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 mnt_idmap *, struct inode *,
28 struct dentry *, umode_t, 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 mnt_idmap *, struct inode *,
34 struct dentry *, const char *);
35 static int jffs2_mkdir (struct mnt_idmap *, struct inode *,struct dentry *,
36 umode_t);
37 static int jffs2_rmdir (struct inode *,struct dentry *);
38 static int jffs2_mknod (struct mnt_idmap *, struct inode *,struct dentry *,
39 umode_t,dev_t);
40 static int jffs2_rename (struct mnt_idmap *, struct inode *,
41 struct dentry *, struct inode *, struct dentry *,
42 unsigned int);
43
44 const struct file_operations jffs2_dir_operations =
45 {
46 .read = generic_read_dir,
47 .iterate_shared=jffs2_readdir,
48 .unlocked_ioctl=jffs2_ioctl,
49 .fsync = jffs2_fsync,
50 .llseek = generic_file_llseek,
51 };
52
53
54 const struct inode_operations jffs2_dir_inode_operations =
55 {
56 .create = jffs2_create,
57 .lookup = jffs2_lookup,
58 .link = jffs2_link,
59 .unlink = jffs2_unlink,
60 .symlink = jffs2_symlink,
61 .mkdir = jffs2_mkdir,
62 .rmdir = jffs2_rmdir,
63 .mknod = jffs2_mknod,
64 .rename = jffs2_rename,
65 .get_inode_acl = jffs2_get_acl,
66 .set_acl = jffs2_set_acl,
67 .setattr = jffs2_setattr,
68 .listxattr = jffs2_listxattr,
69 };
70
71 /***********************************************************************/
72
73
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
76 nice and simple
77 */
jffs2_lookup(struct inode * dir_i,struct dentry * target,unsigned int flags)78 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
79 unsigned int flags)
80 {
81 struct jffs2_inode_info *dir_f;
82 struct jffs2_full_dirent *fd = NULL, *fd_list;
83 uint32_t ino = 0;
84 struct inode *inode = NULL;
85 unsigned int nhash;
86
87 jffs2_dbg(1, "jffs2_lookup()\n");
88
89 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
90 return ERR_PTR(-ENAMETOOLONG);
91
92 dir_f = JFFS2_INODE_INFO(dir_i);
93
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);
96
97 mutex_lock(&dir_f->sem);
98
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)) {
105 fd = fd_list;
106 }
107 }
108 if (fd)
109 ino = fd->ino;
110 mutex_unlock(&dir_f->sem);
111 if (ino) {
112 inode = jffs2_iget(dir_i->i_sb, ino);
113 if (IS_ERR(inode))
114 pr_warn("iget() failed for ino #%u\n", ino);
115 }
116
117 return d_splice_alias(inode, target);
118 }
119
120 /***********************************************************************/
121
122
jffs2_readdir(struct file * file,struct dir_context * ctx)123 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
124 {
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;
129
130 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
131
132 if (!dir_emit_dots(file, ctx))
133 return 0;
134
135 mutex_lock(&f->sem);
136 for (fd = f->dents; fd; fd = fd->next) {
137 curofs++;
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);
142 continue;
143 }
144 if (!fd->ino) {
145 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
146 fd->name);
147 ctx->pos++;
148 continue;
149 }
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))
153 break;
154 ctx->pos++;
155 }
156 mutex_unlock(&f->sem);
157 return 0;
158 }
159
160 /***********************************************************************/
161
162
jffs2_create(struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode,bool excl)163 static int jffs2_create(struct mnt_idmap *idmap, struct inode *dir_i,
164 struct dentry *dentry, umode_t mode, bool excl)
165 {
166 struct jffs2_raw_inode *ri;
167 struct jffs2_inode_info *f, *dir_f;
168 struct jffs2_sb_info *c;
169 struct inode *inode;
170 int ret;
171
172 ri = jffs2_alloc_raw_inode();
173 if (!ri)
174 return -ENOMEM;
175
176 c = JFFS2_SB_INFO(dir_i->i_sb);
177
178 jffs2_dbg(1, "%s()\n", __func__);
179
180 inode = jffs2_new_inode(dir_i, mode, ri);
181
182 if (IS_ERR(inode)) {
183 jffs2_dbg(1, "jffs2_new_inode() failed\n");
184 jffs2_free_raw_inode(ri);
185 return PTR_ERR(inode);
186 }
187
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;
192
193 f = JFFS2_INODE_INFO(inode);
194 dir_f = JFFS2_INODE_INFO(dir_i);
195
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);
202
203 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
204 if (ret)
205 goto fail;
206
207 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i,
208 ITIME(je32_to_cpu(ri->ctime)));
209
210 jffs2_free_raw_inode(ri);
211
212 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
213 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
214 f->inocache->pino_nlink, inode->i_mapping->nrpages);
215
216 d_instantiate_new(dentry, inode);
217 return 0;
218
219 fail:
220 iget_failed(inode);
221 jffs2_free_raw_inode(ri);
222 return ret;
223 }
224
