Commit | Line | Data |
---|---|---|
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" |
f19d5870 | 45 | #include "xattr.h" |
a86c6181 | 46 | |
0562e0ba JZ |
47 | #include <trace/events/ext4.h> |
48 | ||
5f95d21f LC |
49 | /* |
50 | * used by extent splitting. | |
51 | */ | |
52 | #define EXT4_EXT_MAY_ZEROOUT 0x1 /* safe to zeroout if split fails \ | |
53 | due to ENOSPC */ | |
54 | #define EXT4_EXT_MARK_UNINIT1 0x2 /* mark first half uninitialized */ | |
55 | #define EXT4_EXT_MARK_UNINIT2 0x4 /* mark second half uninitialized */ | |
56 | ||
dee1f973 DM |
57 | #define EXT4_EXT_DATA_VALID1 0x8 /* first half contains valid data */ |
58 | #define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */ | |
59 | ||
7ac5990d DW |
60 | static __le32 ext4_extent_block_csum(struct inode *inode, |
61 | struct ext4_extent_header *eh) | |
62 | { | |
63 | struct ext4_inode_info *ei = EXT4_I(inode); | |
64 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
65 | __u32 csum; | |
66 | ||
67 | csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)eh, | |
68 | EXT4_EXTENT_TAIL_OFFSET(eh)); | |
69 | return cpu_to_le32(csum); | |
70 | } | |
71 | ||
72 | static int ext4_extent_block_csum_verify(struct inode *inode, | |
73 | struct ext4_extent_header *eh) | |
74 | { | |
75 | struct ext4_extent_tail *et; | |
76 | ||
77 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
78 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
79 | return 1; | |
80 | ||
81 | et = find_ext4_extent_tail(eh); | |
82 | if (et->et_checksum != ext4_extent_block_csum(inode, eh)) | |
83 | return 0; | |
84 | return 1; | |
85 | } | |
86 | ||
87 | static void ext4_extent_block_csum_set(struct inode *inode, | |
88 | struct ext4_extent_header *eh) | |
89 | { | |
90 | struct ext4_extent_tail *et; | |
91 | ||
92 | if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, | |
93 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) | |
94 | return; | |
95 | ||
96 | et = find_ext4_extent_tail(eh); | |
97 | et->et_checksum = ext4_extent_block_csum(inode, eh); | |
98 | } | |
99 | ||
d583fb87 AH |
100 | static int ext4_split_extent(handle_t *handle, |
101 | struct inode *inode, | |
102 | struct ext4_ext_path *path, | |
103 | struct ext4_map_blocks *map, | |
104 | int split_flag, | |
105 | int flags); | |
106 | ||
5f95d21f LC |
107 | static int ext4_split_extent_at(handle_t *handle, |
108 | struct inode *inode, | |
109 | struct ext4_ext_path *path, | |
110 | ext4_lblk_t split, | |
111 | int split_flag, | |
112 | int flags); | |
113 | ||
91dd8c11 | 114 | static int ext4_find_delayed_extent(struct inode *inode, |
69eb33dc | 115 | struct extent_status *newes); |
91dd8c11 | 116 | |
487caeef JK |
117 | static int ext4_ext_truncate_extend_restart(handle_t *handle, |
118 | struct inode *inode, | |
119 | int needed) | |
a86c6181 AT |
120 | { |
121 | int err; | |
122 | ||
0390131b FM |
123 | if (!ext4_handle_valid(handle)) |
124 | return 0; | |
a86c6181 | 125 | if (handle->h_buffer_credits > needed) |
9102e4fa SF |
126 | return 0; |
127 | err = ext4_journal_extend(handle, needed); | |
0123c939 | 128 | if (err <= 0) |
9102e4fa | 129 | return err; |
487caeef | 130 | err = ext4_truncate_restart_trans(handle, inode, needed); |
0617b83f DM |
131 | if (err == 0) |
132 | err = -EAGAIN; | |
487caeef JK |
133 | |
134 | return err; | |
a86c6181 AT |
135 | } |
136 | ||
137 | /* | |
138 | * could return: | |
139 | * - EROFS | |
140 | * - ENOMEM | |
141 | */ | |
142 | static int ext4_ext_get_access(handle_t *handle, struct inode *inode, | |
143 | struct ext4_ext_path *path) | |
144 | { | |
145 | if (path->p_bh) { | |
146 | /* path points to block */ | |
147 | return ext4_journal_get_write_access(handle, path->p_bh); | |
148 | } | |
149 | /* path points to leaf/index in inode body */ | |
150 | /* we use in-core data, no need to protect them */ | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * could return: | |
156 | * - EROFS | |
157 | * - ENOMEM | |
158 | * - EIO | |
159 | */ | |
2656497b DW |
160 | int __ext4_ext_dirty(const char *where, unsigned int line, handle_t *handle, |
161 | struct inode *inode, struct ext4_ext_path *path) | |
a86c6181 AT |
162 | { |
163 | int err; | |
164 | if (path->p_bh) { | |
7ac5990d | 165 | ext4_extent_block_csum_set(inode, ext_block_hdr(path->p_bh)); |
a86c6181 | 166 | /* path points to block */ |
9ea7a0df TT |
167 | err = __ext4_handle_dirty_metadata(where, line, handle, |
168 | inode, path->p_bh); | |
a86c6181 AT |
169 | } else { |
170 | /* path points to leaf/index in inode body */ | |
171 | err = ext4_mark_inode_dirty(handle, inode); | |
172 | } | |
173 | return err; | |
174 | } | |
175 | ||
f65e6fba | 176 | static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode, |
a86c6181 | 177 | struct ext4_ext_path *path, |
725d26d3 | 178 | ext4_lblk_t block) |
a86c6181 | 179 | { |
a86c6181 | 180 | if (path) { |
81fdbb4a | 181 | int depth = path->p_depth; |
a86c6181 | 182 | struct ext4_extent *ex; |
a86c6181 | 183 | |
ad4fb9ca KM |
184 | /* |
185 | * Try to predict block placement assuming that we are | |
186 | * filling in a file which will eventually be | |
187 | * non-sparse --- i.e., in the case of libbfd writing | |
188 | * an ELF object sections out-of-order but in a way | |
189 | * the eventually results in a contiguous object or | |
190 | * executable file, or some database extending a table | |
191 | * space file. However, this is actually somewhat | |
192 | * non-ideal if we are writing a sparse file such as | |
193 | * qemu or KVM writing a raw image file that is going | |
194 | * to stay fairly sparse, since it will end up | |
195 | * fragmenting the file system's free space. Maybe we | |
196 | * should have some hueristics or some way to allow | |
197 | * userspace to pass a hint to file system, | |
b8d6568a | 198 | * especially if the latter case turns out to be |
ad4fb9ca KM |
199 | * common. |
200 | */ | |
7e028976 | 201 | ex = path[depth].p_ext; |
ad4fb9ca KM |
202 | if (ex) { |
203 | ext4_fsblk_t ext_pblk = ext4_ext_pblock(ex); | |
204 | ext4_lblk_t ext_block = le32_to_cpu(ex->ee_block); | |
205 | ||
206 | if (block > ext_block) | |
207 | return ext_pblk + (block - ext_block); | |
208 | else | |
209 | return ext_pblk - (ext_block - block); | |
210 | } | |
a86c6181 | 211 | |
d0d856e8 RD |
212 | /* it looks like index is empty; |
213 | * try to find starting block from index itself */ | |
a86c6181 AT |
214 | if (path[depth].p_bh) |
215 | return path[depth].p_bh->b_blocknr; | |
216 | } | |
217 | ||
218 | /* OK. use inode's group */ | |
f86186b4 | 219 | return ext4_inode_to_goal_block(inode); |
a86c6181 AT |
220 | } |
221 | ||
654b4908 AK |
222 | /* |
223 | * Allocation for a meta data block | |
224 | */ | |
f65e6fba | 225 | static ext4_fsblk_t |
654b4908 | 226 | ext4_ext_new_meta_block(handle_t *handle, struct inode *inode, |
a86c6181 | 227 | struct ext4_ext_path *path, |
55f020db | 228 | struct ext4_extent *ex, int *err, unsigned int flags) |
a86c6181 | 229 | { |
f65e6fba | 230 | ext4_fsblk_t goal, newblock; |
a86c6181 AT |
231 | |
232 | goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block)); | |
55f020db AH |
233 | newblock = ext4_new_meta_blocks(handle, inode, goal, flags, |
234 | NULL, err); | |
a86c6181 AT |
235 | return newblock; |
236 | } | |
237 | ||
55ad63bf | 238 | static inline int ext4_ext_space_block(struct inode *inode, int check) |
a86c6181 AT |
239 | { |
240 | int size; | |
241 | ||
242 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) | |
243 | / sizeof(struct ext4_extent); | |
bbf2f9fb | 244 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
245 | if (!check && size > 6) |
246 | size = 6; | |
a86c6181 AT |
247 | #endif |
248 | return size; | |
249 | } | |
250 | ||
55ad63bf | 251 | static inline int ext4_ext_space_block_idx(struct inode *inode, int check) |
a86c6181 AT |
252 | { |
253 | int size; | |
254 | ||
255 | size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) | |
256 | / sizeof(struct ext4_extent_idx); | |
bbf2f9fb | 257 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
258 | if (!check && size > 5) |
259 | size = 5; | |
a86c6181 AT |
260 | #endif |
261 | return size; | |
262 | } | |
263 | ||
55ad63bf | 264 | static inline int ext4_ext_space_root(struct inode *inode, int check) |
a86c6181 AT |
265 | { |
266 | int size; | |
267 | ||
268 | size = sizeof(EXT4_I(inode)->i_data); | |
269 | size -= sizeof(struct ext4_extent_header); | |
270 | size /= sizeof(struct ext4_extent); | |
bbf2f9fb | 271 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
272 | if (!check && size > 3) |
273 | size = 3; | |
a86c6181 AT |
274 | #endif |
275 | return size; | |
276 | } | |
277 | ||
55ad63bf | 278 | static inline int ext4_ext_space_root_idx(struct inode *inode, int check) |
a86c6181 AT |
279 | { |
280 | int size; | |
281 | ||
282 | size = sizeof(EXT4_I(inode)->i_data); | |
283 | size -= sizeof(struct ext4_extent_header); | |
284 | size /= sizeof(struct ext4_extent_idx); | |
bbf2f9fb | 285 | #ifdef AGGRESSIVE_TEST |
02dc62fb YY |
286 | if (!check && size > 4) |
287 | size = 4; | |
a86c6181 AT |
288 | #endif |
289 | return size; | |
290 | } | |
291 | ||
d2a17637 MC |
292 | /* |
293 | * Calculate the number of metadata blocks needed | |
294 | * to allocate @blocks | |
295 | * Worse case is one block per extent | |
296 | */ | |
01f49d0b | 297 | int ext4_ext_calc_metadata_amount(struct inode *inode, ext4_lblk_t lblock) |
d2a17637 | 298 | { |
9d0be502 | 299 | struct ext4_inode_info *ei = EXT4_I(inode); |
81fdbb4a | 300 | int idxs; |
d2a17637 | 301 | |
9d0be502 TT |
302 | idxs = ((inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header)) |
303 | / sizeof(struct ext4_extent_idx)); | |
d2a17637 MC |
304 | |
305 | /* | |
9d0be502 TT |
306 | * If the new delayed allocation block is contiguous with the |
307 | * previous da block, it can share index blocks with the | |
308 | * previous block, so we only need to allocate a new index | |
309 | * block every idxs leaf blocks. At ldxs**2 blocks, we need | |
310 | * an additional index block, and at ldxs**3 blocks, yet | |
311 | * another index blocks. | |
d2a17637 | 312 | */ |
9d0be502 TT |
313 | if (ei->i_da_metadata_calc_len && |
314 | ei->i_da_metadata_calc_last_lblock+1 == lblock) { | |
81fdbb4a YY |
315 | int num = 0; |
316 | ||
9d0be502 TT |
317 | if ((ei->i_da_metadata_calc_len % idxs) == 0) |
318 | num++; | |
319 | if ((ei->i_da_metadata_calc_len % (idxs*idxs)) == 0) | |
320 | num++; | |
321 | if ((ei->i_da_metadata_calc_len % (idxs*idxs*idxs)) == 0) { | |
322 | num++; | |
323 | ei->i_da_metadata_calc_len = 0; | |
324 | } else | |
325 | ei->i_da_metadata_calc_len++; | |
326 | ei->i_da_metadata_calc_last_lblock++; | |
327 | return num; | |
328 | } | |
d2a17637 | 329 | |
9d0be502 TT |
330 | /* |
331 | * In the worst case we need a new set of index blocks at | |
332 | * every level of the inode's extent tree. | |
333 | */ | |
334 | ei->i_da_metadata_calc_len = 1; | |
335 | ei->i_da_metadata_calc_last_lblock = lblock; | |
336 | return ext_depth(inode) + 1; | |
d2a17637 MC |
337 | } |
338 | ||
c29c0ae7 AT |
339 | static int |
340 | ext4_ext_max_entries(struct inode *inode, int depth) | |
341 | { | |
342 | int max; | |
343 | ||
344 | if (depth == ext_depth(inode)) { | |
345 | if (depth == 0) | |
55ad63bf | 346 | max = ext4_ext_space_root(inode, 1); |
c29c0ae7 | 347 | else |
55ad63bf | 348 | max = ext4_ext_space_root_idx(inode, 1); |
c29c0ae7 AT |
349 | } else { |
350 | if (depth == 0) | |
55ad63bf | 351 | max = ext4_ext_space_block(inode, 1); |
c29c0ae7 | 352 | else |
55ad63bf | 353 | max = ext4_ext_space_block_idx(inode, 1); |
c29c0ae7 AT |
354 | } |
355 | ||
356 | return max; | |
357 | } | |
358 | ||
56b19868 AK |
359 | static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext) |
360 | { | |
bf89d16f | 361 | ext4_fsblk_t block = ext4_ext_pblock(ext); |
56b19868 | 362 | int len = ext4_ext_get_actual_len(ext); |
5946d089 EG |
363 | ext4_lblk_t lblock = le32_to_cpu(ext->ee_block); |
364 | ext4_lblk_t last = lblock + len - 1; | |
e84a26ce | 365 | |
5946d089 | 366 | if (lblock > last) |
31d4f3a2 | 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); |
5946d089 EG |
392 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; |
393 | ext4_fsblk_t pblock = 0; | |
394 | ext4_lblk_t lblock = 0; | |
395 | ext4_lblk_t prev = 0; | |
396 | int len = 0; | |
56b19868 AK |
397 | while (entries) { |
398 | if (!ext4_valid_extent(inode, ext)) | |
399 | return 0; | |
5946d089 EG |
400 | |
401 | /* Check for overlapping extents */ | |
402 | lblock = le32_to_cpu(ext->ee_block); | |
403 | len = ext4_ext_get_actual_len(ext); | |
404 | if ((lblock <= prev) && prev) { | |
405 | pblock = ext4_ext_pblock(ext); | |
406 | es->s_last_error_block = cpu_to_le64(pblock); | |
407 | return 0; | |
408 | } | |
56b19868 AK |
409 | ext++; |
410 | entries--; | |
5946d089 | 411 | prev = lblock + len - 1; |
56b19868 AK |
412 | } |
413 | } else { | |
81fdbb4a | 414 | struct ext4_extent_idx *ext_idx = EXT_FIRST_INDEX(eh); |
56b19868 AK |
415 | while (entries) { |
416 | if (!ext4_valid_extent_idx(inode, ext_idx)) | |
417 | return 0; | |
418 | ext_idx++; | |
419 | entries--; | |
420 | } | |
421 | } | |
422 | return 1; | |
423 | } | |
424 | ||
c398eda0 TT |
425 | static int __ext4_ext_check(const char *function, unsigned int line, |
426 | struct inode *inode, struct ext4_extent_header *eh, | |
c349179b | 427 | int depth, ext4_fsblk_t pblk) |
c29c0ae7 AT |
428 | { |
429 | const char *error_msg; | |
430 | int max = 0; | |
431 | ||
432 | if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) { | |
433 | error_msg = "invalid magic"; | |
434 | goto corrupted; | |
435 | } | |
436 | if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) { | |
437 | error_msg = "unexpected eh_depth"; | |
438 | goto corrupted; | |
439 | } | |
440 | if (unlikely(eh->eh_max == 0)) { | |
441 | error_msg = "invalid eh_max"; | |
442 | goto corrupted; | |
443 | } | |
444 | max = ext4_ext_max_entries(inode, depth); | |
445 | if (unlikely(le16_to_cpu(eh->eh_max) > max)) { | |
446 | error_msg = "too large eh_max"; | |
447 | goto corrupted; | |
448 | } | |
449 | if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) { | |
450 | error_msg = "invalid eh_entries"; | |
451 | goto corrupted; | |
452 | } | |
56b19868 AK |
453 | if (!ext4_valid_extent_entries(inode, eh, depth)) { |
454 | error_msg = "invalid extent entries"; | |
455 | goto corrupted; | |
456 | } | |
7ac5990d DW |
457 | /* Verify checksum on non-root extent tree nodes */ |
458 | if (ext_depth(inode) != depth && | |
459 | !ext4_extent_block_csum_verify(inode, eh)) { | |
460 | error_msg = "extent tree corrupted"; | |
461 | goto corrupted; | |
462 | } | |
c29c0ae7 AT |
463 | return 0; |
464 | ||
465 | corrupted: | |
c398eda0 | 466 | ext4_error_inode(inode, function, line, 0, |
c349179b TT |
467 | "pblk %llu bad header/extent: %s - magic %x, " |
468 | "entries %u, max %u(%u), depth %u(%u)", | |
469 | (unsigned long long) pblk, error_msg, | |
470 | le16_to_cpu(eh->eh_magic), | |
471 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max), | |
472 | max, le16_to_cpu(eh->eh_depth), depth); | |
c29c0ae7 AT |
473 | return -EIO; |
474 | } | |
475 | ||
c349179b TT |
476 | #define ext4_ext_check(inode, eh, depth, pblk) \ |
477 | __ext4_ext_check(__func__, __LINE__, (inode), (eh), (depth), (pblk)) | |
c29c0ae7 | 478 | |
7a262f7c AK |
479 | int ext4_ext_check_inode(struct inode *inode) |
480 | { | |
c349179b | 481 | return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode), 0); |
7a262f7c AK |
482 | } |
483 | ||
7d7ea89e TT |
484 | static struct buffer_head * |
485 | __read_extent_tree_block(const char *function, unsigned int line, | |
107a7bd3 TT |
486 | struct inode *inode, ext4_fsblk_t pblk, int depth, |
487 | int flags) | |
f8489128 | 488 | { |
7d7ea89e TT |
489 | struct buffer_head *bh; |
490 | int err; | |
491 | ||
492 | bh = sb_getblk(inode->i_sb, pblk); | |
493 | if (unlikely(!bh)) | |
494 | return ERR_PTR(-ENOMEM); | |
f8489128 | 495 | |
7d7ea89e TT |
496 | if (!bh_uptodate_or_lock(bh)) { |
497 | trace_ext4_ext_load_extent(inode, pblk, _RET_IP_); | |
498 | err = bh_submit_read(bh); | |
499 | if (err < 0) | |
500 | goto errout; | |
501 | } | |
7869a4a6 | 502 | if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE)) |
7d7ea89e TT |
503 | return bh; |
504 | err = __ext4_ext_check(function, line, inode, | |
c349179b | 505 | ext_block_hdr(bh), depth, pblk); |
7d7ea89e TT |
506 | if (err) |
507 | goto errout; | |
f8489128 | 508 | set_buffer_verified(bh); |
107a7bd3 TT |
509 | /* |
510 | * If this is a leaf block, cache all of its entries | |
511 | */ | |
512 | if (!(flags & EXT4_EX_NOCACHE) && depth == 0) { | |
513 | struct ext4_extent_header *eh = ext_block_hdr(bh); | |
514 | struct ext4_extent *ex = EXT_FIRST_EXTENT(eh); | |
515 | ext4_lblk_t prev = 0; | |
516 | int i; | |
517 | ||
518 | for (i = le16_to_cpu(eh->eh_entries); i > 0; i--, ex++) { | |
519 | unsigned int status = EXTENT_STATUS_WRITTEN; | |
520 | ext4_lblk_t lblk = le32_to_cpu(ex->ee_block); | |
521 | int len = ext4_ext_get_actual_len(ex); | |
522 | ||
523 | if (prev && (prev != lblk)) | |
524 | ext4_es_cache_extent(inode, prev, | |
525 | lblk - prev, ~0, | |
526 | EXTENT_STATUS_HOLE); | |
527 | ||
528 | if (ext4_ext_is_uninitialized(ex)) | |
529 | status = EXTENT_STATUS_UNWRITTEN; | |
530 | ext4_es_cache_extent(inode, lblk, len, | |
531 | ext4_ext_pblock(ex), status); | |
532 | prev = lblk + len; | |
533 | } | |
534 | } | |
7d7ea89e TT |
535 | return bh; |
536 | errout: | |
537 | put_bh(bh); | |
538 | return ERR_PTR(err); | |
539 | ||
f8489128 DW |
540 | } |
541 | ||
107a7bd3 TT |
542 | #define read_extent_tree_block(inode, pblk, depth, flags) \ |
543 | __read_extent_tree_block(__func__, __LINE__, (inode), (pblk), \ | |
544 | (depth), (flags)) | |
f8489128 | 545 | |
7869a4a6 TT |
546 | /* |
547 | * This function is called to cache a file's extent information in the | |
548 | * extent status tree | |
549 | */ | |
550 | int ext4_ext_precache(struct inode *inode) | |
551 | { | |
552 | struct ext4_inode_info *ei = EXT4_I(inode); | |
553 | struct ext4_ext_path *path = NULL; | |
554 | struct buffer_head *bh; | |
555 | int i = 0, depth, ret = 0; | |
556 | ||
557 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) | |
558 | return 0; /* not an extent-mapped inode */ | |
559 | ||
560 | down_read(&ei->i_data_sem); | |
561 | depth = ext_depth(inode); | |
562 | ||
563 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), | |
564 | GFP_NOFS); | |
565 | if (path == NULL) { | |
566 | up_read(&ei->i_data_sem); | |
567 | return -ENOMEM; | |
568 | } | |
569 | ||
570 | /* Don't cache anything if there are no external extent blocks */ | |
571 | if (depth == 0) | |
572 | goto out; | |
573 | path[0].p_hdr = ext_inode_hdr(inode); | |
574 | ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0); | |
575 | if (ret) | |
576 | goto out; | |
577 | path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr); | |
578 | while (i >= 0) { | |
579 | /* | |
580 | * If this is a leaf block or we've reached the end of | |
581 | * the index block, go up | |
582 | */ | |
583 | if ((i == depth) || | |
584 | path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) { | |
585 | brelse(path[i].p_bh); | |
586 | path[i].p_bh = NULL; | |
587 | i--; | |
588 | continue; | |
589 | } | |
590 | bh = read_extent_tree_block(inode, | |
591 | ext4_idx_pblock(path[i].p_idx++), | |
592 | depth - i - 1, | |
593 | EXT4_EX_FORCE_CACHE); | |
594 | if (IS_ERR(bh)) { | |
595 | ret = PTR_ERR(bh); | |
596 | break; | |
597 | } | |
598 | i++; | |
599 | path[i].p_bh = bh; | |
600 | path[i].p_hdr = ext_block_hdr(bh); | |
601 | path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr); | |
602 | } | |
603 | ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED); | |
604 | out: | |
605 | up_read(&ei->i_data_sem); | |
606 | ext4_ext_drop_refs(path); | |
607 | kfree(path); | |
608 | return ret; | |
609 | } | |
610 | ||
a86c6181 AT |
611 | #ifdef EXT_DEBUG |
612 | static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path) | |
613 | { | |
614 | int k, l = path->p_depth; | |
615 | ||
616 | ext_debug("path:"); | |
617 | for (k = 0; k <= l; k++, path++) { | |
618 | if (path->p_idx) { | |
2ae02107 | 619 | ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block), |
bf89d16f | 620 | ext4_idx_pblock(path->p_idx)); |
a86c6181 | 621 | } else if (path->p_ext) { |
553f9008 | 622 | ext_debug(" %d:[%d]%d:%llu ", |
a86c6181 | 623 | le32_to_cpu(path->p_ext->ee_block), |
553f9008 | 624 | ext4_ext_is_uninitialized(path->p_ext), |
a2df2a63 | 625 | ext4_ext_get_actual_len(path->p_ext), |
bf89d16f | 626 | ext4_ext_pblock(path->p_ext)); |
a86c6181 AT |
627 | } else |
628 | ext_debug(" []"); | |
629 | } | |
630 | ext_debug("\n"); | |
631 | } | |
632 | ||
633 | static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path) | |
634 | { | |
635 | int depth = ext_depth(inode); | |
636 | struct ext4_extent_header *eh; | |
637 | struct ext4_extent *ex; | |
638 | int i; | |
639 | ||
640 | if (!path) | |
641 | return; | |
642 | ||
643 | eh = path[depth].p_hdr; | |
644 | ex = EXT_FIRST_EXTENT(eh); | |
645 | ||
553f9008 M |
646 | ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino); |
647 | ||
a86c6181 | 648 | for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) { |
553f9008 M |
649 | ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block), |
650 | ext4_ext_is_uninitialized(ex), | |
bf89d16f | 651 | ext4_ext_get_actual_len(ex), ext4_ext_pblock(ex)); |
a86c6181 AT |
652 | } |
653 | ext_debug("\n"); | |
654 | } | |
1b16da77 YY |
655 | |
656 | static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path, | |
657 | ext4_fsblk_t newblock, int level) | |
658 | { | |
659 | int depth = ext_depth(inode); | |
660 | struct ext4_extent *ex; | |
661 | ||
662 | if (depth != level) { | |
663 | struct ext4_extent_idx *idx; | |
664 | idx = path[level].p_idx; | |
665 | while (idx <= EXT_MAX_INDEX(path[level].p_hdr)) { | |
666 | ext_debug("%d: move %d:%llu in new index %llu\n", level, | |
667 | le32_to_cpu(idx->ei_block), | |
668 | ext4_idx_pblock(idx), | |
669 | newblock); | |
670 | idx++; | |
671 | } | |
672 | ||
673 | return; | |
674 | } | |
675 | ||
676 | ex = path[depth].p_ext; | |
677 | while (ex <= EXT_MAX_EXTENT(path[depth].p_hdr)) { | |
678 | ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n", | |
679 | le32_to_cpu(ex->ee_block), | |
680 | ext4_ext_pblock(ex), | |
681 | ext4_ext_is_uninitialized(ex), | |
682 | ext4_ext_get_actual_len(ex), | |
683 | newblock); | |
684 | ex++; | |
685 | } | |
686 | } | |
687 | ||
a86c6181 | 688 | #else |
af5bc92d TT |
689 | #define ext4_ext_show_path(inode, path) |
690 | #define ext4_ext_show_leaf(inode, path) | |
1b16da77 | 691 | #define ext4_ext_show_move(inode, path, newblock, level) |
a86c6181 AT |
692 | #endif |
693 | ||
b35905c1 | 694 | void ext4_ext_drop_refs(struct ext4_ext_path *path) |
a86c6181 AT |
695 | { |
696 | int depth = path->p_depth; | |
697 | int i; | |
698 | ||
699 | for (i = 0; i <= depth; i++, path++) | |
700 | if (path->p_bh) { | |
701 | brelse(path->p_bh); | |
702 | path->p_bh = NULL; | |
703 | } | |
704 | } | |
705 | ||
706 | /* | |
d0d856e8 RD |
707 | * ext4_ext_binsearch_idx: |
708 | * binary search for the closest index of the given block | |
c29c0ae7 | 709 | * the header must be checked before calling this |
a86c6181 AT |
710 | */ |
711 | static void | |
725d26d3 AK |
712 | ext4_ext_binsearch_idx(struct inode *inode, |
713 | struct ext4_ext_path *path, ext4_lblk_t block) | |
a86c6181 AT |
714 | { |
715 | struct ext4_extent_header *eh = path->p_hdr; | |
716 | struct ext4_extent_idx *r, *l, *m; | |
717 | ||
a86c6181 | 718 | |
bba90743 | 719 | ext_debug("binsearch for %u(idx): ", block); |
a86c6181 AT |
720 | |
721 | l = EXT_FIRST_INDEX(eh) + 1; | |
e9f410b1 | 722 | r = EXT_LAST_INDEX(eh); |
a86c6181 AT |
723 | while (l <= r) { |
724 | m = l + (r - l) / 2; | |
725 | if (block < le32_to_cpu(m->ei_block)) | |
726 | r = m - 1; | |
727 | else | |
728 | l = m + 1; | |
26d535ed DM |
729 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block), |
730 | m, le32_to_cpu(m->ei_block), | |
731 | r, le32_to_cpu(r->ei_block)); | |
a86c6181 AT |
732 | } |
733 | ||
734 | path->p_idx = l - 1; | |
4a3c3a51 | 735 | ext_debug(" -> %u->%lld ", le32_to_cpu(path->p_idx->ei_block), |
bf89d16f | 736 | ext4_idx_pblock(path->p_idx)); |
a86c6181 AT |
