blob: 141b6acbc51c3665e25b0fa6b9e4b9c01d8f3517 [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 */
14#include "ext4_jbd2.h"
15#include "ext4.h"
16#include "xattr.h"
Tao Maf19d5872012-12-10 14:05:51 -050017#include "truncate.h"
Tao Ma94191982012-12-10 14:06:02 -050018#include <linux/fiemap.h>
Tao Ma67cf5b02012-12-10 14:04:46 -050019
20#define EXT4_XATTR_SYSTEM_DATA "data"
21#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
Tao Ma8af0f082013-04-19 17:53:09 -040022#define EXT4_INLINE_DOTDOT_OFFSET 2
23#define EXT4_INLINE_DOTDOT_SIZE 4
Tao Ma67cf5b02012-12-10 14:04:46 -050024
Stephen Hemmingerc1978552014-05-12 10:50:23 -040025static int ext4_get_inline_size(struct inode *inode)
Tao Ma67cf5b02012-12-10 14:04:46 -050026{
27 if (EXT4_I(inode)->i_inline_off)
28 return EXT4_I(inode)->i_inline_size;
29
30 return 0;
31}
32
33static int get_max_inline_xattr_value_size(struct inode *inode,
34 struct ext4_iloc *iloc)
35{
36 struct ext4_xattr_ibody_header *header;
37 struct ext4_xattr_entry *entry;
38 struct ext4_inode *raw_inode;
39 int free, min_offs;
40
41 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
42 EXT4_GOOD_OLD_INODE_SIZE -
43 EXT4_I(inode)->i_extra_isize -
44 sizeof(struct ext4_xattr_ibody_header);
45
46 /*
47 * We need to subtract another sizeof(__u32) since an in-inode xattr
48 * needs an empty 4 bytes to indicate the gap between the xattr entry
49 * and the name/value pair.
50 */
51 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
52 return EXT4_XATTR_SIZE(min_offs -
53 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
54 EXT4_XATTR_ROUND - sizeof(__u32));
55
56 raw_inode = ext4_raw_inode(iloc);
57 header = IHDR(inode, raw_inode);
58 entry = IFIRST(header);
59
60 /* Compute min_offs. */
61 for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
62 if (!entry->e_value_block && entry->e_value_size) {
63 size_t offs = le16_to_cpu(entry->e_value_offs);
64 if (offs < min_offs)
65 min_offs = offs;
66 }
67 }
68 free = min_offs -
69 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
70
71 if (EXT4_I(inode)->i_inline_off) {
72 entry = (struct ext4_xattr_entry *)
73 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
74
boxi liuc4932db2013-07-01 08:12:37 -040075 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
Tao Ma67cf5b02012-12-10 14:04:46 -050076 goto out;
77 }
78
79 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
80
81 if (free > EXT4_XATTR_ROUND)
82 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
83 else
84 free = 0;
85
86out:
87 return free;
88}
89
90/*
91 * Get the maximum size we now can store in an inode.
92 * If we can't find the space for a xattr entry, don't use the space
93 * of the extents since we have no space to indicate the inline data.
94 */
95int ext4_get_max_inline_size(struct inode *inode)
96{
97 int error, max_inline_size;
98 struct ext4_iloc iloc;
99
100 if (EXT4_I(inode)->i_extra_isize == 0)
101 return 0;
102
103 error = ext4_get_inode_loc(inode, &iloc);
104 if (error) {
105 ext4_error_inode(inode, __func__, __LINE__, 0,
106 "can't get inode location %lu",
107 inode->i_ino);
108 return 0;
109 }
110
111 down_read(&EXT4_I(inode)->xattr_sem);
112 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
113 up_read(&EXT4_I(inode)->xattr_sem);
114
115 brelse(iloc.bh);
116
117 if (!max_inline_size)
118 return 0;
119
120 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
121}
122
Tao Ma67cf5b02012-12-10 14:04:46 -0500123/*
124 * this function does not take xattr_sem, which is OK because it is
125 * currently only used in a code path coming form ext4_iget, before
126 * the new inode has been unlocked
127 */
128int ext4_find_inline_data_nolock(struct inode *inode)
129{
130 struct ext4_xattr_ibody_find is = {
131 .s = { .not_found = -ENODATA, },
132 };
133 struct ext4_xattr_info i = {
134 .name_index = EXT4_XATTR_INDEX_SYSTEM,
135 .name = EXT4_XATTR_SYSTEM_DATA,
136 };
137 int error;
138
139 if (EXT4_I(inode)->i_extra_isize == 0)
140 return 0;
141
142 error = ext4_get_inode_loc(inode, &is.iloc);
143 if (error)
144 return error;
145
146 error = ext4_xattr_ibody_find(inode, &i, &is);
147 if (error)
148 goto out;
149
150 if (!is.s.not_found) {
151 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
152 (void *)ext4_raw_inode(&is.iloc));
153 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
154 le32_to_cpu(is.s.here->e_value_size);
155 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
156 }
157out:
158 brelse(is.iloc.bh);
159 return error;
160}
161
162static int ext4_read_inline_data(struct inode *inode, void *buffer,
163 unsigned int len,
164 struct ext4_iloc *iloc)
165{
166 struct ext4_xattr_entry *entry;
167 struct ext4_xattr_ibody_header *header;
168 int cp_len = 0;
169 struct ext4_inode *raw_inode;
170
171 if (!len)
172 return 0;
173
174 BUG_ON(len > EXT4_I(inode)->i_inline_size);
175
176 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
177 len : EXT4_MIN_INLINE_DATA_SIZE;
178
179 raw_inode = ext4_raw_inode(iloc);
180 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
181
182 len -= cp_len;
183 buffer += cp_len;
184
185 if (!len)
186 goto out;
187
188 header = IHDR(inode, raw_inode);
189 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
190 EXT4_I(inode)->i_inline_off);
191 len = min_t(unsigned int, len,
192 (unsigned int)le32_to_cpu(entry->e_value_size));
193
194 memcpy(buffer,
195 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
196 cp_len += len;
197
198out:
199 return cp_len;
200}
201
202/*
203 * write the buffer to the inline inode.
204 * If 'create' is set, we don't need to do the extra copy in the xattr
Tao Ma0d812f72012-12-10 14:06:02 -0500205 * value since it is already handled by ext4_xattr_ibody_inline_set.
206 * That saves us one memcpy.
