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/iversion.h>
10 :
11 : #include "ext4_jbd2.h"
12 : #include "ext4.h"
13 : #include "xattr.h"
14 : #include "truncate.h"
15 :
16 : #define EXT4_XATTR_SYSTEM_DATA "data"
17 : #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
18 : #define EXT4_INLINE_DOTDOT_OFFSET 2
19 : #define EXT4_INLINE_DOTDOT_SIZE 4
20 :
21 0 : static int ext4_get_inline_size(struct inode *inode)
22 : {
23 0 : if (EXT4_I(inode)->i_inline_off)
24 0 : return EXT4_I(inode)->i_inline_size;
25 :
26 : return 0;
27 : }
28 :
29 0 : static int get_max_inline_xattr_value_size(struct inode *inode,
30 : struct ext4_iloc *iloc)
31 : {
32 0 : struct ext4_xattr_ibody_header *header;
33 0 : struct ext4_xattr_entry *entry;
34 0 : struct ext4_inode *raw_inode;
35 0 : int free, min_offs;
36 :
37 0 : min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
38 0 : EXT4_GOOD_OLD_INODE_SIZE -
39 0 : EXT4_I(inode)->i_extra_isize -
40 : sizeof(struct ext4_xattr_ibody_header);
41 :
42 : /*
43 : * We need to subtract another sizeof(__u32) since an in-inode xattr
44 : * needs an empty 4 bytes to indicate the gap between the xattr entry
45 : * and the name/value pair.
46 : */
47 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
48 0 : return EXT4_XATTR_SIZE(min_offs -
49 : EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
50 : EXT4_XATTR_ROUND - sizeof(__u32));
51 :
52 0 : raw_inode = ext4_raw_inode(iloc);
53 0 : header = IHDR(inode, raw_inode);
54 0 : entry = IFIRST(header);
55 :
56 : /* Compute min_offs. */
57 0 : for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
58 0 : if (!entry->e_value_inum && entry->e_value_size) {
59 0 : size_t offs = le16_to_cpu(entry->e_value_offs);
60 0 : if (offs < min_offs)
61 0 : min_offs = offs;
62 : }
63 : }
64 0 : free = min_offs -
65 0 : ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
66 :
67 0 : if (EXT4_I(inode)->i_inline_off) {
68 0 : entry = (struct ext4_xattr_entry *)
69 0 : ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
70 :
71 0 : free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
72 0 : goto out;
73 : }
74 :
75 0 : free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
76 :
77 0 : if (free > EXT4_XATTR_ROUND)
78 0 : free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
79 : else
80 : free = 0;
81 :
82 : out:
83 : return free;
84 : }
85 :
86 : /*
87 : * Get the maximum size we now can store in an inode.
88 : * If we can't find the space for a xattr entry, don't use the space
89 : * of the extents since we have no space to indicate the inline data.
90 : */
91 0 : int ext4_get_max_inline_size(struct inode *inode)
92 : {
93 0 : int error, max_inline_size;
94 0 : struct ext4_iloc iloc;
95 :
96 0 : if (EXT4_I(inode)->i_extra_isize == 0)
97 : return 0;
98 :
99 0 : error = ext4_get_inode_loc(inode, &iloc);
100 0 : if (error) {
101 0 : ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
102 : "can't get inode location %lu",
103 : inode->i_ino);
104 0 : return 0;
105 : }
106 :
107 0 : down_read(&EXT4_I(inode)->xattr_sem);
108 0 : max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
109 0 : up_read(&EXT4_I(inode)->xattr_sem);
110 :
111 0 : brelse(iloc.bh);
112 :
113 0 : if (!max_inline_size)
114 : return 0;
115 :
116 0 : return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
117 : }
118 :
119 : /*
120 : * this function does not take xattr_sem, which is OK because it is
121 : * currently only used in a code path coming form ext4_iget, before
122 : * the new inode has been unlocked
123 : */
124 0 : int ext4_find_inline_data_nolock(struct inode *inode)
125 : {
126 0 : struct ext4_xattr_ibody_find is = {
127 : .s = { .not_found = -ENODATA, },
128 : };
129 0 : struct ext4_xattr_info i = {
130 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
131 : .name = EXT4_XATTR_SYSTEM_DATA,
132 : };
133 0 : int error;
134 :
135 0 : if (EXT4_I(inode)->i_extra_isize == 0)
136 : return 0;
137 :
138 0 : error = ext4_get_inode_loc(inode, &is.iloc);
139 0 : if (error)
140 : return error;
141 :
142 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
143 0 : if (error)
144 0 : goto out;
145 :
146 0 : if (!is.s.not_found) {
147 0 : if (is.s.here->e_value_inum) {
148 0 : EXT4_ERROR_INODE(inode, "inline data xattr refers "
149 : "to an external xattr inode");
150 0 : error = -EFSCORRUPTED;
151 0 : goto out;
152 : }
153 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
154 0 : (void *)ext4_raw_inode(&is.iloc));
155 0 : EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
156 0 : le32_to_cpu(is.s.here->e_value_size);
157 0 : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
158 : }
159 0 : out:
160 0 : brelse(is.iloc.bh);
161 : return error;
162 : }
163 :
164 0 : static int ext4_read_inline_data(struct inode *inode, void *buffer,
165 : unsigned int len,
166 : struct ext4_iloc *iloc)
167 : {
168 0 : struct ext4_xattr_entry *entry;
169 0 : struct ext4_xattr_ibody_header *header;
170 0 : int cp_len = 0;
171 0 : struct ext4_inode *raw_inode;
172 :
173 0 : if (!len)
174 : return 0;
175 :
176 0 : BUG_ON(len > EXT4_I(inode)->i_inline_size);
177 :
178 0 : cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
179 0 : len : EXT4_MIN_INLINE_DATA_SIZE;
180 :
181 0 : raw_inode = ext4_raw_inode(iloc);
182 0 : memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
183 :
184 0 : len -= cp_len;
185 0 : buffer += cp_len;
186 :
187 0 : if (!len)
188 0 : goto out;
189 :
190 0 : header = IHDR(inode, raw_inode);
191 0 : entry = (struct ext4_xattr_entry *)((void *)raw_inode +
192 0 : EXT4_I(inode)->i_inline_off);
193 0 : len = min_t(unsigned int, len,
194 : (unsigned int)le32_to_cpu(entry->e_value_size));
195 :
196 0 : memcpy(buffer,
197 0 : (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
198 0 : cp_len += len;
199 :
200 : out:
201 : return cp_len;
202 : }
203 :
204 : /*
205 : * write the buffer to the inline inode.
206 : * If 'create' is set, we don't need to do the extra copy in the xattr
207 : * value since it is already handled by ext4_xattr_ibody_inline_set.
208 : * That saves us one memcpy.