225 /***********************************************************************/
226
227
jffs2_unlink(struct inode * dir_i,struct dentry * dentry)228 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
229 {
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));
233 int ret;
234 uint32_t now = JFFS2_NOW();
235
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);
240 if (!ret)
241 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i, ITIME(now));
242 return ret;
243 }
244 /***********************************************************************/
245
246
jffs2_link(struct dentry * old_dentry,struct inode * dir_i,struct dentry * dentry)247 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
248 {
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);
252 int ret;
253 uint8_t type;
254 uint32_t now;
255
256 /* Don't let people make hard links to bad inodes. */
257 if (!f->inocache)
258 return -EIO;
259
260 if (d_is_dir(old_dentry))
261 return -EPERM;
262
263 /* XXX: This is ugly */
264 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
265 if (!type) type = DT_REG;
266
267 now = JFFS2_NOW();
268 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
269
270 if (!ret) {
271 mutex_lock(&f->sem);
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 = inode_set_ctime_to_ts(dir_i, ITIME(now));
276 ihold(d_inode(old_dentry));
277 }
278 return ret;
279 }
280
281 /***********************************************************************/
282
jffs2_symlink(struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,const char * target)283 static int jffs2_symlink (struct mnt_idmap *idmap, struct inode *dir_i,
284 struct dentry *dentry, const char *target)
285 {
286 struct jffs2_inode_info *f, *dir_f;
287 struct jffs2_sb_info *c;
288 struct inode *inode;
289 struct jffs2_raw_inode *ri;
290 struct jffs2_raw_dirent *rd;
291 struct jffs2_full_dnode *fn;
292 struct jffs2_full_dirent *fd;
293 int namelen;
294 uint32_t alloclen;
295 int ret, targetlen = strlen(target);
296
297 /* FIXME: If you care. We'd need to use frags for the target
298 if it grows much more than this */
299 if (targetlen > 254)
300 return -ENAMETOOLONG;
301
302 ri = jffs2_alloc_raw_inode();
303
304 if (!ri)
305 return -ENOMEM;
306
307 c = JFFS2_SB_INFO(dir_i->i_sb);
308
309 /* Try to reserve enough space for both node and dirent.
310 * Just the node will do for now, though
311 */
312 namelen = dentry->d_name.len;
313 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
314 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
315
316 if (ret) {
317 jffs2_free_raw_inode(ri);
318 return ret;
319 }
320
321 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
322
323 if (IS_ERR(inode)) {
324 jffs2_free_raw_inode(ri);
325 jffs2_complete_reservation(c);
326 return PTR_ERR(inode);
327 }
328
329 inode->i_op = &jffs2_symlink_inode_operations;
330
331 f = JFFS2_INODE_INFO(inode);
332
333 inode->i_size = targetlen;
334 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
335 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
336 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
337
338 ri->compr = JFFS2_COMPR_NONE;
339 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
340 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
341
342 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
343
344 jffs2_free_raw_inode(ri);
345
346 if (IS_ERR(fn)) {
347 /* Eeek. Wave bye bye */
348 mutex_unlock(&f->sem);
349 jffs2_complete_reservation(c);
350 ret = PTR_ERR(fn);
351 goto fail;
352 }
353
354 /* We use f->target field to store the target path. */
355 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
356 if (!f->target) {
357 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
358 mutex_unlock(&f->sem);
359 jffs2_complete_reservation(c);
360 ret = -ENOMEM;
361 goto fail;
362 }
363 inode->i_link = f->target;
364
365 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
366 __func__, (char *)f->target);
367
368 /* No data here. Only a metadata node, which will be
369 obsoleted by the first data write
370 */
371 f->metadata = fn;
372 mutex_unlock(&f->sem);
373
374 jffs2_complete_reservation(c);
375
376 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
377 if (ret)
378 goto fail;
379
380 ret = jffs2_init_acl_post(inode);
381 if (ret)
382 goto fail;
383
384 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
385 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
386 if (ret)
387 goto fail;
388
389 rd = jffs2_alloc_raw_dirent();
390 if (!rd) {
391 /* Argh. Now we treat it like a normal delete */
392 jffs2_complete_reservation(c);
393 ret = -ENOMEM;
394 goto fail;
395 }
396
397 dir_f = JFFS2_INODE_INFO(dir_i);
398 mutex_lock(&dir_f->sem);
399
