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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
6088c058 | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> | |
8 | * | |
9 | * For licensing information, see the file 'LICENCE' in this directory. | |
10 | * | |
1da177e4 LT |
11 | */ |
12 | ||
5a528957 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/slab.h> | |
1da177e4 LT |
17 | #include <linux/fs.h> |
18 | #include <linux/crc32.h> | |
19 | #include <linux/jffs2.h> | |
cbb9a561 DW |
20 | #include "jffs2_fs_i.h" |
21 | #include "jffs2_fs_sb.h" | |
1da177e4 LT |
22 | #include <linux/time.h> |
23 | #include "nodelist.h" | |
24 | ||
0312fa7c | 25 | static int jffs2_readdir (struct file *, struct dir_context *); |
1da177e4 | 26 | |
4acdaf27 | 27 | static int jffs2_create (struct inode *,struct dentry *,umode_t, |
ebfc3b49 | 28 | bool); |
1da177e4 | 29 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, |
00cd8dd3 | 30 | unsigned int); |
1da177e4 LT |
31 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); |
32 | static int jffs2_unlink (struct inode *,struct dentry *); | |
33 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); | |
18bb1db3 | 34 | static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); |
1da177e4 | 35 | static int jffs2_rmdir (struct inode *,struct dentry *); |
1a67aafb | 36 | static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); |
1da177e4 | 37 | static int jffs2_rename (struct inode *, struct dentry *, |
f03b8ad8 MS |
38 | struct inode *, struct dentry *, |
39 | unsigned int); | |
1da177e4 | 40 | |
4b6f5d20 | 41 | const struct file_operations jffs2_dir_operations = |
1da177e4 LT |
42 | { |
43 | .read = generic_read_dir, | |
c51da20c | 44 | .iterate_shared=jffs2_readdir, |
0533400b | 45 | .unlocked_ioctl=jffs2_ioctl, |
3222a3e5 CH |
46 | .fsync = jffs2_fsync, |
47 | .llseek = generic_file_llseek, | |
1da177e4 LT |
48 | }; |
49 | ||
50 | ||
92e1d5be | 51 | const struct inode_operations jffs2_dir_inode_operations = |
1da177e4 | 52 | { |
265489f0 DW |
53 | .create = jffs2_create, |
54 | .lookup = jffs2_lookup, | |
1da177e4 LT |
55 | .link = jffs2_link, |
56 | .unlink = jffs2_unlink, | |
57 | .symlink = jffs2_symlink, | |
58 | .mkdir = jffs2_mkdir, | |
59 | .rmdir = jffs2_rmdir, | |
60 | .mknod = jffs2_mknod, | |
61 | .rename = jffs2_rename, | |
4e34e719 | 62 | .get_acl = jffs2_get_acl, |
f2963d45 | 63 | .set_acl = jffs2_set_acl, |
1da177e4 | 64 | .setattr = jffs2_setattr, |
aa98d7cf | 65 | .listxattr = jffs2_listxattr, |
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, | |
00cd8dd3 | 76 | unsigned int flags) |
1da177e4 LT |
77 | { |
78 | struct jffs2_inode_info *dir_f; | |
1da177e4 LT |
79 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
80 | uint32_t ino = 0; | |
81 | struct inode *inode = NULL; | |
8387ff25 | 82 | unsigned int nhash; |
1da177e4 | 83 | |
9c261b33 | 84 | jffs2_dbg(1, "jffs2_lookup()\n"); |
1da177e4 | 85 | |
373d5e71 RP |
86 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
87 | return ERR_PTR(-ENAMETOOLONG); | |
88 | ||
1da177e4 | 89 | dir_f = JFFS2_INODE_INFO(dir_i); |
1da177e4 | 90 | |
8387ff25 LT |
91 | /* The 'nhash' on the fd_list is not the same as the dentry hash */ |
92 | nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); | |
93 | ||
ced22070 | 94 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
95 | |
96 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ | |
8387ff25 LT |
97 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { |
98 | if (fd_list->nhash == nhash && | |
1da177e4 LT |
99 | (!fd || fd_list->version > fd->version) && |
100 | strlen(fd_list->name) == target->d_name.len && | |
101 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { | |
102 | fd = fd_list; | |
103 | } | |
104 | } | |
105 | if (fd) | |
106 | ino = fd->ino; | |
ced22070 | 107 | mutex_unlock(&dir_f->sem); |
1da177e4 | 108 | if (ino) { |
5451f79f | 109 | inode = jffs2_iget(dir_i->i_sb, ino); |
a9049376 | 110 | if (IS_ERR(inode)) |
da320f05 | 111 | pr_warn("iget() failed for ino #%u\n", ino); |
1da177e4 LT |
112 | } |
113 | ||
