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 inode
*,struct dentry
*,umode_t
,
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
*,umode_t
);
35 static int jffs2_rmdir (struct inode
*,struct dentry
*);
36 static int jffs2_mknod (struct inode
*,struct dentry
*,umode_t
,dev_t
);
37 static int jffs2_rename (struct inode
*, struct dentry
*,
38 struct inode
*, struct dentry
*);
40 const struct file_operations jffs2_dir_operations
=
42 .read
= generic_read_dir
,
43 .iterate
= jffs2_readdir
,
44 .unlocked_ioctl
=jffs2_ioctl
,
46 .llseek
= generic_file_llseek
,
50 const struct inode_operations jffs2_dir_inode_operations
=
52 .create
= jffs2_create
,
53 .lookup
= jffs2_lookup
,
55 .unlink
= jffs2_unlink
,
56 .symlink
= jffs2_symlink
,
60 .rename
= jffs2_rename
,
61 .get_acl
= jffs2_get_acl
,
62 .set_acl
= jffs2_set_acl
,
63 .setattr
= jffs2_setattr
,
64 .setxattr
= jffs2_setxattr
,
65 .getxattr
= jffs2_getxattr
,
66 .listxattr
= jffs2_listxattr
,
67 .removexattr
= jffs2_removexattr
70 /***********************************************************************/
73 /* We keep the dirent list sorted in increasing order of name hash,
74 and we use the same hash function as the dentries. Makes this
77 static struct dentry
*jffs2_lookup(struct inode
*dir_i
, struct dentry
*target
,
80 struct jffs2_inode_info
*dir_f
;
81 struct jffs2_full_dirent
*fd
= NULL
, *fd_list
;
83 struct inode
*inode
= NULL
;
85 jffs2_dbg(1, "jffs2_lookup()\n");
87 if (target
->d_name
.len
> JFFS2_MAX_NAME_LEN
)
88 return ERR_PTR(-ENAMETOOLONG
);
90 dir_f
= JFFS2_INODE_INFO(dir_i
);
92 mutex_lock(&dir_f
->sem
);
94 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
95 for (fd_list
= dir_f
->dents
; fd_list
&& fd_list
->nhash
<= target
->d_name
.hash
; fd_list
= fd_list
->next
) {
96 if (fd_list
->nhash
== target
->d_name
.hash
&&
97 (!fd
|| fd_list
->version
> fd
->version
) &&
98 strlen(fd_list
->name
) == target
->d_name
.len
&&
99 !strncmp(fd_list
->name
, target
->d_name
.name
, target
->d_name
.len
)) {
105 mutex_unlock(&dir_f
->sem
);
107 inode
= jffs2_iget(dir_i
->i_sb
, ino
);
109 pr_warn("iget() failed for ino #%u\n", ino
);
112 return d_splice_alias(inode
, target
);
115 /***********************************************************************/
118 static int jffs2_readdir(struct file
*file
, struct dir_context
*ctx
)
120 struct inode
*inode
= file_inode(file
);
121 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(inode
);
122 struct jffs2_full_dirent
*fd
;
123 unsigned long curofs
= 1;
125 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode
->i_ino
);
127 if (!dir_emit_dots(file
, ctx
))
131 for (fd
= f
->dents
; fd
; fd
= fd
->next
) {
133 /* First loop: curofs = 2; pos = 2 */
134 if (curofs
< ctx
->pos
) {
135 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
136 fd
->name
, fd
->ino
, fd
->type
, curofs
, (unsigned long)ctx
->pos
);
140 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
145 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
146 (unsigned long)ctx
->pos
, fd
->name
, fd
->ino
, fd
->type
);
147 if (!dir_emit(ctx
, fd
->name
, strlen(fd
->name
), fd
->ino
, fd
->type
))
151 mutex_unlock(&f
->sem
);
155 /***********************************************************************/
158 static int jffs2_create(struct inode
*dir_i
, struct dentry
*dentry
,
159 umode_t mode
, bool excl
)
161 struct jffs2_raw_inode
*ri
;
162 struct jffs2_inode_info
*f
, *dir_f
;
163 struct jffs2_sb_info
*c
;
167 ri
= jffs2_alloc_raw_inode();
171 c
= JFFS2_SB_INFO(dir_i
->i_sb
);