400 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
401 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
402 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
403 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
404
405 rd->pino = cpu_to_je32(dir_i->i_ino);
406 rd->version = cpu_to_je32(++dir_f->highest_version);
407 rd->ino = cpu_to_je32(inode->i_ino);
408 rd->mctime = cpu_to_je32(JFFS2_NOW());
409 rd->nsize = namelen;
410 rd->type = DT_LNK;
411 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
412 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
413
414 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
415
416 if (IS_ERR(fd)) {
417 /* dirent failed to write. Delete the inode normally
418 as if it were the final unlink() */
419 jffs2_complete_reservation(c);
420 jffs2_free_raw_dirent(rd);
421 mutex_unlock(&dir_f->sem);
422 ret = PTR_ERR(fd);
423 goto fail;
424 }
425
426 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i,
427 ITIME(je32_to_cpu(rd->mctime)));
428
429 jffs2_free_raw_dirent(rd);
430
431 /* Link the fd into the inode's list, obsoleting an old
432 one if necessary. */
433 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
434
435 mutex_unlock(&dir_f->sem);
436 jffs2_complete_reservation(c);
437
438 d_instantiate_new(dentry, inode);
439 return 0;
440
441 fail:
442 iget_failed(inode);
443 return ret;
444 }
445
446
jffs2_mkdir(struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode)447 static int jffs2_mkdir (struct mnt_idmap *idmap, struct inode *dir_i,
448 struct dentry *dentry, umode_t mode)
449 {
450 struct jffs2_inode_info *f, *dir_f;
451 struct jffs2_sb_info *c;
452 struct inode *inode;
453 struct jffs2_raw_inode *ri;
454 struct jffs2_raw_dirent *rd;
455 struct jffs2_full_dnode *fn;
456 struct jffs2_full_dirent *fd;
457 int namelen;
458 uint32_t alloclen;
459 int ret;
460
461 mode |= S_IFDIR;
462
463 ri = jffs2_alloc_raw_inode();
464 if (!ri)
465 return -ENOMEM;
466
467 c = JFFS2_SB_INFO(dir_i->i_sb);
468
469 /* Try to reserve enough space for both node and dirent.
470 * Just the node will do for now, though
471 */
472 namelen = dentry->d_name.len;
473 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
474 JFFS2_SUMMARY_INODE_SIZE);
475
476 if (ret) {
477 jffs2_free_raw_inode(ri);
478 return ret;
479 }
480
481 inode = jffs2_new_inode(dir_i, mode, ri);
482
483 if (IS_ERR(inode)) {
484 jffs2_free_raw_inode(ri);
485 jffs2_complete_reservation(c);
486 return PTR_ERR(inode);
487 }
488
489 inode->i_op = &jffs2_dir_inode_operations;
490 inode->i_fop = &jffs2_dir_operations;
491
492 f = JFFS2_INODE_INFO(inode);
493
494 /* Directories get nlink 2 at start */
495 set_nlink(inode, 2);
496 /* but ic->pino_nlink is the parent ino# */
497 f->inocache->pino_nlink = dir_i->i_ino;
498
499 ri->data_crc = cpu_to_je32(0);
500 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
501
502 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
503
504 jffs2_free_raw_inode(ri);
505
506 if (IS_ERR(fn)) {
507 /* Eeek. Wave bye bye */
508 mutex_unlock(&f->sem);
509 jffs2_complete_reservation(c);
510 ret = PTR_ERR(fn);
511 goto fail;
512 }
513 /* No data here. Only a metadata node, which will be
514 obsoleted by the first data write
515 */
516 f->metadata = fn;
517 mutex_unlock(&f->sem);
518
519 jffs2_complete_reservation(c);
520
521 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
522 if (ret)
523 goto fail;
524
525 ret = jffs2_init_acl_post(inode);
526 if (ret)
527 goto fail;
528
529 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
530 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
531 if (ret)
532 goto fail;
533
534 rd = jffs2_alloc_raw_dirent();
535 if (!rd) {
536 /* Argh. Now we treat it like a normal delete */
537 jffs2_complete_reservation(c);
538 ret = -ENOMEM;
539 goto fail;
540 }
541
542 dir_f = JFFS2_INODE_INFO(dir_i);
543 mutex_lock(&dir_f->sem);
544
545 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
546 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
547 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
548 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
549
550 rd->pino = cpu_to_je32(dir_i->i_ino);
551 rd->version = cpu_to_je32(++dir_f->highest_version);
552 rd->ino = cpu_to_je32(inode->i_ino);
553 rd->mctime = cpu_to_je32(JFFS2_NOW());
554 rd->nsize = namelen;
555 rd->type = DT_DIR;
556 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
557 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
558
559 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
560
561 if (IS_ERR(fd)) {
562 /* dirent failed to write. Delete the inode normally
563 as if it were the final unlink() */
564 jffs2_complete_reservation(c);
565 jffs2_free_raw_dirent(rd);
566 mutex_unlock(&dir_f->sem);
