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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
25#include <asm/uaccess.h>
26
27#include "delegation.h"
28#include "internal.h"
29#include "iostat.h"
30#include "nfs4_fs.h"
31#include "fscache.h"
32#include "pnfs.h"
33
34#define NFSDBG_FACILITY NFSDBG_PAGECACHE
35
36#define MIN_POOL_WRITE (32)
37#define MIN_POOL_COMMIT (4)
38
39
40
41
42static void nfs_redirty_request(struct nfs_page *req);
43static const struct rpc_call_ops nfs_write_common_ops;
44static const struct rpc_call_ops nfs_commit_ops;
45static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
46static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
47
48static struct kmem_cache *nfs_wdata_cachep;
49static mempool_t *nfs_wdata_mempool;
50static struct kmem_cache *nfs_cdata_cachep;
51static mempool_t *nfs_commit_mempool;
52
53struct nfs_commit_data *nfs_commitdata_alloc(void)
54{
55 struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
56
57 if (p) {
58 memset(p, 0, sizeof(*p));
59 INIT_LIST_HEAD(&p->pages);
60 }
61 return p;
62}
63EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
64
65void nfs_commit_free(struct nfs_commit_data *p)
66{
67 mempool_free(p, nfs_commit_mempool);
68}
69EXPORT_SYMBOL_GPL(nfs_commit_free);
70
71struct nfs_write_header *nfs_writehdr_alloc(void)
72{
73 struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
74
75 if (p) {
76 struct nfs_pgio_header *hdr = &p->header;
77
78 memset(p, 0, sizeof(*p));
79 INIT_LIST_HEAD(&hdr->pages);
80 INIT_LIST_HEAD(&hdr->rpc_list);
81 spin_lock_init(&hdr->lock);
82 atomic_set(&hdr->refcnt, 0);
83 hdr->verf = &p->verf;
84 }
85 return p;
86}
87EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
88
89static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
90 unsigned int pagecount)
91{
92 struct nfs_write_data *data, *prealloc;
93
94 prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
95 if (prealloc->header == NULL)
96 data = prealloc;
97 else
98 data = kzalloc(sizeof(*data), GFP_KERNEL);
99 if (!data)
100 goto out;
101
102 if (nfs_pgarray_set(&data->pages, pagecount)) {
103 data->header = hdr;
104 atomic_inc(&hdr->refcnt);
105 } else {
106 if (data != prealloc)
107 kfree(data);
108 data = NULL;
109 }
110out:
111 return data;
112}
113
114void nfs_writehdr_free(struct nfs_pgio_header *hdr)
115{
116 struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
117 mempool_free(whdr, nfs_wdata_mempool);
118}
119EXPORT_SYMBOL_GPL(nfs_writehdr_free);
120
121void nfs_writedata_release(struct nfs_write_data *wdata)
122{
123 struct nfs_pgio_header *hdr = wdata->header;
124 struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
125
126 put_nfs_open_context(wdata->args.context);
127 if (wdata->pages.pagevec != wdata->pages.page_array)
128 kfree(wdata->pages.pagevec);
129 if (wdata == &write_header->rpc_data) {
130 wdata->header = NULL;
131 wdata = NULL;
132 }
133 if (atomic_dec_and_test(&hdr->refcnt))
134 hdr->completion_ops->completion(hdr);
135
136
137
138 kfree(wdata);
139}
140EXPORT_SYMBOL_GPL(nfs_writedata_release);
141
142static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
143{
144 ctx->error = error;
145 smp_wmb();
146 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
147}
148
149static struct nfs_page *
150nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page)
151{
152 struct nfs_page *req = NULL;
153
154 if (PagePrivate(page))
155 req = (struct nfs_page *)page_private(page);
156 else if (unlikely(PageSwapCache(page))) {
157 struct nfs_page *freq, *t;
158
159
160 list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) {
161 if (freq->wb_page == page) {
162 req = freq;
163 break;
164 }
165 }
166 }
167
168 if (req)
169 kref_get(&req->wb_kref);
170
171 return req;
172}
173
174static struct nfs_page *nfs_page_find_request(struct page *page)
175{
176 struct inode *inode = page_file_mapping(page)->host;
177 struct nfs_page *req = NULL;
178
179 spin_lock(&inode->i_lock);
180 req = nfs_page_find_request_locked(NFS_I(inode), page);
181 spin_unlock(&inode->i_lock);
182 return req;
183}
184
185
186static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
187{
188 struct inode *inode = page_file_mapping(page)->host;
189 loff_t end, i_size;
190 pgoff_t end_index;
191
192 spin_lock(&inode->i_lock);
193 i_size = i_size_read(inode);
194 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
195 if (i_size > 0 && page_file_index(page) < end_index)
196 goto out;
197 end = page_file_offset(page) + ((loff_t)offset+count);
198 if (i_size >= end)
199 goto out;
200 i_size_write(inode, end);
201 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
202out:
203 spin_unlock(&inode->i_lock);
204}
205
206
207static void nfs_set_pageerror(struct page *page)
208{
209 nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
210}
211
212
213
214
215static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
216{
217 if (PageUptodate(page))
218 return;
219 if (base != 0)
220 return;
221 if (count != nfs_page_length(page))
222 return;
223 SetPageUptodate(page);
224}
225
226static int wb_priority(struct writeback_control *wbc)
227{
228 if (wbc->for_reclaim)
229 return FLUSH_HIGHPRI | FLUSH_STABLE;
230 if (wbc->for_kupdate || wbc->for_background)
231 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
232 return FLUSH_COND_STABLE;
233}
234
235
236
237
238
239int nfs_congestion_kb;
240
241#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
242#define NFS_CONGESTION_OFF_THRESH \
243 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
244
245static void nfs_set_page_writeback(struct page *page)
246{
247 struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
