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)
157 struct inode * inode;
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, &de, LOCKED);
168 CDEBUG(D_INODE, "No page - negative entry.\n");
170 CDEBUG(D_INODE, "Danger: PAGE but de.\n");
171 return ERR_PTR(-ENOENT);
174 unsigned long ino = le32_to_cpu(de->inode);
176 page_cache_release(page);
177 inode = iget(dir->i_sb, ino);
180 CDEBUG(D_INODE, "No inode.\n");
182 return ERR_PTR(-EACCES);
185 d_add(dentry, inode);
194 * adds a file entry to the specified directory, using the same
195 * semantics as ext2_find_entry(). It returns NULL if it failed.
197 * NOTE!! The inode part of 'de' is left at 0 - which means you
198 * may not sleep between calling this and putting something into
199 * the entry, as someone else might have used it while you slept.
201 * returns a locked and held page upon success
204 /* XXX I believe these pages should in fact NOT be locked */
206 static struct page *obdfs_add_entry (struct inode * dir,
207 const char * name, int namelen,
208 struct ext2_dir_entry_2 ** res_dir,
211 unsigned long offset;
212 unsigned short rec_len;
214 struct ext2_dir_entry_2 * de, * de1;
215 struct super_block * sb;
220 if (!dir || !dir->i_nlink) {
231 * Is this a busy deleted directory? Can't create new files if so
233 if (dir->i_size == 0)
239 page = obdfs_getpage(dir, 0, 0, LOCKED);
244 rec_len = EXT2_DIR_REC_LEN(namelen);
245 CDEBUG(D_INODE, "reclen: %d\n", rec_len);
246 PDEBUG(page, "starting search");
248 de = (struct ext2_dir_entry_2 *) page_address(page);
251 CDEBUG(D_INODE, "Considering entry at %p, (page at %#lx - %#lx), offset %ld\n",
252 de, page_address(page), page_address(page) + PAGE_SIZE, offset);
253 if ((char *)de >= PAGE_SIZE + (char *)page_address(page)) {
255 page_cache_release(page);
256 page = obdfs_getpage(dir, offset, 1, LOCKED);
261 PDEBUG(page, "new directory page");
262 if (dir->i_size <= offset) {
263 if (dir->i_size == 0) {
269 CDEBUG(D_INODE, "creating next block\n");
271 de = (struct ext2_dir_entry_2 *) page_address(page);
273 de->rec_len = le16_to_cpu(PAGE_SIZE);
274 dir->i_size = offset + PAGE_SIZE;
275 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
276 mark_inode_dirty(dir);
279 ext2_debug ("skipping to next block\n");
281 de = (struct ext2_dir_entry_2 *) page_address(page);
284 CDEBUG(D_INODE, "\n");
285 if (!obdfs_check_dir_entry ("ext2_add_entry", dir, de, page,
289 page_cache_release(page);
293 CDEBUG(D_INODE, "\n");
294 if (ext2_match (namelen, name, de)) {
297 page_cache_release(page);
301 CDEBUG(D_INODE, "Testing for enough space at de %p\n", de);
302 if ( (le32_to_cpu(de->inode) == 0 && le16_to_cpu(de->rec_len) >= rec_len) ||
303 (le16_to_cpu(de->rec_len) >= EXT2_DIR_REC_LEN(de->name_len) + rec_len)) {
304 offset += le16_to_cpu(de->rec_len);
305 CDEBUG(D_INODE, "Found enough space de %p, offset %#lx\n", de, offset);
306 if (le32_to_cpu(de->inode)) {
307 CDEBUG(D_INODE, "Inserting new in %p\n", de);
308 de1 = (struct ext2_dir_entry_2 *) ((char *) de +
309 EXT2_DIR_REC_LEN(de->name_len));
310 CDEBUG(D_INODE, "-- de1 at %p\n", de1);
311 de1->rec_len = cpu_to_le16(le16_to_cpu(de->rec_len) -
312 EXT2_DIR_REC_LEN(de->name_len));
313 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
316 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);
318 de->name_len = namelen;
320 memcpy (de->name, name, namelen);
321 CDEBUG(D_INODE, "Copy done\n");
323 * XXX shouldn't update any times until successful
324 * completion of syscall, but too many callers depend
327 * XXX similarly, too many callers depend on
328 * ext2_new_inode() setting the times, but error
329 * recovery deletes the inode, so the worst that can
330 * happen is that the times are slightly out of date
331 * and/or different from the directory change time.
