Line data Source code
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 :
23 : static int ext4_get_inline_size(struct inode *inode)
24 : {
25 0 : if (EXT4_I(inode)->i_inline_off)
26 0 : return EXT4_I(inode)->i_inline_size;
27 :
28 : return 0;
29 : }
30 :
31 0 : static int get_max_inline_xattr_value_size(struct inode *inode,
32 : struct ext4_iloc *iloc)
33 : {
34 0 : struct ext4_xattr_ibody_header *header;
35 0 : struct ext4_xattr_entry *entry;
36 0 : struct ext4_inode *raw_inode;
37 0 : void *end;
38 0 : int free, min_offs;
39 :
40 0 : if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
41 : return 0;
42 :
43 0 : min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
44 0 : EXT4_GOOD_OLD_INODE_SIZE -
45 0 : 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 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
54 0 : return EXT4_XATTR_SIZE(min_offs -
55 : EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
56 : EXT4_XATTR_ROUND - sizeof(__u32));
57 :
58 0 : raw_inode = ext4_raw_inode(iloc);
59 0 : header = IHDR(inode, raw_inode);
60 0 : entry = IFIRST(header);
61 0 : end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
62 :
63 : /* Compute min_offs. */
64 0 : while (!IS_LAST_ENTRY(entry)) {
65 0 : void *next = EXT4_XATTR_NEXT(entry);
66 :
67 0 : if (next >= end) {
68 0 : EXT4_ERROR_INODE(inode,
69 : "corrupt xattr in inline inode");
70 0 : return 0;
71 : }
72 0 : if (!entry->e_value_inum && entry->e_value_size) {
73 0 : size_t offs = le16_to_cpu(entry->e_value_offs);
74 0 : if (offs < min_offs)
75 0 : min_offs = offs;
76 : }
77 : entry = next;
78 : }
79 0 : free = min_offs -
80 0 : ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
81 :
82 0 : if (EXT4_I(inode)->i_inline_off) {
83 0 : entry = (struct ext4_xattr_entry *)
84 0 : ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
85 :
86 0 : free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
87 0 : goto out;
88 : }
89 :
90 0 : free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
91 :
92 0 : if (free > EXT4_XATTR_ROUND)
93 0 : 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 : */
106 0 : int ext4_get_max_inline_size(struct inode *inode)
107 : {
108 0 : int error, max_inline_size;
109 0 : struct ext4_iloc iloc;
110 :
111 0 : if (EXT4_I(inode)->i_extra_isize == 0)
112 : return 0;
113 :
114 0 : error = ext4_get_inode_loc(inode, &iloc);
115 0 : if (error) {
116 0 : ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
117 : "can't get inode location %lu",
118 : inode->i_ino);
119 0 : return 0;
120 : }
121 :
122 0 : down_read(&EXT4_I(inode)->xattr_sem);
123 0 : max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
124 0 : up_read(&EXT4_I(inode)->xattr_sem);
125 :
126 0 : brelse(iloc.bh);
127 :
128 0 : if (!max_inline_size)
129 : return 0;
130 :
131 0 : 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 : */
139 0 : int ext4_find_inline_data_nolock(struct inode *inode)
140 : {
141 0 : struct ext4_xattr_ibody_find is = {
142 : .s = { .not_found = -ENODATA, },
143 : };
144 0 : struct ext4_xattr_info i = {
145 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
146 : .name = EXT4_XATTR_SYSTEM_DATA,
147 : };
148 0 : int error;
149 :
150 0 : if (EXT4_I(inode)->i_extra_isize == 0)
151 : return 0;
152 :
153 0 : error = ext4_get_inode_loc(inode, &is.iloc);
154 0 : if (error)
155 : return error;
156 :
157 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
158 0 : if (error)
159 0 : goto out;
160 :
161 0 : if (!is.s.not_found) {
162 0 : if (is.s.here->e_value_inum) {
163 0 : EXT4_ERROR_INODE(inode, "inline data xattr refers "
164 : "to an external xattr inode");
165 0 : error = -EFSCORRUPTED;
166 0 : goto out;
167 : }
168 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
169 : (void *)ext4_raw_inode(&is.iloc));
170 0 : EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
171 0 : le32_to_cpu(is.s.here->e_value_size);
172 : }
173 0 : out:
174 0 : brelse(is.iloc.bh);
175 : return error;
176 : }
177 :
178 0 : static int ext4_read_inline_data(struct inode *inode, void *buffer,
179 : unsigned int len,
180 : struct ext4_iloc *iloc)
181 : {
182 0 : struct ext4_xattr_entry *entry;
183 0 : struct ext4_xattr_ibody_header *header;
184 0 : int cp_len = 0;
185 0 : struct ext4_inode *raw_inode;
186 :
187 0 : if (!len)
188 : return 0;
189 :
190 0 : BUG_ON(len > EXT4_I(inode)->i_inline_size);
191 :
192 0 : cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
193 :
194 0 : raw_inode = ext4_raw_inode(iloc);
195 0 : memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
196 :
197 0 : len -= cp_len;
198 0 : buffer += cp_len;
199 :
200 0 : if (!len)
201 0 : goto out;
202 :
203 0 : header = IHDR(inode, raw_inode);
204 0 : entry = (struct ext4_xattr_entry *)((void *)raw_inode +
205 0 : EXT4_I(inode)->i_inline_off);
206 0 : len = min_t(unsigned int, len,
207 : (unsigned int)le32_to_cpu(entry->e_value_size));
208 :
209 0 : memcpy(buffer,
210 : (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
211 0 : 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 : */
223 0 : static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
224 : void *buffer, loff_t pos, unsigned int len)
225 : {
226 0 : struct ext4_xattr_entry *entry;
227 0 : struct ext4_xattr_ibody_header *header;
228 0 : struct ext4_inode *raw_inode;
229 0 : int cp_len = 0;
230 :
231 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
232 : return;
233 :
234 0 : BUG_ON(!EXT4_I(inode)->i_inline_off);
235 0 : BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
236 :
237 0 : raw_inode = ext4_raw_inode(iloc);
238 0 : buffer += pos;
239 :
240 0 : if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
241 0 : cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
242 0 : EXT4_MIN_INLINE_DATA_SIZE - pos : len;
243 0 : memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
244 :
245 0 : len -= cp_len;
246 0 : buffer += cp_len;
247 0 : pos += cp_len;
248 : }
249 :
250 0 : if (!len)
251 : return;
252 :
253 0 : pos -= EXT4_MIN_INLINE_DATA_SIZE;
254 0 : header = IHDR(inode, raw_inode);
255 0 : entry = (struct ext4_xattr_entry *)((void *)raw_inode +
256 0 : EXT4_I(inode)->i_inline_off);
257 :
258 0 : memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
259 : buffer, len);
260 : }
261 :
262 0 : static int ext4_create_inline_data(handle_t *handle,
263 : struct inode *inode, unsigned len)
264 : {
265 0 : int error;
266 0 : void *value = NULL;
267 0 : struct ext4_xattr_ibody_find is = {
268 : .s = { .not_found = -ENODATA, },
269 : };
270 0 : struct ext4_xattr_info i = {
271 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
272 : .name = EXT4_XATTR_SYSTEM_DATA,
273 : };
274 :
275 0 : error = ext4_get_inode_loc(inode, &is.iloc);
276 0 : if (error)
277 : return error;
278 :
279 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
280 0 : error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
281 : EXT4_JTR_NONE);
282 0 : if (error)
283 0 : goto out;
284 :
285 0 : if (len > EXT4_MIN_INLINE_DATA_SIZE) {
286 0 : value = EXT4_ZERO_XATTR_VALUE;
287 0 : len -= EXT4_MIN_INLINE_DATA_SIZE;
288 : } else {
289 : value = "";
290 : len = 0;
291 : }
292 :
293 : /* Insert the xttr entry. */
294 0 : i.value = value;
295 0 : i.value_len = len;
296 :
297 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
298 0 : if (error)
299 0 : goto out;
300 :
301 0 : BUG_ON(!is.s.not_found);
302 :
303 0 : error = ext4_xattr_ibody_set(handle, inode, &i, &is);
304 0 : if (error) {
305 0 : if (error == -ENOSPC)
306 0 : ext4_clear_inode_state(inode,
307 : EXT4_STATE_MAY_INLINE_DATA);
308 0 : goto out;
309 : }
310 :
311 0 : memset((void *)ext4_raw_inode(&is.iloc)->i_block,
312 : 0, EXT4_MIN_INLINE_DATA_SIZE);
313 :
314 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
315 : (void *)ext4_raw_inode(&is.iloc));
316 0 : EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
317 0 : ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
318 0 : ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
319 0 : get_bh(is.iloc.bh);
320 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
321 :
322 0 : out:
323 0 : brelse(is.iloc.bh);
324 : return error;
325 : }
326 :
327 0 : static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
328 : unsigned int len)
329 : {
330 0 : int error;
331 0 : void *value = NULL;
332 0 : struct ext4_xattr_ibody_find is = {
333 : .s = { .not_found = -ENODATA, },
334 : };
335 0 : struct ext4_xattr_info i = {
336 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
