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Commit | Line | Data |
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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, | |
60 | .setattr = jffs2_setattr, | |
61 | }; | |
62 | ||
63 | /***********************************************************************/ | |
64 | ||
65 | ||
66 | /* We keep the dirent list sorted in increasing order of name hash, | |
182ec4ee | 67 | and we use the same hash function as the dentries. Makes this |
1da177e4 LT |
68 | nice and simple |
69 | */ | |
70 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, | |
71 | struct nameidata *nd) | |
72 | { | |
73 | struct jffs2_inode_info *dir_f; | |
74 | struct jffs2_sb_info *c; | |
75 | struct jffs2_full_dirent *fd = NULL, *fd_list; | |
76 | uint32_t ino = 0; | |
77 | struct inode *inode = NULL; | |
78 | ||
79 | D1(printk(KERN_DEBUG "jffs2_lookup()\n")); | |
80 | ||
373d5e71 RP |
81 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
82 | return ERR_PTR(-ENAMETOOLONG); | |
83 | ||
1da177e4 LT |
84 | dir_f = JFFS2_INODE_INFO(dir_i); |
85 | c = JFFS2_SB_INFO(dir_i->i_sb); | |
86 | ||
87 | down(&dir_f->sem); | |
88 | ||
89 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
90 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { | |
182ec4ee | 91 | if (fd_list->nhash == target->d_name.hash && |
1da177e4 LT |
92 | (!fd || fd_list->version > fd->version) && |
93 | strlen(fd_list->name) == target->d_name.len && | |
94 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
95 | fd = fd_list; | |
96 | } | |
97 | } | |
98 | if (fd) | |
99 | ino = fd->ino; | |
100 | up(&dir_f->sem); | |
101 | if (ino) { | |
102 | inode = iget(dir_i->i_sb, ino); | |
103 | if (!inode) { | |
104 | printk(KERN_WARNING "iget() failed for ino #%u\n", ino); | |
105 | return (ERR_PTR(-EIO)); | |
106 | } | |
107 | } | |
108 | ||
109 | d_add(target, inode); | |
110 | ||
111 | return NULL; | |
112 | } | |
113 | ||
114 | /***********************************************************************/ | |
115 | ||
116 | ||
117 | static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
118 | { | |
119 | struct jffs2_inode_info *f; | |
120 | struct jffs2_sb_info *c; | |
121 | struct inode *inode = filp->f_dentry->d_inode; | |
122 | struct jffs2_full_dirent *fd; | |
123 | unsigned long offset, curofs; | |
124 | ||
125 | D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino)); | |
126 | ||
127 | f = JFFS2_INODE_INFO(inode); | |
128 | c = JFFS2_SB_INFO(inode->i_sb); | |
129 | ||
130 | offset = filp->f_pos; | |
131 | ||
132 | if (offset == 0) { | |
133 | D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); | |
134 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
135 | goto out; | |
136 | offset++; | |
137 | } | |
138 | if (offset == 1) { | |
139 | unsigned long pino = parent_ino(filp->f_dentry); | |
140 | D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); | |
141 | if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) | |
142 | goto out; | |
143 | offset++; | |
144 | } | |
145 | ||
146 | curofs=1; | |
147 | down(&f->sem); | |
148 | for (fd = f->dents; fd; fd = fd->next) { | |
149 | ||
150 | curofs++; | |
151 | /* First loop: curofs = 2; offset = 2 */ | |
152 | if (curofs < offset) { | |
182ec4ee | 153 | D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
1da177e4 LT |
154 | fd->name, fd->ino, fd->type, curofs, offset)); |
155 | continue; | |
156 | } | |
157 | if (!fd->ino) { | |
158 | D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); | |
159 | offset++; | |
160 | continue; | |
161 | } | |
162 | D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); | |
163 | if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) | |
164 | break; | |
165 | offset++; | |
166 | } | |
167 | up(&f->sem); | |
168 | out: | |
169 | filp->f_pos = offset; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | /***********************************************************************/ | |
174 | ||
175 | ||
176 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, | |
177 | struct nameidata *nd) | |
178 | { | |
179 | struct jffs2_raw_inode *ri; | |
180 | struct jffs2_inode_info *f, *dir_f; | |
181 | struct jffs2_sb_info *c; | |
182 | struct inode *inode; | |
183 | int ret; | |
184 | ||
185 | ri = jffs2_alloc_raw_inode(); | |
186 | if (!ri) | |
