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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. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
1da177e4 LT |
14 | #include <linux/fs.h> |
15 | #include <linux/crc32.h> | |
16 | #include <linux/jffs2.h> | |
cbb9a561 DW |
17 | #include "jffs2_fs_i.h" |
18 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
19 | #include <linux/time.h> |
20 | #include "nodelist.h" | |
21 | ||
1da177e4 LT |
22 | static int jffs2_readdir (struct file *, void *, filldir_t); |
23 | ||
24 | static int jffs2_create (struct inode *,struct dentry *,int, | |
25 | struct nameidata *); | |
26 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, | |
27 | struct nameidata *); | |
28 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); | |
29 | static int jffs2_unlink (struct inode *,struct dentry *); | |
30 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
31 | static int jffs2_mkdir (struct inode *,struct dentry *,int); | |
32 | static int jffs2_rmdir (struct inode *,struct dentry *); | |
265489f0 | 33 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
1da177e4 | 34 | static int jffs2_rename (struct inode *, struct dentry *, |
ef53cb02 | 35 | struct inode *, struct dentry *); |
1da177e4 | 36 | |
4b6f5d20 | 37 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
38 | { |
39 | .read = generic_read_dir, | |
40 | .readdir = jffs2_readdir, | |
0533400b | 41 | .unlocked_ioctl=jffs2_ioctl, |
3222a3e5 CH |
42 | .fsync = jffs2_fsync, |
43 | .llseek = generic_file_llseek, | |
1da177e4 LT |
44 | }; |
45 | ||
46 | ||
92e1d5be | 47 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 48 | { |
265489f0 DW |
49 | .create = jffs2_create, |
50 | .lookup = jffs2_lookup, | |
1da177e4 LT |
51 | .link = jffs2_link, |
52 | .unlink = jffs2_unlink, | |
53 | .symlink = jffs2_symlink, | |
54 | .mkdir = jffs2_mkdir, | |
55 | .rmdir = jffs2_rmdir, | |
56 | .mknod = jffs2_mknod, | |
57 | .rename = jffs2_rename, | |
18f4c644 | 58 | .check_acl = jffs2_check_acl, |
1da177e4 | 59 | .setattr = jffs2_setattr, |
aa98d7cf KK |
60 | .setxattr = jffs2_setxattr, |
61 | .getxattr = jffs2_getxattr, | |
62 | .listxattr = jffs2_listxattr, | |
63 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
64 | }; |
65 | ||
66 | /***********************************************************************/ | |
67 | ||
68 | ||
69 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 70 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
71 | nice and simple |
72 | */ | |
73 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
74 | struct nameidata *nd) | |
75 | { | |
76 | struct jffs2_inode_info *dir_f; | |
77 | struct jffs2_sb_info *c; | |
78 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
79 | uint32_t ino = 0; | |
80 | struct inode *inode = NULL; | |
81 | ||
82 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
83 | ||
373d5e71 RP |
84 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
85 | return ERR_PTR(-ENAMETOOLONG); | |
86 | ||
1da177e4 LT |
87 | dir_f = JFFS2_INODE_INFO(dir_i); |
88 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
89 | ||
ced22070 | 90 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
91 | |
92 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
93 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 94 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
95 | (!fd || fd_list->version > fd->version) && |
96 | strlen(fd_list->name) == target->d_name.len && | |
97 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
98 | fd = fd_list; | |
99 | } | |
100 | } | |
101 | if (fd) | |
102 | ino = fd->ino; | |
ced22070 | 103 | mutex_unlock(&dir_f->sem); |
1da177e4 | 104 | if (ino) { |
5451f79f DH |
105 | inode = jffs2_iget(dir_i->i_sb, ino); |
106 | if (IS_ERR(inode)) { | |
1da177e4 | 107 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); |
5451f79f | 108 | return ERR_CAST(inode); |
1da177e4 LT |
109 | } |
110 | } | |
111 | ||
8966c5e0 | 112 | return d_splice_alias(inode, target); |
1da177e4 LT |
113 | } |
114 | ||
115 | /***********************************************************************/ | |
116 | ||
117 | ||
118 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
119 | { | |
120 | struct jffs2_inode_info *f; | |
121 | struct jffs2_sb_info *c; | |
ec2e203c | 122 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
123 | struct jffs2_full_dirent *fd; |
124 | unsigned long offset, curofs; | |
125 | ||
ec2e203c | 126 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
127 | |