Tao Ma67cf5b02012-12-10 14:04:46 -0500207 */
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400208static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
209 void *buffer, loff_t pos, unsigned int len)
Tao Ma67cf5b02012-12-10 14:04:46 -0500210{
211 struct ext4_xattr_entry *entry;
212 struct ext4_xattr_ibody_header *header;
213 struct ext4_inode *raw_inode;
214 int cp_len = 0;
215
216 BUG_ON(!EXT4_I(inode)->i_inline_off);
217 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
218
219 raw_inode = ext4_raw_inode(iloc);
220 buffer += pos;
221
222 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
223 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
224 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
225 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
226
227 len -= cp_len;
228 buffer += cp_len;
229 pos += cp_len;
230 }
231
232 if (!len)
233 return;
234
235 pos -= EXT4_MIN_INLINE_DATA_SIZE;
236 header = IHDR(inode, raw_inode);
237 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
238 EXT4_I(inode)->i_inline_off);
239
240 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
241 buffer, len);
242}
243
244static int ext4_create_inline_data(handle_t *handle,
245 struct inode *inode, unsigned len)
246{
247 int error;
248 void *value = NULL;
249 struct ext4_xattr_ibody_find is = {
250 .s = { .not_found = -ENODATA, },
251 };
252 struct ext4_xattr_info i = {
253 .name_index = EXT4_XATTR_INDEX_SYSTEM,
254 .name = EXT4_XATTR_SYSTEM_DATA,
255 };
256
257 error = ext4_get_inode_loc(inode, &is.iloc);
258 if (error)
259 return error;
260
liang xie5d601252014-05-12 22:06:43 -0400261 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500262 error = ext4_journal_get_write_access(handle, is.iloc.bh);
263 if (error)
264 goto out;
265
266 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
Theodore Ts'obd9926e2012-12-11 03:31:49 -0500267 value = EXT4_ZERO_XATTR_VALUE;
Tao Ma67cf5b02012-12-10 14:04:46 -0500268 len -= EXT4_MIN_INLINE_DATA_SIZE;
269 } else {
270 value = "";
271 len = 0;
272 }
273
274 /* Insert the the xttr entry. */
275 i.value = value;
276 i.value_len = len;
277
278 error = ext4_xattr_ibody_find(inode, &i, &is);
279 if (error)
280 goto out;
281
282 BUG_ON(!is.s.not_found);
283
Tao Ma0d812f72012-12-10 14:06:02 -0500284 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500285 if (error) {
286 if (error == -ENOSPC)
287 ext4_clear_inode_state(inode,
288 EXT4_STATE_MAY_INLINE_DATA);
289 goto out;
290 }
291
292 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
293 0, EXT4_MIN_INLINE_DATA_SIZE);
294
295 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
296 (void *)ext4_raw_inode(&is.iloc));
297 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
298 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
299 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
300 get_bh(is.iloc.bh);
301 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
302
303out:
304 brelse(is.iloc.bh);
305 return error;
306}
307
308static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
309 unsigned int len)
310{
311 int error;
312 void *value = NULL;
313 struct ext4_xattr_ibody_find is = {
314 .s = { .not_found = -ENODATA, },
315 };
316 struct ext4_xattr_info i = {
317 .name_index = EXT4_XATTR_INDEX_SYSTEM,
318 .name = EXT4_XATTR_SYSTEM_DATA,
319 };
320
321 /* If the old space is ok, write the data directly. */
322 if (len <= EXT4_I(inode)->i_inline_size)
323 return 0;
324
325 error = ext4_get_inode_loc(inode, &is.iloc);
326 if (error)
327 return error;
328
329 error = ext4_xattr_ibody_find(inode, &i, &is);
330 if (error)
331 goto out;
332
333 BUG_ON(is.s.not_found);
334
335 len -= EXT4_MIN_INLINE_DATA_SIZE;
336 value = kzalloc(len, GFP_NOFS);
337 if (!value)
338 goto out;
339
340 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
341 value, len);
342 if (error == -ENODATA)
343 goto out;
344
liang xie5d601252014-05-12 22:06:43 -0400345 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500346 error = ext4_journal_get_write_access(handle, is.iloc.bh);
347 if (error)
348 goto out;
349
350 /* Update the xttr entry. */
351 i.value = value;
352 i.value_len = len;
353
Tao Ma0d812f72012-12-10 14:06:02 -0500354 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500355 if (error)
356 goto out;
357
358 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
359 (void *)ext4_raw_inode(&is.iloc));
360 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
361 le32_to_cpu(is.s.here->e_value_size);
362 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
363 get_bh(is.iloc.bh);
364 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
365
366out:
367 kfree(value);
368 brelse(is.iloc.bh);
369 return error;
370}
371
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400372static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
373 unsigned int len)
Tao Ma67cf5b02012-12-10 14:04:46 -0500374{
375 int ret, size;
376 struct ext4_inode_info *ei = EXT4_I(inode);
377
378 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
379 return -ENOSPC;
380
381 size = ext4_get_max_inline_size(inode);
382 if (size < len)
383 return -ENOSPC;
384
385 down_write(&EXT4_I(inode)->xattr_sem);
386
387 if (ei->i_inline_off)
388 ret = ext4_update_inline_data(handle, inode, len);
389 else
390 ret = ext4_create_inline_data(handle, inode, len);
391
392 up_write(&EXT4_I(inode)->xattr_sem);
393
394 return ret;
395}
396
397static int ext4_destroy_inline_data_nolock(handle_t *handle,
398 struct inode *inode)
399{
400 struct ext4_inode_info *ei = EXT4_I(inode);
401 struct ext4_xattr_ibody_find is = {
402 .s = { .not_found = 0, },
403 };
404 struct ext4_xattr_info i = {
405 .name_index = EXT4_XATTR_INDEX_SYSTEM,
406 .name = EXT4_XATTR_SYSTEM_DATA,
407 .value = NULL,
408 .value_len = 0,
409 };
410 int error;
411
412 if (!ei->i_inline_off)
413 return 0;
414
415 error = ext4_get_inode_loc(inode, &is.iloc);
416 if (error)
417 return error;
418
419 error = ext4_xattr_ibody_find(inode, &i, &is);
420 if (error)
421 goto out;
422
liang xie5d601252014-05-12 22:06:43 -0400423 BUFFER_TRACE(is.iloc.bh, "get_write_access");
Tao Ma67cf5b02012-12-10 14:04:46 -0500424 error = ext4_journal_get_write_access(handle, is.iloc.bh);
425 if (error)
426 goto out;
427
Tao Ma0d812f72012-12-10 14:06:02 -0500428 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
Tao Ma67cf5b02012-12-10 14:04:46 -0500429 if (error)
430 goto out;
431
432 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
433 0, EXT4_MIN_INLINE_DATA_SIZE);
434
435 if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
436 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
437 if (S_ISDIR(inode->i_mode) ||
438 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
439 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
440 ext4_ext_tree_init(handle, inode);
441 }
442 }
443 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
444
445 get_bh(is.iloc.bh);
446 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
447
448 EXT4_I(inode)->i_inline_off = 0;
449 EXT4_I(inode)->i_inline_size = 0;
450 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
451out:
452 brelse(is.iloc.bh);
453 if (error == -ENODATA)
454 error = 0;
455 return error;
456}
457
Tao Ma46c7f252012-12-10 14:04:52 -0500458static int ext4_read_inline_page(struct inode *inode, struct page *page)
459{
460 void *kaddr;
461 int ret = 0;
462 size_t len;
463 struct ext4_iloc iloc;
464
465 BUG_ON(!PageLocked(page));
466 BUG_ON(!ext4_has_inline_data(inode));
467 BUG_ON(page->index);
468
469 if (!EXT4_I(inode)->i_inline_off) {
470 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
471 inode->i_ino);
472 goto out;
473 }
474
475 ret = ext4_get_inode_loc(inode, &iloc);
476 if (ret)
477 goto out;
478
479 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
480 kaddr = kmap_atomic(page);
481 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
482 flush_dcache_page(page);
483 kunmap_atomic(kaddr);
484 zero_user_segment(page, len, PAGE_CACHE_SIZE);
485 SetPageUptodate(page);
486 brelse(iloc.bh);
487
488out:
489 return ret;
490}
491
492int ext4_readpage_inline(struct inode *inode, struct page *page)
493{
494 int ret = 0;
495
496 down_read(&EXT4_I(inode)->xattr_sem);
497 if (!ext4_has_inline_data(inode)) {
498 up_read(&EXT4_I(inode)->xattr_sem);
499 return -EAGAIN;
500 }
501
502 /*
503 * Current inline data can only exist in the 1st page,
504 * So for all the other pages, just set them uptodate.
505 */
506 if (!page->index)
507 ret = ext4_read_inline_page(inode, page);
508 else if (!PageUptodate(page)) {
509 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
510 SetPageUptodate(page);
511 }
512
513 up_read(&EXT4_I(inode)->xattr_sem);
514
515 unlock_page(page);
516 return ret >= 0 ? 0 : ret;
517}
518
Tao Maf19d5872012-12-10 14:05:51 -0500519static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
520 struct inode *inode,
521 unsigned flags)
522{
523 int ret, needed_blocks;
524 handle_t *handle = NULL;
525 int retries = 0, sem_held = 0;
526 struct page *page = NULL;
527 unsigned from, to;
528 struct ext4_iloc iloc;
529
530 if (!ext4_has_inline_data(inode)) {
531 /*
532 * clear the flag so that no new write
533 * will trap here again.