248 int ret = test_set_page_writeback(page);
249
250 WARN_ON_ONCE(ret != 0);
251
252 if (atomic_long_inc_return(&nfss->writeback) >
253 NFS_CONGESTION_ON_THRESH) {
254 set_bdi_congested(&nfss->backing_dev_info,
255 BLK_RW_ASYNC);
256 }
257}
258
259static void nfs_end_page_writeback(struct page *page)
260{
261 struct inode *inode = page_file_mapping(page)->host;
262 struct nfs_server *nfss = NFS_SERVER(inode);
263
264 end_page_writeback(page);
265 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
266 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
267}
268
269static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
270{
271 struct inode *inode = page_file_mapping(page)->host;
272 struct nfs_page *req;
273 int ret;
274
275 spin_lock(&inode->i_lock);
276 for (;;) {
277 req = nfs_page_find_request_locked(NFS_I(inode), page);
278 if (req == NULL)
279 break;
280 if (nfs_lock_request(req))
281 break;
282
283
284
285
286
287 spin_unlock(&inode->i_lock);
288 if (!nonblock)
289 ret = nfs_wait_on_request(req);
290 else
291 ret = -EAGAIN;
292 nfs_release_request(req);
293 if (ret != 0)
294 return ERR_PTR(ret);
295 spin_lock(&inode->i_lock);
296 }
297 spin_unlock(&inode->i_lock);
298 return req;
299}
300
301
302
303
304
305static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
306 struct page *page, bool nonblock)
307{
308 struct nfs_page *req;
309 int ret = 0;
310
311 req = nfs_find_and_lock_request(page, nonblock);
312 if (!req)
313 goto out;
314 ret = PTR_ERR(req);
315 if (IS_ERR(req))
316 goto out;
317
318 nfs_set_page_writeback(page);
319 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
320
321 ret = 0;
322 if (!nfs_pageio_add_request(pgio, req)) {
323 nfs_redirty_request(req);
324 ret = pgio->pg_error;
325 }
326out:
327 return ret;
328}
329
330static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
331{
332 struct inode *inode = page_file_mapping(page)->host;
333 int ret;
334
335 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
336 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
337
338 nfs_pageio_cond_complete(pgio, page_file_index(page));
339 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
340 if (ret == -EAGAIN) {
341 redirty_page_for_writepage(wbc, page);
342 ret = 0;
343 }
344 return ret;
345}
346
347
348
349
350static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
351{
352 struct nfs_pageio_descriptor pgio;
353 int err;
354
355 NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
356 page->mapping->host,
357 wb_priority(wbc),
358 &nfs_async_write_completion_ops);
359 err = nfs_do_writepage(page, wbc, &pgio);
360 nfs_pageio_complete(&pgio);
361 if (err < 0)
362 return err;
363 if (pgio.pg_error < 0)
364 return pgio.pg_error;
365 return 0;
366}
367
368int nfs_writepage(struct page *page, struct writeback_control *wbc)
369{
370 int ret;
371
372 ret = nfs_writepage_locked(page, wbc);
373 unlock_page(page);
374 return ret;
375}
376
377static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
378{
379 int ret;
380
381 ret = nfs_do_writepage(page, wbc, data);
382 unlock_page(page);
383 return ret;
384}
385
386int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
387{
388 struct inode *inode = mapping->host;
389 unsigned long *bitlock = &NFS_I(inode)->flags;
390 struct nfs_pageio_descriptor pgio;
391 int err;
392
393
394 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
395 nfs_wait_bit_killable, TASK_KILLABLE);
396 if (err)
397 goto out_err;
398
399 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
400
401 NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
402 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
403 nfs_pageio_complete(&pgio);
404
405 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
406 smp_mb__after_clear_bit();
407 wake_up_bit(bitlock, NFS_INO_FLUSHING);
408
409 if (err < 0)
410 goto out_err;
411 err = pgio.pg_error;
412 if (err < 0)
413 goto out_err;
414 return 0;
415out_err:
416 return err;
417}
418
419
420
421
422static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
423{
424 struct nfs_inode *nfsi = NFS_I(inode);
425
426
427 nfs_lock_request(req);
428
429 spin_lock(&inode->i_lock);
430 if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
431 inode->i_version++;
432
433
434
435
436 if (likely(!PageSwapCache(req->wb_page))) {
437 set_bit(PG_MAPPED, &req->wb_flags);
438 SetPagePrivate(req->wb_page);
439 set_page_private(req->wb_page, (unsigned long)req);
440 }
441 nfsi->npages++;
442 kref_get(&req->wb_kref);
443 spin_unlock(&inode->i_lock);
444}
445
446
447
448
449static void nfs_inode_remove_request(struct nfs_page *req)
450{
451 struct inode *inode = req->wb_context->dentry->d_inode;
452 struct nfs_inode *nfsi = NFS_I(inode);
453
454 spin_lock(&inode->i_lock);
455 if (likely(!PageSwapCache(req->wb_page))) {
456 set_page_private(req->wb_page, 0);
457 ClearPagePrivate(req->wb_page);
458 clear_bit(PG_MAPPED, &req->wb_flags);
459 }
460 nfsi->npages--;
461 spin_unlock(&inode->i_lock);
462 nfs_release_request(req);
463}
464
465static void
466nfs_mark_request_dirty(struct nfs_page *req)
467{
468 __set_page_dirty_nobuffers(req->wb_page);
469}
470
471#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
472
473
474
475
476
477
478
479
480
481
482
483
484
485void
486nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
487 struct nfs_commit_info *cinfo)
488{
489 set_bit(PG_CLEAN, &(req)->wb_flags);
490 spin_lock(cinfo->lock);
491 nfs_list_add_request(req, dst);
492 cinfo->mds->ncommit++;
493 spin_unlock(cinfo->lock);
494 if (!cinfo->dreq) {
495 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
496 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
497 BDI_RECLAIMABLE);
