Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
62e2749e CM |
19 | #include "ctree.h" |
20 | #include "disk-io.h" | |
21 | #include "hash.h" | |
e089f05c | 22 | #include "transaction.h" |
62e2749e | 23 | |
d352ac68 CM |
24 | /* |
25 | * insert a name into a directory, doing overflow properly if there is a hash | |
26 | * collision. data_size indicates how big the item inserted should be. On | |
27 | * success a struct btrfs_dir_item pointer is returned, otherwise it is | |
28 | * an ERR_PTR. | |
29 | * | |
30 | * The name is not copied into the dir item, you have to do that yourself. | |
31 | */ | |
35b7e476 CM |
32 | static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle |
33 | *trans, | |
34 | struct btrfs_root *root, | |
35 | struct btrfs_path *path, | |
36 | struct btrfs_key *cpu_key, | |
e06afa83 CM |
37 | u32 data_size, |
38 | const char *name, | |
39 | int name_len) | |
7fcde0e3 | 40 | { |
7fcde0e3 | 41 | int ret; |
7e38180e CM |
42 | char *ptr; |
43 | struct btrfs_item *item; | |
5f39d397 | 44 | struct extent_buffer *leaf; |
7fcde0e3 CM |
45 | |
46 | ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size); | |
7e38180e | 47 | if (ret == -EEXIST) { |
e06afa83 CM |
48 | struct btrfs_dir_item *di; |
49 | di = btrfs_match_dir_item_name(root, path, name, name_len); | |
50 | if (di) | |
51 | return ERR_PTR(-EEXIST); | |
4b90c680 | 52 | btrfs_extend_item(root, path, data_size); |
143bede5 | 53 | } else if (ret < 0) |
54aa1f4d | 54 | return ERR_PTR(ret); |
7e38180e | 55 | WARN_ON(ret > 0); |
5f39d397 | 56 | leaf = path->nodes[0]; |
dd3cc16b | 57 | item = btrfs_item_nr(path->slots[0]); |
7e38180e | 58 | ptr = btrfs_item_ptr(leaf, path->slots[0], char); |
5f39d397 CM |
59 | BUG_ON(data_size > btrfs_item_size(leaf, item)); |
60 | ptr += btrfs_item_size(leaf, item) - data_size; | |
7e38180e | 61 | return (struct btrfs_dir_item *)ptr; |
7fcde0e3 CM |
62 | } |
63 | ||
d352ac68 CM |
64 | /* |
65 | * xattrs work a lot like directories, this inserts an xattr item | |
66 | * into the tree | |
67 | */ | |
5103e947 | 68 | int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, |
f34f57a3 YZ |
69 | struct btrfs_root *root, |
70 | struct btrfs_path *path, u64 objectid, | |
71 | const char *name, u16 name_len, | |
72 | const void *data, u16 data_len) | |
5103e947 JB |
73 | { |
74 | int ret = 0; | |
5103e947 JB |
75 | struct btrfs_dir_item *dir_item; |
76 | unsigned long name_ptr, data_ptr; | |
77 | struct btrfs_key key, location; | |
78 | struct btrfs_disk_key disk_key; | |
79 | struct extent_buffer *leaf; | |
80 | u32 data_size; | |
81 | ||
f34f57a3 YZ |
82 | BUG_ON(name_len + data_len > BTRFS_MAX_XATTR_SIZE(root)); |
83 | ||
84 | key.objectid = objectid; | |
962a298f | 85 | key.type = BTRFS_XATTR_ITEM_KEY; |
df68b8a7 | 86 | key.offset = btrfs_name_hash(name, name_len); |
5103e947 JB |
87 | |
88 | data_size = sizeof(*dir_item) + name_len + data_len; | |
89 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, | |
90 | name, name_len); | |
fa09200b JB |
91 | if (IS_ERR(dir_item)) |
92 | return PTR_ERR(dir_item); | |
5103e947 JB |
93 | memset(&location, 0, sizeof(location)); |
94 | ||
95 | leaf = path->nodes[0]; | |
96 | btrfs_cpu_key_to_disk(&disk_key, &location); | |
97 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); | |
98 | btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR); | |
99 | btrfs_set_dir_name_len(leaf, dir_item, name_len); | |
e02119d5 | 100 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
5103e947 JB |
