]>
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 | ||
25 | static int jffs2_create (struct inode *,struct dentry *,int, | |
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 *); | |
32 | static int jffs2_mkdir (struct inode *,struct dentry *,int); | |
33 | static int jffs2_rmdir (struct inode *,struct dentry *); | |
265489f0 | 34 | static int jffs2_mknod (struct inode *,struct dentry *,int,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, | |
18f4c644 | 59 | .check_acl = jffs2_check_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 | ||
82 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
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 DH |
104 | inode = jffs2_iget(dir_i->i_sb, ino); |
105 | if (IS_ERR(inode)) { | |
1da177e4 | 106 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
5451f79f | 107 | return ERR_CAST(inode); |
1da177e4 LT |
108 | } |
109 | } | |
110 | ||
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 | ||
ec2e203c | 124 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
125 | |
126 | f = JFFS2_INODE_INFO(inode); | |
1da177e4 LT |
127 | |
128 | offset = filp->f_pos; | |
129 | ||
130 | if (offset == 0) { | |
131 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
132 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
133 | goto out; | |
134 | offset++; | |
135 | } | |
136 | if (offset == 1) { | |
ec2e203c | 137 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
138 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
139 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
140 | goto out; | |
141 | offset++; | |
142 | } | |
143 | ||
144 | curofs=1; | |
ced22070 | 145 | mutex_lock(&f->sem); |
1da177e4 LT |
146 | for (fd = f->dents; fd; fd = fd->next) { |
147 | ||
148 | curofs++; | |
149 | /* First loop: curofs = 2; offset = 2 */ | |
150 | if (curofs < offset) { | |
182ec4ee | 151 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
152 | fd->name, fd->ino, fd->type, curofs, offset)); |
153 | continue; | |
154 | } | |
155 | if (!fd->ino) { | |
156 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
157 | offset++; | |
158 | continue; | |
159 | } | |
160 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
161 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
162 | break; | |
163 | offset++; | |
164 | } | |
ced22070 | 165 | mutex_unlock(&f->sem); |
1da177e4 LT |
166 | out: |
167 | filp->f_pos = offset; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /***********************************************************************/ | |
172 | ||
173 | ||
174 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
175 | struct nameidata *nd) | |
176 | { | |
177 | struct jffs2_raw_inode *ri; | |
178 | struct jffs2_inode_info *f, *dir_f; | |
179 | struct jffs2_sb_info *c; | |
180 | struct inode *inode; | |
181 | int ret; | |
182 | ||
183 | ri = jffs2_alloc_raw_inode(); | |
184 | if (!ri) | |
185 | return -ENOMEM; | |
182ec4ee | 186 | |
1da177e4 LT |
187 | c = JFFS2_SB_INFO(dir_i->i_sb); |
188 | ||
189 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
190 | ||
cfc8dc6f | 191 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
192 | |
193 | if (IS_ERR(inode)) { | |
194 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
195 | jffs2_free_raw_inode(ri); | |
196 | return PTR_ERR(inode); | |
197 | } | |
198 | ||
199 | inode->i_op = &jffs2_file_inode_operations; | |
200 | inode->i_fop = &jffs2_file_operations; | |
201 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
202 | inode->i_mapping->nrpages = 0; | |
203 | ||
204 | f = JFFS2_INODE_INFO(inode); | |
205 | dir_f = JFFS2_INODE_INFO(dir_i); | |
206 | ||
590fe34c DW |
207 | /* jffs2_do_create() will want to lock it, _after_ reserving |
208 | space and taking c-alloc_sem. If we keep it locked here, | |
209 | lockdep gets unhappy (although it's a false positive; | |
210 | nothing else will be looking at this inode yet so there's | |
211 | no chance of AB-BA deadlock involving its f->sem). */ | |
212 | mutex_unlock(&f->sem); | |
213 | ||
2a7dba39 | 214 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
215 | if (ret) |
216 | goto fail; | |
1da177e4 LT |
217 | |
218 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
219 | ||
220 | jffs2_free_raw_inode(ri); | |
1da177e4 LT |
221 | |
222 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
27c72b04 DW |
223 | inode->i_ino, inode->i_mode, inode->i_nlink, |
224 | f->inocache->pino_nlink, inode->i_mapping->nrpages)); | |
e72e6497 DW |
225 | |
226 | d_instantiate(dentry, inode); | |
227 | unlock_new_inode(inode); | |
1da177e4 | 228 | return 0; |
aa98d7cf KK |
229 | |
230 | fail: | |
