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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#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/fs.h>
16#include <linux/crc32.h>
17#include <linux/jffs2.h>
18#include "jffs2_fs_i.h"
19#include "jffs2_fs_sb.h"
20#include <linux/time.h>
21#include "nodelist.h"
22
23static int jffs2_readdir (struct file *, void *, filldir_t);
24
25static int jffs2_create (struct inode *,struct dentry *,int,
26 struct nameidata *);
27static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
28 struct nameidata *);
29static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
30static int jffs2_unlink (struct inode *,struct dentry *);
31static int jffs2_symlink (struct inode *,struct dentry *,const char *);
32static int jffs2_mkdir (struct inode *,struct dentry *,int);
33static int jffs2_rmdir (struct inode *,struct dentry *);
34static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
35static int jffs2_rename (struct inode *, struct dentry *,
36 struct inode *, struct dentry *);
37
38const struct file_operations jffs2_dir_operations =
39{
40 .read = generic_read_dir,
41 .readdir = jffs2_readdir,
42 .unlocked_ioctl=jffs2_ioctl,
43 .fsync = jffs2_fsync,
44 .llseek = generic_file_llseek,
45};
46
47
48const struct inode_operations jffs2_dir_inode_operations =
49{
50 .create = jffs2_create,
51 .lookup = jffs2_lookup,
52 .link = jffs2_link,
53 .unlink = jffs2_unlink,
54 .symlink = jffs2_symlink,
55 .mkdir = jffs2_mkdir,
56 .rmdir = jffs2_rmdir,
57 .mknod = jffs2_mknod,
58 .rename = jffs2_rename,
59 .get_acl = jffs2_get_acl,
60 .setattr = jffs2_setattr,
61 .setxattr = jffs2_setxattr,
62 .getxattr = jffs2_getxattr,
63 .listxattr = jffs2_listxattr,
64 .removexattr = jffs2_removexattr
65};
66
67/***********************************************************************/
68
69
70/* We keep the dirent list sorted in increasing order of name hash,
71 and we use the same hash function as the dentries. Makes this
72 nice and simple
73*/
74static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
75 struct nameidata *nd)
76{
77 struct jffs2_inode_info *dir_f;
78 struct jffs2_full_dirent *fd = NULL, *fd_list;
79 uint32_t ino = 0;
80 struct inode *inode = NULL;
81
82 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
83
84 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
85 return ERR_PTR(-ENAMETOOLONG);
86
87 dir_f = JFFS2_INODE_INFO(dir_i);
88
89 mutex_lock(&dir_f->sem);
90
91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
93 if (fd_list->nhash == target->d_name.hash &&
94 (!fd || fd_list->version > fd->version) &&
95 strlen(fd_list->name) == target->d_name.len &&
96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
97 fd = fd_list;
98 }
99 }
100 if (fd)
101 ino = fd->ino;
102 mutex_unlock(&dir_f->sem);
103 if (ino) {
104 inode = jffs2_iget(dir_i->i_sb, ino);
105 if (IS_ERR(inode))
106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107 }
108
109 return d_splice_alias(inode, target);
110}
111
112/***********************************************************************/
113
114
115static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
116{
117 struct jffs2_inode_info *f;
118 struct inode *inode = filp->f_path.dentry->d_inode;
119 struct jffs2_full_dirent *fd;
120 unsigned long offset, curofs;
121
122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
123
124 f = JFFS2_INODE_INFO(inode);
125
126 offset = filp->f_pos;
127
128 if (offset == 0) {
129 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
130 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
131 goto out;
132 offset++;
133 }
134 if (offset == 1) {
135 unsigned long pino = parent_ino(filp->f_path.dentry);
136 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
137 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
138 goto out;
139 offset++;
140 }
141
142 curofs=1;
143 mutex_lock(&f->sem);
144 for (fd = f->dents; fd; fd = fd->next) {
145
146 curofs++;
147 /* First loop: curofs = 2; offset = 2 */
148 if (curofs < offset) {
149 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
150 fd->name, fd->ino, fd->type, curofs, offset));
151 continue;
152 }
153 if (!fd->ino) {
154 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
155 offset++;
156 continue;
157 }
158 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
159 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
160 break;
161 offset++;
