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[IPCONFIG]: ip_auto_config fix
[linux-2.6/btrfs-unstable.git] / fs / jffs2 / dir.c
blobc1dfca310dd6089341628d17513fb9efb9f70c1e
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/fs.h>
15 #include <linux/crc32.h>
16 #include <linux/jffs2.h>
17 #include "jffs2_fs_i.h"
18 #include "jffs2_fs_sb.h"
19 #include <linux/time.h>
20 #include "nodelist.h"
21
22 static int jffs2_readdir (struct file *, void *, filldir_t);
23
24 static int jffs2_create (struct inode *,struct dentry *,int,
25 struct nameidata *);
26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
27 struct nameidata *);
28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
29 static int jffs2_unlink (struct inode *,struct dentry *);
30 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
31 static int jffs2_mkdir (struct inode *,struct dentry *,int);
32 static int jffs2_rmdir (struct inode *,struct dentry *);
33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
34 static int jffs2_rename (struct inode *, struct dentry *,
35 struct inode *, struct dentry *);
36
37 const struct file_operations jffs2_dir_operations =
38 {
39 .read = generic_read_dir,
40 .readdir = jffs2_readdir,
41 .ioctl = jffs2_ioctl,
42 .fsync = jffs2_fsync
43 };
44
45
46 const struct inode_operations jffs2_dir_inode_operations =
47 {
48 .create = jffs2_create,
49 .lookup = jffs2_lookup,
50 .link = jffs2_link,
51 .unlink = jffs2_unlink,
52 .symlink = jffs2_symlink,
53 .mkdir = jffs2_mkdir,
54 .rmdir = jffs2_rmdir,
55 .mknod = jffs2_mknod,
56 .rename = jffs2_rename,
57 .permission = jffs2_permission,
58 .setattr = jffs2_setattr,
59 .setxattr = jffs2_setxattr,
60 .getxattr = jffs2_getxattr,
61 .listxattr = jffs2_listxattr,
62 .removexattr = jffs2_removexattr
63 };
64
65 /***********************************************************************/
66
67
68 /* We keep the dirent list sorted in increasing order of name hash,
69 and we use the same hash function as the dentries. Makes this
70 nice and simple
71 */
72 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
73 struct nameidata *nd)
74 {
75 struct jffs2_inode_info *dir_f;
76 struct jffs2_sb_info *c;
77 struct jffs2_full_dirent *fd = NULL, *fd_list;
78 uint32_t ino = 0;
79 struct inode *inode = NULL;
80
81 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
82
83 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
84 return ERR_PTR(-ENAMETOOLONG);
85
86 dir_f = JFFS2_INODE_INFO(dir_i);
87 c = JFFS2_SB_INFO(dir_i->i_sb);
88
89 down(&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 up(&dir_f->sem);
103 if (ino) {
104 inode = iget(dir_i->i_sb, ino);
105 if (!inode) {
106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107 return (ERR_PTR(-EIO));
108 }
109 }
110
111 d_add(target, inode);
112
113 return NULL;
114 }
115
116 /***********************************************************************/
117
118
119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
120 {
121 struct jffs2_inode_info *f;
122 struct jffs2_sb_info *c;
123 struct inode *inode = filp->f_path.dentry->d_inode;
124 struct jffs2_full_dirent *fd;
125 unsigned long offset, curofs;
126
127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
128
129 f = JFFS2_INODE_INFO(inode);
130 c = JFFS2_SB_INFO(inode->i_sb);
131
132 offset = filp->f_pos;
133
134 if (offset == 0) {
135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
137 goto out;
138 offset++;
139 }
140 if (offset == 1) {
141 unsigned long pino = parent_ino(filp->f_path.dentry);
142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
144 goto out;
145 offset++;
146 }
147
148 curofs=1;
149 down(&f->sem);
150 for (fd = f->dents; fd; fd = fd->next) {
151
152 curofs++;
153 /* First loop: curofs = 2; offset = 2 */
154 if (curofs < offset) {
155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
156 fd->name, fd->ino, fd->type, curofs, offset));
157 continue;
158 }
159 if (!fd->ino) {
160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
161 offset++;
162 continue;
163 }
164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
166 break;
167 offset++;
