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 | if (EXT4_I(inode)->i_inline_off) |
26 | return EXT4_I(inode)->i_inline_size; |
27 | |
28 | return 0; |
29 | } |
30 | |
31 | static int get_max_inline_xattr_value_size(struct inode *inode, |
32 | struct ext4_iloc *iloc) |
33 | { |
34 | struct ext4_xattr_ibody_header *; |
35 | struct ext4_xattr_entry *entry; |
36 | struct ext4_inode *raw_inode; |
37 | void *end; |
38 | int free, min_offs; |
39 | |
40 | if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) |
41 | return 0; |
42 | |
43 | min_offs = EXT4_SB(sb: inode->i_sb)->s_inode_size - |
44 | EXT4_GOOD_OLD_INODE_SIZE - |
45 | EXT4_I(inode)->i_extra_isize - |
46 | sizeof(struct ext4_xattr_ibody_header); |
47 | |
48 | /* |
49 | * We need to subtract another sizeof(__u32) since an in-inode xattr |
50 | * needs an empty 4 bytes to indicate the gap between the xattr entry |
51 | * and the name/value pair. |
52 | */ |
53 | if (!ext4_test_inode_state(inode, bit: EXT4_STATE_XATTR)) |
54 | return EXT4_XATTR_SIZE(min_offs - |
55 | EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - |
56 | EXT4_XATTR_ROUND - sizeof(__u32)); |
57 | |
58 | raw_inode = ext4_raw_inode(iloc); |
59 | header = IHDR(inode, raw_inode); |
60 | entry = IFIRST(header); |
61 | end = (void *)raw_inode + EXT4_SB(sb: inode->i_sb)->s_inode_size; |
62 | |
63 | /* Compute min_offs. */ |
64 | while (!IS_LAST_ENTRY(entry)) { |
65 | void *next = EXT4_XATTR_NEXT(entry); |
66 | |
67 | if (next >= end) { |
68 | EXT4_ERROR_INODE(inode, |
69 | "corrupt xattr in inline inode" ); |
70 | return 0; |
71 | } |
72 | if (!entry->e_value_inum && entry->e_value_size) { |
73 | size_t offs = le16_to_cpu(entry->e_value_offs); |
74 | if (offs < min_offs) |
75 | min_offs = offs; |
76 | } |
77 | entry = next; |
78 | } |
79 | free = min_offs - |
80 | ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); |
81 | |
82 | if (EXT4_I(inode)->i_inline_off) { |
83 | entry = (struct ext4_xattr_entry *) |
84 | ((void *)raw_inode + EXT4_I(inode)->i_inline_off); |
85 | |
86 | free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); |
87 | goto out; |
88 | } |
89 | |
90 | free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); |
91 | |
92 | if (free > EXT4_XATTR_ROUND) |
93 | free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); |
94 | else |
95 | free = 0; |
96 | |
97 | out: |
98 | return free; |
99 | } |
100 | |
101 | /* |
102 | * Get the maximum size we now can store in an inode. |
103 | * If we can't find the space for a xattr entry, don't use the space |
104 | * of the extents since we have no space to indicate the inline data. |
105 | */ |
106 | int ext4_get_max_inline_size(struct inode *inode) |
107 | { |
108 | int error, max_inline_size; |
109 | struct ext4_iloc iloc; |
110 | |
111 | if (EXT4_I(inode)->i_extra_isize == 0) |
112 | return 0; |
113 | |
114 | error = ext4_get_inode_loc(inode, &iloc); |
115 | if (error) { |
116 | ext4_error_inode_err(inode, __func__, __LINE__, 0, -error, |
117 | "can't get inode location %lu" , |
118 | inode->i_ino); |
119 | return 0; |
120 | } |
121 | |
122 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
123 | max_inline_size = get_max_inline_xattr_value_size(inode, iloc: &iloc); |
124 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
125 | |
126 | brelse(bh: iloc.bh); |
127 | |
128 | if (!max_inline_size) |
129 | return 0; |
130 | |
131 | return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; |
132 | } |
133 | |
134 | /* |
135 | * this function does not take xattr_sem, which is OK because it is |
136 | * currently only used in a code path coming form ext4_iget, before |
137 | * the new inode has been unlocked |
138 | */ |
139 | int ext4_find_inline_data_nolock(struct inode *inode) |
140 | { |
141 | struct ext4_xattr_ibody_find is = { |
142 | .s = { .not_found = -ENODATA, }, |
143 | }; |
144 | struct ext4_xattr_info i = { |
145 | .name_index = EXT4_XATTR_INDEX_SYSTEM, |
146 | .name = EXT4_XATTR_SYSTEM_DATA, |
147 | }; |
148 | int error; |
149 | |
150 | if (EXT4_I(inode)->i_extra_isize == 0) |
151 | return 0; |
152 | |
153 | error = ext4_get_inode_loc(inode, &is.iloc); |
154 | if (error) |
155 | return error; |
156 | |
157 | error = ext4_xattr_ibody_find(inode, i: &i, is: &is); |
158 | if (error) |
159 | goto out; |
160 | |
161 | if (!is.s.not_found) { |
162 | if (is.s.here->e_value_inum) { |
163 | EXT4_ERROR_INODE(inode, "inline data xattr refers " |
164 | "to an external xattr inode" ); |
165 | error = -EFSCORRUPTED; |
166 | goto out; |
167 | } |
168 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
169 | (void *)ext4_raw_inode(iloc: &is.iloc)); |
170 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
171 | le32_to_cpu(is.s.here->e_value_size); |
172 | } |
173 | out: |
174 | brelse(bh: is.iloc.bh); |
175 | return error; |
176 | } |
177 | |
178 | static int ext4_read_inline_data(struct inode *inode, void *buffer, |
179 | unsigned int len, |
180 | struct ext4_iloc *iloc) |
181 | { |
182 | struct ext4_xattr_entry *entry; |
183 | struct ext4_xattr_ibody_header *; |
184 | int cp_len = 0; |
185 | struct ext4_inode *raw_inode; |
186 | |
187 | if (!len) |
188 | return 0; |
189 | |
190 | BUG_ON(len > EXT4_I(inode)->i_inline_size); |
191 | |
192 | cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE); |
193 | |
194 | raw_inode = ext4_raw_inode(iloc); |
195 | memcpy(buffer, (void *)(raw_inode->i_block), cp_len); |
196 | |
197 | len -= cp_len; |
198 | buffer += cp_len; |
199 | |
200 | if (!len) |
201 | goto out; |
202 | |
203 | header = IHDR(inode, raw_inode); |
204 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
205 | EXT4_I(inode)->i_inline_off); |
206 | len = min_t(unsigned int, len, |
207 | (unsigned int)le32_to_cpu(entry->e_value_size)); |
208 | |
209 | memcpy(buffer, |
210 | (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); |
211 | cp_len += len; |
212 | |
213 | out: |
214 | return cp_len; |
215 | } |
216 | |
217 | /* |
218 | * write the buffer to the inline inode. |
219 | * If 'create' is set, we don't need to do the extra copy in the xattr |
220 | * value since it is already handled by ext4_xattr_ibody_set. |
221 | * That saves us one memcpy. |
222 | */ |
223 | static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, |
224 | void *buffer, loff_t pos, unsigned int len) |
225 | { |
226 | struct ext4_xattr_entry *entry; |
227 | struct ext4_xattr_ibody_header *; |
228 | struct ext4_inode *raw_inode; |
229 | int cp_len = 0; |
230 | |
231 | if (unlikely(ext4_forced_shutdown(inode->i_sb))) |
232 | return; |
233 | |
234 | BUG_ON(!EXT4_I(inode)->i_inline_off); |
235 | BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); |
236 | |
237 | raw_inode = ext4_raw_inode(iloc); |
238 | buffer += pos; |
239 | |
240 | if (pos < EXT4_MIN_INLINE_DATA_SIZE) { |
241 | cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? |
242 | EXT4_MIN_INLINE_DATA_SIZE - pos : len; |
243 | memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); |
244 | |
245 | len -= cp_len; |
246 | buffer += cp_len; |
247 | pos += cp_len; |
248 | } |
249 | |
250 | if (!len) |
251 | return; |
252 | |
253 | pos -= EXT4_MIN_INLINE_DATA_SIZE; |
254 | header = IHDR(inode, raw_inode); |
