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10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/pagemap.h>
16#include <linux/pagevec.h>
17#include <linux/mpage.h>
18#include <linux/fs.h>
19#include <linux/writeback.h>
20#include <linux/swap.h>
21#include <linux/gfs2_ondisk.h>
22#include <linux/backing-dev.h>
23#include <linux/uio.h>
24#include <trace/events/writeback.h>
25
26#include "gfs2.h"
27#include "incore.h"
28#include "bmap.h"
29#include "glock.h"
30#include "inode.h"
31#include "log.h"
32#include "meta_io.h"
33#include "quota.h"
34#include "trans.h"
35#include "rgrp.h"
36#include "super.h"
37#include "util.h"
38#include "glops.h"
39
40
41static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
42 unsigned int from, unsigned int len)
43{
44 struct buffer_head *head = page_buffers(page);
45 unsigned int bsize = head->b_size;
46 struct buffer_head *bh;
47 unsigned int to = from + len;
48 unsigned int start, end;
49
50 for (bh = head, start = 0; bh != head || !start;
51 bh = bh->b_this_page, start = end) {
52 end = start + bsize;
53 if (end <= from)
54 continue;
55 if (start >= to)
56 break;
57 if (gfs2_is_jdata(ip))
58 set_buffer_uptodate(bh);
59 gfs2_trans_add_data(ip->i_gl, bh);
60 }
61}
62
63
64
65
66
67
68
69
70
71
72
73static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
74 struct buffer_head *bh_result, int create)
75{
76 int error;
77
78 error = gfs2_block_map(inode, lblock, bh_result, 0);
79 if (error)
80 return error;
81 if (!buffer_mapped(bh_result))
82 return -EIO;
83 return 0;
84}
85
86static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
87 struct buffer_head *bh_result, int create)
88{
89 return gfs2_block_map(inode, lblock, bh_result, 0);
90}
91
92
93
94
95
96
97
98
99
100static int gfs2_writepage_common(struct page *page,
101 struct writeback_control *wbc)
102{
103 struct inode *inode = page->mapping->host;
104 struct gfs2_inode *ip = GFS2_I(inode);
105 struct gfs2_sbd *sdp = GFS2_SB(inode);
106 loff_t i_size = i_size_read(inode);
107 pgoff_t end_index = i_size >> PAGE_SHIFT;
108 unsigned offset;
109
110 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
111 goto out;
112 if (current->journal_info)
113 goto redirty;
114
115 offset = i_size & (PAGE_SIZE-1);
116 if (page->index > end_index || (page->index == end_index && !offset)) {
117 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
118 goto out;
119 }
120 return 1;
121redirty:
122 redirty_page_for_writepage(wbc, page);
123out:
124 unlock_page(page);
125 return 0;
126}
127
128
129
130
131
132
133
134
135static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
136{
137 int ret;
138
139 ret = gfs2_writepage_common(page, wbc);
140 if (ret <= 0)
141 return ret;
142
143 return nobh_writepage(page, gfs2_get_block_noalloc, wbc);
144}
145
146
147
148
149static int gfs2_write_full_page(struct page *page, get_block_t *get_block,
150 struct writeback_control *wbc)
151{
152 struct inode * const inode = page->mapping->host;
153 loff_t i_size = i_size_read(inode);
154 const pgoff_t end_index = i_size >> PAGE_SHIFT;
155 unsigned offset;
156
157
158
159
160
161
162
163
164 offset = i_size & (PAGE_SIZE-1);
165 if (page->index == end_index && offset)
166 zero_user_segment(page, offset, PAGE_SIZE);
167
168 return __block_write_full_page(inode, page, get_block, wbc,
169 end_buffer_async_write);
170}
171
172
173
174
175
176
177
178
179
180
181
182
183static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
184{
185 struct inode *inode = page->mapping->host;
186 struct gfs2_inode *ip = GFS2_I(inode);
187 struct gfs2_sbd *sdp = GFS2_SB(inode);
188
189 if (PageChecked(page)) {
190 ClearPageChecked(page);
191 if (!page_has_buffers(page)) {
192 create_empty_buffers(page, inode->i_sb->s_blocksize,
