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semaphore: __down_common: use signal_pending_state()
[linux-2.6/mini2440.git] / fs / jffs2 / dir.c
blobcd219ef552543cdc98d0a392f95cd6dc1c3ec4fd
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/fs.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>
20 #include "nodelist.h"
21
22 static int jffs2_readdir (struct file *, void *, filldir_t);
23
24 static int jffs2_create (struct inode *,struct dentry *,int,
25 struct nameidata *);
26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
27 struct nameidata *);
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 *);
36
37 const struct file_operations jffs2_dir_operations =
38 {
39 .read = generic_read_dir,
40 .readdir = jffs2_readdir,
41 .unlocked_ioctl=jffs2_ioctl,
42 .fsync = jffs2_fsync
43 };
44
45
46 const struct inode_operations jffs2_dir_inode_operations =
47 {
48 .create = jffs2_create,
49 .lookup = jffs2_lookup,
50 .link = jffs2_link,
51 .unlink = jffs2_unlink,
52 .symlink = jffs2_symlink,
53 .mkdir = jffs2_mkdir,
54 .rmdir = jffs2_rmdir,
55 .mknod = jffs2_mknod,
56 .rename = jffs2_rename,
57 .permission = jffs2_permission,
58 .setattr = jffs2_setattr,
59 .setxattr = jffs2_setxattr,
60 .getxattr = jffs2_getxattr,
61 .listxattr = jffs2_listxattr,
62 .removexattr = jffs2_removexattr
63 };
64
65 /***********************************************************************/
66
67
68 /* We keep the dirent list sorted in increasing order of name hash,
69 and we use the same hash function as the dentries. Makes this
70 nice and simple
71 */
72 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
73 struct nameidata *nd)
74 {
75 struct jffs2_inode_info *dir_f;
76 struct jffs2_sb_info *c;
77 struct jffs2_full_dirent *fd = NULL, *fd_list;
78 uint32_t ino = 0;
79 struct inode *inode = NULL;
80
81 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
82
83 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
84 return ERR_PTR(-ENAMETOOLONG);
85
86 dir_f = JFFS2_INODE_INFO(dir_i);
87 c = JFFS2_SB_INFO(dir_i->i_sb);
88
89 mutex_lock(&dir_f->sem);
90
91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
93 if (fd_list->nhash == target->d_name.hash &&
94 (!fd || fd_list->version > fd->version) &&
95 strlen(fd_list->name) == target->d_name.len &&
96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
97 fd = fd_list;
98 }
99 }
100 if (fd)
101 ino = fd->ino;
102 mutex_unlock(&dir_f->sem);
103 if (ino) {
104 inode = jffs2_iget(dir_i->i_sb, ino);
105 if (IS_ERR(inode)) {
106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107 return ERR_CAST(inode);
108 }
109 }
110
111 d_add(target, inode);
112
113 return NULL;
114 }
115
116 /***********************************************************************/
117
118
119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
120 {
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;
126
127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
128
129 f = JFFS2_INODE_INFO(inode);
130 c = JFFS2_SB_INFO(inode->i_sb);
131
132 offset = filp->f_pos;
133
134 if (offset == 0) {
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)
137 goto out;
138 offset++;
139 }
140 if (offset == 1) {
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)
144 goto out;
145 offset++;
146 }
147
148 curofs=1;
149 mutex_lock(&f->sem);
150 for (fd = f->dents; fd; fd = fd->next) {
151
152 curofs++;
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));
157 continue;
158 }
159 if (!fd->ino) {
160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
161 offset++;
162 continue;
163 }
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)
166 break;
167 offset++;
168 }
169 mutex_unlock(&f->sem);
170 out:
171 filp->f_pos = offset;
172 return 0;
173 }
174
175 /***********************************************************************/
176
177
178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
179 struct nameidata *nd)
180 {
181 struct jffs2_raw_inode *ri;
182 struct jffs2_inode_info *f, *dir_f;
