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 on the inode protects this page as well. */
207 static struct page *obdfs_add_entry (struct inode * dir,
208 const char * name, int namelen,
209 struct ext2_dir_entry_2 ** res_dir,
212 unsigned long offset;
213 unsigned short rec_len;
215 struct ext2_dir_entry_2 * de, * de1;
216 struct super_block * sb;
221 if (!dir || !dir->i_nlink) {
232 * Is this a busy deleted directory? Can't create new files if so
234 if (dir->i_size == 0)
241 page = obdfs_getpage(dir, 0, 0, LOCKED);
246 rec_len = EXT2_DIR_REC_LEN(namelen);
247 /* CDEBUG(D_INODE, "reclen: %d\n", rec_len); */
248 PDEBUG(page, "starting search");
250 de = (struct ext2_dir_entry_2 *) page_address(page);
254 "Entry at %p, (page at %#lx - %#lx), offset %ld\n",
255 de, page_address(page), page_address(page) + PAGE_SIZE,
257 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
259 page_cache_release(page);
260 page = obdfs_getpage(dir, offset, 1, LOCKED);
265 PDEBUG(page, "new directory page");
266 if (dir->i_size <= offset) {
267 if (dir->i_size == 0) {
273 CDEBUG(D_INODE, "creating next block\n");
275 de = (struct ext2_dir_entry_2 *) page_address(page);
277 de->rec_len = le16_to_cpu(PAGE_SIZE);
278 dir->i_size = offset + PAGE_SIZE;
279 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
280 mark_inode_dirty(dir);
283 ext2_debug ("skipping to next block\n");
285 de = (struct ext2_dir_entry_2 *) page_address(page);
288 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
292 page_cache_release(page);
296 CDEBUG(D_INODE, "\n");
297 if (ext2_match (namelen, name, de)) {
300 page_cache_release(page);
304 /* CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);*/
305 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
306 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
307 offset += le16_to_cpu(de->rec_len);
309 "Found enough space de %p, offset %#lx\n",
311 if (le32_to_cpu(de->inode)) {
312 /*CDEBUG(D_INODE, "Insert new in %p\n", de);*/
313 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
314 EXT2_DIR_REC_LEN(de->name_len));
315 /*CDEBUG(D_INODE, "-- de1 at %p\n", de1);*/
316 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
317 EXT2_DIR_REC_LEN(de->name_len));
318 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
322 "Reclen adjusted; copy %d bytes to %p, "
323 "page at %#lx EOP at %#lx\n",
324 namelen, de->name, page_address(page),
325 page_address(page) + PAGE_SIZE); */
327 de->name_len = namelen;
329 memcpy (de->name, name, namelen);
331 * XXX shouldn't update any times until successful
332 * completion of syscall, but too many callers depend
335 * XXX similarly, too many callers depend on
336 * ext2_new_inode() setting the times, but error
337 * recovery deletes the inode, so the worst that can
338 * happen is that the times are slightly out of date
339 * and/or different from the directory change time.
341 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
342 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
343 mark_inode_dirty(dir);
344 dir->i_version = ++event;
347 PDEBUG(page, "add_entry");
348 /* XXX unlock page here */
352 offset += le16_to_cpu(de->rec_len);
353 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
358 page_cache_release(page);
359 PDEBUG(page, "add_entry");
362 } /* obdfs_add_entry */
365 * obdfs_delete_entry deletes a directory entry by merging it with the
368 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
371 struct ext2_dir_entry_2 * de, * pde;
376 de = (struct ext2_dir_entry_2 *) page_address(page);
377 while (i < PAGE_SIZE) {
378 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
384 cpu_to_le16(le16_to_cpu(pde->rec_len) +
385 le16_to_cpu(dir->rec_len));
390 i += le16_to_cpu(de->rec_len);
392 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
395 } /* obdfs_delete_entry */
398 static inline void ext2_set_de_type(struct super_block *sb,
399 struct ext2_dir_entry_2 *de,
401 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
404 de->file_type = EXT2_FT_CHRDEV;
405 else if (S_ISBLK(mode))
406 de->file_type = EXT2_FT_BLKDEV;
407 else if (S_ISFIFO(mode))
408 de->file_type = EXT2_FT_FIFO;
409 else if (S_ISLNK(mode))
410 de->file_type = EXT2_FT_SYMLINK;
411 else if (S_ISREG(mode))
412 de->file_type = EXT2_FT_REG_FILE;
413 else if (S_ISDIR(mode))
414 de->file_type = EXT2_FT_DIR;
419 * Display all dentries holding the specified inode.
