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/namei.h>
10 #include <linux/iversion.h>
11 #include <linux/sched/mm.h>
12
13 #include "ext4_jbd2.h"
14 #include "ext4.h"
15 #include "xattr.h"
16 #include "truncate.h"
17
18 #define EXT4_XATTR_SYSTEM_DATA "data"
19 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
20 #define EXT4_INLINE_DOTDOT_OFFSET 2
21 #define EXT4_INLINE_DOTDOT_SIZE 4
22
ext4_get_inline_size(struct inode * inode)23 static int ext4_get_inline_size(struct inode *inode)
24 {
25 if (EXT4_I(inode)->i_inline_off)
26 return EXT4_I(inode)->i_inline_size;
27
28 return 0;
29 }
30
get_max_inline_xattr_value_size(struct inode * inode,struct ext4_iloc * iloc)31 static int get_max_inline_xattr_value_size(struct inode *inode,
32 struct ext4_iloc *iloc)
33 {
34 struct ext4_xattr_ibody_header *header;
35 struct ext4_xattr_entry *entry;
36 struct ext4_inode *raw_inode;
37 void *end;
38 int free, min_offs;
39
40 if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
41 return 0;
42
43 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 EXT4_GOOD_OLD_INODE_SIZE -
45 EXT4_I(inode)->i_extra_isize -
46 sizeof(struct ext4_xattr_ibody_header);
47
48 /*
49 * We need to subtract another sizeof(__u32) since an in-inode xattr
50 * needs an empty 4 bytes to indicate the gap between the xattr entry
51 * and the name/value pair.
52 */
53 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 return EXT4_XATTR_SIZE(min_offs -
55 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 EXT4_XATTR_ROUND - sizeof(__u32));
57
58 raw_inode = ext4_raw_inode(iloc);
59 header = IHDR(inode, raw_inode);
60 entry = IFIRST(header);
61 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
62
63 /* Compute min_offs. */
64 while (!IS_LAST_ENTRY(entry)) {
65 void *next = EXT4_XATTR_NEXT(entry);
66
67 if (next >= end) {
68 EXT4_ERROR_INODE(inode,
69 "corrupt xattr in inline inode");
70 return 0;
71 }
72 if (!entry->e_value_inum && entry->e_value_size) {
73 size_t offs = le16_to_cpu(entry->e_value_offs);
74 if (offs < min_offs)
75 min_offs = offs;
76 }
77 entry = next;
78 }
79 free = min_offs -
80 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
81
82 if (EXT4_I(inode)->i_inline_off) {
83 entry = (struct ext4_xattr_entry *)
84 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
85
86 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
87 goto out;
88 }
89
90 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
91
92 if (free > EXT4_XATTR_ROUND)
93 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
94 else
95 free = 0;
96
97 out:
98 return free;
99 }
100
101 /*
102 * Get the maximum size we now can store in an inode.
103 * If we can't find the space for a xattr entry, don't use the space
104 * of the extents since we have no space to indicate the inline data.
105 */
ext4_get_max_inline_size(struct inode * inode)106 int ext4_get_max_inline_size(struct inode *inode)
107 {
108 int error, max_inline_size;
109 struct ext4_iloc iloc;
110
111 if (EXT4_I(inode)->i_extra_isize == 0)
112 return 0;
113
114 error = ext4_get_inode_loc(inode, &iloc);
115 if (error) {
116 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
117 "can't get inode location %lu",
118 inode->i_ino);
119 return 0;
120 }
121
122 down_read(&EXT4_I(inode)->xattr_sem);
123 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
124 up_read(&EXT4_I(inode)->xattr_sem);
125
126 brelse(iloc.bh);
127
128 if (!max_inline_size)
129 return 0;
130
131 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
132 }
133
134 /*
135 * this function does not take xattr_sem, which is OK because it is
136 * currently only used in a code path coming form ext4_iget, before
137 * the new inode has been unlocked
138 */
ext4_find_inline_data_nolock(struct inode * inode)139 int ext4_find_inline_data_nolock(struct inode *inode)
140 {
141 struct ext4_xattr_ibody_find is = {
142 .s = { .not_found = -ENODATA, },
143 };
144 struct ext4_xattr_info i = {
145 .name_index = EXT4_XATTR_INDEX_SYSTEM,
146 .name = EXT4_XATTR_SYSTEM_DATA,
147 };
148 int error;
149
150 if (EXT4_I(inode)->i_extra_isize == 0)
151 return 0;
152
153 error = ext4_get_inode_loc(inode, &is.iloc);
154 if (error)
155 return error;
156
157 error = ext4_xattr_ibody_find(inode, &i, &is);
158 if (error)
159 goto out;
160
161 if (!is.s.not_found) {
162 if (is.s.here->e_value_inum) {
163 EXT4_ERROR_INODE(inode, "inline data xattr refers "
164 "to an external xattr inode");
165 error = -EFSCORRUPTED;
166 goto out;
167 }
168 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
169 (void *)ext4_raw_inode(&is.iloc));
170 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
171 le32_to_cpu(is.s.here->e_value_size);
172 }
173 out:
174 brelse(is.iloc.bh);
175 return error;
176 }
177
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)178 static int ext4_read_inline_data(struct inode *inode, void *buffer,
179 unsigned int len,
180 struct ext4_iloc *iloc)
181 {
182 struct ext4_xattr_entry *entry;
183 struct ext4_xattr_ibody_header *header;
184 int cp_len = 0;
185 struct ext4_inode *raw_inode;
186
187 if (!len)
188 return 0;
189
190 BUG_ON(len > EXT4_I(inode)->i_inline_size);
191
192 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
193 len : EXT4_MIN_INLINE_DATA_SIZE;
194
195 raw_inode = ext4_raw_inode(iloc);
196 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
197
198 len -= cp_len;
199 buffer += cp_len;
200
201 if (!len)
202 goto out;
203
204 header = IHDR(inode, raw_inode);
205 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
206 EXT4_I(inode)->i_inline_off);
207 len = min_t(unsigned int, len,
208 (unsigned int)le32_to_cpu(entry->e_value_size));
209
210 memcpy(buffer,
211 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
212 cp_len += len;
213
214 out:
215 return cp_len;
216 }
217
218 /*
219 * write the buffer to the inline inode.
220 * If 'create' is set, we don't need to do the extra copy in the xattr
221 * value since it is already handled by ext4_xattr_ibody_set.
222 * That saves us one memcpy.
