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67cf5b09 TM |
1 | /* |
2 | * Copyright (c) 2012 Taobao. | |
3 | * Written by Tao Ma <boyu.mt@taobao.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | #include "ext4_jbd2.h" | |
15 | #include "ext4.h" | |
16 | #include "xattr.h" | |
f19d5870 | 17 | #include "truncate.h" |
94191985 | 18 | #include <linux/fiemap.h> |
67cf5b09 TM |
19 | |
20 | #define EXT4_XATTR_SYSTEM_DATA "data" | |
21 | #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) | |
8af0f082 TM |
22 | #define EXT4_INLINE_DOTDOT_OFFSET 2 |
23 | #define EXT4_INLINE_DOTDOT_SIZE 4 | |
67cf5b09 TM |
24 | |
25 | int ext4_get_inline_size(struct inode *inode) | |
26 | { | |
27 | if (EXT4_I(inode)->i_inline_off) | |
28 | return EXT4_I(inode)->i_inline_size; | |
29 | ||
30 | return 0; | |
31 | } | |
32 | ||
33 | static int get_max_inline_xattr_value_size(struct inode *inode, | |
34 | struct ext4_iloc *iloc) | |
35 | { | |
36 | struct ext4_xattr_ibody_header *header; | |
37 | struct ext4_xattr_entry *entry; | |
38 | struct ext4_inode *raw_inode; | |
39 | int free, min_offs; | |
40 | ||
41 | min_offs = EXT4_SB(inode->i_sb)->s_inode_size - | |
42 | EXT4_GOOD_OLD_INODE_SIZE - | |
43 | EXT4_I(inode)->i_extra_isize - | |
44 | sizeof(struct ext4_xattr_ibody_header); | |
45 | ||
46 | /* | |
47 | * We need to subtract another sizeof(__u32) since an in-inode xattr | |
48 | * needs an empty 4 bytes to indicate the gap between the xattr entry | |
49 | * and the name/value pair. | |
50 | */ | |
51 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) | |
52 | return EXT4_XATTR_SIZE(min_offs - | |
53 | EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - | |
54 | EXT4_XATTR_ROUND - sizeof(__u32)); | |
55 | ||
56 | raw_inode = ext4_raw_inode(iloc); | |
57 | header = IHDR(inode, raw_inode); | |
58 | entry = IFIRST(header); | |
59 | ||
60 | /* Compute min_offs. */ | |
61 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { | |
62 | if (!entry->e_value_block && entry->e_value_size) { | |
63 | size_t offs = le16_to_cpu(entry->e_value_offs); | |
64 | if (offs < min_offs) | |
65 | min_offs = offs; | |
66 | } | |
67 | } | |
68 | free = min_offs - | |
69 | ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); | |
70 | ||
71 | if (EXT4_I(inode)->i_inline_off) { | |
72 | entry = (struct ext4_xattr_entry *) | |
73 | ((void *)raw_inode + EXT4_I(inode)->i_inline_off); | |
74 | ||
75 | free += le32_to_cpu(entry->e_value_size); | |
76 | goto out; | |
77 | } | |
78 | ||
79 | free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); | |
80 | ||
81 | if (free > EXT4_XATTR_ROUND) | |
82 | free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); | |
83 | else | |
84 | free = 0; | |
85 | ||
86 | out: | |
87 | return free; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Get the maximum size we now can store in an inode. | |
92 | * If we can't find the space for a xattr entry, don't use the space | |
93 | * of the extents since we have no space to indicate the inline data. | |
94 | */ | |
95 | int ext4_get_max_inline_size(struct inode *inode) | |
96 | { | |
97 | int error, max_inline_size; | |
98 | struct ext4_iloc iloc; | |
99 | ||
100 | if (EXT4_I(inode)->i_extra_isize == 0) | |
101 | return 0; | |
102 | ||
103 | error = ext4_get_inode_loc(inode, &iloc); | |
104 | if (error) { | |
105 | ext4_error_inode(inode, __func__, __LINE__, 0, | |
106 | "can't get inode location %lu", | |
107 | inode->i_ino); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | down_read(&EXT4_I(inode)->xattr_sem); | |
112 | max_inline_size = get_max_inline_xattr_value_size(inode, &iloc); | |
113 | up_read(&EXT4_I(inode)->xattr_sem); | |
114 | ||
115 | brelse(iloc.bh); | |
116 | ||
117 | if (!max_inline_size) | |
118 | return 0; | |
119 | ||
120 | return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; | |
121 | } | |
122 | ||
123 | int ext4_has_inline_data(struct inode *inode) | |
124 | { | |
125 | return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && | |
126 | EXT4_I(inode)->i_inline_off; | |
127 | } | |
128 | ||
129 | /* | |
130 | * this function does not take xattr_sem, which is OK because it is | |
131 | * currently only used in a code path coming form ext4_iget, before | |
132 | * the new inode has been unlocked | |
133 | */ | |
134 | int ext4_find_inline_data_nolock(struct inode *inode) | |
135 | { | |
136 | struct ext4_xattr_ibody_find is = { | |
137 | .s = { .not_found = -ENODATA, }, | |
138 | }; | |
139 | struct ext4_xattr_info i = { | |
140 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
141 | .name = EXT4_XATTR_SYSTEM_DATA, | |
142 | }; | |
143 | int error; | |
144 | ||
145 | if (EXT4_I(inode)->i_extra_isize == 0) | |
146 | return 0; | |
147 | ||
148 | error = ext4_get_inode_loc(inode, &is.iloc); | |
149 | if (error) | |
150 | return error; | |
151 | ||
152 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
153 | if (error) | |
154 | goto out; | |
155 | ||
156 | if (!is.s.not_found) { | |
157 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
158 | (void *)ext4_raw_inode(&is.iloc)); | |
159 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
160 | le32_to_cpu(is.s.here->e_value_size); | |
161 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
162 | } | |
163 | out: | |
164 | brelse(is.iloc.bh); | |
165 | return error; | |
166 | } | |
167 | ||
168 | static int ext4_read_inline_data(struct inode *inode, void *buffer, | |
169 | unsigned int len, | |
170 | struct ext4_iloc *iloc) | |
171 | { | |
172 | struct ext4_xattr_entry *entry; | |
173 | struct ext4_xattr_ibody_header *header; | |
174 | int cp_len = 0; | |
175 | struct ext4_inode *raw_inode; | |
176 | ||
177 | if (!len) | |
178 | return 0; | |
179 | ||
180 | BUG_ON(len > EXT4_I(inode)->i_inline_size); | |
181 | ||
182 | cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? | |
183 | len : EXT4_MIN_INLINE_DATA_SIZE; | |
184 | ||
185 | raw_inode = ext4_raw_inode(iloc); | |
186 | memcpy(buffer, (void *)(raw_inode->i_block), cp_len); | |
187 | ||
188 | len -= cp_len; | |
189 | buffer += cp_len; | |
190 | ||
191 | if (!len) | |
192 | goto out; | |
193 | ||
194 | header = IHDR(inode, raw_inode); | |
195 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
196 | EXT4_I(inode)->i_inline_off); | |
197 | len = min_t(unsigned int, len, | |
198 | (unsigned int)le32_to_cpu(entry->e_value_size)); | |
199 | ||
200 | memcpy(buffer, | |
201 | (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); | |
202 | cp_len += len; | |
203 | ||
204 | out: | |
205 | return cp_len; | |
206 | } | |
207 | ||
208 | /* | |
209 | * write the buffer to the inline inode. | |
210 | * If 'create' is set, we don't need to do the extra copy in the xattr | |
0d812f77 TM |
211 | * value since it is already handled by ext4_xattr_ibody_inline_set. |
212 | * That saves us one memcpy. | |
67cf5b09 TM |
213 | */ |
214 | void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, | |
215 | void *buffer, loff_t pos, unsigned int len) | |
216 | { | |
217 | struct ext4_xattr_entry *entry; | |
218 | struct ext4_xattr_ibody_header *header; | |
219 | struct ext4_inode *raw_inode; | |
220 | int cp_len = 0; | |
221 | ||
222 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
223 | BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); | |
224 | ||
225 | raw_inode = ext4_raw_inode(iloc); | |
226 | buffer += pos; | |
227 | ||
228 | if (pos < EXT4_MIN_INLINE_DATA_SIZE) { | |
229 | cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? | |
230 | EXT4_MIN_INLINE_DATA_SIZE - pos : len; | |
231 | memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); | |
232 | ||
233 | len -= cp_len; | |
234 | buffer += cp_len; | |
235 | pos += cp_len; | |
236 | } | |
237 | ||
238 | if (!len) | |
239 | return; | |
240 | ||
241 | pos -= EXT4_MIN_INLINE_DATA_SIZE; | |
242 | header = IHDR(inode, raw_inode); | |
243 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
244 | EXT4_I(inode)->i_inline_off); | |
245 | ||
246 | memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, | |
247 | buffer, len); | |
248 | } | |
249 | ||
250 | static int ext4_create_inline_data(handle_t *handle, | |
251 | struct inode *inode, unsigned len) | |
252 | { | |
253 | int error; | |
254 | void *value = NULL; | |
255 | struct ext4_xattr_ibody_find is = { | |
256 | .s = { .not_found = -ENODATA, }, | |
257 | }; | |
258 | struct ext4_xattr_info i = { | |
