Commit | Line | Data |
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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) { | |
117166ef TT |
147 | if (is.s.here->e_value_inum) { |
148 | EXT4_ERROR_INODE(inode, "inline data xattr refers " | |
149 | "to an external xattr inode"); | |
150 | error = -EFSCORRUPTED; | |
151 | goto out; | |
152 | } | |
67cf5b09 TM |
153 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
154 | (void *)ext4_raw_inode(&is.iloc)); | |
155 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
156 | le32_to_cpu(is.s.here->e_value_size); | |
157 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
158 | } | |
159 | out: | |
160 | brelse(is.iloc.bh); | |
161 | return error; | |
162 | } | |
163 | ||
164 | static int ext4_read_inline_data(struct inode *inode, void *buffer, | |
165 | unsigned int len, | |
166 | struct ext4_iloc *iloc) | |
167 | { | |
168 | struct ext4_xattr_entry *entry; | |
169 | struct ext4_xattr_ibody_header *header; | |
170 | int cp_len = 0; | |
171 | struct ext4_inode *raw_inode; | |
172 | ||
173 | if (!len) | |
174 | return 0; | |
175 | ||
176 | BUG_ON(len > EXT4_I(inode)->i_inline_size); | |
177 | ||
178 | cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? | |
179 | len : EXT4_MIN_INLINE_DATA_SIZE; | |
180 | ||
181 | raw_inode = ext4_raw_inode(iloc); | |
182 | memcpy(buffer, (void *)(raw_inode->i_block), cp_len); | |
183 | ||
184 | len -= cp_len; | |
185 | buffer += cp_len; | |
186 | ||
187 | if (!len) | |
188 | goto out; | |
189 | ||
190 | header = IHDR(inode, raw_inode); | |
191 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
192 | EXT4_I(inode)->i_inline_off); | |
193 | len = min_t(unsigned int, len, | |
194 | (unsigned int)le32_to_cpu(entry->e_value_size)); | |
195 | ||
196 | memcpy(buffer, | |
197 | (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); | |
198 | cp_len += len; | |
199 | ||
200 | out: | |
201 | return cp_len; | |
202 | } | |
203 | ||
204 | /* | |
205 | * write the buffer to the inline inode. | |
206 | * If 'create' is set, we don't need to do the extra copy in the xattr | |
0d812f77 TM |
207 | * value since it is already handled by ext4_xattr_ibody_inline_set. |
208 | * That saves us one memcpy. | |
67cf5b09 | 209 | */ |
c197855e SH |
210 | static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, |
211 | void *buffer, loff_t pos, unsigned int len) | |
67cf5b09 TM |
212 | { |
213 | struct ext4_xattr_entry *entry; | |
214 | struct ext4_xattr_ibody_header *header; | |
215 | struct ext4_inode *raw_inode; | |
216 | int cp_len = 0; | |
217 | ||
0db1ff22 TT |
218 | if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
219 | return; | |
220 | ||
67cf5b09 TM |
221 | BUG_ON(!EXT4_I(inode)->i_inline_off); |
222 | BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); | |
223 | ||
224 | raw_inode = ext4_raw_inode(iloc); | |
225 | buffer += pos; | |
226 | ||
227 | if (pos < EXT4_MIN_INLINE_DATA_SIZE) { | |
228 | cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? | |
229 | EXT4_MIN_INLINE_DATA_SIZE - pos : len; | |
230 | memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); | |
231 | ||
232 | len -= cp_len; | |
233 | buffer += cp_len; | |
234 | pos += cp_len; | |
235 | } | |
236 | ||
237 | if (!len) | |
238 | return; | |
239 | ||
240 | pos -= EXT4_MIN_INLINE_DATA_SIZE; | |
241 | header = IHDR(inode, raw_inode); | |
242 | entry = (struct ext4_xattr_entry *)((void *)raw_inode + | |
243 | EXT4_I(inode)->i_inline_off); | |
244 | ||
245 | memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, | |
246 | buffer, len); | |
247 | } | |
248 | ||
249 | static int ext4_create_inline_data(handle_t *handle, | |
250 | struct inode *inode, unsigned len) | |
251 | { | |
252 | int error; | |
253 | void *value = NULL; | |
254 | struct ext4_xattr_ibody_find is = { | |
255 | .s = { .not_found = -ENODATA, }, | |
256 | }; | |
257 | struct ext4_xattr_info i = { | |
258 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
259 | .name = EXT4_XATTR_SYSTEM_DATA, | |
260 | }; | |
261 | ||
262 | error = ext4_get_inode_loc(inode, &is.iloc); | |
263 | if (error) | |
264 | return error; | |
265 | ||
5d601255 | 266 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
267 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
268 | if (error) | |
269 | goto out; | |
270 | ||
271 | if (len > EXT4_MIN_INLINE_DATA_SIZE) { | |
bd9926e8 | 272 | value = EXT4_ZERO_XATTR_VALUE; |
67cf5b09 TM |
273 | len -= EXT4_MIN_INLINE_DATA_SIZE; |
274 | } else { | |
275 | value = ""; | |
276 | len = 0; | |
277 | } | |
278 | ||
279 | /* Insert the the xttr entry. */ | |
280 | i.value = value; | |
281 | i.value_len = len; | |
282 | ||
283 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
284 | if (error) | |
285 | goto out; | |
286 | ||
287 | BUG_ON(!is.s.not_found); | |
288 | ||
0d812f77 | 289 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
290 | if (error) { |
291 | if (error == -ENOSPC) | |
292 | ext4_clear_inode_state(inode, | |
293 | EXT4_STATE_MAY_INLINE_DATA); | |
294 | goto out; | |
295 | } | |
296 | ||
297 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
298 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
299 | ||
300 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
301 | (void *)ext4_raw_inode(&is.iloc)); | |
302 | EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; | |
303 | ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); | |
304 | ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
305 | get_bh(is.iloc.bh); | |
306 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
307 | ||
308 | out: | |
309 | brelse(is.iloc.bh); | |
310 | return error; | |
311 | } | |
312 | ||
313 | static int ext4_update_inline_data(handle_t *handle, struct inode *inode, | |
314 | unsigned int len) | |
315 | { | |
316 | int error; | |
317 | void *value = NULL; | |
318 | struct ext4_xattr_ibody_find is = { | |
319 | .s = { .not_found = -ENODATA, }, | |
320 | }; | |
321 | struct ext4_xattr_info i = { | |
322 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
323 | .name = EXT4_XATTR_SYSTEM_DATA, | |
324 | }; | |
325 | ||
326 | /* If the old space is ok, write the data directly. */ | |
327 | if (len <= EXT4_I(inode)->i_inline_size) | |
328 | return 0; | |
329 | ||
330 | error = ext4_get_inode_loc(inode, &is.iloc); | |
331 | if (error) | |
332 | return error; | |
333 | ||
334 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
335 | if (error) | |
336 | goto out; | |
337 | ||
338 | BUG_ON(is.s.not_found); | |
339 | ||
340 | len -= EXT4_MIN_INLINE_DATA_SIZE; | |
341 | value = kzalloc(len, GFP_NOFS); | |
578620f4 DC |
342 | if (!value) { |
343 | error = -ENOMEM; | |
67cf5b09 | 344 | goto out; |
578620f4 | 345 | } |
67cf5b09 TM |
346 | |
347 | error = ext4_xattr_ibody_get(inode, i.name_index, i.name, | |
348 | value, len); | |
349 | if (error == -ENODATA) | |
350 | goto out; | |
351 | ||
5d601255 | 352 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
353 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
354 | if (error) | |
355 | goto out; | |
356 | ||
357 | /* Update the xttr entry. */ | |
358 | i.value = value; | |
359 | i.value_len = len; | |
360 | ||
0d812f77 | 361 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
362 | if (error) |
363 | goto out; | |
364 | ||
365 | EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - | |
366 | (void *)ext4_raw_inode(&is.iloc)); | |
367 | EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + | |
368 | le32_to_cpu(is.s.here->e_value_size); | |
369 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
370 | get_bh(is.iloc.bh); | |
371 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
372 | ||
373 | out: | |
374 | kfree(value); | |
375 | brelse(is.iloc.bh); | |
376 | return error; | |
377 | } | |
378 | ||
c197855e SH |
379 | static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
380 | unsigned int len) | |
67cf5b09 | 381 | { |
c755e251 | 382 | int ret, size, no_expand; |
67cf5b09 TM |
383 | struct ext4_inode_info *ei = EXT4_I(inode); |
384 | ||
385 | if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) | |
