2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/list.h>
17 #include <linux/mtd/mtd.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/vfs.h>
22 #include <linux/crc32.h>
25 static int jffs2_flash_setup(struct jffs2_sb_info *c);
27 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
29 struct jffs2_full_dnode *old_metadata, *new_metadata;
30 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
31 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
32 struct jffs2_raw_inode *ri;
33 union jffs2_device_node dev;
34 unsigned char *mdata = NULL;
40 D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
42 /* Special cases - we don't want more than one data node
43 for these types on the medium at any time. So setattr
44 must read the original data associated with the node
45 (i.e. the device numbers or the target name) and write
46 it out again with the appropriate data attached */
47 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
48 /* For these, we don't actually need to read the old node */
49 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
51 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
52 } else if (S_ISLNK(inode->i_mode)) {
54 mdatalen = f->metadata->size;
55 mdata = kmalloc(f->metadata->size, GFP_USER);
60 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
67 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen));
70 ri = jffs2_alloc_raw_inode();
72 if (S_ISLNK(inode->i_mode))
77 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
78 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
80 jffs2_free_raw_inode(ri);
81 if (S_ISLNK(inode->i_mode & S_IFMT))
86 ivalid = iattr->ia_valid;
88 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
89 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
90 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
91 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
93 ri->ino = cpu_to_je32(inode->i_ino);
94 ri->version = cpu_to_je32(++f->highest_version);
96 ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid);
97 ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid);
99 if (ivalid & ATTR_MODE)
100 if (iattr->ia_mode & S_ISGID &&
101 !in_group_p(je16_to_cpu(ri->gid)) && !capable(CAP_FSETID))
102 ri->mode = cpu_to_jemode(iattr->ia_mode & ~S_ISGID);
104 ri->mode = cpu_to_jemode(iattr->ia_mode);
106 ri->mode = cpu_to_jemode(inode->i_mode);
109 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
110 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
111 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
112 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
114 ri->offset = cpu_to_je32(0);
115 ri->csize = ri->dsize = cpu_to_je32(mdatalen);
116 ri->compr = JFFS2_COMPR_NONE;
117 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
118 /* It's an extension. Make it a hole node */
119 ri->compr = JFFS2_COMPR_ZERO;
120 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
121 ri->offset = cpu_to_je32(inode->i_size);
123 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
125 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
127 ri->data_crc = cpu_to_je32(0);
129 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, ALLOC_NORMAL);
130 if (S_ISLNK(inode->i_mode))
133 if (IS_ERR(new_metadata)) {
134 jffs2_complete_reservation(c);
135 jffs2_free_raw_inode(ri);
137 return PTR_ERR(new_metadata);
139 /* It worked. Update the inode */
140 inode->i_atime = ITIME(je32_to_cpu(ri->atime));
141 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
142 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
143 inode->i_mode = jemode_to_cpu(ri->mode);
144 inode->i_uid = je16_to_cpu(ri->uid);
145 inode->i_gid = je16_to_cpu(ri->gid);
148 old_metadata = f->metadata;
150 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
151 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
153 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
154 jffs2_add_full_dnode_to_inode(c, f, new_metadata);
155 inode->i_size = iattr->ia_size;
158 f->metadata = new_metadata;
161 jffs2_mark_node_obsolete(c, old_metadata->raw);
162 jffs2_free_full_dnode(old_metadata);
164 jffs2_free_raw_inode(ri);
167 jffs2_complete_reservation(c);
169 /* We have to do the vmtruncate() without f->sem held, since
170 some pages may be locked and waiting for it in readpage().
