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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
6088c058 | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * For licensing information, see the file 'LICENCE' in this directory. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
5a528957 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/slab.h> | |
1da177e4 LT |
17 | #include <linux/fs.h> |
18 | #include <linux/crc32.h> | |
19 | #include <linux/jffs2.h> | |
cbb9a561 DW |
20 | #include "jffs2_fs_i.h" |
21 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
22 | #include <linux/time.h> |
23 | #include "nodelist.h" | |
24 | ||
0312fa7c | 25 | static int jffs2_readdir (struct file *, struct dir_context *); |
1da177e4 | 26 | |
4acdaf27 | 27 | static int jffs2_create (struct inode *,struct dentry *,umode_t, |
ebfc3b49 | 28 | bool); |
1da177e4 | 29 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, |
00cd8dd3 | 30 | unsigned int); |
1da177e4 LT |
31 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); |
32 | static int jffs2_unlink (struct inode *,struct dentry *); | |
33 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 34 | static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); |
1da177e4 | 35 | static int jffs2_rmdir (struct inode *,struct dentry *); |
1a67aafb | 36 | static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 37 | static int jffs2_rename (struct inode *, struct dentry *, |
ef53cb02 | 38 | struct inode *, struct dentry *); |
1da177e4 | 39 | |
4b6f5d20 | 40 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
41 | { |
42 | .read = generic_read_dir, | |
c51da20c | 43 | .iterate_shared=jffs2_readdir, |
0533400b | 44 | .unlocked_ioctl=jffs2_ioctl, |
3222a3e5 CH |
45 | .fsync = jffs2_fsync, |
46 | .llseek = generic_file_llseek, | |
1da177e4 LT |
47 | }; |
48 | ||
49 | ||
92e1d5be | 50 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 51 | { |
265489f0 DW |
52 | .create = jffs2_create, |
53 | .lookup = jffs2_lookup, | |
1da177e4 LT |
54 | .link = jffs2_link, |
55 | .unlink = jffs2_unlink, | |
56 | .symlink = jffs2_symlink, | |
57 | .mkdir = jffs2_mkdir, | |
58 | .rmdir = jffs2_rmdir, | |
59 | .mknod = jffs2_mknod, | |
60 | .rename = jffs2_rename, | |
4e34e719 | 61 | .get_acl = jffs2_get_acl, |
f2963d45 | 62 | .set_acl = jffs2_set_acl, |
1da177e4 | 63 | .setattr = jffs2_setattr, |
aa98d7cf KK |
64 | .setxattr = jffs2_setxattr, |
65 | .getxattr = jffs2_getxattr, | |
66 | .listxattr = jffs2_listxattr, | |
67 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
68 | }; |
69 | ||
70 | /***********************************************************************/ | |
71 | ||
72 | ||
73 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 74 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
75 | nice and simple |
76 | */ | |
77 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
00cd8dd3 | 78 | unsigned int flags) |
1da177e4 LT |
79 | { |
80 | struct jffs2_inode_info *dir_f; | |
1da177e4 LT |
81 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
82 | uint32_t ino = 0; | |
83 | struct inode *inode = NULL; | |
8387ff25 | 84 | unsigned int nhash; |
1da177e4 | 85 | |
9c261b33 | 86 | jffs2_dbg(1, "jffs2_lookup()\n"); |
1da177e4 | 87 | |
373d5e71 RP |
88 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
89 | return ERR_PTR(-ENAMETOOLONG); | |
90 | ||
1da177e4 | 91 | dir_f = JFFS2_INODE_INFO(dir_i); |
1da177e4 | 92 | |
8387ff25 LT |
93 | /* The 'nhash' on the fd_list is not the same as the dentry hash */ |
94 | nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); | |
95 | ||
ced22070 | 96 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
97 | |
98 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
8387ff25 LT |
99 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { |
100 | if (fd_list->nhash == nhash && | |
1da177e4 LT |
101 | (!fd || fd_list->version > fd->version) && |
102 | strlen(fd_list->name) == target->d_name.len && | |
103 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
104 | fd = fd_list; | |
