Commit | Line | Data |
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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" |
67cf5b09 TM |
18 | |
19 | #define EXT4_XATTR_SYSTEM_DATA "data" | |
20 | #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) | |
3c47d541 | 21 | #define EXT4_INLINE_DOTDOT_SIZE 4 |
67cf5b09 TM |
22 | |
23 | int ext4_get_inline_size(struct inode *inode) | |
24 | { | |
25 | if (EXT4_I(inode)->i_inline_off) | |
26 | return EXT4_I(inode)->i_inline_size; | |
27 | ||
28 | return 0; | |
29 | } | |
30 | ||
31 | static int get_max_inline_xattr_value_size(struct inode *inode, | |
32 | struct ext4_iloc *iloc) | |
33 | { | |
34 | struct ext4_xattr_ibody_header *header; | |
35 | struct ext4_xattr_entry *entry; | |
36 | struct ext4_inode *raw_inode; | |
37 | int free, min_offs; | |
38 | ||
39 | min_offs = EXT4_SB(inode->i_sb)->s_inode_size - | |
40 | EXT4_GOOD_OLD_INODE_SIZE - | |
41 | EXT4_I(inode)->i_extra_isize - | |
42 | sizeof(struct ext4_xattr_ibody_header); | |
43 | ||
44 | /* | |
45 | * We need to subtract another sizeof(__u32) since an in-inode xattr | |
46 | * needs an empty 4 bytes to indicate the gap between the xattr entry | |
47 | * and the name/value pair. | |
48 | */ | |
49 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) | |
50 | return EXT4_XATTR_SIZE(min_offs - | |
51 | EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - | |
52 | EXT4_XATTR_ROUND - sizeof(__u32)); | |
53 | ||
54 | raw_inode = ext4_raw_inode(iloc); | |
55 | header = IHDR(inode, raw_inode); | |
56 | entry = IFIRST(header); | |
57 | ||
58 | /* Compute min_offs. */ | |
59 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { | |
60 | if (!entry->e_value_block && entry->e_value_size) { | |
61 | size_t offs = le16_to_cpu(entry->e_value_offs); | |
62 | if (offs < min_offs) | |
63 | min_offs = offs; | |
64 | } | |
65 | } | |
66 | free = min_offs - | |
67 | ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); | |
68 | ||
69 | if (EXT4_I(inode)->i_inline_off) { | |
70 | entry = (struct ext4_xattr_entry *) | |
71 | ((void *)raw_inode + EXT4_I(inode)->i_inline_off); | |
72 | ||
73 | free += le32_to_cpu(entry->e_value_size); | |
74 | goto out; | |
75 | } | |
76 | ||
77 | free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); | |
78 | ||
79 | if (free > EXT4_XATTR_ROUND) | |
80 | free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); | |
81 | else | |
82 | free = 0; | |
83 | ||
84 | out: | |
85 | return free; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Get the maximum size we now can store in an inode. | |
90 | * If we can't find the space for a xattr entry, don't use the space | |
91 | * of the extents since we have no space to indicate the inline data. | |
92 | */ | |
93 | int ext4_get_max_inline_size(struct inode *inode) | |
94 | { | |
95 | int error, max_inline_size; | |
96 | struct ext4_iloc iloc; | |
97 | ||
98 | if (EXT4_I(inode)->i_extra_isize == 0) | |
99 | return 0; | |
100 | ||
101 | error = ext4_get_inode_loc(inode, &iloc); | |
102 | if (error) { | |
103 | ext4_error_inode(inode, __func__, __LINE__, 0, | |
104 | "can't get inode location %lu", | |
105 | inode->i_ino); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | down_read(&EXT4_I(inode)->xattr_sem); | |
110 | max_inline_size = get_max_inline_xattr_value_size(inode, &iloc); | |
111 | up_read(&EXT4_I(inode)->xattr_sem); | |
112 | ||
113 | brelse(iloc.bh); | |
114 | ||
115 | if (!max_inline_size) | |
116 | return 0; | |
117 | ||
118 | return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; | |
119 | } | |
120 | ||
121 | int ext4_has_inline_data(struct inode *inode) | |
122 | { | |
123 | return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) && | |
124 | EXT4_I(inode)->i_inline_off; | |
125 | } | |
126 | ||
127 | /* | |
128 | * this function does not take xattr_sem, which is OK because it is | |
129 | * currently only used in a code path coming form ext4_iget, before | |
130 | * the new inode has been unlocked | |
131 | */ | |
132 | int ext4_find_inline_data_nolock(struct inode *inode) | |
133 | { | |
134 | struct ext4_xattr_ibody_find is = { | |
135 | .s = { .not_found = -ENODATA, }, | |
136 | }; | |
137 | struct ext4_xattr_info i = { | |
138 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
139 | .name = EXT4_XATTR_SYSTEM_DATA, | |
140 | }; | |
141 | int error; | |
142 | ||
143 | if (EXT4_I(inode)->i_extra_isize == 0) | |
144 | return 0; | |
145 | ||
146 | error = ext4_get_inode_loc(inode, &is.iloc); | |
147 | if (error) | |
148 | return error; | |
149 | ||
150 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
151 | if (error) | |
152 | goto out; | |
153 | ||
154 | if (!is.s.not_found) { | |
155 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
156 | (void *)ext4_raw_inode(&is.iloc)); | |
157 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
158 | le32_to_cpu(is.s.here->e_value_size); | |
159 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
160 | } | |
161 | out: | |
162 | brelse(is.iloc.bh); | |
163 | return error; | |
164 | } | |
165 | ||
166 | static int ext4_read_inline_data(struct inode *inode, void *buffer, | |
167 | unsigned int len, | |
168 | struct ext4_iloc *iloc) | |
169 | { | |
170 | struct ext4_xattr_entry *entry; | |
171 | struct ext4_xattr_ibody_header *header; | |
172 | int cp_len = 0; | |
173 | struct ext4_inode *raw_inode; | |
174 | ||
175 | if (!len) | |
176 | return 0; | |
177 | ||
178 | BUG_ON(len > EXT4_I(inode)->i_inline_size); | |
179 | ||
180 | cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? | |
181 | len : EXT4_MIN_INLINE_DATA_SIZE; | |
182 | ||
183 | raw_inode = ext4_raw_inode(iloc); | |
184 | memcpy(buffer, (void *)(raw_inode->i_block), cp_len); | |
185 | ||
186 | len -= cp_len; | |
187 | buffer += cp_len; | |
188 | ||
189 | if (!len) | |
190 | goto out; | |
191 | ||
192 | header = IHDR(inode, raw_inode); | |
193 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
