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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
18 #include <linux/crc32.h>
19 #include <linux/jffs2.h>
20 #include "jffs2_fs_i.h"
21 #include "jffs2_fs_sb.h"
22 #include <linux/time.h>
25 static int jffs2_readdir (struct file *, struct dir_context *);
27 static int jffs2_create (struct user_namespace *, struct inode *,
28 struct dentry *, umode_t, bool);
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 user_namespace *, struct inode *,
34 struct dentry *, const char *);
35 static int jffs2_mkdir (struct user_namespace *, struct inode *,struct dentry *,
37 static int jffs2_rmdir (struct inode *,struct dentry *);
38 static int jffs2_mknod (struct user_namespace *, struct inode *,struct dentry *,
40 static int jffs2_rename (struct user_namespace *, struct inode *,
41 struct dentry *, struct inode *, struct dentry *,
44 const struct file_operations jffs2_dir_operations =
46 .read = generic_read_dir,
47 .iterate_shared=jffs2_readdir,
48 .unlocked_ioctl=jffs2_ioctl,
50 .llseek = generic_file_llseek,
54 const struct inode_operations jffs2_dir_inode_operations =
56 .create = jffs2_create,
57 .lookup = jffs2_lookup,
59 .unlink = jffs2_unlink,
60 .symlink = jffs2_symlink,
64 .rename = jffs2_rename,
65 .get_acl = jffs2_get_acl,
66 .set_acl = jffs2_set_acl,
67 .setattr = jffs2_setattr,
68 .listxattr = jffs2_listxattr,
71 /***********************************************************************/
74 /* We keep the dirent list sorted in increasing order of name hash,
75 and we use the same hash function as the dentries. Makes this
78 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
81 struct jffs2_inode_info *dir_f;
82 struct jffs2_full_dirent *fd = NULL, *fd_list;
84 struct inode *inode = NULL;
87 jffs2_dbg(1, "jffs2_lookup()\n");
89 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
90 return ERR_PTR(-ENAMETOOLONG);
92 dir_f = JFFS2_INODE_INFO(dir_i);
94 /* The 'nhash' on the fd_list is not the same as the dentry hash */
95 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
97 mutex_lock(&dir_f->sem);
99 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
100 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
101 if (fd_list->nhash == nhash &&
102 (!fd || fd_list->version > fd->version) &&
103 strlen(fd_list->name) == target->d_name.len &&
104 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
110 mutex_unlock(&dir_f->sem);
112 inode = jffs2_iget(dir_i->i_sb, ino);
114 pr_warn("iget() failed for ino #%u\n", ino);
117 return d_splice_alias(inode, target);
120 /***********************************************************************/
123 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
125 struct inode *inode = file_inode(file);
126 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
127 struct jffs2_full_dirent *fd;
128 unsigned long curofs = 1;
130 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
132 if (!dir_emit_dots(file, ctx))
136 for (fd = f->dents; fd; fd = fd->next) {
138 /* First loop: curofs = 2; pos = 2 */
139 if (curofs < ctx->pos) {
140 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
141 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
145 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
150 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
151 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
152 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
156 mutex_unlock(&f->sem);
160 /***********************************************************************/
163 static int jffs2_create(struct user_namespace *mnt_userns, struct inode *dir_i,
164 struct dentry *dentry, umode_t mode, bool excl)
166 struct jffs2_raw_inode *ri;
167 struct jffs2_inode_info *f, *dir_f;
168 struct jffs2_sb_info *c;
172 ri = jffs2_alloc_raw_inode();
176 c = JFFS2_SB_INFO(dir_i->i_sb);
178 jffs2_dbg(1, "%s()\n", __func__);
180 inode = jffs2_new_inode(dir_i, mode, ri);
183 jffs2_dbg(1, "jffs2_new_inode() failed\n");
184 jffs2_free_raw_inode(ri);
185 return PTR_ERR(inode);
188 inode->i_op = &jffs2_file_inode_operations;
189 inode->i_fop = &jffs2_file_operations;
190 inode->i_mapping->a_ops = &jffs2_file_address_operations;
191 inode->i_mapping->nrpages = 0;
193 f = JFFS2_INODE_INFO(inode);
194 dir_f = JFFS2_INODE_INFO(dir_i);
196 /* jffs2_do_create() will want to lock it, _after_ reserving
197 space and taking c-alloc_sem. If we keep it locked here,
198 lockdep gets unhappy (although it's a false positive;
199 nothing else will be looking at this inode yet so there's
200 no chance of AB-BA deadlock involving its f->sem). */
201 mutex_unlock(&f->sem);
203 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
207 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
209 jffs2_free_raw_inode(ri);
211 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
212 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
213 f->inocache->pino_nlink, inode->i_mapping->nrpages);
215 d_instantiate_new(dentry, inode);
220 jffs2_free_raw_inode(ri);
224 /***********************************************************************/
227 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
229 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
230 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
