1
2
3
4
5
6#include <linux/fs.h>
7#include <linux/slab.h>
8#include <linux/highmem.h>
9#include <linux/pagemap.h>
10#include <asm/byteorder.h>
11#include <linux/swap.h>
12#include <linux/mpage.h>
13#include <linux/quotaops.h>
14#include <linux/blkdev.h>
15#include <linux/uio.h>
16#include <linux/mm.h>
17
18#include <cluster/masklog.h>
19
20#include "ocfs2.h"
21
22#include "alloc.h"
23#include "aops.h"
24#include "dlmglue.h"
25#include "extent_map.h"
26#include "file.h"
27#include "inode.h"
28#include "journal.h"
29#include "suballoc.h"
30#include "super.h"
31#include "symlink.h"
32#include "refcounttree.h"
33#include "ocfs2_trace.h"
34
35#include "buffer_head_io.h"
36#include "dir.h"
37#include "namei.h"
38#include "sysfile.h"
39
40static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
41 struct buffer_head *bh_result, int create)
42{
43 int err = -EIO;
44 int status;
45 struct ocfs2_dinode *fe = NULL;
46 struct buffer_head *bh = NULL;
47 struct buffer_head *buffer_cache_bh = NULL;
48 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
49 void *kaddr;
50
51 trace_ocfs2_symlink_get_block(
52 (unsigned long long)OCFS2_I(inode)->ip_blkno,
53 (unsigned long long)iblock, bh_result, create);
54
55 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
56
57 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
58 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
59 (unsigned long long)iblock);
60 goto bail;
61 }
62
63 status = ocfs2_read_inode_block(inode, &bh);
64 if (status < 0) {
65 mlog_errno(status);
66 goto bail;
67 }
68 fe = (struct ocfs2_dinode *) bh->b_data;
69
70 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
71 le32_to_cpu(fe->i_clusters))) {
72 err = -ENOMEM;
73 mlog(ML_ERROR, "block offset is outside the allocated size: "
74 "%llu\n", (unsigned long long)iblock);
75 goto bail;
76 }
77
78
79
80 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
81 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
82 iblock;
83 buffer_cache_bh = sb_getblk(osb->sb, blkno);
84 if (!buffer_cache_bh) {
85 err = -ENOMEM;
86 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
87 goto bail;
88 }
89
90
91
92
93
94 if (buffer_jbd(buffer_cache_bh)
95 && ocfs2_inode_is_new(inode)) {
96 kaddr = kmap_atomic(bh_result->b_page);
97 if (!kaddr) {
98 mlog(ML_ERROR, "couldn't kmap!\n");
99 goto bail;
100 }
101 memcpy(kaddr + (bh_result->b_size * iblock),
102 buffer_cache_bh->b_data,
103 bh_result->b_size);
104 kunmap_atomic(kaddr);
105 set_buffer_uptodate(bh_result);
106 }
107 brelse(buffer_cache_bh);
108 }
109
110 map_bh(bh_result, inode->i_sb,
111 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
112
113 err = 0;
114
115bail:
116 brelse(bh);
117
118 return err;
119}
120
121static int ocfs2_lock_get_block(struct inode *inode, sector_t iblock,
122 struct buffer_head *bh_result, int create)
123{
124 int ret = 0;
125 struct ocfs2_inode_info *oi = OCFS2_I(inode);
126
127 down_read(&oi->ip_alloc_sem);
128 ret = ocfs2_get_block(inode, iblock, bh_result, create);
129 up_read(&oi->ip_alloc_sem);
130
131 return ret;
132}
133
134int ocfs2_get_block(struct inode *inode, sector_t iblock,
135 struct buffer_head *bh_result, int create)
136{
137 int err = 0;
138 unsigned int ext_flags;
139 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
140 u64 p_blkno, count, past_eof;
141 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
142
143 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
144 (unsigned long long)iblock, bh_result, create);
145
146 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
147 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
148 inode, inode->i_ino);
149
150 if (S_ISLNK(inode->i_mode)) {
151
152 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
153 goto bail;
154 }
155
156 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
157 &ext_flags);
158 if (err) {
159 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
160 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
161 (unsigned long long)p_blkno);
162 goto bail;
163 }
164
165 if (max_blocks < count)
166 count = max_blocks;
167
168
169
170
171
172
173
174
175
176
177
178
179 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
180 clear_buffer_dirty(bh_result);
181 clear_buffer_uptodate(bh_result);
182 goto bail;
183 }
184
185
186 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
187 map_bh(bh_result, inode->i_sb, p_blkno);
188
189 bh_result->b_size = count << inode->i_blkbits;
190
191 if (!ocfs2_sparse_alloc(osb)) {
192 if (p_blkno == 0) {
193 err = -EIO;
194 mlog(ML_ERROR,
195 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
196 (unsigned long long)iblock,
197 (unsigned long long)p_blkno,
198 (unsigned long long)OCFS2_I(inode)->ip_blkno);
199 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
200 dump_stack();
201 goto bail;
202 }
203 }
204
205 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
206
207 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
208 (unsigned long long)past_eof);
209 if (create && (iblock >= past_eof))
210 set_buffer_new(bh_result);
211
212bail:
213 if (err < 0)
214 err = -EIO;
215
216 return err;
217}
218
219int ocfs2_read_inline_data(struct inode *inode, struct page *page,
220 struct buffer_head *di_bh)
221{
222 void *kaddr;
223 loff_t size;
224 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
225
226 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
227 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n",
228 (unsigned long long)OCFS2_I(inode)->ip_blkno);
229 return -EROFS;
230 }
231
232 size = i_size_read(inode);
233
234 if (size > PAGE_SIZE ||
235 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
236 ocfs2_error(inode->i_sb,
237 "Inode %llu has with inline data has bad size: %Lu\n",
238 (unsigned long long)OCFS2_I(inode)->ip_blkno,
239 (unsigned long long)size);
240 return -EROFS;
241 }
242
243 kaddr = kmap_atomic(page);
244 if (size)
245 memcpy(kaddr, di->id2.i_data.id_data, size);
246
247 memset(kaddr + size, 0, PAGE_SIZE - size);
248 flush_dcache_page(page);
249 kunmap_atomic(kaddr);
250
251 SetPageUptodate(page);
252
253 return 0;
254}
255
256static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
257{
258 int ret;
259 struct buffer_head *di_bh = NULL;
260
261 BUG_ON(!PageLocked(page));
262 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
263
264 ret = ocfs2_read_inode_block(inode, &di_bh);
265 if (ret) {
266 mlog_errno(ret);
267 goto out;
268 }
269
270 ret = ocfs2_read_inline_data(inode, page, di_bh);
271out:
272 unlock_page(page);
273
274 brelse(di_bh);
275 return ret;
276}
277
278static int ocfs2_readpage(struct file *file, struct page *page)
279{
280 struct inode *inode = page->mapping->host;
