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
203 /* XXX I believe these pages should in fact NOT be locked */
205 static struct page *obdfs_add_entry (struct inode * dir,
206 const char * name, int namelen,
207 struct ext2_dir_entry_2 ** res_dir,
210 unsigned long offset;
211 unsigned short rec_len;
213 struct ext2_dir_entry_2 * de, * de1;
214 struct super_block * sb;
219 if (!dir || !dir->i_nlink) {
230 * Is this a busy deleted directory? Can't create new files if so
232 if (dir->i_size == 0)
238 page = obdfs_getpage(dir, 0, 0, LOCKED);
243 rec_len = EXT2_DIR_REC_LEN(namelen);
244 CDEBUG(D_INODE, "reclen: %d\n", rec_len);
246 de = (struct ext2_dir_entry_2 *) page_address(page);
249 CDEBUG(D_INODE, "Considering entry at %p, (page at %#lx - %#lx), offset %ld\n",
250 de, page_address(page), page_address(page) + PAGE_SIZE, offset);
251 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
253 page_cache_release(page);
254 page = obdfs_getpage(dir, offset, 1, LOCKED);
259 if (dir->i_size <= offset) {
260 if (dir->i_size == 0) {
266 CDEBUG(D_INODE, "creating next block\n");
268 de = (struct ext2_dir_entry_2 *) page_address(page);
270 de->rec_len = le16_to_cpu(PAGE_SIZE);
271 dir->i_size = offset + PAGE_SIZE;
272 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
273 mark_inode_dirty(dir);
276 ext2_debug ("skipping to next block\n");
278 de = (struct ext2_dir_entry_2 *) page_address(page);
281 CDEBUG(D_INODE, "\n");
282 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
286 page_cache_release(page);
290 CDEBUG(D_INODE, "\n");
291 if (ext2_match (namelen, name, de)) {
294 page_cache_release(page);
298 CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);
299 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
300 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
301 offset += le16_to_cpu(de->rec_len);
302 CDEBUG(D_INODE, "Found enough space de %p, offset %#lx\n", de, offset);
303 if (le32_to_cpu(de->inode)) {
304 CDEBUG(D_INODE, "Inserting new in %p\n", de);
305 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
306 EXT2_DIR_REC_LEN(de->name_len));
307 CDEBUG(D_INODE, "-- de1 at %p\n", de1);
308 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
309 EXT2_DIR_REC_LEN(de->name_len));
310 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
313 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);
315 de->name_len = namelen;
317 memcpy (de->name, name, namelen);
318 CDEBUG(D_INODE, "Copy done\n");
320 * XXX shouldn't update any times until successful
321 * completion of syscall, but too many callers depend
324 * XXX similarly, too many callers depend on
325 * ext2_new_inode() setting the times, but error
326 * recovery deletes the inode, so the worst that can
327 * happen is that the times are slightly out of date
328 * and/or different from the directory change time.
330 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
331 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
332 mark_inode_dirty(dir);
333 dir->i_version = ++event;
336 PDEBUG(page, "addentry");
337 CDEBUG(D_INODE, "Regular exit from add_entry");
341 CDEBUG(D_INODE, "\n");
342 offset += le16_to_cpu(de->rec_len);
343 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
346 CDEBUG(D_INODE, "\n");
349 page_cache_release(page);
350 PDEBUG(page, "addentry");
356 * ext2_delete_entry deletes a directory entry by merging it with the
359 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
362 struct ext2_dir_entry_2 * de, * pde;
367 de = (struct ext2_dir_entry_2 *) page_address(page);
368 while (i < PAGE_SIZE) {
369 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
375 cpu_to_le16(le16_to_cpu(pde->rec_len) +
376 le16_to_cpu(dir->rec_len));
381 i += le16_to_cpu(de->rec_len);
383 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
389 static inline void ext2_set_de_type(struct super_block *sb,
390 struct ext2_dir_entry_2 *de,
392 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
395 de->file_type = EXT2_FT_CHRDEV;
396 else if (S_ISBLK(mode))
397 de->file_type = EXT2_FT_BLKDEV;
398 else if (S_ISFIFO(mode))
399 de->file_type = EXT2_FT_FIFO;
400 else if (S_ISLNK(mode))
401 de->file_type = EXT2_FT_SYMLINK;
402 else if (S_ISREG(mode))
403 de->file_type = EXT2_FT_REG_FILE;
404 else if (S_ISDIR(mode))
405 de->file_type = EXT2_FT_DIR;
410 * Display all dentries holding the specified inode.