41cce647 | 231 | iget_failed(inode); |
aa98d7cf KK |
232 | jffs2_free_raw_inode(ri); |
233 | return ret; | |
1da177e4 LT |
234 | } |
235 | ||
236 | /***********************************************************************/ | |
237 | ||
238 | ||
239 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
240 | { | |
241 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
242 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
243 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
244 | int ret; | |
3a69e0cd | 245 | uint32_t now = get_seconds(); |
1da177e4 | 246 | |
182ec4ee | 247 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 248 | dentry->d_name.len, dead_f, now); |
1da177e4 | 249 | if (dead_f->inocache) |
27c72b04 | 250 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
3a69e0cd AB |
251 | if (!ret) |
252 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
253 | return ret; |
254 | } | |
255 | /***********************************************************************/ | |
256 | ||
257 | ||
258 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
259 | { | |
260 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
261 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
262 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
263 | int ret; | |
264 | uint8_t type; | |
3a69e0cd | 265 | uint32_t now; |
1da177e4 LT |
266 | |
267 | /* Don't let people make hard links to bad inodes. */ | |
268 | if (!f->inocache) | |
269 | return -EIO; | |
270 | ||
271 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
272 | return -EPERM; | |
273 | ||
274 | /* XXX: This is ugly */ | |
275 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
276 | if (!type) type = DT_REG; | |
277 | ||
3a69e0cd AB |
278 | now = get_seconds(); |
279 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
280 | |
281 | if (!ret) { | |
ced22070 | 282 | mutex_lock(&f->sem); |
27c72b04 | 283 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
ced22070 | 284 | mutex_unlock(&f->sem); |
1da177e4 | 285 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 286 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 287 | ihold(old_dentry->d_inode); |
1da177e4 LT |
288 | } |
289 | return ret; | |
290 | } | |
291 | ||
292 | /***********************************************************************/ | |
293 | ||
294 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
295 | { | |
296 | struct jffs2_inode_info *f, *dir_f; | |
297 | struct jffs2_sb_info *c; | |
298 | struct inode *inode; | |
299 | struct jffs2_raw_inode *ri; | |
300 | struct jffs2_raw_dirent *rd; | |
301 | struct jffs2_full_dnode *fn; | |
302 | struct jffs2_full_dirent *fd; | |
303 | int namelen; | |
9fe4854c | 304 | uint32_t alloclen; |
32f1a95d | 305 | int ret, targetlen = strlen(target); |
1da177e4 LT |
306 | |
307 | /* FIXME: If you care. We'd need to use frags for the target | |
308 | if it grows much more than this */ | |
32f1a95d | 309 | if (targetlen > 254) |
bde86fec | 310 | return -ENAMETOOLONG; |
1da177e4 LT |
311 | |
312 | ri = jffs2_alloc_raw_inode(); | |
313 | ||
314 | if (!ri) | |
315 | return -ENOMEM; | |
182ec4ee | 316 | |
1da177e4 | 317 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
318 | |
319 | /* Try to reserve enough space for both node and dirent. | |
320 | * Just the node will do for now, though | |
1da177e4 LT |
321 | */ |
322 | namelen = dentry->d_name.len; | |
9fe4854c DW |
323 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
324 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
325 | |
326 | if (ret) { | |
327 | jffs2_free_raw_inode(ri); | |
328 | return ret; | |
329 | } | |
330 | ||
cfc8dc6f | 331 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
332 | |
333 | if (IS_ERR(inode)) { | |
334 | jffs2_free_raw_inode(ri); | |
335 | jffs2_complete_reservation(c); | |
336 | return PTR_ERR(inode); | |
337 | } | |
338 | ||
339 | inode->i_op = &jffs2_symlink_inode_operations; | |
340 | ||
341 | f = JFFS2_INODE_INFO(inode); | |
342 | ||
32f1a95d | 343 | inode->i_size = targetlen; |
1da177e4 LT |
344 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
345 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
346 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
347 | ||
348 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 349 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 350 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 351 | |
9fe4854c | 352 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
353 | |
354 | jffs2_free_raw_inode(ri); | |
355 | ||
356 | if (IS_ERR(fn)) { | |
357 | /* Eeek. Wave bye bye */ | |
ced22070 | 358 | mutex_unlock(&f->sem); |
1da177e4 | 359 | jffs2_complete_reservation(c); |