209 : */
210 0 : static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
211 : void *buffer, loff_t pos, unsigned int len)
212 : {
213 0 : struct ext4_xattr_entry *entry;
214 0 : struct ext4_xattr_ibody_header *header;
215 0 : struct ext4_inode *raw_inode;
216 0 : int cp_len = 0;
217 :
218 0 : if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
219 : return;
220 :
221 0 : BUG_ON(!EXT4_I(inode)->i_inline_off);
222 0 : BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
223 :
224 0 : raw_inode = ext4_raw_inode(iloc);
225 0 : buffer += pos;
226 :
227 0 : if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
228 0 : cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
229 0 : EXT4_MIN_INLINE_DATA_SIZE - pos : len;
230 0 : memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
231 :
232 0 : len -= cp_len;
233 0 : buffer += cp_len;
234 0 : pos += cp_len;
235 : }
236 :
237 0 : if (!len)
238 : return;
239 :
240 0 : pos -= EXT4_MIN_INLINE_DATA_SIZE;
241 0 : header = IHDR(inode, raw_inode);
242 0 : entry = (struct ext4_xattr_entry *)((void *)raw_inode +
243 0 : EXT4_I(inode)->i_inline_off);
244 :
245 0 : memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
246 : buffer, len);
247 : }
248 :
249 0 : static int ext4_create_inline_data(handle_t *handle,
250 : struct inode *inode, unsigned len)
251 : {
252 0 : int error;
253 0 : void *value = NULL;
254 0 : struct ext4_xattr_ibody_find is = {
255 : .s = { .not_found = -ENODATA, },
256 : };
257 0 : struct ext4_xattr_info i = {
258 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
259 : .name = EXT4_XATTR_SYSTEM_DATA,
260 : };
261 :
262 0 : error = ext4_get_inode_loc(inode, &is.iloc);
263 0 : if (error)
264 : return error;
265 :
266 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
267 0 : error = ext4_journal_get_write_access(handle, is.iloc.bh);
268 0 : if (error)
269 0 : goto out;
270 :
271 0 : if (len > EXT4_MIN_INLINE_DATA_SIZE) {
272 0 : value = EXT4_ZERO_XATTR_VALUE;
273 0 : len -= EXT4_MIN_INLINE_DATA_SIZE;
274 : } else {
275 : value = "";
276 : len = 0;
277 : }
278 :
279 : /* Insert the xttr entry. */
280 0 : i.value = value;
281 0 : i.value_len = len;
282 :
283 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
284 0 : if (error)
285 0 : goto out;
286 :
287 0 : BUG_ON(!is.s.not_found);
288 :
289 0 : error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
290 0 : if (error) {
291 0 : if (error == -ENOSPC)
292 0 : ext4_clear_inode_state(inode,
293 : EXT4_STATE_MAY_INLINE_DATA);
294 0 : goto out;
295 : }
296 :
297 0 : memset((void *)ext4_raw_inode(&is.iloc)->i_block,
298 : 0, EXT4_MIN_INLINE_DATA_SIZE);
299 :
300 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
301 0 : (void *)ext4_raw_inode(&is.iloc));
302 0 : EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
303 0 : ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
304 0 : ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
305 0 : get_bh(is.iloc.bh);
306 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
307 :
308 0 : out:
309 0 : brelse(is.iloc.bh);
310 : return error;
311 : }
312 :
313 0 : static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
314 : unsigned int len)
315 : {
316 0 : int error;
317 0 : void *value = NULL;
318 0 : struct ext4_xattr_ibody_find is = {
319 : .s = { .not_found = -ENODATA, },
320 : };
321 0 : struct ext4_xattr_info i = {
322 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
323 : .name = EXT4_XATTR_SYSTEM_DATA,
324 : };
325 :
326 : /* If the old space is ok, write the data directly. */
327 0 : if (len <= EXT4_I(inode)->i_inline_size)
328 : return 0;
329 :
330 0 : error = ext4_get_inode_loc(inode, &is.iloc);
331 0 : if (error)
332 : return error;
333 :
334 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
335 0 : if (error)
336 0 : goto out;
337 :
338 0 : BUG_ON(is.s.not_found);
339 :
340 0 : len -= EXT4_MIN_INLINE_DATA_SIZE;
341 0 : value = kzalloc(len, GFP_NOFS);
342 0 : if (!value) {
343 0 : error = -ENOMEM;
344 0 : goto out;
345 : }
346 :
347 0 : error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
348 : value, len);
349 0 : if (error == -ENODATA)
350 0 : goto out;
351 :
352 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
353 0 : error = ext4_journal_get_write_access(handle, is.iloc.bh);
354 0 : if (error)
355 0 : goto out;
356 :
357 : /* Update the xattr entry. */
358 0 : i.value = value;
359 0 : i.value_len = len;
360 :
361 0 : error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
362 0 : if (error)
363 0 : goto out;
364 :
365 0 : EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
366 0 : (void *)ext4_raw_inode(&is.iloc));
367 0 : EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
368 0 : le32_to_cpu(is.s.here->e_value_size);
369 0 : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
370 0 : get_bh(is.iloc.bh);
371 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
372 :
373 0 : out:
374 0 : kfree(value);
375 0 : brelse(is.iloc.bh);
376 : return error;
377 : }
378 :
379 0 : static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
380 : unsigned int len)
381 : {
382 0 : int ret, size, no_expand;
383 0 : struct ext4_inode_info *ei = EXT4_I(inode);
384 :
385 0 : if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
386 : return -ENOSPC;
387 :
388 0 : size = ext4_get_max_inline_size(inode);
389 0 : if (size < len)
390 : return -ENOSPC;
391 :
392 0 : ext4_write_lock_xattr(inode, &no_expand);
393 :
394 0 : if (ei->i_inline_off)
395 0 : ret = ext4_update_inline_data(handle, inode, len);
396 : else
397 0 : ret = ext4_create_inline_data(handle, inode, len);
398 :
399 0 : ext4_write_unlock_xattr(inode, &no_expand);
400 0 : return ret;
401 : }
402 :
403 0 : static int ext4_destroy_inline_data_nolock(handle_t *handle,
404 : struct inode *inode)
405 : {
406 0 : struct ext4_inode_info *ei = EXT4_I(inode);
407 0 : struct ext4_xattr_ibody_find is = {
408 : .s = { .not_found = 0, },
409 : };
410 0 : struct ext4_xattr_info i = {
411 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
412 : .name = EXT4_XATTR_SYSTEM_DATA,
413 : .value = NULL,
414 : .value_len = 0,
415 : };
416 0 : int error;
417 :
418 0 : if (!ei->i_inline_off)
419 : return 0;
420 :
421 0 : error = ext4_get_inode_loc(inode, &is.iloc);
422 0 : if (error)
423 : return error;
424 :
425 0 : error = ext4_xattr_ibody_find(inode, &i, &is);
426 0 : if (error)
427 0 : goto out;
428 :
429 0 : BUFFER_TRACE(is.iloc.bh, "get_write_access");
430 0 : error = ext4_journal_get_write_access(handle, is.iloc.bh);
431 0 : if (error)
432 0 : goto out;
433 :
434 0 : error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
435 0 : if (error)
436 0 : goto out;
437 :
438 0 : memset((void *)ext4_raw_inode(&is.iloc)->i_block,
439 : 0, EXT4_MIN_INLINE_DATA_SIZE);
440 0 : memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
441 :
442 0 : if (ext4_has_feature_extents(inode->i_sb)) {
443 0 : if (S_ISDIR(inode->i_mode) ||
444 0 : S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
445 0 : ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
446 0 : ext4_ext_tree_init(handle, inode);
447 : }
448 : }
449 0 : ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
450 :
451 0 : get_bh(is.iloc.bh);
452 0 : error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
453 :
454 0 : EXT4_I(inode)->i_inline_off = 0;
455 0 : EXT4_I(inode)->i_inline_size = 0;
456 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
457 0 : out:
458 0 : brelse(is.iloc.bh);
459 0 : if (error == -ENODATA)
460 0 : error = 0;
461 : return error;
462 : }
463 :
464 0 : static int ext4_read_inline_page(struct inode *inode, struct page *page)
465 : {
466 0 : void *kaddr;
467 0 : int ret = 0;
468 0 : size_t len;
469 0 : struct ext4_iloc iloc;
470 :
471 0 : BUG_ON(!PageLocked(page));
472 0 : BUG_ON(!ext4_has_inline_data(inode));
473 0 : BUG_ON(page->index);
474 :
475 0 : if (!EXT4_I(inode)->i_inline_off) {
476 0 : ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
477 : inode->i_ino);
478 0 : goto out;
479 : }
480 :
481 0 : ret = ext4_get_inode_loc(inode, &iloc);
482 0 : if (ret)
483 0 : goto out;
484 :
485 0 : len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
486 0 : kaddr = kmap_atomic(page);
487 0 : ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
488 0 : flush_dcache_page(page);
489 0 : kunmap_atomic(kaddr);
490 0 : zero_user_segment(page, len, PAGE_SIZE);
491 0 : SetPageUptodate(page);
492 0 : brelse(iloc.bh);
493 :
494 0 : out:
495 0 : return ret;
496 : }
497 :
498 0 : int ext4_readpage_inline(struct inode *inode, struct page *page)
499 : {
500 0 : int ret = 0;
501 :
502 0 : down_read(&EXT4_I(inode)->xattr_sem);
503 0 : if (!ext4_has_inline_data(inode)) {
504 0 : up_read(&EXT4_I(inode)->xattr_sem);
505 0 : return -EAGAIN;
506 : }
507 :
508 : /*
509 : * Current inline data can only exist in the 1st page,
510 : * So for all the other pages, just set them uptodate.
