Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
182ec4ee | 10 | * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/sched.h> | |
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 | ||
1da177e4 LT |
25 | static int jffs2_readdir (struct file *, void *, filldir_t); |
26 | ||
27 | static int jffs2_create (struct inode *,struct dentry *,int, | |
28 | struct nameidata *); | |
29 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, | |
30 | struct nameidata *); | |
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 *); | |
34 | static int jffs2_mkdir (struct inode *,struct dentry *,int); | |
35 | static int jffs2_rmdir (struct inode *,struct dentry *); | |
265489f0 | 36 | static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); |
1da177e4 LT |
37 | static int jffs2_rename (struct inode *, struct dentry *, |
38 | struct inode *, struct dentry *); | |
39 | ||
4b6f5d20 | 40 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
41 | { |
42 | .read = generic_read_dir, | |
43 | .readdir = jffs2_readdir, | |
44 | .ioctl = jffs2_ioctl, | |
45 | .fsync = jffs2_fsync | |
46 | }; | |
47 | ||
48 | ||
49 | struct inode_operations jffs2_dir_inode_operations = | |
50 | { | |
265489f0 DW |
51 | .create = jffs2_create, |
52 | .lookup = jffs2_lookup, | |
1da177e4 LT |
53 | .link = jffs2_link, |
54 | .unlink = jffs2_unlink, | |
55 | .symlink = jffs2_symlink, | |
56 | .mkdir = jffs2_mkdir, | |
57 | .rmdir = jffs2_rmdir, | |
58 | .mknod = jffs2_mknod, | |
59 | .rename = jffs2_rename, | |
aa98d7cf | 60 | .permission = jffs2_permission, |
1da177e4 | 61 | .setattr = jffs2_setattr, |
aa98d7cf KK |
62 | .setxattr = jffs2_setxattr, |
63 | .getxattr = jffs2_getxattr, | |
64 | .listxattr = jffs2_listxattr, | |
65 | .removexattr = jffs2_removexattr | |
1da177e4 LT |
66 | }; |
67 | ||
68 | /***********************************************************************/ | |
69 | ||
70 | ||
71 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 72 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
73 | nice and simple |
74 | */ | |
75 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
76 | struct nameidata *nd) | |
77 | { | |
78 | struct jffs2_inode_info *dir_f; | |
79 | struct jffs2_sb_info *c; | |
80 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
81 | uint32_t ino = 0; | |
82 | struct inode *inode = NULL; | |
83 | ||
84 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
85 | ||
373d5e71 RP |
86 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
87 | return ERR_PTR(-ENAMETOOLONG); | |
88 | ||
1da177e4 LT |
89 | dir_f = JFFS2_INODE_INFO(dir_i); |
90 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
91 | ||
92 | down(&dir_f->sem); | |
93 | ||
94 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
95 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 96 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
97 | (!fd || fd_list->version > fd->version) && |
98 | strlen(fd_list->name) == target->d_name.len && | |
99 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
100 | fd = fd_list; | |
101 | } | |
102 | } | |
103 | if (fd) | |
104 | ino = fd->ino; | |
105 | up(&dir_f->sem); | |
106 | if (ino) { | |
107 | inode = iget(dir_i->i_sb, ino); | |
108 | if (!inode) { | |
109 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); | |
110 | return (ERR_PTR(-EIO)); | |
111 | } | |
112 | } | |
113 | ||
114 | d_add(target, inode); | |
115 | ||
116 | return NULL; | |
117 | } | |
118 | ||
119 | /***********************************************************************/ | |
120 | ||
121 | ||
122 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
123 | { | |
124 | struct jffs2_inode_info *f; | |
125 | struct jffs2_sb_info *c; | |
ec2e203c | 126 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
127 | struct jffs2_full_dirent *fd; |
128 | unsigned long offset, curofs; | |
129 | ||
ec2e203c | 130 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); |
1da177e4 LT |
131 | |
132 | f = JFFS2_INODE_INFO(inode); | |
133 | c = JFFS2_SB_INFO(inode->i_sb); | |
134 | ||
135 | offset = filp->f_pos; | |
