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7
8
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/file.h>
14#include <linux/writeback.h>
15#include <linux/swap.h>
16#include <linux/migrate.h>
17
18#include <linux/sunrpc/clnt.h>
19#include <linux/nfs_fs.h>
20#include <linux/nfs_mount.h>
21#include <linux/nfs_page.h>
22#include <linux/backing-dev.h>
23#include <linux/export.h>
24#include <linux/freezer.h>
25#include <linux/wait.h>
26#include <linux/iversion.h>
27
28#include <linux/uaccess.h>
29#include <linux/sched/mm.h>
30
31#include "delegation.h"
32#include "internal.h"
33#include "iostat.h"
34#include "nfs4_fs.h"
35#include "fscache.h"
36#include "pnfs.h"
37
38#include "nfstrace.h"
39
40#define NFSDBG_FACILITY NFSDBG_PAGECACHE
41
42#define MIN_POOL_WRITE (32)
43#define MIN_POOL_COMMIT (4)
44
45struct nfs_io_completion {
46 void (*complete)(void *data);
47 void *data;
48 struct kref refcount;
49};
50
51
52
53
54static void nfs_redirty_request(struct nfs_page *req);
55static const struct rpc_call_ops nfs_commit_ops;
56static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
57static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
58static const struct nfs_rw_ops nfs_rw_write_ops;
59static void nfs_clear_request_commit(struct nfs_page *req);
60static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
61 struct inode *inode);
62static struct nfs_page *
63nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
64 struct page *page);
65
66static struct kmem_cache *nfs_wdata_cachep;
67static mempool_t *nfs_wdata_mempool;
68static struct kmem_cache *nfs_cdata_cachep;
69static mempool_t *nfs_commit_mempool;
70
71struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail)
72{
73 struct nfs_commit_data *p;
74
75 if (never_fail)
76 p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
77 else {
78
79
80
81
82
83 p = mempool_alloc(nfs_commit_mempool, GFP_NOWAIT);
84 if (!p)
85 p = kmem_cache_alloc(nfs_cdata_cachep, GFP_NOIO |
86 __GFP_NOWARN | __GFP_NORETRY);
87 if (!p)
88 return NULL;
89 }
90
91 memset(p, 0, sizeof(*p));
92 INIT_LIST_HEAD(&p->pages);
93 return p;
94}
95EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
96
97void nfs_commit_free(struct nfs_commit_data *p)
98{
99 mempool_free(p, nfs_commit_mempool);
100}
101EXPORT_SYMBOL_GPL(nfs_commit_free);
102
103static struct nfs_pgio_header *nfs_writehdr_alloc(void)
104{
105 struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
106
107 memset(p, 0, sizeof(*p));
108 p->rw_mode = FMODE_WRITE;
109 return p;
110}
111
112static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
113{
114 mempool_free(hdr, nfs_wdata_mempool);
115}
116
117static struct nfs_io_completion *nfs_io_completion_alloc(gfp_t gfp_flags)
118{
119 return kmalloc(sizeof(struct nfs_io_completion), gfp_flags);
120}
121
122static void nfs_io_completion_init(struct nfs_io_completion *ioc,
123 void (*complete)(void *), void *data)
124{
125 ioc->complete = complete;
126 ioc->data = data;
127 kref_init(&ioc->refcount);
128}
129
130static void nfs_io_completion_release(struct kref *kref)
131{
132 struct nfs_io_completion *ioc = container_of(kref,
133 struct nfs_io_completion, refcount);
134 ioc->complete(ioc->data);
135 kfree(ioc);
136}
137
138static void nfs_io_completion_get(struct nfs_io_completion *ioc)
139{
140 if (ioc != NULL)
141 kref_get(&ioc->refcount);
142}
143
144static void nfs_io_completion_put(struct nfs_io_completion *ioc)
145{
146 if (ioc != NULL)
147 kref_put(&ioc->refcount, nfs_io_completion_release);
148}
149
150static struct nfs_page *
151nfs_page_private_request(struct page *page)
152{
153 if (!PagePrivate(page))
154 return NULL;
155 return (struct nfs_page *)page_private(page);
156}
157
158
159
160
161
162
163
164
165static struct nfs_page *
166nfs_page_find_private_request(struct page *page)
167{
168 struct address_space *mapping = page_file_mapping(page);
169 struct nfs_page *req;
170
171 if (!PagePrivate(page))
172 return NULL;
173 spin_lock(&mapping->private_lock);
174 req = nfs_page_private_request(page);
175 if (req) {
176 WARN_ON_ONCE(req->wb_head != req);
177 kref_get(&req->wb_kref);
178 }
179 spin_unlock(&mapping->private_lock);
180 return req;
181}
182
183static struct nfs_page *
184nfs_page_find_swap_request(struct page *page)
185{
186 struct inode *inode = page_file_mapping(page)->host;
187 struct nfs_inode *nfsi = NFS_I(inode);
188 struct nfs_page *req = NULL;
189 if (!PageSwapCache(page))
190 return NULL;
191 mutex_lock(&nfsi->commit_mutex);
192 if (PageSwapCache(page)) {
193 req = nfs_page_search_commits_for_head_request_locked(nfsi,
194 page);
195 if (req) {
196 WARN_ON_ONCE(req->wb_head != req);
197 kref_get(&req->wb_kref);
198 }
199 }
200 mutex_unlock(&nfsi->commit_mutex);
201 return req;
202}
203
204
205
206
207
208
209static struct nfs_page *nfs_page_find_head_request(struct page *page)
210{
211 struct nfs_page *req;
212
213 req = nfs_page_find_private_request(page);
214 if (!req)
215 req = nfs_page_find_swap_request(page);
216 return req;
217}
218
219
220static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
221{
222 struct inode *inode = page_file_mapping(page)->host;
223 loff_t end, i_size;
224 pgoff_t end_index;
225
226 spin_lock(&inode->i_lock);
227 i_size = i_size_read(inode);
228 end_index = (i_size - 1) >> PAGE_SHIFT;
229 if (i_size > 0 && page_index(page) < end_index)
230 goto out;
231 end = page_file_offset(page) + ((loff_t)offset+count);
232 if (i_size >= end)
233 goto out;
234 i_size_write(inode, end);
235 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
236 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
237out:
238 spin_unlock(&inode->i_lock);
239}
240
241
242static void nfs_set_pageerror(struct address_space *mapping)
243{
244 nfs_zap_mapping(mapping->host, mapping);
245}
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260static struct nfs_page *
261nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
262{
263 struct nfs_page *req;
264
265 req = head;
266 do {
267 if (page_offset >= req->wb_pgbase &&
268 page_offset < (req->wb_pgbase + req->wb_bytes))
269 return req;
270
271 req = req->wb_this_page;
272 } while (req != head);
273
274 return NULL;
275}
276
277
278
279
280
281
282
283
284static bool nfs_page_group_covers_page(struct nfs_page *req)
285{
286 struct nfs_page *tmp;