511 : */
512 0 : if (!page->index)
513 0 : ret = ext4_read_inline_page(inode, page);
514 0 : else if (!PageUptodate(page)) {
515 0 : zero_user_segment(page, 0, PAGE_SIZE);
516 0 : SetPageUptodate(page);
517 : }
518 :
519 0 : up_read(&EXT4_I(inode)->xattr_sem);
520 :
521 0 : unlock_page(page);
522 0 : return ret >= 0 ? 0 : ret;
523 : }
524 :
525 0 : static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
526 : struct inode *inode,
527 : unsigned flags)
528 : {
529 0 : int ret, needed_blocks, no_expand;
530 0 : handle_t *handle = NULL;
531 0 : int retries = 0, sem_held = 0;
532 0 : struct page *page = NULL;
533 0 : unsigned from, to;
534 0 : struct ext4_iloc iloc;
535 :
536 0 : if (!ext4_has_inline_data(inode)) {
537 : /*
538 : * clear the flag so that no new write
539 : * will trap here again.
540 : */
541 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
542 0 : return 0;
543 : }
544 :
545 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
546 :
547 0 : ret = ext4_get_inode_loc(inode, &iloc);
548 0 : if (ret)
549 : return ret;
550 :
551 0 : retry:
552 0 : handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
553 0 : if (IS_ERR(handle)) {
554 0 : ret = PTR_ERR(handle);
555 0 : handle = NULL;
556 0 : goto out;
557 : }
558 :
559 : /* We cannot recurse into the filesystem as the transaction is already
560 : * started */
561 0 : flags |= AOP_FLAG_NOFS;
562 :
563 0 : page = grab_cache_page_write_begin(mapping, 0, flags);
564 0 : if (!page) {
565 0 : ret = -ENOMEM;
566 0 : goto out;
567 : }
568 :
569 0 : ext4_write_lock_xattr(inode, &no_expand);
570 0 : sem_held = 1;
571 : /* If some one has already done this for us, just exit. */
572 0 : if (!ext4_has_inline_data(inode)) {
573 0 : ret = 0;
574 0 : goto out;
575 : }
576 :
577 0 : from = 0;
578 0 : to = ext4_get_inline_size(inode);
579 0 : if (!PageUptodate(page)) {
580 0 : ret = ext4_read_inline_page(inode, page);
581 0 : if (ret < 0)
582 0 : goto out;
583 : }
584 :
585 0 : ret = ext4_destroy_inline_data_nolock(handle, inode);
586 0 : if (ret)
587 0 : goto out;
588 :
589 0 : if (ext4_should_dioread_nolock(inode)) {
590 0 : ret = __block_write_begin(page, from, to,
591 : ext4_get_block_unwritten);
592 : } else
593 0 : ret = __block_write_begin(page, from, to, ext4_get_block);
594 :
595 0 : if (!ret && ext4_should_journal_data(inode)) {
596 0 : ret = ext4_walk_page_buffers(handle, page_buffers(page),
597 : from, to, NULL,
598 : do_journal_get_write_access);
599 : }
600 :
601 0 : if (ret) {
602 0 : unlock_page(page);
603 0 : put_page(page);
604 0 : page = NULL;
605 0 : ext4_orphan_add(handle, inode);
606 0 : ext4_write_unlock_xattr(inode, &no_expand);
607 0 : sem_held = 0;
608 0 : ext4_journal_stop(handle);
609 0 : handle = NULL;
610 0 : ext4_truncate_failed_write(inode);
611 : /*
612 : * If truncate failed early the inode might
613 : * still be on the orphan list; we need to
614 : * make sure the inode is removed from the
615 : * orphan list in that case.
616 : */
617 0 : if (inode->i_nlink)
618 0 : ext4_orphan_del(NULL, inode);
619 : }
620 :
621 0 : if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
622 0 : goto retry;
623 :
624 0 : if (page)
625 0 : block_commit_write(page, from, to);
626 0 : out:
627 0 : if (page) {
628 0 : unlock_page(page);
629 0 : put_page(page);
630 : }
631 0 : if (sem_held)
632 0 : ext4_write_unlock_xattr(inode, &no_expand);
633 0 : if (handle)
634 0 : ext4_journal_stop(handle);
635 0 : brelse(iloc.bh);
636 : return ret;
637 : }
638 :
639 : /*
640 : * Try to write data in the inode.
641 : * If the inode has inline data, check whether the new write can be
642 : * in the inode also. If not, create the page the handle, move the data
643 : * to the page make it update and let the later codes create extent for it.
644 : */
645 0 : int ext4_try_to_write_inline_data(struct address_space *mapping,
646 : struct inode *inode,
647 : loff_t pos, unsigned len,
648 : unsigned flags,
649 : struct page **pagep)
650 : {
651 0 : int ret;
652 0 : handle_t *handle;
653 0 : struct page *page;
654 0 : struct ext4_iloc iloc;
655 :
656 0 : if (pos + len > ext4_get_max_inline_size(inode))
657 0 : goto convert;
658 :
659 0 : ret = ext4_get_inode_loc(inode, &iloc);
660 0 : if (ret)
661 : return ret;
662 :
663 : /*
664 : * The possible write could happen in the inode,
665 : * so try to reserve the space in inode first.
666 : */
667 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
668 0 : if (IS_ERR(handle)) {
669 0 : ret = PTR_ERR(handle);
670 0 : handle = NULL;
671 0 : goto out;
672 : }
673 :
674 0 : ret = ext4_prepare_inline_data(handle, inode, pos + len);
675 0 : if (ret && ret != -ENOSPC)
676 0 : goto out;
677 :
678 : /* We don't have space in inline inode, so convert it to extent. */
679 0 : if (ret == -ENOSPC) {
680 0 : ext4_journal_stop(handle);
681 0 : brelse(iloc.bh);
682 0 : goto convert;
683 : }
684 :
685 0 : ret = ext4_journal_get_write_access(handle, iloc.bh);
686 0 : if (ret)
687 0 : goto out;
688 :
689 0 : flags |= AOP_FLAG_NOFS;
690 :
691 0 : page = grab_cache_page_write_begin(mapping, 0, flags);
692 0 : if (!page) {
693 0 : ret = -ENOMEM;
694 0 : goto out;
695 : }
696 :
697 0 : *pagep = page;
698 0 : down_read(&EXT4_I(inode)->xattr_sem);
699 0 : if (!ext4_has_inline_data(inode)) {
700 0 : ret = 0;
701 0 : unlock_page(page);
702 0 : put_page(page);
703 0 : goto out_up_read;
704 : }
705 :
706 0 : if (!PageUptodate(page)) {
707 0 : ret = ext4_read_inline_page(inode, page);
708 0 : if (ret < 0) {
709 0 : unlock_page(page);
710 0 : put_page(page);
711 0 : goto out_up_read;
712 : }
713 : }
714 :
715 : ret = 1;
716 : handle = NULL;
717 0 : out_up_read:
718 0 : up_read(&EXT4_I(inode)->xattr_sem);
719 0 : out:
720 0 : if (handle && (ret != 1))
721 0 : ext4_journal_stop(handle);
722 0 : brelse(iloc.bh);
723 : return ret;
724 0 : convert:
725 0 : return ext4_convert_inline_data_to_extent(mapping,
726 : inode, flags);
727 : }
728 :
729 0 : int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
730 : unsigned copied, struct page *page)
731 : {
732 0 : int ret, no_expand;
733 0 : void *kaddr;
734 0 : struct ext4_iloc iloc;
735 :
736 0 : if (unlikely(copied < len)) {
737 0 : if (!PageUptodate(page)) {
738 0 : copied = 0;
739 0 : goto out;
740 : }
741 : }
742 :
743 0 : ret = ext4_get_inode_loc(inode, &iloc);
744 0 : if (ret) {
745 0 : ext4_std_error(inode->i_sb, ret);
746 0 : copied = 0;
747 0 : goto out;
748 : }
749 :
750 0 : ext4_write_lock_xattr(inode, &no_expand);
751 0 : BUG_ON(!ext4_has_inline_data(inode));
752 :
753 0 : kaddr = kmap_atomic(page);
754 0 : ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
755 0 : kunmap_atomic(kaddr);
756 0 : SetPageUptodate(page);
757 : /* clear page dirty so that writepages wouldn't work for us. */
758 0 : ClearPageDirty(page);
759 :
760 0 : ext4_write_unlock_xattr(inode, &no_expand);
761 0 : brelse(iloc.bh);
762 0 : mark_inode_dirty(inode);
763 0 : out:
764 0 : return copied;
765 : }
766 :
767 : struct buffer_head *
768 0 : ext4_journalled_write_inline_data(struct inode *inode,
769 : unsigned len,
770 : struct page *page)
771 : {
772 0 : int ret, no_expand;
773 0 : void *kaddr;
774 0 : struct ext4_iloc iloc;
775 :
776 0 : ret = ext4_get_inode_loc(inode, &iloc);
777 0 : if (ret) {
778 0 : ext4_std_error(inode->i_sb, ret);
779 0 : return NULL;
780 : }
781 :
782 0 : ext4_write_lock_xattr(inode, &no_expand);
783 0 : kaddr = kmap_atomic(page);
784 0 : ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
785 0 : kunmap_atomic(kaddr);
786 0 : ext4_write_unlock_xattr(inode, &no_expand);
787 :
788 0 : return iloc.bh;
789 : }
790 :
791 : /*
792 : * Try to make the page cache and handle ready for the inline data case.
