s_fs_info;
1987 dev->read_only = read_only;
1993 static const struct super_operations yaffs_super_ops = {
1994 .statfs = yaffs_statfs,
1995 .put_super = yaffs_put_super,
1996 .evict_inode = yaffs_evict_inode,
1997 .sync_fs = yaffs_sync_fs,
1998 .write_super = yaffs_write_super,
1999 .remount_fs = yaffs_remount_fs,
2002 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2003 struct super_block *sb,
2004 void *data, int silent)
2007 struct inode *inode = NULL;
2008 struct dentry *root;
2009 struct yaffs_dev *dev = 0;
2010 char devname_buf[BDEVNAME_SIZE + 1];
2011 struct mtd_info *mtd;
2013 char *data_str = (char *)data;
2014 struct yaffs_linux_context *context = NULL;
2015 struct yaffs_param *param;
2017 struct yaffs_options options;
2020 struct yaffs_linux_context *context_iterator;
2021 struct list_head *l;
2024 printk(KERN_INFO "yaffs: sb is NULL\n");
2028 sb->s_magic = YAFFS_MAGIC;
2029 sb->s_op = &yaffs_super_ops;
2030 sb->s_flags |= MS_NOATIME;
2032 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2034 sb->s_export_op = &yaffs_export_ops;
2037 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2038 else if (!yaffs_devname(sb, devname_buf))
2039 printk(KERN_INFO "yaffs: devname is NULL\n");
2041 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2043 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2048 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2050 memset(&options, 0, sizeof(options));
2052 if (yaffs_parse_options(&options, data_str))
2053 /* Option parsing failed */
2056 sb->s_blocksize = PAGE_CACHE_SIZE;
2057 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2059 yaffs_trace(YAFFS_TRACE_OS,
2060 "yaffs_read_super: Using yaffs%d", yaffs_version);
2061 yaffs_trace(YAFFS_TRACE_OS,
2062 "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
2064 yaffs_trace(YAFFS_TRACE_ALWAYS,
2065 "Attempting MTD mount of %u.%u,\"%s\"",
2066 MAJOR(sb->s_dev), MINOR(sb->s_dev),
2067 yaffs_devname(sb, devname_buf));
2069 /* Check it's an mtd device..... */
2070 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2071 return NULL; /* This isn't an mtd device */
2073 /* Get the device */
2074 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2076 yaffs_trace(YAFFS_TRACE_ALWAYS,
2077 "MTD device #%u doesn't appear to exist",
2081 /* Check it's NAND */
2082 if (mtd->type != MTD_NANDFLASH) {
2083 yaffs_trace(YAFFS_TRACE_ALWAYS,
2084 "MTD device is not NAND it's type %d",
2089 yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
2090 yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
2091 yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
2092 yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
2093 yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
2094 yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
2095 yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
2096 yaffs_trace(YAFFS_TRACE_OS, " writesize %d", mtd->writesize);
2097 yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
2098 yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
2099 yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
2101 if (yaffs_auto_select && yaffs_version == 1 && mtd->writesize >= 2048) {
2102 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
2106 if (yaffs_auto_select && yaffs_version == 2 && !options.inband_tags &&
2107 mtd->writesize == 512) {
2108 yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
2112 if (yaffs_version == 2) {
2113 /* Check for version 2 style functions */
2115 !mtd->block_isbad ||
2116 !mtd->block_markbad ||
2118 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2119 yaffs_trace(YAFFS_TRACE_ALWAYS,
2120 "MTD device does not support required functions");
2124 if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2125 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2126 !options.inband_tags) {
2127 yaffs_trace(YAFFS_TRACE_ALWAYS,
2128 "MTD device does not have the right page sizes");
2132 /* Check for V1 style functions */
2135 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2136 yaffs_trace(YAFFS_TRACE_ALWAYS,
2137 "MTD device does not support required functions");
2141 if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
2142 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2143 yaffs_trace(YAFFS_TRACE_ALWAYS,
2144 "MTD device does not support have the right page sizes");
2149 /* OK, so if we got here, we have an MTD that's NAND and looks
2150 * like it has the right capabilities
2151 * Set the struct yaffs_dev up for mtd
2154 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2157 "yaffs: mtd is read only, setting superblock read only");
2158 sb->s_flags |= MS_RDONLY;
2161 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2162 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2164 if (!dev || !context) {
2170 /* Deep shit could not allocate device structure */
2171 yaffs_trace(YAFFS_TRACE_ALWAYS,
2172 "yaffs_read_super failed trying to allocate yaffs_dev");
2175 memset(dev, 0, sizeof(struct yaffs_dev));
2176 param = &(dev->param);
2178 memset(context, 0, sizeof(struct yaffs_linux_context));
2179 dev->os_context = context;
2180 INIT_LIST_HEAD(&(context->context_list));
2182 context->super = sb;
2184 dev->read_only = read_only;
2186 sb->s_fs_info = dev;
2188 dev->driver_context = mtd;
2189 param->name = mtd->name;
2191 /* Set up the memory size parameters.... */
2194 YCALCBLOCKS(mtd->size,