333 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
334 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
335 mark_inode_dirty(dir);
336 dir->i_version = ++event;
339 PDEBUG(page, "addentry");
340 CDEBUG(D_INODE, "Regular exit from add_entry");
344 CDEBUG(D_INODE, "\n");
345 offset += le16_to_cpu(de->rec_len);
346 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
349 CDEBUG(D_INODE, "\n");
352 page_cache_release(page);
353 PDEBUG(page, "addentry");
356 } /* obdfs_add_entry */
359 * obdfs_delete_entry deletes a directory entry by merging it with the
362 static int obdfs_delete_entry (struct ext2_dir_entry_2 * dir,
365 struct ext2_dir_entry_2 * de, * pde;
370 de = (struct ext2_dir_entry_2 *) page_address(page);
371 while (i < PAGE_SIZE) {
372 if (!obdfs_check_dir_entry ("ext2_delete_entry", NULL,
378 cpu_to_le16(le16_to_cpu(pde->rec_len) +
379 le16_to_cpu(dir->rec_len));
384 i += le16_to_cpu(de->rec_len);
386 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
389 } /* obdfs_delete_entry */
392 static inline void ext2_set_de_type(struct super_block *sb,
393 struct ext2_dir_entry_2 *de,
395 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_FILETYPE))
398 de->file_type = EXT2_FT_CHRDEV;
399 else if (S_ISBLK(mode))
400 de->file_type = EXT2_FT_BLKDEV;
401 else if (S_ISFIFO(mode))
402 de->file_type = EXT2_FT_FIFO;
403 else if (S_ISLNK(mode))
404 de->file_type = EXT2_FT_SYMLINK;
405 else if (S_ISREG(mode))
406 de->file_type = EXT2_FT_REG_FILE;
407 else if (S_ISDIR(mode))
408 de->file_type = EXT2_FT_DIR;
413 * Display all dentries holding the specified inode.
416 static void show_dentry(struct list_head * dlist, int subdirs)
418 struct list_head *tmp = dlist;
420 while ((tmp = tmp->next) != dlist) {
421 struct dentry * dentry;
422 const char * unhashed = "";
425 dentry = list_entry(tmp, struct dentry, d_child);
427 dentry = list_entry(tmp, struct dentry, d_alias);
429 if (list_empty(&dentry->d_hash))
430 unhashed = "(unhashed)";
432 if ( dentry->d_inode )
433 printk("show_dentry: %s/%s, d_count=%d%s (ino %ld, dev %d, ct %d)\n",
434 dentry->d_parent->d_name.name,
435 dentry->d_name.name, dentry->d_count,
436 unhashed, dentry->d_inode->i_ino,
437 dentry->d_inode->i_dev,
438 dentry->d_inode->i_count);
440 printk("show_dentry: %s/%s, d_count=%d%s \n",
441 dentry->d_parent->d_name.name,
442 dentry->d_name.name, dentry->d_count,
449 struct inode *obdfs_new_inode(struct inode *dir)
459 return ERR_PTR(-ENOMEM);
462 err = IOPS(dir, create)(IID(dir), oa);
470 inode = iget(dir->i_sb, (ino_t)oa->o_id);
473 IOPS(dir, destroy)(IID(dir), oa);
476 return ERR_PTR(-EIO);
479 if (!list_empty(&inode->i_dentry)) {
480 CDEBUG(D_INODE, "New inode (%ld) has aliases!\n", inode->i_ino);
481 IOPS(dir, destroy)(IID(dir), oa);
485 return ERR_PTR(-EIO);
488 INIT_LIST_HEAD(&OBDFS_LIST(inode));
493 } /* obdfs_new_inode */
497 * By the time this is called, we already have created
498 * the directory cache entry for the new file, but it
499 * is so far negative - it has no inode.
501 * If the create succeeds, we fill in the inode information
502 * with d_instantiate().