287 unsigned int pos = 0;
288 unsigned int len = nfs_page_length(req->wb_page);
289
290 nfs_page_group_lock(req);
291
292 for (;;) {
293 tmp = nfs_page_group_search_locked(req->wb_head, pos);
294 if (!tmp)
295 break;
296 pos = tmp->wb_pgbase + tmp->wb_bytes;
297 }
298
299 nfs_page_group_unlock(req);
300 return pos >= len;
301}
302
303
304
305
306static void nfs_mark_uptodate(struct nfs_page *req)
307{
308 if (PageUptodate(req->wb_page))
309 return;
310 if (!nfs_page_group_covers_page(req))
311 return;
312 SetPageUptodate(req->wb_page);
313}
314
315static int wb_priority(struct writeback_control *wbc)
316{
317 int ret = 0;
318
319 if (wbc->sync_mode == WB_SYNC_ALL)
320 ret = FLUSH_COND_STABLE;
321 return ret;
322}
323
324
325
326
327
328int nfs_congestion_kb;
329
330#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
331#define NFS_CONGESTION_OFF_THRESH \
332 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
333
334static void nfs_set_page_writeback(struct page *page)
335{
336 struct inode *inode = page_file_mapping(page)->host;
337 struct nfs_server *nfss = NFS_SERVER(inode);
338 int ret = test_set_page_writeback(page);
339
340 WARN_ON_ONCE(ret != 0);
341
342 if (atomic_long_inc_return(&nfss->writeback) >
343 NFS_CONGESTION_ON_THRESH)
344 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
345}
346
347static void nfs_end_page_writeback(struct nfs_page *req)
348{
349 struct inode *inode = page_file_mapping(req->wb_page)->host;
350 struct nfs_server *nfss = NFS_SERVER(inode);
351 bool is_done;
352
353 is_done = nfs_page_group_sync_on_bit(req, PG_WB_END);
354 nfs_unlock_request(req);
355 if (!is_done)
356 return;
357
358 end_page_writeback(req->wb_page);
359 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
360 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
361}
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377static void
378nfs_unroll_locks(struct inode *inode, struct nfs_page *head,
379 struct nfs_page *req)
380{
381 struct nfs_page *tmp;
382
383
384 for (tmp = head->wb_this_page ; tmp != req; tmp = tmp->wb_this_page) {
385 if (!kref_read(&tmp->wb_kref))
386 continue;
387 nfs_unlock_and_release_request(tmp);
388 }
389}
390
391
392
393
394
395
396
397
398
399
400
401static void
402nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
403 struct nfs_page *old_head,
404 struct inode *inode)
405{
406 while (destroy_list) {
407 struct nfs_page *subreq = destroy_list;
408
409 destroy_list = (subreq->wb_this_page == old_head) ?
410 NULL : subreq->wb_this_page;
411
412 WARN_ON_ONCE(old_head != subreq->wb_head);
413
414
415 subreq->wb_this_page = subreq;
416
417 clear_bit(PG_REMOVE, &subreq->wb_flags);
418
419
420 if (!kref_read(&subreq->wb_kref)) {
421
422 if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags))
423 nfs_free_request(subreq);
424 continue;
425 }
426
427 subreq->wb_head = subreq;
428
429 if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) {
430 nfs_release_request(subreq);
431 atomic_long_dec(&NFS_I(inode)->nrequests);
432 }
433
434
435
436 nfs_unlock_and_release_request(subreq);
437 }
438}
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458static struct nfs_page *
459nfs_lock_and_join_requests(struct page *page)
460{
461 struct inode *inode = page_file_mapping(page)->host;
462 struct nfs_page *head, *subreq;
463 struct nfs_page *destroy_list = NULL;
464 unsigned int total_bytes;
465 int ret;
466
467try_again:
468
469
470
471
472
473 head = nfs_page_find_head_request(page);
474 if (!head)
475 return NULL;
476
477
478 if (!nfs_lock_request(head)) {
479 ret = nfs_wait_on_request(head);
480 nfs_release_request(head);
481 if (ret < 0)
482 return ERR_PTR(ret);
483 goto try_again;
484 }
485
486
487 if (head != nfs_page_private_request(page) && !PageSwapCache(page)) {
488 nfs_unlock_and_release_request(head);
489 goto try_again;
490 }
491
492 ret = nfs_page_group_lock(head);
493 if (ret < 0)
494 goto release_request;
495
496
497 total_bytes = head->wb_bytes;
498 for (subreq = head->wb_this_page; subreq != head;
499 subreq = subreq->wb_this_page) {
500
501 if (!kref_get_unless_zero(&subreq->wb_kref)) {
502 if (subreq->wb_offset == head->wb_offset + total_bytes)
503 total_bytes += subreq->wb_bytes;
504 continue;
505 }
506
507 while (!nfs_lock_request(subreq)) {
508
509
510
511
512 nfs_page_group_unlock(head);
513 ret = nfs_wait_on_request(subreq);
514 if (!ret)
515 ret = nfs_page_group_lock(head);
516 if (ret < 0) {
517 nfs_unroll_locks(inode, head, subreq);
518 nfs_release_request(subreq);
519 goto release_request;
520 }
521 }
522
523
524
525
526 if (subreq->wb_offset == (head->wb_offset + total_bytes)) {
527
528 total_bytes += subreq->wb_bytes;
529 } else if (WARN_ON_ONCE(subreq->wb_offset < head->wb_offset ||
530 ((subreq->wb_offset + subreq->wb_bytes) >
531 (head->wb_offset + total_bytes)))) {
532 nfs_page_group_unlock(head);
533 nfs_unroll_locks(inode, head, subreq);
534 nfs_unlock_and_release_request(subreq);
535 ret = -EIO;
536 goto release_request;
537 }
538 }
539
540
541
542 subreq = head;
543 do {
544 nfs_clear_request_commit(subreq);
545 subreq = subreq->wb_this_page;
546 } while (subreq != head);
547
548
549 if (head->wb_this_page != head) {
550
551 destroy_list = head->wb_this_page;
552 head->wb_this_page = head;
553
554
555
556 head->wb_bytes = total_bytes;
557 }
558
559
560 if (test_and_clear_bit(PG_REMOVE, &head->wb_flags)) {
561 set_bit(PG_INODE_REF, &head->wb_flags);
562 kref_get(&head->wb_kref);
563 atomic_long_inc(&NFS_I(inode)->nrequests);
564 }
565
566 nfs_page_group_unlock(head);
567
568 nfs_destroy_unlinked_subrequests(destroy_list, head, inode);
569
570
571 if (!(PagePrivate(page) || PageSwapCache(page))) {
572 nfs_unlock_and_release_request(head);
573 return NULL;
574 }
575
576
577
578 return head;
579
580release_request:
581 nfs_unlock_and_release_request(head);
582 return ERR_PTR(ret);
583}
584
585static void nfs_write_error_remove_page(struct nfs_page *req)
586{
587 nfs_end_page_writeback(req);
588 generic_error_remove_page(page_file_mapping(req->wb_page),
589 req->wb_page);
590 nfs_release_request(req);
591}
592
593static bool
594nfs_error_is_fatal_on_server(int err)
595{
596 switch (err) {
597 case 0:
598 case -ERESTARTSYS:
599 case -EINTR:
600 return false;
601 }
602 return nfs_error_is_fatal(err);
603}
604
605
606
607