183 struct jffs2_sb_info *c;
184 struct inode *inode;
185 int ret;
186
187 ri = jffs2_alloc_raw_inode();
188 if (!ri)
189 return -ENOMEM;
190
191 c = JFFS2_SB_INFO(dir_i->i_sb);
192
193 D1(printk(KERN_DEBUG "jffs2_create()\n"));
194
195 inode = jffs2_new_inode(dir_i, mode, ri);
196
197 if (IS_ERR(inode)) {
198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
199 jffs2_free_raw_inode(ri);
200 return PTR_ERR(inode);
201 }
202
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;
207
208 f = JFFS2_INODE_INFO(inode);
209 dir_f = JFFS2_INODE_INFO(dir_i);
210
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);
217
218 ret = jffs2_do_create(c, dir_f, f, ri,
219 dentry->d_name.name, dentry->d_name.len);
220 if (ret)
221 goto fail;
222
223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
224
225 jffs2_free_raw_inode(ri);
226 d_instantiate(dentry, inode);
227
228 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
229 inode->i_ino, inode->i_mode, inode->i_nlink,
230 f->inocache->pino_nlink, inode->i_mapping->nrpages));
231 return 0;
232
233 fail:
234 make_bad_inode(inode);
235 iput(inode);
236 jffs2_free_raw_inode(ri);
237 return ret;
238 }
239
240 /***********************************************************************/
241
242
243 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
244 {
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);
248 int ret;
249 uint32_t now = get_seconds();
250
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;
255 if (!ret)
256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
257 return ret;
258 }
259 /***********************************************************************/
260
261
262 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
263 {
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);
267 int ret;
268 uint8_t type;
269 uint32_t now;
270
271 /* Don't let people make hard links to bad inodes. */
272 if (!f->inocache)
273 return -EIO;
274
275 if (S_ISDIR(old_dentry->d_inode->i_mode))
276 return -EPERM;
277
278 /* XXX: This is ugly */
279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
280 if (!type) type = DT_REG;
281
282 now = get_seconds();
283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
284
285 if (!ret) {
286 mutex_lock(&f->sem);
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 atomic_inc(&old_dentry->d_inode->i_count);
292 }
293 return ret;
294 }
295
296 /***********************************************************************/
297
298 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
299 {
300 struct jffs2_inode_info *f, *dir_f;
301 struct jffs2_sb_info *c;
302 struct inode *inode;
303 struct jffs2_raw_inode *ri;
304 struct jffs2_raw_dirent *rd;
305 struct jffs2_full_dnode *fn;
306 struct jffs2_full_dirent *fd;
307 int namelen;
308 uint32_t alloclen;
309 int ret, targetlen = strlen(target);
310
311 /* FIXME: If you care. We'd need to use frags for the target
312 if it grows much more than this */
313 if (targetlen > 254)
314 return -EINVAL;
315
316 ri = jffs2_alloc_raw_inode();
317
318 if (!ri)
319 return -ENOMEM;
320
321 c = JFFS2_SB_INFO(dir_i->i_sb);
322
323 /* Try to reserve enough space for both node and dirent.
324 * Just the node will do for now, though
325 */
326 namelen = dentry->d_name.len;
327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
329
330 if (ret) {
331 jffs2_free_raw_inode(ri);
332 return ret;
333 }
334
335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
336
337 if (IS_ERR(inode)) {
338 jffs2_free_raw_inode(ri);
339 jffs2_complete_reservation(c);
340 return PTR_ERR(inode);
341 }
342
343 inode->i_op = &jffs2_symlink_inode_operations;
344
345 f = JFFS2_INODE_INFO(inode);
346
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));
351
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));
355
356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
357
358 jffs2_free_raw_inode(ri);
359
360 if (IS_ERR(fn)) {
361 /* Eeek. Wave bye bye */
362 mutex_unlock(&f->sem);
