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6
7
8#include <linux/fs.h>
9#include <linux/slab.h>
10#include <linux/highmem.h>
11#include <linux/pagemap.h>
12#include <asm/byteorder.h>
13#include <linux/swap.h>
14#include <linux/pipe_fs_i.h>
15#include <linux/mpage.h>
16#include <linux/quotaops.h>
17#include <linux/blkdev.h>
18#include <linux/uio.h>
19#include <linux/mm.h>
20
21#include <cluster/masklog.h>
22
23#include "ocfs2.h"
24
25#include "alloc.h"
26#include "aops.h"
27#include "dlmglue.h"
28#include "extent_map.h"
29#include "file.h"
30#include "inode.h"
31#include "journal.h"
32#include "suballoc.h"
33#include "super.h"
34#include "symlink.h"
35#include "refcounttree.h"
36#include "ocfs2_trace.h"
37
38#include "buffer_head_io.h"
39#include "dir.h"
40#include "namei.h"
41#include "sysfile.h"
42
43static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
44 struct buffer_head *bh_result, int create)
45{
46 int err = -EIO;
47 int status;
48 struct ocfs2_dinode *fe = NULL;
49 struct buffer_head *bh = NULL;
50 struct buffer_head *buffer_cache_bh = NULL;
51 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
52 void *kaddr;
53
54 trace_ocfs2_symlink_get_block(
55 (unsigned long long)OCFS2_I(inode)->ip_blkno,
56 (unsigned long long)iblock, bh_result, create);
57
58 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
59
60 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
61 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
62 (unsigned long long)iblock);
63 goto bail;
64 }
65
66 status = ocfs2_read_inode_block(inode, &bh);
67 if (status < 0) {
68 mlog_errno(status);
69 goto bail;
70 }
71 fe = (struct ocfs2_dinode *) bh->b_data;
72
73 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
74 le32_to_cpu(fe->i_clusters))) {
75 err = -ENOMEM;
76 mlog(ML_ERROR, "block offset is outside the allocated size: "
77 "%llu\n", (unsigned long long)iblock);
78 goto bail;
79 }
80
81
82
83 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
84 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
85 iblock;
86 buffer_cache_bh = sb_getblk(osb->sb, blkno);
87 if (!buffer_cache_bh) {
88 err = -ENOMEM;
89 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
90 goto bail;
91 }
92
93
94
95
96
97 if (buffer_jbd(buffer_cache_bh)
98 && ocfs2_inode_is_new(inode)) {
99 kaddr = kmap_atomic(bh_result->b_page);
100 if (!kaddr) {
101 mlog(ML_ERROR, "couldn't kmap!\n");
102 goto bail;
103 }
104 memcpy(kaddr + (bh_result->b_size * iblock),
105 buffer_cache_bh->b_data,
106 bh_result->b_size);
107 kunmap_atomic(kaddr);
108 set_buffer_uptodate(bh_result);
109 }
110 brelse(buffer_cache_bh);
111 }
112
113 map_bh(bh_result, inode->i_sb,
114 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
115
116 err = 0;
117
118bail:
119 brelse(bh);
120
121 return err;
122}
123
124static int ocfs2_lock_get_block(struct inode *inode, sector_t iblock,
125 struct buffer_head *bh_result, int create)
126{
127 int ret = 0;
128 struct ocfs2_inode_info *oi = OCFS2_I(inode);
129
130 down_read(&oi->ip_alloc_sem);
131 ret = ocfs2_get_block(inode, iblock, bh_result, create);
132 up_read(&oi->ip_alloc_sem);
133
134 return ret;
135}
136
137int ocfs2_get_block(struct inode *inode, sector_t iblock,
138 struct buffer_head *bh_result, int create)
139{
140 int err = 0;
141 unsigned int ext_flags;
142 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
143 u64 p_blkno, count, past_eof;
144 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
145
146 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
147 (unsigned long long)iblock, bh_result, create);
148
149 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
150 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
151 inode, inode->i_ino);
152
153 if (S_ISLNK(inode->i_mode)) {
154
155 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
156 goto bail;
157 }
158
159 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
160 &ext_flags);
161 if (err) {
162 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
163 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
164 (unsigned long long)p_blkno);
165 goto bail;
166 }
167
168 if (max_blocks < count)
169 count = max_blocks;
170
171
172
173
174
175
176
177
178
179
180
181
182 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
183 clear_buffer_dirty(bh_result);
184 clear_buffer_uptodate(bh_result);
185 goto bail;
186 }
187
188
189 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
190 map_bh(bh_result, inode->i_sb, p_blkno);
191
192 bh_result->b_size = count << inode->i_blkbits;
193
194 if (!ocfs2_sparse_alloc(osb)) {
195 if (p_blkno == 0) {
196 err = -EIO;
197 mlog(ML_ERROR,
198 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
199 (unsigned long long)iblock,
200 (unsigned long long)p_blkno,
201 (unsigned long long)OCFS2_I(inode)->ip_blkno);
202 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
203 dump_stack();
204 goto bail;
205 }
206 }
207
208 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
209
210 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
211 (unsigned long long)past_eof);
212 if (create && (iblock >= past_eof))
213 set_buffer_new(bh_result);
214
215bail:
216 if (err < 0)
217 err = -EIO;
218
219 return err;
220}
221
222int ocfs2_read_inline_data(struct inode *inode, struct page *page,
223 struct buffer_head *di_bh)
224{
225 void *kaddr;
226 loff_t size;
227 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
228
229 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
230 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n",
231 (unsigned long long)OCFS2_I(inode)->ip_blkno);
232 return -EROFS;
233 }
234
235 size = i_size_read(inode);
236
237 if (size > PAGE_SIZE ||
238 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
239 ocfs2_error(inode->i_sb,
240 "Inode %llu has with inline data has bad size: %Lu\n",
241 (unsigned long long)OCFS2_I(inode)->ip_blkno,
242 (unsigned long long)size);
243 return -EROFS;
244 }
245
246 kaddr = kmap_atomic(page);
247 if (size)
248 memcpy(kaddr, di->id2.i_data.id_data, size);
249
250 memset(kaddr + size, 0, PAGE_SIZE - size);
251 flush_dcache_page(page);
252 kunmap_atomic(kaddr);
253
254 SetPageUptodate(page);
255
256 return 0;
257}
258
259static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
260{
261 int ret;
262 struct buffer_head *di_bh = NULL;
263
264 BUG_ON(!PageLocked(page));
265 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
266
267 ret = ocfs2_read_inode_block(inode, &di_bh);
268 if (ret) {
269 mlog_errno(ret);
270 goto out;
271 }
272
273 ret = ocfs2_read_inline_data(inode, page, di_bh);
274out:
275 unlock_page(page);
276
277 brelse(di_bh);
278 return ret;
279}
280
