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18#include "xfs.h"
19#include "xfs_log.h"
20#include "xfs_sb.h"
21#include "xfs_ag.h"
22#include "xfs_trans.h"
23#include "xfs_mount.h"
24#include "xfs_bmap_btree.h"
25#include "xfs_dinode.h"
26#include "xfs_inode.h"
27#include "xfs_inode_item.h"
28#include "xfs_alloc.h"
29#include "xfs_error.h"
30#include "xfs_iomap.h"
31#include "xfs_vnodeops.h"
32#include "xfs_trace.h"
33#include "xfs_bmap.h"
34#include <linux/gfp.h>
35#include <linux/mpage.h>
36#include <linux/pagevec.h>
37#include <linux/writeback.h>
38
39void
40xfs_count_page_state(
41 struct page *page,
42 int *delalloc,
43 int *unwritten)
44{
45 struct buffer_head *bh, *head;
46
47 *delalloc = *unwritten = 0;
48
49 bh = head = page_buffers(page);
50 do {
51 if (buffer_unwritten(bh))
52 (*unwritten) = 1;
53 else if (buffer_delay(bh))
54 (*delalloc) = 1;
55 } while ((bh = bh->b_this_page) != head);
56}
57
58STATIC struct block_device *
59xfs_find_bdev_for_inode(
60 struct inode *inode)
61{
62 struct xfs_inode *ip = XFS_I(inode);
63 struct xfs_mount *mp = ip->i_mount;
64
65 if (XFS_IS_REALTIME_INODE(ip))
66 return mp->m_rtdev_targp->bt_bdev;
67 else
68 return mp->m_ddev_targp->bt_bdev;
69}
70
71
72
73
74
75
76
77STATIC void
78xfs_destroy_ioend(
79 xfs_ioend_t *ioend)
80{
81 struct buffer_head *bh, *next;
82
83 for (bh = ioend->io_buffer_head; bh; bh = next) {
84 next = bh->b_private;
85 bh->b_end_io(bh, !ioend->io_error);
86 }
87
88 if (ioend->io_iocb) {
89 if (ioend->io_isasync) {
90 aio_complete(ioend->io_iocb, ioend->io_error ?
91 ioend->io_error : ioend->io_result, 0);
92 }
93 inode_dio_done(ioend->io_inode);
94 }
95
96 mempool_free(ioend, xfs_ioend_pool);
97}
98
99
100
101
102static inline bool xfs_ioend_is_append(struct xfs_ioend *ioend)
103{
104 return ioend->io_offset + ioend->io_size >
105 XFS_I(ioend->io_inode)->i_d.di_size;
106}
107
108STATIC int
109xfs_setfilesize_trans_alloc(
110 struct xfs_ioend *ioend)
111{
112 struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
113 struct xfs_trans *tp;
114 int error;
115
116 tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
117
118 error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
119 if (error) {
120 xfs_trans_cancel(tp, 0);
121 return error;
122 }
123
124 ioend->io_append_trans = tp;
125
126
127
128
129
130 rwsem_release(&ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1],
131 1, _THIS_IP_);
132
133
134
135
136 current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
137 return 0;
138}
139
140
141
142
143STATIC int
144xfs_setfilesize(
145 struct xfs_ioend *ioend)
146{
147 struct xfs_inode *ip = XFS_I(ioend->io_inode);
148 struct xfs_trans *tp = ioend->io_append_trans;
149 xfs_fsize_t isize;
150
151
152
153
154
155
156 current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
157
158 xfs_ilock(ip, XFS_ILOCK_EXCL);
159 isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size);
160 if (!isize) {
161 xfs_iunlock(ip, XFS_ILOCK_EXCL);
162 xfs_trans_cancel(tp, 0);
163 return 0;
164 }
165
166 trace_xfs_setfilesize(ip, ioend->io_offset, ioend->io_size);
167
168 ip->i_d.di_size = isize;
169 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
170 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
171
172 return xfs_trans_commit(tp, 0);
173}
174
175
176
177
178
179
180
181STATIC void
182xfs_finish_ioend(
183 struct xfs_ioend *ioend)
184{
185 if (atomic_dec_and_test(&ioend->io_remaining)) {
186 struct xfs_mount *mp = XFS_I(ioend->io_inode)->i_mount;
187
188 if (ioend->io_type == XFS_IO_UNWRITTEN)
189 queue_work(mp->m_unwritten_workqueue, &ioend->io_work);
190 else if (ioend->io_append_trans)
191 queue_work(mp->m_data_workqueue, &ioend->io_work);
192 else
193 xfs_destroy_ioend(ioend);
194 }
195}
196
197
198
199
200STATIC void
201xfs_end_io(
202 struct work_struct *work)
203{
204 xfs_ioend_t *ioend = container_of(work, xfs_ioend_t, io_work);
205 struct xfs_inode *ip = XFS_I(ioend->io_inode);
206 int error = 0;
207
208 if (ioend->io_append_trans) {
209
210
211
212
213 rwsem_acquire_read(
214 &ioend->io_inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1],
215 0, 1, _THIS_IP_);
216 }
217 if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
218 ioend->io_error = -EIO;
219 goto done;
220 }
221 if (ioend->io_error)
222 goto done;
223
224
225
226
227
