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[JFFS2] Quiet lockdep false positive.
[deliverable/linux.git] / fs / jffs2 / dir.c
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 .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, f->inocache->nlink, inode->i_mapping->nrpages));
230 return 0;
231
232 fail:
233 make_bad_inode(inode);
234 iput(inode);
235 jffs2_free_raw_inode(ri);
236 return ret;
237 }
238
239 /***********************************************************************/
240
241
242 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
243 {
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
247 int ret;
248 uint32_t now = get_seconds();
249
250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
251 dentry->d_name.len, dead_f, now);
252 if (dead_f->inocache)
253 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
254 if (!ret)
255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
256 return ret;
257 }
258 /***********************************************************************/
259
260
261 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
262 {
263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
266 int ret;
267 uint8_t type;
268 uint32_t now;
269
270 /* Don't let people make hard links to bad inodes. */
271 if (!f->inocache)
272 return -EIO;
273
274 if (S_ISDIR(old_dentry->d_inode->i_mode))
275 return -EPERM;
276
277 /* XXX: This is ugly */
278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
279 if (!type) type = DT_REG;
280
281 now = get_seconds();
282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
283
284 if (!ret) {
285 mutex_lock(&f->sem);
286 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
287 mutex_unlock(&f->sem);
288 d_instantiate(dentry, old_dentry->d_inode);
289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
290 atomic_inc(&old_dentry->d_inode->i_count);
291 }
292 return ret;
293 }
294
295 /***********************************************************************/
296
297 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
298 {
299 struct jffs2_inode_info *f, *dir_f;
300 struct jffs2_sb_info *c;
301 struct inode *inode;
302 struct jffs2_raw_inode *ri;
303 struct jffs2_raw_dirent *rd;
304 struct jffs2_full_dnode *fn;
305 struct jffs2_full_dirent *fd;
306 int namelen;
307 uint32_t alloclen;
308 int ret, targetlen = strlen(target);
309
310 /* FIXME: If you care. We'd need to use frags for the target
311 if it grows much more than this */
312 if (targetlen > 254)
313 return -EINVAL;
314
315 ri = jffs2_alloc_raw_inode();
316
317 if (!ri)
318 return -ENOMEM;
319
320 c = JFFS2_SB_INFO(dir_i->i_sb);
321
322 /* Try to reserve enough space for both node and dirent.
323 * Just the node will do for now, though
324 */
325 namelen = dentry->d_name.len;
326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
328
329 if (ret) {
330 jffs2_free_raw_inode(ri);
331 return ret;
332 }
333
334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
335
336 if (IS_ERR(inode)) {
337 jffs2_free_raw_inode(ri);
338 jffs2_complete_reservation(c);
339 return PTR_ERR(inode);
340 }
341
342 inode->i_op = &jffs2_symlink_inode_operations;
343
344 f = JFFS2_INODE_INFO(inode);
345
346 inode->i_size = targetlen;
347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
350
351 ri->compr = JFFS2_COMPR_NONE;
352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
354
355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
356
357 jffs2_free_raw_inode(ri);
358
359 if (IS_ERR(fn)) {
360 /* Eeek. Wave bye bye */
361 mutex_unlock(&f->sem);
362 jffs2_complete_reservation(c);
363 jffs2_clear_inode(inode);
364 return PTR_ERR(fn);
365 }
366
367 /* We use f->target field to store the target path. */
368 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
369 if (!f->target) {
370 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
371 mutex_unlock(&f->sem);
372 jffs2_complete_reservation(c);
373 jffs2_clear_inode(inode);
374 return -ENOMEM;
375 }
376
377 memcpy(f->target, target, targetlen + 1);
378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
379
380 /* No data here. Only a metadata node, which will be
381 obsoleted by the first data write
382 */
383 f->metadata = fn;
384 mutex_unlock(&f->sem);
385
386 jffs2_complete_reservation(c);
387
388 ret = jffs2_init_security(inode, dir_i);
389 if (ret) {
390 jffs2_clear_inode(inode);
391 return ret;
392 }