504 int obdfs_create (struct inode * dir, struct dentry * dentry, int mode)
506 struct inode * inode;
508 struct ext2_dir_entry_2 * de;
512 inode = obdfs_new_inode(dir);
513 if ( IS_ERR(inode) ) {
515 return PTR_ERR(inode);
518 inode->i_op = &obdfs_file_inode_operations;
519 inode->i_mode = mode;
520 mark_inode_dirty(inode);
521 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
524 mark_inode_dirty(inode);
529 de->inode = cpu_to_le32(inode->i_ino);
530 ext2_set_de_type(dir->i_sb, de, S_IFREG);
531 dir->i_version = ++event;
533 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
536 page_cache_release(page);
537 d_instantiate(dentry, inode);
542 int obdfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
544 struct inode * inode;
546 struct ext2_dir_entry_2 * de;
551 inode = obdfs_new_inode(dir);
552 if ( IS_ERR(inode) ) {
554 return PTR_ERR(inode);
557 inode->i_uid = current->fsuid;
558 init_special_inode(inode, mode, rdev);
559 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
562 de->inode = cpu_to_le32(inode->i_ino);
563 dir->i_version = ++event;
564 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
565 mark_inode_dirty(inode);
567 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
570 d_instantiate(dentry, inode);
571 page_cache_release(page);
578 mark_inode_dirty(inode);
583 int obdfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
585 struct inode * inode;
586 struct page *page, *inode_page;
587 struct ext2_dir_entry_2 * de;
593 if (dir->i_nlink >= EXT2_LINK_MAX)
596 inode = obdfs_new_inode(dir);
597 if ( IS_ERR(inode) ) {
599 return PTR_ERR(inode);
602 inode->i_op = &obdfs_dir_inode_operations;
604 inode_page = obdfs_getpage(inode, 0, 1, LOCKED);
606 inode->i_nlink--; /* is this nlink == 0? */
607 mark_inode_dirty(inode);
612 /* create . and .. */
613 de = (struct ext2_dir_entry_2 *) page_address(inode_page);
614 de->inode = cpu_to_le32(inode->i_ino);
616 de->rec_len = cpu_to_le16(EXT2_DIR_REC_LEN(de->name_len));
617 strcpy (de->name, ".");
618 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
620 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
621 de->inode = cpu_to_le32(dir->i_ino);
622 de->rec_len = cpu_to_le16(PAGE_SIZE - EXT2_DIR_REC_LEN(1));
624 strcpy (de->name, "..");
625 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
628 err = obdfs_do_writepage(inode, inode_page, IS_SYNC(inode));
629 inode->i_blocks = PAGE_SIZE/inode->i_sb->s_blocksize;
630 inode->i_size = PAGE_SIZE;
631 UnlockPage(inode_page);
632 page_cache_release(inode_page);
635 inode->i_mode = S_IFDIR | mode;
636 if (dir->i_mode & S_ISGID)
637 inode->i_mode |= S_ISGID;
638 mark_inode_dirty(inode);
640 /* now deal with the parent */
641 page = obdfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
646 de->inode = cpu_to_le32(inode->i_ino);
647 ext2_set_de_type(dir->i_sb, de, S_IFDIR);
648 dir->i_version = ++event;
651 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
652 mark_inode_dirty(dir);
653 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
654 /* XXX handle err? */
658 page_cache_release(page);
659 d_instantiate(dentry, inode);
666 mark_inode_dirty(inode);
674 * routine to check that the specified directory is empty (for rmdir)
676 static int empty_dir (struct inode * inode)
678 unsigned long offset;
680 struct ext2_dir_entry_2 * de, * de1;
681 struct super_block * sb;
684 if (inode->i_size < EXT2_DIR_REC_LEN(1) + EXT2_DIR_REC_LEN(2) ||
685 !(page = obdfs_getpage (inode, 0, 0, LOCKED))) {
686 ext2_warning (inode->i_sb, "empty_dir",
687 "bad directory (dir #%lu) - no data block",
691 de = (struct ext2_dir_entry_2 *) page_address(page);
692 de1 = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
693 if (le32_to_cpu(de->inode) != inode->i_ino || !le32_to_cpu(de1->inode) ||
694 strcmp (".", de->name) || strcmp ("..", de1->name)) {
695 ext2_warning (inode->i_sb, "empty_dir",
696 "bad directory (dir #%lu) - no `.' or `..'",
698 page_cache_release(page);
701 offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
702 de = (struct ext2_dir_entry_2 *) ((char *) de1 + le16_to_cpu(de1->rec_len));
703 while (offset < inode->i_size ) {
704 if (!page || (void *) de >= (void *) (page_address(page) + PAGE_SIZE)) {
707 page_cache_release(page);
709 page = obdfs_getpage(inode, offset, 0, LOCKED);
712 ext2_error (sb, "empty_dir",
713 "directory #%lu contains a hole at offset %lu",
714 inode->i_ino, offset);
716 offset += sb->s_blocksize;