231 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
233 uint32_t now = JFFS2_NOW();
235 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
236 dentry->d_name.len, dead_f, now);
237 if (dead_f->inocache)
238 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
240 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
243 /***********************************************************************/
246 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
248 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
249 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
250 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
255 /* Don't let people make hard links to bad inodes. */
259 if (d_is_dir(old_dentry))
262 /* XXX: This is ugly */
263 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
264 if (!type) type = DT_REG;
267 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
271 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
272 mutex_unlock(&f->sem);
273 d_instantiate(dentry, d_inode(old_dentry));
274 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
275 ihold(d_inode(old_dentry));
280 /***********************************************************************/
282 static int jffs2_symlink (struct user_namespace *mnt_userns, struct inode *dir_i,
283 struct dentry *dentry, const char *target)
285 struct jffs2_inode_info *f, *dir_f;
286 struct jffs2_sb_info *c;
288 struct jffs2_raw_inode *ri;
289 struct jffs2_raw_dirent *rd;
290 struct jffs2_full_dnode *fn;
291 struct jffs2_full_dirent *fd;
294 int ret, targetlen = strlen(target);
296 /* FIXME: If you care. We'd need to use frags for the target
297 if it grows much more than this */
299 return -ENAMETOOLONG;
301 ri = jffs2_alloc_raw_inode();
306 c = JFFS2_SB_INFO(dir_i->i_sb);
308 /* Try to reserve enough space for both node and dirent.
309 * Just the node will do for now, though
311 namelen = dentry->d_name.len;
312 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
313 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
316 jffs2_free_raw_inode(ri);
320 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
323 jffs2_free_raw_inode(ri);
324 jffs2_complete_reservation(c);
325 return PTR_ERR(inode);
328 inode->i_op = &jffs2_symlink_inode_operations;
330 f = JFFS2_INODE_INFO(inode);
332 inode->i_size = targetlen;
333 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
334 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
335 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
337 ri->compr = JFFS2_COMPR_NONE;
338 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
339 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
341 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
343 jffs2_free_raw_inode(ri);
346 /* Eeek. Wave bye bye */
347 mutex_unlock(&f->sem);
348 jffs2_complete_reservation(c);
353 /* We use f->target field to store the target path. */
354 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
356 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
357 mutex_unlock(&f->sem);
358 jffs2_complete_reservation(c);
362 inode->i_link = f->target;
364 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
365 __func__, (char *)f->target);
367 /* No data here. Only a metadata node, which will be
368 obsoleted by the first data write
371 mutex_unlock(&f->sem);
373 jffs2_complete_reservation(c);
375 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
379 ret = jffs2_init_acl_post(inode);
383 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
384 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
388 rd = jffs2_alloc_raw_dirent();
390 /* Argh. Now we treat it like a normal delete */
391 jffs2_complete_reservation(c);
396 dir_f = JFFS2_INODE_INFO(dir_i);
397 mutex_lock(&dir_f->sem);
399 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
400 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
401 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
402 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
404 rd->pino = cpu_to_je32(dir_i->i_ino);
405 rd->version = cpu_to_je32(++dir_f->highest_version);
406 rd->ino = cpu_to_je32(inode->i_ino);
407 rd->mctime = cpu_to_je32(JFFS2_NOW());
410 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
411 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
413 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
416 /* dirent failed to write. Delete the inode normally
417 as if it were the final unlink() */
418 jffs2_complete_reservation(c);
419 jffs2_free_raw_dirent(rd);
420 mutex_unlock(&dir_f->sem);
425 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
427 jffs2_free_raw_dirent(rd);
429 /* Link the fd into the inode's list, obsoleting an old
431 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
433 mutex_unlock(&dir_f->sem);
434 jffs2_complete_reservation(c);
436 d_instantiate_new(dentry, inode);
445 static int jffs2_mkdir (struct user_namespace *mnt_userns, struct inode *dir_i,
446 struct dentry *dentry, umode_t mode)
448 struct jffs2_inode_info *f, *dir_f;
449 struct jffs2_sb_info *c;
451 struct jffs2_raw_inode *ri;
452 struct jffs2_raw_dirent *rd;
453 struct jffs2_full_dnode *fn;
454 struct jffs2_full_dirent *fd;
461 ri = jffs2_alloc_raw_inode();
465 c = JFFS2_SB_INFO(dir_i->i_sb);
467 /* Try to reserve enough space for both node and dirent.
