2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * Luc van OostenRyck for numerous patches.
10 * Nick Bane for numerous patches.
11 * Nick Bane for 2.5/2.6 integration.
12 * Andras Toth for mknod rdev issue.
13 * Michael Fischer for finding the problem with inode inconsistency.
14 * Some code bodily lifted from JFFS
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
23 * This is the file system front-end to YAFFS that hooks it up to
27 * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
29 * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
31 * >> inode->u.generic_ip points to the associated struct yaffs_obj.
35 * NB There are two variants of Linux VFS glue code. This variant supports
36 * a single version and should not include any multi-version code.
38 #include <linux/version.h>
40 #include <linux/kernel.h>
41 #include <linux/module.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
45 #include <linux/proc_fs.h>
46 #include <linux/smp_lock.h>
47 #include <linux/pagemap.h>
48 #include <linux/mtd/mtd.h>
49 #include <linux/interrupt.h>
50 #include <linux/string.h>
51 #include <linux/ctype.h>
52 #include <linux/namei.h>
53 #include <linux/exportfs.h>
54 #include <linux/kthread.h>
55 #include <linux/delay.h>
56 #include <linux/freezer.h>
58 #include <asm/div64.h>
60 #include <linux/statfs.h>
62 #define UnlockPage(p) unlock_page(p)
63 #define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
65 #define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
67 #define YPROC_ROOT NULL
69 #define Y_INIT_TIMER(a) init_timer_on_stack(a)
71 #define WRITE_SIZE_STR "writesize"
72 #define WRITE_SIZE(mtd) ((mtd)->writesize)
74 static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
76 uint64_t result = partition_size;
77 do_div(result, block_size);
78 return (uint32_t) result;
81 #include <linux/uaccess.h>
82 #include <linux/mtd/mtd.h>
85 #include "yaffs_trace.h"
86 #include "yaffs_guts.h"
87 #include "yaffs_attribs.h"
89 #include "yaffs_linux.h"
91 #include "yaffs_mtdif.h"
92 #include "yaffs_mtdif1.h"
93 #include "yaffs_mtdif2.h"
95 unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
96 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
97 unsigned int yaffs_auto_checkpoint = 1;
98 unsigned int yaffs_gc_control = 1;
99 unsigned int yaffs_bg_enable = 1;
101 /* Module Parameters */
102 module_param(yaffs_trace_mask, uint, 0644);
103 module_param(yaffs_wr_attempts, uint, 0644);
104 module_param(yaffs_auto_checkpoint, uint, 0644);
105 module_param(yaffs_gc_control, uint, 0644);
106 module_param(yaffs_bg_enable, uint, 0644);
108 #define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
110 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
112 #define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
113 #define yaffs_inode_to_obj(iptr) ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
114 #define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
115 #define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
117 #define update_dir_time(dir) do {\
118 (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
121 static void yaffs_put_super(struct super_block *sb);
123 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
125 static ssize_t yaffs_hold_space(struct file *f);
126 static void yaffs_release_space(struct file *f);
128 static int yaffs_file_flush(struct file *file, fl_owner_t id);
130 static int yaffs_sync_object(struct file *file, int datasync);
132 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
134 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
135 struct nameidata *n);
136 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
137 struct nameidata *n);
138 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
139 struct dentry *dentry);
140 static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
141 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
142 const char *symname);
143 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
145 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
147 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
148 struct inode *new_dir, struct dentry *new_dentry);
149 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
151 static int yaffs_sync_fs(struct super_block *sb, int wait);
152 static void yaffs_write_super(struct super_block *sb);
154 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
156 #ifdef YAFFS_HAS_PUT_INODE
157 static void yaffs_put_inode(struct inode *inode);
160 static void yaffs_evict_inode(struct inode *);
162 static int yaffs_readpage(struct file *file, struct page *page);
163 static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
165 #ifdef CONFIG_YAFFS_XATTR
166 int yaffs_setxattr(struct dentry *dentry, const char *name,
167 const void *value, size_t size, int flags);
168 ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
170 int yaffs_removexattr(struct dentry *dentry, const char *name);
171 ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
174 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
175 loff_t pos, unsigned len, unsigned flags,
176 struct page **pagep, void **fsdata);
177 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
178 loff_t pos, unsigned len, unsigned copied,
179 struct page *pg, void *fsdadata);
181 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
183 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
184 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
186 static void yaffs_touch_super(struct yaffs_dev *dev);
188 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
190 static int yaffs_vfs_setattr(struct inode *, struct iattr *);
192 static struct address_space_operations yaffs_file_address_operations = {
193 .readpage = yaffs_readpage,
194 .writepage = yaffs_writepage,
195 .write_begin = yaffs_write_begin,
196 .write_end = yaffs_write_end,
199 static const struct file_operations yaffs_file_operations = {
200 .read = do_sync_read,
201 .write = do_sync_write,
202 .aio_read = generic_file_aio_read,
203 .aio_write = generic_file_aio_write,
204 .mmap = generic_file_mmap,
205 .flush = yaffs_file_flush,
206 .fsync = yaffs_sync_object,
207 .splice_read = generic_file_splice_read,
208 .splice_write = generic_file_splice_write,
209 .llseek = generic_file_llseek,
212 static const struct inode_operations yaffs_file_inode_operations = {
213 .setattr = yaffs_setattr,
214 #ifdef CONFIG_YAFFS_XATTR
215 .setxattr = yaffs_setxattr,
216 .getxattr = yaffs_getxattr,
217 .listxattr = yaffs_listxattr,
218 .removexattr = yaffs_removexattr,
222 static const struct inode_operations yaffs_symlink_inode_operations = {
223 .readlink = yaffs_readlink,
224 .follow_link = yaffs_follow_link,
225 .put_link = yaffs_put_link,
226 .setattr = yaffs_setattr,
227 #ifdef CONFIG_YAFFS_XATTR
228 .setxattr = yaffs_setxattr,
229 .getxattr = yaffs_getxattr,
230 .listxattr = yaffs_listxattr,
231 .removexattr = yaffs_removexattr,
235 static const struct inode_operations yaffs_dir_inode_operations = {
236 .create = yaffs_create,
237 .lookup = yaffs_lookup,
239 .unlink = yaffs_unlink,
240 .symlink = yaffs_symlink,
241 .mkdir = yaffs_mkdir,
242 .rmdir = yaffs_unlink,
243 .mknod = yaffs_mknod,
244 .rename = yaffs_rename,
245 .setattr = yaffs_setattr,
246 #ifdef CONFIG_YAFFS_XATTR
247 .setxattr = yaffs_setxattr,
248 .getxattr = yaffs_getxattr,
249 .listxattr = yaffs_listxattr,
250 .removexattr = yaffs_removexattr,
254 static const struct file_operations yaffs_dir_operations = {
255 .read = generic_read_dir,
256 .readdir = yaffs_readdir,
257 .fsync = yaffs_sync_object,
258 .llseek = yaffs_dir_llseek,
261 static const struct super_operations yaffs_super_ops = {
262 .statfs = yaffs_statfs,
263 #ifdef YAFFS_HAS_PUT_INODE
264 .put_inode = yaffs_put_inode,
266 .put_super = yaffs_put_super,
267 .evict_inode = yaffs_evict_inode,
268 .sync_fs = yaffs_sync_fs,
269 .write_super = yaffs_write_super,
272 static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
274 setattr_copy(inode, attr);
278 static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
280 truncate_setsize(inode, newsize);
284 static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
286 return yaffs_gc_control;
289 static void yaffs_gross_lock(struct yaffs_dev *dev)
291 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
292 mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
293 T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
296 static void yaffs_gross_unlock(struct yaffs_dev *dev)
298 T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
299 mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
302 /* ExportFS support */
303 static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
306 return Y_IGET(sb, ino);
309 static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
310 struct fid *fid, int fh_len,
313 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
314 yaffs2_nfs_get_inode);
317 static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
318 struct fid *fid, int fh_len,
321 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
322 yaffs2_nfs_get_inode);
325 struct dentry *yaffs2_get_parent(struct dentry *dentry)
328 struct super_block *sb = dentry->d_inode->i_sb;
329 struct dentry *parent = ERR_PTR(-ENOENT);
331 unsigned long parent_ino;
332 struct yaffs_obj *d_obj;
333 struct yaffs_obj *parent_obj;
335 d_obj = yaffs_inode_to_obj(dentry->d_inode);
338 parent_obj = d_obj->parent;
340 parent_ino = yaffs_get_obj_inode(parent_obj);
341 inode = Y_IGET(sb, parent_ino);
344 parent = ERR_CAST(inode);
346 parent = d_obtain_alias(inode);
347 if (!IS_ERR(parent)) {
348 parent = ERR_PTR(-ENOMEM);
358 /* Just declare a zero structure as a NULL value implies
359 * using the default functions of exportfs.
