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 unsigned int);
40
41 const struct file_operations jffs2_dir_operations =
42 {
43 .read = generic_read_dir,
44 .iterate_shared=jffs2_readdir,
45 .unlocked_ioctl=jffs2_ioctl,
46 .fsync = jffs2_fsync,
47 .llseek = generic_file_llseek,
48 };
49
50
51 const struct inode_operations jffs2_dir_inode_operations =
52 {
53 .create = jffs2_create,
54 .lookup = jffs2_lookup,
55 .link = jffs2_link,
56 .unlink = jffs2_unlink,
57 .symlink = jffs2_symlink,
58 .mkdir = jffs2_mkdir,
59 .rmdir = jffs2_rmdir,
60 .mknod = jffs2_mknod,
61 .rename = jffs2_rename,
62 .get_acl = jffs2_get_acl,
63 .set_acl = jffs2_set_acl,
64 .setattr = jffs2_setattr,
65 .listxattr = jffs2_listxattr,
66 };
67
68 /***********************************************************************/
69
70
71 /* We keep the dirent list sorted in increasing order of name hash,
72 and we use the same hash function as the dentries. Makes this
73 nice and simple
74 */
jffs2_lookup(struct inode * dir_i,struct dentry * target,unsigned int flags)75 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
76 unsigned int flags)
77 {
78 struct jffs2_inode_info *dir_f;
79 struct jffs2_full_dirent *fd = NULL, *fd_list;
80 uint32_t ino = 0;
81 struct inode *inode = NULL;
82 unsigned int nhash;
83
84 jffs2_dbg(1, "jffs2_lookup()\n");
85
86 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
87 return ERR_PTR(-ENAMETOOLONG);
88
89 dir_f = JFFS2_INODE_INFO(dir_i);
90
91 /* The 'nhash' on the fd_list is not the same as the dentry hash */
92 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
93
94 mutex_lock(&dir_f->sem);
95
96 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
97 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
98 if (fd_list->nhash == nhash &&
99 (!fd || fd_list->version > fd->version) &&
100 strlen(fd_list->name) == target->d_name.len &&
101 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
102 fd = fd_list;
103 }
104 }
105 if (fd)
106 ino = fd->ino;
107 mutex_unlock(&dir_f->sem);
108 if (ino) {
109 inode = jffs2_iget(dir_i->i_sb, ino);
110 if (IS_ERR(inode))
111 pr_warn("iget() failed for ino #%u\n", ino);
112 }
113
114 return d_splice_alias(inode, target);
115 }
116
117 /***********************************************************************/
118
119
jffs2_readdir(struct file * file,struct dir_context * ctx)120 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
121 {
122 struct inode *inode = file_inode(file);
123 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
124 struct jffs2_full_dirent *fd;
125 unsigned long curofs = 1;
126
127 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
128
129 if (!dir_emit_dots(file, ctx))
130 return 0;
131
132 mutex_lock(&f->sem);
133 for (fd = f->dents; fd; fd = fd->next) {
134 curofs++;
135 /* First loop: curofs = 2; pos = 2 */
136 if (curofs < ctx->pos) {
137 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
138 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
139 continue;
140 }
141 if (!fd->ino) {
142 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
143 fd->name);
144 ctx->pos++;
145 continue;
146 }
147 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
148 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
149 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
150 break;
151 ctx->pos++;
152 }
153 mutex_unlock(&f->sem);
154 return 0;
155 }
156
157 /***********************************************************************/
158
159
jffs2_create(struct inode * dir_i,struct dentry * dentry,umode_t mode,bool excl)160 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
161 umode_t mode, bool excl)
162 {
163 struct jffs2_raw_inode *ri;
164 struct jffs2_inode_info *f, *dir_f;
165 struct jffs2_sb_info *c;
166 struct inode *inode;
167 int ret;
168
169 ri = jffs2_alloc_raw_inode();
170 if (!ri)
171 return -ENOMEM;
172
173 c = JFFS2_SB_INFO(dir_i->i_sb);
174
175 jffs2_dbg(1, "%s()\n", __func__);
176