223 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)224 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
225 void *buffer, loff_t pos, unsigned int len)
226 {
227 struct ext4_xattr_entry *entry;
228 struct ext4_xattr_ibody_header *header;
229 struct ext4_inode *raw_inode;
230 int cp_len = 0;
231
232 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
233 return;
234
235 BUG_ON(!EXT4_I(inode)->i_inline_off);
236 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
237
238 raw_inode = ext4_raw_inode(iloc);
239 buffer += pos;
240
241 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
242 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
243 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
244 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
245
246 len -= cp_len;
247 buffer += cp_len;
248 pos += cp_len;
249 }
250
251 if (!len)
252 return;
253
254 pos -= EXT4_MIN_INLINE_DATA_SIZE;
255 header = IHDR(inode, raw_inode);
256 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
257 EXT4_I(inode)->i_inline_off);
258
259 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
260 buffer, len);
261 }
262
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)263 static int ext4_create_inline_data(handle_t *handle,
264 struct inode *inode, unsigned len)
265 {
266 int error;
267 void *value = NULL;
268 struct ext4_xattr_ibody_find is = {
269 .s = { .not_found = -ENODATA, },
270 };
271 struct ext4_xattr_info i = {
272 .name_index = EXT4_XATTR_INDEX_SYSTEM,
273 .name = EXT4_XATTR_SYSTEM_DATA,
274 };
275
276 error = ext4_get_inode_loc(inode, &is.iloc);
277 if (error)
278 return error;
279
280 BUFFER_TRACE(is.iloc.bh, "get_write_access");
281 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
282 EXT4_JTR_NONE);
283 if (error)
284 goto out;
285
286 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
287 value = EXT4_ZERO_XATTR_VALUE;
288 len -= EXT4_MIN_INLINE_DATA_SIZE;
289 } else {
290 value = "";
291 len = 0;
292 }
293
294 /* Insert the xttr entry. */
295 i.value = value;
296 i.value_len = len;
297
298 error = ext4_xattr_ibody_find(inode, &i, &is);
299 if (error)
300 goto out;
301
302 BUG_ON(!is.s.not_found);
303
304 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
305 if (error) {
306 if (error == -ENOSPC)
307 ext4_clear_inode_state(inode,
308 EXT4_STATE_MAY_INLINE_DATA);
309 goto out;
310 }
311
312 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
313 0, EXT4_MIN_INLINE_DATA_SIZE);
314
315 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
316 (void *)ext4_raw_inode(&is.iloc));
317 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
318 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
319 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
320 get_bh(is.iloc.bh);
321 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
322
323 out:
324 brelse(is.iloc.bh);
325 return error;
326 }
327
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)328 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
329 unsigned int len)
330 {
331 int error;
332 void *value = NULL;
333 struct ext4_xattr_ibody_find is = {
334 .s = { .not_found = -ENODATA, },
335 };
336 struct ext4_xattr_info i = {
337 .name_index = EXT4_XATTR_INDEX_SYSTEM,
338 .name = EXT4_XATTR_SYSTEM_DATA,
339 };
340
341 /* If the old space is ok, write the data directly. */
342 if (len <= EXT4_I(inode)->i_inline_size)
343 return 0;
344
345 error = ext4_get_inode_loc(inode, &is.iloc);
346 if (error)
347 return error;
348
349 error = ext4_xattr_ibody_find(inode, &i, &is);
350 if (error)
351 goto out;
352
353 BUG_ON(is.s.not_found);
354
355 len -= EXT4_MIN_INLINE_DATA_SIZE;
356 value = kzalloc(len, GFP_NOFS);
357 if (!value) {
358 error = -ENOMEM;
359 goto out;
360 }
361
362 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
363 value, len);
364 if (error < 0)
365 goto out;
366
367 BUFFER_TRACE(is.iloc.bh, "get_write_access");
368 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
369 EXT4_JTR_NONE);
370 if (error)
371 goto out;
372
373 /* Update the xattr entry. */
374 i.value = value;
375 i.value_len = len;
376
377 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
378 if (error)
379 goto out;
380
381 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
382 (void *)ext4_raw_inode(&is.iloc));
383 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
384 le32_to_cpu(is.s.here->e_value_size);
385 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
386 get_bh(is.iloc.bh);
387 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
388
389 out:
390 kfree(value);
391 brelse(is.iloc.bh);
392 return error;
393 }
394
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)395 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
396 unsigned int len)
397 {
398 int ret, size, no_expand;
399 struct ext4_inode_info *ei = EXT4_I(inode);
400
401 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
402 return -ENOSPC;
403
404 size = ext4_get_max_inline_size(inode);
405 if (size < len)
406 return -ENOSPC;
407
408 ext4_write_lock_xattr(inode, &no_expand);
409
410 if (ei->i_inline_off)
411 ret = ext4_update_inline_data(handle, inode, len);
412 else
413 ret = ext4_create_inline_data(handle, inode, len);
414
415 ext4_write_unlock_xattr(inode, &no_expand);
416 return ret;
417 }
418
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)419 static int ext4_destroy_inline_data_nolock(handle_t *handle,
420 struct inode *inode)
421 {
422 struct ext4_inode_info *ei = EXT4_I(inode);
423 struct ext4_xattr_ibody_find is = {
424 .s = { .not_found = 0, },
425 };
426 struct ext4_xattr_info i = {
427 .name_index = EXT4_XATTR_INDEX_SYSTEM,
428 .name = EXT4_XATTR_SYSTEM_DATA,
429 .value = NULL,
430 .value_len = 0,
431 };
432 int error;
433
434 if (!ei->i_inline_off)
435 return 0;
436
437 error = ext4_get_inode_loc(inode, &is.iloc);
438 if (error)
439 return error;
440
441 error = ext4_xattr_ibody_find(inode, &i, &is);
442 if (error)
443 goto out;
444
445 BUFFER_TRACE(is.iloc.bh, "get_write_access");
446 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
447 EXT4_JTR_NONE);
448 if (error)
449 goto out;
450
451 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
452 if (error)
453 goto out;
454
455 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
456 0, EXT4_MIN_INLINE_DATA_SIZE);
457 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
458
459 if (ext4_has_feature_extents(inode->i_sb)) {
460 if (S_ISDIR(inode->i_mode) ||
461 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
462 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
463 ext4_ext_tree_init(handle, inode);
464 }
465 }
466 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
467
468 get_bh(is.iloc.bh);
469 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
470
471 EXT4_I(inode)->i_inline_off = 0;
472 EXT4_I(inode)->i_inline_size = 0;
473 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
474 out:
475 brelse(is.iloc.bh);
476 if (error == -ENODATA)
477 error = 0;
478 return error;
479 }
480
ext4_read_inline_page(struct inode * inode,struct page * page)481 static int ext4_read_inline_page(struct inode *inode, struct page *page)
482 {
483 void *kaddr;
484 int ret = 0;
485 size_t len;
486 struct ext4_iloc iloc;
487
488 BUG_ON(!PageLocked(page));
489 BUG_ON(!ext4_has_inline_data(inode));
490 BUG_ON(page->index);
491
492 if (!EXT4_I(inode)->i_inline_off) {
493 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
494 inode->i_ino);
495 goto out;
496 }
497
498 ret = ext4_get_inode_loc(inode, &iloc);
499 if (ret)
500 goto out;
501
502 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
503 kaddr = kmap_atomic(page);
504 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
505 flush_dcache_page(page);
506 kunmap_atomic(kaddr);
507 zero_user_segment(page, len, PAGE_SIZE);
508 SetPageUptodate(page);
509 brelse(iloc.bh);
510
511 out:
512 return ret;
513 }
514
ext4_readpage_inline(struct inode * inode,struct page * page)515 int ext4_readpage_inline(struct inode *inode, struct page *page)
516 {
517 int ret = 0;
518
519 down_read(&EXT4_I(inode)->xattr_sem);
520 if (!ext4_has_inline_data(inode)) {
521 up_read(&EXT4_I(inode)->xattr_sem);
522 return -EAGAIN;
523 }
524
525 /*
526 * Current inline data can only exist in the 1st page,
527 * So for all the other pages, just set them uptodate.
