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,
78 struct super_block * sb;
82 CDEBUG(D_INODE, "find entry for %*s\n", namelen, name);
87 if (namelen > EXT2_NAME_LEN)
90 CDEBUG(D_INODE, "dirsize is %Ld\n", dir->i_size);
94 while ( offset < dir->i_size ) {
95 struct ext2_dir_entry_2 * de;
98 page = obdfs_getpage(dir, offset, 0, lock);
101 CDEBUG(D_INODE, "No page, offset %lx\n", offset);
105 de = (struct ext2_dir_entry_2 *) page_address(page);
106 dlimit = (char *)page_address(page) + PAGE_SIZE;
107 while ((char *) de < dlimit) {
108 /* this code is executed quadratically often */
109 /* do minimal checking `by hand' */
111 /* CDEBUG(D_INODE, "Entry %p len %d, page at %#lx - %#lx , offset %lx\n",
112 de, le16_to_cpu(de->rec_len), page_address(page),
113 page_address(page) + PAGE_SIZE, offset); */
115 if ((char *) de + namelen <= dlimit &&
116 ext2_match (namelen, name, de)) {
118 just to be sure, do a full check */
119 if (!obdfs_check_dir_entry("ext2_find_entry",
120 dir, de, page, offset))
126 /* prevent looping on a bad block */
127 de_len = le16_to_cpu(de->rec_len);
129 printk("Bad entry at %p len %d\n", de, de_len);
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);
153 } /* obdfs_find_entry */
155 struct dentry *obdfs_lookup(struct inode *dir, struct dentry *dentry)
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,
169 CDEBUG(D_INODE, "No page - negative entry.\n");
171 CDEBUG(D_INODE, "Danger: PAGE but de.\n");
172 return ERR_PTR(-ENOENT);
175 unsigned long ino = le32_to_cpu(de->inode);
177 page_cache_release(page);
178 inode = iget(dir->i_sb, ino);
181 CDEBUG(D_INODE, "No inode.\n");
183 return ERR_PTR(-EACCES);
186 d_add(dentry, inode);
195 * adds a file entry to the specified directory, using the same
196 * semantics as ext2_find_entry(). It returns NULL if it failed.
198 * NOTE!! The inode part of 'de' is left at 0 - which means you
199 * may not sleep between calling this and putting something into
200 * the entry, as someone else might have used it while you slept.
202 * returns a locked and held page upon success
206 /* We do this with a locked page: that's not necessary, since the semaphore
207 * on the inode protects this page as well.
209 static struct page *obdfs_add_entry (struct inode * dir,
210 const char * name, int namelen,
211 struct ext2_dir_entry_2 ** res_dir,
214 unsigned long offset;
215 unsigned short rec_len;
217 struct ext2_dir_entry_2 * de, * de1;
218 struct super_block * sb;
223 if (!dir || !dir->i_nlink) {
234 * Is this a busy deleted directory? Can't create new files if so
236 if (dir->i_size == 0)
243 page = obdfs_getpage(dir, 0, 0, LOCKED);
248 rec_len = EXT2_DIR_REC_LEN(namelen);
249 /* CDEBUG(D_INODE, "reclen: %d\n", rec_len); */
250 PDEBUG(page, "starting search");
252 de = (struct ext2_dir_entry_2 *) page_address(page);
256 "Entry at %p, (page at %#lx - %#lx), offset %ld\n",
257 de, page_address(page), page_address(page) + PAGE_SIZE,
259 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
261 page_cache_release(page);
262 page = obdfs_getpage(dir, offset, 1, LOCKED);
267 PDEBUG(page, "new directory page");
268 if (dir->i_size <= offset) {
269 if (dir->i_size == 0) {
275 CDEBUG(D_INODE, "creating next block\n");
277 de = (struct ext2_dir_entry_2 *) page_address(page);
279 de->rec_len = le16_to_cpu(PAGE_SIZE);
280 dir->i_size = offset + PAGE_SIZE;
281 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
282 mark_inode_dirty(dir);
285 ext2_debug ("skipping to next block\n");
287 de = (struct ext2_dir_entry_2 *) page_address(page);
290 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
294 page_cache_release(page);
298 CDEBUG(D_INODE, "\n");
299 if (ext2_match (namelen, name, de)) {
302 page_cache_release(page);
306 /* CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);*/
307 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
308 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
309 offset += le16_to_cpu(de->rec_len);
311 "Found enough space de %p, offset %#lx\n",
