Commit | Line | Data |
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a86c6181 AT |
1 | /* |
2 | * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com | |
3 | * Written by Alex Tomas <alex@clusterfs.com> | |
4 | * | |
5 | * Architecture independence: | |
6 | * Copyright (c) 2005, Bull S.A. | |
7 | * Written by Pierre Peiffer <pierre.peiffer@bull.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public Licens | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- | |
21 | */ | |
22 | ||
23 | /* | |
24 | * Extents support for EXT4 | |
25 | * | |
26 | * TODO: | |
27 | * - ext4*_error() should be used in some situations | |
28 | * - analyze all BUG()/BUG_ON(), use -EIO where appropriate | |
29 | * - smart tree reduction | |
30 | */ | |
31 | ||
a86c6181 AT |
32 | #include <linux/fs.h> |
33 | #include <linux/time.h> | |
cd02ff0b | 34 | #include <linux/jbd2.h> |
a86c6181 AT |
35 | #include <linux/highuid.h> |
36 | #include <linux/pagemap.h> | |
37 | #include <linux/quotaops.h> | |
38 | #include <linux/string.h> | |
39 | #include <linux/slab.h> | |
a2df2a63 | 40 | #include <linux/falloc.h> |
a86c6181 | 41 | #include <asm/uaccess.h> |
6873fa0d | 42 | #include <linux/fiemap.h> |
3dcf5451 | 43 | #include "ext4_jbd2.h" |
4a092d73 | 44 | #include "ext4_extents.h" |
a86c6181 | 45 | |
0562e0ba JZ |
46 | #include <trace/events/ext4.h> |
47 | ||
5f95d21f LC |
48 | /* |
49 | * used by extent splitting. | |
50 | */ | |
51 | #define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \ | |
52 | due to ENOSPC */ | |
53 | #define EXT4_EXT_MARK_UNINIT1 0x2 /* mark first half uninitialized */ | |
54 | #define EXT4_EXT_MARK_UNINIT2 0x4 /* mark second half uninitialized */ | |
55 | ||
dee1f973 DM |
56 | #define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */ |
57 | #define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */ | |
58 | ||
7ac5990d DW |
59 | static __le32 ext4_extent_block_csum(struct inode *inode, |
60 | struct ext4_extent_header *eh) | |
61 | { | |
62 | struct ext4_inode_info *ei = EXT4_I(inode); | |
63 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
64 | __u32 csum; | |
65 | ||
66 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh, | |
67 | EXT4_EXTENT_TAIL_OFFSET(eh)); | |
68 | return cpu_to_le32(csum); | |
69 | } | |
70 | ||
71 | static int ext4_extent_block_csum_verify(struct inode *inode, | |
72 | struct ext4_extent_header *eh) | |
73 | { | |
74 | struct ext4_extent_tail *et; | |
75 | ||
76 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
77 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
78 | return 1; | |
79 | ||
80 | et = find_ext4_extent_tail(eh); | |
81 | if (et->et_checksum != ext4_extent_block_csum(inode, eh)) | |
82 | return 0; | |
83 | return 1; | |
84 | } | |
85 | ||
86 | static void ext4_extent_block_csum_set(struct inode *inode, | |
87 | struct ext4_extent_header *eh) | |
88 | { | |
89 | struct ext4_extent_tail *et; | |
90 | ||
91 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
92 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
93 | return; | |
94 | ||
95 | et = find_ext4_extent_tail(eh); | |
96 | et->et_checksum = ext4_extent_block_csum(inode, eh); | |
97 | } | |
98 | ||
d583fb87 AH |
99 | static int ext4_split_extent(handle_t *handle, |
100 | struct inode *inode, | |
101 | struct ext4_ext_path *path, | |
102 | struct ext4_map_blocks *map, | |
103 | int split_flag, | |
104 | int flags); | |
105 | ||
5f95d21f LC |
106 | static int ext4_split_extent_at(handle_t *handle, |
107 | struct inode *inode, | |
108 | struct ext4_ext_path *path, | |
109 | ext4_lblk_t split, | |
110 | int split_flag, | |
111 | int flags); | |
112 | ||
91dd8c11 LC |
113 | static int ext4_find_delayed_extent(struct inode *inode, |
114 | struct ext4_ext_cache *newex); | |
115 | ||
487caeef JK |
116 | static int ext4_ext_truncate_extend_restart(handle_t *handle, |
117 | struct inode *inode, | |
118 | int needed) | |
a86c6181 AT |
119 | { |
120 | int err; | |
121 | ||
0390131b FM |
122 | if (!ext4_handle_valid(handle)) |
123 | return 0; | |
a86c6181 | 124 | if (handle->h_buffer_credits > needed) |
9102e4fa SF |
125 | return 0; |
126 | err = ext4_journal_extend(handle, needed); | |
0123c939 | 127 | if (err <= 0) |
9102e4fa | 128 | return err; |
487caeef | 129 | err = ext4_truncate_restart_trans(handle, inode, needed); |
0617b83f DM |
130 | if (err == 0) |
131 | err = -EAGAIN; | |
487caeef JK |
132 | |
133 | return err; | |
a86c6181 AT |
134 | } |
135 | ||
136 | /* | |
137 | * could return: | |
138 | * - EROFS | |
139 | * - ENOMEM | |
140 | */ | |
141 | static int ext4_ext_get_access(handle_t *handle, struct inode *inode, | |
142 | struct ext4_ext_path *path) | |
143 | { | |
144 | if (path->p_bh) { | |
145 | /* path points to block */ | |
146 | return ext4_journal_get_write_access(handle, path->p_bh); | |
147 | } | |
148 | /* path points to leaf/index in inode body */ | |
149 | /* we use in-core data, no need to protect them */ | |
150 | return 0; | |
151 | } | |
152 | ||
153 | /* | |
154 | * could return: | |
155 | * - EROFS | |
156 | * - ENOMEM | |
157 | * - EIO | |
158 | */ | |
9ea7a0df TT |
159 | #define ext4_ext_dirty(handle, inode, path) \ |
160 | __ext4_ext_dirty(__func__, __LINE__, (handle), (inode), (path)) | |
161 | static int __ext4_ext_dirty(const char *where, unsigned int line, | |
162 | handle_t *handle, struct inode *inode, | |
163 | struct ext4_ext_path *path) | |
a86c6181 AT |
164 | { |
165 | int err; | |
166 | if (path->p_bh) { | |
7ac5990d | 167 | ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh)); |
a86c6181 | 168 | /* path points to block */ |
9ea7a0df TT |
169 | err = __ext4_handle_dirty_metadata(where, line, handle, |
170 | inode, path->p_bh); | |
a86c6181 AT |
171 | } else { |
172 | /* path points to leaf/index in inode body */ | |
173 | err = ext4_mark_inode_dirty(handle, inode); | |
174 | } | |
175 | return err; | |
176 | } | |
177 | ||
f65e6fba | 178 | static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode, |
a86c6181 | 179 | struct ext4_ext_path *path, |
725d26d3 | 180 | ext4_lblk_t block) |
a86c6181 | 181 | { |
a86c6181 | 182 | if (path) { |
81fdbb4a | 183 | int depth = path->p_depth; |
a86c6181 | 184 | struct ext4_extent *ex; |
a86c6181 | 185 | |
ad4fb9ca KM |
186 | /* |
187 | * Try to predict block placement assuming that we are | |
188 | * filling in a file which will eventually be | |
189 | * non-sparse --- i.e., in the case of libbfd writing | |
190 | * an ELF object sections out-of-order but in a way | |
191 | * the eventually results in a contiguous object or | |
192 | * executable file, or some database extending a table | |
193 | * space file. However, this is actually somewhat | |
194 | * non-ideal if we are writing a sparse file such as | |
195 | * qemu or KVM writing a raw image file that is going | |
196 | * to stay fairly sparse, since it will end up | |
197 | * fragmenting the file system's free space. Maybe we | |
198 | * should have some hueristics or some way to allow | |
199 | * userspace to pass a hint to file system, | |
b8d6568a | 200 | * especially if the latter case turns out to be |
ad4fb9ca KM |
201 | * common. |
202 | */ | |
7e028976 | 203 | ex = path[depth].p_ext; |
ad4fb9ca KM |
204 | if (ex) { |
205 | ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex); | |
206 | ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block); | |
207 | ||
208 | if (block > ext_block) | |
209 | return ext_pblk + (block - ext_block); | |
210 | else | |
211 | return ext_pblk - (ext_block - block); | |
212 | } | |
a86c6181 | 213 | |
d0d856e8 RD |
214 | /* it looks like index is empty; |
215 | * try to find starting block from index itself */ | |
a86c6181 AT |
216 | if (path[depth].p_bh) |
217 | return path[depth].p_bh->b_blocknr; | |
218 | } | |
219 | ||
220 | /* OK. use inode's group */ | |
f86186b4 | 221 | return ext4_inode_to_goal_block(inode); |
a86c6181 AT |
222 | } |
223 | ||
654b4908 AK |
224 | /* |
225 | * Allocation for a meta data block | |
226 | */ | |
f65e6fba | 227 | static ext4_fsblk_t |
654b4908 | 228 | ext4_ext_new_meta_block(handle_t *handle, struct inode *inode, |
a86c6181 | 229 | struct ext4_ext_path *path, |
55f020db | 230 | struct ext4_extent *ex, int *err, unsigned int flags) |
a86c6181 | 231 | { |
f65e6fba | 232 | ext4_fsblk_t goal, newblock; |
a86c6181 AT |
233 | |
234 | goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block)); | |
55f020db AH |
235 | newblock = ext4_new_meta_blocks(handle, inode, goal, flags, |
236 | NULL, err); | |
a86c6181 AT |
237 | return newblock; |
238 | } | |
239 | ||
55ad63bf | 240 | static inline int ext4_ext_space_block(struct inode *inode, int check) |
a86c6181 AT |
241 | { |
242 | int size; | |
243 | ||
244 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) | |
245 | / sizeof(struct ext4_extent); | |
bbf2f9fb | 246 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
247 | if (!check && size > 6) |
248 | size = 6; | |
a86c6181 AT |
249 | #endif |
250 | return size; | |
251 | } | |
252 | ||
55ad63bf | 253 | static inline int ext4_ext_space_block_idx(struct inode *inode, int check) |
a86c6181 AT |
254 | { |
255 | int size; | |
256 | ||
257 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) | |
258 | / sizeof(struct ext4_extent_idx); | |
bbf2f9fb | 259 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
260 | if (!check && size > 5) |
261 | size = 5; | |
a86c6181 AT |
262 | #endif |
263 | return size; | |
264 | } | |
265 | ||
55ad63bf | 266 | static inline int ext4_ext_space_root(struct inode *inode, int check) |
a86c6181 AT |
267 | { |
268 | int size; | |
269 | ||
270 | size = sizeof(EXT4_I(inode)->i_data); | |
271 | size -= sizeof(struct ext4_extent_header); | |
272 | size /= sizeof(struct ext4_extent); | |
bbf2f9fb | 273 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
274 | if (!check && size > 3) |
275 | size = 3; | |
a86c6181 AT |
276 | #endif |
277 | return size; | |
278 | } | |
279 | ||
55ad63bf | 280 | static inline int ext4_ext_space_root_idx(struct inode *inode, int check) |
a86c6181 AT |
281 | { |
282 | int size; | |
283 | ||
284 | size = sizeof(EXT4_I(inode)->i_data); | |
285 | size -= sizeof(struct ext4_extent_header); | |
286 | size /= sizeof(struct ext4_extent_idx); | |
bbf2f9fb | 287 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
288 | if (!check && size > 4) |
289 | size = 4; | |
a86c6181 AT |
290 | #endif |
291 | return size; | |
292 | } | |
293 | ||
d2a17637 MC |
294 | /* |
295 | * Calculate the number of metadata blocks needed | |
296 | * to allocate @blocks | |
297 | * Worse case is one block per extent | |
298 | */ | |
01f49d0b | 299 | int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 300 | { |
9d0be502 | 301 | struct ext4_inode_info *ei = EXT4_I(inode); |
81fdbb4a | 302 | int idxs; |
d2a17637 | 303 | |
9d0be502 TT |
304 | idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
305 | / sizeof(struct ext4_extent_idx)); | |
d2a17637 MC |
306 | |
307 | /* | |
9d0be502 TT |
308 | * If the new delayed allocation block is contiguous with the |
309 | * previous da block, it can share index blocks with the | |
310 | * previous block, so we only need to allocate a new index | |
311 | * block every idxs leaf blocks. At ldxs**2 blocks, we need | |
312 | * an additional index block, and at ldxs**3 blocks, yet | |
313 | * another index blocks. | |
d2a17637 | 314 | */ |
9d0be502 TT |
315 | if (ei->i_da_metadata_calc_len && |
316 | ei->i_da_metadata_calc_last_lblock+1 == lblock) { | |
81fdbb4a YY |
317 | int num = 0; |
318 | ||
9d0be502 TT |
319 | if ((ei->i_da_metadata_calc_len % idxs) == 0) |
320 | num++; | |
321 | if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0) | |
322 | num++; | |
323 | if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) { | |
324 | num++; | |
325 | ei->i_da_metadata_calc_len = 0; | |
326 | } else | |
327 | ei->i_da_metadata_calc_len++; | |
328 | ei->i_da_metadata_calc_last_lblock++; | |
329 | return num; | |
330 | } | |
d2a17637 | 331 | |
9d0be502 TT |
332 | /* |
333 | * In the worst case we need a new set of index blocks at | |
334 | * every level of the inode's extent tree. | |
335 | */ | |
336 | ei->i_da_metadata_calc_len = 1; | |
337 | ei->i_da_metadata_calc_last_lblock = lblock; | |
338 | return ext_depth(inode) + 1; | |
d2a17637 MC |
339 | } |
340 | ||
c29c0ae7 AT |
341 | static int |
342 | ext4_ext_max_entries(struct inode *inode, int depth) | |
343 | { | |
344 | int max; | |
345 | ||
346 | if (depth == ext_depth(inode)) { | |
347 | if (depth == 0) | |
55ad63bf | 348 | max = ext4_ext_space_root(inode, 1); |
c29c0ae7 | 349 | else |
55ad63bf | 350 | max = ext4_ext_space_root_idx(inode, 1); |
c29c0ae7 AT |
351 | } else { |
352 | if (depth == 0) | |
55ad63bf | 353 | max = ext4_ext_space_block(inode, 1); |
c29c0ae7 | 354 | else |
55ad63bf | 355 | max = ext4_ext_space_block_idx(inode, 1); |
c29c0ae7 AT |
356 | } |
357 | ||
358 | return max; | |
359 | } | |
360 | ||
56b19868 AK |
361 | static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext) |
362 | { | |
bf89d16f | 363 | ext4_fsblk_t block = ext4_ext_pblock(ext); |
56b19868 | 364 | int len = ext4_ext_get_actual_len(ext); |
e84a26ce | 365 | |
31d4f3a2 TT |
366 | if (len == 0) |
367 | return 0; | |
6fd058f7 | 368 | return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len); |
56b19868 AK |
369 | } |
370 | ||
371 | static int ext4_valid_extent_idx(struct inode *inode, | |
372 | struct ext4_extent_idx *ext_idx) | |
373 | { | |
bf89d16f | 374 | ext4_fsblk_t block = ext4_idx_pblock(ext_idx); |
e84a26ce | 375 | |
6fd058f7 | 376 | return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1); |
56b19868 AK |
377 | } |
378 | ||
379 | static int ext4_valid_extent_entries(struct inode *inode, | |
380 | struct ext4_extent_header *eh, | |
381 | int depth) | |
382 | { | |
56b19868 AK |
383 | unsigned short entries; |
384 | if (eh->eh_entries == 0) | |
385 | return 1; | |
386 | ||
387 | entries = le16_to_cpu(eh->eh_entries); | |
388 | ||
389 | if (depth == 0) { | |
390 | /* leaf entries */ | |
81fdbb4a | 391 | struct ext4_extent *ext = EXT_FIRST_EXTENT(eh); |
56b19868 AK |
392 | while (entries) { |
393 | if (!ext4_valid_extent(inode, ext)) | |
394 | return 0; | |
395 | ext++; | |
396 | entries--; | |
397 | } | |
398 | } else { | |
81fdbb4a | 399 | struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh); |
56b19868 AK |
400 | while (entries) { |
401 | if (!ext4_valid_extent_idx(inode, ext_idx)) | |
402 | return 0; | |
403 | ext_idx++; | |
404 | entries--; | |
405 | } | |
406 | } | |
407 | return 1; | |
408 | } | |
409 | ||
c398eda0 TT |
410 | static int __ext4_ext_check(const char *function, unsigned int line, |
411 | struct inode *inode, struct ext4_extent_header *eh, | |
412 | int depth) | |
c29c0ae7 AT |
413 | { |
414 | const char *error_msg; | |
415 | int max = 0; | |
416 | ||
417 | if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) { | |
418 | error_msg = "invalid magic"; | |
419 | goto corrupted; | |
420 | } | |
421 | if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) { | |
422 | error_msg = "unexpected eh_depth"; | |
423 | goto corrupted; | |
424 | } | |
425 | if (unlikely(eh->eh_max == 0)) { | |
426 | error_msg = "invalid eh_max"; | |
427 | goto corrupted; | |
428 | } | |
429 | max = ext4_ext_max_entries(inode, depth); | |
430 | if (unlikely(le16_to_cpu(eh->eh_max) > max)) { | |
431 | error_msg = "too large eh_max"; | |
432 | goto corrupted; | |
433 | } | |
434 | if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) { | |
435 | error_msg = "invalid eh_entries"; | |
436 | goto corrupted; | |
437 | } | |
56b19868 AK |
438 | if (!ext4_valid_extent_entries(inode, eh, depth)) { |
439 | error_msg = "invalid extent entries"; | |
440 | goto corrupted; | |
441 | } | |
7ac5990d DW |
442 | /* Verify checksum on non-root extent tree nodes */ |
443 | if (ext_depth(inode) != depth && | |
444 | !ext4_extent_block_csum_verify(inode, eh)) { | |
445 | error_msg = "extent tree corrupted"; | |
446 | goto corrupted; | |
447 | } | |
c29c0ae7 AT |
448 | return 0; |
449 | ||
450 | corrupted: | |
c398eda0 | 451 | ext4_error_inode(inode, function, line, 0, |
24676da4 | 452 | "bad header/extent: %s - magic %x, " |
c29c0ae7 | 453 | "entries %u, max %u(%u), depth %u(%u)", |
24676da4 | 454 | error_msg, le16_to_cpu(eh->eh_magic), |
c29c0ae7 AT |
455 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max), |
456 | max, le16_to_cpu(eh->eh_depth), depth); | |
457 | ||
458 | return -EIO; | |
459 | } | |
460 | ||
56b19868 | 461 | #define ext4_ext_check(inode, eh, depth) \ |
c398eda0 | 462 | __ext4_ext_check(__func__, __LINE__, inode, eh, depth) |
c29c0ae7 | 463 | |
7a262f7c AK |
464 | int ext4_ext_check_inode(struct inode *inode) |
465 | { | |
466 | return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode)); | |
467 | } | |
468 | ||
f8489128 DW |
469 | static int __ext4_ext_check_block(const char *function, unsigned int line, |
470 | struct inode *inode, | |
471 | struct ext4_extent_header *eh, | |
472 | int depth, | |
473 | struct buffer_head *bh) | |
474 | { | |
475 | int ret; | |
476 | ||
477 | if (buffer_verified(bh)) | |
478 | return 0; | |
479 | ret = ext4_ext_check(inode, eh, depth); | |
480 | if (ret) | |
481 | return ret; | |
482 | set_buffer_verified(bh); | |
483 | return ret; | |
484 | } | |
485 | ||
486 | #define ext4_ext_check_block(inode, eh, depth, bh) \ | |
487 | __ext4_ext_check_block(__func__, __LINE__, inode, eh, depth, bh) | |
488 | ||
a86c6181 AT |
489 | #ifdef EXT_DEBUG |
490 | static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path) | |
491 | { | |
492 | int k, l = path->p_depth; | |
493 | ||
494 | ext_debug("path:"); | |
495 | for (k = 0; k <= l; k++, path++) { | |
496 | if (path->p_idx) { | |
2ae02107 | 497 | ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block), |
bf89d16f | 498 | ext4_idx_pblock(path->p_idx)); |
a86c6181 | 499 | } else if (path->p_ext) { |
553f9008 | 500 | ext_debug(" %d:[%d]%d:%llu ", |
a86c6181 | 501 | le32_to_cpu(path->p_ext->ee_block), |
553f9008 | 502 | ext4_ext_is_uninitialized(path->p_ext), |
a2df2a63 | 503 | ext4_ext_get_actual_len(path->p_ext), |
bf89d16f | 504 | ext4_ext_pblock(path->p_ext)); |
a86c6181 AT |
505 | } else |
506 | ext_debug(" []"); | |
507 | } | |
508 | ext_debug("\n"); | |
509 | } | |
510 | ||
511 | static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path) | |
512 | { | |
513 | int depth = ext_depth(inode); | |
514 | struct ext4_extent_header *eh; | |
515 | struct ext4_extent *ex; | |
516 | int i; | |
517 | ||
518 | if (!path) | |
519 | return; | |
520 | ||
521 | eh = path[depth].p_hdr; | |
522 | ex = EXT_FIRST_EXTENT(eh); | |
523 | ||
553f9008 M |
524 | ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino); |
525 | ||
a86c6181 | 526 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) { |
553f9008 M |
527 | ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block), |
528 | ext4_ext_is_uninitialized(ex), | |
bf89d16f | 529 | ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex)); |
a86c6181 AT |
530 | } |
531 | ext_debug("\n"); | |
532 | } | |
1b16da77 YY |
533 | |
534 | static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path, | |
535 | ext4_fsblk_t newblock, int level) | |
536 | { | |
537 | int depth = ext_depth(inode); | |
538 | struct ext4_extent *ex; | |
539 | ||
540 | if (depth != level) { | |
541 | struct ext4_extent_idx *idx; | |
542 | idx = path[level].p_idx; | |
543 | while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) { | |
544 | ext_debug("%d: move %d:%llu in new index %llu\n", level, | |
545 | le32_to_cpu(idx->ei_block), | |
546 | ext4_idx_pblock(idx), | |
547 | newblock); | |
548 | idx++; | |
549 | } | |
550 | ||
551 | return; | |
552 | } | |
553 | ||
554 | ex = path[depth].p_ext; | |
555 | while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) { | |
556 | ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n", | |
557 | le32_to_cpu(ex->ee_block), | |
558 | ext4_ext_pblock(ex), | |
559 | ext4_ext_is_uninitialized(ex), | |
560 | ext4_ext_get_actual_len(ex), | |
561 | newblock); | |
562 | ex++; | |
563 | } | |
564 | } | |
565 | ||
a86c6181 | 566 | #else |
af5bc92d TT |
567 | #define ext4_ext_show_path(inode, path) |
568 | #define ext4_ext_show_leaf(inode, path) | |
1b16da77 | 569 | #define ext4_ext_show_move(inode, path, newblock, level) |
a86c6181 AT |
570 | #endif |
571 | ||
b35905c1 | 572 | void ext4_ext_drop_refs(struct ext4_ext_path *path) |
a86c6181 AT |
573 | { |
574 | int depth = path->p_depth; | |
575 | int i; | |
576 | ||
577 | for (i = 0; i <= depth; i++, path++) | |
578 | if (path->p_bh) { | |
579 | brelse(path->p_bh); | |
580 | path->p_bh = NULL; | |
581 | } | |
582 | } | |
583 | ||
584 | /* | |
d0d856e8 RD |
585 | * ext4_ext_binsearch_idx: |
586 | * binary search for the closest index of the given block | |
c29c0ae7 | 587 | * the header must be checked before calling this |
a86c6181 AT |
588 | */ |
589 | static void | |
725d26d3 AK |
590 | ext4_ext_binsearch_idx(struct inode *inode, |
591 | struct ext4_ext_path *path, ext4_lblk_t block) | |
a86c6181 AT |
592 | { |
593 | struct ext4_extent_header *eh = path->p_hdr; | |
594 | struct ext4_extent_idx *r, *l, *m; | |
595 | ||
a86c6181 | 596 | |
bba90743 | 597 | ext_debug("binsearch for %u(idx): ", block); |
a86c6181 AT |
598 | |
599 | l = EXT_FIRST_INDEX(eh) + 1; | |
e9f410b1 | 600 | r = EXT_LAST_INDEX(eh); |
a86c6181 AT |
601 | while (l <= r) { |
602 | m = l + (r - l) / 2; | |
603 | if (block < le32_to_cpu(m->ei_block)) | |
604 | r = m - 1; | |
605 | else | |
606 | l = m + 1; | |
26d535ed DM |
607 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block), |
608 | m, le32_to_cpu(m->ei_block), | |
609 | r, le32_to_cpu(r->ei_block)); | |
a86c6181 AT |
610 | } |
611 | ||
612 | path->p_idx = l - 1; | |
4a3c3a51 | 613 | ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block), |
bf89d16f | 614 | ext4_idx_pblock(path->p_idx)); |
a86c6181 AT |
615 | |
616 | #ifdef CHECK_BINSEARCH | |
617 | { | |
618 | struct ext4_extent_idx *chix, *ix; | |
619 | int k; | |
620 | ||
621 | chix = ix = EXT_FIRST_INDEX(eh); | |
622 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) { | |
623 | if (k != 0 && | |
624 | le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) { | |
4776004f TT |
625 | printk(KERN_DEBUG "k=%d, ix=0x%p, " |
626 | "first=0x%p\n", k, | |
627 | ix, EXT_FIRST_INDEX(eh)); | |
628 | printk(KERN_DEBUG "%u <= %u\n", | |
a86c6181 AT |
629 | le32_to_cpu(ix->ei_block), |
630 | le32_to_cpu(ix[-1].ei_block)); | |
631 | } | |
632 | BUG_ON(k && le32_to_cpu(ix->ei_block) | |
8c55e204 | 633 | <= le32_to_cpu(ix[-1].ei_block)); |
a86c6181 AT |
634 | if (block < le32_to_cpu(ix->ei_block)) |
635 | break; | |
636 | chix = ix; | |
637 | } | |
638 | BUG_ON(chix != path->p_idx); | |
639 | } | |
640 | #endif | |
641 | ||
642 | } | |
643 | ||
644 | /* | |
d0d856e8 RD |
645 | * ext4_ext_binsearch: |
646 | * binary search for closest extent of the given block | |
c29c0ae7 | 647 | * the header must be checked before calling this |
a86c6181 AT |
648 | */ |
649 | static void | |
725d26d3 AK |
650 | ext4_ext_binsearch(struct inode *inode, |
651 | struct ext4_ext_path *path, ext4_lblk_t block) | |
a86c6181 AT |
652 | { |
653 | struct ext4_extent_header *eh = path->p_hdr; | |
654 | struct ext4_extent *r, *l, *m; | |
655 | ||
a86c6181 AT |
656 | if (eh->eh_entries == 0) { |
657 | /* | |
d0d856e8 RD |
658 | * this leaf is empty: |
659 | * we get such a leaf in split/add case | |
a86c6181 AT |
660 | */ |
661 | return; | |
662 | } | |
663 | ||
bba90743 | 664 | ext_debug("binsearch for %u: ", block); |
a86c6181 AT |
665 | |
666 | l = EXT_FIRST_EXTENT(eh) + 1; | |
e9f410b1 | 667 | r = EXT_LAST_EXTENT(eh); |
a86c6181 AT |
668 | |
669 | while (l <= r) { | |
670 | m = l + (r - l) / 2; | |
671 | if (block < le32_to_cpu(m->ee_block)) | |
672 | r = m - 1; | |
673 | else | |
674 | l = m + 1; | |
26d535ed DM |
675 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block), |
676 | m, le32_to_cpu(m->ee_block), | |
677 | r, le32_to_cpu(r->ee_block)); | |
a86c6181 AT |
678 | } |
679 | ||