255 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
256 | EXT4_I(inode)->i_inline_off); |
257 | |
258 | memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, |
259 | buffer, len); |
260 | } |
261 | |
262 | static int ext4_create_inline_data(handle_t *handle, |
263 | struct inode *inode, unsigned len) |
264 | { |
265 | int error; |
266 | void *value = NULL; |
267 | struct ext4_xattr_ibody_find is = { |
268 | .s = { .not_found = -ENODATA, }, |
269 | }; |
270 | struct ext4_xattr_info i = { |
271 | .name_index = EXT4_XATTR_INDEX_SYSTEM, |
272 | .name = EXT4_XATTR_SYSTEM_DATA, |
273 | }; |
274 | |
275 | error = ext4_get_inode_loc(inode, &is.iloc); |
276 | if (error) |
277 | return error; |
278 | |
279 | BUFFER_TRACE(is.iloc.bh, "get_write_access" ); |
280 | error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh, |
281 | EXT4_JTR_NONE); |
282 | if (error) |
283 | goto out; |
284 | |
285 | if (len > EXT4_MIN_INLINE_DATA_SIZE) { |
286 | value = EXT4_ZERO_XATTR_VALUE; |
287 | len -= EXT4_MIN_INLINE_DATA_SIZE; |
288 | } else { |
289 | value = "" ; |
290 | len = 0; |
291 | } |
292 | |
293 | /* Insert the xttr entry. */ |
294 | i.value = value; |
295 | i.value_len = len; |
296 | |
297 | error = ext4_xattr_ibody_find(inode, i: &i, is: &is); |
298 | if (error) |
299 | goto out; |
300 | |
301 | BUG_ON(!is.s.not_found); |
302 | |
303 | error = ext4_xattr_ibody_set(handle, inode, i: &i, is: &is); |
304 | if (error) { |
305 | if (error == -ENOSPC) |
306 | ext4_clear_inode_state(inode, |
307 | bit: EXT4_STATE_MAY_INLINE_DATA); |
308 | goto out; |
309 | } |
310 | |
311 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
312 | 0, EXT4_MIN_INLINE_DATA_SIZE); |
313 | |
314 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
315 | (void *)ext4_raw_inode(iloc: &is.iloc)); |
316 | EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; |
317 | ext4_clear_inode_flag(inode, bit: EXT4_INODE_EXTENTS); |
318 | ext4_set_inode_flag(inode, bit: EXT4_INODE_INLINE_DATA); |
319 | get_bh(bh: is.iloc.bh); |
320 | error = ext4_mark_iloc_dirty(handle, inode, iloc: &is.iloc); |
321 | |
322 | out: |
323 | brelse(bh: is.iloc.bh); |
324 | return error; |
325 | } |
326 | |
327 | static int ext4_update_inline_data(handle_t *handle, struct inode *inode, |
328 | unsigned int len) |
329 | { |
330 | int error; |
331 | void *value = NULL; |
332 | struct ext4_xattr_ibody_find is = { |
333 | .s = { .not_found = -ENODATA, }, |
334 | }; |
335 | 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 | if (len <= EXT4_I(inode)->i_inline_size) |
342 | return 0; |
343 | |
344 | error = ext4_get_inode_loc(inode, &is.iloc); |
345 | if (error) |
346 | return error; |
347 | |
348 | error = ext4_xattr_ibody_find(inode, i: &i, is: &is); |
349 | if (error) |
350 | goto out; |
351 | |
352 | BUG_ON(is.s.not_found); |
353 | |
354 | len -= EXT4_MIN_INLINE_DATA_SIZE; |
355 | value = kzalloc(size: len, GFP_NOFS); |
356 | if (!value) { |
357 | error = -ENOMEM; |
358 | goto out; |
359 | } |
360 | |
361 | error = ext4_xattr_ibody_get(inode, name_index: i.name_index, name: i.name, |
362 | buffer: value, buffer_size: len); |
363 | if (error < 0) |
364 | goto out; |
365 | |
366 | BUFFER_TRACE(is.iloc.bh, "get_write_access" ); |
367 | error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh, |
368 | EXT4_JTR_NONE); |
369 | if (error) |
370 | goto out; |
371 | |
372 | /* Update the xattr entry. */ |
373 | i.value = value; |
374 | i.value_len = len; |
375 | |
376 | error = ext4_xattr_ibody_set(handle, inode, i: &i, is: &is); |
377 | if (error) |
378 | goto out; |
379 | |
380 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
381 | (void *)ext4_raw_inode(iloc: &is.iloc)); |
382 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
383 | le32_to_cpu(is.s.here->e_value_size); |
384 | ext4_set_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
385 | get_bh(bh: is.iloc.bh); |
386 | error = ext4_mark_iloc_dirty(handle, inode, iloc: &is.iloc); |
387 | |
388 | out: |
389 | kfree(objp: value); |
390 | brelse(bh: is.iloc.bh); |
391 | return error; |
392 | } |
393 | |
394 | static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
395 | unsigned int len) |
396 | { |
397 | int ret, size, no_expand; |
398 | struct ext4_inode_info *ei = EXT4_I(inode); |
399 | |
400 | if (!ext4_test_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA)) |
401 | return -ENOSPC; |
402 | |
403 | size = ext4_get_max_inline_size(inode); |
404 | if (size < len) |
405 | return -ENOSPC; |
406 | |
407 | ext4_write_lock_xattr(inode, save: &no_expand); |
408 | |
409 | if (ei->i_inline_off) |
410 | ret = ext4_update_inline_data(handle, inode, len); |
411 | else |
412 | ret = ext4_create_inline_data(handle, inode, len); |
413 | |
414 | ext4_write_unlock_xattr(inode, save: &no_expand); |
415 | return ret; |
416 | } |
417 | |
418 | static int ext4_destroy_inline_data_nolock(handle_t *handle, |
419 | struct inode *inode) |
420 | { |
421 | struct ext4_inode_info *ei = EXT4_I(inode); |
422 | struct ext4_xattr_ibody_find is = { |
423 | .s = { .not_found = 0, }, |
424 | }; |
425 | 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 | int error; |
432 | |
433 | if (!ei->i_inline_off) |
434 | return 0; |
435 | |
436 | error = ext4_get_inode_loc(inode, &is.iloc); |
437 | if (error) |
438 | return error; |
439 | |
440 | error = ext4_xattr_ibody_find(inode, i: &i, is: &is); |
441 | if (error) |
442 | goto out; |
443 | |
444 | BUFFER_TRACE(is.iloc.bh, "get_write_access" ); |
445 | error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh, |
446 | EXT4_JTR_NONE); |
447 | if (error) |
448 | goto out; |
449 | |
450 | error = ext4_xattr_ibody_set(handle, inode, i: &i, is: &is); |
451 | if (error) |
452 | goto out; |
453 | |
454 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
455 | 0, EXT4_MIN_INLINE_DATA_SIZE); |
456 | memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE); |
457 | |
458 | if (ext4_has_feature_extents(sb: inode->i_sb)) { |
459 | if (S_ISDIR(inode->i_mode) || |
460 | S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { |
461 | ext4_set_inode_flag(inode, bit: EXT4_INODE_EXTENTS); |
462 | ext4_ext_tree_init(handle, inode); |
463 | } |
464 | } |
465 | ext4_clear_inode_flag(inode, bit: EXT4_INODE_INLINE_DATA); |
466 | |
467 | get_bh(bh: is.iloc.bh); |
468 | error = ext4_mark_iloc_dirty(handle, inode, iloc: &is.iloc); |
469 | |
470 | EXT4_I(inode)->i_inline_off = 0; |
471 | EXT4_I(inode)->i_inline_size = 0; |
472 | ext4_clear_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
473 | out: |
474 | brelse(bh: is.iloc.bh); |
475 | if (error == -ENODATA) |
476 | error = 0; |
477 | return error; |
478 | } |
479 | |
480 | static int ext4_read_inline_folio(struct inode *inode, struct folio *folio) |
481 | { |
482 | void *kaddr; |
483 | int ret = 0; |
484 | size_t len; |
485 | struct ext4_iloc iloc; |
486 | |
487 | BUG_ON(!folio_test_locked(folio)); |
488 | BUG_ON(!ext4_has_inline_data(inode)); |
489 | BUG_ON(folio->index); |
490 | |
491 | if (!EXT4_I(inode)->i_inline_off) { |
492 | ext4_warning(inode->i_sb, "inode %lu doesn't have inline data." , |
493 | inode->i_ino); |
494 | goto out; |
495 | } |
496 | |
497 | ret = ext4_get_inode_loc(inode, &iloc); |