228 if (ioend->io_type == XFS_IO_UNWRITTEN) {
229
230
231
232
233
234
235 if (ioend->io_append_trans) {
236 ASSERT(ioend->io_isdirect);
237
238 current_set_flags_nested(
239 &ioend->io_append_trans->t_pflags, PF_FSTRANS);
240 xfs_trans_cancel(ioend->io_append_trans, 0);
241 }
242
243 error = xfs_iomap_write_unwritten(ip, ioend->io_offset,
244 ioend->io_size);
245 if (error) {
246 ioend->io_error = -error;
247 goto done;
248 }
249 } else if (ioend->io_append_trans) {
250 error = xfs_setfilesize(ioend);
251 if (error)
252 ioend->io_error = -error;
253 } else {
254 ASSERT(!xfs_ioend_is_append(ioend));
255 }
256
257done:
258 xfs_destroy_ioend(ioend);
259}
260
261
262
263
264STATIC void
265xfs_finish_ioend_sync(
266 struct xfs_ioend *ioend)
267{
268 if (atomic_dec_and_test(&ioend->io_remaining))
269 xfs_end_io(&ioend->io_work);
270}
271
272
273
274
275
276
277
278STATIC xfs_ioend_t *
279xfs_alloc_ioend(
280 struct inode *inode,
281 unsigned int type)
282{
283 xfs_ioend_t *ioend;
284
285 ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS);
286
287
288
289
290
291
292 atomic_set(&ioend->io_remaining, 1);
293 ioend->io_isasync = 0;
294 ioend->io_isdirect = 0;
295 ioend->io_error = 0;
296 ioend->io_list = NULL;
297 ioend->io_type = type;
298 ioend->io_inode = inode;
299 ioend->io_buffer_head = NULL;
300 ioend->io_buffer_tail = NULL;
301 ioend->io_offset = 0;
302 ioend->io_size = 0;
303 ioend->io_iocb = NULL;
304 ioend->io_result = 0;
305 ioend->io_append_trans = NULL;
306
307 INIT_WORK(&ioend->io_work, xfs_end_io);
308 return ioend;
309}
310
311STATIC int
312xfs_map_blocks(
313 struct inode *inode,
314 loff_t offset,
315 struct xfs_bmbt_irec *imap,
316 int type,
317 int nonblocking)
318{
319 struct xfs_inode *ip = XFS_I(inode);
320 struct xfs_mount *mp = ip->i_mount;
321 ssize_t count = 1 << inode->i_blkbits;
322 xfs_fileoff_t offset_fsb, end_fsb;
323 int error = 0;
324 int bmapi_flags = XFS_BMAPI_ENTIRE;
325 int nimaps = 1;
326
327 if (XFS_FORCED_SHUTDOWN(mp))
328 return -XFS_ERROR(EIO);
329
330 if (type == XFS_IO_UNWRITTEN)
331 bmapi_flags |= XFS_BMAPI_IGSTATE;
332
333 if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
334 if (nonblocking)
335 return -XFS_ERROR(EAGAIN);
336 xfs_ilock(ip, XFS_ILOCK_SHARED);
337 }
338
339 ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
340 (ip->i_df.if_flags & XFS_IFEXTENTS));
341 ASSERT(offset <= mp->m_super->s_maxbytes);
342
343 if (offset + count > mp->m_super->s_maxbytes)
344 count = mp->m_super->s_maxbytes - offset;
345 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
346 offset_fsb = XFS_B_TO_FSBT(mp, offset);
347 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
348 imap, &nimaps, bmapi_flags);
349 xfs_iunlock(ip, XFS_ILOCK_SHARED);
350
351 if (error)
352 return -XFS_ERROR(error);
353
354 if (type == XFS_IO_DELALLOC &&
355 (!nimaps || isnullstartblock(imap->br_startblock))) {
356 error = xfs_iomap_write_allocate(ip, offset, count, imap);
357 if (!error)
358 trace_xfs_map_blocks_alloc(ip, offset, count, type, imap);
359 return -XFS_ERROR(error);
360 }
361
362#ifdef DEBUG
363 if (type == XFS_IO_UNWRITTEN) {
364 ASSERT(nimaps);
365 ASSERT(imap->br_startblock != HOLESTARTBLOCK);
366 ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
367 }
368#endif
369 if (nimaps)
370 trace_xfs_map_blocks_found(ip, offset, count, type, imap);
371 return 0;
372}
373
374STATIC int
375xfs_imap_valid(
376 struct inode *inode,
377 struct xfs_bmbt_irec *imap,
378 xfs_off_t offset)
379{
380 offset >>= inode->i_blkbits;
381
382 return offset >= imap->br_startoff &&
383 offset < imap->br_startoff + imap->br_blockcount;
384}
385
386
387
388
389STATIC void
390xfs_end_bio(
391 struct bio *bio,
392 int error)
393{
394 xfs_ioend_t *ioend = bio->bi_private;
395
396 ASSERT(atomic_read(&bio->bi_cnt) >= 1);
397 ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error;
398
399
400 bio->bi_private = NULL;
401 bio->bi_end_io = NULL;
402 bio_put(bio);
403
404 xfs_finish_ioend(ioend);
405}
406
407STATIC void
408xfs_submit_ioend_bio(
409 struct writeback_control *wbc,
410 xfs_ioend_t *ioend,
411 struct bio *bio)
412{
413 atomic_inc(&ioend->io_remaining);
414 bio->bi_private = ioend;
415 bio->bi_end_io = xfs_end_bio;
416 submit_bio(wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE, bio);
417}
418
419STATIC struct bio *
420xfs_alloc_ioend_bio(
421 struct buffer_head *bh)
