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 void *end;
37 int free, min_offs;
38
39 if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
40 return 0;
41
42 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
43 EXT4_GOOD_OLD_INODE_SIZE -
44 EXT4_I(inode)->i_extra_isize -
45 sizeof(struct ext4_xattr_ibody_header);
46
47 /*
48 * We need to subtract another sizeof(__u32) since an in-inode xattr
49 * needs an empty 4 bytes to indicate the gap between the xattr entry
50 * and the name/value pair.
51 */
52 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
53 return EXT4_XATTR_SIZE(min_offs -
54 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
55 EXT4_XATTR_ROUND - sizeof(__u32));
56
57 raw_inode = ext4_raw_inode(iloc);
58 header = IHDR(inode, raw_inode);
59 entry = IFIRST(header);
60 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
61
62 /* Compute min_offs. */
63 while (!IS_LAST_ENTRY(entry)) {
64 void *next = EXT4_XATTR_NEXT(entry);
65
66 if (next >= end) {
67 EXT4_ERROR_INODE(inode,
68 "corrupt xattr in inline inode");
69 return 0;
70 }
71 if (!entry->e_value_inum && entry->e_value_size) {
72 size_t offs = le16_to_cpu(entry->e_value_offs);
73 if (offs < min_offs)
74 min_offs = offs;
75 }
76 entry = next;
77 }
78 free = min_offs -
79 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
80
81 if (EXT4_I(inode)->i_inline_off) {
82 entry = (struct ext4_xattr_entry *)
83 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
84
85 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
86 goto out;
87 }
88
89 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
90
91 if (free > EXT4_XATTR_ROUND)
92 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
93 else
94 free = 0;
95
96 out:
97 return free;
98 }
99
100 /*
101 * Get the maximum size we now can store in an inode.
102 * If we can't find the space for a xattr entry, don't use the space
103 * of the extents since we have no space to indicate the inline data.
104 */
ext4_get_max_inline_size(struct inode * inode)105 int ext4_get_max_inline_size(struct inode *inode)
106 {
107 int error, max_inline_size;
108 struct ext4_iloc iloc;
109
110 if (EXT4_I(inode)->i_extra_isize == 0)
111 return 0;
112
113 error = ext4_get_inode_loc(inode, &iloc);
114 if (error) {
115 ext4_error_inode(inode, __func__, __LINE__, 0,
116 "can't get inode location %lu",
117 inode->i_ino);
118 return 0;
119 }
120
121 down_read(&EXT4_I(inode)->xattr_sem);
122 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
123 up_read(&EXT4_I(inode)->xattr_sem);
124
125 brelse(iloc.bh);
126
127 if (!max_inline_size)
128 return 0;
129
130 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
131 }
132
133 /*
134 * this function does not take xattr_sem, which is OK because it is
135 * currently only used in a code path coming form ext4_iget, before
136 * the new inode has been unlocked
137 */
ext4_find_inline_data_nolock(struct inode * inode)138 int ext4_find_inline_data_nolock(struct inode *inode)
139 {
140 struct ext4_xattr_ibody_find is = {
141 .s = { .not_found = -ENODATA, },
142 };
143 struct ext4_xattr_info i = {
144 .name_index = EXT4_XATTR_INDEX_SYSTEM,
145 .name = EXT4_XATTR_SYSTEM_DATA,
146 };
147 int error;
148
149 if (EXT4_I(inode)->i_extra_isize == 0)
150 return 0;
151
152 error = ext4_get_inode_loc(inode, &is.iloc);
153 if (error)
154 return error;
155
156 error = ext4_xattr_ibody_find(inode, &i, &is);
157 if (error)
158 goto out;
159
160 if (!is.s.not_found) {
161 if (is.s.here->e_value_inum) {
162 EXT4_ERROR_INODE(inode, "inline data xattr refers "
163 "to an external xattr inode");
164 error = -EFSCORRUPTED;
165 goto out;
166 }
167 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
168 (void *)ext4_raw_inode(&is.iloc));
169 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
170 le32_to_cpu(is.s.here->e_value_size);
171 }
172 out:
173 brelse(is.iloc.bh);
174 return error;
175 }
176
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)177 static int ext4_read_inline_data(struct inode *inode, void *buffer,
178 unsigned int len,
179 struct ext4_iloc *iloc)
180 {
181 struct ext4_xattr_entry *entry;
182 struct ext4_xattr_ibody_header *header;
183 int cp_len = 0;
184 struct ext4_inode *raw_inode;
185
186 if (!len)
187 return 0;
188
189 BUG_ON(len > EXT4_I(inode)->i_inline_size);
190
191 cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
192 len : EXT4_MIN_INLINE_DATA_SIZE;
193
194 raw_inode = ext4_raw_inode(iloc);
195 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
196
197 len -= cp_len;
198 buffer += cp_len;
199
200 if (!len)
201 goto out;
202
203 header = IHDR(inode, raw_inode);
204 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
205 EXT4_I(inode)->i_inline_off);
206 len = min_t(unsigned int, len,
207 (unsigned int)le32_to_cpu(entry->e_value_size));
208
209 memcpy(buffer,
210 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
211 cp_len += len;
212
213 out:
214 return cp_len;
215 }
216
217 /*
218 * write the buffer to the inline inode.
219 * If 'create' is set, we don't need to do the extra copy in the xattr
220 * value since it is already handled by ext4_xattr_ibody_set.
221 * That saves us one memcpy.
