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22#include <linux/fs.h>
23#include <linux/slab.h>
24#include <linux/highmem.h>
25#include <linux/pagemap.h>
26#include <asm/byteorder.h>
27#include <linux/swap.h>
28#include <linux/pipe_fs_i.h>
29#include <linux/mpage.h>
30#include <linux/quotaops.h>
31
32#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
37#include "aops.h"
38#include "dlmglue.h"
39#include "extent_map.h"
40#include "file.h"
41#include "inode.h"
42#include "journal.h"
43#include "suballoc.h"
44#include "super.h"
45#include "symlink.h"
46#include "refcounttree.h"
47#include "ocfs2_trace.h"
48
49#include "buffer_head_io.h"
50
51static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
52 struct buffer_head *bh_result, int create)
53{
54 int err = -EIO;
55 int status;
56 struct ocfs2_dinode *fe = NULL;
57 struct buffer_head *bh = NULL;
58 struct buffer_head *buffer_cache_bh = NULL;
59 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
60 void *kaddr;
61
62 trace_ocfs2_symlink_get_block(
63 (unsigned long long)OCFS2_I(inode)->ip_blkno,
64 (unsigned long long)iblock, bh_result, create);
65
66 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
67
68 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
69 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
70 (unsigned long long)iblock);
71 goto bail;
72 }
73
74 status = ocfs2_read_inode_block(inode, &bh);
75 if (status < 0) {
76 mlog_errno(status);
77 goto bail;
78 }
79 fe = (struct ocfs2_dinode *) bh->b_data;
80
81 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
82 le32_to_cpu(fe->i_clusters))) {
83 mlog(ML_ERROR, "block offset is outside the allocated size: "
84 "%llu\n", (unsigned long long)iblock);
85 goto bail;
86 }
87
88
89
90 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
91 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
92 iblock;
93 buffer_cache_bh = sb_getblk(osb->sb, blkno);
94 if (!buffer_cache_bh) {
95 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
96 goto bail;
97 }
98
99
100
101
102
103 if (buffer_jbd(buffer_cache_bh)
104 && ocfs2_inode_is_new(inode)) {
105 kaddr = kmap_atomic(bh_result->b_page, KM_USER0);
106 if (!kaddr) {
107 mlog(ML_ERROR, "couldn't kmap!\n");
108 goto bail;
109 }
110 memcpy(kaddr + (bh_result->b_size * iblock),
111 buffer_cache_bh->b_data,
112 bh_result->b_size);
113 kunmap_atomic(kaddr, KM_USER0);
114 set_buffer_uptodate(bh_result);
115 }
116 brelse(buffer_cache_bh);
117 }
118
119 map_bh(bh_result, inode->i_sb,
120 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
121
122 err = 0;
123
124bail:
125 brelse(bh);
126
127 return err;
128}
129
130int ocfs2_get_block(struct inode *inode, sector_t iblock,
131 struct buffer_head *bh_result, int create)
132{
133 int err = 0;
134 unsigned int ext_flags;
135 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
136 u64 p_blkno, count, past_eof;
137 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
138
139 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
140 (unsigned long long)iblock, bh_result, create);
141
142 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
143 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
144 inode, inode->i_ino);
145
146 if (S_ISLNK(inode->i_mode)) {
147
148 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
149 goto bail;
150 }
151
152 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
153 &ext_flags);
154 if (err) {
155 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
156 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
157 (unsigned long long)p_blkno);
158 goto bail;
159 }
160
161 if (max_blocks < count)
162 count = max_blocks;
163
164
165
166
167
168
169
170
171
172
173
174
175 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
176 clear_buffer_dirty(bh_result);
177 clear_buffer_uptodate(bh_result);
178 goto bail;
179 }
180
181
182 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
183 map_bh(bh_result, inode->i_sb, p_blkno);
184
185 bh_result->b_size = count << inode->i_blkbits;
186
187 if (!ocfs2_sparse_alloc(osb)) {
188 if (p_blkno == 0) {
189 err = -EIO;
190 mlog(ML_ERROR,
191 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
192 (unsigned long long)iblock,
193 (unsigned long long)p_blkno,
194 (unsigned long long)OCFS2_I(inode)->ip_blkno);
195 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
196 dump_stack();
197 goto bail;
198 }
199 }
200
201 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
202
203 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
204 (unsigned long long)past_eof);
205 if (create && (iblock >= past_eof))
206 set_buffer_new(bh_result);
207
208bail:
209 if (err < 0)
210 err = -EIO;
211
212 return err;
213}
214
215int ocfs2_read_inline_data(struct inode *inode, struct page *page,
216 struct buffer_head *di_bh)
217{
218 void *kaddr;
219 loff_t size;
220 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
221
222 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
223 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
224 (unsigned long long)OCFS2_I(inode)->ip_blkno);
225 return -EROFS;
226 }
227
228 size = i_size_read(inode);
229
230 if (size > PAGE_CACHE_SIZE ||
231 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
232 ocfs2_error(inode->i_sb,
233 "Inode %llu has with inline data has bad size: %Lu",
234 (unsigned long long)OCFS2_I(inode)->ip_blkno,
235 (unsigned long long)size);
236 return -EROFS;
237 }
238
239 kaddr = kmap_atomic(page, KM_USER0);
240 if (size)
241 memcpy(kaddr, di->id2.i_data.id_data, size);