173 jffs2_dbg(1, "%s()\n", __func__
);
175 inode
= jffs2_new_inode(dir_i
, mode
, ri
);
178 jffs2_dbg(1, "jffs2_new_inode() failed\n");
179 jffs2_free_raw_inode(ri
);
180 return PTR_ERR(inode
);
183 inode
->i_op
= &jffs2_file_inode_operations
;
184 inode
->i_fop
= &jffs2_file_operations
;
185 inode
->i_mapping
->a_ops
= &jffs2_file_address_operations
;
186 inode
->i_mapping
->nrpages
= 0;
188 f
= JFFS2_INODE_INFO(inode
);
189 dir_f
= JFFS2_INODE_INFO(dir_i
);
191 /* jffs2_do_create() will want to lock it, _after_ reserving
192 space and taking c-alloc_sem. If we keep it locked here,
193 lockdep gets unhappy (although it's a false positive;
194 nothing else will be looking at this inode yet so there's
195 no chance of AB-BA deadlock involving its f->sem). */
196 mutex_unlock(&f
->sem
);
198 ret
= jffs2_do_create(c
, dir_f
, f
, ri
, &dentry
->d_name
);
202 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(je32_to_cpu(ri
->ctime
));
204 jffs2_free_raw_inode(ri
);
206 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
207 __func__
, inode
->i_ino
, inode
->i_mode
, inode
->i_nlink
,
208 f
->inocache
->pino_nlink
, inode
->i_mapping
->nrpages
);
210 d_instantiate_new(dentry
, inode
);
215 jffs2_free_raw_inode(ri
);
219 /***********************************************************************/
222 static int jffs2_unlink(struct inode
*dir_i
, struct dentry
*dentry
)
224 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(dir_i
->i_sb
);
225 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
226 struct jffs2_inode_info
*dead_f
= JFFS2_INODE_INFO(d_inode(dentry
));
228 uint32_t now
= get_seconds();
230 ret
= jffs2_do_unlink(c
, dir_f
, dentry
->d_name
.name
,
231 dentry
->d_name
.len
, dead_f
, now
);
232 if (dead_f
->inocache
)
233 set_nlink(d_inode(dentry
), dead_f
->inocache
->pino_nlink
);
235 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
238 /***********************************************************************/
241 static int jffs2_link (struct dentry
*old_dentry
, struct inode
*dir_i
, struct dentry
*dentry
)
243 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(d_inode(old_dentry
)->i_sb
);
244 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(old_dentry
));
245 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
250 /* Don't let people make hard links to bad inodes. */
254 if (d_is_dir(old_dentry
))
257 /* XXX: This is ugly */
258 type
= (d_inode(old_dentry
)->i_mode
& S_IFMT
) >> 12;
259 if (!type
) type
= DT_REG
;
262 ret
= jffs2_do_link(c
, dir_f
, f
->inocache
->ino
, type
, dentry
->d_name
.name
, dentry
->d_name
.len
, now
);
266 set_nlink(d_inode(old_dentry
), ++f
->inocache
->pino_nlink
);
267 mutex_unlock(&f
->sem
);
268 d_instantiate(dentry
, d_inode(old_dentry
));
269 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
270 ihold(d_inode(old_dentry
));
275 /***********************************************************************/
277 static int jffs2_symlink (struct inode
*dir_i
, struct dentry
*dentry
, const char *target
)
279 struct jffs2_inode_info
*f
, *dir_f
;
280 struct jffs2_sb_info
*c
;
282 struct jffs2_raw_inode
*ri
;
283 struct jffs2_raw_dirent
*rd
;
284 struct jffs2_full_dnode
*fn
;
285 struct jffs2_full_dirent
*fd
;
288 int ret
, targetlen
= strlen(target
);
290 /* FIXME: If you care. We'd need to use frags for the target
291 if it grows much more than this */
293 return -ENAMETOOLONG
;
295 ri
= jffs2_alloc_raw_inode();
300 c
= JFFS2_SB_INFO(dir_i
->i_sb
);
302 /* Try to reserve enough space for both node and dirent.
