Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
1da177e4 LT |
14 | #include <linux/fs.h> |
15 | #include <linux/crc32.h> | |
16 | #include <linux/jffs2.h> | |
cbb9a561 DW |
17 | #include "jffs2_fs_i.h" |
18 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
19 | #include <linux/time.h> |
20 | #include "nodelist.h" | |
21 | ||
1da177e4 LT |
22 | static int jffs2_readdir (struct file *, void *, filldir_t); |
23 | ||
24 | static int jffs2_create (struct inode *,struct dentry *,int, | |
25 | struct nameidata *); | |
26 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, | |
27 | struct nameidata *); | |
28 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); | |
29 | static int jffs2_unlink (struct inode *,struct dentry *); | |
30 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
31 | static int jffs2_mkdir (struct inode *,struct dentry *,int); | |
32 | static int jffs2_rmdir (struct inode *,struct dentry *); | |
265489f0 | 33 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
1da177e4 | 34 | static int jffs2_rename (struct inode *, struct dentry *, |
ef53cb02 | 35 | struct inode *, struct dentry *); |
1da177e4 | 36 | |
4b6f5d20 | 37 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
38 | { |
39 | .read = generic_read_dir, | |
40 | .readdir = jffs2_readdir, | |
41 | .ioctl = jffs2_ioctl, | |
42 | .fsync = jffs2_fsync | |
43 | }; | |
44 | ||
45 | ||
92e1d5be | 46 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 47 | { |
265489f0 DW |
48 | .create = jffs2_create, |
49 | .lookup = jffs2_lookup, | |
1da177e4 LT |
50 | .link = jffs2_link, |
51 | .unlink = jffs2_unlink, | |
52 | .symlink = jffs2_symlink, | |
53 | .mkdir = jffs2_mkdir, | |
54 | .rmdir = jffs2_rmdir, | |
55 | .mknod = jffs2_mknod, | |
56 | .rename = jffs2_rename, | |
aa98d7cf | 57 | .permission = jffs2_permission, |
1da177e4 | 58 | .setattr = jffs2_setattr, |
aa98d7cf KK |
59 | .setxattr = jffs2_setxattr, |
60 | .getxattr = jffs2_getxattr, | |
61 | .listxattr = jffs2_listxattr, | |
62 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
63 | }; |
64 | ||
65 | /***********************************************************************/ | |
66 | ||
67 | ||
68 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 69 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
70 | nice and simple |
71 | */ | |
72 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
73 | struct nameidata *nd) | |
74 | { | |
75 | struct jffs2_inode_info *dir_f; | |
76 | struct jffs2_sb_info *c; | |
77 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
78 | uint32_t ino = 0; | |
79 | struct inode *inode = NULL; | |
80 | ||
81 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
82 | ||
373d5e71 RP |
83 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
84 | return ERR_PTR(-ENAMETOOLONG); | |
85 | ||
1da177e4 LT |
86 | dir_f = JFFS2_INODE_INFO(dir_i); |
87 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
88 | ||
ced22070 | 89 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
90 | |
91 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
92 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 93 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
94 | (!fd || fd_list->version > fd->version) && |
95 | strlen(fd_list->name) == target->d_name.len && | |
96 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
97 | fd = fd_list; | |
98 | } | |
99 | } | |
100 | if (fd) | |
101 | ino = fd->ino; | |
ced22070 | 102 | mutex_unlock(&dir_f->sem); |
1da177e4 | 103 | if (ino) { |
5451f79f DH |
104 | inode = jffs2_iget(dir_i->i_sb, ino); |
105 | if (IS_ERR(inode)) { | |
1da177e4 | 106 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
5451f79f | 107 | return ERR_CAST(inode); |
1da177e4 LT |
108 | } |
109 | } | |
110 | ||
111 | d_add(target, inode); | |
112 | ||
113 | return NULL; | |
114 | } | |
115 | ||
116 | /***********************************************************************/ | |
117 | ||
118 | ||
119 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
120 | { | |
121 | struct jffs2_inode_info *f; | |
122 | struct jffs2_sb_info *c; | |
ec2e203c | 123 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
124 | struct jffs2_full_dirent *fd; |
125 | unsigned long offset, curofs; | |
126 | ||
ec2e203c | 127 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
128 | |
129 | f = JFFS2_INODE_INFO(inode); | |
130 | c = JFFS2_SB_INFO(inode->i_sb); | |
131 | ||
132 | offset = filp->f_pos; | |