128 | f = JFFS2_INODE_INFO(inode); | |
129 | c = JFFS2_SB_INFO(inode->i_sb); | |
130 | ||
131 | offset = filp->f_pos; | |
132 | ||
133 | if (offset == 0) { | |
134 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
135 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
136 | goto out; | |
137 | offset++; | |
138 | } | |
139 | if (offset == 1) { | |
ec2e203c | 140 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
141 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
142 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
143 | goto out; | |
144 | offset++; | |
145 | } | |
146 | ||
147 | curofs=1; | |
ced22070 | 148 | mutex_lock(&f->sem); |
1da177e4 LT |
149 | for (fd = f->dents; fd; fd = fd->next) { |
150 | ||
151 | curofs++; | |
152 | /* First loop: curofs = 2; offset = 2 */ | |
153 | if (curofs < offset) { | |
182ec4ee | 154 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
155 | fd->name, fd->ino, fd->type, curofs, offset)); |
156 | continue; | |
157 | } | |
158 | if (!fd->ino) { | |
159 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
160 | offset++; | |
161 | continue; | |
162 | } | |
163 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
164 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
165 | break; | |
166 | offset++; | |
167 | } | |
ced22070 | 168 | mutex_unlock(&f->sem); |
1da177e4 LT |
169 | out: |
170 | filp->f_pos = offset; | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /***********************************************************************/ | |
175 | ||
176 | ||
177 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
178 | struct nameidata *nd) | |
179 | { | |
180 | struct jffs2_raw_inode *ri; | |
181 | struct jffs2_inode_info *f, *dir_f; | |
182 | struct jffs2_sb_info *c; | |
183 | struct inode *inode; | |
184 | int ret; | |
185 | ||
186 | ri = jffs2_alloc_raw_inode(); | |
187 | if (!ri) | |
188 | return -ENOMEM; | |
182ec4ee | 189 | |
1da177e4 LT |
190 | c = JFFS2_SB_INFO(dir_i->i_sb); |
191 | ||
192 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
193 | ||
cfc8dc6f | 194 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
195 | |
196 | if (IS_ERR(inode)) { | |
197 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
198 | jffs2_free_raw_inode(ri); | |
199 | return PTR_ERR(inode); | |
200 | } | |
201 | ||
202 | inode->i_op = &jffs2_file_inode_operations; | |
203 | inode->i_fop = &jffs2_file_operations; | |
204 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
205 | inode->i_mapping->nrpages = 0; | |
206 | ||
207 | f = JFFS2_INODE_INFO(inode); | |
208 | dir_f = JFFS2_INODE_INFO(dir_i); | |
209 | ||
590fe34c DW |
210 | /* jffs2_do_create() will want to lock it, _after_ reserving |
211 | space and taking c-alloc_sem. If we keep it locked here, | |
212 | lockdep gets unhappy (although it's a false positive; | |
213 | nothing else will be looking at this inode yet so there's | |
214 | no chance of AB-BA deadlock involving its f->sem). */ | |
215 | mutex_unlock(&f->sem); | |
216 | ||
182ec4ee | 217 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 | 218 | dentry->d_name.name, dentry->d_name.len); |
aa98d7cf KK |
219 | if (ret) |
220 | goto fail; | |
1da177e4 LT |
221 | |
222 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
223 | ||
224 | jffs2_free_raw_inode(ri); | |
225 | d_instantiate(dentry, inode); | |
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)); | |
1da177e4 | 230 | return 0; |
aa98d7cf KK |
231 | |
232 | fail: | |
233 | make_bad_inode(inode); | |
234 | iput(inode); | |
235 | jffs2_free_raw_inode(ri); | |
236 | return ret; | |
1da177e4 LT |
237 | } |
238 | ||
239 | /***********************************************************************/ | |
240 | ||
241 | ||
242 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
243 | { | |
244 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
245 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
246 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
247 | int ret; | |
3a69e0cd | 248 | uint32_t now = get_seconds(); |
1da177e4 | 249 | |
182ec4ee | 250 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 251 | dentry->d_name.len, dead_f, now); |
1da177e4 | 252 | if (dead_f->inocache) |
27c72b04 | 253 | dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; |
3a69e0cd AB |
254 | if (!ret) |
255 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
256 | return ret; |
257 | } | |
258 | /***********************************************************************/ | |
259 | ||
260 | ||
261 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
