2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
7 * Created by David Woodhouse <dwmw2@infradead.org>
9 * For licensing information, see the file 'LICENCE' in this directory.
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
16 #include <linux/crc32.h>
17 #include <linux/jffs2.h>
18 #include "jffs2_fs_i.h"
19 #include "jffs2_fs_sb.h"
20 #include <linux/time.h>
23 static int jffs2_readdir (struct file *, void *, filldir_t);
25 static int jffs2_create (struct inode *,struct dentry *,int,
27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
30 static int jffs2_unlink (struct inode *,struct dentry *);
31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
32 static int jffs2_mkdir (struct inode *,struct dentry *,int);
33 static int jffs2_rmdir (struct inode *,struct dentry *);
34 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
35 static int jffs2_rename (struct inode *, struct dentry *,
36 struct inode *, struct dentry *);
38 const struct file_operations jffs2_dir_operations =
40 .read = generic_read_dir,
41 .readdir = jffs2_readdir,
42 .unlocked_ioctl=jffs2_ioctl,
44 .llseek = generic_file_llseek,
48 const struct inode_operations jffs2_dir_inode_operations =
50 .create = jffs2_create,
51 .lookup = jffs2_lookup,
53 .unlink = jffs2_unlink,
54 .symlink = jffs2_symlink,
58 .rename = jffs2_rename,
59 .check_acl = jffs2_check_acl,
60 .setattr = jffs2_setattr,
61 .setxattr = jffs2_setxattr,
62 .getxattr = jffs2_getxattr,
63 .listxattr = jffs2_listxattr,
64 .removexattr = jffs2_removexattr
67 /***********************************************************************/
70 /* We keep the dirent list sorted in increasing order of name hash,
71 and we use the same hash function as the dentries. Makes this
74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
77 struct jffs2_inode_info *dir_f;
78 struct jffs2_sb_info *c;
79 struct jffs2_full_dirent *fd = NULL, *fd_list;
81 struct inode *inode = NULL;
83 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
85 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
86 return ERR_PTR(-ENAMETOOLONG);
88 dir_f = JFFS2_INODE_INFO(dir_i);
89 c = JFFS2_SB_INFO(dir_i->i_sb);
91 mutex_lock(&dir_f->sem);
93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
94 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
95 if (fd_list->nhash == target->d_name.hash &&
96 (!fd || fd_list->version > fd->version) &&
97 strlen(fd_list->name) == target->d_name.len &&
98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
104 mutex_unlock(&dir_f->sem);
106 inode = jffs2_iget(dir_i->i_sb, ino);
108 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
109 return ERR_CAST(inode);
113 return d_splice_alias(inode, target);
116 /***********************************************************************/
119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
121 struct jffs2_inode_info *f;
122 struct jffs2_sb_info *c;
123 struct inode *inode = filp->f_path.dentry->d_inode;
124 struct jffs2_full_dirent *fd;
125 unsigned long offset, curofs;
127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
129 f = JFFS2_INODE_INFO(inode);
130 c = JFFS2_SB_INFO(inode->i_sb);
132 offset = filp->f_pos;
135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
141 unsigned long pino = parent_ino(filp->f_path.dentry);
142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
150 for (fd = f->dents; fd; fd = fd->next) {
153 /* First loop: curofs = 2; offset = 2 */
154 if (curofs < offset) {
155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
156 fd->name, fd->ino, fd->type, curofs, offset));
160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
169 mutex_unlock(&f->sem);
171 filp->f_pos = offset;
175 /***********************************************************************/
178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
179 struct nameidata *nd)
181 struct jffs2_raw_inode *ri;
182 struct jffs2_inode_info *f, *dir_f;
183 struct jffs2_sb_info *c;
187 ri = jffs2_alloc_raw_inode();
191 c = JFFS2_SB_INFO(dir_i->i_sb);
193 D1(printk(KERN_DEBUG "jffs2_create()\n"));
195 inode = jffs2_new_inode(dir_i, mode, ri);
198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
199 jffs2_free_raw_inode(ri);
200 return PTR_ERR(inode);
203 inode->i_op = &jffs2_file_inode_operations;
204 inode->i_fop = &jffs2_file_operations;
205 inode->i_mapping->a_ops = &jffs2_file_address_operations;
206 inode->i_mapping->nrpages = 0;
208 f = JFFS2_INODE_INFO(inode);
209 dir_f = JFFS2_INODE_INFO(dir_i);
211 /* jffs2_do_create() will want to lock it, _after_ reserving
212 space and taking c-alloc_sem. If we keep it locked here,
213 lockdep gets unhappy (although it's a false positive;
214 nothing else will be looking at this inode yet so there's
215 no chance of AB-BA deadlock involving its f->sem). */
216 mutex_unlock(&f->sem);
218 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
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);
236 jffs2_free_raw_inode(ri);
240 /***********************************************************************/
243 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
245 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
247 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
249 uint32_t now = get_seconds();
251 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
252 dentry->d_name.len, dead_f, now);
253 if (dead_f->inocache)
254 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
259 /***********************************************************************/
262 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
264 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
265 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
266 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
271 /* Don't let people make hard links to bad inodes. */
275 if (S_ISDIR(old_dentry->d_inode->i_mode))
278 /* XXX: This is ugly */
279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
280 if (!type) type = DT_REG;
283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
287 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
288 mutex_unlock(&f->sem);
289 d_instantiate(dentry, old_dentry->d_inode);
290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
291 ihold(old_dentry->d_inode);
296 /***********************************************************************/
298 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
300 struct jffs2_inode_info *f, *dir_f;
301 struct jffs2_sb_info *c;
303 struct jffs2_raw_inode *ri;
304 struct jffs2_raw_dirent *rd;
305 struct jffs2_full_dnode *fn;
306 struct jffs2_full_dirent *fd;
309 int ret, targetlen = strlen(target);
311 /* FIXME: If you care. We'd need to use frags for the target
312 if it grows much more than this */
314 return -ENAMETOOLONG;
316 ri = jffs2_alloc_raw_inode();
321 c = JFFS2_SB_INFO(dir_i->i_sb);
323 /* Try to reserve enough space for both node and dirent.