737 | |
738 | #ifdef CHECK_BINSEARCH | |
739 | { | |
740 | struct ext4_extent_idx *chix, *ix; | |
741 | int k; | |
742 | ||
743 | chix = ix = EXT_FIRST_INDEX(eh); | |
744 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) { | |
745 | if (k != 0 && | |
746 | le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) { | |
4776004f TT |
747 | printk(KERN_DEBUG "k=%d, ix=0x%p, " |
748 | "first=0x%p\n", k, | |
749 | ix, EXT_FIRST_INDEX(eh)); | |
750 | printk(KERN_DEBUG "%u <= %u\n", | |
a86c6181 AT |
751 | le32_to_cpu(ix->ei_block), |
752 | le32_to_cpu(ix[-1].ei_block)); | |
753 | } | |
754 | BUG_ON(k && le32_to_cpu(ix->ei_block) | |
8c55e204 | 755 | <= le32_to_cpu(ix[-1].ei_block)); |
a86c6181 AT |
756 | if (block < le32_to_cpu(ix->ei_block)) |
757 | break; | |
758 | chix = ix; | |
759 | } | |
760 | BUG_ON(chix != path->p_idx); | |
761 | } | |
762 | #endif | |
763 | ||
764 | } | |
765 | ||
766 | /* | |
d0d856e8 RD |
767 | * ext4_ext_binsearch: |
768 | * binary search for closest extent of the given block | |
c29c0ae7 | 769 | * the header must be checked before calling this |
a86c6181 AT |
770 | */ |
771 | static void | |
725d26d3 AK |
772 | ext4_ext_binsearch(struct inode *inode, |
773 | struct ext4_ext_path *path, ext4_lblk_t block) | |
a86c6181 AT |
774 | { |
775 | struct ext4_extent_header *eh = path->p_hdr; | |
776 | struct ext4_extent *r, *l, *m; | |
777 | ||
a86c6181 AT |
778 | if (eh->eh_entries == 0) { |
779 | /* | |
d0d856e8 RD |
780 | * this leaf is empty: |
781 | * we get such a leaf in split/add case | |
a86c6181 AT |
782 | */ |
783 | return; | |
784 | } | |
785 | ||
bba90743 | 786 | ext_debug("binsearch for %u: ", block); |
a86c6181 AT |
787 | |
788 | l = EXT_FIRST_EXTENT(eh) + 1; | |
e9f410b1 | 789 | r = EXT_LAST_EXTENT(eh); |
a86c6181 AT |
790 | |
791 | while (l <= r) { | |
792 | m = l + (r - l) / 2; | |
793 | if (block < le32_to_cpu(m->ee_block)) | |
794 | r = m - 1; | |
795 | else | |
796 | l = m + 1; | |
26d535ed DM |
797 | ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block), |
798 | m, le32_to_cpu(m->ee_block), | |
799 | r, le32_to_cpu(r->ee_block)); | |
a86c6181 AT |
800 | } |
801 | ||
802 | path->p_ext = l - 1; | |
553f9008 | 803 | ext_debug(" -> %d:%llu:[%d]%d ", |
8c55e204 | 804 | le32_to_cpu(path->p_ext->ee_block), |
bf89d16f | 805 | ext4_ext_pblock(path->p_ext), |
553f9008 | 806 | ext4_ext_is_uninitialized(path->p_ext), |
a2df2a63 | 807 | ext4_ext_get_actual_len(path->p_ext)); |
a86c6181 AT |
808 | |
809 | #ifdef CHECK_BINSEARCH | |
810 | { | |
811 | struct ext4_extent *chex, *ex; | |
812 | int k; | |
813 | ||
814 | chex = ex = EXT_FIRST_EXTENT(eh); | |
815 | for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) { | |
816 | BUG_ON(k && le32_to_cpu(ex->ee_block) | |
8c55e204 | 817 | <= le32_to_cpu(ex[-1].ee_block)); |
a86c6181 AT |
818 | if (block < le32_to_cpu(ex->ee_block)) |
819 | break; | |
820 | chex = ex; | |
821 | } | |
822 | BUG_ON(chex != path->p_ext); | |
823 | } | |
824 | #endif | |
825 | ||
826 | } | |
827 | ||
828 | int ext4_ext_tree_init(handle_t *handle, struct inode *inode) | |
829 | { | |
830 | struct ext4_extent_header *eh; | |
831 | ||
832 | eh = ext_inode_hdr(inode); | |
833 | eh->eh_depth = 0; | |
834 | eh->eh_entries = 0; | |
835 | eh->eh_magic = EXT4_EXT_MAGIC; | |
55ad63bf | 836 | eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0)); |
a86c6181 | 837 | ext4_mark_inode_dirty(handle, inode); |
a86c6181 AT |
838 | return 0; |
839 | } | |
840 | ||
841 | struct ext4_ext_path * | |
725d26d3 | 842 | ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, |
107a7bd3 | 843 | struct ext4_ext_path *path, int flags) |
a86c6181 AT |
844 | { |
845 | struct ext4_extent_header *eh; | |
846 | struct buffer_head *bh; | |
847 | short int depth, i, ppos = 0, alloc = 0; | |
860d21e2 | 848 | int ret; |
a86c6181 AT |
849 | |
850 | eh = ext_inode_hdr(inode); | |
c29c0ae7 | 851 | depth = ext_depth(inode); |
a86c6181 AT |
852 | |
853 | /* account possible depth increase */ | |
854 | if (!path) { | |
5d4958f9 | 855 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2), |
a86c6181 AT |
856 | GFP_NOFS); |
857 | if (!path) | |
858 | return ERR_PTR(-ENOMEM); | |
859 | alloc = 1; | |
860 | } | |
a86c6181 | 861 | path[0].p_hdr = eh; |
1973adcb | 862 | path[0].p_bh = NULL; |
a86c6181 | 863 | |
c29c0ae7 | 864 | i = depth; |
a86c6181 AT |
865 | /* walk through the tree */ |
866 | while (i) { | |
867 | ext_debug("depth %d: num %d, max %d\n", | |
868 | ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); | |
c29c0ae7 | 869 | |
a86c6181 | 870 | ext4_ext_binsearch_idx(inode, path + ppos, block); |
bf89d16f | 871 | path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); |
a86c6181 AT |
872 | path[ppos].p_depth = i; |
873 | path[ppos].p_ext = NULL; | |
874 | ||
107a7bd3 TT |
875 | bh = read_extent_tree_block(inode, path[ppos].p_block, --i, |
876 | flags); | |
7d7ea89e TT |
877 | if (IS_ERR(bh)) { |
878 | ret = PTR_ERR(bh); | |
a86c6181 | 879 | goto err; |
860d21e2 | 880 | } |
7d7ea89e | 881 | |
a86c6181 AT |
882 | eh = ext_block_hdr(bh); |
883 | ppos++; | |
273df556 FM |
884 | if (unlikely(ppos > depth)) { |
885 | put_bh(bh); | |
886 | EXT4_ERROR_INODE(inode, | |
887 | "ppos %d > depth %d", ppos, depth); | |
860d21e2 | 888 | ret = -EIO; |
273df556 FM |
889 | goto err; |
890 | } | |
a86c6181 AT |
891 | path[ppos].p_bh = bh; |
892 | path[ppos].p_hdr = eh; | |
a86c6181 AT |
893 | } |
894 | ||
895 | path[ppos].p_depth = i; | |
a86c6181 AT |
896 | path[ppos].p_ext = NULL; |
897 | path[ppos].p_idx = NULL; | |
898 | ||
a86c6181 AT |
899 | /* find extent */ |
900 | ext4_ext_binsearch(inode, path + ppos, block); | |
1973adcb SF |
901 | /* if not an empty leaf */ |
902 | if (path[ppos].p_ext) | |
bf89d16f | 903 | path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); |
a86c6181 AT |
904 | |
905 | ext4_ext_show_path(inode, path); | |
906 | ||
907 | return path; | |
908 | ||
909 | err: | |
910 | ext4_ext_drop_refs(path); | |
911 | if (alloc) | |
912 | kfree(path); | |
860d21e2 | 913 | return ERR_PTR(ret); |
a86c6181 AT |
914 | } |
915 | ||
916 | /* | |
d0d856e8 RD |
917 | * ext4_ext_insert_index: |
918 | * insert new index [@logical;@ptr] into the block at @curp; | |
919 | * check where to insert: before @curp or after @curp | |
a86c6181 | 920 | */ |
1f109d5a TT |
921 | static int ext4_ext_insert_index(handle_t *handle, struct inode *inode, |
922 | struct ext4_ext_path *curp, | |
923 | int logical, ext4_fsblk_t ptr) | |
a86c6181 AT |
924 | { |
925 | struct ext4_extent_idx *ix; | |
926 | int len, err; | |
927 | ||
7e028976 AM |
928 | err = ext4_ext_get_access(handle, inode, curp); |
929 | if (err) | |
a86c6181 AT |
930 | return err; |
931 | ||
273df556 FM |
932 | if (unlikely(logical == le32_to_cpu(curp->p_idx->ei_block))) { |
933 | EXT4_ERROR_INODE(inode, | |
934 | "logical %d == ei_block %d!", | |
935 | logical, le32_to_cpu(curp->p_idx->ei_block)); | |
936 | return -EIO; | |
937 | } | |
d4620315 RD |
938 | |
939 | if (unlikely(le16_to_cpu(curp->p_hdr->eh_entries) | |
940 | >= le16_to_cpu(curp->p_hdr->eh_max))) { | |
941 | EXT4_ERROR_INODE(inode, | |
942 | "eh_entries %d >= eh_max %d!", | |
943 | le16_to_cpu(curp->p_hdr->eh_entries), | |
944 | le16_to_cpu(curp->p_hdr->eh_max)); | |
945 | return -EIO; | |
946 | } | |
947 | ||
a86c6181 AT |
948 | if (logical > le32_to_cpu(curp->p_idx->ei_block)) { |
949 | /* insert after */ | |
80e675f9 | 950 | ext_debug("insert new index %d after: %llu\n", logical, ptr); |
a86c6181 AT |
951 | ix = curp->p_idx + 1; |
952 | } else { | |
953 | /* insert before */ | |
80e675f9 | 954 | ext_debug("insert new index %d before: %llu\n", logical, ptr); |
a86c6181 AT |
955 | ix = curp->p_idx; |
956 | } | |
957 | ||
80e675f9 EG |
958 | len = EXT_LAST_INDEX(curp->p_hdr) - ix + 1; |
959 | BUG_ON(len < 0); | |
960 | if (len > 0) { | |
961 | ext_debug("insert new index %d: " | |
962 | "move %d indices from 0x%p to 0x%p\n", | |
963 | logical, len, ix, ix + 1); | |
964 | memmove(ix + 1, ix, len * sizeof(struct ext4_extent_idx)); | |
965 | } | |
966 | ||
f472e026 TM |
967 | if (unlikely(ix > EXT_MAX_INDEX(curp->p_hdr))) { |
968 | EXT4_ERROR_INODE(inode, "ix > EXT_MAX_INDEX!"); | |
969 | return -EIO; | |
970 | } | |
971 | ||
a86c6181 | 972 | ix->ei_block = cpu_to_le32(logical); |
f65e6fba | 973 | ext4_idx_store_pblock(ix, ptr); |
e8546d06 | 974 | le16_add_cpu(&curp->p_hdr->eh_entries, 1); |
a86c6181 | 975 | |
273df556 FM |
976 | if (unlikely(ix > EXT_LAST_INDEX(curp->p_hdr))) { |
977 | EXT4_ERROR_INODE(inode, "ix > EXT_LAST_INDEX!"); | |
978 | return -EIO; | |
979 | } | |
a86c6181 AT |
980 | |
981 | err = ext4_ext_dirty(handle, inode, curp); | |
982 | ext4_std_error(inode->i_sb, err); | |
983 | ||
984 | return err; | |
985 | } | |
986 | ||
987 | /* | |
d0d856e8 RD |
988 | * ext4_ext_split: |
989 | * inserts new subtree into the path, using free index entry | |
990 | * at depth @at: | |
991 | * - allocates all needed blocks (new leaf and all intermediate index blocks) | |
992 | * - makes decision where to split | |
993 | * - moves remaining extents and index entries (right to the split point) | |
994 | * into the newly allocated blocks | |
995 | * - initializes subtree | |
a86c6181 AT |
996 | */ |
997 | static int ext4_ext_split(handle_t *handle, struct inode *inode, | |
55f020db AH |
998 | unsigned int flags, |
999 | struct ext4_ext_path *path, | |
1000 | struct ext4_extent *newext, int at) | |
a86c6181 AT |
1001 | { |
1002 | struct buffer_head *bh = NULL; | |
1003 | int depth = ext_depth(inode); | |
1004 | struct ext4_extent_header *neh; | |
1005 | struct ext4_extent_idx *fidx; | |
a86c6181 | 1006 | int i = at, k, m, a; |
f65e6fba | 1007 | ext4_fsblk_t newblock, oldblock; |
a86c6181 | 1008 | __le32 border; |
f65e6fba | 1009 | ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */ |
a86c6181 AT |
1010 | int err = 0; |
1011 | ||
1012 | /* make decision: where to split? */ | |
d0d856e8 | 1013 | /* FIXME: now decision is simplest: at current extent */ |
a86c6181 | 1014 | |
d0d856e8 | 1015 | /* if current leaf will be split, then we should use |
a86c6181 | 1016 | * border from split point */ |
273df556 FM |
1017 | if (unlikely(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr))) { |
1018 | EXT4_ERROR_INODE(inode, "p_ext > EXT_MAX_EXTENT!"); | |
1019 | return -EIO; | |
1020 | } | |
a86c6181 AT |
1021 | if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) { |
1022 | border = path[depth].p_ext[1].ee_block; | |
d0d856e8 | 1023 | ext_debug("leaf will be split." |
a86c6181 | 1024 | " next leaf starts at %d\n", |
8c55e204 | 1025 | le32_to_cpu(border)); |
a86c6181 AT |
1026 | } else { |
1027 | border = newext->ee_block; | |
1028 | ext_debug("leaf will be added." | |
1029 | " next leaf starts at %d\n", | |
8c55e204 | 1030 | le32_to_cpu(border)); |
a86c6181 AT |
1031 | } |
1032 | ||
1033 | /* | |
d0d856e8 RD |
1034 | * If error occurs, then we break processing |
1035 | * and mark filesystem read-only. index won't | |
a86c6181 | 1036 | * be inserted and tree will be in consistent |
d0d856e8 | 1037 | * state. Next mount will repair buffers too. |
a86c6181 AT |
1038 | */ |
1039 | ||
1040 | /* | |
d0d856e8 RD |
1041 | * Get array to track all allocated blocks. |
1042 | * We need this to handle errors and free blocks | |
1043 | * upon them. | |
a86c6181 | 1044 | */ |
5d4958f9 | 1045 | ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS); |
a86c6181 AT |
1046 | if (!ablocks) |
1047 | return -ENOMEM; | |
a86c6181 AT |
1048 | |
1049 | /* allocate all needed blocks */ | |
1050 | ext_debug("allocate %d blocks for indexes/leaf\n", depth - at); | |
1051 | for (a = 0; a < depth - at; a++) { | |
654b4908 | 1052 | newblock = ext4_ext_new_meta_block(handle, inode, path, |
55f020db | 1053 | newext, &err, flags); |
a86c6181 AT |
1054 | if (newblock == 0) |
1055 | goto cleanup; | |
1056 | ablocks[a] = newblock; | |
1057 | } | |
1058 | ||
1059 | /* initialize new leaf */ | |
1060 | newblock = ablocks[--a]; | |
273df556 FM |
1061 | if (unlikely(newblock == 0)) { |
1062 | EXT4_ERROR_INODE(inode, "newblock == 0!"); | |
1063 | err = -EIO; | |
1064 | goto cleanup; | |
1065 | } | |
a86c6181 | 1066 | bh = sb_getblk(inode->i_sb, newblock); |
aebf0243 | 1067 | if (unlikely(!bh)) { |
860d21e2 | 1068 | err = -ENOMEM; |
a86c6181 AT |
1069 | goto cleanup; |
1070 | } | |
1071 | lock_buffer(bh); | |
1072 | ||
7e028976 AM |
1073 | err = ext4_journal_get_create_access(handle, bh); |
1074 | if (err) | |
a86c6181 AT |
1075 | goto cleanup; |
1076 | ||
1077 | neh = ext_block_hdr(bh); | |
1078 | neh->eh_entries = 0; | |
55ad63bf | 1079 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
a86c6181 AT |
1080 | neh->eh_magic = EXT4_EXT_MAGIC; |
1081 | neh->eh_depth = 0; | |
a86c6181 | 1082 | |
d0d856e8 | 1083 | /* move remainder of path[depth] to the new leaf */ |
273df556 FM |
1084 | if (unlikely(path[depth].p_hdr->eh_entries != |
1085 | path[depth].p_hdr->eh_max)) { | |
1086 | EXT4_ERROR_INODE(inode, "eh_entries %d != eh_max %d!", | |
1087 | path[depth].p_hdr->eh_entries, | |
1088 | path[depth].p_hdr->eh_max); | |
1089 | err = -EIO; | |
1090 | goto cleanup; | |
1091 | } | |
a86c6181 | 1092 | /* start copy from next extent */ |
1b16da77 YY |
1093 | m = EXT_MAX_EXTENT(path[depth].p_hdr) - path[depth].p_ext++; |
1094 | ext4_ext_show_move(inode, path, newblock, depth); | |
a86c6181 | 1095 | if (m) { |
1b16da77 YY |
1096 | struct ext4_extent *ex; |
1097 | ex = EXT_FIRST_EXTENT(neh); | |
1098 | memmove(ex, path[depth].p_ext, sizeof(struct ext4_extent) * m); | |
e8546d06 | 1099 | le16_add_cpu(&neh->eh_entries, m); |
a86c6181 AT |
1100 | } |
1101 | ||
7ac5990d | 1102 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
1103 | set_buffer_uptodate(bh); |
1104 | unlock_buffer(bh); | |
1105 | ||
0390131b | 1106 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 1107 | if (err) |
a86c6181 AT |
1108 | goto cleanup; |
1109 | brelse(bh); | |
1110 | bh = NULL; | |
1111 | ||
1112 | /* correct old leaf */ | |
1113 | if (m) { | |
7e028976 AM |
1114 | err = ext4_ext_get_access(handle, inode, path + depth); |
1115 | if (err) | |
a86c6181 | 1116 | goto cleanup; |
e8546d06 | 1117 | le16_add_cpu(&path[depth].p_hdr->eh_entries, -m); |
7e028976 AM |
1118 | err = ext4_ext_dirty(handle, inode, path + depth); |
1119 | if (err) | |
a86c6181 AT |
1120 | goto cleanup; |
1121 | ||
1122 | } | |
1123 | ||
1124 | /* create intermediate indexes */ | |
1125 | k = depth - at - 1; | |
273df556 FM |
1126 | if (unlikely(k < 0)) { |
1127 | EXT4_ERROR_INODE(inode, "k %d < 0!", k); | |
1128 | err = -EIO; | |
1129 | goto cleanup; | |
1130 | } | |
a86c6181 AT |
1131 | if (k) |
1132 | ext_debug("create %d intermediate indices\n", k); | |
1133 | /* insert new index into current index block */ | |
1134 | /* current depth stored in i var */ | |
1135 | i = depth - 1; | |
1136 | while (k--) { | |
1137 | oldblock = newblock; | |
1138 | newblock = ablocks[--a]; | |
bba90743 | 1139 | bh = sb_getblk(inode->i_sb, newblock); |
aebf0243 | 1140 | if (unlikely(!bh)) { |
860d21e2 | 1141 | err = -ENOMEM; |
a86c6181 AT |
1142 | goto cleanup; |
1143 | } | |
1144 | lock_buffer(bh); | |
1145 | ||
7e028976 AM |
1146 | err = ext4_journal_get_create_access(handle, bh); |
1147 | if (err) | |
a86c6181 AT |
1148 | goto cleanup; |
1149 | ||
1150 | neh = ext_block_hdr(bh); | |
1151 | neh->eh_entries = cpu_to_le16(1); | |
1152 | neh->eh_magic = EXT4_EXT_MAGIC; | |
55ad63bf | 1153 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
a86c6181 AT |
1154 | neh->eh_depth = cpu_to_le16(depth - i); |
1155 | fidx = EXT_FIRST_INDEX(neh); | |
1156 | fidx->ei_block = border; | |
f65e6fba | 1157 | ext4_idx_store_pblock(fidx, oldblock); |
a86c6181 | 1158 | |
bba90743 ES |
1159 | ext_debug("int.index at %d (block %llu): %u -> %llu\n", |
1160 | i, newblock, le32_to_cpu(border), oldblock); | |
a86c6181 | 1161 | |
1b16da77 | 1162 | /* move remainder of path[i] to the new index block */ |
273df556 FM |
1163 | if (unlikely(EXT_MAX_INDEX(path[i].p_hdr) != |
1164 | EXT_LAST_INDEX(path[i].p_hdr))) { | |
1165 | EXT4_ERROR_INODE(inode, | |
1166 | "EXT_MAX_INDEX != EXT_LAST_INDEX ee_block %d!", | |
1167 | le32_to_cpu(path[i].p_ext->ee_block)); | |
1168 | err = -EIO; | |
1169 | goto cleanup; | |
1170 | } | |
1b16da77 YY |
1171 | /* start copy indexes */ |
1172 | m = EXT_MAX_INDEX(path[i].p_hdr) - path[i].p_idx++; | |
1173 | ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx, | |
1174 | EXT_MAX_INDEX(path[i].p_hdr)); | |
1175 | ext4_ext_show_move(inode, path, newblock, i); | |
a86c6181 | 1176 | if (m) { |
1b16da77 | 1177 | memmove(++fidx, path[i].p_idx, |
a86c6181 | 1178 | sizeof(struct ext4_extent_idx) * m); |
e8546d06 | 1179 | le16_add_cpu(&neh->eh_entries, m); |
a86c6181 | 1180 | } |
7ac5990d | 1181 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
1182 | set_buffer_uptodate(bh); |
1183 | unlock_buffer(bh); | |
1184 | ||
0390131b | 1185 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 1186 | if (err) |
a86c6181 AT |
1187 | goto cleanup; |
1188 | brelse(bh); | |
1189 | bh = NULL; | |
1190 | ||
1191 | /* correct old index */ | |
1192 | if (m) { | |
1193 | err = ext4_ext_get_access(handle, inode, path + i); | |
1194 | if (err) | |
1195 | goto cleanup; | |
e8546d06 | 1196 | le16_add_cpu(&path[i].p_hdr->eh_entries, -m); |
a86c6181 AT |
1197 | err = ext4_ext_dirty(handle, inode, path + i); |
1198 | if (err) | |
1199 | goto cleanup; | |
1200 | } | |
1201 | ||
1202 | i--; | |
1203 | } | |
1204 | ||
1205 | /* insert new index */ | |
a86c6181 AT |
1206 | err = ext4_ext_insert_index(handle, inode, path + at, |
1207 | le32_to_cpu(border), newblock); | |
1208 | ||
1209 | cleanup: | |
1210 | if (bh) { | |
1211 | if (buffer_locked(bh)) | |
1212 | unlock_buffer(bh); | |
1213 | brelse(bh); | |
1214 | } | |
1215 | ||
1216 | if (err) { | |
1217 | /* free all allocated blocks in error case */ | |
1218 | for (i = 0; i < depth; i++) { | |
1219 | if (!ablocks[i]) | |
1220 | continue; | |
7dc57615 | 1221 | ext4_free_blocks(handle, inode, NULL, ablocks[i], 1, |
e6362609 | 1222 | EXT4_FREE_BLOCKS_METADATA); |
a86c6181 AT |
1223 | } |
1224 | } | |
1225 | kfree(ablocks); | |
1226 | ||
1227 | return err; | |
1228 | } | |
1229 | ||
1230 | /* | |
d0d856e8 RD |
1231 | * ext4_ext_grow_indepth: |
1232 | * implements tree growing procedure: | |
1233 | * - allocates new block | |
1234 | * - moves top-level data (index block or leaf) into the new block | |
1235 | * - initializes new top-level, creating index that points to the | |
1236 | * just created block | |
a86c6181 AT |
1237 | */ |
1238 | static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode, | |
55f020db | 1239 | unsigned int flags, |
55f020db | 1240 | struct ext4_extent *newext) |
a86c6181 | 1241 | { |
a86c6181 | 1242 | struct ext4_extent_header *neh; |
a86c6181 | 1243 | struct buffer_head *bh; |
f65e6fba | 1244 | ext4_fsblk_t newblock; |
a86c6181 AT |
1245 | int err = 0; |
1246 | ||
1939dd84 | 1247 | newblock = ext4_ext_new_meta_block(handle, inode, NULL, |
55f020db | 1248 | newext, &err, flags); |
a86c6181 AT |
1249 | if (newblock == 0) |
1250 | return err; | |
1251 | ||
1252 | bh = sb_getblk(inode->i_sb, newblock); | |
aebf0243 | 1253 | if (unlikely(!bh)) |
860d21e2 | 1254 | return -ENOMEM; |
a86c6181 AT |
1255 | lock_buffer(bh); |
1256 | ||
7e028976 AM |
1257 | err = ext4_journal_get_create_access(handle, bh); |
1258 | if (err) { | |
a86c6181 AT |
1259 | unlock_buffer(bh); |
1260 | goto out; | |
1261 | } | |
1262 | ||
1263 | /* move top-level index/leaf into new block */ | |
1939dd84 DM |
1264 | memmove(bh->b_data, EXT4_I(inode)->i_data, |
1265 | sizeof(EXT4_I(inode)->i_data)); | |
a86c6181 AT |
1266 | |
1267 | /* set size of new block */ | |
1268 | neh = ext_block_hdr(bh); | |
1269 | /* old root could have indexes or leaves | |
1270 | * so calculate e_max right way */ | |
1271 | if (ext_depth(inode)) | |
55ad63bf | 1272 | neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0)); |
a86c6181 | 1273 | else |
55ad63bf | 1274 | neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0)); |
a86c6181 | 1275 | neh->eh_magic = EXT4_EXT_MAGIC; |
7ac5990d | 1276 | ext4_extent_block_csum_set(inode, neh); |
a86c6181 AT |
1277 | set_buffer_uptodate(bh); |
1278 | unlock_buffer(bh); | |
1279 | ||
0390131b | 1280 | err = ext4_handle_dirty_metadata(handle, inode, bh); |
7e028976 | 1281 | if (err) |
a86c6181 AT |
1282 | goto out; |
1283 | ||
1939dd84 | 1284 | /* Update top-level index: num,max,pointer */ |
a86c6181 | 1285 | neh = ext_inode_hdr(inode); |
1939dd84 DM |
1286 | neh->eh_entries = cpu_to_le16(1); |
1287 | ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock); | |
1288 | if (neh->eh_depth == 0) { | |
1289 | /* Root extent block becomes index block */ | |
1290 | neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0)); | |
1291 | EXT_FIRST_INDEX(neh)->ei_block = | |
1292 | EXT_FIRST_EXTENT(neh)->ee_block; | |
1293 | } | |
2ae02107 | 1294 | ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n", |
a86c6181 | 1295 | le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max), |
5a0790c2 | 1296 | le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block), |
bf89d16f | 1297 | ext4_idx_pblock(EXT_FIRST_INDEX(neh))); |
a86c6181 | 1298 | |
ba39ebb6 | 1299 | le16_add_cpu(&neh->eh_depth, 1); |
1939dd84 | 1300 | ext4_mark_inode_dirty(handle, inode); |
a86c6181 AT |
1301 | out: |
1302 | brelse(bh); | |
1303 | ||
1304 | return err; | |
1305 | } | |
1306 | ||
1307 | /* | |
d0d856e8 RD |
1308 | * ext4_ext_create_new_leaf: |
1309 | * finds empty index and adds new leaf. | |
1310 | * if no free index is found, then it requests in-depth growing. | |
a86c6181 AT |
1311 | */ |
1312 | static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode, | |
107a7bd3 TT |
1313 | unsigned int mb_flags, |
1314 | unsigned int gb_flags, | |
55f020db AH |
1315 | struct ext4_ext_path *path, |
1316 | struct ext4_extent *newext) | |
a86c6181 AT |
1317 | { |
1318 | struct ext4_ext_path *curp; | |
1319 | int depth, i, err = 0; | |
1320 | ||
1321 | repeat: | |
1322 | i = depth = ext_depth(inode); | |
1323 | ||
1324 | /* walk up to the tree and look for free index entry */ | |
1325 | curp = path + depth; | |
1326 | while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) { | |
1327 | i--; | |
1328 | curp--; | |
1329 | } | |
1330 | ||
d0d856e8 RD |
1331 | /* we use already allocated block for index block, |
1332 | * so subsequent data blocks should be contiguous */ | |
a86c6181 AT |
1333 | if (EXT_HAS_FREE_INDEX(curp)) { |
1334 | /* if we found index with free entry, then use that | |
1335 | * entry: create all needed subtree and add new leaf */ | |
107a7bd3 | 1336 | err = ext4_ext_split(handle, inode, mb_flags, path, newext, i); |
787e0981 SF |
1337 | if (err) |
1338 | goto out; | |
a86c6181 AT |
1339 | |
1340 | /* refill path */ | |
1341 | ext4_ext_drop_refs(path); | |
1342 | path = ext4_ext_find_extent(inode, | |
725d26d3 | 1343 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
107a7bd3 | 1344 | path, gb_flags); |
a86c6181 AT |
1345 | if (IS_ERR(path)) |
1346 | err = PTR_ERR(path); | |
1347 | } else { | |
1348 | /* tree is full, time to grow in depth */ | |
107a7bd3 | 1349 | err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext); |
a86c6181 AT |
1350 | if (err) |
1351 | goto out; | |
1352 | ||
1353 | /* refill path */ | |
1354 | ext4_ext_drop_refs(path); | |
1355 | path = ext4_ext_find_extent(inode, | |
725d26d3 | 1356 | (ext4_lblk_t)le32_to_cpu(newext->ee_block), |
107a7bd3 | 1357 | path, gb_flags); |
a86c6181 AT |
1358 | if (IS_ERR(path)) { |
1359 | err = PTR_ERR(path); | |
1360 | goto out; | |
1361 | } | |
1362 | ||
1363 | /* | |
d0d856e8 RD |
1364 | * only first (depth 0 -> 1) produces free space; |
1365 | * in all other cases we have to split the grown tree | |
a86c6181 AT |
1366 | */ |
1367 | depth = ext_depth(inode); | |
1368 | if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) { | |
d0d856e8 | 1369 | /* now we need to split */ |
a86c6181 AT |
1370 | goto repeat; |
1371 | } | |
1372 | } | |
1373 | ||
1374 | out: | |
1375 | return err; | |
1376 | } | |
1377 | ||
1988b51e AT |
1378 | /* |
1379 | * search the closest allocated block to the left for *logical | |
1380 | * and returns it at @logical + it's physical address at @phys | |
1381 | * if *logical is the smallest allocated block, the function | |
1382 | * returns 0 at @phys | |
1383 | * return value contains 0 (success) or error code | |