281 struct ocfs2_inode_info *oi = OCFS2_I(inode);
282 loff_t start = (loff_t)page->index << PAGE_SHIFT;
283 int ret, unlock = 1;
284
285 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
286 (page ? page->index : 0));
287
288 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
289 if (ret != 0) {
290 if (ret == AOP_TRUNCATED_PAGE)
291 unlock = 0;
292 mlog_errno(ret);
293 goto out;
294 }
295
296 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
297
298
299
300
301 ret = AOP_TRUNCATED_PAGE;
302 unlock_page(page);
303 unlock = 0;
304 down_read(&oi->ip_alloc_sem);
305 up_read(&oi->ip_alloc_sem);
306 goto out_inode_unlock;
307 }
308
309
310
311
312
313
314
315
316
317
318
319 if (start >= i_size_read(inode)) {
320 zero_user(page, 0, PAGE_SIZE);
321 SetPageUptodate(page);
322 ret = 0;
323 goto out_alloc;
324 }
325
326 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
327 ret = ocfs2_readpage_inline(inode, page);
328 else
329 ret = block_read_full_page(page, ocfs2_get_block);
330 unlock = 0;
331
332out_alloc:
333 up_read(&oi->ip_alloc_sem);
334out_inode_unlock:
335 ocfs2_inode_unlock(inode, 0);
336out:
337 if (unlock)
338 unlock_page(page);
339 return ret;
340}
341
342
343
344
345
346
347
348
349
350
351static void ocfs2_readahead(struct readahead_control *rac)
352{
353 int ret;
354 struct inode *inode = rac->mapping->host;
355 struct ocfs2_inode_info *oi = OCFS2_I(inode);
356
357
358
359
360
361 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
362 if (ret)
363 return;
364
365 if (down_read_trylock(&oi->ip_alloc_sem) == 0)
366 goto out_unlock;
367
368
369
370
371
372 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
373 goto out_up;
374
375
376
377
378
379 if (readahead_pos(rac) >= i_size_read(inode))
380 goto out_up;
381
382 mpage_readahead(rac, ocfs2_get_block);
383
384out_up:
385 up_read(&oi->ip_alloc_sem);
386out_unlock:
387 ocfs2_inode_unlock(inode, 0);
388}
389
390
391
392
393
394
395
396
397
398
399
400
401static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
402{
403 trace_ocfs2_writepage(
404 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
405 page->index);
406
407 return block_write_full_page(page, ocfs2_get_block, wbc);
408}
409
410
411
412
413
414int walk_page_buffers( handle_t *handle,
415 struct buffer_head *head,
416 unsigned from,
417 unsigned to,
418 int *partial,
419 int (*fn)( handle_t *handle,
420 struct buffer_head *bh))
421{
422 struct buffer_head *bh;
423 unsigned block_start, block_end;
424 unsigned blocksize = head->b_size;
425 int err, ret = 0;
426 struct buffer_head *next;
427
428 for ( bh = head, block_start = 0;
429 ret == 0 && (bh != head || !block_start);
430 block_start = block_end, bh = next)
431 {
432 next = bh->b_this_page;
433 block_end = block_start + blocksize;
434 if (block_end <= from || block_start >= to) {
435 if (partial && !buffer_uptodate(bh))
436 *partial = 1;
437 continue;
438 }
439 err = (*fn)(handle, bh);
440 if (!ret)
441 ret = err;
442 }
443 return ret;
444}
445
446static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
447{
448 sector_t status;
449 u64 p_blkno = 0;
450 int err = 0;
451 struct inode *inode = mapping->host;
452
453 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
454 (unsigned long long)block);
455
456
457
458
459
460
461
462 if (ocfs2_is_refcount_inode(inode))
463 return 0;
464
465
466
467
468 if (!INODE_JOURNAL(inode)) {
469 err = ocfs2_inode_lock(inode, NULL, 0);
470 if (err) {
471 if (err != -ENOENT)
472 mlog_errno(err);
473 goto bail;
474 }
475 down_read(&OCFS2_I(inode)->ip_alloc_sem);
476 }
477
478 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
479 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
480 NULL);
481
482 if (!INODE_JOURNAL(inode)) {
483 up_read(&OCFS2_I(inode)->ip_alloc_sem);
484 ocfs2_inode_unlock(inode, 0);
485 }
486
487 if (err) {
488 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
489 (unsigned long long)block);
490 mlog_errno(err);
491 goto bail;
492 }
493
494bail:
495 status = err ? 0 : p_blkno;
496
497 return status;
498}
499
500static int ocfs2_releasepage(struct page *page, gfp_t wait)
501{
502 if (!page_has_buffers(page))
503 return 0;
504 return try_to_free_buffers(page);
505}
506
507static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
508 u32 cpos,
509 unsigned int *start,
510 unsigned int *end)
511{
512 unsigned int cluster_start = 0, cluster_end = PAGE_SIZE;
513
514 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) {
515 unsigned int cpp;
516
517 cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits);
518
519 cluster_start = cpos % cpp;
520 cluster_start = cluster_start << osb->s_clustersize_bits;
521
522 cluster_end = cluster_start + osb->s_clustersize;
523 }
524
525 BUG_ON(cluster_start > PAGE_SIZE);
526 BUG_ON(cluster_end > PAGE_SIZE);
527
528 if (start)
529 *start = cluster_start;
530 if (end)
531 *end = cluster_end;
532}
533
534
535
536
537
538
539
540
541
542static void ocfs2_clear_page_regions(struct page *page,
543 struct ocfs2_super *osb, u32 cpos,
544 unsigned from, unsigned to)
545{
546 void *kaddr;
547 unsigned int cluster_start, cluster_end;
548
549 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
550
551 kaddr = kmap_atomic(page);
552
553 if (from || to) {
554 if (from > cluster_start)
555 memset(kaddr + cluster_start, 0, from - cluster_start);
556 if (to < cluster_end)
557 memset(kaddr + to, 0, cluster_end - to);
558 } else {
559 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
560 }
561
562 kunmap_atomic(kaddr);
563}
564
565
566
567
568
569
570
571
572static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
573 unsigned int block_start)
574{
575 u64 offset = page_offset(page) + block_start;
576
577 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
578 return 1;
579
580 if (i_size_read(inode) > offset)
581 return 1;
582
583 return 0;
584}
585
586
587
588
589
590
591
592
593int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
594 struct inode *inode, unsigned int from,
595 unsigned int to, int new)
596{
597 int ret = 0;
598 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
599 unsigned int block_end, block_start;
600 unsigned int bsize = i_blocksize(inode);
601
602 if (!page_has_buffers(page))
603 create_empty_buffers(page, bsize, 0);
604
605 head = page_buffers(page);
606 for (bh = head, block_start = 0; bh != head || !block_start;
607 bh = bh->b_this_page, block_start += bsize) {
608 block_end = block_start + bsize;
609
610 clear_buffer_new(bh);
611
612
613
614
615
616 if (block_start >= to || block_end <= from) {
617 if (PageUptodate(page))
618 set_buffer_uptodate(bh);
619 continue;
620 }
621
622
623
624
625
626 if (new)