193 BIT(BH_Dirty)|BIT(BH_Uptodate));
194 }
195 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize);
196 }
197 return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc);
198}
199
200
201
202
203
204
205
206
207
208
209static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
210{
211 struct inode *inode = page->mapping->host;
212 struct gfs2_inode *ip = GFS2_I(inode);
213 struct gfs2_sbd *sdp = GFS2_SB(inode);
214 int ret;
215
216 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
217 goto out;
218 if (PageChecked(page) || current->journal_info)
219 goto out_ignore;
220 ret = __gfs2_jdata_writepage(page, wbc);
221 return ret;
222
223out_ignore:
224 redirty_page_for_writepage(wbc, page);
225out:
226 unlock_page(page);
227 return 0;
228}
229
230
231
232
233
234
235
236
237static int gfs2_writepages(struct address_space *mapping,
238 struct writeback_control *wbc)
239{
240 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
241 int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
242
243
244
245
246
247
248
249 if (ret == 0)
250 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
251
252 return ret;
253}
254
255
256
257
258
259
260
261
262
263
264
265
266static int gfs2_write_jdata_pagevec(struct address_space *mapping,
267 struct writeback_control *wbc,
268 struct pagevec *pvec,
269 int nr_pages,
270 pgoff_t *done_index)
271{
272 struct inode *inode = mapping->host;
273 struct gfs2_sbd *sdp = GFS2_SB(inode);
274 unsigned nrblocks = nr_pages * (PAGE_SIZE/inode->i_sb->s_blocksize);
275 int i;
276 int ret;
277
278 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
279 if (ret < 0)
280 return ret;
281
282 for(i = 0; i < nr_pages; i++) {
283 struct page *page = pvec->pages[i];
284
285 *done_index = page->index;
286
287 lock_page(page);
288
289 if (unlikely(page->mapping != mapping)) {
290continue_unlock:
291 unlock_page(page);
292 continue;
293 }
294
295 if (!PageDirty(page)) {
296
297 goto continue_unlock;
298 }
299
300 if (PageWriteback(page)) {
301 if (wbc->sync_mode != WB_SYNC_NONE)
302 wait_on_page_writeback(page);
303 else
304 goto continue_unlock;
305 }
306
307 BUG_ON(PageWriteback(page));
308 if (!clear_page_dirty_for_io(page))
309 goto continue_unlock;
310
311 trace_wbc_writepage(wbc, inode_to_bdi(inode));
312
313 ret = __gfs2_jdata_writepage(page, wbc);
314 if (unlikely(ret)) {
315 if (ret == AOP_WRITEPAGE_ACTIVATE) {
316 unlock_page(page);
317 ret = 0;
318 } else {
319
320
321
322
323
324
325
326
327
328
329 *done_index = page->index + 1;
330 ret = 1;
331 break;
332 }
333 }
334
335
336
337
338
339
340
341 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
342 ret = 1;
343 break;
344 }
345
346 }
347 gfs2_trans_end(sdp);
348 return ret;
349}
350
351
352
353
354
355
356
357
358
359
360
361static int gfs2_write_cache_jdata(struct address_space *mapping,
362 struct writeback_control *wbc)
363{
364 int ret = 0;
365 int done = 0;
366 struct pagevec pvec;
367 int nr_pages;
368 pgoff_t uninitialized_var(writeback_index);
369 pgoff_t index;
370 pgoff_t end;
371 pgoff_t done_index;
372 int cycled;
373 int range_whole = 0;
374 int tag;
375
376 pagevec_init(&pvec);
377 if (wbc->range_cyclic) {
378 writeback_index = mapping->writeback_index;
379 index = writeback_index;
380 if (index == 0)
381 cycled = 1;
382 else
383 cycled = 0;
384 end = -1;
385 } else {
386 index = wbc->range_start >> PAGE_SHIFT;
387 end = wbc->range_end >> PAGE_SHIFT;
388 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
389 range_whole = 1;
390 cycled = 1;
391 }
392 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
393 tag = PAGECACHE_TAG_TOWRITE;
394 else
395 tag = PAGECACHE_TAG_DIRTY;
396
397retry:
398 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
399 tag_pages_for_writeback(mapping, index, end);
