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 | ||
1da177e4 LT |
25 | static int jffs2_readdir (struct file *, void *, filldir_t); |
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, | |
43 | .readdir = 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 | ||
117 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
118 | { | |
119 | struct jffs2_inode_info *f; | |
ec2e203c | 120 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
121 | struct jffs2_full_dirent *fd; |
122 | unsigned long offset, curofs; | |
123 | ||
9c261b33 JP |
124 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", |
125 | filp->f_path.dentry->d_inode->i_ino); | |
1da177e4 LT |
126 | |
127 | f = JFFS2_INODE_INFO(inode); | |
1da177e4 LT |
128 | |
129 | offset = filp->f_pos; | |
130 | ||
131 | if (offset == 0) { | |
9c261b33 | 132 | jffs2_dbg(1, "Dirent 0: \".\", ino #%lu\n", inode->i_ino); |
1da177e4 LT |
133 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
134 | goto out; | |
135 | offset++; | |
136 | } | |
137 | if (offset == 1) { | |
ec2e203c | 138 | unsigned long pino = parent_ino(filp->f_path.dentry); |
9c261b33 | 139 | jffs2_dbg(1, "Dirent 1: \"..\", ino #%lu\n", pino); |
1da177e4 LT |
140 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) |
141 | goto out; | |
142 | offset++; | |
143 | } | |
144 | ||
145 | curofs=1; | |
ced22070 | 146 | mutex_lock(&f->sem); |
1da177e4 LT |
147 | for (fd = f->dents; fd; fd = fd->next) { |
148 | ||
149 | curofs++; | |
150 | /* First loop: curofs = 2; offset = 2 */ | |
151 | if (curofs < offset) { | |
9c261b33 JP |
152 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
153 | fd->name, fd->ino, fd->type, curofs, offset); | |
1da177e4 LT |
154 | continue; |
155 | } | |
156 | if (!fd->ino) { | |
9c261b33 JP |
157 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
158 | fd->name); | |
1da177e4 LT |
159 | offset++; |
160 | continue; | |
161 | } | |
9c261b33 JP |
162 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
163 | offset, fd->name, fd->ino, fd->type); | |
1da177e4 LT |
164 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) |
165 | break; | |
166 | offset++; | |
167 | } | |
ced22070 | 168 | mutex_unlock(&f->sem); |
1da177e4 LT |
169 | out: |
170 | filp->f_pos = offset; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /***********************************************************************/ | |
175 | ||
176 | ||
4acdaf27 | 177 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
ebfc3b49 | 178 | umode_t mode, bool excl) |
1da177e4 LT |
179 | { |
180 | struct jffs2_raw_inode *ri; | |
181 | struct jffs2_inode_info *f, *dir_f; | |
182 | struct jffs2_sb_info *c; | |
183 | struct inode *inode; | |
184 | int ret; | |
185 | ||
186 | ri = jffs2_alloc_raw_inode(); | |
187 | if (!ri) | |
188 | return -ENOMEM; | |
182ec4ee | 189 | |
1da177e4 LT |
190 | c = JFFS2_SB_INFO(dir_i->i_sb); |
191 | ||
9c261b33 | 192 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 193 | |
cfc8dc6f | 194 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
195 | |
196 | if (IS_ERR(inode)) { | |
9c261b33 | 197 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
198 | jffs2_free_raw_inode(ri); |
199 | return PTR_ERR(inode); | |
200 | } | |
201 | ||
202 | inode->i_op = &jffs2_file_inode_operations; | |
203 | inode->i_fop = &jffs2_file_operations; | |
204 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
205 | inode->i_mapping->nrpages = 0; | |
206 | ||
207 | f = JFFS2_INODE_INFO(inode); | |
208 | dir_f = JFFS2_INODE_INFO(dir_i); | |
209 | ||
590fe34c DW |
210 | /* jffs2_do_create() will want to lock it, _after_ reserving |
211 | space and taking c-alloc_sem. If we keep it locked here, | |
212 | lockdep gets unhappy (although it's a false positive; | |
213 | nothing else will be looking at this inode yet so there's | |
214 | no chance of AB-BA deadlock involving its f->sem). */ | |
215 | mutex_unlock(&f->sem); | |
216 | ||
2a7dba39 | 217 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
218 | if (ret) |
219 | goto fail; | |
1da177e4 LT |
220 | |
221 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
222 | ||
223 | jffs2_free_raw_inode(ri); | |
1da177e4 | 224 | |
9c261b33 JP |
225 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
226 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
227 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 DW |
228 | |
229 | d_instantiate(dentry, inode); | |
230 | unlock_new_inode(inode); | |
1da177e4 | 231 | return 0; |
aa98d7cf KK |
232 | |
233 | fail: | |
41cce647 | 234 | iget_failed(inode); |
aa98d7cf KK |
235 | jffs2_free_raw_inode(ri); |
236 | return ret; | |
1da177e4 LT |
237 | } |
238 | ||
