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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
6088c058 | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * For licensing information, see the file 'LICENCE' in this directory. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
5a528957 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/slab.h> | |
1da177e4 LT |
17 | #include <linux/fs.h> |
18 | #include <linux/crc32.h> | |
19 | #include <linux/jffs2.h> | |
cbb9a561 DW |
20 | #include "jffs2_fs_i.h" |
21 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
22 | #include <linux/time.h> |
23 | #include "nodelist.h" | |
24 | ||
0312fa7c | 25 | static int jffs2_readdir (struct file *, struct dir_context *); |
1da177e4 | 26 | |
4acdaf27 | 27 | static int jffs2_create (struct inode *,struct dentry *,umode_t, |
ebfc3b49 | 28 | bool); |
1da177e4 | 29 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, |
00cd8dd3 | 30 | unsigned int); |
1da177e4 LT |
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 *); | |
18bb1db3 | 34 | static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); |
1da177e4 | 35 | static int jffs2_rmdir (struct inode *,struct dentry *); |
1a67aafb | 36 | static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 37 | static int jffs2_rename (struct inode *, struct dentry *, |
ef53cb02 | 38 | struct inode *, struct dentry *); |
1da177e4 | 39 | |
4b6f5d20 | 40 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
41 | { |
42 | .read = generic_read_dir, | |
0312fa7c | 43 | .iterate = jffs2_readdir, |
0533400b | 44 | .unlocked_ioctl=jffs2_ioctl, |
3222a3e5 CH |
45 | .fsync = jffs2_fsync, |
46 | .llseek = generic_file_llseek, | |
1da177e4 LT |
47 | }; |
48 | ||
49 | ||
92e1d5be | 50 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 51 | { |
265489f0 DW |
52 | .create = jffs2_create, |
53 | .lookup = jffs2_lookup, | |
1da177e4 LT |
54 | .link = jffs2_link, |
55 | .unlink = jffs2_unlink, | |
56 | .symlink = jffs2_symlink, | |
57 | .mkdir = jffs2_mkdir, | |
58 | .rmdir = jffs2_rmdir, | |
59 | .mknod = jffs2_mknod, | |
60 | .rename = jffs2_rename, | |
4e34e719 | 61 | .get_acl = jffs2_get_acl, |
f2963d45 | 62 | .set_acl = jffs2_set_acl, |
1da177e4 | 63 | .setattr = jffs2_setattr, |
aa98d7cf KK |
64 | .setxattr = jffs2_setxattr, |
65 | .getxattr = jffs2_getxattr, | |
66 | .listxattr = jffs2_listxattr, | |
67 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
68 | }; |
69 | ||
70 | /***********************************************************************/ | |
71 | ||
72 | ||
73 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 74 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
75 | nice and simple |
76 | */ | |
77 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
00cd8dd3 | 78 | unsigned int flags) |
1da177e4 LT |
79 | { |
80 | struct jffs2_inode_info *dir_f; | |
1da177e4 LT |
81 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
82 | uint32_t ino = 0; | |
83 | struct inode *inode = NULL; | |
84 | ||
9c261b33 | 85 | jffs2_dbg(1, "jffs2_lookup()\n"); |
1da177e4 | 86 | |
373d5e71 RP |
87 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
88 | return ERR_PTR(-ENAMETOOLONG); | |
89 | ||
1da177e4 | 90 | dir_f = JFFS2_INODE_INFO(dir_i); |
1da177e4 | 91 | |
ced22070 | 92 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
93 | |
94 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
95 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 96 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
97 | (!fd || fd_list->version > fd->version) && |
98 | strlen(fd_list->name) == target->d_name.len && | |
99 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
100 | fd = fd_list; | |
101 | } | |
102 | } | |
103 | if (fd) | |
104 | ino = fd->ino; | |
ced22070 | 105 | mutex_unlock(&dir_f->sem); |
1da177e4 | 106 | if (ino) { |
5451f79f | 107 | inode = jffs2_iget(dir_i->i_sb, ino); |
a9049376 | 108 | if (IS_ERR(inode)) |
da320f05 | 109 | pr_warn("iget() failed for ino #%u\n", ino); |
1da177e4 LT |
110 | } |
111 | ||
8966c5e0 | 112 | return d_splice_alias(inode, target); |
1da177e4 LT |
113 | } |
114 | ||
115 | /***********************************************************************/ | |
116 | ||
117 | ||
0312fa7c | 118 | static int jffs2_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 119 | { |
0312fa7c AV |
120 | struct inode *inode = file_inode(file); |