1384 | */ | |
1f109d5a TT |
1385 | static int ext4_ext_search_left(struct inode *inode, |
1386 | struct ext4_ext_path *path, | |
1387 | ext4_lblk_t *logical, ext4_fsblk_t *phys) | |
1988b51e AT |
1388 | { |
1389 | struct ext4_extent_idx *ix; | |
1390 | struct ext4_extent *ex; | |
b939e376 | 1391 | int depth, ee_len; |
1988b51e | 1392 | |
273df556 FM |
1393 | if (unlikely(path == NULL)) { |
1394 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); | |
1395 | return -EIO; | |
1396 | } | |
1988b51e AT |
1397 | depth = path->p_depth; |
1398 | *phys = 0; | |
1399 | ||
1400 | if (depth == 0 && path->p_ext == NULL) | |
1401 | return 0; | |
1402 | ||
1403 | /* usually extent in the path covers blocks smaller | |
1404 | * then *logical, but it can be that extent is the | |
1405 | * first one in the file */ | |
1406 | ||
1407 | ex = path[depth].p_ext; | |
b939e376 | 1408 | ee_len = ext4_ext_get_actual_len(ex); |
1988b51e | 1409 | if (*logical < le32_to_cpu(ex->ee_block)) { |
273df556 FM |
1410 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
1411 | EXT4_ERROR_INODE(inode, | |
1412 | "EXT_FIRST_EXTENT != ex *logical %d ee_block %d!", | |
1413 | *logical, le32_to_cpu(ex->ee_block)); | |
1414 | return -EIO; | |
1415 | } | |
1988b51e AT |
1416 | while (--depth >= 0) { |
1417 | ix = path[depth].p_idx; | |
273df556 FM |
1418 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
1419 | EXT4_ERROR_INODE(inode, | |
1420 | "ix (%d) != EXT_FIRST_INDEX (%d) (depth %d)!", | |
6ee3b212 | 1421 | ix != NULL ? le32_to_cpu(ix->ei_block) : 0, |
273df556 | 1422 | EXT_FIRST_INDEX(path[depth].p_hdr) != NULL ? |
6ee3b212 | 1423 | le32_to_cpu(EXT_FIRST_INDEX(path[depth].p_hdr)->ei_block) : 0, |
273df556 FM |
1424 | depth); |
1425 | return -EIO; | |
1426 | } | |
1988b51e AT |
1427 | } |
1428 | return 0; | |
1429 | } | |
1430 | ||
273df556 FM |
1431 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
1432 | EXT4_ERROR_INODE(inode, | |
1433 | "logical %d < ee_block %d + ee_len %d!", | |
1434 | *logical, le32_to_cpu(ex->ee_block), ee_len); | |
1435 | return -EIO; | |
1436 | } | |
1988b51e | 1437 | |
b939e376 | 1438 | *logical = le32_to_cpu(ex->ee_block) + ee_len - 1; |
bf89d16f | 1439 | *phys = ext4_ext_pblock(ex) + ee_len - 1; |
1988b51e AT |
1440 | return 0; |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * search the closest allocated block to the right for *logical | |
1445 | * and returns it at @logical + it's physical address at @phys | |
df3ab170 | 1446 | * if *logical is the largest allocated block, the function |
1988b51e AT |
1447 | * returns 0 at @phys |
1448 | * return value contains 0 (success) or error code | |
1449 | */ | |
1f109d5a TT |
1450 | static int ext4_ext_search_right(struct inode *inode, |
1451 | struct ext4_ext_path *path, | |
4d33b1ef TT |
1452 | ext4_lblk_t *logical, ext4_fsblk_t *phys, |
1453 | struct ext4_extent **ret_ex) | |
1988b51e AT |
1454 | { |
1455 | struct buffer_head *bh = NULL; | |
1456 | struct ext4_extent_header *eh; | |
1457 | struct ext4_extent_idx *ix; | |
1458 | struct ext4_extent *ex; | |
1459 | ext4_fsblk_t block; | |
395a87bf ES |
1460 | int depth; /* Note, NOT eh_depth; depth from top of tree */ |
1461 | int ee_len; | |
1988b51e | 1462 | |
273df556 FM |
1463 | if (unlikely(path == NULL)) { |
1464 | EXT4_ERROR_INODE(inode, "path == NULL *logical %d!", *logical); | |
1465 | return -EIO; | |
1466 | } | |
1988b51e AT |
1467 | depth = path->p_depth; |
1468 | *phys = 0; | |
1469 | ||
1470 | if (depth == 0 && path->p_ext == NULL) | |
1471 | return 0; | |
1472 | ||
1473 | /* usually extent in the path covers blocks smaller | |
1474 | * then *logical, but it can be that extent is the | |
1475 | * first one in the file */ | |
1476 | ||
1477 | ex = path[depth].p_ext; | |
b939e376 | 1478 | ee_len = ext4_ext_get_actual_len(ex); |
1988b51e | 1479 | if (*logical < le32_to_cpu(ex->ee_block)) { |
273df556 FM |
1480 | if (unlikely(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex)) { |
1481 | EXT4_ERROR_INODE(inode, | |
1482 | "first_extent(path[%d].p_hdr) != ex", | |
1483 | depth); | |
1484 | return -EIO; | |
1485 | } | |
1988b51e AT |
1486 | while (--depth >= 0) { |
1487 | ix = path[depth].p_idx; | |
273df556 FM |
1488 | if (unlikely(ix != EXT_FIRST_INDEX(path[depth].p_hdr))) { |
1489 | EXT4_ERROR_INODE(inode, | |
1490 | "ix != EXT_FIRST_INDEX *logical %d!", | |
1491 | *logical); | |
1492 | return -EIO; | |
1493 | } | |
1988b51e | 1494 | } |
4d33b1ef | 1495 | goto found_extent; |
1988b51e AT |
1496 | } |
1497 | ||
273df556 FM |
1498 | if (unlikely(*logical < (le32_to_cpu(ex->ee_block) + ee_len))) { |
1499 | EXT4_ERROR_INODE(inode, | |
1500 | "logical %d < ee_block %d + ee_len %d!", | |
1501 | *logical, le32_to_cpu(ex->ee_block), ee_len); | |
1502 | return -EIO; | |
1503 | } | |
1988b51e AT |
1504 | |
1505 | if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) { | |
1506 | /* next allocated block in this leaf */ | |
1507 | ex++; | |
4d33b1ef | 1508 | goto found_extent; |
1988b51e AT |
1509 | } |
1510 | ||
1511 | /* go up and search for index to the right */ | |
1512 | while (--depth >= 0) { | |
1513 | ix = path[depth].p_idx; | |
1514 | if (ix != EXT_LAST_INDEX(path[depth].p_hdr)) | |
25f1ee3a | 1515 | goto got_index; |
1988b51e AT |
1516 | } |
1517 | ||
25f1ee3a WF |
1518 | /* we've gone up to the root and found no index to the right */ |
1519 | return 0; | |
1988b51e | 1520 | |
25f1ee3a | 1521 | got_index: |
1988b51e AT |
1522 | /* we've found index to the right, let's |
1523 | * follow it and find the closest allocated | |
1524 | * block to the right */ | |
1525 | ix++; | |
bf89d16f | 1526 | block = ext4_idx_pblock(ix); |
1988b51e | 1527 | while (++depth < path->p_depth) { |
395a87bf | 1528 | /* subtract from p_depth to get proper eh_depth */ |
7d7ea89e | 1529 | bh = read_extent_tree_block(inode, block, |
107a7bd3 | 1530 | path->p_depth - depth, 0); |
7d7ea89e TT |
1531 | if (IS_ERR(bh)) |
1532 | return PTR_ERR(bh); | |
1533 | eh = ext_block_hdr(bh); | |
1988b51e | 1534 | ix = EXT_FIRST_INDEX(eh); |
bf89d16f | 1535 | block = ext4_idx_pblock(ix); |
1988b51e AT |
1536 | put_bh(bh); |
1537 | } | |
1538 | ||
107a7bd3 | 1539 | bh = read_extent_tree_block(inode, block, path->p_depth - depth, 0); |
7d7ea89e TT |
1540 | if (IS_ERR(bh)) |
1541 | return PTR_ERR(bh); | |
1988b51e | 1542 | eh = ext_block_hdr(bh); |
1988b51e | 1543 | ex = EXT_FIRST_EXTENT(eh); |
4d33b1ef | 1544 | found_extent: |
1988b51e | 1545 | *logical = le32_to_cpu(ex->ee_block); |
bf89d16f | 1546 | *phys = ext4_ext_pblock(ex); |
4d33b1ef TT |
1547 | *ret_ex = ex; |
1548 | if (bh) | |
1549 | put_bh(bh); | |
1988b51e | 1550 | return 0; |
1988b51e AT |
1551 | } |
1552 | ||
a86c6181 | 1553 | /* |
d0d856e8 | 1554 | * ext4_ext_next_allocated_block: |
f17722f9 | 1555 | * returns allocated block in subsequent extent or EXT_MAX_BLOCKS. |
d0d856e8 RD |
1556 | * NOTE: it considers block number from index entry as |
1557 | * allocated block. Thus, index entries have to be consistent | |
1558 | * with leaves. | |
a86c6181 | 1559 | */ |
725d26d3 | 1560 | static ext4_lblk_t |
a86c6181 AT |
1561 | ext4_ext_next_allocated_block(struct ext4_ext_path *path) |
1562 | { | |
1563 | int depth; | |
1564 | ||
1565 | BUG_ON(path == NULL); | |
1566 | depth = path->p_depth; | |
1567 | ||
1568 | if (depth == 0 && path->p_ext == NULL) | |
f17722f9 | 1569 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1570 | |
1571 | while (depth >= 0) { | |
1572 | if (depth == path->p_depth) { | |
1573 | /* leaf */ | |
6f8ff537 CW |
1574 | if (path[depth].p_ext && |
1575 | path[depth].p_ext != | |
a86c6181 AT |
1576 | EXT_LAST_EXTENT(path[depth].p_hdr)) |
1577 | return le32_to_cpu(path[depth].p_ext[1].ee_block); | |
1578 | } else { | |
1579 | /* index */ | |
1580 | if (path[depth].p_idx != | |
1581 | EXT_LAST_INDEX(path[depth].p_hdr)) | |
1582 | return le32_to_cpu(path[depth].p_idx[1].ei_block); | |
1583 | } | |
1584 | depth--; | |
1585 | } | |
1586 | ||
f17722f9 | 1587 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1588 | } |
1589 | ||
1590 | /* | |
d0d856e8 | 1591 | * ext4_ext_next_leaf_block: |
f17722f9 | 1592 | * returns first allocated block from next leaf or EXT_MAX_BLOCKS |
a86c6181 | 1593 | */ |
5718789d | 1594 | static ext4_lblk_t ext4_ext_next_leaf_block(struct ext4_ext_path *path) |
a86c6181 AT |
1595 | { |
1596 | int depth; | |
1597 | ||
1598 | BUG_ON(path == NULL); | |
1599 | depth = path->p_depth; | |
1600 | ||
1601 | /* zero-tree has no leaf blocks at all */ | |
1602 | if (depth == 0) | |
f17722f9 | 1603 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1604 | |
1605 | /* go to index block */ | |
1606 | depth--; | |
1607 | ||
1608 | while (depth >= 0) { | |
1609 | if (path[depth].p_idx != | |
1610 | EXT_LAST_INDEX(path[depth].p_hdr)) | |
725d26d3 AK |
1611 | return (ext4_lblk_t) |
1612 | le32_to_cpu(path[depth].p_idx[1].ei_block); | |
a86c6181 AT |
1613 | depth--; |
1614 | } | |
1615 | ||
f17722f9 | 1616 | return EXT_MAX_BLOCKS; |
a86c6181 AT |
1617 | } |
1618 | ||
1619 | /* | |
d0d856e8 RD |
1620 | * ext4_ext_correct_indexes: |
1621 | * if leaf gets modified and modified extent is first in the leaf, | |
1622 | * then we have to correct all indexes above. | |
a86c6181 AT |
1623 | * TODO: do we need to correct tree in all cases? |
1624 | */ | |
1d03ec98 | 1625 | static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode, |
a86c6181 AT |
1626 | struct ext4_ext_path *path) |
1627 | { | |
1628 | struct ext4_extent_header *eh; | |
1629 | int depth = ext_depth(inode); | |
1630 | struct ext4_extent *ex; | |
1631 | __le32 border; | |
1632 | int k, err = 0; | |
1633 | ||
1634 | eh = path[depth].p_hdr; | |
1635 | ex = path[depth].p_ext; | |
273df556 FM |
1636 | |
1637 | if (unlikely(ex == NULL || eh == NULL)) { | |
1638 | EXT4_ERROR_INODE(inode, | |
1639 | "ex %p == NULL or eh %p == NULL", ex, eh); | |
1640 | return -EIO; | |
1641 | } | |
a86c6181 AT |
1642 | |
1643 | if (depth == 0) { | |
1644 | /* there is no tree at all */ | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | if (ex != EXT_FIRST_EXTENT(eh)) { | |
1649 | /* we correct tree if first leaf got modified only */ | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | /* | |
d0d856e8 | 1654 | * TODO: we need correction if border is smaller than current one |
a86c6181 AT |
1655 | */ |
1656 | k = depth - 1; | |
1657 | border = path[depth].p_ext->ee_block; | |
7e028976 AM |
1658 | err = ext4_ext_get_access(handle, inode, path + k); |
1659 | if (err) | |
a86c6181 AT |
1660 | return err; |
1661 | path[k].p_idx->ei_block = border; | |
7e028976 AM |
1662 | err = ext4_ext_dirty(handle, inode, path + k); |
1663 | if (err) | |
a86c6181 AT |
1664 | return err; |
1665 | ||
1666 | while (k--) { | |
1667 | /* change all left-side indexes */ | |
1668 | if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr)) | |
1669 | break; | |
7e028976 AM |
1670 | err = ext4_ext_get_access(handle, inode, path + k); |
1671 | if (err) | |
a86c6181 AT |
1672 | break; |
1673 | path[k].p_idx->ei_block = border; | |
7e028976 AM |
1674 | err = ext4_ext_dirty(handle, inode, path + k); |
1675 | if (err) | |
a86c6181 AT |
1676 | break; |
1677 | } | |
1678 | ||
1679 | return err; | |
1680 | } | |
1681 | ||
748de673 | 1682 | int |
a86c6181 AT |
1683 | ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1, |
1684 | struct ext4_extent *ex2) | |
1685 | { | |
da0169b3 | 1686 | unsigned short ext1_ee_len, ext2_ee_len; |
a2df2a63 AA |
1687 | |
1688 | /* | |
ec22ba8e DM |
1689 | * Make sure that both extents are initialized. We don't merge |
1690 | * uninitialized extents so that we can be sure that end_io code has | |
1691 | * the extent that was written properly split out and conversion to | |
1692 | * initialized is trivial. | |
a2df2a63 | 1693 | */ |
ec22ba8e | 1694 | if (ext4_ext_is_uninitialized(ex1) || ext4_ext_is_uninitialized(ex2)) |
a2df2a63 AA |
1695 | return 0; |
1696 | ||
1697 | ext1_ee_len = ext4_ext_get_actual_len(ex1); | |
1698 | ext2_ee_len = ext4_ext_get_actual_len(ex2); | |
1699 | ||
1700 | if (le32_to_cpu(ex1->ee_block) + ext1_ee_len != | |
63f57933 | 1701 | le32_to_cpu(ex2->ee_block)) |
a86c6181 AT |
1702 | return 0; |
1703 | ||
471d4011 SB |
1704 | /* |
1705 | * To allow future support for preallocated extents to be added | |
1706 | * as an RO_COMPAT feature, refuse to merge to extents if | |
d0d856e8 | 1707 | * this can result in the top bit of ee_len being set. |
471d4011 | 1708 | */ |
da0169b3 | 1709 | if (ext1_ee_len + ext2_ee_len > EXT_INIT_MAX_LEN) |
471d4011 | 1710 | return 0; |
bbf2f9fb | 1711 | #ifdef AGGRESSIVE_TEST |
b939e376 | 1712 | if (ext1_ee_len >= 4) |
a86c6181 AT |
1713 | return 0; |
1714 | #endif | |
1715 | ||
bf89d16f | 1716 | if (ext4_ext_pblock(ex1) + ext1_ee_len == ext4_ext_pblock(ex2)) |
a86c6181 AT |
1717 | return 1; |
1718 | return 0; | |
1719 | } | |
1720 | ||
56055d3a AA |
1721 | /* |
1722 | * This function tries to merge the "ex" extent to the next extent in the tree. | |
1723 | * It always tries to merge towards right. If you want to merge towards | |
1724 | * left, pass "ex - 1" as argument instead of "ex". | |
1725 | * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns | |
1726 | * 1 if they got merged. | |
1727 | */ | |
197217a5 | 1728 | static int ext4_ext_try_to_merge_right(struct inode *inode, |
1f109d5a TT |
1729 | struct ext4_ext_path *path, |
1730 | struct ext4_extent *ex) | |
56055d3a AA |
1731 | { |
1732 | struct ext4_extent_header *eh; | |
1733 | unsigned int depth, len; | |
1734 | int merge_done = 0; | |
56055d3a AA |
1735 | |
1736 | depth = ext_depth(inode); | |
1737 | BUG_ON(path[depth].p_hdr == NULL); | |
1738 | eh = path[depth].p_hdr; | |
1739 | ||
1740 | while (ex < EXT_LAST_EXTENT(eh)) { | |
1741 | if (!ext4_can_extents_be_merged(inode, ex, ex + 1)) | |
1742 | break; | |
1743 | /* merge with next extent! */ | |
56055d3a AA |
1744 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
1745 | + ext4_ext_get_actual_len(ex + 1)); | |
56055d3a AA |
1746 | |
1747 | if (ex + 1 < EXT_LAST_EXTENT(eh)) { | |
1748 | len = (EXT_LAST_EXTENT(eh) - ex - 1) | |
1749 | * sizeof(struct ext4_extent); | |
1750 | memmove(ex + 1, ex + 2, len); | |
1751 | } | |
e8546d06 | 1752 | le16_add_cpu(&eh->eh_entries, -1); |
56055d3a AA |
1753 | merge_done = 1; |
1754 | WARN_ON(eh->eh_entries == 0); | |
1755 | if (!eh->eh_entries) | |
24676da4 | 1756 | EXT4_ERROR_INODE(inode, "eh->eh_entries = 0!"); |
56055d3a AA |
1757 | } |
1758 | ||
1759 | return merge_done; | |
1760 | } | |
1761 | ||
ecb94f5f TT |
1762 | /* |
1763 | * This function does a very simple check to see if we can collapse | |
1764 | * an extent tree with a single extent tree leaf block into the inode. | |
1765 | */ | |
1766 | static void ext4_ext_try_to_merge_up(handle_t *handle, | |
1767 | struct inode *inode, | |
1768 | struct ext4_ext_path *path) | |
1769 | { | |
1770 | size_t s; | |
1771 | unsigned max_root = ext4_ext_space_root(inode, 0); | |
1772 | ext4_fsblk_t blk; | |
1773 | ||
1774 | if ((path[0].p_depth != 1) || | |
1775 | (le16_to_cpu(path[0].p_hdr->eh_entries) != 1) || | |
1776 | (le16_to_cpu(path[1].p_hdr->eh_entries) > max_root)) | |
1777 | return; | |
1778 | ||
1779 | /* | |
1780 | * We need to modify the block allocation bitmap and the block | |
1781 | * group descriptor to release the extent tree block. If we | |
1782 | * can't get the journal credits, give up. | |
1783 | */ | |
1784 | if (ext4_journal_extend(handle, 2)) | |
1785 | return; | |
1786 | ||
1787 | /* | |
1788 | * Copy the extent data up to the inode | |
1789 | */ | |
1790 | blk = ext4_idx_pblock(path[0].p_idx); | |
1791 | s = le16_to_cpu(path[1].p_hdr->eh_entries) * | |
1792 | sizeof(struct ext4_extent_idx); | |
1793 | s += sizeof(struct ext4_extent_header); | |
1794 | ||
1795 | memcpy(path[0].p_hdr, path[1].p_hdr, s); | |
1796 | path[0].p_depth = 0; | |
1797 | path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) + | |
1798 | (path[1].p_ext - EXT_FIRST_EXTENT(path[1].p_hdr)); | |
1799 | path[0].p_hdr->eh_max = cpu_to_le16(max_root); | |
1800 | ||
1801 | brelse(path[1].p_bh); | |
1802 | ext4_free_blocks(handle, inode, NULL, blk, 1, | |
7d734532 JK |
1803 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET | |
1804 | EXT4_FREE_BLOCKS_RESERVE); | |
ecb94f5f TT |
1805 | } |
1806 | ||
197217a5 YY |
1807 | /* |
1808 | * This function tries to merge the @ex extent to neighbours in the tree. | |
1809 | * return 1 if merge left else 0. | |
1810 | */ | |
ecb94f5f TT |
1811 | static void ext4_ext_try_to_merge(handle_t *handle, |
1812 | struct inode *inode, | |
197217a5 YY |
1813 | struct ext4_ext_path *path, |
1814 | struct ext4_extent *ex) { | |
1815 | struct ext4_extent_header *eh; | |
1816 | unsigned int depth; | |
1817 | int merge_done = 0; | |
197217a5 YY |
1818 | |
1819 | depth = ext_depth(inode); | |
1820 | BUG_ON(path[depth].p_hdr == NULL); | |
1821 | eh = path[depth].p_hdr; | |
1822 | ||
1823 | if (ex > EXT_FIRST_EXTENT(eh)) | |
1824 | merge_done = ext4_ext_try_to_merge_right(inode, path, ex - 1); | |
1825 | ||
1826 | if (!merge_done) | |
ecb94f5f | 1827 | (void) ext4_ext_try_to_merge_right(inode, path, ex); |
197217a5 | 1828 | |
ecb94f5f | 1829 | ext4_ext_try_to_merge_up(handle, inode, path); |
197217a5 YY |
1830 | } |
1831 | ||
25d14f98 AA |
1832 | /* |
1833 | * check if a portion of the "newext" extent overlaps with an | |
1834 | * existing extent. | |
1835 | * | |
1836 | * If there is an overlap discovered, it updates the length of the newext | |
1837 | * such that there will be no overlap, and then returns 1. | |
1838 | * If there is no overlap found, it returns 0. | |
1839 | */ | |
4d33b1ef TT |
1840 | static unsigned int ext4_ext_check_overlap(struct ext4_sb_info *sbi, |
1841 | struct inode *inode, | |
1f109d5a TT |
1842 | struct ext4_extent *newext, |
1843 | struct ext4_ext_path *path) | |
25d14f98 | 1844 | { |
725d26d3 | 1845 | ext4_lblk_t b1, b2; |
25d14f98 AA |
1846 | unsigned int depth, len1; |
1847 | unsigned int ret = 0; | |
1848 | ||
1849 | b1 = le32_to_cpu(newext->ee_block); | |
a2df2a63 | 1850 | len1 = ext4_ext_get_actual_len(newext); |
25d14f98 AA |
1851 | depth = ext_depth(inode); |
1852 | if (!path[depth].p_ext) | |
1853 | goto out; | |
f5a44db5 | 1854 | b2 = EXT4_LBLK_CMASK(sbi, le32_to_cpu(path[depth].p_ext->ee_block)); |
25d14f98 AA |
1855 | |
1856 | /* | |
1857 | * get the next allocated block if the extent in the path | |
2b2d6d01 | 1858 | * is before the requested block(s) |
25d14f98 AA |
1859 | */ |
1860 | if (b2 < b1) { | |
1861 | b2 = ext4_ext_next_allocated_block(path); | |
f17722f9 | 1862 | if (b2 == EXT_MAX_BLOCKS) |
25d14f98 | 1863 | goto out; |
f5a44db5 | 1864 | b2 = EXT4_LBLK_CMASK(sbi, b2); |
25d14f98 AA |
1865 | } |
1866 | ||
725d26d3 | 1867 | /* check for wrap through zero on extent logical start block*/ |
25d14f98 | 1868 | if (b1 + len1 < b1) { |
f17722f9 | 1869 | len1 = EXT_MAX_BLOCKS - b1; |
25d14f98 AA |
1870 | newext->ee_len = cpu_to_le16(len1); |
1871 | ret = 1; | |
1872 | } | |
1873 | ||
1874 | /* check for overlap */ | |
1875 | if (b1 + len1 > b2) { | |
1876 | newext->ee_len = cpu_to_le16(b2 - b1); | |
1877 | ret = 1; | |
1878 | } | |
1879 | out: | |
1880 | return ret; | |
1881 | } | |
1882 | ||
a86c6181 | 1883 | /* |
d0d856e8 RD |
1884 | * ext4_ext_insert_extent: |
1885 | * tries to merge requsted extent into the existing extent or | |
1886 | * inserts requested extent as new one into the tree, | |
1887 | * creating new leaf in the no-space case. | |
a86c6181 AT |
1888 | */ |
1889 | int ext4_ext_insert_extent(handle_t *handle, struct inode *inode, | |
1890 | struct ext4_ext_path *path, | |
107a7bd3 | 1891 | struct ext4_extent *newext, int gb_flags) |
a86c6181 | 1892 | { |
af5bc92d | 1893 | struct ext4_extent_header *eh; |
a86c6181 AT |
1894 | struct ext4_extent *ex, *fex; |
1895 | struct ext4_extent *nearex; /* nearest extent */ | |
1896 | struct ext4_ext_path *npath = NULL; | |
725d26d3 AK |
1897 | int depth, len, err; |
1898 | ext4_lblk_t next; | |
107a7bd3 | 1899 | int mb_flags = 0; |
a86c6181 | 1900 | |
273df556 FM |
1901 | if (unlikely(ext4_ext_get_actual_len(newext) == 0)) { |
1902 | EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0"); | |
1903 | return -EIO; | |
1904 | } | |
a86c6181 AT |
1905 | depth = ext_depth(inode); |
1906 | ex = path[depth].p_ext; | |
be8981be | 1907 | eh = path[depth].p_hdr; |
273df556 FM |
1908 | if (unlikely(path[depth].p_hdr == NULL)) { |
1909 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); | |
1910 | return -EIO; | |
1911 | } | |
a86c6181 AT |
1912 | |
1913 | /* try to insert block into found extent and return */ | |
107a7bd3 | 1914 | if (ex && !(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) { |
a2df2a63 AA |
1915 | |
1916 | /* | |
be8981be LC |
1917 | * Try to see whether we should rather test the extent on |
1918 | * right from ex, or from the left of ex. This is because | |
1919 | * ext4_ext_find_extent() can return either extent on the | |
1920 | * left, or on the right from the searched position. This | |
1921 | * will make merging more effective. | |
a2df2a63 | 1922 | */ |
be8981be LC |
1923 | if (ex < EXT_LAST_EXTENT(eh) && |
1924 | (le32_to_cpu(ex->ee_block) + | |
1925 | ext4_ext_get_actual_len(ex) < | |
1926 | le32_to_cpu(newext->ee_block))) { | |
1927 | ex += 1; | |
1928 | goto prepend; | |
1929 | } else if ((ex > EXT_FIRST_EXTENT(eh)) && | |
1930 | (le32_to_cpu(newext->ee_block) + | |
1931 | ext4_ext_get_actual_len(newext) < | |
1932 | le32_to_cpu(ex->ee_block))) | |
1933 | ex -= 1; | |
1934 | ||
1935 | /* Try to append newex to the ex */ | |
1936 | if (ext4_can_extents_be_merged(inode, ex, newext)) { | |
1937 | ext_debug("append [%d]%d block to %u:[%d]%d" | |
1938 | "(from %llu)\n", | |
1939 | ext4_ext_is_uninitialized(newext), | |
1940 | ext4_ext_get_actual_len(newext), | |
1941 | le32_to_cpu(ex->ee_block), | |
1942 | ext4_ext_is_uninitialized(ex), | |
1943 | ext4_ext_get_actual_len(ex), | |
1944 | ext4_ext_pblock(ex)); | |
1945 | err = ext4_ext_get_access(handle, inode, | |
1946 | path + depth); | |
1947 | if (err) | |
1948 | return err; | |
1949 | ||
be8981be | 1950 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) |
a2df2a63 | 1951 | + ext4_ext_get_actual_len(newext)); |
be8981be LC |
1952 | eh = path[depth].p_hdr; |
1953 | nearex = ex; | |
1954 | goto merge; | |
1955 | } | |
1956 | ||
1957 | prepend: | |
1958 | /* Try to prepend newex to the ex */ | |
1959 | if (ext4_can_extents_be_merged(inode, newext, ex)) { | |
1960 | ext_debug("prepend %u[%d]%d block to %u:[%d]%d" | |
1961 | "(from %llu)\n", | |
1962 | le32_to_cpu(newext->ee_block), | |
1963 | ext4_ext_is_uninitialized(newext), | |
1964 | ext4_ext_get_actual_len(newext), | |
1965 | le32_to_cpu(ex->ee_block), | |
1966 | ext4_ext_is_uninitialized(ex), | |
1967 | ext4_ext_get_actual_len(ex), | |
1968 | ext4_ext_pblock(ex)); | |
1969 | err = ext4_ext_get_access(handle, inode, | |
1970 | path + depth); | |
1971 | if (err) | |
1972 | return err; | |
1973 | ||
be8981be LC |
1974 | ex->ee_block = newext->ee_block; |
1975 | ext4_ext_store_pblock(ex, ext4_ext_pblock(newext)); | |
1976 | ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex) | |
1977 | + ext4_ext_get_actual_len(newext)); | |
be8981be LC |
1978 | eh = path[depth].p_hdr; |
1979 | nearex = ex; | |
1980 | goto merge; | |
1981 | } | |
a86c6181 AT |
1982 | } |
1983 | ||
a86c6181 AT |
1984 | depth = ext_depth(inode); |
1985 | eh = path[depth].p_hdr; | |
1986 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) | |
1987 | goto has_space; | |
1988 | ||
1989 | /* probably next leaf has space for us? */ | |
1990 | fex = EXT_LAST_EXTENT(eh); | |
598dbdf2 RD |
1991 | next = EXT_MAX_BLOCKS; |
1992 | if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block)) | |
5718789d | 1993 | next = ext4_ext_next_leaf_block(path); |
598dbdf2 | 1994 | if (next != EXT_MAX_BLOCKS) { |
32de6756 | 1995 | ext_debug("next leaf block - %u\n", next); |
a86c6181 | 1996 | BUG_ON(npath != NULL); |
107a7bd3 | 1997 | npath = ext4_ext_find_extent(inode, next, NULL, 0); |
a86c6181 AT |
1998 | if (IS_ERR(npath)) |
1999 | return PTR_ERR(npath); | |
2000 | BUG_ON(npath->p_depth != path->p_depth); | |
2001 | eh = npath[depth].p_hdr; | |
2002 | if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) { | |
25985edc | 2003 | ext_debug("next leaf isn't full(%d)\n", |
a86c6181 AT |
2004 | le16_to_cpu(eh->eh_entries)); |
