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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
17#include <linux/sunrpc/clnt.h>
18#include <linux/nfs_fs.h>
19#include <linux/nfs_mount.h>
20#include <linux/nfs_page.h>
21#include <linux/backing-dev.h>
22
23#include <asm/uaccess.h>
24
25#include "delegation.h"
26#include "internal.h"
27#include "iostat.h"
28
29#define NFSDBG_FACILITY NFSDBG_PAGECACHE
30
31#define MIN_POOL_WRITE (32)
32#define MIN_POOL_COMMIT (4)
33
34
35
36
37static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc,
38 struct inode *inode, int ioflags);
39static void nfs_redirty_request(struct nfs_page *req);
40static const struct rpc_call_ops nfs_write_partial_ops;
41static const struct rpc_call_ops nfs_write_full_ops;
42static const struct rpc_call_ops nfs_commit_ops;
43
44static struct kmem_cache *nfs_wdata_cachep;
45static mempool_t *nfs_wdata_mempool;
46static mempool_t *nfs_commit_mempool;
47
48struct nfs_write_data *nfs_commitdata_alloc(void)
49{
50 struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
51
52 if (p) {
53 memset(p, 0, sizeof(*p));
54 INIT_LIST_HEAD(&p->pages);
55 }
56 return p;
57}
58
59void nfs_commit_free(struct nfs_write_data *p)
60{
61 if (p && (p->pagevec != &p->page_array[0]))
62 kfree(p->pagevec);
63 mempool_free(p, nfs_commit_mempool);
64}
65
66struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
67{
68 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
69
70 if (p) {
71 memset(p, 0, sizeof(*p));
72 INIT_LIST_HEAD(&p->pages);
73 p->npages = pagecount;
74 if (pagecount <= ARRAY_SIZE(p->page_array))
75 p->pagevec = p->page_array;
76 else {
77 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
78 if (!p->pagevec) {
79 mempool_free(p, nfs_wdata_mempool);
80 p = NULL;
81 }
82 }
83 }
84 return p;
85}
86
87static void nfs_writedata_free(struct nfs_write_data *p)
88{
89 if (p && (p->pagevec != &p->page_array[0]))
90 kfree(p->pagevec);
91 mempool_free(p, nfs_wdata_mempool);
92}
93
94void nfs_writedata_release(void *data)
95{
96 struct nfs_write_data *wdata = data;
97
98 put_nfs_open_context(wdata->args.context);
99 nfs_writedata_free(wdata);
100}
101
102static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
103{
104 ctx->error = error;
105 smp_wmb();
106 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
107}
108
109static struct nfs_page *nfs_page_find_request_locked(struct page *page)
110{
111 struct nfs_page *req = NULL;
112
113 if (PagePrivate(page)) {
114 req = (struct nfs_page *)page_private(page);
115 if (req != NULL)
116 kref_get(&req->wb_kref);
117 }
118 return req;
119}
120
121static struct nfs_page *nfs_page_find_request(struct page *page)
122{
123 struct inode *inode = page->mapping->host;
124 struct nfs_page *req = NULL;
125
126 spin_lock(&inode->i_lock);
127 req = nfs_page_find_request_locked(page);
128 spin_unlock(&inode->i_lock);
129 return req;
130}
131
132
133static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
134{
135 struct inode *inode = page->mapping->host;
136 loff_t end, i_size;
137 pgoff_t end_index;
138
139 spin_lock(&inode->i_lock);
140 i_size = i_size_read(inode);
141 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
142 if (i_size > 0 && page->index < end_index)
143 goto out;
144 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
145 if (i_size >= end)
146 goto out;
147 i_size_write(inode, end);
148 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
149out:
150 spin_unlock(&inode->i_lock);
151}
152
153
154static void nfs_set_pageerror(struct page *page)
155{
156 SetPageError(page);
157 nfs_zap_mapping(page->mapping->host, page->mapping);
158}
159
160
161
162
163static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
164{
165 if (PageUptodate(page))
166 return;
167 if (base != 0)
168 return;
169 if (count != nfs_page_length(page))
170 return;
171 SetPageUptodate(page);
172}
173
174static int wb_priority(struct writeback_control *wbc)
175{
176 if (wbc->for_reclaim)
177 return FLUSH_HIGHPRI | FLUSH_STABLE;
178 if (wbc->for_kupdate)
179 return FLUSH_LOWPRI;
180 return 0;
181}
182
183
184
185
186
187int nfs_congestion_kb;
188
189#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
190#define NFS_CONGESTION_OFF_THRESH \
191 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
192
193static int nfs_set_page_writeback(struct page *page)
194{
195 int ret = test_set_page_writeback(page);
196
197 if (!ret) {
198 struct inode *inode = page->mapping->host;
199 struct nfs_server *nfss = NFS_SERVER(inode);
200
201 if (atomic_long_inc_return(&nfss->writeback) >
202 NFS_CONGESTION_ON_THRESH)
203 set_bdi_congested(&nfss->backing_dev_info, WRITE);