608
609static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
610 struct page *page)
611{
612 struct nfs_page *req;
613 int ret = 0;
614
615 req = nfs_lock_and_join_requests(page);
616 if (!req)
617 goto out;
618 ret = PTR_ERR(req);
619 if (IS_ERR(req))
620 goto out;
621
622 nfs_set_page_writeback(page);
623 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
624
625 ret = req->wb_context->error;
626
627 if (nfs_error_is_fatal_on_server(ret))
628 goto out_launder;
629
630 ret = 0;
631 if (!nfs_pageio_add_request(pgio, req)) {
632 ret = pgio->pg_error;
633
634
635
636 if (nfs_error_is_fatal(ret)) {
637 nfs_context_set_write_error(req->wb_context, ret);
638 if (nfs_error_is_fatal_on_server(ret))
639 goto out_launder;
640 } else
641 ret = -EAGAIN;
642 nfs_redirty_request(req);
643 } else
644 nfs_add_stats(page_file_mapping(page)->host,
645 NFSIOS_WRITEPAGES, 1);
646out:
647 return ret;
648out_launder:
649 nfs_write_error_remove_page(req);
650 return ret;
651}
652
653static int nfs_do_writepage(struct page *page, struct writeback_control *wbc,
654 struct nfs_pageio_descriptor *pgio)
655{
656 int ret;
657
658 nfs_pageio_cond_complete(pgio, page_index(page));
659 ret = nfs_page_async_flush(pgio, page);
660 if (ret == -EAGAIN) {
661 redirty_page_for_writepage(wbc, page);
662 ret = 0;
663 }
664 return ret;
665}
666
667
668
669
670static int nfs_writepage_locked(struct page *page,
671 struct writeback_control *wbc)
672{
673 struct nfs_pageio_descriptor pgio;
674 struct inode *inode = page_file_mapping(page)->host;
675 int err;
676
677 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
678 nfs_pageio_init_write(&pgio, inode, 0,
679 false, &nfs_async_write_completion_ops);
680 err = nfs_do_writepage(page, wbc, &pgio);
681 nfs_pageio_complete(&pgio);
682 if (err < 0)
683 return err;
684 if (pgio.pg_error < 0)
685 return pgio.pg_error;
686 return 0;
687}
688
689int nfs_writepage(struct page *page, struct writeback_control *wbc)
690{
691 int ret;
692
693 ret = nfs_writepage_locked(page, wbc);
694 unlock_page(page);
695 return ret;
696}
697
698static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
699{
700 int ret;
701
702 ret = nfs_do_writepage(page, wbc, data);
703 unlock_page(page);
704 return ret;
705}
706
707static void nfs_io_completion_commit(void *inode)
708{
709 nfs_commit_inode(inode, 0);
710}
711
712int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
713{
714 struct inode *inode = mapping->host;
715 struct nfs_pageio_descriptor pgio;
716 struct nfs_io_completion *ioc;
717 unsigned int pflags = memalloc_nofs_save();
718 int err;
719
720 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
721
722 ioc = nfs_io_completion_alloc(GFP_NOFS);
723 if (ioc)
724 nfs_io_completion_init(ioc, nfs_io_completion_commit, inode);
725
726 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
727 &nfs_async_write_completion_ops);
728 pgio.pg_io_completion = ioc;
729 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
730 nfs_pageio_complete(&pgio);
731 nfs_io_completion_put(ioc);
732
733 memalloc_nofs_restore(pflags);
734
735 if (err < 0)
736 goto out_err;
737 err = pgio.pg_error;
738 if (err < 0)
739 goto out_err;
740 return 0;
741out_err:
742 return err;
743}
744
745
746
747
748static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
749{
750 struct address_space *mapping = page_file_mapping(req->wb_page);
751 struct nfs_inode *nfsi = NFS_I(inode);
752
753 WARN_ON_ONCE(req->wb_this_page != req);
754
755
756 nfs_lock_request(req);
757
758
759
760
761
762 spin_lock(&mapping->private_lock);
763 if (!nfs_have_writebacks(inode) &&
764 NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
765 inode_inc_iversion_raw(inode);
766 if (likely(!PageSwapCache(req->wb_page))) {
767 set_bit(PG_MAPPED, &req->wb_flags);
768 SetPagePrivate(req->wb_page);
769 set_page_private(req->wb_page, (unsigned long)req);
770 }
771 spin_unlock(&mapping->private_lock);
772 atomic_long_inc(&nfsi->nrequests);
773
774
775
776
777 WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
778 kref_get(&req->wb_kref);
779}
780
781
782
783
784static void nfs_inode_remove_request(struct nfs_page *req)
785{
786 struct address_space *mapping = page_file_mapping(req->wb_page);
787 struct inode *inode = mapping->host;
788 struct nfs_inode *nfsi = NFS_I(inode);
789 struct nfs_page *head;
790
791 atomic_long_dec(&nfsi->nrequests);
792 if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
793 head = req->wb_head;
794
795 spin_lock(&mapping->private_lock);
796 if (likely(head->wb_page && !PageSwapCache(head->wb_page))) {
797 set_page_private(head->wb_page, 0);
798 ClearPagePrivate(head->wb_page);
799 clear_bit(PG_MAPPED, &head->wb_flags);
800 }
801 spin_unlock(&mapping->private_lock);
802 }
803
804 if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
805 nfs_release_request(req);
806}
807
808static void
809nfs_mark_request_dirty(struct nfs_page *req)
810{
811 if (req->wb_page)
812 __set_page_dirty_nobuffers(req->wb_page);
813}
814
815
816
817
818
819
820
821
822
823static struct nfs_page *
824nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
825 struct page *page)
826{
827 struct nfs_page *freq, *t;
828 struct nfs_commit_info cinfo;
829 struct inode *inode = &nfsi->vfs_inode;
830
831 nfs_init_cinfo_from_inode(&cinfo, inode);
832
833
834 freq = pnfs_search_commit_reqs(inode, &cinfo, page);
835 if (freq)
836 return freq->wb_head;
837
838
839 list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) {
840 if (freq->wb_page == page)
841 return freq->wb_head;
842 }
843
844 return NULL;
845}
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860void
861nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst,
862 struct nfs_commit_info *cinfo)
863{
864 set_bit(PG_CLEAN, &req->wb_flags);
865 nfs_list_add_request(req, dst);
866 atomic_long_inc(&cinfo->mds->ncommit);
867}
868EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked);
869
870
871
872
873
874
875
876
877
878
879
880
881
882void
883nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo)
884{
885 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
886 nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo);
887 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
888 if (req->wb_page)
889 nfs_mark_page_unstable(req->wb_page, cinfo);
890}
891EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
892
893
894
895
896
897
898
899
900
901
902
903
904void
905nfs_request_remove_commit_list(struct nfs_page *req,
906 struct nfs_commit_info *cinfo)
907{
908 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
909 return;
910 nfs_list_remove_request(req);
911 atomic_long_dec(&cinfo->mds->ncommit);
912}
913EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
914
915static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
916 struct inode *inode)
917{
918 cinfo->inode = inode;
919 cinfo->mds = &NFS_I(inode)->commit_info;
920 cinfo->ds = pnfs_get_ds_info(inode);
921 cinfo->dreq = NULL;
922 cinfo->completion_ops = &nfs_commit_completion_ops;
923}
924
925void nfs_init_cinfo(struct nfs_commit_info *cinfo,
926 struct inode *inode,
927 struct nfs_direct_req *dreq)
928{
929 if (dreq)
930 nfs_init_cinfo_from_dreq(cinfo, dreq);
931 else
932 nfs_init_cinfo_from_inode(cinfo, inode);
933}
934EXPORT_SYMBOL_GPL(nfs_init_cinfo);
935
936
937
938
939void
940nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
941 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
942{
943 if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx))
944 return;
945 nfs_request_add_commit_list(req, cinfo);
946}
947
948static void
949nfs_clear_page_commit(struct page *page)
950{
951 dec_node_page_state(page, NR_UNSTABLE_NFS);
952 dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
953 WB_RECLAIMABLE);
954}
955
956
957static void
958nfs_clear_request_commit(struct nfs_page *req)
959{
960 if (test_bit(PG_CLEAN, &req->wb_flags)) {
961 struct inode *inode = d_inode(req->wb_context->dentry);
962 struct nfs_commit_info cinfo;
963
964 nfs_init_cinfo_from_inode(&cinfo, inode);
965 mutex_lock(&NFS_I(inode)->commit_mutex);
966 if (!pnfs_clear_request_commit(req, &cinfo)) {
967 nfs_request_remove_commit_list(req, &cinfo);
968 }
969 mutex_unlock(&NFS_I(inode)->commit_mutex);
970 nfs_clear_page_commit(req->wb_page);
971 }
972}
973
974int nfs_write_need_commit(struct nfs_pgio_header *hdr)
975{
976 if (hdr->verf.committed == NFS_DATA_SYNC)
977 return hdr->lseg == NULL;
978 return hdr->verf.committed != NFS_FILE_SYNC;
979}
980
981static void nfs_async_write_init(struct nfs_pgio_header *hdr)
982{
983 nfs_io_completion_get(hdr->io_completion);
984}
985
986static void nfs_write_completion(struct nfs_pgio_header *hdr)
987{
988 struct nfs_commit_info cinfo;
989 unsigned long bytes = 0;
990
991 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
992 goto out;
993 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
994 while (!list_empty(&hdr->pages)) {
995 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
996
997 bytes += req->wb_bytes;
998 nfs_list_remove_request(req);
999 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
1000 (hdr->good_bytes < bytes)) {
1001 nfs_set_pageerror(page_file_mapping(req->wb_page));
1002 nfs_context_set_write_error(req->wb_context, hdr->error);
1003 goto remove_req;
1004 }
1005 if (nfs_write_need_commit(hdr)) {
1006 memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
1007 nfs_mark_request_commit(req, hdr->lseg, &cinfo,
1008 hdr->pgio_mirror_idx);
1009 goto next;
1010 }
1011remove_req:
1012 nfs_inode_remove_request(req);
1013next:
1014 nfs_end_page_writeback(req);
1015 nfs_release_request(req);
1016 }
1017out:
1018 nfs_io_completion_put(hdr->io_completion);
1019 hdr->release(hdr);
1020}
1021
1022unsigned long
1023nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
1024{
1025 return atomic_long_read(&cinfo->mds->ncommit);
1026}
1027
1028
1029int
1030nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
1031 struct nfs_commit_info *cinfo, int max)
1032{
1033 struct nfs_page *req, *tmp;
1034 int ret = 0;
1035
1036restart:
1037 list_for_each_entry_safe(req, tmp, src, wb_list) {
1038 kref_get(&req->wb_kref);
1039 if (!nfs_lock_request(req)) {
1040 int status;
1041
1042
1043 if (!list_empty(dst)) {
1044 nfs_release_request(req);
1045 continue;
1046 }
1047
1048 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1049 status = nfs_wait_on_request(req);
1050 nfs_release_request(req);
1051 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1052 if (status < 0)
1053 break;
1054 goto restart;
1055 }
1056 nfs_request_remove_commit_list(req, cinfo);
1057 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1058 nfs_list_add_request(req, dst);
1059 ret++;
1060 if ((ret == max) && !cinfo->dreq)
1061 break;
1062 cond_resched();
1063 }
1064 return ret;
1065}
1066EXPORT_SYMBOL_GPL(nfs_scan_commit_list);
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077int
1078nfs_scan_commit(struct inode *inode, struct list_head *dst,
1079 struct nfs_commit_info *cinfo)
1080{
1081 int ret = 0;
1082
1083 if (!atomic_long_read(&cinfo->mds->ncommit))
1084 return 0;
1085 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1086 if (atomic_long_read(&cinfo->mds->ncommit) > 0) {
1087 const int max = INT_MAX;
1088
1089 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
1090 cinfo, max);
1091 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
1092 }
1093 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1094 return ret;
1095}
1096
1097
1098
1099
1100
1101
1102
1103
1104static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
1105 struct page *page,
1106 unsigned int offset,
1107 unsigned int bytes)
1108{
1109 struct nfs_page *req;
1110 unsigned int rqend;
1111 unsigned int end;
1112 int error;
1113
1114 end = offset + bytes;
1115
1116 req = nfs_lock_and_join_requests(page);
1117 if (IS_ERR_OR_NULL(req))
1118 return req;
1119
1120 rqend = req->wb_offset + req->wb_bytes;
1121
1122
1123
1124
1125
1126
1127 if (offset > rqend || end < req->wb_offset)
1128 goto out_flushme;
1129
1130
1131 if (offset < req->wb_offset) {
1132 req->wb_offset = offset;
1133 req->wb_pgbase = offset;
1134 }
1135 if (end > rqend)
1136 req->wb_bytes = end - req->wb_offset;
1137 else
1138 req->wb_bytes = rqend - req->wb_offset;
1139 return req;
1140out_flushme:
1141
1142
1143
1144
1145
1146 nfs_mark_request_dirty(req);
1147 nfs_unlock_and_release_request(req);
1148 error = nfs_wb_page(inode, page);
1149 return (error < 0) ? ERR_PTR(error) : NULL;
1150}
1151
1152
1153
1154
1155
1156
1157
1158
1159static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
1160 struct page *page, unsigned int offset, unsigned int bytes)