101 | btrfs_set_dir_data_len(leaf, dir_item, data_len); |
102 | name_ptr = (unsigned long)(dir_item + 1); | |
103 | data_ptr = (unsigned long)((char *)name_ptr + name_len); | |
104 | ||
105 | write_extent_buffer(leaf, name, name_ptr, name_len); | |
106 | write_extent_buffer(leaf, data, data_ptr, data_len); | |
107 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
108 | ||
5103e947 JB |
109 | return ret; |
110 | } | |
111 | ||
d352ac68 CM |
112 | /* |
113 | * insert a directory item in the tree, doing all the magic for | |
114 | * both indexes. 'dir' indicates which objectid to insert it into, | |
115 | * 'location' is the key to stuff into the directory item, 'type' is the | |
116 | * type of the inode we're pointing to, and 'index' is the sequence number | |
117 | * to use for the second index (if one is created). | |
79787eaa | 118 | * Will return 0 or -ENOMEM |
d352ac68 | 119 | */ |
e089f05c | 120 | int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root |
16cdcec7 MX |
121 | *root, const char *name, int name_len, |
122 | struct inode *dir, struct btrfs_key *location, | |
123 | u8 type, u64 index) | |
62e2749e CM |
124 | { |
125 | int ret = 0; | |
e06afa83 | 126 | int ret2 = 0; |
5caf2a00 | 127 | struct btrfs_path *path; |
62e2749e | 128 | struct btrfs_dir_item *dir_item; |
5f39d397 CM |
129 | struct extent_buffer *leaf; |
130 | unsigned long name_ptr; | |
62e2749e | 131 | struct btrfs_key key; |
5f39d397 | 132 | struct btrfs_disk_key disk_key; |
62e2749e CM |
133 | u32 data_size; |
134 | ||
0d0ca30f | 135 | key.objectid = btrfs_ino(dir); |
962a298f | 136 | key.type = BTRFS_DIR_ITEM_KEY; |
df68b8a7 | 137 | key.offset = btrfs_name_hash(name, name_len); |
b9473439 | 138 | |
5caf2a00 | 139 | path = btrfs_alloc_path(); |
16cdcec7 MX |
140 | if (!path) |
141 | return -ENOMEM; | |
b9473439 CM |
142 | path->leave_spinning = 1; |
143 | ||
16cdcec7 MX |
144 | btrfs_cpu_key_to_disk(&disk_key, location); |
145 | ||
62e2749e | 146 | data_size = sizeof(*dir_item) + name_len; |
e06afa83 CM |
147 | dir_item = insert_with_overflow(trans, root, path, &key, data_size, |
148 | name, name_len); | |
7e38180e CM |
149 | if (IS_ERR(dir_item)) { |
150 | ret = PTR_ERR(dir_item); | |
e06afa83 CM |
151 | if (ret == -EEXIST) |
152 | goto second_insert; | |
c2db1073 | 153 | goto out_free; |
7e38180e | 154 | } |
62e2749e | 155 | |
5f39d397 | 156 | leaf = path->nodes[0]; |
5f39d397 CM |
157 | btrfs_set_dir_item_key(leaf, dir_item, &disk_key); |
158 | btrfs_set_dir_type(leaf, dir_item, type); | |
5103e947 | 159 | btrfs_set_dir_data_len(leaf, dir_item, 0); |
5f39d397 | 160 | btrfs_set_dir_name_len(leaf, dir_item, name_len); |
e02119d5 | 161 | btrfs_set_dir_transid(leaf, dir_item, trans->transid); |
5f39d397 | 162 | name_ptr = (unsigned long)(dir_item + 1); |
c5739bba | 163 | |
5f39d397 CM |
164 | write_extent_buffer(leaf, name, name_ptr, name_len); |
165 | btrfs_mark_buffer_dirty(leaf); | |
7e38180e | 166 | |
e06afa83 | 167 | second_insert: |
7e38180e CM |
168 | /* FIXME, use some real flag for selecting the extra index */ |
169 | if (root == root->fs_info->tree_root) { | |
170 | ret = 0; | |
c2db1073 | 171 | goto out_free; |
7e38180e | 172 | } |
b3b4aa74 | 173 | btrfs_release_path(path); |
7e38180e | 174 | |
16cdcec7 MX |
175 | ret2 = btrfs_insert_delayed_dir_index(trans, root, name, name_len, dir, |
176 | &disk_key, type, index); | |
c2db1073 | 177 | out_free: |
5caf2a00 | 178 | btrfs_free_path(path); |
e06afa83 CM |
179 | if (ret) |
180 | return ret; | |
181 | if (ret2) | |
182 | return ret2; | |
183 | return 0; | |