204 }
205 return ret;
206}
207
208static void nfs_end_page_writeback(struct page *page)
209{
210 struct inode *inode = page->mapping->host;
211 struct nfs_server *nfss = NFS_SERVER(inode);
212
213 end_page_writeback(page);
214 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
215 clear_bdi_congested(&nfss->backing_dev_info, WRITE);
216}
217
218
219
220
221
222static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
223 struct page *page)
224{
225 struct inode *inode = page->mapping->host;
226 struct nfs_page *req;
227 int ret;
228
229 spin_lock(&inode->i_lock);
230 for(;;) {
231 req = nfs_page_find_request_locked(page);
232 if (req == NULL) {
233 spin_unlock(&inode->i_lock);
234 return 0;
235 }
236 if (nfs_set_page_tag_locked(req))
237 break;
238
239
240
241
242
243 spin_unlock(&inode->i_lock);
244 ret = nfs_wait_on_request(req);
245 nfs_release_request(req);
246 if (ret != 0)
247 return ret;
248 spin_lock(&inode->i_lock);
249 }
250 if (test_bit(PG_CLEAN, &req->wb_flags)) {
251 spin_unlock(&inode->i_lock);
252 BUG();
253 }
254 if (nfs_set_page_writeback(page) != 0) {
255 spin_unlock(&inode->i_lock);
256 BUG();
257 }
258 spin_unlock(&inode->i_lock);
259 if (!nfs_pageio_add_request(pgio, req)) {
260 nfs_redirty_request(req);
261 return pgio->pg_error;
262 }
263 return 0;
264}
265
266static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
267{
268 struct inode *inode = page->mapping->host;
269
270 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
271 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
272
273 nfs_pageio_cond_complete(pgio, page->index);
274 return nfs_page_async_flush(pgio, page);
275}
276
277
278
279
280static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
281{
282 struct nfs_pageio_descriptor pgio;
283 int err;
284
285 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc));
286 err = nfs_do_writepage(page, wbc, &pgio);
287 nfs_pageio_complete(&pgio);
288 if (err < 0)
289 return err;
290 if (pgio.pg_error < 0)
291 return pgio.pg_error;
292 return 0;
293}
294
295int nfs_writepage(struct page *page, struct writeback_control *wbc)
296{
297 int ret;
298
299 ret = nfs_writepage_locked(page, wbc);
300 unlock_page(page);
301 return ret;
302}
303
304static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
305{
306 int ret;
307
308 ret = nfs_do_writepage(page, wbc, data);
309 unlock_page(page);
310 return ret;
311}
312
313int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
314{
315 struct inode *inode = mapping->host;
316 struct nfs_pageio_descriptor pgio;
317 int err;
318
319 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
320
321 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
322 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
323 nfs_pageio_complete(&pgio);
324 if (err < 0)
325 return err;
326 if (pgio.pg_error < 0)
327 return pgio.pg_error;
328 return 0;
329}
330
331
332
333
334static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
335{
336 struct nfs_inode *nfsi = NFS_I(inode);
337 int error;
338
339 error = radix_tree_preload(GFP_NOFS);
340 if (error != 0)
341 goto out;
342
343
344 nfs_lock_request_dontget(req);
345
346 spin_lock(&inode->i_lock);
347 error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
348 BUG_ON(error);
349 if (!nfsi->npages) {
350 igrab(inode);
351 if (nfs_have_delegation(inode, FMODE_WRITE))
352 nfsi->change_attr++;
353 }
354 SetPagePrivate(req->wb_page);
355 set_page_private(req->wb_page, (unsigned long)req);
356 nfsi->npages++;
357 kref_get(&req->wb_kref);
358 radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
359 NFS_PAGE_TAG_LOCKED);
360 spin_unlock(&inode->i_lock);
361 radix_tree_preload_end();
362out:
363 return error;
364}
365
366
367
368
369static void nfs_inode_remove_request(struct nfs_page *req)
370{
371 struct inode *inode = req->wb_context->path.dentry->d_inode;
372 struct nfs_inode *nfsi = NFS_I(inode);
373
374 BUG_ON (!NFS_WBACK_BUSY(req));
375
376 spin_lock(&inode->i_lock);
377 set_page_private(req->wb_page, 0);
378 ClearPagePrivate(req->wb_page);
379 radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
380 nfsi->npages--;
381 if (!nfsi->npages) {
382 spin_unlock(&inode->i_lock);
383 iput(inode);
384 } else
385 spin_unlock(&inode->i_lock);
386 nfs_clear_request(req);
387 nfs_release_request(req);
388}
389
390static void
391nfs_mark_request_dirty(struct nfs_page *req)
392{
393 __set_page_dirty_nobuffers(req->wb_page);
394}
395
396#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
397
398
399
400static void
401nfs_mark_request_commit(struct nfs_page *req)
402{
403 struct inode *inode = req->wb_context->path.dentry->d_inode;
