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: | |
236 | make_bad_inode(inode); | |
e72e6497 | 237 | unlock_new_inode(inode); |
aa98d7cf KK |
238 | iput(inode); |
239 | jffs2_free_raw_inode(ri); | |
240 | return ret; | |
1da177e4 LT |
241 | } |
242 | ||
243 | /***********************************************************************/ | |
244 | ||
245 | ||
246 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
247 | { | |
248 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
249 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
250 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
251 | int ret; | |
3a69e0cd | 252 | uint32_t now = get_seconds(); |
1da177e4 | 253 | |
182ec4ee | 254 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 255 | dentry->d_name.len, dead_f, now); |
1da177e4 | 256 | if (dead_f->inocache) |
27c72b04 | 257 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
3a69e0cd AB |
258 | if (!ret) |
259 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
260 | return ret; |
261 | } | |
262 | /***********************************************************************/ | |
263 | ||
264 | ||
265 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
266 | { | |
267 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
268 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
269 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
270 | int ret; | |
271 | uint8_t type; | |
3a69e0cd | 272 | uint32_t now; |
1da177e4 LT |
273 | |
274 | /* Don't let people make hard links to bad inodes. */ | |
275 | if (!f->inocache) | |
276 | return -EIO; | |
277 | ||
278 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
279 | return -EPERM; | |
280 | ||
281 | /* XXX: This is ugly */ | |
282 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
283 | if (!type) type = DT_REG; | |
284 | ||
3a69e0cd AB |
285 | now = get_seconds(); |
286 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
287 | |
288 | if (!ret) { | |
ced22070 | 289 | mutex_lock(&f->sem); |
27c72b04 | 290 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
ced22070 | 291 | mutex_unlock(&f->sem); |
1da177e4 | 292 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 293 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
294 | atomic_inc(&old_dentry->d_inode->i_count); |
295 | } | |
296 | return ret; | |
297 | } | |
298 | ||
299 | /***********************************************************************/ | |
300 | ||
301 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
302 | { | |
303 | struct jffs2_inode_info *f, *dir_f; | |
304 | struct jffs2_sb_info *c; | |
305 | struct inode *inode; | |
306 | struct jffs2_raw_inode *ri; | |
307 | struct jffs2_raw_dirent *rd; | |
308 | struct jffs2_full_dnode *fn; | |
309 | struct jffs2_full_dirent *fd; | |
310 | int namelen; | |
9fe4854c | 311 | uint32_t alloclen; |
32f1a95d | 312 | int ret, targetlen = strlen(target); |
1da177e4 LT |
313 | |
314 | /* FIXME: If you care. We'd need to use frags for the target | |
315 | if it grows much more than this */ | |
32f1a95d | 316 | if (targetlen > 254) |
bde86fec | 317 | return -ENAMETOOLONG; |
1da177e4 LT |
318 | |
319 | ri = jffs2_alloc_raw_inode(); | |
320 | ||
321 | if (!ri) | |
322 | return -ENOMEM; | |
182ec4ee | 323 | |
1da177e4 | 324 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
325 | |
326 | /* Try to reserve enough space for both node and dirent. | |
327 | * Just the node will do for now, though | |
1da177e4 LT |
328 | */ |
329 | namelen = dentry->d_name.len; | |
9fe4854c DW |
330 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
331 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
332 | |
333 | if (ret) { | |
334 | jffs2_free_raw_inode(ri); | |
335 | return ret; | |
336 | } | |
337 | ||
cfc8dc6f | 338 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
339 | |
340 | if (IS_ERR(inode)) { | |
341 | jffs2_free_raw_inode(ri); | |
342 | jffs2_complete_reservation(c); | |
343 | return PTR_ERR(inode); | |
344 | } | |
345 | ||
346 | inode->i_op = &jffs2_symlink_inode_operations; | |
347 | ||
348 | f = JFFS2_INODE_INFO(inode); | |
349 | ||
32f1a95d | 350 | inode->i_size = targetlen; |
1da177e4 LT |
351 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
352 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
353 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
354 | ||
355 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 356 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 357 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 358 | |
9fe4854c | 359 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
360 | |
361 | jffs2_free_raw_inode(ri); | |
362 | ||
363 | if (IS_ERR(fn)) { | |
364 | /* Eeek. Wave bye bye */ | |
