2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001-2003 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
10 * $Id: dir.c,v 1.86 2005/07/06 12:13:09 dwmw2 Exp $
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/sched.h>
18 #include <linux/crc32.h>
19 #include <linux/jffs2.h>
20 #include <linux/jffs2_fs_i.h>
21 #include <linux/jffs2_fs_sb.h>
22 #include <linux/time.h>
25 static int jffs2_readdir (struct file *, void *, filldir_t);
27 static int jffs2_create (struct inode *,struct dentry *,int,
29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32 static int jffs2_unlink (struct inode *,struct dentry *);
33 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
34 static int jffs2_mkdir (struct inode *,struct dentry *,int);
35 static int jffs2_rmdir (struct inode *,struct dentry *);
36 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
37 static int jffs2_rename (struct inode *, struct dentry *,
38 struct inode *, struct dentry *);
40 struct file_operations jffs2_dir_operations =
42 .read = generic_read_dir,
43 .readdir = jffs2_readdir,
49 struct inode_operations jffs2_dir_inode_operations =
51 .create = jffs2_create,
52 .lookup = jffs2_lookup,
54 .unlink = jffs2_unlink,
55 .symlink = jffs2_symlink,
59 .rename = jffs2_rename,
60 .setattr = jffs2_setattr,
63 /***********************************************************************/
66 /* We keep the dirent list sorted in increasing order of name hash,
67 and we use the same hash function as the dentries. Makes this
70 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
73 struct jffs2_inode_info *dir_f;
74 struct jffs2_sb_info *c;
75 struct jffs2_full_dirent *fd = NULL, *fd_list;
77 struct inode *inode = NULL;
79 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
81 dir_f = JFFS2_INODE_INFO(dir_i);
82 c = JFFS2_SB_INFO(dir_i->i_sb);
86 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
87 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
88 if (fd_list->nhash == target->d_name.hash &&
89 (!fd || fd_list->version > fd->version) &&
90 strlen(fd_list->name) == target->d_name.len &&
91 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
99 inode = iget(dir_i->i_sb, ino);
101 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
102 return (ERR_PTR(-EIO));
106 d_add(target, inode);
111 /***********************************************************************/
114 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
116 struct jffs2_inode_info *f;
117 struct jffs2_sb_info *c;
118 struct inode *inode = filp->f_dentry->d_inode;
119 struct jffs2_full_dirent *fd;
120 unsigned long offset, curofs;
122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
124 f = JFFS2_INODE_INFO(inode);
125 c = JFFS2_SB_INFO(inode->i_sb);
127 offset = filp->f_pos;
130 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
131 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
136 unsigned long pino = parent_ino(filp->f_dentry);
137 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
138 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
145 for (fd = f->dents; fd; fd = fd->next) {
148 /* First loop: curofs = 2; offset = 2 */
149 if (curofs < offset) {
150 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
151 fd->name, fd->ino, fd->type, curofs, offset));
155 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
159 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
160 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
166 filp->f_pos = offset;
170 /***********************************************************************/
173 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
174 struct nameidata *nd)
176 struct jffs2_raw_inode *ri;
177 struct jffs2_inode_info *f, *dir_f;
178 struct jffs2_sb_info *c;
182 ri = jffs2_alloc_raw_inode();
186 c = JFFS2_SB_INFO(dir_i->i_sb);
188 D1(printk(KERN_DEBUG "jffs2_create()\n"));
190 inode = jffs2_new_inode(dir_i, mode, ri);
193 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
194 jffs2_free_raw_inode(ri);
195 return PTR_ERR(inode);
198 inode->i_op = &jffs2_file_inode_operations;
199 inode->i_fop = &jffs2_file_operations;
200 inode->i_mapping->a_ops = &jffs2_file_address_operations;
201 inode->i_mapping->nrpages = 0;
203 f = JFFS2_INODE_INFO(inode);
204 dir_f = JFFS2_INODE_INFO(dir_i);
206 ret = jffs2_do_create(c, dir_f, f, ri,
207 dentry->d_name.name, dentry->d_name.len);
210 make_bad_inode(inode);
212 jffs2_free_raw_inode(ri);
216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
218 jffs2_free_raw_inode(ri);
219 d_instantiate(dentry, inode);
221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
226 /***********************************************************************/
229 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
231 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
