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; | |
78 | struct jffs2_sb_info *c; | |
79 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
80 | uint32_t ino = 0; | |
81 | struct inode *inode = NULL; | |
82 | ||
83 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
84 | ||
373d5e71 RP |
85 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
86 | return ERR_PTR(-ENAMETOOLONG); | |
87 | ||
1da177e4 LT |
88 | dir_f = JFFS2_INODE_INFO(dir_i); |
89 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
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 DH |
106 | inode = jffs2_iget(dir_i->i_sb, ino); |
107 | if (IS_ERR(inode)) { | |
1da177e4 | 108 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
5451f79f | 109 | return ERR_CAST(inode); |
1da177e4 LT |
110 | } |
111 | } | |
112 | ||
8966c5e0 | 113 | return d_splice_alias(inode, target); |
1da177e4 LT |
114 | } |
115 | ||
116 | /***********************************************************************/ | |
117 | ||
118 | ||
119 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
120 | { | |
121 | struct jffs2_inode_info *f; | |
122 | struct jffs2_sb_info *c; | |
ec2e203c | 123 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
124 | struct jffs2_full_dirent *fd; |
125 | unsigned long offset, curofs; | |
126 | ||
ec2e203c | 127 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
128 | |
129 | f = JFFS2_INODE_INFO(inode); | |
130 | c = JFFS2_SB_INFO(inode->i_sb); | |
131 | ||
132 | offset = filp->f_pos; | |
133 | ||
134 | if (offset == 0) { | |
135 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
136 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
137 | goto out; | |
138 | offset++; | |
139 | } | |
140 | if (offset == 1) { | |
ec2e203c | 141 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
142 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
143 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
144 | goto out; | |
145 | offset++; | |
146 | } | |
147 | ||
148 | curofs=1; | |
ced22070 | 149 | mutex_lock(&f->sem); |
1da177e4 LT |
150 | for (fd = f->dents; fd; fd = fd->next) { |
151 | ||
152 | curofs++; | |
153 | /* First loop: curofs = 2; offset = 2 */ | |
154 | if (curofs < offset) { | |
182ec4ee | 155 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
156 | fd->name, fd->ino, fd->type, curofs, offset)); |
157 | continue; | |
158 | } | |
159 | if (!fd->ino) { | |
160 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
161 | offset++; | |
162 | continue; | |
163 | } | |
164 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
165 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
166 | break; | |
167 | offset++; | |
168 | } | |
ced22070 | 169 | mutex_unlock(&f->sem); |
1da177e4 LT |
170 | out: |
171 | filp->f_pos = offset; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | /***********************************************************************/ | |
176 | ||
177 | ||
178 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
179 | struct nameidata *nd) | |
180 | { | |
181 | struct jffs2_raw_inode *ri; | |
182 | struct jffs2_inode_info *f, *dir_f; | |
183 | struct jffs2_sb_info *c; | |
184 | struct inode *inode; | |
185 | int ret; | |
186 | ||
187 | ri = jffs2_alloc_raw_inode(); | |
188 | if (!ri) | |
189 | return -ENOMEM; | |
182ec4ee | 190 | |
1da177e4 LT |
191 | c = JFFS2_SB_INFO(dir_i->i_sb); |
192 | ||
193 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
194 | ||
cfc8dc6f | 195 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
196 | |
197 | if (IS_ERR(inode)) { | |
198 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
199 | jffs2_free_raw_inode(ri); | |
200 | return PTR_ERR(inode); | |
201 | } | |
202 | ||
203 | inode->i_op = &jffs2_file_inode_operations; | |
204 | inode->i_fop = &jffs2_file_operations; | |
205 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
206 | inode->i_mapping->nrpages = 0; | |
207 | ||
208 | f = JFFS2_INODE_INFO(inode); | |
209 | dir_f = JFFS2_INODE_INFO(dir_i); | |
210 | ||
590fe34c DW |
211 | /* jffs2_do_create() will want to lock it, _after_ reserving |
212 | space and taking c-alloc_sem. If we keep it locked here, | |
213 | lockdep gets unhappy (although it's a false positive; | |
214 | nothing else will be looking at this inode yet so there's | |
215 | no chance of AB-BA deadlock involving its f->sem). */ | |
216 | mutex_unlock(&f->sem); | |
217 | ||