8966c5e0 | 114 | return d_splice_alias(inode, target); |
1da177e4 LT |
115 | } |
116 | ||
117 | /***********************************************************************/ | |
118 | ||
119 | ||
0312fa7c | 120 | static int jffs2_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 121 | { |
0312fa7c AV |
122 | struct inode *inode = file_inode(file); |
123 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
1da177e4 | 124 | struct jffs2_full_dirent *fd; |
0312fa7c | 125 | unsigned long curofs = 1; |
1da177e4 | 126 | |
0312fa7c | 127 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); |
1da177e4 | 128 | |
0312fa7c AV |
129 | if (!dir_emit_dots(file, ctx)) |
130 | return 0; | |
1da177e4 | 131 | |
ced22070 | 132 | mutex_lock(&f->sem); |
1da177e4 | 133 | for (fd = f->dents; fd; fd = fd->next) { |
1da177e4 | 134 | curofs++; |
0312fa7c AV |
135 | /* First loop: curofs = 2; pos = 2 */ |
136 | if (curofs < ctx->pos) { | |
9c261b33 | 137 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
0312fa7c | 138 | fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
1da177e4 LT |
139 | continue; |
140 | } | |
141 | if (!fd->ino) { | |
9c261b33 JP |
142 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
143 | fd->name); | |
0312fa7c | 144 | ctx->pos++; |
1da177e4 LT |
145 | continue; |
146 | } | |
9c261b33 | 147 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
0312fa7c AV |
148 | (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); |
149 | if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) | |
1da177e4 | 150 | break; |
0312fa7c | 151 | ctx->pos++; |
1da177e4 | 152 | } |
ced22070 | 153 | mutex_unlock(&f->sem); |
1da177e4 LT |
154 | return 0; |
155 | } | |
156 | ||
157 | /***********************************************************************/ | |
158 | ||
159 | ||
4acdaf27 | 160 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
ebfc3b49 | 161 | umode_t mode, bool excl) |
1da177e4 LT |
162 | { |
163 | struct jffs2_raw_inode *ri; | |
164 | struct jffs2_inode_info *f, *dir_f; | |
165 | struct jffs2_sb_info *c; | |
166 | struct inode *inode; | |
167 | int ret; | |
168 | ||
169 | ri = jffs2_alloc_raw_inode(); | |
170 | if (!ri) | |
171 | return -ENOMEM; | |
182ec4ee | 172 | |
1da177e4 LT |
173 | c = JFFS2_SB_INFO(dir_i->i_sb); |
174 | ||
9c261b33 | 175 | jffs2_dbg(1, "%s()\n", __func__); |
1da177e4 | 176 | |
cfc8dc6f | 177 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
178 | |
179 | if (IS_ERR(inode)) { | |
9c261b33 | 180 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
1da177e4 LT |
181 | jffs2_free_raw_inode(ri); |
182 | return PTR_ERR(inode); | |
183 | } | |
184 | ||
185 | inode->i_op = &jffs2_file_inode_operations; | |
186 | inode->i_fop = &jffs2_file_operations; | |
187 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
188 | inode->i_mapping->nrpages = 0; | |
189 | ||
190 | f = JFFS2_INODE_INFO(inode); | |
191 | dir_f = JFFS2_INODE_INFO(dir_i); | |
192 | ||
590fe34c DW |
193 | /* jffs2_do_create() will want to lock it, _after_ reserving |
194 | space and taking c-alloc_sem. If we keep it locked here, | |
195 | lockdep gets unhappy (although it's a false positive; | |
196 | nothing else will be looking at this inode yet so there's | |
197 | no chance of AB-BA deadlock involving its f->sem). */ | |
198 | mutex_unlock(&f->sem); | |
199 | ||
2a7dba39 | 200 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
aa98d7cf KK |
201 | if (ret) |
202 | goto fail; | |
1da177e4 | 203 | |
95582b00 | 204 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(je32_to_cpu(ri->ctime))); |
1da177e4 LT |
205 | |
206 | jffs2_free_raw_inode(ri); | |
1da177e4 | 207 | |
9c261b33 JP |
208 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
209 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, | |
210 | f->inocache->pino_nlink, inode->i_mapping->nrpages); | |
e72e6497 | 211 | |
1e2e547a | 212 | d_instantiate_new(dentry, inode); |
1da177e4 | 213 | return 0; |
aa98d7cf KK |
214 | |
215 | fail: | |
41cce647 | 216 | iget_failed(inode); |
aa98d7cf KK |
217 | jffs2_free_raw_inode(ri); |
218 | return ret; | |
1da177e4 LT |