534 */
535 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
536 return 0;
537 }
538
539 needed_blocks = ext4_writepage_trans_blocks(inode);
540
541 ret = ext4_get_inode_loc(inode, &iloc);
542 if (ret)
543 return ret;
544
545retry:
Theodore Ts'o9924a922013-02-08 21:59:22 -0500546 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
Tao Maf19d5872012-12-10 14:05:51 -0500547 if (IS_ERR(handle)) {
548 ret = PTR_ERR(handle);
549 handle = NULL;
550 goto out;
551 }
552
553 /* We cannot recurse into the filesystem as the transaction is already
554 * started */
555 flags |= AOP_FLAG_NOFS;
556
557 page = grab_cache_page_write_begin(mapping, 0, flags);
558 if (!page) {
559 ret = -ENOMEM;
560 goto out;
561 }
562
563 down_write(&EXT4_I(inode)->xattr_sem);
564 sem_held = 1;
565 /* If some one has already done this for us, just exit. */
566 if (!ext4_has_inline_data(inode)) {
567 ret = 0;
568 goto out;
569 }
570
571 from = 0;
572 to = ext4_get_inline_size(inode);
573 if (!PageUptodate(page)) {
574 ret = ext4_read_inline_page(inode, page);
575 if (ret < 0)
576 goto out;
577 }
578
579 ret = ext4_destroy_inline_data_nolock(handle, inode);
580 if (ret)
581 goto out;
582
583 if (ext4_should_dioread_nolock(inode))
584 ret = __block_write_begin(page, from, to, ext4_get_block_write);
585 else
586 ret = __block_write_begin(page, from, to, ext4_get_block);
587
588 if (!ret && ext4_should_journal_data(inode)) {
589 ret = ext4_walk_page_buffers(handle, page_buffers(page),
590 from, to, NULL,
591 do_journal_get_write_access);
592 }
593
594 if (ret) {
595 unlock_page(page);
596 page_cache_release(page);
597 ext4_orphan_add(handle, inode);
598 up_write(&EXT4_I(inode)->xattr_sem);
599 sem_held = 0;
600 ext4_journal_stop(handle);
601 handle = NULL;
602 ext4_truncate_failed_write(inode);
603 /*
604 * If truncate failed early the inode might
605 * still be on the orphan list; we need to
606 * make sure the inode is removed from the
607 * orphan list in that case.
608 */
609 if (inode->i_nlink)
610 ext4_orphan_del(NULL, inode);
611 }
612
613 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
614 goto retry;
615
616 block_commit_write(page, from, to);
617out:
618 if (page) {
619 unlock_page(page);
620 page_cache_release(page);
621 }
622 if (sem_held)
623 up_write(&EXT4_I(inode)->xattr_sem);
624 if (handle)
625 ext4_journal_stop(handle);
626 brelse(iloc.bh);
627 return ret;
628}
629
630/*
631 * Try to write data in the inode.
632 * If the inode has inline data, check whether the new write can be
633 * in the inode also. If not, create the page the handle, move the data
634 * to the page make it update and let the later codes create extent for it.
635 */
636int ext4_try_to_write_inline_data(struct address_space *mapping,
637 struct inode *inode,
638 loff_t pos, unsigned len,
639 unsigned flags,
640 struct page **pagep)
641{
642 int ret;
643 handle_t *handle;
644 struct page *page;
645 struct ext4_iloc iloc;
646
647 if (pos + len > ext4_get_max_inline_size(inode))
648 goto convert;
649
650 ret = ext4_get_inode_loc(inode, &iloc);
651 if (ret)
652 return ret;
653
654 /*
655 * The possible write could happen in the inode,
656 * so try to reserve the space in inode first.
657 */
Theodore Ts'o9924a922013-02-08 21:59:22 -0500658 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Tao Maf19d5872012-12-10 14:05:51 -0500659 if (IS_ERR(handle)) {
660 ret = PTR_ERR(handle);
661 handle = NULL;
662 goto out;
663 }
664
665 ret = ext4_prepare_inline_data(handle, inode, pos + len);
666 if (ret && ret != -ENOSPC)
667 goto out;
668
669 /* We don't have space in inline inode, so convert it to extent. */
670 if (ret == -ENOSPC) {
671 ext4_journal_stop(handle);
672 brelse(iloc.bh);
673 goto convert;
674 }
675
676 flags |= AOP_FLAG_NOFS;
677
678 page = grab_cache_page_write_begin(mapping, 0, flags);
679 if (!page) {
680 ret = -ENOMEM;
681 goto out;
682 }
683
684 *pagep = page;
685 down_read(&EXT4_I(inode)->xattr_sem);
686 if (!ext4_has_inline_data(inode)) {
687 ret = 0;
688 unlock_page(page);
689 page_cache_release(page);
690 goto out_up_read;
691 }
692
693 if (!PageUptodate(page)) {
694 ret = ext4_read_inline_page(inode, page);
695 if (ret < 0)
696 goto out_up_read;
697 }
698
699 ret = 1;
700 handle = NULL;
701out_up_read:
702 up_read(&EXT4_I(inode)->xattr_sem);
703out:
704 if (handle)
705 ext4_journal_stop(handle);
706 brelse(iloc.bh);
707 return ret;
708convert:
709 return ext4_convert_inline_data_to_extent(mapping,
710 inode, flags);
711}
712
713int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
714 unsigned copied, struct page *page)
715{
716 int ret;
717 void *kaddr;
718 struct ext4_iloc iloc;
719
720 if (unlikely(copied < len)) {
721 if (!PageUptodate(page)) {
722 copied = 0;
723 goto out;
724 }
725 }
726
727 ret = ext4_get_inode_loc(inode, &iloc);
728 if (ret) {
729 ext4_std_error(inode->i_sb, ret);
730 copied = 0;
731 goto out;
732 }
733
734 down_write(&EXT4_I(inode)->xattr_sem);
735 BUG_ON(!ext4_has_inline_data(inode));
736
737 kaddr = kmap_atomic(page);
738 ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
739 kunmap_atomic(kaddr);
740 SetPageUptodate(page);
741 /* clear page dirty so that writepages wouldn't work for us. */
742 ClearPageDirty(page);
743
744 up_write(&EXT4_I(inode)->xattr_sem);
745 brelse(iloc.bh);
746out:
747 return copied;
748}
749
Tao Ma3fdcfb62012-12-10 14:05:57 -0500750struct buffer_head *
751ext4_journalled_write_inline_data(struct inode *inode,
752 unsigned len,
753 struct page *page)
754{
755 int ret;
756 void *kaddr;
757 struct ext4_iloc iloc;
758
759 ret = ext4_get_inode_loc(inode, &iloc);
760 if (ret) {
761 ext4_std_error(inode->i_sb, ret);
762 return NULL;
763 }
764
765 down_write(&EXT4_I(inode)->xattr_sem);
766 kaddr = kmap_atomic(page);
767 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
768 kunmap_atomic(kaddr);
769 up_write(&EXT4_I(inode)->xattr_sem);
770
771 return iloc.bh;
772}
773
Tao Ma9c3569b2012-12-10 14:05:57 -0500774/*
775 * Try to make the page cache and handle ready for the inline data case.
776 * We can call this function in 2 cases:
777 * 1. The inode is created and the first write exceeds inline size. We can
778 * clear the inode state safely.
779 * 2. The inode has inline data, then we need to read the data, make it
780 * update and dirty so that ext4_da_writepages can handle it. We don't
781 * need to start the journal since the file's metatdata isn't changed now.