313 if (le32_to_cpu(de->inode)) {
314 /*CDEBUG(D_INODE, "Insert new in %p\n", de);*/
315 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
316 EXT2_DIR_REC_LEN(de->name_len));
317 /*CDEBUG(D_INODE, "-- de1 at %p\n", de1);*/
318 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
319 EXT2_DIR_REC_LEN(de->name_len));
320 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
324 "Reclen adjusted; copy %d bytes to %p, "
325 "page at %#lx EOP at %#lx\n",
326 namelen, de->name, page_address(page),
327 page_address(page) + PAGE_SIZE); */
329 de->name_len = namelen;
331 memcpy (de->name, name, namelen);
333 * XXX shouldn't update any times until successful
334 * completion of syscall, but too many callers depend
337 * XXX similarly, too many callers depend on
338 * ext2_new_inode() setting the times, but error
339 * recovery deletes the inode, so the worst that can
340 * happen is that the times are slightly out of date
341 * and/or different from the directory change time.
343 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
344 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
345 mark_inode_dirty(dir);
346 dir->i_version = ++event;
349 PDEBUG(page, "add_entry");
350 /* XXX unlock page here */
354 offset += le16_to_cpu(de->rec_len);
355 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
360 page_cache_release(page);
361 PDEBUG(page, "add_entry");
364 } /* obdfs_add_entry */
367 * obdfs_delete_entry deletes a directory entry by merging it with the
370 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
373 struct ext2_dir_entry_2 * de, * pde;
378 de = (struct ext2_dir_entry_2 *) page_address(page);
379 while (i < PAGE_SIZE) {
380 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
386 cpu_to_le16(le16_to_cpu(pde->rec_len) +
387 le16_to_cpu(dir->rec_len));
392 i += le16_to_cpu(de->rec_len);
394 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
397 } /* obdfs_delete_entry */
400 static inline void ext2_set_de_type(struct super_block *sb,
401 struct ext2_dir_entry_2 *de,
403 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
406 de->file_type = EXT2_FT_CHRDEV;
407 else if (S_ISBLK(mode))
408 de->file_type = EXT2_FT_BLKDEV;
409 else if (S_ISFIFO(mode))
410 de->file_type = EXT2_FT_FIFO;
411 else if (S_ISLNK(mode))
412 de->file_type = EXT2_FT_SYMLINK;
413 else if (S_ISREG(mode))
414 de->file_type = EXT2_FT_REG_FILE;
415 else if (S_ISDIR(mode))
416 de->file_type = EXT2_FT_DIR;
421 * Display all dentries holding the specified inode.
424 static void show_dentry(struct list_head * dlist, int subdirs)
426 struct list_head *tmp = dlist;
428 while ((tmp = tmp->next) != dlist) {
429 struct dentry * dentry;
430 const char * unhashed = "";
433 dentry = list_entry(tmp, struct dentry, d_child);
435 dentry = list_entry(tmp, struct dentry, d_alias);
437 if (list_empty(&dentry->d_hash))
438 unhashed = "(unhashed)";
440 if ( dentry->d_inode )
441 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
442 dentry->d_parent->d_name.name,
443 dentry->d_name.name, dentry->d_count,
444 unhashed, dentry->d_inode->i_ino,
445 dentry->d_inode->i_dev,
446 dentry->d_inode->i_count);
448 printk("show_dentry: %s/%s, d_count=%d%s \n",
449 dentry->d_parent->d_name.name,
450 dentry->d_name.name, dentry->d_count,
457 static struct inode *obdfs_new_inode(struct inode *dir, int mode)
467 return ERR_PTR(-ENOMEM);
470 /* Send a hint to the create method on the type of file to create */
472 oa->o_valid |= OBD_MD_FLMODE;
474 err = IOPS(dir, create)(IID(dir), oa);
482 inode = iget(dir->i_sb, (ino_t)oa->o_id);
485 IOPS(dir, destroy)(IID(dir), oa);
488 return ERR_PTR(-EIO);
491 if (!list_empty(&inode->i_dentry)) {
492 CDEBUG(D_INODE, "New inode (%ld) has aliases!\n", inode->i_ino);
493 IOPS(dir, destroy)(IID(dir), oa);
497 return ERR_PTR(-EIO);
503 } /* obdfs_new_inode */
507 * By the time this is called, we already have created
508 * the directory cache entry for the new file, but it
509 * is so far negative - it has no inode.
