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[mirror_ubuntu-artful-kernel.git] / fs / jffs2 / dir.c
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/fs.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>
23 #include "nodelist.h"
24
25 static int jffs2_readdir (struct file *, struct dir_context *);
26
27 static int jffs2_create (struct inode *,struct dentry *,umode_t,
28 bool);
29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 unsigned int);
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 *);
39
40 const struct file_operations jffs2_dir_operations =
41 {
42 .read = generic_read_dir,
43 .iterate = jffs2_readdir,
44 .unlocked_ioctl=jffs2_ioctl,
45 .fsync = jffs2_fsync,
46 .llseek = generic_file_llseek,
47 };
48
49
50 const struct inode_operations jffs2_dir_inode_operations =
51 {
52 .create = jffs2_create,
53 .lookup = jffs2_lookup,
54 .link = jffs2_link,
55 .unlink = jffs2_unlink,
56 .symlink = jffs2_symlink,
57 .mkdir = jffs2_mkdir,
58 .rmdir = jffs2_rmdir,
59 .mknod = jffs2_mknod,
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
68 };
69
70 /***********************************************************************/
71
72
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
75 nice and simple
76 */
77 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
78 unsigned int flags)
79 {
80 struct jffs2_inode_info *dir_f;
81 struct jffs2_full_dirent *fd = NULL, *fd_list;
82 uint32_t ino = 0;
83 struct inode *inode = NULL;
84
85 jffs2_dbg(1, "jffs2_lookup()\n");
86
87 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
88 return ERR_PTR(-ENAMETOOLONG);
89
90 dir_f = JFFS2_INODE_INFO(dir_i);
91
92 mutex_lock(&dir_f->sem);
93
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)) {
100 fd = fd_list;
101 }
102 }
103 if (fd)
104 ino = fd->ino;
105 mutex_unlock(&dir_f->sem);
106 if (ino) {
107 inode = jffs2_iget(dir_i->i_sb, ino);
108 if (IS_ERR(inode))
109 pr_warn("iget() failed for ino #%u\n", ino);
110 }
111
112 return d_splice_alias(inode, target);
113 }
114
115 /***********************************************************************/
116
117
118 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
119 {
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;
124
125 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
126
127 if (!dir_emit_dots(file, ctx))
128 return 0;
129
130 mutex_lock(&f->sem);
131 for (fd = f->dents; fd; fd = fd->next) {
132 curofs++;
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);
137 continue;
138 }
139 if (!fd->ino) {
140 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
141 fd->name);
142 ctx->pos++;
143 continue;
144 }
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))
148 break;
149 ctx->pos++;
150 }
151 mutex_unlock(&f->sem);
152 return 0;
153 }
154
155 /***********************************************************************/
156
157
158 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
159 umode_t mode, bool excl)
160 {
161 struct jffs2_raw_inode *ri;
162 struct jffs2_inode_info *f, *dir_f;
163 struct jffs2_sb_info *c;
164 struct inode *inode;
165 int ret;
166
167 ri = jffs2_alloc_raw_inode();
168 if (!ri)
169 return -ENOMEM;
170
171 c = JFFS2_SB_INFO(dir_i->i_sb);
172
173 jffs2_dbg(1, "%s()\n", __func__);
174
175 inode = jffs2_new_inode(dir_i, mode, ri);
176
177 if (IS_ERR(inode)) {
178 jffs2_dbg(1, "jffs2_new_inode() failed\n");
179 jffs2_free_raw_inode(ri);
180 return PTR_ERR(inode);
181 }
182
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;
187
188 f = JFFS2_INODE_INFO(inode);
189 dir_f = JFFS2_INODE_INFO(dir_i);
190
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);
197
198 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
199 if (ret)
200 goto fail;
201
202 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
203
204 jffs2_free_raw_inode(ri);
205
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);
209
210 unlock_new_inode(inode);
211 d_instantiate(dentry, inode);
212 return 0;
213
214 fail:
215 iget_failed(inode);
216 jffs2_free_raw_inode(ri);
217 return ret;
218 }
219
220 /***********************************************************************/
221
222
223 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
224 {
225 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
226 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
227 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