422{
423 int nvecs = bio_get_nr_vecs(bh->b_bdev);
424 struct bio *bio = bio_alloc(GFP_NOIO, nvecs);
425
426 ASSERT(bio->bi_private == NULL);
427 bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
428 bio->bi_bdev = bh->b_bdev;
429 return bio;
430}
431
432STATIC void
433xfs_start_buffer_writeback(
434 struct buffer_head *bh)
435{
436 ASSERT(buffer_mapped(bh));
437 ASSERT(buffer_locked(bh));
438 ASSERT(!buffer_delay(bh));
439 ASSERT(!buffer_unwritten(bh));
440
441 mark_buffer_async_write(bh);
442 set_buffer_uptodate(bh);
443 clear_buffer_dirty(bh);
444}
445
446STATIC void
447xfs_start_page_writeback(
448 struct page *page,
449 int clear_dirty,
450 int buffers)
451{
452 ASSERT(PageLocked(page));
453 ASSERT(!PageWriteback(page));
454 if (clear_dirty)
455 clear_page_dirty_for_io(page);
456 set_page_writeback(page);
457 unlock_page(page);
458
459 if (!buffers)
460 end_page_writeback(page);
461}
462
463static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh)
464{
465 return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
466}
467
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482
483
484
485
486
487
488
489
490STATIC void
491xfs_submit_ioend(
492 struct writeback_control *wbc,
493 xfs_ioend_t *ioend,
494 int fail)
495{
496 xfs_ioend_t *head = ioend;
497 xfs_ioend_t *next;
498 struct buffer_head *bh;
499 struct bio *bio;
500 sector_t lastblock = 0;
501
502
503 do {
504 next = ioend->io_list;
505 for (bh = ioend->io_buffer_head; bh; bh = bh->b_private)
506 xfs_start_buffer_writeback(bh);
507 } while ((ioend = next) != NULL);
508
509
510 ioend = head;
511 do {
512 next = ioend->io_list;
513 bio = NULL;
514
515
516
517
518
519
520
521 if (fail) {
522 ioend->io_error = -fail;
523 xfs_finish_ioend(ioend);
524 continue;
525 }
526
527 for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) {
528
529 if (!bio) {
530 retry:
531 bio = xfs_alloc_ioend_bio(bh);
532 } else if (bh->b_blocknr != lastblock + 1) {
533 xfs_submit_ioend_bio(wbc, ioend, bio);
534 goto retry;
535 }
536
537 if (bio_add_buffer(bio, bh) != bh->b_size) {
538 xfs_submit_ioend_bio(wbc, ioend, bio);
539 goto retry;
540 }
541
542 lastblock = bh->b_blocknr;
543 }
544 if (bio)
545 xfs_submit_ioend_bio(wbc, ioend, bio);
546 xfs_finish_ioend(ioend);
547 } while ((ioend = next) != NULL);
548}
549
550
551
552
553
554
555STATIC void
556xfs_cancel_ioend(
557 xfs_ioend_t *ioend)
558{
559 xfs_ioend_t *next;
560 struct buffer_head *bh, *next_bh;
561
562 do {
563 next = ioend->io_list;
564 bh = ioend->io_buffer_head;
565 do {
566 next_bh = bh->b_private;
567 clear_buffer_async_write(bh);
568 unlock_buffer(bh);
569 } while ((bh = next_bh) != NULL);
570
571 mempool_free(ioend, xfs_ioend_pool);
572 } while ((ioend = next) != NULL);
573}
574
575
576
577
578
579
580
581STATIC void
582xfs_add_to_ioend(
583 struct inode *inode,
584 struct buffer_head *bh,
585 xfs_off_t offset,
586 unsigned int type,
587 xfs_ioend_t **result,
588 int need_ioend)
589{
590 xfs_ioend_t *ioend = *result;
591
592 if (!ioend || need_ioend || type != ioend->io_type) {
593 xfs_ioend_t *previous = *result;
594
595 ioend = xfs_alloc_ioend(inode, type);
596 ioend->io_offset = offset;
597 ioend->io_buffer_head = bh;
598 ioend->io_buffer_tail = bh;
599 if (previous)
600 previous->io_list = ioend;
601 *result = ioend;
602 } else {
603 ioend->io_buffer_tail->b_private = bh;
604 ioend->io_buffer_tail = bh;
605 }
606
607 bh->b_private = NULL;
608 ioend->io_size += bh->b_size;
609}
610
611STATIC void
612xfs_map_buffer(
613 struct inode *inode,
614 struct buffer_head *bh,
615 struct xfs_bmbt_irec *imap,
616 xfs_off_t offset)
617{
618 sector_t bn;
619 struct xfs_mount *m = XFS_I(inode)->i_mount;
620 xfs_off_t iomap_offset = XFS_FSB_TO_B(m, imap->br_startoff);
621 xfs_daddr_t iomap_bn = xfs_fsb_to_db(XFS_I(inode), imap->br_startblock);
622
623 ASSERT(imap->br_startblock != HOLESTARTBLOCK);
624 ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
625
626 bn = (iomap_bn >> (inode->i_blkbits - BBSHIFT)) +
627 ((offset - iomap_offset) >> inode->i_blkbits);
628
629 ASSERT(bn || XFS_IS_REALTIME_INODE(XFS_I(inode)));
630
631 bh->b_blocknr = bn;
632 set_buffer_mapped(bh);
633}
634
635STATIC void
636xfs_map_at_offset(
637 struct inode *inode,
638 struct buffer_head *bh,
639 struct xfs_bmbt_irec *imap,
640 xfs_off_t offset)
641{
