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5
6
7#include <linux/sched.h>
8#include <linux/slab.h>
9#include <linux/spinlock.h>
10#include <linux/completion.h>
11#include <linux/buffer_head.h>
12#include <linux/pagemap.h>
13#include <linux/pagevec.h>
14#include <linux/mpage.h>
15#include <linux/fs.h>
16#include <linux/writeback.h>
17#include <linux/swap.h>
18#include <linux/gfs2_ondisk.h>
19#include <linux/backing-dev.h>
20#include <linux/uio.h>
21#include <trace/events/writeback.h>
22#include <linux/sched/signal.h>
23
24#include "gfs2.h"
25#include "incore.h"
26#include "bmap.h"
27#include "glock.h"
28#include "inode.h"
29#include "log.h"
30#include "meta_io.h"
31#include "quota.h"
32#include "trans.h"
33#include "rgrp.h"
34#include "super.h"
35#include "util.h"
36#include "glops.h"
37#include "aops.h"
38
39
40void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
41 unsigned int from, unsigned int len)
42{
43 struct buffer_head *head = page_buffers(page);
44 unsigned int bsize = head->b_size;
45 struct buffer_head *bh;
46 unsigned int to = from + len;
47 unsigned int start, end;
48
49 for (bh = head, start = 0; bh != head || !start;
50 bh = bh->b_this_page, start = end) {
51 end = start + bsize;
52 if (end <= from)
53 continue;
54 if (start >= to)
55 break;
56 set_buffer_uptodate(bh);
57 gfs2_trans_add_data(ip->i_gl, bh);
58 }
59}
60
61
62
63
64
65
66
67
68
69
70
71static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
72 struct buffer_head *bh_result, int create)
73{
74 int error;
75
76 error = gfs2_block_map(inode, lblock, bh_result, 0);
77 if (error)
78 return error;
79 if (!buffer_mapped(bh_result))
80 return -EIO;
81 return 0;
82}
83
84
85
86
87
88
89static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
90{
91 struct inode *inode = page->mapping->host;
92 struct gfs2_inode *ip = GFS2_I(inode);
93 struct gfs2_sbd *sdp = GFS2_SB(inode);
94 loff_t i_size = i_size_read(inode);
95 pgoff_t end_index = i_size >> PAGE_SHIFT;
96 unsigned offset;
97
98 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
99 goto out;
100 if (current->journal_info)
101 goto redirty;
102
103 offset = i_size & (PAGE_SIZE-1);
104 if (page->index > end_index || (page->index == end_index && !offset)) {
105 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
106 goto out;
107 }
108
109 return nobh_writepage(page, gfs2_get_block_noalloc, wbc);
110
111redirty:
112 redirty_page_for_writepage(wbc, page);
113out:
114 unlock_page(page);
115 return 0;
116}
117
118
119
120
121static int gfs2_write_full_page(struct page *page, get_block_t *get_block,
122 struct writeback_control *wbc)
123{
124 struct inode * const inode = page->mapping->host;
125 loff_t i_size = i_size_read(inode);
126 const pgoff_t end_index = i_size >> PAGE_SHIFT;
127 unsigned offset;
128
129
130
131
132
133
134
135
136 offset = i_size & (PAGE_SIZE - 1);
137 if (page->index == end_index && offset)
138 zero_user_segment(page, offset, PAGE_SIZE);
139
140 return __block_write_full_page(inode, page, get_block, wbc,
141 end_buffer_async_write);
142}
143
144
145
146
147
148
149
150
151
152
153
154
155static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
156{
157 struct inode *inode = page->mapping->host;
158 struct gfs2_inode *ip = GFS2_I(inode);
159 struct gfs2_sbd *sdp = GFS2_SB(inode);
160
161 if (PageChecked(page)) {