1161{
1162 struct inode *inode = page_file_mapping(page)->host;
1163 struct nfs_page *req;
1164
1165 req = nfs_try_to_update_request(inode, page, offset, bytes);
1166 if (req != NULL)
1167 goto out;
1168 req = nfs_create_request(ctx, page, NULL, offset, bytes);
1169 if (IS_ERR(req))
1170 goto out;
1171 nfs_inode_add_request(inode, req);
1172out:
1173 return req;
1174}
1175
1176static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
1177 unsigned int offset, unsigned int count)
1178{
1179 struct nfs_page *req;
1180
1181 req = nfs_setup_write_request(ctx, page, offset, count);
1182 if (IS_ERR(req))
1183 return PTR_ERR(req);
1184
1185 nfs_grow_file(page, offset, count);
1186 nfs_mark_uptodate(req);
1187 nfs_mark_request_dirty(req);
1188 nfs_unlock_and_release_request(req);
1189 return 0;
1190}
1191
1192int nfs_flush_incompatible(struct file *file, struct page *page)
1193{
1194 struct nfs_open_context *ctx = nfs_file_open_context(file);
1195 struct nfs_lock_context *l_ctx;
1196 struct file_lock_context *flctx = file_inode(file)->i_flctx;
1197 struct nfs_page *req;
1198 int do_flush, status;
1199
1200
1201
1202
1203
1204
1205
1206
1207 do {
1208 req = nfs_page_find_head_request(page);
1209 if (req == NULL)
1210 return 0;
1211 l_ctx = req->wb_lock_context;
1212 do_flush = req->wb_page != page ||
1213 !nfs_match_open_context(req->wb_context, ctx);
1214 if (l_ctx && flctx &&
1215 !(list_empty_careful(&flctx->flc_posix) &&
1216 list_empty_careful(&flctx->flc_flock))) {
1217 do_flush |= l_ctx->lockowner != current->files;
1218 }
1219 nfs_release_request(req);
1220 if (!do_flush)
1221 return 0;
1222 status = nfs_wb_page(page_file_mapping(page)->host, page);
1223 } while (status == 0);
1224 return status;
1225}
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237int
1238nfs_key_timeout_notify(struct file *filp, struct inode *inode)
1239{
1240 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1241
1242 if (nfs_ctx_key_to_expire(ctx, inode) &&
1243 !ctx->ll_cred)
1244
1245 return -EACCES;
1246 return 0;
1247}
1248
1249
1250
1251
1252bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode)
1253{
1254 struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;
1255 struct rpc_cred *cred = ctx->ll_cred;
1256 struct auth_cred acred = {
1257 .cred = ctx->cred,
1258 };
1259
1260 if (cred && !cred->cr_ops->crmatch(&acred, cred, 0)) {
1261 put_rpccred(cred);
1262 ctx->ll_cred = NULL;
1263 cred = NULL;
1264 }
1265 if (!cred)
1266 cred = auth->au_ops->lookup_cred(auth, &acred, 0);
1267 if (!cred || IS_ERR(cred))
1268 return true;
1269 ctx->ll_cred = cred;
1270 return !!(cred->cr_ops->crkey_timeout &&
1271 cred->cr_ops->crkey_timeout(cred));
1272}
1273
1274
1275
1276
1277
1278
1279static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
1280{
1281 struct nfs_inode *nfsi = NFS_I(inode);
1282
1283 if (nfs_have_delegated_attributes(inode))
1284 goto out;
1285 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
1286 return false;
1287 smp_rmb();
1288 if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags))
1289 return false;
1290out:
1291 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1292 return false;
1293 return PageUptodate(page) != 0;
1294}
1295
1296static bool
1297is_whole_file_wrlock(struct file_lock *fl)
1298{
1299 return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX &&
1300 fl->fl_type == F_WRLCK;
1301}
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
1312{
1313 int ret;
1314 struct file_lock_context *flctx = inode->i_flctx;
1315 struct file_lock *fl;
1316
1317 if (file->f_flags & O_DSYNC)
1318 return 0;
1319 if (!nfs_write_pageuptodate(page, inode))
1320 return 0;
1321 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
1322 return 1;
1323 if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
1324 list_empty_careful(&flctx->flc_posix)))
1325 return 1;
1326
1327
1328 ret = 0;
1329 spin_lock(&flctx->flc_lock);
1330 if (!list_empty(&flctx->flc_posix)) {
1331 fl = list_first_entry(&flctx->flc_posix, struct file_lock,
1332 fl_list);
1333 if (is_whole_file_wrlock(fl))
1334 ret = 1;
1335 } else if (!list_empty(&flctx->flc_flock)) {
1336 fl = list_first_entry(&flctx->flc_flock, struct file_lock,
1337 fl_list);
1338 if (fl->fl_type == F_WRLCK)
1339 ret = 1;
1340 }
1341 spin_unlock(&flctx->flc_lock);
1342 return ret;
1343}
1344
1345
1346
1347
1348
1349
1350
1351int nfs_updatepage(struct file *file, struct page *page,
1352 unsigned int offset, unsigned int count)
1353{
1354 struct nfs_open_context *ctx = nfs_file_open_context(file);
1355 struct address_space *mapping = page_file_mapping(page);
1356 struct inode *inode = mapping->host;
1357 int status = 0;
1358
1359 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
1360
1361 dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
1362 file, count, (long long)(page_file_offset(page) + offset));
1363
1364 if (!count)
1365 goto out;
1366
1367 if (nfs_can_extend_write(file, page, inode)) {
1368 count = max(count + offset, nfs_page_length(page));
1369 offset = 0;
1370 }
1371
1372 status = nfs_writepage_setup(ctx, page, offset, count);
1373 if (status < 0)
1374 nfs_set_pageerror(mapping);
1375 else
1376 __set_page_dirty_nobuffers(page);
1377out:
1378 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
1379 status, (long long)i_size_read(inode));
1380 return status;
1381}
1382
1383static int flush_task_priority(int how)
1384{
1385 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
1386 case FLUSH_HIGHPRI:
1387 return RPC_PRIORITY_HIGH;
1388 case FLUSH_LOWPRI:
1389 return RPC_PRIORITY_LOW;
1390 }
1391 return RPC_PRIORITY_NORMAL;
1392}
1393
1394static void nfs_initiate_write(struct nfs_pgio_header *hdr,
1395 struct rpc_message *msg,
1396 const struct nfs_rpc_ops *rpc_ops,
1397 struct rpc_task_setup *task_setup_data, int how)
1398{
1399 int priority = flush_task_priority(how);
1400
1401 task_setup_data->priority = priority;
1402 rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client);
1403 trace_nfs_initiate_write(hdr->inode, hdr->io_start, hdr->good_bytes,
1404 hdr->args.stable);
1405}
1406
1407
1408
1409
1410
1411static void nfs_redirty_request(struct nfs_page *req)
1412{
1413 nfs_mark_request_dirty(req);
1414 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
1415 nfs_end_page_writeback(req);
