2 * linux/fs/obdfs/namei.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/ext2/namei.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 * Directory entry file type support and forward compatibility hooks
18 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
20 * Changes for use in OBDFS
21 * Copyright (c) 1999, Seagate Technology Inc.
25 #include <asm/uaccess.h>
27 #include <linux/errno.h>
29 #include <linux/ext2_fs.h>
30 #include <linux/fcntl.h>
31 #include <linux/sched.h>
32 #include <linux/stat.h>
33 #include <linux/string.h>
34 #include <linux/locks.h>
35 #include <linux/quotaops.h>
36 #include <linux/iobuf.h>
38 #include <linux/obd_support.h>
39 #include <linux/obdfs.h>
42 * define how far ahead to read directories while searching them.
44 #define NAMEI_RA_CHUNKS 2
45 #define NAMEI_RA_BLOCKS 4
46 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
47 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
50 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
52 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
53 * `de != NULL' is guaranteed by caller.
55 static inline int ext2_match (int len, const char * const name,
56 struct ext2_dir_entry_2 * de)
58 if (len != de->name_len)
62 return !memcmp(name, de->name, len);
68 * finds an entry in the specified directory with the wanted name. It
69 * returns the cache buffer in which the entry was found, and the entry
70 * itself (as a parameter - res_dir). It does NOT read the inode of the
71 * entry - you'll have to do that yourself if you want to.
73 static struct page * obdfs_find_entry (struct inode * dir,
74 const char * const name, int namelen,
75 struct ext2_dir_entry_2 ** res_dir, int lock)
77 struct super_block * sb;
81 CDEBUG(D_INODE, "find entry for %*s\n", namelen, name);
86 if (namelen > EXT2_NAME_LEN)
89 CDEBUG(D_INODE, "dirsize is %Ld\n", dir->i_size);
93 while ( offset < dir->i_size ) {
94 struct ext2_dir_entry_2 * de;
97 page = obdfs_getpage(dir, offset, 0, lock);
100 CDEBUG(D_INODE, "No page, offset %lx\n", offset);
104 de = (struct ext2_dir_entry_2 *) page_address(page);
105 dlimit = (char *)page_address(page) + PAGE_SIZE;
106 while ((char *) de < dlimit) {
107 /* this code is executed quadratically often */
108 /* do minimal checking `by hand' */
110 CDEBUG(D_INODE, "Entry %p len %d, page at %#lx - %#lx , offset %lx\n",
111 de, le16_to_cpu(de->rec_len), page_address(page),
112 page_address(page) + PAGE_SIZE, offset);
114 if ((char *) de + namelen <= dlimit &&
115 ext2_match (namelen, name, de)) {
117 just to be sure, do a full check */
118 if (!obdfs_check_dir_entry("ext2_find_entry",
119 dir, de, page, offset))
125 /* prevent looping on a bad block */
126 de_len = le16_to_cpu(de->rec_len);
128 CDEBUG(D_INODE, "Bad entry: at %p len %d\n",
133 de = (struct ext2_dir_entry_2 *)
134 ((char *) de + de_len);
135 CDEBUG(D_INODE, "Next while %lx\n", offset);
139 page_cache_release(page);
141 CDEBUG(D_INODE, "Next for %lx\n", offset);
145 CDEBUG(D_INODE, "Negative case, page %p, offset %ld\n", page, offset);
149 page_cache_release(page);
155 struct dentry *obdfs_lookup(struct inode * dir, struct dentry *dentry)
157 struct inode * inode;
158 struct ext2_dir_entry_2 * de;
162 if (dentry->d_name.len > EXT2_NAME_LEN)
163 return ERR_PTR(-ENAMETOOLONG);
165 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
168 CDEBUG(D_INODE, "No page - negative entry.\n");
170 CDEBUG(D_INODE, "Danger: PAGE but de.\n");
171 return ERR_PTR(-ENOENT);
174 unsigned long ino = le32_to_cpu(de->inode);
176 page_cache_release(page);
177 inode = iget(dir->i_sb, ino);
180 CDEBUG(D_INODE, "No inode.\n");
182 return ERR_PTR(-EACCES);
185 d_add(dentry, inode);
194 * adds a file entry to the specified directory, using the same
195 * semantics as ext2_find_entry(). It returns NULL if it failed.
197 * NOTE!! The inode part of 'de' is left at 0 - which means you
198 * may not sleep between calling this and putting something into
199 * the entry, as someone else might have used it while you slept.
