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OMAP3 SRF: MPU/CORE/PD latency modeling
[linux-ginger.git] / fs / jffs2 / dir.c
blob7aa4417e085f2870acd84598c2a5bd0c3654b20c
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 .unlocked_ioctl=jffs2_ioctl,
42 .fsync = jffs2_fsync,
43 .llseek = generic_file_llseek,
44 };
45
46
47 const struct inode_operations jffs2_dir_inode_operations =
48 {
49 .create = jffs2_create,
50 .lookup = jffs2_lookup,
51 .link = jffs2_link,
52 .unlink = jffs2_unlink,
53 .symlink = jffs2_symlink,
54 .mkdir = jffs2_mkdir,
55 .rmdir = jffs2_rmdir,
56 .mknod = jffs2_mknod,
57 .rename = jffs2_rename,
58 .check_acl = jffs2_check_acl,
59 .setattr = jffs2_setattr,
60 .setxattr = jffs2_setxattr,
61 .getxattr = jffs2_getxattr,
62 .listxattr = jffs2_listxattr,
63 .removexattr = jffs2_removexattr
64 };
65
66 /***********************************************************************/
67
68
69 /* We keep the dirent list sorted in increasing order of name hash,
70 and we use the same hash function as the dentries. Makes this
71 nice and simple
72 */
73 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
74 struct nameidata *nd)
75 {
76 struct jffs2_inode_info *dir_f;
77 struct jffs2_sb_info *c;
78 struct jffs2_full_dirent *fd = NULL, *fd_list;
79 uint32_t ino = 0;
80 struct inode *inode = NULL;
81
82 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
83
84 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
85 return ERR_PTR(-ENAMETOOLONG);
86
87 dir_f = JFFS2_INODE_INFO(dir_i);
88 c = JFFS2_SB_INFO(dir_i->i_sb);
89
90 mutex_lock(&dir_f->sem);
91
92 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
93 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
94 if (fd_list->nhash == target->d_name.hash &&
95 (!fd || fd_list->version > fd->version) &&
96 strlen(fd_list->name) == target->d_name.len &&
97 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
98 fd = fd_list;
99 }
100 }
101 if (fd)
102 ino = fd->ino;
103 mutex_unlock(&dir_f->sem);
104 if (ino) {
105 inode = jffs2_iget(dir_i->i_sb, ino);
106 if (IS_ERR(inode)) {
107 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
108 return ERR_CAST(inode);
109 }
110 }
111
112 return d_splice_alias(inode, target);
113 }
114
115 /***********************************************************************/
116
117
118 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
119 {
120 struct jffs2_inode_info *f;
121 struct jffs2_sb_info *c;
122 struct inode *inode = filp->f_path.dentry->d_inode;
123 struct jffs2_full_dirent *fd;
124 unsigned long offset, curofs;
125
126 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
127
128 f = JFFS2_INODE_INFO(inode);
129 c = JFFS2_SB_INFO(inode->i_sb);
130
131 offset = filp->f_pos;
132
133 if (offset == 0) {
134 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
135 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
136 goto out;
137 offset++;
138 }
139 if (offset == 1) {
140 unsigned long pino = parent_ino(filp->f_path.dentry);
141 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
142 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
143 goto out;
144 offset++;
145 }
146
147 curofs=1;
148 mutex_lock(&f->sem);
149 for (fd = f->dents; fd; fd = fd->next) {
150
151 curofs++;
152 /* First loop: curofs = 2; offset = 2 */
153 if (curofs < offset) {
154 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
155 fd->name, fd->ino, fd->type, curofs, offset));
156 continue;
157 }
158 if (!fd->ino) {
159 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
160 offset++;
161 continue;
162 }
163 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
164 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
165 break;
166 offset++;
167 }
168 mutex_unlock(&f->sem);
169 out:
170 filp->f_pos = offset;
171 return 0;
172 }
173
174 /***********************************************************************/
175
176
