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32#include <linux/module.h>
33#include <linux/fs.h>
34#include <linux/time.h>
35#include <linux/jbd2.h>
36#include <linux/highuid.h>
37#include <linux/pagemap.h>
38#include <linux/quotaops.h>
39#include <linux/string.h>
40#include <linux/slab.h>
41#include <linux/falloc.h>
42#include <asm/uaccess.h>
43#include <linux/fiemap.h>
44#include "ext4_jbd2.h"
45#include "ext4_extents.h"
46
47
48
49
50
51
52ext4_fsblk_t ext_pblock(struct ext4_extent *ex)
53{
54 ext4_fsblk_t block;
55
56 block = le32_to_cpu(ex->ee_start_lo);
57 block |= ((ext4_fsblk_t) le16_to_cpu(ex->ee_start_hi) << 31) << 1;
58 return block;
59}
60
61
62
63
64
65ext4_fsblk_t idx_pblock(struct ext4_extent_idx *ix)
66{
67 ext4_fsblk_t block;
68
69 block = le32_to_cpu(ix->ei_leaf_lo);
70 block |= ((ext4_fsblk_t) le16_to_cpu(ix->ei_leaf_hi) << 31) << 1;
71 return block;
72}
73
74
75
76
77
78
79void ext4_ext_store_pblock(struct ext4_extent *ex, ext4_fsblk_t pb)
80{
81 ex->ee_start_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
82 ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
83}
84
85
86
87
88
89
90static void ext4_idx_store_pblock(struct ext4_extent_idx *ix, ext4_fsblk_t pb)
91{
92 ix->ei_leaf_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
93 ix->ei_leaf_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
94}
95
96static int ext4_ext_truncate_extend_restart(handle_t *handle,
97 struct inode *inode,
98 int needed)
99{
100 int err;
101
102 if (!ext4_handle_valid(handle))
103 return 0;
104 if (handle->h_buffer_credits > needed)
105 return 0;
106 err = ext4_journal_extend(handle, needed);
107 if (err <= 0)
108 return err;
109 err = ext4_truncate_restart_trans(handle, inode, needed);
110
111
112
113
114 ext4_ext_invalidate_cache(inode);
115
116 return err;
117}
118
119
120
121
122
123
124static int ext4_ext_get_access(handle_t *handle, struct inode *inode,
125 struct ext4_ext_path *path)
126{
127 if (path->p_bh) {
128
129 return ext4_journal_get_write_access(handle, path->p_bh);
130 }
131
132
133 return 0;
134}
135
136
137
138
139
140
141
142static int ext4_ext_dirty(handle_t *handle, struct inode *inode,
143 struct ext4_ext_path *path)
144{
145 int err;
146 if (path->p_bh) {
147
148 err = ext4_handle_dirty_metadata(handle, inode, path->p_bh);
149 } else {
150
151 err = ext4_mark_inode_dirty(handle, inode);
152 }
153 return err;
154}
155
156static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
157 struct ext4_ext_path *path,
158 ext4_lblk_t block)
159{
160 struct ext4_inode_info *ei = EXT4_I(inode);
161 ext4_fsblk_t bg_start;
162 ext4_fsblk_t last_block;
163 ext4_grpblk_t colour;
164 ext4_group_t block_group;
165 int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb));
166 int depth;
167
168 if (path) {
169 struct ext4_extent *ex;
170 depth = path->p_depth;
171
172
173 ex = path[depth].p_ext;
174 if (ex)
175 return ext_pblock(ex)+(block-le32_to_cpu(ex->ee_block));
176
177
178
179 if (path[depth].p_bh)
180 return path[depth].p_bh->b_blocknr;
181 }
182
183
184 block_group = ei->i_block_group;
185 if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) {
186
187
188
189
190
191
192
193
194 block_group &= ~(flex_size-1);
195 if (S_ISREG(inode->i_mode))
196 block_group++;
197 }
198 bg_start = (block_group * EXT4_BLOCKS_PER_GROUP(inode->i_sb)) +
199 le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_first_data_block);
200 last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
201
202
203
204
205
206 if (test_opt(inode->i_sb, DELALLOC))
207 return bg_start;
208
209 if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
210 colour = (current->pid % 16) *
211 (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
212 else
213 colour = (current->pid % 16) * ((last_block - bg_start) / 16);
214 return bg_start + colour + block;
215}
216
217
218
219
220static ext4_fsblk_t
221ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
222 struct ext4_ext_path *path,
223 struct ext4_extent *ex, int *err)
224{
225 ext4_fsblk_t goal, newblock;
226
227 goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
228 newblock = ext4_new_meta_blocks(handle, inode, goal, NULL, err);
229 return newblock;
230}
231
232static inline int ext4_ext_space_block(struct inode *inode, int check)
233{
234 int size;
235
236 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
237 / sizeof(struct ext4_extent);
238 if (!check) {
239#ifdef AGGRESSIVE_TEST
240 if (size > 6)
241 size = 6;
242#endif
243 }
244 return size;
245}
246
247static inline int ext4_ext_space_block_idx(struct inode *inode, int check)
248{
249 int size;
250
251 size = (inode->i_sb->s_blocksize - sizeof(struct ext4_extent_header))
252 / sizeof(struct ext4_extent_idx);
253 if (!check) {
254#ifdef AGGRESSIVE_TEST
255 if (size > 5)
256 size = 5;
257#endif
258 }
259 return size;
260}
261
262static inline int ext4_ext_space_root(struct inode *inode, int check)
263{
264 int size;
265
266 size = sizeof(EXT4_I(inode)->i_data);
267 size -= sizeof(struct ext4_extent_header);
268 size /= sizeof(struct ext4_extent);
269 if (!check) {
270#ifdef AGGRESSIVE_TEST
271 if (size > 3)
272 size = 3;
273#endif
274 }
275 return size;
276}
277
278static inline int ext4_ext_space_root_idx(struct inode *inode, int check)
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);
285 if (!check) {
286#ifdef AGGRESSIVE_TEST
287 if (size > 4)
288 size = 4;
289#endif
290 }
291 return size;
292}
293
294
295
296
297
298
299int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks)
300{
301 int lcap, icap, rcap, leafs, idxs, num;
302 int newextents = blocks;
303
304 rcap = ext4_ext_space_root_idx(inode, 0);
305 lcap = ext4_ext_space_block(inode, 0);
306 icap = ext4_ext_space_block_idx(inode, 0);
307
308
309 num = leafs = (newextents + lcap - 1) / lcap;
310
311
312
313
314
315 idxs = (leafs + icap - 1) / icap;
316 do {
317 num += idxs;
318 idxs = (idxs + icap - 1) / icap;
319 } while (idxs > rcap);
320
321 return num;
322}
323
324static int
325ext4_ext_max_entries(struct inode *inode, int depth)
326{
327 int max;
328
329 if (depth == ext_depth(inode)) {
330 if (depth == 0)
331 max = ext4_ext_space_root(inode, 1);
332 else
333 max = ext4_ext_space_root_idx(inode, 1);
334 } else {
335 if (depth == 0)
336 max = ext4_ext_space_block(inode, 1);
337 else
338 max = ext4_ext_space_block_idx(inode, 1);
339 }
340
341 return max;
342}
343
344static int ext4_valid_extent(struct inode *inode, struct ext4_extent *ext)
345{
346 ext4_fsblk_t block = ext_pblock(ext);
347 int len = ext4_ext_get_actual_len(ext);
348
349 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, len);
350}
351
352static int ext4_valid_extent_idx(struct inode *inode,
353 struct ext4_extent_idx *ext_idx)
354{
355 ext4_fsblk_t block = idx_pblock(ext_idx);
356
357 return ext4_data_block_valid(EXT4_SB(inode->i_sb), block, 1);
358}
359
360static int ext4_valid_extent_entries(struct inode *inode,
361 struct ext4_extent_header *eh,
362 int depth)
363{
364 struct ext4_extent *ext;
365 struct ext4_extent_idx *ext_idx;
366 unsigned short entries;
367 if (eh->eh_entries == 0)
368 return 1;
369
370 entries = le16_to_cpu(eh->eh_entries);
371
372 if (depth == 0) {
373
374 ext = EXT_FIRST_EXTENT(eh);
375 while (entries) {
376 if (!ext4_valid_extent(inode, ext))
377 return 0;
378 ext++;
379 entries--;
380 }
381 } else {
382 ext_idx = EXT_FIRST_INDEX(eh);
383 while (entries) {
384 if (!ext4_valid_extent_idx(inode, ext_idx))
385 return 0;
386 ext_idx++;
387 entries--;
388 }
389 }
390 return 1;
391}
392
393static int __ext4_ext_check(const char *function, struct inode *inode,
394 struct ext4_extent_header *eh,
395 int depth)
396{
397 const char *error_msg;
398 int max = 0;
399
400 if (unlikely(eh->eh_magic != EXT4_EXT_MAGIC)) {
401 error_msg = "invalid magic";
402 goto corrupted;
403 }
404 if (unlikely(le16_to_cpu(eh->eh_depth) != depth)) {
405 error_msg = "unexpected eh_depth";
406 goto corrupted;
407 }
408 if (unlikely(eh->eh_max == 0)) {
409 error_msg = "invalid eh_max";
410 goto corrupted;
411 }
412 max = ext4_ext_max_entries(inode, depth);
413 if (unlikely(le16_to_cpu(eh->eh_max) > max)) {
414 error_msg = "too large eh_max";
415 goto corrupted;
416 }
417 if (unlikely(le16_to_cpu(eh->eh_entries) > le16_to_cpu(eh->eh_max))) {
418 error_msg = "invalid eh_entries";
419 goto corrupted;
420 }
421 if (!ext4_valid_extent_entries(inode, eh, depth)) {
422 error_msg = "invalid extent entries";
423 goto corrupted;
424 }
425 return 0;
426
427corrupted:
428 ext4_error(inode->i_sb, function,
429 "bad header/extent in inode #%lu: %s - magic %x, "
430 "entries %u, max %u(%u), depth %u(%u)",
431 inode->i_ino, error_msg, le16_to_cpu(eh->eh_magic),
432 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max),
433 max, le16_to_cpu(eh->eh_depth), depth);
434
435 return -EIO;
436}
437
438#define ext4_ext_check(inode, eh, depth) \
439 __ext4_ext_check(__func__, inode, eh, depth)
440
441int ext4_ext_check_inode(struct inode *inode)
442{
443 return ext4_ext_check(inode, ext_inode_hdr(inode), ext_depth(inode));
444}
445
446#ifdef EXT_DEBUG
447static void ext4_ext_show_path(struct inode *inode, struct ext4_ext_path *path)
448{
449 int k, l = path->p_depth;
450
451 ext_debug("path:");
452 for (k = 0; k <= l; k++, path++) {
453 if (path->p_idx) {
454 ext_debug(" %d->%llu", le32_to_cpu(path->p_idx->ei_block),
455 idx_pblock(path->p_idx));
456 } else if (path->p_ext) {
457 ext_debug(" %d:[%d]%d:%llu ",
458 le32_to_cpu(path->p_ext->ee_block),
459 ext4_ext_is_uninitialized(path->p_ext),
460 ext4_ext_get_actual_len(path->p_ext),
461 ext_pblock(path->p_ext));
462 } else
463 ext_debug(" []");
464 }
465 ext_debug("\n");
466}
467
468static void ext4_ext_show_leaf(struct inode *inode, struct ext4_ext_path *path)
469{
470 int depth = ext_depth(inode);
471 struct ext4_extent_header *eh;
472 struct ext4_extent *ex;
473 int i;
474
475 if (!path)
476 return;
477
478 eh = path[depth].p_hdr;
479 ex = EXT_FIRST_EXTENT(eh);
480
481 ext_debug("Displaying leaf extents for inode %lu\n", inode->i_ino);
482
483 for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ex++) {
484 ext_debug("%d:[%d]%d:%llu ", le32_to_cpu(ex->ee_block),
485 ext4_ext_is_uninitialized(ex),
486 ext4_ext_get_actual_len(ex), ext_pblock(ex));
487 }
488 ext_debug("\n");
489}
490#else
491#define ext4_ext_show_path(inode, path)
492#define ext4_ext_show_leaf(inode, path)
493#endif
494
495void ext4_ext_drop_refs(struct ext4_ext_path *path)
496{
497 int depth = path->p_depth;
498 int i;
499
500 for (i = 0; i <= depth; i++, path++)
501 if (path->p_bh) {
502 brelse(path->p_bh);