194 | EXT4_I(inode)->i_inline_off); | |
195 | len = min_t(unsigned int, len, | |
196 | (unsigned int)le32_to_cpu(entry->e_value_size)); | |
197 | ||
198 | memcpy(buffer, | |
199 | (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); | |
200 | cp_len += len; | |
201 | ||
202 | out: | |
203 | return cp_len; | |
204 | } | |
205 | ||
206 | /* | |
207 | * write the buffer to the inline inode. | |
208 | * If 'create' is set, we don't need to do the extra copy in the xattr | |
209 | * value since it is already handled by ext4_xattr_ibody_set. That saves | |
210 | * us one memcpy. | |
211 | */ | |
212 | void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, | |
213 | void *buffer, loff_t pos, unsigned int len) | |
214 | { | |
215 | struct ext4_xattr_entry *entry; | |
216 | struct ext4_xattr_ibody_header *header; | |
217 | struct ext4_inode *raw_inode; | |
218 | int cp_len = 0; | |
219 | ||
220 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
221 | BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); | |
222 | ||
223 | raw_inode = ext4_raw_inode(iloc); | |
224 | buffer += pos; | |
225 | ||
226 | if (pos < EXT4_MIN_INLINE_DATA_SIZE) { | |
227 | cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? | |
228 | EXT4_MIN_INLINE_DATA_SIZE - pos : len; | |
229 | memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); | |
230 | ||
231 | len -= cp_len; | |
232 | buffer += cp_len; | |
233 | pos += cp_len; | |
234 | } | |
235 | ||
236 | if (!len) | |
237 | return; | |
238 | ||
239 | pos -= EXT4_MIN_INLINE_DATA_SIZE; | |
240 | header = IHDR(inode, raw_inode); | |
241 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
242 | EXT4_I(inode)->i_inline_off); | |
243 | ||
244 | memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, | |
245 | buffer, len); | |
246 | } | |
247 | ||
248 | static int ext4_create_inline_data(handle_t *handle, | |
249 | struct inode *inode, unsigned len) | |
250 | { | |
251 | int error; | |
252 | void *value = NULL; | |
253 | struct ext4_xattr_ibody_find is = { | |
254 | .s = { .not_found = -ENODATA, }, | |
255 | }; | |
256 | struct ext4_xattr_info i = { | |
257 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
258 | .name = EXT4_XATTR_SYSTEM_DATA, | |
259 | }; | |
260 | ||
261 | error = ext4_get_inode_loc(inode, &is.iloc); | |
262 | if (error) | |
263 | return error; | |
264 | ||
265 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
266 | if (error) | |
267 | goto out; | |
268 | ||
269 | if (len > EXT4_MIN_INLINE_DATA_SIZE) { | |
270 | value = (void *)empty_zero_page; | |
271 | len -= EXT4_MIN_INLINE_DATA_SIZE; | |
272 | } else { | |
273 | value = ""; | |
274 | len = 0; | |
275 | } | |
276 | ||
277 | /* Insert the the xttr entry. */ | |
278 | i.value = value; | |
279 | i.value_len = len; | |
280 | ||
281 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
282 | if (error) | |
283 | goto out; | |
284 | ||
285 | BUG_ON(!is.s.not_found); | |
286 | ||
287 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); | |
288 | if (error) { | |
289 | if (error == -ENOSPC) | |
290 | ext4_clear_inode_state(inode, | |
291 | EXT4_STATE_MAY_INLINE_DATA); | |
292 | goto out; | |
293 | } | |
294 | ||
295 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
296 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
297 | ||
298 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
299 | (void *)ext4_raw_inode(&is.iloc)); | |
300 | EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; | |
301 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
302 | ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
303 | get_bh(is.iloc.bh); | |
304 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
305 | ||
306 | out: | |
307 | brelse(is.iloc.bh); | |
308 | return error; | |
309 | } | |
310 | ||
311 | static int ext4_update_inline_data(handle_t *handle, struct inode *inode, | |
312 | unsigned int len) | |
313 | { | |
314 | int error; | |
315 | void *value = NULL; | |
316 | struct ext4_xattr_ibody_find is = { | |
317 | .s = { .not_found = -ENODATA, }, | |
318 | }; | |
319 | struct ext4_xattr_info i = { | |
320 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
321 | .name = EXT4_XATTR_SYSTEM_DATA, | |
322 | }; | |
323 | ||
324 | /* If the old space is ok, write the data directly. */ | |
325 | if (len <= EXT4_I(inode)->i_inline_size) | |
326 | return 0; | |
327 | ||
328 | error = ext4_get_inode_loc(inode, &is.iloc); | |
329 | if (error) | |
330 | return error; | |
331 | ||
332 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
333 | if (error) | |
334 | goto out; | |
335 | ||
336 | BUG_ON(is.s.not_found); | |
337 | ||
338 | len -= EXT4_MIN_INLINE_DATA_SIZE; | |
339 | value = kzalloc(len, GFP_NOFS); | |
340 | if (!value) | |
341 | goto out; | |
342 | ||
343 | error = ext4_xattr_ibody_get(inode, i.name_index, i.name, | |
344 | value, len); | |
345 | if (error == -ENODATA) | |
346 | goto out; | |
347 | ||
348 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
349 | if (error) | |
350 | goto out; | |
351 | ||
352 | /* Update the xttr entry. */ | |
353 | i.value = value; | |
354 | i.value_len = len; | |
355 | ||
356 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); | |
357 | if (error) | |
358 | goto out; | |
359 | ||
360 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
361 | (void *)ext4_raw_inode(&is.iloc)); | |
362 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
363 | le32_to_cpu(is.s.here->e_value_size); | |
364 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
365 | get_bh(is.iloc.bh); | |
366 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
367 | ||
368 | out: | |
369 | kfree(value); | |
370 | brelse(is.iloc.bh); | |
371 | return error; | |
372 | } | |
373 | ||
374 | int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, | |
375 | unsigned int len) | |
376 | { | |
377 | int ret, size; | |
378 | struct ext4_inode_info *ei = EXT4_I(inode); | |
379 | ||
380 | if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) | |