386 | return -ENOSPC; | |
387 | ||
388 | size = ext4_get_max_inline_size(inode); | |
389 | if (size < len) | |
390 | return -ENOSPC; | |
391 | ||
c755e251 | 392 | ext4_write_lock_xattr(inode, &no_expand); |
67cf5b09 TM |
393 | |
394 | if (ei->i_inline_off) | |
395 | ret = ext4_update_inline_data(handle, inode, len); | |
396 | else | |
397 | ret = ext4_create_inline_data(handle, inode, len); | |
398 | ||
c755e251 | 399 | ext4_write_unlock_xattr(inode, &no_expand); |
67cf5b09 TM |
400 | return ret; |
401 | } | |
402 | ||
403 | static int ext4_destroy_inline_data_nolock(handle_t *handle, | |
404 | struct inode *inode) | |
405 | { | |
406 | struct ext4_inode_info *ei = EXT4_I(inode); | |
407 | struct ext4_xattr_ibody_find is = { | |
408 | .s = { .not_found = 0, }, | |
409 | }; | |
410 | struct ext4_xattr_info i = { | |
411 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
412 | .name = EXT4_XATTR_SYSTEM_DATA, | |
413 | .value = NULL, | |
414 | .value_len = 0, | |
415 | }; | |
416 | int error; | |
417 | ||
418 | if (!ei->i_inline_off) | |
419 | return 0; | |
420 | ||
421 | error = ext4_get_inode_loc(inode, &is.iloc); | |
422 | if (error) | |
423 | return error; | |
424 | ||
425 | error = ext4_xattr_ibody_find(inode, &i, &is); | |
426 | if (error) | |
427 | goto out; | |
428 | ||
5d601255 | 429 | BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
67cf5b09 TM |
430 | error = ext4_journal_get_write_access(handle, is.iloc.bh); |
431 | if (error) | |
432 | goto out; | |
433 | ||
0d812f77 | 434 | error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is); |
67cf5b09 TM |
435 | if (error) |
436 | goto out; | |
437 | ||
438 | memset((void *)ext4_raw_inode(&is.iloc)->i_block, | |
439 | 0, EXT4_MIN_INLINE_DATA_SIZE); | |
6e8ab72a | 440 | memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE); |
67cf5b09 | 441 | |
e2b911c5 | 442 | if (ext4_has_feature_extents(inode->i_sb)) { |
67cf5b09 TM |
443 | if (S_ISDIR(inode->i_mode) || |
444 | S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { | |
445 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); | |
446 | ext4_ext_tree_init(handle, inode); | |
447 | } | |
448 | } | |
449 | ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); | |
450 | ||
451 | get_bh(is.iloc.bh); | |
452 | error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); | |
453 | ||
454 | EXT4_I(inode)->i_inline_off = 0; | |
455 | EXT4_I(inode)->i_inline_size = 0; | |
456 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
457 | out: | |
458 | brelse(is.iloc.bh); | |
459 | if (error == -ENODATA) | |
460 | error = 0; | |
461 | return error; | |
462 | } | |
463 | ||
46c7f254 TM |
464 | static int ext4_read_inline_page(struct inode *inode, struct page *page) |
465 | { | |
466 | void *kaddr; | |
467 | int ret = 0; | |
468 | size_t len; | |
469 | struct ext4_iloc iloc; | |
470 | ||
471 | BUG_ON(!PageLocked(page)); | |
472 | BUG_ON(!ext4_has_inline_data(inode)); | |
473 | BUG_ON(page->index); | |
474 | ||
475 | if (!EXT4_I(inode)->i_inline_off) { | |
476 | ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", | |
477 | inode->i_ino); | |
478 | goto out; | |
479 | } | |
480 | ||
481 | ret = ext4_get_inode_loc(inode, &iloc); | |
482 | if (ret) | |
483 | goto out; | |
484 | ||
485 | len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); | |
486 | kaddr = kmap_atomic(page); | |
487 | ret = ext4_read_inline_data(inode, kaddr, len, &iloc); | |
488 | flush_dcache_page(page); | |
489 | kunmap_atomic(kaddr); | |
09cbfeaf | 490 | zero_user_segment(page, len, PAGE_SIZE); |
46c7f254 TM |
491 | SetPageUptodate(page); |
492 | brelse(iloc.bh); | |
493 | ||
494 | out: | |
495 | return ret; | |
496 | } | |
497 | ||
498 | int ext4_readpage_inline(struct inode *inode, struct page *page) | |
499 | { | |
500 | int ret = 0; | |
501 | ||
502 | down_read(&EXT4_I(inode)->xattr_sem); | |
503 | if (!ext4_has_inline_data(inode)) { | |
504 | up_read(&EXT4_I(inode)->xattr_sem); | |
505 | return -EAGAIN; | |
506 | } | |
507 | ||
508 | /* | |
509 | * Current inline data can only exist in the 1st page, | |
510 | * So for all the other pages, just set them uptodate. | |
511 | */ | |
512 | if (!page->index) | |
513 | ret = ext4_read_inline_page(inode, page); | |
514 | else if (!PageUptodate(page)) { | |
09cbfeaf | 515 | zero_user_segment(page, 0, PAGE_SIZE); |
46c7f254 TM |
516 | SetPageUptodate(page); |
517 | } | |
518 | ||
519 | up_read(&EXT4_I(inode)->xattr_sem); | |
520 | ||
521 | unlock_page(page); | |
522 | return ret >= 0 ? 0 : ret; | |
523 | } | |
524 | ||
f19d5870 TM |
525 | static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
526 | struct inode *inode, | |
527 | unsigned flags) | |
528 | { | |
c755e251 | 529 | int ret, needed_blocks, no_expand; |
f19d5870 TM |
530 | handle_t *handle = NULL; |
531 | int retries = 0, sem_held = 0; | |
532 | struct page *page = NULL; | |
533 | unsigned from, to; | |
534 | struct ext4_iloc iloc; | |
535 | ||
536 | if (!ext4_has_inline_data(inode)) { | |
537 | /* | |
538 | * clear the flag so that no new write | |
539 | * will trap here again. | |
540 | */ | |
541 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
546 | ||
547 | ret = ext4_get_inode_loc(inode, &iloc); | |
548 | if (ret) | |
549 | return ret; | |
550 | ||
551 | retry: | |
9924a92a | 552 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
f19d5870 TM |
553 | if (IS_ERR(handle)) { |
554 | ret = PTR_ERR(handle); | |
555 | handle = NULL; | |
556 | goto out; | |
557 | } | |
558 | ||
559 | /* We cannot recurse into the filesystem as the transaction is already | |
560 | * started */ | |
561 | flags |= AOP_FLAG_NOFS; | |
562 | ||
563 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
564 | if (!page) { | |
565 | ret = -ENOMEM; | |
566 | goto out; | |
567 | } | |
568 | ||
c755e251 | 569 | ext4_write_lock_xattr(inode, &no_expand); |
f19d5870 TM |
570 | sem_held = 1; |
571 | /* If some one has already done this for us, just exit. */ | |
572 | if (!ext4_has_inline_data(inode)) { | |
573 | ret = 0; | |
574 | goto out; | |
575 | } | |
576 | ||
577 | from = 0; | |
578 | to = ext4_get_inline_size(inode); | |
579 | if (!PageUptodate(page)) { | |
580 | ret = ext4_read_inline_page(inode, page); | |
581 | if (ret < 0) | |
582 | goto out; | |
583 | } | |
584 | ||
585 | ret = ext4_destroy_inline_data_nolock(handle, inode); | |
586 | if (ret) | |
587 | goto out; | |
588 | ||
705965bd JK |
589 | if (ext4_should_dioread_nolock(inode)) { |
590 | ret = __block_write_begin(page, from, to, | |
591 | ext4_get_block_unwritten); | |
592 | } else | |
f19d5870 TM |
593 | ret = __block_write_begin(page, from, to, ext4_get_block); |
594 | ||
595 | if (!ret && ext4_should_journal_data(inode)) { | |
596 | ret = ext4_walk_page_buffers(handle, page_buffers(page), | |
597 | from, to, NULL, | |
598 | do_journal_get_write_access); | |
599 | } | |
600 | ||
601 | if (ret) { | |
602 | unlock_page(page); | |
09cbfeaf | 603 | put_page(page); |
684de574 | 604 | page = NULL; |
f19d5870 | 605 | ext4_orphan_add(handle, inode); |
c755e251 | 606 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 TM |
607 | sem_held = 0; |
608 | ext4_journal_stop(handle); | |
609 | handle = NULL; | |
610 | ext4_truncate_failed_write(inode); | |
611 | /* | |
612 | * If truncate failed early the inode might | |
613 | * still be on the orphan list; we need to | |
614 | * make sure the inode is removed from the | |
615 | * orphan list in that case. | |
616 | */ | |
617 | if (inode->i_nlink) | |
618 | ext4_orphan_del(NULL, inode); | |
619 | } | |
620 | ||
621 | if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) | |
622 | goto retry; | |
623 | ||
684de574 DW |
624 | if (page) |
625 | block_commit_write(page, from, to); | |
f19d5870 TM |
626 | out: |
627 | if (page) { | |
628 | unlock_page(page); | |
09cbfeaf | 629 | put_page(page); |
f19d5870 TM |
630 | } |
631 | if (sem_held) | |
c755e251 | 632 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 TM |
633 | if (handle) |
634 | ext4_journal_stop(handle); | |
635 | brelse(iloc.bh); | |