242
243 memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
244 flush_dcache_page(page);
245 kunmap_atomic(kaddr, KM_USER0);
246
247 SetPageUptodate(page);
248
249 return 0;
250}
251
252static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
253{
254 int ret;
255 struct buffer_head *di_bh = NULL;
256
257 BUG_ON(!PageLocked(page));
258 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
259
260 ret = ocfs2_read_inode_block(inode, &di_bh);
261 if (ret) {
262 mlog_errno(ret);
263 goto out;
264 }
265
266 ret = ocfs2_read_inline_data(inode, page, di_bh);
267out:
268 unlock_page(page);
269
270 brelse(di_bh);
271 return ret;
272}
273
274static int ocfs2_readpage(struct file *file, struct page *page)
275{
276 struct inode *inode = page->mapping->host;
277 struct ocfs2_inode_info *oi = OCFS2_I(inode);
278 loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT;
279 int ret, unlock = 1;
280
281 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
282 (page ? page->index : 0));
283
284 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
285 if (ret != 0) {
286 if (ret == AOP_TRUNCATED_PAGE)
287 unlock = 0;
288 mlog_errno(ret);
289 goto out;
290 }
291
292 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
293
294
295
296
297 ret = AOP_TRUNCATED_PAGE;
298 unlock_page(page);
299 unlock = 0;
300 down_read(&oi->ip_alloc_sem);
301 up_read(&oi->ip_alloc_sem);
302 goto out_inode_unlock;
303 }
304
305
306
307
308
309
310
311
312
313
314
315 if (start >= i_size_read(inode)) {
316 zero_user(page, 0, PAGE_SIZE);
317 SetPageUptodate(page);
318 ret = 0;
319 goto out_alloc;
320 }
321
322 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
323 ret = ocfs2_readpage_inline(inode, page);
324 else
325 ret = block_read_full_page(page, ocfs2_get_block);
326 unlock = 0;
327
328out_alloc:
329 up_read(&OCFS2_I(inode)->ip_alloc_sem);
330out_inode_unlock:
331 ocfs2_inode_unlock(inode, 0);
332out:
333 if (unlock)
334 unlock_page(page);
335 return ret;
336}
337
338
339
340
341
342
343
344
345
346
347static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
348 struct list_head *pages, unsigned nr_pages)
349{
350 int ret, err = -EIO;
351 struct inode *inode = mapping->host;
352 struct ocfs2_inode_info *oi = OCFS2_I(inode);
353 loff_t start;
354 struct page *last;
355
356
357
358
359
360 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
361 if (ret)
362 return err;
363
364 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
365 ocfs2_inode_unlock(inode, 0);
366 return err;
367 }
368
369
370
371
372
373 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
374 goto out_unlock;
375
376
377
378
379
380 last = list_entry(pages->prev, struct page, lru);
381 start = (loff_t)last->index << PAGE_CACHE_SHIFT;
382 if (start >= i_size_read(inode))
383 goto out_unlock;
384
385 err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block);
386
387out_unlock:
388 up_read(&oi->ip_alloc_sem);
389 ocfs2_inode_unlock(inode, 0);
390
391 return err;
392}
393
394
395
396
397
398
399
400
401
402
403
404
405static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
406{
407 trace_ocfs2_writepage(
408 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
409 page->index);
410
411 return block_write_full_page(page, ocfs2_get_block, wbc);
412}
413
414
415
416
417
418int walk_page_buffers( handle_t *handle,
419 struct buffer_head *head,
420 unsigned from,
421 unsigned to,
422 int *partial,
423 int (*fn)( handle_t *handle,
424 struct buffer_head *bh))
425{
426 struct buffer_head *bh;
427 unsigned block_start, block_end;
428 unsigned blocksize = head->b_size;
429 int err, ret = 0;
430 struct buffer_head *next;
431
432 for ( bh = head, block_start = 0;
433 ret == 0 && (bh != head || !block_start);
434 block_start = block_end, bh = next)
435 {
436 next = bh->b_this_page;
437 block_end = block_start + blocksize;
438 if (block_end <= from || block_start >= to) {
439 if (partial && !buffer_uptodate(bh))
440 *partial = 1;
441 continue;
442 }
443 err = (*fn)(handle, bh);
444 if (!ret)
445 ret = err;
446 }
447 return ret;
448}
449
450static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
451{
452 sector_t status;
453 u64 p_blkno = 0;
454 int err = 0;
455 struct inode *inode = mapping->host;
456
457 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
458 (unsigned long long)block);
459
460
461
462
463 if (!INODE_JOURNAL(inode)) {
464 err = ocfs2_inode_lock(inode, NULL, 0);
465 if (err) {
466 if (err != -ENOENT)
467 mlog_errno(err);
468 goto bail;
469 }
470 down_read(&OCFS2_I(inode)->ip_alloc_sem);
471 }
472
473 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
474 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
475 NULL);
476
477 if (!INODE_JOURNAL(inode)) {
478 up_read(&OCFS2_I(inode)->ip_alloc_sem);
479 ocfs2_inode_unlock(inode, 0);
480 }
481
482 if (err) {
483 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
484 (unsigned long long)block);
485 mlog_errno(err);
486 goto bail;
487 }
488
489bail:
490 status = err ? 0 : p_blkno;
491
492 return status;
493}
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
512 struct buffer_head *bh_result, int create)
513{
514 int ret;
515 u64 p_blkno, inode_blocks, contig_blocks;
516 unsigned int ext_flags;
517 unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
518 unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
519
520
521
522
523
524 inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
525
526
527
528 ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
