2 * linux/fs/obdfs/namei.c
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copyright (C) 1992, 1993, 1994, 1995
8 * Remy Card (card@masi.ibp.fr)
9 * Laboratoire MASI - Institut Blaise Pascal
10 * Universite Pierre et Marie Curie (Paris VI)
14 * linux/fs/ext2/namei.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
18 * Big-endian to little-endian byte-swapping/bitmaps by
19 * David S. Miller (davem@caip.rutgers.edu), 1995
20 * Directory entry file type support and forward compatibility hooks
21 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
23 * Changes for use in OBDFS
24 * Copyright (c) 1999, Seagate Technology Inc.
29 #include <linux/locks.h>
30 #include <linux/quotaops.h>
31 #include <linux/obd_support.h>
32 #include <linux/obdfs.h>
36 * define how far ahead to read directories while searching them.
38 #define NAMEI_RA_CHUNKS 2
39 #define NAMEI_RA_BLOCKS 4
40 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
41 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
46 * NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
48 * `len <= EXT2_NAME_LEN' is guaranteed by caller.
49 * `de != NULL' is guaranteed by caller.
51 static inline int ext2_match (int len, const char * const name,
52 struct ext2_dir_entry_2 * de)
54 if (len != de->name_len)
58 return !memcmp(name, de->name, len);
64 * finds an entry in the specified directory with the wanted name. It
65 * returns the cache buffer in which the entry was found, and the entry
66 * itself (as a parameter - res_dir). It does NOT read the inode of the
67 * entry - you'll have to do that yourself if you want to.
69 static struct page * obdfs_find_entry (struct inode * dir,
70 const char * const name, int namelen,
71 struct ext2_dir_entry_2 ** res_dir,
74 struct super_block * sb;
79 CDEBUG(D_INFO, "find entry for %*s\n", namelen, name);
84 if (namelen > EXT2_NAME_LEN)
87 CDEBUG(D_INFO, "dirsize is %Ld\n", dir->i_size);
91 while ( offset < dir->i_size ) {
92 struct ext2_dir_entry_2 * de;
95 page = obdfs_getpage(dir, offset, 0, lock);
98 CDEBUG(D_INFO, "No page, offset %lx\n", offset);
102 de = (struct ext2_dir_entry_2 *) page_address(page);
103 dlimit = (char *)page_address(page) + PAGE_SIZE;
104 while ((char *) de < dlimit) {
105 /* this code is executed quadratically often */
106 /* do minimal checking `by hand' */
108 /* CDEBUG(D_INFO, "Entry %p len %d, page at %#lx - %#lx , offset %lx\n",
109 de, le16_to_cpu(de->rec_len), page_address(page),
110 page_address(page) + PAGE_SIZE, offset); */
112 if ((char *) de + namelen <= dlimit &&
113 ext2_match (namelen, name, de)) {
115 just to be sure, do a full check */
116 if (!obdfs_check_dir_entry("ext2_find_entry",
117 dir, de, page, offset))
123 /* prevent looping on a bad block */
124 de_len = le16_to_cpu(de->rec_len);
126 printk("Bad entry at %p len %d\n", de, de_len);
130 de = (struct ext2_dir_entry_2 *)
131 ((char *) de + de_len);
132 /* CDEBUG(D_INFO, "Next while %lx\n", offset); */
134 obd_unlock_page(page);
135 page_cache_release(page);
137 CDEBUG(D_INFO, "Next for %lx\n", offset);
141 CDEBUG(D_INFO, "Negative case, page %p, offset %ld\n", page, offset);
143 obd_unlock_page(page);
144 page_cache_release(page);
148 } /* obdfs_find_entry */
150 struct dentry *obdfs_lookup(struct inode *dir, struct dentry *dentry)
152 struct inode * inode;
153 struct ext2_dir_entry_2 * de;
157 if (dentry->d_name.len > EXT2_NAME_LEN)
158 return ERR_PTR(-ENAMETOOLONG);
160 page = obdfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
164 CDEBUG(D_INFO, "No page - negative entry.\n");
166 CDEBUG(D_INODE, "Danger: PAGE but de.\n");
167 return ERR_PTR(-ENOENT);
170 unsigned long ino = le32_to_cpu(de->inode);
171 page_cache_release(page);
172 obd_unlock_page(page);
173 inode = iget(dir->i_sb, ino);
176 CDEBUG(D_INODE, "No inode.\n");
178 return ERR_PTR(-EACCES);
181 d_add(dentry, inode);
189 * adds a file entry to the specified directory, using the same
190 * semantics as ext2_find_entry(). It returns NULL if it failed.