168 }
169 up(&f->sem);
170 out:
171 filp->f_pos = offset;
172 return 0;
173 }
174
175 /***********************************************************************/
176
177
178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
179 struct nameidata *nd)
180 {
181 struct jffs2_raw_inode *ri;
182 struct jffs2_inode_info *f, *dir_f;
183 struct jffs2_sb_info *c;
184 struct inode *inode;
185 int ret;
186
187 ri = jffs2_alloc_raw_inode();
188 if (!ri)
189 return -ENOMEM;
190
191 c = JFFS2_SB_INFO(dir_i->i_sb);
192
193 D1(printk(KERN_DEBUG "jffs2_create()\n"));
194
195 inode = jffs2_new_inode(dir_i, mode, ri);
196
197 if (IS_ERR(inode)) {
198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
199 jffs2_free_raw_inode(ri);
200 return PTR_ERR(inode);
201 }
202
203 inode->i_op = &jffs2_file_inode_operations;
204 inode->i_fop = &jffs2_file_operations;
205 inode->i_mapping->a_ops = &jffs2_file_address_operations;
206 inode->i_mapping->nrpages = 0;
207
208 f = JFFS2_INODE_INFO(inode);
209 dir_f = JFFS2_INODE_INFO(dir_i);
210
211 ret = jffs2_do_create(c, dir_f, f, ri,
212 dentry->d_name.name, dentry->d_name.len);
213
214 if (ret)
215 goto fail;
216
217 ret = jffs2_init_security(inode, dir_i);
218 if (ret)
219 goto fail;
220 ret = jffs2_init_acl(inode, dir_i);
221 if (ret)
222 goto fail;
223
224 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
225
226 jffs2_free_raw_inode(ri);
227 d_instantiate(dentry, inode);
228
229 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
230 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
231 return 0;
232
233 fail:
234 make_bad_inode(inode);
235 iput(inode);
236 jffs2_free_raw_inode(ri);
237 return ret;
238 }
239
240 /***********************************************************************/
241
242
243 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
244 {
245 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
247 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
248 int ret;
249 uint32_t now = get_seconds();
250
251 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
252 dentry->d_name.len, dead_f, now);
253 if (dead_f->inocache)
254 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
255 if (!ret)
256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
257 return ret;
258 }
259 /***********************************************************************/
260
261
262 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
263 {
264 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
265 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
266 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
267 int ret;
268 uint8_t type;
269 uint32_t now;
270
271 /* Don't let people make hard links to bad inodes. */
272 if (!f->inocache)
273 return -EIO;
274
275 if (S_ISDIR(old_dentry->d_inode->i_mode))
276 return -EPERM;
277
278 /* XXX: This is ugly */
279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
280 if (!type) type = DT_REG;
281
282 now = get_seconds();
283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
284
285 if (!ret) {
286 down(&f->sem);
287 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
288 up(&f->sem);
289 d_instantiate(dentry, old_dentry->d_inode);
290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
291 atomic_inc(&old_dentry->d_inode->i_count);
292 }
293 return ret;
294 }
295
296 /***********************************************************************/
297
298 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
299 {
300 struct jffs2_inode_info *f, *dir_f;
301 struct jffs2_sb_info *c;
302 struct inode *inode;
303 struct jffs2_raw_inode *ri;
304 struct jffs2_raw_dirent *rd;
305 struct jffs2_full_dnode *fn;
306 struct jffs2_full_dirent *fd;
307 int namelen;
308 uint32_t alloclen;
309 int ret, targetlen = strlen(target);
310
311 /* FIXME: If you care. We'd need to use frags for the target
312 if it grows much more than this */
313 if (targetlen > 254)
314 return -EINVAL;
315
316 ri = jffs2_alloc_raw_inode();
317
318 if (!ri)
319 return -ENOMEM;
320
321 c = JFFS2_SB_INFO(dir_i->i_sb);
322
323 /* Try to reserve enough space for both node and dirent.
