2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001-2003 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
10 * $Id: fs.c,v 1.66 2005/09/27 13:17:29 dedekind Exp $
14 #include <linux/config.h>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
18 #include <linux/list.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/pagemap.h>
21 #include <linux/slab.h>
22 #include <linux/vmalloc.h>
23 #include <linux/vfs.h>
24 #include <linux/crc32.h>
27 static int jffs2_flash_setup(struct jffs2_sb_info *c);
29 static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
31 struct jffs2_full_dnode *old_metadata, *new_metadata;
32 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
33 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
34 struct jffs2_raw_inode *ri;
36 unsigned char *mdata = NULL;
39 uint32_t phys_ofs, alloclen;
41 D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino));
42 ret = inode_change_ok(inode, iattr);
46 /* Special cases - we don't want more than one data node
47 for these types on the medium at any time. So setattr
48 must read the original data associated with the node
49 (i.e. the device numbers or the target name) and write
50 it out again with the appropriate data attached */
51 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
52 /* For these, we don't actually need to read the old node */
53 dev = old_encode_dev(inode->i_rdev);
55 mdatalen = sizeof(dev);
56 D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
57 } else if (S_ISLNK(inode->i_mode)) {
58 mdatalen = f->metadata->size;
59 mdata = kmalloc(f->metadata->size, GFP_USER);
62 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, &phys_ofs, &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, phys_ofs, 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)
182 return jffs2_do_setattr(dentry->d_inode, iattr);
185 int jffs2_statfs(struct super_block *sb, struct kstatfs *buf)
187 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
190 buf->f_type = JFFS2_SUPER_MAGIC;
191 buf->f_bsize = 1 << PAGE_SHIFT;
192 buf->f_blocks = c->flash_size >> PAGE_SHIFT;
195 buf->f_namelen = JFFS2_MAX_NAME_LEN;
197 spin_lock(&c->erase_completion_lock);
198 avail = c->dirty_size + c->free_size;
199 if (avail > c->sector_size * c->resv_blocks_write)
200 avail -= c->sector_size * c->resv_blocks_write;
203 spin_unlock(&c->erase_completion_lock);
205 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
211 void jffs2_clear_inode (struct inode *inode)
213 /* We can forget about this inode for now - drop all
214 * the nodelists associated with it, etc.
216 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
217 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
219 D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
221 jffs2_do_clear_inode(c, f);
224 void jffs2_read_inode (struct inode *inode)
226 struct jffs2_inode_info *f;
227 struct jffs2_sb_info *c;
228 struct jffs2_raw_inode latest_node;
231 D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
233 f = JFFS2_INODE_INFO(inode);
234 c = JFFS2_SB_INFO(inode->i_sb);
236 jffs2_init_inode_info(f);
239 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
242 make_bad_inode(inode);
246 inode->i_mode = jemode_to_cpu(latest_node.mode);
247 inode->i_uid = je16_to_cpu(latest_node.uid);
248 inode->i_gid = je16_to_cpu(latest_node.gid);
249 inode->i_size = je32_to_cpu(latest_node.isize);
250 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
251 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
252 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
254 inode->i_nlink = f->inocache->nlink;
256 inode->i_blksize = PAGE_SIZE;
257 inode->i_blocks = (inode->i_size + 511) >> 9;
259 switch (inode->i_mode & S_IFMT) {
263 inode->i_op = &jffs2_symlink_inode_operations;
268 struct jffs2_full_dirent *fd;
270 for (fd=f->dents; fd; fd = fd->next) {
271 if (fd->type == DT_DIR && fd->ino)
276 /* Root dir gets i_nlink 3 for some reason */
277 if (inode->i_ino == 1)
280 inode->i_op = &jffs2_dir_inode_operations;
281 inode->i_fop = &jffs2_dir_operations;
285 inode->i_op = &jffs2_file_inode_operations;
286 inode->i_fop = &jffs2_file_operations;
287 inode->i_mapping->a_ops = &jffs2_file_address_operations;
288 inode->i_mapping->nrpages = 0;
293 /* Read the device numbers from the media */
294 D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
295 if (jffs2_read_dnode(c, f, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) {
297 printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
299 jffs2_do_clear_inode(c, f);
300 make_bad_inode(inode);
306 inode->i_op = &jffs2_file_inode_operations;
307 init_special_inode(inode, inode->i_mode,
308 old_decode_dev((je16_to_cpu(rdev))));
312 printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino);
317 D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
320 void jffs2_dirty_inode(struct inode *inode)
324 if (!(inode->i_state & I_DIRTY_DATASYNC)) {
325 D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino));
329 D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino));
331 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
332 iattr.ia_mode = inode->i_mode;
333 iattr.ia_uid = inode->i_uid;
334 iattr.ia_gid = inode->i_gid;
335 iattr.ia_atime = inode->i_atime;
336 iattr.ia_mtime = inode->i_mtime;
337 iattr.ia_ctime = inode->i_ctime;
339 jffs2_do_setattr(inode, &iattr);
342 int jffs2_remount_fs (struct super_block *sb, int *flags, char *data)
344 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
346 if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
349 /* We stop if it was running, then restart if it needs to.