201 * returns a locked and held page upon success
203 static struct page *obdfs_add_entry (struct inode * dir,
204 const char * name, int namelen,
205 struct ext2_dir_entry_2 ** res_dir,
208 unsigned long offset;
209 unsigned short rec_len;
211 struct ext2_dir_entry_2 * de, * de1;
212 struct super_block * sb;
217 if (!dir || !dir->i_nlink) {
228 * Is this a busy deleted directory? Can't create new files if so
230 if (dir->i_size == 0)
236 page = obdfs_getpage(dir, 0, 0, LOCKED);
241 rec_len = EXT2_DIR_REC_LEN(namelen);
242 CDEBUG(D_INODE, "reclen: %d\n", rec_len);
244 de = (struct ext2_dir_entry_2 *) page_address(page);
247 CDEBUG(D_INODE, "Considering entry at %p, (page at %#lx - %#lx), offset %ld\n",
248 de, page_address(page), page_address(page) + PAGE_SIZE, offset);
249 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
251 page_cache_release(page);
252 page = obdfs_getpage(dir, offset, 1, LOCKED);
257 if (dir->i_size <= offset) {
258 if (dir->i_size == 0) {
264 CDEBUG(D_INODE, "creating next block\n");
266 de = (struct ext2_dir_entry_2 *) page_address(page);
268 de->rec_len = le16_to_cpu(PAGE_SIZE);
269 dir->i_size = offset + PAGE_SIZE;
270 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
271 mark_inode_dirty(dir);
274 ext2_debug ("skipping to next block\n");
276 de = (struct ext2_dir_entry_2 *) page_address(page);
279 CDEBUG(D_INODE, "\n");
280 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
284 page_cache_release(page);
288 CDEBUG(D_INODE, "\n");
289 if (ext2_match (namelen, name, de)) {
292 page_cache_release(page);
296 CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);
297 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
298 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
299 offset += le16_to_cpu(de->rec_len);
300 CDEBUG(D_INODE, "Found enough space de %p, offset %#lx\n", de, offset);
301 if (le32_to_cpu(de->inode)) {
302 CDEBUG(D_INODE, "Inserting new in %p\n", de);
303 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
304 EXT2_DIR_REC_LEN(de->name_len));
305 CDEBUG(D_INODE, "-- de1 at %p\n", de1);
306 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
307 EXT2_DIR_REC_LEN(de->name_len));
308 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
311 CDEBUG(D_INODE, "Reclen adjusted; copy %d bytes to %p, page at %#lx EOP at %#lx\n", namelen, de->name, page_address(page), page_address(page) + PAGE_SIZE);
313 de->name_len = namelen;
315 memcpy (de->name, name, namelen);
316 CDEBUG(D_INODE, "Copy done\n");
318 * XXX shouldn't update any times until successful
319 * completion of syscall, but too many callers depend
322 * XXX similarly, too many callers depend on
323 * ext2_new_inode() setting the times, but error
324 * recovery deletes the inode, so the worst that can
325 * happen is that the times are slightly out of date
326 * and/or different from the directory change time.
328 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
329 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
330 mark_inode_dirty(dir);
331 dir->i_version = ++event;
334 PDEBUG(page, "addentry");
335 CDEBUG(D_INODE, "Regular exit from add_entry");
339 CDEBUG(D_INODE, "\n");
340 offset += le16_to_cpu(de->rec_len);
341 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
344 CDEBUG(D_INODE, "\n");
347 page_cache_release(page);
348 PDEBUG(page, "addentry");
354 * ext2_delete_entry deletes a directory entry by merging it with the
357 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
360 struct ext2_dir_entry_2 * de, * pde;
365 de = (struct ext2_dir_entry_2 *) page_address(page);
366 while (i < PAGE_SIZE) {
367 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
373 cpu_to_le16(le16_to_cpu(pde->rec_len) +
374 le16_to_cpu(dir->rec_len));
379 i += le16_to_cpu(de->rec_len);
381 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
387 static inline void ext2_set_de_type(struct super_block *sb,
388 struct ext2_dir_entry_2 *de,
390 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
393 de->file_type = EXT2_FT_CHRDEV;
394 else if (S_ISBLK(mode))
395 de->file_type = EXT2_FT_BLKDEV;
396 else if (S_ISFIFO(mode))
397 de->file_type = EXT2_FT_FIFO;
398 else if (S_ISLNK(mode))
399 de->file_type = EXT2_FT_SYMLINK;
400 else if (S_ISREG(mode))
401 de->file_type = EXT2_FT_REG_FILE;
402 else if (S_ISDIR(mode))
403 de->file_type = EXT2_FT_DIR;
408 * Display all dentries holding the specified inode.