281static int ocfs2_readpage(struct file *file, struct page *page)
282{
283 struct inode *inode = page->mapping->host;
284 struct ocfs2_inode_info *oi = OCFS2_I(inode);
285 loff_t start = (loff_t)page->index << PAGE_SHIFT;
286 int ret, unlock = 1;
287
288 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
289 (page ? page->index : 0));
290
291 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
292 if (ret != 0) {
293 if (ret == AOP_TRUNCATED_PAGE)
294 unlock = 0;
295 mlog_errno(ret);
296 goto out;
297 }
298
299 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
300
301
302
303
304 ret = AOP_TRUNCATED_PAGE;
305 unlock_page(page);
306 unlock = 0;
307 down_read(&oi->ip_alloc_sem);
308 up_read(&oi->ip_alloc_sem);
309 goto out_inode_unlock;
310 }
311
312
313
314
315
316
317
318
319
320
321
322 if (start >= i_size_read(inode)) {
323 zero_user(page, 0, PAGE_SIZE);
324 SetPageUptodate(page);
325 ret = 0;
326 goto out_alloc;
327 }
328
329 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
330 ret = ocfs2_readpage_inline(inode, page);
331 else
332 ret = block_read_full_page(page, ocfs2_get_block);
333 unlock = 0;
334
335out_alloc:
336 up_read(&oi->ip_alloc_sem);
337out_inode_unlock:
338 ocfs2_inode_unlock(inode, 0);
339out:
340 if (unlock)
341 unlock_page(page);
342 return ret;
343}
344
345
346
347
348
349
350
351
352
353
354static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
355 struct list_head *pages, unsigned nr_pages)
356{
357 int ret, err = -EIO;
358 struct inode *inode = mapping->host;
359 struct ocfs2_inode_info *oi = OCFS2_I(inode);
360 loff_t start;
361 struct page *last;
362
363
364
365
366
367 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
368 if (ret)
369 return err;
370
371 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
372 ocfs2_inode_unlock(inode, 0);
373 return err;
374 }
375
376
377
378
379
380 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
381 goto out_unlock;
382
383
384
385
386
387 last = lru_to_page(pages);
388 start = (loff_t)last->index << PAGE_SHIFT;
389 if (start >= i_size_read(inode))
390 goto out_unlock;
391
392 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
393
394out_unlock:
395 up_read(&oi->ip_alloc_sem);
396 ocfs2_inode_unlock(inode, 0);
397
398 return err;
399}
400
401
402
403
404
405
406
407
408
409
410
411
412static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
413{
414 trace_ocfs2_writepage(
415 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
416 page->index);
417
418 return block_write_full_page(page, ocfs2_get_block, wbc);
419}
420
421
422
423
424
425int walk_page_buffers( handle_t *handle,
426 struct buffer_head *head,
427 unsigned from,
428 unsigned to,
429 int *partial,
430 int (*fn)( handle_t *handle,
431 struct buffer_head *bh))
432{
433 struct buffer_head *bh;
434 unsigned block_start, block_end;
435 unsigned blocksize = head->b_size;
436 int err, ret = 0;
437 struct buffer_head *next;
438
439 for ( bh = head, block_start = 0;
440 ret == 0 && (bh != head || !block_start);
441 block_start = block_end, bh = next)
442 {
443 next = bh->b_this_page;
444 block_end = block_start + blocksize;
445 if (block_end <= from || block_start >= to) {
446 if (partial && !buffer_uptodate(bh))
447 *partial = 1;
448 continue;
449 }
450 err = (*fn)(handle, bh);
451 if (!ret)
452 ret = err;
453 }
454 return ret;
455}
456
457static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
458{
459 sector_t status;
460 u64 p_blkno = 0;
461 int err = 0;
462 struct inode *inode = mapping->host;
463
464 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
465 (unsigned long long)block);
466
467
468
469
470
471
472
473 if (ocfs2_is_refcount_inode(inode))
474 return 0;
475
476
477
478
479 if (!INODE_JOURNAL(inode)) {
480 err = ocfs2_inode_lock(inode, NULL, 0);
481 if (err) {
482 if (err != -ENOENT)
483 mlog_errno(err);
484 goto bail;
485 }
486 down_read(&OCFS2_I(inode)->ip_alloc_sem);
487 }
488
489 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
490 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
491 NULL);
492
493 if (!INODE_JOURNAL(inode)) {
494 up_read(&OCFS2_I(inode)->ip_alloc_sem);
495 ocfs2_inode_unlock(inode, 0);
496 }
497
498 if (err) {
499 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
500 (unsigned long long)block);
501 mlog_errno(err);
502 goto bail;
503 }
504
505bail:
506 status = err ? 0 : p_blkno;
507
508 return status;
509}
510
511static int ocfs2_releasepage(struct page *page, gfp_t wait)
512{
513 if (!page_has_buffers(page))
514 return 0;
515 return try_to_free_buffers(page);
516}
517
518static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
519 u32 cpos,
520 unsigned int *start,
521 unsigned int *end)
522{
523 unsigned int cluster_start = 0, cluster_end = PAGE_SIZE;
524
525 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) {
526 unsigned int cpp;
527
528 cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits);
529
530 cluster_start = cpos % cpp;
531 cluster_start = cluster_start << osb->s_clustersize_bits;
532
533 cluster_end = cluster_start + osb->s_clustersize;
534 }
535
536 BUG_ON(cluster_start > PAGE_SIZE);
537 BUG_ON(cluster_end > PAGE_SIZE);
538
539 if (start)
540 *start = cluster_start;
541 if (end)
542 *end = cluster_end;
543}
544
545
546
547
548
549
550
551
552
553static void ocfs2_clear_page_regions(struct page *page,
554 struct ocfs2_super *osb, u32 cpos,
555 unsigned from, unsigned to)
556{
557 void *kaddr;
558 unsigned int cluster_start, cluster_end;
559
560 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
561
562 kaddr = kmap_atomic(page);
563
564 if (from || to) {
565 if (from > cluster_start)
566 memset(kaddr + cluster_start, 0, from - cluster_start);
567 if (to < cluster_end)
568 memset(kaddr + to, 0, cluster_end - to);
569 } else {
570 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
571 }
572
573 kunmap_atomic(kaddr);
574}
575
576
577
578
579
580
581
582
583static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
584 unsigned int block_start)
585{
586 u64 offset = page_offset(page) + block_start;
587
588 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
589 return 1;
590
591 if (i_size_read(inode) > offset)
592 return 1;
593
594 return 0;
595}
596
597
598
599
600
601
602
603
604int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
605 struct inode *inode, unsigned int from,
606 unsigned int to, int new)
607{
608 int ret = 0;
609 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
610 unsigned int block_end, block_start;
611 unsigned int bsize = i_blocksize(inode);
612
613 if (!page_has_buffers(page))
614 create_empty_buffers(page, bsize, 0);
615
616 head = page_buffers(page);