337 : .name = EXT4_XATTR_SYSTEM_DATA,
338 : };
339 :
340 : /* If the old space is ok, write the data directly. */
341 0 : if (len <= EXT4_I(inode)->i_inline_size)
342 : return 0;
343 :
344 0 : error = ext4_get_inode_loc(inode, &is.iloc);
345 0 : if (error)
346 : return error;
347 :
348 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
349 0 : if (error)
350 0 : goto out;
351 :
352 0 : BUG_ON(is.s.not_found);
353 :
354 0 : len -= EXT4_MIN_INLINE_DATA_SIZE;
355 0 : value = kzalloc(len, GFP_NOFS);
356 0 : if (!value) {
357 0 : error = -ENOMEM;
358 0 : goto out;
359 : }
360 :
361 0 : error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
362 : value, len);
363 0 : if (error < 0)
364 0 : goto out;
365 :
366 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
367 0 : error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
368 : EXT4_JTR_NONE);
369 0 : if (error)
370 0 : goto out;
371 :
372 : /* Update the xattr entry. */
373 0 : i.value = value;
374 0 : i.value_len = len;
375 :
376 0 : error = ext4_xattr_ibody_set(handle, inode, &i, &is);
377 0 : if (error)
378 0 : goto out;
379 :
380 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
381 : (void *)ext4_raw_inode(&is.iloc));
382 0 : EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
383 0 : le32_to_cpu(is.s.here->e_value_size);
384 0 : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
385 0 : get_bh(is.iloc.bh);
386 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
387 :
388 0 : out:
389 0 : kfree(value);
390 0 : brelse(is.iloc.bh);
391 : return error;
392 : }
393 :
394 0 : static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
395 : unsigned int len)
396 : {
397 0 : int ret, size, no_expand;
398 0 : struct ext4_inode_info *ei = EXT4_I(inode);
399 :
400 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
401 : return -ENOSPC;
402 :
403 0 : size = ext4_get_max_inline_size(inode);
404 0 : if (size < len)
405 : return -ENOSPC;
406 :
407 0 : ext4_write_lock_xattr(inode, &no_expand);
408 :
409 0 : if (ei->i_inline_off)
410 0 : ret = ext4_update_inline_data(handle, inode, len);
411 : else
412 0 : ret = ext4_create_inline_data(handle, inode, len);
413 :
414 0 : ext4_write_unlock_xattr(inode, &no_expand);
415 0 : return ret;
416 : }
417 :
418 0 : static int ext4_destroy_inline_data_nolock(handle_t *handle,
419 : struct inode *inode)
420 : {
421 0 : struct ext4_inode_info *ei = EXT4_I(inode);
422 0 : struct ext4_xattr_ibody_find is = {
423 : .s = { .not_found = 0, },
424 : };
425 0 : struct ext4_xattr_info i = {
426 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
427 : .name = EXT4_XATTR_SYSTEM_DATA,
428 : .value = NULL,
429 : .value_len = 0,
430 : };
431 0 : int error;
432 :
433 0 : if (!ei->i_inline_off)
434 : return 0;
435 :
436 0 : error = ext4_get_inode_loc(inode, &is.iloc);
437 0 : if (error)
438 : return error;
439 :
440 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
441 0 : if (error)
442 0 : goto out;
443 :
444 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
445 0 : error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
446 : EXT4_JTR_NONE);
447 0 : if (error)
448 0 : goto out;
449 :
450 0 : error = ext4_xattr_ibody_set(handle, inode, &i, &is);
451 0 : if (error)
452 0 : goto out;
453 :
454 0 : memset((void *)ext4_raw_inode(&is.iloc)->i_block,
455 : 0, EXT4_MIN_INLINE_DATA_SIZE);
456 0 : memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
457 :
458 0 : if (ext4_has_feature_extents(inode->i_sb)) {
459 0 : if (S_ISDIR(inode->i_mode) ||
460 0 : S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
461 0 : ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
462 0 : ext4_ext_tree_init(handle, inode);
463 : }
464 : }
465 0 : ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
466 :
467 0 : get_bh(is.iloc.bh);
468 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
469 :
470 0 : EXT4_I(inode)->i_inline_off = 0;
471 0 : EXT4_I(inode)->i_inline_size = 0;
472 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
473 0 : out:
474 0 : brelse(is.iloc.bh);
475 0 : if (error == -ENODATA)
476 0 : error = 0;
477 : return error;
478 : }
479 :
480 0 : static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
481 : {
482 0 : void *kaddr;
483 0 : int ret = 0;
484 0 : size_t len;
485 0 : struct ext4_iloc iloc;
486 :
487 0 : BUG_ON(!folio_test_locked(folio));
488 0 : BUG_ON(!ext4_has_inline_data(inode));
489 0 : BUG_ON(folio->index);
490 :
491 0 : if (!EXT4_I(inode)->i_inline_off) {
492 0 : ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
493 : inode->i_ino);
494 0 : goto out;
495 : }
496 :
497 0 : ret = ext4_get_inode_loc(inode, &iloc);
498 0 : if (ret)
499 0 : goto out;
500 :
501 0 : len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
502 0 : BUG_ON(len > PAGE_SIZE);
503 0 : kaddr = kmap_local_folio(folio, 0);
504 0 : ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
505 0 : flush_dcache_folio(folio);
506 0 : kunmap_local(kaddr);
507 0 : folio_zero_segment(folio, len, folio_size(folio));
508 0 : folio_mark_uptodate(folio);
509 0 : brelse(iloc.bh);
510 :
511 0 : out:
512 0 : return ret;
513 : }
514 :
515 0 : int ext4_readpage_inline(struct inode *inode, struct folio *folio)
516 : {
517 0 : int ret = 0;
518 :
519 0 : down_read(&EXT4_I(inode)->xattr_sem);
520 0 : if (!ext4_has_inline_data(inode)) {
521 0 : up_read(&EXT4_I(inode)->xattr_sem);
522 0 : 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 0 : if (!folio->index)
530 0 : ret = ext4_read_inline_folio(inode, folio);
531 0 : else if (!folio_test_uptodate(folio)) {
532 0 : folio_zero_segment(folio, 0, folio_size(folio));
533 0 : folio_mark_uptodate(folio);
534 : }
535 :
536 0 : up_read(&EXT4_I(inode)->xattr_sem);
537 :
538 0 : folio_unlock(folio);
539 0 : return ret >= 0 ? 0 : ret;
540 : }
541 :
542 0 : static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
543 : struct inode *inode)
544 : {
545 0 : int ret, needed_blocks, no_expand;
546 0 : handle_t *handle = NULL;
547 0 : int retries = 0, sem_held = 0;
548 0 : struct folio *folio = NULL;
549 0 : unsigned from, to;
550 0 : struct ext4_iloc iloc;
551 :
552 0 : if (!ext4_has_inline_data(inode)) {
553 : /*
554 : * clear the flag so that no new write
555 : * will trap here again.
556 : */
557 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
558 0 : return 0;
559 : }
560 :
561 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
562 :
563 0 : ret = ext4_get_inode_loc(inode, &iloc);
564 0 : if (ret)
565 : return ret;
566 :
567 0 : retry:
568 0 : handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
569 0 : if (IS_ERR(handle)) {
570 0 : ret = PTR_ERR(handle);
571 0 : handle = NULL;
572 0 : goto out;
573 : }
574 :
575 : /* We cannot recurse into the filesystem as the transaction is already
576 : * started */
577 0 : folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
578 : mapping_gfp_mask(mapping));
579 0 : if (IS_ERR(folio)) {
580 0 : ret = PTR_ERR(folio);
581 0 : goto out_nofolio;
582 : }
583 :
584 0 : ext4_write_lock_xattr(inode, &no_expand);
585 0 : sem_held = 1;
586 : /* If some one has already done this for us, just exit. */
587 0 : if (!ext4_has_inline_data(inode)) {
588 0 : ret = 0;
589 0 : goto out;
590 : }
591 :
592 0 : from = 0;
593 0 : to = ext4_get_inline_size(inode);
594 0 : if (!folio_test_uptodate(folio)) {
595 0 : ret = ext4_read_inline_folio(inode, folio);
596 0 : if (ret < 0)
597 0 : goto out;
598 : }
599 :
600 0 : ret = ext4_destroy_inline_data_nolock(handle, inode);
601 0 : if (ret)
602 0 : goto out;
603 :
604 0 : if (ext4_should_dioread_nolock(inode)) {
605 0 : ret = __block_write_begin(&folio->page, from, to,
606 : ext4_get_block_unwritten);
607 : } else
608 0 : ret = __block_write_begin(&folio->page, from, to, ext4_get_block);
609 :
610 0 : if (!ret && ext4_should_journal_data(inode)) {
611 0 : ret = ext4_walk_page_buffers(handle, inode,
612 : folio_buffers(folio), from, to,
613 : NULL, do_journal_get_write_access);
614 : }
615 :
616 0 : if (ret) {
617 0 : folio_unlock(folio);
618 0 : folio_put(folio);
619 0 : folio = NULL;
620 0 : ext4_orphan_add(handle, inode);
621 0 : ext4_write_unlock_xattr(inode, &no_expand);
622 0 : sem_held = 0;
623 0 : ext4_journal_stop(handle);
624 0 : handle = NULL;
625 0 : ext4_truncate_failed_write(inode);
626 : /*
627 : * If truncate failed early the inode might
628 : * still be on the orphan list; we need to
629 : * make sure the inode is removed from the
630 : * orphan list in that case.