232 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
233 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
236 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
237 dentry->d_name.len, dead_f);
238 if (dead_f->inocache)
239 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
242 /***********************************************************************/
245 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
247 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
248 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
253 /* Don't let people make hard links to bad inodes. */
257 if (S_ISDIR(old_dentry->d_inode->i_mode))
260 /* XXX: This is ugly */
261 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
262 if (!type) type = DT_REG;
264 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
268 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
270 d_instantiate(dentry, old_dentry->d_inode);
271 atomic_inc(&old_dentry->d_inode->i_count);
276 /***********************************************************************/
278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
280 struct jffs2_inode_info *f, *dir_f;
281 struct jffs2_sb_info *c;
283 struct jffs2_raw_inode *ri;
284 struct jffs2_raw_dirent *rd;
285 struct jffs2_full_dnode *fn;
286 struct jffs2_full_dirent *fd;
288 uint32_t alloclen, phys_ofs;
289 int ret, targetlen = strlen(target);
291 /* FIXME: If you care. We'd need to use frags for the target
292 if it grows much more than this */
296 ri = jffs2_alloc_raw_inode();
301 c = JFFS2_SB_INFO(dir_i->i_sb);
303 /* Try to reserve enough space for both node and dirent.
304 * Just the node will do for now, though
306 namelen = dentry->d_name.len;
307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
310 jffs2_free_raw_inode(ri);
314 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
317 jffs2_free_raw_inode(ri);
318 jffs2_complete_reservation(c);
319 return PTR_ERR(inode);
322 inode->i_op = &jffs2_symlink_inode_operations;
324 f = JFFS2_INODE_INFO(inode);
326 inode->i_size = targetlen;
327 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
328 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
329 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
331 ri->compr = JFFS2_COMPR_NONE;
332 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
333 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
335 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
337 jffs2_free_raw_inode(ri);
340 /* Eeek. Wave bye bye */
342 jffs2_complete_reservation(c);
343 jffs2_clear_inode(inode);
347 /* We use f->dents field to store the target path. */
348 f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
350 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
352 jffs2_complete_reservation(c);
353 jffs2_clear_inode(inode);
357 memcpy(f->dents, target, targetlen + 1);
358 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));
360 /* No data here. Only a metadata node, which will be
361 obsoleted by the first data write
366 jffs2_complete_reservation(c);
367 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
370 jffs2_clear_inode(inode);
374 rd = jffs2_alloc_raw_dirent();
376 /* Argh. Now we treat it like a normal delete */
377 jffs2_complete_reservation(c);
378 jffs2_clear_inode(inode);
382 dir_f = JFFS2_INODE_INFO(dir_i);
385 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
386 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
387 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
388 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
390 rd->pino = cpu_to_je32(dir_i->i_ino);
391 rd->version = cpu_to_je32(++dir_f->highest_version);
392 rd->ino = cpu_to_je32(inode->i_ino);
393 rd->mctime = cpu_to_je32(get_seconds());
396 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
397 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
399 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
402 /* dirent failed to write. Delete the inode normally
403 as if it were the final unlink() */
404 jffs2_complete_reservation(c);
405 jffs2_free_raw_dirent(rd);
407 jffs2_clear_inode(inode);
411 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
413 jffs2_free_raw_dirent(rd);
415 /* Link the fd into the inode's list, obsoleting an old
417 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
420 jffs2_complete_reservation(c);
422 d_instantiate(dentry, inode);
427 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
429 struct jffs2_inode_info *f, *dir_f;
430 struct jffs2_sb_info *c;
432 struct jffs2_raw_inode *ri;
433 struct jffs2_raw_dirent *rd;
434 struct jffs2_full_dnode *fn;
435 struct jffs2_full_dirent *fd;
437 uint32_t alloclen, phys_ofs;
442 ri = jffs2_alloc_raw_inode();
446 c = JFFS2_SB_INFO(dir_i->i_sb);
448 /* Try to reserve enough space for both node and dirent.