228 int ret;
229 uint32_t now = get_seconds();
230
231 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
232 dentry->d_name.len, dead_f, now);
233 if (dead_f->inocache)
234 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
235 if (!ret)
236 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
237 return ret;
238 }
239 /***********************************************************************/
240
241
242 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
243 {
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(d_inode(old_dentry)->i_sb);
245 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
247 int ret;
248 uint8_t type;
249 uint32_t now;
250
251 /* Don't let people make hard links to bad inodes. */
252 if (!f->inocache)
253 return -EIO;
254
255 if (d_is_dir(old_dentry))
256 return -EPERM;
257
258 /* XXX: This is ugly */
259 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
260 if (!type) type = DT_REG;
261
262 now = get_seconds();
263 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
264
265 if (!ret) {
266 mutex_lock(&f->sem);
267 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
268 mutex_unlock(&f->sem);
269 d_instantiate(dentry, d_inode(old_dentry));
270 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
271 ihold(d_inode(old_dentry));
272 }
273 return ret;
274 }
275
276 /***********************************************************************/
277
278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
279 {
280 struct jffs2_inode_info *f, *dir_f;
281 struct jffs2_sb_info *c;
282 struct inode *inode;
283 struct jffs2_raw_inode *ri;
284 struct jffs2_raw_dirent *rd;
285 struct jffs2_full_dnode *fn;
286 struct jffs2_full_dirent *fd;
287 int namelen;
288 uint32_t alloclen;
289 int ret, targetlen = strlen(target);
290
291 /* FIXME: If you care. We'd need to use frags for the target
292 if it grows much more than this */
293 if (targetlen > 254)
294 return -ENAMETOOLONG;
295
296 ri = jffs2_alloc_raw_inode();
297
298 if (!ri)
299 return -ENOMEM;
300
301 c = JFFS2_SB_INFO(dir_i->i_sb);
302
303 /* Try to reserve enough space for both node and dirent.
304 * Just the node will do for now, though
305 */
306 namelen = dentry->d_name.len;
307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
308 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
309
310 if (ret) {
311 jffs2_free_raw_inode(ri);
312 return ret;
313 }
314
315 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
316
317 if (IS_ERR(inode)) {
318 jffs2_free_raw_inode(ri);
319 jffs2_complete_reservation(c);
320 return PTR_ERR(inode);
321 }
322
323 inode->i_op = &jffs2_symlink_inode_operations;
324
325 f = JFFS2_INODE_INFO(inode);
326
327 inode->i_size = targetlen;
328 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
329 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
330 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
331
332 ri->compr = JFFS2_COMPR_NONE;
333 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
334 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
335
336 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
337
338 jffs2_free_raw_inode(ri);
339
340 if (IS_ERR(fn)) {
341 /* Eeek. Wave bye bye */
342 mutex_unlock(&f->sem);
343 jffs2_complete_reservation(c);
344 ret = PTR_ERR(fn);
345 goto fail;
346 }
347
348 /* We use f->target field to store the target path. */
349 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
350 if (!f->target) {
351 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
352 mutex_unlock(&f->sem);
353 jffs2_complete_reservation(c);
354 ret = -ENOMEM;
355 goto fail;
356 }
357 inode->i_link = f->target;
358
359 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
360 __func__, (char *)f->target);
361
362 /* No data here. Only a metadata node, which will be
363 obsoleted by the first data write
364 */
365 f->metadata = fn;
366 mutex_unlock(&f->sem);
367
368 jffs2_complete_reservation(c);
369
370 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
371 if (ret)
372 goto fail;
373
374 ret = jffs2_init_acl_post(inode);
375 if (ret)
376 goto fail;
377
378 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
379 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
380 if (ret)
381 goto fail;
382
383 rd = jffs2_alloc_raw_dirent();
384 if (!rd) {
385 /* Argh. Now we treat it like a normal delete */
386 jffs2_complete_reservation(c);