528 */
529 if (!page->index)
530 ret = ext4_read_inline_page(inode, page);
531 else if (!PageUptodate(page)) {
532 zero_user_segment(page, 0, PAGE_SIZE);
533 SetPageUptodate(page);
534 }
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)542 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
543 struct inode *inode)
544 {
545 int ret, needed_blocks, no_expand;
546 handle_t *handle = NULL;
547 int retries = 0, sem_held = 0;
548 struct page *page = NULL;
549 unsigned int flags;
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 = memalloc_nofs_save();
579 page = grab_cache_page_write_begin(mapping, 0);
580 memalloc_nofs_restore(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, inode, 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,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 struct page **pagep)
666 {
667 int ret;
668 handle_t *handle;
669 unsigned int flags;
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, inode->i_sb, iloc.bh,
703 EXT4_JTR_NONE);
704 if (ret)
705 goto out;
706
707 flags = memalloc_nofs_save();
708 page = grab_cache_page_write_begin(mapping, 0);
709 memalloc_nofs_restore(flags);
710 if (!page) {
711 ret = -ENOMEM;
712 goto out;
713 }
714
715 *pagep = page;
716 down_read(&EXT4_I(inode)->xattr_sem);
717 if (!ext4_has_inline_data(inode)) {
718 ret = 0;
719 unlock_page(page);
720 put_page(page);
721 goto out_up_read;
722 }
723
724 if (!PageUptodate(page)) {
725 ret = ext4_read_inline_page(inode, page);
726 if (ret < 0) {
727 unlock_page(page);
728 put_page(page);
729 goto out_up_read;
730 }
731 }
732
733 ret = 1;
734 handle = NULL;
735 out_up_read:
736 up_read(&EXT4_I(inode)->xattr_sem);
737 out:
738 if (handle && (ret != 1))
739 ext4_journal_stop(handle);
740 brelse(iloc.bh);
741 return ret;
742 convert:
743 return ext4_convert_inline_data_to_extent(mapping, inode);
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 handle_t *handle = ext4_journal_current_handle();
750 int no_expand;
751 void *kaddr;
752 struct ext4_iloc iloc;
753 int ret = 0, ret2;
754
755 if (unlikely(copied < len) && !PageUptodate(page))
756 copied = 0;
757
758 if (likely(copied)) {
759 ret = ext4_get_inode_loc(inode, &iloc);
760 if (ret) {
761 unlock_page(page);
762 put_page(page);
763 ext4_std_error(inode->i_sb, ret);
764 goto out;
765 }
766 ext4_write_lock_xattr(inode, &no_expand);
767 BUG_ON(!ext4_has_inline_data(inode));
768
769 /*
770 * ei->i_inline_off may have changed since
771 * ext4_write_begin() called
772 * ext4_try_to_write_inline_data()
773 */
774 (void) ext4_find_inline_data_nolock(inode);
775
776 kaddr = kmap_atomic(page);
777 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
778 kunmap_atomic(kaddr);
779 SetPageUptodate(page);
780 /* clear page dirty so that writepages wouldn't work for us. */
781 ClearPageDirty(page);
782
783 ext4_write_unlock_xattr(inode, &no_expand);
784 brelse(iloc.bh);
785
786 /*
787 * It's important to update i_size while still holding page
788 * lock: page writeout could otherwise come in and zero
789 * beyond i_size.
790 */
791 ext4_update_inode_size(inode, pos + copied);
792 }
793 unlock_page(page);
794 put_page(page);
795
796 /*
797 * Don't mark the inode dirty under page lock. First, it unnecessarily
798 * makes the holding time of page lock longer. Second, it forces lock
799 * ordering of page lock and transaction start for journaling
800 * filesystems.
801 */
802 if (likely(copied))
803 mark_inode_dirty(inode);
804 out:
805 /*
806 * If we didn't copy as much data as expected, we need to trim back
807 * size of xattr containing inline data.
808 */
809 if (pos + len > inode->i_size && ext4_can_truncate(inode))
810 ext4_orphan_add(handle, inode);
811
812 ret2 = ext4_journal_stop(handle);
813 if (!ret)
814 ret = ret2;
815 if (pos + len > inode->i_size) {
816 ext4_truncate_failed_write(inode);
817 /*
818 * If truncate failed early the inode might still be
819 * on the orphan list; we need to make sure the inode
820 * is removed from the orphan list in that case.
821 */
822 if (inode->i_nlink)
823 ext4_orphan_del(NULL, inode);
824 }
825 return ret ? ret : copied;
826 }
827
828 struct buffer_head *
ext4_journalled_write_inline_data(struct inode * inode,unsigned len,struct page * page)829 ext4_journalled_write_inline_data(struct inode *inode,
830 unsigned len,
831 struct page *page)
832 {
833 int ret, no_expand;
834 void *kaddr;
835 struct ext4_iloc iloc;
836
837 ret = ext4_get_inode_loc(inode, &iloc);
838 if (ret) {
839 ext4_std_error(inode->i_sb, ret);
840 return NULL;
841 }
842
843 ext4_write_lock_xattr(inode, &no_expand);
844 kaddr = kmap_atomic(page);
845 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
846 kunmap_atomic(kaddr);
847 ext4_write_unlock_xattr(inode, &no_expand);
848
849 return iloc.bh;
850 }
851
852 /*
853 * Try to make the page cache and handle ready for the inline data case.
854 * We can call this function in 2 cases:
855 * 1. The inode is created and the first write exceeds inline size. We can
856 * clear the inode state safely.
857 * 2. The inode has inline data, then we need to read the data, make it
858 * update and dirty so that ext4_da_writepages can handle it. We don't
859 * need to start the journal since the file's metadata isn't changed now.