239 | /***********************************************************************/ | |
240 | ||
241 | ||
242 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
243 | { | |
244 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
245 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
246 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
247 | int ret; | |
3a69e0cd | 248 | uint32_t now = get_seconds(); |
1da177e4 | 249 | |
182ec4ee | 250 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 251 | dentry->d_name.len, dead_f, now); |
1da177e4 | 252 | if (dead_f->inocache) |
bfe86848 | 253 | set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); |
3a69e0cd AB |
254 | if (!ret) |
255 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
256 | return ret; |
257 | } | |
258 | /***********************************************************************/ | |
259 | ||
260 | ||
261 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
262 | { | |
263 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
264 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
265 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
266 | int ret; | |
267 | uint8_t type; | |
3a69e0cd | 268 | uint32_t now; |
1da177e4 LT |
269 | |
270 | /* Don't let people make hard links to bad inodes. */ | |
271 | if (!f->inocache) | |
272 | return -EIO; | |
273 | ||
274 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
275 | return -EPERM; | |
276 | ||
277 | /* XXX: This is ugly */ | |
278 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
279 | if (!type) type = DT_REG; | |
280 | ||
3a69e0cd AB |
281 | now = get_seconds(); |
282 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
283 | |
284 | if (!ret) { | |
ced22070 | 285 | mutex_lock(&f->sem); |
bfe86848 | 286 | set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); |
ced22070 | 287 | mutex_unlock(&f->sem); |
1da177e4 | 288 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 289 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 290 | ihold(old_dentry->d_inode); |
1da177e4 LT |
291 | } |
292 | return ret; | |
293 | } | |
294 | ||
295 | /***********************************************************************/ | |
296 | ||
297 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
298 | { | |
299 | struct jffs2_inode_info *f, *dir_f; | |
300 | struct jffs2_sb_info *c; | |
301 | struct inode *inode; | |
302 | struct jffs2_raw_inode *ri; | |
303 | struct jffs2_raw_dirent *rd; | |
304 | struct jffs2_full_dnode *fn; | |
305 | struct jffs2_full_dirent *fd; | |
306 | int namelen; | |
9fe4854c | 307 | uint32_t alloclen; |
32f1a95d | 308 | int ret, targetlen = strlen(target); |
1da177e4 LT |
309 | |
310 | /* FIXME: If you care. We'd need to use frags for the target | |
311 | if it grows much more than this */ | |
32f1a95d | 312 | if (targetlen > 254) |
bde86fec | 313 | return -ENAMETOOLONG; |
1da177e4 LT |
314 | |
315 | ri = jffs2_alloc_raw_inode(); | |
316 | ||
317 | if (!ri) | |
318 | return -ENOMEM; | |
182ec4ee | 319 | |
1da177e4 | 320 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
321 | |
322 | /* Try to reserve enough space for both node and dirent. | |
323 | * Just the node will do for now, though | |
1da177e4 LT |
324 | */ |
325 | namelen = dentry->d_name.len; | |
9fe4854c DW |
326 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
327 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
328 | |
329 | if (ret) { | |
330 | jffs2_free_raw_inode(ri); | |
331 | return ret; | |
332 | } | |
333 | ||
cfc8dc6f | 334 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
335 | |
336 | if (IS_ERR(inode)) { | |
337 | jffs2_free_raw_inode(ri); | |
338 | jffs2_complete_reservation(c); | |
339 | return PTR_ERR(inode); | |
340 | } | |
341 | ||
342 | inode->i_op = &jffs2_symlink_inode_operations; | |
343 | ||
344 | f = JFFS2_INODE_INFO(inode); | |
345 | ||
32f1a95d | 346 | inode->i_size = targetlen; |
1da177e4 LT |
347 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
348 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
349 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
350 | ||
351 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 352 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 353 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 354 | |
9fe4854c | 355 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
356 | |
357 | jffs2_free_raw_inode(ri); | |
358 | ||
359 | if (IS_ERR(fn)) { | |
360 | /* Eeek. Wave bye bye */ | |
ced22070 | 361 | mutex_unlock(&f->sem); |
1da177e4 | 362 | jffs2_complete_reservation(c); |
f324e4cb DW |
363 | ret = PTR_ERR(fn); |
364 | goto fail; | |
1da177e4 | 365 | } |
32f1a95d | 366 | |
