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41#include <linux/errno.h>
42#include <linux/sched.h>
43#include <linux/kernel.h>
44#include <linux/file.h>
45#include <linux/pagemap.h>
46#include <linux/kref.h>
47#include <linux/slab.h>
48#include <linux/task_io_accounting_ops.h>
49#include <linux/module.h>
50
51#include <linux/nfs_fs.h>
52#include <linux/nfs_page.h>
53#include <linux/sunrpc/clnt.h>
54
55#include <asm/uaccess.h>
56#include <linux/atomic.h>
57
58#include "internal.h"
59#include "iostat.h"
60#include "pnfs.h"
61
62#define NFSDBG_FACILITY NFSDBG_VFS
63
64static struct kmem_cache *nfs_direct_cachep;
65
66
67
68
69struct nfs_direct_mirror {
70 ssize_t count;
71};
72
73struct nfs_direct_req {
74 struct kref kref;
75
76
77 struct nfs_open_context *ctx;
78 struct nfs_lock_context *l_ctx;
79 struct kiocb * iocb;
80 struct inode * inode;
81
82
83 atomic_t io_count;
84 spinlock_t lock;
85
86 struct nfs_direct_mirror mirrors[NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX];
87 int mirror_count;
88
89 ssize_t count,
90 bytes_left,
91 io_start,
92 error;
93 struct completion completion;
94
95
96 struct nfs_mds_commit_info mds_cinfo;
97 struct pnfs_ds_commit_info ds_cinfo;
98 struct work_struct work;
99 int flags;
100#define NFS_ODIRECT_DO_COMMIT (1)
101#define NFS_ODIRECT_RESCHED_WRITES (2)
102 struct nfs_writeverf verf;
103};
104
105static const struct nfs_pgio_completion_ops nfs_direct_write_completion_ops;
106static const struct nfs_commit_completion_ops nfs_direct_commit_completion_ops;
107static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode);
108static void nfs_direct_write_schedule_work(struct work_struct *work);
109
110static inline void get_dreq(struct nfs_direct_req *dreq)
111{
112 atomic_inc(&dreq->io_count);
113}
114
115static inline int put_dreq(struct nfs_direct_req *dreq)
116{
117 return atomic_dec_and_test(&dreq->io_count);
118}
119
120static void
121nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
122{
123 int i;
124 ssize_t count;
125
126 if (dreq->mirror_count == 1) {
127 dreq->mirrors[hdr->pgio_mirror_idx].count += hdr->good_bytes;
128 dreq->count += hdr->good_bytes;
129 } else {
130
131 count = dreq->mirrors[hdr->pgio_mirror_idx].count;
132 if (count + dreq->io_start < hdr->io_start + hdr->good_bytes) {
133 count = hdr->io_start + hdr->good_bytes - dreq->io_start;
134 dreq->mirrors[hdr->pgio_mirror_idx].count = count;
135 }
136
137
138 count = dreq->mirrors[0].count;
139
140 for (i = 1; i < dreq->mirror_count; i++)
141 count = min(count, dreq->mirrors[i].count);
142
143 dreq->count = count;
144 }
145}
146
147
148
149
150
151
152
153
154
155static struct nfs_writeverf *
156nfs_direct_select_verf(struct nfs_direct_req *dreq,
157 struct nfs_client *ds_clp,
158 int commit_idx)
159{
160 struct nfs_writeverf *verfp = &dreq->verf;
161
162#ifdef CONFIG_NFS_V4_1
163
164
165
166
167 if (ds_clp && dreq->ds_cinfo.nbuckets > 0) {
168 if (commit_idx >= 0 && commit_idx < dreq->ds_cinfo.nbuckets)
169 verfp = &dreq->ds_cinfo.buckets[commit_idx].direct_verf;
170 else
171 WARN_ON_ONCE(1);
172 }
173#endif
174 return verfp;
175}
176
177
178
179
180
181
182
183
184
185static void nfs_direct_set_hdr_verf(struct nfs_direct_req *dreq,
186 struct nfs_pgio_header *hdr)
187{
188 struct nfs_writeverf *verfp;
189
190 verfp = nfs_direct_select_verf(dreq, hdr->ds_clp, hdr->ds_commit_idx);
191 WARN_ON_ONCE(verfp->committed >= 0);
