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Merge Linux 2.6.23
[deliverable/linux.git] / fs / jffs2 / dir.c
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 struct posix_acl *acl;
186 int ret;
187
188 ri = jffs2_alloc_raw_inode();
189 if (!ri)
190 return -ENOMEM;
191
192 c = JFFS2_SB_INFO(dir_i->i_sb);
193
194 D1(printk(KERN_DEBUG "jffs2_create()\n"));
195
196 inode = jffs2_new_inode(dir_i, mode, ri, &acl);
197
198 if (IS_ERR(inode)) {
199 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
200 jffs2_free_raw_inode(ri);
201 return PTR_ERR(inode);
202 }
203
204 inode->i_op = &jffs2_file_inode_operations;
205 inode->i_fop = &jffs2_file_operations;
206 inode->i_mapping->a_ops = &jffs2_file_address_operations;
207 inode->i_mapping->nrpages = 0;
208
209 f = JFFS2_INODE_INFO(inode);
210 dir_f = JFFS2_INODE_INFO(dir_i);
211
212 ret = jffs2_do_create(c, dir_f, f, ri,
213 dentry->d_name.name, dentry->d_name.len);
214
215 if (ret)
216 goto fail_acl;
217
218 ret = jffs2_init_security(inode, dir_i);
219 if (ret)
220 goto fail_acl;
221 ret = jffs2_init_acl(inode, acl);
222 if (ret)
223 goto fail;
224
225 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
226
227 jffs2_free_raw_inode(ri);
228 d_instantiate(dentry, inode);
229
230 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
231 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
232 return 0;
233
234 fail_acl:
235 posix_acl_release(acl);
236 fail:
237 make_bad_inode(inode);
238 iput(inode);
239 jffs2_free_raw_inode(ri);
240 return ret;
241 }
242
243 /***********************************************************************/
244
245
246 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
247 {
248 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
250 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
251 int ret;
252 uint32_t now = get_seconds();
253
254 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
255 dentry->d_name.len, dead_f, now);
256 if (dead_f->inocache)
257 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
258 if (!ret)
259 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
260 return ret;
261 }
262 /***********************************************************************/
263
264
265 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
266 {
267 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
268 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
269 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
270 int ret;
271 uint8_t type;
272 uint32_t now;
273
274 /* Don't let people make hard links to bad inodes. */
275 if (!f->inocache)
276 return -EIO;
277
278 if (S_ISDIR(old_dentry->d_inode->i_mode))
279 return -EPERM;
280
281 /* XXX: This is ugly */
282 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
283 if (!type) type = DT_REG;
284
285 now = get_seconds();
286 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
287
288 if (!ret) {
289 down(&f->sem);
290 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
291 up(&f->sem);
292 d_instantiate(dentry, old_dentry->d_inode);
293 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
294 atomic_inc(&old_dentry->d_inode->i_count);
295 }
296 return ret;
297 }
298
299 /***********************************************************************/
300
301 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
302 {
303 struct jffs2_inode_info *f, *dir_f;
304 struct jffs2_sb_info *c;
305 struct inode *inode;
306 struct jffs2_raw_inode *ri;
307 struct jffs2_raw_dirent *rd;
308 struct jffs2_full_dnode *fn;
309 struct jffs2_full_dirent *fd;
310 int namelen;
311 uint32_t alloclen;
312 struct posix_acl *acl;
313 int ret, targetlen = strlen(target);
314
315 /* FIXME: If you care. We'd need to use frags for the target
316 if it grows much more than this */
317 if (targetlen > 254)
318 return -EINVAL;
319
320 ri = jffs2_alloc_raw_inode();
321
322 if (!ri)
323 return -ENOMEM;
324
325 c = JFFS2_SB_INFO(dir_i->i_sb);
326
327 /* Try to reserve enough space for both node and dirent.
