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drm/i915: unbind unmappable objects on fault/pin
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / jffs2 / dir.c
blob79121aa5858b8a4aa02861ba57cf17d9a8dfe13b
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
23 static int jffs2_readdir (struct file *, void *, filldir_t);
24
25 static int jffs2_create (struct inode *,struct dentry *,int,
26 struct nameidata *);
27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
28 struct nameidata *);
29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
30 static int jffs2_unlink (struct inode *,struct dentry *);
31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
32 static int jffs2_mkdir (struct inode *,struct dentry *,int);
33 static int jffs2_rmdir (struct inode *,struct dentry *);
34 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
35 static int jffs2_rename (struct inode *, struct dentry *,
36 struct inode *, struct dentry *);
37
38 const 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
48 const 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 .check_acl = jffs2_check_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 */
74 static 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_sb_info *c;
79 struct jffs2_full_dirent *fd = NULL, *fd_list;
80 uint32_t ino = 0;
81 struct inode *inode = NULL;
82
83 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
84
85 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
86 return ERR_PTR(-ENAMETOOLONG);
87
88 dir_f = JFFS2_INODE_INFO(dir_i);
89 c = JFFS2_SB_INFO(dir_i->i_sb);
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 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
109 return ERR_CAST(inode);
110 }
111 }
112
113 return d_splice_alias(inode, target);
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 mutex_lock(&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 mutex_unlock(&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 /* jffs2_do_create() will want to lock it, _after_ reserving
212 space and taking c-alloc_sem. If we keep it locked here,
213 lockdep gets unhappy (although it's a false positive;
214 nothing else will be looking at this inode yet so there's
215 no chance of AB-BA deadlock involving its f->sem). */
216 mutex_unlock(&f->sem);
217
218 ret = jffs2_do_create(c, dir_f, f, ri,
219 dentry->d_name.name, dentry->d_name.len);
220 if (ret)
221 goto fail;
222
223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
224
225 jffs2_free_raw_inode(ri);
226
227 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
228 inode->i_ino, inode->i_mode, inode->i_nlink,
229 f->inocache->pino_nlink, inode->i_mapping->nrpages));
230
231 d_instantiate(dentry, inode);
232 unlock_new_inode(inode);
233 return 0;
234
235 fail:
236 iget_failed(inode);
237 jffs2_free_raw_inode(ri);
238 return ret;
239 }
240
241 /***********************************************************************/
242
243
244 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
245 {
246 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
247 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
248 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
249 int ret;
250 uint32_t now = get_seconds();
251
252 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
253 dentry->d_name.len, dead_f, now);
254 if (dead_f->inocache)
255 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
256 if (!ret)
257 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
258 return ret;
259 }
260 /***********************************************************************/
261
262
263 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
264 {
265 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
266 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
267 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
268 int ret;
269 uint8_t type;
270 uint32_t now;
271
272 /* Don't let people make hard links to bad inodes. */
273 if (!f->inocache)
274 return -EIO;
275
276 if (S_ISDIR(old_dentry->d_inode->i_mode))
277 return -EPERM;
278
279 /* XXX: This is ugly */
280 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
281 if (!type) type = DT_REG;
282
283 now = get_seconds();
284 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
285
286 if (!ret) {
287 mutex_lock(&f->sem);
288 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
289 mutex_unlock(&f->sem);
290 d_instantiate(dentry, old_dentry->d_inode);
291 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
292 ihold(old_dentry->d_inode);
293 }
294 return ret;
295 }
296
297 /***********************************************************************/
298
299 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
300 {
301 struct jffs2_inode_info *f, *dir_f;
302 struct jffs2_sb_info *c;
303 struct inode *inode;
304 struct jffs2_raw_inode *ri;
305 struct jffs2_raw_dirent *rd;
306 struct jffs2_full_dnode *fn;
307 struct jffs2_full_dirent *fd;
308 int namelen;
309 uint32_t alloclen;
310 int ret, targetlen = strlen(target);
311
312 /* FIXME: If you care. We'd need to use frags for the target
313 if it grows much more than this */
314 if (targetlen > 254)
315 return -ENAMETOOLONG;
316
317 ri = jffs2_alloc_raw_inode();
318
319 if (!ri)
320 return -ENOMEM;
321
322 c = JFFS2_SB_INFO(dir_i->i_sb);
323
324 /* Try to reserve enough space for both node and dirent.