793 : * We can call this function in 2 cases:
794 : * 1. The inode is created and the first write exceeds inline size. We can
795 : * clear the inode state safely.
796 : * 2. The inode has inline data, then we need to read the data, make it
797 : * update and dirty so that ext4_da_writepages can handle it. We don't
798 : * need to start the journal since the file's metatdata isn't changed now.
799 : */
800 0 : static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
801 : struct inode *inode,
802 : unsigned flags,
803 : void **fsdata)
804 : {
805 0 : int ret = 0, inline_size;
806 0 : struct page *page;
807 :
808 0 : page = grab_cache_page_write_begin(mapping, 0, flags);
809 0 : if (!page)
810 : return -ENOMEM;
811 :
812 0 : down_read(&EXT4_I(inode)->xattr_sem);
813 0 : if (!ext4_has_inline_data(inode)) {
814 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
815 0 : goto out;
816 : }
817 :
818 0 : inline_size = ext4_get_inline_size(inode);
819 :
820 0 : if (!PageUptodate(page)) {
821 0 : ret = ext4_read_inline_page(inode, page);
822 0 : if (ret < 0)
823 0 : goto out;
824 : }
825 :
826 0 : ret = __block_write_begin(page, 0, inline_size,
827 : ext4_da_get_block_prep);
828 0 : if (ret) {
829 0 : up_read(&EXT4_I(inode)->xattr_sem);
830 0 : unlock_page(page);
831 0 : put_page(page);
832 0 : ext4_truncate_failed_write(inode);
833 0 : return ret;
834 : }
835 :
836 0 : SetPageDirty(page);
837 0 : SetPageUptodate(page);
838 0 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
839 0 : *fsdata = (void *)CONVERT_INLINE_DATA;
840 :
841 0 : out:
842 0 : up_read(&EXT4_I(inode)->xattr_sem);
843 0 : if (page) {
844 0 : unlock_page(page);
845 0 : put_page(page);
846 : }
847 0 : return ret;
848 : }
849 :
850 : /*
851 : * Prepare the write for the inline data.
852 : * If the data can be written into the inode, we just read
853 : * the page and make it uptodate, and start the journal.
854 : * Otherwise read the page, makes it dirty so that it can be
855 : * handle in writepages(the i_disksize update is left to the
856 : * normal ext4_da_write_end).
857 : */
858 0 : int ext4_da_write_inline_data_begin(struct address_space *mapping,
859 : struct inode *inode,
860 : loff_t pos, unsigned len,
861 : unsigned flags,
862 : struct page **pagep,
863 : void **fsdata)
864 : {
865 0 : int ret, inline_size;
866 0 : handle_t *handle;
867 0 : struct page *page;
868 0 : struct ext4_iloc iloc;
869 0 : int retries = 0;
870 :
871 0 : ret = ext4_get_inode_loc(inode, &iloc);
872 0 : if (ret)
873 : return ret;
874 :
875 0 : retry_journal:
876 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
877 0 : if (IS_ERR(handle)) {
878 0 : ret = PTR_ERR(handle);
879 0 : goto out;
880 : }
881 :
882 0 : inline_size = ext4_get_max_inline_size(inode);
883 :
884 0 : ret = -ENOSPC;
885 0 : if (inline_size >= pos + len) {
886 0 : ret = ext4_prepare_inline_data(handle, inode, pos + len);
887 0 : if (ret && ret != -ENOSPC)
888 0 : goto out_journal;
889 : }
890 :
891 : /*
892 : * We cannot recurse into the filesystem as the transaction
893 : * is already started.
894 : */
895 0 : flags |= AOP_FLAG_NOFS;
896 :
897 0 : if (ret == -ENOSPC) {
898 0 : ext4_journal_stop(handle);
899 0 : ret = ext4_da_convert_inline_data_to_extent(mapping,
900 : inode,
901 : flags,
902 : fsdata);
903 0 : if (ret == -ENOSPC &&
904 0 : ext4_should_retry_alloc(inode->i_sb, &retries))
905 0 : goto retry_journal;
906 0 : goto out;
907 : }
908 :
909 0 : page = grab_cache_page_write_begin(mapping, 0, flags);
910 0 : if (!page) {
911 0 : ret = -ENOMEM;
912 0 : goto out_journal;
913 : }
914 :
915 0 : down_read(&EXT4_I(inode)->xattr_sem);
916 0 : if (!ext4_has_inline_data(inode)) {
917 0 : ret = 0;
918 0 : goto out_release_page;
919 : }
920 :
921 0 : if (!PageUptodate(page)) {
922 0 : ret = ext4_read_inline_page(inode, page);
923 0 : if (ret < 0)
924 0 : goto out_release_page;
925 : }
926 0 : ret = ext4_journal_get_write_access(handle, iloc.bh);
927 0 : if (ret)
928 0 : goto out_release_page;
929 :
930 0 : up_read(&EXT4_I(inode)->xattr_sem);
931 0 : *pagep = page;
932 0 : brelse(iloc.bh);
933 : return 1;
934 0 : out_release_page:
935 0 : up_read(&EXT4_I(inode)->xattr_sem);
936 0 : unlock_page(page);
937 0 : put_page(page);
938 0 : out_journal:
939 0 : ext4_journal_stop(handle);
940 0 : out:
941 0 : brelse(iloc.bh);
942 : return ret;
943 : }
944 :
945 0 : int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
946 : unsigned len, unsigned copied,
947 : struct page *page)
948 : {
949 0 : int ret;
950 :
951 0 : ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
952 0 : if (ret < 0) {
953 0 : unlock_page(page);
954 0 : put_page(page);
955 0 : return ret;
956 : }
957 0 : copied = ret;
958 :
959 : /*
960 : * No need to use i_size_read() here, the i_size
961 : * cannot change under us because we hold i_mutex.
962 : *
963 : * But it's important to update i_size while still holding page lock:
964 : * page writeout could otherwise come in and zero beyond i_size.
965 : */
966 0 : if (pos+copied > inode->i_size)
967 0 : i_size_write(inode, pos+copied);
968 0 : unlock_page(page);
969 0 : put_page(page);
970 :
971 : /*
972 : * Don't mark the inode dirty under page lock. First, it unnecessarily
973 : * makes the holding time of page lock longer. Second, it forces lock
974 : * ordering of page lock and transaction start for journaling
975 : * filesystems.
976 : */
977 0 : mark_inode_dirty(inode);
978 :
979 0 : return copied;
980 : }
981 :
982 : #ifdef INLINE_DIR_DEBUG
983 : void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
984 : void *inline_start, int inline_size)
985 : {
986 : int offset;
987 : unsigned short de_len;
988 : struct ext4_dir_entry_2 *de = inline_start;
989 : void *dlimit = inline_start + inline_size;
990 :
991 : trace_printk("inode %lu\n", dir->i_ino);
992 : offset = 0;
993 : while ((void *)de < dlimit) {
994 : de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
995 : trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
996 : offset, de_len, de->name_len, de->name,
997 : de->name_len, le32_to_cpu(de->inode));
998 : if (ext4_check_dir_entry(dir, NULL, de, bh,
999 : inline_start, inline_size, offset))
1000 : BUG();
1001 :
1002 : offset += de_len;
1003 : de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1004 : }
1005 : }
1006 : #else
1007 : #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1008 : #endif
1009 :
1010 : /*
1011 : * Add a new entry into a inline dir.
1012 : * It will return -ENOSPC if no space is available, and -EIO
1013 : * and -EEXIST if directory entry already exists.