328 * Just the node will do for now, though
329 */
330 namelen = dentry->d_name.len;
331 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
332 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
333
334 if (ret) {
335 jffs2_free_raw_inode(ri);
336 return ret;
337 }
338
339 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri, &acl);
340
341 if (IS_ERR(inode)) {
342 jffs2_free_raw_inode(ri);
343 jffs2_complete_reservation(c);
344 return PTR_ERR(inode);
345 }
346
347 inode->i_op = &jffs2_symlink_inode_operations;
348
349 f = JFFS2_INODE_INFO(inode);
350
351 inode->i_size = targetlen;
352 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
353 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
354 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
355
356 ri->compr = JFFS2_COMPR_NONE;
357 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
358 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
359
360 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
361
362 jffs2_free_raw_inode(ri);
363
364 if (IS_ERR(fn)) {
365 /* Eeek. Wave bye bye */
366 up(&f->sem);
367 jffs2_complete_reservation(c);
368 jffs2_clear_inode(inode);
369 posix_acl_release(acl);
370 return PTR_ERR(fn);
371 }
372
373 /* We use f->target field to store the target path. */
374 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
375 if (!f->target) {
376 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
377 up(&f->sem);
378 jffs2_complete_reservation(c);
379 jffs2_clear_inode(inode);
380 posix_acl_release(acl);
381 return -ENOMEM;
382 }
383
384 memcpy(f->target, target, targetlen + 1);
385 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
386
387 /* No data here. Only a metadata node, which will be
388 obsoleted by the first data write
389 */
390 f->metadata = fn;
391 up(&f->sem);
392
393 jffs2_complete_reservation(c);
394
395 ret = jffs2_init_security(inode, dir_i);
396 if (ret) {
397 jffs2_clear_inode(inode);
398 posix_acl_release(acl);
399 return ret;
400 }
401 ret = jffs2_init_acl(inode, acl);
402 if (ret) {
403 jffs2_clear_inode(inode);
404 return ret;
405 }
406
407 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
408 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
409 if (ret) {
410 /* Eep. */
411 jffs2_clear_inode(inode);
412 return ret;
413 }
414
415 rd = jffs2_alloc_raw_dirent();
416 if (!rd) {
417 /* Argh. Now we treat it like a normal delete */
418 jffs2_complete_reservation(c);
419 jffs2_clear_inode(inode);
420 return -ENOMEM;
421 }
422
423 dir_f = JFFS2_INODE_INFO(dir_i);
424 down(&dir_f->sem);
425
426 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
427 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
428 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
429 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
430
431 rd->pino = cpu_to_je32(dir_i->i_ino);
432 rd->version = cpu_to_je32(++dir_f->highest_version);
433 rd->ino = cpu_to_je32(inode->i_ino);
434 rd->mctime = cpu_to_je32(get_seconds());
435 rd->nsize = namelen;
436 rd->type = DT_LNK;
437 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
438 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
439
440 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
441
442 if (IS_ERR(fd)) {
443 /* dirent failed to write. Delete the inode normally
444 as if it were the final unlink() */
445 jffs2_complete_reservation(c);
446 jffs2_free_raw_dirent(rd);
447 up(&dir_f->sem);
448 jffs2_clear_inode(inode);
449 return PTR_ERR(fd);
450 }
451
452 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
453
454 jffs2_free_raw_dirent(rd);
455
456 /* Link the fd into the inode's list, obsoleting an old
457 one if necessary. */
458 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
459
460 up(&dir_f->sem);
461 jffs2_complete_reservation(c);
462
463 d_instantiate(dentry, inode);
464 return 0;
465 }
466
467
468 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
469 {
470 struct jffs2_inode_info *f, *dir_f;
471 struct jffs2_sb_info *c;
472 struct inode *inode;
473 struct jffs2_raw_inode *ri;
474 struct jffs2_raw_dirent *rd;
475 struct jffs2_full_dnode *fn;
476 struct jffs2_full_dirent *fd;
477 int namelen;
478 uint32_t alloclen;
479 struct posix_acl *acl;
480 int ret;
481
482 mode |= S_IFDIR;
483
484 ri = jffs2_alloc_raw_inode();
485 if (!ri)
486 return -ENOMEM;
487
488 c = JFFS2_SB_INFO(dir_i->i_sb);
489
490 /* Try to reserve enough space for both node and dirent.