642 ASSERT(imap->br_startblock != HOLESTARTBLOCK);
643 ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
644
645 xfs_map_buffer(inode, bh, imap, offset);
646 set_buffer_mapped(bh);
647 clear_buffer_delay(bh);
648 clear_buffer_unwritten(bh);
649}
650
651
652
653
654
655STATIC int
656xfs_check_page_type(
657 struct page *page,
658 unsigned int type)
659{
660 if (PageWriteback(page))
661 return 0;
662
663 if (page->mapping && page_has_buffers(page)) {
664 struct buffer_head *bh, *head;
665 int acceptable = 0;
666
667 bh = head = page_buffers(page);
668 do {
669 if (buffer_unwritten(bh))
670 acceptable += (type == XFS_IO_UNWRITTEN);
671 else if (buffer_delay(bh))
672 acceptable += (type == XFS_IO_DELALLOC);
673 else if (buffer_dirty(bh) && buffer_mapped(bh))
674 acceptable += (type == XFS_IO_OVERWRITE);
675 else
676 break;
677 } while ((bh = bh->b_this_page) != head);
678
679 if (acceptable)
680 return 1;
681 }
682
683 return 0;
684}
685
686
687
688
689
690
691
692STATIC int
693xfs_convert_page(
694 struct inode *inode,
695 struct page *page,
696 loff_t tindex,
697 struct xfs_bmbt_irec *imap,
698 xfs_ioend_t **ioendp,
699 struct writeback_control *wbc)
700{
701 struct buffer_head *bh, *head;
702 xfs_off_t end_offset;
703 unsigned long p_offset;
704 unsigned int type;
705 int len, page_dirty;
706 int count = 0, done = 0, uptodate = 1;
707 xfs_off_t offset = page_offset(page);
708
709 if (page->index != tindex)
710 goto fail;
711 if (!trylock_page(page))
712 goto fail;
713 if (PageWriteback(page))
714 goto fail_unlock_page;
715 if (page->mapping != inode->i_mapping)
716 goto fail_unlock_page;
717 if (!xfs_check_page_type(page, (*ioendp)->io_type))
718 goto fail_unlock_page;
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733 end_offset = min_t(unsigned long long,
734 (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT,
735 i_size_read(inode));
736
737 len = 1 << inode->i_blkbits;
738 p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1),
739 PAGE_CACHE_SIZE);
740 p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
741 page_dirty = p_offset / len;
742
743 bh = head = page_buffers(page);
744 do {
745 if (offset >= end_offset)
746 break;
747 if (!buffer_uptodate(bh))
748 uptodate = 0;
749 if (!(PageUptodate(page) || buffer_uptodate(bh))) {
750 done = 1;
751 continue;
752 }
753
754 if (buffer_unwritten(bh) || buffer_delay(bh) ||
755 buffer_mapped(bh)) {
756 if (buffer_unwritten(bh))
757 type = XFS_IO_UNWRITTEN;
758 else if (buffer_delay(bh))
759 type = XFS_IO_DELALLOC;
760 else
761 type = XFS_IO_OVERWRITE;
762
763 if (!xfs_imap_valid(inode, imap, offset)) {
764 done = 1;
765 continue;
766 }
767
768 lock_buffer(bh);
769 if (type != XFS_IO_OVERWRITE)
770 xfs_map_at_offset(inode, bh, imap, offset);
771 xfs_add_to_ioend(inode, bh, offset, type,
772 ioendp, done);
773
774 page_dirty--;
775 count++;
776 } else {
777 done = 1;
778 }
779 } while (offset += len, (bh = bh->b_this_page) != head);
780
781 if (uptodate && bh == head)
782 SetPageUptodate(page);
783
784 if (count) {
785 if (--wbc->nr_to_write <= 0 &&
786 wbc->sync_mode == WB_SYNC_NONE)
787 done = 1;
788 }
789 xfs_start_page_writeback(page, !page_dirty, count);
790
791 return done;
792 fail_unlock_page:
793 unlock_page(page);
794 fail:
795 return 1;
796}
797
798
799
800
801
802STATIC void
803xfs_cluster_write(
804 struct inode *inode,
805 pgoff_t tindex,
806 struct xfs_bmbt_irec *imap,
807 xfs_ioend_t **ioendp,
808 struct writeback_control *wbc,
809 pgoff_t tlast)
810{
811 struct pagevec pvec;
812 int done = 0, i;
813
814 pagevec_init(&pvec, 0);
815 while (!done && tindex <= tlast) {
816 unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1);
817
818 if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len))
819 break;
820
821 for (i = 0; i < pagevec_count(&pvec); i++) {
822 done = xfs_convert_page(inode, pvec.pages[i], tindex++,
823 imap, ioendp, wbc);
824 if (done)
825 break;
826 }
827
828 pagevec_release(&pvec);
829 cond_resched();
830 }
831}
832
833STATIC void
834xfs_vm_invalidatepage(
835 struct page *page,
836 unsigned long offset)
837{
838 trace_xfs_invalidatepage(page->mapping->host, page, offset);
839 block_invalidatepage(page, offset);
840}
841
842
843
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845
846
847
848
849
850
851
852
853
854
855
856
857
858STATIC void
859xfs_aops_discard_page(