468 * Just the node will do for now, though
470 namelen = dentry->d_name.len;
471 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
472 JFFS2_SUMMARY_INODE_SIZE);
475 jffs2_free_raw_inode(ri);
479 inode = jffs2_new_inode(dir_i, mode, ri);
482 jffs2_free_raw_inode(ri);
483 jffs2_complete_reservation(c);
484 return PTR_ERR(inode);
487 inode->i_op = &jffs2_dir_inode_operations;
488 inode->i_fop = &jffs2_dir_operations;
490 f = JFFS2_INODE_INFO(inode);
492 /* Directories get nlink 2 at start */
494 /* but ic->pino_nlink is the parent ino# */
495 f->inocache->pino_nlink = dir_i->i_ino;
497 ri->data_crc = cpu_to_je32(0);
498 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
500 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
502 jffs2_free_raw_inode(ri);
505 /* Eeek. Wave bye bye */
506 mutex_unlock(&f->sem);
507 jffs2_complete_reservation(c);
511 /* No data here. Only a metadata node, which will be
512 obsoleted by the first data write
515 mutex_unlock(&f->sem);
517 jffs2_complete_reservation(c);
519 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
523 ret = jffs2_init_acl_post(inode);
527 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
528 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
532 rd = jffs2_alloc_raw_dirent();
534 /* Argh. Now we treat it like a normal delete */
535 jffs2_complete_reservation(c);
540 dir_f = JFFS2_INODE_INFO(dir_i);
541 mutex_lock(&dir_f->sem);
543 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
544 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
545 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
546 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
548 rd->pino = cpu_to_je32(dir_i->i_ino);
549 rd->version = cpu_to_je32(++dir_f->highest_version);
550 rd->ino = cpu_to_je32(inode->i_ino);
551 rd->mctime = cpu_to_je32(JFFS2_NOW());
554 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
555 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
557 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
560 /* dirent failed to write. Delete the inode normally
561 as if it were the final unlink() */
562 jffs2_complete_reservation(c);
563 jffs2_free_raw_dirent(rd);
564 mutex_unlock(&dir_f->sem);
569 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
572 jffs2_free_raw_dirent(rd);
574 /* Link the fd into the inode's list, obsoleting an old
576 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
578 mutex_unlock(&dir_f->sem);
579 jffs2_complete_reservation(c);
581 d_instantiate_new(dentry, inode);
589 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
591 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
592 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
593 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
594 struct jffs2_full_dirent *fd;
596 uint32_t now = JFFS2_NOW();
599 for (fd = f->dents ; fd; fd = fd->next) {
601 mutex_unlock(&f->sem);
605 mutex_unlock(&f->sem);
607 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
608 dentry->d_name.len, f, now);
610 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
611 clear_nlink(d_inode(dentry));
617 static int jffs2_mknod (struct user_namespace *mnt_userns, struct inode *dir_i,
618 struct dentry *dentry, umode_t mode, dev_t rdev)
620 struct jffs2_inode_info *f, *dir_f;
621 struct jffs2_sb_info *c;
623 struct jffs2_raw_inode *ri;
624 struct jffs2_raw_dirent *rd;
625 struct jffs2_full_dnode *fn;
626 struct jffs2_full_dirent *fd;
628 union jffs2_device_node dev;
633 ri = jffs2_alloc_raw_inode();
637 c = JFFS2_SB_INFO(dir_i->i_sb);
639 if (S_ISBLK(mode) || S_ISCHR(mode))
640 devlen = jffs2_encode_dev(&dev, rdev);
642 /* Try to reserve enough space for both node and dirent.