105 | } | |
106 | } | |
107 | if (fd) | |
108 | ino = fd->ino; | |
ced22070 | 109 | mutex_unlock(&dir_f->sem); |
1da177e4 | 110 | if (ino) { |
5451f79f | 111 | inode = jffs2_iget(dir_i->i_sb, ino); |
a9049376 | 112 | if (IS_ERR(inode)) |
da320f05 | 113 | pr_warn("iget() failed for ino #%u\n", ino); |
1da177e4 LT |
114 | } |
115 | ||
8966c5e0 | 116 | return d_splice_alias(inode, target); |
1da177e4 LT |
117 | } |
118 | ||
119 | /***********************************************************************/ | |
120 | ||
121 | ||
0312fa7c | 122 | static int jffs2_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 123 | { |
0312fa7c AV |
124 | struct inode *inode = file_inode(file); |
125 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1da177e4 | 126 | struct jffs2_full_dirent *fd; |
0312fa7c | 127 | unsigned long curofs = 1; |
1da177e4 | 128 | |
0312fa7c | 129 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); |
1da177e4 | 130 | |
0312fa7c AV |
131 | if (!dir_emit_dots(file, ctx)) |
132 | return 0; | |
1da177e4 | 133 | |
ced22070 | 134 | mutex_lock(&f->sem); |
1da177e4 | 135 | for (fd = f->dents; fd; fd = fd->next) { |
1da177e4 | 136 | curofs++; |
0312fa7c AV |
137 | /* First loop: curofs = 2; pos = 2 */ |
138 | if (curofs < ctx->pos) { | |
9c261b33 | 139 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
0312fa7c | 140 | fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
1da177e4 LT |
141 | continue; |
142 | } | |
143 | if (!fd->ino) { | |
9c261b33 JP |
144 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
145 | fd->name); | |
0312fa7c | 146 | ctx->pos++; |
1da177e4 LT |
147 | continue; |
148 | } | |
9c261b33 | 149 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
0312fa7c AV |
150 | (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); |
151 | if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) | |
1da177e4 | 152 | break; |
0312fa7c | 153 | ctx->pos++; |
1da177e4 | 154 | } |
ced22070 | 155 | mutex_unlock(&f->sem); |
1da177e4 LT |
156 | return 0; |
157 | } | |
158 | ||
159 | /***********************************************************************/ | |
160 | ||
161 | ||
4acdaf27 | 162 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
ebfc3b49 | 163 | umode_t mode, bool excl) |
1da177e4 LT |
164 | { |
165 | struct jffs2_raw_inode *ri; | |
166 | struct jffs2_inode_info *f, *dir_f; | |
167 | struct jffs2_sb_info *c; | |
168 | struct inode *inode; | |
169 | int ret; | |
170 | ||
171 | ri = jffs2_alloc_raw_inode(); | |
172 | if (!ri) | |
173 | return -ENOMEM; | |
182ec4ee | 174 | |
1da177e4 LT |
175 | c = JFFS2_SB_INFO(dir_i->i_sb); |
176 | ||
9c261b33 | 177 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 178 | |
cfc8dc6f | 179 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
180 | |
181 | if (IS_ERR(inode)) { | |
9c261b33 | 182 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
183 | jffs2_free_raw_inode(ri); |
184 | return PTR_ERR(inode); | |
185 | } | |
186 | ||
187 | inode->i_op = &jffs2_file_inode_operations; | |
188 | inode->i_fop = &jffs2_file_operations; | |
189 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
190 | inode->i_mapping->nrpages = 0; | |
191 | ||
192 | f = JFFS2_INODE_INFO(inode); | |
193 | dir_f = JFFS2_INODE_INFO(dir_i); | |
194 | ||
590fe34c DW |
195 | /* jffs2_do_create() will want to lock it, _after_ reserving |
196 | space and taking c-alloc_sem. If we keep it locked here, | |
197 | lockdep gets unhappy (although it's a false positive; | |
198 | nothing else will be looking at this inode yet so there's | |
199 | no chance of AB-BA deadlock involving its f->sem). */ | |
200 | mutex_unlock(&f->sem); | |
201 | ||
2a7dba39 | 202 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
203 | if (ret) |
204 | goto fail; | |
1da177e4 LT |
205 | |
206 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
207 | ||
208 | jffs2_free_raw_inode(ri); | |
1da177e4 | 209 | |
9c261b33 JP |
210 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
211 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
