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 printk("Bad entry at %p len %d\n", de, de_len);
132 de = (struct ext2_dir_entry_2 *)
133 ((char *) de + de_len);
134 /* CDEBUG(D_INODE, "Next while %lx\n", offset); */
138 page_cache_release(page);
140 CDEBUG(D_INODE, "Next for %lx\n", offset);
144 CDEBUG(D_INODE, "Negative case, page %p, offset %ld\n", page, offset);
148 page_cache_release(page);
154 struct dentry *obdfs_lookup(struct inode * dir, struct dentry *dentry)
156 struct inode * inode;
157 struct ext2_dir_entry_2 * de;
161 if (dentry->d_name.len > EXT2_NAME_LEN)
162 return ERR_PTR(-ENAMETOOLONG);
164 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
167 CDEBUG(D_INODE, "No page - negative entry.\n");
169 CDEBUG(D_INODE, "Danger: PAGE but de.\n");
170 return ERR_PTR(-ENOENT);
173 unsigned long ino = le32_to_cpu(de->inode);
175 page_cache_release(page);
176 inode = iget(dir->i_sb, ino);
179 CDEBUG(D_INODE, "No inode.\n");
181 return ERR_PTR(-EACCES);
184 d_add(dentry, inode);
193 * adds a file entry to the specified directory, using the same
194 * semantics as ext2_find_entry(). It returns NULL if it failed.
196 * NOTE!! The inode part of 'de' is left at 0 - which means you
197 * may not sleep between calling this and putting something into
198 * the entry, as someone else might have used it while you slept.
200 * returns a locked and held page upon success
202 static struct page *obdfs_add_entry (struct inode * dir,
203 const char * name, int namelen,
204 struct ext2_dir_entry_2 ** res_dir,
207 unsigned long offset;
208 unsigned short rec_len;
210 struct ext2_dir_entry_2 * de, * de1;
211 struct super_block * sb;
216 if (!dir || !dir->i_nlink) {
227 * Is this a busy deleted directory? Can't create new files if so
229 if (dir->i_size == 0)
235 page = obdfs_getpage(dir, 0, 0, LOCKED);
240 rec_len = EXT2_DIR_REC_LEN(namelen);
241 CDEBUG(D_INODE, "reclen: %d\n", rec_len);
243 de = (struct ext2_dir_entry_2 *) page_address(page);
246 CDEBUG(D_INODE, "Considering entry at %p, (page at %#lx - %#lx), offset %ld\n",
247 de, page_address(page), page_address(page) + PAGE_SIZE, offset);
248 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
250 page_cache_release(page);
251 page = obdfs_getpage(dir, offset, 1, LOCKED);
256 if (dir->i_size <= offset) {
257 if (dir->i_size == 0) {
263 CDEBUG(D_INODE, "creating next block\n");
265 de = (struct ext2_dir_entry_2 *) page_address(page);
267 de->rec_len = le16_to_cpu(PAGE_SIZE);
268 dir->i_size = offset + PAGE_SIZE;
269 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
270 mark_inode_dirty(dir);
273 ext2_debug ("skipping to next block\n");
275 de = (struct ext2_dir_entry_2 *) page_address(page);
278 CDEBUG(D_INODE, "\n");
279 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
283 page_cache_release(page);
287 CDEBUG(D_INODE, "\n");
288 if (ext2_match (namelen, name, de)) {
291 page_cache_release(page);
295 CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);
296 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
297 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
298 offset += le16_to_cpu(de->rec_len);
299 CDEBUG(D_INODE, "Found enough space de %p, offset %#lx\n", de, offset);
300 if (le32_to_cpu(de->inode)) {
301 CDEBUG(D_INODE, "Inserting new in %p\n", de);
302 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
303 EXT2_DIR_REC_LEN(de->name_len));
304 CDEBUG(D_INODE, "-- de1 at %p\n", de1);
305 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
306 EXT2_DIR_REC_LEN(de->name_len));
307 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
310 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);
312 de->name_len = namelen;
314 memcpy (de->name, name, namelen);
315 CDEBUG(D_INODE, "Copy done\n");
317 * XXX shouldn't update any times until successful
318 * completion of syscall, but too many callers depend
321 * XXX similarly, too many callers depend on
322 * ext2_new_inode() setting the times, but error
323 * recovery deletes the inode, so the worst that can
324 * happen is that the times are slightly out of date
325 * and/or different from the directory change time.