387 ret = -ENOMEM;
388 goto fail;
389 }
390
391 dir_f = JFFS2_INODE_INFO(dir_i);
392 mutex_lock(&dir_f->sem);
393
394 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
395 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
396 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
397 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
398
399 rd->pino = cpu_to_je32(dir_i->i_ino);
400 rd->version = cpu_to_je32(++dir_f->highest_version);
401 rd->ino = cpu_to_je32(inode->i_ino);
402 rd->mctime = cpu_to_je32(get_seconds());
403 rd->nsize = namelen;
404 rd->type = DT_LNK;
405 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
406 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
407
408 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
409
410 if (IS_ERR(fd)) {
411 /* dirent failed to write. Delete the inode normally
412 as if it were the final unlink() */
413 jffs2_complete_reservation(c);
414 jffs2_free_raw_dirent(rd);
415 mutex_unlock(&dir_f->sem);
416 ret = PTR_ERR(fd);
417 goto fail;
418 }
419
420 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
421
422 jffs2_free_raw_dirent(rd);
423
424 /* Link the fd into the inode's list, obsoleting an old
425 one if necessary. */
426 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
427
428 mutex_unlock(&dir_f->sem);
429 jffs2_complete_reservation(c);
430
431 unlock_new_inode(inode);
432 d_instantiate(dentry, inode);
433 return 0;
434
435 fail:
436 iget_failed(inode);
437 return ret;
438 }
439
440
441 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
442 {
443 struct jffs2_inode_info *f, *dir_f;
444 struct jffs2_sb_info *c;
445 struct inode *inode;
446 struct jffs2_raw_inode *ri;
447 struct jffs2_raw_dirent *rd;
448 struct jffs2_full_dnode *fn;
449 struct jffs2_full_dirent *fd;
450 int namelen;
451 uint32_t alloclen;
452 int ret;
453
454 mode |= S_IFDIR;
455
456 ri = jffs2_alloc_raw_inode();
457 if (!ri)
458 return -ENOMEM;
459
460 c = JFFS2_SB_INFO(dir_i->i_sb);
461
462 /* Try to reserve enough space for both node and dirent.
463 * Just the node will do for now, though
464 */
465 namelen = dentry->d_name.len;
466 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
467 JFFS2_SUMMARY_INODE_SIZE);
468
469 if (ret) {
470 jffs2_free_raw_inode(ri);
471 return ret;
472 }
473
474 inode = jffs2_new_inode(dir_i, mode, ri);
475
476 if (IS_ERR(inode)) {
477 jffs2_free_raw_inode(ri);
478 jffs2_complete_reservation(c);
479 return PTR_ERR(inode);
480 }
481
482 inode->i_op = &jffs2_dir_inode_operations;
483 inode->i_fop = &jffs2_dir_operations;
484
485 f = JFFS2_INODE_INFO(inode);
486
487 /* Directories get nlink 2 at start */
488 set_nlink(inode, 2);
489 /* but ic->pino_nlink is the parent ino# */
490 f->inocache->pino_nlink = dir_i->i_ino;
491
492 ri->data_crc = cpu_to_je32(0);
493 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
494
495 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
496
497 jffs2_free_raw_inode(ri);
498
499 if (IS_ERR(fn)) {
500 /* Eeek. Wave bye bye */
501 mutex_unlock(&f->sem);
502 jffs2_complete_reservation(c);
503 ret = PTR_ERR(fn);
504 goto fail;
505 }
506 /* No data here. Only a metadata node, which will be
507 obsoleted by the first data write
508 */
509 f->metadata = fn;
510 mutex_unlock(&f->sem);
511
512 jffs2_complete_reservation(c);
513
514 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
515 if (ret)
516 goto fail;
517
518 ret = jffs2_init_acl_post(inode);
519 if (ret)
520 goto fail;
521
522 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
523 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
524 if (ret)
525 goto fail;
526
527 rd = jffs2_alloc_raw_dirent();
528 if (!rd) {
529 /* Argh. Now we treat it like a normal delete */
530 jffs2_complete_reservation(c);
531 ret = -ENOMEM;
532 goto fail;
533 }
534
535 dir_f = JFFS2_INODE_INFO(dir_i);
536 mutex_lock(&dir_f->sem);
537
538 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
539 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
540 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
541 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
542
543 rd->pino = cpu_to_je32(dir_i->i_ino);
544 rd->version = cpu_to_je32(++dir_f->highest_version);
545 rd->ino = cpu_to_je32(inode->i_ino);
546 rd->mctime = cpu_to_je32(get_seconds());
547 rd->nsize = namelen;
548 rd->type = DT_DIR;