680 | path->p_ext = l - 1; | |
553f9008 | 681 | ext_debug(" -> %d:%llu:[%d]%d ", |
8c55e204 | 682 | le32_to_cpu(path->p_ext->ee_block), |
bf89d16f | 683 | ext4_ext_pblock(path->p_ext), |
553f9008 | 684 | ext4_ext_is_uninitialized(path->p_ext), |
a2df2a63 | 685 | ext4_ext_get_actual_len(path->p_ext)); |
a86c6181 AT |
686 | |
687 | #ifdef CHECK_BINSEARCH | |
688 | { | |
689 | struct ext4_extent *chex, *ex; | |
690 | int k; | |
691 | ||
692 | chex = ex = EXT_FIRST_EXTENT(eh); | |
693 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) { | |
694 | BUG_ON(k && le32_to_cpu(ex->ee_block) | |
8c55e204 | 695 | <= le32_to_cpu(ex[-1].ee_block)); |
a86c6181 AT |
696 | if (block < le32_to_cpu(ex->ee_block)) |
697 | break; | |
698 | chex = ex; | |
699 | } | |
700 | BUG_ON(chex != path->p_ext); | |
701 | } | |
702 | #endif | |
703 | ||
704 | } | |
705 | ||
706 | int ext4_ext_tree_init(handle_t *handle, struct inode *inode) | |
707 | { | |
708 | struct ext4_extent_header *eh; | |
709 | ||
710 | eh = ext_inode_hdr(inode); | |
711 | eh->eh_depth = 0; | |
712 | eh->eh_entries = 0; | |
713 | eh->eh_magic = EXT4_EXT_MAGIC; | |
55ad63bf | 714 | eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0)); |
a86c6181 AT |
715 | ext4_mark_inode_dirty(handle, inode); |
716 | ext4_ext_invalidate_cache(inode); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | struct ext4_ext_path * | |
725d26d3 AK |
721 | ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, |
722 | struct ext4_ext_path *path) | |
a86c6181 AT |
723 | { |
724 | struct ext4_extent_header *eh; | |
725 | struct buffer_head *bh; | |
726 | short int depth, i, ppos = 0, alloc = 0; | |
727 | ||
728 | eh = ext_inode_hdr(inode); | |
c29c0ae7 | 729 | depth = ext_depth(inode); |
a86c6181 AT |
730 | |
731 | /* account possible depth increase */ | |
732 | if (!path) { | |
5d4958f9 | 733 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2), |
a86c6181 AT |
734 | GFP_NOFS); |
735 | if (!path) | |
736 | return ERR_PTR(-ENOMEM); | |
737 | alloc = 1; | |
738 | } | |
a86c6181 | 739 | path[0].p_hdr = eh; |
1973adcb | 740 | path[0].p_bh = NULL; |
a86c6181 | 741 | |
c29c0ae7 | 742 | i = depth; |
a86c6181 AT |
743 | /* walk through the tree */ |
744 | while (i) { | |
745 | ext_debug("depth %d: num %d, max %d\n", | |
746 | ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); | |
c29c0ae7 | 747 | |
a86c6181 | 748 | ext4_ext_binsearch_idx(inode, path + ppos, block); |
bf89d16f | 749 | path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); |
a86c6181 AT |
750 | path[ppos].p_depth = i; |
751 | path[ppos].p_ext = NULL; | |
752 | ||
7a262f7c AK |
753 | bh = sb_getblk(inode->i_sb, path[ppos].p_block); |
754 | if (unlikely(!bh)) | |
a86c6181 | 755 | goto err; |
7a262f7c | 756 | if (!bh_uptodate_or_lock(bh)) { |
0562e0ba JZ |
757 | trace_ext4_ext_load_extent(inode, block, |
758 | path[ppos].p_block); | |
7a262f7c AK |
759 | if (bh_submit_read(bh) < 0) { |
760 | put_bh(bh); | |
761 | goto err; | |
762 | } | |
7a262f7c | 763 | } |
a86c6181 AT |
764 | eh = ext_block_hdr(bh); |
765 | ppos++; | |
273df556 FM |
766 | if (unlikely(ppos > depth)) { |
767 | put_bh(bh); | |
768 | EXT4_ERROR_INODE(inode, | |
769 | "ppos %d > depth %d", ppos, depth); | |
770 | goto err; | |
771 | } | |
a86c6181 AT |
772 | path[ppos].p_bh = bh; |
773 | path[ppos].p_hdr = eh; | |
774 | i--; | |
775 | ||
f8489128 | 776 | if (ext4_ext_check_block(inode, eh, i, bh)) |
a86c6181 AT |
777 | goto err; |
778 | } | |
779 | ||
780 | path[ppos].p_depth = i; | |
a86c6181 AT |
781 | path[ppos].p_ext = NULL; |
782 | path[ppos].p_idx = NULL; | |
783 | ||
a86c6181 AT |
784 | /* find extent */ |
785 | ext4_ext_binsearch(inode, path + ppos, block); | |
1973adcb SF |
786 | /* if not an empty leaf */ |
787 | if (path[ppos].p_ext) | |
bf89d16f | 788 | path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); |
a86c6181 AT |
789 | |
790 | ext4_ext_show_path(inode, path); | |
791 | ||
792 | return path; | |
793 | ||
794 | err: | |
795 | ext4_ext_drop_refs(path); | |
796 | if (alloc) | |
797 | kfree(path); | |
798 | return ERR_PTR(-EIO); | |
799 | } | |
800 | ||
801 | /* | |
d0d856e8 RD |
802 | * ext4_ext_insert_index: |
803 | * insert new index [@logical;@ptr] into the block at @curp; | |
804 | * check where to insert: before @curp or after @curp | |
a86c6181 | 805 | */ |
1f109d5a TT |
806 | static int ext4_ext_insert_index(handle_t *handle, struct inode *inode, |
807 | struct ext4_ext_path *curp, | |
808 | int logical, ext4_fsblk_t ptr) | |
a86c6181 AT |
809 | { |
810 | struct ext4_extent_idx *ix; | |
811 | int len, err; | |
812 | ||
7e028976 AM |
813 | err = ext4_ext_get_access(handle, inode, curp); |
814 | if (err) | |
a86c6181 AT |
815 | return err; |
816 | ||
273df556 FM |
817 | if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) { |
818 | EXT4_ERROR_INODE(inode, | |
819 | "logical %d == ei_block %d!", | |
820 | logical, le32_to_cpu(curp->p_idx->ei_block)); | |
821 | return -EIO; | |
822 | } | |
d4620315 RD |
823 | |
824 | if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries) | |
825 | >= le16_to_cpu(curp->p_hdr->eh_max))) { | |
826 | EXT4_ERROR_INODE(inode, | |
827 | "eh_entries %d >= eh_max %d!", | |
828 | le16_to_cpu(curp->p_hdr->eh_entries), | |
829 | le16_to_cpu(curp->p_hdr->eh_max)); | |
830 | return -EIO; | |
831 | } | |
832 | ||
a86c6181 AT |
833 | if (logical > le32_to_cpu(curp->p_idx->ei_block)) { |
834 | /* insert after */ | |
80e675f9 | 835 | ext_debug("insert new index %d after: %llu\n", logical, ptr); |
a86c6181 AT |
836 | ix = curp->p_idx + 1; |
837 | } else { | |
838 | /* insert before */ | |
80e675f9 | 839 | ext_debug("insert new index %d before: %llu\n", logical, ptr); |
a86c6181 AT |
840 | ix = curp->p_idx; |
841 | } | |
842 | ||
80e675f9 EG |
843 | len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1; |
844 | BUG_ON(len < 0); | |
845 | if (len > 0) { | |
846 | ext_debug("insert new index %d: " | |
847 | "move %d indices from 0x%p to 0x%p\n", | |
848 | logical, len, ix, ix + 1); | |
849 | memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx)); | |
850 | } | |
851 | ||
f472e026 TM |
852 | if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) { |
853 | EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!"); | |
854 | return -EIO; | |
855 | } | |
856 | ||
a86c6181 | 857 | ix->ei_block = cpu_to_le32(logical); |
f65e6fba | 858 | ext4_idx_store_pblock(ix, ptr); |
e8546d06 | 859 | le16_add_cpu(&curp->p_hdr->eh_entries, 1); |
a86c6181 | 860 | |
273df556 FM |
861 | if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) { |
862 | EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!"); | |
863 | return -EIO; | |
864 | } | |
a86c6181 AT |
865 | |
866 | err = ext4_ext_dirty(handle, inode, curp); | |
867 | ext4_std_error(inode->i_sb, err); | |
868 | ||
869 | return err; | |
870 | } | |
871 | ||
872 | /* | |
d0d856e8 RD |
873 | * ext4_ext_split: |
874 | * inserts new subtree into the path, using free index entry | |
875 | * at depth @at: | |
876 | * - allocates all needed blocks (new leaf and all intermediate index blocks) | |
877 | * - makes decision where to split | |
878 | * - moves remaining extents and index entries (right to the split point) | |
879 | * into the newly allocated blocks | |
880 | * - initializes subtree | |
a86c6181 AT |
881 | */ |
882 | static int ext4_ext_split(handle_t *handle, struct inode *inode, | |
55f020db AH |
883 | unsigned int flags, |
884 | struct ext4_ext_path *path, | |
885 | struct ext4_extent *newext, int at) | |
a86c6181 AT |
886 | { |
887 | struct buffer_head *bh = NULL; | |
888 | int depth = ext_depth(inode); | |
889 | struct ext4_extent_header *neh; | |
890 | struct ext4_extent_idx *fidx; | |
a86c6181 | 891 | int i = at, k, m, a; |
f65e6fba | 892 | ext4_fsblk_t newblock, oldblock; |
a86c6181 | 893 | __le32 border; |
f65e6fba | 894 | ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */ |
a86c6181 AT |
895 | int err = 0; |
896 | ||
897 | /* make decision: where to split? */ | |
d0d856e8 | 898 | /* FIXME: now decision is simplest: at current extent */ |
a86c6181 | 899 | |
d0d856e8 | 900 | /* if current leaf will be split, then we should use |
a86c6181 | 901 | * border from split point */ |
273df556 FM |
902 | if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) { |
903 | EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!"); | |
904 | return -EIO; | |
905 | } | |
a86c6181 AT |
906 | if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) { |
907 | border = path[depth].p_ext[1].ee_block; | |
d0d856e8 | 908 | ext_debug("leaf will be split." |
a86c6181 | 909 | " next leaf starts at %d\n", |
8c55e204 | 910 | le32_to_cpu(border)); |
a86c6181 AT |
911 | } else { |
912 | border = newext->ee_block; | |
913 | ext_debug("leaf will be added." | |
914 | " next leaf starts at %d\n", | |
8c55e204 | 915 | le32_to_cpu(border)); |
a86c6181 AT |
916 | } |
917 | ||
918 | /* | |
d0d856e8 RD |
919 | * If error occurs, then we break processing |
920 | * and mark filesystem read-only. index won't | |
a86c6181 | 921 | * be inserted and tree will be in consistent |
d0d856e8 | 922 | * state. Next mount will repair buffers too. |
a86c6181 AT |
923 | */ |
924 | ||
925 | /* | |
d0d856e8 RD |
926 | * Get array to track all allocated blocks. |
927 | * We need this to handle errors and free blocks | |
928 | * upon them. | |
a86c6181 | 929 | */ |
5d4958f9 | 930 | ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS); |
a86c6181 AT |
931 | if (!ablocks) |
932 | return -ENOMEM; | |
a86c6181 AT |
933 | |
934 | /* allocate all needed blocks */ | |
935 | ext_debug("allocate %d blocks for indexes/leaf\n", depth - at); | |
936 | for (a = 0; a < depth - at; a++) { | |
654b4908 | 937 | newblock = ext4_ext_new_meta_block(handle, inode, path, |
55f020db | 938 | newext, &err, flags); |
a86c6181 AT |
939 | if (newblock == 0) |
940 | goto cleanup; | |
941 | ablocks[a] = newblock; | |
942 | } | |
943 | ||
944 | /* initialize new leaf */ | |
945 | newblock = ablocks[--a]; | |
273df556 FM |
946 | if (unlikely(newblock == 0)) { |
947 | EXT4_ERROR_INODE(inode, "newblock == 0!"); | |
948 | err = -EIO; | |
949 | goto cleanup; | |
950 | } | |
a86c6181 AT |
951 | bh = sb_getblk(inode->i_sb, newblock); |
952 | if (!bh) { | |
953 | err = -EIO; | |
954 | goto cleanup; | |
955 | } | |
956 | lock_buffer(bh); | |
957 | ||
7e028976 AM |
958 | err = ext4_journal_get_create_access(handle, bh); |
959 | if (err) | |
a86c6181 AT |
960 | goto cleanup; |
961 | ||
962 | neh = ext_block_hdr(bh); | |
963 | neh->eh_entries = 0; | |
55ad63bf | 964 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
a86c6181 AT |
965 | neh->eh_magic = EXT4_EXT_MAGIC; |
966 | neh->eh_depth = 0; | |
a86c6181 | 967 | |
d0d856e8 | 968 | /* move remainder of path[depth] to the new leaf */ |
273df556 FM |
969 | if (unlikely(path[depth].p_hdr->eh_entries != |
970 | path[depth].p_hdr->eh_max)) { | |
971 | EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!", | |
972 | path[depth].p_hdr->eh_entries, | |
973 | path[depth].p_hdr->eh_max); | |
974 | err = -EIO; | |
975 | goto cleanup; | |
976 | } | |
a86c6181 | 977 | /* start copy from next extent */ |
1b16da77 YY |
978 | m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++; |
979 | ext4_ext_show_move(inode, path, newblock, depth); | |
a86c6181 | 980 | if (m) { |
1b16da77 YY |
981 | struct ext4_extent *ex; |
982 | ex = EXT_FIRST_EXTENT(neh); | |
983 | memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m); | |
e8546d06 | 984 | le16_add_cpu(&neh->eh_entries, m); |
a86c6181 AT |
985 | } |
986 | ||
7ac5990d | 987 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
988 | set_buffer_uptodate(bh); |
989 | unlock_buffer(bh); | |
990 | ||
0390131b | 991 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 992 | if (err) |
a86c6181 AT |
993 | goto cleanup; |
994 | brelse(bh); | |
995 | bh = NULL; | |
996 | ||
997 | /* correct old leaf */ | |
998 | if (m) { | |
7e028976 AM |
999 | err = ext4_ext_get_access(handle, inode, path + depth); |
1000 | if (err) | |
a86c6181 | 1001 | goto cleanup; |
e8546d06 | 1002 | le16_add_cpu(&path[depth].p_hdr->eh_entries, -m); |
7e028976 AM |
1003 | err = ext4_ext_dirty(handle, inode, path + depth); |
1004 | if (err) | |
a86c6181 AT |
1005 | goto cleanup; |
1006 | ||
1007 | } | |
1008 | ||
1009 | /* create intermediate indexes */ | |
1010 | k = depth - at - 1; | |
273df556 FM |
1011 | if (unlikely(k < 0)) { |
1012 | EXT4_ERROR_INODE(inode, "k %d < 0!", k); | |
1013 | err = -EIO; | |
1014 | goto cleanup; | |
1015 | } | |
a86c6181 AT |
1016 | if (k) |
1017 | ext_debug("create %d intermediate indices\n", k); | |
1018 | /* insert new index into current index block */ | |
1019 | /* current depth stored in i var */ | |
1020 | i = depth - 1; | |
1021 | while (k--) { | |
1022 | oldblock = newblock; | |
1023 | newblock = ablocks[--a]; | |
bba90743 | 1024 | bh = sb_getblk(inode->i_sb, newblock); |
a86c6181 AT |
1025 | if (!bh) { |
1026 | err = -EIO; | |
1027 | goto cleanup; | |
1028 | } | |
1029 | lock_buffer(bh); | |
1030 | ||
7e028976 AM |
1031 | err = ext4_journal_get_create_access(handle, bh); |
1032 | if (err) | |
a86c6181 AT |
1033 | goto cleanup; |
1034 | ||
1035 | neh = ext_block_hdr(bh); | |
1036 | neh->eh_entries = cpu_to_le16(1); | |
1037 | neh->eh_magic = EXT4_EXT_MAGIC; | |
55ad63bf | 1038 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
a86c6181 AT |
1039 | neh->eh_depth = cpu_to_le16(depth - i); |
1040 | fidx = EXT_FIRST_INDEX(neh); | |
1041 | fidx->ei_block = border; | |
f65e6fba | 1042 | ext4_idx_store_pblock(fidx, oldblock); |
a86c6181 | 1043 | |
bba90743 ES |
1044 | ext_debug("int.index at %d (block %llu): %u -> %llu\n", |
1045 | i, newblock, le32_to_cpu(border), oldblock); | |
a86c6181 | 1046 | |
1b16da77 | 1047 | /* move remainder of path[i] to the new index block */ |
273df556 FM |
1048 | if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) != |
1049 | EXT_LAST_INDEX(path[i].p_hdr))) { | |
1050 | EXT4_ERROR_INODE(inode, | |
1051 | "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!", | |
1052 | le32_to_cpu(path[i].p_ext->ee_block)); | |
1053 | err = -EIO; | |
1054 | goto cleanup; | |
1055 | } | |
1b16da77 YY |
1056 | /* start copy indexes */ |
1057 | m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++; | |
1058 | ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx, | |
1059 | EXT_MAX_INDEX(path[i].p_hdr)); | |
1060 | ext4_ext_show_move(inode, path, newblock, i); | |
a86c6181 | 1061 | if (m) { |
1b16da77 | 1062 | memmove(++fidx, path[i].p_idx, |
a86c6181 | 1063 | sizeof(struct ext4_extent_idx) * m); |
e8546d06 | 1064 | le16_add_cpu(&neh->eh_entries, m); |
a86c6181 | 1065 | } |
7ac5990d | 1066 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
1067 | set_buffer_uptodate(bh); |
1068 | unlock_buffer(bh); | |
1069 | ||
0390131b | 1070 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 1071 | if (err) |
a86c6181 AT |
1072 | goto cleanup; |
1073 | brelse(bh); | |
1074 | bh = NULL; | |
1075 | ||
1076 | /* correct old index */ | |
1077 | if (m) { | |
1078 | err = ext4_ext_get_access(handle, inode, path + i); | |
1079 | if (err) | |
1080 | goto cleanup; | |
e8546d06 | 1081 | le16_add_cpu(&path[i].p_hdr->eh_entries, -m); |
a86c6181 AT |
1082 | err = ext4_ext_dirty(handle, inode, path + i); |
1083 | if (err) | |
1084 | goto cleanup; | |
1085 | } | |
1086 | ||
1087 | i--; | |
1088 | } | |
1089 | ||
1090 | /* insert new index */ | |
a86c6181 AT |
1091 | err = ext4_ext_insert_index(handle, inode, path + at, |
1092 | le32_to_cpu(border), newblock); | |
1093 | ||
1094 | cleanup: | |
1095 | if (bh) { | |
1096 | if (buffer_locked(bh)) | |
1097 | unlock_buffer(bh); | |
1098 | brelse(bh); | |
1099 | } | |
1100 | ||
1101 | if (err) { | |
1102 | /* free all allocated blocks in error case */ | |
1103 | for (i = 0; i < depth; i++) { | |
1104 | if (!ablocks[i]) | |
1105 | continue; | |
7dc57615 | 1106 | ext4_free_blocks(handle, inode, NULL, ablocks[i], 1, |
e6362609 | 1107 | EXT4_FREE_BLOCKS_METADATA); |
a86c6181 AT |
1108 | } |
1109 | } | |
1110 | kfree(ablocks); | |
1111 | ||
1112 | return err; | |
1113 | } | |
1114 | ||
1115 | /* | |
d0d856e8 RD |
1116 | * ext4_ext_grow_indepth: |
1117 | * implements tree growing procedure: | |
1118 | * - allocates new block | |
1119 | * - moves top-level data (index block or leaf) into the new block | |
1120 | * - initializes new top-level, creating index that points to the | |
1121 | * just created block | |
a86c6181 AT |
1122 | */ |
1123 | static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, | |
55f020db | 1124 | unsigned int flags, |
55f020db | 1125 | struct ext4_extent *newext) |
a86c6181 | 1126 | { |
a86c6181 | 1127 | struct ext4_extent_header *neh; |
a86c6181 | 1128 | struct buffer_head *bh; |
f65e6fba | 1129 | ext4_fsblk_t newblock; |
a86c6181 AT |
1130 | int err = 0; |
1131 | ||
1939dd84 | 1132 | newblock = ext4_ext_new_meta_block(handle, inode, NULL, |
55f020db | 1133 | newext, &err, flags); |
a86c6181 AT |
1134 | if (newblock == 0) |
1135 | return err; | |
1136 | ||
1137 | bh = sb_getblk(inode->i_sb, newblock); | |
1138 | if (!bh) { | |
1139 | err = -EIO; | |
1140 | ext4_std_error(inode->i_sb, err); | |
1141 | return err; | |
1142 | } | |
1143 | lock_buffer(bh); | |
1144 | ||
7e028976 AM |
1145 | err = ext4_journal_get_create_access(handle, bh); |
1146 | if (err) { | |
a86c6181 AT |
1147 | unlock_buffer(bh); |
1148 | goto out; | |
1149 | } | |
1150 | ||
1151 | /* move top-level index/leaf into new block */ | |
1939dd84 DM |
1152 | memmove(bh->b_data, EXT4_I(inode)->i_data, |
1153 | sizeof(EXT4_I(inode)->i_data)); | |
a86c6181 AT |
1154 | |
1155 | /* set size of new block */ | |
1156 | neh = ext_block_hdr(bh); | |
1157 | /* old root could have indexes or leaves | |
1158 | * so calculate e_max right way */ | |
1159 | if (ext_depth(inode)) | |
55ad63bf | 1160 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
a86c6181 | 1161 | else |
55ad63bf | 1162 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
a86c6181 | 1163 | neh->eh_magic = EXT4_EXT_MAGIC; |
7ac5990d | 1164 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
1165 | set_buffer_uptodate(bh); |
1166 | unlock_buffer(bh); | |
1167 | ||
0390131b | 1168 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 1169 | if (err) |
a86c6181 AT |
1170 | goto out; |
1171 | ||
1939dd84 | 1172 | /* Update top-level index: num,max,pointer */ |
a86c6181 | 1173 | neh = ext_inode_hdr(inode); |
1939dd84 DM |
1174 | neh->eh_entries = cpu_to_le16(1); |
1175 | ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock); | |
1176 | if (neh->eh_depth == 0) { | |
1177 | /* Root extent block becomes index block */ | |
1178 | neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0)); | |
1179 | EXT_FIRST_INDEX(neh)->ei_block = | |
1180 | EXT_FIRST_EXTENT(neh)->ee_block; | |
1181 | } | |
2ae02107 | 1182 | ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n", |
a86c6181 | 1183 | le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max), |
5a0790c2 | 1184 | le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block), |
bf89d16f | 1185 | ext4_idx_pblock(EXT_FIRST_INDEX(neh))); |
a86c6181 | 1186 | |
ba39ebb6 | 1187 | le16_add_cpu(&neh->eh_depth, 1); |
1939dd84 | 1188 | ext4_mark_inode_dirty(handle, inode); |
a86c6181 AT |
1189 | out: |
1190 | brelse(bh); | |
1191 | ||
1192 | return err; | |
1193 | } | |
1194 | ||
1195 | /* | |
d0d856e8 RD |
1196 | * ext4_ext_create_new_leaf: |
1197 | * finds empty index and adds new leaf. | |
1198 | * if no free index is found, then it requests in-depth growing. | |
a86c6181 AT |
1199 | */ |
1200 | static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode, | |
55f020db AH |
1201 | unsigned int flags, |
1202 | struct ext4_ext_path *path, | |
1203 | struct ext4_extent *newext) | |
a86c6181 AT |
1204 | { |
1205 | struct ext4_ext_path *curp; | |
1206 | int depth, i, err = 0; | |
1207 | ||
1208 | repeat: | |
1209 | i = depth = ext_depth(inode); | |
1210 | ||
1211 | /* walk up to the tree and look for free index entry */ | |
1212 | curp = path + depth; | |
1213 | while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) { | |
1214 | i--; | |
1215 | curp--; | |
1216 | } | |
1217 | ||
d0d856e8 RD |
1218 | /* we use already allocated block for index block, |
1219 | * so subsequent data blocks should be contiguous */ | |
a86c6181 AT |
1220 | if (EXT_HAS_FREE_INDEX(curp)) { |
1221 | /* if we found index with free entry, then use that | |
1222 | * entry: create all needed subtree and add new leaf */ | |
55f020db | 1223 | err = ext4_ext_split(handle, inode, flags, path, newext, i); |
787e0981 SF |
1224 | if (err) |
1225 | goto out; | |
a86c6181 AT |
1226 | |
1227 | /* refill path */ | |
1228 | ext4_ext_drop_refs(path); | |
1229 | path = ext4_ext_find_extent(inode, | |
725d26d3 AK |
1230 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
1231 | path); | |
a86c6181 AT |
1232 | if (IS_ERR(path)) |
1233 | err = PTR_ERR(path); | |
1234 | } else { | |
1235 | /* tree is full, time to grow in depth */ | |
1939dd84 | 1236 | err = ext4_ext_grow_indepth(handle, inode, flags, newext); |
a86c6181 AT |
1237 | if (err) |
1238 | goto out; | |
1239 | ||
1240 | /* refill path */ | |
1241 | ext4_ext_drop_refs(path); | |
1242 | path = ext4_ext_find_extent(inode, | |
725d26d3 AK |
1243 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
1244 | path); | |
a86c6181 AT |
1245 | if (IS_ERR(path)) { |
1246 | err = PTR_ERR(path); | |
1247 | goto out; | |
1248 | } | |
1249 | ||
1250 | /* | |
d0d856e8 RD |
1251 | * only first (depth 0 -> 1) produces free space; |
1252 | * in all other cases we have to split the grown tree | |
a86c6181 AT |
1253 | */ |
1254 | depth = ext_depth(inode); | |
1255 | if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) { | |
d0d856e8 | 1256 | /* now we need to split */ |
a86c6181 AT |
1257 | goto repeat; |
1258 | } | |
1259 | } | |
1260 | ||
1261 | out: | |
1262 | return err; | |
1263 | } | |
1264 | ||
1988b51e AT |
1265 | /* |
1266 | * search the closest allocated block to the left for *logical | |
1267 | * and returns it at @logical + it's physical address at @phys | |
1268 | * if *logical is the smallest allocated block, the function | |
1269 | * returns 0 at @phys | |
1270 | * return value contains 0 (success) or error code | |
1271 | */ | |
1f109d5a TT |
1272 | static int ext4_ext_search_left(struct inode *inode, |
1273 | struct ext4_ext_path *path, | |
1274 | ext4_lblk_t *logical, ext4_fsblk_t *phys) | |
1988b51e AT |
1275 | { |
1276 | struct ext4_extent_idx *ix; | |
1277 | struct ext4_extent *ex; | |
b939e376 | 1278 | int depth, ee_len; |
1988b51e | 1279 | |
273df556 FM |
1280 | if (unlikely(path == NULL)) { |
1281 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); | |
1282 | return -EIO; | |
1283 | } | |
1988b51e AT |
1284 | depth = path->p_depth; |
1285 | *phys = 0; | |
1286 | ||
1287 | if (depth == 0 && path->p_ext == NULL) | |
1288 | return 0; | |
1289 | ||
1290 | /* usually extent in the path covers blocks smaller | |
1291 | * then *logical, but it can be that extent is the | |
1292 | * first one in the file */ | |
1293 | ||
1294 | ex = path[depth].p_ext; | |
b939e376 | 1295 | ee_len = ext4_ext_get_actual_len(ex); |
1988b51e | 1296 | if (*logical < le32_to_cpu(ex->ee_block)) { |
273df556 FM |
1297 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
1298 | EXT4_ERROR_INODE(inode, | |
1299 | "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!", | |
1300 | *logical, le32_to_cpu(ex->ee_block)); | |
1301 | return -EIO; | |
1302 | } | |
1988b51e AT |
1303 | while (--depth >= 0) { |
1304 | ix = path[depth].p_idx; | |
273df556 FM |
1305 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
1306 | EXT4_ERROR_INODE(inode, | |
1307 | "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!", | |
6ee3b212 | 1308 | ix != NULL ? le32_to_cpu(ix->ei_block) : 0, |
273df556 | 1309 | EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ? |
6ee3b212 | 1310 | le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0, |
273df556 FM |
1311 | depth); |
1312 | return -EIO; | |
1313 | } | |
1988b51e AT |
