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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/fs.h>
18 #include <linux/crc32.h>
19 #include <linux/jffs2.h>
20 #include "jffs2_fs_i.h"
21 #include "jffs2_fs_sb.h"
22 #include <linux/time.h>
23 #include "nodelist.h"
24
25 static int jffs2_readdir (struct file *, struct dir_context *);
26
27 static int jffs2_create (struct user_namespace *, struct inode *,
28 struct dentry *, umode_t, bool);
29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 unsigned int);
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 user_namespace *, struct inode *,
34 struct dentry *, const char *);
35 static int jffs2_mkdir (struct user_namespace *, struct inode *,struct dentry *,
36 umode_t);
37 static int jffs2_rmdir (struct inode *,struct dentry *);
38 static int jffs2_mknod (struct user_namespace *, struct inode *,struct dentry *,
39 umode_t,dev_t);
40 static int jffs2_rename (struct user_namespace *, struct inode *,
41 struct dentry *, struct inode *, struct dentry *,
42 unsigned int);
43
44 const struct file_operations jffs2_dir_operations =
45 {
46 .read = generic_read_dir,
47 .iterate_shared=jffs2_readdir,
48 .unlocked_ioctl=jffs2_ioctl,
49 .fsync = jffs2_fsync,
50 .llseek = generic_file_llseek,
51 };
52
53
54 const struct inode_operations jffs2_dir_inode_operations =
55 {
56 .create = jffs2_create,
57 .lookup = jffs2_lookup,
58 .link = jffs2_link,
59 .unlink = jffs2_unlink,
60 .symlink = jffs2_symlink,
61 .mkdir = jffs2_mkdir,
62 .rmdir = jffs2_rmdir,
63 .mknod = jffs2_mknod,
64 .rename = jffs2_rename,
65 .get_acl = jffs2_get_acl,
66 .set_acl = jffs2_set_acl,
67 .setattr = jffs2_setattr,
68 .listxattr = jffs2_listxattr,
69 };
70
71 /***********************************************************************/
72
73
74 /* We keep the dirent list sorted in increasing order of name hash,
75 and we use the same hash function as the dentries. Makes this
76 nice and simple
77 */
jffs2_lookup(struct inode * dir_i,struct dentry * target,unsigned int flags)78 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
79 unsigned int flags)
80 {
81 struct jffs2_inode_info *dir_f;
82 struct jffs2_full_dirent *fd = NULL, *fd_list;
83 uint32_t ino = 0;
84 struct inode *inode = NULL;
85 unsigned int nhash;
86
87 jffs2_dbg(1, "jffs2_lookup()\n");
88
89 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
90 return ERR_PTR(-ENAMETOOLONG);
91
92 dir_f = JFFS2_INODE_INFO(dir_i);
93
94 /* The 'nhash' on the fd_list is not the same as the dentry hash */
95 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len);
96
97 mutex_lock(&dir_f->sem);
98
99 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
100 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) {
101 if (fd_list->nhash == nhash &&
102 (!fd || fd_list->version > fd->version) &&
103 strlen(fd_list->name) == target->d_name.len &&
104 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
105 fd = fd_list;
106 }
107 }
108 if (fd)
109 ino = fd->ino;
110 mutex_unlock(&dir_f->sem);
111 if (ino) {
112 inode = jffs2_iget(dir_i->i_sb, ino);
113 if (IS_ERR(inode))
114 pr_warn("iget() failed for ino #%u\n", ino);
115 }
116
117 return d_splice_alias(inode, target);
118 }
119
120 /***********************************************************************/
121
122
jffs2_readdir(struct file * file,struct dir_context * ctx)123 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
124 {
125 struct inode *inode = file_inode(file);
126 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
127 struct jffs2_full_dirent *fd;
128 unsigned long curofs = 1;
129
130 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
131
132 if (!dir_emit_dots(file, ctx))
133 return 0;
134
135 mutex_lock(&f->sem);
136 for (fd = f->dents; fd; fd = fd->next) {
137 curofs++;
138 /* First loop: curofs = 2; pos = 2 */
139 if (curofs < ctx->pos) {
140 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
141 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
142 continue;
143 }
144 if (!fd->ino) {
145 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
146 fd->name);
147 ctx->pos++;
148 continue;
149 }
150 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
151 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
152 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
153 break;
154 ctx->pos++;
155 }
156 mutex_unlock(&f->sem);
157 return 0;
158 }
159
160 /***********************************************************************/
161
162
jffs2_create(struct user_namespace * mnt_userns,struct inode * dir_i,struct dentry * dentry,umode_t mode,bool excl)163 static int jffs2_create(struct user_namespace *mnt_userns, struct inode *dir_i,