529 &contig_blocks, &ext_flags);
530 if (ret) {
531 mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
532 (unsigned long long)iblock);
533 ret = -EIO;
534 goto bail;
535 }
536
537
538 BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
539
540
541
542
543
544
545
546 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
547 map_bh(bh_result, inode->i_sb, p_blkno);
548 else
549 clear_buffer_mapped(bh_result);
550
551
552
553 if (max_blocks < contig_blocks)
554 contig_blocks = max_blocks;
555 bh_result->b_size = contig_blocks << blocksize_bits;
556bail:
557 return ret;
558}
559
560
561
562
563
564
565static void ocfs2_dio_end_io(struct kiocb *iocb,
566 loff_t offset,
567 ssize_t bytes,
568 void *private,
569 int ret,
570 bool is_async)
571{
572 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
573 int level;
574 wait_queue_head_t *wq = ocfs2_ioend_wq(inode);
575
576
577 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
578
579 if (ocfs2_iocb_is_sem_locked(iocb))
580 ocfs2_iocb_clear_sem_locked(iocb);
581
582 if (ocfs2_iocb_is_unaligned_aio(iocb)) {
583 ocfs2_iocb_clear_unaligned_aio(iocb);
584
585 if (atomic_dec_and_test(&OCFS2_I(inode)->ip_unaligned_aio) &&
586 waitqueue_active(wq)) {
587 wake_up_all(wq);
588 }
589 }
590
591 ocfs2_iocb_clear_rw_locked(iocb);
592
593 level = ocfs2_iocb_rw_locked_level(iocb);
594 ocfs2_rw_unlock(inode, level);
595
596 if (is_async)
597 aio_complete(iocb, ret, 0);
598 inode_dio_done(inode);
599}
600
601
602
603
604
605
606static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
607{
608 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
609
610 jbd2_journal_invalidatepage(journal, page, offset);
611}
612
613static int ocfs2_releasepage(struct page *page, gfp_t wait)
614{
615 journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
616
617 if (!page_has_buffers(page))
618 return 0;
619 return jbd2_journal_try_to_free_buffers(journal, page, wait);
620}
621
622static ssize_t ocfs2_direct_IO(int rw,
623 struct kiocb *iocb,
624 const struct iovec *iov,
625 loff_t offset,
626 unsigned long nr_segs)
627{
628 struct file *file = iocb->ki_filp;
629 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
630
631
632
633
634
635 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
636 return 0;
637
638
639 if (i_size_read(inode) <= offset)
640 return 0;
641
642 return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev,
643 iov, offset, nr_segs,
644 ocfs2_direct_IO_get_blocks,
645 ocfs2_dio_end_io, NULL, 0);
646}
647
648static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
649 u32 cpos,
650 unsigned int *start,
651 unsigned int *end)
652{
653 unsigned int cluster_start = 0, cluster_end = PAGE_CACHE_SIZE;
654
655 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) {
656 unsigned int cpp;
657
658 cpp = 1 << (PAGE_CACHE_SHIFT - osb->s_clustersize_bits);
659
660 cluster_start = cpos % cpp;
661 cluster_start = cluster_start << osb->s_clustersize_bits;
662
663 cluster_end = cluster_start + osb->s_clustersize;
664 }
665
666 BUG_ON(cluster_start > PAGE_SIZE);
667 BUG_ON(cluster_end > PAGE_SIZE);
668
669 if (start)
670 *start = cluster_start;
671 if (end)
672 *end = cluster_end;
673}
674
675
676
677
678
679
680
681
682
683static void ocfs2_clear_page_regions(struct page *page,
684 struct ocfs2_super *osb, u32 cpos,
685 unsigned from, unsigned to)
686{
687 void *kaddr;
688 unsigned int cluster_start, cluster_end;
689
690 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
691
692 kaddr = kmap_atomic(page, KM_USER0);
693
694 if (from || to) {
695 if (from > cluster_start)
696 memset(kaddr + cluster_start, 0, from - cluster_start);
697 if (to < cluster_end)
698 memset(kaddr + to, 0, cluster_end - to);
699 } else {
700 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
701 }
702
703 kunmap_atomic(kaddr, KM_USER0);
704}
705
706
707
708
709
710
711
712
713static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
714 unsigned int block_start)
715{
716 u64 offset = page_offset(page) + block_start;
717
718 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
719 return 1;
720
721 if (i_size_read(inode) > offset)
722 return 1;
723
724 return 0;
725}
726
727
728
729
730
731
732
733
734int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
735 struct inode *inode, unsigned int from,
736 unsigned int to, int new)
737{
738 int ret = 0;
739 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
740 unsigned int block_end, block_start;
741 unsigned int bsize = 1 << inode->i_blkbits;
742
743 if (!page_has_buffers(page))
744 create_empty_buffers(page, bsize, 0);
745
746 head = page_buffers(page);
747 for (bh = head, block_start = 0; bh != head || !block_start;
748 bh = bh->b_this_page, block_start += bsize) {
749 block_end = block_start + bsize;
750
751 clear_buffer_new(bh);
752
753
754
755
756
757 if (block_start >= to || block_end <= from) {
758 if (PageUptodate(page))
759 set_buffer_uptodate(bh);
760 continue;
761 }
762
763
764
765
766
767 if (new)
768 set_buffer_new(bh);
769
770 if (!buffer_mapped(bh)) {
771 map_bh(bh, inode->i_sb, *p_blkno);
772 unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
773 }
774
775 if (PageUptodate(page)) {
776 if (!buffer_uptodate(bh))
777 set_buffer_uptodate(bh);
778 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
779 !buffer_new(bh) &&
780 ocfs2_should_read_blk(inode, page, block_start) &&
781 (block_start < from || block_end > to)) {
782 ll_rw_block(READ, 1, &bh);
783 *wait_bh++=bh;
784 }
785
786 *p_blkno = *p_blkno + 1;
787 }