498 | if (ret) |
499 | goto out; |
500 | |
501 | len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); |
502 | BUG_ON(len > PAGE_SIZE); |
503 | kaddr = kmap_local_folio(folio, offset: 0); |
504 | ret = ext4_read_inline_data(inode, buffer: kaddr, len, iloc: &iloc); |
505 | flush_dcache_folio(folio); |
506 | kunmap_local(kaddr); |
507 | folio_zero_segment(folio, start: len, xend: folio_size(folio)); |
508 | folio_mark_uptodate(folio); |
509 | brelse(bh: iloc.bh); |
510 | |
511 | out: |
512 | return ret; |
513 | } |
514 | |
515 | int ext4_readpage_inline(struct inode *inode, struct folio *folio) |
516 | { |
517 | int ret = 0; |
518 | |
519 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
520 | if (!ext4_has_inline_data(inode)) { |
521 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
522 | return -EAGAIN; |
523 | } |
524 | |
525 | /* |
526 | * Current inline data can only exist in the 1st page, |
527 | * So for all the other pages, just set them uptodate. |
528 | */ |
529 | if (!folio->index) |
530 | ret = ext4_read_inline_folio(inode, folio); |
531 | else if (!folio_test_uptodate(folio)) { |
532 | folio_zero_segment(folio, start: 0, xend: folio_size(folio)); |
533 | folio_mark_uptodate(folio); |
534 | } |
535 | |
536 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
537 | |
538 | folio_unlock(folio); |
539 | return ret >= 0 ? 0 : ret; |
540 | } |
541 | |
542 | static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
543 | struct inode *inode) |
544 | { |
545 | int ret, needed_blocks, no_expand; |
546 | handle_t *handle = NULL; |
547 | int retries = 0, sem_held = 0; |
548 | struct folio *folio = NULL; |
549 | unsigned from, to; |
550 | struct ext4_iloc iloc; |
551 | |
552 | if (!ext4_has_inline_data(inode)) { |
553 | /* |
554 | * clear the flag so that no new write |
555 | * will trap here again. |
556 | */ |
557 | ext4_clear_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
558 | return 0; |
559 | } |
560 | |
561 | needed_blocks = ext4_writepage_trans_blocks(inode); |
562 | |
563 | ret = ext4_get_inode_loc(inode, &iloc); |
564 | if (ret) |
565 | return ret; |
566 | |
567 | retry: |
568 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
569 | if (IS_ERR(ptr: handle)) { |
570 | ret = PTR_ERR(ptr: handle); |
571 | handle = NULL; |
572 | goto out; |
573 | } |
574 | |
575 | /* We cannot recurse into the filesystem as the transaction is already |
576 | * started */ |
577 | folio = __filemap_get_folio(mapping, index: 0, FGP_WRITEBEGIN | FGP_NOFS, |
578 | gfp: mapping_gfp_mask(mapping)); |
579 | if (IS_ERR(ptr: folio)) { |
580 | ret = PTR_ERR(ptr: folio); |
581 | goto out_nofolio; |
582 | } |
583 | |
584 | ext4_write_lock_xattr(inode, save: &no_expand); |
585 | sem_held = 1; |
586 | /* If some one has already done this for us, just exit. */ |
587 | if (!ext4_has_inline_data(inode)) { |
588 | ret = 0; |
589 | goto out; |
590 | } |
591 | |
592 | from = 0; |
593 | to = ext4_get_inline_size(inode); |
594 | if (!folio_test_uptodate(folio)) { |
595 | ret = ext4_read_inline_folio(inode, folio); |
596 | if (ret < 0) |
597 | goto out; |
598 | } |
599 | |
600 | ret = ext4_destroy_inline_data_nolock(handle, inode); |
601 | if (ret) |
602 | goto out; |
603 | |
604 | if (ext4_should_dioread_nolock(inode)) { |
605 | ret = __block_write_begin(page: &folio->page, pos: from, len: to, |
606 | get_block: ext4_get_block_unwritten); |
607 | } else |
608 | ret = __block_write_begin(page: &folio->page, pos: from, len: to, get_block: ext4_get_block); |
609 | |
610 | if (!ret && ext4_should_journal_data(inode)) { |
611 | ret = ext4_walk_page_buffers(handle, inode, |
612 | folio_buffers(folio), from, to, |
613 | NULL, fn: do_journal_get_write_access); |
614 | } |
615 | |
616 | if (ret) { |
617 | folio_unlock(folio); |
618 | folio_put(folio); |
619 | folio = NULL; |
620 | ext4_orphan_add(handle, inode); |
621 | ext4_write_unlock_xattr(inode, save: &no_expand); |
622 | sem_held = 0; |
623 | ext4_journal_stop(handle); |
624 | handle = NULL; |
625 | 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 | if (inode->i_nlink) |
633 | ext4_orphan_del(NULL, inode); |
634 | } |
635 | |
636 | if (ret == -ENOSPC && ext4_should_retry_alloc(sb: inode->i_sb, retries: &retries)) |
637 | goto retry; |
638 | |
639 | if (folio) |
640 | block_commit_write(page: &folio->page, from, to); |
641 | out: |
642 | if (folio) { |
643 | folio_unlock(folio); |
644 | folio_put(folio); |
645 | } |
646 | out_nofolio: |
647 | if (sem_held) |
648 | ext4_write_unlock_xattr(inode, save: &no_expand); |
649 | if (handle) |
650 | ext4_journal_stop(handle); |
651 | brelse(bh: 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 | 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 | int ret; |
667 | handle_t *handle; |
668 | struct folio *folio; |
669 | struct ext4_iloc iloc; |
670 | |
671 | if (pos + len > ext4_get_max_inline_size(inode)) |
672 | goto convert; |
673 | |
674 | ret = ext4_get_inode_loc(inode, &iloc); |
675 | 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 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
683 | if (IS_ERR(ptr: handle)) { |
684 | ret = PTR_ERR(ptr: handle); |
685 | handle = NULL; |
686 | goto out; |
687 | } |
688 | |
689 | ret = ext4_prepare_inline_data(handle, inode, len: pos + len); |
690 | if (ret && ret != -ENOSPC) |
691 | goto out; |
692 | |
693 | /* We don't have space in inline inode, so convert it to extent. */ |
694 | if (ret == -ENOSPC) { |
695 | ext4_journal_stop(handle); |
696 | brelse(bh: iloc.bh); |
697 | goto convert; |
698 | } |
699 | |
700 | ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, |
701 | EXT4_JTR_NONE); |
702 | if (ret) |
703 | goto out; |
704 | |
705 | folio = __filemap_get_folio(mapping, index: 0, FGP_WRITEBEGIN | FGP_NOFS, |
706 | gfp: mapping_gfp_mask(mapping)); |
707 | if (IS_ERR(ptr: folio)) { |
708 | ret = PTR_ERR(ptr: folio); |
709 | goto out; |
710 | } |
711 | |
712 | *pagep = &folio->page; |
713 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
714 | if (!ext4_has_inline_data(inode)) { |
715 | ret = 0; |
716 | folio_unlock(folio); |
717 | folio_put(folio); |
718 | goto out_up_read; |
719 | } |
720 | |
721 | if (!folio_test_uptodate(folio)) { |
722 | ret = ext4_read_inline_folio(inode, folio); |
723 | if (ret < 0) { |
724 | folio_unlock(folio); |
725 | folio_put(folio); |
726 | goto out_up_read; |
727 | } |
728 | } |
729 | |
730 | ret = 1; |
731 | handle = NULL; |
732 | out_up_read: |
733 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
734 | out: |
735 | if (handle && (ret != 1)) |
736 | ext4_journal_stop(handle); |
737 | brelse(bh: iloc.bh); |
738 | return ret; |
739 | convert: |
740 | return ext4_convert_inline_data_to_extent(mapping, inode); |
741 | } |
742 | |
743 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, |
744 | unsigned copied, struct folio *folio) |
745 | { |
746 | handle_t *handle = ext4_journal_current_handle(); |
747 | int no_expand; |
748 | void *kaddr; |
749 | struct ext4_iloc iloc; |
750 | int ret = 0, ret2; |
751 | |
752 | if (unlikely(copied < len) && !folio_test_uptodate(folio)) |
753 | copied = 0; |
754 | |
755 | if (likely(copied)) { |
756 | ret = ext4_get_inode_loc(inode, &iloc); |
757 | if (ret) { |