381 | return -ENOSPC; | |
382 | ||
383 | size = ext4_get_max_inline_size(inode); | |
384 | if (size < len) | |
385 | return -ENOSPC; | |
386 | ||
387 | down_write(&EXT4_I(inode)->xattr_sem); | |
388 | ||
389 | if (ei->i_inline_off) | |
390 | ret = ext4_update_inline_data(handle, inode, len); | |
391 | else | |
392 | ret = ext4_create_inline_data(handle, inode, len); | |
393 | ||
394 | up_write(&EXT4_I(inode)->xattr_sem); | |
395 | ||
396 | return ret; | |
397 | } | |
398 | ||
399 | static int ext4_destroy_inline_data_nolock(handle_t *handle, | |
400 | struct inode *inode) | |
401 | { | |
402 | struct ext4_inode_info *ei = EXT4_I(inode); | |
403 | struct ext4_xattr_ibody_find is = { | |
404 | .s = { .not_found = 0, }, | |
405 | }; | |
406 | struct ext4_xattr_info i = { | |
407 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
408 | .name = EXT4_XATTR_SYSTEM_DATA, | |
409 | .value = NULL, | |
410 | .value_len = 0, | |
411 | }; | |
412 | int error; | |
413 | ||
414 | if (!ei->i_inline_off) | |
415 | return 0; | |
416 | ||
417 | error = ext4_get_inode_loc(inode, &is.iloc); | |
418 | if (error) | |
419 | return error; | |
420 | ||
421 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
422 | if (error) | |
423 | goto out; | |
424 | ||
425 | error = ext4_journal_get_write_access(handle, is.iloc.bh); | |
426 | if (error) | |
427 | goto out; | |
428 | ||
429 | error = ext4_xattr_ibody_set(handle, inode, &i, &is); | |
430 | if (error) | |
431 | goto out; | |
432 | ||
433 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
434 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
435 | ||
436 | if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb, | |
437 | EXT4_FEATURE_INCOMPAT_EXTENTS)) { | |
438 | if (S_ISDIR(inode->i_mode) || | |
439 | S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { | |
440 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); | |
441 | ext4_ext_tree_init(handle, inode); | |
442 | } | |
443 | } | |
444 | ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
445 | ||
446 | get_bh(is.iloc.bh); | |
447 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
448 | ||
449 | EXT4_I(inode)->i_inline_off = 0; | |
450 | EXT4_I(inode)->i_inline_size = 0; | |
451 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
452 | out: | |
453 | brelse(is.iloc.bh); | |
454 | if (error == -ENODATA) | |
455 | error = 0; | |
456 | return error; | |
457 | } | |
458 | ||
46c7f254 TM |
459 | static int ext4_read_inline_page(struct inode *inode, struct page *page) |
460 | { | |
461 | void *kaddr; | |
462 | int ret = 0; | |
463 | size_t len; | |
464 | struct ext4_iloc iloc; | |
465 | ||
466 | BUG_ON(!PageLocked(page)); | |
467 | BUG_ON(!ext4_has_inline_data(inode)); | |
468 | BUG_ON(page->index); | |
469 | ||
470 | if (!EXT4_I(inode)->i_inline_off) { | |
471 | ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", | |
472 | inode->i_ino); | |
473 | goto out; | |
474 | } | |
475 | ||
476 | ret = ext4_get_inode_loc(inode, &iloc); | |
477 | if (ret) | |
478 | goto out; | |
479 | ||
480 | len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); | |
481 | kaddr = kmap_atomic(page); | |
482 | ret = ext4_read_inline_data(inode, kaddr, len, &iloc); | |
483 | flush_dcache_page(page); | |
484 | kunmap_atomic(kaddr); | |
485 | zero_user_segment(page, len, PAGE_CACHE_SIZE); | |
486 | SetPageUptodate(page); | |
487 | brelse(iloc.bh); | |
488 | ||
489 | out: | |
490 | return ret; | |
491 | } | |
492 | ||
493 | int ext4_readpage_inline(struct inode *inode, struct page *page) | |
494 | { | |
495 | int ret = 0; | |
496 | ||
497 | down_read(&EXT4_I(inode)->xattr_sem); | |
498 | if (!ext4_has_inline_data(inode)) { | |
499 | up_read(&EXT4_I(inode)->xattr_sem); | |
500 | return -EAGAIN; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Current inline data can only exist in the 1st page, | |
505 | * So for all the other pages, just set them uptodate. | |
506 | */ | |
507 | if (!page->index) | |
508 | ret = ext4_read_inline_page(inode, page); | |
509 | else if (!PageUptodate(page)) { | |
510 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); | |
511 | SetPageUptodate(page); | |
512 | } | |
513 | ||
514 | up_read(&EXT4_I(inode)->xattr_sem); | |
515 | ||
516 | unlock_page(page); | |
517 | return ret >= 0 ? 0 : ret; | |
518 | } | |
519 | ||
f19d5870 TM |
520 | static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
521 | struct inode *inode, | |
522 | unsigned flags) | |
523 | { | |
524 | int ret, needed_blocks; | |
525 | handle_t *handle = NULL; | |
526 | int retries = 0, sem_held = 0; | |
527 | struct page *page = NULL; | |
528 | unsigned from, to; | |
529 | struct ext4_iloc iloc; | |
530 | ||
531 | if (!ext4_has_inline_data(inode)) { | |
532 | /* | |
533 | * clear the flag so that no new write | |
534 | * will trap here again. | |
535 | */ | |
536 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
537 | return 0; | |
538 | } | |
539 | ||
540 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
541 | ||
542 | ret = ext4_get_inode_loc(inode, &iloc); | |
543 | if (ret) | |
544 | return ret; | |
545 | ||
546 | retry: | |
547 | handle = ext4_journal_start(inode, needed_blocks); | |
548 | if (IS_ERR(handle)) { | |
549 | ret = PTR_ERR(handle); | |
550 | handle = NULL; | |
551 | goto out; | |
552 | } | |
553 | ||
554 | /* We cannot recurse into the filesystem as the transaction is already | |
555 | * started */ | |
556 | flags |= AOP_FLAG_NOFS; | |
557 | ||
558 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
559 | if (!page) { | |
560 | ret = -ENOMEM; | |
561 | goto out; | |
562 | } | |
563 | ||
564 | down_write(&EXT4_I(inode)->xattr_sem); | |
565 | sem_held = 1; | |
566 | /* If some one has already done this for us, just exit. */ | |
567 | if (!ext4_has_inline_data(inode)) { | |
568 | ret = 0; | |
569 | goto out; | |
570 | } | |
571 | ||
572 | from = 0; | |
573 | to = ext4_get_inline_size(inode); | |