631 : */
632 0 : if (inode->i_nlink)
633 0 : ext4_orphan_del(NULL, inode);
634 : }
635 :
636 0 : if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
637 0 : goto retry;
638 :
639 0 : if (folio)
640 0 : block_commit_write(&folio->page, from, to);
641 0 : out:
642 0 : if (folio) {
643 0 : folio_unlock(folio);
644 0 : folio_put(folio);
645 : }
646 0 : out_nofolio:
647 0 : if (sem_held)
648 0 : ext4_write_unlock_xattr(inode, &no_expand);
649 0 : if (handle)
650 0 : ext4_journal_stop(handle);
651 0 : brelse(iloc.bh);
652 : return ret;
653 : }
654 :
655 : /*
656 : * Try to write data in the inode.
657 : * If the inode has inline data, check whether the new write can be
658 : * in the inode also. If not, create the page the handle, move the data
659 : * to the page make it update and let the later codes create extent for it.
660 : */
661 0 : int ext4_try_to_write_inline_data(struct address_space *mapping,
662 : struct inode *inode,
663 : loff_t pos, unsigned len,
664 : struct page **pagep)
665 : {
666 0 : int ret;
667 0 : handle_t *handle;
668 0 : struct folio *folio;
669 0 : struct ext4_iloc iloc;
670 :
671 0 : if (pos + len > ext4_get_max_inline_size(inode))
672 0 : goto convert;
673 :
674 0 : ret = ext4_get_inode_loc(inode, &iloc);
675 0 : if (ret)
676 : return ret;
677 :
678 : /*
679 : * The possible write could happen in the inode,
680 : * so try to reserve the space in inode first.
681 : */
682 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
683 0 : if (IS_ERR(handle)) {
684 0 : ret = PTR_ERR(handle);
685 0 : handle = NULL;
686 0 : goto out;
687 : }
688 :
689 0 : ret = ext4_prepare_inline_data(handle, inode, pos + len);
690 0 : if (ret && ret != -ENOSPC)
691 0 : goto out;
692 :
693 : /* We don't have space in inline inode, so convert it to extent. */
694 0 : if (ret == -ENOSPC) {
695 0 : ext4_journal_stop(handle);
696 0 : brelse(iloc.bh);
697 0 : goto convert;
698 : }
699 :
700 0 : ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
701 : EXT4_JTR_NONE);
702 0 : if (ret)
703 0 : goto out;
704 :
705 0 : folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
706 : mapping_gfp_mask(mapping));
707 0 : if (IS_ERR(folio)) {
708 0 : ret = PTR_ERR(folio);
709 0 : goto out;
710 : }
711 :
712 0 : *pagep = &folio->page;
713 0 : down_read(&EXT4_I(inode)->xattr_sem);
714 0 : if (!ext4_has_inline_data(inode)) {
715 0 : ret = 0;
716 0 : folio_unlock(folio);
717 0 : folio_put(folio);
718 0 : goto out_up_read;
719 : }
720 :
721 0 : if (!folio_test_uptodate(folio)) {
722 0 : ret = ext4_read_inline_folio(inode, folio);
723 0 : if (ret < 0) {
724 0 : folio_unlock(folio);
725 0 : folio_put(folio);
726 0 : goto out_up_read;
727 : }
728 : }
729 :
730 : ret = 1;
731 : handle = NULL;
732 0 : out_up_read:
733 0 : up_read(&EXT4_I(inode)->xattr_sem);
734 0 : out:
735 0 : if (handle && (ret != 1))
736 0 : ext4_journal_stop(handle);
737 0 : brelse(iloc.bh);
738 : return ret;
739 0 : convert:
740 0 : return ext4_convert_inline_data_to_extent(mapping, inode);
741 : }
742 :
743 0 : int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
744 : unsigned copied, struct folio *folio)
745 : {
746 0 : handle_t *handle = ext4_journal_current_handle();
747 0 : int no_expand;
748 0 : void *kaddr;
749 0 : struct ext4_iloc iloc;
750 0 : int ret = 0, ret2;
751 :
752 0 : if (unlikely(copied < len) && !folio_test_uptodate(folio))
753 0 : copied = 0;
754 :
755 0 : if (likely(copied)) {
756 0 : ret = ext4_get_inode_loc(inode, &iloc);
757 0 : if (ret) {
758 0 : folio_unlock(folio);
759 0 : folio_put(folio);
760 0 : ext4_std_error(inode->i_sb, ret);
761 0 : goto out;
762 : }
763 0 : ext4_write_lock_xattr(inode, &no_expand);
764 0 : BUG_ON(!ext4_has_inline_data(inode));
765 :
766 : /*
767 : * ei->i_inline_off may have changed since
768 : * ext4_write_begin() called
769 : * ext4_try_to_write_inline_data()
770 : */
771 0 : (void) ext4_find_inline_data_nolock(inode);
772 :
773 0 : kaddr = kmap_local_folio(folio, 0);
774 0 : ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
775 0 : kunmap_local(kaddr);
776 0 : folio_mark_uptodate(folio);
777 : /* clear dirty flag so that writepages wouldn't work for us. */
778 0 : folio_clear_dirty(folio);
779 :
780 0 : ext4_write_unlock_xattr(inode, &no_expand);
781 0 : brelse(iloc.bh);
782 :
783 : /*
784 : * It's important to update i_size while still holding folio
785 : * lock: page writeout could otherwise come in and zero
786 : * beyond i_size.
787 : */
788 0 : ext4_update_inode_size(inode, pos + copied);
789 : }
790 0 : folio_unlock(folio);
791 0 : folio_put(folio);
792 :
793 : /*
794 : * Don't mark the inode dirty under folio lock. First, it unnecessarily
795 : * makes the holding time of folio lock longer. Second, it forces lock
796 : * ordering of folio lock and transaction start for journaling
797 : * filesystems.
798 : */
799 0 : if (likely(copied))
800 0 : mark_inode_dirty(inode);
801 0 : out:
802 : /*
803 : * If we didn't copy as much data as expected, we need to trim back
804 : * size of xattr containing inline data.
805 : */
806 0 : if (pos + len > inode->i_size && ext4_can_truncate(inode))
807 0 : ext4_orphan_add(handle, inode);
808 :
809 0 : ret2 = ext4_journal_stop(handle);
810 0 : if (!ret)
811 0 : ret = ret2;
812 0 : if (pos + len > inode->i_size) {
813 0 : ext4_truncate_failed_write(inode);
814 : /*
815 : * If truncate failed early the inode might still be
816 : * on the orphan list; we need to make sure the inode
817 : * is removed from the orphan list in that case.
818 : */
819 0 : if (inode->i_nlink)
820 0 : ext4_orphan_del(NULL, inode);
821 : }
822 0 : return ret ? ret : copied;
823 : }
824 :
825 : /*
826 : * Try to make the page cache and handle ready for the inline data case.
827 : * We can call this function in 2 cases:
828 : * 1. The inode is created and the first write exceeds inline size. We can
829 : * clear the inode state safely.
830 : * 2. The inode has inline data, then we need to read the data, make it
831 : * update and dirty so that ext4_da_writepages can handle it. We don't
832 : * need to start the journal since the file's metadata isn't changed now.