171 We are protected from a simultaneous write() extending i_size
172 back past iattr->ia_size, because do_truncate() holds the
173 generic inode semaphore. */
174 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
175 vmtruncate(inode, iattr->ia_size);
180 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
184 rc = inode_change_ok(dentry->d_inode, iattr);
188 rc = jffs2_do_setattr(dentry->d_inode, iattr);
189 if (!rc && (iattr->ia_valid & ATTR_MODE))
190 rc = jffs2_acl_chmod(dentry->d_inode);
195 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
197 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
200 buf->f_type = JFFS2_SUPER_MAGIC;
201 buf->f_bsize = 1 << PAGE_SHIFT;
202 buf->f_blocks = c->flash_size >> PAGE_SHIFT;
205 buf->f_namelen = JFFS2_MAX_NAME_LEN;
207 spin_lock(&c->erase_completion_lock);
208 avail = c->dirty_size + c->free_size;
209 if (avail > c->sector_size * c->resv_blocks_write)
210 avail -= c->sector_size * c->resv_blocks_write;
213 spin_unlock(&c->erase_completion_lock);
215 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
221 void jffs2_clear_inode (struct inode *inode)
223 /* We can forget about this inode for now - drop all
224 * the nodelists associated with it, etc.
226 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
227 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
229 D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
230 jffs2_do_clear_inode(c, f);
233 void jffs2_read_inode (struct inode *inode)
235 struct jffs2_inode_info *f;
236 struct jffs2_sb_info *c;
237 struct jffs2_raw_inode latest_node;
238 union jffs2_device_node jdev;
242 D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
244 f = JFFS2_INODE_INFO(inode);
245 c = JFFS2_SB_INFO(inode->i_sb);
247 jffs2_init_inode_info(f);
250 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
253 make_bad_inode(inode);
257 inode->i_mode = jemode_to_cpu(latest_node.mode);
258 inode->i_uid = je16_to_cpu(latest_node.uid);
259 inode->i_gid = je16_to_cpu(latest_node.gid);
260 inode->i_size = je32_to_cpu(latest_node.isize);
261 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
262 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
263 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
265 inode->i_nlink = f->inocache->nlink;
267 inode->i_blocks = (inode->i_size + 511) >> 9;
269 switch (inode->i_mode & S_IFMT) {
272 inode->i_op = &jffs2_symlink_inode_operations;
277 struct jffs2_full_dirent *fd;
279 for (fd=f->dents; fd; fd = fd->next) {
280 if (fd->type == DT_DIR && fd->ino)
285 /* Root dir gets i_nlink 3 for some reason */
286 if (inode->i_ino == 1)
289 inode->i_op = &jffs2_dir_inode_operations;
290 inode->i_fop = &jffs2_dir_operations;
294 inode->i_op = &jffs2_file_inode_operations;
295 inode->i_fop = &jffs2_file_operations;
296 inode->i_mapping->a_ops = &jffs2_file_address_operations;
297 inode->i_mapping->nrpages = 0;
302 /* Read the device numbers from the media */
303 if (f->metadata->size != sizeof(jdev.old) &&
304 f->metadata->size != sizeof(jdev.new)) {
305 printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
307 jffs2_do_clear_inode(c, f);
308 make_bad_inode(inode);
311 D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
312 if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) {
314 printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
316 jffs2_do_clear_inode(c, f);
317 make_bad_inode(inode);
320 if (f->metadata->size == sizeof(jdev.old))
321 rdev = old_decode_dev(je16_to_cpu(jdev.old));
323 rdev = new_decode_dev(je32_to_cpu(jdev.new));
327 inode->i_op = &jffs2_file_inode_operations;
328 init_special_inode(inode, inode->i_mode, rdev);
332 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino);
337 D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
340 void jffs2_dirty_inode(struct inode *inode)
344 if (!(inode->i_state & I_DIRTY_DATASYNC)) {
345 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino));
349 D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino));
351 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
352 iattr.ia_mode = inode->i_mode;
353 iattr.ia_uid = inode->i_uid;
354 iattr.ia_gid = inode->i_gid;
355 iattr.ia_atime = inode->i_atime;
356 iattr.ia_mtime = inode->i_mtime;
357 iattr.ia_ctime = inode->i_ctime;
359 jffs2_do_setattr(inode, &iattr);
362 int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
364 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
366 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
369 /* We stop if it was running, then restart if it needs to.