1014 : */
1015 0 : static int ext4_add_dirent_to_inline(handle_t *handle,
1016 : struct ext4_filename *fname,
1017 : struct inode *dir,
1018 : struct inode *inode,
1019 : struct ext4_iloc *iloc,
1020 : void *inline_start, int inline_size)
1021 : {
1022 0 : int err;
1023 0 : struct ext4_dir_entry_2 *de;
1024 :
1025 0 : err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1026 : inline_size, fname, &de);
1027 0 : if (err)
1028 : return err;
1029 :
1030 0 : BUFFER_TRACE(iloc->bh, "get_write_access");
1031 0 : err = ext4_journal_get_write_access(handle, iloc->bh);
1032 0 : if (err)
1033 : return err;
1034 0 : ext4_insert_dentry(inode, de, inline_size, fname);
1035 :
1036 0 : ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1037 :
1038 : /*
1039 : * XXX shouldn't update any times until successful
1040 : * completion of syscall, but too many callers depend
1041 : * on this.
1042 : *
1043 : * XXX similarly, too many callers depend on
1044 : * ext4_new_inode() setting the times, but error
1045 : * recovery deletes the inode, so the worst that can
1046 : * happen is that the times are slightly out of date
1047 : * and/or different from the directory change time.
1048 : */
1049 0 : dir->i_mtime = dir->i_ctime = current_time(dir);
1050 0 : ext4_update_dx_flag(dir);
1051 0 : inode_inc_iversion(dir);
1052 0 : return 1;
1053 : }
1054 :
1055 0 : static void *ext4_get_inline_xattr_pos(struct inode *inode,
1056 : struct ext4_iloc *iloc)
1057 : {
1058 0 : struct ext4_xattr_entry *entry;
1059 0 : struct ext4_xattr_ibody_header *header;
1060 :
1061 0 : BUG_ON(!EXT4_I(inode)->i_inline_off);
1062 :
1063 0 : header = IHDR(inode, ext4_raw_inode(iloc));
1064 0 : entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1065 0 : EXT4_I(inode)->i_inline_off);
1066 :
1067 0 : return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1068 : }
1069 :
1070 : /* Set the final de to cover the whole block. */
1071 0 : static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1072 : {
1073 0 : struct ext4_dir_entry_2 *de, *prev_de;
1074 0 : void *limit;
1075 0 : int de_len;
1076 :
1077 0 : de = (struct ext4_dir_entry_2 *)de_buf;
1078 0 : if (old_size) {
1079 0 : limit = de_buf + old_size;
1080 0 : do {
1081 0 : prev_de = de;
1082 0 : de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1083 0 : de_buf += de_len;
1084 0 : de = (struct ext4_dir_entry_2 *)de_buf;
1085 0 : } while (de_buf < limit);
1086 :
1087 0 : prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1088 : old_size, new_size);
1089 : } else {
1090 : /* this is just created, so create an empty entry. */
1091 0 : de->inode = 0;
1092 0 : de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1093 : }
1094 0 : }
1095 :
1096 0 : static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1097 : struct ext4_iloc *iloc)
1098 : {
1099 0 : int ret;
1100 0 : int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1101 0 : int new_size = get_max_inline_xattr_value_size(dir, iloc);
1102 :
1103 0 : if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1104 : return -ENOSPC;
1105 :
1106 0 : ret = ext4_update_inline_data(handle, dir,
1107 : new_size + EXT4_MIN_INLINE_DATA_SIZE);
1108 0 : if (ret)
1109 : return ret;
1110 :
1111 0 : ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1112 0 : EXT4_I(dir)->i_inline_size -
1113 : EXT4_MIN_INLINE_DATA_SIZE);
1114 0 : dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1115 0 : return 0;
1116 : }
1117 :
1118 0 : static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1119 : struct ext4_iloc *iloc,
1120 : void *buf, int inline_size)
1121 : {
1122 0 : ext4_create_inline_data(handle, inode, inline_size);
1123 0 : ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1124 0 : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1125 0 : }
1126 :
1127 0 : static int ext4_finish_convert_inline_dir(handle_t *handle,
1128 : struct inode *inode,
1129 : struct buffer_head *dir_block,
1130 : void *buf,
1131 : int inline_size)
1132 : {
1133 0 : int err, csum_size = 0, header_size = 0;
1134 0 : struct ext4_dir_entry_2 *de;
1135 0 : void *target = dir_block->b_data;
1136 :
1137 : /*
1138 : * First create "." and ".." and then copy the dir information
1139 : * back to the block.
1140 : */
1141 0 : de = (struct ext4_dir_entry_2 *)target;
1142 0 : de = ext4_init_dot_dotdot(inode, de,
1143 0 : inode->i_sb->s_blocksize, csum_size,
1144 0 : le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1145 0 : header_size = (void *)de - target;
1146 :
1147 0 : memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1148 0 : inline_size - EXT4_INLINE_DOTDOT_SIZE);
1149 :
1150 0 : if (ext4_has_metadata_csum(inode->i_sb))
1151 0 : csum_size = sizeof(struct ext4_dir_entry_tail);
1152 :
1153 0 : inode->i_size = inode->i_sb->s_blocksize;
1154 0 : i_size_write(inode, inode->i_sb->s_blocksize);
1155 0 : EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1156 0 : ext4_update_final_de(dir_block->b_data,
1157 0 : inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1158 0 : inode->i_sb->s_blocksize - csum_size);
1159 :
1160 0 : if (csum_size)
1161 0 : ext4_initialize_dirent_tail(dir_block,
1162 0 : inode->i_sb->s_blocksize);
1163 0 : set_buffer_uptodate(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, data_bh);
1227 0 : if (error) {
1228 0 : unlock_buffer(data_bh);
1229 0 : error = -EIO;
1230 0 : goto out_restore;
1231 : }
1232 0 : memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1233 :
1234 0 : if (!S_ISDIR(inode->i_mode)) {
1235 0 : memcpy(data_bh->b_data, buf, inline_size);
1236 0 : set_buffer_uptodate(data_bh);
1237 0 : error = ext4_handle_dirty_metadata(handle,
1238 : inode, data_bh);
1239 : } else {
1240 0 : error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1241 : buf, inline_size);
1242 : }
1243 :
1244 0 : unlock_buffer(data_bh);
1245 0 : out_restore:
1246 0 : if (error)
1247 0 : ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1248 :
1249 0 : out:
1250 0 : brelse(data_bh);
1251 0 : kfree(buf);
1252 0 : return error;
1253 : }
1254 :
1255 : /*
1256 : * Try to add the new entry to the inline data.
1257 : * If succeeds, return 0. If not, extended the inline dir and copied data to
1258 : * the new created block.
1259 : */
1260 0 : int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1261 : struct inode *dir, struct inode *inode)
1262 : {
1263 0 : int ret, ret2, inline_size, no_expand;
1264 0 : void *inline_start;
1265 0 : struct ext4_iloc iloc;
1266 :
1267 0 : ret = ext4_get_inode_loc(dir, &iloc);
1268 0 : if (ret)
1269 : return ret;
1270 :
1271 0 : ext4_write_lock_xattr(dir, &no_expand);
1272 0 : if (!ext4_has_inline_data(dir))
1273 0 : goto out;
1274 :
1275 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1276 : EXT4_INLINE_DOTDOT_SIZE;
1277 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1278 :
1279 0 : ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1280 : inline_start, inline_size);
1281 0 : if (ret != -ENOSPC)
1282 0 : goto out;
1283 :
1284 : /* check whether it can be inserted to inline xattr space. */
1285 0 : inline_size = EXT4_I(dir)->i_inline_size -
1286 : EXT4_MIN_INLINE_DATA_SIZE;
1287 0 : if (!inline_size) {
1288 : /* Try to use the xattr space.*/
1289 0 : ret = ext4_update_inline_dir(handle, dir, &iloc);
1290 0 : if (ret && ret != -ENOSPC)
1291 0 : goto out;
1292 :
1293 0 : inline_size = EXT4_I(dir)->i_inline_size -
1294 : EXT4_MIN_INLINE_DATA_SIZE;
1295 : }
1296 :
1297 0 : if (inline_size) {
1298 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1299 :
1300 0 : ret = ext4_add_dirent_to_inline(handle, fname, dir,
1301 : inode, &iloc, inline_start,
1302 : inline_size);
1303 :
1304 0 : if (ret != -ENOSPC)
1305 0 : goto out;
1306 : }
1307 :
1308 : /*
1309 : * The inline space is filled up, so create a new block for it.
1310 : * As the extent tree will be created, we have to save the inline
1311 : * dir first.