503 path->p_bh = NULL;
504 }
505}
506
507
508
509
510
511
512static void
513ext4_ext_binsearch_idx(struct inode *inode,
514 struct ext4_ext_path *path, ext4_lblk_t block)
515{
516 struct ext4_extent_header *eh = path->p_hdr;
517 struct ext4_extent_idx *r, *l, *m;
518
519
520 ext_debug("binsearch for %u(idx): ", block);
521
522 l = EXT_FIRST_INDEX(eh) + 1;
523 r = EXT_LAST_INDEX(eh);
524 while (l <= r) {
525 m = l + (r - l) / 2;
526 if (block < le32_to_cpu(m->ei_block))
527 r = m - 1;
528 else
529 l = m + 1;
530 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ei_block),
531 m, le32_to_cpu(m->ei_block),
532 r, le32_to_cpu(r->ei_block));
533 }
534
535 path->p_idx = l - 1;
536 ext_debug(" -> %d->%lld ", le32_to_cpu(path->p_idx->ei_block),
537 idx_pblock(path->p_idx));
538
539#ifdef CHECK_BINSEARCH
540 {
541 struct ext4_extent_idx *chix, *ix;
542 int k;
543
544 chix = ix = EXT_FIRST_INDEX(eh);
545 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ix++) {
546 if (k != 0 &&
547 le32_to_cpu(ix->ei_block) <= le32_to_cpu(ix[-1].ei_block)) {
548 printk(KERN_DEBUG "k=%d, ix=0x%p, "
549 "first=0x%p\n", k,
550 ix, EXT_FIRST_INDEX(eh));
551 printk(KERN_DEBUG "%u <= %u\n",
552 le32_to_cpu(ix->ei_block),
553 le32_to_cpu(ix[-1].ei_block));
554 }
555 BUG_ON(k && le32_to_cpu(ix->ei_block)
556 <= le32_to_cpu(ix[-1].ei_block));
557 if (block < le32_to_cpu(ix->ei_block))
558 break;
559 chix = ix;
560 }
561 BUG_ON(chix != path->p_idx);
562 }
563#endif
564
565}
566
567
568
569
570
571
572static void
573ext4_ext_binsearch(struct inode *inode,
574 struct ext4_ext_path *path, ext4_lblk_t block)
575{
576 struct ext4_extent_header *eh = path->p_hdr;
577 struct ext4_extent *r, *l, *m;
578
579 if (eh->eh_entries == 0) {
580
581
582
583
584 return;
585 }
586
587 ext_debug("binsearch for %u: ", block);
588
589 l = EXT_FIRST_EXTENT(eh) + 1;
590 r = EXT_LAST_EXTENT(eh);
591
592 while (l <= r) {
593 m = l + (r - l) / 2;
594 if (block < le32_to_cpu(m->ee_block))
595 r = m - 1;
596 else
597 l = m + 1;
598 ext_debug("%p(%u):%p(%u):%p(%u) ", l, le32_to_cpu(l->ee_block),
599 m, le32_to_cpu(m->ee_block),
600 r, le32_to_cpu(r->ee_block));
601 }
602
603 path->p_ext = l - 1;
604 ext_debug(" -> %d:%llu:[%d]%d ",
605 le32_to_cpu(path->p_ext->ee_block),
606 ext_pblock(path->p_ext),
607 ext4_ext_is_uninitialized(path->p_ext),
608 ext4_ext_get_actual_len(path->p_ext));
609
610#ifdef CHECK_BINSEARCH
611 {
612 struct ext4_extent *chex, *ex;
613 int k;
614
615 chex = ex = EXT_FIRST_EXTENT(eh);
616 for (k = 0; k < le16_to_cpu(eh->eh_entries); k++, ex++) {
617 BUG_ON(k && le32_to_cpu(ex->ee_block)
618 <= le32_to_cpu(ex[-1].ee_block));
619 if (block < le32_to_cpu(ex->ee_block))
620 break;
621 chex = ex;
622 }
623 BUG_ON(chex != path->p_ext);
624 }
625#endif
626
627}
628
629int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
630{
631 struct ext4_extent_header *eh;
632
633 eh = ext_inode_hdr(inode);
634 eh->eh_depth = 0;
635 eh->eh_entries = 0;
636 eh->eh_magic = EXT4_EXT_MAGIC;
637 eh->eh_max = cpu_to_le16(ext4_ext_space_root(inode, 0));
638 ext4_mark_inode_dirty(handle, inode);
639 ext4_ext_invalidate_cache(inode);
640 return 0;
641}
642
643struct ext4_ext_path *
644ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
645 struct ext4_ext_path *path)
646{
647 struct ext4_extent_header *eh;
648 struct buffer_head *bh;
649 short int depth, i, ppos = 0, alloc = 0;
650
651 eh = ext_inode_hdr(inode);
652 depth = ext_depth(inode);
653
654
655 if (!path) {
656 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
657 GFP_NOFS);
658 if (!path)
659 return ERR_PTR(-ENOMEM);
660 alloc = 1;
661 }
662 path[0].p_hdr = eh;
663 path[0].p_bh = NULL;
664
665 i = depth;
666
667 while (i) {
668 int need_to_validate = 0;
669
670 ext_debug("depth %d: num %d, max %d\n",
671 ppos, le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
672
673 ext4_ext_binsearch_idx(inode, path + ppos, block);
674 path[ppos].p_block = idx_pblock(path[ppos].p_idx);
675 path[ppos].p_depth = i;
676 path[ppos].p_ext = NULL;
677
678 bh = sb_getblk(inode->i_sb, path[ppos].p_block);
679 if (unlikely(!bh))
680 goto err;
681 if (!bh_uptodate_or_lock(bh)) {
682 if (bh_submit_read(bh) < 0) {
683 put_bh(bh);
684 goto err;
685 }
686
687 need_to_validate = 1;
688 }
689 eh = ext_block_hdr(bh);
690 ppos++;
691 BUG_ON(ppos > depth);
692 path[ppos].p_bh = bh;
693 path[ppos].p_hdr = eh;
694 i--;
695
696 if (need_to_validate && ext4_ext_check(inode, eh, i))
697 goto err;
698 }
699
700 path[ppos].p_depth = i;
701 path[ppos].p_ext = NULL;
702 path[ppos].p_idx = NULL;
703
704
705 ext4_ext_binsearch(inode, path + ppos, block);
706
707 if (path[ppos].p_ext)
708 path[ppos].p_block = ext_pblock(path[ppos].p_ext);
709
710 ext4_ext_show_path(inode, path);
711
712 return path;
713
714err:
715 ext4_ext_drop_refs(path);
716 if (alloc)
717 kfree(path);
718 return ERR_PTR(-EIO);
719}
720
721
722
723
724
725
726int ext4_ext_insert_index(handle_t *handle, struct inode *inode,
727 struct ext4_ext_path *curp,
728 int logical, ext4_fsblk_t ptr)
729{
730 struct ext4_extent_idx *ix;
731 int len, err;
732
733 err = ext4_ext_get_access(handle, inode, curp);
734 if (err)
735 return err;
736
737 BUG_ON(logical == le32_to_cpu(curp->p_idx->ei_block));
738 len = EXT_MAX_INDEX(curp->p_hdr) - curp->p_idx;
739 if (logical > le32_to_cpu(curp->p_idx->ei_block)) {
740
741 if (curp->p_idx != EXT_LAST_INDEX(curp->p_hdr)) {
742 len = (len - 1) * sizeof(struct ext4_extent_idx);
743 len = len < 0 ? 0 : len;
744 ext_debug("insert new index %d after: %llu. "
745 "move %d from 0x%p to 0x%p\n",
746 logical, ptr, len,
747 (curp->p_idx + 1), (curp->p_idx + 2));
748 memmove(curp->p_idx + 2, curp->p_idx + 1, len);
749 }
750 ix = curp->p_idx + 1;
751 } else {
752
753 len = len * sizeof(struct ext4_extent_idx);
754 len = len < 0 ? 0 : len;
755 ext_debug("insert new index %d before: %llu. "
756 "move %d from 0x%p to 0x%p\n",
757 logical, ptr, len,
758 curp->p_idx, (curp->p_idx + 1));
759 memmove(curp->p_idx + 1, curp->p_idx, len);
760 ix = curp->p_idx;
761 }
762
763 ix->ei_block = cpu_to_le32(logical);
764 ext4_idx_store_pblock(ix, ptr);
765 le16_add_cpu(&curp->p_hdr->eh_entries, 1);
766
767 BUG_ON(le16_to_cpu(curp->p_hdr->eh_entries)
768 > le16_to_cpu(curp->p_hdr->eh_max));
769 BUG_ON(ix > EXT_LAST_INDEX(curp->p_hdr));
770
771 err = ext4_ext_dirty(handle, inode, curp);
772 ext4_std_error(inode->i_sb, err);
773
774 return err;
775}
776
777
778
779
780
781
782
783
784
785
786
787static int ext4_ext_split(handle_t *handle, struct inode *inode,
788 struct ext4_ext_path *path,
789 struct ext4_extent *newext, int at)
790{
791 struct buffer_head *bh = NULL;
792 int depth = ext_depth(inode);
793 struct ext4_extent_header *neh;
794 struct ext4_extent_idx *fidx;
795 struct ext4_extent *ex;
796 int i = at, k, m, a;
797 ext4_fsblk_t newblock, oldblock;
798 __le32 border;
799 ext4_fsblk_t *ablocks = NULL;
800 int err = 0;
801
802
803
804
805
806
807 BUG_ON(path[depth].p_ext > EXT_MAX_EXTENT(path[depth].p_hdr));
808 if (path[depth].p_ext != EXT_MAX_EXTENT(path[depth].p_hdr)) {
809 border = path[depth].p_ext[1].ee_block;
810 ext_debug("leaf will be split."
811 " next leaf starts at %d\n",
812 le32_to_cpu(border));
813 } else {
814 border = newext->ee_block;
815 ext_debug("leaf will be added."
816 " next leaf starts at %d\n",
817 le32_to_cpu(border));
818 }
819
820
821
822
823
824
825
826
827
828
829
830
831
832 ablocks = kzalloc(sizeof(ext4_fsblk_t) * depth, GFP_NOFS);
833 if (!ablocks)
834 return -ENOMEM;
835
836
837 ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
838 for (a = 0; a < depth - at; a++) {
839 newblock = ext4_ext_new_meta_block(handle, inode, path,
840 newext, &err);
841 if (newblock == 0)
842 goto cleanup;
843 ablocks[a] = newblock;
844 }
845
846
847 newblock = ablocks[--a];
848 BUG_ON(newblock == 0);
849 bh = sb_getblk(inode->i_sb, newblock);
850 if (!bh) {
851 err = -EIO;
852 goto cleanup;
853 }
854 lock_buffer(bh);
855
856 err = ext4_journal_get_create_access(handle, bh);
857 if (err)
858 goto cleanup;
859
860 neh = ext_block_hdr(bh);
861 neh->eh_entries = 0;
862 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
863 neh->eh_magic = EXT4_EXT_MAGIC;
864 neh->eh_depth = 0;
865 ex = EXT_FIRST_EXTENT(neh);
866
867
868 BUG_ON(path[depth].p_hdr->eh_entries != path[depth].p_hdr->eh_max);
869
870
871 m = 0;
872 path[depth].p_ext++;
873 while (path[depth].p_ext <=
874 EXT_MAX_EXTENT(path[depth].p_hdr)) {
875 ext_debug("move %d:%llu:[%d]%d in new leaf %llu\n",
876 le32_to_cpu(path[depth].p_ext->ee_block),
877 ext_pblock(path[depth].p_ext),
878 ext4_ext_is_uninitialized(path[depth].p_ext),
879 ext4_ext_get_actual_len(path[depth].p_ext),
880 newblock);
881
882
883
884 path[depth].p_ext++;
885 m++;
886 }
887 if (m) {
888 memmove(ex, path[depth].p_ext-m, sizeof(struct ext4_extent)*m);
889 le16_add_cpu(&neh->eh_entries, m);
890 }
891
892 set_buffer_uptodate(bh);
893 unlock_buffer(bh);
894
895 err = ext4_handle_dirty_metadata(handle, inode, bh);
896 if (err)
897 goto cleanup;
898 brelse(bh);
899 bh = NULL;
900
901
902 if (m) {
903 err = ext4_ext_get_access(handle, inode, path + depth);
904 if (err)
905 goto cleanup;
906 le16_add_cpu(&path[depth].p_hdr->eh_entries, -m);
907 err = ext4_ext_dirty(handle, inode, path + depth);
908 if (err)
909 goto cleanup;
910
911 }
912
913
914 k = depth - at - 1;
915 BUG_ON(k < 0);
916 if (k)
917 ext_debug("create %d intermediate indices\n", k);
918
919
920 i = depth - 1;
921 while (k--) {
922 oldblock = newblock;
923 newblock = ablocks[--a];
924 bh = sb_getblk(inode->i_sb, newblock);
925 if (!bh) {
926 err = -EIO;
927 goto cleanup;
928 }
929 lock_buffer(bh);
930
931 err = ext4_journal_get_create_access(handle, bh);
932 if (err)
933 goto cleanup;
934
935 neh = ext_block_hdr(bh);
936 neh->eh_entries = cpu_to_le16(1);
937 neh->eh_magic = EXT4_EXT_MAGIC;
938 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
939 neh->eh_depth = cpu_to_le16(depth - i);
940 fidx = EXT_FIRST_INDEX(neh);
941 fidx->ei_block = border;
942 ext4_idx_store_pblock(fidx, oldblock);
943
944 ext_debug("int.index at %d (block %llu): %u -> %llu\n",
945 i, newblock, le32_to_cpu(border), oldblock);
946
947 m = 0;
948 path[i].p_idx++;
949
950 ext_debug("cur 0x%p, last 0x%p\n", path[i].p_idx,
951 EXT_MAX_INDEX(path[i].p_hdr));
952 BUG_ON(EXT_MAX_INDEX(path[i].p_hdr) !=
953 EXT_LAST_INDEX(path[i].p_hdr));
954 while (path[i].p_idx <= EXT_MAX_INDEX(path[i].p_hdr)) {
955 ext_debug("%d: move %d:%llu in new index %llu\n", i,
956 le32_to_cpu(path[i].p_idx->ei_block),
957 idx_pblock(path[i].p_idx),
958 newblock);
959