2005 | path = npath; | |
ffb505ff | 2006 | goto has_space; |
a86c6181 AT |
2007 | } |
2008 | ext_debug("next leaf has no free space(%d,%d)\n", | |
2009 | le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max)); | |
2010 | } | |
2011 | ||
2012 | /* | |
d0d856e8 RD |
2013 | * There is no free space in the found leaf. |
2014 | * We're gonna add a new leaf in the tree. | |
a86c6181 | 2015 | */ |
107a7bd3 TT |
2016 | if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL) |
2017 | mb_flags = EXT4_MB_USE_RESERVED; | |
2018 | err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags, | |
2019 | path, newext); | |
a86c6181 AT |
2020 | if (err) |
2021 | goto cleanup; | |
2022 | depth = ext_depth(inode); | |
2023 | eh = path[depth].p_hdr; | |
2024 | ||
2025 | has_space: | |
2026 | nearex = path[depth].p_ext; | |
2027 | ||
7e028976 AM |
2028 | err = ext4_ext_get_access(handle, inode, path + depth); |
2029 | if (err) | |
a86c6181 AT |
2030 | goto cleanup; |
2031 | ||
2032 | if (!nearex) { | |
2033 | /* there is no extent in this leaf, create first one */ | |
32de6756 | 2034 | ext_debug("first extent in the leaf: %u:%llu:[%d]%d\n", |
8c55e204 | 2035 | le32_to_cpu(newext->ee_block), |
bf89d16f | 2036 | ext4_ext_pblock(newext), |
553f9008 | 2037 | ext4_ext_is_uninitialized(newext), |
a2df2a63 | 2038 | ext4_ext_get_actual_len(newext)); |
80e675f9 EG |
2039 | nearex = EXT_FIRST_EXTENT(eh); |
2040 | } else { | |
2041 | if (le32_to_cpu(newext->ee_block) | |
8c55e204 | 2042 | > le32_to_cpu(nearex->ee_block)) { |
80e675f9 | 2043 | /* Insert after */ |
32de6756 YY |
2044 | ext_debug("insert %u:%llu:[%d]%d before: " |
2045 | "nearest %p\n", | |
80e675f9 EG |
2046 | le32_to_cpu(newext->ee_block), |
2047 | ext4_ext_pblock(newext), | |
2048 | ext4_ext_is_uninitialized(newext), | |
2049 | ext4_ext_get_actual_len(newext), | |
2050 | nearex); | |
2051 | nearex++; | |
2052 | } else { | |
2053 | /* Insert before */ | |
2054 | BUG_ON(newext->ee_block == nearex->ee_block); | |
32de6756 YY |
2055 | ext_debug("insert %u:%llu:[%d]%d after: " |
2056 | "nearest %p\n", | |
8c55e204 | 2057 | le32_to_cpu(newext->ee_block), |
bf89d16f | 2058 | ext4_ext_pblock(newext), |
553f9008 | 2059 | ext4_ext_is_uninitialized(newext), |
a2df2a63 | 2060 | ext4_ext_get_actual_len(newext), |
80e675f9 EG |
2061 | nearex); |
2062 | } | |
2063 | len = EXT_LAST_EXTENT(eh) - nearex + 1; | |
2064 | if (len > 0) { | |
32de6756 | 2065 | ext_debug("insert %u:%llu:[%d]%d: " |
80e675f9 EG |
2066 | "move %d extents from 0x%p to 0x%p\n", |
2067 | le32_to_cpu(newext->ee_block), | |
2068 | ext4_ext_pblock(newext), | |
2069 | ext4_ext_is_uninitialized(newext), | |
2070 | ext4_ext_get_actual_len(newext), | |
2071 | len, nearex, nearex + 1); | |
2072 | memmove(nearex + 1, nearex, | |
2073 | len * sizeof(struct ext4_extent)); | |
a86c6181 | 2074 | } |
a86c6181 AT |
2075 | } |
2076 | ||
e8546d06 | 2077 | le16_add_cpu(&eh->eh_entries, 1); |
80e675f9 | 2078 | path[depth].p_ext = nearex; |
a86c6181 | 2079 | nearex->ee_block = newext->ee_block; |
bf89d16f | 2080 | ext4_ext_store_pblock(nearex, ext4_ext_pblock(newext)); |
a86c6181 | 2081 | nearex->ee_len = newext->ee_len; |
a86c6181 AT |
2082 | |
2083 | merge: | |
e7bcf823 | 2084 | /* try to merge extents */ |
107a7bd3 | 2085 | if (!(gb_flags & EXT4_GET_BLOCKS_PRE_IO)) |
ecb94f5f | 2086 | ext4_ext_try_to_merge(handle, inode, path, nearex); |
a86c6181 | 2087 | |
a86c6181 AT |
2088 | |
2089 | /* time to correct all indexes above */ | |
2090 | err = ext4_ext_correct_indexes(handle, inode, path); | |
2091 | if (err) | |
2092 | goto cleanup; | |
2093 | ||
ecb94f5f | 2094 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
a86c6181 AT |
2095 | |
2096 | cleanup: | |
2097 | if (npath) { | |
2098 | ext4_ext_drop_refs(npath); | |
2099 | kfree(npath); | |
2100 | } | |
a86c6181 AT |
2101 | return err; |
2102 | } | |
2103 | ||
91dd8c11 LC |
2104 | static int ext4_fill_fiemap_extents(struct inode *inode, |
2105 | ext4_lblk_t block, ext4_lblk_t num, | |
2106 | struct fiemap_extent_info *fieinfo) | |
6873fa0d ES |
2107 | { |
2108 | struct ext4_ext_path *path = NULL; | |
6873fa0d | 2109 | struct ext4_extent *ex; |
69eb33dc | 2110 | struct extent_status es; |
91dd8c11 | 2111 | ext4_lblk_t next, next_del, start = 0, end = 0; |
6873fa0d | 2112 | ext4_lblk_t last = block + num; |
91dd8c11 LC |
2113 | int exists, depth = 0, err = 0; |
2114 | unsigned int flags = 0; | |
2115 | unsigned char blksize_bits = inode->i_sb->s_blocksize_bits; | |
6873fa0d | 2116 | |
f17722f9 | 2117 | while (block < last && block != EXT_MAX_BLOCKS) { |
6873fa0d ES |
2118 | num = last - block; |
2119 | /* find extent for this block */ | |
fab3a549 | 2120 | down_read(&EXT4_I(inode)->i_data_sem); |
91dd8c11 LC |
2121 | |
2122 | if (path && ext_depth(inode) != depth) { | |
2123 | /* depth was changed. we have to realloc path */ | |
2124 | kfree(path); | |
2125 | path = NULL; | |
2126 | } | |
2127 | ||
107a7bd3 | 2128 | path = ext4_ext_find_extent(inode, block, path, 0); |
6873fa0d | 2129 | if (IS_ERR(path)) { |
91dd8c11 | 2130 | up_read(&EXT4_I(inode)->i_data_sem); |
6873fa0d ES |
2131 | err = PTR_ERR(path); |
2132 | path = NULL; | |
2133 | break; | |
2134 | } | |
2135 | ||
2136 | depth = ext_depth(inode); | |
273df556 | 2137 | if (unlikely(path[depth].p_hdr == NULL)) { |
91dd8c11 | 2138 | up_read(&EXT4_I(inode)->i_data_sem); |
273df556 FM |
2139 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); |
2140 | err = -EIO; | |
2141 | break; | |
2142 | } | |
6873fa0d ES |
2143 | ex = path[depth].p_ext; |
2144 | next = ext4_ext_next_allocated_block(path); | |
91dd8c11 | 2145 | ext4_ext_drop_refs(path); |
6873fa0d | 2146 | |
91dd8c11 | 2147 | flags = 0; |
6873fa0d ES |
2148 | exists = 0; |
2149 | if (!ex) { | |
2150 | /* there is no extent yet, so try to allocate | |
2151 | * all requested space */ | |
2152 | start = block; | |
2153 | end = block + num; | |
2154 | } else if (le32_to_cpu(ex->ee_block) > block) { | |
2155 | /* need to allocate space before found extent */ | |
2156 | start = block; | |
2157 | end = le32_to_cpu(ex->ee_block); | |
2158 | if (block + num < end) | |
2159 | end = block + num; | |
2160 | } else if (block >= le32_to_cpu(ex->ee_block) | |
2161 | + ext4_ext_get_actual_len(ex)) { | |
2162 | /* need to allocate space after found extent */ | |
2163 | start = block; | |
2164 | end = block + num; | |
2165 | if (end >= next) | |
2166 | end = next; | |
2167 | } else if (block >= le32_to_cpu(ex->ee_block)) { | |
2168 | /* | |
2169 | * some part of requested space is covered | |
2170 | * by found extent | |
2171 | */ | |
2172 | start = block; | |
2173 | end = le32_to_cpu(ex->ee_block) | |
2174 | + ext4_ext_get_actual_len(ex); | |
2175 | if (block + num < end) | |
2176 | end = block + num; | |
2177 | exists = 1; | |
2178 | } else { | |
2179 | BUG(); | |
2180 | } | |
2181 | BUG_ON(end <= start); | |
2182 | ||
2183 | if (!exists) { | |
69eb33dc ZL |
2184 | es.es_lblk = start; |
2185 | es.es_len = end - start; | |
2186 | es.es_pblk = 0; | |
6873fa0d | 2187 | } else { |
69eb33dc ZL |
2188 | es.es_lblk = le32_to_cpu(ex->ee_block); |
2189 | es.es_len = ext4_ext_get_actual_len(ex); | |
2190 | es.es_pblk = ext4_ext_pblock(ex); | |
91dd8c11 LC |
2191 | if (ext4_ext_is_uninitialized(ex)) |
2192 | flags |= FIEMAP_EXTENT_UNWRITTEN; | |
6873fa0d ES |
2193 | } |
2194 | ||
91dd8c11 | 2195 | /* |
69eb33dc ZL |
2196 | * Find delayed extent and update es accordingly. We call |
2197 | * it even in !exists case to find out whether es is the | |
91dd8c11 LC |
2198 | * last existing extent or not. |
2199 | */ | |
69eb33dc | 2200 | next_del = ext4_find_delayed_extent(inode, &es); |
91dd8c11 LC |
2201 | if (!exists && next_del) { |
2202 | exists = 1; | |
72dac95d JL |
2203 | flags |= (FIEMAP_EXTENT_DELALLOC | |
2204 | FIEMAP_EXTENT_UNKNOWN); | |
91dd8c11 LC |
2205 | } |
2206 | up_read(&EXT4_I(inode)->i_data_sem); | |
2207 | ||
69eb33dc ZL |
2208 | if (unlikely(es.es_len == 0)) { |
2209 | EXT4_ERROR_INODE(inode, "es.es_len == 0"); | |
273df556 FM |
2210 | err = -EIO; |
2211 | break; | |
2212 | } | |
6873fa0d | 2213 | |
f7fec032 ZL |
2214 | /* |
2215 | * This is possible iff next == next_del == EXT_MAX_BLOCKS. | |
2216 | * we need to check next == EXT_MAX_BLOCKS because it is | |
2217 | * possible that an extent is with unwritten and delayed | |
2218 | * status due to when an extent is delayed allocated and | |
2219 | * is allocated by fallocate status tree will track both of | |
2220 | * them in a extent. | |
2221 | * | |
2222 | * So we could return a unwritten and delayed extent, and | |
2223 | * its block is equal to 'next'. | |
2224 | */ | |
2225 | if (next == next_del && next == EXT_MAX_BLOCKS) { | |
91dd8c11 LC |
2226 | flags |= FIEMAP_EXTENT_LAST; |
2227 | if (unlikely(next_del != EXT_MAX_BLOCKS || | |
2228 | next != EXT_MAX_BLOCKS)) { | |
2229 | EXT4_ERROR_INODE(inode, | |
2230 | "next extent == %u, next " | |
2231 | "delalloc extent = %u", | |
2232 | next, next_del); | |
2233 | err = -EIO; | |
2234 | break; | |
2235 | } | |
6873fa0d ES |
2236 | } |
2237 | ||
91dd8c11 LC |
2238 | if (exists) { |
2239 | err = fiemap_fill_next_extent(fieinfo, | |
69eb33dc ZL |
2240 | (__u64)es.es_lblk << blksize_bits, |
2241 | (__u64)es.es_pblk << blksize_bits, | |
2242 | (__u64)es.es_len << blksize_bits, | |
91dd8c11 LC |
2243 | flags); |
2244 | if (err < 0) | |
2245 | break; | |
2246 | if (err == 1) { | |
2247 | err = 0; | |
2248 | break; | |
2249 | } | |
6873fa0d ES |
2250 | } |
2251 | ||
69eb33dc | 2252 | block = es.es_lblk + es.es_len; |
6873fa0d ES |
2253 | } |
2254 | ||
2255 | if (path) { | |
2256 | ext4_ext_drop_refs(path); | |
2257 | kfree(path); | |
2258 | } | |
2259 | ||
2260 | return err; | |
2261 | } | |
2262 | ||
a86c6181 | 2263 | /* |
d0d856e8 RD |
2264 | * ext4_ext_put_gap_in_cache: |
2265 | * calculate boundaries of the gap that the requested block fits into | |
a86c6181 AT |
2266 | * and cache this gap |
2267 | */ | |
09b88252 | 2268 | static void |
a86c6181 | 2269 | ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path, |
725d26d3 | 2270 | ext4_lblk_t block) |
a86c6181 AT |
2271 | { |
2272 | int depth = ext_depth(inode); | |
27b1b228 AS |
2273 | unsigned long len = 0; |
2274 | ext4_lblk_t lblock = 0; | |
a86c6181 AT |
2275 | struct ext4_extent *ex; |
2276 | ||
2277 | ex = path[depth].p_ext; | |
2278 | if (ex == NULL) { | |
69eb33dc ZL |
2279 | /* |
2280 | * there is no extent yet, so gap is [0;-] and we | |
2281 | * don't cache it | |
2282 | */ | |
a86c6181 AT |
2283 | ext_debug("cache gap(whole file):"); |
2284 | } else if (block < le32_to_cpu(ex->ee_block)) { | |
2285 | lblock = block; | |
2286 | len = le32_to_cpu(ex->ee_block) - block; | |
bba90743 ES |
2287 | ext_debug("cache gap(before): %u [%u:%u]", |
2288 | block, | |
2289 | le32_to_cpu(ex->ee_block), | |
2290 | ext4_ext_get_actual_len(ex)); | |
d100eef2 ZL |
2291 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
2292 | ext4_es_insert_extent(inode, lblock, len, ~0, | |
2293 | EXTENT_STATUS_HOLE); | |
a86c6181 | 2294 | } else if (block >= le32_to_cpu(ex->ee_block) |
a2df2a63 | 2295 | + ext4_ext_get_actual_len(ex)) { |
725d26d3 | 2296 | ext4_lblk_t next; |
8c55e204 | 2297 | lblock = le32_to_cpu(ex->ee_block) |
a2df2a63 | 2298 | + ext4_ext_get_actual_len(ex); |
725d26d3 AK |
2299 | |
2300 | next = ext4_ext_next_allocated_block(path); | |
bba90743 ES |
2301 | ext_debug("cache gap(after): [%u:%u] %u", |
2302 | le32_to_cpu(ex->ee_block), | |
2303 | ext4_ext_get_actual_len(ex), | |
2304 | block); | |
725d26d3 AK |
2305 | BUG_ON(next == lblock); |
2306 | len = next - lblock; | |
d100eef2 ZL |
2307 | if (!ext4_find_delalloc_range(inode, lblock, lblock + len - 1)) |
2308 | ext4_es_insert_extent(inode, lblock, len, ~0, | |
2309 | EXTENT_STATUS_HOLE); | |
a86c6181 | 2310 | } else { |
a86c6181 AT |
2311 | BUG(); |
2312 | } | |
2313 | ||
bba90743 | 2314 | ext_debug(" -> %u:%lu\n", lblock, len); |
a86c6181 AT |
2315 | } |
2316 | ||
2317 | /* | |
d0d856e8 RD |
2318 | * ext4_ext_rm_idx: |
2319 | * removes index from the index block. | |
a86c6181 | 2320 | */ |
1d03ec98 | 2321 | static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, |
c36575e6 | 2322 | struct ext4_ext_path *path, int depth) |
a86c6181 | 2323 | { |
a86c6181 | 2324 | int err; |
f65e6fba | 2325 | ext4_fsblk_t leaf; |
a86c6181 AT |
2326 | |
2327 | /* free index block */ | |
c36575e6 FL |
2328 | depth--; |
2329 | path = path + depth; | |
bf89d16f | 2330 | leaf = ext4_idx_pblock(path->p_idx); |
273df556 FM |
2331 | if (unlikely(path->p_hdr->eh_entries == 0)) { |
2332 | EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0"); | |
2333 | return -EIO; | |
2334 | } | |
7e028976 AM |
2335 | err = ext4_ext_get_access(handle, inode, path); |
2336 | if (err) | |
a86c6181 | 2337 | return err; |
0e1147b0 RD |
2338 | |
2339 | if (path->p_idx != EXT_LAST_INDEX(path->p_hdr)) { | |
2340 | int len = EXT_LAST_INDEX(path->p_hdr) - path->p_idx; | |
2341 | len *= sizeof(struct ext4_extent_idx); | |
2342 | memmove(path->p_idx, path->p_idx + 1, len); | |
2343 | } | |
2344 | ||
e8546d06 | 2345 | le16_add_cpu(&path->p_hdr->eh_entries, -1); |
7e028976 AM |
2346 | err = ext4_ext_dirty(handle, inode, path); |
2347 | if (err) | |
a86c6181 | 2348 | return err; |
2ae02107 | 2349 | ext_debug("index is empty, remove it, free block %llu\n", leaf); |
d8990240 AK |
2350 | trace_ext4_ext_rm_idx(inode, leaf); |
2351 | ||
7dc57615 | 2352 | ext4_free_blocks(handle, inode, NULL, leaf, 1, |
e6362609 | 2353 | EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
c36575e6 FL |
2354 | |
2355 | while (--depth >= 0) { | |
2356 | if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr)) | |
2357 | break; | |
2358 | path--; | |
2359 | err = ext4_ext_get_access(handle, inode, path); | |
2360 | if (err) | |
2361 | break; | |
2362 | path->p_idx->ei_block = (path+1)->p_idx->ei_block; | |
2363 | err = ext4_ext_dirty(handle, inode, path); | |
2364 | if (err) | |
2365 | break; | |
2366 | } | |
a86c6181 AT |
2367 | return err; |
2368 | } | |
2369 | ||
2370 | /* | |
ee12b630 MC |
2371 | * ext4_ext_calc_credits_for_single_extent: |
2372 | * This routine returns max. credits that needed to insert an extent | |
2373 | * to the extent tree. | |
2374 | * When pass the actual path, the caller should calculate credits | |
2375 | * under i_data_sem. | |
a86c6181 | 2376 | */ |
525f4ed8 | 2377 | int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks, |
a86c6181 AT |
2378 | struct ext4_ext_path *path) |
2379 | { | |
a86c6181 | 2380 | if (path) { |
ee12b630 | 2381 | int depth = ext_depth(inode); |
f3bd1f3f | 2382 | int ret = 0; |
ee12b630 | 2383 | |
a86c6181 | 2384 | /* probably there is space in leaf? */ |
a86c6181 | 2385 | if (le16_to_cpu(path[depth].p_hdr->eh_entries) |
ee12b630 | 2386 | < le16_to_cpu(path[depth].p_hdr->eh_max)) { |
a86c6181 | 2387 | |
ee12b630 MC |
2388 | /* |
2389 | * There are some space in the leaf tree, no | |
2390 | * need to account for leaf block credit | |
2391 | * | |
2392 | * bitmaps and block group descriptor blocks | |
df3ab170 | 2393 | * and other metadata blocks still need to be |
ee12b630 MC |
2394 | * accounted. |
2395 | */ | |
525f4ed8 | 2396 | /* 1 bitmap, 1 block group descriptor */ |
ee12b630 | 2397 | ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb); |
5887e98b | 2398 | return ret; |
ee12b630 MC |
2399 | } |
2400 | } | |
a86c6181 | 2401 | |
525f4ed8 | 2402 | return ext4_chunk_trans_blocks(inode, nrblocks); |
ee12b630 | 2403 | } |
a86c6181 | 2404 | |
ee12b630 | 2405 | /* |
fffb2739 | 2406 | * How many index/leaf blocks need to change/allocate to add @extents extents? |
ee12b630 | 2407 | * |
fffb2739 JK |
2408 | * If we add a single extent, then in the worse case, each tree level |
2409 | * index/leaf need to be changed in case of the tree split. | |
ee12b630 | 2410 | * |
fffb2739 JK |
2411 | * If more extents are inserted, they could cause the whole tree split more |
2412 | * than once, but this is really rare. | |
ee12b630 | 2413 | */ |
fffb2739 | 2414 | int ext4_ext_index_trans_blocks(struct inode *inode, int extents) |
ee12b630 MC |
2415 | { |
2416 | int index; | |
f19d5870 TM |
2417 | int depth; |
2418 | ||
2419 | /* If we are converting the inline data, only one is needed here. */ | |
2420 | if (ext4_has_inline_data(inode)) | |
2421 | return 1; | |
2422 | ||
2423 | depth = ext_depth(inode); | |
a86c6181 | 2424 | |
fffb2739 | 2425 | if (extents <= 1) |
ee12b630 MC |
2426 | index = depth * 2; |
2427 | else | |
2428 | index = depth * 3; | |
a86c6181 | 2429 | |
ee12b630 | 2430 | return index; |
a86c6181 AT |
2431 | } |
2432 | ||
981250ca TT |
2433 | static inline int get_default_free_blocks_flags(struct inode *inode) |
2434 | { | |
2435 | if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) | |
2436 | return EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET; | |
2437 | else if (ext4_should_journal_data(inode)) | |
2438 | return EXT4_FREE_BLOCKS_FORGET; | |
2439 | return 0; | |
2440 | } | |
2441 | ||
a86c6181 | 2442 | static int ext4_remove_blocks(handle_t *handle, struct inode *inode, |
0aa06000 | 2443 | struct ext4_extent *ex, |
d23142c6 | 2444 | long long *partial_cluster, |
0aa06000 | 2445 | ext4_lblk_t from, ext4_lblk_t to) |
a86c6181 | 2446 | { |
0aa06000 | 2447 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
a2df2a63 | 2448 | unsigned short ee_len = ext4_ext_get_actual_len(ex); |
0aa06000 | 2449 | ext4_fsblk_t pblk; |
981250ca | 2450 | int flags = get_default_free_blocks_flags(inode); |
18888cf0 | 2451 | |
0aa06000 TT |
2452 | /* |
2453 | * For bigalloc file systems, we never free a partial cluster | |
2454 | * at the beginning of the extent. Instead, we make a note | |
2455 | * that we tried freeing the cluster, and check to see if we | |
2456 | * need to free it on a subsequent call to ext4_remove_blocks, | |
2457 | * or at the end of the ext4_truncate() operation. | |
2458 | */ | |
2459 | flags |= EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER; | |
2460 | ||
d8990240 | 2461 | trace_ext4_remove_blocks(inode, ex, from, to, *partial_cluster); |
0aa06000 TT |
2462 | /* |
2463 | * If we have a partial cluster, and it's different from the | |
2464 | * cluster of the last block, we need to explicitly free the | |
2465 | * partial cluster here. | |
2466 | */ | |
2467 | pblk = ext4_ext_pblock(ex) + ee_len - 1; | |
d23142c6 LC |
2468 | if ((*partial_cluster > 0) && |
2469 | (EXT4_B2C(sbi, pblk) != *partial_cluster)) { | |
0aa06000 TT |
2470 | ext4_free_blocks(handle, inode, NULL, |
2471 | EXT4_C2B(sbi, *partial_cluster), | |
2472 | sbi->s_cluster_ratio, flags); | |
2473 | *partial_cluster = 0; | |
2474 | } | |
2475 | ||
a86c6181 AT |
2476 | #ifdef EXTENTS_STATS |
2477 | { | |
2478 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
a86c6181 AT |
2479 | spin_lock(&sbi->s_ext_stats_lock); |
2480 | sbi->s_ext_blocks += ee_len; | |
2481 | sbi->s_ext_extents++; | |
2482 | if (ee_len < sbi->s_ext_min) | |
2483 | sbi->s_ext_min = ee_len; | |
2484 | if (ee_len > sbi->s_ext_max) | |
2485 | sbi->s_ext_max = ee_len; | |
2486 | if (ext_depth(inode) > sbi->s_depth_max) | |
2487 | sbi->s_depth_max = ext_depth(inode); | |
2488 | spin_unlock(&sbi->s_ext_stats_lock); | |
2489 | } | |
2490 | #endif | |
2491 | if (from >= le32_to_cpu(ex->ee_block) | |
a2df2a63 | 2492 | && to == le32_to_cpu(ex->ee_block) + ee_len - 1) { |
a86c6181 | 2493 | /* tail removal */ |
725d26d3 | 2494 | ext4_lblk_t num; |
d23142c6 | 2495 | unsigned int unaligned; |
725d26d3 | 2496 | |
a2df2a63 | 2497 | num = le32_to_cpu(ex->ee_block) + ee_len - from; |
0aa06000 | 2498 | pblk = ext4_ext_pblock(ex) + ee_len - num; |
d23142c6 LC |
2499 | /* |
2500 | * Usually we want to free partial cluster at the end of the | |
2501 | * extent, except for the situation when the cluster is still | |
2502 | * used by any other extent (partial_cluster is negative). | |
2503 | */ | |
2504 | if (*partial_cluster < 0 && | |
2505 | -(*partial_cluster) == EXT4_B2C(sbi, pblk + num - 1)) | |
2506 | flags |= EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER; | |
2507 | ||
2508 | ext_debug("free last %u blocks starting %llu partial %lld\n", | |
2509 | num, pblk, *partial_cluster); | |
0aa06000 TT |
2510 | ext4_free_blocks(handle, inode, NULL, pblk, num, flags); |
2511 | /* | |
2512 | * If the block range to be freed didn't start at the | |
2513 | * beginning of a cluster, and we removed the entire | |
d23142c6 LC |
2514 | * extent and the cluster is not used by any other extent, |
2515 | * save the partial cluster here, since we might need to | |
2516 | * delete if we determine that the truncate operation has | |
2517 | * removed all of the blocks in the cluster. | |
2518 | * | |
2519 | * On the other hand, if we did not manage to free the whole | |
2520 | * extent, we have to mark the cluster as used (store negative | |
2521 | * cluster number in partial_cluster). | |
0aa06000 | 2522 | */ |
f5a44db5 | 2523 | unaligned = EXT4_PBLK_COFF(sbi, pblk); |
d23142c6 LC |
2524 | if (unaligned && (ee_len == num) && |
2525 | (*partial_cluster != -((long long)EXT4_B2C(sbi, pblk)))) | |
0aa06000 | 2526 | *partial_cluster = EXT4_B2C(sbi, pblk); |
d23142c6 LC |
2527 | else if (unaligned) |
2528 | *partial_cluster = -((long long)EXT4_B2C(sbi, pblk)); | |
2529 | else if (*partial_cluster > 0) | |
0aa06000 | 2530 | *partial_cluster = 0; |
78fb9cdf LC |
2531 | } else |
2532 | ext4_error(sbi->s_sb, "strange request: removal(2) " | |
2533 | "%u-%u from %u:%u\n", | |
2534 | from, to, le32_to_cpu(ex->ee_block), ee_len); | |
a86c6181 AT |
2535 | return 0; |
2536 | } | |
2537 | ||
d583fb87 AH |
2538 | |
2539 | /* | |
2540 | * ext4_ext_rm_leaf() Removes the extents associated with the | |
2541 | * blocks appearing between "start" and "end", and splits the extents | |
2542 | * if "start" and "end" appear in the same extent | |
2543 | * | |
2544 | * @handle: The journal handle | |
2545 | * @inode: The files inode | |
2546 | * @path: The path to the leaf | |
d23142c6 LC |
2547 | * @partial_cluster: The cluster which we'll have to free if all extents |
2548 | * has been released from it. It gets negative in case | |
2549 | * that the cluster is still used. | |
d583fb87 AH |
2550 | * @start: The first block to remove |
2551 | * @end: The last block to remove | |
2552 | */ | |
a86c6181 AT |
2553 | static int |
2554 | ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, | |
d23142c6 LC |
2555 | struct ext4_ext_path *path, |
2556 | long long *partial_cluster, | |
0aa06000 | 2557 | ext4_lblk_t start, ext4_lblk_t end) |
a86c6181 | 2558 | { |
0aa06000 | 2559 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
a86c6181 AT |
2560 | int err = 0, correct_index = 0; |
2561 | int depth = ext_depth(inode), credits; | |
2562 | struct ext4_extent_header *eh; | |
750c9c47 | 2563 | ext4_lblk_t a, b; |
725d26d3 AK |
2564 | unsigned num; |
2565 | ext4_lblk_t ex_ee_block; | |
a86c6181 | 2566 | unsigned short ex_ee_len; |
a2df2a63 | 2567 | unsigned uninitialized = 0; |
a86c6181 | 2568 | struct ext4_extent *ex; |
d23142c6 | 2569 | ext4_fsblk_t pblk; |
a86c6181 | 2570 | |
c29c0ae7 | 2571 | /* the header must be checked already in ext4_ext_remove_space() */ |
5f95d21f | 2572 | ext_debug("truncate since %u in leaf to %u\n", start, end); |
a86c6181 AT |
2573 | if (!path[depth].p_hdr) |
2574 | path[depth].p_hdr = ext_block_hdr(path[depth].p_bh); | |
2575 | eh = path[depth].p_hdr; | |
273df556 FM |
2576 | if (unlikely(path[depth].p_hdr == NULL)) { |
2577 | EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL", depth); | |
2578 | return -EIO; | |
2579 | } | |
a86c6181 | 2580 | /* find where to start removing */ |
6ae06ff5 AS |
2581 | ex = path[depth].p_ext; |
2582 | if (!ex) | |
2583 | ex = EXT_LAST_EXTENT(eh); | |
a86c6181 AT |
2584 | |
2585 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
a2df2a63 | 2586 | ex_ee_len = ext4_ext_get_actual_len(ex); |
a86c6181 | 2587 | |
d8990240 AK |
2588 | trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster); |
2589 | ||
a86c6181 AT |
2590 | while (ex >= EXT_FIRST_EXTENT(eh) && |
2591 | ex_ee_block + ex_ee_len > start) { | |
a41f2071 AK |
2592 | |
2593 | if (ext4_ext_is_uninitialized(ex)) | |
2594 | uninitialized = 1; | |
2595 | else | |
2596 | uninitialized = 0; | |
2597 | ||
553f9008 M |
2598 | ext_debug("remove ext %u:[%d]%d\n", ex_ee_block, |
2599 | uninitialized, ex_ee_len); | |
a86c6181 AT |
2600 | path[depth].p_ext = ex; |
2601 | ||
