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
*,
41 const struct file_operations jffs2_dir_operations
=
43 .read
= generic_read_dir
,
44 .iterate_shared
=jffs2_readdir
,
45 .unlocked_ioctl
=jffs2_ioctl
,
47 .llseek
= generic_file_llseek
,
51 const struct inode_operations jffs2_dir_inode_operations
=
53 .create
= jffs2_create
,
54 .lookup
= jffs2_lookup
,
56 .unlink
= jffs2_unlink
,
57 .symlink
= jffs2_symlink
,
61 .rename
= jffs2_rename
,
62 .get_acl
= jffs2_get_acl
,
63 .set_acl
= jffs2_set_acl
,
64 .setattr
= jffs2_setattr
,
65 .setxattr
= jffs2_setxattr
,
66 .getxattr
= jffs2_getxattr
,
67 .listxattr
= jffs2_listxattr
,
68 .removexattr
= jffs2_removexattr
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 inode
*dir_i
, struct dentry
*dentry
,
164 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 unlock_new_inode(inode
);
216 d_instantiate(dentry
, inode
);
221 jffs2_free_raw_inode(ri
);
225 /***********************************************************************/
228 static int jffs2_unlink(struct inode
*dir_i
, struct dentry
*dentry
)
230 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(dir_i
->i_sb
);
231 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
232 struct jffs2_inode_info
*dead_f
= JFFS2_INODE_INFO(d_inode(dentry
));
234 uint32_t now
= get_seconds();
236 ret
= jffs2_do_unlink(c
, dir_f
, dentry
->d_name
.name
,
237 dentry
->d_name
.len
, dead_f
, now
);
238 if (dead_f
->inocache
)
239 set_nlink(d_inode(dentry
), dead_f
->inocache
->pino_nlink
);
241 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
244 /***********************************************************************/
247 static int jffs2_link (struct dentry
*old_dentry
, struct inode
*dir_i
, struct dentry
*dentry
)
249 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(old_dentry
->d_sb
);
250 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(old_dentry
));
251 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
256 /* Don't let people make hard links to bad inodes. */
260 if (d_is_dir(old_dentry
))
263 /* XXX: This is ugly */
264 type
= (d_inode(old_dentry
)->i_mode
& S_IFMT
) >> 12;
265 if (!type
) type
= DT_REG
;
268 ret
= jffs2_do_link(c
, dir_f
, f
->inocache
->ino
, type
, dentry
->d_name
.name
, dentry
->d_name
.len
, now
);
272 set_nlink(d_inode(old_dentry
), ++f
->inocache
->pino_nlink
);
273 mutex_unlock(&f
->sem
);
274 d_instantiate(dentry
, d_inode(old_dentry
));
275 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
276 ihold(d_inode(old_dentry
));
281 /***********************************************************************/
283 static int jffs2_symlink (struct inode
*dir_i
, 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(get_seconds());
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 unlock_new_inode(inode
);
437 d_instantiate(dentry
, inode
);
446 static int jffs2_mkdir (struct inode
*dir_i
, 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(get_seconds());
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 unlock_new_inode(inode
);
582 d_instantiate(dentry
, inode
);
590 static int jffs2_rmdir (struct inode
*dir_i
, struct dentry
*dentry
)
592 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(dir_i
->i_sb
);
593 struct jffs2_inode_info
*dir_f
= JFFS2_INODE_INFO(dir_i
);
594 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(dentry
));
595 struct jffs2_full_dirent
*fd
;
597 uint32_t now
= get_seconds();
599 for (fd
= f
->dents
; fd
; fd
= fd
->next
) {
604 ret
= jffs2_do_unlink(c
, dir_f
, dentry
->d_name
.name
,
605 dentry
->d_name
.len
, f
, now
);
607 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(now
);
608 clear_nlink(d_inode(dentry
));
614 static int jffs2_mknod (struct inode
*dir_i
, struct dentry
*dentry
, umode_t mode
, dev_t rdev
)
616 struct jffs2_inode_info
*f
, *dir_f
;
617 struct jffs2_sb_info
*c
;
619 struct jffs2_raw_inode
*ri
;
620 struct jffs2_raw_dirent
*rd
;
621 struct jffs2_full_dnode
*fn
;
622 struct jffs2_full_dirent
*fd
;
624 union jffs2_device_node dev
;
629 ri
= jffs2_alloc_raw_inode();
633 c
= JFFS2_SB_INFO(dir_i
->i_sb
);
635 if (S_ISBLK(mode
) || S_ISCHR(mode
))
636 devlen
= jffs2_encode_dev(&dev
, rdev
);
638 /* Try to reserve enough space for both node and dirent.