400 done_index = index;
401 while (!done && (index <= end)) {
402 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
403 tag);
404 if (nr_pages == 0)
405 break;
406
407 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index);
408 if (ret)
409 done = 1;
410 if (ret > 0)
411 ret = 0;
412 pagevec_release(&pvec);
413 cond_resched();
414 }
415
416 if (!cycled && !done) {
417
418
419
420
421
422 cycled = 1;
423 index = 0;
424 end = writeback_index - 1;
425 goto retry;
426 }
427
428 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
429 mapping->writeback_index = done_index;
430
431 return ret;
432}
433
434
435
436
437
438
439
440
441
442static int gfs2_jdata_writepages(struct address_space *mapping,
443 struct writeback_control *wbc)
444{
445 struct gfs2_inode *ip = GFS2_I(mapping->host);
446 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
447 int ret;
448
449 ret = gfs2_write_cache_jdata(mapping, wbc);
450 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
451 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
452 GFS2_LFC_JDATA_WPAGES);
453 ret = gfs2_write_cache_jdata(mapping, wbc);
454 }
455 return ret;
456}
457
458
459
460
461
462
463
464
465
466static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
467{
468 struct buffer_head *dibh;
469 u64 dsize = i_size_read(&ip->i_inode);
470 void *kaddr;
471 int error;
472
473
474
475
476
477
478 if (unlikely(page->index)) {
479 zero_user(page, 0, PAGE_SIZE);
480 SetPageUptodate(page);
481 return 0;
482 }
483
484 error = gfs2_meta_inode_buffer(ip, &dibh);
485 if (error)
486 return error;
487
488 kaddr = kmap_atomic(page);
489 if (dsize > gfs2_max_stuffed_size(ip))
490 dsize = gfs2_max_stuffed_size(ip);
491 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
492 memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
493 kunmap_atomic(kaddr);
494 flush_dcache_page(page);
495 brelse(dibh);
496 SetPageUptodate(page);
497
498 return 0;
499}
500
501
502
503
504
505
506
507
508
509
510
511
512static int __gfs2_readpage(void *file, struct page *page)
513{
514 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
515 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
516 int error;
517
518 if (gfs2_is_stuffed(ip)) {
519 error = stuffed_readpage(ip, page);
520 unlock_page(page);
521 } else {
522 error = mpage_readpage(page, gfs2_block_map);
523 }
524
525 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
526 return -EIO;
527
528 return error;
529}
530
531
532
533
534
535
536
537
538
539
540
541static int gfs2_readpage(struct file *file, struct page *page)
542{
543 struct address_space *mapping = page->mapping;
544 struct gfs2_inode *ip = GFS2_I(mapping->host);
545 struct gfs2_holder gh;
546 int error;
547
548 unlock_page(page);
549 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
550 error = gfs2_glock_nq(&gh);
551 if (unlikely(error))
552 goto out;
553 error = AOP_TRUNCATED_PAGE;
554 lock_page(page);
555 if (page->mapping == mapping && !PageUptodate(page))
556 error = __gfs2_readpage(file, page);
557 else
558 unlock_page(page);
559 gfs2_glock_dq(&gh);
560out:
561 gfs2_holder_uninit(&gh);
562 if (error && error != AOP_TRUNCATED_PAGE)
563 lock_page(page);
564 return error;
565}
566
567
568
569
570
571
572
573
574
575
576int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
577 unsigned size)
578{
579 struct address_space *mapping = ip->i_inode.i_mapping;
580 unsigned long index = *pos / PAGE_SIZE;
581 unsigned offset = *pos & (PAGE_SIZE - 1);
582 unsigned copied = 0;
583 unsigned amt;
584 struct page *page;
585 void *p;
586
587 do {
588 amt = size - copied;
589 if (offset + size > PAGE_SIZE)
590 amt = PAGE_SIZE - offset;
591 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
592 if (IS_ERR(page))
593 return PTR_ERR(page);