574 | if (!PageUptodate(page)) { | |
575 | ret = ext4_read_inline_page(inode, page); | |
576 | if (ret < 0) | |
577 | goto out; | |
578 | } | |
579 | ||
580 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
581 | if (ret) | |
582 | goto out; | |
583 | ||
584 | if (ext4_should_dioread_nolock(inode)) | |
585 | ret = __block_write_begin(page, from, to, ext4_get_block_write); | |
586 | else | |
587 | ret = __block_write_begin(page, from, to, ext4_get_block); | |
588 | ||
589 | if (!ret && ext4_should_journal_data(inode)) { | |
590 | ret = ext4_walk_page_buffers(handle, page_buffers(page), | |
591 | from, to, NULL, | |
592 | do_journal_get_write_access); | |
593 | } | |
594 | ||
595 | if (ret) { | |
596 | unlock_page(page); | |
597 | page_cache_release(page); | |
598 | ext4_orphan_add(handle, inode); | |
599 | up_write(&EXT4_I(inode)->xattr_sem); | |
600 | sem_held = 0; | |
601 | ext4_journal_stop(handle); | |
602 | handle = NULL; | |
603 | ext4_truncate_failed_write(inode); | |
604 | /* | |
605 | * If truncate failed early the inode might | |
606 | * still be on the orphan list; we need to | |
607 | * make sure the inode is removed from the | |
608 | * orphan list in that case. | |
609 | */ | |
610 | if (inode->i_nlink) | |
611 | ext4_orphan_del(NULL, inode); | |
612 | } | |
613 | ||
614 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
615 | goto retry; | |
616 | ||
617 | block_commit_write(page, from, to); | |
618 | out: | |
619 | if (page) { | |
620 | unlock_page(page); | |
621 | page_cache_release(page); | |
622 | } | |
623 | if (sem_held) | |
624 | up_write(&EXT4_I(inode)->xattr_sem); | |
625 | if (handle) | |
626 | ext4_journal_stop(handle); | |
627 | brelse(iloc.bh); | |
628 | return ret; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Try to write data in the inode. | |
633 | * If the inode has inline data, check whether the new write can be | |
634 | * in the inode also. If not, create the page the handle, move the data | |
635 | * to the page make it update and let the later codes create extent for it. | |
636 | */ | |
637 | int ext4_try_to_write_inline_data(struct address_space *mapping, | |
638 | struct inode *inode, | |
639 | loff_t pos, unsigned len, | |
640 | unsigned flags, | |
641 | struct page **pagep) | |
642 | { | |
643 | int ret; | |
644 | handle_t *handle; | |
645 | struct page *page; | |
646 | struct ext4_iloc iloc; | |
647 | ||
648 | if (pos + len > ext4_get_max_inline_size(inode)) | |
649 | goto convert; | |
650 | ||
651 | ret = ext4_get_inode_loc(inode, &iloc); | |
652 | if (ret) | |
653 | return ret; | |
654 | ||
655 | /* | |
656 | * The possible write could happen in the inode, | |
657 | * so try to reserve the space in inode first. | |
658 | */ | |
659 | handle = ext4_journal_start(inode, 1); | |
660 | if (IS_ERR(handle)) { | |
661 | ret = PTR_ERR(handle); | |
662 | handle = NULL; | |
663 | goto out; | |
664 | } | |
665 | ||
666 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
667 | if (ret && ret != -ENOSPC) | |
668 | goto out; | |
669 | ||
670 | /* We don't have space in inline inode, so convert it to extent. */ | |
671 | if (ret == -ENOSPC) { | |
672 | ext4_journal_stop(handle); | |
673 | brelse(iloc.bh); | |
674 | goto convert; | |
675 | } | |
676 | ||
677 | flags |= AOP_FLAG_NOFS; | |
678 | ||
679 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
680 | if (!page) { | |
681 | ret = -ENOMEM; | |
682 | goto out; | |
683 | } | |
684 | ||
685 | *pagep = page; | |
686 | down_read(&EXT4_I(inode)->xattr_sem); | |
687 | if (!ext4_has_inline_data(inode)) { | |
688 | ret = 0; | |
689 | unlock_page(page); | |
690 | page_cache_release(page); | |
691 | goto out_up_read; | |
692 | } | |
693 | ||
694 | if (!PageUptodate(page)) { | |
695 | ret = ext4_read_inline_page(inode, page); | |
696 | if (ret < 0) | |
697 | goto out_up_read; | |
698 | } | |
699 | ||
700 | ret = 1; | |
701 | handle = NULL; | |
702 | out_up_read: | |
703 | up_read(&EXT4_I(inode)->xattr_sem); | |
704 | out: | |
705 | if (handle) | |
706 | ext4_journal_stop(handle); | |
707 | brelse(iloc.bh); | |
708 | return ret; | |
709 | convert: | |
710 | return ext4_convert_inline_data_to_extent(mapping, | |
711 | inode, flags); | |
712 | } | |
713 | ||
714 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, | |
715 | unsigned copied, struct page *page) | |
716 | { | |
717 | int ret; | |
718 | void *kaddr; | |
719 | struct ext4_iloc iloc; | |
720 | ||
721 | if (unlikely(copied < len)) { | |
722 | if (!PageUptodate(page)) { | |
723 | copied = 0; | |
724 | goto out; | |
725 | } | |
726 | } | |
727 | ||
728 | ret = ext4_get_inode_loc(inode, &iloc); | |
729 | if (ret) { | |
730 | ext4_std_error(inode->i_sb, ret); | |
731 | copied = 0; | |
732 | goto out; | |
733 | } | |
734 | ||
735 | down_write(&EXT4_I(inode)->xattr_sem); | |
736 | BUG_ON(!ext4_has_inline_data(inode)); | |
737 | ||
738 | kaddr = kmap_atomic(page); | |
739 | ext4_write_inline_data(inode, &iloc, kaddr, pos, len); | |
740 | kunmap_atomic(kaddr); | |
741 | SetPageUptodate(page); | |
742 | /* clear page dirty so that writepages wouldn't work for us. */ | |
743 | ClearPageDirty(page); | |
744 | ||
745 | up_write(&EXT4_I(inode)->xattr_sem); | |
746 | brelse(iloc.bh); | |
747 | out: | |
748 | return copied; | |
749 | } | |
750 | ||
3fdcfb66 TM |
751 | struct buffer_head * |
752 | ext4_journalled_write_inline_data(struct inode *inode, | |
753 | unsigned len, | |
754 | struct page *page) | |
755 | { | |
756 | int ret; | |
757 | void *kaddr; | |
758 | struct ext4_iloc iloc; | |
759 | ||
760 | ret = ext4_get_inode_loc(inode, &iloc); | |
761 | if (ret) { | |
762 | ext4_std_error(inode->i_sb, ret); | |
763 | return NULL; | |
764 | } | |
765 | ||
766 | down_write(&EXT4_I(inode)->xattr_sem); | |
767 | kaddr = kmap_atomic(page); | |
768 | ext4_write_inline_data(inode, &iloc, kaddr, 0, len); | |
769 | kunmap_atomic(kaddr); | |
770 | up_write(&EXT4_I(inode)->xattr_sem); | |
771 | ||