1416 nfs_release_request(req);
1417}
1418
1419static void nfs_async_write_error(struct list_head *head, int error)
1420{
1421 struct nfs_page *req;
1422
1423 while (!list_empty(head)) {
1424 req = nfs_list_entry(head->next);
1425 nfs_list_remove_request(req);
1426 if (nfs_error_is_fatal(error)) {
1427 nfs_context_set_write_error(req->wb_context, error);
1428 if (nfs_error_is_fatal_on_server(error)) {
1429 nfs_write_error_remove_page(req);
1430 continue;
1431 }
1432 }
1433 nfs_redirty_request(req);
1434 }
1435}
1436
1437static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr)
1438{
1439 nfs_async_write_error(&hdr->pages, 0);
1440 filemap_fdatawrite_range(hdr->inode->i_mapping, hdr->args.offset,
1441 hdr->args.offset + hdr->args.count - 1);
1442}
1443
1444static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1445 .init_hdr = nfs_async_write_init,
1446 .error_cleanup = nfs_async_write_error,
1447 .completion = nfs_write_completion,
1448 .reschedule_io = nfs_async_write_reschedule_io,
1449};
1450
1451void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1452 struct inode *inode, int ioflags, bool force_mds,
1453 const struct nfs_pgio_completion_ops *compl_ops)
1454{
1455 struct nfs_server *server = NFS_SERVER(inode);
1456 const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;
1457
1458#ifdef CONFIG_NFS_V4_1
1459 if (server->pnfs_curr_ld && !force_mds)
1460 pg_ops = server->pnfs_curr_ld->pg_write_ops;
1461#endif
1462 nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
1463 server->wsize, ioflags);
1464}
1465EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
1466
1467void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1468{
1469 struct nfs_pgio_mirror *mirror;
1470
1471 if (pgio->pg_ops && pgio->pg_ops->pg_cleanup)
1472 pgio->pg_ops->pg_cleanup(pgio);
1473
1474 pgio->pg_ops = &nfs_pgio_rw_ops;
1475
1476 nfs_pageio_stop_mirroring(pgio);
1477
1478 mirror = &pgio->pg_mirrors[0];
1479 mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1480}
1481EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
1482
1483
1484void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1485{
1486 struct nfs_commit_data *data = calldata;
1487
1488 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1489}
1490
1491
1492
1493
1494static int nfs_should_remove_suid(const struct inode *inode)
1495{
1496 umode_t mode = inode->i_mode;
1497 int kill = 0;
1498
1499
1500 if (unlikely(mode & S_ISUID))
1501 kill = ATTR_KILL_SUID;
1502
1503
1504
1505
1506
1507 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
1508 kill |= ATTR_KILL_SGID;
1509
1510 if (unlikely(kill && S_ISREG(mode)))
1511 return kill;
1512
1513 return 0;
1514}
1515
1516static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr,
1517 struct nfs_fattr *fattr)
1518{
1519 struct nfs_pgio_args *argp = &hdr->args;
1520 struct nfs_pgio_res *resp = &hdr->res;
1521 u64 size = argp->offset + resp->count;
1522
1523 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1524 fattr->size = size;
1525 if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) {
1526 fattr->valid &= ~NFS_ATTR_FATTR_SIZE;
1527 return;
1528 }
1529 if (size != fattr->size)
1530 return;
1531
1532 nfs_fattr_set_barrier(fattr);
1533
1534 fattr->valid |= NFS_ATTR_FATTR_SIZE;
1535}
1536
1537void nfs_writeback_update_inode(struct nfs_pgio_header *hdr)
1538{
1539 struct nfs_fattr *fattr = &hdr->fattr;
1540 struct inode *inode = hdr->inode;
1541
1542 spin_lock(&inode->i_lock);
1543 nfs_writeback_check_extend(hdr, fattr);
1544 nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1545 spin_unlock(&inode->i_lock);
1546}
1547EXPORT_SYMBOL_GPL(nfs_writeback_update_inode);
1548
1549
1550
1551
1552static int nfs_writeback_done(struct rpc_task *task,
1553 struct nfs_pgio_header *hdr,
1554 struct inode *inode)
1555{
1556 int status;
1557
1558
1559
1560
1561
1562
1563
1564
1565 status = NFS_PROTO(inode)->write_done(task, hdr);
1566 if (status != 0)
1567 return status;
1568
1569 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
1570 trace_nfs_writeback_done(inode, task->tk_status,
1571 hdr->args.offset, hdr->res.verf);
1572
1573 if (hdr->res.verf->committed < hdr->args.stable &&
1574 task->tk_status >= 0) {
1575
1576
1577
1578
1579
1580
1581
1582
1583 static unsigned long complain;
1584
1585
1586 if (time_before(complain, jiffies)) {
1587 dprintk("NFS: faulty NFS server %s:"
1588 " (committed = %d) != (stable = %d)\n",
1589 NFS_SERVER(inode)->nfs_client->cl_hostname,
1590 hdr->res.verf->committed, hdr->args.stable);
1591 complain = jiffies + 300 * HZ;
1592 }
1593 }
1594
1595
1596 if (nfs_should_remove_suid(inode)) {
1597 spin_lock(&inode->i_lock);
1598 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1599 spin_unlock(&inode->i_lock);
1600 }
1601 return 0;
1602}
1603
1604
1605
1606
1607static void nfs_writeback_result(struct rpc_task *task,
1608 struct nfs_pgio_header *hdr)
1609{
1610 struct nfs_pgio_args *argp = &hdr->args;
1611 struct nfs_pgio_res *resp = &hdr->res;
1612
1613 if (resp->count < argp->count) {
1614 static unsigned long complain;
1615
1616
1617 nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
1618
1619
1620 if (resp->count == 0) {
1621 if (time_before(complain, jiffies)) {
1622 printk(KERN_WARNING
1623 "NFS: Server wrote zero bytes, expected %u.\n",
1624 argp->count);
1625 complain = jiffies + 300 * HZ;
1626 }
1627 nfs_set_pgio_error(hdr, -EIO, argp->offset);
1628 task->tk_status = -EIO;
1629 return;
1630 }
1631
1632
1633 if (!task->tk_ops) {
1634 hdr->pnfs_error = -EAGAIN;
1635 return;
1636 }
1637
1638
1639 if (resp->verf->committed != NFS_UNSTABLE) {
1640
1641 hdr->mds_offset += resp->count;
1642 argp->offset += resp->count;
1643 argp->pgbase += resp->count;
1644 argp->count -= resp->count;
1645 } else {
1646
1647
1648
1649 argp->stable = NFS_FILE_SYNC;
1650 }
1651 rpc_restart_call_prepare(task);
1652 }
1653}
1654
1655static int wait_on_commit(struct nfs_mds_commit_info *cinfo)
1656{
1657 return wait_var_event_killable(&cinfo->rpcs_out,
1658 !atomic_read(&cinfo->rpcs_out));
1659}
1660
1661static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo)
1662{
1663 atomic_inc(&cinfo->rpcs_out);
1664}
1665
1666static void nfs_commit_end(struct nfs_mds_commit_info *cinfo)
1667{
1668 if (atomic_dec_and_test(&cinfo->rpcs_out))
1669 wake_up_var(&cinfo->rpcs_out);
1670}
1671
