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 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/slab.h> | |
1da177e4 LT |
15 | #include <linux/fs.h> |
16 | #include <linux/crc32.h> | |
17 | #include <linux/jffs2.h> | |
cbb9a561 DW |
18 | #include "jffs2_fs_i.h" |
19 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
20 | #include <linux/time.h> |
21 | #include "nodelist.h" | |
22 | ||
1da177e4 LT |
23 | static int jffs2_readdir (struct file *, void *, filldir_t); |
24 | ||
4acdaf27 | 25 | static int jffs2_create (struct inode *,struct dentry *,umode_t, |
1da177e4 LT |
26 | struct nameidata *); |
27 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, | |
28 | struct nameidata *); | |
29 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); | |
30 | static int jffs2_unlink (struct inode *,struct dentry *); | |
31 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 32 | static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); |
1da177e4 | 33 | static int jffs2_rmdir (struct inode *,struct dentry *); |
1a67aafb | 34 | static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 35 | static int jffs2_rename (struct inode *, struct dentry *, |
ef53cb02 | 36 | struct inode *, struct dentry *); |
1da177e4 | 37 | |
4b6f5d20 | 38 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
39 | { |
40 | .read = generic_read_dir, | |
41 | .readdir = jffs2_readdir, | |
0533400b | 42 | .unlocked_ioctl=jffs2_ioctl, |
3222a3e5 CH |
43 | .fsync = jffs2_fsync, |
44 | .llseek = generic_file_llseek, | |
1da177e4 LT |
45 | }; |
46 | ||
47 | ||
92e1d5be | 48 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 49 | { |
265489f0 DW |
50 | .create = jffs2_create, |
51 | .lookup = jffs2_lookup, | |
1da177e4 LT |
52 | .link = jffs2_link, |
53 | .unlink = jffs2_unlink, | |
54 | .symlink = jffs2_symlink, | |
55 | .mkdir = jffs2_mkdir, | |
56 | .rmdir = jffs2_rmdir, | |
57 | .mknod = jffs2_mknod, | |
58 | .rename = jffs2_rename, | |
4e34e719 | 59 | .get_acl = jffs2_get_acl, |
1da177e4 | 60 | .setattr = jffs2_setattr, |
aa98d7cf KK |
61 | .setxattr = jffs2_setxattr, |
62 | .getxattr = jffs2_getxattr, | |
63 | .listxattr = jffs2_listxattr, | |
64 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
65 | }; |
66 | ||
67 | /***********************************************************************/ | |
68 | ||
69 | ||
70 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 71 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
72 | nice and simple |
73 | */ | |
74 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
75 | struct nameidata *nd) | |
76 | { | |
77 | struct jffs2_inode_info *dir_f; | |
1da177e4 LT |
78 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
79 | uint32_t ino = 0; | |
80 | struct inode *inode = NULL; | |
81 | ||
9c261b33 | 82 | jffs2_dbg(1, "jffs2_lookup()\n"); |
1da177e4 | 83 | |
373d5e71 RP |
84 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
85 | return ERR_PTR(-ENAMETOOLONG); | |
86 | ||
1da177e4 | 87 | dir_f = JFFS2_INODE_INFO(dir_i); |
1da177e4 | 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 | 104 | inode = jffs2_iget(dir_i->i_sb, ino); |
a9049376 | 105 | if (IS_ERR(inode)) |
1da177e4 | 106 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
1da177e4 LT |
107 | } |
108 | ||
8966c5e0 | 109 | return d_splice_alias(inode, target); |
1da177e4 LT |
110 | } |
111 | ||
112 | /***********************************************************************/ | |
113 | ||
114 | ||
115 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
116 | { | |
117 | struct jffs2_inode_info *f; | |
ec2e203c | 118 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
119 | struct jffs2_full_dirent *fd; |
120 | unsigned long offset, curofs; | |
121 | ||
9c261b33 JP |
122 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", |
123 | filp->f_path.dentry->d_inode->i_ino); | |
1da177e4 LT |
124 | |
125 | f = JFFS2_INODE_INFO(inode); | |
1da177e4 LT |
126 | |
127 | offset = filp->f_pos; | |
128 | ||
129 | if (offset == 0) { | |
9c261b33 | 130 | jffs2_dbg(1, "Dirent 0: \".\", ino #%lu\n", inode->i_ino); |
1da177e4 LT |
131 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
132 | goto out; | |
133 | offset++; | |
134 | } | |
135 | if (offset == 1) { | |
ec2e203c | 136 | unsigned long pino = parent_ino(filp->f_path.dentry); |
9c261b33 | 137 | jffs2_dbg(1, "Dirent 1: \"..\", ino #%lu\n", pino); |
1da177e4 LT |
138 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) |