772 | return iloc.bh; | |
773 | } | |
774 | ||
9c3569b5 TM |
775 | /* |
776 | * Try to make the page cache and handle ready for the inline data case. | |
777 | * We can call this function in 2 cases: | |
778 | * 1. The inode is created and the first write exceeds inline size. We can | |
779 | * clear the inode state safely. | |
780 | * 2. The inode has inline data, then we need to read the data, make it | |
781 | * update and dirty so that ext4_da_writepages can handle it. We don't | |
782 | * need to start the journal since the file's metatdata isn't changed now. | |
783 | */ | |
784 | static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, | |
785 | struct inode *inode, | |
786 | unsigned flags, | |
787 | void **fsdata) | |
788 | { | |
789 | int ret = 0, inline_size; | |
790 | struct page *page; | |
791 | ||
792 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
793 | if (!page) | |
794 | return -ENOMEM; | |
795 | ||
796 | down_read(&EXT4_I(inode)->xattr_sem); | |
797 | if (!ext4_has_inline_data(inode)) { | |
798 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
799 | goto out; | |
800 | } | |
801 | ||
802 | inline_size = ext4_get_inline_size(inode); | |
803 | ||
804 | if (!PageUptodate(page)) { | |
805 | ret = ext4_read_inline_page(inode, page); | |
806 | if (ret < 0) | |
807 | goto out; | |
808 | } | |
809 | ||
810 | ret = __block_write_begin(page, 0, inline_size, | |
811 | ext4_da_get_block_prep); | |
812 | if (ret) { | |
813 | ext4_truncate_failed_write(inode); | |
814 | goto out; | |
815 | } | |
816 | ||
817 | SetPageDirty(page); | |
818 | SetPageUptodate(page); | |
819 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
820 | *fsdata = (void *)CONVERT_INLINE_DATA; | |
821 | ||
822 | out: | |
823 | up_read(&EXT4_I(inode)->xattr_sem); | |
824 | if (page) { | |
825 | unlock_page(page); | |
826 | page_cache_release(page); | |
827 | } | |
828 | return ret; | |
829 | } | |
830 | ||
831 | /* | |
832 | * Prepare the write for the inline data. | |
833 | * If the the data can be written into the inode, we just read | |
834 | * the page and make it uptodate, and start the journal. | |
835 | * Otherwise read the page, makes it dirty so that it can be | |
836 | * handle in writepages(the i_disksize update is left to the | |
837 | * normal ext4_da_write_end). | |
838 | */ | |
839 | int ext4_da_write_inline_data_begin(struct address_space *mapping, | |
840 | struct inode *inode, | |
841 | loff_t pos, unsigned len, | |
842 | unsigned flags, | |
843 | struct page **pagep, | |
844 | void **fsdata) | |
845 | { | |
846 | int ret, inline_size; | |
847 | handle_t *handle; | |
848 | struct page *page; | |
849 | struct ext4_iloc iloc; | |
850 | ||
851 | ret = ext4_get_inode_loc(inode, &iloc); | |
852 | if (ret) | |
853 | return ret; | |
854 | ||
855 | handle = ext4_journal_start(inode, 1); | |
856 | if (IS_ERR(handle)) { | |
857 | ret = PTR_ERR(handle); | |
858 | handle = NULL; | |
859 | goto out; | |
860 | } | |
861 | ||
862 | inline_size = ext4_get_max_inline_size(inode); | |
863 | ||
864 | ret = -ENOSPC; | |
865 | if (inline_size >= pos + len) { | |
866 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
867 | if (ret && ret != -ENOSPC) | |
868 | goto out; | |
869 | } | |
870 | ||
871 | if (ret == -ENOSPC) { | |
872 | ret = ext4_da_convert_inline_data_to_extent(mapping, | |
873 | inode, | |
874 | flags, | |
875 | fsdata); | |
876 | goto out; | |
877 | } | |
878 | ||
879 | /* | |
880 | * We cannot recurse into the filesystem as the transaction | |
881 | * is already started. | |
882 | */ | |
883 | flags |= AOP_FLAG_NOFS; | |
884 | ||
885 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
886 | if (!page) { | |
887 | ret = -ENOMEM; | |
888 | goto out; | |
889 | } | |
890 | ||
891 | down_read(&EXT4_I(inode)->xattr_sem); | |
892 | if (!ext4_has_inline_data(inode)) { | |
893 | ret = 0; | |
894 | goto out_release_page; | |
895 | } | |
896 | ||
897 | if (!PageUptodate(page)) { | |
898 | ret = ext4_read_inline_page(inode, page); | |
899 | if (ret < 0) | |
900 | goto out_release_page; | |
901 | } | |
902 | ||
903 | up_read(&EXT4_I(inode)->xattr_sem); | |
904 | *pagep = page; | |
905 | handle = NULL; | |
906 | brelse(iloc.bh); | |
907 | return 1; | |
908 | out_release_page: | |
909 | up_read(&EXT4_I(inode)->xattr_sem); | |
910 | unlock_page(page); | |
911 | page_cache_release(page); | |
912 | out: | |
913 | if (handle) | |
914 | ext4_journal_stop(handle); | |
915 | brelse(iloc.bh); | |
916 | return ret; | |
917 | } | |
918 | ||
919 | int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, | |
920 | unsigned len, unsigned copied, | |
921 | struct page *page) | |
922 | { | |
923 | int i_size_changed = 0; | |
924 | ||
925 | copied = ext4_write_inline_data_end(inode, pos, len, copied, page); | |
926 | ||
927 | /* | |
928 | * No need to use i_size_read() here, the i_size | |
929 | * cannot change under us because we hold i_mutex. | |
930 | * | |
931 | * But it's important to update i_size while still holding page lock: | |
932 | * page writeout could otherwise come in and zero beyond i_size. | |
933 | */ | |
934 | if (pos+copied > inode->i_size) { | |
935 | i_size_write(inode, pos+copied); | |
936 | i_size_changed = 1; | |
937 | } | |
938 | unlock_page(page); | |
939 | page_cache_release(page); | |
940 | ||
941 | /* | |
942 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
943 | * makes the holding time of page lock longer. Second, it forces lock | |
944 | * ordering of page lock and transaction start for journaling | |
945 | * filesystems. | |
946 | */ | |
947 | if (i_size_changed) | |
948 | mark_inode_dirty(inode); | |
949 | ||
950 | return copied; | |
951 | } | |
f19d5870 | 952 | |
3c47d541 TM |
953 | #ifdef INLINE_DIR_DEBUG |
954 | void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, | |
955 | void *inline_start, int inline_size) | |
956 | { | |
957 | int offset; | |
958 | unsigned short de_len; | |
959 | struct ext4_dir_entry_2 *de = inline_start; | |
