Commit | Line | Data |
---|---|---|
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, |
1da177e4 | 62 | .setattr = jffs2_setattr, |
aa98d7cf KK |
63 | .setxattr = jffs2_setxattr, |
64 | .getxattr = jffs2_getxattr, | |
65 | .listxattr = jffs2_listxattr, | |
66 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
67 | }; |
68 | ||
69 | /***********************************************************************/ | |
70 | ||
71 | ||
72 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 73 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
74 | nice and simple |
75 | */ | |
76 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
00cd8dd3 | 77 | unsigned int flags) |
1da177e4 LT |
78 | { |
79 | struct jffs2_inode_info *dir_f; | |
1da177e4 LT |
80 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
81 | uint32_t ino = 0; | |
82 | struct inode *inode = NULL; | |
83 | ||
9c261b33 | 84 | jffs2_dbg(1, "jffs2_lookup()\n"); |
1da177e4 | 85 | |
373d5e71 RP |
86 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
87 | return ERR_PTR(-ENAMETOOLONG); | |
88 | ||
1da177e4 | 89 | dir_f = JFFS2_INODE_INFO(dir_i); |
1da177e4 | 90 | |
ced22070 | 91 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
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; | |
ced22070 | 104 | mutex_unlock(&dir_f->sem); |
1da177e4 | 105 | if (ino) { |
5451f79f | 106 | inode = jffs2_iget(dir_i->i_sb, ino); |
a9049376 | 107 | if (IS_ERR(inode)) |
da320f05 | 108 | pr_warn("iget() failed for ino #%u\n", ino); |
1da177e4 LT |
109 | } |
110 | ||
8966c5e0 | 111 | return d_splice_alias(inode, target); |
1da177e4 LT |
112 | } |
113 | ||
114 | /***********************************************************************/ | |
115 | ||
116 | ||
0312fa7c | 117 | static int jffs2_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 118 | { |
0312fa7c AV |
119 | struct inode *inode = file_inode(file); |
120 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1da177e4 | 121 | struct jffs2_full_dirent *fd; |
0312fa7c | 122 | unsigned long curofs = 1; |
1da177e4 | 123 | |
0312fa7c | 124 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); |
1da177e4 | 125 | |
0312fa7c AV |
126 | if (!dir_emit_dots(file, ctx)) |
127 | return 0; | |
1da177e4 | 128 | |
ced22070 | 129 | mutex_lock(&f->sem); |
1da177e4 | 130 | for (fd = f->dents; fd; fd = fd->next) { |
1da177e4 | 131 | curofs++; |
0312fa7c AV |
132 | /* First loop: curofs = 2; pos = 2 */ |
133 | if (curofs < ctx->pos) { | |
9c261b33 | 134 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
0312fa7c | 135 | fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
1da177e4 LT |
136 | continue; |
137 | } | |
138 | if (!fd->ino) { | |
9c261b33 JP |
139 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
140 | fd->name); | |
0312fa7c | 141 | ctx->pos++; |
1da177e4 LT |
142 | continue; |
143 | } | |
9c261b33 | 144 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
0312fa7c AV |
145 | (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); |
146 | if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) | |
1da177e4 | 147 | break; |
0312fa7c | 148 | ctx->pos++; |
1da177e4 | 149 | } |
ced22070 | 150 | mutex_unlock(&f->sem); |
1da177e4 LT |
151 | return 0; |
152 | } | |
153 | ||
154 | /***********************************************************************/ | |
155 | ||
156 | ||
4acdaf27 | 157 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
ebfc3b49 | 158 | umode_t mode, bool excl) |
1da177e4 LT |
159 | { |
160 | struct jffs2_raw_inode *ri; | |
161 | struct jffs2_inode_info *f, *dir_f; | |
162 | struct jffs2_sb_info *c; | |
163 | struct inode *inode; | |
164 | int ret; | |
165 | ||
166 | ri = jffs2_alloc_raw_inode(); | |
167 | if (!ri) | |
168 | return -ENOMEM; | |
182ec4ee | 169 | |
1da177e4 LT |
170 | c = JFFS2_SB_INFO(dir_i->i_sb); |
171 | ||
9c261b33 | 172 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 173 | |
cfc8dc6f | 174 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
175 | |
176 | if (IS_ERR(inode)) { | |
9c261b33 | 177 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
178 | jffs2_free_raw_inode(ri); |
179 | return PTR_ERR(inode); | |