393 ret = jffs2_init_acl_post(inode);
394 if (ret) {
395 jffs2_clear_inode(inode);
396 return ret;
397 }
398
399 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
400 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
401 if (ret) {
402 /* Eep. */
403 jffs2_clear_inode(inode);
404 return ret;
405 }
406
407 rd = jffs2_alloc_raw_dirent();
408 if (!rd) {
409 /* Argh. Now we treat it like a normal delete */
410 jffs2_complete_reservation(c);
411 jffs2_clear_inode(inode);
412 return -ENOMEM;
413 }
414
415 dir_f = JFFS2_INODE_INFO(dir_i);
416 mutex_lock(&dir_f->sem);
417
418 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
419 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
420 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
421 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
422
423 rd->pino = cpu_to_je32(dir_i->i_ino);
424 rd->version = cpu_to_je32(++dir_f->highest_version);
425 rd->ino = cpu_to_je32(inode->i_ino);
426 rd->mctime = cpu_to_je32(get_seconds());
427 rd->nsize = namelen;
428 rd->type = DT_LNK;
429 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
430 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
431
432 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
433
434 if (IS_ERR(fd)) {
435 /* dirent failed to write. Delete the inode normally
436 as if it were the final unlink() */
437 jffs2_complete_reservation(c);
438 jffs2_free_raw_dirent(rd);
439 mutex_unlock(&dir_f->sem);
440 jffs2_clear_inode(inode);
441 return PTR_ERR(fd);
442 }
443
444 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
445
446 jffs2_free_raw_dirent(rd);
447
448 /* Link the fd into the inode's list, obsoleting an old
449 one if necessary. */
450 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
451
452 mutex_unlock(&dir_f->sem);
453 jffs2_complete_reservation(c);
454
455 d_instantiate(dentry, inode);
456 return 0;
457 }
458
459
460 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
461 {
462 struct jffs2_inode_info *f, *dir_f;
463 struct jffs2_sb_info *c;
464 struct inode *inode;
465 struct jffs2_raw_inode *ri;
466 struct jffs2_raw_dirent *rd;
467 struct jffs2_full_dnode *fn;
468 struct jffs2_full_dirent *fd;
469 int namelen;
470 uint32_t alloclen;
471 int ret;
472
473 mode |= S_IFDIR;
474
475 ri = jffs2_alloc_raw_inode();
476 if (!ri)
477 return -ENOMEM;
478
479 c = JFFS2_SB_INFO(dir_i->i_sb);
480
481 /* Try to reserve enough space for both node and dirent.
482 * Just the node will do for now, though
483 */
484 namelen = dentry->d_name.len;
485 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
486 JFFS2_SUMMARY_INODE_SIZE);
487
488 if (ret) {
489 jffs2_free_raw_inode(ri);
490 return ret;
491 }
492
493 inode = jffs2_new_inode(dir_i, mode, ri);
494
495 if (IS_ERR(inode)) {
496 jffs2_free_raw_inode(ri);
497 jffs2_complete_reservation(c);
498 return PTR_ERR(inode);
499 }
500
501 inode->i_op = &jffs2_dir_inode_operations;
502 inode->i_fop = &jffs2_dir_operations;
503 /* Directories get nlink 2 at start */
504 inode->i_nlink = 2;
505
506 f = JFFS2_INODE_INFO(inode);
507
508 ri->data_crc = cpu_to_je32(0);
509 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
510
511 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
512
513 jffs2_free_raw_inode(ri);
514
515 if (IS_ERR(fn)) {
516 /* Eeek. Wave bye bye */
517 mutex_unlock(&f->sem);
518 jffs2_complete_reservation(c);
519 jffs2_clear_inode(inode);
520 return PTR_ERR(fn);
521 }
522 /* No data here. Only a metadata node, which will be
523 obsoleted by the first data write
524 */
525 f->metadata = fn;
526 mutex_unlock(&f->sem);
527
528 jffs2_complete_reservation(c);
529
530 ret = jffs2_init_security(inode, dir_i);
531 if (ret) {
532 jffs2_clear_inode(inode);
533 return ret;
534 }
535 ret = jffs2_init_acl_post(inode);
536 if (ret) {
537 jffs2_clear_inode(inode);
538 return ret;
539 }
540
541 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
542 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
543 if (ret) {
544 /* Eep. */
545 jffs2_clear_inode(inode);
546 return ret;
547 }
548
549 rd = jffs2_alloc_raw_dirent();
550 if (!rd) {
551 /* Argh. Now we treat it like a normal delete */
552 jffs2_complete_reservation(c);
553 jffs2_clear_inode(inode);
554 return -ENOMEM;
555 }
556
557 dir_f = JFFS2_INODE_INFO(dir_i);
558 mutex_lock(&dir_f->sem);
559
560 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
561 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