219 | } |
220 | ||
221 | /***********************************************************************/ | |
222 | ||
223 | ||
224 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) | |
225 | { | |
226 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); | |
227 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
2b0143b5 | 228 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); |
1da177e4 | 229 | int ret; |
3a69e0cd | 230 | uint32_t now = get_seconds(); |
1da177e4 | 231 | |
182ec4ee | 232 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
3a69e0cd | 233 | dentry->d_name.len, dead_f, now); |
1da177e4 | 234 | if (dead_f->inocache) |
2b0143b5 | 235 | set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); |
3a69e0cd | 236 | if (!ret) |
95582b00 | 237 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(now)); |
1da177e4 LT |
238 | return ret; |
239 | } | |
240 | /***********************************************************************/ | |
241 | ||
242 | ||
243 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) | |
244 | { | |
fc64005c | 245 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); |
2b0143b5 | 246 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
1da177e4 LT |
247 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
248 | int ret; | |
249 | uint8_t type; | |
3a69e0cd | 250 | uint32_t now; |
1da177e4 LT |
251 | |
252 | /* Don't let people make hard links to bad inodes. */ | |
253 | if (!f->inocache) | |
254 | return -EIO; | |
255 | ||
e36cb0b8 | 256 | if (d_is_dir(old_dentry)) |
1da177e4 LT |
257 | return -EPERM; |
258 | ||
259 | /* XXX: This is ugly */ | |
2b0143b5 | 260 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
1da177e4 LT |
261 | if (!type) type = DT_REG; |
262 | ||
3a69e0cd AB |
263 | now = get_seconds(); |
264 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); | |
1da177e4 LT |
265 | |
266 | if (!ret) { | |
ced22070 | 267 | mutex_lock(&f->sem); |
2b0143b5 | 268 | set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); |
ced22070 | 269 | mutex_unlock(&f->sem); |
2b0143b5 | 270 | d_instantiate(dentry, d_inode(old_dentry)); |
95582b00 | 271 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(now)); |
2b0143b5 | 272 | ihold(d_inode(old_dentry)); |
1da177e4 LT |
273 | } |
274 | return ret; | |
275 | } | |
276 | ||
277 | /***********************************************************************/ | |
278 | ||
279 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) | |
280 | { | |
281 | struct jffs2_inode_info *f, *dir_f; | |
282 | struct jffs2_sb_info *c; | |
283 | struct inode *inode; | |
284 | struct jffs2_raw_inode *ri; | |
285 | struct jffs2_raw_dirent *rd; | |
286 | struct jffs2_full_dnode *fn; | |
287 | struct jffs2_full_dirent *fd; | |
288 | int namelen; | |
9fe4854c | 289 | uint32_t alloclen; |
32f1a95d | 290 | int ret, targetlen = strlen(target); |
1da177e4 LT |
291 | |
292 | /* FIXME: If you care. We'd need to use frags for the target | |
293 | if it grows much more than this */ | |
32f1a95d | 294 | if (targetlen > 254) |
bde86fec | 295 | return -ENAMETOOLONG; |
1da177e4 LT |
296 | |
297 | ri = jffs2_alloc_raw_inode(); | |
298 | ||
299 | if (!ri) | |
300 | return -ENOMEM; | |
182ec4ee | 301 | |
1da177e4 | 302 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee TG |
303 | |
304 | /* Try to reserve enough space for both node and dirent. | |
305 | * Just the node will do for now, though | |
1da177e4 LT |
306 | */ |
307 | namelen = dentry->d_name.len; | |
9fe4854c DW |
308 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
309 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
310 | |
311 | if (ret) { | |
312 | jffs2_free_raw_inode(ri); | |
313 | return ret; | |
314 | } | |
315 | ||
cfc8dc6f | 316 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
1da177e4 LT |
317 | |
318 | if (IS_ERR(inode)) { | |
319 | jffs2_free_raw_inode(ri); | |
320 | jffs2_complete_reservation(c); | |
321 | return PTR_ERR(inode); | |
322 | } | |
323 | ||
324 | inode->i_op = &jffs2_symlink_inode_operations; | |
325 | ||
326 | f = JFFS2_INODE_INFO(inode); | |