177 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
178 struct nameidata *nd)
179 {
180 struct jffs2_raw_inode *ri;
181 struct jffs2_inode_info *f, *dir_f;
182 struct jffs2_sb_info *c;
183 struct inode *inode;
184 int ret;
185
186 ri = jffs2_alloc_raw_inode();
187 if (!ri)
188 return -ENOMEM;
189
190 c = JFFS2_SB_INFO(dir_i->i_sb);
191
192 D1(printk(KERN_DEBUG "jffs2_create()\n"));
193
194 inode = jffs2_new_inode(dir_i, mode, ri);
195
196 if (IS_ERR(inode)) {
197 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
198 jffs2_free_raw_inode(ri);
199 return PTR_ERR(inode);
200 }
201
202 inode->i_op = &jffs2_file_inode_operations;
203 inode->i_fop = &jffs2_file_operations;
204 inode->i_mapping->a_ops = &jffs2_file_address_operations;
205 inode->i_mapping->nrpages = 0;
206
207 f = JFFS2_INODE_INFO(inode);
208 dir_f = JFFS2_INODE_INFO(dir_i);
209
210 /* jffs2_do_create() will want to lock it, _after_ reserving
211 space and taking c-alloc_sem. If we keep it locked here,
212 lockdep gets unhappy (although it's a false positive;
213 nothing else will be looking at this inode yet so there's
214 no chance of AB-BA deadlock involving its f->sem). */
215 mutex_unlock(&f->sem);
216
217 ret = jffs2_do_create(c, dir_f, f, ri,
218 dentry->d_name.name, dentry->d_name.len);
219 if (ret)
220 goto fail;
221
222 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
223
224 jffs2_free_raw_inode(ri);
225 d_instantiate(dentry, inode);
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 return 0;
231
232 fail:
233 make_bad_inode(inode);
234 iput(inode);
235 jffs2_free_raw_inode(ri);
236 return ret;
237 }
238
239 /***********************************************************************/
240
241
242 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
243 {
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
247 int ret;
248 uint32_t now = get_seconds();
249
250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
251 dentry->d_name.len, dead_f, now);
252 if (dead_f->inocache)
253 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
254 if (!ret)
255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
256 return ret;
257 }
258 /***********************************************************************/
259
260
261 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
262 {
263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
266 int ret;
267 uint8_t type;
268 uint32_t now;
269
270 /* Don't let people make hard links to bad inodes. */
271 if (!f->inocache)
272 return -EIO;
273
274 if (S_ISDIR(old_dentry->d_inode->i_mode))
275 return -EPERM;
276
277 /* XXX: This is ugly */
278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
279 if (!type) type = DT_REG;
280
281 now = get_seconds();
282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
283
284 if (!ret) {
285 mutex_lock(&f->sem);
286 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
287 mutex_unlock(&f->sem);
288 d_instantiate(dentry, old_dentry->d_inode);
289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
290 atomic_inc(&old_dentry->d_inode->i_count);
291 }
292 return ret;
293 }
294
295 /***********************************************************************/
296
297 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
298 {
299 struct jffs2_inode_info *f, *dir_f;
300 struct jffs2_sb_info *c;
301 struct inode *inode;
302 struct jffs2_raw_inode *ri;
303 struct jffs2_raw_dirent *rd;
304 struct jffs2_full_dnode *fn;
305 struct jffs2_full_dirent *fd;
306 int namelen;
307 uint32_t alloclen;
308 int ret, targetlen = strlen(target);
309
310 /* FIXME: If you care. We'd need to use frags for the target
311 if it grows much more than this */
312 if (targetlen > 254)
313 return -ENAMETOOLONG;
314
315 ri = jffs2_alloc_raw_inode();
316
317 if (!ri)
318 return -ENOMEM;
319
320 c = JFFS2_SB_INFO(dir_i->i_sb);
321
322 /* Try to reserve enough space for both node and dirent.
