Commit | Line | Data |
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1da177e4 LT |
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 | * | |
265489f0 | 10 | * $Id: dir.c,v 1.86 2005/07/06 12:13:09 dwmw2 Exp $ |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 *); | |
265489f0 | 36 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
1da177e4 LT |
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 | { | |
265489f0 DW |
51 | .create = jffs2_create, |
52 | .lookup = jffs2_lookup, | |
1da177e4 LT |
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; | |
32f1a95d | 289 | int ret, targetlen = strlen(target); |
1da177e4 LT |
290 | |
291 | /* FIXME: If you care. We'd need to use frags for the target | |
292 | if it grows much more than this */ | |
32f1a95d | 293 | if (targetlen > 254) |
1da177e4 LT |
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; | |
32f1a95d | 307 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL); |
1da177e4 LT |
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 | ||
32f1a95d | 326 | inode->i_size = targetlen; |
1da177e4 LT |
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; | |
32f1a95d | 332 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 LT |
333 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
334 | ||
32f1a95d | 335 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL); |
1da177e4 LT |
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 | } | |
32f1a95d AB |
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 | ||
1da177e4 LT |
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 | ||
265489f0 | 571 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
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 |