782 */
783static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
784 struct inode *inode,
785 unsigned flags,
786 void **fsdata)
787{
788 int ret = 0, inline_size;
789 struct page *page;
790
791 page = grab_cache_page_write_begin(mapping, 0, flags);
792 if (!page)
793 return -ENOMEM;
794
795 down_read(&EXT4_I(inode)->xattr_sem);
796 if (!ext4_has_inline_data(inode)) {
797 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
798 goto out;
799 }
800
801 inline_size = ext4_get_inline_size(inode);
802
803 if (!PageUptodate(page)) {
804 ret = ext4_read_inline_page(inode, page);
805 if (ret < 0)
806 goto out;
807 }
808
809 ret = __block_write_begin(page, 0, inline_size,
810 ext4_da_get_block_prep);
811 if (ret) {
812 ext4_truncate_failed_write(inode);
813 goto out;
814 }
815
816 SetPageDirty(page);
817 SetPageUptodate(page);
818 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
819 *fsdata = (void *)CONVERT_INLINE_DATA;
820
821out:
822 up_read(&EXT4_I(inode)->xattr_sem);
823 if (page) {
824 unlock_page(page);
825 page_cache_release(page);
826 }
827 return ret;
828}
829
830/*
831 * Prepare the write for the inline data.
832 * If the the data can be written into the inode, we just read
833 * the page and make it uptodate, and start the journal.
834 * Otherwise read the page, makes it dirty so that it can be
835 * handle in writepages(the i_disksize update is left to the
836 * normal ext4_da_write_end).
837 */
838int ext4_da_write_inline_data_begin(struct address_space *mapping,
839 struct inode *inode,
840 loff_t pos, unsigned len,
841 unsigned flags,
842 struct page **pagep,
843 void **fsdata)
844{
845 int ret, inline_size;
846 handle_t *handle;
847 struct page *page;
848 struct ext4_iloc iloc;
Jan Karabc0ca9df2014-01-06 14:02:23 -0500849 int retries;
Tao Ma9c3569b2012-12-10 14:05:57 -0500850
851 ret = ext4_get_inode_loc(inode, &iloc);
852 if (ret)
853 return ret;
854
Jan Karabc0ca9df2014-01-06 14:02:23 -0500855retry_journal:
Theodore Ts'o9924a922013-02-08 21:59:22 -0500856 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
Tao Ma9c3569b2012-12-10 14:05:57 -0500857 if (IS_ERR(handle)) {
858 ret = PTR_ERR(handle);
Tao Ma9c3569b2012-12-10 14:05:57 -0500859 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)
Jan Kara52e44772014-01-06 14:03:23 -0500868 goto out_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500869 }
870
871 if (ret == -ENOSPC) {
872 ret = ext4_da_convert_inline_data_to_extent(mapping,
873 inode,
874 flags,
875 fsdata);
Jan Karabc0ca9df2014-01-06 14:02:23 -0500876 ext4_journal_stop(handle);
Jan Karabc0ca9df2014-01-06 14:02:23 -0500877 if (ret == -ENOSPC &&
878 ext4_should_retry_alloc(inode->i_sb, &retries))
879 goto retry_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500880 goto out;
881 }
882
883 /*
884 * We cannot recurse into the filesystem as the transaction
885 * is already started.
886 */
887 flags |= AOP_FLAG_NOFS;
888
889 page = grab_cache_page_write_begin(mapping, 0, flags);
890 if (!page) {
891 ret = -ENOMEM;
Jan Kara52e44772014-01-06 14:03:23 -0500892 goto out_journal;
Tao Ma9c3569b2012-12-10 14:05:57 -0500893 }
894
895 down_read(&EXT4_I(inode)->xattr_sem);
896 if (!ext4_has_inline_data(inode)) {
897 ret = 0;
898 goto out_release_page;
899 }
900
901 if (!PageUptodate(page)) {
902 ret = ext4_read_inline_page(inode, page);
903 if (ret < 0)
904 goto out_release_page;
905 }
906
907 up_read(&EXT4_I(inode)->xattr_sem);
908 *pagep = page;
Tao Ma9c3569b2012-12-10 14:05:57 -0500909 brelse(iloc.bh);
910 return 1;
911out_release_page:
912 up_read(&EXT4_I(inode)->xattr_sem);
913 unlock_page(page);
914 page_cache_release(page);
Jan Kara52e44772014-01-06 14:03:23 -0500915out_journal:
916 ext4_journal_stop(handle);
Tao Ma9c3569b2012-12-10 14:05:57 -0500917out:
Tao Ma9c3569b2012-12-10 14:05:57 -0500918 brelse(iloc.bh);
919 return ret;
920}
921
922int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
923 unsigned len, unsigned copied,
924 struct page *page)
925{
926 int i_size_changed = 0;
927
928 copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
929
930 /*
931 * No need to use i_size_read() here, the i_size
932 * cannot change under us because we hold i_mutex.
933 *
934 * But it's important to update i_size while still holding page lock:
935 * page writeout could otherwise come in and zero beyond i_size.
936 */
937 if (pos+copied > inode->i_size) {
938 i_size_write(inode, pos+copied);
939 i_size_changed = 1;
940 }
941 unlock_page(page);
942 page_cache_release(page);
943
944 /*
945 * Don't mark the inode dirty under page lock. First, it unnecessarily
946 * makes the holding time of page lock longer. Second, it forces lock
947 * ordering of page lock and transaction start for journaling
948 * filesystems.
949 */
950 if (i_size_changed)
951 mark_inode_dirty(inode);
952
953 return copied;
954}
Tao Maf19d5872012-12-10 14:05:51 -0500955
Tao Ma3c47d542012-12-10 14:05:59 -0500956#ifdef INLINE_DIR_DEBUG
957void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
958 void *inline_start, int inline_size)
959{
960 int offset;
961 unsigned short de_len;
962 struct ext4_dir_entry_2 *de = inline_start;
963 void *dlimit = inline_start + inline_size;
964
965 trace_printk("inode %lu\n", dir->i_ino);
966 offset = 0;
967 while ((void *)de < dlimit) {
968 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
969 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
970 offset, de_len, de->name_len, de->name,
971 de->name_len, le32_to_cpu(de->inode));
972 if (ext4_check_dir_entry(dir, NULL, de, bh,
973 inline_start, inline_size, offset))
974 BUG();
975
976 offset += de_len;
977 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
978 }
979}
980#else
981#define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
982#endif
983
984/*
985 * Add a new entry into a inline dir.
986 * It will return -ENOSPC if no space is available, and -EIO
987 * and -EEXIST if directory entry already exists.
988 */
989static int ext4_add_dirent_to_inline(handle_t *handle,
990 struct dentry *dentry,
991 struct inode *inode,
992 struct ext4_iloc *iloc,
993 void *inline_start, int inline_size)
994{
995 struct inode *dir = dentry->d_parent->d_inode;
996 const char *name = dentry->d_name.name;
997 int namelen = dentry->d_name.len;
Tao Ma3c47d542012-12-10 14:05:59 -0500998 int err;
999 struct ext4_dir_entry_2 *de;
1000
Tao Ma3c47d542012-12-10 14:05:59 -05001001 err = ext4_find_dest_de(dir, inode, iloc->bh,
1002 inline_start, inline_size,
1003 name, namelen, &de);
1004 if (err)
1005 return err;
1006
liang xie5d601252014-05-12 22:06:43 -04001007 BUFFER_TRACE(iloc->bh, "get_write_access");
Tao Ma3c47d542012-12-10 14:05:59 -05001008 err = ext4_journal_get_write_access(handle, iloc->bh);
1009 if (err)
1010 return err;
1011 ext4_insert_dentry(inode, de, inline_size, name, namelen);
1012
1013 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1014
1015 /*
1016 * XXX shouldn't update any times until successful
1017 * completion of syscall, but too many callers depend
1018 * on this.
1019 *
1020 * XXX similarly, too many callers depend on
1021 * ext4_new_inode() setting the times, but error
1022 * recovery deletes the inode, so the worst that can
1023 * happen is that the times are slightly out of date
1024 * and/or different from the directory change time.
