1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * Copyright (c) 2012 Taobao.
4 * Written by Tao Ma <boyu.mt@taobao.com>
5 */
6
7 #include <linux/iomap.h>
8 #include <linux/fiemap.h>
9 #include <linux/iversion.h>
10
11 #include "ext4_jbd2.h"
12 #include "ext4.h"
13 #include "xattr.h"
14 #include "truncate.h"
15 #include <trace/events/android_fs.h>
16
17 #define EXT4_XATTR_SYSTEM_DATA "data"
18 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
19 #define EXT4_INLINE_DOTDOT_OFFSET 2
20 #define EXT4_INLINE_DOTDOT_SIZE 4
21
ext4_get_inline_size(struct inode * inode)22 static int ext4_get_inline_size(struct inode *inode)
23 {
24 if (EXT4_I(inode)->i_inline_off)
25 return EXT4_I(inode)->i_inline_size;
26
27 return 0;
28 }
29
get_max_inline_xattr_value_size(struct inode * inode,struct ext4_iloc * iloc)30 static int get_max_inline_xattr_value_size(struct inode *inode,
31 struct ext4_iloc *iloc)
32 {
33 struct ext4_xattr_ibody_header *header;
34 struct ext4_xattr_entry *entry;
35 struct ext4_inode *raw_inode;
36 int free, min_offs;
37
38 if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
39 return 0;
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_inum && entry->e_value_size) {
63 size_t offs = le16_to_cpu(entry->e_value_offs);
64 if (offs < min_offs)
65 min_offs = offs;
66 }
67 }
68 free = min_offs -
69 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
70
71 if (EXT4_I(inode)->i_inline_off) {
72 entry = (struct ext4_xattr_entry *)
73 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
74
75 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
76 goto out;
77 }
78
79 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
80
81 if (free > EXT4_XATTR_ROUND)
82 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
83 else
84 free = 0;
85
86 out:
87 return free;
88 }
89
90 /*
91 * Get the maximum size we now can store in an inode.
92 * If we can't find the space for a xattr entry, don't use the space
93 * of the extents since we have no space to indicate the inline data.
94 */
ext4_get_max_inline_size(struct inode * inode)95 int ext4_get_max_inline_size(struct inode *inode)
96 {
97 int error, max_inline_size;
98 struct ext4_iloc iloc;
99
100 if (EXT4_I(inode)->i_extra_isize == 0)
101 return 0;
102
103 error = ext4_get_inode_loc(inode, &iloc);
104 if (error) {
105 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
106 "can't get inode location %lu",
107 inode->i_ino);
108 return 0;
109 }
110
111 down_read(&EXT4_I(inode)->xattr_sem);
112 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
113 up_read(&EXT4_I(inode)->xattr_sem);
114
115 brelse(iloc.bh);
116
117 if (!max_inline_size)
118 return 0;
119
120 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
121 }
122
123 /*
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 */
ext4_find_inline_data_nolock(struct inode * inode)128 int 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 if (is.s.here->e_value_inum) {
152 EXT4_ERROR_INODE(inode, "inline data xattr refers "
153 "to an external xattr inode");
154 error = -EFSCORRUPTED;
155 goto out;
156 }
157 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
158 (void *)ext4_raw_inode(&is.iloc));
159 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
160 le32_to_cpu(is.s.here->e_value_size);
161 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
162 }
163 out:
164 brelse(is.iloc.bh);
165 return error;
166 }
167
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
169 unsigned int len,
170 struct ext4_iloc *iloc)
171 {
172 struct ext4_xattr_entry *entry;
173 struct ext4_xattr_ibody_header *header;
174 int cp_len = 0;
175 struct ext4_inode *raw_inode;
176
177 if (!len)
178 return 0;
179
180 BUG_ON(len > EXT4_I(inode)->i_inline_size);
181
182 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
183 len : EXT4_MIN_INLINE_DATA_SIZE;
184
185 raw_inode = ext4_raw_inode(iloc);
186 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
187
188 len -= cp_len;
189 buffer += cp_len;
190
191 if (!len)
192 goto out;
193
194 header = IHDR(inode, raw_inode);
195 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
196 EXT4_I(inode)->i_inline_off);
197 len = min_t(unsigned int, len,
198 (unsigned int)le32_to_cpu(entry->e_value_size));
199
200 memcpy(buffer,
201 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
202 cp_len += len;
203
204 out:
205 return cp_len;
206 }
207
208 /*
209 * write the buffer to the inline inode.
210 * If 'create' is set, we don't need to do the extra copy in the xattr
211 * value since it is already handled by ext4_xattr_ibody_inline_set.
212 * That saves us one memcpy.
213 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)214 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
215 void *buffer, loff_t pos, unsigned int len)
216 {
217 struct ext4_xattr_entry *entry;
218 struct ext4_xattr_ibody_header *header;
219 struct ext4_inode *raw_inode;
220 int cp_len = 0;
221
222 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
223 return;
224
225 BUG_ON(!EXT4_I(inode)->i_inline_off);
226 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
227
228 raw_inode = ext4_raw_inode(iloc);
229 buffer += pos;
230
231 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
232 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
233 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
234 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
235
236 len -= cp_len;
237 buffer += cp_len;
238 pos += cp_len;
239 }
240
241 if (!len)
242 return;
243
244 pos -= EXT4_MIN_INLINE_DATA_SIZE;
245 header = IHDR(inode, raw_inode);
246 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
247 EXT4_I(inode)->i_inline_off);
248
249 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
250 buffer, len);
251 }
252
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)253 static int ext4_create_inline_data(handle_t *handle,
254 struct inode *inode, unsigned len)
255 {
256 int error;
257 void *value = NULL;
258 struct ext4_xattr_ibody_find is = {
259 .s = { .not_found = -ENODATA, },
260 };
261 struct ext4_xattr_info i = {
262 .name_index = EXT4_XATTR_INDEX_SYSTEM,
263 .name = EXT4_XATTR_SYSTEM_DATA,
264 };
265
266 error = ext4_get_inode_loc(inode, &is.iloc);
267 if (error)
268 return error;
269
270 BUFFER_TRACE(is.iloc.bh, "get_write_access");
271 error = ext4_journal_get_write_access(handle, is.iloc.bh);
272 if (error)
273 goto out;
274
275 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
276 value = EXT4_ZERO_XATTR_VALUE;
277 len -= EXT4_MIN_INLINE_DATA_SIZE;
278 } else {
279 value = "";
280 len = 0;
281 }
282
283 /* Insert the xttr entry. */
284 i.value = value;
285 i.value_len = len;
286
287 error = ext4_xattr_ibody_find(inode, &i, &is);
288 if (error)
289 goto out;
290
291 BUG_ON(!is.s.not_found);
292
293 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
294 if (error) {
295 if (error == -ENOSPC)
296 ext4_clear_inode_state(inode,
297 EXT4_STATE_MAY_INLINE_DATA);
298 goto out;
299 }
300
301 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
