Commit | Line | Data |
---|---|---|
f5166768 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
67cf5b09 TM |
2 | /* |
3 | * Copyright (c) 2012 Taobao. | |
4 | * Written by Tao Ma <boyu.mt@taobao.com> | |
67cf5b09 | 5 | */ |
4bdfc873 | 6 | |
7046ae35 | 7 | #include <linux/iomap.h> |
4bdfc873 | 8 | #include <linux/fiemap.h> |
ee73f9a5 | 9 | #include <linux/iversion.h> |
4bdfc873 | 10 | |
67cf5b09 TM |
11 | #include "ext4_jbd2.h" |
12 | #include "ext4.h" | |
13 | #include "xattr.h" | |
f19d5870 | 14 | #include "truncate.h" |
67cf5b09 TM |
15 | |
16 | #define EXT4_XATTR_SYSTEM_DATA "data" | |
17 | #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) | |
8af0f082 TM |
18 | #define EXT4_INLINE_DOTDOT_OFFSET 2 |
19 | #define EXT4_INLINE_DOTDOT_SIZE 4 | |
67cf5b09 | 20 | |
c197855e | 21 | static int ext4_get_inline_size(struct inode *inode) |
67cf5b09 TM |
22 | { |
23 | if (EXT4_I(inode)->i_inline_off) | |
24 | return EXT4_I(inode)->i_inline_size; | |
25 | ||
26 | return 0; | |
27 | } | |
28 | ||
29 | static int get_max_inline_xattr_value_size(struct inode *inode, | |
30 | struct ext4_iloc *iloc) | |
31 | { | |
32 | struct ext4_xattr_ibody_header *header; | |
33 | struct ext4_xattr_entry *entry; | |
34 | struct ext4_inode *raw_inode; | |
35 | int free, min_offs; | |
36 | ||
37 | min_offs = EXT4_SB(inode->i_sb)->s_inode_size - | |
38 | EXT4_GOOD_OLD_INODE_SIZE - | |
39 | 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 | if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) | |
48 | return EXT4_XATTR_SIZE(min_offs - | |
49 | EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - | |
50 | EXT4_XATTR_ROUND - sizeof(__u32)); | |
51 | ||
52 | raw_inode = ext4_raw_inode(iloc); | |
53 | header = IHDR(inode, raw_inode); | |
54 | entry = IFIRST(header); | |
55 | ||
56 | /* Compute min_offs. */ | |
57 | for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { | |
e50e5129 | 58 | if (!entry->e_value_inum && entry->e_value_size) { |
67cf5b09 TM |
59 | size_t offs = le16_to_cpu(entry->e_value_offs); |
60 | if (offs < min_offs) | |
61 | min_offs = offs; | |
62 | } | |
63 | } | |
64 | free = min_offs - | |
65 | ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); | |
66 | ||
67 | if (EXT4_I(inode)->i_inline_off) { | |
68 | entry = (struct ext4_xattr_entry *) | |
69 | ((void *)raw_inode + EXT4_I(inode)->i_inline_off); | |
70 | ||
c4932dbe | 71 | free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); |
67cf5b09 TM |
72 | goto out; |
73 | } | |
74 | ||
75 | free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); | |
76 | ||
77 | if (free > EXT4_XATTR_ROUND) | |
78 | 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 | int ext4_get_max_inline_size(struct inode *inode) | |
92 | { | |
93 | int error, max_inline_size; | |
94 | struct ext4_iloc iloc; | |
95 | ||
96 | if (EXT4_I(inode)->i_extra_isize == 0) | |
97 | return 0; | |
98 | ||
99 | error = ext4_get_inode_loc(inode, &iloc); | |
100 | if (error) { | |
101 | ext4_error_inode(inode, __func__, __LINE__, 0, | |
102 | "can't get inode location %lu", | |
103 | inode->i_ino); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | down_read(&EXT4_I(inode)->xattr_sem); | |
108 | max_inline_size = get_max_inline_xattr_value_size(inode, &iloc); | |
109 | up_read(&EXT4_I(inode)->xattr_sem); | |
110 | ||
111 | brelse(iloc.bh); | |
112 | ||
113 | if (!max_inline_size) | |
114 | return 0; | |
115 | ||
116 | return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; | |
117 | } | |
118 | ||
67cf5b09 TM |
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 | int ext4_find_inline_data_nolock(struct inode *inode) | |
125 | { | |
126 | struct ext4_xattr_ibody_find is = { | |
127 | .s = { .not_found = -ENODATA, }, | |
128 | }; | |
129 | struct ext4_xattr_info i = { | |
130 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
131 | .name = EXT4_XATTR_SYSTEM_DATA, | |
132 | }; | |
133 | int error; | |
134 | ||
135 | if (EXT4_I(inode)->i_extra_isize == 0) | |
136 | return 0; | |
137 | ||
138 | error = ext4_get_inode_loc(inode, &is.iloc); | |
139 | if (error) | |
140 | return error; | |
141 | ||
142 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
143 | if (error) | |
144 | goto out; | |
145 | ||
146 | if (!is.s.not_found) { | |
147 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
148 | (void *)ext4_raw_inode(&is.iloc)); | |
149 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
150 | le32_to_cpu(is.s.here->e_value_size); | |
151 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
152 | } | |
153 | out: | |
154 | brelse(is.iloc.bh); | |
155 | return error; | |
156 | } | |
157 | ||
158 | static int ext4_read_inline_data(struct inode *inode, void *buffer, | |
159 | unsigned int len, | |
160 | struct ext4_iloc *iloc) | |
161 | { | |
162 | struct ext4_xattr_entry *entry; | |
163 | struct ext4_xattr_ibody_header *header; | |
164 | int cp_len = 0; | |
165 | struct ext4_inode *raw_inode; | |
166 | ||
167 | if (!len) | |
168 | return 0; | |
169 | ||
170 | BUG_ON(len > EXT4_I(inode)->i_inline_size); | |
171 | ||
172 | cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? | |
173 | len : EXT4_MIN_INLINE_DATA_SIZE; | |
174 | ||
175 | raw_inode = ext4_raw_inode(iloc); | |
176 | memcpy(buffer, (void *)(raw_inode->i_block), cp_len); | |
177 | ||
178 | len -= cp_len; | |
179 | buffer += cp_len; | |
180 | ||
181 | if (!len) | |
182 | goto out; | |
183 | ||
184 | header = IHDR(inode, raw_inode); | |
185 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
186 | EXT4_I(inode)->i_inline_off); | |
187 | len = min_t(unsigned int, len, | |
188 | (unsigned int)le32_to_cpu(entry->e_value_size)); | |
189 | ||
190 | memcpy(buffer, | |
191 | (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); | |
192 | cp_len += len; | |
193 | ||
194 | out: | |
195 | return cp_len; | |
196 | } | |
197 | ||
198 | /* | |
199 | * write the buffer to the inline inode. | |
200 | * If 'create' is set, we don't need to do the extra copy in the xattr | |
0d812f77 TM |
201 | * value since it is already handled by ext4_xattr_ibody_inline_set. |
202 | * That saves us one memcpy. | |
67cf5b09 | 203 | */ |
c197855e SH |
204 | static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, |
205 | void *buffer, loff_t pos, unsigned int len) | |
67cf5b09 TM |
206 | { |
207 | struct ext4_xattr_entry *entry; | |
208 | struct ext4_xattr_ibody_header *header; | |
209 | struct ext4_inode *raw_inode; | |
210 | int cp_len = 0; | |
211 | ||
0db1ff22 TT |
212 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
213 | return; | |
214 | ||
67cf5b09 TM |
215 | BUG_ON(!EXT4_I(inode)->i_inline_off); |
216 | BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); | |
217 | ||
218 | raw_inode = ext4_raw_inode(iloc); | |
219 | buffer += pos; | |
220 | ||
221 | if (pos < EXT4_MIN_INLINE_DATA_SIZE) { | |
222 | cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? | |
223 | EXT4_MIN_INLINE_DATA_SIZE - pos : len; | |
224 | memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); | |
225 | ||
226 | len -= cp_len; | |
227 | buffer += cp_len; | |
228 | pos += cp_len; | |
229 | } | |
230 | ||
231 | if (!len) | |
232 | return; | |
233 | ||
234 | pos -= EXT4_MIN_INLINE_DATA_SIZE; | |
235 | header = IHDR(inode, raw_inode); | |
236 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
237 | EXT4_I(inode)->i_inline_off); | |
238 | ||
239 | memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, | |
240 | buffer, len); | |
241 | } | |
242 | ||
243 | static int ext4_create_inline_data(handle_t *handle, | |
244 | struct inode *inode, unsigned len) | |
245 | { | |
246 | int error; | |
247 | void *value = NULL; | |
248 | struct ext4_xattr_ibody_find is = { | |
249 | .s = { .not_found = -ENODATA, }, | |
250 | }; | |
251 | struct ext4_xattr_info i = { | |
252 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
253 | .name = EXT4_XATTR_SYSTEM_DATA, | |
254 | }; | |
255 | ||
256 | error = ext4_get_inode_loc(inode, &is.iloc); | |
257 | if (error) | |
258 | return error; | |
259 | ||
5d601255 | 260 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
261 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
262 | if (error) | |
263 | goto out; | |
264 | ||
265 | if (len > EXT4_MIN_INLINE_DATA_SIZE) { | |
bd9926e8 | 266 | value = EXT4_ZERO_XATTR_VALUE; |
67cf5b09 TM |
267 | len -= EXT4_MIN_INLINE_DATA_SIZE; |
268 | } else { | |
269 | value = ""; | |
270 | len = 0; | |
271 | } | |
272 | ||
273 | /* Insert the the xttr entry. */ | |
274 | i.value = value; | |
275 | i.value_len = len; | |
276 | ||
277 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
278 | if (error) | |
279 | goto out; | |
280 | ||
281 | BUG_ON(!is.s.not_found); | |
282 | ||
0d812f77 | 283 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
284 | if (error) { |