1314 | } |
1315 | return 0; | |
1316 | } | |
1317 | ||
273df556 FM |
1318 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
1319 | EXT4_ERROR_INODE(inode, | |
1320 | "logical %d < ee_block %d + ee_len %d!", | |
1321 | *logical, le32_to_cpu(ex->ee_block), ee_len); | |
1322 | return -EIO; | |
1323 | } | |
1988b51e | 1324 | |
b939e376 | 1325 | *logical = le32_to_cpu(ex->ee_block) + ee_len - 1; |
bf89d16f | 1326 | *phys = ext4_ext_pblock(ex) + ee_len - 1; |
1988b51e AT |
1327 | return 0; |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * search the closest allocated block to the right for *logical | |
1332 | * and returns it at @logical + it's physical address at @phys | |
df3ab170 | 1333 | * if *logical is the largest allocated block, the function |
1988b51e AT |
1334 | * returns 0 at @phys |
1335 | * return value contains 0 (success) or error code | |
1336 | */ | |
1f109d5a TT |
1337 | static int ext4_ext_search_right(struct inode *inode, |
1338 | struct ext4_ext_path *path, | |
4d33b1ef TT |
1339 | ext4_lblk_t *logical, ext4_fsblk_t *phys, |
1340 | struct ext4_extent **ret_ex) | |
1988b51e AT |
1341 | { |
1342 | struct buffer_head *bh = NULL; | |
1343 | struct ext4_extent_header *eh; | |
1344 | struct ext4_extent_idx *ix; | |
1345 | struct ext4_extent *ex; | |
1346 | ext4_fsblk_t block; | |
395a87bf ES |
1347 | int depth; /* Note, NOT eh_depth; depth from top of tree */ |
1348 | int ee_len; | |
1988b51e | 1349 | |
273df556 FM |
1350 | if (unlikely(path == NULL)) { |
1351 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); | |
1352 | return -EIO; | |
1353 | } | |
1988b51e AT |
1354 | depth = path->p_depth; |
1355 | *phys = 0; | |
1356 | ||
1357 | if (depth == 0 && path->p_ext == NULL) | |
1358 | return 0; | |
1359 | ||
1360 | /* usually extent in the path covers blocks smaller | |
1361 | * then *logical, but it can be that extent is the | |
1362 | * first one in the file */ | |
1363 | ||
1364 | ex = path[depth].p_ext; | |
b939e376 | 1365 | ee_len = ext4_ext_get_actual_len(ex); |
1988b51e | 1366 | if (*logical < le32_to_cpu(ex->ee_block)) { |
273df556 FM |
1367 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
1368 | EXT4_ERROR_INODE(inode, | |
1369 | "first_extent(path[%d].p_hdr) != ex", | |
1370 | depth); | |
1371 | return -EIO; | |
1372 | } | |
1988b51e AT |
1373 | while (--depth >= 0) { |
1374 | ix = path[depth].p_idx; | |
273df556 FM |
1375 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
1376 | EXT4_ERROR_INODE(inode, | |
1377 | "ix != EXT_FIRST_INDEX *logical %d!", | |
1378 | *logical); | |
1379 | return -EIO; | |
1380 | } | |
1988b51e | 1381 | } |
4d33b1ef | 1382 | goto found_extent; |
1988b51e AT |
1383 | } |
1384 | ||
273df556 FM |
1385 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
1386 | EXT4_ERROR_INODE(inode, | |
1387 | "logical %d < ee_block %d + ee_len %d!", | |
1388 | *logical, le32_to_cpu(ex->ee_block), ee_len); | |
1389 | return -EIO; | |
1390 | } | |
1988b51e AT |
1391 | |
1392 | if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) { | |
1393 | /* next allocated block in this leaf */ | |
1394 | ex++; | |
4d33b1ef | 1395 | goto found_extent; |
1988b51e AT |
1396 | } |
1397 | ||
1398 | /* go up and search for index to the right */ | |
1399 | while (--depth >= 0) { | |
1400 | ix = path[depth].p_idx; | |
1401 | if (ix != EXT_LAST_INDEX(path[depth].p_hdr)) | |
25f1ee3a | 1402 | goto got_index; |
1988b51e AT |
1403 | } |
1404 | ||
25f1ee3a WF |
1405 | /* we've gone up to the root and found no index to the right */ |
1406 | return 0; | |
1988b51e | 1407 | |
25f1ee3a | 1408 | got_index: |
1988b51e AT |
1409 | /* we've found index to the right, let's |
1410 | * follow it and find the closest allocated | |
1411 | * block to the right */ | |
1412 | ix++; | |
bf89d16f | 1413 | block = ext4_idx_pblock(ix); |
1988b51e AT |
1414 | while (++depth < path->p_depth) { |
1415 | bh = sb_bread(inode->i_sb, block); | |
1416 | if (bh == NULL) | |
1417 | return -EIO; | |
1418 | eh = ext_block_hdr(bh); | |
395a87bf | 1419 | /* subtract from p_depth to get proper eh_depth */ |
f8489128 DW |
1420 | if (ext4_ext_check_block(inode, eh, |
1421 | path->p_depth - depth, bh)) { | |
1988b51e AT |
1422 | put_bh(bh); |
1423 | return -EIO; | |
1424 | } | |
1425 | ix = EXT_FIRST_INDEX(eh); | |
bf89d16f | 1426 | block = ext4_idx_pblock(ix); |
1988b51e AT |
1427 | put_bh(bh); |
1428 | } | |
1429 | ||
1430 | bh = sb_bread(inode->i_sb, block); | |
1431 | if (bh == NULL) | |
1432 | return -EIO; | |
1433 | eh = ext_block_hdr(bh); | |
f8489128 | 1434 | if (ext4_ext_check_block(inode, eh, path->p_depth - depth, bh)) { |
1988b51e AT |
1435 | put_bh(bh); |
1436 | return -EIO; | |
1437 | } | |
1438 | ex = EXT_FIRST_EXTENT(eh); | |
4d33b1ef | 1439 | found_extent: |
1988b51e | 1440 | *logical = le32_to_cpu(ex->ee_block); |
bf89d16f | 1441 | *phys = ext4_ext_pblock(ex); |
4d33b1ef TT |
1442 | *ret_ex = ex; |
1443 | if (bh) | |
1444 | put_bh(bh); | |
1988b51e | 1445 | return 0; |
1988b51e AT |
1446 | } |
1447 | ||
a86c6181 | 1448 | /* |
d0d856e8 | 1449 | * ext4_ext_next_allocated_block: |
f17722f9 | 1450 | * returns allocated block in subsequent extent or EXT_MAX_BLOCKS. |
d0d856e8 RD |
1451 | * NOTE: it considers block number from index entry as |
1452 | * allocated block. Thus, index entries have to be consistent | |
1453 | * with leaves. | |
a86c6181 | 1454 | */ |
725d26d3 | 1455 | static ext4_lblk_t |
a86c6181 AT |
1456 | ext4_ext_next_allocated_block(struct ext4_ext_path *path) |
1457 | { | |
1458 | int depth; | |
1459 | ||
1460 | BUG_ON(path == NULL); | |
1461 | depth = path->p_depth; | |
1462 | ||
1463 | if (depth == 0 && path->p_ext == NULL) | |
f17722f9 | 1464 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1465 | |
1466 | while (depth >= 0) { | |
1467 | if (depth == path->p_depth) { | |
1468 | /* leaf */ | |
6f8ff537 CW |
1469 | if (path[depth].p_ext && |
1470 | path[depth].p_ext != | |
a86c6181 AT |
1471 | EXT_LAST_EXTENT(path[depth].p_hdr)) |
1472 | return le32_to_cpu(path[depth].p_ext[1].ee_block); | |
1473 | } else { | |
1474 | /* index */ | |
1475 | if (path[depth].p_idx != | |
1476 | EXT_LAST_INDEX(path[depth].p_hdr)) | |
1477 | return le32_to_cpu(path[depth].p_idx[1].ei_block); | |
1478 | } | |
1479 | depth--; | |
1480 | } | |
1481 | ||
f17722f9 | 1482 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1483 | } |
1484 | ||
1485 | /* | |
d0d856e8 | 1486 | * ext4_ext_next_leaf_block: |
f17722f9 | 1487 | * returns first allocated block from next leaf or EXT_MAX_BLOCKS |
a86c6181 | 1488 | */ |
5718789d | 1489 | static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path) |
a86c6181 AT |
1490 | { |
1491 | int depth; | |
1492 | ||
1493 | BUG_ON(path == NULL); | |
1494 | depth = path->p_depth; | |
1495 | ||
1496 | /* zero-tree has no leaf blocks at all */ | |
1497 | if (depth == 0) | |
f17722f9 | 1498 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1499 | |
1500 | /* go to index block */ | |
1501 | depth--; | |
1502 | ||
1503 | while (depth >= 0) { | |
1504 | if (path[depth].p_idx != | |
1505 | EXT_LAST_INDEX(path[depth].p_hdr)) | |
725d26d3 AK |
1506 | return (ext4_lblk_t) |
1507 | le32_to_cpu(path[depth].p_idx[1].ei_block); | |
a86c6181 AT |
1508 | depth--; |
1509 | } | |
1510 | ||
f17722f9 | 1511 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1512 | } |
1513 | ||
1514 | /* | |
d0d856e8 RD |
1515 | * ext4_ext_correct_indexes: |
1516 | * if leaf gets modified and modified extent is first in the leaf, | |
1517 | * then we have to correct all indexes above. | |
a86c6181 AT |
1518 | * TODO: do we need to correct tree in all cases? |
1519 | */ | |
1d03ec98 | 1520 | static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode, |
a86c6181 AT |
1521 | struct ext4_ext_path *path) |
1522 | { | |
1523 | struct ext4_extent_header *eh; | |
1524 | int depth = ext_depth(inode); | |
1525 | struct ext4_extent *ex; | |
1526 | __le32 border; | |
1527 | int k, err = 0; | |
1528 | ||
1529 | eh = path[depth].p_hdr; | |
1530 | ex = path[depth].p_ext; | |
273df556 FM |
1531 | |
1532 | if (unlikely(ex == NULL || eh == NULL)) { | |
1533 | EXT4_ERROR_INODE(inode, | |
1534 | "ex %p == NULL or eh %p == NULL", ex, eh); | |
1535 | return -EIO; | |
1536 | } | |
a86c6181 AT |
1537 | |
1538 | if (depth == 0) { | |
1539 | /* there is no tree at all */ | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | if (ex != EXT_FIRST_EXTENT(eh)) { | |
1544 | /* we correct tree if first leaf got modified only */ | |
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | /* | |
d0d856e8 | 1549 | * TODO: we need correction if border is smaller than current one |
a86c6181 AT |
1550 | */ |
1551 | k = depth - 1; | |
1552 | border = path[depth].p_ext->ee_block; | |
7e028976 AM |
1553 | err = ext4_ext_get_access(handle, inode, path + k); |
1554 | if (err) | |
a86c6181 AT |
1555 | return err; |
1556 | path[k].p_idx->ei_block = border; | |
7e028976 AM |
1557 | err = ext4_ext_dirty(handle, inode, path + k); |
1558 | if (err) | |
a86c6181 AT |
1559 | return err; |
1560 | ||
1561 | while (k--) { | |
1562 | /* change all left-side indexes */ | |
1563 | if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr)) | |
1564 | break; | |
7e028976 AM |
1565 | err = ext4_ext_get_access(handle, inode, path + k); |
1566 | if (err) | |
a86c6181 AT |
1567 | break; |
1568 | path[k].p_idx->ei_block = border; | |
7e028976 AM |
1569 | err = ext4_ext_dirty(handle, inode, path + k); |
1570 | if (err) | |
a86c6181 AT |
1571 | break; |
1572 | } | |
1573 | ||
1574 | return err; | |
1575 | } | |
1576 | ||
748de673 | 1577 | int |
a86c6181 AT |
1578 | ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, |
1579 | struct ext4_extent *ex2) | |
1580 | { | |
749269fa | 1581 | unsigned short ext1_ee_len, ext2_ee_len, max_len; |
a2df2a63 AA |
1582 | |
1583 | /* | |
1584 | * Make sure that either both extents are uninitialized, or | |
1585 | * both are _not_. | |
1586 | */ | |
1587 | if (ext4_ext_is_uninitialized(ex1) ^ ext4_ext_is_uninitialized(ex2)) | |
1588 | return 0; | |
1589 | ||
749269fa AA |
1590 | if (ext4_ext_is_uninitialized(ex1)) |
1591 | max_len = EXT_UNINIT_MAX_LEN; | |
1592 | else | |
1593 | max_len = EXT_INIT_MAX_LEN; | |
1594 | ||
a2df2a63 AA |
1595 | ext1_ee_len = ext4_ext_get_actual_len(ex1); |
1596 | ext2_ee_len = ext4_ext_get_actual_len(ex2); | |
1597 | ||
1598 | if (le32_to_cpu(ex1->ee_block) + ext1_ee_len != | |
63f57933 | 1599 | le32_to_cpu(ex2->ee_block)) |
a86c6181 AT |
1600 | return 0; |
1601 | ||
471d4011 SB |
1602 | /* |
1603 | * To allow future support for preallocated extents to be added | |
1604 | * as an RO_COMPAT feature, refuse to merge to extents if | |
d0d856e8 | 1605 | * this can result in the top bit of ee_len being set. |
471d4011 | 1606 | */ |
749269fa | 1607 | if (ext1_ee_len + ext2_ee_len > max_len) |
471d4011 | 1608 | return 0; |
bbf2f9fb | 1609 | #ifdef AGGRESSIVE_TEST |
b939e376 | 1610 | if (ext1_ee_len >= 4) |
a86c6181 AT |
1611 | return 0; |
1612 | #endif | |
1613 | ||
bf89d16f | 1614 | if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2)) |
a86c6181 AT |
1615 | return 1; |
1616 | return 0; | |
1617 | } | |
1618 | ||
56055d3a AA |
1619 | /* |
1620 | * This function tries to merge the "ex" extent to the next extent in the tree. | |
1621 | * It always tries to merge towards right. If you want to merge towards | |
1622 | * left, pass "ex - 1" as argument instead of "ex". | |
1623 | * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns | |
1624 | * 1 if they got merged. | |
1625 | */ | |
197217a5 | 1626 | static int ext4_ext_try_to_merge_right(struct inode *inode, |
1f109d5a TT |
1627 | struct ext4_ext_path *path, |
1628 | struct ext4_extent *ex) | |
56055d3a AA |
1629 | { |
1630 | struct ext4_extent_header *eh; | |
1631 | unsigned int depth, len; | |
1632 | int merge_done = 0; | |
1633 | int uninitialized = 0; | |
1634 | ||
1635 | depth = ext_depth(inode); | |
1636 | BUG_ON(path[depth].p_hdr == NULL); | |
1637 | eh = path[depth].p_hdr; | |
1638 | ||
1639 | while (ex < EXT_LAST_EXTENT(eh)) { | |
1640 | if (!ext4_can_extents_be_merged(inode, ex, ex + 1)) | |
1641 | break; | |
1642 | /* merge with next extent! */ | |
1643 | if (ext4_ext_is_uninitialized(ex)) | |
1644 | uninitialized = 1; | |
1645 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) | |
1646 | + ext4_ext_get_actual_len(ex + 1)); | |
1647 | if (uninitialized) | |
1648 | ext4_ext_mark_uninitialized(ex); | |
1649 | ||
1650 | if (ex + 1 < EXT_LAST_EXTENT(eh)) { | |
1651 | len = (EXT_LAST_EXTENT(eh) - ex - 1) | |
1652 | * sizeof(struct ext4_extent); | |
1653 | memmove(ex + 1, ex + 2, len); | |
1654 | } | |
e8546d06 | 1655 | le16_add_cpu(&eh->eh_entries, -1); |
56055d3a AA |
1656 | merge_done = 1; |
1657 | WARN_ON(eh->eh_entries == 0); | |
1658 | if (!eh->eh_entries) | |
24676da4 | 1659 | EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!"); |
56055d3a AA |
1660 | } |
1661 | ||
1662 | return merge_done; | |
1663 | } | |
1664 | ||
ecb94f5f TT |
1665 | /* |
1666 | * This function does a very simple check to see if we can collapse | |
1667 | * an extent tree with a single extent tree leaf block into the inode. | |
1668 | */ | |
1669 | static void ext4_ext_try_to_merge_up(handle_t *handle, | |
1670 | struct inode *inode, | |
1671 | struct ext4_ext_path *path) | |
1672 | { | |
1673 | size_t s; | |
1674 | unsigned max_root = ext4_ext_space_root(inode, 0); | |
1675 | ext4_fsblk_t blk; | |
1676 | ||
1677 | if ((path[0].p_depth != 1) || | |
1678 | (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) || | |
1679 | (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root)) | |
1680 | return; | |
1681 | ||
1682 | /* | |
1683 | * We need to modify the block allocation bitmap and the block | |
1684 | * group descriptor to release the extent tree block. If we | |
1685 | * can't get the journal credits, give up. | |
1686 | */ | |
1687 | if (ext4_journal_extend(handle, 2)) | |
1688 | return; | |
1689 | ||
1690 | /* | |
1691 | * Copy the extent data up to the inode | |
1692 | */ | |
1693 | blk = ext4_idx_pblock(path[0].p_idx); | |
1694 | s = le16_to_cpu(path[1].p_hdr->eh_entries) * | |
1695 | sizeof(struct ext4_extent_idx); | |
1696 | s += sizeof(struct ext4_extent_header); | |
1697 | ||
1698 | memcpy(path[0].p_hdr, path[1].p_hdr, s); | |
1699 | path[0].p_depth = 0; | |
1700 | path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) + | |
1701 | (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr)); | |
1702 | path[0].p_hdr->eh_max = cpu_to_le16(max_root); | |
1703 | ||
1704 | brelse(path[1].p_bh); | |
1705 | ext4_free_blocks(handle, inode, NULL, blk, 1, | |
1706 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); | |
1707 | } | |
1708 | ||
197217a5 YY |
1709 | /* |
1710 | * This function tries to merge the @ex extent to neighbours in the tree. | |
1711 | * return 1 if merge left else 0. | |
1712 | */ | |
ecb94f5f TT |
1713 | static void ext4_ext_try_to_merge(handle_t *handle, |
1714 | struct inode *inode, | |
197217a5 YY |
1715 | struct ext4_ext_path *path, |
1716 | struct ext4_extent *ex) { | |
1717 | struct ext4_extent_header *eh; | |
1718 | unsigned int depth; | |
1719 | int merge_done = 0; | |
197217a5 YY |
1720 | |
1721 | depth = ext_depth(inode); | |
1722 | BUG_ON(path[depth].p_hdr == NULL); | |
1723 | eh = path[depth].p_hdr; | |
1724 | ||
1725 | if (ex > EXT_FIRST_EXTENT(eh)) | |
1726 | merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1); | |
1727 | ||
1728 | if (!merge_done) | |
ecb94f5f | 1729 | (void) ext4_ext_try_to_merge_right(inode, path, ex); |
197217a5 | 1730 | |
ecb94f5f | 1731 | ext4_ext_try_to_merge_up(handle, inode, path); |
197217a5 YY |
1732 | } |
1733 | ||
25d14f98 AA |
1734 | /* |
1735 | * check if a portion of the "newext" extent overlaps with an | |
1736 | * existing extent. | |
1737 | * | |
1738 | * If there is an overlap discovered, it updates the length of the newext | |
1739 | * such that there will be no overlap, and then returns 1. | |
1740 | * If there is no overlap found, it returns 0. | |
1741 | */ | |
4d33b1ef TT |
1742 | static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi, |
1743 | struct inode *inode, | |
1f109d5a TT |
1744 | struct ext4_extent *newext, |
1745 | struct ext4_ext_path *path) | |
25d14f98 | 1746 | { |
725d26d3 | 1747 | ext4_lblk_t b1, b2; |
25d14f98 AA |
1748 | unsigned int depth, len1; |
1749 | unsigned int ret = 0; | |
1750 | ||
1751 | b1 = le32_to_cpu(newext->ee_block); | |
a2df2a63 | 1752 | len1 = ext4_ext_get_actual_len(newext); |
25d14f98 AA |
1753 | depth = ext_depth(inode); |
1754 | if (!path[depth].p_ext) | |
1755 | goto out; | |
1756 | b2 = le32_to_cpu(path[depth].p_ext->ee_block); | |
4d33b1ef | 1757 | b2 &= ~(sbi->s_cluster_ratio - 1); |
25d14f98 AA |
1758 | |
1759 | /* | |
1760 | * get the next allocated block if the extent in the path | |
2b2d6d01 | 1761 | * is before the requested block(s) |
25d14f98 AA |
1762 | */ |
1763 | if (b2 < b1) { | |
1764 | b2 = ext4_ext_next_allocated_block(path); | |
f17722f9 | 1765 | if (b2 == EXT_MAX_BLOCKS) |
25d14f98 | 1766 | goto out; |
4d33b1ef | 1767 | b2 &= ~(sbi->s_cluster_ratio - 1); |
25d14f98 AA |
1768 | } |
1769 | ||
725d26d3 | 1770 | /* check for wrap through zero on extent logical start block*/ |
25d14f98 | 1771 | if (b1 + len1 < b1) { |
f17722f9 | 1772 | len1 = EXT_MAX_BLOCKS - b1; |
25d14f98 AA |
1773 | newext->ee_len = cpu_to_le16(len1); |
1774 | ret = 1; | |
1775 | } | |
1776 | ||
1777 | /* check for overlap */ | |
1778 | if (b1 + len1 > b2) { | |
1779 | newext->ee_len = cpu_to_le16(b2 - b1); | |
1780 | ret = 1; | |
1781 | } | |
1782 | out: | |
1783 | return ret; | |
1784 | } | |
1785 | ||
a86c6181 | 1786 | /* |
d0d856e8 RD |
1787 | * ext4_ext_insert_extent: |
1788 | * tries to merge requsted extent into the existing extent or | |
1789 | * inserts requested extent as new one into the tree, | |
1790 | * creating new leaf in the no-space case. | |
a86c6181 AT |
1791 | */ |
1792 | int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, | |
1793 | struct ext4_ext_path *path, | |
0031462b | 1794 | struct ext4_extent *newext, int flag) |
a86c6181 | 1795 | { |
af5bc92d | 1796 | struct ext4_extent_header *eh; |
a86c6181 AT |
1797 | struct ext4_extent *ex, *fex; |
1798 | struct ext4_extent *nearex; /* nearest extent */ | |
1799 | struct ext4_ext_path *npath = NULL; | |
725d26d3 AK |
1800 | int depth, len, err; |
1801 | ext4_lblk_t next; | |
a2df2a63 | 1802 | unsigned uninitialized = 0; |
55f020db | 1803 | int flags = 0; |
a86c6181 | 1804 | |
273df556 FM |
1805 | if (unlikely(ext4_ext_get_actual_len(newext) == 0)) { |
1806 | EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0"); | |
1807 | return -EIO; | |
1808 | } | |
a86c6181 AT |
1809 | depth = ext_depth(inode); |
1810 | ex = path[depth].p_ext; | |
273df556 FM |
1811 | if (unlikely(path[depth].p_hdr == NULL)) { |
1812 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); | |
1813 | return -EIO; | |
1814 | } | |
a86c6181 AT |
1815 | |
1816 | /* try to insert block into found extent and return */ | |
744692dc | 1817 | if (ex && !(flag & EXT4_GET_BLOCKS_PRE_IO) |
0031462b | 1818 | && ext4_can_extents_be_merged(inode, ex, newext)) { |
32de6756 | 1819 | ext_debug("append [%d]%d block to %u:[%d]%d (from %llu)\n", |
bf89d16f TT |
1820 | ext4_ext_is_uninitialized(newext), |
1821 | ext4_ext_get_actual_len(newext), | |
1822 | le32_to_cpu(ex->ee_block), | |
1823 | ext4_ext_is_uninitialized(ex), | |
1824 | ext4_ext_get_actual_len(ex), | |
1825 | ext4_ext_pblock(ex)); | |
7e028976 AM |
1826 | err = ext4_ext_get_access(handle, inode, path + depth); |
1827 | if (err) | |
a86c6181 | 1828 | return err; |
a2df2a63 AA |
1829 | |
1830 | /* | |
1831 | * ext4_can_extents_be_merged should have checked that either | |
1832 | * both extents are uninitialized, or both aren't. Thus we | |
1833 | * need to check only one of them here. | |
1834 | */ | |
1835 | if (ext4_ext_is_uninitialized(ex)) | |
1836 | uninitialized = 1; | |
1837 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) | |
1838 | + ext4_ext_get_actual_len(newext)); | |
1839 | if (uninitialized) | |
1840 | ext4_ext_mark_uninitialized(ex); | |
a86c6181 AT |
1841 | eh = path[depth].p_hdr; |
1842 | nearex = ex; | |
1843 | goto merge; | |
1844 | } | |
1845 | ||
a86c6181 AT |
1846 | depth = ext_depth(inode); |
1847 | eh = path[depth].p_hdr; | |
1848 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) | |
1849 | goto has_space; | |
1850 | ||
1851 | /* probably next leaf has space for us? */ | |
1852 | fex = EXT_LAST_EXTENT(eh); | |
598dbdf2 RD |
1853 | next = EXT_MAX_BLOCKS; |
1854 | if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block)) | |
5718789d | 1855 | next = ext4_ext_next_leaf_block(path); |
598dbdf2 | 1856 | if (next != EXT_MAX_BLOCKS) { |
32de6756 | 1857 | ext_debug("next leaf block - %u\n", next); |
a86c6181 AT |
1858 | BUG_ON(npath != NULL); |
1859 | npath = ext4_ext_find_extent(inode, next, NULL); | |
1860 | if (IS_ERR(npath)) | |
1861 | return PTR_ERR(npath); | |
1862 | BUG_ON(npath->p_depth != path->p_depth); | |
1863 | eh = npath[depth].p_hdr; | |
1864 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) { | |
25985edc | 1865 | ext_debug("next leaf isn't full(%d)\n", |
a86c6181 AT |
1866 | le16_to_cpu(eh->eh_entries)); |
1867 | path = npath; | |
ffb505ff | 1868 | goto has_space; |
a86c6181 AT |
1869 | } |
1870 | ext_debug("next leaf has no free space(%d,%d)\n", | |
1871 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); | |
1872 | } | |
1873 | ||
1874 | /* | |
d0d856e8 RD |
1875 | * There is no free space in the found leaf. |
1876 | * We're gonna add a new leaf in the tree. | |
a86c6181 | 1877 | */ |
55f020db AH |
1878 | if (flag & EXT4_GET_BLOCKS_PUNCH_OUT_EXT) |
1879 | flags = EXT4_MB_USE_ROOT_BLOCKS; | |
1880 | err = ext4_ext_create_new_leaf(handle, inode, flags, path, newext); | |
a86c6181 AT |
1881 | if (err) |
1882 | goto cleanup; | |
1883 | depth = ext_depth(inode); | |
1884 | eh = path[depth].p_hdr; | |
1885 | ||
1886 | has_space: | |
1887 | nearex = path[depth].p_ext; | |
1888 | ||
7e028976 AM |
1889 | err = ext4_ext_get_access(handle, inode, path + depth); |
1890 | if (err) | |
a86c6181 AT |
1891 | goto cleanup; |
1892 | ||
1893 | if (!nearex) { | |
1894 | /* there is no extent in this leaf, create first one */ | |
32de6756 | 1895 | ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n", |
8c55e204 | 1896 | le32_to_cpu(newext->ee_block), |
bf89d16f | 1897 | ext4_ext_pblock(newext), |
553f9008 | 1898 | ext4_ext_is_uninitialized(newext), |
a2df2a63 | 1899 | ext4_ext_get_actual_len(newext)); |
80e675f9 EG |
1900 | nearex = EXT_FIRST_EXTENT(eh); |
1901 | } else { | |
1902 | if (le32_to_cpu(newext->ee_block) | |
8c55e204 | 1903 | > le32_to_cpu(nearex->ee_block)) { |
80e675f9 | 1904 | /* Insert after */ |
32de6756 YY |
1905 | ext_debug("insert %u:%llu:[%d]%d before: " |
1906 | "nearest %p\n", | |
80e675f9 EG |
1907 | le32_to_cpu(newext->ee_block), |
1908 | ext4_ext_pblock(newext), | |
1909 | ext4_ext_is_uninitialized(newext), | |
1910 | ext4_ext_get_actual_len(newext), | |
1911 | nearex); | |
1912 | nearex++; | |
1913 | } else { | |
1914 | /* Insert before */ | |
1915 | BUG_ON(newext->ee_block == nearex->ee_block); | |
32de6756 YY |
1916 | ext_debug("insert %u:%llu:[%d]%d after: " |
1917 | "nearest %p\n", | |
8c55e204 | 1918 | le32_to_cpu(newext->ee_block), |
bf89d16f | 1919 | ext4_ext_pblock(newext), |
553f9008 | 1920 | ext4_ext_is_uninitialized(newext), |
a2df2a63 | 1921 | ext4_ext_get_actual_len(newext), |
80e675f9 EG |
1922 | nearex); |
1923 | } | |
1924 | len = EXT_LAST_EXTENT(eh) - nearex + 1; | |
1925 | if (len > 0) { | |
32de6756 | 1926 | ext_debug("insert %u:%llu:[%d]%d: " |
80e675f9 EG |
1927 | "move %d extents from 0x%p to 0x%p\n", |
1928 | le32_to_cpu(newext->ee_block), | |
1929 | ext4_ext_pblock(newext), | |
1930 | ext4_ext_is_uninitialized(newext), | |
1931 | ext4_ext_get_actual_len(newext), | |
1932 | len, nearex, nearex + 1); | |
1933 | memmove(nearex + 1, nearex, | |
1934 | len * sizeof(struct ext4_extent)); | |
a86c6181 | 1935 | } |
a86c6181 AT |
1936 | } |
1937 | ||