627 set_buffer_new(bh);
628
629 if (!buffer_mapped(bh)) {
630 map_bh(bh, inode->i_sb, *p_blkno);
631 clean_bdev_bh_alias(bh);
632 }
633
634 if (PageUptodate(page)) {
635 set_buffer_uptodate(bh);
636 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
637 !buffer_new(bh) &&
638 ocfs2_should_read_blk(inode, page, block_start) &&
639 (block_start < from || block_end > to)) {
640 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
641 *wait_bh++=bh;
642 }
643
644 *p_blkno = *p_blkno + 1;
645 }
646
647
648
649
650 while(wait_bh > wait) {
651 wait_on_buffer(*--wait_bh);
652 if (!buffer_uptodate(*wait_bh))
653 ret = -EIO;
654 }
655
656 if (ret == 0 || !new)
657 return ret;
658
659
660
661
662
663 bh = head;
664 block_start = 0;
665 do {
666 block_end = block_start + bsize;
667 if (block_end <= from)
668 goto next_bh;
669 if (block_start >= to)
670 break;
671
672 zero_user(page, block_start, bh->b_size);
673 set_buffer_uptodate(bh);
674 mark_buffer_dirty(bh);
675
676next_bh:
677 block_start = block_end;
678 bh = bh->b_this_page;
679 } while (bh != head);
680
681 return ret;
682}
683
684#if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
685#define OCFS2_MAX_CTXT_PAGES 1
686#else
687#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE)
688#endif
689
690#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE)
691
692struct ocfs2_unwritten_extent {
693 struct list_head ue_node;
694 struct list_head ue_ip_node;
695 u32 ue_cpos;
696 u32 ue_phys;
697};
698
699
700
701
702struct ocfs2_write_cluster_desc {
703 u32 c_cpos;
704 u32 c_phys;
705
706
707
708
709 unsigned c_new;
710 unsigned c_clear_unwritten;
711 unsigned c_needs_zero;
712};
713
714struct ocfs2_write_ctxt {
715
716 u32 w_cpos;
717 u32 w_clen;
718
719
720 u32 w_first_new_cpos;
721
722
723 ocfs2_write_type_t w_type;
724
725 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
726
727
728
729
730
731
732
733 unsigned int w_large_pages;
734
735
736
737
738
739
740
741
742
743
744
745
746
747 unsigned int w_num_pages;
748 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
749 struct page *w_target_page;
750
751
752
753
754
755 unsigned int w_target_locked:1;
756
757
758
759
760
761 unsigned int w_target_from;
762 unsigned int w_target_to;
763
764
765
766
767
768 handle_t *w_handle;
769
770 struct buffer_head *w_di_bh;
771
772 struct ocfs2_cached_dealloc_ctxt w_dealloc;
773
774 struct list_head w_unwritten_list;
775 unsigned int w_unwritten_count;
776};
777
778void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
779{
780 int i;
781
782 for(i = 0; i < num_pages; i++) {
783 if (pages[i]) {
784 unlock_page(pages[i]);
785 mark_page_accessed(pages[i]);
786 put_page(pages[i]);
787 }
788 }
789}
790
791static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc)
792{
793 int i;
794
795
796
797
798
799
800 if (wc->w_target_locked) {
801 BUG_ON(!wc->w_target_page);
802 for (i = 0; i < wc->w_num_pages; i++) {
803 if (wc->w_target_page == wc->w_pages[i]) {
804 wc->w_pages[i] = NULL;
805 break;
806 }
807 }
808 mark_page_accessed(wc->w_target_page);
809 put_page(wc->w_target_page);
810 }
811 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
812}
813
814static void ocfs2_free_unwritten_list(struct inode *inode,
815 struct list_head *head)
816{
817 struct ocfs2_inode_info *oi = OCFS2_I(inode);
818 struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL;
819
820 list_for_each_entry_safe(ue, tmp, head, ue_node) {
821 list_del(&ue->ue_node);
822 spin_lock(&oi->ip_lock);
823 list_del(&ue->ue_ip_node);
824 spin_unlock(&oi->ip_lock);
825 kfree(ue);
826 }
827}
828
829static void ocfs2_free_write_ctxt(struct inode *inode,
830 struct ocfs2_write_ctxt *wc)
831{
832 ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list);
833 ocfs2_unlock_pages(wc);
834 brelse(wc->w_di_bh);
835 kfree(wc);
836}
837
838static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
839 struct ocfs2_super *osb, loff_t pos,
840 unsigned len, ocfs2_write_type_t type,
841 struct buffer_head *di_bh)
842{
843 u32 cend;
844 struct ocfs2_write_ctxt *wc;
845
846 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
847 if (!wc)
848 return -ENOMEM;
849
850 wc->w_cpos = pos >> osb->s_clustersize_bits;
851 wc->w_first_new_cpos = UINT_MAX;
852 cend = (pos + len - 1) >> osb->s_clustersize_bits;
853 wc->w_clen = cend - wc->w_cpos + 1;
854 get_bh(di_bh);
855 wc->w_di_bh = di_bh;
856 wc->w_type = type;
857
858 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits))
859 wc->w_large_pages = 1;
860 else
861 wc->w_large_pages = 0;
862
863 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
864 INIT_LIST_HEAD(&wc->w_unwritten_list);
865
866 *wcp = wc;
867
868 return 0;
869}
870
871
872
873
874
875
876static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
877{
878 unsigned int block_start, block_end;
879 struct buffer_head *head, *bh;
880
881 BUG_ON(!PageLocked(page));
882 if (!page_has_buffers(page))
883 return;
884
885 bh = head = page_buffers(page);
886 block_start = 0;
887 do {
888 block_end = block_start + bh->b_size;
889
890 if (buffer_new(bh)) {
891 if (block_end > from && block_start < to) {
892 if (!PageUptodate(page)) {
893 unsigned start, end;
894
895 start = max(from, block_start);
896 end = min(to, block_end);
897
898 zero_user_segment(page, start, end);
899 set_buffer_uptodate(bh);
900 }
901
902 clear_buffer_new(bh);
903 mark_buffer_dirty(bh);
904 }
905 }
906
907 block_start = block_end;
908 bh = bh->b_this_page;
909 } while (bh != head);
910}
911
912
913
914
915
916static void ocfs2_write_failure(struct inode *inode,
917 struct ocfs2_write_ctxt *wc,
918 loff_t user_pos, unsigned user_len)
919{
920 int i;
921 unsigned from = user_pos & (PAGE_SIZE - 1),
922 to = user_pos + user_len;
923 struct page *tmppage;
924
925 if (wc->w_target_page)
926 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
927
928 for(i = 0; i < wc->w_num_pages; i++) {
929 tmppage = wc->w_pages[i];
930
931 if (tmppage && page_has_buffers(tmppage)) {
932 if (ocfs2_should_order_data(inode))
933 ocfs2_jbd2_inode_add_write(wc->w_handle, inode,
934 user_pos, user_len);
935
936 block_commit_write(tmppage, from, to);
937 }
938 }
939}
940
941static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
942 struct ocfs2_write_ctxt *wc,
943 struct page *page, u32 cpos,
944 loff_t user_pos, unsigned user_len,
945 int new)
946{
947 int ret;
948 unsigned int map_from = 0, map_to = 0;
949 unsigned int cluster_start, cluster_end;
950 unsigned int user_data_from = 0, user_data_to = 0;
951
952 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
953 &cluster_start, &cluster_end);
954
955
956
957
958 new = new | ((i_size_read(inode) <= page_offset(page)) &&