404 struct nfs_inode *nfsi = NFS_I(inode);
405
406 spin_lock(&inode->i_lock);
407 nfsi->ncommit++;
408 set_bit(PG_CLEAN, &(req)->wb_flags);
409 radix_tree_tag_set(&nfsi->nfs_page_tree,
410 req->wb_index,
411 NFS_PAGE_TAG_COMMIT);
412 spin_unlock(&inode->i_lock);
413 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
414 inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
415 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
416}
417
418static int
419nfs_clear_request_commit(struct nfs_page *req)
420{
421 struct page *page = req->wb_page;
422
423 if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) {
424 dec_zone_page_state(page, NR_UNSTABLE_NFS);
425 dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
426 return 1;
427 }
428 return 0;
429}
430
431static inline
432int nfs_write_need_commit(struct nfs_write_data *data)
433{
434 return data->verf.committed != NFS_FILE_SYNC;
435}
436
437static inline
438int nfs_reschedule_unstable_write(struct nfs_page *req)
439{
440 if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) {
441 nfs_mark_request_commit(req);
442 return 1;
443 }
444 if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
445 nfs_mark_request_dirty(req);
446 return 1;
447 }
448 return 0;
449}
450#else
451static inline void
452nfs_mark_request_commit(struct nfs_page *req)
453{
454}
455
456static inline int
457nfs_clear_request_commit(struct nfs_page *req)
458{
459 return 0;
460}
461
462static inline
463int nfs_write_need_commit(struct nfs_write_data *data)
464{
465 return 0;
466}
467
468static inline
469int nfs_reschedule_unstable_write(struct nfs_page *req)
470{
471 return 0;
472}
473#endif
474
475
476
477
478
479
480static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages)
481{
482 struct nfs_inode *nfsi = NFS_I(inode);
483 struct nfs_page *req;
484 pgoff_t idx_end, next;
485 unsigned int res = 0;
486 int error;
487
488 if (npages == 0)
489 idx_end = ~0;
490 else
491 idx_end = idx_start + npages - 1;
492
493 next = idx_start;
494 while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) {
495 if (req->wb_index > idx_end)
496 break;
497
498 next = req->wb_index + 1;
499 BUG_ON(!NFS_WBACK_BUSY(req));
500
501 kref_get(&req->wb_kref);
502 spin_unlock(&inode->i_lock);
503 error = nfs_wait_on_request(req);
504 nfs_release_request(req);
505 spin_lock(&inode->i_lock);
506 if (error < 0)
507 return error;
508 res++;
509 }
510 return res;
511}
512
513static void nfs_cancel_commit_list(struct list_head *head)
514{
515 struct nfs_page *req;
516
517 while(!list_empty(head)) {
518 req = nfs_list_entry(head->next);
519 nfs_list_remove_request(req);
520 nfs_clear_request_commit(req);
521 nfs_inode_remove_request(req);
522 nfs_unlock_request(req);
523 }
524}
525
526#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
527
528
529
530
531
532
533
534
535
536
537static int
538nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
539{
540 struct nfs_inode *nfsi = NFS_I(inode);
541 int res = 0;
542
543 if (nfsi->ncommit != 0) {
544 res = nfs_scan_list(nfsi, dst, idx_start, npages,
545 NFS_PAGE_TAG_COMMIT);
546 nfsi->ncommit -= res;
547 }
548 return res;
549}
550#else
551static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
552{
553 return 0;
554}
555#endif
556
557
558
559
560
561
562
563
564static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
565 struct page *page,
566 unsigned int offset,
567 unsigned int bytes)
568{
569 struct nfs_page *req;
570 unsigned int rqend;
571 unsigned int end;
572 int error;
573
574 if (!PagePrivate(page))
575 return NULL;
576
577 end = offset + bytes;
578 spin_lock(&inode->i_lock);
579
580 for (;;) {
581 req = nfs_page_find_request_locked(page);
582 if (req == NULL)
583 goto out_unlock;
584
585 rqend = req->wb_offset + req->wb_bytes;
586
587
588
589
590
591
592 if (offset > rqend
593 || end < req->wb_offset)
594 goto out_flushme;
595
596 if (nfs_set_page_tag_locked(req))
597 break;
598
599
600 spin_unlock(&inode->i_lock);
601 error = nfs_wait_on_request(req);
602 nfs_release_request(req);
603 if (error != 0)
604 goto out_err;
605 spin_lock(&inode->i_lock);
606 }
607
608 if (nfs_clear_request_commit(req))
609 radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree,
610 req->wb_index, NFS_PAGE_TAG_COMMIT);
611
612
613 if (offset < req->wb_offset) {
614 req->wb_offset = offset;
615 req->wb_pgbase = offset;
616 }
617 if (end > rqend)
618 req->wb_bytes = end - req->wb_offset;
619 else
620 req->wb_bytes = rqend - req->wb_offset;
621out_unlock:
622 spin_unlock(&inode->i_lock);
623 return req;
624out_flushme:
625 spin_unlock(&inode->i_lock);
626 nfs_release_request(req);
627 error = nfs_wb_page(inode, page);