327 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
328 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
329 mark_inode_dirty(dir);
330 dir->i_version = ++event;
333 PDEBUG(page, "addentry");
334 CDEBUG(D_INODE, "Regular exit from add_entry");
338 CDEBUG(D_INODE, "\n");
339 offset += le16_to_cpu(de->rec_len);
340 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
343 CDEBUG(D_INODE, "\n");
346 page_cache_release(page);
347 PDEBUG(page, "addentry");
353 * ext2_delete_entry deletes a directory entry by merging it with the
356 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
359 struct ext2_dir_entry_2 * de, * pde;
364 de = (struct ext2_dir_entry_2 *) page_address(page);
365 while (i < PAGE_SIZE) {
366 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
372 cpu_to_le16(le16_to_cpu(pde->rec_len) +
373 le16_to_cpu(dir->rec_len));
378 i += le16_to_cpu(de->rec_len);
380 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
386 static inline void ext2_set_de_type(struct super_block *sb,
387 struct ext2_dir_entry_2 *de,
389 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
392 de->file_type = EXT2_FT_CHRDEV;
393 else if (S_ISBLK(mode))
394 de->file_type = EXT2_FT_BLKDEV;
395 else if (S_ISFIFO(mode))
396 de->file_type = EXT2_FT_FIFO;
397 else if (S_ISLNK(mode))
398 de->file_type = EXT2_FT_SYMLINK;
399 else if (S_ISREG(mode))
400 de->file_type = EXT2_FT_REG_FILE;
401 else if (S_ISDIR(mode))
402 de->file_type = EXT2_FT_DIR;
407 * Display all dentries holding the specified inode.
410 static void show_dentry(struct list_head * dlist, int subdirs)
412 struct list_head *tmp = dlist;
414 while ((tmp = tmp->next) != dlist) {
415 struct dentry * dentry;
416 const char * unhashed = "";
419 dentry = list_entry(tmp, struct dentry, d_child);
421 dentry = list_entry(tmp, struct dentry, d_alias);
423 if (list_empty(&dentry->d_hash))
424 unhashed = "(unhashed)";
426 if ( dentry->d_inode )
427 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
428 dentry->d_parent->d_name.name,
429 dentry->d_name.name, dentry->d_count,
430 unhashed, dentry->d_inode->i_ino,
431 dentry->d_inode->i_dev,
432 dentry->d_inode->i_count);
434 printk("show_dentry: %s/%s, d_count=%d%s \n",
435 dentry->d_parent->d_name.name,
436 dentry->d_name.name, dentry->d_count,
444 * By the time this is called, we already have created
445 * the directory cache entry for the new file, but it
446 * is so far negative - it has no inode.
448 * If the create succeeds, we fill in the inode information
449 * with d_instantiate().
451 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
453 struct inode * inode;
455 struct ext2_dir_entry_2 * de;
462 * N.B. Several error exits in ext2_new_inode don't set err.
464 err = iops(dir)->o_create(iid(dir), 0, &id);
467 inode = iget(dir->i_sb, (ino_t)id);
468 if (!inode || !list_empty(&inode->i_dentry)) {
469 CDEBUG(D_INODE, "No inode, ino %ld\n", id);
474 inode->i_op = &obdfs_file_inode_operations;
475 inode->i_mode = mode;
476 mark_inode_dirty(inode);
477 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
480 mark_inode_dirty(inode);
485 de->inode = cpu_to_le32(inode->i_ino);
486 ext2_set_de_type(dir->i_sb, de, S_IFREG);
487 dir->i_version = ++event;
488 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
492 ll_rw_block (WRITE, 1, &bh);
496 page_cache_release(page);
497 d_instantiate(dentry, inode);
502 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
504 struct inode * inode;
506 struct ext2_dir_entry_2 * de;
514 * N.B. Several error exits in ext2_new_inode don't set err.