182ec4ee | 218 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 | 219 | dentry->d_name.name, dentry->d_name.len); |
aa98d7cf KK |
220 | if (ret) |
221 | goto fail; | |
1da177e4 LT |
222 | |
223 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
224 | ||
225 | jffs2_free_raw_inode(ri); | |
1da177e4 LT |
226 | |
227 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
27c72b04 DW |
228 | inode->i_ino, inode->i_mode, inode->i_nlink, |
229 | f->inocache->pino_nlink, inode->i_mapping->nrpages)); | |
e72e6497 DW |
230 | |
231 | d_instantiate(dentry, inode); | |
232 | unlock_new_inode(inode); | |
1da177e4 | 233 | return 0; |
aa98d7cf KK |
234 | |
235 | fail: | |
41cce647 | 236 | iget_failed(inode); |
aa98d7cf KK |
237 | jffs2_free_raw_inode(ri); |
238 | return ret; | |
1da177e4 LT |
239 | } |
240 | ||
241 | /***********************************************************************/ | |
242 | ||
243 | ||
244 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
245 | { | |
246 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
247 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
248 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
249 | int ret; | |
3a69e0cd | 250 | uint32_t now = get_seconds(); |
1da177e4 | 251 | |
182ec4ee | 252 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 253 | dentry->d_name.len, dead_f, now); |
1da177e4 | 254 | if (dead_f->inocache) |
27c72b04 | 255 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
3a69e0cd AB |
256 | if (!ret) |
257 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
258 | return ret; |
259 | } | |
260 | /***********************************************************************/ | |
261 | ||
262 | ||
263 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
264 | { | |
265 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
266 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
267 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
268 | int ret; | |
269 | uint8_t type; | |
3a69e0cd | 270 | uint32_t now; |
1da177e4 LT |
271 | |
272 | /* Don't let people make hard links to bad inodes. */ | |
273 | if (!f->inocache) | |
274 | return -EIO; | |
275 | ||
276 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
277 | return -EPERM; | |
278 | ||
279 | /* XXX: This is ugly */ | |
280 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
281 | if (!type) type = DT_REG; | |
282 | ||
3a69e0cd AB |
283 | now = get_seconds(); |
284 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
285 | |
286 | if (!ret) { | |
ced22070 | 287 | mutex_lock(&f->sem); |
27c72b04 | 288 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
ced22070 | 289 | mutex_unlock(&f->sem); |
1da177e4 | 290 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 291 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
7de9c6ee | 292 | ihold(old_dentry->d_inode); |
1da177e4 LT |
293 | } |
294 | return ret; | |
295 | } | |
296 | ||
297 | /***********************************************************************/ | |
298 | ||
299 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
300 | { | |
301 | struct jffs2_inode_info *f, *dir_f; | |
302 | struct jffs2_sb_info *c; | |
303 | struct inode *inode; | |
304 | struct jffs2_raw_inode *ri; | |
305 | struct jffs2_raw_dirent *rd; | |
306 | struct jffs2_full_dnode *fn; | |
307 | struct jffs2_full_dirent *fd; | |
308 | int namelen; | |
9fe4854c | 309 | uint32_t alloclen; |
32f1a95d | 310 | int ret, targetlen = strlen(target); |
1da177e4 LT |
311 | |
312 | /* FIXME: If you care. We'd need to use frags for the target | |
313 | if it grows much more than this */ | |
32f1a95d | 314 | if (targetlen > 254) |
bde86fec | 315 | return -ENAMETOOLONG; |
1da177e4 LT |
316 | |
317 | ri = jffs2_alloc_raw_inode(); | |
318 | ||
319 | if (!ri) | |
320 | return -ENOMEM; | |
182ec4ee | 321 | |
1da177e4 | 322 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
323 | |
324 | /* Try to reserve enough space for both node and dirent. | |
325 | * Just the node will do for now, though | |
1da177e4 LT |
326 | */ |
327 | namelen = dentry->d_name.len; | |
9fe4854c DW |
328 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
329 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
330 | |
331 | if (ret) { | |
332 | jffs2_free_raw_inode(ri); | |
333 | return ret; | |
334 | } | |
335 | ||
cfc8dc6f | 336 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
337 | |
338 | if (IS_ERR(inode)) { | |