139 | goto out; | |
140 | offset++; | |
141 | } | |
142 | ||
143 | curofs=1; | |
ced22070 | 144 | mutex_lock(&f->sem); |
1da177e4 LT |
145 | for (fd = f->dents; fd; fd = fd->next) { |
146 | ||
147 | curofs++; | |
148 | /* First loop: curofs = 2; offset = 2 */ | |
149 | if (curofs < offset) { | |
9c261b33 JP |
150 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
151 | fd->name, fd->ino, fd->type, curofs, offset); | |
1da177e4 LT |
152 | continue; |
153 | } | |
154 | if (!fd->ino) { | |
9c261b33 JP |
155 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
156 | fd->name); | |
1da177e4 LT |
157 | offset++; |
158 | continue; | |
159 | } | |
9c261b33 JP |
160 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
161 | offset, fd->name, fd->ino, fd->type); | |
1da177e4 LT |
162 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) |
163 | break; | |
164 | offset++; | |
165 | } | |
ced22070 | 166 | mutex_unlock(&f->sem); |
1da177e4 LT |
167 | out: |
168 | filp->f_pos = offset; | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /***********************************************************************/ | |
173 | ||
174 | ||
4acdaf27 AV |
175 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
176 | umode_t mode, struct nameidata *nd) | |
1da177e4 LT |
177 | { |
178 | struct jffs2_raw_inode *ri; | |
179 | struct jffs2_inode_info *f, *dir_f; | |
180 | struct jffs2_sb_info *c; | |
181 | struct inode *inode; | |
182 | int ret; | |
183 | ||
184 | ri = jffs2_alloc_raw_inode(); | |
185 | if (!ri) | |
186 | return -ENOMEM; | |
182ec4ee | 187 | |
1da177e4 LT |
188 | c = JFFS2_SB_INFO(dir_i->i_sb); |
189 | ||
9c261b33 | 190 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 191 | |
cfc8dc6f | 192 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
193 | |
194 | if (IS_ERR(inode)) { | |
9c261b33 | 195 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
196 | jffs2_free_raw_inode(ri); |
197 | return PTR_ERR(inode); | |
198 | } | |
199 | ||
200 | inode->i_op = &jffs2_file_inode_operations; | |
201 | inode->i_fop = &jffs2_file_operations; | |
202 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
203 | inode->i_mapping->nrpages = 0; | |
204 | ||
205 | f = JFFS2_INODE_INFO(inode); | |
206 | dir_f = JFFS2_INODE_INFO(dir_i); | |
207 | ||
590fe34c DW |
208 | /* jffs2_do_create() will want to lock it, _after_ reserving |
209 | space and taking c-alloc_sem. If we keep it locked here, | |
210 | lockdep gets unhappy (although it's a false positive; | |
211 | nothing else will be looking at this inode yet so there's | |
212 | no chance of AB-BA deadlock involving its f->sem). */ | |
213 | mutex_unlock(&f->sem); | |
214 | ||
2a7dba39 | 215 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
216 | if (ret) |
217 | goto fail; | |
1da177e4 LT |
218 | |
219 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
220 | ||
221 | jffs2_free_raw_inode(ri); | |
1da177e4 | 222 | |
9c261b33 JP |
223 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
224 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
225 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 DW |
226 | |
227 | d_instantiate(dentry, inode); | |
228 | unlock_new_inode(inode); | |
1da177e4 | 229 | return 0; |
aa98d7cf KK |
230 | |
231 | fail: | |
41cce647 | 232 | iget_failed(inode); |
aa98d7cf KK |
233 | jffs2_free_raw_inode(ri); |
234 | return ret; | |
1da177e4 LT |
235 | } |
236 | ||
237 | /***********************************************************************/ | |
238 | ||
239 | ||
240 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
241 | { | |
242 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
243 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
244 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
245 | int ret; | |
3a69e0cd | 246 | uint32_t now = get_seconds(); |
1da177e4 | 247 | |
182ec4ee | 248 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 249 | dentry->d_name.len, dead_f, now); |
1da177e4 | 250 | if (dead_f->inocache) |
bfe86848 | 251 | set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); |
3a69e0cd AB |
252 | if (!ret) |
253 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
254 | return ret; |
255 | } | |
256 | /***********************************************************************/ | |
257 | ||
258 | ||
259 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
260 | { | |
261 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
262 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
