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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
25static int jffs2_readdir (struct file *, struct dir_context *);
26
27static int jffs2_create (struct inode *,struct dentry *,umode_t,
28 bool);
29static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 unsigned int);
31static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32static int jffs2_unlink (struct inode *,struct dentry *);
33static int jffs2_symlink (struct inode *,struct dentry *,const char *);
34static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
35static int jffs2_rmdir (struct inode *,struct dentry *);
36static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
37static int jffs2_rename (struct inode *, struct dentry *,
38 struct inode *, struct dentry *);
39
40const 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
50const 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*/
77static 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
118static 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
158static 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
223static 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
242static 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
278static 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
441static 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
585static 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
609static 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 ri = jffs2_alloc_raw_inode();
625 if (!ri)
626 return -ENOMEM;
627
628 c = JFFS2_SB_INFO(dir_i->i_sb);
629
630 if (S_ISBLK(mode) || S_ISCHR(mode))
631 devlen = jffs2_encode_dev(&dev, rdev);
632
633 /* Try to reserve enough space for both node and dirent.
634 * Just the node will do for now, though
635 */
636 namelen = dentry->d_name.len;
637 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
638 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
639
640 if (ret) {
641 jffs2_free_raw_inode(ri);
642 return ret;
643 }
644
645 inode = jffs2_new_inode(dir_i, mode, ri);
646
647 if (IS_ERR(inode)) {
648 jffs2_free_raw_inode(ri);
649 jffs2_complete_reservation(c);
650 return PTR_ERR(inode);
651 }
652 inode->i_op = &jffs2_file_inode_operations;
653 init_special_inode(inode, inode->i_mode, rdev);
654
655 f = JFFS2_INODE_INFO(inode);
656
657 ri->dsize = ri->csize = cpu_to_je32(devlen);
658 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
659 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
660
661 ri->compr = JFFS2_COMPR_NONE;
662 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
663 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
664
665 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
666
667 jffs2_free_raw_inode(ri);
668
669 if (IS_ERR(fn)) {
670 /* Eeek. Wave bye bye */
671 mutex_unlock(&f->sem);
672 jffs2_complete_reservation(c);
673 ret = PTR_ERR(fn);
674 goto fail;
675 }
676 /* No data here. Only a metadata node, which will be
677 obsoleted by the first data write
678 */
679 f->metadata = fn;
680 mutex_unlock(&f->sem);
681
682 jffs2_complete_reservation(c);
683
684 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
685 if (ret)
686 goto fail;
687
688 ret = jffs2_init_acl_post(inode);
689 if (ret)
690 goto fail;
691
692 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
693 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
694 if (ret)
695 goto fail;
696
697 rd = jffs2_alloc_raw_dirent();
698 if (!rd) {
699 /* Argh. Now we treat it like a normal delete */
700 jffs2_complete_reservation(c);
701 ret = -ENOMEM;
702 goto fail;
703 }
704
705 dir_f = JFFS2_INODE_INFO(dir_i);
706 mutex_lock(&dir_f->sem);
707
708 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
709 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
710 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
711 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
712
713 rd->pino = cpu_to_je32(dir_i->i_ino);
714 rd->version = cpu_to_je32(++dir_f->highest_version);
715 rd->ino = cpu_to_je32(inode->i_ino);
716 rd->mctime = cpu_to_je32(get_seconds());
717 rd->nsize = namelen;
718
719 /* XXX: This is ugly. */
720 rd->type = (mode & S_IFMT) >> 12;
721
722 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
723 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
724
725 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
726
727 if (IS_ERR(fd)) {
728 /* dirent failed to write. Delete the inode normally
729 as if it were the final unlink() */
730 jffs2_complete_reservation(c);
731 jffs2_free_raw_dirent(rd);
732 mutex_unlock(&dir_f->sem);
733 ret = PTR_ERR(fd);
734 goto fail;
735 }
736
737 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
738
739 jffs2_free_raw_dirent(rd);
740
741 /* Link the fd into the inode's list, obsoleting an old
742 one if necessary. */
743 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
744
745 mutex_unlock(&dir_f->sem);
746 jffs2_complete_reservation(c);
747
748 unlock_new_inode(inode);
749 d_instantiate(dentry, inode);
750 return 0;
751
752 fail:
753 iget_failed(inode);
754 return ret;
755}
756
757static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
758 struct inode *new_dir_i, struct dentry *new_dentry)
759{
760 int ret;
761 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
762 struct jffs2_inode_info *victim_f = NULL;
763 uint8_t type;
764 uint32_t now;
765
766 /* The VFS will check for us and prevent trying to rename a
767 * file over a directory and vice versa, but if it's a directory,
768 * the VFS can't check whether the victim is empty. The filesystem
769 * needs to do that for itself.