162 }
163 mutex_unlock(&f->sem);
164 out:
165 filp->f_pos = offset;
166 return 0;
167}
168
169/***********************************************************************/
170
171
172static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
173 struct nameidata *nd)
174{
175 struct jffs2_raw_inode *ri;
176 struct jffs2_inode_info *f, *dir_f;
177 struct jffs2_sb_info *c;
178 struct inode *inode;
179 int ret;
180
181 ri = jffs2_alloc_raw_inode();
182 if (!ri)
183 return -ENOMEM;
184
185 c = JFFS2_SB_INFO(dir_i->i_sb);
186
187 D1(printk(KERN_DEBUG "jffs2_create()\n"));
188
189 inode = jffs2_new_inode(dir_i, mode, ri);
190
191 if (IS_ERR(inode)) {
192 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
193 jffs2_free_raw_inode(ri);
194 return PTR_ERR(inode);
195 }
196
197 inode->i_op = &jffs2_file_inode_operations;
198 inode->i_fop = &jffs2_file_operations;
199 inode->i_mapping->a_ops = &jffs2_file_address_operations;
200 inode->i_mapping->nrpages = 0;
201
202 f = JFFS2_INODE_INFO(inode);
203 dir_f = JFFS2_INODE_INFO(dir_i);
204
205 /* jffs2_do_create() will want to lock it, _after_ reserving
206 space and taking c-alloc_sem. If we keep it locked here,
207 lockdep gets unhappy (although it's a false positive;
208 nothing else will be looking at this inode yet so there's
209 no chance of AB-BA deadlock involving its f->sem). */
210 mutex_unlock(&f->sem);
211
212 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
213 if (ret)
214 goto fail;
215
216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
217
218 jffs2_free_raw_inode(ri);
219
220 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
221 inode->i_ino, inode->i_mode, inode->i_nlink,
222 f->inocache->pino_nlink, inode->i_mapping->nrpages));
223
224 d_instantiate(dentry, inode);
225 unlock_new_inode(inode);
226 return 0;
227
228 fail:
229 iget_failed(inode);
230 jffs2_free_raw_inode(ri);
231 return ret;
232}
233
234/***********************************************************************/
235
236
237static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
238{
239 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
240 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
241 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
242 int ret;
243 uint32_t now = get_seconds();
244
245 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
246 dentry->d_name.len, dead_f, now);
247 if (dead_f->inocache)
248 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
249 if (!ret)
250 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
251 return ret;
252}
253/***********************************************************************/
254
255
256static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
257{
258 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
259 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
260 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
261 int ret;
262 uint8_t type;
263 uint32_t now;
264
265 /* Don't let people make hard links to bad inodes. */
266 if (!f->inocache)
267 return -EIO;
268
269 if (S_ISDIR(old_dentry->d_inode->i_mode))
270 return -EPERM;
271
272 /* XXX: This is ugly */
273 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
274 if (!type) type = DT_REG;
275
276 now = get_seconds();
277 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
278
279 if (!ret) {
280 mutex_lock(&f->sem);
281 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
282 mutex_unlock(&f->sem);
283 d_instantiate(dentry, old_dentry->d_inode);
284 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
285 ihold(old_dentry->d_inode);
286 }
287 return ret;
288}
289
290/***********************************************************************/
291
292static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
293{
294 struct jffs2_inode_info *f, *dir_f;
295 struct jffs2_sb_info *c;
296 struct inode *inode;
297 struct jffs2_raw_inode *ri;
298 struct jffs2_raw_dirent *rd;
299 struct jffs2_full_dnode *fn;
300 struct jffs2_full_dirent *fd;
301 int namelen;
302 uint32_t alloclen;
303 int ret, targetlen = strlen(target);
304
305 /* FIXME: If you care. We'd need to use frags for the target
306 if it grows much more than this */
307 if (targetlen > 254)
308 return -ENAMETOOLONG;
309
310 ri = jffs2_alloc_raw_inode();
311
312 if (!ri)
313 return -ENOMEM;
314
315 c = JFFS2_SB_INFO(dir_i->i_sb);
316
317 /* Try to reserve enough space for both node and dirent.