192 * NOTE!! The inode part of 'de' is left at 0 - which means you
193 * may not sleep between calling this and putting something into
194 * the entry, as someone else might have used it while you slept.
196 * returns a locked and held page upon success
200 /* We do this with a locked page: that's not necessary, since the semaphore
201 * on the inode protects this page as well.
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) {
218 CDEBUG(D_INODE, "bad directory\n");
225 CDEBUG(D_INODE, "bad directory\n");
230 * Is this a busy deleted directory? Can't create new files if so
232 if (dir->i_size == 0)
239 page = obdfs_getpage(dir, 0, 0, LOCKED);
244 rec_len = EXT2_DIR_REC_LEN(namelen);
245 /* CDEBUG(D_INFO, "reclen: %d\n", rec_len); */
246 /* PDEBUG(page, "starting search"); */
248 de = (struct ext2_dir_entry_2 *) page_address(page);
252 "Entry at %p, (page at %#lx - %#lx), offset %ld\n",
253 de, page_address(page), page_address(page) + PAGE_SIZE,
255 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
256 obd_unlock_page(page);
257 page_cache_release(page);
258 page = obdfs_getpage(dir, offset, 1, LOCKED);
263 /* PDEBUG(page, "new directory page"); */
264 if (dir->i_size <= offset) {
265 if (dir->i_size == 0) {
271 CDEBUG(D_INFO, "creating next block\n");
273 de = (struct ext2_dir_entry_2 *) page_address(page);
275 de->rec_len = cpu_to_le16(PAGE_SIZE);
276 dir->i_size = offset + PAGE_SIZE;
277 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
278 mark_inode_dirty(dir);
281 CDEBUG(D_INFO, "skipping to next block\n");
283 de = (struct ext2_dir_entry_2 *) page_address(page);
286 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
289 obd_unlock_page(page);
290 page_cache_release(page);
294 CDEBUG(D_INFO, "\n");
295 if (ext2_match (namelen, name, de)) {
297 obd_unlock_page(page);
298 page_cache_release(page);
302 /* CDEBUG(D_INFO, "Testing for enough space at de %p\n", de);*/
303 if ((le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
304 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
305 offset += le16_to_cpu(de->rec_len);
307 "Found enough space de %p, offset %#lx\n",
309 if (le32_to_cpu(de->inode)) {
310 /*CDEBUG(D_INFO, "Insert new in %p\n", de);*/
311 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
312 EXT2_DIR_REC_LEN(de->name_len));
313 /*CDEBUG(D_INFO, "-- de1 at %p\n", de1);*/
314 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
315 EXT2_DIR_REC_LEN(de->name_len));
316 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
320 "Reclen adjusted; copy %d bytes to %p, "
321 "page at %#lx EOP at %#lx\n",
322 namelen, de->name, page_address(page),
323 page_address(page) + PAGE_SIZE); */
325 de->name_len = namelen;
327 memcpy (de->name, name, namelen);
329 * XXX shouldn't update any times until successful
330 * completion of syscall, but too many callers depend
333 * XXX similarly, too many callers depend on
334 * ext2_new_inode() setting the times, but error
335 * recovery deletes the inode, so the worst that can
336 * happen is that the times are slightly out of date
337 * and/or different from the directory change time.