ced22070 | 365 | mutex_unlock(&f->sem); |
1da177e4 | 366 | jffs2_complete_reservation(c); |
f324e4cb DW |
367 | ret = PTR_ERR(fn); |
368 | goto fail; | |
1da177e4 | 369 | } |
32f1a95d | 370 | |
2b79adcc AB |
371 | /* We use f->target field to store the target path. */ |
372 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); | |
373 | if (!f->target) { | |
32f1a95d | 374 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 375 | mutex_unlock(&f->sem); |
32f1a95d | 376 | jffs2_complete_reservation(c); |
f324e4cb DW |
377 | ret = -ENOMEM; |
378 | goto fail; | |
32f1a95d AB |
379 | } |
380 | ||
2b79adcc AB |
381 | memcpy(f->target, target, targetlen + 1); |
382 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); | |
32f1a95d | 383 | |
182ec4ee | 384 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
385 | obsoleted by the first data write |
386 | */ | |
387 | f->metadata = fn; | |
ced22070 | 388 | mutex_unlock(&f->sem); |
1da177e4 LT |
389 | |
390 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
391 | |
392 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
393 | if (ret) |
394 | goto fail; | |
395 | ||
cfc8dc6f | 396 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
397 | if (ret) |
398 | goto fail; | |
aa98d7cf | 399 | |
9fe4854c DW |
400 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
401 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
402 | if (ret) |
403 | goto fail; | |
1da177e4 LT |
404 | |
405 | rd = jffs2_alloc_raw_dirent(); | |
406 | if (!rd) { | |
407 | /* Argh. Now we treat it like a normal delete */ | |
408 | jffs2_complete_reservation(c); | |
f324e4cb DW |
409 | ret = -ENOMEM; |
410 | goto fail; | |
1da177e4 LT |
411 | } |
412 | ||
413 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 414 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
415 | |
416 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
417 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
418 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
419 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
420 | ||
421 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
422 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
423 | rd->ino = cpu_to_je32(inode->i_ino); | |
424 | rd->mctime = cpu_to_je32(get_seconds()); | |
425 | rd->nsize = namelen; | |
426 | rd->type = DT_LNK; | |
427 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
428 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
429 | ||
9fe4854c | 430 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
431 | |
432 | if (IS_ERR(fd)) { | |
182ec4ee | 433 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
434 | as if it were the final unlink() */ |
435 | jffs2_complete_reservation(c); | |
436 | jffs2_free_raw_dirent(rd); | |
ced22070 | 437 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
438 | ret = PTR_ERR(fd); |
439 | goto fail; | |
1da177e4 LT |
440 | } |
441 | ||
442 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
443 | ||
444 | jffs2_free_raw_dirent(rd); | |
445 | ||
446 | /* Link the fd into the inode's list, obsoleting an old | |
447 | one if necessary. */ | |
448 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
449 | ||
ced22070 | 450 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
451 | jffs2_complete_reservation(c); |
452 | ||
453 | d_instantiate(dentry, inode); | |
e72e6497 | 454 | unlock_new_inode(inode); |
1da177e4 | 455 | return 0; |
f324e4cb DW |
456 | |
457 | fail: | |
458 | make_bad_inode(inode); | |
e72e6497 | 459 | unlock_new_inode(inode); |
f324e4cb DW |
460 | iput(inode); |
461 | return ret; | |
1da177e4 LT |
462 | } |
463 | ||
464 | ||
465 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
466 | { | |
467 | struct jffs2_inode_info *f, *dir_f; | |
468 | struct jffs2_sb_info *c; | |
469 | struct inode *inode; | |
470 | struct jffs2_raw_inode *ri; | |
471 | struct jffs2_raw_dirent *rd; | |
472 | struct jffs2_full_dnode *fn; | |
473 | struct jffs2_full_dirent *fd; | |
474 | int namelen; | |
9fe4854c | 475 | uint32_t alloclen; |
1da177e4 LT |
476 | int ret; |
477 | ||
478 | mode |= S_IFDIR; | |
479 | ||
480 | ri = jffs2_alloc_raw_inode(); | |
481 | if (!ri) | |
482 | return -ENOMEM; | |
182ec4ee | 483 | |
1da177e4 LT |
484 | c = JFFS2_SB_INFO(dir_i->i_sb); |
485 | ||
182ec4ee TG |
486 | /* Try to reserve enough space for both node and dirent. |
487 | * Just the node will do for now, though | |
1da177e4 LT |
488 | */ |
489 | namelen = dentry->d_name.len; | |
9fe4854c DW |
490 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
491 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
492 | |
493 | if (ret) { | |
494 | jffs2_free_raw_inode(ri); | |
495 | return ret; | |
496 | } | |
497 | ||