362 static struct export_operations yaffs_export_ops = {
363 .fh_to_dentry = yaffs2_fh_to_dentry,
364 .fh_to_parent = yaffs2_fh_to_parent,
365 .get_parent = yaffs2_get_parent,
368 /*-----------------------------------------------------------------*/
369 /* Directory search context allows us to unlock access to yaffs during
370 * filldir without causing problems with the directory being modified.
371 * This is similar to the tried and tested mechanism used in yaffs direct.
373 * A search context iterates along a doubly linked list of siblings in the
374 * directory. If the iterating object is deleted then this would corrupt
375 * the list iteration, likely causing a crash. The search context avoids
376 * this by using the remove_obj_fn to move the search context to the
377 * next object before the object is deleted.
379 * Many readdirs (and thus seach conexts) may be alive simulateously so
380 * each struct yaffs_dev has a list of these.
382 * A seach context lives for the duration of a readdir.
384 * All these functions must be called while yaffs is locked.
387 struct yaffs_search_context {
388 struct yaffs_dev *dev;
389 struct yaffs_obj *dir_obj;
390 struct yaffs_obj *next_return;
391 struct list_head others;
395 * yaffs_new_search() creates a new search context, initialises it and
396 * adds it to the device's search context list.
398 * Called at start of readdir.
400 static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
402 struct yaffs_dev *dev = dir->my_dev;
403 struct yaffs_search_context *sc =
404 YMALLOC(sizeof(struct yaffs_search_context));
408 if (list_empty(&sc->dir_obj->variant.dir_variant.children))
409 sc->next_return = NULL;
412 list_entry(dir->variant.dir_variant.children.next,
413 struct yaffs_obj, siblings);
414 INIT_LIST_HEAD(&sc->others);
415 list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
421 * yaffs_search_end() disposes of a search context and cleans up.
423 static void yaffs_search_end(struct yaffs_search_context *sc)
426 list_del(&sc->others);
432 * yaffs_search_advance() moves a search context to the next object.
433 * Called when the search iterates or when an object removal causes
434 * the search context to be moved to the next object.
436 static void yaffs_search_advance(struct yaffs_search_context *sc)
441 if (sc->next_return == NULL ||
442 list_empty(&sc->dir_obj->variant.dir_variant.children))
443 sc->next_return = NULL;
445 struct list_head *next = sc->next_return->siblings.next;
447 if (next == &sc->dir_obj->variant.dir_variant.children)
448 sc->next_return = NULL; /* end of list */
451 list_entry(next, struct yaffs_obj, siblings);
456 * yaffs_remove_obj_callback() is called when an object is unlinked.
457 * We check open search contexts and advance any which are currently
458 * on the object being iterated.
460 static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
464 struct yaffs_search_context *sc;
465 struct list_head *search_contexts =
466 &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
468 /* Iterate through the directory search contexts.
469 * If any are currently on the object being removed, then advance
470 * the search context to the next object to prevent a hanging pointer.
472 list_for_each(i, search_contexts) {
474 sc = list_entry(i, struct yaffs_search_context, others);
475 if (sc->next_return == obj)
476 yaffs_search_advance(sc);
482 /*-----------------------------------------------------------------*/
484 static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
487 unsigned char *alias;
490 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
492 yaffs_gross_lock(dev);
494 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
496 yaffs_gross_unlock(dev);
501 ret = vfs_readlink(dentry, buffer, buflen, alias);
506 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
508 unsigned char *alias;
510 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
512 yaffs_gross_lock(dev);
514 alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
515 yaffs_gross_unlock(dev);
518 ret = ERR_PTR(-ENOMEM);
522 nd_set_link(nd, alias);
528 void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
533 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
534 struct yaffs_obj *obj);
537 * Lookup is used to find objects in the fs
540 static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
543 struct yaffs_obj *obj;
544 struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
546 struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
548 if (current != yaffs_dev_to_lc(dev)->readdir_process)
549 yaffs_gross_lock(dev);
552 (TSTR("yaffs_lookup for %d:%s\n"),
553 yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name));
555 obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
557 obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
559 /* Can't hold gross lock when calling yaffs_get_inode() */
560 if (current != yaffs_dev_to_lc(dev)->readdir_process)
561 yaffs_gross_unlock(dev);
565 (TSTR("yaffs_lookup found %d\n"), obj->obj_id));
567 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
570 T(YAFFS_TRACE_OS, (TSTR("yaffs_loookup dentry \n")));
571 d_add(dentry, inode);
577 T(YAFFS_TRACE_OS, (TSTR("yaffs_lookup not found\n")));
581 d_add(dentry, inode);
586 #ifdef YAFFS_HAS_PUT_INODE
588 /* For now put inode is just for debugging
589 * Put inode is called when the inode **structure** is put.
591 static void yaffs_put_inode(struct inode *inode)
594 (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
595 atomic_read(&inode->i_count)));
600 static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
602 /* Clear the association between the inode and
603 * the struct yaffs_obj.
605 obj->my_inode = NULL;
606 yaffs_inode_to_obj_lv(inode) = NULL;
608 /* If the object freeing was deferred, then the real
610 * This should fix the inode inconsistency problem.
612 yaffs_handle_defered_free(obj);
615 /* yaffs_evict_inode combines into one operation what was previously done in
616 * yaffs_clear_inode() and yaffs_delete_inode()
619 static void yaffs_evict_inode(struct inode *inode)
621 struct yaffs_obj *obj;
622 struct yaffs_dev *dev;
625 obj = yaffs_inode_to_obj(inode);
628 (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
629 atomic_read(&inode->i_count),
630 obj ? "object exists" : "null object"));
632 if (!inode->i_nlink && !is_bad_inode(inode))
634 truncate_inode_pages(&inode->i_data, 0);
635 end_writeback(inode);
637 if (deleteme && obj) {
639 yaffs_gross_lock(dev);
641 yaffs_gross_unlock(dev);
645 yaffs_gross_lock(dev);
646 yaffs_unstitch_obj(inode, obj);
647 yaffs_gross_unlock(dev);
652 static int yaffs_file_flush(struct file *file, fl_owner_t id)
654 struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
656 struct yaffs_dev *dev = obj->my_dev;
659 (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id,
660 obj->dirty ? "dirty" : "clean"));
662 yaffs_gross_lock(dev);
664 yaffs_flush_file(obj, 1, 0);
666 yaffs_gross_unlock(dev);
671 static int yaffs_readpage_nolock(struct file *f, struct page *pg)
673 /* Lifted from jffs2 */
675 struct yaffs_obj *obj;
676 unsigned char *pg_buf;
679 struct yaffs_dev *dev;
682 (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
683 (unsigned)(pg->index << PAGE_CACHE_SHIFT),
684 (unsigned)PAGE_CACHE_SIZE));
686 obj = yaffs_dentry_to_obj(f->f_dentry);
690 BUG_ON(!PageLocked(pg));
693 /* FIXME: Can kmap fail? */
695 yaffs_gross_lock(dev);
697 ret = yaffs_file_rd(obj, pg_buf,
698 pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
700 yaffs_gross_unlock(dev);
706 ClearPageUptodate(pg);
713 flush_dcache_page(pg);
716 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
720 static int yaffs_readpage_unlock(struct file *f, struct page *pg)
722 int ret = yaffs_readpage_nolock(f, pg);
727 static int yaffs_readpage(struct file *f, struct page *pg)
731 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
732 ret = yaffs_readpage_unlock(f, pg);
733 T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
737 /* writepage inspired by/stolen from smbfs */
739 static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
741 struct yaffs_dev *dev;
742 struct address_space *mapping = page->mapping;
744 unsigned long end_index;
746 struct yaffs_obj *obj;
753 inode = mapping->host;
756 i_size = i_size_read(inode);
758 end_index = i_size >> PAGE_CACHE_SHIFT;
760 if (page->index < end_index)
761 n_bytes = PAGE_CACHE_SIZE;
763 n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
765 if (page->index > end_index || !n_bytes) {
768 ("yaffs_writepage at %08x, inode size = %08x!!!\n"),
769 (unsigned)(page->index << PAGE_CACHE_SHIFT),
770 (unsigned)inode->i_size));
772 (TSTR(" -> don't care!!\n")));
774 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
775 set_page_writeback(page);
