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kgdb: Kconfig fix
[linux-2.6/openmoko-kernel/knife-kernel.git] / fs / jffs2 / dir.c
blobf948f7e6ec8202ab901d83b7fd5c62fd6ec41b27
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 = jffs2_iget(dir_i->i_sb, ino);
105 if (IS_ERR(inode)) {
106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107 return ERR_CAST(inode);
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 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 d_instantiate(dentry, inode);
220
221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
223 return 0;
224
225 fail:
226 make_bad_inode(inode);
227 iput(inode);
228 jffs2_free_raw_inode(ri);
229 return ret;
230 }
231
232 /***********************************************************************/
233
234
235 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
236 {
237 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
238 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
239 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
240 int ret;
241 uint32_t now = get_seconds();
242
243 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
244 dentry->d_name.len, dead_f, now);
245 if (dead_f->inocache)
246 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
247 if (!ret)
248 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
249 return ret;
250 }
251 /***********************************************************************/
252
253
254 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
255 {
256 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
257 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
258 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
259 int ret;
260 uint8_t type;
261 uint32_t now;
262
263 /* Don't let people make hard links to bad inodes. */
264 if (!f->inocache)
265 return -EIO;
266
267 if (S_ISDIR(old_dentry->d_inode->i_mode))
268 return -EPERM;
269
270 /* XXX: This is ugly */
271 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
272 if (!type) type = DT_REG;
273
274 now = get_seconds();
275 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
276
277 if (!ret) {
278 down(&f->sem);
279 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
280 up(&f->sem);
281 d_instantiate(dentry, old_dentry->d_inode);
282 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
283 atomic_inc(&old_dentry->d_inode->i_count);
284 }
285 return ret;
286 }
287
288 /***********************************************************************/
289
290 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
291 {
292 struct jffs2_inode_info *f, *dir_f;
293 struct jffs2_sb_info *c;
294 struct inode *inode;
295 struct jffs2_raw_inode *ri;
296 struct jffs2_raw_dirent *rd;
297 struct jffs2_full_dnode *fn;
298 struct jffs2_full_dirent *fd;
299 int namelen;
300 uint32_t alloclen;
301 int ret, targetlen = strlen(target);
302
303 /* FIXME: If you care. We'd need to use frags for the target
304 if it grows much more than this */
305 if (targetlen > 254)
306 return -EINVAL;
307
308 ri = jffs2_alloc_raw_inode();
309
310 if (!ri)
311 return -ENOMEM;
312
313 c = JFFS2_SB_INFO(dir_i->i_sb);
314
315 /* Try to reserve enough space for both node and dirent.
316 * Just the node will do for now, though
317 */
318 namelen = dentry->d_name.len;
319 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
320 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
321
322 if (ret) {
323 jffs2_free_raw_inode(ri);
324 return ret;
325 }
326
327 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
328
329 if (IS_ERR(inode)) {
330 jffs2_free_raw_inode(ri);
331 jffs2_complete_reservation(c);
332 return PTR_ERR(inode);
333 }
334
335 inode->i_op = &jffs2_symlink_inode_operations;
336
337 f = JFFS2_INODE_INFO(inode);
338
339 inode->i_size = targetlen;
340 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
341 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
342 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
343
344 ri->compr = JFFS2_COMPR_NONE;
345 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
346 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
347
348 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
349
350 jffs2_free_raw_inode(ri);
351
352 if (IS_ERR(fn)) {
353 /* Eeek. Wave bye bye */