263 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
264 | int ret; | |
265 | uint8_t type; | |
3a69e0cd | 266 | uint32_t now; |
1da177e4 LT |
267 | |
268 | /* Don't let people make hard links to bad inodes. */ | |
269 | if (!f->inocache) | |
270 | return -EIO; | |
271 | ||
272 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
273 | return -EPERM; | |
274 | ||
275 | /* XXX: This is ugly */ | |
276 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
277 | if (!type) type = DT_REG; | |
278 | ||
3a69e0cd AB |
279 | now = get_seconds(); |
280 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
281 | |
282 | if (!ret) { | |
ced22070 | 283 | mutex_lock(&f->sem); |
bfe86848 | 284 | set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); |
ced22070 | 285 | mutex_unlock(&f->sem); |
1da177e4 | 286 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 287 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 288 | ihold(old_dentry->d_inode); |
1da177e4 LT |
289 | } |
290 | return ret; | |
291 | } | |
292 | ||
293 | /***********************************************************************/ | |
294 | ||
295 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
296 | { | |
297 | struct jffs2_inode_info *f, *dir_f; | |
298 | struct jffs2_sb_info *c; | |
299 | struct inode *inode; | |
300 | struct jffs2_raw_inode *ri; | |
301 | struct jffs2_raw_dirent *rd; | |
302 | struct jffs2_full_dnode *fn; | |
303 | struct jffs2_full_dirent *fd; | |
304 | int namelen; | |
9fe4854c | 305 | uint32_t alloclen; |
32f1a95d | 306 | int ret, targetlen = strlen(target); |
1da177e4 LT |
307 | |
308 | /* FIXME: If you care. We'd need to use frags for the target | |
309 | if it grows much more than this */ | |
32f1a95d | 310 | if (targetlen > 254) |
bde86fec | 311 | return -ENAMETOOLONG; |
1da177e4 LT |
312 | |
313 | ri = jffs2_alloc_raw_inode(); | |
314 | ||
315 | if (!ri) | |
316 | return -ENOMEM; | |
182ec4ee | 317 | |
1da177e4 | 318 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
319 | |
320 | /* Try to reserve enough space for both node and dirent. | |
321 | * Just the node will do for now, though | |
1da177e4 LT |
322 | */ |
323 | namelen = dentry->d_name.len; | |
9fe4854c DW |
324 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
325 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
326 | |
327 | if (ret) { | |
328 | jffs2_free_raw_inode(ri); | |
329 | return ret; | |
330 | } | |
331 | ||
cfc8dc6f | 332 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
333 | |
334 | if (IS_ERR(inode)) { | |
335 | jffs2_free_raw_inode(ri); | |
336 | jffs2_complete_reservation(c); | |
337 | return PTR_ERR(inode); | |
338 | } | |
339 | ||
340 | inode->i_op = &jffs2_symlink_inode_operations; | |
341 | ||
342 | f = JFFS2_INODE_INFO(inode); | |
343 | ||
32f1a95d | 344 | inode->i_size = targetlen; |
1da177e4 LT |
345 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
346 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
347 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
348 | ||
349 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 350 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 351 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 352 | |
9fe4854c | 353 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
354 | |
355 | jffs2_free_raw_inode(ri); | |
356 | ||
357 | if (IS_ERR(fn)) { | |
358 | /* Eeek. Wave bye bye */ | |
ced22070 | 359 | mutex_unlock(&f->sem); |
1da177e4 | 360 | jffs2_complete_reservation(c); |
f324e4cb DW |
361 | ret = PTR_ERR(fn); |
362 | goto fail; | |
1da177e4 | 363 | } |
32f1a95d | 364 | |
2b79adcc | 365 | /* We use f->target field to store the target path. */ |
04aadf36 | 366 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 367 | if (!f->target) { |
32f1a95d | 368 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 369 | mutex_unlock(&f->sem); |
32f1a95d | 370 | jffs2_complete_reservation(c); |
f324e4cb DW |
371 | ret = -ENOMEM; |
372 | goto fail; | |
32f1a95d AB |
373 | } |
374 | ||
9c261b33 JP |
375 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
376 | __func__, (char *)f->target); | |
32f1a95d | 377 | |
182ec4ee | 378 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
379 | obsoleted by the first data write |
380 | */ | |
381 | f->metadata = fn; | |
ced22070 | 382 | mutex_unlock(&f->sem); |
1da177e4 LT |
383 | |
384 | jffs2_complete_reservation(c); | |
aa98d7cf | 385 | |