413 static void show_dentry(struct list_head * dlist, int subdirs)
415 struct list_head *tmp = dlist;
417 while ((tmp = tmp->next) != dlist) {
418 struct dentry * dentry;
419 const char * unhashed = "";
422 dentry = list_entry(tmp, struct dentry, d_child);
424 dentry = list_entry(tmp, struct dentry, d_alias);
426 if (list_empty(&dentry->d_hash))
427 unhashed = "(unhashed)";
429 if ( dentry->d_inode )
430 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
431 dentry->d_parent->d_name.name,
432 dentry->d_name.name, dentry->d_count,
433 unhashed, dentry->d_inode->i_ino,
434 dentry->d_inode->i_dev,
435 dentry->d_inode->i_count);
437 printk("show_dentry: %s/%s, d_count=%d%s \n",
438 dentry->d_parent->d_name.name,
439 dentry->d_name.name, dentry->d_count,
446 struct inode *obdfs_new_inode(struct inode *dir)
450 struct obdfs_inode_info *oinfo;
456 return ERR_PTR(-ENOMEM);
459 err = IOPS(dir, create)(IID(dir), obdo);
463 inode = iget(dir->i_sb, (unsigned long)obdo->o_id);
467 return ERR_PTR(-EIO);
470 if (!list_empty(&inode->i_dentry)) {
471 CDEBUG(D_INODE, "New inode (%ld) has aliases!\n",
475 return ERR_PTR(-EIO);
480 oinfo = inode->u.generic_ip;
481 INIT_LIST_HEAD(&oinfo->oi_list);
488 * By the time this is called, we already have created
489 * the directory cache entry for the new file, but it
490 * is so far negative - it has no inode.
492 * If the create succeeds, we fill in the inode information
493 * with d_instantiate().
495 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
497 struct inode * inode;
499 struct ext2_dir_entry_2 * de;
504 inode = obdfs_new_inode(dir);
505 if ( IS_ERR(inode) ) {
507 return PTR_ERR(inode);
510 inode->i_op = &obdfs_file_inode_operations;
511 inode->i_mode = mode;
512 mark_inode_dirty(inode);
513 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
516 mark_inode_dirty(inode);
521 de->inode = cpu_to_le32(inode->i_ino);
522 ext2_set_de_type(dir->i_sb, de, S_IFREG);
523 dir->i_version = ++event;
525 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
528 page_cache_release(page);
529 d_instantiate(dentry, inode);
534 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
536 struct inode * inode;
538 struct ext2_dir_entry_2 * de;
543 inode = obdfs_new_inode(dir);
544 if ( IS_ERR(inode) ) {
546 return PTR_ERR(inode);
549 inode->i_uid = current->fsuid;
550 init_special_inode(inode, mode, rdev);
551 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
554 de->inode = cpu_to_le32(inode->i_ino);
555 dir->i_version = ++event;
556 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
557 mark_inode_dirty(inode);
559 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
562 d_instantiate(dentry, inode);
563 page_cache_release(page);
570 mark_inode_dirty(inode);
575 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
577 struct inode * inode;
578 struct page *page, *inode_page;
579 struct ext2_dir_entry_2 * de;
585 if (dir->i_nlink >= EXT2_LINK_MAX)
588 inode = obdfs_new_inode(dir);
589 if ( IS_ERR(inode) ) {
591 return PTR_ERR(inode);
594 inode->i_op = &obdfs_dir_inode_operations;
596 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
598 inode->i_nlink--; /* is this nlink == 0? */
599 mark_inode_dirty(inode);
604 /* create . and .. */
605 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
606 de->inode = cpu_to_le32(inode->i_ino);
608 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
609 strcpy (de->name, ".");
610 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
612 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
613 de->inode = cpu_to_le32(dir->i_ino);
614 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
616 strcpy (de->name, "..");
617 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
619 err = obdfs_do_writepage(inode, inode_page, IS_SYNC(inode));
620 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
621 inode->i_size = PAGE_SIZE;
622 UnlockPage(inode_page);
623 page_cache_release(inode_page);
627 inode->i_mode = S_IFDIR | mode;
628 if (dir->i_mode & S_ISGID)
629 inode->i_mode |= S_ISGID;
630 mark_inode_dirty(inode);
632 /* now deal with the parent */
633 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
638 de->inode = cpu_to_le32(inode->i_ino);
639 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
640 dir->i_version = ++event;
643 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
644 mark_inode_dirty(dir);
645 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
649 page_cache_release(page);
650 d_instantiate(dentry, inode);
658 mark_inode_dirty(inode);
666 * routine to check that the specified directory is empty (for rmdir)
668 static int empty_dir (struct inode * inode)
670 unsigned long offset;
672 struct ext2_dir_entry_2 * de, * de1;
673 struct super_block * sb;
676 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
677 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
678 ext2_warning (inode->i_sb, "empty_dir",
679 "bad directory (dir #%lu) - no data block",
683 de = (struct ext2_dir_entry_2 *) page_address(page);