639 * Just the node will do for now, though
641 namelen
= dentry
->d_name
.len
;
642 ret
= jffs2_reserve_space(c
, sizeof(*ri
) + devlen
, &alloclen
,
643 ALLOC_NORMAL
, JFFS2_SUMMARY_INODE_SIZE
);
646 jffs2_free_raw_inode(ri
);
650 inode
= jffs2_new_inode(dir_i
, mode
, ri
);
653 jffs2_free_raw_inode(ri
);
654 jffs2_complete_reservation(c
);
655 return PTR_ERR(inode
);
657 inode
->i_op
= &jffs2_file_inode_operations
;
658 init_special_inode(inode
, inode
->i_mode
, rdev
);
660 f
= JFFS2_INODE_INFO(inode
);
662 ri
->dsize
= ri
->csize
= cpu_to_je32(devlen
);
663 ri
->totlen
= cpu_to_je32(sizeof(*ri
) + devlen
);
664 ri
->hdr_crc
= cpu_to_je32(crc32(0, ri
, sizeof(struct jffs2_unknown_node
)-4));
666 ri
->compr
= JFFS2_COMPR_NONE
;
667 ri
->data_crc
= cpu_to_je32(crc32(0, &dev
, devlen
));
668 ri
->node_crc
= cpu_to_je32(crc32(0, ri
, sizeof(*ri
)-8));
670 fn
= jffs2_write_dnode(c
, f
, ri
, (char *)&dev
, devlen
, ALLOC_NORMAL
);
672 jffs2_free_raw_inode(ri
);
675 /* Eeek. Wave bye bye */
676 mutex_unlock(&f
->sem
);
677 jffs2_complete_reservation(c
);
681 /* No data here. Only a metadata node, which will be
682 obsoleted by the first data write
685 mutex_unlock(&f
->sem
);
687 jffs2_complete_reservation(c
);
689 ret
= jffs2_init_security(inode
, dir_i
, &dentry
->d_name
);
693 ret
= jffs2_init_acl_post(inode
);
697 ret
= jffs2_reserve_space(c
, sizeof(*rd
)+namelen
, &alloclen
,
698 ALLOC_NORMAL
, JFFS2_SUMMARY_DIRENT_SIZE(namelen
));
702 rd
= jffs2_alloc_raw_dirent();
704 /* Argh. Now we treat it like a normal delete */
705 jffs2_complete_reservation(c
);
710 dir_f
= JFFS2_INODE_INFO(dir_i
);
711 mutex_lock(&dir_f
->sem
);
713 rd
->magic
= cpu_to_je16(JFFS2_MAGIC_BITMASK
);
714 rd
->nodetype
= cpu_to_je16(JFFS2_NODETYPE_DIRENT
);
715 rd
->totlen
= cpu_to_je32(sizeof(*rd
) + namelen
);
716 rd
->hdr_crc
= cpu_to_je32(crc32(0, rd
, sizeof(struct jffs2_unknown_node
)-4));
718 rd
->pino
= cpu_to_je32(dir_i
->i_ino
);
719 rd
->version
= cpu_to_je32(++dir_f
->highest_version
);
720 rd
->ino
= cpu_to_je32(inode
->i_ino
);
721 rd
->mctime
= cpu_to_je32(get_seconds());
724 /* XXX: This is ugly. */
725 rd
->type
= (mode
& S_IFMT
) >> 12;
727 rd
->node_crc
= cpu_to_je32(crc32(0, rd
, sizeof(*rd
)-8));
728 rd
->name_crc
= cpu_to_je32(crc32(0, dentry
->d_name
.name
, namelen
));
730 fd
= jffs2_write_dirent(c
, dir_f
, rd
, dentry
->d_name
.name
, namelen
, ALLOC_NORMAL
);
733 /* dirent failed to write. Delete the inode normally
734 as if it were the final unlink() */
735 jffs2_complete_reservation(c
);
736 jffs2_free_raw_dirent(rd
);
737 mutex_unlock(&dir_f
->sem
);
742 dir_i
->i_mtime
= dir_i
->i_ctime
= ITIME(je32_to_cpu(rd
->mctime
));
744 jffs2_free_raw_dirent(rd
);
746 /* Link the fd into the inode's list, obsoleting an old
748 jffs2_add_fd_to_list(c
, fd
, &dir_f
->dents
);
750 mutex_unlock(&dir_f
->sem
);
751 jffs2_complete_reservation(c
);
753 unlock_new_inode(inode
);
754 d_instantiate(dentry
, inode
);
762 static int jffs2_rename (struct inode
*old_dir_i
, struct dentry
*old_dentry
,
763 struct inode
*new_dir_i
, struct dentry
*new_dentry
,
767 struct jffs2_sb_info
*c
= JFFS2_SB_INFO(old_dir_i
->i_sb
);
768 struct jffs2_inode_info
*victim_f
= NULL
;
772 if (flags
& ~RENAME_NOREPLACE
)
775 /* The VFS will check for us and prevent trying to rename a
776 * file over a directory and vice versa, but if it's a directory,
777 * the VFS can't check whether the victim is empty. The filesystem
778 * needs to do that for itself.