327 | ||
32f1a95d | 328 | inode->i_size = targetlen; |
1da177e4 LT |
329 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
330 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); | |
331 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
332 | ||
333 | ri->compr = JFFS2_COMPR_NONE; | |
32f1a95d | 334 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
1da177e4 | 335 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
182ec4ee | 336 | |
9fe4854c | 337 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
1da177e4 LT |
338 | |
339 | jffs2_free_raw_inode(ri); | |
340 | ||
341 | if (IS_ERR(fn)) { | |
342 | /* Eeek. Wave bye bye */ | |
ced22070 | 343 | mutex_unlock(&f->sem); |
1da177e4 | 344 | jffs2_complete_reservation(c); |
f324e4cb DW |
345 | ret = PTR_ERR(fn); |
346 | goto fail; | |
1da177e4 | 347 | } |
32f1a95d | 348 | |
2b79adcc | 349 | /* We use f->target field to store the target path. */ |
04aadf36 | 350 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
2b79adcc | 351 | if (!f->target) { |
da320f05 | 352 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
ced22070 | 353 | mutex_unlock(&f->sem); |
32f1a95d | 354 | jffs2_complete_reservation(c); |
f324e4cb DW |
355 | ret = -ENOMEM; |
356 | goto fail; | |
32f1a95d | 357 | } |
a8db149f | 358 | inode->i_link = f->target; |
32f1a95d | 359 | |
9c261b33 JP |
360 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
361 | __func__, (char *)f->target); | |
32f1a95d | 362 | |
182ec4ee | 363 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
364 | obsoleted by the first data write |
365 | */ | |
366 | f->metadata = fn; | |
ced22070 | 367 | mutex_unlock(&f->sem); |
1da177e4 LT |
368 | |
369 | jffs2_complete_reservation(c); | |
aa98d7cf | 370 | |
2a7dba39 | 371 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
372 | if (ret) |
373 | goto fail; | |
374 | ||
cfc8dc6f | 375 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
376 | if (ret) |
377 | goto fail; | |
aa98d7cf | 378 | |
9fe4854c DW |
379 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
380 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
381 | if (ret) |
382 | goto fail; | |
1da177e4 LT |
383 | |
384 | rd = jffs2_alloc_raw_dirent(); | |
385 | if (!rd) { | |
386 | /* Argh. Now we treat it like a normal delete */ | |
387 | jffs2_complete_reservation(c); | |
f324e4cb DW |
388 | ret = -ENOMEM; |
389 | goto fail; | |
1da177e4 LT |
390 | } |
391 | ||
392 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 393 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
394 | |
395 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
396 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
397 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
398 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
399 | ||
400 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
401 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
402 | rd->ino = cpu_to_je32(inode->i_ino); | |
403 | rd->mctime = cpu_to_je32(get_seconds()); | |
404 | rd->nsize = namelen; | |
405 | rd->type = DT_LNK; | |
406 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
407 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
408 | ||
9fe4854c | 409 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
410 | |
411 | if (IS_ERR(fd)) { | |
182ec4ee | 412 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
413 | as if it were the final unlink() */ |
414 | jffs2_complete_reservation(c); | |
415 | jffs2_free_raw_dirent(rd); | |
ced22070 | 416 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
417 | ret = PTR_ERR(fd); |
418 | goto fail; | |
1da177e4 LT |
419 | } |
420 | ||
95582b00 | 421 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(je32_to_cpu(rd->mctime))); |
1da177e4 LT |
422 | |
423 | jffs2_free_raw_dirent(rd); | |
424 | ||
425 | /* Link the fd into the inode's list, obsoleting an old | |
426 | one if necessary. */ | |
427 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
428 | ||
ced22070 | 429 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
430 | jffs2_complete_reservation(c); |
431 | ||