1312 : */
1313 0 : ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1314 :
1315 0 : out:
1316 0 : ext4_write_unlock_xattr(dir, &no_expand);
1317 0 : ret2 = ext4_mark_inode_dirty(handle, dir);
1318 0 : if (unlikely(ret2 && !ret))
1319 0 : ret = ret2;
1320 0 : brelse(iloc.bh);
1321 : return ret;
1322 : }
1323 :
1324 : /*
1325 : * This function fills a red-black tree with information from an
1326 : * inlined dir. It returns the number directory entries loaded
1327 : * into the tree. If there is an error it is returned in err.
1328 : */
1329 0 : int ext4_inlinedir_to_tree(struct file *dir_file,
1330 : struct inode *dir, ext4_lblk_t block,
1331 : struct dx_hash_info *hinfo,
1332 : __u32 start_hash, __u32 start_minor_hash,
1333 : int *has_inline_data)
1334 : {
1335 0 : int err = 0, count = 0;
1336 0 : unsigned int parent_ino;
1337 0 : int pos;
1338 0 : struct ext4_dir_entry_2 *de;
1339 0 : struct inode *inode = file_inode(dir_file);
1340 0 : int ret, inline_size = 0;
1341 0 : struct ext4_iloc iloc;
1342 0 : void *dir_buf = NULL;
1343 0 : struct ext4_dir_entry_2 fake;
1344 0 : struct fscrypt_str tmp_str;
1345 :
1346 0 : ret = ext4_get_inode_loc(inode, &iloc);
1347 0 : if (ret)
1348 : return ret;
1349 :
1350 0 : down_read(&EXT4_I(inode)->xattr_sem);
1351 0 : if (!ext4_has_inline_data(inode)) {
1352 0 : up_read(&EXT4_I(inode)->xattr_sem);
1353 0 : *has_inline_data = 0;
1354 0 : goto out;
1355 : }
1356 :
1357 0 : inline_size = ext4_get_inline_size(inode);
1358 0 : dir_buf = kmalloc(inline_size, GFP_NOFS);
1359 0 : if (!dir_buf) {
1360 0 : ret = -ENOMEM;
1361 0 : up_read(&EXT4_I(inode)->xattr_sem);
1362 0 : goto out;
1363 : }
1364 :
1365 0 : ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1366 0 : up_read(&EXT4_I(inode)->xattr_sem);
1367 0 : if (ret < 0)
1368 0 : goto out;
1369 :
1370 0 : pos = 0;
1371 0 : parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1372 0 : while (pos < inline_size) {
1373 : /*
1374 : * As inlined dir doesn't store any information about '.' and
1375 : * only the inode number of '..' is stored, we have to handle
1376 : * them differently.
1377 : */
1378 0 : if (pos == 0) {
1379 0 : fake.inode = cpu_to_le32(inode->i_ino);
1380 0 : fake.name_len = 1;
1381 0 : strcpy(fake.name, ".");
1382 0 : fake.rec_len = ext4_rec_len_to_disk(
1383 : EXT4_DIR_REC_LEN(fake.name_len),
1384 : inline_size);
1385 0 : ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1386 : de = &fake;
1387 : pos = EXT4_INLINE_DOTDOT_OFFSET;
1388 0 : } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1389 0 : fake.inode = cpu_to_le32(parent_ino);
1390 0 : fake.name_len = 2;
1391 0 : strcpy(fake.name, "..");
1392 0 : fake.rec_len = ext4_rec_len_to_disk(
1393 : EXT4_DIR_REC_LEN(fake.name_len),
1394 : inline_size);
1395 0 : ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1396 : de = &fake;
1397 : pos = EXT4_INLINE_DOTDOT_SIZE;
1398 : } else {
1399 0 : de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1400 0 : pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1401 0 : if (ext4_check_dir_entry(inode, dir_file, de,
1402 : iloc.bh, dir_buf,
1403 : inline_size, pos)) {
1404 0 : ret = count;
1405 0 : goto out;
1406 : }
1407 : }
1408 :
1409 0 : ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1410 0 : if ((hinfo->hash < start_hash) ||
1411 0 : ((hinfo->hash == start_hash) &&
1412 0 : (hinfo->minor_hash < start_minor_hash)))
1413 0 : continue;
1414 0 : if (de->inode == 0)
1415 0 : continue;
1416 0 : tmp_str.name = de->name;
1417 0 : tmp_str.len = de->name_len;
1418 0 : err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1419 : hinfo->minor_hash, de, &tmp_str);
1420 0 : if (err) {
1421 0 : ret = err;
1422 0 : goto out;
1423 : }
1424 0 : count++;
1425 : }
1426 : ret = count;
1427 0 : out:
1428 0 : kfree(dir_buf);
1429 0 : brelse(iloc.bh);
1430 : return ret;
1431 : }
1432 :
1433 : /*
1434 : * So this function is called when the volume is mkfsed with
1435 : * dir_index disabled. In order to keep f_pos persistent
1436 : * after we convert from an inlined dir to a blocked based,
1437 : * we just pretend that we are a normal dir and return the
1438 : * offset as if '.' and '..' really take place.
1439 : *
1440 : */
1441 0 : int ext4_read_inline_dir(struct file *file,
1442 : struct dir_context *ctx,
1443 : int *has_inline_data)
1444 : {
1445 0 : unsigned int offset, parent_ino;
1446 0 : int i;
1447 0 : struct ext4_dir_entry_2 *de;
1448 0 : struct super_block *sb;
1449 0 : struct inode *inode = file_inode(file);
1450 0 : int ret, inline_size = 0;
1451 0 : struct ext4_iloc iloc;
1452 0 : void *dir_buf = NULL;
1453 0 : int dotdot_offset, dotdot_size, extra_offset, extra_size;
1454 :
1455 0 : ret = ext4_get_inode_loc(inode, &iloc);
1456 0 : if (ret)
1457 : return ret;
1458 :
1459 0 : down_read(&EXT4_I(inode)->xattr_sem);
1460 0 : if (!ext4_has_inline_data(inode)) {
1461 0 : up_read(&EXT4_I(inode)->xattr_sem);
1462 0 : *has_inline_data = 0;
1463 0 : goto out;
1464 : }
1465 :
1466 0 : inline_size = ext4_get_inline_size(inode);
1467 0 : dir_buf = kmalloc(inline_size, GFP_NOFS);
1468 0 : if (!dir_buf) {
1469 0 : ret = -ENOMEM;
1470 0 : up_read(&EXT4_I(inode)->xattr_sem);
1471 0 : goto out;
1472 : }
1473 :
1474 0 : ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1475 0 : up_read(&EXT4_I(inode)->xattr_sem);
1476 0 : if (ret < 0)
1477 0 : goto out;
1478 :
1479 0 : ret = 0;
1480 0 : sb = inode->i_sb;
1481 0 : parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1482 0 : offset = ctx->pos;
1483 :
1484 : /*
1485 : * dotdot_offset and dotdot_size is the real offset and
1486 : * size for ".." and "." if the dir is block based while
1487 : * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1488 : * So we will use extra_offset and extra_size to indicate them
1489 : * during the inline dir iteration.
1490 : */
1491 0 : dotdot_offset = EXT4_DIR_REC_LEN(1);
1492 0 : dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1493 0 : extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1494 0 : extra_size = extra_offset + inline_size;
1495 :
1496 : /*
1497 : * If the version has changed since the last call to
1498 : * readdir(2), then we might be pointing to an invalid
1499 : * dirent right now. Scan from the start of the inline
1500 : * dir to make sure.
1501 : */
1502 0 : if (!inode_eq_iversion(inode, file->f_version)) {
1503 0 : for (i = 0; i < extra_size && i < offset;) {
1504 : /*
1505 : * "." is with offset 0 and
1506 : * ".." is dotdot_offset.
1507 : */
1508 0 : if (!i) {
1509 0 : i = dotdot_offset;
1510 0 : continue;
1511 0 : } else if (i == dotdot_offset) {
1512 0 : i = dotdot_size;
1513 0 : continue;
1514 : }
1515 : /* for other entry, the real offset in
1516 : * the buf has to be tuned accordingly.