136 | ||
137 | if (offset == 0) { | |
138 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
139 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
140 | goto out; | |
141 | offset++; | |
142 | } | |
143 | if (offset == 1) { | |
ec2e203c | 144 | unsigned long pino = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
145 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); |
146 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
147 | goto out; | |
148 | offset++; | |
149 | } | |
150 | ||
151 | curofs=1; | |
152 | down(&f->sem); | |
153 | for (fd = f->dents; fd; fd = fd->next) { | |
154 | ||
155 | curofs++; | |
156 | /* First loop: curofs = 2; offset = 2 */ | |
157 | if (curofs < offset) { | |
182ec4ee | 158 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
159 | fd->name, fd->ino, fd->type, curofs, offset)); |
160 | continue; | |
161 | } | |
162 | if (!fd->ino) { | |
163 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
164 | offset++; | |
165 | continue; | |
166 | } | |
167 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
168 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
169 | break; | |
170 | offset++; | |
171 | } | |
172 | up(&f->sem); | |
173 | out: | |
174 | filp->f_pos = offset; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /***********************************************************************/ | |
179 | ||
180 | ||
181 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
182 | struct nameidata *nd) | |
183 | { | |
184 | struct jffs2_raw_inode *ri; | |
185 | struct jffs2_inode_info *f, *dir_f; | |
186 | struct jffs2_sb_info *c; | |
187 | struct inode *inode; | |
188 | int ret; | |
189 | ||
190 | ri = jffs2_alloc_raw_inode(); | |
191 | if (!ri) | |
192 | return -ENOMEM; | |
182ec4ee | 193 | |
1da177e4 LT |
194 | c = JFFS2_SB_INFO(dir_i->i_sb); |
195 | ||
196 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
197 | ||
198 | inode = jffs2_new_inode(dir_i, mode, ri); | |
199 | ||
200 | if (IS_ERR(inode)) { | |
201 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
202 | jffs2_free_raw_inode(ri); | |
203 | return PTR_ERR(inode); | |
204 | } | |
205 | ||
206 | inode->i_op = &jffs2_file_inode_operations; | |
207 | inode->i_fop = &jffs2_file_operations; | |
208 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
209 | inode->i_mapping->nrpages = 0; | |
210 | ||
211 | f = JFFS2_INODE_INFO(inode); | |
212 | dir_f = JFFS2_INODE_INFO(dir_i); | |
213 | ||
182ec4ee | 214 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 LT |
215 | dentry->d_name.name, dentry->d_name.len); |
216 | ||
aa98d7cf KK |
217 | if (ret) |
218 | goto fail; | |
219 | ||
220 | ret = jffs2_init_security(inode, dir_i); | |
221 | if (ret) | |
222 | goto fail; | |
223 | ret = jffs2_init_acl(inode, dir_i); | |
224 | if (ret) | |
225 | goto fail; | |
1da177e4 LT |
226 | |
227 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
228 | ||
229 | jffs2_free_raw_inode(ri); | |
230 | d_instantiate(dentry, inode); | |
231 | ||
232 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
233 | inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); | |
234 | return 0; | |
aa98d7cf KK |
235 | |
236 | fail: | |
237 | make_bad_inode(inode); | |
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 LT |
256 | if (dead_f->inocache) |
257 | dentry->d_inode->i_nlink = dead_f->inocache->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) { | |
289 | down(&f->sem); | |
290 | old_dentry->d_inode->i_nlink = ++f->inocache->nlink; | |
291 | up(&f->sem); | |
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) |
1da177e4 LT |
317 | return -EINVAL; |
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 | ||
338 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); | |
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 */ | |
365 | up(&f->sem); | |
366 | jffs2_complete_reservation(c); | |
367 | jffs2_clear_inode(inode); | |
368 | return PTR_ERR(fn); | |
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 AB |
374 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
375 | up(&f->sem); | |