187 | return -ENOMEM; | |
182ec4ee | 188 | |
1da177e4 LT |
189 | c = JFFS2_SB_INFO(dir_i->i_sb); |
190 | ||
191 | D1(printk(KERN_DEBUG "jffs2_create()\n")); | |
192 | ||
193 | inode = jffs2_new_inode(dir_i, mode, ri); | |
194 | ||
195 | if (IS_ERR(inode)) { | |
196 | D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); | |
197 | jffs2_free_raw_inode(ri); | |
198 | return PTR_ERR(inode); | |
199 | } | |
200 | ||
201 | inode->i_op = &jffs2_file_inode_operations; | |
202 | inode->i_fop = &jffs2_file_operations; | |
203 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
204 | inode->i_mapping->nrpages = 0; | |
205 | ||
206 | f = JFFS2_INODE_INFO(inode); | |
207 | dir_f = JFFS2_INODE_INFO(dir_i); | |
208 | ||
182ec4ee | 209 | ret = jffs2_do_create(c, dir_f, f, ri, |
1da177e4 LT |
210 | dentry->d_name.name, dentry->d_name.len); |
211 | ||
212 | if (ret) { | |
213 | make_bad_inode(inode); | |
214 | iput(inode); | |
215 | jffs2_free_raw_inode(ri); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
220 | ||
221 | jffs2_free_raw_inode(ri); | |
222 | d_instantiate(dentry, inode); | |
223 | ||
224 | D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", | |
225 | inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | /***********************************************************************/ | |
230 | ||
231 | ||
232 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
233 | { | |
234 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
235 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
236 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); | |
237 | int ret; | |
3a69e0cd | 238 | uint32_t now = get_seconds(); |
1da177e4 | 239 | |
182ec4ee | 240 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 241 | dentry->d_name.len, dead_f, now); |
1da177e4 LT |
242 | if (dead_f->inocache) |
243 | dentry->d_inode->i_nlink = dead_f->inocache->nlink; | |
3a69e0cd AB |
244 | if (!ret) |
245 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); | |
1da177e4 LT |
246 | return ret; |
247 | } | |
248 | /***********************************************************************/ | |
249 | ||
250 | ||
251 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
252 | { | |
253 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); | |
254 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
255 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
256 | int ret; | |
257 | uint8_t type; | |
3a69e0cd | 258 | uint32_t now; |
1da177e4 LT |
259 | |
260 | /* Don't let people make hard links to bad inodes. */ | |
261 | if (!f->inocache) | |
262 | return -EIO; | |
263 | ||
264 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
265 | return -EPERM; | |
266 | ||
267 | /* XXX: This is ugly */ | |
268 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
269 | if (!type) type = DT_REG; | |
270 | ||
3a69e0cd AB |
271 | now = get_seconds(); |
272 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
273 | |
274 | if (!ret) { | |
275 | down(&f->sem); | |
276 | old_dentry->d_inode->i_nlink = ++f->inocache->nlink; | |
277 | up(&f->sem); | |
278 | d_instantiate(dentry, old_dentry->d_inode); | |
3a69e0cd | 279 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
280 | atomic_inc(&old_dentry->d_inode->i_count); |
281 | } | |
282 | return ret; | |
283 | } | |
284 | ||
285 | /***********************************************************************/ | |
286 | ||
287 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
288 | { | |
289 | struct jffs2_inode_info *f, *dir_f; | |
290 | struct jffs2_sb_info *c; | |
291 | struct inode *inode; | |
292 | struct jffs2_raw_inode *ri; | |
293 | struct jffs2_raw_dirent *rd; | |
294 | struct jffs2_full_dnode *fn; | |
295 | struct jffs2_full_dirent *fd; | |
296 | int namelen; | |
297 | uint32_t alloclen, phys_ofs; | |
32f1a95d | 298 | int ret, targetlen = strlen(target); |
1da177e4 LT |
299 | |
300 | /* FIXME: If you care. We'd need to use frags for the target | |
301 | if it grows much more than this */ | |
32f1a95d | 302 | if (targetlen > 254) |
1da177e4 LT |
303 | return -EINVAL; |
304 | ||
305 | ri = jffs2_alloc_raw_inode(); | |
306 | ||
307 | if (!ri) | |
308 | return -ENOMEM; | |
182ec4ee | 309 | |
1da177e4 | 310 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
311 | |
312 | /* Try to reserve enough space for both node and dirent. | |
