blob: 095c7a258d97d0bf05b26de9bf42c99fc01b143d [file] [log] [blame]
Tao Ma67cf5b02012-12-10 14:04:46 -05001/*
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 */
Michael Halcrow4bdfc872015-04-12 00:56:28 -040014
15#include <linux/fiemap.h>
16
Tao Ma67cf5b02012-12-10 14:04:46 -050017#include "ext4_jbd2.h"
18#include "ext4.h"
19#include "xattr.h"
Tao Maf19d5872012-12-10 14:05:51 -050020#include "truncate.h"
Tao Ma67cf5b02012-12-10 14:04:46 -050021
22#define EXT4_XATTR_SYSTEM_DATA "data"
23#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
Tao Ma8af0f082013-04-19 17:53:09 -040024#define EXT4_INLINE_DOTDOT_OFFSET 2
25#define EXT4_INLINE_DOTDOT_SIZE 4
Tao Ma67cf5b02012-12-10 14:04:46 -050026
Stephen Hemmingerc1978552014-05-12 10:50:23 -040027static int ext4_get_inline_size(struct inode *inode)
Tao Ma67cf5b02012-12-10 14:04:46 -050028{
29 if (EXT4_I(inode)->i_inline_off)
30 return EXT4_I(inode)->i_inline_size;
31
32 return 0;
33}
34
35static int get_max_inline_xattr_value_size(struct inode *inode,
36 struct ext4_iloc *iloc)
37{
38 struct ext4_xattr_ibody_header *header;
39 struct ext4_xattr_entry *entry;
40 struct ext4_inode *raw_inode;
41 int free, min_offs;
42
43 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 EXT4_GOOD_OLD_INODE_SIZE -
45 EXT4_I(inode)->i_extra_isize -
46 sizeof(struct ext4_xattr_ibody_header);
47
48 /*
49 * We need to subtract another sizeof(__u32) since an in-inode xattr
50 * needs an empty 4 bytes to indicate the gap between the xattr entry
51 * and the name/value pair.
52 */
53 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 return EXT4_XATTR_SIZE(min_offs -
55 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 EXT4_XATTR_ROUND - sizeof(__u32));
57
58 raw_inode = ext4_raw_inode(iloc);
59 header = IHDR(inode, raw_inode);
60 entry = IFIRST(header);
61
62 /* Compute min_offs. */
63 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
64 if (!entry->e_value_block && entry->e_value_size) {
65 size_t offs = le16_to_cpu(entry->e_value_offs);
66 if (offs < min_offs)
67 min_offs = offs;
68 }
69 }
70 free = min_offs -
71 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
72
73 if (EXT4_I(inode)->i_inline_off) {
74 entry = (struct ext4_xattr_entry *)
75 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
76
boxi liuc4932db2013-07-01 08:12:37 -040077 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
Tao Ma67cf5b02012-12-10 14:04:46 -050078 goto out;
79 }
80
81 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
82
83 if (free > EXT4_XATTR_ROUND)
84 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
85 else
86 free = 0;
87
88out:
89 return free;
90}
91
92/*
93 * Get the maximum size we now can store in an inode.
94 * If we can't find the space for a xattr entry, don't use the space
95 * of the extents since we have no space to indicate the inline data.
96 */
97int ext4_get_max_inline_size(struct inode *inode)
98{
99 int error, max_inline_size;
100 struct ext4_iloc iloc;
101
102 if (EXT4_I(inode)->i_extra_isize == 0)
103 return 0;
104
105 error = ext4_get_inode_loc(inode, &iloc);
106 if (error) {
107 ext4_error_inode(inode, __func__, __LINE__, 0,
108 "can't get inode location %lu",
109 inode->i_ino);
110 return 0;
111 }
112
113 down_read(&EXT4_I(inode)->xattr_sem);
114 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
115 up_read(&EXT4_I(inode)->xattr_sem);
116
117 brelse(iloc.bh);
118
119 if (!max_inline_size)
120 return 0;
121
122 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
123}
124
Tao Ma67cf5b02012-12-10 14:04:46 -0500125/*
126 * this function does not take xattr_sem, which is OK because it is
127 * currently only used in a code path coming form ext4_iget, before
128 * the new inode has been unlocked
129 */
130int ext4_find_inline_data_nolock(struct inode *inode)
131{
132 struct ext4_xattr_ibody_find is = {
133 .s = { .not_found = -ENODATA, },
134 };
135 struct ext4_xattr_info i = {
136 .name_index = EXT4_XATTR_INDEX_SYSTEM,
137 .name = EXT4_XATTR_SYSTEM_DATA,
138 };
139 int error;
140
141 if (EXT4_I(inode)->i_extra_isize == 0)
142 return 0;
143
144 error = ext4_get_inode_loc(inode, &is.iloc);
145 if (error)
146 return error;
147
148 error = ext4_xattr_ibody_find(inode, &i, &is);
149 if (error)
150 goto out;
151
152 if (!is.s.not_found) {
153 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
154 (void *)ext4_raw_inode(&is.iloc));
155 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
156 le32_to_cpu(is.s.here->e_value_size);
157 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
158 }
159out:
160 brelse(is.iloc.bh);
161 return error;
162}
163
164static int ext4_read_inline_data(struct inode *inode, void *buffer,
165 unsigned int len,
166 struct ext4_iloc *iloc)
167{
168 struct ext4_xattr_entry *entry;
169 struct ext4_xattr_ibody_header *header;
170 int cp_len = 0;
171 struct ext4_inode *raw_inode;
172
173 if (!len)
174 return 0;
175
176 BUG_ON(len > EXT4_I(inode)->i_inline_size);
177
178 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
179 len : EXT4_MIN_INLINE_DATA_SIZE;
180
181 raw_inode = ext4_raw_inode(iloc);
182 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
183
184 len -= cp_len;
185 buffer += cp_len;
186
187 if (!len)
188 goto out;
189
190 header = IHDR(inode, raw_inode);
191 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
192 EXT4_I(inode)->i_inline_off);
193 len = min_t(unsigned int, len,
194 (unsigned int)le32_to_cpu(entry->e_value_size));
195
196 memcpy(buffer,
197 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
198 cp_len += len;
199
200out:
201 return cp_len;
202}
203
204/*
205 * write the buffer to the inline inode.
206 * If 'create' is set, we don't need to do the extra copy in the xattr
Tao Ma0d812f72012-12-10 14:06:02 -0500207 * value since it is already handled by ext4_xattr_ibody_inline_set.
208 * That saves us one memcpy.