376 | jffs2_complete_reservation(c); | |
377 | jffs2_clear_inode(inode); | |
378 | return -ENOMEM; | |
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; | |
388 | up(&f->sem); | |
389 | ||
390 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
391 | |
392 | ret = jffs2_init_security(inode, dir_i); | |
393 | if (ret) { | |
394 | jffs2_clear_inode(inode); | |
395 | return ret; | |
396 | } | |
397 | ret = jffs2_init_acl(inode, dir_i); | |
398 | if (ret) { | |
399 | jffs2_clear_inode(inode); | |
400 | return ret; | |
401 | } | |
402 | ||
9fe4854c DW |
403 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
404 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
405 | if (ret) { |
406 | /* Eep. */ | |
407 | jffs2_clear_inode(inode); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | rd = jffs2_alloc_raw_dirent(); | |
412 | if (!rd) { | |
413 | /* Argh. Now we treat it like a normal delete */ | |
414 | jffs2_complete_reservation(c); | |
415 | jffs2_clear_inode(inode); | |
416 | return -ENOMEM; | |
417 | } | |
418 | ||
419 | dir_f = JFFS2_INODE_INFO(dir_i); | |
420 | down(&dir_f->sem); | |
421 | ||
422 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
423 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
424 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
425 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
426 | ||
427 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
428 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
429 | rd->ino = cpu_to_je32(inode->i_ino); | |
430 | rd->mctime = cpu_to_je32(get_seconds()); | |
431 | rd->nsize = namelen; | |
432 | rd->type = DT_LNK; | |
433 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
434 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
435 | ||
9fe4854c | 436 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
437 | |
438 | if (IS_ERR(fd)) { | |
182ec4ee | 439 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
440 | as if it were the final unlink() */ |
441 | jffs2_complete_reservation(c); | |
442 | jffs2_free_raw_dirent(rd); | |
443 | up(&dir_f->sem); | |
444 | jffs2_clear_inode(inode); | |
445 | return PTR_ERR(fd); | |
446 | } | |
447 | ||
448 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
449 | ||
450 | jffs2_free_raw_dirent(rd); | |
451 | ||
452 | /* Link the fd into the inode's list, obsoleting an old | |
453 | one if necessary. */ | |
454 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
455 | ||
456 | up(&dir_f->sem); | |
457 | jffs2_complete_reservation(c); | |
458 | ||
459 | d_instantiate(dentry, inode); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | ||
464 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
465 | { | |
466 | struct jffs2_inode_info *f, *dir_f; | |
467 | struct jffs2_sb_info *c; | |
468 | struct inode *inode; | |
469 | struct jffs2_raw_inode *ri; | |
470 | struct jffs2_raw_dirent *rd; | |
471 | struct jffs2_full_dnode *fn; | |
472 | struct jffs2_full_dirent *fd; | |
473 | int namelen; | |
9fe4854c | 474 | uint32_t alloclen; |
1da177e4 LT |
475 | int ret; |
476 | ||
477 | mode |= S_IFDIR; | |
478 | ||
479 | ri = jffs2_alloc_raw_inode(); | |
480 | if (!ri) | |
481 | return -ENOMEM; | |
182ec4ee | 482 | |
1da177e4 LT |
483 | c = JFFS2_SB_INFO(dir_i->i_sb); |
484 | ||
182ec4ee TG |
485 | /* Try to reserve enough space for both node and dirent. |
486 | * Just the node will do for now, though | |
1da177e4 LT |
487 | */ |
488 | namelen = dentry->d_name.len; | |
9fe4854c DW |
489 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
490 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
491 | |
492 | if (ret) { | |
493 | jffs2_free_raw_inode(ri); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | inode = jffs2_new_inode(dir_i, mode, ri); | |
498 | ||
499 | if (IS_ERR(inode)) { | |
500 | jffs2_free_raw_inode(ri); | |
501 | jffs2_complete_reservation(c); | |
502 | return PTR_ERR(inode); | |
503 | } | |
504 | ||
505 | inode->i_op = &jffs2_dir_inode_operations; | |
506 | inode->i_fop = &jffs2_dir_operations; | |
507 | /* Directories get nlink 2 at start */ | |