960 | void *dlimit = inline_start + inline_size; | |
961 | ||
962 | trace_printk("inode %lu\n", dir->i_ino); | |
963 | offset = 0; | |
964 | while ((void *)de < dlimit) { | |
965 | de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); | |
966 | trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n", | |
967 | offset, de_len, de->name_len, de->name, | |
968 | de->name_len, le32_to_cpu(de->inode)); | |
969 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
970 | inline_start, inline_size, offset)) | |
971 | BUG(); | |
972 | ||
973 | offset += de_len; | |
974 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); | |
975 | } | |
976 | } | |
977 | #else | |
978 | #define ext4_show_inline_dir(dir, bh, inline_start, inline_size) | |
979 | #endif | |
980 | ||
981 | /* | |
982 | * Add a new entry into a inline dir. | |
983 | * It will return -ENOSPC if no space is available, and -EIO | |
984 | * and -EEXIST if directory entry already exists. | |
985 | */ | |
986 | static int ext4_add_dirent_to_inline(handle_t *handle, | |
987 | struct dentry *dentry, | |
988 | struct inode *inode, | |
989 | struct ext4_iloc *iloc, | |
990 | void *inline_start, int inline_size) | |
991 | { | |
992 | struct inode *dir = dentry->d_parent->d_inode; | |
993 | const char *name = dentry->d_name.name; | |
994 | int namelen = dentry->d_name.len; | |
995 | unsigned short reclen; | |
996 | int err; | |
997 | struct ext4_dir_entry_2 *de; | |
998 | ||
999 | reclen = EXT4_DIR_REC_LEN(namelen); | |
1000 | err = ext4_find_dest_de(dir, inode, iloc->bh, | |
1001 | inline_start, inline_size, | |
1002 | name, namelen, &de); | |
1003 | if (err) | |
1004 | return err; | |
1005 | ||
1006 | err = ext4_journal_get_write_access(handle, iloc->bh); | |
1007 | if (err) | |
1008 | return err; | |
1009 | ext4_insert_dentry(inode, de, inline_size, name, namelen); | |
1010 | ||
1011 | ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); | |
1012 | ||
1013 | /* | |
1014 | * XXX shouldn't update any times until successful | |
1015 | * completion of syscall, but too many callers depend | |
1016 | * on this. | |
1017 | * | |
1018 | * XXX similarly, too many callers depend on | |
1019 | * ext4_new_inode() setting the times, but error | |
1020 | * recovery deletes the inode, so the worst that can | |
1021 | * happen is that the times are slightly out of date | |
1022 | * and/or different from the directory change time. | |
1023 | */ | |
1024 | dir->i_mtime = dir->i_ctime = ext4_current_time(dir); | |
1025 | ext4_update_dx_flag(dir); | |
1026 | dir->i_version++; | |
1027 | ext4_mark_inode_dirty(handle, dir); | |
1028 | return 1; | |
1029 | } | |
1030 | ||
1031 | static void *ext4_get_inline_xattr_pos(struct inode *inode, | |
1032 | struct ext4_iloc *iloc) | |
1033 | { | |
1034 | struct ext4_xattr_entry *entry; | |
1035 | struct ext4_xattr_ibody_header *header; | |
1036 | ||
1037 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
1038 | ||
1039 | header = IHDR(inode, ext4_raw_inode(iloc)); | |
1040 | entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + | |
1041 | EXT4_I(inode)->i_inline_off); | |
1042 | ||
1043 | return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); | |
1044 | } | |
1045 | ||
1046 | /* Set the final de to cover the whole block. */ | |
1047 | static void ext4_update_final_de(void *de_buf, int old_size, int new_size) | |
1048 | { | |
1049 | struct ext4_dir_entry_2 *de, *prev_de; | |
1050 | void *limit; | |
1051 | int de_len; | |
1052 | ||
1053 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1054 | if (old_size) { | |
1055 | limit = de_buf + old_size; | |
1056 | do { | |
1057 | prev_de = de; | |
1058 | de_len = ext4_rec_len_from_disk(de->rec_len, old_size); | |
1059 | de_buf += de_len; | |
1060 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1061 | } while (de_buf < limit); | |
1062 | ||
1063 | prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - | |
1064 | old_size, new_size); | |
1065 | } else { | |
1066 | /* this is just created, so create an empty entry. */ | |
1067 | de->inode = 0; | |
1068 | de->rec_len = ext4_rec_len_to_disk(new_size, new_size); | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, | |
1073 | struct ext4_iloc *iloc) | |
1074 | { | |
1075 | int ret; | |
1076 | int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; | |
1077 | int new_size = get_max_inline_xattr_value_size(dir, iloc); | |
1078 | ||
1079 | if (new_size - old_size <= EXT4_DIR_REC_LEN(1)) | |
1080 | return -ENOSPC; | |
1081 | ||
1082 | ret = ext4_update_inline_data(handle, dir, | |
1083 | new_size + EXT4_MIN_INLINE_DATA_SIZE); | |
1084 | if (ret) | |
1085 | return ret; | |
1086 | ||
1087 | ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, | |
1088 | EXT4_I(dir)->i_inline_size - | |
1089 | EXT4_MIN_INLINE_DATA_SIZE); | |
1090 | dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; | |
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, | |
1095 | struct ext4_iloc *iloc, | |
1096 | void *buf, int inline_size) | |
1097 | { | |
1098 | ext4_create_inline_data(handle, inode, inline_size); | |
1099 | ext4_write_inline_data(inode, iloc, buf, 0, inline_size); | |
1100 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1101 | } | |
1102 | ||
1103 | static int ext4_finish_convert_inline_dir(handle_t *handle, | |
1104 | struct inode *inode, | |
1105 | struct buffer_head *dir_block, | |
1106 | void *buf, | |
1107 | int inline_size) | |
1108 | { | |
1109 | int err, csum_size = 0, header_size = 0; | |
1110 | struct ext4_dir_entry_2 *de; | |
1111 | struct ext4_dir_entry_tail *t; | |
1112 | void *target = dir_block->b_data; | |
1113 | ||
1114 | /* | |
1115 | * First create "." and ".." and then copy the dir information | |
1116 | * back to the block. | |
1117 | */ | |
1118 | de = (struct ext4_dir_entry_2 *)target; | |
1119 | de = ext4_init_dot_dotdot(inode, de, | |
1120 | inode->i_sb->s_blocksize, csum_size, | |