628out_err:
629 return ERR_PTR(error);
630}
631
632
633
634
635
636
637
638
639static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
640 struct page *page, unsigned int offset, unsigned int bytes)
641{
642 struct inode *inode = page->mapping->host;
643 struct nfs_page *req;
644 int error;
645
646 req = nfs_try_to_update_request(inode, page, offset, bytes);
647 if (req != NULL)
648 goto out;
649 req = nfs_create_request(ctx, inode, page, offset, bytes);
650 if (IS_ERR(req))
651 goto out;
652 error = nfs_inode_add_request(inode, req);
653 if (error != 0) {
654 nfs_release_request(req);
655 req = ERR_PTR(error);
656 }
657out:
658 return req;
659}
660
661static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
662 unsigned int offset, unsigned int count)
663{
664 struct nfs_page *req;
665
666 req = nfs_setup_write_request(ctx, page, offset, count);
667 if (IS_ERR(req))
668 return PTR_ERR(req);
669
670 nfs_grow_file(page, offset, count);
671 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
672 nfs_clear_page_tag_locked(req);
673 return 0;
674}
675
676int nfs_flush_incompatible(struct file *file, struct page *page)
677{
678 struct nfs_open_context *ctx = nfs_file_open_context(file);
679 struct nfs_page *req;
680 int do_flush, status;
681
682
683
684
685
686
687
688
689 do {
690 req = nfs_page_find_request(page);
691 if (req == NULL)
692 return 0;
693 do_flush = req->wb_page != page || req->wb_context != ctx;
694 nfs_release_request(req);
695 if (!do_flush)
696 return 0;
697 status = nfs_wb_page(page->mapping->host, page);
698 } while (status == 0);
699 return status;
700}
701
702
703
704
705
706
707static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
708{
709 return PageUptodate(page) &&
710 !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
711}
712
713
714
715
716
717
718
719int nfs_updatepage(struct file *file, struct page *page,
720 unsigned int offset, unsigned int count)
721{
722 struct nfs_open_context *ctx = nfs_file_open_context(file);
723 struct inode *inode = page->mapping->host;
724 int status = 0;
725
726 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
727
728 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
729 file->f_path.dentry->d_parent->d_name.name,
730 file->f_path.dentry->d_name.name, count,
731 (long long)(page_offset(page) + offset));
732
733
734
735
736
737
738 if (nfs_write_pageuptodate(page, inode) &&
739 inode->i_flock == NULL &&
740 !(file->f_flags & O_SYNC)) {
741 count = max(count + offset, nfs_page_length(page));
742 offset = 0;
743 }
744
745 status = nfs_writepage_setup(ctx, page, offset, count);
746 if (status < 0)
747 nfs_set_pageerror(page);
748 else
749 __set_page_dirty_nobuffers(page);
750
751 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
752 status, (long long)i_size_read(inode));
753 return status;
754}
755
756static void nfs_writepage_release(struct nfs_page *req)
757{
758
759 if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) {
760 nfs_end_page_writeback(req->wb_page);
761 nfs_inode_remove_request(req);
762 } else
763 nfs_end_page_writeback(req->wb_page);
764 nfs_clear_page_tag_locked(req);
765}
766
767static int flush_task_priority(int how)
768{
769 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
770 case FLUSH_HIGHPRI:
771 return RPC_PRIORITY_HIGH;
772 case FLUSH_LOWPRI:
773 return RPC_PRIORITY_LOW;
774 }
775 return RPC_PRIORITY_NORMAL;
776}
777
778
779
780
781static int nfs_write_rpcsetup(struct nfs_page *req,
782 struct nfs_write_data *data,
783 const struct rpc_call_ops *call_ops,
784 unsigned int count, unsigned int offset,
785 int how)
786{
787 struct inode *inode = req->wb_context->path.dentry->d_inode;
788 int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
789 int priority = flush_task_priority(how);
790 struct rpc_task *task;
791 struct rpc_message msg = {
792 .rpc_argp = &data->args,
793 .rpc_resp = &data->res,
794 .rpc_cred = req->wb_context->cred,
795 };
796 struct rpc_task_setup task_setup_data = {
797 .rpc_client = NFS_CLIENT(inode),
798 .task = &data->task,
799 .rpc_message = &msg,
800 .callback_ops = call_ops,
801 .callback_data = data,
802 .workqueue = nfsiod_workqueue,
803 .flags = flags,
804 .priority = priority,
805 };
806
807
808
809
810 data->req = req;
811 data->inode = inode = req->wb_context->path.dentry->d_inode;
812 data->cred = msg.rpc_cred;
813
814 data->args.fh = NFS_FH(inode);
815 data->args.offset = req_offset(req) + offset;
816 data->args.pgbase = req->wb_pgbase + offset;
817 data->args.pages = data->pagevec;
818 data->args.count = count;
819 data->args.context = get_nfs_open_context(req->wb_context);
820 data->args.stable = NFS_UNSTABLE;