777 end_page_writeback(page);
782 if (n_bytes != PAGE_CACHE_SIZE)
783 zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
789 obj = yaffs_inode_to_obj(inode);
791 yaffs_gross_lock(dev);
794 (TSTR("yaffs_writepage at %08x, size %08x\n"),
795 (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes));
797 (TSTR("writepag0: obj = %05x, ino = %05x\n"),
798 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
800 n_written = yaffs_wr_file(obj, buffer,
801 page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
803 yaffs_touch_super(dev);
806 (TSTR("writepag1: obj = %05x, ino = %05x\n"),
807 (int)obj->variant.file_variant.file_size, (int)inode->i_size));
809 yaffs_gross_unlock(dev);
812 set_page_writeback(page);
814 end_page_writeback(page);
817 return (n_written == n_bytes) ? 0 : -ENOSPC;
820 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
821 loff_t pos, unsigned len, unsigned flags,
822 struct page **pagep, void **fsdata)
824 struct page *pg = NULL;
825 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
831 pg = grab_cache_page_write_begin(mapping, index, flags);
839 (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
840 (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0));
843 space_held = yaffs_hold_space(filp);
850 /* Update page if required */
852 if (!Page_Uptodate(pg))
853 ret = yaffs_readpage_nolock(filp, pg);
858 /* Happy path return */
859 T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
865 (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
867 yaffs_release_space(filp);
870 page_cache_release(pg);
875 static int yaffs_write_end(struct file *filp, struct address_space *mapping,
876 loff_t pos, unsigned len, unsigned copied,
877 struct page *pg, void *fsdadata)
881 uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
884 addr = kva + offset_into_page;
887 ("yaffs_write_end addr %p pos %x n_bytes %d\n",
888 addr, (unsigned)pos, copied));
890 ret = yaffs_file_write(filp, addr, copied, &pos);
894 (TSTR("yaffs_write_end not same size ret %d copied %d\n"),
903 yaffs_release_space(filp);
905 page_cache_release(pg);
909 static void yaffs_fill_inode_from_obj(struct inode *inode,
910 struct yaffs_obj *obj)
914 /* Check mode against the variant type and attempt to repair if broken. */
915 u32 mode = obj->yst_mode;
916 switch (obj->variant_type) {
917 case YAFFS_OBJECT_TYPE_FILE:
918 if (!S_ISREG(mode)) {
919 obj->yst_mode &= ~S_IFMT;
920 obj->yst_mode |= S_IFREG;
924 case YAFFS_OBJECT_TYPE_SYMLINK:
925 if (!S_ISLNK(mode)) {
926 obj->yst_mode &= ~S_IFMT;
927 obj->yst_mode |= S_IFLNK;
931 case YAFFS_OBJECT_TYPE_DIRECTORY:
932 if (!S_ISDIR(mode)) {
933 obj->yst_mode &= ~S_IFMT;
934 obj->yst_mode |= S_IFDIR;
938 case YAFFS_OBJECT_TYPE_UNKNOWN:
939 case YAFFS_OBJECT_TYPE_HARDLINK:
940 case YAFFS_OBJECT_TYPE_SPECIAL:
946 inode->i_flags |= S_NOATIME;
948 inode->i_ino = obj->obj_id;
949 inode->i_mode = obj->yst_mode;
950 inode->i_uid = obj->yst_uid;
951 inode->i_gid = obj->yst_gid;
953 inode->i_rdev = old_decode_dev(obj->yst_rdev);
955 inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
956 inode->i_atime.tv_nsec = 0;
957 inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
958 inode->i_mtime.tv_nsec = 0;
959 inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
960 inode->i_ctime.tv_nsec = 0;
961 inode->i_size = yaffs_get_obj_length(obj);
962 inode->i_blocks = (inode->i_size + 511) >> 9;
964 inode->i_nlink = yaffs_get_obj_link_count(obj);
968 ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"),
969 inode->i_mode, inode->i_uid, inode->i_gid,
970 (int)inode->i_size, atomic_read(&inode->i_count)));
972 switch (obj->yst_mode & S_IFMT) {
973 default: /* fifo, device or socket */
974 init_special_inode(inode, obj->yst_mode,
975 old_decode_dev(obj->yst_rdev));
977 case S_IFREG: /* file */
978 inode->i_op = &yaffs_file_inode_operations;
979 inode->i_fop = &yaffs_file_operations;
980 inode->i_mapping->a_ops =
981 &yaffs_file_address_operations;
983 case S_IFDIR: /* directory */
984 inode->i_op = &yaffs_dir_inode_operations;
985 inode->i_fop = &yaffs_dir_operations;
987 case S_IFLNK: /* symlink */
988 inode->i_op = &yaffs_symlink_inode_operations;
992 yaffs_inode_to_obj_lv(inode) = obj;
994 obj->my_inode = inode;
998 (TSTR("yaffs_fill_inode invalid parameters\n")));
1003 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
1004 struct yaffs_obj *obj)
1006 struct inode *inode;
1010 (TSTR("yaffs_get_inode for NULL super_block!!\n")));
1017 (TSTR("yaffs_get_inode for NULL object!!\n")));
1023 (TSTR("yaffs_get_inode for object %d\n"), obj->obj_id));
1025 inode = Y_IGET(sb, obj->obj_id);
1029 /* NB Side effect: iget calls back to yaffs_read_inode(). */
1030 /* iget also increments the inode's i_count */
1031 /* NB You can't be holding gross_lock or deadlock will happen! */
1036 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
1039 struct yaffs_obj *obj;
1040 int n_written, ipos;
1041 struct inode *inode;
1042 struct yaffs_dev *dev;
1044 obj = yaffs_dentry_to_obj(f->f_dentry);
1048 yaffs_gross_lock(dev);
1050 inode = f->f_dentry->d_inode;
1052 if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
1053 ipos = inode->i_size;
1059 (TSTR("yaffs_file_write: hey obj is null!\n")));
1062 (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
1063 "to object %d at %d(%x)\n"),
1064 (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos));
1066 n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
1068 yaffs_touch_super(dev);
1071 (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
1072 (unsigned)n, (unsigned)n));
1074 if (n_written > 0) {
1077 if (ipos > inode->i_size) {
1078 inode->i_size = ipos;
1079 inode->i_blocks = (ipos + 511) >> 9;
1082 (TSTR("yaffs_file_write size updated to %d bytes, "
1083 "%d blocks\n"), ipos, (int)(inode->i_blocks)));
1087 yaffs_gross_unlock(dev);
1088 return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
1091 /* Space holding and freeing is done to ensure we have space available for write_begin/end */
1092 /* For now we just assume few parallel writes and check against a small number. */
1093 /* Todo: need to do this with a counter to handle parallel reads better */
1095 static ssize_t yaffs_hold_space(struct file *f)
1097 struct yaffs_obj *obj;
1098 struct yaffs_dev *dev;
1102 obj = yaffs_dentry_to_obj(f->f_dentry);
1106 yaffs_gross_lock(dev);
1108 n_free_chunks = yaffs_get_n_free_chunks(dev);
1110 yaffs_gross_unlock(dev);
1112 return (n_free_chunks > 20) ? 1 : 0;
1115 static void yaffs_release_space(struct file *f)
1117 struct yaffs_obj *obj;
1118 struct yaffs_dev *dev;
1120 obj = yaffs_dentry_to_obj(f->f_dentry);
1124 yaffs_gross_lock(dev);
1126 yaffs_gross_unlock(dev);
1129 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
1137 offset += i_size_read(file->f_path.dentry->d_inode);
1140 offset += file->f_pos;
1145 if (offset != file->f_pos)
1146 file->f_pos = offset;
1154 static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
1156 struct yaffs_obj *obj;
1157 struct yaffs_dev *dev;
1158 struct yaffs_search_context *sc;
1159 struct inode *inode = f->f_dentry->d_inode;
1160 unsigned long offset, curoffs;
1161 struct yaffs_obj *l;
1164 char name[YAFFS_MAX_NAME_LENGTH + 1];
1166 obj = yaffs_dentry_to_obj(f->f_dentry);
1169 yaffs_gross_lock(dev);
1171 yaffs_dev_to_lc(dev)->readdir_process = current;
1175 sc = yaffs_new_search(obj);
1182 (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
1186 (TSTR("yaffs_readdir: entry . ino %d \n"),
1187 (int)inode->i_ino));
1188 yaffs_gross_unlock(dev);
1189 if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
1190 yaffs_gross_lock(dev);
1193 yaffs_gross_lock(dev);
1199 (TSTR("yaffs_readdir: entry .. ino %d \n"),
1200 (int)f->f_dentry->d_parent->d_inode->i_ino));
1201 yaffs_gross_unlock(dev);
1202 if (filldir(dirent, "..", 2, offset,
1203 f->f_dentry->d_parent->d_inode->i_ino,
1205 yaffs_gross_lock(dev);
1208 yaffs_gross_lock(dev);
1215 /* If the directory has changed since the open or last call to
1216 readdir, rewind to after the 2 canned entries. */
1217 if (f->f_version != inode->i_version) {
1220 f->f_version = inode->i_version;
1223 while (sc->next_return) {
1225 l = sc->next_return;
1226 if (curoffs >= offset) {
1227 int this_inode = yaffs_get_obj_inode(l);
1228 int this_type = yaffs_get_obj_type(l);
1230 yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
1232 (TSTR("yaffs_readdir: %s inode %d\n"),
1233 name, yaffs_get_obj_inode(l)));
1235 yaffs_gross_unlock(dev);
1240 offset, this_inode, this_type) < 0) {
1241 yaffs_gross_lock(dev);
1245 yaffs_gross_lock(dev);
1250 yaffs_search_advance(sc);
1254 yaffs_search_end(sc);
1255 yaffs_dev_to_lc(dev)->readdir_process = NULL;
1256 yaffs_gross_unlock(dev);
1262 * File creation. Allocate an inode, and we're done..