617 for (bh = head, block_start = 0; bh != head || !block_start;
618 bh = bh->b_this_page, block_start += bsize) {
619 block_end = block_start + bsize;
620
621 clear_buffer_new(bh);
622
623
624
625
626
627 if (block_start >= to || block_end <= from) {
628 if (PageUptodate(page))
629 set_buffer_uptodate(bh);
630 continue;
631 }
632
633
634
635
636
637 if (new)
638 set_buffer_new(bh);
639
640 if (!buffer_mapped(bh)) {
641 map_bh(bh, inode->i_sb, *p_blkno);
642 clean_bdev_bh_alias(bh);
643 }
644
645 if (PageUptodate(page)) {
646 if (!buffer_uptodate(bh))
647 set_buffer_uptodate(bh);
648 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
649 !buffer_new(bh) &&
650 ocfs2_should_read_blk(inode, page, block_start) &&
651 (block_start < from || block_end > to)) {
652 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
653 *wait_bh++=bh;
654 }
655
656 *p_blkno = *p_blkno + 1;
657 }
658
659
660
661
662 while(wait_bh > wait) {
663 wait_on_buffer(*--wait_bh);
664 if (!buffer_uptodate(*wait_bh))
665 ret = -EIO;
666 }
667
668 if (ret == 0 || !new)
669 return ret;
670
671
672
673
674
675 bh = head;
676 block_start = 0;
677 do {
678 block_end = block_start + bsize;
679 if (block_end <= from)
680 goto next_bh;
681 if (block_start >= to)
682 break;
683
684 zero_user(page, block_start, bh->b_size);
685 set_buffer_uptodate(bh);
686 mark_buffer_dirty(bh);
687
688next_bh:
689 block_start = block_end;
690 bh = bh->b_this_page;
691 } while (bh != head);
692
693 return ret;
694}
695
696#if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
697#define OCFS2_MAX_CTXT_PAGES 1
698#else
699#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE)
700#endif
701
702#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE)
703
704struct ocfs2_unwritten_extent {
705 struct list_head ue_node;
706 struct list_head ue_ip_node;
707 u32 ue_cpos;
708 u32 ue_phys;
709};
710
711
712
713
714struct ocfs2_write_cluster_desc {
715 u32 c_cpos;
716 u32 c_phys;
717
718
719
720
721 unsigned c_new;
722 unsigned c_clear_unwritten;
723 unsigned c_needs_zero;
724};
725
726struct ocfs2_write_ctxt {
727
728 u32 w_cpos;
729 u32 w_clen;
730
731
732 u32 w_first_new_cpos;
733
734
735 ocfs2_write_type_t w_type;
736
737 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
738
739
740
741
742
743
744
745 unsigned int w_large_pages;
746
747
748
749
750
751
752
753
754
755
756
757
758
759 unsigned int w_num_pages;
760 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
761 struct page *w_target_page;
762
763
764
765
766
767 unsigned int w_target_locked:1;
768
769
770
771
772
773 unsigned int w_target_from;
774 unsigned int w_target_to;
775
776
777
778
779
780 handle_t *w_handle;
781
782 struct buffer_head *w_di_bh;
783
784 struct ocfs2_cached_dealloc_ctxt w_dealloc;
785
786 struct list_head w_unwritten_list;
787 unsigned int w_unwritten_count;
788};
789
790void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
791{
792 int i;
793
794 for(i = 0; i < num_pages; i++) {
795 if (pages[i]) {
796 unlock_page(pages[i]);
797 mark_page_accessed(pages[i]);
798 put_page(pages[i]);
799 }
800 }
801}
802
803static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc)
804{
805 int i;
806
807
808
809
810
811
812 if (wc->w_target_locked) {
813 BUG_ON(!wc->w_target_page);
814 for (i = 0; i < wc->w_num_pages; i++) {
815 if (wc->w_target_page == wc->w_pages[i]) {
816 wc->w_pages[i] = NULL;
817 break;
818 }
819 }
820 mark_page_accessed(wc->w_target_page);
821 put_page(wc->w_target_page);
822 }
823 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
824}
825
826static void ocfs2_free_unwritten_list(struct inode *inode,
827 struct list_head *head)
828{
829 struct ocfs2_inode_info *oi = OCFS2_I(inode);
830 struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL;
831
832 list_for_each_entry_safe(ue, tmp, head, ue_node) {
833 list_del(&ue->ue_node);
834 spin_lock(&oi->ip_lock);
835 list_del(&ue->ue_ip_node);
836 spin_unlock(&oi->ip_lock);
837 kfree(ue);
838 }
839}
840
841static void ocfs2_free_write_ctxt(struct inode *inode,
842 struct ocfs2_write_ctxt *wc)
843{
844 ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list);
845 ocfs2_unlock_pages(wc);
846 brelse(wc->w_di_bh);
847 kfree(wc);
848}
849
850static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
851 struct ocfs2_super *osb, loff_t pos,
852 unsigned len, ocfs2_write_type_t type,
853 struct buffer_head *di_bh)
854{
855 u32 cend;
856 struct ocfs2_write_ctxt *wc;
857
858 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
859 if (!wc)
860 return -ENOMEM;
861
862 wc->w_cpos = pos >> osb->s_clustersize_bits;
863 wc->w_first_new_cpos = UINT_MAX;
864 cend = (pos + len - 1) >> osb->s_clustersize_bits;
865 wc->w_clen = cend - wc->w_cpos + 1;
866 get_bh(di_bh);
867 wc->w_di_bh = di_bh;
868 wc->w_type = type;
869
870 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits))
871 wc->w_large_pages = 1;
872 else
873 wc->w_large_pages = 0;
874
875 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
876 INIT_LIST_HEAD(&wc->w_unwritten_list);
877
878 *wcp = wc;
879
880 return 0;
881}
882
883
884
885
886
887
888static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
889{
890 unsigned int block_start, block_end;
891 struct buffer_head *head, *bh;
892
893 BUG_ON(!PageLocked(page));
894 if (!page_has_buffers(page))
895 return;
896
897 bh = head = page_buffers(page);
898 block_start = 0;
899 do {
900 block_end = block_start + bh->b_size;
901
902 if (buffer_new(bh)) {
903 if (block_end > from && block_start < to) {
904 if (!PageUptodate(page)) {
905 unsigned start, end;
906
907 start = max(from, block_start);
908 end = min(to, block_end);
909
910 zero_user_segment(page, start, end);
911 set_buffer_uptodate(bh);
912 }
913
914 clear_buffer_new(bh);
915 mark_buffer_dirty(bh);
916 }
917 }
918
919 block_start = block_end;
920 bh = bh->b_this_page;
921 } while (bh != head);
922}
923
924
925
926
927
928static void ocfs2_write_failure(struct inode *inode,
929 struct ocfs2_write_ctxt *wc,
930 loff_t user_pos, unsigned user_len)
931{
932 int i;
933 unsigned from = user_pos & (PAGE_SIZE - 1),
934 to = user_pos + user_len;
935 struct page *tmppage;
936
937 if (wc->w_target_page)
938 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
939
940 for(i = 0; i < wc->w_num_pages; i++) {
941 tmppage = wc->w_pages[i];
942
943 if (tmppage && page_has_buffers(tmppage)) {
944 if (ocfs2_should_order_data(inode))
945 ocfs2_jbd2_file_inode(wc->w_handle, inode);
946
947 block_commit_write(tmppage, from, to);
948 }
949 }
950}
951
952static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
953 struct ocfs2_write_ctxt *wc,
954 struct page *page, u32 cpos,
955 loff_t user_pos, unsigned user_len,