303 * Just the node will do for now, though
305 namelen
= dentry
->d_name
.len
;
306 ret
= jffs2_reserve_space(c
, sizeof(*ri
) + targetlen
, &alloclen
,
307 ALLOC_NORMAL
, JFFS2_SUMMARY_INODE_SIZE
);
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
, ALLOC_NORMAL
);
337 jffs2_free_raw_inode(ri
);
340 /* Eeek. Wave bye bye */
341 mutex_unlock(&f
->sem
);
342 jffs2_complete_reservation(c
);
347 /* We use f->target field to store the target path. */
348 f
->target
= kmemdup(target
, targetlen
+ 1, GFP_KERNEL
);
350 pr_warn("Can't allocate %d bytes of memory\n", targetlen
+ 1);
351 mutex_unlock(&f
->sem
);
352 jffs2_complete_reservation(c
);
356 inode
->i_link
= f
->target
;
358 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
359 __func__
, (char *)f
->target
);
361 /* No data here. Only a metadata node, which will be
362 obsoleted by the first data write
365 mutex_unlock(&f
->sem
);
367 jffs2_complete_reservation(c
);
369 ret
= jffs2_init_security(inode
, dir_i
, &dentry
->d_name
);
373 ret
= jffs2_init_acl_post(inode
);
377 ret
= jffs2_reserve_space(c
, sizeof(*rd
)+namelen
, &alloclen
,
378 ALLOC_NORMAL
, JFFS2_SUMMARY_DIRENT_SIZE(namelen
));
382 rd
= jffs2_alloc_raw_dirent();
384 /* Argh. Now we treat it like a normal delete */
385 jffs2_complete_reservation(c
);
390 dir_f
= JFFS2_INODE_INFO(dir_i
);
391 mutex_lock(&dir_f
->sem
);
393 rd
->magic
= cpu_to_je16(JFFS2_MAGIC_BITMASK
);
394 rd
->nodetype
= cpu_to_je16(JFFS2_NODETYPE_DIRENT
);
395 rd
->totlen
= cpu_to_je32(sizeof(*rd
) + namelen
);
396 rd
->hdr_crc
= cpu_to_je32(crc32(0, rd
, sizeof(struct jffs2_unknown_node
)-4));
398 rd
->pino
= cpu_to_je32(dir_i
->i_ino
);
399 rd
->version
= cpu_to_je32(++dir_f
->highest_version
);
400 rd
->ino
= cpu_to_je32(inode
->i_ino
);
401 rd
->mctime
= cpu_to_je32(get_seconds());
404 rd
->node_crc
= cpu_to_je32(crc32(0, rd
, sizeof(*rd
)-8));
405 rd
->name_crc
= cpu_to_je32(crc32(0, dentry
->d_name
.name
, namelen
));
407 fd
= jffs2_write_dirent(c
, dir_f
, rd
, dentry
->d_name
.name
, namelen
, ALLOC_NORMAL
);
410 /* dirent failed to write. Delete the inode normally
411 as if it were the final unlink() */
412 jffs2_complete_reservation(c
);
413 jffs2_free_raw_dirent(rd
);
414 mutex_unlock(&dir_f
->sem
);
419 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(je32_to_cpu(rd
->mctime
));
421 jffs2_free_raw_dirent(rd
);
423 /* Link the fd into the inode's list, obsoleting an old
425 jffs2_add_fd_to_list(c
, fd
, &dir_f
->dents
);
427 mutex_unlock(&dir_f
->sem
);
428 jffs2_complete_reservation(c
);
430 d_instantiate_new(dentry
, inode
);
439 static int jffs2_mkdir (struct inode
*dir_i
, struct dentry
*dentry
, umode_t mode
)
441 struct jffs2_inode_info
*f
, *dir_f
;
442 struct jffs2_sb_info
*c
;
444 struct jffs2_raw_inode
*ri
;
445 struct jffs2_raw_dirent
*rd
;
446 struct jffs2_full_dnode
*fn
;
447 struct jffs2_full_dirent
*fd
;
454 ri
= jffs2_alloc_raw_inode();
458 c
= JFFS2_SB_INFO(dir_i
->i_sb
);
460 /* Try to reserve enough space for both node and dirent.