f324e4cb DW |
360 | ret = PTR_ERR(fn); |
361 | goto fail; | |
1da177e4 | 362 | } |
32f1a95d | 363 | |
2b79adcc | 364 | /* We use f->target field to store the target path. */ |
04aadf36 | 365 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 366 | if (!f->target) { |
32f1a95d | 367 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 368 | mutex_unlock(&f->sem); |
32f1a95d | 369 | jffs2_complete_reservation(c); |
f324e4cb DW |
370 | ret = -ENOMEM; |
371 | goto fail; | |
32f1a95d AB |
372 | } |
373 | ||
2b79adcc | 374 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); |
32f1a95d | 375 | |
182ec4ee | 376 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
377 | obsoleted by the first data write |
378 | */ | |
379 | f->metadata = fn; | |
ced22070 | 380 | mutex_unlock(&f->sem); |
1da177e4 LT |
381 | |
382 | jffs2_complete_reservation(c); | |
aa98d7cf | 383 | |
2a7dba39 | 384 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
385 | if (ret) |
386 | goto fail; | |
387 | ||
cfc8dc6f | 388 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
389 | if (ret) |
390 | goto fail; | |
aa98d7cf | 391 | |
9fe4854c DW |
392 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
393 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
394 | if (ret) |
395 | goto fail; | |
1da177e4 LT |
396 | |
397 | rd = jffs2_alloc_raw_dirent(); | |
398 | if (!rd) { | |
399 | /* Argh. Now we treat it like a normal delete */ | |
400 | jffs2_complete_reservation(c); | |
f324e4cb DW |
401 | ret = -ENOMEM; |
402 | goto fail; | |
1da177e4 LT |
403 | } |
404 | ||
405 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 406 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
407 | |
408 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
409 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
410 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
411 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
412 | ||
413 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
414 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
415 | rd->ino = cpu_to_je32(inode->i_ino); | |
416 | rd->mctime = cpu_to_je32(get_seconds()); | |
417 | rd->nsize = namelen; | |
418 | rd->type = DT_LNK; | |
419 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
420 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
421 | ||
9fe4854c | 422 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
423 | |
424 | if (IS_ERR(fd)) { | |
182ec4ee | 425 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
426 | as if it were the final unlink() */ |
427 | jffs2_complete_reservation(c); | |
428 | jffs2_free_raw_dirent(rd); | |
ced22070 | 429 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
430 | ret = PTR_ERR(fd); |
431 | goto fail; | |
1da177e4 LT |
432 | } |
433 | ||
434 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
435 | ||
436 | jffs2_free_raw_dirent(rd); | |
437 | ||
438 | /* Link the fd into the inode's list, obsoleting an old | |
439 | one if necessary. */ | |
440 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
441 | ||
ced22070 | 442 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
443 | jffs2_complete_reservation(c); |
444 | ||
445 | d_instantiate(dentry, inode); | |
e72e6497 | 446 | unlock_new_inode(inode); |
1da177e4 | 447 | return 0; |
f324e4cb DW |
448 | |
449 | fail: | |
41cce647 | 450 | iget_failed(inode); |
f324e4cb | 451 | return ret; |
1da177e4 LT |
452 | } |
453 | ||
454 | ||
455 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
456 | { | |
457 | struct jffs2_inode_info *f, *dir_f; | |
458 | struct jffs2_sb_info *c; | |
459 | struct inode *inode; | |
460 | struct jffs2_raw_inode *ri; | |
461 | struct jffs2_raw_dirent *rd; | |
462 | struct jffs2_full_dnode *fn; | |
463 | struct jffs2_full_dirent *fd; | |
464 | int namelen; | |
9fe4854c | 465 | uint32_t alloclen; |
1da177e4 LT |
466 | int ret; |
467 | ||
468 | mode |= S_IFDIR; | |
469 | ||
470 | ri = jffs2_alloc_raw_inode(); | |
471 | if (!ri) | |
472 | return -ENOMEM; | |
182ec4ee | 473 | |
1da177e4 LT |
474 | c = JFFS2_SB_INFO(dir_i->i_sb); |
475 | ||
182ec4ee TG |
476 | /* Try to reserve enough space for both node and dirent. |
477 | * Just the node will do for now, though | |
1da177e4 LT |
478 | */ |
479 | namelen = dentry->d_name.len; | |
9fe4854c DW |
480 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
481 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
482 | |
483 | if (ret) { | |
484 | jffs2_free_raw_inode(ri); | |
485 | return ret; | |
486 | } | |
487 | ||
cfc8dc6f | 488 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
489 | |
490 | if (IS_ERR(inode)) { | |