1e2e547a | 432 | d_instantiate_new(dentry, inode); |
1da177e4 | 433 | return 0; |
f324e4cb DW |
434 | |
435 | fail: | |
41cce647 | 436 | iget_failed(inode); |
f324e4cb | 437 | return ret; |
1da177e4 LT |
438 | } |
439 | ||
440 | ||
18bb1db3 | 441 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
442 | { |
443 | struct jffs2_inode_info *f, *dir_f; | |
444 | struct jffs2_sb_info *c; | |
445 | struct inode *inode; | |
446 | struct jffs2_raw_inode *ri; | |
447 | struct jffs2_raw_dirent *rd; | |
448 | struct jffs2_full_dnode *fn; | |
449 | struct jffs2_full_dirent *fd; | |
450 | int namelen; | |
9fe4854c | 451 | uint32_t alloclen; |
1da177e4 LT |
452 | int ret; |
453 | ||
454 | mode |= S_IFDIR; | |
455 | ||
456 | ri = jffs2_alloc_raw_inode(); | |
457 | if (!ri) | |
458 | return -ENOMEM; | |
182ec4ee | 459 | |
1da177e4 LT |
460 | c = JFFS2_SB_INFO(dir_i->i_sb); |
461 | ||
182ec4ee TG |
462 | /* Try to reserve enough space for both node and dirent. |
463 | * Just the node will do for now, though | |
1da177e4 LT |
464 | */ |
465 | namelen = dentry->d_name.len; | |
9fe4854c DW |
466 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
467 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
468 | |
469 | if (ret) { | |
470 | jffs2_free_raw_inode(ri); | |
471 | return ret; | |
472 | } | |
473 | ||
cfc8dc6f | 474 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
475 | |
476 | if (IS_ERR(inode)) { | |
477 | jffs2_free_raw_inode(ri); | |
478 | jffs2_complete_reservation(c); | |
479 | return PTR_ERR(inode); | |
480 | } | |
481 | ||
482 | inode->i_op = &jffs2_dir_inode_operations; | |
483 | inode->i_fop = &jffs2_dir_operations; | |
1da177e4 LT |
484 | |
485 | f = JFFS2_INODE_INFO(inode); | |
486 | ||
27c72b04 | 487 | /* Directories get nlink 2 at start */ |
bfe86848 | 488 | set_nlink(inode, 2); |
27c72b04 DW |
489 | /* but ic->pino_nlink is the parent ino# */ |
490 | f->inocache->pino_nlink = dir_i->i_ino; | |
491 | ||
1da177e4 LT |
492 | ri->data_crc = cpu_to_je32(0); |
493 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 494 | |
9fe4854c | 495 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
496 | |
497 | jffs2_free_raw_inode(ri); | |
498 | ||
499 | if (IS_ERR(fn)) { | |
500 | /* Eeek. Wave bye bye */ | |
ced22070 | 501 | mutex_unlock(&f->sem); |
1da177e4 | 502 | jffs2_complete_reservation(c); |
f324e4cb DW |
503 | ret = PTR_ERR(fn); |
504 | goto fail; | |
1da177e4 | 505 | } |
182ec4ee | 506 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
507 | obsoleted by the first data write |
508 | */ | |
509 | f->metadata = fn; | |
ced22070 | 510 | mutex_unlock(&f->sem); |
1da177e4 LT |
511 | |
512 | jffs2_complete_reservation(c); | |
aa98d7cf | 513 | |
2a7dba39 | 514 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
515 | if (ret) |
516 | goto fail; | |
517 | ||
cfc8dc6f | 518 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
519 | if (ret) |
520 | goto fail; | |
aa98d7cf | 521 | |
9fe4854c DW |
522 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
523 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
524 | if (ret) |
525 | goto fail; | |
182ec4ee | 526 | |
1da177e4 LT |
527 | rd = jffs2_alloc_raw_dirent(); |
528 | if (!rd) { | |
529 | /* Argh. Now we treat it like a normal delete */ | |
530 | jffs2_complete_reservation(c); | |
f324e4cb DW |
531 | ret = -ENOMEM; |
532 | goto fail; | |
1da177e4 LT |
533 | } |
534 | ||
535 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 536 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
537 | |
538 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
539 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
540 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
541 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
542 | ||
543 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
544 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
545 | rd->ino = cpu_to_je32(inode->i_ino); | |
546 | rd->mctime = cpu_to_je32(get_seconds()); | |
547 | rd->nsize = namelen; | |
548 | rd->type = DT_DIR; | |
549 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