339 | jffs2_free_raw_inode(ri); | |
340 | jffs2_complete_reservation(c); | |
341 | return PTR_ERR(inode); | |
342 | } | |
343 | ||
344 | inode->i_op = &jffs2_symlink_inode_operations; | |
345 | ||
346 | f = JFFS2_INODE_INFO(inode); | |
347 | ||
32f1a95d | 348 | inode->i_size = targetlen; |
1da177e4 LT |
349 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
350 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
351 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
352 | ||
353 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 354 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 355 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 356 | |
9fe4854c | 357 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
358 | |
359 | jffs2_free_raw_inode(ri); | |
360 | ||
361 | if (IS_ERR(fn)) { | |
362 | /* Eeek. Wave bye bye */ | |
ced22070 | 363 | mutex_unlock(&f->sem); |
1da177e4 | 364 | jffs2_complete_reservation(c); |
f324e4cb DW |
365 | ret = PTR_ERR(fn); |
366 | goto fail; | |
1da177e4 | 367 | } |
32f1a95d | 368 | |
2b79adcc | 369 | /* We use f->target field to store the target path. */ |
04aadf36 | 370 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 371 | if (!f->target) { |
32f1a95d | 372 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 373 | mutex_unlock(&f->sem); |
32f1a95d | 374 | jffs2_complete_reservation(c); |
f324e4cb DW |
375 | ret = -ENOMEM; |
376 | goto fail; | |
32f1a95d AB |
377 | } |
378 | ||
2b79adcc | 379 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); |
32f1a95d | 380 | |
182ec4ee | 381 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
382 | obsoleted by the first data write |
383 | */ | |
384 | f->metadata = fn; | |
ced22070 | 385 | mutex_unlock(&f->sem); |
1da177e4 LT |
386 | |
387 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
388 | |
389 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
390 | if (ret) |
391 | goto fail; | |
392 | ||
cfc8dc6f | 393 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
394 | if (ret) |
395 | goto fail; | |
aa98d7cf | 396 | |
9fe4854c DW |
397 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
398 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
399 | if (ret) |
400 | goto fail; | |
1da177e4 LT |
401 | |
402 | rd = jffs2_alloc_raw_dirent(); | |
403 | if (!rd) { | |
404 | /* Argh. Now we treat it like a normal delete */ | |
405 | jffs2_complete_reservation(c); | |
f324e4cb DW |
406 | ret = -ENOMEM; |
407 | goto fail; | |
1da177e4 LT |
408 | } |
409 | ||
410 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 411 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
412 | |
413 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
414 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
415 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
416 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
417 | ||
418 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
419 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
420 | rd->ino = cpu_to_je32(inode->i_ino); | |
421 | rd->mctime = cpu_to_je32(get_seconds()); | |
422 | rd->nsize = namelen; | |
423 | rd->type = DT_LNK; | |
424 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
425 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
426 | ||
9fe4854c | 427 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
428 | |
429 | if (IS_ERR(fd)) { | |
182ec4ee | 430 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
431 | as if it were the final unlink() */ |
432 | jffs2_complete_reservation(c); | |
433 | jffs2_free_raw_dirent(rd); | |
ced22070 | 434 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
435 | ret = PTR_ERR(fd); |
436 | goto fail; | |
1da177e4 LT |
437 | } |
438 | ||
439 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
440 | ||
441 | jffs2_free_raw_dirent(rd); | |
442 | ||
443 | /* Link the fd into the inode's list, obsoleting an old | |
444 | one if necessary. */ | |
445 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
446 | ||
ced22070 | 447 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
448 | jffs2_complete_reservation(c); |
449 | ||
450 | d_instantiate(dentry, inode); | |
e72e6497 | 451 | unlock_new_inode(inode); |
1da177e4 | 452 | return 0; |
f324e4cb DW |
453 | |
454 | fail: | |
41cce647 | 455 | iget_failed(inode); |
f324e4cb | 456 | return ret; |
1da177e4 LT |
457 | } |
458 | ||
459 | ||
460 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