719 de = (struct ext2_dir_entry_2 *) page_address(page);
721 if (!obdfs_check_dir_entry ("empty_dir", inode, de, page,
724 page_cache_release(page);
727 if (le32_to_cpu(de->inode)) {
729 page_cache_release(page);
732 offset += le16_to_cpu(de->rec_len);
733 de = (struct ext2_dir_entry_2 *) ((char *) de + le16_to_cpu(de->rec_len));
736 page_cache_release(page);
740 int obdfs_rmdir (struct inode * dir, struct dentry *dentry)
743 struct inode * inode;
745 struct ext2_dir_entry_2 * de;
751 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
755 inode = dentry->d_inode;
759 if (le32_to_cpu(de->inode) != inode->i_ino)
763 if (!empty_dir (inode))
766 retval = obdfs_delete_entry (de, page);
767 dir->i_version = ++event;
770 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
771 /* XXX handle err? */
774 if (inode->i_nlink != 2)
775 ext2_warning (inode->i_sb, "ext2_rmdir",
776 "empty directory has nlink!=2 (%d)",
778 inode->i_version = ++event;
781 mark_inode_dirty(inode);
783 inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
784 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
785 mark_inode_dirty(dir);
790 page_cache_release(page);
795 int obdfs_unlink(struct inode * dir, struct dentry *dentry)
798 struct inode * inode;
800 struct ext2_dir_entry_2 * de;
806 page = obdfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, LOCKED);
810 inode = dentry->d_inode;
814 if (le32_to_cpu(de->inode) != inode->i_ino)
817 if (!inode->i_nlink) {
818 ext2_warning (inode->i_sb, "ext2_unlink",
819 "Deleting nonexistent file (%lu), %d",
820 inode->i_ino, inode->i_nlink);
823 retval = obdfs_delete_entry (de, page);
826 dir->i_version = ++event;
827 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
828 /* XXX handle err? */
831 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
832 dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
833 mark_inode_dirty(dir);
835 mark_inode_dirty(inode);
836 inode->i_ctime = dir->i_ctime;
838 d_delete(dentry); /* This also frees the inode */
842 page_cache_release(page);
847 int obdfs_symlink (struct inode * dir, struct dentry *dentry,
848 const char * symname)
850 struct ext2_dir_entry_2 * de;
851 struct inode * inode;
852 struct obdfs_inode_info *oinfo;
853 struct page* page = NULL, * name_page = NULL;
855 int i, l, err = -EIO;
859 inode = obdfs_new_inode(dir);
860 oinfo = OBDFS_INFO(inode);
861 if ( IS_ERR(inode) ) {
863 return PTR_ERR(inode);
866 inode->i_mode = S_IFLNK | S_IRWXUGO;
867 inode->i_op = &obdfs_symlink_inode_operations;
868 for (l = 0; l < inode->i_sb->s_blocksize - 1 && symname [l]; l++)
871 if (l >= sizeof(OBDFS_INFO(inode)->oi_inline)) {
872 CDEBUG(D_INODE, "l=%d, normal symlink\n", l);
874 name_page = obdfs_getpage(inode, 0, 1, LOCKED);
877 mark_inode_dirty(inode);
882 link = (char *)page_address(name_page);
884 link = oinfo->oi_inline;
885 oinfo->oi_flags |= OBD_FL_INLINEDATA;
887 CDEBUG(D_INODE, "l=%d, fast symlink\n", l);
891 while (i < inode->i_sb->s_blocksize - 1 && (c = *(symname++)))
895 err = obdfs_do_writepage(inode, name_page, IS_SYNC(inode));
897 PDEBUG(name_page, "symlink");
898 UnlockPage(name_page);
899 page_cache_release(name_page);
902 mark_inode_dirty(inode);
904 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
907 de->inode = cpu_to_le32(inode->i_ino);
908 ext2_set_de_type(dir->i_sb, de, S_IFLNK);
909 dir->i_version = ++event;
910 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
913 d_instantiate(dentry, inode);
920 mark_inode_dirty(inode);
923 } /* obdfs_symlink */
925 int obdfs_link (struct dentry * old_dentry,
926 struct inode * dir, struct dentry *dentry)
928 struct inode *inode = old_dentry->d_inode;
929 struct ext2_dir_entry_2 * de;
935 if (S_ISDIR(inode->i_mode))
938 if (inode->i_nlink >= EXT2_LINK_MAX)
941 page = obdfs_add_entry (dir, dentry->d_name.name, dentry->d_name.len, &de, &err);
945 de->inode = cpu_to_le32(inode->i_ino);
946 ext2_set_de_type(dir->i_sb, de, inode->i_mode);
947 dir->i_version = ++event;
949 err = obdfs_do_writepage(dir, page, IS_SYNC(dir));
952 page_cache_release(page);
954 inode->i_ctime = CURRENT_TIME;
955 mark_inode_dirty(inode);
957 d_instantiate(dentry, inode);
961 #define PARENT_INO(buffer) \
962 ((struct ext2_dir_entry_2 *) ((char *) buffer + \
963 le16_to_cpu(((struct ext2_dir_entry_2 *) buffer)->rec_len)))->inode
966 * Anybody can rename anything with this: the permission checks are left to the
967 * higher-level routines.