177 inode = jffs2_new_inode(dir_i, mode, ri);
178
179 if (IS_ERR(inode)) {
180 jffs2_dbg(1, "jffs2_new_inode() failed\n");
181 jffs2_free_raw_inode(ri);
182 return PTR_ERR(inode);
183 }
184
185 inode->i_op = &jffs2_file_inode_operations;
186 inode->i_fop = &jffs2_file_operations;
187 inode->i_mapping->a_ops = &jffs2_file_address_operations;
188 inode->i_mapping->nrpages = 0;
189
190 f = JFFS2_INODE_INFO(inode);
191 dir_f = JFFS2_INODE_INFO(dir_i);
192
193 /* jffs2_do_create() will want to lock it, _after_ reserving
194 space and taking c-alloc_sem. If we keep it locked here,
195 lockdep gets unhappy (although it's a false positive;
196 nothing else will be looking at this inode yet so there's
197 no chance of AB-BA deadlock involving its f->sem). */
198 mutex_unlock(&f->sem);
199
200 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
201 if (ret)
202 goto fail;
203
204 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
205
206 jffs2_free_raw_inode(ri);
207
208 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
209 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
210 f->inocache->pino_nlink, inode->i_mapping->nrpages);
211
212 d_instantiate_new(dentry, inode);
213 return 0;
214
215 fail:
216 iget_failed(inode);
217 jffs2_free_raw_inode(ri);
218 return ret;
219 }
220
221 /***********************************************************************/
222
223
jffs2_unlink(struct inode * dir_i,struct dentry * dentry)224 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
225 {
226 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
227 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
228 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
229 int ret;
230 uint32_t now = JFFS2_NOW();
231
232 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
233 dentry->d_name.len, dead_f, now);
234 if (dead_f->inocache)
235 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
236 if (!ret)
237 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
238 return ret;
239 }
240 /***********************************************************************/
241
242
jffs2_link(struct dentry * old_dentry,struct inode * dir_i,struct dentry * dentry)243 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
244 {
245 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
246 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
247 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
248 int ret;
249 uint8_t type;
250 uint32_t now;
251
252 /* Don't let people make hard links to bad inodes. */
253 if (!f->inocache)
254 return -EIO;
255
256 if (d_is_dir(old_dentry))
257 return -EPERM;
258
259 /* XXX: This is ugly */
260 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
261 if (!type) type = DT_REG;
262
263 now = JFFS2_NOW();
264 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
265
266 if (!ret) {
267 mutex_lock(&f->sem);
268 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
269 mutex_unlock(&f->sem);
270 d_instantiate(dentry, d_inode(old_dentry));
271 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
272 ihold(d_inode(old_dentry));
273 }
274 return ret;
275 }
276
277 /***********************************************************************/
278
jffs2_symlink(struct inode * dir_i,struct dentry * dentry,const char * target)279 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
280 {
281 struct jffs2_inode_info *f, *dir_f;
282 struct jffs2_sb_info *c;
283 struct inode *inode;
284 struct jffs2_raw_inode *ri;
285 struct jffs2_raw_dirent *rd;
286 struct jffs2_full_dnode *fn;
287 struct jffs2_full_dirent *fd;
288 int namelen;
289 uint32_t alloclen;
290 int ret, targetlen = strlen(target);
291
292 /* FIXME: If you care. We'd need to use frags for the target
293 if it grows much more than this */
294 if (targetlen > 254)
295 return -ENAMETOOLONG;
296
297 ri = jffs2_alloc_raw_inode();
298
299 if (!ri)
300 return -ENOMEM;
301
302 c = JFFS2_SB_INFO(dir_i->i_sb);
303
304 /* Try to reserve enough space for both node and dirent.