684 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
685 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
686 strcmp (".", de->name) || strcmp ("..", de1->name)) {
687 ext2_warning (inode->i_sb, "empty_dir",
688 "bad directory (dir #%lu) - no `.' or `..'",
690 page_cache_release(page);
693 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
694 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
695 while (offset < inode->i_size ) {
696 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
699 page_cache_release(page);
701 page = obdfs_getpage(inode, offset, 0, LOCKED);
704 ext2_error (sb, "empty_dir",
705 "directory #%lu contains a hole at offset %lu",
706 inode->i_ino, offset);
708 offset += sb->s_blocksize;
711 de = (struct ext2_dir_entry_2 *) page_address(page);
713 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
716 page_cache_release(page);
719 if (le32_to_cpu(de->inode)) {
721 page_cache_release(page);
724 offset += le16_to_cpu(de->rec_len);
725 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
728 page_cache_release(page);
732 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
735 struct inode * inode;
737 struct ext2_dir_entry_2 * de;
743 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
747 inode = dentry->d_inode;
751 if (le32_to_cpu(de->inode) != inode->i_ino)
755 if (!empty_dir (inode))
758 retval = obdfs_delete_entry (de, page);
759 dir->i_version = ++event;
762 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
765 if (inode->i_nlink != 2)
766 ext2_warning (inode->i_sb, "ext2_rmdir",
767 "empty directory has nlink!=2 (%d)",
769 inode->i_version = ++event;
772 mark_inode_dirty(inode);
774 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
775 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
776 mark_inode_dirty(dir);
781 page_cache_release(page);
786 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
789 struct inode * inode;
791 struct ext2_dir_entry_2 * de;
797 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
801 inode = dentry->d_inode;
805 if (le32_to_cpu(de->inode) != inode->i_ino)
808 if (!inode->i_nlink) {
809 ext2_warning (inode->i_sb, "ext2_unlink",
810 "Deleting nonexistent file (%lu), %d",
811 inode->i_ino, inode->i_nlink);
814 retval = obdfs_delete_entry (de, page);
817 dir->i_version = ++event;
818 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
821 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
822 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
823 mark_inode_dirty(dir);
825 mark_inode_dirty(inode);
826 inode->i_ctime = dir->i_ctime;
828 d_delete(dentry); /* This also frees the inode */
832 page_cache_release(page);
837 int obdfs_symlink (struct inode * dir, struct dentry *dentry, const char * symname)
839 struct ext2_dir_entry_2 * de;
840 struct inode * inode;
841 struct obdfs_inode_info *oinfo;
842 struct page* page = NULL, * name_page = NULL;
844 int i, l, err = -EIO;
848 inode = obdfs_new_inode(dir);
849 oinfo = inode->u.generic_ip;
850 if ( IS_ERR(inode) ) {
852 return PTR_ERR(inode);
855 inode->i_mode = S_IFLNK | S_IRWXUGO;
856 inode->i_op = &obdfs_symlink_inode_operations;
857 for (l = 0; l < inode->i_sb->s_blocksize - 1 &&
861 if (l >= sizeof (oinfo->oi_inline)) {
862 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
864 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
867 mark_inode_dirty(inode);
872 link = (char *)page_address(name_page);
874 link = oinfo->oi_inline;
875 oinfo->oi_flags |= OBD_FL_INLINEDATA;
877 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
881 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
885 obdfs_do_writepage(inode, name_page, IS_SYNC(inode));
886 PDEBUG(name_page, "symlink");
887 UnlockPage(name_page);
888 page_cache_release(name_page);
891 mark_inode_dirty(inode);
893 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
896 de->inode = cpu_to_le32(inode->i_ino);
897 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
898 dir->i_version = ++event;
899 obdfs_do_writepage(dir, page, IS_SYNC(dir));
902 d_instantiate(dentry, inode);
910 mark_inode_dirty(inode);
915 int obdfs_link (struct dentry * old_dentry,
916 struct inode * dir, struct dentry *dentry)
918 struct inode *inode = old_dentry->d_inode;
919 struct ext2_dir_entry_2 * de;
925 if (S_ISDIR(inode->i_mode))
928 if (inode->i_nlink >= EXT2_LINK_MAX)
931 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
935 de->inode = cpu_to_le32(inode->i_ino);
936 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
937 dir->i_version = ++event;
939 obdfs_do_writepage(dir, page, IS_SYNC(dir));
942 page_cache_release(page);
944 inode->i_ctime = CURRENT_TIME;
945 mark_inode_dirty(inode);
947 d_instantiate(dentry, inode);
951 #define PARENT_INO(buffer) \
952 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
953 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
956 * Anybody can rename anything with this: the permission checks are left to the
957 * higher-level routines.