133 | ||
134 | if (offset == 0) { | |
135 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
136 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
137 | goto out; | |
138 | offset++; | |
139 | } | |
140 | if (offset == 1) { | |
ec2e203c | 141 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
142 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
143 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
144 | goto out; | |
145 | offset++; | |
146 | } | |
147 | ||
148 | curofs=1; | |
ced22070 | 149 | mutex_lock(&f->sem); |
1da177e4 LT |
150 | for (fd = f->dents; fd; fd = fd->next) { |
151 | ||
152 | curofs++; | |
153 | /* First loop: curofs = 2; offset = 2 */ | |
154 | if (curofs < offset) { | |
182ec4ee | 155 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
156 | fd->name, fd->ino, fd->type, curofs, offset)); |
157 | continue; | |
158 | } | |
159 | if (!fd->ino) { | |
160 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
161 | offset++; | |
162 | continue; | |
163 | } | |
164 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
165 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
166 | break; | |
167 | offset++; | |
168 | } | |
ced22070 | 169 | mutex_unlock(&f->sem); |
1da177e4 LT |
170 | out: |
171 | filp->f_pos = offset; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /***********************************************************************/ | |
176 | ||
177 | ||
178 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
179 | struct nameidata *nd) | |
180 | { | |
181 | struct jffs2_raw_inode *ri; | |
182 | struct jffs2_inode_info *f, *dir_f; | |
183 | struct jffs2_sb_info *c; | |
184 | struct inode *inode; | |
185 | int ret; | |
186 | ||
187 | ri = jffs2_alloc_raw_inode(); | |
188 | if (!ri) | |
189 | return -ENOMEM; | |
182ec4ee | 190 | |
1da177e4 LT |
191 | c = JFFS2_SB_INFO(dir_i->i_sb); |
192 | ||
193 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
194 | ||
cfc8dc6f | 195 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
196 | |
197 | if (IS_ERR(inode)) { | |
198 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
199 | jffs2_free_raw_inode(ri); | |
200 | return PTR_ERR(inode); | |
201 | } | |
202 | ||
203 | inode->i_op = &jffs2_file_inode_operations; | |
204 | inode->i_fop = &jffs2_file_operations; | |
205 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
206 | inode->i_mapping->nrpages = 0; | |
207 | ||
208 | f = JFFS2_INODE_INFO(inode); | |
209 | dir_f = JFFS2_INODE_INFO(dir_i); | |
210 | ||
590fe34c DW |
211 | /* jffs2_do_create() will want to lock it, _after_ reserving |
212 | space and taking c-alloc_sem. If we keep it locked here, | |
213 | lockdep gets unhappy (although it's a false positive; | |
214 | nothing else will be looking at this inode yet so there's | |
215 | no chance of AB-BA deadlock involving its f->sem). */ | |
216 | mutex_unlock(&f->sem); | |
217 | ||
182ec4ee | 218 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 | 219 | dentry->d_name.name, dentry->d_name.len); |
aa98d7cf KK |
220 | if (ret) |
221 | goto fail; | |
1da177e4 LT |
222 | |
223 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
224 | ||
225 | jffs2_free_raw_inode(ri); | |
226 | d_instantiate(dentry, inode); | |
227 | ||
228 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
27c72b04 DW |
229 | inode->i_ino, inode->i_mode, inode->i_nlink, |
230 | f->inocache->pino_nlink, inode->i_mapping->nrpages)); | |
1da177e4 | 231 | return 0; |
aa98d7cf KK |
232 | |
233 | fail: | |
234 | make_bad_inode(inode); | |
235 | iput(inode); | |
236 | jffs2_free_raw_inode(ri); | |
237 | return ret; | |
1da177e4 LT |
238 | } |
239 | ||
240 | /***********************************************************************/ | |
241 | ||
242 | ||
243 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
244 | { | |
245 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
246 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
247 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
248 | int ret; | |
3a69e0cd | 249 | uint32_t now = get_seconds(); |
1da177e4 | 250 | |
182ec4ee | 251 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 252 | dentry->d_name.len, dead_f, now); |
1da177e4 | 253 | if (dead_f->inocache) |
27c72b04 | 254 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
3a69e0cd AB |
255 | if (!ret) |
256 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
257 | return ret; |
258 | } | |