180 | } | |
181 | ||
182 | inode->i_op = &jffs2_file_inode_operations; | |
183 | inode->i_fop = &jffs2_file_operations; | |
184 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
185 | inode->i_mapping->nrpages = 0; | |
186 | ||
187 | f = JFFS2_INODE_INFO(inode); | |
188 | dir_f = JFFS2_INODE_INFO(dir_i); | |
189 | ||
590fe34c DW |
190 | /* jffs2_do_create() will want to lock it, _after_ reserving |
191 | space and taking c-alloc_sem. If we keep it locked here, | |
192 | lockdep gets unhappy (although it's a false positive; | |
193 | nothing else will be looking at this inode yet so there's | |
194 | no chance of AB-BA deadlock involving its f->sem). */ | |
195 | mutex_unlock(&f->sem); | |
196 | ||
2a7dba39 | 197 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
198 | if (ret) |
199 | goto fail; | |
1da177e4 LT |
200 | |
201 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
202 | ||
203 | jffs2_free_raw_inode(ri); | |
1da177e4 | 204 | |
9c261b33 JP |
205 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
206 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
207 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 | 208 | |
e72e6497 | 209 | unlock_new_inode(inode); |
8fc37ec5 | 210 | d_instantiate(dentry, inode); |
1da177e4 | 211 | return 0; |
aa98d7cf KK |
212 | |
213 | fail: | |
41cce647 | 214 | iget_failed(inode); |
aa98d7cf KK |
215 | jffs2_free_raw_inode(ri); |
216 | return ret; | |
1da177e4 LT |
217 | } |
218 | ||
219 | /***********************************************************************/ | |
220 | ||
221 | ||
222 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
223 | { | |
224 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
225 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
226 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
227 | int ret; | |
3a69e0cd | 228 | uint32_t now = get_seconds(); |
1da177e4 | 229 | |
182ec4ee | 230 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 231 | dentry->d_name.len, dead_f, now); |
1da177e4 | 232 | if (dead_f->inocache) |
bfe86848 | 233 | set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); |
3a69e0cd AB |
234 | if (!ret) |
235 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
236 | return ret; |
237 | } | |
238 | /***********************************************************************/ | |
239 | ||
240 | ||
241 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
242 | { | |
243 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
244 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
245 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
246 | int ret; | |
247 | uint8_t type; | |
3a69e0cd | 248 | uint32_t now; |
1da177e4 LT |
249 | |
250 | /* Don't let people make hard links to bad inodes. */ | |
251 | if (!f->inocache) | |
252 | return -EIO; | |
253 | ||
254 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
255 | return -EPERM; | |
256 | ||
257 | /* XXX: This is ugly */ | |
258 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
259 | if (!type) type = DT_REG; | |
260 | ||
3a69e0cd AB |
261 | now = get_seconds(); |
262 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
263 | |
264 | if (!ret) { | |
ced22070 | 265 | mutex_lock(&f->sem); |
bfe86848 | 266 | set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); |
ced22070 | 267 | mutex_unlock(&f->sem); |
1da177e4 | 268 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 269 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 270 | ihold(old_dentry->d_inode); |
1da177e4 LT |
271 | } |
272 | return ret; | |
273 | } | |
274 | ||
275 | /***********************************************************************/ | |
276 | ||
277 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
278 | { | |
279 | struct jffs2_inode_info *f, *dir_f; | |
280 | struct jffs2_sb_info *c; | |
281 | struct inode *inode; | |
282 | struct jffs2_raw_inode *ri; | |
283 | struct jffs2_raw_dirent *rd; | |
284 | struct jffs2_full_dnode *fn; | |
285 | struct jffs2_full_dirent *fd; | |
286 | int namelen; | |
9fe4854c | 287 | uint32_t alloclen; |
32f1a95d | 288 | int ret, targetlen = strlen(target); |
1da177e4 LT |
289 | |