164 struct dentry *dentry, umode_t mode, bool excl)
165 {
166 struct jffs2_raw_inode *ri;
167 struct jffs2_inode_info *f, *dir_f;
168 struct jffs2_sb_info *c;
169 struct inode *inode;
170 int ret;
171
172 ri = jffs2_alloc_raw_inode();
173 if (!ri)
174 return -ENOMEM;
175
176 c = JFFS2_SB_INFO(dir_i->i_sb);
177
178 jffs2_dbg(1, "%s()\n", __func__);
179
180 inode = jffs2_new_inode(dir_i, mode, ri);
181
182 if (IS_ERR(inode)) {
183 jffs2_dbg(1, "jffs2_new_inode() failed\n");
184 jffs2_free_raw_inode(ri);
185 return PTR_ERR(inode);
186 }
187
188 inode->i_op = &jffs2_file_inode_operations;
189 inode->i_fop = &jffs2_file_operations;
190 inode->i_mapping->a_ops = &jffs2_file_address_operations;
191 inode->i_mapping->nrpages = 0;
192
193 f = JFFS2_INODE_INFO(inode);
194 dir_f = JFFS2_INODE_INFO(dir_i);
195
196 /* jffs2_do_create() will want to lock it, _after_ reserving
197 space and taking c-alloc_sem. If we keep it locked here,
198 lockdep gets unhappy (although it's a false positive;
199 nothing else will be looking at this inode yet so there's
200 no chance of AB-BA deadlock involving its f->sem). */
201 mutex_unlock(&f->sem);
202
203 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
204 if (ret)
205 goto fail;
206
207 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
208
209 jffs2_free_raw_inode(ri);
210
211 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
212 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
213 f->inocache->pino_nlink, inode->i_mapping->nrpages);
214
215 d_instantiate_new(dentry, inode);
216 return 0;
217
218 fail:
219 iget_failed(inode);
220 jffs2_free_raw_inode(ri);
221 return ret;
222 }
223
224 /***********************************************************************/
225
226
jffs2_unlink(struct inode * dir_i,struct dentry * dentry)227 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
228 {
229 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
230 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
231 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry));
232 int ret;
233 uint32_t now = JFFS2_NOW();
234
235 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
236 dentry->d_name.len, dead_f, now);
237 if (dead_f->inocache)
238 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink);
239 if (!ret)
240 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
241 return ret;
242 }
243 /***********************************************************************/
244
245
jffs2_link(struct dentry * old_dentry,struct inode * dir_i,struct dentry * dentry)246 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
247 {
248 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb);
249 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
250 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
251 int ret;
252 uint8_t type;
253 uint32_t now;
254
255 /* Don't let people make hard links to bad inodes. */
256 if (!f->inocache)
257 return -EIO;
258
259 if (d_is_dir(old_dentry))
260 return -EPERM;
261
262 /* XXX: This is ugly */
263 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
264 if (!type) type = DT_REG;
265
266 now = JFFS2_NOW();
267 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
268
269 if (!ret) {
270 mutex_lock(&f->sem);
271 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink);
272 mutex_unlock(&f->sem);
273 d_instantiate(dentry, d_inode(old_dentry));
274 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
275 ihold(d_inode(old_dentry));
276 }
277 return ret;
278 }
279
280 /***********************************************************************/
281
jffs2_symlink(struct user_namespace * mnt_userns,struct inode * dir_i,struct dentry * dentry,const char * target)282 static int jffs2_symlink (struct user_namespace *mnt_userns, struct inode *dir_i,
283 struct dentry *dentry, const char *target)
284 {
285 struct jffs2_inode_info *f, *dir_f;
286 struct jffs2_sb_info *c;
287 struct inode *inode;
288 struct jffs2_raw_inode *ri;
289 struct jffs2_raw_dirent *rd;
290 struct jffs2_full_dnode *fn;
291 struct jffs2_full_dirent *fd;
292 int namelen;
293 uint32_t alloclen;
294 int ret, targetlen = strlen(target);
295
296 /* FIXME: If you care. We'd need to use frags for the target
297 if it grows much more than this */
298 if (targetlen > 254)
299 return -ENAMETOOLONG;
300
301 ri = jffs2_alloc_raw_inode();
302
303 if (!ri)
304 return -ENOMEM;
305
306 c = JFFS2_SB_INFO(dir_i->i_sb);
307
308 /* Try to reserve enough space for both node and dirent.