302 0, EXT4_MIN_INLINE_DATA_SIZE);
303
304 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
305 (void *)ext4_raw_inode(&is.iloc));
306 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
307 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
308 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
309 get_bh(is.iloc.bh);
310 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
311
312 out:
313 brelse(is.iloc.bh);
314 return error;
315 }
316
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)317 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
318 unsigned int len)
319 {
320 int error;
321 void *value = NULL;
322 struct ext4_xattr_ibody_find is = {
323 .s = { .not_found = -ENODATA, },
324 };
325 struct ext4_xattr_info i = {
326 .name_index = EXT4_XATTR_INDEX_SYSTEM,
327 .name = EXT4_XATTR_SYSTEM_DATA,
328 };
329
330 /* If the old space is ok, write the data directly. */
331 if (len <= EXT4_I(inode)->i_inline_size)
332 return 0;
333
334 error = ext4_get_inode_loc(inode, &is.iloc);
335 if (error)
336 return error;
337
338 error = ext4_xattr_ibody_find(inode, &i, &is);
339 if (error)
340 goto out;
341
342 BUG_ON(is.s.not_found);
343
344 len -= EXT4_MIN_INLINE_DATA_SIZE;
345 value = kzalloc(len, GFP_NOFS);
346 if (!value) {
347 error = -ENOMEM;
348 goto out;
349 }
350
351 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
352 value, len);
353 if (error == -ENODATA)
354 goto out;
355
356 BUFFER_TRACE(is.iloc.bh, "get_write_access");
357 error = ext4_journal_get_write_access(handle, is.iloc.bh);
358 if (error)
359 goto out;
360
361 /* Update the xattr entry. */
362 i.value = value;
363 i.value_len = len;
364
365 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
366 if (error)
367 goto out;
368
369 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
370 (void *)ext4_raw_inode(&is.iloc));
371 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
372 le32_to_cpu(is.s.here->e_value_size);
373 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
374 get_bh(is.iloc.bh);
375 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
376
377 out:
378 kfree(value);
379 brelse(is.iloc.bh);
380 return error;
381 }
382
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)383 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
384 unsigned int len)
385 {
386 int ret, size, no_expand;
387 struct ext4_inode_info *ei = EXT4_I(inode);
388
389 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
390 return -ENOSPC;
391
392 size = ext4_get_max_inline_size(inode);
393 if (size < len)
394 return -ENOSPC;
395
396 ext4_write_lock_xattr(inode, &no_expand);
397
398 if (ei->i_inline_off)
399 ret = ext4_update_inline_data(handle, inode, len);
400 else
401 ret = ext4_create_inline_data(handle, inode, len);
402
403 ext4_write_unlock_xattr(inode, &no_expand);
404 return ret;
405 }
406
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)407 static int ext4_destroy_inline_data_nolock(handle_t *handle,
408 struct inode *inode)
409 {
410 struct ext4_inode_info *ei = EXT4_I(inode);
411 struct ext4_xattr_ibody_find is = {
412 .s = { .not_found = 0, },
413 };
414 struct ext4_xattr_info i = {
415 .name_index = EXT4_XATTR_INDEX_SYSTEM,
416 .name = EXT4_XATTR_SYSTEM_DATA,
417 .value = NULL,
418 .value_len = 0,
419 };
420 int error;
421
422 if (!ei->i_inline_off)
423 return 0;
424
425 error = ext4_get_inode_loc(inode, &is.iloc);
426 if (error)
427 return error;
428
429 error = ext4_xattr_ibody_find(inode, &i, &is);
430 if (error)
431 goto out;
432
433 BUFFER_TRACE(is.iloc.bh, "get_write_access");
434 error = ext4_journal_get_write_access(handle, is.iloc.bh);
435 if (error)
436 goto out;
437
438 error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
439 if (error)
440 goto out;
441
442 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
443 0, EXT4_MIN_INLINE_DATA_SIZE);
444 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
445
446 if (ext4_has_feature_extents(inode->i_sb)) {
447 if (S_ISDIR(inode->i_mode) ||
448 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
449 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
450 ext4_ext_tree_init(handle, inode);
451 }
452 }
453 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
454
455 get_bh(is.iloc.bh);
456 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
457
458 EXT4_I(inode)->i_inline_off = 0;
459 EXT4_I(inode)->i_inline_size = 0;
460 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
461 out:
462 brelse(is.iloc.bh);
463 if (error == -ENODATA)
464 error = 0;
465 return error;
466 }
467
ext4_read_inline_page(struct inode * inode,struct page * page)468 static int ext4_read_inline_page(struct inode *inode, struct page *page)
469 {
470 void *kaddr;
471 int ret = 0;
472 size_t len;
473 struct ext4_iloc iloc;
474
475 BUG_ON(!PageLocked(page));
476 BUG_ON(!ext4_has_inline_data(inode));
477 BUG_ON(page->index);
478
479 if (!EXT4_I(inode)->i_inline_off) {
480 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
481 inode->i_ino);
482 goto out;
483 }
484
485 ret = ext4_get_inode_loc(inode, &iloc);
486 if (ret)
487 goto out;
488
489 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
490 kaddr = kmap_atomic(page);
491 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
492 flush_dcache_page(page);
493 kunmap_atomic(kaddr);
494 zero_user_segment(page, len, PAGE_SIZE);
495 SetPageUptodate(page);
496 brelse(iloc.bh);
497
498 out:
499 return ret;
500 }
501
ext4_readpage_inline(struct inode * inode,struct page * page)502 int ext4_readpage_inline(struct inode *inode, struct page *page)
503 {
504 int ret = 0;
505
506 down_read(&EXT4_I(inode)->xattr_sem);
507 if (!ext4_has_inline_data(inode)) {
508 up_read(&EXT4_I(inode)->xattr_sem);
509 return -EAGAIN;
510 }
511
512 if (trace_android_fs_dataread_start_enabled()) {
513 char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];
514
515 path = android_fstrace_get_pathname(pathbuf,
516 MAX_TRACE_PATHBUF_LEN,
517 inode);
518 trace_android_fs_dataread_start(inode, page_offset(page),
519 PAGE_SIZE, current->pid,
520 path, current->comm);
521 }
522
523 /*
524 * Current inline data can only exist in the 1st page,
525 * So for all the other pages, just set them uptodate.
526 */
527 if (!page->index)
528 ret = ext4_read_inline_page(inode, page);
529 else if (!PageUptodate(page)) {
530 zero_user_segment(page, 0, PAGE_SIZE);
531 SetPageUptodate(page);
532 }
533
534 trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);
535
536 up_read(&EXT4_I(inode)->xattr_sem);
537
538 unlock_page(page);
539 return ret >= 0 ? 0 : ret;
540 }
541
ext4_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags)542 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
543 struct inode *inode,
544 unsigned flags)
545 {
546 int ret, needed_blocks, no_expand;
547 handle_t *handle = NULL;
548 int retries = 0, sem_held = 0;
549 struct page *page = NULL;
550 unsigned from, to;
551 struct ext4_iloc iloc;
552
553 if (!ext4_has_inline_data(inode)) {
554 /*
555 * clear the flag so that no new write
556 * will trap here again.