511 * If the create succeeds, we fill in the inode information
512 * with d_instantiate().
514 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
516 struct inode * inode;
518 struct ext2_dir_entry_2 * de;
522 inode = obdfs_new_inode(dir, mode);
523 if ( IS_ERR(inode) ) {
525 return PTR_ERR(inode);
528 inode->i_op = &obdfs_file_inode_operations;
529 mark_inode_dirty(inode);
530 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
533 mark_inode_dirty(inode);
538 de->inode = cpu_to_le32(inode->i_ino);
539 ext2_set_de_type(dir->i_sb, de, S_IFREG);
540 dir->i_version = ++event;
542 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
545 page_cache_release(page);
546 d_instantiate(dentry, inode);
551 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
553 struct inode * inode;
555 struct ext2_dir_entry_2 * de;
559 inode = obdfs_new_inode(dir, mode);
560 if ( IS_ERR(inode) ) {
562 return PTR_ERR(inode);
565 inode->i_uid = current->fsuid;
566 init_special_inode(inode, mode, rdev);
567 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
570 de->inode = cpu_to_le32(inode->i_ino);
571 dir->i_version = ++event;
572 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
573 mark_inode_dirty(inode);
575 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
578 d_instantiate(dentry, inode);
579 page_cache_release(page);
586 mark_inode_dirty(inode);
591 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
593 struct inode * inode;
594 struct page *page, *inode_page;
595 struct ext2_dir_entry_2 * de;
601 if (dir->i_nlink >= EXT2_LINK_MAX)
605 if (dir->i_mode & S_ISGID)
608 inode = obdfs_new_inode(dir, mode);
609 if ( IS_ERR(inode) ) {
611 return PTR_ERR(inode);
614 inode->i_op = &obdfs_dir_inode_operations;
616 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
618 inode->i_nlink--; /* is this nlink == 0? */
619 mark_inode_dirty(inode);
624 /* create . and .. */
625 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
626 de->inode = cpu_to_le32(inode->i_ino);
628 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
629 strcpy (de->name, ".");
630 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
632 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
633 de->inode = cpu_to_le32(dir->i_ino);
634 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
636 strcpy (de->name, "..");
637 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
640 err = obdfs_do_writepage(inode, inode_page, IS_SYNC(inode));
641 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
642 inode->i_size = PAGE_SIZE;
643 UnlockPage(inode_page);
644 page_cache_release(inode_page);
647 mark_inode_dirty(inode);
649 /* now deal with the parent */
650 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
655 de->inode = cpu_to_le32(inode->i_ino);
656 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
657 dir->i_version = ++event;
660 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
661 mark_inode_dirty(dir);
662 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
666 page_cache_release(page);
667 d_instantiate(dentry, inode);
674 mark_inode_dirty(inode);
682 * routine to check that the specified directory is empty (for rmdir)
684 static int empty_dir (struct inode * inode)
686 unsigned long offset;
688 struct ext2_dir_entry_2 * de, * de1;
689 struct super_block * sb;
692 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
693 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
694 ext2_warning (inode->i_sb, "empty_dir",
695 "bad directory (dir #%lu) - no data block",
699 de = (struct ext2_dir_entry_2 *) page_address(page);
700 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
701 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
702 strcmp (".", de->name) || strcmp ("..", de1->name)) {
703 ext2_warning (inode->i_sb, "empty_dir",
704 "bad directory (dir #%lu) - no `.' or `..'",
706 page_cache_release(page);
709 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
710 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
711 while (offset < inode->i_size ) {
712 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
715 page_cache_release(page);
717 page = obdfs_getpage(inode, offset, 0, LOCKED);
720 ext2_error (sb, "empty_dir",
721 "directory #%lu contains a hole at offset %lu",
722 inode->i_ino, offset);
724 offset += sb->s_blocksize;