324 * Just the node will do for now, though
325 */
326 namelen = dentry->d_name.len;
327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
329
330 if (ret) {
331 jffs2_free_raw_inode(ri);
332 return ret;
333 }
334
335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
336
337 if (IS_ERR(inode)) {
338 jffs2_free_raw_inode(ri);
339 jffs2_complete_reservation(c);
340 return PTR_ERR(inode);
341 }
342
343 inode->i_op = &jffs2_symlink_inode_operations;
344
345 f = JFFS2_INODE_INFO(inode);
346
347 inode->i_size = targetlen;
348 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
349 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
350 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
351
352 ri->compr = JFFS2_COMPR_NONE;
353 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
354 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
355
356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
357
358 jffs2_free_raw_inode(ri);
359
360 if (IS_ERR(fn)) {
361 /* Eeek. Wave bye bye */
362 up(&f->sem);
363 jffs2_complete_reservation(c);
364 jffs2_clear_inode(inode);
365 return PTR_ERR(fn);
366 }
367
368 /* We use f->target field to store the target path. */
369 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
370 if (!f->target) {
371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
372 up(&f->sem);
373 jffs2_complete_reservation(c);
374 jffs2_clear_inode(inode);
375 return -ENOMEM;
376 }
377
378 memcpy(f->target, target, targetlen + 1);
379 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
380
381 /* No data here. Only a metadata node, which will be
382 obsoleted by the first data write
383 */
384 f->metadata = fn;
385 up(&f->sem);
386
387 jffs2_complete_reservation(c);
388
389 ret = jffs2_init_security(inode, dir_i);
390 if (ret) {
391 jffs2_clear_inode(inode);
392 return ret;
393 }
394 ret = jffs2_init_acl(inode, dir_i);
395 if (ret) {
396 jffs2_clear_inode(inode);
397 return ret;
398 }
399
400 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
401 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
402 if (ret) {
403 /* Eep. */
404 jffs2_clear_inode(inode);
405 return ret;
406 }
407
408 rd = jffs2_alloc_raw_dirent();
409 if (!rd) {
410 /* Argh. Now we treat it like a normal delete */
411 jffs2_complete_reservation(c);
412 jffs2_clear_inode(inode);
413 return -ENOMEM;
414 }
415
416 dir_f = JFFS2_INODE_INFO(dir_i);
417 down(&dir_f->sem);
418
419 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
420 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
421 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
422 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
423
424 rd->pino = cpu_to_je32(dir_i->i_ino);
425 rd->version = cpu_to_je32(++dir_f->highest_version);
426 rd->ino = cpu_to_je32(inode->i_ino);
427 rd->mctime = cpu_to_je32(get_seconds());
428 rd->nsize = namelen;
429 rd->type = DT_LNK;
430 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
431 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
432
433 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
434
435 if (IS_ERR(fd)) {
436 /* dirent failed to write. Delete the inode normally
437 as if it were the final unlink() */
438 jffs2_complete_reservation(c);
439 jffs2_free_raw_dirent(rd);
440 up(&dir_f->sem);
441 jffs2_clear_inode(inode);
442 return PTR_ERR(fd);
443 }
444
445 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
446
447 jffs2_free_raw_dirent(rd);
448
449 /* Link the fd into the inode's list, obsoleting an old
450 one if necessary. */
451 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
452
453 up(&dir_f->sem);
454 jffs2_complete_reservation(c);
455
456 d_instantiate(dentry, inode);
457 return 0;
458 }
459
460
461 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
462 {
463 struct jffs2_inode_info *f, *dir_f;
464 struct jffs2_sb_info *c;
465 struct inode *inode;
466 struct jffs2_raw_inode *ri;
467 struct jffs2_raw_dirent *rd;
468 struct jffs2_full_dnode *fn;
469 struct jffs2_full_dirent *fd;
470 int namelen;
471 uint32_t alloclen;
472 int ret;
473
474 mode |= S_IFDIR;
475
476 ri = jffs2_alloc_raw_inode();
477 if (!ri)
478 return -ENOMEM;
479
480 c = JFFS2_SB_INFO(dir_i->i_sb);
481
482 /* Try to reserve enough space for both node and dirent.
