2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in this directory.
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
15 #include <linux/crc32.h>
16 #include <linux/jffs2.h>
17 #include "jffs2_fs_i.h"
18 #include "jffs2_fs_sb.h"
19 #include <linux/time.h>
22 static int jffs2_readdir (struct file *, void *, filldir_t);
24 static int jffs2_create (struct inode *,struct dentry *,int,
26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
29 static int jffs2_unlink (struct inode *,struct dentry *);
30 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
31 static int jffs2_mkdir (struct inode *,struct dentry *,int);
32 static int jffs2_rmdir (struct inode *,struct dentry *);
33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
34 static int jffs2_rename (struct inode *, struct dentry *,
35 struct inode *, struct dentry *);
37 const struct file_operations jffs2_dir_operations =
39 .read = generic_read_dir,
40 .readdir = jffs2_readdir,
41 .unlocked_ioctl=jffs2_ioctl,
43 .llseek = generic_file_llseek,
47 const struct inode_operations jffs2_dir_inode_operations =
49 .create = jffs2_create,
50 .lookup = jffs2_lookup,
52 .unlink = jffs2_unlink,
53 .symlink = jffs2_symlink,
57 .rename = jffs2_rename,
58 .check_acl = jffs2_check_acl,
59 .setattr = jffs2_setattr,
60 .setxattr = jffs2_setxattr,
61 .getxattr = jffs2_getxattr,
62 .listxattr = jffs2_listxattr,
63 .removexattr = jffs2_removexattr
66 /***********************************************************************/
69 /* We keep the dirent list sorted in increasing order of name hash,
70 and we use the same hash function as the dentries. Makes this
73 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
76 struct jffs2_inode_info *dir_f;
77 struct jffs2_sb_info *c;
78 struct jffs2_full_dirent *fd = NULL, *fd_list;
80 struct inode *inode = NULL;
82 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
84 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
85 return ERR_PTR(-ENAMETOOLONG);
87 dir_f = JFFS2_INODE_INFO(dir_i);
88 c = JFFS2_SB_INFO(dir_i->i_sb);
90 mutex_lock(&dir_f->sem);
92 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
93 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
94 if (fd_list->nhash == target->d_name.hash &&
95 (!fd || fd_list->version > fd->version) &&
96 strlen(fd_list->name) == target->d_name.len &&
97 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
103 mutex_unlock(&dir_f->sem);
105 inode = jffs2_iget(dir_i->i_sb, ino);
107 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
108 return ERR_CAST(inode);
112 return d_splice_alias(inode, target);
115 /***********************************************************************/
118 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
120 struct jffs2_inode_info *f;
121 struct jffs2_sb_info *c;
122 struct inode *inode = filp->f_path.dentry->d_inode;
123 struct jffs2_full_dirent *fd;
124 unsigned long offset, curofs;
126 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
128 f = JFFS2_INODE_INFO(inode);
129 c = JFFS2_SB_INFO(inode->i_sb);
131 offset = filp->f_pos;
134 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
135 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
140 unsigned long pino = parent_ino(filp->f_path.dentry);
141 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
142 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
149 for (fd = f->dents; fd; fd = fd->next) {
152 /* First loop: curofs = 2; offset = 2 */
153 if (curofs < offset) {
154 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
155 fd->name, fd->ino, fd->type, curofs, offset));
159 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
163 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
164 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
168 mutex_unlock(&f->sem);
170 filp->f_pos = offset;
174 /***********************************************************************/
177 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
178 struct nameidata *nd)
180 struct jffs2_raw_inode *ri;
181 struct jffs2_inode_info *f, *dir_f;
182 struct jffs2_sb_info *c;
186 ri = jffs2_alloc_raw_inode();
190 c = JFFS2_SB_INFO(dir_i->i_sb);
192 D1(printk(KERN_DEBUG "jffs2_create()\n"));
194 inode = jffs2_new_inode(dir_i, mode, ri);
197 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
198 jffs2_free_raw_inode(ri);
199 return PTR_ERR(inode);
202 inode->i_op = &jffs2_file_inode_operations;
203 inode->i_fop = &jffs2_file_operations;
204 inode->i_mapping->a_ops = &jffs2_file_address_operations;
205 inode->i_mapping->nrpages = 0;
207 f = JFFS2_INODE_INFO(inode);
208 dir_f = JFFS2_INODE_INFO(dir_i);
210 /* jffs2_do_create() will want to lock it, _after_ reserving
211 space and taking c-alloc_sem. If we keep it locked here,
212 lockdep gets unhappy (although it's a false positive;
213 nothing else will be looking at this inode yet so there's
214 no chance of AB-BA deadlock involving its f->sem). */
215 mutex_unlock(&f->sem);
217 ret = jffs2_do_create(c, dir_f, f, ri,
218 dentry->d_name.name, dentry->d_name.len);
222 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
224 jffs2_free_raw_inode(ri);
226 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
227 inode->i_ino, inode->i_mode, inode->i_nlink,
228 f->inocache->pino_nlink, inode->i_mapping->nrpages));
230 d_instantiate(dentry, inode);
231 unlock_new_inode(inode);
235 make_bad_inode(inode);
236 unlock_new_inode(inode);
238 jffs2_free_raw_inode(ri);