1265 #define YCRED(x) (x->cred)
1267 static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
1270 struct inode *inode;
1272 struct yaffs_obj *obj = NULL;
1273 struct yaffs_dev *dev;
1275 struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
1277 int error = -ENOSPC;
1278 uid_t uid = YCRED(current)->fsuid;
1280 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1282 if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
1287 (TSTR("yaffs_mknod: parent object %d type %d\n"),
1288 parent->obj_id, parent->variant_type));
1291 (TSTR("yaffs_mknod: could not get parent object\n")));
1295 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
1296 "mode %x dev %x\n"),
1297 dentry->d_name.name, mode, rdev));
1299 dev = parent->my_dev;
1301 yaffs_gross_lock(dev);
1303 switch (mode & S_IFMT) {
1305 /* Special (socket, fifo, device...) */
1306 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
1308 yaffs_create_special(parent, dentry->d_name.name, mode, uid,
1309 gid, old_encode_dev(rdev));
1311 case S_IFREG: /* file */
1312 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
1313 obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
1316 case S_IFDIR: /* directory */
1317 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n")));
1318 obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
1321 case S_IFLNK: /* symlink */
1322 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
1323 obj = NULL; /* Do we ever get here? */
1327 /* Can not call yaffs_get_inode() with gross lock held */
1328 yaffs_gross_unlock(dev);
1331 inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
1332 d_instantiate(dentry, inode);
1333 update_dir_time(dir);
1335 (TSTR("yaffs_mknod created object %d count = %d\n"),
1336 obj->obj_id, atomic_read(&inode->i_count)));
1338 yaffs_fill_inode_from_obj(dir, parent);
1340 T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n")));
1347 static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1350 T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
1351 ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
1355 static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
1356 struct nameidata *n)
1358 T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n")));
1359 return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
1362 static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
1366 struct yaffs_dev *dev;
1367 struct yaffs_obj *obj;
1370 (TSTR("yaffs_unlink %d:%s\n"),
1371 (int)(dir->i_ino), dentry->d_name.name));
1372 obj = yaffs_inode_to_obj(dir);
1375 yaffs_gross_lock(dev);
1377 ret_val = yaffs_unlinker(obj, dentry->d_name.name);
1379 if (ret_val == YAFFS_OK) {
1380 dentry->d_inode->i_nlink--;
1382 yaffs_gross_unlock(dev);
1383 mark_inode_dirty(dentry->d_inode);
1384 update_dir_time(dir);
1387 yaffs_gross_unlock(dev);
1394 static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
1395 struct dentry *dentry)
1397 struct inode *inode = old_dentry->d_inode;
1398 struct yaffs_obj *obj = NULL;
1399 struct yaffs_obj *link = NULL;
1400 struct yaffs_dev *dev;
1402 T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
1404 obj = yaffs_inode_to_obj(inode);
1407 yaffs_gross_lock(dev);
1409 if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
1411 yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
1415 old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
1416 d_instantiate(dentry, old_dentry->d_inode);
1417 atomic_inc(&old_dentry->d_inode->i_count);
1419 (TSTR("yaffs_link link count %d i_count %d\n"),
1420 old_dentry->d_inode->i_nlink,
1421 atomic_read(&old_dentry->d_inode->i_count)));
1424 yaffs_gross_unlock(dev);
1427 update_dir_time(dir);
1434 static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
1435 const char *symname)
1437 struct yaffs_obj *obj;
1438 struct yaffs_dev *dev;
1439 uid_t uid = YCRED(current)->fsuid;
1441 (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
1443 T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
1445 dev = yaffs_inode_to_obj(dir)->my_dev;
1446 yaffs_gross_lock(dev);
1447 obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
1448 S_IFLNK | S_IRWXUGO, uid, gid, symname);
1449 yaffs_gross_unlock(dev);
1452 struct inode *inode;
1454 inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
1455 d_instantiate(dentry, inode);
1456 update_dir_time(dir);
1457 T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
1460 T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
1466 static int yaffs_sync_object(struct file *file, int datasync)
1469 struct yaffs_obj *obj;
1470 struct yaffs_dev *dev;
1471 struct dentry *dentry = file->f_path.dentry;
1473 obj = yaffs_dentry_to_obj(dentry);
1477 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n")));
1478 yaffs_gross_lock(dev);
1479 yaffs_flush_file(obj, 1, datasync);
1480 yaffs_gross_unlock(dev);
1485 * The VFS layer already does all the dentry stuff for rename.