262 | { | |
263 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
264 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
265 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
266 | int ret; | |
267 | uint8_t type; | |
3a69e0cd | 268 | uint32_t now; |
1da177e4 LT |
269 | |
270 | /* Don't let people make hard links to bad inodes. */ | |
271 | if (!f->inocache) | |
272 | return -EIO; | |
273 | ||
274 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
275 | return -EPERM; | |
276 | ||
277 | /* XXX: This is ugly */ | |
278 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
279 | if (!type) type = DT_REG; | |
280 | ||
3a69e0cd AB |
281 | now = get_seconds(); |
282 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
283 | |
284 | if (!ret) { | |
ced22070 | 285 | mutex_lock(&f->sem); |
27c72b04 | 286 | old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; |
ced22070 | 287 | mutex_unlock(&f->sem); |
1da177e4 | 288 | d_instantiate(dentry, old_dentry->d_inode); |
3a69e0cd | 289 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
290 | atomic_inc(&old_dentry->d_inode->i_count); |
291 | } | |
292 | return ret; | |
293 | } | |
294 | ||
295 | /***********************************************************************/ | |
296 | ||
297 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
298 | { | |
299 | struct jffs2_inode_info *f, *dir_f; | |
300 | struct jffs2_sb_info *c; | |
301 | struct inode *inode; | |
302 | struct jffs2_raw_inode *ri; | |
303 | struct jffs2_raw_dirent *rd; | |
304 | struct jffs2_full_dnode *fn; | |
305 | struct jffs2_full_dirent *fd; | |
306 | int namelen; | |
9fe4854c | 307 | uint32_t alloclen; |
32f1a95d | 308 | int ret, targetlen = strlen(target); |
1da177e4 LT |
309 | |
310 | /* FIXME: If you care. We'd need to use frags for the target | |
311 | if it grows much more than this */ | |
32f1a95d | 312 | if (targetlen > 254) |
bde86fec | 313 | return -ENAMETOOLONG; |
1da177e4 LT |
314 | |
315 | ri = jffs2_alloc_raw_inode(); | |
316 | ||
317 | if (!ri) | |
318 | return -ENOMEM; | |
182ec4ee | 319 | |
1da177e4 | 320 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
321 | |
322 | /* Try to reserve enough space for both node and dirent. | |
323 | * Just the node will do for now, though | |
1da177e4 LT |
324 | */ |
325 | namelen = dentry->d_name.len; | |
9fe4854c DW |
326 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
327 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
328 | |
329 | if (ret) { | |
330 | jffs2_free_raw_inode(ri); | |
331 | return ret; | |
332 | } | |
333 | ||
cfc8dc6f | 334 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
335 | |
336 | if (IS_ERR(inode)) { | |
337 | jffs2_free_raw_inode(ri); | |
338 | jffs2_complete_reservation(c); | |
339 | return PTR_ERR(inode); | |
340 | } | |
341 | ||
342 | inode->i_op = &jffs2_symlink_inode_operations; | |
343 | ||
344 | f = JFFS2_INODE_INFO(inode); | |
345 | ||
32f1a95d | 346 | inode->i_size = targetlen; |
1da177e4 LT |
347 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
348 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
349 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
350 | ||
351 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 352 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 353 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 354 | |
9fe4854c | 355 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
356 | |
357 | jffs2_free_raw_inode(ri); | |
358 | ||
359 | if (IS_ERR(fn)) { | |
360 | /* Eeek. Wave bye bye */ | |
ced22070 | 361 | mutex_unlock(&f->sem); |
1da177e4 LT |
362 | jffs2_complete_reservation(c); |
363 | jffs2_clear_inode(inode); | |
364 | return PTR_ERR(fn); | |
365 | } | |
32f1a95d | 366 | |
2b79adcc AB |
367 | /* We use f->target field to store the target path. */ |
368 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); | |
369 | if (!f->target) { | |
32f1a95d | 370 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 371 | mutex_unlock(&f->sem); |
32f1a95d AB |
372 | jffs2_complete_reservation(c); |
373 | jffs2_clear_inode(inode); | |
374 | return -ENOMEM; | |
375 | } | |
376 | ||
2b79adcc AB |
377 | memcpy(f->target, target, targetlen + 1); |
378 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); | |
32f1a95d | 379 | |
182ec4ee | 380 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
381 | obsoleted by the first data write |
382 | */ | |
383 | f->metadata = fn; | |
ced22070 | 384 | mutex_unlock(&f->sem); |
1da177e4 LT |
385 | |