770 */
771 if (d_really_is_positive(new_dentry)) {
772 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
773 if (d_is_dir(new_dentry)) {
774 struct jffs2_full_dirent *fd;
775
776 mutex_lock(&victim_f->sem);
777 for (fd = victim_f->dents; fd; fd = fd->next) {
778 if (fd->ino) {
779 mutex_unlock(&victim_f->sem);
780 return -ENOTEMPTY;
781 }
782 }
783 mutex_unlock(&victim_f->sem);
784 }
785 }
786
787 /* XXX: We probably ought to alloc enough space for
788 both nodes at the same time. Writing the new link,
789 then getting -ENOSPC, is quite bad :)
790 */
791
792 /* Make a hard link */
793
794 /* XXX: This is ugly */
795 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
796 if (!type) type = DT_REG;
797
798 now = get_seconds();
799 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
800 d_inode(old_dentry)->i_ino, type,
801 new_dentry->d_name.name, new_dentry->d_name.len, now);
802
803 if (ret)
804 return ret;
805
806 if (victim_f) {
807 /* There was a victim. Kill it off nicely */
808 if (d_is_dir(new_dentry))
809 clear_nlink(d_inode(new_dentry));
810 else
811 drop_nlink(d_inode(new_dentry));
812 /* Don't oops if the victim was a dirent pointing to an
813 inode which didn't exist. */
814 if (victim_f->inocache) {
815 mutex_lock(&victim_f->sem);
816 if (d_is_dir(new_dentry))
817 victim_f->inocache->pino_nlink = 0;
818 else
819 victim_f->inocache->pino_nlink--;
820 mutex_unlock(&victim_f->sem);
821 }
822 }
823
824 /* If it was a directory we moved, and there was no victim,
825 increase i_nlink on its new parent */
826 if (d_is_dir(old_dentry) && !victim_f)
827 inc_nlink(new_dir_i);
828
829 /* Unlink the original */
830 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
831 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
832
833 /* We don't touch inode->i_nlink */
834
835 if (ret) {
836 /* Oh shit. We really ought to make a single node which can do both atomically */
837 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
838 mutex_lock(&f->sem);
839 inc_nlink(d_inode(old_dentry));
840 if (f->inocache && !d_is_dir(old_dentry))
841 f->inocache->pino_nlink++;
842 mutex_unlock(&f->sem);
843
844 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
845 __func__, ret);
846 /*
847 * We can't keep the target in dcache after that.
848 * For one thing, we can't afford dentry aliases for directories.
849 * For another, if there was a victim, we _can't_ set new inode
850 * for that sucker and we have to trigger mount eviction - the
851 * caller won't do it on its own since we are returning an error.
852 */
853 d_invalidate(new_dentry);
854 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
855 return ret;
856 }
857
858 if (d_is_dir(old_dentry))
859 drop_nlink(old_dir_i);
860
861 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
862
863 return 0;
864}
865
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
25static int jffs2_readdir (struct file *, struct dir_context *);
26
27static int jffs2_create (struct mnt_idmap *, struct inode *,
28 struct dentry *, umode_t, bool);
29static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 unsigned int);
31static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32static int jffs2_unlink (struct inode *,struct dentry *);
33static int jffs2_symlink (struct mnt_idmap *, struct inode *,
34 struct dentry *, const char *);
35static int jffs2_mkdir (struct mnt_idmap *, struct inode *,struct dentry *,
36 umode_t);
37static int jffs2_rmdir (struct inode *,struct dentry *);
38static int jffs2_mknod (struct mnt_idmap *, struct inode *,struct dentry *,
39 umode_t,dev_t);
40static int jffs2_rename (struct mnt_idmap *, struct inode *,
41 struct dentry *, struct inode *, struct dentry *,
42 unsigned int);
43
44const 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
54const 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*/
78static 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
123static 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
163static 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 inode_set_mtime_to_ts(dir_i,
208 inode_set_ctime_to_ts(dir_i, 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
228static 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 inode_set_mtime_to_ts(dir_i,
242 inode_set_ctime_to_ts(dir_i, ITIME(now)));
243 return ret;
244}
245/***********************************************************************/
246
247
248static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
249{
250 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
251 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
252 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
253 int ret;
254 uint8_t type;
255 uint32_t now;
256
257 /* Don't let people make hard links to bad inodes. */
258 if (!f->inocache)
259 return -EIO;
260
261 if (d_is_dir(old_dentry))
262 return -EPERM;
263
264 /* XXX: This is ugly */
265 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
266 if (!type) type = DT_REG;
267
268 now = JFFS2_NOW();
269 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
270
271 if (!ret) {
272 mutex_lock(&f->sem);
273 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
274 mutex_unlock(&f->sem);
275 d_instantiate(dentry, d_inode(old_dentry));
276 inode_set_mtime_to_ts(dir_i,
277 inode_set_ctime_to_ts(dir_i, ITIME(now)));
278 ihold(d_inode(old_dentry));
279 }
280 return ret;
281}
282
283/***********************************************************************/
284
285static int jffs2_symlink (struct mnt_idmap *idmap, struct inode *dir_i,
286 struct dentry *dentry, const char *target)
287{
288 struct jffs2_inode_info *f, *dir_f;
289 struct jffs2_sb_info *c;
290 struct inode *inode;
291 struct jffs2_raw_inode *ri;
292 struct jffs2_raw_dirent *rd;
293 struct jffs2_full_dnode *fn;
294 struct jffs2_full_dirent *fd;
295 int namelen;
296 uint32_t alloclen;
297 int ret, targetlen = strlen(target);
298
299 /* FIXME: If you care. We'd need to use frags for the target
300 if it grows much more than this */
301 if (targetlen > 254)
302 return -ENAMETOOLONG;
303
304 ri = jffs2_alloc_raw_inode();
305
306 if (!ri)
307 return -ENOMEM;
308
309 c = JFFS2_SB_INFO(dir_i->i_sb);
310
311 /* Try to reserve enough space for both node and dirent.