422 static void show_dentry(struct list_head * dlist, int subdirs)
424 struct list_head *tmp = dlist;
426 while ((tmp = tmp->next) != dlist) {
427 struct dentry * dentry;
428 const char * unhashed = "";
431 dentry = list_entry(tmp, struct dentry, d_child);
433 dentry = list_entry(tmp, struct dentry, d_alias);
435 if (list_empty(&dentry->d_hash))
436 unhashed = "(unhashed)";
438 if ( dentry->d_inode )
439 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
440 dentry->d_parent->d_name.name,
441 dentry->d_name.name, dentry->d_count,
442 unhashed, dentry->d_inode->i_ino,
443 dentry->d_inode->i_dev,
444 dentry->d_inode->i_count);
446 printk("show_dentry: %s/%s, d_count=%d%s \n",
447 dentry->d_parent->d_name.name,
448 dentry->d_name.name, dentry->d_count,
455 static struct inode *obdfs_new_inode(struct inode *dir, int mode)
465 return ERR_PTR(-ENOMEM);
468 /* Send a hint to the create method on the type of file to create */
470 oa->o_valid |= OBD_MD_FLMODE;
472 err = IOPS(dir, create)(IID(dir), oa);
480 inode = iget(dir->i_sb, (ino_t)oa->o_id);
483 IOPS(dir, destroy)(IID(dir), oa);
486 return ERR_PTR(-EIO);
489 if (!list_empty(&inode->i_dentry)) {
490 CDEBUG(D_INODE, "New inode (%ld) has aliases!\n", inode->i_ino);
491 IOPS(dir, destroy)(IID(dir), oa);
495 return ERR_PTR(-EIO);
501 } /* obdfs_new_inode */
505 * By the time this is called, we already have created
506 * the directory cache entry for the new file, but it
507 * is so far negative - it has no inode.
509 * If the create succeeds, we fill in the inode information
510 * with d_instantiate().
512 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
514 struct inode * inode;
516 struct ext2_dir_entry_2 * de;
520 inode = obdfs_new_inode(dir, mode);
521 if ( IS_ERR(inode) ) {
523 return PTR_ERR(inode);
526 inode->i_op = &obdfs_file_inode_operations;
527 mark_inode_dirty(inode);
528 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
531 mark_inode_dirty(inode);
536 de->inode = cpu_to_le32(inode->i_ino);
537 ext2_set_de_type(dir->i_sb, de, S_IFREG);
538 dir->i_version = ++event;
540 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
543 page_cache_release(page);
544 d_instantiate(dentry, inode);
549 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
551 struct inode * inode;
553 struct ext2_dir_entry_2 * de;
557 inode = obdfs_new_inode(dir, mode);
558 if ( IS_ERR(inode) ) {
560 return PTR_ERR(inode);
563 inode->i_uid = current->fsuid;
564 init_special_inode(inode, mode, rdev);
565 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
568 de->inode = cpu_to_le32(inode->i_ino);
569 dir->i_version = ++event;
570 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
571 mark_inode_dirty(inode);
573 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
576 d_instantiate(dentry, inode);
577 page_cache_release(page);
584 mark_inode_dirty(inode);
589 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
591 struct inode * inode;
592 struct page *page, *inode_page;
593 struct ext2_dir_entry_2 * de;
599 if (dir->i_nlink >= EXT2_LINK_MAX)
603 if (dir->i_mode & S_ISGID)
606 inode = obdfs_new_inode(dir, mode);
607 if ( IS_ERR(inode) ) {
609 return PTR_ERR(inode);
612 inode->i_op = &obdfs_dir_inode_operations;
614 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
616 inode->i_nlink--; /* is this nlink == 0? */
617 mark_inode_dirty(inode);
622 /* create . and .. */
623 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
624 de->inode = cpu_to_le32(inode->i_ino);
626 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
627 strcpy (de->name, ".");
628 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
630 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
631 de->inode = cpu_to_le32(dir->i_ino);
632 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
634 strcpy (de->name, "..");
635 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
638 err = obdfs_do_writepage(inode, inode_page, IS_SYNC(inode));
639 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
640 inode->i_size = PAGE_SIZE;
641 UnlockPage(inode_page);
642 page_cache_release(inode_page);
645 mark_inode_dirty(inode);
647 /* now deal with the parent */
648 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
653 de->inode = cpu_to_le32(inode->i_ino);
654 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
655 dir->i_version = ++event;
658 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
659 mark_inode_dirty(dir);
660 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
664 page_cache_release(page);
665 d_instantiate(dentry, inode);
672 mark_inode_dirty(inode);
680 * routine to check that the specified directory is empty (for rmdir)
682 static int empty_dir (struct inode * inode)
684 unsigned long offset;
686 struct ext2_dir_entry_2 * de, * de1;
687 struct super_block * sb;
690 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
691 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
692 ext2_warning (inode->i_sb, "empty_dir",
693 "bad directory (dir #%lu) - no data block",
697 de = (struct ext2_dir_entry_2 *) page_address(page);