222 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)223 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
224 void *buffer, loff_t pos, unsigned int len)
225 {
226 struct ext4_xattr_entry *entry;
227 struct ext4_xattr_ibody_header *header;
228 struct ext4_inode *raw_inode;
229 int cp_len = 0;
230
231 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
232 return;
233
234 BUG_ON(!EXT4_I(inode)->i_inline_off);
235 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
236
237 raw_inode = ext4_raw_inode(iloc);
238 buffer += pos;
239
240 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
241 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
242 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
243 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
244
245 len -= cp_len;
246 buffer += cp_len;
247 pos += cp_len;
248 }
249
250 if (!len)
251 return;
252
253 pos -= EXT4_MIN_INLINE_DATA_SIZE;
254 header = IHDR(inode, raw_inode);
255 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
256 EXT4_I(inode)->i_inline_off);
257
258 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
259 buffer, len);
260 }
261
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)262 static int ext4_create_inline_data(handle_t *handle,
263 struct inode *inode, unsigned len)
264 {
265 int error;
266 void *value = NULL;
267 struct ext4_xattr_ibody_find is = {
268 .s = { .not_found = -ENODATA, },
269 };
270 struct ext4_xattr_info i = {
271 .name_index = EXT4_XATTR_INDEX_SYSTEM,
272 .name = EXT4_XATTR_SYSTEM_DATA,
273 };
274
275 error = ext4_get_inode_loc(inode, &is.iloc);
276 if (error)
277 return error;
278
279 BUFFER_TRACE(is.iloc.bh, "get_write_access");
280 error = ext4_journal_get_write_access(handle, is.iloc.bh);
281 if (error)
282 goto out;
283
284 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
285 value = EXT4_ZERO_XATTR_VALUE;
286 len -= EXT4_MIN_INLINE_DATA_SIZE;
287 } else {
288 value = "";
289 len = 0;
290 }
291
292 /* Insert the the xttr entry. */
293 i.value = value;
294 i.value_len = len;
295
296 error = ext4_xattr_ibody_find(inode, &i, &is);
297 if (error)
298 goto out;
299
300 BUG_ON(!is.s.not_found);
301
302 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
303 if (error) {
304 if (error == -ENOSPC)
305 ext4_clear_inode_state(inode,
306 EXT4_STATE_MAY_INLINE_DATA);
307 goto out;
308 }
309
310 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
311 0, EXT4_MIN_INLINE_DATA_SIZE);
312
313 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
314 (void *)ext4_raw_inode(&is.iloc));
315 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
316 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
317 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
318 get_bh(is.iloc.bh);
319 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
320
321 out:
322 brelse(is.iloc.bh);
323 return error;
324 }
325
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)326 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
327 unsigned int len)
328 {
329 int error;
330 void *value = NULL;
331 struct ext4_xattr_ibody_find is = {
332 .s = { .not_found = -ENODATA, },
333 };
334 struct ext4_xattr_info i = {
335 .name_index = EXT4_XATTR_INDEX_SYSTEM,
336 .name = EXT4_XATTR_SYSTEM_DATA,
337 };
338
339 /* If the old space is ok, write the data directly. */
340 if (len <= EXT4_I(inode)->i_inline_size)
341 return 0;
342
343 error = ext4_get_inode_loc(inode, &is.iloc);
344 if (error)
345 return error;
346
347 error = ext4_xattr_ibody_find(inode, &i, &is);
348 if (error)
349 goto out;
350
351 BUG_ON(is.s.not_found);
352
353 len -= EXT4_MIN_INLINE_DATA_SIZE;
354 value = kzalloc(len, GFP_NOFS);
355 if (!value) {
356 error = -ENOMEM;
357 goto out;
358 }
359
360 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
361 value, len);
362 if (error < 0)
363 goto out;
364
365 BUFFER_TRACE(is.iloc.bh, "get_write_access");
366 error = ext4_journal_get_write_access(handle, is.iloc.bh);
367 if (error)
368 goto out;
369
370 /* Update the xttr entry. */
371 i.value = value;
372 i.value_len = len;
373
374 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
375 if (error)
376 goto out;
377
378 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
379 (void *)ext4_raw_inode(&is.iloc));
380 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
381 le32_to_cpu(is.s.here->e_value_size);
382 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
383 get_bh(is.iloc.bh);
384 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
385
386 out:
387 kfree(value);
388 brelse(is.iloc.bh);
389 return error;
390 }
391
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)392 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
393 unsigned int len)
394 {
395 int ret, size, no_expand;
396 struct ext4_inode_info *ei = EXT4_I(inode);
397
398 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
399 return -ENOSPC;
400
401 size = ext4_get_max_inline_size(inode);
402 if (size < len)
403 return -ENOSPC;
404
405 ext4_write_lock_xattr(inode, &no_expand);
406
407 if (ei->i_inline_off)
408 ret = ext4_update_inline_data(handle, inode, len);
409 else
410 ret = ext4_create_inline_data(handle, inode, len);
411
412 ext4_write_unlock_xattr(inode, &no_expand);
413 return ret;
414 }
415
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)416 static int ext4_destroy_inline_data_nolock(handle_t *handle,
417 struct inode *inode)
418 {
419 struct ext4_inode_info *ei = EXT4_I(inode);
420 struct ext4_xattr_ibody_find is = {
421 .s = { .not_found = 0, },
422 };
423 struct ext4_xattr_info i = {
424 .name_index = EXT4_XATTR_INDEX_SYSTEM,
425 .name = EXT4_XATTR_SYSTEM_DATA,
426 .value = NULL,
427 .value_len = 0,
428 };
429 int error;
430
431 if (!ei->i_inline_off)
432 return 0;
433
434 error = ext4_get_inode_loc(inode, &is.iloc);
435 if (error)
436 return error;
437
438 error = ext4_xattr_ibody_find(inode, &i, &is);
439 if (error)
440 goto out;
441
442 BUFFER_TRACE(is.iloc.bh, "get_write_access");
443 error = ext4_journal_get_write_access(handle, is.iloc.bh);
444 if (error)
445 goto out;
446
447 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
448 if (error)
449 goto out;
450
451 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
452 0, EXT4_MIN_INLINE_DATA_SIZE);
453 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
454
455 if (ext4_has_feature_extents(inode->i_sb)) {
456 if (S_ISDIR(inode->i_mode) ||
457 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
458 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
459 ext4_ext_tree_init(handle, inode);
460 }
461 }
462 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
463
464 get_bh(is.iloc.bh);
465 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
466
467 EXT4_I(inode)->i_inline_off = 0;
468 EXT4_I(inode)->i_inline_size = 0;
469 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
470 out:
471 brelse(is.iloc.bh);
472 if (error == -ENODATA)
473 error = 0;
474 return error;
475 }
476
ext4_read_inline_page(struct inode * inode,struct page * page)477 static int ext4_read_inline_page(struct inode *inode, struct page *page)
478 {
479 void *kaddr;
480 int ret = 0;
481 size_t len;
482 struct ext4_iloc iloc;
483
484 BUG_ON(!PageLocked(page));
485 BUG_ON(!ext4_has_inline_data(inode));
486 BUG_ON(page->index);
487
488 if (!EXT4_I(inode)->i_inline_off) {
489 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
490 inode->i_ino);
491 goto out;
492 }
493
494 ret = ext4_get_inode_loc(inode, &iloc);
495 if (ret)
496 goto out;
497
498 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
499 kaddr = kmap_atomic(page);
500 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
501 flush_dcache_page(page);
502 kunmap_atomic(kaddr);
503 zero_user_segment(page, len, PAGE_SIZE);
504 SetPageUptodate(page);
505 brelse(iloc.bh);
506
507 out:
508 return ret;
509 }
510
ext4_readpage_inline(struct inode * inode,struct page * page)511 int ext4_readpage_inline(struct inode *inode, struct page *page)
512 {
513 int ret = 0;
514
515 down_read(&EXT4_I(inode)->xattr_sem);
516 if (!ext4_has_inline_data(inode)) {
517 up_read(&EXT4_I(inode)->xattr_sem);
518 return -EAGAIN;
519 }
520
521 if (trace_android_fs_dataread_start_enabled()) {
522 char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];
523
524 path = android_fstrace_get_pathname(pathbuf,
525 MAX_TRACE_PATHBUF_LEN,
526 inode);
527 trace_android_fs_dataread_start(inode, page_offset(page),
528 PAGE_SIZE, current->pid,
529 path, current->comm);
530 }
531
532 /*
533 * Current inline data can only exist in the 1st page,
534 * So for all the other pages, just set them uptodate.
535 */
536 if (!page->index)
537 ret = ext4_read_inline_page(inode, page);
538 else if (!PageUptodate(page)) {
539 zero_user_segment(page, 0, PAGE_SIZE);
540 SetPageUptodate(page);
541 }
542
543 trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);
544
545 up_read(&EXT4_I(inode)->xattr_sem);
546
547 unlock_page(page);
548 return ret >= 0 ? 0 : ret;
549 }
550
ext4_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags)551 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
552 struct inode *inode,
553 unsigned flags)
554 {
555 int ret, needed_blocks, no_expand;
556 handle_t *handle = NULL;
557 int retries = 0, sem_held = 0;
558 struct page *page = NULL;
559 unsigned from, to;
560 struct ext4_iloc iloc;
561
562 if (!ext4_has_inline_data(inode)) {
563 /*
564 * clear the flag so that no new write
565 * will trap here again.