2a7dba39 | 386 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
387 | if (ret) |
388 | goto fail; | |
389 | ||
cfc8dc6f | 390 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
391 | if (ret) |
392 | goto fail; | |
aa98d7cf | 393 | |
9fe4854c DW |
394 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
395 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
396 | if (ret) |
397 | goto fail; | |
1da177e4 LT |
398 | |
399 | rd = jffs2_alloc_raw_dirent(); | |
400 | if (!rd) { | |
401 | /* Argh. Now we treat it like a normal delete */ | |
402 | jffs2_complete_reservation(c); | |
f324e4cb DW |
403 | ret = -ENOMEM; |
404 | goto fail; | |
1da177e4 LT |
405 | } |
406 | ||
407 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 408 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
409 | |
410 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
411 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
412 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
413 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
414 | ||
415 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
416 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
417 | rd->ino = cpu_to_je32(inode->i_ino); | |
418 | rd->mctime = cpu_to_je32(get_seconds()); | |
419 | rd->nsize = namelen; | |
420 | rd->type = DT_LNK; | |
421 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
422 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
423 | ||
9fe4854c | 424 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
425 | |
426 | if (IS_ERR(fd)) { | |
182ec4ee | 427 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
428 | as if it were the final unlink() */ |
429 | jffs2_complete_reservation(c); | |
430 | jffs2_free_raw_dirent(rd); | |
ced22070 | 431 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
432 | ret = PTR_ERR(fd); |
433 | goto fail; | |
1da177e4 LT |
434 | } |
435 | ||
436 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
437 | ||
438 | jffs2_free_raw_dirent(rd); | |
439 | ||
440 | /* Link the fd into the inode's list, obsoleting an old | |
441 | one if necessary. */ | |
442 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
443 | ||
ced22070 | 444 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
445 | jffs2_complete_reservation(c); |
446 | ||
447 | d_instantiate(dentry, inode); | |
e72e6497 | 448 | unlock_new_inode(inode); |
1da177e4 | 449 | return 0; |
f324e4cb DW |
450 | |
451 | fail: | |
41cce647 | 452 | iget_failed(inode); |
f324e4cb | 453 | return ret; |
1da177e4 LT |
454 | } |
455 | ||
456 | ||
18bb1db3 | 457 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
458 | { |
459 | struct jffs2_inode_info *f, *dir_f; | |
460 | struct jffs2_sb_info *c; | |
461 | struct inode *inode; | |
462 | struct jffs2_raw_inode *ri; | |
463 | struct jffs2_raw_dirent *rd; | |
464 | struct jffs2_full_dnode *fn; | |
465 | struct jffs2_full_dirent *fd; | |
466 | int namelen; | |
9fe4854c | 467 | uint32_t alloclen; |
1da177e4 LT |
468 | int ret; |
469 | ||
470 | mode |= S_IFDIR; | |
471 | ||
472 | ri = jffs2_alloc_raw_inode(); | |
473 | if (!ri) | |
474 | return -ENOMEM; | |
182ec4ee | 475 | |
1da177e4 LT |
476 | c = JFFS2_SB_INFO(dir_i->i_sb); |
477 | ||
182ec4ee TG |
478 | /* Try to reserve enough space for both node and dirent. |
479 | * Just the node will do for now, though | |
1da177e4 LT |
480 | */ |
481 | namelen = dentry->d_name.len; | |
9fe4854c DW |
482 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
483 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
484 | |
485 | if (ret) { | |
486 | jffs2_free_raw_inode(ri); | |
487 | return ret; | |
488 | } | |
489 | ||
cfc8dc6f | 490 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
491 | |
492 | if (IS_ERR(inode)) { | |
493 | jffs2_free_raw_inode(ri); | |
494 | jffs2_complete_reservation(c); | |
495 | return PTR_ERR(inode); | |
496 | } | |
497 | ||
498 | inode->i_op = &jffs2_dir_inode_operations; | |
499 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
500 | |
501 | f = JFFS2_INODE_INFO(inode); | |
502 | ||
27c72b04 | 503 | /* Directories get nlink 2 at start */ |
bfe86848 | 504 | set_nlink(inode, 2); |
27c72b04 DW |
505 | /* but ic->pino_nlink is the parent ino# */ |
506 | f->inocache->pino_nlink = dir_i->i_ino; | |
507 | ||
1da177e4 LT |
508 | ri->data_crc = cpu_to_je32(0); |
509 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 510 | |
9fe4854c | 511 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
512 | |
513 | jffs2_free_raw_inode(ri); | |