363 jffs2_complete_reservation(c);
364 jffs2_clear_inode(inode);
365 return PTR_ERR(fn);
366 }
367
368 /* We use f->target field to store the target path. */
369 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
370 if (!f->target) {
371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
372 mutex_unlock(&f->sem);
373 jffs2_complete_reservation(c);
374 jffs2_clear_inode(inode);
375 return -ENOMEM;
376 }
377
378 memcpy(f->target, target, targetlen + 1);
379 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
380
381 /* No data here. Only a metadata node, which will be
382 obsoleted by the first data write
383 */
384 f->metadata = fn;
385 mutex_unlock(&f->sem);
386
387 jffs2_complete_reservation(c);
388
389 ret = jffs2_init_security(inode, dir_i);
390 if (ret) {
391 jffs2_clear_inode(inode);
392 return ret;
393 }
394 ret = jffs2_init_acl_post(inode);
395 if (ret) {
396 jffs2_clear_inode(inode);
397 return ret;
398 }
399
400 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
401 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
402 if (ret) {
403 /* Eep. */
404 jffs2_clear_inode(inode);
405 return ret;
406 }
407
408 rd = jffs2_alloc_raw_dirent();
409 if (!rd) {
410 /* Argh. Now we treat it like a normal delete */
411 jffs2_complete_reservation(c);
412 jffs2_clear_inode(inode);
413 return -ENOMEM;
414 }
415
416 dir_f = JFFS2_INODE_INFO(dir_i);
417 mutex_lock(&dir_f->sem);
418
419 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
420 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
421 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
422 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
423
424 rd->pino = cpu_to_je32(dir_i->i_ino);
425 rd->version = cpu_to_je32(++dir_f->highest_version);
426 rd->ino = cpu_to_je32(inode->i_ino);
427 rd->mctime = cpu_to_je32(get_seconds());
428 rd->nsize = namelen;
429 rd->type = DT_LNK;
430 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
431 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
432
433 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
434
435 if (IS_ERR(fd)) {
436 /* dirent failed to write. Delete the inode normally
437 as if it were the final unlink() */
438 jffs2_complete_reservation(c);
439 jffs2_free_raw_dirent(rd);
440 mutex_unlock(&dir_f->sem);
441 jffs2_clear_inode(inode);
442 return PTR_ERR(fd);
443 }
444
445 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
446
447 jffs2_free_raw_dirent(rd);
448
449 /* Link the fd into the inode's list, obsoleting an old
450 one if necessary. */
451 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
452
453 mutex_unlock(&dir_f->sem);
454 jffs2_complete_reservation(c);
455
456 d_instantiate(dentry, inode);
457 return 0;
458 }
459
460
461 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
462 {
463 struct jffs2_inode_info *f, *dir_f;
464 struct jffs2_sb_info *c;
465 struct inode *inode;
466 struct jffs2_raw_inode *ri;
467 struct jffs2_raw_dirent *rd;
468 struct jffs2_full_dnode *fn;
469 struct jffs2_full_dirent *fd;
470 int namelen;
471 uint32_t alloclen;
472 int ret;
473
474 mode |= S_IFDIR;
475
476 ri = jffs2_alloc_raw_inode();
477 if (!ri)
478 return -ENOMEM;
479
480 c = JFFS2_SB_INFO(dir_i->i_sb);
481
482 /* Try to reserve enough space for both node and dirent.
483 * Just the node will do for now, though
484 */
485 namelen = dentry->d_name.len;
486 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
487 JFFS2_SUMMARY_INODE_SIZE);
488
489 if (ret) {
490 jffs2_free_raw_inode(ri);
491 return ret;
492 }
493
494 inode = jffs2_new_inode(dir_i, mode, ri);
495
496 if (IS_ERR(inode)) {
497 jffs2_free_raw_inode(ri);
498 jffs2_complete_reservation(c);
499 return PTR_ERR(inode);
500 }
501
502 inode->i_op = &jffs2_dir_inode_operations;
503 inode->i_fop = &jffs2_dir_operations;
504
505 f = JFFS2_INODE_INFO(inode);
506
507 /* Directories get nlink 2 at start */
508 inode->i_nlink = 2;
509 /* but ic->pino_nlink is the parent ino# */
510 f->inocache->pino_nlink = dir_i->i_ino;