cfc8dc6f | 498 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
499 | |
500 | if (IS_ERR(inode)) { | |
501 | jffs2_free_raw_inode(ri); | |
502 | jffs2_complete_reservation(c); | |
503 | return PTR_ERR(inode); | |
504 | } | |
505 | ||
506 | inode->i_op = &jffs2_dir_inode_operations; | |
507 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
508 | |
509 | f = JFFS2_INODE_INFO(inode); | |
510 | ||
27c72b04 DW |
511 | /* Directories get nlink 2 at start */ |
512 | inode->i_nlink = 2; | |
513 | /* but ic->pino_nlink is the parent ino# */ | |
514 | f->inocache->pino_nlink = dir_i->i_ino; | |
515 | ||
1da177e4 LT |
516 | ri->data_crc = cpu_to_je32(0); |
517 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 518 | |
9fe4854c | 519 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
520 | |
521 | jffs2_free_raw_inode(ri); | |
522 | ||
523 | if (IS_ERR(fn)) { | |
524 | /* Eeek. Wave bye bye */ | |
ced22070 | 525 | mutex_unlock(&f->sem); |
1da177e4 | 526 | jffs2_complete_reservation(c); |
f324e4cb DW |
527 | ret = PTR_ERR(fn); |
528 | goto fail; | |
1da177e4 | 529 | } |
182ec4ee | 530 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
531 | obsoleted by the first data write |
532 | */ | |
533 | f->metadata = fn; | |
ced22070 | 534 | mutex_unlock(&f->sem); |
1da177e4 LT |
535 | |
536 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
537 | |
538 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
539 | if (ret) |
540 | goto fail; | |
541 | ||
cfc8dc6f | 542 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
543 | if (ret) |
544 | goto fail; | |
aa98d7cf | 545 | |
9fe4854c DW |
546 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
547 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
548 | if (ret) |
549 | goto fail; | |
182ec4ee | 550 | |
1da177e4 LT |
551 | rd = jffs2_alloc_raw_dirent(); |
552 | if (!rd) { | |
553 | /* Argh. Now we treat it like a normal delete */ | |
554 | jffs2_complete_reservation(c); | |
f324e4cb DW |
555 | ret = -ENOMEM; |
556 | goto fail; | |
1da177e4 LT |
557 | } |
558 | ||
559 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 560 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
561 | |
562 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
563 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
564 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
565 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
566 | ||
567 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
568 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
569 | rd->ino = cpu_to_je32(inode->i_ino); | |
570 | rd->mctime = cpu_to_je32(get_seconds()); | |
571 | rd->nsize = namelen; | |
572 | rd->type = DT_DIR; | |
573 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
574 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
575 | ||
9fe4854c | 576 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 577 | |
1da177e4 | 578 | if (IS_ERR(fd)) { |
182ec4ee | 579 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
580 | as if it were the final unlink() */ |
581 | jffs2_complete_reservation(c); | |
582 | jffs2_free_raw_dirent(rd); | |
ced22070 | 583 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
584 | ret = PTR_ERR(fd); |
585 | goto fail; | |
1da177e4 LT |
586 | } |
587 | ||
588 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 589 | inc_nlink(dir_i); |
1da177e4 LT |
590 | |
591 | jffs2_free_raw_dirent(rd); | |
592 | ||
593 | /* Link the fd into the inode's list, obsoleting an old | |
594 | one if necessary. */ | |
595 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
596 | ||
ced22070 | 597 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
598 | jffs2_complete_reservation(c); |
599 | ||
600 | d_instantiate(dentry, inode); | |
e72e6497 | 601 | unlock_new_inode(inode); |
1da177e4 | 602 | return 0; |
f324e4cb DW |
603 | |
604 | fail: | |
605 | make_bad_inode(inode); | |
e72e6497 | 606 | unlock_new_inode(inode); |
f324e4cb DW |
607 | iput(inode); |
608 | return ret; | |
1da177e4 LT |
609 | } |
610 | ||
611 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
612 | { | |
27c72b04 DW |
613 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
614 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
615 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
616 | struct jffs2_full_dirent *fd; | |
617 | int ret; | |
27c72b04 | 618 | uint32_t now = get_seconds(); |
1da177e4 LT |
619 | |
620 | for (fd = f->dents ; fd; fd = fd->next) { | |
621 | if (fd->ino) | |
622 | return -ENOTEMPTY; | |
623 | } | |
27c72b04 DW |
624 | |
625 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
626 | dentry->d_name.len, f, now); | |
627 | if (!ret) { | |
628 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