491 | jffs2_free_raw_inode(ri); | |
492 | jffs2_complete_reservation(c); | |
493 | return PTR_ERR(inode); | |
494 | } | |
495 | ||
496 | inode->i_op = &jffs2_dir_inode_operations; | |
497 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
498 | |
499 | f = JFFS2_INODE_INFO(inode); | |
500 | ||
27c72b04 DW |
501 | /* Directories get nlink 2 at start */ |
502 | inode->i_nlink = 2; | |
503 | /* but ic->pino_nlink is the parent ino# */ | |
504 | f->inocache->pino_nlink = dir_i->i_ino; | |
505 | ||
1da177e4 LT |
506 | ri->data_crc = cpu_to_je32(0); |
507 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 508 | |
9fe4854c | 509 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
510 | |
511 | jffs2_free_raw_inode(ri); | |
512 | ||
513 | if (IS_ERR(fn)) { | |
514 | /* Eeek. Wave bye bye */ | |
ced22070 | 515 | mutex_unlock(&f->sem); |
1da177e4 | 516 | jffs2_complete_reservation(c); |
f324e4cb DW |
517 | ret = PTR_ERR(fn); |
518 | goto fail; | |
1da177e4 | 519 | } |
182ec4ee | 520 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
521 | obsoleted by the first data write |
522 | */ | |
523 | f->metadata = fn; | |
ced22070 | 524 | mutex_unlock(&f->sem); |
1da177e4 LT |
525 | |
526 | jffs2_complete_reservation(c); | |
aa98d7cf | 527 | |
2a7dba39 | 528 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
529 | if (ret) |
530 | goto fail; | |
531 | ||
cfc8dc6f | 532 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
533 | if (ret) |
534 | goto fail; | |
aa98d7cf | 535 | |
9fe4854c DW |
536 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
537 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
538 | if (ret) |
539 | goto fail; | |
182ec4ee | 540 | |
1da177e4 LT |
541 | rd = jffs2_alloc_raw_dirent(); |
542 | if (!rd) { | |
543 | /* Argh. Now we treat it like a normal delete */ | |
544 | jffs2_complete_reservation(c); | |
f324e4cb DW |
545 | ret = -ENOMEM; |
546 | goto fail; | |
1da177e4 LT |
547 | } |
548 | ||
549 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 550 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
551 | |
552 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
553 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
554 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
555 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
556 | ||
557 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
558 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
559 | rd->ino = cpu_to_je32(inode->i_ino); | |
560 | rd->mctime = cpu_to_je32(get_seconds()); | |
561 | rd->nsize = namelen; | |
562 | rd->type = DT_DIR; | |
563 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
564 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
565 | ||
9fe4854c | 566 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 567 | |
1da177e4 | 568 | if (IS_ERR(fd)) { |
182ec4ee | 569 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
570 | as if it were the final unlink() */ |
571 | jffs2_complete_reservation(c); | |
572 | jffs2_free_raw_dirent(rd); | |
ced22070 | 573 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
574 | ret = PTR_ERR(fd); |
575 | goto fail; | |
1da177e4 LT |
576 | } |
577 | ||
578 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 579 | inc_nlink(dir_i); |
1da177e4 LT |
580 | |
581 | jffs2_free_raw_dirent(rd); | |
582 | ||
583 | /* Link the fd into the inode's list, obsoleting an old | |
584 | one if necessary. */ | |
585 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
586 | ||
ced22070 | 587 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
588 | jffs2_complete_reservation(c); |
589 | ||
590 | d_instantiate(dentry, inode); | |
e72e6497 | 591 | unlock_new_inode(inode); |
1da177e4 | 592 | return 0; |
f324e4cb DW |
593 | |
594 | fail: | |
41cce647 | 595 | iget_failed(inode); |
f324e4cb | 596 | return ret; |
1da177e4 LT |
597 | } |
598 | ||
599 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
600 | { | |
27c72b04 DW |
601 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
602 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
603 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
604 | struct jffs2_full_dirent *fd; | |
605 | int ret; | |
27c72b04 | 606 | uint32_t now = get_seconds(); |
1da177e4 LT |
607 | |
608 | for (fd = f->dents ; fd; fd = fd->next) { | |
609 | if (fd->ino) | |
610 | return -ENOTEMPTY; | |
611 | } | |
27c72b04 DW |
612 | |
613 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
614 | dentry->d_name.len, f, now); | |
615 | if (!ret) { | |
616 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
617 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 618 | drop_nlink(dir_i); |
27c72b04 | 619 | } |