956 int new)
957{
958 int ret;
959 unsigned int map_from = 0, map_to = 0;
960 unsigned int cluster_start, cluster_end;
961 unsigned int user_data_from = 0, user_data_to = 0;
962
963 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
964 &cluster_start, &cluster_end);
965
966
967
968
969 new = new | ((i_size_read(inode) <= page_offset(page)) &&
970 (page_offset(page) <= user_pos));
971
972 if (page == wc->w_target_page) {
973 map_from = user_pos & (PAGE_SIZE - 1);
974 map_to = map_from + user_len;
975
976 if (new)
977 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
978 cluster_start, cluster_end,
979 new);
980 else
981 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
982 map_from, map_to, new);
983 if (ret) {
984 mlog_errno(ret);
985 goto out;
986 }
987
988 user_data_from = map_from;
989 user_data_to = map_to;
990 if (new) {
991 map_from = cluster_start;
992 map_to = cluster_end;
993 }
994 } else {
995
996
997
998
999
1000 BUG_ON(!new);
1001
1002 map_from = cluster_start;
1003 map_to = cluster_end;
1004
1005 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1006 cluster_start, cluster_end, new);
1007 if (ret) {
1008 mlog_errno(ret);
1009 goto out;
1010 }
1011 }
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023 if (new && !PageUptodate(page))
1024 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1025 cpos, user_data_from, user_data_to);
1026
1027 flush_dcache_page(page);
1028
1029out:
1030 return ret;
1031}
1032
1033
1034
1035
1036static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1037 struct ocfs2_write_ctxt *wc,
1038 u32 cpos, loff_t user_pos,
1039 unsigned user_len, int new,
1040 struct page *mmap_page)
1041{
1042 int ret = 0, i;
1043 unsigned long start, target_index, end_index, index;
1044 struct inode *inode = mapping->host;
1045 loff_t last_byte;
1046
1047 target_index = user_pos >> PAGE_SHIFT;
1048
1049
1050
1051
1052
1053
1054
1055
1056 if (new) {
1057 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1058 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1059
1060
1061
1062
1063
1064 last_byte = max(user_pos + user_len, i_size_read(inode));
1065 BUG_ON(last_byte < 1);
1066 end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1;
1067 if ((start + wc->w_num_pages) > end_index)
1068 wc->w_num_pages = end_index - start;
1069 } else {
1070 wc->w_num_pages = 1;
1071 start = target_index;
1072 }
1073 end_index = (user_pos + user_len - 1) >> PAGE_SHIFT;
1074
1075 for(i = 0; i < wc->w_num_pages; i++) {
1076 index = start + i;
1077
1078 if (index >= target_index && index <= end_index &&
1079 wc->w_type == OCFS2_WRITE_MMAP) {
1080
1081
1082
1083
1084
1085 lock_page(mmap_page);
1086
1087
1088 if (mmap_page->mapping != mapping) {
1089 WARN_ON(mmap_page->mapping);
1090 unlock_page(mmap_page);
1091 ret = -EAGAIN;
1092 goto out;
1093 }
1094
1095 get_page(mmap_page);
1096 wc->w_pages[i] = mmap_page;
1097 wc->w_target_locked = true;
1098 } else if (index >= target_index && index <= end_index &&
1099 wc->w_type == OCFS2_WRITE_DIRECT) {
1100
1101 wc->w_pages[i] = NULL;
1102 continue;
1103 } else {
1104 wc->w_pages[i] = find_or_create_page(mapping, index,
1105 GFP_NOFS);
1106 if (!wc->w_pages[i]) {
1107 ret = -ENOMEM;
1108 mlog_errno(ret);
1109 goto out;
1110 }
1111 }
1112 wait_for_stable_page(wc->w_pages[i]);
1113
1114 if (index == target_index)
1115 wc->w_target_page = wc->w_pages[i];
1116 }
1117out:
1118 if (ret)
1119 wc->w_target_locked = false;
1120 return ret;
1121}
1122
1123
1124
1125
1126static int ocfs2_write_cluster(struct address_space *mapping,
1127 u32 *phys, unsigned int new,
1128 unsigned int clear_unwritten,
1129 unsigned int should_zero,
1130 struct ocfs2_alloc_context *data_ac,
1131 struct ocfs2_alloc_context *meta_ac,
1132 struct ocfs2_write_ctxt *wc, u32 cpos,
1133 loff_t user_pos, unsigned user_len)
1134{
1135 int ret, i;
1136 u64 p_blkno;
1137 struct inode *inode = mapping->host;
1138 struct ocfs2_extent_tree et;
1139 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1140
1141 if (new) {
1142 u32 tmp_pos;
1143
1144
1145
1146
1147
1148 tmp_pos = cpos;
1149 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1150 &tmp_pos, 1, !clear_unwritten,
1151 wc->w_di_bh, wc->w_handle,
1152 data_ac, meta_ac, NULL);
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162 mlog_bug_on_msg(ret == -EAGAIN,
1163 "Inode %llu: EAGAIN return during allocation.\n",
1164 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1165 if (ret < 0) {
1166 mlog_errno(ret);
1167 goto out;
1168 }
1169 } else if (clear_unwritten) {
1170 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1171 wc->w_di_bh);
1172 ret = ocfs2_mark_extent_written(inode, &et,
1173 wc->w_handle, cpos, 1, *phys,
1174 meta_ac, &wc->w_dealloc);
1175 if (ret < 0) {
1176 mlog_errno(ret);
1177 goto out;
1178 }
1179 }
1180
1181
1182
1183
1184
1185 ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL);
1186 if (ret < 0) {
1187 mlog(ML_ERROR, "Get physical blkno failed for inode %llu, "
1188 "at logical cluster %u",
1189 (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
1190 goto out;
1191 }
1192
1193 BUG_ON(*phys == 0);
1194
1195 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys);
1196 if (!should_zero)
1197 p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1);
1198
1199 for(i = 0; i < wc->w_num_pages; i++) {
1200 int tmpret;
1201
1202
1203 if (wc->w_pages[i] == NULL) {
1204 p_blkno++;
1205 continue;
1206 }
1207
1208 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1209 wc->w_pages[i], cpos,
1210 user_pos, user_len,
1211 should_zero);
1212 if (tmpret) {
1213 mlog_errno(tmpret);
1214 if (ret == 0)
1215 ret = tmpret;
1216 }
1217 }
1218
1219
1220
1221
1222 if (ret && new)
1223 ocfs2_write_failure(inode, wc, user_pos, user_len);
1224
1225out:
1226
1227 return ret;
1228}
1229
1230static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1231 struct ocfs2_alloc_context *data_ac,
1232 struct ocfs2_alloc_context *meta_ac,
1233 struct ocfs2_write_ctxt *wc,
1234 loff_t pos, unsigned len)
1235{
1236 int ret, i;
1237 loff_t cluster_off;
1238 unsigned int local_len = len;
1239 struct ocfs2_write_cluster_desc *desc;
1240 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1241
1242 for (i = 0; i < wc->w_clen; i++) {
1243 desc = &wc->w_desc[i];
1244
1245
1246
1247
1248
1249 local_len = len;
1250 cluster_off = pos & (osb->s_clustersize - 1);
1251 if ((cluster_off + local_len) > osb->s_clustersize)
1252 local_len = osb->s_clustersize - cluster_off;
1253
1254 ret = ocfs2_write_cluster(mapping, &desc->c_phys,
1255 desc->c_new,
1256 desc->c_clear_unwritten,
1257 desc->c_needs_zero,
1258 data_ac, meta_ac,
1259 wc, desc->c_cpos, pos, local_len);