1025 */
1026 dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1027 ext4_update_dx_flag(dir);
1028 dir->i_version++;
1029 ext4_mark_inode_dirty(handle, dir);
1030 return 1;
1031}
1032
1033static void *ext4_get_inline_xattr_pos(struct inode *inode,
1034 struct ext4_iloc *iloc)
1035{
1036 struct ext4_xattr_entry *entry;
1037 struct ext4_xattr_ibody_header *header;
1038
1039 BUG_ON(!EXT4_I(inode)->i_inline_off);
1040
1041 header = IHDR(inode, ext4_raw_inode(iloc));
1042 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1043 EXT4_I(inode)->i_inline_off);
1044
1045 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1046}
1047
1048/* Set the final de to cover the whole block. */
1049static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1050{
1051 struct ext4_dir_entry_2 *de, *prev_de;
1052 void *limit;
1053 int de_len;
1054
1055 de = (struct ext4_dir_entry_2 *)de_buf;
1056 if (old_size) {
1057 limit = de_buf + old_size;
1058 do {
1059 prev_de = de;
1060 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1061 de_buf += de_len;
1062 de = (struct ext4_dir_entry_2 *)de_buf;
1063 } while (de_buf < limit);
1064
1065 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1066 old_size, new_size);
1067 } else {
1068 /* this is just created, so create an empty entry. */
1069 de->inode = 0;
1070 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1071 }
1072}
1073
1074static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1075 struct ext4_iloc *iloc)
1076{
1077 int ret;
1078 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1079 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1080
1081 if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1082 return -ENOSPC;
1083
1084 ret = ext4_update_inline_data(handle, dir,
1085 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1086 if (ret)
1087 return ret;
1088
1089 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1090 EXT4_I(dir)->i_inline_size -
1091 EXT4_MIN_INLINE_DATA_SIZE);
1092 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1093 return 0;
1094}
1095
1096static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1097 struct ext4_iloc *iloc,
1098 void *buf, int inline_size)
1099{
1100 ext4_create_inline_data(handle, inode, inline_size);
1101 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1102 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1103}
1104
1105static int ext4_finish_convert_inline_dir(handle_t *handle,
1106 struct inode *inode,
1107 struct buffer_head *dir_block,
1108 void *buf,
1109 int inline_size)
1110{
1111 int err, csum_size = 0, header_size = 0;
1112 struct ext4_dir_entry_2 *de;
1113 struct ext4_dir_entry_tail *t;
1114 void *target = dir_block->b_data;
1115
1116 /*
1117 * First create "." and ".." and then copy the dir information
1118 * back to the block.
1119 */
1120 de = (struct ext4_dir_entry_2 *)target;
1121 de = ext4_init_dot_dotdot(inode, de,
1122 inode->i_sb->s_blocksize, csum_size,
1123 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1124 header_size = (void *)de - target;
1125
1126 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1127 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1128
1129 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1130 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1131 csum_size = sizeof(struct ext4_dir_entry_tail);
1132
1133 inode->i_size = inode->i_sb->s_blocksize;
1134 i_size_write(inode, inode->i_sb->s_blocksize);
1135 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1136 ext4_update_final_de(dir_block->b_data,
1137 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1138 inode->i_sb->s_blocksize - csum_size);
1139
1140 if (csum_size) {
1141 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1142 inode->i_sb->s_blocksize);
1143 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1144 }
1145 set_buffer_uptodate(dir_block);
1146 err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1147 if (err)
1148 goto out;
1149 set_buffer_verified(dir_block);
1150out:
1151 return err;
1152}
1153
1154static int ext4_convert_inline_data_nolock(handle_t *handle,
1155 struct inode *inode,
1156 struct ext4_iloc *iloc)
1157{
1158 int error;
1159 void *buf = NULL;
1160 struct buffer_head *data_bh = NULL;
1161 struct ext4_map_blocks map;
1162 int inline_size;
1163
1164 inline_size = ext4_get_inline_size(inode);
1165 buf = kmalloc(inline_size, GFP_NOFS);
1166 if (!buf) {
1167 error = -ENOMEM;
1168 goto out;
1169 }
1170
1171 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1172 if (error < 0)
1173 goto out;
1174
1175 error = ext4_destroy_inline_data_nolock(handle, inode);
1176 if (error)
1177 goto out;
1178
1179 map.m_lblk = 0;
1180 map.m_len = 1;
1181 map.m_flags = 0;
1182 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1183 if (error < 0)
1184 goto out_restore;
1185 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1186 error = -EIO;
1187 goto out_restore;
1188 }
1189
1190 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1191 if (!data_bh) {
Theodore Ts'o860d21e2013-01-12 16:19:36 -05001192 error = -ENOMEM;
Tao Ma3c47d542012-12-10 14:05:59 -05001193 goto out_restore;
1194 }
1195
1196 lock_buffer(data_bh);
1197 error = ext4_journal_get_create_access(handle, data_bh);
1198 if (error) {
1199 unlock_buffer(data_bh);
1200 error = -EIO;
1201 goto out_restore;
1202 }
1203 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1204
1205 if (!S_ISDIR(inode->i_mode)) {
1206 memcpy(data_bh->b_data, buf, inline_size);
1207 set_buffer_uptodate(data_bh);
1208 error = ext4_handle_dirty_metadata(handle,
1209 inode, data_bh);
1210 } else {
1211 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1212 buf, inline_size);
1213 }
1214
1215 unlock_buffer(data_bh);
1216out_restore:
1217 if (error)
1218 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1219
1220out:
1221 brelse(data_bh);
1222 kfree(buf);
1223 return error;
1224}
1225
1226/*
1227 * Try to add the new entry to the inline data.
1228 * If succeeds, return 0. If not, extended the inline dir and copied data to
1229 * the new created block.
1230 */
1231int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1232 struct inode *inode)
1233{
1234 int ret, inline_size;
1235 void *inline_start;
1236 struct ext4_iloc iloc;
1237 struct inode *dir = dentry->d_parent->d_inode;
1238
1239 ret = ext4_get_inode_loc(dir, &iloc);
1240 if (ret)
1241 return ret;
1242
1243 down_write(&EXT4_I(dir)->xattr_sem);
1244 if (!ext4_has_inline_data(dir))
1245 goto out;
1246
1247 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1248 EXT4_INLINE_DOTDOT_SIZE;
1249 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1250
1251 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1252 inline_start, inline_size);
1253 if (ret != -ENOSPC)
1254 goto out;
1255
1256 /* check whether it can be inserted to inline xattr space. */
1257 inline_size = EXT4_I(dir)->i_inline_size -
1258 EXT4_MIN_INLINE_DATA_SIZE;
1259 if (!inline_size) {
1260 /* Try to use the xattr space.*/
1261 ret = ext4_update_inline_dir(handle, dir, &iloc);
1262 if (ret && ret != -ENOSPC)
1263 goto out;
1264
1265 inline_size = EXT4_I(dir)->i_inline_size -
1266 EXT4_MIN_INLINE_DATA_SIZE;
1267 }
1268
1269 if (inline_size) {
1270 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1271
1272 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1273 inline_start, inline_size);
1274
1275 if (ret != -ENOSPC)
1276 goto out;
1277 }
1278
1279 /*
1280 * The inline space is filled up, so create a new block for it.
1281 * As the extent tree will be created, we have to save the inline
1282 * dir first.
1283 */
1284 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1285
1286out:
1287 ext4_mark_inode_dirty(handle, dir);
1288 up_write(&EXT4_I(dir)->xattr_sem);
1289 brelse(iloc.bh);
1290 return ret;
1291}
1292
Tao Ma8af0f082013-04-19 17:53:09 -04001293/*
1294 * This function fills a red-black tree with information from an
1295 * inlined dir. It returns the number directory entries loaded
1296 * into the tree. If there is an error it is returned in err.