483 * Just the node will do for now, though
484 */
485 namelen = dentry->d_name.len;
486 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
487 JFFS2_SUMMARY_INODE_SIZE);
488
489 if (ret) {
490 jffs2_free_raw_inode(ri);
491 return ret;
492 }
493
494 inode = jffs2_new_inode(dir_i, mode, ri);
495
496 if (IS_ERR(inode)) {
497 jffs2_free_raw_inode(ri);
498 jffs2_complete_reservation(c);
499 return PTR_ERR(inode);
500 }
501
502 inode->i_op = &jffs2_dir_inode_operations;
503 inode->i_fop = &jffs2_dir_operations;
504 /* Directories get nlink 2 at start */
505 inode->i_nlink = 2;
506
507 f = JFFS2_INODE_INFO(inode);
508
509 ri->data_crc = cpu_to_je32(0);
510 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
511
512 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
513
514 jffs2_free_raw_inode(ri);
515
516 if (IS_ERR(fn)) {
517 /* Eeek. Wave bye bye */
518 up(&f->sem);
519 jffs2_complete_reservation(c);
520 jffs2_clear_inode(inode);
521 return PTR_ERR(fn);
522 }
523 /* No data here. Only a metadata node, which will be
524 obsoleted by the first data write
525 */
526 f->metadata = fn;
527 up(&f->sem);
528
529 jffs2_complete_reservation(c);
530
531 ret = jffs2_init_security(inode, dir_i);
532 if (ret) {
533 jffs2_clear_inode(inode);
534 return ret;
535 }
536 ret = jffs2_init_acl(inode, dir_i);
537 if (ret) {
538 jffs2_clear_inode(inode);
539 return ret;
540 }
541
542 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
543 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
544 if (ret) {
545 /* Eep. */
546 jffs2_clear_inode(inode);
547 return ret;
548 }
549
550 rd = jffs2_alloc_raw_dirent();
551 if (!rd) {
552 /* Argh. Now we treat it like a normal delete */
553 jffs2_complete_reservation(c);
554 jffs2_clear_inode(inode);
555 return -ENOMEM;
556 }
557
558 dir_f = JFFS2_INODE_INFO(dir_i);
559 down(&dir_f->sem);
560
561 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
562 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
563 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
564 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
565
566 rd->pino = cpu_to_je32(dir_i->i_ino);
567 rd->version = cpu_to_je32(++dir_f->highest_version);
568 rd->ino = cpu_to_je32(inode->i_ino);
569 rd->mctime = cpu_to_je32(get_seconds());
570 rd->nsize = namelen;
571 rd->type = DT_DIR;
572 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
573 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
574
575 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
576
577 if (IS_ERR(fd)) {
578 /* dirent failed to write. Delete the inode normally
579 as if it were the final unlink() */
580 jffs2_complete_reservation(c);
581 jffs2_free_raw_dirent(rd);
582 up(&dir_f->sem);
583 jffs2_clear_inode(inode);
584 return PTR_ERR(fd);
585 }
586
587 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
588 inc_nlink(dir_i);
589
590 jffs2_free_raw_dirent(rd);
591
592 /* Link the fd into the inode's list, obsoleting an old
593 one if necessary. */
594 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
595
596 up(&dir_f->sem);
597 jffs2_complete_reservation(c);
598
599 d_instantiate(dentry, inode);
600 return 0;
601 }
602
603 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
604 {
605 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
606 struct jffs2_full_dirent *fd;
607 int ret;
608
609 for (fd = f->dents ; fd; fd = fd->next) {
610 if (fd->ino)
611 return -ENOTEMPTY;
612 }
613 ret = jffs2_unlink(dir_i, dentry);
614 if (!ret)
615 drop_nlink(dir_i);
616 return ret;
617 }
618
619 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
620 {
621 struct jffs2_inode_info *f, *dir_f;
622 struct jffs2_sb_info *c;
623 struct inode *inode;
624 struct jffs2_raw_inode *ri;
625 struct jffs2_raw_dirent *rd;
626 struct jffs2_full_dnode *fn;
627 struct jffs2_full_dirent *fd;
628 int namelen;
629 union jffs2_device_node dev;
630 int devlen = 0;
631 uint32_t alloclen;
632 int ret;
633
634 if (!new_valid_dev(rdev))
635 return -EINVAL;
636
637 ri = jffs2_alloc_raw_inode();
638 if (!ri)
639 return -ENOMEM;
640
641 c = JFFS2_SB_INFO(dir_i->i_sb);
642
643 if (S_ISBLK(mode) || S_ISCHR(mode))
644 devlen = jffs2_encode_dev(&dev, rdev);
645
646 /* Try to reserve enough space for both node and dirent.
