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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 *, void *, filldir_t);
26
27static int jffs2_create (struct inode *,struct dentry *,umode_t,
28 struct nameidata *);
29static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 struct nameidata *);
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 .readdir = 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 .setattr = jffs2_setattr,
63 .setxattr = jffs2_setxattr,
64 .getxattr = jffs2_getxattr,
65 .listxattr = jffs2_listxattr,
66 .removexattr = jffs2_removexattr
67};
68
69/***********************************************************************/
70
71
72/* We keep the dirent list sorted in increasing order of name hash,
73 and we use the same hash function as the dentries. Makes this
74 nice and simple
75*/
76static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
77 struct nameidata *nd)
78{
79 struct jffs2_inode_info *dir_f;
80 struct jffs2_full_dirent *fd = NULL, *fd_list;
81 uint32_t ino = 0;
82 struct inode *inode = NULL;
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 mutex_lock(&dir_f->sem);
92
93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
94 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
95 if (fd_list->nhash == target->d_name.hash &&
96 (!fd || fd_list->version > fd->version) &&
97 strlen(fd_list->name) == target->d_name.len &&
98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
99 fd = fd_list;
100 }
101 }
102 if (fd)
103 ino = fd->ino;
104 mutex_unlock(&dir_f->sem);
105 if (ino) {
106 inode = jffs2_iget(dir_i->i_sb, ino);
107 if (IS_ERR(inode))
108 pr_warn("iget() failed for ino #%u\n", ino);
109 }
110
111 return d_splice_alias(inode, target);
112}
113
114/***********************************************************************/
115
116
117static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
118{
119 struct jffs2_inode_info *f;
120 struct inode *inode = filp->f_path.dentry->d_inode;
121 struct jffs2_full_dirent *fd;
122 unsigned long offset, curofs;
123
124 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n",
125 filp->f_path.dentry->d_inode->i_ino);
126
127 f = JFFS2_INODE_INFO(inode);
128
129 offset = filp->f_pos;
130
131 if (offset == 0) {
132 jffs2_dbg(1, "Dirent 0: \".\", ino #%lu\n", inode->i_ino);
133 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
134 goto out;
135 offset++;
136 }
137 if (offset == 1) {
138 unsigned long pino = parent_ino(filp->f_path.dentry);
139 jffs2_dbg(1, "Dirent 1: \"..\", ino #%lu\n", pino);
140 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
141 goto out;
142 offset++;
143 }
144
145 curofs=1;
146 mutex_lock(&f->sem);
147 for (fd = f->dents; fd; fd = fd->next) {
148
149 curofs++;
150 /* First loop: curofs = 2; offset = 2 */
151 if (curofs < offset) {
152 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
153 fd->name, fd->ino, fd->type, curofs, offset);
154 continue;
155 }
156 if (!fd->ino) {
157 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
158 fd->name);
159 offset++;
160 continue;
161 }
162 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
163 offset, fd->name, fd->ino, fd->type);
164 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
165 break;
166 offset++;
167 }
168 mutex_unlock(&f->sem);
169 out:
170 filp->f_pos = offset;
171 return 0;
172}
173
174/***********************************************************************/
175
176
177static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
178 umode_t mode, struct nameidata *nd)
179{
180 struct jffs2_raw_inode *ri;
181 struct jffs2_inode_info *f, *dir_f;
182 struct jffs2_sb_info *c;
183 struct inode *inode;
184 int ret;
185
186 ri = jffs2_alloc_raw_inode();
187 if (!ri)
188 return -ENOMEM;
189
190 c = JFFS2_SB_INFO(dir_i->i_sb);
191
192 jffs2_dbg(1, "%s()\n", __func__);
193
194 inode = jffs2_new_inode(dir_i, mode, ri);
195
196 if (IS_ERR(inode)) {
197 jffs2_dbg(1, "jffs2_new_inode() failed\n");
198 jffs2_free_raw_inode(ri);
199 return PTR_ERR(inode);
200 }
201
202 inode->i_op = &jffs2_file_inode_operations;
203 inode->i_fop = &jffs2_file_operations;
204 inode->i_mapping->a_ops = &jffs2_file_address_operations;
205 inode->i_mapping->nrpages = 0;
206
207 f = JFFS2_INODE_INFO(inode);
208 dir_f = JFFS2_INODE_INFO(dir_i);
209
210 /* jffs2_do_create() will want to lock it, _after_ reserving
211 space and taking c-alloc_sem. If we keep it locked here,
212 lockdep gets unhappy (although it's a false positive;
213 nothing else will be looking at this inode yet so there's
214 no chance of AB-BA deadlock involving its f->sem). */
215 mutex_unlock(&f->sem);
216
217 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