212 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 | 213 | |
e72e6497 | 214 | unlock_new_inode(inode); |
8fc37ec5 | 215 | d_instantiate(dentry, inode); |
1da177e4 | 216 | return 0; |
aa98d7cf KK |
217 | |
218 | fail: | |
41cce647 | 219 | iget_failed(inode); |
aa98d7cf KK |
220 | jffs2_free_raw_inode(ri); |
221 | return ret; | |
1da177e4 LT |
222 | } |
223 | ||
224 | /***********************************************************************/ | |
225 | ||
226 | ||
227 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
228 | { | |
229 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
230 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
2b0143b5 | 231 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); |
1da177e4 | 232 | int ret; |
3a69e0cd | 233 | uint32_t now = get_seconds(); |
1da177e4 | 234 | |
182ec4ee | 235 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 236 | dentry->d_name.len, dead_f, now); |
1da177e4 | 237 | if (dead_f->inocache) |
2b0143b5 | 238 | set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); |
3a69e0cd AB |
239 | if (!ret) |
240 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
241 | return ret; |
242 | } | |
243 | /***********************************************************************/ | |
244 | ||
245 | ||
246 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
247 | { | |
fc64005c | 248 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); |
2b0143b5 | 249 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
1da177e4 LT |
250 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
251 | int ret; | |
252 | uint8_t type; | |
3a69e0cd | 253 | uint32_t now; |
1da177e4 LT |
254 | |
255 | /* Don't let people make hard links to bad inodes. */ | |
256 | if (!f->inocache) | |
257 | return -EIO; | |
258 | ||
e36cb0b8 | 259 | if (d_is_dir(old_dentry)) |
1da177e4 LT |
260 | return -EPERM; |
261 | ||
262 | /* XXX: This is ugly */ | |
2b0143b5 | 263 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
1da177e4 LT |
264 | if (!type) type = DT_REG; |
265 | ||
3a69e0cd AB |
266 | now = get_seconds(); |
267 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
268 | |
269 | if (!ret) { | |
ced22070 | 270 | mutex_lock(&f->sem); |
2b0143b5 | 271 | set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); |
ced22070 | 272 | mutex_unlock(&f->sem); |
2b0143b5 | 273 | d_instantiate(dentry, d_inode(old_dentry)); |
3a69e0cd | 274 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
2b0143b5 | 275 | ihold(d_inode(old_dentry)); |
1da177e4 LT |
276 | } |
277 | return ret; | |
278 | } | |
279 | ||
280 | /***********************************************************************/ | |
281 | ||
282 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
283 | { | |
284 | struct jffs2_inode_info *f, *dir_f; | |
285 | struct jffs2_sb_info *c; | |
286 | struct inode *inode; | |
287 | struct jffs2_raw_inode *ri; | |
288 | struct jffs2_raw_dirent *rd; | |
289 | struct jffs2_full_dnode *fn; | |
290 | struct jffs2_full_dirent *fd; | |
291 | int namelen; | |
9fe4854c | 292 | uint32_t alloclen; |
32f1a95d | 293 | int ret, targetlen = strlen(target); |
1da177e4 LT |
294 | |
295 | /* FIXME: If you care. We'd need to use frags for the target | |
296 | if it grows much more than this */ | |
32f1a95d | 297 | if (targetlen > 254) |
bde86fec | 298 | return -ENAMETOOLONG; |
1da177e4 LT |
299 | |
300 | ri = jffs2_alloc_raw_inode(); | |
301 | ||
302 | if (!ri) | |
303 | return -ENOMEM; | |
182ec4ee | 304 | |
1da177e4 | 305 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
306 | |
307 | /* Try to reserve enough space for both node and dirent. | |
308 | * Just the node will do for now, though | |
1da177e4 LT |
309 | */ |
310 | namelen = dentry->d_name.len; | |
9fe4854c DW |
311 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
312 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
313 | |
314 | if (ret) { | |
315 | jffs2_free_raw_inode(ri); | |
316 | return ret; | |
317 | } | |
318 | ||
cfc8dc6f | 319 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