550 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
551 | ||
9fe4854c | 552 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 553 | |
1da177e4 | 554 | if (IS_ERR(fd)) { |
182ec4ee | 555 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
556 | as if it were the final unlink() */ |
557 | jffs2_complete_reservation(c); | |
558 | jffs2_free_raw_dirent(rd); | |
ced22070 | 559 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
560 | ret = PTR_ERR(fd); |
561 | goto fail; | |
1da177e4 LT |
562 | } |
563 | ||
95582b00 | 564 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(je32_to_cpu(rd->mctime))); |
d8c76e6f | 565 | inc_nlink(dir_i); |
1da177e4 LT |
566 | |
567 | jffs2_free_raw_dirent(rd); | |
568 | ||
569 | /* Link the fd into the inode's list, obsoleting an old | |
570 | one if necessary. */ | |
571 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
572 | ||
ced22070 | 573 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
574 | jffs2_complete_reservation(c); |
575 | ||
1e2e547a | 576 | d_instantiate_new(dentry, inode); |
1da177e4 | 577 | return 0; |
f324e4cb DW |
578 | |
579 | fail: | |
41cce647 | 580 | iget_failed(inode); |
f324e4cb | 581 | return ret; |
1da177e4 LT |
582 | } |
583 | ||
584 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) | |
585 | { | |
27c72b04 DW |
586 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
587 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); | |
2b0143b5 | 588 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); |
1da177e4 LT |
589 | struct jffs2_full_dirent *fd; |
590 | int ret; | |
27c72b04 | 591 | uint32_t now = get_seconds(); |
1da177e4 LT |
592 | |
593 | for (fd = f->dents ; fd; fd = fd->next) { | |
594 | if (fd->ino) | |
595 | return -ENOTEMPTY; | |
596 | } | |
27c72b04 DW |
597 | |
598 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, | |
599 | dentry->d_name.len, f, now); | |
600 | if (!ret) { | |
95582b00 | 601 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(now)); |
2b0143b5 | 602 | clear_nlink(d_inode(dentry)); |
9a53c3a7 | 603 | drop_nlink(dir_i); |
27c72b04 | 604 | } |
1da177e4 LT |
605 | return ret; |
606 | } | |
607 | ||
1a67aafb | 608 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
609 | { |
610 | struct jffs2_inode_info *f, *dir_f; | |
611 | struct jffs2_sb_info *c; | |
612 | struct inode *inode; | |
613 | struct jffs2_raw_inode *ri; | |
614 | struct jffs2_raw_dirent *rd; | |
615 | struct jffs2_full_dnode *fn; | |
616 | struct jffs2_full_dirent *fd; | |
617 | int namelen; | |
aef9ab47 | 618 | union jffs2_device_node dev; |
1da177e4 | 619 | int devlen = 0; |
9fe4854c | 620 | uint32_t alloclen; |
1da177e4 LT |
621 | int ret; |
622 | ||
1da177e4 LT |
623 | ri = jffs2_alloc_raw_inode(); |
624 | if (!ri) | |
625 | return -ENOMEM; | |
182ec4ee | 626 | |
1da177e4 | 627 | c = JFFS2_SB_INFO(dir_i->i_sb); |
182ec4ee | 628 | |
aef9ab47 DW |
629 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
630 | devlen = jffs2_encode_dev(&dev, rdev); | |
182ec4ee TG |
631 | |
632 | /* Try to reserve enough space for both node and dirent. | |
633 | * Just the node will do for now, though | |
1da177e4 LT |
634 | */ |
635 | namelen = dentry->d_name.len; | |
9fe4854c | 636 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
aef9ab47 | 637 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
638 | |
639 | if (ret) { | |
640 | jffs2_free_raw_inode(ri); | |
641 | return ret; | |
642 | } | |
643 | ||
cfc8dc6f | 644 | inode = jffs2_new_inode(dir_i, mode, ri); |
1da177e4 LT |
645 | |
646 | if (IS_ERR(inode)) { | |
647 | jffs2_free_raw_inode(ri); | |
648 | jffs2_complete_reservation(c); | |
649 | return PTR_ERR(inode); | |
650 | } | |
651 | inode->i_op = &jffs2_file_inode_operations; | |
652 | init_special_inode(inode, inode->i_mode, rdev); | |
653 | ||
654 | f = JFFS2_INODE_INFO(inode); | |
655 | ||
656 | ri->dsize = ri->csize = cpu_to_je32(devlen); | |
657 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); | |
658 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
659 | ||
660 | ri->compr = JFFS2_COMPR_NONE; | |
