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[JFFS2] Remove compatibilty cruft for ancient kernels
[linux-2.6/openmoko-kernel/knife-kernel.git] / fs / jffs2 / dir.c
blob3ca0d25eef1d529f82da3ec83d1644c331d629f6
1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright (C) 2001-2003 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 * $Id: dir.c,v 1.86 2005/07/06 12:13:09 dwmw2 Exp $
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/sched.h>
17 #include <linux/fs.h>
18 #include <linux/crc32.h>
19 #include <linux/jffs2.h>
20 #include <linux/jffs2_fs_i.h>
21 #include <linux/jffs2_fs_sb.h>
22 #include <linux/time.h>
23 #include "nodelist.h"
24
25 static int jffs2_readdir (struct file *, void *, filldir_t);
26
27 static int jffs2_create (struct inode *,struct dentry *,int,
28 struct nameidata *);
29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 struct nameidata *);
31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32 static int jffs2_unlink (struct inode *,struct dentry *);
33 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
34 static int jffs2_mkdir (struct inode *,struct dentry *,int);
35 static int jffs2_rmdir (struct inode *,struct dentry *);
36 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
37 static int jffs2_rename (struct inode *, struct dentry *,
38 struct inode *, struct dentry *);
39
40 struct file_operations jffs2_dir_operations =
41 {
42 .read = generic_read_dir,
43 .readdir = jffs2_readdir,
44 .ioctl = jffs2_ioctl,
45 .fsync = jffs2_fsync
46 };
47
48
49 struct inode_operations jffs2_dir_inode_operations =
50 {
51 .create = jffs2_create,
52 .lookup = jffs2_lookup,
53 .link = jffs2_link,
54 .unlink = jffs2_unlink,
55 .symlink = jffs2_symlink,
56 .mkdir = jffs2_mkdir,
57 .rmdir = jffs2_rmdir,
58 .mknod = jffs2_mknod,
59 .rename = jffs2_rename,
60 .setattr = jffs2_setattr,
61 };
62
63 /***********************************************************************/
64
65
66 /* We keep the dirent list sorted in increasing order of name hash,
67 and we use the same hash function as the dentries. Makes this
68 nice and simple
69 */
70 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
71 struct nameidata *nd)
72 {
73 struct jffs2_inode_info *dir_f;
74 struct jffs2_sb_info *c;
75 struct jffs2_full_dirent *fd = NULL, *fd_list;
76 uint32_t ino = 0;
77 struct inode *inode = NULL;
78
79 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
80
81 dir_f = JFFS2_INODE_INFO(dir_i);
82 c = JFFS2_SB_INFO(dir_i->i_sb);
83
84 down(&dir_f->sem);
85
86 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
87 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
88 if (fd_list->nhash == target->d_name.hash &&
89 (!fd || fd_list->version > fd->version) &&
90 strlen(fd_list->name) == target->d_name.len &&
91 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
92 fd = fd_list;
93 }
94 }
95 if (fd)
96 ino = fd->ino;
97 up(&dir_f->sem);
98 if (ino) {
99 inode = iget(dir_i->i_sb, ino);
100 if (!inode) {
101 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
102 return (ERR_PTR(-EIO));
103 }
104 }
105
106 d_add(target, inode);
107
108 return NULL;
109 }
110
111 /***********************************************************************/
112
113
114 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
115 {
116 struct jffs2_inode_info *f;
117 struct jffs2_sb_info *c;
118 struct inode *inode = filp->f_dentry->d_inode;
119 struct jffs2_full_dirent *fd;
120 unsigned long offset, curofs;
121
122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
123
124 f = JFFS2_INODE_INFO(inode);
125 c = JFFS2_SB_INFO(inode->i_sb);
126
127 offset = filp->f_pos;
128
129 if (offset == 0) {
130 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
131 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
132 goto out;
133 offset++;
134 }
135 if (offset == 1) {
136 unsigned long pino = parent_ino(filp->f_dentry);
137 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
138 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
139 goto out;
140 offset++;
141 }
142
143 curofs=1;