121 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1da177e4 | 122 | struct jffs2_full_dirent *fd; |
0312fa7c | 123 | unsigned long curofs = 1; |
1da177e4 | 124 | |
0312fa7c | 125 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); |
1da177e4 | 126 | |
0312fa7c AV |
127 | if (!dir_emit_dots(file, ctx)) |
128 | return 0; | |
1da177e4 | 129 | |
ced22070 | 130 | mutex_lock(&f->sem); |
1da177e4 | 131 | for (fd = f->dents; fd; fd = fd->next) { |
1da177e4 | 132 | curofs++; |
0312fa7c AV |
133 | /* First loop: curofs = 2; pos = 2 */ |
134 | if (curofs < ctx->pos) { | |
9c261b33 | 135 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
0312fa7c | 136 | fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
1da177e4 LT |
137 | continue; |
138 | } | |
139 | if (!fd->ino) { | |
9c261b33 JP |
140 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
141 | fd->name); | |
0312fa7c | 142 | ctx->pos++; |
1da177e4 LT |
143 | continue; |
144 | } | |
9c261b33 | 145 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
0312fa7c AV |
146 | (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); |
147 | if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) | |
1da177e4 | 148 | break; |
0312fa7c | 149 | ctx->pos++; |
1da177e4 | 150 | } |
ced22070 | 151 | mutex_unlock(&f->sem); |
1da177e4 LT |
152 | return 0; |
153 | } | |
154 | ||
155 | /***********************************************************************/ | |
156 | ||
157 | ||
4acdaf27 | 158 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
ebfc3b49 | 159 | umode_t mode, bool excl) |
1da177e4 LT |
160 | { |
161 | struct jffs2_raw_inode *ri; | |
162 | struct jffs2_inode_info *f, *dir_f; | |
163 | struct jffs2_sb_info *c; | |
164 | struct inode *inode; | |
165 | int ret; | |
166 | ||
167 | ri = jffs2_alloc_raw_inode(); | |
168 | if (!ri) | |
169 | return -ENOMEM; | |
182ec4ee | 170 | |
1da177e4 LT |
171 | c = JFFS2_SB_INFO(dir_i->i_sb); |
172 | ||
9c261b33 | 173 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 174 | |
cfc8dc6f | 175 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
176 | |
177 | if (IS_ERR(inode)) { | |
9c261b33 | 178 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
179 | jffs2_free_raw_inode(ri); |
180 | return PTR_ERR(inode); | |
181 | } | |
182 | ||
183 | inode->i_op = &jffs2_file_inode_operations; | |
184 | inode->i_fop = &jffs2_file_operations; | |
185 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
186 | inode->i_mapping->nrpages = 0; | |
187 | ||
188 | f = JFFS2_INODE_INFO(inode); | |
189 | dir_f = JFFS2_INODE_INFO(dir_i); | |
190 | ||
590fe34c DW |
191 | /* jffs2_do_create() will want to lock it, _after_ reserving |
192 | space and taking c-alloc_sem. If we keep it locked here, | |
193 | lockdep gets unhappy (although it's a false positive; | |
194 | nothing else will be looking at this inode yet so there's | |
195 | no chance of AB-BA deadlock involving its f->sem). */ | |
196 | mutex_unlock(&f->sem); | |
197 | ||
2a7dba39 | 198 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
199 | if (ret) |
200 | goto fail; | |
1da177e4 LT |
201 | |
202 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
203 | ||
204 | jffs2_free_raw_inode(ri); | |
1da177e4 | 205 | |
9c261b33 JP |
206 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
207 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
208 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 | 209 | |
e72e6497 | 210 | unlock_new_inode(inode); |
8fc37ec5 | 211 | d_instantiate(dentry, inode); |
1da177e4 | 212 | return 0; |
aa98d7cf KK |
213 | |
214 | fail: | |
41cce647 | 215 | iget_failed(inode); |
aa98d7cf KK |
216 | jffs2_free_raw_inode(ri); |
217 | return ret; | |
1da177e4 LT |
218 | } |
219 | ||
220 | /***********************************************************************/ | |
221 | ||
222 | ||
223 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
224 | { | |
225 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
226 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
227 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
228 | int ret; | |
3a69e0cd | 229 | uint32_t now = get_seconds(); |
1da177e4 | 230 | |
182ec4ee | 231 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 232 | dentry->d_name.len, dead_f, now); |
1da177e4 | 233 | if (dead_f->inocache) |
bfe86848 | 234 | set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); |
3a69e0cd AB |
235 | if (!ret) |