218 if (ret)
219 goto fail;
220
221 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
222
223 jffs2_free_raw_inode(ri);
224
225 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
226 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
227 f->inocache->pino_nlink, inode->i_mapping->nrpages);
228
229 d_instantiate(dentry, inode);
230 unlock_new_inode(inode);
231 return 0;
232
233 fail:
234 iget_failed(inode);
235 jffs2_free_raw_inode(ri);
236 return ret;
237}
238
239/***********************************************************************/
240
241
242static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
243{
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
247 int ret;
248 uint32_t now = get_seconds();
249
250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
251 dentry->d_name.len, dead_f, now);
252 if (dead_f->inocache)
253 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink);
254 if (!ret)
255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
256 return ret;
257}
258/***********************************************************************/
259
260
261static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
262{
263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
266 int ret;
267 uint8_t type;
268 uint32_t now;
269
270 /* Don't let people make hard links to bad inodes. */
271 if (!f->inocache)
272 return -EIO;
273
274 if (S_ISDIR(old_dentry->d_inode->i_mode))
275 return -EPERM;
276
277 /* XXX: This is ugly */
278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
279 if (!type) type = DT_REG;
280
281 now = get_seconds();
282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
283
284 if (!ret) {
285 mutex_lock(&f->sem);
286 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink);
287 mutex_unlock(&f->sem);
288 d_instantiate(dentry, old_dentry->d_inode);
289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
290 ihold(old_dentry->d_inode);
291 }
292 return ret;
293}
294
295/***********************************************************************/
296
297static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
298{
299 struct jffs2_inode_info *f, *dir_f;
300 struct jffs2_sb_info *c;
301 struct inode *inode;
302 struct jffs2_raw_inode *ri;
303 struct jffs2_raw_dirent *rd;
304 struct jffs2_full_dnode *fn;
305 struct jffs2_full_dirent *fd;
306 int namelen;
307 uint32_t alloclen;
308 int ret, targetlen = strlen(target);
309
310 /* FIXME: If you care. We'd need to use frags for the target
311 if it grows much more than this */
312 if (targetlen > 254)
313 return -ENAMETOOLONG;
314
315 ri = jffs2_alloc_raw_inode();
316
317 if (!ri)
318 return -ENOMEM;
319
320 c = JFFS2_SB_INFO(dir_i->i_sb);
321
322 /* Try to reserve enough space for both node and dirent.
323 * Just the node will do for now, though
324 */
325 namelen = dentry->d_name.len;
326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
328
329 if (ret) {
330 jffs2_free_raw_inode(ri);
331 return ret;
332 }
333
334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
335
336 if (IS_ERR(inode)) {
337 jffs2_free_raw_inode(ri);
338 jffs2_complete_reservation(c);
339 return PTR_ERR(inode);
340 }
341
342 inode->i_op = &jffs2_symlink_inode_operations;
343
344 f = JFFS2_INODE_INFO(inode);
345
346 inode->i_size = targetlen;
347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
350
351 ri->compr = JFFS2_COMPR_NONE;
352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
354
355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
356
357 jffs2_free_raw_inode(ri);
358
359 if (IS_ERR(fn)) {
360 /* Eeek. Wave bye bye */
361 mutex_unlock(&f->sem);
362 jffs2_complete_reservation(c);
363 ret = PTR_ERR(fn);
364 goto fail;
365 }
366
367 /* We use f->target field to store the target path. */
368 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
369 if (!f->target) {
370 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
371 mutex_unlock(&f->sem);
372 jffs2_complete_reservation(c);
373 ret = -ENOMEM;
374 goto fail;
375 }
376
377 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
378 __func__, (char *)f->target);
379
380 /* No data here. Only a metadata node, which will be
381 obsoleted by the first data write
382 */
383 f->metadata = fn;
384 mutex_unlock(&f->sem);
385
386 jffs2_complete_reservation(c);
387
388 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
389 if (ret)
390 goto fail;
391
392 ret = jffs2_init_acl_post(inode);
393 if (ret)
394 goto fail;
395
396 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
397 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
398 if (ret)
399 goto fail;
400
401 rd = jffs2_alloc_raw_dirent();
402 if (!rd) {
403 /* Argh. Now we treat it like a normal delete */