62e2749e CM |
184 | } |
185 | ||
d352ac68 CM |
186 | /* |
187 | * lookup a directory item based on name. 'dir' is the objectid | |
188 | * we're searching in, and 'mod' tells us if you plan on deleting the | |
189 | * item (use mod < 0) or changing the options (use mod > 0) | |
190 | */ | |
7e38180e CM |
191 | struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, |
192 | struct btrfs_root *root, | |
193 | struct btrfs_path *path, u64 dir, | |
194 | const char *name, int name_len, | |
195 | int mod) | |
62e2749e | 196 | { |
1d4f6404 | 197 | int ret; |
62e2749e | 198 | struct btrfs_key key; |
1d4f6404 CM |
199 | int ins_len = mod < 0 ? -1 : 0; |
200 | int cow = mod != 0; | |
62e2749e CM |
201 | |
202 | key.objectid = dir; | |
962a298f | 203 | key.type = BTRFS_DIR_ITEM_KEY; |
5f39d397 | 204 | |
df68b8a7 | 205 | key.offset = btrfs_name_hash(name, name_len); |
5f39d397 | 206 | |
7e38180e CM |
207 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
208 | if (ret < 0) | |
209 | return ERR_PTR(ret); | |
85d85a74 | 210 | if (ret > 0) |
7e38180e CM |
211 | return NULL; |
212 | ||
213 | return btrfs_match_dir_item_name(root, path, name, name_len); | |
62e2749e CM |
214 | } |
215 | ||
9c52057c CM |
216 | int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, |
217 | const char *name, int name_len) | |
218 | { | |
219 | int ret; | |
220 | struct btrfs_key key; | |
221 | struct btrfs_dir_item *di; | |
222 | int data_size; | |
223 | struct extent_buffer *leaf; | |
224 | int slot; | |
225 | struct btrfs_path *path; | |
226 | ||
227 | ||
228 | path = btrfs_alloc_path(); | |
229 | if (!path) | |
230 | return -ENOMEM; | |
231 | ||
232 | key.objectid = dir; | |
962a298f | 233 | key.type = BTRFS_DIR_ITEM_KEY; |
9c52057c CM |
234 | key.offset = btrfs_name_hash(name, name_len); |
235 | ||
236 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
237 | ||
238 | /* return back any errors */ | |
239 | if (ret < 0) | |
240 | goto out; | |
241 | ||
242 | /* nothing found, we're safe */ | |
243 | if (ret > 0) { | |
244 | ret = 0; | |
245 | goto out; | |
246 | } | |
247 | ||
248 | /* we found an item, look for our name in the item */ | |
249 | di = btrfs_match_dir_item_name(root, path, name, name_len); | |
250 | if (di) { | |
251 | /* our exact name was found */ | |
252 | ret = -EEXIST; | |
253 | goto out; | |
254 | } | |
255 | ||
256 | /* | |
257 | * see if there is room in the item to insert this | |
258 | * name | |
259 | */ | |
878f2d2c | 260 | data_size = sizeof(*di) + name_len; |
9c52057c CM |
261 | leaf = path->nodes[0]; |
262 | slot = path->slots[0]; | |
263 | if (data_size + btrfs_item_size_nr(leaf, slot) + | |
264 | sizeof(struct btrfs_item) > BTRFS_LEAF_DATA_SIZE(root)) { | |
265 | ret = -EOVERFLOW; | |
266 | } else { | |
267 | /* plenty of insertion room */ | |
268 | ret = 0; | |
269 | } | |
270 | out: | |
271 | btrfs_free_path(path); | |
272 | return ret; | |
273 | } | |
274 | ||
d352ac68 CM |
275 | /* |
276 | * lookup a directory item based on index. 'dir' is the objectid | |
277 | * we're searching in, and 'mod' tells us if you plan on deleting the | |
278 | * item (use mod < 0) or changing the options (use mod > 0) | |
279 | * | |
280 | * The name is used to make sure the index really points to the name you were | |
281 | * looking for. | |
282 | */ | |
7e38180e CM |
283 | struct btrfs_dir_item * |
284 | btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, | |
285 | struct btrfs_root *root, | |
286 | struct btrfs_path *path, u64 dir, | |