236 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
237 | return ret; |
238 | } | |
239 | /***********************************************************************/ | |
240 | ||
241 | ||
242 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
243 | { | |
244 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
245 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
246 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
247 | int ret; | |
248 | uint8_t type; | |
3a69e0cd | 249 | uint32_t now; |
1da177e4 LT |
250 | |
251 | /* Don't let people make hard links to bad inodes. */ | |
252 | if (!f->inocache) | |
253 | return -EIO; | |
254 | ||
255 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
256 | return -EPERM; | |
257 | ||
258 | /* XXX: This is ugly */ | |
259 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
260 | if (!type) type = DT_REG; | |
261 | ||
3a69e0cd AB |
262 | now = get_seconds(); |
263 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
264 | |
265 | if (!ret) { | |
ced22070 | 266 | mutex_lock(&f->sem); |
bfe86848 | 267 | set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); |
ced22070 | 268 | mutex_unlock(&f->sem); |
1da177e4 | 269 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 270 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 271 | ihold(old_dentry->d_inode); |
1da177e4 LT |
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; | |
9fe4854c | 288 | uint32_t alloclen; |
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) |
bde86fec | 294 | return -ENAMETOOLONG; |
1da177e4 LT |
295 | |
296 | ri = jffs2_alloc_raw_inode(); | |
297 | ||
298 | if (!ri) | |
299 | return -ENOMEM; | |
182ec4ee | 300 | |
1da177e4 | 301 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
302 | |
303 | /* Try to reserve enough space for both node and dirent. | |
304 | * Just the node will do for now, though | |
1da177e4 LT |
305 | */ |
306 | namelen = dentry->d_name.len; | |
9fe4854c DW |
307 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
308 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
309 | |
310 | if (ret) { | |
311 | jffs2_free_raw_inode(ri); | |
312 | return ret; | |
313 | } | |
314 | ||
cfc8dc6f | 315 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
316 | |
317 | if (IS_ERR(inode)) { | |
318 | jffs2_free_raw_inode(ri); | |
319 | jffs2_complete_reservation(c); | |
320 | return PTR_ERR(inode); | |
321 | } | |
322 | ||
323 | inode->i_op = &jffs2_symlink_inode_operations; | |
324 | ||
325 | f = JFFS2_INODE_INFO(inode); | |
326 | ||
32f1a95d | 327 | inode->i_size = targetlen; |
1da177e4 LT |
328 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
329 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
330 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
331 | ||
332 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 333 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 334 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 335 | |
9fe4854c | 336 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
337 | |
338 | jffs2_free_raw_inode(ri); | |
339 | ||
340 | if (IS_ERR(fn)) { | |
341 | /* Eeek. Wave bye bye */ | |
ced22070 | 342 | mutex_unlock(&f->sem); |
1da177e4 | 343 | jffs2_complete_reservation(c); |
f324e4cb DW |
344 | ret = PTR_ERR(fn); |
345 | goto fail; | |
1da177e4 | 346 | } |
32f1a95d | 347 | |
2b79adcc | 348 | /* We use f->target field to store the target path. */ |
04aadf36 | 349 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 350 | if (!f->target) { |
da320f05 | 351 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 352 | mutex_unlock(&f->sem); |
32f1a95d | 353 | jffs2_complete_reservation(c); |
f324e4cb DW |
354 | ret = -ENOMEM; |
355 | goto fail; | |
32f1a95d AB |
356 | } |
357 | ||
9c261b33 JP |
358 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
359 | __func__, (char *)f->target); | |
32f1a95d | 360 | |
182ec4ee | 361 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
362 | obsoleted by the first data write |
363 | */ | |
364 | f->metadata = fn; | |
ced22070 | 365 | mutex_unlock(&f->sem); |
1da177e4 LT |
366 | |
367 | jffs2_complete_reservation(c); | |
aa98d7cf | 368 | |
2a7dba39 | 369 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
370 | if (ret) |
371 | goto fail; | |
372 | ||
cfc8dc6f | 373 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
374 | if (ret) |
375 | goto fail; | |
aa98d7cf | 376 | |
9fe4854c DW |