370 This also catches the case where it was stopped and this
371 is just a remount to restart it.
372 Flush the writebuffer, if neccecary, else we loose it */
373 if (!(sb->s_flags & MS_RDONLY)) {
374 jffs2_stop_garbage_collect_thread(c);
376 jffs2_flush_wbuf_pad(c);
380 if (!(*flags & MS_RDONLY))
381 jffs2_start_garbage_collect_thread(c);
383 *flags |= MS_NOATIME;
388 void jffs2_write_super (struct super_block *sb)
390 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
393 if (sb->s_flags & MS_RDONLY)
396 D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
397 jffs2_garbage_collect_trigger(c);
398 jffs2_erase_pending_blocks(c, 0);
399 jffs2_flush_wbuf_gc(c, 0);
403 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
404 fill in the raw_inode while you're at it. */
405 struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri,
406 struct posix_acl **acl)
409 struct super_block *sb = dir_i->i_sb;
410 struct jffs2_sb_info *c;
411 struct jffs2_inode_info *f;
414 D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode));
416 c = JFFS2_SB_INFO(sb);
418 inode = new_inode(sb);
421 return ERR_PTR(-ENOMEM);
423 f = JFFS2_INODE_INFO(inode);
424 jffs2_init_inode_info(f);
427 memset(ri, 0, sizeof(*ri));
428 /* Set OS-specific defaults for new inodes */
429 ri->uid = cpu_to_je16(current->fsuid);
431 if (dir_i->i_mode & S_ISGID) {
432 ri->gid = cpu_to_je16(dir_i->i_gid);
436 ri->gid = cpu_to_je16(current->fsgid);
439 /* POSIX ACLs have to be processed now, at least partly.
440 The umask is only applied if there's no default ACL */
441 if (!S_ISLNK(mode)) {
442 *acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
444 make_bad_inode(inode);
446 inode = (void *)*acl;
451 mode &= ~current->fs->umask;
455 ret = jffs2_do_new_inode (c, f, mode, ri);
457 make_bad_inode(inode);
462 inode->i_ino = je32_to_cpu(ri->ino);
463 inode->i_mode = jemode_to_cpu(ri->mode);
464 inode->i_gid = je16_to_cpu(ri->gid);
465 inode->i_uid = je16_to_cpu(ri->uid);
466 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
467 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
472 insert_inode_hash(inode);
478 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
480 struct jffs2_sb_info *c;
481 struct inode *root_i;
485 c = JFFS2_SB_INFO(sb);
487 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER
488 if (c->mtd->type == MTD_NANDFLASH) {
489 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
492 if (c->mtd->type == MTD_DATAFLASH) {
493 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");
498 c->flash_size = c->mtd->size;
499 c->sector_size = c->mtd->erasesize;
500 blocks = c->flash_size / c->sector_size;
503 * Size alignment check
505 if ((c->sector_size * blocks) != c->flash_size) {
506 c->flash_size = c->sector_size * blocks;
507 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n",
508 c->flash_size / 1024);
511 if (c->flash_size < 5*c->sector_size) {
512 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
516 c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
518 /* NAND (or other bizarre) flash... do setup accordingly */
519 ret = jffs2_flash_setup(c);
523 c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
524 if (!c->inocache_list) {
529 jffs2_init_xattr_subsystem(c);
531 if ((ret = jffs2_do_mount_fs(c)))
536 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
537 root_i = iget(sb, 1);
538 if (is_bad_inode(root_i)) {
539 D1(printk(KERN_WARNING "get root inode failed\n"));
543 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
544 sb->s_root = d_alloc_root(root_i);
548 sb->s_maxbytes = 0xFFFFFFFF;
549 sb->s_blocksize = PAGE_CACHE_SIZE;
550 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
551 sb->s_magic = JFFS2_SUPER_MAGIC;
552 if (!(sb->s_flags & MS_RDONLY))
553 jffs2_start_garbage_collect_thread(c);
558 jffs2_free_ino_caches(c);
559 jffs2_free_raw_node_refs(c);
560 if (jffs2_blocks_use_vmalloc(c))
565 jffs2_clear_xattr_subsystem(c);
566 kfree(c->inocache_list);
568 jffs2_flash_cleanup(c);
573 void jffs2_gc_release_inode(struct jffs2_sb_info *c,
574 struct jffs2_inode_info *f)
576 iput(OFNI_EDONI_2SFFJ(f));
579 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
583 struct jffs2_inode_cache *ic;
585 /* The inode has zero nlink but its nodes weren't yet marked
586 obsolete. This has to be because we're still waiting for
587 the final (close() and) iput() to happen.