594 p = kmap_atomic(page);
595 memcpy(buf + copied, p + offset, amt);
596 kunmap_atomic(p);
597 put_page(page);
598 copied += amt;
599 index++;
600 offset = 0;
601 } while(copied < size);
602 (*pos) += size;
603 return size;
604}
605
606
607
608
609
610
611
612
613
614
615
616
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618
619
620
621
622
623
624static int gfs2_readpages(struct file *file, struct address_space *mapping,
625 struct list_head *pages, unsigned nr_pages)
626{
627 struct inode *inode = mapping->host;
628 struct gfs2_inode *ip = GFS2_I(inode);
629 struct gfs2_sbd *sdp = GFS2_SB(inode);
630 struct gfs2_holder gh;
631 int ret;
632
633 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
634 ret = gfs2_glock_nq(&gh);
635 if (unlikely(ret))
636 goto out_uninit;
637 if (!gfs2_is_stuffed(ip))
638 ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
639 gfs2_glock_dq(&gh);
640out_uninit:
641 gfs2_holder_uninit(&gh);
642 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
643 ret = -EIO;
644 return ret;
645}
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660static int gfs2_write_begin(struct file *file, struct address_space *mapping,
661 loff_t pos, unsigned len, unsigned flags,
662 struct page **pagep, void **fsdata)
663{
664 struct gfs2_inode *ip = GFS2_I(mapping->host);
665 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
666 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
667 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
668 unsigned requested = 0;
669 int alloc_required;
670 int error = 0;
671 pgoff_t index = pos >> PAGE_SHIFT;
672 unsigned from = pos & (PAGE_SIZE - 1);
673 struct page *page;
674
675 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
676 error = gfs2_glock_nq(&ip->i_gh);
677 if (unlikely(error))
678 goto out_uninit;
679 if (&ip->i_inode == sdp->sd_rindex) {
680 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
681 GL_NOCACHE, &m_ip->i_gh);
682 if (unlikely(error)) {
683 gfs2_glock_dq(&ip->i_gh);
684 goto out_uninit;
685 }
686 }
687
688 alloc_required = gfs2_write_alloc_required(ip, pos, len);
689
690 if (alloc_required || gfs2_is_jdata(ip))
691 gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
692
693 if (alloc_required) {
694 struct gfs2_alloc_parms ap = { .aflags = 0, };
695 requested = data_blocks + ind_blocks;
696 ap.target = requested;
697 error = gfs2_quota_lock_check(ip, &ap);
698 if (error)
699 goto out_unlock;
700
701 error = gfs2_inplace_reserve(ip, &ap);
702 if (error)
703 goto out_qunlock;
704 }
705
706 rblocks = RES_DINODE + ind_blocks;
707 if (gfs2_is_jdata(ip))
708 rblocks += data_blocks ? data_blocks : 1;
709 if (ind_blocks || data_blocks)
710 rblocks += RES_STATFS + RES_QUOTA;
711 if (&ip->i_inode == sdp->sd_rindex)
712 rblocks += 2 * RES_STATFS;
713 if (alloc_required)
714 rblocks += gfs2_rg_blocks(ip, requested);
715
716 error = gfs2_trans_begin(sdp, rblocks,
717 PAGE_SIZE/sdp->sd_sb.sb_bsize);
718 if (error)
719 goto out_trans_fail;
720
721 error = -ENOMEM;
722 flags |= AOP_FLAG_NOFS;
723 page = grab_cache_page_write_begin(mapping, index, flags);
724 *pagep = page;
725 if (unlikely(!page))
726 goto out_endtrans;
727
728 if (gfs2_is_stuffed(ip)) {
729 error = 0;
730 if (pos + len > gfs2_max_stuffed_size(ip)) {
731 error = gfs2_unstuff_dinode(ip, page);
732 if (error == 0)
733 goto prepare_write;
734 } else if (!PageUptodate(page)) {
735 error = stuffed_readpage(ip, page);
736 }
737 goto out;
738 }
739
740prepare_write:
741 error = __block_write_begin(page, from, len, gfs2_block_map);
742out:
743 if (error == 0)
744 return 0;
745
746 unlock_page(page);
747 put_page(page);
748
749 gfs2_trans_end(sdp);
750 if (pos + len > ip->i_inode.i_size)
751 gfs2_trim_blocks(&ip->i_inode);