511
512 ri->data_crc = cpu_to_je32(0);
513 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
514
515 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
516
517 jffs2_free_raw_inode(ri);
518
519 if (IS_ERR(fn)) {
520 /* Eeek. Wave bye bye */
521 mutex_unlock(&f->sem);
522 jffs2_complete_reservation(c);
523 jffs2_clear_inode(inode);
524 return PTR_ERR(fn);
525 }
526 /* No data here. Only a metadata node, which will be
527 obsoleted by the first data write
528 */
529 f->metadata = fn;
530 mutex_unlock(&f->sem);
531
532 jffs2_complete_reservation(c);
533
534 ret = jffs2_init_security(inode, dir_i);
535 if (ret) {
536 jffs2_clear_inode(inode);
537 return ret;
538 }
539 ret = jffs2_init_acl_post(inode);
540 if (ret) {
541 jffs2_clear_inode(inode);
542 return ret;
543 }
544
545 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
546 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
547 if (ret) {
548 /* Eep. */
549 jffs2_clear_inode(inode);
550 return ret;
551 }
552
553 rd = jffs2_alloc_raw_dirent();
554 if (!rd) {
555 /* Argh. Now we treat it like a normal delete */
556 jffs2_complete_reservation(c);
557 jffs2_clear_inode(inode);
558 return -ENOMEM;
559 }
560
561 dir_f = JFFS2_INODE_INFO(dir_i);
562 mutex_lock(&dir_f->sem);
563
564 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
565 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
566 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
567 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
568
569 rd->pino = cpu_to_je32(dir_i->i_ino);
570 rd->version = cpu_to_je32(++dir_f->highest_version);
571 rd->ino = cpu_to_je32(inode->i_ino);
572 rd->mctime = cpu_to_je32(get_seconds());
573 rd->nsize = namelen;
574 rd->type = DT_DIR;
575 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
576 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
577
578 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
579
580 if (IS_ERR(fd)) {
581 /* dirent failed to write. Delete the inode normally
582 as if it were the final unlink() */
583 jffs2_complete_reservation(c);
584 jffs2_free_raw_dirent(rd);
585 mutex_unlock(&dir_f->sem);
586 jffs2_clear_inode(inode);
587 return PTR_ERR(fd);
588 }
589
590 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
591 inc_nlink(dir_i);
592
593 jffs2_free_raw_dirent(rd);
594
595 /* Link the fd into the inode's list, obsoleting an old
596 one if necessary. */
597 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
598
599 mutex_unlock(&dir_f->sem);
600 jffs2_complete_reservation(c);
601
602 d_instantiate(dentry, inode);
603 return 0;
604 }
605
606 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
607 {
608 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
609 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
610 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
611 struct jffs2_full_dirent *fd;
612 int ret;
613 uint32_t now = get_seconds();
614
615 for (fd = f->dents ; fd; fd = fd->next) {
616 if (fd->ino)
617 return -ENOTEMPTY;
618 }
619
620 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
621 dentry->d_name.len, f, now);
622 if (!ret) {
623 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
624 clear_nlink(dentry->d_inode);
625 drop_nlink(dir_i);
626 }
627 return ret;
628 }
629
630 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
631 {
632 struct jffs2_inode_info *f, *dir_f;
633 struct jffs2_sb_info *c;
634 struct inode *inode;
635 struct jffs2_raw_inode *ri;
636 struct jffs2_raw_dirent *rd;
637 struct jffs2_full_dnode *fn;
638 struct jffs2_full_dirent *fd;
639 int namelen;
640 union jffs2_device_node dev;
641 int devlen = 0;
642 uint32_t alloclen;
643 int ret;
644
645 if (!new_valid_dev(rdev))
646 return -EINVAL;
647
648 ri = jffs2_alloc_raw_inode();
649 if (!ri)
650 return -ENOMEM;
651
652 c = JFFS2_SB_INFO(dir_i->i_sb);
653
654 if (S_ISBLK(mode) || S_ISCHR(mode))
655 devlen = jffs2_encode_dev(&dev, rdev);
656
657 /* Try to reserve enough space for both node and dirent.