259 | /***********************************************************************/ | |
260 | ||
261 | ||
262 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
263 | { | |
264 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
265 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
266 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
267 | int ret; | |
268 | uint8_t type; | |
3a69e0cd | 269 | uint32_t now; |
1da177e4 LT |
270 | |
271 | /* Don't let people make hard links to bad inodes. */ | |
272 | if (!f->inocache) | |
273 | return -EIO; | |
274 | ||
275 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
276 | return -EPERM; | |
277 | ||
278 | /* XXX: This is ugly */ | |
279 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
280 | if (!type) type = DT_REG; | |
281 | ||
3a69e0cd AB |
282 | now = get_seconds(); |
283 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
284 | |
285 | if (!ret) { | |
ced22070 | 286 | mutex_lock(&f->sem); |
27c72b04 | 287 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
ced22070 | 288 | mutex_unlock(&f->sem); |
1da177e4 | 289 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 290 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
291 | atomic_inc(&old_dentry->d_inode->i_count); |
292 | } | |
293 | return ret; | |
294 | } | |
295 | ||
296 | /***********************************************************************/ | |
297 | ||
298 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
299 | { | |
300 | struct jffs2_inode_info *f, *dir_f; | |
301 | struct jffs2_sb_info *c; | |
302 | struct inode *inode; | |
303 | struct jffs2_raw_inode *ri; | |
304 | struct jffs2_raw_dirent *rd; | |
305 | struct jffs2_full_dnode *fn; | |
306 | struct jffs2_full_dirent *fd; | |
307 | int namelen; | |
9fe4854c | 308 | uint32_t alloclen; |
32f1a95d | 309 | int ret, targetlen = strlen(target); |
1da177e4 LT |
310 | |
311 | /* FIXME: If you care. We'd need to use frags for the target | |
312 | if it grows much more than this */ | |
32f1a95d | 313 | if (targetlen > 254) |
1da177e4 LT |
314 | return -EINVAL; |
315 | ||
316 | ri = jffs2_alloc_raw_inode(); | |
317 | ||
318 | if (!ri) | |
319 | return -ENOMEM; | |
182ec4ee | 320 | |
1da177e4 | 321 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
322 | |
323 | /* Try to reserve enough space for both node and dirent. | |
324 | * Just the node will do for now, though | |
1da177e4 LT |
325 | */ |
326 | namelen = dentry->d_name.len; | |
9fe4854c DW |
327 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
328 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
329 | |
330 | if (ret) { | |
331 | jffs2_free_raw_inode(ri); | |
332 | return ret; | |
333 | } | |
334 | ||
cfc8dc6f | 335 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
336 | |
337 | if (IS_ERR(inode)) { | |
338 | jffs2_free_raw_inode(ri); | |
339 | jffs2_complete_reservation(c); | |
340 | return PTR_ERR(inode); | |
341 | } | |
342 | ||
343 | inode->i_op = &jffs2_symlink_inode_operations; | |
344 | ||
345 | f = JFFS2_INODE_INFO(inode); | |
346 | ||
32f1a95d | 347 | inode->i_size = targetlen; |
1da177e4 LT |
348 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
349 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
350 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
351 | ||
352 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 353 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 354 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 355 | |
9fe4854c | 356 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
357 | |
358 | jffs2_free_raw_inode(ri); | |
359 | ||
360 | if (IS_ERR(fn)) { | |
361 | /* Eeek. Wave bye bye */ | |
ced22070 | 362 | mutex_unlock(&f->sem); |
1da177e4 LT |
363 | jffs2_complete_reservation(c); |
364 | jffs2_clear_inode(inode); | |
365 | return PTR_ERR(fn); | |
366 | } | |
32f1a95d | 367 | |
2b79adcc AB |
368 | /* We use f->target field to store the target path. */ |
369 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); | |
370 | if (!f->target) { | |
32f1a95d | 371 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 372 | mutex_unlock(&f->sem); |
32f1a95d AB |
373 | jffs2_complete_reservation(c); |
374 | jffs2_clear_inode(inode); | |
375 | return -ENOMEM; | |
376 | } | |
377 | ||
2b79adcc AB |
378 | memcpy(f->target, target, targetlen + 1); |
379 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); | |
32f1a95d | 380 | |
182ec4ee | 381 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