557 */
558 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
559 return 0;
560 }
561
562 needed_blocks = ext4_writepage_trans_blocks(inode);
563
564 ret = ext4_get_inode_loc(inode, &iloc);
565 if (ret)
566 return ret;
567
568 retry:
569 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
570 if (IS_ERR(handle)) {
571 ret = PTR_ERR(handle);
572 handle = NULL;
573 goto out;
574 }
575
576 /* We cannot recurse into the filesystem as the transaction is already
577 * started */
578 flags |= AOP_FLAG_NOFS;
579
580 page = grab_cache_page_write_begin(mapping, 0, flags);
581 if (!page) {
582 ret = -ENOMEM;
583 goto out;
584 }
585
586 ext4_write_lock_xattr(inode, &no_expand);
587 sem_held = 1;
588 /* If some one has already done this for us, just exit. */
589 if (!ext4_has_inline_data(inode)) {
590 ret = 0;
591 goto out;
592 }
593
594 from = 0;
595 to = ext4_get_inline_size(inode);
596 if (!PageUptodate(page)) {
597 ret = ext4_read_inline_page(inode, page);
598 if (ret < 0)
599 goto out;
600 }
601
602 ret = ext4_destroy_inline_data_nolock(handle, inode);
603 if (ret)
604 goto out;
605
606 if (ext4_should_dioread_nolock(inode)) {
607 ret = __block_write_begin(page, from, to,
608 ext4_get_block_unwritten);
609 } else
610 ret = __block_write_begin(page, from, to, ext4_get_block);
611
612 if (!ret && ext4_should_journal_data(inode)) {
613 ret = ext4_walk_page_buffers(handle, page_buffers(page),
614 from, to, NULL,
615 do_journal_get_write_access);
616 }
617
618 if (ret) {
619 unlock_page(page);
620 put_page(page);
621 page = NULL;
622 ext4_orphan_add(handle, inode);
623 ext4_write_unlock_xattr(inode, &no_expand);
624 sem_held = 0;
625 ext4_journal_stop(handle);
626 handle = NULL;
627 ext4_truncate_failed_write(inode);
628 /*
629 * If truncate failed early the inode might
630 * still be on the orphan list; we need to
631 * make sure the inode is removed from the
632 * orphan list in that case.
633 */
634 if (inode->i_nlink)
635 ext4_orphan_del(NULL, inode);
636 }
637
638 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
639 goto retry;
640
641 if (page)
642 block_commit_write(page, from, to);
643 out:
644 if (page) {
645 unlock_page(page);
646 put_page(page);
647 }
648 if (sem_held)
649 ext4_write_unlock_xattr(inode, &no_expand);
650 if (handle)
651 ext4_journal_stop(handle);
652 brelse(iloc.bh);
653 return ret;
654 }
655
656 /*
657 * Try to write data in the inode.
658 * If the inode has inline data, check whether the new write can be
659 * in the inode also. If not, create the page the handle, move the data
660 * to the page make it update and let the later codes create extent for it.
661 */
ext4_try_to_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep)662 int ext4_try_to_write_inline_data(struct address_space *mapping,
663 struct inode *inode,
664 loff_t pos, unsigned len,
665 unsigned flags,
666 struct page **pagep)
667 {
668 int ret;
669 handle_t *handle;
670 struct page *page;
671 struct ext4_iloc iloc;
672
673 if (pos + len > ext4_get_max_inline_size(inode))
674 goto convert;
675
676 ret = ext4_get_inode_loc(inode, &iloc);
677 if (ret)
678 return ret;
679
680 /*
681 * The possible write could happen in the inode,
682 * so try to reserve the space in inode first.
683 */
684 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
685 if (IS_ERR(handle)) {
686 ret = PTR_ERR(handle);
687 handle = NULL;
688 goto out;
689 }
690
691 ret = ext4_prepare_inline_data(handle, inode, pos + len);
692 if (ret && ret != -ENOSPC)
693 goto out;
694
695 /* We don't have space in inline inode, so convert it to extent. */
696 if (ret == -ENOSPC) {
697 ext4_journal_stop(handle);
698 brelse(iloc.bh);
699 goto convert;
700 }
701
702 ret = ext4_journal_get_write_access(handle, iloc.bh);
703 if (ret)
704 goto out;
705
706 flags |= AOP_FLAG_NOFS;
707
708 page = grab_cache_page_write_begin(mapping, 0, flags);
709 if (!page) {
710 ret = -ENOMEM;
711 goto out;
712 }
713
714 *pagep = page;
715 down_read(&EXT4_I(inode)->xattr_sem);
716 if (!ext4_has_inline_data(inode)) {
717 ret = 0;
718 unlock_page(page);
719 put_page(page);
720 goto out_up_read;
721 }
722
723 if (!PageUptodate(page)) {
724 ret = ext4_read_inline_page(inode, page);
725 if (ret < 0) {
726 unlock_page(page);
727 put_page(page);
728 goto out_up_read;
729 }
730 }
731
732 ret = 1;
733 handle = NULL;
734 out_up_read:
735 up_read(&EXT4_I(inode)->xattr_sem);
736 out:
737 if (handle && (ret != 1))
738 ext4_journal_stop(handle);
739 brelse(iloc.bh);
740 return ret;
741 convert:
742 return ext4_convert_inline_data_to_extent(mapping,
743 inode, flags);
744 }
745
ext4_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)746 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
747 unsigned copied, struct page *page)
748 {
749 int ret, no_expand;
750 void *kaddr;
751 struct ext4_iloc iloc;
752
753 if (unlikely(copied < len) && !PageUptodate(page))
754 return 0;
755
756 ret = ext4_get_inode_loc(inode, &iloc);
757 if (ret) {
758 ext4_std_error(inode->i_sb, ret);
759 return ret;
760 }
761
762 ext4_write_lock_xattr(inode, &no_expand);
763 BUG_ON(!ext4_has_inline_data(inode));
764
765 /*
766 * ei->i_inline_off may have changed since ext4_write_begin()
767 * called ext4_try_to_write_inline_data()
768 */
769 (void) ext4_find_inline_data_nolock(inode);
770
771 kaddr = kmap_atomic(page);
772 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
773 kunmap_atomic(kaddr);
774 SetPageUptodate(page);
775 /* clear page dirty so that writepages wouldn't work for us. */
776 ClearPageDirty(page);
777
778 ext4_write_unlock_xattr(inode, &no_expand);
779 brelse(iloc.bh);
780 mark_inode_dirty(inode);
781
782 return copied;
783 }
784
785 struct buffer_head *
ext4_journalled_write_inline_data(struct inode * inode,unsigned len,struct page * page)786 ext4_journalled_write_inline_data(struct inode *inode,
787 unsigned len,
788 struct page *page)
789 {
790 int ret, no_expand;
791 void *kaddr;
792 struct ext4_iloc iloc;
793
794 ret = ext4_get_inode_loc(inode, &iloc);
795 if (ret) {
796 ext4_std_error(inode->i_sb, ret);
797 return NULL;
798 }
799
800 ext4_write_lock_xattr(inode, &no_expand);
801 kaddr = kmap_atomic(page);
802 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
803 kunmap_atomic(kaddr);
804 ext4_write_unlock_xattr(inode, &no_expand);
805
806 return iloc.bh;
807 }
808
809 /*
810 * Try to make the page cache and handle ready for the inline data case.
811 * We can call this function in 2 cases:
812 * 1. The inode is created and the first write exceeds inline size. We can
813 * clear the inode state safely.
814 * 2. The inode has inline data, then we need to read the data, make it
815 * update and dirty so that ext4_da_writepages can handle it. We don't
816 * need to start the journal since the file's metatdata isn't changed now.