354 up(&f->sem);
355 jffs2_complete_reservation(c);
356 jffs2_clear_inode(inode);
357 return PTR_ERR(fn);
358 }
359
360 /* We use f->target field to store the target path. */
361 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
362 if (!f->target) {
363 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
364 up(&f->sem);
365 jffs2_complete_reservation(c);
366 jffs2_clear_inode(inode);
367 return -ENOMEM;
368 }
369
370 memcpy(f->target, target, targetlen + 1);
371 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
372
373 /* No data here. Only a metadata node, which will be
374 obsoleted by the first data write
375 */
376 f->metadata = fn;
377 up(&f->sem);
378
379 jffs2_complete_reservation(c);
380
381 ret = jffs2_init_security(inode, dir_i);
382 if (ret) {
383 jffs2_clear_inode(inode);
384 return ret;
385 }
386 ret = jffs2_init_acl_post(inode);
387 if (ret) {
388 jffs2_clear_inode(inode);
389 return ret;
390 }
391
392 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
393 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
394 if (ret) {
395 /* Eep. */
396 jffs2_clear_inode(inode);
397 return ret;
398 }
399
400 rd = jffs2_alloc_raw_dirent();
401 if (!rd) {
402 /* Argh. Now we treat it like a normal delete */
403 jffs2_complete_reservation(c);
404 jffs2_clear_inode(inode);
405 return -ENOMEM;
406 }
407
408 dir_f = JFFS2_INODE_INFO(dir_i);
409 down(&dir_f->sem);
410
411 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
412 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
413 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
414 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
415
416 rd->pino = cpu_to_je32(dir_i->i_ino);
417 rd->version = cpu_to_je32(++dir_f->highest_version);
418 rd->ino = cpu_to_je32(inode->i_ino);
419 rd->mctime = cpu_to_je32(get_seconds());
420 rd->nsize = namelen;
421 rd->type = DT_LNK;
422 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
423 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
424
425 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
426
427 if (IS_ERR(fd)) {
428 /* dirent failed to write. Delete the inode normally
429 as if it were the final unlink() */
430 jffs2_complete_reservation(c);
431 jffs2_free_raw_dirent(rd);
432 up(&dir_f->sem);
433 jffs2_clear_inode(inode);
434 return PTR_ERR(fd);
435 }
436
437 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
438
439 jffs2_free_raw_dirent(rd);
440
441 /* Link the fd into the inode's list, obsoleting an old
442 one if necessary. */
443 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
444
445 up(&dir_f->sem);
446 jffs2_complete_reservation(c);
447
448 d_instantiate(dentry, inode);
449 return 0;
450 }
451
452
453 static 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 /* Directories get nlink 2 at start */
497 inode->i_nlink = 2;
498
499 f = JFFS2_INODE_INFO(inode);
500
501 ri->data_crc = cpu_to_je32(0);
502 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
503
504 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
505
506 jffs2_free_raw_inode(ri);
507
508 if (IS_ERR(fn)) {
509 /* Eeek. Wave bye bye */
510 up(&f->sem);
511 jffs2_complete_reservation(c);
512 jffs2_clear_inode(inode);
513 return PTR_ERR(fn);
514 }
515 /* No data here. Only a metadata node, which will be
516 obsoleted by the first data write
517 */
518 f->metadata = fn;
519 up(&f->sem);
520
521 jffs2_complete_reservation(c);
522
523 ret = jffs2_init_security(inode, dir_i);
524 if (ret) {
525 jffs2_clear_inode(inode);
526 return ret;
527 }
528 ret = jffs2_init_acl_post(inode);
529 if (ret) {
530 jffs2_clear_inode(inode);
531 return ret;
532 }
533
534 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
535 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
536 if (ret) {
537 /* Eep. */
538 jffs2_clear_inode(inode);
539 return ret;
540 }
541
542 rd = jffs2_alloc_raw_dirent();
543 if (!rd) {
544 /* Argh. Now we treat it like a normal delete */
545 jffs2_complete_reservation(c);
546 jffs2_clear_inode(inode);
547 return -ENOMEM;
548 }
549
550 dir_f = JFFS2_INODE_INFO(dir_i);
551 down(&dir_f->sem);
552
553 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
554 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
555 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