860 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,void ** fsdata)861 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
862 struct inode *inode,
863 void **fsdata)
864 {
865 int ret = 0, inline_size;
866 struct page *page;
867
868 page = grab_cache_page_write_begin(mapping, 0);
869 if (!page)
870 return -ENOMEM;
871
872 down_read(&EXT4_I(inode)->xattr_sem);
873 if (!ext4_has_inline_data(inode)) {
874 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
875 goto out;
876 }
877
878 inline_size = ext4_get_inline_size(inode);
879
880 if (!PageUptodate(page)) {
881 ret = ext4_read_inline_page(inode, page);
882 if (ret < 0)
883 goto out;
884 }
885
886 ret = __block_write_begin(page, 0, inline_size,
887 ext4_da_get_block_prep);
888 if (ret) {
889 up_read(&EXT4_I(inode)->xattr_sem);
890 unlock_page(page);
891 put_page(page);
892 ext4_truncate_failed_write(inode);
893 return ret;
894 }
895
896 SetPageDirty(page);
897 SetPageUptodate(page);
898 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
899 *fsdata = (void *)CONVERT_INLINE_DATA;
900
901 out:
902 up_read(&EXT4_I(inode)->xattr_sem);
903 if (page) {
904 unlock_page(page);
905 put_page(page);
906 }
907 return ret;
908 }
909
910 /*
911 * Prepare the write for the inline data.
912 * If the data can be written into the inode, we just read
913 * the page and make it uptodate, and start the journal.
914 * Otherwise read the page, makes it dirty so that it can be
915 * handle in writepages(the i_disksize update is left to the
916 * normal ext4_da_write_end).
917 */
ext4_da_write_inline_data_begin(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)918 int ext4_da_write_inline_data_begin(struct address_space *mapping,
919 struct inode *inode,
920 loff_t pos, unsigned len,
921 struct page **pagep,
922 void **fsdata)
923 {
924 int ret;
925 handle_t *handle;
926 struct page *page;
927 struct ext4_iloc iloc;
928 int retries = 0;
929 unsigned int flags;
930
931 ret = ext4_get_inode_loc(inode, &iloc);
932 if (ret)
933 return ret;
934
935 retry_journal:
936 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
937 if (IS_ERR(handle)) {
938 ret = PTR_ERR(handle);
939 goto out;
940 }
941
942 ret = ext4_prepare_inline_data(handle, inode, pos + len);
943 if (ret && ret != -ENOSPC)
944 goto out_journal;
945
946 if (ret == -ENOSPC) {
947 ext4_journal_stop(handle);
948 ret = ext4_da_convert_inline_data_to_extent(mapping,
949 inode,
950 fsdata);
951 if (ret == -ENOSPC &&
952 ext4_should_retry_alloc(inode->i_sb, &retries))
953 goto retry_journal;
954 goto out;
955 }
956
957 /*
958 * We cannot recurse into the filesystem as the transaction
959 * is already started.
960 */
961 flags = memalloc_nofs_save();
962 page = grab_cache_page_write_begin(mapping, 0);
963 memalloc_nofs_restore(flags);
964 if (!page) {
965 ret = -ENOMEM;
966 goto out_journal;
967 }
968
969 down_read(&EXT4_I(inode)->xattr_sem);
970 if (!ext4_has_inline_data(inode)) {
971 ret = 0;
972 goto out_release_page;
973 }
974
975 if (!PageUptodate(page)) {
976 ret = ext4_read_inline_page(inode, page);
977 if (ret < 0)
978 goto out_release_page;
979 }
980 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
981 EXT4_JTR_NONE);
982 if (ret)
983 goto out_release_page;
984
985 up_read(&EXT4_I(inode)->xattr_sem);
986 *pagep = page;
987 brelse(iloc.bh);
988 return 1;
989 out_release_page:
990 up_read(&EXT4_I(inode)->xattr_sem);
991 unlock_page(page);
992 put_page(page);
993 out_journal:
994 ext4_journal_stop(handle);
995 out:
996 brelse(iloc.bh);
997 return ret;
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, 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, 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, dir->i_sb, iloc->bh,
1050 EXT4_JTR_NONE);
1051 if (err)
1052 return err;
1053 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1054
1055 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1056
1057 /*
1058 * XXX shouldn't update any times until successful
1059 * completion of syscall, but too many callers depend
1060 * on this.
1061 *
1062 * XXX similarly, too many callers depend on
1063 * ext4_new_inode() setting the times, but error
1064 * recovery deletes the inode, so the worst that can
1065 * happen is that the times are slightly out of date
1066 * and/or different from the directory change time.
1067 */
1068 dir->i_mtime = dir->i_ctime = current_time(dir);
1069 ext4_update_dx_flag(dir);
1070 inode_inc_iversion(dir);
1071 return 1;
1072 }
1073
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)1074 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1075 struct ext4_iloc *iloc)
1076 {
1077 struct ext4_xattr_entry *entry;
1078 struct ext4_xattr_ibody_header *header;
1079
1080 BUG_ON(!EXT4_I(inode)->i_inline_off);
1081
1082 header = IHDR(inode, ext4_raw_inode(iloc));
1083 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1084 EXT4_I(inode)->i_inline_off);
1085
1086 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1087 }
1088
1089 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)1090 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1091 {
1092 struct ext4_dir_entry_2 *de, *prev_de;
1093 void *limit;
1094 int de_len;
1095
1096 de = de_buf;
1097 if (old_size) {
1098 limit = de_buf + old_size;
1099 do {
1100 prev_de = de;
1101 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1102 de_buf += de_len;
1103 de = de_buf;
1104 } while (de_buf < limit);
1105
1106 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1107 old_size, new_size);
1108 } else {
1109 /* this is just created, so create an empty entry. */
1110 de->inode = 0;
1111 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1112 }
1113 }
1114
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1115 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1116 struct ext4_iloc *iloc)
1117 {
1118 int ret;
1119 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1120 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1121
1122 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1123 return -ENOSPC;
1124
1125 ret = ext4_update_inline_data(handle, dir,
1126 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1127 if (ret)
1128 return ret;
1129
1130 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1131 EXT4_I(dir)->i_inline_size -
1132 EXT4_MIN_INLINE_DATA_SIZE);
1133 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1134 return 0;
1135 }
1136
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1137 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1138 struct ext4_iloc *iloc,
1139 void *buf, int inline_size)
1140 {
1141 int ret;
1142
1143 ret = ext4_create_inline_data(handle, inode, inline_size);
1144 if (ret) {
1145 ext4_msg(inode->i_sb, KERN_EMERG,
1146 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1147 inode->i_ino, ret);
1148 return;
1149 }
1150 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1151 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1152 }
1153
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1154 static int ext4_finish_convert_inline_dir(handle_t *handle,
1155 struct inode *inode,
1156 struct buffer_head *dir_block,
1157 void *buf,
1158 int inline_size)
1159 {
1160 int err, csum_size = 0, header_size = 0;
1161 struct ext4_dir_entry_2 *de;
1162 void *target = dir_block->b_data;
1163
1164 /*
1165 * First create "." and ".." and then copy the dir information
1166 * back to the block.