1260 if (ret) {
1261 mlog_errno(ret);
1262 goto out;
1263 }
1264
1265 len -= local_len;
1266 pos += local_len;
1267 }
1268
1269 ret = 0;
1270out:
1271 return ret;
1272}
1273
1274
1275
1276
1277
1278
1279static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1280 struct ocfs2_write_ctxt *wc,
1281 loff_t pos, unsigned len, int alloc)
1282{
1283 struct ocfs2_write_cluster_desc *desc;
1284
1285 wc->w_target_from = pos & (PAGE_SIZE - 1);
1286 wc->w_target_to = wc->w_target_from + len;
1287
1288 if (alloc == 0)
1289 return;
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300 if (wc->w_large_pages) {
1301
1302
1303
1304
1305
1306
1307 desc = &wc->w_desc[0];
1308 if (desc->c_needs_zero)
1309 ocfs2_figure_cluster_boundaries(osb,
1310 desc->c_cpos,
1311 &wc->w_target_from,
1312 NULL);
1313
1314 desc = &wc->w_desc[wc->w_clen - 1];
1315 if (desc->c_needs_zero)
1316 ocfs2_figure_cluster_boundaries(osb,
1317 desc->c_cpos,
1318 NULL,
1319 &wc->w_target_to);
1320 } else {
1321 wc->w_target_from = 0;
1322 wc->w_target_to = PAGE_SIZE;
1323 }
1324}
1325
1326
1327
1328
1329
1330
1331
1332
1333static int ocfs2_unwritten_check(struct inode *inode,
1334 struct ocfs2_write_ctxt *wc,
1335 struct ocfs2_write_cluster_desc *desc)
1336{
1337 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1338 struct ocfs2_unwritten_extent *ue = NULL, *new = NULL;
1339 int ret = 0;
1340
1341 if (!desc->c_needs_zero)
1342 return 0;
1343
1344retry:
1345 spin_lock(&oi->ip_lock);
1346
1347
1348
1349 list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) {
1350 if (desc->c_cpos == ue->ue_cpos) {
1351 BUG_ON(desc->c_new);
1352 desc->c_needs_zero = 0;
1353 desc->c_clear_unwritten = 0;
1354 goto unlock;
1355 }
1356 }
1357
1358 if (wc->w_type != OCFS2_WRITE_DIRECT)
1359 goto unlock;
1360
1361 if (new == NULL) {
1362 spin_unlock(&oi->ip_lock);
1363 new = kmalloc(sizeof(struct ocfs2_unwritten_extent),
1364 GFP_NOFS);
1365 if (new == NULL) {
1366 ret = -ENOMEM;
1367 goto out;
1368 }
1369 goto retry;
1370 }
1371
1372 new->ue_cpos = desc->c_cpos;
1373 new->ue_phys = desc->c_phys;
1374 desc->c_clear_unwritten = 0;
1375 list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list);
1376 list_add_tail(&new->ue_node, &wc->w_unwritten_list);
1377 wc->w_unwritten_count++;
1378 new = NULL;
1379unlock:
1380 spin_unlock(&oi->ip_lock);
1381out:
1382 kfree(new);
1383 return ret;
1384}
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394static int ocfs2_populate_write_desc(struct inode *inode,
1395 struct ocfs2_write_ctxt *wc,
1396 unsigned int *clusters_to_alloc,
1397 unsigned int *extents_to_split)
1398{
1399 int ret;
1400 struct ocfs2_write_cluster_desc *desc;
1401 unsigned int num_clusters = 0;
1402 unsigned int ext_flags = 0;
1403 u32 phys = 0;
1404 int i;
1405
1406 *clusters_to_alloc = 0;
1407 *extents_to_split = 0;
1408
1409 for (i = 0; i < wc->w_clen; i++) {
1410 desc = &wc->w_desc[i];
1411 desc->c_cpos = wc->w_cpos + i;
1412
1413 if (num_clusters == 0) {
1414
1415
1416
1417 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1418 &num_clusters, &ext_flags);
1419 if (ret) {
1420 mlog_errno(ret);
1421 goto out;
1422 }
1423
1424
1425 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1437 *extents_to_split = *extents_to_split + 2;
1438 } else if (phys) {
1439
1440
1441
1442
1443 phys++;
1444 }
1445
1446
1447
1448
1449
1450
1451
1452 if (desc->c_cpos >= wc->w_first_new_cpos) {
1453 BUG_ON(phys == 0);
1454 desc->c_needs_zero = 1;
1455 }
1456
1457 desc->c_phys = phys;
1458 if (phys == 0) {
1459 desc->c_new = 1;
1460 desc->c_needs_zero = 1;
1461 desc->c_clear_unwritten = 1;
1462 *clusters_to_alloc = *clusters_to_alloc + 1;
1463 }
1464
1465 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
1466 desc->c_clear_unwritten = 1;
1467 desc->c_needs_zero = 1;
1468 }
1469
1470 ret = ocfs2_unwritten_check(inode, wc, desc);
1471 if (ret) {
1472 mlog_errno(ret);
1473 goto out;
1474 }
1475
1476 num_clusters--;
1477 }
1478
1479 ret = 0;
1480out:
1481 return ret;
1482}
1483
1484static int ocfs2_write_begin_inline(struct address_space *mapping,
1485 struct inode *inode,
1486 struct ocfs2_write_ctxt *wc)
1487{
1488 int ret;
1489 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1490 struct page *page;
1491 handle_t *handle;
1492 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1493
1494 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1495 if (IS_ERR(handle)) {
1496 ret = PTR_ERR(handle);
1497 mlog_errno(ret);
1498 goto out;
1499 }
1500
1501 page = find_or_create_page(mapping, 0, GFP_NOFS);
1502 if (!page) {
1503 ocfs2_commit_trans(osb, handle);
1504 ret = -ENOMEM;
1505 mlog_errno(ret);
1506 goto out;
1507 }
1508
1509
1510
1511
1512 wc->w_pages[0] = wc->w_target_page = page;
1513 wc->w_num_pages = 1;
1514
1515 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1516 OCFS2_JOURNAL_ACCESS_WRITE);
1517 if (ret) {
1518 ocfs2_commit_trans(osb, handle);
1519
1520 mlog_errno(ret);
1521 goto out;
1522 }
1523
1524 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1525 ocfs2_set_inode_data_inline(inode, di);
1526
1527 if (!PageUptodate(page)) {
1528 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1529 if (ret) {
1530 ocfs2_commit_trans(osb, handle);
1531
1532 goto out;
1533 }
1534 }
1535
1536 wc->w_handle = handle;
1537out:
1538 return ret;
1539}
1540
1541int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1542{
1543 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1544
1545 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1546 return 1;
1547 return 0;
1548}
1549
1550static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1551 struct inode *inode, loff_t pos,
1552 unsigned len, struct page *mmap_page,
1553 struct ocfs2_write_ctxt *wc)
1554{
1555 int ret, written = 0;
1556 loff_t end = pos + len;
1557 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1558 struct ocfs2_dinode *di = NULL;
1559
1560 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1561 len, (unsigned long long)pos,
1562 oi->ip_dyn_features);
1563
1564
1565
1566
1567 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1568 if (mmap_page == NULL &&
1569 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1570 goto do_inline_write;
1571
1572
1573
1574
1575
1576 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1577 if (ret)
1578 mlog_errno(ret);
1579 goto out;
1580 }
1581
1582
1583
1584
1585 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1586 return 0;
1587
1588
1589
1590
1591 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1592 if (mmap_page ||
1593 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
1594 return 0;
1595
1596do_inline_write:
1597 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1598 if (ret) {
1599 mlog_errno(ret);
1600 goto out;
1601 }
1602
1603
1604
1605
1606
1607 written = 1;
1608out:
1609 return written ? written : ret;
1610}
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1622 struct buffer_head *di_bh,
1623 loff_t pos, unsigned len,
1624 struct ocfs2_write_ctxt *wc)
1625{
1626 int ret;
1627 loff_t newsize = pos + len;
1628
1629 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1630
1631 if (newsize <= i_size_read(inode))
1632 return 0;
1633
1634 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
1635 if (ret)
1636 mlog_errno(ret);
1637
1638
1639 if (wc)
1640 wc->w_first_new_cpos =
1641 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1642
1643 return ret;
1644}
1645
1646static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1647 loff_t pos)
1648{
1649 int ret = 0;
1650
1651 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1652 if (pos > i_size_read(inode))
1653 ret = ocfs2_zero_extend(inode, di_bh, pos);
1654
1655 return ret;
1656}
1657
1658int ocfs2_write_begin_nolock(struct address_space *mapping,
1659 loff_t pos, unsigned len, ocfs2_write_type_t type,
1660 struct page **pagep, void **fsdata,
1661 struct buffer_head *di_bh, struct page *mmap_page)
1662{
1663 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
1664 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
1665 struct ocfs2_write_ctxt *wc;
1666 struct inode *inode = mapping->host;
1667 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1668 struct ocfs2_dinode *di;
1669 struct ocfs2_alloc_context *data_ac = NULL;
1670 struct ocfs2_alloc_context *meta_ac = NULL;
1671 handle_t *handle;
1672 struct ocfs2_extent_tree et;
1673 int try_free = 1, ret1;
1674
1675try_again:
1676 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh);
1677 if (ret) {
1678 mlog_errno(ret);
1679 return ret;
1680 }
1681
1682 if (ocfs2_supports_inline_data(osb)) {
1683 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1684 mmap_page, wc);
1685 if (ret == 1) {
1686 ret = 0;
1687 goto success;
1688 }
1689 if (ret < 0) {
1690 mlog_errno(ret);
1691 goto out;
1692 }
1693 }
1694
1695
1696 if (type != OCFS2_WRITE_DIRECT) {
1697 if (ocfs2_sparse_alloc(osb))
1698 ret = ocfs2_zero_tail(inode, di_bh, pos);
1699 else
1700 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
1701 len, wc);
1702 if (ret) {
1703 mlog_errno(ret);
1704 goto out;
1705 }
1706 }
1707
1708 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1709 if (ret < 0) {
1710 mlog_errno(ret);
1711 goto out;
1712 } else if (ret == 1) {
1713 clusters_need = wc->w_clen;
1714 ret = ocfs2_refcount_cow(inode, di_bh,
1715 wc->w_cpos, wc->w_clen, UINT_MAX);
1716 if (ret) {
1717 mlog_errno(ret);
1718 goto out;
1719 }
1720 }
1721
1722 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1723 &extents_to_split);
1724 if (ret) {
1725 mlog_errno(ret);
1726 goto out;
1727 }
1728 clusters_need += clusters_to_alloc;
1729
1730 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1731
1732 trace_ocfs2_write_begin_nolock(
1733 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1734 (long long)i_size_read(inode),
1735 le32_to_cpu(di->i_clusters),
1736 pos, len, type, mmap_page,
1737 clusters_to_alloc, extents_to_split);
1738
1739
1740
1741
1742
1743
1744
1745 if (clusters_to_alloc || extents_to_split) {
1746
1747
1748
1749
1750
1751 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1752 wc->w_di_bh);
1753 ret = ocfs2_lock_allocators(inode, &et,
1754 clusters_to_alloc, extents_to_split,
1755 &data_ac, &meta_ac);
1756 if (ret) {
1757 mlog_errno(ret);
1758 goto out;
1759 }
1760
1761 if (data_ac)
1762 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1763
1764 credits = ocfs2_calc_extend_credits(inode->i_sb,
1765 &di->id2.i_list);
1766 } else if (type == OCFS2_WRITE_DIRECT)
1767
1768 goto success;
1769
1770
1771
1772
1773
1774
1775 if (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1776 wc->w_desc[wc->w_clen - 1].c_needs_zero))
1777 cluster_of_pages = 1;
1778 else
1779 cluster_of_pages = 0;
1780
1781 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
1782
1783 handle = ocfs2_start_trans(osb, credits);
1784 if (IS_ERR(handle)) {
1785 ret = PTR_ERR(handle);
1786 mlog_errno(ret);
1787 goto out;
1788 }
1789
1790 wc->w_handle = handle;
1791
1792 if (clusters_to_alloc) {
1793 ret = dquot_alloc_space_nodirty(inode,
1794 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1795 if (ret)
1796 goto out_commit;
1797 }
1798
1799 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1800 OCFS2_JOURNAL_ACCESS_WRITE);
1801 if (ret) {
1802 mlog_errno(ret);
1803 goto out_quota;
1804 }
1805
1806
1807
1808
1809
1810
1811 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
1812 cluster_of_pages, mmap_page);
1813 if (ret && ret != -EAGAIN) {
1814 mlog_errno(ret);
1815 goto out_quota;
1816 }
1817
1818
1819
1820
1821
1822
1823
1824 if (ret == -EAGAIN) {
1825 BUG_ON(wc->w_target_page);
1826 ret = 0;
1827 goto out_quota;
1828 }
1829
1830 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1831 len);
1832 if (ret) {
1833 mlog_errno(ret);
1834 goto out_quota;
1835 }
1836
1837 if (data_ac)
1838 ocfs2_free_alloc_context(data_ac);
1839 if (meta_ac)
1840 ocfs2_free_alloc_context(meta_ac);
1841
1842success:
1843 if (pagep)
1844 *pagep = wc->w_target_page;
1845 *fsdata = wc;
1846 return 0;
1847out_quota:
1848 if (clusters_to_alloc)
1849 dquot_free_space(inode,
1850 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1851out_commit:
1852 ocfs2_commit_trans(osb, handle);
1853
1854out:
1855
1856
1857
1858
1859
1860
1861
1862 if (wc->w_target_locked)
1863 unlock_page(mmap_page);
1864
1865 ocfs2_free_write_ctxt(inode, wc);
1866
1867 if (data_ac) {
1868 ocfs2_free_alloc_context(data_ac);
1869 data_ac = NULL;
1870 }
1871 if (meta_ac) {
1872 ocfs2_free_alloc_context(meta_ac);
1873 meta_ac = NULL;
1874 }
1875
1876 if (ret == -ENOSPC && try_free) {
1877
1878
1879
1880
1881 try_free = 0;
1882
1883 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1884 if (ret1 == 1)
1885 goto try_again;
1886
1887 if (ret1 < 0)
1888 mlog_errno(ret1);
1889 }
1890
1891 return ret;
1892}
1893
1894static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1895 loff_t pos, unsigned len, unsigned flags,
1896 struct page **pagep, void **fsdata)
1897{
1898 int ret;
1899 struct buffer_head *di_bh = NULL;
1900 struct inode *inode = mapping->host;
1901
1902 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1903 if (ret) {
1904 mlog_errno(ret);
1905 return ret;
1906 }
1907
1908
1909
1910
1911
1912
1913
1914
1915 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1916
1917 ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER,