Tao Ma67cf5b02012-12-10 14:04:46 -0500209 */
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400210static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
211 void *buffer, loff_t pos, unsigned int len)
Tao Ma67cf5b02012-12-10 14:04:46 -0500212{
213 struct ext4_xattr_entry *entry;
214 struct ext4_xattr_ibody_header *header;
215 struct ext4_inode *raw_inode;
216 int cp_len = 0;
217
218 BUG_ON(!EXT4_I(inode)->i_inline_off);
219 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
220
221 raw_inode = ext4_raw_inode(iloc);
222 buffer += pos;
223
224 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
225 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
226 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
227 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
228
229 len -= cp_len;
230 buffer += cp_len;
231 pos += cp_len;
232 }
233
234 if (!len)
235 return;
236
237 pos -= EXT4_MIN_INLINE_DATA_SIZE;
238 header = IHDR(inode, raw_inode);
239 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
240 EXT4_I(inode)->i_inline_off);
241
242 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
243 buffer, len);
244}
245
246static int ext4_create_inline_data(handle_t *handle,
247 struct inode *inode, unsigned len)
248{
249 int error;
250 void *value = NULL;
251 struct ext4_xattr_ibody_find is = {
252 .s = { .not_found = -ENODATA, },
253 };
254 struct ext4_xattr_info i = {
255 .name_index = EXT4_XATTR_INDEX_SYSTEM,
256 .name = EXT4_XATTR_SYSTEM_DATA,
257 };
258
259 error = ext4_get_inode_loc(inode, &is.iloc);
260 if (error)
261 return error;
262
liang xie5d601252014-05-12 22:06:43 -0400263 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500264 error = ext4_journal_get_write_access(handle, is.iloc.bh);
265 if (error)
266 goto out;
267
268 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
Theodore Ts'obd9926e2012-12-11 03:31:49 -0500269 value = EXT4_ZERO_XATTR_VALUE;
Tao Ma67cf5b02012-12-10 14:04:46 -0500270 len -= EXT4_MIN_INLINE_DATA_SIZE;
271 } else {
272 value = "";
273 len = 0;
274 }
275
276 /* Insert the the xttr entry. */
277 i.value = value;
278 i.value_len = len;
279
280 error = ext4_xattr_ibody_find(inode, &i, &is);
281 if (error)
282 goto out;
283
284 BUG_ON(!is.s.not_found);
285
Tao Ma0d812f72012-12-10 14:06:02 -0500286 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500287 if (error) {
288 if (error == -ENOSPC)
289 ext4_clear_inode_state(inode,
290 EXT4_STATE_MAY_INLINE_DATA);
291 goto out;
292 }
293
294 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
295 0, EXT4_MIN_INLINE_DATA_SIZE);
296
297 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
298 (void *)ext4_raw_inode(&is.iloc));
299 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
300 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
301 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
302 get_bh(is.iloc.bh);
303 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
304
305out:
306 brelse(is.iloc.bh);
307 return error;
308}
309
310static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
311 unsigned int len)
312{
313 int error;
314 void *value = NULL;
315 struct ext4_xattr_ibody_find is = {
316 .s = { .not_found = -ENODATA, },
317 };
318 struct ext4_xattr_info i = {
319 .name_index = EXT4_XATTR_INDEX_SYSTEM,
320 .name = EXT4_XATTR_SYSTEM_DATA,
321 };
322
323 /* If the old space is ok, write the data directly. */
324 if (len <= EXT4_I(inode)->i_inline_size)
325 return 0;
326
327 error = ext4_get_inode_loc(inode, &is.iloc);
328 if (error)
329 return error;
330
331 error = ext4_xattr_ibody_find(inode, &i, &is);
332 if (error)
333 goto out;
334
335 BUG_ON(is.s.not_found);
336
337 len -= EXT4_MIN_INLINE_DATA_SIZE;
338 value = kzalloc(len, GFP_NOFS);
339 if (!value)
340 goto out;
341
342 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
343 value, len);
344 if (error == -ENODATA)
345 goto out;
346
liang xie5d601252014-05-12 22:06:43 -0400347 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500348 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
Tao Ma0d812f72012-12-10 14:06:02 -0500356 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500357 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
368out:
369 kfree(value);
370 brelse(is.iloc.bh);
371 return error;
372}
373
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400374static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
375 unsigned int len)
Tao Ma67cf5b02012-12-10 14:04:46 -0500376{
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
399static 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
liang xie5d601252014-05-12 22:06:43 -0400425 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500426 error = ext4_journal_get_write_access(handle, is.iloc.bh);
427 if (error)
428 goto out;
429
Tao Ma0d812f72012-12-10 14:06:02 -0500430 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500431 if (error)
432 goto out;
433
434 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
435 0, EXT4_MIN_INLINE_DATA_SIZE);
436
437 if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
438 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
439 if (S_ISDIR(inode->i_mode) ||
440 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
441 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
442 ext4_ext_tree_init(handle, inode);
443 }
444 }
445 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
446
447 get_bh(is.iloc.bh);
448 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
449
450 EXT4_I(inode)->i_inline_off = 0;
451 EXT4_I(inode)->i_inline_size = 0;
452 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
453out:
454 brelse(is.iloc.bh);
455 if (error == -ENODATA)
456 error = 0;
457 return error;
458}
459
Tao Ma46c7f252012-12-10 14:04:52 -0500460static int ext4_read_inline_page(struct inode *inode, struct page *page)
461{
462 void *kaddr;
463 int ret = 0;
464 size_t len;
465 struct ext4_iloc iloc;
466
467 BUG_ON(!PageLocked(page));
468 BUG_ON(!ext4_has_inline_data(inode));
469 BUG_ON(page->index);
470
471 if (!EXT4_I(inode)->i_inline_off) {
472 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
473 inode->i_ino);
474 goto out;
475 }
476
477 ret = ext4_get_inode_loc(inode, &iloc);
478 if (ret)
479 goto out;
480
481 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
482 kaddr = kmap_atomic(page);
483 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
484 flush_dcache_page(page);
485 kunmap_atomic(kaddr);
486 zero_user_segment(page, len, PAGE_CACHE_SIZE);
487 SetPageUptodate(page);
488 brelse(iloc.bh);
489
490out:
491 return ret;
492}
493
494int ext4_readpage_inline(struct inode *inode, struct page *page)
495{
496 int ret = 0;
497
498 down_read(&EXT4_I(inode)->xattr_sem);
499 if (!ext4_has_inline_data(inode)) {
500 up_read(&EXT4_I(inode)->xattr_sem);
501 return -EAGAIN;
502 }
503
504 /*
505 * Current inline data can only exist in the 1st page,
506 * So for all the other pages, just set them uptodate.
507 */
508 if (!page->index)
509 ret = ext4_read_inline_page(inode, page);
510 else if (!PageUptodate(page)) {
511 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
512 SetPageUptodate(page);
513 }
514
515 up_read(&EXT4_I(inode)->xattr_sem);
516
517 unlock_page(page);
518 return ret >= 0 ? 0 : ret;
519}
520
Tao Maf19d5872012-12-10 14:05:51 -0500521static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
522 struct inode *inode,
523 unsigned flags)
524{
525 int ret, needed_blocks;
526 handle_t *handle = NULL;
527 int retries = 0, sem_held = 0;
528 struct page *page = NULL;
529 unsigned from, to;
530 struct ext4_iloc iloc;
531
532 if (!ext4_has_inline_data(inode)) {
533 /*
534 * clear the flag so that no new write
535 * will trap here again.
536 */
537 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
538 return 0;
539 }
540
541 needed_blocks = ext4_writepage_trans_blocks(inode);
542
543 ret = ext4_get_inode_loc(inode, &iloc);
544 if (ret)
545 return ret;
546
547retry:
Theodore Ts'o9924a922013-02-08 21:59:22 -0500548 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
Tao Maf19d5872012-12-10 14:05:51 -0500549 if (IS_ERR(handle)) {
550 ret = PTR_ERR(handle);
551 handle = NULL;
552 goto out;
553 }
554
555 /* We cannot recurse into the filesystem as the transaction is already
556 * started */
557 flags |= AOP_FLAG_NOFS;
558
559 page = grab_cache_page_write_begin(mapping, 0, flags);
560 if (!page) {
561 ret = -ENOMEM;
562 goto out;
563 }
564
565 down_write(&EXT4_I(inode)->xattr_sem);
566 sem_held = 1;
567 /* If some one has already done this for us, just exit. */
568 if (!ext4_has_inline_data(inode)) {
569 ret = 0;
570 goto out;
571 }
572
573 from = 0;
574 to = ext4_get_inline_size(inode);
575 if (!PageUptodate(page)) {
576 ret = ext4_read_inline_page(inode, page);
577 if (ret < 0)
578 goto out;
579 }
580
581 ret = ext4_destroy_inline_data_nolock(handle, inode);
582 if (ret)
583 goto out;
584
585 if (ext4_should_dioread_nolock(inode))
586 ret = __block_write_begin(page, from, to, ext4_get_block_write);
587 else
588 ret = __block_write_begin(page, from, to, ext4_get_block);
589
590 if (!ret && ext4_should_journal_data(inode)) {
591 ret = ext4_walk_page_buffers(handle, page_buffers(page),
592 from, to, NULL,
593 do_journal_get_write_access);
594 }
595
596 if (ret) {
597 unlock_page(page);
598 page_cache_release(page);
Darrick J. Wong684de5742014-09-11 11:45:12 -0400599 page = NULL;
Tao Maf19d5872012-12-10 14:05:51 -0500600 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
Darrick J. Wong684de5742014-09-11 11:45:12 -0400619 if (page)
620 block_commit_write(page, from, to);
Tao Maf19d5872012-12-10 14:05:51 -0500621out:
622 if (page) {
623 unlock_page(page);
624 page_cache_release(page);
625 }
626 if (sem_held)
627 up_write(&EXT4_I(inode)->xattr_sem);
628 if (handle)
629 ext4_journal_stop(handle);
630 brelse(iloc.bh);
631 return ret;
632}
633
634/*
635 * Try to write data in the inode.