562 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
563 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
564
565 rd->pino = cpu_to_je32(dir_i->i_ino);
566 rd->version = cpu_to_je32(++dir_f->highest_version);
567 rd->ino = cpu_to_je32(inode->i_ino);
568 rd->mctime = cpu_to_je32(get_seconds());
569 rd->nsize = namelen;
570 rd->type = DT_DIR;
571 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
572 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
573
574 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
575
576 if (IS_ERR(fd)) {
577 /* dirent failed to write. Delete the inode normally
578 as if it were the final unlink() */
579 jffs2_complete_reservation(c);
580 jffs2_free_raw_dirent(rd);
581 mutex_unlock(&dir_f->sem);
582 jffs2_clear_inode(inode);
583 return PTR_ERR(fd);
584 }
585
586 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
587 inc_nlink(dir_i);
588
589 jffs2_free_raw_dirent(rd);
590
591 /* Link the fd into the inode's list, obsoleting an old
592 one if necessary. */
593 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
594
595 mutex_unlock(&dir_f->sem);
596 jffs2_complete_reservation(c);
597
598 d_instantiate(dentry, inode);
599 return 0;
600 }
601
602 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
603 {
604 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
605 struct jffs2_full_dirent *fd;
606 int ret;
607
608 for (fd = f->dents ; fd; fd = fd->next) {
609 if (fd->ino)
610 return -ENOTEMPTY;
611 }
612 ret = jffs2_unlink(dir_i, dentry);
613 if (!ret)
614 drop_nlink(dir_i);
615 return ret;
616 }
617
618 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
619 {
620 struct jffs2_inode_info *f, *dir_f;
621 struct jffs2_sb_info *c;
622 struct inode *inode;
623 struct jffs2_raw_inode *ri;
624 struct jffs2_raw_dirent *rd;
625 struct jffs2_full_dnode *fn;
626 struct jffs2_full_dirent *fd;
627 int namelen;
628 union jffs2_device_node dev;
629 int devlen = 0;
630 uint32_t alloclen;
631 int ret;
632
633 if (!new_valid_dev(rdev))
634 return -EINVAL;
635
636 ri = jffs2_alloc_raw_inode();
637 if (!ri)
638 return -ENOMEM;
639
640 c = JFFS2_SB_INFO(dir_i->i_sb);
641
642 if (S_ISBLK(mode) || S_ISCHR(mode))
643 devlen = jffs2_encode_dev(&dev, rdev);
644
645 /* Try to reserve enough space for both node and dirent.
646 * Just the node will do for now, though
647 */
648 namelen = dentry->d_name.len;
649 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
650 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
651
652 if (ret) {
653 jffs2_free_raw_inode(ri);
654 return ret;
655 }
656
657 inode = jffs2_new_inode(dir_i, mode, ri);
658
659 if (IS_ERR(inode)) {
660 jffs2_free_raw_inode(ri);
661 jffs2_complete_reservation(c);
662 return PTR_ERR(inode);
663 }
664 inode->i_op = &jffs2_file_inode_operations;
665 init_special_inode(inode, inode->i_mode, rdev);
666
667 f = JFFS2_INODE_INFO(inode);
668
669 ri->dsize = ri->csize = cpu_to_je32(devlen);
670 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
671 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
672
673 ri->compr = JFFS2_COMPR_NONE;
674 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
675 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
676
677 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
678
679 jffs2_free_raw_inode(ri);
680
681 if (IS_ERR(fn)) {
682 /* Eeek. Wave bye bye */
683 mutex_unlock(&f->sem);
684 jffs2_complete_reservation(c);
685 jffs2_clear_inode(inode);
686 return PTR_ERR(fn);
687 }
688 /* No data here. Only a metadata node, which will be
689 obsoleted by the first data write
690 */
691 f->metadata = fn;
692 mutex_unlock(&f->sem);
693
694 jffs2_complete_reservation(c);
695
696 ret = jffs2_init_security(inode, dir_i);
697 if (ret) {
698 jffs2_clear_inode(inode);
699 return ret;
700 }
701 ret = jffs2_init_acl_post(inode);
702 if (ret) {
703 jffs2_clear_inode(inode);
704 return ret;
705 }
706
707 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
708 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
709 if (ret) {
710 /* Eep. */
711 jffs2_clear_inode(inode);
712 return ret;
713 }
714
715 rd = jffs2_alloc_raw_dirent();
716 if (!rd) {
717 /* Argh. Now we treat it like a normal delete */
718 jffs2_complete_reservation(c);
719 jffs2_clear_inode(inode);
720 return -ENOMEM;
721 }
722
723 dir_f = JFFS2_INODE_INFO(dir_i);
724 mutex_lock(&dir_f->sem);