833 : */
834 0 : static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
835 : struct inode *inode,
836 : void **fsdata)
837 : {
838 0 : int ret = 0, inline_size;
839 0 : struct folio *folio;
840 :
841 0 : folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
842 : mapping_gfp_mask(mapping));
843 0 : if (IS_ERR(folio))
844 0 : return PTR_ERR(folio);
845 :
846 0 : down_read(&EXT4_I(inode)->xattr_sem);
847 0 : if (!ext4_has_inline_data(inode)) {
848 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
849 0 : goto out;
850 : }
851 :
852 0 : inline_size = ext4_get_inline_size(inode);
853 :
854 0 : if (!folio_test_uptodate(folio)) {
855 0 : ret = ext4_read_inline_folio(inode, folio);
856 0 : if (ret < 0)
857 0 : goto out;
858 : }
859 :
860 0 : ret = __block_write_begin(&folio->page, 0, inline_size,
861 : ext4_da_get_block_prep);
862 0 : if (ret) {
863 0 : up_read(&EXT4_I(inode)->xattr_sem);
864 0 : folio_unlock(folio);
865 0 : folio_put(folio);
866 0 : ext4_truncate_failed_write(inode);
867 0 : return ret;
868 : }
869 :
870 0 : folio_mark_dirty(folio);
871 0 : folio_mark_uptodate(folio);
872 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
873 0 : *fsdata = (void *)CONVERT_INLINE_DATA;
874 :
875 0 : out:
876 0 : up_read(&EXT4_I(inode)->xattr_sem);
877 0 : if (folio) {
878 0 : folio_unlock(folio);
879 0 : folio_put(folio);
880 : }
881 : return ret;
882 : }
883 :
884 : /*
885 : * Prepare the write for the inline data.
886 : * If the data can be written into the inode, we just read
887 : * the page and make it uptodate, and start the journal.
888 : * Otherwise read the page, makes it dirty so that it can be
889 : * handle in writepages(the i_disksize update is left to the
890 : * normal ext4_da_write_end).
891 : */
892 0 : int ext4_da_write_inline_data_begin(struct address_space *mapping,
893 : struct inode *inode,
894 : loff_t pos, unsigned len,
895 : struct page **pagep,
896 : void **fsdata)
897 : {
898 0 : int ret;
899 0 : handle_t *handle;
900 0 : struct folio *folio;
901 0 : struct ext4_iloc iloc;
902 0 : int retries = 0;
903 :
904 0 : ret = ext4_get_inode_loc(inode, &iloc);
905 0 : if (ret)
906 : return ret;
907 :
908 0 : retry_journal:
909 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
910 0 : if (IS_ERR(handle)) {
911 0 : ret = PTR_ERR(handle);
912 0 : goto out;
913 : }
914 :
915 0 : ret = ext4_prepare_inline_data(handle, inode, pos + len);
916 0 : if (ret && ret != -ENOSPC)
917 0 : goto out_journal;
918 :
919 0 : if (ret == -ENOSPC) {
920 0 : ext4_journal_stop(handle);
921 0 : ret = ext4_da_convert_inline_data_to_extent(mapping,
922 : inode,
923 : fsdata);
924 0 : if (ret == -ENOSPC &&
925 0 : ext4_should_retry_alloc(inode->i_sb, &retries))
926 0 : goto retry_journal;
927 0 : goto out;
928 : }
929 :
930 : /*
931 : * We cannot recurse into the filesystem as the transaction
932 : * is already started.
933 : */
934 0 : folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
935 : mapping_gfp_mask(mapping));
936 0 : if (IS_ERR(folio)) {
937 0 : ret = PTR_ERR(folio);
938 0 : goto out_journal;
939 : }
940 :
941 0 : down_read(&EXT4_I(inode)->xattr_sem);
942 0 : if (!ext4_has_inline_data(inode)) {
943 0 : ret = 0;
944 0 : goto out_release_page;
945 : }
946 :
947 0 : if (!folio_test_uptodate(folio)) {
948 0 : ret = ext4_read_inline_folio(inode, folio);
949 0 : if (ret < 0)
950 0 : goto out_release_page;
951 : }
952 0 : ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh,
953 : EXT4_JTR_NONE);
954 0 : if (ret)
955 0 : goto out_release_page;
956 :
957 0 : up_read(&EXT4_I(inode)->xattr_sem);
958 0 : *pagep = &folio->page;
959 0 : brelse(iloc.bh);
960 : return 1;
961 0 : out_release_page:
962 0 : up_read(&EXT4_I(inode)->xattr_sem);
963 0 : folio_unlock(folio);
964 0 : folio_put(folio);
965 0 : out_journal:
966 0 : ext4_journal_stop(handle);
967 0 : out:
968 0 : brelse(iloc.bh);
969 : return ret;
970 : }
971 :
972 : #ifdef INLINE_DIR_DEBUG
973 : void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
974 : void *inline_start, int inline_size)
975 : {
976 : int offset;
977 : unsigned short de_len;
978 : struct ext4_dir_entry_2 *de = inline_start;
979 : void *dlimit = inline_start + inline_size;
980 :
981 : trace_printk("inode %lu\n", dir->i_ino);
982 : offset = 0;
983 : while ((void *)de < dlimit) {
984 : de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
985 : trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
986 : offset, de_len, de->name_len, de->name,
987 : de->name_len, le32_to_cpu(de->inode));
988 : if (ext4_check_dir_entry(dir, NULL, de, bh,
989 : inline_start, inline_size, offset))
990 : BUG();
991 :
992 : offset += de_len;
993 : de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
994 : }
995 : }
996 : #else
997 : #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
998 : #endif
999 :
1000 : /*
1001 : * Add a new entry into a inline dir.
1002 : * It will return -ENOSPC if no space is available, and -EIO
1003 : * and -EEXIST if directory entry already exists.
1004 : */
1005 0 : static int ext4_add_dirent_to_inline(handle_t *handle,
1006 : struct ext4_filename *fname,
1007 : struct inode *dir,
1008 : struct inode *inode,
1009 : struct ext4_iloc *iloc,
1010 : void *inline_start, int inline_size)
1011 : {
1012 0 : int err;
1013 0 : struct ext4_dir_entry_2 *de;
1014 :
1015 0 : err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1016 : inline_size, fname, &de);
1017 0 : if (err)
1018 : return err;
1019 :
1020 0 : BUFFER_TRACE(iloc->bh, "get_write_access");
1021 0 : err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
1022 : EXT4_JTR_NONE);
1023 0 : if (err)
1024 : return err;
1025 0 : ext4_insert_dentry(dir, inode, de, inline_size, fname);
1026 :
1027 0 : ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1028 :
1029 : /*
1030 : * XXX shouldn't update any times until successful
1031 : * completion of syscall, but too many callers depend
1032 : * on this.
1033 : *
1034 : * XXX similarly, too many callers depend on
1035 : * ext4_new_inode() setting the times, but error
1036 : * recovery deletes the inode, so the worst that can
1037 : * happen is that the times are slightly out of date
1038 : * and/or different from the directory change time.
1039 : */
1040 0 : dir->i_mtime = dir->i_ctime = current_time(dir);
1041 0 : ext4_update_dx_flag(dir);
1042 0 : inode_inc_iversion(dir);
1043 0 : return 1;
1044 : }
1045 :
1046 0 : static void *ext4_get_inline_xattr_pos(struct inode *inode,
1047 : struct ext4_iloc *iloc)
1048 : {
1049 0 : struct ext4_xattr_entry *entry;
1050 0 : struct ext4_xattr_ibody_header *header;
1051 :
1052 0 : BUG_ON(!EXT4_I(inode)->i_inline_off);
1053 :
1054 0 : header = IHDR(inode, ext4_raw_inode(iloc));
1055 0 : entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1056 0 : EXT4_I(inode)->i_inline_off);
1057 :
1058 0 : return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1059 : }
1060 :
1061 : /* Set the final de to cover the whole block. */
1062 0 : static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1063 : {
1064 0 : struct ext4_dir_entry_2 *de, *prev_de;
1065 0 : void *limit;
1066 0 : int de_len;
1067 :
1068 0 : de = de_buf;
1069 0 : if (old_size) {
1070 0 : limit = de_buf + old_size;
1071 0 : do {
1072 0 : prev_de = de;
1073 0 : de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1074 0 : de_buf += de_len;
1075 0 : de = de_buf;
1076 0 : } while (de_buf < limit);
1077 :
1078 0 : prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1079 : old_size, new_size);
1080 : } else {
1081 : /* this is just created, so create an empty entry. */
1082 0 : de->inode = 0;
1083 0 : de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1084 : }
1085 0 : }
1086 :
1087 0 : static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1088 : struct ext4_iloc *iloc)
1089 : {
1090 0 : int ret;
1091 0 : int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1092 0 : int new_size = get_max_inline_xattr_value_size(dir, iloc);
1093 :
1094 0 : if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1095 : return -ENOSPC;
1096 :
1097 0 : ret = ext4_update_inline_data(handle, dir,
1098 : new_size + EXT4_MIN_INLINE_DATA_SIZE);
1099 0 : if (ret)
1100 : return ret;
1101 :
1102 0 : ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1103 0 : EXT4_I(dir)->i_inline_size -
1104 : EXT4_MIN_INLINE_DATA_SIZE);
1105 0 : dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1106 0 : return 0;
1107 : }
1108 :
1109 0 : static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1110 : struct ext4_iloc *iloc,
1111 : void *buf, int inline_size)
1112 : {
1113 0 : int ret;
1114 :
1115 0 : ret = ext4_create_inline_data(handle, inode, inline_size);
1116 0 : if (ret) {
1117 0 : ext4_msg(inode->i_sb, KERN_EMERG,
1118 : "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1119 : inode->i_ino, ret);
1120 0 : return;
1121 : }
1122 0 : ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1123 0 : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1124 : }
1125 :
1126 0 : static int ext4_finish_convert_inline_dir(handle_t *handle,
1127 : struct inode *inode,
1128 : struct buffer_head *dir_block,
1129 : void *buf,
1130 : int inline_size)
1131 : {
1132 0 : int err, csum_size = 0, header_size = 0;
1133 0 : struct ext4_dir_entry_2 *de;
1134 0 : void *target = dir_block->b_data;
1135 :
1136 : /*
1137 : * First create "." and ".." and then copy the dir information
1138 : * back to the block.