658 * Just the node will do for now, though
659 */
660 namelen = dentry->d_name.len;
661 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
662 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
663
664 if (ret) {
665 jffs2_free_raw_inode(ri);
666 return ret;
667 }
668
669 inode = jffs2_new_inode(dir_i, mode, ri);
670
671 if (IS_ERR(inode)) {
672 jffs2_free_raw_inode(ri);
673 jffs2_complete_reservation(c);
674 return PTR_ERR(inode);
675 }
676 inode->i_op = &jffs2_file_inode_operations;
677 init_special_inode(inode, inode->i_mode, rdev);
678
679 f = JFFS2_INODE_INFO(inode);
680
681 ri->dsize = ri->csize = cpu_to_je32(devlen);
682 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
683 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
684
685 ri->compr = JFFS2_COMPR_NONE;
686 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
687 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
688
689 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
690
691 jffs2_free_raw_inode(ri);
692
693 if (IS_ERR(fn)) {
694 /* Eeek. Wave bye bye */
695 mutex_unlock(&f->sem);
696 jffs2_complete_reservation(c);
697 jffs2_clear_inode(inode);
698 return PTR_ERR(fn);
699 }
700 /* No data here. Only a metadata node, which will be
701 obsoleted by the first data write
702 */
703 f->metadata = fn;
704 mutex_unlock(&f->sem);
705
706 jffs2_complete_reservation(c);
707
708 ret = jffs2_init_security(inode, dir_i);
709 if (ret) {
710 jffs2_clear_inode(inode);
711 return ret;
712 }
713 ret = jffs2_init_acl_post(inode);
714 if (ret) {
715 jffs2_clear_inode(inode);
716 return ret;
717 }
718
719 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
720 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
721 if (ret) {
722 /* Eep. */
723 jffs2_clear_inode(inode);
724 return ret;
725 }
726
727 rd = jffs2_alloc_raw_dirent();
728 if (!rd) {
729 /* Argh. Now we treat it like a normal delete */
730 jffs2_complete_reservation(c);
731 jffs2_clear_inode(inode);
732 return -ENOMEM;
733 }
734
735 dir_f = JFFS2_INODE_INFO(dir_i);
736 mutex_lock(&dir_f->sem);
737
738 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
739 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
740 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
741 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
742
743 rd->pino = cpu_to_je32(dir_i->i_ino);
744 rd->version = cpu_to_je32(++dir_f->highest_version);
745 rd->ino = cpu_to_je32(inode->i_ino);
746 rd->mctime = cpu_to_je32(get_seconds());
747 rd->nsize = namelen;
748
749 /* XXX: This is ugly. */
750 rd->type = (mode & S_IFMT) >> 12;
751
752 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
753 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
754
755 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
756
757 if (IS_ERR(fd)) {
758 /* dirent failed to write. Delete the inode normally
759 as if it were the final unlink() */
760 jffs2_complete_reservation(c);
761 jffs2_free_raw_dirent(rd);
762 mutex_unlock(&dir_f->sem);
763 jffs2_clear_inode(inode);
764 return PTR_ERR(fd);
765 }
766
767 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
768
769 jffs2_free_raw_dirent(rd);
770
771 /* Link the fd into the inode's list, obsoleting an old
772 one if necessary. */
773 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
774
775 mutex_unlock(&dir_f->sem);
776 jffs2_complete_reservation(c);
777
778 d_instantiate(dentry, inode);
779
780 return 0;
781 }
782
783 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
784 struct inode *new_dir_i, struct dentry *new_dentry)
785 {
786 int ret;
787 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
788 struct jffs2_inode_info *victim_f = NULL;
789 uint8_t type;
790 uint32_t now;
791
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.
796 */
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;
801
802 mutex_lock(&victim_f->sem);
803 for (fd = victim_f->dents; fd; fd = fd->next) {
804 if (fd->ino) {
805 mutex_unlock(&victim_f->sem);
806 return -ENOTEMPTY;
807 }
808 }
809 mutex_unlock(&victim_f->sem);
810 }
811 }
812
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 :)
816 */
817
818 /* Make a hard link */
819
820 /* XXX: This is ugly */
821 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
822 if (!type) type = DT_REG;
823
824 now = get_seconds();
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);
828
829 if (ret)
830 return ret;
831
832 if (victim_f) {
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;
841 else
842 victim_f->inocache->pino_nlink--;
843 mutex_unlock(&victim_f->sem);
844 }
845 }
846
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);
851
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);
855
856 /* We don't touch inode->i_nlink */
857
858 if (ret) {
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);
861 mutex_lock(&f->sem);
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);
866
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 atomic_inc(&old_dentry->d_inode->i_count);
871 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
872 return ret;
873 }
874
875 if (S_ISDIR(old_dentry->d_inode->i_mode))
876 drop_nlink(old_dir_i);
877
878 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
879
880 return 0;
881 }
882
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