498 __mark_inode_dirty(req->wb_context->dentry->d_inode,
499 I_DIRTY_DATASYNC);
500 }
501}
502EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
503
504
505
506
507
508
509
510
511
512
513
514
515void
516nfs_request_remove_commit_list(struct nfs_page *req,
517 struct nfs_commit_info *cinfo)
518{
519 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
520 return;
521 nfs_list_remove_request(req);
522 cinfo->mds->ncommit--;
523}
524EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
525
526static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
527 struct inode *inode)
528{
529 cinfo->lock = &inode->i_lock;
530 cinfo->mds = &NFS_I(inode)->commit_info;
531 cinfo->ds = pnfs_get_ds_info(inode);
532 cinfo->dreq = NULL;
533 cinfo->completion_ops = &nfs_commit_completion_ops;
534}
535
536void nfs_init_cinfo(struct nfs_commit_info *cinfo,
537 struct inode *inode,
538 struct nfs_direct_req *dreq)
539{
540 if (dreq)
541 nfs_init_cinfo_from_dreq(cinfo, dreq);
542 else
543 nfs_init_cinfo_from_inode(cinfo, inode);
544}
545EXPORT_SYMBOL_GPL(nfs_init_cinfo);
546
547
548
549
550void
551nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
552 struct nfs_commit_info *cinfo)
553{
554 if (pnfs_mark_request_commit(req, lseg, cinfo))
555 return;
556 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
557}
558
559static void
560nfs_clear_page_commit(struct page *page)
561{
562 dec_zone_page_state(page, NR_UNSTABLE_NFS);
563 dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
564}
565
566static void
567nfs_clear_request_commit(struct nfs_page *req)
568{
569 if (test_bit(PG_CLEAN, &req->wb_flags)) {
570 struct inode *inode = req->wb_context->dentry->d_inode;
571 struct nfs_commit_info cinfo;
572
573 nfs_init_cinfo_from_inode(&cinfo, inode);
574 if (!pnfs_clear_request_commit(req, &cinfo)) {
575 spin_lock(cinfo.lock);
576 nfs_request_remove_commit_list(req, &cinfo);
577 spin_unlock(cinfo.lock);
578 }
579 nfs_clear_page_commit(req->wb_page);
580 }
581}
582
583static inline
584int nfs_write_need_commit(struct nfs_write_data *data)
585{
586 if (data->verf.committed == NFS_DATA_SYNC)
587 return data->header->lseg == NULL;
588 return data->verf.committed != NFS_FILE_SYNC;
589}
590
591#else
592static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
593 struct inode *inode)
594{
595}
596
597void nfs_init_cinfo(struct nfs_commit_info *cinfo,
598 struct inode *inode,
599 struct nfs_direct_req *dreq)
600{
601}
602
603void
604nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
605 struct nfs_commit_info *cinfo)
606{
607}
608
609static void
610nfs_clear_request_commit(struct nfs_page *req)
611{
612}
613
614static inline
615int nfs_write_need_commit(struct nfs_write_data *data)
616{
617 return 0;
618}
619
620#endif
621
622static void nfs_write_completion(struct nfs_pgio_header *hdr)
623{
624 struct nfs_commit_info cinfo;
625 unsigned long bytes = 0;
626
627 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
628 goto out;
629 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
630 while (!list_empty(&hdr->pages)) {
631 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
632
633 bytes += req->wb_bytes;
634 nfs_list_remove_request(req);
635 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
636 (hdr->good_bytes < bytes)) {
637 nfs_set_pageerror(req->wb_page);
638 nfs_context_set_write_error(req->wb_context, hdr->error);
639 goto remove_req;
640 }
641 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
642 nfs_mark_request_dirty(req);
643 goto next;
644 }
645 if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
646 memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf));
647 nfs_mark_request_commit(req, hdr->lseg, &cinfo);
648 goto next;
649 }
650remove_req:
651 nfs_inode_remove_request(req);
652next:
653 nfs_unlock_request(req);
654 nfs_end_page_writeback(req->wb_page);
655 nfs_release_request(req);
656 }
657out:
658 hdr->release(hdr);
659}
660
661#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
662static unsigned long
663nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
664{
665 return cinfo->mds->ncommit;
666}
667
668
669int
670nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
671 struct nfs_commit_info *cinfo, int max)
672{
673 struct nfs_page *req, *tmp;
674 int ret = 0;
675
676 list_for_each_entry_safe(req, tmp, src, wb_list) {
677 if (!nfs_lock_request(req))
678 continue;
679 kref_get(&req->wb_kref);
680 if (cond_resched_lock(cinfo->lock))
681 list_safe_reset_next(req, tmp, wb_list);
682 nfs_request_remove_commit_list(req, cinfo);
683 nfs_list_add_request(req, dst);
684 ret++;
685 if ((ret == max) && !cinfo->dreq)
686 break;
687 }
688 return ret;
689}
690
691
692
693
694
695
696
697
698
699
700int
701nfs_scan_commit(struct inode *inode, struct list_head *dst,
702 struct nfs_commit_info *cinfo)
703{
704 int ret = 0;
705
706 spin_lock(cinfo->lock);
707 if (cinfo->mds->ncommit > 0) {
708 const int max = INT_MAX;
709
710 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
711 cinfo, max);
712 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
713 }
714 spin_unlock(cinfo->lock);
715 return ret;
716}
717
718#else
719static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
720{
721 return 0;
722}
723
724int nfs_scan_commit(struct inode *inode, struct list_head *dst,
725 struct nfs_commit_info *cinfo)
726{
727 return 0;
728}
729#endif
730
731
732
733
734
735
736
737
738static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
739 struct page *page,
740 unsigned int offset,
741 unsigned int bytes)
742{
743 struct nfs_page *req;
744 unsigned int rqend;
745 unsigned int end;
746 int error;
747
748 if (!PagePrivate(page))
