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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 | * | |
182ec4ee | 10 | * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/crc32.h> | |
18 | #include <linux/jffs2.h> | |
cbb9a561 DW |
19 | #include "jffs2_fs_i.h" |
20 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
21 | #include <linux/time.h> |
22 | #include "nodelist.h" | |
23 | ||
1da177e4 LT |
24 | static int jffs2_readdir (struct file *, void *, filldir_t); |
25 | ||
26 | static int jffs2_create (struct inode *,struct dentry *,int, | |
27 | struct nameidata *); | |
28 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, | |
29 | struct nameidata *); | |
30 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); | |
31 | static int jffs2_unlink (struct inode *,struct dentry *); | |
32 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
33 | static int jffs2_mkdir (struct inode *,struct dentry *,int); | |
34 | static int jffs2_rmdir (struct inode *,struct dentry *); | |
265489f0 | 35 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
1da177e4 LT |
36 | static int jffs2_rename (struct inode *, struct dentry *, |
37 | struct inode *, struct dentry *); | |
38 | ||
4b6f5d20 | 39 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
40 | { |
41 | .read = generic_read_dir, | |
42 | .readdir = jffs2_readdir, | |
43 | .ioctl = jffs2_ioctl, | |
44 | .fsync = jffs2_fsync | |
45 | }; | |
46 | ||
47 | ||
92e1d5be | 48 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 49 | { |
265489f0 DW |
50 | .create = jffs2_create, |
51 | .lookup = jffs2_lookup, | |
1da177e4 LT |
52 | .link = jffs2_link, |
53 | .unlink = jffs2_unlink, | |
54 | .symlink = jffs2_symlink, | |
55 | .mkdir = jffs2_mkdir, | |
56 | .rmdir = jffs2_rmdir, | |
57 | .mknod = jffs2_mknod, | |
58 | .rename = jffs2_rename, | |
aa98d7cf | 59 | .permission = jffs2_permission, |
1da177e4 | 60 | .setattr = jffs2_setattr, |
aa98d7cf KK |
61 | .setxattr = jffs2_setxattr, |
62 | .getxattr = jffs2_getxattr, | |
63 | .listxattr = jffs2_listxattr, | |
64 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
65 | }; |
66 | ||
67 | /***********************************************************************/ | |
68 | ||
69 | ||
70 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 71 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
72 | nice and simple |
73 | */ | |
74 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
75 | struct nameidata *nd) | |
76 | { | |
77 | struct jffs2_inode_info *dir_f; | |
78 | struct jffs2_sb_info *c; | |
79 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
80 | uint32_t ino = 0; | |
81 | struct inode *inode = NULL; | |
82 | ||
83 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
84 | ||
373d5e71 RP |
85 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
86 | return ERR_PTR(-ENAMETOOLONG); | |
87 | ||
1da177e4 LT |
88 | dir_f = JFFS2_INODE_INFO(dir_i); |
89 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
90 | ||
91 | down(&dir_f->sem); | |
92 | ||
93 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
94 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 95 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
96 | (!fd || fd_list->version > fd->version) && |
97 | strlen(fd_list->name) == target->d_name.len && | |
98 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
99 | fd = fd_list; | |
100 | } | |
101 | } | |
102 | if (fd) | |
103 | ino = fd->ino; | |
104 | up(&dir_f->sem); | |
105 | if (ino) { | |
106 | inode = iget(dir_i->i_sb, ino); | |
107 | if (!inode) { | |
108 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); | |
109 | return (ERR_PTR(-EIO)); | |
110 | } | |
111 | } | |
112 | ||
113 | d_add(target, inode); | |
114 | ||
115 | return NULL; | |
116 | } | |
117 | ||
118 | /***********************************************************************/ | |
119 | ||
120 | ||
121 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
122 | { | |
123 | struct jffs2_inode_info *f; | |
124 | struct jffs2_sb_info *c; | |
ec2e203c | 125 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
126 | struct jffs2_full_dirent *fd; |
127 | unsigned long offset, curofs; | |
128 | ||
ec2e203c | 129 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
130 | |
131 | f = JFFS2_INODE_INFO(inode); | |
132 | c = JFFS2_SB_INFO(inode->i_sb); | |
133 | ||
134 | offset = filp->f_pos; | |
135 | ||
136 | if (offset == 0) { | |
137 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
138 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
139 | goto out; | |
140 | offset++; | |
141 | } | |