325 * Just the node will do for now, though
326 */
327 namelen = dentry->d_name.len;
328 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
329 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
330
331 if (ret) {
332 jffs2_free_raw_inode(ri);
333 return ret;
334 }
335
336 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
337
338 if (IS_ERR(inode)) {
339 jffs2_free_raw_inode(ri);
340 jffs2_complete_reservation(c);
341 return PTR_ERR(inode);
342 }
343
344 inode->i_op = &jffs2_symlink_inode_operations;
345
346 f = JFFS2_INODE_INFO(inode);
347
348 inode->i_size = targetlen;
349 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
350 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
351 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
352
353 ri->compr = JFFS2_COMPR_NONE;
354 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
355 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
356
357 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
358
359 jffs2_free_raw_inode(ri);
360
361 if (IS_ERR(fn)) {
362 /* Eeek. Wave bye bye */
363 mutex_unlock(&f->sem);
364 jffs2_complete_reservation(c);
365 ret = PTR_ERR(fn);
366 goto fail;
367 }
368
369 /* We use f->target field to store the target path. */
370 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
371 if (!f->target) {
372 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
373 mutex_unlock(&f->sem);
374 jffs2_complete_reservation(c);
375 ret = -ENOMEM;
376 goto fail;
377 }
378
379 memcpy(f->target, target, targetlen + 1);
380 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
381
382 /* No data here. Only a metadata node, which will be
383 obsoleted by the first data write
384 */
385 f->metadata = fn;
386 mutex_unlock(&f->sem);
387
388 jffs2_complete_reservation(c);
389
390 ret = jffs2_init_security(inode, dir_i);
391 if (ret)
392 goto fail;
393
394 ret = jffs2_init_acl_post(inode);
395 if (ret)
396 goto fail;
397
398 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
399 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
400 if (ret)
401 goto fail;
402
403 rd = jffs2_alloc_raw_dirent();
404 if (!rd) {
405 /* Argh. Now we treat it like a normal delete */
406 jffs2_complete_reservation(c);
407 ret = -ENOMEM;
408 goto fail;
409 }
410
411 dir_f = JFFS2_INODE_INFO(dir_i);
412 mutex_lock(&dir_f->sem);
413
414 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
415 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
416 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
417 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
418
419 rd->pino = cpu_to_je32(dir_i->i_ino);
420 rd->version = cpu_to_je32(++dir_f->highest_version);
421 rd->ino = cpu_to_je32(inode->i_ino);
422 rd->mctime = cpu_to_je32(get_seconds());
423 rd->nsize = namelen;
424 rd->type = DT_LNK;
425 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
426 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
427
428 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
429
430 if (IS_ERR(fd)) {
431 /* dirent failed to write. Delete the inode normally
432 as if it were the final unlink() */
433 jffs2_complete_reservation(c);
434 jffs2_free_raw_dirent(rd);
435 mutex_unlock(&dir_f->sem);
436 ret = PTR_ERR(fd);
437 goto fail;
438 }
439
440 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
441
442 jffs2_free_raw_dirent(rd);
443
444 /* Link the fd into the inode's list, obsoleting an old
445 one if necessary. */
446 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
447
448 mutex_unlock(&dir_f->sem);
449 jffs2_complete_reservation(c);
450
451 d_instantiate(dentry, inode);
452 unlock_new_inode(inode);
453 return 0;
454
455 fail:
456 iget_failed(inode);
457 return ret;
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
505 f = JFFS2_INODE_INFO(inode);
506
507 /* Directories get nlink 2 at start */
508 inode->i_nlink = 2;
509 /* but ic->pino_nlink is the parent ino# */
510 f->inocache->pino_nlink = dir_i->i_ino;
511
512 ri->data_crc = cpu_to_je32(0);
513 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
514
515 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
516
517 jffs2_free_raw_inode(ri);
518
519 if (IS_ERR(fn)) {
520 /* Eeek. Wave bye bye */
521 mutex_unlock(&f->sem);
522 jffs2_complete_reservation(c);
523 ret = PTR_ERR(fn);
524 goto fail;
525 }
526 /* No data here. Only a metadata node, which will be
527 obsoleted by the first data write
528 */
529 f->metadata = fn;
530 mutex_unlock(&f->sem);
531
532 jffs2_complete_reservation(c);
533
534 ret = jffs2_init_security(inode, dir_i);
535 if (ret)
536 goto fail;
537
538 ret = jffs2_init_acl_post(inode);
539 if (ret)
540 goto fail;
541