461 * Just the node will do for now, though
463 namelen
= dentry
->d_name
.len
;
464 ret
= jffs2_reserve_space(c
, sizeof(*ri
), &alloclen
, ALLOC_NORMAL
,
465 JFFS2_SUMMARY_INODE_SIZE
);
468 jffs2_free_raw_inode(ri
);
472 inode
= jffs2_new_inode(dir_i
, mode
, ri
);
475 jffs2_free_raw_inode(ri
);
476 jffs2_complete_reservation(c
);
477 return PTR_ERR(inode
);
480 inode
->i_op
= &jffs2_dir_inode_operations
;
481 inode
->i_fop
= &jffs2_dir_operations
;
483 f
= JFFS2_INODE_INFO(inode
);
485 /* Directories get nlink 2 at start */
487 /* but ic->pino_nlink is the parent ino# */
488 f
->inocache
->pino_nlink
= dir_i
->i_ino
;
490 ri
->data_crc
= cpu_to_je32(0);
491 ri
->node_crc
= cpu_to_je32(crc32(0, ri
, sizeof(*ri
)-8));
493 fn
= jffs2_write_dnode(c
, f
, ri
, NULL
, 0, ALLOC_NORMAL
);
495 jffs2_free_raw_inode(ri
);
498 /* Eeek. Wave bye bye */
499 mutex_unlock(&f
->sem
);
500 jffs2_complete_reservation(c
);
504 /* No data here. Only a metadata node, which will be
505 obsoleted by the first data write
508 mutex_unlock(&f
->sem
);
510 jffs2_complete_reservation(c
);
512 ret
= jffs2_init_security(inode
, dir_i
, &dentry
->d_name
);
516 ret
= jffs2_init_acl_post(inode
);
520 ret
= jffs2_reserve_space(c
, sizeof(*rd
)+namelen
, &alloclen
,
521 ALLOC_NORMAL
, JFFS2_SUMMARY_DIRENT_SIZE(namelen
));
525 rd
= jffs2_alloc_raw_dirent();
527 /* Argh. Now we treat it like a normal delete */
528 jffs2_complete_reservation(c
);
533 dir_f
= JFFS2_INODE_INFO(dir_i
);
534 mutex_lock(&dir_f
->sem
);
536 rd
->magic
= cpu_to_je16(JFFS2_MAGIC_BITMASK
);
537 rd
->nodetype
= cpu_to_je16(JFFS2_NODETYPE_DIRENT
);
538 rd
->totlen
= cpu_to_je32(sizeof(*rd
) + namelen
);
539 rd
->hdr_crc
= cpu_to_je32(crc32(0, rd
, sizeof(struct jffs2_unknown_node
)-4));
541 rd
->pino
= cpu_to_je32(dir_i
->i_ino
);
542 rd
->version
= cpu_to_je32(++dir_f
->highest_version
);
543 rd
->ino
= cpu_to_je32(inode
->i_ino
);
544 rd
->mctime
= cpu_to_je32(get_seconds());
547 rd
->node_crc
= cpu_to_je32(crc32(0, rd
, sizeof(*rd
)-8));
548 rd
->name_crc
= cpu_to_je32(crc32(0, dentry
->d_name
.name
, namelen
));
550 fd
= jffs2_write_dirent(c
, dir_f
, rd
, dentry
->d_name
.name
, namelen
, ALLOC_NORMAL
);
553 /* dirent failed to write. Delete the inode normally
554 as if it were the final unlink() */
555 jffs2_complete_reservation(c
);
556 jffs2_free_raw_dirent(rd
);
557 mutex_unlock(&dir_f
->sem
);
562 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(je32_to_cpu(rd
->mctime
));
565 jffs2_free_raw_dirent(rd
);
567 /* Link the fd into the inode's list, obsoleting an old
569 jffs2_add_fd_to_list(c
, fd
, &dir_f
->dents
);
571 mutex_unlock(&dir_f
->sem
);
572 jffs2_complete_reservation(c
);
574 d_instantiate_new(dentry
, inode
);
582 static int jffs2_rmdir (struct inode
*dir_i
, struct dentry
*dentry
)
584 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(dir_i
->i_sb
);
585 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
586 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(dentry
));
587 struct jffs2_full_dirent
*fd
;
589 uint32_t now
= get_seconds();
591 for (fd
= f
->dents
; fd
; fd
= fd
->next
) {
596 ret
= jffs2_do_unlink(c
, dir_f
, dentry
->d_name
.name
,
597 dentry
->d_name
.len
, f
, now
);
599 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
600 clear_nlink(d_inode(dentry
));
606 static int jffs2_mknod (struct inode
*dir_i
, struct dentry
*dentry
, umode_t mode
, dev_t rdev
)
608 struct jffs2_inode_info
*f
, *dir_f
;
609 struct jffs2_sb_info
*c
;
611 struct jffs2_raw_inode
*ri
;
612 struct jffs2_raw_dirent
*rd
;
613 struct jffs2_full_dnode
*fn
;
614 struct jffs2_full_dirent
*fd
;
616 union jffs2_device_node dev
;
621 ri
= jffs2_alloc_raw_inode();
625 c
= JFFS2_SB_INFO(dir_i
->i_sb
);
627 if (S_ISBLK(mode
) || S_ISCHR(mode
))
628 devlen
= jffs2_encode_dev(&dev
, rdev
);
630 /* Try to reserve enough space for both node and dirent.