960
961
962
963 path[i].p_idx++;
964 m++;
965 }
966 if (m) {
967 memmove(++fidx, path[i].p_idx - m,
968 sizeof(struct ext4_extent_idx) * m);
969 le16_add_cpu(&neh->eh_entries, m);
970 }
971 set_buffer_uptodate(bh);
972 unlock_buffer(bh);
973
974 err = ext4_handle_dirty_metadata(handle, inode, bh);
975 if (err)
976 goto cleanup;
977 brelse(bh);
978 bh = NULL;
979
980
981 if (m) {
982 err = ext4_ext_get_access(handle, inode, path + i);
983 if (err)
984 goto cleanup;
985 le16_add_cpu(&path[i].p_hdr->eh_entries, -m);
986 err = ext4_ext_dirty(handle, inode, path + i);
987 if (err)
988 goto cleanup;
989 }
990
991 i--;
992 }
993
994
995 err = ext4_ext_insert_index(handle, inode, path + at,
996 le32_to_cpu(border), newblock);
997
998cleanup:
999 if (bh) {
1000 if (buffer_locked(bh))
1001 unlock_buffer(bh);
1002 brelse(bh);
1003 }
1004
1005 if (err) {
1006
1007 for (i = 0; i < depth; i++) {
1008 if (!ablocks[i])
1009 continue;
1010 ext4_free_blocks(handle, inode, ablocks[i], 1, 1);
1011 }
1012 }
1013 kfree(ablocks);
1014
1015 return err;
1016}
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
1027 struct ext4_ext_path *path,
1028 struct ext4_extent *newext)
1029{
1030 struct ext4_ext_path *curp = path;
1031 struct ext4_extent_header *neh;
1032 struct ext4_extent_idx *fidx;
1033 struct buffer_head *bh;
1034 ext4_fsblk_t newblock;
1035 int err = 0;
1036
1037 newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
1038 if (newblock == 0)
1039 return err;
1040
1041 bh = sb_getblk(inode->i_sb, newblock);
1042 if (!bh) {
1043 err = -EIO;
1044 ext4_std_error(inode->i_sb, err);
1045 return err;
1046 }
1047 lock_buffer(bh);
1048
1049 err = ext4_journal_get_create_access(handle, bh);
1050 if (err) {
1051 unlock_buffer(bh);
1052 goto out;
1053 }
1054
1055
1056 memmove(bh->b_data, curp->p_hdr, sizeof(EXT4_I(inode)->i_data));
1057
1058
1059 neh = ext_block_hdr(bh);
1060
1061
1062 if (ext_depth(inode))
1063 neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
1064 else
1065 neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
1066 neh->eh_magic = EXT4_EXT_MAGIC;
1067 set_buffer_uptodate(bh);
1068 unlock_buffer(bh);
1069
1070 err = ext4_handle_dirty_metadata(handle, inode, bh);
1071 if (err)
1072 goto out;
1073
1074
1075 err = ext4_ext_get_access(handle, inode, curp);
1076 if (err)
1077 goto out;
1078
1079 curp->p_hdr->eh_magic = EXT4_EXT_MAGIC;
1080 curp->p_hdr->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
1081 curp->p_hdr->eh_entries = cpu_to_le16(1);
1082 curp->p_idx = EXT_FIRST_INDEX(curp->p_hdr);
1083
1084 if (path[0].p_hdr->eh_depth)
1085 curp->p_idx->ei_block =
1086 EXT_FIRST_INDEX(path[0].p_hdr)->ei_block;
1087 else
1088 curp->p_idx->ei_block =
1089 EXT_FIRST_EXTENT(path[0].p_hdr)->ee_block;
1090 ext4_idx_store_pblock(curp->p_idx, newblock);
1091
1092 neh = ext_inode_hdr(inode);
1093 fidx = EXT_FIRST_INDEX(neh);
1094 ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
1095 le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
1096 le32_to_cpu(fidx->ei_block), idx_pblock(fidx));
1097
1098 neh->eh_depth = cpu_to_le16(path->p_depth + 1);
1099 err = ext4_ext_dirty(handle, inode, curp);
1100out:
1101 brelse(bh);
1102
1103 return err;
1104}
1105
1106
1107
1108
1109
1110
1111static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
1112 struct ext4_ext_path *path,
1113 struct ext4_extent *newext)
1114{
1115 struct ext4_ext_path *curp;
1116 int depth, i, err = 0;
1117
1118repeat:
1119 i = depth = ext_depth(inode);
1120
1121
1122 curp = path + depth;
1123 while (i > 0 && !EXT_HAS_FREE_INDEX(curp)) {
1124 i--;
1125 curp--;
1126 }
1127
1128
1129
1130 if (EXT_HAS_FREE_INDEX(curp)) {
1131
1132
1133 err = ext4_ext_split(handle, inode, path, newext, i);
1134 if (err)
1135 goto out;
1136
1137
1138 ext4_ext_drop_refs(path);
1139 path = ext4_ext_find_extent(inode,
1140 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
1141 path);
1142 if (IS_ERR(path))
1143 err = PTR_ERR(path);
1144 } else {
1145
1146 err = ext4_ext_grow_indepth(handle, inode, path, newext);
1147 if (err)
1148 goto out;
1149
1150
1151 ext4_ext_drop_refs(path);
1152 path = ext4_ext_find_extent(inode,
1153 (ext4_lblk_t)le32_to_cpu(newext->ee_block),
1154 path);
1155 if (IS_ERR(path)) {
1156 err = PTR_ERR(path);
1157 goto out;
1158 }
1159
1160
1161
1162
1163
1164 depth = ext_depth(inode);
1165 if (path[depth].p_hdr->eh_entries == path[depth].p_hdr->eh_max) {
1166
1167 goto repeat;
1168 }
1169 }
1170
1171out:
1172 return err;
1173}
1174
1175
1176
1177
1178
1179
1180
1181
1182int
1183ext4_ext_search_left(struct inode *inode, struct ext4_ext_path *path,
1184 ext4_lblk_t *logical, ext4_fsblk_t *phys)
1185{
1186 struct ext4_extent_idx *ix;
1187 struct ext4_extent *ex;
1188 int depth, ee_len;
1189
1190 BUG_ON(path == NULL);
1191 depth = path->p_depth;
1192 *phys = 0;
1193
1194 if (depth == 0 && path->p_ext == NULL)
1195 return 0;
1196
1197
1198
1199
1200
1201 ex = path[depth].p_ext;
1202 ee_len = ext4_ext_get_actual_len(ex);
1203 if (*logical < le32_to_cpu(ex->ee_block)) {
1204 BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
1205 while (--depth >= 0) {
1206 ix = path[depth].p_idx;
1207 BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
1208 }
1209 return 0;
1210 }
1211
1212 BUG_ON(*logical < (le32_to_cpu(ex->ee_block) + ee_len));
1213
1214 *logical = le32_to_cpu(ex->ee_block) + ee_len - 1;
1215 *phys = ext_pblock(ex) + ee_len - 1;
1216 return 0;
1217}
1218
1219
1220
1221
1222
1223
1224
1225
1226int
1227ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path,
1228 ext4_lblk_t *logical, ext4_fsblk_t *phys)
1229{
1230 struct buffer_head *bh = NULL;
1231 struct ext4_extent_header *eh;
1232 struct ext4_extent_idx *ix;
1233 struct ext4_extent *ex;
1234 ext4_fsblk_t block;
1235 int depth;
1236 int ee_len;
1237
1238 BUG_ON(path == NULL);
1239 depth = path->p_depth;
1240 *phys = 0;
1241
1242 if (depth == 0 && path->p_ext == NULL)
1243 return 0;
1244
1245
1246
1247
1248
1249 ex = path[depth].p_ext;
1250 ee_len = ext4_ext_get_actual_len(ex);
1251 if (*logical < le32_to_cpu(ex->ee_block)) {
1252 BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
1253 while (--depth >= 0) {
1254 ix = path[depth].p_idx;
1255 BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
1256 }
1257 *logical = le32_to_cpu(ex->ee_block);
1258 *phys = ext_pblock(ex);
1259 return 0;
1260 }
1261
1262 BUG_ON(*logical < (le32_to_cpu(ex->ee_block) + ee_len));
1263
1264 if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
1265
1266 ex++;
1267 *logical = le32_to_cpu(ex->ee_block);
1268 *phys = ext_pblock(ex);
1269 return 0;
1270 }
1271
1272
1273 while (--depth >= 0) {
1274 ix = path[depth].p_idx;
1275 if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
1276 goto got_index;
1277 }
1278
1279
1280 return 0;
1281
1282got_index:
1283
1284
1285
1286 ix++;
1287 block = idx_pblock(ix);
1288 while (++depth < path->p_depth) {
1289 bh = sb_bread(inode->i_sb, block);
1290 if (bh == NULL)
1291 return -EIO;
1292 eh = ext_block_hdr(bh);
1293
1294 if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
1295 put_bh(bh);
1296 return -EIO;
1297 }
1298 ix = EXT_FIRST_INDEX(eh);
1299 block = idx_pblock(ix);
1300 put_bh(bh);
1301 }
1302
1303 bh = sb_bread(inode->i_sb, block);
1304 if (bh == NULL)
1305 return -EIO;
1306 eh = ext_block_hdr(bh);
1307 if (ext4_ext_check(inode, eh, path->p_depth - depth)) {
1308 put_bh(bh);
1309 return -EIO;
1310 }
1311 ex = EXT_FIRST_EXTENT(eh);
1312 *logical = le32_to_cpu(ex->ee_block);
1313 *phys = ext_pblock(ex);
1314 put_bh(bh);
1315 return 0;
1316}
1317
1318
1319
1320
1321
1322
1323
1324
1325static ext4_lblk_t
1326ext4_ext_next_allocated_block(struct ext4_ext_path *path)
1327{
1328 int depth;
1329
1330 BUG_ON(path == NULL);
1331 depth = path->p_depth;
1332
1333 if (depth == 0 && path->p_ext == NULL)
1334 return EXT_MAX_BLOCK;
1335
1336 while (depth >= 0) {
1337 if (depth == path->p_depth) {
1338
1339 if (path[depth].p_ext !=
1340 EXT_LAST_EXTENT(path[depth].p_hdr))
1341 return le32_to_cpu(path[depth].p_ext[1].ee_block);
1342 } else {
1343
1344 if (path[depth].p_idx !=
1345 EXT_LAST_INDEX(path[depth].p_hdr))
1346 return le32_to_cpu(path[depth].p_idx[1].ei_block);
1347 }
1348 depth--;
1349 }
1350
1351 return EXT_MAX_BLOCK;
1352}
1353
1354
1355
1356
1357
1358static ext4_lblk_t ext4_ext_next_leaf_block(struct inode *inode,
1359 struct ext4_ext_path *path)
1360{
1361 int depth;
1362
1363 BUG_ON(path == NULL);
1364 depth = path->p_depth;
1365
1366
1367 if (depth == 0)
1368 return EXT_MAX_BLOCK;
1369
1370
1371 depth--;
1372
1373 while (depth >= 0) {
1374 if (path[depth].p_idx !=
1375 EXT_LAST_INDEX(path[depth].p_hdr))
1376 return (ext4_lblk_t)
1377 le32_to_cpu(path[depth].p_idx[1].ei_block);
1378 depth--;
1379 }
1380
1381 return EXT_MAX_BLOCK;
1382}
1383
1384
1385
1386
1387
1388
1389
1390static int ext4_ext_correct_indexes(handle_t *handle, struct inode *inode,
1391 struct ext4_ext_path *path)
1392{
1393 struct ext4_extent_header *eh;
1394 int depth = ext_depth(inode);
1395 struct ext4_extent *ex;
1396 __le32 border;
1397 int k, err = 0;
1398
1399 eh = path[depth].p_hdr;
1400 ex = path[depth].p_ext;
1401 BUG_ON(ex == NULL);
1402 BUG_ON(eh == NULL);
1403
1404 if (depth == 0) {
1405
1406 return 0;
1407 }
1408
1409 if (ex != EXT_FIRST_EXTENT(eh)) {
1410
1411 return 0;
1412 }
1413
1414
1415
1416
1417 k = depth - 1;
1418 border = path[depth].p_ext->ee_block;
1419 err = ext4_ext_get_access(handle, inode, path + k);
1420 if (err)
1421 return err;
1422 path[k].p_idx->ei_block = border;
1423 err = ext4_ext_dirty(handle, inode, path + k);
1424 if (err)
1425 return err;
1426
1427 while (k--) {
1428
1429 if (path[k+1].p_idx != EXT_FIRST_INDEX(path[k+1].p_hdr))
1430 break;
1431 err = ext4_ext_get_access(handle, inode, path + k);
1432 if (err)
1433 break;
1434 path[k].p_idx->ei_block = border;
1435 err = ext4_ext_dirty(handle, inode, path + k);
1436 if (err)
1437 break;
1438 }
1439
1440 return err;
1441}
1442
1443int
1444ext4_can_extents_be_merged(struct inode *inode, struct ext4_extent *ex1,
1445 struct ext4_extent *ex2)
1446{
1447 unsigned short ext1_ee_len, ext2_ee_len, max_len;
1448
1449
1450
1451
1452
1453 if (ext4_ext_is_uninitialized(ex1) ^ ext4_ext_is_uninitialized(ex2))
1454 return 0;
1455
1456 if (ext4_ext_is_uninitialized(ex1))
1457 max_len = EXT_UNINIT_MAX_LEN;
1458 else
1459 max_len = EXT_INIT_MAX_LEN;
1460
1461 ext1_ee_len = ext4_ext_get_actual_len(ex1);
1462 ext2_ee_len = ext4_ext_get_actual_len(ex2);
1463
1464 if (le32_to_cpu(ex1->ee_block) + ext1_ee_len !=
1465 le32_to_cpu(ex2->ee_block))
1466 return 0;
1467
1468
1469
1470