821 if (how & FLUSH_STABLE) {
822 data->args.stable = NFS_DATA_SYNC;
823 if (!NFS_I(inode)->ncommit)
824 data->args.stable = NFS_FILE_SYNC;
825 }
826
827 data->res.fattr = &data->fattr;
828 data->res.count = count;
829 data->res.verf = &data->verf;
830 nfs_fattr_init(&data->fattr);
831
832
833 NFS_PROTO(inode)->write_setup(data, &msg);
834
835 dprintk("NFS: %5u initiated write call "
836 "(req %s/%lld, %u bytes @ offset %llu)\n",
837 data->task.tk_pid,
838 inode->i_sb->s_id,
839 (long long)NFS_FILEID(inode),
840 count,
841 (unsigned long long)data->args.offset);
842
843 task = rpc_run_task(&task_setup_data);
844 if (IS_ERR(task))
845 return PTR_ERR(task);
846 rpc_put_task(task);
847 return 0;
848}
849
850
851
852
853
854static void nfs_redirty_request(struct nfs_page *req)
855{
856 nfs_mark_request_dirty(req);
857 nfs_end_page_writeback(req->wb_page);
858 nfs_clear_page_tag_locked(req);
859}
860
861
862
863
864
865static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
866{
867 struct nfs_page *req = nfs_list_entry(head->next);
868 struct page *page = req->wb_page;
869 struct nfs_write_data *data;
870 size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
871 unsigned int offset;
872 int requests = 0;
873 int ret = 0;
874 LIST_HEAD(list);
875
876 nfs_list_remove_request(req);
877
878 nbytes = count;
879 do {
880 size_t len = min(nbytes, wsize);
881
882 data = nfs_writedata_alloc(1);
883 if (!data)
884 goto out_bad;
885 list_add(&data->pages, &list);
886 requests++;
887 nbytes -= len;
888 } while (nbytes != 0);
889 atomic_set(&req->wb_complete, requests);
890
891 ClearPageError(page);
892 offset = 0;
893 nbytes = count;
894 do {
895 int ret2;
896
897 data = list_entry(list.next, struct nfs_write_data, pages);
898 list_del_init(&data->pages);
899
900 data->pagevec[0] = page;
901
902 if (nbytes < wsize)
903 wsize = nbytes;
904 ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
905 wsize, offset, how);
906 if (ret == 0)
907 ret = ret2;
908 offset += wsize;
909 nbytes -= wsize;
910 } while (nbytes != 0);
911
912 return ret;
913
914out_bad:
915 while (!list_empty(&list)) {
916 data = list_entry(list.next, struct nfs_write_data, pages);
917 list_del(&data->pages);
918 nfs_writedata_release(data);
919 }
920 nfs_redirty_request(req);
921 return -ENOMEM;
922}
923
924
925
926
927
928
929
930
931
932static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
933{
934 struct nfs_page *req;
935 struct page **pages;
936 struct nfs_write_data *data;
937
938 data = nfs_writedata_alloc(npages);
939 if (!data)
940 goto out_bad;
941
942 pages = data->pagevec;
943 while (!list_empty(head)) {
944 req = nfs_list_entry(head->next);
945 nfs_list_remove_request(req);
946 nfs_list_add_request(req, &data->pages);
947 ClearPageError(req->wb_page);
948 *pages++ = req->wb_page;
949 }
950 req = nfs_list_entry(data->pages.next);
951
952
953 return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
954 out_bad:
955 while (!list_empty(head)) {
956 req = nfs_list_entry(head->next);
957 nfs_list_remove_request(req);
958 nfs_redirty_request(req);
959 }
960 return -ENOMEM;
961}
962
963static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
964 struct inode *inode, int ioflags)
965{
966 size_t wsize = NFS_SERVER(inode)->wsize;
967
968 if (wsize < PAGE_CACHE_SIZE)
969 nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
970 else
971 nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
972}
973
974
975
976
977static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
978{
979 struct nfs_write_data *data = calldata;
980
981 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
982 task->tk_pid,
983 data->req->wb_context->path.dentry->d_inode->i_sb->s_id,
984 (long long)
985 NFS_FILEID(data->req->wb_context->path.dentry->d_inode),
986 data->req->wb_bytes, (long long)req_offset(data->req));
987
988 nfs_writeback_done(task, data);
989}
990
991static void nfs_writeback_release_partial(void *calldata)
992{
993 struct nfs_write_data *data = calldata;
994 struct nfs_page *req = data->req;
995 struct page *page = req->wb_page;
996 int status = data->task.tk_status;
997
998 if (status < 0) {
999 nfs_set_pageerror(page);
1000 nfs_context_set_write_error(req->wb_context, status);
1001 dprintk(", error = %d\n", status);
1002 goto out;
1003 }
1004
1005 if (nfs_write_need_commit(data)) {
1006 struct inode *inode = page->mapping->host;
1007
1008 spin_lock(&inode->i_lock);
1009 if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
1010
1011 } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
1012 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1013 dprintk(" defer commit\n");