350 This also catches the case where it was stopped and this
351 is just a remount to restart it.
352 Flush the writebuffer, if neccecary, else we loose it */
353 if (!(sb->s_flags & MS_RDONLY)) {
354 jffs2_stop_garbage_collect_thread(c);
356 jffs2_flush_wbuf_pad(c);
360 if (!(*flags & MS_RDONLY))
361 jffs2_start_garbage_collect_thread(c);
363 *flags |= MS_NOATIME;
368 void jffs2_write_super (struct super_block *sb)
370 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
373 if (sb->s_flags & MS_RDONLY)
376 D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
377 jffs2_garbage_collect_trigger(c);
378 jffs2_erase_pending_blocks(c, 0);
379 jffs2_flush_wbuf_gc(c, 0);
383 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
384 fill in the raw_inode while you're at it. */
385 struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri)
388 struct super_block *sb = dir_i->i_sb;
389 struct jffs2_sb_info *c;
390 struct jffs2_inode_info *f;
393 D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode));
395 c = JFFS2_SB_INFO(sb);
397 inode = new_inode(sb);
400 return ERR_PTR(-ENOMEM);
402 f = JFFS2_INODE_INFO(inode);
403 jffs2_init_inode_info(f);
406 memset(ri, 0, sizeof(*ri));
407 /* Set OS-specific defaults for new inodes */
408 ri->uid = cpu_to_je16(current->fsuid);
410 if (dir_i->i_mode & S_ISGID) {
411 ri->gid = cpu_to_je16(dir_i->i_gid);
415 ri->gid = cpu_to_je16(current->fsgid);
417 ri->mode = cpu_to_jemode(mode);
418 ret = jffs2_do_new_inode (c, f, mode, ri);
420 make_bad_inode(inode);
425 inode->i_ino = je32_to_cpu(ri->ino);
426 inode->i_mode = jemode_to_cpu(ri->mode);
427 inode->i_gid = je16_to_cpu(ri->gid);
428 inode->i_uid = je16_to_cpu(ri->uid);
429 inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
430 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
432 inode->i_blksize = PAGE_SIZE;
436 insert_inode_hash(inode);
442 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
444 struct jffs2_sb_info *c;
445 struct inode *root_i;
449 c = JFFS2_SB_INFO(sb);
451 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER
452 if (c->mtd->type == MTD_NANDFLASH) {
453 printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n");
456 if (c->mtd->type == MTD_DATAFLASH) {
457 printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n");
462 c->flash_size = c->mtd->size;
463 c->sector_size = c->mtd->erasesize;
464 blocks = c->flash_size / c->sector_size;
467 * Size alignment check
469 if ((c->sector_size * blocks) != c->flash_size) {
470 c->flash_size = c->sector_size * blocks;
471 printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n",
472 c->flash_size / 1024);
475 if (c->flash_size < 5*c->sector_size) {
476 printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size);
480 c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
482 /* NAND (or other bizarre) flash... do setup accordingly */
483 ret = jffs2_flash_setup(c);
487 c->inocache_list = kmalloc(INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
488 if (!c->inocache_list) {
492 memset(c->inocache_list, 0, INOCACHE_HASHSIZE * sizeof(struct jffs2_inode_cache *));
494 if ((ret = jffs2_do_mount_fs(c)))
499 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
500 root_i = iget(sb, 1);
501 if (is_bad_inode(root_i)) {
502 D1(printk(KERN_WARNING "get root inode failed\n"));
506 D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
507 sb->s_root = d_alloc_root(root_i);
511 sb->s_maxbytes = 0xFFFFFFFF;
512 sb->s_blocksize = PAGE_CACHE_SIZE;
513 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
514 sb->s_magic = JFFS2_SUPER_MAGIC;
515 if (!(sb->s_flags & MS_RDONLY))
516 jffs2_start_garbage_collect_thread(c);
521 jffs2_free_ino_caches(c);
522 jffs2_free_raw_node_refs(c);
523 if (jffs2_blocks_use_vmalloc(c))
528 kfree(c->inocache_list);
530 jffs2_flash_cleanup(c);
535 void jffs2_gc_release_inode(struct jffs2_sb_info *c,
536 struct jffs2_inode_info *f)
538 iput(OFNI_EDONI_2SFFJ(f));
541 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
545 struct jffs2_inode_cache *ic;
547 /* The inode has zero nlink but its nodes weren't yet marked
548 obsolete. This has to be because we're still waiting for
549 the final (close() and) iput() to happen.