1297 */
1298int htree_inlinedir_to_tree(struct file *dir_file,
1299 struct inode *dir, ext4_lblk_t block,
1300 struct dx_hash_info *hinfo,
1301 __u32 start_hash, __u32 start_minor_hash,
1302 int *has_inline_data)
1303{
1304 int err = 0, count = 0;
1305 unsigned int parent_ino;
1306 int pos;
1307 struct ext4_dir_entry_2 *de;
1308 struct inode *inode = file_inode(dir_file);
1309 int ret, inline_size = 0;
1310 struct ext4_iloc iloc;
1311 void *dir_buf = NULL;
1312 struct ext4_dir_entry_2 fake;
1313
1314 ret = ext4_get_inode_loc(inode, &iloc);
1315 if (ret)
1316 return ret;
1317
1318 down_read(&EXT4_I(inode)->xattr_sem);
1319 if (!ext4_has_inline_data(inode)) {
1320 up_read(&EXT4_I(inode)->xattr_sem);
1321 *has_inline_data = 0;
1322 goto out;
1323 }
1324
1325 inline_size = ext4_get_inline_size(inode);
1326 dir_buf = kmalloc(inline_size, GFP_NOFS);
1327 if (!dir_buf) {
1328 ret = -ENOMEM;
1329 up_read(&EXT4_I(inode)->xattr_sem);
1330 goto out;
1331 }
1332
1333 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1334 up_read(&EXT4_I(inode)->xattr_sem);
1335 if (ret < 0)
1336 goto out;
1337
1338 pos = 0;
1339 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1340 while (pos < inline_size) {
1341 /*
1342 * As inlined dir doesn't store any information about '.' and
1343 * only the inode number of '..' is stored, we have to handle
1344 * them differently.
1345 */
1346 if (pos == 0) {
1347 fake.inode = cpu_to_le32(inode->i_ino);
1348 fake.name_len = 1;
1349 strcpy(fake.name, ".");
1350 fake.rec_len = ext4_rec_len_to_disk(
1351 EXT4_DIR_REC_LEN(fake.name_len),
1352 inline_size);
1353 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1354 de = &fake;
1355 pos = EXT4_INLINE_DOTDOT_OFFSET;
1356 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1357 fake.inode = cpu_to_le32(parent_ino);
1358 fake.name_len = 2;
1359 strcpy(fake.name, "..");
1360 fake.rec_len = ext4_rec_len_to_disk(
1361 EXT4_DIR_REC_LEN(fake.name_len),
1362 inline_size);
1363 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1364 de = &fake;
1365 pos = EXT4_INLINE_DOTDOT_SIZE;
1366 } else {
1367 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1368 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1369 if (ext4_check_dir_entry(inode, dir_file, de,
1370 iloc.bh, dir_buf,
1371 inline_size, pos)) {
1372 ret = count;
1373 goto out;
1374 }
1375 }
1376
1377 ext4fs_dirhash(de->name, de->name_len, hinfo);
1378 if ((hinfo->hash < start_hash) ||
1379 ((hinfo->hash == start_hash) &&
1380 (hinfo->minor_hash < start_minor_hash)))
1381 continue;
1382 if (de->inode == 0)
1383 continue;
1384 err = ext4_htree_store_dirent(dir_file,
1385 hinfo->hash, hinfo->minor_hash, de);
1386 if (err) {
1387 count = err;
1388 goto out;
1389 }
1390 count++;
1391 }
1392 ret = count;
1393out:
1394 kfree(dir_buf);
1395 brelse(iloc.bh);
1396 return ret;
1397}
1398
Tao Mac4d8b022013-04-19 17:55:33 -04001399/*
1400 * So this function is called when the volume is mkfsed with
1401 * dir_index disabled. In order to keep f_pos persistent
1402 * after we convert from an inlined dir to a blocked based,
1403 * we just pretend that we are a normal dir and return the
1404 * offset as if '.' and '..' really take place.
1405 *
1406 */
Al Viro725bebb2013-05-17 16:08:53 -04001407int ext4_read_inline_dir(struct file *file,
1408 struct dir_context *ctx,
Tao Ma65d165d2012-12-10 14:05:59 -05001409 int *has_inline_data)
1410{
Tao Ma65d165d2012-12-10 14:05:59 -05001411 unsigned int offset, parent_ino;
Al Viro725bebb2013-05-17 16:08:53 -04001412 int i;
Tao Ma65d165d2012-12-10 14:05:59 -05001413 struct ext4_dir_entry_2 *de;
1414 struct super_block *sb;
Al Viro725bebb2013-05-17 16:08:53 -04001415 struct inode *inode = file_inode(file);
Tao Ma65d165d2012-12-10 14:05:59 -05001416 int ret, inline_size = 0;
1417 struct ext4_iloc iloc;
1418 void *dir_buf = NULL;
Tao Mac4d8b022013-04-19 17:55:33 -04001419 int dotdot_offset, dotdot_size, extra_offset, extra_size;
Tao Ma65d165d2012-12-10 14:05:59 -05001420
1421 ret = ext4_get_inode_loc(inode, &iloc);
1422 if (ret)
1423 return ret;
1424
1425 down_read(&EXT4_I(inode)->xattr_sem);
1426 if (!ext4_has_inline_data(inode)) {
1427 up_read(&EXT4_I(inode)->xattr_sem);
1428 *has_inline_data = 0;
1429 goto out;
1430 }
1431
1432 inline_size = ext4_get_inline_size(inode);
1433 dir_buf = kmalloc(inline_size, GFP_NOFS);
1434 if (!dir_buf) {
1435 ret = -ENOMEM;
1436 up_read(&EXT4_I(inode)->xattr_sem);
1437 goto out;
1438 }
1439
1440 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1441 up_read(&EXT4_I(inode)->xattr_sem);
1442 if (ret < 0)
1443 goto out;
1444
BoxiLiu48ffdab2013-10-30 08:07:20 -04001445 ret = 0;
Tao Ma65d165d2012-12-10 14:05:59 -05001446 sb = inode->i_sb;
Tao Ma65d165d2012-12-10 14:05:59 -05001447 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
Al Viro725bebb2013-05-17 16:08:53 -04001448 offset = ctx->pos;
Tao Ma65d165d2012-12-10 14:05:59 -05001449
Tao Mac4d8b022013-04-19 17:55:33 -04001450 /*
1451 * dotdot_offset and dotdot_size is the real offset and
1452 * size for ".." and "." if the dir is block based while
1453 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1454 * So we will use extra_offset and extra_size to indicate them
1455 * during the inline dir iteration.
1456 */
1457 dotdot_offset = EXT4_DIR_REC_LEN(1);
1458 dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1459 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1460 extra_size = extra_offset + inline_size;
1461
Al Viro725bebb2013-05-17 16:08:53 -04001462 /*
1463 * If the version has changed since the last call to
1464 * readdir(2), then we might be pointing to an invalid
1465 * dirent right now. Scan from the start of the inline
1466 * dir to make sure.
1467 */
1468 if (file->f_version != inode->i_version) {
1469 for (i = 0; i < extra_size && i < offset;) {
1470 /*
1471 * "." is with offset 0 and
1472 * ".." is dotdot_offset.
1473 */
1474 if (!i) {
1475 i = dotdot_offset;
1476 continue;
1477 } else if (i == dotdot_offset) {
1478 i = dotdot_size;
Tao Mac4d8b022013-04-19 17:55:33 -04001479 continue;
1480 }
Al Viro725bebb2013-05-17 16:08:53 -04001481 /* for other entry, the real offset in
1482 * the buf has to be tuned accordingly.