287 | u64 objectid, const char *name, int name_len, | |
288 | int mod) | |
289 | { | |
290 | int ret; | |
291 | struct btrfs_key key; | |
292 | int ins_len = mod < 0 ? -1 : 0; | |
293 | int cow = mod != 0; | |
294 | ||
295 | key.objectid = dir; | |
962a298f | 296 | key.type = BTRFS_DIR_INDEX_KEY; |
7e38180e CM |
297 | key.offset = objectid; |
298 | ||
299 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); | |
300 | if (ret < 0) | |
301 | return ERR_PTR(ret); | |
302 | if (ret > 0) | |
303 | return ERR_PTR(-ENOENT); | |
304 | return btrfs_match_dir_item_name(root, path, name, name_len); | |
305 | } | |
306 | ||
4df27c4d YZ |
307 | struct btrfs_dir_item * |
308 | btrfs_search_dir_index_item(struct btrfs_root *root, | |
309 | struct btrfs_path *path, u64 dirid, | |
310 | const char *name, int name_len) | |
311 | { | |
312 | struct extent_buffer *leaf; | |
313 | struct btrfs_dir_item *di; | |
314 | struct btrfs_key key; | |
315 | u32 nritems; | |
316 | int ret; | |
317 | ||
318 | key.objectid = dirid; | |
319 | key.type = BTRFS_DIR_INDEX_KEY; | |
320 | key.offset = 0; | |
321 | ||
322 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
323 | if (ret < 0) | |
324 | return ERR_PTR(ret); | |
325 | ||
326 | leaf = path->nodes[0]; | |
327 | nritems = btrfs_header_nritems(leaf); | |
328 | ||
329 | while (1) { | |
330 | if (path->slots[0] >= nritems) { | |
331 | ret = btrfs_next_leaf(root, path); | |
332 | if (ret < 0) | |
333 | return ERR_PTR(ret); | |
334 | if (ret > 0) | |
335 | break; | |
336 | leaf = path->nodes[0]; | |
337 | nritems = btrfs_header_nritems(leaf); | |
338 | continue; | |
339 | } | |
340 | ||
341 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
342 | if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) | |
343 | break; | |
344 | ||
345 | di = btrfs_match_dir_item_name(root, path, name, name_len); | |
346 | if (di) | |
347 | return di; | |
348 | ||
349 | path->slots[0]++; | |
350 | } | |
351 | return NULL; | |
352 | } | |
353 | ||
5103e947 JB |
354 | struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, |
355 | struct btrfs_root *root, | |
356 | struct btrfs_path *path, u64 dir, | |
357 | const char *name, u16 name_len, | |
358 | int mod) | |
359 | { | |
360 | int ret; | |
361 | struct btrfs_key key; | |
362 | int ins_len = mod < 0 ? -1 : 0; | |
363 | int cow = mod != 0; | |
5103e947 JB |
364 | |
365 | key.objectid = dir; | |
962a298f | 366 | key.type = BTRFS_XATTR_ITEM_KEY; |
df68b8a7 | 367 | key.offset = btrfs_name_hash(name, name_len); |
5103e947 JB |
368 | ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow); |
369 | if (ret < 0) | |
370 | return ERR_PTR(ret); | |
85d85a74 | 371 | if (ret > 0) |
5103e947 JB |
372 | return NULL; |
373 | ||
374 | return btrfs_match_dir_item_name(root, path, name, name_len); | |
375 | } | |
376 | ||
d352ac68 CM |
377 | /* |
378 | * helper function to look at the directory item pointed to by 'path' | |
379 | * this walks through all the entries in a dir item and finds one | |
380 | * for a specific name. | |
381 | */ | |
5f5bc6b1 FM |
382 | struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, |
383 | struct btrfs_path *path, | |
384 | const char *name, int name_len) | |
62e2749e | 385 | { |
62e2749e | 386 | struct btrfs_dir_item *dir_item; |
5f39d397 | 387 | unsigned long name_ptr; |
7e38180e CM |
388 | u32 total_len; |
389 | u32 cur = 0; | |
390 | u32 this_len; | |
5f39d397 | 391 | struct extent_buffer *leaf; |
a8a2ee0c | 392 | |
5f39d397 | 393 | leaf = path->nodes[0]; |
7e38180e | 394 | dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); |