259 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
260 | .name = EXT4_XATTR_SYSTEM_DATA, | |
261 | }; | |
262 | ||
263 | error = ext4_get_inode_loc(inode, &is.iloc); | |
264 | if (error) | |
265 | return error; | |
266 | ||
267 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
268 | if (error) | |
269 | goto out; | |
270 | ||
271 | if (len > EXT4_MIN_INLINE_DATA_SIZE) { | |
bd9926e8 | 272 | value = EXT4_ZERO_XATTR_VALUE; |
67cf5b09 TM |
273 | len -= EXT4_MIN_INLINE_DATA_SIZE; |
274 | } else { | |
275 | value = ""; | |
276 | len = 0; | |
277 | } | |
278 | ||
279 | /* Insert the the xttr entry. */ | |
280 | i.value = value; | |
281 | i.value_len = len; | |
282 | ||
283 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
284 | if (error) | |
285 | goto out; | |
286 | ||
287 | BUG_ON(!is.s.not_found); | |
288 | ||
0d812f77 | 289 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
290 | if (error) { |
291 | if (error == -ENOSPC) | |
292 | ext4_clear_inode_state(inode, | |
293 | EXT4_STATE_MAY_INLINE_DATA); | |
294 | goto out; | |
295 | } | |
296 | ||
297 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
298 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
299 | ||
300 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
301 | (void *)ext4_raw_inode(&is.iloc)); | |
302 | EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; | |
303 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
304 | ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
305 | get_bh(is.iloc.bh); | |
306 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
307 | ||
308 | out: | |
309 | brelse(is.iloc.bh); | |
310 | return error; | |
311 | } | |
312 | ||
313 | static int ext4_update_inline_data(handle_t *handle, struct inode *inode, | |
314 | unsigned int len) | |
315 | { | |
316 | int error; | |
317 | void *value = NULL; | |
318 | struct ext4_xattr_ibody_find is = { | |
319 | .s = { .not_found = -ENODATA, }, | |
320 | }; | |
321 | struct ext4_xattr_info i = { | |
322 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
323 | .name = EXT4_XATTR_SYSTEM_DATA, | |
324 | }; | |
325 | ||
326 | /* If the old space is ok, write the data directly. */ | |
327 | if (len <= EXT4_I(inode)->i_inline_size) | |
328 | return 0; | |
329 | ||
330 | error = ext4_get_inode_loc(inode, &is.iloc); | |
331 | if (error) | |
332 | return error; | |
333 | ||
334 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
335 | if (error) | |
336 | goto out; | |
337 | ||
338 | BUG_ON(is.s.not_found); | |
339 | ||
340 | len -= EXT4_MIN_INLINE_DATA_SIZE; | |
341 | value = kzalloc(len, GFP_NOFS); | |
342 | if (!value) | |
343 | goto out; | |
344 | ||
345 | error = ext4_xattr_ibody_get(inode, i.name_index, i.name, | |
346 | value, len); | |
347 | if (error == -ENODATA) | |
348 | goto out; | |
349 | ||
350 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
351 | if (error) | |
352 | goto out; | |
353 | ||
354 | /* Update the xttr entry. */ | |
355 | i.value = value; | |
356 | i.value_len = len; | |
357 | ||
0d812f77 | 358 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
359 | if (error) |
360 | goto out; | |
361 | ||
362 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
363 | (void *)ext4_raw_inode(&is.iloc)); | |
364 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
365 | le32_to_cpu(is.s.here->e_value_size); | |
366 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
367 | get_bh(is.iloc.bh); | |
368 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
369 | ||
370 | out: | |
371 | kfree(value); | |
372 | brelse(is.iloc.bh); | |
373 | return error; | |
374 | } | |
375 | ||
376 | int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, | |
377 | unsigned int len) | |
378 | { | |
379 | int ret, size; | |
380 | struct ext4_inode_info *ei = EXT4_I(inode); | |
381 | ||
382 | if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) | |
383 | return -ENOSPC; | |
384 | ||
385 | size = ext4_get_max_inline_size(inode); | |
386 | if (size < len) | |
387 | return -ENOSPC; | |
388 | ||
389 | down_write(&EXT4_I(inode)->xattr_sem); | |
390 | ||
391 | if (ei->i_inline_off) | |
392 | ret = ext4_update_inline_data(handle, inode, len); | |
393 | else | |
394 | ret = ext4_create_inline_data(handle, inode, len); | |
395 | ||
396 | up_write(&EXT4_I(inode)->xattr_sem); | |
397 | ||
398 | return ret; | |
399 | } | |
400 | ||
401 | static int ext4_destroy_inline_data_nolock(handle_t *handle, | |
402 | struct inode *inode) | |
403 | { | |
404 | struct ext4_inode_info *ei = EXT4_I(inode); | |
405 | struct ext4_xattr_ibody_find is = { | |
406 | .s = { .not_found = 0, }, | |
407 | }; | |
408 | struct ext4_xattr_info i = { | |
409 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
410 | .name = EXT4_XATTR_SYSTEM_DATA, | |
411 | .value = NULL, | |
412 | .value_len = 0, | |
413 | }; | |
414 | int error; | |
415 | ||
416 | if (!ei->i_inline_off) | |
417 | return 0; | |
418 | ||
419 | error = ext4_get_inode_loc(inode, &is.iloc); | |
420 | if (error) | |
421 | return error; | |
422 | ||
423 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
424 | if (error) | |
425 | goto out; | |
426 | ||
427 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
428 | if (error) | |
429 | goto out; | |
430 | ||
0d812f77 | 431 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
432 | if (error) |
433 | goto out; | |
434 | ||
435 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
436 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
437 | ||
438 | if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
439 | EXT4_FEATURE_INCOMPAT_EXTENTS)) { | |
440 | if (S_ISDIR(inode->i_mode) || | |
441 | S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { | |
442 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); | |
443 | ext4_ext_tree_init(handle, inode); | |
444 | } | |
445 | } | |
446 | ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
447 | ||
448 | get_bh(is.iloc.bh); | |
449 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
450 | ||
451 | EXT4_I(inode)->i_inline_off = 0; | |
452 | EXT4_I(inode)->i_inline_size = 0; | |
453 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
454 | out: | |
455 | brelse(is.iloc.bh); | |
456 | if (error == -ENODATA) | |
457 | error = 0; | |
458 | return error; | |
459 | } | |
460 | ||
46c7f254 TM |
461 | static int ext4_read_inline_page(struct inode *inode, struct page *page) |
462 | { | |
463 | void *kaddr; | |
464 | int ret = 0; | |
465 | size_t len; | |
466 | struct ext4_iloc iloc; | |
467 | ||
468 | BUG_ON(!PageLocked(page)); | |
469 | BUG_ON(!ext4_has_inline_data(inode)); | |
470 | BUG_ON(page->index); | |
471 | ||
472 | if (!EXT4_I(inode)->i_inline_off) { | |
473 | ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", | |
474 | inode->i_ino); | |
475 | goto out; | |
476 | } | |
477 | ||
478 | ret = ext4_get_inode_loc(inode, &iloc); | |
479 | if (ret) | |
480 | goto out; | |
481 | ||
482 | len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); | |
483 | kaddr = kmap_atomic(page); | |
484 | ret = ext4_read_inline_data(inode, kaddr, len, &iloc); | |
485 | flush_dcache_page(page); | |
486 | kunmap_atomic(kaddr); | |
487 | zero_user_segment(page, len, PAGE_CACHE_SIZE); | |
488 | SetPageUptodate(page); | |
489 | brelse(iloc.bh); | |
490 | ||
491 | out: | |
492 | return ret; | |
493 | } | |
494 | ||
495 | int ext4_readpage_inline(struct inode *inode, struct page *page) | |
496 | { | |
497 | int ret = 0; | |
498 | ||
499 | down_read(&EXT4_I(inode)->xattr_sem); | |
500 | if (!ext4_has_inline_data(inode)) { | |
501 | up_read(&EXT4_I(inode)->xattr_sem); | |
502 | return -EAGAIN; | |
503 | } | |
504 | ||
505 | /* | |
506 | * Current inline data can only exist in the 1st page, | |
507 | * So for all the other pages, just set them uptodate. | |
508 | */ | |
509 | if (!page->index) | |
510 | ret = ext4_read_inline_page(inode, page); | |
511 | else if (!PageUptodate(page)) { | |
512 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
513 | SetPageUptodate(page); | |
514 | } | |
515 | ||
516 | up_read(&EXT4_I(inode)->xattr_sem); | |
517 | ||
518 | unlock_page(page); | |
519 | return ret >= 0 ? 0 : ret; | |
520 | } | |
521 | ||
f19d5870 TM |
522 | static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
523 | struct inode *inode, | |
524 | unsigned flags) | |
525 | { | |
526 | int ret, needed_blocks; | |
527 | handle_t *handle = NULL; | |