636 * If the inode has inline data, check whether the new write can be
637 * in the inode also. If not, create the page the handle, move the data
638 * to the page make it update and let the later codes create extent for it.
639 */
640int ext4_try_to_write_inline_data(struct address_space *mapping,
641 struct inode *inode,
642 loff_t pos, unsigned len,
643 unsigned flags,
644 struct page **pagep)
645{
646 int ret;
647 handle_t *handle;
648 struct page *page;
649 struct ext4_iloc iloc;
650
651 if (pos + len > ext4_get_max_inline_size(inode))
652 goto convert;
653
654 ret = ext4_get_inode_loc(inode, &iloc);
655 if (ret)
656 return ret;
657
658 /*
659 * The possible write could happen in the inode,
660 * so try to reserve the space in inode first.
661 */
Theodore Ts'o9924a922013-02-08 21:59:22 -0500662 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Tao Maf19d5872012-12-10 14:05:51 -0500663 if (IS_ERR(handle)) {
664 ret = PTR_ERR(handle);
665 handle = NULL;
666 goto out;
667 }
668
669 ret = ext4_prepare_inline_data(handle, inode, pos + len);
670 if (ret && ret != -ENOSPC)
671 goto out;
672
673 /* We don't have space in inline inode, so convert it to extent. */
674 if (ret == -ENOSPC) {
675 ext4_journal_stop(handle);
676 brelse(iloc.bh);
677 goto convert;
678 }
679
680 flags |= AOP_FLAG_NOFS;
681
682 page = grab_cache_page_write_begin(mapping, 0, flags);
683 if (!page) {
684 ret = -ENOMEM;
685 goto out;
686 }
687
688 *pagep = page;
689 down_read(&EXT4_I(inode)->xattr_sem);
690 if (!ext4_has_inline_data(inode)) {
691 ret = 0;
692 unlock_page(page);
693 page_cache_release(page);
694 goto out_up_read;
695 }
696
697 if (!PageUptodate(page)) {
698 ret = ext4_read_inline_page(inode, page);
699 if (ret < 0)
700 goto out_up_read;
701 }
702
703 ret = 1;
704 handle = NULL;
705out_up_read:
706 up_read(&EXT4_I(inode)->xattr_sem);
707out:
708 if (handle)
709 ext4_journal_stop(handle);
710 brelse(iloc.bh);
711 return ret;
712convert:
713 return ext4_convert_inline_data_to_extent(mapping,
714 inode, flags);
715}
716
717int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
718 unsigned copied, struct page *page)
719{
720 int ret;
721 void *kaddr;
722 struct ext4_iloc iloc;
723
724 if (unlikely(copied < len)) {
725 if (!PageUptodate(page)) {
726 copied = 0;
727 goto out;
728 }
729 }
730
731 ret = ext4_get_inode_loc(inode, &iloc);
732 if (ret) {
733 ext4_std_error(inode->i_sb, ret);
734 copied = 0;
735 goto out;
736 }
737
738 down_write(&EXT4_I(inode)->xattr_sem);
739 BUG_ON(!ext4_has_inline_data(inode));
740
741 kaddr = kmap_atomic(page);
742 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
743 kunmap_atomic(kaddr);
744 SetPageUptodate(page);
745 /* clear page dirty so that writepages wouldn't work for us. */
746 ClearPageDirty(page);
747
748 up_write(&EXT4_I(inode)->xattr_sem);
749 brelse(iloc.bh);
750out:
751 return copied;
752}
753
Tao Ma3fdcfb62012-12-10 14:05:57 -0500754struct buffer_head *
755ext4_journalled_write_inline_data(struct inode *inode,
756 unsigned len,
757 struct page *page)
758{
759 int ret;
760 void *kaddr;
761 struct ext4_iloc iloc;
762
763 ret = ext4_get_inode_loc(inode, &iloc);
764 if (ret) {
765 ext4_std_error(inode->i_sb, ret);
766 return NULL;
767 }
768
769 down_write(&EXT4_I(inode)->xattr_sem);
770 kaddr = kmap_atomic(page);
771 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
772 kunmap_atomic(kaddr);
773 up_write(&EXT4_I(inode)->xattr_sem);
774
775 return iloc.bh;
776}
777
Tao Ma9c3569b2012-12-10 14:05:57 -0500778/*
779 * Try to make the page cache and handle ready for the inline data case.
780 * We can call this function in 2 cases:
781 * 1. The inode is created and the first write exceeds inline size. We can
782 * clear the inode state safely.
783 * 2. The inode has inline data, then we need to read the data, make it
784 * update and dirty so that ext4_da_writepages can handle it. We don't
785 * need to start the journal since the file's metatdata isn't changed now.
786 */
787static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
788 struct inode *inode,
789 unsigned flags,
790 void **fsdata)
791{
792 int ret = 0, inline_size;
793 struct page *page;
794
795 page = grab_cache_page_write_begin(mapping, 0, flags);
796 if (!page)
797 return -ENOMEM;
798
799 down_read(&EXT4_I(inode)->xattr_sem);
800 if (!ext4_has_inline_data(inode)) {
801 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
802 goto out;
803 }
804
805 inline_size = ext4_get_inline_size(inode);
806
807 if (!PageUptodate(page)) {
808 ret = ext4_read_inline_page(inode, page);
809 if (ret < 0)
810 goto out;
811 }
812
813 ret = __block_write_begin(page, 0, inline_size,
814 ext4_da_get_block_prep);
815 if (ret) {
Dmitry Monakhov50db71a2014-12-05 21:37:15 -0500816 up_read(&EXT4_I(inode)->xattr_sem);
817 unlock_page(page);
818 page_cache_release(page);
Tao Ma9c3569b2012-12-10 14:05:57 -0500819 ext4_truncate_failed_write(inode);
Dmitry Monakhov50db71a2014-12-05 21:37:15 -0500820 return ret;
Tao Ma9c3569b2012-12-10 14:05:57 -0500821 }
822
823 SetPageDirty(page);
824 SetPageUptodate(page);
825 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
826 *fsdata = (void *)CONVERT_INLINE_DATA;
827
828out:
829 up_read(&EXT4_I(inode)->xattr_sem);
830 if (page) {
831 unlock_page(page);
832 page_cache_release(page);
833 }
834 return ret;
835}
836
837/*
838 * Prepare the write for the inline data.
839 * If the the data can be written into the inode, we just read
840 * the page and make it uptodate, and start the journal.
841 * Otherwise read the page, makes it dirty so that it can be
842 * handle in writepages(the i_disksize update is left to the
843 * normal ext4_da_write_end).