386 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
387 | |
388 | ret = jffs2_init_security(inode, dir_i); | |
389 | if (ret) { | |
390 | jffs2_clear_inode(inode); | |
391 | return ret; | |
392 | } | |
cfc8dc6f | 393 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
394 | if (ret) { |
395 | jffs2_clear_inode(inode); | |
396 | return ret; | |
397 | } | |
398 | ||
9fe4854c DW |
399 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
400 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
401 | if (ret) { |
402 | /* Eep. */ | |
403 | jffs2_clear_inode(inode); | |
404 | return ret; | |
405 | } | |
406 | ||
407 | rd = jffs2_alloc_raw_dirent(); | |
408 | if (!rd) { | |
409 | /* Argh. Now we treat it like a normal delete */ | |
410 | jffs2_complete_reservation(c); | |
411 | jffs2_clear_inode(inode); | |
412 | return -ENOMEM; | |
413 | } | |
414 | ||
415 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 416 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
417 | |
418 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
419 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
420 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
421 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
422 | ||
423 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
424 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
425 | rd->ino = cpu_to_je32(inode->i_ino); | |
426 | rd->mctime = cpu_to_je32(get_seconds()); | |
427 | rd->nsize = namelen; | |
428 | rd->type = DT_LNK; | |
429 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
430 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
431 | ||
9fe4854c | 432 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
433 | |
434 | if (IS_ERR(fd)) { | |
182ec4ee | 435 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
436 | as if it were the final unlink() */ |
437 | jffs2_complete_reservation(c); | |
438 | jffs2_free_raw_dirent(rd); | |
ced22070 | 439 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
440 | jffs2_clear_inode(inode); |
441 | return PTR_ERR(fd); | |
442 | } | |
443 | ||
444 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
445 | ||
446 | jffs2_free_raw_dirent(rd); | |
447 | ||
448 | /* Link the fd into the inode's list, obsoleting an old | |
449 | one if necessary. */ | |
450 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
451 | ||
ced22070 | 452 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
453 | jffs2_complete_reservation(c); |
454 | ||
455 | d_instantiate(dentry, inode); | |
456 | return 0; | |
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 LT |
521 | jffs2_complete_reservation(c); |
522 | jffs2_clear_inode(inode); | |
523 | return PTR_ERR(fn); | |
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); | |
534 | if (ret) { | |
535 | jffs2_clear_inode(inode); | |
536 | return ret; | |
537 | } | |
cfc8dc6f | 538 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
539 | if (ret) { |
540 | jffs2_clear_inode(inode); | |
541 | return ret; | |
542 | } | |
543 | ||
9fe4854c DW |
544 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
545 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
546 | if (ret) { |
547 | /* Eep. */ | |
548 | jffs2_clear_inode(inode); | |
549 | return ret; | |
550 | } | |
182ec4ee | 551 | |
1da177e4 LT |
552 | rd = jffs2_alloc_raw_dirent(); |
553 | if (!rd) { | |
554 | /* Argh. Now we treat it like a normal delete */ | |
555 | jffs2_complete_reservation(c); | |
556 | jffs2_clear_inode(inode); | |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 561 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
562 | |
563 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
564 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
565 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
566 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
567 | ||
568 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
569 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
570 | rd->ino = cpu_to_je32(inode->i_ino); | |
571 | rd->mctime = cpu_to_je32(get_seconds()); | |
572 | rd->nsize = namelen; | |
573 | rd->type = DT_DIR; | |
574 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
575 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
576 | ||
9fe4854c | 577 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 578 | |
1da177e4 | 579 | if (IS_ERR(fd)) { |
182ec4ee | 580 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
581 | as if it were the final unlink() */ |
582 | jffs2_complete_reservation(c); | |
583 | jffs2_free_raw_dirent(rd); | |