382 | obsoleted by the first data write |
383 | */ | |
384 | f->metadata = fn; | |
ced22070 | 385 | mutex_unlock(&f->sem); |
1da177e4 LT |
386 | |
387 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
388 | |
389 | ret = jffs2_init_security(inode, dir_i); | |
390 | if (ret) { | |
391 | jffs2_clear_inode(inode); | |
392 | return ret; | |
393 | } | |
cfc8dc6f | 394 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
395 | if (ret) { |
396 | jffs2_clear_inode(inode); | |
397 | return ret; | |
398 | } | |
399 | ||
9fe4854c DW |
400 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
401 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
402 | if (ret) { |
403 | /* Eep. */ | |
404 | jffs2_clear_inode(inode); | |
405 | return ret; | |
406 | } | |
407 | ||
408 | rd = jffs2_alloc_raw_dirent(); | |
409 | if (!rd) { | |
410 | /* Argh. Now we treat it like a normal delete */ | |
411 | jffs2_complete_reservation(c); | |
412 | jffs2_clear_inode(inode); | |
413 | return -ENOMEM; | |
414 | } | |
415 | ||
416 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 417 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
418 | |
419 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
420 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
421 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
422 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
423 | ||
424 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
425 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
426 | rd->ino = cpu_to_je32(inode->i_ino); | |
427 | rd->mctime = cpu_to_je32(get_seconds()); | |
428 | rd->nsize = namelen; | |
429 | rd->type = DT_LNK; | |
430 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
431 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
432 | ||
9fe4854c | 433 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
434 | |
435 | if (IS_ERR(fd)) { | |
182ec4ee | 436 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
437 | as if it were the final unlink() */ |
438 | jffs2_complete_reservation(c); | |
439 | jffs2_free_raw_dirent(rd); | |
ced22070 | 440 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
441 | jffs2_clear_inode(inode); |
442 | return PTR_ERR(fd); | |
443 | } | |
444 | ||
445 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
446 | ||
447 | jffs2_free_raw_dirent(rd); | |
448 | ||
449 | /* Link the fd into the inode's list, obsoleting an old | |
450 | one if necessary. */ | |
451 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
452 | ||
ced22070 | 453 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
454 | jffs2_complete_reservation(c); |
455 | ||
456 | d_instantiate(dentry, inode); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | ||
461 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
462 | { | |
463 | struct jffs2_inode_info *f, *dir_f; | |
464 | struct jffs2_sb_info *c; | |
465 | struct inode *inode; | |
466 | struct jffs2_raw_inode *ri; | |
467 | struct jffs2_raw_dirent *rd; | |
468 | struct jffs2_full_dnode *fn; | |
469 | struct jffs2_full_dirent *fd; | |
470 | int namelen; | |
9fe4854c | 471 | uint32_t alloclen; |
1da177e4 LT |
472 | int ret; |
473 | ||
474 | mode |= S_IFDIR; | |
475 | ||
476 | ri = jffs2_alloc_raw_inode(); | |
477 | if (!ri) | |
478 | return -ENOMEM; | |
182ec4ee | 479 | |
1da177e4 LT |
480 | c = JFFS2_SB_INFO(dir_i->i_sb); |
481 | ||
182ec4ee TG |
482 | /* Try to reserve enough space for both node and dirent. |
483 | * Just the node will do for now, though | |
1da177e4 LT |
484 | */ |
485 | namelen = dentry->d_name.len; | |
9fe4854c DW |
486 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
487 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
488 | |
489 | if (ret) { | |
490 | jffs2_free_raw_inode(ri); | |
491 | return ret; | |
492 | } | |
493 | ||
cfc8dc6f | 494 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
495 | |
496 | if (IS_ERR(inode)) { | |
497 | jffs2_free_raw_inode(ri); | |
498 | jffs2_complete_reservation(c); | |
499 | return PTR_ERR(inode); | |
500 | } | |
501 | ||
502 | inode->i_op = &jffs2_dir_inode_operations; | |
503 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
504 | |
505 | f = JFFS2_INODE_INFO(inode); | |
506 | ||
27c72b04 DW |
507 | /* Directories get nlink 2 at start */ |
508 | inode->i_nlink = 2; | |
509 | /* but ic->pino_nlink is the parent ino# */ | |
510 | f->inocache->pino_nlink = dir_i->i_ino; | |
511 | ||
1da177e4 LT |