22a94d44 JB |
395 | if (verify_dir_item(root, leaf, dir_item)) |
396 | return NULL; | |
397 | ||
5f39d397 | 398 | total_len = btrfs_item_size_nr(leaf, path->slots[0]); |
d397712b | 399 | while (cur < total_len) { |
5f39d397 | 400 | this_len = sizeof(*dir_item) + |
5103e947 JB |
401 | btrfs_dir_name_len(leaf, dir_item) + |
402 | btrfs_dir_data_len(leaf, dir_item); | |
5f39d397 | 403 | name_ptr = (unsigned long)(dir_item + 1); |
7e38180e | 404 | |
5f39d397 CM |
405 | if (btrfs_dir_name_len(leaf, dir_item) == name_len && |
406 | memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) | |
7e38180e CM |
407 | return dir_item; |
408 | ||
409 | cur += this_len; | |
410 | dir_item = (struct btrfs_dir_item *)((char *)dir_item + | |
411 | this_len); | |
412 | } | |
413 | return NULL; | |
62e2749e | 414 | } |
7e38180e | 415 | |
d352ac68 CM |
416 | /* |
417 | * given a pointer into a directory item, delete it. This | |
418 | * handles items that have more than one entry in them. | |
419 | */ | |
7e38180e CM |
420 | int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, |
421 | struct btrfs_root *root, | |
422 | struct btrfs_path *path, | |
423 | struct btrfs_dir_item *di) | |
424 | { | |
425 | ||
5f39d397 | 426 | struct extent_buffer *leaf; |
7e38180e CM |
427 | u32 sub_item_len; |
428 | u32 item_len; | |
54aa1f4d | 429 | int ret = 0; |
7e38180e | 430 | |
5f39d397 | 431 | leaf = path->nodes[0]; |
5103e947 JB |
432 | sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) + |
433 | btrfs_dir_data_len(leaf, di); | |
5f39d397 CM |
434 | item_len = btrfs_item_size_nr(leaf, path->slots[0]); |
435 | if (sub_item_len == item_len) { | |
7e38180e | 436 | ret = btrfs_del_item(trans, root, path); |
7e38180e | 437 | } else { |
5f39d397 CM |
438 | /* MARKER */ |
439 | unsigned long ptr = (unsigned long)di; | |
440 | unsigned long start; | |
441 | ||
442 | start = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
443 | memmove_extent_buffer(leaf, ptr, ptr + sub_item_len, | |
7e38180e | 444 | item_len - (ptr + sub_item_len - start)); |
afe5fea7 | 445 | btrfs_truncate_item(root, path, item_len - sub_item_len, 1); |
7e38180e | 446 | } |
411fc6bc | 447 | return ret; |
7e38180e | 448 | } |
22a94d44 JB |
449 | |
450 | int verify_dir_item(struct btrfs_root *root, | |
451 | struct extent_buffer *leaf, | |
452 | struct btrfs_dir_item *dir_item) | |
453 | { | |
454 | u16 namelen = BTRFS_NAME_LEN; | |
455 | u8 type = btrfs_dir_type(leaf, dir_item); | |
456 | ||
457 | if (type >= BTRFS_FT_MAX) { | |
efe120a0 | 458 | btrfs_crit(root->fs_info, "invalid dir item type: %d", |
22a94d44 JB |
459 | (int)type); |
460 | return 1; | |
461 | } | |
462 | ||
463 | if (type == BTRFS_FT_XATTR) | |
464 | namelen = XATTR_NAME_MAX; | |
465 | ||
466 | if (btrfs_dir_name_len(leaf, dir_item) > namelen) { | |
efe120a0 | 467 | btrfs_crit(root->fs_info, "invalid dir item name len: %u", |
22a94d44 JB |
468 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
469 | return 1; | |
470 | } | |
471 | ||
472 | /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */ | |
e46f5388 FDBM |
473 | if ((btrfs_dir_data_len(leaf, dir_item) + |
474 | btrfs_dir_name_len(leaf, dir_item)) > BTRFS_MAX_XATTR_SIZE(root)) { | |
efe120a0 | 475 | btrfs_crit(root->fs_info, "invalid dir item name + data len: %u + %u", |
e46f5388 | 476 | (unsigned)btrfs_dir_name_len(leaf, dir_item), |
22a94d44 JB |
477 | (unsigned)btrfs_dir_data_len(leaf, dir_item)); |
478 | return 1; | |
479 | } | |
480 | ||
481 | return 0; | |
482 | } |