1471
1472
1473 if (ext1_ee_len + ext2_ee_len > max_len)
1474 return 0;
1475#ifdef AGGRESSIVE_TEST
1476 if (ext1_ee_len >= 4)
1477 return 0;
1478#endif
1479
1480 if (ext_pblock(ex1) + ext1_ee_len == ext_pblock(ex2))
1481 return 1;
1482 return 0;
1483}
1484
1485
1486
1487
1488
1489
1490
1491
1492int ext4_ext_try_to_merge(struct inode *inode,
1493 struct ext4_ext_path *path,
1494 struct ext4_extent *ex)
1495{
1496 struct ext4_extent_header *eh;
1497 unsigned int depth, len;
1498 int merge_done = 0;
1499 int uninitialized = 0;
1500
1501 depth = ext_depth(inode);
1502 BUG_ON(path[depth].p_hdr == NULL);
1503 eh = path[depth].p_hdr;
1504
1505 while (ex < EXT_LAST_EXTENT(eh)) {
1506 if (!ext4_can_extents_be_merged(inode, ex, ex + 1))
1507 break;
1508
1509 if (ext4_ext_is_uninitialized(ex))
1510 uninitialized = 1;
1511 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1512 + ext4_ext_get_actual_len(ex + 1));
1513 if (uninitialized)
1514 ext4_ext_mark_uninitialized(ex);
1515
1516 if (ex + 1 < EXT_LAST_EXTENT(eh)) {
1517 len = (EXT_LAST_EXTENT(eh) - ex - 1)
1518 * sizeof(struct ext4_extent);
1519 memmove(ex + 1, ex + 2, len);
1520 }
1521 le16_add_cpu(&eh->eh_entries, -1);
1522 merge_done = 1;
1523 WARN_ON(eh->eh_entries == 0);
1524 if (!eh->eh_entries)
1525 ext4_error(inode->i_sb, "ext4_ext_try_to_merge",
1526 "inode#%lu, eh->eh_entries = 0!", inode->i_ino);
1527 }
1528
1529 return merge_done;
1530}
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540unsigned int ext4_ext_check_overlap(struct inode *inode,
1541 struct ext4_extent *newext,
1542 struct ext4_ext_path *path)
1543{
1544 ext4_lblk_t b1, b2;
1545 unsigned int depth, len1;
1546 unsigned int ret = 0;
1547
1548 b1 = le32_to_cpu(newext->ee_block);
1549 len1 = ext4_ext_get_actual_len(newext);
1550 depth = ext_depth(inode);
1551 if (!path[depth].p_ext)
1552 goto out;
1553 b2 = le32_to_cpu(path[depth].p_ext->ee_block);
1554
1555
1556
1557
1558
1559 if (b2 < b1) {
1560 b2 = ext4_ext_next_allocated_block(path);
1561 if (b2 == EXT_MAX_BLOCK)
1562 goto out;
1563 }
1564
1565
1566 if (b1 + len1 < b1) {
1567 len1 = EXT_MAX_BLOCK - b1;
1568 newext->ee_len = cpu_to_le16(len1);
1569 ret = 1;
1570 }
1571
1572
1573 if (b1 + len1 > b2) {
1574 newext->ee_len = cpu_to_le16(b2 - b1);
1575 ret = 1;
1576 }
1577out:
1578 return ret;
1579}
1580
1581
1582
1583
1584
1585
1586
1587int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
1588 struct ext4_ext_path *path,
1589 struct ext4_extent *newext, int flag)
1590{
1591 struct ext4_extent_header *eh;
1592 struct ext4_extent *ex, *fex;
1593 struct ext4_extent *nearex;
1594 struct ext4_ext_path *npath = NULL;
1595 int depth, len, err;
1596 ext4_lblk_t next;
1597 unsigned uninitialized = 0;
1598
1599 BUG_ON(ext4_ext_get_actual_len(newext) == 0);
1600 depth = ext_depth(inode);
1601 ex = path[depth].p_ext;
1602 BUG_ON(path[depth].p_hdr == NULL);
1603
1604
1605 if (ex && (flag != EXT4_GET_BLOCKS_DIO_CREATE_EXT)
1606 && ext4_can_extents_be_merged(inode, ex, newext)) {
1607 ext_debug("append [%d]%d block to %d:[%d]%d (from %llu)\n",
1608 ext4_ext_is_uninitialized(newext),
1609 ext4_ext_get_actual_len(newext),
1610 le32_to_cpu(ex->ee_block),
1611 ext4_ext_is_uninitialized(ex),
1612 ext4_ext_get_actual_len(ex), ext_pblock(ex));
1613 err = ext4_ext_get_access(handle, inode, path + depth);
1614 if (err)
1615 return err;
1616
1617
1618
1619
1620
1621
1622 if (ext4_ext_is_uninitialized(ex))
1623 uninitialized = 1;
1624 ex->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ex)
1625 + ext4_ext_get_actual_len(newext));
1626 if (uninitialized)
1627 ext4_ext_mark_uninitialized(ex);
1628 eh = path[depth].p_hdr;
1629 nearex = ex;
1630 goto merge;
1631 }
1632
1633repeat:
1634 depth = ext_depth(inode);
1635 eh = path[depth].p_hdr;
1636 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max))
1637 goto has_space;
1638
1639
1640 fex = EXT_LAST_EXTENT(eh);
1641 next = ext4_ext_next_leaf_block(inode, path);
1642 if (le32_to_cpu(newext->ee_block) > le32_to_cpu(fex->ee_block)
1643 && next != EXT_MAX_BLOCK) {
1644 ext_debug("next leaf block - %d\n", next);
1645 BUG_ON(npath != NULL);
1646 npath = ext4_ext_find_extent(inode, next, NULL);
1647 if (IS_ERR(npath))
1648 return PTR_ERR(npath);
1649 BUG_ON(npath->p_depth != path->p_depth);
1650 eh = npath[depth].p_hdr;
1651 if (le16_to_cpu(eh->eh_entries) < le16_to_cpu(eh->eh_max)) {
1652 ext_debug("next leaf isnt full(%d)\n",
1653 le16_to_cpu(eh->eh_entries));
1654 path = npath;
1655 goto repeat;
1656 }
1657 ext_debug("next leaf has no free space(%d,%d)\n",
1658 le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
1659 }
1660
1661
1662
1663
1664
1665 err = ext4_ext_create_new_leaf(handle, inode, path, newext);
1666 if (err)
1667 goto cleanup;
1668 depth = ext_depth(inode);
1669 eh = path[depth].p_hdr;
1670
1671has_space:
1672 nearex = path[depth].p_ext;
1673
1674 err = ext4_ext_get_access(handle, inode, path + depth);
1675 if (err)
1676 goto cleanup;
1677
1678 if (!nearex) {
1679
1680 ext_debug("first extent in the leaf: %d:%llu:[%d]%d\n",
1681 le32_to_cpu(newext->ee_block),
1682 ext_pblock(newext),
1683 ext4_ext_is_uninitialized(newext),
1684 ext4_ext_get_actual_len(newext));
1685 path[depth].p_ext = EXT_FIRST_EXTENT(eh);
1686 } else if (le32_to_cpu(newext->ee_block)
1687 > le32_to_cpu(nearex->ee_block)) {
1688
1689 if (nearex != EXT_LAST_EXTENT(eh)) {
1690 len = EXT_MAX_EXTENT(eh) - nearex;
1691 len = (len - 1) * sizeof(struct ext4_extent);
1692 len = len < 0 ? 0 : len;
1693 ext_debug("insert %d:%llu:[%d]%d after: nearest 0x%p, "
1694 "move %d from 0x%p to 0x%p\n",
1695 le32_to_cpu(newext->ee_block),
1696 ext_pblock(newext),
1697 ext4_ext_is_uninitialized(newext),
1698 ext4_ext_get_actual_len(newext),
1699 nearex, len, nearex + 1, nearex + 2);
1700 memmove(nearex + 2, nearex + 1, len);
1701 }
1702 path[depth].p_ext = nearex + 1;
1703 } else {
1704 BUG_ON(newext->ee_block == nearex->ee_block);
1705 len = (EXT_MAX_EXTENT(eh) - nearex) * sizeof(struct ext4_extent);
1706 len = len < 0 ? 0 : len;
1707 ext_debug("insert %d:%llu:[%d]%d before: nearest 0x%p, "
1708 "move %d from 0x%p to 0x%p\n",
1709 le32_to_cpu(newext->ee_block),
1710 ext_pblock(newext),
1711 ext4_ext_is_uninitialized(newext),
1712 ext4_ext_get_actual_len(newext),
1713 nearex, len, nearex + 1, nearex + 2);
1714 memmove(nearex + 1, nearex, len);
1715 path[depth].p_ext = nearex;
1716 }
1717
1718 le16_add_cpu(&eh->eh_entries, 1);
1719 nearex = path[depth].p_ext;
1720 nearex->ee_block = newext->ee_block;
1721 ext4_ext_store_pblock(nearex, ext_pblock(newext));
1722 nearex->ee_len = newext->ee_len;
1723
1724merge:
1725
1726 if (flag != EXT4_GET_BLOCKS_DIO_CREATE_EXT)
1727 ext4_ext_try_to_merge(inode, path, nearex);
1728
1729
1730
1731
1732 err = ext4_ext_correct_indexes(handle, inode, path);
1733 if (err)
1734 goto cleanup;
1735
1736 err = ext4_ext_dirty(handle, inode, path + depth);
1737
1738cleanup:
1739 if (npath) {
1740 ext4_ext_drop_refs(npath);
1741 kfree(npath);
1742 }
1743 ext4_ext_invalidate_cache(inode);
1744 return err;
1745}
1746
1747int ext4_ext_walk_space(struct inode *inode, ext4_lblk_t block,
1748 ext4_lblk_t num, ext_prepare_callback func,
1749 void *cbdata)
1750{
1751 struct ext4_ext_path *path = NULL;
1752 struct ext4_ext_cache cbex;
1753 struct ext4_extent *ex;
1754 ext4_lblk_t next, start = 0, end = 0;
1755 ext4_lblk_t last = block + num;
1756 int depth, exists, err = 0;
1757
1758 BUG_ON(func == NULL);
1759 BUG_ON(inode == NULL);
1760
1761 while (block < last && block != EXT_MAX_BLOCK) {
1762 num = last - block;
1763
1764 path = ext4_ext_find_extent(inode, block, path);
1765 if (IS_ERR(path)) {
1766 err = PTR_ERR(path);
1767 path = NULL;
1768 break;
1769 }
1770
1771 depth = ext_depth(inode);
1772 BUG_ON(path[depth].p_hdr == NULL);
1773 ex = path[depth].p_ext;
1774 next = ext4_ext_next_allocated_block(path);
1775
1776 exists = 0;
1777 if (!ex) {
1778
1779
1780 start = block;
1781 end = block + num;
1782 } else if (le32_to_cpu(ex->ee_block) > block) {
1783
1784 start = block;
1785 end = le32_to_cpu(ex->ee_block);
1786 if (block + num < end)
1787 end = block + num;
1788 } else if (block >= le32_to_cpu(ex->ee_block)
1789 + ext4_ext_get_actual_len(ex)) {
1790
1791 start = block;
1792 end = block + num;
1793 if (end >= next)
1794 end = next;
1795 } else if (block >= le32_to_cpu(ex->ee_block)) {
1796
1797
1798
1799
1800 start = block;
1801 end = le32_to_cpu(ex->ee_block)
1802 + ext4_ext_get_actual_len(ex);
1803 if (block + num < end)
1804 end = block + num;
1805 exists = 1;
1806 } else {
1807 BUG();
1808 }
1809 BUG_ON(end <= start);
1810
1811 if (!exists) {
1812 cbex.ec_block = start;
1813 cbex.ec_len = end - start;
1814 cbex.ec_start = 0;
1815 cbex.ec_type = EXT4_EXT_CACHE_GAP;
1816 } else {
1817 cbex.ec_block = le32_to_cpu(ex->ee_block);
1818 cbex.ec_len = ext4_ext_get_actual_len(ex);
1819 cbex.ec_start = ext_pblock(ex);
1820 cbex.ec_type = EXT4_EXT_CACHE_EXTENT;
1821 }
1822
1823 BUG_ON(cbex.ec_len == 0);
1824 err = func(inode, path, &cbex, ex, cbdata);
1825 ext4_ext_drop_refs(path);
1826
1827 if (err < 0)
1828 break;
1829
1830 if (err == EXT_REPEAT)
1831 continue;
1832 else if (err == EXT_BREAK) {
1833 err = 0;
1834 break;
1835 }
1836
1837 if (ext_depth(inode) != depth) {
1838
1839 kfree(path);
1840 path = NULL;
1841 }
1842
1843 block = cbex.ec_block + cbex.ec_len;
1844 }
1845
1846 if (path) {
1847 ext4_ext_drop_refs(path);
1848 kfree(path);
1849 }
1850
1851 return err;
1852}
1853
1854static void
1855ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
1856 __u32 len, ext4_fsblk_t start, int type)
1857{
1858 struct ext4_ext_cache *cex;
1859 BUG_ON(len == 0);
1860 spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
1861 cex = &EXT4_I(inode)->i_cached_extent;
1862 cex->ec_type = type;
1863 cex->ec_block = block;
1864 cex->ec_len = len;
1865 cex->ec_start = start;
1866 spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
1867}
1868
1869
1870
1871
1872
1873
1874static void
1875ext4_ext_put_gap_in_cache(struct inode *inode, struct ext4_ext_path *path,
1876 ext4_lblk_t block)
1877{
1878 int depth = ext_depth(inode);
1879 unsigned long len;
1880 ext4_lblk_t lblock;
1881 struct ext4_extent *ex;
1882
1883 ex = path[depth].p_ext;
1884 if (ex == NULL) {
1885
1886 lblock = 0;
1887 len = EXT_MAX_BLOCK;
1888 ext_debug("cache gap(whole file):");
1889 } else if (block < le32_to_cpu(ex->ee_block)) {
1890 lblock = block;
1891 len = le32_to_cpu(ex->ee_block) - block;
1892 ext_debug("cache gap(before): %u [%u:%u]",
1893 block,
1894 le32_to_cpu(ex->ee_block),
1895 ext4_ext_get_actual_len(ex));