2602 | a = ex_ee_block > start ? ex_ee_block : start; | |
d583fb87 AH |
2603 | b = ex_ee_block+ex_ee_len - 1 < end ? |
2604 | ex_ee_block+ex_ee_len - 1 : end; | |
a86c6181 AT |
2605 | |
2606 | ext_debug(" border %u:%u\n", a, b); | |
2607 | ||
d583fb87 | 2608 | /* If this extent is beyond the end of the hole, skip it */ |
5f95d21f | 2609 | if (end < ex_ee_block) { |
d23142c6 LC |
2610 | /* |
2611 | * We're going to skip this extent and move to another, | |
2612 | * so if this extent is not cluster aligned we have | |
2613 | * to mark the current cluster as used to avoid | |
2614 | * accidentally freeing it later on | |
2615 | */ | |
2616 | pblk = ext4_ext_pblock(ex); | |
f5a44db5 | 2617 | if (EXT4_PBLK_COFF(sbi, pblk)) |
d23142c6 LC |
2618 | *partial_cluster = |
2619 | -((long long)EXT4_B2C(sbi, pblk)); | |
d583fb87 AH |
2620 | ex--; |
2621 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
2622 | ex_ee_len = ext4_ext_get_actual_len(ex); | |
2623 | continue; | |
750c9c47 | 2624 | } else if (b != ex_ee_block + ex_ee_len - 1) { |
dc1841d6 LC |
2625 | EXT4_ERROR_INODE(inode, |
2626 | "can not handle truncate %u:%u " | |
2627 | "on extent %u:%u", | |
2628 | start, end, ex_ee_block, | |
2629 | ex_ee_block + ex_ee_len - 1); | |
750c9c47 DM |
2630 | err = -EIO; |
2631 | goto out; | |
a86c6181 AT |
2632 | } else if (a != ex_ee_block) { |
2633 | /* remove tail of the extent */ | |
750c9c47 | 2634 | num = a - ex_ee_block; |
a86c6181 AT |
2635 | } else { |
2636 | /* remove whole extent: excellent! */ | |
a86c6181 | 2637 | num = 0; |
a86c6181 | 2638 | } |
34071da7 TT |
2639 | /* |
2640 | * 3 for leaf, sb, and inode plus 2 (bmap and group | |
2641 | * descriptor) for each block group; assume two block | |
2642 | * groups plus ex_ee_len/blocks_per_block_group for | |
2643 | * the worst case | |
2644 | */ | |
2645 | credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb)); | |
a86c6181 AT |
2646 | if (ex == EXT_FIRST_EXTENT(eh)) { |
2647 | correct_index = 1; | |
2648 | credits += (ext_depth(inode)) + 1; | |
2649 | } | |
5aca07eb | 2650 | credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
a86c6181 | 2651 | |
487caeef | 2652 | err = ext4_ext_truncate_extend_restart(handle, inode, credits); |
9102e4fa | 2653 | if (err) |
a86c6181 | 2654 | goto out; |
a86c6181 AT |
2655 | |
2656 | err = ext4_ext_get_access(handle, inode, path + depth); | |
2657 | if (err) | |
2658 | goto out; | |
2659 | ||
0aa06000 TT |
2660 | err = ext4_remove_blocks(handle, inode, ex, partial_cluster, |
2661 | a, b); | |
a86c6181 AT |
2662 | if (err) |
2663 | goto out; | |
2664 | ||
750c9c47 | 2665 | if (num == 0) |
d0d856e8 | 2666 | /* this extent is removed; mark slot entirely unused */ |
f65e6fba | 2667 | ext4_ext_store_pblock(ex, 0); |
a86c6181 | 2668 | |
a86c6181 | 2669 | ex->ee_len = cpu_to_le16(num); |
749269fa AA |
2670 | /* |
2671 | * Do not mark uninitialized if all the blocks in the | |
2672 | * extent have been removed. | |
2673 | */ | |
2674 | if (uninitialized && num) | |
a2df2a63 | 2675 | ext4_ext_mark_uninitialized(ex); |
d583fb87 AH |
2676 | /* |
2677 | * If the extent was completely released, | |
2678 | * we need to remove it from the leaf | |
2679 | */ | |
2680 | if (num == 0) { | |
f17722f9 | 2681 | if (end != EXT_MAX_BLOCKS - 1) { |
d583fb87 AH |
2682 | /* |
2683 | * For hole punching, we need to scoot all the | |
2684 | * extents up when an extent is removed so that | |
2685 | * we dont have blank extents in the middle | |
2686 | */ | |
2687 | memmove(ex, ex+1, (EXT_LAST_EXTENT(eh) - ex) * | |
2688 | sizeof(struct ext4_extent)); | |
2689 | ||
2690 | /* Now get rid of the one at the end */ | |
2691 | memset(EXT_LAST_EXTENT(eh), 0, | |
2692 | sizeof(struct ext4_extent)); | |
2693 | } | |
2694 | le16_add_cpu(&eh->eh_entries, -1); | |
d23142c6 | 2695 | } else if (*partial_cluster > 0) |
0aa06000 | 2696 | *partial_cluster = 0; |
d583fb87 | 2697 | |
750c9c47 DM |
2698 | err = ext4_ext_dirty(handle, inode, path + depth); |
2699 | if (err) | |
2700 | goto out; | |
2701 | ||
bf52c6f7 | 2702 | ext_debug("new extent: %u:%u:%llu\n", ex_ee_block, num, |
bf89d16f | 2703 | ext4_ext_pblock(ex)); |
a86c6181 AT |
2704 | ex--; |
2705 | ex_ee_block = le32_to_cpu(ex->ee_block); | |
a2df2a63 | 2706 | ex_ee_len = ext4_ext_get_actual_len(ex); |
a86c6181 AT |
2707 | } |
2708 | ||
2709 | if (correct_index && eh->eh_entries) | |
2710 | err = ext4_ext_correct_indexes(handle, inode, path); | |
2711 | ||
0aa06000 | 2712 | /* |
d23142c6 LC |
2713 | * Free the partial cluster only if the current extent does not |
2714 | * reference it. Otherwise we might free used cluster. | |
0aa06000 | 2715 | */ |
d23142c6 | 2716 | if (*partial_cluster > 0 && |
0aa06000 TT |
2717 | (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) != |
2718 | *partial_cluster)) { | |
981250ca | 2719 | int flags = get_default_free_blocks_flags(inode); |
0aa06000 TT |
2720 | |
2721 | ext4_free_blocks(handle, inode, NULL, | |
2722 | EXT4_C2B(sbi, *partial_cluster), | |
2723 | sbi->s_cluster_ratio, flags); | |
2724 | *partial_cluster = 0; | |
2725 | } | |
2726 | ||
a86c6181 AT |
2727 | /* if this leaf is free, then we should |
2728 | * remove it from index block above */ | |
2729 | if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL) | |
c36575e6 | 2730 | err = ext4_ext_rm_idx(handle, inode, path, depth); |
a86c6181 AT |
2731 | |
2732 | out: | |
2733 | return err; | |
2734 | } | |
2735 | ||
2736 | /* | |
d0d856e8 RD |
2737 | * ext4_ext_more_to_rm: |
2738 | * returns 1 if current index has to be freed (even partial) | |
a86c6181 | 2739 | */ |
09b88252 | 2740 | static int |
a86c6181 AT |
2741 | ext4_ext_more_to_rm(struct ext4_ext_path *path) |
2742 | { | |
2743 | BUG_ON(path->p_idx == NULL); | |
2744 | ||
2745 | if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr)) | |
2746 | return 0; | |
2747 | ||
2748 | /* | |
d0d856e8 | 2749 | * if truncate on deeper level happened, it wasn't partial, |
a86c6181 AT |
2750 | * so we have to consider current index for truncation |
2751 | */ | |
2752 | if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block) | |
2753 | return 0; | |
2754 | return 1; | |
2755 | } | |
2756 | ||
26a4c0c6 TT |
2757 | int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start, |
2758 | ext4_lblk_t end) | |
a86c6181 AT |
2759 | { |
2760 | struct super_block *sb = inode->i_sb; | |
2761 | int depth = ext_depth(inode); | |
968dee77 | 2762 | struct ext4_ext_path *path = NULL; |
d23142c6 | 2763 | long long partial_cluster = 0; |
a86c6181 | 2764 | handle_t *handle; |
6f2080e6 | 2765 | int i = 0, err = 0; |
a86c6181 | 2766 | |
5f95d21f | 2767 | ext_debug("truncate since %u to %u\n", start, end); |
a86c6181 AT |
2768 | |
2769 | /* probably first extent we're gonna free will be last in block */ | |
9924a92a | 2770 | handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, depth + 1); |
a86c6181 AT |
2771 | if (IS_ERR(handle)) |
2772 | return PTR_ERR(handle); | |
2773 | ||
0617b83f | 2774 | again: |
61801325 | 2775 | trace_ext4_ext_remove_space(inode, start, end, depth); |
d8990240 | 2776 | |
5f95d21f LC |
2777 | /* |
2778 | * Check if we are removing extents inside the extent tree. If that | |
2779 | * is the case, we are going to punch a hole inside the extent tree | |
2780 | * so we have to check whether we need to split the extent covering | |
2781 | * the last block to remove so we can easily remove the part of it | |
2782 | * in ext4_ext_rm_leaf(). | |
2783 | */ | |
2784 | if (end < EXT_MAX_BLOCKS - 1) { | |
2785 | struct ext4_extent *ex; | |
2786 | ext4_lblk_t ee_block; | |
2787 | ||
2788 | /* find extent for this block */ | |
107a7bd3 | 2789 | path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE); |
5f95d21f LC |
2790 | if (IS_ERR(path)) { |
2791 | ext4_journal_stop(handle); | |
2792 | return PTR_ERR(path); | |
2793 | } | |
2794 | depth = ext_depth(inode); | |
6f2080e6 | 2795 | /* Leaf not may not exist only if inode has no blocks at all */ |
5f95d21f | 2796 | ex = path[depth].p_ext; |
968dee77 | 2797 | if (!ex) { |
6f2080e6 DM |
2798 | if (depth) { |
2799 | EXT4_ERROR_INODE(inode, | |
2800 | "path[%d].p_hdr == NULL", | |
2801 | depth); | |
2802 | err = -EIO; | |
2803 | } | |
2804 | goto out; | |
968dee77 | 2805 | } |
5f95d21f LC |
2806 | |
2807 | ee_block = le32_to_cpu(ex->ee_block); | |
2808 | ||
2809 | /* | |
2810 | * See if the last block is inside the extent, if so split | |
2811 | * the extent at 'end' block so we can easily remove the | |
2812 | * tail of the first part of the split extent in | |
2813 | * ext4_ext_rm_leaf(). | |
2814 | */ | |
2815 | if (end >= ee_block && | |
2816 | end < ee_block + ext4_ext_get_actual_len(ex) - 1) { | |
2817 | int split_flag = 0; | |
2818 | ||
2819 | if (ext4_ext_is_uninitialized(ex)) | |
2820 | split_flag = EXT4_EXT_MARK_UNINIT1 | | |
2821 | EXT4_EXT_MARK_UNINIT2; | |
2822 | ||
2823 | /* | |
2824 | * Split the extent in two so that 'end' is the last | |
27dd4385 LC |
2825 | * block in the first new extent. Also we should not |
2826 | * fail removing space due to ENOSPC so try to use | |
2827 | * reserved block if that happens. | |
5f95d21f LC |
2828 | */ |
2829 | err = ext4_split_extent_at(handle, inode, path, | |
27dd4385 | 2830 | end + 1, split_flag, |
107a7bd3 | 2831 | EXT4_EX_NOCACHE | |
27dd4385 LC |
2832 | EXT4_GET_BLOCKS_PRE_IO | |
2833 | EXT4_GET_BLOCKS_METADATA_NOFAIL); | |
5f95d21f LC |
2834 | |
2835 | if (err < 0) | |
2836 | goto out; | |
2837 | } | |
5f95d21f | 2838 | } |
a86c6181 | 2839 | /* |
d0d856e8 RD |
2840 | * We start scanning from right side, freeing all the blocks |
2841 | * after i_size and walking into the tree depth-wise. | |
a86c6181 | 2842 | */ |
0617b83f | 2843 | depth = ext_depth(inode); |
968dee77 AS |
2844 | if (path) { |
2845 | int k = i = depth; | |
2846 | while (--k > 0) | |
2847 | path[k].p_block = | |
2848 | le16_to_cpu(path[k].p_hdr->eh_entries)+1; | |
2849 | } else { | |
2850 | path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), | |
2851 | GFP_NOFS); | |
2852 | if (path == NULL) { | |
2853 | ext4_journal_stop(handle); | |
2854 | return -ENOMEM; | |
2855 | } | |
2856 | path[0].p_depth = depth; | |
2857 | path[0].p_hdr = ext_inode_hdr(inode); | |
89a4e48f | 2858 | i = 0; |
5f95d21f | 2859 | |
c349179b | 2860 | if (ext4_ext_check(inode, path[0].p_hdr, depth, 0)) { |
968dee77 AS |
2861 | err = -EIO; |
2862 | goto out; | |
2863 | } | |
a86c6181 | 2864 | } |
968dee77 | 2865 | err = 0; |
a86c6181 AT |
2866 | |
2867 | while (i >= 0 && err == 0) { | |
2868 | if (i == depth) { | |
2869 | /* this is leaf block */ | |
d583fb87 | 2870 | err = ext4_ext_rm_leaf(handle, inode, path, |
0aa06000 | 2871 | &partial_cluster, start, |
5f95d21f | 2872 | end); |
d0d856e8 | 2873 | /* root level has p_bh == NULL, brelse() eats this */ |
a86c6181 AT |
2874 | brelse(path[i].p_bh); |
2875 | path[i].p_bh = NULL; | |
2876 | i--; | |
2877 | continue; | |
2878 | } | |
2879 | ||
2880 | /* this is index block */ | |
2881 | if (!path[i].p_hdr) { | |
2882 | ext_debug("initialize header\n"); | |
2883 | path[i].p_hdr = ext_block_hdr(path[i].p_bh); | |
a86c6181 AT |
2884 | } |
2885 | ||
a86c6181 | 2886 | if (!path[i].p_idx) { |
d0d856e8 | 2887 | /* this level hasn't been touched yet */ |
a86c6181 AT |
2888 | path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr); |
2889 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1; | |
2890 | ext_debug("init index ptr: hdr 0x%p, num %d\n", | |
2891 | path[i].p_hdr, | |
2892 | le16_to_cpu(path[i].p_hdr->eh_entries)); | |
2893 | } else { | |
d0d856e8 | 2894 | /* we were already here, see at next index */ |
a86c6181 AT |
2895 | path[i].p_idx--; |
2896 | } | |
2897 | ||
2898 | ext_debug("level %d - index, first 0x%p, cur 0x%p\n", | |
2899 | i, EXT_FIRST_INDEX(path[i].p_hdr), | |
2900 | path[i].p_idx); | |
2901 | if (ext4_ext_more_to_rm(path + i)) { | |
c29c0ae7 | 2902 | struct buffer_head *bh; |
a86c6181 | 2903 | /* go to the next level */ |
2ae02107 | 2904 | ext_debug("move to level %d (block %llu)\n", |
bf89d16f | 2905 | i + 1, ext4_idx_pblock(path[i].p_idx)); |
a86c6181 | 2906 | memset(path + i + 1, 0, sizeof(*path)); |
7d7ea89e | 2907 | bh = read_extent_tree_block(inode, |
107a7bd3 TT |
2908 | ext4_idx_pblock(path[i].p_idx), depth - i - 1, |
2909 | EXT4_EX_NOCACHE); | |
7d7ea89e | 2910 | if (IS_ERR(bh)) { |
a86c6181 | 2911 | /* should we reset i_size? */ |
7d7ea89e | 2912 | err = PTR_ERR(bh); |
a86c6181 AT |
2913 | break; |
2914 | } | |
76828c88 TT |
2915 | /* Yield here to deal with large extent trees. |
2916 | * Should be a no-op if we did IO above. */ | |
2917 | cond_resched(); | |
c29c0ae7 AT |
2918 | if (WARN_ON(i + 1 > depth)) { |
2919 | err = -EIO; | |
c29c0ae7 AT |
2920 | break; |
2921 | } | |
2922 | path[i + 1].p_bh = bh; | |
a86c6181 | 2923 | |
d0d856e8 RD |
2924 | /* save actual number of indexes since this |
2925 | * number is changed at the next iteration */ | |
a86c6181 AT |
2926 | path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries); |
2927 | i++; | |
2928 | } else { | |
d0d856e8 | 2929 | /* we finished processing this index, go up */ |
a86c6181 | 2930 | if (path[i].p_hdr->eh_entries == 0 && i > 0) { |
d0d856e8 | 2931 | /* index is empty, remove it; |
a86c6181 AT |
2932 | * handle must be already prepared by the |
2933 | * truncatei_leaf() */ | |
c36575e6 | 2934 | err = ext4_ext_rm_idx(handle, inode, path, i); |
a86c6181 | 2935 | } |
d0d856e8 | 2936 | /* root level has p_bh == NULL, brelse() eats this */ |
a86c6181 AT |
2937 | brelse(path[i].p_bh); |
2938 | path[i].p_bh = NULL; | |
2939 | i--; | |
2940 | ext_debug("return to level %d\n", i); | |
2941 | } | |
2942 | } | |
2943 | ||
61801325 LC |
2944 | trace_ext4_ext_remove_space_done(inode, start, end, depth, |
2945 | partial_cluster, path->p_hdr->eh_entries); | |
d8990240 | 2946 | |
7b415bf6 AK |
2947 | /* If we still have something in the partial cluster and we have removed |
2948 | * even the first extent, then we should free the blocks in the partial | |
2949 | * cluster as well. */ | |
d23142c6 | 2950 | if (partial_cluster > 0 && path->p_hdr->eh_entries == 0) { |
981250ca | 2951 | int flags = get_default_free_blocks_flags(inode); |
7b415bf6 AK |
2952 | |
2953 | ext4_free_blocks(handle, inode, NULL, | |
2954 | EXT4_C2B(EXT4_SB(sb), partial_cluster), | |
2955 | EXT4_SB(sb)->s_cluster_ratio, flags); | |
2956 | partial_cluster = 0; | |
2957 | } | |
2958 | ||
a86c6181 AT |
2959 | /* TODO: flexible tree reduction should be here */ |
2960 | if (path->p_hdr->eh_entries == 0) { | |
2961 | /* | |
d0d856e8 RD |
2962 | * truncate to zero freed all the tree, |
2963 | * so we need to correct eh_depth | |
a86c6181 AT |
2964 | */ |
2965 | err = ext4_ext_get_access(handle, inode, path); | |
2966 | if (err == 0) { | |
2967 | ext_inode_hdr(inode)->eh_depth = 0; | |
2968 | ext_inode_hdr(inode)->eh_max = | |
55ad63bf | 2969 | cpu_to_le16(ext4_ext_space_root(inode, 0)); |
a86c6181 AT |
2970 | err = ext4_ext_dirty(handle, inode, path); |
2971 | } | |
2972 | } | |
2973 | out: | |
a86c6181 AT |
2974 | ext4_ext_drop_refs(path); |
2975 | kfree(path); | |
968dee77 AS |
2976 | if (err == -EAGAIN) { |
2977 | path = NULL; | |
0617b83f | 2978 | goto again; |
968dee77 | 2979 | } |
a86c6181 AT |
2980 | ext4_journal_stop(handle); |
2981 | ||
2982 | return err; | |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * called at mount time | |
2987 | */ | |
2988 | void ext4_ext_init(struct super_block *sb) | |
2989 | { | |
2990 | /* | |
2991 | * possible initialization would be here | |
2992 | */ | |
2993 | ||
83982b6f | 2994 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
90576c0b | 2995 | #if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS) |
92b97816 | 2996 | printk(KERN_INFO "EXT4-fs: file extents enabled" |
bbf2f9fb | 2997 | #ifdef AGGRESSIVE_TEST |
92b97816 | 2998 | ", aggressive tests" |
a86c6181 AT |
2999 | #endif |
3000 | #ifdef CHECK_BINSEARCH | |
92b97816 | 3001 | ", check binsearch" |
a86c6181 AT |
3002 | #endif |
3003 | #ifdef EXTENTS_STATS | |
92b97816 | 3004 | ", stats" |
a86c6181 | 3005 | #endif |
92b97816 | 3006 | "\n"); |
90576c0b | 3007 | #endif |
a86c6181 AT |
3008 | #ifdef EXTENTS_STATS |
3009 | spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock); | |
3010 | EXT4_SB(sb)->s_ext_min = 1 << 30; | |
3011 | EXT4_SB(sb)->s_ext_max = 0; | |
3012 | #endif | |
3013 | } | |
3014 | } | |
3015 | ||
3016 | /* | |
3017 | * called at umount time | |
3018 | */ | |
3019 | void ext4_ext_release(struct super_block *sb) | |
3020 | { | |
83982b6f | 3021 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
a86c6181 AT |
3022 | return; |
3023 | ||
3024 | #ifdef EXTENTS_STATS | |
3025 | if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) { | |
3026 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
3027 | printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n", | |
3028 | sbi->s_ext_blocks, sbi->s_ext_extents, | |
3029 | sbi->s_ext_blocks / sbi->s_ext_extents); | |
3030 | printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n", | |
3031 | sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max); | |
3032 | } | |
3033 | #endif | |
3034 | } | |
3035 | ||
d7b2a00c ZL |
3036 | static int ext4_zeroout_es(struct inode *inode, struct ext4_extent *ex) |
3037 | { | |
3038 | ext4_lblk_t ee_block; | |
3039 | ext4_fsblk_t ee_pblock; | |
3040 | unsigned int ee_len; | |
3041 | ||
3042 | ee_block = le32_to_cpu(ex->ee_block); | |
3043 | ee_len = ext4_ext_get_actual_len(ex); | |
3044 | ee_pblock = ext4_ext_pblock(ex); | |
3045 | ||
3046 | if (ee_len == 0) | |
3047 | return 0; | |
3048 | ||
3049 | return ext4_es_insert_extent(inode, ee_block, ee_len, ee_pblock, | |
3050 | EXTENT_STATUS_WRITTEN); | |
3051 | } | |
3052 | ||
093a088b AK |
3053 | /* FIXME!! we need to try to merge to left or right after zero-out */ |
3054 | static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex) | |
3055 | { | |
2407518d LC |
3056 | ext4_fsblk_t ee_pblock; |
3057 | unsigned int ee_len; | |
b720303d | 3058 | int ret; |
093a088b | 3059 | |
093a088b | 3060 | ee_len = ext4_ext_get_actual_len(ex); |
bf89d16f | 3061 | ee_pblock = ext4_ext_pblock(ex); |
b720303d | 3062 | |
a107e5a3 | 3063 | ret = sb_issue_zeroout(inode->i_sb, ee_pblock, ee_len, GFP_NOFS); |
2407518d LC |
3064 | if (ret > 0) |
3065 | ret = 0; | |
093a088b | 3066 | |
2407518d | 3067 | return ret; |
093a088b AK |
3068 | } |
3069 | ||
47ea3bb5 YY |
3070 | /* |
3071 | * ext4_split_extent_at() splits an extent at given block. | |
3072 | * | |
3073 | * @handle: the journal handle | |
3074 | * @inode: the file inode | |
3075 | * @path: the path to the extent | |
3076 | * @split: the logical block where the extent is splitted. | |
3077 | * @split_flags: indicates if the extent could be zeroout if split fails, and | |
3078 | * the states(init or uninit) of new extents. | |
3079 | * @flags: flags used to insert new extent to extent tree. | |
3080 | * | |
3081 | * | |
3082 | * Splits extent [a, b] into two extents [a, @split) and [@split, b], states | |
3083 | * of which are deterimined by split_flag. | |
3084 | * | |
3085 | * There are two cases: | |
3086 | * a> the extent are splitted into two extent. | |
3087 | * b> split is not needed, and just mark the extent. | |
3088 | * | |
3089 | * return 0 on success. | |
3090 | */ | |
3091 | static int ext4_split_extent_at(handle_t *handle, | |
3092 | struct inode *inode, | |
3093 | struct ext4_ext_path *path, | |
3094 | ext4_lblk_t split, | |
3095 | int split_flag, | |
3096 | int flags) | |
3097 | { | |
3098 | ext4_fsblk_t newblock; | |
3099 | ext4_lblk_t ee_block; | |
adb23551 | 3100 | struct ext4_extent *ex, newex, orig_ex, zero_ex; |
47ea3bb5 YY |
3101 | struct ext4_extent *ex2 = NULL; |
3102 | unsigned int ee_len, depth; | |
3103 | int err = 0; | |
3104 | ||
dee1f973 DM |
3105 | BUG_ON((split_flag & (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)) == |
3106 | (EXT4_EXT_DATA_VALID1 | EXT4_EXT_DATA_VALID2)); | |
3107 | ||
47ea3bb5 YY |
3108 | ext_debug("ext4_split_extents_at: inode %lu, logical" |
3109 | "block %llu\n", inode->i_ino, (unsigned long long)split); | |
3110 | ||
3111 | ext4_ext_show_leaf(inode, path); | |
3112 | ||
3113 | depth = ext_depth(inode); | |
3114 | ex = path[depth].p_ext; | |
3115 | ee_block = le32_to_cpu(ex->ee_block); | |
3116 | ee_len = ext4_ext_get_actual_len(ex); | |
3117 | newblock = split - ee_block + ext4_ext_pblock(ex); | |
3118 | ||
3119 | BUG_ON(split < ee_block || split >= (ee_block + ee_len)); | |
357b66fd DM |
3120 | BUG_ON(!ext4_ext_is_uninitialized(ex) && |
3121 | split_flag & (EXT4_EXT_MAY_ZEROOUT | | |
3122 | EXT4_EXT_MARK_UNINIT1 | | |
3123 | EXT4_EXT_MARK_UNINIT2)); | |
47ea3bb5 YY |
3124 | |
3125 | err = ext4_ext_get_access(handle, inode, path + depth); | |
3126 | if (err) | |
3127 | goto out; | |
3128 | ||
3129 | if (split == ee_block) { | |
3130 | /* | |
3131 | * case b: block @split is the block that the extent begins with | |
3132 | * then we just change the state of the extent, and splitting | |
3133 | * is not needed. | |
3134 | */ | |
3135 | if (split_flag & EXT4_EXT_MARK_UNINIT2) | |
3136 | ext4_ext_mark_uninitialized(ex); | |
3137 | else | |
3138 | ext4_ext_mark_initialized(ex); | |
3139 | ||
3140 | if (!(flags & EXT4_GET_BLOCKS_PRE_IO)) | |
ecb94f5f | 3141 | ext4_ext_try_to_merge(handle, inode, path, ex); |
47ea3bb5 | 3142 | |
ecb94f5f | 3143 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
47ea3bb5 YY |
3144 | goto out; |
3145 | } | |
3146 | ||
3147 | /* case a */ | |
3148 | memcpy(&orig_ex, ex, sizeof(orig_ex)); | |
3149 | ex->ee_len = cpu_to_le16(split - ee_block); | |
3150 | if (split_flag & EXT4_EXT_MARK_UNINIT1) | |
3151 | ext4_ext_mark_uninitialized(ex); | |
3152 | ||
3153 | /* | |
3154 | * path may lead to new leaf, not to original leaf any more | |
3155 | * after ext4_ext_insert_extent() returns, | |
3156 | */ | |
3157 | err = ext4_ext_dirty(handle, inode, path + depth); | |
3158 | if (err) | |
3159 | goto fix_extent_len; | |
3160 | ||
3161 | ex2 = &newex; | |
3162 | ex2->ee_block = cpu_to_le32(split); | |
3163 | ex2->ee_len = cpu_to_le16(ee_len - (split - ee_block)); | |
3164 | ext4_ext_store_pblock(ex2, newblock); | |
3165 | if (split_flag & EXT4_EXT_MARK_UNINIT2) | |
3166 | ext4_ext_mark_uninitialized(ex2); | |
3167 | ||
3168 | err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); | |
3169 | if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) { | |
dee1f973 | 3170 | if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) { |
adb23551 | 3171 | if (split_flag & EXT4_EXT_DATA_VALID1) { |
dee1f973 | 3172 | err = ext4_ext_zeroout(inode, ex2); |
adb23551 | 3173 | zero_ex.ee_block = ex2->ee_block; |
8cde7ad1 ZL |
3174 | zero_ex.ee_len = cpu_to_le16( |
3175 | ext4_ext_get_actual_len(ex2)); | |
adb23551 ZL |
3176 | ext4_ext_store_pblock(&zero_ex, |
3177 | ext4_ext_pblock(ex2)); | |
3178 | } else { | |
dee1f973 | 3179 | err = ext4_ext_zeroout(inode, ex); |
adb23551 | 3180 | zero_ex.ee_block = ex->ee_block; |
8cde7ad1 ZL |
3181 | zero_ex.ee_len = cpu_to_le16( |
3182 | ext4_ext_get_actual_len(ex)); | |
adb23551 ZL |
3183 | ext4_ext_store_pblock(&zero_ex, |
3184 | ext4_ext_pblock(ex)); | |
3185 | } | |
3186 | } else { | |
dee1f973 | 3187 | err = ext4_ext_zeroout(inode, &orig_ex); |
adb23551 | 3188 | zero_ex.ee_block = orig_ex.ee_block; |
8cde7ad1 ZL |
3189 | zero_ex.ee_len = cpu_to_le16( |
3190 | ext4_ext_get_actual_len(&orig_ex)); | |
adb23551 ZL |
3191 | ext4_ext_store_pblock(&zero_ex, |
3192 | ext4_ext_pblock(&orig_ex)); | |
3193 | } | |
dee1f973 | 3194 | |
47ea3bb5 YY |
3195 | if (err) |
3196 | goto fix_extent_len; | |
3197 | /* update the extent length and mark as initialized */ | |
af1584f5 | 3198 | ex->ee_len = cpu_to_le16(ee_len); |
ecb94f5f TT |
3199 | ext4_ext_try_to_merge(handle, inode, path, ex); |
3200 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); | |
adb23551 ZL |
3201 | if (err) |
3202 | goto fix_extent_len; | |
3203 | ||
3204 | /* update extent status tree */ | |
d7b2a00c | 3205 | err = ext4_zeroout_es(inode, &zero_ex); |
adb23551 | 3206 | |
47ea3bb5 YY |
3207 | goto out; |
3208 | } else if (err) | |
3209 | goto fix_extent_len; | |
3210 | ||
3211 | out: | |
3212 | ext4_ext_show_leaf(inode, path); | |
3213 | return err; | |
3214 | ||
3215 | fix_extent_len: | |
3216 | ex->ee_len = orig_ex.ee_len; | |
3217 | ext4_ext_dirty(handle, inode, path + depth); | |
3218 | return err; | |
3219 | } | |
3220 | ||
3221 | /* | |