2b79adcc | 367 | /* We use f->target field to store the target path. */ |
04aadf36 | 368 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 369 | if (!f->target) { |
da320f05 | 370 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 371 | mutex_unlock(&f->sem); |
32f1a95d | 372 | jffs2_complete_reservation(c); |
f324e4cb DW |
373 | ret = -ENOMEM; |
374 | goto fail; | |
32f1a95d AB |
375 | } |
376 | ||
9c261b33 JP |
377 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
378 | __func__, (char *)f->target); | |
32f1a95d | 379 | |
182ec4ee | 380 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
381 | obsoleted by the first data write |
382 | */ | |
383 | f->metadata = fn; | |
ced22070 | 384 | mutex_unlock(&f->sem); |
1da177e4 LT |
385 | |
386 | jffs2_complete_reservation(c); | |
aa98d7cf | 387 | |
2a7dba39 | 388 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
389 | if (ret) |
390 | goto fail; | |
391 | ||
cfc8dc6f | 392 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
393 | if (ret) |
394 | goto fail; | |
aa98d7cf | 395 | |
9fe4854c DW |
396 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
397 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
398 | if (ret) |
399 | goto fail; | |
1da177e4 LT |
400 | |
401 | rd = jffs2_alloc_raw_dirent(); | |
402 | if (!rd) { | |
403 | /* Argh. Now we treat it like a normal delete */ | |
404 | jffs2_complete_reservation(c); | |
f324e4cb DW |
405 | ret = -ENOMEM; |
406 | goto fail; | |
1da177e4 LT |
407 | } |
408 | ||
409 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 410 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
411 | |
412 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
413 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
414 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
415 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
416 | ||
417 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
418 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
419 | rd->ino = cpu_to_je32(inode->i_ino); | |
420 | rd->mctime = cpu_to_je32(get_seconds()); | |
421 | rd->nsize = namelen; | |
422 | rd->type = DT_LNK; | |
423 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
424 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
425 | ||
9fe4854c | 426 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
427 | |
428 | if (IS_ERR(fd)) { | |
182ec4ee | 429 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
430 | as if it were the final unlink() */ |
431 | jffs2_complete_reservation(c); | |
432 | jffs2_free_raw_dirent(rd); | |
ced22070 | 433 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
434 | ret = PTR_ERR(fd); |
435 | goto fail; | |
1da177e4 LT |
436 | } |
437 | ||
438 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
439 | ||
440 | jffs2_free_raw_dirent(rd); | |
441 | ||
442 | /* Link the fd into the inode's list, obsoleting an old | |
443 | one if necessary. */ | |
444 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
445 | ||
ced22070 | 446 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
447 | jffs2_complete_reservation(c); |
448 | ||
449 | d_instantiate(dentry, inode); | |
e72e6497 | 450 | unlock_new_inode(inode); |
1da177e4 | 451 | return 0; |
f324e4cb DW |
452 | |
453 | fail: | |
41cce647 | 454 | iget_failed(inode); |
f324e4cb | 455 | return ret; |
1da177e4 LT |
456 | } |
457 | ||
458 | ||
18bb1db3 | 459 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
460 | { |
461 | struct jffs2_inode_info *f, *dir_f; | |
462 | struct jffs2_sb_info *c; | |
463 | struct inode *inode; | |
464 | struct jffs2_raw_inode *ri; | |
465 | struct jffs2_raw_dirent *rd; | |
466 | struct jffs2_full_dnode *fn; | |
467 | struct jffs2_full_dirent *fd; | |
468 | int namelen; | |
9fe4854c | 469 | uint32_t alloclen; |
1da177e4 LT |
470 | int ret; |
471 | ||
472 | mode |= S_IFDIR; | |
473 | ||
474 | ri = jffs2_alloc_raw_inode(); | |
475 | if (!ri) | |
476 | return -ENOMEM; | |
182ec4ee | 477 | |
1da177e4 LT |
478 | c = JFFS2_SB_INFO(dir_i->i_sb); |
479 | ||
182ec4ee TG |
480 | /* Try to reserve enough space for both node and dirent. |
481 | * Just the node will do for now, though | |
1da177e4 LT |
482 | */ |
483 | namelen = dentry->d_name.len; | |
9fe4854c DW |
484 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
485 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
486 | |
487 | if (ret) { | |
488 | jffs2_free_raw_inode(ri); | |
489 | return ret; | |
490 | } | |
491 | ||
cfc8dc6f | 492 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
493 | |
494 | if (IS_ERR(inode)) { | |
495 | jffs2_free_raw_inode(ri); | |
496 | jffs2_complete_reservation(c); | |
497 | return PTR_ERR(inode); | |
498 | } | |
499 | ||
