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10#include <linux/types.h>
11#include <linux/slab.h>
12#include <linux/mm.h>
13#include <linux/pagemap.h>
14#include <linux/file.h>
15#include <linux/writeback.h>
16#include <linux/swap.h>
17#include <linux/migrate.h>
18
19#include <linux/sunrpc/clnt.h>
20#include <linux/nfs_fs.h>
21#include <linux/nfs_mount.h>
22#include <linux/nfs_page.h>
23#include <linux/backing-dev.h>
24#include <linux/export.h>
25#include <linux/freezer.h>
26#include <linux/wait.h>
27#include <linux/iversion.h>
28
29#include <linux/uaccess.h>
30#include <linux/sched/mm.h>
31
32#include "delegation.h"
33#include "internal.h"
34#include "iostat.h"
35#include "nfs4_fs.h"
36#include "fscache.h"
37#include "pnfs.h"
38
39#include "nfstrace.h"
40
41#define NFSDBG_FACILITY NFSDBG_PAGECACHE
42
43#define MIN_POOL_WRITE (32)
44#define MIN_POOL_COMMIT (4)
45
46struct nfs_io_completion {
47 void (*complete)(void *data);
48 void *data;
49 struct kref refcount;
50};
51
52
53
54
55static void nfs_redirty_request(struct nfs_page *req);
56static const struct rpc_call_ops nfs_commit_ops;
57static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
58static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
59static const struct nfs_rw_ops nfs_rw_write_ops;
60static void nfs_inode_remove_request(struct nfs_page *req);
61static void nfs_clear_request_commit(struct nfs_page *req);
62static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
63 struct inode *inode);
64static struct nfs_page *
65nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
66 struct page *page);
67
68static struct kmem_cache *nfs_wdata_cachep;
69static mempool_t *nfs_wdata_mempool;
70static struct kmem_cache *nfs_cdata_cachep;
71static mempool_t *nfs_commit_mempool;
72
73struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail)
74{
75 struct nfs_commit_data *p;
76
77 if (never_fail)
78 p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
79 else {
80
81
82
83
84
85 p = mempool_alloc(nfs_commit_mempool, GFP_NOWAIT);
86 if (!p)
87 p = kmem_cache_alloc(nfs_cdata_cachep, GFP_NOIO |
88 __GFP_NOWARN | __GFP_NORETRY);
89 if (!p)
90 return NULL;
91 }
92
93 memset(p, 0, sizeof(*p));
94 INIT_LIST_HEAD(&p->pages);
95 return p;
96}
97EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
98
99void nfs_commit_free(struct nfs_commit_data *p)
100{
101 mempool_free(p, nfs_commit_mempool);
102}
103EXPORT_SYMBOL_GPL(nfs_commit_free);
104
105static struct nfs_pgio_header *nfs_writehdr_alloc(void)
106{
107 struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_KERNEL);
108
109 memset(p, 0, sizeof(*p));
110 p->rw_mode = FMODE_WRITE;
111 return p;
112}
113
114static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
115{
116 mempool_free(hdr, nfs_wdata_mempool);
117}
118
119static struct nfs_io_completion *nfs_io_completion_alloc(gfp_t gfp_flags)
120{
121 return kmalloc(sizeof(struct nfs_io_completion), gfp_flags);
122}
123
124static void nfs_io_completion_init(struct nfs_io_completion *ioc,
125 void (*complete)(void *), void *data)
126{
127 ioc->complete = complete;
128 ioc->data = data;
129 kref_init(&ioc->refcount);
130}
131
132static void nfs_io_completion_release(struct kref *kref)
133{
134 struct nfs_io_completion *ioc = container_of(kref,
135 struct nfs_io_completion, refcount);
136 ioc->complete(ioc->data);
137 kfree(ioc);
138}
139
140static void nfs_io_completion_get(struct nfs_io_completion *ioc)
141{
142 if (ioc != NULL)
143 kref_get(&ioc->refcount);
144}
145
146static void nfs_io_completion_put(struct nfs_io_completion *ioc)
147{
148 if (ioc != NULL)
149 kref_put(&ioc->refcount, nfs_io_completion_release);
150}
151
152static void
153nfs_page_set_inode_ref(struct nfs_page *req, struct inode *inode)
154{
155 if (!test_and_set_bit(PG_INODE_REF, &req->wb_flags)) {
156 kref_get(&req->wb_kref);
157 atomic_long_inc(&NFS_I(inode)->nrequests);
158 }
159}
160
161static int
162nfs_cancel_remove_inode(struct nfs_page *req, struct inode *inode)
163{
164 int ret;
165
166 if (!test_bit(PG_REMOVE, &req->wb_flags))
167 return 0;
168 ret = nfs_page_group_lock(req);
169 if (ret)
170 return ret;
171 if (test_and_clear_bit(PG_REMOVE, &req->wb_flags))
172 nfs_page_set_inode_ref(req, inode);
173 nfs_page_group_unlock(req);
174 return 0;
175}
176
177static struct nfs_page *
178nfs_page_private_request(struct page *page)
179{
180 if (!PagePrivate(page))
181 return NULL;
182 return (struct nfs_page *)page_private(page);
183}
184
185
186
187
188
189
190
191
192static struct nfs_page *
193nfs_page_find_private_request(struct page *page)
194{
195 struct address_space *mapping = page_file_mapping(page);
196 struct nfs_page *req;
197
198 if (!PagePrivate(page))
199 return NULL;
200 spin_lock(&mapping->private_lock);
201 req = nfs_page_private_request(page);
202 if (req) {
203 WARN_ON_ONCE(req->wb_head != req);
204 kref_get(&req->wb_kref);
205 }
206 spin_unlock(&mapping->private_lock);
207 return req;
208}
209
210static struct nfs_page *
211nfs_page_find_swap_request(struct page *page)
212{
213 struct inode *inode = page_file_mapping(page)->host;
214 struct nfs_inode *nfsi = NFS_I(inode);
215 struct nfs_page *req = NULL;
216 if (!PageSwapCache(page))
217 return NULL;
218 mutex_lock(&nfsi->commit_mutex);
219 if (PageSwapCache(page)) {
220 req = nfs_page_search_commits_for_head_request_locked(nfsi,
221 page);
222 if (req) {
223 WARN_ON_ONCE(req->wb_head != req);
224 kref_get(&req->wb_kref);
225 }
226 }
227 mutex_unlock(&nfsi->commit_mutex);
228 return req;
229}
230
231
232
233
234
235
236static struct nfs_page *nfs_page_find_head_request(struct page *page)
237{
238 struct nfs_page *req;
239
240 req = nfs_page_find_private_request(page);
241 if (!req)
242 req = nfs_page_find_swap_request(page);
243 return req;
244}
245
246static struct nfs_page *nfs_find_and_lock_page_request(struct page *page)
247{
248 struct inode *inode = page_file_mapping(page)->host;
249 struct nfs_page *req, *head;
250 int ret;
251
252 for (;;) {
253 req = nfs_page_find_head_request(page);
254 if (!req)
255 return req;
256 head = nfs_page_group_lock_head(req);
257 if (head != req)
258 nfs_release_request(req);
259 if (IS_ERR(head))
260 return head;
261 ret = nfs_cancel_remove_inode(head, inode);
262 if (ret < 0) {
263 nfs_unlock_and_release_request(head);
264 return ERR_PTR(ret);
265 }
266
267 if (head == nfs_page_private_request(page))
268 break;
269 if (PageSwapCache(page))
270 break;