144 down(&f->sem);
145 for (fd = f->dents; fd; fd = fd->next) {
146
147 curofs++;
148 /* First loop: curofs = 2; offset = 2 */
149 if (curofs < offset) {
150 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
151 fd->name, fd->ino, fd->type, curofs, offset));
152 continue;
153 }
154 if (!fd->ino) {
155 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
156 offset++;
157 continue;
158 }
159 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
160 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
161 break;
162 offset++;
163 }
164 up(&f->sem);
165 out:
166 filp->f_pos = offset;
167 return 0;
168 }
169
170 /***********************************************************************/
171
172
173 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
174 struct nameidata *nd)
175 {
176 struct jffs2_raw_inode *ri;
177 struct jffs2_inode_info *f, *dir_f;
178 struct jffs2_sb_info *c;
179 struct inode *inode;
180 int ret;
181
182 ri = jffs2_alloc_raw_inode();
183 if (!ri)
184 return -ENOMEM;
185
186 c = JFFS2_SB_INFO(dir_i->i_sb);
187
188 D1(printk(KERN_DEBUG "jffs2_create()\n"));
189
190 inode = jffs2_new_inode(dir_i, mode, ri);
191
192 if (IS_ERR(inode)) {
193 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
194 jffs2_free_raw_inode(ri);
195 return PTR_ERR(inode);
196 }
197
198 inode->i_op = &jffs2_file_inode_operations;
199 inode->i_fop = &jffs2_file_operations;
200 inode->i_mapping->a_ops = &jffs2_file_address_operations;
201 inode->i_mapping->nrpages = 0;
202
203 f = JFFS2_INODE_INFO(inode);
204 dir_f = JFFS2_INODE_INFO(dir_i);
205
206 ret = jffs2_do_create(c, dir_f, f, ri,
207 dentry->d_name.name, dentry->d_name.len);
208
209 if (ret) {
210 make_bad_inode(inode);
211 iput(inode);
212 jffs2_free_raw_inode(ri);
213 return ret;
214 }
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
226 /***********************************************************************/
227
228
229 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
230 {
231 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
232 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
233 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
234 int ret;
235
236 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
237 dentry->d_name.len, dead_f);
238 if (dead_f->inocache)
239 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
240 return ret;
241 }
242 /***********************************************************************/
243
244
245 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
246 {
247 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
248 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
250 int ret;
251 uint8_t type;
252
253 /* Don't let people make hard links to bad inodes. */
254 if (!f->inocache)
255 return -EIO;
256
257 if (S_ISDIR(old_dentry->d_inode->i_mode))
258 return -EPERM;
259
260 /* XXX: This is ugly */
261 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
262 if (!type) type = DT_REG;
263
264 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
265
266 if (!ret) {
267 down(&f->sem);
268 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
269 up(&f->sem);
270 d_instantiate(dentry, old_dentry->d_inode);
271 atomic_inc(&old_dentry->d_inode->i_count);
272 }
273 return ret;
274 }
275
276 /***********************************************************************/
277
278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
279 {
280 struct jffs2_inode_info *f, *dir_f;
281 struct jffs2_sb_info *c;
282 struct inode *inode;
283 struct jffs2_raw_inode *ri;
284 struct jffs2_raw_dirent *rd;
285 struct jffs2_full_dnode *fn;
286 struct jffs2_full_dirent *fd;
287 int namelen;
288 uint32_t alloclen, phys_ofs;
289 int ret, targetlen = strlen(target);
290
291 /* FIXME: If you care. We'd need to use frags for the target
292 if it grows much more than this */
293 if (targetlen > 254)
294 return -EINVAL;
295
296 ri = jffs2_alloc_raw_inode();
297
298 if (!ri)
299 return -ENOMEM;
300
301 c = JFFS2_SB_INFO(dir_i->i_sb);
302
303 /* Try to reserve enough space for both node and dirent.