1014 } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
1015 set_bit(PG_NEED_RESCHED, &req->wb_flags);
1016 clear_bit(PG_NEED_COMMIT, &req->wb_flags);
1017 dprintk(" server reboot detected\n");
1018 }
1019 spin_unlock(&inode->i_lock);
1020 } else
1021 dprintk(" OK\n");
1022
1023out:
1024 if (atomic_dec_and_test(&req->wb_complete))
1025 nfs_writepage_release(req);
1026 nfs_writedata_release(calldata);
1027}
1028
1029static const struct rpc_call_ops nfs_write_partial_ops = {
1030 .rpc_call_done = nfs_writeback_done_partial,
1031 .rpc_release = nfs_writeback_release_partial,
1032};
1033
1034
1035
1036
1037
1038
1039
1040
1041static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
1042{
1043 struct nfs_write_data *data = calldata;
1044
1045 nfs_writeback_done(task, data);
1046}
1047
1048static void nfs_writeback_release_full(void *calldata)
1049{
1050 struct nfs_write_data *data = calldata;
1051 int status = data->task.tk_status;
1052
1053
1054 while (!list_empty(&data->pages)) {
1055 struct nfs_page *req = nfs_list_entry(data->pages.next);
1056 struct page *page = req->wb_page;
1057
1058 nfs_list_remove_request(req);
1059
1060 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1061 data->task.tk_pid,
1062 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1063 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
1064 req->wb_bytes,
1065 (long long)req_offset(req));
1066
1067 if (status < 0) {
1068 nfs_set_pageerror(page);
1069 nfs_context_set_write_error(req->wb_context, status);
1070 dprintk(", error = %d\n", status);
1071 goto remove_request;
1072 }
1073
1074 if (nfs_write_need_commit(data)) {
1075 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1076 nfs_mark_request_commit(req);
1077 nfs_end_page_writeback(page);
1078 dprintk(" marked for commit\n");
1079 goto next;
1080 }
1081 dprintk(" OK\n");
1082remove_request:
1083 nfs_end_page_writeback(page);
1084 nfs_inode_remove_request(req);
1085 next:
1086 nfs_clear_page_tag_locked(req);
1087 }
1088 nfs_writedata_release(calldata);
1089}
1090
1091static const struct rpc_call_ops nfs_write_full_ops = {
1092 .rpc_call_done = nfs_writeback_done_full,
1093 .rpc_release = nfs_writeback_release_full,
1094};
1095
1096
1097
1098
1099
1100int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
1101{
1102 struct nfs_writeargs *argp = &data->args;
1103 struct nfs_writeres *resp = &data->res;
1104 int status;
1105
1106 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1107 task->tk_pid, task->tk_status);
1108
1109
1110
1111
1112
1113
1114
1115
1116 status = NFS_PROTO(data->inode)->write_done(task, data);
1117 if (status != 0)
1118 return status;
1119 nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1120
1121#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1122 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1123
1124
1125
1126
1127
1128
1129
1130
1131 static unsigned long complain;
1132
1133 if (time_before(complain, jiffies)) {
1134 dprintk("NFS: faulty NFS server %s:"
1135 " (committed = %d) != (stable = %d)\n",
1136 NFS_SERVER(data->inode)->nfs_client->cl_hostname,
1137 resp->verf->committed, argp->stable);
1138 complain = jiffies + 300 * HZ;
1139 }
1140 }
1141#endif
1142
1143 if (task->tk_status >= 0 && resp->count < argp->count) {
1144 static unsigned long complain;
1145
1146 nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
1147
1148
1149 if (resp->count != 0) {
1150
1151 if (resp->verf->committed != NFS_UNSTABLE) {
1152
1153 argp->offset += resp->count;
1154 argp->pgbase += resp->count;
1155 argp->count -= resp->count;
1156 } else {
1157
1158
1159
1160 argp->stable = NFS_FILE_SYNC;
1161 }
1162 rpc_restart_call(task);
1163 return -EAGAIN;
1164 }
1165 if (time_before(complain, jiffies)) {
1166 printk(KERN_WARNING
1167 "NFS: Server wrote zero bytes, expected %u.\n",
1168 argp->count);
1169 complain = jiffies + 300 * HZ;
1170 }
1171
1172 task->tk_status = -EIO;
1173 }
1174 return 0;
1175}
1176
1177
1178#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1179void nfs_commitdata_release(void *data)
1180{
1181 struct nfs_write_data *wdata = data;
1182
1183 put_nfs_open_context(wdata->args.context);
1184 nfs_commit_free(wdata);
1185}
1186
1187
1188
1189
1190static int nfs_commit_rpcsetup(struct list_head *head,
1191 struct nfs_write_data *data,
1192 int how)
1193{
1194 struct nfs_page *first = nfs_list_entry(head->next);
1195 struct inode *inode = first->wb_context->path.dentry->d_inode;
1196 int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1197 int priority = flush_task_priority(how);
1198 struct rpc_task *task;
1199 struct rpc_message msg = {