192 memcpy(verfp, &hdr->verf, sizeof(struct nfs_writeverf));
193 WARN_ON_ONCE(verfp->committed < 0);
194}
195
196
197
198
199
200
201
202
203
204
205static int nfs_direct_set_or_cmp_hdr_verf(struct nfs_direct_req *dreq,
206 struct nfs_pgio_header *hdr)
207{
208 struct nfs_writeverf *verfp;
209
210 verfp = nfs_direct_select_verf(dreq, hdr->ds_clp, hdr->ds_commit_idx);
211 if (verfp->committed < 0) {
212 nfs_direct_set_hdr_verf(dreq, hdr);
213 return 0;
214 }
215 return memcmp(verfp, &hdr->verf, sizeof(struct nfs_writeverf));
216}
217
218
219
220
221
222
223
224
225
226static int nfs_direct_cmp_commit_data_verf(struct nfs_direct_req *dreq,
227 struct nfs_commit_data *data)
228{
229 struct nfs_writeverf *verfp;
230
231 verfp = nfs_direct_select_verf(dreq, data->ds_clp,
232 data->ds_commit_index);
233
234
235 if (verfp->committed < 0)
236 return 1;
237
238 return memcmp(verfp, &data->verf, sizeof(struct nfs_writeverf));
239}
240
241
242
243
244
245
246
247
248
249
250
251
252
253ssize_t nfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
254{
255 struct inode *inode = iocb->ki_filp->f_mapping->host;
256
257
258 if (!IS_SWAPFILE(inode))
259 return 0;
260
261 VM_BUG_ON(iov_iter_count(iter) != PAGE_SIZE);
262
263 if (iov_iter_rw(iter) == READ)
264 return nfs_file_direct_read(iocb, iter, pos);
265 return nfs_file_direct_write(iocb, iter);
266}
267
268static void nfs_direct_release_pages(struct page **pages, unsigned int npages)
269{
270 unsigned int i;
271 for (i = 0; i < npages; i++)
272 put_page(pages[i]);
273}
274
275void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
276 struct nfs_direct_req *dreq)
277{
278 cinfo->lock = &dreq->inode->i_lock;
279 cinfo->mds = &dreq->mds_cinfo;
280 cinfo->ds = &dreq->ds_cinfo;
281 cinfo->dreq = dreq;
282 cinfo->completion_ops = &nfs_direct_commit_completion_ops;
283}
284
285static inline void nfs_direct_setup_mirroring(struct nfs_direct_req *dreq,
286 struct nfs_pageio_descriptor *pgio,
287 struct nfs_page *req)
288{
289 int mirror_count = 1;
290
291 if (pgio->pg_ops->pg_get_mirror_count)
292 mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
293
294 dreq->mirror_count = mirror_count;
295}
296
297static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
298{
299 struct nfs_direct_req *dreq;
300
301 dreq = kmem_cache_zalloc(nfs_direct_cachep, GFP_KERNEL);
302 if (!dreq)
303 return NULL;
304
305 kref_init(&dreq->kref);
306 kref_get(&dreq->kref);
307 init_completion(&dreq->completion);
308 INIT_LIST_HEAD(&dreq->mds_cinfo.list);
309 dreq->verf.committed = NFS_INVALID_STABLE_HOW;
310 INIT_WORK(&dreq->work, nfs_direct_write_schedule_work);
311 dreq->mirror_count = 1;
312 spin_lock_init(&dreq->lock);
313
314 return dreq;
315}
316
317static void nfs_direct_req_free(struct kref *kref)
318{
319 struct nfs_direct_req *dreq = container_of(kref, struct nfs_direct_req, kref);
320
321 nfs_free_pnfs_ds_cinfo(&dreq->ds_cinfo);
322 if (dreq->l_ctx != NULL)
323 nfs_put_lock_context(dreq->l_ctx);
324 if (dreq->ctx != NULL)
325 put_nfs_open_context(dreq->ctx);
326 kmem_cache_free(nfs_direct_cachep, dreq);
327}
328
329static void nfs_direct_req_release(struct nfs_direct_req *dreq)
330{
331 kref_put(&dreq->kref, nfs_direct_req_free);
332}
333
334ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq)
335{
336 return dreq->bytes_left;
337}
338EXPORT_SYMBOL_GPL(nfs_dreq_bytes_left);
339
340
341
342
343static ssize_t nfs_direct_wait(struct nfs_direct_req *dreq)
344{