1672void nfs_commitdata_release(struct nfs_commit_data *data)
1673{
1674 put_nfs_open_context(data->context);
1675 nfs_commit_free(data);
1676}
1677EXPORT_SYMBOL_GPL(nfs_commitdata_release);
1678
1679int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
1680 const struct nfs_rpc_ops *nfs_ops,
1681 const struct rpc_call_ops *call_ops,
1682 int how, int flags)
1683{
1684 struct rpc_task *task;
1685 int priority = flush_task_priority(how);
1686 struct rpc_message msg = {
1687 .rpc_argp = &data->args,
1688 .rpc_resp = &data->res,
1689 .rpc_cred = data->cred,
1690 };
1691 struct rpc_task_setup task_setup_data = {
1692 .task = &data->task,
1693 .rpc_client = clnt,
1694 .rpc_message = &msg,
1695 .callback_ops = call_ops,
1696 .callback_data = data,
1697 .workqueue = nfsiod_workqueue,
1698 .flags = RPC_TASK_ASYNC | flags,
1699 .priority = priority,
1700 };
1701
1702 nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client);
1703 trace_nfs_initiate_commit(data);
1704
1705 dprintk("NFS: initiated commit call\n");
1706
1707 task = rpc_run_task(&task_setup_data);
1708 if (IS_ERR(task))
1709 return PTR_ERR(task);
1710 if (how & FLUSH_SYNC)
1711 rpc_wait_for_completion_task(task);
1712 rpc_put_task(task);
1713 return 0;
1714}
1715EXPORT_SYMBOL_GPL(nfs_initiate_commit);
1716
1717static loff_t nfs_get_lwb(struct list_head *head)
1718{
1719 loff_t lwb = 0;
1720 struct nfs_page *req;
1721
1722 list_for_each_entry(req, head, wb_list)
1723 if (lwb < (req_offset(req) + req->wb_bytes))
1724 lwb = req_offset(req) + req->wb_bytes;
1725
1726 return lwb;
1727}
1728
1729
1730
1731
1732void nfs_init_commit(struct nfs_commit_data *data,
1733 struct list_head *head,
1734 struct pnfs_layout_segment *lseg,
1735 struct nfs_commit_info *cinfo)
1736{
1737 struct nfs_page *first = nfs_list_entry(head->next);
1738 struct inode *inode = d_inode(first->wb_context->dentry);
1739
1740
1741
1742
1743 list_splice_init(head, &data->pages);
1744
1745 data->inode = inode;
1746 data->cred = first->wb_context->cred;
1747 data->lseg = lseg;
1748
1749 if (lseg)
1750 data->lwb = nfs_get_lwb(&data->pages);
1751 data->mds_ops = &nfs_commit_ops;
1752 data->completion_ops = cinfo->completion_ops;
1753 data->dreq = cinfo->dreq;
1754
1755 data->args.fh = NFS_FH(data->inode);
1756
1757 data->args.offset = 0;
1758 data->args.count = 0;
1759 data->context = get_nfs_open_context(first->wb_context);
1760 data->res.fattr = &data->fattr;
1761 data->res.verf = &data->verf;
1762 nfs_fattr_init(&data->fattr);
1763}
1764EXPORT_SYMBOL_GPL(nfs_init_commit);
1765
1766void nfs_retry_commit(struct list_head *page_list,
1767 struct pnfs_layout_segment *lseg,
1768 struct nfs_commit_info *cinfo,
1769 u32 ds_commit_idx)
1770{
1771 struct nfs_page *req;
1772
1773 while (!list_empty(page_list)) {
1774 req = nfs_list_entry(page_list->next);
1775 nfs_list_remove_request(req);
1776 nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx);
1777 if (!cinfo->dreq)
1778 nfs_clear_page_commit(req->wb_page);
1779 nfs_unlock_and_release_request(req);
1780 }
1781}
1782EXPORT_SYMBOL_GPL(nfs_retry_commit);
1783
1784static void
1785nfs_commit_resched_write(struct nfs_commit_info *cinfo,
1786 struct nfs_page *req)
1787{
1788 __set_page_dirty_nobuffers(req->wb_page);
1789}
1790
1791
1792
1793
1794static int
1795nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1796 struct nfs_commit_info *cinfo)
1797{
1798 struct nfs_commit_data *data;
1799
1800
1801 if (list_empty(head))
1802 return 0;
1803
1804 data = nfs_commitdata_alloc(true);
1805
1806
1807 nfs_init_commit(data, head, NULL, cinfo);
1808 atomic_inc(&cinfo->mds->rpcs_out);
1809 return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),
1810 data->mds_ops, how, 0);
1811}
1812
1813
1814
1815
1816static void nfs_commit_done(struct rpc_task *task, void *calldata)
1817{
1818 struct nfs_commit_data *data = calldata;
1819
1820 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1821 task->tk_pid, task->tk_status);
1822
1823
1824 NFS_PROTO(data->inode)->commit_done(task, data);
1825 trace_nfs_commit_done(data);
1826}
1827
1828static void nfs_commit_release_pages(struct nfs_commit_data *data)
1829{
1830 struct nfs_page *req;
1831 int status = data->task.tk_status;
1832 struct nfs_commit_info cinfo;
1833 struct nfs_server *nfss;
1834
1835 while (!list_empty(&data->pages)) {
1836 req = nfs_list_entry(data->pages.next);
1837 nfs_list_remove_request(req);
1838 if (req->wb_page)
1839 nfs_clear_page_commit(req->wb_page);
1840
1841 dprintk("NFS: commit (%s/%llu %d@%lld)",
1842 req->wb_context->dentry->d_sb->s_id,
1843 (unsigned long long)NFS_FILEID(d_inode(req->wb_context->dentry)),
1844 req->wb_bytes,
1845 (long long)req_offset(req));
1846 if (status < 0) {
1847 nfs_context_set_write_error(req->wb_context, status);
1848 if (req->wb_page)
1849 nfs_inode_remove_request(req);
1850 dprintk_cont(", error = %d\n", status);
1851 goto next;
1852 }
1853
1854
1855
1856 if (!nfs_write_verifier_cmp(&req->wb_verf, &data->verf.verifier)) {
1857
1858 if (req->wb_page)
1859 nfs_inode_remove_request(req);
1860 dprintk_cont(" OK\n");
1861 goto next;
1862 }
1863
1864 dprintk_cont(" mismatch\n");
1865 nfs_mark_request_dirty(req);
1866 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
1867 next:
1868 nfs_unlock_and_release_request(req);
1869
1870 cond_resched();
1871 }
1872 nfss = NFS_SERVER(data->inode);
1873 if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
1874 clear_bdi_congested(inode_to_bdi(data->inode), BLK_RW_ASYNC);
1875
1876 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1877 nfs_commit_end(cinfo.mds);
1878}
1879
1880static void nfs_commit_release(void *calldata)
1881{
1882 struct nfs_commit_data *data = calldata;
1883
1884 data->completion_ops->completion(data);
1885 nfs_commitdata_release(calldata);
1886}
1887
1888static const struct rpc_call_ops nfs_commit_ops = {
1889 .rpc_call_prepare = nfs_commit_prepare,
1890 .rpc_call_done = nfs_commit_done,
1891 .rpc_release = nfs_commit_release,
1892};
1893
1894static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1895 .completion = nfs_commit_release_pages,
1896 .resched_write = nfs_commit_resched_write,
1897};
1898
1899int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1900 int how, struct nfs_commit_info *cinfo)
1901{
1902 int status;
1903