3222 | * ext4_split_extents() splits an extent and mark extent which is covered | |
3223 | * by @map as split_flags indicates | |
3224 | * | |
70261f56 | 3225 | * It may result in splitting the extent into multiple extents (up to three) |
47ea3bb5 YY |
3226 | * There are three possibilities: |
3227 | * a> There is no split required | |
3228 | * b> Splits in two extents: Split is happening at either end of the extent | |
3229 | * c> Splits in three extents: Somone is splitting in middle of the extent | |
3230 | * | |
3231 | */ | |
3232 | static int ext4_split_extent(handle_t *handle, | |
3233 | struct inode *inode, | |
3234 | struct ext4_ext_path *path, | |
3235 | struct ext4_map_blocks *map, | |
3236 | int split_flag, | |
3237 | int flags) | |
3238 | { | |
3239 | ext4_lblk_t ee_block; | |
3240 | struct ext4_extent *ex; | |
3241 | unsigned int ee_len, depth; | |
3242 | int err = 0; | |
3243 | int uninitialized; | |
3244 | int split_flag1, flags1; | |
3a225670 | 3245 | int allocated = map->m_len; |
47ea3bb5 YY |
3246 | |
3247 | depth = ext_depth(inode); | |
3248 | ex = path[depth].p_ext; | |
3249 | ee_block = le32_to_cpu(ex->ee_block); | |
3250 | ee_len = ext4_ext_get_actual_len(ex); | |
3251 | uninitialized = ext4_ext_is_uninitialized(ex); | |
3252 | ||
3253 | if (map->m_lblk + map->m_len < ee_block + ee_len) { | |
dee1f973 | 3254 | split_flag1 = split_flag & EXT4_EXT_MAY_ZEROOUT; |
47ea3bb5 YY |
3255 | flags1 = flags | EXT4_GET_BLOCKS_PRE_IO; |
3256 | if (uninitialized) | |
3257 | split_flag1 |= EXT4_EXT_MARK_UNINIT1 | | |
3258 | EXT4_EXT_MARK_UNINIT2; | |
dee1f973 DM |
3259 | if (split_flag & EXT4_EXT_DATA_VALID2) |
3260 | split_flag1 |= EXT4_EXT_DATA_VALID1; | |
47ea3bb5 YY |
3261 | err = ext4_split_extent_at(handle, inode, path, |
3262 | map->m_lblk + map->m_len, split_flag1, flags1); | |
93917411 YY |
3263 | if (err) |
3264 | goto out; | |
3a225670 ZL |
3265 | } else { |
3266 | allocated = ee_len - (map->m_lblk - ee_block); | |
47ea3bb5 | 3267 | } |
357b66fd DM |
3268 | /* |
3269 | * Update path is required because previous ext4_split_extent_at() may | |
3270 | * result in split of original leaf or extent zeroout. | |
3271 | */ | |
47ea3bb5 | 3272 | ext4_ext_drop_refs(path); |
107a7bd3 | 3273 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
47ea3bb5 YY |
3274 | if (IS_ERR(path)) |
3275 | return PTR_ERR(path); | |
357b66fd DM |
3276 | depth = ext_depth(inode); |
3277 | ex = path[depth].p_ext; | |
3278 | uninitialized = ext4_ext_is_uninitialized(ex); | |
3279 | split_flag1 = 0; | |
47ea3bb5 YY |
3280 | |
3281 | if (map->m_lblk >= ee_block) { | |
357b66fd DM |
3282 | split_flag1 = split_flag & EXT4_EXT_DATA_VALID2; |
3283 | if (uninitialized) { | |
47ea3bb5 | 3284 | split_flag1 |= EXT4_EXT_MARK_UNINIT1; |
357b66fd DM |
3285 | split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT | |
3286 | EXT4_EXT_MARK_UNINIT2); | |
3287 | } | |
47ea3bb5 YY |
3288 | err = ext4_split_extent_at(handle, inode, path, |
3289 | map->m_lblk, split_flag1, flags); | |
3290 | if (err) | |
3291 | goto out; | |
3292 | } | |
3293 | ||
3294 | ext4_ext_show_leaf(inode, path); | |
3295 | out: | |
3a225670 | 3296 | return err ? err : allocated; |
47ea3bb5 YY |
3297 | } |
3298 | ||
56055d3a | 3299 | /* |
e35fd660 | 3300 | * This function is called by ext4_ext_map_blocks() if someone tries to write |
56055d3a | 3301 | * to an uninitialized extent. It may result in splitting the uninitialized |
25985edc | 3302 | * extent into multiple extents (up to three - one initialized and two |
56055d3a AA |
3303 | * uninitialized). |
3304 | * There are three possibilities: | |
3305 | * a> There is no split required: Entire extent should be initialized | |
3306 | * b> Splits in two extents: Write is happening at either end of the extent | |
3307 | * c> Splits in three extents: Somone is writing in middle of the extent | |
6f91bc5f EG |
3308 | * |
3309 | * Pre-conditions: | |
3310 | * - The extent pointed to by 'path' is uninitialized. | |
3311 | * - The extent pointed to by 'path' contains a superset | |
3312 | * of the logical span [map->m_lblk, map->m_lblk + map->m_len). | |
3313 | * | |
3314 | * Post-conditions on success: | |
3315 | * - the returned value is the number of blocks beyond map->l_lblk | |
3316 | * that are allocated and initialized. | |
3317 | * It is guaranteed to be >= map->m_len. | |
56055d3a | 3318 | */ |
725d26d3 | 3319 | static int ext4_ext_convert_to_initialized(handle_t *handle, |
e35fd660 TT |
3320 | struct inode *inode, |
3321 | struct ext4_map_blocks *map, | |
27dd4385 LC |
3322 | struct ext4_ext_path *path, |
3323 | int flags) | |
56055d3a | 3324 | { |
67a5da56 | 3325 | struct ext4_sb_info *sbi; |
6f91bc5f | 3326 | struct ext4_extent_header *eh; |
667eff35 YY |
3327 | struct ext4_map_blocks split_map; |
3328 | struct ext4_extent zero_ex; | |
bc2d9db4 | 3329 | struct ext4_extent *ex, *abut_ex; |
21ca087a | 3330 | ext4_lblk_t ee_block, eof_block; |
bc2d9db4 LC |
3331 | unsigned int ee_len, depth, map_len = map->m_len; |
3332 | int allocated = 0, max_zeroout = 0; | |
56055d3a | 3333 | int err = 0; |
667eff35 | 3334 | int split_flag = 0; |
21ca087a DM |
3335 | |
3336 | ext_debug("ext4_ext_convert_to_initialized: inode %lu, logical" | |
3337 | "block %llu, max_blocks %u\n", inode->i_ino, | |
bc2d9db4 | 3338 | (unsigned long long)map->m_lblk, map_len); |
21ca087a | 3339 | |
67a5da56 | 3340 | sbi = EXT4_SB(inode->i_sb); |
21ca087a DM |
3341 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> |
3342 | inode->i_sb->s_blocksize_bits; | |
bc2d9db4 LC |
3343 | if (eof_block < map->m_lblk + map_len) |
3344 | eof_block = map->m_lblk + map_len; | |
56055d3a AA |
3345 | |
3346 | depth = ext_depth(inode); | |
6f91bc5f | 3347 | eh = path[depth].p_hdr; |
56055d3a AA |
3348 | ex = path[depth].p_ext; |
3349 | ee_block = le32_to_cpu(ex->ee_block); | |
3350 | ee_len = ext4_ext_get_actual_len(ex); | |
adb23551 | 3351 | zero_ex.ee_len = 0; |
56055d3a | 3352 | |
6f91bc5f EG |
3353 | trace_ext4_ext_convert_to_initialized_enter(inode, map, ex); |
3354 | ||
3355 | /* Pre-conditions */ | |
3356 | BUG_ON(!ext4_ext_is_uninitialized(ex)); | |
3357 | BUG_ON(!in_range(map->m_lblk, ee_block, ee_len)); | |
6f91bc5f EG |
3358 | |
3359 | /* | |
3360 | * Attempt to transfer newly initialized blocks from the currently | |
bc2d9db4 | 3361 | * uninitialized extent to its neighbor. This is much cheaper |
6f91bc5f | 3362 | * than an insertion followed by a merge as those involve costly |
bc2d9db4 LC |
3363 | * memmove() calls. Transferring to the left is the common case in |
3364 | * steady state for workloads doing fallocate(FALLOC_FL_KEEP_SIZE) | |
3365 | * followed by append writes. | |
6f91bc5f EG |
3366 | * |
3367 | * Limitations of the current logic: | |
bc2d9db4 | 3368 | * - L1: we do not deal with writes covering the whole extent. |
6f91bc5f EG |
3369 | * This would require removing the extent if the transfer |
3370 | * is possible. | |
bc2d9db4 | 3371 | * - L2: we only attempt to merge with an extent stored in the |
6f91bc5f EG |
3372 | * same extent tree node. |
3373 | */ | |
bc2d9db4 LC |
3374 | if ((map->m_lblk == ee_block) && |
3375 | /* See if we can merge left */ | |
3376 | (map_len < ee_len) && /*L1*/ | |
3377 | (ex > EXT_FIRST_EXTENT(eh))) { /*L2*/ | |
6f91bc5f EG |
3378 | ext4_lblk_t prev_lblk; |
3379 | ext4_fsblk_t prev_pblk, ee_pblk; | |
bc2d9db4 | 3380 | unsigned int prev_len; |
6f91bc5f | 3381 | |
bc2d9db4 LC |
3382 | abut_ex = ex - 1; |
3383 | prev_lblk = le32_to_cpu(abut_ex->ee_block); | |
3384 | prev_len = ext4_ext_get_actual_len(abut_ex); | |
3385 | prev_pblk = ext4_ext_pblock(abut_ex); | |
6f91bc5f | 3386 | ee_pblk = ext4_ext_pblock(ex); |
6f91bc5f EG |
3387 | |
3388 | /* | |
bc2d9db4 | 3389 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed |
6f91bc5f | 3390 | * upon those conditions: |
bc2d9db4 LC |
3391 | * - C1: abut_ex is initialized, |
3392 | * - C2: abut_ex is logically abutting ex, | |
3393 | * - C3: abut_ex is physically abutting ex, | |
3394 | * - C4: abut_ex can receive the additional blocks without | |
6f91bc5f EG |
3395 | * overflowing the (initialized) length limit. |
3396 | */ | |
bc2d9db4 | 3397 | if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/ |
6f91bc5f EG |
3398 | ((prev_lblk + prev_len) == ee_block) && /*C2*/ |
3399 | ((prev_pblk + prev_len) == ee_pblk) && /*C3*/ | |
bc2d9db4 | 3400 | (prev_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ |
6f91bc5f EG |
3401 | err = ext4_ext_get_access(handle, inode, path + depth); |
3402 | if (err) | |
3403 | goto out; | |
3404 | ||
3405 | trace_ext4_ext_convert_to_initialized_fastpath(inode, | |
bc2d9db4 | 3406 | map, ex, abut_ex); |
6f91bc5f | 3407 | |
bc2d9db4 LC |
3408 | /* Shift the start of ex by 'map_len' blocks */ |
3409 | ex->ee_block = cpu_to_le32(ee_block + map_len); | |
3410 | ext4_ext_store_pblock(ex, ee_pblk + map_len); | |
3411 | ex->ee_len = cpu_to_le16(ee_len - map_len); | |
6f91bc5f EG |
3412 | ext4_ext_mark_uninitialized(ex); /* Restore the flag */ |
3413 | ||
bc2d9db4 LC |
3414 | /* Extend abut_ex by 'map_len' blocks */ |
3415 | abut_ex->ee_len = cpu_to_le16(prev_len + map_len); | |
6f91bc5f | 3416 | |
bc2d9db4 LC |
3417 | /* Result: number of initialized blocks past m_lblk */ |
3418 | allocated = map_len; | |
3419 | } | |
3420 | } else if (((map->m_lblk + map_len) == (ee_block + ee_len)) && | |
3421 | (map_len < ee_len) && /*L1*/ | |
3422 | ex < EXT_LAST_EXTENT(eh)) { /*L2*/ | |
3423 | /* See if we can merge right */ | |
3424 | ext4_lblk_t next_lblk; | |
3425 | ext4_fsblk_t next_pblk, ee_pblk; | |
3426 | unsigned int next_len; | |
3427 | ||
3428 | abut_ex = ex + 1; | |
3429 | next_lblk = le32_to_cpu(abut_ex->ee_block); | |
3430 | next_len = ext4_ext_get_actual_len(abut_ex); | |
3431 | next_pblk = ext4_ext_pblock(abut_ex); | |
3432 | ee_pblk = ext4_ext_pblock(ex); | |
6f91bc5f | 3433 | |
bc2d9db4 LC |
3434 | /* |
3435 | * A transfer of blocks from 'ex' to 'abut_ex' is allowed | |
3436 | * upon those conditions: | |
3437 | * - C1: abut_ex is initialized, | |
3438 | * - C2: abut_ex is logically abutting ex, | |
3439 | * - C3: abut_ex is physically abutting ex, | |
3440 | * - C4: abut_ex can receive the additional blocks without | |
3441 | * overflowing the (initialized) length limit. | |
3442 | */ | |
3443 | if ((!ext4_ext_is_uninitialized(abut_ex)) && /*C1*/ | |
3444 | ((map->m_lblk + map_len) == next_lblk) && /*C2*/ | |
3445 | ((ee_pblk + ee_len) == next_pblk) && /*C3*/ | |
3446 | (next_len < (EXT_INIT_MAX_LEN - map_len))) { /*C4*/ | |
3447 | err = ext4_ext_get_access(handle, inode, path + depth); | |
3448 | if (err) | |
3449 | goto out; | |
3450 | ||
3451 | trace_ext4_ext_convert_to_initialized_fastpath(inode, | |
3452 | map, ex, abut_ex); | |
3453 | ||
3454 | /* Shift the start of abut_ex by 'map_len' blocks */ | |
3455 | abut_ex->ee_block = cpu_to_le32(next_lblk - map_len); | |
3456 | ext4_ext_store_pblock(abut_ex, next_pblk - map_len); | |
3457 | ex->ee_len = cpu_to_le16(ee_len - map_len); | |
3458 | ext4_ext_mark_uninitialized(ex); /* Restore the flag */ | |
3459 | ||
3460 | /* Extend abut_ex by 'map_len' blocks */ | |
3461 | abut_ex->ee_len = cpu_to_le16(next_len + map_len); | |
6f91bc5f EG |
3462 | |
3463 | /* Result: number of initialized blocks past m_lblk */ | |
bc2d9db4 | 3464 | allocated = map_len; |
6f91bc5f EG |
3465 | } |
3466 | } | |
bc2d9db4 LC |
3467 | if (allocated) { |
3468 | /* Mark the block containing both extents as dirty */ | |
3469 | ext4_ext_dirty(handle, inode, path + depth); | |
3470 | ||
3471 | /* Update path to point to the right extent */ | |
3472 | path[depth].p_ext = abut_ex; | |
3473 | goto out; | |
3474 | } else | |
3475 | allocated = ee_len - (map->m_lblk - ee_block); | |
6f91bc5f | 3476 | |
667eff35 | 3477 | WARN_ON(map->m_lblk < ee_block); |
21ca087a DM |
3478 | /* |
3479 | * It is safe to convert extent to initialized via explicit | |
9e740568 | 3480 | * zeroout only if extent is fully inside i_size or new_size. |
21ca087a | 3481 | */ |
667eff35 | 3482 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
21ca087a | 3483 | |
67a5da56 ZL |
3484 | if (EXT4_EXT_MAY_ZEROOUT & split_flag) |
3485 | max_zeroout = sbi->s_extent_max_zeroout_kb >> | |
4f42f80a | 3486 | (inode->i_sb->s_blocksize_bits - 10); |
67a5da56 ZL |
3487 | |
3488 | /* If extent is less than s_max_zeroout_kb, zeroout directly */ | |
3489 | if (max_zeroout && (ee_len <= max_zeroout)) { | |
667eff35 | 3490 | err = ext4_ext_zeroout(inode, ex); |
3977c965 | 3491 | if (err) |
d03856bd | 3492 | goto out; |
adb23551 | 3493 | zero_ex.ee_block = ex->ee_block; |
8cde7ad1 | 3494 | zero_ex.ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)); |
adb23551 | 3495 | ext4_ext_store_pblock(&zero_ex, ext4_ext_pblock(ex)); |
d03856bd AK |
3496 | |
3497 | err = ext4_ext_get_access(handle, inode, path + depth); | |
3498 | if (err) | |
3499 | goto out; | |
667eff35 | 3500 | ext4_ext_mark_initialized(ex); |
ecb94f5f TT |
3501 | ext4_ext_try_to_merge(handle, inode, path, ex); |
3502 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); | |
667eff35 | 3503 | goto out; |
56055d3a | 3504 | } |
667eff35 | 3505 | |
56055d3a | 3506 | /* |
667eff35 YY |
3507 | * four cases: |
3508 | * 1. split the extent into three extents. | |
3509 | * 2. split the extent into two extents, zeroout the first half. | |
3510 | * 3. split the extent into two extents, zeroout the second half. | |
3511 | * 4. split the extent into two extents with out zeroout. | |
56055d3a | 3512 | */ |
667eff35 YY |
3513 | split_map.m_lblk = map->m_lblk; |
3514 | split_map.m_len = map->m_len; | |
3515 | ||
67a5da56 ZL |
3516 | if (max_zeroout && (allocated > map->m_len)) { |
3517 | if (allocated <= max_zeroout) { | |
667eff35 YY |
3518 | /* case 3 */ |
3519 | zero_ex.ee_block = | |
9b940f8e AH |
3520 | cpu_to_le32(map->m_lblk); |
3521 | zero_ex.ee_len = cpu_to_le16(allocated); | |
667eff35 YY |
3522 | ext4_ext_store_pblock(&zero_ex, |
3523 | ext4_ext_pblock(ex) + map->m_lblk - ee_block); | |
3524 | err = ext4_ext_zeroout(inode, &zero_ex); | |
56055d3a AA |
3525 | if (err) |
3526 | goto out; | |
667eff35 YY |
3527 | split_map.m_lblk = map->m_lblk; |
3528 | split_map.m_len = allocated; | |
67a5da56 | 3529 | } else if (map->m_lblk - ee_block + map->m_len < max_zeroout) { |
667eff35 YY |
3530 | /* case 2 */ |
3531 | if (map->m_lblk != ee_block) { | |
3532 | zero_ex.ee_block = ex->ee_block; | |
3533 | zero_ex.ee_len = cpu_to_le16(map->m_lblk - | |
3534 | ee_block); | |
3535 | ext4_ext_store_pblock(&zero_ex, | |
3536 | ext4_ext_pblock(ex)); | |
3537 | err = ext4_ext_zeroout(inode, &zero_ex); | |
3538 | if (err) | |
3539 | goto out; | |
3540 | } | |
3541 | ||
667eff35 | 3542 | split_map.m_lblk = ee_block; |
9b940f8e AH |
3543 | split_map.m_len = map->m_lblk - ee_block + map->m_len; |
3544 | allocated = map->m_len; | |
56055d3a AA |
3545 | } |
3546 | } | |
667eff35 YY |
3547 | |
3548 | allocated = ext4_split_extent(handle, inode, path, | |
27dd4385 | 3549 | &split_map, split_flag, flags); |
667eff35 YY |
3550 | if (allocated < 0) |
3551 | err = allocated; | |
3552 | ||
56055d3a | 3553 | out: |
adb23551 ZL |
3554 | /* If we have gotten a failure, don't zero out status tree */ |
3555 | if (!err) | |
d7b2a00c | 3556 | err = ext4_zeroout_es(inode, &zero_ex); |
56055d3a AA |
3557 | return err ? err : allocated; |
3558 | } | |
3559 | ||
0031462b | 3560 | /* |
e35fd660 | 3561 | * This function is called by ext4_ext_map_blocks() from |
0031462b MC |
3562 | * ext4_get_blocks_dio_write() when DIO to write |
3563 | * to an uninitialized extent. | |
3564 | * | |
fd018fe8 | 3565 | * Writing to an uninitialized extent may result in splitting the uninitialized |
30cb27d6 | 3566 | * extent into multiple initialized/uninitialized extents (up to three) |
0031462b MC |
3567 | * There are three possibilities: |
3568 | * a> There is no split required: Entire extent should be uninitialized | |
3569 | * b> Splits in two extents: Write is happening at either end of the extent | |
3570 | * c> Splits in three extents: Somone is writing in middle of the extent | |
3571 | * | |
3572 | * One of more index blocks maybe needed if the extent tree grow after | |
b595076a | 3573 | * the uninitialized extent split. To prevent ENOSPC occur at the IO |
0031462b | 3574 | * complete, we need to split the uninitialized extent before DIO submit |
421f91d2 | 3575 | * the IO. The uninitialized extent called at this time will be split |
0031462b MC |
3576 | * into three uninitialized extent(at most). After IO complete, the part |
3577 | * being filled will be convert to initialized by the end_io callback function | |
3578 | * via ext4_convert_unwritten_extents(). | |
ba230c3f M |
3579 | * |
3580 | * Returns the size of uninitialized extent to be written on success. | |
0031462b MC |
3581 | */ |
3582 | static int ext4_split_unwritten_extents(handle_t *handle, | |
3583 | struct inode *inode, | |
e35fd660 | 3584 | struct ext4_map_blocks *map, |
0031462b | 3585 | struct ext4_ext_path *path, |
0031462b MC |
3586 | int flags) |
3587 | { | |
667eff35 YY |
3588 | ext4_lblk_t eof_block; |
3589 | ext4_lblk_t ee_block; | |
3590 | struct ext4_extent *ex; | |
3591 | unsigned int ee_len; | |
3592 | int split_flag = 0, depth; | |
21ca087a DM |
3593 | |
3594 | ext_debug("ext4_split_unwritten_extents: inode %lu, logical" | |
3595 | "block %llu, max_blocks %u\n", inode->i_ino, | |
e35fd660 | 3596 | (unsigned long long)map->m_lblk, map->m_len); |
21ca087a DM |
3597 | |
3598 | eof_block = (inode->i_size + inode->i_sb->s_blocksize - 1) >> | |
3599 | inode->i_sb->s_blocksize_bits; | |
e35fd660 TT |
3600 | if (eof_block < map->m_lblk + map->m_len) |
3601 | eof_block = map->m_lblk + map->m_len; | |
21ca087a DM |
3602 | /* |
3603 | * It is safe to convert extent to initialized via explicit | |
3604 | * zeroout only if extent is fully insde i_size or new_size. | |
3605 | */ | |
667eff35 YY |
3606 | depth = ext_depth(inode); |
3607 | ex = path[depth].p_ext; | |
3608 | ee_block = le32_to_cpu(ex->ee_block); | |
3609 | ee_len = ext4_ext_get_actual_len(ex); | |
0031462b | 3610 | |
667eff35 YY |
3611 | split_flag |= ee_block + ee_len <= eof_block ? EXT4_EXT_MAY_ZEROOUT : 0; |
3612 | split_flag |= EXT4_EXT_MARK_UNINIT2; | |
dee1f973 DM |
3613 | if (flags & EXT4_GET_BLOCKS_CONVERT) |
3614 | split_flag |= EXT4_EXT_DATA_VALID2; | |
667eff35 YY |
3615 | flags |= EXT4_GET_BLOCKS_PRE_IO; |
3616 | return ext4_split_extent(handle, inode, path, map, split_flag, flags); | |
0031462b | 3617 | } |
197217a5 | 3618 | |
c7064ef1 | 3619 | static int ext4_convert_unwritten_extents_endio(handle_t *handle, |
dee1f973 DM |
3620 | struct inode *inode, |
3621 | struct ext4_map_blocks *map, | |
3622 | struct ext4_ext_path *path) | |
0031462b MC |
3623 | { |
3624 | struct ext4_extent *ex; | |
dee1f973 DM |
3625 | ext4_lblk_t ee_block; |
3626 | unsigned int ee_len; | |
0031462b MC |
3627 | int depth; |
3628 | int err = 0; | |
0031462b MC |
3629 | |
3630 | depth = ext_depth(inode); | |
0031462b | 3631 | ex = path[depth].p_ext; |
dee1f973 DM |
3632 | ee_block = le32_to_cpu(ex->ee_block); |
3633 | ee_len = ext4_ext_get_actual_len(ex); | |
0031462b | 3634 | |
197217a5 YY |
3635 | ext_debug("ext4_convert_unwritten_extents_endio: inode %lu, logical" |
3636 | "block %llu, max_blocks %u\n", inode->i_ino, | |
dee1f973 DM |
3637 | (unsigned long long)ee_block, ee_len); |
3638 | ||
ff95ec22 DM |
3639 | /* If extent is larger than requested it is a clear sign that we still |
3640 | * have some extent state machine issues left. So extent_split is still | |
3641 | * required. | |
3642 | * TODO: Once all related issues will be fixed this situation should be | |
3643 | * illegal. | |
3644 | */ | |
dee1f973 | 3645 | if (ee_block != map->m_lblk || ee_len > map->m_len) { |
ff95ec22 DM |
3646 | #ifdef EXT4_DEBUG |
3647 | ext4_warning("Inode (%ld) finished: extent logical block %llu," | |
3648 | " len %u; IO logical block %llu, len %u\n", | |
3649 | inode->i_ino, (unsigned long long)ee_block, ee_len, | |
3650 | (unsigned long long)map->m_lblk, map->m_len); | |
3651 | #endif | |
dee1f973 DM |
3652 | err = ext4_split_unwritten_extents(handle, inode, map, path, |
3653 | EXT4_GET_BLOCKS_CONVERT); | |
3654 | if (err < 0) | |
3655 | goto out; | |
3656 | ext4_ext_drop_refs(path); | |
107a7bd3 | 3657 | path = ext4_ext_find_extent(inode, map->m_lblk, path, 0); |
dee1f973 DM |
3658 | if (IS_ERR(path)) { |
3659 | err = PTR_ERR(path); | |
3660 | goto out; | |
3661 | } | |
3662 | depth = ext_depth(inode); | |
3663 | ex = path[depth].p_ext; | |
3664 | } | |
197217a5 | 3665 | |
0031462b MC |
3666 | err = ext4_ext_get_access(handle, inode, path + depth); |
3667 | if (err) | |
3668 | goto out; | |
3669 | /* first mark the extent as initialized */ | |
3670 | ext4_ext_mark_initialized(ex); | |
3671 | ||
197217a5 YY |
3672 | /* note: ext4_ext_correct_indexes() isn't needed here because |
3673 | * borders are not changed | |
0031462b | 3674 | */ |
ecb94f5f | 3675 | ext4_ext_try_to_merge(handle, inode, path, ex); |
197217a5 | 3676 | |
0031462b | 3677 | /* Mark modified extent as dirty */ |
ecb94f5f | 3678 | err = ext4_ext_dirty(handle, inode, path + path->p_depth); |
0031462b MC |
3679 | out: |
3680 | ext4_ext_show_leaf(inode, path); | |
3681 | return err; | |
3682 | } | |
3683 | ||
515f41c3 AK |
3684 | static void unmap_underlying_metadata_blocks(struct block_device *bdev, |
3685 | sector_t block, int count) | |
3686 | { | |
3687 | int i; | |
3688 | for (i = 0; i < count; i++) | |
3689 | unmap_underlying_metadata(bdev, block + i); | |
3690 | } | |
3691 | ||
58590b06 TT |
3692 | /* |
3693 | * Handle EOFBLOCKS_FL flag, clearing it if necessary | |
3694 | */ | |
3695 | static int check_eofblocks_fl(handle_t *handle, struct inode *inode, | |
d002ebf1 | 3696 | ext4_lblk_t lblk, |
58590b06 TT |
3697 | struct ext4_ext_path *path, |
3698 | unsigned int len) | |
3699 | { | |
3700 | int i, depth; | |
3701 | struct ext4_extent_header *eh; | |
65922cb5 | 3702 | struct ext4_extent *last_ex; |
58590b06 TT |
3703 | |
3704 | if (!ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)) | |
3705 | return 0; | |
3706 | ||
3707 | depth = ext_depth(inode); | |
3708 | eh = path[depth].p_hdr; | |
58590b06 | 3709 | |
afcff5d8 LC |
3710 | /* |
3711 | * We're going to remove EOFBLOCKS_FL entirely in future so we | |
3712 | * do not care for this case anymore. Simply remove the flag | |
3713 | * if there are no extents. | |
3714 | */ | |
3715 | if (unlikely(!eh->eh_entries)) | |
3716 | goto out; | |
58590b06 TT |
3717 | last_ex = EXT_LAST_EXTENT(eh); |
3718 | /* | |
3719 | * We should clear the EOFBLOCKS_FL flag if we are writing the | |
3720 | * last block in the last extent in the file. We test this by | |
3721 | * first checking to see if the caller to | |
3722 | * ext4_ext_get_blocks() was interested in the last block (or | |
3723 | * a block beyond the last block) in the current extent. If | |
3724 | * this turns out to be false, we can bail out from this | |
3725 | * function immediately. | |
3726 | */ | |
d002ebf1 | 3727 | if (lblk + len < le32_to_cpu(last_ex->ee_block) + |
58590b06 TT |
3728 | ext4_ext_get_actual_len(last_ex)) |
3729 | return 0; | |
3730 | /* | |
3731 | * If the caller does appear to be planning to write at or | |
3732 | * beyond the end of the current extent, we then test to see | |
3733 | * if the current extent is the last extent in the file, by | |
3734 | * checking to make sure it was reached via the rightmost node | |
3735 | * at each level of the tree. | |
3736 | */ | |
3737 | for (i = depth-1; i >= 0; i--) | |
3738 | if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr)) | |
3739 | return 0; | |
afcff5d8 | 3740 | out: |
58590b06 TT |
3741 | ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
3742 | return ext4_mark_inode_dirty(handle, inode); | |
3743 | } | |
3744 | ||
7b415bf6 AK |
3745 | /** |
3746 | * ext4_find_delalloc_range: find delayed allocated block in the given range. | |
3747 | * | |
7d1b1fbc | 3748 | * Return 1 if there is a delalloc block in the range, otherwise 0. |
7b415bf6 | 3749 | */ |
f7fec032 ZL |
3750 | int ext4_find_delalloc_range(struct inode *inode, |
3751 | ext4_lblk_t lblk_start, | |
3752 | ext4_lblk_t lblk_end) | |
7b415bf6 | 3753 | { |
7d1b1fbc | 3754 | struct extent_status es; |
7b415bf6 | 3755 | |
e30b5dca | 3756 | ext4_es_find_delayed_extent_range(inode, lblk_start, lblk_end, &es); |
06b0c886 | 3757 | if (es.es_len == 0) |