411 static void show_dentry(struct list_head * dlist, int subdirs)
413 struct list_head *tmp = dlist;
415 while ((tmp = tmp->next) != dlist) {
416 struct dentry * dentry;
417 const char * unhashed = "";
420 dentry = list_entry(tmp, struct dentry, d_child);
422 dentry = list_entry(tmp, struct dentry, d_alias);
424 if (list_empty(&dentry->d_hash))
425 unhashed = "(unhashed)";
427 if ( dentry->d_inode )
428 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
429 dentry->d_parent->d_name.name,
430 dentry->d_name.name, dentry->d_count,
431 unhashed, dentry->d_inode->i_ino,
432 dentry->d_inode->i_dev,
433 dentry->d_inode->i_count);
435 printk("show_dentry: %s/%s, d_count=%d%s \n",
436 dentry->d_parent->d_name.name,
437 dentry->d_name.name, dentry->d_count,
445 * By the time this is called, we already have created
446 * the directory cache entry for the new file, but it
447 * is so far negative - it has no inode.
449 * If the create succeeds, we fill in the inode information
450 * with d_instantiate().
452 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
454 struct inode * inode;
456 struct ext2_dir_entry_2 * de;
463 * N.B. Several error exits in ext2_new_inode don't set err.
465 ino = iops(dir)->o_create(iid(dir), 0, &err);
469 inode = iget(dir->i_sb, ino);
470 if (!inode || !list_empty(&inode->i_dentry)) {
471 CDEBUG(D_INODE, "No inode, ino %ld\n", ino);
476 inode->i_op = &obdfs_file_inode_operations;
477 inode->i_mode = mode;
478 mark_inode_dirty(inode);
479 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
482 mark_inode_dirty(inode);
487 de->inode = cpu_to_le32(inode->i_ino);
488 ext2_set_de_type(dir->i_sb, de, S_IFREG);
489 dir->i_version = ++event;
490 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
494 ll_rw_block (WRITE, 1, &bh);
498 page_cache_release(page);
499 d_instantiate(dentry, inode);
504 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
506 struct inode * inode;
508 struct ext2_dir_entry_2 * de;
516 * N.B. Several error exits in ext2_new_inode don't set err.
518 ino = iops(dir)->o_create(iid(dir), 0, &err);
521 inode = iget(dir->i_sb, ino);
525 inode->i_uid = current->fsuid;
526 init_special_inode(inode, mode, rdev);
527 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
530 de->inode = cpu_to_le32(inode->i_ino);
531 dir->i_version = ++event;
532 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
533 mark_inode_dirty(inode);
534 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
539 ll_rw_block (WRITE, 1, &bh);
543 d_instantiate(dentry, inode);
544 page_cache_release(page);
551 mark_inode_dirty(inode);
556 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
558 struct inode * inode;
559 struct page *page, *inode_page;
560 struct ext2_dir_entry_2 * de;
567 if (dir->i_nlink >= EXT2_LINK_MAX)
571 ino = iops(dir)->o_create(iid(dir), 0, &err);
574 inode = iget(dir->i_sb, ino);
579 inode->i_op = &obdfs_dir_inode_operations;
581 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
583 inode->i_nlink--; /* is this nlink == 0? */
584 mark_inode_dirty(inode);
589 /* create . and .. */
590 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
591 de->inode = cpu_to_le32(inode->i_ino);
593 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
594 strcpy (de->name, ".");
595 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
597 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
598 de->inode = cpu_to_le32(dir->i_ino);
599 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
601 strcpy (de->name, "..");
602 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
604 iops(dir)->o_brw(WRITE, iid(dir), inode, inode_page, 1);
605 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
606 inode->i_size = PAGE_SIZE;
607 UnlockPage(inode_page);
608 page_cache_release(inode_page);
611 inode->i_mode = S_IFDIR | mode;
612 if (dir->i_mode & S_ISGID)
613 inode->i_mode |= S_ISGID;
614 mark_inode_dirty(inode);
616 /* now deal with the parent */
617 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
622 de->inode = cpu_to_le32(inode->i_ino);
623 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
624 dir->i_version = ++event;
628 ll_rw_block (WRITE, 1, &bh);
633 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
634 mark_inode_dirty(dir);
635 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 1);
637 page_cache_release(page);
638 d_instantiate(dentry, inode);
646 mark_inode_dirty(inode);
654 * routine to check that the specified directory is empty (for rmdir)
656 static int empty_dir (struct inode * inode)
658 unsigned long offset;
660 struct ext2_dir_entry_2 * de, * de1;
661 struct super_block * sb;
664 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
665 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
666 ext2_warning (inode->i_sb, "empty_dir",
667 "bad directory (dir #%lu) - no data block",
671 de = (struct ext2_dir_entry_2 *) page_address(page);
672 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
673 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
