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/filelock.h>
19 #include <linux/crc32.h>
20 #include <linux/jffs2.h>
21 #include "jffs2_fs_i.h"
22 #include "jffs2_fs_sb.h"
23 #include <linux/time.h>
24 #include "nodelist.h"
25
26 static int jffs2_readdir (struct file *, struct dir_context *);
27
28 static int jffs2_create (const struct mnt_idmap *, struct inode *,
29 struct dentry *, umode_t);
30 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
31 unsigned int);
32 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
33 static int jffs2_unlink (struct inode *,struct dentry *);
34 static int jffs2_symlink (const struct mnt_idmap *, struct inode *,
35 struct dentry *, const char *);
36 static struct dentry *jffs2_mkdir (const struct mnt_idmap *, struct inode *,struct dentry *,
37 umode_t);
38 static int jffs2_rmdir (struct inode *,struct dentry *);
39 static int jffs2_mknod (const struct mnt_idmap *, struct inode *,struct dentry *,
40 umode_t,dev_t);
41 static int jffs2_rename (const struct mnt_idmap *, struct inode *,
42 struct dentry *, struct inode *, struct dentry *,
43 unsigned int);
44
45 const struct file_operations jffs2_dir_operations =
46 {
47 .read = generic_read_dir,
48 .iterate_shared=jffs2_readdir,
49 .unlocked_ioctl=jffs2_ioctl,
50 .fsync = jffs2_fsync,
51 .llseek = generic_file_llseek,
52 .setlease = generic_setlease,
53 };
54
55
56 const struct inode_operations jffs2_dir_inode_operations =
57 {
58 .create = jffs2_create,
59 .lookup = jffs2_lookup,
60 .link = jffs2_link,
61 .unlink = jffs2_unlink,
62 .symlink = jffs2_symlink,
63 .mkdir = jffs2_mkdir,
64 .rmdir = jffs2_rmdir,
65 .mknod = jffs2_mknod,
66 .rename = jffs2_rename,
67 .get_inode_acl = jffs2_get_acl,
68 .set_acl = jffs2_set_acl,
69 .setattr = jffs2_setattr,
70 .listxattr = jffs2_listxattr,
71 };
72
73 /***********************************************************************/
74
75
76 /* We keep the dirent list sorted in increasing order of name hash,
77 and we use the same hash function as the dentries. Makes this
78 nice and simple
79 */
jffs2_lookup(struct inode * dir_i,struct dentry * target,unsigned int flags)80 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
81 unsigned int flags)
82 {
83 struct jffs2_inode_info *dir_f;
84 struct jffs2_full_dirent *fd = NULL, *fd_list;
85 uint32_t ino = 0;
86 struct inode *inode = NULL;
87 unsigned int nhash;
88
89 jffs2_dbg(1, "jffs2_lookup()\n");
90
91 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
92 return ERR_PTR(-ENAMETOOLONG);
93
94 dir_f = JFFS2_INODE_INFO(dir_i);
95
96 /* The 'nhash' on the fd_list is not the same as the dentry hash */
97 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
98
99 mutex_lock(&dir_f->sem);
100
101 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
102 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
103 if (fd_list->nhash == nhash &&
104 (!fd || fd_list->version > fd->version) &&
105 strlen(fd_list->name) == target->d_name.len &&
106 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
107 fd = fd_list;
108 }
109 }
110 if (fd)
111 ino = fd->ino;
112 mutex_unlock(&dir_f->sem);
113 if (ino) {
114 inode = jffs2_iget(dir_i->i_sb, ino);
115 if (IS_ERR(inode))
116 pr_warn("iget() failed for ino #%u\n", ino);
117 }
118
119 return d_splice_alias(inode, target);
120 }
121
122 /***********************************************************************/
123
124
jffs2_readdir(struct file * file,struct dir_context * ctx)125 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
126 {
127 struct inode *inode = file_inode(file);
128 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
129 struct jffs2_full_dirent *fd;
130 unsigned long curofs = 1;
131
132 jffs2_dbg(1, "jffs2_readdir() for dir_i #%llu\n", inode->i_ino);
133
134 if (!dir_emit_dots(file, ctx))
135 return 0;
136
137 mutex_lock(&f->sem);
138 for (fd = f->dents; fd; fd = fd->next) {
139 curofs++;
140 /* First loop: curofs = 2; pos = 2 */
141 if (curofs < ctx->pos) {
142 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
143 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
144 continue;
145 }
146 if (!fd->ino) {
147 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
148 fd->name);
149 ctx->pos++;
150 continue;
151 }
152 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
153 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
154 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
155 break;
156 ctx->pos++;
157 }
158 mutex_unlock(&f->sem);
159 return 0;
160 }
161
162 /***********************************************************************/
163
164