844 */
845int ext4_da_write_inline_data_begin(struct address_space *mapping,
846 struct inode *inode,
847 loff_t pos, unsigned len,
848 unsigned flags,
849 struct page **pagep,
850 void **fsdata)
851{
852 int ret, inline_size;
853 handle_t *handle;
854 struct page *page;
855 struct ext4_iloc iloc;
Jan Karabc0ca9df2014-01-06 14:02:23 -0500856 int retries;
Tao Ma9c3569b2012-12-10 14:05:57 -0500857
858 ret = ext4_get_inode_loc(inode, &iloc);
859 if (ret)
860 return ret;
861
Jan Karabc0ca9df2014-01-06 14:02:23 -0500862retry_journal:
Theodore Ts'o9924a922013-02-08 21:59:22 -0500863 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Tao Ma9c3569b2012-12-10 14:05:57 -0500864 if (IS_ERR(handle)) {
865 ret = PTR_ERR(handle);
Tao Ma9c3569b2012-12-10 14:05:57 -0500866 goto out;
867 }
868
869 inline_size = ext4_get_max_inline_size(inode);
870
871 ret = -ENOSPC;
872 if (inline_size >= pos + len) {
873 ret = ext4_prepare_inline_data(handle, inode, pos + len);
874 if (ret && ret != -ENOSPC)
Jan Kara52e44772014-01-06 14:03:23 -0500875 goto out_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500876 }
877
Dmitry Monakhov5cc28a92014-12-02 16:09:50 -0500878 /*
879 * We cannot recurse into the filesystem as the transaction
880 * is already started.
881 */
882 flags |= AOP_FLAG_NOFS;
883
Tao Ma9c3569b2012-12-10 14:05:57 -0500884 if (ret == -ENOSPC) {
885 ret = ext4_da_convert_inline_data_to_extent(mapping,
886 inode,
887 flags,
888 fsdata);
Jan Karabc0ca9df2014-01-06 14:02:23 -0500889 ext4_journal_stop(handle);
Jan Karabc0ca9df2014-01-06 14:02:23 -0500890 if (ret == -ENOSPC &&
891 ext4_should_retry_alloc(inode->i_sb, &retries))
892 goto retry_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500893 goto out;
894 }
895
Tao Ma9c3569b2012-12-10 14:05:57 -0500896
897 page = grab_cache_page_write_begin(mapping, 0, flags);
898 if (!page) {
899 ret = -ENOMEM;
Jan Kara52e44772014-01-06 14:03:23 -0500900 goto out_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500901 }
902
903 down_read(&EXT4_I(inode)->xattr_sem);
904 if (!ext4_has_inline_data(inode)) {
905 ret = 0;
906 goto out_release_page;
907 }
908
909 if (!PageUptodate(page)) {
910 ret = ext4_read_inline_page(inode, page);
911 if (ret < 0)
912 goto out_release_page;
913 }
914
915 up_read(&EXT4_I(inode)->xattr_sem);
916 *pagep = page;
Tao Ma9c3569b2012-12-10 14:05:57 -0500917 brelse(iloc.bh);
918 return 1;
919out_release_page:
920 up_read(&EXT4_I(inode)->xattr_sem);
921 unlock_page(page);
922 page_cache_release(page);
Jan Kara52e44772014-01-06 14:03:23 -0500923out_journal:
924 ext4_journal_stop(handle);
Tao Ma9c3569b2012-12-10 14:05:57 -0500925out:
Tao Ma9c3569b2012-12-10 14:05:57 -0500926 brelse(iloc.bh);
927 return ret;
928}
929
930int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
931 unsigned len, unsigned copied,
932 struct page *page)
933{
934 int i_size_changed = 0;
935
936 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
937
938 /*
939 * No need to use i_size_read() here, the i_size
940 * cannot change under us because we hold i_mutex.
941 *
942 * But it's important to update i_size while still holding page lock:
943 * page writeout could otherwise come in and zero beyond i_size.
944 */
945 if (pos+copied > inode->i_size) {
946 i_size_write(inode, pos+copied);
947 i_size_changed = 1;
948 }
949 unlock_page(page);
950 page_cache_release(page);
951
952 /*
953 * Don't mark the inode dirty under page lock. First, it unnecessarily
954 * makes the holding time of page lock longer. Second, it forces lock
955 * ordering of page lock and transaction start for journaling
956 * filesystems.
957 */
958 if (i_size_changed)
959 mark_inode_dirty(inode);
960
961 return copied;
962}
Tao Maf19d5872012-12-10 14:05:51 -0500963
Tao Ma3c47d542012-12-10 14:05:59 -0500964#ifdef INLINE_DIR_DEBUG
965void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
966 void *inline_start, int inline_size)
967{
968 int offset;
969 unsigned short de_len;
970 struct ext4_dir_entry_2 *de = inline_start;
971 void *dlimit = inline_start + inline_size;
972
973 trace_printk("inode %lu\n", dir->i_ino);
974 offset = 0;
975 while ((void *)de < dlimit) {
976 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
Rasmus Villemoes80cfb712015-04-02 16:42:43 -0400977 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
Tao Ma3c47d542012-12-10 14:05:59 -0500978 offset, de_len, de->name_len, de->name,
979 de->name_len, le32_to_cpu(de->inode));
980 if (ext4_check_dir_entry(dir, NULL, de, bh,
981 inline_start, inline_size, offset))
982 BUG();
983
984 offset += de_len;
985 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
986 }
987}
988#else
989#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
990#endif
991
992/*
993 * Add a new entry into a inline dir.
994 * It will return -ENOSPC if no space is available, and -EIO
995 * and -EEXIST if directory entry already exists.
996 */
997static int ext4_add_dirent_to_inline(handle_t *handle,
998 struct dentry *dentry,
999 struct inode *inode,
1000 struct ext4_iloc *iloc,
1001 void *inline_start, int inline_size)
1002{
David Howells2b0143b2015-03-17 22:25:59 +00001003 struct inode *dir = d_inode(dentry->d_parent);
Tao Ma3c47d542012-12-10 14:05:59 -05001004 const char *name = dentry->d_name.name;
1005 int namelen = dentry->d_name.len;
Tao Ma3c47d542012-12-10 14:05:59 -05001006 int err;
1007 struct ext4_dir_entry_2 *de;
1008
Tao Ma3c47d542012-12-10 14:05:59 -05001009 err = ext4_find_dest_de(dir, inode, iloc->bh,
1010 inline_start, inline_size,
1011 name, namelen, &de);
1012 if (err)
1013 return err;
1014
liang xie5d601252014-05-12 22:06:43 -04001015 BUFFER_TRACE(iloc->bh, "get_write_access");
Tao Ma3c47d542012-12-10 14:05:59 -05001016 err = ext4_journal_get_write_access(handle, iloc->bh);
1017 if (err)
1018 return err;
Michael Halcrow4bdfc872015-04-12 00:56:28 -04001019 ext4_insert_dentry(dir, inode, de, inline_size, &dentry->d_name,
1020 name, namelen);
Tao Ma3c47d542012-12-10 14:05:59 -05001021
1022 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1023
1024 /*
1025 * XXX shouldn't update any times until successful
1026 * completion of syscall, but too many callers depend
1027 * on this.
1028 *
1029 * XXX similarly, too many callers depend on
1030 * ext4_new_inode() setting the times, but error
1031 * recovery deletes the inode, so the worst that can
1032 * happen is that the times are slightly out of date
1033 * and/or different from the directory change time.