1121 | le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); | |
1122 | header_size = (void *)de - target; | |
1123 | ||
1124 | memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, | |
1125 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1126 | ||
1127 | if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
1128 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
1129 | csum_size = sizeof(struct ext4_dir_entry_tail); | |
1130 | ||
1131 | inode->i_size = inode->i_sb->s_blocksize; | |
1132 | i_size_write(inode, inode->i_sb->s_blocksize); | |
1133 | EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; | |
1134 | ext4_update_final_de(dir_block->b_data, | |
1135 | inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, | |
1136 | inode->i_sb->s_blocksize - csum_size); | |
1137 | ||
1138 | if (csum_size) { | |
1139 | t = EXT4_DIRENT_TAIL(dir_block->b_data, | |
1140 | inode->i_sb->s_blocksize); | |
1141 | initialize_dirent_tail(t, inode->i_sb->s_blocksize); | |
1142 | } | |
1143 | set_buffer_uptodate(dir_block); | |
1144 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
1145 | if (err) | |
1146 | goto out; | |
1147 | set_buffer_verified(dir_block); | |
1148 | out: | |
1149 | return err; | |
1150 | } | |
1151 | ||
1152 | static int ext4_convert_inline_data_nolock(handle_t *handle, | |
1153 | struct inode *inode, | |
1154 | struct ext4_iloc *iloc) | |
1155 | { | |
1156 | int error; | |
1157 | void *buf = NULL; | |
1158 | struct buffer_head *data_bh = NULL; | |
1159 | struct ext4_map_blocks map; | |
1160 | int inline_size; | |
1161 | ||
1162 | inline_size = ext4_get_inline_size(inode); | |
1163 | buf = kmalloc(inline_size, GFP_NOFS); | |
1164 | if (!buf) { | |
1165 | error = -ENOMEM; | |
1166 | goto out; | |
1167 | } | |
1168 | ||
1169 | error = ext4_read_inline_data(inode, buf, inline_size, iloc); | |
1170 | if (error < 0) | |
1171 | goto out; | |
1172 | ||
1173 | error = ext4_destroy_inline_data_nolock(handle, inode); | |
1174 | if (error) | |
1175 | goto out; | |
1176 | ||
1177 | map.m_lblk = 0; | |
1178 | map.m_len = 1; | |
1179 | map.m_flags = 0; | |
1180 | error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE); | |
1181 | if (error < 0) | |
1182 | goto out_restore; | |
1183 | if (!(map.m_flags & EXT4_MAP_MAPPED)) { | |
1184 | error = -EIO; | |
1185 | goto out_restore; | |
1186 | } | |
1187 | ||
1188 | data_bh = sb_getblk(inode->i_sb, map.m_pblk); | |
1189 | if (!data_bh) { | |
1190 | error = -EIO; | |
1191 | goto out_restore; | |
1192 | } | |
1193 | ||
1194 | lock_buffer(data_bh); | |
1195 | error = ext4_journal_get_create_access(handle, data_bh); | |
1196 | if (error) { | |
1197 | unlock_buffer(data_bh); | |
1198 | error = -EIO; | |
1199 | goto out_restore; | |
1200 | } | |
1201 | memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); | |
1202 | ||
1203 | if (!S_ISDIR(inode->i_mode)) { | |
1204 | memcpy(data_bh->b_data, buf, inline_size); | |
1205 | set_buffer_uptodate(data_bh); | |
1206 | error = ext4_handle_dirty_metadata(handle, | |
1207 | inode, data_bh); | |
1208 | } else { | |
1209 | error = ext4_finish_convert_inline_dir(handle, inode, data_bh, | |
1210 | buf, inline_size); | |
1211 | } | |
1212 | ||
1213 | unlock_buffer(data_bh); | |
1214 | out_restore: | |
1215 | if (error) | |
1216 | ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); | |
1217 | ||
1218 | out: | |
1219 | brelse(data_bh); | |
1220 | kfree(buf); | |
1221 | return error; | |
1222 | } | |
1223 | ||
1224 | /* | |
1225 | * Try to add the new entry to the inline data. | |
1226 | * If succeeds, return 0. If not, extended the inline dir and copied data to | |
1227 | * the new created block. | |
1228 | */ | |
1229 | int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry, | |
1230 | struct inode *inode) | |
1231 | { | |
1232 | int ret, inline_size; | |
1233 | void *inline_start; | |
1234 | struct ext4_iloc iloc; | |
1235 | struct inode *dir = dentry->d_parent->d_inode; | |
1236 | ||
1237 | ret = ext4_get_inode_loc(dir, &iloc); | |
1238 | if (ret) | |
1239 | return ret; | |
1240 | ||
1241 | down_write(&EXT4_I(dir)->xattr_sem); | |
1242 | if (!ext4_has_inline_data(dir)) | |
1243 | goto out; | |
1244 | ||
1245 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1246 | EXT4_INLINE_DOTDOT_SIZE; | |
1247 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
1248 | ||
1249 | ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc, | |
1250 | inline_start, inline_size); | |
1251 | if (ret != -ENOSPC) | |
1252 | goto out; | |
1253 | ||
1254 | /* check whether it can be inserted to inline xattr space. */ | |
1255 | inline_size = EXT4_I(dir)->i_inline_size - | |
1256 | EXT4_MIN_INLINE_DATA_SIZE; | |
1257 | if (!inline_size) { | |
1258 | /* Try to use the xattr space.*/ | |
1259 | ret = ext4_update_inline_dir(handle, dir, &iloc); | |
1260 | if (ret && ret != -ENOSPC) | |
1261 | goto out; | |
1262 | ||
1263 | inline_size = EXT4_I(dir)->i_inline_size - | |
1264 | EXT4_MIN_INLINE_DATA_SIZE; | |
1265 | } | |
1266 | ||
1267 | if (inline_size) { | |
1268 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1269 | ||
1270 | ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc, | |
1271 | inline_start, inline_size); | |
1272 | ||
1273 | if (ret != -ENOSPC) | |
1274 | goto out; | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * The inline space is filled up, so create a new block for it. | |
1279 | * As the extent tree will be created, we have to save the inline | |
1280 | * dir first. | |
1281 | */ | |
1282 | ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); | |
1283 | ||
1284 | out: | |
1285 | ext4_mark_inode_dirty(handle, dir); | |
1286 | up_write(&EXT4_I(dir)->xattr_sem); | |
1287 | brelse(iloc.bh); | |
1288 | return ret; | |
1289 | } | |
1290 | ||
65d165d9 TM |
1291 | int ext4_read_inline_dir(struct file *filp, |
1292 | void *dirent, filldir_t filldir, | |
1293 | int *has_inline_data) | |
1294 | { | |
1295 | int error = 0; | |
1296 | unsigned int offset, parent_ino; | |