1517 : */
1518 0 : de = (struct ext4_dir_entry_2 *)
1519 0 : (dir_buf + i - extra_offset);
1520 : /* It's too expensive to do a full
1521 : * dirent test each time round this
1522 : * loop, but we do have to test at
1523 : * least that it is non-zero. A
1524 : * failure will be detected in the
1525 : * dirent test below. */
1526 0 : if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1527 : < EXT4_DIR_REC_LEN(1))
1528 : break;
1529 0 : i += ext4_rec_len_from_disk(de->rec_len,
1530 : extra_size);
1531 : }
1532 0 : offset = i;
1533 0 : ctx->pos = offset;
1534 0 : file->f_version = inode_query_iversion(inode);
1535 : }
1536 :
1537 0 : while (ctx->pos < extra_size) {
1538 0 : if (ctx->pos == 0) {
1539 0 : if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1540 0 : goto out;
1541 0 : ctx->pos = dotdot_offset;
1542 0 : continue;
1543 : }
1544 :
1545 0 : if (ctx->pos == dotdot_offset) {
1546 0 : if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1547 0 : goto out;
1548 0 : ctx->pos = dotdot_size;
1549 0 : continue;
1550 : }
1551 :
1552 0 : de = (struct ext4_dir_entry_2 *)
1553 0 : (dir_buf + ctx->pos - extra_offset);
1554 0 : if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1555 : extra_size, ctx->pos))
1556 0 : goto out;
1557 0 : if (le32_to_cpu(de->inode)) {
1558 0 : if (!dir_emit(ctx, de->name, de->name_len,
1559 : le32_to_cpu(de->inode),
1560 0 : get_dtype(sb, de->file_type)))
1561 0 : goto out;
1562 : }
1563 0 : ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1564 : }
1565 0 : out:
1566 0 : kfree(dir_buf);
1567 0 : brelse(iloc.bh);
1568 : return ret;
1569 : }
1570 :
1571 0 : struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1572 : struct ext4_dir_entry_2 **parent_de,
1573 : int *retval)
1574 : {
1575 0 : struct ext4_iloc iloc;
1576 :
1577 0 : *retval = ext4_get_inode_loc(inode, &iloc);
1578 0 : if (*retval)
1579 : return NULL;
1580 :
1581 0 : *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1582 :
1583 0 : return iloc.bh;
1584 : }
1585 :
1586 : /*
1587 : * Try to create the inline data for the new dir.
1588 : * If it succeeds, return 0, otherwise return the error.
1589 : * In case of ENOSPC, the caller should create the normal disk layout dir.
1590 : */
1591 0 : int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1592 : struct inode *inode)
1593 : {
1594 0 : int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1595 0 : struct ext4_iloc iloc;
1596 0 : struct ext4_dir_entry_2 *de;
1597 :
1598 0 : ret = ext4_get_inode_loc(inode, &iloc);
1599 0 : if (ret)
1600 : return ret;
1601 :
1602 0 : ret = ext4_prepare_inline_data(handle, inode, inline_size);
1603 0 : if (ret)
1604 0 : goto out;
1605 :
1606 : /*
1607 : * For inline dir, we only save the inode information for the ".."
1608 : * and create a fake dentry to cover the left space.
1609 : */
1610 0 : de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1611 0 : de->inode = cpu_to_le32(parent->i_ino);
1612 0 : de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1613 0 : de->inode = 0;
1614 0 : de->rec_len = ext4_rec_len_to_disk(
1615 : inline_size - EXT4_INLINE_DOTDOT_SIZE,
1616 : inline_size);
1617 0 : set_nlink(inode, 2);
1618 0 : inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1619 0 : out:
1620 0 : brelse(iloc.bh);
1621 : return ret;
1622 : }
1623 :
1624 0 : struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1625 : struct ext4_filename *fname,
1626 : struct ext4_dir_entry_2 **res_dir,
1627 : int *has_inline_data)
1628 : {
1629 0 : int ret;
1630 0 : struct ext4_iloc iloc;
1631 0 : void *inline_start;
1632 0 : int inline_size;
1633 :
1634 0 : if (ext4_get_inode_loc(dir, &iloc))
1635 : return NULL;
1636 :
1637 0 : down_read(&EXT4_I(dir)->xattr_sem);
1638 0 : if (!ext4_has_inline_data(dir)) {
1639 0 : *has_inline_data = 0;
1640 0 : goto out;
1641 : }
1642 :
1643 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1644 : EXT4_INLINE_DOTDOT_SIZE;
1645 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1646 0 : ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1647 : dir, fname, 0, res_dir);
1648 0 : if (ret == 1)
1649 0 : goto out_find;
1650 0 : if (ret < 0)
1651 0 : goto out;
1652 :
1653 0 : if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1654 0 : goto out;
1655 :
1656 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1657 0 : inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1658 :
1659 0 : ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1660 : dir, fname, 0, res_dir);
1661 0 : if (ret == 1)
1662 0 : goto out_find;
1663 :
1664 0 : out:
1665 0 : brelse(iloc.bh);
1666 0 : iloc.bh = NULL;
1667 0 : out_find:
1668 0 : up_read(&EXT4_I(dir)->xattr_sem);
1669 0 : return iloc.bh;
1670 : }
1671 :
1672 0 : int ext4_delete_inline_entry(handle_t *handle,
1673 : struct inode *dir,
1674 : struct ext4_dir_entry_2 *de_del,
1675 : struct buffer_head *bh,
1676 : int *has_inline_data)
1677 : {
1678 0 : int err, inline_size, no_expand;
1679 0 : struct ext4_iloc iloc;
1680 0 : void *inline_start;
1681 :
1682 0 : err = ext4_get_inode_loc(dir, &iloc);
1683 0 : if (err)
1684 : return err;
1685 :
1686 0 : ext4_write_lock_xattr(dir, &no_expand);
1687 0 : if (!ext4_has_inline_data(dir)) {
1688 0 : *has_inline_data = 0;
1689 0 : goto out;
1690 : }
1691 :
1692 0 : if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1693 : EXT4_MIN_INLINE_DATA_SIZE) {
1694 0 : inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1695 : EXT4_INLINE_DOTDOT_SIZE;
1696 0 : inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1697 : EXT4_INLINE_DOTDOT_SIZE;
1698 : } else {
1699 0 : inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1700 0 : inline_size = ext4_get_inline_size(dir) -
1701 : EXT4_MIN_INLINE_DATA_SIZE;
1702 : }
1703 :
1704 0 : BUFFER_TRACE(bh, "get_write_access");
1705 0 : err = ext4_journal_get_write_access(handle, bh);
1706 0 : if (err)
1707 0 : goto out;
1708 :
1709 0 : err = ext4_generic_delete_entry(dir, de_del, bh,
1710 : inline_start, inline_size, 0);
1711 0 : if (err)
1712 0 : goto out;
1713 :
1714 0 : ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1715 0 : out:
1716 0 : ext4_write_unlock_xattr(dir, &no_expand);
1717 0 : if (likely(err == 0))
1718 0 : err = ext4_mark_inode_dirty(handle, dir);
1719 0 : brelse(iloc.bh);
1720 0 : if (err != -ENOENT)
1721 0 : ext4_std_error(dir->i_sb, err);
1722 : return err;
1723 : }
1724 :
1725 : /*
1726 : * Get the inline dentry at offset.