661 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); | |
662 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
182ec4ee | 663 | |
9fe4854c | 664 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
1da177e4 LT |
665 | |
666 | jffs2_free_raw_inode(ri); | |
667 | ||
668 | if (IS_ERR(fn)) { | |
669 | /* Eeek. Wave bye bye */ | |
ced22070 | 670 | mutex_unlock(&f->sem); |
1da177e4 | 671 | jffs2_complete_reservation(c); |
f324e4cb DW |
672 | ret = PTR_ERR(fn); |
673 | goto fail; | |
1da177e4 | 674 | } |
182ec4ee | 675 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
676 | obsoleted by the first data write |
677 | */ | |
678 | f->metadata = fn; | |
ced22070 | 679 | mutex_unlock(&f->sem); |
1da177e4 LT |
680 | |
681 | jffs2_complete_reservation(c); | |
aa98d7cf | 682 | |
2a7dba39 | 683 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
f324e4cb DW |
684 | if (ret) |
685 | goto fail; | |
686 | ||
cfc8dc6f | 687 | ret = jffs2_init_acl_post(inode); |
f324e4cb DW |
688 | if (ret) |
689 | goto fail; | |
aa98d7cf | 690 | |
9fe4854c DW |
691 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
692 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
f324e4cb DW |
693 | if (ret) |
694 | goto fail; | |
1da177e4 LT |
695 | |
696 | rd = jffs2_alloc_raw_dirent(); | |
697 | if (!rd) { | |
698 | /* Argh. Now we treat it like a normal delete */ | |
699 | jffs2_complete_reservation(c); | |
f324e4cb DW |
700 | ret = -ENOMEM; |
701 | goto fail; | |
1da177e4 LT |
702 | } |
703 | ||
704 | dir_f = JFFS2_INODE_INFO(dir_i); | |
ced22070 | 705 | mutex_lock(&dir_f->sem); |
1da177e4 LT |
706 | |
707 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
708 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
709 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
710 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
711 | ||
712 | rd->pino = cpu_to_je32(dir_i->i_ino); | |
713 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
714 | rd->ino = cpu_to_je32(inode->i_ino); | |
715 | rd->mctime = cpu_to_je32(get_seconds()); | |
716 | rd->nsize = namelen; | |
717 | ||
718 | /* XXX: This is ugly. */ | |
719 | rd->type = (mode & S_IFMT) >> 12; | |
720 | ||
721 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
722 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); | |
723 | ||
9fe4854c | 724 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
182ec4ee | 725 | |
1da177e4 | 726 | if (IS_ERR(fd)) { |
182ec4ee | 727 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
728 | as if it were the final unlink() */ |
729 | jffs2_complete_reservation(c); | |
730 | jffs2_free_raw_dirent(rd); | |
ced22070 | 731 | mutex_unlock(&dir_f->sem); |
f324e4cb DW |
732 | ret = PTR_ERR(fd); |
733 | goto fail; | |
1da177e4 LT |
734 | } |
735 | ||
95582b00 | 736 | dir_i->i_mtime = dir_i->i_ctime = timespec_to_timespec64(ITIME(je32_to_cpu(rd->mctime))); |
1da177e4 LT |
737 | |
738 | jffs2_free_raw_dirent(rd); | |
739 | ||
740 | /* Link the fd into the inode's list, obsoleting an old | |
741 | one if necessary. */ | |
742 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
743 | ||
ced22070 | 744 | mutex_unlock(&dir_f->sem); |
1da177e4 LT |
745 | jffs2_complete_reservation(c); |
746 | ||
1e2e547a | 747 | d_instantiate_new(dentry, inode); |
1da177e4 | 748 | return 0; |
f324e4cb DW |
749 | |
750 | fail: | |
41cce647 | 751 | iget_failed(inode); |
f324e4cb | 752 | return ret; |
1da177e4 LT |
753 | } |
754 | ||
755 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, | |
f03b8ad8 MS |
756 | struct inode *new_dir_i, struct dentry *new_dentry, |
757 | unsigned int flags) | |
1da177e4 LT |
758 | { |
759 | int ret; | |
760 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); | |
761 | struct jffs2_inode_info *victim_f = NULL; | |
762 | uint8_t type; | |
3a69e0cd | 763 | uint32_t now; |
1da177e4 | 764 | |
f03b8ad8 MS |
765 | if (flags & ~RENAME_NOREPLACE) |
766 | return -EINVAL; | |
767 | ||
182ec4ee | 768 | /* The VFS will check for us and prevent trying to rename a |
1da177e4 LT |
769 | * file over a directory and vice versa, but if it's a directory, |