758 | folio_unlock(folio); |
759 | folio_put(folio); |
760 | ext4_std_error(inode->i_sb, ret); |
761 | goto out; |
762 | } |
763 | ext4_write_lock_xattr(inode, save: &no_expand); |
764 | 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 | (void) ext4_find_inline_data_nolock(inode); |
772 | |
773 | kaddr = kmap_local_folio(folio, offset: 0); |
774 | ext4_write_inline_data(inode, iloc: &iloc, buffer: kaddr, pos, len: copied); |
775 | kunmap_local(kaddr); |
776 | folio_mark_uptodate(folio); |
777 | /* clear dirty flag so that writepages wouldn't work for us. */ |
778 | folio_clear_dirty(folio); |
779 | |
780 | ext4_write_unlock_xattr(inode, save: &no_expand); |
781 | brelse(bh: 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 | ext4_update_inode_size(inode, newsize: pos + copied); |
789 | } |
790 | folio_unlock(folio); |
791 | 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 | if (likely(copied)) |
800 | mark_inode_dirty(inode); |
801 | 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 | if (pos + len > inode->i_size && ext4_can_truncate(inode)) |
807 | ext4_orphan_add(handle, inode); |
808 | |
809 | ret2 = ext4_journal_stop(handle); |
810 | if (!ret) |
811 | ret = ret2; |
812 | if (pos + len > inode->i_size) { |
813 | 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 | if (inode->i_nlink) |
820 | ext4_orphan_del(NULL, inode); |
821 | } |
822 | 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 | static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, |
835 | struct inode *inode, |
836 | void **fsdata) |
837 | { |
838 | int ret = 0, inline_size; |
839 | struct folio *folio; |
840 | |
841 | folio = __filemap_get_folio(mapping, index: 0, FGP_WRITEBEGIN, |
842 | gfp: mapping_gfp_mask(mapping)); |
843 | if (IS_ERR(ptr: folio)) |
844 | return PTR_ERR(ptr: folio); |
845 | |
846 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
847 | if (!ext4_has_inline_data(inode)) { |
848 | ext4_clear_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
849 | goto out; |
850 | } |
851 | |
852 | inline_size = ext4_get_inline_size(inode); |
853 | |
854 | if (!folio_test_uptodate(folio)) { |
855 | ret = ext4_read_inline_folio(inode, folio); |
856 | if (ret < 0) |
857 | goto out; |
858 | } |
859 | |
860 | ret = __block_write_begin(page: &folio->page, pos: 0, len: inline_size, |
861 | get_block: ext4_da_get_block_prep); |
862 | if (ret) { |
863 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
864 | folio_unlock(folio); |
865 | folio_put(folio); |
866 | ext4_truncate_failed_write(inode); |
867 | return ret; |
868 | } |
869 | |
870 | folio_mark_dirty(folio); |
871 | folio_mark_uptodate(folio); |
872 | ext4_clear_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
873 | *fsdata = (void *)CONVERT_INLINE_DATA; |
874 | |
875 | out: |
876 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
877 | if (folio) { |
878 | folio_unlock(folio); |
879 | 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 | 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 | int ret; |
899 | handle_t *handle; |
900 | struct folio *folio; |
901 | struct ext4_iloc iloc; |
902 | int retries = 0; |
903 | |
904 | ret = ext4_get_inode_loc(inode, &iloc); |
905 | if (ret) |
906 | return ret; |
907 | |
908 | retry_journal: |
909 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
910 | if (IS_ERR(ptr: handle)) { |
911 | ret = PTR_ERR(ptr: handle); |
912 | goto out; |
913 | } |
914 | |
915 | ret = ext4_prepare_inline_data(handle, inode, len: pos + len); |
916 | if (ret && ret != -ENOSPC) |
917 | goto out_journal; |
918 | |
919 | if (ret == -ENOSPC) { |
920 | ext4_journal_stop(handle); |
921 | ret = ext4_da_convert_inline_data_to_extent(mapping, |
922 | inode, |
923 | fsdata); |
924 | if (ret == -ENOSPC && |
925 | ext4_should_retry_alloc(sb: inode->i_sb, retries: &retries)) |
926 | goto retry_journal; |
927 | goto out; |
928 | } |
929 | |
930 | /* |
931 | * We cannot recurse into the filesystem as the transaction |
932 | * is already started. |
933 | */ |
934 | folio = __filemap_get_folio(mapping, index: 0, FGP_WRITEBEGIN | FGP_NOFS, |
935 | gfp: mapping_gfp_mask(mapping)); |
936 | if (IS_ERR(ptr: folio)) { |
937 | ret = PTR_ERR(ptr: folio); |
938 | goto out_journal; |
939 | } |
940 | |
941 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
942 | if (!ext4_has_inline_data(inode)) { |
943 | ret = 0; |
944 | goto out_release_page; |
945 | } |
946 | |
947 | if (!folio_test_uptodate(folio)) { |
948 | ret = ext4_read_inline_folio(inode, folio); |
949 | if (ret < 0) |
950 | goto out_release_page; |
951 | } |
952 | ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, |
953 | EXT4_JTR_NONE); |
954 | if (ret) |
955 | goto out_release_page; |
956 | |
957 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
958 | *pagep = &folio->page; |
959 | brelse(bh: iloc.bh); |
960 | return 1; |
961 | out_release_page: |
962 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
963 | folio_unlock(folio); |
964 | folio_put(folio); |
965 | out_journal: |
966 | ext4_journal_stop(handle); |
967 | out: |
968 | brelse(bh: 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 | 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 | int err; |
1013 | struct ext4_dir_entry_2 *de; |
1014 | |
1015 | err = ext4_find_dest_de(dir, inode, bh: iloc->bh, buf: inline_start, |
1016 | buf_size: inline_size, fname, dest_de: &de); |
1017 | if (err) |
1018 | return err; |
1019 | |
1020 | BUFFER_TRACE(iloc->bh, "get_write_access" ); |
1021 | err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh, |
1022 | EXT4_JTR_NONE); |
1023 | if (err) |
1024 | return err; |
1025 | ext4_insert_dentry(dir, inode, de, buf_size: inline_size, fname); |
1026 | |
1027 | 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 | inode_set_mtime_to_ts(inode: dir, ts: inode_set_ctime_current(inode: dir)); |
1041 | ext4_update_dx_flag(inode: dir); |
1042 | inode_inc_iversion(inode: dir); |
1043 | return 1; |
1044 | } |
1045 | |
1046 | static void *ext4_get_inline_xattr_pos(struct inode *inode, |
1047 | struct ext4_iloc *iloc) |
1048 | { |
1049 | struct ext4_xattr_entry *entry; |
1050 | struct ext4_xattr_ibody_header *; |
1051 | |
1052 | BUG_ON(!EXT4_I(inode)->i_inline_off); |
1053 | |
1054 | header = IHDR(inode, ext4_raw_inode(iloc)); |
1055 | entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + |
1056 | EXT4_I(inode)->i_inline_off); |
1057 | |
1058 | return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); |
1059 | } |
1060 | |
1061 | /* Set the final de to cover the whole block. */ |
1062 | static void ext4_update_final_de(void *de_buf, int old_size, int new_size) |
1063 | { |
1064 | struct ext4_dir_entry_2 *de, *prev_de; |
1065 | void *limit; |
1066 | int de_len; |
1067 | |
1068 | de = de_buf; |
1069 | if (old_size) { |
1070 | limit = de_buf + old_size; |
1071 | do { |
1072 | prev_de = de; |
1073 | de_len = ext4_rec_len_from_disk(dlen: de->rec_len, blocksize: old_size); |
1074 | de_buf += de_len; |
1075 | de = de_buf; |
1076 | } while (de_buf < limit); |
1077 | |
1078 | prev_de->rec_len = ext4_rec_len_to_disk(len: de_len + new_size - |
1079 | old_size, blocksize: new_size); |
1080 | } else { |
1081 | /* this is just created, so create an empty entry. */ |