514 | ||
515 | if (IS_ERR(fn)) { | |
516 | /* Eeek. Wave bye bye */ | |
ced22070 | 517 | mutex_unlock(&f->sem); |
1da177e4 | 518 | jffs2_complete_reservation(c); |
f324e4cb DW |
519 | ret = PTR_ERR(fn); |
520 | goto fail; | |
1da177e4 | 521 | } |
182ec4ee | 522 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
523 | obsoleted by the first data write |
524 | */ | |
525 | f->metadata = fn; | |
ced22070 | 526 | mutex_unlock(&f->sem); |
1da177e4 LT |
527 | |
528 | jffs2_complete_reservation(c); | |
aa98d7cf | 529 | |
2a7dba39 | 530 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
531 | if (ret) |
532 | goto fail; | |
533 | ||
cfc8dc6f | 534 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
535 | if (ret) |
536 | goto fail; | |
aa98d7cf | 537 | |
9fe4854c DW |
538 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
539 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
540 | if (ret) |
541 | goto fail; | |
182ec4ee | 542 | |
1da177e4 LT |
543 | rd = jffs2_alloc_raw_dirent(); |
544 | if (!rd) { | |
545 | /* Argh. Now we treat it like a normal delete */ | |
546 | jffs2_complete_reservation(c); | |
f324e4cb DW |
547 | ret = -ENOMEM; |
548 | goto fail; | |
1da177e4 LT |
549 | } |
550 | ||
551 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 552 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
553 | |
554 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
555 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
556 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
557 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
558 | ||
559 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
560 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
561 | rd->ino = cpu_to_je32(inode->i_ino); | |
562 | rd->mctime = cpu_to_je32(get_seconds()); | |
563 | rd->nsize = namelen; | |
564 | rd->type = DT_DIR; | |
565 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
566 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
567 | ||
9fe4854c | 568 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 569 | |
1da177e4 | 570 | if (IS_ERR(fd)) { |
182ec4ee | 571 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
572 | as if it were the final unlink() */ |
573 | jffs2_complete_reservation(c); | |
574 | jffs2_free_raw_dirent(rd); | |
ced22070 | 575 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
576 | ret = PTR_ERR(fd); |
577 | goto fail; | |
1da177e4 LT |
578 | } |
579 | ||
580 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 581 | inc_nlink(dir_i); |
1da177e4 LT |
582 | |
583 | jffs2_free_raw_dirent(rd); | |
584 | ||
585 | /* Link the fd into the inode's list, obsoleting an old | |
586 | one if necessary. */ | |
587 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
588 | ||
ced22070 | 589 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
590 | jffs2_complete_reservation(c); |
591 | ||
592 | d_instantiate(dentry, inode); | |
e72e6497 | 593 | unlock_new_inode(inode); |
1da177e4 | 594 | return 0; |
f324e4cb DW |
595 | |
596 | fail: | |
41cce647 | 597 | iget_failed(inode); |
f324e4cb | 598 | return ret; |
1da177e4 LT |
599 | } |
600 | ||
601 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
602 | { | |
27c72b04 DW |
603 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
604 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
605 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
606 | struct jffs2_full_dirent *fd; | |
607 | int ret; | |
27c72b04 | 608 | uint32_t now = get_seconds(); |
1da177e4 LT |
609 | |
610 | for (fd = f->dents ; fd; fd = fd->next) { | |
611 | if (fd->ino) | |
612 | return -ENOTEMPTY; | |
613 | } | |
27c72b04 DW |
614 | |
615 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
616 | dentry->d_name.len, f, now); | |
617 | if (!ret) { | |
618 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
619 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 620 | drop_nlink(dir_i); |
27c72b04 | 621 | } |
1da177e4 LT |
622 | return ret; |
623 | } | |
624 | ||
1a67aafb | 625 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
626 | { |
627 | struct jffs2_inode_info *f, *dir_f; | |
628 | struct jffs2_sb_info *c; | |
629 | struct inode *inode; | |
630 | struct jffs2_raw_inode *ri; | |
631 | struct jffs2_raw_dirent *rd; | |
632 | struct jffs2_full_dnode *fn; | |
633 | struct jffs2_full_dirent *fd; | |
634 | int namelen; | |
aef9ab47 | 635 | union jffs2_device_node dev; |
1da177e4 | 636 | int devlen = 0; |