528 | int retries = 0, sem_held = 0; | |
529 | struct page *page = NULL; | |
530 | unsigned from, to; | |
531 | struct ext4_iloc iloc; | |
532 | ||
533 | if (!ext4_has_inline_data(inode)) { | |
534 | /* | |
535 | * clear the flag so that no new write | |
536 | * will trap here again. | |
537 | */ | |
538 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
539 | return 0; | |
540 | } | |
541 | ||
542 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
543 | ||
544 | ret = ext4_get_inode_loc(inode, &iloc); | |
545 | if (ret) | |
546 | return ret; | |
547 | ||
548 | retry: | |
9924a92a | 549 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
f19d5870 TM |
550 | if (IS_ERR(handle)) { |
551 | ret = PTR_ERR(handle); | |
552 | handle = NULL; | |
553 | goto out; | |
554 | } | |
555 | ||
556 | /* We cannot recurse into the filesystem as the transaction is already | |
557 | * started */ | |
558 | flags |= AOP_FLAG_NOFS; | |
559 | ||
560 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
561 | if (!page) { | |
562 | ret = -ENOMEM; | |
563 | goto out; | |
564 | } | |
565 | ||
566 | down_write(&EXT4_I(inode)->xattr_sem); | |
567 | sem_held = 1; | |
568 | /* If some one has already done this for us, just exit. */ | |
569 | if (!ext4_has_inline_data(inode)) { | |
570 | ret = 0; | |
571 | goto out; | |
572 | } | |
573 | ||
574 | from = 0; | |
575 | to = ext4_get_inline_size(inode); | |
576 | if (!PageUptodate(page)) { | |
577 | ret = ext4_read_inline_page(inode, page); | |
578 | if (ret < 0) | |
579 | goto out; | |
580 | } | |
581 | ||
582 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
583 | if (ret) | |
584 | goto out; | |
585 | ||
586 | if (ext4_should_dioread_nolock(inode)) | |
587 | ret = __block_write_begin(page, from, to, ext4_get_block_write); | |
588 | else | |
589 | ret = __block_write_begin(page, from, to, ext4_get_block); | |
590 | ||
591 | if (!ret && ext4_should_journal_data(inode)) { | |
592 | ret = ext4_walk_page_buffers(handle, page_buffers(page), | |
593 | from, to, NULL, | |
594 | do_journal_get_write_access); | |
595 | } | |
596 | ||
597 | if (ret) { | |
598 | unlock_page(page); | |
599 | page_cache_release(page); | |
600 | ext4_orphan_add(handle, inode); | |
601 | up_write(&EXT4_I(inode)->xattr_sem); | |
602 | sem_held = 0; | |
603 | ext4_journal_stop(handle); | |
604 | handle = NULL; | |
605 | ext4_truncate_failed_write(inode); | |
606 | /* | |
607 | * If truncate failed early the inode might | |
608 | * still be on the orphan list; we need to | |
609 | * make sure the inode is removed from the | |
610 | * orphan list in that case. | |
611 | */ | |
612 | if (inode->i_nlink) | |
613 | ext4_orphan_del(NULL, inode); | |
614 | } | |
615 | ||
616 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
617 | goto retry; | |
618 | ||
619 | block_commit_write(page, from, to); | |
620 | out: | |
621 | if (page) { | |
622 | unlock_page(page); | |
623 | page_cache_release(page); | |
624 | } | |
625 | if (sem_held) | |
626 | up_write(&EXT4_I(inode)->xattr_sem); | |
627 | if (handle) | |
628 | ext4_journal_stop(handle); | |
629 | brelse(iloc.bh); | |
630 | return ret; | |
631 | } | |
632 | ||
633 | /* | |
634 | * Try to write data in the inode. | |
635 | * If the inode has inline data, check whether the new write can be | |
636 | * in the inode also. If not, create the page the handle, move the data | |
637 | * to the page make it update and let the later codes create extent for it. | |
638 | */ | |
639 | int ext4_try_to_write_inline_data(struct address_space *mapping, | |
640 | struct inode *inode, | |
641 | loff_t pos, unsigned len, | |
642 | unsigned flags, | |
643 | struct page **pagep) | |
644 | { | |
645 | int ret; | |
646 | handle_t *handle; | |
647 | struct page *page; | |
648 | struct ext4_iloc iloc; | |
649 | ||
650 | if (pos + len > ext4_get_max_inline_size(inode)) | |
651 | goto convert; | |
652 | ||
653 | ret = ext4_get_inode_loc(inode, &iloc); | |
654 | if (ret) | |
655 | return ret; | |
656 | ||
657 | /* | |
658 | * The possible write could happen in the inode, | |
659 | * so try to reserve the space in inode first. | |
660 | */ | |
9924a92a | 661 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
f19d5870 TM |
662 | if (IS_ERR(handle)) { |
663 | ret = PTR_ERR(handle); | |
664 | handle = NULL; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
669 | if (ret && ret != -ENOSPC) | |
670 | goto out; | |
671 | ||
672 | /* We don't have space in inline inode, so convert it to extent. */ | |
673 | if (ret == -ENOSPC) { | |
674 | ext4_journal_stop(handle); | |
675 | brelse(iloc.bh); | |
676 | goto convert; | |
677 | } | |
678 | ||
679 | flags |= AOP_FLAG_NOFS; | |
680 | ||
681 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
682 | if (!page) { | |
683 | ret = -ENOMEM; | |
684 | goto out; | |
685 | } | |
686 | ||
687 | *pagep = page; | |
688 | down_read(&EXT4_I(inode)->xattr_sem); | |
689 | if (!ext4_has_inline_data(inode)) { | |
690 | ret = 0; | |
691 | unlock_page(page); | |
692 | page_cache_release(page); | |
693 | goto out_up_read; | |
694 | } | |
695 | ||
696 | if (!PageUptodate(page)) { | |
697 | ret = ext4_read_inline_page(inode, page); | |
698 | if (ret < 0) | |
699 | goto out_up_read; | |
700 | } | |
701 | ||
702 | ret = 1; | |
703 | handle = NULL; | |
704 | out_up_read: | |
705 | up_read(&EXT4_I(inode)->xattr_sem); | |
706 | out: | |
707 | if (handle) | |
708 | ext4_journal_stop(handle); | |
709 | brelse(iloc.bh); | |
710 | return ret; | |
711 | convert: | |
712 | return ext4_convert_inline_data_to_extent(mapping, | |
713 | inode, flags); | |
714 | } | |
715 | ||
716 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, | |
717 | unsigned copied, struct page *page) | |
718 | { | |
719 | int ret; | |
720 | void *kaddr; | |
721 | struct ext4_iloc iloc; | |
722 | ||
723 | if (unlikely(copied < len)) { | |
724 | if (!PageUptodate(page)) { | |
725 | copied = 0; | |
726 | goto out; | |
727 | } | |
728 | } | |
729 | ||
730 | ret = ext4_get_inode_loc(inode, &iloc); | |
731 | if (ret) { | |
732 | ext4_std_error(inode->i_sb, ret); | |
733 | copied = 0; | |
734 | goto out; | |
735 | } | |
736 | ||
737 | down_write(&EXT4_I(inode)->xattr_sem); | |
738 | BUG_ON(!ext4_has_inline_data(inode)); | |
739 | ||
740 | kaddr = kmap_atomic(page); | |
741 | ext4_write_inline_data(inode, &iloc, kaddr, pos, len); | |
742 | kunmap_atomic(kaddr); | |
743 | SetPageUptodate(page); | |
744 | /* clear page dirty so that writepages wouldn't work for us. */ | |
745 | ClearPageDirty(page); | |
746 | ||
747 | up_write(&EXT4_I(inode)->xattr_sem); | |
748 | brelse(iloc.bh); | |
749 | out: | |
750 | return copied; | |
751 | } | |
752 | ||
3fdcfb66 TM |
753 | struct buffer_head * |
754 | ext4_journalled_write_inline_data(struct inode *inode, | |
755 | unsigned len, | |
756 | struct page *page) | |
757 | { | |
758 | int ret; | |
759 | void *kaddr; | |
760 | struct ext4_iloc iloc; | |
761 | ||
762 | ret = ext4_get_inode_loc(inode, &iloc); | |
763 | if (ret) { | |
764 | ext4_std_error(inode->i_sb, ret); | |
765 | return NULL; | |
766 | } | |
767 | ||
768 | down_write(&EXT4_I(inode)->xattr_sem); | |
769 | kaddr = kmap_atomic(page); | |
770 | ext4_write_inline_data(inode, &iloc, kaddr, 0, len); | |
771 | kunmap_atomic(kaddr); | |
772 | up_write(&EXT4_I(inode)->xattr_sem); | |
773 | ||
774 | return iloc.bh; | |
775 | } | |
776 | ||
9c3569b5 TM |
777 | /* |
778 | * Try to make the page cache and handle ready for the inline data case. | |
779 | * We can call this function in 2 cases: | |
780 | * 1. The inode is created and the first write exceeds inline size. We can | |
781 | * clear the inode state safely. | |
782 | * 2. The inode has inline data, then we need to read the data, make it | |
783 | * update and dirty so that ext4_da_writepages can handle it. We don't | |
784 | * need to start the journal since the file's metatdata isn't changed now. | |
785 | */ | |
786 | static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, | |
787 | struct inode *inode, | |
788 | unsigned flags, | |
789 | void **fsdata) | |
790 | { | |
791 | int ret = 0, inline_size; | |
792 | struct page *page; | |
793 | ||
794 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
795 | if (!page) | |
796 | return -ENOMEM; | |
797 | ||
798 | down_read(&EXT4_I(inode)->xattr_sem); | |
799 | if (!ext4_has_inline_data(inode)) { | |