142 | if (offset == 1) { | |
ec2e203c | 143 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
144 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
145 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
146 | goto out; | |
147 | offset++; | |
148 | } | |
149 | ||
150 | curofs=1; | |
151 | down(&f->sem); | |
152 | for (fd = f->dents; fd; fd = fd->next) { | |
153 | ||
154 | curofs++; | |
155 | /* First loop: curofs = 2; offset = 2 */ | |
156 | if (curofs < offset) { | |
182ec4ee | 157 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
158 | fd->name, fd->ino, fd->type, curofs, offset)); |
159 | continue; | |
160 | } | |
161 | if (!fd->ino) { | |
162 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
163 | offset++; | |
164 | continue; | |
165 | } | |
166 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
167 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
168 | break; | |
169 | offset++; | |
170 | } | |
171 | up(&f->sem); | |
172 | out: | |
173 | filp->f_pos = offset; | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /***********************************************************************/ | |
178 | ||
179 | ||
180 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
181 | struct nameidata *nd) | |
182 | { | |
183 | struct jffs2_raw_inode *ri; | |
184 | struct jffs2_inode_info *f, *dir_f; | |
185 | struct jffs2_sb_info *c; | |
186 | struct inode *inode; | |
187 | int ret; | |
188 | ||
189 | ri = jffs2_alloc_raw_inode(); | |
190 | if (!ri) | |
191 | return -ENOMEM; | |
182ec4ee | 192 | |
1da177e4 LT |
193 | c = JFFS2_SB_INFO(dir_i->i_sb); |
194 | ||
195 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
196 | ||
197 | inode = jffs2_new_inode(dir_i, mode, ri); | |
198 | ||
199 | if (IS_ERR(inode)) { | |
200 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
201 | jffs2_free_raw_inode(ri); | |
202 | return PTR_ERR(inode); | |
203 | } | |
204 | ||
205 | inode->i_op = &jffs2_file_inode_operations; | |
206 | inode->i_fop = &jffs2_file_operations; | |
207 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
208 | inode->i_mapping->nrpages = 0; | |
209 | ||
210 | f = JFFS2_INODE_INFO(inode); | |
211 | dir_f = JFFS2_INODE_INFO(dir_i); | |
212 | ||
182ec4ee | 213 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 LT |
214 | dentry->d_name.name, dentry->d_name.len); |
215 | ||
aa98d7cf KK |
216 | if (ret) |
217 | goto fail; | |
218 | ||
219 | ret = jffs2_init_security(inode, dir_i); | |
220 | if (ret) | |
221 | goto fail; | |
222 | ret = jffs2_init_acl(inode, dir_i); | |
223 | if (ret) | |
224 | goto fail; | |
1da177e4 LT |
225 | |
226 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
227 | ||
228 | jffs2_free_raw_inode(ri); | |
229 | d_instantiate(dentry, inode); | |
230 | ||
231 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
232 | inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); | |
233 | return 0; | |
aa98d7cf KK |
234 | |
235 | fail: | |
236 | make_bad_inode(inode); | |
237 | iput(inode); | |
238 | jffs2_free_raw_inode(ri); | |
239 | return ret; | |
1da177e4 LT |
240 | } |
241 | ||
242 | /***********************************************************************/ | |
243 | ||
244 | ||
245 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
246 | { | |
247 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
248 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
249 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
250 | int ret; | |
3a69e0cd | 251 | uint32_t now = get_seconds(); |
1da177e4 | 252 | |
182ec4ee | 253 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 254 | dentry->d_name.len, dead_f, now); |
1da177e4 LT |
255 | if (dead_f->inocache) |
256 | dentry->d_inode->i_nlink = dead_f->inocache->nlink; | |
3a69e0cd AB |
257 | if (!ret) |
258 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
259 | return ret; |
260 | } | |
261 | /***********************************************************************/ | |
262 | ||
263 | ||
264 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
265 | { | |
266 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
267 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
268 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
269 | int ret; | |
270 | uint8_t type; | |
3a69e0cd | 271 | uint32_t now; |
1da177e4 LT |
272 | |
273 | /* Don't let people make hard links to bad inodes. */ | |
274 | if (!f->inocache) | |
275 | return -EIO; | |
276 | ||
277 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
278 | return -EPERM; | |
279 | ||
280 | /* XXX: This is ugly */ | |
281 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