1034 */
1035 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1036 ext4_update_dx_flag(dir);
1037 dir->i_version++;
1038 ext4_mark_inode_dirty(handle, dir);
1039 return 1;
1040}
1041
1042static void *ext4_get_inline_xattr_pos(struct inode *inode,
1043 struct ext4_iloc *iloc)
1044{
1045 struct ext4_xattr_entry *entry;
1046 struct ext4_xattr_ibody_header *header;
1047
1048 BUG_ON(!EXT4_I(inode)->i_inline_off);
1049
1050 header = IHDR(inode, ext4_raw_inode(iloc));
1051 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1052 EXT4_I(inode)->i_inline_off);
1053
1054 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1055}
1056
1057/* Set the final de to cover the whole block. */
1058static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1059{
1060 struct ext4_dir_entry_2 *de, *prev_de;
1061 void *limit;
1062 int de_len;
1063
1064 de = (struct ext4_dir_entry_2 *)de_buf;
1065 if (old_size) {
1066 limit = de_buf + old_size;
1067 do {
1068 prev_de = de;
1069 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1070 de_buf += de_len;
1071 de = (struct ext4_dir_entry_2 *)de_buf;
1072 } while (de_buf < limit);
1073
1074 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1075 old_size, new_size);
1076 } else {
1077 /* this is just created, so create an empty entry. */
1078 de->inode = 0;
1079 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1080 }
1081}
1082
1083static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1084 struct ext4_iloc *iloc)
1085{
1086 int ret;
1087 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1088 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1089
1090 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1091 return -ENOSPC;
1092
1093 ret = ext4_update_inline_data(handle, dir,
1094 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1095 if (ret)
1096 return ret;
1097
1098 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1099 EXT4_I(dir)->i_inline_size -
1100 EXT4_MIN_INLINE_DATA_SIZE);
1101 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1102 return 0;
1103}
1104
1105static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1106 struct ext4_iloc *iloc,
1107 void *buf, int inline_size)
1108{
1109 ext4_create_inline_data(handle, inode, inline_size);
1110 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1111 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1112}
1113
1114static int ext4_finish_convert_inline_dir(handle_t *handle,
1115 struct inode *inode,
1116 struct buffer_head *dir_block,
1117 void *buf,
1118 int inline_size)
1119{
1120 int err, csum_size = 0, header_size = 0;
1121 struct ext4_dir_entry_2 *de;
1122 struct ext4_dir_entry_tail *t;
1123 void *target = dir_block->b_data;
1124
1125 /*
1126 * First create "." and ".." and then copy the dir information
1127 * back to the block.
1128 */
1129 de = (struct ext4_dir_entry_2 *)target;
1130 de = ext4_init_dot_dotdot(inode, de,
1131 inode->i_sb->s_blocksize, csum_size,
1132 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1133 header_size = (void *)de - target;
1134
1135 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1136 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1137
Dmitry Monakhov9aa5d322014-10-13 03:36:16 -04001138 if (ext4_has_metadata_csum(inode->i_sb))
Tao Ma3c47d542012-12-10 14:05:59 -05001139 csum_size = sizeof(struct ext4_dir_entry_tail);
1140
1141 inode->i_size = inode->i_sb->s_blocksize;
1142 i_size_write(inode, inode->i_sb->s_blocksize);
1143 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1144 ext4_update_final_de(dir_block->b_data,
1145 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1146 inode->i_sb->s_blocksize - csum_size);
1147
1148 if (csum_size) {
1149 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1150 inode->i_sb->s_blocksize);
1151 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1152 }
1153 set_buffer_uptodate(dir_block);
1154 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1155 if (err)
1156 goto out;
1157 set_buffer_verified(dir_block);
1158out:
1159 return err;
1160}
1161
1162static int ext4_convert_inline_data_nolock(handle_t *handle,
1163 struct inode *inode,
1164 struct ext4_iloc *iloc)
1165{
1166 int error;
1167 void *buf = NULL;
1168 struct buffer_head *data_bh = NULL;
1169 struct ext4_map_blocks map;
1170 int inline_size;
1171
1172 inline_size = ext4_get_inline_size(inode);
1173 buf = kmalloc(inline_size, GFP_NOFS);
1174 if (!buf) {
1175 error = -ENOMEM;
1176 goto out;
1177 }
1178
1179 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1180 if (error < 0)
1181 goto out;
1182
Darrick J. Wong40b163f2014-07-28 13:06:26 -04001183 /*
1184 * Make sure the inline directory entries pass checks before we try to
1185 * convert them, so that we avoid touching stuff that needs fsck.
1186 */
1187 if (S_ISDIR(inode->i_mode)) {
1188 error = ext4_check_all_de(inode, iloc->bh,
1189 buf + EXT4_INLINE_DOTDOT_SIZE,
1190 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1191 if (error)
1192 goto out;
1193 }
1194
Tao Ma3c47d542012-12-10 14:05:59 -05001195 error = ext4_destroy_inline_data_nolock(handle, inode);
1196 if (error)
1197 goto out;
1198
1199 map.m_lblk = 0;
1200 map.m_len = 1;
1201 map.m_flags = 0;
1202 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1203 if (error < 0)
1204 goto out_restore;
1205 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1206 error = -EIO;
1207 goto out_restore;
1208 }
1209
1210 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1211 if (!data_bh) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001212 error = -ENOMEM;
Tao Ma3c47d542012-12-10 14:05:59 -05001213 goto out_restore;
1214 }
1215
1216 lock_buffer(data_bh);
1217 error = ext4_journal_get_create_access(handle, data_bh);
1218 if (error) {
1219 unlock_buffer(data_bh);
1220 error = -EIO;
1221 goto out_restore;
1222 }
1223 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1224
1225 if (!S_ISDIR(inode->i_mode)) {
1226 memcpy(data_bh->b_data, buf, inline_size);
1227 set_buffer_uptodate(data_bh);
1228 error = ext4_handle_dirty_metadata(handle,
1229 inode, data_bh);
1230 } else {
1231 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1232 buf, inline_size);
1233 }
1234
1235 unlock_buffer(data_bh);
1236out_restore:
1237 if (error)
1238 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1239
1240out:
1241 brelse(data_bh);
1242 kfree(buf);
1243 return error;
1244}
1245
1246/*
1247 * Try to add the new entry to the inline data.
1248 * If succeeds, return 0. If not, extended the inline dir and copied data to
1249 * the new created block.
1250 */
1251int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1252 struct inode *inode)
1253{
1254 int ret, inline_size;
1255 void *inline_start;
1256 struct ext4_iloc iloc;
David Howells2b0143b2015-03-17 22:25:59 +00001257 struct inode *dir = d_inode(dentry->d_parent);
Tao Ma3c47d542012-12-10 14:05:59 -05001258
1259 ret = ext4_get_inode_loc(dir, &iloc);
1260 if (ret)
1261 return ret;
1262
1263 down_write(&EXT4_I(dir)->xattr_sem);
1264 if (!ext4_has_inline_data(dir))
1265 goto out;
1266
1267 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1268 EXT4_INLINE_DOTDOT_SIZE;
1269 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1270
1271 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1272 inline_start, inline_size);
1273 if (ret != -ENOSPC)
1274 goto out;
1275
1276 /* check whether it can be inserted to inline xattr space. */
1277 inline_size = EXT4_I(dir)->i_inline_size -
1278 EXT4_MIN_INLINE_DATA_SIZE;
1279 if (!inline_size) {
1280 /* Try to use the xattr space.*/
1281 ret = ext4_update_inline_dir(handle, dir, &iloc);
1282 if (ret && ret != -ENOSPC)
1283 goto out;
1284
1285 inline_size = EXT4_I(dir)->i_inline_size -
1286 EXT4_MIN_INLINE_DATA_SIZE;
1287 }
1288
1289 if (inline_size) {
1290 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1291
1292 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1293 inline_start, inline_size);
1294
1295 if (ret != -ENOSPC)
1296 goto out;
1297 }
1298
1299 /*
1300 * The inline space is filled up, so create a new block for it.
1301 * As the extent tree will be created, we have to save the inline
1302 * dir first.
1303 */
1304 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1305
1306out:
1307 ext4_mark_inode_dirty(handle, dir);
1308 up_write(&EXT4_I(dir)->xattr_sem);
1309 brelse(iloc.bh);
1310 return ret;
1311}
1312
Tao Ma8af0f082013-04-19 17:53:09 -04001313/*
1314 * This function fills a red-black tree with information from an
1315 * inlined dir. It returns the number directory entries loaded
1316 * into the tree. If there is an error it is returned in err.