780 if (d_really_is_positive(new_dentry
)) {
781 victim_f
= JFFS2_INODE_INFO(d_inode(new_dentry
));
782 if (d_is_dir(new_dentry
)) {
783 struct jffs2_full_dirent
*fd
;
785 mutex_lock(&victim_f
->sem
);
786 for (fd
= victim_f
->dents
; fd
; fd
= fd
->next
) {
788 mutex_unlock(&victim_f
->sem
);
792 mutex_unlock(&victim_f
->sem
);
796 /* XXX: We probably ought to alloc enough space for
797 both nodes at the same time. Writing the new link,
798 then getting -ENOSPC, is quite bad :)
801 /* Make a hard link */
803 /* XXX: This is ugly */
804 type
= (d_inode(old_dentry
)->i_mode
& S_IFMT
) >> 12;
805 if (!type
) type
= DT_REG
;
808 ret
= jffs2_do_link(c
, JFFS2_INODE_INFO(new_dir_i
),
809 d_inode(old_dentry
)->i_ino
, type
,
810 new_dentry
->d_name
.name
, new_dentry
->d_name
.len
, now
);
816 /* There was a victim. Kill it off nicely */
817 if (d_is_dir(new_dentry
))
818 clear_nlink(d_inode(new_dentry
));
820 drop_nlink(d_inode(new_dentry
));
821 /* Don't oops if the victim was a dirent pointing to an
822 inode which didn't exist. */
823 if (victim_f
->inocache
) {
824 mutex_lock(&victim_f
->sem
);
825 if (d_is_dir(new_dentry
))
826 victim_f
->inocache
->pino_nlink
= 0;
828 victim_f
->inocache
->pino_nlink
--;
829 mutex_unlock(&victim_f
->sem
);
833 /* If it was a directory we moved, and there was no victim,
834 increase i_nlink on its new parent */
835 if (d_is_dir(old_dentry
) && !victim_f
)
836 inc_nlink(new_dir_i
);
838 /* Unlink the original */
839 ret
= jffs2_do_unlink(c
, JFFS2_INODE_INFO(old_dir_i
),
840 old_dentry
->d_name
.name
, old_dentry
->d_name
.len
, NULL
, now
);
842 /* We don't touch inode->i_nlink */
845 /* Oh shit. We really ought to make a single node which can do both atomically */
846 struct jffs2_inode_info
*f
= JFFS2_INODE_INFO(d_inode(old_dentry
));
848 inc_nlink(d_inode(old_dentry
));
849 if (f
->inocache
&& !d_is_dir(old_dentry
))
850 f
->inocache
->pino_nlink
++;
851 mutex_unlock(&f
->sem
);
853 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
856 * We can't keep the target in dcache after that.
857 * For one thing, we can't afford dentry aliases for directories.
858 * For another, if there was a victim, we _can't_ set new inode
859 * for that sucker and we have to trigger mount eviction - the
860 * caller won't do it on its own since we are returning an error.
862 d_invalidate(new_dentry
);
863 new_dir_i
->i_mtime
= new_dir_i
->i_ctime
= ITIME(now
);
867 if (d_is_dir(old_dentry
))
868 drop_nlink(old_dir_i
);
870 new_dir_i
->i_mtime
= new_dir_i
->i_ctime
= old_dir_i
->i_mtime
= old_dir_i
->i_ctime
= ITIME(now
);