1896 } else if (block >= le32_to_cpu(ex->ee_block)
1897 + ext4_ext_get_actual_len(ex)) {
1898 ext4_lblk_t next;
1899 lblock = le32_to_cpu(ex->ee_block)
1900 + ext4_ext_get_actual_len(ex);
1901
1902 next = ext4_ext_next_allocated_block(path);
1903 ext_debug("cache gap(after): [%u:%u] %u",
1904 le32_to_cpu(ex->ee_block),
1905 ext4_ext_get_actual_len(ex),
1906 block);
1907 BUG_ON(next == lblock);
1908 len = next - lblock;
1909 } else {
1910 lblock = len = 0;
1911 BUG();
1912 }
1913
1914 ext_debug(" -> %u:%lu\n", lblock, len);
1915 ext4_ext_put_in_cache(inode, lblock, len, 0, EXT4_EXT_CACHE_GAP);
1916}
1917
1918static int
1919ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block,
1920 struct ext4_extent *ex)
1921{
1922 struct ext4_ext_cache *cex;
1923 int ret = EXT4_EXT_CACHE_NO;
1924
1925
1926
1927
1928 spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
1929 cex = &EXT4_I(inode)->i_cached_extent;
1930
1931
1932 if (cex->ec_type == EXT4_EXT_CACHE_NO)
1933 goto errout;
1934
1935 BUG_ON(cex->ec_type != EXT4_EXT_CACHE_GAP &&
1936 cex->ec_type != EXT4_EXT_CACHE_EXTENT);
1937 if (block >= cex->ec_block && block < cex->ec_block + cex->ec_len) {
1938 ex->ee_block = cpu_to_le32(cex->ec_block);
1939 ext4_ext_store_pblock(ex, cex->ec_start);
1940 ex->ee_len = cpu_to_le16(cex->ec_len);
1941 ext_debug("%u cached by %u:%u:%llu\n",
1942 block,
1943 cex->ec_block, cex->ec_len, cex->ec_start);
1944 ret = cex->ec_type;
1945 }
1946errout:
1947 spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
1948 return ret;
1949}
1950
1951
1952
1953
1954
1955
1956
1957static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode,
1958 struct ext4_ext_path *path)
1959{
1960 struct buffer_head *bh;
1961 int err;
1962 ext4_fsblk_t leaf;
1963
1964
1965 path--;
1966 leaf = idx_pblock(path->p_idx);
1967 BUG_ON(path->p_hdr->eh_entries == 0);
1968 err = ext4_ext_get_access(handle, inode, path);
1969 if (err)
1970 return err;
1971 le16_add_cpu(&path->p_hdr->eh_entries, -1);
1972 err = ext4_ext_dirty(handle, inode, path);
1973 if (err)
1974 return err;
1975 ext_debug("index is empty, remove it, free block %llu\n", leaf);
1976 bh = sb_find_get_block(inode->i_sb, leaf);
1977 ext4_forget(handle, 1, inode, bh, leaf);
1978 ext4_free_blocks(handle, inode, leaf, 1, 1);
1979 return err;
1980}
1981
1982
1983
1984
1985
1986
1987
1988
1989int ext4_ext_calc_credits_for_single_extent(struct inode *inode, int nrblocks,
1990 struct ext4_ext_path *path)
1991{
1992 if (path) {
1993 int depth = ext_depth(inode);
1994 int ret = 0;
1995
1996
1997 if (le16_to_cpu(path[depth].p_hdr->eh_entries)
1998 < le16_to_cpu(path[depth].p_hdr->eh_max)) {
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009 ret = 2 + EXT4_META_TRANS_BLOCKS(inode->i_sb);
2010 return ret;
2011 }
2012 }
2013
2014 return ext4_chunk_trans_blocks(inode, nrblocks);
2015}
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, int chunk)
2029{
2030 int index;
2031 int depth = ext_depth(inode);
2032
2033 if (chunk)
2034 index = depth * 2;
2035 else
2036 index = depth * 3;
2037
2038 return index;
2039}
2040
2041static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
2042 struct ext4_extent *ex,
2043 ext4_lblk_t from, ext4_lblk_t to)
2044{
2045 struct buffer_head *bh;
2046 unsigned short ee_len = ext4_ext_get_actual_len(ex);
2047 int i, metadata = 0;
2048
2049 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
2050 metadata = 1;
2051#ifdef EXTENTS_STATS
2052 {
2053 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
2054 spin_lock(&sbi->s_ext_stats_lock);
2055 sbi->s_ext_blocks += ee_len;
2056 sbi->s_ext_extents++;
2057 if (ee_len < sbi->s_ext_min)
2058 sbi->s_ext_min = ee_len;
2059 if (ee_len > sbi->s_ext_max)
2060 sbi->s_ext_max = ee_len;
2061 if (ext_depth(inode) > sbi->s_depth_max)
2062 sbi->s_depth_max = ext_depth(inode);
2063 spin_unlock(&sbi->s_ext_stats_lock);
2064 }
2065#endif
2066 if (from >= le32_to_cpu(ex->ee_block)
2067 && to == le32_to_cpu(ex->ee_block) + ee_len - 1) {
2068
2069 ext4_lblk_t num;
2070 ext4_fsblk_t start;
2071
2072 num = le32_to_cpu(ex->ee_block) + ee_len - from;
2073 start = ext_pblock(ex) + ee_len - num;
2074 ext_debug("free last %u blocks starting %llu\n", num, start);
2075 for (i = 0; i < num; i++) {
2076 bh = sb_find_get_block(inode->i_sb, start + i);
2077 ext4_forget(handle, 0, inode, bh, start + i);
2078 }
2079 ext4_free_blocks(handle, inode, start, num, metadata);
2080 } else if (from == le32_to_cpu(ex->ee_block)
2081 && to <= le32_to_cpu(ex->ee_block) + ee_len - 1) {
2082 printk(KERN_INFO "strange request: removal %u-%u from %u:%u\n",
2083 from, to, le32_to_cpu(ex->ee_block), ee_len);
2084 } else {
2085 printk(KERN_INFO "strange request: removal(2) "
2086 "%u-%u from %u:%u\n",
2087 from, to, le32_to_cpu(ex->ee_block), ee_len);
2088 }
2089 return 0;
2090}
2091
2092static int
2093ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
2094 struct ext4_ext_path *path, ext4_lblk_t start)
2095{
2096 int err = 0, correct_index = 0;
2097 int depth = ext_depth(inode), credits;
2098 struct ext4_extent_header *eh;
2099 ext4_lblk_t a, b, block;
2100 unsigned num;
2101 ext4_lblk_t ex_ee_block;
2102 unsigned short ex_ee_len;
2103 unsigned uninitialized = 0;
2104 struct ext4_extent *ex;
2105
2106
2107 ext_debug("truncate since %u in leaf\n", start);
2108 if (!path[depth].p_hdr)
2109 path[depth].p_hdr = ext_block_hdr(path[depth].p_bh);
2110 eh = path[depth].p_hdr;
2111 BUG_ON(eh == NULL);
2112
2113
2114 ex = EXT_LAST_EXTENT(eh);
2115
2116 ex_ee_block = le32_to_cpu(ex->ee_block);
2117 ex_ee_len = ext4_ext_get_actual_len(ex);
2118
2119 while (ex >= EXT_FIRST_EXTENT(eh) &&
2120 ex_ee_block + ex_ee_len > start) {
2121
2122 if (ext4_ext_is_uninitialized(ex))
2123 uninitialized = 1;
2124 else
2125 uninitialized = 0;
2126
2127 ext_debug("remove ext %u:[%d]%d\n", ex_ee_block,
2128 uninitialized, ex_ee_len);
2129 path[depth].p_ext = ex;
2130
2131 a = ex_ee_block > start ? ex_ee_block : start;
2132 b = ex_ee_block + ex_ee_len - 1 < EXT_MAX_BLOCK ?
2133 ex_ee_block + ex_ee_len - 1 : EXT_MAX_BLOCK;
2134
2135 ext_debug(" border %u:%u\n", a, b);
2136
2137 if (a != ex_ee_block && b != ex_ee_block + ex_ee_len - 1) {
2138 block = 0;
2139 num = 0;
2140 BUG();
2141 } else if (a != ex_ee_block) {
2142
2143 block = ex_ee_block;
2144 num = a - block;
2145 } else if (b != ex_ee_block + ex_ee_len - 1) {
2146
2147 block = a;
2148 num = b - a;
2149
2150 BUG();
2151 } else {
2152
2153 block = ex_ee_block;
2154 num = 0;
2155 BUG_ON(a != ex_ee_block);
2156 BUG_ON(b != ex_ee_block + ex_ee_len - 1);
2157 }
2158
2159
2160
2161
2162
2163
2164
2165 credits = 7 + 2*(ex_ee_len/EXT4_BLOCKS_PER_GROUP(inode->i_sb));
2166 if (ex == EXT_FIRST_EXTENT(eh)) {
2167 correct_index = 1;
2168 credits += (ext_depth(inode)) + 1;
2169 }
2170 credits += 2 * EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
2171
2172 err = ext4_ext_truncate_extend_restart(handle, inode, credits);
2173 if (err)
2174 goto out;
2175
2176 err = ext4_ext_get_access(handle, inode, path + depth);
2177 if (err)
2178 goto out;
2179
2180 err = ext4_remove_blocks(handle, inode, ex, a, b);
2181 if (err)
2182 goto out;
2183
2184 if (num == 0) {
2185
2186 ext4_ext_store_pblock(ex, 0);
2187 le16_add_cpu(&eh->eh_entries, -1);
2188 }
2189
2190 ex->ee_block = cpu_to_le32(block);
2191 ex->ee_len = cpu_to_le16(num);
2192
2193
2194
2195
2196 if (uninitialized && num)
2197 ext4_ext_mark_uninitialized(ex);
2198
2199 err = ext4_ext_dirty(handle, inode, path + depth);
2200 if (err)
2201 goto out;
2202
2203 ext_debug("new extent: %u:%u:%llu\n", block, num,
2204 ext_pblock(ex));
2205 ex--;
2206 ex_ee_block = le32_to_cpu(ex->ee_block);
2207 ex_ee_len = ext4_ext_get_actual_len(ex);
2208 }
2209
2210 if (correct_index && eh->eh_entries)
2211 err = ext4_ext_correct_indexes(handle, inode, path);
2212
2213
2214
2215 if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL)
2216 err = ext4_ext_rm_idx(handle, inode, path + depth);
2217
2218out:
2219 return err;
2220}
2221
2222
2223
2224
2225
2226static int
2227ext4_ext_more_to_rm(struct ext4_ext_path *path)
2228{
2229 BUG_ON(path->p_idx == NULL);
2230
2231 if (path->p_idx < EXT_FIRST_INDEX(path->p_hdr))
2232 return 0;
2233
2234
2235
2236
2237
2238 if (le16_to_cpu(path->p_hdr->eh_entries) == path->p_block)
2239 return 0;
2240 return 1;
2241}
2242
2243static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start)
2244{
2245 struct super_block *sb = inode->i_sb;
2246 int depth = ext_depth(inode);
2247 struct ext4_ext_path *path;
2248 handle_t *handle;
2249 int i = 0, err = 0;
2250
2251 ext_debug("truncate since %u\n", start);
2252
2253
2254 handle = ext4_journal_start(inode, depth + 1);
2255 if (IS_ERR(handle))
2256 return PTR_ERR(handle);
2257
2258 ext4_ext_invalidate_cache(inode);
2259
2260
2261
2262
2263
2264 path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1), GFP_NOFS);
2265 if (path == NULL) {
2266 ext4_journal_stop(handle);
2267 return -ENOMEM;
2268 }
2269 path[0].p_hdr = ext_inode_hdr(inode);
2270 if (ext4_ext_check(inode, path[0].p_hdr, depth)) {
2271 err = -EIO;
2272 goto out;
2273 }
2274 path[0].p_depth = depth;
2275
2276 while (i >= 0 && err == 0) {
2277 if (i == depth) {
2278
2279 err = ext4_ext_rm_leaf(handle, inode, path, start);
2280
2281 brelse(path[i].p_bh);
2282 path[i].p_bh = NULL;
2283 i--;
2284 continue;
2285 }
2286
2287
2288 if (!path[i].p_hdr) {
2289 ext_debug("initialize header\n");
2290 path[i].p_hdr = ext_block_hdr(path[i].p_bh);
2291 }
2292
2293 if (!path[i].p_idx) {
2294
2295 path[i].p_idx = EXT_LAST_INDEX(path[i].p_hdr);
2296 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries)+1;
2297 ext_debug("init index ptr: hdr 0x%p, num %d\n",
2298 path[i].p_hdr,
2299 le16_to_cpu(path[i].p_hdr->eh_entries));
2300 } else {
2301
2302 path[i].p_idx--;
2303 }
2304
2305 ext_debug("level %d - index, first 0x%p, cur 0x%p\n",
2306 i, EXT_FIRST_INDEX(path[i].p_hdr),
2307 path[i].p_idx);
2308 if (ext4_ext_more_to_rm(path + i)) {
2309 struct buffer_head *bh;
2310
2311 ext_debug("move to level %d (block %llu)\n",
2312 i + 1, idx_pblock(path[i].p_idx));
2313 memset(path + i + 1, 0, sizeof(*path));
2314 bh = sb_bread(sb, idx_pblock(path[i].p_idx));
2315 if (!bh) {
2316
2317 err = -EIO;
2318 break;
2319 }
2320 if (WARN_ON(i + 1 > depth)) {
2321 err = -EIO;
2322 break;
2323 }
2324 if (ext4_ext_check(inode, ext_block_hdr(bh),
2325 depth - i - 1)) {
2326 err = -EIO;
2327 break;
2328 }
2329 path[i + 1].p_bh = bh;
2330
2331
2332
2333 path[i].p_block = le16_to_cpu(path[i].p_hdr->eh_entries);
2334 i++;
2335 } else {
2336
2337 if (path[i].p_hdr->eh_entries == 0 && i > 0) {