566 */
567 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
568 return 0;
569 }
570
571 needed_blocks = ext4_writepage_trans_blocks(inode);
572
573 ret = ext4_get_inode_loc(inode, &iloc);
574 if (ret)
575 return ret;
576
577 retry:
578 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
579 if (IS_ERR(handle)) {
580 ret = PTR_ERR(handle);
581 handle = NULL;
582 goto out;
583 }
584
585 /* We cannot recurse into the filesystem as the transaction is already
586 * started */
587 flags |= AOP_FLAG_NOFS;
588
589 page = grab_cache_page_write_begin(mapping, 0, flags);
590 if (!page) {
591 ret = -ENOMEM;
592 goto out;
593 }
594
595 ext4_write_lock_xattr(inode, &no_expand);
596 sem_held = 1;
597 /* If some one has already done this for us, just exit. */
598 if (!ext4_has_inline_data(inode)) {
599 ret = 0;
600 goto out;
601 }
602
603 from = 0;
604 to = ext4_get_inline_size(inode);
605 if (!PageUptodate(page)) {
606 ret = ext4_read_inline_page(inode, page);
607 if (ret < 0)
608 goto out;
609 }
610
611 ret = ext4_destroy_inline_data_nolock(handle, inode);
612 if (ret)
613 goto out;
614
615 if (ext4_should_dioread_nolock(inode)) {
616 ret = __block_write_begin(page, from, to,
617 ext4_get_block_unwritten);
618 } else
619 ret = __block_write_begin(page, from, to, ext4_get_block);
620
621 if (!ret && ext4_should_journal_data(inode)) {
622 ret = ext4_walk_page_buffers(handle, page_buffers(page),
623 from, to, NULL,
624 do_journal_get_write_access);
625 }
626
627 if (ret) {
628 unlock_page(page);
629 put_page(page);
630 page = NULL;
631 ext4_orphan_add(handle, inode);
632 ext4_write_unlock_xattr(inode, &no_expand);
633 sem_held = 0;
634 ext4_journal_stop(handle);
635 handle = NULL;
636 ext4_truncate_failed_write(inode);
637 /*
638 * If truncate failed early the inode might
639 * still be on the orphan list; we need to
640 * make sure the inode is removed from the
641 * orphan list in that case.
642 */
643 if (inode->i_nlink)
644 ext4_orphan_del(NULL, inode);
645 }
646
647 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
648 goto retry;
649
650 if (page)
651 block_commit_write(page, from, to);
652 out:
653 if (page) {
654 unlock_page(page);
655 put_page(page);
656 }
657 if (sem_held)
658 ext4_write_unlock_xattr(inode, &no_expand);
659 if (handle)
660 ext4_journal_stop(handle);
661 brelse(iloc.bh);
662 return ret;
663 }
664
665 /*
666 * Try to write data in the inode.
667 * If the inode has inline data, check whether the new write can be
668 * in the inode also. If not, create the page the handle, move the data
669 * to the page make it update and let the later codes create extent for it.
670 */
ext4_try_to_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,unsigned flags,struct page ** pagep)671 int ext4_try_to_write_inline_data(struct address_space *mapping,
672 struct inode *inode,
673 loff_t pos, unsigned len,
674 unsigned flags,
675 struct page **pagep)
676 {
677 int ret;
678 handle_t *handle;
679 struct page *page;
680 struct ext4_iloc iloc;
681
682 if (pos + len > ext4_get_max_inline_size(inode))
683 goto convert;
684
685 ret = ext4_get_inode_loc(inode, &iloc);
686 if (ret)
687 return ret;
688
689 /*
690 * The possible write could happen in the inode,
691 * so try to reserve the space in inode first.
692 */
693 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
694 if (IS_ERR(handle)) {
695 ret = PTR_ERR(handle);
696 handle = NULL;
697 goto out;
698 }
699
700 ret = ext4_prepare_inline_data(handle, inode, pos + len);
701 if (ret && ret != -ENOSPC)
702 goto out;
703
704 /* We don't have space in inline inode, so convert it to extent. */
705 if (ret == -ENOSPC) {
706 ext4_journal_stop(handle);
707 brelse(iloc.bh);
708 goto convert;
709 }
710
711 ret = ext4_journal_get_write_access(handle, iloc.bh);
712 if (ret)
713 goto out;
714
715 flags |= AOP_FLAG_NOFS;
716
717 page = grab_cache_page_write_begin(mapping, 0, flags);
718 if (!page) {
719 ret = -ENOMEM;
720 goto out;
721 }
722
723 *pagep = page;
724 down_read(&EXT4_I(inode)->xattr_sem);
725 if (!ext4_has_inline_data(inode)) {
726 ret = 0;
727 unlock_page(page);
728 put_page(page);
729 goto out_up_read;
730 }
731
732 if (!PageUptodate(page)) {
733 ret = ext4_read_inline_page(inode, page);
734 if (ret < 0) {
735 unlock_page(page);
736 put_page(page);
737 goto out_up_read;
738 }
739 }
740
741 ret = 1;
742 handle = NULL;
743 out_up_read:
744 up_read(&EXT4_I(inode)->xattr_sem);
745 out:
746 if (handle && (ret != 1))
747 ext4_journal_stop(handle);
748 brelse(iloc.bh);
749 return ret;
750 convert:
751 return ext4_convert_inline_data_to_extent(mapping,
752 inode, flags);
753 }
754
ext4_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)755 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
756 unsigned copied, struct page *page)
757 {
758 int ret, no_expand;
759 void *kaddr;
760 struct ext4_iloc iloc;
761
762 if (unlikely(copied < len) && !PageUptodate(page))
763 return 0;
764
765 ret = ext4_get_inode_loc(inode, &iloc);
766 if (ret) {
767 ext4_std_error(inode->i_sb, ret);
768 return ret;
769 }
770
771 ext4_write_lock_xattr(inode, &no_expand);
772 BUG_ON(!ext4_has_inline_data(inode));
773
774 /*
775 * ei->i_inline_off may have changed since ext4_write_begin()
776 * called ext4_try_to_write_inline_data()
777 */
778 (void) ext4_find_inline_data_nolock(inode);
779
780 kaddr = kmap_atomic(page);
781 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
782 kunmap_atomic(kaddr);
783 SetPageUptodate(page);
784 /* clear page dirty so that writepages wouldn't work for us. */
785 ClearPageDirty(page);
786
787 ext4_write_unlock_xattr(inode, &no_expand);
788 brelse(iloc.bh);
789 mark_inode_dirty(inode);
790
791 return copied;
792 }
793
794 struct buffer_head *
ext4_journalled_write_inline_data(struct inode * inode,unsigned len,struct page * page)795 ext4_journalled_write_inline_data(struct inode *inode,
796 unsigned len,
797 struct page *page)
798 {
799 int ret, no_expand;
800 void *kaddr;
801 struct ext4_iloc iloc;
802
803 ret = ext4_get_inode_loc(inode, &iloc);
804 if (ret) {
805 ext4_std_error(inode->i_sb, ret);
806 return NULL;
807 }
808
809 ext4_write_lock_xattr(inode, &no_expand);
810 kaddr = kmap_atomic(page);
811 ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
812 kunmap_atomic(kaddr);
813 ext4_write_unlock_xattr(inode, &no_expand);
814
815 return iloc.bh;
816 }
817
818 /*
819 * Try to make the page cache and handle ready for the inline data case.
820 * We can call this function in 2 cases:
821 * 1. The inode is created and the first write exceeds inline size. We can
822 * clear the inode state safely.
823 * 2. The inode has inline data, then we need to read the data, make it
824 * update and dirty so that ext4_da_writepages can handle it. We don't
825 * need to start the journal since the file's metatdata isn't changed now.