629 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 630 | drop_nlink(dir_i); |
27c72b04 | 631 | } |
1da177e4 LT |
632 | return ret; |
633 | } | |
634 | ||
265489f0 | 635 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
636 | { |
637 | struct jffs2_inode_info *f, *dir_f; | |
638 | struct jffs2_sb_info *c; | |
639 | struct inode *inode; | |
640 | struct jffs2_raw_inode *ri; | |
641 | struct jffs2_raw_dirent *rd; | |
642 | struct jffs2_full_dnode *fn; | |
643 | struct jffs2_full_dirent *fd; | |
644 | int namelen; | |
aef9ab47 | 645 | union jffs2_device_node dev; |
1da177e4 | 646 | int devlen = 0; |
9fe4854c | 647 | uint32_t alloclen; |
1da177e4 LT |
648 | int ret; |
649 | ||
aef9ab47 | 650 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
651 | return -EINVAL; |
652 | ||
653 | ri = jffs2_alloc_raw_inode(); | |
654 | if (!ri) | |
655 | return -ENOMEM; | |
182ec4ee | 656 | |
1da177e4 | 657 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 658 | |
aef9ab47 DW |
659 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
660 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
661 | |
662 | /* Try to reserve enough space for both node and dirent. | |
663 | * Just the node will do for now, though | |
1da177e4 LT |
664 | */ |
665 | namelen = dentry->d_name.len; | |
9fe4854c | 666 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 667 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
668 | |
669 | if (ret) { | |
670 | jffs2_free_raw_inode(ri); | |
671 | return ret; | |
672 | } | |
673 | ||
cfc8dc6f | 674 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
675 | |
676 | if (IS_ERR(inode)) { | |
677 | jffs2_free_raw_inode(ri); | |
678 | jffs2_complete_reservation(c); | |
679 | return PTR_ERR(inode); | |
680 | } | |
681 | inode->i_op = &jffs2_file_inode_operations; | |
682 | init_special_inode(inode, inode->i_mode, rdev); | |
683 | ||
684 | f = JFFS2_INODE_INFO(inode); | |
685 | ||
686 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
687 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
688 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
689 | ||
690 | ri->compr = JFFS2_COMPR_NONE; | |
691 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
692 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 693 | |
9fe4854c | 694 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
695 | |
696 | jffs2_free_raw_inode(ri); | |
697 | ||
698 | if (IS_ERR(fn)) { | |
699 | /* Eeek. Wave bye bye */ | |
ced22070 | 700 | mutex_unlock(&f->sem); |
1da177e4 | 701 | jffs2_complete_reservation(c); |
f324e4cb DW |
702 | ret = PTR_ERR(fn); |
703 | goto fail; | |
1da177e4 | 704 | } |
182ec4ee | 705 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
706 | obsoleted by the first data write |
707 | */ | |
708 | f->metadata = fn; | |
ced22070 | 709 | mutex_unlock(&f->sem); |
1da177e4 LT |
710 | |
711 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
712 | |
713 | ret = jffs2_init_security(inode, dir_i); | |
f324e4cb DW |
714 | if (ret) |
715 | goto fail; | |
716 | ||
cfc8dc6f | 717 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
718 | if (ret) |
719 | goto fail; | |
aa98d7cf | 720 | |
9fe4854c DW |
721 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
722 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
723 | if (ret) |
724 | goto fail; | |
1da177e4 LT |
725 | |
726 | rd = jffs2_alloc_raw_dirent(); | |
727 | if (!rd) { | |
728 | /* Argh. Now we treat it like a normal delete */ | |
729 | jffs2_complete_reservation(c); | |
f324e4cb DW |
730 | ret = -ENOMEM; |
731 | goto fail; | |
1da177e4 LT |
732 | } |
733 | ||
734 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 735 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
736 | |
737 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
738 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
739 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
740 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
741 | ||
742 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
743 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
744 | rd->ino = cpu_to_je32(inode->i_ino); | |
745 | rd->mctime = cpu_to_je32(get_seconds()); | |
746 | rd->nsize = namelen; | |
747 | ||
748 | /* XXX: This is ugly. */ | |
749 | rd->type = (mode & S_IFMT) >> 12; | |
750 | ||
751 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
752 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
753 | ||
9fe4854c | 754 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 755 | |
1da177e4 | 756 | if (IS_ERR(fd)) { |
182ec4ee | 757 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
758 | as if it were the final unlink() */ |
759 | jffs2_complete_reservation(c); | |
760 | jffs2_free_raw_dirent(rd); | |