1483 */
Tao Mac4d8b022013-04-19 17:55:33 -04001484 de = (struct ext4_dir_entry_2 *)
Al Viro725bebb2013-05-17 16:08:53 -04001485 (dir_buf + i - extra_offset);
1486 /* It's too expensive to do a full
1487 * dirent test each time round this
1488 * loop, but we do have to test at
1489 * least that it is non-zero. A
1490 * failure will be detected in the
1491 * dirent test below. */
1492 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1493 < EXT4_DIR_REC_LEN(1))
1494 break;
1495 i += ext4_rec_len_from_disk(de->rec_len,
1496 extra_size);
Tao Ma65d165d2012-12-10 14:05:59 -05001497 }
Al Viro725bebb2013-05-17 16:08:53 -04001498 offset = i;
1499 ctx->pos = offset;
1500 file->f_version = inode->i_version;
1501 }
1502
1503 while (ctx->pos < extra_size) {
1504 if (ctx->pos == 0) {
1505 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1506 goto out;
1507 ctx->pos = dotdot_offset;
1508 continue;
1509 }
1510
1511 if (ctx->pos == dotdot_offset) {
1512 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1513 goto out;
1514 ctx->pos = dotdot_size;
1515 continue;
1516 }
1517
1518 de = (struct ext4_dir_entry_2 *)
1519 (dir_buf + ctx->pos - extra_offset);
1520 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1521 extra_size, ctx->pos))
1522 goto out;
1523 if (le32_to_cpu(de->inode)) {
1524 if (!dir_emit(ctx, de->name, de->name_len,
1525 le32_to_cpu(de->inode),
1526 get_dtype(sb, de->file_type)))
1527 goto out;
1528 }
1529 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
Tao Ma65d165d2012-12-10 14:05:59 -05001530 }
1531out:
1532 kfree(dir_buf);
1533 brelse(iloc.bh);
1534 return ret;
1535}
1536
Tao Ma32f7f222012-12-10 14:06:01 -05001537struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1538 struct ext4_dir_entry_2 **parent_de,
1539 int *retval)
1540{
1541 struct ext4_iloc iloc;
1542
1543 *retval = ext4_get_inode_loc(inode, &iloc);
1544 if (*retval)
1545 return NULL;
1546
1547 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1548
1549 return iloc.bh;
1550}
1551
Tao Ma3c47d542012-12-10 14:05:59 -05001552/*
1553 * Try to create the inline data for the new dir.
1554 * If it succeeds, return 0, otherwise return the error.
1555 * In case of ENOSPC, the caller should create the normal disk layout dir.
1556 */
1557int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1558 struct inode *inode)
1559{
1560 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1561 struct ext4_iloc iloc;
1562 struct ext4_dir_entry_2 *de;
1563
1564 ret = ext4_get_inode_loc(inode, &iloc);
1565 if (ret)
1566 return ret;
1567
1568 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1569 if (ret)
1570 goto out;
1571
1572 /*
1573 * For inline dir, we only save the inode information for the ".."
1574 * and create a fake dentry to cover the left space.
1575 */
1576 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1577 de->inode = cpu_to_le32(parent->i_ino);
1578 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1579 de->inode = 0;
1580 de->rec_len = ext4_rec_len_to_disk(
1581 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1582 inline_size);
1583 set_nlink(inode, 2);
1584 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1585out:
1586 brelse(iloc.bh);
1587 return ret;
1588}
1589
Tao Mae8e948e2012-12-10 14:06:00 -05001590struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1591 const struct qstr *d_name,
1592 struct ext4_dir_entry_2 **res_dir,
1593 int *has_inline_data)
1594{
1595 int ret;
1596 struct ext4_iloc iloc;
1597 void *inline_start;
1598 int inline_size;
1599
1600 if (ext4_get_inode_loc(dir, &iloc))
1601 return NULL;
1602
1603 down_read(&EXT4_I(dir)->xattr_sem);
1604 if (!ext4_has_inline_data(dir)) {
1605 *has_inline_data = 0;
1606 goto out;
1607 }
1608
1609 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1610 EXT4_INLINE_DOTDOT_SIZE;
1611 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1612 ret = search_dir(iloc.bh, inline_start, inline_size,
1613 dir, d_name, 0, res_dir);
1614 if (ret == 1)
1615 goto out_find;
1616 if (ret < 0)
1617 goto out;
1618
1619 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1620 goto out;
1621
1622 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1623 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1624
1625 ret = search_dir(iloc.bh, inline_start, inline_size,
1626 dir, d_name, 0, res_dir);
1627 if (ret == 1)
1628 goto out_find;
1629
1630out:
1631 brelse(iloc.bh);
1632 iloc.bh = NULL;
1633out_find:
1634 up_read(&EXT4_I(dir)->xattr_sem);
1635 return iloc.bh;
1636}
1637
Tao Ma9f40fe52012-12-10 14:06:00 -05001638int ext4_delete_inline_entry(handle_t *handle,
1639 struct inode *dir,
1640 struct ext4_dir_entry_2 *de_del,
1641 struct buffer_head *bh,
1642 int *has_inline_data)
1643{
1644 int err, inline_size;
1645 struct ext4_iloc iloc;
1646 void *inline_start;
1647
1648 err = ext4_get_inode_loc(dir, &iloc);
1649 if (err)
1650 return err;
1651
1652 down_write(&EXT4_I(dir)->xattr_sem);
1653 if (!ext4_has_inline_data(dir)) {
1654 *has_inline_data = 0;
1655 goto out;
1656 }
1657
1658 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1659 EXT4_MIN_INLINE_DATA_SIZE) {
1660 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1661 EXT4_INLINE_DOTDOT_SIZE;
1662 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1663 EXT4_INLINE_DOTDOT_SIZE;
1664 } else {
1665 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1666 inline_size = ext4_get_inline_size(dir) -
1667 EXT4_MIN_INLINE_DATA_SIZE;
1668 }
1669
liang xie5d601252014-05-12 22:06:43 -04001670 BUFFER_TRACE(bh, "get_write_access");
Tao Ma9f40fe52012-12-10 14:06:00 -05001671 err = ext4_journal_get_write_access(handle, bh);
1672 if (err)
1673 goto out;
1674
1675 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1676 inline_start, inline_size, 0);
1677 if (err)
1678 goto out;
1679
1680 BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1681 err = ext4_mark_inode_dirty(handle, dir);
1682 if (unlikely(err))
1683 goto out;
1684
1685 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1686out:
1687 up_write(&EXT4_I(dir)->xattr_sem);
1688 brelse(iloc.bh);
1689 if (err != -ENOENT)
1690 ext4_std_error(dir->i_sb, err);
1691 return err;
1692}
1693
Tao Ma61f86632012-12-10 14:06:01 -05001694/*
1695 * Get the inline dentry at offset.