304 * Just the node will do for now, though
305 */
306 namelen = dentry->d_name.len;
307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
308
309 if (ret) {
310 jffs2_free_raw_inode(ri);
311 return ret;
312 }
313
314 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
315
316 if (IS_ERR(inode)) {
317 jffs2_free_raw_inode(ri);
318 jffs2_complete_reservation(c);
319 return PTR_ERR(inode);
320 }
321
322 inode->i_op = &jffs2_symlink_inode_operations;
323
324 f = JFFS2_INODE_INFO(inode);
325
326 inode->i_size = targetlen;
327 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
328 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
329 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
330
331 ri->compr = JFFS2_COMPR_NONE;
332 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
333 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
334
335 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
336
337 jffs2_free_raw_inode(ri);
338
339 if (IS_ERR(fn)) {
340 /* Eeek. Wave bye bye */
341 up(&f->sem);
342 jffs2_complete_reservation(c);
343 jffs2_clear_inode(inode);
344 return PTR_ERR(fn);
345 }
346
347 /* We use f->dents field to store the target path. */
348 f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
349 if (!f->dents) {
350 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
351 up(&f->sem);
352 jffs2_complete_reservation(c);
353 jffs2_clear_inode(inode);
354 return -ENOMEM;
355 }
356
357 memcpy(f->dents, target, targetlen + 1);
358 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));
359
360 /* No data here. Only a metadata node, which will be
361 obsoleted by the first data write
362 */
363 f->metadata = fn;
364 up(&f->sem);
365
366 jffs2_complete_reservation(c);
367 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
368 if (ret) {
369 /* Eep. */
370 jffs2_clear_inode(inode);
371 return ret;
372 }
373
374 rd = jffs2_alloc_raw_dirent();
375 if (!rd) {
376 /* Argh. Now we treat it like a normal delete */
377 jffs2_complete_reservation(c);
378 jffs2_clear_inode(inode);
379 return -ENOMEM;
380 }
381
382 dir_f = JFFS2_INODE_INFO(dir_i);
383 down(&dir_f->sem);
384
385 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
386 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
387 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
388 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
389
390 rd->pino = cpu_to_je32(dir_i->i_ino);
391 rd->version = cpu_to_je32(++dir_f->highest_version);
392 rd->ino = cpu_to_je32(inode->i_ino);
393 rd->mctime = cpu_to_je32(get_seconds());
394 rd->nsize = namelen;
395 rd->type = DT_LNK;
396 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
397 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
398
399 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
400
401 if (IS_ERR(fd)) {
402 /* dirent failed to write. Delete the inode normally
403 as if it were the final unlink() */
404 jffs2_complete_reservation(c);
405 jffs2_free_raw_dirent(rd);
406 up(&dir_f->sem);
407 jffs2_clear_inode(inode);
408 return PTR_ERR(fd);
409 }
410
411 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
412
413 jffs2_free_raw_dirent(rd);
414
415 /* Link the fd into the inode's list, obsoleting an old
416 one if necessary. */
417 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
418
419 up(&dir_f->sem);
420 jffs2_complete_reservation(c);
421
422 d_instantiate(dentry, inode);
423 return 0;
424 }
425
426
427 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
428 {
429 struct jffs2_inode_info *f, *dir_f;
430 struct jffs2_sb_info *c;
431 struct inode *inode;
432 struct jffs2_raw_inode *ri;
433 struct jffs2_raw_dirent *rd;
434 struct jffs2_full_dnode *fn;
435 struct jffs2_full_dirent *fd;
436 int namelen;
437 uint32_t alloclen, phys_ofs;
438 int ret;
439
440 mode |= S_IFDIR;
441
442 ri = jffs2_alloc_raw_inode();
443 if (!ri)
444 return -ENOMEM;
445
446 c = JFFS2_SB_INFO(dir_i->i_sb);
447
448 /* Try to reserve enough space for both node and dirent.
449 * Just the node will do for now, though
450 */
451 namelen = dentry->d_name.len;
452 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
453
454 if (ret) {
455 jffs2_free_raw_inode(ri);
456 return ret;
457 }
458
459 inode = jffs2_new_inode(dir_i, mode, ri);
460
461 if (IS_ERR(inode)) {
462 jffs2_free_raw_inode(ri);
463 jffs2_complete_reservation(c);
464 return PTR_ERR(inode);
465 }
466
467 inode->i_op = &jffs2_dir_inode_operations;
468 inode->i_fop = &jffs2_dir_operations;
469 /* Directories get nlink 2 at start */
470 inode->i_nlink = 2;
471
472 f = JFFS2_INODE_INFO(inode);
473