1082 | de->inode = 0; |
1083 | de->rec_len = ext4_rec_len_to_disk(len: new_size, blocksize: new_size); |
1084 | } |
1085 | } |
1086 | |
1087 | static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, |
1088 | struct ext4_iloc *iloc) |
1089 | { |
1090 | int ret; |
1091 | int old_size = EXT4_I(inode: dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; |
1092 | int new_size = get_max_inline_xattr_value_size(inode: dir, iloc); |
1093 | |
1094 | if (new_size - old_size <= ext4_dir_rec_len(name_len: 1, NULL)) |
1095 | return -ENOSPC; |
1096 | |
1097 | ret = ext4_update_inline_data(handle, inode: dir, |
1098 | len: new_size + EXT4_MIN_INLINE_DATA_SIZE); |
1099 | if (ret) |
1100 | return ret; |
1101 | |
1102 | ext4_update_final_de(de_buf: ext4_get_inline_xattr_pos(inode: dir, iloc), old_size, |
1103 | new_size: EXT4_I(inode: dir)->i_inline_size - |
1104 | EXT4_MIN_INLINE_DATA_SIZE); |
1105 | dir->i_size = EXT4_I(inode: dir)->i_disksize = EXT4_I(inode: dir)->i_inline_size; |
1106 | return 0; |
1107 | } |
1108 | |
1109 | 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 | int ret; |
1114 | |
1115 | ret = ext4_create_inline_data(handle, inode, len: inline_size); |
1116 | if (ret) { |
1117 | 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 | return; |
1121 | } |
1122 | ext4_write_inline_data(inode, iloc, buffer: buf, pos: 0, len: inline_size); |
1123 | ext4_set_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
1124 | } |
1125 | |
1126 | 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 | int err, csum_size = 0, = 0; |
1133 | struct ext4_dir_entry_2 *de; |
1134 | 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 | de = target; |
1141 | de = ext4_init_dot_dotdot(inode, de, |
1142 | blocksize: inode->i_sb->s_blocksize, csum_size, |
1143 | le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), dotdot_real_len: 1); |
1144 | header_size = (void *)de - target; |
1145 | |
1146 | memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, |
1147 | inline_size - EXT4_INLINE_DOTDOT_SIZE); |
1148 | |
1149 | if (ext4_has_metadata_csum(sb: inode->i_sb)) |
1150 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1151 | |
1152 | inode->i_size = inode->i_sb->s_blocksize; |
1153 | i_size_write(inode, i_size: inode->i_sb->s_blocksize); |
1154 | EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; |
1155 | ext4_update_final_de(de_buf: dir_block->b_data, |
1156 | old_size: inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, |
1157 | new_size: inode->i_sb->s_blocksize - csum_size); |
1158 | |
1159 | if (csum_size) |
1160 | ext4_initialize_dirent_tail(bh: dir_block, |
1161 | blocksize: inode->i_sb->s_blocksize); |
1162 | set_buffer_uptodate(dir_block); |
1163 | unlock_buffer(bh: dir_block); |
1164 | err = ext4_handle_dirty_dirblock(handle, inode, bh: dir_block); |
1165 | if (err) |
1166 | return err; |
1167 | set_buffer_verified(dir_block); |
1168 | return ext4_mark_inode_dirty(handle, inode); |
1169 | } |
1170 | |
1171 | static int ext4_convert_inline_data_nolock(handle_t *handle, |
1172 | struct inode *inode, |
1173 | struct ext4_iloc *iloc) |
1174 | { |
1175 | int error; |
1176 | void *buf = NULL; |
1177 | struct buffer_head *data_bh = NULL; |
1178 | struct ext4_map_blocks map; |
1179 | int inline_size; |
1180 | |
1181 | inline_size = ext4_get_inline_size(inode); |
1182 | buf = kmalloc(size: inline_size, GFP_NOFS); |
1183 | if (!buf) { |
1184 | error = -ENOMEM; |
1185 | goto out; |
1186 | } |
1187 | |
1188 | error = ext4_read_inline_data(inode, buffer: buf, len: inline_size, iloc); |
1189 | if (error < 0) |
1190 | 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 | if (S_ISDIR(inode->i_mode)) { |
1197 | error = ext4_check_all_de(dir: inode, bh: iloc->bh, |
1198 | buf: buf + EXT4_INLINE_DOTDOT_SIZE, |
1199 | buf_size: inline_size - EXT4_INLINE_DOTDOT_SIZE); |
1200 | if (error) |
1201 | goto out; |
1202 | } |
1203 | |
1204 | error = ext4_destroy_inline_data_nolock(handle, inode); |
1205 | if (error) |
1206 | goto out; |
1207 | |
1208 | map.m_lblk = 0; |
1209 | map.m_len = 1; |
1210 | map.m_flags = 0; |
1211 | error = ext4_map_blocks(handle, inode, map: &map, EXT4_GET_BLOCKS_CREATE); |
1212 | if (error < 0) |
1213 | goto out_restore; |
1214 | if (!(map.m_flags & EXT4_MAP_MAPPED)) { |
1215 | error = -EIO; |
1216 | goto out_restore; |
1217 | } |
1218 | |
1219 | data_bh = sb_getblk(sb: inode->i_sb, block: map.m_pblk); |
1220 | if (!data_bh) { |
1221 | error = -ENOMEM; |
1222 | goto out_restore; |
1223 | } |
1224 | |
1225 | lock_buffer(bh: data_bh); |
1226 | error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh, |
1227 | EXT4_JTR_NONE); |
1228 | if (error) { |
1229 | unlock_buffer(bh: data_bh); |
1230 | error = -EIO; |
1231 | goto out_restore; |
1232 | } |
1233 | memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); |
1234 | |
1235 | if (!S_ISDIR(inode->i_mode)) { |
1236 | memcpy(data_bh->b_data, buf, inline_size); |
1237 | set_buffer_uptodate(data_bh); |
1238 | unlock_buffer(bh: data_bh); |
1239 | error = ext4_handle_dirty_metadata(handle, |
1240 | inode, data_bh); |
1241 | } else { |
1242 | error = ext4_finish_convert_inline_dir(handle, inode, dir_block: data_bh, |
1243 | buf, inline_size); |
1244 | } |
1245 | |
1246 | out_restore: |
1247 | if (error) |
1248 | ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); |
1249 | |
1250 | out: |
1251 | brelse(bh: data_bh); |
1252 | kfree(objp: buf); |
1253 | 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 | int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname, |
1262 | struct inode *dir, struct inode *inode) |
1263 | { |
1264 | int ret, ret2, inline_size, no_expand; |
1265 | void *inline_start; |
1266 | struct ext4_iloc iloc; |
1267 | |
1268 | ret = ext4_get_inode_loc(dir, &iloc); |
1269 | if (ret) |
1270 | return ret; |
1271 | |
1272 | ext4_write_lock_xattr(inode: dir, save: &no_expand); |
1273 | if (!ext4_has_inline_data(inode: dir)) |
1274 | goto out; |
1275 | |
1276 | inline_start = (void *)ext4_raw_inode(iloc: &iloc)->i_block + |
1277 | EXT4_INLINE_DOTDOT_SIZE; |
1278 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
1279 | |
1280 | ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, iloc: &iloc, |
1281 | inline_start, inline_size); |
1282 | if (ret != -ENOSPC) |
1283 | goto out; |
1284 | |
1285 | /* check whether it can be inserted to inline xattr space. */ |
1286 | inline_size = EXT4_I(inode: dir)->i_inline_size - |
1287 | EXT4_MIN_INLINE_DATA_SIZE; |
1288 | if (!inline_size) { |
1289 | /* Try to use the xattr space.*/ |
1290 | ret = ext4_update_inline_dir(handle, dir, iloc: &iloc); |
1291 | if (ret && ret != -ENOSPC) |
1292 | goto out; |
1293 | |
1294 | inline_size = EXT4_I(inode: dir)->i_inline_size - |
1295 | EXT4_MIN_INLINE_DATA_SIZE; |
1296 | } |
1297 | |
1298 | if (inline_size) { |
1299 | inline_start = ext4_get_inline_xattr_pos(inode: dir, iloc: &iloc); |
1300 | |
1301 | ret = ext4_add_dirent_to_inline(handle, fname, dir, |
1302 | inode, iloc: &iloc, inline_start, |
1303 | inline_size); |
1304 | |
1305 | if (ret != -ENOSPC) |
1306 | 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 | ret = ext4_convert_inline_data_nolock(handle, inode: dir, iloc: &iloc); |