162 ClearPageChecked(page);
163 if (!page_has_buffers(page)) {
164 create_empty_buffers(page, inode->i_sb->s_blocksize,
165 BIT(BH_Dirty)|BIT(BH_Uptodate));
166 }
167 gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize);
168 }
169 return gfs2_write_full_page(page, gfs2_get_block_noalloc, wbc);
170}
171
172
173
174
175
176
177
178
179
180
181static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
182{
183 struct inode *inode = page->mapping->host;
184 struct gfs2_inode *ip = GFS2_I(inode);
185 struct gfs2_sbd *sdp = GFS2_SB(inode);
186
187 if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
188 goto out;
189 if (PageChecked(page) || current->journal_info)
190 goto out_ignore;
191 return __gfs2_jdata_writepage(page, wbc);
192
193out_ignore:
194 redirty_page_for_writepage(wbc, page);
195out:
196 unlock_page(page);
197 return 0;
198}
199
200
201
202
203
204
205
206
207static int gfs2_writepages(struct address_space *mapping,
208 struct writeback_control *wbc)
209{
210 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
211 int ret = mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
212
213
214
215
216
217
218
219 if (ret == 0)
220 set_bit(SDF_FORCE_AIL_FLUSH, &sdp->sd_flags);
221
222 return ret;
223}
224
225
226
227
228
229
230
231
232
233
234
235
236static int gfs2_write_jdata_pagevec(struct address_space *mapping,
237 struct writeback_control *wbc,
238 struct pagevec *pvec,
239 int nr_pages,
240 pgoff_t *done_index)
241{
242 struct inode *inode = mapping->host;
243 struct gfs2_sbd *sdp = GFS2_SB(inode);
244 unsigned nrblocks = nr_pages * (PAGE_SIZE >> inode->i_blkbits);
245 int i;
246 int ret;
247
248 ret = gfs2_trans_begin(sdp, nrblocks, nrblocks);
249 if (ret < 0)
250 return ret;
251
252 for(i = 0; i < nr_pages; i++) {
253 struct page *page = pvec->pages[i];
254
255 *done_index = page->index;
256
257 lock_page(page);
258
259 if (unlikely(page->mapping != mapping)) {
260continue_unlock:
261 unlock_page(page);
262 continue;
263 }
264
265 if (!PageDirty(page)) {
266
267 goto continue_unlock;
268 }
269
270 if (PageWriteback(page)) {
271 if (wbc->sync_mode != WB_SYNC_NONE)
272 wait_on_page_writeback(page);
273 else
274 goto continue_unlock;
275 }
276
277 BUG_ON(PageWriteback(page));
278 if (!clear_page_dirty_for_io(page))
279 goto continue_unlock;
280
281 trace_wbc_writepage(wbc, inode_to_bdi(inode));
282
283 ret = __gfs2_jdata_writepage(page, wbc);
284 if (unlikely(ret)) {
285 if (ret == AOP_WRITEPAGE_ACTIVATE) {
286 unlock_page(page);
287 ret = 0;
288 } else {
289
290
291
292
293
294
295
296
297
298
299 *done_index = page->index + 1;
300 ret = 1;
301 break;
302 }
303 }
304
305
306
307
308
309
310
311 if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) {
312 ret = 1;
313 break;
314 }
315
316 }
317 gfs2_trans_end(sdp);
318 return ret;
319}
320
321
322
323
324
325
326
327
328
329
330
331static int gfs2_write_cache_jdata(struct address_space *mapping,
332 struct writeback_control *wbc)
333{
334 int ret = 0;
335 int done = 0;
336 struct pagevec pvec;
337 int nr_pages;
338 pgoff_t writeback_index;
339 pgoff_t index;
340 pgoff_t end;
341 pgoff_t done_index;
342 int cycled;
343 int range_whole = 0;
344 xa_mark_t tag;
345
346 pagevec_init(&pvec);
347 if (wbc->range_cyclic) {
348 writeback_index = mapping->writeback_index;
349 index = writeback_index;
350 if (index == 0)