788
789
790
791
792 while(wait_bh > wait) {
793 wait_on_buffer(*--wait_bh);
794 if (!buffer_uptodate(*wait_bh))
795 ret = -EIO;
796 }
797
798 if (ret == 0 || !new)
799 return ret;
800
801
802
803
804
805 bh = head;
806 block_start = 0;
807 do {
808 block_end = block_start + bsize;
809 if (block_end <= from)
810 goto next_bh;
811 if (block_start >= to)
812 break;
813
814 zero_user(page, block_start, bh->b_size);
815 set_buffer_uptodate(bh);
816 mark_buffer_dirty(bh);
817
818next_bh:
819 block_start = block_end;
820 bh = bh->b_this_page;
821 } while (bh != head);
822
823 return ret;
824}
825
826#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
827#define OCFS2_MAX_CTXT_PAGES 1
828#else
829#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE)
830#endif
831
832#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE)
833
834
835
836
837struct ocfs2_write_cluster_desc {
838 u32 c_cpos;
839 u32 c_phys;
840
841
842
843
844 unsigned c_new;
845 unsigned c_unwritten;
846 unsigned c_needs_zero;
847};
848
849struct ocfs2_write_ctxt {
850
851 u32 w_cpos;
852 u32 w_clen;
853
854
855 u32 w_first_new_cpos;
856
857 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
858
859
860
861
862
863
864
865 unsigned int w_large_pages;
866
867
868
869
870
871
872
873
874
875
876
877
878
879 unsigned int w_num_pages;
880 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
881 struct page *w_target_page;
882
883
884
885
886
887 unsigned int w_target_locked:1;
888
889
890
891
892
893 unsigned int w_target_from;
894 unsigned int w_target_to;
895
896
897
898
899
900 handle_t *w_handle;
901
902 struct buffer_head *w_di_bh;
903
904 struct ocfs2_cached_dealloc_ctxt w_dealloc;
905};
906
907void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
908{
909 int i;
910
911 for(i = 0; i < num_pages; i++) {
912 if (pages[i]) {
913 unlock_page(pages[i]);
914 mark_page_accessed(pages[i]);
915 page_cache_release(pages[i]);
916 }
917 }
918}
919
920static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc)
921{
922 int i;
923
924
925
926
927
928
929 if (wc->w_target_locked) {
930 BUG_ON(!wc->w_target_page);
931 for (i = 0; i < wc->w_num_pages; i++) {
932 if (wc->w_target_page == wc->w_pages[i]) {
933 wc->w_pages[i] = NULL;
934 break;
935 }
936 }
937 mark_page_accessed(wc->w_target_page);
938 page_cache_release(wc->w_target_page);
939 }
940 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
941
942 brelse(wc->w_di_bh);
943 kfree(wc);
944}
945
946static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
947 struct ocfs2_super *osb, loff_t pos,
948 unsigned len, struct buffer_head *di_bh)
949{
950 u32 cend;
951 struct ocfs2_write_ctxt *wc;
952
953 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
954 if (!wc)
955 return -ENOMEM;
956
957 wc->w_cpos = pos >> osb->s_clustersize_bits;
958 wc->w_first_new_cpos = UINT_MAX;
959 cend = (pos + len - 1) >> osb->s_clustersize_bits;
960 wc->w_clen = cend - wc->w_cpos + 1;
961 get_bh(di_bh);
962 wc->w_di_bh = di_bh;
963
964 if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits))
965 wc->w_large_pages = 1;
966 else
967 wc->w_large_pages = 0;
968
969 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
970
971 *wcp = wc;
972
973 return 0;
974}
975
976
977
978
979
980
981static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
982{
983 unsigned int block_start, block_end;
984 struct buffer_head *head, *bh;
985
986 BUG_ON(!PageLocked(page));
987 if (!page_has_buffers(page))
988 return;
989
990 bh = head = page_buffers(page);
991 block_start = 0;
992 do {
993 block_end = block_start + bh->b_size;
994
995 if (buffer_new(bh)) {
996 if (block_end > from && block_start < to) {
997 if (!PageUptodate(page)) {
998 unsigned start, end;
999
1000 start = max(from, block_start);
1001 end = min(to, block_end);
1002
1003 zero_user_segment(page, start, end);
1004 set_buffer_uptodate(bh);
1005 }
1006
1007 clear_buffer_new(bh);
1008 mark_buffer_dirty(bh);
1009 }
1010 }
1011
1012 block_start = block_end;
1013 bh = bh->b_this_page;
1014 } while (bh != head);
1015}
1016
1017
1018
1019
1020
1021static void ocfs2_write_failure(struct inode *inode,
1022 struct ocfs2_write_ctxt *wc,
1023 loff_t user_pos, unsigned user_len)
1024{
1025 int i;
1026 unsigned from = user_pos & (PAGE_CACHE_SIZE - 1),
1027 to = user_pos + user_len;
1028 struct page *tmppage;
1029
1030 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
1031
1032 for(i = 0; i < wc->w_num_pages; i++) {
1033 tmppage = wc->w_pages[i];
1034
1035 if (page_has_buffers(tmppage)) {
1036 if (ocfs2_should_order_data(inode))
1037 ocfs2_jbd2_file_inode(wc->w_handle, inode);
1038
1039 block_commit_write(tmppage, from, to);
1040 }
1041 }
1042}
1043
1044static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
1045 struct ocfs2_write_ctxt *wc,
1046 struct page *page, u32 cpos,
1047 loff_t user_pos, unsigned user_len,
1048 int new)
1049{
1050 int ret;
1051 unsigned int map_from = 0, map_to = 0;
1052 unsigned int cluster_start, cluster_end;
1053 unsigned int user_data_from = 0, user_data_to = 0;
1054
1055 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
1056 &cluster_start, &cluster_end);
1057
1058
1059
1060
1061 new = new | ((i_size_read(inode) <= page_offset(page)) &&
1062 (page_offset(page) <= user_pos));
1063
1064 if (page == wc->w_target_page) {
1065 map_from = user_pos & (PAGE_CACHE_SIZE - 1);
1066 map_to = map_from + user_len;
1067
1068 if (new)
1069 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1070 cluster_start, cluster_end,
1071 new);