jffs2_create(const struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode)165 static int jffs2_create(const struct mnt_idmap *idmap, struct inode *dir_i,
166 struct dentry *dentry, umode_t mode)
167 {
168 struct jffs2_raw_inode *ri;
169 struct jffs2_inode_info *f, *dir_f;
170 struct jffs2_sb_info *c;
171 struct inode *inode;
172 int ret;
173
174 ri = jffs2_alloc_raw_inode();
175 if (!ri)
176 return -ENOMEM;
177
178 c = JFFS2_SB_INFO(dir_i->i_sb);
179
180 jffs2_dbg(1, "%s()\n", __func__);
181
182 inode = jffs2_new_inode(dir_i, mode, ri);
183
184 if (IS_ERR(inode)) {
185 jffs2_dbg(1, "jffs2_new_inode() failed\n");
186 jffs2_free_raw_inode(ri);
187 return PTR_ERR(inode);
188 }
189
190 inode->i_op = &jffs2_file_inode_operations;
191 inode->i_fop = &jffs2_file_operations;
192 inode->i_mapping->a_ops = &jffs2_file_address_operations;
193 inode->i_mapping->nrpages = 0;
194
195 f = JFFS2_INODE_INFO(inode);
196 dir_f = JFFS2_INODE_INFO(dir_i);
197
198 /* jffs2_do_create() will want to lock it, _after_ reserving
199 space and taking c-alloc_sem. If we keep it locked here,
200 lockdep gets unhappy (although it's a false positive;
201 nothing else will be looking at this inode yet so there's
202 no chance of AB-BA deadlock involving its f->sem). */
203 mutex_unlock(&f->sem);
204
205 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
206 if (ret)
207 goto fail;
208
209 inode_set_mtime_to_ts(dir_i,
210 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(ri->ctime))));
211
212 jffs2_free_raw_inode(ri);
213
214 jffs2_dbg(1, "%s(): Created ino #%llu with mode %o, nlink %d(%d). nrpages %ld\n",
215 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
216 f->inocache->pino_nlink, inode->i_mapping->nrpages);
217
218 d_instantiate_new(dentry, inode);
219 return 0;
220
221 fail:
222 iget_failed(inode);
223 jffs2_free_raw_inode(ri);
224 return ret;
225 }
226
227 /***********************************************************************/
228
229
jffs2_unlink(struct inode * dir_i,struct dentry * dentry)230 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
231 {
232 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
233 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
234 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
235 int ret;
236 uint32_t now = JFFS2_NOW();
237
238 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
239 dentry->d_name.len, dead_f, now);
240 if (dead_f->inocache)
241 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
242 if (!ret)
243 inode_set_mtime_to_ts(dir_i,
244 inode_set_ctime_to_ts(dir_i, ITIME(now)));
245 return ret;
246 }
247 /***********************************************************************/
248
249
jffs2_link(struct dentry * old_dentry,struct inode * dir_i,struct dentry * dentry)250 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
251 {
252 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
253 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
254 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
255 int ret;
256 uint8_t type;
257 uint32_t now;
258
259 /* Don't let people make hard links to bad inodes. */
260 if (!f->inocache)
261 return -EIO;
262
263 if (d_is_dir(old_dentry))
264 return -EPERM;
265
266 /* XXX: This is ugly */
267 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
268 if (!type) type = DT_REG;
269
270 now = JFFS2_NOW();
271 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
272
273 if (!ret) {
274 mutex_lock(&f->sem);
275 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
276 mutex_unlock(&f->sem);
277 d_instantiate(dentry, d_inode(old_dentry));
278 inode_set_mtime_to_ts(dir_i,
279 inode_set_ctime_to_ts(dir_i, ITIME(now)));
280 ihold(d_inode(old_dentry));
281 }
282 return ret;
283 }
284
285 /***********************************************************************/
286
jffs2_symlink(const struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,const char * target)287 static int jffs2_symlink (const struct mnt_idmap *idmap, struct inode *dir_i,
288 struct dentry *dentry, const char *target)
289 {
290 struct jffs2_inode_info *f, *dir_f;
291 struct jffs2_sb_info *c;
292 struct inode *inode;
293 struct jffs2_raw_inode *ri;
294 struct jffs2_raw_dirent *rd;
295 struct jffs2_full_dnode *fn;
296 struct jffs2_full_dirent *fd;
297 int namelen;
298 uint32_t alloclen;
299 int ret, targetlen = strlen(target);
300
301 /* FIXME: If you care. We'd need to use frags for the target
302 if it grows much more than this */
303 if (targetlen > 254)
304 return -ENAMETOOLONG;
305
306 ri = jffs2_alloc_raw_inode();
307
308 if (!ri)
309 return -ENOMEM;
310
311 c = JFFS2_SB_INFO(dir_i->i_sb);
312
313 /* Try to reserve enough space for both node and dirent.