674 strcmp (".", de->name) || strcmp ("..", de1->name)) {
675 ext2_warning (inode->i_sb, "empty_dir",
676 "bad directory (dir #%lu) - no `.' or `..'",
678 page_cache_release(page);
681 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
682 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
683 while (offset < inode->i_size ) {
684 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
687 page_cache_release(page);
689 page = obdfs_getpage(inode, offset, 0, LOCKED);
692 ext2_error (sb, "empty_dir",
693 "directory #%lu contains a hole at offset %lu",
694 inode->i_ino, offset);
696 offset += sb->s_blocksize;
699 de = (struct ext2_dir_entry_2 *) page_address(page);
701 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
704 page_cache_release(page);
707 if (le32_to_cpu(de->inode)) {
709 page_cache_release(page);
712 offset += le16_to_cpu(de->rec_len);
713 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
716 page_cache_release(page);
720 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
723 struct inode * inode;
725 struct ext2_dir_entry_2 * de;
730 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
734 inode = dentry->d_inode;
738 if (le32_to_cpu(de->inode) != inode->i_ino)
742 if (!empty_dir (inode))
745 retval = obdfs_delete_entry (de, page);
746 dir->i_version = ++event;
749 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
753 ll_rw_block (WRITE, 1, &bh);
757 if (inode->i_nlink != 2)
758 ext2_warning (inode->i_sb, "ext2_rmdir",
759 "empty directory has nlink!=2 (%d)",
761 inode->i_version = ++event;
764 mark_inode_dirty(inode);
766 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
767 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
768 mark_inode_dirty(dir);
773 page_cache_release(page);
778 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
781 struct inode * inode;
783 struct ext2_dir_entry_2 * de;
788 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
792 inode = dentry->d_inode;
796 if (le32_to_cpu(de->inode) != inode->i_ino)
799 if (!inode->i_nlink) {
800 ext2_warning (inode->i_sb, "ext2_unlink",
801 "Deleting nonexistent file (%lu), %d",
802 inode->i_ino, inode->i_nlink);
805 retval = obdfs_delete_entry (de, page);
808 dir->i_version = ++event;
809 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
813 ll_rw_block (WRITE, 1, &bh);
817 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
818 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
819 mark_inode_dirty(dir);
821 mark_inode_dirty(inode);
822 inode->i_ctime = dir->i_ctime;
824 d_delete(dentry); /* This also frees the inode */
828 page_cache_release(page);
833 int obdfs_symlink (struct inode * dir, struct dentry *dentry, const char * symname)
835 struct ext2_dir_entry_2 * de;
836 struct inode * inode;
837 struct page* page = NULL, * name_page = NULL;
839 int i, l, err = -EIO;
845 * N.B. Several error exits in ext2_new_inode don't set err.
847 ino = iops(dir)->o_create(iid(dir), 0, &err);
852 inode = iget(dir->i_sb, ino);
857 inode->i_mode = S_IFLNK | S_IRWXUGO;
858 inode->i_op = &obdfs_symlink_inode_operations;
859 for (l = 0; l < inode->i_sb->s_blocksize - 1 &&
863 /* For obdfs we always use normal (not fast) symlinks
864 if (l >= sizeof (inode->u.ext2_i.i_data)) { */
865 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
867 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
870 mark_inode_dirty(inode);
875 link = (char *)page_address(name_page);
877 link = (char *) inode->u.ext2_i.i_data;
879 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
883 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
887 iops(inode)->o_brw(WRITE, iid(inode), inode, name_page, 1);
888 PDEBUG(name_page, "symlink");
889 UnlockPage(name_page);
890 page_cache_release(name_page);
893 mark_inode_dirty(inode);
895 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
898 de->inode = cpu_to_le32(inode->i_ino);
899 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
900 dir->i_version = ++event;
901 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 1);
905 ll_rw_block (WRITE, 1, &bh);
909 d_instantiate(dentry, inode);
917 mark_inode_dirty(inode);
922 int obdfs_link (struct dentry * old_dentry,
923 struct inode * dir, struct dentry *dentry)
925 struct inode *inode = old_dentry->d_inode;
926 struct ext2_dir_entry_2 * de;
932 if (S_ISDIR(inode->i_mode))
935 if (inode->i_nlink >= EXT2_LINK_MAX)
938 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
942 de->inode = cpu_to_le32(inode->i_ino);
943 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
944 dir->i_version = ++event;
945 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
950 ll_rw_block (WRITE, 1, &bh);
954 page_cache_release(page);
956 inode->i_ctime = CURRENT_TIME;
957 mark_inode_dirty(inode);
959 d_instantiate(dentry, inode);
963 #define PARENT_INO(buffer) \
964 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
965 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
968 * Anybody can rename anything with this: the permission checks are left to the
969 * higher-level routines.