285 | if (error == -ENOSPC) | |
286 | ext4_clear_inode_state(inode, | |
287 | EXT4_STATE_MAY_INLINE_DATA); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
292 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
293 | ||
294 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
295 | (void *)ext4_raw_inode(&is.iloc)); | |
296 | EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; | |
297 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
298 | ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
299 | get_bh(is.iloc.bh); | |
300 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
301 | ||
302 | out: | |
303 | brelse(is.iloc.bh); | |
304 | return error; | |
305 | } | |
306 | ||
307 | static int ext4_update_inline_data(handle_t *handle, struct inode *inode, | |
308 | unsigned int len) | |
309 | { | |
310 | int error; | |
311 | void *value = NULL; | |
312 | struct ext4_xattr_ibody_find is = { | |
313 | .s = { .not_found = -ENODATA, }, | |
314 | }; | |
315 | struct ext4_xattr_info i = { | |
316 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
317 | .name = EXT4_XATTR_SYSTEM_DATA, | |
318 | }; | |
319 | ||
320 | /* If the old space is ok, write the data directly. */ | |
321 | if (len <= EXT4_I(inode)->i_inline_size) | |
322 | return 0; | |
323 | ||
324 | error = ext4_get_inode_loc(inode, &is.iloc); | |
325 | if (error) | |
326 | return error; | |
327 | ||
328 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
329 | if (error) | |
330 | goto out; | |
331 | ||
332 | BUG_ON(is.s.not_found); | |
333 | ||
334 | len -= EXT4_MIN_INLINE_DATA_SIZE; | |
335 | value = kzalloc(len, GFP_NOFS); | |
578620f4 DC |
336 | if (!value) { |
337 | error = -ENOMEM; | |
67cf5b09 | 338 | goto out; |
578620f4 | 339 | } |
67cf5b09 TM |
340 | |
341 | error = ext4_xattr_ibody_get(inode, i.name_index, i.name, | |
342 | value, len); | |
343 | if (error == -ENODATA) | |
344 | goto out; | |
345 | ||
5d601255 | 346 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
347 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
348 | if (error) | |
349 | goto out; | |
350 | ||
351 | /* Update the xttr entry. */ | |
352 | i.value = value; | |
353 | i.value_len = len; | |
354 | ||
0d812f77 | 355 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
356 | if (error) |
357 | goto out; | |
358 | ||
359 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
360 | (void *)ext4_raw_inode(&is.iloc)); | |
361 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
362 | le32_to_cpu(is.s.here->e_value_size); | |
363 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
364 | get_bh(is.iloc.bh); | |
365 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
366 | ||
367 | out: | |
368 | kfree(value); | |
369 | brelse(is.iloc.bh); | |
370 | return error; | |
371 | } | |
372 | ||
c197855e SH |
373 | static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
374 | unsigned int len) | |
67cf5b09 | 375 | { |
c755e251 | 376 | int ret, size, no_expand; |
67cf5b09 TM |
377 | struct ext4_inode_info *ei = EXT4_I(inode); |
378 | ||
379 | if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) | |
380 | return -ENOSPC; | |
381 | ||
382 | size = ext4_get_max_inline_size(inode); | |
383 | if (size < len) | |
384 | return -ENOSPC; | |
385 | ||
c755e251 | 386 | ext4_write_lock_xattr(inode, &no_expand); |
67cf5b09 TM |
387 | |
388 | if (ei->i_inline_off) | |
389 | ret = ext4_update_inline_data(handle, inode, len); | |
390 | else | |
391 | ret = ext4_create_inline_data(handle, inode, len); | |
392 | ||
c755e251 | 393 | ext4_write_unlock_xattr(inode, &no_expand); |
67cf5b09 TM |
394 | return ret; |
395 | } | |
396 | ||
397 | static int ext4_destroy_inline_data_nolock(handle_t *handle, | |
398 | struct inode *inode) | |
399 | { | |
400 | struct ext4_inode_info *ei = EXT4_I(inode); | |
401 | struct ext4_xattr_ibody_find is = { | |
402 | .s = { .not_found = 0, }, | |
403 | }; | |
404 | struct ext4_xattr_info i = { | |
405 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
406 | .name = EXT4_XATTR_SYSTEM_DATA, | |
407 | .value = NULL, | |
408 | .value_len = 0, | |
409 | }; | |
410 | int error; | |
411 | ||
412 | if (!ei->i_inline_off) | |
413 | return 0; | |
414 | ||
415 | error = ext4_get_inode_loc(inode, &is.iloc); | |
416 | if (error) | |
417 | return error; | |
418 | ||
419 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
420 | if (error) | |
421 | goto out; | |
422 | ||
5d601255 | 423 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
424 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
425 | if (error) | |
426 | goto out; | |
427 | ||
0d812f77 | 428 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
429 | if (error) |
430 | goto out; | |
431 | ||
432 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
433 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
434 | ||
e2b911c5 | 435 | if (ext4_has_feature_extents(inode->i_sb)) { |
67cf5b09 TM |
436 | if (S_ISDIR(inode->i_mode) || |
437 | S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { | |
438 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); | |
439 | ext4_ext_tree_init(handle, inode); | |
440 | } | |
441 | } | |
442 | ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
443 | ||
444 | get_bh(is.iloc.bh); | |
445 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
446 | ||
447 | EXT4_I(inode)->i_inline_off = 0; | |
448 | EXT4_I(inode)->i_inline_size = 0; | |
449 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
450 | out: | |
451 | brelse(is.iloc.bh); | |
452 | if (error == -ENODATA) | |
453 | error = 0; | |
454 | return error; | |
455 | } | |
456 | ||
46c7f254 TM |
457 | static int ext4_read_inline_page(struct inode *inode, struct page *page) |
458 | { | |
459 | void *kaddr; | |
460 | int ret = 0; | |
461 | size_t len; | |
462 | struct ext4_iloc iloc; | |
463 | ||
464 | BUG_ON(!PageLocked(page)); | |
465 | BUG_ON(!ext4_has_inline_data(inode)); | |
466 | BUG_ON(page->index); | |
467 | ||
468 | if (!EXT4_I(inode)->i_inline_off) { | |
469 | ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", | |
470 | inode->i_ino); | |
471 | goto out; | |
472 | } | |
473 | ||
474 | ret = ext4_get_inode_loc(inode, &iloc); | |
475 | if (ret) | |
476 | goto out; | |
477 | ||
478 | len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); | |
479 | kaddr = kmap_atomic(page); | |
480 | ret = ext4_read_inline_data(inode, kaddr, len, &iloc); | |
481 | flush_dcache_page(page); | |
482 | kunmap_atomic(kaddr); | |
09cbfeaf | 483 | zero_user_segment(page, len, PAGE_SIZE); |
46c7f254 TM |
484 | SetPageUptodate(page); |
485 | brelse(iloc.bh); | |
486 | ||
487 | out: | |
488 | return ret; | |
489 | } | |
490 | ||
491 | int ext4_readpage_inline(struct inode *inode, struct page *page) | |
492 | { | |
493 | int ret = 0; | |
494 | ||
495 | down_read(&EXT4_I(inode)->xattr_sem); | |
496 | if (!ext4_has_inline_data(inode)) { | |
497 | up_read(&EXT4_I(inode)->xattr_sem); | |
498 | return -EAGAIN; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Current inline data can only exist in the 1st page, | |
503 | * So for all the other pages, just set them uptodate. | |
504 | */ | |
505 | if (!page->index) | |
506 | ret = ext4_read_inline_page(inode, page); | |
507 | else if (!PageUptodate(page)) { | |
09cbfeaf | 508 | zero_user_segment(page, 0, PAGE_SIZE); |
46c7f254 TM |
509 | SetPageUptodate(page); |
510 | } | |
511 | ||
512 | up_read(&EXT4_I(inode)->xattr_sem); | |
513 | ||
514 | unlock_page(page); | |
515 | return ret >= 0 ? 0 : ret; | |
516 | } | |
517 | ||
f19d5870 TM |
518 | static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
519 | struct inode *inode, | |
520 | unsigned flags) | |
521 | { | |
c755e251 | 522 | int ret, needed_blocks, no_expand; |
f19d5870 TM |
523 | handle_t *handle = NULL; |
524 | int retries = 0, sem_held = 0; | |
525 | struct page *page = NULL; | |
526 | unsigned from, to; | |
527 | struct ext4_iloc iloc; | |
528 | ||
529 | if (!ext4_has_inline_data(inode)) { | |
530 | /* | |
531 | * clear the flag so that no new write | |
532 | * will trap here again. | |
533 | */ | |
534 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
539 | ||
540 | ret = ext4_get_inode_loc(inode, &iloc); | |
541 | if (ret) | |
542 | return ret; | |
543 | ||
544 | retry: | |
9924a92a | 545 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
f19d5870 TM |
546 | if (IS_ERR(handle)) { |
547 | ret = PTR_ERR(handle); | |
548 | handle = NULL; | |
549 | goto out; | |
550 | } | |
551 | ||
552 | /* We cannot recurse into the filesystem as the transaction is already | |
553 | * started */ | |
554 | flags |= AOP_FLAG_NOFS; | |
555 | ||
556 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
557 | if (!page) { | |
558 | ret = -ENOMEM; | |
559 | goto out; | |
560 | } | |
561 | ||