500 | inode->i_op = &jffs2_dir_inode_operations; | |
501 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
502 | |
503 | f = JFFS2_INODE_INFO(inode); | |
504 | ||
27c72b04 | 505 | /* Directories get nlink 2 at start */ |
bfe86848 | 506 | set_nlink(inode, 2); |
27c72b04 DW |
507 | /* but ic->pino_nlink is the parent ino# */ |
508 | f->inocache->pino_nlink = dir_i->i_ino; | |
509 | ||
1da177e4 LT |
510 | ri->data_crc = cpu_to_je32(0); |
511 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 512 | |
9fe4854c | 513 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
514 | |
515 | jffs2_free_raw_inode(ri); | |
516 | ||
517 | if (IS_ERR(fn)) { | |
518 | /* Eeek. Wave bye bye */ | |
ced22070 | 519 | mutex_unlock(&f->sem); |
1da177e4 | 520 | jffs2_complete_reservation(c); |
f324e4cb DW |
521 | ret = PTR_ERR(fn); |
522 | goto fail; | |
1da177e4 | 523 | } |
182ec4ee | 524 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
525 | obsoleted by the first data write |
526 | */ | |
527 | f->metadata = fn; | |
ced22070 | 528 | mutex_unlock(&f->sem); |
1da177e4 LT |
529 | |
530 | jffs2_complete_reservation(c); | |
aa98d7cf | 531 | |
2a7dba39 | 532 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
533 | if (ret) |
534 | goto fail; | |
535 | ||
cfc8dc6f | 536 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
537 | if (ret) |
538 | goto fail; | |
aa98d7cf | 539 | |
9fe4854c DW |
540 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
541 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
542 | if (ret) |
543 | goto fail; | |
182ec4ee | 544 | |
1da177e4 LT |
545 | rd = jffs2_alloc_raw_dirent(); |
546 | if (!rd) { | |
547 | /* Argh. Now we treat it like a normal delete */ | |
548 | jffs2_complete_reservation(c); | |
f324e4cb DW |
549 | ret = -ENOMEM; |
550 | goto fail; | |
1da177e4 LT |
551 | } |
552 | ||
553 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 554 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
555 | |
556 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
557 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
558 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
559 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
560 | ||
561 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
562 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
563 | rd->ino = cpu_to_je32(inode->i_ino); | |
564 | rd->mctime = cpu_to_je32(get_seconds()); | |
565 | rd->nsize = namelen; | |
566 | rd->type = DT_DIR; | |
567 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
568 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
569 | ||
9fe4854c | 570 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 571 | |
1da177e4 | 572 | if (IS_ERR(fd)) { |
182ec4ee | 573 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
574 | as if it were the final unlink() */ |
575 | jffs2_complete_reservation(c); | |
576 | jffs2_free_raw_dirent(rd); | |
ced22070 | 577 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
578 | ret = PTR_ERR(fd); |
579 | goto fail; | |
1da177e4 LT |
580 | } |
581 | ||
582 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 583 | inc_nlink(dir_i); |
1da177e4 LT |
584 | |
585 | jffs2_free_raw_dirent(rd); | |
586 | ||
587 | /* Link the fd into the inode's list, obsoleting an old | |
588 | one if necessary. */ | |
589 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
590 | ||
ced22070 | 591 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
592 | jffs2_complete_reservation(c); |
593 | ||
594 | d_instantiate(dentry, inode); | |
e72e6497 | 595 | unlock_new_inode(inode); |
1da177e4 | 596 | return 0; |
f324e4cb DW |
597 | |
598 | fail: | |
41cce647 | 599 | iget_failed(inode); |
f324e4cb | 600 | return ret; |
1da177e4 LT |
601 | } |
602 | ||
603 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
604 | { | |
27c72b04 DW |
605 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
606 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
607 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
608 | struct jffs2_full_dirent *fd; | |
609 | int ret; | |
27c72b04 | 610 | uint32_t now = get_seconds(); |
1da177e4 LT |
611 | |
612 | for (fd = f->dents ; fd; fd = fd->next) { | |
613 | if (fd->ino) | |
614 | return -ENOTEMPTY; | |
615 | } | |
27c72b04 DW |
616 | |
617 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
618 | dentry->d_name.len, f, now); | |
619 | if (!ret) { | |
620 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
621 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 622 | drop_nlink(dir_i); |
27c72b04 | 623 | } |
1da177e4 LT |
624 | return ret; |
625 | } | |
626 | ||
1a67aafb | 627 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