1072 else
1073 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1074 map_from, map_to, new);
1075 if (ret) {
1076 mlog_errno(ret);
1077 goto out;
1078 }
1079
1080 user_data_from = map_from;
1081 user_data_to = map_to;
1082 if (new) {
1083 map_from = cluster_start;
1084 map_to = cluster_end;
1085 }
1086 } else {
1087
1088
1089
1090
1091
1092 BUG_ON(!new);
1093
1094 map_from = cluster_start;
1095 map_to = cluster_end;
1096
1097 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
1098 cluster_start, cluster_end, new);
1099 if (ret) {
1100 mlog_errno(ret);
1101 goto out;
1102 }
1103 }
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115 if (new && !PageUptodate(page))
1116 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1117 cpos, user_data_from, user_data_to);
1118
1119 flush_dcache_page(page);
1120
1121out:
1122 return ret;
1123}
1124
1125
1126
1127
1128static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1129 struct ocfs2_write_ctxt *wc,
1130 u32 cpos, loff_t user_pos,
1131 unsigned user_len, int new,
1132 struct page *mmap_page)
1133{
1134 int ret = 0, i;
1135 unsigned long start, target_index, end_index, index;
1136 struct inode *inode = mapping->host;
1137 loff_t last_byte;
1138
1139 target_index = user_pos >> PAGE_CACHE_SHIFT;
1140
1141
1142
1143
1144
1145
1146
1147
1148 if (new) {
1149 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1150 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1151
1152
1153
1154
1155
1156 last_byte = max(user_pos + user_len, i_size_read(inode));
1157 BUG_ON(last_byte < 1);
1158 end_index = ((last_byte - 1) >> PAGE_CACHE_SHIFT) + 1;
1159 if ((start + wc->w_num_pages) > end_index)
1160 wc->w_num_pages = end_index - start;
1161 } else {
1162 wc->w_num_pages = 1;
1163 start = target_index;
1164 }
1165
1166 for(i = 0; i < wc->w_num_pages; i++) {
1167 index = start + i;
1168
1169 if (index == target_index && mmap_page) {
1170
1171
1172
1173
1174
1175 lock_page(mmap_page);
1176
1177
1178 if (mmap_page->mapping != mapping) {
1179 WARN_ON(mmap_page->mapping);
1180 unlock_page(mmap_page);
1181 ret = -EAGAIN;
1182 goto out;
1183 }
1184
1185 page_cache_get(mmap_page);
1186 wc->w_pages[i] = mmap_page;
1187 wc->w_target_locked = true;
1188 } else {
1189 wc->w_pages[i] = find_or_create_page(mapping, index,
1190 GFP_NOFS);
1191 if (!wc->w_pages[i]) {
1192 ret = -ENOMEM;
1193 mlog_errno(ret);
1194 goto out;
1195 }
1196 }
1197
1198 if (index == target_index)
1199 wc->w_target_page = wc->w_pages[i];
1200 }
1201out:
1202 if (ret)
1203 wc->w_target_locked = false;
1204 return ret;
1205}
1206
1207
1208
1209
1210static int ocfs2_write_cluster(struct address_space *mapping,
1211 u32 phys, unsigned int unwritten,
1212 unsigned int should_zero,
1213 struct ocfs2_alloc_context *data_ac,
1214 struct ocfs2_alloc_context *meta_ac,
1215 struct ocfs2_write_ctxt *wc, u32 cpos,
1216 loff_t user_pos, unsigned user_len)
1217{
1218 int ret, i, new;
1219 u64 v_blkno, p_blkno;
1220 struct inode *inode = mapping->host;
1221 struct ocfs2_extent_tree et;
1222
1223 new = phys == 0 ? 1 : 0;
1224 if (new) {
1225 u32 tmp_pos;
1226
1227
1228
1229
1230
1231 tmp_pos = cpos;
1232 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1233 &tmp_pos, 1, 0, wc->w_di_bh,
1234 wc->w_handle, data_ac,
1235 meta_ac, NULL);
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245 mlog_bug_on_msg(ret == -EAGAIN,
1246 "Inode %llu: EAGAIN return during allocation.\n",
1247 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1248 if (ret < 0) {
1249 mlog_errno(ret);
1250 goto out;
1251 }
1252 } else if (unwritten) {
1253 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1254 wc->w_di_bh);
1255 ret = ocfs2_mark_extent_written(inode, &et,
1256 wc->w_handle, cpos, 1, phys,
1257 meta_ac, &wc->w_dealloc);
1258 if (ret < 0) {
1259 mlog_errno(ret);
1260 goto out;
1261 }
1262 }
1263
1264 if (should_zero)
1265 v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos);
1266 else
1267 v_blkno = user_pos >> inode->i_sb->s_blocksize_bits;
1268
1269
1270
1271
1272
1273 ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
1274 NULL);
1275 if (ret < 0) {
1276 ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, "
1277 "at logical block %llu",
1278 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1279 (unsigned long long)v_blkno);
1280 goto out;
1281 }
1282
1283 BUG_ON(p_blkno == 0);
1284
1285 for(i = 0; i < wc->w_num_pages; i++) {
1286 int tmpret;
1287
1288 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1289 wc->w_pages[i], cpos,
1290 user_pos, user_len,
1291 should_zero);
1292 if (tmpret) {
1293 mlog_errno(tmpret);
1294 if (ret == 0)
1295 ret = tmpret;
1296 }
1297 }
1298
1299
1300
1301
1302 if (ret && new)
1303 ocfs2_write_failure(inode, wc, user_pos, user_len);
1304
1305out:
1306
1307 return ret;
1308}
1309
1310static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1311 struct ocfs2_alloc_context *data_ac,
1312 struct ocfs2_alloc_context *meta_ac,
1313 struct ocfs2_write_ctxt *wc,
1314 loff_t pos, unsigned len)
1315{
1316 int ret, i;
1317 loff_t cluster_off;
1318 unsigned int local_len = len;
1319 struct ocfs2_write_cluster_desc *desc;
1320 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1321
1322 for (i = 0; i < wc->w_clen; i++) {
1323 desc = &wc->w_desc[i];
1324
1325
1326
1327
1328
1329 local_len = len;
1330 cluster_off = pos & (osb->s_clustersize - 1);
1331 if ((cluster_off + local_len) > osb->s_clustersize)
1332 local_len = osb->s_clustersize - cluster_off;
1333
1334 ret = ocfs2_write_cluster(mapping, desc->c_phys,