c755e251 | 562 | ext4_write_lock_xattr(inode, &no_expand); |
f19d5870 TM |
563 | sem_held = 1; |
564 | /* If some one has already done this for us, just exit. */ | |
565 | if (!ext4_has_inline_data(inode)) { | |
566 | ret = 0; | |
567 | goto out; | |
568 | } | |
569 | ||
570 | from = 0; | |
571 | to = ext4_get_inline_size(inode); | |
572 | if (!PageUptodate(page)) { | |
573 | ret = ext4_read_inline_page(inode, page); | |
574 | if (ret < 0) | |
575 | goto out; | |
576 | } | |
577 | ||
578 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
579 | if (ret) | |
580 | goto out; | |
581 | ||
705965bd JK |
582 | if (ext4_should_dioread_nolock(inode)) { |
583 | ret = __block_write_begin(page, from, to, | |
584 | ext4_get_block_unwritten); | |
585 | } else | |
f19d5870 TM |
586 | ret = __block_write_begin(page, from, to, ext4_get_block); |
587 | ||
588 | if (!ret && ext4_should_journal_data(inode)) { | |
589 | ret = ext4_walk_page_buffers(handle, page_buffers(page), | |
590 | from, to, NULL, | |
591 | do_journal_get_write_access); | |
592 | } | |
593 | ||
594 | if (ret) { | |
595 | unlock_page(page); | |
09cbfeaf | 596 | put_page(page); |
684de574 | 597 | page = NULL; |
f19d5870 | 598 | ext4_orphan_add(handle, inode); |
c755e251 | 599 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 TM |
600 | sem_held = 0; |
601 | ext4_journal_stop(handle); | |
602 | handle = NULL; | |
603 | ext4_truncate_failed_write(inode); | |
604 | /* | |
605 | * If truncate failed early the inode might | |
606 | * still be on the orphan list; we need to | |
607 | * make sure the inode is removed from the | |
608 | * orphan list in that case. | |
609 | */ | |
610 | if (inode->i_nlink) | |
611 | ext4_orphan_del(NULL, inode); | |
612 | } | |
613 | ||
614 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
615 | goto retry; | |
616 | ||
684de574 DW |
617 | if (page) |
618 | block_commit_write(page, from, to); | |
f19d5870 TM |
619 | out: |
620 | if (page) { | |
621 | unlock_page(page); | |
09cbfeaf | 622 | put_page(page); |
f19d5870 TM |
623 | } |
624 | if (sem_held) | |
c755e251 | 625 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 TM |
626 | if (handle) |
627 | ext4_journal_stop(handle); | |
628 | brelse(iloc.bh); | |
629 | return ret; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Try to write data in the inode. | |
634 | * If the inode has inline data, check whether the new write can be | |
635 | * in the inode also. If not, create the page the handle, move the data | |
636 | * to the page make it update and let the later codes create extent for it. | |
637 | */ | |
638 | int ext4_try_to_write_inline_data(struct address_space *mapping, | |
639 | struct inode *inode, | |
640 | loff_t pos, unsigned len, | |
641 | unsigned flags, | |
642 | struct page **pagep) | |
643 | { | |
644 | int ret; | |
645 | handle_t *handle; | |
646 | struct page *page; | |
647 | struct ext4_iloc iloc; | |
648 | ||
649 | if (pos + len > ext4_get_max_inline_size(inode)) | |
650 | goto convert; | |
651 | ||
652 | ret = ext4_get_inode_loc(inode, &iloc); | |
653 | if (ret) | |
654 | return ret; | |
655 | ||
656 | /* | |
657 | * The possible write could happen in the inode, | |
658 | * so try to reserve the space in inode first. | |
659 | */ | |
9924a92a | 660 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
f19d5870 TM |
661 | if (IS_ERR(handle)) { |
662 | ret = PTR_ERR(handle); | |
663 | handle = NULL; | |
664 | goto out; | |
665 | } | |
666 | ||
667 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
668 | if (ret && ret != -ENOSPC) | |
669 | goto out; | |
670 | ||
671 | /* We don't have space in inline inode, so convert it to extent. */ | |
672 | if (ret == -ENOSPC) { | |
673 | ext4_journal_stop(handle); | |
674 | brelse(iloc.bh); | |
675 | goto convert; | |
676 | } | |
677 | ||
678 | flags |= AOP_FLAG_NOFS; | |
679 | ||
680 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
681 | if (!page) { | |
682 | ret = -ENOMEM; | |
683 | goto out; | |
684 | } | |
685 | ||
686 | *pagep = page; | |
687 | down_read(&EXT4_I(inode)->xattr_sem); | |
688 | if (!ext4_has_inline_data(inode)) { | |
689 | ret = 0; | |
690 | unlock_page(page); | |
09cbfeaf | 691 | put_page(page); |
f19d5870 TM |
692 | goto out_up_read; |
693 | } | |
694 | ||
695 | if (!PageUptodate(page)) { | |
696 | ret = ext4_read_inline_page(inode, page); | |
697 | if (ret < 0) | |
698 | goto out_up_read; | |
699 | } | |
700 | ||
701 | ret = 1; | |
702 | handle = NULL; | |
703 | out_up_read: | |
704 | up_read(&EXT4_I(inode)->xattr_sem); | |
705 | out: | |
706 | if (handle) | |
707 | ext4_journal_stop(handle); | |
708 | brelse(iloc.bh); | |
709 | return ret; | |
710 | convert: | |
711 | return ext4_convert_inline_data_to_extent(mapping, | |
712 | inode, flags); | |
713 | } | |
714 | ||
715 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, | |
716 | unsigned copied, struct page *page) | |
717 | { | |
c755e251 | 718 | int ret, no_expand; |
f19d5870 TM |
719 | void *kaddr; |
720 | struct ext4_iloc iloc; | |
721 | ||
722 | if (unlikely(copied < len)) { | |
723 | if (!PageUptodate(page)) { | |
724 | copied = 0; | |
725 | goto out; | |
726 | } | |
727 | } | |
728 | ||
729 | ret = ext4_get_inode_loc(inode, &iloc); | |
730 | if (ret) { | |
731 | ext4_std_error(inode->i_sb, ret); | |
732 | copied = 0; | |
733 | goto out; | |
734 | } | |
735 | ||
c755e251 | 736 | ext4_write_lock_xattr(inode, &no_expand); |
f19d5870 TM |
737 | BUG_ON(!ext4_has_inline_data(inode)); |
738 | ||
739 | kaddr = kmap_atomic(page); | |
740 | ext4_write_inline_data(inode, &iloc, kaddr, pos, len); | |
741 | kunmap_atomic(kaddr); | |
742 | SetPageUptodate(page); | |
743 | /* clear page dirty so that writepages wouldn't work for us. */ | |
744 | ClearPageDirty(page); | |
745 | ||
c755e251 | 746 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 TM |
747 | brelse(iloc.bh); |
748 | out: | |
749 | return copied; | |
750 | } | |
751 | ||
3fdcfb66 TM |
752 | struct buffer_head * |
753 | ext4_journalled_write_inline_data(struct inode *inode, | |
754 | unsigned len, | |
755 | struct page *page) | |
756 | { | |
c755e251 | 757 | int ret, no_expand; |
3fdcfb66 TM |
758 | void *kaddr; |
759 | struct ext4_iloc iloc; | |
760 | ||
761 | ret = ext4_get_inode_loc(inode, &iloc); | |
762 | if (ret) { | |
763 | ext4_std_error(inode->i_sb, ret); | |
764 | return NULL; | |
765 | } | |
766 | ||
c755e251 | 767 | ext4_write_lock_xattr(inode, &no_expand); |
3fdcfb66 TM |
768 | kaddr = kmap_atomic(page); |
769 | ext4_write_inline_data(inode, &iloc, kaddr, 0, len); | |
770 | kunmap_atomic(kaddr); | |
c755e251 | 771 | ext4_write_unlock_xattr(inode, &no_expand); |
3fdcfb66 TM |
772 | |
773 | return iloc.bh; | |
774 | } | |
775 | ||
9c3569b5 TM |
776 | /* |
777 | * Try to make the page cache and handle ready for the inline data case. | |
778 | * We can call this function in 2 cases: | |
779 | * 1. The inode is created and the first write exceeds inline size. We can | |
780 | * clear the inode state safely. | |
781 | * 2. The inode has inline data, then we need to read the data, make it | |
782 | * update and dirty so that ext4_da_writepages can handle it. We don't | |
783 | * need to start the journal since the file's metatdata isn't changed now. | |
784 | */ | |
785 | static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, | |
786 | struct inode *inode, | |
787 | unsigned flags, | |
788 | void **fsdata) | |
789 | { | |
790 | int ret = 0, inline_size; | |
791 | struct page *page; | |
792 | ||
793 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
794 | if (!page) | |
795 | return -ENOMEM; | |
796 | ||
797 | down_read(&EXT4_I(inode)->xattr_sem); | |
798 | if (!ext4_has_inline_data(inode)) { | |
799 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
800 | goto out; | |
801 | } | |
802 | ||
803 | inline_size = ext4_get_inline_size(inode); | |
804 | ||
805 | if (!PageUptodate(page)) { | |
806 | ret = ext4_read_inline_page(inode, page); | |
807 | if (ret < 0) | |
808 | goto out; | |
809 | } | |
810 | ||
811 | ret = __block_write_begin(page, 0, inline_size, | |
812 | ext4_da_get_block_prep); | |
813 | if (ret) { | |
50db71ab DM |
814 | up_read(&EXT4_I(inode)->xattr_sem); |
815 | unlock_page(page); | |
09cbfeaf | 816 | put_page(page); |
9c3569b5 | 817 | ext4_truncate_failed_write(inode); |
50db71ab | 818 | return ret; |
9c3569b5 TM |
819 | } |
820 | ||
821 | SetPageDirty(page); | |
822 | SetPageUptodate(page); | |
823 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
824 | *fsdata = (void *)CONVERT_INLINE_DATA; | |
825 | ||
826 | out: | |
827 | up_read(&EXT4_I(inode)->xattr_sem); | |
828 | if (page) { | |
829 | unlock_page(page); | |
09cbfeaf | 830 | put_page(page); |
9c3569b5 TM |
831 | } |
832 | return ret; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Prepare the write for the inline data. | |