826 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,unsigned flags,void ** fsdata)827 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
828 struct inode *inode,
829 unsigned flags,
830 void **fsdata)
831 {
832 int ret = 0, inline_size;
833 struct page *page;
834
835 page = grab_cache_page_write_begin(mapping, 0, flags);
836 if (!page)
837 return -ENOMEM;
838
839 down_read(&EXT4_I(inode)->xattr_sem);
840 if (!ext4_has_inline_data(inode)) {
841 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
842 goto out;
843 }
844
845 inline_size = ext4_get_inline_size(inode);
846
847 if (!PageUptodate(page)) {
848 ret = ext4_read_inline_page(inode, page);
849 if (ret < 0)
850 goto out;
851 }
852
853 ret = __block_write_begin(page, 0, inline_size,
854 ext4_da_get_block_prep);
855 if (ret) {
856 up_read(&EXT4_I(inode)->xattr_sem);
857 unlock_page(page);
858 put_page(page);
859 ext4_truncate_failed_write(inode);
860 return ret;
861 }
862
863 SetPageDirty(page);
864 SetPageUptodate(page);
865 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
866 *fsdata = (void *)CONVERT_INLINE_DATA;
867
868 out:
869 up_read(&EXT4_I(inode)->xattr_sem);
870 if (page) {
871 unlock_page(page);
872 put_page(page);
873 }
874 return ret;
875 }
876
877 /*
878 * Prepare the write for the inline data.
879 * If the the data can be written into the inode, we just read
880 * the page and make it uptodate, and start the journal.
881 * Otherwise read the page, makes it dirty so that it can be
882 * handle in writepages(the i_disksize update is left to the
883 * normal ext4_da_write_end).
884 */
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)885 int ext4_da_write_inline_data_begin(struct address_space *mapping,
886 struct inode *inode,
887 loff_t pos, unsigned len,
888 unsigned flags,
889 struct page **pagep,
890 void **fsdata)
891 {
892 int ret, inline_size;
893 handle_t *handle;
894 struct page *page;
895 struct ext4_iloc iloc;
896 int retries = 0;
897
898 ret = ext4_get_inode_loc(inode, &iloc);
899 if (ret)
900 return ret;
901
902 retry_journal:
903 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
904 if (IS_ERR(handle)) {
905 ret = PTR_ERR(handle);
906 goto out;
907 }
908
909 inline_size = ext4_get_max_inline_size(inode);
910
911 ret = -ENOSPC;
912 if (inline_size >= pos + len) {
913 ret = ext4_prepare_inline_data(handle, inode, pos + len);
914 if (ret && ret != -ENOSPC)
915 goto out_journal;
916 }
917
918 /*
919 * We cannot recurse into the filesystem as the transaction
920 * is already started.
921 */
922 flags |= AOP_FLAG_NOFS;
923
924 if (ret == -ENOSPC) {
925 ext4_journal_stop(handle);
926 ret = ext4_da_convert_inline_data_to_extent(mapping,
927 inode,
928 flags,
929 fsdata);
930 if (ret == -ENOSPC &&
931 ext4_should_retry_alloc(inode->i_sb, &retries))
932 goto retry_journal;
933 goto out;
934 }
935
936 page = grab_cache_page_write_begin(mapping, 0, flags);
937 if (!page) {
938 ret = -ENOMEM;
939 goto out_journal;
940 }
941
942 down_read(&EXT4_I(inode)->xattr_sem);
943 if (!ext4_has_inline_data(inode)) {
944 ret = 0;
945 goto out_release_page;
946 }
947
948 if (!PageUptodate(page)) {
949 ret = ext4_read_inline_page(inode, page);
950 if (ret < 0)
951 goto out_release_page;
952 }
953 ret = ext4_journal_get_write_access(handle, iloc.bh);
954 if (ret)
955 goto out_release_page;
956
957 up_read(&EXT4_I(inode)->xattr_sem);
958 *pagep = page;
959 brelse(iloc.bh);
960 return 1;
961 out_release_page:
962 up_read(&EXT4_I(inode)->xattr_sem);
963 unlock_page(page);
964 put_page(page);
965 out_journal:
966 ext4_journal_stop(handle);
967 out:
968 brelse(iloc.bh);
969 return ret;
970 }
971
ext4_da_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct page * page)972 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
973 unsigned len, unsigned copied,
974 struct page *page)
975 {
976 int ret;
977
978 ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
979 if (ret < 0) {
980 unlock_page(page);
981 put_page(page);
982 return ret;
983 }
984 copied = ret;
985
986 /*
987 * No need to use i_size_read() here, the i_size
988 * cannot change under us because we hold i_mutex.
989 *
990 * But it's important to update i_size while still holding page lock:
991 * page writeout could otherwise come in and zero beyond i_size.
992 */
993 if (pos+copied > inode->i_size)
994 i_size_write(inode, pos+copied);
995 unlock_page(page);
996 put_page(page);
997
998 /*
999 * Don't mark the inode dirty under page lock. First, it unnecessarily
1000 * makes the holding time of page lock longer. Second, it forces lock
1001 * ordering of page lock and transaction start for journaling
1002 * filesystems.
1003 */
1004 mark_inode_dirty(inode);
1005
1006 return copied;
1007 }
1008
1009 #ifdef INLINE_DIR_DEBUG
ext4_show_inline_dir(struct inode * dir,struct buffer_head * bh,void * inline_start,int inline_size)1010 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
1011 void *inline_start, int inline_size)
1012 {
1013 int offset;
1014 unsigned short de_len;
1015 struct ext4_dir_entry_2 *de = inline_start;
1016 void *dlimit = inline_start + inline_size;
1017
1018 trace_printk("inode %lu\n", dir->i_ino);
1019 offset = 0;
1020 while ((void *)de < dlimit) {
1021 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1022 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1023 offset, de_len, de->name_len, de->name,
1024 de->name_len, le32_to_cpu(de->inode));
1025 if (ext4_check_dir_entry(dir, NULL, de, bh,
1026 inline_start, inline_size, offset))
1027 BUG();
1028
1029 offset += de_len;
1030 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1031 }
1032 }
1033 #else
1034 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1035 #endif
1036
1037 /*
1038 * Add a new entry into a inline dir.
1039 * It will return -ENOSPC if no space is available, and -EIO
1040 * and -EEXIST if directory entry already exists.
1041 */
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)1042 static int ext4_add_dirent_to_inline(handle_t *handle,
1043 struct ext4_filename *fname,
1044 struct inode *dir,
1045 struct inode *inode,
1046 struct ext4_iloc *iloc,
1047 void *inline_start, int inline_size)
1048 {
1049 int err;
1050 struct ext4_dir_entry_2 *de;
1051
1052 err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1053 inline_size, fname, &de);
1054 if (err)
1055 return err;
1056
1057 BUFFER_TRACE(iloc->bh, "get_write_access");
1058 err = ext4_journal_get_write_access(handle, iloc->bh);
1059 if (err)
1060 return err;
1061 ext4_insert_dentry(dir, inode, de, inline_size, fname);
1062
1063 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1064
1065 /*
1066 * XXX shouldn't update any times until successful
1067 * completion of syscall, but too many callers depend
1068 * on this.
1069 *
1070 * XXX similarly, too many callers depend on
1071 * ext4_new_inode() setting the times, but error
1072 * recovery deletes the inode, so the worst that can
1073 * happen is that the times are slightly out of date
1074 * and/or different from the directory change time.