324 * Just the node will do for now, though
326 namelen = dentry->d_name.len;
327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
331 jffs2_free_raw_inode(ri);
335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
338 jffs2_free_raw_inode(ri);
339 jffs2_complete_reservation(c);
340 return PTR_ERR(inode);
343 inode->i_op = &jffs2_symlink_inode_operations;
345 f = JFFS2_INODE_INFO(inode);
347 inode->i_size = targetlen;
348 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
349 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
350 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
352 ri->compr = JFFS2_COMPR_NONE;
353 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
354 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
358 jffs2_free_raw_inode(ri);
361 /* Eeek. Wave bye bye */
362 mutex_unlock(&f->sem);
363 jffs2_complete_reservation(c);
368 /* We use f->target field to store the target path. */
369 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
372 mutex_unlock(&f->sem);
373 jffs2_complete_reservation(c);
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, &dentry->d_name);
392 ret = jffs2_init_acl_post(inode);
396 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
397 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
401 rd = jffs2_alloc_raw_dirent();
403 /* Argh. Now we treat it like a normal delete */
404 jffs2_complete_reservation(c);
409 dir_f = JFFS2_INODE_INFO(dir_i);
410 mutex_lock(&dir_f->sem);
412 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
413 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
414 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
415 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
417 rd->pino = cpu_to_je32(dir_i->i_ino);
418 rd->version = cpu_to_je32(++dir_f->highest_version);
419 rd->ino = cpu_to_je32(inode->i_ino);
420 rd->mctime = cpu_to_je32(get_seconds());
423 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
424 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
426 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
429 /* dirent failed to write. Delete the inode normally
430 as if it were the final unlink() */
431 jffs2_complete_reservation(c);
432 jffs2_free_raw_dirent(rd);
433 mutex_unlock(&dir_f->sem);
438 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
440 jffs2_free_raw_dirent(rd);
442 /* Link the fd into the inode's list, obsoleting an old
444 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
446 mutex_unlock(&dir_f->sem);
447 jffs2_complete_reservation(c);
449 d_instantiate(dentry, inode);
450 unlock_new_inode(inode);
459 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
461 struct jffs2_inode_info *f, *dir_f;
462 struct jffs2_sb_info *c;
464 struct jffs2_raw_inode *ri;
465 struct jffs2_raw_dirent *rd;
466 struct jffs2_full_dnode *fn;
467 struct jffs2_full_dirent *fd;
474 ri = jffs2_alloc_raw_inode();
478 c = JFFS2_SB_INFO(dir_i->i_sb);
480 /* Try to reserve enough space for both node and dirent.