282 | if (!type) type = DT_REG; | |
283 | ||
3a69e0cd AB |
284 | now = get_seconds(); |
285 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
286 | |
287 | if (!ret) { | |
288 | down(&f->sem); | |
289 | old_dentry->d_inode->i_nlink = ++f->inocache->nlink; | |
290 | up(&f->sem); | |
291 | d_instantiate(dentry, old_dentry->d_inode); | |
3a69e0cd | 292 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
293 | atomic_inc(&old_dentry->d_inode->i_count); |
294 | } | |
295 | return ret; | |
296 | } | |
297 | ||
298 | /***********************************************************************/ | |
299 | ||
300 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
301 | { | |
302 | struct jffs2_inode_info *f, *dir_f; | |
303 | struct jffs2_sb_info *c; | |
304 | struct inode *inode; | |
305 | struct jffs2_raw_inode *ri; | |
306 | struct jffs2_raw_dirent *rd; | |
307 | struct jffs2_full_dnode *fn; | |
308 | struct jffs2_full_dirent *fd; | |
309 | int namelen; | |
9fe4854c | 310 | uint32_t alloclen; |
32f1a95d | 311 | int ret, targetlen = strlen(target); |
1da177e4 LT |
312 | |
313 | /* FIXME: If you care. We'd need to use frags for the target | |
314 | if it grows much more than this */ | |
32f1a95d | 315 | if (targetlen > 254) |
1da177e4 LT |
316 | return -EINVAL; |
317 | ||
318 | ri = jffs2_alloc_raw_inode(); | |
319 | ||
320 | if (!ri) | |
321 | return -ENOMEM; | |
182ec4ee | 322 | |
1da177e4 | 323 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
324 | |
325 | /* Try to reserve enough space for both node and dirent. | |
326 | * Just the node will do for now, though | |
1da177e4 LT |
327 | */ |
328 | namelen = dentry->d_name.len; | |
9fe4854c DW |
329 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
330 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
331 | |
332 | if (ret) { | |
333 | jffs2_free_raw_inode(ri); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); | |
338 | ||
339 | if (IS_ERR(inode)) { | |
340 | jffs2_free_raw_inode(ri); | |
341 | jffs2_complete_reservation(c); | |
342 | return PTR_ERR(inode); | |
343 | } | |
344 | ||
345 | inode->i_op = &jffs2_symlink_inode_operations; | |
346 | ||
347 | f = JFFS2_INODE_INFO(inode); | |
348 | ||
32f1a95d | 349 | inode->i_size = targetlen; |
1da177e4 LT |
350 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
351 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
352 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
353 | ||
354 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 355 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 356 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 357 | |
9fe4854c | 358 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
359 | |
360 | jffs2_free_raw_inode(ri); | |
361 | ||
362 | if (IS_ERR(fn)) { | |
363 | /* Eeek. Wave bye bye */ | |
364 | up(&f->sem); | |
365 | jffs2_complete_reservation(c); | |
366 | jffs2_clear_inode(inode); | |
367 | return PTR_ERR(fn); | |
368 | } | |
32f1a95d | 369 | |
2b79adcc AB |
370 | /* We use f->target field to store the target path. */ |
371 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); | |
372 | if (!f->target) { | |
32f1a95d AB |
373 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
374 | up(&f->sem); | |
375 | jffs2_complete_reservation(c); | |
376 | jffs2_clear_inode(inode); | |
377 | return -ENOMEM; | |
378 | } | |
379 | ||
2b79adcc AB |
380 | memcpy(f->target, target, targetlen + 1); |
381 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); | |
32f1a95d | 382 | |
182ec4ee | 383 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
384 | obsoleted by the first data write |
385 | */ | |
386 | f->metadata = fn; | |
387 | up(&f->sem); | |
388 | ||
389 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
390 | |
391 | ret = jffs2_init_security(inode, dir_i); | |
392 | if (ret) { | |
393 | jffs2_clear_inode(inode); | |
394 | return ret; | |
395 | } | |
396 | ret = jffs2_init_acl(inode, dir_i); | |
397 | if (ret) { | |
398 | jffs2_clear_inode(inode); | |
399 | return ret; | |
400 | } | |
401 | ||
9fe4854c DW |
402 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
403 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
404 | if (ret) { |
405 | /* Eep. */ | |
406 | jffs2_clear_inode(inode); | |
407 | return ret; | |
408 | } | |
409 | ||
410 | rd = jffs2_alloc_raw_dirent(); | |
411 | if (!rd) { | |
412 | /* Argh. Now we treat it like a normal delete */ | |
413 | jffs2_complete_reservation(c); | |
414 | jffs2_clear_inode(inode); | |
415 | return -ENOMEM; | |
416 | } | |
417 | ||
418 | dir_f = JFFS2_INODE_INFO(dir_i); | |