314 * Just the node will do for now, though
315 */
316 namelen = dentry->d_name.len;
317 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
318 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
319
320 if (ret) {
321 jffs2_free_raw_inode(ri);
322 return ret;
323 }
324
325 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
326
327 if (IS_ERR(inode)) {
328 jffs2_free_raw_inode(ri);
329 jffs2_complete_reservation(c);
330 return PTR_ERR(inode);
331 }
332
333 inode->i_op = &jffs2_symlink_inode_operations;
334
335 f = JFFS2_INODE_INFO(inode);
336
337 inode->i_size = targetlen;
338 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
339 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
340 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
341
342 ri->compr = JFFS2_COMPR_NONE;
343 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
344 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
345
346 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
347
348 jffs2_free_raw_inode(ri);
349
350 if (IS_ERR(fn)) {
351 /* Eeek. Wave bye bye */
352 mutex_unlock(&f->sem);
353 jffs2_complete_reservation(c);
354 ret = PTR_ERR(fn);
355 goto fail;
356 }
357
358 /* We use f->target field to store the target path. */
359 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
360 if (!f->target) {
361 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
362 mutex_unlock(&f->sem);
363 jffs2_complete_reservation(c);
364 ret = -ENOMEM;
365 goto fail;
366 }
367 inode->i_link = f->target;
368
369 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
370 __func__, (char *)f->target);
371
372 /* No data here. Only a metadata node, which will be
373 obsoleted by the first data write
374 */
375 f->metadata = fn;
376 mutex_unlock(&f->sem);
377
378 jffs2_complete_reservation(c);
379
380 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
381 if (ret)
382 goto fail;
383
384 ret = jffs2_init_acl_post(inode);
385 if (ret)
386 goto fail;
387
388 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
389 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
390 if (ret)
391 goto fail;
392
393 rd = jffs2_alloc_raw_dirent();
394 if (!rd) {
395 /* Argh. Now we treat it like a normal delete */
396 jffs2_complete_reservation(c);
397 ret = -ENOMEM;
398 goto fail;
399 }
400
401 dir_f = JFFS2_INODE_INFO(dir_i);
402 mutex_lock(&dir_f->sem);
403
404 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
405 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
406 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
407 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
408
409 rd->pino = cpu_to_je32(dir_i->i_ino);
410 rd->version = cpu_to_je32(++dir_f->highest_version);
411 rd->ino = cpu_to_je32(inode->i_ino);
412 rd->mctime = cpu_to_je32(JFFS2_NOW());
413 rd->nsize = namelen;
414 rd->type = DT_LNK;
415 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
416 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
417
418 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
419
420 if (IS_ERR(fd)) {
421 /* dirent failed to write. Delete the inode normally
422 as if it were the final unlink() */
423 jffs2_complete_reservation(c);
424 jffs2_free_raw_dirent(rd);
425 mutex_unlock(&dir_f->sem);
426 ret = PTR_ERR(fd);
427 goto fail;
428 }
429
430 inode_set_mtime_to_ts(dir_i,
431 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime))));
432
433 jffs2_free_raw_dirent(rd);
434
435 /* Link the fd into the inode's list, obsoleting an old
436 one if necessary. */
437 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
438
439 mutex_unlock(&dir_f->sem);
440 jffs2_complete_reservation(c);
441
442 d_instantiate_new(dentry, inode);
443 return 0;
444
445 fail:
446 iget_failed(inode);
447 return ret;
448 }
449
450
jffs2_mkdir(const struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode)451 static struct dentry *jffs2_mkdir (const struct mnt_idmap *idmap, struct inode *dir_i,
452 struct dentry *dentry, umode_t mode)
453 {
454 struct jffs2_inode_info *f, *dir_f;
455 struct jffs2_sb_info *c;
456 struct inode *inode;
457 struct jffs2_raw_inode *ri;
458 struct jffs2_raw_dirent *rd;
459 struct jffs2_full_dnode *fn;
460 struct jffs2_full_dirent *fd;
461 int namelen;
462 uint32_t alloclen;
463 int ret;
464
465 ri = jffs2_alloc_raw_inode();
466 if (!ri)
467 return ERR_PTR(-ENOMEM);
468
469 c = JFFS2_SB_INFO(dir_i->i_sb);
470
471 /* Try to reserve enough space for both node and dirent.