323 * Just the node will do for now, though
324 */
325 namelen = dentry->d_name.len;
326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
328
329 if (ret) {
330 jffs2_free_raw_inode(ri);
331 return ret;
332 }
333
334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
335
336 if (IS_ERR(inode)) {
337 jffs2_free_raw_inode(ri);
338 jffs2_complete_reservation(c);
339 return PTR_ERR(inode);
340 }
341
342 inode->i_op = &jffs2_symlink_inode_operations;
343
344 f = JFFS2_INODE_INFO(inode);
345
346 inode->i_size = targetlen;
347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
350
351 ri->compr = JFFS2_COMPR_NONE;
352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
354
355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
356
357 jffs2_free_raw_inode(ri);
358
359 if (IS_ERR(fn)) {
360 /* Eeek. Wave bye bye */
361 mutex_unlock(&f->sem);
362 jffs2_complete_reservation(c);
363 jffs2_clear_inode(inode);
364 return PTR_ERR(fn);
365 }
366
367 /* We use f->target field to store the target path. */
368 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
369 if (!f->target) {
370 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
371 mutex_unlock(&f->sem);
372 jffs2_complete_reservation(c);
373 jffs2_clear_inode(inode);
374 return -ENOMEM;
375 }
376
377 memcpy(f->target, target, targetlen + 1);
378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
379
380 /* No data here. Only a metadata node, which will be
381 obsoleted by the first data write
382 */
383 f->metadata = fn;
384 mutex_unlock(&f->sem);
385
386 jffs2_complete_reservation(c);
387
388 ret = jffs2_init_security(inode, dir_i);
389 if (ret) {
390 jffs2_clear_inode(inode);
391 return ret;
392 }
393 ret = jffs2_init_acl_post(inode);
394 if (ret) {
395 jffs2_clear_inode(inode);
396 return ret;
397 }
398
399 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
400 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
401 if (ret) {
402 /* Eep. */
403 jffs2_clear_inode(inode);
404 return ret;
405 }
406
407 rd = jffs2_alloc_raw_dirent();
408 if (!rd) {
409 /* Argh. Now we treat it like a normal delete */
410 jffs2_complete_reservation(c);
411 jffs2_clear_inode(inode);
412 return -ENOMEM;
413 }
414
415 dir_f = JFFS2_INODE_INFO(dir_i);
416 mutex_lock(&dir_f->sem);
417
418 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
419 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
420 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
421 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
422
423 rd->pino = cpu_to_je32(dir_i->i_ino);
424 rd->version = cpu_to_je32(++dir_f->highest_version);
425 rd->ino = cpu_to_je32(inode->i_ino);
426 rd->mctime = cpu_to_je32(get_seconds());
427 rd->nsize = namelen;
428 rd->type = DT_LNK;
429 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
430 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
431
432 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
433
434 if (IS_ERR(fd)) {
435 /* dirent failed to write. Delete the inode normally
436 as if it were the final unlink() */
437 jffs2_complete_reservation(c);
438 jffs2_free_raw_dirent(rd);
439 mutex_unlock(&dir_f->sem);
440 jffs2_clear_inode(inode);
441 return PTR_ERR(fd);
442 }
443
444 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
445
446 jffs2_free_raw_dirent(rd);
447
448 /* Link the fd into the inode's list, obsoleting an old
449 one if necessary. */
450 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
451
452 mutex_unlock(&dir_f->sem);
453 jffs2_complete_reservation(c);
454
455 d_instantiate(dentry, inode);
456 return 0;
457 }
458
459
460 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
461 {
462 struct jffs2_inode_info *f, *dir_f;
463 struct jffs2_sb_info *c;
464 struct inode *inode;
465 struct jffs2_raw_inode *ri;
466 struct jffs2_raw_dirent *rd;
467 struct jffs2_full_dnode *fn;
468 struct jffs2_full_dirent *fd;
469 int namelen;
470 uint32_t alloclen;
471 int ret;
472
473 mode |= S_IFDIR;
474
475 ri = jffs2_alloc_raw_inode();
476 if (!ri)
477 return -ENOMEM;
478
479 c = JFFS2_SB_INFO(dir_i->i_sb);
480
481 /* Try to reserve enough space for both node and dirent.