1075 */
1076 dir->i_mtime = dir->i_ctime = current_time(dir);
1077 ext4_update_dx_flag(dir);
1078 inode_inc_iversion(dir);
1079 return 1;
1080 }
1081
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)1082 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1083 struct ext4_iloc *iloc)
1084 {
1085 struct ext4_xattr_entry *entry;
1086 struct ext4_xattr_ibody_header *header;
1087
1088 BUG_ON(!EXT4_I(inode)->i_inline_off);
1089
1090 header = IHDR(inode, ext4_raw_inode(iloc));
1091 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1092 EXT4_I(inode)->i_inline_off);
1093
1094 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1095 }
1096
1097 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)1098 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1099 {
1100 struct ext4_dir_entry_2 *de, *prev_de;
1101 void *limit;
1102 int de_len;
1103
1104 de = (struct ext4_dir_entry_2 *)de_buf;
1105 if (old_size) {
1106 limit = de_buf + old_size;
1107 do {
1108 prev_de = de;
1109 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1110 de_buf += de_len;
1111 de = (struct ext4_dir_entry_2 *)de_buf;
1112 } while (de_buf < limit);
1113
1114 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1115 old_size, new_size);
1116 } else {
1117 /* this is just created, so create an empty entry. */
1118 de->inode = 0;
1119 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1120 }
1121 }
1122
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1123 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1124 struct ext4_iloc *iloc)
1125 {
1126 int ret;
1127 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1128 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1129
1130 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1131 return -ENOSPC;
1132
1133 ret = ext4_update_inline_data(handle, dir,
1134 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1135 if (ret)
1136 return ret;
1137
1138 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1139 EXT4_I(dir)->i_inline_size -
1140 EXT4_MIN_INLINE_DATA_SIZE);
1141 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1142 return 0;
1143 }
1144
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1145 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1146 struct ext4_iloc *iloc,
1147 void *buf, int inline_size)
1148 {
1149 int ret;
1150
1151 ret = ext4_create_inline_data(handle, inode, inline_size);
1152 if (ret) {
1153 ext4_msg(inode->i_sb, KERN_EMERG,
1154 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1155 inode->i_ino, ret);
1156 return;
1157 }
1158 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1159 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1160 }
1161
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1162 static int ext4_finish_convert_inline_dir(handle_t *handle,
1163 struct inode *inode,
1164 struct buffer_head *dir_block,
1165 void *buf,
1166 int inline_size)
1167 {
1168 int err, csum_size = 0, header_size = 0;
1169 struct ext4_dir_entry_2 *de;
1170 void *target = dir_block->b_data;
1171
1172 /*
1173 * First create "." and ".." and then copy the dir information
1174 * back to the block.
1175 */
1176 de = (struct ext4_dir_entry_2 *)target;
1177 de = ext4_init_dot_dotdot(inode, de,
1178 inode->i_sb->s_blocksize, csum_size,
1179 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1180 header_size = (void *)de - target;
1181
1182 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1183 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1184
1185 if (ext4_has_metadata_csum(inode->i_sb))
1186 csum_size = sizeof(struct ext4_dir_entry_tail);
1187
1188 inode->i_size = inode->i_sb->s_blocksize;
1189 i_size_write(inode, inode->i_sb->s_blocksize);
1190 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1191 ext4_update_final_de(dir_block->b_data,
1192 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1193 inode->i_sb->s_blocksize - csum_size);
1194
1195 if (csum_size)
1196 ext4_initialize_dirent_tail(dir_block,
1197 inode->i_sb->s_blocksize);
1198 set_buffer_uptodate(dir_block);
1199 unlock_buffer(dir_block);
1200 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1201 if (err)
1202 return err;
1203 set_buffer_verified(dir_block);
1204 return ext4_mark_inode_dirty(handle, inode);
1205 }
1206
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1207 static int ext4_convert_inline_data_nolock(handle_t *handle,
1208 struct inode *inode,
1209 struct ext4_iloc *iloc)
1210 {
1211 int error;
1212 void *buf = NULL;
1213 struct buffer_head *data_bh = NULL;
1214 struct ext4_map_blocks map;
1215 int inline_size;
1216
1217 inline_size = ext4_get_inline_size(inode);
1218 buf = kmalloc(inline_size, GFP_NOFS);
1219 if (!buf) {
1220 error = -ENOMEM;
1221 goto out;
1222 }
1223
1224 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1225 if (error < 0)
1226 goto out;
1227
1228 /*
1229 * Make sure the inline directory entries pass checks before we try to
1230 * convert them, so that we avoid touching stuff that needs fsck.
1231 */
1232 if (S_ISDIR(inode->i_mode)) {
1233 error = ext4_check_all_de(inode, iloc->bh,
1234 buf + EXT4_INLINE_DOTDOT_SIZE,
1235 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1236 if (error)
1237 goto out;
1238 }
1239
1240 error = ext4_destroy_inline_data_nolock(handle, inode);
1241 if (error)
1242 goto out;
1243
1244 map.m_lblk = 0;
1245 map.m_len = 1;
1246 map.m_flags = 0;
1247 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1248 if (error < 0)
1249 goto out_restore;
1250 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1251 error = -EIO;
1252 goto out_restore;
1253 }
1254
1255 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1256 if (!data_bh) {
1257 error = -ENOMEM;
1258 goto out_restore;
1259 }
1260
1261 lock_buffer(data_bh);
1262 error = ext4_journal_get_create_access(handle, data_bh);
1263 if (error) {
1264 unlock_buffer(data_bh);
1265 error = -EIO;
1266 goto out_restore;
1267 }
1268 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1269
1270 if (!S_ISDIR(inode->i_mode)) {
1271 memcpy(data_bh->b_data, buf, inline_size);
1272 set_buffer_uptodate(data_bh);
1273 unlock_buffer(data_bh);
1274 error = ext4_handle_dirty_metadata(handle,
1275 inode, data_bh);
1276 } else {
1277 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1278 buf, inline_size);
1279 }
1280
1281 out_restore:
1282 if (error)
1283 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1284
1285 out:
1286 brelse(data_bh);
1287 kfree(buf);
1288 return error;
1289 }
1290
1291 /*
1292 * Try to add the new entry to the inline data.
1293 * If succeeds, return 0. If not, extended the inline dir and copied data to
1294 * the new created block.
1295 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1296 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1297 struct inode *dir, struct inode *inode)
1298 {
1299 int ret, inline_size, no_expand;
1300 void *inline_start;
1301 struct ext4_iloc iloc;
1302
1303 ret = ext4_get_inode_loc(dir, &iloc);
1304 if (ret)
1305 return ret;
1306
1307 ext4_write_lock_xattr(dir, &no_expand);
1308 if (!ext4_has_inline_data(dir))
1309 goto out;
1310
1311 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1312 EXT4_INLINE_DOTDOT_SIZE;
1313 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1314
1315 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1316 inline_start, inline_size);
1317 if (ret != -ENOSPC)
1318 goto out;
1319
1320 /* check whether it can be inserted to inline xattr space. */
1321 inline_size = EXT4_I(dir)->i_inline_size -
1322 EXT4_MIN_INLINE_DATA_SIZE;
1323 if (!inline_size) {
1324 /* Try to use the xattr space.*/
1325 ret = ext4_update_inline_dir(handle, dir, &iloc);
1326 if (ret && ret != -ENOSPC)
1327 goto out;
1328
1329 inline_size = EXT4_I(dir)->i_inline_size -
1330 EXT4_MIN_INLINE_DATA_SIZE;
1331 }
1332
1333 if (inline_size) {
1334 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1335
1336 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1337 inode, &iloc, inline_start,
1338 inline_size);
1339
1340 if (ret != -ENOSPC)
1341 goto out;
1342 }
1343
1344 /*
1345 * The inline space is filled up, so create a new block for it.
1346 * As the extent tree will be created, we have to save the inline
1347 * dir first.