461 | { | |
462 | struct jffs2_inode_info *f, *dir_f; | |
463 | struct jffs2_sb_info *c; | |
464 | struct inode *inode; | |
465 | struct jffs2_raw_inode *ri; | |
466 | struct jffs2_raw_dirent *rd; | |
467 | struct jffs2_full_dnode *fn; | |
468 | struct jffs2_full_dirent *fd; | |
469 | int namelen; | |
9fe4854c | 470 | uint32_t alloclen; |
1da177e4 LT |
471 | int ret; |
472 | ||
473 | mode |= S_IFDIR; | |
474 | ||
475 | ri = jffs2_alloc_raw_inode(); | |
476 | if (!ri) | |
477 | return -ENOMEM; | |
182ec4ee | 478 | |
1da177e4 LT |
479 | c = JFFS2_SB_INFO(dir_i->i_sb); |
480 | ||
182ec4ee TG |
481 | /* Try to reserve enough space for both node and dirent. |
482 | * Just the node will do for now, though | |
1da177e4 LT |
483 | */ |
484 | namelen = dentry->d_name.len; | |
9fe4854c DW |
485 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
486 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
487 | |
488 | if (ret) { | |
489 | jffs2_free_raw_inode(ri); | |
490 | return ret; | |
491 | } | |
492 | ||
cfc8dc6f | 493 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
494 | |
495 | if (IS_ERR(inode)) { | |
496 | jffs2_free_raw_inode(ri); | |
497 | jffs2_complete_reservation(c); | |
498 | return PTR_ERR(inode); | |
499 | } | |
500 | ||
501 | inode->i_op = &jffs2_dir_inode_operations; | |
502 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
503 | |
504 | f = JFFS2_INODE_INFO(inode); | |
505 | ||
27c72b04 DW |
506 | /* Directories get nlink 2 at start */ |
507 | inode->i_nlink = 2; | |
508 | /* but ic->pino_nlink is the parent ino# */ | |
509 | f->inocache->pino_nlink = dir_i->i_ino; | |
510 | ||
1da177e4 LT |
511 | ri->data_crc = cpu_to_je32(0); |
512 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 513 | |
9fe4854c | 514 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
515 | |
516 | jffs2_free_raw_inode(ri); | |
517 | ||
518 | if (IS_ERR(fn)) { | |
519 | /* Eeek. Wave bye bye */ | |
ced22070 | 520 | mutex_unlock(&f->sem); |
1da177e4 | 521 | jffs2_complete_reservation(c); |
f324e4cb DW |
522 | ret = PTR_ERR(fn); |
523 | goto fail; | |
1da177e4 | 524 | } |
182ec4ee | 525 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
526 | obsoleted by the first data write |
527 | */ | |
528 | f->metadata = fn; | |
ced22070 | 529 | mutex_unlock(&f->sem); |
1da177e4 LT |
530 | |
531 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
532 | |
533 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
534 | if (ret) |
535 | goto fail; | |
536 | ||
cfc8dc6f | 537 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
538 | if (ret) |
539 | goto fail; | |
aa98d7cf | 540 | |
9fe4854c DW |
541 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
542 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
543 | if (ret) |
544 | goto fail; | |
182ec4ee | 545 | |
1da177e4 LT |
546 | rd = jffs2_alloc_raw_dirent(); |
547 | if (!rd) { | |
548 | /* Argh. Now we treat it like a normal delete */ | |
549 | jffs2_complete_reservation(c); | |
f324e4cb DW |
550 | ret = -ENOMEM; |
551 | goto fail; | |
1da177e4 LT |
552 | } |
553 | ||
554 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 555 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
556 | |
557 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
558 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
559 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
560 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
561 | ||
562 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
563 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
564 | rd->ino = cpu_to_je32(inode->i_ino); | |
565 | rd->mctime = cpu_to_je32(get_seconds()); | |
566 | rd->nsize = namelen; | |
567 | rd->type = DT_DIR; | |
568 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
569 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
570 | ||
9fe4854c | 571 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 572 | |
1da177e4 | 573 | if (IS_ERR(fd)) { |
182ec4ee | 574 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
575 | as if it were the final unlink() */ |
576 | jffs2_complete_reservation(c); | |
577 | jffs2_free_raw_dirent(rd); | |
ced22070 | 578 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
579 | ret = PTR_ERR(fd); |
580 | goto fail; | |
1da177e4 LT |
581 | } |
582 | ||
583 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 584 | inc_nlink(dir_i); |
1da177e4 LT |