725
726 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
727 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
728 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
729 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
730
731 rd->pino = cpu_to_je32(dir_i->i_ino);
732 rd->version = cpu_to_je32(++dir_f->highest_version);
733 rd->ino = cpu_to_je32(inode->i_ino);
734 rd->mctime = cpu_to_je32(get_seconds());
735 rd->nsize = namelen;
736
737 /* XXX: This is ugly. */
738 rd->type = (mode & S_IFMT) >> 12;
739
740 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
741 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
742
743 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
744
745 if (IS_ERR(fd)) {
746 /* dirent failed to write. Delete the inode normally
747 as if it were the final unlink() */
748 jffs2_complete_reservation(c);
749 jffs2_free_raw_dirent(rd);
750 mutex_unlock(&dir_f->sem);
751 jffs2_clear_inode(inode);
752 return PTR_ERR(fd);
753 }
754
755 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
756
757 jffs2_free_raw_dirent(rd);
758
759 /* Link the fd into the inode's list, obsoleting an old
760 one if necessary. */
761 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
762
763 mutex_unlock(&dir_f->sem);
764 jffs2_complete_reservation(c);
765
766 d_instantiate(dentry, inode);
767
768 return 0;
769 }
770
771 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
772 struct inode *new_dir_i, struct dentry *new_dentry)
773 {
774 int ret;
775 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
776 struct jffs2_inode_info *victim_f = NULL;
777 uint8_t type;
778 uint32_t now;
779
780 /* The VFS will check for us and prevent trying to rename a
781 * file over a directory and vice versa, but if it's a directory,
782 * the VFS can't check whether the victim is empty. The filesystem
783 * needs to do that for itself.
784 */
785 if (new_dentry->d_inode) {
786 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
787 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
788 struct jffs2_full_dirent *fd;
789
790 mutex_lock(&victim_f->sem);
791 for (fd = victim_f->dents; fd; fd = fd->next) {
792 if (fd->ino) {
793 mutex_unlock(&victim_f->sem);
794 return -ENOTEMPTY;
795 }
796 }
797 mutex_unlock(&victim_f->sem);
798 }
799 }
800
801 /* XXX: We probably ought to alloc enough space for
802 both nodes at the same time. Writing the new link,
803 then getting -ENOSPC, is quite bad :)
804 */
805
806 /* Make a hard link */
807
808 /* XXX: This is ugly */
809 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
810 if (!type) type = DT_REG;
811
812 now = get_seconds();
813 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
814 old_dentry->d_inode->i_ino, type,
815 new_dentry->d_name.name, new_dentry->d_name.len, now);
816
817 if (ret)
818 return ret;
819
820 if (victim_f) {
821 /* There was a victim. Kill it off nicely */
822 drop_nlink(new_dentry->d_inode);
823 /* Don't oops if the victim was a dirent pointing to an
824 inode which didn't exist. */
825 if (victim_f->inocache) {
826 mutex_lock(&victim_f->sem);
827 victim_f->inocache->nlink--;
828 mutex_unlock(&victim_f->sem);
829 }
830 }
831
832 /* If it was a directory we moved, and there was no victim,
833 increase i_nlink on its new parent */
834 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
835 inc_nlink(new_dir_i);
836
837 /* Unlink the original */
838 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
839 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
840
841 /* We don't touch inode->i_nlink */
842
843 if (ret) {
844 /* Oh shit. We really ought to make a single node which can do both atomically */
845 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
846 mutex_lock(&f->sem);
847 inc_nlink(old_dentry->d_inode);
848 if (f->inocache)
849 f->inocache->nlink++;
850 mutex_unlock(&f->sem);
851
852 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
853 /* Might as well let the VFS know */
854 d_instantiate(new_dentry, old_dentry->d_inode);
855 atomic_inc(&old_dentry->d_inode->i_count);
856 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
857 return ret;
858 }
859
860 if (S_ISDIR(old_dentry->d_inode->i_mode))
861 drop_nlink(old_dir_i);
862
863 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
864
865 return 0;
866 }
867
Linux kernel - Deliverables
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