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 .permission = jffs2_permission,
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);
225 d_instantiate(dentry, inode);
227 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
228 inode->i_ino, inode->i_mode, inode->i_nlink,
229 f->inocache->pino_nlink, inode->i_mapping->nrpages));
233 make_bad_inode(inode);
235 jffs2_free_raw_inode(ri);
239 /***********************************************************************/
242 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
248 uint32_t now = get_seconds();
250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
251 dentry->d_name.len, dead_f, now);
252 if (dead_f->inocache)
253 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
258 /***********************************************************************/
261 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
270 /* Don't let people make hard links to bad inodes. */
274 if (S_ISDIR(old_dentry->d_inode->i_mode))
277 /* XXX: This is ugly */
278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
279 if (!type) type = DT_REG;
282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
286 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
287 mutex_unlock(&f->sem);
288 d_instantiate(dentry, old_dentry->d_inode);
289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
290 atomic_inc(&old_dentry->d_inode->i_count);
295 /***********************************************************************/
297 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
299 struct jffs2_inode_info *f, *dir_f;
300 struct jffs2_sb_info *c;
302 struct jffs2_raw_inode *ri;
303 struct jffs2_raw_dirent *rd;
304 struct jffs2_full_dnode *fn;
305 struct jffs2_full_dirent *fd;
308 int ret, targetlen = strlen(target);
310 /* FIXME: If you care. We'd need to use frags for the target
311 if it grows much more than this */
313 return -ENAMETOOLONG;
315 ri = jffs2_alloc_raw_inode();
320 c = JFFS2_SB_INFO(dir_i->i_sb);
322 /* Try to reserve enough space for both node and dirent.
323 * Just the node will do for now, though
325 namelen = dentry->d_name.len;
326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
330 jffs2_free_raw_inode(ri);
334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
337 jffs2_free_raw_inode(ri);
338 jffs2_complete_reservation(c);
339 return PTR_ERR(inode);
342 inode->i_op = &jffs2_symlink_inode_operations;
344 f = JFFS2_INODE_INFO(inode);
346 inode->i_size = targetlen;
347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
351 ri->compr = JFFS2_COMPR_NONE;
352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
357 jffs2_free_raw_inode(ri);
360 /* Eeek. Wave bye bye */
361 mutex_unlock(&f->sem);
362 jffs2_complete_reservation(c);
363 jffs2_clear_inode(inode);
367 /* We use f->target field to store the target path. */
368 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
370 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
371 mutex_unlock(&f->sem);
372 jffs2_complete_reservation(c);
373 jffs2_clear_inode(inode);
377 memcpy(f->target, target, targetlen + 1);
378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
380 /* No data here. Only a metadata node, which will be
381 obsoleted by the first data write
384 mutex_unlock(&f->sem);
386 jffs2_complete_reservation(c);
388 ret = jffs2_init_security(inode, dir_i);
390 jffs2_clear_inode(inode);
393 ret = jffs2_init_acl_post(inode);
395 jffs2_clear_inode(inode);
399 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
400 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
403 jffs2_clear_inode(inode);
407 rd = jffs2_alloc_raw_dirent();
409 /* Argh. Now we treat it like a normal delete */
410 jffs2_complete_reservation(c);
411 jffs2_clear_inode(inode);
415 dir_f = JFFS2_INODE_INFO(dir_i);
416 mutex_lock(&dir_f->sem);
418 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
419 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
420 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
421 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
423 rd->pino = cpu_to_je32(dir_i->i_ino);
424 rd->version = cpu_to_je32(++dir_f->highest_version);
425 rd->ino = cpu_to_je32(inode->i_ino);
426 rd->mctime = cpu_to_je32(get_seconds());
429 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
430 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
432 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
435 /* dirent failed to write. Delete the inode normally
436 as if it were the final unlink() */
437 jffs2_complete_reservation(c);
438 jffs2_free_raw_dirent(rd);
439 mutex_unlock(&dir_f->sem);
440 jffs2_clear_inode(inode);
444 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
446 jffs2_free_raw_dirent(rd);
448 /* Link the fd into the inode's list, obsoleting an old
450 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
452 mutex_unlock(&dir_f->sem);
453 jffs2_complete_reservation(c);
455 d_instantiate(dentry, inode);
460 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
462 struct jffs2_inode_info *f, *dir_f;
463 struct jffs2_sb_info *c;
465 struct jffs2_raw_inode *ri;
466 struct jffs2_raw_dirent *rd;
467 struct jffs2_full_dnode *fn;
468 struct jffs2_full_dirent *fd;
475 ri = jffs2_alloc_raw_inode();
479 c = JFFS2_SB_INFO(dir_i->i_sb);
481 /* Try to reserve enough space for both node and dirent.