377 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
378 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
379 | if (ret) |
380 | goto fail; | |
1da177e4 LT |
381 | |
382 | rd = jffs2_alloc_raw_dirent(); | |
383 | if (!rd) { | |
384 | /* Argh. Now we treat it like a normal delete */ | |
385 | jffs2_complete_reservation(c); | |
f324e4cb DW |
386 | ret = -ENOMEM; |
387 | goto fail; | |
1da177e4 LT |
388 | } |
389 | ||
390 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 391 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
392 | |
393 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
394 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
395 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
396 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
397 | ||
398 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
399 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
400 | rd->ino = cpu_to_je32(inode->i_ino); | |
401 | rd->mctime = cpu_to_je32(get_seconds()); | |
402 | rd->nsize = namelen; | |
403 | rd->type = DT_LNK; | |
404 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
405 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
406 | ||
9fe4854c | 407 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
408 | |
409 | if (IS_ERR(fd)) { | |
182ec4ee | 410 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
411 | as if it were the final unlink() */ |
412 | jffs2_complete_reservation(c); | |
413 | jffs2_free_raw_dirent(rd); | |
ced22070 | 414 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
415 | ret = PTR_ERR(fd); |
416 | goto fail; | |
1da177e4 LT |
417 | } |
418 | ||
419 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
420 | ||
421 | jffs2_free_raw_dirent(rd); | |
422 | ||
423 | /* Link the fd into the inode's list, obsoleting an old | |
424 | one if necessary. */ | |
425 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
426 | ||
ced22070 | 427 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
428 | jffs2_complete_reservation(c); |
429 | ||
e72e6497 | 430 | unlock_new_inode(inode); |
8fc37ec5 | 431 | d_instantiate(dentry, inode); |
1da177e4 | 432 | return 0; |
f324e4cb DW |
433 | |
434 | fail: | |
41cce647 | 435 | iget_failed(inode); |
f324e4cb | 436 | return ret; |
1da177e4 LT |
437 | } |
438 | ||
439 | ||
18bb1db3 | 440 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
441 | { |
442 | struct jffs2_inode_info *f, *dir_f; | |
443 | struct jffs2_sb_info *c; | |
444 | struct inode *inode; | |
445 | struct jffs2_raw_inode *ri; | |
446 | struct jffs2_raw_dirent *rd; | |
447 | struct jffs2_full_dnode *fn; | |
448 | struct jffs2_full_dirent *fd; | |
449 | int namelen; | |
9fe4854c | 450 | uint32_t alloclen; |
1da177e4 LT |
451 | int ret; |
452 | ||
453 | mode |= S_IFDIR; | |
454 | ||
455 | ri = jffs2_alloc_raw_inode(); | |
456 | if (!ri) | |
457 | return -ENOMEM; | |
182ec4ee | 458 | |
1da177e4 LT |
459 | c = JFFS2_SB_INFO(dir_i->i_sb); |
460 | ||
182ec4ee TG |
461 | /* Try to reserve enough space for both node and dirent. |
462 | * Just the node will do for now, though | |
1da177e4 LT |
463 | */ |
464 | namelen = dentry->d_name.len; | |
9fe4854c DW |
465 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
466 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
467 | |
468 | if (ret) { | |
469 | jffs2_free_raw_inode(ri); | |
470 | return ret; | |
471 | } | |
472 | ||
cfc8dc6f | 473 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
474 | |
475 | if (IS_ERR(inode)) { | |
476 | jffs2_free_raw_inode(ri); | |
477 | jffs2_complete_reservation(c); | |
478 | return PTR_ERR(inode); | |
479 | } | |
480 | ||
481 | inode->i_op = &jffs2_dir_inode_operations; | |
482 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
483 | |
484 | f = JFFS2_INODE_INFO(inode); | |
485 | ||
27c72b04 | 486 | /* Directories get nlink 2 at start */ |
bfe86848 | 487 | set_nlink(inode, 2); |
27c72b04 DW |
488 | /* but ic->pino_nlink is the parent ino# */ |
489 | f->inocache->pino_nlink = dir_i->i_ino; | |
490 | ||
1da177e4 LT |
491 | ri->data_crc = cpu_to_je32(0); |
492 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 493 | |
9fe4854c | 494 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
495 | |
496 | jffs2_free_raw_inode(ri); | |
497 | ||
498 | if (IS_ERR(fn)) { | |
499 | /* Eeek. Wave bye bye */ | |
ced22070 | 500 | mutex_unlock(&f->sem); |
1da177e4 | 501 | jffs2_complete_reservation(c); |
f324e4cb DW |