1200 .rpc_argp = &data->args,
1201 .rpc_resp = &data->res,
1202 .rpc_cred = first->wb_context->cred,
1203 };
1204 struct rpc_task_setup task_setup_data = {
1205 .task = &data->task,
1206 .rpc_client = NFS_CLIENT(inode),
1207 .rpc_message = &msg,
1208 .callback_ops = &nfs_commit_ops,
1209 .callback_data = data,
1210 .workqueue = nfsiod_workqueue,
1211 .flags = flags,
1212 .priority = priority,
1213 };
1214
1215
1216
1217
1218 list_splice_init(head, &data->pages);
1219
1220 data->inode = inode;
1221 data->cred = msg.rpc_cred;
1222
1223 data->args.fh = NFS_FH(data->inode);
1224
1225 data->args.offset = 0;
1226 data->args.count = 0;
1227 data->args.context = get_nfs_open_context(first->wb_context);
1228 data->res.count = 0;
1229 data->res.fattr = &data->fattr;
1230 data->res.verf = &data->verf;
1231 nfs_fattr_init(&data->fattr);
1232
1233
1234 NFS_PROTO(inode)->commit_setup(data, &msg);
1235
1236 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
1237
1238 task = rpc_run_task(&task_setup_data);
1239 if (IS_ERR(task))
1240 return PTR_ERR(task);
1241 rpc_put_task(task);
1242 return 0;
1243}
1244
1245
1246
1247
1248static int
1249nfs_commit_list(struct inode *inode, struct list_head *head, int how)
1250{
1251 struct nfs_write_data *data;
1252 struct nfs_page *req;
1253
1254 data = nfs_commitdata_alloc();
1255
1256 if (!data)
1257 goto out_bad;
1258
1259
1260 return nfs_commit_rpcsetup(head, data, how);
1261 out_bad:
1262 while (!list_empty(head)) {
1263 req = nfs_list_entry(head->next);
1264 nfs_list_remove_request(req);
1265 nfs_mark_request_commit(req);
1266 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1267 dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
1268 BDI_RECLAIMABLE);
1269 nfs_clear_page_tag_locked(req);
1270 }
1271 return -ENOMEM;
1272}
1273
1274
1275
1276
1277static void nfs_commit_done(struct rpc_task *task, void *calldata)
1278{
1279 struct nfs_write_data *data = calldata;
1280
1281 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1282 task->tk_pid, task->tk_status);
1283
1284
1285 if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
1286 return;
1287}
1288
1289static void nfs_commit_release(void *calldata)
1290{
1291 struct nfs_write_data *data = calldata;
1292 struct nfs_page *req;
1293 int status = data->task.tk_status;
1294
1295 while (!list_empty(&data->pages)) {
1296 req = nfs_list_entry(data->pages.next);
1297 nfs_list_remove_request(req);
1298 nfs_clear_request_commit(req);
1299
1300 dprintk("NFS: commit (%s/%lld %d@%lld)",
1301 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1302 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
1303 req->wb_bytes,
1304 (long long)req_offset(req));
1305 if (status < 0) {
1306 nfs_context_set_write_error(req->wb_context, status);
1307 nfs_inode_remove_request(req);
1308 dprintk(", error = %d\n", status);
1309 goto next;
1310 }
1311
1312
1313
1314 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1315
1316 nfs_inode_remove_request(req);
1317 dprintk(" OK\n");
1318 goto next;
1319 }
1320
1321 dprintk(" mismatch\n");
1322 nfs_mark_request_dirty(req);
1323 next:
1324 nfs_clear_page_tag_locked(req);
1325 }
1326 nfs_commitdata_release(calldata);
1327}
1328
1329static const struct rpc_call_ops nfs_commit_ops = {
1330 .rpc_call_done = nfs_commit_done,
1331 .rpc_release = nfs_commit_release,
1332};
1333
1334int nfs_commit_inode(struct inode *inode, int how)
1335{
1336 LIST_HEAD(head);
1337 int res;
1338
1339 spin_lock(&inode->i_lock);
1340 res = nfs_scan_commit(inode, &head, 0, 0);
1341 spin_unlock(&inode->i_lock);
1342 if (res) {
1343 int error = nfs_commit_list(inode, &head, how);
1344 if (error < 0)
1345 return error;
1346 }
1347 return res;
1348}
1349#else
1350static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
1351{
1352 return 0;
1353}
1354#endif
1355
1356long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
1357{
1358 struct inode *inode = mapping->host;
1359 pgoff_t idx_start, idx_end;
1360 unsigned int npages = 0;
1361 LIST_HEAD(head);
1362 int nocommit = how & FLUSH_NOCOMMIT;
1363 long pages, ret;
1364
1365
1366 if (wbc->range_cyclic)
1367 idx_start = 0;
1368 else {
1369 idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
1370 idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
1371 if (idx_end > idx_start) {
1372 pgoff_t l_npages = 1 + idx_end - idx_start;
1373 npages = l_npages;
1374 if (sizeof(npages) != sizeof(l_npages) &&
1375 (pgoff_t)npages != l_npages)
1376 npages = 0;
1377 }
1378 }
1379 how &= ~FLUSH_NOCOMMIT;
1380 spin_lock(&inode->i_lock);
1381 do {
1382 ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
1383 if (ret != 0)
1384 continue;
1385 if (nocommit)