589 There's a possibility that the final iput() could have
590 happened while we were contemplating. In order to ensure
591 that we don't cause a new read_inode() (which would fail)
592 for the inode in question, we use ilookup() in this case
595 The nlink can't _become_ zero at this point because we're
596 holding the alloc_sem, and jffs2_do_unlink() would also
597 need that while decrementing nlink on any inode.
599 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
601 D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n",
604 spin_lock(&c->inocache_lock);
605 ic = jffs2_get_ino_cache(c, inum);
607 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum));
608 spin_unlock(&c->inocache_lock);
611 if (ic->state != INO_STATE_CHECKEDABSENT) {
612 /* Wait for progress. Don't just loop */
613 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n",
614 ic->ino, ic->state));
615 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
617 spin_unlock(&c->inocache_lock);
623 /* Inode has links to it still; they're not going away because
624 jffs2_do_unlink() would need the alloc_sem and we have it.
625 Just iget() it, and if read_inode() is necessary that's OK.
627 inode = iget(OFNI_BS_2SFFJ(c), inum);
629 return ERR_PTR(-ENOMEM);
631 if (is_bad_inode(inode)) {
632 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n",
634 /* NB. This will happen again. We need to do something appropriate here. */
636 return ERR_PTR(-EIO);
639 return JFFS2_INODE_INFO(inode);
642 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
643 struct jffs2_inode_info *f,
644 unsigned long offset,
647 struct inode *inode = OFNI_EDONI_2SFFJ(f);
650 pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
651 (void *)jffs2_do_readpage_unlock, inode);
655 *priv = (unsigned long)pg;
659 void jffs2_gc_release_page(struct jffs2_sb_info *c,
663 struct page *pg = (void *)*priv;
666 page_cache_release(pg);
669 static int jffs2_flash_setup(struct jffs2_sb_info *c) {
672 if (jffs2_cleanmarker_oob(c)) {
673 /* NAND flash... do setup accordingly */
674 ret = jffs2_nand_flash_setup(c);
680 if (jffs2_dataflash(c)) {
681 ret = jffs2_dataflash_setup(c);
686 /* and Intel "Sibley" flash */
687 if (jffs2_nor_wbuf_flash(c)) {
688 ret = jffs2_nor_wbuf_flash_setup(c);
693 /* and an UBI volume */
694 if (jffs2_ubivol(c)) {
695 ret = jffs2_ubivol_setup(c);
703 void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
705 if (jffs2_cleanmarker_oob(c)) {
706 jffs2_nand_flash_cleanup(c);
710 if (jffs2_dataflash(c)) {
711 jffs2_dataflash_cleanup(c);
714 /* and Intel "Sibley" flash */
715 if (jffs2_nor_wbuf_flash(c)) {
716 jffs2_nor_wbuf_flash_cleanup(c);
719 /* and an UBI volume */
720 if (jffs2_ubivol(c)) {
721 jffs2_ubivol_cleanup(c);