549 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
550 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
551
552 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
553
554 if (IS_ERR(fd)) {
555 /* dirent failed to write. Delete the inode normally
556 as if it were the final unlink() */
557 jffs2_complete_reservation(c);
558 jffs2_free_raw_dirent(rd);
559 mutex_unlock(&dir_f->sem);
560 ret = PTR_ERR(fd);
561 goto fail;
562 }
563
564 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
565 inc_nlink(dir_i);
566
567 jffs2_free_raw_dirent(rd);
568
569 /* Link the fd into the inode's list, obsoleting an old
570 one if necessary. */
571 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
572
573 mutex_unlock(&dir_f->sem);
574 jffs2_complete_reservation(c);
575
576 unlock_new_inode(inode);
577 d_instantiate(dentry, inode);
578 return 0;
579
580 fail:
581 iget_failed(inode);
582 return ret;
583 }
584
585 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
586 {
587 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
588 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
589 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
590 struct jffs2_full_dirent *fd;
591 int ret;
592 uint32_t now = get_seconds();
593
594 for (fd = f->dents ; fd; fd = fd->next) {
595 if (fd->ino)
596 return -ENOTEMPTY;
597 }
598
599 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
600 dentry->d_name.len, f, now);
601 if (!ret) {
602 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
603 clear_nlink(d_inode(dentry));
604 drop_nlink(dir_i);
605 }
606 return ret;
607 }
608
609 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
610 {
611 struct jffs2_inode_info *f, *dir_f;
612 struct jffs2_sb_info *c;
613 struct inode *inode;
614 struct jffs2_raw_inode *ri;
615 struct jffs2_raw_dirent *rd;
616 struct jffs2_full_dnode *fn;
617 struct jffs2_full_dirent *fd;
618 int namelen;
619 union jffs2_device_node dev;
620 int devlen = 0;
621 uint32_t alloclen;
622 int ret;
623
624 if (!new_valid_dev(rdev))
625 return -EINVAL;
626
627 ri = jffs2_alloc_raw_inode();
628 if (!ri)
629 return -ENOMEM;
630
631 c = JFFS2_SB_INFO(dir_i->i_sb);
632
633 if (S_ISBLK(mode) || S_ISCHR(mode))
634 devlen = jffs2_encode_dev(&dev, rdev);
635
636 /* Try to reserve enough space for both node and dirent.
637 * Just the node will do for now, though
638 */
639 namelen = dentry->d_name.len;
640 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
641 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
642
643 if (ret) {
644 jffs2_free_raw_inode(ri);
645 return ret;
646 }
647
648 inode = jffs2_new_inode(dir_i, mode, ri);
649
650 if (IS_ERR(inode)) {
651 jffs2_free_raw_inode(ri);
652 jffs2_complete_reservation(c);
653 return PTR_ERR(inode);
654 }
655 inode->i_op = &jffs2_file_inode_operations;
656 init_special_inode(inode, inode->i_mode, rdev);
657
658 f = JFFS2_INODE_INFO(inode);
659
660 ri->dsize = ri->csize = cpu_to_je32(devlen);
661 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
662 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
663
664 ri->compr = JFFS2_COMPR_NONE;
665 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
666 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
667
668 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
669
670 jffs2_free_raw_inode(ri);
671
672 if (IS_ERR(fn)) {
673 /* Eeek. Wave bye bye */
674 mutex_unlock(&f->sem);
675 jffs2_complete_reservation(c);
676 ret = PTR_ERR(fn);
677 goto fail;
678 }
679 /* No data here. Only a metadata node, which will be
680 obsoleted by the first data write
681 */
682 f->metadata = fn;
683 mutex_unlock(&f->sem);
684
685 jffs2_complete_reservation(c);
686
687 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
688 if (ret)
689 goto fail;
690
691 ret = jffs2_init_acl_post(inode);
692 if (ret)
693 goto fail;
694
695 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
696 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
697 if (ret)
698 goto fail;
699
700 rd = jffs2_alloc_raw_dirent();
701 if (!rd) {
702 /* Argh. Now we treat it like a normal delete */
703 jffs2_complete_reservation(c);
704 ret = -ENOMEM;
705 goto fail;
706 }
707
708 dir_f = JFFS2_INODE_INFO(dir_i);
709 mutex_lock(&dir_f->sem);
710
711 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
712 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
713 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