749 return NULL;
750
751 end = offset + bytes;
752 spin_lock(&inode->i_lock);
753
754 for (;;) {
755 req = nfs_page_find_request_locked(NFS_I(inode), page);
756 if (req == NULL)
757 goto out_unlock;
758
759 rqend = req->wb_offset + req->wb_bytes;
760
761
762
763
764
765
766 if (offset > rqend
767 || end < req->wb_offset)
768 goto out_flushme;
769
770 if (nfs_lock_request(req))
771 break;
772
773
774 spin_unlock(&inode->i_lock);
775 error = nfs_wait_on_request(req);
776 nfs_release_request(req);
777 if (error != 0)
778 goto out_err;
779 spin_lock(&inode->i_lock);
780 }
781
782
783 if (offset < req->wb_offset) {
784 req->wb_offset = offset;
785 req->wb_pgbase = offset;
786 }
787 if (end > rqend)
788 req->wb_bytes = end - req->wb_offset;
789 else
790 req->wb_bytes = rqend - req->wb_offset;
791out_unlock:
792 spin_unlock(&inode->i_lock);
793 if (req)
794 nfs_clear_request_commit(req);
795 return req;
796out_flushme:
797 spin_unlock(&inode->i_lock);
798 nfs_release_request(req);
799 error = nfs_wb_page(inode, page);
800out_err:
801 return ERR_PTR(error);
802}
803
804
805
806
807
808
809
810
811static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
812 struct page *page, unsigned int offset, unsigned int bytes)
813{
814 struct inode *inode = page_file_mapping(page)->host;
815 struct nfs_page *req;
816
817 req = nfs_try_to_update_request(inode, page, offset, bytes);
818 if (req != NULL)
819 goto out;
820 req = nfs_create_request(ctx, inode, page, offset, bytes);
821 if (IS_ERR(req))
822 goto out;
823 nfs_inode_add_request(inode, req);
824out:
825 return req;
826}
827
828static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
829 unsigned int offset, unsigned int count)
830{
831 struct nfs_page *req;
832
833 req = nfs_setup_write_request(ctx, page, offset, count);
834 if (IS_ERR(req))
835 return PTR_ERR(req);
836
837 nfs_grow_file(page, offset, count);
838 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
839 nfs_mark_request_dirty(req);
840 nfs_unlock_and_release_request(req);
841 return 0;
842}
843
844int nfs_flush_incompatible(struct file *file, struct page *page)
845{
846 struct nfs_open_context *ctx = nfs_file_open_context(file);
847 struct nfs_lock_context *l_ctx;
848 struct nfs_page *req;
849 int do_flush, status;
850
851
852
853
854
855
856
857
858 do {
859 req = nfs_page_find_request(page);
860 if (req == NULL)
861 return 0;
862 l_ctx = req->wb_lock_context;
863 do_flush = req->wb_page != page || req->wb_context != ctx;
864 if (l_ctx) {
865 do_flush |= l_ctx->lockowner.l_owner != current->files
866 || l_ctx->lockowner.l_pid != current->tgid;
867 }
868 nfs_release_request(req);
869 if (!do_flush)
870 return 0;
871 status = nfs_wb_page(page_file_mapping(page)->host, page);
872 } while (status == 0);
873 return status;
874}
875
876
877
878
879
880
881static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
882{
883 if (nfs_have_delegated_attributes(inode))
884 goto out;
885 if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE))
886 return false;
887out:
888 return PageUptodate(page) != 0;
889}
890
891
892
893
894
895
896
897
898
899static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
900{
901 if (file->f_flags & O_DSYNC)
902 return 0;
903 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
904 return 1;
905 if (nfs_write_pageuptodate(page, inode) && (inode->i_flock == NULL ||
906 (inode->i_flock->fl_start == 0 &&
907 inode->i_flock->fl_end == OFFSET_MAX &&
908 inode->i_flock->fl_type != F_RDLCK)))
909 return 1;
910 return 0;
911}
912
913
914
915
916
917
918
919int nfs_updatepage(struct file *file, struct page *page,
920 unsigned int offset, unsigned int count)
921{
922 struct nfs_open_context *ctx = nfs_file_open_context(file);
923 struct inode *inode = page_file_mapping(page)->host;
924 int status = 0;
925
926 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
927
928 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
929 file->f_path.dentry->d_parent->d_name.name,
930 file->f_path.dentry->d_name.name, count,
931 (long long)(page_file_offset(page) + offset));
932
933 if (nfs_can_extend_write(file, page, inode)) {
934 count = max(count + offset, nfs_page_length(page));
935 offset = 0;
936 }
937
938 status = nfs_writepage_setup(ctx, page, offset, count);
939 if (status < 0)
940 nfs_set_pageerror(page);
941 else
942 __set_page_dirty_nobuffers(page);
943
944 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
945 status, (long long)i_size_read(inode));
946 return status;
947}
948
949static int flush_task_priority(int how)
950{
951 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
952 case FLUSH_HIGHPRI:
953 return RPC_PRIORITY_HIGH;
954 case FLUSH_LOWPRI:
955 return RPC_PRIORITY_LOW;
956 }
957 return RPC_PRIORITY_NORMAL;
958}
959
960int nfs_initiate_write(struct rpc_clnt *clnt,
961 struct nfs_write_data *data,
962 const struct rpc_call_ops *call_ops,
963 int how, int flags)
964{
965 struct inode *inode = data->header->inode;
966 int priority = flush_task_priority(how);
967 struct rpc_task *task;
968 struct rpc_message msg = {
969 .rpc_argp = &data->args,
970 .rpc_resp = &data->res,
971 .rpc_cred = data->header->cred,
972 };
973 struct rpc_task_setup task_setup_data = {
974 .rpc_client = clnt,
975 .task = &data->task,
976 .rpc_message = &msg,
977 .callback_ops = call_ops,
978 .callback_data = data,
979 .workqueue = nfsiod_workqueue,
980 .flags = RPC_TASK_ASYNC | flags,
981 .priority = priority,
982 };
983 int ret = 0;
984
985
986 NFS_PROTO(inode)->write_setup(data, &msg);
987
988 dprintk("NFS: %5u initiated write call "
989 "(req %s/%lld, %u bytes @ offset %llu)\n",
990 data->task.tk_pid,
991 inode->i_sb->s_id,