271 nfs_unlock_and_release_request(head);
272 }
273 return head;
274}
275
276
277static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
278{
279 struct inode *inode = page_file_mapping(page)->host;
280 loff_t end, i_size;
281 pgoff_t end_index;
282
283 spin_lock(&inode->i_lock);
284 i_size = i_size_read(inode);
285 end_index = (i_size - 1) >> PAGE_SHIFT;
286 if (i_size > 0 && page_index(page) < end_index)
287 goto out;
288 end = page_file_offset(page) + ((loff_t)offset+count);
289 if (i_size >= end)
290 goto out;
291 i_size_write(inode, end);
292 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
293 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
294out:
295 spin_unlock(&inode->i_lock);
296}
297
298
299static void nfs_set_pageerror(struct address_space *mapping)
300{
301 struct inode *inode = mapping->host;
302
303 nfs_zap_mapping(mapping->host, mapping);
304
305 spin_lock(&inode->i_lock);
306 nfs_set_cache_invalid(inode, NFS_INO_REVAL_FORCED |
307 NFS_INO_REVAL_PAGECACHE |
308 NFS_INO_INVALID_SIZE);
309 spin_unlock(&inode->i_lock);
310}
311
312static void nfs_mapping_set_error(struct page *page, int error)
313{
314 struct address_space *mapping = page_file_mapping(page);
315
316 SetPageError(page);
317 mapping_set_error(mapping, error);
318 nfs_set_pageerror(mapping);
319}
320
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323
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325
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327
328
329
330
331
332
333
334static struct nfs_page *
335nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
336{
337 struct nfs_page *req;
338
339 req = head;
340 do {
341 if (page_offset >= req->wb_pgbase &&
342 page_offset < (req->wb_pgbase + req->wb_bytes))
343 return req;
344
345 req = req->wb_this_page;
346 } while (req != head);
347
348 return NULL;
349}
350
351
352
353
354
355
356
357
358static bool nfs_page_group_covers_page(struct nfs_page *req)
359{
360 struct nfs_page *tmp;
361 unsigned int pos = 0;
362 unsigned int len = nfs_page_length(req->wb_page);
363
364 nfs_page_group_lock(req);
365
366 for (;;) {
367 tmp = nfs_page_group_search_locked(req->wb_head, pos);
368 if (!tmp)
369 break;
370 pos = tmp->wb_pgbase + tmp->wb_bytes;
371 }
372
373 nfs_page_group_unlock(req);
374 return pos >= len;
375}
376
377
378
379
380static void nfs_mark_uptodate(struct nfs_page *req)
381{
382 if (PageUptodate(req->wb_page))
383 return;
384 if (!nfs_page_group_covers_page(req))
385 return;
386 SetPageUptodate(req->wb_page);
387}
388
389static int wb_priority(struct writeback_control *wbc)
390{
391 int ret = 0;
392
393 if (wbc->sync_mode == WB_SYNC_ALL)
394 ret = FLUSH_COND_STABLE;
395 return ret;
396}
397
398
399
400
401
402int nfs_congestion_kb;
403
404#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
405#define NFS_CONGESTION_OFF_THRESH \
406 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
407
408static void nfs_set_page_writeback(struct page *page)
409{
410 struct inode *inode = page_file_mapping(page)->host;
411 struct nfs_server *nfss = NFS_SERVER(inode);
412 int ret = test_set_page_writeback(page);
413
414 WARN_ON_ONCE(ret != 0);
415
416 if (atomic_long_inc_return(&nfss->writeback) >
417 NFS_CONGESTION_ON_THRESH)
418 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
419}
420
421static void nfs_end_page_writeback(struct nfs_page *req)
422{
423 struct inode *inode = page_file_mapping(req->wb_page)->host;
424 struct nfs_server *nfss = NFS_SERVER(inode);
425 bool is_done;
426
427 is_done = nfs_page_group_sync_on_bit(req, PG_WB_END);
428 nfs_unlock_request(req);
429 if (!is_done)
430 return;
431
432 end_page_writeback(req->wb_page);
433 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
434 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
435}
436
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440
441
442
443
444
445
446
447static void
448nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
449 struct nfs_page *old_head,
450 struct inode *inode)
451{
452 while (destroy_list) {
453 struct nfs_page *subreq = destroy_list;
454
455 destroy_list = (subreq->wb_this_page == old_head) ?
456 NULL : subreq->wb_this_page;
457
458
459 nfs_page_set_headlock(subreq);
460 WARN_ON_ONCE(old_head != subreq->wb_head);
461
462
463 subreq->wb_this_page = subreq;
464 subreq->wb_head = subreq;
465
466 clear_bit(PG_REMOVE, &subreq->wb_flags);
467
468
469 if (!kref_read(&subreq->wb_kref)) {
470
471 if (test_and_clear_bit(PG_TEARDOWN, &subreq->wb_flags)) {
472 nfs_page_clear_headlock(subreq);
473 nfs_free_request(subreq);
474 } else
475 nfs_page_clear_headlock(subreq);
476 continue;
477 }
478 nfs_page_clear_headlock(subreq);
479
480 nfs_release_request(old_head);
481
482 if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) {
483 nfs_release_request(subreq);
484 atomic_long_dec(&NFS_I(inode)->nrequests);
485 }
486
487
488
489 nfs_unlock_and_release_request(subreq);
490 }
491}
492
493
494
495
496
497
498
499
500
501
502
503
504void
505nfs_join_page_group(struct nfs_page *head, struct inode *inode)
506{
507 struct nfs_page *subreq;
508 struct nfs_page *destroy_list = NULL;
509 unsigned int pgbase, off, bytes;
510
511 pgbase = head->wb_pgbase;
512 bytes = head->wb_bytes;
513 off = head->wb_offset;
514 for (subreq = head->wb_this_page; subreq != head;
515 subreq = subreq->wb_this_page) {
516
517 if (pgbase > subreq->wb_pgbase) {
518 off -= pgbase - subreq->wb_pgbase;
519 bytes += pgbase - subreq->wb_pgbase;
520 pgbase = subreq->wb_pgbase;
521 }
522 bytes = max(subreq->wb_pgbase + subreq->wb_bytes
523 - pgbase, bytes);
524 }
525
526
527 head->wb_pgbase = pgbase;
528 head->wb_bytes = bytes;
529 head->wb_offset = off;
530
531
532
533 subreq = head;
534 do {
535 nfs_clear_request_commit(subreq);
536 subreq = subreq->wb_this_page;
537 } while (subreq != head);
538
539
540 if (head->wb_this_page != head) {
541
542 destroy_list = head->wb_this_page;
543 head->wb_this_page = head;
544 }
545
546 nfs_destroy_unlinked_subrequests(destroy_list, head, inode);
547}
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564static struct nfs_page *
565nfs_lock_and_join_requests(struct page *page)
566{
567 struct inode *inode = page_file_mapping(page)->host;
568 struct nfs_page *head;
569 int ret;
570
571
572
573
574
575
576 head = nfs_find_and_lock_page_request(page);
577 if (IS_ERR_OR_NULL(head))
578 return head;
579
580
581 ret = nfs_page_group_lock_subrequests(head);
582 if (ret < 0) {