1335 desc->c_unwritten,
1336 desc->c_needs_zero,
1337 data_ac, meta_ac,
1338 wc, desc->c_cpos, pos, local_len);
1339 if (ret) {
1340 mlog_errno(ret);
1341 goto out;
1342 }
1343
1344 len -= local_len;
1345 pos += local_len;
1346 }
1347
1348 ret = 0;
1349out:
1350 return ret;
1351}
1352
1353
1354
1355
1356
1357
1358static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1359 struct ocfs2_write_ctxt *wc,
1360 loff_t pos, unsigned len, int alloc)
1361{
1362 struct ocfs2_write_cluster_desc *desc;
1363
1364 wc->w_target_from = pos & (PAGE_CACHE_SIZE - 1);
1365 wc->w_target_to = wc->w_target_from + len;
1366
1367 if (alloc == 0)
1368 return;
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379 if (wc->w_large_pages) {
1380
1381
1382
1383
1384
1385
1386 desc = &wc->w_desc[0];
1387 if (desc->c_needs_zero)
1388 ocfs2_figure_cluster_boundaries(osb,
1389 desc->c_cpos,
1390 &wc->w_target_from,
1391 NULL);
1392
1393 desc = &wc->w_desc[wc->w_clen - 1];
1394 if (desc->c_needs_zero)
1395 ocfs2_figure_cluster_boundaries(osb,
1396 desc->c_cpos,
1397 NULL,
1398 &wc->w_target_to);
1399 } else {
1400 wc->w_target_from = 0;
1401 wc->w_target_to = PAGE_CACHE_SIZE;
1402 }
1403}
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413static int ocfs2_populate_write_desc(struct inode *inode,
1414 struct ocfs2_write_ctxt *wc,
1415 unsigned int *clusters_to_alloc,
1416 unsigned int *extents_to_split)
1417{
1418 int ret;
1419 struct ocfs2_write_cluster_desc *desc;
1420 unsigned int num_clusters = 0;
1421 unsigned int ext_flags = 0;
1422 u32 phys = 0;
1423 int i;
1424
1425 *clusters_to_alloc = 0;
1426 *extents_to_split = 0;
1427
1428 for (i = 0; i < wc->w_clen; i++) {
1429 desc = &wc->w_desc[i];
1430 desc->c_cpos = wc->w_cpos + i;
1431
1432 if (num_clusters == 0) {
1433
1434
1435
1436 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1437 &num_clusters, &ext_flags);
1438 if (ret) {
1439 mlog_errno(ret);
1440 goto out;
1441 }
1442
1443
1444 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1456 *extents_to_split = *extents_to_split + 2;
1457 } else if (phys) {
1458
1459
1460
1461
1462 phys++;
1463 }
1464
1465
1466
1467
1468
1469
1470
1471 if (desc->c_cpos >= wc->w_first_new_cpos) {
1472 BUG_ON(phys == 0);
1473 desc->c_needs_zero = 1;
1474 }
1475
1476 desc->c_phys = phys;
1477 if (phys == 0) {
1478 desc->c_new = 1;
1479 desc->c_needs_zero = 1;
1480 *clusters_to_alloc = *clusters_to_alloc + 1;
1481 }
1482
1483 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
1484 desc->c_unwritten = 1;
1485 desc->c_needs_zero = 1;
1486 }
1487
1488 num_clusters--;
1489 }
1490
1491 ret = 0;
1492out:
1493 return ret;
1494}
1495
1496static int ocfs2_write_begin_inline(struct address_space *mapping,
1497 struct inode *inode,
1498 struct ocfs2_write_ctxt *wc)
1499{
1500 int ret;
1501 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1502 struct page *page;
1503 handle_t *handle;
1504 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1505
1506 page = find_or_create_page(mapping, 0, GFP_NOFS);
1507 if (!page) {
1508 ret = -ENOMEM;
1509 mlog_errno(ret);
1510 goto out;
1511 }
1512
1513
1514
1515
1516 wc->w_pages[0] = wc->w_target_page = page;
1517 wc->w_num_pages = 1;
1518
1519 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1520 if (IS_ERR(handle)) {
1521 ret = PTR_ERR(handle);
1522 mlog_errno(ret);
1523 goto out;
1524 }
1525
1526 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1527 OCFS2_JOURNAL_ACCESS_WRITE);
1528 if (ret) {
1529 ocfs2_commit_trans(osb, handle);
1530
1531 mlog_errno(ret);
1532 goto out;
1533 }
1534
1535 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1536 ocfs2_set_inode_data_inline(inode, di);
1537
1538 if (!PageUptodate(page)) {
1539 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1540 if (ret) {
1541 ocfs2_commit_trans(osb, handle);
1542
1543 goto out;
1544 }
1545 }
1546
1547 wc->w_handle = handle;
1548out:
1549 return ret;
1550}
1551
1552int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1553{
1554 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1555
1556 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1557 return 1;
1558 return 0;
1559}
1560
1561static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1562 struct inode *inode, loff_t pos,
1563 unsigned len, struct page *mmap_page,
1564 struct ocfs2_write_ctxt *wc)
1565{
1566 int ret, written = 0;
1567 loff_t end = pos + len;
1568 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1569 struct ocfs2_dinode *di = NULL;
1570
1571 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1572 len, (unsigned long long)pos,
1573 oi->ip_dyn_features);
1574
1575
1576
1577
1578 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1579 if (mmap_page == NULL &&
1580 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1581 goto do_inline_write;
1582
1583
1584
1585
1586
1587 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1588 if (ret)
1589 mlog_errno(ret);
1590 goto out;
1591 }
1592
1593
1594
1595
1596 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1597 return 0;
1598
1599
1600
1601
1602 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1603 if (mmap_page ||
1604 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
1605 return 0;
1606
1607do_inline_write:
1608 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1609 if (ret) {
1610 mlog_errno(ret);
1611 goto out;
1612 }
1613
1614
1615
1616
1617
1618 written = 1;
1619out:
1620 return written ? written : ret;
1621}