817 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags,void ** fsdata)818 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
819 struct inode *inode,
820 unsigned flags,
821 void **fsdata)
822 {
823 int ret = 0, inline_size;
824 struct page *page;
825
826 page = grab_cache_page_write_begin(mapping, 0, flags);
827 if (!page)
828 return -ENOMEM;
829
830 down_read(&EXT4_I(inode)->xattr_sem);
831 if (!ext4_has_inline_data(inode)) {
832 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
833 goto out;
834 }
835
836 inline_size = ext4_get_inline_size(inode);
837
838 if (!PageUptodate(page)) {
839 ret = ext4_read_inline_page(inode, page);
840 if (ret < 0)
841 goto out;
842 }
843
844 ret = __block_write_begin(page, 0, inline_size,
845 ext4_da_get_block_prep);
846 if (ret) {
847 up_read(&EXT4_I(inode)->xattr_sem);
848 unlock_page(page);
849 put_page(page);
850 ext4_truncate_failed_write(inode);
851 return ret;
852 }
853
854 SetPageDirty(page);
855 SetPageUptodate(page);
856 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
857 *fsdata = (void *)CONVERT_INLINE_DATA;
858
859 out:
860 up_read(&EXT4_I(inode)->xattr_sem);
861 if (page) {
862 unlock_page(page);
863 put_page(page);
864 }
865 return ret;
866 }
867
868 /*
869 * Prepare the write for the inline data.
870 * If the data can be written into the inode, we just read
871 * the page and make it uptodate, and start the journal.
872 * Otherwise read the page, makes it dirty so that it can be
873 * handle in writepages(the i_disksize update is left to the
874 * normal ext4_da_write_end).
875 */
ext4_da_write_inline_data_begin(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep,void ** fsdata)876 int ext4_da_write_inline_data_begin(struct address_space *mapping,
877 struct inode *inode,
878 loff_t pos, unsigned len,
879 unsigned flags,
880 struct page **pagep,
881 void **fsdata)
882 {
883 int ret, inline_size;
884 handle_t *handle;
885 struct page *page;
886 struct ext4_iloc iloc;
887 int retries = 0;
888
889 ret = ext4_get_inode_loc(inode, &iloc);
890 if (ret)
891 return ret;
892
893 retry_journal:
894 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
895 if (IS_ERR(handle)) {
896 ret = PTR_ERR(handle);
897 goto out;
898 }
899
900 inline_size = ext4_get_max_inline_size(inode);
901
902 ret = -ENOSPC;
903 if (inline_size >= pos + len) {
904 ret = ext4_prepare_inline_data(handle, inode, pos + len);
905 if (ret && ret != -ENOSPC)
906 goto out_journal;
907 }
908
909 /*
910 * We cannot recurse into the filesystem as the transaction
911 * is already started.
912 */
913 flags |= AOP_FLAG_NOFS;
914
915 if (ret == -ENOSPC) {
916 ext4_journal_stop(handle);
917 ret = ext4_da_convert_inline_data_to_extent(mapping,
918 inode,
919 flags,
920 fsdata);
921 if (ret == -ENOSPC &&
922 ext4_should_retry_alloc(inode->i_sb, &retries))
923 goto retry_journal;
924 goto out;
925 }
926
927 page = grab_cache_page_write_begin(mapping, 0, flags);
928 if (!page) {
929 ret = -ENOMEM;
930 goto out_journal;
931 }
932
933 down_read(&EXT4_I(inode)->xattr_sem);
934 if (!ext4_has_inline_data(inode)) {
935 ret = 0;
936 goto out_release_page;
937 }
938
939 if (!PageUptodate(page)) {
940 ret = ext4_read_inline_page(inode, page);
941 if (ret < 0)
942 goto out_release_page;
943 }
944 ret = ext4_journal_get_write_access(handle, iloc.bh);
945 if (ret)
946 goto out_release_page;
947
948 up_read(&EXT4_I(inode)->xattr_sem);
949 *pagep = page;
950 brelse(iloc.bh);
951 return 1;
952 out_release_page:
953 up_read(&EXT4_I(inode)->xattr_sem);
954 unlock_page(page);
955 put_page(page);
956 out_journal:
957 ext4_journal_stop(handle);
958 out:
959 brelse(iloc.bh);
960 return ret;
961 }
962
ext4_da_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)963 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
964 unsigned len, unsigned copied,
965 struct page *page)
966 {
967 int ret;
968
969 ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
970 if (ret < 0) {
971 unlock_page(page);
972 put_page(page);
973 return ret;
974 }
975 copied = ret;
976
977 /*
978 * No need to use i_size_read() here, the i_size
979 * cannot change under us because we hold i_mutex.
980 *
981 * But it's important to update i_size while still holding page lock:
982 * page writeout could otherwise come in and zero beyond i_size.
983 */
984 if (pos+copied > inode->i_size)
985 i_size_write(inode, pos+copied);
986 unlock_page(page);
987 put_page(page);
988
989 /*
990 * Don't mark the inode dirty under page lock. First, it unnecessarily
991 * makes the holding time of page lock longer. Second, it forces lock
992 * ordering of page lock and transaction start for journaling
993 * filesystems.
994 */
995 mark_inode_dirty(inode);
996
997 return copied;
998 }
999
1000 #ifdef INLINE_DIR_DEBUG
ext4_show_inline_dir(struct inode * dir,struct buffer_head * bh,void * inline_start,int inline_size)1001 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
1002 void *inline_start, int inline_size)
1003 {
1004 int offset;
1005 unsigned short de_len;
1006 struct ext4_dir_entry_2 *de = inline_start;
1007 void *dlimit = inline_start + inline_size;
1008
1009 trace_printk("inode %lu\n", dir->i_ino);
1010 offset = 0;
1011 while ((void *)de < dlimit) {
1012 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1013 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1014 offset, de_len, de->name_len, de->name,
1015 de->name_len, le32_to_cpu(de->inode));
1016 if (ext4_check_dir_entry(dir, NULL, de, bh,
1017 inline_start, inline_size, 0, offset))
1018 BUG();
1019
1020 offset += de_len;
1021 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1022 }
1023 }
1024 #else
1025 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1026 #endif
1027
1028 /*
1029 * Add a new entry into a inline dir.
1030 * It will return -ENOSPC if no space is available, and -EIO
1031 * and -EEXIST if directory entry already exists.
1032 */
ext4_add_dirent_to_inline(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode,struct ext4_iloc * iloc,void * inline_start,int inline_size)1033 static int ext4_add_dirent_to_inline(handle_t *handle,
1034 struct ext4_filename *fname,
1035 struct inode *dir,
1036 struct inode *inode,
1037 struct ext4_iloc *iloc,
1038 void *inline_start, int inline_size)
1039 {
1040 int err;
1041 struct ext4_dir_entry_2 *de;
1042
1043 err = ext4_find_dest_de(dir, inode, 0, iloc->bh, inline_start,
1044 inline_size, fname, &de);
1045 if (err)
1046 return err;
1047
1048 BUFFER_TRACE(iloc->bh, "get_write_access");
1049 err = ext4_journal_get_write_access(handle, iloc->bh);
1050 if (err)
1051 return err;
1052 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1053
1054 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1055
1056 /*
1057 * XXX shouldn't update any times until successful
1058 * completion of syscall, but too many callers depend
1059 * on this.
1060 *
1061 * XXX similarly, too many callers depend on
1062 * ext4_new_inode() setting the times, but error
1063 * recovery deletes the inode, so the worst that can
1064 * happen is that the times are slightly out of date
1065 * and/or different from the directory change time.