7d1b1fbc | 3758 | return 0; /* there is no delay extent in this tree */ |
06b0c886 ZL |
3759 | else if (es.es_lblk <= lblk_start && |
3760 | lblk_start < es.es_lblk + es.es_len) | |
7d1b1fbc | 3761 | return 1; |
06b0c886 | 3762 | else if (lblk_start <= es.es_lblk && es.es_lblk <= lblk_end) |
7d1b1fbc | 3763 | return 1; |
7b415bf6 | 3764 | else |
7d1b1fbc | 3765 | return 0; |
7b415bf6 AK |
3766 | } |
3767 | ||
7d1b1fbc | 3768 | int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk) |
7b415bf6 AK |
3769 | { |
3770 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3771 | ext4_lblk_t lblk_start, lblk_end; | |
f5a44db5 | 3772 | lblk_start = EXT4_LBLK_CMASK(sbi, lblk); |
7b415bf6 AK |
3773 | lblk_end = lblk_start + sbi->s_cluster_ratio - 1; |
3774 | ||
7d1b1fbc | 3775 | return ext4_find_delalloc_range(inode, lblk_start, lblk_end); |
7b415bf6 AK |
3776 | } |
3777 | ||
3778 | /** | |
3779 | * Determines how many complete clusters (out of those specified by the 'map') | |
3780 | * are under delalloc and were reserved quota for. | |
3781 | * This function is called when we are writing out the blocks that were | |
3782 | * originally written with their allocation delayed, but then the space was | |
3783 | * allocated using fallocate() before the delayed allocation could be resolved. | |
3784 | * The cases to look for are: | |
3785 | * ('=' indicated delayed allocated blocks | |
3786 | * '-' indicates non-delayed allocated blocks) | |
3787 | * (a) partial clusters towards beginning and/or end outside of allocated range | |
3788 | * are not delalloc'ed. | |
3789 | * Ex: | |
3790 | * |----c---=|====c====|====c====|===-c----| | |
3791 | * |++++++ allocated ++++++| | |
3792 | * ==> 4 complete clusters in above example | |
3793 | * | |
3794 | * (b) partial cluster (outside of allocated range) towards either end is | |
3795 | * marked for delayed allocation. In this case, we will exclude that | |
3796 | * cluster. | |
3797 | * Ex: | |
3798 | * |----====c========|========c========| | |
3799 | * |++++++ allocated ++++++| | |
3800 | * ==> 1 complete clusters in above example | |
3801 | * | |
3802 | * Ex: | |
3803 | * |================c================| | |
3804 | * |++++++ allocated ++++++| | |
3805 | * ==> 0 complete clusters in above example | |
3806 | * | |
3807 | * The ext4_da_update_reserve_space will be called only if we | |
3808 | * determine here that there were some "entire" clusters that span | |
3809 | * this 'allocated' range. | |
3810 | * In the non-bigalloc case, this function will just end up returning num_blks | |
3811 | * without ever calling ext4_find_delalloc_range. | |
3812 | */ | |
3813 | static unsigned int | |
3814 | get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start, | |
3815 | unsigned int num_blks) | |
3816 | { | |
3817 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
3818 | ext4_lblk_t alloc_cluster_start, alloc_cluster_end; | |
3819 | ext4_lblk_t lblk_from, lblk_to, c_offset; | |
3820 | unsigned int allocated_clusters = 0; | |
3821 | ||
3822 | alloc_cluster_start = EXT4_B2C(sbi, lblk_start); | |
3823 | alloc_cluster_end = EXT4_B2C(sbi, lblk_start + num_blks - 1); | |
3824 | ||
3825 | /* max possible clusters for this allocation */ | |
3826 | allocated_clusters = alloc_cluster_end - alloc_cluster_start + 1; | |
3827 | ||
d8990240 AK |
3828 | trace_ext4_get_reserved_cluster_alloc(inode, lblk_start, num_blks); |
3829 | ||
7b415bf6 | 3830 | /* Check towards left side */ |
f5a44db5 | 3831 | c_offset = EXT4_LBLK_COFF(sbi, lblk_start); |
7b415bf6 | 3832 | if (c_offset) { |
f5a44db5 | 3833 | lblk_from = EXT4_LBLK_CMASK(sbi, lblk_start); |
7b415bf6 AK |
3834 | lblk_to = lblk_from + c_offset - 1; |
3835 | ||
7d1b1fbc | 3836 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
7b415bf6 AK |
3837 | allocated_clusters--; |
3838 | } | |
3839 | ||
3840 | /* Now check towards right. */ | |
f5a44db5 | 3841 | c_offset = EXT4_LBLK_COFF(sbi, lblk_start + num_blks); |
7b415bf6 AK |
3842 | if (allocated_clusters && c_offset) { |
3843 | lblk_from = lblk_start + num_blks; | |
3844 | lblk_to = lblk_from + (sbi->s_cluster_ratio - c_offset) - 1; | |
3845 | ||
7d1b1fbc | 3846 | if (ext4_find_delalloc_range(inode, lblk_from, lblk_to)) |
7b415bf6 AK |
3847 | allocated_clusters--; |
3848 | } | |
3849 | ||
3850 | return allocated_clusters; | |
3851 | } | |
3852 | ||
0031462b MC |
3853 | static int |
3854 | ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, | |
e35fd660 | 3855 | struct ext4_map_blocks *map, |
0031462b | 3856 | struct ext4_ext_path *path, int flags, |
e35fd660 | 3857 | unsigned int allocated, ext4_fsblk_t newblock) |
0031462b MC |
3858 | { |
3859 | int ret = 0; | |
3860 | int err = 0; | |
f45ee3a1 | 3861 | ext4_io_end_t *io = ext4_inode_aio(inode); |
0031462b | 3862 | |
88635ca2 ZL |
3863 | ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical " |
3864 | "block %llu, max_blocks %u, flags %x, allocated %u\n", | |
e35fd660 | 3865 | inode->i_ino, (unsigned long long)map->m_lblk, map->m_len, |
0031462b MC |
3866 | flags, allocated); |
3867 | ext4_ext_show_leaf(inode, path); | |
3868 | ||
27dd4385 LC |
3869 | /* |
3870 | * When writing into uninitialized space, we should not fail to | |
3871 | * allocate metadata blocks for the new extent block if needed. | |
3872 | */ | |
3873 | flags |= EXT4_GET_BLOCKS_METADATA_NOFAIL; | |
3874 | ||
b5645534 ZL |
3875 | trace_ext4_ext_handle_uninitialized_extents(inode, map, flags, |
3876 | allocated, newblock); | |
d8990240 | 3877 | |
c7064ef1 | 3878 | /* get_block() before submit the IO, split the extent */ |
744692dc | 3879 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) { |
e35fd660 TT |
3880 | ret = ext4_split_unwritten_extents(handle, inode, map, |
3881 | path, flags); | |
82e54229 DM |
3882 | if (ret <= 0) |
3883 | goto out; | |
5f524950 M |
3884 | /* |
3885 | * Flag the inode(non aio case) or end_io struct (aio case) | |
25985edc | 3886 | * that this IO needs to conversion to written when IO is |
5f524950 M |
3887 | * completed |
3888 | */ | |
0edeb71d TM |
3889 | if (io) |
3890 | ext4_set_io_unwritten_flag(inode, io); | |
3891 | else | |
19f5fb7a | 3892 | ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN); |
a25a4e1a | 3893 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
744692dc | 3894 | if (ext4_should_dioread_nolock(inode)) |
e35fd660 | 3895 | map->m_flags |= EXT4_MAP_UNINIT; |
0031462b MC |
3896 | goto out; |
3897 | } | |
c7064ef1 | 3898 | /* IO end_io complete, convert the filled extent to written */ |
744692dc | 3899 | if ((flags & EXT4_GET_BLOCKS_CONVERT)) { |
dee1f973 | 3900 | ret = ext4_convert_unwritten_extents_endio(handle, inode, map, |
0031462b | 3901 | path); |
58590b06 | 3902 | if (ret >= 0) { |
b436b9be | 3903 | ext4_update_inode_fsync_trans(handle, inode, 1); |
d002ebf1 ES |
3904 | err = check_eofblocks_fl(handle, inode, map->m_lblk, |
3905 | path, map->m_len); | |
58590b06 TT |
3906 | } else |
3907 | err = ret; | |
cdee7843 ZL |
3908 | map->m_flags |= EXT4_MAP_MAPPED; |
3909 | if (allocated > map->m_len) | |
3910 | allocated = map->m_len; | |
3911 | map->m_len = allocated; | |
0031462b MC |
3912 | goto out2; |
3913 | } | |
3914 | /* buffered IO case */ | |
3915 | /* | |
3916 | * repeat fallocate creation request | |
3917 | * we already have an unwritten extent | |
3918 | */ | |
a25a4e1a ZL |
3919 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT) { |
3920 | map->m_flags |= EXT4_MAP_UNWRITTEN; | |
0031462b | 3921 | goto map_out; |
a25a4e1a | 3922 | } |
0031462b MC |
3923 | |
3924 | /* buffered READ or buffered write_begin() lookup */ | |
3925 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { | |
3926 | /* | |
3927 | * We have blocks reserved already. We | |
3928 | * return allocated blocks so that delalloc | |
3929 | * won't do block reservation for us. But | |
3930 | * the buffer head will be unmapped so that | |
3931 | * a read from the block returns 0s. | |
3932 | */ | |
e35fd660 | 3933 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
0031462b MC |
3934 | goto out1; |
3935 | } | |
3936 | ||
3937 | /* buffered write, writepage time, convert*/ | |
27dd4385 | 3938 | ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags); |
a4e5d88b | 3939 | if (ret >= 0) |
b436b9be | 3940 | ext4_update_inode_fsync_trans(handle, inode, 1); |
0031462b MC |
3941 | out: |
3942 | if (ret <= 0) { | |
3943 | err = ret; | |
3944 | goto out2; | |
3945 | } else | |
3946 | allocated = ret; | |
e35fd660 | 3947 | map->m_flags |= EXT4_MAP_NEW; |
515f41c3 AK |
3948 | /* |
3949 | * if we allocated more blocks than requested | |
3950 | * we need to make sure we unmap the extra block | |
3951 | * allocated. The actual needed block will get | |
3952 | * unmapped later when we find the buffer_head marked | |
3953 | * new. | |
3954 | */ | |
e35fd660 | 3955 | if (allocated > map->m_len) { |
515f41c3 | 3956 | unmap_underlying_metadata_blocks(inode->i_sb->s_bdev, |
e35fd660 TT |
3957 | newblock + map->m_len, |
3958 | allocated - map->m_len); | |
3959 | allocated = map->m_len; | |
515f41c3 | 3960 | } |
3a225670 | 3961 | map->m_len = allocated; |
5f634d06 AK |
3962 | |
3963 | /* | |
3964 | * If we have done fallocate with the offset that is already | |
3965 | * delayed allocated, we would have block reservation | |
3966 | * and quota reservation done in the delayed write path. | |
3967 | * But fallocate would have already updated quota and block | |
3968 | * count for this offset. So cancel these reservation | |
3969 | */ | |
7b415bf6 AK |
3970 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
3971 | unsigned int reserved_clusters; | |
3972 | reserved_clusters = get_reserved_cluster_alloc(inode, | |
3973 | map->m_lblk, map->m_len); | |
3974 | if (reserved_clusters) | |
3975 | ext4_da_update_reserve_space(inode, | |
3976 | reserved_clusters, | |
3977 | 0); | |
3978 | } | |
5f634d06 | 3979 | |
0031462b | 3980 | map_out: |
e35fd660 | 3981 | map->m_flags |= EXT4_MAP_MAPPED; |
a4e5d88b DM |
3982 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) { |
3983 | err = check_eofblocks_fl(handle, inode, map->m_lblk, path, | |
3984 | map->m_len); | |
3985 | if (err < 0) | |
3986 | goto out2; | |
3987 | } | |
0031462b | 3988 | out1: |
e35fd660 TT |
3989 | if (allocated > map->m_len) |
3990 | allocated = map->m_len; | |
0031462b | 3991 | ext4_ext_show_leaf(inode, path); |
e35fd660 TT |
3992 | map->m_pblk = newblock; |
3993 | map->m_len = allocated; | |
0031462b MC |
3994 | out2: |
3995 | if (path) { | |
3996 | ext4_ext_drop_refs(path); | |
3997 | kfree(path); | |
3998 | } | |
3999 | return err ? err : allocated; | |
4000 | } | |
58590b06 | 4001 | |
4d33b1ef TT |
4002 | /* |
4003 | * get_implied_cluster_alloc - check to see if the requested | |
4004 | * allocation (in the map structure) overlaps with a cluster already | |
4005 | * allocated in an extent. | |
d8990240 | 4006 | * @sb The filesystem superblock structure |
4d33b1ef TT |
4007 | * @map The requested lblk->pblk mapping |
4008 | * @ex The extent structure which might contain an implied | |
4009 | * cluster allocation | |
4010 | * | |
4011 | * This function is called by ext4_ext_map_blocks() after we failed to | |
4012 | * find blocks that were already in the inode's extent tree. Hence, | |
4013 | * we know that the beginning of the requested region cannot overlap | |
4014 | * the extent from the inode's extent tree. There are three cases we | |
4015 | * want to catch. The first is this case: | |
4016 | * | |
4017 | * |--- cluster # N--| | |
4018 | * |--- extent ---| |---- requested region ---| | |
4019 | * |==========| | |
4020 | * | |
4021 | * The second case that we need to test for is this one: | |
4022 | * | |
4023 | * |--------- cluster # N ----------------| | |
4024 | * |--- requested region --| |------- extent ----| | |
4025 | * |=======================| | |
4026 | * | |
4027 | * The third case is when the requested region lies between two extents | |
4028 | * within the same cluster: | |
4029 | * |------------- cluster # N-------------| | |
4030 | * |----- ex -----| |---- ex_right ----| | |
4031 | * |------ requested region ------| | |
4032 | * |================| | |
4033 | * | |
4034 | * In each of the above cases, we need to set the map->m_pblk and | |
4035 | * map->m_len so it corresponds to the return the extent labelled as | |
4036 | * "|====|" from cluster #N, since it is already in use for data in | |
4037 | * cluster EXT4_B2C(sbi, map->m_lblk). We will then return 1 to | |
4038 | * signal to ext4_ext_map_blocks() that map->m_pblk should be treated | |
4039 | * as a new "allocated" block region. Otherwise, we will return 0 and | |
4040 | * ext4_ext_map_blocks() will then allocate one or more new clusters | |
4041 | * by calling ext4_mb_new_blocks(). | |
4042 | */ | |
d8990240 | 4043 | static int get_implied_cluster_alloc(struct super_block *sb, |
4d33b1ef TT |
4044 | struct ext4_map_blocks *map, |
4045 | struct ext4_extent *ex, | |
4046 | struct ext4_ext_path *path) | |
4047 | { | |
d8990240 | 4048 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
f5a44db5 | 4049 | ext4_lblk_t c_offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
4d33b1ef | 4050 | ext4_lblk_t ex_cluster_start, ex_cluster_end; |
14d7f3ef | 4051 | ext4_lblk_t rr_cluster_start; |
4d33b1ef TT |
4052 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
4053 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); | |
4054 | unsigned short ee_len = ext4_ext_get_actual_len(ex); | |
4055 | ||
4056 | /* The extent passed in that we are trying to match */ | |
4057 | ex_cluster_start = EXT4_B2C(sbi, ee_block); | |
4058 | ex_cluster_end = EXT4_B2C(sbi, ee_block + ee_len - 1); | |
4059 | ||
4060 | /* The requested region passed into ext4_map_blocks() */ | |
4061 | rr_cluster_start = EXT4_B2C(sbi, map->m_lblk); | |
4d33b1ef TT |
4062 | |
4063 | if ((rr_cluster_start == ex_cluster_end) || | |
4064 | (rr_cluster_start == ex_cluster_start)) { | |
4065 | if (rr_cluster_start == ex_cluster_end) | |
4066 | ee_start += ee_len - 1; | |
f5a44db5 | 4067 | map->m_pblk = EXT4_PBLK_CMASK(sbi, ee_start) + c_offset; |
4d33b1ef TT |
4068 | map->m_len = min(map->m_len, |
4069 | (unsigned) sbi->s_cluster_ratio - c_offset); | |
4070 | /* | |
4071 | * Check for and handle this case: | |
4072 | * | |
4073 | * |--------- cluster # N-------------| | |
4074 | * |------- extent ----| | |
4075 | * |--- requested region ---| | |
4076 | * |===========| | |
4077 | */ | |
4078 | ||
4079 | if (map->m_lblk < ee_block) | |
4080 | map->m_len = min(map->m_len, ee_block - map->m_lblk); | |
4081 | ||
4082 | /* | |
4083 | * Check for the case where there is already another allocated | |
4084 | * block to the right of 'ex' but before the end of the cluster. | |
4085 | * | |
4086 | * |------------- cluster # N-------------| | |
4087 | * |----- ex -----| |---- ex_right ----| | |
4088 | * |------ requested region ------| | |
4089 | * |================| | |
4090 | */ | |
4091 | if (map->m_lblk > ee_block) { | |
4092 | ext4_lblk_t next = ext4_ext_next_allocated_block(path); | |
4093 | map->m_len = min(map->m_len, next - map->m_lblk); | |
4094 | } | |
d8990240 AK |
4095 | |
4096 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 1); | |
4d33b1ef TT |
4097 | return 1; |
4098 | } | |
d8990240 AK |
4099 | |
4100 | trace_ext4_get_implied_cluster_alloc_exit(sb, map, 0); | |
4d33b1ef TT |
4101 | return 0; |
4102 | } | |
4103 | ||
4104 | ||
c278bfec | 4105 | /* |
f5ab0d1f MC |
4106 | * Block allocation/map/preallocation routine for extents based files |
4107 | * | |
4108 | * | |
c278bfec | 4109 | * Need to be called with |
0e855ac8 AK |
4110 | * down_read(&EXT4_I(inode)->i_data_sem) if not allocating file system block |
4111 | * (ie, create is zero). Otherwise down_write(&EXT4_I(inode)->i_data_sem) | |
f5ab0d1f MC |
4112 | * |
4113 | * return > 0, number of of blocks already mapped/allocated | |
4114 | * if create == 0 and these are pre-allocated blocks | |
4115 | * buffer head is unmapped | |
4116 | * otherwise blocks are mapped | |
4117 | * | |
4118 | * return = 0, if plain look up failed (blocks have not been allocated) | |
4119 | * buffer head is unmapped | |
4120 | * | |
4121 | * return < 0, error case. | |
c278bfec | 4122 | */ |
e35fd660 TT |
4123 | int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, |
4124 | struct ext4_map_blocks *map, int flags) | |
a86c6181 AT |
4125 | { |
4126 | struct ext4_ext_path *path = NULL; | |
4d33b1ef TT |
4127 | struct ext4_extent newex, *ex, *ex2; |
4128 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); | |
0562e0ba | 4129 | ext4_fsblk_t newblock = 0; |
37794732 | 4130 | int free_on_err = 0, err = 0, depth; |
4d33b1ef | 4131 | unsigned int allocated = 0, offset = 0; |
81fdbb4a | 4132 | unsigned int allocated_clusters = 0; |
c9de560d | 4133 | struct ext4_allocation_request ar; |
f45ee3a1 | 4134 | ext4_io_end_t *io = ext4_inode_aio(inode); |
4d33b1ef | 4135 | ext4_lblk_t cluster_offset; |
82e54229 | 4136 | int set_unwritten = 0; |
a86c6181 | 4137 | |
84fe3bef | 4138 | ext_debug("blocks %u/%u requested for inode %lu\n", |
e35fd660 | 4139 | map->m_lblk, map->m_len, inode->i_ino); |
0562e0ba | 4140 | trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags); |
a86c6181 | 4141 | |
a86c6181 | 4142 | /* find extent for this block */ |
107a7bd3 | 4143 | path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0); |
a86c6181 AT |
4144 | if (IS_ERR(path)) { |
4145 | err = PTR_ERR(path); | |
4146 | path = NULL; | |
4147 | goto out2; | |
4148 | } | |
4149 | ||
4150 | depth = ext_depth(inode); | |
4151 | ||
4152 | /* | |
d0d856e8 RD |
4153 | * consistent leaf must not be empty; |
4154 | * this situation is possible, though, _during_ tree modification; | |
a86c6181 AT |
4155 | * this is why assert can't be put in ext4_ext_find_extent() |
4156 | */ | |
273df556 FM |
4157 | if (unlikely(path[depth].p_ext == NULL && depth != 0)) { |
4158 | EXT4_ERROR_INODE(inode, "bad extent address " | |
f70f362b TT |
4159 | "lblock: %lu, depth: %d pblock %lld", |
4160 | (unsigned long) map->m_lblk, depth, | |
4161 | path[depth].p_block); | |
034fb4c9 SP |
4162 | err = -EIO; |
4163 | goto out2; | |
4164 | } | |
a86c6181 | 4165 | |
7e028976 AM |
4166 | ex = path[depth].p_ext; |
4167 | if (ex) { | |
725d26d3 | 4168 | ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block); |
bf89d16f | 4169 | ext4_fsblk_t ee_start = ext4_ext_pblock(ex); |
a2df2a63 | 4170 | unsigned short ee_len; |
471d4011 SB |
4171 | |
4172 | /* | |
471d4011 | 4173 | * Uninitialized extents are treated as holes, except that |
56055d3a | 4174 | * we split out initialized portions during a write. |
471d4011 | 4175 | */ |
a2df2a63 | 4176 | ee_len = ext4_ext_get_actual_len(ex); |
d8990240 AK |
4177 | |
4178 | trace_ext4_ext_show_extent(inode, ee_block, ee_start, ee_len); | |
4179 | ||
d0d856e8 | 4180 | /* if found extent covers block, simply return it */ |
e35fd660 TT |
4181 | if (in_range(map->m_lblk, ee_block, ee_len)) { |
4182 | newblock = map->m_lblk - ee_block + ee_start; | |
d0d856e8 | 4183 | /* number of remaining blocks in the extent */ |
e35fd660 TT |
4184 | allocated = ee_len - (map->m_lblk - ee_block); |
4185 | ext_debug("%u fit into %u:%d -> %llu\n", map->m_lblk, | |
4186 | ee_block, ee_len, newblock); | |
56055d3a | 4187 | |
69eb33dc | 4188 | if (!ext4_ext_is_uninitialized(ex)) |
7877191c | 4189 | goto out; |
69eb33dc | 4190 | |
37794732 | 4191 | allocated = ext4_ext_handle_uninitialized_extents( |
7877191c LC |
4192 | handle, inode, map, path, flags, |
4193 | allocated, newblock); | |
37794732 | 4194 | goto out3; |
a86c6181 AT |
4195 | } |
4196 | } | |
4197 | ||
7b415bf6 | 4198 | if ((sbi->s_cluster_ratio > 1) && |
7d1b1fbc | 4199 | ext4_find_delalloc_cluster(inode, map->m_lblk)) |
7b415bf6 AK |
4200 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
4201 | ||
a86c6181 | 4202 | /* |
d0d856e8 | 4203 | * requested block isn't allocated yet; |
a86c6181 AT |
4204 | * we couldn't try to create block if create flag is zero |
4205 | */ | |
c2177057 | 4206 | if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) { |
56055d3a AA |
4207 | /* |
4208 | * put just found gap into cache to speed up | |
4209 | * subsequent requests | |
4210 | */ | |
d100eef2 ZL |
4211 | if ((flags & EXT4_GET_BLOCKS_NO_PUT_HOLE) == 0) |
4212 | ext4_ext_put_gap_in_cache(inode, path, map->m_lblk); | |
a86c6181 AT |
4213 | goto out2; |
4214 | } | |
4d33b1ef | 4215 | |
a86c6181 | 4216 | /* |
c2ea3fde | 4217 | * Okay, we need to do block allocation. |
63f57933 | 4218 | */ |
7b415bf6 | 4219 | map->m_flags &= ~EXT4_MAP_FROM_CLUSTER; |
4d33b1ef | 4220 | newex.ee_block = cpu_to_le32(map->m_lblk); |
d0abafac | 4221 | cluster_offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
4d33b1ef TT |
4222 | |
4223 | /* | |
4224 | * If we are doing bigalloc, check to see if the extent returned | |
4225 | * by ext4_ext_find_extent() implies a cluster we can use. | |
4226 | */ | |
4227 | if (cluster_offset && ex && | |
d8990240 | 4228 | get_implied_cluster_alloc(inode->i_sb, map, ex, path)) { |
4d33b1ef TT |
4229 | ar.len = allocated = map->m_len; |
4230 | newblock = map->m_pblk; | |
7b415bf6 | 4231 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
4d33b1ef TT |
4232 | goto got_allocated_blocks; |
4233 | } | |
a86c6181 | 4234 | |
c9de560d | 4235 | /* find neighbour allocated blocks */ |
e35fd660 | 4236 | ar.lleft = map->m_lblk; |
c9de560d AT |
4237 | err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft); |
4238 | if (err) | |
4239 | goto out2; | |
e35fd660 | 4240 | ar.lright = map->m_lblk; |
4d33b1ef TT |
4241 | ex2 = NULL; |
4242 | err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright, &ex2); | |
c9de560d AT |
4243 | if (err) |
4244 | goto out2; | |
25d14f98 | 4245 | |
4d33b1ef TT |
4246 | /* Check if the extent after searching to the right implies a |
4247 | * cluster we can use. */ | |
4248 | if ((sbi->s_cluster_ratio > 1) && ex2 && | |
d8990240 | 4249 | get_implied_cluster_alloc(inode->i_sb, map, ex2, path)) { |
4d33b1ef TT |
4250 | ar.len = allocated = map->m_len; |
4251 | newblock = map->m_pblk; | |
7b415bf6 | 4252 | map->m_flags |= EXT4_MAP_FROM_CLUSTER; |
4d33b1ef TT |
4253 | goto got_allocated_blocks; |
4254 | } | |
4255 | ||
749269fa AA |
4256 | /* |
4257 | * See if request is beyond maximum number of blocks we can have in | |
4258 | * a single extent. For an initialized extent this limit is | |
4259 | * EXT_INIT_MAX_LEN and for an uninitialized extent this limit is | |
4260 | * EXT_UNINIT_MAX_LEN. | |
4261 | */ | |
e35fd660 | 4262 | if (map->m_len > EXT_INIT_MAX_LEN && |
c2177057 | 4263 | !(flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
e35fd660 TT |
4264 | map->m_len = EXT_INIT_MAX_LEN; |
4265 | else if (map->m_len > EXT_UNINIT_MAX_LEN && | |
c2177057 | 4266 | (flags & EXT4_GET_BLOCKS_UNINIT_EXT)) |
e35fd660 | 4267 | map->m_len = EXT_UNINIT_MAX_LEN; |
749269fa | 4268 | |
e35fd660 | 4269 | /* Check if we can really insert (m_lblk)::(m_lblk + m_len) extent */ |
e35fd660 | 4270 | newex.ee_len = cpu_to_le16(map->m_len); |
4d33b1ef | 4271 | err = ext4_ext_check_overlap(sbi, inode, &newex, path); |
25d14f98 | 4272 | if (err) |
b939e376 | 4273 | allocated = ext4_ext_get_actual_len(&newex); |
25d14f98 | 4274 | else |
e35fd660 | 4275 | allocated = map->m_len; |
c9de560d AT |
4276 | |
4277 | /* allocate new block */ | |
4278 | ar.inode = inode; | |
e35fd660 TT |
4279 | ar.goal = ext4_ext_find_goal(inode, path, map->m_lblk); |
4280 | ar.logical = map->m_lblk; | |
4d33b1ef TT |
4281 | /* |
4282 | * We calculate the offset from the beginning of the cluster | |
4283 | * for the logical block number, since when we allocate a | |
4284 | * physical cluster, the physical block should start at the | |
4285 | * same offset from the beginning of the cluster. This is | |
4286 | * needed so that future calls to get_implied_cluster_alloc() | |
4287 | * work correctly. | |
4288 | */ | |
f5a44db5 | 4289 | offset = EXT4_LBLK_COFF(sbi, map->m_lblk); |
4d33b1ef TT |
4290 | ar.len = EXT4_NUM_B2C(sbi, offset+allocated); |
4291 | ar.goal -= offset; | |
4292 | ar.logical -= offset; | |
c9de560d AT |
4293 | if (S_ISREG(inode->i_mode)) |
4294 | ar.flags = EXT4_MB_HINT_DATA; | |
4295 | else | |
4296 | /* disable in-core preallocation for non-regular files */ | |
4297 | ar.flags = 0; | |
556b27ab VH |
4298 | if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE) |
4299 | ar.flags |= EXT4_MB_HINT_NOPREALLOC; | |