585 | |
586 | jffs2_free_raw_dirent(rd); | |
587 | ||
588 | /* Link the fd into the inode's list, obsoleting an old | |
589 | one if necessary. */ | |
590 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
591 | ||
ced22070 | 592 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
593 | jffs2_complete_reservation(c); |
594 | ||
595 | d_instantiate(dentry, inode); | |
e72e6497 | 596 | unlock_new_inode(inode); |
1da177e4 | 597 | return 0; |
f324e4cb DW |
598 | |
599 | fail: | |
41cce647 | 600 | iget_failed(inode); |
f324e4cb | 601 | return ret; |
1da177e4 LT |
602 | } |
603 | ||
604 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
605 | { | |
27c72b04 DW |
606 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
607 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
608 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
609 | struct jffs2_full_dirent *fd; | |
610 | int ret; | |
27c72b04 | 611 | uint32_t now = get_seconds(); |
1da177e4 LT |
612 | |
613 | for (fd = f->dents ; fd; fd = fd->next) { | |
614 | if (fd->ino) | |
615 | return -ENOTEMPTY; | |
616 | } | |
27c72b04 DW |
617 | |
618 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
619 | dentry->d_name.len, f, now); | |
620 | if (!ret) { | |
621 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
622 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 623 | drop_nlink(dir_i); |
27c72b04 | 624 | } |
1da177e4 LT |
625 | return ret; |
626 | } | |
627 | ||
265489f0 | 628 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
629 | { |
630 | struct jffs2_inode_info *f, *dir_f; | |
631 | struct jffs2_sb_info *c; | |
632 | struct inode *inode; | |
633 | struct jffs2_raw_inode *ri; | |
634 | struct jffs2_raw_dirent *rd; | |
635 | struct jffs2_full_dnode *fn; | |
636 | struct jffs2_full_dirent *fd; | |
637 | int namelen; | |
aef9ab47 | 638 | union jffs2_device_node dev; |
1da177e4 | 639 | int devlen = 0; |
9fe4854c | 640 | uint32_t alloclen; |
1da177e4 LT |
641 | int ret; |
642 | ||
aef9ab47 | 643 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
644 | return -EINVAL; |
645 | ||
646 | ri = jffs2_alloc_raw_inode(); | |
647 | if (!ri) | |
648 | return -ENOMEM; | |
182ec4ee | 649 | |
1da177e4 | 650 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 651 | |
aef9ab47 DW |
652 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
653 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
654 | |
655 | /* Try to reserve enough space for both node and dirent. | |
656 | * Just the node will do for now, though | |
1da177e4 LT |
657 | */ |
658 | namelen = dentry->d_name.len; | |
9fe4854c | 659 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 660 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
661 | |
662 | if (ret) { | |
663 | jffs2_free_raw_inode(ri); | |
664 | return ret; | |
665 | } | |
666 | ||
cfc8dc6f | 667 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
668 | |
669 | if (IS_ERR(inode)) { | |
670 | jffs2_free_raw_inode(ri); | |
671 | jffs2_complete_reservation(c); | |
672 | return PTR_ERR(inode); | |
673 | } | |
674 | inode->i_op = &jffs2_file_inode_operations; | |
675 | init_special_inode(inode, inode->i_mode, rdev); | |
676 | ||
677 | f = JFFS2_INODE_INFO(inode); | |
678 | ||
679 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
680 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
681 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
682 | ||
683 | ri->compr = JFFS2_COMPR_NONE; | |
684 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
685 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 686 | |
9fe4854c | 687 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
688 | |
689 | jffs2_free_raw_inode(ri); | |
690 | ||
691 | if (IS_ERR(fn)) { | |
692 | /* Eeek. Wave bye bye */ | |
ced22070 | 693 | mutex_unlock(&f->sem); |
1da177e4 | 694 | jffs2_complete_reservation(c); |
f324e4cb DW |
695 | ret = PTR_ERR(fn); |
696 | goto fail; | |
1da177e4 | 697 | } |
182ec4ee | 698 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
699 | obsoleted by the first data write |
700 | */ | |
701 | f->metadata = fn; | |
ced22070 | 702 | mutex_unlock(&f->sem); |
1da177e4 LT |
703 | |
704 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
705 | |
706 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
707 | if (ret) |
708 | goto fail; | |
709 | ||
cfc8dc6f | 710 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
711 | if (ret) |