1487 * NB: POSIX says you can rename an object over an old object of the same name
1489 static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
1490 struct inode *new_dir, struct dentry *new_dentry)
1492 struct yaffs_dev *dev;
1493 int ret_val = YAFFS_FAIL;
1494 struct yaffs_obj *target;
1496 T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
1497 dev = yaffs_inode_to_obj(old_dir)->my_dev;
1499 yaffs_gross_lock(dev);
1501 /* Check if the target is an existing directory that is not empty. */
1502 target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
1503 new_dentry->d_name.name);
1505 if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
1506 !list_empty(&target->variant.dir_variant.children)) {
1508 T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
1510 ret_val = YAFFS_FAIL;
1512 /* Now does unlinking internally using shadowing mechanism */
1513 T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n")));
1515 ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
1516 old_dentry->d_name.name,
1517 yaffs_inode_to_obj(new_dir),
1518 new_dentry->d_name.name);
1520 yaffs_gross_unlock(dev);
1522 if (ret_val == YAFFS_OK) {
1524 new_dentry->d_inode->i_nlink--;
1525 mark_inode_dirty(new_dentry->d_inode);
1528 update_dir_time(old_dir);
1529 if (old_dir != new_dir)
1530 update_dir_time(new_dir);
1537 static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
1539 struct inode *inode = dentry->d_inode;
1541 struct yaffs_dev *dev;
1544 (TSTR("yaffs_setattr of object %d\n"),
1545 yaffs_inode_to_obj(inode)->obj_id));
1547 /* Fail if a requested resize >= 2GB */
1548 if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
1552 error = inode_change_ok(inode, attr);
1556 error = yaffs_vfs_setattr(inode, attr);
1557 T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n")));
1558 if (attr->ia_valid & ATTR_SIZE) {
1559 yaffs_vfs_setsize(inode, attr->ia_size);
1560 inode->i_blocks = (inode->i_size + 511) >> 9;
1563 dev = yaffs_inode_to_obj(inode)->my_dev;
1564 if (attr->ia_valid & ATTR_SIZE) {
1565 T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"),
1566 (int)(attr->ia_size),
1567 (int)(attr->ia_size)));
1569 yaffs_gross_lock(dev);
1570 result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
1571 if (result == YAFFS_OK) {
1576 yaffs_gross_unlock(dev);
1580 T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error));
1585 #ifdef CONFIG_YAFFS_XATTR
1586 int yaffs_setxattr(struct dentry *dentry, const char *name,
1587 const void *value, size_t size, int flags)
1589 struct inode *inode = dentry->d_inode;
1591 struct yaffs_dev *dev;
1592 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1594 T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), obj->obj_id));
1599 yaffs_gross_lock(dev);
1600 result = yaffs_set_xattrib(obj, name, value, size, flags);
1601 if (result == YAFFS_OK)
1603 else if (result < 0)
1605 yaffs_gross_unlock(dev);
1608 T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), error));
1613 ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, void *buff,
1616 struct inode *inode = dentry->d_inode;
1618 struct yaffs_dev *dev;
1619 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1622 (TSTR("yaffs_getxattr \"%s\" from object %d\n"), name, obj->obj_id));
1626 yaffs_gross_lock(dev);
1627 error = yaffs_get_xattrib(obj, name, buff, size);
1628 yaffs_gross_unlock(dev);
1631 T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), error));
1636 int yaffs_removexattr(struct dentry *dentry, const char *name)
1638 struct inode *inode = dentry->d_inode;
1640 struct yaffs_dev *dev;
1641 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1644 (TSTR("yaffs_removexattr of object %d\n"), obj->obj_id));
1649 yaffs_gross_lock(dev);
1650 result = yaffs_remove_xattrib(obj, name);
1651 if (result == YAFFS_OK)
1653 else if (result < 0)
1655 yaffs_gross_unlock(dev);
1659 (TSTR("yaffs_removexattr done returning %d\n"), error));
1664 ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
1666 struct inode *inode = dentry->d_inode;
1668 struct yaffs_dev *dev;
1669 struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
1672 (TSTR("yaffs_listxattr of object %d\n"), obj->obj_id));
1676 yaffs_gross_lock(dev);
1677 error = yaffs_list_xattrib(obj, buff, size);
1678 yaffs_gross_unlock(dev);
1681 T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error));
1688 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
1690 struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
1691 struct super_block *sb = dentry->d_sb;
1693 T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
1695 yaffs_gross_lock(dev);
1697 buf->f_type = YAFFS_MAGIC;
1698 buf->f_bsize = sb->s_blocksize;
1699 buf->f_namelen = 255;
1701 if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
1702 /* Do this if chunk size is not a power of 2 */
1704 uint64_t bytes_in_dev;
1705 uint64_t bytes_free;
1709 ((dev->param.end_block - dev->param.start_block +
1710 1))) * ((uint64_t) (dev->param.chunks_per_block *
1711 dev->data_bytes_per_chunk));
1713 do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
1714 buf->f_blocks = bytes_in_dev;
1716 bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
1717 ((uint64_t) (dev->data_bytes_per_chunk));
1719 do_div(bytes_free, sb->s_blocksize);
1721 buf->f_bfree = bytes_free;
1723 } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
1726 (dev->param.end_block - dev->param.start_block + 1) *
1727 dev->param.chunks_per_block /
1728 (sb->s_blocksize / dev->data_bytes_per_chunk);
1730 yaffs_get_n_free_chunks(dev) /
1731 (sb->s_blocksize / dev->data_bytes_per_chunk);
1734 (dev->param.end_block - dev->param.start_block + 1) *
1735 dev->param.chunks_per_block *
1736 (dev->data_bytes_per_chunk / sb->s_blocksize);
1739 yaffs_get_n_free_chunks(dev) *
1740 (dev->data_bytes_per_chunk / sb->s_blocksize);
1745 buf->f_bavail = buf->f_bfree;
1747 yaffs_gross_unlock(dev);
1751 static void yaffs_flush_inodes(struct super_block *sb)
1754 struct yaffs_obj *obj;
1756 list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
1757 obj = yaffs_inode_to_obj(iptr);
1759 T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
1761 yaffs_flush_file(obj, 1, 0);
1766 static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
1768 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1772 yaffs_flush_inodes(sb);
1773 yaffs_update_dirty_dirs(dev);
1774 yaffs_flush_whole_cache(dev);
1776 yaffs_checkpoint_save(dev);
1779 static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
1781 unsigned erased_chunks =
1782 dev->n_erased_blocks * dev->param.chunks_per_block;
1783 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1784 unsigned scattered = 0; /* Free chunks not in an erased block */
1786 if (erased_chunks < dev->n_free_chunks)
1787 scattered = (dev->n_free_chunks - erased_chunks);
1789 if (!context->bg_running)
1791 else if (scattered < (dev->param.chunks_per_block * 2))
1793 else if (erased_chunks > dev->n_free_chunks / 2)
1795 else if (erased_chunks > dev->n_free_chunks / 4)
1801 static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
1804 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1805 unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
1806 unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
1809 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1810 (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
1812 sb->s_dirt ? "dirty" : "clean",
1813 request_checkpoint ? "checkpoint requested" : "no checkpoint",
1814 oneshot_checkpoint ? " one-shot" : ""));
1816 yaffs_gross_lock(dev);
1817 do_checkpoint = ((request_checkpoint && !gc_urgent) ||
1818 oneshot_checkpoint) && !dev->is_checkpointed;
1820 if (sb->s_dirt || do_checkpoint) {
1821 yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
1823 if (oneshot_checkpoint)
1824 yaffs_auto_checkpoint &= ~4;
1826 yaffs_gross_unlock(dev);
1832 * yaffs background thread functions .
1833 * yaffs_bg_thread_fn() the thread function
1834 * yaffs_bg_start() launches the background thread.
1835 * yaffs_bg_stop() cleans up the background thread.
1838 * The thread should only run after the yaffs is initialised
1839 * The thread should be stopped before yaffs is unmounted.
1840 * The thread should not do any writing while the fs is in read only.
1843 void yaffs_background_waker(unsigned long data)
1845 wake_up_process((struct task_struct *)data);
1848 static int yaffs_bg_thread_fn(void *data)
1850 struct yaffs_dev *dev = (struct yaffs_dev *)data;
1851 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1852 unsigned long now = jiffies;
1853 unsigned long next_dir_update = now;
1854 unsigned long next_gc = now;
1855 unsigned long expires;
1856 unsigned int urgency;
1859 struct timer_list timer;
1861 T(YAFFS_TRACE_BACKGROUND,
1862 (TSTR("yaffs_background starting for dev %p\n"), (void *)dev));
1865 while (context->bg_running) {
1866 T(YAFFS_TRACE_BACKGROUND, (TSTR("yaffs_background\n")));
1868 if (kthread_should_stop())
1871 if (try_to_freeze())
1874 yaffs_gross_lock(dev);
1878 if (time_after(now, next_dir_update) && yaffs_bg_enable) {
1879 yaffs_update_dirty_dirs(dev);
1880 next_dir_update = now + HZ;
1883 if (time_after(now, next_gc) && yaffs_bg_enable) {
1884 if (!dev->is_checkpointed) {
1885 urgency = yaffs_bg_gc_urgency(dev);
1886 gc_result = yaffs_bg_gc(dev, urgency);
1888 next_gc = now + HZ / 20 + 1;
1889 else if (urgency > 0)
1890 next_gc = now + HZ / 10 + 1;
1892 next_gc = now + HZ * 2;
1895 * gc not running so set to next_dir_update
1896 * to cut down on wake ups
1898 next_gc = next_dir_update;
1901 yaffs_gross_unlock(dev);
1902 expires = next_dir_update;
1903 if (time_before(next_gc, expires))
1905 if (time_before(expires, now))
1908 Y_INIT_TIMER(&timer);
1909 timer.expires = expires + 1;
1910 timer.data = (unsigned long)current;
1911 timer.function = yaffs_background_waker;
1913 set_current_state(TASK_INTERRUPTIBLE);
1916 del_timer_sync(&timer);
1922 static int yaffs_bg_start(struct yaffs_dev *dev)
1925 struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
1930 context->bg_running = 1;
1932 context->bg_thread = kthread_run(yaffs_bg_thread_fn,
1933 (void *)dev, "yaffs-bg-%d",
1936 if (IS_ERR(context->bg_thread)) {
1937 retval = PTR_ERR(context->bg_thread);
1938 context->bg_thread = NULL;
1939 context->bg_running = 0;
1944 static void yaffs_bg_stop(struct yaffs_dev *dev)
1946 struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
1948 ctxt->bg_running = 0;
1950 if (ctxt->bg_thread) {
1951 kthread_stop(ctxt->bg_thread);
1952 ctxt->bg_thread = NULL;
1956 static void yaffs_write_super(struct super_block *sb)
1958 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
1960 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
1961 (TSTR("yaffs_write_super%s\n"),
1962 request_checkpoint ? " checkpt" : ""));
1964 yaffs_do_sync_fs(sb, request_checkpoint);
1968 static int yaffs_sync_fs(struct super_block *sb, int wait)
1970 unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
1972 T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
1973 (TSTR("yaffs_sync_fs%s\n"), request_checkpoint ? " checkpt" : ""));
1975 yaffs_do_sync_fs(sb, request_checkpoint);
1980 static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
1982 struct inode *inode;
1983 struct yaffs_obj *obj;
1984 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
1986 T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), ino));
1988 inode = iget_locked(sb, ino);
1990 return ERR_PTR(-ENOMEM);
1991 if (!(inode->i_state & I_NEW))
1994 /* NB This is called as a side effect of other functions, but
1995 * we had to release the lock to prevent deadlocks, so
1996 * need to lock again.