309 * Just the node will do for now, though
310 */
311 namelen = dentry->d_name.len;
312 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
313 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
314
315 if (ret) {
316 jffs2_free_raw_inode(ri);
317 return ret;
318 }
319
320 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
321
322 if (IS_ERR(inode)) {
323 jffs2_free_raw_inode(ri);
324 jffs2_complete_reservation(c);
325 return PTR_ERR(inode);
326 }
327
328 inode->i_op = &jffs2_symlink_inode_operations;
329
330 f = JFFS2_INODE_INFO(inode);
331
332 inode->i_size = targetlen;
333 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
334 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
335 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
336
337 ri->compr = JFFS2_COMPR_NONE;
338 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
339 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
340
341 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
342
343 jffs2_free_raw_inode(ri);
344
345 if (IS_ERR(fn)) {
346 /* Eeek. Wave bye bye */
347 mutex_unlock(&f->sem);
348 jffs2_complete_reservation(c);
349 ret = PTR_ERR(fn);
350 goto fail;
351 }
352
353 /* We use f->target field to store the target path. */
354 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
355 if (!f->target) {
356 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
357 mutex_unlock(&f->sem);
358 jffs2_complete_reservation(c);
359 ret = -ENOMEM;
360 goto fail;
361 }
362 inode->i_link = f->target;
363
364 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
365 __func__, (char *)f->target);
366
367 /* No data here. Only a metadata node, which will be
368 obsoleted by the first data write
369 */
370 f->metadata = fn;
371 mutex_unlock(&f->sem);
372
373 jffs2_complete_reservation(c);
374
375 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
376 if (ret)
377 goto fail;
378
379 ret = jffs2_init_acl_post(inode);
380 if (ret)
381 goto fail;
382
383 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
384 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
385 if (ret)
386 goto fail;
387
388 rd = jffs2_alloc_raw_dirent();
389 if (!rd) {
390 /* Argh. Now we treat it like a normal delete */
391 jffs2_complete_reservation(c);
392 ret = -ENOMEM;
393 goto fail;
394 }
395
396 dir_f = JFFS2_INODE_INFO(dir_i);
397 mutex_lock(&dir_f->sem);
398
399 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
400 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
401 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
402 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
403
404 rd->pino = cpu_to_je32(dir_i->i_ino);
405 rd->version = cpu_to_je32(++dir_f->highest_version);
406 rd->ino = cpu_to_je32(inode->i_ino);
407 rd->mctime = cpu_to_je32(JFFS2_NOW());
408 rd->nsize = namelen;
409 rd->type = DT_LNK;
410 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
411 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
412
413 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
414
415 if (IS_ERR(fd)) {
416 /* dirent failed to write. Delete the inode normally
417 as if it were the final unlink() */
418 jffs2_complete_reservation(c);
419 jffs2_free_raw_dirent(rd);
420 mutex_unlock(&dir_f->sem);
421 ret = PTR_ERR(fd);
422 goto fail;
423 }
424
425 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
426
427 jffs2_free_raw_dirent(rd);
428
429 /* Link the fd into the inode's list, obsoleting an old
430 one if necessary. */
431 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
432
433 mutex_unlock(&dir_f->sem);
434 jffs2_complete_reservation(c);
435
436 d_instantiate_new(dentry, inode);
437 return 0;
438
439 fail:
440 iget_failed(inode);
441 return ret;
442 }
443
444
jffs2_mkdir(struct user_namespace * mnt_userns,struct inode * dir_i,struct dentry * dentry,umode_t mode)445 static int jffs2_mkdir (struct user_namespace *mnt_userns, struct inode *dir_i,
446 struct dentry *dentry, umode_t mode)
447 {
448 struct jffs2_inode_info *f, *dir_f;
449 struct jffs2_sb_info *c;
450 struct inode *inode;
451 struct jffs2_raw_inode *ri;
452 struct jffs2_raw_dirent *rd;
453 struct jffs2_full_dnode *fn;
454 struct jffs2_full_dirent *fd;
455 int namelen;
456 uint32_t alloclen;
457 int ret;
458
459 mode |= S_IFDIR;
460
461 ri = jffs2_alloc_raw_inode();
462 if (!ri)
463 return -ENOMEM;
464
465 c = JFFS2_SB_INFO(dir_i->i_sb);
466
467 /* Try to reserve enough space for both node and dirent.