1696 */
1697static inline struct ext4_dir_entry_2 *
1698ext4_get_inline_entry(struct inode *inode,
1699 struct ext4_iloc *iloc,
1700 unsigned int offset,
1701 void **inline_start,
1702 int *inline_size)
1703{
1704 void *inline_pos;
1705
1706 BUG_ON(offset > ext4_get_inline_size(inode));
1707
1708 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1709 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1710 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1711 } else {
1712 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1713 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1714 *inline_size = ext4_get_inline_size(inode) -
1715 EXT4_MIN_INLINE_DATA_SIZE;
1716 }
1717
1718 if (inline_start)
1719 *inline_start = inline_pos;
1720 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1721}
1722
1723int empty_inline_dir(struct inode *dir, int *has_inline_data)
1724{
1725 int err, inline_size;
1726 struct ext4_iloc iloc;
1727 void *inline_pos;
1728 unsigned int offset;
1729 struct ext4_dir_entry_2 *de;
1730 int ret = 1;
1731
1732 err = ext4_get_inode_loc(dir, &iloc);
1733 if (err) {
1734 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1735 err, dir->i_ino);
1736 return 1;
1737 }
1738
1739 down_read(&EXT4_I(dir)->xattr_sem);
1740 if (!ext4_has_inline_data(dir)) {
1741 *has_inline_data = 0;
1742 goto out;
1743 }
1744
1745 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1746 if (!le32_to_cpu(de->inode)) {
1747 ext4_warning(dir->i_sb,
1748 "bad inline directory (dir #%lu) - no `..'",
1749 dir->i_ino);
1750 ret = 1;
1751 goto out;
1752 }
1753
1754 offset = EXT4_INLINE_DOTDOT_SIZE;
1755 while (offset < dir->i_size) {
1756 de = ext4_get_inline_entry(dir, &iloc, offset,
1757 &inline_pos, &inline_size);
1758 if (ext4_check_dir_entry(dir, NULL, de,
1759 iloc.bh, inline_pos,
1760 inline_size, offset)) {
1761 ext4_warning(dir->i_sb,
1762 "bad inline directory (dir #%lu) - "
1763 "inode %u, rec_len %u, name_len %d"
1764 "inline size %d\n",
1765 dir->i_ino, le32_to_cpu(de->inode),
1766 le16_to_cpu(de->rec_len), de->name_len,
1767 inline_size);
1768 ret = 1;
1769 goto out;
1770 }
1771 if (le32_to_cpu(de->inode)) {
1772 ret = 0;
1773 goto out;
1774 }
1775 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1776 }
1777
1778out:
1779 up_read(&EXT4_I(dir)->xattr_sem);
1780 brelse(iloc.bh);
1781 return ret;
1782}
1783
Tao Ma67cf5b02012-12-10 14:04:46 -05001784int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1785{
1786 int ret;
1787
1788 down_write(&EXT4_I(inode)->xattr_sem);
1789 ret = ext4_destroy_inline_data_nolock(handle, inode);
1790 up_write(&EXT4_I(inode)->xattr_sem);
1791
1792 return ret;
1793}
Tao Ma94191982012-12-10 14:06:02 -05001794
1795int ext4_inline_data_fiemap(struct inode *inode,
1796 struct fiemap_extent_info *fieinfo,
1797 int *has_inline)
1798{
1799 __u64 physical = 0;
1800 __u64 length;
1801 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1802 int error = 0;
1803 struct ext4_iloc iloc;
1804
1805 down_read(&EXT4_I(inode)->xattr_sem);
1806 if (!ext4_has_inline_data(inode)) {
1807 *has_inline = 0;
1808 goto out;
1809 }
1810
1811 error = ext4_get_inode_loc(inode, &iloc);
1812 if (error)
1813 goto out;
1814
Jan Karaeaf37932013-05-31 19:33:42 -04001815 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
Tao Ma94191982012-12-10 14:06:02 -05001816 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1817 physical += offsetof(struct ext4_inode, i_block);
1818 length = i_size_read(inode);
1819
1820 if (physical)
1821 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1822 length, flags);
1823 brelse(iloc.bh);
1824out:
1825 up_read(&EXT4_I(inode)->xattr_sem);
1826 return (error < 0 ? error : 0);
1827}
Tao Ma0d812f72012-12-10 14:06:02 -05001828
1829/*
1830 * Called during xattr set, and if we can sparse space 'needed',
1831 * just create the extent tree evict the data to the outer block.
1832 *
1833 * We use jbd2 instead of page cache to move data to the 1st block
1834 * so that the whole transaction can be committed as a whole and
1835 * the data isn't lost because of the delayed page cache write.
1836 */
1837int ext4_try_to_evict_inline_data(handle_t *handle,
1838 struct inode *inode,
1839 int needed)
1840{
1841 int error;
1842 struct ext4_xattr_entry *entry;
Tao Ma0d812f72012-12-10 14:06:02 -05001843 struct ext4_inode *raw_inode;
1844 struct ext4_iloc iloc;
1845
1846 error = ext4_get_inode_loc(inode, &iloc);
1847 if (error)
1848 return error;
1849
1850 raw_inode = ext4_raw_inode(&iloc);
Tao Ma0d812f72012-12-10 14:06:02 -05001851 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1852 EXT4_I(inode)->i_inline_off);
1853 if (EXT4_XATTR_LEN(entry->e_name_len) +
1854 EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1855 error = -ENOSPC;
1856 goto out;
1857 }
1858
1859 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1860out:
1861 brelse(iloc.bh);
1862 return error;
1863}
Tao Maaef1c852012-12-10 14:06:02 -05001864
1865void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1866{
1867 handle_t *handle;
1868 int inline_size, value_len, needed_blocks;
1869 size_t i_size;
1870 void *value = NULL;
1871 struct ext4_xattr_ibody_find is = {
1872 .s = { .not_found = -ENODATA, },
1873 };
1874 struct ext4_xattr_info i = {
1875 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1876 .name = EXT4_XATTR_SYSTEM_DATA,
1877 };
1878
1879
1880 needed_blocks = ext4_writepage_trans_blocks(inode);
Theodore Ts'o9924a922013-02-08 21:59:22 -05001881 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
Tao Maaef1c852012-12-10 14:06:02 -05001882 if (IS_ERR(handle))
1883 return;
1884
1885 down_write(&EXT4_I(inode)->xattr_sem);
1886 if (!ext4_has_inline_data(inode)) {
1887 *has_inline = 0;
1888 ext4_journal_stop(handle);
1889 return;
1890 }
1891
1892 if (ext4_orphan_add(handle, inode))
1893 goto out;
1894
1895 if (ext4_get_inode_loc(inode, &is.iloc))
1896 goto out;
1897
1898 down_write(&EXT4_I(inode)->i_data_sem);
1899 i_size = inode->i_size;
1900 inline_size = ext4_get_inline_size(inode);
1901 EXT4_I(inode)->i_disksize = i_size;
1902
1903 if (i_size < inline_size) {
1904 /* Clear the content in the xattr space. */
1905 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1906 if (ext4_xattr_ibody_find(inode, &i, &is))
1907 goto out_error;
1908
1909 BUG_ON(is.s.not_found);
1910
1911 value_len = le32_to_cpu(is.s.here->e_value_size);
1912 value = kmalloc(value_len, GFP_NOFS);
1913 if (!value)
1914 goto out_error;
1915
1916 if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1917 value, value_len))
1918 goto out_error;
1919
1920 i.value = value;
1921 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1922 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1923 if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1924 goto out_error;
1925 }
1926
1927 /* Clear the content within i_blocks. */
Theodore Ts'o09c455a2014-01-07 12:58:19 -05001928 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1929 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1930 memset(p + i_size, 0,
1931 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1932 }
Tao Maaef1c852012-12-10 14:06:02 -05001933
1934 EXT4_I(inode)->i_inline_size = i_size <
1935 EXT4_MIN_INLINE_DATA_SIZE ?
1936 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1937 }
1938
1939out_error:
1940 up_write(&EXT4_I(inode)->i_data_sem);
1941out:
1942 brelse(is.iloc.bh);
1943 up_write(&EXT4_I(inode)->xattr_sem);
1944 kfree(value);
1945 if (inode->i_nlink)
1946 ext4_orphan_del(handle, inode);
1947
1948 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1949 ext4_mark_inode_dirty(handle, inode);
1950 if (IS_SYNC(inode))
1951 ext4_handle_sync(handle);
1952
1953 ext4_journal_stop(handle);
1954 return;
1955}
Tao Ma0c8d4142012-12-10 14:06:03 -05001956
1957int ext4_convert_inline_data(struct inode *inode)
1958{
1959 int error, needed_blocks;
1960 handle_t *handle;
1961 struct ext4_iloc iloc;
1962
1963 if (!ext4_has_inline_data(inode)) {
1964 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1965 return 0;
1966 }
1967
1968 needed_blocks = ext4_writepage_trans_blocks(inode);
1969
1970 iloc.bh = NULL;
1971 error = ext4_get_inode_loc(inode, &iloc);
1972 if (error)
1973 return error;
1974
Theodore Ts'o9924a922013-02-08 21:59:22 -05001975 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
Tao Ma0c8d4142012-12-10 14:06:03 -05001976 if (IS_ERR(handle)) {
1977 error = PTR_ERR(handle);
1978 goto out_free;
1979 }
1980
1981 down_write(&EXT4_I(inode)->xattr_sem);
1982 if (!ext4_has_inline_data(inode)) {
1983 up_write(&EXT4_I(inode)->xattr_sem);
1984 goto out;
1985 }
1986
1987 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1988 up_write(&EXT4_I(inode)->xattr_sem);
1989out:
1990 ext4_journal_stop(handle);
1991out_free:
1992 brelse(iloc.bh);
1993 return error;
1994}