636 | return ret; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Try to write data in the inode. | |
641 | * If the inode has inline data, check whether the new write can be | |
642 | * in the inode also. If not, create the page the handle, move the data | |
643 | * to the page make it update and let the later codes create extent for it. | |
644 | */ | |
645 | int ext4_try_to_write_inline_data(struct address_space *mapping, | |
646 | struct inode *inode, | |
647 | loff_t pos, unsigned len, | |
648 | unsigned flags, | |
649 | struct page **pagep) | |
650 | { | |
651 | int ret; | |
652 | handle_t *handle; | |
653 | struct page *page; | |
654 | struct ext4_iloc iloc; | |
655 | ||
656 | if (pos + len > ext4_get_max_inline_size(inode)) | |
657 | goto convert; | |
658 | ||
659 | ret = ext4_get_inode_loc(inode, &iloc); | |
660 | if (ret) | |
661 | return ret; | |
662 | ||
663 | /* | |
664 | * The possible write could happen in the inode, | |
665 | * so try to reserve the space in inode first. | |
666 | */ | |
9924a92a | 667 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
f19d5870 TM |
668 | if (IS_ERR(handle)) { |
669 | ret = PTR_ERR(handle); | |
670 | handle = NULL; | |
671 | goto out; | |
672 | } | |
673 | ||
674 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
675 | if (ret && ret != -ENOSPC) | |
676 | goto out; | |
677 | ||
678 | /* We don't have space in inline inode, so convert it to extent. */ | |
679 | if (ret == -ENOSPC) { | |
680 | ext4_journal_stop(handle); | |
681 | brelse(iloc.bh); | |
682 | goto convert; | |
683 | } | |
684 | ||
362eca70 TT |
685 | ret = ext4_journal_get_write_access(handle, iloc.bh); |
686 | if (ret) | |
687 | goto out; | |
688 | ||
f19d5870 TM |
689 | flags |= AOP_FLAG_NOFS; |
690 | ||
691 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
692 | if (!page) { | |
693 | ret = -ENOMEM; | |
694 | goto out; | |
695 | } | |
696 | ||
697 | *pagep = page; | |
698 | down_read(&EXT4_I(inode)->xattr_sem); | |
699 | if (!ext4_has_inline_data(inode)) { | |
700 | ret = 0; | |
701 | unlock_page(page); | |
09cbfeaf | 702 | put_page(page); |
f19d5870 TM |
703 | goto out_up_read; |
704 | } | |
705 | ||
706 | if (!PageUptodate(page)) { | |
707 | ret = ext4_read_inline_page(inode, page); | |
708 | if (ret < 0) | |
709 | goto out_up_read; | |
710 | } | |
711 | ||
712 | ret = 1; | |
713 | handle = NULL; | |
714 | out_up_read: | |
715 | up_read(&EXT4_I(inode)->xattr_sem); | |
716 | out: | |
362eca70 | 717 | if (handle && (ret != 1)) |
f19d5870 TM |
718 | ext4_journal_stop(handle); |
719 | brelse(iloc.bh); | |
720 | return ret; | |
721 | convert: | |
722 | return ext4_convert_inline_data_to_extent(mapping, | |
723 | inode, flags); | |
724 | } | |
725 | ||
726 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, | |
727 | unsigned copied, struct page *page) | |
728 | { | |
c755e251 | 729 | int ret, no_expand; |
f19d5870 TM |
730 | void *kaddr; |
731 | struct ext4_iloc iloc; | |
732 | ||
733 | if (unlikely(copied < len)) { | |
734 | if (!PageUptodate(page)) { | |
735 | copied = 0; | |
736 | goto out; | |
737 | } | |
738 | } | |
739 | ||
740 | ret = ext4_get_inode_loc(inode, &iloc); | |
741 | if (ret) { | |
742 | ext4_std_error(inode->i_sb, ret); | |
743 | copied = 0; | |
744 | goto out; | |
745 | } | |
746 | ||
c755e251 | 747 | ext4_write_lock_xattr(inode, &no_expand); |
f19d5870 TM |
748 | BUG_ON(!ext4_has_inline_data(inode)); |
749 | ||
750 | kaddr = kmap_atomic(page); | |
751 | ext4_write_inline_data(inode, &iloc, kaddr, pos, len); | |
752 | kunmap_atomic(kaddr); | |
753 | SetPageUptodate(page); | |
754 | /* clear page dirty so that writepages wouldn't work for us. */ | |
755 | ClearPageDirty(page); | |
756 | ||
c755e251 | 757 | ext4_write_unlock_xattr(inode, &no_expand); |
f19d5870 | 758 | brelse(iloc.bh); |
362eca70 | 759 | mark_inode_dirty(inode); |
f19d5870 TM |
760 | out: |
761 | return copied; | |
762 | } | |
763 | ||
3fdcfb66 TM |
764 | struct buffer_head * |
765 | ext4_journalled_write_inline_data(struct inode *inode, | |
766 | unsigned len, | |
767 | struct page *page) | |
768 | { | |
c755e251 | 769 | int ret, no_expand; |
3fdcfb66 TM |
770 | void *kaddr; |
771 | struct ext4_iloc iloc; | |
772 | ||
773 | ret = ext4_get_inode_loc(inode, &iloc); | |
774 | if (ret) { | |
775 | ext4_std_error(inode->i_sb, ret); | |
776 | return NULL; | |
777 | } | |
778 | ||
c755e251 | 779 | ext4_write_lock_xattr(inode, &no_expand); |
3fdcfb66 TM |
780 | kaddr = kmap_atomic(page); |
781 | ext4_write_inline_data(inode, &iloc, kaddr, 0, len); | |
782 | kunmap_atomic(kaddr); | |
c755e251 | 783 | ext4_write_unlock_xattr(inode, &no_expand); |
3fdcfb66 TM |
784 | |
785 | return iloc.bh; | |
786 | } | |
787 | ||
9c3569b5 TM |
788 | /* |
789 | * Try to make the page cache and handle ready for the inline data case. | |
790 | * We can call this function in 2 cases: | |
791 | * 1. The inode is created and the first write exceeds inline size. We can | |
792 | * clear the inode state safely. | |
793 | * 2. The inode has inline data, then we need to read the data, make it | |
794 | * update and dirty so that ext4_da_writepages can handle it. We don't | |
795 | * need to start the journal since the file's metatdata isn't changed now. | |
796 | */ | |
797 | static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, | |
798 | struct inode *inode, | |
799 | unsigned flags, | |
800 | void **fsdata) | |
801 | { | |
802 | int ret = 0, inline_size; | |
803 | struct page *page; | |
804 | ||
805 | page = grab_cache_page_write_begin(mapping, 0, flags); | |
806 | if (!page) | |
807 | return -ENOMEM; | |
808 | ||
809 | down_read(&EXT4_I(inode)->xattr_sem); | |
810 | if (!ext4_has_inline_data(inode)) { | |
811 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
812 | goto out; | |
813 | } | |
814 | ||
815 | inline_size = ext4_get_inline_size(inode); | |
816 | ||
817 | if (!PageUptodate(page)) { | |
818 | ret = ext4_read_inline_page(inode, page); | |
819 | if (ret < 0) | |
820 | goto out; | |
821 | } | |
822 | ||
823 | ret = __block_write_begin(page, 0, inline_size, | |
824 | ext4_da_get_block_prep); | |
825 | if (ret) { | |
50db71ab DM |
826 | up_read(&EXT4_I(inode)->xattr_sem); |
827 | unlock_page(page); | |
09cbfeaf | 828 | put_page(page); |
9c3569b5 | 829 | ext4_truncate_failed_write(inode); |
50db71ab | 830 | return ret; |
9c3569b5 TM |
831 | } |
832 | ||
833 | SetPageDirty(page); | |
834 | SetPageUptodate(page); | |
835 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
836 | *fsdata = (void *)CONVERT_INLINE_DATA; | |
837 | ||
838 | out: | |
839 | up_read(&EXT4_I(inode)->xattr_sem); | |
840 | if (page) { | |
841 | unlock_page(page); | |
09cbfeaf | 842 | put_page(page); |
9c3569b5 TM |
843 | } |
844 | return ret; | |
845 | } | |
846 | ||
847 | /* | |
848 | * Prepare the write for the inline data. | |
849 | * If the the data can be written into the inode, we just read | |
850 | * the page and make it uptodate, and start the journal. | |
851 | * Otherwise read the page, makes it dirty so that it can be | |
852 | * handle in writepages(the i_disksize update is left to the | |
853 | * normal ext4_da_write_end). | |
854 | */ | |
855 | int ext4_da_write_inline_data_begin(struct address_space *mapping, | |
856 | struct inode *inode, | |
857 | loff_t pos, unsigned len, | |
858 | unsigned flags, | |
859 | struct page **pagep, | |
860 | void **fsdata) | |
861 | { | |
862 | int ret, inline_size; | |
863 | handle_t *handle; | |
864 | struct page *page; | |
865 | struct ext4_iloc iloc; | |
bc0ca9df | 866 | int retries; |
9c3569b5 TM |
867 | |
868 | ret = ext4_get_inode_loc(inode, &iloc); | |
869 | if (ret) | |
870 | return ret; | |
871 | ||
bc0ca9df | 872 | retry_journal: |
9924a92a | 873 | handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
9c3569b5 TM |
874 | if (IS_ERR(handle)) { |
875 | ret = PTR_ERR(handle); | |
9c3569b5 TM |
876 | goto out; |
877 | } | |
878 | ||
879 | inline_size = ext4_get_max_inline_size(inode); | |
880 | ||
881 | ret = -ENOSPC; | |
882 | if (inline_size >= pos + len) { | |
883 | ret = ext4_prepare_inline_data(handle, inode, pos + len); | |