551 There's a possibility that the final iput() could have
552 happened while we were contemplating. In order to ensure
553 that we don't cause a new read_inode() (which would fail)
554 for the inode in question, we use ilookup() in this case
557 The nlink can't _become_ zero at this point because we're
558 holding the alloc_sem, and jffs2_do_unlink() would also
559 need that while decrementing nlink on any inode.
561 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
563 D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n",
566 spin_lock(&c->inocache_lock);
567 ic = jffs2_get_ino_cache(c, inum);
569 D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum));
570 spin_unlock(&c->inocache_lock);
573 if (ic->state != INO_STATE_CHECKEDABSENT) {
574 /* Wait for progress. Don't just loop */
575 D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n",
576 ic->ino, ic->state));
577 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
579 spin_unlock(&c->inocache_lock);
585 /* Inode has links to it still; they're not going away because
586 jffs2_do_unlink() would need the alloc_sem and we have it.
587 Just iget() it, and if read_inode() is necessary that's OK.
589 inode = iget(OFNI_BS_2SFFJ(c), inum);
591 return ERR_PTR(-ENOMEM);
593 if (is_bad_inode(inode)) {
594 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n",
596 /* NB. This will happen again. We need to do something appropriate here. */
598 return ERR_PTR(-EIO);
601 return JFFS2_INODE_INFO(inode);
604 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
605 struct jffs2_inode_info *f,
606 unsigned long offset,
609 struct inode *inode = OFNI_EDONI_2SFFJ(f);
612 pg = read_cache_page(inode->i_mapping, offset >> PAGE_CACHE_SHIFT,
613 (void *)jffs2_do_readpage_unlock, inode);
617 *priv = (unsigned long)pg;
621 void jffs2_gc_release_page(struct jffs2_sb_info *c,
625 struct page *pg = (void *)*priv;
628 page_cache_release(pg);
631 static int jffs2_flash_setup(struct jffs2_sb_info *c) {
634 if (jffs2_cleanmarker_oob(c)) {
635 /* NAND flash... do setup accordingly */
636 ret = jffs2_nand_flash_setup(c);
641 /* add setups for other bizarre flashes here... */
642 if (jffs2_nor_ecc(c)) {
643 ret = jffs2_nor_ecc_flash_setup(c);
649 if (jffs2_dataflash(c)) {
650 ret = jffs2_dataflash_setup(c);
655 /* and Intel "Sibley" flash */
656 if (jffs2_nor_wbuf_flash(c)) {
657 ret = jffs2_nor_wbuf_flash_setup(c);
665 void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
667 if (jffs2_cleanmarker_oob(c)) {
668 jffs2_nand_flash_cleanup(c);
671 /* add cleanups for other bizarre flashes here... */
672 if (jffs2_nor_ecc(c)) {
673 jffs2_nor_ecc_flash_cleanup(c);
677 if (jffs2_dataflash(c)) {
678 jffs2_dataflash_cleanup(c);
681 /* and Intel "Sibley" flash */
682 if (jffs2_nor_wbuf_flash(c)) {
683 jffs2_nor_wbuf_flash_cleanup(c);