318 * Just the node will do for now, though
319 */
320 namelen = dentry->d_name.len;
321 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
322 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
323
324 if (ret) {
325 jffs2_free_raw_inode(ri);
326 return ret;
327 }
328
329 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
330
331 if (IS_ERR(inode)) {
332 jffs2_free_raw_inode(ri);
333 jffs2_complete_reservation(c);
334 return PTR_ERR(inode);
335 }
336
337 inode->i_op = &jffs2_symlink_inode_operations;
338
339 f = JFFS2_INODE_INFO(inode);
340
341 inode->i_size = targetlen;
342 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
343 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
344 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
345
346 ri->compr = JFFS2_COMPR_NONE;
347 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
348 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
349
350 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
351
352 jffs2_free_raw_inode(ri);
353
354 if (IS_ERR(fn)) {
355 /* Eeek. Wave bye bye */
356 mutex_unlock(&f->sem);
357 jffs2_complete_reservation(c);
358 ret = PTR_ERR(fn);
359 goto fail;
360 }
361
362 /* We use f->target field to store the target path. */
363 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
364 if (!f->target) {
365 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
366 mutex_unlock(&f->sem);
367 jffs2_complete_reservation(c);
368 ret = -ENOMEM;
369 goto fail;
370 }
371
372 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
373
374 /* No data here. Only a metadata node, which will be
375 obsoleted by the first data write
376 */
377 f->metadata = fn;
378 mutex_unlock(&f->sem);
379
380 jffs2_complete_reservation(c);
381
382 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
383 if (ret)
384 goto fail;
385
386 ret = jffs2_init_acl_post(inode);
387 if (ret)
388 goto fail;
389
390 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
391 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
392 if (ret)
393 goto fail;
394
395 rd = jffs2_alloc_raw_dirent();
396 if (!rd) {
397 /* Argh. Now we treat it like a normal delete */
398 jffs2_complete_reservation(c);
399 ret = -ENOMEM;
400 goto fail;
401 }
402
403 dir_f = JFFS2_INODE_INFO(dir_i);
404 mutex_lock(&dir_f->sem);
405
406 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
407 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
408 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
409 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
410
411 rd->pino = cpu_to_je32(dir_i->i_ino);
412 rd->version = cpu_to_je32(++dir_f->highest_version);
413 rd->ino = cpu_to_je32(inode->i_ino);
414 rd->mctime = cpu_to_je32(get_seconds());
415 rd->nsize = namelen;
416 rd->type = DT_LNK;
417 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
418 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
419
420 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
421
422 if (IS_ERR(fd)) {
423 /* dirent failed to write. Delete the inode normally
424 as if it were the final unlink() */
425 jffs2_complete_reservation(c);
426 jffs2_free_raw_dirent(rd);
427 mutex_unlock(&dir_f->sem);
428 ret = PTR_ERR(fd);
429 goto fail;
430 }
431
432 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
433
434 jffs2_free_raw_dirent(rd);
435
436 /* Link the fd into the inode's list, obsoleting an old
437 one if necessary. */
438 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
439
440 mutex_unlock(&dir_f->sem);
441 jffs2_complete_reservation(c);
442
443 d_instantiate(dentry, inode);
444 unlock_new_inode(inode);
445 return 0;
446
447 fail:
448 iget_failed(inode);
449 return ret;
450}
451
452
453static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
454{
455 struct jffs2_inode_info *f, *dir_f;
456 struct jffs2_sb_info *c;
457 struct inode *inode;
458 struct jffs2_raw_inode *ri;
459 struct jffs2_raw_dirent *rd;
460 struct jffs2_full_dnode *fn;
461 struct jffs2_full_dirent *fd;
462 int namelen;
463 uint32_t alloclen;
464 int ret;
465
466 mode |= S_IFDIR;
467
468 ri = jffs2_alloc_raw_inode();
469 if (!ri)
470 return -ENOMEM;
471
472 c = JFFS2_SB_INFO(dir_i->i_sb);
473
474 /* Try to reserve enough space for both node and dirent.