339 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
340 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
341 mark_inode_dirty(dir);
342 dir->i_version = ++event;
345 PDEBUG(page, "add_entry");
346 /* XXX unlock page here */
350 offset += le16_to_cpu(de->rec_len);
351 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
354 obd_unlock_page(page);
355 page_cache_release(page);
356 /* PDEBUG(page, "add_entry"); */
359 } /* obdfs_add_entry */
362 * obdfs_delete_entry deletes a directory entry by merging it with the
365 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
368 struct ext2_dir_entry_2 * de, * pde;
373 de = (struct ext2_dir_entry_2 *) page_address(page);
374 while (i < PAGE_SIZE) {
375 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
381 cpu_to_le16(le16_to_cpu(pde->rec_len) +
382 le16_to_cpu(dir->rec_len));
387 i += le16_to_cpu(de->rec_len);
389 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
392 } /* obdfs_delete_entry */
395 static inline void ext2_set_de_type(struct super_block *sb,
396 struct ext2_dir_entry_2 *de,
399 /* XXX fix this to check for obdfs feature, not ext2 feature */
400 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
403 de->file_type = EXT2_FT_REG_FILE;
404 else if (S_ISDIR(mode))
405 de->file_type = EXT2_FT_DIR;
406 else if (S_ISLNK(mode))
407 de->file_type = EXT2_FT_SYMLINK;
408 else if (S_ISSOCK(mode))
409 de->file_type = EXT2_FT_SOCK;
410 else if (S_ISFIFO(mode))
411 de->file_type = EXT2_FT_FIFO;
412 else if (S_ISCHR(mode))
413 de->file_type = EXT2_FT_CHRDEV;
414 else if (S_ISBLK(mode))
415 de->file_type = EXT2_FT_BLKDEV;
420 * Display all dentries holding the specified inode.
423 static void show_dentry(struct list_head * dlist, int subdirs)
425 struct list_head *tmp = dlist;
427 while ((tmp = tmp->next) != dlist) {
428 struct dentry * dentry;
429 const char * unhashed = "";
432 dentry = list_entry(tmp, struct dentry, d_child);
434 dentry = list_entry(tmp, struct dentry, d_alias);
436 if (list_empty(&dentry->d_hash))
437 unhashed = "(unhashed)";
439 if ( dentry->d_inode )
440 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
441 dentry->d_parent->d_name.name,
442 dentry->d_name.name, dentry->d_count,
443 unhashed, dentry->d_inode->i_ino,
444 dentry->d_inode->i_dev,
445 dentry->d_inode->i_count);
447 printk("show_dentry: %s/%s, d_count=%d%s \n",
448 dentry->d_parent->d_name.name,
449 dentry->d_name.name, dentry->d_count,
456 static struct inode *obdfs_new_inode(struct inode *dir, int mode)
463 if (IOPS(dir, create) == NULL) {
464 printk(KERN_ERR __FUNCTION__ ": no create method!\n");
466 return ERR_PTR(-EIO);
471 return ERR_PTR(-ENOMEM);
474 /* Send a hint to the create method on the type of file to create */
476 oa->o_valid |= OBD_MD_FLMODE;
478 err = IOPS(dir, create)(IID(dir), oa);
481 CDEBUG(D_INODE, "fatal: creating new inode (err %d)\n", err);
487 inode = iget(dir->i_sb, (ino_t)oa->o_id);
490 CDEBUG(D_INODE, "fatal: get new inode %ld\n", (long)oa->o_id);
491 IOPS(dir, destroy)(IID(dir), oa);
494 return ERR_PTR(-EIO);
497 if (!list_empty(&inode->i_dentry)) {
498 CDEBUG(D_INODE, "New inode (%ld) has aliases!\n", inode->i_ino);
499 IOPS(dir, destroy)(IID(dir), oa);
503 return ERR_PTR(-EIO);
509 } /* obdfs_new_inode */
513 * By the time this is called, we already have created
514 * the directory cache entry for the new file, but it
515 * is so far negative - it has no inode.
517 * If the create succeeds, we fill in the inode information
518 * with d_instantiate().