884 | if (ret && ret != -ENOSPC) | |
52e44777 | 885 | goto out_journal; |
9c3569b5 TM |
886 | } |
887 | ||
5cc28a9e DM |
888 | /* |
889 | * We cannot recurse into the filesystem as the transaction | |
890 | * is already started. | |
891 | */ | |
892 | flags |= AOP_FLAG_NOFS; | |
893 | ||
9c3569b5 | 894 | if (ret == -ENOSPC) { |
8bc1379b | 895 | ext4_journal_stop(handle); |
9c3569b5 TM |
896 | ret = ext4_da_convert_inline_data_to_extent(mapping, |
897 | inode, | |
898 | flags, | |
899 | fsdata); | |
bc0ca9df JK |
900 | if (ret == -ENOSPC && |
901 | ext4_should_retry_alloc(inode->i_sb, &retries)) | |
902 | goto retry_journal; | |
9c3569b5 TM |
903 | goto out; |
904 | } | |
905 | ||
9c3569b5 TM |
906 | page = grab_cache_page_write_begin(mapping, 0, flags); |
907 | if (!page) { | |
908 | ret = -ENOMEM; | |
52e44777 | 909 | goto out_journal; |
9c3569b5 TM |
910 | } |
911 | ||
912 | down_read(&EXT4_I(inode)->xattr_sem); | |
913 | if (!ext4_has_inline_data(inode)) { | |
914 | ret = 0; | |
915 | goto out_release_page; | |
916 | } | |
917 | ||
918 | if (!PageUptodate(page)) { | |
919 | ret = ext4_read_inline_page(inode, page); | |
920 | if (ret < 0) | |
921 | goto out_release_page; | |
922 | } | |
362eca70 TT |
923 | ret = ext4_journal_get_write_access(handle, iloc.bh); |
924 | if (ret) | |
925 | goto out_release_page; | |
9c3569b5 TM |
926 | |
927 | up_read(&EXT4_I(inode)->xattr_sem); | |
928 | *pagep = page; | |
9c3569b5 TM |
929 | brelse(iloc.bh); |
930 | return 1; | |
931 | out_release_page: | |
932 | up_read(&EXT4_I(inode)->xattr_sem); | |
933 | unlock_page(page); | |
09cbfeaf | 934 | put_page(page); |
52e44777 JK |
935 | out_journal: |
936 | ext4_journal_stop(handle); | |
9c3569b5 | 937 | out: |
9c3569b5 TM |
938 | brelse(iloc.bh); |
939 | return ret; | |
940 | } | |
941 | ||
942 | int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, | |
943 | unsigned len, unsigned copied, | |
944 | struct page *page) | |
945 | { | |
eb5efbcb | 946 | int ret; |
9c3569b5 | 947 | |
eb5efbcb TT |
948 | ret = ext4_write_inline_data_end(inode, pos, len, copied, page); |
949 | if (ret < 0) { | |
950 | unlock_page(page); | |
951 | put_page(page); | |
952 | return ret; | |
953 | } | |
954 | copied = ret; | |
9c3569b5 TM |
955 | |
956 | /* | |
957 | * No need to use i_size_read() here, the i_size | |
958 | * cannot change under us because we hold i_mutex. | |
959 | * | |
960 | * But it's important to update i_size while still holding page lock: | |
961 | * page writeout could otherwise come in and zero beyond i_size. | |
962 | */ | |
362eca70 | 963 | if (pos+copied > inode->i_size) |
9c3569b5 | 964 | i_size_write(inode, pos+copied); |
9c3569b5 | 965 | unlock_page(page); |
09cbfeaf | 966 | put_page(page); |
9c3569b5 TM |
967 | |
968 | /* | |
969 | * Don't mark the inode dirty under page lock. First, it unnecessarily | |
970 | * makes the holding time of page lock longer. Second, it forces lock | |
971 | * ordering of page lock and transaction start for journaling | |
972 | * filesystems. | |
973 | */ | |
362eca70 | 974 | mark_inode_dirty(inode); |
9c3569b5 TM |
975 | |
976 | return copied; | |
977 | } | |
f19d5870 | 978 | |
3c47d541 TM |
979 | #ifdef INLINE_DIR_DEBUG |
980 | void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, | |
981 | void *inline_start, int inline_size) | |
982 | { | |
983 | int offset; | |
984 | unsigned short de_len; | |
985 | struct ext4_dir_entry_2 *de = inline_start; | |
986 | void *dlimit = inline_start + inline_size; | |
987 | ||
988 | trace_printk("inode %lu\n", dir->i_ino); | |
989 | offset = 0; | |
990 | while ((void *)de < dlimit) { | |
991 | de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); | |
80cfb71e | 992 | trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n", |
3c47d541 TM |
993 | offset, de_len, de->name_len, de->name, |
994 | de->name_len, le32_to_cpu(de->inode)); | |
995 | if (ext4_check_dir_entry(dir, NULL, de, bh, | |
996 | inline_start, inline_size, offset)) | |
997 | BUG(); | |
998 | ||
999 | offset += de_len; | |
1000 | de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); | |
1001 | } | |
1002 | } | |
1003 | #else | |
1004 | #define ext4_show_inline_dir(dir, bh, inline_start, inline_size) | |
1005 | #endif | |
1006 | ||
1007 | /* | |
1008 | * Add a new entry into a inline dir. | |
1009 | * It will return -ENOSPC if no space is available, and -EIO | |
1010 | * and -EEXIST if directory entry already exists. | |
1011 | */ | |
1012 | static int ext4_add_dirent_to_inline(handle_t *handle, | |
5b643f9c | 1013 | struct ext4_filename *fname, |
56a04915 | 1014 | struct inode *dir, |
3c47d541 TM |
1015 | struct inode *inode, |
1016 | struct ext4_iloc *iloc, | |
1017 | void *inline_start, int inline_size) | |
1018 | { | |
3c47d541 TM |
1019 | int err; |
1020 | struct ext4_dir_entry_2 *de; | |
1021 | ||
5b643f9c TT |
1022 | err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start, |
1023 | inline_size, fname, &de); | |
3c47d541 TM |
1024 | if (err) |
1025 | return err; | |
1026 | ||
5d601255 | 1027 | BUFFER_TRACE(iloc->bh, "get_write_access"); |
3c47d541 TM |
1028 | err = ext4_journal_get_write_access(handle, iloc->bh); |
1029 | if (err) | |
1030 | return err; | |
1bc0af60 | 1031 | ext4_insert_dentry(inode, de, inline_size, fname); |
3c47d541 TM |
1032 | |
1033 | ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); | |
1034 | ||
1035 | /* | |
1036 | * XXX shouldn't update any times until successful | |
1037 | * completion of syscall, but too many callers depend | |
1038 | * on this. | |
1039 | * | |
1040 | * XXX similarly, too many callers depend on | |
1041 | * ext4_new_inode() setting the times, but error | |
1042 | * recovery deletes the inode, so the worst that can | |
1043 | * happen is that the times are slightly out of date | |
1044 | * and/or different from the directory change time. | |
1045 | */ | |
eeca7ea1 | 1046 | dir->i_mtime = dir->i_ctime = current_time(dir); |
3c47d541 | 1047 | ext4_update_dx_flag(dir); |
ee73f9a5 | 1048 | inode_inc_iversion(dir); |
3c47d541 TM |
1049 | return 1; |
1050 | } | |
1051 | ||
1052 | static void *ext4_get_inline_xattr_pos(struct inode *inode, | |
1053 | struct ext4_iloc *iloc) | |
1054 | { | |
1055 | struct ext4_xattr_entry *entry; | |
1056 | struct ext4_xattr_ibody_header *header; | |
1057 | ||
1058 | BUG_ON(!EXT4_I(inode)->i_inline_off); | |
1059 | ||
1060 | header = IHDR(inode, ext4_raw_inode(iloc)); | |
1061 | entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + | |
1062 | EXT4_I(inode)->i_inline_off); | |
1063 | ||
1064 | return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); | |
1065 | } | |
1066 | ||
1067 | /* Set the final de to cover the whole block. */ | |
1068 | static void ext4_update_final_de(void *de_buf, int old_size, int new_size) | |
1069 | { | |
1070 | struct ext4_dir_entry_2 *de, *prev_de; | |
1071 | void *limit; | |
1072 | int de_len; | |
1073 | ||
1074 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1075 | if (old_size) { | |
1076 | limit = de_buf + old_size; | |
1077 | do { | |
1078 | prev_de = de; | |
1079 | de_len = ext4_rec_len_from_disk(de->rec_len, old_size); | |
1080 | de_buf += de_len; | |
1081 | de = (struct ext4_dir_entry_2 *)de_buf; | |
1082 | } while (de_buf < limit); | |
1083 | ||
1084 | prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - | |
1085 | old_size, new_size); | |
1086 | } else { | |
1087 | /* this is just created, so create an empty entry. */ | |
1088 | de->inode = 0; | |
1089 | de->rec_len = ext4_rec_len_to_disk(new_size, new_size); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, | |
1094 | struct ext4_iloc *iloc) | |
1095 | { | |
1096 | int ret; | |
1097 | int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; | |
1098 | int new_size = get_max_inline_xattr_value_size(dir, iloc); | |
1099 | ||
1100 | if (new_size - old_size <= EXT4_DIR_REC_LEN(1)) | |
1101 | return -ENOSPC; | |
1102 | ||
1103 | ret = ext4_update_inline_data(handle, dir, | |
1104 | new_size + EXT4_MIN_INLINE_DATA_SIZE); | |
1105 | if (ret) | |
1106 | return ret; | |