482 * Just the node will do for now, though
483 */
484 namelen = dentry->d_name.len;
485 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
486 JFFS2_SUMMARY_INODE_SIZE);
487
488 if (ret) {
489 jffs2_free_raw_inode(ri);
490 return ret;
491 }
492
493 inode = jffs2_new_inode(dir_i, mode, ri);
494
495 if (IS_ERR(inode)) {
496 jffs2_free_raw_inode(ri);
497 jffs2_complete_reservation(c);
498 return PTR_ERR(inode);
499 }
500
501 inode->i_op = &jffs2_dir_inode_operations;
502 inode->i_fop = &jffs2_dir_operations;
503
504 f = JFFS2_INODE_INFO(inode);
505
506 /* Directories get nlink 2 at start */
507 inode->i_nlink = 2;
508 /* but ic->pino_nlink is the parent ino# */
509 f->inocache->pino_nlink = dir_i->i_ino;
510
511 ri->data_crc = cpu_to_je32(0);
512 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
513
514 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
515
516 jffs2_free_raw_inode(ri);
517
518 if (IS_ERR(fn)) {
519 /* Eeek. Wave bye bye */
520 mutex_unlock(&f->sem);
521 jffs2_complete_reservation(c);
522 jffs2_clear_inode(inode);
523 return PTR_ERR(fn);
524 }
525 /* No data here. Only a metadata node, which will be
526 obsoleted by the first data write
527 */
528 f->metadata = fn;
529 mutex_unlock(&f->sem);
530
531 jffs2_complete_reservation(c);
532
533 ret = jffs2_init_security(inode, dir_i);
534 if (ret) {
535 jffs2_clear_inode(inode);
536 return ret;
537 }
538 ret = jffs2_init_acl_post(inode);
539 if (ret) {
540 jffs2_clear_inode(inode);
541 return ret;
542 }
543
544 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
545 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
546 if (ret) {
547 /* Eep. */
548 jffs2_clear_inode(inode);
549 return ret;
550 }
551
552 rd = jffs2_alloc_raw_dirent();
553 if (!rd) {
554 /* Argh. Now we treat it like a normal delete */
555 jffs2_complete_reservation(c);
556 jffs2_clear_inode(inode);
557 return -ENOMEM;
558 }
559
560 dir_f = JFFS2_INODE_INFO(dir_i);
561 mutex_lock(&dir_f->sem);
562
563 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
564 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
565 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
566 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
567
568 rd->pino = cpu_to_je32(dir_i->i_ino);
569 rd->version = cpu_to_je32(++dir_f->highest_version);
570 rd->ino = cpu_to_je32(inode->i_ino);
571 rd->mctime = cpu_to_je32(get_seconds());
572 rd->nsize = namelen;
573 rd->type = DT_DIR;
574 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
575 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
576
577 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
578
579 if (IS_ERR(fd)) {
580 /* dirent failed to write. Delete the inode normally
581 as if it were the final unlink() */
582 jffs2_complete_reservation(c);
583 jffs2_free_raw_dirent(rd);
584 mutex_unlock(&dir_f->sem);
585 jffs2_clear_inode(inode);
586 return PTR_ERR(fd);
587 }
588
589 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
590 inc_nlink(dir_i);
591
592 jffs2_free_raw_dirent(rd);
593
594 /* Link the fd into the inode's list, obsoleting an old
595 one if necessary. */
596 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
597
598 mutex_unlock(&dir_f->sem);
599 jffs2_complete_reservation(c);
600
601 d_instantiate(dentry, inode);
602 return 0;
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 jffs2_clear_inode(inode);
697 return PTR_ERR(fn);
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 jffs2_clear_inode(inode);
710 return ret;
711 }
712 ret = jffs2_init_acl_post(inode);
713 if (ret) {
714 jffs2_clear_inode(inode);
715 return ret;
716 }
717
718 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
719 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
720 if (ret) {
721 /* Eep. */
722 jffs2_clear_inode(inode);
723 return ret;
724 }