631 * Just the node will do for now, though
633 namelen
= dentry
->d_name
.len
;
634 ret
= jffs2_reserve_space(c
, sizeof(*ri
) + devlen
, &alloclen
,
635 ALLOC_NORMAL
, JFFS2_SUMMARY_INODE_SIZE
);
638 jffs2_free_raw_inode(ri
);
642 inode
= jffs2_new_inode(dir_i
, mode
, ri
);
645 jffs2_free_raw_inode(ri
);
646 jffs2_complete_reservation(c
);
647 return PTR_ERR(inode
);
649 inode
->i_op
= &jffs2_file_inode_operations
;
650 init_special_inode(inode
, inode
->i_mode
, rdev
);
652 f
= JFFS2_INODE_INFO(inode
);
654 ri
->dsize
= ri
->csize
= cpu_to_je32(devlen
);
655 ri
->totlen
= cpu_to_je32(sizeof(*ri
) + devlen
);
656 ri
->hdr_crc
= cpu_to_je32(crc32(0, ri
, sizeof(struct jffs2_unknown_node
)-4));
658 ri
->compr
= JFFS2_COMPR_NONE
;
659 ri
->data_crc
= cpu_to_je32(crc32(0, &dev
, devlen
));
660 ri
->node_crc
= cpu_to_je32(crc32(0, ri
, sizeof(*ri
)-8));
662 fn
= jffs2_write_dnode(c
, f
, ri
, (char *)&dev
, devlen
, ALLOC_NORMAL
);
664 jffs2_free_raw_inode(ri
);
667 /* Eeek. Wave bye bye */
668 mutex_unlock(&f
->sem
);
669 jffs2_complete_reservation(c
);
673 /* No data here. Only a metadata node, which will be
674 obsoleted by the first data write
677 mutex_unlock(&f
->sem
);
679 jffs2_complete_reservation(c
);
681 ret
= jffs2_init_security(inode
, dir_i
, &dentry
->d_name
);
685 ret
= jffs2_init_acl_post(inode
);
689 ret
= jffs2_reserve_space(c
, sizeof(*rd
)+namelen
, &alloclen
,
690 ALLOC_NORMAL
, JFFS2_SUMMARY_DIRENT_SIZE(namelen
));
694 rd
= jffs2_alloc_raw_dirent();
696 /* Argh. Now we treat it like a normal delete */
697 jffs2_complete_reservation(c
);
702 dir_f
= JFFS2_INODE_INFO(dir_i
);
703 mutex_lock(&dir_f
->sem
);
705 rd
->magic
= cpu_to_je16(JFFS2_MAGIC_BITMASK
);
706 rd
->nodetype
= cpu_to_je16(JFFS2_NODETYPE_DIRENT
);
707 rd
->totlen
= cpu_to_je32(sizeof(*rd
) + namelen
);
708 rd
->hdr_crc
= cpu_to_je32(crc32(0, rd
, sizeof(struct jffs2_unknown_node
)-4));
710 rd
->pino
= cpu_to_je32(dir_i
->i_ino
);
711 rd
->version
= cpu_to_je32(++dir_f
->highest_version
);
712 rd
->ino
= cpu_to_je32(inode
->i_ino
);
713 rd
->mctime
= cpu_to_je32(get_seconds());
716 /* XXX: This is ugly. */
717 rd
->type
= (mode
& S_IFMT
) >> 12;
719 rd
->node_crc
= cpu_to_je32(crc32(0, rd
, sizeof(*rd
)-8));
720 rd
->name_crc
= cpu_to_je32(crc32(0, dentry
->d_name
.name
, namelen
));
722 fd
= jffs2_write_dirent(c
, dir_f
, rd
, dentry
->d_name
.name
, namelen
, ALLOC_NORMAL
);
725 /* dirent failed to write. Delete the inode normally
726 as if it were the final unlink() */
727 jffs2_complete_reservation(c
);
728 jffs2_free_raw_dirent(rd
);
729 mutex_unlock(&dir_f
->sem
);
734 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(je32_to_cpu(rd
->mctime
));
736 jffs2_free_raw_dirent(rd
);
738 /* Link the fd into the inode's list, obsoleting an old
740 jffs2_add_fd_to_list(c
, fd
, &dir_f
->dents
);
742 mutex_unlock(&dir_f
->sem
);
743 jffs2_complete_reservation(c
);
745 d_instantiate_new(dentry
, inode
);
753 static int jffs2_rename (struct inode
*old_dir_i
, struct dentry
*old_dentry
,
754 struct inode
*new_dir_i
, struct dentry
*new_dentry
)
757 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(old_dir_i
->i_sb
);
758 struct jffs2_inode_info
*victim_f
= NULL
;
762 /* The VFS will check for us and prevent trying to rename a
763 * file over a directory and vice versa, but if it's a directory,
764 * the VFS can't check whether the victim is empty. The filesystem
765 * needs to do that for itself.