628 | { |
629 | struct jffs2_inode_info *f, *dir_f; | |
630 | struct jffs2_sb_info *c; | |
631 | struct inode *inode; | |
632 | struct jffs2_raw_inode *ri; | |
633 | struct jffs2_raw_dirent *rd; | |
634 | struct jffs2_full_dnode *fn; | |
635 | struct jffs2_full_dirent *fd; | |
636 | int namelen; | |
aef9ab47 | 637 | union jffs2_device_node dev; |
1da177e4 | 638 | int devlen = 0; |
9fe4854c | 639 | uint32_t alloclen; |
1da177e4 LT |
640 | int ret; |
641 | ||
aef9ab47 | 642 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
643 | return -EINVAL; |
644 | ||
645 | ri = jffs2_alloc_raw_inode(); | |
646 | if (!ri) | |
647 | return -ENOMEM; | |
182ec4ee | 648 | |
1da177e4 | 649 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 650 | |
aef9ab47 DW |
651 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
652 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
653 | |
654 | /* Try to reserve enough space for both node and dirent. | |
655 | * Just the node will do for now, though | |
1da177e4 LT |
656 | */ |
657 | namelen = dentry->d_name.len; | |
9fe4854c | 658 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 659 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
660 | |
661 | if (ret) { | |
662 | jffs2_free_raw_inode(ri); | |
663 | return ret; | |
664 | } | |
665 | ||
cfc8dc6f | 666 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
667 | |
668 | if (IS_ERR(inode)) { | |
669 | jffs2_free_raw_inode(ri); | |
670 | jffs2_complete_reservation(c); | |
671 | return PTR_ERR(inode); | |
672 | } | |
673 | inode->i_op = &jffs2_file_inode_operations; | |
674 | init_special_inode(inode, inode->i_mode, rdev); | |
675 | ||
676 | f = JFFS2_INODE_INFO(inode); | |
677 | ||
678 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
679 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
680 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
681 | ||
682 | ri->compr = JFFS2_COMPR_NONE; | |
683 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
684 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 685 | |
9fe4854c | 686 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
687 | |
688 | jffs2_free_raw_inode(ri); | |
689 | ||
690 | if (IS_ERR(fn)) { | |
691 | /* Eeek. Wave bye bye */ | |
ced22070 | 692 | mutex_unlock(&f->sem); |
1da177e4 | 693 | jffs2_complete_reservation(c); |
f324e4cb DW |
694 | ret = PTR_ERR(fn); |
695 | goto fail; | |
1da177e4 | 696 | } |
182ec4ee | 697 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
698 | obsoleted by the first data write |
699 | */ | |
700 | f->metadata = fn; | |
ced22070 | 701 | mutex_unlock(&f->sem); |
1da177e4 LT |
702 | |
703 | jffs2_complete_reservation(c); | |
aa98d7cf | 704 | |
2a7dba39 | 705 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
706 | if (ret) |
707 | goto fail; | |
708 | ||
cfc8dc6f | 709 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
710 | if (ret) |
711 | goto fail; | |
aa98d7cf | 712 | |
9fe4854c DW |
713 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
714 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
715 | if (ret) |
716 | goto fail; | |
1da177e4 LT |
717 | |
718 | rd = jffs2_alloc_raw_dirent(); | |
719 | if (!rd) { | |
720 | /* Argh. Now we treat it like a normal delete */ | |
721 | jffs2_complete_reservation(c); | |
f324e4cb DW |
722 | ret = -ENOMEM; |
723 | goto fail; | |
1da177e4 LT |
724 | } |
725 | ||
726 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 727 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
728 | |
729 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
730 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
731 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
732 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
733 | ||
734 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
735 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
736 | rd->ino = cpu_to_je32(inode->i_ino); | |
737 | rd->mctime = cpu_to_je32(get_seconds()); | |
738 | rd->nsize = namelen; | |
739 | ||
740 | /* XXX: This is ugly. */ | |
741 | rd->type = (mode & S_IFMT) >> 12; | |
742 | ||
743 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
744 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
745 | ||
9fe4854c | 746 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 747 | |
1da177e4 | 748 | if (IS_ERR(fd)) { |
182ec4ee | 749 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
750 | as if it were the final unlink() */ |
751 | jffs2_complete_reservation(c); | |
752 | jffs2_free_raw_dirent(rd); | |
ced22070 | 753 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
754 | ret = PTR_ERR(fd); |
755 | goto fail; | |
1da177e4 LT |
756 | } |
757 | ||