1167 */
1168 de = target;
1169 de = ext4_init_dot_dotdot(inode, de,
1170 inode->i_sb->s_blocksize, csum_size,
1171 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1172 header_size = (void *)de - target;
1173
1174 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1175 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1176
1177 if (ext4_has_metadata_csum(inode->i_sb))
1178 csum_size = sizeof(struct ext4_dir_entry_tail);
1179
1180 inode->i_size = inode->i_sb->s_blocksize;
1181 i_size_write(inode, inode->i_sb->s_blocksize);
1182 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1183 ext4_update_final_de(dir_block->b_data,
1184 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1185 inode->i_sb->s_blocksize - csum_size);
1186
1187 if (csum_size)
1188 ext4_initialize_dirent_tail(dir_block,
1189 inode->i_sb->s_blocksize);
1190 set_buffer_uptodate(dir_block);
1191 unlock_buffer(dir_block);
1192 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1193 if (err)
1194 return err;
1195 set_buffer_verified(dir_block);
1196 return ext4_mark_inode_dirty(handle, inode);
1197 }
1198
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1199 static int ext4_convert_inline_data_nolock(handle_t *handle,
1200 struct inode *inode,
1201 struct ext4_iloc *iloc)
1202 {
1203 int error;
1204 void *buf = NULL;
1205 struct buffer_head *data_bh = NULL;
1206 struct ext4_map_blocks map;
1207 int inline_size;
1208
1209 inline_size = ext4_get_inline_size(inode);
1210 buf = kmalloc(inline_size, GFP_NOFS);
1211 if (!buf) {
1212 error = -ENOMEM;
1213 goto out;
1214 }
1215
1216 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1217 if (error < 0)
1218 goto out;
1219
1220 /*
1221 * Make sure the inline directory entries pass checks before we try to
1222 * convert them, so that we avoid touching stuff that needs fsck.
1223 */
1224 if (S_ISDIR(inode->i_mode)) {
1225 error = ext4_check_all_de(inode, iloc->bh,
1226 buf + EXT4_INLINE_DOTDOT_SIZE,
1227 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1228 if (error)
1229 goto out;
1230 }
1231
1232 error = ext4_destroy_inline_data_nolock(handle, inode);
1233 if (error)
1234 goto out;
1235
1236 map.m_lblk = 0;
1237 map.m_len = 1;
1238 map.m_flags = 0;
1239 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1240 if (error < 0)
1241 goto out_restore;
1242 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1243 error = -EIO;
1244 goto out_restore;
1245 }
1246
1247 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1248 if (!data_bh) {
1249 error = -ENOMEM;
1250 goto out_restore;
1251 }
1252
1253 lock_buffer(data_bh);
1254 error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1255 EXT4_JTR_NONE);
1256 if (error) {
1257 unlock_buffer(data_bh);
1258 error = -EIO;
1259 goto out_restore;
1260 }
1261 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1262
1263 if (!S_ISDIR(inode->i_mode)) {
1264 memcpy(data_bh->b_data, buf, inline_size);
1265 set_buffer_uptodate(data_bh);
1266 unlock_buffer(data_bh);
1267 error = ext4_handle_dirty_metadata(handle,
1268 inode, data_bh);
1269 } else {
1270 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1271 buf, inline_size);
1272 }
1273
1274 out_restore:
1275 if (error)
1276 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1277
1278 out:
1279 brelse(data_bh);
1280 kfree(buf);
1281 return error;
1282 }
1283
1284 /*
1285 * Try to add the new entry to the inline data.
1286 * If succeeds, return 0. If not, extended the inline dir and copied data to
1287 * the new created block.
1288 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1289 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1290 struct inode *dir, struct inode *inode)
1291 {
1292 int ret, ret2, inline_size, no_expand;
1293 void *inline_start;
1294 struct ext4_iloc iloc;
1295
1296 ret = ext4_get_inode_loc(dir, &iloc);
1297 if (ret)
1298 return ret;
1299
1300 ext4_write_lock_xattr(dir, &no_expand);
1301 if (!ext4_has_inline_data(dir))
1302 goto out;
1303
1304 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1305 EXT4_INLINE_DOTDOT_SIZE;
1306 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1307
1308 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1309 inline_start, inline_size);
1310 if (ret != -ENOSPC)
1311 goto out;
1312
1313 /* check whether it can be inserted to inline xattr space. */
1314 inline_size = EXT4_I(dir)->i_inline_size -
1315 EXT4_MIN_INLINE_DATA_SIZE;
1316 if (!inline_size) {
1317 /* Try to use the xattr space.*/
1318 ret = ext4_update_inline_dir(handle, dir, &iloc);
1319 if (ret && ret != -ENOSPC)
1320 goto out;
1321
1322 inline_size = EXT4_I(dir)->i_inline_size -
1323 EXT4_MIN_INLINE_DATA_SIZE;
1324 }
1325
1326 if (inline_size) {
1327 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1328
1329 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1330 inode, &iloc, inline_start,
1331 inline_size);
1332
1333 if (ret != -ENOSPC)
1334 goto out;
1335 }
1336
1337 /*
1338 * The inline space is filled up, so create a new block for it.
1339 * As the extent tree will be created, we have to save the inline
1340 * dir first.
1341 */
1342 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1343
1344 out:
1345 ext4_write_unlock_xattr(dir, &no_expand);
1346 ret2 = ext4_mark_inode_dirty(handle, dir);
1347 if (unlikely(ret2 && !ret))
1348 ret = ret2;
1349 brelse(iloc.bh);
1350 return ret;
1351 }
1352
1353 /*
1354 * This function fills a red-black tree with information from an
1355 * inlined dir. It returns the number directory entries loaded
1356 * into the tree. If there is an error it is returned in err.
1357 */
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)1358 int ext4_inlinedir_to_tree(struct file *dir_file,
1359 struct inode *dir, ext4_lblk_t block,
1360 struct dx_hash_info *hinfo,
1361 __u32 start_hash, __u32 start_minor_hash,
1362 int *has_inline_data)
1363 {
1364 int err = 0, count = 0;
1365 unsigned int parent_ino;
1366 int pos;
1367 struct ext4_dir_entry_2 *de;
1368 struct inode *inode = file_inode(dir_file);
1369 int ret, inline_size = 0;
1370 struct ext4_iloc iloc;
1371 void *dir_buf = NULL;
1372 struct ext4_dir_entry_2 fake;
1373 struct fscrypt_str tmp_str;
1374
1375 ret = ext4_get_inode_loc(inode, &iloc);
1376 if (ret)
1377 return ret;
1378
1379 down_read(&EXT4_I(inode)->xattr_sem);
1380 if (!ext4_has_inline_data(inode)) {
1381 up_read(&EXT4_I(inode)->xattr_sem);
1382 *has_inline_data = 0;
1383 goto out;
1384 }
1385
1386 inline_size = ext4_get_inline_size(inode);
1387 dir_buf = kmalloc(inline_size, GFP_NOFS);
1388 if (!dir_buf) {
1389 ret = -ENOMEM;
1390 up_read(&EXT4_I(inode)->xattr_sem);
1391 goto out;
1392 }
1393
1394 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1395 up_read(&EXT4_I(inode)->xattr_sem);
1396 if (ret < 0)
1397 goto out;
1398
1399 pos = 0;
1400 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1401 while (pos < inline_size) {
1402 /*
1403 * As inlined dir doesn't store any information about '.' and
1404 * only the inode number of '..' is stored, we have to handle
1405 * them differently.