1139 : */
1140 0 : de = target;
1141 0 : de = ext4_init_dot_dotdot(inode, de,
1142 0 : inode->i_sb->s_blocksize, csum_size,
1143 0 : le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1144 0 : header_size = (void *)de - target;
1145 :
1146 0 : memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1147 : inline_size - EXT4_INLINE_DOTDOT_SIZE);
1148 :
1149 0 : if (ext4_has_metadata_csum(inode->i_sb))
1150 0 : csum_size = sizeof(struct ext4_dir_entry_tail);
1151 :
1152 0 : inode->i_size = inode->i_sb->s_blocksize;
1153 0 : i_size_write(inode, inode->i_sb->s_blocksize);
1154 0 : EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1155 0 : ext4_update_final_de(dir_block->b_data,
1156 0 : inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1157 0 : inode->i_sb->s_blocksize - csum_size);
1158 :
1159 0 : if (csum_size)
1160 0 : ext4_initialize_dirent_tail(dir_block,
1161 0 : inode->i_sb->s_blocksize);
1162 0 : set_buffer_uptodate(dir_block);
1163 0 : unlock_buffer(dir_block);
1164 0 : err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1165 0 : if (err)
1166 : return err;
1167 0 : set_buffer_verified(dir_block);
1168 0 : return ext4_mark_inode_dirty(handle, inode);
1169 : }
1170 :
1171 0 : static int ext4_convert_inline_data_nolock(handle_t *handle,
1172 : struct inode *inode,
1173 : struct ext4_iloc *iloc)
1174 : {
1175 0 : int error;
1176 0 : void *buf = NULL;
1177 0 : struct buffer_head *data_bh = NULL;
1178 0 : struct ext4_map_blocks map;
1179 0 : int inline_size;
1180 :
1181 0 : inline_size = ext4_get_inline_size(inode);
1182 0 : buf = kmalloc(inline_size, GFP_NOFS);
1183 0 : if (!buf) {
1184 0 : error = -ENOMEM;
1185 0 : goto out;
1186 : }
1187 :
1188 0 : error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1189 0 : if (error < 0)
1190 0 : goto out;
1191 :
1192 : /*
1193 : * Make sure the inline directory entries pass checks before we try to
1194 : * convert them, so that we avoid touching stuff that needs fsck.
1195 : */
1196 0 : if (S_ISDIR(inode->i_mode)) {
1197 0 : error = ext4_check_all_de(inode, iloc->bh,
1198 : buf + EXT4_INLINE_DOTDOT_SIZE,
1199 : inline_size - EXT4_INLINE_DOTDOT_SIZE);
1200 0 : if (error)
1201 0 : goto out;
1202 : }
1203 :
1204 0 : error = ext4_destroy_inline_data_nolock(handle, inode);
1205 0 : if (error)
1206 0 : goto out;
1207 :
1208 0 : map.m_lblk = 0;
1209 0 : map.m_len = 1;
1210 0 : map.m_flags = 0;
1211 0 : error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1212 0 : if (error < 0)
1213 0 : goto out_restore;
1214 0 : if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1215 0 : error = -EIO;
1216 0 : goto out_restore;
1217 : }
1218 :
1219 0 : data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1220 0 : if (!data_bh) {
1221 0 : error = -ENOMEM;
1222 0 : goto out_restore;
1223 : }
1224 :
1225 0 : lock_buffer(data_bh);
1226 0 : error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1227 : EXT4_JTR_NONE);
1228 0 : if (error) {
1229 0 : unlock_buffer(data_bh);
1230 0 : error = -EIO;
1231 0 : goto out_restore;
1232 : }
1233 0 : memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1234 :
1235 0 : if (!S_ISDIR(inode->i_mode)) {
1236 0 : memcpy(data_bh->b_data, buf, inline_size);
1237 0 : set_buffer_uptodate(data_bh);
1238 0 : unlock_buffer(data_bh);
1239 0 : error = ext4_handle_dirty_metadata(handle,
1240 : inode, data_bh);
1241 : } else {
1242 0 : error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1243 : buf, inline_size);
1244 : }
1245 :
1246 0 : out_restore:
1247 0 : if (error)
1248 0 : ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1249 :
1250 0 : out:
1251 0 : brelse(data_bh);
1252 0 : kfree(buf);
1253 0 : return error;
1254 : }
1255 :
1256 : /*
1257 : * Try to add the new entry to the inline data.
1258 : * If succeeds, return 0. If not, extended the inline dir and copied data to
1259 : * the new created block.
1260 : */
1261 0 : int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1262 : struct inode *dir, struct inode *inode)
1263 : {
1264 0 : int ret, ret2, inline_size, no_expand;
1265 0 : void *inline_start;
1266 0 : struct ext4_iloc iloc;
1267 :
1268 0 : ret = ext4_get_inode_loc(dir, &iloc);
1269 0 : if (ret)
1270 : return ret;
1271 :
1272 0 : ext4_write_lock_xattr(dir, &no_expand);
1273 0 : if (!ext4_has_inline_data(dir))
1274 0 : goto out;
1275 :
1276 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1277 : EXT4_INLINE_DOTDOT_SIZE;
1278 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1279 :
1280 0 : ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1281 : inline_start, inline_size);
1282 0 : if (ret != -ENOSPC)
1283 0 : goto out;
1284 :
1285 : /* check whether it can be inserted to inline xattr space. */
1286 0 : inline_size = EXT4_I(dir)->i_inline_size -
1287 : EXT4_MIN_INLINE_DATA_SIZE;
1288 0 : if (!inline_size) {
1289 : /* Try to use the xattr space.*/
1290 0 : ret = ext4_update_inline_dir(handle, dir, &iloc);
1291 0 : if (ret && ret != -ENOSPC)
1292 0 : goto out;
1293 :
1294 0 : inline_size = EXT4_I(dir)->i_inline_size -
1295 : EXT4_MIN_INLINE_DATA_SIZE;
1296 : }
1297 :
1298 0 : if (inline_size) {
1299 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1300 :
1301 0 : ret = ext4_add_dirent_to_inline(handle, fname, dir,
1302 : inode, &iloc, inline_start,
1303 : inline_size);
1304 :
1305 0 : if (ret != -ENOSPC)
1306 0 : goto out;
1307 : }
1308 :
1309 : /*
1310 : * The inline space is filled up, so create a new block for it.
1311 : * As the extent tree will be created, we have to save the inline
1312 : * dir first.
1313 : */
1314 0 : ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1315 :
1316 0 : out:
1317 0 : ext4_write_unlock_xattr(dir, &no_expand);
1318 0 : ret2 = ext4_mark_inode_dirty(handle, dir);
1319 0 : if (unlikely(ret2 && !ret))
1320 0 : ret = ret2;
1321 0 : brelse(iloc.bh);
1322 : return ret;
1323 : }
1324 :
1325 : /*
1326 : * This function fills a red-black tree with information from an
1327 : * inlined dir. It returns the number directory entries loaded
1328 : * into the tree. If there is an error it is returned in err.