e8546d06 | 1938 | le16_add_cpu(&eh->eh_entries, 1); |
80e675f9 | 1939 | path[depth].p_ext = nearex; |
a86c6181 | 1940 | nearex->ee_block = newext->ee_block; |
bf89d16f | 1941 | ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext)); |
a86c6181 | 1942 | nearex->ee_len = newext->ee_len; |
a86c6181 AT |
1943 | |
1944 | merge: | |
e7bcf823 | 1945 | /* try to merge extents */ |
744692dc | 1946 | if (!(flag & EXT4_GET_BLOCKS_PRE_IO)) |
ecb94f5f | 1947 | ext4_ext_try_to_merge(handle, inode, path, nearex); |
a86c6181 | 1948 | |
a86c6181 AT |
1949 | |
1950 | /* time to correct all indexes above */ | |
1951 | err = ext4_ext_correct_indexes(handle, inode, path); | |
1952 | if (err) | |
1953 | goto cleanup; | |
1954 | ||
ecb94f5f | 1955 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
a86c6181 AT |
1956 | |
1957 | cleanup: | |
1958 | if (npath) { | |
1959 | ext4_ext_drop_refs(npath); | |
1960 | kfree(npath); | |
1961 | } | |
a86c6181 AT |
1962 | ext4_ext_invalidate_cache(inode); |
1963 | return err; | |
1964 | } | |
1965 | ||
91dd8c11 LC |
1966 | static int ext4_fill_fiemap_extents(struct inode *inode, |
1967 | ext4_lblk_t block, ext4_lblk_t num, | |
1968 | struct fiemap_extent_info *fieinfo) | |
6873fa0d ES |
1969 | { |
1970 | struct ext4_ext_path *path = NULL; | |
06348679 | 1971 | struct ext4_ext_cache newex; |
6873fa0d | 1972 | struct ext4_extent *ex; |
91dd8c11 | 1973 | ext4_lblk_t next, next_del, start = 0, end = 0; |
6873fa0d | 1974 | ext4_lblk_t last = block + num; |
91dd8c11 LC |
1975 | int exists, depth = 0, err = 0; |
1976 | unsigned int flags = 0; | |
1977 | unsigned char blksize_bits = inode->i_sb->s_blocksize_bits; | |
6873fa0d | 1978 | |
f17722f9 | 1979 | while (block < last && block != EXT_MAX_BLOCKS) { |
6873fa0d ES |
1980 | num = last - block; |
1981 | /* find extent for this block */ | |
fab3a549 | 1982 | down_read(&EXT4_I(inode)->i_data_sem); |
91dd8c11 LC |
1983 | |
1984 | if (path && ext_depth(inode) != depth) { | |
1985 | /* depth was changed. we have to realloc path */ | |
1986 | kfree(path); | |
1987 | path = NULL; | |
1988 | } | |
1989 | ||
6873fa0d ES |
1990 | path = ext4_ext_find_extent(inode, block, path); |
1991 | if (IS_ERR(path)) { | |
91dd8c11 | 1992 | up_read(&EXT4_I(inode)->i_data_sem); |
6873fa0d ES |
1993 | err = PTR_ERR(path); |
1994 | path = NULL; | |
1995 | break; | |
1996 | } | |
1997 | ||
1998 | depth = ext_depth(inode); | |
273df556 | 1999 | if (unlikely(path[depth].p_hdr == NULL)) { |
91dd8c11 | 2000 | up_read(&EXT4_I(inode)->i_data_sem); |
273df556 FM |
2001 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
2002 | err = -EIO; | |
2003 | break; | |
2004 | } | |
6873fa0d ES |
2005 | ex = path[depth].p_ext; |
2006 | next = ext4_ext_next_allocated_block(path); | |
91dd8c11 | 2007 | ext4_ext_drop_refs(path); |
6873fa0d | 2008 | |
91dd8c11 | 2009 | flags = 0; |
6873fa0d ES |
2010 | exists = 0; |
2011 | if (!ex) { | |
2012 | /* there is no extent yet, so try to allocate | |
2013 | * all requested space */ | |
2014 | start = block; | |
2015 | end = block + num; | |
2016 | } else if (le32_to_cpu(ex->ee_block) > block) { | |
2017 | /* need to allocate space before found extent */ | |
2018 | start = block; | |
2019 | end = le32_to_cpu(ex->ee_block); | |
2020 | if (block + num < end) | |
2021 | end = block + num; | |
2022 | } else if (block >= le32_to_cpu(ex->ee_block) | |
2023 | + ext4_ext_get_actual_len(ex)) { | |
2024 | /* need to allocate space after found extent */ | |
2025 | start = block; | |
2026 | end = block + num; | |
2027 | if (end >= next) | |
2028 | end = next; | |
2029 | } else if (block >= le32_to_cpu(ex->ee_block)) { | |
2030 | /* | |
2031 | * some part of requested space is covered | |
2032 | * by found extent | |
2033 | */ | |
2034 | start = block; | |
2035 | end = le32_to_cpu(ex->ee_block) | |
2036 | + ext4_ext_get_actual_len(ex); | |
2037 | if (block + num < end) | |
2038 | end = block + num; | |
2039 | exists = 1; | |
2040 | } else { | |
2041 | BUG(); | |
2042 | } | |
2043 | BUG_ON(end <= start); | |
2044 | ||
2045 | if (!exists) { | |
06348679 LC |
2046 | newex.ec_block = start; |
2047 | newex.ec_len = end - start; | |
2048 | newex.ec_start = 0; | |
6873fa0d | 2049 | } else { |
06348679 LC |
2050 | newex.ec_block = le32_to_cpu(ex->ee_block); |
2051 | newex.ec_len = ext4_ext_get_actual_len(ex); | |
2052 | newex.ec_start = ext4_ext_pblock(ex); | |
91dd8c11 LC |
2053 | if (ext4_ext_is_uninitialized(ex)) |
2054 | flags |= FIEMAP_EXTENT_UNWRITTEN; | |
6873fa0d ES |
2055 | } |
2056 | ||
91dd8c11 | 2057 | /* |
06348679 LC |
2058 | * Find delayed extent and update newex accordingly. We call |
2059 | * it even in !exists case to find out whether newex is the | |
91dd8c11 LC |
2060 | * last existing extent or not. |
2061 | */ | |
06348679 | 2062 | next_del = ext4_find_delayed_extent(inode, &newex); |
91dd8c11 LC |
2063 | if (!exists && next_del) { |
2064 | exists = 1; | |
2065 | flags |= FIEMAP_EXTENT_DELALLOC; | |
2066 | } | |
2067 | up_read(&EXT4_I(inode)->i_data_sem); | |
2068 | ||
06348679 LC |
2069 | if (unlikely(newex.ec_len == 0)) { |
2070 | EXT4_ERROR_INODE(inode, "newex.ec_len == 0"); | |
273df556 FM |
2071 | err = -EIO; |
2072 | break; | |
2073 | } | |
6873fa0d | 2074 | |
91dd8c11 LC |
2075 | /* This is possible iff next == next_del == EXT_MAX_BLOCKS */ |
2076 | if (next == next_del) { | |
2077 | flags |= FIEMAP_EXTENT_LAST; | |
2078 | if (unlikely(next_del != EXT_MAX_BLOCKS || | |
2079 | next != EXT_MAX_BLOCKS)) { | |
2080 | EXT4_ERROR_INODE(inode, | |
2081 | "next extent == %u, next " | |
2082 | "delalloc extent = %u", | |
2083 | next, next_del); | |
2084 | err = -EIO; | |
2085 | break; | |
2086 | } | |
6873fa0d ES |
2087 | } |
2088 | ||
91dd8c11 LC |
2089 | if (exists) { |
2090 | err = fiemap_fill_next_extent(fieinfo, | |
06348679 LC |
2091 | (__u64)newex.ec_block << blksize_bits, |
2092 | (__u64)newex.ec_start << blksize_bits, | |
2093 | (__u64)newex.ec_len << blksize_bits, | |
91dd8c11 LC |
2094 | flags); |
2095 | if (err < 0) | |
2096 | break; | |
2097 | if (err == 1) { | |
2098 | err = 0; | |
2099 | break; | |
2100 | } | |
6873fa0d ES |
2101 | } |
2102 | ||
06348679 | 2103 | block = newex.ec_block + newex.ec_len; |
6873fa0d ES |
2104 | } |
2105 | ||
2106 | if (path) { | |
2107 | ext4_ext_drop_refs(path); | |
2108 | kfree(path); | |
2109 | } | |
2110 | ||
2111 | return err; | |
2112 | } | |
2113 | ||
09b88252 | 2114 | static void |
725d26d3 | 2115 | ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block, |
b05e6ae5 | 2116 | __u32 len, ext4_fsblk_t start) |
a86c6181 AT |
2117 | { |
2118 | struct ext4_ext_cache *cex; | |
2119 | BUG_ON(len == 0); | |
2ec0ae3a | 2120 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); |
d8990240 | 2121 | trace_ext4_ext_put_in_cache(inode, block, len, start); |
a86c6181 | 2122 | cex = &EXT4_I(inode)->i_cached_extent; |
a86c6181 AT |
2123 | cex->ec_block = block; |
2124 | cex->ec_len = len; | |
2125 | cex->ec_start = start; | |
2ec0ae3a | 2126 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
a86c6181 AT |
2127 | } |
2128 | ||
2129 | /* | |
d0d856e8 RD |
2130 | * ext4_ext_put_gap_in_cache: |
2131 | * calculate boundaries of the gap that the requested block fits into | |
a86c6181 AT |
2132 | * and cache this gap |
2133 | */ | |
09b88252 | 2134 | static void |
a86c6181 | 2135 | ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path, |
725d26d3 | 2136 | ext4_lblk_t block) |
a86c6181 AT |
2137 | { |
2138 | int depth = ext_depth(inode); | |
725d26d3 AK |
2139 | unsigned long len; |
2140 | ext4_lblk_t lblock; | |
a86c6181 AT |
2141 | struct ext4_extent *ex; |
2142 | ||
2143 | ex = path[depth].p_ext; | |
2144 | if (ex == NULL) { | |
2145 | /* there is no extent yet, so gap is [0;-] */ | |
2146 | lblock = 0; | |
f17722f9 | 2147 | len = EXT_MAX_BLOCKS; |
a86c6181 AT |
2148 | ext_debug("cache gap(whole file):"); |
2149 | } else if (block < le32_to_cpu(ex->ee_block)) { | |
2150 | lblock = block; | |
2151 | len = le32_to_cpu(ex->ee_block) - block; | |
bba90743 ES |
2152 | ext_debug("cache gap(before): %u [%u:%u]", |
2153 | block, | |
2154 | le32_to_cpu(ex->ee_block), | |
2155 | ext4_ext_get_actual_len(ex)); | |
a86c6181 | 2156 | } else if (block >= le32_to_cpu(ex->ee_block) |
a2df2a63 | 2157 | + ext4_ext_get_actual_len(ex)) { |
725d26d3 | 2158 | ext4_lblk_t next; |
8c55e204 | 2159 | lblock = le32_to_cpu(ex->ee_block) |
a2df2a63 | 2160 | + ext4_ext_get_actual_len(ex); |
725d26d3 AK |
2161 | |
2162 | next = ext4_ext_next_allocated_block(path); | |
bba90743 ES |
2163 | ext_debug("cache gap(after): [%u:%u] %u", |
2164 | le32_to_cpu(ex->ee_block), | |
2165 | ext4_ext_get_actual_len(ex), | |
2166 | block); | |
725d26d3 AK |
2167 | BUG_ON(next == lblock); |
2168 | len = next - lblock; | |
a86c6181 AT |
2169 | } else { |
2170 | lblock = len = 0; | |
2171 | BUG(); | |
2172 | } | |
2173 | ||
bba90743 | 2174 | ext_debug(" -> %u:%lu\n", lblock, len); |
b05e6ae5 | 2175 | ext4_ext_put_in_cache(inode, lblock, len, 0); |
a86c6181 AT |
2176 | } |
2177 | ||
b05e6ae5 | 2178 | /* |
63fedaf1 | 2179 | * ext4_ext_in_cache() |
a4bb6b64 AH |
2180 | * Checks to see if the given block is in the cache. |
2181 | * If it is, the cached extent is stored in the given | |
63fedaf1 | 2182 | * cache extent pointer. |
a4bb6b64 AH |
2183 | * |
2184 | * @inode: The files inode | |
2185 | * @block: The block to look for in the cache | |
2186 | * @ex: Pointer where the cached extent will be stored | |
2187 | * if it contains block | |
2188 | * | |
b05e6ae5 TT |
2189 | * Return 0 if cache is invalid; 1 if the cache is valid |
2190 | */ | |
63fedaf1 LC |
2191 | static int |
2192 | ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block, | |
2193 | struct ext4_extent *ex) | |
2194 | { | |
a86c6181 | 2195 | struct ext4_ext_cache *cex; |
77f4135f | 2196 | struct ext4_sb_info *sbi; |
b05e6ae5 | 2197 | int ret = 0; |
a86c6181 | 2198 | |
60e6679e | 2199 | /* |
2ec0ae3a TT |
2200 | * We borrow i_block_reservation_lock to protect i_cached_extent |
2201 | */ | |
2202 | spin_lock(&EXT4_I(inode)->i_block_reservation_lock); | |
a86c6181 | 2203 | cex = &EXT4_I(inode)->i_cached_extent; |
77f4135f | 2204 | sbi = EXT4_SB(inode->i_sb); |
a86c6181 AT |
2205 | |
2206 | /* has cache valid data? */ | |
b05e6ae5 | 2207 | if (cex->ec_len == 0) |
2ec0ae3a | 2208 | goto errout; |
a86c6181 | 2209 | |
731eb1a0 | 2210 | if (in_range(block, cex->ec_block, cex->ec_len)) { |
63fedaf1 LC |
2211 | ex->ee_block = cpu_to_le32(cex->ec_block); |
2212 | ext4_ext_store_pblock(ex, cex->ec_start); | |
2213 | ex->ee_len = cpu_to_le16(cex->ec_len); | |
bba90743 ES |
2214 | ext_debug("%u cached by %u:%u:%llu\n", |
2215 | block, | |
2216 | cex->ec_block, cex->ec_len, cex->ec_start); | |
b05e6ae5 | 2217 | ret = 1; |
a86c6181 | 2218 | } |
2ec0ae3a | 2219 | errout: |
d8990240 | 2220 | trace_ext4_ext_in_cache(inode, block, ret); |
2ec0ae3a TT |
2221 | spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); |
2222 | return ret; | |
a86c6181 AT |
2223 | } |
2224 | ||
2225 | /* | |
d0d856e8 RD |
2226 | * ext4_ext_rm_idx: |
2227 | * removes index from the index block. | |
a86c6181 | 2228 | */ |
1d03ec98 | 2229 | static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, |
a86c6181 AT |
2230 | struct ext4_ext_path *path) |
2231 | { | |
a86c6181 | 2232 | int err; |
f65e6fba | 2233 | ext4_fsblk_t leaf; |
a86c6181 AT |
2234 | |
2235 | /* free index block */ | |
2236 | path--; | |
bf89d16f | 2237 | leaf = ext4_idx_pblock(path->p_idx); |
273df556 FM |
2238 | if (unlikely(path->p_hdr->eh_entries == 0)) { |
2239 | EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0"); | |
2240 | return -EIO; | |
2241 | } | |
7e028976 AM |
2242 | err = ext4_ext_get_access(handle, inode, path); |
2243 | if (err) | |
a86c6181 | 2244 | return err; |
0e1147b0 RD |
2245 | |
2246 | if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) { | |
2247 | int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx; | |
2248 | len *= sizeof(struct ext4_extent_idx); | |
2249 | memmove(path->p_idx, path->p_idx + 1, len); | |
2250 | } | |
2251 | ||
e8546d06 | 2252 | le16_add_cpu(&path->p_hdr->eh_entries, -1); |
7e028976 AM |
2253 | err = ext4_ext_dirty(handle, inode, path); |
2254 | if (err) | |
a86c6181 | 2255 | return err; |
2ae02107 | 2256 | ext_debug("index is empty, remove it, free block %llu\n", leaf); |
d8990240 AK |
2257 | trace_ext4_ext_rm_idx(inode, leaf); |
2258 | ||
7dc57615 | 2259 | ext4_free_blocks(handle, inode, NULL, leaf, 1, |
e6362609 | 2260 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
a86c6181 AT |
2261 | return err; |
2262 | } | |
2263 | ||
2264 | /* | |
ee12b630 MC |
2265 | * ext4_ext_calc_credits_for_single_extent: |
2266 | * This routine returns max. credits that needed to insert an extent | |
2267 | * to the extent tree. | |
2268 | * When pass the actual path, the caller should calculate credits | |
2269 | * under i_data_sem. | |
a86c6181 | 2270 | */ |
525f4ed8 | 2271 | int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks, |
a86c6181 AT |
2272 | struct ext4_ext_path *path) |
2273 | { | |
a86c6181 | 2274 | if (path) { |
ee12b630 | 2275 | int depth = ext_depth(inode); |
f3bd1f3f | 2276 | int ret = 0; |
ee12b630 | 2277 | |
a86c6181 | 2278 | /* probably there is space in leaf? */ |
a86c6181 | 2279 | if (le16_to_cpu(path[depth].p_hdr->eh_entries) |
ee12b630 | 2280 | < le16_to_cpu(path[depth].p_hdr->eh_max)) { |
a86c6181 | 2281 | |
ee12b630 MC |
2282 | /* |
2283 | * There are some space in the leaf tree, no | |
2284 | * need to account for leaf block credit | |
2285 | * | |
2286 | * bitmaps and block group descriptor blocks | |
df3ab170 | 2287 | * and other metadata blocks still need to be |
ee12b630 MC |
2288 | * accounted. |
2289 | */ | |
525f4ed8 | 2290 | /* 1 bitmap, 1 block group descriptor */ |
ee12b630 | 2291 | ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb); |
5887e98b | 2292 | return ret; |
ee12b630 MC |
2293 | } |
2294 | } | |
a86c6181 | 2295 | |
525f4ed8 | 2296 | return ext4_chunk_trans_blocks(inode, nrblocks); |
ee12b630 | 2297 | } |
a86c6181 | 2298 | |
ee12b630 MC |
2299 | /* |
2300 | * How many index/leaf blocks need to change/allocate to modify nrblocks? | |
2301 | * | |
2302 | * if nrblocks are fit in a single extent (chunk flag is 1), then | |
2303 | * in the worse case, each tree level index/leaf need to be changed | |
2304 | * if the tree split due to insert a new extent, then the old tree | |
2305 | * index/leaf need to be updated too | |
2306 | * | |
2307 | * If the nrblocks are discontiguous, they could cause | |
2308 | * the whole tree split more than once, but this is really rare. | |
2309 | */ | |
525f4ed8 | 2310 | int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk) |
ee12b630 MC |
2311 | { |
2312 | int index; | |
2313 | int depth = ext_depth(inode); | |
a86c6181 | 2314 | |
ee12b630 MC |
2315 | if (chunk) |
2316 | index = depth * 2; | |
2317 | else | |
2318 | index = depth * 3; | |
a86c6181 | 2319 | |
ee12b630 | 2320 | return index; |
a86c6181 AT |
2321 | } |
2322 | ||
2323 | static int ext4_remove_blocks(handle_t *handle, struct inode *inode, | |
0aa06000 TT |
2324 | struct ext4_extent *ex, |
2325 | ext4_fsblk_t *partial_cluster, | |
2326 | ext4_lblk_t from, ext4_lblk_t to) | |
a86c6181 | 2327 | { |
0aa06000 | 2328 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
a2df2a63 | 2329 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
0aa06000 | 2330 | ext4_fsblk_t pblk; |
18888cf0 | 2331 | int flags = 0; |
a86c6181 | 2332 | |
c9de560d | 2333 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) |
18888cf0 AS |
2334 | flags |= EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET; |
2335 | else if (ext4_should_journal_data(inode)) | |
2336 | flags |= EXT4_FREE_BLOCKS_FORGET; | |
2337 | ||
0aa06000 TT |
2338 | /* |
2339 | * For bigalloc file systems, we never free a partial cluster | |
2340 | * at the beginning of the extent. Instead, we make a note | |
2341 | * that we tried freeing the cluster, and check to see if we | |
2342 | * need to free it on a subsequent call to ext4_remove_blocks, | |
2343 | * or at the end of the ext4_truncate() operation. | |
2344 | */ | |
2345 | flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER; | |
2346 | ||
d8990240 | 2347 | trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster); |
0aa06000 TT |
2348 | /* |
2349 | * If we have a partial cluster, and it's different from the | |
2350 | * cluster of the last block, we need to explicitly free the | |
2351 | * partial cluster here. | |
2352 | */ | |
2353 | pblk = ext4_ext_pblock(ex) + ee_len - 1; | |
2354 | if (*partial_cluster && (EXT4_B2C(sbi, pblk) != *partial_cluster)) { | |
2355 | ext4_free_blocks(handle, inode, NULL, | |
2356 | EXT4_C2B(sbi, *partial_cluster), | |
2357 | sbi->s_cluster_ratio, flags); | |
2358 | *partial_cluster = 0; | |
2359 | } | |
2360 | ||
a86c6181 AT |
2361 | #ifdef EXTENTS_STATS |
2362 | { | |
2363 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
a86c6181 AT |
2364 | spin_lock(&sbi->s_ext_stats_lock); |
2365 | sbi->s_ext_blocks += ee_len; | |
2366 | sbi->s_ext_extents++; | |
2367 | if (ee_len < sbi->s_ext_min) | |
2368 | sbi->s_ext_min = ee_len; | |
2369 | if (ee_len > sbi->s_ext_max) | |
2370 | sbi->s_ext_max = ee_len; | |
2371 | if (ext_depth(inode) > sbi->s_depth_max) | |
2372 | sbi->s_depth_max = ext_depth(inode); | |
2373 | spin_unlock(&sbi->s_ext_stats_lock); | |
2374 | } | |
2375 | #endif | |
2376 | if (from >= le32_to_cpu(ex->ee_block) | |
a2df2a63 | 2377 | && to == le32_to_cpu(ex->ee_block) + ee_len - 1) { |
a86c6181 | 2378 | /* tail removal */ |
725d26d3 | 2379 | ext4_lblk_t num; |
725d26d3 | 2380 | |
a2df2a63 | 2381 | num = le32_to_cpu(ex->ee_block) + ee_len - from; |
0aa06000 TT |
2382 | pblk = ext4_ext_pblock(ex) + ee_len - num; |
2383 | ext_debug("free last %u blocks starting %llu\n", num, pblk); | |
2384 | ext4_free_blocks(handle, inode, NULL, pblk, num, flags); | |
2385 | /* | |
2386 | * If the block range to be freed didn't start at the | |
2387 | * beginning of a cluster, and we removed the entire | |
2388 | * extent, save the partial cluster here, since we | |
2389 | * might need to delete if we determine that the | |
2390 | * truncate operation has removed all of the blocks in | |
2391 | * the cluster. | |
2392 | */ | |
2393 | if (pblk & (sbi->s_cluster_ratio - 1) && | |
2394 | (ee_len == num)) | |
2395 | *partial_cluster = EXT4_B2C(sbi, pblk); | |
2396 | else | |
2397 | *partial_cluster = 0; | |
a86c6181 | 2398 | } else if (from == le32_to_cpu(ex->ee_block) |
a2df2a63 | 2399 | && to <= le32_to_cpu(ex->ee_block) + ee_len - 1) { |
d583fb87 AH |
2400 | /* head removal */ |
2401 | ext4_lblk_t num; | |
2402 | ext4_fsblk_t start; | |
2403 | ||
2404 | num = to - from; | |
2405 | start = ext4_ext_pblock(ex); | |
2406 | ||
2407 | ext_debug("free first %u blocks starting %llu\n", num, start); | |
ee90d57e | 2408 | ext4_free_blocks(handle, inode, NULL, start, num, flags); |
d583fb87 | 2409 | |
a86c6181 | 2410 | } else { |
725d26d3 AK |
2411 | printk(KERN_INFO "strange request: removal(2) " |
2412 | "%u-%u from %u:%u\n", | |
2413 | from, to, le32_to_cpu(ex->ee_block), ee_len); | |
a86c6181 AT |
2414 | } |
2415 | return 0; | |
2416 | } | |
2417 | ||
d583fb87 AH |
2418 | |
2419 | /* | |
2420 | * ext4_ext_rm_leaf() Removes the extents associated with the | |
2421 | * blocks appearing between "start" and "end", and splits the extents | |
2422 | * if "start" and "end" appear in the same extent | |
2423 | * | |
2424 | * @handle: The journal handle | |
2425 | * @inode: The files inode | |
2426 | * @path: The path to the leaf | |
2427 | * @start: The first block to remove | |
2428 | * @end: The last block to remove | |
2429 | */ | |
a86c6181 AT |
2430 | static int |
2431 | ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, | |
0aa06000 TT |
2432 | struct ext4_ext_path *path, ext4_fsblk_t *partial_cluster, |
2433 | ext4_lblk_t start, ext4_lblk_t end) | |
a86c6181 | 2434 | { |
0aa06000 | 2435 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
a86c6181 AT |
2436 | int err = 0, correct_index = 0; |
2437 | int depth = ext_depth(inode), credits; | |
2438 | struct ext4_extent_header *eh; | |
750c9c47 | 2439 | ext4_lblk_t a, b; |
725d26d3 AK |
2440 | unsigned num; |
2441 | ext4_lblk_t ex_ee_block; | |
a86c6181 | 2442 | unsigned short ex_ee_len; |
a2df2a63 | 2443 | unsigned uninitialized = 0; |
a86c6181 AT |
2444 | struct ext4_extent *ex; |
2445 | ||
c29c0ae7 | 2446 | /* the header must be checked already in ext4_ext_remove_space() */ |
5f95d21f | 2447 | ext_debug("truncate since %u in leaf to %u\n", start, end); |
a86c6181 AT |
2448 | if (!path[depth].p_hdr) |
2449 | path[depth].p_hdr = ext_block_hdr(path[depth].p_bh); | |
2450 | eh = path[depth].p_hdr; | |
273df556 FM |
2451 | if (unlikely(path[depth].p_hdr == NULL)) { |
2452 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); | |
2453 | return -EIO; | |
2454 | } | |
a86c6181 AT |
2455 | /* find where to start removing */ |
2456 | ex = EXT_LAST_EXTENT(eh); | |
2457 | ||
2458 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
a2df2a63 | 2459 | ex_ee_len = ext4_ext_get_actual_len(ex); |
a86c6181 | 2460 | |
d8990240 AK |
2461 | trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster); |
2462 | ||
a86c6181 AT |
2463 | while (ex >= EXT_FIRST_EXTENT(eh) && |
2464 | ex_ee_block + ex_ee_len > start) { | |
a41f2071 AK |
2465 | |
2466 | if (ext4_ext_is_uninitialized(ex)) | |
2467 | uninitialized = 1; | |
2468 | else | |
2469 | uninitialized = 0; | |
2470 | ||
553f9008 M |
2471 | ext_debug("remove ext %u:[%d]%d\n", ex_ee_block, |
2472 | uninitialized, ex_ee_len); | |
a86c6181 AT |
2473 | path[depth].p_ext = ex; |
2474 | ||
2475 | a = ex_ee_block > start ? ex_ee_block : start; | |
d583fb87 AH |
2476 | b = ex_ee_block+ex_ee_len - 1 < end ? |
2477 | ex_ee_block+ex_ee_len - 1 : end; | |
a86c6181 AT |
2478 | |
2479 | ext_debug(" border %u:%u\n", a, b); | |
2480 | ||
d583fb87 | 2481 | /* If this extent is beyond the end of the hole, skip it */ |
5f95d21f | 2482 | if (end < ex_ee_block) { |
d583fb87 AH |
2483 | ex--; |
2484 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
2485 | ex_ee_len = ext4_ext_get_actual_len(ex); | |
2486 | continue; | |
750c9c47 | 2487 | } else if (b != ex_ee_block + ex_ee_len - 1) { |
dc1841d6 LC |
2488 | EXT4_ERROR_INODE(inode, |
2489 | "can not handle truncate %u:%u " | |
2490 | "on extent %u:%u", | |
2491 | start, end, ex_ee_block, | |
2492 | ex_ee_block + ex_ee_len - 1); | |
750c9c47 DM |
2493 | err = -EIO; |
2494 | goto out; | |
a86c6181 AT |
2495 | } else if (a != ex_ee_block) { |
2496 | /* remove tail of the extent */ | |
750c9c47 | 2497 | num = a - ex_ee_block; |
a86c6181 AT |
2498 | } else { |
2499 | /* remove whole extent: excellent! */ | |
a86c6181 | 2500 | num = 0; |
a86c6181 | 2501 | } |
34071da7 TT |
2502 | /* |
2503 | * 3 for leaf, sb, and inode plus 2 (bmap and group | |
2504 | * descriptor) for each block group; assume two block | |
2505 | * groups plus ex_ee_len/blocks_per_block_group for | |
2506 | * the worst case | |
2507 | */ | |
2508 | credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb)); | |
a86c6181 AT |
2509 | if (ex == EXT_FIRST_EXTENT(eh)) { |
2510 | correct_index = 1; | |
2511 | credits += (ext_depth(inode)) + 1; | |
2512 | } | |
5aca07eb | 2513 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
a86c6181 | 2514 | |
487caeef | 2515 | err = ext4_ext_truncate_extend_restart(handle, inode, credits); |
9102e4fa | 2516 | if (err) |
a86c6181 | 2517 | goto out; |
a86c6181 AT |
2518 | |
2519 | err = ext4_ext_get_access(handle, inode, path + depth); | |
2520 | if (err) | |
2521 | goto out; | |
2522 | ||
0aa06000 TT |
2523 | err = ext4_remove_blocks(handle, inode, ex, partial_cluster, |
2524 | a, b); | |
a86c6181 AT |
2525 | if (err) |
2526 | goto out; | |
2527 | ||
750c9c47 | 2528 | if (num == 0) |
d0d856e8 | 2529 | /* this extent is removed; mark slot entirely unused */ |
f65e6fba | 2530 | ext4_ext_store_pblock(ex, 0); |
a86c6181 | 2531 | |
a86c6181 | 2532 | ex->ee_len = cpu_to_le16(num); |
749269fa AA |
2533 | /* |