2338
2339
2340
2341 err = ext4_ext_rm_idx(handle, inode, path + i);
2342 }
2343
2344 brelse(path[i].p_bh);
2345 path[i].p_bh = NULL;
2346 i--;
2347 ext_debug("return to level %d\n", i);
2348 }
2349 }
2350
2351
2352 if (path->p_hdr->eh_entries == 0) {
2353
2354
2355
2356
2357 err = ext4_ext_get_access(handle, inode, path);
2358 if (err == 0) {
2359 ext_inode_hdr(inode)->eh_depth = 0;
2360 ext_inode_hdr(inode)->eh_max =
2361 cpu_to_le16(ext4_ext_space_root(inode, 0));
2362 err = ext4_ext_dirty(handle, inode, path);
2363 }
2364 }
2365out:
2366 ext4_ext_drop_refs(path);
2367 kfree(path);
2368 ext4_journal_stop(handle);
2369
2370 return err;
2371}
2372
2373
2374
2375
2376void ext4_ext_init(struct super_block *sb)
2377{
2378
2379
2380
2381
2382 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2383#if defined(AGGRESSIVE_TEST) || defined(CHECK_BINSEARCH) || defined(EXTENTS_STATS)
2384 printk(KERN_INFO "EXT4-fs: file extents enabled");
2385#ifdef AGGRESSIVE_TEST
2386 printk(", aggressive tests");
2387#endif
2388#ifdef CHECK_BINSEARCH
2389 printk(", check binsearch");
2390#endif
2391#ifdef EXTENTS_STATS
2392 printk(", stats");
2393#endif
2394 printk("\n");
2395#endif
2396#ifdef EXTENTS_STATS
2397 spin_lock_init(&EXT4_SB(sb)->s_ext_stats_lock);
2398 EXT4_SB(sb)->s_ext_min = 1 << 30;
2399 EXT4_SB(sb)->s_ext_max = 0;
2400#endif
2401 }
2402}
2403
2404
2405
2406
2407void ext4_ext_release(struct super_block *sb)
2408{
2409 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2410 return;
2411
2412#ifdef EXTENTS_STATS
2413 if (EXT4_SB(sb)->s_ext_blocks && EXT4_SB(sb)->s_ext_extents) {
2414 struct ext4_sb_info *sbi = EXT4_SB(sb);
2415 printk(KERN_ERR "EXT4-fs: %lu blocks in %lu extents (%lu ave)\n",
2416 sbi->s_ext_blocks, sbi->s_ext_extents,
2417 sbi->s_ext_blocks / sbi->s_ext_extents);
2418 printk(KERN_ERR "EXT4-fs: extents: %lu min, %lu max, max depth %lu\n",
2419 sbi->s_ext_min, sbi->s_ext_max, sbi->s_depth_max);
2420 }
2421#endif
2422}
2423
2424static void bi_complete(struct bio *bio, int error)
2425{
2426 complete((struct completion *)bio->bi_private);
2427}
2428
2429
2430static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
2431{
2432 int ret = -EIO;
2433 struct bio *bio;
2434 int blkbits, blocksize;
2435 sector_t ee_pblock;
2436 struct completion event;
2437 unsigned int ee_len, len, done, offset;
2438
2439
2440 blkbits = inode->i_blkbits;
2441 blocksize = inode->i_sb->s_blocksize;
2442 ee_len = ext4_ext_get_actual_len(ex);
2443 ee_pblock = ext_pblock(ex);
2444
2445
2446 ee_pblock = ee_pblock << (blkbits - 9);
2447
2448 while (ee_len > 0) {
2449
2450 if (ee_len > BIO_MAX_PAGES)
2451 len = BIO_MAX_PAGES;
2452 else
2453 len = ee_len;
2454
2455 bio = bio_alloc(GFP_NOIO, len);
2456 bio->bi_sector = ee_pblock;
2457 bio->bi_bdev = inode->i_sb->s_bdev;
2458
2459 done = 0;
2460 offset = 0;
2461 while (done < len) {
2462 ret = bio_add_page(bio, ZERO_PAGE(0),
2463 blocksize, offset);
2464 if (ret != blocksize) {
2465
2466
2467
2468
2469 break;
2470 }
2471 done++;
2472 offset += blocksize;
2473 if (offset >= PAGE_CACHE_SIZE)
2474 offset = 0;
2475 }
2476
2477 init_completion(&event);
2478 bio->bi_private = &event;
2479 bio->bi_end_io = bi_complete;
2480 submit_bio(WRITE, bio);
2481 wait_for_completion(&event);
2482
2483 if (test_bit(BIO_UPTODATE, &bio->bi_flags))
2484 ret = 0;
2485 else {
2486 ret = -EIO;
2487 break;
2488 }
2489 bio_put(bio);
2490 ee_len -= done;
2491 ee_pblock += done << (blkbits - 9);
2492 }
2493 return ret;
2494}
2495
2496#define EXT4_EXT_ZERO_LEN 7
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507static int ext4_ext_convert_to_initialized(handle_t *handle,
2508 struct inode *inode,
2509 struct ext4_ext_path *path,
2510 ext4_lblk_t iblock,
2511 unsigned int max_blocks)
2512{
2513 struct ext4_extent *ex, newex, orig_ex;
2514 struct ext4_extent *ex1 = NULL;
2515 struct ext4_extent *ex2 = NULL;
2516 struct ext4_extent *ex3 = NULL;
2517 struct ext4_extent_header *eh;
2518 ext4_lblk_t ee_block;
2519 unsigned int allocated, ee_len, depth;
2520 ext4_fsblk_t newblock;
2521 int err = 0;
2522 int ret = 0;
2523
2524 depth = ext_depth(inode);
2525 eh = path[depth].p_hdr;
2526 ex = path[depth].p_ext;
2527 ee_block = le32_to_cpu(ex->ee_block);
2528 ee_len = ext4_ext_get_actual_len(ex);
2529 allocated = ee_len - (iblock - ee_block);
2530 newblock = iblock - ee_block + ext_pblock(ex);
2531 ex2 = ex;
2532 orig_ex.ee_block = ex->ee_block;
2533 orig_ex.ee_len = cpu_to_le16(ee_len);
2534 ext4_ext_store_pblock(&orig_ex, ext_pblock(ex));
2535
2536 err = ext4_ext_get_access(handle, inode, path + depth);
2537 if (err)
2538 goto out;
2539
2540 if (ee_len <= 2*EXT4_EXT_ZERO_LEN) {
2541 err = ext4_ext_zeroout(inode, &orig_ex);
2542 if (err)
2543 goto fix_extent_len;
2544
2545 ex->ee_block = orig_ex.ee_block;
2546 ex->ee_len = orig_ex.ee_len;
2547 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2548 ext4_ext_dirty(handle, inode, path + depth);
2549
2550 return allocated;
2551 }
2552
2553
2554 if (iblock > ee_block) {
2555 ex1 = ex;
2556 ex1->ee_len = cpu_to_le16(iblock - ee_block);
2557 ext4_ext_mark_uninitialized(ex1);
2558 ex2 = &newex;
2559 }
2560
2561
2562
2563
2564
2565 if (!ex1 && allocated > max_blocks)
2566 ex2->ee_len = cpu_to_le16(max_blocks);
2567
2568 if (allocated > max_blocks) {
2569 unsigned int newdepth;
2570
2571 if (allocated <= EXT4_EXT_ZERO_LEN) {
2572
2573
2574
2575
2576
2577
2578
2579 ex->ee_block = orig_ex.ee_block;
2580 ex->ee_len = cpu_to_le16(ee_len - allocated);
2581 ext4_ext_mark_uninitialized(ex);
2582 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2583 ext4_ext_dirty(handle, inode, path + depth);
2584
2585 ex3 = &newex;
2586 ex3->ee_block = cpu_to_le32(iblock);
2587 ext4_ext_store_pblock(ex3, newblock);
2588 ex3->ee_len = cpu_to_le16(allocated);
2589 err = ext4_ext_insert_extent(handle, inode, path,
2590 ex3, 0);
2591 if (err == -ENOSPC) {
2592 err = ext4_ext_zeroout(inode, &orig_ex);
2593 if (err)
2594 goto fix_extent_len;
2595 ex->ee_block = orig_ex.ee_block;
2596 ex->ee_len = orig_ex.ee_len;
2597 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2598 ext4_ext_dirty(handle, inode, path + depth);
2599
2600 return allocated;
2601
2602 } else if (err)
2603 goto fix_extent_len;
2604
2605
2606
2607
2608
2609
2610
2611
2612 err = ext4_ext_zeroout(inode, ex3);
2613 if (err) {
2614
2615
2616
2617
2618
2619 depth = ext_depth(inode);
2620 ext4_ext_drop_refs(path);
2621 path = ext4_ext_find_extent(inode,
2622 iblock, path);
2623 if (IS_ERR(path)) {
2624 err = PTR_ERR(path);
2625 return err;
2626 }
2627
2628 ex = path[depth].p_ext;
2629 err = ext4_ext_get_access(handle, inode,
2630 path + depth);
2631 if (err)
2632 return err;
2633 ext4_ext_mark_uninitialized(ex);
2634 ext4_ext_dirty(handle, inode, path + depth);
2635 return err;
2636 }
2637
2638
2639 return allocated;
2640 }
2641 ex3 = &newex;
2642 ex3->ee_block = cpu_to_le32(iblock + max_blocks);
2643 ext4_ext_store_pblock(ex3, newblock + max_blocks);
2644 ex3->ee_len = cpu_to_le16(allocated - max_blocks);
2645 ext4_ext_mark_uninitialized(ex3);
2646 err = ext4_ext_insert_extent(handle, inode, path, ex3, 0);
2647 if (err == -ENOSPC) {
2648 err = ext4_ext_zeroout(inode, &orig_ex);
2649 if (err)
2650 goto fix_extent_len;
2651
2652 ex->ee_block = orig_ex.ee_block;
2653 ex->ee_len = orig_ex.ee_len;
2654 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2655 ext4_ext_dirty(handle, inode, path + depth);
2656
2657
2658 return allocated;
2659
2660 } else if (err)
2661 goto fix_extent_len;
2662
2663
2664
2665
2666 newdepth = ext_depth(inode);
2667
2668
2669
2670
2671 orig_ex.ee_len = cpu_to_le16(ee_len -
2672 ext4_ext_get_actual_len(ex3));
2673 depth = newdepth;
2674 ext4_ext_drop_refs(path);
2675 path = ext4_ext_find_extent(inode, iblock, path);
2676 if (IS_ERR(path)) {
2677 err = PTR_ERR(path);
2678 goto out;
2679 }
2680 eh = path[depth].p_hdr;
2681 ex = path[depth].p_ext;
2682 if (ex2 != &newex)
2683 ex2 = ex;
2684
2685 err = ext4_ext_get_access(handle, inode, path + depth);
2686 if (err)
2687 goto out;
2688
2689 allocated = max_blocks;
2690
2691
2692
2693
2694
2695 if (le16_to_cpu(orig_ex.ee_len) <= EXT4_EXT_ZERO_LEN &&
2696 iblock != ee_block) {
2697 err = ext4_ext_zeroout(inode, &orig_ex);
2698 if (err)
2699 goto fix_extent_len;
2700
2701 ex->ee_block = orig_ex.ee_block;
2702 ex->ee_len = orig_ex.ee_len;
2703 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2704 ext4_ext_dirty(handle, inode, path + depth);
2705
2706
2707 return allocated;
2708 }
2709 }
2710
2711
2712
2713
2714
2715 if (ex1 && ex1 != ex) {
2716 ex1 = ex;
2717 ex1->ee_len = cpu_to_le16(iblock - ee_block);
2718 ext4_ext_mark_uninitialized(ex1);
2719 ex2 = &newex;
2720 }
2721
2722 ex2->ee_block = cpu_to_le32(iblock);
2723 ext4_ext_store_pblock(ex2, newblock);
2724 ex2->ee_len = cpu_to_le16(allocated);
2725 if (ex2 != ex)
2726 goto insert;
2727
2728
2729
2730
2731
2732
2733 if (ex2 > EXT_FIRST_EXTENT(eh)) {
2734
2735
2736
2737
2738 ret = ext4_ext_try_to_merge(inode, path, ex2 - 1);
2739 if (ret) {
2740 err = ext4_ext_correct_indexes(handle, inode, path);
2741 if (err)
2742 goto out;
2743 depth = ext_depth(inode);
2744 ex2--;
2745 }
2746 }
2747
2748
2749
2750
2751
2752 if (!ex3) {
2753 ret = ext4_ext_try_to_merge(inode, path, ex2);
2754 if (ret) {
2755 err = ext4_ext_correct_indexes(handle, inode, path);
2756 if (err)
2757 goto out;
2758 }
2759 }
2760
2761 err = ext4_ext_dirty(handle, inode, path + depth);
2762 goto out;
2763insert:
2764 err = ext4_ext_insert_extent(handle, inode, path, &newex, 0);
2765 if (err == -ENOSPC) {
2766 err = ext4_ext_zeroout(inode, &orig_ex);
2767 if (err)
2768 goto fix_extent_len;
2769
2770 ex->ee_block = orig_ex.ee_block;
2771 ex->ee_len = orig_ex.ee_len;
2772 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2773 ext4_ext_dirty(handle, inode, path + depth);
2774
2775 return allocated;
2776 } else if (err)
2777 goto fix_extent_len;
2778out:
2779 ext4_ext_show_leaf(inode, path);
2780 return err ? err : allocated;
2781
2782fix_extent_len:
2783 ex->ee_block = orig_ex.ee_block;
2784 ex->ee_len = orig_ex.ee_len;
2785 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2786 ext4_ext_mark_uninitialized(ex);
2787 ext4_ext_dirty(handle, inode, path + depth);
2788 return err;
2789}
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813static int ext4_split_unwritten_extents(handle_t *handle,
2814 struct inode *inode,
2815 struct ext4_ext_path *path,
2816 ext4_lblk_t iblock,
2817 unsigned int max_blocks,
2818 int flags)
2819{
2820 struct ext4_extent *ex, newex, orig_ex;
2821 struct ext4_extent *ex1 = NULL;