567 ret = PTR_ERR(fd);
568 goto fail;
569 }
570
571 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i,
572 ITIME(je32_to_cpu(rd->mctime)));
573 inc_nlink(dir_i);
574
575 jffs2_free_raw_dirent(rd);
576
577 /* Link the fd into the inode's list, obsoleting an old
578 one if necessary. */
579 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
580
581 mutex_unlock(&dir_f->sem);
582 jffs2_complete_reservation(c);
583
584 d_instantiate_new(dentry, inode);
585 return 0;
586
587 fail:
588 iget_failed(inode);
589 return ret;
590 }
591
jffs2_rmdir(struct inode * dir_i,struct dentry * dentry)592 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
593 {
594 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
595 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
596 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
597 struct jffs2_full_dirent *fd;
598 int ret;
599 uint32_t now = JFFS2_NOW();
600
601 mutex_lock(&f->sem);
602 for (fd = f->dents ; fd; fd = fd->next) {
603 if (fd->ino) {
604 mutex_unlock(&f->sem);
605 return -ENOTEMPTY;
606 }
607 }
608 mutex_unlock(&f->sem);
609
610 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
611 dentry->d_name.len, f, now);
612 if (!ret) {
613 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i, ITIME(now));
614 clear_nlink(d_inode(dentry));
615 drop_nlink(dir_i);
616 }
617 return ret;
618 }
619
jffs2_mknod(struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode,dev_t rdev)620 static int jffs2_mknod (struct mnt_idmap *idmap, struct inode *dir_i,
621 struct dentry *dentry, umode_t mode, dev_t rdev)
622 {
623 struct jffs2_inode_info *f, *dir_f;
624 struct jffs2_sb_info *c;
625 struct inode *inode;
626 struct jffs2_raw_inode *ri;
627 struct jffs2_raw_dirent *rd;
628 struct jffs2_full_dnode *fn;
629 struct jffs2_full_dirent *fd;
630 int namelen;
631 union jffs2_device_node dev;
632 int devlen = 0;
633 uint32_t alloclen;
634 int ret;
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 ret = PTR_ERR(fn);
686 goto fail;
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, &dentry->d_name);
697 if (ret)
698 goto fail;
699
700 ret = jffs2_init_acl_post(inode);
701 if (ret)
702 goto fail;
703
704 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
705 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
706 if (ret)
707 goto fail;
708
709 rd = jffs2_alloc_raw_dirent();
710 if (!rd) {
711 /* Argh. Now we treat it like a normal delete */
712 jffs2_complete_reservation(c);
713 ret = -ENOMEM;
714 goto fail;
715 }
716
717 dir_f = JFFS2_INODE_INFO(dir_i);
718 mutex_lock(&dir_f->sem);
719
720 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
721 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
722 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
723 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
724
725 rd->pino = cpu_to_je32(dir_i->i_ino);
726 rd->version = cpu_to_je32(++dir_f->highest_version);
727 rd->ino = cpu_to_je32(inode->i_ino);
728 rd->mctime = cpu_to_je32(JFFS2_NOW());
729 rd->nsize = namelen;
730
731 /* XXX: This is ugly. */
732 rd->type = (mode & S_IFMT) >> 12;
733
734 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
735 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
736
737 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
738
739 if (IS_ERR(fd)) {
740 /* dirent failed to write. Delete the inode normally
741 as if it were the final unlink() */
742 jffs2_complete_reservation(c);
743 jffs2_free_raw_dirent(rd);
744 mutex_unlock(&dir_f->sem);
745 ret = PTR_ERR(fd);
746 goto fail;
747 }
748
749 dir_i->i_mtime = inode_set_ctime_to_ts(dir_i,
750 ITIME(je32_to_cpu(rd->mctime)));
751
752 jffs2_free_raw_dirent(rd);
753
754 /* Link the fd into the inode's list, obsoleting an old
755 one if necessary. */
756 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
757
758 mutex_unlock(&dir_f->sem);
759 jffs2_complete_reservation(c);
760
761 d_instantiate_new(dentry, inode);
762 return 0;
763
764 fail:
765 iget_failed(inode);
766 return ret;
767 }
768
jffs2_rename(struct mnt_idmap * idmap,struct inode * old_dir_i,struct dentry * old_dentry,struct inode * new_dir_i,struct dentry * new_dentry,unsigned int flags)769 static int jffs2_rename (struct mnt_idmap *idmap,
770 struct inode *old_dir_i, struct dentry *old_dentry,
771 struct inode *new_dir_i, struct dentry *new_dentry,
772 unsigned int flags)
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 if (flags & ~RENAME_NOREPLACE)
781 return -EINVAL;
782
783 /* The VFS will check for us and prevent trying to rename a
784 * file over a directory and vice versa, but if it's a directory,
785 * the VFS can't check whether the victim is empty. The filesystem
786 * needs to do that for itself.