1107 | ||
1108 | ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, | |
1109 | EXT4_I(dir)->i_inline_size - | |
1110 | EXT4_MIN_INLINE_DATA_SIZE); | |
1111 | dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; | |
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, | |
1116 | struct ext4_iloc *iloc, | |
1117 | void *buf, int inline_size) | |
1118 | { | |
1119 | ext4_create_inline_data(handle, inode, inline_size); | |
1120 | ext4_write_inline_data(inode, iloc, buf, 0, inline_size); | |
1121 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
1122 | } | |
1123 | ||
1124 | static int ext4_finish_convert_inline_dir(handle_t *handle, | |
1125 | struct inode *inode, | |
1126 | struct buffer_head *dir_block, | |
1127 | void *buf, | |
1128 | int inline_size) | |
1129 | { | |
1130 | int err, csum_size = 0, header_size = 0; | |
1131 | struct ext4_dir_entry_2 *de; | |
1132 | struct ext4_dir_entry_tail *t; | |
1133 | void *target = dir_block->b_data; | |
1134 | ||
1135 | /* | |
1136 | * First create "." and ".." and then copy the dir information | |
1137 | * back to the block. | |
1138 | */ | |
1139 | de = (struct ext4_dir_entry_2 *)target; | |
1140 | de = ext4_init_dot_dotdot(inode, de, | |
1141 | inode->i_sb->s_blocksize, csum_size, | |
1142 | le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); | |
1143 | header_size = (void *)de - target; | |
1144 | ||
1145 | memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, | |
1146 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1147 | ||
9aa5d32b | 1148 | if (ext4_has_metadata_csum(inode->i_sb)) |
3c47d541 TM |
1149 | csum_size = sizeof(struct ext4_dir_entry_tail); |
1150 | ||
1151 | inode->i_size = inode->i_sb->s_blocksize; | |
1152 | i_size_write(inode, inode->i_sb->s_blocksize); | |
1153 | EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; | |
1154 | ext4_update_final_de(dir_block->b_data, | |
1155 | inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, | |
1156 | inode->i_sb->s_blocksize - csum_size); | |
1157 | ||
1158 | if (csum_size) { | |
1159 | t = EXT4_DIRENT_TAIL(dir_block->b_data, | |
1160 | inode->i_sb->s_blocksize); | |
1161 | initialize_dirent_tail(t, inode->i_sb->s_blocksize); | |
1162 | } | |
1163 | set_buffer_uptodate(dir_block); | |
1164 | err = ext4_handle_dirty_dirent_node(handle, inode, dir_block); | |
1165 | if (err) | |
b9cf625d | 1166 | return err; |
3c47d541 | 1167 | set_buffer_verified(dir_block); |
b9cf625d | 1168 | return ext4_mark_inode_dirty(handle, inode); |
3c47d541 TM |
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(inline_size, GFP_NOFS); | |
1183 | if (!buf) { | |
1184 | error = -ENOMEM; | |
1185 | goto out; | |
1186 | } | |
1187 | ||
1188 | error = ext4_read_inline_data(inode, buf, inline_size, iloc); | |
1189 | if (error < 0) | |
1190 | goto out; | |
1191 | ||
40b163f1 DW |
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(inode, iloc->bh, | |
1198 | buf + EXT4_INLINE_DOTDOT_SIZE, | |
1199 | inline_size - EXT4_INLINE_DOTDOT_SIZE); | |
1200 | if (error) | |
1201 | goto out; | |
1202 | } | |
1203 | ||
3c47d541 TM |
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, 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(inode->i_sb, map.m_pblk); | |
1220 | if (!data_bh) { | |
860d21e2 | 1221 | error = -ENOMEM; |
3c47d541 TM |
1222 | goto out_restore; |
1223 | } | |
1224 | ||
1225 | lock_buffer(data_bh); | |
1226 | error = ext4_journal_get_create_access(handle, data_bh); | |
1227 | if (error) { | |
1228 | unlock_buffer(data_bh); | |
1229 | error = -EIO; | |
1230 | goto out_restore; | |
1231 | } | |
1232 | memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); | |
1233 | ||
1234 | if (!S_ISDIR(inode->i_mode)) { | |
1235 | memcpy(data_bh->b_data, buf, inline_size); | |
1236 | set_buffer_uptodate(data_bh); | |
1237 | error = ext4_handle_dirty_metadata(handle, | |
1238 | inode, data_bh); | |
1239 | } else { | |
1240 | error = ext4_finish_convert_inline_dir(handle, inode, data_bh, | |
1241 | buf, inline_size); | |
1242 | } | |
1243 | ||
1244 | unlock_buffer(data_bh); | |
1245 | out_restore: | |
1246 | if (error) | |
1247 | ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); | |
1248 | ||
1249 | out: | |
1250 | brelse(data_bh); | |
1251 | kfree(buf); | |
1252 | return error; | |
1253 | } | |
1254 | ||
1255 | /* | |
1256 | * Try to add the new entry to the inline data. | |
1257 | * If succeeds, return 0. If not, extended the inline dir and copied data to | |
1258 | * the new created block. | |
1259 | */ | |
5b643f9c | 1260 | int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname, |
56a04915 | 1261 | struct inode *dir, struct inode *inode) |
3c47d541 | 1262 | { |
c755e251 | 1263 | int ret, inline_size, no_expand; |
3c47d541 TM |
1264 | void *inline_start; |
1265 | struct ext4_iloc iloc; | |
3c47d541 TM |
1266 | |
1267 | ret = ext4_get_inode_loc(dir, &iloc); | |
1268 | if (ret) | |
1269 | return ret; | |
1270 | ||
c755e251 | 1271 | ext4_write_lock_xattr(dir, &no_expand); |
3c47d541 TM |
1272 | if (!ext4_has_inline_data(dir)) |
1273 | goto out; | |
1274 | ||
1275 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1276 | EXT4_INLINE_DOTDOT_SIZE; | |
1277 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
1278 | ||
56a04915 | 1279 | ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc, |
3c47d541 TM |
1280 | inline_start, inline_size); |
1281 | if (ret != -ENOSPC) | |
1282 | goto out; | |
1283 | ||
1284 | /* check whether it can be inserted to inline xattr space. */ | |
1285 | inline_size = EXT4_I(dir)->i_inline_size - | |
1286 | EXT4_MIN_INLINE_DATA_SIZE; | |
1287 | if (!inline_size) { | |
1288 | /* Try to use the xattr space.*/ | |
1289 | ret = ext4_update_inline_dir(handle, dir, &iloc); | |
1290 | if (ret && ret != -ENOSPC) | |
1291 | goto out; | |
1292 | ||
1293 | inline_size = EXT4_I(dir)->i_inline_size - | |
1294 | EXT4_MIN_INLINE_DATA_SIZE; | |
1295 | } | |
1296 | ||
1297 | if (inline_size) { | |
1298 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1299 | ||
56a04915 | 1300 | ret = ext4_add_dirent_to_inline(handle, fname, dir, |
5b643f9c TT |
1301 | inode, &iloc, inline_start, |
1302 | inline_size); | |
3c47d541 TM |
1303 | |
1304 | if (ret != -ENOSPC) | |
1305 | goto out; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * The inline space is filled up, so create a new block for it. | |
1310 | * As the extent tree will be created, we have to save the inline | |
1311 | * dir first. | |
1312 | */ | |
1313 | ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); | |
1314 | ||
1315 | out: | |
c755e251 | 1316 | ext4_write_unlock_xattr(dir, &no_expand); |
b907f2d5 | 1317 | ext4_mark_inode_dirty(handle, dir); |
3c47d541 TM |
1318 | brelse(iloc.bh); |
1319 | return ret; | |
1320 | } | |
1321 | ||
8af0f082 TM |
1322 | /* |
1323 | * This function fills a red-black tree with information from an | |
1324 | * inlined dir. It returns the number directory entries loaded | |
1325 | * into the tree. If there is an error it is returned in err. | |
1326 | */ | |
1327 | int htree_inlinedir_to_tree(struct file *dir_file, | |
1328 | struct inode *dir, ext4_lblk_t block, | |
1329 | struct dx_hash_info *hinfo, | |
1330 | __u32 start_hash, __u32 start_minor_hash, | |
1331 | int *has_inline_data) | |
1332 | { | |
1333 | int err = 0, count = 0; | |
1334 | unsigned int parent_ino; | |
1335 | int pos; | |
1336 | struct ext4_dir_entry_2 *de; | |
1337 | struct inode *inode = file_inode(dir_file); | |
1338 | int ret, inline_size = 0; | |
1339 | struct ext4_iloc iloc; | |
1340 | void *dir_buf = NULL; | |
1341 | struct ext4_dir_entry_2 fake; | |
a7550b30 | 1342 | struct fscrypt_str tmp_str; |
8af0f082 TM |
1343 | |
1344 | ret = ext4_get_inode_loc(inode, &iloc); | |
1345 | if (ret) | |
1346 | return ret; | |
1347 | ||
1348 | down_read(&EXT4_I(inode)->xattr_sem); | |
1349 | if (!ext4_has_inline_data(inode)) { | |
1350 | up_read(&EXT4_I(inode)->xattr_sem); | |
1351 | *has_inline_data = 0; | |
1352 | goto out; | |
1353 | } | |
1354 | ||
1355 | inline_size = ext4_get_inline_size(inode); | |