752 goto out_trans_fail;
753
754out_endtrans:
755 gfs2_trans_end(sdp);
756out_trans_fail:
757 if (alloc_required) {
758 gfs2_inplace_release(ip);
759out_qunlock:
760 gfs2_quota_unlock(ip);
761 }
762out_unlock:
763 if (&ip->i_inode == sdp->sd_rindex) {
764 gfs2_glock_dq(&m_ip->i_gh);
765 gfs2_holder_uninit(&m_ip->i_gh);
766 }
767 gfs2_glock_dq(&ip->i_gh);
768out_uninit:
769 gfs2_holder_uninit(&ip->i_gh);
770 return error;
771}
772
773
774
775
776
777static void adjust_fs_space(struct inode *inode)
778{
779 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
780 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
781 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
782 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
783 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
784 struct buffer_head *m_bh, *l_bh;
785 u64 fs_total, new_free;
786
787
788 fs_total = gfs2_ri_total(sdp);
789 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
790 return;
791
792 spin_lock(&sdp->sd_statfs_spin);
793 gfs2_statfs_change_in(m_sc, m_bh->b_data +
794 sizeof(struct gfs2_dinode));
795 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
796 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
797 else
798 new_free = 0;
799 spin_unlock(&sdp->sd_statfs_spin);
800 fs_warn(sdp, "File system extended by %llu blocks.\n",
801 (unsigned long long)new_free);
802 gfs2_statfs_change(sdp, new_free, new_free, 0);
803
804 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
805 goto out;
806 update_statfs(sdp, m_bh, l_bh);
807 brelse(l_bh);
808out:
809 brelse(m_bh);
810}
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
827 loff_t pos, unsigned len, unsigned copied,
828 struct page *page)
829{
830 struct gfs2_inode *ip = GFS2_I(inode);
831 struct gfs2_sbd *sdp = GFS2_SB(inode);
832 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
833 u64 to = pos + copied;
834 void *kaddr;
835 unsigned char *buf = dibh->b_data + sizeof(struct gfs2_dinode);
836
837 BUG_ON(pos + len > gfs2_max_stuffed_size(ip));
838
839 kaddr = kmap_atomic(page);
840 memcpy(buf + pos, kaddr + pos, copied);
841 flush_dcache_page(page);
842 kunmap_atomic(kaddr);
843
844 WARN_ON(!PageUptodate(page));
845 unlock_page(page);
846 put_page(page);
847
848 if (copied) {
849 if (inode->i_size < to)
850 i_size_write(inode, to);
851 mark_inode_dirty(inode);
852 }
853
854 if (inode == sdp->sd_rindex) {
855 adjust_fs_space(inode);
856 sdp->sd_rindex_uptodate = 0;
857 }
858
859 brelse(dibh);
860 gfs2_trans_end(sdp);
861 if (inode == sdp->sd_rindex) {
862 gfs2_glock_dq(&m_ip->i_gh);
863 gfs2_holder_uninit(&m_ip->i_gh);
864 }
865 gfs2_glock_dq(&ip->i_gh);
866 gfs2_holder_uninit(&ip->i_gh);
867 return copied;
868}
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887static int gfs2_write_end(struct file *file, struct address_space *mapping,
888 loff_t pos, unsigned len, unsigned copied,
889 struct page *page, void *fsdata)
890{
891 struct inode *inode = page->mapping->host;
892 struct gfs2_inode *ip = GFS2_I(inode);
893 struct gfs2_sbd *sdp = GFS2_SB(inode);
894 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
895 struct buffer_head *dibh;
896 int ret;
897 struct gfs2_trans *tr = current->journal_info;
898 BUG_ON(!tr);
899
900 BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
901
902 ret = gfs2_meta_inode_buffer(ip, &dibh);
903 if (unlikely(ret)) {
904 unlock_page(page);
905 put_page(page);
906 goto failed;
907 }
908
909 if (gfs2_is_stuffed(ip))
910 return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
911
912 if (!gfs2_is_writeback(ip))
913 gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len);
914
915 ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
916 if (tr->tr_num_buf_new)
917 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