971 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
972 struct inode * new_dir, struct dentry *new_dentry)
974 struct inode * old_inode, * new_inode;
975 struct page * old_page, * new_page, * dir_page;
976 struct ext2_dir_entry_2 * old_de, * new_de;
981 new_page = dir_page = NULL;
983 /* does the old entry exist? - if not get out */
984 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
985 PDEBUG(old_page, "rename - old page");
987 * Check for inode number is _not_ due to possible IO errors.
988 * We might rmdir the source, keep it as pwd of some process
989 * and merrily kill the link to whatever was created under the
990 * same name. Goodbye sticky bit ;-<
992 old_inode = old_dentry->d_inode;
994 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
998 new_inode = new_dentry->d_inode;
999 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
1000 new_dentry->d_name.len, &new_de, NOLOCK);
1001 PDEBUG(new_page, "rename - new page ");
1004 page_cache_release(new_page);
1007 DQUOT_INIT(new_inode);
1010 /* in this case we to check more ... */
1011 if (S_ISDIR(old_inode->i_mode)) {
1012 /* can only rename into empty new directory */
1014 retval = -ENOTEMPTY;
1015 if (!empty_dir (new_inode))
1019 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1020 PDEBUG(dir_page, "rename dir page");
1024 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1027 if (!new_inode && new_dir!=old_dir &&
1028 new_dir->i_nlink >= EXT2_LINK_MAX)
1031 /* create the target dir entry */
1033 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1034 new_dentry->d_name.len, &new_de,
1036 PDEBUG(new_page, "rename new page");
1040 new_dir->i_version = ++event;
1043 * remove the old entry
1045 new_de->inode = le32_to_cpu(old_inode->i_ino);
1046 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1047 EXT2_FEATURE_INCOMPAT_FILETYPE))
1048 new_de->file_type = old_de->file_type;
1050 obdfs_delete_entry (old_de, old_page);
1052 old_dir->i_version = ++event;
1054 new_inode->i_nlink--;
1055 new_inode->i_ctime = CURRENT_TIME;
1056 mark_inode_dirty(new_inode);
1058 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1059 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1060 mark_inode_dirty(old_dir);
1062 PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
1063 iops(old_inode)->o_brw(WRITE, iid(old_inode), old_inode, dir_page, 0);
1065 mark_inode_dirty(old_dir);
1067 new_inode->i_nlink--;
1068 mark_inode_dirty(new_inode);
1071 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1072 mark_inode_dirty(new_dir);
1075 if ( old_page != new_page ) {
1076 unsigned long index = old_page->index;
1077 /* lock the old_page and release unlocked copy */
1078 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1079 page_cache_release(old_page);
1080 old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
1081 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1082 iops(old_dir)->o_brw(WRITE, iid(old_dir), old_dir, old_page,0);
1085 if (IS_SYNC(old_dir)) {
1086 ll_rw_block (WRITE, 1, &old_bh);
1087 wait_on_buffer (old_bh);
1090 iops(new_dir)->o_brw(WRITE, iid(new_dir), new_dir, new_page, 0);
1092 if (IS_SYNC(new_dir)) {
1093 ll_rw_block (WRITE, 1, &new_bh);
1094 wait_on_buffer (new_bh);
1101 if (old_page && PageLocked(old_page) )
1102 UnlockPage(old_page);
1104 page_cache_release(old_page);
1105 if (new_page && PageLocked(new_page) )
1106 UnlockPage(new_page);
1108 page_cache_release(new_page);
1109 if (dir_page && PageLocked(dir_page) )
1110 UnlockPage(dir_page);
1112 page_cache_release(dir_page);