512 | ri->data_crc = cpu_to_je32(0); |
513 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 514 | |
9fe4854c | 515 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
516 | |
517 | jffs2_free_raw_inode(ri); | |
518 | ||
519 | if (IS_ERR(fn)) { | |
520 | /* Eeek. Wave bye bye */ | |
ced22070 | 521 | mutex_unlock(&f->sem); |
1da177e4 LT |
522 | jffs2_complete_reservation(c); |
523 | jffs2_clear_inode(inode); | |
524 | return PTR_ERR(fn); | |
525 | } | |
182ec4ee | 526 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
527 | obsoleted by the first data write |
528 | */ | |
529 | f->metadata = fn; | |
ced22070 | 530 | mutex_unlock(&f->sem); |
1da177e4 LT |
531 | |
532 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
533 | |
534 | ret = jffs2_init_security(inode, dir_i); | |
535 | if (ret) { | |
536 | jffs2_clear_inode(inode); | |
537 | return ret; | |
538 | } | |
cfc8dc6f | 539 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
540 | if (ret) { |
541 | jffs2_clear_inode(inode); | |
542 | return ret; | |
543 | } | |
544 | ||
9fe4854c DW |
545 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
546 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
547 | if (ret) { |
548 | /* Eep. */ | |
549 | jffs2_clear_inode(inode); | |
550 | return ret; | |
551 | } | |
182ec4ee | 552 | |
1da177e4 LT |
553 | rd = jffs2_alloc_raw_dirent(); |
554 | if (!rd) { | |
555 | /* Argh. Now we treat it like a normal delete */ | |
556 | jffs2_complete_reservation(c); | |
557 | jffs2_clear_inode(inode); | |
558 | return -ENOMEM; | |
559 | } | |
560 | ||
561 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 562 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
563 | |
564 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
565 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
566 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
567 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
568 | ||
569 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
570 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
571 | rd->ino = cpu_to_je32(inode->i_ino); | |
572 | rd->mctime = cpu_to_je32(get_seconds()); | |
573 | rd->nsize = namelen; | |
574 | rd->type = DT_DIR; | |
575 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
576 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
577 | ||
9fe4854c | 578 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 579 | |
1da177e4 | 580 | if (IS_ERR(fd)) { |
182ec4ee | 581 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
582 | as if it were the final unlink() */ |
583 | jffs2_complete_reservation(c); | |
584 | jffs2_free_raw_dirent(rd); | |
ced22070 | 585 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
586 | jffs2_clear_inode(inode); |
587 | return PTR_ERR(fd); | |
588 | } | |
589 | ||
590 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 591 | inc_nlink(dir_i); |
1da177e4 LT |
592 | |
593 | jffs2_free_raw_dirent(rd); | |
594 | ||
595 | /* Link the fd into the inode's list, obsoleting an old | |
596 | one if necessary. */ | |
597 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
598 | ||
ced22070 | 599 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
600 | jffs2_complete_reservation(c); |
601 | ||
602 | d_instantiate(dentry, inode); | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
607 | { | |
27c72b04 DW |
608 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
609 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
610 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
611 | struct jffs2_full_dirent *fd; | |
612 | int ret; | |
27c72b04 | 613 | uint32_t now = get_seconds(); |
1da177e4 LT |
614 | |
615 | for (fd = f->dents ; fd; fd = fd->next) { | |
616 | if (fd->ino) | |
617 | return -ENOTEMPTY; | |
618 | } | |
27c72b04 DW |
619 | |
620 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
621 | dentry->d_name.len, f, now); | |
622 | if (!ret) { | |
623 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
624 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 625 | drop_nlink(dir_i); |
27c72b04 | 626 | } |
1da177e4 LT |
627 | return ret; |
628 | } | |
629 | ||
265489f0 | 630 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
631 | { |
632 | struct jffs2_inode_info *f, *dir_f; | |
633 | struct jffs2_sb_info *c; | |
634 | struct inode *inode; | |
635 | struct jffs2_raw_inode *ri; | |
636 | struct jffs2_raw_dirent *rd; | |
637 | struct jffs2_full_dnode *fn; | |