800 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
801 | goto out; | |
802 | } | |
803 | ||
804 | inline_size = ext4_get_inline_size(inode); | |
805 | ||
806 | if (!PageUptodate(page)) { | |
807 | ret = ext4_read_inline_page(inode, page); | |
808 | if (ret < 0) | |
809 | goto out; | |
810 | } | |
811 | ||
812 | ret = __block_write_begin(page, 0, inline_size, | |
813 | ext4_da_get_block_prep); | |
814 | if (ret) { | |
815 | ext4_truncate_failed_write(inode); | |
816 | goto out; | |
817 | } | |
818 | ||
819 | SetPageDirty(page); | |
820 | SetPageUptodate(page); | |
821 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
822 | *fsdata = (void *)CONVERT_INLINE_DATA; | |
823 | ||
824 | out: | |
825 | up_read(&EXT4_I(inode)->xattr_sem); | |
826 | if (page) { | |
827 | unlock_page(page); | |
828 | page_cache_release(page); | |
829 | } | |
830 | return ret; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Prepare the write for the inline data. | |
835 | * If the the data can be written into the inode, we just read | |
836 | * the page and make it uptodate, and start the journal. | |
837 | * Otherwise read the page, makes it dirty so that it can be | |
838 | * handle in writepages(the i_disksize update is left to the | |
839 | * normal ext4_da_write_end). | |
840 | */ | |
841 | int ext4_da_write_inline_data_begin(struct address_space *mapping, | |
842 | struct inode *inode, | |
843 | loff_t pos, unsigned len, | |
844 | unsigned flags, | |
845 | struct page **pagep, | |
846 | void **fsdata) | |
847 | { | |
848 | int ret, inline_size; | |
849 | handle_t *handle; | |
850 | struct page *page; | |
851 | struct ext4_iloc iloc; | |
852 | ||
853 | ret = ext4_get_inode_loc(inode, &iloc); | |
854 | if (ret) | |
855 | return ret; | |
856 | ||
9924a92a | 857 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
9c3569b5 TM |
858 | if (IS_ERR(handle)) { |
859 | ret = PTR_ERR(handle); | |
860 | handle = NULL; | |
861 | goto out; | |
862 | } | |
863 | ||
864 | inline_size = ext4_get_max_inline_size(inode); | |
865 | ||
866 | ret = -ENOSPC; | |
867 | if (inline_size >= pos + len) { | |
868 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
869 | if (ret && ret != -ENOSPC) | |
870 | goto out; | |
871 | } | |
872 | ||
873 | if (ret == -ENOSPC) { | |
874 | ret = ext4_da_convert_inline_data_to_extent(mapping, | |
875 | inode, | |
876 | flags, | |
877 | fsdata); | |
878 | goto out; | |
879 | } | |
880 | ||
881 | /* | |
882 | * We cannot recurse into the filesystem as the transaction | |
883 | * is already started. | |
884 | */ | |
885 | flags |= AOP_FLAG_NOFS; | |
886 | ||
887 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
888 | if (!page) { | |
889 | ret = -ENOMEM; | |
890 | goto out; | |
891 | } | |
892 | ||
893 | down_read(&EXT4_I(inode)->xattr_sem); | |
894 | if (!ext4_has_inline_data(inode)) { | |
895 | ret = 0; | |
896 | goto out_release_page; | |
897 | } | |
898 | ||
899 | if (!PageUptodate(page)) { | |
900 | ret = ext4_read_inline_page(inode, page); | |
901 | if (ret < 0) | |
902 | goto out_release_page; | |
903 | } | |
904 | ||
905 | up_read(&EXT4_I(inode)->xattr_sem); | |
906 | *pagep = page; | |
907 | handle = NULL; | |
908 | brelse(iloc.bh); | |
909 | return 1; | |
910 | out_release_page: | |
911 | up_read(&EXT4_I(inode)->xattr_sem); | |
912 | unlock_page(page); | |
913 | page_cache_release(page); | |
914 | out: | |
915 | if (handle) | |
916 | ext4_journal_stop(handle); | |
917 | brelse(iloc.bh); | |
918 | return ret; | |
919 | } | |
920 | ||
921 | int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, | |
922 | unsigned len, unsigned copied, | |
923 | struct page *page) | |
924 | { | |
925 | int i_size_changed = 0; | |
926 | ||
927 | copied = ext4_write_inline_data_end(inode, pos, len, copied, page); | |
928 | ||
929 | /* | |
930 | * No need to use i_size_read() here, the i_size | |
931 | * cannot change under us because we hold i_mutex. | |
932 | * | |
933 | * But it's important to update i_size while still holding page lock: | |
934 | * page writeout could otherwise come in and zero beyond i_size. | |
935 | */ | |
936 | if (pos+copied > inode->i_size) { | |
937 | i_size_write(inode, pos+copied); | |
938 | i_size_changed = 1; | |
939 | } | |
940 | unlock_page(page); | |
941 | page_cache_release(page); | |
942 | ||
943 | /* | |
944 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
945 | * makes the holding time of page lock longer. Second, it forces lock | |
946 | * ordering of page lock and transaction start for journaling | |
947 | * filesystems. | |
948 | */ | |
949 | if (i_size_changed) | |
950 | mark_inode_dirty(inode); | |
951 | ||
952 | return copied; | |
953 | } | |
f19d5870 | 954 | |
3c47d541 TM |
955 | #ifdef INLINE_DIR_DEBUG |
956 | void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, | |
957 | void *inline_start, int inline_size) | |
958 | { | |
959 | int offset; | |
960 | unsigned short de_len; | |
961 | struct ext4_dir_entry_2 *de = inline_start; | |
962 | void *dlimit = inline_start + inline_size; | |
963 | ||
964 | trace_printk("inode %lu\n", dir->i_ino); | |
965 | offset = 0; | |
966 | while ((void *)de < dlimit) { | |
967 | de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); | |
968 | trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n", | |
969 | offset, de_len, de->name_len, de->name, | |
970 | de->name_len, le32_to_cpu(de->inode)); | |
971 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
972 | inline_start, inline_size, offset)) | |
973 | BUG(); | |
974 | ||
975 | offset += de_len; | |
976 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); | |
977 | } | |
978 | } | |
979 | #else | |
980 | #define ext4_show_inline_dir(dir, bh, inline_start, inline_size) | |
981 | #endif | |
982 | ||
983 | /* | |
984 | * Add a new entry into a inline dir. | |
985 | * It will return -ENOSPC if no space is available, and -EIO | |
986 | * and -EEXIST if directory entry already exists. | |
987 | */ | |
988 | static int ext4_add_dirent_to_inline(handle_t *handle, | |
989 | struct dentry *dentry, | |
990 | struct inode *inode, | |
991 | struct ext4_iloc *iloc, | |
992 | void *inline_start, int inline_size) | |
993 | { | |
994 | struct inode *dir = dentry->d_parent->d_inode; | |
995 | const char *name = dentry->d_name.name; | |
996 | int namelen = dentry->d_name.len; | |
997 | unsigned short reclen; | |
998 | int err; | |
999 | struct ext4_dir_entry_2 *de; | |
1000 | ||
1001 | reclen = EXT4_DIR_REC_LEN(namelen); | |
1002 | err = ext4_find_dest_de(dir, inode, iloc->bh, | |
1003 | inline_start, inline_size, | |
1004 | name, namelen, &de); | |
1005 | if (err) | |
1006 | return err; | |
1007 | ||
1008 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
1009 | if (err) | |
1010 | return err; | |
1011 | ext4_insert_dentry(inode, de, inline_size, name, namelen); | |
1012 | ||
1013 | ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); | |
1014 | ||
1015 | /* | |
1016 | * XXX shouldn't update any times until successful | |
1017 | * completion of syscall, but too many callers depend | |
1018 | * on this. | |
1019 | * | |
1020 | * XXX similarly, too many callers depend on | |
1021 | * ext4_new_inode() setting the times, but error | |
1022 | * recovery deletes the inode, so the worst that can | |
1023 | * happen is that the times are slightly out of date | |
1024 | * and/or different from the directory change time. | |
1025 | */ | |
1026 | dir->i_mtime = dir->i_ctime = ext4_current_time(dir); | |
1027 | ext4_update_dx_flag(dir); | |
1028 | dir->i_version++; | |
1029 | ext4_mark_inode_dirty(handle, dir); | |
1030 | return 1; | |
1031 | } | |
1032 | ||
1033 | static void *ext4_get_inline_xattr_pos(struct inode *inode, | |
1034 | struct ext4_iloc *iloc) | |
1035 | { | |
1036 | struct ext4_xattr_entry *entry; | |
1037 | struct ext4_xattr_ibody_header *header; | |
1038 | ||
1039 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
1040 | ||
1041 | header = IHDR(inode, ext4_raw_inode(iloc)); | |
1042 | entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + | |
1043 | EXT4_I(inode)->i_inline_off); | |
1044 | ||
1045 | return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); | |
1046 | } | |
1047 | ||
1048 | /* Set the final de to cover the whole block. */ | |
1049 | static void ext4_update_final_de(void *de_buf, int old_size, int new_size) | |
1050 | { | |
1051 | struct ext4_dir_entry_2 *de, *prev_de; | |