242 /***********************************************************************/
245 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
247 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
248 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
249 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
251 uint32_t now = get_seconds();
253 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
254 dentry->d_name.len, dead_f, now);
255 if (dead_f->inocache)
256 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
258 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
261 /***********************************************************************/
264 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
266 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
267 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
268 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
273 /* Don't let people make hard links to bad inodes. */
277 if (S_ISDIR(old_dentry->d_inode->i_mode))
280 /* XXX: This is ugly */
281 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
282 if (!type) type = DT_REG;
285 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
289 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
290 mutex_unlock(&f->sem);
291 d_instantiate(dentry, old_dentry->d_inode);
292 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
293 atomic_inc(&old_dentry->d_inode->i_count);
298 /***********************************************************************/
300 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
302 struct jffs2_inode_info *f, *dir_f;
303 struct jffs2_sb_info *c;
305 struct jffs2_raw_inode *ri;
306 struct jffs2_raw_dirent *rd;
307 struct jffs2_full_dnode *fn;
308 struct jffs2_full_dirent *fd;
311 int ret, targetlen = strlen(target);
313 /* FIXME: If you care. We'd need to use frags for the target
314 if it grows much more than this */
316 return -ENAMETOOLONG;
318 ri = jffs2_alloc_raw_inode();
323 c = JFFS2_SB_INFO(dir_i->i_sb);
325 /* Try to reserve enough space for both node and dirent.
326 * Just the node will do for now, though
328 namelen = dentry->d_name.len;
329 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
330 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
333 jffs2_free_raw_inode(ri);
337 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
340 jffs2_free_raw_inode(ri);
341 jffs2_complete_reservation(c);
342 return PTR_ERR(inode);
345 inode->i_op = &jffs2_symlink_inode_operations;
347 f = JFFS2_INODE_INFO(inode);
349 inode->i_size = targetlen;
350 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
351 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
352 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
354 ri->compr = JFFS2_COMPR_NONE;
355 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
356 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
358 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
360 jffs2_free_raw_inode(ri);
363 /* Eeek. Wave bye bye */
364 mutex_unlock(&f->sem);
365 jffs2_complete_reservation(c);
370 /* We use f->target field to store the target path. */
371 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
373 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
374 mutex_unlock(&f->sem);
375 jffs2_complete_reservation(c);
380 memcpy(f->target, target, targetlen + 1);
381 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
383 /* No data here. Only a metadata node, which will be
384 obsoleted by the first data write
387 mutex_unlock(&f->sem);
389 jffs2_complete_reservation(c);
391 ret = jffs2_init_security(inode, dir_i);
395 ret = jffs2_init_acl_post(inode);
399 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
400 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
404 rd = jffs2_alloc_raw_dirent();
406 /* Argh. Now we treat it like a normal delete */
407 jffs2_complete_reservation(c);
412 dir_f = JFFS2_INODE_INFO(dir_i);
413 mutex_lock(&dir_f->sem);
415 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
416 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
417 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
418 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
420 rd->pino = cpu_to_je32(dir_i->i_ino);
421 rd->version = cpu_to_je32(++dir_f->highest_version);
422 rd->ino = cpu_to_je32(inode->i_ino);
423 rd->mctime = cpu_to_je32(get_seconds());
426 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
427 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
429 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
432 /* dirent failed to write. Delete the inode normally
433 as if it were the final unlink() */
434 jffs2_complete_reservation(c);
435 jffs2_free_raw_dirent(rd);
436 mutex_unlock(&dir_f->sem);
441 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
443 jffs2_free_raw_dirent(rd);
445 /* Link the fd into the inode's list, obsoleting an old
447 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
449 mutex_unlock(&dir_f->sem);
450 jffs2_complete_reservation(c);
452 d_instantiate(dentry, inode);
453 unlock_new_inode(inode);
457 make_bad_inode(inode);
458 unlock_new_inode(inode);
464 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
466 struct jffs2_inode_info *f, *dir_f;
467 struct jffs2_sb_info *c;
469 struct jffs2_raw_inode *ri;
470 struct jffs2_raw_dirent *rd;
471 struct jffs2_full_dnode *fn;
472 struct jffs2_full_dirent *fd;
479 ri = jffs2_alloc_raw_inode();
483 c = JFFS2_SB_INFO(dir_i->i_sb);
485 /* Try to reserve enough space for both node and dirent.