770 | * the VFS can't check whether the victim is empty. The filesystem | |
771 | * needs to do that for itself. | |
772 | */ | |
2b0143b5 DH |
773 | if (d_really_is_positive(new_dentry)) { |
774 | victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); | |
e36cb0b8 | 775 | if (d_is_dir(new_dentry)) { |
1da177e4 LT |
776 | struct jffs2_full_dirent *fd; |
777 | ||
ced22070 | 778 | mutex_lock(&victim_f->sem); |
1da177e4 LT |
779 | for (fd = victim_f->dents; fd; fd = fd->next) { |
780 | if (fd->ino) { | |
ced22070 | 781 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
782 | return -ENOTEMPTY; |
783 | } | |
784 | } | |
ced22070 | 785 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
786 | } |
787 | } | |
788 | ||
789 | /* XXX: We probably ought to alloc enough space for | |
182ec4ee | 790 | both nodes at the same time. Writing the new link, |
1da177e4 LT |
791 | then getting -ENOSPC, is quite bad :) |
792 | */ | |
793 | ||
794 | /* Make a hard link */ | |
182ec4ee | 795 | |
1da177e4 | 796 | /* XXX: This is ugly */ |
2b0143b5 | 797 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
1da177e4 LT |
798 | if (!type) type = DT_REG; |
799 | ||
3a69e0cd | 800 | now = get_seconds(); |
182ec4ee | 801 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
2b0143b5 | 802 | d_inode(old_dentry)->i_ino, type, |
3a69e0cd | 803 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
1da177e4 LT |
804 | |
805 | if (ret) | |
806 | return ret; | |
807 | ||
808 | if (victim_f) { | |
809 | /* There was a victim. Kill it off nicely */ | |
e36cb0b8 | 810 | if (d_is_dir(new_dentry)) |
2b0143b5 | 811 | clear_nlink(d_inode(new_dentry)); |
22ba747f | 812 | else |
2b0143b5 | 813 | drop_nlink(d_inode(new_dentry)); |
1da177e4 LT |
814 | /* Don't oops if the victim was a dirent pointing to an |
815 | inode which didn't exist. */ | |
816 | if (victim_f->inocache) { | |
ced22070 | 817 | mutex_lock(&victim_f->sem); |
e36cb0b8 | 818 | if (d_is_dir(new_dentry)) |
27c72b04 DW |
819 | victim_f->inocache->pino_nlink = 0; |
820 | else | |
821 | victim_f->inocache->pino_nlink--; | |
ced22070 | 822 | mutex_unlock(&victim_f->sem); |
1da177e4 LT |
823 | } |
824 | } | |
825 | ||
182ec4ee | 826 | /* If it was a directory we moved, and there was no victim, |
1da177e4 | 827 | increase i_nlink on its new parent */ |
e36cb0b8 | 828 | if (d_is_dir(old_dentry) && !victim_f) |
d8c76e6f | 829 | inc_nlink(new_dir_i); |
1da177e4 LT |
830 | |
831 | /* Unlink the original */ | |
182ec4ee | 832 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
3a69e0cd | 833 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
1da177e4 LT |
834 | |
835 | /* We don't touch inode->i_nlink */ | |
836 | ||
837 | if (ret) { | |
838 | /* Oh shit. We really ought to make a single node which can do both atomically */ | |
2b0143b5 | 839 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
ced22070 | 840 | mutex_lock(&f->sem); |
2b0143b5 | 841 | inc_nlink(d_inode(old_dentry)); |
e36cb0b8 | 842 | if (f->inocache && !d_is_dir(old_dentry)) |
27c72b04 | 843 | f->inocache->pino_nlink++; |
ced22070 | 844 | mutex_unlock(&f->sem); |
1da177e4 | 845 | |
da320f05 JP |
846 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
847 | __func__, ret); | |
f9381284 AV |
848 | /* |
849 | * We can't keep the target in dcache after that. | |
850 | * For one thing, we can't afford dentry aliases for directories. | |
851 | * For another, if there was a victim, we _can't_ set new inode | |
852 | * for that sucker and we have to trigger mount eviction - the | |
853 | * caller won't do it on its own since we are returning an error. | |
854 | */ | |
855 | d_invalidate(new_dentry); | |
95582b00 | 856 | new_dir_i->i_mtime = new_dir_i->i_ctime = timespec_to_timespec64(ITIME(now)); |
1da177e4 LT |
857 | return ret; |
858 | } | |
859 | ||
e36cb0b8 | 860 | if (d_is_dir(old_dentry)) |
9a53c3a7 | 861 | drop_nlink(old_dir_i); |
1da177e4 | 862 | |
95582b00 | 863 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = timespec_to_timespec64(ITIME(now)); |
3a69e0cd | 864 | |
1da177e4 LT |
865 | return 0; |
866 | } | |
867 |