491 * Just the node will do for now, though
492 */
493 namelen = dentry->d_name.len;
494 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
495 JFFS2_SUMMARY_INODE_SIZE);
496
497 if (ret) {
498 jffs2_free_raw_inode(ri);
499 return ret;
500 }
501
502 inode = jffs2_new_inode(dir_i, mode, ri, &acl);
503
504 if (IS_ERR(inode)) {
505 jffs2_free_raw_inode(ri);
506 jffs2_complete_reservation(c);
507 return PTR_ERR(inode);
508 }
509
510 inode->i_op = &jffs2_dir_inode_operations;
511 inode->i_fop = &jffs2_dir_operations;
512 /* Directories get nlink 2 at start */
513 inode->i_nlink = 2;
514
515 f = JFFS2_INODE_INFO(inode);
516
517 ri->data_crc = cpu_to_je32(0);
518 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
519
520 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
521
522 jffs2_free_raw_inode(ri);
523
524 if (IS_ERR(fn)) {
525 /* Eeek. Wave bye bye */
526 up(&f->sem);
527 jffs2_complete_reservation(c);
528 jffs2_clear_inode(inode);
529 posix_acl_release(acl);
530 return PTR_ERR(fn);
531 }
532 /* No data here. Only a metadata node, which will be
533 obsoleted by the first data write
534 */
535 f->metadata = fn;
536 up(&f->sem);
537
538 jffs2_complete_reservation(c);
539
540 ret = jffs2_init_security(inode, dir_i);
541 if (ret) {
542 jffs2_clear_inode(inode);
543 posix_acl_release(acl);
544 return ret;
545 }
546 ret = jffs2_init_acl(inode, acl);
547 if (ret) {
548 jffs2_clear_inode(inode);
549 return ret;
550 }
551
552 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
553 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
554 if (ret) {
555 /* Eep. */
556 jffs2_clear_inode(inode);
557 return ret;
558 }
559
560 rd = jffs2_alloc_raw_dirent();
561 if (!rd) {
562 /* Argh. Now we treat it like a normal delete */
563 jffs2_complete_reservation(c);
564 jffs2_clear_inode(inode);
565 return -ENOMEM;
566 }
567
568 dir_f = JFFS2_INODE_INFO(dir_i);
569 down(&dir_f->sem);
570
571 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
572 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
573 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
574 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
575
576 rd->pino = cpu_to_je32(dir_i->i_ino);
577 rd->version = cpu_to_je32(++dir_f->highest_version);
578 rd->ino = cpu_to_je32(inode->i_ino);
579 rd->mctime = cpu_to_je32(get_seconds());
580 rd->nsize = namelen;
581 rd->type = DT_DIR;
582 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
583 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
584
585 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
586
587 if (IS_ERR(fd)) {
588 /* dirent failed to write. Delete the inode normally
589 as if it were the final unlink() */
590 jffs2_complete_reservation(c);
591 jffs2_free_raw_dirent(rd);
592 up(&dir_f->sem);
593 jffs2_clear_inode(inode);
594 return PTR_ERR(fd);
595 }
596
597 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
598 inc_nlink(dir_i);
599
600 jffs2_free_raw_dirent(rd);
601
602 /* Link the fd into the inode's list, obsoleting an old
603 one if necessary. */
604 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
605
606 up(&dir_f->sem);
607 jffs2_complete_reservation(c);
608
609 d_instantiate(dentry, inode);
610 return 0;
611 }
612
613 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
614 {
615 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
616 struct jffs2_full_dirent *fd;
617 int ret;
618
619 for (fd = f->dents ; fd; fd = fd->next) {
620 if (fd->ino)
621 return -ENOTEMPTY;
622 }
623 ret = jffs2_unlink(dir_i, dentry);
624 if (!ret)
625 drop_nlink(dir_i);
626 return ret;
627 }
628
629 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
630 {
631 struct jffs2_inode_info *f, *dir_f;
632 struct jffs2_sb_info *c;
633 struct inode *inode;
634 struct jffs2_raw_inode *ri;
635 struct jffs2_raw_dirent *rd;
636 struct jffs2_full_dnode *fn;
637 struct jffs2_full_dirent *fd;
638 int namelen;
639 union jffs2_device_node dev;
640 int devlen = 0;
641 uint32_t alloclen;
642 struct posix_acl *acl;
643 int ret;
644
645 if (!new_valid_dev(rdev))
646 return -EINVAL;
647
648 ri = jffs2_alloc_raw_inode();
649 if (!ri)
650 return -ENOMEM;
651
652 c = JFFS2_SB_INFO(dir_i->i_sb);
653
654 if (S_ISBLK(mode) || S_ISCHR(mode))
655 devlen = jffs2_encode_dev(&dev, rdev);
656
657 /* Try to reserve enough space for both node and dirent.