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1633 struct buffer_head *di_bh,
1634 loff_t pos, unsigned len,
1635 struct ocfs2_write_ctxt *wc)
1636{
1637 int ret;
1638 loff_t newsize = pos + len;
1639
1640 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1641
1642 if (newsize <= i_size_read(inode))
1643 return 0;
1644
1645 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
1646 if (ret)
1647 mlog_errno(ret);
1648
1649 wc->w_first_new_cpos =
1650 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1651
1652 return ret;
1653}
1654
1655static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1656 loff_t pos)
1657{
1658 int ret = 0;
1659
1660 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1661 if (pos > i_size_read(inode))
1662 ret = ocfs2_zero_extend(inode, di_bh, pos);
1663
1664 return ret;
1665}
1666
1667
1668
1669
1670
1671
1672static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
1673 unsigned int needed)
1674{
1675 tid_t target;
1676 int ret = 0;
1677 unsigned int truncated_clusters;
1678
1679 mutex_lock(&osb->osb_tl_inode->i_mutex);
1680 truncated_clusters = osb->truncated_clusters;
1681 mutex_unlock(&osb->osb_tl_inode->i_mutex);
1682
1683
1684
1685
1686
1687 if (truncated_clusters < needed)
1688 goto out;
1689
1690 ret = ocfs2_flush_truncate_log(osb);
1691 if (ret) {
1692 mlog_errno(ret);
1693 goto out;
1694 }
1695
1696 if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
1697 jbd2_log_wait_commit(osb->journal->j_journal, target);
1698 ret = 1;
1699 }
1700out:
1701 return ret;
1702}
1703
1704int ocfs2_write_begin_nolock(struct file *filp,
1705 struct address_space *mapping,
1706 loff_t pos, unsigned len, unsigned flags,
1707 struct page **pagep, void **fsdata,
1708 struct buffer_head *di_bh, struct page *mmap_page)
1709{
1710 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
1711 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
1712 struct ocfs2_write_ctxt *wc;
1713 struct inode *inode = mapping->host;
1714 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1715 struct ocfs2_dinode *di;
1716 struct ocfs2_alloc_context *data_ac = NULL;
1717 struct ocfs2_alloc_context *meta_ac = NULL;
1718 handle_t *handle;
1719 struct ocfs2_extent_tree et;
1720 int try_free = 1, ret1;
1721
1722try_again:
1723 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
1724 if (ret) {
1725 mlog_errno(ret);
1726 return ret;
1727 }
1728
1729 if (ocfs2_supports_inline_data(osb)) {
1730 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1731 mmap_page, wc);
1732 if (ret == 1) {
1733 ret = 0;
1734 goto success;
1735 }
1736 if (ret < 0) {
1737 mlog_errno(ret);
1738 goto out;
1739 }
1740 }
1741
1742 if (ocfs2_sparse_alloc(osb))
1743 ret = ocfs2_zero_tail(inode, di_bh, pos);
1744 else
1745 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, len,
1746 wc);
1747 if (ret) {
1748 mlog_errno(ret);
1749 goto out;
1750 }
1751
1752 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1753 if (ret < 0) {
1754 mlog_errno(ret);
1755 goto out;
1756 } else if (ret == 1) {
1757 clusters_need = wc->w_clen;
1758 ret = ocfs2_refcount_cow(inode, filp, di_bh,
1759 wc->w_cpos, wc->w_clen, UINT_MAX);
1760 if (ret) {
1761 mlog_errno(ret);
1762 goto out;
1763 }
1764 }
1765
1766 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1767 &extents_to_split);
1768 if (ret) {
1769 mlog_errno(ret);
1770 goto out;
1771 }
1772 clusters_need += clusters_to_alloc;
1773
1774 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1775
1776 trace_ocfs2_write_begin_nolock(
1777 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1778 (long long)i_size_read(inode),
1779 le32_to_cpu(di->i_clusters),
1780 pos, len, flags, mmap_page,
1781 clusters_to_alloc, extents_to_split);
1782
1783
1784
1785
1786
1787
1788
1789 if (clusters_to_alloc || extents_to_split) {
1790
1791
1792
1793
1794
1795 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1796 wc->w_di_bh);
1797 ret = ocfs2_lock_allocators(inode, &et,
1798 clusters_to_alloc, extents_to_split,
1799 &data_ac, &meta_ac);
1800 if (ret) {
1801 mlog_errno(ret);
1802 goto out;
1803 }
1804
1805 if (data_ac)
1806 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1807
1808 credits = ocfs2_calc_extend_credits(inode->i_sb,
1809 &di->id2.i_list,
1810 clusters_to_alloc);
1811
1812 }
1813
1814
1815
1816
1817
1818
1819 if (clusters_to_alloc || extents_to_split ||
1820 (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1821 wc->w_desc[wc->w_clen - 1].c_needs_zero)))
1822 cluster_of_pages = 1;
1823 else
1824 cluster_of_pages = 0;
1825
1826 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
1827
1828 handle = ocfs2_start_trans(osb, credits);
1829 if (IS_ERR(handle)) {
1830 ret = PTR_ERR(handle);
1831 mlog_errno(ret);
1832 goto out;
1833 }
1834
1835 wc->w_handle = handle;
1836
1837 if (clusters_to_alloc) {
1838 ret = dquot_alloc_space_nodirty(inode,
1839 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1840 if (ret)
1841 goto out_commit;
1842 }
1843
1844
1845
1846
1847 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1848 OCFS2_JOURNAL_ACCESS_WRITE);
1849 if (ret) {
1850 mlog_errno(ret);
1851 goto out_quota;
1852 }
1853
1854
1855
1856
1857
1858
1859 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
1860 cluster_of_pages, mmap_page);
1861 if (ret && ret != -EAGAIN) {
1862 mlog_errno(ret);
1863 goto out_quota;
1864 }
1865
1866
1867
1868
1869
1870
1871
1872 if (ret == -EAGAIN) {
1873 BUG_ON(wc->w_target_page);
1874 ret = 0;
1875 goto out_quota;
1876 }
1877
1878 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1879 len);