9fe4854c | 637 | uint32_t alloclen; |
1da177e4 LT |
638 | int ret; |
639 | ||
aef9ab47 | 640 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
641 | return -EINVAL; |
642 | ||
643 | ri = jffs2_alloc_raw_inode(); | |
644 | if (!ri) | |
645 | return -ENOMEM; | |
182ec4ee | 646 | |
1da177e4 | 647 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 648 | |
aef9ab47 DW |
649 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
650 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
651 | |
652 | /* Try to reserve enough space for both node and dirent. | |
653 | * Just the node will do for now, though | |
1da177e4 LT |
654 | */ |
655 | namelen = dentry->d_name.len; | |
9fe4854c | 656 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 657 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
658 | |
659 | if (ret) { | |
660 | jffs2_free_raw_inode(ri); | |
661 | return ret; | |
662 | } | |
663 | ||
cfc8dc6f | 664 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
665 | |
666 | if (IS_ERR(inode)) { | |
667 | jffs2_free_raw_inode(ri); | |
668 | jffs2_complete_reservation(c); | |
669 | return PTR_ERR(inode); | |
670 | } | |
671 | inode->i_op = &jffs2_file_inode_operations; | |
672 | init_special_inode(inode, inode->i_mode, rdev); | |
673 | ||
674 | f = JFFS2_INODE_INFO(inode); | |
675 | ||
676 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
677 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
678 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
679 | ||
680 | ri->compr = JFFS2_COMPR_NONE; | |
681 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
682 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 683 | |
9fe4854c | 684 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
685 | |
686 | jffs2_free_raw_inode(ri); | |
687 | ||
688 | if (IS_ERR(fn)) { | |
689 | /* Eeek. Wave bye bye */ | |
ced22070 | 690 | mutex_unlock(&f->sem); |
1da177e4 | 691 | jffs2_complete_reservation(c); |
f324e4cb DW |
692 | ret = PTR_ERR(fn); |
693 | goto fail; | |
1da177e4 | 694 | } |
182ec4ee | 695 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
696 | obsoleted by the first data write |
697 | */ | |
698 | f->metadata = fn; | |
ced22070 | 699 | mutex_unlock(&f->sem); |
1da177e4 LT |
700 | |
701 | jffs2_complete_reservation(c); | |
aa98d7cf | 702 | |
2a7dba39 | 703 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
704 | if (ret) |
705 | goto fail; | |
706 | ||
cfc8dc6f | 707 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
708 | if (ret) |
709 | goto fail; | |
aa98d7cf | 710 | |
9fe4854c DW |
711 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
712 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
713 | if (ret) |
714 | goto fail; | |
1da177e4 LT |
715 | |
716 | rd = jffs2_alloc_raw_dirent(); | |
717 | if (!rd) { | |
718 | /* Argh. Now we treat it like a normal delete */ | |
719 | jffs2_complete_reservation(c); | |
f324e4cb DW |
720 | ret = -ENOMEM; |
721 | goto fail; | |
1da177e4 LT |
722 | } |
723 | ||
724 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 725 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
726 | |
727 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
728 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
729 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
730 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
731 | ||
732 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
733 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
734 | rd->ino = cpu_to_je32(inode->i_ino); | |
735 | rd->mctime = cpu_to_je32(get_seconds()); | |
736 | rd->nsize = namelen; | |
737 | ||
738 | /* XXX: This is ugly. */ | |
739 | rd->type = (mode & S_IFMT) >> 12; | |
740 | ||
741 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
742 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
743 | ||
9fe4854c | 744 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 745 | |
1da177e4 | 746 | if (IS_ERR(fd)) { |
182ec4ee | 747 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
748 | as if it were the final unlink() */ |
749 | jffs2_complete_reservation(c); | |
750 | jffs2_free_raw_dirent(rd); | |
ced22070 | 751 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
752 | ret = PTR_ERR(fd); |
753 | goto fail; | |
1da177e4 LT |
754 | } |
755 | ||
756 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
757 | ||
758 | jffs2_free_raw_dirent(rd); | |
759 | ||
760 | /* Link the fd into the inode's list, obsoleting an old | |