520 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
522 struct inode * inode;
524 struct ext2_dir_entry_2 * de;
528 inode = obdfs_new_inode(dir, mode);
529 if ( IS_ERR(inode) ) {
531 return PTR_ERR(inode);
534 inode->i_op = &obdfs_file_inode_operations;
535 mark_inode_dirty(inode);
536 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
539 mark_inode_dirty(inode);
544 de->inode = cpu_to_le32(inode->i_ino);
545 ext2_set_de_type(dir->i_sb, de, S_IFREG);
546 dir->i_version = ++event;
548 err = obdfs_do_writepage(page, IS_SYNC(dir));
549 obd_unlock_page(page);
550 page_cache_release(page);
551 d_instantiate(dentry, inode);
556 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
558 struct inode * inode;
560 struct ext2_dir_entry_2 * de;
561 struct obdfs_inode_info *oinfo;
565 inode = obdfs_new_inode(dir, mode);
566 if ( IS_ERR(inode) ) {
568 return PTR_ERR(inode);
571 inode->i_uid = current->fsuid;
572 init_special_inode(inode, mode, rdev);
573 oinfo = obdfs_i2info(inode);
574 ((obd_count *)oinfo->oi_inline)[0] = rdev;
575 oinfo->oi_flags |= OBD_FL_INLINEDATA;
577 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
580 de->inode = cpu_to_le32(inode->i_ino);
581 dir->i_version = ++event;
582 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
583 mark_inode_dirty(inode);
585 err = obdfs_do_writepage(page, IS_SYNC(dir));
586 obd_unlock_page(page);
588 d_instantiate(dentry, inode);
589 page_cache_release(page);
596 mark_inode_dirty(inode);
601 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
603 struct inode * inode;
604 struct page *page, *inode_page;
605 struct ext2_dir_entry_2 * de;
611 if (dir->i_nlink >= EXT2_LINK_MAX)
615 if (dir->i_mode & S_ISGID)
618 inode = obdfs_new_inode(dir, mode);
619 if ( IS_ERR(inode) ) {
621 return PTR_ERR(inode);
624 inode->i_op = &obdfs_dir_inode_operations;
626 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
628 inode->i_nlink--; /* is this nlink == 0? */
629 mark_inode_dirty(inode);
633 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
635 /* create . and .. */
636 de->inode = cpu_to_le32(inode->i_ino);
638 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
639 strcpy (de->name, ".");
640 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
641 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
642 de->inode = cpu_to_le32(dir->i_ino);
643 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
645 strcpy (de->name, "..");
646 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
649 err = obdfs_do_writepage(inode_page, IS_SYNC(inode));
650 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
651 inode->i_size = PAGE_SIZE;
652 obd_unlock_page(inode_page);
653 page_cache_release(inode_page);
654 mark_inode_dirty(inode);
660 /* now deal with the parent */
661 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
667 de->inode = cpu_to_le32(inode->i_ino);
668 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
669 dir->i_version = ++event;
672 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
673 mark_inode_dirty(dir);
674 err = obdfs_do_writepage(page, IS_SYNC(dir));
676 obd_unlock_page(page);
678 page_cache_release(page);
679 d_instantiate(dentry, inode);
686 mark_inode_dirty(inode);
693 * routine to check that the specified directory is empty (for rmdir)
695 static int empty_dir (struct inode * inode)
697 unsigned long offset;
699 struct ext2_dir_entry_2 * de, * de1;
700 struct super_block * sb;
703 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
704 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
705 ext2_warning (inode->i_sb, "empty_dir",
706 "bad directory (dir #%lu) - no data block",
710 de = (struct ext2_dir_entry_2 *) page_address(page);
711 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
712 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
713 strcmp (".", de->name) || strcmp ("..", de1->name)) {
714 ext2_warning (inode->i_sb, "empty_dir",
715 "bad directory (dir #%lu) - no `.' or `..'",
717 page_cache_release(page);
720 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
721 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
722 while (offset < inode->i_size ) {
723 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
725 obd_unlock_page(page);
726 page_cache_release(page);
728 page = obdfs_getpage(inode, offset, 0, LOCKED);
731 ext2_error (sb, "empty_dir",
732 "directory #%lu contains a hole at offset %lu",
733 inode->i_ino, offset);
735 offset += sb->s_blocksize;