959 (page_offset(page) <= user_pos));
960
961 if (page == wc->w_target_page) {
962 map_from = user_pos & (PAGE_SIZE - 1);
963 map_to = map_from + user_len;
964
965 if (new)
966 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
967 cluster_start, cluster_end,
968 new);
969 else
970 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
971 map_from, map_to, new);
972 if (ret) {
973 mlog_errno(ret);
974 goto out;
975 }
976
977 user_data_from = map_from;
978 user_data_to = map_to;
979 if (new) {
980 map_from = cluster_start;
981 map_to = cluster_end;
982 }
983 } else {
984
985
986
987
988
989 BUG_ON(!new);
990
991 map_from = cluster_start;
992 map_to = cluster_end;
993
994 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
995 cluster_start, cluster_end, new);
996 if (ret) {
997 mlog_errno(ret);
998 goto out;
999 }
1000 }
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012 if (new && !PageUptodate(page))
1013 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1014 cpos, user_data_from, user_data_to);
1015
1016 flush_dcache_page(page);
1017
1018out:
1019 return ret;
1020}
1021
1022
1023
1024
1025static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1026 struct ocfs2_write_ctxt *wc,
1027 u32 cpos, loff_t user_pos,
1028 unsigned user_len, int new,
1029 struct page *mmap_page)
1030{
1031 int ret = 0, i;
1032 unsigned long start, target_index, end_index, index;
1033 struct inode *inode = mapping->host;
1034 loff_t last_byte;
1035
1036 target_index = user_pos >> PAGE_SHIFT;
1037
1038
1039
1040
1041
1042
1043
1044
1045 if (new) {
1046 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1047 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1048
1049
1050
1051
1052
1053 last_byte = max(user_pos + user_len, i_size_read(inode));
1054 BUG_ON(last_byte < 1);
1055 end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1;
1056 if ((start + wc->w_num_pages) > end_index)
1057 wc->w_num_pages = end_index - start;
1058 } else {
1059 wc->w_num_pages = 1;
1060 start = target_index;
1061 }
1062 end_index = (user_pos + user_len - 1) >> PAGE_SHIFT;
1063
1064 for(i = 0; i < wc->w_num_pages; i++) {
1065 index = start + i;
1066
1067 if (index >= target_index && index <= end_index &&
1068 wc->w_type == OCFS2_WRITE_MMAP) {
1069
1070
1071
1072
1073
1074 lock_page(mmap_page);
1075
1076
1077 if (mmap_page->mapping != mapping) {
1078 WARN_ON(mmap_page->mapping);
1079 unlock_page(mmap_page);
1080 ret = -EAGAIN;
1081 goto out;
1082 }
1083
1084 get_page(mmap_page);
1085 wc->w_pages[i] = mmap_page;
1086 wc->w_target_locked = true;
1087 } else if (index >= target_index && index <= end_index &&
1088 wc->w_type == OCFS2_WRITE_DIRECT) {
1089
1090 wc->w_pages[i] = NULL;
1091 continue;
1092 } else {
1093 wc->w_pages[i] = find_or_create_page(mapping, index,
1094 GFP_NOFS);
1095 if (!wc->w_pages[i]) {
1096 ret = -ENOMEM;
1097 mlog_errno(ret);
1098 goto out;
1099 }
1100 }
1101 wait_for_stable_page(wc->w_pages[i]);
1102
1103 if (index == target_index)
1104 wc->w_target_page = wc->w_pages[i];
1105 }
1106out:
1107 if (ret)
1108 wc->w_target_locked = false;
1109 return ret;
1110}
1111
1112
1113
1114
1115static int ocfs2_write_cluster(struct address_space *mapping,
1116 u32 *phys, unsigned int new,
1117 unsigned int clear_unwritten,
1118 unsigned int should_zero,
1119 struct ocfs2_alloc_context *data_ac,
1120 struct ocfs2_alloc_context *meta_ac,
1121 struct ocfs2_write_ctxt *wc, u32 cpos,
1122 loff_t user_pos, unsigned user_len)
1123{
1124 int ret, i;
1125 u64 p_blkno;
1126 struct inode *inode = mapping->host;
1127 struct ocfs2_extent_tree et;
1128 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1129
1130 if (new) {
1131 u32 tmp_pos;
1132
1133
1134
1135
1136
1137 tmp_pos = cpos;
1138 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1139 &tmp_pos, 1, !clear_unwritten,
1140 wc->w_di_bh, wc->w_handle,
1141 data_ac, meta_ac, NULL);
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151 mlog_bug_on_msg(ret == -EAGAIN,
1152 "Inode %llu: EAGAIN return during allocation.\n",
1153 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1154 if (ret < 0) {
1155 mlog_errno(ret);
1156 goto out;
1157 }
1158 } else if (clear_unwritten) {
1159 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1160 wc->w_di_bh);
1161 ret = ocfs2_mark_extent_written(inode, &et,
1162 wc->w_handle, cpos, 1, *phys,
1163 meta_ac, &wc->w_dealloc);
1164 if (ret < 0) {
1165 mlog_errno(ret);
1166 goto out;
1167 }
1168 }
1169
1170
1171
1172
1173
1174 ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL);
1175 if (ret < 0) {
1176 mlog(ML_ERROR, "Get physical blkno failed for inode %llu, "
1177 "at logical cluster %u",
1178 (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
1179 goto out;
1180 }
1181
1182 BUG_ON(*phys == 0);
1183
1184 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys);
1185 if (!should_zero)
1186 p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1);
1187
1188 for(i = 0; i < wc->w_num_pages; i++) {
1189 int tmpret;
1190
1191
1192 if (wc->w_pages[i] == NULL) {
1193 p_blkno++;
1194 continue;
1195 }
1196
1197 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1198 wc->w_pages[i], cpos,
1199 user_pos, user_len,
1200 should_zero);
1201 if (tmpret) {
1202 mlog_errno(tmpret);
1203 if (ret == 0)
1204 ret = tmpret;
1205 }
1206 }
1207
1208
1209
1210
1211 if (ret && new)
1212 ocfs2_write_failure(inode, wc, user_pos, user_len);
1213
1214out:
1215
1216 return ret;
1217}
1218
1219static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1220 struct ocfs2_alloc_context *data_ac,
1221 struct ocfs2_alloc_context *meta_ac,
1222 struct ocfs2_write_ctxt *wc,
1223 loff_t pos, unsigned len)
1224{
1225 int ret, i;
1226 loff_t cluster_off;
1227 unsigned int local_len = len;
1228 struct ocfs2_write_cluster_desc *desc;
1229 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1230
1231 for (i = 0; i < wc->w_clen; i++) {
1232 desc = &wc->w_desc[i];
1233
1234
1235
1236
1237
1238 local_len = len;
1239 cluster_off = pos & (osb->s_clustersize - 1);
1240 if ((cluster_off + local_len) > osb->s_clustersize)
1241 local_len = osb->s_clustersize - cluster_off;
1242
1243 ret = ocfs2_write_cluster(mapping, &desc->c_phys,
1244 desc->c_new,
1245 desc->c_clear_unwritten,
1246 desc->c_needs_zero,
1247 data_ac, meta_ac,
1248 wc, desc->c_cpos, pos, local_len);
1249 if (ret) {
1250 mlog_errno(ret);
1251 goto out;
1252 }
1253
1254 len -= local_len;
1255 pos += local_len;
1256 }
1257
1258 ret = 0;
1259out:
1260 return ret;
1261}
1262
1263
1264
1265
1266
1267
1268static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1269 struct ocfs2_write_ctxt *wc,
1270 loff_t pos, unsigned len, int alloc)
1271{