698 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
699 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
700 strcmp (".", de->name) || strcmp ("..", de1->name)) {
701 ext2_warning (inode->i_sb, "empty_dir",
702 "bad directory (dir #%lu) - no `.' or `..'",
704 page_cache_release(page);
707 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
708 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
709 while (offset < inode->i_size ) {
710 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
713 page_cache_release(page);
715 page = obdfs_getpage(inode, offset, 0, LOCKED);
718 ext2_error (sb, "empty_dir",
719 "directory #%lu contains a hole at offset %lu",
720 inode->i_ino, offset);
722 offset += sb->s_blocksize;
725 de = (struct ext2_dir_entry_2 *) page_address(page);
727 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
730 page_cache_release(page);
733 if (le32_to_cpu(de->inode)) {
735 page_cache_release(page);
738 offset += le16_to_cpu(de->rec_len);
739 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
742 page_cache_release(page);
746 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
749 struct inode * inode;
751 struct ext2_dir_entry_2 * de;
757 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
761 inode = dentry->d_inode;
765 if (le32_to_cpu(de->inode) != inode->i_ino)
769 if (!empty_dir (inode))
772 retval = obdfs_delete_entry (de, page);
773 dir->i_version = ++event;
776 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
777 /* XXX handle err? */
780 if (inode->i_nlink != 2)
781 ext2_warning (inode->i_sb, "ext2_rmdir",
782 "empty directory has nlink!=2 (%d)",
784 inode->i_version = ++event;
787 mark_inode_dirty(inode);
789 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
790 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
791 mark_inode_dirty(dir);
796 page_cache_release(page);
801 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
804 struct inode * inode;
806 struct ext2_dir_entry_2 * de;
812 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
816 inode = dentry->d_inode;
820 if (le32_to_cpu(de->inode) != inode->i_ino)
823 if (!inode->i_nlink) {
824 ext2_warning (inode->i_sb, "ext2_unlink",
825 "Deleting nonexistent file (%lu), %d",
826 inode->i_ino, inode->i_nlink);
829 retval = obdfs_delete_entry (de, page);
832 dir->i_version = ++event;
833 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
834 /* XXX handle err? */
837 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
838 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
839 mark_inode_dirty(dir);
841 mark_inode_dirty(inode);
842 inode->i_ctime = dir->i_ctime;
844 d_delete(dentry); /* This also frees the inode */
848 page_cache_release(page);
853 int obdfs_symlink (struct inode * dir, struct dentry *dentry,
854 const char * symname)
856 struct ext2_dir_entry_2 * de;
857 struct inode * inode;
858 struct obdfs_inode_info *oinfo;
859 struct page* page = NULL, * name_page = NULL;
861 int i, l, err = -EIO;
865 inode = obdfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
866 if ( IS_ERR(inode) ) {
868 return PTR_ERR(inode);
871 inode->i_op = &obdfs_symlink_inode_operations;
872 for (l = 0; l < inode->i_sb->s_blocksize - 1 && symname [l]; l++)
875 oinfo = OBDFS_INFO(inode);
877 if (l >= sizeof(oinfo->oi_inline)) {
878 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
880 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
883 mark_inode_dirty(inode);
888 link = (char *)page_address(name_page);
890 link = oinfo->oi_inline;
891 oinfo->oi_flags |= OBD_FL_INLINEDATA;
893 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
896 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
900 err = obdfs_do_writepage(inode, name_page, IS_SYNC(inode));
902 PDEBUG(name_page, "symlink");
903 UnlockPage(name_page);
904 page_cache_release(name_page);
907 mark_inode_dirty(inode);
909 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len,
913 de->inode = cpu_to_le32(inode->i_ino);
914 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
915 dir->i_version = ++event;
916 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
919 d_instantiate(dentry, inode);
926 mark_inode_dirty(inode);
929 } /* obdfs_symlink */
931 int obdfs_link (struct dentry * old_dentry,
932 struct inode * dir, struct dentry *dentry)
934 struct inode *inode = old_dentry->d_inode;
935 struct ext2_dir_entry_2 * de;
941 if (S_ISDIR(inode->i_mode))
944 if (inode->i_nlink >= EXT2_LINK_MAX)
947 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
951 de->inode = cpu_to_le32(inode->i_ino);
952 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
953 dir->i_version = ++event;
955 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
958 page_cache_release(page);
960 inode->i_ctime = CURRENT_TIME;
961 mark_inode_dirty(inode);
963 d_instantiate(dentry, inode);
967 #define PARENT_INO(buffer) \
968 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
969 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
972 * Anybody can rename anything with this: the permission checks are left to the
973 * higher-level routines.