583 nfs_unlock_and_release_request(head);
584 return ERR_PTR(ret);
585 }
586
587 nfs_join_page_group(head, inode);
588
589 return head;
590}
591
592static void nfs_write_error(struct nfs_page *req, int error)
593{
594 trace_nfs_write_error(req, error);
595 nfs_mapping_set_error(req->wb_page, error);
596 nfs_inode_remove_request(req);
597 nfs_end_page_writeback(req);
598 nfs_release_request(req);
599}
600
601
602
603
604
605static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
606 struct page *page)
607{
608 struct nfs_page *req;
609 int ret = 0;
610
611 req = nfs_lock_and_join_requests(page);
612 if (!req)
613 goto out;
614 ret = PTR_ERR(req);
615 if (IS_ERR(req))
616 goto out;
617
618 nfs_set_page_writeback(page);
619 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
620
621
622 ret = pgio->pg_error;
623 if (nfs_error_is_fatal_on_server(ret))
624 goto out_launder;
625
626 ret = 0;
627 if (!nfs_pageio_add_request(pgio, req)) {
628 ret = pgio->pg_error;
629
630
631
632 if (nfs_error_is_fatal(ret)) {
633 if (nfs_error_is_fatal_on_server(ret))
634 goto out_launder;
635 } else
636 ret = -EAGAIN;
637 nfs_redirty_request(req);
638 pgio->pg_error = 0;
639 } else
640 nfs_add_stats(page_file_mapping(page)->host,
641 NFSIOS_WRITEPAGES, 1);
642out:
643 return ret;
644out_launder:
645 nfs_write_error(req, ret);
646 return 0;
647}
648
649static int nfs_do_writepage(struct page *page, struct writeback_control *wbc,
650 struct nfs_pageio_descriptor *pgio)
651{
652 int ret;
653
654 nfs_pageio_cond_complete(pgio, page_index(page));
655 ret = nfs_page_async_flush(pgio, page);
656 if (ret == -EAGAIN) {
657 redirty_page_for_writepage(wbc, page);
658 ret = AOP_WRITEPAGE_ACTIVATE;
659 }
660 return ret;
661}
662
663
664
665
666static int nfs_writepage_locked(struct page *page,
667 struct writeback_control *wbc)
668{
669 struct nfs_pageio_descriptor pgio;
670 struct inode *inode = page_file_mapping(page)->host;
671 int err;
672
673 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
674 nfs_pageio_init_write(&pgio, inode, 0,
675 false, &nfs_async_write_completion_ops);
676 err = nfs_do_writepage(page, wbc, &pgio);
677 pgio.pg_error = 0;
678 nfs_pageio_complete(&pgio);
679 if (err < 0)
680 return err;
681 if (nfs_error_is_fatal(pgio.pg_error))
682 return pgio.pg_error;
683 return 0;
684}
685
686int nfs_writepage(struct page *page, struct writeback_control *wbc)
687{
688 int ret;
689
690 ret = nfs_writepage_locked(page, wbc);
691 if (ret != AOP_WRITEPAGE_ACTIVATE)
692 unlock_page(page);
693 return ret;
694}
695
696static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
697{
698 int ret;
699
700 ret = nfs_do_writepage(page, wbc, data);
701 if (ret != AOP_WRITEPAGE_ACTIVATE)
702 unlock_page(page);
703 return ret;
704}
705
706static void nfs_io_completion_commit(void *inode)
707{
708 nfs_commit_inode(inode, 0);
709}
710
711int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
712{
713 struct inode *inode = mapping->host;
714 struct nfs_pageio_descriptor pgio;
715 struct nfs_io_completion *ioc = NULL;
716 unsigned int mntflags = NFS_SERVER(inode)->flags;
717 int priority = 0;
718 int err;
719
720 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
721
722 if (!(mntflags & NFS_MOUNT_WRITE_EAGER) || wbc->for_kupdate ||
723 wbc->for_background || wbc->for_sync || wbc->for_reclaim) {
724 ioc = nfs_io_completion_alloc(GFP_KERNEL);
725 if (ioc)
726 nfs_io_completion_init(ioc, nfs_io_completion_commit,
727 inode);
728 priority = wb_priority(wbc);
729 }
730
731 nfs_pageio_init_write(&pgio, inode, priority, false,
732 &nfs_async_write_completion_ops);
733 pgio.pg_io_completion = ioc;
734 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
735 pgio.pg_error = 0;
736 nfs_pageio_complete(&pgio);
737 nfs_io_completion_put(ioc);
738
739 if (err < 0)
740 goto out_err;
741 err = pgio.pg_error;
742 if (nfs_error_is_fatal(err))
743 goto out_err;
744 return 0;
745out_err:
746 return err;
747}
748
749
750
751
752static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
753{
754 struct address_space *mapping = page_file_mapping(req->wb_page);
755 struct nfs_inode *nfsi = NFS_I(inode);
756
757 WARN_ON_ONCE(req->wb_this_page != req);
758
759
760 nfs_lock_request(req);
761
762
763
764
765
766 spin_lock(&mapping->private_lock);
767 if (likely(!PageSwapCache(req->wb_page))) {
768 set_bit(PG_MAPPED, &req->wb_flags);
769 SetPagePrivate(req->wb_page);
770 set_page_private(req->wb_page, (unsigned long)req);
771 }
772 spin_unlock(&mapping->private_lock);
773 atomic_long_inc(&nfsi->nrequests);
774
775
776
777
778 WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
779 kref_get(&req->wb_kref);
780}
781
782
783
784
785static void nfs_inode_remove_request(struct nfs_page *req)
786{
787 struct address_space *mapping = page_file_mapping(req->wb_page);
788 struct inode *inode = mapping->host;
789 struct nfs_inode *nfsi = NFS_I(inode);
790 struct nfs_page *head;
791
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 atomic_long_dec(&nfsi->nrequests);
807 }
808}
809
810static void
811nfs_mark_request_dirty(struct nfs_page *req)
812{
813 if (req->wb_page)
814 __set_page_dirty_nobuffers(req->wb_page);
815}
816
817
818
819
820
821
822
823
824
825static struct nfs_page *
826nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
827 struct page *page)
828{
829 struct nfs_page *freq, *t;
830 struct nfs_commit_info cinfo;
831 struct inode *inode = &nfsi->vfs_inode;
832
833 nfs_init_cinfo_from_inode(&cinfo, inode);
834
835
836 freq = pnfs_search_commit_reqs(inode, &cinfo, page);
837 if (freq)
838 return freq->wb_head;
839
840
841 list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) {
842 if (freq->wb_page == page)
843 return freq->wb_head;
844 }
845
846 return NULL;
847}
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862void
863nfs_request_add_commit_list_locked(struct nfs_page *req, struct list_head *dst,
864 struct nfs_commit_info *cinfo)
865{
866 set_bit(PG_CLEAN, &req->wb_flags);
867 nfs_list_add_request(req, dst);
868 atomic_long_inc(&cinfo->mds->ncommit);
869}
870EXPORT_SYMBOL_GPL(nfs_request_add_commit_list_locked);
871
872
873
874
875
876
877
878
879
880
881
882
883
884void
885nfs_request_add_commit_list(struct nfs_page *req, struct nfs_commit_info *cinfo)
886{
887 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
888 nfs_request_add_commit_list_locked(req, &cinfo->mds->list, cinfo);
889 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
890 if (req->wb_page)