837 | * If the the data can be written into the inode, we just read | |
838 | * the page and make it uptodate, and start the journal. | |
839 | * Otherwise read the page, makes it dirty so that it can be | |
840 | * handle in writepages(the i_disksize update is left to the | |
841 | * normal ext4_da_write_end). | |
842 | */ | |
843 | int ext4_da_write_inline_data_begin(struct address_space *mapping, | |
844 | struct inode *inode, | |
845 | loff_t pos, unsigned len, | |
846 | unsigned flags, | |
847 | struct page **pagep, | |
848 | void **fsdata) | |
849 | { | |
850 | int ret, inline_size; | |
851 | handle_t *handle; | |
852 | struct page *page; | |
853 | struct ext4_iloc iloc; | |
bc0ca9df | 854 | int retries; |
9c3569b5 TM |
855 | |
856 | ret = ext4_get_inode_loc(inode, &iloc); | |
857 | if (ret) | |
858 | return ret; | |
859 | ||
bc0ca9df | 860 | retry_journal: |
9924a92a | 861 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
9c3569b5 TM |
862 | if (IS_ERR(handle)) { |
863 | ret = PTR_ERR(handle); | |
9c3569b5 TM |
864 | goto out; |
865 | } | |
866 | ||
867 | inline_size = ext4_get_max_inline_size(inode); | |
868 | ||
869 | ret = -ENOSPC; | |
870 | if (inline_size >= pos + len) { | |
871 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
872 | if (ret && ret != -ENOSPC) | |
52e44777 | 873 | goto out_journal; |
9c3569b5 TM |
874 | } |
875 | ||
5cc28a9e DM |
876 | /* |
877 | * We cannot recurse into the filesystem as the transaction | |
878 | * is already started. | |
879 | */ | |
880 | flags |= AOP_FLAG_NOFS; | |
881 | ||
9c3569b5 TM |
882 | if (ret == -ENOSPC) { |
883 | ret = ext4_da_convert_inline_data_to_extent(mapping, | |
884 | inode, | |
885 | flags, | |
886 | fsdata); | |
bc0ca9df | 887 | ext4_journal_stop(handle); |
bc0ca9df JK |
888 | if (ret == -ENOSPC && |
889 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
890 | goto retry_journal; | |
9c3569b5 TM |
891 | goto out; |
892 | } | |
893 | ||
9c3569b5 TM |
894 | |
895 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
896 | if (!page) { | |
897 | ret = -ENOMEM; | |
52e44777 | 898 | goto out_journal; |
9c3569b5 TM |
899 | } |
900 | ||
901 | down_read(&EXT4_I(inode)->xattr_sem); | |
902 | if (!ext4_has_inline_data(inode)) { | |
903 | ret = 0; | |
904 | goto out_release_page; | |
905 | } | |
906 | ||
907 | if (!PageUptodate(page)) { | |
908 | ret = ext4_read_inline_page(inode, page); | |
909 | if (ret < 0) | |
910 | goto out_release_page; | |
911 | } | |
912 | ||
913 | up_read(&EXT4_I(inode)->xattr_sem); | |
914 | *pagep = page; | |
9c3569b5 TM |
915 | brelse(iloc.bh); |
916 | return 1; | |
917 | out_release_page: | |
918 | up_read(&EXT4_I(inode)->xattr_sem); | |
919 | unlock_page(page); | |
09cbfeaf | 920 | put_page(page); |
52e44777 JK |
921 | out_journal: |
922 | ext4_journal_stop(handle); | |
9c3569b5 | 923 | out: |
9c3569b5 TM |
924 | brelse(iloc.bh); |
925 | return ret; | |
926 | } | |
927 | ||
928 | int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, | |
929 | unsigned len, unsigned copied, | |
930 | struct page *page) | |
931 | { | |
932 | int i_size_changed = 0; | |
eb5efbcb | 933 | int ret; |
9c3569b5 | 934 | |
eb5efbcb TT |
935 | ret = ext4_write_inline_data_end(inode, pos, len, copied, page); |
936 | if (ret < 0) { | |
937 | unlock_page(page); | |
938 | put_page(page); | |
939 | return ret; | |
940 | } | |
941 | copied = ret; | |
9c3569b5 TM |
942 | |
943 | /* | |
944 | * No need to use i_size_read() here, the i_size | |
945 | * cannot change under us because we hold i_mutex. | |
946 | * | |
947 | * But it's important to update i_size while still holding page lock: | |
948 | * page writeout could otherwise come in and zero beyond i_size. | |
949 | */ | |
950 | if (pos+copied > inode->i_size) { | |
951 | i_size_write(inode, pos+copied); | |
952 | i_size_changed = 1; | |
953 | } | |
954 | unlock_page(page); | |
09cbfeaf | 955 | put_page(page); |
9c3569b5 TM |
956 | |
957 | /* | |
958 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
959 | * makes the holding time of page lock longer. Second, it forces lock | |
960 | * ordering of page lock and transaction start for journaling | |
961 | * filesystems. | |
962 | */ | |
963 | if (i_size_changed) | |
964 | mark_inode_dirty(inode); | |
965 | ||
966 | return copied; | |
967 | } | |
f19d5870 | 968 | |
3c47d541 TM |
969 | #ifdef INLINE_DIR_DEBUG |
970 | void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, | |
971 | void *inline_start, int inline_size) | |
972 | { | |
973 | int offset; | |
974 | unsigned short de_len; | |
975 | struct ext4_dir_entry_2 *de = inline_start; | |
976 | void *dlimit = inline_start + inline_size; | |
977 | ||
978 | trace_printk("inode %lu\n", dir->i_ino); | |
979 | offset = 0; | |
980 | while ((void *)de < dlimit) { | |
981 | de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); | |
80cfb71e | 982 | trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n", |
3c47d541 TM |
983 | offset, de_len, de->name_len, de->name, |
984 | de->name_len, le32_to_cpu(de->inode)); | |
985 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
986 | inline_start, inline_size, offset)) | |
987 | BUG(); | |
988 | ||
989 | offset += de_len; | |
990 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); | |
991 | } | |
992 | } | |
993 | #else | |
994 | #define ext4_show_inline_dir(dir, bh, inline_start, inline_size) | |
995 | #endif | |
996 | ||
997 | /* | |
998 | * Add a new entry into a inline dir. | |
999 | * It will return -ENOSPC if no space is available, and -EIO | |
1000 | * and -EEXIST if directory entry already exists. | |
1001 | */ | |
1002 | static int ext4_add_dirent_to_inline(handle_t *handle, | |
5b643f9c | 1003 | struct ext4_filename *fname, |
56a04915 | 1004 | struct inode *dir, |
3c47d541 TM |
1005 | struct inode *inode, |
1006 | struct ext4_iloc *iloc, | |
1007 | void *inline_start, int inline_size) | |
1008 | { | |
3c47d541 TM |
1009 | int err; |
1010 | struct ext4_dir_entry_2 *de; | |
1011 | ||
5b643f9c TT |
1012 | err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start, |
1013 | inline_size, fname, &de); | |
3c47d541 TM |
1014 | if (err) |
1015 | return err; | |
1016 | ||
5d601255 | 1017 | BUFFER_TRACE(iloc->bh, "get_write_access"); |
3c47d541 TM |
1018 | err = ext4_journal_get_write_access(handle, iloc->bh); |
1019 | if (err) | |
1020 | return err; | |
1bc0af60 | 1021 | ext4_insert_dentry(inode, de, inline_size, fname); |
3c47d541 TM |
1022 | |
1023 | ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); | |
1024 | ||
1025 | /* | |
1026 | * XXX shouldn't update any times until successful | |
1027 | * completion of syscall, but too many callers depend | |
1028 | * on this. | |
1029 | * | |
1030 | * XXX similarly, too many callers depend on | |
1031 | * ext4_new_inode() setting the times, but error | |
1032 | * recovery deletes the inode, so the worst that can | |
1033 | * happen is that the times are slightly out of date | |
1034 | * and/or different from the directory change time. | |
1035 | */ | |
eeca7ea1 | 1036 | dir->i_mtime = dir->i_ctime = current_time(dir); |
3c47d541 | 1037 | ext4_update_dx_flag(dir); |
ee73f9a5 | 1038 | inode_inc_iversion(dir); |
3c47d541 TM |
1039 | return 1; |
1040 | } | |
1041 | ||
1042 | static void *ext4_get_inline_xattr_pos(struct inode *inode, | |
1043 | struct ext4_iloc *iloc) | |
1044 | { | |
1045 | struct ext4_xattr_entry *entry; | |
1046 | struct ext4_xattr_ibody_header *header; | |
1047 | ||
1048 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
1049 | ||
1050 | header = IHDR(inode, ext4_raw_inode(iloc)); | |
1051 | entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + | |
1052 | EXT4_I(inode)->i_inline_off); | |
1053 | ||
1054 | return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); | |
1055 | } | |
1056 | ||
1057 | /* Set the final de to cover the whole block. */ | |
1058 | static void ext4_update_final_de(void *de_buf, int old_size, int new_size) | |
1059 | { | |
1060 | struct ext4_dir_entry_2 *de, *prev_de; | |
1061 | void *limit; | |
1062 | int de_len; | |
1063 | ||
1064 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1065 | if (old_size) { | |
1066 | limit = de_buf + old_size; | |
1067 | do { | |
1068 | prev_de = de; | |
1069 | de_len = ext4_rec_len_from_disk(de->rec_len, old_size); | |
1070 | de_buf += de_len; | |
1071 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1072 | } while (de_buf < limit); | |
1073 | ||
1074 | prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - | |
1075 | old_size, new_size); | |
1076 | } else { | |
1077 | /* this is just created, so create an empty entry. */ | |
1078 | de->inode = 0; | |
1079 | de->rec_len = ext4_rec_len_to_disk(new_size, new_size); | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, | |