449 * Just the node will do for now, though
451 namelen = dentry->d_name.len;
452 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
455 jffs2_free_raw_inode(ri);
459 inode = jffs2_new_inode(dir_i, mode, ri);
462 jffs2_free_raw_inode(ri);
463 jffs2_complete_reservation(c);
464 return PTR_ERR(inode);
467 inode->i_op = &jffs2_dir_inode_operations;
468 inode->i_fop = &jffs2_dir_operations;
469 /* Directories get nlink 2 at start */
472 f = JFFS2_INODE_INFO(inode);
474 ri->data_crc = cpu_to_je32(0);
475 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
477 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
479 jffs2_free_raw_inode(ri);
482 /* Eeek. Wave bye bye */
484 jffs2_complete_reservation(c);
485 jffs2_clear_inode(inode);
488 /* No data here. Only a metadata node, which will be
489 obsoleted by the first data write
494 jffs2_complete_reservation(c);
495 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
498 jffs2_clear_inode(inode);
502 rd = jffs2_alloc_raw_dirent();
504 /* Argh. Now we treat it like a normal delete */
505 jffs2_complete_reservation(c);
506 jffs2_clear_inode(inode);
510 dir_f = JFFS2_INODE_INFO(dir_i);
513 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
514 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
515 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
516 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
518 rd->pino = cpu_to_je32(dir_i->i_ino);
519 rd->version = cpu_to_je32(++dir_f->highest_version);
520 rd->ino = cpu_to_je32(inode->i_ino);
521 rd->mctime = cpu_to_je32(get_seconds());
524 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
525 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
527 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
530 /* dirent failed to write. Delete the inode normally
531 as if it were the final unlink() */
532 jffs2_complete_reservation(c);
533 jffs2_free_raw_dirent(rd);
535 jffs2_clear_inode(inode);
539 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
542 jffs2_free_raw_dirent(rd);
544 /* Link the fd into the inode's list, obsoleting an old
546 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
549 jffs2_complete_reservation(c);
551 d_instantiate(dentry, inode);
555 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
557 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
558 struct jffs2_full_dirent *fd;
561 for (fd = f->dents ; fd; fd = fd->next) {
565 ret = jffs2_unlink(dir_i, dentry);
571 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
573 struct jffs2_inode_info *f, *dir_f;
574 struct jffs2_sb_info *c;
576 struct jffs2_raw_inode *ri;
577 struct jffs2_raw_dirent *rd;
578 struct jffs2_full_dnode *fn;
579 struct jffs2_full_dirent *fd;
583 uint32_t alloclen, phys_ofs;
586 if (!old_valid_dev(rdev))
589 ri = jffs2_alloc_raw_inode();
593 c = JFFS2_SB_INFO(dir_i->i_sb);
595 if (S_ISBLK(mode) || S_ISCHR(mode)) {
596 dev = cpu_to_je16(old_encode_dev(rdev));
597 devlen = sizeof(dev);
600 /* Try to reserve enough space for both node and dirent.