643 * Just the node will do for now, though
645 namelen = dentry->d_name.len;
646 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
647 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
650 jffs2_free_raw_inode(ri);
654 inode = jffs2_new_inode(dir_i, mode, ri);
657 jffs2_free_raw_inode(ri);
658 jffs2_complete_reservation(c);
659 return PTR_ERR(inode);
661 inode->i_op = &jffs2_file_inode_operations;
662 init_special_inode(inode, inode->i_mode, rdev);
664 f = JFFS2_INODE_INFO(inode);
666 ri->dsize = ri->csize = cpu_to_je32(devlen);
667 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
668 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
670 ri->compr = JFFS2_COMPR_NONE;
671 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
672 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
674 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
676 jffs2_free_raw_inode(ri);
679 /* Eeek. Wave bye bye */
680 mutex_unlock(&f->sem);
681 jffs2_complete_reservation(c);
685 /* No data here. Only a metadata node, which will be
686 obsoleted by the first data write
689 mutex_unlock(&f->sem);
691 jffs2_complete_reservation(c);
693 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
697 ret = jffs2_init_acl_post(inode);
701 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
702 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
706 rd = jffs2_alloc_raw_dirent();
708 /* Argh. Now we treat it like a normal delete */
709 jffs2_complete_reservation(c);
714 dir_f = JFFS2_INODE_INFO(dir_i);
715 mutex_lock(&dir_f->sem);
717 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
718 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
719 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
720 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
722 rd->pino = cpu_to_je32(dir_i->i_ino);
723 rd->version = cpu_to_je32(++dir_f->highest_version);
724 rd->ino = cpu_to_je32(inode->i_ino);
725 rd->mctime = cpu_to_je32(JFFS2_NOW());
728 /* XXX: This is ugly. */
729 rd->type = (mode & S_IFMT) >> 12;
731 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
732 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
734 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
737 /* dirent failed to write. Delete the inode normally
738 as if it were the final unlink() */
739 jffs2_complete_reservation(c);
740 jffs2_free_raw_dirent(rd);
741 mutex_unlock(&dir_f->sem);
746 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
748 jffs2_free_raw_dirent(rd);
750 /* Link the fd into the inode's list, obsoleting an old
752 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
754 mutex_unlock(&dir_f->sem);
755 jffs2_complete_reservation(c);
757 d_instantiate_new(dentry, inode);
765 static int jffs2_rename (struct user_namespace *mnt_userns,
766 struct inode *old_dir_i, struct dentry *old_dentry,
767 struct inode *new_dir_i, struct dentry *new_dentry,
771 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
772 struct jffs2_inode_info *victim_f = NULL;
776 if (flags & ~RENAME_NOREPLACE)
779 /* The VFS will check for us and prevent trying to rename a
780 * file over a directory and vice versa, but if it's a directory,
781 * the VFS can't check whether the victim is empty. The filesystem
782 * needs to do that for itself.
784 if (d_really_is_positive(new_dentry)) {
785 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
786 if (d_is_dir(new_dentry)) {
787 struct jffs2_full_dirent *fd;
789 mutex_lock(&victim_f->sem);
790 for (fd = victim_f->dents; fd; fd = fd->next) {
792 mutex_unlock(&victim_f->sem);
796 mutex_unlock(&victim_f->sem);
800 /* XXX: We probably ought to alloc enough space for
801 both nodes at the same time. Writing the new link,
802 then getting -ENOSPC, is quite bad :)
805 /* Make a hard link */
807 /* XXX: This is ugly */
808 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
809 if (!type) type = DT_REG;
812 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
813 d_inode(old_dentry)->i_ino, type,
814 new_dentry->d_name.name, new_dentry->d_name.len, now);
820 /* There was a victim. Kill it off nicely */
821 if (d_is_dir(new_dentry))
822 clear_nlink(d_inode(new_dentry));
824 drop_nlink(d_inode(new_dentry));
825 /* Don't oops if the victim was a dirent pointing to an
826 inode which didn't exist. */
827 if (victim_f->inocache) {
828 mutex_lock(&victim_f->sem);
829 if (d_is_dir(new_dentry))
830 victim_f->inocache->pino_nlink = 0;
832 victim_f->inocache->pino_nlink--;
833 mutex_unlock(&victim_f->sem);
837 /* If it was a directory we moved, and there was no victim,
838 increase i_nlink on its new parent */
839 if (d_is_dir(old_dentry) && !victim_f)
840 inc_nlink(new_dir_i);
842 /* Unlink the original */
843 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
844 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
846 /* We don't touch inode->i_nlink */
849 /* Oh shit. We really ought to make a single node which can do both atomically */
850 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
852 inc_nlink(d_inode(old_dentry));
853 if (f->inocache && !d_is_dir(old_dentry))
854 f->inocache->pino_nlink++;
855 mutex_unlock(&f->sem);
857 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
860 * We can't keep the target in dcache after that.
861 * For one thing, we can't afford dentry aliases for directories.
862 * For another, if there was a victim, we _can't_ set new inode
863 * for that sucker and we have to trigger mount eviction - the
864 * caller won't do it on its own since we are returning an error.
866 d_invalidate(new_dentry);
867 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
871 if (d_is_dir(old_dentry))
872 drop_nlink(old_dir_i);
874 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);