1084 | struct ext4_iloc *iloc) | |
1085 | { | |
1086 | int ret; | |
1087 | int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; | |
1088 | int new_size = get_max_inline_xattr_value_size(dir, iloc); | |
1089 | ||
1090 | if (new_size - old_size <= EXT4_DIR_REC_LEN(1)) | |
1091 | return -ENOSPC; | |
1092 | ||
1093 | ret = ext4_update_inline_data(handle, dir, | |
1094 | new_size + EXT4_MIN_INLINE_DATA_SIZE); | |
1095 | if (ret) | |
1096 | return ret; | |
1097 | ||
1098 | ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, | |
1099 | EXT4_I(dir)->i_inline_size - | |
1100 | EXT4_MIN_INLINE_DATA_SIZE); | |
1101 | dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; | |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, | |
1106 | struct ext4_iloc *iloc, | |
1107 | void *buf, int inline_size) | |
1108 | { | |
1109 | ext4_create_inline_data(handle, inode, inline_size); | |
1110 | ext4_write_inline_data(inode, iloc, buf, 0, inline_size); | |
1111 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1112 | } | |
1113 | ||
1114 | static int ext4_finish_convert_inline_dir(handle_t *handle, | |
1115 | struct inode *inode, | |
1116 | struct buffer_head *dir_block, | |
1117 | void *buf, | |
1118 | int inline_size) | |
1119 | { | |
1120 | int err, csum_size = 0, header_size = 0; | |
1121 | struct ext4_dir_entry_2 *de; | |
1122 | struct ext4_dir_entry_tail *t; | |
1123 | void *target = dir_block->b_data; | |
1124 | ||
1125 | /* | |
1126 | * First create "." and ".." and then copy the dir information | |
1127 | * back to the block. | |
1128 | */ | |
1129 | de = (struct ext4_dir_entry_2 *)target; | |
1130 | de = ext4_init_dot_dotdot(inode, de, | |
1131 | inode->i_sb->s_blocksize, csum_size, | |
1132 | le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); | |
1133 | header_size = (void *)de - target; | |
1134 | ||
1135 | memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, | |
1136 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1137 | ||
9aa5d32b | 1138 | if (ext4_has_metadata_csum(inode->i_sb)) |
3c47d541 TM |
1139 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1140 | ||
1141 | inode->i_size = inode->i_sb->s_blocksize; | |
1142 | i_size_write(inode, inode->i_sb->s_blocksize); | |
1143 | EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; | |
1144 | ext4_update_final_de(dir_block->b_data, | |
1145 | inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, | |
1146 | inode->i_sb->s_blocksize - csum_size); | |
1147 | ||
1148 | if (csum_size) { | |
1149 | t = EXT4_DIRENT_TAIL(dir_block->b_data, | |
1150 | inode->i_sb->s_blocksize); | |
1151 | initialize_dirent_tail(t, inode->i_sb->s_blocksize); | |
1152 | } | |
1153 | set_buffer_uptodate(dir_block); | |
1154 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
1155 | if (err) | |
b9cf625d | 1156 | return err; |
3c47d541 | 1157 | set_buffer_verified(dir_block); |
b9cf625d | 1158 | return ext4_mark_inode_dirty(handle, inode); |
3c47d541 TM |
1159 | } |
1160 | ||
1161 | static int ext4_convert_inline_data_nolock(handle_t *handle, | |
1162 | struct inode *inode, | |
1163 | struct ext4_iloc *iloc) | |
1164 | { | |
1165 | int error; | |
1166 | void *buf = NULL; | |
1167 | struct buffer_head *data_bh = NULL; | |
1168 | struct ext4_map_blocks map; | |
1169 | int inline_size; | |
1170 | ||
1171 | inline_size = ext4_get_inline_size(inode); | |
1172 | buf = kmalloc(inline_size, GFP_NOFS); | |
1173 | if (!buf) { | |
1174 | error = -ENOMEM; | |
1175 | goto out; | |
1176 | } | |
1177 | ||
1178 | error = ext4_read_inline_data(inode, buf, inline_size, iloc); | |
1179 | if (error < 0) | |
1180 | goto out; | |
1181 | ||
40b163f1 DW |
1182 | /* |
1183 | * Make sure the inline directory entries pass checks before we try to | |
1184 | * convert them, so that we avoid touching stuff that needs fsck. | |
1185 | */ | |
1186 | if (S_ISDIR(inode->i_mode)) { | |
1187 | error = ext4_check_all_de(inode, iloc->bh, | |
1188 | buf + EXT4_INLINE_DOTDOT_SIZE, | |
1189 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1190 | if (error) | |
1191 | goto out; | |
1192 | } | |
1193 | ||
3c47d541 TM |
1194 | error = ext4_destroy_inline_data_nolock(handle, inode); |
1195 | if (error) | |
1196 | goto out; | |
1197 | ||
1198 | map.m_lblk = 0; | |
1199 | map.m_len = 1; | |
1200 | map.m_flags = 0; | |
1201 | error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE); | |
1202 | if (error < 0) | |
1203 | goto out_restore; | |
1204 | if (!(map.m_flags & EXT4_MAP_MAPPED)) { | |
1205 | error = -EIO; | |
1206 | goto out_restore; | |
1207 | } | |
1208 | ||
1209 | data_bh = sb_getblk(inode->i_sb, map.m_pblk); | |
1210 | if (!data_bh) { | |
860d21e2 | 1211 | error = -ENOMEM; |
3c47d541 TM |
1212 | goto out_restore; |
1213 | } | |
1214 | ||
1215 | lock_buffer(data_bh); | |
1216 | error = ext4_journal_get_create_access(handle, data_bh); | |
1217 | if (error) { | |
1218 | unlock_buffer(data_bh); | |
1219 | error = -EIO; | |
1220 | goto out_restore; | |
1221 | } | |
1222 | memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); | |
1223 | ||
1224 | if (!S_ISDIR(inode->i_mode)) { | |
1225 | memcpy(data_bh->b_data, buf, inline_size); | |
1226 | set_buffer_uptodate(data_bh); | |
1227 | error = ext4_handle_dirty_metadata(handle, | |
1228 | inode, data_bh); | |
1229 | } else { | |
1230 | error = ext4_finish_convert_inline_dir(handle, inode, data_bh, | |
1231 | buf, inline_size); | |
1232 | } | |
1233 | ||
1234 | unlock_buffer(data_bh); | |
1235 | out_restore: | |
1236 | if (error) | |
1237 | ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); | |
1238 | ||
1239 | out: | |
1240 | brelse(data_bh); | |
1241 | kfree(buf); | |
1242 | return error; | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * Try to add the new entry to the inline data. | |
1247 | * If succeeds, return 0. If not, extended the inline dir and copied data to | |
1248 | * the new created block. | |
1249 | */ | |
5b643f9c | 1250 | int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 1251 | struct inode *dir, struct inode *inode) |
3c47d541 | 1252 | { |
c755e251 | 1253 | int ret, inline_size, no_expand; |
3c47d541 TM |
1254 | void *inline_start; |
1255 | struct ext4_iloc iloc; | |
3c47d541 TM |
1256 | |
1257 | ret = ext4_get_inode_loc(dir, &iloc); | |
1258 | if (ret) | |
1259 | return ret; | |
1260 | ||
c755e251 | 1261 | ext4_write_lock_xattr(dir, &no_expand); |
3c47d541 TM |
1262 | if (!ext4_has_inline_data(dir)) |
1263 | goto out; | |
1264 | ||
1265 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1266 | EXT4_INLINE_DOTDOT_SIZE; | |
1267 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
1268 | ||
56a04915 | 1269 | ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc, |
3c47d541 TM |
1270 | inline_start, inline_size); |
1271 | if (ret != -ENOSPC) | |
1272 | goto out; | |
1273 | ||
1274 | /* check whether it can be inserted to inline xattr space. */ | |
1275 | inline_size = EXT4_I(dir)->i_inline_size - | |
1276 | EXT4_MIN_INLINE_DATA_SIZE; | |
1277 | if (!inline_size) { | |
1278 | /* Try to use the xattr space.*/ | |
1279 | ret = ext4_update_inline_dir(handle, dir, &iloc); | |
1280 | if (ret && ret != -ENOSPC) | |
1281 | goto out; | |
1282 | ||
1283 | inline_size = EXT4_I(dir)->i_inline_size - | |
1284 | EXT4_MIN_INLINE_DATA_SIZE; | |
1285 | } | |
1286 | ||
1287 | if (inline_size) { | |
1288 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1289 | ||
56a04915 | 1290 | ret = ext4_add_dirent_to_inline(handle, fname, dir, |
5b643f9c TT |
1291 | inode, &iloc, inline_start, |
1292 | inline_size); | |
3c47d541 TM |
1293 | |
1294 | if (ret != -ENOSPC) | |
1295 | goto out; | |
1296 | } | |
1297 | ||
1298 | /* | |
1299 | * The inline space is filled up, so create a new block for it. | |
1300 | * As the extent tree will be created, we have to save the inline | |
1301 | * dir first. | |
1302 | */ | |
1303 | ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); | |
1304 | ||
1305 | out: | |
c755e251 | 1306 | ext4_write_unlock_xattr(dir, &no_expand); |
b907f2d5 | 1307 | ext4_mark_inode_dirty(handle, dir); |
3c47d541 TM |
1308 | brelse(iloc.bh); |
1309 | return ret; | |
1310 | } | |
1311 | ||
8af0f082 TM |
1312 | /* |
1313 | * This function fills a red-black tree with information from an | |
1314 | * inlined dir. It returns the number directory entries loaded | |
1315 | * into the tree. If there is an error it is returned in err. | |
1316 | */ | |
1317 | int htree_inlinedir_to_tree(struct file *dir_file, | |
1318 | struct inode *dir, ext4_lblk_t block, | |
1319 | struct dx_hash_info *hinfo, | |
1320 | __u32 start_hash, __u32 start_minor_hash, | |
1321 | int *has_inline_data) | |
1322 | { | |
1323 | int err = 0, count = 0; | |
1324 | unsigned int parent_ino; | |
1325 | int pos; | |