1da177e4 LT |
620 | return ret; |
621 | } | |
622 | ||
265489f0 | 623 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
624 | { |
625 | struct jffs2_inode_info *f, *dir_f; | |
626 | struct jffs2_sb_info *c; | |
627 | struct inode *inode; | |
628 | struct jffs2_raw_inode *ri; | |
629 | struct jffs2_raw_dirent *rd; | |
630 | struct jffs2_full_dnode *fn; | |
631 | struct jffs2_full_dirent *fd; | |
632 | int namelen; | |
aef9ab47 | 633 | union jffs2_device_node dev; |
1da177e4 | 634 | int devlen = 0; |
9fe4854c | 635 | uint32_t alloclen; |
1da177e4 LT |
636 | int ret; |
637 | ||
aef9ab47 | 638 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
639 | return -EINVAL; |
640 | ||
641 | ri = jffs2_alloc_raw_inode(); | |
642 | if (!ri) | |
643 | return -ENOMEM; | |
182ec4ee | 644 | |
1da177e4 | 645 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 646 | |
aef9ab47 DW |
647 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
648 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
649 | |
650 | /* Try to reserve enough space for both node and dirent. | |
651 | * Just the node will do for now, though | |
1da177e4 LT |
652 | */ |
653 | namelen = dentry->d_name.len; | |
9fe4854c | 654 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 655 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
656 | |
657 | if (ret) { | |
658 | jffs2_free_raw_inode(ri); | |
659 | return ret; | |
660 | } | |
661 | ||
cfc8dc6f | 662 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
663 | |
664 | if (IS_ERR(inode)) { | |
665 | jffs2_free_raw_inode(ri); | |
666 | jffs2_complete_reservation(c); | |
667 | return PTR_ERR(inode); | |
668 | } | |
669 | inode->i_op = &jffs2_file_inode_operations; | |
670 | init_special_inode(inode, inode->i_mode, rdev); | |
671 | ||
672 | f = JFFS2_INODE_INFO(inode); | |
673 | ||
674 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
675 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
676 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
677 | ||
678 | ri->compr = JFFS2_COMPR_NONE; | |
679 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
680 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 681 | |
9fe4854c | 682 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
683 | |
684 | jffs2_free_raw_inode(ri); | |
685 | ||
686 | if (IS_ERR(fn)) { | |
687 | /* Eeek. Wave bye bye */ | |
ced22070 | 688 | mutex_unlock(&f->sem); |
1da177e4 | 689 | jffs2_complete_reservation(c); |
f324e4cb DW |
690 | ret = PTR_ERR(fn); |
691 | goto fail; | |
1da177e4 | 692 | } |
182ec4ee | 693 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
694 | obsoleted by the first data write |
695 | */ | |
696 | f->metadata = fn; | |
ced22070 | 697 | mutex_unlock(&f->sem); |
1da177e4 LT |
698 | |
699 | jffs2_complete_reservation(c); | |
aa98d7cf | 700 | |
2a7dba39 | 701 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
702 | if (ret) |
703 | goto fail; | |
704 | ||
cfc8dc6f | 705 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
706 | if (ret) |
707 | goto fail; | |
aa98d7cf | 708 | |
9fe4854c DW |
709 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
710 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
711 | if (ret) |
712 | goto fail; | |
1da177e4 LT |
713 | |
714 | rd = jffs2_alloc_raw_dirent(); | |
715 | if (!rd) { | |
716 | /* Argh. Now we treat it like a normal delete */ | |
717 | jffs2_complete_reservation(c); | |
f324e4cb DW |
718 | ret = -ENOMEM; |
719 | goto fail; | |
1da177e4 LT |
720 | } |
721 | ||
722 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 723 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
724 | |
725 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
726 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
727 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
728 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
729 | ||
730 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
731 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
732 | rd->ino = cpu_to_je32(inode->i_ino); | |
733 | rd->mctime = cpu_to_je32(get_seconds()); | |
734 | rd->nsize = namelen; | |
735 | ||
736 | /* XXX: This is ugly. */ | |
737 | rd->type = (mode & S_IFMT) >> 12; | |
738 | ||
739 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
740 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
741 | ||
9fe4854c | 742 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 743 | |
1da177e4 | 744 | if (IS_ERR(fd)) { |
182ec4ee | 745 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
746 | as if it were the final unlink() */ |
747 | jffs2_complete_reservation(c); | |
748 | jffs2_free_raw_dirent(rd); | |