1348 */
1349 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1350
1351 out:
1352 ext4_write_unlock_xattr(dir, &no_expand);
1353 ext4_mark_inode_dirty(handle, dir);
1354 brelse(iloc.bh);
1355 return ret;
1356 }
1357
1358 /*
1359 * This function fills a red-black tree with information from an
1360 * inlined dir. It returns the number directory entries loaded
1361 * into the tree. If there is an error it is returned in err.
1362 */
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)1363 int ext4_inlinedir_to_tree(struct file *dir_file,
1364 struct inode *dir, ext4_lblk_t block,
1365 struct dx_hash_info *hinfo,
1366 __u32 start_hash, __u32 start_minor_hash,
1367 int *has_inline_data)
1368 {
1369 int err = 0, count = 0;
1370 unsigned int parent_ino;
1371 int pos;
1372 struct ext4_dir_entry_2 *de;
1373 struct inode *inode = file_inode(dir_file);
1374 int ret, inline_size = 0;
1375 struct ext4_iloc iloc;
1376 void *dir_buf = NULL;
1377 struct ext4_dir_entry_2 fake;
1378 struct fscrypt_str tmp_str;
1379
1380 ret = ext4_get_inode_loc(inode, &iloc);
1381 if (ret)
1382 return ret;
1383
1384 down_read(&EXT4_I(inode)->xattr_sem);
1385 if (!ext4_has_inline_data(inode)) {
1386 up_read(&EXT4_I(inode)->xattr_sem);
1387 *has_inline_data = 0;
1388 goto out;
1389 }
1390
1391 inline_size = ext4_get_inline_size(inode);
1392 dir_buf = kmalloc(inline_size, GFP_NOFS);
1393 if (!dir_buf) {
1394 ret = -ENOMEM;
1395 up_read(&EXT4_I(inode)->xattr_sem);
1396 goto out;
1397 }
1398
1399 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1400 up_read(&EXT4_I(inode)->xattr_sem);
1401 if (ret < 0)
1402 goto out;
1403
1404 pos = 0;
1405 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1406 while (pos < inline_size) {
1407 /*
1408 * As inlined dir doesn't store any information about '.' and
1409 * only the inode number of '..' is stored, we have to handle
1410 * them differently.
1411 */
1412 if (pos == 0) {
1413 fake.inode = cpu_to_le32(inode->i_ino);
1414 fake.name_len = 1;
1415 strcpy(fake.name, ".");
1416 fake.rec_len = ext4_rec_len_to_disk(
1417 ext4_dir_rec_len(fake.name_len, NULL),
1418 inline_size);
1419 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1420 de = &fake;
1421 pos = EXT4_INLINE_DOTDOT_OFFSET;
1422 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1423 fake.inode = cpu_to_le32(parent_ino);
1424 fake.name_len = 2;
1425 strcpy(fake.name, "..");
1426 fake.rec_len = ext4_rec_len_to_disk(
1427 ext4_dir_rec_len(fake.name_len, NULL),
1428 inline_size);
1429 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1430 de = &fake;
1431 pos = EXT4_INLINE_DOTDOT_SIZE;
1432 } else {
1433 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1434 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1435 if (ext4_check_dir_entry(inode, dir_file, de,
1436 iloc.bh, dir_buf,
1437 inline_size, pos)) {
1438 ret = count;
1439 goto out;
1440 }
1441 }
1442
1443 if (ext4_hash_in_dirent(dir)) {
1444 hinfo->hash = EXT4_DIRENT_HASH(de);
1445 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1446 } else {
1447 ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1448 }
1449 if ((hinfo->hash < start_hash) ||
1450 ((hinfo->hash == start_hash) &&
1451 (hinfo->minor_hash < start_minor_hash)))
1452 continue;
1453 if (de->inode == 0)
1454 continue;
1455 tmp_str.name = de->name;
1456 tmp_str.len = de->name_len;
1457 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1458 hinfo->minor_hash, de, &tmp_str);
1459 if (err) {
1460 ret = err;
1461 goto out;
1462 }
1463 count++;
1464 }
1465 ret = count;
1466 out:
1467 kfree(dir_buf);
1468 brelse(iloc.bh);
1469 return ret;
1470 }
1471
1472 /*
1473 * So this function is called when the volume is mkfsed with
1474 * dir_index disabled. In order to keep f_pos persistent
1475 * after we convert from an inlined dir to a blocked based,
1476 * we just pretend that we are a normal dir and return the
1477 * offset as if '.' and '..' really take place.
1478 *
1479 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1480 int ext4_read_inline_dir(struct file *file,
1481 struct dir_context *ctx,
1482 int *has_inline_data)
1483 {
1484 unsigned int offset, parent_ino;
1485 int i;
1486 struct ext4_dir_entry_2 *de;
1487 struct super_block *sb;
1488 struct inode *inode = file_inode(file);
1489 int ret, inline_size = 0;
1490 struct ext4_iloc iloc;
1491 void *dir_buf = NULL;
1492 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1493
1494 ret = ext4_get_inode_loc(inode, &iloc);
1495 if (ret)
1496 return ret;
1497
1498 down_read(&EXT4_I(inode)->xattr_sem);
1499 if (!ext4_has_inline_data(inode)) {
1500 up_read(&EXT4_I(inode)->xattr_sem);
1501 *has_inline_data = 0;
1502 goto out;
1503 }
1504
1505 inline_size = ext4_get_inline_size(inode);
1506 dir_buf = kmalloc(inline_size, GFP_NOFS);
1507 if (!dir_buf) {
1508 ret = -ENOMEM;
1509 up_read(&EXT4_I(inode)->xattr_sem);
1510 goto out;
1511 }
1512
1513 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1514 up_read(&EXT4_I(inode)->xattr_sem);
1515 if (ret < 0)
1516 goto out;
1517
1518 ret = 0;
1519 sb = inode->i_sb;
1520 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1521 offset = ctx->pos;
1522
1523 /*
1524 * dotdot_offset and dotdot_size is the real offset and
1525 * size for ".." and "." if the dir is block based while
1526 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1527 * So we will use extra_offset and extra_size to indicate them
1528 * during the inline dir iteration.
1529 */
1530 dotdot_offset = ext4_dir_rec_len(1, NULL);
1531 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1532 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1533 extra_size = extra_offset + inline_size;
1534
1535 /*
1536 * If the version has changed since the last call to
1537 * readdir(2), then we might be pointing to an invalid
1538 * dirent right now. Scan from the start of the inline
1539 * dir to make sure.
1540 */
1541 if (!inode_eq_iversion(inode, file->f_version)) {
1542 for (i = 0; i < extra_size && i < offset;) {
1543 /*
1544 * "." is with offset 0 and
1545 * ".." is dotdot_offset.
1546 */
1547 if (!i) {
1548 i = dotdot_offset;
1549 continue;
1550 } else if (i == dotdot_offset) {
1551 i = dotdot_size;
1552 continue;
1553 }
1554 /* for other entry, the real offset in
1555 * the buf has to be tuned accordingly.