351 cycled = 1;
352 else
353 cycled = 0;
354 end = -1;
355 } else {
356 index = wbc->range_start >> PAGE_SHIFT;
357 end = wbc->range_end >> PAGE_SHIFT;
358 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
359 range_whole = 1;
360 cycled = 1;
361 }
362 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
363 tag = PAGECACHE_TAG_TOWRITE;
364 else
365 tag = PAGECACHE_TAG_DIRTY;
366
367retry:
368 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
369 tag_pages_for_writeback(mapping, index, end);
370 done_index = index;
371 while (!done && (index <= end)) {
372 nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
373 tag);
374 if (nr_pages == 0)
375 break;
376
377 ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, &done_index);
378 if (ret)
379 done = 1;
380 if (ret > 0)
381 ret = 0;
382 pagevec_release(&pvec);
383 cond_resched();
384 }
385
386 if (!cycled && !done) {
387
388
389
390
391
392 cycled = 1;
393 index = 0;
394 end = writeback_index - 1;
395 goto retry;
396 }
397
398 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
399 mapping->writeback_index = done_index;
400
401 return ret;
402}
403
404
405
406
407
408
409
410
411
412static int gfs2_jdata_writepages(struct address_space *mapping,
413 struct writeback_control *wbc)
414{
415 struct gfs2_inode *ip = GFS2_I(mapping->host);
416 struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
417 int ret;
418
419 ret = gfs2_write_cache_jdata(mapping, wbc);
420 if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
421 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
422 GFS2_LFC_JDATA_WPAGES);
423 ret = gfs2_write_cache_jdata(mapping, wbc);
424 }
425 return ret;
426}
427
428
429
430
431
432
433
434
435static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
436{
437 struct buffer_head *dibh;
438 u64 dsize = i_size_read(&ip->i_inode);
439 void *kaddr;
440 int error;
441
442
443
444
445
446
447 if (unlikely(page->index)) {
448 zero_user(page, 0, PAGE_SIZE);
449 SetPageUptodate(page);
450 return 0;
451 }
452
453 error = gfs2_meta_inode_buffer(ip, &dibh);
454 if (error)
455 return error;
456
457 kaddr = kmap_atomic(page);
458 if (dsize > gfs2_max_stuffed_size(ip))
459 dsize = gfs2_max_stuffed_size(ip);
460 memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
461 memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
462 kunmap_atomic(kaddr);
463 flush_dcache_page(page);
464 brelse(dibh);
465 SetPageUptodate(page);
466
467 return 0;
468}
469
470
471static int __gfs2_readpage(void *file, struct page *page)
472{
473 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
474 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
475 int error;
476
477 if (i_blocksize(page->mapping->host) == PAGE_SIZE &&
478 !page_has_buffers(page)) {
479 error = iomap_readpage(page, &gfs2_iomap_ops);
480 } else if (gfs2_is_stuffed(ip)) {
481 error = stuffed_readpage(ip, page);
482 unlock_page(page);
483 } else {
484 error = mpage_readpage(page, gfs2_block_map);
485 }
486
487 if (unlikely(gfs2_withdrawn(sdp)))
488 return -EIO;
489
490 return error;
491}
492
493
494
495
496
497
498
499static int gfs2_readpage(struct file *file, struct page *page)
500{
501 return __gfs2_readpage(file, page);
502}
503
504
505
506
507
508
509
510
511
512
513int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos,
514 unsigned size)
515{