313 | * Just the node will do for now, though | |
1da177e4 LT |
314 | */ |
315 | namelen = dentry->d_name.len; | |
e631ddba FH |
316 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, |
317 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
318 | |
319 | if (ret) { | |
320 | jffs2_free_raw_inode(ri); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); | |
325 | ||
326 | if (IS_ERR(inode)) { | |
327 | jffs2_free_raw_inode(ri); | |
328 | jffs2_complete_reservation(c); | |
329 | return PTR_ERR(inode); | |
330 | } | |
331 | ||
332 | inode->i_op = &jffs2_symlink_inode_operations; | |
333 | ||
334 | f = JFFS2_INODE_INFO(inode); | |
335 | ||
32f1a95d | 336 | inode->i_size = targetlen; |
1da177e4 LT |
337 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
338 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
339 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
340 | ||
341 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 342 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 343 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 344 | |
32f1a95d | 345 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL); |
1da177e4 LT |
346 | |
347 | jffs2_free_raw_inode(ri); | |
348 | ||
349 | if (IS_ERR(fn)) { | |
350 | /* Eeek. Wave bye bye */ | |
351 | up(&f->sem); | |
352 | jffs2_complete_reservation(c); | |
353 | jffs2_clear_inode(inode); | |
354 | return PTR_ERR(fn); | |
355 | } | |
32f1a95d | 356 | |
2b79adcc AB |
357 | /* We use f->target field to store the target path. */ |
358 | f->target = kmalloc(targetlen + 1, GFP_KERNEL); | |
359 | if (!f->target) { | |
32f1a95d AB |
360 | printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); |
361 | up(&f->sem); | |
362 | jffs2_complete_reservation(c); | |
363 | jffs2_clear_inode(inode); | |
364 | return -ENOMEM; | |
365 | } | |
366 | ||
2b79adcc AB |
367 | memcpy(f->target, target, targetlen + 1); |
368 | D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); | |
32f1a95d | 369 | |
182ec4ee | 370 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
371 | obsoleted by the first data write |
372 | */ | |
373 | f->metadata = fn; | |
374 | up(&f->sem); | |
375 | ||
376 | jffs2_complete_reservation(c); | |
e631ddba FH |
377 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, |
378 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
379 | if (ret) { |
380 | /* Eep. */ | |
381 | jffs2_clear_inode(inode); | |
382 | return ret; | |
383 | } | |
384 | ||
385 | rd = jffs2_alloc_raw_dirent(); | |
386 | if (!rd) { | |
387 | /* Argh. Now we treat it like a normal delete */ | |
388 | jffs2_complete_reservation(c); | |
389 | jffs2_clear_inode(inode); | |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
393 | dir_f = JFFS2_INODE_INFO(dir_i); | |
394 | down(&dir_f->sem); | |
395 | ||
396 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
397 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
398 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
399 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
400 | ||
401 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
402 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
403 | rd->ino = cpu_to_je32(inode->i_ino); | |
404 | rd->mctime = cpu_to_je32(get_seconds()); | |
405 | rd->nsize = namelen; | |
406 | rd->type = DT_LNK; | |
407 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
408 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
409 | ||
410 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); | |
411 | ||
412 | if (IS_ERR(fd)) { | |
182ec4ee | 413 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
414 | as if it were the final unlink() */ |
415 | jffs2_complete_reservation(c); | |
416 | jffs2_free_raw_dirent(rd); | |
417 | up(&dir_f->sem); | |
418 | jffs2_clear_inode(inode); | |
419 | return PTR_ERR(fd); | |
420 | } | |
421 | ||
422 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
423 | ||
424 | jffs2_free_raw_dirent(rd); | |
425 | ||
426 | /* Link the fd into the inode's list, obsoleting an old | |
427 | one if necessary. */ | |
428 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
429 | ||
430 | up(&dir_f->sem); | |
431 | jffs2_complete_reservation(c); | |
432 | ||
433 | d_instantiate(dentry, inode); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | ||
438 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) | |