992 (long long)NFS_FILEID(inode),
993 data->args.count,
994 (unsigned long long)data->args.offset);
995
996 task = rpc_run_task(&task_setup_data);
997 if (IS_ERR(task)) {
998 ret = PTR_ERR(task);
999 goto out;
1000 }
1001 if (how & FLUSH_SYNC) {
1002 ret = rpc_wait_for_completion_task(task);
1003 if (ret == 0)
1004 ret = task->tk_status;
1005 }
1006 rpc_put_task(task);
1007out:
1008 return ret;
1009}
1010EXPORT_SYMBOL_GPL(nfs_initiate_write);
1011
1012
1013
1014
1015static void nfs_write_rpcsetup(struct nfs_write_data *data,
1016 unsigned int count, unsigned int offset,
1017 int how, struct nfs_commit_info *cinfo)
1018{
1019 struct nfs_page *req = data->header->req;
1020
1021
1022
1023
1024 data->args.fh = NFS_FH(data->header->inode);
1025 data->args.offset = req_offset(req) + offset;
1026
1027 data->mds_offset = data->args.offset;
1028 data->args.pgbase = req->wb_pgbase + offset;
1029 data->args.pages = data->pages.pagevec;
1030 data->args.count = count;
1031 data->args.context = get_nfs_open_context(req->wb_context);
1032 data->args.lock_context = req->wb_lock_context;
1033 data->args.stable = NFS_UNSTABLE;
1034 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
1035 case 0:
1036 break;
1037 case FLUSH_COND_STABLE:
1038 if (nfs_reqs_to_commit(cinfo))
1039 break;
1040 default:
1041 data->args.stable = NFS_FILE_SYNC;
1042 }
1043
1044 data->res.fattr = &data->fattr;
1045 data->res.count = count;
1046 data->res.verf = &data->verf;
1047 nfs_fattr_init(&data->fattr);
1048}
1049
1050static int nfs_do_write(struct nfs_write_data *data,
1051 const struct rpc_call_ops *call_ops,
1052 int how)
1053{
1054 struct inode *inode = data->header->inode;
1055
1056 return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0);
1057}
1058
1059static int nfs_do_multiple_writes(struct list_head *head,
1060 const struct rpc_call_ops *call_ops,
1061 int how)
1062{
1063 struct nfs_write_data *data;
1064 int ret = 0;
1065
1066 while (!list_empty(head)) {
1067 int ret2;
1068
1069 data = list_first_entry(head, struct nfs_write_data, list);
1070 list_del_init(&data->list);
1071
1072 ret2 = nfs_do_write(data, call_ops, how);
1073 if (ret == 0)
1074 ret = ret2;
1075 }
1076 return ret;
1077}
1078
1079
1080
1081
1082
1083static void nfs_redirty_request(struct nfs_page *req)
1084{
1085 nfs_mark_request_dirty(req);
1086 nfs_unlock_request(req);
1087 nfs_end_page_writeback(req->wb_page);
1088 nfs_release_request(req);
1089}
1090
1091static void nfs_async_write_error(struct list_head *head)
1092{
1093 struct nfs_page *req;
1094
1095 while (!list_empty(head)) {
1096 req = nfs_list_entry(head->next);
1097 nfs_list_remove_request(req);
1098 nfs_redirty_request(req);
1099 }
1100}
1101
1102static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1103 .error_cleanup = nfs_async_write_error,
1104 .completion = nfs_write_completion,
1105};
1106
1107static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
1108 struct nfs_pgio_header *hdr)
1109{
1110 set_bit(NFS_IOHDR_REDO, &hdr->flags);
1111 while (!list_empty(&hdr->rpc_list)) {
1112 struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
1113 struct nfs_write_data, list);
1114 list_del(&data->list);
1115 nfs_writedata_release(data);
1116 }
1117 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1118}
1119
1120
1121
1122
1123
1124static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
1125 struct nfs_pgio_header *hdr)
1126{
1127 struct nfs_page *req = hdr->req;
1128 struct page *page = req->wb_page;
1129 struct nfs_write_data *data;
1130 size_t wsize = desc->pg_bsize, nbytes;
1131 unsigned int offset;
1132 int requests = 0;
1133 struct nfs_commit_info cinfo;
1134
1135 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
1136
1137 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
1138 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
1139 desc->pg_count > wsize))
1140 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1141
1142
1143 offset = 0;
1144 nbytes = desc->pg_count;
1145 do {
1146 size_t len = min(nbytes, wsize);
1147
1148 data = nfs_writedata_alloc(hdr, 1);
1149 if (!data) {
1150 nfs_flush_error(desc, hdr);
1151 return -ENOMEM;
1152 }
1153 data->pages.pagevec[0] = page;
1154 nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
1155 list_add(&data->list, &hdr->rpc_list);
1156 requests++;
1157 nbytes -= len;
1158 offset += len;
1159 } while (nbytes != 0);
1160 nfs_list_remove_request(req);
1161 nfs_list_add_request(req, &hdr->pages);
1162 desc->pg_rpc_callops = &nfs_write_common_ops;
1163 return 0;
1164}
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
1175 struct nfs_pgio_header *hdr)
1176{
1177 struct nfs_page *req;
1178 struct page **pages;
1179 struct nfs_write_data *data;
1180 struct list_head *head = &desc->pg_list;
1181 struct nfs_commit_info cinfo;
1182
1183 data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
1184 desc->pg_count));
1185 if (!data) {
1186 nfs_flush_error(desc, hdr);
1187 return -ENOMEM;
1188 }
1189
1190 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
1191 pages = data->pages.pagevec;
1192 while (!list_empty(head)) {
1193 req = nfs_list_entry(head->next);
1194 nfs_list_remove_request(req);
1195 nfs_list_add_request(req, &hdr->pages);
1196 *pages++ = req->wb_page;
1197 }
1198
1199 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
1200 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
1201 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1202
1203
1204 nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
1205 list_add(&data->list, &hdr->rpc_list);
1206 desc->pg_rpc_callops = &nfs_write_common_ops;
1207 return 0;
1208}
1209
1210int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