472 * Just the node will do for now, though
473 */
474 namelen = dentry->d_name.len;
475 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
476 JFFS2_SUMMARY_INODE_SIZE);
477
478 if (ret) {
479 jffs2_free_raw_inode(ri);
480 return ERR_PTR(ret);
481 }
482
483 inode = jffs2_new_inode(dir_i, mode, ri);
484
485 if (IS_ERR(inode)) {
486 jffs2_free_raw_inode(ri);
487 jffs2_complete_reservation(c);
488 return ERR_CAST(inode);
489 }
490
491 inode->i_op = &jffs2_dir_inode_operations;
492 inode->i_fop = &jffs2_dir_operations;
493
494 f = JFFS2_INODE_INFO(inode);
495
496 /* Directories get nlink 2 at start */
497 set_nlink(inode, 2);
498 /* but ic->pino_nlink is the parent ino# */
499 f->inocache->pino_nlink = dir_i->i_ino;
500
501 ri->data_crc = cpu_to_je32(0);
502 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
503
504 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
505
506 jffs2_free_raw_inode(ri);
507
508 if (IS_ERR(fn)) {
509 /* Eeek. Wave bye bye */
510 mutex_unlock(&f->sem);
511 jffs2_complete_reservation(c);
512 ret = PTR_ERR(fn);
513 goto fail;
514 }
515 /* No data here. Only a metadata node, which will be
516 obsoleted by the first data write
517 */
518 f->metadata = fn;
519 mutex_unlock(&f->sem);
520
521 jffs2_complete_reservation(c);
522
523 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
524 if (ret)
525 goto fail;
526
527 ret = jffs2_init_acl_post(inode);
528 if (ret)
529 goto fail;
530
531 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
532 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
533 if (ret)
534 goto fail;
535
536 rd = jffs2_alloc_raw_dirent();
537 if (!rd) {
538 /* Argh. Now we treat it like a normal delete */
539 jffs2_complete_reservation(c);
540 ret = -ENOMEM;
541 goto fail;
542 }
543
544 dir_f = JFFS2_INODE_INFO(dir_i);
545 mutex_lock(&dir_f->sem);
546
547 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
548 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
549 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
550 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
551
552 rd->pino = cpu_to_je32(dir_i->i_ino);
553 rd->version = cpu_to_je32(++dir_f->highest_version);
554 rd->ino = cpu_to_je32(inode->i_ino);
555 rd->mctime = cpu_to_je32(JFFS2_NOW());
556 rd->nsize = namelen;
557 rd->type = DT_DIR;
558 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
559 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
560
561 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
562
563 if (IS_ERR(fd)) {
564 /* dirent failed to write. Delete the inode normally
565 as if it were the final unlink() */
566 jffs2_complete_reservation(c);
567 jffs2_free_raw_dirent(rd);
568 mutex_unlock(&dir_f->sem);
569 ret = PTR_ERR(fd);
570 goto fail;
571 }
572
573 inode_set_mtime_to_ts(dir_i,
574 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime))));
575 inc_nlink(dir_i);
576
577 jffs2_free_raw_dirent(rd);
578
579 /* Link the fd into the inode's list, obsoleting an old
580 one if necessary. */
581 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
582
583 mutex_unlock(&dir_f->sem);
584 jffs2_complete_reservation(c);
585
586 d_instantiate_new(dentry, inode);
587 return NULL;
588
589 fail:
590 iget_failed(inode);
591 return ERR_PTR(ret);
592 }
593
jffs2_rmdir(struct inode * dir_i,struct dentry * dentry)594 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
595 {
596 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
597 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
598 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
599 struct jffs2_full_dirent *fd;
600 int ret;
601 uint32_t now = JFFS2_NOW();
602
603 mutex_lock(&f->sem);
604 for (fd = f->dents ; fd; fd = fd->next) {
605 if (fd->ino) {
606 mutex_unlock(&f->sem);
607 return -ENOTEMPTY;
608 }
609 }
610 mutex_unlock(&f->sem);
611
612 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
613 dentry->d_name.len, f, now);
614 if (!ret) {
615 inode_set_mtime_to_ts(dir_i,
616 inode_set_ctime_to_ts(dir_i, ITIME(now)));
617 clear_nlink(d_inode(dentry));
618 drop_nlink(dir_i);
619 }
620 return ret;
621 }
622
jffs2_mknod(const struct mnt_idmap * idmap,struct inode * dir_i,struct dentry * dentry,umode_t mode,dev_t rdev)623 static int jffs2_mknod (const struct mnt_idmap *idmap, struct inode *dir_i,
624 struct dentry *dentry, umode_t mode, dev_t rdev)
625 {
626 struct jffs2_inode_info *f, *dir_f;
627 struct jffs2_sb_info *c;
628 struct inode *inode;
629 struct jffs2_raw_inode *ri;
630 struct jffs2_raw_dirent *rd;