1406 */
1407 if (pos == 0) {
1408 fake.inode = cpu_to_le32(inode->i_ino);
1409 fake.name_len = 1;
1410 strcpy(fake.name, ".");
1411 fake.rec_len = ext4_rec_len_to_disk(
1412 ext4_dir_rec_len(fake.name_len, NULL),
1413 inline_size);
1414 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1415 de = &fake;
1416 pos = EXT4_INLINE_DOTDOT_OFFSET;
1417 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1418 fake.inode = cpu_to_le32(parent_ino);
1419 fake.name_len = 2;
1420 strcpy(fake.name, "..");
1421 fake.rec_len = ext4_rec_len_to_disk(
1422 ext4_dir_rec_len(fake.name_len, NULL),
1423 inline_size);
1424 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1425 de = &fake;
1426 pos = EXT4_INLINE_DOTDOT_SIZE;
1427 } else {
1428 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1429 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1430 if (ext4_check_dir_entry(inode, dir_file, de,
1431 iloc.bh, dir_buf,
1432 inline_size, pos)) {
1433 ret = count;
1434 goto out;
1435 }
1436 }
1437
1438 if (ext4_hash_in_dirent(dir)) {
1439 hinfo->hash = EXT4_DIRENT_HASH(de);
1440 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1441 } else {
1442 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1443 }
1444 if ((hinfo->hash < start_hash) ||
1445 ((hinfo->hash == start_hash) &&
1446 (hinfo->minor_hash < start_minor_hash)))
1447 continue;
1448 if (de->inode == 0)
1449 continue;
1450 tmp_str.name = de->name;
1451 tmp_str.len = de->name_len;
1452 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1453 hinfo->minor_hash, de, &tmp_str);
1454 if (err) {
1455 ret = err;
1456 goto out;
1457 }
1458 count++;
1459 }
1460 ret = count;
1461 out:
1462 kfree(dir_buf);
1463 brelse(iloc.bh);
1464 return ret;
1465 }
1466
1467 /*
1468 * So this function is called when the volume is mkfsed with
1469 * dir_index disabled. In order to keep f_pos persistent
1470 * after we convert from an inlined dir to a blocked based,
1471 * we just pretend that we are a normal dir and return the
1472 * offset as if '.' and '..' really take place.
1473 *
1474 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1475 int ext4_read_inline_dir(struct file *file,
1476 struct dir_context *ctx,
1477 int *has_inline_data)
1478 {
1479 unsigned int offset, parent_ino;
1480 int i;
1481 struct ext4_dir_entry_2 *de;
1482 struct super_block *sb;
1483 struct inode *inode = file_inode(file);
1484 int ret, inline_size = 0;
1485 struct ext4_iloc iloc;
1486 void *dir_buf = NULL;
1487 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1488
1489 ret = ext4_get_inode_loc(inode, &iloc);
1490 if (ret)
1491 return ret;
1492
1493 down_read(&EXT4_I(inode)->xattr_sem);
1494 if (!ext4_has_inline_data(inode)) {
1495 up_read(&EXT4_I(inode)->xattr_sem);
1496 *has_inline_data = 0;
1497 goto out;
1498 }
1499
1500 inline_size = ext4_get_inline_size(inode);
1501 dir_buf = kmalloc(inline_size, GFP_NOFS);
1502 if (!dir_buf) {
1503 ret = -ENOMEM;
1504 up_read(&EXT4_I(inode)->xattr_sem);
1505 goto out;
1506 }
1507
1508 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1509 up_read(&EXT4_I(inode)->xattr_sem);
1510 if (ret < 0)
1511 goto out;
1512
1513 ret = 0;
1514 sb = inode->i_sb;
1515 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1516 offset = ctx->pos;
1517
1518 /*
1519 * dotdot_offset and dotdot_size is the real offset and
1520 * size for ".." and "." if the dir is block based while
1521 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1522 * So we will use extra_offset and extra_size to indicate them
1523 * during the inline dir iteration.
1524 */
1525 dotdot_offset = ext4_dir_rec_len(1, NULL);
1526 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1527 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1528 extra_size = extra_offset + inline_size;
1529
1530 /*
1531 * If the version has changed since the last call to
1532 * readdir(2), then we might be pointing to an invalid
1533 * dirent right now. Scan from the start of the inline
1534 * dir to make sure.
1535 */
1536 if (!inode_eq_iversion(inode, file->f_version)) {
1537 for (i = 0; i < extra_size && i < offset;) {
1538 /*
1539 * "." is with offset 0 and
1540 * ".." is dotdot_offset.
1541 */
1542 if (!i) {
1543 i = dotdot_offset;
1544 continue;
1545 } else if (i == dotdot_offset) {
1546 i = dotdot_size;
1547 continue;
1548 }
1549 /* for other entry, the real offset in
1550 * the buf has to be tuned accordingly.
1551 */
1552 de = (struct ext4_dir_entry_2 *)
1553 (dir_buf + i - extra_offset);
1554 /* It's too expensive to do a full
1555 * dirent test each time round this
1556 * loop, but we do have to test at
1557 * least that it is non-zero. A
1558 * failure will be detected in the
1559 * dirent test below. */
1560 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1561 < ext4_dir_rec_len(1, NULL))
1562 break;
1563 i += ext4_rec_len_from_disk(de->rec_len,
1564 extra_size);
1565 }
1566 offset = i;
1567 ctx->pos = offset;
1568 file->f_version = inode_query_iversion(inode);
1569 }
1570
1571 while (ctx->pos < extra_size) {
1572 if (ctx->pos == 0) {
1573 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1574 goto out;
1575 ctx->pos = dotdot_offset;
1576 continue;
1577 }
1578
1579 if (ctx->pos == dotdot_offset) {
1580 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1581 goto out;
1582 ctx->pos = dotdot_size;
1583 continue;
1584 }
1585
1586 de = (struct ext4_dir_entry_2 *)
1587 (dir_buf + ctx->pos - extra_offset);
1588 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1589 extra_size, ctx->pos))
1590 goto out;
1591 if (le32_to_cpu(de->inode)) {
1592 if (!dir_emit(ctx, de->name, de->name_len,
1593 le32_to_cpu(de->inode),
1594 get_dtype(sb, de->file_type)))
1595 goto out;
1596 }
1597 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1598 }
1599 out:
1600 kfree(dir_buf);
1601 brelse(iloc.bh);
1602 return ret;
1603 }
1604
ext4_read_inline_link(struct inode * inode)1605 void *ext4_read_inline_link(struct inode *inode)
1606 {
1607 struct ext4_iloc iloc;
1608 int ret, inline_size;
1609 void *link;
1610
1611 ret = ext4_get_inode_loc(inode, &iloc);
1612 if (ret)
1613 return ERR_PTR(ret);
1614
1615 ret = -ENOMEM;
1616 inline_size = ext4_get_inline_size(inode);
1617 link = kmalloc(inline_size + 1, GFP_NOFS);
1618 if (!link)
1619 goto out;
1620
1621 ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1622 if (ret < 0) {
1623 kfree(link);
1624 goto out;
1625 }
1626 nd_terminate_link(link, inode->i_size, ret);
1627 out:
1628 if (ret < 0)
1629 link = ERR_PTR(ret);
1630 brelse(iloc.bh);
1631 return link;
1632 }
1633
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1634 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1635 struct ext4_dir_entry_2 **parent_de,
1636 int *retval)
1637 {
1638 struct ext4_iloc iloc;
1639
1640 *retval = ext4_get_inode_loc(inode, &iloc);
1641 if (*retval)
1642 return NULL;
1643
1644 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1645
1646 return iloc.bh;
1647 }
1648
1649 /*
1650 * Try to create the inline data for the new dir.