502 | ret = PTR_ERR(fn); |
503 | goto fail; | |
1da177e4 | 504 | } |
182ec4ee | 505 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
506 | obsoleted by the first data write |
507 | */ | |
508 | f->metadata = fn; | |
ced22070 | 509 | mutex_unlock(&f->sem); |
1da177e4 LT |
510 | |
511 | jffs2_complete_reservation(c); | |
aa98d7cf | 512 | |
2a7dba39 | 513 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
514 | if (ret) |
515 | goto fail; | |
516 | ||
cfc8dc6f | 517 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
518 | if (ret) |
519 | goto fail; | |
aa98d7cf | 520 | |
9fe4854c DW |
521 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
522 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
523 | if (ret) |
524 | goto fail; | |
182ec4ee | 525 | |
1da177e4 LT |
526 | rd = jffs2_alloc_raw_dirent(); |
527 | if (!rd) { | |
528 | /* Argh. Now we treat it like a normal delete */ | |
529 | jffs2_complete_reservation(c); | |
f324e4cb DW |
530 | ret = -ENOMEM; |
531 | goto fail; | |
1da177e4 LT |
532 | } |
533 | ||
534 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 535 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
536 | |
537 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
538 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
539 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
540 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
541 | ||
542 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
543 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
544 | rd->ino = cpu_to_je32(inode->i_ino); | |
545 | rd->mctime = cpu_to_je32(get_seconds()); | |
546 | rd->nsize = namelen; | |
547 | rd->type = DT_DIR; | |
548 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
549 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
550 | ||
9fe4854c | 551 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 552 | |
1da177e4 | 553 | if (IS_ERR(fd)) { |
182ec4ee | 554 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
555 | as if it were the final unlink() */ |
556 | jffs2_complete_reservation(c); | |
557 | jffs2_free_raw_dirent(rd); | |
ced22070 | 558 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
559 | ret = PTR_ERR(fd); |
560 | goto fail; | |
1da177e4 LT |
561 | } |
562 | ||
563 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 564 | inc_nlink(dir_i); |
1da177e4 LT |
565 | |
566 | jffs2_free_raw_dirent(rd); | |
567 | ||
568 | /* Link the fd into the inode's list, obsoleting an old | |
569 | one if necessary. */ | |
570 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
571 | ||
ced22070 | 572 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
573 | jffs2_complete_reservation(c); |
574 | ||
e72e6497 | 575 | unlock_new_inode(inode); |
8fc37ec5 | 576 | d_instantiate(dentry, inode); |
1da177e4 | 577 | return 0; |
f324e4cb DW |
578 | |
579 | fail: | |
41cce647 | 580 | iget_failed(inode); |
f324e4cb | 581 | return ret; |
1da177e4 LT |
582 | } |
583 | ||
584 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
585 | { | |
27c72b04 DW |
586 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
587 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
588 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
589 | struct jffs2_full_dirent *fd; | |
590 | int ret; | |
27c72b04 | 591 | uint32_t now = get_seconds(); |
1da177e4 LT |
592 | |
593 | for (fd = f->dents ; fd; fd = fd->next) { | |
594 | if (fd->ino) | |
595 | return -ENOTEMPTY; | |
596 | } | |
27c72b04 DW |
597 | |
598 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
599 | dentry->d_name.len, f, now); | |
600 | if (!ret) { | |
601 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
602 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 603 | drop_nlink(dir_i); |
27c72b04 | 604 | } |
1da177e4 LT |
605 | return ret; |
606 | } | |
607 | ||
1a67aafb | 608 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
609 | { |
610 | struct jffs2_inode_info *f, *dir_f; | |
611 | struct jffs2_sb_info *c; | |
612 | struct inode *inode; | |
613 | struct jffs2_raw_inode *ri; | |
614 | struct jffs2_raw_dirent *rd; | |
615 | struct jffs2_full_dnode *fn; | |
616 | struct jffs2_full_dirent *fd; | |
617 | int namelen; | |
aef9ab47 | 618 | union jffs2_device_node dev; |
1da177e4 | 619 | int devlen = 0; |
9fe4854c | 620 | uint32_t alloclen; |
1da177e4 LT |
621 | int ret; |
622 | ||
aef9ab47 | 623 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