767 if (d_really_is_positive(new_dentry
)) {
768 victim_f
= JFFS2_INODE_INFO(d_inode(new_dentry
));
769 if (d_is_dir(new_dentry
)) {
770 struct jffs2_full_dirent
*fd
;
772 mutex_lock(&victim_f
->sem
);
773 for (fd
= victim_f
->dents
; fd
; fd
= fd
->next
) {
775 mutex_unlock(&victim_f
->sem
);
779 mutex_unlock(&victim_f
->sem
);
783 /* XXX: We probably ought to alloc enough space for
784 both nodes at the same time. Writing the new link,
785 then getting -ENOSPC, is quite bad :)
788 /* Make a hard link */
790 /* XXX: This is ugly */
791 type
= (d_inode(old_dentry
)->i_mode
& S_IFMT
) >> 12;
792 if (!type
) type
= DT_REG
;
795 ret
= jffs2_do_link(c
, JFFS2_INODE_INFO(new_dir_i
),
796 d_inode(old_dentry
)->i_ino
, type
,
797 new_dentry
->d_name
.name
, new_dentry
->d_name
.len
, now
);
803 /* There was a victim. Kill it off nicely */
804 if (d_is_dir(new_dentry
))
805 clear_nlink(d_inode(new_dentry
));
807 drop_nlink(d_inode(new_dentry
));
808 /* Don't oops if the victim was a dirent pointing to an
809 inode which didn't exist. */
810 if (victim_f
->inocache
) {
811 mutex_lock(&victim_f
->sem
);
812 if (d_is_dir(new_dentry
))
813 victim_f
->inocache
->pino_nlink
= 0;
815 victim_f
->inocache
->pino_nlink
--;
816 mutex_unlock(&victim_f
->sem
);
820 /* If it was a directory we moved, and there was no victim,
821 increase i_nlink on its new parent */
822 if (d_is_dir(old_dentry
) && !victim_f
)
823 inc_nlink(new_dir_i
);
825 /* Unlink the original */
826 ret
= jffs2_do_unlink(c
, JFFS2_INODE_INFO(old_dir_i
),
827 old_dentry
->d_name
.name
, old_dentry
->d_name
.len
, NULL
, now
);
829 /* We don't touch inode->i_nlink */
832 /* Oh shit. We really ought to make a single node which can do both atomically */
833 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(old_dentry
));
835 inc_nlink(d_inode(old_dentry
));
836 if (f
->inocache
&& !d_is_dir(old_dentry
))
837 f
->inocache
->pino_nlink
++;
838 mutex_unlock(&f
->sem
);
840 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
843 * We can't keep the target in dcache after that.
844 * For one thing, we can't afford dentry aliases for directories.
845 * For another, if there was a victim, we _can't_ set new inode
846 * for that sucker and we have to trigger mount eviction - the
847 * caller won't do it on its own since we are returning an error.
849 d_invalidate(new_dentry
);
850 new_dir_i
->i_mtime
= new_dir_i
->i_ctime
= ITIME(now
);
854 if (d_is_dir(old_dentry
))
855 drop_nlink(old_dir_i
);
857 new_dir_i
->i_mtime
= new_dir_i
->i_ctime
= old_dir_i
->i_mtime
= old_dir_i
->i_ctime
= ITIME(now
);