1052 | void *limit; | |
1053 | int de_len; | |
1054 | ||
1055 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1056 | if (old_size) { | |
1057 | limit = de_buf + old_size; | |
1058 | do { | |
1059 | prev_de = de; | |
1060 | de_len = ext4_rec_len_from_disk(de->rec_len, old_size); | |
1061 | de_buf += de_len; | |
1062 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1063 | } while (de_buf < limit); | |
1064 | ||
1065 | prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - | |
1066 | old_size, new_size); | |
1067 | } else { | |
1068 | /* this is just created, so create an empty entry. */ | |
1069 | de->inode = 0; | |
1070 | de->rec_len = ext4_rec_len_to_disk(new_size, new_size); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, | |
1075 | struct ext4_iloc *iloc) | |
1076 | { | |
1077 | int ret; | |
1078 | int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; | |
1079 | int new_size = get_max_inline_xattr_value_size(dir, iloc); | |
1080 | ||
1081 | if (new_size - old_size <= EXT4_DIR_REC_LEN(1)) | |
1082 | return -ENOSPC; | |
1083 | ||
1084 | ret = ext4_update_inline_data(handle, dir, | |
1085 | new_size + EXT4_MIN_INLINE_DATA_SIZE); | |
1086 | if (ret) | |
1087 | return ret; | |
1088 | ||
1089 | ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, | |
1090 | EXT4_I(dir)->i_inline_size - | |
1091 | EXT4_MIN_INLINE_DATA_SIZE); | |
1092 | dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, | |
1097 | struct ext4_iloc *iloc, | |
1098 | void *buf, int inline_size) | |
1099 | { | |
1100 | ext4_create_inline_data(handle, inode, inline_size); | |
1101 | ext4_write_inline_data(inode, iloc, buf, 0, inline_size); | |
1102 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1103 | } | |
1104 | ||
1105 | static int ext4_finish_convert_inline_dir(handle_t *handle, | |
1106 | struct inode *inode, | |
1107 | struct buffer_head *dir_block, | |
1108 | void *buf, | |
1109 | int inline_size) | |
1110 | { | |
1111 | int err, csum_size = 0, header_size = 0; | |
1112 | struct ext4_dir_entry_2 *de; | |
1113 | struct ext4_dir_entry_tail *t; | |
1114 | void *target = dir_block->b_data; | |
1115 | ||
1116 | /* | |
1117 | * First create "." and ".." and then copy the dir information | |
1118 | * back to the block. | |
1119 | */ | |
1120 | de = (struct ext4_dir_entry_2 *)target; | |
1121 | de = ext4_init_dot_dotdot(inode, de, | |
1122 | inode->i_sb->s_blocksize, csum_size, | |
1123 | le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); | |
1124 | header_size = (void *)de - target; | |
1125 | ||
1126 | memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, | |
1127 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1128 | ||
1129 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
1130 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
1131 | csum_size = sizeof(struct ext4_dir_entry_tail); | |
1132 | ||
1133 | inode->i_size = inode->i_sb->s_blocksize; | |
1134 | i_size_write(inode, inode->i_sb->s_blocksize); | |
1135 | EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; | |
1136 | ext4_update_final_de(dir_block->b_data, | |
1137 | inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, | |
1138 | inode->i_sb->s_blocksize - csum_size); | |
1139 | ||
1140 | if (csum_size) { | |
1141 | t = EXT4_DIRENT_TAIL(dir_block->b_data, | |
1142 | inode->i_sb->s_blocksize); | |
1143 | initialize_dirent_tail(t, inode->i_sb->s_blocksize); | |
1144 | } | |
1145 | set_buffer_uptodate(dir_block); | |
1146 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
1147 | if (err) | |
1148 | goto out; | |
1149 | set_buffer_verified(dir_block); | |
1150 | out: | |
1151 | return err; | |
1152 | } | |
1153 | ||
1154 | static int ext4_convert_inline_data_nolock(handle_t *handle, | |
1155 | struct inode *inode, | |
1156 | struct ext4_iloc *iloc) | |
1157 | { | |
1158 | int error; | |
1159 | void *buf = NULL; | |
1160 | struct buffer_head *data_bh = NULL; | |
1161 | struct ext4_map_blocks map; | |
1162 | int inline_size; | |
1163 | ||
1164 | inline_size = ext4_get_inline_size(inode); | |
1165 | buf = kmalloc(inline_size, GFP_NOFS); | |
1166 | if (!buf) { | |
1167 | error = -ENOMEM; | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | error = ext4_read_inline_data(inode, buf, inline_size, iloc); | |
1172 | if (error < 0) | |
1173 | goto out; | |
1174 | ||
1175 | error = ext4_destroy_inline_data_nolock(handle, inode); | |
1176 | if (error) | |
1177 | goto out; | |
1178 | ||
1179 | map.m_lblk = 0; | |
1180 | map.m_len = 1; | |
1181 | map.m_flags = 0; | |
1182 | error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE); | |
1183 | if (error < 0) | |
1184 | goto out_restore; | |
1185 | if (!(map.m_flags & EXT4_MAP_MAPPED)) { | |
1186 | error = -EIO; | |
1187 | goto out_restore; | |
1188 | } | |
1189 | ||
1190 | data_bh = sb_getblk(inode->i_sb, map.m_pblk); | |
1191 | if (!data_bh) { | |
860d21e2 | 1192 | error = -ENOMEM; |
3c47d541 TM |
1193 | goto out_restore; |
1194 | } | |
1195 | ||
1196 | lock_buffer(data_bh); | |
1197 | error = ext4_journal_get_create_access(handle, data_bh); | |
1198 | if (error) { | |
1199 | unlock_buffer(data_bh); | |
1200 | error = -EIO; | |
1201 | goto out_restore; | |
1202 | } | |
1203 | memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); | |
1204 | ||
1205 | if (!S_ISDIR(inode->i_mode)) { | |
1206 | memcpy(data_bh->b_data, buf, inline_size); | |
1207 | set_buffer_uptodate(data_bh); | |
1208 | error = ext4_handle_dirty_metadata(handle, | |
1209 | inode, data_bh); | |
1210 | } else { | |
1211 | error = ext4_finish_convert_inline_dir(handle, inode, data_bh, | |
1212 | buf, inline_size); | |
1213 | } | |
1214 | ||
1215 | unlock_buffer(data_bh); | |
1216 | out_restore: | |
1217 | if (error) | |
1218 | ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); | |
1219 | ||
1220 | out: | |
1221 | brelse(data_bh); | |
1222 | kfree(buf); | |
1223 | return error; | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Try to add the new entry to the inline data. | |
1228 | * If succeeds, return 0. If not, extended the inline dir and copied data to | |
1229 | * the new created block. | |
1230 | */ | |
1231 | int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, | |
1232 | struct inode *inode) | |
1233 | { | |
1234 | int ret, inline_size; | |
1235 | void *inline_start; | |
1236 | struct ext4_iloc iloc; | |
1237 | struct inode *dir = dentry->d_parent->d_inode; | |
1238 | ||
1239 | ret = ext4_get_inode_loc(dir, &iloc); | |
1240 | if (ret) | |
1241 | return ret; | |
1242 | ||
1243 | down_write(&EXT4_I(dir)->xattr_sem); | |
1244 | if (!ext4_has_inline_data(dir)) | |
1245 | goto out; | |
1246 | ||
1247 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1248 | EXT4_INLINE_DOTDOT_SIZE; | |
1249 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
1250 | ||
1251 | ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc, | |
1252 | inline_start, inline_size); | |
1253 | if (ret != -ENOSPC) | |
1254 | goto out; | |
1255 | ||
1256 | /* check whether it can be inserted to inline xattr space. */ | |
1257 | inline_size = EXT4_I(dir)->i_inline_size - | |
1258 | EXT4_MIN_INLINE_DATA_SIZE; | |
1259 | if (!inline_size) { | |
1260 | /* Try to use the xattr space.*/ | |
1261 | ret = ext4_update_inline_dir(handle, dir, &iloc); | |
1262 | if (ret && ret != -ENOSPC) | |
1263 | goto out; | |
1264 | ||
1265 | inline_size = EXT4_I(dir)->i_inline_size - | |
1266 | EXT4_MIN_INLINE_DATA_SIZE; | |
1267 | } | |
1268 | ||
1269 | if (inline_size) { | |
1270 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1271 | ||
1272 | ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc, | |
1273 | inline_start, inline_size); | |
1274 | ||
1275 | if (ret != -ENOSPC) | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * The inline space is filled up, so create a new block for it. | |
1281 | * As the extent tree will be created, we have to save the inline | |
1282 | * dir first. | |
1283 | */ | |
1284 | ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); | |
1285 | ||
1286 | out: | |
1287 | ext4_mark_inode_dirty(handle, dir); | |
1288 | up_write(&EXT4_I(dir)->xattr_sem); | |
1289 | brelse(iloc.bh); | |
1290 | return ret; | |
1291 | } | |
1292 | ||
8af0f082 TM |
1293 | /* |
1294 | * This function fills a red-black tree with information from an | |
1295 | * inlined dir. It returns the number directory entries loaded | |