1066 */
1067 dir->i_mtime = dir->i_ctime = current_time(dir);
1068 ext4_update_dx_flag(dir);
1069 inode_inc_iversion(dir);
1070 return 1;
1071 }
1072
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)1073 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1074 struct ext4_iloc *iloc)
1075 {
1076 struct ext4_xattr_entry *entry;
1077 struct ext4_xattr_ibody_header *header;
1078
1079 BUG_ON(!EXT4_I(inode)->i_inline_off);
1080
1081 header = IHDR(inode, ext4_raw_inode(iloc));
1082 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1083 EXT4_I(inode)->i_inline_off);
1084
1085 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1086 }
1087
1088 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)1089 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1090 {
1091 struct ext4_dir_entry_2 *de, *prev_de;
1092 void *limit;
1093 int de_len;
1094
1095 de = (struct ext4_dir_entry_2 *)de_buf;
1096 if (old_size) {
1097 limit = de_buf + old_size;
1098 do {
1099 prev_de = de;
1100 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1101 de_buf += de_len;
1102 de = (struct ext4_dir_entry_2 *)de_buf;
1103 } while (de_buf < limit);
1104
1105 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1106 old_size, new_size);
1107 } else {
1108 /* this is just created, so create an empty entry. */
1109 de->inode = 0;
1110 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1111 }
1112 }
1113
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1114 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1115 struct ext4_iloc *iloc)
1116 {
1117 int ret;
1118 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1119 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1120
1121 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1122 return -ENOSPC;
1123
1124 ret = ext4_update_inline_data(handle, dir,
1125 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1126 if (ret)
1127 return ret;
1128
1129 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1130 EXT4_I(dir)->i_inline_size -
1131 EXT4_MIN_INLINE_DATA_SIZE);
1132 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1133 return 0;
1134 }
1135
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1136 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1137 struct ext4_iloc *iloc,
1138 void *buf, int inline_size)
1139 {
1140 int ret;
1141
1142 ret = ext4_create_inline_data(handle, inode, inline_size);
1143 if (ret) {
1144 ext4_msg(inode->i_sb, KERN_EMERG,
1145 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1146 inode->i_ino, ret);
1147 return;
1148 }
1149 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1150 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1151 }
1152
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1153 static int ext4_finish_convert_inline_dir(handle_t *handle,
1154 struct inode *inode,
1155 struct buffer_head *dir_block,
1156 void *buf,
1157 int inline_size)
1158 {
1159 int err, csum_size = 0, header_size = 0;
1160 struct ext4_dir_entry_2 *de;
1161 void *target = dir_block->b_data;
1162
1163 /*
1164 * First create "." and ".." and then copy the dir information
1165 * back to the block.
1166 */
1167 de = (struct ext4_dir_entry_2 *)target;
1168 de = ext4_init_dot_dotdot(inode, de,
1169 inode->i_sb->s_blocksize, csum_size,
1170 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1171 header_size = (void *)de - target;
1172
1173 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1174 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1175
1176 if (ext4_has_metadata_csum(inode->i_sb))
1177 csum_size = sizeof(struct ext4_dir_entry_tail);
1178
1179 inode->i_size = inode->i_sb->s_blocksize;
1180 i_size_write(inode, inode->i_sb->s_blocksize);
1181 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1182 ext4_update_final_de(dir_block->b_data,
1183 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1184 inode->i_sb->s_blocksize - csum_size);
1185
1186 if (csum_size)
1187 ext4_initialize_dirent_tail(dir_block,
1188 inode->i_sb->s_blocksize);
1189 set_buffer_uptodate(dir_block);
1190 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1191 if (err)
1192 return err;
1193 set_buffer_verified(dir_block);
1194 return ext4_mark_inode_dirty(handle, inode);
1195 }
1196
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1197 static int ext4_convert_inline_data_nolock(handle_t *handle,
1198 struct inode *inode,
1199 struct ext4_iloc *iloc)
1200 {
1201 int error;
1202 void *buf = NULL;
1203 struct buffer_head *data_bh = NULL;
1204 struct ext4_map_blocks map;
1205 int inline_size;
1206
1207 inline_size = ext4_get_inline_size(inode);
1208 buf = kmalloc(inline_size, GFP_NOFS);
1209 if (!buf) {
1210 error = -ENOMEM;
1211 goto out;
1212 }
1213
1214 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1215 if (error < 0)
1216 goto out;
1217
1218 /*
1219 * Make sure the inline directory entries pass checks before we try to
1220 * convert them, so that we avoid touching stuff that needs fsck.
1221 */
1222 if (S_ISDIR(inode->i_mode)) {
1223 error = ext4_check_all_de(inode, iloc->bh,
1224 buf + EXT4_INLINE_DOTDOT_SIZE,
1225 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1226 if (error)
1227 goto out;
1228 }
1229
1230 error = ext4_destroy_inline_data_nolock(handle, inode);
1231 if (error)
1232 goto out;
1233
1234 map.m_lblk = 0;
1235 map.m_len = 1;
1236 map.m_flags = 0;
1237 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1238 if (error < 0)
1239 goto out_restore;
1240 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1241 error = -EIO;
1242 goto out_restore;
1243 }
1244
1245 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1246 if (!data_bh) {
1247 error = -ENOMEM;
1248 goto out_restore;
1249 }
1250
1251 lock_buffer(data_bh);
1252 error = ext4_journal_get_create_access(handle, data_bh);
1253 if (error) {
1254 unlock_buffer(data_bh);
1255 error = -EIO;
1256 goto out_restore;
1257 }
1258 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1259
1260 if (!S_ISDIR(inode->i_mode)) {
1261 memcpy(data_bh->b_data, buf, inline_size);
1262 set_buffer_uptodate(data_bh);
1263 error = ext4_handle_dirty_metadata(handle,
1264 inode, data_bh);
1265 } else {
1266 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1267 buf, inline_size);
1268 }
1269
1270 unlock_buffer(data_bh);
1271 out_restore:
1272 if (error)
1273 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1274
1275 out:
1276 brelse(data_bh);
1277 kfree(buf);
1278 return error;
1279 }
1280
1281 /*
1282 * Try to add the new entry to the inline data.
1283 * If succeeds, return 0. If not, extended the inline dir and copied data to
1284 * the new created block.
1285 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1286 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1287 struct inode *dir, struct inode *inode)
1288 {
1289 int ret, ret2, inline_size, no_expand;
1290 void *inline_start;
1291 struct ext4_iloc iloc;
1292
1293 ret = ext4_get_inode_loc(dir, &iloc);
1294 if (ret)
1295 return ret;
1296
1297 ext4_write_lock_xattr(dir, &no_expand);
1298 if (!ext4_has_inline_data(dir))
1299 goto out;
1300
1301 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1302 EXT4_INLINE_DOTDOT_SIZE;
1303 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1304
1305 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1306 inline_start, inline_size);
1307 if (ret != -ENOSPC)
1308 goto out;
1309
1310 /* check whether it can be inserted to inline xattr space. */
1311 inline_size = EXT4_I(dir)->i_inline_size -
1312 EXT4_MIN_INLINE_DATA_SIZE;
1313 if (!inline_size) {
1314 /* Try to use the xattr space.*/
1315 ret = ext4_update_inline_dir(handle, dir, &iloc);
1316 if (ret && ret != -ENOSPC)
1317 goto out;
1318
1319 inline_size = EXT4_I(dir)->i_inline_size -
1320 EXT4_MIN_INLINE_DATA_SIZE;
1321 }
1322
1323 if (inline_size) {
1324 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1325
1326 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1327 inode, &iloc, inline_start,
1328 inline_size);
1329
1330 if (ret != -ENOSPC)
1331 goto out;
1332 }
1333
1334 /*
1335 * The inline space is filled up, so create a new block for it.