1999 yaffs_gross_lock(dev);
2001 obj = yaffs_find_by_number(dev, inode->i_ino);
2003 yaffs_fill_inode_from_obj(inode, obj);
2005 yaffs_gross_unlock(dev);
2007 unlock_new_inode(inode);
2011 static LIST_HEAD(yaffs_context_list);
2012 struct mutex yaffs_context_lock;
2014 static void yaffs_put_super(struct super_block *sb)
2016 struct yaffs_dev *dev = yaffs_super_to_dev(sb);
2018 T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
2020 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2021 (TSTR("Shutting down yaffs background thread\n")));
2023 T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
2024 (TSTR("yaffs background thread shut down\n")));
2026 yaffs_gross_lock(dev);
2028 yaffs_flush_super(sb, 1);
2030 if (yaffs_dev_to_lc(dev)->put_super_fn)
2031 yaffs_dev_to_lc(dev)->put_super_fn(sb);
2033 yaffs_deinitialise(dev);
2035 yaffs_gross_unlock(dev);
2036 mutex_lock(&yaffs_context_lock);
2037 list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
2038 mutex_unlock(&yaffs_context_lock);
2040 if (yaffs_dev_to_lc(dev)->spare_buffer) {
2041 YFREE(yaffs_dev_to_lc(dev)->spare_buffer);
2042 yaffs_dev_to_lc(dev)->spare_buffer = NULL;
2048 static void yaffs_mtd_put_super(struct super_block *sb)
2050 struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
2055 put_mtd_device(mtd);
2058 static void yaffs_touch_super(struct yaffs_dev *dev)
2060 struct super_block *sb = yaffs_dev_to_lc(dev)->super;
2062 T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb));
2067 struct yaffs_options {
2069 int skip_checkpoint_read;
2070 int skip_checkpoint_write;
2073 int tags_ecc_overridden;
2074 int lazy_loading_enabled;
2075 int lazy_loading_overridden;
2076 int empty_lost_and_found;
2077 int empty_lost_and_found_overridden;
2080 #define MAX_OPT_LEN 30
2081 static int yaffs_parse_options(struct yaffs_options *options,
2082 const char *options_str)
2084 char cur_opt[MAX_OPT_LEN + 1];
2088 /* Parse through the options which is a comma seperated list */
2090 while (options_str && *options_str && !error) {
2091 memset(cur_opt, 0, MAX_OPT_LEN + 1);
2094 while (*options_str == ',')
2097 while (*options_str && *options_str != ',') {
2098 if (p < MAX_OPT_LEN) {
2099 cur_opt[p] = *options_str;
2105 if (!strcmp(cur_opt, "inband-tags")) {
2106 options->inband_tags = 1;
2107 } else if (!strcmp(cur_opt, "tags-ecc-off")) {
2108 options->tags_ecc_on = 0;
2109 options->tags_ecc_overridden = 1;
2110 } else if (!strcmp(cur_opt, "tags-ecc-on")) {
2111 options->tags_ecc_on = 1;
2112 options->tags_ecc_overridden = 1;
2113 } else if (!strcmp(cur_opt, "lazy-loading-off")) {
2114 options->lazy_loading_enabled = 0;
2115 options->lazy_loading_overridden = 1;
2116 } else if (!strcmp(cur_opt, "lazy-loading-on")) {
2117 options->lazy_loading_enabled = 1;
2118 options->lazy_loading_overridden = 1;
2119 } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
2120 options->empty_lost_and_found = 0;
2121 options->empty_lost_and_found_overridden = 1;
2122 } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
2123 options->empty_lost_and_found = 1;
2124 options->empty_lost_and_found_overridden = 1;
2125 } else if (!strcmp(cur_opt, "no-cache")) {
2126 options->no_cache = 1;
2127 } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
2128 options->skip_checkpoint_read = 1;
2129 } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
2130 options->skip_checkpoint_write = 1;
2131 } else if (!strcmp(cur_opt, "no-checkpoint")) {
2132 options->skip_checkpoint_read = 1;
2133 options->skip_checkpoint_write = 1;
2135 printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
2144 static struct super_block *yaffs_internal_read_super(int yaffs_version,
2145 struct super_block *sb,
2146 void *data, int silent)
2149 struct inode *inode = NULL;
2150 struct dentry *root;
2151 struct yaffs_dev *dev = 0;
2152 char devname_buf[BDEVNAME_SIZE + 1];
2153 struct mtd_info *mtd;
2155 char *data_str = (char *)data;
2156 struct yaffs_linux_context *context = NULL;
2157 struct yaffs_param *param;
2161 struct yaffs_options options;
2165 struct yaffs_linux_context *context_iterator;
2166 struct list_head *l;
2168 sb->s_magic = YAFFS_MAGIC;
2169 sb->s_op = &yaffs_super_ops;
2170 sb->s_flags |= MS_NOATIME;
2172 read_only = ((sb->s_flags & MS_RDONLY) != 0);
2174 sb->s_export_op = &yaffs_export_ops;
2177 printk(KERN_INFO "yaffs: sb is NULL\n");
2178 else if (!sb->s_dev)
2179 printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
2180 else if (!yaffs_devname(sb, devname_buf))
2181 printk(KERN_INFO "yaffs: devname is NULL\n");
2183 printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
2185 yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
2190 printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
2192 memset(&options, 0, sizeof(options));
2194 if (yaffs_parse_options(&options, data_str)) {
2195 /* Option parsing failed */
2199 sb->s_blocksize = PAGE_CACHE_SIZE;
2200 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
2203 (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version));
2205 (TSTR("yaffs_read_super: block size %d\n"), (int)(sb->s_blocksize)));
2207 T(YAFFS_TRACE_ALWAYS,
2208 (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
2209 MAJOR(sb->s_dev), MINOR(sb->s_dev), yaffs_devname(sb, devname_buf)));
2211 /* Check it's an mtd device..... */
2212 if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
2213 return NULL; /* This isn't an mtd device */
2215 /* Get the device */
2216 mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
2218 T(YAFFS_TRACE_ALWAYS,
2219 (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
2223 /* Check it's NAND */
2224 if (mtd->type != MTD_NANDFLASH) {
2225 T(YAFFS_TRACE_ALWAYS,
2226 (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
2231 T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
2232 T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
2233 T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
2234 T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
2235 T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
2236 T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
2237 T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
2238 T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
2239 T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
2240 T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
2241 T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
2243 #ifdef CONFIG_YAFFS_AUTO_YAFFS2
2245 if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
2246 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs2\n")));
2250 /* Added NCB 26/5/2006 for completeness */
2251 if (yaffs_version == 2 && !options.inband_tags
2252 && WRITE_SIZE(mtd) == 512) {
2253 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs1\n")));
2258 if (yaffs_version == 2) {
2259 /* Check for version 2 style functions */
2261 !mtd->block_isbad ||
2262 !mtd->block_markbad ||
2264 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2265 T(YAFFS_TRACE_ALWAYS,
2266 (TSTR("yaffs: MTD device does not support required "
2271 if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
2272 mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
2273 !options.inband_tags) {
2274 T(YAFFS_TRACE_ALWAYS,
2275 (TSTR("yaffs: MTD device does not have the "
2276 "right page sizes\n")));
2280 /* Check for V1 style functions */
2283 !mtd->write || !mtd->read_oob || !mtd->write_oob) {
2284 T(YAFFS_TRACE_ALWAYS,
2285 (TSTR("yaffs: MTD device does not support required "
2290 if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
2291 mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
2292 T(YAFFS_TRACE_ALWAYS,
2293 (TSTR("yaffs: MTD device does not support have the "
2294 "right page sizes\n")));
2299 /* OK, so if we got here, we have an MTD that's NAND and looks
2300 * like it has the right capabilities
2301 * Set the struct yaffs_dev up for mtd
2304 if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
2307 "yaffs: mtd is read only, setting superblock read only");
2308 sb->s_flags |= MS_RDONLY;
2311 dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
2312 context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
2314 if (!dev || !context) {
2324 /* Deep shit could not allocate device structure */
2325 T(YAFFS_TRACE_ALWAYS,
2326 (TSTR("yaffs_read_super: Failed trying to allocate "
2327 "struct yaffs_dev. \n")));
2330 memset(dev, 0, sizeof(struct yaffs_dev));
2331 param = &(dev->param);
2333 memset(context, 0, sizeof(struct yaffs_linux_context));
2334 dev->os_context = context;
2335 INIT_LIST_HEAD(&(context->context_list));
2337 context->super = sb;
2339 dev->read_only = read_only;
2341 sb->s_fs_info = dev;
2343 dev->driver_context = mtd;
2344 param->name = mtd->name;
2346 /* Set up the memory size parameters.... */
2349 YCALCBLOCKS(mtd->size,
2350 (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