482 * Just the node will do for now, though
484 namelen = dentry->d_name.len;
485 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
486 JFFS2_SUMMARY_INODE_SIZE);
489 jffs2_free_raw_inode(ri);
493 inode = jffs2_new_inode(dir_i, mode, ri);
496 jffs2_free_raw_inode(ri);
497 jffs2_complete_reservation(c);
498 return PTR_ERR(inode);
501 inode->i_op = &jffs2_dir_inode_operations;
502 inode->i_fop = &jffs2_dir_operations;
504 f = JFFS2_INODE_INFO(inode);
506 /* Directories get nlink 2 at start */
508 /* but ic->pino_nlink is the parent ino# */
509 f->inocache->pino_nlink = dir_i->i_ino;
511 ri->data_crc = cpu_to_je32(0);
512 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
514 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
516 jffs2_free_raw_inode(ri);
519 /* Eeek. Wave bye bye */
520 mutex_unlock(&f->sem);
521 jffs2_complete_reservation(c);
522 jffs2_clear_inode(inode);
525 /* No data here. Only a metadata node, which will be
526 obsoleted by the first data write
529 mutex_unlock(&f->sem);
531 jffs2_complete_reservation(c);
533 ret = jffs2_init_security(inode, dir_i);
535 jffs2_clear_inode(inode);
538 ret = jffs2_init_acl_post(inode);
540 jffs2_clear_inode(inode);
544 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
545 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
548 jffs2_clear_inode(inode);
552 rd = jffs2_alloc_raw_dirent();
554 /* Argh. Now we treat it like a normal delete */
555 jffs2_complete_reservation(c);
556 jffs2_clear_inode(inode);
560 dir_f = JFFS2_INODE_INFO(dir_i);
561 mutex_lock(&dir_f->sem);
563 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
564 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
565 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
566 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
568 rd->pino = cpu_to_je32(dir_i->i_ino);
569 rd->version = cpu_to_je32(++dir_f->highest_version);
570 rd->ino = cpu_to_je32(inode->i_ino);
571 rd->mctime = cpu_to_je32(get_seconds());
574 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
575 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
577 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
580 /* dirent failed to write. Delete the inode normally
581 as if it were the final unlink() */
582 jffs2_complete_reservation(c);
583 jffs2_free_raw_dirent(rd);
584 mutex_unlock(&dir_f->sem);
585 jffs2_clear_inode(inode);
589 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
592 jffs2_free_raw_dirent(rd);
594 /* Link the fd into the inode's list, obsoleting an old
596 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
598 mutex_unlock(&dir_f->sem);
599 jffs2_complete_reservation(c);
601 d_instantiate(dentry, inode);
605 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
607 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
608 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
609 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
610 struct jffs2_full_dirent *fd;
612 uint32_t now = get_seconds();
614 for (fd = f->dents ; fd; fd = fd->next) {
619 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
620 dentry->d_name.len, f, now);
622 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
623 clear_nlink(dentry->d_inode);
629 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
631 struct jffs2_inode_info *f, *dir_f;
632 struct jffs2_sb_info *c;
634 struct jffs2_raw_inode *ri;
635 struct jffs2_raw_dirent *rd;
636 struct jffs2_full_dnode *fn;
637 struct jffs2_full_dirent *fd;
639 union jffs2_device_node dev;
644 if (!new_valid_dev(rdev))
647 ri = jffs2_alloc_raw_inode();
651 c = JFFS2_SB_INFO(dir_i->i_sb);
653 if (S_ISBLK(mode) || S_ISCHR(mode))
654 devlen = jffs2_encode_dev(&dev, rdev);
656 /* Try to reserve enough space for both node and dirent.