2534 | * Do not mark uninitialized if all the blocks in the | |
2535 | * extent have been removed. | |
2536 | */ | |
2537 | if (uninitialized && num) | |
a2df2a63 | 2538 | ext4_ext_mark_uninitialized(ex); |
d583fb87 AH |
2539 | /* |
2540 | * If the extent was completely released, | |
2541 | * we need to remove it from the leaf | |
2542 | */ | |
2543 | if (num == 0) { | |
f17722f9 | 2544 | if (end != EXT_MAX_BLOCKS - 1) { |
d583fb87 AH |
2545 | /* |
2546 | * For hole punching, we need to scoot all the | |
2547 | * extents up when an extent is removed so that | |
2548 | * we dont have blank extents in the middle | |
2549 | */ | |
2550 | memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) * | |
2551 | sizeof(struct ext4_extent)); | |
2552 | ||
2553 | /* Now get rid of the one at the end */ | |
2554 | memset(EXT_LAST_EXTENT(eh), 0, | |
2555 | sizeof(struct ext4_extent)); | |
2556 | } | |
2557 | le16_add_cpu(&eh->eh_entries, -1); | |
0aa06000 TT |
2558 | } else |
2559 | *partial_cluster = 0; | |
d583fb87 | 2560 | |
750c9c47 DM |
2561 | err = ext4_ext_dirty(handle, inode, path + depth); |
2562 | if (err) | |
2563 | goto out; | |
2564 | ||
bf52c6f7 | 2565 | ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num, |
bf89d16f | 2566 | ext4_ext_pblock(ex)); |
a86c6181 AT |
2567 | ex--; |
2568 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
a2df2a63 | 2569 | ex_ee_len = ext4_ext_get_actual_len(ex); |
a86c6181 AT |
2570 | } |
2571 | ||
2572 | if (correct_index && eh->eh_entries) | |
2573 | err = ext4_ext_correct_indexes(handle, inode, path); | |
2574 | ||
0aa06000 TT |
2575 | /* |
2576 | * If there is still a entry in the leaf node, check to see if | |
2577 | * it references the partial cluster. This is the only place | |
2578 | * where it could; if it doesn't, we can free the cluster. | |
2579 | */ | |
2580 | if (*partial_cluster && ex >= EXT_FIRST_EXTENT(eh) && | |
2581 | (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) != | |
2582 | *partial_cluster)) { | |
2583 | int flags = EXT4_FREE_BLOCKS_FORGET; | |
2584 | ||
2585 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) | |
2586 | flags |= EXT4_FREE_BLOCKS_METADATA; | |
2587 | ||
2588 | ext4_free_blocks(handle, inode, NULL, | |
2589 | EXT4_C2B(sbi, *partial_cluster), | |
2590 | sbi->s_cluster_ratio, flags); | |
2591 | *partial_cluster = 0; | |
2592 | } | |
2593 | ||
a86c6181 AT |
2594 | /* if this leaf is free, then we should |
2595 | * remove it from index block above */ | |
2596 | if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL) | |
2597 | err = ext4_ext_rm_idx(handle, inode, path + depth); | |
2598 | ||
2599 | out: | |
2600 | return err; | |
2601 | } | |
2602 | ||
2603 | /* | |
d0d856e8 RD |
2604 | * ext4_ext_more_to_rm: |
2605 | * returns 1 if current index has to be freed (even partial) | |
a86c6181 | 2606 | */ |
09b88252 | 2607 | static int |
a86c6181 AT |
2608 | ext4_ext_more_to_rm(struct ext4_ext_path *path) |
2609 | { | |
2610 | BUG_ON(path->p_idx == NULL); | |
2611 | ||
2612 | if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr)) | |
2613 | return 0; | |
2614 | ||
2615 | /* | |
d0d856e8 | 2616 | * if truncate on deeper level happened, it wasn't partial, |
a86c6181 AT |
2617 | * so we have to consider current index for truncation |
2618 | */ | |
2619 | if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block) | |
2620 | return 0; | |
2621 | return 1; | |
2622 | } | |
2623 | ||
5f95d21f LC |
2624 | static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
2625 | ext4_lblk_t end) | |
a86c6181 AT |
2626 | { |
2627 | struct super_block *sb = inode->i_sb; | |
2628 | int depth = ext_depth(inode); | |
968dee77 | 2629 | struct ext4_ext_path *path = NULL; |
0aa06000 | 2630 | ext4_fsblk_t partial_cluster = 0; |
a86c6181 | 2631 | handle_t *handle; |
6f2080e6 | 2632 | int i = 0, err = 0; |
a86c6181 | 2633 | |
5f95d21f | 2634 | ext_debug("truncate since %u to %u\n", start, end); |
a86c6181 AT |
2635 | |
2636 | /* probably first extent we're gonna free will be last in block */ | |
2637 | handle = ext4_journal_start(inode, depth + 1); | |
2638 | if (IS_ERR(handle)) | |
2639 | return PTR_ERR(handle); | |
2640 | ||
0617b83f | 2641 | again: |
a86c6181 AT |
2642 | ext4_ext_invalidate_cache(inode); |
2643 | ||
d8990240 AK |
2644 | trace_ext4_ext_remove_space(inode, start, depth); |
2645 | ||
5f95d21f LC |
2646 | /* |
2647 | * Check if we are removing extents inside the extent tree. If that | |
2648 | * is the case, we are going to punch a hole inside the extent tree | |
2649 | * so we have to check whether we need to split the extent covering | |
2650 | * the last block to remove so we can easily remove the part of it | |
2651 | * in ext4_ext_rm_leaf(). | |
2652 | */ | |
2653 | if (end < EXT_MAX_BLOCKS - 1) { | |
2654 | struct ext4_extent *ex; | |
2655 | ext4_lblk_t ee_block; | |
2656 | ||
2657 | /* find extent for this block */ | |
2658 | path = ext4_ext_find_extent(inode, end, NULL); | |
2659 | if (IS_ERR(path)) { | |
2660 | ext4_journal_stop(handle); | |
2661 | return PTR_ERR(path); | |
2662 | } | |
2663 | depth = ext_depth(inode); | |
6f2080e6 | 2664 | /* Leaf not may not exist only if inode has no blocks at all */ |
5f95d21f | 2665 | ex = path[depth].p_ext; |
968dee77 | 2666 | if (!ex) { |
6f2080e6 DM |
2667 | if (depth) { |
2668 | EXT4_ERROR_INODE(inode, | |
2669 | "path[%d].p_hdr == NULL", | |
2670 | depth); | |
2671 | err = -EIO; | |
2672 | } | |
2673 | goto out; | |
968dee77 | 2674 | } |
5f95d21f LC |
2675 | |
2676 | ee_block = le32_to_cpu(ex->ee_block); | |
2677 | ||
2678 | /* | |
2679 | * See if the last block is inside the extent, if so split | |
2680 | * the extent at 'end' block so we can easily remove the | |
2681 | * tail of the first part of the split extent in | |
2682 | * ext4_ext_rm_leaf(). | |
2683 | */ | |
2684 | if (end >= ee_block && | |
2685 | end < ee_block + ext4_ext_get_actual_len(ex) - 1) { | |
2686 | int split_flag = 0; | |
2687 | ||
2688 | if (ext4_ext_is_uninitialized(ex)) | |
2689 | split_flag = EXT4_EXT_MARK_UNINIT1 | | |
2690 | EXT4_EXT_MARK_UNINIT2; | |
2691 | ||
2692 | /* | |
2693 | * Split the extent in two so that 'end' is the last | |
2694 | * block in the first new extent | |
2695 | */ | |
2696 | err = ext4_split_extent_at(handle, inode, path, | |
2697 | end + 1, split_flag, | |
2698 | EXT4_GET_BLOCKS_PRE_IO | | |
2699 | EXT4_GET_BLOCKS_PUNCH_OUT_EXT); | |
2700 | ||
2701 | if (err < 0) | |
2702 | goto out; | |
2703 | } | |
5f95d21f | 2704 | } |
a86c6181 | 2705 | /* |
d0d856e8 RD |
2706 | * We start scanning from right side, freeing all the blocks |
2707 | * after i_size and walking into the tree depth-wise. | |
a86c6181 | 2708 | */ |
0617b83f | 2709 | depth = ext_depth(inode); |
968dee77 AS |
2710 | if (path) { |
2711 | int k = i = depth; | |
2712 | while (--k > 0) | |
2713 | path[k].p_block = | |
2714 | le16_to_cpu(path[k].p_hdr->eh_entries)+1; | |
2715 | } else { | |
2716 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), | |
2717 | GFP_NOFS); | |
2718 | if (path == NULL) { | |
2719 | ext4_journal_stop(handle); | |
2720 | return -ENOMEM; | |
2721 | } | |
2722 | path[0].p_depth = depth; | |
2723 | path[0].p_hdr = ext_inode_hdr(inode); | |
89a4e48f | 2724 | i = 0; |
5f95d21f | 2725 | |
968dee77 AS |
2726 | if (ext4_ext_check(inode, path[0].p_hdr, depth)) { |
2727 | err = -EIO; | |
2728 | goto out; | |
2729 | } | |
a86c6181 | 2730 | } |
968dee77 | 2731 | err = 0; |
a86c6181 AT |
2732 | |
2733 | while (i >= 0 && err == 0) { | |
2734 | if (i == depth) { | |
2735 | /* this is leaf block */ | |
d583fb87 | 2736 | err = ext4_ext_rm_leaf(handle, inode, path, |
0aa06000 | 2737 | &partial_cluster, start, |
5f95d21f | 2738 | end); |
d0d856e8 | 2739 | /* root level has p_bh == NULL, brelse() eats this */ |
a86c6181 AT |
2740 | brelse(path[i].p_bh); |
2741 | path[i].p_bh = NULL; | |
2742 | i--; | |
2743 | continue; | |
2744 | } | |
2745 | ||
2746 | /* this is index block */ | |
2747 | if (!path[i].p_hdr) { | |
2748 | ext_debug("initialize header\n"); | |
2749 | path[i].p_hdr = ext_block_hdr(path[i].p_bh); | |
a86c6181 AT |
2750 | } |
2751 | ||
a86c6181 | 2752 | if (!path[i].p_idx) { |
d0d856e8 | 2753 | /* this level hasn't been touched yet */ |
a86c6181 AT |
2754 | path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr); |
2755 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1; | |
2756 | ext_debug("init index ptr: hdr 0x%p, num %d\n", | |
2757 | path[i].p_hdr, | |
2758 | le16_to_cpu(path[i].p_hdr->eh_entries)); | |
2759 | } else { | |
d0d856e8 | 2760 | /* we were already here, see at next index */ |
a86c6181 AT |
2761 | path[i].p_idx--; |
2762 | } | |
2763 | ||
2764 | ext_debug("level %d - index, first 0x%p, cur 0x%p\n", | |
2765 | i, EXT_FIRST_INDEX(path[i].p_hdr), | |
2766 | path[i].p_idx); | |
2767 | if (ext4_ext_more_to_rm(path + i)) { | |
c29c0ae7 | 2768 | struct buffer_head *bh; |
a86c6181 | 2769 | /* go to the next level */ |
2ae02107 | 2770 | ext_debug("move to level %d (block %llu)\n", |
bf89d16f | 2771 | i + 1, ext4_idx_pblock(path[i].p_idx)); |
a86c6181 | 2772 | memset(path + i + 1, 0, sizeof(*path)); |
bf89d16f | 2773 | bh = sb_bread(sb, ext4_idx_pblock(path[i].p_idx)); |
c29c0ae7 | 2774 | if (!bh) { |
a86c6181 AT |
2775 | /* should we reset i_size? */ |
2776 | err = -EIO; | |
2777 | break; | |
2778 | } | |
c29c0ae7 AT |
2779 | if (WARN_ON(i + 1 > depth)) { |
2780 | err = -EIO; | |
2781 | break; | |
2782 | } | |
f8489128 DW |
2783 | if (ext4_ext_check_block(inode, ext_block_hdr(bh), |
2784 | depth - i - 1, bh)) { | |
c29c0ae7 AT |
2785 | err = -EIO; |
2786 | break; | |
2787 | } | |
2788 | path[i + 1].p_bh = bh; | |
a86c6181 | 2789 | |
d0d856e8 RD |
2790 | /* save actual number of indexes since this |
2791 | * number is changed at the next iteration */ | |
a86c6181 AT |
2792 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries); |
2793 | i++; | |
2794 | } else { | |
d0d856e8 | 2795 | /* we finished processing this index, go up */ |
a86c6181 | 2796 | if (path[i].p_hdr->eh_entries == 0 && i > 0) { |
d0d856e8 | 2797 | /* index is empty, remove it; |
a86c6181 AT |
2798 | * handle must be already prepared by the |
2799 | * truncatei_leaf() */ | |
2800 | err = ext4_ext_rm_idx(handle, inode, path + i); | |
2801 | } | |
d0d856e8 | 2802 | /* root level has p_bh == NULL, brelse() eats this */ |
a86c6181 AT |
2803 | brelse(path[i].p_bh); |
2804 | path[i].p_bh = NULL; | |
2805 | i--; | |
2806 | ext_debug("return to level %d\n", i); | |
2807 | } | |
2808 | } | |
2809 | ||
d8990240 AK |
2810 | trace_ext4_ext_remove_space_done(inode, start, depth, partial_cluster, |
2811 | path->p_hdr->eh_entries); | |
2812 | ||
7b415bf6 AK |
2813 | /* If we still have something in the partial cluster and we have removed |
2814 | * even the first extent, then we should free the blocks in the partial | |
2815 | * cluster as well. */ | |
2816 | if (partial_cluster && path->p_hdr->eh_entries == 0) { | |
2817 | int flags = EXT4_FREE_BLOCKS_FORGET; | |
2818 | ||
2819 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) | |
2820 | flags |= EXT4_FREE_BLOCKS_METADATA; | |
2821 | ||
2822 | ext4_free_blocks(handle, inode, NULL, | |
2823 | EXT4_C2B(EXT4_SB(sb), partial_cluster), | |
2824 | EXT4_SB(sb)->s_cluster_ratio, flags); | |
2825 | partial_cluster = 0; | |
2826 | } | |
2827 | ||
a86c6181 AT |
2828 | /* TODO: flexible tree reduction should be here */ |
2829 | if (path->p_hdr->eh_entries == 0) { | |
2830 | /* | |
d0d856e8 RD |
2831 | * truncate to zero freed all the tree, |
2832 | * so we need to correct eh_depth | |
a86c6181 AT |
2833 | */ |
2834 | err = ext4_ext_get_access(handle, inode, path); | |
2835 | if (err == 0) { | |
2836 | ext_inode_hdr(inode)->eh_depth = 0; | |
2837 | ext_inode_hdr(inode)->eh_max = | |
55ad63bf | 2838 | cpu_to_le16(ext4_ext_space_root(inode, 0)); |
a86c6181 AT |
2839 | err = ext4_ext_dirty(handle, inode, path); |
2840 | } | |
2841 | } | |
2842 | out: | |
a86c6181 AT |
2843 | ext4_ext_drop_refs(path); |
2844 | kfree(path); | |
968dee77 AS |
2845 | if (err == -EAGAIN) { |
2846 | path = NULL; | |
0617b83f | 2847 | goto again; |
968dee77 | 2848 | } |
a86c6181 AT |
2849 | ext4_journal_stop(handle); |
2850 | ||
2851 | return err; | |
2852 | } | |
2853 | ||
2854 | /* | |
2855 | * called at mount time | |
2856 | */ | |
2857 | void ext4_ext_init(struct super_block *sb) | |
2858 | { | |
2859 | /* | |
2860 | * possible initialization would be here | |
2861 | */ | |
2862 | ||
83982b6f | 2863 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
90576c0b | 2864 | #if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS) |
92b97816 | 2865 | printk(KERN_INFO "EXT4-fs: file extents enabled" |
bbf2f9fb | 2866 | #ifdef AGGRESSIVE_TEST |
92b97816 | 2867 | ", aggressive tests" |
a86c6181 AT |
2868 | #endif |
2869 | #ifdef CHECK_BINSEARCH | |
92b97816 | 2870 | ", check binsearch" |
a86c6181 AT |
2871 | #endif |
2872 | #ifdef EXTENTS_STATS | |
92b97816 | 2873 | ", stats" |
a86c6181 | 2874 | #endif |
92b97816 | 2875 | "\n"); |
90576c0b | 2876 | #endif |
a86c6181 AT |
2877 | #ifdef EXTENTS_STATS |
2878 | spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock); | |
2879 | EXT4_SB(sb)->s_ext_min = 1 << 30; | |
2880 | EXT4_SB(sb)->s_ext_max = 0; | |
2881 | #endif | |
2882 | } | |
2883 | } | |
2884 | ||
2885 | /* | |
2886 | * called at umount time | |
2887 | */ | |
2888 | void ext4_ext_release(struct super_block *sb) | |
2889 | { | |
83982b6f | 2890 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
a86c6181 AT |
2891 | return; |
2892 | ||
2893 | #ifdef EXTENTS_STATS | |
2894 | if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) { | |
2895 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2896 | printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n", | |
2897 | sbi->s_ext_blocks, sbi->s_ext_extents, | |
2898 | sbi->s_ext_blocks / sbi->s_ext_extents); | |
2899 | printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n", | |
2900 | sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max); | |
2901 | } | |
2902 | #endif | |
2903 | } | |
2904 | ||
093a088b AK |
2905 | /* FIXME!! we need to try to merge to left or right after zero-out */ |
2906 | static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex) | |
2907 | { | |
2407518d LC |
2908 | ext4_fsblk_t ee_pblock; |
2909 | unsigned int ee_len; | |
b720303d | 2910 | int ret; |
093a088b | 2911 | |
093a088b | 2912 | ee_len = ext4_ext_get_actual_len(ex); |
bf89d16f | 2913 | ee_pblock = ext4_ext_pblock(ex); |
b720303d | 2914 | |
a107e5a3 | 2915 | ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS); |
2407518d LC |
2916 | if (ret > 0) |
2917 | ret = 0; | |
093a088b | 2918 | |
2407518d | 2919 | return ret; |
093a088b AK |
2920 | } |
2921 | ||
47ea3bb5 YY |
2922 | /* |
2923 | * ext4_split_extent_at() splits an extent at given block. | |
2924 | * | |
2925 | * @handle: the journal handle | |
2926 | * @inode: the file inode | |
2927 | * @path: the path to the extent | |
2928 | * @split: the logical block where the extent is splitted. | |
2929 | * @split_flags: indicates if the extent could be zeroout if split fails, and | |
2930 | * the states(init or uninit) of new extents. | |
2931 | * @flags: flags used to insert new extent to extent tree. | |
2932 | * | |
2933 | * | |
2934 | * Splits extent [a, b] into two extents [a, @split) and [@split, b], states | |
2935 | * of which are deterimined by split_flag. | |
2936 | * | |
2937 | * There are two cases: | |
2938 | * a> the extent are splitted into two extent. | |
2939 | * b> split is not needed, and just mark the extent. | |
2940 | * | |
2941 | * return 0 on success. | |
2942 | */ | |
2943 | static int ext4_split_extent_at(handle_t *handle, | |
2944 | struct inode *inode, | |
2945 | struct ext4_ext_path *path, | |
2946 | ext4_lblk_t split, | |
2947 | int split_flag, | |
2948 | int flags) | |
2949 | { | |
2950 | ext4_fsblk_t newblock; | |
2951 | ext4_lblk_t ee_block; | |
2952 | struct ext4_extent *ex, newex, orig_ex; | |
2953 | struct ext4_extent *ex2 = NULL; | |
2954 | unsigned int ee_len, depth; | |
2955 | int err = 0; | |
2956 | ||
dee1f973 DM |
2957 | BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) == |
2958 | (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)); | |
2959 | ||
47ea3bb5 YY |
2960 | ext_debug("ext4_split_extents_at: inode %lu, logical" |
2961 | "block %llu\n", inode->i_ino, (unsigned long long)split); | |
2962 | ||
2963 | ext4_ext_show_leaf(inode, path); | |
2964 | ||
2965 | depth = ext_depth(inode); | |
2966 | ex = path[depth].p_ext; | |
2967 | ee_block = le32_to_cpu(ex->ee_block); | |
2968 | ee_len = ext4_ext_get_actual_len(ex); | |
2969 | newblock = split - ee_block + ext4_ext_pblock(ex); | |
2970 | ||
2971 | BUG_ON(split < ee_block || split >= (ee_block + ee_len)); | |
2972 | ||
2973 | err = ext4_ext_get_access(handle, inode, path + depth); | |
2974 | if (err) | |
2975 | goto out; | |
2976 | ||
2977 | if (split == ee_block) { | |
2978 | /* | |
2979 | * case b: block @split is the block that the extent begins with | |
2980 | * then we just change the state of the extent, and splitting | |
2981 | * is not needed. | |
2982 | */ | |
2983 | if (split_flag & EXT4_EXT_MARK_UNINIT2) | |
2984 | ext4_ext_mark_uninitialized(ex); | |
2985 | else | |
2986 | ext4_ext_mark_initialized(ex); | |
2987 | ||
2988 | if (!(flags & EXT4_GET_BLOCKS_PRE_IO)) | |
ecb94f5f | 2989 | ext4_ext_try_to_merge(handle, inode, path, ex); |
47ea3bb5 | 2990 | |
ecb94f5f | 2991 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
47ea3bb5 YY |
2992 | goto out; |
2993 | } | |
2994 | ||
2995 | /* case a */ | |
2996 | memcpy(&orig_ex, ex, sizeof(orig_ex)); | |
2997 | ex->ee_len = cpu_to_le16(split - ee_block); | |
2998 | if (split_flag & EXT4_EXT_MARK_UNINIT1) | |
2999 | ext4_ext_mark_uninitialized(ex); | |
3000 | ||
3001 | /* | |
3002 | * path may lead to new leaf, not to original leaf any more | |
3003 | * after ext4_ext_insert_extent() returns, | |
3004 | */ | |
3005 | err = ext4_ext_dirty(handle, inode, path + depth); | |
3006 | if (err) | |
3007 | goto fix_extent_len; | |
3008 | ||
3009 | ex2 = &newex; | |
3010 | ex2->ee_block = cpu_to_le32(split); | |
3011 | ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block)); | |
3012 | ext4_ext_store_pblock(ex2, newblock); | |
3013 | if (split_flag & EXT4_EXT_MARK_UNINIT2) | |
3014 | ext4_ext_mark_uninitialized(ex2); | |
3015 | ||
3016 | err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); | |
3017 | if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) { | |
dee1f973 DM |
3018 | if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) { |
3019 | if (split_flag & EXT4_EXT_DATA_VALID1) | |
3020 | err = ext4_ext_zeroout(inode, ex2); | |
3021 | else | |
3022 | err = ext4_ext_zeroout(inode, ex); | |
3023 | } else | |
3024 | err = ext4_ext_zeroout(inode, &orig_ex); | |
3025 | ||
47ea3bb5 YY |
3026 | if (err) |
3027 | goto fix_extent_len; | |
3028 | /* update the extent length and mark as initialized */ | |
af1584f5 | 3029 | ex->ee_len = cpu_to_le16(ee_len); |
ecb94f5f TT |
3030 | ext4_ext_try_to_merge(handle, inode, path, ex); |
3031 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); | |
47ea3bb5 YY |
3032 | goto out; |
3033 | } else if (err) | |
3034 | goto fix_extent_len; | |
3035 | ||
3036 | out: | |
3037 | ext4_ext_show_leaf(inode, path); | |
3038 | return err; | |
3039 | ||
3040 | fix_extent_len: | |
3041 | ex->ee_len = orig_ex.ee_len; | |
3042 | ext4_ext_dirty(handle, inode, path + depth); | |
3043 | return err; | |
3044 | } | |
3045 | ||
3046 | /* | |
3047 | * ext4_split_extents() splits an extent and mark extent which is covered | |
3048 | * by @map as split_flags indicates | |
3049 | * | |
3050 | * It may result in splitting the extent into multiple extents (upto three) | |
3051 | * There are three possibilities: | |
3052 | * a> There is no split required | |
3053 | * b> Splits in two extents: Split is happening at either end of the extent | |
3054 | * c> Splits in three extents: Somone is splitting in middle of the extent | |
3055 | * | |
3056 | */ | |
3057 | static int ext4_split_extent(handle_t *handle, | |
3058 | struct inode *inode, | |
3059 | struct ext4_ext_path *path, | |
3060 | struct ext4_map_blocks *map, | |
3061 | int split_flag, | |
3062 | int flags) | |
3063 | { | |
3064 | ext4_lblk_t ee_block; | |
3065 | struct ext4_extent *ex; | |
3066 | unsigned int ee_len, depth; | |
3067 | int err = 0; | |
3068 | int uninitialized; | |
3069 | int split_flag1, flags1; | |
3070 | ||
3071 | depth = ext_depth(inode); | |
3072 | ex = path[depth].p_ext; | |
3073 | ee_block = le32_to_cpu(ex->ee_block); | |
3074 | ee_len = ext4_ext_get_actual_len(ex); | |
3075 | uninitialized = ext4_ext_is_uninitialized(ex); | |
3076 | ||
3077 | if (map->m_lblk + map->m_len < ee_block + ee_len) { | |
dee1f973 | 3078 | split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT; |
47ea3bb5 YY |
3079 | flags1 = flags | EXT4_GET_BLOCKS_PRE_IO; |
3080 | if (uninitialized) | |
3081 | split_flag1 |= EXT4_EXT_MARK_UNINIT1 | | |
3082 | EXT4_EXT_MARK_UNINIT2; | |
dee1f973 DM |
3083 | if (split_flag & EXT4_EXT_DATA_VALID2) |
3084 | split_flag1 |= EXT4_EXT_DATA_VALID1; | |
47ea3bb5 YY |
3085 | err = ext4_split_extent_at(handle, inode, path, |
3086 | map->m_lblk + map->m_len, split_flag1, flags1); | |
93917411 YY |
3087 | if (err) |
3088 | goto out; | |
47ea3bb5 YY |
3089 | } |
3090 | ||
3091 | ext4_ext_drop_refs(path); | |
3092 | path = ext4_ext_find_extent(inode, map->m_lblk, path); | |
3093 | if (IS_ERR(path)) | |
3094 | return PTR_ERR(path); | |
3095 | ||
3096 | if (map->m_lblk >= ee_block) { | |
dee1f973 DM |
3097 | split_flag1 = split_flag & (EXT4_EXT_MAY_ZEROOUT | |
3098 | EXT4_EXT_DATA_VALID2); | |
47ea3bb5 YY |
3099 | if (uninitialized) |
3100 | split_flag1 |= EXT4_EXT_MARK_UNINIT1; | |
3101 | if (split_flag & EXT4_EXT_MARK_UNINIT2) | |
3102 | split_flag1 |= EXT4_EXT_MARK_UNINIT2; | |
3103 | err = ext4_split_extent_at(handle, inode, path, | |
3104 | map->m_lblk, split_flag1, flags); | |
3105 | if (err) | |
3106 | goto out; | |
3107 | } | |
3108 | ||
3109 | ext4_ext_show_leaf(inode, path); | |
3110 | out: | |
3111 | return err ? err : map->m_len; | |
3112 | } | |
3113 | ||
56055d3a | 3114 | /* |
e35fd660 | 3115 | * This function is called by ext4_ext_map_blocks() if someone tries to write |
56055d3a | 3116 | * to an uninitialized extent. It may result in splitting the uninitialized |
25985edc | 3117 | * extent into multiple extents (up to three - one initialized and two |
56055d3a AA |
3118 | * uninitialized). |
3119 | * There are three possibilities: | |
3120 | * a> There is no split required: Entire extent should be initialized | |
3121 | * b> Splits in two extents: Write is happening at either end of the extent | |
3122 | * c> Splits in three extents: Somone is writing in middle of the extent | |
6f91bc5f EG |
3123 | * |
3124 | * Pre-conditions: | |
3125 | * - The extent pointed to by 'path' is uninitialized. | |
3126 | * - The extent pointed to by 'path' contains a superset | |
3127 | * of the logical span [map->m_lblk, map->m_lblk + map->m_len). | |
3128 | * | |
3129 | * Post-conditions on success: | |
3130 | * - the returned value is the number of blocks beyond map->l_lblk | |
3131 | * that are allocated and initialized. | |
3132 | * It is guaranteed to be >= map->m_len. | |
56055d3a | 3133 | */ |
725d26d3 | 3134 | static int ext4_ext_convert_to_initialized(handle_t *handle, |
e35fd660 TT |
3135 | struct inode *inode, |
3136 | struct ext4_map_blocks *map, | |
3137 | struct ext4_ext_path *path) | |
56055d3a | 3138 | { |
67a5da56 | 3139 | struct ext4_sb_info *sbi; |
6f91bc5f | 3140 | struct ext4_extent_header *eh; |
667eff35 YY |
3141 | struct ext4_map_blocks split_map; |
3142 | struct ext4_extent zero_ex; | |
3143 | struct ext4_extent *ex; | |
21ca087a | 3144 | ext4_lblk_t ee_block, eof_block; |
f85b287a | 3145 | unsigned int ee_len, depth; |
67a5da56 | 3146 | int allocated, max_zeroout = 0; |
56055d3a | 3147 | int err = 0; |
667eff35 | 3148 | int split_flag = 0; |
21ca087a DM |
3149 | |
3150 | ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical" | |