727 de = (struct ext2_dir_entry_2 *) page_address(page);
729 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
732 page_cache_release(page);
735 if (le32_to_cpu(de->inode)) {
737 page_cache_release(page);
740 offset += le16_to_cpu(de->rec_len);
741 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
744 page_cache_release(page);
748 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
751 struct inode * inode;
753 struct ext2_dir_entry_2 * de;
759 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
763 inode = dentry->d_inode;
767 if (le32_to_cpu(de->inode) != inode->i_ino)
771 if (!empty_dir (inode))
774 retval = obdfs_delete_entry (de, page);
775 dir->i_version = ++event;
778 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
779 /* XXX handle err? */
782 if (inode->i_nlink != 2)
783 ext2_warning (inode->i_sb, "ext2_rmdir",
784 "empty directory has nlink!=2 (%d)",
786 inode->i_version = ++event;
789 mark_inode_dirty(inode);
791 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
792 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
793 mark_inode_dirty(dir);
798 page_cache_release(page);
803 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
806 struct inode * inode;
808 struct ext2_dir_entry_2 * de;
814 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
818 inode = dentry->d_inode;
822 if (le32_to_cpu(de->inode) != inode->i_ino)
825 if (!inode->i_nlink) {
826 ext2_warning (inode->i_sb, "ext2_unlink",
827 "Deleting nonexistent file (%lu), %d",
828 inode->i_ino, inode->i_nlink);
831 retval = obdfs_delete_entry (de, page);
834 dir->i_version = ++event;
835 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
836 /* XXX handle err? */
839 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
840 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
841 mark_inode_dirty(dir);
843 mark_inode_dirty(inode);
844 inode->i_ctime = dir->i_ctime;
846 d_delete(dentry); /* This also frees the inode */
850 page_cache_release(page);
855 int obdfs_symlink (struct inode * dir, struct dentry *dentry,
856 const char * symname)
858 struct ext2_dir_entry_2 * de;
859 struct inode * inode;
860 struct obdfs_inode_info *oinfo;
861 struct page* page = NULL, * name_page = NULL;
863 int i, l, err = -EIO;
867 inode = obdfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
868 if ( IS_ERR(inode) ) {
870 return PTR_ERR(inode);
873 inode->i_op = &obdfs_symlink_inode_operations;
874 for (l = 0; l < inode->i_sb->s_blocksize - 1 && symname [l]; l++)
877 oinfo = obdfs_i2info(inode);
879 if (l >= sizeof(oinfo->oi_inline)) {
880 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
882 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
885 mark_inode_dirty(inode);
890 link = (char *)page_address(name_page);
892 link = oinfo->oi_inline;
893 oinfo->oi_flags |= OBD_FL_INLINEDATA;
895 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
898 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
902 err = obdfs_do_writepage(inode, name_page, IS_SYNC(inode));
904 PDEBUG(name_page, "symlink");
905 UnlockPage(name_page);
906 page_cache_release(name_page);
909 mark_inode_dirty(inode);
911 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len,
915 de->inode = cpu_to_le32(inode->i_ino);
916 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
917 dir->i_version = ++event;
918 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
921 d_instantiate(dentry, inode);
928 mark_inode_dirty(inode);
931 } /* obdfs_symlink */
933 int obdfs_link (struct dentry * old_dentry,
934 struct inode * dir, struct dentry *dentry)
936 struct inode *inode = old_dentry->d_inode;
937 struct ext2_dir_entry_2 * de;
943 if (S_ISDIR(inode->i_mode))
946 if (inode->i_nlink >= EXT2_LINK_MAX)
949 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
953 de->inode = cpu_to_le32(inode->i_ino);
954 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
955 dir->i_version = ++event;
957 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
960 page_cache_release(page);
962 inode->i_ctime = CURRENT_TIME;
963 mark_inode_dirty(inode);
965 d_instantiate(dentry, inode);
969 #define PARENT_INO(buffer) \
970 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
971 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
974 * Anybody can rename anything with this: the permission checks are left to the
975 * higher-level routines.