1556 */
1557 de = (struct ext4_dir_entry_2 *)
1558 (dir_buf + i - extra_offset);
1559 /* It's too expensive to do a full
1560 * dirent test each time round this
1561 * loop, but we do have to test at
1562 * least that it is non-zero. A
1563 * failure will be detected in the
1564 * dirent test below. */
1565 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1566 < ext4_dir_rec_len(1, NULL))
1567 break;
1568 i += ext4_rec_len_from_disk(de->rec_len,
1569 extra_size);
1570 }
1571 offset = i;
1572 ctx->pos = offset;
1573 file->f_version = inode_query_iversion(inode);
1574 }
1575
1576 while (ctx->pos < extra_size) {
1577 if (ctx->pos == 0) {
1578 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1579 goto out;
1580 ctx->pos = dotdot_offset;
1581 continue;
1582 }
1583
1584 if (ctx->pos == dotdot_offset) {
1585 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1586 goto out;
1587 ctx->pos = dotdot_size;
1588 continue;
1589 }
1590
1591 de = (struct ext4_dir_entry_2 *)
1592 (dir_buf + ctx->pos - extra_offset);
1593 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1594 extra_size, ctx->pos))
1595 goto out;
1596 if (le32_to_cpu(de->inode)) {
1597 if (!dir_emit(ctx, de->name, de->name_len,
1598 le32_to_cpu(de->inode),
1599 get_dtype(sb, de->file_type)))
1600 goto out;
1601 }
1602 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1603 }
1604 out:
1605 kfree(dir_buf);
1606 brelse(iloc.bh);
1607 return ret;
1608 }
1609
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1610 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1611 struct ext4_dir_entry_2 **parent_de,
1612 int *retval)
1613 {
1614 struct ext4_iloc iloc;
1615
1616 *retval = ext4_get_inode_loc(inode, &iloc);
1617 if (*retval)
1618 return NULL;
1619
1620 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1621
1622 return iloc.bh;
1623 }
1624
1625 /*
1626 * Try to create the inline data for the new dir.
1627 * If it succeeds, return 0, otherwise return the error.
1628 * In case of ENOSPC, the caller should create the normal disk layout dir.
1629 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1630 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1631 struct inode *inode)
1632 {
1633 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1634 struct ext4_iloc iloc;
1635 struct ext4_dir_entry_2 *de;
1636
1637 ret = ext4_get_inode_loc(inode, &iloc);
1638 if (ret)
1639 return ret;
1640
1641 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1642 if (ret)
1643 goto out;
1644
1645 /*
1646 * For inline dir, we only save the inode information for the ".."
1647 * and create a fake dentry to cover the left space.
1648 */
1649 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1650 de->inode = cpu_to_le32(parent->i_ino);
1651 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1652 de->inode = 0;
1653 de->rec_len = ext4_rec_len_to_disk(
1654 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1655 inline_size);
1656 set_nlink(inode, 2);
1657 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1658 out:
1659 brelse(iloc.bh);
1660 return ret;
1661 }
1662
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1663 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1664 struct ext4_filename *fname,
1665 struct ext4_dir_entry_2 **res_dir,
1666 int *has_inline_data)
1667 {
1668 int ret;
1669 struct ext4_iloc iloc;
1670 void *inline_start;
1671 int inline_size;
1672
1673 if (ext4_get_inode_loc(dir, &iloc))
1674 return NULL;
1675
1676 down_read(&EXT4_I(dir)->xattr_sem);
1677 if (!ext4_has_inline_data(dir)) {
1678 *has_inline_data = 0;
1679 goto out;
1680 }
1681
1682 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1683 EXT4_INLINE_DOTDOT_SIZE;
1684 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1685 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1686 dir, fname, 0, res_dir);
1687 if (ret == 1)
1688 goto out_find;
1689 if (ret < 0)
1690 goto out;
1691
1692 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1693 goto out;
1694
1695 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1696 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1697
1698 ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1699 dir, fname, 0, res_dir);
1700 if (ret == 1)
1701 goto out_find;
1702
1703 out:
1704 brelse(iloc.bh);
1705 iloc.bh = NULL;
1706 out_find:
1707 up_read(&EXT4_I(dir)->xattr_sem);
1708 return iloc.bh;
1709 }
1710
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)1711 int ext4_delete_inline_entry(handle_t *handle,
1712 struct inode *dir,
1713 struct ext4_dir_entry_2 *de_del,
1714 struct buffer_head *bh,
1715 int *has_inline_data)
1716 {
1717 int err, inline_size, no_expand;
1718 struct ext4_iloc iloc;
1719 void *inline_start;
1720
1721 err = ext4_get_inode_loc(dir, &iloc);
1722 if (err)
1723 return err;
1724
1725 ext4_write_lock_xattr(dir, &no_expand);
1726 if (!ext4_has_inline_data(dir)) {
1727 *has_inline_data = 0;
1728 goto out;
1729 }
1730
1731 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1732 EXT4_MIN_INLINE_DATA_SIZE) {
1733 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1734 EXT4_INLINE_DOTDOT_SIZE;
1735 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1736 EXT4_INLINE_DOTDOT_SIZE;
1737 } else {
1738 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1739 inline_size = ext4_get_inline_size(dir) -
1740 EXT4_MIN_INLINE_DATA_SIZE;
1741 }
1742
1743 BUFFER_TRACE(bh, "get_write_access");
1744 err = ext4_journal_get_write_access(handle, bh);
1745 if (err)
1746 goto out;
1747
1748 err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1749 inline_start, inline_size, 0);
1750 if (err)
1751 goto out;
1752
1753 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1754 out:
1755 ext4_write_unlock_xattr(dir, &no_expand);
1756 if (likely(err == 0))
1757 err = ext4_mark_inode_dirty(handle, dir);
1758 brelse(iloc.bh);
1759 if (err != -ENOENT)
1760 ext4_std_error(dir->i_sb, err);
1761 return err;
1762 }
1763
1764 /*
1765 * Get the inline dentry at offset.