ced22070 | 584 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
585 | jffs2_clear_inode(inode); |
586 | return PTR_ERR(fd); | |
587 | } | |
588 | ||
589 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 590 | inc_nlink(dir_i); |
1da177e4 LT |
591 | |
592 | jffs2_free_raw_dirent(rd); | |
593 | ||
594 | /* Link the fd into the inode's list, obsoleting an old | |
595 | one if necessary. */ | |
596 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
597 | ||
ced22070 | 598 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
599 | jffs2_complete_reservation(c); |
600 | ||
601 | d_instantiate(dentry, inode); | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
606 | { | |
27c72b04 DW |
607 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
608 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
1da177e4 LT |
609 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); |
610 | struct jffs2_full_dirent *fd; | |
611 | int ret; | |
27c72b04 | 612 | uint32_t now = get_seconds(); |
1da177e4 LT |
613 | |
614 | for (fd = f->dents ; fd; fd = fd->next) { | |
615 | if (fd->ino) | |
616 | return -ENOTEMPTY; | |
617 | } | |
27c72b04 DW |
618 | |
619 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
620 | dentry->d_name.len, f, now); | |
621 | if (!ret) { | |
622 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
623 | clear_nlink(dentry->d_inode); | |
9a53c3a7 | 624 | drop_nlink(dir_i); |
27c72b04 | 625 | } |
1da177e4 LT |
626 | return ret; |
627 | } | |
628 | ||
265489f0 | 629 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
630 | { |
631 | struct jffs2_inode_info *f, *dir_f; | |
632 | struct jffs2_sb_info *c; | |
633 | struct inode *inode; | |
634 | struct jffs2_raw_inode *ri; | |
635 | struct jffs2_raw_dirent *rd; | |
636 | struct jffs2_full_dnode *fn; | |
637 | struct jffs2_full_dirent *fd; | |
638 | int namelen; | |
aef9ab47 | 639 | union jffs2_device_node dev; |
1da177e4 | 640 | int devlen = 0; |
9fe4854c | 641 | uint32_t alloclen; |
1da177e4 LT |
642 | int ret; |
643 | ||
aef9ab47 | 644 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
645 | return -EINVAL; |
646 | ||
647 | ri = jffs2_alloc_raw_inode(); | |
648 | if (!ri) | |
649 | return -ENOMEM; | |
182ec4ee | 650 | |
1da177e4 | 651 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 652 | |
aef9ab47 DW |
653 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
654 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
655 | |
656 | /* Try to reserve enough space for both node and dirent. | |
657 | * Just the node will do for now, though | |
1da177e4 LT |
658 | */ |
659 | namelen = dentry->d_name.len; | |
9fe4854c | 660 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 661 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
662 | |
663 | if (ret) { | |
664 | jffs2_free_raw_inode(ri); | |
665 | return ret; | |
666 | } | |
667 | ||
cfc8dc6f | 668 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
669 | |
670 | if (IS_ERR(inode)) { | |
671 | jffs2_free_raw_inode(ri); | |
672 | jffs2_complete_reservation(c); | |
673 | return PTR_ERR(inode); | |
674 | } | |
675 | inode->i_op = &jffs2_file_inode_operations; | |
676 | init_special_inode(inode, inode->i_mode, rdev); | |
677 | ||
678 | f = JFFS2_INODE_INFO(inode); | |
679 | ||
680 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
681 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
682 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
683 | ||
684 | ri->compr = JFFS2_COMPR_NONE; | |
685 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
686 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 687 | |
9fe4854c | 688 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
689 | |
690 | jffs2_free_raw_inode(ri); | |
691 | ||
692 | if (IS_ERR(fn)) { | |
693 | /* Eeek. Wave bye bye */ | |
ced22070 | 694 | mutex_unlock(&f->sem); |
1da177e4 LT |
695 | jffs2_complete_reservation(c); |
696 | jffs2_clear_inode(inode); | |
697 | return PTR_ERR(fn); | |
698 | } | |
182ec4ee | 699 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
700 | obsoleted by the first data write |
701 | */ | |
702 | f->metadata = fn; | |
ced22070 | 703 | mutex_unlock(&f->sem); |
1da177e4 LT |
704 | |
705 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
706 | |
707 | ret = jffs2_init_security(inode, dir_i); | |
708 | if (ret) { | |
709 | jffs2_clear_inode(inode); | |
710 | return ret; | |
711 | } | |
cfc8dc6f | 712 | ret = jffs2_init_acl_post(inode); |
aa98d7cf KK |
713 | if (ret) { |
714 | jffs2_clear_inode(inode); | |