860 struct page *page)
861{
862 struct inode *inode = page->mapping->host;
863 struct xfs_inode *ip = XFS_I(inode);
864 struct buffer_head *bh, *head;
865 loff_t offset = page_offset(page);
866
867 if (!xfs_check_page_type(page, XFS_IO_DELALLOC))
868 goto out_invalidate;
869
870 if (XFS_FORCED_SHUTDOWN(ip->i_mount))
871 goto out_invalidate;
872
873 xfs_alert(ip->i_mount,
874 "page discard on page %p, inode 0x%llx, offset %llu.",
875 page, ip->i_ino, offset);
876
877 xfs_ilock(ip, XFS_ILOCK_EXCL);
878 bh = head = page_buffers(page);
879 do {
880 int error;
881 xfs_fileoff_t start_fsb;
882
883 if (!buffer_delay(bh))
884 goto next_buffer;
885
886 start_fsb = XFS_B_TO_FSBT(ip->i_mount, offset);
887 error = xfs_bmap_punch_delalloc_range(ip, start_fsb, 1);
888 if (error) {
889
890 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
891 xfs_alert(ip->i_mount,
892 "page discard unable to remove delalloc mapping.");
893 }
894 break;
895 }
896next_buffer:
897 offset += 1 << inode->i_blkbits;
898
899 } while ((bh = bh->b_this_page) != head);
900
901 xfs_iunlock(ip, XFS_ILOCK_EXCL);
902out_invalidate:
903 xfs_vm_invalidatepage(page, 0);
904 return;
905}
906
907
908
909
910
911
912
913
914
915STATIC int
916xfs_vm_writepage(
917 struct page *page,
918 struct writeback_control *wbc)
919{
920 struct inode *inode = page->mapping->host;
921 struct buffer_head *bh, *head;
922 struct xfs_bmbt_irec imap;
923 xfs_ioend_t *ioend = NULL, *iohead = NULL;
924 loff_t offset;
925 unsigned int type;
926 __uint64_t end_offset;
927 pgoff_t end_index, last_index;
928 ssize_t len;
929 int err, imap_valid = 0, uptodate = 1;
930 int count = 0;
931 int nonblocking = 0;
932
933 trace_xfs_writepage(inode, page, 0);
934
935 ASSERT(page_has_buffers(page));
936
937
938
939
940
941
942
943
944
945
946
947 if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
948 PF_MEMALLOC))
949 goto redirty;
950
951
952
953
954
955 if (WARN_ON(current->flags & PF_FSTRANS))
956 goto redirty;
957
958
959 offset = i_size_read(inode);
960 end_index = offset >> PAGE_CACHE_SHIFT;
961 last_index = (offset - 1) >> PAGE_CACHE_SHIFT;
962 if (page->index >= end_index) {
963 unsigned offset_into_page = offset & (PAGE_CACHE_SIZE - 1);
964
965
966
967
968
969 if (page->index >= end_index + 1 || offset_into_page == 0) {
970 unlock_page(page);
971 return 0;
972 }
973
974
975
976
977
978
979
980
981
982 zero_user_segment(page, offset_into_page, PAGE_CACHE_SIZE);
983 }
984
985 end_offset = min_t(unsigned long long,
986 (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT,
987 offset);
988 len = 1 << inode->i_blkbits;
989
990 bh = head = page_buffers(page);
991 offset = page_offset(page);
992 type = XFS_IO_OVERWRITE;
993
994 if (wbc->sync_mode == WB_SYNC_NONE)
995 nonblocking = 1;
996
997 do {
998 int new_ioend = 0;
999
1000 if (offset >= end_offset)
1001 break;
1002 if (!buffer_uptodate(bh))
1003 uptodate = 0;
1004
1005
1006
1007
1008
1009
1010
1011 if (!buffer_mapped(bh) && buffer_uptodate(bh)) {
1012 imap_valid = 0;
1013 continue;
1014 }
1015
1016 if (buffer_unwritten(bh)) {
1017 if (type != XFS_IO_UNWRITTEN) {
1018 type = XFS_IO_UNWRITTEN;
1019 imap_valid = 0;
1020 }
1021 } else if (buffer_delay(bh)) {
1022 if (type != XFS_IO_DELALLOC) {
1023 type = XFS_IO_DELALLOC;
1024 imap_valid = 0;
1025 }
1026 } else if (buffer_uptodate(bh)) {
1027 if (type != XFS_IO_OVERWRITE) {
1028 type = XFS_IO_OVERWRITE;
1029 imap_valid = 0;
1030 }
1031 } else {
1032 if (PageUptodate(page))
1033 ASSERT(buffer_mapped(bh));
1034
1035
1036
1037
1038
1039
1040 imap_valid = 0;
1041 continue;
1042 }
1043
1044 if (imap_valid)
1045 imap_valid = xfs_imap_valid(inode, &imap, offset);
1046 if (!imap_valid) {
1047
1048
1049
1050
1051
1052
1053
1054
1055 new_ioend = 1;
1056 err = xfs_map_blocks(inode, offset, &imap, type,
1057 nonblocking);
1058 if (err)
1059 goto error;
1060 imap_valid = xfs_imap_valid(inode, &imap, offset);
1061 }
1062 if (imap_valid) {
1063 lock_buffer(bh);
1064 if (type != XFS_IO_OVERWRITE)
1065 xfs_map_at_offset(inode, bh, &imap, offset);
1066 xfs_add_to_ioend(inode, bh, offset, type, &ioend,
1067 new_ioend);
1068 count++;
1069 }
1070
1071 if (!iohead)
1072 iohead = ioend;
1073
1074 } while (offset += len, ((bh = bh->b_this_page) != head));
1075
1076 if (uptodate && bh == head)
1077 SetPageUptodate(page);
1078
1079 xfs_start_page_writeback(page, 1, count);