3151 | "block %llu, max_blocks %u\n", inode->i_ino, | |
e35fd660 | 3152 | (unsigned long long)map->m_lblk, map->m_len); |
21ca087a | 3153 | |
67a5da56 | 3154 | sbi = EXT4_SB(inode->i_sb); |
21ca087a DM |
3155 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
3156 | inode->i_sb->s_blocksize_bits; | |
e35fd660 TT |
3157 | if (eof_block < map->m_lblk + map->m_len) |
3158 | eof_block = map->m_lblk + map->m_len; | |
56055d3a AA |
3159 | |
3160 | depth = ext_depth(inode); | |
6f91bc5f | 3161 | eh = path[depth].p_hdr; |
56055d3a AA |
3162 | ex = path[depth].p_ext; |
3163 | ee_block = le32_to_cpu(ex->ee_block); | |
3164 | ee_len = ext4_ext_get_actual_len(ex); | |
e35fd660 | 3165 | allocated = ee_len - (map->m_lblk - ee_block); |
56055d3a | 3166 | |
6f91bc5f EG |
3167 | trace_ext4_ext_convert_to_initialized_enter(inode, map, ex); |
3168 | ||
3169 | /* Pre-conditions */ | |
3170 | BUG_ON(!ext4_ext_is_uninitialized(ex)); | |
3171 | BUG_ON(!in_range(map->m_lblk, ee_block, ee_len)); | |
6f91bc5f EG |
3172 | |
3173 | /* | |
3174 | * Attempt to transfer newly initialized blocks from the currently | |
3175 | * uninitialized extent to its left neighbor. This is much cheaper | |
3176 | * than an insertion followed by a merge as those involve costly | |
3177 | * memmove() calls. This is the common case in steady state for | |
3178 | * workloads doing fallocate(FALLOC_FL_KEEP_SIZE) followed by append | |
3179 | * writes. | |
3180 | * | |
3181 | * Limitations of the current logic: | |
3182 | * - L1: we only deal with writes at the start of the extent. | |
3183 | * The approach could be extended to writes at the end | |
3184 | * of the extent but this scenario was deemed less common. | |
3185 | * - L2: we do not deal with writes covering the whole extent. | |
3186 | * This would require removing the extent if the transfer | |
3187 | * is possible. | |
3188 | * - L3: we only attempt to merge with an extent stored in the | |
3189 | * same extent tree node. | |
3190 | */ | |
3191 | if ((map->m_lblk == ee_block) && /*L1*/ | |
3192 | (map->m_len < ee_len) && /*L2*/ | |
3193 | (ex > EXT_FIRST_EXTENT(eh))) { /*L3*/ | |
3194 | struct ext4_extent *prev_ex; | |
3195 | ext4_lblk_t prev_lblk; | |
3196 | ext4_fsblk_t prev_pblk, ee_pblk; | |
3197 | unsigned int prev_len, write_len; | |
3198 | ||
3199 | prev_ex = ex - 1; | |
3200 | prev_lblk = le32_to_cpu(prev_ex->ee_block); | |
3201 | prev_len = ext4_ext_get_actual_len(prev_ex); | |
3202 | prev_pblk = ext4_ext_pblock(prev_ex); | |
3203 | ee_pblk = ext4_ext_pblock(ex); | |
3204 | write_len = map->m_len; | |
3205 | ||
3206 | /* | |
3207 | * A transfer of blocks from 'ex' to 'prev_ex' is allowed | |
3208 | * upon those conditions: | |
3209 | * - C1: prev_ex is initialized, | |
3210 | * - C2: prev_ex is logically abutting ex, | |
3211 | * - C3: prev_ex is physically abutting ex, | |
3212 | * - C4: prev_ex can receive the additional blocks without | |
3213 | * overflowing the (initialized) length limit. | |
3214 | */ | |
3215 | if ((!ext4_ext_is_uninitialized(prev_ex)) && /*C1*/ | |
3216 | ((prev_lblk + prev_len) == ee_block) && /*C2*/ | |
3217 | ((prev_pblk + prev_len) == ee_pblk) && /*C3*/ | |
3218 | (prev_len < (EXT_INIT_MAX_LEN - write_len))) { /*C4*/ | |
3219 | err = ext4_ext_get_access(handle, inode, path + depth); | |
3220 | if (err) | |
3221 | goto out; | |
3222 | ||
3223 | trace_ext4_ext_convert_to_initialized_fastpath(inode, | |
3224 | map, ex, prev_ex); | |
3225 | ||
3226 | /* Shift the start of ex by 'write_len' blocks */ | |
3227 | ex->ee_block = cpu_to_le32(ee_block + write_len); | |
3228 | ext4_ext_store_pblock(ex, ee_pblk + write_len); | |
3229 | ex->ee_len = cpu_to_le16(ee_len - write_len); | |
3230 | ext4_ext_mark_uninitialized(ex); /* Restore the flag */ | |
3231 | ||
3232 | /* Extend prev_ex by 'write_len' blocks */ | |
3233 | prev_ex->ee_len = cpu_to_le16(prev_len + write_len); | |
3234 | ||
3235 | /* Mark the block containing both extents as dirty */ | |
3236 | ext4_ext_dirty(handle, inode, path + depth); | |
3237 | ||
3238 | /* Update path to point to the right extent */ | |
3239 | path[depth].p_ext = prev_ex; | |
3240 | ||
3241 | /* Result: number of initialized blocks past m_lblk */ | |
3242 | allocated = write_len; | |
3243 | goto out; | |
3244 | } | |
3245 | } | |
3246 | ||
667eff35 | 3247 | WARN_ON(map->m_lblk < ee_block); |
21ca087a DM |
3248 | /* |
3249 | * It is safe to convert extent to initialized via explicit | |
3250 | * zeroout only if extent is fully insde i_size or new_size. | |
3251 | */ | |
667eff35 | 3252 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
21ca087a | 3253 | |
67a5da56 ZL |
3254 | if (EXT4_EXT_MAY_ZEROOUT & split_flag) |
3255 | max_zeroout = sbi->s_extent_max_zeroout_kb >> | |
3256 | inode->i_sb->s_blocksize_bits; | |
3257 | ||
3258 | /* If extent is less than s_max_zeroout_kb, zeroout directly */ | |
3259 | if (max_zeroout && (ee_len <= max_zeroout)) { | |
667eff35 | 3260 | err = ext4_ext_zeroout(inode, ex); |
3977c965 | 3261 | if (err) |
d03856bd | 3262 | goto out; |
d03856bd AK |
3263 | |
3264 | err = ext4_ext_get_access(handle, inode, path + depth); | |
3265 | if (err) | |
3266 | goto out; | |
667eff35 | 3267 | ext4_ext_mark_initialized(ex); |
ecb94f5f TT |
3268 | ext4_ext_try_to_merge(handle, inode, path, ex); |
3269 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); | |
667eff35 | 3270 | goto out; |
56055d3a | 3271 | } |
667eff35 | 3272 | |
56055d3a | 3273 | /* |
667eff35 YY |
3274 | * four cases: |
3275 | * 1. split the extent into three extents. | |
3276 | * 2. split the extent into two extents, zeroout the first half. | |
3277 | * 3. split the extent into two extents, zeroout the second half. | |
3278 | * 4. split the extent into two extents with out zeroout. | |
56055d3a | 3279 | */ |
667eff35 YY |
3280 | split_map.m_lblk = map->m_lblk; |
3281 | split_map.m_len = map->m_len; | |
3282 | ||
67a5da56 ZL |
3283 | if (max_zeroout && (allocated > map->m_len)) { |
3284 | if (allocated <= max_zeroout) { | |
667eff35 YY |
3285 | /* case 3 */ |
3286 | zero_ex.ee_block = | |
9b940f8e AH |
3287 | cpu_to_le32(map->m_lblk); |
3288 | zero_ex.ee_len = cpu_to_le16(allocated); | |
667eff35 YY |
3289 | ext4_ext_store_pblock(&zero_ex, |
3290 | ext4_ext_pblock(ex) + map->m_lblk - ee_block); | |
3291 | err = ext4_ext_zeroout(inode, &zero_ex); | |
56055d3a AA |
3292 | if (err) |
3293 | goto out; | |
667eff35 YY |
3294 | split_map.m_lblk = map->m_lblk; |
3295 | split_map.m_len = allocated; | |
67a5da56 | 3296 | } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) { |
667eff35 YY |
3297 | /* case 2 */ |
3298 | if (map->m_lblk != ee_block) { | |
3299 | zero_ex.ee_block = ex->ee_block; | |
3300 | zero_ex.ee_len = cpu_to_le16(map->m_lblk - | |
3301 | ee_block); | |
3302 | ext4_ext_store_pblock(&zero_ex, | |
3303 | ext4_ext_pblock(ex)); | |
3304 | err = ext4_ext_zeroout(inode, &zero_ex); | |
3305 | if (err) | |
3306 | goto out; | |
3307 | } | |
3308 | ||
667eff35 | 3309 | split_map.m_lblk = ee_block; |
9b940f8e AH |
3310 | split_map.m_len = map->m_lblk - ee_block + map->m_len; |
3311 | allocated = map->m_len; | |
56055d3a AA |
3312 | } |
3313 | } | |
667eff35 YY |
3314 | |
3315 | allocated = ext4_split_extent(handle, inode, path, | |
67a5da56 | 3316 | &split_map, split_flag, 0); |
667eff35 YY |
3317 | if (allocated < 0) |
3318 | err = allocated; | |
3319 | ||
56055d3a AA |
3320 | out: |
3321 | return err ? err : allocated; | |
3322 | } | |
3323 | ||
0031462b | 3324 | /* |
e35fd660 | 3325 | * This function is called by ext4_ext_map_blocks() from |
0031462b MC |
3326 | * ext4_get_blocks_dio_write() when DIO to write |
3327 | * to an uninitialized extent. | |
3328 | * | |
fd018fe8 | 3329 | * Writing to an uninitialized extent may result in splitting the uninitialized |
30cb27d6 | 3330 | * extent into multiple initialized/uninitialized extents (up to three) |
0031462b MC |
3331 | * There are three possibilities: |
3332 | * a> There is no split required: Entire extent should be uninitialized | |
3333 | * b> Splits in two extents: Write is happening at either end of the extent | |
3334 | * c> Splits in three extents: Somone is writing in middle of the extent | |
3335 | * | |
3336 | * One of more index blocks maybe needed if the extent tree grow after | |
b595076a | 3337 | * the uninitialized extent split. To prevent ENOSPC occur at the IO |
0031462b | 3338 | * complete, we need to split the uninitialized extent before DIO submit |
421f91d2 | 3339 | * the IO. The uninitialized extent called at this time will be split |
0031462b MC |
3340 | * into three uninitialized extent(at most). After IO complete, the part |
3341 | * being filled will be convert to initialized by the end_io callback function | |
3342 | * via ext4_convert_unwritten_extents(). | |
ba230c3f M |
3343 | * |
3344 | * Returns the size of uninitialized extent to be written on success. | |
0031462b MC |
3345 | */ |
3346 | static int ext4_split_unwritten_extents(handle_t *handle, | |
3347 | struct inode *inode, | |
e35fd660 | 3348 | struct ext4_map_blocks *map, |
0031462b | 3349 | struct ext4_ext_path *path, |
0031462b MC |
3350 | int flags) |
3351 | { | |
667eff35 YY |
3352 | ext4_lblk_t eof_block; |
3353 | ext4_lblk_t ee_block; | |
3354 | struct ext4_extent *ex; | |
3355 | unsigned int ee_len; | |
3356 | int split_flag = 0, depth; | |
21ca087a DM |
3357 | |
3358 | ext_debug("ext4_split_unwritten_extents: inode %lu, logical" | |
3359 | "block %llu, max_blocks %u\n", inode->i_ino, | |
e35fd660 | 3360 | (unsigned long long)map->m_lblk, map->m_len); |
21ca087a DM |
3361 | |
3362 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> | |
3363 | inode->i_sb->s_blocksize_bits; | |
e35fd660 TT |
3364 | if (eof_block < map->m_lblk + map->m_len) |
3365 | eof_block = map->m_lblk + map->m_len; | |
21ca087a DM |
3366 | /* |
3367 | * It is safe to convert extent to initialized via explicit | |
3368 | * zeroout only if extent is fully insde i_size or new_size. | |
3369 | */ | |
667eff35 YY |
3370 | depth = ext_depth(inode); |
3371 | ex = path[depth].p_ext; | |
3372 | ee_block = le32_to_cpu(ex->ee_block); | |
3373 | ee_len = ext4_ext_get_actual_len(ex); | |
0031462b | 3374 | |
667eff35 YY |
3375 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
3376 | split_flag |= EXT4_EXT_MARK_UNINIT2; | |
dee1f973 DM |
3377 | if (flags & EXT4_GET_BLOCKS_CONVERT) |
3378 | split_flag |= EXT4_EXT_DATA_VALID2; | |
667eff35 YY |
3379 | flags |= EXT4_GET_BLOCKS_PRE_IO; |
3380 | return ext4_split_extent(handle, inode, path, map, split_flag, flags); | |
0031462b | 3381 | } |
197217a5 | 3382 | |
c7064ef1 | 3383 | static int ext4_convert_unwritten_extents_endio(handle_t *handle, |
dee1f973 DM |
3384 | struct inode *inode, |
3385 | struct ext4_map_blocks *map, | |
3386 | struct ext4_ext_path *path) | |
0031462b MC |
3387 | { |
3388 | struct ext4_extent *ex; | |
dee1f973 DM |
3389 | ext4_lblk_t ee_block; |
3390 | unsigned int ee_len; | |
0031462b MC |
3391 | int depth; |
3392 | int err = 0; | |
0031462b MC |
3393 | |
3394 | depth = ext_depth(inode); | |
0031462b | 3395 | ex = path[depth].p_ext; |
dee1f973 DM |
3396 | ee_block = le32_to_cpu(ex->ee_block); |
3397 | ee_len = ext4_ext_get_actual_len(ex); | |
0031462b | 3398 | |
197217a5 YY |
3399 | ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical" |
3400 | "block %llu, max_blocks %u\n", inode->i_ino, | |
dee1f973 DM |
3401 | (unsigned long long)ee_block, ee_len); |
3402 | ||
3403 | /* If extent is larger than requested then split is required */ | |
3404 | if (ee_block != map->m_lblk || ee_len > map->m_len) { | |
3405 | err = ext4_split_unwritten_extents(handle, inode, map, path, | |
3406 | EXT4_GET_BLOCKS_CONVERT); | |
3407 | if (err < 0) | |
3408 | goto out; | |
3409 | ext4_ext_drop_refs(path); | |
3410 | path = ext4_ext_find_extent(inode, map->m_lblk, path); | |
3411 | if (IS_ERR(path)) { | |
3412 | err = PTR_ERR(path); | |
3413 | goto out; | |
3414 | } | |
3415 | depth = ext_depth(inode); | |
3416 | ex = path[depth].p_ext; | |
3417 | } | |
197217a5 | 3418 | |
0031462b MC |
3419 | err = ext4_ext_get_access(handle, inode, path + depth); |
3420 | if (err) | |
3421 | goto out; | |
3422 | /* first mark the extent as initialized */ | |
3423 | ext4_ext_mark_initialized(ex); | |
3424 | ||
197217a5 YY |
3425 | /* note: ext4_ext_correct_indexes() isn't needed here because |
3426 | * borders are not changed | |
0031462b | 3427 | */ |
ecb94f5f | 3428 | ext4_ext_try_to_merge(handle, inode, path, ex); |
197217a5 | 3429 | |
0031462b | 3430 | /* Mark modified extent as dirty */ |
ecb94f5f | 3431 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
0031462b MC |
3432 | out: |
3433 | ext4_ext_show_leaf(inode, path); | |
3434 | return err; | |
3435 | } | |
3436 | ||
515f41c3 AK |
3437 | static void unmap_underlying_metadata_blocks(struct block_device *bdev, |
3438 | sector_t block, int count) | |
3439 | { | |
3440 | int i; | |
3441 | for (i = 0; i < count; i++) | |
3442 | unmap_underlying_metadata(bdev, block + i); | |
3443 | } | |
3444 | ||
58590b06 TT |
3445 | /* |
3446 | * Handle EOFBLOCKS_FL flag, clearing it if necessary | |
3447 | */ | |
3448 | static int check_eofblocks_fl(handle_t *handle, struct inode *inode, | |
d002ebf1 | 3449 | ext4_lblk_t lblk, |
58590b06 TT |
3450 | struct ext4_ext_path *path, |
3451 | unsigned int len) | |
3452 | { | |
3453 | int i, depth; | |
3454 | struct ext4_extent_header *eh; | |
65922cb5 | 3455 | struct ext4_extent *last_ex; |
58590b06 TT |
3456 | |
3457 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) | |
3458 | return 0; | |
3459 | ||
3460 | depth = ext_depth(inode); | |
3461 | eh = path[depth].p_hdr; | |
58590b06 | 3462 | |
afcff5d8 LC |
3463 | /* |
3464 | * We're going to remove EOFBLOCKS_FL entirely in future so we | |
3465 | * do not care for this case anymore. Simply remove the flag | |
3466 | * if there are no extents. | |
3467 | */ | |
3468 | if (unlikely(!eh->eh_entries)) | |
3469 | goto out; | |
58590b06 TT |
3470 | last_ex = EXT_LAST_EXTENT(eh); |
3471 | /* | |
3472 | * We should clear the EOFBLOCKS_FL flag if we are writing the | |
3473 | * last block in the last extent in the file. We test this by | |
3474 | * first checking to see if the caller to | |
3475 | * ext4_ext_get_blocks() was interested in the last block (or | |
3476 | * a block beyond the last block) in the current extent. If | |
3477 | * this turns out to be false, we can bail out from this | |
3478 | * function immediately. | |
3479 | */ | |
d002ebf1 | 3480 | if (lblk + len < le32_to_cpu(last_ex->ee_block) + |
58590b06 TT |
3481 | ext4_ext_get_actual_len(last_ex)) |
3482 | return 0; | |
3483 | /* | |
3484 | * If the caller does appear to be planning to write at or | |
3485 | * beyond the end of the current extent, we then test to see | |
3486 | * if the current extent is the last extent in the file, by | |
3487 | * checking to make sure it was reached via the rightmost node | |
3488 | * at each level of the tree. | |
3489 | */ | |
3490 | for (i = depth-1; i >= 0; i--) | |
3491 | if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr)) | |
3492 | return 0; | |
afcff5d8 | 3493 | out: |
58590b06 TT |
3494 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
3495 | return ext4_mark_inode_dirty(handle, inode); | |
3496 | } | |
3497 | ||
7b415bf6 AK |
3498 | /** |
3499 | * ext4_find_delalloc_range: find delayed allocated block in the given range. | |
3500 | * | |
7d1b1fbc | 3501 | * Return 1 if there is a delalloc block in the range, otherwise 0. |
7b415bf6 AK |
3502 | */ |
3503 | static int ext4_find_delalloc_range(struct inode *inode, | |
3504 | ext4_lblk_t lblk_start, | |
7d1b1fbc | 3505 | ext4_lblk_t lblk_end) |
7b415bf6 | 3506 | { |
7d1b1fbc | 3507 | struct extent_status es; |
7b415bf6 | 3508 | |
7d1b1fbc ZL |
3509 | es.start = lblk_start; |
3510 | ext4_es_find_extent(inode, &es); | |
3511 | if (es.len == 0) | |
3512 | return 0; /* there is no delay extent in this tree */ | |
3513 | else if (es.start <= lblk_start && lblk_start < es.start + es.len) | |
3514 | return 1; | |
3515 | else if (lblk_start <= es.start && es.start <= lblk_end) | |
3516 | return 1; | |
7b415bf6 | 3517 | else |
7d1b1fbc | 3518 | return 0; |
7b415bf6 AK |
3519 | } |
3520 | ||
7d1b1fbc | 3521 | int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk) |
7b415bf6 AK |
3522 | { |
3523 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3524 | ext4_lblk_t lblk_start, lblk_end; | |
3525 | lblk_start = lblk & (~(sbi->s_cluster_ratio - 1)); | |
3526 | lblk_end = lblk_start + sbi->s_cluster_ratio - 1; | |
3527 | ||
7d1b1fbc | 3528 | return ext4_find_delalloc_range(inode, lblk_start, lblk_end); |
7b415bf6 AK |
3529 | } |
3530 | ||
3531 | /** | |
3532 | * Determines how many complete clusters (out of those specified by the 'map') | |
3533 | * are under delalloc and were reserved quota for. | |
3534 | * This function is called when we are writing out the blocks that were | |
3535 | * originally written with their allocation delayed, but then the space was | |
3536 | * allocated using fallocate() before the delayed allocation could be resolved. | |
3537 | * The cases to look for are: | |
3538 | * ('=' indicated delayed allocated blocks | |
3539 | * '-' indicates non-delayed allocated blocks) | |
3540 | * (a) partial clusters towards beginning and/or end outside of allocated range | |
3541 | * are not delalloc'ed. | |
3542 | * Ex: | |
3543 | * |----c---=|====c====|====c====|===-c----| | |
3544 | * |++++++ allocated ++++++| | |
3545 | * ==> 4 complete clusters in above example | |
3546 | * | |
3547 | * (b) partial cluster (outside of allocated range) towards either end is | |
3548 | * marked for delayed allocation. In this case, we will exclude that | |
3549 | * cluster. | |
3550 | * Ex: | |
3551 | * |----====c========|========c========| | |
3552 | * |++++++ allocated ++++++| | |
3553 | * ==> 1 complete clusters in above example | |
3554 | * | |
3555 | * Ex: | |
3556 | * |================c================| | |
3557 | * |++++++ allocated ++++++| | |
3558 | * ==> 0 complete clusters in above example | |
3559 | * | |
3560 | * The ext4_da_update_reserve_space will be called only if we | |
3561 | * determine here that there were some "entire" clusters that span | |
3562 | * this 'allocated' range. | |
3563 | * In the non-bigalloc case, this function will just end up returning num_blks | |
3564 | * without ever calling ext4_find_delalloc_range. | |
3565 | */ | |
3566 | static unsigned int | |
3567 | get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start, | |
3568 | unsigned int num_blks) | |
3569 | { | |
3570 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3571 | ext4_lblk_t alloc_cluster_start, alloc_cluster_end; | |
3572 | ext4_lblk_t lblk_from, lblk_to, c_offset; | |
3573 | unsigned int allocated_clusters = 0; | |
3574 | ||
3575 | alloc_cluster_start = EXT4_B2C(sbi, lblk_start); | |
3576 | alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1); | |
3577 | ||
3578 | /* max possible clusters for this allocation */ | |
3579 | allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1; | |
3580 | ||
d8990240 AK |
3581 | trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks); |
3582 | ||
7b415bf6 AK |
3583 | /* Check towards left side */ |
3584 | c_offset = lblk_start & (sbi->s_cluster_ratio - 1); | |
3585 | if (c_offset) { | |
3586 | lblk_from = lblk_start & (~(sbi->s_cluster_ratio - 1)); | |
3587 | lblk_to = lblk_from + c_offset - 1; | |
3588 | ||
7d1b1fbc | 3589 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
7b415bf6 AK |
3590 | allocated_clusters--; |
3591 | } | |
3592 | ||
3593 | /* Now check towards right. */ | |
3594 | c_offset = (lblk_start + num_blks) & (sbi->s_cluster_ratio - 1); | |
3595 | if (allocated_clusters && c_offset) { | |
3596 | lblk_from = lblk_start + num_blks; | |
3597 | lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1; | |
3598 | ||
7d1b1fbc | 3599 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
7b415bf6 AK |
3600 | allocated_clusters--; |
3601 | } | |
3602 | ||
3603 | return allocated_clusters; | |
3604 | } | |
3605 | ||
0031462b MC |
3606 | static int |
3607 | ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, | |
e35fd660 | 3608 | struct ext4_map_blocks *map, |
0031462b | 3609 | struct ext4_ext_path *path, int flags, |
e35fd660 | 3610 | unsigned int allocated, ext4_fsblk_t newblock) |
0031462b MC |
3611 | { |
3612 | int ret = 0; | |
3613 | int err = 0; | |
f45ee3a1 | 3614 | ext4_io_end_t *io = ext4_inode_aio(inode); |
0031462b | 3615 | |
88635ca2 ZL |
3616 | ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical " |
3617 | "block %llu, max_blocks %u, flags %x, allocated %u\n", | |
e35fd660 | 3618 | inode->i_ino, (unsigned long long)map->m_lblk, map->m_len, |
0031462b MC |
3619 | flags, allocated); |
3620 | ext4_ext_show_leaf(inode, path); | |
3621 | ||
b5645534 ZL |
3622 | trace_ext4_ext_handle_uninitialized_extents(inode, map, flags, |
3623 | allocated, newblock); | |
d8990240 | 3624 | |
c7064ef1 | 3625 | /* get_block() before submit the IO, split the extent */ |
744692dc | 3626 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) { |
e35fd660 TT |
3627 | ret = ext4_split_unwritten_extents(handle, inode, map, |
3628 | path, flags); | |
82e54229 DM |
3629 | if (ret <= 0) |
3630 | goto out; | |
5f524950 M |
3631 | /* |
3632 | * Flag the inode(non aio case) or end_io struct (aio case) | |
25985edc | 3633 | * that this IO needs to conversion to written when IO is |
5f524950 M |
3634 | * completed |
3635 | */ | |
0edeb71d TM |
3636 | if (io) |
3637 | ext4_set_io_unwritten_flag(inode, io); | |
3638 | else | |
19f5fb7a | 3639 | ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
744692dc | 3640 | if (ext4_should_dioread_nolock(inode)) |
e35fd660 | 3641 | map->m_flags |= EXT4_MAP_UNINIT; |
0031462b MC |
3642 | goto out; |
3643 | } | |
c7064ef1 | 3644 | /* IO end_io complete, convert the filled extent to written */ |
744692dc | 3645 | if ((flags & EXT4_GET_BLOCKS_CONVERT)) { |
dee1f973 | 3646 | ret = ext4_convert_unwritten_extents_endio(handle, inode, map, |
0031462b | 3647 | path); |
58590b06 | 3648 | if (ret >= 0) { |
b436b9be | 3649 | ext4_update_inode_fsync_trans(handle, inode, 1); |
d002ebf1 ES |
3650 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
3651 | path, map->m_len); | |
58590b06 TT |
3652 | } else |
3653 | err = ret; | |
0031462b MC |
3654 | goto out2; |
3655 | } | |
3656 | /* buffered IO case */ | |
3657 | /* | |
3658 | * repeat fallocate creation request | |
3659 | * we already have an unwritten extent | |
3660 | */ | |
3661 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) | |
3662 | goto map_out; | |
3663 | ||
3664 | /* buffered READ or buffered write_begin() lookup */ | |
3665 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { | |
3666 | /* | |
3667 | * We have blocks reserved already. We | |
3668 | * return allocated blocks so that delalloc | |
3669 | * won't do block reservation for us. But | |
3670 | * the buffer head will be unmapped so that | |
3671 | * a read from the block returns 0s. | |
3672 | */ | |
e35fd660 | 3673 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
0031462b MC |
3674 | goto out1; |
3675 | } | |
3676 | ||
3677 | /* buffered write, writepage time, convert*/ | |
e35fd660 | 3678 | ret = ext4_ext_convert_to_initialized(handle, inode, map, path); |
a4e5d88b | 3679 | if (ret >= 0) |
b436b9be | 3680 | ext4_update_inode_fsync_trans(handle, inode, 1); |
0031462b MC |
3681 | out: |
3682 | if (ret <= 0) { | |
3683 | err = ret; | |
3684 | goto out2; | |
3685 | } else | |
3686 | allocated = ret; | |
e35fd660 | 3687 | map->m_flags |= EXT4_MAP_NEW; |
515f41c3 AK |
3688 | /* |
3689 | * if we allocated more blocks than requested | |
3690 | * we need to make sure we unmap the extra block | |
3691 | * allocated. The actual needed block will get | |
3692 | * unmapped later when we find the buffer_head marked | |
3693 | * new. | |
3694 | */ | |
e35fd660 | 3695 | if (allocated > map->m_len) { |
515f41c3 | 3696 | unmap_underlying_metadata_blocks(inode->i_sb->s_bdev, |