638 | struct jffs2_full_dirent *fd; | |
639 | int namelen; | |
aef9ab47 | 640 | union jffs2_device_node dev; |
1da177e4 | 641 | int devlen = 0; |
9fe4854c | 642 | uint32_t alloclen; |
1da177e4 LT |
643 | int ret; |
644 | ||
aef9ab47 | 645 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
646 | return -EINVAL; |
647 | ||
648 | ri = jffs2_alloc_raw_inode(); | |
649 | if (!ri) | |
650 | return -ENOMEM; | |
182ec4ee | 651 | |
1da177e4 | 652 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 653 | |
aef9ab47 DW |
654 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
655 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
656 | |
657 | /* Try to reserve enough space for both node and dirent. | |
658 | * Just the node will do for now, though | |
1da177e4 LT |
659 | */ |
660 | namelen = dentry->d_name.len; | |
9fe4854c | 661 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 662 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
663 | |
664 | if (ret) { | |
665 | jffs2_free_raw_inode(ri); | |
666 | return ret; | |
667 | } | |
668 | ||
cfc8dc6f | 669 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
670 | |
671 | if (IS_ERR(inode)) { | |
672 | jffs2_free_raw_inode(ri); | |
673 | jffs2_complete_reservation(c); | |
674 | return PTR_ERR(inode); | |
675 | } | |
676 | inode->i_op = &jffs2_file_inode_operations; | |
677 | init_special_inode(inode, inode->i_mode, rdev); | |
678 | ||
679 | f = JFFS2_INODE_INFO(inode); | |
680 | ||
681 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
682 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
683 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
684 | ||
685 | ri->compr = JFFS2_COMPR_NONE; | |
686 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
687 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 688 | |
9fe4854c | 689 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
690 | |
691 | jffs2_free_raw_inode(ri); | |
692 | ||
693 | if (IS_ERR(fn)) { | |
694 | /* Eeek. Wave bye bye */ | |
ced22070 | 695 | mutex_unlock(&f->sem); |
1da177e4 LT |
696 | jffs2_complete_reservation(c); |
697 | jffs2_clear_inode(inode); | |
698 | return PTR_ERR(fn); | |
699 | } | |
182ec4ee | 700 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
701 | obsoleted by the first data write |
702 | */ | |
703 | f->metadata = fn; | |
ced22070 | 704 | mutex_unlock(&f->sem); |
1da177e4 LT |
705 | |
706 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
707 | |
708 | ret = jffs2_init_security(inode, dir_i); | |
709 | if (ret) { | |
710 | jffs2_clear_inode(inode); | |
711 | return ret; | |
712 | } | |
cfc8dc6f | 713 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
714 | if (ret) { |
715 | jffs2_clear_inode(inode); | |
716 | return ret; | |
717 | } | |
718 | ||
9fe4854c DW |
719 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
720 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
721 | if (ret) { |
722 | /* Eep. */ | |
723 | jffs2_clear_inode(inode); | |
724 | return ret; | |
725 | } | |
726 | ||
727 | rd = jffs2_alloc_raw_dirent(); | |
728 | if (!rd) { | |
729 | /* Argh. Now we treat it like a normal delete */ | |
730 | jffs2_complete_reservation(c); | |
731 | jffs2_clear_inode(inode); | |
732 | return -ENOMEM; | |
733 | } | |
734 | ||
735 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 736 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
737 | |
738 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
739 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
740 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
741 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
742 | ||
743 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
744 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
745 | rd->ino = cpu_to_je32(inode->i_ino); | |
746 | rd->mctime = cpu_to_je32(get_seconds()); | |
747 | rd->nsize = namelen; | |
748 | ||
749 | /* XXX: This is ugly. */ | |
750 | rd->type = (mode & S_IFMT) >> 12; | |
751 | ||
752 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
753 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
754 | ||
9fe4854c | 755 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 756 | |
1da177e4 | 757 | if (IS_ERR(fd)) { |
182ec4ee | 758 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
759 | as if it were the final unlink() */ |
760 | jffs2_complete_reservation(c); | |
761 | jffs2_free_raw_dirent(rd); | |
ced22070 | 762 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