1918 pagep, fsdata, di_bh, NULL);
1919 if (ret) {
1920 mlog_errno(ret);
1921 goto out_fail;
1922 }
1923
1924 brelse(di_bh);
1925
1926 return 0;
1927
1928out_fail:
1929 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1930
1931 brelse(di_bh);
1932 ocfs2_inode_unlock(inode, 1);
1933
1934 return ret;
1935}
1936
1937static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1938 unsigned len, unsigned *copied,
1939 struct ocfs2_dinode *di,
1940 struct ocfs2_write_ctxt *wc)
1941{
1942 void *kaddr;
1943
1944 if (unlikely(*copied < len)) {
1945 if (!PageUptodate(wc->w_target_page)) {
1946 *copied = 0;
1947 return;
1948 }
1949 }
1950
1951 kaddr = kmap_atomic(wc->w_target_page);
1952 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1953 kunmap_atomic(kaddr);
1954
1955 trace_ocfs2_write_end_inline(
1956 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1957 (unsigned long long)pos, *copied,
1958 le16_to_cpu(di->id2.i_data.id_count),
1959 le16_to_cpu(di->i_dyn_features));
1960}
1961
1962int ocfs2_write_end_nolock(struct address_space *mapping,
1963 loff_t pos, unsigned len, unsigned copied, void *fsdata)
1964{
1965 int i, ret;
1966 unsigned from, to, start = pos & (PAGE_SIZE - 1);
1967 struct inode *inode = mapping->host;
1968 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1969 struct ocfs2_write_ctxt *wc = fsdata;
1970 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1971 handle_t *handle = wc->w_handle;
1972 struct page *tmppage;
1973
1974 BUG_ON(!list_empty(&wc->w_unwritten_list));
1975
1976 if (handle) {
1977 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
1978 wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1979 if (ret) {
1980 copied = ret;
1981 mlog_errno(ret);
1982 goto out;
1983 }
1984 }
1985
1986 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1987 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1988 goto out_write_size;
1989 }
1990
1991 if (unlikely(copied < len) && wc->w_target_page) {
1992 if (!PageUptodate(wc->w_target_page))
1993 copied = 0;
1994
1995 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1996 start+len);
1997 }
1998 if (wc->w_target_page)
1999 flush_dcache_page(wc->w_target_page);
2000
2001 for(i = 0; i < wc->w_num_pages; i++) {
2002 tmppage = wc->w_pages[i];
2003
2004
2005 if (tmppage == NULL)
2006 continue;
2007
2008 if (tmppage == wc->w_target_page) {
2009 from = wc->w_target_from;
2010 to = wc->w_target_to;
2011
2012 BUG_ON(from > PAGE_SIZE ||
2013 to > PAGE_SIZE ||
2014 to < from);
2015 } else {
2016
2017
2018
2019
2020
2021 from = 0;
2022 to = PAGE_SIZE;
2023 }
2024
2025 if (page_has_buffers(tmppage)) {
2026 if (handle && ocfs2_should_order_data(inode))
2027 ocfs2_jbd2_file_inode(handle, inode);
2028 block_commit_write(tmppage, from, to);
2029 }
2030 }
2031
2032out_write_size:
2033
2034 if (wc->w_type != OCFS2_WRITE_DIRECT) {
2035 pos += copied;
2036 if (pos > i_size_read(inode)) {
2037 i_size_write(inode, pos);
2038 mark_inode_dirty(inode);
2039 }
2040 inode->i_blocks = ocfs2_inode_sector_count(inode);
2041 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2042 inode->i_mtime = inode->i_ctime = current_time(inode);
2043 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2044 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
2045 ocfs2_update_inode_fsync_trans(handle, inode, 1);
2046 }
2047 if (handle)
2048 ocfs2_journal_dirty(handle, wc->w_di_bh);
2049
2050out:
2051
2052
2053
2054
2055
2056 ocfs2_unlock_pages(wc);
2057
2058 if (handle)
2059 ocfs2_commit_trans(osb, handle);
2060
2061 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2062
2063 brelse(wc->w_di_bh);
2064 kfree(wc);
2065
2066 return copied;
2067}
2068
2069static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2070 loff_t pos, unsigned len, unsigned copied,
2071 struct page *page, void *fsdata)
2072{
2073 int ret;
2074 struct inode *inode = mapping->host;
2075
2076 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, fsdata);
2077
2078 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2079 ocfs2_inode_unlock(inode, 1);
2080
2081 return ret;
2082}
2083
2084struct ocfs2_dio_write_ctxt {
2085 struct list_head dw_zero_list;
2086 unsigned dw_zero_count;
2087 int dw_orphaned;
2088 pid_t dw_writer_pid;
2089};
2090
2091static struct ocfs2_dio_write_ctxt *
2092ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc)
2093{
2094 struct ocfs2_dio_write_ctxt *dwc = NULL;
2095
2096 if (bh->b_private)
2097 return bh->b_private;
2098
2099 dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS);
2100 if (dwc == NULL)
2101 return NULL;
2102 INIT_LIST_HEAD(&dwc->dw_zero_list);
2103 dwc->dw_zero_count = 0;
2104 dwc->dw_orphaned = 0;
2105 dwc->dw_writer_pid = task_pid_nr(current);
2106 bh->b_private = dwc;
2107 *alloc = 1;
2108
2109 return dwc;
2110}
2111
2112static void ocfs2_dio_free_write_ctx(struct inode *inode,
2113 struct ocfs2_dio_write_ctxt *dwc)
2114{
2115 ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list);
2116 kfree(dwc);
2117}
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132static int ocfs2_dio_wr_get_block(struct inode *inode, sector_t iblock,
2133 struct buffer_head *bh_result, int create)
2134{
2135 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2136 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2137 struct ocfs2_write_ctxt *wc;
2138 struct ocfs2_write_cluster_desc *desc = NULL;
2139 struct ocfs2_dio_write_ctxt *dwc = NULL;
2140 struct buffer_head *di_bh = NULL;
2141 u64 p_blkno;
2142 loff_t pos = iblock << inode->i_sb->s_blocksize_bits;
2143 unsigned len, total_len = bh_result->b_size;
2144 int ret = 0, first_get_block = 0;
2145
2146 len = osb->s_clustersize - (pos & (osb->s_clustersize - 1));
2147 len = min(total_len, len);
2148
2149 mlog(0, "get block of %lu at %llu:%u req %u\n",
2150 inode->i_ino, pos, len, total_len);
2151
2152
2153
2154
2155
2156
2157 if (pos + total_len <= i_size_read(inode)) {
2158
2159
2160 ret = ocfs2_lock_get_block(inode, iblock, bh_result, create);
2161 if (buffer_mapped(bh_result) &&
2162 !buffer_new(bh_result) &&
2163 ret == 0)
2164 goto out;
2165
2166
2167 bh_result->b_state = 0;
2168 }
2169
2170 dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block);
2171 if (unlikely(dwc == NULL)) {
2172 ret = -ENOMEM;
2173 mlog_errno(ret);
2174 goto out;
2175 }
2176
2177 if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) >
2178 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) &&
2179 !dwc->dw_orphaned) {
2180
2181
2182
2183
2184
2185 ret = ocfs2_add_inode_to_orphan(osb, inode);
2186 if (ret < 0) {
2187 mlog_errno(ret);
2188 goto out;
2189 }
2190 dwc->dw_orphaned = 1;
2191 }
2192
2193 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2194 if (ret) {