404 jffs2_complete_reservation(c);
405 ret = -ENOMEM;
406 goto fail;
407 }
408
409 dir_f = JFFS2_INODE_INFO(dir_i);
410 mutex_lock(&dir_f->sem);
411
412 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
413 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
414 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
415 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
416
417 rd->pino = cpu_to_je32(dir_i->i_ino);
418 rd->version = cpu_to_je32(++dir_f->highest_version);
419 rd->ino = cpu_to_je32(inode->i_ino);
420 rd->mctime = cpu_to_je32(get_seconds());
421 rd->nsize = namelen;
422 rd->type = DT_LNK;
423 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
424 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
425
426 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
427
428 if (IS_ERR(fd)) {
429 /* dirent failed to write. Delete the inode normally
430 as if it were the final unlink() */
431 jffs2_complete_reservation(c);
432 jffs2_free_raw_dirent(rd);
433 mutex_unlock(&dir_f->sem);
434 ret = PTR_ERR(fd);
435 goto fail;
436 }
437
438 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
439
440 jffs2_free_raw_dirent(rd);
441
442 /* Link the fd into the inode's list, obsoleting an old
443 one if necessary. */
444 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
445
446 mutex_unlock(&dir_f->sem);
447 jffs2_complete_reservation(c);
448
449 d_instantiate(dentry, inode);
450 unlock_new_inode(inode);
451 return 0;
452
453 fail:
454 iget_failed(inode);
455 return ret;
456}
457
458
459static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
460{
461 struct jffs2_inode_info *f, *dir_f;
462 struct jffs2_sb_info *c;
463 struct inode *inode;
464 struct jffs2_raw_inode *ri;
465 struct jffs2_raw_dirent *rd;
466 struct jffs2_full_dnode *fn;
467 struct jffs2_full_dirent *fd;
468 int namelen;
469 uint32_t alloclen;
470 int ret;
471
472 mode |= S_IFDIR;
473
474 ri = jffs2_alloc_raw_inode();
475 if (!ri)
476 return -ENOMEM;
477
478 c = JFFS2_SB_INFO(dir_i->i_sb);
479
480 /* Try to reserve enough space for both node and dirent.
481 * Just the node will do for now, though
482 */
483 namelen = dentry->d_name.len;
484 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
485 JFFS2_SUMMARY_INODE_SIZE);
486
487 if (ret) {
488 jffs2_free_raw_inode(ri);
489 return ret;
490 }
491
492 inode = jffs2_new_inode(dir_i, mode, ri);
493
494 if (IS_ERR(inode)) {
495 jffs2_free_raw_inode(ri);
496 jffs2_complete_reservation(c);
497 return PTR_ERR(inode);
498 }
499
500 inode->i_op = &jffs2_dir_inode_operations;
501 inode->i_fop = &jffs2_dir_operations;
502
503 f = JFFS2_INODE_INFO(inode);
504
505 /* Directories get nlink 2 at start */
506 set_nlink(inode, 2);
507 /* but ic->pino_nlink is the parent ino# */
508 f->inocache->pino_nlink = dir_i->i_ino;
509
510 ri->data_crc = cpu_to_je32(0);
511 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
512
513 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
514
515 jffs2_free_raw_inode(ri);
516
517 if (IS_ERR(fn)) {
518 /* Eeek. Wave bye bye */
519 mutex_unlock(&f->sem);
520 jffs2_complete_reservation(c);
521 ret = PTR_ERR(fn);
522 goto fail;
523 }
524 /* No data here. Only a metadata node, which will be
525 obsoleted by the first data write
526 */
527 f->metadata = fn;
528 mutex_unlock(&f->sem);
529
530 jffs2_complete_reservation(c);
531
532 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
533 if (ret)
534 goto fail;
535
536 ret = jffs2_init_acl_post(inode);
537 if (ret)
538 goto fail;
539
540 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
541 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
542 if (ret)
543 goto fail;
544
545 rd = jffs2_alloc_raw_dirent();
546 if (!rd) {
547 /* Argh. Now we treat it like a normal delete */
548 jffs2_complete_reservation(c);
549 ret = -ENOMEM;
550 goto fail;
551 }
552
553 dir_f = JFFS2_INODE_INFO(dir_i);
554 mutex_lock(&dir_f->sem);
555
556 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
557 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
558 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
559 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
560
561 rd->pino = cpu_to_je32(dir_i->i_ino);
562 rd->version = cpu_to_je32(++dir_f->highest_version);
563 rd->ino = cpu_to_je32(inode->i_ino);
564 rd->mctime = cpu_to_je32(get_seconds());
565 rd->nsize = namelen;
566 rd->type = DT_DIR;
567 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
568 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
569
570 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
571
572 if (IS_ERR(fd)) {
573 /* dirent failed to write. Delete the inode normally
574 as if it were the final unlink() */