481 * Just the node will do for now, though
483 namelen = dentry->d_name.len;
484 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
485 JFFS2_SUMMARY_INODE_SIZE);
488 jffs2_free_raw_inode(ri);
492 inode = jffs2_new_inode(dir_i, mode, ri);
495 jffs2_free_raw_inode(ri);
496 jffs2_complete_reservation(c);
497 return PTR_ERR(inode);
500 inode->i_op = &jffs2_dir_inode_operations;
501 inode->i_fop = &jffs2_dir_operations;
503 f = JFFS2_INODE_INFO(inode);
505 /* Directories get nlink 2 at start */
507 /* but ic->pino_nlink is the parent ino# */
508 f->inocache->pino_nlink = dir_i->i_ino;
510 ri->data_crc = cpu_to_je32(0);
511 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
513 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
515 jffs2_free_raw_inode(ri);
518 /* Eeek. Wave bye bye */
519 mutex_unlock(&f->sem);
520 jffs2_complete_reservation(c);
524 /* No data here. Only a metadata node, which will be
525 obsoleted by the first data write
528 mutex_unlock(&f->sem);
530 jffs2_complete_reservation(c);
532 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
536 ret = jffs2_init_acl_post(inode);
540 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
541 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
545 rd = jffs2_alloc_raw_dirent();
547 /* Argh. Now we treat it like a normal delete */
548 jffs2_complete_reservation(c);
553 dir_f = JFFS2_INODE_INFO(dir_i);
554 mutex_lock(&dir_f->sem);
556 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
557 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
558 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
559 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
561 rd->pino = cpu_to_je32(dir_i->i_ino);
562 rd->version = cpu_to_je32(++dir_f->highest_version);
563 rd->ino = cpu_to_je32(inode->i_ino);
564 rd->mctime = cpu_to_je32(get_seconds());
567 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
568 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
570 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
573 /* dirent failed to write. Delete the inode normally
574 as if it were the final unlink() */
575 jffs2_complete_reservation(c);
576 jffs2_free_raw_dirent(rd);
577 mutex_unlock(&dir_f->sem);
582 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
585 jffs2_free_raw_dirent(rd);
587 /* Link the fd into the inode's list, obsoleting an old
589 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
591 mutex_unlock(&dir_f->sem);
592 jffs2_complete_reservation(c);
594 d_instantiate(dentry, inode);
595 unlock_new_inode(inode);
603 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
605 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
606 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
608 struct jffs2_full_dirent *fd;
610 uint32_t now = get_seconds();
612 dentry_unhash(dentry);
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);
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, &dentry->d_name);
711 ret = jffs2_init_acl_post(inode);
715 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
716 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
720 rd = jffs2_alloc_raw_dirent();
722 /* Argh. Now we treat it like a normal delete */
723 jffs2_complete_reservation(c);
728 dir_f = JFFS2_INODE_INFO(dir_i);
729 mutex_lock(&dir_f->sem);
731 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
732 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
733 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
734 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
736 rd->pino = cpu_to_je32(dir_i->i_ino);
737 rd->version = cpu_to_je32(++dir_f->highest_version);
738 rd->ino = cpu_to_je32(inode->i_ino);
739 rd->mctime = cpu_to_je32(get_seconds());
742 /* XXX: This is ugly. */
743 rd->type = (mode & S_IFMT) >> 12;
745 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
746 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
748 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
751 /* dirent failed to write. Delete the inode normally
752 as if it were the final unlink() */
753 jffs2_complete_reservation(c);
754 jffs2_free_raw_dirent(rd);
755 mutex_unlock(&dir_f->sem);
760 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
762 jffs2_free_raw_dirent(rd);
764 /* Link the fd into the inode's list, obsoleting an old
766 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
768 mutex_unlock(&dir_f->sem);
769 jffs2_complete_reservation(c);
771 d_instantiate(dentry, inode);
772 unlock_new_inode(inode);
780 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
781 struct inode *new_dir_i, struct dentry *new_dentry)
784 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
785 struct jffs2_inode_info *victim_f = NULL;
789 if (new_dentry->d_inode && S_ISDIR(new_dentry->d_inode->i_mode))
790 dentry_unhash(new_dentry);
792 /* The VFS will check for us and prevent trying to rename a
793 * file over a directory and vice versa, but if it's a directory,
794 * the VFS can't check whether the victim is empty. The filesystem
795 * needs to do that for itself.
797 if (new_dentry->d_inode) {
798 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
799 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
800 struct jffs2_full_dirent *fd;
802 mutex_lock(&victim_f->sem);
803 for (fd = victim_f->dents; fd; fd = fd->next) {
805 mutex_unlock(&victim_f->sem);
809 mutex_unlock(&victim_f->sem);
813 /* XXX: We probably ought to alloc enough space for
814 both nodes at the same time. Writing the new link,
815 then getting -ENOSPC, is quite bad :)
818 /* Make a hard link */
820 /* XXX: This is ugly */
821 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
822 if (!type) type = DT_REG;
825 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
826 old_dentry->d_inode->i_ino, type,
827 new_dentry->d_name.name, new_dentry->d_name.len, now);
833 /* There was a victim. Kill it off nicely */
834 drop_nlink(new_dentry->d_inode);
835 /* Don't oops if the victim was a dirent pointing to an
836 inode which didn't exist. */
837 if (victim_f->inocache) {
838 mutex_lock(&victim_f->sem);
839 if (S_ISDIR(new_dentry->d_inode->i_mode))
840 victim_f->inocache->pino_nlink = 0;
842 victim_f->inocache->pino_nlink--;
843 mutex_unlock(&victim_f->sem);
847 /* If it was a directory we moved, and there was no victim,
848 increase i_nlink on its new parent */
849 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
850 inc_nlink(new_dir_i);
852 /* Unlink the original */
853 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
854 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
856 /* We don't touch inode->i_nlink */
859 /* Oh shit. We really ought to make a single node which can do both atomically */
860 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
862 inc_nlink(old_dentry->d_inode);
863 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
864 f->inocache->pino_nlink++;
865 mutex_unlock(&f->sem);
867 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
868 /* Might as well let the VFS know */
869 d_instantiate(new_dentry, old_dentry->d_inode);
870 ihold(old_dentry->d_inode);
871 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
875 if (S_ISDIR(old_dentry->d_inode->i_mode))
876 drop_nlink(old_dir_i);
878 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);