320 | |
321 | if (IS_ERR(inode)) { | |
322 | jffs2_free_raw_inode(ri); | |
323 | jffs2_complete_reservation(c); | |
324 | return PTR_ERR(inode); | |
325 | } | |
326 | ||
327 | inode->i_op = &jffs2_symlink_inode_operations; | |
328 | ||
329 | f = JFFS2_INODE_INFO(inode); | |
330 | ||
32f1a95d | 331 | inode->i_size = targetlen; |
1da177e4 LT |
332 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
333 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
334 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
335 | ||
336 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 337 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 338 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 339 | |
9fe4854c | 340 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
341 | |
342 | jffs2_free_raw_inode(ri); | |
343 | ||
344 | if (IS_ERR(fn)) { | |
345 | /* Eeek. Wave bye bye */ | |
ced22070 | 346 | mutex_unlock(&f->sem); |
1da177e4 | 347 | jffs2_complete_reservation(c); |
f324e4cb DW |
348 | ret = PTR_ERR(fn); |
349 | goto fail; | |
1da177e4 | 350 | } |
32f1a95d | 351 | |
2b79adcc | 352 | /* We use f->target field to store the target path. */ |
04aadf36 | 353 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 354 | if (!f->target) { |
da320f05 | 355 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 356 | mutex_unlock(&f->sem); |
32f1a95d | 357 | jffs2_complete_reservation(c); |
f324e4cb DW |
358 | ret = -ENOMEM; |
359 | goto fail; | |
32f1a95d | 360 | } |
a8db149f | 361 | inode->i_link = f->target; |
32f1a95d | 362 | |
9c261b33 JP |
363 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
364 | __func__, (char *)f->target); | |
32f1a95d | 365 | |
182ec4ee | 366 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
367 | obsoleted by the first data write |
368 | */ | |
369 | f->metadata = fn; | |
ced22070 | 370 | mutex_unlock(&f->sem); |
1da177e4 LT |
371 | |
372 | jffs2_complete_reservation(c); | |
aa98d7cf | 373 | |
2a7dba39 | 374 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
375 | if (ret) |
376 | goto fail; | |
377 | ||
cfc8dc6f | 378 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
379 | if (ret) |
380 | goto fail; | |
aa98d7cf | 381 | |
9fe4854c DW |
382 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
383 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
384 | if (ret) |
385 | goto fail; | |
1da177e4 LT |
386 | |
387 | rd = jffs2_alloc_raw_dirent(); | |
388 | if (!rd) { | |
389 | /* Argh. Now we treat it like a normal delete */ | |
390 | jffs2_complete_reservation(c); | |
f324e4cb DW |
391 | ret = -ENOMEM; |
392 | goto fail; | |
1da177e4 LT |
393 | } |
394 | ||
395 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 396 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
397 | |
398 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
399 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
400 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
401 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
402 | ||
403 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
404 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
405 | rd->ino = cpu_to_je32(inode->i_ino); | |
406 | rd->mctime = cpu_to_je32(get_seconds()); | |
407 | rd->nsize = namelen; | |
408 | rd->type = DT_LNK; | |
409 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
410 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
411 | ||
9fe4854c | 412 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
413 | |
414 | if (IS_ERR(fd)) { | |
182ec4ee | 415 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
416 | as if it were the final unlink() */ |
417 | jffs2_complete_reservation(c); | |
418 | jffs2_free_raw_dirent(rd); | |
ced22070 | 419 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
420 | ret = PTR_ERR(fd); |
421 | goto fail; | |
1da177e4 LT |
422 | } |
423 | ||
424 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
425 | ||
426 | jffs2_free_raw_dirent(rd); | |
427 | ||
428 | /* Link the fd into the inode's list, obsoleting an old | |