312 * Just the node will do for now, though
313 */
314 namelen = dentry->d_name.len;
315 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
316 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
317
318 if (ret) {
319 jffs2_free_raw_inode(ri);
320 return ret;
321 }
322
323 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
324
325 if (IS_ERR(inode)) {
326 jffs2_free_raw_inode(ri);
327 jffs2_complete_reservation(c);
328 return PTR_ERR(inode);
329 }
330
331 inode->i_op = &jffs2_symlink_inode_operations;
332
333 f = JFFS2_INODE_INFO(inode);
334
335 inode->i_size = targetlen;
336 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
337 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
338 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
339
340 ri->compr = JFFS2_COMPR_NONE;
341 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
342 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
343
344 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
345
346 jffs2_free_raw_inode(ri);
347
348 if (IS_ERR(fn)) {
349 /* Eeek. Wave bye bye */
350 mutex_unlock(&f->sem);
351 jffs2_complete_reservation(c);
352 ret = PTR_ERR(fn);
353 goto fail;
354 }
355
356 /* We use f->target field to store the target path. */
357 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
358 if (!f->target) {
359 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
360 mutex_unlock(&f->sem);
361 jffs2_complete_reservation(c);
362 ret = -ENOMEM;
363 goto fail;
364 }
365 inode->i_link = f->target;
366
367 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
368 __func__, (char *)f->target);
369
370 /* No data here. Only a metadata node, which will be
371 obsoleted by the first data write
372 */
373 f->metadata = fn;
374 mutex_unlock(&f->sem);
375
376 jffs2_complete_reservation(c);
377
378 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
379 if (ret)
380 goto fail;
381
382 ret = jffs2_init_acl_post(inode);
383 if (ret)
384 goto fail;
385
386 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
387 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
388 if (ret)
389 goto fail;
390
391 rd = jffs2_alloc_raw_dirent();
392 if (!rd) {
393 /* Argh. Now we treat it like a normal delete */
394 jffs2_complete_reservation(c);
395 ret = -ENOMEM;
396 goto fail;
397 }
398
399 dir_f = JFFS2_INODE_INFO(dir_i);
400 mutex_lock(&dir_f->sem);
401
402 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
403 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
404 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
405 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
406
407 rd->pino = cpu_to_je32(dir_i->i_ino);
408 rd->version = cpu_to_je32(++dir_f->highest_version);
409 rd->ino = cpu_to_je32(inode->i_ino);
410 rd->mctime = cpu_to_je32(JFFS2_NOW());
411 rd->nsize = namelen;
412 rd->type = DT_LNK;
413 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
414 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
415
416 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
417
418 if (IS_ERR(fd)) {
419 /* dirent failed to write. Delete the inode normally
420 as if it were the final unlink() */
421 jffs2_complete_reservation(c);
422 jffs2_free_raw_dirent(rd);
423 mutex_unlock(&dir_f->sem);
424 ret = PTR_ERR(fd);
425 goto fail;
426 }
427
428 inode_set_mtime_to_ts(dir_i,
429 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime))));
430
431 jffs2_free_raw_dirent(rd);
432
433 /* Link the fd into the inode's list, obsoleting an old
434 one if necessary. */
435 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
436
437 mutex_unlock(&dir_f->sem);
438 jffs2_complete_reservation(c);
439
440 d_instantiate_new(dentry, inode);
441 return 0;
442
443 fail:
444 iget_failed(inode);
445 return ret;
446}
447
448
449static int jffs2_mkdir (struct mnt_idmap *idmap, struct inode *dir_i,
450 struct dentry *dentry, umode_t mode)
451{
452 struct jffs2_inode_info *f, *dir_f;
453 struct jffs2_sb_info *c;
454 struct inode *inode;
455 struct jffs2_raw_inode *ri;
456 struct jffs2_raw_dirent *rd;
457 struct jffs2_full_dnode *fn;
458 struct jffs2_full_dirent *fd;
459 int namelen;
460 uint32_t alloclen;
461 int ret;
462
463 mode |= S_IFDIR;
464
465 ri = jffs2_alloc_raw_inode();
466 if (!ri)
467 return -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 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 PTR_ERR(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 0;
588
589 fail:
590 iget_failed(inode);
591 return ret;
592}
593
594static 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
623static int jffs2_mknod (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
772static int jffs2_rename (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