2195 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2197 param->start_block = 0;
2198 param->end_block = n_blocks - 1;
2199 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2200 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2201 param->n_reserved_blocks = 5;
2202 param->n_caches = (options.no_cache) ? 0 : 10;
2203 param->inband_tags = options.inband_tags;
2205 param->disable_lazy_load = 1;
2206 param->enable_xattr = 1;
2207 if (options.lazy_loading_overridden)
2208 param->disable_lazy_load = !options.lazy_loading_enabled;
2210 param->defered_dir_update = 1;
2212 if (options.tags_ecc_overridden)
2213 param->no_tags_ecc = !options.tags_ecc_on;
2215 param->empty_lost_n_found = 1;
2217 param->refresh_period = 500;
2219 if (options.empty_lost_and_found_overridden)
2220 param->empty_lost_n_found = options.empty_lost_and_found;
2222 /* ... and the functions. */
2223 if (yaffs_version == 2) {
2224 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2225 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2226 param->bad_block_fn = nandmtd2_mark_block_bad;
2227 param->query_block_fn = nandmtd2_query_block;
2228 yaffs_dev_to_lc(dev)->spare_buffer =
2229 kmalloc(mtd->oobsize, GFP_NOFS);
2230 param->is_yaffs2 = 1;
2231 param->total_bytes_per_chunk = mtd->writesize;
2232 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2233 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2235 param->start_block = 0;
2236 param->end_block = n_blocks - 1;
2238 /* use the MTD interface in yaffs_mtdif1.c */
2239 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2240 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2241 param->bad_block_fn = nandmtd1_mark_block_bad;
2242 param->query_block_fn = nandmtd1_query_block;
2243 param->is_yaffs2 = 0;
2245 /* ... and common functions */
2246 param->erase_fn = nandmtd_erase_block;
2247 param->initialise_flash_fn = nandmtd_initialise;
2249 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2251 param->sb_dirty_fn = yaffs_touch_super;
2252 param->gc_control_fn = yaffs_gc_control_callback;
2254 yaffs_dev_to_lc(dev)->super = sb;
2256 param->use_nand_ecc = 1;
2258 param->skip_checkpt_rd = options.skip_checkpoint_read;
2259 param->skip_checkpt_wr = options.skip_checkpoint_write;
2261 mutex_lock(&yaffs_context_lock);
2262 /* Get a mount id */
2263 for (mount_id = 0, found = 0; !found; mount_id++) {
2265 list_for_each(l, &yaffs_context_list) {
2267 list_entry(l, struct yaffs_linux_context,
2269 if (context_iterator->mount_id == mount_id)
2273 context->mount_id = mount_id;
2275 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2276 &yaffs_context_list);
2277 mutex_unlock(&yaffs_context_lock);
2279 /* Directory search handling... */
2280 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2281 param->remove_obj_fn = yaffs_remove_obj_callback;
2283 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2285 yaffs_gross_lock(dev);
2287 err = yaffs_guts_initialise(dev);
2289 yaffs_trace(YAFFS_TRACE_OS,
2290 "yaffs_read_super: guts initialised %s",
2291 (err == YAFFS_OK) ? "OK" : "FAILED");
2293 if (err == YAFFS_OK)
2294 yaffs_bg_start(dev);
2296 if (!context->bg_thread)
2297 param->defered_dir_update = 0;
2299 sb->s_maxbytes = yaffs_max_file_size(dev);
2301 /* Release lock before yaffs_get_inode() */
2302 yaffs_gross_unlock(dev);
2304 /* Create root inode */
2305 if (err == YAFFS_OK)
2306 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2311 inode->i_op = &yaffs_dir_inode_operations;
2312 inode->i_fop = &yaffs_dir_operations;
2314 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
2316 root = d_alloc_root(inode);
2318 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
2325 sb->s_dirt = !dev->is_checkpointed;
2326 yaffs_trace(YAFFS_TRACE_ALWAYS,
2327 "yaffs_read_super: is_checkpointed %d",
2328 dev->is_checkpointed);
2330 yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
2334 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2337 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2340 static struct dentry *yaffs_mount(struct file_system_type *fs,
2341 int flags, const char *dev_name,
2344 return mount_bdev(fs, flags, dev_name, data,
2345 yaffs_internal_read_super_mtd);
2348 static struct file_system_type yaffs_fs_type = {
2349 .owner = THIS_MODULE,
2351 .mount = yaffs_mount,
2352 .kill_sb = kill_block_super,
2353 .fs_flags = FS_REQUIRES_DEV,
2356 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2359 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2362 static struct dentry *yaffs2_mount(struct file_system_type *fs,
2363 int flags, const char *dev_name, void *data)
2365 return mount_bdev(fs, flags, dev_name, data,
2366 yaffs2_internal_read_super_mtd);
2369 static struct file_system_type yaffs2_fs_type = {
2370 .owner = THIS_MODULE,
2372 .mount = yaffs2_mount,
2373 .kill_sb = kill_block_super,
2374 .fs_flags = FS_REQUIRES_DEV,
2378 static struct proc_dir_entry *my_proc_entry;
2380 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
2382 struct yaffs_param *param = &dev->param;
2384 buf += sprintf(buf, "start_block........... %d\n", param->start_block);
2385 buf += sprintf(buf, "end_block............. %d\n", param->end_block);
2386 buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
2387 param->total_bytes_per_chunk);
2388 buf += sprintf(buf, "use_nand_ecc.......... %d\n",
2389 param->use_nand_ecc);