1272 struct ocfs2_write_cluster_desc *desc;
1273
1274 wc->w_target_from = pos & (PAGE_SIZE - 1);
1275 wc->w_target_to = wc->w_target_from + len;
1276
1277 if (alloc == 0)
1278 return;
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289 if (wc->w_large_pages) {
1290
1291
1292
1293
1294
1295
1296 desc = &wc->w_desc[0];
1297 if (desc->c_needs_zero)
1298 ocfs2_figure_cluster_boundaries(osb,
1299 desc->c_cpos,
1300 &wc->w_target_from,
1301 NULL);
1302
1303 desc = &wc->w_desc[wc->w_clen - 1];
1304 if (desc->c_needs_zero)
1305 ocfs2_figure_cluster_boundaries(osb,
1306 desc->c_cpos,
1307 NULL,
1308 &wc->w_target_to);
1309 } else {
1310 wc->w_target_from = 0;
1311 wc->w_target_to = PAGE_SIZE;
1312 }
1313}
1314
1315
1316
1317
1318
1319
1320
1321
1322static int ocfs2_unwritten_check(struct inode *inode,
1323 struct ocfs2_write_ctxt *wc,
1324 struct ocfs2_write_cluster_desc *desc)
1325{
1326 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1327 struct ocfs2_unwritten_extent *ue = NULL, *new = NULL;
1328 int ret = 0;
1329
1330 if (!desc->c_needs_zero)
1331 return 0;
1332
1333retry:
1334 spin_lock(&oi->ip_lock);
1335
1336
1337
1338 list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) {
1339 if (desc->c_cpos == ue->ue_cpos) {
1340 BUG_ON(desc->c_new);
1341 desc->c_needs_zero = 0;
1342 desc->c_clear_unwritten = 0;
1343 goto unlock;
1344 }
1345 }
1346
1347 if (wc->w_type != OCFS2_WRITE_DIRECT)
1348 goto unlock;
1349
1350 if (new == NULL) {
1351 spin_unlock(&oi->ip_lock);
1352 new = kmalloc(sizeof(struct ocfs2_unwritten_extent),
1353 GFP_NOFS);
1354 if (new == NULL) {
1355 ret = -ENOMEM;
1356 goto out;
1357 }
1358 goto retry;
1359 }
1360
1361 new->ue_cpos = desc->c_cpos;
1362 new->ue_phys = desc->c_phys;
1363 desc->c_clear_unwritten = 0;
1364 list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list);
1365 list_add_tail(&new->ue_node, &wc->w_unwritten_list);
1366 wc->w_unwritten_count++;
1367 new = NULL;
1368unlock:
1369 spin_unlock(&oi->ip_lock);
1370out:
1371 kfree(new);
1372 return ret;
1373}
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383static int ocfs2_populate_write_desc(struct inode *inode,
1384 struct ocfs2_write_ctxt *wc,
1385 unsigned int *clusters_to_alloc,
1386 unsigned int *extents_to_split)
1387{
1388 int ret;
1389 struct ocfs2_write_cluster_desc *desc;
1390 unsigned int num_clusters = 0;
1391 unsigned int ext_flags = 0;
1392 u32 phys = 0;
1393 int i;
1394
1395 *clusters_to_alloc = 0;
1396 *extents_to_split = 0;
1397
1398 for (i = 0; i < wc->w_clen; i++) {
1399 desc = &wc->w_desc[i];
1400 desc->c_cpos = wc->w_cpos + i;
1401
1402 if (num_clusters == 0) {
1403
1404
1405
1406 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1407 &num_clusters, &ext_flags);
1408 if (ret) {
1409 mlog_errno(ret);
1410 goto out;
1411 }
1412
1413
1414 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1426 *extents_to_split = *extents_to_split + 2;
1427 } else if (phys) {
1428
1429
1430
1431
1432 phys++;
1433 }
1434
1435
1436
1437
1438
1439
1440
1441 if (desc->c_cpos >= wc->w_first_new_cpos) {
1442 BUG_ON(phys == 0);
1443 desc->c_needs_zero = 1;
1444 }
1445
1446 desc->c_phys = phys;
1447 if (phys == 0) {
1448 desc->c_new = 1;
1449 desc->c_needs_zero = 1;
1450 desc->c_clear_unwritten = 1;
1451 *clusters_to_alloc = *clusters_to_alloc + 1;
1452 }
1453
1454 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
1455 desc->c_clear_unwritten = 1;
1456 desc->c_needs_zero = 1;
1457 }
1458
1459 ret = ocfs2_unwritten_check(inode, wc, desc);
1460 if (ret) {
1461 mlog_errno(ret);
1462 goto out;
1463 }
1464
1465 num_clusters--;
1466 }
1467
1468 ret = 0;
1469out:
1470 return ret;
1471}
1472
1473static int ocfs2_write_begin_inline(struct address_space *mapping,
1474 struct inode *inode,
1475 struct ocfs2_write_ctxt *wc)
1476{
1477 int ret;
1478 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1479 struct page *page;
1480 handle_t *handle;
1481 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1482
1483 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1484 if (IS_ERR(handle)) {
1485 ret = PTR_ERR(handle);
1486 mlog_errno(ret);
1487 goto out;
1488 }
1489
1490 page = find_or_create_page(mapping, 0, GFP_NOFS);
1491 if (!page) {
1492 ocfs2_commit_trans(osb, handle);
1493 ret = -ENOMEM;
1494 mlog_errno(ret);
1495 goto out;
1496 }
1497
1498
1499
1500
1501 wc->w_pages[0] = wc->w_target_page = page;
1502 wc->w_num_pages = 1;
1503
1504 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1505 OCFS2_JOURNAL_ACCESS_WRITE);
1506 if (ret) {
1507 ocfs2_commit_trans(osb, handle);
1508
1509 mlog_errno(ret);
1510 goto out;
1511 }
1512
1513 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1514 ocfs2_set_inode_data_inline(inode, di);
1515
1516 if (!PageUptodate(page)) {
1517 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1518 if (ret) {
1519 ocfs2_commit_trans(osb, handle);
1520
1521 goto out;
1522 }
1523 }
1524
1525 wc->w_handle = handle;
1526out:
1527 return ret;
1528}
1529
1530int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1531{
1532 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1533
1534 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1535 return 1;
1536 return 0;
1537}
1538
1539static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1540 struct inode *inode, loff_t pos,
1541 unsigned len, struct page *mmap_page,
1542 struct ocfs2_write_ctxt *wc)
1543{
1544 int ret, written = 0;
1545 loff_t end = pos + len;
1546 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1547 struct ocfs2_dinode *di = NULL;
1548
1549 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1550 len, (unsigned long long)pos,
1551 oi->ip_dyn_features);
1552
1553
1554
1555
1556 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1557 if (mmap_page == NULL &&
1558 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1559 goto do_inline_write;
1560
1561
1562
1563
1564
1565 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1566 if (ret)
1567 mlog_errno(ret);
1568 goto out;
1569 }
1570
1571
1572
1573
1574 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1575 return 0;
1576
1577
1578
1579
1580 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1581 if (mmap_page ||
1582 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
1583 return 0;
1584
1585do_inline_write:
1586 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1587 if (ret) {
1588 mlog_errno(ret);
1589 goto out;
1590 }
1591
1592
1593
1594
1595
1596 written = 1;
1597out:
1598 return written ? written : ret;
1599}
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1611 struct buffer_head *di_bh,
1612 loff_t pos, unsigned len,
1613 struct ocfs2_write_ctxt *wc)
1614{
1615 int ret;
1616 loff_t newsize = pos + len;