1296 | * into the tree. If there is an error it is returned in err. | |
1297 | */ | |
1298 | int htree_inlinedir_to_tree(struct file *dir_file, | |
1299 | struct inode *dir, ext4_lblk_t block, | |
1300 | struct dx_hash_info *hinfo, | |
1301 | __u32 start_hash, __u32 start_minor_hash, | |
1302 | int *has_inline_data) | |
1303 | { | |
1304 | int err = 0, count = 0; | |
1305 | unsigned int parent_ino; | |
1306 | int pos; | |
1307 | struct ext4_dir_entry_2 *de; | |
1308 | struct inode *inode = file_inode(dir_file); | |
1309 | int ret, inline_size = 0; | |
1310 | struct ext4_iloc iloc; | |
1311 | void *dir_buf = NULL; | |
1312 | struct ext4_dir_entry_2 fake; | |
1313 | ||
1314 | ret = ext4_get_inode_loc(inode, &iloc); | |
1315 | if (ret) | |
1316 | return ret; | |
1317 | ||
1318 | down_read(&EXT4_I(inode)->xattr_sem); | |
1319 | if (!ext4_has_inline_data(inode)) { | |
1320 | up_read(&EXT4_I(inode)->xattr_sem); | |
1321 | *has_inline_data = 0; | |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | inline_size = ext4_get_inline_size(inode); | |
1326 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1327 | if (!dir_buf) { | |
1328 | ret = -ENOMEM; | |
1329 | up_read(&EXT4_I(inode)->xattr_sem); | |
1330 | goto out; | |
1331 | } | |
1332 | ||
1333 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1334 | up_read(&EXT4_I(inode)->xattr_sem); | |
1335 | if (ret < 0) | |
1336 | goto out; | |
1337 | ||
1338 | pos = 0; | |
1339 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); | |
1340 | while (pos < inline_size) { | |
1341 | /* | |
1342 | * As inlined dir doesn't store any information about '.' and | |
1343 | * only the inode number of '..' is stored, we have to handle | |
1344 | * them differently. | |
1345 | */ | |
1346 | if (pos == 0) { | |
1347 | fake.inode = cpu_to_le32(inode->i_ino); | |
1348 | fake.name_len = 1; | |
1349 | strcpy(fake.name, "."); | |
1350 | fake.rec_len = ext4_rec_len_to_disk( | |
1351 | EXT4_DIR_REC_LEN(fake.name_len), | |
1352 | inline_size); | |
1353 | ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); | |
1354 | de = &fake; | |
1355 | pos = EXT4_INLINE_DOTDOT_OFFSET; | |
1356 | } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { | |
1357 | fake.inode = cpu_to_le32(parent_ino); | |
1358 | fake.name_len = 2; | |
1359 | strcpy(fake.name, ".."); | |
1360 | fake.rec_len = ext4_rec_len_to_disk( | |
1361 | EXT4_DIR_REC_LEN(fake.name_len), | |
1362 | inline_size); | |
1363 | ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); | |
1364 | de = &fake; | |
1365 | pos = EXT4_INLINE_DOTDOT_SIZE; | |
1366 | } else { | |
1367 | de = (struct ext4_dir_entry_2 *)(dir_buf + pos); | |
1368 | pos += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1369 | if (ext4_check_dir_entry(inode, dir_file, de, | |
1370 | iloc.bh, dir_buf, | |
1371 | inline_size, pos)) { | |
1372 | ret = count; | |
1373 | goto out; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | ext4fs_dirhash(de->name, de->name_len, hinfo); | |
1378 | if ((hinfo->hash < start_hash) || | |
1379 | ((hinfo->hash == start_hash) && | |
1380 | (hinfo->minor_hash < start_minor_hash))) | |
1381 | continue; | |
1382 | if (de->inode == 0) | |
1383 | continue; | |
1384 | err = ext4_htree_store_dirent(dir_file, | |
1385 | hinfo->hash, hinfo->minor_hash, de); | |
1386 | if (err) { | |
1387 | count = err; | |
1388 | goto out; | |
1389 | } | |
1390 | count++; | |
1391 | } | |
1392 | ret = count; | |
1393 | out: | |
1394 | kfree(dir_buf); | |
1395 | brelse(iloc.bh); | |
1396 | return ret; | |
1397 | } | |
1398 | ||
c4d8b023 TM |
1399 | /* |
1400 | * So this function is called when the volume is mkfsed with | |
1401 | * dir_index disabled. In order to keep f_pos persistent | |
1402 | * after we convert from an inlined dir to a blocked based, | |
1403 | * we just pretend that we are a normal dir and return the | |
1404 | * offset as if '.' and '..' really take place. | |
1405 | * | |
1406 | */ | |
65d165d9 TM |
1407 | int ext4_read_inline_dir(struct file *filp, |
1408 | void *dirent, filldir_t filldir, | |
1409 | int *has_inline_data) | |
1410 | { | |
1411 | int error = 0; | |
1412 | unsigned int offset, parent_ino; | |
1413 | int i, stored; | |
1414 | struct ext4_dir_entry_2 *de; | |
1415 | struct super_block *sb; | |
496ad9aa | 1416 | struct inode *inode = file_inode(filp); |
65d165d9 TM |
1417 | int ret, inline_size = 0; |
1418 | struct ext4_iloc iloc; | |
1419 | void *dir_buf = NULL; | |
c4d8b023 | 1420 | int dotdot_offset, dotdot_size, extra_offset, extra_size; |
65d165d9 TM |
1421 | |
1422 | ret = ext4_get_inode_loc(inode, &iloc); | |
1423 | if (ret) | |
1424 | return ret; | |
1425 | ||
1426 | down_read(&EXT4_I(inode)->xattr_sem); | |
1427 | if (!ext4_has_inline_data(inode)) { | |
1428 | up_read(&EXT4_I(inode)->xattr_sem); | |
1429 | *has_inline_data = 0; | |
1430 | goto out; | |
1431 | } | |
1432 | ||
1433 | inline_size = ext4_get_inline_size(inode); | |
1434 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1435 | if (!dir_buf) { | |
1436 | ret = -ENOMEM; | |
1437 | up_read(&EXT4_I(inode)->xattr_sem); | |
1438 | goto out; | |
1439 | } | |
1440 | ||
1441 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1442 | up_read(&EXT4_I(inode)->xattr_sem); | |
1443 | if (ret < 0) | |
1444 | goto out; | |
1445 | ||
1446 | sb = inode->i_sb; | |
1447 | stored = 0; | |
1448 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); | |
c4d8b023 TM |
1449 | offset = filp->f_pos; |
1450 | ||
1451 | /* | |
1452 | * dotdot_offset and dotdot_size is the real offset and | |
1453 | * size for ".." and "." if the dir is block based while | |
1454 | * the real size for them are only EXT4_INLINE_DOTDOT_SIZE. | |
1455 | * So we will use extra_offset and extra_size to indicate them | |
1456 | * during the inline dir iteration. | |
1457 | */ | |
1458 | dotdot_offset = EXT4_DIR_REC_LEN(1); | |
1459 | dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2); | |
1460 | extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; | |
1461 | extra_size = extra_offset + inline_size; | |
65d165d9 | 1462 | |
c4d8b023 | 1463 | while (!error && !stored && filp->f_pos < extra_size) { |
65d165d9 TM |
1464 | revalidate: |
1465 | /* | |
1466 | * If the version has changed since the last call to | |
1467 | * readdir(2), then we might be pointing to an invalid | |
1468 | * dirent right now. Scan from the start of the inline | |
1469 | * dir to make sure. | |
1470 | */ | |
1471 | if (filp->f_version != inode->i_version) { | |
c4d8b023 TM |
1472 | for (i = 0; i < extra_size && i < offset;) { |
1473 | /* | |
1474 | * "." is with offset 0 and | |
1475 | * ".." is dotdot_offset. | |
1476 | */ | |
65d165d9 | 1477 | if (!i) { |
c4d8b023 TM |
1478 | i = dotdot_offset; |
1479 | continue; | |
1480 | } else if (i == dotdot_offset) { | |
1481 | i = dotdot_size; | |
65d165d9 TM |
1482 | continue; |
1483 | } | |
c4d8b023 TM |
1484 | /* for other entry, the real offset in |
1485 | * the buf has to be tuned accordingly. | |
1486 | */ | |
65d165d9 | 1487 | de = (struct ext4_dir_entry_2 *) |
c4d8b023 | 1488 | (dir_buf + i - extra_offset); |
65d165d9 TM |
1489 | /* It's too expensive to do a full |
1490 | * dirent test each time round this | |
1491 | * loop, but we do have to test at | |
1492 | * least that it is non-zero. A | |
1493 | * failure will be detected in the | |
1494 | * dirent test below. */ | |
1495 | if (ext4_rec_len_from_disk(de->rec_len, | |
c4d8b023 | 1496 | extra_size) < EXT4_DIR_REC_LEN(1)) |
65d165d9 TM |
1497 | break; |
1498 | i += ext4_rec_len_from_disk(de->rec_len, | |
c4d8b023 | 1499 | extra_size); |
65d165d9 TM |
1500 | } |
1501 | offset = i; | |
1502 | filp->f_pos = offset; | |
1503 | filp->f_version = inode->i_version; | |
1504 | } | |
1505 | ||
c4d8b023 | 1506 | while (!error && filp->f_pos < extra_size) { |
65d165d9 TM |
1507 | if (filp->f_pos == 0) { |
1508 | error = filldir(dirent, ".", 1, 0, inode->i_ino, | |
1509 | DT_DIR); | |
1510 | if (error) | |
1511 | break; | |
1512 | stored++; | |
c4d8b023 TM |
1513 | filp->f_pos = dotdot_offset; |
1514 | continue; | |
1515 | } | |
65d165d9 | 1516 | |
c4d8b023 TM |
1517 | if (filp->f_pos == dotdot_offset) { |
1518 | error = filldir(dirent, "..", 2, | |
1519 | dotdot_offset, | |
1520 | parent_ino, DT_DIR); | |
65d165d9 TM |
1521 | if (error) |
1522 | break; | |
1523 | stored++; | |
1524 | ||
c4d8b023 | 1525 | filp->f_pos = dotdot_size; |