2822 struct ext4_extent *ex2 = NULL;
2823 struct ext4_extent *ex3 = NULL;
2824 struct ext4_extent_header *eh;
2825 ext4_lblk_t ee_block;
2826 unsigned int allocated, ee_len, depth;
2827 ext4_fsblk_t newblock;
2828 int err = 0;
2829
2830 ext_debug("ext4_split_unwritten_extents: inode %lu,"
2831 "iblock %llu, max_blocks %u\n", inode->i_ino,
2832 (unsigned long long)iblock, max_blocks);
2833 depth = ext_depth(inode);
2834 eh = path[depth].p_hdr;
2835 ex = path[depth].p_ext;
2836 ee_block = le32_to_cpu(ex->ee_block);
2837 ee_len = ext4_ext_get_actual_len(ex);
2838 allocated = ee_len - (iblock - ee_block);
2839 newblock = iblock - ee_block + ext_pblock(ex);
2840 ex2 = ex;
2841 orig_ex.ee_block = ex->ee_block;
2842 orig_ex.ee_len = cpu_to_le16(ee_len);
2843 ext4_ext_store_pblock(&orig_ex, ext_pblock(ex));
2844
2845
2846
2847
2848
2849
2850 if ((iblock == ee_block) && (allocated <= max_blocks))
2851 return allocated;
2852
2853 err = ext4_ext_get_access(handle, inode, path + depth);
2854 if (err)
2855 goto out;
2856
2857 if (iblock > ee_block) {
2858 ex1 = ex;
2859 ex1->ee_len = cpu_to_le16(iblock - ee_block);
2860 ext4_ext_mark_uninitialized(ex1);
2861 ex2 = &newex;
2862 }
2863
2864
2865
2866
2867
2868 if (!ex1 && allocated > max_blocks)
2869 ex2->ee_len = cpu_to_le16(max_blocks);
2870
2871 if (allocated > max_blocks) {
2872 unsigned int newdepth;
2873 ex3 = &newex;
2874 ex3->ee_block = cpu_to_le32(iblock + max_blocks);
2875 ext4_ext_store_pblock(ex3, newblock + max_blocks);
2876 ex3->ee_len = cpu_to_le16(allocated - max_blocks);
2877 ext4_ext_mark_uninitialized(ex3);
2878 err = ext4_ext_insert_extent(handle, inode, path, ex3, flags);
2879 if (err == -ENOSPC) {
2880 err = ext4_ext_zeroout(inode, &orig_ex);
2881 if (err)
2882 goto fix_extent_len;
2883
2884 ex->ee_block = orig_ex.ee_block;
2885 ex->ee_len = orig_ex.ee_len;
2886 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2887 ext4_ext_dirty(handle, inode, path + depth);
2888
2889
2890 return allocated;
2891
2892 } else if (err)
2893 goto fix_extent_len;
2894
2895
2896
2897
2898 newdepth = ext_depth(inode);
2899
2900
2901
2902
2903 orig_ex.ee_len = cpu_to_le16(ee_len -
2904 ext4_ext_get_actual_len(ex3));
2905 depth = newdepth;
2906 ext4_ext_drop_refs(path);
2907 path = ext4_ext_find_extent(inode, iblock, path);
2908 if (IS_ERR(path)) {
2909 err = PTR_ERR(path);
2910 goto out;
2911 }
2912 eh = path[depth].p_hdr;
2913 ex = path[depth].p_ext;
2914 if (ex2 != &newex)
2915 ex2 = ex;
2916
2917 err = ext4_ext_get_access(handle, inode, path + depth);
2918 if (err)
2919 goto out;
2920
2921 allocated = max_blocks;
2922 }
2923
2924
2925
2926
2927
2928 if (ex1 && ex1 != ex) {
2929 ex1 = ex;
2930 ex1->ee_len = cpu_to_le16(iblock - ee_block);
2931 ext4_ext_mark_uninitialized(ex1);
2932 ex2 = &newex;
2933 }
2934
2935
2936
2937
2938 ex2->ee_block = cpu_to_le32(iblock);
2939 ext4_ext_store_pblock(ex2, newblock);
2940 ex2->ee_len = cpu_to_le16(allocated);
2941 ext4_ext_mark_uninitialized(ex2);
2942 if (ex2 != ex)
2943 goto insert;
2944
2945 err = ext4_ext_dirty(handle, inode, path + depth);
2946 ext_debug("out here\n");
2947 goto out;
2948insert:
2949 err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
2950 if (err == -ENOSPC) {
2951 err = ext4_ext_zeroout(inode, &orig_ex);
2952 if (err)
2953 goto fix_extent_len;
2954
2955 ex->ee_block = orig_ex.ee_block;
2956 ex->ee_len = orig_ex.ee_len;
2957 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2958 ext4_ext_dirty(handle, inode, path + depth);
2959
2960 return allocated;
2961 } else if (err)
2962 goto fix_extent_len;
2963out:
2964 ext4_ext_show_leaf(inode, path);
2965 return err ? err : allocated;
2966
2967fix_extent_len:
2968 ex->ee_block = orig_ex.ee_block;
2969 ex->ee_len = orig_ex.ee_len;
2970 ext4_ext_store_pblock(ex, ext_pblock(&orig_ex));
2971 ext4_ext_mark_uninitialized(ex);
2972 ext4_ext_dirty(handle, inode, path + depth);
2973 return err;
2974}
2975static int ext4_convert_unwritten_extents_dio(handle_t *handle,
2976 struct inode *inode,
2977 struct ext4_ext_path *path)
2978{
2979 struct ext4_extent *ex;
2980 struct ext4_extent_header *eh;
2981 int depth;
2982 int err = 0;
2983 int ret = 0;
2984
2985 depth = ext_depth(inode);
2986 eh = path[depth].p_hdr;
2987 ex = path[depth].p_ext;
2988
2989 err = ext4_ext_get_access(handle, inode, path + depth);
2990 if (err)
2991 goto out;
2992
2993 ext4_ext_mark_initialized(ex);
2994
2995
2996
2997
2998
2999 if (ex > EXT_FIRST_EXTENT(eh)) {
3000
3001
3002
3003
3004 ret = ext4_ext_try_to_merge(inode, path, ex - 1);
3005 if (ret) {
3006 err = ext4_ext_correct_indexes(handle, inode, path);
3007 if (err)
3008 goto out;
3009 depth = ext_depth(inode);
3010 ex--;
3011 }
3012 }
3013
3014
3015
3016 ret = ext4_ext_try_to_merge(inode, path, ex);
3017 if (ret) {
3018 err = ext4_ext_correct_indexes(handle, inode, path);
3019 if (err)
3020 goto out;
3021 depth = ext_depth(inode);
3022 }
3023
3024 err = ext4_ext_dirty(handle, inode, path + depth);
3025out:
3026 ext4_ext_show_leaf(inode, path);
3027 return err;
3028}
3029
3030static int
3031ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
3032 ext4_lblk_t iblock, unsigned int max_blocks,
3033 struct ext4_ext_path *path, int flags,
3034 unsigned int allocated, struct buffer_head *bh_result,
3035 ext4_fsblk_t newblock)
3036{
3037 int ret = 0;
3038 int err = 0;
3039 ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
3040
3041 ext_debug("ext4_ext_handle_uninitialized_extents: inode %lu, logical"
3042 "block %llu, max_blocks %u, flags %d, allocated %u",
3043 inode->i_ino, (unsigned long long)iblock, max_blocks,
3044 flags, allocated);
3045 ext4_ext_show_leaf(inode, path);
3046
3047
3048 if (flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT) {
3049 ret = ext4_split_unwritten_extents(handle,
3050 inode, path, iblock,
3051 max_blocks, flags);
3052
3053
3054
3055
3056
3057 if (io)
3058 io->flag = DIO_AIO_UNWRITTEN;
3059 else
3060 EXT4_I(inode)->i_state |= EXT4_STATE_DIO_UNWRITTEN;
3061 goto out;
3062 }
3063
3064 if (flags == EXT4_GET_BLOCKS_DIO_CONVERT_EXT) {
3065 ret = ext4_convert_unwritten_extents_dio(handle, inode,
3066 path);
3067 goto out2;
3068 }
3069
3070
3071
3072
3073
3074 if (flags & EXT4_GET_BLOCKS_UNINIT_EXT)
3075 goto map_out;
3076
3077
3078 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
3079
3080
3081
3082
3083
3084
3085
3086 set_buffer_unwritten(bh_result);
3087 goto out1;
3088 }
3089
3090
3091 ret = ext4_ext_convert_to_initialized(handle, inode,
3092 path, iblock,
3093 max_blocks);
3094out:
3095 if (ret <= 0) {
3096 err = ret;
3097 goto out2;
3098 } else
3099 allocated = ret;
3100 set_buffer_new(bh_result);
3101map_out:
3102 set_buffer_mapped(bh_result);
3103out1:
3104 if (allocated > max_blocks)
3105 allocated = max_blocks;
3106 ext4_ext_show_leaf(inode, path);
3107 bh_result->b_bdev = inode->i_sb->s_bdev;
3108 bh_result->b_blocknr = newblock;
3109out2:
3110 if (path) {
3111 ext4_ext_drop_refs(path);
3112 kfree(path);
3113 }
3114 return err ? err : allocated;
3115}
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
3135 ext4_lblk_t iblock,
3136 unsigned int max_blocks, struct buffer_head *bh_result,
3137 int flags)
3138{
3139 struct ext4_ext_path *path = NULL;
3140 struct ext4_extent_header *eh;
3141 struct ext4_extent newex, *ex;
3142 ext4_fsblk_t newblock;
3143 int err = 0, depth, ret, cache_type;
3144 unsigned int allocated = 0;
3145 struct ext4_allocation_request ar;
3146 ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio;
3147
3148 __clear_bit(BH_New, &bh_result->b_state);
3149 ext_debug("blocks %u/%u requested for inode %lu\n",
3150 iblock, max_blocks, inode->i_ino);
3151
3152
3153 cache_type = ext4_ext_in_cache(inode, iblock, &newex);
3154 if (cache_type) {
3155 if (cache_type == EXT4_EXT_CACHE_GAP) {
3156 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
3157
3158
3159
3160
3161 goto out2;
3162 }
3163
3164 } else if (cache_type == EXT4_EXT_CACHE_EXTENT) {
3165
3166 newblock = iblock
3167 - le32_to_cpu(newex.ee_block)
3168 + ext_pblock(&newex);
3169
3170 allocated = ext4_ext_get_actual_len(&newex) -
3171 (iblock - le32_to_cpu(newex.ee_block));
3172 goto out;
3173 } else {
3174 BUG();
3175 }
3176 }
3177
3178
3179 path = ext4_ext_find_extent(inode, iblock, NULL);
3180 if (IS_ERR(path)) {
3181 err = PTR_ERR(path);
3182 path = NULL;
3183 goto out2;
3184 }
3185
3186 depth = ext_depth(inode);
3187
3188
3189
3190
3191
3192
3193 BUG_ON(path[depth].p_ext == NULL && depth != 0);
3194 eh = path[depth].p_hdr;
3195
3196 ex = path[depth].p_ext;
3197 if (ex) {
3198 ext4_lblk_t ee_block = le32_to_cpu(ex->ee_block);
3199 ext4_fsblk_t ee_start = ext_pblock(ex);
3200 unsigned short ee_len;
3201
3202
3203
3204
3205
3206 ee_len = ext4_ext_get_actual_len(ex);
3207
3208 if (iblock >= ee_block && iblock < ee_block + ee_len) {
3209 newblock = iblock - ee_block + ee_start;
3210
3211 allocated = ee_len - (iblock - ee_block);
3212 ext_debug("%u fit into %u:%d -> %llu\n", iblock,
3213 ee_block, ee_len, newblock);
3214
3215
3216 if (!ext4_ext_is_uninitialized(ex)) {
3217 ext4_ext_put_in_cache(inode, ee_block,
3218 ee_len, ee_start,
3219 EXT4_EXT_CACHE_EXTENT);
3220 goto out;
3221 }
3222 ret = ext4_ext_handle_uninitialized_extents(handle,
3223 inode, iblock, max_blocks, path,
3224 flags, allocated, bh_result, newblock);
3225 return ret;
3226 }
3227 }
3228
3229
3230
3231
3232
3233 if ((flags & EXT4_GET_BLOCKS_CREATE) == 0) {
3234
3235
3236
3237
3238 ext4_ext_put_gap_in_cache(inode, path, iblock);
3239 goto out2;
3240 }
3241
3242
3243
3244
3245
3246 ar.lleft = iblock;
3247 err = ext4_ext_search_left(inode, path, &ar.lleft, &ar.pleft);
3248 if (err)
3249 goto out2;
3250 ar.lright = iblock;
3251 err = ext4_ext_search_right(inode, path, &ar.lright, &ar.pright);
3252 if (err)
3253 goto out2;
3254
3255
3256
3257
3258
3259
3260
3261 if (max_blocks > EXT_INIT_MAX_LEN &&
3262 !(flags & EXT4_GET_BLOCKS_UNINIT_EXT))
3263 max_blocks = EXT_INIT_MAX_LEN;
3264 else if (max_blocks > EXT_UNINIT_MAX_LEN &&
3265 (flags & EXT4_GET_BLOCKS_UNINIT_EXT))
3266 max_blocks = EXT_UNINIT_MAX_LEN;
3267
3268
3269 newex.ee_block = cpu_to_le32(iblock);
3270 newex.ee_len = cpu_to_le16(max_blocks);
3271 err = ext4_ext_check_overlap(inode, &newex, path);
3272 if (err)
3273 allocated = ext4_ext_get_actual_len(&newex);
3274 else
3275 allocated = max_blocks;
3276
3277
3278 ar.inode = inode;
3279 ar.goal = ext4_ext_find_goal(inode, path, iblock);
3280 ar.logical = iblock;
3281 ar.len = allocated;
3282 if (S_ISREG(inode->i_mode))
3283 ar.flags = EXT4_MB_HINT_DATA;
3284 else
3285
3286 ar.flags = 0;