891 nfs_mark_page_unstable(req->wb_page, cinfo);
892}
893EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
894
895
896
897
898
899
900
901
902
903
904
905
906void
907nfs_request_remove_commit_list(struct nfs_page *req,
908 struct nfs_commit_info *cinfo)
909{
910 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
911 return;
912 nfs_list_remove_request(req);
913 atomic_long_dec(&cinfo->mds->ncommit);
914}
915EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
916
917static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
918 struct inode *inode)
919{
920 cinfo->inode = inode;
921 cinfo->mds = &NFS_I(inode)->commit_info;
922 cinfo->ds = pnfs_get_ds_info(inode);
923 cinfo->dreq = NULL;
924 cinfo->completion_ops = &nfs_commit_completion_ops;
925}
926
927void nfs_init_cinfo(struct nfs_commit_info *cinfo,
928 struct inode *inode,
929 struct nfs_direct_req *dreq)
930{
931 if (dreq)
932 nfs_init_cinfo_from_dreq(cinfo, dreq);
933 else
934 nfs_init_cinfo_from_inode(cinfo, inode);
935}
936EXPORT_SYMBOL_GPL(nfs_init_cinfo);
937
938
939
940
941void
942nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
943 struct nfs_commit_info *cinfo, u32 ds_commit_idx)
944{
945 if (pnfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx))
946 return;
947 nfs_request_add_commit_list(req, cinfo);
948}
949
950static void
951nfs_clear_page_commit(struct page *page)
952{
953 dec_node_page_state(page, NR_WRITEBACK);
954 dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
955 WB_WRITEBACK);
956}
957
958
959static void
960nfs_clear_request_commit(struct nfs_page *req)
961{
962 if (test_bit(PG_CLEAN, &req->wb_flags)) {
963 struct nfs_open_context *ctx = nfs_req_openctx(req);
964 struct inode *inode = d_inode(ctx->dentry);
965 struct nfs_commit_info cinfo;
966
967 nfs_init_cinfo_from_inode(&cinfo, inode);
968 mutex_lock(&NFS_I(inode)->commit_mutex);
969 if (!pnfs_clear_request_commit(req, &cinfo)) {
970 nfs_request_remove_commit_list(req, &cinfo);
971 }
972 mutex_unlock(&NFS_I(inode)->commit_mutex);
973 nfs_clear_page_commit(req->wb_page);
974 }
975}
976
977int nfs_write_need_commit(struct nfs_pgio_header *hdr)
978{
979 if (hdr->verf.committed == NFS_DATA_SYNC)
980 return hdr->lseg == NULL;
981 return hdr->verf.committed != NFS_FILE_SYNC;
982}
983
984static void nfs_async_write_init(struct nfs_pgio_header *hdr)
985{
986 nfs_io_completion_get(hdr->io_completion);
987}
988
989static void nfs_write_completion(struct nfs_pgio_header *hdr)
990{
991 struct nfs_commit_info cinfo;
992 unsigned long bytes = 0;
993
994 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
995 goto out;
996 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
997 while (!list_empty(&hdr->pages)) {
998 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
999
1000 bytes += req->wb_bytes;
1001 nfs_list_remove_request(req);
1002 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
1003 (hdr->good_bytes < bytes)) {
1004 trace_nfs_comp_error(req, hdr->error);
1005 nfs_mapping_set_error(req->wb_page, hdr->error);
1006 goto remove_req;
1007 }
1008 if (nfs_write_need_commit(hdr)) {
1009
1010 req->wb_nio = 0;
1011 memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
1012 nfs_mark_request_commit(req, hdr->lseg, &cinfo,
1013 hdr->pgio_mirror_idx);
1014 goto next;
1015 }
1016remove_req:
1017 nfs_inode_remove_request(req);
1018next:
1019 nfs_end_page_writeback(req);
1020 nfs_release_request(req);
1021 }
1022out:
1023 nfs_io_completion_put(hdr->io_completion);
1024 hdr->release(hdr);
1025}
1026
1027unsigned long
1028nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
1029{
1030 return atomic_long_read(&cinfo->mds->ncommit);
1031}
1032
1033
1034int
1035nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
1036 struct nfs_commit_info *cinfo, int max)
1037{
1038 struct nfs_page *req, *tmp;
1039 int ret = 0;
1040
1041restart:
1042 list_for_each_entry_safe(req, tmp, src, wb_list) {
1043 kref_get(&req->wb_kref);
1044 if (!nfs_lock_request(req)) {
1045 int status;
1046
1047
1048 if (!list_empty(dst)) {
1049 nfs_release_request(req);
1050 continue;
1051 }
1052
1053 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1054 status = nfs_wait_on_request(req);
1055 nfs_release_request(req);
1056 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1057 if (status < 0)
1058 break;
1059 goto restart;
1060 }
1061 nfs_request_remove_commit_list(req, cinfo);
1062 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1063 nfs_list_add_request(req, dst);
1064 ret++;
1065 if ((ret == max) && !cinfo->dreq)
1066 break;
1067 cond_resched();
1068 }
1069 return ret;
1070}
1071EXPORT_SYMBOL_GPL(nfs_scan_commit_list);
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082int
1083nfs_scan_commit(struct inode *inode, struct list_head *dst,
1084 struct nfs_commit_info *cinfo)
1085{
1086 int ret = 0;
1087
1088 if (!atomic_long_read(&cinfo->mds->ncommit))
1089 return 0;
1090 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1091 if (atomic_long_read(&cinfo->mds->ncommit) > 0) {
1092 const int max = INT_MAX;
1093
1094 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
1095 cinfo, max);
1096 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
1097 }
1098 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1099 return ret;
1100}
1101
1102
1103
1104
1105
1106
1107
1108
1109static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
1110 struct page *page,
1111 unsigned int offset,
1112 unsigned int bytes)
1113{
1114 struct nfs_page *req;
1115 unsigned int rqend;
1116 unsigned int end;
1117 int error;
1118
1119 end = offset + bytes;
1120
1121 req = nfs_lock_and_join_requests(page);
1122 if (IS_ERR_OR_NULL(req))
1123 return req;
1124
1125 rqend = req->wb_offset + req->wb_bytes;
1126
1127
1128
1129
1130
1131
1132 if (offset > rqend || end < req->wb_offset)
1133 goto out_flushme;
1134
1135
1136 if (offset < req->wb_offset) {
1137 req->wb_offset = offset;
1138 req->wb_pgbase = offset;
1139 }
1140 if (end > rqend)
1141 req->wb_bytes = end - req->wb_offset;
1142 else
1143 req->wb_bytes = rqend - req->wb_offset;
1144 req->wb_nio = 0;
1145 return req;
1146out_flushme:
1147
1148
1149
1150
1151
1152 nfs_mark_request_dirty(req);
1153 nfs_unlock_and_release_request(req);
1154 error = nfs_wb_page(inode, page);
1155 return (error < 0) ? ERR_PTR(error) : NULL;
1156}
1157
1158
1159
1160
1161
1162
1163
1164
1165static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
1166 struct page *page, unsigned int offset, unsigned int bytes)