714 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
715
716 rd->pino = cpu_to_je32(dir_i->i_ino);
717 rd->version = cpu_to_je32(++dir_f->highest_version);
718 rd->ino = cpu_to_je32(inode->i_ino);
719 rd->mctime = cpu_to_je32(get_seconds());
720 rd->nsize = namelen;
721
722 /* XXX: This is ugly. */
723 rd->type = (mode & S_IFMT) >> 12;
724
725 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
726 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
727
728 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
729
730 if (IS_ERR(fd)) {
731 /* dirent failed to write. Delete the inode normally
732 as if it were the final unlink() */
733 jffs2_complete_reservation(c);
734 jffs2_free_raw_dirent(rd);
735 mutex_unlock(&dir_f->sem);
736 ret = PTR_ERR(fd);
737 goto fail;
738 }
739
740 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
741
742 jffs2_free_raw_dirent(rd);
743
744 /* Link the fd into the inode's list, obsoleting an old
745 one if necessary. */
746 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
747
748 mutex_unlock(&dir_f->sem);
749 jffs2_complete_reservation(c);
750
751 unlock_new_inode(inode);
752 d_instantiate(dentry, inode);
753 return 0;
754
755 fail:
756 iget_failed(inode);
757 return ret;
758 }
759
760 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
761 struct inode *new_dir_i, struct dentry *new_dentry)
762 {
763 int ret;
764 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
765 struct jffs2_inode_info *victim_f = NULL;
766 uint8_t type;
767 uint32_t now;
768
769 /* The VFS will check for us and prevent trying to rename a
770 * file over a directory and vice versa, but if it's a directory,
771 * the VFS can't check whether the victim is empty. The filesystem
772 * needs to do that for itself.
773 */
774 if (d_really_is_positive(new_dentry)) {
775 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
776 if (d_is_dir(new_dentry)) {
777 struct jffs2_full_dirent *fd;
778
779 mutex_lock(&victim_f->sem);
780 for (fd = victim_f->dents; fd; fd = fd->next) {
781 if (fd->ino) {
782 mutex_unlock(&victim_f->sem);
783 return -ENOTEMPTY;
784 }
785 }
786 mutex_unlock(&victim_f->sem);
787 }
788 }
789
790 /* XXX: We probably ought to alloc enough space for
791 both nodes at the same time. Writing the new link,
792 then getting -ENOSPC, is quite bad :)
793 */
794
795 /* Make a hard link */
796
797 /* XXX: This is ugly */
798 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
799 if (!type) type = DT_REG;
800
801 now = get_seconds();
802 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
803 d_inode(old_dentry)->i_ino, type,
804 new_dentry->d_name.name, new_dentry->d_name.len, now);
805
806 if (ret)
807 return ret;
808
809 if (victim_f) {
810 /* There was a victim. Kill it off nicely */
811 if (d_is_dir(new_dentry))
812 clear_nlink(d_inode(new_dentry));
813 else
814 drop_nlink(d_inode(new_dentry));
815 /* Don't oops if the victim was a dirent pointing to an
816 inode which didn't exist. */
817 if (victim_f->inocache) {
818 mutex_lock(&victim_f->sem);
819 if (d_is_dir(new_dentry))
820 victim_f->inocache->pino_nlink = 0;
821 else
822 victim_f->inocache->pino_nlink--;
823 mutex_unlock(&victim_f->sem);
824 }
825 }
826
827 /* If it was a directory we moved, and there was no victim,
828 increase i_nlink on its new parent */
829 if (d_is_dir(old_dentry) && !victim_f)
830 inc_nlink(new_dir_i);
831
832 /* Unlink the original */
833 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
834 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
835
836 /* We don't touch inode->i_nlink */
837
838 if (ret) {
839 /* Oh shit. We really ought to make a single node which can do both atomically */
840 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
841 mutex_lock(&f->sem);
842 inc_nlink(d_inode(old_dentry));
843 if (f->inocache && !d_is_dir(old_dentry))
844 f->inocache->pino_nlink++;
845 mutex_unlock(&f->sem);
846
847 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
848 __func__, ret);
849 /* Might as well let the VFS know */
850 d_instantiate(new_dentry, d_inode(old_dentry));
851 ihold(d_inode(old_dentry));
852 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
853 return ret;
854 }
855
856 if (d_is_dir(old_dentry))
857 drop_nlink(old_dir_i);
858
859 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
860
861 return 0;
862 }
863