575 jffs2_complete_reservation(c);
576 jffs2_free_raw_dirent(rd);
577 mutex_unlock(&dir_f->sem);
578 ret = PTR_ERR(fd);
579 goto fail;
580 }
581
582 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
583 inc_nlink(dir_i);
584
585 jffs2_free_raw_dirent(rd);
586
587 /* Link the fd into the inode's list, obsoleting an old
588 one if necessary. */
589 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
590
591 mutex_unlock(&dir_f->sem);
592 jffs2_complete_reservation(c);
593
594 d_instantiate(dentry, inode);
595 unlock_new_inode(inode);
596 return 0;
597
598 fail:
599 iget_failed(inode);
600 return ret;
601}
602
603static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
604{
605 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
606 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
608 struct jffs2_full_dirent *fd;
609 int ret;
610 uint32_t now = get_seconds();
611
612 for (fd = f->dents ; fd; fd = fd->next) {
613 if (fd->ino)
614 return -ENOTEMPTY;
615 }
616
617 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
618 dentry->d_name.len, f, now);
619 if (!ret) {
620 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
621 clear_nlink(dentry->d_inode);
622 drop_nlink(dir_i);
623 }
624 return ret;
625}
626
627static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
628{
629 struct jffs2_inode_info *f, *dir_f;
630 struct jffs2_sb_info *c;
631 struct inode *inode;
632 struct jffs2_raw_inode *ri;
633 struct jffs2_raw_dirent *rd;
634 struct jffs2_full_dnode *fn;
635 struct jffs2_full_dirent *fd;
636 int namelen;
637 union jffs2_device_node dev;
638 int devlen = 0;
639 uint32_t alloclen;
640 int ret;
641
642 if (!new_valid_dev(rdev))
643 return -EINVAL;
644
645 ri = jffs2_alloc_raw_inode();
646 if (!ri)
647 return -ENOMEM;
648
649 c = JFFS2_SB_INFO(dir_i->i_sb);
650
651 if (S_ISBLK(mode) || S_ISCHR(mode))
652 devlen = jffs2_encode_dev(&dev, rdev);
653
654 /* Try to reserve enough space for both node and dirent.
655 * Just the node will do for now, though
656 */
657 namelen = dentry->d_name.len;
658 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
659 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
660
661 if (ret) {
662 jffs2_free_raw_inode(ri);
663 return ret;
664 }
665
666 inode = jffs2_new_inode(dir_i, mode, ri);
667
668 if (IS_ERR(inode)) {
669 jffs2_free_raw_inode(ri);
670 jffs2_complete_reservation(c);
671 return PTR_ERR(inode);
672 }
673 inode->i_op = &jffs2_file_inode_operations;
674 init_special_inode(inode, inode->i_mode, rdev);
675
676 f = JFFS2_INODE_INFO(inode);
677
678 ri->dsize = ri->csize = cpu_to_je32(devlen);
679 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
680 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
681
682 ri->compr = JFFS2_COMPR_NONE;
683 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
684 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
685
686 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
687
688 jffs2_free_raw_inode(ri);
689
690 if (IS_ERR(fn)) {
691 /* Eeek. Wave bye bye */
692 mutex_unlock(&f->sem);
693 jffs2_complete_reservation(c);
694 ret = PTR_ERR(fn);
695 goto fail;
696 }
697 /* No data here. Only a metadata node, which will be
698 obsoleted by the first data write
699 */
700 f->metadata = fn;
701 mutex_unlock(&f->sem);
702
703 jffs2_complete_reservation(c);
704
705 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
706 if (ret)
707 goto fail;
708
709 ret = jffs2_init_acl_post(inode);
710 if (ret)
711 goto fail;
712
713 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
714 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
715 if (ret)
716 goto fail;
717
718 rd = jffs2_alloc_raw_dirent();
719 if (!rd) {
720 /* Argh. Now we treat it like a normal delete */
721 jffs2_complete_reservation(c);
722 ret = -ENOMEM;
723 goto fail;
724 }
725
726 dir_f = JFFS2_INODE_INFO(dir_i);
727 mutex_lock(&dir_f->sem);
728
729 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
730 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
731 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
732 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
733
734 rd->pino = cpu_to_je32(dir_i->i_ino);
735 rd->version = cpu_to_je32(++dir_f->highest_version);
736 rd->ino = cpu_to_je32(inode->i_ino);
737 rd->mctime = cpu_to_je32(get_seconds());
738 rd->nsize = namelen;
739
740 /* XXX: This is ugly. */
741 rd->type = (mode & S_IFMT) >> 12;
742
743 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
744 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
745
746 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
747
748 if (IS_ERR(fd)) {
749 /* dirent failed to write. Delete the inode normally
750 as if it were the final unlink() */