1336 * As the extent tree will be created, we have to save the inline
1337 * dir first.
1338 */
1339 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1340
1341 out:
1342 ext4_write_unlock_xattr(dir, &no_expand);
1343 ret2 = ext4_mark_inode_dirty(handle, dir);
1344 if (unlikely(ret2 && !ret))
1345 ret = ret2;
1346 brelse(iloc.bh);
1347 return ret;
1348 }
1349
1350 /*
1351 * This function fills a red-black tree with information from an
1352 * inlined dir. It returns the number directory entries loaded
1353 * into the tree. If there is an error it is returned in err.
1354 */
ext4_inlinedir_to_tree(struct file * dir_file,struct inode * dir,ext4_lblk_t block,struct dx_hash_info * hinfo,__u32 start_hash,__u32 start_minor_hash,int * has_inline_data)1355 int ext4_inlinedir_to_tree(struct file *dir_file,
1356 struct inode *dir, ext4_lblk_t block,
1357 struct dx_hash_info *hinfo,
1358 __u32 start_hash, __u32 start_minor_hash,
1359 int *has_inline_data)
1360 {
1361 int err = 0, count = 0;
1362 unsigned int parent_ino;
1363 int pos;
1364 struct ext4_dir_entry_2 *de;
1365 struct inode *inode = file_inode(dir_file);
1366 int ret, inline_size = 0;
1367 struct ext4_iloc iloc;
1368 void *dir_buf = NULL;
1369 struct ext4_dir_entry_2 fake;
1370 struct fscrypt_str tmp_str;
1371
1372 ret = ext4_get_inode_loc(inode, &iloc);
1373 if (ret)
1374 return ret;
1375
1376 down_read(&EXT4_I(inode)->xattr_sem);
1377 if (!ext4_has_inline_data(inode)) {
1378 up_read(&EXT4_I(inode)->xattr_sem);
1379 *has_inline_data = 0;
1380 goto out;
1381 }
1382
1383 inline_size = ext4_get_inline_size(inode);
1384 dir_buf = kmalloc(inline_size, GFP_NOFS);
1385 if (!dir_buf) {
1386 ret = -ENOMEM;
1387 up_read(&EXT4_I(inode)->xattr_sem);
1388 goto out;
1389 }
1390
1391 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1392 up_read(&EXT4_I(inode)->xattr_sem);
1393 if (ret < 0)
1394 goto out;
1395
1396 pos = 0;
1397 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1398 while (pos < inline_size) {
1399 /*
1400 * As inlined dir doesn't store any information about '.' and
1401 * only the inode number of '..' is stored, we have to handle
1402 * them differently.
1403 */
1404 if (pos == 0) {
1405 fake.inode = cpu_to_le32(inode->i_ino);
1406 fake.name_len = 1;
1407 strcpy(fake.name, ".");
1408 fake.rec_len = ext4_rec_len_to_disk(
1409 ext4_dir_rec_len(fake.name_len, NULL),
1410 inline_size);
1411 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1412 de = &fake;
1413 pos = EXT4_INLINE_DOTDOT_OFFSET;
1414 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1415 fake.inode = cpu_to_le32(parent_ino);
1416 fake.name_len = 2;
1417 strcpy(fake.name, "..");
1418 fake.rec_len = ext4_rec_len_to_disk(
1419 ext4_dir_rec_len(fake.name_len, NULL),
1420 inline_size);
1421 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1422 de = &fake;
1423 pos = EXT4_INLINE_DOTDOT_SIZE;
1424 } else {
1425 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1426 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1427 if (ext4_check_dir_entry(inode, dir_file, de,
1428 iloc.bh, dir_buf,
1429 inline_size, block, pos)) {
1430 ret = count;
1431 goto out;
1432 }
1433 }
1434
1435 if (ext4_hash_in_dirent(dir)) {
1436 hinfo->hash = EXT4_DIRENT_HASH(de);
1437 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1438 } else {
1439 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1440 }
1441 if ((hinfo->hash < start_hash) ||
1442 ((hinfo->hash == start_hash) &&
1443 (hinfo->minor_hash < start_minor_hash)))
1444 continue;
1445 if (de->inode == 0)
1446 continue;
1447 tmp_str.name = de->name;
1448 tmp_str.len = de->name_len;
1449 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1450 hinfo->minor_hash, de, &tmp_str);
1451 if (err) {
1452 ret = err;
1453 goto out;
1454 }
1455 count++;
1456 }
1457 ret = count;
1458 out:
1459 kfree(dir_buf);
1460 brelse(iloc.bh);
1461 return ret;
1462 }
1463
1464 /*
1465 * So this function is called when the volume is mkfsed with
1466 * dir_index disabled. In order to keep f_pos persistent
1467 * after we convert from an inlined dir to a blocked based,
1468 * we just pretend that we are a normal dir and return the
1469 * offset as if '.' and '..' really take place.
1470 *
1471 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1472 int ext4_read_inline_dir(struct file *file,
1473 struct dir_context *ctx,
1474 int *has_inline_data)
1475 {
1476 unsigned int offset, parent_ino;
1477 int i;
1478 struct ext4_dir_entry_2 *de;
1479 struct super_block *sb;
1480 struct inode *inode = file_inode(file);
1481 int ret, inline_size = 0;
1482 struct ext4_iloc iloc;
1483 void *dir_buf = NULL;
1484 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1485
1486 ret = ext4_get_inode_loc(inode, &iloc);
1487 if (ret)
1488 return ret;
1489
1490 down_read(&EXT4_I(inode)->xattr_sem);
1491 if (!ext4_has_inline_data(inode)) {
1492 up_read(&EXT4_I(inode)->xattr_sem);
1493 *has_inline_data = 0;
1494 goto out;
1495 }
1496
1497 inline_size = ext4_get_inline_size(inode);
1498 dir_buf = kmalloc(inline_size, GFP_NOFS);
1499 if (!dir_buf) {
1500 ret = -ENOMEM;
1501 up_read(&EXT4_I(inode)->xattr_sem);
1502 goto out;
1503 }
1504
1505 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1506 up_read(&EXT4_I(inode)->xattr_sem);
1507 if (ret < 0)
1508 goto out;
1509
1510 ret = 0;
1511 sb = inode->i_sb;
1512 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1513 offset = ctx->pos;
1514
1515 /*
1516 * dotdot_offset and dotdot_size is the real offset and
1517 * size for ".." and "." if the dir is block based while
1518 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1519 * So we will use extra_offset and extra_size to indicate them
1520 * during the inline dir iteration.
1521 */
1522 dotdot_offset = ext4_dir_rec_len(1, NULL);
1523 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1524 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1525 extra_size = extra_offset + inline_size;
1526
1527 /*
1528 * If the version has changed since the last call to
1529 * readdir(2), then we might be pointing to an invalid
1530 * dirent right now. Scan from the start of the inline
1531 * dir to make sure.
1532 */
1533 if (!inode_eq_iversion(inode, file->f_version)) {
1534 for (i = 0; i < extra_size && i < offset;) {
1535 /*
1536 * "." is with offset 0 and
1537 * ".." is dotdot_offset.
1538 */
1539 if (!i) {
1540 i = dotdot_offset;
1541 continue;
1542 } else if (i == dotdot_offset) {
1543 i = dotdot_size;
1544 continue;
1545 }
1546 /* for other entry, the real offset in
1547 * the buf has to be tuned accordingly.