631 struct jffs2_full_dnode *fn;
632 struct jffs2_full_dirent *fd;
633 int namelen;
634 union jffs2_device_node dev;
635 int devlen = 0;
636 uint32_t alloclen;
637 int ret;
638
639 ri = jffs2_alloc_raw_inode();
640 if (!ri)
641 return -ENOMEM;
642
643 c = JFFS2_SB_INFO(dir_i->i_sb);
644
645 if (S_ISBLK(mode) || S_ISCHR(mode))
646 devlen = jffs2_encode_dev(&dev, rdev);
647
648 /* Try to reserve enough space for both node and dirent.
649 * Just the node will do for now, though
650 */
651 namelen = dentry->d_name.len;
652 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
653 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
654
655 if (ret) {
656 jffs2_free_raw_inode(ri);
657 return ret;
658 }
659
660 inode = jffs2_new_inode(dir_i, mode, ri);
661
662 if (IS_ERR(inode)) {
663 jffs2_free_raw_inode(ri);
664 jffs2_complete_reservation(c);
665 return PTR_ERR(inode);
666 }
667 inode->i_op = &jffs2_file_inode_operations;
668 init_special_inode(inode, inode->i_mode, rdev);
669
670 f = JFFS2_INODE_INFO(inode);
671
672 ri->dsize = ri->csize = cpu_to_je32(devlen);
673 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
674 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
675
676 ri->compr = JFFS2_COMPR_NONE;
677 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
678 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
679
680 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
681
682 jffs2_free_raw_inode(ri);
683
684 if (IS_ERR(fn)) {
685 /* Eeek. Wave bye bye */
686 mutex_unlock(&f->sem);
687 jffs2_complete_reservation(c);
688 ret = PTR_ERR(fn);
689 goto fail;
690 }
691 /* No data here. Only a metadata node, which will be
692 obsoleted by the first data write
693 */
694 f->metadata = fn;
695 mutex_unlock(&f->sem);
696
697 jffs2_complete_reservation(c);
698
699 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
700 if (ret)
701 goto fail;
702
703 ret = jffs2_init_acl_post(inode);
704 if (ret)
705 goto fail;
706
707 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
708 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
709 if (ret)
710 goto fail;
711
712 rd = jffs2_alloc_raw_dirent();
713 if (!rd) {
714 /* Argh. Now we treat it like a normal delete */
715 jffs2_complete_reservation(c);
716 ret = -ENOMEM;
717 goto fail;
718 }
719
720 dir_f = JFFS2_INODE_INFO(dir_i);
721 mutex_lock(&dir_f->sem);
722
723 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
724 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
725 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
726 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
727
728 rd->pino = cpu_to_je32(dir_i->i_ino);
729 rd->version = cpu_to_je32(++dir_f->highest_version);
730 rd->ino = cpu_to_je32(inode->i_ino);
731 rd->mctime = cpu_to_je32(JFFS2_NOW());
732 rd->nsize = namelen;
733
734 /* XXX: This is ugly. */
735 rd->type = (mode & S_IFMT) >> 12;
736
737 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
738 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
739
740 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
741
742 if (IS_ERR(fd)) {
743 /* dirent failed to write. Delete the inode normally
744 as if it were the final unlink() */
745 jffs2_complete_reservation(c);
746 jffs2_free_raw_dirent(rd);
747 mutex_unlock(&dir_f->sem);
748 ret = PTR_ERR(fd);
749 goto fail;
750 }
751
752 inode_set_mtime_to_ts(dir_i,
753 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime))));
754
755 jffs2_free_raw_dirent(rd);
756
757 /* Link the fd into the inode's list, obsoleting an old
758 one if necessary. */
759 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
760
761 mutex_unlock(&dir_f->sem);
762 jffs2_complete_reservation(c);
763
764 d_instantiate_new(dentry, inode);
765 return 0;
766
767 fail:
768 iget_failed(inode);
769 return ret;
770 }
771
jffs2_rename(const 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)772 static int jffs2_rename (const struct mnt_idmap *idmap,
773 struct inode *old_dir_i, struct dentry *old_dentry,
774 struct inode *new_dir_i, struct dentry *new_dentry,
775 unsigned int flags)
776 {
777 int ret;
778 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
779 struct jffs2_inode_info *victim_f = NULL;
780 uint8_t type;
781 uint32_t now;
782
783 if (flags & ~RENAME_NOREPLACE)
784 return -EINVAL;
785
786 /* The VFS will check for us and prevent trying to rename a
787 * file over a directory and vice versa, but if it's a directory,
788 * the VFS can't check whether the victim is empty. The filesystem
789 * needs to do that for itself.