65d165d9 TM |
1526 | continue; |
1527 | } | |
1528 | ||
c4d8b023 TM |
1529 | de = (struct ext4_dir_entry_2 *) |
1530 | (dir_buf + filp->f_pos - extra_offset); | |
65d165d9 TM |
1531 | if (ext4_check_dir_entry(inode, filp, de, |
1532 | iloc.bh, dir_buf, | |
c4d8b023 | 1533 | extra_size, filp->f_pos)) { |
65d165d9 TM |
1534 | ret = stored; |
1535 | goto out; | |
1536 | } | |
65d165d9 TM |
1537 | if (le32_to_cpu(de->inode)) { |
1538 | /* We might block in the next section | |
1539 | * if the data destination is | |
1540 | * currently swapped out. So, use a | |
1541 | * version stamp to detect whether or | |
1542 | * not the directory has been modified | |
1543 | * during the copy operation. | |
1544 | */ | |
1545 | u64 version = filp->f_version; | |
1546 | ||
1547 | error = filldir(dirent, de->name, | |
1548 | de->name_len, | |
1549 | filp->f_pos, | |
1550 | le32_to_cpu(de->inode), | |
1551 | get_dtype(sb, de->file_type)); | |
1552 | if (error) | |
1553 | break; | |
1554 | if (version != filp->f_version) | |
1555 | goto revalidate; | |
1556 | stored++; | |
1557 | } | |
1558 | filp->f_pos += ext4_rec_len_from_disk(de->rec_len, | |
c4d8b023 | 1559 | extra_size); |
65d165d9 | 1560 | } |
65d165d9 TM |
1561 | } |
1562 | out: | |
1563 | kfree(dir_buf); | |
1564 | brelse(iloc.bh); | |
1565 | return ret; | |
1566 | } | |
1567 | ||
32f7f22c TM |
1568 | struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
1569 | struct ext4_dir_entry_2 **parent_de, | |
1570 | int *retval) | |
1571 | { | |
1572 | struct ext4_iloc iloc; | |
1573 | ||
1574 | *retval = ext4_get_inode_loc(inode, &iloc); | |
1575 | if (*retval) | |
1576 | return NULL; | |
1577 | ||
1578 | *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1579 | ||
1580 | return iloc.bh; | |
1581 | } | |
1582 | ||
3c47d541 TM |
1583 | /* |
1584 | * Try to create the inline data for the new dir. | |
1585 | * If it succeeds, return 0, otherwise return the error. | |
1586 | * In case of ENOSPC, the caller should create the normal disk layout dir. | |
1587 | */ | |
1588 | int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, | |
1589 | struct inode *inode) | |
1590 | { | |
1591 | int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1592 | struct ext4_iloc iloc; | |
1593 | struct ext4_dir_entry_2 *de; | |
1594 | ||
1595 | ret = ext4_get_inode_loc(inode, &iloc); | |
1596 | if (ret) | |
1597 | return ret; | |
1598 | ||
1599 | ret = ext4_prepare_inline_data(handle, inode, inline_size); | |
1600 | if (ret) | |
1601 | goto out; | |
1602 | ||
1603 | /* | |
1604 | * For inline dir, we only save the inode information for the ".." | |
1605 | * and create a fake dentry to cover the left space. | |
1606 | */ | |
1607 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1608 | de->inode = cpu_to_le32(parent->i_ino); | |
1609 | de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); | |
1610 | de->inode = 0; | |
1611 | de->rec_len = ext4_rec_len_to_disk( | |
1612 | inline_size - EXT4_INLINE_DOTDOT_SIZE, | |
1613 | inline_size); | |
1614 | set_nlink(inode, 2); | |
1615 | inode->i_size = EXT4_I(inode)->i_disksize = inline_size; | |
1616 | out: | |
1617 | brelse(iloc.bh); | |
1618 | return ret; | |
1619 | } | |
1620 | ||
e8e948e7 TM |
1621 | struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
1622 | const struct qstr *d_name, | |
1623 | struct ext4_dir_entry_2 **res_dir, | |
1624 | int *has_inline_data) | |
1625 | { | |
1626 | int ret; | |
1627 | struct ext4_iloc iloc; | |
1628 | void *inline_start; | |
1629 | int inline_size; | |
1630 | ||
1631 | if (ext4_get_inode_loc(dir, &iloc)) | |
1632 | return NULL; | |
1633 | ||
1634 | down_read(&EXT4_I(dir)->xattr_sem); | |
1635 | if (!ext4_has_inline_data(dir)) { | |
1636 | *has_inline_data = 0; | |
1637 | goto out; | |
1638 | } | |
1639 | ||
1640 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1641 | EXT4_INLINE_DOTDOT_SIZE; | |
1642 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
1643 | ret = search_dir(iloc.bh, inline_start, inline_size, | |
1644 | dir, d_name, 0, res_dir); | |
1645 | if (ret == 1) | |
1646 | goto out_find; | |
1647 | if (ret < 0) | |
1648 | goto out; | |
1649 | ||
1650 | if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE) | |
1651 | goto out; | |
1652 | ||
1653 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1654 | inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE; | |
1655 | ||
1656 | ret = search_dir(iloc.bh, inline_start, inline_size, | |
1657 | dir, d_name, 0, res_dir); | |
1658 | if (ret == 1) | |
1659 | goto out_find; | |
1660 | ||
1661 | out: | |
1662 | brelse(iloc.bh); | |
1663 | iloc.bh = NULL; | |
1664 | out_find: | |
1665 | up_read(&EXT4_I(dir)->xattr_sem); | |
1666 | return iloc.bh; | |
1667 | } | |
1668 | ||
9f40fe54 TM |
1669 | int ext4_delete_inline_entry(handle_t *handle, |
1670 | struct inode *dir, | |
1671 | struct ext4_dir_entry_2 *de_del, | |
1672 | struct buffer_head *bh, | |
1673 | int *has_inline_data) | |
1674 | { | |
1675 | int err, inline_size; | |
1676 | struct ext4_iloc iloc; | |
1677 | void *inline_start; | |
1678 | ||
1679 | err = ext4_get_inode_loc(dir, &iloc); | |
1680 | if (err) | |
1681 | return err; | |
1682 | ||
1683 | down_write(&EXT4_I(dir)->xattr_sem); | |
1684 | if (!ext4_has_inline_data(dir)) { | |
1685 | *has_inline_data = 0; | |
1686 | goto out; | |
1687 | } | |
1688 | ||
1689 | if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) < | |
1690 | EXT4_MIN_INLINE_DATA_SIZE) { | |
1691 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1692 | EXT4_INLINE_DOTDOT_SIZE; | |
1693 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - | |
1694 | EXT4_INLINE_DOTDOT_SIZE; | |
1695 | } else { | |
1696 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1697 | inline_size = ext4_get_inline_size(dir) - | |
1698 | EXT4_MIN_INLINE_DATA_SIZE; | |
1699 | } | |
1700 | ||
1701 | err = ext4_journal_get_write_access(handle, bh); | |
1702 | if (err) | |
1703 | goto out; | |
1704 | ||
1705 | err = ext4_generic_delete_entry(handle, dir, de_del, bh, | |
1706 | inline_start, inline_size, 0); | |
1707 | if (err) | |
1708 | goto out; | |
1709 | ||
1710 | BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata"); | |
1711 | err = ext4_mark_inode_dirty(handle, dir); | |
1712 | if (unlikely(err)) | |
1713 | goto out; | |
1714 | ||
1715 | ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); | |
1716 | out: | |
1717 | up_write(&EXT4_I(dir)->xattr_sem); | |
1718 | brelse(iloc.bh); | |
1719 | if (err != -ENOENT) | |
1720 | ext4_std_error(dir->i_sb, err); | |
1721 | return err; | |
1722 | } | |
1723 | ||
61f86638 TM |
1724 | /* |
1725 | * Get the inline dentry at offset. | |
1726 | */ | |
1727 | static inline struct ext4_dir_entry_2 * | |
1728 | ext4_get_inline_entry(struct inode *inode, | |
1729 | struct ext4_iloc *iloc, | |
1730 | unsigned int offset, | |
1731 | void **inline_start, | |
1732 | int *inline_size) | |
1733 | { | |
1734 | void *inline_pos; | |
1735 | ||
1736 | BUG_ON(offset > ext4_get_inline_size(inode)); | |
1737 | ||
1738 | if (offset < EXT4_MIN_INLINE_DATA_SIZE) { | |
1739 | inline_pos = (void *)ext4_raw_inode(iloc)->i_block; | |
1740 | *inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1741 | } else { | |
1742 | inline_pos = ext4_get_inline_xattr_pos(inode, iloc); | |
1743 | offset -= EXT4_MIN_INLINE_DATA_SIZE; | |
1744 | *inline_size = ext4_get_inline_size(inode) - | |
1745 | EXT4_MIN_INLINE_DATA_SIZE; | |
1746 | } | |
1747 | ||
1748 | if (inline_start) | |
1749 | *inline_start = inline_pos; | |
1750 | return (struct ext4_dir_entry_2 *)(inline_pos + offset); | |
1751 | } | |
1752 | ||
1753 | int empty_inline_dir(struct inode *dir, int *has_inline_data) | |
1754 | { | |
1755 | int err, inline_size; | |
1756 | struct ext4_iloc iloc; | |
1757 | void *inline_pos; | |
1758 | unsigned int offset; | |
1759 | struct ext4_dir_entry_2 *de; | |
1760 | int ret = 1; | |
1761 | ||
1762 | err = ext4_get_inode_loc(dir, &iloc); | |
1763 | if (err) { | |
1764 | EXT4_ERROR_INODE(dir, "error %d getting inode %lu block", | |
1765 | err, dir->i_ino); | |
1766 | return 1; | |
1767 | } | |
1768 | ||
1769 | down_read(&EXT4_I(dir)->xattr_sem); | |
1770 | if (!ext4_has_inline_data(dir)) { | |
1771 | *has_inline_data = 0; | |
1772 | goto out; | |
1773 | } | |
1774 | ||
1775 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1776 | if (!le32_to_cpu(de->inode)) { | |