1080
1081
1082 if (!ioend)
1083 return 0;
1084
1085 ASSERT(iohead);
1086
1087
1088
1089
1090
1091
1092 if (imap_valid) {
1093 xfs_off_t end_index;
1094
1095 end_index = imap.br_startoff + imap.br_blockcount;
1096
1097
1098 end_index <<= inode->i_blkbits;
1099
1100
1101 end_index = (end_index - 1) >> PAGE_CACHE_SHIFT;
1102
1103
1104 if (end_index > last_index)
1105 end_index = last_index;
1106
1107 xfs_cluster_write(inode, page->index + 1, &imap, &ioend,
1108 wbc, end_index);
1109 }
1110
1111
1112
1113
1114
1115 err = 0;
1116 if (ioend->io_type != XFS_IO_UNWRITTEN && xfs_ioend_is_append(ioend))
1117 err = xfs_setfilesize_trans_alloc(ioend);
1118
1119 xfs_submit_ioend(wbc, iohead, err);
1120
1121 return 0;
1122
1123error:
1124 if (iohead)
1125 xfs_cancel_ioend(iohead);
1126
1127 if (err == -EAGAIN)
1128 goto redirty;
1129
1130 xfs_aops_discard_page(page);
1131 ClearPageUptodate(page);
1132 unlock_page(page);
1133 return err;
1134
1135redirty:
1136 redirty_page_for_writepage(wbc, page);
1137 unlock_page(page);
1138 return 0;
1139}
1140
1141STATIC int
1142xfs_vm_writepages(
1143 struct address_space *mapping,
1144 struct writeback_control *wbc)
1145{
1146 xfs_iflags_clear(XFS_I(mapping->host), XFS_ITRUNCATED);
1147 return generic_writepages(mapping, wbc);
1148}
1149
1150
1151
1152
1153
1154
1155
1156
1157STATIC int
1158xfs_vm_releasepage(
1159 struct page *page,
1160 gfp_t gfp_mask)
1161{
1162 int delalloc, unwritten;
1163
1164 trace_xfs_releasepage(page->mapping->host, page, 0);
1165
1166 xfs_count_page_state(page, &delalloc, &unwritten);
1167
1168 if (WARN_ON(delalloc))
1169 return 0;
1170 if (WARN_ON(unwritten))
1171 return 0;
1172
1173 return try_to_free_buffers(page);
1174}
1175
1176STATIC int
1177__xfs_get_blocks(
1178 struct inode *inode,
1179 sector_t iblock,
1180 struct buffer_head *bh_result,
1181 int create,
1182 int direct)
1183{
1184 struct xfs_inode *ip = XFS_I(inode);
1185 struct xfs_mount *mp = ip->i_mount;
1186 xfs_fileoff_t offset_fsb, end_fsb;
1187 int error = 0;
1188 int lockmode = 0;
1189 struct xfs_bmbt_irec imap;
1190 int nimaps = 1;
1191 xfs_off_t offset;
1192 ssize_t size;
1193 int new = 0;
1194
1195 if (XFS_FORCED_SHUTDOWN(mp))
1196 return -XFS_ERROR(EIO);
1197
1198 offset = (xfs_off_t)iblock << inode->i_blkbits;
1199 ASSERT(bh_result->b_size >= (1 << inode->i_blkbits));
1200 size = bh_result->b_size;
1201
1202 if (!create && direct && offset >= i_size_read(inode))
1203 return 0;
1204
1205
1206
1207
1208
1209
1210
1211
1212 if (create && !direct) {
1213 lockmode = XFS_ILOCK_EXCL;
1214 xfs_ilock(ip, lockmode);
1215 } else {
1216 lockmode = xfs_ilock_map_shared(ip);
1217 }
1218
1219 ASSERT(offset <= mp->m_super->s_maxbytes);
1220 if (offset + size > mp->m_super->s_maxbytes)
1221 size = mp->m_super->s_maxbytes - offset;
1222 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
1223 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1224
1225 error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
1226 &imap, &nimaps, XFS_BMAPI_ENTIRE);
1227 if (error)
1228 goto out_unlock;
1229
1230 if (create &&
1231 (!nimaps ||
1232 (imap.br_startblock == HOLESTARTBLOCK ||
1233 imap.br_startblock == DELAYSTARTBLOCK))) {
1234 if (direct || xfs_get_extsz_hint(ip)) {
1235
1236
1237
1238
1239
1240
1241 xfs_iunlock(ip, lockmode);
1242 error = xfs_iomap_write_direct(ip, offset, size,
1243 &imap, nimaps);
1244 if (error)
1245 return -error;
1246 new = 1;
1247 } else {
1248
1249
1250
1251
1252
1253
1254
1255
1256 if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
1257 new = 1;
1258 error = xfs_iomap_write_delay(ip, offset, size, &imap);
1259 if (error)
1260 goto out_unlock;
1261
1262 xfs_iunlock(ip, lockmode);
1263 }
1264
1265 trace_xfs_get_blocks_alloc(ip, offset, size, 0, &imap);
1266 } else if (nimaps) {
1267 trace_xfs_get_blocks_found(ip, offset, size, 0, &imap);
1268 xfs_iunlock(ip, lockmode);
1269 } else {
1270 trace_xfs_get_blocks_notfound(ip, offset, size);
1271 goto out_unlock;
1272 }
1273
1274 if (imap.br_startblock != HOLESTARTBLOCK &&
1275 imap.br_startblock != DELAYSTARTBLOCK) {
1276
1277
1278
1279
1280 if (create || !ISUNWRITTEN(&imap))
1281 xfs_map_buffer(inode, bh_result, &imap, offset);
1282 if (create && ISUNWRITTEN(&imap)) {
1283 if (direct)
1284 bh_result->b_private = inode;
1285 set_buffer_unwritten(bh_result);