290 | /* FIXME: If you care. We'd need to use frags for the target | |
291 | if it grows much more than this */ | |
32f1a95d | 292 | if (targetlen > 254) |
bde86fec | 293 | return -ENAMETOOLONG; |
1da177e4 LT |
294 | |
295 | ri = jffs2_alloc_raw_inode(); | |
296 | ||
297 | if (!ri) | |
298 | return -ENOMEM; | |
182ec4ee | 299 | |
1da177e4 | 300 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
301 | |
302 | /* Try to reserve enough space for both node and dirent. | |
303 | * Just the node will do for now, though | |
1da177e4 LT |
304 | */ |
305 | namelen = dentry->d_name.len; | |
9fe4854c DW |
306 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
307 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
308 | |
309 | if (ret) { | |
310 | jffs2_free_raw_inode(ri); | |
311 | return ret; | |
312 | } | |
313 | ||
cfc8dc6f | 314 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
315 | |
316 | if (IS_ERR(inode)) { | |
317 | jffs2_free_raw_inode(ri); | |
318 | jffs2_complete_reservation(c); | |
319 | return PTR_ERR(inode); | |
320 | } | |
321 | ||
322 | inode->i_op = &jffs2_symlink_inode_operations; | |
323 | ||
324 | f = JFFS2_INODE_INFO(inode); | |
325 | ||
32f1a95d | 326 | inode->i_size = targetlen; |
1da177e4 LT |
327 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
328 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
329 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
330 | ||
331 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 332 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 333 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 334 | |
9fe4854c | 335 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
336 | |
337 | jffs2_free_raw_inode(ri); | |
338 | ||
339 | if (IS_ERR(fn)) { | |
340 | /* Eeek. Wave bye bye */ | |
ced22070 | 341 | mutex_unlock(&f->sem); |
1da177e4 | 342 | jffs2_complete_reservation(c); |
f324e4cb DW |
343 | ret = PTR_ERR(fn); |
344 | goto fail; | |
1da177e4 | 345 | } |
32f1a95d | 346 | |
2b79adcc | 347 | /* We use f->target field to store the target path. */ |
04aadf36 | 348 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 349 | if (!f->target) { |
da320f05 | 350 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 351 | mutex_unlock(&f->sem); |
32f1a95d | 352 | jffs2_complete_reservation(c); |
f324e4cb DW |
353 | ret = -ENOMEM; |
354 | goto fail; | |
32f1a95d AB |
355 | } |
356 | ||
9c261b33 JP |
357 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
358 | __func__, (char *)f->target); | |
32f1a95d | 359 | |
182ec4ee | 360 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
361 | obsoleted by the first data write |
362 | */ | |
363 | f->metadata = fn; | |
ced22070 | 364 | mutex_unlock(&f->sem); |
1da177e4 LT |
365 | |
366 | jffs2_complete_reservation(c); | |
aa98d7cf | 367 | |
2a7dba39 | 368 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
369 | if (ret) |
370 | goto fail; | |
371 | ||
cfc8dc6f | 372 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
373 | if (ret) |
374 | goto fail; | |
aa98d7cf | 375 | |
9fe4854c DW |
376 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
377 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
378 | if (ret) |
379 | goto fail; | |
1da177e4 LT |
380 | |
381 | rd = jffs2_alloc_raw_dirent(); | |
382 | if (!rd) { | |
383 | /* Argh. Now we treat it like a normal delete */ | |
384 | jffs2_complete_reservation(c); | |
f324e4cb DW |
385 | ret = -ENOMEM; |
386 | goto fail; | |
1da177e4 LT |
387 | } |
388 | ||
389 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 390 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
391 | |
392 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
393 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
394 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
395 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
396 | ||
397 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
398 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
399 | rd->ino = cpu_to_je32(inode->i_ino); | |
400 | rd->mctime = cpu_to_je32(get_seconds()); | |
401 | rd->nsize = namelen; | |
402 | rd->type = DT_LNK; | |