2352 param->start_block = 0;
2353 param->end_block = n_blocks - 1;
2354 param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
2355 param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
2356 param->n_reserved_blocks = 5;
2357 param->n_caches = (options.no_cache) ? 0 : 10;
2358 param->inband_tags = options.inband_tags;
2360 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
2361 param->disable_lazy_load = 1;
2363 #ifdef CONFIG_YAFFS_XATTR
2364 param->enable_xattr = 1;
2366 if (options.lazy_loading_overridden)
2367 param->disable_lazy_load = !options.lazy_loading_enabled;
2369 #ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
2370 param->no_tags_ecc = 1;
2373 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
2375 param->defered_dir_update = 1;
2378 if (options.tags_ecc_overridden)
2379 param->no_tags_ecc = !options.tags_ecc_on;
2381 #ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
2382 param->empty_lost_n_found = 1;
2385 #ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
2386 param->refresh_period = 0;
2388 param->refresh_period = 500;
2391 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2392 param->always_check_erased = 1;
2395 if (options.empty_lost_and_found_overridden)
2396 param->empty_lost_n_found = options.empty_lost_and_found;
2398 /* ... and the functions. */
2399 if (yaffs_version == 2) {
2400 param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
2401 param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
2402 param->bad_block_fn = nandmtd2_mark_block_bad;
2403 param->query_block_fn = nandmtd2_query_block;
2404 yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize);
2405 param->is_yaffs2 = 1;
2406 param->total_bytes_per_chunk = mtd->writesize;
2407 param->chunks_per_block = mtd->erasesize / mtd->writesize;
2408 n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
2410 param->start_block = 0;
2411 param->end_block = n_blocks - 1;
2413 /* use the MTD interface in yaffs_mtdif1.c */
2414 param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
2415 param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
2416 param->bad_block_fn = nandmtd1_mark_block_bad;
2417 param->query_block_fn = nandmtd1_query_block;
2418 param->is_yaffs2 = 0;
2420 /* ... and common functions */
2421 param->erase_fn = nandmtd_erase_block;
2422 param->initialise_flash_fn = nandmtd_initialise;
2424 yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
2426 param->sb_dirty_fn = yaffs_touch_super;
2427 param->gc_control = yaffs_gc_control_callback;
2429 yaffs_dev_to_lc(dev)->super = sb;
2431 #ifndef CONFIG_YAFFS_DOES_ECC
2432 param->use_nand_ecc = 1;
2435 param->skip_checkpt_rd = options.skip_checkpoint_read;
2436 param->skip_checkpt_wr = options.skip_checkpoint_write;
2438 mutex_lock(&yaffs_context_lock);
2439 /* Get a mount id */
2441 for (mount_id = 0; !found; mount_id++) {
2443 list_for_each(l, &yaffs_context_list) {
2445 list_entry(l, struct yaffs_linux_context,
2447 if (context_iterator->mount_id == mount_id)
2451 context->mount_id = mount_id;
2453 list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
2454 &yaffs_context_list);
2455 mutex_unlock(&yaffs_context_lock);
2457 /* Directory search handling... */
2458 INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
2459 param->remove_obj_fn = yaffs_remove_obj_callback;
2461 mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
2463 yaffs_gross_lock(dev);
2465 err = yaffs_guts_initialise(dev);
2468 (TSTR("yaffs_read_super: guts initialised %s\n"),
2469 (err == YAFFS_OK) ? "OK" : "FAILED"));
2471 if (err == YAFFS_OK)
2472 yaffs_bg_start(dev);
2474 if (!context->bg_thread)
2475 param->defered_dir_update = 0;
2477 /* Release lock before yaffs_get_inode() */
2478 yaffs_gross_unlock(dev);
2480 /* Create root inode */
2481 if (err == YAFFS_OK)
2482 inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
2487 inode->i_op = &yaffs_dir_inode_operations;
2488 inode->i_fop = &yaffs_dir_operations;
2490 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
2492 root = d_alloc_root(inode);
2494 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
2501 sb->s_dirt = !dev->is_checkpointed;
2502 T(YAFFS_TRACE_ALWAYS,
2503 (TSTR("yaffs_read_super: is_checkpointed %d\n"),
2504 dev->is_checkpointed));
2506 T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
2510 static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
2513 return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
2516 static int yaffs_read_super(struct file_system_type *fs,
2517 int flags, const char *dev_name,
2518 void *data, struct vfsmount *mnt)
2521 return get_sb_bdev(fs, flags, dev_name, data,
2522 yaffs_internal_read_super_mtd, mnt);
2525 static struct file_system_type yaffs_fs_type = {
2526 .owner = THIS_MODULE,
2528 .get_sb = yaffs_read_super,
2529 .kill_sb = kill_block_super,
2530 .fs_flags = FS_REQUIRES_DEV,
2533 #ifdef CONFIG_YAFFS_YAFFS2
2535 static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
2538 return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
2541 static int yaffs2_read_super(struct file_system_type *fs,
2542 int flags, const char *dev_name, void *data,
2543 struct vfsmount *mnt)
2545 return get_sb_bdev(fs, flags, dev_name, data,
2546 yaffs2_internal_read_super_mtd, mnt);
2549 static struct file_system_type yaffs2_fs_type = {
2550 .owner = THIS_MODULE,
2552 .get_sb = yaffs2_read_super,
2553 .kill_sb = kill_block_super,
2554 .fs_flags = FS_REQUIRES_DEV,
2556 #endif /* CONFIG_YAFFS_YAFFS2 */
2558 static struct proc_dir_entry *my_proc_entry;
2559 static struct proc_dir_entry *debug_proc_entry;
2561 static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
2564 sprintf(buf, "start_block........... %d\n", dev->param.start_block);
2566 sprintf(buf, "end_block............. %d\n", dev->param.end_block);
2568 sprintf(buf, "total_bytes_per_chunk. %d\n",
2569 dev->param.total_bytes_per_chunk);
2571 sprintf(buf, "use_nand_ecc.......... %d\n",
2572 dev->param.use_nand_ecc);
2574 sprintf(buf, "no_tags_ecc........... %d\n", dev->param.no_tags_ecc);
2576 sprintf(buf, "is_yaffs2............. %d\n", dev->param.is_yaffs2);
2578 sprintf(buf, "inband_tags........... %d\n", dev->param.inband_tags);
2580 sprintf(buf, "empty_lost_n_found.... %d\n",
2581 dev->param.empty_lost_n_found);
2583 sprintf(buf, "disable_lazy_load..... %d\n",
2584 dev->param.disable_lazy_load);
2586 sprintf(buf, "refresh_period........ %d\n",
2587 dev->param.refresh_period);
2588 buf += sprintf(buf, "n_caches.............. %d\n", dev->param.n_caches);
2590 sprintf(buf, "n_reserved_blocks..... %d\n",
2591 dev->param.n_reserved_blocks);
2593 sprintf(buf, "always_check_erased... %d\n",
2594 dev->param.always_check_erased);
2596 buf += sprintf(buf, "\n");
2601 static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
2604 sprintf(buf, "data_bytes_per_chunk.. %d\n",
2605 dev->data_bytes_per_chunk);
2606 buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
2607 buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
2609 sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
2611 sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
2612 buf += sprintf(buf, "\n");
2613 buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
2614 buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
2615 buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
2616 buf += sprintf(buf, "\n");
2617 buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
2618 buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
2619 buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
2620 buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
2621 buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
2623 sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
2625 sprintf(buf, "oldest_dirty_gc_count. %u\n",
2626 dev->oldest_dirty_gc_count);
2627 buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
2628 buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
2630 sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
2632 sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
2633 buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
2634 buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
2636 sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
2638 sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
2639 dev->n_tags_ecc_unfixed);
2640 buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
2642 sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
2644 sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
2645 buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
2646 buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
2651 static int yaffs_proc_read(char *page,
2653 off_t offset, int count, int *eof, void *data)
2655 struct list_head *item;
2660 /* Get proc_file_read() to step 'offset' by one on each sucessive call.