c9de560d | 4300 | newblock = ext4_mb_new_blocks(handle, &ar, &err); |
a86c6181 AT |
4301 | if (!newblock) |
4302 | goto out2; | |
84fe3bef | 4303 | ext_debug("allocate new block: goal %llu, found %llu/%u\n", |
498e5f24 | 4304 | ar.goal, newblock, allocated); |
4d33b1ef | 4305 | free_on_err = 1; |
7b415bf6 | 4306 | allocated_clusters = ar.len; |
4d33b1ef TT |
4307 | ar.len = EXT4_C2B(sbi, ar.len) - offset; |
4308 | if (ar.len > allocated) | |
4309 | ar.len = allocated; | |
a86c6181 | 4310 | |
4d33b1ef | 4311 | got_allocated_blocks: |
a86c6181 | 4312 | /* try to insert new extent into found leaf and return */ |
4d33b1ef | 4313 | ext4_ext_store_pblock(&newex, newblock + offset); |
c9de560d | 4314 | newex.ee_len = cpu_to_le16(ar.len); |
8d5d02e6 MC |
4315 | /* Mark uninitialized */ |
4316 | if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){ | |
a2df2a63 | 4317 | ext4_ext_mark_uninitialized(&newex); |
a25a4e1a | 4318 | map->m_flags |= EXT4_MAP_UNWRITTEN; |
8d5d02e6 | 4319 | /* |
744692dc | 4320 | * io_end structure was created for every IO write to an |
25985edc | 4321 | * uninitialized extent. To avoid unnecessary conversion, |
744692dc | 4322 | * here we flag the IO that really needs the conversion. |
5f524950 | 4323 | * For non asycn direct IO case, flag the inode state |
25985edc | 4324 | * that we need to perform conversion when IO is done. |
8d5d02e6 | 4325 | */ |
82e54229 DM |
4326 | if ((flags & EXT4_GET_BLOCKS_PRE_IO)) |
4327 | set_unwritten = 1; | |
744692dc | 4328 | if (ext4_should_dioread_nolock(inode)) |
e35fd660 | 4329 | map->m_flags |= EXT4_MAP_UNINIT; |
8d5d02e6 | 4330 | } |
c8d46e41 | 4331 | |
a4e5d88b DM |
4332 | err = 0; |
4333 | if ((flags & EXT4_GET_BLOCKS_KEEP_SIZE) == 0) | |
4334 | err = check_eofblocks_fl(handle, inode, map->m_lblk, | |
4335 | path, ar.len); | |
575a1d4b JZ |
4336 | if (!err) |
4337 | err = ext4_ext_insert_extent(handle, inode, path, | |
4338 | &newex, flags); | |
82e54229 DM |
4339 | |
4340 | if (!err && set_unwritten) { | |
4341 | if (io) | |
4342 | ext4_set_io_unwritten_flag(inode, io); | |
4343 | else | |
4344 | ext4_set_inode_state(inode, | |
4345 | EXT4_STATE_DIO_UNWRITTEN); | |
4346 | } | |
4347 | ||
4d33b1ef | 4348 | if (err && free_on_err) { |
7132de74 MP |
4349 | int fb_flags = flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE ? |
4350 | EXT4_FREE_BLOCKS_NO_QUOT_UPDATE : 0; | |
315054f0 | 4351 | /* free data blocks we just allocated */ |
c9de560d AT |
4352 | /* not a good idea to call discard here directly, |
4353 | * but otherwise we'd need to call it every free() */ | |
c2ea3fde | 4354 | ext4_discard_preallocations(inode); |
c8e15130 TT |
4355 | ext4_free_blocks(handle, inode, NULL, newblock, |
4356 | EXT4_C2B(sbi, allocated_clusters), fb_flags); | |
a86c6181 | 4357 | goto out2; |
315054f0 | 4358 | } |
a86c6181 | 4359 | |
a86c6181 | 4360 | /* previous routine could use block we allocated */ |
bf89d16f | 4361 | newblock = ext4_ext_pblock(&newex); |
b939e376 | 4362 | allocated = ext4_ext_get_actual_len(&newex); |
e35fd660 TT |
4363 | if (allocated > map->m_len) |
4364 | allocated = map->m_len; | |
4365 | map->m_flags |= EXT4_MAP_NEW; | |
a86c6181 | 4366 | |
5f634d06 AK |
4367 | /* |
4368 | * Update reserved blocks/metadata blocks after successful | |
4369 | * block allocation which had been deferred till now. | |
4370 | */ | |
7b415bf6 | 4371 | if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) { |
81fdbb4a | 4372 | unsigned int reserved_clusters; |
7b415bf6 | 4373 | /* |
81fdbb4a | 4374 | * Check how many clusters we had reserved this allocated range |
7b415bf6 AK |
4375 | */ |
4376 | reserved_clusters = get_reserved_cluster_alloc(inode, | |
4377 | map->m_lblk, allocated); | |
4378 | if (map->m_flags & EXT4_MAP_FROM_CLUSTER) { | |
4379 | if (reserved_clusters) { | |
4380 | /* | |
4381 | * We have clusters reserved for this range. | |
4382 | * But since we are not doing actual allocation | |
4383 | * and are simply using blocks from previously | |
4384 | * allocated cluster, we should release the | |
4385 | * reservation and not claim quota. | |
4386 | */ | |
4387 | ext4_da_update_reserve_space(inode, | |
4388 | reserved_clusters, 0); | |
4389 | } | |
4390 | } else { | |
4391 | BUG_ON(allocated_clusters < reserved_clusters); | |
7b415bf6 | 4392 | if (reserved_clusters < allocated_clusters) { |
5356f261 | 4393 | struct ext4_inode_info *ei = EXT4_I(inode); |
7b415bf6 AK |
4394 | int reservation = allocated_clusters - |
4395 | reserved_clusters; | |
4396 | /* | |
4397 | * It seems we claimed few clusters outside of | |
4398 | * the range of this allocation. We should give | |
4399 | * it back to the reservation pool. This can | |
4400 | * happen in the following case: | |
4401 | * | |
4402 | * * Suppose s_cluster_ratio is 4 (i.e., each | |
4403 | * cluster has 4 blocks. Thus, the clusters | |
4404 | * are [0-3],[4-7],[8-11]... | |
4405 | * * First comes delayed allocation write for | |
4406 | * logical blocks 10 & 11. Since there were no | |
4407 | * previous delayed allocated blocks in the | |
4408 | * range [8-11], we would reserve 1 cluster | |
4409 | * for this write. | |
4410 | * * Next comes write for logical blocks 3 to 8. | |
4411 | * In this case, we will reserve 2 clusters | |
4412 | * (for [0-3] and [4-7]; and not for [8-11] as | |
4413 | * that range has a delayed allocated blocks. | |
4414 | * Thus total reserved clusters now becomes 3. | |
4415 | * * Now, during the delayed allocation writeout | |
4416 | * time, we will first write blocks [3-8] and | |
4417 | * allocate 3 clusters for writing these | |
4418 | * blocks. Also, we would claim all these | |
4419 | * three clusters above. | |
4420 | * * Now when we come here to writeout the | |
4421 | * blocks [10-11], we would expect to claim | |
4422 | * the reservation of 1 cluster we had made | |
4423 | * (and we would claim it since there are no | |
4424 | * more delayed allocated blocks in the range | |
4425 | * [8-11]. But our reserved cluster count had | |
4426 | * already gone to 0. | |
4427 | * | |
4428 | * Thus, at the step 4 above when we determine | |
4429 | * that there are still some unwritten delayed | |
4430 | * allocated blocks outside of our current | |
4431 | * block range, we should increment the | |
4432 | * reserved clusters count so that when the | |
4433 | * remaining blocks finally gets written, we | |
4434 | * could claim them. | |
4435 | */ | |
5356f261 AK |
4436 | dquot_reserve_block(inode, |
4437 | EXT4_C2B(sbi, reservation)); | |
4438 | spin_lock(&ei->i_block_reservation_lock); | |
4439 | ei->i_reserved_data_blocks += reservation; | |
4440 | spin_unlock(&ei->i_block_reservation_lock); | |
7b415bf6 | 4441 | } |
232ec872 LC |
4442 | /* |
4443 | * We will claim quota for all newly allocated blocks. | |
4444 | * We're updating the reserved space *after* the | |
4445 | * correction above so we do not accidentally free | |
4446 | * all the metadata reservation because we might | |
4447 | * actually need it later on. | |
4448 | */ | |
4449 | ext4_da_update_reserve_space(inode, allocated_clusters, | |
4450 | 1); | |
7b415bf6 AK |
4451 | } |
4452 | } | |
5f634d06 | 4453 | |
b436b9be JK |
4454 | /* |
4455 | * Cache the extent and update transaction to commit on fdatasync only | |
4456 | * when it is _not_ an uninitialized extent. | |
4457 | */ | |
69eb33dc | 4458 | if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) |
b436b9be | 4459 | ext4_update_inode_fsync_trans(handle, inode, 1); |
69eb33dc | 4460 | else |
b436b9be | 4461 | ext4_update_inode_fsync_trans(handle, inode, 0); |
a86c6181 | 4462 | out: |
e35fd660 TT |
4463 | if (allocated > map->m_len) |
4464 | allocated = map->m_len; | |
a86c6181 | 4465 | ext4_ext_show_leaf(inode, path); |
e35fd660 TT |
4466 | map->m_flags |= EXT4_MAP_MAPPED; |
4467 | map->m_pblk = newblock; | |
4468 | map->m_len = allocated; | |
a86c6181 AT |
4469 | out2: |
4470 | if (path) { | |
4471 | ext4_ext_drop_refs(path); | |
4472 | kfree(path); | |
4473 | } | |
e861304b | 4474 | |
37794732 | 4475 | out3: |
63b99968 TT |
4476 | trace_ext4_ext_map_blocks_exit(inode, flags, map, |
4477 | err ? err : allocated); | |
4478 | ext4_es_lru_add(inode); | |
7877191c | 4479 | return err ? err : allocated; |
a86c6181 AT |
4480 | } |
4481 | ||
819c4920 | 4482 | void ext4_ext_truncate(handle_t *handle, struct inode *inode) |
a86c6181 | 4483 | { |
a86c6181 | 4484 | struct super_block *sb = inode->i_sb; |
725d26d3 | 4485 | ext4_lblk_t last_block; |
a86c6181 AT |
4486 | int err = 0; |
4487 | ||
a86c6181 | 4488 | /* |
d0d856e8 RD |
4489 | * TODO: optimization is possible here. |
4490 | * Probably we need not scan at all, | |
4491 | * because page truncation is enough. | |
a86c6181 | 4492 | */ |
a86c6181 AT |
4493 | |
4494 | /* we have to know where to truncate from in crash case */ | |
4495 | EXT4_I(inode)->i_disksize = inode->i_size; | |
4496 | ext4_mark_inode_dirty(handle, inode); | |
4497 | ||
4498 | last_block = (inode->i_size + sb->s_blocksize - 1) | |
4499 | >> EXT4_BLOCK_SIZE_BITS(sb); | |
8acd5e9b | 4500 | retry: |
51865fda ZL |
4501 | err = ext4_es_remove_extent(inode, last_block, |
4502 | EXT_MAX_BLOCKS - last_block); | |
94eec0fc | 4503 | if (err == -ENOMEM) { |
8acd5e9b TT |
4504 | cond_resched(); |
4505 | congestion_wait(BLK_RW_ASYNC, HZ/50); | |
4506 | goto retry; | |
4507 | } | |
4508 | if (err) { | |
4509 | ext4_std_error(inode->i_sb, err); | |
4510 | return; | |
4511 | } | |
5f95d21f | 4512 | err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1); |
8acd5e9b | 4513 | ext4_std_error(inode->i_sb, err); |
a86c6181 AT |
4514 | } |
4515 | ||
fd28784a AK |
4516 | static void ext4_falloc_update_inode(struct inode *inode, |
4517 | int mode, loff_t new_size, int update_ctime) | |
4518 | { | |
4519 | struct timespec now; | |
4520 | ||
4521 | if (update_ctime) { | |
4522 | now = current_fs_time(inode->i_sb); | |
4523 | if (!timespec_equal(&inode->i_ctime, &now)) | |
4524 | inode->i_ctime = now; | |
4525 | } | |
4526 | /* | |
4527 | * Update only when preallocation was requested beyond | |
4528 | * the file size. | |
4529 | */ | |
cf17fea6 AK |
4530 | if (!(mode & FALLOC_FL_KEEP_SIZE)) { |
4531 | if (new_size > i_size_read(inode)) | |
4532 | i_size_write(inode, new_size); | |
4533 | if (new_size > EXT4_I(inode)->i_disksize) | |
4534 | ext4_update_i_disksize(inode, new_size); | |
c8d46e41 JZ |
4535 | } else { |
4536 | /* | |
4537 | * Mark that we allocate beyond EOF so the subsequent truncate | |
4538 | * can proceed even if the new size is the same as i_size. | |
4539 | */ | |
4540 | if (new_size > i_size_read(inode)) | |
12e9b892 | 4541 | ext4_set_inode_flag(inode, EXT4_INODE_EOFBLOCKS); |
fd28784a AK |
4542 | } |
4543 | ||
4544 | } | |
4545 | ||
a2df2a63 | 4546 | /* |
2fe17c10 | 4547 | * preallocate space for a file. This implements ext4's fallocate file |
a2df2a63 AA |
4548 | * operation, which gets called from sys_fallocate system call. |
4549 | * For block-mapped files, posix_fallocate should fall back to the method | |
4550 | * of writing zeroes to the required new blocks (the same behavior which is | |
4551 | * expected for file systems which do not support fallocate() system call). | |
4552 | */ | |
2fe17c10 | 4553 | long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) |
a2df2a63 | 4554 | { |
496ad9aa | 4555 | struct inode *inode = file_inode(file); |
a2df2a63 | 4556 | handle_t *handle; |
fd28784a | 4557 | loff_t new_size; |
498e5f24 | 4558 | unsigned int max_blocks; |
a2df2a63 AA |
4559 | int ret = 0; |
4560 | int ret2 = 0; | |
4561 | int retries = 0; | |
a4e5d88b | 4562 | int flags; |
2ed88685 | 4563 | struct ext4_map_blocks map; |
a2df2a63 AA |
4564 | unsigned int credits, blkbits = inode->i_blkbits; |
4565 | ||
a4bb6b64 AH |
4566 | /* Return error if mode is not supported */ |
4567 | if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) | |
4568 | return -EOPNOTSUPP; | |
4569 | ||
4570 | if (mode & FALLOC_FL_PUNCH_HOLE) | |
aeb2817a | 4571 | return ext4_punch_hole(inode, offset, len); |
a4bb6b64 | 4572 | |
0c8d414f TM |
4573 | ret = ext4_convert_inline_data(inode); |
4574 | if (ret) | |
4575 | return ret; | |
4576 | ||
8bad6fc8 ZL |
4577 | /* |
4578 | * currently supporting (pre)allocate mode for extent-based | |
4579 | * files _only_ | |
4580 | */ | |
4581 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) | |
4582 | return -EOPNOTSUPP; | |
4583 | ||
0562e0ba | 4584 | trace_ext4_fallocate_enter(inode, offset, len, mode); |
2ed88685 | 4585 | map.m_lblk = offset >> blkbits; |
fd28784a AK |
4586 | /* |
4587 | * We can't just convert len to max_blocks because | |
4588 | * If blocksize = 4096 offset = 3072 and len = 2048 | |
4589 | */ | |
a2df2a63 | 4590 | max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) |
2ed88685 | 4591 | - map.m_lblk; |
a2df2a63 | 4592 | /* |
f3bd1f3f | 4593 | * credits to insert 1 extent into extent tree |
a2df2a63 | 4594 | */ |
f3bd1f3f | 4595 | credits = ext4_chunk_trans_blocks(inode, max_blocks); |
55bd725a | 4596 | mutex_lock(&inode->i_mutex); |
6d19c42b NK |
4597 | ret = inode_newsize_ok(inode, (len + offset)); |
4598 | if (ret) { | |
4599 | mutex_unlock(&inode->i_mutex); | |
0562e0ba | 4600 | trace_ext4_fallocate_exit(inode, offset, max_blocks, ret); |
6d19c42b NK |
4601 | return ret; |
4602 | } | |
3c6fe770 | 4603 | flags = EXT4_GET_BLOCKS_CREATE_UNINIT_EXT; |
a4e5d88b DM |
4604 | if (mode & FALLOC_FL_KEEP_SIZE) |
4605 | flags |= EXT4_GET_BLOCKS_KEEP_SIZE; | |
3c6fe770 GH |
4606 | /* |
4607 | * Don't normalize the request if it can fit in one extent so | |
4608 | * that it doesn't get unnecessarily split into multiple | |
4609 | * extents. | |
4610 | */ | |
4611 | if (len <= EXT_UNINIT_MAX_LEN << blkbits) | |
4612 | flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; | |
60d4616f | 4613 | |
a2df2a63 AA |
4614 | retry: |
4615 | while (ret >= 0 && ret < max_blocks) { | |
2ed88685 TT |
4616 | map.m_lblk = map.m_lblk + ret; |
4617 | map.m_len = max_blocks = max_blocks - ret; | |
9924a92a TT |
4618 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, |
4619 | credits); | |
a2df2a63 AA |
4620 | if (IS_ERR(handle)) { |
4621 | ret = PTR_ERR(handle); | |
4622 | break; | |
4623 | } | |
a4e5d88b | 4624 | ret = ext4_map_blocks(handle, inode, &map, flags); |
221879c9 | 4625 | if (ret <= 0) { |
2c98615d | 4626 | #ifdef EXT4FS_DEBUG |
b06acd38 LC |
4627 | ext4_warning(inode->i_sb, |
4628 | "inode #%lu: block %u: len %u: " | |
4629 | "ext4_ext_map_blocks returned %d", | |
4630 | inode->i_ino, map.m_lblk, | |
4631 | map.m_len, ret); | |
2c98615d | 4632 | #endif |
a2df2a63 AA |
4633 | ext4_mark_inode_dirty(handle, inode); |
4634 | ret2 = ext4_journal_stop(handle); | |
4635 | break; | |
4636 | } | |
2ed88685 | 4637 | if ((map.m_lblk + ret) >= (EXT4_BLOCK_ALIGN(offset + len, |
fd28784a AK |
4638 | blkbits) >> blkbits)) |
4639 | new_size = offset + len; | |
4640 | else | |
29ae07b7 | 4641 | new_size = ((loff_t) map.m_lblk + ret) << blkbits; |
a2df2a63 | 4642 | |
fd28784a | 4643 | ext4_falloc_update_inode(inode, mode, new_size, |
2ed88685 | 4644 | (map.m_flags & EXT4_MAP_NEW)); |
a2df2a63 | 4645 | ext4_mark_inode_dirty(handle, inode); |
f4e95b33 ZL |
4646 | if ((file->f_flags & O_SYNC) && ret >= max_blocks) |
4647 | ext4_handle_sync(handle); | |
a2df2a63 AA |
4648 | ret2 = ext4_journal_stop(handle); |
4649 | if (ret2) | |
4650 | break; | |
4651 | } | |
fd28784a AK |
4652 | if (ret == -ENOSPC && |
4653 | ext4_should_retry_alloc(inode->i_sb, &retries)) { | |
4654 | ret = 0; | |
a2df2a63 | 4655 | goto retry; |
a2df2a63 | 4656 | } |
55bd725a | 4657 | mutex_unlock(&inode->i_mutex); |
0562e0ba JZ |
4658 | trace_ext4_fallocate_exit(inode, offset, max_blocks, |
4659 | ret > 0 ? ret2 : ret); | |
a2df2a63 AA |
4660 | return ret > 0 ? ret2 : ret; |
4661 | } | |
6873fa0d | 4662 | |
0031462b MC |
4663 | /* |
4664 | * This function convert a range of blocks to written extents | |
4665 | * The caller of this function will pass the start offset and the size. | |
4666 | * all unwritten extents within this range will be converted to | |
4667 | * written extents. | |
4668 | * | |
4669 | * This function is called from the direct IO end io call back | |
4670 | * function, to convert the fallocated extents after IO is completed. | |
109f5565 | 4671 | * Returns 0 on success. |
0031462b | 4672 | */ |
6b523df4 JK |
4673 | int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, |
4674 | loff_t offset, ssize_t len) | |
0031462b | 4675 | { |
0031462b MC |
4676 | unsigned int max_blocks; |
4677 | int ret = 0; | |
4678 | int ret2 = 0; | |
2ed88685 | 4679 | struct ext4_map_blocks map; |
0031462b MC |
4680 | unsigned int credits, blkbits = inode->i_blkbits; |
4681 | ||
2ed88685 | 4682 | map.m_lblk = offset >> blkbits; |
0031462b MC |
4683 | /* |
4684 | * We can't just convert len to max_blocks because | |
4685 | * If blocksize = 4096 offset = 3072 and len = 2048 | |
4686 | */ | |
2ed88685 TT |
4687 | max_blocks = ((EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits) - |
4688 | map.m_lblk); | |
0031462b | 4689 | /* |
6b523df4 JK |
4690 | * This is somewhat ugly but the idea is clear: When transaction is |
4691 | * reserved, everything goes into it. Otherwise we rather start several | |
4692 | * smaller transactions for conversion of each extent separately. | |
0031462b | 4693 | */ |
6b523df4 JK |
4694 | if (handle) { |
4695 | handle = ext4_journal_start_reserved(handle, | |
4696 | EXT4_HT_EXT_CONVERT); | |
4697 | if (IS_ERR(handle)) | |
4698 | return PTR_ERR(handle); | |
4699 | credits = 0; | |
4700 | } else { | |
4701 | /* | |
4702 | * credits to insert 1 extent into extent tree | |
4703 | */ | |
4704 | credits = ext4_chunk_trans_blocks(inode, max_blocks); | |
4705 | } | |
0031462b | 4706 | while (ret >= 0 && ret < max_blocks) { |
2ed88685 TT |
4707 | map.m_lblk += ret; |
4708 | map.m_len = (max_blocks -= ret); | |
6b523df4 JK |
4709 | if (credits) { |
4710 | handle = ext4_journal_start(inode, EXT4_HT_MAP_BLOCKS, | |
4711 | credits); | |
4712 | if (IS_ERR(handle)) { | |
4713 | ret = PTR_ERR(handle); | |
4714 | break; | |
4715 | } | |
0031462b | 4716 | } |
2ed88685 | 4717 | ret = ext4_map_blocks(handle, inode, &map, |
c7064ef1 | 4718 | EXT4_GET_BLOCKS_IO_CONVERT_EXT); |
b06acd38 LC |
4719 | if (ret <= 0) |
4720 | ext4_warning(inode->i_sb, | |
4721 | "inode #%lu: block %u: len %u: " | |
4722 | "ext4_ext_map_blocks returned %d", | |
4723 | inode->i_ino, map.m_lblk, | |
4724 | map.m_len, ret); | |
0031462b | 4725 | ext4_mark_inode_dirty(handle, inode); |
6b523df4 JK |
4726 | if (credits) |
4727 | ret2 = ext4_journal_stop(handle); | |
4728 | if (ret <= 0 || ret2) | |
0031462b MC |
4729 | break; |
4730 | } | |
6b523df4 JK |
4731 | if (!credits) |
4732 | ret2 = ext4_journal_stop(handle); | |
0031462b MC |
4733 | return ret > 0 ? ret2 : ret; |
4734 | } | |
6d9c85eb | 4735 | |
6873fa0d | 4736 | /* |
69eb33dc ZL |
4737 | * If newes is not existing extent (newes->ec_pblk equals zero) find |
4738 | * delayed extent at start of newes and update newes accordingly and | |
91dd8c11 LC |
4739 | * return start of the next delayed extent. |
4740 | * | |
69eb33dc | 4741 | * If newes is existing extent (newes->ec_pblk is not equal zero) |
91dd8c11 | 4742 | * return start of next delayed extent or EXT_MAX_BLOCKS if no delayed |
69eb33dc | 4743 | * extent found. Leave newes unmodified. |
6873fa0d | 4744 | */ |
91dd8c11 | 4745 | static int ext4_find_delayed_extent(struct inode *inode, |
69eb33dc | 4746 | struct extent_status *newes) |
6873fa0d | 4747 | { |
b3aff3e3 | 4748 | struct extent_status es; |
be401363 | 4749 | ext4_lblk_t block, next_del; |
6873fa0d | 4750 | |
69eb33dc | 4751 | if (newes->es_pblk == 0) { |
e30b5dca YZ |
4752 | ext4_es_find_delayed_extent_range(inode, newes->es_lblk, |
4753 | newes->es_lblk + newes->es_len - 1, &es); | |
4754 | ||
6d9c85eb | 4755 | /* |
69eb33dc | 4756 | * No extent in extent-tree contains block @newes->es_pblk, |
6d9c85eb | 4757 | * then the block may stay in 1)a hole or 2)delayed-extent. |
6d9c85eb | 4758 | */ |
06b0c886 | 4759 | if (es.es_len == 0) |
b3aff3e3 | 4760 | /* A hole found. */ |
91dd8c11 | 4761 | return 0; |
b3aff3e3 | 4762 | |
69eb33dc | 4763 | if (es.es_lblk > newes->es_lblk) { |
b3aff3e3 | 4764 | /* A hole found. */ |
69eb33dc ZL |
4765 | newes->es_len = min(es.es_lblk - newes->es_lblk, |
4766 | newes->es_len); | |
91dd8c11 | 4767 | return 0; |
6873fa0d | 4768 | } |
6d9c85eb | 4769 | |
69eb33dc | 4770 | newes->es_len = es.es_lblk + es.es_len - newes->es_lblk; |
6873fa0d ES |
4771 | } |
4772 | ||
69eb33dc | 4773 | block = newes->es_lblk + newes->es_len; |
e30b5dca | 4774 | ext4_es_find_delayed_extent_range(inode, block, EXT_MAX_BLOCKS, &es); |
be401363 ZL |
4775 | if (es.es_len == 0) |
4776 | next_del = EXT_MAX_BLOCKS; | |
4777 | else | |
4778 | next_del = es.es_lblk; | |
4779 | ||
91dd8c11 | 4780 | return next_del; |
6873fa0d | 4781 | } |
6873fa0d ES |
4782 | /* fiemap flags we can handle specified here */ |
4783 | #define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR) | |
4784 | ||
3a06d778 AK |
4785 | static int ext4_xattr_fiemap(struct inode *inode, |
4786 | struct fiemap_extent_info *fieinfo) | |
6873fa0d ES |
4787 | { |
4788 | __u64 physical = 0; | |
4789 | __u64 length; | |
4790 | __u32 flags = FIEMAP_EXTENT_LAST; | |
4791 | int blockbits = inode->i_sb->s_blocksize_bits; | |
4792 | int error = 0; | |
4793 | ||
4794 | /* in-inode? */ | |
19f5fb7a | 4795 | if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { |
6873fa0d ES |
4796 | struct ext4_iloc iloc; |
4797 | int offset; /* offset of xattr in inode */ | |
4798 | ||
4799 | error = ext4_get_inode_loc(inode, &iloc); | |
4800 | if (error) | |
4801 | return error; | |
a60697f4 | 4802 | physical = (__u64)iloc.bh->b_blocknr << blockbits; |
6873fa0d ES |
4803 | offset = EXT4_GOOD_OLD_INODE_SIZE + |
4804 | EXT4_I(inode)->i_extra_isize; | |
4805 | physical += offset; | |
4806 | length = EXT4_SB(inode->i_sb)->s_inode_size - offset; | |
4807 | flags |= FIEMAP_EXTENT_DATA_INLINE; | |
fd2dd9fb | 4808 | brelse(iloc.bh); |
6873fa0d | 4809 | } else { /* external block */ |
a60697f4 | 4810 | physical = (__u64)EXT4_I(inode)->i_file_acl << blockbits; |
6873fa0d ES |
4811 | length = inode->i_sb->s_blocksize; |
4812 | } | |
4813 | ||
4814 | if (physical) | |
4815 | error = fiemap_fill_next_extent(fieinfo, 0, physical, | |
4816 | length, flags); | |
4817 | return (error < 0 ? error : 0); | |
4818 | } | |
4819 | ||
4820 | int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, | |
4821 | __u64 start, __u64 len) | |
4822 | { | |
4823 | ext4_lblk_t start_blk; | |
6873fa0d ES |
4824 | int error = 0; |
4825 | ||
94191985 TM |
4826 | if (ext4_has_inline_data(inode)) { |
4827 | int has_inline = 1; | |
4828 | ||
4829 | error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline); | |
4830 | ||
4831 | if (has_inline) | |
4832 | return error; | |
4833 | } | |
4834 | ||
7869a4a6 TT |
4835 | if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) { |
4836 | error = ext4_ext_precache(inode); | |
4837 | if (error) | |
4838 | return error; | |
4839 | } | |
4840 | ||
6873fa0d | 4841 | /* fallback to generic here if not in extents fmt */ |
12e9b892 | 4842 | if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
6873fa0d ES |
4843 | return generic_block_fiemap(inode, fieinfo, start, len, |
4844 | ext4_get_block); | |
4845 | ||
4846 | if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS)) | |
4847 | return -EBADR; | |
4848 | ||
4849 | if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) { | |
4850 | error = ext4_xattr_fiemap(inode, fieinfo); | |
4851 | } else { | |
aca92ff6 LM |
4852 | ext4_lblk_t len_blks; |
4853 | __u64 last_blk; | |
4854 | ||
6873fa0d | 4855 | start_blk = start >> inode->i_sb->s_blocksize_bits; |
aca92ff6 | 4856 | last_blk = (start + len - 1) >> inode->i_sb->s_blocksize_bits; |
f17722f9 LC |
4857 | if (last_blk >= EXT_MAX_BLOCKS) |
4858 | last_blk = EXT_MAX_BLOCKS-1; | |
aca92ff6 | 4859 | len_blks = ((ext4_lblk_t) last_blk) - start_blk + 1; |
6873fa0d ES |
4860 | |
4861 | /* | |
91dd8c11 LC |
4862 | * Walk the extent tree gathering extent information |
4863 | * and pushing extents back to the user. | |
6873fa0d | 4864 | */ |
91dd8c11 LC |
4865 | error = ext4_fill_fiemap_extents(inode, start_blk, |
4866 | len_blks, fieinfo); | |
6873fa0d | 4867 | } |
107a7bd3 | 4868 | ext4_es_lru_add(inode); |
6873fa0d ES |
4869 | return error; |
4870 | } |