1211 struct nfs_pgio_header *hdr)
1212{
1213 if (desc->pg_bsize < PAGE_CACHE_SIZE)
1214 return nfs_flush_multi(desc, hdr);
1215 return nfs_flush_one(desc, hdr);
1216}
1217EXPORT_SYMBOL_GPL(nfs_generic_flush);
1218
1219static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1220{
1221 struct nfs_write_header *whdr;
1222 struct nfs_pgio_header *hdr;
1223 int ret;
1224
1225 whdr = nfs_writehdr_alloc();
1226 if (!whdr) {
1227 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1228 return -ENOMEM;
1229 }
1230 hdr = &whdr->header;
1231 nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
1232 atomic_inc(&hdr->refcnt);
1233 ret = nfs_generic_flush(desc, hdr);
1234 if (ret == 0)
1235 ret = nfs_do_multiple_writes(&hdr->rpc_list,
1236 desc->pg_rpc_callops,
1237 desc->pg_ioflags);
1238 if (atomic_dec_and_test(&hdr->refcnt))
1239 hdr->completion_ops->completion(hdr);
1240 return ret;
1241}
1242
1243static const struct nfs_pageio_ops nfs_pageio_write_ops = {
1244 .pg_test = nfs_generic_pg_test,
1245 .pg_doio = nfs_generic_pg_writepages,
1246};
1247
1248void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1249 struct inode *inode, int ioflags,
1250 const struct nfs_pgio_completion_ops *compl_ops)
1251{
1252 nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
1253 NFS_SERVER(inode)->wsize, ioflags);
1254}
1255EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
1256
1257void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1258{
1259 pgio->pg_ops = &nfs_pageio_write_ops;
1260 pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1261}
1262EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
1263
1264
1265void nfs_write_prepare(struct rpc_task *task, void *calldata)
1266{
1267 struct nfs_write_data *data = calldata;
1268 NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
1269 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
1270 rpc_exit(task, -EIO);
1271}
1272
1273void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1274{
1275 struct nfs_commit_data *data = calldata;
1276
1277 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1278}
1279
1280
1281
1282
1283
1284
1285
1286
1287static void nfs_writeback_done_common(struct rpc_task *task, void *calldata)
1288{
1289 struct nfs_write_data *data = calldata;
1290
1291 nfs_writeback_done(task, data);
1292}
1293
1294static void nfs_writeback_release_common(void *calldata)
1295{
1296 struct nfs_write_data *data = calldata;
1297 struct nfs_pgio_header *hdr = data->header;
1298 int status = data->task.tk_status;
1299
1300 if ((status >= 0) && nfs_write_need_commit(data)) {
1301 spin_lock(&hdr->lock);
1302 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
1303 ;
1304 else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
1305 memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
1306 else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
1307 set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
1308 spin_unlock(&hdr->lock);
1309 }
1310 nfs_writedata_release(data);
1311}
1312
1313static const struct rpc_call_ops nfs_write_common_ops = {
1314 .rpc_call_prepare = nfs_write_prepare,
1315 .rpc_call_done = nfs_writeback_done_common,
1316 .rpc_release = nfs_writeback_release_common,
1317};
1318
1319
1320
1321
1322
1323void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
1324{
1325 struct nfs_writeargs *argp = &data->args;
1326 struct nfs_writeres *resp = &data->res;
1327 struct inode *inode = data->header->inode;
1328 int status;
1329
1330 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1331 task->tk_pid, task->tk_status);
1332
1333
1334
1335
1336
1337
1338
1339
1340 status = NFS_PROTO(inode)->write_done(task, data);
1341 if (status != 0)
1342 return;
1343 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1344
1345#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
1346 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1347
1348
1349
1350
1351
1352
1353
1354
1355 static unsigned long complain;
1356
1357
1358 if (time_before(complain, jiffies)) {
1359 dprintk("NFS: faulty NFS server %s:"
1360 " (committed = %d) != (stable = %d)\n",
1361 NFS_SERVER(inode)->nfs_client->cl_hostname,
1362 resp->verf->committed, argp->stable);
1363 complain = jiffies + 300 * HZ;
1364 }
1365 }
1366#endif
1367 if (task->tk_status < 0)
1368 nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
1369 else if (resp->count < argp->count) {
1370 static unsigned long complain;
1371
1372
1373 nfs_inc_stats(inode, NFSIOS_SHORTWRITE);
1374
1375
1376 if (resp->count == 0) {
1377 if (time_before(complain, jiffies)) {
1378 printk(KERN_WARNING
1379 "NFS: Server wrote zero bytes, expected %u.\n",
1380 argp->count);
1381 complain = jiffies + 300 * HZ;
1382 }
1383 nfs_set_pgio_error(data->header, -EIO, argp->offset);
1384 task->tk_status = -EIO;
1385 return;
1386 }
1387
1388 if (resp->verf->committed != NFS_UNSTABLE) {
1389
1390 data->mds_offset += resp->count;
1391 argp->offset += resp->count;
1392 argp->pgbase += resp->count;
1393 argp->count -= resp->count;
1394 } else {
1395
1396
1397
1398 argp->stable = NFS_FILE_SYNC;
1399 }
1400 rpc_restart_call_prepare(task);
1401 }
1402}
1403
1404
1405#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
1406static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1407{
1408 int ret;
1409
1410 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1411 return 1;
1412 if (!may_wait)
1413 return 0;
1414 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1415 NFS_INO_COMMIT,
1416 nfs_wait_bit_killable,
1417 TASK_KILLABLE);
1418 return (ret < 0) ? ret : 1;
1419}
1420
1421static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
1422{