305 * Just the node will do for now, though
306 */
307 namelen = dentry->d_name.len;
308 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
309 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
310
311 if (ret) {
312 jffs2_free_raw_inode(ri);
313 return ret;
314 }
315
316 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
317
318 if (IS_ERR(inode)) {
319 jffs2_free_raw_inode(ri);
320 jffs2_complete_reservation(c);
321 return PTR_ERR(inode);
322 }
323
324 inode->i_op = &jffs2_symlink_inode_operations;
325
326 f = JFFS2_INODE_INFO(inode);
327
328 inode->i_size = targetlen;
329 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
330 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
331 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
332
333 ri->compr = JFFS2_COMPR_NONE;
334 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
335 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
336
337 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
338
339 jffs2_free_raw_inode(ri);
340
341 if (IS_ERR(fn)) {
342 /* Eeek. Wave bye bye */
343 mutex_unlock(&f->sem);
344 jffs2_complete_reservation(c);
345 ret = PTR_ERR(fn);
346 goto fail;
347 }
348
349 /* We use f->target field to store the target path. */
350 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
351 if (!f->target) {
352 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
353 mutex_unlock(&f->sem);
354 jffs2_complete_reservation(c);
355 ret = -ENOMEM;
356 goto fail;
357 }
358 inode->i_link = f->target;
359
360 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
361 __func__, (char *)f->target);
362
363 /* No data here. Only a metadata node, which will be
364 obsoleted by the first data write
365 */
366 f->metadata = fn;
367 mutex_unlock(&f->sem);
368
369 jffs2_complete_reservation(c);
370
371 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
372 if (ret)
373 goto fail;
374
375 ret = jffs2_init_acl_post(inode);
376 if (ret)
377 goto fail;
378
379 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
380 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
381 if (ret)
382 goto fail;
383
384 rd = jffs2_alloc_raw_dirent();
385 if (!rd) {
386 /* Argh. Now we treat it like a normal delete */
387 jffs2_complete_reservation(c);
388 ret = -ENOMEM;
389 goto fail;
390 }
391
392 dir_f = JFFS2_INODE_INFO(dir_i);
393 mutex_lock(&dir_f->sem);
394
395 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
396 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
397 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
398 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
399
400 rd->pino = cpu_to_je32(dir_i->i_ino);
401 rd->version = cpu_to_je32(++dir_f->highest_version);
402 rd->ino = cpu_to_je32(inode->i_ino);
403 rd->mctime = cpu_to_je32(JFFS2_NOW());
404 rd->nsize = namelen;
405 rd->type = DT_LNK;
406 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
407 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
408
409 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
410
411 if (IS_ERR(fd)) {
412 /* dirent failed to write. Delete the inode normally
413 as if it were the final unlink() */
414 jffs2_complete_reservation(c);
415 jffs2_free_raw_dirent(rd);
416 mutex_unlock(&dir_f->sem);
417 ret = PTR_ERR(fd);
418 goto fail;
419 }
420
421 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
422
423 jffs2_free_raw_dirent(rd);
424
425 /* Link the fd into the inode's list, obsoleting an old
426 one if necessary. */
427 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
428
429 mutex_unlock(&dir_f->sem);
430 jffs2_complete_reservation(c);
431
432 d_instantiate_new(dentry, inode);
433 return 0;
434
435 fail:
436 iget_failed(inode);
437 return ret;
438 }
439
440
jffs2_mkdir(struct inode * dir_i,struct dentry * dentry,umode_t mode)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(JFFS2_NOW());
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 d_instantiate_new(dentry, inode);
577 return 0;
578
579 fail:
580 iget_failed(inode);
581 return ret;
582 }
583
jffs2_rmdir(struct inode * dir_i,struct dentry * dentry)584 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
585 {
586 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
587 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
588 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
589 struct jffs2_full_dirent *fd;
590 int ret;
591 uint32_t now = JFFS2_NOW();
592
593 for (fd = f->dents ; fd; fd = fd->next) {
594 if (fd->ino)
595 return -ENOTEMPTY;
596 }
597
598 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
599 dentry->d_name.len, f, now);
600 if (!ret) {
601 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
602 clear_nlink(d_inode(dentry));
603 drop_nlink(dir_i);
604 }
605 return ret;
606 }
607
jffs2_mknod(struct inode * dir_i,struct dentry * dentry,umode_t mode,dev_t rdev)608 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
609 {
610 struct jffs2_inode_info *f, *dir_f;
611 struct jffs2_sb_info *c;
612 struct inode *inode;
613 struct jffs2_raw_inode *ri;
614 struct jffs2_raw_dirent *rd;
615 struct jffs2_full_dnode *fn;
616 struct jffs2_full_dirent *fd;
617 int namelen;
618 union jffs2_device_node dev;
619 int devlen = 0;
620 uint32_t alloclen;
621 int ret;
622
623 ri = jffs2_alloc_raw_inode();
624 if (!ri)
625 return -ENOMEM;
626
627 c = JFFS2_SB_INFO(dir_i->i_sb);
628
629 if (S_ISBLK(mode) || S_ISCHR(mode))
630 devlen = jffs2_encode_dev(&dev, rdev);
631
632 /* Try to reserve enough space for both node and dirent.