790 */
791 if (d_really_is_positive(new_dentry)) {
792 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
793 if (d_is_dir(new_dentry)) {
794 struct jffs2_full_dirent *fd;
795
796 mutex_lock(&victim_f->sem);
797 for (fd = victim_f->dents; fd; fd = fd->next) {
798 if (fd->ino) {
799 mutex_unlock(&victim_f->sem);
800 return -ENOTEMPTY;
801 }
802 }
803 mutex_unlock(&victim_f->sem);
804 }
805 }
806
807 /* XXX: We probably ought to alloc enough space for
808 both nodes at the same time. Writing the new link,
809 then getting -ENOSPC, is quite bad :)
810 */
811
812 /* Make a hard link */
813
814 /* XXX: This is ugly */
815 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
816 if (!type) type = DT_REG;
817
818 now = JFFS2_NOW();
819 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
820 d_inode(old_dentry)->i_ino, type,
821 new_dentry->d_name.name, new_dentry->d_name.len, now);
822
823 if (ret)
824 return ret;
825
826 if (victim_f) {
827 /* There was a victim. Kill it off nicely */
828 if (d_is_dir(new_dentry))
829 clear_nlink(d_inode(new_dentry));
830 else
831 drop_nlink(d_inode(new_dentry));
832 /* Don't oops if the victim was a dirent pointing to an
833 inode which didn't exist. */
834 if (victim_f->inocache) {
835 mutex_lock(&victim_f->sem);
836 if (d_is_dir(new_dentry))
837 victim_f->inocache->pino_nlink = 0;
838 else
839 victim_f->inocache->pino_nlink--;
840 mutex_unlock(&victim_f->sem);
841 }
842 }
843
844 /* If it was a directory we moved, and there was no victim,
845 increase i_nlink on its new parent */
846 if (d_is_dir(old_dentry) && !victim_f)
847 inc_nlink(new_dir_i);
848
849 /* Unlink the original */
850 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
851 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
852
853 /* We don't touch inode->i_nlink */
854
855 if (ret) {
856 /* Oh shit. We really ought to make a single node which can do both atomically */
857 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
858 mutex_lock(&f->sem);
859 inc_nlink(d_inode(old_dentry));
860 if (f->inocache && !d_is_dir(old_dentry))
861 f->inocache->pino_nlink++;
862 mutex_unlock(&f->sem);
863
864 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
865 __func__, ret);
866 /*
867 * We can't keep the target in dcache after that.
868 * For one thing, we can't afford dentry aliases for directories.
869 * For another, if there was a victim, we _can't_ set new inode
870 * for that sucker and we have to trigger mount eviction - the
871 * caller won't do it on its own since we are returning an error.
872 */
873 d_invalidate(new_dentry);
874 inode_set_mtime_to_ts(new_dir_i,
875 inode_set_ctime_to_ts(new_dir_i, ITIME(now)));
876 return ret;
877 }
878
879 if (d_is_dir(old_dentry))
880 drop_nlink(old_dir_i);
881
882 inode_set_mtime_to_ts(old_dir_i,
883 inode_set_ctime_to_ts(old_dir_i, ITIME(now)));
884 inode_set_mtime_to_ts(new_dir_i,
885 inode_set_ctime_to_ts(new_dir_i, ITIME(now)));
886
887 return 0;
888 }
889
890