508 | inode->i_nlink = 2; | |
509 | ||
510 | f = JFFS2_INODE_INFO(inode); | |
511 | ||
512 | ri->data_crc = cpu_to_je32(0); | |
513 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 514 | |
9fe4854c | 515 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
516 | |
517 | jffs2_free_raw_inode(ri); | |
518 | ||
519 | if (IS_ERR(fn)) { | |
520 | /* Eeek. Wave bye bye */ | |
521 | up(&f->sem); | |
522 | jffs2_complete_reservation(c); | |
523 | jffs2_clear_inode(inode); | |
524 | return PTR_ERR(fn); | |
525 | } | |
182ec4ee | 526 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
527 | obsoleted by the first data write |
528 | */ | |
529 | f->metadata = fn; | |
530 | up(&f->sem); | |
531 | ||
532 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
533 | |
534 | ret = jffs2_init_security(inode, dir_i); | |
535 | if (ret) { | |
536 | jffs2_clear_inode(inode); | |
537 | return ret; | |
538 | } | |
539 | ret = jffs2_init_acl(inode, dir_i); | |
540 | if (ret) { | |
541 | jffs2_clear_inode(inode); | |
542 | return ret; | |
543 | } | |
544 | ||
9fe4854c DW |
545 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
546 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
547 | if (ret) { |
548 | /* Eep. */ | |
549 | jffs2_clear_inode(inode); | |
550 | return ret; | |
551 | } | |
182ec4ee | 552 | |
1da177e4 LT |
553 | rd = jffs2_alloc_raw_dirent(); |
554 | if (!rd) { | |
555 | /* Argh. Now we treat it like a normal delete */ | |
556 | jffs2_complete_reservation(c); | |
557 | jffs2_clear_inode(inode); | |
558 | return -ENOMEM; | |
559 | } | |
560 | ||
561 | dir_f = JFFS2_INODE_INFO(dir_i); | |
562 | down(&dir_f->sem); | |
563 | ||
564 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
565 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
566 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
567 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
568 | ||
569 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
570 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
571 | rd->ino = cpu_to_je32(inode->i_ino); | |
572 | rd->mctime = cpu_to_je32(get_seconds()); | |
573 | rd->nsize = namelen; | |
574 | rd->type = DT_DIR; | |
575 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
576 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
577 | ||
9fe4854c | 578 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 579 | |
1da177e4 | 580 | if (IS_ERR(fd)) { |
182ec4ee | 581 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
582 | as if it were the final unlink() */ |
583 | jffs2_complete_reservation(c); | |
584 | jffs2_free_raw_dirent(rd); | |
585 | up(&dir_f->sem); | |
586 | jffs2_clear_inode(inode); | |
587 | return PTR_ERR(fd); | |
588 | } | |
589 | ||
590 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
d8c76e6f | 591 | inc_nlink(dir_i); |
1da177e4 LT |
592 | |
593 | jffs2_free_raw_dirent(rd); | |
594 | ||
595 | /* Link the fd into the inode's list, obsoleting an old | |
596 | one if necessary. */ | |
597 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
598 | ||
599 | up(&dir_f->sem); | |
600 | jffs2_complete_reservation(c); | |
601 | ||
602 | d_instantiate(dentry, inode); | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
607 | { | |
608 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); | |
609 | struct jffs2_full_dirent *fd; | |
610 | int ret; | |
611 | ||
612 | for (fd = f->dents ; fd; fd = fd->next) { | |
613 | if (fd->ino) | |
614 | return -ENOTEMPTY; | |
615 | } | |
616 | ret = jffs2_unlink(dir_i, dentry); | |
617 | if (!ret) | |
9a53c3a7 | 618 | drop_nlink(dir_i); |
1da177e4 LT |
619 | return ret; |
620 | } | |
621 | ||
265489f0 | 622 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
623 | { |
624 | struct jffs2_inode_info *f, *dir_f; | |
625 | struct jffs2_sb_info *c; | |
626 | struct inode *inode; | |
627 | struct jffs2_raw_inode *ri; | |
628 | struct jffs2_raw_dirent *rd; | |
629 | struct jffs2_full_dnode *fn; | |
630 | struct jffs2_full_dirent *fd; | |
631 | int namelen; | |
aef9ab47 | 632 | union jffs2_device_node dev; |