1423 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1424 smp_mb__after_clear_bit();
1425 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1426}
1427
1428void nfs_commitdata_release(struct nfs_commit_data *data)
1429{
1430 put_nfs_open_context(data->context);
1431 nfs_commit_free(data);
1432}
1433EXPORT_SYMBOL_GPL(nfs_commitdata_release);
1434
1435int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
1436 const struct rpc_call_ops *call_ops,
1437 int how, int flags)
1438{
1439 struct rpc_task *task;
1440 int priority = flush_task_priority(how);
1441 struct rpc_message msg = {
1442 .rpc_argp = &data->args,
1443 .rpc_resp = &data->res,
1444 .rpc_cred = data->cred,
1445 };
1446 struct rpc_task_setup task_setup_data = {
1447 .task = &data->task,
1448 .rpc_client = clnt,
1449 .rpc_message = &msg,
1450 .callback_ops = call_ops,
1451 .callback_data = data,
1452 .workqueue = nfsiod_workqueue,
1453 .flags = RPC_TASK_ASYNC | flags,
1454 .priority = priority,
1455 };
1456
1457 NFS_PROTO(data->inode)->commit_setup(data, &msg);
1458
1459 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
1460
1461 task = rpc_run_task(&task_setup_data);
1462 if (IS_ERR(task))
1463 return PTR_ERR(task);
1464 if (how & FLUSH_SYNC)
1465 rpc_wait_for_completion_task(task);
1466 rpc_put_task(task);
1467 return 0;
1468}
1469EXPORT_SYMBOL_GPL(nfs_initiate_commit);
1470
1471
1472
1473
1474void nfs_init_commit(struct nfs_commit_data *data,
1475 struct list_head *head,
1476 struct pnfs_layout_segment *lseg,
1477 struct nfs_commit_info *cinfo)
1478{
1479 struct nfs_page *first = nfs_list_entry(head->next);
1480 struct inode *inode = first->wb_context->dentry->d_inode;
1481
1482
1483
1484
1485 list_splice_init(head, &data->pages);
1486
1487 data->inode = inode;
1488 data->cred = first->wb_context->cred;
1489 data->lseg = lseg;
1490 data->mds_ops = &nfs_commit_ops;
1491 data->completion_ops = cinfo->completion_ops;
1492 data->dreq = cinfo->dreq;
1493
1494 data->args.fh = NFS_FH(data->inode);
1495
1496 data->args.offset = 0;
1497 data->args.count = 0;
1498 data->context = get_nfs_open_context(first->wb_context);
1499 data->res.fattr = &data->fattr;
1500 data->res.verf = &data->verf;
1501 nfs_fattr_init(&data->fattr);
1502}
1503EXPORT_SYMBOL_GPL(nfs_init_commit);
1504
1505void nfs_retry_commit(struct list_head *page_list,
1506 struct pnfs_layout_segment *lseg,
1507 struct nfs_commit_info *cinfo)
1508{
1509 struct nfs_page *req;
1510
1511 while (!list_empty(page_list)) {
1512 req = nfs_list_entry(page_list->next);
1513 nfs_list_remove_request(req);
1514 nfs_mark_request_commit(req, lseg, cinfo);
1515 if (!cinfo->dreq) {
1516 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1517 dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
1518 BDI_RECLAIMABLE);
1519 }
1520 nfs_unlock_and_release_request(req);
1521 }
1522}
1523EXPORT_SYMBOL_GPL(nfs_retry_commit);
1524
1525
1526
1527
1528static int
1529nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1530 struct nfs_commit_info *cinfo)
1531{
1532 struct nfs_commit_data *data;
1533
1534 data = nfs_commitdata_alloc();
1535
1536 if (!data)
1537 goto out_bad;
1538
1539
1540 nfs_init_commit(data, head, NULL, cinfo);
1541 atomic_inc(&cinfo->mds->rpcs_out);
1542 return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops,
1543 how, 0);
1544 out_bad:
1545 nfs_retry_commit(head, NULL, cinfo);
1546 cinfo->completion_ops->error_cleanup(NFS_I(inode));
1547 return -ENOMEM;
1548}
1549
1550
1551
1552
1553static void nfs_commit_done(struct rpc_task *task, void *calldata)
1554{
1555 struct nfs_commit_data *data = calldata;
1556
1557 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1558 task->tk_pid, task->tk_status);
1559
1560
1561 NFS_PROTO(data->inode)->commit_done(task, data);
1562}
1563
1564static void nfs_commit_release_pages(struct nfs_commit_data *data)
1565{
1566 struct nfs_page *req;
1567 int status = data->task.tk_status;
1568 struct nfs_commit_info cinfo;
1569
1570 while (!list_empty(&data->pages)) {
1571 req = nfs_list_entry(data->pages.next);
1572 nfs_list_remove_request(req);
1573 nfs_clear_page_commit(req->wb_page);
1574
1575 dprintk("NFS: commit (%s/%lld %d@%lld)",
1576 req->wb_context->dentry->d_sb->s_id,
1577 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1578 req->wb_bytes,
1579 (long long)req_offset(req));
1580 if (status < 0) {
1581 nfs_context_set_write_error(req->wb_context, status);
1582 nfs_inode_remove_request(req);
1583 dprintk(", error = %d\n", status);
1584 goto next;
1585 }
1586
1587
1588
1589 if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) {
1590
1591 nfs_inode_remove_request(req);
1592 dprintk(" OK\n");
1593 goto next;
1594 }
1595
1596 dprintk(" mismatch\n");
1597 nfs_mark_request_dirty(req);
1598 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
1599 next:
1600 nfs_unlock_and_release_request(req);
1601 }
1602 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1603 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
1604 nfs_commit_clear_lock(NFS_I(data->inode));
1605}
1606
1607static void nfs_commit_release(void *calldata)
1608{
1609 struct nfs_commit_data *data = calldata;
1610
1611 data->completion_ops->completion(data);
1612 nfs_commitdata_release(calldata);
1613}
1614
1615static const struct rpc_call_ops nfs_commit_ops = {
1616 .rpc_call_prepare = nfs_commit_prepare,
1617 .rpc_call_done = nfs_commit_done,
1618 .rpc_release = nfs_commit_release,
1619};
1620
1621static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1622 .completion = nfs_commit_release_pages,
1623 .error_cleanup = nfs_commit_clear_lock,
1624};
1625
1626int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1627 int how, struct nfs_commit_info *cinfo)