1315 | |
1316 | out: |
1317 | ext4_write_unlock_xattr(inode: dir, save: &no_expand); |
1318 | ret2 = ext4_mark_inode_dirty(handle, dir); |
1319 | if (unlikely(ret2 && !ret)) |
1320 | ret = ret2; |
1321 | brelse(bh: 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 | 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 | int err = 0, count = 0; |
1337 | unsigned int parent_ino; |
1338 | int pos; |
1339 | struct ext4_dir_entry_2 *de; |
1340 | struct inode *inode = file_inode(f: dir_file); |
1341 | int ret, inline_size = 0; |
1342 | struct ext4_iloc iloc; |
1343 | void *dir_buf = NULL; |
1344 | struct ext4_dir_entry_2 fake; |
1345 | struct fscrypt_str tmp_str; |
1346 | |
1347 | ret = ext4_get_inode_loc(inode, &iloc); |
1348 | if (ret) |
1349 | return ret; |
1350 | |
1351 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
1352 | if (!ext4_has_inline_data(inode)) { |
1353 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1354 | *has_inline_data = 0; |
1355 | goto out; |
1356 | } |
1357 | |
1358 | inline_size = ext4_get_inline_size(inode); |
1359 | dir_buf = kmalloc(size: inline_size, GFP_NOFS); |
1360 | if (!dir_buf) { |
1361 | ret = -ENOMEM; |
1362 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1363 | goto out; |
1364 | } |
1365 | |
1366 | ret = ext4_read_inline_data(inode, buffer: dir_buf, len: inline_size, iloc: &iloc); |
1367 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1368 | if (ret < 0) |
1369 | goto out; |
1370 | |
1371 | pos = 0; |
1372 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
1373 | 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 | if (pos == 0) { |
1380 | fake.inode = cpu_to_le32(inode->i_ino); |
1381 | fake.name_len = 1; |
1382 | strcpy(p: fake.name, q: "." ); |
1383 | fake.rec_len = ext4_rec_len_to_disk( |
1384 | len: ext4_dir_rec_len(name_len: fake.name_len, NULL), |
1385 | blocksize: inline_size); |
1386 | ext4_set_de_type(sb: inode->i_sb, de: &fake, S_IFDIR); |
1387 | de = &fake; |
1388 | pos = EXT4_INLINE_DOTDOT_OFFSET; |
1389 | } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { |
1390 | fake.inode = cpu_to_le32(parent_ino); |
1391 | fake.name_len = 2; |
1392 | strcpy(p: fake.name, q: ".." ); |
1393 | fake.rec_len = ext4_rec_len_to_disk( |
1394 | len: ext4_dir_rec_len(name_len: fake.name_len, NULL), |
1395 | blocksize: inline_size); |
1396 | ext4_set_de_type(sb: inode->i_sb, de: &fake, S_IFDIR); |
1397 | de = &fake; |
1398 | pos = EXT4_INLINE_DOTDOT_SIZE; |
1399 | } else { |
1400 | de = (struct ext4_dir_entry_2 *)(dir_buf + pos); |
1401 | pos += ext4_rec_len_from_disk(dlen: de->rec_len, blocksize: inline_size); |
1402 | if (ext4_check_dir_entry(inode, dir_file, de, |
1403 | iloc.bh, dir_buf, |
1404 | inline_size, pos)) { |
1405 | ret = count; |
1406 | goto out; |
1407 | } |
1408 | } |
1409 | |
1410 | if (ext4_hash_in_dirent(inode: dir)) { |
1411 | hinfo->hash = EXT4_DIRENT_HASH(de); |
1412 | hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de); |
1413 | } else { |
1414 | ext4fs_dirhash(dir, name: de->name, len: de->name_len, hinfo); |
1415 | } |
1416 | if ((hinfo->hash < start_hash) || |
1417 | ((hinfo->hash == start_hash) && |
1418 | (hinfo->minor_hash < start_minor_hash))) |
1419 | continue; |
1420 | if (de->inode == 0) |
1421 | continue; |
1422 | tmp_str.name = de->name; |
1423 | tmp_str.len = de->name_len; |
1424 | err = ext4_htree_store_dirent(dir_file, hash: hinfo->hash, |
1425 | minor_hash: hinfo->minor_hash, dirent: de, ent_name: &tmp_str); |
1426 | if (err) { |
1427 | ret = err; |
1428 | goto out; |
1429 | } |
1430 | count++; |
1431 | } |
1432 | ret = count; |
1433 | out: |
1434 | kfree(objp: dir_buf); |
1435 | brelse(bh: 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 | int ext4_read_inline_dir(struct file *file, |
1448 | struct dir_context *ctx, |
1449 | int *has_inline_data) |
1450 | { |
1451 | unsigned int offset, parent_ino; |
1452 | int i; |
1453 | struct ext4_dir_entry_2 *de; |
1454 | struct super_block *sb; |
1455 | struct inode *inode = file_inode(f: file); |
1456 | int ret, inline_size = 0; |
1457 | struct ext4_iloc iloc; |
1458 | void *dir_buf = NULL; |
1459 | int dotdot_offset, dotdot_size, , ; |
1460 | |
1461 | ret = ext4_get_inode_loc(inode, &iloc); |
1462 | if (ret) |
1463 | return ret; |
1464 | |
1465 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
1466 | if (!ext4_has_inline_data(inode)) { |
1467 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1468 | *has_inline_data = 0; |
1469 | goto out; |
1470 | } |
1471 | |
1472 | inline_size = ext4_get_inline_size(inode); |
1473 | dir_buf = kmalloc(size: inline_size, GFP_NOFS); |
1474 | if (!dir_buf) { |
1475 | ret = -ENOMEM; |
1476 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1477 | goto out; |
1478 | } |
1479 | |
1480 | ret = ext4_read_inline_data(inode, buffer: dir_buf, len: inline_size, iloc: &iloc); |
1481 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1482 | if (ret < 0) |
1483 | goto out; |
1484 | |
1485 | ret = 0; |
1486 | sb = inode->i_sb; |
1487 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
1488 | 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 | dotdot_offset = ext4_dir_rec_len(name_len: 1, NULL); |
1498 | dotdot_size = dotdot_offset + ext4_dir_rec_len(name_len: 2, NULL); |
1499 | extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; |
1500 | 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 | if (!inode_eq_iversion(inode, old: file->f_version)) { |
1509 | for (i = 0; i < extra_size && i < offset;) { |
1510 | /* |
1511 | * "." is with offset 0 and |
1512 | * ".." is dotdot_offset. |
1513 | */ |
1514 | if (!i) { |
1515 | i = dotdot_offset; |
1516 | continue; |
1517 | } else if (i == dotdot_offset) { |
1518 | i = dotdot_size; |
1519 | continue; |
1520 | } |
1521 | /* for other entry, the real offset in |
1522 | * the buf has to be tuned accordingly. |
1523 | */ |
1524 | de = (struct ext4_dir_entry_2 *) |
1525 | (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 | if (ext4_rec_len_from_disk(dlen: de->rec_len, blocksize: extra_size) |
1533 | < ext4_dir_rec_len(name_len: 1, NULL)) |
1534 | break; |
1535 | i += ext4_rec_len_from_disk(dlen: de->rec_len, |
1536 | blocksize: extra_size); |
1537 | } |
1538 | offset = i; |
1539 | ctx->pos = offset; |
1540 | file->f_version = inode_query_iversion(inode); |
1541 | } |
1542 | |
1543 | while (ctx->pos < extra_size) { |
1544 | if (ctx->pos == 0) { |
1545 | if (!dir_emit(ctx, name: "." , namelen: 1, ino: inode->i_ino, DT_DIR)) |
1546 | goto out; |
1547 | ctx->pos = dotdot_offset; |
1548 | continue; |
1549 | } |
1550 | |
1551 | if (ctx->pos == dotdot_offset) { |
1552 | if (!dir_emit(ctx, name: ".." , namelen: 2, ino: parent_ino, DT_DIR)) |
1553 | goto out; |
1554 | ctx->pos = dotdot_size; |
1555 | continue; |
1556 | } |
1557 | |
1558 | de = (struct ext4_dir_entry_2 *) |
1559 | (dir_buf + ctx->pos - extra_offset); |
1560 | if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf, |
1561 | extra_size, ctx->pos)) |
1562 | goto out; |
1563 | if (le32_to_cpu(de->inode)) { |
1564 | if (!dir_emit(ctx, name: de->name, namelen: de->name_len, |
1565 | le32_to_cpu(de->inode), |
1566 | type: get_dtype(sb, filetype: de->file_type))) |