633 * Just the node will do for now, though
634 */
635 namelen = dentry->d_name.len;
636 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
637 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
638
639 if (ret) {
640 jffs2_free_raw_inode(ri);
641 return ret;
642 }
643
644 inode = jffs2_new_inode(dir_i, mode, ri);
645
646 if (IS_ERR(inode)) {
647 jffs2_free_raw_inode(ri);
648 jffs2_complete_reservation(c);
649 return PTR_ERR(inode);
650 }
651 inode->i_op = &jffs2_file_inode_operations;
652 init_special_inode(inode, inode->i_mode, rdev);
653
654 f = JFFS2_INODE_INFO(inode);
655
656 ri->dsize = ri->csize = cpu_to_je32(devlen);
657 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
658 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
659
660 ri->compr = JFFS2_COMPR_NONE;
661 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
662 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
663
664 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
665
666 jffs2_free_raw_inode(ri);
667
668 if (IS_ERR(fn)) {
669 /* Eeek. Wave bye bye */
670 mutex_unlock(&f->sem);
671 jffs2_complete_reservation(c);
672 ret = PTR_ERR(fn);
673 goto fail;
674 }
675 /* No data here. Only a metadata node, which will be
676 obsoleted by the first data write
677 */
678 f->metadata = fn;
679 mutex_unlock(&f->sem);
680
681 jffs2_complete_reservation(c);
682
683 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
684 if (ret)
685 goto fail;
686
687 ret = jffs2_init_acl_post(inode);
688 if (ret)
689 goto fail;
690
691 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
692 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
693 if (ret)
694 goto fail;
695
696 rd = jffs2_alloc_raw_dirent();
697 if (!rd) {
698 /* Argh. Now we treat it like a normal delete */
699 jffs2_complete_reservation(c);
700 ret = -ENOMEM;
701 goto fail;
702 }
703
704 dir_f = JFFS2_INODE_INFO(dir_i);
705 mutex_lock(&dir_f->sem);
706
707 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
708 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
709 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
710 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
711
712 rd->pino = cpu_to_je32(dir_i->i_ino);
713 rd->version = cpu_to_je32(++dir_f->highest_version);
714 rd->ino = cpu_to_je32(inode->i_ino);
715 rd->mctime = cpu_to_je32(JFFS2_NOW());
716 rd->nsize = namelen;
717
718 /* XXX: This is ugly. */
719 rd->type = (mode & S_IFMT) >> 12;
720
721 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
722 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
723
724 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
725
726 if (IS_ERR(fd)) {
727 /* dirent failed to write. Delete the inode normally
728 as if it were the final unlink() */
729 jffs2_complete_reservation(c);
730 jffs2_free_raw_dirent(rd);
731 mutex_unlock(&dir_f->sem);
732 ret = PTR_ERR(fd);
733 goto fail;
734 }
735
736 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
737
738 jffs2_free_raw_dirent(rd);
739
740 /* Link the fd into the inode's list, obsoleting an old
741 one if necessary. */
742 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
743
744 mutex_unlock(&dir_f->sem);
745 jffs2_complete_reservation(c);
746
747 d_instantiate_new(dentry, inode);
748 return 0;
749
750 fail:
751 iget_failed(inode);
752 return ret;
753 }
754
jffs2_rename(struct inode * old_dir_i,struct dentry * old_dentry,struct inode * new_dir_i,struct dentry * new_dentry,unsigned int flags)755 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
756 struct inode *new_dir_i, struct dentry *new_dentry,
757 unsigned int flags)
758 {
759 int ret;
760 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
761 struct jffs2_inode_info *victim_f = NULL;
762 uint8_t type;
763 uint32_t now;
764
765 if (flags & ~RENAME_NOREPLACE)
766 return -EINVAL;
767
768 /* The VFS will check for us and prevent trying to rename a
769 * file over a directory and vice versa, but if it's a directory,
770 * the VFS can't check whether the victim is empty. The filesystem
771 * needs to do that for itself.