712 | goto fail; | |
aa98d7cf | 713 | |
9fe4854c DW |
714 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
715 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
716 | if (ret) |
717 | goto fail; | |
1da177e4 LT |
718 | |
719 | rd = jffs2_alloc_raw_dirent(); | |
720 | if (!rd) { | |
721 | /* Argh. Now we treat it like a normal delete */ | |
722 | jffs2_complete_reservation(c); | |
f324e4cb DW |
723 | ret = -ENOMEM; |
724 | goto fail; | |
1da177e4 LT |
725 | } |
726 | ||
727 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 728 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
729 | |
730 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
731 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
732 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
733 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
734 | ||
735 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
736 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
737 | rd->ino = cpu_to_je32(inode->i_ino); | |
738 | rd->mctime = cpu_to_je32(get_seconds()); | |
739 | rd->nsize = namelen; | |
740 | ||
741 | /* XXX: This is ugly. */ | |
742 | rd->type = (mode & S_IFMT) >> 12; | |
743 | ||
744 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
745 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
746 | ||
9fe4854c | 747 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 748 | |
1da177e4 | 749 | if (IS_ERR(fd)) { |
182ec4ee | 750 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
751 | as if it were the final unlink() */ |
752 | jffs2_complete_reservation(c); | |
753 | jffs2_free_raw_dirent(rd); | |
ced22070 | 754 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
755 | ret = PTR_ERR(fd); |
756 | goto fail; | |
1da177e4 LT |
757 | } |
758 | ||
759 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
760 | ||
761 | jffs2_free_raw_dirent(rd); | |
762 | ||
763 | /* Link the fd into the inode's list, obsoleting an old | |
764 | one if necessary. */ | |
765 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
766 | ||
ced22070 | 767 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
768 | jffs2_complete_reservation(c); |
769 | ||
770 | d_instantiate(dentry, inode); | |
e72e6497 | 771 | unlock_new_inode(inode); |
1da177e4 | 772 | return 0; |
f324e4cb DW |
773 | |
774 | fail: | |
41cce647 | 775 | iget_failed(inode); |
f324e4cb | 776 | return ret; |
1da177e4 LT |
777 | } |
778 | ||
779 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 780 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
781 | { |
782 | int ret; | |
783 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
784 | struct jffs2_inode_info *victim_f = NULL; | |
785 | uint8_t type; | |
3a69e0cd | 786 | uint32_t now; |
1da177e4 | 787 | |
182ec4ee | 788 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
789 | * file over a directory and vice versa, but if it's a directory, |
790 | * the VFS can't check whether the victim is empty. The filesystem | |
791 | * needs to do that for itself. | |
792 | */ | |
793 | if (new_dentry->d_inode) { | |
794 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
795 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
796 | struct jffs2_full_dirent *fd; | |
797 | ||
ced22070 | 798 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
799 | for (fd = victim_f->dents; fd; fd = fd->next) { |
800 | if (fd->ino) { | |
ced22070 | 801 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
802 | return -ENOTEMPTY; |
803 | } | |
804 | } | |
ced22070 | 805 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
806 | } |
807 | } | |
808 | ||
809 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 810 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
811 | then getting -ENOSPC, is quite bad :) |
812 | */ | |
813 | ||
814 | /* Make a hard link */ | |
182ec4ee | 815 | |
1da177e4 LT |
816 | /* XXX: This is ugly */ |
817 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
818 | if (!type) type = DT_REG; | |
819 | ||
3a69e0cd | 820 | now = get_seconds(); |
182ec4ee | 821 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 822 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 823 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
824 | |
825 | if (ret) | |
826 | return ret; | |
827 | ||
828 | if (victim_f) { | |
829 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 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 |