439 | { | |
440 | struct jffs2_inode_info *f, *dir_f; | |
441 | struct jffs2_sb_info *c; | |
442 | struct inode *inode; | |
443 | struct jffs2_raw_inode *ri; | |
444 | struct jffs2_raw_dirent *rd; | |
445 | struct jffs2_full_dnode *fn; | |
446 | struct jffs2_full_dirent *fd; | |
447 | int namelen; | |
448 | uint32_t alloclen, phys_ofs; | |
449 | int ret; | |
450 | ||
451 | mode |= S_IFDIR; | |
452 | ||
453 | ri = jffs2_alloc_raw_inode(); | |
454 | if (!ri) | |
455 | return -ENOMEM; | |
182ec4ee | 456 | |
1da177e4 LT |
457 | c = JFFS2_SB_INFO(dir_i->i_sb); |
458 | ||
182ec4ee TG |
459 | /* Try to reserve enough space for both node and dirent. |
460 | * Just the node will do for now, though | |
1da177e4 LT |
461 | */ |
462 | namelen = dentry->d_name.len; | |
e631ddba FH |
463 | ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL, |
464 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
465 | |
466 | if (ret) { | |
467 | jffs2_free_raw_inode(ri); | |
468 | return ret; | |
469 | } | |
470 | ||
471 | inode = jffs2_new_inode(dir_i, mode, ri); | |
472 | ||
473 | if (IS_ERR(inode)) { | |
474 | jffs2_free_raw_inode(ri); | |
475 | jffs2_complete_reservation(c); | |
476 | return PTR_ERR(inode); | |
477 | } | |
478 | ||
479 | inode->i_op = &jffs2_dir_inode_operations; | |
480 | inode->i_fop = &jffs2_dir_operations; | |
481 | /* Directories get nlink 2 at start */ | |
482 | inode->i_nlink = 2; | |
483 | ||
484 | f = JFFS2_INODE_INFO(inode); | |
485 | ||
486 | ri->data_crc = cpu_to_je32(0); | |
487 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 488 | |
1da177e4 LT |
489 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); |
490 | ||
491 | jffs2_free_raw_inode(ri); | |
492 | ||
493 | if (IS_ERR(fn)) { | |
494 | /* Eeek. Wave bye bye */ | |
495 | up(&f->sem); | |
496 | jffs2_complete_reservation(c); | |
497 | jffs2_clear_inode(inode); | |
498 | return PTR_ERR(fn); | |
499 | } | |
182ec4ee | 500 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
501 | obsoleted by the first data write |
502 | */ | |
503 | f->metadata = fn; | |
504 | up(&f->sem); | |
505 | ||
506 | jffs2_complete_reservation(c); | |
e631ddba FH |
507 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, |
508 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
509 | if (ret) { |
510 | /* Eep. */ | |
511 | jffs2_clear_inode(inode); | |
512 | return ret; | |
513 | } | |
182ec4ee | 514 | |
1da177e4 LT |
515 | rd = jffs2_alloc_raw_dirent(); |
516 | if (!rd) { | |
517 | /* Argh. Now we treat it like a normal delete */ | |
518 | jffs2_complete_reservation(c); | |
519 | jffs2_clear_inode(inode); | |
520 | return -ENOMEM; | |
521 | } | |
522 | ||
523 | dir_f = JFFS2_INODE_INFO(dir_i); | |
524 | down(&dir_f->sem); | |
525 | ||
526 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
527 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
528 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
529 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
530 | ||
531 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
532 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
533 | rd->ino = cpu_to_je32(inode->i_ino); | |
534 | rd->mctime = cpu_to_je32(get_seconds()); | |
535 | rd->nsize = namelen; | |
536 | rd->type = DT_DIR; | |
537 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
538 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
539 | ||
540 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); | |
182ec4ee | 541 | |
1da177e4 | 542 | if (IS_ERR(fd)) { |
182ec4ee | 543 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
544 | as if it were the final unlink() */ |
545 | jffs2_complete_reservation(c); | |
546 | jffs2_free_raw_dirent(rd); | |
547 | up(&dir_f->sem); | |
548 | jffs2_clear_inode(inode); | |
549 | return PTR_ERR(fd); | |
550 | } | |
551 | ||
552 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
553 | dir_i->i_nlink++; | |
554 | ||
555 | jffs2_free_raw_dirent(rd); | |
556 | ||
557 | /* Link the fd into the inode's list, obsoleting an old | |
558 | one if necessary. */ | |
559 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
560 | ||
561 | up(&dir_f->sem); | |
562 | jffs2_complete_reservation(c); | |
563 | ||
564 | d_instantiate(dentry, inode); | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
569 | { | |