403 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
404 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
405 | ||
9fe4854c | 406 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
407 | |
408 | if (IS_ERR(fd)) { | |
182ec4ee | 409 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
410 | as if it were the final unlink() */ |
411 | jffs2_complete_reservation(c); | |
412 | jffs2_free_raw_dirent(rd); | |
ced22070 | 413 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
414 | ret = PTR_ERR(fd); |
415 | goto fail; | |
1da177e4 LT |
416 | } |
417 | ||
418 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
419 | ||
420 | jffs2_free_raw_dirent(rd); | |
421 | ||
422 | /* Link the fd into the inode's list, obsoleting an old | |
423 | one if necessary. */ | |
424 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
425 | ||
ced22070 | 426 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
427 | jffs2_complete_reservation(c); |
428 | ||
e72e6497 | 429 | unlock_new_inode(inode); |
8fc37ec5 | 430 | d_instantiate(dentry, inode); |
1da177e4 | 431 | return 0; |
f324e4cb DW |
432 | |
433 | fail: | |
41cce647 | 434 | iget_failed(inode); |
f324e4cb | 435 | return ret; |
1da177e4 LT |
436 | } |
437 | ||
438 | ||
18bb1db3 | 439 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
440 | { |
441 | struct jffs2_inode_info *f, *dir_f; | |
442 | struct jffs2_sb_info *c; | |
443 | struct inode *inode; | |
444 | struct jffs2_raw_inode *ri; | |
445 | struct jffs2_raw_dirent *rd; | |
446 | struct jffs2_full_dnode *fn; | |
447 | struct jffs2_full_dirent *fd; | |
448 | int namelen; | |
9fe4854c | 449 | uint32_t alloclen; |
1da177e4 LT |
450 | int ret; |
451 | ||
452 | mode |= S_IFDIR; | |
453 | ||
454 | ri = jffs2_alloc_raw_inode(); | |
455 | if (!ri) | |
456 | return -ENOMEM; | |
182ec4ee | 457 | |
1da177e4 LT |
458 | c = JFFS2_SB_INFO(dir_i->i_sb); |
459 | ||
182ec4ee TG |
460 | /* Try to reserve enough space for both node and dirent. |
461 | * Just the node will do for now, though | |
1da177e4 LT |
462 | */ |
463 | namelen = dentry->d_name.len; | |
9fe4854c DW |
464 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
465 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
466 | |
467 | if (ret) { | |
468 | jffs2_free_raw_inode(ri); | |
469 | return ret; | |
470 | } | |
471 | ||
cfc8dc6f | 472 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
473 | |
474 | if (IS_ERR(inode)) { | |
475 | jffs2_free_raw_inode(ri); | |
476 | jffs2_complete_reservation(c); | |
477 | return PTR_ERR(inode); | |
478 | } | |
479 | ||
480 | inode->i_op = &jffs2_dir_inode_operations; | |
481 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
482 | |
483 | f = JFFS2_INODE_INFO(inode); | |
484 | ||
27c72b04 | 485 | /* Directories get nlink 2 at start */ |
bfe86848 | 486 | set_nlink(inode, 2); |
27c72b04 DW |
487 | /* but ic->pino_nlink is the parent ino# */ |
488 | f->inocache->pino_nlink = dir_i->i_ino; | |
489 | ||
1da177e4 LT |
490 | ri->data_crc = cpu_to_je32(0); |
491 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 492 | |
9fe4854c | 493 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
494 | |
495 | jffs2_free_raw_inode(ri); | |
496 | ||
497 | if (IS_ERR(fn)) { | |
498 | /* Eeek. Wave bye bye */ | |
ced22070 | 499 | mutex_unlock(&f->sem); |
1da177e4 | 500 | jffs2_complete_reservation(c); |
f324e4cb DW |
501 | ret = PTR_ERR(fn); |
502 | goto fail; | |
1da177e4 | 503 | } |
182ec4ee | 504 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
505 | obsoleted by the first data write |
506 | */ | |
507 | f->metadata = fn; | |
ced22070 | 508 | mutex_unlock(&f->sem); |
1da177e4 LT |
509 | |
510 | jffs2_complete_reservation(c); | |
aa98d7cf | 511 | |
2a7dba39 | 512 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
513 | if (ret) |
514 | goto fail; | |
515 | ||
cfc8dc6f | 516 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
517 | if (ret) |
518 | goto fail; | |
aa98d7cf | 519 | |
9fe4854c DW |
520 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
521 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
522 | if (ret) |
523 | goto fail; | |
182ec4ee | 524 | |
1da177e4 LT |