468 * Just the node will do for now, though
469 */
470 namelen = dentry->d_name.len;
471 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
472 JFFS2_SUMMARY_INODE_SIZE);
473
474 if (ret) {
475 jffs2_free_raw_inode(ri);
476 return ret;
477 }
478
479 inode = jffs2_new_inode(dir_i, mode, ri);
480
481 if (IS_ERR(inode)) {
482 jffs2_free_raw_inode(ri);
483 jffs2_complete_reservation(c);
484 return PTR_ERR(inode);
485 }
486
487 inode->i_op = &jffs2_dir_inode_operations;
488 inode->i_fop = &jffs2_dir_operations;
489
490 f = JFFS2_INODE_INFO(inode);
491
492 /* Directories get nlink 2 at start */
493 set_nlink(inode, 2);
494 /* but ic->pino_nlink is the parent ino# */
495 f->inocache->pino_nlink = dir_i->i_ino;
496
497 ri->data_crc = cpu_to_je32(0);
498 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
499
500 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
501
502 jffs2_free_raw_inode(ri);
503
504 if (IS_ERR(fn)) {
505 /* Eeek. Wave bye bye */
506 mutex_unlock(&f->sem);
507 jffs2_complete_reservation(c);
508 ret = PTR_ERR(fn);
509 goto fail;
510 }
511 /* No data here. Only a metadata node, which will be
512 obsoleted by the first data write
513 */
514 f->metadata = fn;
515 mutex_unlock(&f->sem);
516
517 jffs2_complete_reservation(c);
518
519 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
520 if (ret)
521 goto fail;
522
523 ret = jffs2_init_acl_post(inode);
524 if (ret)
525 goto fail;
526
527 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
528 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
529 if (ret)
530 goto fail;
531
532 rd = jffs2_alloc_raw_dirent();
533 if (!rd) {
534 /* Argh. Now we treat it like a normal delete */
535 jffs2_complete_reservation(c);
536 ret = -ENOMEM;
537 goto fail;
538 }
539
540 dir_f = JFFS2_INODE_INFO(dir_i);
541 mutex_lock(&dir_f->sem);
542
543 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
544 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
545 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
546 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
547
548 rd->pino = cpu_to_je32(dir_i->i_ino);
549 rd->version = cpu_to_je32(++dir_f->highest_version);
550 rd->ino = cpu_to_je32(inode->i_ino);
551 rd->mctime = cpu_to_je32(JFFS2_NOW());
552 rd->nsize = namelen;
553 rd->type = DT_DIR;
554 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
555 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
556
557 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
558
559 if (IS_ERR(fd)) {
560 /* dirent failed to write. Delete the inode normally
561 as if it were the final unlink() */
562 jffs2_complete_reservation(c);
563 jffs2_free_raw_dirent(rd);
564 mutex_unlock(&dir_f->sem);
565 ret = PTR_ERR(fd);
566 goto fail;
567 }
568
569 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
570 inc_nlink(dir_i);
571
572 jffs2_free_raw_dirent(rd);
573
574 /* Link the fd into the inode's list, obsoleting an old
575 one if necessary. */
576 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
577
578 mutex_unlock(&dir_f->sem);
579 jffs2_complete_reservation(c);
580
581 d_instantiate_new(dentry, inode);
582 return 0;
583
584 fail:
585 iget_failed(inode);
586 return ret;
587 }
588
jffs2_rmdir(struct inode * dir_i,struct dentry * dentry)589 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
590 {
591 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
592 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
593 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry));
594 struct jffs2_full_dirent *fd;
595 int ret;
596 uint32_t now = JFFS2_NOW();
597
598 mutex_lock(&f->sem);
599 for (fd = f->dents ; fd; fd = fd->next) {
600 if (fd->ino) {
601 mutex_unlock(&f->sem);
602 return -ENOTEMPTY;
603 }
604 }
605 mutex_unlock(&f->sem);
606
607 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
608 dentry->d_name.len, f, now);
609 if (!ret) {
610 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
611 clear_nlink(d_inode(dentry));