658 * Just the node will do for now, though
659 */
660 namelen = dentry->d_name.len;
661 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
662 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
663
664 if (ret) {
665 jffs2_free_raw_inode(ri);
666 return ret;
667 }
668
669 inode = jffs2_new_inode(dir_i, mode, ri, &acl);
670
671 if (IS_ERR(inode)) {
672 jffs2_free_raw_inode(ri);
673 jffs2_complete_reservation(c);
674 return PTR_ERR(inode);
675 }
676 inode->i_op = &jffs2_file_inode_operations;
677 init_special_inode(inode, inode->i_mode, rdev);
678
679 f = JFFS2_INODE_INFO(inode);
680
681 ri->dsize = ri->csize = cpu_to_je32(devlen);
682 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
683 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
684
685 ri->compr = JFFS2_COMPR_NONE;
686 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
687 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
688
689 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
690
691 jffs2_free_raw_inode(ri);
692
693 if (IS_ERR(fn)) {
694 /* Eeek. Wave bye bye */
695 up(&f->sem);
696 jffs2_complete_reservation(c);
697 jffs2_clear_inode(inode);
698 posix_acl_release(acl);
699 return PTR_ERR(fn);
700 }
701 /* No data here. Only a metadata node, which will be
702 obsoleted by the first data write
703 */
704 f->metadata = fn;
705 up(&f->sem);
706
707 jffs2_complete_reservation(c);
708
709 ret = jffs2_init_security(inode, dir_i);
710 if (ret) {
711 jffs2_clear_inode(inode);
712 posix_acl_release(acl);
713 return ret;
714 }
715 ret = jffs2_init_acl(inode, acl);
716 if (ret) {
717 jffs2_clear_inode(inode);
718 return ret;
719 }
720
721 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
722 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
723 if (ret) {
724 /* Eep. */
725 jffs2_clear_inode(inode);
726 return ret;
727 }
728
729 rd = jffs2_alloc_raw_dirent();
730 if (!rd) {
731 /* Argh. Now we treat it like a normal delete */
732 jffs2_complete_reservation(c);
733 jffs2_clear_inode(inode);
734 return -ENOMEM;
735 }
736
737 dir_f = JFFS2_INODE_INFO(dir_i);
738 down(&dir_f->sem);
739
740 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
741 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
742 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
743 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
744
745 rd->pino = cpu_to_je32(dir_i->i_ino);
746 rd->version = cpu_to_je32(++dir_f->highest_version);
747 rd->ino = cpu_to_je32(inode->i_ino);
748 rd->mctime = cpu_to_je32(get_seconds());
749 rd->nsize = namelen;
750
751 /* XXX: This is ugly. */
752 rd->type = (mode & S_IFMT) >> 12;
753
754 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
755 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
756
757 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
758
759 if (IS_ERR(fd)) {
760 /* dirent failed to write. Delete the inode normally
761 as if it were the final unlink() */
762 jffs2_complete_reservation(c);
763 jffs2_free_raw_dirent(rd);
764 up(&dir_f->sem);
765 jffs2_clear_inode(inode);
766 return PTR_ERR(fd);
767 }
768
769 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
770
771 jffs2_free_raw_dirent(rd);
772
773 /* Link the fd into the inode's list, obsoleting an old
774 one if necessary. */
775 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
776
777 up(&dir_f->sem);
778 jffs2_complete_reservation(c);
779
780 d_instantiate(dentry, inode);
781
782 return 0;
783 }
784
785 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
786 struct inode *new_dir_i, struct dentry *new_dentry)
787 {
788 int ret;
789 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
790 struct jffs2_inode_info *victim_f = NULL;
791 uint8_t type;
792 uint32_t now;
793
794 /* The VFS will check for us and prevent trying to rename a
795 * file over a directory and vice versa, but if it's a directory,
796 * the VFS can't check whether the victim is empty. The filesystem
797 * needs to do that for itself.
798 */
799 if (new_dentry->d_inode) {
800 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
801 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
802 struct jffs2_full_dirent *fd;
803
804 down(&victim_f->sem);
805 for (fd = victim_f->dents; fd; fd = fd->next) {
806 if (fd->ino) {
807 up(&victim_f->sem);
808 return -ENOTEMPTY;
809 }
810 }
811 up(&victim_f->sem);
812 }
813 }
814
815 /* XXX: We probably ought to alloc enough space for
816 both nodes at the same time. Writing the new link,
817 then getting -ENOSPC, is quite bad :)
818 */
819
820 /* Make a hard link */
821
822 /* XXX: This is ugly */
823 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
824 if (!type) type = DT_REG;
825
826 now = get_seconds();
827 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
828 old_dentry->d_inode->i_ino, type,
829 new_dentry->d_name.name, new_dentry->d_name.len, now);
830
831 if (ret)
832 return ret;
833
834 if (victim_f) {
835 /* There was a victim. Kill it off nicely */
836 drop_nlink(new_dentry->d_inode);
837 /* Don't oops if the victim was a dirent pointing to an
838 inode which didn't exist. */
839 if (victim_f->inocache) {
840 down(&victim_f->sem);
841 victim_f->inocache->nlink--;
842 up(&victim_f->sem);
843 }
844 }
845
846 /* If it was a directory we moved, and there was no victim,
847 increase i_nlink on its new parent */
848 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
849 inc_nlink(new_dir_i);
850
851 /* Unlink the original */
852 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
853 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
854
855 /* We don't touch inode->i_nlink */
856
857 if (ret) {
858 /* Oh shit. We really ought to make a single node which can do both atomically */
859 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
860 down(&f->sem);
861 inc_nlink(old_dentry->d_inode);
862 if (f->inocache)
863 f->inocache->nlink++;
864 up(&f->sem);
865
866 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
867 /* Might as well let the VFS know */
868 d_instantiate(new_dentry, old_dentry->d_inode);
869 atomic_inc(&old_dentry->d_inode->i_count);
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
Linux kernel - Deliverables
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