1766 */
1767 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)1768 ext4_get_inline_entry(struct inode *inode,
1769 struct ext4_iloc *iloc,
1770 unsigned int offset,
1771 void **inline_start,
1772 int *inline_size)
1773 {
1774 void *inline_pos;
1775
1776 BUG_ON(offset > ext4_get_inline_size(inode));
1777
1778 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1779 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1780 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1781 } else {
1782 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1783 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1784 *inline_size = ext4_get_inline_size(inode) -
1785 EXT4_MIN_INLINE_DATA_SIZE;
1786 }
1787
1788 if (inline_start)
1789 *inline_start = inline_pos;
1790 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1791 }
1792
empty_inline_dir(struct inode * dir,int * has_inline_data)1793 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1794 {
1795 int err, inline_size;
1796 struct ext4_iloc iloc;
1797 size_t inline_len;
1798 void *inline_pos;
1799 unsigned int offset;
1800 struct ext4_dir_entry_2 *de;
1801 bool ret = true;
1802
1803 err = ext4_get_inode_loc(dir, &iloc);
1804 if (err) {
1805 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1806 err, dir->i_ino);
1807 return true;
1808 }
1809
1810 down_read(&EXT4_I(dir)->xattr_sem);
1811 if (!ext4_has_inline_data(dir)) {
1812 *has_inline_data = 0;
1813 goto out;
1814 }
1815
1816 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1817 if (!le32_to_cpu(de->inode)) {
1818 ext4_warning(dir->i_sb,
1819 "bad inline directory (dir #%lu) - no `..'",
1820 dir->i_ino);
1821 ret = true;
1822 goto out;
1823 }
1824
1825 inline_len = ext4_get_inline_size(dir);
1826 offset = EXT4_INLINE_DOTDOT_SIZE;
1827 while (offset < inline_len) {
1828 de = ext4_get_inline_entry(dir, &iloc, offset,
1829 &inline_pos, &inline_size);
1830 if (ext4_check_dir_entry(dir, NULL, de,
1831 iloc.bh, inline_pos,
1832 inline_size, offset)) {
1833 ext4_warning(dir->i_sb,
1834 "bad inline directory (dir #%lu) - "
1835 "inode %u, rec_len %u, name_len %d"
1836 "inline size %d",
1837 dir->i_ino, le32_to_cpu(de->inode),
1838 le16_to_cpu(de->rec_len), de->name_len,
1839 inline_size);
1840 ret = true;
1841 goto out;
1842 }
1843 if (le32_to_cpu(de->inode)) {
1844 ret = false;
1845 goto out;
1846 }
1847 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1848 }
1849
1850 out:
1851 up_read(&EXT4_I(dir)->xattr_sem);
1852 brelse(iloc.bh);
1853 return ret;
1854 }
1855
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1856 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1857 {
1858 int ret, no_expand;
1859
1860 ext4_write_lock_xattr(inode, &no_expand);
1861 ret = ext4_destroy_inline_data_nolock(handle, inode);
1862 ext4_write_unlock_xattr(inode, &no_expand);
1863
1864 return ret;
1865 }
1866
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1867 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1868 {
1869 __u64 addr;
1870 int error = -EAGAIN;
1871 struct ext4_iloc iloc;
1872
1873 down_read(&EXT4_I(inode)->xattr_sem);
1874 if (!ext4_has_inline_data(inode))
1875 goto out;
1876
1877 error = ext4_get_inode_loc(inode, &iloc);
1878 if (error)
1879 goto out;
1880
1881 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1882 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1883 addr += offsetof(struct ext4_inode, i_block);
1884
1885 brelse(iloc.bh);
1886
1887 iomap->addr = addr;
1888 iomap->offset = 0;
1889 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1890 i_size_read(inode));
1891 iomap->type = IOMAP_INLINE;
1892 iomap->flags = 0;
1893
1894 out:
1895 up_read(&EXT4_I(inode)->xattr_sem);
1896 return error;
1897 }
1898
ext4_inline_data_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,int * has_inline,__u64 start,__u64 len)1899 int ext4_inline_data_fiemap(struct inode *inode,
1900 struct fiemap_extent_info *fieinfo,
1901 int *has_inline, __u64 start, __u64 len)
1902 {
1903 __u64 physical = 0;
1904 __u64 inline_len;
1905 __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1906 FIEMAP_EXTENT_LAST;
1907 int error = 0;
1908 struct ext4_iloc iloc;
1909
1910 down_read(&EXT4_I(inode)->xattr_sem);
1911 if (!ext4_has_inline_data(inode)) {
1912 *has_inline = 0;
1913 goto out;
1914 }
1915 inline_len = min_t(size_t, ext4_get_inline_size(inode),
1916 i_size_read(inode));
1917 if (start >= inline_len)
1918 goto out;
1919 if (start + len < inline_len)
1920 inline_len = start + len;
1921 inline_len -= start;
1922
1923 error = ext4_get_inode_loc(inode, &iloc);
1924 if (error)
1925 goto out;
1926
1927 physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1928 physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1929 physical += offsetof(struct ext4_inode, i_block);
1930
1931 brelse(iloc.bh);
1932 out:
1933 up_read(&EXT4_I(inode)->xattr_sem);
1934 if (physical)
1935 error = fiemap_fill_next_extent(fieinfo, start, physical,
1936 inline_len, flags);
1937 return (error < 0 ? error : 0);
1938 }
1939
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1940 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1941 {
1942 handle_t *handle;
1943 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1944 size_t i_size;
1945 void *value = NULL;
1946 struct ext4_xattr_ibody_find is = {
1947 .s = { .not_found = -ENODATA, },
1948 };
1949 struct ext4_xattr_info i = {
1950 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1951 .name = EXT4_XATTR_SYSTEM_DATA,
1952 };
1953
1954
1955 needed_blocks = ext4_writepage_trans_blocks(inode);
1956 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1957 if (IS_ERR(handle))
1958 return PTR_ERR(handle);
1959
1960 ext4_write_lock_xattr(inode, &no_expand);
1961 if (!ext4_has_inline_data(inode)) {
1962 ext4_write_unlock_xattr(inode, &no_expand);
1963 *has_inline = 0;
1964 ext4_journal_stop(handle);
1965 return 0;
1966 }
1967
1968 if ((err = ext4_orphan_add(handle, inode)) != 0)
1969 goto out;
1970
1971 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1972 goto out;
1973
1974 down_write(&EXT4_I(inode)->i_data_sem);
1975 i_size = inode->i_size;
1976 inline_size = ext4_get_inline_size(inode);
1977 EXT4_I(inode)->i_disksize = i_size;
1978
1979 if (i_size < inline_size) {
1980 /* Clear the content in the xattr space. */
1981 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1982 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1983 goto out_error;
1984
1985 BUG_ON(is.s.not_found);
1986
1987 value_len = le32_to_cpu(is.s.here->e_value_size);
1988 value = kmalloc(value_len, GFP_NOFS);
1989 if (!value) {
1990 err = -ENOMEM;
1991 goto out_error;
1992 }
1993
1994 err = ext4_xattr_ibody_get(inode, i.name_index,
1995 i.name, value, value_len);
1996 if (err <= 0)
1997 goto out_error;
1998
1999 i.value = value;
2000 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
2001 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
2002 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
2003 if (err)
2004 goto out_error;
2005 }
2006
2007 /* Clear the content within i_blocks. */
2008 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
2009 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2010 memset(p + i_size, 0,
2011 EXT4_MIN_INLINE_DATA_SIZE - i_size);
2012 }
2013
2014 EXT4_I(inode)->i_inline_size = i_size <
2015 EXT4_MIN_INLINE_DATA_SIZE ?
2016 EXT4_MIN_INLINE_DATA_SIZE : i_size;
2017 }
2018
2019 out_error:
2020 up_write(&EXT4_I(inode)->i_data_sem);
2021 out:
2022 brelse(is.iloc.bh);
2023 ext4_write_unlock_xattr(inode, &no_expand);
2024 kfree(value);
2025 if (inode->i_nlink)
2026 ext4_orphan_del(handle, inode);
2027
2028 if (err == 0) {
2029 inode->i_mtime = inode->i_ctime = current_time(inode);
2030 err = ext4_mark_inode_dirty(handle, inode);
2031 if (IS_SYNC(inode))
2032 ext4_handle_sync(handle);
2033 }
2034 ext4_journal_stop(handle);
2035 return err;
2036 }
2037
ext4_convert_inline_data(struct inode * inode)2038 int ext4_convert_inline_data(struct inode *inode)
2039 {
2040 int error, needed_blocks, no_expand;
2041 handle_t *handle;
2042 struct ext4_iloc iloc;
2043
2044 if (!ext4_has_inline_data(inode)) {
2045 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2046 return 0;
2047 } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2048 /*
2049 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2050 * cleared. This means we are in the middle of moving of
2051 * inline data to delay allocated block. Just force writeout
2052 * here to finish conversion.
2053 */
2054 error = filemap_flush(inode->i_mapping);
2055 if (error)
2056 return error;
2057 if (!ext4_has_inline_data(inode))
2058 return 0;
2059 }
2060
2061 needed_blocks = ext4_writepage_trans_blocks(inode);
2062
2063 iloc.bh = NULL;
2064 error = ext4_get_inode_loc(inode, &iloc);
2065 if (error)
2066 return error;
2067
2068 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2069 if (IS_ERR(handle)) {
2070 error = PTR_ERR(handle);
2071 goto out_free;
2072 }
2073
2074 ext4_write_lock_xattr(inode, &no_expand);
2075 if (ext4_has_inline_data(inode))
2076 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2077 ext4_write_unlock_xattr(inode, &no_expand);
2078 ext4_journal_stop(handle);
2079 out_free:
2080 brelse(iloc.bh);
2081 return error;
2082 }
2083