429 | one if necessary. */ | |
430 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
431 | ||
ced22070 | 432 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
433 | jffs2_complete_reservation(c); |
434 | ||
e72e6497 | 435 | unlock_new_inode(inode); |
8fc37ec5 | 436 | d_instantiate(dentry, inode); |
1da177e4 | 437 | return 0; |
f324e4cb DW |
438 | |
439 | fail: | |
41cce647 | 440 | iget_failed(inode); |
f324e4cb | 441 | return ret; |
1da177e4 LT |
442 | } |
443 | ||
444 | ||
18bb1db3 | 445 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
446 | { |
447 | struct jffs2_inode_info *f, *dir_f; | |
448 | struct jffs2_sb_info *c; | |
449 | struct inode *inode; | |
450 | struct jffs2_raw_inode *ri; | |
451 | struct jffs2_raw_dirent *rd; | |
452 | struct jffs2_full_dnode *fn; | |
453 | struct jffs2_full_dirent *fd; | |
454 | int namelen; | |
9fe4854c | 455 | uint32_t alloclen; |
1da177e4 LT |
456 | int ret; |
457 | ||
458 | mode |= S_IFDIR; | |
459 | ||
460 | ri = jffs2_alloc_raw_inode(); | |
461 | if (!ri) | |
462 | return -ENOMEM; | |
182ec4ee | 463 | |
1da177e4 LT |
464 | c = JFFS2_SB_INFO(dir_i->i_sb); |
465 | ||
182ec4ee TG |
466 | /* Try to reserve enough space for both node and dirent. |
467 | * Just the node will do for now, though | |
1da177e4 LT |
468 | */ |
469 | namelen = dentry->d_name.len; | |
9fe4854c DW |
470 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
471 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
472 | |
473 | if (ret) { | |
474 | jffs2_free_raw_inode(ri); | |
475 | return ret; | |
476 | } | |
477 | ||
cfc8dc6f | 478 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
479 | |
480 | if (IS_ERR(inode)) { | |
481 | jffs2_free_raw_inode(ri); | |
482 | jffs2_complete_reservation(c); | |
483 | return PTR_ERR(inode); | |
484 | } | |
485 | ||
486 | inode->i_op = &jffs2_dir_inode_operations; | |
487 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
488 | |
489 | f = JFFS2_INODE_INFO(inode); | |
490 | ||
27c72b04 | 491 | /* Directories get nlink 2 at start */ |
bfe86848 | 492 | set_nlink(inode, 2); |
27c72b04 DW |
493 | /* but ic->pino_nlink is the parent ino# */ |
494 | f->inocache->pino_nlink = dir_i->i_ino; | |
495 | ||
1da177e4 LT |
496 | ri->data_crc = cpu_to_je32(0); |
497 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 498 | |
9fe4854c | 499 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
500 | |
501 | jffs2_free_raw_inode(ri); | |
502 | ||
503 | if (IS_ERR(fn)) { | |
504 | /* Eeek. Wave bye bye */ | |
ced22070 | 505 | mutex_unlock(&f->sem); |
1da177e4 | 506 | jffs2_complete_reservation(c); |
f324e4cb DW |
507 | ret = PTR_ERR(fn); |
508 | goto fail; | |
1da177e4 | 509 | } |
182ec4ee | 510 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
511 | obsoleted by the first data write |
512 | */ | |
513 | f->metadata = fn; | |
ced22070 | 514 | mutex_unlock(&f->sem); |
1da177e4 LT |
515 | |
516 | jffs2_complete_reservation(c); | |
aa98d7cf | 517 | |
2a7dba39 | 518 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
519 | if (ret) |
520 | goto fail; | |
521 | ||
cfc8dc6f | 522 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
523 | if (ret) |
524 | goto fail; | |
aa98d7cf | 525 | |
9fe4854c DW |
526 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
527 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
528 | if (ret) |
529 | goto fail; | |
182ec4ee | 530 | |
1da177e4 LT |
531 | rd = jffs2_alloc_raw_dirent(); |
532 | if (!rd) { | |
533 | /* Argh. Now we treat it like a normal delete */ | |
534 | jffs2_complete_reservation(c); | |
f324e4cb DW |
535 | ret = -ENOMEM; |
536 | goto fail; | |
1da177e4 LT |
537 | } |
538 | ||
539 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 540 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
541 | |
542 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
543 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
544 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
545 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
546 | ||