1326 | struct ext4_dir_entry_2 *de; | |
1327 | struct inode *inode = file_inode(dir_file); | |
1328 | int ret, inline_size = 0; | |
1329 | struct ext4_iloc iloc; | |
1330 | void *dir_buf = NULL; | |
1331 | struct ext4_dir_entry_2 fake; | |
a7550b30 | 1332 | struct fscrypt_str tmp_str; |
8af0f082 TM |
1333 | |
1334 | ret = ext4_get_inode_loc(inode, &iloc); | |
1335 | if (ret) | |
1336 | return ret; | |
1337 | ||
1338 | down_read(&EXT4_I(inode)->xattr_sem); | |
1339 | if (!ext4_has_inline_data(inode)) { | |
1340 | up_read(&EXT4_I(inode)->xattr_sem); | |
1341 | *has_inline_data = 0; | |
1342 | goto out; | |
1343 | } | |
1344 | ||
1345 | inline_size = ext4_get_inline_size(inode); | |
1346 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1347 | if (!dir_buf) { | |
1348 | ret = -ENOMEM; | |
1349 | up_read(&EXT4_I(inode)->xattr_sem); | |
1350 | goto out; | |
1351 | } | |
1352 | ||
1353 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1354 | up_read(&EXT4_I(inode)->xattr_sem); | |
1355 | if (ret < 0) | |
1356 | goto out; | |
1357 | ||
1358 | pos = 0; | |
1359 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); | |
1360 | while (pos < inline_size) { | |
1361 | /* | |
1362 | * As inlined dir doesn't store any information about '.' and | |
1363 | * only the inode number of '..' is stored, we have to handle | |
1364 | * them differently. | |
1365 | */ | |
1366 | if (pos == 0) { | |
1367 | fake.inode = cpu_to_le32(inode->i_ino); | |
1368 | fake.name_len = 1; | |
1369 | strcpy(fake.name, "."); | |
1370 | fake.rec_len = ext4_rec_len_to_disk( | |
1371 | EXT4_DIR_REC_LEN(fake.name_len), | |
1372 | inline_size); | |
1373 | ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); | |
1374 | de = &fake; | |
1375 | pos = EXT4_INLINE_DOTDOT_OFFSET; | |
1376 | } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { | |
1377 | fake.inode = cpu_to_le32(parent_ino); | |
1378 | fake.name_len = 2; | |
1379 | strcpy(fake.name, ".."); | |
1380 | fake.rec_len = ext4_rec_len_to_disk( | |
1381 | EXT4_DIR_REC_LEN(fake.name_len), | |
1382 | inline_size); | |
1383 | ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); | |
1384 | de = &fake; | |
1385 | pos = EXT4_INLINE_DOTDOT_SIZE; | |
1386 | } else { | |
1387 | de = (struct ext4_dir_entry_2 *)(dir_buf + pos); | |
1388 | pos += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1389 | if (ext4_check_dir_entry(inode, dir_file, de, | |
1390 | iloc.bh, dir_buf, | |
1391 | inline_size, pos)) { | |
1392 | ret = count; | |
1393 | goto out; | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | ext4fs_dirhash(de->name, de->name_len, hinfo); | |
1398 | if ((hinfo->hash < start_hash) || | |
1399 | ((hinfo->hash == start_hash) && | |
1400 | (hinfo->minor_hash < start_minor_hash))) | |
1401 | continue; | |
1402 | if (de->inode == 0) | |
1403 | continue; | |
2f61830a TT |
1404 | tmp_str.name = de->name; |
1405 | tmp_str.len = de->name_len; | |
1406 | err = ext4_htree_store_dirent(dir_file, hinfo->hash, | |
1407 | hinfo->minor_hash, de, &tmp_str); | |
8af0f082 TM |
1408 | if (err) { |
1409 | count = err; | |
1410 | goto out; | |
1411 | } | |
1412 | count++; | |
1413 | } | |
1414 | ret = count; | |
1415 | out: | |
1416 | kfree(dir_buf); | |
1417 | brelse(iloc.bh); | |
1418 | return ret; | |
1419 | } | |
1420 | ||
c4d8b023 TM |
1421 | /* |
1422 | * So this function is called when the volume is mkfsed with | |
1423 | * dir_index disabled. In order to keep f_pos persistent | |
1424 | * after we convert from an inlined dir to a blocked based, | |
1425 | * we just pretend that we are a normal dir and return the | |
1426 | * offset as if '.' and '..' really take place. | |
1427 | * | |
1428 | */ | |
725bebb2 AV |
1429 | int ext4_read_inline_dir(struct file *file, |
1430 | struct dir_context *ctx, | |
65d165d9 TM |
1431 | int *has_inline_data) |
1432 | { | |
65d165d9 | 1433 | unsigned int offset, parent_ino; |
725bebb2 | 1434 | int i; |
65d165d9 TM |
1435 | struct ext4_dir_entry_2 *de; |
1436 | struct super_block *sb; | |
725bebb2 | 1437 | struct inode *inode = file_inode(file); |
65d165d9 TM |
1438 | int ret, inline_size = 0; |
1439 | struct ext4_iloc iloc; | |
1440 | void *dir_buf = NULL; | |
c4d8b023 | 1441 | int dotdot_offset, dotdot_size, extra_offset, extra_size; |
65d165d9 TM |
1442 | |
1443 | ret = ext4_get_inode_loc(inode, &iloc); | |
1444 | if (ret) | |
1445 | return ret; | |
1446 | ||
1447 | down_read(&EXT4_I(inode)->xattr_sem); | |
1448 | if (!ext4_has_inline_data(inode)) { | |
1449 | up_read(&EXT4_I(inode)->xattr_sem); | |
1450 | *has_inline_data = 0; | |
1451 | goto out; | |
1452 | } | |
1453 | ||
1454 | inline_size = ext4_get_inline_size(inode); | |
1455 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1456 | if (!dir_buf) { | |
1457 | ret = -ENOMEM; | |
1458 | up_read(&EXT4_I(inode)->xattr_sem); | |
1459 | goto out; | |
1460 | } | |
1461 | ||
1462 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1463 | up_read(&EXT4_I(inode)->xattr_sem); | |
1464 | if (ret < 0) | |
1465 | goto out; | |
1466 | ||
48ffdab1 | 1467 | ret = 0; |
65d165d9 | 1468 | sb = inode->i_sb; |
65d165d9 | 1469 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
725bebb2 | 1470 | offset = ctx->pos; |
c4d8b023 TM |
1471 | |
1472 | /* | |
1473 | * dotdot_offset and dotdot_size is the real offset and | |
1474 | * size for ".." and "." if the dir is block based while | |
1475 | * the real size for them are only EXT4_INLINE_DOTDOT_SIZE. | |
1476 | * So we will use extra_offset and extra_size to indicate them | |
1477 | * during the inline dir iteration. | |
1478 | */ | |
1479 | dotdot_offset = EXT4_DIR_REC_LEN(1); | |
1480 | dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2); | |
1481 | extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; | |
1482 | extra_size = extra_offset + inline_size; | |
65d165d9 | 1483 | |
725bebb2 AV |
1484 | /* |
1485 | * If the version has changed since the last call to | |
1486 | * readdir(2), then we might be pointing to an invalid | |
1487 | * dirent right now. Scan from the start of the inline | |
1488 | * dir to make sure. | |
1489 | */ | |
c472c07b | 1490 | if (!inode_eq_iversion(inode, file->f_version)) { |
725bebb2 AV |
1491 | for (i = 0; i < extra_size && i < offset;) { |
1492 | /* | |
1493 | * "." is with offset 0 and | |
1494 | * ".." is dotdot_offset. | |
1495 | */ | |
1496 | if (!i) { | |
1497 | i = dotdot_offset; | |
1498 | continue; | |
1499 | } else if (i == dotdot_offset) { | |
1500 | i = dotdot_size; | |
c4d8b023 TM |
1501 | continue; |
1502 | } | |
725bebb2 AV |
1503 | /* for other entry, the real offset in |
1504 | * the buf has to be tuned accordingly. | |
1505 | */ | |
1506 | de = (struct ext4_dir_entry_2 *) | |
1507 | (dir_buf + i - extra_offset); | |
1508 | /* It's too expensive to do a full | |
1509 | * dirent test each time round this | |
1510 | * loop, but we do have to test at | |
1511 | * least that it is non-zero. A | |
1512 | * failure will be detected in the | |
1513 | * dirent test below. */ | |
1514 | if (ext4_rec_len_from_disk(de->rec_len, extra_size) | |
1515 | < EXT4_DIR_REC_LEN(1)) | |
1516 | break; | |
1517 | i += ext4_rec_len_from_disk(de->rec_len, | |
1518 | extra_size); | |
1519 | } | |
1520 | offset = i; | |
1521 | ctx->pos = offset; | |
ee73f9a5 | 1522 | file->f_version = inode_query_iversion(inode); |
725bebb2 | 1523 | } |
65d165d9 | 1524 | |
725bebb2 AV |
1525 | while (ctx->pos < extra_size) { |
1526 | if (ctx->pos == 0) { | |
1527 | if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR)) | |
1528 | goto out; | |
1529 | ctx->pos = dotdot_offset; | |
1530 | continue; | |
1531 | } | |
65d165d9 | 1532 | |
725bebb2 AV |
1533 | if (ctx->pos == dotdot_offset) { |
1534 | if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR)) | |
1535 | goto out; | |
1536 | ctx->pos = dotdot_size; | |
1537 | continue; | |
1538 | } | |
65d165d9 | 1539 | |
725bebb2 AV |
1540 | de = (struct ext4_dir_entry_2 *) |
1541 | (dir_buf + ctx->pos - extra_offset); | |
1542 | if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf, | |
1543 | extra_size, ctx->pos)) | |
1544 | goto out; | |
1545 | if (le32_to_cpu(de->inode)) { | |
1546 | if (!dir_emit(ctx, de->name, de->name_len, | |
1547 | le32_to_cpu(de->inode), | |
1548 | get_dtype(sb, de->file_type))) | |
65d165d9 | 1549 | goto out; |
65d165d9 | 1550 | } |
725bebb2 | 1551 | ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size); |
65d165d9 TM |
1552 | } |
1553 | out: | |
1554 | kfree(dir_buf); | |
1555 | brelse(iloc.bh); | |
1556 | return ret; | |
1557 | } | |
1558 | ||
32f7f22c TM |
1559 | struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
1560 | struct ext4_dir_entry_2 **parent_de, | |
1561 | int *retval) | |
1562 | { | |
1563 | struct ext4_iloc iloc; | |
1564 | ||