751 jffs2_complete_reservation(c);
752 jffs2_free_raw_dirent(rd);
753 mutex_unlock(&dir_f->sem);
754 ret = PTR_ERR(fd);
755 goto fail;
756 }
757
758 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
759
760 jffs2_free_raw_dirent(rd);
761
762 /* Link the fd into the inode's list, obsoleting an old
763 one if necessary. */
764 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
765
766 mutex_unlock(&dir_f->sem);
767 jffs2_complete_reservation(c);
768
769 d_instantiate(dentry, inode);
770 unlock_new_inode(inode);
771 return 0;
772
773 fail:
774 iget_failed(inode);
775 return ret;
776}
777
778static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
779 struct inode *new_dir_i, struct dentry *new_dentry)
780{
781 int ret;
782 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
783 struct jffs2_inode_info *victim_f = NULL;
784 uint8_t type;
785 uint32_t now;
786
787 /* The VFS will check for us and prevent trying to rename a
788 * file over a directory and vice versa, but if it's a directory,
789 * the VFS can't check whether the victim is empty. The filesystem
790 * needs to do that for itself.
791 */
792 if (new_dentry->d_inode) {
793 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
794 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
795 struct jffs2_full_dirent *fd;
796
797 mutex_lock(&victim_f->sem);
798 for (fd = victim_f->dents; fd; fd = fd->next) {
799 if (fd->ino) {
800 mutex_unlock(&victim_f->sem);
801 return -ENOTEMPTY;
802 }
803 }
804 mutex_unlock(&victim_f->sem);
805 }
806 }
807
808 /* XXX: We probably ought to alloc enough space for
809 both nodes at the same time. Writing the new link,
810 then getting -ENOSPC, is quite bad :)
811 */
812
813 /* Make a hard link */
814
815 /* XXX: This is ugly */
816 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
817 if (!type) type = DT_REG;
818
819 now = get_seconds();
820 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
821 old_dentry->d_inode->i_ino, type,
822 new_dentry->d_name.name, new_dentry->d_name.len, now);
823
824 if (ret)
825 return ret;
826
827 if (victim_f) {
828 /* There was a victim. Kill it off nicely */
829 if (S_ISDIR(new_dentry->d_inode->i_mode))
830 clear_nlink(new_dentry->d_inode);
831 else
832 drop_nlink(new_dentry->d_inode);
833 /* Don't oops if the victim was a dirent pointing to an
834 inode which didn't exist. */
835 if (victim_f->inocache) {
836 mutex_lock(&victim_f->sem);
837 if (S_ISDIR(new_dentry->d_inode->i_mode))
838 victim_f->inocache->pino_nlink = 0;
839 else
840 victim_f->inocache->pino_nlink--;
841 mutex_unlock(&victim_f->sem);
842 }
843 }
844
845 /* If it was a directory we moved, and there was no victim,
846 increase i_nlink on its new parent */
847 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
848 inc_nlink(new_dir_i);
849
850 /* Unlink the original */
851 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
852 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
853
854 /* We don't touch inode->i_nlink */
855
856 if (ret) {
857 /* Oh shit. We really ought to make a single node which can do both atomically */
858 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
859 mutex_lock(&f->sem);
860 inc_nlink(old_dentry->d_inode);
861 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
862 f->inocache->pino_nlink++;
863 mutex_unlock(&f->sem);
864
865 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
866 __func__, ret);
867 /* Might as well let the VFS know */
868 d_instantiate(new_dentry, old_dentry->d_inode);
869 ihold(old_dentry->d_inode);
870 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
871 return ret;
872 }
873
874 if (S_ISDIR(old_dentry->d_inode->i_mode))
875 drop_nlink(old_dir_i);
876
877 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
878
879 return 0;
880}
881
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 unsigned int);
40
41const 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
51const 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*/
75static 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
120static 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
160static 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
224static 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
243static 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
279static 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
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(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
584static 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
608static 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
755static 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