419 | down(&dir_f->sem); | |
420 | ||
421 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
422 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
423 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
424 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
425 | ||
426 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
427 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
428 | rd->ino = cpu_to_je32(inode->i_ino); | |
429 | rd->mctime = cpu_to_je32(get_seconds()); | |
430 | rd->nsize = namelen; | |
431 | rd->type = DT_LNK; | |
432 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
433 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
434 | ||
9fe4854c | 435 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
436 | |
437 | if (IS_ERR(fd)) { | |
182ec4ee | 438 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
439 | as if it were the final unlink() */ |
440 | jffs2_complete_reservation(c); | |
441 | jffs2_free_raw_dirent(rd); | |
442 | up(&dir_f->sem); | |
443 | jffs2_clear_inode(inode); | |
444 | return PTR_ERR(fd); | |
445 | } | |
446 | ||
447 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
448 | ||
449 | jffs2_free_raw_dirent(rd); | |
450 | ||
451 | /* Link the fd into the inode's list, obsoleting an old | |
452 | one if necessary. */ | |
453 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
454 | ||
455 | up(&dir_f->sem); | |
456 | jffs2_complete_reservation(c); | |
457 | ||
458 | d_instantiate(dentry, inode); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | ||
463 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
464 | { | |
465 | struct jffs2_inode_info *f, *dir_f; | |
466 | struct jffs2_sb_info *c; | |
467 | struct inode *inode; | |
468 | struct jffs2_raw_inode *ri; | |
469 | struct jffs2_raw_dirent *rd; | |
470 | struct jffs2_full_dnode *fn; | |
471 | struct jffs2_full_dirent *fd; | |
472 | int namelen; | |
9fe4854c | 473 | uint32_t alloclen; |
1da177e4 LT |
474 | int ret; |
475 | ||
476 | mode |= S_IFDIR; | |
477 | ||
478 | ri = jffs2_alloc_raw_inode(); | |
479 | if (!ri) | |
480 | return -ENOMEM; | |
182ec4ee | 481 | |
1da177e4 LT |
482 | c = JFFS2_SB_INFO(dir_i->i_sb); |
483 | ||
182ec4ee TG |
484 | /* Try to reserve enough space for both node and dirent. |
485 | * Just the node will do for now, though | |
1da177e4 LT |
486 | */ |
487 | namelen = dentry->d_name.len; | |
9fe4854c DW |
488 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
489 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
490 | |
491 | if (ret) { | |
492 | jffs2_free_raw_inode(ri); | |
493 | return ret; | |
494 | } | |
495 | ||
496 | inode = jffs2_new_inode(dir_i, mode, ri); | |
497 | ||
498 | if (IS_ERR(inode)) { | |
499 | jffs2_free_raw_inode(ri); | |
500 | jffs2_complete_reservation(c); | |
501 | return PTR_ERR(inode); | |
502 | } | |
503 | ||
504 | inode->i_op = &jffs2_dir_inode_operations; | |
505 | inode->i_fop = &jffs2_dir_operations; | |
506 | /* Directories get nlink 2 at start */ | |
507 | inode->i_nlink = 2; | |
508 | ||
509 | f = JFFS2_INODE_INFO(inode); | |
510 | ||
511 | ri->data_crc = cpu_to_je32(0); | |
512 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 513 | |
9fe4854c | 514 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
515 | |
516 | jffs2_free_raw_inode(ri); | |
517 | ||
518 | if (IS_ERR(fn)) { | |
519 | /* Eeek. Wave bye bye */ | |
520 | up(&f->sem); | |
521 | jffs2_complete_reservation(c); | |
522 | jffs2_clear_inode(inode); | |
523 | return PTR_ERR(fn); | |
524 | } | |
182ec4ee | 525 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
526 | obsoleted by the first data write |
527 | */ | |
528 | f->metadata = fn; | |
529 | up(&f->sem); | |
530 | ||
531 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
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(inode, dir_i); | |
539 | if (ret) { | |
540 | jffs2_clear_inode(inode); | |
541 | return ret; | |
542 | } | |
543 | ||
9fe4854c DW |
544 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
545 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
546 | if (ret) { |
547 | /* Eep. */ | |
548 | jffs2_clear_inode(inode); | |
549 | return ret; | |
550 | } | |
182ec4ee | 551 | |
1da177e4 LT |
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 | down(&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 | ||
9fe4854c | 577 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 578 | |
1da177e4 | 579 | if (IS_ERR(fd)) { |
182ec4ee | 580 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
581 | as if it were the final unlink() */ |
582 | jffs2_complete_reservation(c); | |
583 | jffs2_free_raw_dirent(rd); | |