542 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
543 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
544 if (ret)
545 goto fail;
546
547 rd = jffs2_alloc_raw_dirent();
548 if (!rd) {
549 /* Argh. Now we treat it like a normal delete */
550 jffs2_complete_reservation(c);
551 ret = -ENOMEM;
552 goto fail;
553 }
554
555 dir_f = JFFS2_INODE_INFO(dir_i);
556 mutex_lock(&dir_f->sem);
557
558 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
559 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
560 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
561 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
562
563 rd->pino = cpu_to_je32(dir_i->i_ino);
564 rd->version = cpu_to_je32(++dir_f->highest_version);
565 rd->ino = cpu_to_je32(inode->i_ino);
566 rd->mctime = cpu_to_je32(get_seconds());
567 rd->nsize = namelen;
568 rd->type = DT_DIR;
569 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
570 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
571
572 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
573
574 if (IS_ERR(fd)) {
575 /* dirent failed to write. Delete the inode normally
576 as if it were the final unlink() */
577 jffs2_complete_reservation(c);
578 jffs2_free_raw_dirent(rd);
579 mutex_unlock(&dir_f->sem);
580 ret = PTR_ERR(fd);
581 goto fail;
582 }
583
584 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
585 inc_nlink(dir_i);
586
587 jffs2_free_raw_dirent(rd);
588
589 /* Link the fd into the inode's list, obsoleting an old
590 one if necessary. */
591 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
592
593 mutex_unlock(&dir_f->sem);
594 jffs2_complete_reservation(c);
595
596 d_instantiate(dentry, inode);
597 unlock_new_inode(inode);
598 return 0;
599
600 fail:
601 iget_failed(inode);
602 return ret;
603 }
604
605 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
606 {
607 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
608 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
609 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
610 struct jffs2_full_dirent *fd;
611 int ret;
612 uint32_t now = get_seconds();
613
614 for (fd = f->dents ; fd; fd = fd->next) {
615 if (fd->ino)
616 return -ENOTEMPTY;
617 }
618
619 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
620 dentry->d_name.len, f, now);
621 if (!ret) {
622 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
623 clear_nlink(dentry->d_inode);
624 drop_nlink(dir_i);
625 }
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 int ret;
643
644 if (!new_valid_dev(rdev))
645 return -EINVAL;
646
647 ri = jffs2_alloc_raw_inode();
648 if (!ri)
649 return -ENOMEM;
650
651 c = JFFS2_SB_INFO(dir_i->i_sb);
652
653 if (S_ISBLK(mode) || S_ISCHR(mode))
654 devlen = jffs2_encode_dev(&dev, rdev);
655
656 /* Try to reserve enough space for both node and dirent.
657 * Just the node will do for now, though
658 */
659 namelen = dentry->d_name.len;
660 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
661 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
662
663 if (ret) {
664 jffs2_free_raw_inode(ri);
665 return ret;
666 }
667
668 inode = jffs2_new_inode(dir_i, mode, ri);
669
670 if (IS_ERR(inode)) {
671 jffs2_free_raw_inode(ri);
672 jffs2_complete_reservation(c);
673 return PTR_ERR(inode);
674 }
675 inode->i_op = &jffs2_file_inode_operations;
676 init_special_inode(inode, inode->i_mode, rdev);
677
678 f = JFFS2_INODE_INFO(inode);
679
680 ri->dsize = ri->csize = cpu_to_je32(devlen);
681 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
682 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
683
684 ri->compr = JFFS2_COMPR_NONE;
685 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
686 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
687
688 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
689
690 jffs2_free_raw_inode(ri);
691
692 if (IS_ERR(fn)) {
693 /* Eeek. Wave bye bye */
694 mutex_unlock(&f->sem);
695 jffs2_complete_reservation(c);
696 ret = PTR_ERR(fn);
697 goto fail;
698 }
699 /* No data here. Only a metadata node, which will be
700 obsoleted by the first data write
701 */
702 f->metadata = fn;
703 mutex_unlock(&f->sem);
704
705 jffs2_complete_reservation(c);
706
707 ret = jffs2_init_security(inode, dir_i);
708 if (ret)
709 goto fail;
710
711 ret = jffs2_init_acl_post(inode);
712 if (ret)
713 goto fail;
714
715 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
716 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
717 if (ret)
718 goto fail;
719
720 rd = jffs2_alloc_raw_dirent();
721 if (!rd) {
722 /* Argh. Now we treat it like a normal delete */
723 jffs2_complete_reservation(c);
724 ret = -ENOMEM;