1167{
1168 struct inode *inode = page_file_mapping(page)->host;
1169 struct nfs_page *req;
1170
1171 req = nfs_try_to_update_request(inode, page, offset, bytes);
1172 if (req != NULL)
1173 goto out;
1174 req = nfs_create_request(ctx, page, offset, bytes);
1175 if (IS_ERR(req))
1176 goto out;
1177 nfs_inode_add_request(inode, req);
1178out:
1179 return req;
1180}
1181
1182static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
1183 unsigned int offset, unsigned int count)
1184{
1185 struct nfs_page *req;
1186
1187 req = nfs_setup_write_request(ctx, page, offset, count);
1188 if (IS_ERR(req))
1189 return PTR_ERR(req);
1190
1191 nfs_grow_file(page, offset, count);
1192 nfs_mark_uptodate(req);
1193 nfs_mark_request_dirty(req);
1194 nfs_unlock_and_release_request(req);
1195 return 0;
1196}
1197
1198int nfs_flush_incompatible(struct file *file, struct page *page)
1199{
1200 struct nfs_open_context *ctx = nfs_file_open_context(file);
1201 struct nfs_lock_context *l_ctx;
1202 struct file_lock_context *flctx = file_inode(file)->i_flctx;
1203 struct nfs_page *req;
1204 int do_flush, status;
1205
1206
1207
1208
1209
1210
1211
1212
1213 do {
1214 req = nfs_page_find_head_request(page);
1215 if (req == NULL)
1216 return 0;
1217 l_ctx = req->wb_lock_context;
1218 do_flush = req->wb_page != page ||
1219 !nfs_match_open_context(nfs_req_openctx(req), ctx);
1220 if (l_ctx && flctx &&
1221 !(list_empty_careful(&flctx->flc_posix) &&
1222 list_empty_careful(&flctx->flc_flock))) {
1223 do_flush |= l_ctx->lockowner != current->files;
1224 }
1225 nfs_release_request(req);
1226 if (!do_flush)
1227 return 0;
1228 status = nfs_wb_page(page_file_mapping(page)->host, page);
1229 } while (status == 0);
1230 return status;
1231}
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243int
1244nfs_key_timeout_notify(struct file *filp, struct inode *inode)
1245{
1246 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1247
1248 if (nfs_ctx_key_to_expire(ctx, inode) &&
1249 !ctx->ll_cred)
1250
1251 return -EACCES;
1252 return 0;
1253}
1254
1255
1256
1257
1258bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode)
1259{
1260 struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;
1261 struct rpc_cred *cred = ctx->ll_cred;
1262 struct auth_cred acred = {
1263 .cred = ctx->cred,
1264 };
1265
1266 if (cred && !cred->cr_ops->crmatch(&acred, cred, 0)) {
1267 put_rpccred(cred);
1268 ctx->ll_cred = NULL;
1269 cred = NULL;
1270 }
1271 if (!cred)
1272 cred = auth->au_ops->lookup_cred(auth, &acred, 0);
1273 if (!cred || IS_ERR(cred))
1274 return true;
1275 ctx->ll_cred = cred;
1276 return !!(cred->cr_ops->crkey_timeout &&
1277 cred->cr_ops->crkey_timeout(cred));
1278}
1279
1280
1281
1282
1283
1284
1285static bool nfs_write_pageuptodate(struct page *page, struct inode *inode,
1286 unsigned int pagelen)
1287{
1288 struct nfs_inode *nfsi = NFS_I(inode);
1289
1290 if (nfs_have_delegated_attributes(inode))
1291 goto out;
1292 if (nfsi->cache_validity &
1293 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE))
1294 return false;
1295 smp_rmb();
1296 if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags) && pagelen != 0)
1297 return false;
1298out:
1299 if (nfsi->cache_validity & NFS_INO_INVALID_DATA && pagelen != 0)
1300 return false;
1301 return PageUptodate(page) != 0;
1302}
1303
1304static bool
1305is_whole_file_wrlock(struct file_lock *fl)
1306{
1307 return fl->fl_start == 0 && fl->fl_end == OFFSET_MAX &&
1308 fl->fl_type == F_WRLCK;
1309}
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319static int nfs_can_extend_write(struct file *file, struct page *page,
1320 struct inode *inode, unsigned int pagelen)
1321{
1322 int ret;
1323 struct file_lock_context *flctx = inode->i_flctx;
1324 struct file_lock *fl;
1325
1326 if (file->f_flags & O_DSYNC)
1327 return 0;
1328 if (!nfs_write_pageuptodate(page, inode, pagelen))
1329 return 0;
1330 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
1331 return 1;
1332 if (!flctx || (list_empty_careful(&flctx->flc_flock) &&
1333 list_empty_careful(&flctx->flc_posix)))
1334 return 1;
1335
1336
1337 ret = 0;
1338 spin_lock(&flctx->flc_lock);
1339 if (!list_empty(&flctx->flc_posix)) {
1340 fl = list_first_entry(&flctx->flc_posix, struct file_lock,
1341 fl_list);
1342 if (is_whole_file_wrlock(fl))
1343 ret = 1;
1344 } else if (!list_empty(&flctx->flc_flock)) {
1345 fl = list_first_entry(&flctx->flc_flock, struct file_lock,
1346 fl_list);
1347 if (fl->fl_type == F_WRLCK)
1348 ret = 1;
1349 }
1350 spin_unlock(&flctx->flc_lock);
1351 return ret;
1352}
1353
1354
1355
1356
1357
1358
1359
1360int nfs_updatepage(struct file *file, struct page *page,
1361 unsigned int offset, unsigned int count)
1362{
1363 struct nfs_open_context *ctx = nfs_file_open_context(file);
1364 struct address_space *mapping = page_file_mapping(page);
1365 struct inode *inode = mapping->host;
1366 unsigned int pagelen = nfs_page_length(page);
1367 int status = 0;
1368
1369 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
1370
1371 dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
1372 file, count, (long long)(page_file_offset(page) + offset));
1373
1374 if (!count)
1375 goto out;
1376
1377 if (nfs_can_extend_write(file, page, inode, pagelen)) {
1378 count = max(count + offset, pagelen);
1379 offset = 0;
1380 }
1381
1382 status = nfs_writepage_setup(ctx, page, offset, count);
1383 if (status < 0)
1384 nfs_set_pageerror(mapping);
1385 else
1386 __set_page_dirty_nobuffers(page);
1387out:
1388 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
1389 status, (long long)i_size_read(inode));
1390 return status;
1391}
1392
1393static int flush_task_priority(int how)
1394{
1395 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
1396 case FLUSH_HIGHPRI:
1397 return RPC_PRIORITY_HIGH;
1398 case FLUSH_LOWPRI:
1399 return RPC_PRIORITY_LOW;
1400 }
1401 return RPC_PRIORITY_NORMAL;
1402}
1403
1404static void nfs_initiate_write(struct nfs_pgio_header *hdr,
1405 struct rpc_message *msg,
1406 const struct nfs_rpc_ops *rpc_ops,
1407 struct rpc_task_setup *task_setup_data, int how)
1408{
1409 int priority = flush_task_priority(how);
1410
1411 task_setup_data->priority = priority;
1412 rpc_ops->write_setup(hdr, msg, &task_setup_data->rpc_client);
1413 trace_nfs_initiate_write(hdr);
1414}
1415
1416
1417
1418
1419
1420static void nfs_redirty_request(struct nfs_page *req)
1421{
1422
1423 req->wb_nio++;
1424 nfs_mark_request_dirty(req);