1329 : */
1330 0 : int ext4_inlinedir_to_tree(struct file *dir_file,
1331 : struct inode *dir, ext4_lblk_t block,
1332 : struct dx_hash_info *hinfo,
1333 : __u32 start_hash, __u32 start_minor_hash,
1334 : int *has_inline_data)
1335 : {
1336 0 : int err = 0, count = 0;
1337 0 : unsigned int parent_ino;
1338 0 : int pos;
1339 0 : struct ext4_dir_entry_2 *de;
1340 0 : struct inode *inode = file_inode(dir_file);
1341 0 : int ret, inline_size = 0;
1342 0 : struct ext4_iloc iloc;
1343 0 : void *dir_buf = NULL;
1344 0 : struct ext4_dir_entry_2 fake;
1345 0 : struct fscrypt_str tmp_str;
1346 :
1347 0 : ret = ext4_get_inode_loc(inode, &iloc);
1348 0 : if (ret)
1349 : return ret;
1350 :
1351 0 : down_read(&EXT4_I(inode)->xattr_sem);
1352 0 : if (!ext4_has_inline_data(inode)) {
1353 0 : up_read(&EXT4_I(inode)->xattr_sem);
1354 0 : *has_inline_data = 0;
1355 0 : goto out;
1356 : }
1357 :
1358 0 : inline_size = ext4_get_inline_size(inode);
1359 0 : dir_buf = kmalloc(inline_size, GFP_NOFS);
1360 0 : if (!dir_buf) {
1361 0 : ret = -ENOMEM;
1362 0 : up_read(&EXT4_I(inode)->xattr_sem);
1363 0 : goto out;
1364 : }
1365 :
1366 0 : ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1367 0 : up_read(&EXT4_I(inode)->xattr_sem);
1368 0 : if (ret < 0)
1369 0 : goto out;
1370 :
1371 0 : pos = 0;
1372 0 : parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1373 0 : while (pos < inline_size) {
1374 : /*
1375 : * As inlined dir doesn't store any information about '.' and
1376 : * only the inode number of '..' is stored, we have to handle
1377 : * them differently.
1378 : */
1379 0 : if (pos == 0) {
1380 0 : fake.inode = cpu_to_le32(inode->i_ino);
1381 0 : fake.name_len = 1;
1382 0 : strcpy(fake.name, ".");
1383 0 : fake.rec_len = ext4_rec_len_to_disk(
1384 : ext4_dir_rec_len(fake.name_len, NULL),
1385 : inline_size);
1386 0 : ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1387 : de = &fake;
1388 : pos = EXT4_INLINE_DOTDOT_OFFSET;
1389 0 : } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1390 0 : fake.inode = cpu_to_le32(parent_ino);
1391 0 : fake.name_len = 2;
1392 0 : strcpy(fake.name, "..");
1393 0 : fake.rec_len = ext4_rec_len_to_disk(
1394 : ext4_dir_rec_len(fake.name_len, NULL),
1395 : inline_size);
1396 0 : ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1397 : de = &fake;
1398 : pos = EXT4_INLINE_DOTDOT_SIZE;
1399 : } else {
1400 0 : de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1401 0 : pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1402 0 : if (ext4_check_dir_entry(inode, dir_file, de,
1403 : iloc.bh, dir_buf,
1404 : inline_size, pos)) {
1405 0 : ret = count;
1406 0 : goto out;
1407 : }
1408 : }
1409 :
1410 0 : if (ext4_hash_in_dirent(dir)) {
1411 0 : hinfo->hash = EXT4_DIRENT_HASH(de);
1412 0 : hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1413 : } else {
1414 0 : ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1415 : }
1416 0 : if ((hinfo->hash < start_hash) ||
1417 0 : ((hinfo->hash == start_hash) &&
1418 0 : (hinfo->minor_hash < start_minor_hash)))
1419 0 : continue;
1420 0 : if (de->inode == 0)
1421 0 : continue;
1422 0 : tmp_str.name = de->name;
1423 0 : tmp_str.len = de->name_len;
1424 0 : err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1425 : hinfo->minor_hash, de, &tmp_str);
1426 0 : if (err) {
1427 0 : ret = err;
1428 0 : goto out;
1429 : }
1430 0 : count++;
1431 : }
1432 : ret = count;
1433 0 : out:
1434 0 : kfree(dir_buf);
1435 0 : brelse(iloc.bh);
1436 : return ret;
1437 : }
1438 :
1439 : /*
1440 : * So this function is called when the volume is mkfsed with
1441 : * dir_index disabled. In order to keep f_pos persistent
1442 : * after we convert from an inlined dir to a blocked based,
1443 : * we just pretend that we are a normal dir and return the
1444 : * offset as if '.' and '..' really take place.
1445 : *
1446 : */
1447 0 : int ext4_read_inline_dir(struct file *file,
1448 : struct dir_context *ctx,
1449 : int *has_inline_data)
1450 : {
1451 0 : unsigned int offset, parent_ino;
1452 0 : int i;
1453 0 : struct ext4_dir_entry_2 *de;
1454 0 : struct super_block *sb;
1455 0 : struct inode *inode = file_inode(file);
1456 0 : int ret, inline_size = 0;
1457 0 : struct ext4_iloc iloc;
1458 0 : void *dir_buf = NULL;
1459 0 : int dotdot_offset, dotdot_size, extra_offset, extra_size;
1460 :
1461 0 : ret = ext4_get_inode_loc(inode, &iloc);
1462 0 : if (ret)
1463 : return ret;
1464 :
1465 0 : down_read(&EXT4_I(inode)->xattr_sem);
1466 0 : if (!ext4_has_inline_data(inode)) {
1467 0 : up_read(&EXT4_I(inode)->xattr_sem);
1468 0 : *has_inline_data = 0;
1469 0 : goto out;
1470 : }
1471 :
1472 0 : inline_size = ext4_get_inline_size(inode);
1473 0 : dir_buf = kmalloc(inline_size, GFP_NOFS);
1474 0 : if (!dir_buf) {
1475 0 : ret = -ENOMEM;
1476 0 : up_read(&EXT4_I(inode)->xattr_sem);
1477 0 : goto out;
1478 : }
1479 :
1480 0 : ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1481 0 : up_read(&EXT4_I(inode)->xattr_sem);
1482 0 : if (ret < 0)
1483 0 : goto out;
1484 :
1485 0 : ret = 0;
1486 0 : sb = inode->i_sb;
1487 0 : parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1488 0 : offset = ctx->pos;
1489 :
1490 : /*
1491 : * dotdot_offset and dotdot_size is the real offset and
1492 : * size for ".." and "." if the dir is block based while
1493 : * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1494 : * So we will use extra_offset and extra_size to indicate them
1495 : * during the inline dir iteration.
1496 : */
1497 0 : dotdot_offset = ext4_dir_rec_len(1, NULL);
1498 0 : dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1499 0 : extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1500 0 : extra_size = extra_offset + inline_size;
1501 :
1502 : /*
1503 : * If the version has changed since the last call to
1504 : * readdir(2), then we might be pointing to an invalid
1505 : * dirent right now. Scan from the start of the inline
1506 : * dir to make sure.
1507 : */
1508 0 : if (!inode_eq_iversion(inode, file->f_version)) {
1509 0 : for (i = 0; i < extra_size && i < offset;) {
1510 : /*
1511 : * "." is with offset 0 and
1512 : * ".." is dotdot_offset.
1513 : */
1514 0 : if (!i) {
1515 0 : i = dotdot_offset;
1516 0 : continue;
1517 0 : } else if (i == dotdot_offset) {
1518 0 : i = dotdot_size;
1519 0 : continue;
1520 : }
1521 : /* for other entry, the real offset in
1522 : * the buf has to be tuned accordingly.