1617
1618 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1619
1620 if (newsize <= i_size_read(inode))
1621 return 0;
1622
1623 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
1624 if (ret)
1625 mlog_errno(ret);
1626
1627
1628 if (wc)
1629 wc->w_first_new_cpos =
1630 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1631
1632 return ret;
1633}
1634
1635static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1636 loff_t pos)
1637{
1638 int ret = 0;
1639
1640 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1641 if (pos > i_size_read(inode))
1642 ret = ocfs2_zero_extend(inode, di_bh, pos);
1643
1644 return ret;
1645}
1646
1647int ocfs2_write_begin_nolock(struct address_space *mapping,
1648 loff_t pos, unsigned len, ocfs2_write_type_t type,
1649 struct page **pagep, void **fsdata,
1650 struct buffer_head *di_bh, struct page *mmap_page)
1651{
1652 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
1653 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
1654 struct ocfs2_write_ctxt *wc;
1655 struct inode *inode = mapping->host;
1656 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1657 struct ocfs2_dinode *di;
1658 struct ocfs2_alloc_context *data_ac = NULL;
1659 struct ocfs2_alloc_context *meta_ac = NULL;
1660 handle_t *handle;
1661 struct ocfs2_extent_tree et;
1662 int try_free = 1, ret1;
1663
1664try_again:
1665 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh);
1666 if (ret) {
1667 mlog_errno(ret);
1668 return ret;
1669 }
1670
1671 if (ocfs2_supports_inline_data(osb)) {
1672 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1673 mmap_page, wc);
1674 if (ret == 1) {
1675 ret = 0;
1676 goto success;
1677 }
1678 if (ret < 0) {
1679 mlog_errno(ret);
1680 goto out;
1681 }
1682 }
1683
1684
1685 if (type != OCFS2_WRITE_DIRECT) {
1686 if (ocfs2_sparse_alloc(osb))
1687 ret = ocfs2_zero_tail(inode, di_bh, pos);
1688 else
1689 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
1690 len, wc);
1691 if (ret) {
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695 }
1696
1697 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1698 if (ret < 0) {
1699 mlog_errno(ret);
1700 goto out;
1701 } else if (ret == 1) {
1702 clusters_need = wc->w_clen;
1703 ret = ocfs2_refcount_cow(inode, di_bh,
1704 wc->w_cpos, wc->w_clen, UINT_MAX);
1705 if (ret) {
1706 mlog_errno(ret);
1707 goto out;
1708 }
1709 }
1710
1711 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1712 &extents_to_split);
1713 if (ret) {
1714 mlog_errno(ret);
1715 goto out;
1716 }
1717 clusters_need += clusters_to_alloc;
1718
1719 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1720
1721 trace_ocfs2_write_begin_nolock(
1722 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1723 (long long)i_size_read(inode),
1724 le32_to_cpu(di->i_clusters),
1725 pos, len, type, mmap_page,
1726 clusters_to_alloc, extents_to_split);
1727
1728
1729
1730
1731
1732
1733
1734 if (clusters_to_alloc || extents_to_split) {
1735
1736
1737
1738
1739
1740 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1741 wc->w_di_bh);
1742 ret = ocfs2_lock_allocators(inode, &et,
1743 clusters_to_alloc, extents_to_split,
1744 &data_ac, &meta_ac);
1745 if (ret) {
1746 mlog_errno(ret);
1747 goto out;
1748 }
1749
1750 if (data_ac)
1751 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1752
1753 credits = ocfs2_calc_extend_credits(inode->i_sb,
1754 &di->id2.i_list);
1755 } else if (type == OCFS2_WRITE_DIRECT)
1756
1757 goto success;
1758
1759
1760
1761
1762
1763
1764 if (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1765 wc->w_desc[wc->w_clen - 1].c_needs_zero))
1766 cluster_of_pages = 1;
1767 else
1768 cluster_of_pages = 0;
1769
1770 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
1771
1772 handle = ocfs2_start_trans(osb, credits);
1773 if (IS_ERR(handle)) {
1774 ret = PTR_ERR(handle);
1775 mlog_errno(ret);
1776 goto out;
1777 }
1778
1779 wc->w_handle = handle;
1780
1781 if (clusters_to_alloc) {
1782 ret = dquot_alloc_space_nodirty(inode,
1783 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1784 if (ret)
1785 goto out_commit;
1786 }
1787
1788 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1789 OCFS2_JOURNAL_ACCESS_WRITE);
1790 if (ret) {
1791 mlog_errno(ret);
1792 goto out_quota;
1793 }
1794
1795
1796
1797
1798
1799
1800 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
1801 cluster_of_pages, mmap_page);
1802 if (ret && ret != -EAGAIN) {
1803 mlog_errno(ret);
1804 goto out_quota;
1805 }
1806
1807
1808
1809
1810
1811
1812
1813 if (ret == -EAGAIN) {
1814 BUG_ON(wc->w_target_page);
1815 ret = 0;
1816 goto out_quota;
1817 }
1818
1819 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1820 len);
1821 if (ret) {
1822 mlog_errno(ret);
1823 goto out_quota;
1824 }
1825
1826 if (data_ac)
1827 ocfs2_free_alloc_context(data_ac);
1828 if (meta_ac)
1829 ocfs2_free_alloc_context(meta_ac);
1830
1831success:
1832 if (pagep)
1833 *pagep = wc->w_target_page;
1834 *fsdata = wc;
1835 return 0;
1836out_quota:
1837 if (clusters_to_alloc)
1838 dquot_free_space(inode,
1839 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1840out_commit:
1841 ocfs2_commit_trans(osb, handle);
1842
1843out:
1844
1845
1846
1847
1848
1849
1850
1851 if (wc->w_target_locked)
1852 unlock_page(mmap_page);
1853
1854 ocfs2_free_write_ctxt(inode, wc);
1855
1856 if (data_ac) {
1857 ocfs2_free_alloc_context(data_ac);
1858 data_ac = NULL;
1859 }
1860 if (meta_ac) {
1861 ocfs2_free_alloc_context(meta_ac);
1862 meta_ac = NULL;
1863 }
1864
1865 if (ret == -ENOSPC && try_free) {
1866
1867
1868
1869
1870 try_free = 0;
1871
1872 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1873 if (ret1 == 1)
1874 goto try_again;
1875
1876 if (ret1 < 0)
1877 mlog_errno(ret1);
1878 }
1879
1880 return ret;
1881}
1882
1883static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1884 loff_t pos, unsigned len, unsigned flags,
1885 struct page **pagep, void **fsdata)
1886{
1887 int ret;
1888 struct buffer_head *di_bh = NULL;
1889 struct inode *inode = mapping->host;
1890
1891 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1892 if (ret) {
1893 mlog_errno(ret);
1894 return ret;
1895 }
1896
1897
1898
1899
1900
1901
1902
1903
1904 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1905
1906 ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER,
1907 pagep, fsdata, di_bh, NULL);
1908 if (ret) {
1909 mlog_errno(ret);
1910 goto out_fail;
1911 }
1912
1913 brelse(di_bh);
1914
1915 return 0;
1916
1917out_fail:
1918 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1919
1920 brelse(di_bh);
1921 ocfs2_inode_unlock(inode, 1);
1922
1923 return ret;
1924}
1925
1926static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1927 unsigned len, unsigned *copied,