474 ri->data_crc = cpu_to_je32(0);
475 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
476
477 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
478
479 jffs2_free_raw_inode(ri);
480
481 if (IS_ERR(fn)) {
482 /* Eeek. Wave bye bye */
483 up(&f->sem);
484 jffs2_complete_reservation(c);
485 jffs2_clear_inode(inode);
486 return PTR_ERR(fn);
487 }
488 /* No data here. Only a metadata node, which will be
489 obsoleted by the first data write
490 */
491 f->metadata = fn;
492 up(&f->sem);
493
494 jffs2_complete_reservation(c);
495 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
496 if (ret) {
497 /* Eep. */
498 jffs2_clear_inode(inode);
499 return ret;
500 }
501
502 rd = jffs2_alloc_raw_dirent();
503 if (!rd) {
504 /* Argh. Now we treat it like a normal delete */
505 jffs2_complete_reservation(c);
506 jffs2_clear_inode(inode);
507 return -ENOMEM;
508 }
509
510 dir_f = JFFS2_INODE_INFO(dir_i);
511 down(&dir_f->sem);
512
513 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
514 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
515 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
516 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
517
518 rd->pino = cpu_to_je32(dir_i->i_ino);
519 rd->version = cpu_to_je32(++dir_f->highest_version);
520 rd->ino = cpu_to_je32(inode->i_ino);
521 rd->mctime = cpu_to_je32(get_seconds());
522 rd->nsize = namelen;
523 rd->type = DT_DIR;
524 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
525 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
526
527 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
528
529 if (IS_ERR(fd)) {
530 /* dirent failed to write. Delete the inode normally
531 as if it were the final unlink() */
532 jffs2_complete_reservation(c);
533 jffs2_free_raw_dirent(rd);
534 up(&dir_f->sem);
535 jffs2_clear_inode(inode);
536 return PTR_ERR(fd);
537 }
538
539 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
540 dir_i->i_nlink++;
541
542 jffs2_free_raw_dirent(rd);
543
544 /* Link the fd into the inode's list, obsoleting an old
545 one if necessary. */
546 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
547
548 up(&dir_f->sem);
549 jffs2_complete_reservation(c);
550
551 d_instantiate(dentry, inode);
552 return 0;
553 }
554
555 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
556 {
557 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
558 struct jffs2_full_dirent *fd;
559 int ret;
560
561 for (fd = f->dents ; fd; fd = fd->next) {
562 if (fd->ino)
563 return -ENOTEMPTY;
564 }
565 ret = jffs2_unlink(dir_i, dentry);
566 if (!ret)
567 dir_i->i_nlink--;
568 return ret;
569 }
570
571 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
572 {
573 struct jffs2_inode_info *f, *dir_f;
574 struct jffs2_sb_info *c;
575 struct inode *inode;
576 struct jffs2_raw_inode *ri;
577 struct jffs2_raw_dirent *rd;
578 struct jffs2_full_dnode *fn;
579 struct jffs2_full_dirent *fd;
580 int namelen;
581 jint16_t dev;
582 int devlen = 0;
583 uint32_t alloclen, phys_ofs;
584 int ret;
585
586 if (!old_valid_dev(rdev))
587 return -EINVAL;
588
589 ri = jffs2_alloc_raw_inode();
590 if (!ri)
591 return -ENOMEM;
592
593 c = JFFS2_SB_INFO(dir_i->i_sb);
594
595 if (S_ISBLK(mode) || S_ISCHR(mode)) {
596 dev = cpu_to_je16(old_encode_dev(rdev));
597 devlen = sizeof(dev);
598 }
599
600 /* Try to reserve enough space for both node and dirent.
601 * Just the node will do for now, though
602 */
603 namelen = dentry->d_name.len;
604 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
605
606 if (ret) {
607 jffs2_free_raw_inode(ri);
608 return ret;
609 }
610
611 inode = jffs2_new_inode(dir_i, mode, ri);
612
613 if (IS_ERR(inode)) {
614 jffs2_free_raw_inode(ri);
615 jffs2_complete_reservation(c);
616 return PTR_ERR(inode);
617 }
618 inode->i_op = &jffs2_file_inode_operations;
619 init_special_inode(inode, inode->i_mode, rdev);
620
621 f = JFFS2_INODE_INFO(inode);
622
623 ri->dsize = ri->csize = cpu_to_je32(devlen);
624 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
625 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
626
627 ri->compr = JFFS2_COMPR_NONE;
628 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
629 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
630
631 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
632
633 jffs2_free_raw_inode(ri);
634
635 if (IS_ERR(fn)) {
636 /* Eeek. Wave bye bye */
637 up(&f->sem);
638 jffs2_complete_reservation(c);
639 jffs2_clear_inode(inode);
640 return PTR_ERR(fn);
641 }
642 /* No data here. Only a metadata node, which will be
643 obsoleted by the first data write
644 */
645 f->metadata = fn;