ced22070 | 761 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
762 | ret = PTR_ERR(fd); |
763 | goto fail; | |
1da177e4 LT |
764 | } |
765 | ||
766 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
767 | ||
768 | jffs2_free_raw_dirent(rd); | |
769 | ||
770 | /* Link the fd into the inode's list, obsoleting an old | |
771 | one if necessary. */ | |
772 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
773 | ||
ced22070 | 774 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
775 | jffs2_complete_reservation(c); |
776 | ||
777 | d_instantiate(dentry, inode); | |
e72e6497 | 778 | unlock_new_inode(inode); |
1da177e4 | 779 | return 0; |
f324e4cb DW |
780 | |
781 | fail: | |
782 | make_bad_inode(inode); | |
e72e6497 | 783 | unlock_new_inode(inode); |
f324e4cb DW |
784 | iput(inode); |
785 | return ret; | |
1da177e4 LT |
786 | } |
787 | ||
788 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 789 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
790 | { |
791 | int ret; | |
792 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
793 | struct jffs2_inode_info *victim_f = NULL; | |
794 | uint8_t type; | |
3a69e0cd | 795 | uint32_t now; |
1da177e4 | 796 | |
182ec4ee | 797 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
798 | * file over a directory and vice versa, but if it's a directory, |
799 | * the VFS can't check whether the victim is empty. The filesystem | |
800 | * needs to do that for itself. | |
801 | */ | |
802 | if (new_dentry->d_inode) { | |
803 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
804 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
805 | struct jffs2_full_dirent *fd; | |
806 | ||
ced22070 | 807 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
808 | for (fd = victim_f->dents; fd; fd = fd->next) { |
809 | if (fd->ino) { | |
ced22070 | 810 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
811 | return -ENOTEMPTY; |
812 | } | |
813 | } | |
ced22070 | 814 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
815 | } |
816 | } | |
817 | ||
818 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 819 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
820 | then getting -ENOSPC, is quite bad :) |
821 | */ | |
822 | ||
823 | /* Make a hard link */ | |
182ec4ee | 824 | |
1da177e4 LT |
825 | /* XXX: This is ugly */ |
826 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
827 | if (!type) type = DT_REG; | |
828 | ||
3a69e0cd | 829 | now = get_seconds(); |
182ec4ee | 830 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 831 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 832 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
833 | |
834 | if (ret) | |
835 | return ret; | |
836 | ||
837 | if (victim_f) { | |
838 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 839 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
840 | /* Don't oops if the victim was a dirent pointing to an |
841 | inode which didn't exist. */ | |
842 | if (victim_f->inocache) { | |
ced22070 | 843 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
844 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
845 | victim_f->inocache->pino_nlink = 0; | |
846 | else | |
847 | victim_f->inocache->pino_nlink--; | |
ced22070 | 848 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
849 | } |
850 | } | |
851 | ||
182ec4ee | 852 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
853 | increase i_nlink on its new parent */ |
854 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 855 | inc_nlink(new_dir_i); |
1da177e4 LT |
856 | |
857 | /* Unlink the original */ | |
182ec4ee | 858 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 859 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
860 | |
861 | /* We don't touch inode->i_nlink */ | |
862 | ||
863 | if (ret) { | |
864 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
865 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 866 | mutex_lock(&f->sem); |
d8c76e6f | 867 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
868 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
869 | f->inocache->pino_nlink++; | |
ced22070 | 870 | mutex_unlock(&f->sem); |
1da177e4 LT |
871 | |
872 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
873 | /* Might as well let the VFS know */ | |
874 | d_instantiate(new_dentry, old_dentry->d_inode); | |
875 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 876 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
877 | return ret; |
878 | } | |
879 | ||
880 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 881 | drop_nlink(old_dir_i); |
1da177e4 | 882 | |
3a69e0cd AB |
883 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
884 | ||
1da177e4 LT |
885 | return 0; |
886 | } | |
887 |