1928 struct ocfs2_dinode *di,
1929 struct ocfs2_write_ctxt *wc)
1930{
1931 void *kaddr;
1932
1933 if (unlikely(*copied < len)) {
1934 if (!PageUptodate(wc->w_target_page)) {
1935 *copied = 0;
1936 return;
1937 }
1938 }
1939
1940 kaddr = kmap_atomic(wc->w_target_page);
1941 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1942 kunmap_atomic(kaddr);
1943
1944 trace_ocfs2_write_end_inline(
1945 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1946 (unsigned long long)pos, *copied,
1947 le16_to_cpu(di->id2.i_data.id_count),
1948 le16_to_cpu(di->i_dyn_features));
1949}
1950
1951int ocfs2_write_end_nolock(struct address_space *mapping,
1952 loff_t pos, unsigned len, unsigned copied, void *fsdata)
1953{
1954 int i, ret;
1955 unsigned from, to, start = pos & (PAGE_SIZE - 1);
1956 struct inode *inode = mapping->host;
1957 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1958 struct ocfs2_write_ctxt *wc = fsdata;
1959 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1960 handle_t *handle = wc->w_handle;
1961 struct page *tmppage;
1962
1963 BUG_ON(!list_empty(&wc->w_unwritten_list));
1964
1965 if (handle) {
1966 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
1967 wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1968 if (ret) {
1969 copied = ret;
1970 mlog_errno(ret);
1971 goto out;
1972 }
1973 }
1974
1975 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1976 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1977 goto out_write_size;
1978 }
1979
1980 if (unlikely(copied < len) && wc->w_target_page) {
1981 if (!PageUptodate(wc->w_target_page))
1982 copied = 0;
1983
1984 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1985 start+len);
1986 }
1987 if (wc->w_target_page)
1988 flush_dcache_page(wc->w_target_page);
1989
1990 for(i = 0; i < wc->w_num_pages; i++) {
1991 tmppage = wc->w_pages[i];
1992
1993
1994 if (tmppage == NULL)
1995 continue;
1996
1997 if (tmppage == wc->w_target_page) {
1998 from = wc->w_target_from;
1999 to = wc->w_target_to;
2000
2001 BUG_ON(from > PAGE_SIZE ||
2002 to > PAGE_SIZE ||
2003 to < from);
2004 } else {
2005
2006
2007
2008
2009
2010 from = 0;
2011 to = PAGE_SIZE;
2012 }
2013
2014 if (page_has_buffers(tmppage)) {
2015 if (handle && ocfs2_should_order_data(inode)) {
2016 loff_t start_byte =
2017 ((loff_t)tmppage->index << PAGE_SHIFT) +
2018 from;
2019 loff_t length = to - from;
2020 ocfs2_jbd2_inode_add_write(handle, inode,
2021 start_byte, length);
2022 }
2023 block_commit_write(tmppage, from, to);
2024 }
2025 }
2026
2027out_write_size:
2028
2029 if (wc->w_type != OCFS2_WRITE_DIRECT) {
2030 pos += copied;
2031 if (pos > i_size_read(inode)) {
2032 i_size_write(inode, pos);
2033 mark_inode_dirty(inode);
2034 }
2035 inode->i_blocks = ocfs2_inode_sector_count(inode);
2036 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2037 inode->i_mtime = inode->i_ctime = current_time(inode);
2038 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2039 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
2040 if (handle)
2041 ocfs2_update_inode_fsync_trans(handle, inode, 1);
2042 }
2043 if (handle)
2044 ocfs2_journal_dirty(handle, wc->w_di_bh);
2045
2046out:
2047
2048
2049
2050
2051
2052 ocfs2_unlock_pages(wc);
2053
2054 if (handle)
2055 ocfs2_commit_trans(osb, handle);
2056
2057 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2058
2059 brelse(wc->w_di_bh);
2060 kfree(wc);
2061
2062 return copied;
2063}
2064
2065static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2066 loff_t pos, unsigned len, unsigned copied,
2067 struct page *page, void *fsdata)
2068{
2069 int ret;
2070 struct inode *inode = mapping->host;
2071
2072 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, fsdata);
2073
2074 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2075 ocfs2_inode_unlock(inode, 1);
2076
2077 return ret;
2078}
2079
2080struct ocfs2_dio_write_ctxt {
2081 struct list_head dw_zero_list;
2082 unsigned dw_zero_count;
2083 int dw_orphaned;
2084 pid_t dw_writer_pid;
2085};
2086
2087static struct ocfs2_dio_write_ctxt *
2088ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc)
2089{
2090 struct ocfs2_dio_write_ctxt *dwc = NULL;
2091
2092 if (bh->b_private)
2093 return bh->b_private;
2094
2095 dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS);
2096 if (dwc == NULL)
2097 return NULL;
2098 INIT_LIST_HEAD(&dwc->dw_zero_list);
2099 dwc->dw_zero_count = 0;
2100 dwc->dw_orphaned = 0;
2101 dwc->dw_writer_pid = task_pid_nr(current);
2102 bh->b_private = dwc;
2103 *alloc = 1;
2104
2105 return dwc;
2106}
2107
2108static void ocfs2_dio_free_write_ctx(struct inode *inode,
2109 struct ocfs2_dio_write_ctxt *dwc)
2110{
2111 ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list);
2112 kfree(dwc);
2113}
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128static int ocfs2_dio_wr_get_block(struct inode *inode, sector_t iblock,
2129 struct buffer_head *bh_result, int create)
2130{
2131 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2132 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2133 struct ocfs2_write_ctxt *wc;
2134 struct ocfs2_write_cluster_desc *desc = NULL;
2135 struct ocfs2_dio_write_ctxt *dwc = NULL;
2136 struct buffer_head *di_bh = NULL;
2137 u64 p_blkno;
2138 unsigned int i_blkbits = inode->i_sb->s_blocksize_bits;
2139 loff_t pos = iblock << i_blkbits;
2140 sector_t endblk = (i_size_read(inode) - 1) >> i_blkbits;
2141 unsigned len, total_len = bh_result->b_size;
2142 int ret = 0, first_get_block = 0;
2143
2144 len = osb->s_clustersize - (pos & (osb->s_clustersize - 1));
2145 len = min(total_len, len);
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158 if ((iblock <= endblk) &&
2159 ((iblock + ((len - 1) >> i_blkbits)) > endblk))
2160 len = (endblk - iblock + 1) << i_blkbits;
2161
2162 mlog(0, "get block of %lu at %llu:%u req %u\n",
2163 inode->i_ino, pos, len, total_len);
2164
2165
2166
2167
2168
2169
2170 if (pos + total_len <= i_size_read(inode)) {
2171
2172
2173 ret = ocfs2_lock_get_block(inode, iblock, bh_result, create);
2174 if (buffer_mapped(bh_result) &&
2175 !buffer_new(bh_result) &&
2176 ret == 0)
2177 goto out;
2178
2179
2180 bh_result->b_state = 0;
2181 }
2182
2183 dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block);
2184 if (unlikely(dwc == NULL)) {
2185 ret = -ENOMEM;
2186 mlog_errno(ret);
2187 goto out;
2188 }
2189
2190 if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) >
2191 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) &&
2192 !dwc->dw_orphaned) {
2193
2194
2195
2196
2197
2198 ret = ocfs2_add_inode_to_orphan(osb, inode);
2199 if (ret < 0) {
2200 mlog_errno(ret);
2201 goto out;
2202 }
2203 dwc->dw_orphaned = 1;