1317 */
1318int htree_inlinedir_to_tree(struct file *dir_file,
1319 struct inode *dir, ext4_lblk_t block,
1320 struct dx_hash_info *hinfo,
1321 __u32 start_hash, __u32 start_minor_hash,
1322 int *has_inline_data)
1323{
1324 int err = 0, count = 0;
1325 unsigned int parent_ino;
1326 int pos;
1327 struct ext4_dir_entry_2 *de;
1328 struct inode *inode = file_inode(dir_file);
1329 int ret, inline_size = 0;
1330 struct ext4_iloc iloc;
1331 void *dir_buf = NULL;
1332 struct ext4_dir_entry_2 fake;
Theodore Ts'o2f618302015-04-12 00:56:26 -04001333 struct ext4_str tmp_str;
Tao Ma8af0f082013-04-19 17:53:09 -04001334
1335 ret = ext4_get_inode_loc(inode, &iloc);
1336 if (ret)
1337 return ret;
1338
1339 down_read(&EXT4_I(inode)->xattr_sem);
1340 if (!ext4_has_inline_data(inode)) {
1341 up_read(&EXT4_I(inode)->xattr_sem);
1342 *has_inline_data = 0;
1343 goto out;
1344 }
1345
1346 inline_size = ext4_get_inline_size(inode);
1347 dir_buf = kmalloc(inline_size, GFP_NOFS);
1348 if (!dir_buf) {
1349 ret = -ENOMEM;
1350 up_read(&EXT4_I(inode)->xattr_sem);
1351 goto out;
1352 }
1353
1354 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1355 up_read(&EXT4_I(inode)->xattr_sem);
1356 if (ret < 0)
1357 goto out;
1358
1359 pos = 0;
1360 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1361 while (pos < inline_size) {
1362 /*
1363 * As inlined dir doesn't store any information about '.' and
1364 * only the inode number of '..' is stored, we have to handle
1365 * them differently.
1366 */
1367 if (pos == 0) {
1368 fake.inode = cpu_to_le32(inode->i_ino);
1369 fake.name_len = 1;
1370 strcpy(fake.name, ".");
1371 fake.rec_len = ext4_rec_len_to_disk(
1372 EXT4_DIR_REC_LEN(fake.name_len),
1373 inline_size);
1374 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1375 de = &fake;
1376 pos = EXT4_INLINE_DOTDOT_OFFSET;
1377 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1378 fake.inode = cpu_to_le32(parent_ino);
1379 fake.name_len = 2;
1380 strcpy(fake.name, "..");
1381 fake.rec_len = ext4_rec_len_to_disk(
1382 EXT4_DIR_REC_LEN(fake.name_len),
1383 inline_size);
1384 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1385 de = &fake;
1386 pos = EXT4_INLINE_DOTDOT_SIZE;
1387 } else {
1388 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1389 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1390 if (ext4_check_dir_entry(inode, dir_file, de,
1391 iloc.bh, dir_buf,
1392 inline_size, pos)) {
1393 ret = count;
1394 goto out;
1395 }
1396 }
1397
1398 ext4fs_dirhash(de->name, de->name_len, hinfo);
1399 if ((hinfo->hash < start_hash) ||
1400 ((hinfo->hash == start_hash) &&
1401 (hinfo->minor_hash < start_minor_hash)))
1402 continue;
1403 if (de->inode == 0)
1404 continue;
Theodore Ts'o2f618302015-04-12 00:56:26 -04001405 tmp_str.name = de->name;
1406 tmp_str.len = de->name_len;
1407 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1408 hinfo->minor_hash, de, &tmp_str);
Tao Ma8af0f082013-04-19 17:53:09 -04001409 if (err) {
1410 count = err;
1411 goto out;
1412 }
1413 count++;
1414 }
1415 ret = count;
1416out:
1417 kfree(dir_buf);
1418 brelse(iloc.bh);
1419 return ret;
1420}
1421
Tao Mac4d8b022013-04-19 17:55:33 -04001422/*
1423 * So this function is called when the volume is mkfsed with
1424 * dir_index disabled. In order to keep f_pos persistent
1425 * after we convert from an inlined dir to a blocked based,
1426 * we just pretend that we are a normal dir and return the
1427 * offset as if '.' and '..' really take place.
1428 *
1429 */
Al Viro725bebb2013-05-17 16:08:53 -04001430int ext4_read_inline_dir(struct file *file,
1431 struct dir_context *ctx,
Tao Ma65d165d2012-12-10 14:05:59 -05001432 int *has_inline_data)
1433{
Tao Ma65d165d2012-12-10 14:05:59 -05001434 unsigned int offset, parent_ino;
Al Viro725bebb2013-05-17 16:08:53 -04001435 int i;
Tao Ma65d165d2012-12-10 14:05:59 -05001436 struct ext4_dir_entry_2 *de;
1437 struct super_block *sb;
Al Viro725bebb2013-05-17 16:08:53 -04001438 struct inode *inode = file_inode(file);
Tao Ma65d165d2012-12-10 14:05:59 -05001439 int ret, inline_size = 0;
1440 struct ext4_iloc iloc;
1441 void *dir_buf = NULL;
Tao Mac4d8b022013-04-19 17:55:33 -04001442 int dotdot_offset, dotdot_size, extra_offset, extra_size;
Tao Ma65d165d2012-12-10 14:05:59 -05001443
1444 ret = ext4_get_inode_loc(inode, &iloc);
1445 if (ret)
1446 return ret;
1447
1448 down_read(&EXT4_I(inode)->xattr_sem);
1449 if (!ext4_has_inline_data(inode)) {
1450 up_read(&EXT4_I(inode)->xattr_sem);
1451 *has_inline_data = 0;
1452 goto out;
1453 }
1454
1455 inline_size = ext4_get_inline_size(inode);
1456 dir_buf = kmalloc(inline_size, GFP_NOFS);
1457 if (!dir_buf) {
1458 ret = -ENOMEM;
1459 up_read(&EXT4_I(inode)->xattr_sem);
1460 goto out;
1461 }
1462
1463 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1464 up_read(&EXT4_I(inode)->xattr_sem);
1465 if (ret < 0)
1466 goto out;
1467
BoxiLiu48ffdab2013-10-30 08:07:20 -04001468 ret = 0;
Tao Ma65d165d2012-12-10 14:05:59 -05001469 sb = inode->i_sb;
Tao Ma65d165d2012-12-10 14:05:59 -05001470 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
Al Viro725bebb2013-05-17 16:08:53 -04001471 offset = ctx->pos;
Tao Ma65d165d2012-12-10 14:05:59 -05001472
Tao Mac4d8b022013-04-19 17:55:33 -04001473 /*
1474 * dotdot_offset and dotdot_size is the real offset and
1475 * size for ".." and "." if the dir is block based while
1476 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1477 * So we will use extra_offset and extra_size to indicate them
1478 * during the inline dir iteration.
1479 */
1480 dotdot_offset = EXT4_DIR_REC_LEN(1);
1481 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1482 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1483 extra_size = extra_offset + inline_size;
1484
Al Viro725bebb2013-05-17 16:08:53 -04001485 /*
1486 * If the version has changed since the last call to
1487 * readdir(2), then we might be pointing to an invalid
1488 * dirent right now. Scan from the start of the inline
1489 * dir to make sure.
1490 */
1491 if (file->f_version != inode->i_version) {
1492 for (i = 0; i < extra_size && i < offset;) {
1493 /*
1494 * "." is with offset 0 and
1495 * ".." is dotdot_offset.
1496 */
1497 if (!i) {
1498 i = dotdot_offset;
1499 continue;
1500 } else if (i == dotdot_offset) {
1501 i = dotdot_size;
Tao Mac4d8b022013-04-19 17:55:33 -04001502 continue;
1503 }
Al Viro725bebb2013-05-17 16:08:53 -04001504 /* for other entry, the real offset in
1505 * the buf has to be tuned accordingly.