486 * Just the node will do for now, though
488 namelen = dentry->d_name.len;
489 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
490 JFFS2_SUMMARY_INODE_SIZE);
493 jffs2_free_raw_inode(ri);
497 inode = jffs2_new_inode(dir_i, mode, ri);
500 jffs2_free_raw_inode(ri);
501 jffs2_complete_reservation(c);
502 return PTR_ERR(inode);
505 inode->i_op = &jffs2_dir_inode_operations;
506 inode->i_fop = &jffs2_dir_operations;
508 f = JFFS2_INODE_INFO(inode);
510 /* Directories get nlink 2 at start */
512 /* but ic->pino_nlink is the parent ino# */
513 f->inocache->pino_nlink = dir_i->i_ino;
515 ri->data_crc = cpu_to_je32(0);
516 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
518 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
520 jffs2_free_raw_inode(ri);
523 /* Eeek. Wave bye bye */
524 mutex_unlock(&f->sem);
525 jffs2_complete_reservation(c);
529 /* No data here. Only a metadata node, which will be
530 obsoleted by the first data write
533 mutex_unlock(&f->sem);
535 jffs2_complete_reservation(c);
537 ret = jffs2_init_security(inode, dir_i);
541 ret = jffs2_init_acl_post(inode);
545 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
546 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
550 rd = jffs2_alloc_raw_dirent();
552 /* Argh. Now we treat it like a normal delete */
553 jffs2_complete_reservation(c);
558 dir_f = JFFS2_INODE_INFO(dir_i);
559 mutex_lock(&dir_f->sem);
561 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
562 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
563 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
564 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
566 rd->pino = cpu_to_je32(dir_i->i_ino);
567 rd->version = cpu_to_je32(++dir_f->highest_version);
568 rd->ino = cpu_to_je32(inode->i_ino);
569 rd->mctime = cpu_to_je32(get_seconds());
572 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
573 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
575 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
578 /* dirent failed to write. Delete the inode normally
579 as if it were the final unlink() */
580 jffs2_complete_reservation(c);
581 jffs2_free_raw_dirent(rd);
582 mutex_unlock(&dir_f->sem);
587 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
590 jffs2_free_raw_dirent(rd);
592 /* Link the fd into the inode's list, obsoleting an old
594 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
596 mutex_unlock(&dir_f->sem);
597 jffs2_complete_reservation(c);
599 d_instantiate(dentry, inode);
600 unlock_new_inode(inode);
604 make_bad_inode(inode);
605 unlock_new_inode(inode);
610 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
612 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
613 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
614 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
615 struct jffs2_full_dirent *fd;
617 uint32_t now = get_seconds();
619 for (fd = f->dents ; fd; fd = fd->next) {
624 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
625 dentry->d_name.len, f, now);
627 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
628 clear_nlink(dentry->d_inode);
634 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
636 struct jffs2_inode_info *f, *dir_f;
637 struct jffs2_sb_info *c;
639 struct jffs2_raw_inode *ri;
640 struct jffs2_raw_dirent *rd;
641 struct jffs2_full_dnode *fn;
642 struct jffs2_full_dirent *fd;
644 union jffs2_device_node dev;
649 if (!new_valid_dev(rdev))
652 ri = jffs2_alloc_raw_inode();
656 c = JFFS2_SB_INFO(dir_i->i_sb);
658 if (S_ISBLK(mode) || S_ISCHR(mode))
659 devlen = jffs2_encode_dev(&dev, rdev);
661 /* Try to reserve enough space for both node and dirent.