516 err = iops(dir)->o_create(iid(dir), 0, &id);
519 inode = iget(dir->i_sb, (ino_t)id);
523 inode->i_uid = current->fsuid;
524 init_special_inode(inode, mode, rdev);
525 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
528 de->inode = cpu_to_le32(inode->i_ino);
529 dir->i_version = ++event;
530 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
531 mark_inode_dirty(inode);
532 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
537 ll_rw_block (WRITE, 1, &bh);
541 d_instantiate(dentry, inode);
542 page_cache_release(page);
549 mark_inode_dirty(inode);
554 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
556 struct inode * inode;
557 struct page *page, *inode_page;
558 struct ext2_dir_entry_2 * de;
565 if (dir->i_nlink >= EXT2_LINK_MAX)
568 err = iops(dir)->o_create(iid(dir), 0, &id);
571 inode = iget(dir->i_sb, (ino_t)id);
576 inode->i_op = &obdfs_dir_inode_operations;
578 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
580 inode->i_nlink--; /* is this nlink == 0? */
581 mark_inode_dirty(inode);
586 /* create . and .. */
587 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
588 de->inode = cpu_to_le32(inode->i_ino);
590 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
591 strcpy (de->name, ".");
592 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
594 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
595 de->inode = cpu_to_le32(dir->i_ino);
596 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
598 strcpy (de->name, "..");
599 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
601 iops(dir)->o_brw(WRITE, iid(dir), inode, inode_page, 1);
602 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
603 inode->i_size = PAGE_SIZE;
604 UnlockPage(inode_page);
605 page_cache_release(inode_page);
608 inode->i_mode = S_IFDIR | mode;
609 if (dir->i_mode & S_ISGID)
610 inode->i_mode |= S_ISGID;
611 mark_inode_dirty(inode);
613 /* now deal with the parent */
614 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
619 de->inode = cpu_to_le32(inode->i_ino);
620 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
621 dir->i_version = ++event;
625 ll_rw_block (WRITE, 1, &bh);
630 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
631 mark_inode_dirty(dir);
632 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 1);
634 page_cache_release(page);
635 d_instantiate(dentry, inode);
643 mark_inode_dirty(inode);
651 * routine to check that the specified directory is empty (for rmdir)
653 static int empty_dir (struct inode * inode)
655 unsigned long offset;
657 struct ext2_dir_entry_2 * de, * de1;
658 struct super_block * sb;
661 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
662 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
663 ext2_warning (inode->i_sb, "empty_dir",
664 "bad directory (dir #%lu) - no data block",
668 de = (struct ext2_dir_entry_2 *) page_address(page);
669 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
670 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
671 strcmp (".", de->name) || strcmp ("..", de1->name)) {
672 ext2_warning (inode->i_sb, "empty_dir",
673 "bad directory (dir #%lu) - no `.' or `..'",
675 page_cache_release(page);
678 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
679 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
680 while (offset < inode->i_size ) {
681 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
684 page_cache_release(page);
686 page = obdfs_getpage(inode, offset, 0, LOCKED);
689 ext2_error (sb, "empty_dir",
690 "directory #%lu contains a hole at offset %lu",
691 inode->i_ino, offset);
693 offset += sb->s_blocksize;
696 de = (struct ext2_dir_entry_2 *) page_address(page);
698 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
701 page_cache_release(page);
704 if (le32_to_cpu(de->inode)) {
706 page_cache_release(page);
709 offset += le16_to_cpu(de->rec_len);
710 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
713 page_cache_release(page);
717 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
720 struct inode * inode;
722 struct ext2_dir_entry_2 * de;
727 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
731 inode = dentry->d_inode;
735 if (le32_to_cpu(de->inode) != inode->i_ino)
739 if (!empty_dir (inode))
742 retval = obdfs_delete_entry (de, page);
743 dir->i_version = ++event;
746 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
750 ll_rw_block (WRITE, 1, &bh);
754 if (inode->i_nlink != 2)
755 ext2_warning (inode->i_sb, "ext2_rmdir",
756 "empty directory has nlink!=2 (%d)",
758 inode->i_version = ++event;
761 mark_inode_dirty(inode);
763 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
764 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
765 mark_inode_dirty(dir);
770 page_cache_release(page);
775 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
778 struct inode * inode;
780 struct ext2_dir_entry_2 * de;
785 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
789 inode = dentry->d_inode;
793 if (le32_to_cpu(de->inode) != inode->i_ino)
796 if (!inode->i_nlink) {
797 ext2_warning (inode->i_sb, "ext2_unlink",
798 "Deleting nonexistent file (%lu), %d",
799 inode->i_ino, inode->i_nlink);
802 retval = obdfs_delete_entry (de, page);
805 dir->i_version = ++event;
806 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
810 ll_rw_block (WRITE, 1, &bh);
814 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
815 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
816 mark_inode_dirty(dir);
818 mark_inode_dirty(inode);
819 inode->i_ctime = dir->i_ctime;
821 d_delete(dentry); /* This also frees the inode */
825 page_cache_release(page);
830 int obdfs_symlink (struct inode * dir, struct dentry *dentry, const char * symname)
832 struct ext2_dir_entry_2 * de;
833 struct inode * inode;
834 struct page* page = NULL, * name_page = NULL;
836 int i, l, err = -EIO;
842 * N.B. Several error exits in ext2_new_inode don't set err.