647 * Just the node will do for now, though
648 */
649 namelen = dentry->d_name.len;
650 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
651 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
652
653 if (ret) {
654 jffs2_free_raw_inode(ri);
655 return ret;
656 }
657
658 inode = jffs2_new_inode(dir_i, mode, ri);
659
660 if (IS_ERR(inode)) {
661 jffs2_free_raw_inode(ri);
662 jffs2_complete_reservation(c);
663 return PTR_ERR(inode);
664 }
665 inode->i_op = &jffs2_file_inode_operations;
666 init_special_inode(inode, inode->i_mode, rdev);
667
668 f = JFFS2_INODE_INFO(inode);
669
670 ri->dsize = ri->csize = cpu_to_je32(devlen);
671 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
672 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
673
674 ri->compr = JFFS2_COMPR_NONE;
675 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
676 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
677
678 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
679
680 jffs2_free_raw_inode(ri);
681
682 if (IS_ERR(fn)) {
683 /* Eeek. Wave bye bye */
684 up(&f->sem);
685 jffs2_complete_reservation(c);
686 jffs2_clear_inode(inode);
687 return PTR_ERR(fn);
688 }
689 /* No data here. Only a metadata node, which will be
690 obsoleted by the first data write
691 */
692 f->metadata = fn;
693 up(&f->sem);
694
695 jffs2_complete_reservation(c);
696
697 ret = jffs2_init_security(inode, dir_i);
698 if (ret) {
699 jffs2_clear_inode(inode);
700 return ret;
701 }
702 ret = jffs2_init_acl(inode, dir_i);
703 if (ret) {
704 jffs2_clear_inode(inode);
705 return ret;
706 }
707
708 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
709 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
710 if (ret) {
711 /* Eep. */
712 jffs2_clear_inode(inode);
713 return ret;
714 }
715
716 rd = jffs2_alloc_raw_dirent();
717 if (!rd) {
718 /* Argh. Now we treat it like a normal delete */
719 jffs2_complete_reservation(c);
720 jffs2_clear_inode(inode);
721 return -ENOMEM;
722 }
723
724 dir_f = JFFS2_INODE_INFO(dir_i);
725 down(&dir_f->sem);
726
727 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
728 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
729 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
730 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
731
732 rd->pino = cpu_to_je32(dir_i->i_ino);
733 rd->version = cpu_to_je32(++dir_f->highest_version);
734 rd->ino = cpu_to_je32(inode->i_ino);
735 rd->mctime = cpu_to_je32(get_seconds());
736 rd->nsize = namelen;
737
738 /* XXX: This is ugly. */
739 rd->type = (mode & S_IFMT) >> 12;
740
741 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
742 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
743
744 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
745
746 if (IS_ERR(fd)) {
747 /* dirent failed to write. Delete the inode normally
748 as if it were the final unlink() */
749 jffs2_complete_reservation(c);
750 jffs2_free_raw_dirent(rd);
751 up(&dir_f->sem);
752 jffs2_clear_inode(inode);
753 return PTR_ERR(fd);
754 }
755
756 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
757
758 jffs2_free_raw_dirent(rd);
759
760 /* Link the fd into the inode's list, obsoleting an old
761 one if necessary. */
762 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
763
764 up(&dir_f->sem);
765 jffs2_complete_reservation(c);
766
767 d_instantiate(dentry, inode);
768
769 return 0;
770 }
771
772 static 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 down(&victim_f->sem);
792 for (fd = victim_f->dents; fd; fd = fd->next) {
793 if (fd->ino) {
794 up(&victim_f->sem);
795 return -ENOTEMPTY;
796 }
797 }
798 up(&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 drop_nlink(new_dentry->d_inode);
824 /* Don't oops if the victim was a dirent pointing to an
825 inode which didn't exist. */
826 if (victim_f->inocache) {
827 down(&victim_f->sem);
828 victim_f->inocache->nlink--;
829 up(&victim_f->sem);
830 }
831 }
832
833 /* If it was a directory we moved, and there was no victim,
834 increase i_nlink on its new parent */
835 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
836 inc_nlink(new_dir_i);
837
838 /* Unlink the original */
839 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
840 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
841
842 /* We don't touch inode->i_nlink */
843
844 if (ret) {
845 /* Oh shit. We really ought to make a single node which can do both atomically */
846 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
847 down(&f->sem);
848 inc_nlink(old_dentry->d_inode);
849 if (f->inocache)
850 f->inocache->nlink++;
851 up(&f->sem);
852
853 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
854 /* Might as well let the VFS know */
855 d_instantiate(new_dentry, old_dentry->d_inode);
856 atomic_inc(&old_dentry->d_inode->i_count);
857 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
858 return ret;
859 }
860
861 if (S_ISDIR(old_dentry->d_inode->i_mode))
862 drop_nlink(old_dir_i);
863
864 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
865
866 return 0;
867 }
868
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