662 * Just the node will do for now, though
664 namelen = dentry->d_name.len;
665 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
666 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
669 jffs2_free_raw_inode(ri);
673 inode = jffs2_new_inode(dir_i, mode, ri);
676 jffs2_free_raw_inode(ri);
677 jffs2_complete_reservation(c);
678 return PTR_ERR(inode);
680 inode->i_op = &jffs2_file_inode_operations;
681 init_special_inode(inode, inode->i_mode, rdev);
683 f = JFFS2_INODE_INFO(inode);
685 ri->dsize = ri->csize = cpu_to_je32(devlen);
686 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
687 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
689 ri->compr = JFFS2_COMPR_NONE;
690 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
691 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
693 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
695 jffs2_free_raw_inode(ri);
698 /* Eeek. Wave bye bye */
699 mutex_unlock(&f->sem);
700 jffs2_complete_reservation(c);
704 /* No data here. Only a metadata node, which will be
705 obsoleted by the first data write
708 mutex_unlock(&f->sem);
710 jffs2_complete_reservation(c);
712 ret = jffs2_init_security(inode, dir_i);
716 ret = jffs2_init_acl_post(inode);
720 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
721 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
725 rd = jffs2_alloc_raw_dirent();
727 /* Argh. Now we treat it like a normal delete */
728 jffs2_complete_reservation(c);
733 dir_f = JFFS2_INODE_INFO(dir_i);
734 mutex_lock(&dir_f->sem);
736 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
737 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
738 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
739 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
741 rd->pino = cpu_to_je32(dir_i->i_ino);
742 rd->version = cpu_to_je32(++dir_f->highest_version);
743 rd->ino = cpu_to_je32(inode->i_ino);
744 rd->mctime = cpu_to_je32(get_seconds());
747 /* XXX: This is ugly. */
748 rd->type = (mode & S_IFMT) >> 12;
750 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
751 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
753 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
756 /* dirent failed to write. Delete the inode normally
757 as if it were the final unlink() */
758 jffs2_complete_reservation(c);
759 jffs2_free_raw_dirent(rd);
760 mutex_unlock(&dir_f->sem);
765 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
767 jffs2_free_raw_dirent(rd);
769 /* Link the fd into the inode's list, obsoleting an old
771 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
773 mutex_unlock(&dir_f->sem);
774 jffs2_complete_reservation(c);
776 d_instantiate(dentry, inode);
777 unlock_new_inode(inode);
781 make_bad_inode(inode);
782 unlock_new_inode(inode);
787 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
788 struct inode *new_dir_i, struct dentry *new_dentry)
791 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
792 struct jffs2_inode_info *victim_f = NULL;
796 /* The VFS will check for us and prevent trying to rename a
797 * file over a directory and vice versa, but if it's a directory,
798 * the VFS can't check whether the victim is empty. The filesystem
799 * needs to do that for itself.
801 if (new_dentry->d_inode) {
802 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
803 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
804 struct jffs2_full_dirent *fd;
806 mutex_lock(&victim_f->sem);
807 for (fd = victim_f->dents; fd; fd = fd->next) {
809 mutex_unlock(&victim_f->sem);
813 mutex_unlock(&victim_f->sem);
817 /* XXX: We probably ought to alloc enough space for
818 both nodes at the same time. Writing the new link,
819 then getting -ENOSPC, is quite bad :)
822 /* Make a hard link */
824 /* XXX: This is ugly */
825 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
826 if (!type) type = DT_REG;
829 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
830 old_dentry->d_inode->i_ino, type,
831 new_dentry->d_name.name, new_dentry->d_name.len, now);
837 /* There was a victim. Kill it off nicely */
838 drop_nlink(new_dentry->d_inode);
839 /* Don't oops if the victim was a dirent pointing to an
840 inode which didn't exist. */
841 if (victim_f->inocache) {
842 mutex_lock(&victim_f->sem);
843 if (S_ISDIR(new_dentry->d_inode->i_mode))
844 victim_f->inocache->pino_nlink = 0;
846 victim_f->inocache->pino_nlink--;
847 mutex_unlock(&victim_f->sem);
851 /* If it was a directory we moved, and there was no victim,
852 increase i_nlink on its new parent */
853 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
854 inc_nlink(new_dir_i);
856 /* Unlink the original */
857 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
858 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
860 /* We don't touch inode->i_nlink */
863 /* Oh shit. We really ought to make a single node which can do both atomically */
864 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
866 inc_nlink(old_dentry->d_inode);
867 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
868 f->inocache->pino_nlink++;
869 mutex_unlock(&f->sem);
871 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
872 /* Might as well let the VFS know */
873 d_instantiate(new_dentry, old_dentry->d_inode);
874 atomic_inc(&old_dentry->d_inode->i_count);
875 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
879 if (S_ISDIR(old_dentry->d_inode->i_mode))
880 drop_nlink(old_dir_i);
882 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);