584 | up(&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)); | |
d8c76e6f | 590 | inc_nlink(dir_i); |
1da177e4 LT |
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 | up(&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_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); | |
608 | struct jffs2_full_dirent *fd; | |
609 | int ret; | |
610 | ||
611 | for (fd = f->dents ; fd; fd = fd->next) { | |
612 | if (fd->ino) | |
613 | return -ENOTEMPTY; | |
614 | } | |
615 | ret = jffs2_unlink(dir_i, dentry); | |
616 | if (!ret) | |
9a53c3a7 | 617 | drop_nlink(dir_i); |
1da177e4 LT |
618 | return ret; |
619 | } | |
620 | ||
265489f0 | 621 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
622 | { |
623 | struct jffs2_inode_info *f, *dir_f; | |
624 | struct jffs2_sb_info *c; | |
625 | struct inode *inode; | |
626 | struct jffs2_raw_inode *ri; | |
627 | struct jffs2_raw_dirent *rd; | |
628 | struct jffs2_full_dnode *fn; | |
629 | struct jffs2_full_dirent *fd; | |
630 | int namelen; | |
aef9ab47 | 631 | union jffs2_device_node dev; |
1da177e4 | 632 | int devlen = 0; |
9fe4854c | 633 | uint32_t alloclen; |
1da177e4 LT |
634 | int ret; |
635 | ||
aef9ab47 | 636 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
637 | return -EINVAL; |
638 | ||
639 | ri = jffs2_alloc_raw_inode(); | |
640 | if (!ri) | |
641 | return -ENOMEM; | |
182ec4ee | 642 | |
1da177e4 | 643 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 644 | |
aef9ab47 DW |
645 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
646 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
647 | |
648 | /* Try to reserve enough space for both node and dirent. | |
649 | * Just the node will do for now, though | |
1da177e4 LT |
650 | */ |
651 | namelen = dentry->d_name.len; | |
9fe4854c | 652 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 653 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
654 | |
655 | if (ret) { | |
656 | jffs2_free_raw_inode(ri); | |
657 | return ret; | |
658 | } | |
659 | ||
660 | inode = jffs2_new_inode(dir_i, mode, ri); | |
661 | ||
662 | if (IS_ERR(inode)) { | |
663 | jffs2_free_raw_inode(ri); | |
664 | jffs2_complete_reservation(c); | |
665 | return PTR_ERR(inode); | |
666 | } | |
667 | inode->i_op = &jffs2_file_inode_operations; | |
668 | init_special_inode(inode, inode->i_mode, rdev); | |
669 | ||
670 | f = JFFS2_INODE_INFO(inode); | |
671 | ||
672 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
673 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
674 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
675 | ||
676 | ri->compr = JFFS2_COMPR_NONE; | |
677 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
678 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 679 | |
9fe4854c | 680 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
681 | |
682 | jffs2_free_raw_inode(ri); | |
683 | ||
684 | if (IS_ERR(fn)) { | |
685 | /* Eeek. Wave bye bye */ | |
686 | up(&f->sem); | |
687 | jffs2_complete_reservation(c); | |
688 | jffs2_clear_inode(inode); | |
689 | return PTR_ERR(fn); | |
690 | } | |
182ec4ee | 691 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
692 | obsoleted by the first data write |
693 | */ | |
694 | f->metadata = fn; | |
695 | up(&f->sem); | |
696 | ||
697 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
698 | |
699 | ret = jffs2_init_security(inode, dir_i); | |
700 | if (ret) { | |
701 | jffs2_clear_inode(inode); | |
702 | return ret; | |
703 | } | |
704 | ret = jffs2_init_acl(inode, dir_i); | |
705 | if (ret) { | |
706 | jffs2_clear_inode(inode); | |
707 | return ret; | |
708 | } | |
709 | ||
9fe4854c DW |
710 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
711 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
712 | if (ret) { |
713 | /* Eep. */ | |
714 | jffs2_clear_inode(inode); | |
715 | return ret; | |
716 | } | |
717 | ||
718 | rd = jffs2_alloc_raw_dirent(); | |
719 | if (!rd) { | |
720 | /* Argh. Now we treat it like a normal delete */ | |
721 | jffs2_complete_reservation(c); | |
722 | jffs2_clear_inode(inode); | |
723 | return -ENOMEM; | |
724 | } | |
725 | ||
726 | dir_f = JFFS2_INODE_INFO(dir_i); | |
727 | down(&dir_f->sem); | |
728 | ||
729 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
730 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
731 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
732 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
733 | ||
734 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
735 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
736 | rd->ino = cpu_to_je32(inode->i_ino); | |