1727 : */
1728 : static inline struct ext4_dir_entry_2 *
1729 0 : ext4_get_inline_entry(struct inode *inode,
1730 : struct ext4_iloc *iloc,
1731 : unsigned int offset,
1732 : void **inline_start,
1733 : int *inline_size)
1734 : {
1735 0 : void *inline_pos;
1736 :
1737 0 : BUG_ON(offset > ext4_get_inline_size(inode));
1738 :
1739 0 : if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1740 0 : inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1741 0 : *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1742 : } else {
1743 0 : inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1744 0 : offset -= EXT4_MIN_INLINE_DATA_SIZE;
1745 0 : *inline_size = ext4_get_inline_size(inode) -
1746 : EXT4_MIN_INLINE_DATA_SIZE;
1747 : }
1748 :
1749 0 : if (inline_start)
1750 0 : *inline_start = inline_pos;
1751 0 : return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1752 : }
1753 :
1754 0 : bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1755 : {
1756 0 : int err, inline_size;
1757 0 : struct ext4_iloc iloc;
1758 0 : size_t inline_len;
1759 0 : void *inline_pos;
1760 0 : unsigned int offset;
1761 0 : struct ext4_dir_entry_2 *de;
1762 0 : bool ret = true;
1763 :
1764 0 : err = ext4_get_inode_loc(dir, &iloc);
1765 0 : if (err) {
1766 0 : EXT4_ERROR_INODE_ERR(dir, -err,
1767 : "error %d getting inode %lu block",
1768 : err, dir->i_ino);
1769 0 : return true;
1770 : }
1771 :
1772 0 : down_read(&EXT4_I(dir)->xattr_sem);
1773 0 : if (!ext4_has_inline_data(dir)) {
1774 0 : *has_inline_data = 0;
1775 0 : goto out;
1776 : }
1777 :
1778 0 : de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1779 0 : if (!le32_to_cpu(de->inode)) {
1780 0 : ext4_warning(dir->i_sb,
1781 : "bad inline directory (dir #%lu) - no `..'",
1782 : dir->i_ino);
1783 0 : ret = true;
1784 0 : goto out;
1785 : }
1786 :
1787 0 : inline_len = ext4_get_inline_size(dir);
1788 0 : offset = EXT4_INLINE_DOTDOT_SIZE;
1789 0 : while (offset < inline_len) {
1790 0 : de = ext4_get_inline_entry(dir, &iloc, offset,
1791 : &inline_pos, &inline_size);
1792 0 : if (ext4_check_dir_entry(dir, NULL, de,
1793 : iloc.bh, inline_pos,
1794 : inline_size, offset)) {
1795 0 : ext4_warning(dir->i_sb,
1796 : "bad inline directory (dir #%lu) - "
1797 : "inode %u, rec_len %u, name_len %d"
1798 : "inline size %d",
1799 : dir->i_ino, le32_to_cpu(de->inode),
1800 : le16_to_cpu(de->rec_len), de->name_len,
1801 : inline_size);
1802 0 : ret = true;
1803 0 : goto out;
1804 : }
1805 0 : if (le32_to_cpu(de->inode)) {
1806 0 : ret = false;
1807 0 : goto out;
1808 : }
1809 0 : offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1810 : }
1811 :
1812 0 : out:
1813 0 : up_read(&EXT4_I(dir)->xattr_sem);
1814 0 : brelse(iloc.bh);
1815 : return ret;
1816 : }
1817 :
1818 0 : int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1819 : {
1820 0 : int ret, no_expand;
1821 :
1822 0 : ext4_write_lock_xattr(inode, &no_expand);
1823 0 : ret = ext4_destroy_inline_data_nolock(handle, inode);
1824 0 : ext4_write_unlock_xattr(inode, &no_expand);
1825 :
1826 0 : return ret;
1827 : }
1828 :
1829 0 : int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1830 : {
1831 0 : __u64 addr;
1832 0 : int error = -EAGAIN;
1833 0 : struct ext4_iloc iloc;
1834 :
1835 0 : down_read(&EXT4_I(inode)->xattr_sem);
1836 0 : if (!ext4_has_inline_data(inode))
1837 0 : goto out;
1838 :
1839 0 : error = ext4_get_inode_loc(inode, &iloc);
1840 0 : if (error)
1841 0 : goto out;
1842 :
1843 0 : addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1844 0 : addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1845 0 : addr += offsetof(struct ext4_inode, i_block);
1846 :
1847 0 : brelse(iloc.bh);
1848 :
1849 0 : iomap->addr = addr;
1850 0 : iomap->offset = 0;
1851 0 : iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1852 : i_size_read(inode));
1853 0 : iomap->type = IOMAP_INLINE;
1854 0 : iomap->flags = 0;
1855 :
1856 0 : out:
1857 0 : up_read(&EXT4_I(inode)->xattr_sem);
1858 0 : return error;
1859 : }
1860 :
1861 0 : int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1862 : {
1863 0 : handle_t *handle;
1864 0 : int inline_size, value_len, needed_blocks, no_expand, err = 0;
1865 0 : size_t i_size;
1866 0 : void *value = NULL;
1867 0 : struct ext4_xattr_ibody_find is = {
1868 : .s = { .not_found = -ENODATA, },
1869 : };
1870 0 : struct ext4_xattr_info i = {
1871 : .name_index = EXT4_XATTR_INDEX_SYSTEM,
1872 : .name = EXT4_XATTR_SYSTEM_DATA,
1873 : };
1874 :
1875 :
1876 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
1877 0 : handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1878 0 : if (IS_ERR(handle))
1879 0 : return PTR_ERR(handle);
1880 :
1881 0 : ext4_write_lock_xattr(inode, &no_expand);
1882 0 : if (!ext4_has_inline_data(inode)) {
1883 0 : ext4_write_unlock_xattr(inode, &no_expand);
1884 0 : *has_inline = 0;
1885 0 : ext4_journal_stop(handle);
1886 0 : return 0;
1887 : }
1888 :
1889 0 : if ((err = ext4_orphan_add(handle, inode)) != 0)
1890 0 : goto out;
1891 :
1892 0 : if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1893 0 : goto out;
1894 :
1895 0 : down_write(&EXT4_I(inode)->i_data_sem);
1896 0 : i_size = inode->i_size;
1897 0 : inline_size = ext4_get_inline_size(inode);
1898 0 : EXT4_I(inode)->i_disksize = i_size;
1899 :
1900 0 : if (i_size < inline_size) {
1901 : /* Clear the content in the xattr space. */
1902 0 : if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1903 0 : if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1904 0 : goto out_error;
1905 :
1906 0 : BUG_ON(is.s.not_found);
1907 :
1908 0 : value_len = le32_to_cpu(is.s.here->e_value_size);
1909 0 : value = kmalloc(value_len, GFP_NOFS);
1910 0 : if (!value) {
1911 0 : err = -ENOMEM;
1912 0 : goto out_error;
1913 : }
1914 :
1915 0 : err = ext4_xattr_ibody_get(inode, i.name_index,
1916 : i.name, value, value_len);
1917 0 : if (err <= 0)
1918 0 : goto out_error;
1919 :
1920 0 : i.value = value;
1921 0 : i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1922 0 : i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1923 0 : err = ext4_xattr_ibody_inline_set(handle, inode,
1924 : &i, &is);
1925 0 : if (err)
1926 0 : goto out_error;
1927 : }
1928 :
1929 : /* Clear the content within i_blocks. */
1930 0 : if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1931 0 : void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1932 0 : memset(p + i_size, 0,
1933 : EXT4_MIN_INLINE_DATA_SIZE - i_size);
1934 : }
1935 :
1936 0 : EXT4_I(inode)->i_inline_size = i_size <
1937 : EXT4_MIN_INLINE_DATA_SIZE ?
1938 0 : EXT4_MIN_INLINE_DATA_SIZE : i_size;
1939 : }
1940 :
1941 0 : out_error:
1942 0 : up_write(&EXT4_I(inode)->i_data_sem);
1943 0 : out:
1944 0 : brelse(is.iloc.bh);
1945 0 : ext4_write_unlock_xattr(inode, &no_expand);
1946 0 : kfree(value);
1947 0 : if (inode->i_nlink)
1948 0 : ext4_orphan_del(handle, inode);
1949 :
1950 0 : if (err == 0) {
1951 0 : inode->i_mtime = inode->i_ctime = current_time(inode);
1952 0 : err = ext4_mark_inode_dirty(handle, inode);
1953 0 : if (IS_SYNC(inode))
1954 0 : ext4_handle_sync(handle);
1955 : }
1956 0 : ext4_journal_stop(handle);
1957 0 : return err;
1958 : }
1959 :
1960 304 : int ext4_convert_inline_data(struct inode *inode)
1961 : {
1962 304 : int error, needed_blocks, no_expand;
1963 304 : handle_t *handle;
1964 304 : struct ext4_iloc iloc;
1965 :
1966 304 : if (!ext4_has_inline_data(inode)) {
1967 304 : ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1968 304 : return 0;
1969 : }
1970 :
1971 0 : needed_blocks = ext4_writepage_trans_blocks(inode);
1972 :
1973 0 : iloc.bh = NULL;
1974 0 : error = ext4_get_inode_loc(inode, &iloc);
1975 0 : if (error)
1976 : return error;
1977 :
1978 0 : handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1979 0 : if (IS_ERR(handle)) {
1980 0 : error = PTR_ERR(handle);
1981 0 : goto out_free;
1982 : }
1983 :
1984 0 : ext4_write_lock_xattr(inode, &no_expand);
1985 0 : if (ext4_has_inline_data(inode))
1986 0 : error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1987 0 : ext4_write_unlock_xattr(inode, &no_expand);
1988 0 : ext4_journal_stop(handle);
1989 0 : out_free:
1990 0 : brelse(iloc.bh);
1991 : return error;
1992 : }
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