969 int obdfs_rename (struct inode * old_dir, struct dentry *old_dentry,
970 struct inode * new_dir, struct dentry *new_dentry)
972 struct inode * old_inode, * new_inode;
973 struct page * old_page, * new_page, * dir_page;
974 struct ext2_dir_entry_2 * old_de, * new_de;
979 new_page = dir_page = NULL;
981 /* does the old entry exist? - if not get out */
982 old_page = obdfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_de, NOLOCK);
983 PDEBUG(old_page, "rename - old page");
985 * Check for inode number is _not_ due to possible IO errors.
986 * We might rmdir the source, keep it as pwd of some process
987 * and merrily kill the link to whatever was created under the
988 * same name. Goodbye sticky bit ;-<
990 old_inode = old_dentry->d_inode;
992 if (!old_page || le32_to_cpu(old_de->inode) != old_inode->i_ino)
996 new_inode = new_dentry->d_inode;
997 new_page = obdfs_find_entry (new_dir, new_dentry->d_name.name,
998 new_dentry->d_name.len, &new_de, NOLOCK);
999 PDEBUG(new_page, "rename - new page ");
1002 page_cache_release(new_page);
1005 DQUOT_INIT(new_inode);
1008 /* in this case we to check more ... */
1009 if (S_ISDIR(old_inode->i_mode)) {
1010 /* can only rename into empty new directory */
1013 if (!empty_dir (new_inode))
1017 dir_page= obdfs_getpage (old_inode, 0, 0, LOCKED);
1018 PDEBUG(dir_page, "rename dir page");
1022 if (le32_to_cpu(PARENT_INO(page_address(dir_page))) != old_dir->i_ino)
1025 if (!new_inode && new_dir!=old_dir &&
1026 new_dir->i_nlink >= EXT2_LINK_MAX)
1029 /* create the target dir entry */
1031 new_page = obdfs_add_entry (new_dir, new_dentry->d_name.name,
1032 new_dentry->d_name.len, &new_de,
1034 PDEBUG(new_page, "rename new page");
1038 new_dir->i_version = ++event;
1041 * remove the old entry
1043 new_de->inode = le32_to_cpu(old_inode->i_ino);
1044 if (EXT2_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
1045 EXT2_FEATURE_INCOMPAT_FILETYPE))
1046 new_de->file_type = old_de->file_type;
1048 obdfs_delete_entry (old_de, old_page);
1050 old_dir->i_version = ++event;
1052 new_inode->i_nlink--;
1053 new_inode->i_ctime = CURRENT_TIME;
1054 mark_inode_dirty(new_inode);
1056 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1057 old_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1058 mark_inode_dirty(old_dir);
1060 PARENT_INO(page_address(dir_page)) = le32_to_cpu(new_dir->i_ino);
1061 /* XXX handle err */
1062 err = obdfs_do_writepage(old_inode, dir_page, IS_SYNC(old_inode));
1064 mark_inode_dirty(old_dir);
1066 new_inode->i_nlink--;
1067 mark_inode_dirty(new_inode);
1070 new_dir->u.ext2_i.i_flags &= ~EXT2_BTREE_FL;
1071 mark_inode_dirty(new_dir);
1074 if ( old_page != new_page ) {
1075 unsigned long index = old_page->index;
1076 /* lock the old_page and release unlocked copy */
1077 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1078 page_cache_release(old_page);
1079 old_page = obdfs_getpage(old_dir, index >> PAGE_SHIFT, 0, LOCKED);
1080 CDEBUG(D_INODE, "old_page at %p\n", old_page);
1081 /* XXX handle err */
1082 err = obdfs_do_writepage(old_dir, old_page, IS_SYNC(old_dir));
1085 err = obdfs_do_writepage(new_dir, new_page, IS_SYNC(new_dir));
1088 if (old_page && PageLocked(old_page) )
1089 UnlockPage(old_page);
1091 page_cache_release(old_page);
1092 if (new_page && PageLocked(new_page) )
1093 UnlockPage(new_page);
1095 page_cache_release(new_page);
1096 if (dir_page && PageLocked(dir_page) )
1097 UnlockPage(dir_page);
1099 page_cache_release(dir_page);
1103 } /* obdfs_rename */