715 | return ret; | |
716 | } | |
717 | ||
9fe4854c DW |
718 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
719 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
720 | if (ret) { |
721 | /* Eep. */ | |
722 | jffs2_clear_inode(inode); | |
723 | return ret; | |
724 | } | |
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); | |
730 | jffs2_clear_inode(inode); | |
731 | return -ENOMEM; | |
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); |
1da177e4 LT |
762 | jffs2_clear_inode(inode); |
763 | return PTR_ERR(fd); | |
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); | |
778 | ||
779 | return 0; | |
780 | } | |
781 | ||
782 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
ef53cb02 | 783 | struct inode *new_dir_i, struct dentry *new_dentry) |
1da177e4 LT |
784 | { |
785 | int ret; | |
786 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
787 | struct jffs2_inode_info *victim_f = NULL; | |
788 | uint8_t type; | |
3a69e0cd | 789 | uint32_t now; |
1da177e4 | 790 | |
182ec4ee | 791 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
792 | * file over a directory and vice versa, but if it's a directory, |
793 | * the VFS can't check whether the victim is empty. The filesystem | |
794 | * needs to do that for itself. | |
795 | */ | |
796 | if (new_dentry->d_inode) { | |
797 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
798 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
799 | struct jffs2_full_dirent *fd; | |
800 | ||
ced22070 | 801 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
802 | for (fd = victim_f->dents; fd; fd = fd->next) { |
803 | if (fd->ino) { | |
ced22070 | 804 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
805 | return -ENOTEMPTY; |
806 | } | |
807 | } | |
ced22070 | 808 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
809 | } |
810 | } | |
811 | ||
812 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 813 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
814 | then getting -ENOSPC, is quite bad :) |
815 | */ | |
816 | ||
817 | /* Make a hard link */ | |
182ec4ee | 818 | |
1da177e4 LT |
819 | /* XXX: This is ugly */ |
820 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
821 | if (!type) type = DT_REG; | |
822 | ||
3a69e0cd | 823 | now = get_seconds(); |
182ec4ee | 824 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 825 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 826 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
827 | |
828 | if (ret) | |
829 | return ret; | |
830 | ||
831 | if (victim_f) { | |
832 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 833 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
834 | /* Don't oops if the victim was a dirent pointing to an |
835 | inode which didn't exist. */ | |
836 | if (victim_f->inocache) { | |
ced22070 | 837 | mutex_lock(&victim_f->sem); |
27c72b04 DW |
838 | if (S_ISDIR(new_dentry->d_inode->i_mode)) |
839 | victim_f->inocache->pino_nlink = 0; | |
840 | else | |
841 | victim_f->inocache->pino_nlink--; | |
ced22070 | 842 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
843 | } |
844 | } | |
845 | ||
182ec4ee | 846 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
847 | increase i_nlink on its new parent */ |
848 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 849 | inc_nlink(new_dir_i); |
1da177e4 LT |
850 | |
851 | /* Unlink the original */ | |
182ec4ee | 852 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 853 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
854 | |
855 | /* We don't touch inode->i_nlink */ | |
856 | ||
857 | if (ret) { | |
858 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
859 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
ced22070 | 860 | mutex_lock(&f->sem); |
d8c76e6f | 861 | inc_nlink(old_dentry->d_inode); |
27c72b04 DW |
862 | if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) |
863 | f->inocache->pino_nlink++; | |
ced22070 | 864 | mutex_unlock(&f->sem); |
1da177e4 LT |
865 | |
866 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
867 | /* Might as well let the VFS know */ | |
868 | d_instantiate(new_dentry, old_dentry->d_inode); | |
869 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 870 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
871 | return ret; |
872 | } | |
873 | ||
874 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 875 | drop_nlink(old_dir_i); |
1da177e4 | 876 | |
3a69e0cd AB |
877 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
878 | ||
1da177e4 LT |
879 | return 0; |
880 | } | |
881 |