1425 set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags);
1426 nfs_end_page_writeback(req);
1427 nfs_release_request(req);
1428}
1429
1430static void nfs_async_write_error(struct list_head *head, int error)
1431{
1432 struct nfs_page *req;
1433
1434 while (!list_empty(head)) {
1435 req = nfs_list_entry(head->next);
1436 nfs_list_remove_request(req);
1437 if (nfs_error_is_fatal(error))
1438 nfs_write_error(req, error);
1439 else
1440 nfs_redirty_request(req);
1441 }
1442}
1443
1444static void nfs_async_write_reschedule_io(struct nfs_pgio_header *hdr)
1445{
1446 nfs_async_write_error(&hdr->pages, 0);
1447 filemap_fdatawrite_range(hdr->inode->i_mapping, hdr->args.offset,
1448 hdr->args.offset + hdr->args.count - 1);
1449}
1450
1451static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1452 .init_hdr = nfs_async_write_init,
1453 .error_cleanup = nfs_async_write_error,
1454 .completion = nfs_write_completion,
1455 .reschedule_io = nfs_async_write_reschedule_io,
1456};
1457
1458void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1459 struct inode *inode, int ioflags, bool force_mds,
1460 const struct nfs_pgio_completion_ops *compl_ops)
1461{
1462 struct nfs_server *server = NFS_SERVER(inode);
1463 const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;
1464
1465#ifdef CONFIG_NFS_V4_1
1466 if (server->pnfs_curr_ld && !force_mds)
1467 pg_ops = server->pnfs_curr_ld->pg_write_ops;
1468#endif
1469 nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
1470 server->wsize, ioflags);
1471}
1472EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
1473
1474void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1475{
1476 struct nfs_pgio_mirror *mirror;
1477
1478 if (pgio->pg_ops && pgio->pg_ops->pg_cleanup)
1479 pgio->pg_ops->pg_cleanup(pgio);
1480
1481 pgio->pg_ops = &nfs_pgio_rw_ops;
1482
1483 nfs_pageio_stop_mirroring(pgio);
1484
1485 mirror = &pgio->pg_mirrors[0];
1486 mirror->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1487}
1488EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
1489
1490
1491void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1492{
1493 struct nfs_commit_data *data = calldata;
1494
1495 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1496}
1497
1498
1499
1500
1501static int nfs_should_remove_suid(const struct inode *inode)
1502{
1503 umode_t mode = inode->i_mode;
1504 int kill = 0;
1505
1506
1507 if (unlikely(mode & S_ISUID))
1508 kill = ATTR_KILL_SUID;
1509
1510
1511
1512
1513
1514 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
1515 kill |= ATTR_KILL_SGID;
1516
1517 if (unlikely(kill && S_ISREG(mode)))
1518 return kill;
1519
1520 return 0;
1521}
1522
1523static void nfs_writeback_check_extend(struct nfs_pgio_header *hdr,
1524 struct nfs_fattr *fattr)
1525{
1526 struct nfs_pgio_args *argp = &hdr->args;
1527 struct nfs_pgio_res *resp = &hdr->res;
1528 u64 size = argp->offset + resp->count;
1529
1530 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1531 fattr->size = size;
1532 if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) {
1533 fattr->valid &= ~NFS_ATTR_FATTR_SIZE;
1534 return;
1535 }
1536 if (size != fattr->size)
1537 return;
1538
1539 nfs_fattr_set_barrier(fattr);
1540
1541 fattr->valid |= NFS_ATTR_FATTR_SIZE;
1542}
1543
1544void nfs_writeback_update_inode(struct nfs_pgio_header *hdr)
1545{
1546 struct nfs_fattr *fattr = &hdr->fattr;
1547 struct inode *inode = hdr->inode;
1548
1549 spin_lock(&inode->i_lock);
1550 nfs_writeback_check_extend(hdr, fattr);
1551 nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1552 spin_unlock(&inode->i_lock);
1553}
1554EXPORT_SYMBOL_GPL(nfs_writeback_update_inode);
1555
1556
1557
1558
1559static int nfs_writeback_done(struct rpc_task *task,
1560 struct nfs_pgio_header *hdr,
1561 struct inode *inode)
1562{
1563 int status;
1564
1565
1566
1567
1568
1569
1570
1571
1572 status = NFS_PROTO(inode)->write_done(task, hdr);
1573 if (status != 0)
1574 return status;
1575
1576 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
1577 trace_nfs_writeback_done(task, hdr);
1578
1579 if (hdr->res.verf->committed < hdr->args.stable &&
1580 task->tk_status >= 0) {
1581
1582
1583
1584
1585
1586
1587
1588
1589 static unsigned long complain;
1590
1591
1592 if (time_before(complain, jiffies)) {
1593 dprintk("NFS: faulty NFS server %s:"
1594 " (committed = %d) != (stable = %d)\n",
1595 NFS_SERVER(inode)->nfs_client->cl_hostname,
1596 hdr->res.verf->committed, hdr->args.stable);
1597 complain = jiffies + 300 * HZ;
1598 }
1599 }
1600
1601
1602 if (nfs_should_remove_suid(inode)) {
1603 spin_lock(&inode->i_lock);
1604 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
1605 spin_unlock(&inode->i_lock);
1606 }
1607 return 0;
1608}
1609
1610
1611
1612
1613static void nfs_writeback_result(struct rpc_task *task,
1614 struct nfs_pgio_header *hdr)
1615{
1616 struct nfs_pgio_args *argp = &hdr->args;
1617 struct nfs_pgio_res *resp = &hdr->res;
1618
1619 if (resp->count < argp->count) {
1620 static unsigned long complain;
1621
1622
1623 nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
1624
1625
1626 if (resp->count == 0) {
1627 if (time_before(complain, jiffies)) {
1628 printk(KERN_WARNING
1629 "NFS: Server wrote zero bytes, expected %u.\n",
1630 argp->count);
1631 complain = jiffies + 300 * HZ;
1632 }
1633 nfs_set_pgio_error(hdr, -EIO, argp->offset);
1634 task->tk_status = -EIO;
1635 return;
1636 }
1637
1638
1639 if (!task->tk_ops) {
1640 hdr->pnfs_error = -EAGAIN;
1641 return;
1642 }
1643
1644
1645 if (resp->verf->committed != NFS_UNSTABLE) {
1646
1647 hdr->mds_offset += resp->count;
1648 argp->offset += resp->count;
1649 argp->pgbase += resp->count;
1650 argp->count -= resp->count;
1651 } else {
1652
1653
1654
1655 argp->stable = NFS_FILE_SYNC;
1656 }
1657 resp->count = 0;
1658 resp->verf->committed = 0;
1659 rpc_restart_call_prepare(task);
1660 }
1661}
1662
1663static int wait_on_commit(struct nfs_mds_commit_info *cinfo)
1664{
1665 return wait_var_event_killable(&cinfo->rpcs_out,
1666 !atomic_read(&cinfo->rpcs_out));
1667}
1668
1669static void nfs_commit_begin(struct nfs_mds_commit_info *cinfo)
1670{
1671 atomic_inc(&cinfo->rpcs_out);
1672}
1673
1674static void nfs_commit_end(struct nfs_mds_commit_info *cinfo)
1675{
1676 if (atomic_dec_and_test(&cinfo->rpcs_out))
1677 wake_up_var(&cinfo->rpcs_out);
1678}
1679
1680void nfs_commitdata_release(struct nfs_commit_data *data)
1681{
1682 put_nfs_open_context(data->context);
1683 nfs_commit_free(data);