844 err = iops(dir)->o_create(iid(dir), 0, &id);
849 inode = iget(dir->i_sb, (ino_t)id);
854 inode->i_mode = S_IFLNK | S_IRWXUGO;
855 inode->i_op = &obdfs_symlink_inode_operations;
856 for (l = 0; l < inode->i_sb->s_blocksize - 1 &&
860 if (l >= sizeof (inode->u.ext2_i.i_data)) {
861 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
863 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
866 mark_inode_dirty(inode);
871 link = (char *)page_address(name_page);
873 link = (char *) inode->u.ext2_i.i_data;
875 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
879 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
883 iops(inode)->o_brw(WRITE, iid(inode), inode, name_page, 1);
884 PDEBUG(name_page, "symlink");
885 UnlockPage(name_page);
886 page_cache_release(name_page);
889 mark_inode_dirty(inode);
891 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
894 de->inode = cpu_to_le32(inode->i_ino);
895 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
896 dir->i_version = ++event;
897 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 1);
901 ll_rw_block (WRITE, 1, &bh);
905 d_instantiate(dentry, inode);
913 mark_inode_dirty(inode);
918 int obdfs_link (struct dentry * old_dentry,
919 struct inode * dir, struct dentry *dentry)
921 struct inode *inode = old_dentry->d_inode;
922 struct ext2_dir_entry_2 * de;
928 if (S_ISDIR(inode->i_mode))
931 if (inode->i_nlink >= EXT2_LINK_MAX)
934 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
938 de->inode = cpu_to_le32(inode->i_ino);
939 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
940 dir->i_version = ++event;
941 iops(dir)->o_brw(WRITE, iid(dir), dir, page, 0);
946 ll_rw_block (WRITE, 1, &bh);
950 page_cache_release(page);
952 inode->i_ctime = CURRENT_TIME;
953 mark_inode_dirty(inode);
955 d_instantiate(dentry, inode);
959 #define PARENT_INO(buffer) \
960 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
961 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
964 * Anybody can rename anything with this: the permission checks are left to the
965 * higher-level routines.
967 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
968 struct inode * new_dir, struct dentry *new_dentry)
970 struct inode * old_inode, * new_inode;
971 struct page * old_page, * new_page, * dir_page;
972 struct ext2_dir_entry_2 * old_de, * new_de;
977 new_page = dir_page = NULL;
979 /* does the old entry exist? - if not get out */
980 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
981 PDEBUG(old_page, "rename - old page");
983 * Check for inode number is _not_ due to possible IO errors.
984 * We might rmdir the source, keep it as pwd of some process
985 * and merrily kill the link to whatever was created under the
986 * same name. Goodbye sticky bit ;-<
988 old_inode = old_dentry->d_inode;
990 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
994 new_inode = new_dentry->d_inode;
995 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
996 new_dentry->d_name.len, &new_de, NOLOCK);
997 PDEBUG(new_page, "rename - new page ");
1000 page_cache_release(new_page);
1003 DQUOT_INIT(new_inode);
1006 /* in this case we to check more ... */
1007 if (S_ISDIR(old_inode->i_mode)) {
1008 /* can only rename into empty new directory */
1010 retval = -ENOTEMPTY;
1011 if (!empty_dir (new_inode))
1015 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1016 PDEBUG(dir_page, "rename dir page");
1020 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1023 if (!new_inode && new_dir!=old_dir &&
1024 new_dir->i_nlink >= EXT2_LINK_MAX)
1027 /* create the target dir entry */
1029 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1030 new_dentry->d_name.len, &new_de,
1032 PDEBUG(new_page, "rename new page");
1036 new_dir->i_version = ++event;
1039 * remove the old entry
1041 new_de->inode = le32_to_cpu(old_inode->i_ino);
1042 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1043 EXT2_FEATURE_INCOMPAT_FILETYPE))
1044 new_de->file_type = old_de->file_type;
1046 obdfs_delete_entry (old_de, old_page);
1048 old_dir->i_version = ++event;
1050 new_inode->i_nlink--;
1051 new_inode->i_ctime = CURRENT_TIME;
1052 mark_inode_dirty(new_inode);
1054 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1055 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1056 mark_inode_dirty(old_dir);
1058 PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
1059 iops(old_inode)->o_brw(WRITE, iid(old_inode), old_inode, dir_page, 0);
1061 mark_inode_dirty(old_dir);
1063 new_inode->i_nlink--;
1064 mark_inode_dirty(new_inode);
1067 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1068 mark_inode_dirty(new_dir);
1071 if ( old_page != new_page ) {
1072 unsigned long index = old_page->index;
1073 /* lock the old_page and release unlocked copy */
1074 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1075 page_cache_release(old_page);
1076 old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
1077 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1078 iops(old_dir)->o_brw(WRITE, iid(old_dir), old_dir, old_page,0);
1081 if (IS_SYNC(old_dir)) {
1082 ll_rw_block (WRITE, 1, &old_bh);
1083 wait_on_buffer (old_bh);
1086 iops(new_dir)->o_brw(WRITE, iid(new_dir), new_dir, new_page, 0);
1088 if (IS_SYNC(new_dir)) {
1089 ll_rw_block (WRITE, 1, &new_bh);
1090 wait_on_buffer (new_bh);
1097 if (old_page && PageLocked(old_page) )
1098 UnlockPage(old_page);
1100 page_cache_release(old_page);
1101 if (new_page && PageLocked(new_page) )
1102 UnlockPage(new_page);
1104 page_cache_release(new_page);
1105 if (dir_page && PageLocked(dir_page) )
1106 UnlockPage(dir_page);
1108 page_cache_release(dir_page);