556 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
557
558 rd->pino = cpu_to_je32(dir_i->i_ino);
559 rd->version = cpu_to_je32(++dir_f->highest_version);
560 rd->ino = cpu_to_je32(inode->i_ino);
561 rd->mctime = cpu_to_je32(get_seconds());
562 rd->nsize = namelen;
563 rd->type = DT_DIR;
564 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
565 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
566
567 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
568
569 if (IS_ERR(fd)) {
570 /* dirent failed to write. Delete the inode normally
571 as if it were the final unlink() */
572 jffs2_complete_reservation(c);
573 jffs2_free_raw_dirent(rd);
574 up(&dir_f->sem);
575 jffs2_clear_inode(inode);
576 return PTR_ERR(fd);
577 }
578
579 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
580 inc_nlink(dir_i);
581
582 jffs2_free_raw_dirent(rd);
583
584 /* Link the fd into the inode's list, obsoleting an old
585 one if necessary. */
586 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
587
588 up(&dir_f->sem);
589 jffs2_complete_reservation(c);
590
591 d_instantiate(dentry, inode);
592 return 0;
593 }
594
595 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
596 {
597 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
598 struct jffs2_full_dirent *fd;
599 int ret;
600
601 for (fd = f->dents ; fd; fd = fd->next) {
602 if (fd->ino)
603 return -ENOTEMPTY;
604 }
605 ret = jffs2_unlink(dir_i, dentry);
606 if (!ret)
607 drop_nlink(dir_i);
608 return ret;
609 }
610
611 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
612 {
613 struct jffs2_inode_info *f, *dir_f;
614 struct jffs2_sb_info *c;
615 struct inode *inode;
616 struct jffs2_raw_inode *ri;
617 struct jffs2_raw_dirent *rd;
618 struct jffs2_full_dnode *fn;
619 struct jffs2_full_dirent *fd;
620 int namelen;
621 union jffs2_device_node dev;
622 int devlen = 0;
623 uint32_t alloclen;
624 int ret;
625
626 if (!new_valid_dev(rdev))
627 return -EINVAL;
628
629 ri = jffs2_alloc_raw_inode();
630 if (!ri)
631 return -ENOMEM;
632
633 c = JFFS2_SB_INFO(dir_i->i_sb);
634
635 if (S_ISBLK(mode) || S_ISCHR(mode))
636 devlen = jffs2_encode_dev(&dev, rdev);
637
638 /* Try to reserve enough space for both node and dirent.
639 * Just the node will do for now, though
640 */
641 namelen = dentry->d_name.len;
642 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
643 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
644
645 if (ret) {
646 jffs2_free_raw_inode(ri);
647 return ret;
648 }
649
650 inode = jffs2_new_inode(dir_i, mode, ri);
651
652 if (IS_ERR(inode)) {
653 jffs2_free_raw_inode(ri);
654 jffs2_complete_reservation(c);
655 return PTR_ERR(inode);
656 }
657 inode->i_op = &jffs2_file_inode_operations;
658 init_special_inode(inode, inode->i_mode, rdev);
659
660 f = JFFS2_INODE_INFO(inode);
661
662 ri->dsize = ri->csize = cpu_to_je32(devlen);
663 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
664 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
665
666 ri->compr = JFFS2_COMPR_NONE;
667 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
668 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
669
670 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
671
672 jffs2_free_raw_inode(ri);
673
674 if (IS_ERR(fn)) {
675 /* Eeek. Wave bye bye */
676 up(&f->sem);
677 jffs2_complete_reservation(c);
678 jffs2_clear_inode(inode);
679 return PTR_ERR(fn);
680 }
681 /* No data here. Only a metadata node, which will be
682 obsoleted by the first data write
683 */
684 f->metadata = fn;
685 up(&f->sem);
686
687 jffs2_complete_reservation(c);
688
689 ret = jffs2_init_security(inode, dir_i);
690 if (ret) {
691 jffs2_clear_inode(inode);
692 return ret;
693 }
694 ret = jffs2_init_acl_post(inode);
695 if (ret) {
696 jffs2_clear_inode(inode);
697 return ret;
698 }
699
700 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
701 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
702 if (ret) {
703 /* Eep. */
704 jffs2_clear_inode(inode);
705 return ret;
706 }
707
708 rd = jffs2_alloc_raw_dirent();
709 if (!rd) {
710 /* Argh. Now we treat it like a normal delete */
711 jffs2_complete_reservation(c);
712 jffs2_clear_inode(inode);
713 return -ENOMEM;
714 }
715
716 dir_f = JFFS2_INODE_INFO(dir_i);
717 down(&dir_f->sem);
718