1567 | goto out; |
1568 | } |
1569 | ctx->pos += ext4_rec_len_from_disk(dlen: de->rec_len, blocksize: extra_size); |
1570 | } |
1571 | out: |
1572 | kfree(objp: dir_buf); |
1573 | brelse(bh: iloc.bh); |
1574 | return ret; |
1575 | } |
1576 | |
1577 | void *ext4_read_inline_link(struct inode *inode) |
1578 | { |
1579 | struct ext4_iloc iloc; |
1580 | int ret, inline_size; |
1581 | void *link; |
1582 | |
1583 | ret = ext4_get_inode_loc(inode, &iloc); |
1584 | if (ret) |
1585 | return ERR_PTR(error: ret); |
1586 | |
1587 | ret = -ENOMEM; |
1588 | inline_size = ext4_get_inline_size(inode); |
1589 | link = kmalloc(size: inline_size + 1, GFP_NOFS); |
1590 | if (!link) |
1591 | goto out; |
1592 | |
1593 | ret = ext4_read_inline_data(inode, buffer: link, len: inline_size, iloc: &iloc); |
1594 | if (ret < 0) { |
1595 | kfree(objp: link); |
1596 | goto out; |
1597 | } |
1598 | nd_terminate_link(name: link, len: inode->i_size, maxlen: ret); |
1599 | out: |
1600 | if (ret < 0) |
1601 | link = ERR_PTR(error: ret); |
1602 | brelse(bh: iloc.bh); |
1603 | return link; |
1604 | } |
1605 | |
1606 | struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
1607 | struct ext4_dir_entry_2 **parent_de, |
1608 | int *retval) |
1609 | { |
1610 | struct ext4_iloc iloc; |
1611 | |
1612 | *retval = ext4_get_inode_loc(inode, &iloc); |
1613 | if (*retval) |
1614 | return NULL; |
1615 | |
1616 | *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(iloc: &iloc)->i_block; |
1617 | |
1618 | 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 | int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, |
1627 | struct inode *inode) |
1628 | { |
1629 | int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
1630 | struct ext4_iloc iloc; |
1631 | struct ext4_dir_entry_2 *de; |
1632 | |
1633 | ret = ext4_get_inode_loc(inode, &iloc); |
1634 | if (ret) |
1635 | return ret; |
1636 | |
1637 | ret = ext4_prepare_inline_data(handle, inode, len: inline_size); |
1638 | if (ret) |
1639 | 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 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(iloc: &iloc)->i_block; |
1646 | de->inode = cpu_to_le32(parent->i_ino); |
1647 | de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); |
1648 | de->inode = 0; |
1649 | de->rec_len = ext4_rec_len_to_disk( |
1650 | len: inline_size - EXT4_INLINE_DOTDOT_SIZE, |
1651 | blocksize: inline_size); |
1652 | set_nlink(inode, nlink: 2); |
1653 | inode->i_size = EXT4_I(inode)->i_disksize = inline_size; |
1654 | out: |
1655 | brelse(bh: iloc.bh); |
1656 | return ret; |
1657 | } |
1658 | |
1659 | 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 | int ret; |
1665 | struct ext4_iloc iloc; |
1666 | void *inline_start; |
1667 | int inline_size; |
1668 | |
1669 | if (ext4_get_inode_loc(dir, &iloc)) |
1670 | return NULL; |
1671 | |
1672 | down_read(sem: &EXT4_I(inode: dir)->xattr_sem); |
1673 | if (!ext4_has_inline_data(inode: dir)) { |
1674 | *has_inline_data = 0; |
1675 | goto out; |
1676 | } |
1677 | |
1678 | inline_start = (void *)ext4_raw_inode(iloc: &iloc)->i_block + |
1679 | EXT4_INLINE_DOTDOT_SIZE; |
1680 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
1681 | ret = ext4_search_dir(bh: iloc.bh, search_buf: inline_start, buf_size: inline_size, |
1682 | dir, fname, offset: 0, res_dir); |
1683 | if (ret == 1) |
1684 | goto out_find; |
1685 | if (ret < 0) |
1686 | goto out; |
1687 | |
1688 | if (ext4_get_inline_size(inode: dir) == EXT4_MIN_INLINE_DATA_SIZE) |
1689 | goto out; |
1690 | |
1691 | inline_start = ext4_get_inline_xattr_pos(inode: dir, iloc: &iloc); |
1692 | inline_size = ext4_get_inline_size(inode: dir) - EXT4_MIN_INLINE_DATA_SIZE; |
1693 | |
1694 | ret = ext4_search_dir(bh: iloc.bh, search_buf: inline_start, buf_size: inline_size, |
1695 | dir, fname, offset: 0, res_dir); |
1696 | if (ret == 1) |
1697 | goto out_find; |
1698 | |
1699 | out: |
1700 | brelse(bh: iloc.bh); |
1701 | iloc.bh = NULL; |
1702 | out_find: |
1703 | up_read(sem: &EXT4_I(inode: dir)->xattr_sem); |
1704 | return iloc.bh; |
1705 | } |
1706 | |
1707 | 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 | int err, inline_size, no_expand; |
1714 | struct ext4_iloc iloc; |
1715 | void *inline_start; |
1716 | |
1717 | err = ext4_get_inode_loc(dir, &iloc); |
1718 | if (err) |
1719 | return err; |
1720 | |
1721 | ext4_write_lock_xattr(inode: dir, save: &no_expand); |
1722 | if (!ext4_has_inline_data(inode: dir)) { |
1723 | *has_inline_data = 0; |
1724 | goto out; |
1725 | } |
1726 | |
1727 | if ((void *)de_del - ((void *)ext4_raw_inode(iloc: &iloc)->i_block) < |
1728 | EXT4_MIN_INLINE_DATA_SIZE) { |
1729 | inline_start = (void *)ext4_raw_inode(iloc: &iloc)->i_block + |
1730 | EXT4_INLINE_DOTDOT_SIZE; |
1731 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - |
1732 | EXT4_INLINE_DOTDOT_SIZE; |
1733 | } else { |
1734 | inline_start = ext4_get_inline_xattr_pos(inode: dir, iloc: &iloc); |
1735 | inline_size = ext4_get_inline_size(inode: dir) - |
1736 | EXT4_MIN_INLINE_DATA_SIZE; |
1737 | } |
1738 | |
1739 | BUFFER_TRACE(bh, "get_write_access" ); |
1740 | err = ext4_journal_get_write_access(handle, dir->i_sb, bh, |
1741 | EXT4_JTR_NONE); |
1742 | if (err) |
1743 | goto out; |
1744 | |
1745 | err = ext4_generic_delete_entry(dir, de_del, bh, |
1746 | entry_buf: inline_start, buf_size: inline_size, csum_size: 0); |
1747 | if (err) |
1748 | goto out; |
1749 | |
1750 | ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); |
1751 | out: |
1752 | ext4_write_unlock_xattr(inode: dir, save: &no_expand); |
1753 | if (likely(err == 0)) |
1754 | err = ext4_mark_inode_dirty(handle, dir); |
1755 | brelse(bh: iloc.bh); |
1756 | if (err != -ENOENT) |
1757 | 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 | 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 | void *inline_pos; |
1772 | |
1773 | BUG_ON(offset > ext4_get_inline_size(inode)); |
1774 | |
1775 | if (offset < EXT4_MIN_INLINE_DATA_SIZE) { |
1776 | inline_pos = (void *)ext4_raw_inode(iloc)->i_block; |
1777 | *inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
1778 | } else { |
1779 | inline_pos = ext4_get_inline_xattr_pos(inode, iloc); |
1780 | offset -= EXT4_MIN_INLINE_DATA_SIZE; |
1781 | *inline_size = ext4_get_inline_size(inode) - |
1782 | EXT4_MIN_INLINE_DATA_SIZE; |
1783 | } |
1784 | |
1785 | if (inline_start) |
1786 | *inline_start = inline_pos; |
1787 | return (struct ext4_dir_entry_2 *)(inline_pos + offset); |
1788 | } |
1789 | |
1790 | bool empty_inline_dir(struct inode *dir, int *has_inline_data) |
1791 | { |
1792 | int err, inline_size; |
1793 | struct ext4_iloc iloc; |
1794 | size_t inline_len; |
1795 | void *inline_pos; |
1796 | unsigned int offset; |
1797 | struct ext4_dir_entry_2 *de; |
1798 | bool ret = false; |
1799 | |
1800 | err = ext4_get_inode_loc(dir, &iloc); |
1801 | if (err) { |
1802 | EXT4_ERROR_INODE_ERR(dir, -err, |
1803 | "error %d getting inode %lu block" , |
1804 | err, dir->i_ino); |
1805 | return false; |
1806 | } |
1807 | |
1808 | down_read(sem: &EXT4_I(inode: dir)->xattr_sem); |
1809 | if (!ext4_has_inline_data(inode: dir)) { |
1810 | *has_inline_data = 0; |
1811 | ret = true; |
1812 | goto out; |
1813 | } |
1814 | |