547 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
548 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
549 | rd->ino = cpu_to_je32(inode->i_ino); | |
550 | rd->mctime = cpu_to_je32(get_seconds()); | |
551 | rd->nsize = namelen; | |
552 | rd->type = DT_DIR; | |
553 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
554 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
555 | ||
9fe4854c | 556 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 557 | |
1da177e4 | 558 | if (IS_ERR(fd)) { |
182ec4ee | 559 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
560 | as if it were the final unlink() */ |
561 | jffs2_complete_reservation(c); | |
562 | jffs2_free_raw_dirent(rd); | |
ced22070 | 563 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
564 | ret = PTR_ERR(fd); |
565 | goto fail; | |
1da177e4 LT |
566 | } |
567 | ||
568 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 569 | inc_nlink(dir_i); |
1da177e4 LT |
570 | |
571 | jffs2_free_raw_dirent(rd); | |
572 | ||
573 | /* Link the fd into the inode's list, obsoleting an old | |
574 | one if necessary. */ | |
575 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
576 | ||
ced22070 | 577 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
578 | jffs2_complete_reservation(c); |
579 | ||
e72e6497 | 580 | unlock_new_inode(inode); |
8fc37ec5 | 581 | d_instantiate(dentry, inode); |
1da177e4 | 582 | return 0; |
f324e4cb DW |
583 | |
584 | fail: | |
41cce647 | 585 | iget_failed(inode); |
f324e4cb | 586 | return ret; |
1da177e4 LT |
587 | } |
588 | ||
589 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
590 | { | |
27c72b04 DW |
591 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
592 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
2b0143b5 | 593 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); |
1da177e4 LT |
594 | struct jffs2_full_dirent *fd; |
595 | int ret; | |
27c72b04 | 596 | uint32_t now = get_seconds(); |
1da177e4 LT |
597 | |
598 | for (fd = f->dents ; fd; fd = fd->next) { | |
599 | if (fd->ino) | |
600 | return -ENOTEMPTY; | |
601 | } | |
27c72b04 DW |
602 | |
603 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
604 | dentry->d_name.len, f, now); | |
605 | if (!ret) { | |
606 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
2b0143b5 | 607 | clear_nlink(d_inode(dentry)); |
9a53c3a7 | 608 | drop_nlink(dir_i); |
27c72b04 | 609 | } |
1da177e4 LT |
610 | return ret; |
611 | } | |
612 | ||
1a67aafb | 613 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
614 | { |
615 | struct jffs2_inode_info *f, *dir_f; | |
616 | struct jffs2_sb_info *c; | |
617 | struct inode *inode; | |
618 | struct jffs2_raw_inode *ri; | |
619 | struct jffs2_raw_dirent *rd; | |
620 | struct jffs2_full_dnode *fn; | |
621 | struct jffs2_full_dirent *fd; | |
622 | int namelen; | |
aef9ab47 | 623 | union jffs2_device_node dev; |
1da177e4 | 624 | int devlen = 0; |
9fe4854c | 625 | uint32_t alloclen; |
1da177e4 LT |
626 | int ret; |
627 | ||
1da177e4 LT |
628 | ri = jffs2_alloc_raw_inode(); |
629 | if (!ri) | |
630 | return -ENOMEM; | |
182ec4ee | 631 | |
1da177e4 | 632 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 633 | |
aef9ab47 DW |
634 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
635 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
636 | |
637 | /* Try to reserve enough space for both node and dirent. | |
638 | * Just the node will do for now, though | |
1da177e4 LT |
639 | */ |
640 | namelen = dentry->d_name.len; | |
9fe4854c | 641 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 642 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
643 | |
644 | if (ret) { | |
645 | jffs2_free_raw_inode(ri); | |
646 | return ret; | |
647 | } | |
648 | ||
cfc8dc6f | 649 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
650 | |
651 | if (IS_ERR(inode)) { | |
652 | jffs2_free_raw_inode(ri); | |
653 | jffs2_complete_reservation(c); | |
654 | return PTR_ERR(inode); | |
655 | } | |
656 | inode->i_op = &jffs2_file_inode_operations; | |
657 | init_special_inode(inode, inode->i_mode, rdev); | |