1684}
1685EXPORT_SYMBOL_GPL(nfs_commitdata_release);
1686
1687int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
1688 const struct nfs_rpc_ops *nfs_ops,
1689 const struct rpc_call_ops *call_ops,
1690 int how, int flags)
1691{
1692 struct rpc_task *task;
1693 int priority = flush_task_priority(how);
1694 struct rpc_message msg = {
1695 .rpc_argp = &data->args,
1696 .rpc_resp = &data->res,
1697 .rpc_cred = data->cred,
1698 };
1699 struct rpc_task_setup task_setup_data = {
1700 .task = &data->task,
1701 .rpc_client = clnt,
1702 .rpc_message = &msg,
1703 .callback_ops = call_ops,
1704 .callback_data = data,
1705 .workqueue = nfsiod_workqueue,
1706 .flags = RPC_TASK_ASYNC | flags,
1707 .priority = priority,
1708 };
1709
1710 nfs_ops->commit_setup(data, &msg, &task_setup_data.rpc_client);
1711 trace_nfs_initiate_commit(data);
1712
1713 dprintk("NFS: initiated commit call\n");
1714
1715 task = rpc_run_task(&task_setup_data);
1716 if (IS_ERR(task))
1717 return PTR_ERR(task);
1718 if (how & FLUSH_SYNC)
1719 rpc_wait_for_completion_task(task);
1720 rpc_put_task(task);
1721 return 0;
1722}
1723EXPORT_SYMBOL_GPL(nfs_initiate_commit);
1724
1725static loff_t nfs_get_lwb(struct list_head *head)
1726{
1727 loff_t lwb = 0;
1728 struct nfs_page *req;
1729
1730 list_for_each_entry(req, head, wb_list)
1731 if (lwb < (req_offset(req) + req->wb_bytes))
1732 lwb = req_offset(req) + req->wb_bytes;
1733
1734 return lwb;
1735}
1736
1737
1738
1739
1740void nfs_init_commit(struct nfs_commit_data *data,
1741 struct list_head *head,
1742 struct pnfs_layout_segment *lseg,
1743 struct nfs_commit_info *cinfo)
1744{
1745 struct nfs_page *first;
1746 struct nfs_open_context *ctx;
1747 struct inode *inode;
1748
1749
1750
1751
1752 if (head)
1753 list_splice_init(head, &data->pages);
1754
1755 first = nfs_list_entry(data->pages.next);
1756 ctx = nfs_req_openctx(first);
1757 inode = d_inode(ctx->dentry);
1758
1759 data->inode = inode;
1760 data->cred = ctx->cred;
1761 data->lseg = lseg;
1762
1763 if (lseg)
1764 data->lwb = nfs_get_lwb(&data->pages);
1765 data->mds_ops = &nfs_commit_ops;
1766 data->completion_ops = cinfo->completion_ops;
1767 data->dreq = cinfo->dreq;
1768
1769 data->args.fh = NFS_FH(data->inode);
1770
1771 data->args.offset = 0;
1772 data->args.count = 0;
1773 data->context = get_nfs_open_context(ctx);
1774 data->res.fattr = &data->fattr;
1775 data->res.verf = &data->verf;
1776 nfs_fattr_init(&data->fattr);
1777}
1778EXPORT_SYMBOL_GPL(nfs_init_commit);
1779
1780void nfs_retry_commit(struct list_head *page_list,
1781 struct pnfs_layout_segment *lseg,
1782 struct nfs_commit_info *cinfo,
1783 u32 ds_commit_idx)
1784{
1785 struct nfs_page *req;
1786
1787 while (!list_empty(page_list)) {
1788 req = nfs_list_entry(page_list->next);
1789 nfs_list_remove_request(req);
1790 nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx);
1791 if (!cinfo->dreq)
1792 nfs_clear_page_commit(req->wb_page);
1793 nfs_unlock_and_release_request(req);
1794 }
1795}
1796EXPORT_SYMBOL_GPL(nfs_retry_commit);
1797
1798static void
1799nfs_commit_resched_write(struct nfs_commit_info *cinfo,
1800 struct nfs_page *req)
1801{
1802 __set_page_dirty_nobuffers(req->wb_page);
1803}
1804
1805
1806
1807
1808static int
1809nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1810 struct nfs_commit_info *cinfo)
1811{
1812 struct nfs_commit_data *data;
1813 unsigned short task_flags = 0;
1814
1815
1816 if (list_empty(head))
1817 return 0;
1818
1819 data = nfs_commitdata_alloc(true);
1820
1821
1822 nfs_init_commit(data, head, NULL, cinfo);
1823 atomic_inc(&cinfo->mds->rpcs_out);
1824 if (NFS_SERVER(inode)->nfs_client->cl_minorversion)
1825 task_flags = RPC_TASK_MOVEABLE;
1826 return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),
1827 data->mds_ops, how,
1828 RPC_TASK_CRED_NOREF | task_flags);
1829}
1830
1831
1832
1833
1834static void nfs_commit_done(struct rpc_task *task, void *calldata)
1835{
1836 struct nfs_commit_data *data = calldata;
1837
1838 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1839 task->tk_pid, task->tk_status);
1840
1841
1842 NFS_PROTO(data->inode)->commit_done(task, data);
1843 trace_nfs_commit_done(task, data);
1844}
1845
1846static void nfs_commit_release_pages(struct nfs_commit_data *data)
1847{
1848 const struct nfs_writeverf *verf = data->res.verf;
1849 struct nfs_page *req;
1850 int status = data->task.tk_status;
1851 struct nfs_commit_info cinfo;
1852 struct nfs_server *nfss;
1853
1854 while (!list_empty(&data->pages)) {
1855 req = nfs_list_entry(data->pages.next);
1856 nfs_list_remove_request(req);
1857 if (req->wb_page)
1858 nfs_clear_page_commit(req->wb_page);
1859
1860 dprintk("NFS: commit (%s/%llu %d@%lld)",
1861 nfs_req_openctx(req)->dentry->d_sb->s_id,
1862 (unsigned long long)NFS_FILEID(d_inode(nfs_req_openctx(req)->dentry)),
1863 req->wb_bytes,
1864 (long long)req_offset(req));
1865 if (status < 0) {
1866 if (req->wb_page) {
1867 trace_nfs_commit_error(req, status);
1868 nfs_mapping_set_error(req->wb_page, status);
1869 nfs_inode_remove_request(req);
1870 }
1871 dprintk_cont(", error = %d\n", status);
1872 goto next;
1873 }
1874
1875
1876
1877 if (nfs_write_match_verf(verf, req)) {
1878
1879 if (req->wb_page)
1880 nfs_inode_remove_request(req);
1881 dprintk_cont(" OK\n");
1882 goto next;
1883 }
1884
1885 dprintk_cont(" mismatch\n");
1886 nfs_mark_request_dirty(req);
1887 set_bit(NFS_CONTEXT_RESEND_WRITES, &nfs_req_openctx(req)->flags);
1888 next:
1889 nfs_unlock_and_release_request(req);
1890
1891 cond_resched();
1892 }
1893 nfss = NFS_SERVER(data->inode);
1894 if (atomic_long_read(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
1895 clear_bdi_congested(inode_to_bdi(data->inode), BLK_RW_ASYNC);
1896
1897 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1898 nfs_commit_end(cinfo.mds);
1899}
1900
1901static void nfs_commit_release(void *calldata)
1902{
1903 struct nfs_commit_data *data = calldata;
1904
1905 data->completion_ops->completion(data);
1906 nfs_commitdata_release(calldata);
1907}
1908
1909static const struct rpc_call_ops nfs_commit_ops = {
1910 .rpc_call_prepare = nfs_commit_prepare,
1911 .rpc_call_done = nfs_commit_done,
1912 .rpc_release = nfs_commit_release,
1913};
1914
1915static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1916 .completion = nfs_commit_release_pages,
1917 .resched_write = nfs_commit_resched_write,
1918};
1919
1920int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1921 int how, struct nfs_commit_info *cinfo)