2204 }
2205
2206 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2207 if (ret) {
2208 mlog_errno(ret);
2209 goto out;
2210 }
2211
2212 down_write(&oi->ip_alloc_sem);
2213
2214 if (first_get_block) {
2215 if (ocfs2_sparse_alloc(osb))
2216 ret = ocfs2_zero_tail(inode, di_bh, pos);
2217 else
2218 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
2219 total_len, NULL);
2220 if (ret < 0) {
2221 mlog_errno(ret);
2222 goto unlock;
2223 }
2224 }
2225
2226 ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len,
2227 OCFS2_WRITE_DIRECT, NULL,
2228 (void **)&wc, di_bh, NULL);
2229 if (ret) {
2230 mlog_errno(ret);
2231 goto unlock;
2232 }
2233
2234 desc = &wc->w_desc[0];
2235
2236 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys);
2237 BUG_ON(p_blkno == 0);
2238 p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1);
2239
2240 map_bh(bh_result, inode->i_sb, p_blkno);
2241 bh_result->b_size = len;
2242 if (desc->c_needs_zero)
2243 set_buffer_new(bh_result);
2244
2245 if (iblock > endblk)
2246 set_buffer_new(bh_result);
2247
2248
2249
2250 set_buffer_defer_completion(bh_result);
2251
2252 if (!list_empty(&wc->w_unwritten_list)) {
2253 struct ocfs2_unwritten_extent *ue = NULL;
2254
2255 ue = list_first_entry(&wc->w_unwritten_list,
2256 struct ocfs2_unwritten_extent,
2257 ue_node);
2258 BUG_ON(ue->ue_cpos != desc->c_cpos);
2259
2260 ue->ue_phys = desc->c_phys;
2261
2262 list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list);
2263 dwc->dw_zero_count += wc->w_unwritten_count;
2264 }
2265
2266 ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc);
2267 BUG_ON(ret != len);
2268 ret = 0;
2269unlock:
2270 up_write(&oi->ip_alloc_sem);
2271 ocfs2_inode_unlock(inode, 1);
2272 brelse(di_bh);
2273out:
2274 if (ret < 0)
2275 ret = -EIO;
2276 return ret;
2277}
2278
2279static int ocfs2_dio_end_io_write(struct inode *inode,
2280 struct ocfs2_dio_write_ctxt *dwc,
2281 loff_t offset,
2282 ssize_t bytes)
2283{
2284 struct ocfs2_cached_dealloc_ctxt dealloc;
2285 struct ocfs2_extent_tree et;
2286 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2287 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2288 struct ocfs2_unwritten_extent *ue = NULL;
2289 struct buffer_head *di_bh = NULL;
2290 struct ocfs2_dinode *di;
2291 struct ocfs2_alloc_context *data_ac = NULL;
2292 struct ocfs2_alloc_context *meta_ac = NULL;
2293 handle_t *handle = NULL;
2294 loff_t end = offset + bytes;
2295 int ret = 0, credits = 0;
2296
2297 ocfs2_init_dealloc_ctxt(&dealloc);
2298
2299
2300
2301 if (list_empty(&dwc->dw_zero_list) &&
2302 end <= i_size_read(inode) &&
2303 !dwc->dw_orphaned)
2304 goto out;
2305
2306 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2307 if (ret < 0) {
2308 mlog_errno(ret);
2309 goto out;
2310 }
2311
2312 down_write(&oi->ip_alloc_sem);
2313
2314
2315 if (dwc->dw_orphaned) {
2316 BUG_ON(dwc->dw_writer_pid != task_pid_nr(current));
2317
2318 end = end > i_size_read(inode) ? end : 0;
2319
2320 ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh,
2321 !!end, end);
2322 if (ret < 0)
2323 mlog_errno(ret);
2324 }
2325
2326 di = (struct ocfs2_dinode *)di_bh->b_data;
2327
2328 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
2329
2330
2331
2332
2333
2334 et.et_dealloc = &dealloc;
2335
2336 ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
2337 &data_ac, &meta_ac);
2338 if (ret) {
2339 mlog_errno(ret);
2340 goto unlock;
2341 }
2342
2343 credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list);
2344
2345 handle = ocfs2_start_trans(osb, credits);
2346 if (IS_ERR(handle)) {
2347 ret = PTR_ERR(handle);
2348 mlog_errno(ret);
2349 goto unlock;
2350 }
2351 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2352 OCFS2_JOURNAL_ACCESS_WRITE);
2353 if (ret) {
2354 mlog_errno(ret);
2355 goto commit;
2356 }
2357
2358 list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) {
2359 ret = ocfs2_mark_extent_written(inode, &et, handle,
2360 ue->ue_cpos, 1,
2361 ue->ue_phys,
2362 meta_ac, &dealloc);
2363 if (ret < 0) {
2364 mlog_errno(ret);
2365 break;
2366 }
2367 }
2368
2369 if (end > i_size_read(inode)) {
2370 ret = ocfs2_set_inode_size(handle, inode, di_bh, end);
2371 if (ret < 0)
2372 mlog_errno(ret);
2373 }
2374commit:
2375 ocfs2_commit_trans(osb, handle);
2376unlock:
2377 up_write(&oi->ip_alloc_sem);
2378 ocfs2_inode_unlock(inode, 1);
2379 brelse(di_bh);
2380out:
2381 if (data_ac)
2382 ocfs2_free_alloc_context(data_ac);
2383 if (meta_ac)
2384 ocfs2_free_alloc_context(meta_ac);
2385 ocfs2_run_deallocs(osb, &dealloc);
2386 ocfs2_dio_free_write_ctx(inode, dwc);
2387
2388 return ret;
2389}
2390
2391
2392
2393
2394
2395
2396static int ocfs2_dio_end_io(struct kiocb *iocb,
2397 loff_t offset,
2398 ssize_t bytes,
2399 void *private)
2400{
2401 struct inode *inode = file_inode(iocb->ki_filp);
2402 int level;
2403 int ret = 0;
2404
2405
2406 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
2407
2408 if (bytes <= 0)
2409 mlog_ratelimited(ML_ERROR, "Direct IO failed, bytes = %lld",
2410 (long long)bytes);
2411 if (private) {
2412 if (bytes > 0)
2413 ret = ocfs2_dio_end_io_write(inode, private, offset,
2414 bytes);
2415 else
2416 ocfs2_dio_free_write_ctx(inode, private);
2417 }
2418
2419 ocfs2_iocb_clear_rw_locked(iocb);
2420
2421 level = ocfs2_iocb_rw_locked_level(iocb);
2422 ocfs2_rw_unlock(inode, level);
2423 return ret;
2424}
2425
2426static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2427{
2428 struct file *file = iocb->ki_filp;
2429 struct inode *inode = file->f_mapping->host;
2430 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2431 get_block_t *get_block;
2432
2433
2434
2435
2436
2437 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2438 return 0;
2439
2440
2441 if (iocb->ki_pos + iter->count > i_size_read(inode) &&
2442 !ocfs2_supports_append_dio(osb))
2443 return 0;
2444
2445 if (iov_iter_rw(iter) == READ)
2446 get_block = ocfs2_lock_get_block;
2447 else
2448 get_block = ocfs2_dio_wr_get_block;
2449
2450 return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
2451 iter, get_block,
2452 ocfs2_dio_end_io, NULL, 0);
2453}
2454
2455const struct address_space_operations ocfs2_aops = {
2456 .set_page_dirty = __set_page_dirty_buffers,
2457 .readpage = ocfs2_readpage,
2458 .readahead = ocfs2_readahead,
2459 .writepage = ocfs2_writepage,
2460 .write_begin = ocfs2_write_begin,
2461 .write_end = ocfs2_write_end,
2462 .bmap = ocfs2_bmap,
2463 .direct_IO = ocfs2_direct_IO,
2464 .invalidatepage = block_invalidatepage,
2465 .releasepage = ocfs2_releasepage,
2466 .migratepage = buffer_migrate_page,
2467 .is_partially_uptodate = block_is_partially_uptodate,
2468 .error_remove_page = generic_error_remove_page,
2469};
2470