918 else
919 gfs2_trans_add_meta(ip->i_gl, dibh);
920
921
922 if (inode == sdp->sd_rindex) {
923 adjust_fs_space(inode);
924 sdp->sd_rindex_uptodate = 0;
925 }
926
927 brelse(dibh);
928failed:
929 gfs2_trans_end(sdp);
930 gfs2_inplace_release(ip);
931 if (ip->i_qadata && ip->i_qadata->qa_qd_num)
932 gfs2_quota_unlock(ip);
933 if (inode == sdp->sd_rindex) {
934 gfs2_glock_dq(&m_ip->i_gh);
935 gfs2_holder_uninit(&m_ip->i_gh);
936 }
937 gfs2_glock_dq(&ip->i_gh);
938 gfs2_holder_uninit(&ip->i_gh);
939 return ret;
940}
941
942
943
944
945
946
947
948
949static int jdata_set_page_dirty(struct page *page)
950{
951 SetPageChecked(page);
952 return __set_page_dirty_buffers(page);
953}
954
955
956
957
958
959
960
961
962
963static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
964{
965 struct gfs2_inode *ip = GFS2_I(mapping->host);
966 struct gfs2_holder i_gh;
967 sector_t dblock = 0;
968 int error;
969
970 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
971 if (error)
972 return 0;
973
974 if (!gfs2_is_stuffed(ip))
975 dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
976
977 gfs2_glock_dq_uninit(&i_gh);
978
979 return dblock;
980}
981
982static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
983{
984 struct gfs2_bufdata *bd;
985
986 lock_buffer(bh);
987 gfs2_log_lock(sdp);
988 clear_buffer_dirty(bh);
989 bd = bh->b_private;
990 if (bd) {
991 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
992 list_del_init(&bd->bd_list);
993 else
994 gfs2_remove_from_journal(bh, REMOVE_JDATA);
995 }
996 bh->b_bdev = NULL;
997 clear_buffer_mapped(bh);
998 clear_buffer_req(bh);
999 clear_buffer_new(bh);
1000 gfs2_log_unlock(sdp);
1001 unlock_buffer(bh);
1002}
1003
1004static void gfs2_invalidatepage(struct page *page, unsigned int offset,
1005 unsigned int length)
1006{
1007 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
1008 unsigned int stop = offset + length;
1009 int partial_page = (offset || length < PAGE_SIZE);
1010 struct buffer_head *bh, *head;
1011 unsigned long pos = 0;
1012
1013 BUG_ON(!PageLocked(page));
1014 if (!partial_page)
1015 ClearPageChecked(page);
1016 if (!page_has_buffers(page))
1017 goto out;
1018
1019 bh = head = page_buffers(page);
1020 do {
1021 if (pos + bh->b_size > stop)
1022 return;
1023
1024 if (offset <= pos)
1025 gfs2_discard(sdp, bh);
1026 pos += bh->b_size;
1027 bh = bh->b_this_page;
1028 } while (bh != head);
1029out:
1030 if (!partial_page)
1031 try_to_release_page(page, 0);
1032}
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset)
1043{
1044
1045
1046
1047
1048
1049 if (gfs2_is_stuffed(ip))
1050 return 0;
1051
1052 if (offset >= i_size_read(&ip->i_inode))
1053 return 0;
1054 return 1;
1055}
1056
1057
1058
1059static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
1060{
1061 struct file *file = iocb->ki_filp;
1062 struct inode *inode = file->f_mapping->host;
1063 struct address_space *mapping = inode->i_mapping;
1064 struct gfs2_inode *ip = GFS2_I(inode);
1065 loff_t offset = iocb->ki_pos;
1066 struct gfs2_holder gh;
1067 int rv;
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
1078 rv = gfs2_glock_nq(&gh);
1079 if (rv)
1080 goto out_uninit;
1081 rv = gfs2_ok_for_dio(ip, offset);
1082 if (rv != 1)
1083 goto out;
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098 if (mapping->nrpages) {
1099 loff_t lstart = offset & ~(PAGE_SIZE - 1);
1100 loff_t len = iov_iter_count(iter);
1101 loff_t end = PAGE_ALIGN(offset + len) - 1;
1102
1103 rv = 0;
1104 if (len == 0)
1105 goto out;
1106 if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
1107 unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
1108 rv = filemap_write_and_wait_range(mapping, lstart, end);
1109 if (rv)
1110 goto out;
1111 if (iov_iter_rw(iter) == WRITE)