525 | rd = jffs2_alloc_raw_dirent(); |
526 | if (!rd) { | |
527 | /* Argh. Now we treat it like a normal delete */ | |
528 | jffs2_complete_reservation(c); | |
f324e4cb DW |
529 | ret = -ENOMEM; |
530 | goto fail; | |
1da177e4 LT |
531 | } |
532 | ||
533 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 534 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
535 | |
536 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
537 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
538 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
539 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
540 | ||
541 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
542 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
543 | rd->ino = cpu_to_je32(inode->i_ino); | |
544 | rd->mctime = cpu_to_je32(get_seconds()); | |
545 | rd->nsize = namelen; | |
546 | rd->type = DT_DIR; | |
547 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
548 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
549 | ||
9fe4854c | 550 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 551 | |
1da177e4 | 552 | if (IS_ERR(fd)) { |
182ec4ee | 553 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
554 | as if it were the final unlink() */ |
555 | jffs2_complete_reservation(c); | |
556 | jffs2_free_raw_dirent(rd); | |
ced22070 | 557 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
558 | ret = PTR_ERR(fd); |
559 | goto fail; | |
1da177e4 LT |
560 | } |
561 | ||
562 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 563 | inc_nlink(dir_i); |
1da177e4 LT |
564 | |
565 | jffs2_free_raw_dirent(rd); | |
566 | ||
567 | /* Link the fd into the inode's list, obsoleting an old | |
568 | one if necessary. */ | |
569 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
570 | ||
ced22070 | 571 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
572 | jffs2_complete_reservation(c); |
573 | ||
e72e6497 | 574 | unlock_new_inode(inode); |
8fc37ec5 | 575 | d_instantiate(dentry, inode); |
1da177e4 | 576 | return 0; |
f324e4cb DW |
577 | |
578 | fail: | |
41cce647 | 579 | iget_failed(inode); |
f324e4cb | 580 | return ret; |
1da177e4 LT |
581 | } |
582 | ||
583 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
584 | { | |
27c72b04 DW |
585 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
586 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
587 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
588 | struct jffs2_full_dirent *fd; | |
589 | int ret; | |
27c72b04 | 590 | uint32_t now = get_seconds(); |
1da177e4 LT |
591 | |
592 | for (fd = f->dents ; fd; fd = fd->next) { | |
593 | if (fd->ino) | |
594 | return -ENOTEMPTY; | |
595 | } | |
27c72b04 DW |
596 | |
597 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
598 | dentry->d_name.len, f, now); | |
599 | if (!ret) { | |
600 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
601 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 602 | drop_nlink(dir_i); |
27c72b04 | 603 | } |
1da177e4 LT |
604 | return ret; |
605 | } | |
606 | ||
1a67aafb | 607 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
608 | { |
609 | struct jffs2_inode_info *f, *dir_f; | |
610 | struct jffs2_sb_info *c; | |
611 | struct inode *inode; | |
612 | struct jffs2_raw_inode *ri; | |
613 | struct jffs2_raw_dirent *rd; | |
614 | struct jffs2_full_dnode *fn; | |
615 | struct jffs2_full_dirent *fd; | |
616 | int namelen; | |
aef9ab47 | 617 | union jffs2_device_node dev; |
1da177e4 | 618 | int devlen = 0; |
9fe4854c | 619 | uint32_t alloclen; |
1da177e4 LT |
620 | int ret; |
621 | ||
aef9ab47 | 622 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
623 | return -EINVAL; |
624 | ||
625 | ri = jffs2_alloc_raw_inode(); | |
626 | if (!ri) | |
627 | return -ENOMEM; | |
182ec4ee | 628 | |
1da177e4 | 629 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 630 | |
aef9ab47 DW |
631 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
632 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
633 | |
634 | /* Try to reserve enough space for both node and dirent. | |
635 | * Just the node will do for now, though | |
1da177e4 LT |
636 | */ |
637 | namelen = dentry->d_name.len; | |