e35fd660 TT |
3697 | newblock + map->m_len, |
3698 | allocated - map->m_len); | |
3699 | allocated = map->m_len; | |
515f41c3 | 3700 | } |
5f634d06 AK |
3701 | |
3702 | /* | |
3703 | * If we have done fallocate with the offset that is already | |
3704 | * delayed allocated, we would have block reservation | |
3705 | * and quota reservation done in the delayed write path. | |
3706 | * But fallocate would have already updated quota and block | |
3707 | * count for this offset. So cancel these reservation | |
3708 | */ | |
7b415bf6 AK |
3709 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
3710 | unsigned int reserved_clusters; | |
3711 | reserved_clusters = get_reserved_cluster_alloc(inode, | |
3712 | map->m_lblk, map->m_len); | |
3713 | if (reserved_clusters) | |
3714 | ext4_da_update_reserve_space(inode, | |
3715 | reserved_clusters, | |
3716 | 0); | |
3717 | } | |
5f634d06 | 3718 | |
0031462b | 3719 | map_out: |
e35fd660 | 3720 | map->m_flags |= EXT4_MAP_MAPPED; |
a4e5d88b DM |
3721 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) { |
3722 | err = check_eofblocks_fl(handle, inode, map->m_lblk, path, | |
3723 | map->m_len); | |
3724 | if (err < 0) | |
3725 | goto out2; | |
3726 | } | |
0031462b | 3727 | out1: |
e35fd660 TT |
3728 | if (allocated > map->m_len) |
3729 | allocated = map->m_len; | |
0031462b | 3730 | ext4_ext_show_leaf(inode, path); |
e35fd660 TT |
3731 | map->m_pblk = newblock; |
3732 | map->m_len = allocated; | |
0031462b MC |
3733 | out2: |
3734 | if (path) { | |
3735 | ext4_ext_drop_refs(path); | |
3736 | kfree(path); | |
3737 | } | |
3738 | return err ? err : allocated; | |
3739 | } | |
58590b06 | 3740 | |
4d33b1ef TT |
3741 | /* |
3742 | * get_implied_cluster_alloc - check to see if the requested | |
3743 | * allocation (in the map structure) overlaps with a cluster already | |
3744 | * allocated in an extent. | |
d8990240 | 3745 | * @sb The filesystem superblock structure |
4d33b1ef TT |
3746 | * @map The requested lblk->pblk mapping |
3747 | * @ex The extent structure which might contain an implied | |
3748 | * cluster allocation | |
3749 | * | |
3750 | * This function is called by ext4_ext_map_blocks() after we failed to | |
3751 | * find blocks that were already in the inode's extent tree. Hence, | |
3752 | * we know that the beginning of the requested region cannot overlap | |
3753 | * the extent from the inode's extent tree. There are three cases we | |
3754 | * want to catch. The first is this case: | |
3755 | * | |
3756 | * |--- cluster # N--| | |
3757 | * |--- extent ---| |---- requested region ---| | |
3758 | * |==========| | |
3759 | * | |
3760 | * The second case that we need to test for is this one: | |
3761 | * | |
3762 | * |--------- cluster # N ----------------| | |
3763 | * |--- requested region --| |------- extent ----| | |
3764 | * |=======================| | |
3765 | * | |
3766 | * The third case is when the requested region lies between two extents | |
3767 | * within the same cluster: | |
3768 | * |------------- cluster # N-------------| | |
3769 | * |----- ex -----| |---- ex_right ----| | |
3770 | * |------ requested region ------| | |
3771 | * |================| | |
3772 | * | |
3773 | * In each of the above cases, we need to set the map->m_pblk and | |
3774 | * map->m_len so it corresponds to the return the extent labelled as | |
3775 | * "|====|" from cluster #N, since it is already in use for data in | |
3776 | * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to | |
3777 | * signal to ext4_ext_map_blocks() that map->m_pblk should be treated | |
3778 | * as a new "allocated" block region. Otherwise, we will return 0 and | |
3779 | * ext4_ext_map_blocks() will then allocate one or more new clusters | |
3780 | * by calling ext4_mb_new_blocks(). | |
3781 | */ | |
d8990240 | 3782 | static int get_implied_cluster_alloc(struct super_block *sb, |
4d33b1ef TT |
3783 | struct ext4_map_blocks *map, |
3784 | struct ext4_extent *ex, | |
3785 | struct ext4_ext_path *path) | |
3786 | { | |
d8990240 | 3787 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
4d33b1ef TT |
3788 | ext4_lblk_t c_offset = map->m_lblk & (sbi->s_cluster_ratio-1); |
3789 | ext4_lblk_t ex_cluster_start, ex_cluster_end; | |
14d7f3ef | 3790 | ext4_lblk_t rr_cluster_start; |
4d33b1ef TT |
3791 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
3792 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); | |
3793 | unsigned short ee_len = ext4_ext_get_actual_len(ex); | |
3794 | ||
3795 | /* The extent passed in that we are trying to match */ | |
3796 | ex_cluster_start = EXT4_B2C(sbi, ee_block); | |
3797 | ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1); | |
3798 | ||
3799 | /* The requested region passed into ext4_map_blocks() */ | |
3800 | rr_cluster_start = EXT4_B2C(sbi, map->m_lblk); | |
4d33b1ef TT |
3801 | |
3802 | if ((rr_cluster_start == ex_cluster_end) || | |
3803 | (rr_cluster_start == ex_cluster_start)) { | |
3804 | if (rr_cluster_start == ex_cluster_end) | |
3805 | ee_start += ee_len - 1; | |
3806 | map->m_pblk = (ee_start & ~(sbi->s_cluster_ratio - 1)) + | |
3807 | c_offset; | |
3808 | map->m_len = min(map->m_len, | |
3809 | (unsigned) sbi->s_cluster_ratio - c_offset); | |
3810 | /* | |
3811 | * Check for and handle this case: | |
3812 | * | |
3813 | * |--------- cluster # N-------------| | |
3814 | * |------- extent ----| | |
3815 | * |--- requested region ---| | |
3816 | * |===========| | |
3817 | */ | |
3818 | ||
3819 | if (map->m_lblk < ee_block) | |
3820 | map->m_len = min(map->m_len, ee_block - map->m_lblk); | |
3821 | ||
3822 | /* | |
3823 | * Check for the case where there is already another allocated | |
3824 | * block to the right of 'ex' but before the end of the cluster. | |
3825 | * | |
3826 | * |------------- cluster # N-------------| | |
3827 | * |----- ex -----| |---- ex_right ----| | |
3828 | * |------ requested region ------| | |
3829 | * |================| | |
3830 | */ | |
3831 | if (map->m_lblk > ee_block) { | |
3832 | ext4_lblk_t next = ext4_ext_next_allocated_block(path); | |
3833 | map->m_len = min(map->m_len, next - map->m_lblk); | |
3834 | } | |
d8990240 AK |
3835 | |
3836 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1); | |
4d33b1ef TT |
3837 | return 1; |
3838 | } | |
d8990240 AK |
3839 | |
3840 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0); | |
4d33b1ef TT |
3841 | return 0; |
3842 | } | |
3843 | ||
3844 | ||
c278bfec | 3845 | /* |
f5ab0d1f MC |
3846 | * Block allocation/map/preallocation routine for extents based files |
3847 | * | |
3848 | * | |
c278bfec | 3849 | * Need to be called with |
0e855ac8 AK |
3850 | * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block |
3851 | * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem) | |
f5ab0d1f MC |
3852 | * |
3853 | * return > 0, number of of blocks already mapped/allocated | |
3854 | * if create == 0 and these are pre-allocated blocks | |
3855 | * buffer head is unmapped | |
3856 | * otherwise blocks are mapped | |
3857 | * | |
3858 | * return = 0, if plain look up failed (blocks have not been allocated) | |
3859 | * buffer head is unmapped | |
3860 | * | |
3861 | * return < 0, error case. | |
c278bfec | 3862 | */ |
e35fd660 TT |
3863 | int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
3864 | struct ext4_map_blocks *map, int flags) | |
a86c6181 AT |
3865 | { |
3866 | struct ext4_ext_path *path = NULL; | |
4d33b1ef TT |
3867 | struct ext4_extent newex, *ex, *ex2; |
3868 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0562e0ba | 3869 | ext4_fsblk_t newblock = 0; |
37794732 | 3870 | int free_on_err = 0, err = 0, depth; |
4d33b1ef | 3871 | unsigned int allocated = 0, offset = 0; |
81fdbb4a | 3872 | unsigned int allocated_clusters = 0; |
c9de560d | 3873 | struct ext4_allocation_request ar; |
f45ee3a1 | 3874 | ext4_io_end_t *io = ext4_inode_aio(inode); |
4d33b1ef | 3875 | ext4_lblk_t cluster_offset; |
82e54229 | 3876 | int set_unwritten = 0; |
a86c6181 | 3877 | |
84fe3bef | 3878 | ext_debug("blocks %u/%u requested for inode %lu\n", |
e35fd660 | 3879 | map->m_lblk, map->m_len, inode->i_ino); |
0562e0ba | 3880 | trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags); |
a86c6181 AT |
3881 | |
3882 | /* check in cache */ | |
7877191c | 3883 | if (ext4_ext_in_cache(inode, map->m_lblk, &newex)) { |
b05e6ae5 | 3884 | if (!newex.ee_start_lo && !newex.ee_start_hi) { |
7b415bf6 | 3885 | if ((sbi->s_cluster_ratio > 1) && |
7d1b1fbc | 3886 | ext4_find_delalloc_cluster(inode, map->m_lblk)) |
7b415bf6 AK |
3887 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
3888 | ||
c2177057 | 3889 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
56055d3a AA |
3890 | /* |
3891 | * block isn't allocated yet and | |
3892 | * user doesn't want to allocate it | |
3893 | */ | |
a86c6181 AT |
3894 | goto out2; |
3895 | } | |
3896 | /* we should allocate requested block */ | |
b05e6ae5 | 3897 | } else { |
a86c6181 | 3898 | /* block is already allocated */ |
7b415bf6 AK |
3899 | if (sbi->s_cluster_ratio > 1) |
3900 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; | |
e35fd660 | 3901 | newblock = map->m_lblk |
8c55e204 | 3902 | - le32_to_cpu(newex.ee_block) |
bf89d16f | 3903 | + ext4_ext_pblock(&newex); |
d0d856e8 | 3904 | /* number of remaining blocks in the extent */ |
b939e376 | 3905 | allocated = ext4_ext_get_actual_len(&newex) - |
e35fd660 | 3906 | (map->m_lblk - le32_to_cpu(newex.ee_block)); |
a86c6181 | 3907 | goto out; |
a86c6181 AT |
3908 | } |
3909 | } | |
3910 | ||
3911 | /* find extent for this block */ | |
e35fd660 | 3912 | path = ext4_ext_find_extent(inode, map->m_lblk, NULL); |
a86c6181 AT |
3913 | if (IS_ERR(path)) { |
3914 | err = PTR_ERR(path); | |
3915 | path = NULL; | |
3916 | goto out2; | |
3917 | } | |
3918 | ||
3919 | depth = ext_depth(inode); | |
3920 | ||
3921 | /* | |
d0d856e8 RD |
3922 | * consistent leaf must not be empty; |
3923 | * this situation is possible, though, _during_ tree modification; | |
a86c6181 AT |
3924 | * this is why assert can't be put in ext4_ext_find_extent() |
3925 | */ | |
273df556 FM |
3926 | if (unlikely(path[depth].p_ext == NULL && depth != 0)) { |
3927 | EXT4_ERROR_INODE(inode, "bad extent address " | |
f70f362b TT |
3928 | "lblock: %lu, depth: %d pblock %lld", |
3929 | (unsigned long) map->m_lblk, depth, | |
3930 | path[depth].p_block); | |
034fb4c9 SP |
3931 | err = -EIO; |
3932 | goto out2; | |
3933 | } | |
a86c6181 | 3934 | |
7e028976 AM |
3935 | ex = path[depth].p_ext; |
3936 | if (ex) { | |
725d26d3 | 3937 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
bf89d16f | 3938 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
a2df2a63 | 3939 | unsigned short ee_len; |
471d4011 SB |
3940 | |
3941 | /* | |
471d4011 | 3942 | * Uninitialized extents are treated as holes, except that |
56055d3a | 3943 | * we split out initialized portions during a write. |
471d4011 | 3944 | */ |
a2df2a63 | 3945 | ee_len = ext4_ext_get_actual_len(ex); |
d8990240 AK |
3946 | |
3947 | trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len); | |
3948 | ||
d0d856e8 | 3949 | /* if found extent covers block, simply return it */ |
e35fd660 TT |
3950 | if (in_range(map->m_lblk, ee_block, ee_len)) { |
3951 | newblock = map->m_lblk - ee_block + ee_start; | |
d0d856e8 | 3952 | /* number of remaining blocks in the extent */ |
e35fd660 TT |
3953 | allocated = ee_len - (map->m_lblk - ee_block); |
3954 | ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk, | |
3955 | ee_block, ee_len, newblock); | |
56055d3a | 3956 | |
e861304b | 3957 | /* |
7877191c LC |
3958 | * Do not put uninitialized extent |
3959 | * in the cache | |
e861304b | 3960 | */ |
7877191c LC |
3961 | if (!ext4_ext_is_uninitialized(ex)) { |
3962 | ext4_ext_put_in_cache(inode, ee_block, | |
3963 | ee_len, ee_start); | |
3964 | goto out; | |
f7d0d379 | 3965 | } |
37794732 | 3966 | allocated = ext4_ext_handle_uninitialized_extents( |
7877191c LC |
3967 | handle, inode, map, path, flags, |
3968 | allocated, newblock); | |
37794732 | 3969 | goto out3; |
a86c6181 AT |
3970 | } |
3971 | } | |
3972 | ||
7b415bf6 | 3973 | if ((sbi->s_cluster_ratio > 1) && |
7d1b1fbc | 3974 | ext4_find_delalloc_cluster(inode, map->m_lblk)) |
7b415bf6 AK |
3975 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
3976 | ||
a86c6181 | 3977 | /* |
d0d856e8 | 3978 | * requested block isn't allocated yet; |
a86c6181 AT |
3979 | * we couldn't try to create block if create flag is zero |
3980 | */ | |
c2177057 | 3981 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
56055d3a AA |
3982 | /* |
3983 | * put just found gap into cache to speed up | |
3984 | * subsequent requests | |
3985 | */ | |
e35fd660 | 3986 | ext4_ext_put_gap_in_cache(inode, path, map->m_lblk); |
a86c6181 AT |
3987 | goto out2; |
3988 | } | |
4d33b1ef | 3989 | |
a86c6181 | 3990 | /* |
c2ea3fde | 3991 | * Okay, we need to do block allocation. |
63f57933 | 3992 | */ |
7b415bf6 | 3993 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; |
4d33b1ef TT |
3994 | newex.ee_block = cpu_to_le32(map->m_lblk); |
3995 | cluster_offset = map->m_lblk & (sbi->s_cluster_ratio-1); | |
3996 | ||
3997 | /* | |
3998 | * If we are doing bigalloc, check to see if the extent returned | |
3999 | * by ext4_ext_find_extent() implies a cluster we can use. | |
4000 | */ | |
4001 | if (cluster_offset && ex && | |
d8990240 | 4002 | get_implied_cluster_alloc(inode->i_sb, map, ex, path)) { |
4d33b1ef TT |
4003 | ar.len = allocated = map->m_len; |
4004 | newblock = map->m_pblk; | |
7b415bf6 | 4005 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
4d33b1ef TT |
4006 | goto got_allocated_blocks; |
4007 | } | |
a86c6181 | 4008 | |
c9de560d | 4009 | /* find neighbour allocated blocks */ |
e35fd660 | 4010 | ar.lleft = map->m_lblk; |
c9de560d AT |
4011 | err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft); |
4012 | if (err) | |
4013 | goto out2; | |
e35fd660 | 4014 | ar.lright = map->m_lblk; |
4d33b1ef TT |
4015 | ex2 = NULL; |
4016 | err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2); | |
c9de560d AT |
4017 | if (err) |
4018 | goto out2; | |
25d14f98 | 4019 | |
4d33b1ef TT |
4020 | /* Check if the extent after searching to the right implies a |
4021 | * cluster we can use. */ | |
4022 | if ((sbi->s_cluster_ratio > 1) && ex2 && | |
d8990240 | 4023 | get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) { |
4d33b1ef TT |
4024 | ar.len = allocated = map->m_len; |
4025 | newblock = map->m_pblk; | |
7b415bf6 | 4026 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
4d33b1ef TT |
4027 | goto got_allocated_blocks; |
4028 | } | |
4029 | ||
749269fa AA |
4030 | /* |
4031 | * See if request is beyond maximum number of blocks we can have in | |
4032 | * a single extent. For an initialized extent this limit is | |
4033 | * EXT_INIT_MAX_LEN and for an uninitialized extent this limit is | |
4034 | * EXT_UNINIT_MAX_LEN. | |
4035 | */ | |
e35fd660 | 4036 | if (map->m_len > EXT_INIT_MAX_LEN && |
c2177057 | 4037 | !(flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
e35fd660 TT |
4038 | map->m_len = EXT_INIT_MAX_LEN; |
4039 | else if (map->m_len > EXT_UNINIT_MAX_LEN && | |
c2177057 | 4040 | (flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
e35fd660 | 4041 | map->m_len = EXT_UNINIT_MAX_LEN; |
749269fa | 4042 | |
e35fd660 | 4043 | /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */ |
e35fd660 | 4044 | newex.ee_len = cpu_to_le16(map->m_len); |
4d33b1ef | 4045 | err = ext4_ext_check_overlap(sbi, inode, &newex, path); |
25d14f98 | 4046 | if (err) |
b939e376 | 4047 | allocated = ext4_ext_get_actual_len(&newex); |
25d14f98 | 4048 | else |
e35fd660 | 4049 | allocated = map->m_len; |
c9de560d AT |
4050 | |
4051 | /* allocate new block */ | |
4052 | ar.inode = inode; | |
e35fd660 TT |
4053 | ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk); |
4054 | ar.logical = map->m_lblk; | |
4d33b1ef TT |
4055 | /* |
4056 | * We calculate the offset from the beginning of the cluster | |
4057 | * for the logical block number, since when we allocate a | |
4058 | * physical cluster, the physical block should start at the | |
4059 | * same offset from the beginning of the cluster. This is | |
4060 | * needed so that future calls to get_implied_cluster_alloc() | |
4061 | * work correctly. | |
4062 | */ | |
4063 | offset = map->m_lblk & (sbi->s_cluster_ratio - 1); | |
4064 | ar.len = EXT4_NUM_B2C(sbi, offset+allocated); | |
4065 | ar.goal -= offset; | |
4066 | ar.logical -= offset; | |
c9de560d AT |
4067 | if (S_ISREG(inode->i_mode)) |
4068 | ar.flags = EXT4_MB_HINT_DATA; | |
4069 | else | |
4070 | /* disable in-core preallocation for non-regular files */ | |
4071 | ar.flags = 0; | |
556b27ab VH |
4072 | if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE) |
4073 | ar.flags |= EXT4_MB_HINT_NOPREALLOC; | |
c9de560d | 4074 | newblock = ext4_mb_new_blocks(handle, &ar, &err); |
a86c6181 AT |
4075 | if (!newblock) |
4076 | goto out2; | |
84fe3bef | 4077 | ext_debug("allocate new block: goal %llu, found %llu/%u\n", |
498e5f24 | 4078 | ar.goal, newblock, allocated); |
4d33b1ef | 4079 | free_on_err = 1; |
7b415bf6 | 4080 | allocated_clusters = ar.len; |
4d33b1ef TT |
4081 | ar.len = EXT4_C2B(sbi, ar.len) - offset; |
4082 | if (ar.len > allocated) | |
4083 | ar.len = allocated; | |
a86c6181 | 4084 | |
4d33b1ef | 4085 | got_allocated_blocks: |
a86c6181 | 4086 | /* try to insert new extent into found leaf and return */ |
4d33b1ef | 4087 | ext4_ext_store_pblock(&newex, newblock + offset); |
c9de560d | 4088 | newex.ee_len = cpu_to_le16(ar.len); |
8d5d02e6 MC |
4089 | /* Mark uninitialized */ |
4090 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){ | |
a2df2a63 | 4091 | ext4_ext_mark_uninitialized(&newex); |
8d5d02e6 | 4092 | /* |
744692dc | 4093 | * io_end structure was created for every IO write to an |
25985edc | 4094 | * uninitialized extent. To avoid unnecessary conversion, |
744692dc | 4095 | * here we flag the IO that really needs the conversion. |
5f524950 | 4096 | * For non asycn direct IO case, flag the inode state |
25985edc | 4097 | * that we need to perform conversion when IO is done. |
8d5d02e6 | 4098 | */ |
82e54229 DM |
4099 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) |
4100 | set_unwritten = 1; | |
744692dc | 4101 | if (ext4_should_dioread_nolock(inode)) |
e35fd660 | 4102 | map->m_flags |= EXT4_MAP_UNINIT; |
8d5d02e6 | 4103 | } |
c8d46e41 | 4104 | |
a4e5d88b DM |
4105 | err = 0; |
4106 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) | |
4107 | err = check_eofblocks_fl(handle, inode, map->m_lblk, | |
4108 | path, ar.len); | |
575a1d4b JZ |
4109 | if (!err) |
4110 | err = ext4_ext_insert_extent(handle, inode, path, | |
4111 | &newex, flags); | |
82e54229 DM |
4112 | |
4113 | if (!err && set_unwritten) { | |
4114 | if (io) | |
4115 | ext4_set_io_unwritten_flag(inode, io); | |
4116 | else | |
4117 | ext4_set_inode_state(inode, | |
4118 | EXT4_STATE_DIO_UNWRITTEN); | |
4119 | } | |
4120 | ||
4d33b1ef | 4121 | if (err && free_on_err) { |
7132de74 MP |
4122 | int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ? |
4123 | EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0; | |
315054f0 | 4124 | /* free data blocks we just allocated */ |
c9de560d AT |
4125 | /* not a good idea to call discard here directly, |
4126 | * but otherwise we'd need to call it every free() */ | |
c2ea3fde | 4127 | ext4_discard_preallocations(inode); |
7dc57615 | 4128 | ext4_free_blocks(handle, inode, NULL, ext4_ext_pblock(&newex), |
7132de74 | 4129 | ext4_ext_get_actual_len(&newex), fb_flags); |
a86c6181 | 4130 | goto out2; |
315054f0 | 4131 | } |
a86c6181 | 4132 | |
a86c6181 | 4133 | /* previous routine could use block we allocated */ |
bf89d16f | 4134 | newblock = ext4_ext_pblock(&newex); |
b939e376 | 4135 | allocated = ext4_ext_get_actual_len(&newex); |
e35fd660 TT |
4136 | if (allocated > map->m_len) |
4137 | allocated = map->m_len; | |
4138 | map->m_flags |= EXT4_MAP_NEW; | |
a86c6181 | 4139 | |
5f634d06 AK |
4140 | /* |
4141 | * Update reserved blocks/metadata blocks after successful | |
4142 | * block allocation which had been deferred till now. | |
4143 | */ | |
7b415bf6 | 4144 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
81fdbb4a | 4145 | unsigned int reserved_clusters; |
7b415bf6 | 4146 | /* |
81fdbb4a | 4147 | * Check how many clusters we had reserved this allocated range |
7b415bf6 AK |
4148 | */ |
4149 | reserved_clusters = get_reserved_cluster_alloc(inode, | |
4150 | map->m_lblk, allocated); | |
4151 | if (map->m_flags & EXT4_MAP_FROM_CLUSTER) { | |
4152 | if (reserved_clusters) { | |
4153 | /* | |
4154 | * We have clusters reserved for this range. | |
4155 | * But since we are not doing actual allocation | |
4156 | * and are simply using blocks from previously | |
4157 | * allocated cluster, we should release the | |
4158 | * reservation and not claim quota. | |
4159 | */ | |
4160 | ext4_da_update_reserve_space(inode, | |
4161 | reserved_clusters, 0); | |
4162 | } | |
4163 | } else { | |
4164 | BUG_ON(allocated_clusters < reserved_clusters); | |
4165 | /* We will claim quota for all newly allocated blocks.*/ | |
4166 | ext4_da_update_reserve_space(inode, allocated_clusters, | |
4167 | 1); | |
4168 | if (reserved_clusters < allocated_clusters) { | |
5356f261 | 4169 | struct ext4_inode_info *ei = EXT4_I(inode); |
7b415bf6 AK |
4170 | int reservation = allocated_clusters - |
4171 | reserved_clusters; | |
4172 | /* | |
4173 | * It seems we claimed few clusters outside of | |
4174 | * the range of this allocation. We should give | |
4175 | * it back to the reservation pool. This can | |
4176 | * happen in the following case: | |
4177 | * | |
4178 | * * Suppose s_cluster_ratio is 4 (i.e., each | |
4179 | * cluster has 4 blocks. Thus, the clusters | |
4180 | * are [0-3],[4-7],[8-11]... | |
4181 | * * First comes delayed allocation write for | |
4182 | * logical blocks 10 & 11. Since there were no | |
4183 | * previous delayed allocated blocks in the | |
4184 | * range [8-11], we would reserve 1 cluster | |
4185 | * for this write. | |
4186 | * * Next comes write for logical blocks 3 to 8. | |
4187 | * In this case, we will reserve 2 clusters | |
4188 | * (for [0-3] and [4-7]; and not for [8-11] as | |
4189 | * that range has a delayed allocated blocks. | |
4190 | * Thus total reserved clusters now becomes 3. | |
4191 | * * Now, during the delayed allocation writeout | |
4192 | * time, we will first write blocks [3-8] and | |
4193 | * allocate 3 clusters for writing these | |
4194 | * blocks. Also, we would claim all these | |
4195 | * three clusters above. | |
4196 | * * Now when we come here to writeout the | |
4197 | * blocks [10-11], we would expect to claim | |
4198 | * the reservation of 1 cluster we had made | |
4199 | * (and we would claim it since there are no | |
4200 | * more delayed allocated blocks in the range | |
4201 | * [8-11]. But our reserved cluster count had | |
4202 | * already gone to 0. | |
4203 | * | |
4204 | * Thus, at the step 4 above when we determine | |
4205 | * that there are still some unwritten delayed | |
4206 | * allocated blocks outside of our current | |
4207 | * block range, we should increment the | |
4208 | * reserved clusters count so that when the | |
4209 | * remaining blocks finally gets written, we | |
4210 | * could claim them. | |
4211 | */ | |
5356f261 AK |
4212 | dquot_reserve_block(inode, |
4213 | EXT4_C2B(sbi, reservation)); | |
4214 | spin_lock(&ei->i_block_reservation_lock); | |
4215 | ei->i_reserved_data_blocks += reservation; | |
4216 | spin_unlock(&ei->i_block_reservation_lock); | |
7b415bf6 AK |
4217 | } |
4218 | } | |
4219 | } | |
5f634d06 | 4220 | |
b436b9be JK |
4221 | /* |
4222 | * Cache the extent and update transaction to commit on fdatasync only | |
4223 | * when it is _not_ an uninitialized extent. | |
4224 | */ | |
4225 | if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) { | |
b05e6ae5 | 4226 | ext4_ext_put_in_cache(inode, map->m_lblk, allocated, newblock); |
b436b9be JK |
4227 | ext4_update_inode_fsync_trans(handle, inode, 1); |
4228 | } else | |