1297 | int i, stored; | |
1298 | struct ext4_dir_entry_2 *de; | |
1299 | struct super_block *sb; | |
1300 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1301 | int ret, inline_size = 0; | |
1302 | struct ext4_iloc iloc; | |
1303 | void *dir_buf = NULL; | |
1304 | ||
1305 | ret = ext4_get_inode_loc(inode, &iloc); | |
1306 | if (ret) | |
1307 | return ret; | |
1308 | ||
1309 | down_read(&EXT4_I(inode)->xattr_sem); | |
1310 | if (!ext4_has_inline_data(inode)) { | |
1311 | up_read(&EXT4_I(inode)->xattr_sem); | |
1312 | *has_inline_data = 0; | |
1313 | goto out; | |
1314 | } | |
1315 | ||
1316 | inline_size = ext4_get_inline_size(inode); | |
1317 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1318 | if (!dir_buf) { | |
1319 | ret = -ENOMEM; | |
1320 | up_read(&EXT4_I(inode)->xattr_sem); | |
1321 | goto out; | |
1322 | } | |
1323 | ||
1324 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1325 | up_read(&EXT4_I(inode)->xattr_sem); | |
1326 | if (ret < 0) | |
1327 | goto out; | |
1328 | ||
1329 | sb = inode->i_sb; | |
1330 | stored = 0; | |
1331 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); | |
1332 | ||
1333 | while (!error && !stored && filp->f_pos < inode->i_size) { | |
1334 | revalidate: | |
1335 | /* | |
1336 | * If the version has changed since the last call to | |
1337 | * readdir(2), then we might be pointing to an invalid | |
1338 | * dirent right now. Scan from the start of the inline | |
1339 | * dir to make sure. | |
1340 | */ | |
1341 | if (filp->f_version != inode->i_version) { | |
1342 | for (i = 0; | |
1343 | i < inode->i_size && i < offset;) { | |
1344 | if (!i) { | |
1345 | /* skip "." and ".." if needed. */ | |
1346 | i += EXT4_INLINE_DOTDOT_SIZE; | |
1347 | continue; | |
1348 | } | |
1349 | de = (struct ext4_dir_entry_2 *) | |
1350 | (dir_buf + i); | |
1351 | /* It's too expensive to do a full | |
1352 | * dirent test each time round this | |
1353 | * loop, but we do have to test at | |
1354 | * least that it is non-zero. A | |
1355 | * failure will be detected in the | |
1356 | * dirent test below. */ | |
1357 | if (ext4_rec_len_from_disk(de->rec_len, | |
1358 | inline_size) < EXT4_DIR_REC_LEN(1)) | |
1359 | break; | |
1360 | i += ext4_rec_len_from_disk(de->rec_len, | |
1361 | inline_size); | |
1362 | } | |
1363 | offset = i; | |
1364 | filp->f_pos = offset; | |
1365 | filp->f_version = inode->i_version; | |
1366 | } | |
1367 | ||
1368 | while (!error && filp->f_pos < inode->i_size) { | |
1369 | if (filp->f_pos == 0) { | |
1370 | error = filldir(dirent, ".", 1, 0, inode->i_ino, | |
1371 | DT_DIR); | |
1372 | if (error) | |
1373 | break; | |
1374 | stored++; | |
1375 | ||
1376 | error = filldir(dirent, "..", 2, 0, parent_ino, | |
1377 | DT_DIR); | |
1378 | if (error) | |
1379 | break; | |
1380 | stored++; | |
1381 | ||
1382 | filp->f_pos = offset = EXT4_INLINE_DOTDOT_SIZE; | |
1383 | continue; | |
1384 | } | |
1385 | ||
1386 | de = (struct ext4_dir_entry_2 *)(dir_buf + offset); | |
1387 | if (ext4_check_dir_entry(inode, filp, de, | |
1388 | iloc.bh, dir_buf, | |
1389 | inline_size, offset)) { | |
1390 | ret = stored; | |
1391 | goto out; | |
1392 | } | |
1393 | offset += ext4_rec_len_from_disk(de->rec_len, | |
1394 | inline_size); | |
1395 | if (le32_to_cpu(de->inode)) { | |
1396 | /* We might block in the next section | |
1397 | * if the data destination is | |
1398 | * currently swapped out. So, use a | |
1399 | * version stamp to detect whether or | |
1400 | * not the directory has been modified | |
1401 | * during the copy operation. | |
1402 | */ | |
1403 | u64 version = filp->f_version; | |
1404 | ||
1405 | error = filldir(dirent, de->name, | |
1406 | de->name_len, | |
1407 | filp->f_pos, | |
1408 | le32_to_cpu(de->inode), | |
1409 | get_dtype(sb, de->file_type)); | |
1410 | if (error) | |
1411 | break; | |
1412 | if (version != filp->f_version) | |
1413 | goto revalidate; | |
1414 | stored++; | |
1415 | } | |
1416 | filp->f_pos += ext4_rec_len_from_disk(de->rec_len, | |
1417 | inline_size); | |
1418 | } | |
1419 | offset = 0; | |
1420 | } | |
1421 | out: | |
1422 | kfree(dir_buf); | |
1423 | brelse(iloc.bh); | |
1424 | return ret; | |
1425 | } | |
1426 | ||
3c47d541 TM |
1427 | /* |
1428 | * Try to create the inline data for the new dir. | |
1429 | * If it succeeds, return 0, otherwise return the error. | |
1430 | * In case of ENOSPC, the caller should create the normal disk layout dir. | |
1431 | */ | |
1432 | int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, | |
1433 | struct inode *inode) | |
1434 | { | |
1435 | int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1436 | struct ext4_iloc iloc; | |
1437 | struct ext4_dir_entry_2 *de; | |
1438 | ||
1439 | ret = ext4_get_inode_loc(inode, &iloc); | |
1440 | if (ret) | |
1441 | return ret; | |
1442 | ||
1443 | ret = ext4_prepare_inline_data(handle, inode, inline_size); | |
1444 | if (ret) | |
1445 | goto out; | |
1446 | ||
1447 | /* | |
1448 | * For inline dir, we only save the inode information for the ".." | |
1449 | * and create a fake dentry to cover the left space. | |
1450 | */ | |
1451 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1452 | de->inode = cpu_to_le32(parent->i_ino); | |
1453 | de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); | |
1454 | de->inode = 0; | |
1455 | de->rec_len = ext4_rec_len_to_disk( | |
1456 | inline_size - EXT4_INLINE_DOTDOT_SIZE, | |
1457 | inline_size); | |
1458 | set_nlink(inode, 2); | |
1459 | inode->i_size = EXT4_I(inode)->i_disksize = inline_size; | |
1460 | out: | |
1461 | brelse(iloc.bh); | |
1462 | return ret; | |
1463 | } | |
1464 | ||
67cf5b09 TM |
1465 | int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
1466 | { | |
1467 | int ret; | |
1468 | ||
1469 | down_write(&EXT4_I(inode)->xattr_sem); | |
1470 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
1471 | up_write(&EXT4_I(inode)->xattr_sem); | |
1472 | ||
1473 | return ret; | |
1474 | } |