772 */
773 if (d_really_is_positive(new_dentry)) {
774 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
775 if (d_is_dir(new_dentry)) {
776 struct jffs2_full_dirent *fd;
777
778 mutex_lock(&victim_f->sem);
779 for (fd = victim_f->dents; fd; fd = fd->next) {
780 if (fd->ino) {
781 mutex_unlock(&victim_f->sem);
782 return -ENOTEMPTY;
783 }
784 }
785 mutex_unlock(&victim_f->sem);
786 }
787 }
788
789 /* XXX: We probably ought to alloc enough space for
790 both nodes at the same time. Writing the new link,
791 then getting -ENOSPC, is quite bad :)
792 */
793
794 /* Make a hard link */
795
796 /* XXX: This is ugly */
797 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
798 if (!type) type = DT_REG;
799
800 now = JFFS2_NOW();
801 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
802 d_inode(old_dentry)->i_ino, type,
803 new_dentry->d_name.name, new_dentry->d_name.len, now);
804
805 if (ret)
806 return ret;
807
808 if (victim_f) {
809 /* There was a victim. Kill it off nicely */
810 if (d_is_dir(new_dentry))
811 clear_nlink(d_inode(new_dentry));
812 else
813 drop_nlink(d_inode(new_dentry));
814 /* Don't oops if the victim was a dirent pointing to an
815 inode which didn't exist. */
816 if (victim_f->inocache) {
817 mutex_lock(&victim_f->sem);
818 if (d_is_dir(new_dentry))
819 victim_f->inocache->pino_nlink = 0;
820 else
821 victim_f->inocache->pino_nlink--;
822 mutex_unlock(&victim_f->sem);
823 }
824 }
825
826 /* If it was a directory we moved, and there was no victim,
827 increase i_nlink on its new parent */
828 if (d_is_dir(old_dentry) && !victim_f)
829 inc_nlink(new_dir_i);
830
831 /* Unlink the original */
832 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
833 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
834
835 /* We don't touch inode->i_nlink */
836
837 if (ret) {
838 /* Oh shit. We really ought to make a single node which can do both atomically */
839 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
840 mutex_lock(&f->sem);
841 inc_nlink(d_inode(old_dentry));
842 if (f->inocache && !d_is_dir(old_dentry))
843 f->inocache->pino_nlink++;
844 mutex_unlock(&f->sem);
845
846 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
847 __func__, ret);
848 /*
849 * We can't keep the target in dcache after that.
850 * For one thing, we can't afford dentry aliases for directories.
851 * For another, if there was a victim, we _can't_ set new inode
852 * for that sucker and we have to trigger mount eviction - the
853 * caller won't do it on its own since we are returning an error.
854 */
855 d_invalidate(new_dentry);
856 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
857 return ret;
858 }
859
860 if (d_is_dir(old_dentry))
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
868