570 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); | |
571 | struct jffs2_full_dirent *fd; | |
572 | int ret; | |
573 | ||
574 | for (fd = f->dents ; fd; fd = fd->next) { | |
575 | if (fd->ino) | |
576 | return -ENOTEMPTY; | |
577 | } | |
578 | ret = jffs2_unlink(dir_i, dentry); | |
579 | if (!ret) | |
580 | dir_i->i_nlink--; | |
581 | return ret; | |
582 | } | |
583 | ||
265489f0 | 584 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) |
1da177e4 LT |
585 | { |
586 | struct jffs2_inode_info *f, *dir_f; | |
587 | struct jffs2_sb_info *c; | |
588 | struct inode *inode; | |
589 | struct jffs2_raw_inode *ri; | |
590 | struct jffs2_raw_dirent *rd; | |
591 | struct jffs2_full_dnode *fn; | |
592 | struct jffs2_full_dirent *fd; | |
593 | int namelen; | |
aef9ab47 | 594 | union jffs2_device_node dev; |
1da177e4 LT |
595 | int devlen = 0; |
596 | uint32_t alloclen, phys_ofs; | |
597 | int ret; | |
598 | ||
aef9ab47 | 599 | if (!new_valid_dev(rdev)) |
1da177e4 LT |
600 | return -EINVAL; |
601 | ||
602 | ri = jffs2_alloc_raw_inode(); | |
603 | if (!ri) | |
604 | return -ENOMEM; | |
182ec4ee | 605 | |
1da177e4 | 606 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 607 | |
aef9ab47 DW |
608 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
609 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
610 | |
611 | /* Try to reserve enough space for both node and dirent. | |
612 | * Just the node will do for now, though | |
1da177e4 LT |
613 | */ |
614 | namelen = dentry->d_name.len; | |
e631ddba | 615 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, |
aef9ab47 | 616 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
617 | |
618 | if (ret) { | |
619 | jffs2_free_raw_inode(ri); | |
620 | return ret; | |
621 | } | |
622 | ||
623 | inode = jffs2_new_inode(dir_i, mode, ri); | |
624 | ||
625 | if (IS_ERR(inode)) { | |
626 | jffs2_free_raw_inode(ri); | |
627 | jffs2_complete_reservation(c); | |
628 | return PTR_ERR(inode); | |
629 | } | |
630 | inode->i_op = &jffs2_file_inode_operations; | |
631 | init_special_inode(inode, inode->i_mode, rdev); | |
632 | ||
633 | f = JFFS2_INODE_INFO(inode); | |
634 | ||
635 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
636 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
637 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
638 | ||
639 | ri->compr = JFFS2_COMPR_NONE; | |
640 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
641 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 642 | |
1da177e4 LT |
643 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); |
644 | ||
645 | jffs2_free_raw_inode(ri); | |
646 | ||
647 | if (IS_ERR(fn)) { | |
648 | /* Eeek. Wave bye bye */ | |
649 | up(&f->sem); | |
650 | jffs2_complete_reservation(c); | |
651 | jffs2_clear_inode(inode); | |
652 | return PTR_ERR(fn); | |
653 | } | |
182ec4ee | 654 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
655 | obsoleted by the first data write |
656 | */ | |
657 | f->metadata = fn; | |
658 | up(&f->sem); | |
659 | ||
660 | jffs2_complete_reservation(c); | |
e631ddba FH |
661 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, |
662 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
663 | if (ret) { |
664 | /* Eep. */ | |
665 | jffs2_clear_inode(inode); | |
666 | return ret; | |
667 | } | |
668 | ||
669 | rd = jffs2_alloc_raw_dirent(); | |
670 | if (!rd) { | |
671 | /* Argh. Now we treat it like a normal delete */ | |
672 | jffs2_complete_reservation(c); | |
673 | jffs2_clear_inode(inode); | |
674 | return -ENOMEM; | |
675 | } | |
676 | ||
677 | dir_f = JFFS2_INODE_INFO(dir_i); | |
678 | down(&dir_f->sem); | |
679 | ||
680 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
681 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
682 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
683 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
684 | ||
685 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
686 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
687 | rd->ino = cpu_to_je32(inode->i_ino); | |
688 | rd->mctime = cpu_to_je32(get_seconds()); | |
689 | rd->nsize = namelen; | |
690 | ||
691 | /* XXX: This is ugly. */ | |
692 | rd->type = (mode & S_IFMT) >> 12; | |
693 | ||
694 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
695 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
696 | ||