1651 * If it succeeds, return 0, otherwise return the error.
1652 * In case of ENOSPC, the caller should create the normal disk layout dir.
1653 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1654 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1655 struct inode *inode)
1656 {
1657 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1658 struct ext4_iloc iloc;
1659 struct ext4_dir_entry_2 *de;
1660
1661 ret = ext4_get_inode_loc(inode, &iloc);
1662 if (ret)
1663 return ret;
1664
1665 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1666 if (ret)
1667 goto out;
1668
1669 /*
1670 * For inline dir, we only save the inode information for the ".."
1671 * and create a fake dentry to cover the left space.
1672 */
1673 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1674 de->inode = cpu_to_le32(parent->i_ino);
1675 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1676 de->inode = 0;
1677 de->rec_len = ext4_rec_len_to_disk(
1678 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1679 inline_size);
1680 set_nlink(inode, 2);
1681 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1682 out:
1683 brelse(iloc.bh);
1684 return ret;
1685 }
1686
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1687 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1688 struct ext4_filename *fname,
1689 struct ext4_dir_entry_2 **res_dir,
1690 int *has_inline_data)
1691 {
1692 int ret;
1693 struct ext4_iloc iloc;
1694 void *inline_start;
1695 int inline_size;
1696
1697 if (ext4_get_inode_loc(dir, &iloc))
1698 return NULL;
1699
1700 down_read(&EXT4_I(dir)->xattr_sem);
1701 if (!ext4_has_inline_data(dir)) {
1702 *has_inline_data = 0;
1703 goto out;
1704 }
1705
1706 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1707 EXT4_INLINE_DOTDOT_SIZE;
1708 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1709 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1710 dir, fname, 0, res_dir);
1711 if (ret == 1)
1712 goto out_find;
1713 if (ret < 0)
1714 goto out;
1715
1716 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1717 goto out;
1718
1719 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1720 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1721
1722 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1723 dir, fname, 0, res_dir);
1724 if (ret == 1)
1725 goto out_find;
1726
1727 out:
1728 brelse(iloc.bh);
1729 iloc.bh = NULL;
1730 out_find:
1731 up_read(&EXT4_I(dir)->xattr_sem);
1732 return iloc.bh;
1733 }
1734
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)1735 int ext4_delete_inline_entry(handle_t *handle,
1736 struct inode *dir,
1737 struct ext4_dir_entry_2 *de_del,
1738 struct buffer_head *bh,
1739 int *has_inline_data)
1740 {
1741 int err, inline_size, no_expand;
1742 struct ext4_iloc iloc;
1743 void *inline_start;
1744
1745 err = ext4_get_inode_loc(dir, &iloc);
1746 if (err)
1747 return err;
1748
1749 ext4_write_lock_xattr(dir, &no_expand);
1750 if (!ext4_has_inline_data(dir)) {
1751 *has_inline_data = 0;
1752 goto out;
1753 }
1754
1755 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1756 EXT4_MIN_INLINE_DATA_SIZE) {
1757 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1758 EXT4_INLINE_DOTDOT_SIZE;
1759 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1760 EXT4_INLINE_DOTDOT_SIZE;
1761 } else {
1762 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1763 inline_size = ext4_get_inline_size(dir) -
1764 EXT4_MIN_INLINE_DATA_SIZE;
1765 }
1766
1767 BUFFER_TRACE(bh, "get_write_access");
1768 err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1769 EXT4_JTR_NONE);
1770 if (err)
1771 goto out;
1772
1773 err = ext4_generic_delete_entry(dir, de_del, bh,
1774 inline_start, inline_size, 0);
1775 if (err)
1776 goto out;
1777
1778 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1779 out:
1780 ext4_write_unlock_xattr(dir, &no_expand);
1781 if (likely(err == 0))
1782 err = ext4_mark_inode_dirty(handle, dir);
1783 brelse(iloc.bh);
1784 if (err != -ENOENT)
1785 ext4_std_error(dir->i_sb, err);
1786 return err;
1787 }
1788
1789 /*
1790 * Get the inline dentry at offset.