1286 }
1287 }
1288
1289
1290
1291
1292
1293 bh_result->b_bdev = xfs_find_bdev_for_inode(inode);
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304 if (create &&
1305 ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) ||
1306 (offset >= i_size_read(inode)) ||
1307 (new || ISUNWRITTEN(&imap))))
1308 set_buffer_new(bh_result);
1309
1310 if (imap.br_startblock == DELAYSTARTBLOCK) {
1311 BUG_ON(direct);
1312 if (create) {
1313 set_buffer_uptodate(bh_result);
1314 set_buffer_mapped(bh_result);
1315 set_buffer_delay(bh_result);
1316 }
1317 }
1318
1319
1320
1321
1322
1323 if (direct || size > (1 << inode->i_blkbits)) {
1324 xfs_off_t mapping_size;
1325
1326 mapping_size = imap.br_startoff + imap.br_blockcount - iblock;
1327 mapping_size <<= inode->i_blkbits;
1328
1329 ASSERT(mapping_size > 0);
1330 if (mapping_size > size)
1331 mapping_size = size;
1332 if (mapping_size > LONG_MAX)
1333 mapping_size = LONG_MAX;
1334
1335 bh_result->b_size = mapping_size;
1336 }
1337
1338 return 0;
1339
1340out_unlock:
1341 xfs_iunlock(ip, lockmode);
1342 return -error;
1343}
1344
1345int
1346xfs_get_blocks(
1347 struct inode *inode,
1348 sector_t iblock,
1349 struct buffer_head *bh_result,
1350 int create)
1351{
1352 return __xfs_get_blocks(inode, iblock, bh_result, create, 0);
1353}
1354
1355STATIC int
1356xfs_get_blocks_direct(
1357 struct inode *inode,
1358 sector_t iblock,
1359 struct buffer_head *bh_result,
1360 int create)
1361{
1362 return __xfs_get_blocks(inode, iblock, bh_result, create, 1);
1363}
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376STATIC void
1377xfs_end_io_direct_write(
1378 struct kiocb *iocb,
1379 loff_t offset,
1380 ssize_t size,
1381 void *private,
1382 int ret,
1383 bool is_async)
1384{
1385 struct xfs_ioend *ioend = iocb->private;
1386
1387
1388
1389
1390
1391
1392
1393 if (offset + size > i_size_read(ioend->io_inode))
1394 i_size_write(ioend->io_inode, offset + size);
1395
1396
1397
1398
1399
1400
1401 iocb->private = NULL;
1402
1403 ioend->io_offset = offset;
1404 ioend->io_size = size;
1405 ioend->io_iocb = iocb;
1406 ioend->io_result = ret;
1407 if (private && size > 0)
1408 ioend->io_type = XFS_IO_UNWRITTEN;
1409
1410 if (is_async) {
1411 ioend->io_isasync = 1;
1412 xfs_finish_ioend(ioend);
1413 } else {
1414 xfs_finish_ioend_sync(ioend);
1415 }
1416}
1417
1418STATIC ssize_t
1419xfs_vm_direct_IO(
1420 int rw,
1421 struct kiocb *iocb,
1422 const struct iovec *iov,
1423 loff_t offset,
1424 unsigned long nr_segs)
1425{
1426 struct inode *inode = iocb->ki_filp->f_mapping->host;
1427 struct block_device *bdev = xfs_find_bdev_for_inode(inode);
1428 struct xfs_ioend *ioend = NULL;
1429 ssize_t ret;
1430
1431 if (rw & WRITE) {
1432 size_t size = iov_length(iov, nr_segs);
1433
1434
1435
1436
1437
1438
1439
1440 iocb->private = ioend = xfs_alloc_ioend(inode, XFS_IO_DIRECT);
1441 if (offset + size > XFS_I(inode)->i_d.di_size) {
1442 ret = xfs_setfilesize_trans_alloc(ioend);
1443 if (ret)
1444 goto out_destroy_ioend;
1445 ioend->io_isdirect = 1;
1446 }
1447
1448 ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
1449 offset, nr_segs,
1450 xfs_get_blocks_direct,
1451 xfs_end_io_direct_write, NULL, 0);
1452 if (ret != -EIOCBQUEUED && iocb->private)
1453 goto out_trans_cancel;
1454 } else {
1455 ret = __blockdev_direct_IO(rw, iocb, inode, bdev, iov,
1456 offset, nr_segs,
1457 xfs_get_blocks_direct,
1458 NULL, NULL, 0);
1459 }
1460
1461 return ret;
1462
1463out_trans_cancel:
1464 if (ioend->io_append_trans) {
1465 current_set_flags_nested(&ioend->io_append_trans->t_pflags,
1466 PF_FSTRANS);
1467 rwsem_acquire_read(
1468 &inode->i_sb->s_writers.lock_map[SB_FREEZE_FS-1],
1469 0, 1, _THIS_IP_);
1470 xfs_trans_cancel(ioend->io_append_trans, 0);
1471 }
1472out_destroy_ioend:
1473 xfs_destroy_ioend(ioend);
1474 return ret;
1475}
1476
1477
1478
1479
1480
1481
1482
1483STATIC void
1484xfs_vm_kill_delalloc_range(
1485 struct inode *inode,
1486 loff_t start,
1487 loff_t end)
1488{
1489 struct xfs_inode *ip = XFS_I(inode);
1490 xfs_fileoff_t start_fsb;
1491 xfs_fileoff_t end_fsb;
1492 int error;
1493
1494 start_fsb = XFS_B_TO_FSB(ip->i_mount, start);
1495 end_fsb = XFS_B_TO_FSB(ip->i_mount, end);
1496 if (end_fsb <= start_fsb)
1497 return;
1498
1499 xfs_ilock(ip, XFS_ILOCK_EXCL);
1500 error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