2390 buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
2391 buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
2392 buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
2393 buf += sprintf(buf, "empty_lost_n_found.... %d\n",
2394 param->empty_lost_n_found);
2395 buf += sprintf(buf, "disable_lazy_load..... %d\n",
2396 param->disable_lazy_load);
2397 buf += sprintf(buf, "refresh_period........ %d\n",
2398 param->refresh_period);
2399 buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
2400 buf += sprintf(buf, "n_reserved_blocks..... %d\n",
2401 param->n_reserved_blocks);
2402 buf += sprintf(buf, "always_check_erased... %d\n",
2403 param->always_check_erased);
2408 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
2410 buf += sprintf(buf, "max file size......... %lld\n",
2411 (long long) yaffs_max_file_size(dev));
2412 buf += sprintf(buf, "data_bytes_per_chunk.. %d\n",
2413 dev->data_bytes_per_chunk);
2414 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2415 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2417 sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2419 sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2420 buf += sprintf(buf, "\n");
2421 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2422 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2423 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2424 buf += sprintf(buf, "\n");
2425 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2426 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2427 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2428 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2429 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2431 sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2433 sprintf(buf, "oldest_dirty_gc_count. %u\n",
2434 dev->oldest_dirty_gc_count);
2435 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2436 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2438 sprintf(buf, "n_retried_writes...... %u\n", dev->n_retried_writes);
2440 sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2441 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2442 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2444 sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2446 sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
2447 dev->n_tags_ecc_unfixed);
2448 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2450 sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2452 sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2453 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2454 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2459 static int yaffs_proc_read(char *page,
2461 off_t offset, int count, int *eof, void *data)
2463 struct list_head *item;
2468 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2469 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2470 * This also assumes the user has posted a read buffer large
2471 * enough to hold the complete output; but that's life in /proc.
2476 /* Print header first */
2478 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
2480 buf += sprintf(buf, "\n");
2484 mutex_lock(&yaffs_context_lock);
2486 /* Locate and print the Nth entry.
2487 * Order N-squared but N is small. */
2488 list_for_each(item, &yaffs_context_list) {
2489 struct yaffs_linux_context *dc =
2490 list_entry(item, struct yaffs_linux_context,
2492 struct yaffs_dev *dev = dc->dev;
2494 if (n < (step & ~1)) {
2498 if ((step & 1) == 0) {
2500 sprintf(buf, "\nDevice %d \"%s\"\n", n,
2502 buf = yaffs_dump_dev_part0(buf, dev);
2504 buf = yaffs_dump_dev_part1(buf, dev);
2509 mutex_unlock(&yaffs_context_lock);
2512 return buf - page < count ? buf - page : count;
2517 /* Stuff to handle installation of file systems */
2518 struct file_system_to_install {
2519 struct file_system_type *fst;
2523 static struct file_system_to_install fs_to_install[] = {
2524 {&yaffs_fs_type, 0},
2525 {&yaffs2_fs_type, 0},
2529 static int __init init_yaffs_fs(void)
2532 struct file_system_to_install *fsinst;
2534 yaffs_trace(YAFFS_TRACE_ALWAYS,
2535 "yaffs built " __DATE__ " " __TIME__ " Installing.");
2537 mutex_init(&yaffs_context_lock);
2539 /* Install the proc_fs entries */
2540 my_proc_entry = create_proc_entry("yaffs",
2541 S_IRUGO | S_IFREG, NULL);
2543 if (my_proc_entry) {
2544 my_proc_entry->write_proc = NULL;
2545 my_proc_entry->read_proc = yaffs_proc_read;
2546 my_proc_entry->data = NULL;
2552 /* Now add the file system entries */
2554 fsinst = fs_to_install;
2556 while (fsinst->fst && !error) {
2557 error = register_filesystem(fsinst->fst);
2559 fsinst->installed = 1;
2563 /* Any errors? uninstall */
2565 fsinst = fs_to_install;
2567 while (fsinst->fst) {
2568 if (fsinst->installed) {
2569 unregister_filesystem(fsinst->fst);
2570 fsinst->installed = 0;
2579 static void __exit exit_yaffs_fs(void)
2582 struct file_system_to_install *fsinst;
2584 yaffs_trace(YAFFS_TRACE_ALWAYS,
2585 "yaffs built " __DATE__ " " __TIME__ " removing.");
2587 remove_proc_entry("yaffs", NULL);
2589 fsinst = fs_to_install;
2591 while (fsinst->fst) {
2592 if (fsinst->installed) {
2593 unregister_filesystem(fsinst->fst);
2594 fsinst->installed = 0;
2600 module_init(init_yaffs_fs)
2601 module_exit(exit_yaffs_fs)
2603 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2604 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
2605 MODULE_LICENSE("GPL");