787 */
788 if (d_really_is_positive(new_dentry)) {
789 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
790 if (d_is_dir(new_dentry)) {
791 struct jffs2_full_dirent *fd;
792
793 mutex_lock(&victim_f->sem);
794 for (fd = victim_f->dents; fd; fd = fd->next) {
795 if (fd->ino) {
796 mutex_unlock(&victim_f->sem);
797 return -ENOTEMPTY;
798 }
799 }
800 mutex_unlock(&victim_f->sem);
801 }
802 }
803
804 /* XXX: We probably ought to alloc enough space for
805 both nodes at the same time. Writing the new link,
806 then getting -ENOSPC, is quite bad :)
807 */
808
809 /* Make a hard link */
810
811 /* XXX: This is ugly */
812 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
813 if (!type) type = DT_REG;
814
815 now = JFFS2_NOW();
816 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
817 d_inode(old_dentry)->i_ino, type,
818 new_dentry->d_name.name, new_dentry->d_name.len, now);
819
820 if (ret)
821 return ret;
822
823 if (victim_f) {
824 /* There was a victim. Kill it off nicely */
825 if (d_is_dir(new_dentry))
826 clear_nlink(d_inode(new_dentry));
827 else
828 drop_nlink(d_inode(new_dentry));
829 /* Don't oops if the victim was a dirent pointing to an
830 inode which didn't exist. */
831 if (victim_f->inocache) {
832 mutex_lock(&victim_f->sem);
833 if (d_is_dir(new_dentry))
834 victim_f->inocache->pino_nlink = 0;
835 else
836 victim_f->inocache->pino_nlink--;
837 mutex_unlock(&victim_f->sem);
838 }
839 }
840
841 /* If it was a directory we moved, and there was no victim,
842 increase i_nlink on its new parent */
843 if (d_is_dir(old_dentry) && !victim_f)
844 inc_nlink(new_dir_i);
845
846 /* Unlink the original */
847 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
848 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
849
850 /* We don't touch inode->i_nlink */
851
852 if (ret) {
853 /* Oh shit. We really ought to make a single node which can do both atomically */
854 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
855 mutex_lock(&f->sem);
856 inc_nlink(d_inode(old_dentry));
857 if (f->inocache && !d_is_dir(old_dentry))
858 f->inocache->pino_nlink++;
859 mutex_unlock(&f->sem);
860
861 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
862 __func__, ret);
863 /*
864 * We can't keep the target in dcache after that.
865 * For one thing, we can't afford dentry aliases for directories.
866 * For another, if there was a victim, we _can't_ set new inode
867 * for that sucker and we have to trigger mount eviction - the
868 * caller won't do it on its own since we are returning an error.
869 */
870 d_invalidate(new_dentry);
871 new_dir_i->i_mtime = inode_set_ctime_to_ts(new_dir_i,
872 ITIME(now));
873 return ret;
874 }
875
876 if (d_is_dir(old_dentry))
877 drop_nlink(old_dir_i);
878
879 old_dir_i->i_mtime = inode_set_ctime_to_ts(old_dir_i, ITIME(now));
880 new_dir_i->i_mtime = inode_set_ctime_to_ts(new_dir_i, ITIME(now));
881
882 return 0;
883 }
884
885