475 * Just the node will do for now, though
476 */
477 namelen = dentry->d_name.len;
478 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
479 JFFS2_SUMMARY_INODE_SIZE);
480
481 if (ret) {
482 jffs2_free_raw_inode(ri);
483 return ret;
484 }
485
486 inode = jffs2_new_inode(dir_i, mode, ri);
487
488 if (IS_ERR(inode)) {
489 jffs2_free_raw_inode(ri);
490 jffs2_complete_reservation(c);
491 return PTR_ERR(inode);
492 }
493
494 inode->i_op = &jffs2_dir_inode_operations;
495 inode->i_fop = &jffs2_dir_operations;
496
497 f = JFFS2_INODE_INFO(inode);
498
499 /* Directories get nlink 2 at start */
500 inode->i_nlink = 2;
501 /* but ic->pino_nlink is the parent ino# */
502 f->inocache->pino_nlink = dir_i->i_ino;
503
504 ri->data_crc = cpu_to_je32(0);
505 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
506
507 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
508
509 jffs2_free_raw_inode(ri);
510
511 if (IS_ERR(fn)) {
512 /* Eeek. Wave bye bye */
513 mutex_unlock(&f->sem);
514 jffs2_complete_reservation(c);
515 ret = PTR_ERR(fn);
516 goto fail;
517 }
518 /* No data here. Only a metadata node, which will be
519 obsoleted by the first data write
520 */
521 f->metadata = fn;
522 mutex_unlock(&f->sem);
523
524 jffs2_complete_reservation(c);
525
526 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
527 if (ret)
528 goto fail;
529
530 ret = jffs2_init_acl_post(inode);
531 if (ret)
532 goto fail;
533
534 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
535 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
536 if (ret)
537 goto fail;
538
539 rd = jffs2_alloc_raw_dirent();
540 if (!rd) {
541 /* Argh. Now we treat it like a normal delete */
542 jffs2_complete_reservation(c);
543 ret = -ENOMEM;
544 goto fail;
545 }
546
547 dir_f = JFFS2_INODE_INFO(dir_i);
548 mutex_lock(&dir_f->sem);
549
550 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
551 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
552 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
553 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
554
555 rd->pino = cpu_to_je32(dir_i->i_ino);
556 rd->version = cpu_to_je32(++dir_f->highest_version);
557 rd->ino = cpu_to_je32(inode->i_ino);
558 rd->mctime = cpu_to_je32(get_seconds());
559 rd->nsize = namelen;
560 rd->type = DT_DIR;
561 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
562 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
563
564 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
565
566 if (IS_ERR(fd)) {
567 /* dirent failed to write. Delete the inode normally
568 as if it were the final unlink() */
569 jffs2_complete_reservation(c);
570 jffs2_free_raw_dirent(rd);
571 mutex_unlock(&dir_f->sem);
572 ret = PTR_ERR(fd);
573 goto fail;
574 }
575
576 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
577 inc_nlink(dir_i);
578
579 jffs2_free_raw_dirent(rd);
580
581 /* Link the fd into the inode's list, obsoleting an old
582 one if necessary. */
583 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
584
585 mutex_unlock(&dir_f->sem);
586 jffs2_complete_reservation(c);
587
588 d_instantiate(dentry, inode);
589 unlock_new_inode(inode);
590 return 0;
591
592 fail:
593 iget_failed(inode);
594 return ret;
595}
596
597static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
598{
599 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
600 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
601 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
602 struct jffs2_full_dirent *fd;
603 int ret;
604 uint32_t now = get_seconds();
605
606 for (fd = f->dents ; fd; fd = fd->next) {
607 if (fd->ino)
608 return -ENOTEMPTY;
609 }
610
611 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
612 dentry->d_name.len, f, now);
613 if (!ret) {
614 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
615 clear_nlink(dentry->d_inode);
616 drop_nlink(dir_i);
617 }
618 return ret;
619}
620
621static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
622{
623 struct jffs2_inode_info *f, *dir_f;
624 struct jffs2_sb_info *c;
625 struct inode *inode;