1791 */
1792 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)1793 ext4_get_inline_entry(struct inode *inode,
1794 struct ext4_iloc *iloc,
1795 unsigned int offset,
1796 void **inline_start,
1797 int *inline_size)
1798 {
1799 void *inline_pos;
1800
1801 BUG_ON(offset > ext4_get_inline_size(inode));
1802
1803 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1804 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1805 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1806 } else {
1807 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1808 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1809 *inline_size = ext4_get_inline_size(inode) -
1810 EXT4_MIN_INLINE_DATA_SIZE;
1811 }
1812
1813 if (inline_start)
1814 *inline_start = inline_pos;
1815 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1816 }
1817
empty_inline_dir(struct inode * dir,int * has_inline_data)1818 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1819 {
1820 int err, inline_size;
1821 struct ext4_iloc iloc;
1822 size_t inline_len;
1823 void *inline_pos;
1824 unsigned int offset;
1825 struct ext4_dir_entry_2 *de;
1826 bool ret = false;
1827
1828 err = ext4_get_inode_loc(dir, &iloc);
1829 if (err) {
1830 EXT4_ERROR_INODE_ERR(dir, -err,
1831 "error %d getting inode %lu block",
1832 err, dir->i_ino);
1833 return false;
1834 }
1835
1836 down_read(&EXT4_I(dir)->xattr_sem);
1837 if (!ext4_has_inline_data(dir)) {
1838 *has_inline_data = 0;
1839 ret = true;
1840 goto out;
1841 }
1842
1843 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1844 if (!le32_to_cpu(de->inode)) {
1845 ext4_warning(dir->i_sb,
1846 "bad inline directory (dir #%lu) - no `..'",
1847 dir->i_ino);
1848 goto out;
1849 }
1850
1851 inline_len = ext4_get_inline_size(dir);
1852 offset = EXT4_INLINE_DOTDOT_SIZE;
1853 while (offset < inline_len) {
1854 de = ext4_get_inline_entry(dir, &iloc, offset,
1855 &inline_pos, &inline_size);
1856 if (ext4_check_dir_entry(dir, NULL, de,
1857 iloc.bh, inline_pos,
1858 inline_size, offset)) {
1859 ext4_warning(dir->i_sb,
1860 "bad inline directory (dir #%lu) - "
1861 "inode %u, rec_len %u, name_len %d"
1862 "inline size %d",
1863 dir->i_ino, le32_to_cpu(de->inode),
1864 le16_to_cpu(de->rec_len), de->name_len,
1865 inline_size);
1866 goto out;
1867 }
1868 if (le32_to_cpu(de->inode)) {
1869 goto out;
1870 }
1871 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1872 }
1873
1874 ret = true;
1875 out:
1876 up_read(&EXT4_I(dir)->xattr_sem);
1877 brelse(iloc.bh);
1878 return ret;
1879 }
1880
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1881 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1882 {
1883 int ret, no_expand;
1884
1885 ext4_write_lock_xattr(inode, &no_expand);
1886 ret = ext4_destroy_inline_data_nolock(handle, inode);
1887 ext4_write_unlock_xattr(inode, &no_expand);
1888
1889 return ret;
1890 }
1891
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1892 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1893 {
1894 __u64 addr;
1895 int error = -EAGAIN;
1896 struct ext4_iloc iloc;
1897
1898 down_read(&EXT4_I(inode)->xattr_sem);
1899 if (!ext4_has_inline_data(inode))
1900 goto out;
1901
1902 error = ext4_get_inode_loc(inode, &iloc);
1903 if (error)
1904 goto out;
1905
1906 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1907 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1908 addr += offsetof(struct ext4_inode, i_block);
1909
1910 brelse(iloc.bh);
1911
1912 iomap->addr = addr;
1913 iomap->offset = 0;
1914 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1915 i_size_read(inode));
1916 iomap->type = IOMAP_INLINE;
1917 iomap->flags = 0;
1918
1919 out:
1920 up_read(&EXT4_I(inode)->xattr_sem);
1921 return error;
1922 }
1923
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1924 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1925 {
1926 handle_t *handle;
1927 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1928 size_t i_size;
1929 void *value = NULL;
1930 struct ext4_xattr_ibody_find is = {
1931 .s = { .not_found = -ENODATA, },
1932 };
1933 struct ext4_xattr_info i = {
1934 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1935 .name = EXT4_XATTR_SYSTEM_DATA,
1936 };
1937
1938
1939 needed_blocks = ext4_writepage_trans_blocks(inode);
1940 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1941 if (IS_ERR(handle))
1942 return PTR_ERR(handle);
1943
1944 ext4_write_lock_xattr(inode, &no_expand);
1945 if (!ext4_has_inline_data(inode)) {
1946 ext4_write_unlock_xattr(inode, &no_expand);
1947 *has_inline = 0;
1948 ext4_journal_stop(handle);
1949 return 0;
1950 }
1951
1952 if ((err = ext4_orphan_add(handle, inode)) != 0)
1953 goto out;
1954
1955 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1956 goto out;
1957
1958 down_write(&EXT4_I(inode)->i_data_sem);
1959 i_size = inode->i_size;
1960 inline_size = ext4_get_inline_size(inode);
1961 EXT4_I(inode)->i_disksize = i_size;
1962
1963 if (i_size < inline_size) {
1964 /*
1965 * if there's inline data to truncate and this file was
1966 * converted to extents after that inline data was written,
1967 * the extent status cache must be cleared to avoid leaving
1968 * behind stale delayed allocated extent entries
1969 */
1970 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1971 retry:
1972 err = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1973 if (err == -ENOMEM) {
1974 memalloc_retry_wait(GFP_ATOMIC);
1975 goto retry;
1976 }
1977 if (err)
1978 goto out_error;
1979 }
1980
1981 /* Clear the content in the xattr space. */
1982 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1983 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1984 goto out_error;
1985
1986 BUG_ON(is.s.not_found);
1987
1988 value_len = le32_to_cpu(is.s.here->e_value_size);
1989 value = kmalloc(value_len, GFP_NOFS);
1990 if (!value) {
1991 err = -ENOMEM;
1992 goto out_error;
1993 }
1994
1995 err = ext4_xattr_ibody_get(inode, i.name_index,
1996 i.name, value, value_len);
1997 if (err <= 0)
1998 goto out_error;
1999
2000 i.value = value;
2001 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
2002 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
2003 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
2004 if (err)
2005 goto out_error;
2006 }
2007
2008 /* Clear the content within i_blocks. */
2009 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
2010 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2011 memset(p + i_size, 0,
2012 EXT4_MIN_INLINE_DATA_SIZE - i_size);
2013 }
2014
2015 EXT4_I(inode)->i_inline_size = i_size <
2016 EXT4_MIN_INLINE_DATA_SIZE ?
2017 EXT4_MIN_INLINE_DATA_SIZE : i_size;
2018 }
2019
2020 out_error:
2021 up_write(&EXT4_I(inode)->i_data_sem);
2022 out:
2023 brelse(is.iloc.bh);
2024 ext4_write_unlock_xattr(inode, &no_expand);
2025 kfree(value);
2026 if (inode->i_nlink)
2027 ext4_orphan_del(handle, inode);
2028
2029 if (err == 0) {
2030 inode->i_mtime = inode->i_ctime = current_time(inode);
2031 err = ext4_mark_inode_dirty(handle, inode);
2032 if (IS_SYNC(inode))
2033 ext4_handle_sync(handle);
2034 }
2035 ext4_journal_stop(handle);
2036 return err;
2037 }
2038
ext4_convert_inline_data(struct inode * inode)2039 int ext4_convert_inline_data(struct inode *inode)
2040 {
2041 int error, needed_blocks, no_expand;
2042 handle_t *handle;
2043 struct ext4_iloc iloc;
2044
2045 if (!ext4_has_inline_data(inode)) {
2046 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2047 return 0;
2048 } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2049 /*
2050 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2051 * cleared. This means we are in the middle of moving of
2052 * inline data to delay allocated block. Just force writeout
2053 * here to finish conversion.
2054 */
2055 error = filemap_flush(inode->i_mapping);
2056 if (error)
2057 return error;
2058 if (!ext4_has_inline_data(inode))
2059 return 0;
2060 }
2061
2062 needed_blocks = ext4_writepage_trans_blocks(inode);
2063
2064 iloc.bh = NULL;
2065 error = ext4_get_inode_loc(inode, &iloc);
2066 if (error)
2067 return error;
2068
2069 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2070 if (IS_ERR(handle)) {
2071 error = PTR_ERR(handle);
2072 goto out_free;
2073 }
2074
2075 ext4_write_lock_xattr(inode, &no_expand);
2076 if (ext4_has_inline_data(inode))
2077 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2078 ext4_write_unlock_xattr(inode, &no_expand);
2079 ext4_journal_stop(handle);
2080 out_free:
2081 brelse(iloc.bh);
2082 return error;
2083 }
2084