612 drop_nlink(dir_i);
613 }
614 return ret;
615 }
616
jffs2_mknod(struct user_namespace * mnt_userns,struct inode * dir_i,struct dentry * dentry,umode_t mode,dev_t rdev)617 static int jffs2_mknod (struct user_namespace *mnt_userns, struct inode *dir_i,
618 struct dentry *dentry, umode_t mode, dev_t rdev)
619 {
620 struct jffs2_inode_info *f, *dir_f;
621 struct jffs2_sb_info *c;
622 struct inode *inode;
623 struct jffs2_raw_inode *ri;
624 struct jffs2_raw_dirent *rd;
625 struct jffs2_full_dnode *fn;
626 struct jffs2_full_dirent *fd;
627 int namelen;
628 union jffs2_device_node dev;
629 int devlen = 0;
630 uint32_t alloclen;
631 int ret;
632
633 ri = jffs2_alloc_raw_inode();
634 if (!ri)
635 return -ENOMEM;
636
637 c = JFFS2_SB_INFO(dir_i->i_sb);
638
639 if (S_ISBLK(mode) || S_ISCHR(mode))
640 devlen = jffs2_encode_dev(&dev, rdev);
641
642 /* Try to reserve enough space for both node and dirent.
643 * Just the node will do for now, though
644 */
645 namelen = dentry->d_name.len;
646 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
647 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
648
649 if (ret) {
650 jffs2_free_raw_inode(ri);
651 return ret;
652 }
653
654 inode = jffs2_new_inode(dir_i, mode, ri);
655
656 if (IS_ERR(inode)) {
657 jffs2_free_raw_inode(ri);
658 jffs2_complete_reservation(c);
659 return PTR_ERR(inode);
660 }
661 inode->i_op = &jffs2_file_inode_operations;
662 init_special_inode(inode, inode->i_mode, rdev);
663
664 f = JFFS2_INODE_INFO(inode);
665
666 ri->dsize = ri->csize = cpu_to_je32(devlen);
667 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
668 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
669
670 ri->compr = JFFS2_COMPR_NONE;
671 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
672 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
673
674 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
675
676 jffs2_free_raw_inode(ri);
677
678 if (IS_ERR(fn)) {
679 /* Eeek. Wave bye bye */
680 mutex_unlock(&f->sem);
681 jffs2_complete_reservation(c);
682 ret = PTR_ERR(fn);
683 goto fail;
684 }
685 /* No data here. Only a metadata node, which will be
686 obsoleted by the first data write
687 */
688 f->metadata = fn;
689 mutex_unlock(&f->sem);
690
691 jffs2_complete_reservation(c);
692
693 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
694 if (ret)
695 goto fail;
696
697 ret = jffs2_init_acl_post(inode);
698 if (ret)
699 goto fail;
700
701 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
702 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
703 if (ret)
704 goto fail;
705
706 rd = jffs2_alloc_raw_dirent();
707 if (!rd) {
708 /* Argh. Now we treat it like a normal delete */
709 jffs2_complete_reservation(c);
710 ret = -ENOMEM;
711 goto fail;
712 }
713
714 dir_f = JFFS2_INODE_INFO(dir_i);
715 mutex_lock(&dir_f->sem);
716
717 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
718 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
719 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
720 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
721
722 rd->pino = cpu_to_je32(dir_i->i_ino);
723 rd->version = cpu_to_je32(++dir_f->highest_version);
724 rd->ino = cpu_to_je32(inode->i_ino);
725 rd->mctime = cpu_to_je32(JFFS2_NOW());
726 rd->nsize = namelen;
727
728 /* XXX: This is ugly. */
729 rd->type = (mode & S_IFMT) >> 12;
730
731 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
732 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
733
734 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
735
736 if (IS_ERR(fd)) {
737 /* dirent failed to write. Delete the inode normally
738 as if it were the final unlink() */
739 jffs2_complete_reservation(c);
740 jffs2_free_raw_dirent(rd);
741 mutex_unlock(&dir_f->sem);
742 ret = PTR_ERR(fd);
743 goto fail;
744 }
745
746 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
747
748 jffs2_free_raw_dirent(rd);
749
750 /* Link the fd into the inode's list, obsoleting an old