516 struct address_space *mapping = ip->i_inode.i_mapping;
517 unsigned long index = *pos >> PAGE_SHIFT;
518 unsigned offset = *pos & (PAGE_SIZE - 1);
519 unsigned copied = 0;
520 unsigned amt;
521 struct page *page;
522 void *p;
523
524 do {
525 amt = size - copied;
526 if (offset + size > PAGE_SIZE)
527 amt = PAGE_SIZE - offset;
528 page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
529 if (IS_ERR(page))
530 return PTR_ERR(page);
531 p = kmap_atomic(page);
532 memcpy(buf + copied, p + offset, amt);
533 kunmap_atomic(p);
534 put_page(page);
535 copied += amt;
536 index++;
537 offset = 0;
538 } while(copied < size);
539 (*pos) += size;
540 return size;
541}
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561static void gfs2_readahead(struct readahead_control *rac)
562{
563 struct inode *inode = rac->mapping->host;
564 struct gfs2_inode *ip = GFS2_I(inode);
565
566 if (!gfs2_is_stuffed(ip))
567 mpage_readahead(rac, gfs2_block_map);
568}
569
570
571
572
573
574void adjust_fs_space(struct inode *inode)
575{
576 struct gfs2_sbd *sdp = GFS2_SB(inode);
577 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
578 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
579 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
580 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
581 struct buffer_head *m_bh, *l_bh;
582 u64 fs_total, new_free;
583
584 if (gfs2_trans_begin(sdp, 2 * RES_STATFS, 0) != 0)
585 return;
586
587
588 fs_total = gfs2_ri_total(sdp);
589 if (gfs2_meta_inode_buffer(m_ip, &m_bh) != 0)
590 goto out;
591
592 spin_lock(&sdp->sd_statfs_spin);
593 gfs2_statfs_change_in(m_sc, m_bh->b_data +
594 sizeof(struct gfs2_dinode));
595 if (fs_total > (m_sc->sc_total + l_sc->sc_total))
596 new_free = fs_total - (m_sc->sc_total + l_sc->sc_total);
597 else
598 new_free = 0;
599 spin_unlock(&sdp->sd_statfs_spin);
600 fs_warn(sdp, "File system extended by %llu blocks.\n",
601 (unsigned long long)new_free);
602 gfs2_statfs_change(sdp, new_free, new_free, 0);
603
604 if (gfs2_meta_inode_buffer(l_ip, &l_bh) != 0)
605 goto out2;
606 update_statfs(sdp, m_bh, l_bh);
607 brelse(l_bh);
608out2:
609 brelse(m_bh);
610out:
611 sdp->sd_rindex_uptodate = 0;
612 gfs2_trans_end(sdp);
613}
614
615
616
617
618
619
620
621
622static int jdata_set_page_dirty(struct page *page)
623{
624 SetPageChecked(page);
625 return __set_page_dirty_buffers(page);
626}
627
628
629
630
631
632
633
634
635
636static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
637{
638 struct gfs2_inode *ip = GFS2_I(mapping->host);
639 struct gfs2_holder i_gh;
640 sector_t dblock = 0;
641 int error;
642
643 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
644 if (error)
645 return 0;
646
647 if (!gfs2_is_stuffed(ip))
648 dblock = iomap_bmap(mapping, lblock, &gfs2_iomap_ops);
649
650 gfs2_glock_dq_uninit(&i_gh);
651
652 return dblock;
653}
654
655static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
656{
657 struct gfs2_bufdata *bd;
658
659 lock_buffer(bh);
660 gfs2_log_lock(sdp);
661 clear_buffer_dirty(bh);
662 bd = bh->b_private;
663 if (bd) {
664 if (!list_empty(&bd->bd_list) && !buffer_pinned(bh))
665 list_del_init(&bd->bd_list);
666 else
667 gfs2_remove_from_journal(bh, REMOVE_JDATA);
668 }
669 bh->b_bdev = NULL;
670 clear_buffer_mapped(bh);
671 clear_buffer_req(bh);
672 clear_buffer_new(bh);
673 gfs2_log_unlock(sdp);