1356 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1357 | if (!dir_buf) { | |
1358 | ret = -ENOMEM; | |
1359 | up_read(&EXT4_I(inode)->xattr_sem); | |
1360 | goto out; | |
1361 | } | |
1362 | ||
1363 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1364 | up_read(&EXT4_I(inode)->xattr_sem); | |
1365 | if (ret < 0) | |
1366 | goto out; | |
1367 | ||
1368 | pos = 0; | |
1369 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); | |
1370 | while (pos < inline_size) { | |
1371 | /* | |
1372 | * As inlined dir doesn't store any information about '.' and | |
1373 | * only the inode number of '..' is stored, we have to handle | |
1374 | * them differently. | |
1375 | */ | |
1376 | if (pos == 0) { | |
1377 | fake.inode = cpu_to_le32(inode->i_ino); | |
1378 | fake.name_len = 1; | |
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_OFFSET; | |
1386 | } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { | |
1387 | fake.inode = cpu_to_le32(parent_ino); | |
1388 | fake.name_len = 2; | |
1389 | strcpy(fake.name, ".."); | |
1390 | fake.rec_len = ext4_rec_len_to_disk( | |
1391 | EXT4_DIR_REC_LEN(fake.name_len), | |
1392 | inline_size); | |
1393 | ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); | |
1394 | de = &fake; | |
1395 | pos = EXT4_INLINE_DOTDOT_SIZE; | |
1396 | } else { | |
1397 | de = (struct ext4_dir_entry_2 *)(dir_buf + pos); | |
1398 | pos += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1399 | if (ext4_check_dir_entry(inode, dir_file, de, | |
1400 | iloc.bh, dir_buf, | |
1401 | inline_size, pos)) { | |
1402 | ret = count; | |
1403 | goto out; | |
1404 | } | |
1405 | } | |
1406 | ||
1407 | ext4fs_dirhash(de->name, de->name_len, hinfo); | |
1408 | if ((hinfo->hash < start_hash) || | |
1409 | ((hinfo->hash == start_hash) && | |
1410 | (hinfo->minor_hash < start_minor_hash))) | |
1411 | continue; | |
1412 | if (de->inode == 0) | |
1413 | continue; | |
2f61830a TT |
1414 | tmp_str.name = de->name; |
1415 | tmp_str.len = de->name_len; | |
1416 | err = ext4_htree_store_dirent(dir_file, hinfo->hash, | |
1417 | hinfo->minor_hash, de, &tmp_str); | |
8af0f082 TM |
1418 | if (err) { |
1419 | count = err; | |
1420 | goto out; | |
1421 | } | |
1422 | count++; | |
1423 | } | |
1424 | ret = count; | |
1425 | out: | |
1426 | kfree(dir_buf); | |
1427 | brelse(iloc.bh); | |
1428 | return ret; | |
1429 | } | |
1430 | ||
c4d8b023 TM |
1431 | /* |
1432 | * So this function is called when the volume is mkfsed with | |
1433 | * dir_index disabled. In order to keep f_pos persistent | |
1434 | * after we convert from an inlined dir to a blocked based, | |
1435 | * we just pretend that we are a normal dir and return the | |
1436 | * offset as if '.' and '..' really take place. | |
1437 | * | |
1438 | */ | |
725bebb2 AV |
1439 | int ext4_read_inline_dir(struct file *file, |
1440 | struct dir_context *ctx, | |
65d165d9 TM |
1441 | int *has_inline_data) |
1442 | { | |
65d165d9 | 1443 | unsigned int offset, parent_ino; |
725bebb2 | 1444 | int i; |
65d165d9 TM |
1445 | struct ext4_dir_entry_2 *de; |
1446 | struct super_block *sb; | |
725bebb2 | 1447 | struct inode *inode = file_inode(file); |
65d165d9 TM |
1448 | int ret, inline_size = 0; |
1449 | struct ext4_iloc iloc; | |
1450 | void *dir_buf = NULL; | |
c4d8b023 | 1451 | int dotdot_offset, dotdot_size, extra_offset, extra_size; |
65d165d9 TM |
1452 | |
1453 | ret = ext4_get_inode_loc(inode, &iloc); | |
1454 | if (ret) | |
1455 | return ret; | |
1456 | ||
1457 | down_read(&EXT4_I(inode)->xattr_sem); | |
1458 | if (!ext4_has_inline_data(inode)) { | |
1459 | up_read(&EXT4_I(inode)->xattr_sem); | |
1460 | *has_inline_data = 0; | |
1461 | goto out; | |
1462 | } | |
1463 | ||
1464 | inline_size = ext4_get_inline_size(inode); | |
1465 | dir_buf = kmalloc(inline_size, GFP_NOFS); | |
1466 | if (!dir_buf) { | |
1467 | ret = -ENOMEM; | |
1468 | up_read(&EXT4_I(inode)->xattr_sem); | |
1469 | goto out; | |
1470 | } | |
1471 | ||
1472 | ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); | |
1473 | up_read(&EXT4_I(inode)->xattr_sem); | |
1474 | if (ret < 0) | |
1475 | goto out; | |
1476 | ||
48ffdab1 | 1477 | ret = 0; |
65d165d9 | 1478 | sb = inode->i_sb; |
65d165d9 | 1479 | parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
725bebb2 | 1480 | offset = ctx->pos; |
c4d8b023 TM |
1481 | |
1482 | /* | |
1483 | * dotdot_offset and dotdot_size is the real offset and | |
1484 | * size for ".." and "." if the dir is block based while | |
1485 | * the real size for them are only EXT4_INLINE_DOTDOT_SIZE. | |
1486 | * So we will use extra_offset and extra_size to indicate them | |
1487 | * during the inline dir iteration. | |
1488 | */ | |
1489 | dotdot_offset = EXT4_DIR_REC_LEN(1); | |
1490 | dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2); | |
1491 | extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; | |
1492 | extra_size = extra_offset + inline_size; | |
65d165d9 | 1493 | |
725bebb2 AV |
1494 | /* |
1495 | * If the version has changed since the last call to | |
1496 | * readdir(2), then we might be pointing to an invalid | |
1497 | * dirent right now. Scan from the start of the inline | |
1498 | * dir to make sure. | |
1499 | */ | |
c472c07b | 1500 | if (!inode_eq_iversion(inode, file->f_version)) { |
725bebb2 AV |
1501 | for (i = 0; i < extra_size && i < offset;) { |
1502 | /* | |
1503 | * "." is with offset 0 and | |
1504 | * ".." is dotdot_offset. | |
1505 | */ | |
1506 | if (!i) { | |
1507 | i = dotdot_offset; | |
1508 | continue; | |
1509 | } else if (i == dotdot_offset) { | |
1510 | i = dotdot_size; | |
c4d8b023 TM |
1511 | continue; |
1512 | } | |
725bebb2 AV |
1513 | /* for other entry, the real offset in |
1514 | * the buf has to be tuned accordingly. | |
1515 | */ | |
1516 | de = (struct ext4_dir_entry_2 *) | |
1517 | (dir_buf + i - extra_offset); | |
1518 | /* It's too expensive to do a full | |
1519 | * dirent test each time round this | |
1520 | * loop, but we do have to test at | |
1521 | * least that it is non-zero. A | |
1522 | * failure will be detected in the | |
1523 | * dirent test below. */ | |
1524 | if (ext4_rec_len_from_disk(de->rec_len, extra_size) | |
1525 | < EXT4_DIR_REC_LEN(1)) | |
1526 | break; | |
1527 | i += ext4_rec_len_from_disk(de->rec_len, | |
1528 | extra_size); | |
1529 | } | |
1530 | offset = i; | |
1531 | ctx->pos = offset; | |
ee73f9a5 | 1532 | file->f_version = inode_query_iversion(inode); |
725bebb2 | 1533 | } |
65d165d9 | 1534 | |
725bebb2 AV |
1535 | while (ctx->pos < extra_size) { |
1536 | if (ctx->pos == 0) { | |
1537 | if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR)) | |
1538 | goto out; | |
1539 | ctx->pos = dotdot_offset; | |
1540 | continue; | |
1541 | } | |
65d165d9 | 1542 | |
725bebb2 AV |
1543 | if (ctx->pos == dotdot_offset) { |
1544 | if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR)) | |
1545 | goto out; | |
1546 | ctx->pos = dotdot_size; | |
1547 | continue; | |
1548 | } | |
65d165d9 | 1549 | |
725bebb2 AV |
1550 | de = (struct ext4_dir_entry_2 *) |
1551 | (dir_buf + ctx->pos - extra_offset); | |
1552 | if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf, | |
1553 | extra_size, ctx->pos)) | |
1554 | goto out; | |
1555 | if (le32_to_cpu(de->inode)) { | |
1556 | if (!dir_emit(ctx, de->name, de->name_len, | |
1557 | le32_to_cpu(de->inode), | |
1558 | get_dtype(sb, de->file_type))) | |
65d165d9 | 1559 | goto out; |
65d165d9 | 1560 | } |
725bebb2 | 1561 | ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size); |
65d165d9 TM |
1562 | } |
1563 | out: | |
1564 | kfree(dir_buf); | |
1565 | brelse(iloc.bh); | |
1566 | return ret; | |
1567 | } | |
1568 | ||
32f7f22c TM |
1569 | struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
1570 | struct ext4_dir_entry_2 **parent_de, | |
1571 | int *retval) | |
1572 | { | |
1573 | struct ext4_iloc iloc; | |
1574 | ||
1575 | *retval = ext4_get_inode_loc(inode, &iloc); | |
1576 | if (*retval) | |
1577 | return NULL; | |
1578 | ||
1579 | *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1580 | ||
1581 | return iloc.bh; | |
1582 | } | |
1583 | ||