1880 if (ret) {
1881 mlog_errno(ret);
1882 goto out_quota;
1883 }
1884
1885 if (data_ac)
1886 ocfs2_free_alloc_context(data_ac);
1887 if (meta_ac)
1888 ocfs2_free_alloc_context(meta_ac);
1889
1890success:
1891 *pagep = wc->w_target_page;
1892 *fsdata = wc;
1893 return 0;
1894out_quota:
1895 if (clusters_to_alloc)
1896 dquot_free_space(inode,
1897 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1898out_commit:
1899 ocfs2_commit_trans(osb, handle);
1900
1901out:
1902 ocfs2_free_write_ctxt(wc);
1903
1904 if (data_ac)
1905 ocfs2_free_alloc_context(data_ac);
1906 if (meta_ac)
1907 ocfs2_free_alloc_context(meta_ac);
1908
1909 if (ret == -ENOSPC && try_free) {
1910
1911
1912
1913
1914 try_free = 0;
1915
1916 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1917 if (ret1 == 1)
1918 goto try_again;
1919
1920 if (ret1 < 0)
1921 mlog_errno(ret1);
1922 }
1923
1924 return ret;
1925}
1926
1927static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1928 loff_t pos, unsigned len, unsigned flags,
1929 struct page **pagep, void **fsdata)
1930{
1931 int ret;
1932 struct buffer_head *di_bh = NULL;
1933 struct inode *inode = mapping->host;
1934
1935 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1936 if (ret) {
1937 mlog_errno(ret);
1938 return ret;
1939 }
1940
1941
1942
1943
1944
1945
1946
1947
1948 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1949
1950 ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
1951 fsdata, di_bh, NULL);
1952 if (ret) {
1953 mlog_errno(ret);
1954 goto out_fail;
1955 }
1956
1957 brelse(di_bh);
1958
1959 return 0;
1960
1961out_fail:
1962 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1963
1964 brelse(di_bh);
1965 ocfs2_inode_unlock(inode, 1);
1966
1967 return ret;
1968}
1969
1970static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1971 unsigned len, unsigned *copied,
1972 struct ocfs2_dinode *di,
1973 struct ocfs2_write_ctxt *wc)
1974{
1975 void *kaddr;
1976
1977 if (unlikely(*copied < len)) {
1978 if (!PageUptodate(wc->w_target_page)) {
1979 *copied = 0;
1980 return;
1981 }
1982 }
1983
1984 kaddr = kmap_atomic(wc->w_target_page, KM_USER0);
1985 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1986 kunmap_atomic(kaddr, KM_USER0);
1987
1988 trace_ocfs2_write_end_inline(
1989 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1990 (unsigned long long)pos, *copied,
1991 le16_to_cpu(di->id2.i_data.id_count),
1992 le16_to_cpu(di->i_dyn_features));
1993}
1994
1995int ocfs2_write_end_nolock(struct address_space *mapping,
1996 loff_t pos, unsigned len, unsigned copied,
1997 struct page *page, void *fsdata)
1998{
1999 int i;
2000 unsigned from, to, start = pos & (PAGE_CACHE_SIZE - 1);
2001 struct inode *inode = mapping->host;
2002 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2003 struct ocfs2_write_ctxt *wc = fsdata;
2004 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
2005 handle_t *handle = wc->w_handle;
2006 struct page *tmppage;
2007
2008 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2009 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
2010 goto out_write_size;
2011 }
2012
2013 if (unlikely(copied < len)) {
2014 if (!PageUptodate(wc->w_target_page))
2015 copied = 0;
2016
2017 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
2018 start+len);
2019 }
2020 flush_dcache_page(wc->w_target_page);
2021
2022 for(i = 0; i < wc->w_num_pages; i++) {
2023 tmppage = wc->w_pages[i];
2024
2025 if (tmppage == wc->w_target_page) {
2026 from = wc->w_target_from;
2027 to = wc->w_target_to;
2028
2029 BUG_ON(from > PAGE_CACHE_SIZE ||
2030 to > PAGE_CACHE_SIZE ||
2031 to < from);
2032 } else {
2033
2034
2035
2036
2037
2038 from = 0;
2039 to = PAGE_CACHE_SIZE;
2040 }
2041
2042 if (page_has_buffers(tmppage)) {
2043 if (ocfs2_should_order_data(inode))
2044 ocfs2_jbd2_file_inode(wc->w_handle, inode);
2045 block_commit_write(tmppage, from, to);
2046 }
2047 }
2048
2049out_write_size:
2050 pos += copied;
2051 if (pos > inode->i_size) {
2052 i_size_write(inode, pos);
2053 mark_inode_dirty(inode);
2054 }
2055 inode->i_blocks = ocfs2_inode_sector_count(inode);
2056 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2057 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2058 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2059 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
2060 ocfs2_journal_dirty(handle, wc->w_di_bh);
2061
2062 ocfs2_commit_trans(osb, handle);
2063
2064 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2065
2066 ocfs2_free_write_ctxt(wc);
2067
2068 return copied;
2069}
2070
2071static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2072 loff_t pos, unsigned len, unsigned copied,
2073 struct page *page, void *fsdata)
2074{
2075 int ret;
2076 struct inode *inode = mapping->host;
2077
2078 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata);
2079
2080 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2081 ocfs2_inode_unlock(inode, 1);
2082
2083 return ret;
2084}
2085
2086const struct address_space_operations ocfs2_aops = {
2087 .readpage = ocfs2_readpage,
2088 .readpages = ocfs2_readpages,
2089 .writepage = ocfs2_writepage,
2090 .write_begin = ocfs2_write_begin,
2091 .write_end = ocfs2_write_end,
2092 .bmap = ocfs2_bmap,
2093 .direct_IO = ocfs2_direct_IO,
2094 .invalidatepage = ocfs2_invalidatepage,
2095 .releasepage = ocfs2_releasepage,
2096 .migratepage = buffer_migrate_page,
2097 .is_partially_uptodate = block_is_partially_uptodate,
2098 .error_remove_page = generic_error_remove_page,
2099};
2100