624 | return -EINVAL; |
625 | ||
626 | ri = jffs2_alloc_raw_inode(); | |
627 | if (!ri) | |
628 | return -ENOMEM; | |
182ec4ee | 629 | |
1da177e4 | 630 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 631 | |
aef9ab47 DW |
632 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
633 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
634 | |
635 | /* Try to reserve enough space for both node and dirent. | |
636 | * Just the node will do for now, though | |
1da177e4 LT |
637 | */ |
638 | namelen = dentry->d_name.len; | |
9fe4854c | 639 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 640 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
641 | |
642 | if (ret) { | |
643 | jffs2_free_raw_inode(ri); | |
644 | return ret; | |
645 | } | |
646 | ||
cfc8dc6f | 647 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
648 | |
649 | if (IS_ERR(inode)) { | |
650 | jffs2_free_raw_inode(ri); | |
651 | jffs2_complete_reservation(c); | |
652 | return PTR_ERR(inode); | |
653 | } | |
654 | inode->i_op = &jffs2_file_inode_operations; | |
655 | init_special_inode(inode, inode->i_mode, rdev); | |
656 | ||
657 | f = JFFS2_INODE_INFO(inode); | |
658 | ||
659 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
660 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
661 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
662 | ||
663 | ri->compr = JFFS2_COMPR_NONE; | |
664 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
665 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 666 | |
9fe4854c | 667 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
668 | |
669 | jffs2_free_raw_inode(ri); | |
670 | ||
671 | if (IS_ERR(fn)) { | |
672 | /* Eeek. Wave bye bye */ | |
ced22070 | 673 | mutex_unlock(&f->sem); |
1da177e4 | 674 | jffs2_complete_reservation(c); |
f324e4cb DW |
675 | ret = PTR_ERR(fn); |
676 | goto fail; | |
1da177e4 | 677 | } |
182ec4ee | 678 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
679 | obsoleted by the first data write |
680 | */ | |
681 | f->metadata = fn; | |
ced22070 | 682 | mutex_unlock(&f->sem); |
1da177e4 LT |
683 | |
684 | jffs2_complete_reservation(c); | |
aa98d7cf | 685 | |
2a7dba39 | 686 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
687 | if (ret) |
688 | goto fail; | |
689 | ||
cfc8dc6f | 690 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
691 | if (ret) |
692 | goto fail; | |
aa98d7cf | 693 | |
9fe4854c DW |
694 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
695 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
696 | if (ret) |
697 | goto fail; | |
1da177e4 LT |
698 | |
699 | rd = jffs2_alloc_raw_dirent(); | |
700 | if (!rd) { | |
701 | /* Argh. Now we treat it like a normal delete */ | |
702 | jffs2_complete_reservation(c); | |
f324e4cb DW |
703 | ret = -ENOMEM; |
704 | goto fail; | |
1da177e4 LT |
705 | } |
706 | ||
707 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 708 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
709 | |
710 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
711 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
712 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
713 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
714 | ||
715 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
716 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
717 | rd->ino = cpu_to_je32(inode->i_ino); | |
718 | rd->mctime = cpu_to_je32(get_seconds()); | |
719 | rd->nsize = namelen; | |
720 | ||
721 | /* XXX: This is ugly. */ | |
722 | rd->type = (mode & S_IFMT) >> 12; | |
723 | ||
724 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
725 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
726 | ||
9fe4854c | 727 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 728 | |
1da177e4 | 729 | if (IS_ERR(fd)) { |
182ec4ee | 730 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
731 | as if it were the final unlink() */ |
732 | jffs2_complete_reservation(c); | |
733 | jffs2_free_raw_dirent(rd); | |
ced22070 | 734 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
735 | ret = PTR_ERR(fd); |
736 | goto fail; | |
1da177e4 LT |
737 | } |
738 | ||
739 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
740 | ||
741 | jffs2_free_raw_dirent(rd); | |
742 | ||
743 | /* Link the fd into the inode's list, obsoleting an old | |
744 | one if necessary. */ | |
745 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
746 | ||