9fe4854c | 638 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 639 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
640 | |
641 | if (ret) { | |
642 | jffs2_free_raw_inode(ri); | |
643 | return ret; | |
644 | } | |
645 | ||
cfc8dc6f | 646 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
647 | |
648 | if (IS_ERR(inode)) { | |
649 | jffs2_free_raw_inode(ri); | |
650 | jffs2_complete_reservation(c); | |
651 | return PTR_ERR(inode); | |
652 | } | |
653 | inode->i_op = &jffs2_file_inode_operations; | |
654 | init_special_inode(inode, inode->i_mode, rdev); | |
655 | ||
656 | f = JFFS2_INODE_INFO(inode); | |
657 | ||
658 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
659 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
660 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
661 | ||
662 | ri->compr = JFFS2_COMPR_NONE; | |
663 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
664 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 665 | |
9fe4854c | 666 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
667 | |
668 | jffs2_free_raw_inode(ri); | |
669 | ||
670 | if (IS_ERR(fn)) { | |
671 | /* Eeek. Wave bye bye */ | |
ced22070 | 672 | mutex_unlock(&f->sem); |
1da177e4 | 673 | jffs2_complete_reservation(c); |
f324e4cb DW |
674 | ret = PTR_ERR(fn); |
675 | goto fail; | |
1da177e4 | 676 | } |
182ec4ee | 677 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
678 | obsoleted by the first data write |
679 | */ | |
680 | f->metadata = fn; | |
ced22070 | 681 | mutex_unlock(&f->sem); |
1da177e4 LT |
682 | |
683 | jffs2_complete_reservation(c); | |
aa98d7cf | 684 | |
2a7dba39 | 685 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
686 | if (ret) |
687 | goto fail; | |
688 | ||
cfc8dc6f | 689 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
690 | if (ret) |
691 | goto fail; | |
aa98d7cf | 692 | |
9fe4854c DW |
693 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
694 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
695 | if (ret) |
696 | goto fail; | |
1da177e4 LT |
697 | |
698 | rd = jffs2_alloc_raw_dirent(); | |
699 | if (!rd) { | |
700 | /* Argh. Now we treat it like a normal delete */ | |
701 | jffs2_complete_reservation(c); | |
f324e4cb DW |
702 | ret = -ENOMEM; |
703 | goto fail; | |
1da177e4 LT |
704 | } |
705 | ||
706 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 707 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
708 | |
709 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
710 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
711 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
712 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
713 | ||
714 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
715 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
716 | rd->ino = cpu_to_je32(inode->i_ino); | |
717 | rd->mctime = cpu_to_je32(get_seconds()); | |
718 | rd->nsize = namelen; | |
719 | ||
720 | /* XXX: This is ugly. */ | |
721 | rd->type = (mode & S_IFMT) >> 12; | |
722 | ||
723 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
724 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
725 | ||
9fe4854c | 726 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 727 | |
1da177e4 | 728 | if (IS_ERR(fd)) { |
182ec4ee | 729 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
730 | as if it were the final unlink() */ |
731 | jffs2_complete_reservation(c); | |
732 | jffs2_free_raw_dirent(rd); | |
ced22070 | 733 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
734 | ret = PTR_ERR(fd); |
735 | goto fail; | |
1da177e4 LT |
736 | } |
737 | ||
738 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
739 | ||
740 | jffs2_free_raw_dirent(rd); | |
741 | ||
742 | /* Link the fd into the inode's list, obsoleting an old | |
743 | one if necessary. */ | |
744 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
745 | ||
ced22070 | 746 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
747 | jffs2_complete_reservation(c); |
748 | ||
e72e6497 | 749 | unlock_new_inode(inode); |
8fc37ec5 | 750 | d_instantiate(dentry, inode); |
1da177e4 | 751 | return 0; |
f324e4cb DW |
752 | |
753 | fail: | |