1da177e4 | 633 | int devlen = 0; |
9fe4854c | 634 | uint32_t alloclen; |
1da177e4 LT |
635 | int ret; |
636 | ||
aef9ab47 | 637 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
638 | return -EINVAL; |
639 | ||
640 | ri = jffs2_alloc_raw_inode(); | |
641 | if (!ri) | |
642 | return -ENOMEM; | |
182ec4ee | 643 | |
1da177e4 | 644 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 645 | |
aef9ab47 DW |
646 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
647 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
648 | |
649 | /* Try to reserve enough space for both node and dirent. | |
650 | * Just the node will do for now, though | |
1da177e4 LT |
651 | */ |
652 | namelen = dentry->d_name.len; | |
9fe4854c | 653 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 654 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
655 | |
656 | if (ret) { | |
657 | jffs2_free_raw_inode(ri); | |
658 | return ret; | |
659 | } | |
660 | ||
661 | inode = jffs2_new_inode(dir_i, mode, ri); | |
662 | ||
663 | if (IS_ERR(inode)) { | |
664 | jffs2_free_raw_inode(ri); | |
665 | jffs2_complete_reservation(c); | |
666 | return PTR_ERR(inode); | |
667 | } | |
668 | inode->i_op = &jffs2_file_inode_operations; | |
669 | init_special_inode(inode, inode->i_mode, rdev); | |
670 | ||
671 | f = JFFS2_INODE_INFO(inode); | |
672 | ||
673 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
674 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
675 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
676 | ||
677 | ri->compr = JFFS2_COMPR_NONE; | |
678 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
679 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 680 | |
9fe4854c | 681 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
682 | |
683 | jffs2_free_raw_inode(ri); | |
684 | ||
685 | if (IS_ERR(fn)) { | |
686 | /* Eeek. Wave bye bye */ | |
687 | up(&f->sem); | |
688 | jffs2_complete_reservation(c); | |
689 | jffs2_clear_inode(inode); | |
690 | return PTR_ERR(fn); | |
691 | } | |
182ec4ee | 692 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
693 | obsoleted by the first data write |
694 | */ | |
695 | f->metadata = fn; | |
696 | up(&f->sem); | |
697 | ||
698 | jffs2_complete_reservation(c); | |
aa98d7cf KK |
699 | |
700 | ret = jffs2_init_security(inode, dir_i); | |
701 | if (ret) { | |
702 | jffs2_clear_inode(inode); | |
703 | return ret; | |
704 | } | |
705 | ret = jffs2_init_acl(inode, dir_i); | |
706 | if (ret) { | |
707 | jffs2_clear_inode(inode); | |
708 | return ret; | |
709 | } | |
710 | ||
9fe4854c DW |
711 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
712 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
713 | if (ret) { |
714 | /* Eep. */ | |
715 | jffs2_clear_inode(inode); | |
716 | return ret; | |
717 | } | |
718 | ||
719 | rd = jffs2_alloc_raw_dirent(); | |
720 | if (!rd) { | |
721 | /* Argh. Now we treat it like a normal delete */ | |
722 | jffs2_complete_reservation(c); | |
723 | jffs2_clear_inode(inode); | |
724 | return -ENOMEM; | |
725 | } | |
726 | ||
727 | dir_f = JFFS2_INODE_INFO(dir_i); | |
728 | down(&dir_f->sem); | |
729 | ||
730 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
731 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
732 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
733 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
734 | ||
735 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
736 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
737 | rd->ino = cpu_to_je32(inode->i_ino); | |
738 | rd->mctime = cpu_to_je32(get_seconds()); | |
739 | rd->nsize = namelen; | |
740 | ||
741 | /* XXX: This is ugly. */ | |
742 | rd->type = (mode & S_IFMT) >> 12; | |
743 | ||
744 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
745 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
746 | ||
9fe4854c | 747 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 748 | |
1da177e4 | 749 | if (IS_ERR(fd)) { |
182ec4ee | 750 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
751 | as if it were the final unlink() */ |
752 | jffs2_complete_reservation(c); | |