751 one if necessary. */
752 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
753
754 mutex_unlock(&dir_f->sem);
755 jffs2_complete_reservation(c);
756
757 d_instantiate_new(dentry, inode);
758 return 0;
759
760 fail:
761 iget_failed(inode);
762 return ret;
763 }
764
jffs2_rename(struct user_namespace * mnt_userns,struct inode * old_dir_i,struct dentry * old_dentry,struct inode * new_dir_i,struct dentry * new_dentry,unsigned int flags)765 static int jffs2_rename (struct user_namespace *mnt_userns,
766 struct inode *old_dir_i, struct dentry *old_dentry,
767 struct inode *new_dir_i, struct dentry *new_dentry,
768 unsigned int flags)
769 {
770 int ret;
771 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
772 struct jffs2_inode_info *victim_f = NULL;
773 uint8_t type;
774 uint32_t now;
775
776 if (flags & ~RENAME_NOREPLACE)
777 return -EINVAL;
778
779 /* The VFS will check for us and prevent trying to rename a
780 * file over a directory and vice versa, but if it's a directory,
781 * the VFS can't check whether the victim is empty. The filesystem
782 * needs to do that for itself.
783 */
784 if (d_really_is_positive(new_dentry)) {
785 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry));
786 if (d_is_dir(new_dentry)) {
787 struct jffs2_full_dirent *fd;
788
789 mutex_lock(&victim_f->sem);
790 for (fd = victim_f->dents; fd; fd = fd->next) {
791 if (fd->ino) {
792 mutex_unlock(&victim_f->sem);
793 return -ENOTEMPTY;
794 }
795 }
796 mutex_unlock(&victim_f->sem);
797 }
798 }
799
800 /* XXX: We probably ought to alloc enough space for
801 both nodes at the same time. Writing the new link,
802 then getting -ENOSPC, is quite bad :)
803 */
804
805 /* Make a hard link */
806
807 /* XXX: This is ugly */
808 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12;
809 if (!type) type = DT_REG;
810
811 now = JFFS2_NOW();
812 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
813 d_inode(old_dentry)->i_ino, type,
814 new_dentry->d_name.name, new_dentry->d_name.len, now);
815
816 if (ret)
817 return ret;
818
819 if (victim_f) {
820 /* There was a victim. Kill it off nicely */
821 if (d_is_dir(new_dentry))
822 clear_nlink(d_inode(new_dentry));
823 else
824 drop_nlink(d_inode(new_dentry));
825 /* Don't oops if the victim was a dirent pointing to an
826 inode which didn't exist. */
827 if (victim_f->inocache) {
828 mutex_lock(&victim_f->sem);
829 if (d_is_dir(new_dentry))
830 victim_f->inocache->pino_nlink = 0;
831 else
832 victim_f->inocache->pino_nlink--;
833 mutex_unlock(&victim_f->sem);
834 }
835 }
836
837 /* If it was a directory we moved, and there was no victim,
838 increase i_nlink on its new parent */
839 if (d_is_dir(old_dentry) && !victim_f)
840 inc_nlink(new_dir_i);
841
842 /* Unlink the original */
843 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
844 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
845
846 /* We don't touch inode->i_nlink */
847
848 if (ret) {
849 /* Oh shit. We really ought to make a single node which can do both atomically */
850 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry));
851 mutex_lock(&f->sem);
852 inc_nlink(d_inode(old_dentry));
853 if (f->inocache && !d_is_dir(old_dentry))
854 f->inocache->pino_nlink++;
855 mutex_unlock(&f->sem);
856
857 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
858 __func__, ret);
859 /*
860 * We can't keep the target in dcache after that.
861 * For one thing, we can't afford dentry aliases for directories.
862 * For another, if there was a victim, we _can't_ set new inode
863 * for that sucker and we have to trigger mount eviction - the
864 * caller won't do it on its own since we are returning an error.
865 */
866 d_invalidate(new_dentry);
867 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
868 return ret;
869 }
870
871 if (d_is_dir(old_dentry))
872 drop_nlink(old_dir_i);
873
874 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
875
876 return 0;
877 }
878
879