ced22070 | 749 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
750 | ret = PTR_ERR(fd); |
751 | goto fail; | |
1da177e4 LT |
752 | } |
753 | ||
754 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
755 | ||
756 | jffs2_free_raw_dirent(rd); | |
757 | ||
758 | /* Link the fd into the inode's list, obsoleting an old | |
759 | one if necessary. */ | |
760 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
761 | ||
ced22070 | 762 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
763 | jffs2_complete_reservation(c); |
764 | ||
765 | d_instantiate(dentry, inode); | |
e72e6497 | 766 | unlock_new_inode(inode); |
1da177e4 | 767 | return 0; |
f324e4cb DW |
768 | |
769 | fail: | |
41cce647 | 770 | iget_failed(inode); |
f324e4cb | 771 | return ret; |
1da177e4 LT |
772 | } |
773 | ||
774 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 775 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
776 | { |
777 | int ret; | |
778 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
779 | struct jffs2_inode_info *victim_f = NULL; | |
780 | uint8_t type; | |
3a69e0cd | 781 | uint32_t now; |
1da177e4 | 782 | |
182ec4ee | 783 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
784 | * file over a directory and vice versa, but if it's a directory, |
785 | * the VFS can't check whether the victim is empty. The filesystem | |
786 | * needs to do that for itself. | |
787 | */ | |
788 | if (new_dentry->d_inode) { | |
789 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
790 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
791 | struct jffs2_full_dirent *fd; | |
792 | ||
ced22070 | 793 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
794 | for (fd = victim_f->dents; fd; fd = fd->next) { |
795 | if (fd->ino) { | |
ced22070 | 796 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
797 | return -ENOTEMPTY; |
798 | } | |
799 | } | |
ced22070 | 800 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
801 | } |
802 | } | |
803 | ||
804 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 805 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
806 | then getting -ENOSPC, is quite bad :) |
807 | */ | |
808 | ||
809 | /* Make a hard link */ | |
182ec4ee | 810 | |
1da177e4 LT |
811 | /* XXX: This is ugly */ |
812 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
813 | if (!type) type = DT_REG; | |
814 | ||
3a69e0cd | 815 | now = get_seconds(); |
182ec4ee | 816 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 817 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 818 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
819 | |
820 | if (ret) | |
821 | return ret; | |
822 | ||
823 | if (victim_f) { | |
824 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 825 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
826 | /* Don't oops if the victim was a dirent pointing to an |
827 | inode which didn't exist. */ | |
828 | if (victim_f->inocache) { | |
ced22070 | 829 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
830 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
831 | victim_f->inocache->pino_nlink = 0; | |
832 | else | |
833 | victim_f->inocache->pino_nlink--; | |
ced22070 | 834 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
835 | } |
836 | } | |
837 | ||
182ec4ee | 838 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
839 | increase i_nlink on its new parent */ |
840 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 841 | inc_nlink(new_dir_i); |
1da177e4 LT |
842 | |
843 | /* Unlink the original */ | |
182ec4ee | 844 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 845 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
846 | |
847 | /* We don't touch inode->i_nlink */ | |
848 | ||
849 | if (ret) { | |
850 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
851 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 852 | mutex_lock(&f->sem); |
d8c76e6f | 853 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
854 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
855 | f->inocache->pino_nlink++; | |
ced22070 | 856 | mutex_unlock(&f->sem); |
1da177e4 LT |
857 | |
858 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
859 | /* Might as well let the VFS know */ | |
860 | d_instantiate(new_dentry, old_dentry->d_inode); | |
7de9c6ee | 861 | ihold(old_dentry->d_inode); |
3a69e0cd | 862 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
863 | return ret; |
864 | } | |
865 | ||
866 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 867 | drop_nlink(old_dir_i); |
1da177e4 | 868 | |
3a69e0cd AB |
869 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
870 | ||
1da177e4 LT |
871 | return 0; |
872 | } | |
873 |