3287 newblock = ext4_mb_new_blocks(handle, &ar, &err);
3288 if (!newblock)
3289 goto out2;
3290 ext_debug("allocate new block: goal %llu, found %llu/%u\n",
3291 ar.goal, newblock, allocated);
3292
3293
3294 ext4_ext_store_pblock(&newex, newblock);
3295 newex.ee_len = cpu_to_le16(ar.len);
3296
3297 if (flags & EXT4_GET_BLOCKS_UNINIT_EXT){
3298 ext4_ext_mark_uninitialized(&newex);
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308 if (flags == EXT4_GET_BLOCKS_DIO_CREATE_EXT) {
3309 if (io)
3310 io->flag = DIO_AIO_UNWRITTEN;
3311 else
3312 EXT4_I(inode)->i_state |=
3313 EXT4_STATE_DIO_UNWRITTEN;;
3314 }
3315 }
3316 err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
3317 if (err) {
3318
3319
3320
3321 ext4_discard_preallocations(inode);
3322 ext4_free_blocks(handle, inode, ext_pblock(&newex),
3323 ext4_ext_get_actual_len(&newex), 0);
3324 goto out2;
3325 }
3326
3327
3328 newblock = ext_pblock(&newex);
3329 allocated = ext4_ext_get_actual_len(&newex);
3330 set_buffer_new(bh_result);
3331
3332
3333 if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0)
3334 ext4_ext_put_in_cache(inode, iblock, allocated, newblock,
3335 EXT4_EXT_CACHE_EXTENT);
3336out:
3337 if (allocated > max_blocks)
3338 allocated = max_blocks;
3339 ext4_ext_show_leaf(inode, path);
3340 set_buffer_mapped(bh_result);
3341 bh_result->b_bdev = inode->i_sb->s_bdev;
3342 bh_result->b_blocknr = newblock;
3343out2:
3344 if (path) {
3345 ext4_ext_drop_refs(path);
3346 kfree(path);
3347 }
3348 return err ? err : allocated;
3349}
3350
3351void ext4_ext_truncate(struct inode *inode)
3352{
3353 struct address_space *mapping = inode->i_mapping;
3354 struct super_block *sb = inode->i_sb;
3355 ext4_lblk_t last_block;
3356 handle_t *handle;
3357 int err = 0;
3358
3359
3360
3361
3362 err = ext4_writepage_trans_blocks(inode);
3363 handle = ext4_journal_start(inode, err);
3364 if (IS_ERR(handle))
3365 return;
3366
3367 if (inode->i_size & (sb->s_blocksize - 1))
3368 ext4_block_truncate_page(handle, mapping, inode->i_size);
3369
3370 if (ext4_orphan_add(handle, inode))
3371 goto out_stop;
3372
3373 down_write(&EXT4_I(inode)->i_data_sem);
3374 ext4_ext_invalidate_cache(inode);
3375
3376 ext4_discard_preallocations(inode);
3377
3378
3379
3380
3381
3382
3383
3384
3385 EXT4_I(inode)->i_disksize = inode->i_size;
3386 ext4_mark_inode_dirty(handle, inode);
3387
3388 last_block = (inode->i_size + sb->s_blocksize - 1)
3389 >> EXT4_BLOCK_SIZE_BITS(sb);
3390 err = ext4_ext_remove_space(inode, last_block);
3391
3392
3393
3394
3395 if (IS_SYNC(inode))
3396 ext4_handle_sync(handle);
3397
3398out_stop:
3399 up_write(&EXT4_I(inode)->i_data_sem);
3400
3401
3402
3403
3404
3405
3406
3407 if (inode->i_nlink)
3408 ext4_orphan_del(handle, inode);
3409
3410 inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
3411 ext4_mark_inode_dirty(handle, inode);
3412 ext4_journal_stop(handle);
3413}
3414
3415static void ext4_falloc_update_inode(struct inode *inode,
3416 int mode, loff_t new_size, int update_ctime)
3417{
3418 struct timespec now;
3419
3420 if (update_ctime) {
3421 now = current_fs_time(inode->i_sb);
3422 if (!timespec_equal(&inode->i_ctime, &now))
3423 inode->i_ctime = now;
3424 }
3425
3426
3427
3428
3429 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
3430 if (new_size > i_size_read(inode))
3431 i_size_write(inode, new_size);
3432 if (new_size > EXT4_I(inode)->i_disksize)
3433 ext4_update_i_disksize(inode, new_size);
3434 }
3435
3436}
3437
3438
3439
3440
3441
3442
3443
3444
3445long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
3446{
3447 handle_t *handle;
3448 ext4_lblk_t block;
3449 loff_t new_size;
3450 unsigned int max_blocks;
3451 int ret = 0;
3452 int ret2 = 0;
3453 int retries = 0;
3454 struct buffer_head map_bh;
3455 unsigned int credits, blkbits = inode->i_blkbits;
3456
3457
3458
3459
3460
3461 if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
3462 return -EOPNOTSUPP;
3463
3464
3465 if (S_ISDIR(inode->i_mode))
3466 return -ENODEV;
3467
3468 block = offset >> blkbits;
3469
3470
3471
3472
3473 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
3474 - block;
3475
3476
3477
3478 credits = ext4_chunk_trans_blocks(inode, max_blocks);
3479 mutex_lock(&inode->i_mutex);
3480retry:
3481 while (ret >= 0 && ret < max_blocks) {
3482 block = block + ret;
3483 max_blocks = max_blocks - ret;
3484 handle = ext4_journal_start(inode, credits);
3485 if (IS_ERR(handle)) {
3486 ret = PTR_ERR(handle);
3487 break;
3488 }
3489 map_bh.b_state = 0;
3490 ret = ext4_get_blocks(handle, inode, block,
3491 max_blocks, &map_bh,
3492 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT);
3493 if (ret <= 0) {
3494#ifdef EXT4FS_DEBUG
3495 WARN_ON(ret <= 0);
3496 printk(KERN_ERR "%s: ext4_ext_get_blocks "
3497 "returned error inode#%lu, block=%u, "
3498 "max_blocks=%u", __func__,
3499 inode->i_ino, block, max_blocks);
3500#endif
3501 ext4_mark_inode_dirty(handle, inode);
3502 ret2 = ext4_journal_stop(handle);
3503 break;
3504 }
3505 if ((block + ret) >= (EXT4_BLOCK_ALIGN(offset + len,
3506 blkbits) >> blkbits))
3507 new_size = offset + len;
3508 else
3509 new_size = (block + ret) << blkbits;
3510
3511 ext4_falloc_update_inode(inode, mode, new_size,
3512 buffer_new(&map_bh));
3513 ext4_mark_inode_dirty(handle, inode);
3514 ret2 = ext4_journal_stop(handle);
3515 if (ret2)
3516 break;
3517 }
3518 if (ret == -ENOSPC &&
3519 ext4_should_retry_alloc(inode->i_sb, &retries)) {
3520 ret = 0;
3521 goto retry;
3522 }
3523 mutex_unlock(&inode->i_mutex);
3524 return ret > 0 ? ret2 : ret;
3525}
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
3538 loff_t len)
3539{
3540 handle_t *handle;
3541 ext4_lblk_t block;
3542 unsigned int max_blocks;
3543 int ret = 0;
3544 int ret2 = 0;
3545 struct buffer_head map_bh;
3546 unsigned int credits, blkbits = inode->i_blkbits;
3547
3548 block = offset >> blkbits;
3549
3550
3551
3552
3553 max_blocks = (EXT4_BLOCK_ALIGN(len + offset, blkbits) >> blkbits)
3554 - block;
3555
3556
3557
3558 credits = ext4_chunk_trans_blocks(inode, max_blocks);
3559 while (ret >= 0 && ret < max_blocks) {
3560 block = block + ret;
3561 max_blocks = max_blocks - ret;
3562 handle = ext4_journal_start(inode, credits);
3563 if (IS_ERR(handle)) {
3564 ret = PTR_ERR(handle);
3565 break;
3566 }
3567 map_bh.b_state = 0;
3568 ret = ext4_get_blocks(handle, inode, block,
3569 max_blocks, &map_bh,
3570 EXT4_GET_BLOCKS_DIO_CONVERT_EXT);
3571 if (ret <= 0) {
3572 WARN_ON(ret <= 0);
3573 printk(KERN_ERR "%s: ext4_ext_get_blocks "
3574 "returned error inode#%lu, block=%u, "
3575 "max_blocks=%u", __func__,
3576 inode->i_ino, block, max_blocks);
3577 }
3578 ext4_mark_inode_dirty(handle, inode);
3579 ret2 = ext4_journal_stop(handle);
3580 if (ret <= 0 || ret2 )
3581 break;
3582 }
3583 return ret > 0 ? ret2 : ret;
3584}
3585
3586
3587
3588static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
3589 struct ext4_ext_cache *newex, struct ext4_extent *ex,
3590 void *data)
3591{
3592 struct fiemap_extent_info *fieinfo = data;
3593 unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
3594 __u64 logical;
3595 __u64 physical;
3596 __u64 length;
3597 __u32 flags = 0;
3598 int error;
3599
3600 logical = (__u64)newex->ec_block << blksize_bits;
3601
3602 if (newex->ec_type == EXT4_EXT_CACHE_GAP) {
3603 pgoff_t offset;
3604 struct page *page;
3605 struct buffer_head *bh = NULL;
3606
3607 offset = logical >> PAGE_SHIFT;
3608 page = find_get_page(inode->i_mapping, offset);
3609 if (!page || !page_has_buffers(page))
3610 return EXT_CONTINUE;
3611
3612 bh = page_buffers(page);
3613
3614 if (!bh)
3615 return EXT_CONTINUE;
3616
3617 if (buffer_delay(bh)) {
3618 flags |= FIEMAP_EXTENT_DELALLOC;
3619 page_cache_release(page);
3620 } else {
3621 page_cache_release(page);
3622 return EXT_CONTINUE;
3623 }
3624 }
3625
3626 physical = (__u64)newex->ec_start << blksize_bits;
3627 length = (__u64)newex->ec_len << blksize_bits;
3628
3629 if (ex && ext4_ext_is_uninitialized(ex))
3630 flags |= FIEMAP_EXTENT_UNWRITTEN;
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640 if (ext4_ext_next_allocated_block(path) == EXT_MAX_BLOCK ||
3641 newex->ec_block + newex->ec_len - 1 == EXT_MAX_BLOCK) {
3642 loff_t size = i_size_read(inode);
3643 loff_t bs = EXT4_BLOCK_SIZE(inode->i_sb);
3644
3645 flags |= FIEMAP_EXTENT_LAST;
3646 if ((flags & FIEMAP_EXTENT_DELALLOC) &&
3647 logical+length > size)
3648 length = (size - logical + bs - 1) & ~(bs-1);
3649 }
3650
3651 error = fiemap_fill_next_extent(fieinfo, logical, physical,
3652 length, flags);
3653 if (error < 0)
3654 return error;
3655 if (error == 1)
3656 return EXT_BREAK;
3657
3658 return EXT_CONTINUE;
3659}
3660
3661
3662#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
3663
3664static int ext4_xattr_fiemap(struct inode *inode,
3665 struct fiemap_extent_info *fieinfo)
3666{
3667 __u64 physical = 0;
3668 __u64 length;
3669 __u32 flags = FIEMAP_EXTENT_LAST;
3670 int blockbits = inode->i_sb->s_blocksize_bits;
3671 int error = 0;
3672
3673
3674 if (EXT4_I(inode)->i_state & EXT4_STATE_XATTR) {
3675 struct ext4_iloc iloc;
3676 int offset;
3677
3678 error = ext4_get_inode_loc(inode, &iloc);
3679 if (error)
3680 return error;
3681 physical = iloc.bh->b_blocknr << blockbits;
3682 offset = EXT4_GOOD_OLD_INODE_SIZE +
3683 EXT4_I(inode)->i_extra_isize;
3684 physical += offset;
3685 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
3686 flags |= FIEMAP_EXTENT_DATA_INLINE;
3687 } else {
3688 physical = EXT4_I(inode)->i_file_acl << blockbits;
3689 length = inode->i_sb->s_blocksize;
3690 }
3691
3692 if (physical)
3693 error = fiemap_fill_next_extent(fieinfo, 0, physical,
3694 length, flags);
3695 return (error < 0 ? error : 0);
3696}
3697
3698int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3699 __u64 start, __u64 len)
3700{
3701 ext4_lblk_t start_blk;
3702 ext4_lblk_t len_blks;
3703 int error = 0;
3704
3705
3706 if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
3707 return generic_block_fiemap(inode, fieinfo, start, len,
3708 ext4_get_block);
3709
3710 if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS))
3711 return -EBADR;
3712
3713 if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
3714 error = ext4_xattr_fiemap(inode, fieinfo);
3715 } else {
3716 start_blk = start >> inode->i_sb->s_blocksize_bits;
3717 len_blks = len >> inode->i_sb->s_blocksize_bits;
3718
3719
3720
3721
3722
3723 down_read(&EXT4_I(inode)->i_data_sem);
3724 error = ext4_ext_walk_space(inode, start_blk, len_blks,
3725 ext4_ext_fiemap_cb, fieinfo);
3726 up_read(&EXT4_I(inode)->i_data_sem);
3727 }
3728
3729 return error;
3730}
3731
3732