1815 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(iloc: &iloc)->i_block; |
1816 | if (!le32_to_cpu(de->inode)) { |
1817 | ext4_warning(dir->i_sb, |
1818 | "bad inline directory (dir #%lu) - no `..'" , |
1819 | dir->i_ino); |
1820 | goto out; |
1821 | } |
1822 | |
1823 | inline_len = ext4_get_inline_size(inode: dir); |
1824 | offset = EXT4_INLINE_DOTDOT_SIZE; |
1825 | while (offset < inline_len) { |
1826 | de = ext4_get_inline_entry(inode: dir, iloc: &iloc, offset, |
1827 | inline_start: &inline_pos, inline_size: &inline_size); |
1828 | if (ext4_check_dir_entry(dir, NULL, de, |
1829 | iloc.bh, inline_pos, |
1830 | inline_size, offset)) { |
1831 | 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 | goto out; |
1839 | } |
1840 | if (le32_to_cpu(de->inode)) { |
1841 | goto out; |
1842 | } |
1843 | offset += ext4_rec_len_from_disk(dlen: de->rec_len, blocksize: inline_size); |
1844 | } |
1845 | |
1846 | ret = true; |
1847 | out: |
1848 | up_read(sem: &EXT4_I(inode: dir)->xattr_sem); |
1849 | brelse(bh: iloc.bh); |
1850 | return ret; |
1851 | } |
1852 | |
1853 | int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
1854 | { |
1855 | int ret, no_expand; |
1856 | |
1857 | ext4_write_lock_xattr(inode, save: &no_expand); |
1858 | ret = ext4_destroy_inline_data_nolock(handle, inode); |
1859 | ext4_write_unlock_xattr(inode, save: &no_expand); |
1860 | |
1861 | return ret; |
1862 | } |
1863 | |
1864 | int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap) |
1865 | { |
1866 | __u64 addr; |
1867 | int error = -EAGAIN; |
1868 | struct ext4_iloc iloc; |
1869 | |
1870 | down_read(sem: &EXT4_I(inode)->xattr_sem); |
1871 | if (!ext4_has_inline_data(inode)) |
1872 | goto out; |
1873 | |
1874 | error = ext4_get_inode_loc(inode, &iloc); |
1875 | if (error) |
1876 | goto out; |
1877 | |
1878 | addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
1879 | addr += (char *)ext4_raw_inode(iloc: &iloc) - iloc.bh->b_data; |
1880 | addr += offsetof(struct ext4_inode, i_block); |
1881 | |
1882 | brelse(bh: iloc.bh); |
1883 | |
1884 | iomap->addr = addr; |
1885 | iomap->offset = 0; |
1886 | iomap->length = min_t(loff_t, ext4_get_inline_size(inode), |
1887 | i_size_read(inode)); |
1888 | iomap->type = IOMAP_INLINE; |
1889 | iomap->flags = 0; |
1890 | |
1891 | out: |
1892 | up_read(sem: &EXT4_I(inode)->xattr_sem); |
1893 | return error; |
1894 | } |
1895 | |
1896 | int ext4_inline_data_truncate(struct inode *inode, int *has_inline) |
1897 | { |
1898 | handle_t *handle; |
1899 | int inline_size, value_len, needed_blocks, no_expand, err = 0; |
1900 | size_t i_size; |
1901 | void *value = NULL; |
1902 | struct ext4_xattr_ibody_find is = { |
1903 | .s = { .not_found = -ENODATA, }, |
1904 | }; |
1905 | struct ext4_xattr_info i = { |
1906 | .name_index = EXT4_XATTR_INDEX_SYSTEM, |
1907 | .name = EXT4_XATTR_SYSTEM_DATA, |
1908 | }; |
1909 | |
1910 | |
1911 | needed_blocks = ext4_writepage_trans_blocks(inode); |
1912 | handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
1913 | if (IS_ERR(ptr: handle)) |
1914 | return PTR_ERR(ptr: handle); |
1915 | |
1916 | ext4_write_lock_xattr(inode, save: &no_expand); |
1917 | if (!ext4_has_inline_data(inode)) { |
1918 | ext4_write_unlock_xattr(inode, save: &no_expand); |
1919 | *has_inline = 0; |
1920 | ext4_journal_stop(handle); |
1921 | return 0; |
1922 | } |
1923 | |
1924 | if ((err = ext4_orphan_add(handle, inode)) != 0) |
1925 | goto out; |
1926 | |
1927 | if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0) |
1928 | goto out; |
1929 | |
1930 | down_write(sem: &EXT4_I(inode)->i_data_sem); |
1931 | i_size = inode->i_size; |
1932 | inline_size = ext4_get_inline_size(inode); |
1933 | EXT4_I(inode)->i_disksize = i_size; |
1934 | |
1935 | 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 | if (!ext4_test_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA)) |
1943 | ext4_es_remove_extent(inode, lblk: 0, EXT_MAX_BLOCKS); |
1944 | |
1945 | /* Clear the content in the xattr space. */ |
1946 | if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { |
1947 | if ((err = ext4_xattr_ibody_find(inode, i: &i, is: &is)) != 0) |
1948 | goto out_error; |
1949 | |
1950 | BUG_ON(is.s.not_found); |
1951 | |
1952 | value_len = le32_to_cpu(is.s.here->e_value_size); |
1953 | value = kmalloc(size: value_len, GFP_NOFS); |
1954 | if (!value) { |
1955 | err = -ENOMEM; |
1956 | goto out_error; |
1957 | } |
1958 | |
1959 | err = ext4_xattr_ibody_get(inode, name_index: i.name_index, |
1960 | name: i.name, buffer: value, buffer_size: value_len); |
1961 | if (err <= 0) |
1962 | goto out_error; |
1963 | |
1964 | i.value = value; |
1965 | i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? |
1966 | i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; |
1967 | err = ext4_xattr_ibody_set(handle, inode, i: &i, is: &is); |
1968 | if (err) |
1969 | goto out_error; |
1970 | } |
1971 | |
1972 | /* Clear the content within i_blocks. */ |
1973 | if (i_size < EXT4_MIN_INLINE_DATA_SIZE) { |
1974 | void *p = (void *) ext4_raw_inode(iloc: &is.iloc)->i_block; |
1975 | memset(p + i_size, 0, |
1976 | EXT4_MIN_INLINE_DATA_SIZE - i_size); |
1977 | } |
1978 | |
1979 | EXT4_I(inode)->i_inline_size = i_size < |
1980 | EXT4_MIN_INLINE_DATA_SIZE ? |
1981 | EXT4_MIN_INLINE_DATA_SIZE : i_size; |
1982 | } |
1983 | |
1984 | out_error: |
1985 | up_write(sem: &EXT4_I(inode)->i_data_sem); |
1986 | out: |
1987 | brelse(bh: is.iloc.bh); |
1988 | ext4_write_unlock_xattr(inode, save: &no_expand); |
1989 | kfree(objp: value); |
1990 | if (inode->i_nlink) |
1991 | ext4_orphan_del(handle, inode); |
1992 | |
1993 | if (err == 0) { |
1994 | inode_set_mtime_to_ts(inode, ts: inode_set_ctime_current(inode)); |
1995 | err = ext4_mark_inode_dirty(handle, inode); |
1996 | if (IS_SYNC(inode)) |
1997 | ext4_handle_sync(handle); |
1998 | } |
1999 | ext4_journal_stop(handle); |
2000 | return err; |
2001 | } |
2002 | |
2003 | int ext4_convert_inline_data(struct inode *inode) |
2004 | { |
2005 | int error, needed_blocks, no_expand; |
2006 | handle_t *handle; |
2007 | struct ext4_iloc iloc; |
2008 | |
2009 | if (!ext4_has_inline_data(inode)) { |
2010 | ext4_clear_inode_state(inode, bit: EXT4_STATE_MAY_INLINE_DATA); |
2011 | return 0; |
2012 | } else if (!ext4_test_inode_state(inode, bit: 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 | error = filemap_flush(inode->i_mapping); |
2020 | if (error) |
2021 | return error; |
2022 | if (!ext4_has_inline_data(inode)) |
2023 | return 0; |
2024 | } |
2025 | |
2026 | needed_blocks = ext4_writepage_trans_blocks(inode); |
2027 | |
2028 | iloc.bh = NULL; |
2029 | error = ext4_get_inode_loc(inode, &iloc); |
2030 | if (error) |
2031 | return error; |
2032 | |
2033 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
2034 | if (IS_ERR(ptr: handle)) { |
2035 | error = PTR_ERR(ptr: handle); |
2036 | goto out_free; |
2037 | } |
2038 | |
2039 | ext4_write_lock_xattr(inode, save: &no_expand); |
2040 | if (ext4_has_inline_data(inode)) |
2041 | error = ext4_convert_inline_data_nolock(handle, inode, iloc: &iloc); |
2042 | ext4_write_unlock_xattr(inode, save: &no_expand); |
2043 | ext4_journal_stop(handle); |
2044 | out_free: |
2045 | brelse(bh: iloc.bh); |
2046 | return error; |
2047 | } |
2048 | |