737 | rd->mctime = cpu_to_je32(get_seconds()); | |
738 | rd->nsize = namelen; | |
739 | ||
740 | /* XXX: This is ugly. */ | |
741 | rd->type = (mode & S_IFMT) >> 12; | |
742 | ||
743 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
744 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
745 | ||
9fe4854c | 746 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 747 | |
1da177e4 | 748 | if (IS_ERR(fd)) { |
182ec4ee | 749 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
750 | as if it were the final unlink() */ |
751 | jffs2_complete_reservation(c); | |
752 | jffs2_free_raw_dirent(rd); | |
753 | up(&dir_f->sem); | |
754 | jffs2_clear_inode(inode); | |
755 | return PTR_ERR(fd); | |
756 | } | |
757 | ||
758 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
759 | ||
760 | jffs2_free_raw_dirent(rd); | |
761 | ||
762 | /* Link the fd into the inode's list, obsoleting an old | |
763 | one if necessary. */ | |
764 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
765 | ||
766 | up(&dir_f->sem); | |
767 | jffs2_complete_reservation(c); | |
768 | ||
769 | d_instantiate(dentry, inode); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
775 | struct inode *new_dir_i, struct dentry *new_dentry) | |
776 | { | |
777 | int ret; | |
778 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
779 | struct jffs2_inode_info *victim_f = NULL; | |
780 | uint8_t type; | |
3a69e0cd | 781 | uint32_t now; |
1da177e4 | 782 | |
182ec4ee | 783 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
784 | * file over a directory and vice versa, but if it's a directory, |
785 | * the VFS can't check whether the victim is empty. The filesystem | |
786 | * needs to do that for itself. | |
787 | */ | |
788 | if (new_dentry->d_inode) { | |
789 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
790 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
791 | struct jffs2_full_dirent *fd; | |
792 | ||
793 | down(&victim_f->sem); | |
794 | for (fd = victim_f->dents; fd; fd = fd->next) { | |
795 | if (fd->ino) { | |
796 | up(&victim_f->sem); | |
797 | return -ENOTEMPTY; | |
798 | } | |
799 | } | |
800 | up(&victim_f->sem); | |
801 | } | |
802 | } | |
803 | ||
804 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 805 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
806 | then getting -ENOSPC, is quite bad :) |
807 | */ | |
808 | ||
809 | /* Make a hard link */ | |
182ec4ee | 810 | |
1da177e4 LT |
811 | /* XXX: This is ugly */ |
812 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
813 | if (!type) type = DT_REG; | |
814 | ||
3a69e0cd | 815 | now = get_seconds(); |
182ec4ee | 816 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 817 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 818 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
819 | |
820 | if (ret) | |
821 | return ret; | |
822 | ||
823 | if (victim_f) { | |
824 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 825 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
826 | /* Don't oops if the victim was a dirent pointing to an |
827 | inode which didn't exist. */ | |
828 | if (victim_f->inocache) { | |
829 | down(&victim_f->sem); | |
830 | victim_f->inocache->nlink--; | |
831 | up(&victim_f->sem); | |
832 | } | |
833 | } | |
834 | ||
182ec4ee | 835 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
836 | increase i_nlink on its new parent */ |
837 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 838 | inc_nlink(new_dir_i); |
1da177e4 LT |
839 | |
840 | /* Unlink the original */ | |
182ec4ee | 841 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 842 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
843 | |
844 | /* We don't touch inode->i_nlink */ | |
845 | ||
846 | if (ret) { | |
847 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
848 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
849 | down(&f->sem); | |
d8c76e6f | 850 | inc_nlink(old_dentry->d_inode); |
1da177e4 LT |
851 | if (f->inocache) |
852 | f->inocache->nlink++; | |
853 | up(&f->sem); | |
854 | ||
855 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
856 | /* Might as well let the VFS know */ | |
857 | d_instantiate(new_dentry, old_dentry->d_inode); | |
858 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 859 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
860 | return ret; |
861 | } | |
862 | ||
863 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 864 | drop_nlink(old_dir_i); |
1da177e4 | 865 | |
3a69e0cd AB |
866 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
867 | ||
1da177e4 LT |
868 | return 0; |
869 | } | |
870 |