1565 | *retval = ext4_get_inode_loc(inode, &iloc); | |
1566 | if (*retval) | |
1567 | return NULL; | |
1568 | ||
1569 | *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1570 | ||
1571 | return iloc.bh; | |
1572 | } | |
1573 | ||
3c47d541 TM |
1574 | /* |
1575 | * Try to create the inline data for the new dir. | |
1576 | * If it succeeds, return 0, otherwise return the error. | |
1577 | * In case of ENOSPC, the caller should create the normal disk layout dir. | |
1578 | */ | |
1579 | int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, | |
1580 | struct inode *inode) | |
1581 | { | |
1582 | int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1583 | struct ext4_iloc iloc; | |
1584 | struct ext4_dir_entry_2 *de; | |
1585 | ||
1586 | ret = ext4_get_inode_loc(inode, &iloc); | |
1587 | if (ret) | |
1588 | return ret; | |
1589 | ||
1590 | ret = ext4_prepare_inline_data(handle, inode, inline_size); | |
1591 | if (ret) | |
1592 | goto out; | |
1593 | ||
1594 | /* | |
1595 | * For inline dir, we only save the inode information for the ".." | |
1596 | * and create a fake dentry to cover the left space. | |
1597 | */ | |
1598 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1599 | de->inode = cpu_to_le32(parent->i_ino); | |
1600 | de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); | |
1601 | de->inode = 0; | |
1602 | de->rec_len = ext4_rec_len_to_disk( | |
1603 | inline_size - EXT4_INLINE_DOTDOT_SIZE, | |
1604 | inline_size); | |
1605 | set_nlink(inode, 2); | |
1606 | inode->i_size = EXT4_I(inode)->i_disksize = inline_size; | |
1607 | out: | |
1608 | brelse(iloc.bh); | |
1609 | return ret; | |
1610 | } | |
1611 | ||
e8e948e7 | 1612 | struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
5b643f9c | 1613 | struct ext4_filename *fname, |
e8e948e7 TM |
1614 | struct ext4_dir_entry_2 **res_dir, |
1615 | int *has_inline_data) | |
1616 | { | |
1617 | int ret; | |
1618 | struct ext4_iloc iloc; | |
1619 | void *inline_start; | |
1620 | int inline_size; | |
1621 | ||
1622 | if (ext4_get_inode_loc(dir, &iloc)) | |
1623 | return NULL; | |
1624 | ||
1625 | down_read(&EXT4_I(dir)->xattr_sem); | |
1626 | if (!ext4_has_inline_data(dir)) { | |
1627 | *has_inline_data = 0; | |
1628 | goto out; | |
1629 | } | |
1630 | ||
1631 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1632 | EXT4_INLINE_DOTDOT_SIZE; | |
1633 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
5b643f9c | 1634 | ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
d6b97550 | 1635 | dir, fname, 0, res_dir); |
e8e948e7 TM |
1636 | if (ret == 1) |
1637 | goto out_find; | |
1638 | if (ret < 0) | |
1639 | goto out; | |
1640 | ||
1641 | if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE) | |
1642 | goto out; | |
1643 | ||
1644 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1645 | inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE; | |
1646 | ||
5b643f9c | 1647 | ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
d6b97550 | 1648 | dir, fname, 0, res_dir); |
e8e948e7 TM |
1649 | if (ret == 1) |
1650 | goto out_find; | |
1651 | ||
1652 | out: | |
1653 | brelse(iloc.bh); | |
1654 | iloc.bh = NULL; | |
1655 | out_find: | |
1656 | up_read(&EXT4_I(dir)->xattr_sem); | |
1657 | return iloc.bh; | |
1658 | } | |
1659 | ||
9f40fe54 TM |
1660 | int ext4_delete_inline_entry(handle_t *handle, |
1661 | struct inode *dir, | |
1662 | struct ext4_dir_entry_2 *de_del, | |
1663 | struct buffer_head *bh, | |
1664 | int *has_inline_data) | |
1665 | { | |
c755e251 | 1666 | int err, inline_size, no_expand; |
9f40fe54 TM |
1667 | struct ext4_iloc iloc; |
1668 | void *inline_start; | |
1669 | ||
1670 | err = ext4_get_inode_loc(dir, &iloc); | |
1671 | if (err) | |
1672 | return err; | |
1673 | ||
c755e251 | 1674 | ext4_write_lock_xattr(dir, &no_expand); |
9f40fe54 TM |
1675 | if (!ext4_has_inline_data(dir)) { |
1676 | *has_inline_data = 0; | |
1677 | goto out; | |
1678 | } | |
1679 | ||
1680 | if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) < | |
1681 | EXT4_MIN_INLINE_DATA_SIZE) { | |
1682 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1683 | EXT4_INLINE_DOTDOT_SIZE; | |
1684 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - | |
1685 | EXT4_INLINE_DOTDOT_SIZE; | |
1686 | } else { | |
1687 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1688 | inline_size = ext4_get_inline_size(dir) - | |
1689 | EXT4_MIN_INLINE_DATA_SIZE; | |
1690 | } | |
1691 | ||
5d601255 | 1692 | BUFFER_TRACE(bh, "get_write_access"); |
9f40fe54 TM |
1693 | err = ext4_journal_get_write_access(handle, bh); |
1694 | if (err) | |
1695 | goto out; | |
1696 | ||
1697 | err = ext4_generic_delete_entry(handle, dir, de_del, bh, | |
1698 | inline_start, inline_size, 0); | |
1699 | if (err) | |
1700 | goto out; | |
1701 | ||
9f40fe54 TM |
1702 | ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); |
1703 | out: | |
c755e251 | 1704 | ext4_write_unlock_xattr(dir, &no_expand); |
b907f2d5 TT |
1705 | if (likely(err == 0)) |
1706 | err = ext4_mark_inode_dirty(handle, dir); | |
9f40fe54 TM |
1707 | brelse(iloc.bh); |
1708 | if (err != -ENOENT) | |
1709 | ext4_std_error(dir->i_sb, err); | |
1710 | return err; | |
1711 | } | |
1712 | ||
61f86638 TM |
1713 | /* |
1714 | * Get the inline dentry at offset. | |
1715 | */ | |
1716 | static inline struct ext4_dir_entry_2 * | |
1717 | ext4_get_inline_entry(struct inode *inode, | |
1718 | struct ext4_iloc *iloc, | |
1719 | unsigned int offset, | |
1720 | void **inline_start, | |
1721 | int *inline_size) | |
1722 | { | |
1723 | void *inline_pos; | |
1724 | ||
1725 | BUG_ON(offset > ext4_get_inline_size(inode)); | |
1726 | ||
1727 | if (offset < EXT4_MIN_INLINE_DATA_SIZE) { | |
1728 | inline_pos = (void *)ext4_raw_inode(iloc)->i_block; | |
1729 | *inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1730 | } else { | |
1731 | inline_pos = ext4_get_inline_xattr_pos(inode, iloc); | |
1732 | offset -= EXT4_MIN_INLINE_DATA_SIZE; | |
1733 | *inline_size = ext4_get_inline_size(inode) - | |
1734 | EXT4_MIN_INLINE_DATA_SIZE; | |
1735 | } | |
1736 | ||
1737 | if (inline_start) | |
1738 | *inline_start = inline_pos; | |
1739 | return (struct ext4_dir_entry_2 *)(inline_pos + offset); | |
1740 | } | |
1741 | ||
a7550b30 | 1742 | bool empty_inline_dir(struct inode *dir, int *has_inline_data) |
61f86638 TM |
1743 | { |
1744 | int err, inline_size; | |
1745 | struct ext4_iloc iloc; | |
1746 | void *inline_pos; | |
1747 | unsigned int offset; | |
1748 | struct ext4_dir_entry_2 *de; | |
a7550b30 | 1749 | bool ret = true; |
61f86638 TM |
1750 | |
1751 | err = ext4_get_inode_loc(dir, &iloc); | |
1752 | if (err) { | |
1753 | EXT4_ERROR_INODE(dir, "error %d getting inode %lu block", | |
1754 | err, dir->i_ino); | |
a7550b30 | 1755 | return true; |
61f86638 TM |
1756 | } |
1757 | ||
1758 | down_read(&EXT4_I(dir)->xattr_sem); | |
1759 | if (!ext4_has_inline_data(dir)) { | |
1760 | *has_inline_data = 0; | |
1761 | goto out; | |
1762 | } | |
1763 | ||
1764 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1765 | if (!le32_to_cpu(de->inode)) { | |
1766 | ext4_warning(dir->i_sb, | |
1767 | "bad inline directory (dir #%lu) - no `..'", | |
1768 | dir->i_ino); | |
a7550b30 | 1769 | ret = true; |
61f86638 TM |
1770 | goto out; |
1771 | } | |
1772 | ||
1773 | offset = EXT4_INLINE_DOTDOT_SIZE; | |
1774 | while (offset < dir->i_size) { | |
1775 | de = ext4_get_inline_entry(dir, &iloc, offset, | |
1776 | &inline_pos, &inline_size); | |
1777 | if (ext4_check_dir_entry(dir, NULL, de, | |
1778 | iloc.bh, inline_pos, | |
1779 | inline_size, offset)) { | |
1780 | ext4_warning(dir->i_sb, | |
1781 | "bad inline directory (dir #%lu) - " | |
1782 | "inode %u, rec_len %u, name_len %d" | |
8d2ae1cb | 1783 | "inline size %d", |
61f86638 TM |
1784 | dir->i_ino, le32_to_cpu(de->inode), |
1785 | le16_to_cpu(de->rec_len), de->name_len, | |
1786 | inline_size); | |
a7550b30 | 1787 | ret = true; |
61f86638 TM |
1788 | goto out; |
1789 | } | |
1790 | if (le32_to_cpu(de->inode)) { | |
a7550b30 | 1791 | ret = false; |
61f86638 TM |
1792 | goto out; |
1793 | } | |
1794 | offset += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1795 | } | |
1796 | ||
1797 | out: | |
1798 | up_read(&EXT4_I(dir)->xattr_sem); | |
1799 | brelse(iloc.bh); | |
1800 | return ret; | |
1801 | } | |
1802 | ||
67cf5b09 TM |
1803 | int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
1804 | { | |
c755e251 | 1805 | int ret, no_expand; |
67cf5b09 | 1806 | |
c755e251 | 1807 | ext4_write_lock_xattr(inode, &no_expand); |
67cf5b09 | 1808 | ret = ext4_destroy_inline_data_nolock(handle, inode); |
c755e251 | 1809 | ext4_write_unlock_xattr(inode, &no_expand); |
67cf5b09 TM |
1810 | |
1811 | return ret; | |
1812 | } | |
94191985 | 1813 | |
7046ae35 AG |
1814 | int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap) |