719 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
720 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
721 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
722 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
723
724 rd->pino = cpu_to_je32(dir_i->i_ino);
725 rd->version = cpu_to_je32(++dir_f->highest_version);
726 rd->ino = cpu_to_je32(inode->i_ino);
727 rd->mctime = cpu_to_je32(get_seconds());
728 rd->nsize = namelen;
729
730 /* XXX: This is ugly. */
731 rd->type = (mode & S_IFMT) >> 12;
732
733 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
734 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
735
736 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
737
738 if (IS_ERR(fd)) {
739 /* dirent failed to write. Delete the inode normally
740 as if it were the final unlink() */
741 jffs2_complete_reservation(c);
742 jffs2_free_raw_dirent(rd);
743 up(&dir_f->sem);
744 jffs2_clear_inode(inode);
745 return PTR_ERR(fd);
746 }
747
748 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
749
750 jffs2_free_raw_dirent(rd);
751
752 /* Link the fd into the inode's list, obsoleting an old
753 one if necessary. */
754 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
755
756 up(&dir_f->sem);
757 jffs2_complete_reservation(c);
758
759 d_instantiate(dentry, inode);
760
761 return 0;
762 }
763
764 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
765 struct inode *new_dir_i, struct dentry *new_dentry)
766 {
767 int ret;
768 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
769 struct jffs2_inode_info *victim_f = NULL;
770 uint8_t type;
771 uint32_t now;
772
773 /* The VFS will check for us and prevent trying to rename a
774 * file over a directory and vice versa, but if it's a directory,
775 * the VFS can't check whether the victim is empty. The filesystem
776 * needs to do that for itself.
777 */
778 if (new_dentry->d_inode) {
779 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
780 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
781 struct jffs2_full_dirent *fd;
782
783 down(&victim_f->sem);
784 for (fd = victim_f->dents; fd; fd = fd->next) {
785 if (fd->ino) {
786 up(&victim_f->sem);
787 return -ENOTEMPTY;
788 }
789 }
790 up(&victim_f->sem);
791 }
792 }
793
794 /* XXX: We probably ought to alloc enough space for
795 both nodes at the same time. Writing the new link,
796 then getting -ENOSPC, is quite bad :)
797 */
798
799 /* Make a hard link */
800
801 /* XXX: This is ugly */
802 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
803 if (!type) type = DT_REG;
804
805 now = get_seconds();
806 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
807 old_dentry->d_inode->i_ino, type,
808 new_dentry->d_name.name, new_dentry->d_name.len, now);
809
810 if (ret)
811 return ret;
812
813 if (victim_f) {
814 /* There was a victim. Kill it off nicely */
815 drop_nlink(new_dentry->d_inode);
816 /* Don't oops if the victim was a dirent pointing to an
817 inode which didn't exist. */
818 if (victim_f->inocache) {
819 down(&victim_f->sem);
820 victim_f->inocache->nlink--;
821 up(&victim_f->sem);
822 }
823 }
824
825 /* If it was a directory we moved, and there was no victim,
826 increase i_nlink on its new parent */
827 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
828 inc_nlink(new_dir_i);
829
830 /* Unlink the original */
831 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
832 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
833
834 /* We don't touch inode->i_nlink */
835
836 if (ret) {
837 /* Oh shit. We really ought to make a single node which can do both atomically */
838 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
839 down(&f->sem);
840 inc_nlink(old_dentry->d_inode);
841 if (f->inocache)
842 f->inocache->nlink++;
843 up(&f->sem);
844
845 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
846 /* Might as well let the VFS know */
847 d_instantiate(new_dentry, old_dentry->d_inode);
848 atomic_inc(&old_dentry->d_inode->i_count);
849 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
850 return ret;
851 }
852
853 if (S_ISDIR(old_dentry->d_inode->i_mode))
854 drop_nlink(old_dir_i);
855
856 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
857
858 return 0;
859 }
860
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