1548 */
1549 de = (struct ext4_dir_entry_2 *)
1550 (dir_buf + i - extra_offset);
1551 /* It's too expensive to do a full
1552 * dirent test each time round this
1553 * loop, but we do have to test at
1554 * least that it is non-zero. A
1555 * failure will be detected in the
1556 * dirent test below. */
1557 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1558 < ext4_dir_rec_len(1, NULL))
1559 break;
1560 i += ext4_rec_len_from_disk(de->rec_len,
1561 extra_size);
1562 }
1563 offset = i;
1564 ctx->pos = offset;
1565 file->f_version = inode_query_iversion(inode);
1566 }
1567
1568 while (ctx->pos < extra_size) {
1569 if (ctx->pos == 0) {
1570 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1571 goto out;
1572 ctx->pos = dotdot_offset;
1573 continue;
1574 }
1575
1576 if (ctx->pos == dotdot_offset) {
1577 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1578 goto out;
1579 ctx->pos = dotdot_size;
1580 continue;
1581 }
1582
1583 de = (struct ext4_dir_entry_2 *)
1584 (dir_buf + ctx->pos - extra_offset);
1585 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1586 extra_size, 0, ctx->pos))
1587 goto out;
1588 if (le32_to_cpu(de->inode)) {
1589 if (!dir_emit(ctx, de->name, de->name_len,
1590 le32_to_cpu(de->inode),
1591 get_dtype(sb, de->file_type)))
1592 goto out;
1593 }
1594 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1595 }
1596 out:
1597 kfree(dir_buf);
1598 brelse(iloc.bh);
1599 return ret;
1600 }
1601
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1602 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1603 struct ext4_dir_entry_2 **parent_de,
1604 int *retval)
1605 {
1606 struct ext4_iloc iloc;
1607
1608 *retval = ext4_get_inode_loc(inode, &iloc);
1609 if (*retval)
1610 return NULL;
1611
1612 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1613
1614 return iloc.bh;
1615 }
1616
1617 /*
1618 * Try to create the inline data for the new dir.
1619 * If it succeeds, return 0, otherwise return the error.
1620 * In case of ENOSPC, the caller should create the normal disk layout dir.
1621 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1622 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1623 struct inode *inode)
1624 {
1625 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1626 struct ext4_iloc iloc;
1627 struct ext4_dir_entry_2 *de;
1628
1629 ret = ext4_get_inode_loc(inode, &iloc);
1630 if (ret)
1631 return ret;
1632
1633 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1634 if (ret)
1635 goto out;
1636
1637 /*
1638 * For inline dir, we only save the inode information for the ".."
1639 * and create a fake dentry to cover the left space.
1640 */
1641 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1642 de->inode = cpu_to_le32(parent->i_ino);
1643 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1644 de->inode = 0;
1645 de->rec_len = ext4_rec_len_to_disk(
1646 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1647 inline_size);
1648 set_nlink(inode, 2);
1649 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1650 out:
1651 brelse(iloc.bh);
1652 return ret;
1653 }
1654
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1655 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1656 struct ext4_filename *fname,
1657 struct ext4_dir_entry_2 **res_dir,
1658 int *has_inline_data)
1659 {
1660 int ret;
1661 struct ext4_iloc iloc;
1662 void *inline_start;
1663 int inline_size;
1664
1665 if (ext4_get_inode_loc(dir, &iloc))
1666 return NULL;
1667
1668 down_read(&EXT4_I(dir)->xattr_sem);
1669 if (!ext4_has_inline_data(dir)) {
1670 *has_inline_data = 0;
1671 goto out;
1672 }
1673
1674 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1675 EXT4_INLINE_DOTDOT_SIZE;
1676 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1677 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1678 dir, fname, 0, 0, res_dir);
1679 if (ret == 1)
1680 goto out_find;
1681 if (ret < 0)
1682 goto out;
1683
1684 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1685 goto out;
1686
1687 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1688 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1689
1690 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1691 dir, fname, 0, 0, res_dir);
1692 if (ret == 1)
1693 goto out_find;
1694
1695 out:
1696 brelse(iloc.bh);
1697 iloc.bh = NULL;
1698 out_find:
1699 up_read(&EXT4_I(dir)->xattr_sem);
1700 return iloc.bh;
1701 }
1702
ext4_delete_inline_entry(handle_t * handle,struct inode * dir,struct ext4_dir_entry_2 * de_del,struct buffer_head * bh,int * has_inline_data)1703 int ext4_delete_inline_entry(handle_t *handle,
1704 struct inode *dir,
1705 struct ext4_dir_entry_2 *de_del,
1706 struct buffer_head *bh,
1707 int *has_inline_data)
1708 {
1709 int err, inline_size, no_expand;
1710 struct ext4_iloc iloc;
1711 void *inline_start;
1712
1713 err = ext4_get_inode_loc(dir, &iloc);
1714 if (err)
1715 return err;
1716
1717 ext4_write_lock_xattr(dir, &no_expand);
1718 if (!ext4_has_inline_data(dir)) {
1719 *has_inline_data = 0;
1720 goto out;
1721 }
1722
1723 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1724 EXT4_MIN_INLINE_DATA_SIZE) {
1725 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1726 EXT4_INLINE_DOTDOT_SIZE;
1727 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1728 EXT4_INLINE_DOTDOT_SIZE;
1729 } else {
1730 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1731 inline_size = ext4_get_inline_size(dir) -
1732 EXT4_MIN_INLINE_DATA_SIZE;
1733 }
1734
1735 BUFFER_TRACE(bh, "get_write_access");
1736 err = ext4_journal_get_write_access(handle, bh);
1737 if (err)
1738 goto out;
1739
1740 err = ext4_generic_delete_entry(dir, de_del, 0, bh,
1741 inline_start, inline_size, 0);
1742 if (err)
1743 goto out;
1744
1745 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1746 out:
1747 ext4_write_unlock_xattr(dir, &no_expand);
1748 if (likely(err == 0))
1749 err = ext4_mark_inode_dirty(handle, dir);
1750 brelse(iloc.bh);
1751 if (err != -ENOENT)
1752 ext4_std_error(dir->i_sb, err);
1753 return err;
1754 }
1755
1756 /*
1757 * Get the inline dentry at offset.