725
726 rd = jffs2_alloc_raw_dirent();
727 if (!rd) {
728 /* Argh. Now we treat it like a normal delete */
729 jffs2_complete_reservation(c);
730 jffs2_clear_inode(inode);
731 return -ENOMEM;
732 }
733
734 dir_f = JFFS2_INODE_INFO(dir_i);
735 mutex_lock(&dir_f->sem);
736
737 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
738 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
739 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
740 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
741
742 rd->pino = cpu_to_je32(dir_i->i_ino);
743 rd->version = cpu_to_je32(++dir_f->highest_version);
744 rd->ino = cpu_to_je32(inode->i_ino);
745 rd->mctime = cpu_to_je32(get_seconds());
746 rd->nsize = namelen;
747
748 /* XXX: This is ugly. */
749 rd->type = (mode & S_IFMT) >> 12;
750
751 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
752 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
753
754 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
755
756 if (IS_ERR(fd)) {
757 /* dirent failed to write. Delete the inode normally
758 as if it were the final unlink() */
759 jffs2_complete_reservation(c);
760 jffs2_free_raw_dirent(rd);
761 mutex_unlock(&dir_f->sem);
762 jffs2_clear_inode(inode);
763 return PTR_ERR(fd);
764 }
765
766 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
767
768 jffs2_free_raw_dirent(rd);
769
770 /* Link the fd into the inode's list, obsoleting an old
771 one if necessary. */
772 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
773
774 mutex_unlock(&dir_f->sem);
775 jffs2_complete_reservation(c);
776
777 d_instantiate(dentry, inode);
778
779 return 0;
780 }
781
782 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
783 struct inode *new_dir_i, struct dentry *new_dentry)
784 {
785 int ret;
786 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
787 struct jffs2_inode_info *victim_f = NULL;
788 uint8_t type;
789 uint32_t now;
790
791 /* The VFS will check for us and prevent trying to rename a
792 * file over a directory and vice versa, but if it's a directory,
793 * the VFS can't check whether the victim is empty. The filesystem
794 * needs to do that for itself.
795 */
796 if (new_dentry->d_inode) {
797 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
798 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
799 struct jffs2_full_dirent *fd;
800
801 mutex_lock(&victim_f->sem);
802 for (fd = victim_f->dents; fd; fd = fd->next) {
803 if (fd->ino) {
804 mutex_unlock(&victim_f->sem);
805 return -ENOTEMPTY;
806 }
807 }
808 mutex_unlock(&victim_f->sem);
809 }
810 }
811
812 /* XXX: We probably ought to alloc enough space for
813 both nodes at the same time. Writing the new link,
814 then getting -ENOSPC, is quite bad :)
815 */
816
817 /* Make a hard link */
818
819 /* XXX: This is ugly */
820 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
821 if (!type) type = DT_REG;
822
823 now = get_seconds();
824 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
825 old_dentry->d_inode->i_ino, type,
826 new_dentry->d_name.name, new_dentry->d_name.len, now);
827
828 if (ret)
829 return ret;
830
831 if (victim_f) {
832 /* There was a victim. Kill it off nicely */
833 drop_nlink(new_dentry->d_inode);
834 /* Don't oops if the victim was a dirent pointing to an
835 inode which didn't exist. */
836 if (victim_f->inocache) {
837 mutex_lock(&victim_f->sem);
838 if (S_ISDIR(new_dentry->d_inode->i_mode))
839 victim_f->inocache->pino_nlink = 0;
840 else
841 victim_f->inocache->pino_nlink--;
842 mutex_unlock(&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 mutex_lock(&f->sem);
861 inc_nlink(old_dentry->d_inode);
862 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
863 f->inocache->pino_nlink++;
864 mutex_unlock(&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 for Ginger Game Console