626 struct jffs2_raw_inode *ri;
627 struct jffs2_raw_dirent *rd;
628 struct jffs2_full_dnode *fn;
629 struct jffs2_full_dirent *fd;
630 int namelen;
631 union jffs2_device_node dev;
632 int devlen = 0;
633 uint32_t alloclen;
634 int ret;
635
636 if (!new_valid_dev(rdev))
637 return -EINVAL;
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(get_seconds());
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 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
753
754 jffs2_free_raw_dirent(rd);
755
756 /* Link the fd into the inode's list, obsoleting an old
757 one if necessary. */
758 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
759
760 mutex_unlock(&dir_f->sem);
761 jffs2_complete_reservation(c);
762
763 d_instantiate(dentry, inode);
764 unlock_new_inode(inode);
765 return 0;
766
767 fail:
768 iget_failed(inode);
769 return ret;
770}
771
772static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
773 struct inode *new_dir_i, struct dentry *new_dentry)
774{
775 int ret;
776 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
777 struct jffs2_inode_info *victim_f = NULL;
778 uint8_t type;
779 uint32_t now;
780
781 /* The VFS will check for us and prevent trying to rename a
782 * file over a directory and vice versa, but if it's a directory,
783 * the VFS can't check whether the victim is empty. The filesystem
784 * needs to do that for itself.
785 */
786 if (new_dentry->d_inode) {
787 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
788 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
789 struct jffs2_full_dirent *fd;
790
791 mutex_lock(&victim_f->sem);
792 for (fd = victim_f->dents; fd; fd = fd->next) {
793 if (fd->ino) {
794 mutex_unlock(&victim_f->sem);
795 return -ENOTEMPTY;
796 }
797 }
798 mutex_unlock(&victim_f->sem);
799 }
800 }
801
802 /* XXX: We probably ought to alloc enough space for
803 both nodes at the same time. Writing the new link,
804 then getting -ENOSPC, is quite bad :)
805 */
806
807 /* Make a hard link */
808
809 /* XXX: This is ugly */
810 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
811 if (!type) type = DT_REG;
812
813 now = get_seconds();
814 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
815 old_dentry->d_inode->i_ino, type,
816 new_dentry->d_name.name, new_dentry->d_name.len, now);
817
818 if (ret)
819 return ret;
820
821 if (victim_f) {
822 /* There was a victim. Kill it off nicely */
823 if (S_ISDIR(new_dentry->d_inode->i_mode))
824 clear_nlink(new_dentry->d_inode);
825 else
826 drop_nlink(new_dentry->d_inode);
827 /* Don't oops if the victim was a dirent pointing to an
828 inode which didn't exist. */
829 if (victim_f->inocache) {
830 mutex_lock(&victim_f->sem);
831 if (S_ISDIR(new_dentry->d_inode->i_mode))
832 victim_f->inocache->pino_nlink = 0;
833 else
834 victim_f->inocache->pino_nlink--;
835 mutex_unlock(&victim_f->sem);
836 }
837 }
838
839 /* If it was a directory we moved, and there was no victim,
840 increase i_nlink on its new parent */
841 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
842 inc_nlink(new_dir_i);
843
844 /* Unlink the original */
845 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
846 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
847
848 /* We don't touch inode->i_nlink */
849
850 if (ret) {
851 /* Oh shit. We really ought to make a single node which can do both atomically */
852 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
853 mutex_lock(&f->sem);
854 inc_nlink(old_dentry->d_inode);
855 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
856 f->inocache->pino_nlink++;
857 mutex_unlock(&f->sem);
858
859 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
860 /* Might as well let the VFS know */
861 d_instantiate(new_dentry, old_dentry->d_inode);
862 ihold(old_dentry->d_inode);
863 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
864 return ret;
865 }
866
867 if (S_ISDIR(old_dentry->d_inode->i_mode))
868 drop_nlink(old_dir_i);
869
870 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
871
872 return 0;
873}
874
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