763 | jffs2_clear_inode(inode); |
764 | return PTR_ERR(fd); | |
765 | } | |
766 | ||
767 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
768 | ||
769 | jffs2_free_raw_dirent(rd); | |
770 | ||
771 | /* Link the fd into the inode's list, obsoleting an old | |
772 | one if necessary. */ | |
773 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
774 | ||
ced22070 | 775 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
776 | jffs2_complete_reservation(c); |
777 | ||
778 | d_instantiate(dentry, inode); | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
783 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 784 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
785 | { |
786 | int ret; | |
787 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
788 | struct jffs2_inode_info *victim_f = NULL; | |
789 | uint8_t type; | |
3a69e0cd | 790 | uint32_t now; |
1da177e4 | 791 | |
182ec4ee | 792 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
793 | * file over a directory and vice versa, but if it's a directory, |
794 | * the VFS can't check whether the victim is empty. The filesystem | |
795 | * needs to do that for itself. | |
796 | */ | |
797 | if (new_dentry->d_inode) { | |
798 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
799 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
800 | struct jffs2_full_dirent *fd; | |
801 | ||
ced22070 | 802 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
803 | for (fd = victim_f->dents; fd; fd = fd->next) { |
804 | if (fd->ino) { | |
ced22070 | 805 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
806 | return -ENOTEMPTY; |
807 | } | |
808 | } | |
ced22070 | 809 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
810 | } |
811 | } | |
812 | ||
813 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 814 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
815 | then getting -ENOSPC, is quite bad :) |
816 | */ | |
817 | ||
818 | /* Make a hard link */ | |
182ec4ee | 819 | |
1da177e4 LT |
820 | /* XXX: This is ugly */ |
821 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
822 | if (!type) type = DT_REG; | |
823 | ||
3a69e0cd | 824 | now = get_seconds(); |
182ec4ee | 825 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 826 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 827 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
828 | |
829 | if (ret) | |
830 | return ret; | |
831 | ||
832 | if (victim_f) { | |
833 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 834 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
835 | /* Don't oops if the victim was a dirent pointing to an |
836 | inode which didn't exist. */ | |
837 | if (victim_f->inocache) { | |
ced22070 | 838 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
839 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
840 | victim_f->inocache->pino_nlink = 0; | |
841 | else | |
842 | victim_f->inocache->pino_nlink--; | |
ced22070 | 843 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
844 | } |
845 | } | |
846 | ||
182ec4ee | 847 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
848 | increase i_nlink on its new parent */ |
849 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 850 | inc_nlink(new_dir_i); |
1da177e4 LT |
851 | |
852 | /* Unlink the original */ | |
182ec4ee | 853 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 854 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
855 | |
856 | /* We don't touch inode->i_nlink */ | |
857 | ||
858 | if (ret) { | |
859 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
860 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 861 | mutex_lock(&f->sem); |
d8c76e6f | 862 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
863 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
864 | f->inocache->pino_nlink++; | |
ced22070 | 865 | mutex_unlock(&f->sem); |
1da177e4 LT |
866 | |
867 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
868 | /* Might as well let the VFS know */ | |
869 | d_instantiate(new_dentry, old_dentry->d_inode); | |
870 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 871 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
872 | return ret; |
873 | } | |
874 | ||
875 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 876 | drop_nlink(old_dir_i); |
1da177e4 | 877 | |
3a69e0cd AB |
878 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
879 | ||
1da177e4 LT |
880 | return 0; |
881 | } | |
882 |