41cce647 | 754 | iget_failed(inode); |
f324e4cb | 755 | return ret; |
1da177e4 LT |
756 | } |
757 | ||
758 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 759 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
760 | { |
761 | int ret; | |
762 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
763 | struct jffs2_inode_info *victim_f = NULL; | |
764 | uint8_t type; | |
3a69e0cd | 765 | uint32_t now; |
1da177e4 | 766 | |
182ec4ee | 767 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
768 | * file over a directory and vice versa, but if it's a directory, |
769 | * the VFS can't check whether the victim is empty. The filesystem | |
770 | * needs to do that for itself. | |
771 | */ | |
772 | if (new_dentry->d_inode) { | |
773 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
774 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
775 | struct jffs2_full_dirent *fd; | |
776 | ||
ced22070 | 777 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
778 | for (fd = victim_f->dents; fd; fd = fd->next) { |
779 | if (fd->ino) { | |
ced22070 | 780 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
781 | return -ENOTEMPTY; |
782 | } | |
783 | } | |
ced22070 | 784 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
785 | } |
786 | } | |
787 | ||
788 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 789 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
790 | then getting -ENOSPC, is quite bad :) |
791 | */ | |
792 | ||
793 | /* Make a hard link */ | |
182ec4ee | 794 | |
1da177e4 LT |
795 | /* XXX: This is ugly */ |
796 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
797 | if (!type) type = DT_REG; | |
798 | ||
3a69e0cd | 799 | now = get_seconds(); |
182ec4ee | 800 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 801 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 802 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
803 | |
804 | if (ret) | |
805 | return ret; | |
806 | ||
807 | if (victim_f) { | |
808 | /* There was a victim. Kill it off nicely */ | |
22ba747f AV |
809 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
810 | clear_nlink(new_dentry->d_inode); | |
811 | else | |
812 | drop_nlink(new_dentry->d_inode); | |
1da177e4 LT |
813 | /* Don't oops if the victim was a dirent pointing to an |
814 | inode which didn't exist. */ | |
815 | if (victim_f->inocache) { | |
ced22070 | 816 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
817 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
818 | victim_f->inocache->pino_nlink = 0; | |
819 | else | |
820 | victim_f->inocache->pino_nlink--; | |
ced22070 | 821 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
822 | } |
823 | } | |
824 | ||
182ec4ee | 825 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
826 | increase i_nlink on its new parent */ |
827 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 828 | inc_nlink(new_dir_i); |
1da177e4 LT |
829 | |
830 | /* Unlink the original */ | |
182ec4ee | 831 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 832 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
833 | |
834 | /* We don't touch inode->i_nlink */ | |
835 | ||
836 | if (ret) { | |
837 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
838 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 839 | mutex_lock(&f->sem); |
d8c76e6f | 840 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
841 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
842 | f->inocache->pino_nlink++; | |
ced22070 | 843 | mutex_unlock(&f->sem); |
1da177e4 | 844 | |
da320f05 JP |
845 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
846 | __func__, ret); | |
1da177e4 LT |
847 | /* Might as well let the VFS know */ |
848 | d_instantiate(new_dentry, old_dentry->d_inode); | |
7de9c6ee | 849 | ihold(old_dentry->d_inode); |
3a69e0cd | 850 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
851 | return ret; |
852 | } | |
853 | ||
854 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 855 | drop_nlink(old_dir_i); |
1da177e4 | 856 | |
3a69e0cd AB |
857 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
858 | ||
1da177e4 LT |
859 | return 0; |
860 | } | |
861 |