975 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
976 struct inode * new_dir, struct dentry *new_dentry)
978 struct inode * old_inode, * new_inode;
979 struct page * old_page, * new_page, * dir_page;
980 struct ext2_dir_entry_2 * old_de, * new_de;
985 new_page = dir_page = NULL;
987 /* does the old entry exist? - if not get out */
988 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
989 PDEBUG(old_page, "rename - old page");
991 * Check for inode number is _not_ due to possible IO errors.
992 * We might rmdir the source, keep it as pwd of some process
993 * and merrily kill the link to whatever was created under the
994 * same name. Goodbye sticky bit ;-<
996 old_inode = old_dentry->d_inode;
998 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
1001 /* find new inode */
1002 new_inode = new_dentry->d_inode;
1003 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
1004 new_dentry->d_name.len, &new_de, NOLOCK);
1005 PDEBUG(new_page, "rename - new page ");
1008 page_cache_release(new_page);
1011 DQUOT_INIT(new_inode);
1014 /* in this case we to check more ... */
1015 if (S_ISDIR(old_inode->i_mode)) {
1016 /* can only rename into empty new directory */
1019 if (!empty_dir (new_inode))
1023 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1024 PDEBUG(dir_page, "rename dir page");
1028 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1031 if (!new_inode && new_dir!=old_dir &&
1032 new_dir->i_nlink >= EXT2_LINK_MAX)
1035 /* create the target dir entry */
1037 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1038 new_dentry->d_name.len, &new_de,
1040 PDEBUG(new_page, "rename new page");
1044 new_dir->i_version = ++event;
1047 * remove the old entry
1049 new_de->inode = le32_to_cpu(old_inode->i_ino);
1050 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1051 EXT2_FEATURE_INCOMPAT_FILETYPE))
1052 new_de->file_type = old_de->file_type;
1054 obdfs_delete_entry (old_de, old_page);
1056 old_dir->i_version = ++event;
1058 new_inode->i_nlink--;
1059 new_inode->i_ctime = CURRENT_TIME;
1060 mark_inode_dirty(new_inode);
1062 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1063 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1064 mark_inode_dirty(old_dir);
1066 PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
1067 /* XXX handle err */
1068 err = obdfs_do_writepage(old_inode, dir_page, IS_SYNC(old_inode));
1070 mark_inode_dirty(old_dir);
1072 new_inode->i_nlink--;
1073 mark_inode_dirty(new_inode);
1076 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1077 mark_inode_dirty(new_dir);
1080 if ( old_page != new_page ) {
1081 unsigned long index = old_page->index;
1082 /* lock the old_page and release unlocked copy */
1083 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1084 page_cache_release(old_page);
1085 old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
1086 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1087 /* XXX handle err */
1088 err = obdfs_do_writepage(old_dir, old_page, IS_SYNC(old_dir));
1091 err = obdfs_do_writepage(new_dir, new_page, IS_SYNC(new_dir));
1094 if (old_page && PageLocked(old_page) )
1095 UnlockPage(old_page);
1097 page_cache_release(old_page);
1098 if (new_page && PageLocked(new_page) )
1099 UnlockPage(new_page);
1101 page_cache_release(new_page);
1102 if (dir_page && PageLocked(dir_page) )
1103 UnlockPage(dir_page);
1105 page_cache_release(dir_page);
1109 } /* obdfs_rename */