674 unlock_buffer(bh);
675}
676
677static void gfs2_invalidatepage(struct page *page, unsigned int offset,
678 unsigned int length)
679{
680 struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
681 unsigned int stop = offset + length;
682 int partial_page = (offset || length < PAGE_SIZE);
683 struct buffer_head *bh, *head;
684 unsigned long pos = 0;
685
686 BUG_ON(!PageLocked(page));
687 if (!partial_page)
688 ClearPageChecked(page);
689 if (!page_has_buffers(page))
690 goto out;
691
692 bh = head = page_buffers(page);
693 do {
694 if (pos + bh->b_size > stop)
695 return;
696
697 if (offset <= pos)
698 gfs2_discard(sdp, bh);
699 pos += bh->b_size;
700 bh = bh->b_this_page;
701 } while (bh != head);
702out:
703 if (!partial_page)
704 try_to_release_page(page, 0);
705}
706
707
708
709
710
711
712
713
714
715
716
717
718int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
719{
720 struct address_space *mapping = page->mapping;
721 struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
722 struct buffer_head *bh, *head;
723 struct gfs2_bufdata *bd;
724
725 if (!page_has_buffers(page))
726 return 0;
727
728
729
730
731
732
733
734
735
736
737
738 gfs2_log_lock(sdp);
739 spin_lock(&sdp->sd_ail_lock);
740 head = bh = page_buffers(page);
741 do {
742 if (atomic_read(&bh->b_count))
743 goto cannot_release;
744 bd = bh->b_private;
745 if (bd && bd->bd_tr)
746 goto cannot_release;
747 if (buffer_dirty(bh) || WARN_ON(buffer_pinned(bh)))
748 goto cannot_release;
749 bh = bh->b_this_page;
750 } while(bh != head);
751 spin_unlock(&sdp->sd_ail_lock);
752
753 head = bh = page_buffers(page);
754 do {
755 bd = bh->b_private;
756 if (bd) {
757 gfs2_assert_warn(sdp, bd->bd_bh == bh);
758 bd->bd_bh = NULL;
759 bh->b_private = NULL;
760
761
762
763
764 if (!bd->bd_blkno && !list_empty(&bd->bd_list))
765 list_del_init(&bd->bd_list);
766 if (list_empty(&bd->bd_list))
767 kmem_cache_free(gfs2_bufdata_cachep, bd);
768 }
769
770 bh = bh->b_this_page;
771 } while (bh != head);
772 gfs2_log_unlock(sdp);
773
774 return try_to_free_buffers(page);
775
776cannot_release:
777 spin_unlock(&sdp->sd_ail_lock);
778 gfs2_log_unlock(sdp);
779 return 0;
780}
781
782static const struct address_space_operations gfs2_aops = {
783 .writepage = gfs2_writepage,
784 .writepages = gfs2_writepages,
785 .readpage = gfs2_readpage,
786 .readahead = gfs2_readahead,
787 .bmap = gfs2_bmap,
788 .invalidatepage = gfs2_invalidatepage,
789 .releasepage = gfs2_releasepage,
790 .direct_IO = noop_direct_IO,
791 .migratepage = buffer_migrate_page,
792 .is_partially_uptodate = block_is_partially_uptodate,
793 .error_remove_page = generic_error_remove_page,
794};
795
796static const struct address_space_operations gfs2_jdata_aops = {
797 .writepage = gfs2_jdata_writepage,
798 .writepages = gfs2_jdata_writepages,
799 .readpage = gfs2_readpage,
800 .readahead = gfs2_readahead,
801 .set_page_dirty = jdata_set_page_dirty,
802 .bmap = gfs2_bmap,
803 .invalidatepage = gfs2_invalidatepage,
804 .releasepage = gfs2_releasepage,
805 .is_partially_uptodate = block_is_partially_uptodate,
806 .error_remove_page = generic_error_remove_page,
807};
808
809void gfs2_set_aops(struct inode *inode)
810{
811 if (gfs2_is_jdata(GFS2_I(inode)))
812 inode->i_mapping->a_ops = &gfs2_jdata_aops;
813 else
814 inode->i_mapping->a_ops = &gfs2_aops;
815}
816