761 | one if necessary. */ | |
762 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
763 | ||
ced22070 | 764 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
765 | jffs2_complete_reservation(c); |
766 | ||
767 | d_instantiate(dentry, inode); | |
e72e6497 | 768 | unlock_new_inode(inode); |
1da177e4 | 769 | return 0; |
f324e4cb DW |
770 | |
771 | fail: | |
41cce647 | 772 | iget_failed(inode); |
f324e4cb | 773 | return ret; |
1da177e4 LT |
774 | } |
775 | ||
776 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 777 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
778 | { |
779 | int ret; | |
780 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
781 | struct jffs2_inode_info *victim_f = NULL; | |
782 | uint8_t type; | |
3a69e0cd | 783 | uint32_t now; |
1da177e4 | 784 | |
182ec4ee | 785 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
786 | * file over a directory and vice versa, but if it's a directory, |
787 | * the VFS can't check whether the victim is empty. The filesystem | |
788 | * needs to do that for itself. | |
789 | */ | |
790 | if (new_dentry->d_inode) { | |
791 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
792 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
793 | struct jffs2_full_dirent *fd; | |
794 | ||
ced22070 | 795 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
796 | for (fd = victim_f->dents; fd; fd = fd->next) { |
797 | if (fd->ino) { | |
ced22070 | 798 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
799 | return -ENOTEMPTY; |
800 | } | |
801 | } | |
ced22070 | 802 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
803 | } |
804 | } | |
805 | ||
806 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 807 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
808 | then getting -ENOSPC, is quite bad :) |
809 | */ | |
810 | ||
811 | /* Make a hard link */ | |
182ec4ee | 812 | |
1da177e4 LT |
813 | /* XXX: This is ugly */ |
814 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
815 | if (!type) type = DT_REG; | |
816 | ||
3a69e0cd | 817 | now = get_seconds(); |
182ec4ee | 818 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 819 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 820 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
821 | |
822 | if (ret) | |
823 | return ret; | |
824 | ||
825 | if (victim_f) { | |
826 | /* There was a victim. Kill it off nicely */ | |
22ba747f AV |
827 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
828 | clear_nlink(new_dentry->d_inode); | |
829 | else | |
830 | drop_nlink(new_dentry->d_inode); | |
1da177e4 LT |
831 | /* Don't oops if the victim was a dirent pointing to an |
832 | inode which didn't exist. */ | |
833 | if (victim_f->inocache) { | |
ced22070 | 834 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
835 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
836 | victim_f->inocache->pino_nlink = 0; | |
837 | else | |
838 | victim_f->inocache->pino_nlink--; | |
ced22070 | 839 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
840 | } |
841 | } | |
842 | ||
182ec4ee | 843 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
844 | increase i_nlink on its new parent */ |
845 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 846 | inc_nlink(new_dir_i); |
1da177e4 LT |
847 | |
848 | /* Unlink the original */ | |
182ec4ee | 849 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 850 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
851 | |
852 | /* We don't touch inode->i_nlink */ | |
853 | ||
854 | if (ret) { | |
855 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
856 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 857 | mutex_lock(&f->sem); |
d8c76e6f | 858 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
859 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
860 | f->inocache->pino_nlink++; | |
ced22070 | 861 | mutex_unlock(&f->sem); |
1da177e4 LT |
862 | |
863 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
864 | /* Might as well let the VFS know */ | |
865 | d_instantiate(new_dentry, old_dentry->d_inode); | |
7de9c6ee | 866 | ihold(old_dentry->d_inode); |
3a69e0cd | 867 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
868 | return ret; |
869 | } | |
870 | ||
871 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 872 | drop_nlink(old_dir_i); |
1da177e4 | 873 | |
3a69e0cd AB |
874 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
875 | ||
1da177e4 LT |
876 | return 0; |
877 | } | |
878 |