1506 */
Tao Mac4d8b022013-04-19 17:55:33 -04001507 de = (struct ext4_dir_entry_2 *)
Al Viro725bebb2013-05-17 16:08:53 -04001508 (dir_buf + i - extra_offset);
1509 /* It's too expensive to do a full
1510 * dirent test each time round this
1511 * loop, but we do have to test at
1512 * least that it is non-zero. A
1513 * failure will be detected in the
1514 * dirent test below. */
1515 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1516 < EXT4_DIR_REC_LEN(1))
1517 break;
1518 i += ext4_rec_len_from_disk(de->rec_len,
1519 extra_size);
Tao Ma65d165d2012-12-10 14:05:59 -05001520 }
Al Viro725bebb2013-05-17 16:08:53 -04001521 offset = i;
1522 ctx->pos = offset;
1523 file->f_version = inode->i_version;
1524 }
1525
1526 while (ctx->pos < extra_size) {
1527 if (ctx->pos == 0) {
1528 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1529 goto out;
1530 ctx->pos = dotdot_offset;
1531 continue;
1532 }
1533
1534 if (ctx->pos == dotdot_offset) {
1535 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1536 goto out;
1537 ctx->pos = dotdot_size;
1538 continue;
1539 }
1540
1541 de = (struct ext4_dir_entry_2 *)
1542 (dir_buf + ctx->pos - extra_offset);
1543 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1544 extra_size, ctx->pos))
1545 goto out;
1546 if (le32_to_cpu(de->inode)) {
1547 if (!dir_emit(ctx, de->name, de->name_len,
1548 le32_to_cpu(de->inode),
1549 get_dtype(sb, de->file_type)))
1550 goto out;
1551 }
1552 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
Tao Ma65d165d2012-12-10 14:05:59 -05001553 }
1554out:
1555 kfree(dir_buf);
1556 brelse(iloc.bh);
1557 return ret;
1558}
1559
Tao Ma32f7f222012-12-10 14:06:01 -05001560struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1561 struct ext4_dir_entry_2 **parent_de,
1562 int *retval)
1563{
1564 struct ext4_iloc iloc;
1565
1566 *retval = ext4_get_inode_loc(inode, &iloc);
1567 if (*retval)
1568 return NULL;
1569
1570 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1571
1572 return iloc.bh;
1573}
1574
Tao Ma3c47d542012-12-10 14:05:59 -05001575/*
1576 * Try to create the inline data for the new dir.
1577 * If it succeeds, return 0, otherwise return the error.
1578 * In case of ENOSPC, the caller should create the normal disk layout dir.
1579 */
1580int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1581 struct inode *inode)
1582{
1583 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1584 struct ext4_iloc iloc;
1585 struct ext4_dir_entry_2 *de;
1586
1587 ret = ext4_get_inode_loc(inode, &iloc);
1588 if (ret)
1589 return ret;
1590
1591 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1592 if (ret)
1593 goto out;
1594
1595 /*
1596 * For inline dir, we only save the inode information for the ".."
1597 * and create a fake dentry to cover the left space.
1598 */
1599 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1600 de->inode = cpu_to_le32(parent->i_ino);
1601 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1602 de->inode = 0;
1603 de->rec_len = ext4_rec_len_to_disk(
1604 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1605 inline_size);
1606 set_nlink(inode, 2);
1607 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1608out:
1609 brelse(iloc.bh);
1610 return ret;
1611}
1612
Tao Mae8e948e2012-12-10 14:06:00 -05001613struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1614 const struct qstr *d_name,
1615 struct ext4_dir_entry_2 **res_dir,
1616 int *has_inline_data)
1617{
1618 int ret;
1619 struct ext4_iloc iloc;
1620 void *inline_start;
1621 int inline_size;
1622
1623 if (ext4_get_inode_loc(dir, &iloc))
1624 return NULL;
1625
1626 down_read(&EXT4_I(dir)->xattr_sem);
1627 if (!ext4_has_inline_data(dir)) {
1628 *has_inline_data = 0;
1629 goto out;
1630 }
1631
1632 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1633 EXT4_INLINE_DOTDOT_SIZE;
1634 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1635 ret = search_dir(iloc.bh, inline_start, inline_size,
1636 dir, d_name, 0, res_dir);
1637 if (ret == 1)
1638 goto out_find;
1639 if (ret < 0)
1640 goto out;
1641
1642 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1643 goto out;
1644
1645 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1646 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1647
1648 ret = search_dir(iloc.bh, inline_start, inline_size,
1649 dir, d_name, 0, res_dir);
1650 if (ret == 1)
1651 goto out_find;
1652
1653out:
1654 brelse(iloc.bh);
1655 iloc.bh = NULL;
1656out_find:
1657 up_read(&EXT4_I(dir)->xattr_sem);
1658 return iloc.bh;
1659}
1660
Tao Ma9f40fe52012-12-10 14:06:00 -05001661int ext4_delete_inline_entry(handle_t *handle,
1662 struct inode *dir,
1663 struct ext4_dir_entry_2 *de_del,
1664 struct buffer_head *bh,
1665 int *has_inline_data)
1666{
1667 int err, inline_size;
1668 struct ext4_iloc iloc;
1669 void *inline_start;
1670
1671 err = ext4_get_inode_loc(dir, &iloc);
1672 if (err)
1673 return err;
1674
1675 down_write(&EXT4_I(dir)->xattr_sem);
1676 if (!ext4_has_inline_data(dir)) {
1677 *has_inline_data = 0;
1678 goto out;
1679 }
1680
1681 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1682 EXT4_MIN_INLINE_DATA_SIZE) {
1683 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1684 EXT4_INLINE_DOTDOT_SIZE;
1685 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1686 EXT4_INLINE_DOTDOT_SIZE;
1687 } else {
1688 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1689 inline_size = ext4_get_inline_size(dir) -
1690 EXT4_MIN_INLINE_DATA_SIZE;
1691 }
1692
liang xie5d601252014-05-12 22:06:43 -04001693 BUFFER_TRACE(bh, "get_write_access");
Tao Ma9f40fe52012-12-10 14:06:00 -05001694 err = ext4_journal_get_write_access(handle, bh);
1695 if (err)
1696 goto out;
1697
1698 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1699 inline_start, inline_size, 0);
1700 if (err)
1701 goto out;
1702
1703 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1704 err = ext4_mark_inode_dirty(handle, dir);
1705 if (unlikely(err))
1706 goto out;
1707
1708 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1709out:
1710 up_write(&EXT4_I(dir)->xattr_sem);
1711 brelse(iloc.bh);
1712 if (err != -ENOENT)
1713 ext4_std_error(dir->i_sb, err);
1714 return err;
1715}
1716
Tao Ma61f86632012-12-10 14:06:01 -05001717/*
1718 * Get the inline dentry at offset.