1523 : */
1524 0 : de = (struct ext4_dir_entry_2 *)
1525 0 : (dir_buf + i - extra_offset);
1526 : /* It's too expensive to do a full
1527 : * dirent test each time round this
1528 : * loop, but we do have to test at
1529 : * least that it is non-zero. A
1530 : * failure will be detected in the
1531 : * dirent test below. */
1532 0 : if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1533 : < ext4_dir_rec_len(1, NULL))
1534 : break;
1535 0 : i += ext4_rec_len_from_disk(de->rec_len,
1536 : extra_size);
1537 : }
1538 0 : offset = i;
1539 0 : ctx->pos = offset;
1540 0 : file->f_version = inode_query_iversion(inode);
1541 : }
1542 :
1543 0 : while (ctx->pos < extra_size) {
1544 0 : if (ctx->pos == 0) {
1545 0 : if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1546 0 : goto out;
1547 0 : ctx->pos = dotdot_offset;
1548 0 : continue;
1549 : }
1550 :
1551 0 : if (ctx->pos == dotdot_offset) {
1552 0 : if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1553 0 : goto out;
1554 0 : ctx->pos = dotdot_size;
1555 0 : continue;
1556 : }
1557 :
1558 0 : de = (struct ext4_dir_entry_2 *)
1559 0 : (dir_buf + ctx->pos - extra_offset);
1560 0 : if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1561 : extra_size, ctx->pos))
1562 0 : goto out;
1563 0 : if (le32_to_cpu(de->inode)) {
1564 0 : if (!dir_emit(ctx, de->name, de->name_len,
1565 : le32_to_cpu(de->inode),
1566 0 : get_dtype(sb, de->file_type)))
1567 0 : goto out;
1568 : }
1569 0 : ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1570 : }
1571 0 : out:
1572 0 : kfree(dir_buf);
1573 0 : brelse(iloc.bh);
1574 : return ret;
1575 : }
1576 :
1577 0 : void *ext4_read_inline_link(struct inode *inode)
1578 : {
1579 0 : struct ext4_iloc iloc;
1580 0 : int ret, inline_size;
1581 0 : void *link;
1582 :
1583 0 : ret = ext4_get_inode_loc(inode, &iloc);
1584 0 : if (ret)
1585 0 : return ERR_PTR(ret);
1586 :
1587 0 : ret = -ENOMEM;
1588 0 : inline_size = ext4_get_inline_size(inode);
1589 0 : link = kmalloc(inline_size + 1, GFP_NOFS);
1590 0 : if (!link)
1591 0 : goto out;
1592 :
1593 0 : ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1594 0 : if (ret < 0) {
1595 0 : kfree(link);
1596 0 : goto out;
1597 : }
1598 0 : nd_terminate_link(link, inode->i_size, ret);
1599 0 : out:
1600 0 : if (ret < 0)
1601 0 : link = ERR_PTR(ret);
1602 0 : brelse(iloc.bh);
1603 : return link;
1604 : }
1605 :
1606 0 : struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1607 : struct ext4_dir_entry_2 **parent_de,
1608 : int *retval)
1609 : {
1610 0 : struct ext4_iloc iloc;
1611 :
1612 0 : *retval = ext4_get_inode_loc(inode, &iloc);
1613 0 : if (*retval)
1614 : return NULL;
1615 :
1616 0 : *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1617 :
1618 0 : return iloc.bh;
1619 : }
1620 :
1621 : /*
1622 : * Try to create the inline data for the new dir.
1623 : * If it succeeds, return 0, otherwise return the error.
1624 : * In case of ENOSPC, the caller should create the normal disk layout dir.
1625 : */
1626 0 : int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1627 : struct inode *inode)
1628 : {
1629 0 : int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1630 0 : struct ext4_iloc iloc;
1631 0 : struct ext4_dir_entry_2 *de;
1632 :
1633 0 : ret = ext4_get_inode_loc(inode, &iloc);
1634 0 : if (ret)
1635 : return ret;
1636 :
1637 0 : ret = ext4_prepare_inline_data(handle, inode, inline_size);
1638 0 : if (ret)
1639 0 : goto out;
1640 :
1641 : /*
1642 : * For inline dir, we only save the inode information for the ".."
1643 : * and create a fake dentry to cover the left space.
1644 : */
1645 0 : de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1646 0 : de->inode = cpu_to_le32(parent->i_ino);
1647 0 : de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1648 0 : de->inode = 0;
1649 0 : de->rec_len = ext4_rec_len_to_disk(
1650 : inline_size - EXT4_INLINE_DOTDOT_SIZE,
1651 : inline_size);
1652 0 : set_nlink(inode, 2);
1653 0 : inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1654 0 : out:
1655 0 : brelse(iloc.bh);
1656 : return ret;
1657 : }
1658 :
1659 0 : struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1660 : struct ext4_filename *fname,
1661 : struct ext4_dir_entry_2 **res_dir,
1662 : int *has_inline_data)
1663 : {
1664 0 : int ret;
1665 0 : struct ext4_iloc iloc;
1666 0 : void *inline_start;
1667 0 : int inline_size;
1668 :
1669 0 : if (ext4_get_inode_loc(dir, &iloc))
1670 : return NULL;
1671 :
1672 0 : down_read(&EXT4_I(dir)->xattr_sem);
1673 0 : if (!ext4_has_inline_data(dir)) {
1674 0 : *has_inline_data = 0;
1675 0 : goto out;
1676 : }
1677 :
1678 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1679 : EXT4_INLINE_DOTDOT_SIZE;
1680 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1681 0 : ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1682 : dir, fname, 0, res_dir);
1683 0 : if (ret == 1)
1684 0 : goto out_find;
1685 0 : if (ret < 0)
1686 0 : goto out;
1687 :
1688 0 : if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1689 0 : goto out;
1690 :
1691 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1692 0 : inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1693 :
1694 0 : ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1695 : dir, fname, 0, res_dir);
1696 0 : if (ret == 1)
1697 0 : goto out_find;
1698 :
1699 0 : out:
1700 0 : brelse(iloc.bh);
1701 0 : iloc.bh = NULL;
1702 0 : out_find:
1703 0 : up_read(&EXT4_I(dir)->xattr_sem);
1704 0 : return iloc.bh;
1705 : }
1706 :
1707 0 : int ext4_delete_inline_entry(handle_t *handle,
1708 : struct inode *dir,
1709 : struct ext4_dir_entry_2 *de_del,
1710 : struct buffer_head *bh,
1711 : int *has_inline_data)
1712 : {
1713 0 : int err, inline_size, no_expand;
1714 0 : struct ext4_iloc iloc;
1715 0 : void *inline_start;
1716 :
1717 0 : err = ext4_get_inode_loc(dir, &iloc);
1718 0 : if (err)
1719 : return err;
1720 :
1721 0 : ext4_write_lock_xattr(dir, &no_expand);
1722 0 : if (!ext4_has_inline_data(dir)) {
1723 0 : *has_inline_data = 0;
1724 0 : goto out;
1725 : }
1726 :
1727 0 : if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1728 : EXT4_MIN_INLINE_DATA_SIZE) {
1729 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1730 : EXT4_INLINE_DOTDOT_SIZE;
1731 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1732 : EXT4_INLINE_DOTDOT_SIZE;
1733 : } else {
1734 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1735 0 : inline_size = ext4_get_inline_size(dir) -
1736 : EXT4_MIN_INLINE_DATA_SIZE;
1737 : }
1738 :
1739 0 : BUFFER_TRACE(bh, "get_write_access");
1740 0 : err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1741 : EXT4_JTR_NONE);
1742 0 : if (err)
1743 0 : goto out;
1744 :
1745 0 : err = ext4_generic_delete_entry(dir, de_del, bh,
1746 : inline_start, inline_size, 0);
1747 0 : if (err)
1748 0 : goto out;
1749 :
1750 0 : ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1751 0 : out:
1752 0 : ext4_write_unlock_xattr(dir, &no_expand);
1753 0 : if (likely(err == 0))
1754 0 : err = ext4_mark_inode_dirty(handle, dir);
1755 0 : brelse(iloc.bh);
1756 0 : if (err != -ENOENT)
1757 0 : ext4_std_error(dir->i_sb, err);
1758 : return err;
1759 : }
1760 :
1761 : /*
1762 : * Get the inline dentry at offset.