697 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); | |
182ec4ee | 698 | |
1da177e4 | 699 | if (IS_ERR(fd)) { |
182ec4ee | 700 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
701 | as if it were the final unlink() */ |
702 | jffs2_complete_reservation(c); | |
703 | jffs2_free_raw_dirent(rd); | |
704 | up(&dir_f->sem); | |
705 | jffs2_clear_inode(inode); | |
706 | return PTR_ERR(fd); | |
707 | } | |
708 | ||
709 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); | |
710 | ||
711 | jffs2_free_raw_dirent(rd); | |
712 | ||
713 | /* Link the fd into the inode's list, obsoleting an old | |
714 | one if necessary. */ | |
715 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
716 | ||
717 | up(&dir_f->sem); | |
718 | jffs2_complete_reservation(c); | |
719 | ||
720 | d_instantiate(dentry, inode); | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
726 | struct inode *new_dir_i, struct dentry *new_dentry) | |
727 | { | |
728 | int ret; | |
729 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
730 | struct jffs2_inode_info *victim_f = NULL; | |
731 | uint8_t type; | |
3a69e0cd | 732 | uint32_t now; |
1da177e4 | 733 | |
182ec4ee | 734 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
735 | * file over a directory and vice versa, but if it's a directory, |
736 | * the VFS can't check whether the victim is empty. The filesystem | |
737 | * needs to do that for itself. | |
738 | */ | |
739 | if (new_dentry->d_inode) { | |
740 | victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); | |
741 | if (S_ISDIR(new_dentry->d_inode->i_mode)) { | |
742 | struct jffs2_full_dirent *fd; | |
743 | ||
744 | down(&victim_f->sem); | |
745 | for (fd = victim_f->dents; fd; fd = fd->next) { | |
746 | if (fd->ino) { | |
747 | up(&victim_f->sem); | |
748 | return -ENOTEMPTY; | |
749 | } | |
750 | } | |
751 | up(&victim_f->sem); | |
752 | } | |
753 | } | |
754 | ||
755 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 756 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
757 | then getting -ENOSPC, is quite bad :) |
758 | */ | |
759 | ||
760 | /* Make a hard link */ | |
182ec4ee | 761 | |
1da177e4 LT |
762 | /* XXX: This is ugly */ |
763 | type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; | |
764 | if (!type) type = DT_REG; | |
765 | ||
3a69e0cd | 766 | now = get_seconds(); |
182ec4ee | 767 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
1da177e4 | 768 | old_dentry->d_inode->i_ino, type, |
3a69e0cd | 769 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
770 | |
771 | if (ret) | |
772 | return ret; | |
773 | ||
774 | if (victim_f) { | |
775 | /* There was a victim. Kill it off nicely */ | |
776 | new_dentry->d_inode->i_nlink--; | |
777 | /* Don't oops if the victim was a dirent pointing to an | |
778 | inode which didn't exist. */ | |
779 | if (victim_f->inocache) { | |
780 | down(&victim_f->sem); | |
781 | victim_f->inocache->nlink--; | |
782 | up(&victim_f->sem); | |
783 | } | |
784 | } | |
785 | ||
182ec4ee | 786 | /* If it was a directory we moved, and there was no victim, |
1da177e4 LT |
787 | increase i_nlink on its new parent */ |
788 | if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) | |
789 | new_dir_i->i_nlink++; | |
790 | ||
791 | /* Unlink the original */ | |
182ec4ee | 792 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 793 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
794 | |
795 | /* We don't touch inode->i_nlink */ | |
796 | ||
797 | if (ret) { | |
798 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
799 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); | |
800 | down(&f->sem); | |
801 | old_dentry->d_inode->i_nlink++; | |
802 | if (f->inocache) | |
803 | f->inocache->nlink++; | |
804 | up(&f->sem); | |
805 | ||
806 | printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); | |
807 | /* Might as well let the VFS know */ | |
808 | d_instantiate(new_dentry, old_dentry->d_inode); | |
809 | atomic_inc(&old_dentry->d_inode->i_count); | |
3a69e0cd | 810 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
1da177e4 LT |
811 | return ret; |
812 | } | |
813 | ||
814 | if (S_ISDIR(old_dentry->d_inode->i_mode)) | |
815 | old_dir_i->i_nlink--; | |
816 | ||
3a69e0cd AB |
817 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
818 | ||
1da177e4 LT |
819 | return 0; |
820 | } | |
821 |