738 de = (struct ext2_dir_entry_2 *) page_address(page);
740 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
742 obd_unlock_page(page);
743 page_cache_release(page);
746 if (le32_to_cpu(de->inode)) {
747 obd_unlock_page(page);
748 page_cache_release(page);
751 offset += le16_to_cpu(de->rec_len);
752 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
754 obd_unlock_page(page);
755 page_cache_release(page);
759 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
762 struct inode * inode;
764 struct ext2_dir_entry_2 * de;
769 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
773 inode = dentry->d_inode;
777 if (le32_to_cpu(de->inode) != inode->i_ino)
781 if (!empty_dir (inode))
784 retval = obdfs_delete_entry (de, page);
785 dir->i_version = ++event;
788 retval = obdfs_do_writepage(page, IS_SYNC(dir));
789 /* XXX handle err? */
790 obd_unlock_page(page);
792 if (inode->i_nlink != 2)
793 ext2_warning (inode->i_sb, "ext2_rmdir",
794 "empty directory has nlink!=2 (%d)",
796 inode->i_version = ++event;
799 mark_inode_dirty(inode);
801 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
802 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
803 mark_inode_dirty(dir);
808 page_cache_release(page);
813 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
816 struct inode * inode;
818 struct ext2_dir_entry_2 * de;
823 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
827 inode = dentry->d_inode;
831 if (le32_to_cpu(de->inode) != inode->i_ino)
834 if (!inode->i_nlink) {
835 ext2_warning (inode->i_sb, "ext2_unlink",
836 "Deleting nonexistent file (%lu), %d",
837 inode->i_ino, inode->i_nlink);
840 retval = obdfs_delete_entry (de, page);
843 dir->i_version = ++event;
844 retval = obdfs_do_writepage(page, IS_SYNC(dir));
845 /* XXX handle err? */
846 obd_unlock_page(page);
848 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
849 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
850 mark_inode_dirty(dir);
852 mark_inode_dirty(inode);
853 inode->i_ctime = dir->i_ctime;
854 d_delete(dentry); /* This also frees the inode */
858 page_cache_release(page);
863 int obdfs_symlink (struct inode * dir, struct dentry *dentry,
864 const char * symname)
866 struct inode * inode;
867 struct ext2_dir_entry_2 * de;
868 struct obdfs_inode_info *oinfo;
869 struct page* page = NULL, * name_page = NULL;
875 l = strlen(symname)+1;
881 inode = obdfs_new_inode(dir, S_IFLNK);
882 if ( IS_ERR(inode) ) {
887 inode->i_mode = S_IFLNK | S_IRWXUGO;
888 oinfo = obdfs_i2info(inode);
890 if (l >= sizeof(oinfo->oi_inline)) {
891 CDEBUG(D_INFO, "l=%d, normal symlink\n", l);
892 inode->i_op = &obdfs_symlink_inode_operations;
894 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
900 link = (char *)page_address(name_page);
902 CDEBUG(D_INFO, "l=%d, fast symlink\n", l);
903 inode->i_op = &obdfs_fast_symlink_inode_operations;
904 link = oinfo->oi_inline;
905 oinfo->oi_flags |= OBD_FL_INLINEDATA;
907 memcpy(link, symname, l);
909 err = obdfs_do_writepage(name_page, IS_SYNC(inode));
910 /* PDEBUG(name_page, "symlink"); */
911 obd_unlock_page(name_page);
912 page_cache_release(name_page);
919 mark_inode_dirty(inode);
921 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len,
925 de->inode = cpu_to_le32(inode->i_ino);
926 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
927 dir->i_version = ++event;
928 err = obdfs_do_writepage(page, IS_SYNC(dir));
929 obd_unlock_page(page);
931 d_instantiate(dentry, inode);
938 mark_inode_dirty(inode);
941 } /* obdfs_symlink */
943 int obdfs_link (struct dentry * old_dentry,
944 struct inode * dir, struct dentry *dentry)
946 struct inode *inode = old_dentry->d_inode;
947 struct ext2_dir_entry_2 * de;
953 if (S_ISDIR(inode->i_mode))
956 if (inode->i_nlink >= EXT2_LINK_MAX)
959 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
963 de->inode = cpu_to_le32(inode->i_ino);
964 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
965 dir->i_version = ++event;
967 err = obdfs_do_writepage(page, IS_SYNC(dir));
968 obd_unlock_page(page);
970 page_cache_release(page);
972 inode->i_ctime = CURRENT_TIME;
973 mark_inode_dirty(inode);
974 atomic_inc(&inode->i_count);
975 d_instantiate(dentry, inode);
979 #define PARENT_INO(buffer) \
980 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
981 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
984 * Anybody can rename anything with this: the permission checks are left to the
985 * higher-level routines.