4229 | ext4_update_inode_fsync_trans(handle, inode, 0); | |
a86c6181 | 4230 | out: |
e35fd660 TT |
4231 | if (allocated > map->m_len) |
4232 | allocated = map->m_len; | |
a86c6181 | 4233 | ext4_ext_show_leaf(inode, path); |
e35fd660 TT |
4234 | map->m_flags |= EXT4_MAP_MAPPED; |
4235 | map->m_pblk = newblock; | |
4236 | map->m_len = allocated; | |
a86c6181 AT |
4237 | out2: |
4238 | if (path) { | |
4239 | ext4_ext_drop_refs(path); | |
4240 | kfree(path); | |
4241 | } | |
e861304b | 4242 | |
37794732 | 4243 | out3: |
19b303d8 | 4244 | trace_ext4_ext_map_blocks_exit(inode, map, err ? err : allocated); |
e7b319e3 | 4245 | |
7877191c | 4246 | return err ? err : allocated; |
a86c6181 AT |
4247 | } |
4248 | ||
cf108bca | 4249 | void ext4_ext_truncate(struct inode *inode) |
a86c6181 AT |
4250 | { |
4251 | struct address_space *mapping = inode->i_mapping; | |
4252 | struct super_block *sb = inode->i_sb; | |
725d26d3 | 4253 | ext4_lblk_t last_block; |
a86c6181 | 4254 | handle_t *handle; |
189e868f | 4255 | loff_t page_len; |
a86c6181 AT |
4256 | int err = 0; |
4257 | ||
3889fd57 JZ |
4258 | /* |
4259 | * finish any pending end_io work so we won't run the risk of | |
4260 | * converting any truncated blocks to initialized later | |
4261 | */ | |
c278531d | 4262 | ext4_flush_unwritten_io(inode); |
3889fd57 | 4263 | |
a86c6181 AT |
4264 | /* |
4265 | * probably first extent we're gonna free will be last in block | |
4266 | */ | |
f3bd1f3f | 4267 | err = ext4_writepage_trans_blocks(inode); |
a86c6181 | 4268 | handle = ext4_journal_start(inode, err); |
cf108bca | 4269 | if (IS_ERR(handle)) |
a86c6181 | 4270 | return; |
a86c6181 | 4271 | |
189e868f AH |
4272 | if (inode->i_size % PAGE_CACHE_SIZE != 0) { |
4273 | page_len = PAGE_CACHE_SIZE - | |
4274 | (inode->i_size & (PAGE_CACHE_SIZE - 1)); | |
4275 | ||
4276 | err = ext4_discard_partial_page_buffers(handle, | |
4277 | mapping, inode->i_size, page_len, 0); | |
4278 | ||
4279 | if (err) | |
4280 | goto out_stop; | |
4281 | } | |
a86c6181 | 4282 | |
9ddfc3dc JK |
4283 | if (ext4_orphan_add(handle, inode)) |
4284 | goto out_stop; | |
4285 | ||
0e855ac8 | 4286 | down_write(&EXT4_I(inode)->i_data_sem); |
a86c6181 AT |
4287 | ext4_ext_invalidate_cache(inode); |
4288 | ||
c2ea3fde | 4289 | ext4_discard_preallocations(inode); |
c9de560d | 4290 | |
a86c6181 | 4291 | /* |
d0d856e8 RD |
4292 | * TODO: optimization is possible here. |
4293 | * Probably we need not scan at all, | |
4294 | * because page truncation is enough. | |
a86c6181 | 4295 | */ |
a86c6181 AT |
4296 | |
4297 | /* we have to know where to truncate from in crash case */ | |
4298 | EXT4_I(inode)->i_disksize = inode->i_size; | |
4299 | ext4_mark_inode_dirty(handle, inode); | |
4300 | ||
4301 | last_block = (inode->i_size + sb->s_blocksize - 1) | |
4302 | >> EXT4_BLOCK_SIZE_BITS(sb); | |
51865fda ZL |
4303 | err = ext4_es_remove_extent(inode, last_block, |
4304 | EXT_MAX_BLOCKS - last_block); | |
5f95d21f | 4305 | err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1); |
a86c6181 AT |
4306 | |
4307 | /* In a multi-transaction truncate, we only make the final | |
56055d3a AA |
4308 | * transaction synchronous. |
4309 | */ | |
a86c6181 | 4310 | if (IS_SYNC(inode)) |
0390131b | 4311 | ext4_handle_sync(handle); |
a86c6181 | 4312 | |
9ddfc3dc | 4313 | up_write(&EXT4_I(inode)->i_data_sem); |
f6d2f6b3 EG |
4314 | |
4315 | out_stop: | |
a86c6181 | 4316 | /* |
d0d856e8 | 4317 | * If this was a simple ftruncate() and the file will remain alive, |
a86c6181 AT |
4318 | * then we need to clear up the orphan record which we created above. |
4319 | * However, if this was a real unlink then we were called by | |
4320 | * ext4_delete_inode(), and we allow that function to clean up the | |
4321 | * orphan info for us. | |
4322 | */ | |
4323 | if (inode->i_nlink) | |
4324 | ext4_orphan_del(handle, inode); | |
4325 | ||
ef737728 SR |
4326 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
4327 | ext4_mark_inode_dirty(handle, inode); | |
a86c6181 AT |
4328 | ext4_journal_stop(handle); |
4329 | } | |
4330 | ||
fd28784a AK |
4331 | static void ext4_falloc_update_inode(struct inode *inode, |
4332 | int mode, loff_t new_size, int update_ctime) | |
4333 | { | |
4334 | struct timespec now; | |
4335 | ||
4336 | if (update_ctime) { | |
4337 | now = current_fs_time(inode->i_sb); | |
4338 | if (!timespec_equal(&inode->i_ctime, &now)) | |
4339 | inode->i_ctime = now; | |
4340 | } | |
4341 | /* | |
4342 | * Update only when preallocation was requested beyond | |
4343 | * the file size. | |
4344 | */ | |
cf17fea6 AK |
4345 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
4346 | if (new_size > i_size_read(inode)) | |
4347 | i_size_write(inode, new_size); | |
4348 | if (new_size > EXT4_I(inode)->i_disksize) | |
4349 | ext4_update_i_disksize(inode, new_size); | |
c8d46e41 JZ |
4350 | } else { |
4351 | /* | |
4352 | * Mark that we allocate beyond EOF so the subsequent truncate | |
4353 | * can proceed even if the new size is the same as i_size. | |
4354 | */ | |
4355 | if (new_size > i_size_read(inode)) | |
12e9b892 | 4356 | ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
fd28784a AK |
4357 | } |
4358 | ||
4359 | } | |
4360 | ||
a2df2a63 | 4361 | /* |
2fe17c10 | 4362 | * preallocate space for a file. This implements ext4's fallocate file |
a2df2a63 AA |
4363 | * operation, which gets called from sys_fallocate system call. |
4364 | * For block-mapped files, posix_fallocate should fall back to the method | |
4365 | * of writing zeroes to the required new blocks (the same behavior which is | |
4366 | * expected for file systems which do not support fallocate() system call). | |
4367 | */ | |
2fe17c10 | 4368 | long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
a2df2a63 | 4369 | { |
2fe17c10 | 4370 | struct inode *inode = file->f_path.dentry->d_inode; |
a2df2a63 | 4371 | handle_t *handle; |
fd28784a | 4372 | loff_t new_size; |
498e5f24 | 4373 | unsigned int max_blocks; |
a2df2a63 AA |
4374 | int ret = 0; |
4375 | int ret2 = 0; | |
4376 | int retries = 0; | |
a4e5d88b | 4377 | int flags; |
2ed88685 | 4378 | struct ext4_map_blocks map; |
a2df2a63 AA |
4379 | unsigned int credits, blkbits = inode->i_blkbits; |
4380 | ||
4381 | /* | |
4382 | * currently supporting (pre)allocate mode for extent-based | |
4383 | * files _only_ | |
4384 | */ | |
12e9b892 | 4385 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
a2df2a63 AA |
4386 | return -EOPNOTSUPP; |
4387 | ||
a4bb6b64 AH |
4388 | /* Return error if mode is not supported */ |
4389 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
4390 | return -EOPNOTSUPP; | |
4391 | ||
4392 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
4393 | return ext4_punch_hole(file, offset, len); | |
4394 | ||
0562e0ba | 4395 | trace_ext4_fallocate_enter(inode, offset, len, mode); |
2ed88685 | 4396 | map.m_lblk = offset >> blkbits; |
fd28784a AK |
4397 | /* |
4398 | * We can't just convert len to max_blocks because | |
4399 | * If blocksize = 4096 offset = 3072 and len = 2048 | |
4400 | */ | |
a2df2a63 | 4401 | max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) |
2ed88685 | 4402 | - map.m_lblk; |
a2df2a63 | 4403 | /* |
f3bd1f3f | 4404 | * credits to insert 1 extent into extent tree |
a2df2a63 | 4405 | */ |
f3bd1f3f | 4406 | credits = ext4_chunk_trans_blocks(inode, max_blocks); |
55bd725a | 4407 | mutex_lock(&inode->i_mutex); |
6d19c42b NK |
4408 | ret = inode_newsize_ok(inode, (len + offset)); |
4409 | if (ret) { | |
4410 | mutex_unlock(&inode->i_mutex); | |
0562e0ba | 4411 | trace_ext4_fallocate_exit(inode, offset, max_blocks, ret); |
6d19c42b NK |
4412 | return ret; |
4413 | } | |
3c6fe770 | 4414 | flags = EXT4_GET_BLOCKS_CREATE_UNINIT_EXT; |
a4e5d88b DM |
4415 | if (mode & FALLOC_FL_KEEP_SIZE) |
4416 | flags |= EXT4_GET_BLOCKS_KEEP_SIZE; | |
3c6fe770 GH |
4417 | /* |
4418 | * Don't normalize the request if it can fit in one extent so | |
4419 | * that it doesn't get unnecessarily split into multiple | |
4420 | * extents. | |
4421 | */ | |
4422 | if (len <= EXT_UNINIT_MAX_LEN << blkbits) | |
4423 | flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; | |
60d4616f DM |
4424 | |
4425 | /* Prevent race condition between unwritten */ | |
4426 | ext4_flush_unwritten_io(inode); | |
a2df2a63 AA |
4427 | retry: |
4428 | while (ret >= 0 && ret < max_blocks) { | |
2ed88685 TT |
4429 | map.m_lblk = map.m_lblk + ret; |
4430 | map.m_len = max_blocks = max_blocks - ret; | |
a2df2a63 AA |
4431 | handle = ext4_journal_start(inode, credits); |
4432 | if (IS_ERR(handle)) { | |
4433 | ret = PTR_ERR(handle); | |
4434 | break; | |
4435 | } | |
a4e5d88b | 4436 | ret = ext4_map_blocks(handle, inode, &map, flags); |
221879c9 | 4437 | if (ret <= 0) { |
2c98615d AK |
4438 | #ifdef EXT4FS_DEBUG |
4439 | WARN_ON(ret <= 0); | |
e35fd660 | 4440 | printk(KERN_ERR "%s: ext4_ext_map_blocks " |
2c98615d | 4441 | "returned error inode#%lu, block=%u, " |
9fd9784c | 4442 | "max_blocks=%u", __func__, |
a6371b63 | 4443 | inode->i_ino, map.m_lblk, max_blocks); |
2c98615d | 4444 | #endif |
a2df2a63 AA |
4445 | ext4_mark_inode_dirty(handle, inode); |
4446 | ret2 = ext4_journal_stop(handle); | |
4447 | break; | |
4448 | } | |
2ed88685 | 4449 | if ((map.m_lblk + ret) >= (EXT4_BLOCK_ALIGN(offset + len, |
fd28784a AK |
4450 | blkbits) >> blkbits)) |
4451 | new_size = offset + len; | |
4452 | else | |
29ae07b7 | 4453 | new_size = ((loff_t) map.m_lblk + ret) << blkbits; |
a2df2a63 | 4454 | |
fd28784a | 4455 | ext4_falloc_update_inode(inode, mode, new_size, |
2ed88685 | 4456 | (map.m_flags & EXT4_MAP_NEW)); |
a2df2a63 | 4457 | ext4_mark_inode_dirty(handle, inode); |
f4e95b33 ZL |
4458 | if ((file->f_flags & O_SYNC) && ret >= max_blocks) |
4459 | ext4_handle_sync(handle); | |
a2df2a63 AA |
4460 | ret2 = ext4_journal_stop(handle); |
4461 | if (ret2) | |
4462 | break; | |
4463 | } | |
fd28784a AK |
4464 | if (ret == -ENOSPC && |
4465 | ext4_should_retry_alloc(inode->i_sb, &retries)) { | |
4466 | ret = 0; | |
a2df2a63 | 4467 | goto retry; |
a2df2a63 | 4468 | } |
55bd725a | 4469 | mutex_unlock(&inode->i_mutex); |
0562e0ba JZ |
4470 | trace_ext4_fallocate_exit(inode, offset, max_blocks, |
4471 | ret > 0 ? ret2 : ret); | |
a2df2a63 AA |
4472 | return ret > 0 ? ret2 : ret; |
4473 | } | |
6873fa0d | 4474 | |
0031462b MC |
4475 | /* |
4476 | * This function convert a range of blocks to written extents | |
4477 | * The caller of this function will pass the start offset and the size. | |
4478 | * all unwritten extents within this range will be converted to | |
4479 | * written extents. | |
4480 | * | |
4481 | * This function is called from the direct IO end io call back | |
4482 | * function, to convert the fallocated extents after IO is completed. | |
109f5565 | 4483 | * Returns 0 on success. |
0031462b MC |
4484 | */ |
4485 | int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, | |
a1de02dc | 4486 | ssize_t len) |
0031462b MC |
4487 | { |
4488 | handle_t *handle; | |
0031462b MC |
4489 | unsigned int max_blocks; |
4490 | int ret = 0; | |
4491 | int ret2 = 0; | |
2ed88685 | 4492 | struct ext4_map_blocks map; |
0031462b MC |
4493 | unsigned int credits, blkbits = inode->i_blkbits; |
4494 | ||
2ed88685 | 4495 | map.m_lblk = offset >> blkbits; |
0031462b MC |
4496 | /* |
4497 | * We can't just convert len to max_blocks because | |
4498 | * If blocksize = 4096 offset = 3072 and len = 2048 | |
4499 | */ | |
2ed88685 TT |
4500 | max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) - |
4501 | map.m_lblk); | |
0031462b MC |
4502 | /* |
4503 | * credits to insert 1 extent into extent tree | |
4504 | */ | |
4505 | credits = ext4_chunk_trans_blocks(inode, max_blocks); | |
4506 | while (ret >= 0 && ret < max_blocks) { | |
2ed88685 TT |
4507 | map.m_lblk += ret; |
4508 | map.m_len = (max_blocks -= ret); | |
0031462b MC |
4509 | handle = ext4_journal_start(inode, credits); |
4510 | if (IS_ERR(handle)) { | |
4511 | ret = PTR_ERR(handle); | |
4512 | break; | |
4513 | } | |
2ed88685 | 4514 | ret = ext4_map_blocks(handle, inode, &map, |
c7064ef1 | 4515 | EXT4_GET_BLOCKS_IO_CONVERT_EXT); |
0031462b MC |
4516 | if (ret <= 0) { |
4517 | WARN_ON(ret <= 0); | |
92b97816 TT |
4518 | ext4_msg(inode->i_sb, KERN_ERR, |
4519 | "%s:%d: inode #%lu: block %u: len %u: " | |
4520 | "ext4_ext_map_blocks returned %d", | |
4521 | __func__, __LINE__, inode->i_ino, map.m_lblk, | |
4522 | map.m_len, ret); | |
0031462b MC |
4523 | } |
4524 | ext4_mark_inode_dirty(handle, inode); | |
4525 | ret2 = ext4_journal_stop(handle); | |
4526 | if (ret <= 0 || ret2 ) | |
4527 | break; | |
4528 | } | |
4529 | return ret > 0 ? ret2 : ret; | |
4530 | } | |
6d9c85eb | 4531 | |
6873fa0d | 4532 | /* |
91dd8c11 LC |
4533 | * If newex is not existing extent (newex->ec_start equals zero) find |
4534 | * delayed extent at start of newex and update newex accordingly and | |
4535 | * return start of the next delayed extent. | |
4536 | * | |
4537 | * If newex is existing extent (newex->ec_start is not equal zero) | |
4538 | * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed | |
4539 | * extent found. Leave newex unmodified. | |
6873fa0d | 4540 | */ |
91dd8c11 LC |
4541 | static int ext4_find_delayed_extent(struct inode *inode, |
4542 | struct ext4_ext_cache *newex) | |
6873fa0d | 4543 | { |
b3aff3e3 | 4544 | struct extent_status es; |
b3aff3e3 | 4545 | ext4_lblk_t next_del; |
6873fa0d | 4546 | |
b3aff3e3 ZL |
4547 | es.start = newex->ec_block; |
4548 | next_del = ext4_es_find_extent(inode, &es); | |
6873fa0d | 4549 | |
b05e6ae5 | 4550 | if (newex->ec_start == 0) { |
6d9c85eb YY |
4551 | /* |
4552 | * No extent in extent-tree contains block @newex->ec_start, | |
4553 | * then the block may stay in 1)a hole or 2)delayed-extent. | |
6d9c85eb | 4554 | */ |
b3aff3e3 ZL |
4555 | if (es.len == 0) |
4556 | /* A hole found. */ | |
91dd8c11 | 4557 | return 0; |
b3aff3e3 ZL |
4558 | |
4559 | if (es.start > newex->ec_block) { | |
4560 | /* A hole found. */ | |
4561 | newex->ec_len = min(es.start - newex->ec_block, | |
4562 | newex->ec_len); | |
91dd8c11 | 4563 | return 0; |
6873fa0d | 4564 | } |
6d9c85eb | 4565 | |
b3aff3e3 | 4566 | newex->ec_len = es.start + es.len - newex->ec_block; |
6873fa0d ES |
4567 | } |
4568 | ||
91dd8c11 | 4569 | return next_del; |
6873fa0d | 4570 | } |
6873fa0d ES |
4571 | /* fiemap flags we can handle specified here */ |
4572 | #define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) | |
4573 | ||
3a06d778 AK |
4574 | static int ext4_xattr_fiemap(struct inode *inode, |
4575 | struct fiemap_extent_info *fieinfo) | |
6873fa0d ES |
4576 | { |
4577 | __u64 physical = 0; | |
4578 | __u64 length; | |
4579 | __u32 flags = FIEMAP_EXTENT_LAST; | |
4580 | int blockbits = inode->i_sb->s_blocksize_bits; | |
4581 | int error = 0; | |
4582 | ||
4583 | /* in-inode? */ | |
19f5fb7a | 4584 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
6873fa0d ES |
4585 | struct ext4_iloc iloc; |
4586 | int offset; /* offset of xattr in inode */ | |
4587 | ||
4588 | error = ext4_get_inode_loc(inode, &iloc); | |
4589 | if (error) | |
4590 | return error; | |
4591 | physical = iloc.bh->b_blocknr << blockbits; | |
4592 | offset = EXT4_GOOD_OLD_INODE_SIZE + | |
4593 | EXT4_I(inode)->i_extra_isize; | |
4594 | physical += offset; | |
4595 | length = EXT4_SB(inode->i_sb)->s_inode_size - offset; | |
4596 | flags |= FIEMAP_EXTENT_DATA_INLINE; | |
fd2dd9fb | 4597 | brelse(iloc.bh); |
6873fa0d ES |
4598 | } else { /* external block */ |
4599 | physical = EXT4_I(inode)->i_file_acl << blockbits; | |
4600 | length = inode->i_sb->s_blocksize; | |
4601 | } | |
4602 | ||
4603 | if (physical) | |
4604 | error = fiemap_fill_next_extent(fieinfo, 0, physical, | |
4605 | length, flags); | |
4606 | return (error < 0 ? error : 0); | |
4607 | } | |
4608 | ||
a4bb6b64 AH |
4609 | /* |
4610 | * ext4_ext_punch_hole | |
4611 | * | |
4612 | * Punches a hole of "length" bytes in a file starting | |
4613 | * at byte "offset" | |
4614 | * | |
4615 | * @inode: The inode of the file to punch a hole in | |
4616 | * @offset: The starting byte offset of the hole | |
4617 | * @length: The length of the hole | |
4618 | * | |
4619 | * Returns the number of blocks removed or negative on err | |
4620 | */ | |
4621 | int ext4_ext_punch_hole(struct file *file, loff_t offset, loff_t length) | |
4622 | { | |
4623 | struct inode *inode = file->f_path.dentry->d_inode; | |
4624 | struct super_block *sb = inode->i_sb; | |
5f95d21f | 4625 | ext4_lblk_t first_block, stop_block; |
a4bb6b64 | 4626 | struct address_space *mapping = inode->i_mapping; |
a4bb6b64 | 4627 | handle_t *handle; |
ba06208a AH |
4628 | loff_t first_page, last_page, page_len; |
4629 | loff_t first_page_offset, last_page_offset; | |
5f95d21f | 4630 | int credits, err = 0; |
a4bb6b64 | 4631 | |
02d262df DM |
4632 | /* |
4633 | * Write out all dirty pages to avoid race conditions | |
4634 | * Then release them. | |
4635 | */ | |
4636 | if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { | |
4637 | err = filemap_write_and_wait_range(mapping, | |
4638 | offset, offset + length - 1); | |
4639 | ||
4640 | if (err) | |
4641 | return err; | |
4642 | } | |
4643 | ||
4644 | mutex_lock(&inode->i_mutex); | |
4645 | /* It's not possible punch hole on append only file */ | |
4646 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) { | |
4647 | err = -EPERM; | |
4648 | goto out_mutex; | |
4649 | } | |
4650 | if (IS_SWAPFILE(inode)) { | |
4651 | err = -ETXTBSY; | |
4652 | goto out_mutex; | |
4653 | } | |
4654 | ||
2be4751b AH |
4655 | /* No need to punch hole beyond i_size */ |
4656 | if (offset >= inode->i_size) | |
02d262df | 4657 | goto out_mutex; |
2be4751b AH |
4658 | |
4659 | /* | |
4660 | * If the hole extends beyond i_size, set the hole | |
4661 | * to end after the page that contains i_size | |
4662 | */ | |
4663 | if (offset + length > inode->i_size) { | |
4664 | length = inode->i_size + | |
4665 | PAGE_CACHE_SIZE - (inode->i_size & (PAGE_CACHE_SIZE - 1)) - | |
4666 | offset; | |
4667 | } | |
4668 | ||
a4bb6b64 AH |
4669 | first_page = (offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
4670 | last_page = (offset + length) >> PAGE_CACHE_SHIFT; | |
4671 | ||
4672 | first_page_offset = first_page << PAGE_CACHE_SHIFT; | |
4673 | last_page_offset = last_page << PAGE_CACHE_SHIFT; | |
4674 | ||
a4bb6b64 AH |
4675 | /* Now release the pages */ |
4676 | if (last_page_offset > first_page_offset) { | |
5e44f8c3 HD |
4677 | truncate_pagecache_range(inode, first_page_offset, |
4678 | last_page_offset - 1); | |
a4bb6b64 AH |
4679 | } |
4680 | ||
02d262df DM |
4681 | /* Wait all existing dio workers, newcomers will block on i_mutex */ |
4682 | ext4_inode_block_unlocked_dio(inode); | |
c278531d | 4683 | err = ext4_flush_unwritten_io(inode); |
28a535f9 | 4684 | if (err) |
02d262df | 4685 | goto out_dio; |
c278531d | 4686 | inode_dio_wait(inode); |
a4bb6b64 AH |
4687 | |
4688 | credits = ext4_writepage_trans_blocks(inode); | |
4689 | handle = ext4_journal_start(inode, credits); | |
02d262df DM |
4690 | if (IS_ERR(handle)) { |
4691 | err = PTR_ERR(handle); | |
4692 | goto out_dio; | |
4693 | } | |
a4bb6b64 | 4694 | |
a4bb6b64 AH |
4695 | |
4696 | /* | |
ba06208a AH |
4697 | * Now we need to zero out the non-page-aligned data in the |
4698 | * pages at the start and tail of the hole, and unmap the buffer | |
4699 | * heads for the block aligned regions of the page that were | |
4700 | * completely zeroed. | |
a4bb6b64 | 4701 | */ |
ba06208a AH |
4702 | if (first_page > last_page) { |
4703 | /* | |
4704 | * If the file space being truncated is contained within a page | |
4705 | * just zero out and unmap the middle of that page | |
4706 | */ | |
4707 | err = ext4_discard_partial_page_buffers(handle, | |
4708 | mapping, offset, length, 0); | |
4709 | ||
4710 | if (err) | |
4711 | goto out; | |
4712 | } else { | |
4713 | /* | |
4714 | * zero out and unmap the partial page that contains | |
4715 | * the start of the hole | |
4716 | */ | |
4717 | page_len = first_page_offset - offset; | |
4718 | if (page_len > 0) { | |
4719 | err = ext4_discard_partial_page_buffers(handle, mapping, | |
4720 | offset, page_len, 0); | |
4721 | if (err) | |
4722 | goto out; | |
4723 | } | |
4724 | ||
4725 | /* | |
4726 | * zero out and unmap the partial page that contains | |
4727 | * the end of the hole | |
4728 | */ | |
4729 | page_len = offset + length - last_page_offset; | |
4730 | if (page_len > 0) { | |
4731 | err = ext4_discard_partial_page_buffers(handle, mapping, | |
4732 | last_page_offset, page_len, 0); | |
4733 | if (err) | |
4734 | goto out; | |
a4bb6b64 AH |
4735 | } |
4736 | } | |
4737 | ||
2be4751b AH |
4738 | /* |
4739 | * If i_size is contained in the last page, we need to | |
4740 | * unmap and zero the partial page after i_size | |
4741 | */ | |
4742 | if (inode->i_size >> PAGE_CACHE_SHIFT == last_page && | |
4743 | inode->i_size % PAGE_CACHE_SIZE != 0) { | |
4744 | ||
4745 | page_len = PAGE_CACHE_SIZE - | |
4746 | (inode->i_size & (PAGE_CACHE_SIZE - 1)); | |
4747 | ||
4748 | if (page_len > 0) { | |
4749 | err = ext4_discard_partial_page_buffers(handle, | |
4750 | mapping, inode->i_size, page_len, 0); | |
4751 | ||
4752 | if (err) | |
4753 | goto out; | |
4754 | } | |
4755 | } | |
4756 | ||
5f95d21f LC |
4757 | first_block = (offset + sb->s_blocksize - 1) >> |
4758 | EXT4_BLOCK_SIZE_BITS(sb); | |
4759 | stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb); | |
4760 | ||
a4bb6b64 | 4761 | /* If there are no blocks to remove, return now */ |
5f95d21f | 4762 | if (first_block >= stop_block) |
a4bb6b64 AH |
4763 | goto out; |
4764 | ||
4765 | down_write(&EXT4_I(inode)->i_data_sem); | |
4766 | ext4_ext_invalidate_cache(inode); | |
4767 | ext4_discard_preallocations(inode); | |
4768 | ||
51865fda ZL |
4769 | err = ext4_es_remove_extent(inode, first_block, |
4770 | stop_block - first_block); | |
5f95d21f | 4771 | err = ext4_ext_remove_space(inode, first_block, stop_block - 1); |
a4bb6b64 | 4772 | |
5f95d21f LC |
4773 | ext4_ext_invalidate_cache(inode); |
4774 | ext4_discard_preallocations(inode); | |
a4bb6b64 AH |
4775 | |
4776 | if (IS_SYNC(inode)) | |
4777 | ext4_handle_sync(handle); | |
4778 | ||
4779 | up_write(&EXT4_I(inode)->i_data_sem); | |
4780 | ||
4781 | out: | |
a4bb6b64 AH |
4782 | inode->i_mtime = inode->i_ctime = ext4_current_time(inode); |
4783 | ext4_mark_inode_dirty(handle, inode); | |
4784 | ext4_journal_stop(handle); | |
02d262df DM |
4785 | out_dio: |
4786 | ext4_inode_resume_unlocked_dio(inode); | |
4787 | out_mutex: | |
4788 | mutex_unlock(&inode->i_mutex); | |
a4bb6b64 AH |
4789 | return err; |
4790 | } | |
91dd8c11 | 4791 | |
6873fa0d ES |
4792 | int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
4793 | __u64 start, __u64 len) | |
4794 | { | |
4795 | ext4_lblk_t start_blk; | |
6873fa0d ES |
4796 | int error = 0; |
4797 | ||
4798 | /* fallback to generic here if not in extents fmt */ | |
12e9b892 | 4799 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
6873fa0d ES |
4800 | return generic_block_fiemap(inode, fieinfo, start, len, |
4801 | ext4_get_block); | |
4802 | ||
4803 | if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS)) | |
4804 | return -EBADR; | |
4805 | ||
4806 | if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { | |
4807 | error = ext4_xattr_fiemap(inode, fieinfo); | |
4808 | } else { | |
aca92ff6 LM |
4809 | ext4_lblk_t len_blks; |
4810 | __u64 last_blk; | |
4811 | ||
6873fa0d | 4812 | start_blk = start >> inode->i_sb->s_blocksize_bits; |
aca92ff6 | 4813 | last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits; |
f17722f9 LC |
4814 | if (last_blk >= EXT_MAX_BLOCKS) |
4815 | last_blk = EXT_MAX_BLOCKS-1; | |
aca92ff6 | 4816 | len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1; |
6873fa0d ES |
4817 | |
4818 | /* | |
91dd8c11 LC |
4819 | * Walk the extent tree gathering extent information |
4820 | * and pushing extents back to the user. | |
6873fa0d | 4821 | */ |
91dd8c11 LC |
4822 | error = ext4_fill_fiemap_extents(inode, start_blk, |
4823 | len_blks, fieinfo); | |
6873fa0d ES |
4824 | } |
4825 | ||
4826 | return error; | |
4827 | } |