725 goto fail;
726 }
727
728 dir_f = JFFS2_INODE_INFO(dir_i);
729 mutex_lock(&dir_f->sem);
730
731 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
732 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
733 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
734 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
735
736 rd->pino = cpu_to_je32(dir_i->i_ino);
737 rd->version = cpu_to_je32(++dir_f->highest_version);
738 rd->ino = cpu_to_je32(inode->i_ino);
739 rd->mctime = cpu_to_je32(get_seconds());
740 rd->nsize = namelen;
741
742 /* XXX: This is ugly. */
743 rd->type = (mode & S_IFMT) >> 12;
744
745 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
746 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
747
748 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
749
750 if (IS_ERR(fd)) {
751 /* dirent failed to write. Delete the inode normally
752 as if it were the final unlink() */
753 jffs2_complete_reservation(c);
754 jffs2_free_raw_dirent(rd);
755 mutex_unlock(&dir_f->sem);
756 ret = PTR_ERR(fd);
757 goto fail;
758 }
759
760 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
761
762 jffs2_free_raw_dirent(rd);
763
764 /* Link the fd into the inode's list, obsoleting an old
765 one if necessary. */
766 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
767
768 mutex_unlock(&dir_f->sem);
769 jffs2_complete_reservation(c);
770
771 d_instantiate(dentry, inode);
772 unlock_new_inode(inode);
773 return 0;
774
775 fail:
776 iget_failed(inode);
777 return ret;
778 }
779
780 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
781 struct inode *new_dir_i, struct dentry *new_dentry)
782 {
783 int ret;
784 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
785 struct jffs2_inode_info *victim_f = NULL;
786 uint8_t type;
787 uint32_t now;
788
789 /* The VFS will check for us and prevent trying to rename a
790 * file over a directory and vice versa, but if it's a directory,
791 * the VFS can't check whether the victim is empty. The filesystem
792 * needs to do that for itself.
793 */
794 if (new_dentry->d_inode) {
795 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
796 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
797 struct jffs2_full_dirent *fd;
798
799 mutex_lock(&victim_f->sem);
800 for (fd = victim_f->dents; fd; fd = fd->next) {
801 if (fd->ino) {
802 mutex_unlock(&victim_f->sem);
803 return -ENOTEMPTY;
804 }
805 }
806 mutex_unlock(&victim_f->sem);
807 }
808 }
809
810 /* XXX: We probably ought to alloc enough space for
811 both nodes at the same time. Writing the new link,
812 then getting -ENOSPC, is quite bad :)
813 */
814
815 /* Make a hard link */
816
817 /* XXX: This is ugly */
818 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
819 if (!type) type = DT_REG;
820
821 now = get_seconds();
822 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
823 old_dentry->d_inode->i_ino, type,
824 new_dentry->d_name.name, new_dentry->d_name.len, now);
825
826 if (ret)
827 return ret;
828
829 if (victim_f) {
830 /* There was a victim. Kill it off nicely */
831 drop_nlink(new_dentry->d_inode);
832 /* Don't oops if the victim was a dirent pointing to an
833 inode which didn't exist. */
834 if (victim_f->inocache) {
835 mutex_lock(&victim_f->sem);
836 if (S_ISDIR(new_dentry->d_inode->i_mode))
837 victim_f->inocache->pino_nlink = 0;
838 else
839 victim_f->inocache->pino_nlink--;
840 mutex_unlock(&victim_f->sem);
841 }
842 }
843
844 /* If it was a directory we moved, and there was no victim,
845 increase i_nlink on its new parent */
846 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
847 inc_nlink(new_dir_i);
848
849 /* Unlink the original */
850 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
851 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
852
853 /* We don't touch inode->i_nlink */
854
855 if (ret) {
856 /* Oh shit. We really ought to make a single node which can do both atomically */
857 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
858 mutex_lock(&f->sem);
859 inc_nlink(old_dentry->d_inode);
860 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
861 f->inocache->pino_nlink++;
862 mutex_unlock(&f->sem);
863
864 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
865 /* Might as well let the VFS know */
866 d_instantiate(new_dentry, old_dentry->d_inode);
867 ihold(old_dentry->d_inode);
868 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
869 return ret;
870 }
871
872 if (S_ISDIR(old_dentry->d_inode->i_mode))
873 drop_nlink(old_dir_i);
874
875 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
876
877 return 0;
878 }
879
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