1628{
1629 int status;
1630
1631 status = pnfs_commit_list(inode, head, how, cinfo);
1632 if (status == PNFS_NOT_ATTEMPTED)
1633 status = nfs_commit_list(inode, head, how, cinfo);
1634 return status;
1635}
1636
1637int nfs_commit_inode(struct inode *inode, int how)
1638{
1639 LIST_HEAD(head);
1640 struct nfs_commit_info cinfo;
1641 int may_wait = how & FLUSH_SYNC;
1642 int res;
1643
1644 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1645 if (res <= 0)
1646 goto out_mark_dirty;
1647 nfs_init_cinfo_from_inode(&cinfo, inode);
1648 res = nfs_scan_commit(inode, &head, &cinfo);
1649 if (res) {
1650 int error;
1651
1652 error = nfs_generic_commit_list(inode, &head, how, &cinfo);
1653 if (error < 0)
1654 return error;
1655 if (!may_wait)
1656 goto out_mark_dirty;
1657 error = wait_on_bit(&NFS_I(inode)->flags,
1658 NFS_INO_COMMIT,
1659 nfs_wait_bit_killable,
1660 TASK_KILLABLE);
1661 if (error < 0)
1662 return error;
1663 } else
1664 nfs_commit_clear_lock(NFS_I(inode));
1665 return res;
1666
1667
1668
1669
1670
1671out_mark_dirty:
1672 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1673 return res;
1674}
1675
1676static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1677{
1678 struct nfs_inode *nfsi = NFS_I(inode);
1679 int flags = FLUSH_SYNC;
1680 int ret = 0;
1681
1682
1683 if (!nfsi->commit_info.ncommit)
1684 return ret;
1685
1686 if (wbc->sync_mode == WB_SYNC_NONE) {
1687
1688
1689
1690 if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
1691 goto out_mark_dirty;
1692
1693
1694 flags = 0;
1695 }
1696
1697 ret = nfs_commit_inode(inode, flags);
1698 if (ret >= 0) {
1699 if (wbc->sync_mode == WB_SYNC_NONE) {
1700 if (ret < wbc->nr_to_write)
1701 wbc->nr_to_write -= ret;
1702 else
1703 wbc->nr_to_write = 0;
1704 }
1705 return 0;
1706 }
1707out_mark_dirty:
1708 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1709 return ret;
1710}
1711#else
1712static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1713{
1714 return 0;
1715}
1716#endif
1717
1718int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1719{
1720 return nfs_commit_unstable_pages(inode, wbc);
1721}
1722EXPORT_SYMBOL_GPL(nfs_write_inode);
1723
1724
1725
1726
1727int nfs_wb_all(struct inode *inode)
1728{
1729 struct writeback_control wbc = {
1730 .sync_mode = WB_SYNC_ALL,
1731 .nr_to_write = LONG_MAX,
1732 .range_start = 0,
1733 .range_end = LLONG_MAX,
1734 };
1735
1736 return sync_inode(inode, &wbc);
1737}
1738EXPORT_SYMBOL_GPL(nfs_wb_all);
1739
1740int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1741{
1742 struct nfs_page *req;
1743 int ret = 0;
1744
1745 for (;;) {
1746 wait_on_page_writeback(page);
1747 req = nfs_page_find_request(page);
1748 if (req == NULL)
1749 break;
1750 if (nfs_lock_request(req)) {
1751 nfs_clear_request_commit(req);
1752 nfs_inode_remove_request(req);
1753
1754
1755
1756
1757 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1758 nfs_unlock_and_release_request(req);
1759 break;
1760 }
1761 ret = nfs_wait_on_request(req);
1762 nfs_release_request(req);
1763 if (ret < 0)
1764 break;
1765 }
1766 return ret;
1767}
1768
1769
1770
1771
1772int nfs_wb_page(struct inode *inode, struct page *page)
1773{
1774 loff_t range_start = page_file_offset(page);
1775 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
1776 struct writeback_control wbc = {
1777 .sync_mode = WB_SYNC_ALL,
1778 .nr_to_write = 0,
1779 .range_start = range_start,
1780 .range_end = range_end,
1781 };
1782 int ret;
1783
1784 for (;;) {
1785 wait_on_page_writeback(page);
1786 if (clear_page_dirty_for_io(page)) {
1787 ret = nfs_writepage_locked(page, &wbc);
1788 if (ret < 0)
1789 goto out_error;
1790 continue;
1791 }
1792 if (!PagePrivate(page))
1793 break;
1794 ret = nfs_commit_inode(inode, FLUSH_SYNC);
1795 if (ret < 0)
1796 goto out_error;
1797 }
1798 return 0;
1799out_error:
1800 return ret;
1801}
1802
1803#ifdef CONFIG_MIGRATION
1804int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
1805 struct page *page, enum migrate_mode mode)
1806{
1807
1808
1809
1810
1811
1812
1813
1814
1815 if (PagePrivate(page))
1816 return -EBUSY;
1817
1818 if (!nfs_fscache_release_page(page, GFP_KERNEL))
1819 return -EBUSY;
1820
1821 return migrate_page(mapping, newpage, page, mode);
1822}
1823#endif
1824
1825int __init nfs_init_writepagecache(void)
1826{
1827 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1828 sizeof(struct nfs_write_header),
1829 0, SLAB_HWCACHE_ALIGN,
1830 NULL);
1831 if (nfs_wdata_cachep == NULL)
1832 return -ENOMEM;
1833
1834 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1835 nfs_wdata_cachep);
1836 if (nfs_wdata_mempool == NULL)
1837 goto out_destroy_write_cache;
1838
1839 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
1840 sizeof(struct nfs_commit_data),
1841 0, SLAB_HWCACHE_ALIGN,
1842 NULL);
1843 if (nfs_cdata_cachep == NULL)
1844 goto out_destroy_write_mempool;
1845
1846 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1847 nfs_cdata_cachep);
1848 if (nfs_commit_mempool == NULL)
1849 goto out_destroy_commit_cache;
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1868 if (nfs_congestion_kb > 256*1024)
1869 nfs_congestion_kb = 256*1024;
1870
1871 return 0;
1872
1873out_destroy_commit_cache:
1874 kmem_cache_destroy(nfs_cdata_cachep);
1875out_destroy_write_mempool:
1876 mempool_destroy(nfs_wdata_mempool);
1877out_destroy_write_cache:
1878 kmem_cache_destroy(nfs_wdata_cachep);
1879 return -ENOMEM;
1880}
1881
1882void nfs_destroy_writepagecache(void)
1883{
1884 mempool_destroy(nfs_commit_mempool);
1885 kmem_cache_destroy(nfs_cdata_cachep);
1886 mempool_destroy(nfs_wdata_mempool);
1887 kmem_cache_destroy(nfs_wdata_cachep);
1888}
1889
1890