646 up(&f->sem);
647
648 jffs2_complete_reservation(c);
649 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
650 if (ret) {
651 /* Eep. */
652 jffs2_clear_inode(inode);
653 return ret;
654 }
655
656 rd = jffs2_alloc_raw_dirent();
657 if (!rd) {
658 /* Argh. Now we treat it like a normal delete */
659 jffs2_complete_reservation(c);
660 jffs2_clear_inode(inode);
661 return -ENOMEM;
662 }
663
664 dir_f = JFFS2_INODE_INFO(dir_i);
665 down(&dir_f->sem);
666
667 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
668 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
669 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
670 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
671
672 rd->pino = cpu_to_je32(dir_i->i_ino);
673 rd->version = cpu_to_je32(++dir_f->highest_version);
674 rd->ino = cpu_to_je32(inode->i_ino);
675 rd->mctime = cpu_to_je32(get_seconds());
676 rd->nsize = namelen;
677
678 /* XXX: This is ugly. */
679 rd->type = (mode & S_IFMT) >> 12;
680
681 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
682 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
683
684 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
685
686 if (IS_ERR(fd)) {
687 /* dirent failed to write. Delete the inode normally
688 as if it were the final unlink() */
689 jffs2_complete_reservation(c);
690 jffs2_free_raw_dirent(rd);
691 up(&dir_f->sem);
692 jffs2_clear_inode(inode);
693 return PTR_ERR(fd);
694 }
695
696 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
697
698 jffs2_free_raw_dirent(rd);
699
700 /* Link the fd into the inode's list, obsoleting an old
701 one if necessary. */
702 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
703
704 up(&dir_f->sem);
705 jffs2_complete_reservation(c);
706
707 d_instantiate(dentry, inode);
708
709 return 0;
710 }
711
712 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
713 struct inode *new_dir_i, struct dentry *new_dentry)
714 {
715 int ret;
716 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
717 struct jffs2_inode_info *victim_f = NULL;
718 uint8_t type;
719
720 /* The VFS will check for us and prevent trying to rename a
721 * file over a directory and vice versa, but if it's a directory,
722 * the VFS can't check whether the victim is empty. The filesystem
723 * needs to do that for itself.
724 */
725 if (new_dentry->d_inode) {
726 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
727 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
728 struct jffs2_full_dirent *fd;
729
730 down(&victim_f->sem);
731 for (fd = victim_f->dents; fd; fd = fd->next) {
732 if (fd->ino) {
733 up(&victim_f->sem);
734 return -ENOTEMPTY;
735 }
736 }
737 up(&victim_f->sem);
738 }
739 }
740
741 /* XXX: We probably ought to alloc enough space for
742 both nodes at the same time. Writing the new link,
743 then getting -ENOSPC, is quite bad :)
744 */
745
746 /* Make a hard link */
747
748 /* XXX: This is ugly */
749 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
750 if (!type) type = DT_REG;
751
752 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
753 old_dentry->d_inode->i_ino, type,
754 new_dentry->d_name.name, new_dentry->d_name.len);
755
756 if (ret)
757 return ret;
758
759 if (victim_f) {
760 /* There was a victim. Kill it off nicely */
761 new_dentry->d_inode->i_nlink--;
762 /* Don't oops if the victim was a dirent pointing to an
763 inode which didn't exist. */
764 if (victim_f->inocache) {
765 down(&victim_f->sem);
766 victim_f->inocache->nlink--;
767 up(&victim_f->sem);
768 }
769 }
770
771 /* If it was a directory we moved, and there was no victim,
772 increase i_nlink on its new parent */
773 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
774 new_dir_i->i_nlink++;
775
776 /* Unlink the original */
777 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
778 old_dentry->d_name.name, old_dentry->d_name.len, NULL);
779
780 /* We don't touch inode->i_nlink */
781
782 if (ret) {
783 /* Oh shit. We really ought to make a single node which can do both atomically */
784 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
785 down(&f->sem);
786 old_dentry->d_inode->i_nlink++;
787 if (f->inocache)
788 f->inocache->nlink++;
789 up(&f->sem);
790
791 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
792 /* Might as well let the VFS know */
793 d_instantiate(new_dentry, old_dentry->d_inode);
794 atomic_inc(&old_dentry->d_inode->i_count);
795 return ret;
796 }
797
798 if (S_ISDIR(old_dentry->d_inode->i_mode))
799 old_dir_i->i_nlink--;
800
801 return 0;
802 }
803
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