1112 truncate_inode_pages_range(mapping, lstart, end);
1113 }
1114
1115 rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
1116 gfs2_get_block_direct, NULL, NULL, 0);
1117out:
1118 gfs2_glock_dq(&gh);
1119out_uninit:
1120 gfs2_holder_uninit(&gh);
1121 return rv;
1122}
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
1136{
1137 struct address_space *mapping = page->mapping;
1138 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
1139 struct buffer_head *bh, *head;
1140 struct gfs2_bufdata *bd;
1141
1142 if (!page_has_buffers(page))
1143 return 0;
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155 gfs2_log_lock(sdp);
1156 spin_lock(&sdp->sd_ail_lock);
1157 head = bh = page_buffers(page);
1158 do {
1159 if (atomic_read(&bh->b_count))
1160 goto cannot_release;
1161 bd = bh->b_private;
1162 if (bd && bd->bd_tr)
1163 goto cannot_release;
1164 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
1165 goto cannot_release;
1166 bh = bh->b_this_page;
1167 } while(bh != head);
1168 spin_unlock(&sdp->sd_ail_lock);
1169
1170 head = bh = page_buffers(page);
1171 do {
1172 bd = bh->b_private;
1173 if (bd) {
1174 gfs2_assert_warn(sdp, bd->bd_bh == bh);
1175 if (!list_empty(&bd->bd_list))
1176 list_del_init(&bd->bd_list);
1177 bd->bd_bh = NULL;
1178 bh->b_private = NULL;
1179 kmem_cache_free(gfs2_bufdata_cachep, bd);
1180 }
1181
1182 bh = bh->b_this_page;
1183 } while (bh != head);
1184 gfs2_log_unlock(sdp);
1185
1186 return try_to_free_buffers(page);
1187
1188cannot_release:
1189 spin_unlock(&sdp->sd_ail_lock);
1190 gfs2_log_unlock(sdp);
1191 return 0;
1192}
1193
1194static const struct address_space_operations gfs2_writeback_aops = {
1195 .writepage = gfs2_writepage,
1196 .writepages = gfs2_writepages,
1197 .readpage = gfs2_readpage,
1198 .readpages = gfs2_readpages,
1199 .write_begin = gfs2_write_begin,
1200 .write_end = gfs2_write_end,
1201 .bmap = gfs2_bmap,
1202 .invalidatepage = gfs2_invalidatepage,
1203 .releasepage = gfs2_releasepage,
1204 .direct_IO = gfs2_direct_IO,
1205 .migratepage = buffer_migrate_page,
1206 .is_partially_uptodate = block_is_partially_uptodate,
1207 .error_remove_page = generic_error_remove_page,
1208};
1209
1210static const struct address_space_operations gfs2_ordered_aops = {
1211 .writepage = gfs2_writepage,
1212 .writepages = gfs2_writepages,
1213 .readpage = gfs2_readpage,
1214 .readpages = gfs2_readpages,
1215 .write_begin = gfs2_write_begin,
1216 .write_end = gfs2_write_end,
1217 .set_page_dirty = __set_page_dirty_buffers,
1218 .bmap = gfs2_bmap,
1219 .invalidatepage = gfs2_invalidatepage,
1220 .releasepage = gfs2_releasepage,
1221 .direct_IO = gfs2_direct_IO,
1222 .migratepage = buffer_migrate_page,
1223 .is_partially_uptodate = block_is_partially_uptodate,
1224 .error_remove_page = generic_error_remove_page,
1225};
1226
1227static const struct address_space_operations gfs2_jdata_aops = {
1228 .writepage = gfs2_jdata_writepage,
1229 .writepages = gfs2_jdata_writepages,
1230 .readpage = gfs2_readpage,
1231 .readpages = gfs2_readpages,
1232 .write_begin = gfs2_write_begin,
1233 .write_end = gfs2_write_end,
1234 .set_page_dirty = jdata_set_page_dirty,
1235 .bmap = gfs2_bmap,
1236 .invalidatepage = gfs2_invalidatepage,
1237 .releasepage = gfs2_releasepage,
1238 .is_partially_uptodate = block_is_partially_uptodate,
1239 .error_remove_page = generic_error_remove_page,
1240};
1241
1242void gfs2_set_aops(struct inode *inode)
1243{
1244 struct gfs2_inode *ip = GFS2_I(inode);
1245
1246 if (gfs2_is_writeback(ip))
1247 inode->i_mapping->a_ops = &gfs2_writeback_aops;
1248 else if (gfs2_is_ordered(ip))
1249 inode->i_mapping->a_ops = &gfs2_ordered_aops;
1250 else if (gfs2_is_jdata(ip))
1251 inode->i_mapping->a_ops = &gfs2_jdata_aops;
1252 else
1253 BUG();
1254}
1255
1256