753 | jffs2_free_raw_dirent(rd); | |
754 | up(&dir_f->sem); | |
755 | jffs2_clear_inode(inode); | |
756 | return PTR_ERR(fd); | |
757 | } | |
758 | ||
759 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
760 | ||
761 | jffs2_free_raw_dirent(rd); | |
762 | ||
763 | /* Link the fd into the inode's list, obsoleting an old | |
764 | one if necessary. */ | |
765 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
766 | ||
767 | up(&dir_f->sem); | |
768 | jffs2_complete_reservation(c); | |
769 | ||
770 | d_instantiate(dentry, inode); | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
776 | struct inode *new_dir_i, struct dentry *new_dentry) | |
777 | { | |
778 | int ret; | |
779 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
780 | struct jffs2_inode_info *victim_f = NULL; | |
781 | uint8_t type; | |
3a69e0cd | 782 | uint32_t now; |
1da177e4 | 783 | |
182ec4ee | 784 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
785 | * file over a directory and vice versa, but if it's a directory, |
786 | * the VFS can't check whether the victim is empty. The filesystem | |
787 | * needs to do that for itself. | |
788 | */ | |
789 | if (new_dentry->d_inode) { | |
790 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
791 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
792 | struct jffs2_full_dirent *fd; | |
793 | ||
794 | down(&victim_f->sem); | |
795 | for (fd = victim_f->dents; fd; fd = fd->next) { | |
796 | if (fd->ino) { | |
797 | up(&victim_f->sem); | |
798 | return -ENOTEMPTY; | |
799 | } | |
800 | } | |
801 | up(&victim_f->sem); | |
802 | } | |
803 | } | |
804 | ||
805 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 806 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
807 | then getting -ENOSPC, is quite bad :) |
808 | */ | |
809 | ||
810 | /* Make a hard link */ | |
182ec4ee | 811 | |
1da177e4 LT |
812 | /* XXX: This is ugly */ |
813 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
814 | if (!type) type = DT_REG; | |
815 | ||
3a69e0cd | 816 | now = get_seconds(); |
182ec4ee | 817 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 818 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 819 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
820 | |
821 | if (ret) | |
822 | return ret; | |
823 | ||
824 | if (victim_f) { | |
825 | /* There was a victim. Kill it off nicely */ | |
9a53c3a7 | 826 | drop_nlink(new_dentry->d_inode); |
1da177e4 LT |
827 | /* Don't oops if the victim was a dirent pointing to an |
828 | inode which didn't exist. */ | |
829 | if (victim_f->inocache) { | |
830 | down(&victim_f->sem); | |
831 | victim_f->inocache->nlink--; | |
832 | up(&victim_f->sem); | |
833 | } | |
834 | } | |
835 | ||
182ec4ee | 836 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
837 | increase i_nlink on its new parent */ |
838 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
d8c76e6f | 839 | inc_nlink(new_dir_i); |
1da177e4 LT |
840 | |
841 | /* Unlink the original */ | |
182ec4ee | 842 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 843 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
844 | |
845 | /* We don't touch inode->i_nlink */ | |
846 | ||
847 | if (ret) { | |
848 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
849 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
850 | down(&f->sem); | |
d8c76e6f | 851 | inc_nlink(old_dentry->d_inode); |
1da177e4 LT |
852 | if (f->inocache) |
853 | f->inocache->nlink++; | |
854 | up(&f->sem); | |
855 | ||
856 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
857 | /* Might as well let the VFS know */ | |
858 | d_instantiate(new_dentry, old_dentry->d_inode); | |
859 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 860 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
861 | return ret; |
862 | } | |
863 | ||
864 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
9a53c3a7 | 865 | drop_nlink(old_dir_i); |
1da177e4 | 866 | |
3a69e0cd AB |
867 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
868 | ||
1da177e4 LT |
869 | return 0; |
870 | } | |
871 |