1501 end_fsb - start_fsb);
1502 if (error) {
1503
1504 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
1505 xfs_alert(ip->i_mount,
1506 "xfs_vm_write_failed: unable to clean up ino %lld",
1507 ip->i_ino);
1508 }
1509 }
1510 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1511}
1512
1513STATIC void
1514xfs_vm_write_failed(
1515 struct inode *inode,
1516 struct page *page,
1517 loff_t pos,
1518 unsigned len)
1519{
1520 loff_t block_offset = pos & PAGE_MASK;
1521 loff_t block_start;
1522 loff_t block_end;
1523 loff_t from = pos & (PAGE_CACHE_SIZE - 1);
1524 loff_t to = from + len;
1525 struct buffer_head *bh, *head;
1526
1527 ASSERT(block_offset + from == pos);
1528
1529 head = page_buffers(page);
1530 block_start = 0;
1531 for (bh = head; bh != head || !block_start;
1532 bh = bh->b_this_page, block_start = block_end,
1533 block_offset += bh->b_size) {
1534 block_end = block_start + bh->b_size;
1535
1536
1537 if (block_end <= from)
1538 continue;
1539
1540
1541 if (block_start >= to)
1542 break;
1543
1544 if (!buffer_delay(bh))
1545 continue;
1546
1547 if (!buffer_new(bh) && block_offset < i_size_read(inode))
1548 continue;
1549
1550 xfs_vm_kill_delalloc_range(inode, block_offset,
1551 block_offset + bh->b_size);
1552 }
1553
1554}
1555
1556
1557
1558
1559
1560
1561
1562STATIC int
1563xfs_vm_write_begin(
1564 struct file *file,
1565 struct address_space *mapping,
1566 loff_t pos,
1567 unsigned len,
1568 unsigned flags,
1569 struct page **pagep,
1570 void **fsdata)
1571{
1572 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1573 struct page *page;
1574 int status;
1575
1576 ASSERT(len <= PAGE_CACHE_SIZE);
1577
1578 page = grab_cache_page_write_begin(mapping, index,
1579 flags | AOP_FLAG_NOFS);
1580 if (!page)
1581 return -ENOMEM;
1582
1583 status = __block_write_begin(page, pos, len, xfs_get_blocks);
1584 if (unlikely(status)) {
1585 struct inode *inode = mapping->host;
1586
1587 xfs_vm_write_failed(inode, page, pos, len);
1588 unlock_page(page);
1589
1590 if (pos + len > i_size_read(inode))
1591 truncate_pagecache(inode, pos + len, i_size_read(inode));
1592
1593 page_cache_release(page);
1594 page = NULL;
1595 }
1596
1597 *pagep = page;
1598 return status;
1599}
1600
1601
1602
1603
1604
1605
1606STATIC int
1607xfs_vm_write_end(
1608 struct file *file,
1609 struct address_space *mapping,
1610 loff_t pos,
1611 unsigned len,
1612 unsigned copied,
1613 struct page *page,
1614 void *fsdata)
1615{
1616 int ret;
1617
1618 ASSERT(len <= PAGE_CACHE_SIZE);
1619
1620 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
1621 if (unlikely(ret < len)) {
1622 struct inode *inode = mapping->host;
1623 size_t isize = i_size_read(inode);
1624 loff_t to = pos + len;
1625
1626 if (to > isize) {
1627 truncate_pagecache(inode, to, isize);
1628 xfs_vm_kill_delalloc_range(inode, isize, to);
1629 }
1630 }
1631 return ret;
1632}
1633
1634STATIC sector_t
1635xfs_vm_bmap(
1636 struct address_space *mapping,
1637 sector_t block)
1638{
1639 struct inode *inode = (struct inode *)mapping->host;
1640 struct xfs_inode *ip = XFS_I(inode);
1641
1642 trace_xfs_vm_bmap(XFS_I(inode));
1643 xfs_ilock(ip, XFS_IOLOCK_SHARED);
1644 xfs_flush_pages(ip, (xfs_off_t)0, -1, 0, FI_REMAPF);
1645 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
1646 return generic_block_bmap(mapping, block, xfs_get_blocks);
1647}
1648
1649STATIC int
1650xfs_vm_readpage(
1651 struct file *unused,
1652 struct page *page)
1653{
1654 return mpage_readpage(page, xfs_get_blocks);
1655}
1656
1657STATIC int
1658xfs_vm_readpages(
1659 struct file *unused,
1660 struct address_space *mapping,
1661 struct list_head *pages,
1662 unsigned nr_pages)
1663{
1664 return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks);
1665}
1666
1667const struct address_space_operations xfs_address_space_operations = {
1668 .readpage = xfs_vm_readpage,
1669 .readpages = xfs_vm_readpages,
1670 .writepage = xfs_vm_writepage,
1671 .writepages = xfs_vm_writepages,
1672 .releasepage = xfs_vm_releasepage,
1673 .invalidatepage = xfs_vm_invalidatepage,
1674 .write_begin = xfs_vm_write_begin,
1675 .write_end = xfs_vm_write_end,
1676 .bmap = xfs_vm_bmap,
1677 .direct_IO = xfs_vm_direct_IO,
1678 .migratepage = buffer_migrate_page,
1679 .is_partially_uptodate = block_is_partially_uptodate,
1680 .error_remove_page = generic_error_remove_page,
1681};
1682