959 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
960 struct inode * new_dir, struct dentry *new_dentry)
962 struct inode * old_inode, * new_inode;
963 struct page * old_page, * new_page, * dir_page;
964 struct ext2_dir_entry_2 * old_de, * new_de;
969 new_page = dir_page = NULL;
971 /* does the old entry exist? - if not get out */
972 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
973 PDEBUG(old_page, "rename - old page");
975 * Check for inode number is _not_ due to possible IO errors.
976 * We might rmdir the source, keep it as pwd of some process
977 * and merrily kill the link to whatever was created under the
978 * same name. Goodbye sticky bit ;-<
980 old_inode = old_dentry->d_inode;
982 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
986 new_inode = new_dentry->d_inode;
987 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
988 new_dentry->d_name.len, &new_de, NOLOCK);
989 PDEBUG(new_page, "rename - new page ");
992 page_cache_release(new_page);
995 DQUOT_INIT(new_inode);
998 /* in this case we to check more ... */
999 if (S_ISDIR(old_inode->i_mode)) {
1000 /* can only rename into empty new directory */
1002 retval = -ENOTEMPTY;
1003 if (!empty_dir (new_inode))
1007 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1008 PDEBUG(dir_page, "rename dir page");
1012 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1015 if (!new_inode && new_dir!=old_dir &&
1016 new_dir->i_nlink >= EXT2_LINK_MAX)
1019 /* create the target dir entry */
1021 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1022 new_dentry->d_name.len, &new_de,
1024 PDEBUG(new_page, "rename new page");
1028 new_dir->i_version = ++event;
1031 * remove the old entry
1033 new_de->inode = le32_to_cpu(old_inode->i_ino);
1034 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1035 EXT2_FEATURE_INCOMPAT_FILETYPE))
1036 new_de->file_type = old_de->file_type;
1038 obdfs_delete_entry (old_de, old_page);
1040 old_dir->i_version = ++event;
1042 new_inode->i_nlink--;
1043 new_inode->i_ctime = CURRENT_TIME;
1044 mark_inode_dirty(new_inode);
1046 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1047 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1048 mark_inode_dirty(old_dir);
1050 PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
1051 obdfs_do_writepage(old_inode, dir_page, IS_SYNC(old_inode));
1053 mark_inode_dirty(old_dir);
1055 new_inode->i_nlink--;
1056 mark_inode_dirty(new_inode);
1059 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1060 mark_inode_dirty(new_dir);
1063 if ( old_page != new_page ) {
1064 unsigned long index = old_page->index;
1065 /* lock the old_page and release unlocked copy */
1066 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1067 page_cache_release(old_page);
1068 old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
1069 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1070 obdfs_do_writepage(old_dir, old_page, IS_SYNC(old_dir));
1073 obdfs_do_writepage(new_dir, new_page, IS_SYNC(new_dir));
1078 if (old_page && PageLocked(old_page) )
1079 UnlockPage(old_page);
1081 page_cache_release(old_page);
1082 if (new_page && PageLocked(new_page) )
1083 UnlockPage(new_page);
1085 page_cache_release(new_page);
1086 if (dir_page && PageLocked(dir_page) )
1087 UnlockPage(dir_page);
1089 page_cache_release(dir_page);