3c47d541 TM |
1584 | /* |
1585 | * Try to create the inline data for the new dir. | |
1586 | * If it succeeds, return 0, otherwise return the error. | |
1587 | * In case of ENOSPC, the caller should create the normal disk layout dir. | |
1588 | */ | |
1589 | int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, | |
1590 | struct inode *inode) | |
1591 | { | |
1592 | int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1593 | struct ext4_iloc iloc; | |
1594 | struct ext4_dir_entry_2 *de; | |
1595 | ||
1596 | ret = ext4_get_inode_loc(inode, &iloc); | |
1597 | if (ret) | |
1598 | return ret; | |
1599 | ||
1600 | ret = ext4_prepare_inline_data(handle, inode, inline_size); | |
1601 | if (ret) | |
1602 | goto out; | |
1603 | ||
1604 | /* | |
1605 | * For inline dir, we only save the inode information for the ".." | |
1606 | * and create a fake dentry to cover the left space. | |
1607 | */ | |
1608 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1609 | de->inode = cpu_to_le32(parent->i_ino); | |
1610 | de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); | |
1611 | de->inode = 0; | |
1612 | de->rec_len = ext4_rec_len_to_disk( | |
1613 | inline_size - EXT4_INLINE_DOTDOT_SIZE, | |
1614 | inline_size); | |
1615 | set_nlink(inode, 2); | |
1616 | inode->i_size = EXT4_I(inode)->i_disksize = inline_size; | |
1617 | out: | |
1618 | brelse(iloc.bh); | |
1619 | return ret; | |
1620 | } | |
1621 | ||
e8e948e7 | 1622 | struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
5b643f9c | 1623 | struct ext4_filename *fname, |
e8e948e7 TM |
1624 | struct ext4_dir_entry_2 **res_dir, |
1625 | int *has_inline_data) | |
1626 | { | |
1627 | int ret; | |
1628 | struct ext4_iloc iloc; | |
1629 | void *inline_start; | |
1630 | int inline_size; | |
1631 | ||
1632 | if (ext4_get_inode_loc(dir, &iloc)) | |
1633 | return NULL; | |
1634 | ||
1635 | down_read(&EXT4_I(dir)->xattr_sem); | |
1636 | if (!ext4_has_inline_data(dir)) { | |
1637 | *has_inline_data = 0; | |
1638 | goto out; | |
1639 | } | |
1640 | ||
1641 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1642 | EXT4_INLINE_DOTDOT_SIZE; | |
1643 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; | |
5b643f9c | 1644 | ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
d6b97550 | 1645 | dir, fname, 0, res_dir); |
e8e948e7 TM |
1646 | if (ret == 1) |
1647 | goto out_find; | |
1648 | if (ret < 0) | |
1649 | goto out; | |
1650 | ||
1651 | if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE) | |
1652 | goto out; | |
1653 | ||
1654 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1655 | inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE; | |
1656 | ||
5b643f9c | 1657 | ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
d6b97550 | 1658 | dir, fname, 0, res_dir); |
e8e948e7 TM |
1659 | if (ret == 1) |
1660 | goto out_find; | |
1661 | ||
1662 | out: | |
1663 | brelse(iloc.bh); | |
1664 | iloc.bh = NULL; | |
1665 | out_find: | |
1666 | up_read(&EXT4_I(dir)->xattr_sem); | |
1667 | return iloc.bh; | |
1668 | } | |
1669 | ||
9f40fe54 TM |
1670 | int ext4_delete_inline_entry(handle_t *handle, |
1671 | struct inode *dir, | |
1672 | struct ext4_dir_entry_2 *de_del, | |
1673 | struct buffer_head *bh, | |
1674 | int *has_inline_data) | |
1675 | { | |
c755e251 | 1676 | int err, inline_size, no_expand; |
9f40fe54 TM |
1677 | struct ext4_iloc iloc; |
1678 | void *inline_start; | |
1679 | ||
1680 | err = ext4_get_inode_loc(dir, &iloc); | |
1681 | if (err) | |
1682 | return err; | |
1683 | ||
c755e251 | 1684 | ext4_write_lock_xattr(dir, &no_expand); |
9f40fe54 TM |
1685 | if (!ext4_has_inline_data(dir)) { |
1686 | *has_inline_data = 0; | |
1687 | goto out; | |
1688 | } | |
1689 | ||
1690 | if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) < | |
1691 | EXT4_MIN_INLINE_DATA_SIZE) { | |
1692 | inline_start = (void *)ext4_raw_inode(&iloc)->i_block + | |
1693 | EXT4_INLINE_DOTDOT_SIZE; | |
1694 | inline_size = EXT4_MIN_INLINE_DATA_SIZE - | |
1695 | EXT4_INLINE_DOTDOT_SIZE; | |
1696 | } else { | |
1697 | inline_start = ext4_get_inline_xattr_pos(dir, &iloc); | |
1698 | inline_size = ext4_get_inline_size(dir) - | |
1699 | EXT4_MIN_INLINE_DATA_SIZE; | |
1700 | } | |
1701 | ||
5d601255 | 1702 | BUFFER_TRACE(bh, "get_write_access"); |
9f40fe54 TM |
1703 | err = ext4_journal_get_write_access(handle, bh); |
1704 | if (err) | |
1705 | goto out; | |
1706 | ||
1707 | err = ext4_generic_delete_entry(handle, dir, de_del, bh, | |
1708 | inline_start, inline_size, 0); | |
1709 | if (err) | |
1710 | goto out; | |
1711 | ||
9f40fe54 TM |
1712 | ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); |
1713 | out: | |
c755e251 | 1714 | ext4_write_unlock_xattr(dir, &no_expand); |
b907f2d5 TT |
1715 | if (likely(err == 0)) |
1716 | err = ext4_mark_inode_dirty(handle, dir); | |
9f40fe54 TM |
1717 | brelse(iloc.bh); |
1718 | if (err != -ENOENT) | |
1719 | ext4_std_error(dir->i_sb, err); | |
1720 | return err; | |
1721 | } | |
1722 | ||
61f86638 TM |
1723 | /* |
1724 | * Get the inline dentry at offset. | |
1725 | */ | |
1726 | static inline struct ext4_dir_entry_2 * | |
1727 | ext4_get_inline_entry(struct inode *inode, | |
1728 | struct ext4_iloc *iloc, | |
1729 | unsigned int offset, | |
1730 | void **inline_start, | |
1731 | int *inline_size) | |
1732 | { | |
1733 | void *inline_pos; | |
1734 | ||
1735 | BUG_ON(offset > ext4_get_inline_size(inode)); | |
1736 | ||
1737 | if (offset < EXT4_MIN_INLINE_DATA_SIZE) { | |
1738 | inline_pos = (void *)ext4_raw_inode(iloc)->i_block; | |
1739 | *inline_size = EXT4_MIN_INLINE_DATA_SIZE; | |
1740 | } else { | |
1741 | inline_pos = ext4_get_inline_xattr_pos(inode, iloc); | |
1742 | offset -= EXT4_MIN_INLINE_DATA_SIZE; | |
1743 | *inline_size = ext4_get_inline_size(inode) - | |
1744 | EXT4_MIN_INLINE_DATA_SIZE; | |
1745 | } | |
1746 | ||
1747 | if (inline_start) | |
1748 | *inline_start = inline_pos; | |
1749 | return (struct ext4_dir_entry_2 *)(inline_pos + offset); | |
1750 | } | |
1751 | ||
a7550b30 | 1752 | bool empty_inline_dir(struct inode *dir, int *has_inline_data) |
61f86638 TM |
1753 | { |
1754 | int err, inline_size; | |
1755 | struct ext4_iloc iloc; | |
4d982e25 | 1756 | size_t inline_len; |
61f86638 TM |
1757 | void *inline_pos; |
1758 | unsigned int offset; | |
1759 | struct ext4_dir_entry_2 *de; | |
a7550b30 | 1760 | bool ret = true; |
61f86638 TM |
1761 | |
1762 | err = ext4_get_inode_loc(dir, &iloc); | |
1763 | if (err) { | |
1764 | EXT4_ERROR_INODE(dir, "error %d getting inode %lu block", | |
1765 | err, dir->i_ino); | |
a7550b30 | 1766 | return true; |
61f86638 TM |
1767 | } |
1768 | ||
1769 | down_read(&EXT4_I(dir)->xattr_sem); | |
1770 | if (!ext4_has_inline_data(dir)) { | |
1771 | *has_inline_data = 0; | |
1772 | goto out; | |
1773 | } | |
1774 | ||
1775 | de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; | |
1776 | if (!le32_to_cpu(de->inode)) { | |
1777 | ext4_warning(dir->i_sb, | |
1778 | "bad inline directory (dir #%lu) - no `..'", | |
1779 | dir->i_ino); | |
a7550b30 | 1780 | ret = true; |
61f86638 TM |
1781 | goto out; |
1782 | } | |
1783 | ||
4d982e25 | 1784 | inline_len = ext4_get_inline_size(dir); |
61f86638 | 1785 | offset = EXT4_INLINE_DOTDOT_SIZE; |
4d982e25 | 1786 | while (offset < inline_len) { |
61f86638 TM |
1787 | de = ext4_get_inline_entry(dir, &iloc, offset, |
1788 | &inline_pos, &inline_size); | |
1789 | if (ext4_check_dir_entry(dir, NULL, de, | |
1790 | iloc.bh, inline_pos, | |
1791 | inline_size, offset)) { | |
1792 | ext4_warning(dir->i_sb, | |
1793 | "bad inline directory (dir #%lu) - " | |
1794 | "inode %u, rec_len %u, name_len %d" | |
8d2ae1cb | 1795 | "inline size %d", |
61f86638 TM |
1796 | dir->i_ino, le32_to_cpu(de->inode), |
1797 | le16_to_cpu(de->rec_len), de->name_len, | |
1798 | inline_size); | |
a7550b30 | 1799 | ret = true; |
61f86638 TM |
1800 | goto out; |
1801 | } | |
1802 | if (le32_to_cpu(de->inode)) { | |
a7550b30 | 1803 | ret = false; |
61f86638 TM |
1804 | goto out; |
1805 | } | |
1806 | offset += ext4_rec_len_from_disk(de->rec_len, inline_size); | |
1807 | } | |
1808 | ||
1809 | out: | |