1386 break;
1387 pages = nfs_scan_commit(inode, &head, idx_start, npages);
1388 if (pages == 0)
1389 break;
1390 if (how & FLUSH_INVALIDATE) {
1391 spin_unlock(&inode->i_lock);
1392 nfs_cancel_commit_list(&head);
1393 ret = pages;
1394 spin_lock(&inode->i_lock);
1395 continue;
1396 }
1397 pages += nfs_scan_commit(inode, &head, 0, 0);
1398 spin_unlock(&inode->i_lock);
1399 ret = nfs_commit_list(inode, &head, how);
1400 spin_lock(&inode->i_lock);
1401
1402 } while (ret >= 0);
1403 spin_unlock(&inode->i_lock);
1404 return ret;
1405}
1406
1407static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
1408{
1409 int ret;
1410
1411 ret = nfs_writepages(mapping, wbc);
1412 if (ret < 0)
1413 goto out;
1414 ret = nfs_sync_mapping_wait(mapping, wbc, how);
1415 if (ret < 0)
1416 goto out;
1417 return 0;
1418out:
1419 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
1420 return ret;
1421}
1422
1423
1424static int nfs_write_mapping(struct address_space *mapping, int how)
1425{
1426 struct writeback_control wbc = {
1427 .bdi = mapping->backing_dev_info,
1428 .sync_mode = WB_SYNC_NONE,
1429 .nr_to_write = LONG_MAX,
1430 .range_start = 0,
1431 .range_end = LLONG_MAX,
1432 .for_writepages = 1,
1433 };
1434 int ret;
1435
1436 ret = __nfs_write_mapping(mapping, &wbc, how);
1437 if (ret < 0)
1438 return ret;
1439 wbc.sync_mode = WB_SYNC_ALL;
1440 return __nfs_write_mapping(mapping, &wbc, how);
1441}
1442
1443
1444
1445
1446int nfs_wb_all(struct inode *inode)
1447{
1448 return nfs_write_mapping(inode->i_mapping, 0);
1449}
1450
1451int nfs_wb_nocommit(struct inode *inode)
1452{
1453 return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT);
1454}
1455
1456int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1457{
1458 struct nfs_page *req;
1459 loff_t range_start = page_offset(page);
1460 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
1461 struct writeback_control wbc = {
1462 .bdi = page->mapping->backing_dev_info,
1463 .sync_mode = WB_SYNC_ALL,
1464 .nr_to_write = LONG_MAX,
1465 .range_start = range_start,
1466 .range_end = range_end,
1467 };
1468 int ret = 0;
1469
1470 BUG_ON(!PageLocked(page));
1471 for (;;) {
1472 req = nfs_page_find_request(page);
1473 if (req == NULL)
1474 goto out;
1475 if (test_bit(PG_CLEAN, &req->wb_flags)) {
1476 nfs_release_request(req);
1477 break;
1478 }
1479 if (nfs_lock_request_dontget(req)) {
1480 nfs_inode_remove_request(req);
1481
1482
1483
1484
1485 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1486 nfs_unlock_request(req);
1487 break;
1488 }
1489 ret = nfs_wait_on_request(req);
1490 if (ret < 0)
1491 goto out;
1492 }
1493 if (!PagePrivate(page))
1494 return 0;
1495 ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE);
1496out:
1497 return ret;
1498}
1499
1500static int nfs_wb_page_priority(struct inode *inode, struct page *page,
1501 int how)
1502{
1503 loff_t range_start = page_offset(page);
1504 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
1505 struct writeback_control wbc = {
1506 .bdi = page->mapping->backing_dev_info,
1507 .sync_mode = WB_SYNC_ALL,
1508 .nr_to_write = LONG_MAX,
1509 .range_start = range_start,
1510 .range_end = range_end,
1511 };
1512 int ret;
1513
1514 do {
1515 if (clear_page_dirty_for_io(page)) {
1516 ret = nfs_writepage_locked(page, &wbc);
1517 if (ret < 0)
1518 goto out_error;
1519 } else if (!PagePrivate(page))
1520 break;
1521 ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
1522 if (ret < 0)
1523 goto out_error;
1524 } while (PagePrivate(page));
1525 return 0;
1526out_error:
1527 __mark_inode_dirty(inode, I_DIRTY_PAGES);
1528 return ret;
1529}
1530
1531
1532
1533
1534int nfs_wb_page(struct inode *inode, struct page* page)
1535{
1536 return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
1537}
1538
1539int __init nfs_init_writepagecache(void)
1540{
1541 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1542 sizeof(struct nfs_write_data),
1543 0, SLAB_HWCACHE_ALIGN,
1544 NULL);
1545 if (nfs_wdata_cachep == NULL)
1546 return -ENOMEM;
1547
1548 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1549 nfs_wdata_cachep);
1550 if (nfs_wdata_mempool == NULL)
1551 return -ENOMEM;
1552
1553 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1554 nfs_wdata_cachep);
1555 if (nfs_commit_mempool == NULL)
1556 return -ENOMEM;
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1575 if (nfs_congestion_kb > 256*1024)
1576 nfs_congestion_kb = 256*1024;
1577
1578 return 0;
1579}
1580
1581void nfs_destroy_writepagecache(void)
1582{
1583 mempool_destroy(nfs_commit_mempool);
1584 mempool_destroy(nfs_wdata_mempool);
1585 kmem_cache_destroy(nfs_wdata_cachep);
1586}
1587