658 | ||
659 | f = JFFS2_INODE_INFO(inode); | |
660 | ||
661 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
662 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
663 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
664 | ||
665 | ri->compr = JFFS2_COMPR_NONE; | |
666 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
667 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 668 | |
9fe4854c | 669 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
670 | |
671 | jffs2_free_raw_inode(ri); | |
672 | ||
673 | if (IS_ERR(fn)) { | |
674 | /* Eeek. Wave bye bye */ | |
ced22070 | 675 | mutex_unlock(&f->sem); |
1da177e4 | 676 | jffs2_complete_reservation(c); |
f324e4cb DW |
677 | ret = PTR_ERR(fn); |
678 | goto fail; | |
1da177e4 | 679 | } |
182ec4ee | 680 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
681 | obsoleted by the first data write |
682 | */ | |
683 | f->metadata = fn; | |
ced22070 | 684 | mutex_unlock(&f->sem); |
1da177e4 LT |
685 | |
686 | jffs2_complete_reservation(c); | |
aa98d7cf | 687 | |
2a7dba39 | 688 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
689 | if (ret) |
690 | goto fail; | |
691 | ||
cfc8dc6f | 692 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
693 | if (ret) |
694 | goto fail; | |
aa98d7cf | 695 | |
9fe4854c DW |
696 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
697 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
698 | if (ret) |
699 | goto fail; | |
1da177e4 LT |
700 | |
701 | rd = jffs2_alloc_raw_dirent(); | |
702 | if (!rd) { | |
703 | /* Argh. Now we treat it like a normal delete */ | |
704 | jffs2_complete_reservation(c); | |
f324e4cb DW |
705 | ret = -ENOMEM; |
706 | goto fail; | |
1da177e4 LT |
707 | } |
708 | ||
709 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 710 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
711 | |
712 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
713 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
714 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
715 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
716 | ||
717 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
718 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
719 | rd->ino = cpu_to_je32(inode->i_ino); | |
720 | rd->mctime = cpu_to_je32(get_seconds()); | |
721 | rd->nsize = namelen; | |
722 | ||
723 | /* XXX: This is ugly. */ | |
724 | rd->type = (mode & S_IFMT) >> 12; | |
725 | ||
726 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
727 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
728 | ||
9fe4854c | 729 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 730 | |
1da177e4 | 731 | if (IS_ERR(fd)) { |
182ec4ee | 732 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
733 | as if it were the final unlink() */ |
734 | jffs2_complete_reservation(c); | |
735 | jffs2_free_raw_dirent(rd); | |
ced22070 | 736 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
737 | ret = PTR_ERR(fd); |
738 | goto fail; | |
1da177e4 LT |
739 | } |
740 | ||
741 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
742 | ||
743 | jffs2_free_raw_dirent(rd); | |
744 | ||
745 | /* Link the fd into the inode's list, obsoleting an old | |
746 | one if necessary. */ | |
747 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
748 | ||
ced22070 | 749 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
750 | jffs2_complete_reservation(c); |
751 | ||
e72e6497 | 752 | unlock_new_inode(inode); |
8fc37ec5 | 753 | d_instantiate(dentry, inode); |
1da177e4 | 754 | return 0; |
f324e4cb DW |
755 | |
756 | fail: | |
41cce647 | 757 | iget_failed(inode); |
f324e4cb | 758 | return ret; |
1da177e4 LT |
759 | } |
760 | ||
761 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 762 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
763 | { |
764 | int ret; | |
765 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
766 | struct jffs2_inode_info *victim_f = NULL; | |
767 | uint8_t type; | |
3a69e0cd | 768 | uint32_t now; |
1da177e4 | 769 | |