1922{
1923 int status;
1924
1925 status = pnfs_commit_list(inode, head, how, cinfo);
1926 if (status == PNFS_NOT_ATTEMPTED)
1927 status = nfs_commit_list(inode, head, how, cinfo);
1928 return status;
1929}
1930
1931static int __nfs_commit_inode(struct inode *inode, int how,
1932 struct writeback_control *wbc)
1933{
1934 LIST_HEAD(head);
1935 struct nfs_commit_info cinfo;
1936 int may_wait = how & FLUSH_SYNC;
1937 int ret, nscan;
1938
1939 nfs_init_cinfo_from_inode(&cinfo, inode);
1940 nfs_commit_begin(cinfo.mds);
1941 for (;;) {
1942 ret = nscan = nfs_scan_commit(inode, &head, &cinfo);
1943 if (ret <= 0)
1944 break;
1945 ret = nfs_generic_commit_list(inode, &head, how, &cinfo);
1946 if (ret < 0)
1947 break;
1948 ret = 0;
1949 if (wbc && wbc->sync_mode == WB_SYNC_NONE) {
1950 if (nscan < wbc->nr_to_write)
1951 wbc->nr_to_write -= nscan;
1952 else
1953 wbc->nr_to_write = 0;
1954 }
1955 if (nscan < INT_MAX)
1956 break;
1957 cond_resched();
1958 }
1959 nfs_commit_end(cinfo.mds);
1960 if (ret || !may_wait)
1961 return ret;
1962 return wait_on_commit(cinfo.mds);
1963}
1964
1965int nfs_commit_inode(struct inode *inode, int how)
1966{
1967 return __nfs_commit_inode(inode, how, NULL);
1968}
1969EXPORT_SYMBOL_GPL(nfs_commit_inode);
1970
1971int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1972{
1973 struct nfs_inode *nfsi = NFS_I(inode);
1974 int flags = FLUSH_SYNC;
1975 int ret = 0;
1976
1977 if (wbc->sync_mode == WB_SYNC_NONE) {
1978
1979 if (!atomic_long_read(&nfsi->commit_info.ncommit))
1980 goto check_requests_outstanding;
1981
1982
1983
1984
1985 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1986 goto out_mark_dirty;
1987
1988
1989 flags = 0;
1990 }
1991
1992 ret = __nfs_commit_inode(inode, flags, wbc);
1993 if (!ret) {
1994 if (flags & FLUSH_SYNC)
1995 return 0;
1996 } else if (atomic_long_read(&nfsi->commit_info.ncommit))
1997 goto out_mark_dirty;
1998
1999check_requests_outstanding:
2000 if (!atomic_read(&nfsi->commit_info.rpcs_out))
2001 return ret;
2002out_mark_dirty:
2003 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
2004 return ret;
2005}
2006EXPORT_SYMBOL_GPL(nfs_write_inode);
2007
2008
2009
2010
2011
2012
2013
2014int nfs_filemap_write_and_wait_range(struct address_space *mapping,
2015 loff_t lstart, loff_t lend)
2016{
2017 int ret;
2018
2019 ret = filemap_write_and_wait_range(mapping, lstart, lend);
2020 if (ret == 0)
2021 ret = pnfs_sync_inode(mapping->host, true);
2022 return ret;
2023}
2024EXPORT_SYMBOL_GPL(nfs_filemap_write_and_wait_range);
2025
2026
2027
2028
2029int nfs_wb_all(struct inode *inode)
2030{
2031 int ret;
2032
2033 trace_nfs_writeback_inode_enter(inode);
2034
2035 ret = filemap_write_and_wait(inode->i_mapping);
2036 if (ret)
2037 goto out;
2038 ret = nfs_commit_inode(inode, FLUSH_SYNC);
2039 if (ret < 0)
2040 goto out;
2041 pnfs_sync_inode(inode, true);
2042 ret = 0;
2043
2044out:
2045 trace_nfs_writeback_inode_exit(inode, ret);
2046 return ret;
2047}
2048EXPORT_SYMBOL_GPL(nfs_wb_all);
2049
2050int nfs_wb_page_cancel(struct inode *inode, struct page *page)
2051{
2052 struct nfs_page *req;
2053 int ret = 0;
2054
2055 wait_on_page_writeback(page);
2056
2057
2058
2059 req = nfs_lock_and_join_requests(page);
2060
2061 if (IS_ERR(req)) {
2062 ret = PTR_ERR(req);
2063 } else if (req) {
2064
2065
2066
2067
2068 nfs_inode_remove_request(req);
2069 nfs_unlock_and_release_request(req);
2070 }
2071
2072 return ret;
2073}
2074
2075
2076
2077
2078int nfs_wb_page(struct inode *inode, struct page *page)
2079{
2080 loff_t range_start = page_file_offset(page);
2081 loff_t range_end = range_start + (loff_t)(PAGE_SIZE - 1);
2082 struct writeback_control wbc = {
2083 .sync_mode = WB_SYNC_ALL,
2084 .nr_to_write = 0,
2085 .range_start = range_start,
2086 .range_end = range_end,
2087 };
2088 int ret;
2089
2090 trace_nfs_writeback_page_enter(inode);
2091
2092 for (;;) {
2093 wait_on_page_writeback(page);
2094 if (clear_page_dirty_for_io(page)) {
2095 ret = nfs_writepage_locked(page, &wbc);
2096 if (ret < 0)
2097 goto out_error;
2098 continue;
2099 }
2100 ret = 0;
2101 if (!PagePrivate(page))
2102 break;
2103 ret = nfs_commit_inode(inode, FLUSH_SYNC);
2104 if (ret < 0)
2105 goto out_error;
2106 }
2107out_error:
2108 trace_nfs_writeback_page_exit(inode, ret);
2109 return ret;
2110}
2111
2112#ifdef CONFIG_MIGRATION
2113int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
2114 struct page *page, enum migrate_mode mode)
2115{
2116
2117
2118
2119
2120
2121
2122
2123
2124 if (PagePrivate(page))
2125 return -EBUSY;
2126
2127 if (!nfs_fscache_release_page(page, GFP_KERNEL))
2128 return -EBUSY;
2129
2130 return migrate_page(mapping, newpage, page, mode);
2131}
2132#endif
2133
2134int __init nfs_init_writepagecache(void)
2135{
2136 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
2137 sizeof(struct nfs_pgio_header),
2138 0, SLAB_HWCACHE_ALIGN,
2139 NULL);
2140 if (nfs_wdata_cachep == NULL)
2141 return -ENOMEM;
2142
2143 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
2144 nfs_wdata_cachep);
2145 if (nfs_wdata_mempool == NULL)
2146 goto out_destroy_write_cache;
2147
2148 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
2149 sizeof(struct nfs_commit_data),
2150 0, SLAB_HWCACHE_ALIGN,
2151 NULL);
2152 if (nfs_cdata_cachep == NULL)
2153 goto out_destroy_write_mempool;
2154
2155 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
2156 nfs_cdata_cachep);
2157 if (nfs_commit_mempool == NULL)
2158 goto out_destroy_commit_cache;
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176 nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10);
2177 if (nfs_congestion_kb > 256*1024)
2178 nfs_congestion_kb = 256*1024;
2179
2180 return 0;
2181
2182out_destroy_commit_cache:
2183 kmem_cache_destroy(nfs_cdata_cachep);
2184out_destroy_write_mempool:
2185 mempool_destroy(nfs_wdata_mempool);
2186out_destroy_write_cache:
2187 kmem_cache_destroy(nfs_wdata_cachep);
2188 return -ENOMEM;
2189}
2190
2191void nfs_destroy_writepagecache(void)
2192{
2193 mempool_destroy(nfs_commit_mempool);
2194 kmem_cache_destroy(nfs_cdata_cachep);
2195 mempool_destroy(nfs_wdata_mempool);
2196 kmem_cache_destroy(nfs_wdata_cachep);
2197}
2198
2199static const struct nfs_rw_ops nfs_rw_write_ops = {
2200 .rw_alloc_header = nfs_writehdr_alloc,
2201 .rw_free_header = nfs_writehdr_free,
2202 .rw_done = nfs_writeback_done,
2203 .rw_result = nfs_writeback_result,
2204 .rw_initiate = nfs_initiate_write,
2205};
2206