1763 : */
1764 : static inline struct ext4_dir_entry_2 *
1765 0 : ext4_get_inline_entry(struct inode *inode,
1766 : struct ext4_iloc *iloc,
1767 : unsigned int offset,
1768 : void **inline_start,
1769 : int *inline_size)
1770 : {
1771 0 : void *inline_pos;
1772 :
1773 0 : BUG_ON(offset > ext4_get_inline_size(inode));
1774 :
1775 0 : if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1776 0 : inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1777 0 : *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1778 : } else {
1779 0 : inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1780 0 : offset -= EXT4_MIN_INLINE_DATA_SIZE;
1781 0 : *inline_size = ext4_get_inline_size(inode) -
1782 : EXT4_MIN_INLINE_DATA_SIZE;
1783 : }
1784 :
1785 0 : if (inline_start)
1786 0 : *inline_start = inline_pos;
1787 0 : return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1788 : }
1789 :
1790 0 : bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1791 : {
1792 0 : int err, inline_size;
1793 0 : struct ext4_iloc iloc;
1794 0 : size_t inline_len;
1795 0 : void *inline_pos;
1796 0 : unsigned int offset;
1797 0 : struct ext4_dir_entry_2 *de;
1798 0 : bool ret = false;
1799 :
1800 0 : err = ext4_get_inode_loc(dir, &iloc);
1801 0 : if (err) {
1802 0 : EXT4_ERROR_INODE_ERR(dir, -err,
1803 : "error %d getting inode %lu block",
1804 : err, dir->i_ino);
1805 0 : return false;
1806 : }
1807 :
1808 0 : down_read(&EXT4_I(dir)->xattr_sem);
1809 0 : if (!ext4_has_inline_data(dir)) {
1810 0 : *has_inline_data = 0;
1811 0 : ret = true;
1812 0 : goto out;
1813 : }
1814 :
1815 0 : de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1816 0 : if (!le32_to_cpu(de->inode)) {
1817 0 : ext4_warning(dir->i_sb,
1818 : "bad inline directory (dir #%lu) - no `..'",
1819 : dir->i_ino);
1820 0 : goto out;
1821 : }
1822 :
1823 0 : inline_len = ext4_get_inline_size(dir);
1824 0 : offset = EXT4_INLINE_DOTDOT_SIZE;
1825 0 : while (offset < inline_len) {
1826 0 : de = ext4_get_inline_entry(dir, &iloc, offset,
1827 : &inline_pos, &inline_size);
1828 0 : if (ext4_check_dir_entry(dir, NULL, de,
1829 : iloc.bh, inline_pos,
1830 : inline_size, offset)) {
1831 0 : ext4_warning(dir->i_sb,
1832 : "bad inline directory (dir #%lu) - "
1833 : "inode %u, rec_len %u, name_len %d"
1834 : "inline size %d",
1835 : dir->i_ino, le32_to_cpu(de->inode),
1836 : le16_to_cpu(de->rec_len), de->name_len,
1837 : inline_size);
1838 0 : goto out;
1839 : }
1840 0 : if (le32_to_cpu(de->inode)) {
1841 0 : goto out;
1842 : }
1843 0 : offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1844 : }
1845 :
1846 : ret = true;
1847 0 : out:
1848 0 : up_read(&EXT4_I(dir)->xattr_sem);
1849 0 : brelse(iloc.bh);
1850 : return ret;
1851 : }
1852 :
1853 0 : int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1854 : {
1855 0 : int ret, no_expand;
1856 :
1857 0 : ext4_write_lock_xattr(inode, &no_expand);
1858 0 : ret = ext4_destroy_inline_data_nolock(handle, inode);
1859 0 : ext4_write_unlock_xattr(inode, &no_expand);
1860 :
1861 0 : return ret;
1862 : }
1863 :
1864 0 : int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1865 : {
1866 0 : __u64 addr;
1867 0 : int error = -EAGAIN;
1868 0 : struct ext4_iloc iloc;
1869 :
1870 0 : down_read(&EXT4_I(inode)->xattr_sem);
1871 0 : if (!ext4_has_inline_data(inode))
1872 0 : goto out;
1873 :
1874 0 : error = ext4_get_inode_loc(inode, &iloc);
1875 0 : if (error)
1876 0 : goto out;
1877 :
1878 0 : addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1879 0 : addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1880 0 : addr += offsetof(struct ext4_inode, i_block);
1881 :
1882 0 : brelse(iloc.bh);
1883 :
1884 0 : iomap->addr = addr;
1885 0 : iomap->offset = 0;
1886 0 : iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1887 : i_size_read(inode));
1888 0 : iomap->type = IOMAP_INLINE;
1889 0 : iomap->flags = 0;
1890 :
1891 0 : out:
1892 0 : up_read(&EXT4_I(inode)->xattr_sem);
1893 0 : return error;
1894 : }
1895 :
1896 0 : int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1897 : {
1898 0 : handle_t *handle;
1899 0 : int inline_size, value_len, needed_blocks, no_expand, err = 0;
1900 0 : size_t i_size;
1901 0 : void *value = NULL;
1902 0 : struct ext4_xattr_ibody_find is = {
1903 : .s = { .not_found = -ENODATA, },
1904 : };
1905 0 : struct ext4_xattr_info i = {
1906 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
1907 : .name = EXT4_XATTR_SYSTEM_DATA,
1908 : };
1909 :
1910 :
1911 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
1912 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1913 0 : if (IS_ERR(handle))
1914 0 : return PTR_ERR(handle);
1915 :
1916 0 : ext4_write_lock_xattr(inode, &no_expand);
1917 0 : if (!ext4_has_inline_data(inode)) {
1918 0 : ext4_write_unlock_xattr(inode, &no_expand);
1919 0 : *has_inline = 0;
1920 0 : ext4_journal_stop(handle);
1921 0 : return 0;
1922 : }
1923 :
1924 0 : if ((err = ext4_orphan_add(handle, inode)) != 0)
1925 0 : goto out;
1926 :
1927 0 : if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1928 0 : goto out;
1929 :
1930 0 : down_write(&EXT4_I(inode)->i_data_sem);
1931 0 : i_size = inode->i_size;
1932 0 : inline_size = ext4_get_inline_size(inode);
1933 0 : EXT4_I(inode)->i_disksize = i_size;
1934 :
1935 0 : if (i_size < inline_size) {
1936 : /*
1937 : * if there's inline data to truncate and this file was
1938 : * converted to extents after that inline data was written,
1939 : * the extent status cache must be cleared to avoid leaving
1940 : * behind stale delayed allocated extent entries
1941 : */
1942 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1943 0 : ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1944 :
1945 : /* Clear the content in the xattr space. */
1946 0 : if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1947 0 : if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1948 0 : goto out_error;
1949 :
1950 0 : BUG_ON(is.s.not_found);
1951 :
1952 0 : value_len = le32_to_cpu(is.s.here->e_value_size);
1953 0 : value = kmalloc(value_len, GFP_NOFS);
1954 0 : if (!value) {
1955 0 : err = -ENOMEM;
1956 0 : goto out_error;
1957 : }
1958 :
1959 0 : err = ext4_xattr_ibody_get(inode, i.name_index,
1960 : i.name, value, value_len);
1961 0 : if (err <= 0)
1962 0 : goto out_error;
1963 :
1964 0 : i.value = value;
1965 0 : i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1966 0 : i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1967 0 : err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1968 0 : if (err)
1969 0 : goto out_error;
1970 : }
1971 :
1972 : /* Clear the content within i_blocks. */
1973 0 : if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1974 0 : void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1975 0 : memset(p + i_size, 0,
1976 : EXT4_MIN_INLINE_DATA_SIZE - i_size);
1977 : }
1978 :
1979 0 : EXT4_I(inode)->i_inline_size = i_size <
1980 : EXT4_MIN_INLINE_DATA_SIZE ?
1981 0 : EXT4_MIN_INLINE_DATA_SIZE : i_size;
1982 : }
1983 :
1984 0 : out_error:
1985 0 : up_write(&EXT4_I(inode)->i_data_sem);
1986 0 : out:
1987 0 : brelse(is.iloc.bh);
1988 0 : ext4_write_unlock_xattr(inode, &no_expand);
1989 0 : kfree(value);
1990 0 : if (inode->i_nlink)
1991 0 : ext4_orphan_del(handle, inode);
1992 :
1993 0 : if (err == 0) {
1994 0 : inode->i_mtime = inode->i_ctime = current_time(inode);
1995 0 : err = ext4_mark_inode_dirty(handle, inode);
1996 0 : if (IS_SYNC(inode))
1997 0 : ext4_handle_sync(handle);
1998 : }
1999 0 : ext4_journal_stop(handle);
2000 0 : return err;
2001 : }
2002 :
2003 0 : int ext4_convert_inline_data(struct inode *inode)
2004 : {
2005 0 : int error, needed_blocks, no_expand;
2006 0 : handle_t *handle;
2007 0 : struct ext4_iloc iloc;
2008 :
2009 0 : if (!ext4_has_inline_data(inode)) {
2010 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2011 0 : return 0;
2012 0 : } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
2013 : /*
2014 : * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
2015 : * cleared. This means we are in the middle of moving of
2016 : * inline data to delay allocated block. Just force writeout
2017 : * here to finish conversion.
2018 : */
2019 0 : error = filemap_flush(inode->i_mapping);
2020 0 : if (error)
2021 : return error;
2022 0 : if (!ext4_has_inline_data(inode))
2023 : return 0;
2024 : }
2025 :
2026 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
2027 :
2028 0 : iloc.bh = NULL;
2029 0 : error = ext4_get_inode_loc(inode, &iloc);
2030 0 : if (error)
2031 : return error;
2032 :
2033 0 : handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2034 0 : if (IS_ERR(handle)) {
2035 0 : error = PTR_ERR(handle);
2036 0 : goto out_free;
2037 : }
2038 :
2039 0 : ext4_write_lock_xattr(inode, &no_expand);
2040 0 : if (ext4_has_inline_data(inode))
2041 0 : error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2042 0 : ext4_write_unlock_xattr(inode, &no_expand);
2043 0 : ext4_journal_stop(handle);
2044 0 : out_free:
2045 0 : brelse(iloc.bh);
2046 : return error;
2047 : }
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