1810 | up_read(&EXT4_I(dir)->xattr_sem); | |
1811 | brelse(iloc.bh); | |
1812 | return ret; | |
1813 | } | |
1814 | ||
67cf5b09 TM |
1815 | int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
1816 | { | |
c755e251 | 1817 | int ret, no_expand; |
67cf5b09 | 1818 | |
c755e251 | 1819 | ext4_write_lock_xattr(inode, &no_expand); |
67cf5b09 | 1820 | ret = ext4_destroy_inline_data_nolock(handle, inode); |
c755e251 | 1821 | ext4_write_unlock_xattr(inode, &no_expand); |
67cf5b09 TM |
1822 | |
1823 | return ret; | |
1824 | } | |
94191985 | 1825 | |
7046ae35 AG |
1826 | int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap) |
1827 | { | |
1828 | __u64 addr; | |
1829 | int error = -EAGAIN; | |
1830 | struct ext4_iloc iloc; | |
1831 | ||
1832 | down_read(&EXT4_I(inode)->xattr_sem); | |
1833 | if (!ext4_has_inline_data(inode)) | |
1834 | goto out; | |
1835 | ||
1836 | error = ext4_get_inode_loc(inode, &iloc); | |
1837 | if (error) | |
1838 | goto out; | |
1839 | ||
1840 | addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; | |
1841 | addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; | |
1842 | addr += offsetof(struct ext4_inode, i_block); | |
1843 | ||
1844 | brelse(iloc.bh); | |
1845 | ||
1846 | iomap->addr = addr; | |
1847 | iomap->offset = 0; | |
1848 | iomap->length = min_t(loff_t, ext4_get_inline_size(inode), | |
1849 | i_size_read(inode)); | |
19319b53 CH |
1850 | iomap->type = IOMAP_INLINE; |
1851 | iomap->flags = 0; | |
7046ae35 AG |
1852 | |
1853 | out: | |
1854 | up_read(&EXT4_I(inode)->xattr_sem); | |
1855 | return error; | |
1856 | } | |
1857 | ||
94191985 TM |
1858 | int ext4_inline_data_fiemap(struct inode *inode, |
1859 | struct fiemap_extent_info *fieinfo, | |
d952d69e | 1860 | int *has_inline, __u64 start, __u64 len) |
94191985 TM |
1861 | { |
1862 | __u64 physical = 0; | |
d952d69e DM |
1863 | __u64 inline_len; |
1864 | __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED | | |
1865 | FIEMAP_EXTENT_LAST; | |
94191985 TM |
1866 | int error = 0; |
1867 | struct ext4_iloc iloc; | |
1868 | ||
1869 | down_read(&EXT4_I(inode)->xattr_sem); | |
1870 | if (!ext4_has_inline_data(inode)) { | |
1871 | *has_inline = 0; | |
1872 | goto out; | |
1873 | } | |
d952d69e DM |
1874 | inline_len = min_t(size_t, ext4_get_inline_size(inode), |
1875 | i_size_read(inode)); | |
1876 | if (start >= inline_len) | |
1877 | goto out; | |
1878 | if (start + len < inline_len) | |
1879 | inline_len = start + len; | |
1880 | inline_len -= start; | |
94191985 TM |
1881 | |
1882 | error = ext4_get_inode_loc(inode, &iloc); | |
1883 | if (error) | |
1884 | goto out; | |
1885 | ||
eaf37937 | 1886 | physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
94191985 TM |
1887 | physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; |
1888 | physical += offsetof(struct ext4_inode, i_block); | |
94191985 TM |
1889 | |
1890 | if (physical) | |
d952d69e DM |
1891 | error = fiemap_fill_next_extent(fieinfo, start, physical, |
1892 | inline_len, flags); | |
94191985 TM |
1893 | brelse(iloc.bh); |
1894 | out: | |
1895 | up_read(&EXT4_I(inode)->xattr_sem); | |
1896 | return (error < 0 ? error : 0); | |
1897 | } | |
0d812f77 | 1898 | |
01daf945 | 1899 | int ext4_inline_data_truncate(struct inode *inode, int *has_inline) |
aef1c851 TM |
1900 | { |
1901 | handle_t *handle; | |
01daf945 | 1902 | int inline_size, value_len, needed_blocks, no_expand, err = 0; |
aef1c851 TM |
1903 | size_t i_size; |
1904 | void *value = NULL; | |
1905 | struct ext4_xattr_ibody_find is = { | |
1906 | .s = { .not_found = -ENODATA, }, | |
1907 | }; | |
1908 | struct ext4_xattr_info i = { | |
1909 | .name_index = EXT4_XATTR_INDEX_SYSTEM, | |
1910 | .name = EXT4_XATTR_SYSTEM_DATA, | |
1911 | }; | |
1912 | ||
1913 | ||
1914 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
9924a92a | 1915 | handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
aef1c851 | 1916 | if (IS_ERR(handle)) |
01daf945 | 1917 | return PTR_ERR(handle); |
aef1c851 | 1918 | |
c755e251 | 1919 | ext4_write_lock_xattr(inode, &no_expand); |
aef1c851 TM |
1920 | if (!ext4_has_inline_data(inode)) { |
1921 | *has_inline = 0; | |
1922 | ext4_journal_stop(handle); | |
01daf945 | 1923 | return 0; |
aef1c851 TM |
1924 | } |
1925 | ||
01daf945 | 1926 | if ((err = ext4_orphan_add(handle, inode)) != 0) |
aef1c851 TM |
1927 | goto out; |
1928 | ||
01daf945 | 1929 | if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0) |
aef1c851 TM |
1930 | goto out; |
1931 | ||
1932 | down_write(&EXT4_I(inode)->i_data_sem); | |
1933 | i_size = inode->i_size; | |
1934 | inline_size = ext4_get_inline_size(inode); | |
1935 | EXT4_I(inode)->i_disksize = i_size; | |
1936 | ||
1937 | if (i_size < inline_size) { | |
1938 | /* Clear the content in the xattr space. */ | |
1939 | if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { | |
01daf945 | 1940 | if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0) |
aef1c851 TM |
1941 | goto out_error; |
1942 | ||
1943 | BUG_ON(is.s.not_found); | |
1944 | ||
1945 | value_len = le32_to_cpu(is.s.here->e_value_size); | |
1946 | value = kmalloc(value_len, GFP_NOFS); | |
01daf945 TT |
1947 | if (!value) { |
1948 | err = -ENOMEM; | |
aef1c851 | 1949 | goto out_error; |
01daf945 | 1950 | } |
aef1c851 | 1951 | |
01daf945 TT |
1952 | err = ext4_xattr_ibody_get(inode, i.name_index, |
1953 | i.name, value, value_len); | |
1954 | if (err <= 0) | |
aef1c851 TM |
1955 | goto out_error; |
1956 | ||
1957 | i.value = value; | |
1958 | i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? | |
1959 | i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; | |
01daf945 TT |
1960 | err = ext4_xattr_ibody_inline_set(handle, inode, |
1961 | &i, &is); | |
1962 | if (err) | |
aef1c851 TM |
1963 | goto out_error; |
1964 | } | |
1965 | ||
1966 | /* Clear the content within i_blocks. */ | |
09c455aa TT |
1967 | if (i_size < EXT4_MIN_INLINE_DATA_SIZE) { |
1968 | void *p = (void *) ext4_raw_inode(&is.iloc)->i_block; | |
1969 | memset(p + i_size, 0, | |
1970 | EXT4_MIN_INLINE_DATA_SIZE - i_size); | |
1971 | } | |
aef1c851 TM |
1972 | |
1973 | EXT4_I(inode)->i_inline_size = i_size < | |
1974 | EXT4_MIN_INLINE_DATA_SIZE ? | |
1975 | EXT4_MIN_INLINE_DATA_SIZE : i_size; | |
1976 | } | |
1977 | ||
1978 | out_error: | |
1979 | up_write(&EXT4_I(inode)->i_data_sem); | |
1980 | out: | |
1981 | brelse(is.iloc.bh); | |
c755e251 | 1982 | ext4_write_unlock_xattr(inode, &no_expand); |
aef1c851 TM |
1983 | kfree(value); |
1984 | if (inode->i_nlink) | |
1985 | ext4_orphan_del(handle, inode); | |
1986 | ||
01daf945 TT |
1987 | if (err == 0) { |
1988 | inode->i_mtime = inode->i_ctime = current_time(inode); | |
1989 | err = ext4_mark_inode_dirty(handle, inode); | |
1990 | if (IS_SYNC(inode)) | |
1991 | ext4_handle_sync(handle); | |
1992 | } | |
aef1c851 | 1993 | ext4_journal_stop(handle); |
01daf945 | 1994 | return err; |
aef1c851 | 1995 | } |
0c8d414f TM |
1996 | |
1997 | int ext4_convert_inline_data(struct inode *inode) | |
1998 | { | |
c755e251 | 1999 | int error, needed_blocks, no_expand; |
0c8d414f TM |
2000 | handle_t *handle; |
2001 | struct ext4_iloc iloc; | |
2002 | ||
2003 | if (!ext4_has_inline_data(inode)) { | |
2004 | ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); | |
2005 | return 0; | |
2006 | } | |
2007 | ||
2008 | needed_blocks = ext4_writepage_trans_blocks(inode); | |
2009 | ||
2010 | iloc.bh = NULL; | |
2011 | error = ext4_get_inode_loc(inode, &iloc); | |
2012 | if (error) | |
2013 | return error; | |
2014 | ||
9924a92a | 2015 | handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
0c8d414f TM |
2016 | if (IS_ERR(handle)) { |
2017 | error = PTR_ERR(handle); | |
2018 | goto out_free; | |
2019 | } | |
2020 | ||
c755e251 TT |
2021 | ext4_write_lock_xattr(inode, &no_expand); |
2022 | if (ext4_has_inline_data(inode)) | |
2023 | error = ext4_convert_inline_data_nolock(handle, inode, &iloc); | |
2024 | ext4_write_unlock_xattr(inode, &no_expand); | |
0c8d414f TM |
2025 | ext4_journal_stop(handle); |
2026 | out_free: | |
2027 | brelse(iloc.bh); | |
2028 | return error; | |
2029 | } |