1758 */
1759 static inline struct ext4_dir_entry_2 *
ext4_get_inline_entry(struct inode * inode,struct ext4_iloc * iloc,unsigned int offset,void ** inline_start,int * inline_size)1760 ext4_get_inline_entry(struct inode *inode,
1761 struct ext4_iloc *iloc,
1762 unsigned int offset,
1763 void **inline_start,
1764 int *inline_size)
1765 {
1766 void *inline_pos;
1767
1768 BUG_ON(offset > ext4_get_inline_size(inode));
1769
1770 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1771 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1772 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1773 } else {
1774 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1775 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1776 *inline_size = ext4_get_inline_size(inode) -
1777 EXT4_MIN_INLINE_DATA_SIZE;
1778 }
1779
1780 if (inline_start)
1781 *inline_start = inline_pos;
1782 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1783 }
1784
empty_inline_dir(struct inode * dir,int * has_inline_data)1785 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1786 {
1787 int err, inline_size;
1788 struct ext4_iloc iloc;
1789 size_t inline_len;
1790 void *inline_pos;
1791 unsigned int offset;
1792 struct ext4_dir_entry_2 *de;
1793 bool ret = false;
1794
1795 err = ext4_get_inode_loc(dir, &iloc);
1796 if (err) {
1797 EXT4_ERROR_INODE_ERR(dir, -err,
1798 "error %d getting inode %lu block",
1799 err, dir->i_ino);
1800 return false;
1801 }
1802
1803 down_read(&EXT4_I(dir)->xattr_sem);
1804 if (!ext4_has_inline_data(dir)) {
1805 *has_inline_data = 0;
1806 ret = true;
1807 goto out;
1808 }
1809
1810 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1811 if (!le32_to_cpu(de->inode)) {
1812 ext4_warning(dir->i_sb,
1813 "bad inline directory (dir #%lu) - no `..'",
1814 dir->i_ino);
1815 goto out;
1816 }
1817
1818 inline_len = ext4_get_inline_size(dir);
1819 offset = EXT4_INLINE_DOTDOT_SIZE;
1820 while (offset < inline_len) {
1821 de = ext4_get_inline_entry(dir, &iloc, offset,
1822 &inline_pos, &inline_size);
1823 if (ext4_check_dir_entry(dir, NULL, de,
1824 iloc.bh, inline_pos,
1825 inline_size, 0, offset)) {
1826 ext4_warning(dir->i_sb,
1827 "bad inline directory (dir #%lu) - "
1828 "inode %u, rec_len %u, name_len %d"
1829 "inline size %d",
1830 dir->i_ino, le32_to_cpu(de->inode),
1831 le16_to_cpu(de->rec_len), de->name_len,
1832 inline_size);
1833 goto out;
1834 }
1835 if (le32_to_cpu(de->inode)) {
1836 goto out;
1837 }
1838 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1839 }
1840
1841 ret = true;
1842 out:
1843 up_read(&EXT4_I(dir)->xattr_sem);
1844 brelse(iloc.bh);
1845 return ret;
1846 }
1847
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1848 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1849 {
1850 int ret, no_expand;
1851
1852 ext4_write_lock_xattr(inode, &no_expand);
1853 ret = ext4_destroy_inline_data_nolock(handle, inode);
1854 ext4_write_unlock_xattr(inode, &no_expand);
1855
1856 return ret;
1857 }
1858
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1859 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1860 {
1861 __u64 addr;
1862 int error = -EAGAIN;
1863 struct ext4_iloc iloc;
1864
1865 down_read(&EXT4_I(inode)->xattr_sem);
1866 if (!ext4_has_inline_data(inode))
1867 goto out;
1868
1869 error = ext4_get_inode_loc(inode, &iloc);
1870 if (error)
1871 goto out;
1872
1873 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1874 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1875 addr += offsetof(struct ext4_inode, i_block);
1876
1877 brelse(iloc.bh);
1878
1879 iomap->addr = addr;
1880 iomap->offset = 0;
1881 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1882 i_size_read(inode));
1883 iomap->type = IOMAP_INLINE;
1884 iomap->flags = 0;
1885
1886 out:
1887 up_read(&EXT4_I(inode)->xattr_sem);
1888 return error;
1889 }
1890
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1891 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1892 {
1893 handle_t *handle;
1894 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1895 size_t i_size;
1896 void *value = NULL;
1897 struct ext4_xattr_ibody_find is = {
1898 .s = { .not_found = -ENODATA, },
1899 };
1900 struct ext4_xattr_info i = {
1901 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1902 .name = EXT4_XATTR_SYSTEM_DATA,
1903 };
1904
1905
1906 needed_blocks = ext4_writepage_trans_blocks(inode);
1907 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1908 if (IS_ERR(handle))
1909 return PTR_ERR(handle);
1910
1911 ext4_write_lock_xattr(inode, &no_expand);
1912 if (!ext4_has_inline_data(inode)) {
1913 ext4_write_unlock_xattr(inode, &no_expand);
1914 *has_inline = 0;
1915 ext4_journal_stop(handle);
1916 return 0;
1917 }
1918
1919 if ((err = ext4_orphan_add(handle, inode)) != 0)
1920 goto out;
1921
1922 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1923 goto out;
1924
1925 down_write(&EXT4_I(inode)->i_data_sem);
1926 i_size = inode->i_size;
1927 inline_size = ext4_get_inline_size(inode);
1928 EXT4_I(inode)->i_disksize = i_size;
1929
1930 if (i_size < inline_size) {
1931 /* Clear the content in the xattr space. */
1932 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1933 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1934 goto out_error;
1935
1936 BUG_ON(is.s.not_found);
1937
1938 value_len = le32_to_cpu(is.s.here->e_value_size);
1939 value = kmalloc(value_len, GFP_NOFS);
1940 if (!value) {
1941 err = -ENOMEM;
1942 goto out_error;
1943 }
1944
1945 err = ext4_xattr_ibody_get(inode, i.name_index,
1946 i.name, value, value_len);
1947 if (err <= 0)
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 err = ext4_xattr_ibody_inline_set(handle, inode,
1954 &i, &is);
1955 if (err)
1956 goto out_error;
1957 }
1958
1959 /* Clear the content within i_blocks. */
1960 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1961 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1962 memset(p + i_size, 0,
1963 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1964 }
1965
1966 EXT4_I(inode)->i_inline_size = i_size <
1967 EXT4_MIN_INLINE_DATA_SIZE ?
1968 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1969 }
1970
1971 out_error:
1972 up_write(&EXT4_I(inode)->i_data_sem);
1973 out:
1974 brelse(is.iloc.bh);
1975 ext4_write_unlock_xattr(inode, &no_expand);
1976 kfree(value);
1977 if (inode->i_nlink)
1978 ext4_orphan_del(handle, inode);
1979
1980 if (err == 0) {
1981 inode->i_mtime = inode->i_ctime = current_time(inode);
1982 err = ext4_mark_inode_dirty(handle, inode);
1983 if (IS_SYNC(inode))
1984 ext4_handle_sync(handle);
1985 }
1986 ext4_journal_stop(handle);
1987 return err;
1988 }
1989
ext4_convert_inline_data(struct inode * inode)1990 int ext4_convert_inline_data(struct inode *inode)
1991 {
1992 int error, needed_blocks, no_expand;
1993 handle_t *handle;
1994 struct ext4_iloc iloc;
1995
1996 if (!ext4_has_inline_data(inode)) {
1997 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1998 return 0;
1999 } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2000 /*
2001 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2002 * cleared. This means we are in the middle of moving of
2003 * inline data to delay allocated block. Just force writeout
2004 * here to finish conversion.
2005 */
2006 error = filemap_flush(inode->i_mapping);
2007 if (error)
2008 return error;
2009 if (!ext4_has_inline_data(inode))
2010 return 0;
2011 }
2012
2013 needed_blocks = ext4_writepage_trans_blocks(inode);
2014
2015 iloc.bh = NULL;
2016 error = ext4_get_inode_loc(inode, &iloc);
2017 if (error)
2018 return error;
2019
2020 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2021 if (IS_ERR(handle)) {
2022 error = PTR_ERR(handle);
2023 goto out_free;
2024 }
2025
2026 ext4_write_lock_xattr(inode, &no_expand);
2027 if (ext4_has_inline_data(inode))
2028 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2029 ext4_write_unlock_xattr(inode, &no_expand);
2030 ext4_journal_stop(handle);
2031 out_free:
2032 brelse(iloc.bh);
2033 return error;
2034 }
2035