2195 mlog_errno(ret);
2196 goto out;
2197 }
2198
2199 down_write(&oi->ip_alloc_sem);
2200
2201 if (first_get_block) {
2202 if (ocfs2_sparse_alloc(osb))
2203 ret = ocfs2_zero_tail(inode, di_bh, pos);
2204 else
2205 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
2206 total_len, NULL);
2207 if (ret < 0) {
2208 mlog_errno(ret);
2209 goto unlock;
2210 }
2211 }
2212
2213 ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len,
2214 OCFS2_WRITE_DIRECT, NULL,
2215 (void **)&wc, di_bh, NULL);
2216 if (ret) {
2217 mlog_errno(ret);
2218 goto unlock;
2219 }
2220
2221 desc = &wc->w_desc[0];
2222
2223 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys);
2224 BUG_ON(p_blkno == 0);
2225 p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1);
2226
2227 map_bh(bh_result, inode->i_sb, p_blkno);
2228 bh_result->b_size = len;
2229 if (desc->c_needs_zero)
2230 set_buffer_new(bh_result);
2231
2232
2233
2234 set_buffer_defer_completion(bh_result);
2235
2236 if (!list_empty(&wc->w_unwritten_list)) {
2237 struct ocfs2_unwritten_extent *ue = NULL;
2238
2239 ue = list_first_entry(&wc->w_unwritten_list,
2240 struct ocfs2_unwritten_extent,
2241 ue_node);
2242 BUG_ON(ue->ue_cpos != desc->c_cpos);
2243
2244 ue->ue_phys = desc->c_phys;
2245
2246 list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list);
2247 dwc->dw_zero_count += wc->w_unwritten_count;
2248 }
2249
2250 ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc);
2251 BUG_ON(ret != len);
2252 ret = 0;
2253unlock:
2254 up_write(&oi->ip_alloc_sem);
2255 ocfs2_inode_unlock(inode, 1);
2256 brelse(di_bh);
2257out:
2258 if (ret < 0)
2259 ret = -EIO;
2260 return ret;
2261}
2262
2263static int ocfs2_dio_end_io_write(struct inode *inode,
2264 struct ocfs2_dio_write_ctxt *dwc,
2265 loff_t offset,
2266 ssize_t bytes)
2267{
2268 struct ocfs2_cached_dealloc_ctxt dealloc;
2269 struct ocfs2_extent_tree et;
2270 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2271 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2272 struct ocfs2_unwritten_extent *ue = NULL;
2273 struct buffer_head *di_bh = NULL;
2274 struct ocfs2_dinode *di;
2275 struct ocfs2_alloc_context *data_ac = NULL;
2276 struct ocfs2_alloc_context *meta_ac = NULL;
2277 handle_t *handle = NULL;
2278 loff_t end = offset + bytes;
2279 int ret = 0, credits = 0, locked = 0;
2280
2281 ocfs2_init_dealloc_ctxt(&dealloc);
2282
2283
2284
2285 if (list_empty(&dwc->dw_zero_list) &&
2286 end <= i_size_read(inode) &&
2287 !dwc->dw_orphaned)
2288 goto out;
2289
2290
2291
2292 if (dwc->dw_writer_pid != task_pid_nr(current)) {
2293 inode_lock(inode);
2294 locked = 1;
2295 }
2296
2297 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2298 if (ret < 0) {
2299 mlog_errno(ret);
2300 goto out;
2301 }
2302
2303 down_write(&oi->ip_alloc_sem);
2304
2305
2306 if (dwc->dw_orphaned) {
2307 BUG_ON(dwc->dw_writer_pid != task_pid_nr(current));
2308
2309 end = end > i_size_read(inode) ? end : 0;
2310
2311 ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh,
2312 !!end, end);
2313 if (ret < 0)
2314 mlog_errno(ret);
2315 }
2316
2317 di = (struct ocfs2_dinode *)di_bh->b_data;
2318
2319 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
2320
2321
2322
2323
2324
2325 et.et_dealloc = &dealloc;
2326
2327 ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
2328 &data_ac, &meta_ac);
2329 if (ret) {
2330 mlog_errno(ret);
2331 goto unlock;
2332 }
2333
2334 credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list);
2335
2336 handle = ocfs2_start_trans(osb, credits);
2337 if (IS_ERR(handle)) {
2338 ret = PTR_ERR(handle);
2339 mlog_errno(ret);
2340 goto unlock;
2341 }
2342 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2343 OCFS2_JOURNAL_ACCESS_WRITE);
2344 if (ret) {
2345 mlog_errno(ret);
2346 goto commit;
2347 }
2348
2349 list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) {
2350 ret = ocfs2_mark_extent_written(inode, &et, handle,
2351 ue->ue_cpos, 1,
2352 ue->ue_phys,
2353 meta_ac, &dealloc);
2354 if (ret < 0) {
2355 mlog_errno(ret);
2356 break;
2357 }
2358 }
2359
2360 if (end > i_size_read(inode)) {
2361 ret = ocfs2_set_inode_size(handle, inode, di_bh, end);
2362 if (ret < 0)
2363 mlog_errno(ret);
2364 }
2365commit:
2366 ocfs2_commit_trans(osb, handle);
2367unlock:
2368 up_write(&oi->ip_alloc_sem);
2369 ocfs2_inode_unlock(inode, 1);
2370 brelse(di_bh);
2371out:
2372 if (data_ac)
2373 ocfs2_free_alloc_context(data_ac);
2374 if (meta_ac)
2375 ocfs2_free_alloc_context(meta_ac);
2376 ocfs2_run_deallocs(osb, &dealloc);
2377 if (locked)
2378 inode_unlock(inode);
2379 ocfs2_dio_free_write_ctx(inode, dwc);
2380
2381 return ret;
2382}
2383
2384
2385
2386
2387
2388
2389static int ocfs2_dio_end_io(struct kiocb *iocb,
2390 loff_t offset,
2391 ssize_t bytes,
2392 void *private)
2393{
2394 struct inode *inode = file_inode(iocb->ki_filp);
2395 int level;
2396 int ret = 0;
2397
2398
2399 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
2400
2401 if (bytes <= 0)
2402 mlog_ratelimited(ML_ERROR, "Direct IO failed, bytes = %lld",
2403 (long long)bytes);
2404 if (private) {
2405 if (bytes > 0)
2406 ret = ocfs2_dio_end_io_write(inode, private, offset,
2407 bytes);
2408 else
2409 ocfs2_dio_free_write_ctx(inode, private);
2410 }
2411
2412 ocfs2_iocb_clear_rw_locked(iocb);
2413
2414 level = ocfs2_iocb_rw_locked_level(iocb);
2415 ocfs2_rw_unlock(inode, level);
2416 return ret;
2417}
2418
2419static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2420{
2421 struct file *file = iocb->ki_filp;
2422 struct inode *inode = file->f_mapping->host;
2423 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2424 get_block_t *get_block;
2425
2426
2427
2428
2429
2430 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2431 return 0;
2432
2433
2434 if (iocb->ki_pos + iter->count > i_size_read(inode) &&
2435 !ocfs2_supports_append_dio(osb))
2436 return 0;
2437
2438 if (iov_iter_rw(iter) == READ)
2439 get_block = ocfs2_lock_get_block;
2440 else
2441 get_block = ocfs2_dio_wr_get_block;
2442
2443 return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
2444 iter, get_block,
2445 ocfs2_dio_end_io, NULL, 0);
2446}
2447
2448const struct address_space_operations ocfs2_aops = {
2449 .readpage = ocfs2_readpage,
2450 .readpages = ocfs2_readpages,
2451 .writepage = ocfs2_writepage,
2452 .write_begin = ocfs2_write_begin,
2453 .write_end = ocfs2_write_end,
2454 .bmap = ocfs2_bmap,
2455 .direct_IO = ocfs2_direct_IO,
2456 .invalidatepage = block_invalidatepage,
2457 .releasepage = ocfs2_releasepage,
2458 .migratepage = buffer_migrate_page,
2459 .is_partially_uptodate = block_is_partially_uptodate,
2460 .error_remove_page = generic_error_remove_page,
2461};
2462