ced22070 | 747 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
748 | jffs2_complete_reservation(c); |
749 | ||
e72e6497 | 750 | unlock_new_inode(inode); |
8fc37ec5 | 751 | d_instantiate(dentry, inode); |
1da177e4 | 752 | return 0; |
f324e4cb DW |
753 | |
754 | fail: | |
41cce647 | 755 | iget_failed(inode); |
f324e4cb | 756 | return ret; |
1da177e4 LT |
757 | } |
758 | ||
759 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 760 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
761 | { |
762 | int ret; | |
763 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
764 | struct jffs2_inode_info *victim_f = NULL; | |
765 | uint8_t type; | |
3a69e0cd | 766 | uint32_t now; |
1da177e4 | 767 | |
182ec4ee | 768 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
769 | * file over a directory and vice versa, but if it's a directory, |
770 | * the VFS can't check whether the victim is empty. The filesystem | |
771 | * needs to do that for itself. | |
772 | */ | |
773 | if (new_dentry->d_inode) { | |
774 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
775 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
776 | struct jffs2_full_dirent *fd; | |
777 | ||
ced22070 | 778 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
779 | for (fd = victim_f->dents; fd; fd = fd->next) { |
780 | if (fd->ino) { | |
ced22070 | 781 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
782 | return -ENOTEMPTY; |
783 | } | |
784 | } | |
ced22070 | 785 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
786 | } |
787 | } | |
788 | ||
789 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 790 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
791 | then getting -ENOSPC, is quite bad :) |
792 | */ | |
793 | ||
794 | /* Make a hard link */ | |
182ec4ee | 795 | |
1da177e4 LT |
796 | /* XXX: This is ugly */ |
797 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
798 | if (!type) type = DT_REG; | |
799 | ||
3a69e0cd | 800 | now = get_seconds(); |
182ec4ee | 801 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 802 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 803 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
804 | |
805 | if (ret) | |
806 | return ret; | |
807 | ||
808 | if (victim_f) { | |
809 | /* There was a victim. Kill it off nicely */ | |
22ba747f AV |
810 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
811 | clear_nlink(new_dentry->d_inode); | |
812 | else | |
813 | drop_nlink(new_dentry->d_inode); | |
1da177e4 LT |
814 | /* Don't oops if the victim was a dirent pointing to an |
815 | inode which didn't exist. */ | |
816 | if (victim_f->inocache) { | |
ced22070 | 817 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
818 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
819 | victim_f->inocache->pino_nlink = 0; | |
820 | else | |
821 | victim_f->inocache->pino_nlink--; | |
ced22070 | 822 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
823 | } |
824 | } | |
825 | ||
182ec4ee | 826 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
827 | increase i_nlink on its new parent */ |
828 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 829 | inc_nlink(new_dir_i); |
1da177e4 LT |
830 | |
831 | /* Unlink the original */ | |
182ec4ee | 832 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 833 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
834 | |
835 | /* We don't touch inode->i_nlink */ | |
836 | ||
837 | if (ret) { | |
838 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
839 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 840 | mutex_lock(&f->sem); |
d8c76e6f | 841 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
842 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
843 | f->inocache->pino_nlink++; | |
ced22070 | 844 | mutex_unlock(&f->sem); |
1da177e4 | 845 | |
da320f05 JP |
846 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
847 | __func__, ret); | |
1da177e4 LT |
848 | /* Might as well let the VFS know */ |
849 | d_instantiate(new_dentry, old_dentry->d_inode); | |
7de9c6ee | 850 | ihold(old_dentry->d_inode); |
3a69e0cd | 851 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
852 | return ret; |
853 | } | |
854 | ||
855 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 856 | drop_nlink(old_dir_i); |
1da177e4 | 857 | |
3a69e0cd AB |
858 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
859 | ||
1da177e4 LT |
860 | return 0; |
861 | } | |
862 |