657 * Just the node will do for now, though
659 namelen = dentry->d_name.len;
660 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
661 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
664 jffs2_free_raw_inode(ri);
668 inode = jffs2_new_inode(dir_i, mode, ri);
671 jffs2_free_raw_inode(ri);
672 jffs2_complete_reservation(c);
673 return PTR_ERR(inode);
675 inode->i_op = &jffs2_file_inode_operations;
676 init_special_inode(inode, inode->i_mode, rdev);
678 f = JFFS2_INODE_INFO(inode);
680 ri->dsize = ri->csize = cpu_to_je32(devlen);
681 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
682 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
684 ri->compr = JFFS2_COMPR_NONE;
685 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
686 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
688 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
690 jffs2_free_raw_inode(ri);
693 /* Eeek. Wave bye bye */
694 mutex_unlock(&f->sem);
695 jffs2_complete_reservation(c);
696 jffs2_clear_inode(inode);
699 /* No data here. Only a metadata node, which will be
700 obsoleted by the first data write
703 mutex_unlock(&f->sem);
705 jffs2_complete_reservation(c);
707 ret = jffs2_init_security(inode, dir_i);
709 jffs2_clear_inode(inode);
712 ret = jffs2_init_acl_post(inode);
714 jffs2_clear_inode(inode);
718 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
719 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
722 jffs2_clear_inode(inode);
726 rd = jffs2_alloc_raw_dirent();
728 /* Argh. Now we treat it like a normal delete */
729 jffs2_complete_reservation(c);
730 jffs2_clear_inode(inode);
734 dir_f = JFFS2_INODE_INFO(dir_i);
735 mutex_lock(&dir_f->sem);
737 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
738 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
739 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
740 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
742 rd->pino = cpu_to_je32(dir_i->i_ino);
743 rd->version = cpu_to_je32(++dir_f->highest_version);
744 rd->ino = cpu_to_je32(inode->i_ino);
745 rd->mctime = cpu_to_je32(get_seconds());
748 /* XXX: This is ugly. */
749 rd->type = (mode & S_IFMT) >> 12;
751 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
752 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
754 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
757 /* dirent failed to write. Delete the inode normally
758 as if it were the final unlink() */
759 jffs2_complete_reservation(c);
760 jffs2_free_raw_dirent(rd);
761 mutex_unlock(&dir_f->sem);
762 jffs2_clear_inode(inode);
766 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
768 jffs2_free_raw_dirent(rd);
770 /* Link the fd into the inode's list, obsoleting an old
772 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
774 mutex_unlock(&dir_f->sem);
775 jffs2_complete_reservation(c);
777 d_instantiate(dentry, inode);
782 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
783 struct inode *new_dir_i, struct dentry *new_dentry)
786 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
787 struct jffs2_inode_info *victim_f = NULL;
791 /* The VFS will check for us and prevent trying to rename a
792 * file over a directory and vice versa, but if it's a directory,
793 * the VFS can't check whether the victim is empty. The filesystem
794 * needs to do that for itself.
796 if (new_dentry->d_inode) {
797 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
798 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
799 struct jffs2_full_dirent *fd;
801 mutex_lock(&victim_f->sem);
802 for (fd = victim_f->dents; fd; fd = fd->next) {
804 mutex_unlock(&victim_f->sem);
808 mutex_unlock(&victim_f->sem);
812 /* XXX: We probably ought to alloc enough space for
813 both nodes at the same time. Writing the new link,
814 then getting -ENOSPC, is quite bad :)
817 /* Make a hard link */
819 /* XXX: This is ugly */
820 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
821 if (!type) type = DT_REG;
824 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
825 old_dentry->d_inode->i_ino, type,
826 new_dentry->d_name.name, new_dentry->d_name.len, now);
832 /* There was a victim. Kill it off nicely */
833 drop_nlink(new_dentry->d_inode);
834 /* Don't oops if the victim was a dirent pointing to an
835 inode which didn't exist. */
836 if (victim_f->inocache) {
837 mutex_lock(&victim_f->sem);
838 if (S_ISDIR(new_dentry->d_inode->i_mode))
839 victim_f->inocache->pino_nlink = 0;
841 victim_f->inocache->pino_nlink--;
842 mutex_unlock(&victim_f->sem);
846 /* If it was a directory we moved, and there was no victim,
847 increase i_nlink on its new parent */
848 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
849 inc_nlink(new_dir_i);
851 /* Unlink the original */
852 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
853 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
855 /* We don't touch inode->i_nlink */
858 /* Oh shit. We really ought to make a single node which can do both atomically */
859 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
861 inc_nlink(old_dentry->d_inode);
862 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
863 f->inocache->pino_nlink++;
864 mutex_unlock(&f->sem);
866 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
867 /* Might as well let the VFS know */
868 d_instantiate(new_dentry, old_dentry->d_inode);
869 atomic_inc(&old_dentry->d_inode->i_count);
870 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
874 if (S_ISDIR(old_dentry->d_inode->i_mode))
875 drop_nlink(old_dir_i);
877 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);