1904 status = pnfs_commit_list(inode, head, how, cinfo);
1905 if (status == PNFS_NOT_ATTEMPTED)
1906 status = nfs_commit_list(inode, head, how, cinfo);
1907 return status;
1908}
1909
1910static int __nfs_commit_inode(struct inode *inode, int how,
1911 struct writeback_control *wbc)
1912{
1913 LIST_HEAD(head);
1914 struct nfs_commit_info cinfo;
1915 int may_wait = how & FLUSH_SYNC;
1916 int ret, nscan;
1917
1918 nfs_init_cinfo_from_inode(&cinfo, inode);
1919 nfs_commit_begin(cinfo.mds);
1920 for (;;) {
1921 ret = nscan = nfs_scan_commit(inode, &head, &cinfo);
1922 if (ret <= 0)
1923 break;
1924 ret = nfs_generic_commit_list(inode, &head, how, &cinfo);
1925 if (ret < 0)
1926 break;
1927 ret = 0;
1928 if (wbc && wbc->sync_mode == WB_SYNC_NONE) {
1929 if (nscan < wbc->nr_to_write)
1930 wbc->nr_to_write -= nscan;
1931 else
1932 wbc->nr_to_write = 0;
1933 }
1934 if (nscan < INT_MAX)
1935 break;
1936 cond_resched();
1937 }
1938 nfs_commit_end(cinfo.mds);
1939 if (ret || !may_wait)
1940 return ret;
1941 return wait_on_commit(cinfo.mds);
1942}
1943
1944int nfs_commit_inode(struct inode *inode, int how)
1945{
1946 return __nfs_commit_inode(inode, how, NULL);
1947}
1948EXPORT_SYMBOL_GPL(nfs_commit_inode);
1949
1950int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1951{
1952 struct nfs_inode *nfsi = NFS_I(inode);
1953 int flags = FLUSH_SYNC;
1954 int ret = 0;
1955
1956 if (wbc->sync_mode == WB_SYNC_NONE) {
1957
1958 if (!atomic_long_read(&nfsi->commit_info.ncommit))
1959 goto check_requests_outstanding;
1960
1961
1962
1963
1964 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1965 goto out_mark_dirty;
1966
1967
1968 flags = 0;
1969 }
1970
1971 ret = __nfs_commit_inode(inode, flags, wbc);
1972 if (!ret) {
1973 if (flags & FLUSH_SYNC)
1974 return 0;
1975 } else if (atomic_long_read(&nfsi->commit_info.ncommit))
1976 goto out_mark_dirty;
1977
1978check_requests_outstanding:
1979 if (!atomic_read(&nfsi->commit_info.rpcs_out))
1980 return ret;
1981out_mark_dirty:
1982 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1983 return ret;
1984}
1985EXPORT_SYMBOL_GPL(nfs_write_inode);
1986
1987
1988
1989
1990
1991
1992
1993int nfs_filemap_write_and_wait_range(struct address_space *mapping,
1994 loff_t lstart, loff_t lend)
1995{
1996 int ret;
1997
1998 ret = filemap_write_and_wait_range(mapping, lstart, lend);
1999 if (ret == 0)
2000 ret = pnfs_sync_inode(mapping->host, true);
2001 return ret;
2002}
2003EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range);
2004
2005
2006
2007
2008int nfs_wb_all(struct inode *inode)
2009{
2010 int ret;
2011
2012 trace_nfs_writeback_inode_enter(inode);
2013
2014 ret = filemap_write_and_wait(inode->i_mapping);
2015 if (ret)
2016 goto out;
2017 ret = nfs_commit_inode(inode, FLUSH_SYNC);
2018 if (ret < 0)
2019 goto out;
2020 pnfs_sync_inode(inode, true);
2021 ret = 0;
2022
2023out:
2024 trace_nfs_writeback_inode_exit(inode, ret);
2025 return ret;
2026}
2027EXPORT_SYMBOL_GPL(nfs_wb_all);
2028
2029int nfs_wb_page_cancel(struct inode *inode, struct page *page)
2030{
2031 struct nfs_page *req;
2032 int ret = 0;
2033
2034 wait_on_page_writeback(page);
2035
2036
2037
2038 req = nfs_lock_and_join_requests(page);
2039
2040 if (IS_ERR(req)) {
2041 ret = PTR_ERR(req);
2042 } else if (req) {
2043
2044
2045
2046
2047 nfs_inode_remove_request(req);
2048 nfs_unlock_and_release_request(req);
2049 }
2050
2051 return ret;
2052}
2053
2054
2055
2056
2057int nfs_wb_page(struct inode *inode, struct page *page)
2058{
2059 loff_t range_start = page_file_offset(page);
2060 loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1);
2061 struct writeback_control wbc = {
2062 .sync_mode = WB_SYNC_ALL,
2063 .nr_to_write = 0,
2064 .range_start = range_start,
2065 .range_end = range_end,
2066 };
2067 int ret;
2068
2069 trace_nfs_writeback_page_enter(inode);
2070
2071 for (;;) {
2072 wait_on_page_writeback(page);
2073 if (clear_page_dirty_for_io(page)) {
2074 ret = nfs_writepage_locked(page, &wbc);
2075 if (ret < 0)
2076 goto out_error;
2077 continue;
2078 }
2079 ret = 0;
2080 if (!PagePrivate(page))
2081 break;
2082 ret = nfs_commit_inode(inode, FLUSH_SYNC);
2083 if (ret < 0)
2084 goto out_error;
2085 }
2086out_error:
2087 trace_nfs_writeback_page_exit(inode, ret);
2088 return ret;
2089}
2090
2091#ifdef CONFIG_MIGRATION
2092int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
2093 struct page *page, enum migrate_mode mode)
2094{
2095
2096
2097
2098
2099
2100
2101
2102
2103 if (PagePrivate(page))
2104 return -EBUSY;
2105
2106 if (!nfs_fscache_release_page(page, GFP_KERNEL))
2107 return -EBUSY;
2108
2109 return migrate_page(mapping, newpage, page, mode);
2110}
2111#endif
2112
2113int __init nfs_init_writepagecache(void)
2114{
2115 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
2116 sizeof(struct nfs_pgio_header),
2117 0, SLAB_HWCACHE_ALIGN,
2118 NULL);
2119 if (nfs_wdata_cachep == NULL)
2120 return -ENOMEM;
2121
2122 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
2123 nfs_wdata_cachep);
2124 if (nfs_wdata_mempool == NULL)
2125 goto out_destroy_write_cache;
2126
2127 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
2128 sizeof(struct nfs_commit_data),
2129 0, SLAB_HWCACHE_ALIGN,
2130 NULL);
2131 if (nfs_cdata_cachep == NULL)
2132 goto out_destroy_write_mempool;
2133
2134 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
2135 nfs_cdata_cachep);
2136 if (nfs_commit_mempool == NULL)
2137 goto out_destroy_commit_cache;
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
2156 if (nfs_congestion_kb > 256*1024)
2157 nfs_congestion_kb = 256*1024;
2158
2159 return 0;
2160
2161out_destroy_commit_cache:
2162 kmem_cache_destroy(nfs_cdata_cachep);
2163out_destroy_write_mempool:
2164 mempool_destroy(nfs_wdata_mempool);
2165out_destroy_write_cache:
2166 kmem_cache_destroy(nfs_wdata_cachep);
2167 return -ENOMEM;
2168}
2169
2170void nfs_destroy_writepagecache(void)
2171{
2172 mempool_destroy(nfs_commit_mempool);
2173 kmem_cache_destroy(nfs_cdata_cachep);
2174 mempool_destroy(nfs_wdata_mempool);
2175 kmem_cache_destroy(nfs_wdata_cachep);
2176}
2177
2178static const struct nfs_rw_ops nfs_rw_write_ops = {
2179 .rw_alloc_header = nfs_writehdr_alloc,
2180 .rw_free_header = nfs_writehdr_free,
2181 .rw_done = nfs_writeback_done,
2182 .rw_result = nfs_writeback_result,
2183 .rw_initiate = nfs_initiate_write,
2184};
2185