758 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
759 | ||
760 | jffs2_free_raw_dirent(rd); | |
761 | ||
762 | /* Link the fd into the inode's list, obsoleting an old | |
763 | one if necessary. */ | |
764 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
765 | ||
ced22070 | 766 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
767 | jffs2_complete_reservation(c); |
768 | ||
769 | d_instantiate(dentry, inode); | |
e72e6497 | 770 | unlock_new_inode(inode); |
1da177e4 | 771 | return 0; |
f324e4cb DW |
772 | |
773 | fail: | |
41cce647 | 774 | iget_failed(inode); |
f324e4cb | 775 | return ret; |
1da177e4 LT |
776 | } |
777 | ||
778 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 779 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
780 | { |
781 | int ret; | |
782 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
783 | struct jffs2_inode_info *victim_f = NULL; | |
784 | uint8_t type; | |
3a69e0cd | 785 | uint32_t now; |
1da177e4 | 786 | |
182ec4ee | 787 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
788 | * file over a directory and vice versa, but if it's a directory, |
789 | * the VFS can't check whether the victim is empty. The filesystem | |
790 | * needs to do that for itself. | |
791 | */ | |
792 | if (new_dentry->d_inode) { | |
793 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
794 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
795 | struct jffs2_full_dirent *fd; | |
796 | ||
ced22070 | 797 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
798 | for (fd = victim_f->dents; fd; fd = fd->next) { |
799 | if (fd->ino) { | |
ced22070 | 800 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
801 | return -ENOTEMPTY; |
802 | } | |
803 | } | |
ced22070 | 804 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
805 | } |
806 | } | |
807 | ||
808 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 809 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
810 | then getting -ENOSPC, is quite bad :) |
811 | */ | |
812 | ||
813 | /* Make a hard link */ | |
182ec4ee | 814 | |
1da177e4 LT |
815 | /* XXX: This is ugly */ |
816 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
817 | if (!type) type = DT_REG; | |
818 | ||
3a69e0cd | 819 | now = get_seconds(); |
182ec4ee | 820 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 821 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 822 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
823 | |
824 | if (ret) | |
825 | return ret; | |
826 | ||
827 | if (victim_f) { | |
828 | /* There was a victim. Kill it off nicely */ | |
22ba747f AV |
829 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
830 | clear_nlink(new_dentry->d_inode); | |
831 | else | |
832 | drop_nlink(new_dentry->d_inode); | |
1da177e4 LT |
833 | /* Don't oops if the victim was a dirent pointing to an |
834 | inode which didn't exist. */ | |
835 | if (victim_f->inocache) { | |
ced22070 | 836 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
837 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
838 | victim_f->inocache->pino_nlink = 0; | |
839 | else | |
840 | victim_f->inocache->pino_nlink--; | |
ced22070 | 841 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
842 | } |
843 | } | |
844 | ||
182ec4ee | 845 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
846 | increase i_nlink on its new parent */ |
847 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 848 | inc_nlink(new_dir_i); |
1da177e4 LT |
849 | |
850 | /* Unlink the original */ | |
182ec4ee | 851 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 852 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
853 | |
854 | /* We don't touch inode->i_nlink */ | |
855 | ||
856 | if (ret) { | |
857 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
858 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 859 | mutex_lock(&f->sem); |
d8c76e6f | 860 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
861 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
862 | f->inocache->pino_nlink++; | |
ced22070 | 863 | mutex_unlock(&f->sem); |
1da177e4 | 864 | |
da320f05 JP |
865 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
866 | __func__, ret); | |
1da177e4 LT |
867 | /* Might as well let the VFS know */ |
868 | d_instantiate(new_dentry, old_dentry->d_inode); | |
7de9c6ee | 869 | ihold(old_dentry->d_inode); |
3a69e0cd | 870 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
871 | return ret; |
872 | } | |
873 | ||
874 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 875 | drop_nlink(old_dir_i); |
1da177e4 | 876 | |
3a69e0cd AB |
877 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
878 | ||
1da177e4 LT |
879 | return 0; |
880 | } | |
881 |