601 * Just the node will do for now, though
603 namelen = dentry->d_name.len;
604 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
607 jffs2_free_raw_inode(ri);
611 inode = jffs2_new_inode(dir_i, mode, ri);
614 jffs2_free_raw_inode(ri);
615 jffs2_complete_reservation(c);
616 return PTR_ERR(inode);
618 inode->i_op = &jffs2_file_inode_operations;
619 init_special_inode(inode, inode->i_mode, rdev);
621 f = JFFS2_INODE_INFO(inode);
623 ri->dsize = ri->csize = cpu_to_je32(devlen);
624 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
625 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
627 ri->compr = JFFS2_COMPR_NONE;
628 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
629 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
631 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
633 jffs2_free_raw_inode(ri);
636 /* Eeek. Wave bye bye */
638 jffs2_complete_reservation(c);
639 jffs2_clear_inode(inode);
642 /* No data here. Only a metadata node, which will be
643 obsoleted by the first data write
648 jffs2_complete_reservation(c);
649 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
652 jffs2_clear_inode(inode);
656 rd = jffs2_alloc_raw_dirent();
658 /* Argh. Now we treat it like a normal delete */
659 jffs2_complete_reservation(c);
660 jffs2_clear_inode(inode);
664 dir_f = JFFS2_INODE_INFO(dir_i);
667 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
668 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
669 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
670 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
672 rd->pino = cpu_to_je32(dir_i->i_ino);
673 rd->version = cpu_to_je32(++dir_f->highest_version);
674 rd->ino = cpu_to_je32(inode->i_ino);
675 rd->mctime = cpu_to_je32(get_seconds());
678 /* XXX: This is ugly. */
679 rd->type = (mode & S_IFMT) >> 12;
681 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
682 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
684 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
687 /* dirent failed to write. Delete the inode normally
688 as if it were the final unlink() */
689 jffs2_complete_reservation(c);
690 jffs2_free_raw_dirent(rd);
692 jffs2_clear_inode(inode);
696 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
698 jffs2_free_raw_dirent(rd);
700 /* Link the fd into the inode's list, obsoleting an old
702 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
705 jffs2_complete_reservation(c);
707 d_instantiate(dentry, inode);
712 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
713 struct inode *new_dir_i, struct dentry *new_dentry)
716 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
717 struct jffs2_inode_info *victim_f = NULL;
720 /* The VFS will check for us and prevent trying to rename a
721 * file over a directory and vice versa, but if it's a directory,
722 * the VFS can't check whether the victim is empty. The filesystem
723 * needs to do that for itself.
725 if (new_dentry->d_inode) {
726 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
727 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
728 struct jffs2_full_dirent *fd;
730 down(&victim_f->sem);
731 for (fd = victim_f->dents; fd; fd = fd->next) {
741 /* XXX: We probably ought to alloc enough space for
742 both nodes at the same time. Writing the new link,
743 then getting -ENOSPC, is quite bad :)
746 /* Make a hard link */
748 /* XXX: This is ugly */
749 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
750 if (!type) type = DT_REG;
752 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
753 old_dentry->d_inode->i_ino, type,
754 new_dentry->d_name.name, new_dentry->d_name.len);
760 /* There was a victim. Kill it off nicely */
761 new_dentry->d_inode->i_nlink--;
762 /* Don't oops if the victim was a dirent pointing to an
763 inode which didn't exist. */
764 if (victim_f->inocache) {
765 down(&victim_f->sem);
766 victim_f->inocache->nlink--;
771 /* If it was a directory we moved, and there was no victim,
772 increase i_nlink on its new parent */
773 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
774 new_dir_i->i_nlink++;
776 /* Unlink the original */
777 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
778 old_dentry->d_name.name, old_dentry->d_name.len, NULL);
780 /* We don't touch inode->i_nlink */
783 /* Oh shit. We really ought to make a single node which can do both atomically */
784 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
786 old_dentry->d_inode->i_nlink++;
788 f->inocache->nlink++;
791 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
792 /* Might as well let the VFS know */
793 d_instantiate(new_dentry, old_dentry->d_inode);
794 atomic_inc(&old_dentry->d_inode->i_count);
798 if (S_ISDIR(old_dentry->d_inode->i_mode))
799 old_dir_i->i_nlink--;