987 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
988 struct inode * new_dir, struct dentry *new_dentry)
990 struct inode * old_inode, * new_inode;
991 struct page * old_page, * new_page, * dir_page;
992 struct ext2_dir_entry_2 * old_de, * new_de;
997 new_page = dir_page = NULL;
999 /* does the old entry exist? - if not get out */
1000 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
1001 /* PDEBUG(old_page, "rename - old page"); */
1003 * Check for inode number is _not_ due to possible IO errors.
1004 * We might rmdir the source, keep it as pwd of some process
1005 * and merrily kill the link to whatever was created under the
1006 * same name. Goodbye sticky bit ;-<
1008 old_inode = old_dentry->d_inode;
1010 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino) {
1015 /* find new inode */
1016 new_inode = new_dentry->d_inode;
1017 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
1018 new_dentry->d_name.len, &new_de, NOLOCK);
1019 /* PDEBUG(new_page, "rename - new page "); */
1022 page_cache_release(new_page);
1025 DQUOT_INIT(new_inode);
1028 /* in this case we to check more ... */
1029 if (S_ISDIR(old_inode->i_mode)) {
1030 /* can only rename into empty new directory */
1032 retval = -ENOTEMPTY;
1033 if (!empty_dir (new_inode)) {
1039 dir_page = obdfs_getpage (old_inode, 0, 0, LOCKED);
1040 /* PDEBUG(dir_page, "rename dir page"); */
1046 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) !=
1052 if (!new_inode && new_dir!=old_dir &&
1053 new_dir->i_nlink >= EXT2_LINK_MAX) {
1058 /* create the target dir entry */
1060 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1061 new_dentry->d_name.len, &new_de,
1063 /* PDEBUG(new_page, "rename new page"); */
1069 new_dir->i_version = ++event;
1072 * remove the old entry
1074 new_de->inode = le32_to_cpu(old_inode->i_ino);
1075 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1076 EXT2_FEATURE_INCOMPAT_FILETYPE))
1077 new_de->file_type = old_de->file_type;
1079 obdfs_delete_entry (old_de, old_page);
1081 old_dir->i_version = ++event;
1083 new_inode->i_nlink--;
1084 new_inode->i_ctime = CURRENT_TIME;
1085 mark_inode_dirty(new_inode);
1087 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1088 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1089 mark_inode_dirty(old_dir);
1091 PARENT_INO(page_address(dir_page)) =le32_to_cpu(new_dir->i_ino);
1092 retval = obdfs_do_writepage(dir_page, IS_SYNC(old_inode));
1093 /* XXX handle err - not sure if this is correct */
1099 mark_inode_dirty(old_dir);
1101 new_inode->i_nlink--;
1102 mark_inode_dirty(new_inode);
1105 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1106 mark_inode_dirty(new_dir);
1109 if ( old_page != new_page ) {
1110 unsigned long index = old_page->index;
1111 /* lock the old_page and release unlocked copy */
1112 CDEBUG(D_INFO, "old_page at %p\n", old_page);
1113 page_cache_release(old_page);
1114 old_page = obdfs_getpage(old_dir, index << PAGE_SHIFT, 0,
1116 CDEBUG(D_INFO, "old_page at %p\n", old_page);
1117 retval = obdfs_do_writepage(old_page,IS_SYNC(old_dir));
1118 /* XXX handle err - not sure if this is correct */
1125 retval = obdfs_do_writepage(new_page, IS_SYNC(new_dir));
1128 if (old_page && PageLocked(old_page) )
1129 obd_unlock_page(old_page);
1131 page_cache_release(old_page);
1132 if (new_page && PageLocked(new_page) )
1133 obd_unlock_page(new_page);
1135 page_cache_release(new_page);
1136 if (dir_page && PageLocked(dir_page) )
1137 obd_unlock_page(dir_page);
1139 page_cache_release(dir_page);
1142 } /* obdfs_rename */