1719 */
1720static inline struct ext4_dir_entry_2 *
1721ext4_get_inline_entry(struct inode *inode,
1722 struct ext4_iloc *iloc,
1723 unsigned int offset,
1724 void **inline_start,
1725 int *inline_size)
1726{
1727 void *inline_pos;
1728
1729 BUG_ON(offset > ext4_get_inline_size(inode));
1730
1731 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1732 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1733 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1734 } else {
1735 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1736 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1737 *inline_size = ext4_get_inline_size(inode) -
1738 EXT4_MIN_INLINE_DATA_SIZE;
1739 }
1740
1741 if (inline_start)
1742 *inline_start = inline_pos;
1743 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1744}
1745
1746int empty_inline_dir(struct inode *dir, int *has_inline_data)
1747{
1748 int err, inline_size;
1749 struct ext4_iloc iloc;
1750 void *inline_pos;
1751 unsigned int offset;
1752 struct ext4_dir_entry_2 *de;
1753 int ret = 1;
1754
1755 err = ext4_get_inode_loc(dir, &iloc);
1756 if (err) {
1757 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1758 err, dir->i_ino);
1759 return 1;
1760 }
1761
1762 down_read(&EXT4_I(dir)->xattr_sem);
1763 if (!ext4_has_inline_data(dir)) {
1764 *has_inline_data = 0;
1765 goto out;
1766 }
1767
1768 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1769 if (!le32_to_cpu(de->inode)) {
1770 ext4_warning(dir->i_sb,
1771 "bad inline directory (dir #%lu) - no `..'",
1772 dir->i_ino);
1773 ret = 1;
1774 goto out;
1775 }
1776
1777 offset = EXT4_INLINE_DOTDOT_SIZE;
1778 while (offset < dir->i_size) {
1779 de = ext4_get_inline_entry(dir, &iloc, offset,
1780 &inline_pos, &inline_size);
1781 if (ext4_check_dir_entry(dir, NULL, de,
1782 iloc.bh, inline_pos,
1783 inline_size, offset)) {
1784 ext4_warning(dir->i_sb,
1785 "bad inline directory (dir #%lu) - "
1786 "inode %u, rec_len %u, name_len %d"
1787 "inline size %d\n",
1788 dir->i_ino, le32_to_cpu(de->inode),
1789 le16_to_cpu(de->rec_len), de->name_len,
1790 inline_size);
1791 ret = 1;
1792 goto out;
1793 }
1794 if (le32_to_cpu(de->inode)) {
1795 ret = 0;
1796 goto out;
1797 }
1798 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1799 }
1800
1801out:
1802 up_read(&EXT4_I(dir)->xattr_sem);
1803 brelse(iloc.bh);
1804 return ret;
1805}
1806
Tao Ma67cf5b02012-12-10 14:04:46 -05001807int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1808{
1809 int ret;
1810
1811 down_write(&EXT4_I(inode)->xattr_sem);
1812 ret = ext4_destroy_inline_data_nolock(handle, inode);
1813 up_write(&EXT4_I(inode)->xattr_sem);
1814
1815 return ret;
1816}
Tao Ma94191982012-12-10 14:06:02 -05001817
1818int ext4_inline_data_fiemap(struct inode *inode,
1819 struct fiemap_extent_info *fieinfo,
Dmitry Monakhovd952d692014-12-02 16:11:20 -05001820 int *has_inline, __u64 start, __u64 len)
Tao Ma94191982012-12-10 14:06:02 -05001821{
1822 __u64 physical = 0;
Dmitry Monakhovd952d692014-12-02 16:11:20 -05001823 __u64 inline_len;
1824 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1825 FIEMAP_EXTENT_LAST;
Tao Ma94191982012-12-10 14:06:02 -05001826 int error = 0;
1827 struct ext4_iloc iloc;
1828
1829 down_read(&EXT4_I(inode)->xattr_sem);
1830 if (!ext4_has_inline_data(inode)) {
1831 *has_inline = 0;
1832 goto out;
1833 }
Dmitry Monakhovd952d692014-12-02 16:11:20 -05001834 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1835 i_size_read(inode));
1836 if (start >= inline_len)
1837 goto out;
1838 if (start + len < inline_len)
1839 inline_len = start + len;
1840 inline_len -= start;
Tao Ma94191982012-12-10 14:06:02 -05001841
1842 error = ext4_get_inode_loc(inode, &iloc);
1843 if (error)
1844 goto out;
1845
Jan Karaeaf37932013-05-31 19:33:42 -04001846 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
Tao Ma94191982012-12-10 14:06:02 -05001847 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1848 physical += offsetof(struct ext4_inode, i_block);
Tao Ma94191982012-12-10 14:06:02 -05001849
1850 if (physical)
Dmitry Monakhovd952d692014-12-02 16:11:20 -05001851 error = fiemap_fill_next_extent(fieinfo, start, physical,
1852 inline_len, flags);
Tao Ma94191982012-12-10 14:06:02 -05001853 brelse(iloc.bh);
1854out:
1855 up_read(&EXT4_I(inode)->xattr_sem);
1856 return (error < 0 ? error : 0);
1857}
Tao Ma0d812f72012-12-10 14:06:02 -05001858
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 */
1867int 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;
Tao Ma0d812f72012-12-10 14:06:02 -05001873 struct ext4_inode *raw_inode;
1874 struct ext4_iloc iloc;
1875
1876 error = ext4_get_inode_loc(inode, &iloc);
1877 if (error)
1878 return error;
1879
1880 raw_inode = ext4_raw_inode(&iloc);
Tao Ma0d812f72012-12-10 14:06:02 -05001881 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1882 EXT4_I(inode)->i_inline_off);
1883 if (EXT4_XATTR_LEN(entry->e_name_len) +
1884 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1885 error = -ENOSPC;
1886 goto out;
1887 }
1888
1889 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1890out:
1891 brelse(iloc.bh);
1892 return error;
1893}
Tao Maaef1c852012-12-10 14:06:02 -05001894
1895void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1896{
1897 handle_t *handle;
1898 int inline_size, value_len, needed_blocks;
1899 size_t i_size;
1900 void *value = NULL;
1901 struct ext4_xattr_ibody_find is = {
1902 .s = { .not_found = -ENODATA, },
1903 };
1904 struct ext4_xattr_info i = {
1905 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1906 .name = EXT4_XATTR_SYSTEM_DATA,
1907 };
1908
1909
1910 needed_blocks = ext4_writepage_trans_blocks(inode);
Theodore Ts'o9924a922013-02-08 21:59:22 -05001911 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
Tao Maaef1c852012-12-10 14:06:02 -05001912 if (IS_ERR(handle))
1913 return;
1914
1915 down_write(&EXT4_I(inode)->xattr_sem);
1916 if (!ext4_has_inline_data(inode)) {
1917 *has_inline = 0;
1918 ext4_journal_stop(handle);
1919 return;
1920 }
1921
1922 if (ext4_orphan_add(handle, inode))
1923 goto out;
1924
1925 if (ext4_get_inode_loc(inode, &is.iloc))
1926 goto out;
1927
1928 down_write(&EXT4_I(inode)->i_data_sem);
1929 i_size = inode->i_size;
1930 inline_size = ext4_get_inline_size(inode);
1931 EXT4_I(inode)->i_disksize = i_size;
1932
1933 if (i_size < inline_size) {
1934 /* Clear the content in the xattr space. */
1935 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1936 if (ext4_xattr_ibody_find(inode, &i, &is))
1937 goto out_error;
1938
1939 BUG_ON(is.s.not_found);
1940
1941 value_len = le32_to_cpu(is.s.here->e_value_size);
1942 value = kmalloc(value_len, GFP_NOFS);
1943 if (!value)
1944 goto out_error;
1945
1946 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1947 value, value_len))
1948 goto out_error;
1949
1950 i.value = value;
1951 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1952 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1953 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1954 goto out_error;
1955 }
1956
1957 /* Clear the content within i_blocks. */
Theodore Ts'o09c455a2014-01-07 12:58:19 -05001958 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1959 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1960 memset(p + i_size, 0,
1961 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1962 }
Tao Maaef1c852012-12-10 14:06:02 -05001963
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
1969out_error:
1970 up_write(&EXT4_I(inode)->i_data_sem);
1971out:
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}
Tao Ma0c8d4142012-12-10 14:06:03 -05001986
1987int 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
Theodore Ts'o9924a922013-02-08 21:59:22 -05002005 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
Tao Ma0c8d4142012-12-10 14:06:03 -05002006 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);
2019out:
2020 ext4_journal_stop(handle);
2021out_free:
2022 brelse(iloc.bh);
2023 return error;
2024}