977 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
978 struct inode * new_dir, struct dentry *new_dentry)
980 struct inode * old_inode, * new_inode;
981 struct page * old_page, * new_page, * dir_page;
982 struct ext2_dir_entry_2 * old_de, * new_de;
987 new_page = dir_page = NULL;
989 /* does the old entry exist? - if not get out */
990 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
991 PDEBUG(old_page, "rename - old page");
993 * Check for inode number is _not_ due to possible IO errors.
994 * We might rmdir the source, keep it as pwd of some process
995 * and merrily kill the link to whatever was created under the
996 * same name. Goodbye sticky bit ;-<
998 old_inode = old_dentry->d_inode;
1000 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
1003 /* find new inode */
1004 new_inode = new_dentry->d_inode;
1005 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
1006 new_dentry->d_name.len, &new_de, NOLOCK);
1007 PDEBUG(new_page, "rename - new page ");
1010 page_cache_release(new_page);
1013 DQUOT_INIT(new_inode);
1016 /* in this case we to check more ... */
1017 if (S_ISDIR(old_inode->i_mode)) {
1018 /* can only rename into empty new directory */
1021 if (!empty_dir (new_inode))
1025 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1026 PDEBUG(dir_page, "rename dir page");
1030 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1033 if (!new_inode && new_dir!=old_dir &&
1034 new_dir->i_nlink >= EXT2_LINK_MAX)
1037 /* create the target dir entry */
1039 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1040 new_dentry->d_name.len, &new_de,
1042 PDEBUG(new_page, "rename new page");
1046 new_dir->i_version = ++event;
1049 * remove the old entry
1051 new_de->inode = le32_to_cpu(old_inode->i_ino);
1052 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1053 EXT2_FEATURE_INCOMPAT_FILETYPE))
1054 new_de->file_type = old_de->file_type;
1056 obdfs_delete_entry (old_de, old_page);
1058 old_dir->i_version = ++event;
1060 new_inode->i_nlink--;
1061 new_inode->i_ctime = CURRENT_TIME;
1062 mark_inode_dirty(new_inode);
1064 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1065 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1066 mark_inode_dirty(old_dir);
1068 PARENT_INO(page_address(dir_page)) =le32_to_cpu(new_dir->i_ino);
1069 err = obdfs_do_writepage(old_inode, dir_page,
1070 IS_SYNC(old_inode));
1071 /* XXX handle err */
1073 mark_inode_dirty(old_dir);
1075 new_inode->i_nlink--;
1076 mark_inode_dirty(new_inode);
1079 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1080 mark_inode_dirty(new_dir);
1083 if ( old_page != new_page ) {
1084 unsigned long index = old_page->index;
1085 /* lock the old_page and release unlocked copy */
1086 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1087 page_cache_release(old_page);
1088 old_page = obdfs_getpage(old_dir, index << PAGE_SHIFT, 0,
1090 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1091 err = obdfs_do_writepage(old_dir, old_page, IS_SYNC(old_dir));
1092 /* XXX handle err */
1095 err = obdfs_do_writepage(new_dir, new_page, IS_SYNC(new_dir));
1098 if (old_page && PageLocked(old_page) )
1099 UnlockPage(old_page);
1101 page_cache_release(old_page);
1102 if (new_page && PageLocked(new_page) )
1103 UnlockPage(new_page);
1105 page_cache_release(new_page);
1106 if (dir_page && PageLocked(dir_page) )
1107 UnlockPage(dir_page);
1109 page_cache_release(dir_page);
1112 } /* obdfs_rename */