1777 | ext4_warning(dir->i_sb, | |
1778 | "bad inline directory (dir #%lu) - no `..'", | |
1779 | dir->i_ino); | |
1780 | ret = 1; | |
1781 | goto out; | |
1782 | } | |
1783 | ||
1784 | offset = EXT4_INLINE_DOTDOT_SIZE; | |
1785 | while (offset < dir->i_size) { | |
1786 | de = ext4_get_inline_entry(dir, &iloc, offset, | |
1787 | &inline_pos, &inline_size); | |
1788 | if (ext4_check_dir_entry(dir, NULL, de, | |
1789 | iloc.bh, inline_pos, | |
1790 | inline_size, offset)) { | |
1791 | ext4_warning(dir->i_sb, | |
1792 | "bad inline directory (dir #%lu) - " | |
1793 | "inode %u, rec_len %u, name_len %d" | |
1794 | "inline size %d\n", | |
1795 | dir->i_ino, le32_to_cpu(de->inode), | |
1796 | le16_to_cpu(de->rec_len), de->name_len, | |
1797 | inline_size); | |
1798 | ret = 1; | |
1799 | goto out; | |
1800 | } | |
1801 | if (le32_to_cpu(de->inode)) { | |
1802 | ret = 0; | |
1803 | goto out; | |
1804 | } | |
1805 | offset += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1806 | } | |
1807 | ||
1808 | out: | |
1809 | up_read(&EXT4_I(dir)->xattr_sem); | |
1810 | brelse(iloc.bh); | |
1811 | return ret; | |
1812 | } | |
1813 | ||
67cf5b09 TM |
1814 | int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
1815 | { | |
1816 | int ret; | |
1817 | ||
1818 | down_write(&EXT4_I(inode)->xattr_sem); | |
1819 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
1820 | up_write(&EXT4_I(inode)->xattr_sem); | |
1821 | ||
1822 | return ret; | |
1823 | } | |
94191985 TM |
1824 | |
1825 | int ext4_inline_data_fiemap(struct inode *inode, | |
1826 | struct fiemap_extent_info *fieinfo, | |
1827 | int *has_inline) | |
1828 | { | |
1829 | __u64 physical = 0; | |
1830 | __u64 length; | |
1831 | __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST; | |
1832 | int error = 0; | |
1833 | struct ext4_iloc iloc; | |
1834 | ||
1835 | down_read(&EXT4_I(inode)->xattr_sem); | |
1836 | if (!ext4_has_inline_data(inode)) { | |
1837 | *has_inline = 0; | |
1838 | goto out; | |
1839 | } | |
1840 | ||
1841 | error = ext4_get_inode_loc(inode, &iloc); | |
1842 | if (error) | |
1843 | goto out; | |
1844 | ||
1845 | physical = iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; | |
1846 | physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; | |
1847 | physical += offsetof(struct ext4_inode, i_block); | |
1848 | length = i_size_read(inode); | |
1849 | ||
1850 | if (physical) | |
1851 | error = fiemap_fill_next_extent(fieinfo, 0, physical, | |
1852 | length, flags); | |
1853 | brelse(iloc.bh); | |
1854 | out: | |
1855 | up_read(&EXT4_I(inode)->xattr_sem); | |
1856 | return (error < 0 ? error : 0); | |
1857 | } | |
0d812f77 TM |
1858 | |
1859 | /* | |
1860 | * Called during xattr set, and if we can sparse space 'needed', | |
1861 | * just create the extent tree evict the data to the outer block. | |
1862 | * | |
1863 | * We use jbd2 instead of page cache to move data to the 1st block | |
1864 | * so that the whole transaction can be committed as a whole and | |
1865 | * the data isn't lost because of the delayed page cache write. | |
1866 | */ | |
1867 | int ext4_try_to_evict_inline_data(handle_t *handle, | |
1868 | struct inode *inode, | |
1869 | int needed) | |
1870 | { | |
1871 | int error; | |
1872 | struct ext4_xattr_entry *entry; | |
1873 | struct ext4_xattr_ibody_header *header; | |
1874 | struct ext4_inode *raw_inode; | |
1875 | struct ext4_iloc iloc; | |
1876 | ||
1877 | error = ext4_get_inode_loc(inode, &iloc); | |
1878 | if (error) | |
1879 | return error; | |
1880 | ||
1881 | raw_inode = ext4_raw_inode(&iloc); | |
1882 | header = IHDR(inode, raw_inode); | |
1883 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
1884 | EXT4_I(inode)->i_inline_off); | |
1885 | if (EXT4_XATTR_LEN(entry->e_name_len) + | |
1886 | EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) { | |
1887 | error = -ENOSPC; | |
1888 | goto out; | |
1889 | } | |
1890 | ||
1891 | error = ext4_convert_inline_data_nolock(handle, inode, &iloc); | |
1892 | out: | |
1893 | brelse(iloc.bh); | |
1894 | return error; | |
1895 | } | |
aef1c851 TM |
1896 | |
1897 | void ext4_inline_data_truncate(struct inode *inode, int *has_inline) | |
1898 | { | |
1899 | handle_t *handle; | |
1900 | int inline_size, value_len, needed_blocks; | |
1901 | size_t i_size; | |
1902 | void *value = NULL; | |
1903 | struct ext4_xattr_ibody_find is = { | |
1904 | .s = { .not_found = -ENODATA, }, | |
1905 | }; | |
1906 | struct ext4_xattr_info i = { | |
1907 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
1908 | .name = EXT4_XATTR_SYSTEM_DATA, | |
1909 | }; | |
1910 | ||
1911 | ||
1912 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
9924a92a | 1913 | handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
aef1c851 TM |
1914 | if (IS_ERR(handle)) |
1915 | return; | |
1916 | ||
1917 | down_write(&EXT4_I(inode)->xattr_sem); | |
1918 | if (!ext4_has_inline_data(inode)) { | |
1919 | *has_inline = 0; | |
1920 | ext4_journal_stop(handle); | |
1921 | return; | |
1922 | } | |
1923 | ||
1924 | if (ext4_orphan_add(handle, inode)) | |
1925 | goto out; | |
1926 | ||
1927 | if (ext4_get_inode_loc(inode, &is.iloc)) | |
1928 | goto out; | |
1929 | ||
1930 | down_write(&EXT4_I(inode)->i_data_sem); | |
1931 | i_size = inode->i_size; | |
1932 | inline_size = ext4_get_inline_size(inode); | |
1933 | EXT4_I(inode)->i_disksize = i_size; | |
1934 | ||
1935 | if (i_size < inline_size) { | |
1936 | /* Clear the content in the xattr space. */ | |
1937 | if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { | |
1938 | if (ext4_xattr_ibody_find(inode, &i, &is)) | |
1939 | goto out_error; | |
1940 | ||
1941 | BUG_ON(is.s.not_found); | |
1942 | ||
1943 | value_len = le32_to_cpu(is.s.here->e_value_size); | |
1944 | value = kmalloc(value_len, GFP_NOFS); | |
1945 | if (!value) | |
1946 | goto out_error; | |
1947 | ||
1948 | if (ext4_xattr_ibody_get(inode, i.name_index, i.name, | |
1949 | value, value_len)) | |
1950 | goto out_error; | |
1951 | ||
1952 | i.value = value; | |
1953 | i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? | |
1954 | i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; | |
1955 | if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is)) | |
1956 | goto out_error; | |
1957 | } | |
1958 | ||
1959 | /* Clear the content within i_blocks. */ | |
1960 | if (i_size < EXT4_MIN_INLINE_DATA_SIZE) | |
1961 | memset(ext4_raw_inode(&is.iloc)->i_block + i_size, 0, | |
1962 | EXT4_MIN_INLINE_DATA_SIZE - i_size); | |
1963 | ||
1964 | EXT4_I(inode)->i_inline_size = i_size < | |
1965 | EXT4_MIN_INLINE_DATA_SIZE ? | |
1966 | EXT4_MIN_INLINE_DATA_SIZE : i_size; | |
1967 | } | |
1968 | ||
1969 | out_error: | |
1970 | up_write(&EXT4_I(inode)->i_data_sem); | |
1971 | out: | |
1972 | brelse(is.iloc.bh); | |
1973 | up_write(&EXT4_I(inode)->xattr_sem); | |
1974 | kfree(value); | |
1975 | if (inode->i_nlink) | |
1976 | ext4_orphan_del(handle, inode); | |
1977 | ||
1978 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); | |
1979 | ext4_mark_inode_dirty(handle, inode); | |
1980 | if (IS_SYNC(inode)) | |
1981 | ext4_handle_sync(handle); | |
1982 | ||
1983 | ext4_journal_stop(handle); | |
1984 | return; | |
1985 | } | |
0c8d414f TM |
1986 | |
1987 | int ext4_convert_inline_data(struct inode *inode) | |
1988 | { | |
1989 | int error, needed_blocks; | |
1990 | handle_t *handle; | |
1991 | struct ext4_iloc iloc; | |
1992 | ||
1993 | if (!ext4_has_inline_data(inode)) { | |
1994 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1995 | return 0; | |
1996 | } | |
1997 | ||
1998 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
1999 | ||
2000 | iloc.bh = NULL; | |
2001 | error = ext4_get_inode_loc(inode, &iloc); | |
2002 | if (error) | |
2003 | return error; | |
2004 | ||
9924a92a | 2005 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
0c8d414f TM |
2006 | if (IS_ERR(handle)) { |
2007 | error = PTR_ERR(handle); | |
2008 | goto out_free; | |
2009 | } | |
2010 | ||
2011 | down_write(&EXT4_I(inode)->xattr_sem); | |
2012 | if (!ext4_has_inline_data(inode)) { | |
2013 | up_write(&EXT4_I(inode)->xattr_sem); | |
2014 | goto out; | |
2015 | } | |
2016 | ||
2017 | error = ext4_convert_inline_data_nolock(handle, inode, &iloc); | |
2018 | up_write(&EXT4_I(inode)->xattr_sem); | |
2019 | out: | |
2020 | ext4_journal_stop(handle); | |
2021 | out_free: | |
2022 | brelse(iloc.bh); | |
2023 | return error; | |
2024 | } |