1815 | { | |
1816 | __u64 addr; | |
1817 | int error = -EAGAIN; | |
1818 | struct ext4_iloc iloc; | |
1819 | ||
1820 | down_read(&EXT4_I(inode)->xattr_sem); | |
1821 | if (!ext4_has_inline_data(inode)) | |
1822 | goto out; | |
1823 | ||
1824 | error = ext4_get_inode_loc(inode, &iloc); | |
1825 | if (error) | |
1826 | goto out; | |
1827 | ||
1828 | addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; | |
1829 | addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; | |
1830 | addr += offsetof(struct ext4_inode, i_block); | |
1831 | ||
1832 | brelse(iloc.bh); | |
1833 | ||
1834 | iomap->addr = addr; | |
1835 | iomap->offset = 0; | |
1836 | iomap->length = min_t(loff_t, ext4_get_inline_size(inode), | |
1837 | i_size_read(inode)); | |
1838 | iomap->type = 0; | |
1839 | iomap->flags = IOMAP_F_DATA_INLINE; | |
1840 | ||
1841 | out: | |
1842 | up_read(&EXT4_I(inode)->xattr_sem); | |
1843 | return error; | |
1844 | } | |
1845 | ||
94191985 TM |
1846 | int ext4_inline_data_fiemap(struct inode *inode, |
1847 | struct fiemap_extent_info *fieinfo, | |
d952d69e | 1848 | int *has_inline, __u64 start, __u64 len) |
94191985 TM |
1849 | { |
1850 | __u64 physical = 0; | |
d952d69e DM |
1851 | __u64 inline_len; |
1852 | __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED | | |
1853 | FIEMAP_EXTENT_LAST; | |
94191985 TM |
1854 | int error = 0; |
1855 | struct ext4_iloc iloc; | |
1856 | ||
1857 | down_read(&EXT4_I(inode)->xattr_sem); | |
1858 | if (!ext4_has_inline_data(inode)) { | |
1859 | *has_inline = 0; | |
1860 | goto out; | |
1861 | } | |
d952d69e DM |
1862 | inline_len = min_t(size_t, ext4_get_inline_size(inode), |
1863 | i_size_read(inode)); | |
1864 | if (start >= inline_len) | |
1865 | goto out; | |
1866 | if (start + len < inline_len) | |
1867 | inline_len = start + len; | |
1868 | inline_len -= start; | |
94191985 TM |
1869 | |
1870 | error = ext4_get_inode_loc(inode, &iloc); | |
1871 | if (error) | |
1872 | goto out; | |
1873 | ||
eaf37937 | 1874 | physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
94191985 TM |
1875 | physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; |
1876 | physical += offsetof(struct ext4_inode, i_block); | |
94191985 TM |
1877 | |
1878 | if (physical) | |
d952d69e DM |
1879 | error = fiemap_fill_next_extent(fieinfo, start, physical, |
1880 | inline_len, flags); | |
94191985 TM |
1881 | brelse(iloc.bh); |
1882 | out: | |
1883 | up_read(&EXT4_I(inode)->xattr_sem); | |
1884 | return (error < 0 ? error : 0); | |
1885 | } | |
0d812f77 TM |
1886 | |
1887 | /* | |
1888 | * Called during xattr set, and if we can sparse space 'needed', | |
1889 | * just create the extent tree evict the data to the outer block. | |
1890 | * | |
1891 | * We use jbd2 instead of page cache to move data to the 1st block | |
1892 | * so that the whole transaction can be committed as a whole and | |
1893 | * the data isn't lost because of the delayed page cache write. | |
1894 | */ | |
1895 | int ext4_try_to_evict_inline_data(handle_t *handle, | |
1896 | struct inode *inode, | |
1897 | int needed) | |
1898 | { | |
1899 | int error; | |
1900 | struct ext4_xattr_entry *entry; | |
0d812f77 TM |
1901 | struct ext4_inode *raw_inode; |
1902 | struct ext4_iloc iloc; | |
1903 | ||
1904 | error = ext4_get_inode_loc(inode, &iloc); | |
1905 | if (error) | |
1906 | return error; | |
1907 | ||
1908 | raw_inode = ext4_raw_inode(&iloc); | |
0d812f77 TM |
1909 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
1910 | EXT4_I(inode)->i_inline_off); | |
1911 | if (EXT4_XATTR_LEN(entry->e_name_len) + | |
1912 | EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) { | |
1913 | error = -ENOSPC; | |
1914 | goto out; | |
1915 | } | |
1916 | ||
1917 | error = ext4_convert_inline_data_nolock(handle, inode, &iloc); | |
1918 | out: | |
1919 | brelse(iloc.bh); | |
1920 | return error; | |
1921 | } | |
aef1c851 | 1922 | |
01daf945 | 1923 | int ext4_inline_data_truncate(struct inode *inode, int *has_inline) |
aef1c851 TM |
1924 | { |
1925 | handle_t *handle; | |
01daf945 | 1926 | int inline_size, value_len, needed_blocks, no_expand, err = 0; |
aef1c851 TM |
1927 | size_t i_size; |
1928 | void *value = NULL; | |
1929 | struct ext4_xattr_ibody_find is = { | |
1930 | .s = { .not_found = -ENODATA, }, | |
1931 | }; | |
1932 | struct ext4_xattr_info i = { | |
1933 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
1934 | .name = EXT4_XATTR_SYSTEM_DATA, | |
1935 | }; | |
1936 | ||
1937 | ||
1938 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
9924a92a | 1939 | handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
aef1c851 | 1940 | if (IS_ERR(handle)) |
01daf945 | 1941 | return PTR_ERR(handle); |
aef1c851 | 1942 | |
c755e251 | 1943 | ext4_write_lock_xattr(inode, &no_expand); |
aef1c851 TM |
1944 | if (!ext4_has_inline_data(inode)) { |
1945 | *has_inline = 0; | |
1946 | ext4_journal_stop(handle); | |
01daf945 | 1947 | return 0; |
aef1c851 TM |
1948 | } |
1949 | ||
01daf945 | 1950 | if ((err = ext4_orphan_add(handle, inode)) != 0) |
aef1c851 TM |
1951 | goto out; |
1952 | ||
01daf945 | 1953 | if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0) |
aef1c851 TM |
1954 | goto out; |
1955 | ||
1956 | down_write(&EXT4_I(inode)->i_data_sem); | |
1957 | i_size = inode->i_size; | |
1958 | inline_size = ext4_get_inline_size(inode); | |
1959 | EXT4_I(inode)->i_disksize = i_size; | |
1960 | ||
1961 | if (i_size < inline_size) { | |
1962 | /* Clear the content in the xattr space. */ | |
1963 | if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { | |
01daf945 | 1964 | if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0) |
aef1c851 TM |
1965 | goto out_error; |
1966 | ||
1967 | BUG_ON(is.s.not_found); | |
1968 | ||
1969 | value_len = le32_to_cpu(is.s.here->e_value_size); | |
1970 | value = kmalloc(value_len, GFP_NOFS); | |
01daf945 TT |
1971 | if (!value) { |
1972 | err = -ENOMEM; | |
aef1c851 | 1973 | goto out_error; |
01daf945 | 1974 | } |
aef1c851 | 1975 | |
01daf945 TT |
1976 | err = ext4_xattr_ibody_get(inode, i.name_index, |
1977 | i.name, value, value_len); | |
1978 | if (err <= 0) | |
aef1c851 TM |
1979 | goto out_error; |
1980 | ||
1981 | i.value = value; | |
1982 | i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? | |
1983 | i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; | |
01daf945 TT |
1984 | err = ext4_xattr_ibody_inline_set(handle, inode, |
1985 | &i, &is); | |
1986 | if (err) | |
aef1c851 TM |
1987 | goto out_error; |
1988 | } | |
1989 | ||
1990 | /* Clear the content within i_blocks. */ | |
09c455aa TT |
1991 | if (i_size < EXT4_MIN_INLINE_DATA_SIZE) { |
1992 | void *p = (void *) ext4_raw_inode(&is.iloc)->i_block; | |
1993 | memset(p + i_size, 0, | |
1994 | EXT4_MIN_INLINE_DATA_SIZE - i_size); | |
1995 | } | |
aef1c851 TM |
1996 | |
1997 | EXT4_I(inode)->i_inline_size = i_size < | |
1998 | EXT4_MIN_INLINE_DATA_SIZE ? | |
1999 | EXT4_MIN_INLINE_DATA_SIZE : i_size; | |
2000 | } | |
2001 | ||
2002 | out_error: | |
2003 | up_write(&EXT4_I(inode)->i_data_sem); | |
2004 | out: | |
2005 | brelse(is.iloc.bh); | |
c755e251 | 2006 | ext4_write_unlock_xattr(inode, &no_expand); |
aef1c851 TM |
2007 | kfree(value); |
2008 | if (inode->i_nlink) | |
2009 | ext4_orphan_del(handle, inode); | |
2010 | ||
01daf945 TT |
2011 | if (err == 0) { |
2012 | inode->i_mtime = inode->i_ctime = current_time(inode); | |
2013 | err = ext4_mark_inode_dirty(handle, inode); | |
2014 | if (IS_SYNC(inode)) | |
2015 | ext4_handle_sync(handle); | |
2016 | } | |
aef1c851 | 2017 | ext4_journal_stop(handle); |
01daf945 | 2018 | return err; |
aef1c851 | 2019 | } |
0c8d414f TM |
2020 | |
2021 | int ext4_convert_inline_data(struct inode *inode) | |
2022 | { | |
c755e251 | 2023 | int error, needed_blocks, no_expand; |
0c8d414f TM |
2024 | handle_t *handle; |
2025 | struct ext4_iloc iloc; | |
2026 | ||
2027 | if (!ext4_has_inline_data(inode)) { | |
2028 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
2029 | return 0; | |
2030 | } | |
2031 | ||
2032 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
2033 | ||
2034 | iloc.bh = NULL; | |
2035 | error = ext4_get_inode_loc(inode, &iloc); | |
2036 | if (error) | |
2037 | return error; | |
2038 | ||
9924a92a | 2039 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
0c8d414f TM |
2040 | if (IS_ERR(handle)) { |
2041 | error = PTR_ERR(handle); | |
2042 | goto out_free; | |
2043 | } | |
2044 | ||
c755e251 TT |
2045 | ext4_write_lock_xattr(inode, &no_expand); |
2046 | if (ext4_has_inline_data(inode)) | |
2047 | error = ext4_convert_inline_data_nolock(handle, inode, &iloc); | |
2048 | ext4_write_unlock_xattr(inode, &no_expand); | |
0c8d414f TM |
2049 | ext4_journal_stop(handle); |
2050 | out_free: | |
2051 | brelse(iloc.bh); | |
2052 | return error; | |
2053 | } |