182ec4ee | 770 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
771 | * file over a directory and vice versa, but if it's a directory, |
772 | * the VFS can't check whether the victim is empty. The filesystem | |
773 | * needs to do that for itself. | |
774 | */ | |
2b0143b5 DH |
775 | if (d_really_is_positive(new_dentry)) { |
776 | victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); | |
e36cb0b8 | 777 | if (d_is_dir(new_dentry)) { |
1da177e4 LT |
778 | struct jffs2_full_dirent *fd; |
779 | ||
ced22070 | 780 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
781 | for (fd = victim_f->dents; fd; fd = fd->next) { |
782 | if (fd->ino) { | |
ced22070 | 783 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
784 | return -ENOTEMPTY; |
785 | } | |
786 | } | |
ced22070 | 787 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
788 | } |
789 | } | |
790 | ||
791 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 792 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
793 | then getting -ENOSPC, is quite bad :) |
794 | */ | |
795 | ||
796 | /* Make a hard link */ | |
182ec4ee | 797 | |
1da177e4 | 798 | /* XXX: This is ugly */ |
2b0143b5 | 799 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
1da177e4 LT |
800 | if (!type) type = DT_REG; |
801 | ||
3a69e0cd | 802 | now = get_seconds(); |
182ec4ee | 803 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
2b0143b5 | 804 | d_inode(old_dentry)->i_ino, type, |
3a69e0cd | 805 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
806 | |
807 | if (ret) | |
808 | return ret; | |
809 | ||
810 | if (victim_f) { | |
811 | /* There was a victim. Kill it off nicely */ | |
e36cb0b8 | 812 | if (d_is_dir(new_dentry)) |
2b0143b5 | 813 | clear_nlink(d_inode(new_dentry)); |
22ba747f | 814 | else |
2b0143b5 | 815 | drop_nlink(d_inode(new_dentry)); |
1da177e4 LT |
816 | /* Don't oops if the victim was a dirent pointing to an |
817 | inode which didn't exist. */ | |
818 | if (victim_f->inocache) { | |
ced22070 | 819 | mutex_lock(&victim_f->sem); |
e36cb0b8 | 820 | if (d_is_dir(new_dentry)) |
27c72b04 DW |
821 | victim_f->inocache->pino_nlink = 0; |
822 | else | |
823 | victim_f->inocache->pino_nlink--; | |
ced22070 | 824 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
825 | } |
826 | } | |
827 | ||
182ec4ee | 828 | /* If it was a directory we moved, and there was no victim, |
1da177e4 | 829 | increase i_nlink on its new parent */ |
e36cb0b8 | 830 | if (d_is_dir(old_dentry) && !victim_f) |
d8c76e6f | 831 | inc_nlink(new_dir_i); |
1da177e4 LT |
832 | |
833 | /* Unlink the original */ | |
182ec4ee | 834 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 835 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
836 | |
837 | /* We don't touch inode->i_nlink */ | |
838 | ||
839 | if (ret) { | |
840 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
2b0143b5 | 841 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
ced22070 | 842 | mutex_lock(&f->sem); |
2b0143b5 | 843 | inc_nlink(d_inode(old_dentry)); |
e36cb0b8 | 844 | if (f->inocache && !d_is_dir(old_dentry)) |
27c72b04 | 845 | f->inocache->pino_nlink++; |
ced22070 | 846 | mutex_unlock(&f->sem); |
1da177e4 | 847 | |
da320f05 JP |
848 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
849 | __func__, ret); | |
f9381284 AV |
850 | /* |
851 | * We can't keep the target in dcache after that. | |
852 | * For one thing, we can't afford dentry aliases for directories. | |
853 | * For another, if there was a victim, we _can't_ set new inode | |
854 | * for that sucker and we have to trigger mount eviction - the | |
855 | * caller won't do it on its own since we are returning an error. | |
856 | */ | |
857 | d_invalidate(new_dentry); | |
3a69e0cd | 858 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
859 | return ret; |
860 | } | |
861 | ||
e36cb0b8 | 862 | if (d_is_dir(old_dentry)) |
9a53c3a7 | 863 | drop_nlink(old_dir_i); |
1da177e4 | 864 | |
3a69e0cd AB |
865 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
866 | ||
1da177e4 LT |
867 | return 0; |
868 | } | |
869 |