2661 * We use 'offset' (*ppos) to indicate where we are in dev_list.
2662 * This also assumes the user has posted a read buffer large
2663 * enough to hold the complete output; but that's life in /proc.
2668 /* Print header first */
2670 buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
2672 buf += sprintf(buf, "\n");
2676 mutex_lock(&yaffs_context_lock);
2678 /* Locate and print the Nth entry. Order N-squared but N is small. */
2679 list_for_each(item, &yaffs_context_list) {
2680 struct yaffs_linux_context *dc =
2681 list_entry(item, struct yaffs_linux_context,
2683 struct yaffs_dev *dev = dc->dev;
2685 if (n < (step & ~1)) {
2689 if ((step & 1) == 0) {
2691 sprintf(buf, "\nDevice %d \"%s\"\n", n,
2693 buf = yaffs_dump_dev_part0(buf, dev);
2695 buf = yaffs_dump_dev_part1(buf, dev);
2700 mutex_unlock(&yaffs_context_lock);
2703 return buf - page < count ? buf - page : count;
2706 static int yaffs_stats_proc_read(char *page,
2708 off_t offset, int count, int *eof, void *data)
2710 struct list_head *item;
2714 mutex_lock(&yaffs_context_lock);
2716 /* Locate and print the Nth entry. Order N-squared but N is small. */
2717 list_for_each(item, &yaffs_context_list) {
2718 struct yaffs_linux_context *dc =
2719 list_entry(item, struct yaffs_linux_context, context_list);
2720 struct yaffs_dev *dev = dc->dev;
2725 dev->n_erased_blocks * dev->param.chunks_per_block;
2727 buf += sprintf(buf, "%d, %d, %d, %u, %u, %u, %u\n",
2728 n, dev->n_free_chunks, erased_chunks,
2729 dev->bg_gcs, dev->oldest_dirty_gc_count,
2730 dev->n_obj, dev->n_tnodes);
2732 mutex_unlock(&yaffs_context_lock);
2734 return buf - page < count ? buf - page : count;
2738 * Set the verbosity of the warnings and error messages.
2740 * Note that the names can only be a..z or _ with the current code.
2745 unsigned mask_bitfield;
2747 {"allocate", YAFFS_TRACE_ALLOCATE},
2748 {"always", YAFFS_TRACE_ALWAYS},
2749 {"background", YAFFS_TRACE_BACKGROUND},
2750 {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
2751 {"buffers", YAFFS_TRACE_BUFFERS},
2752 {"bug", YAFFS_TRACE_BUG},
2753 {"checkpt", YAFFS_TRACE_CHECKPOINT},
2754 {"deletion", YAFFS_TRACE_DELETION},
2755 {"erase", YAFFS_TRACE_ERASE},
2756 {"error", YAFFS_TRACE_ERROR},
2757 {"gc_detail", YAFFS_TRACE_GC_DETAIL},
2758 {"gc", YAFFS_TRACE_GC},
2759 {"lock", YAFFS_TRACE_LOCK},
2760 {"mtd", YAFFS_TRACE_MTD},
2761 {"nandaccess", YAFFS_TRACE_NANDACCESS},
2762 {"os", YAFFS_TRACE_OS},
2763 {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
2764 {"scan", YAFFS_TRACE_SCAN},
2765 {"mount", YAFFS_TRACE_MOUNT},
2766 {"tracing", YAFFS_TRACE_TRACING},
2767 {"sync", YAFFS_TRACE_SYNC},
2768 {"write", YAFFS_TRACE_WRITE},
2769 {"verify", YAFFS_TRACE_VERIFY},
2770 {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
2771 {"verify_full", YAFFS_TRACE_VERIFY_FULL},
2772 {"verify_all", YAFFS_TRACE_VERIFY_ALL},
2773 {"all", 0xffffffff},
2778 #define MAX_MASK_NAME_LENGTH 40
2779 static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
2780 unsigned long count, void *data)
2782 unsigned rg = 0, mask_bitfield;
2786 char substring[MAX_MASK_NAME_LENGTH + 1];
2792 rg = yaffs_trace_mask;
2794 while (!done && (pos < count)) {
2796 while ((pos < count) && isspace(buf[pos]))
2813 mask_bitfield = simple_strtoul(buf + pos, &end, 0);
2815 if (end > buf + pos) {
2816 mask_name = "numeral";
2817 len = end - (buf + pos);
2821 for (x = buf + pos, i = 0;
2822 (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
2823 i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
2825 substring[i] = '\0';
2827 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2828 if (strcmp(substring, mask_flags[i].mask_name)
2830 mask_name = mask_flags[i].mask_name;
2832 mask_flags[i].mask_bitfield;
2839 if (mask_name != NULL) {
2843 rg &= ~mask_bitfield;
2846 rg |= mask_bitfield;
2852 rg |= mask_bitfield;
2858 yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
2860 printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
2862 if (rg & YAFFS_TRACE_ALWAYS) {
2863 for (i = 0; mask_flags[i].mask_name != NULL; i++) {
2865 flag = ((rg & mask_flags[i].mask_bitfield) ==
2866 mask_flags[i].mask_bitfield) ? '+' : '-';
2867 printk(KERN_DEBUG "%c%s\n", flag,
2868 mask_flags[i].mask_name);
2875 static int yaffs_proc_write(struct file *file, const char *buf,
2876 unsigned long count, void *data)
2878 return yaffs_proc_write_trace_options(file, buf, count, data);
2881 /* Stuff to handle installation of file systems */
2882 struct file_system_to_install {
2883 struct file_system_type *fst;
2887 static struct file_system_to_install fs_to_install[] = {
2888 {&yaffs_fs_type, 0},
2889 {&yaffs2_fs_type, 0},
2893 static int __init init_yaffs_fs(void)
2896 struct file_system_to_install *fsinst;
2898 T(YAFFS_TRACE_ALWAYS,
2899 (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
2901 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
2902 T(YAFFS_TRACE_ALWAYS,
2904 (" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
2907 mutex_init(&yaffs_context_lock);
2909 /* Install the proc_fs entries */
2910 my_proc_entry = create_proc_entry("yaffs",
2911 S_IRUGO | S_IFREG, YPROC_ROOT);
2913 if (my_proc_entry) {
2914 my_proc_entry->write_proc = yaffs_proc_write;
2915 my_proc_entry->read_proc = yaffs_proc_read;
2916 my_proc_entry->data = NULL;
2921 debug_proc_entry = create_proc_entry("yaffs_stats",
2922 S_IRUGO | S_IFREG, YPROC_ROOT);
2924 if (debug_proc_entry) {
2925 debug_proc_entry->write_proc = NULL;
2926 debug_proc_entry->read_proc = yaffs_stats_proc_read;
2927 debug_proc_entry->data = NULL;
2932 /* Now add the file system entries */
2934 fsinst = fs_to_install;
2936 while (fsinst->fst && !error) {
2937 error = register_filesystem(fsinst->fst);
2939 fsinst->installed = 1;
2943 /* Any errors? uninstall */
2945 fsinst = fs_to_install;
2947 while (fsinst->fst) {
2948 if (fsinst->installed) {
2949 unregister_filesystem(fsinst->fst);
2950 fsinst->installed = 0;
2959 static void __exit exit_yaffs_fs(void)
2962 struct file_system_to_install *fsinst;
2964 T(YAFFS_TRACE_ALWAYS,
2965 (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
2967 remove_proc_entry("yaffs", YPROC_ROOT);
2968 remove_proc_entry("yaffs_stats", YPROC_ROOT);
2970 fsinst = fs_to_install;
2972 while (fsinst->fst) {
2973 if (fsinst->installed) {
2974 unregister_filesystem(fsinst->fst);
2975 fsinst->installed = 0;
2981 module_init(init_yaffs_fs)
2982 module_exit(exit_yaffs_fs)
2984 MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
2985 MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
2986 MODULE_LICENSE("GPL");