345 ssize_t result = -EIOCBQUEUED;
346
347
348 if (dreq->iocb)
349 goto out;
350
351 result = wait_for_completion_killable(&dreq->completion);
352
353 if (!result)
354 result = dreq->error;
355 if (!result)
356 result = dreq->count;
357
358out:
359 return (ssize_t) result;
360}
361
362
363
364
365
366static void nfs_direct_complete(struct nfs_direct_req *dreq, bool write)
367{
368 struct inode *inode = dreq->inode;
369
370 if (dreq->iocb && write) {
371 loff_t pos = dreq->iocb->ki_pos + dreq->count;
372
373 spin_lock(&inode->i_lock);
374 if (i_size_read(inode) < pos)
375 i_size_write(inode, pos);
376 spin_unlock(&inode->i_lock);
377 }
378
379 if (write)
380 nfs_zap_mapping(inode, inode->i_mapping);
381
382 inode_dio_end(inode);
383
384 if (dreq->iocb) {
385 long res = (long) dreq->error;
386 if (!res)
387 res = (long) dreq->count;
388 dreq->iocb->ki_complete(dreq->iocb, res, 0);
389 }
390
391 complete_all(&dreq->completion);
392
393 nfs_direct_req_release(dreq);
394}
395
396static void nfs_direct_readpage_release(struct nfs_page *req)
397{
398 dprintk("NFS: direct read done (%s/%llu %d@%lld)\n",
399 d_inode(req->wb_context->dentry)->i_sb->s_id,
400 (unsigned long long)NFS_FILEID(d_inode(req->wb_context->dentry)),
401 req->wb_bytes,
402 (long long)req_offset(req));
403 nfs_release_request(req);
404}
405
406static void nfs_direct_read_completion(struct nfs_pgio_header *hdr)
407{
408 unsigned long bytes = 0;
409 struct nfs_direct_req *dreq = hdr->dreq;
410
411 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
412 goto out_put;
413
414 spin_lock(&dreq->lock);
415 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && (hdr->good_bytes == 0))
416 dreq->error = hdr->error;
417 else
418 nfs_direct_good_bytes(dreq, hdr);
419
420 spin_unlock(&dreq->lock);
421
422 while (!list_empty(&hdr->pages)) {
423 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
424 struct page *page = req->wb_page;
425
426 if (!PageCompound(page) && bytes < hdr->good_bytes)
427 set_page_dirty(page);
428 bytes += req->wb_bytes;
429 nfs_list_remove_request(req);
430 nfs_direct_readpage_release(req);
431 }
432out_put:
433 if (put_dreq(dreq))
434 nfs_direct_complete(dreq, false);
435 hdr->release(hdr);
436}
437
438static void nfs_read_sync_pgio_error(struct list_head *head)
439{
440 struct nfs_page *req;
441
442 while (!list_empty(head)) {
443 req = nfs_list_entry(head->next);
444 nfs_list_remove_request(req);
445 nfs_release_request(req);
446 }
447}
448
449static void nfs_direct_pgio_init(struct nfs_pgio_header *hdr)
450{
451 get_dreq(hdr->dreq);
452}
453
454static const struct nfs_pgio_completion_ops nfs_direct_read_completion_ops = {
455 .error_cleanup = nfs_read_sync_pgio_error,
456 .init_hdr = nfs_direct_pgio_init,
457 .completion = nfs_direct_read_completion,
458};
459
460
461
462
463
464
465
466
467
468static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
469 struct iov_iter *iter,
470 loff_t pos)
471{
472 struct nfs_pageio_descriptor desc;
473 struct inode *inode = dreq->inode;
474 ssize_t result = -EINVAL;
475 size_t requested_bytes = 0;
476 size_t rsize = max_t(size_t, NFS_SERVER(inode)->rsize, PAGE_SIZE);
477
478 nfs_pageio_init_read(&desc, dreq->inode, false,
479 &nfs_direct_read_completion_ops);
480 get_dreq(dreq);
481 desc.pg_dreq = dreq;
482 inode_dio_begin(inode);
483
484 while (iov_iter_count(iter)) {
485 struct page **pagevec;
486 size_t bytes;
487 size_t pgbase;
488 unsigned npages, i;
489
490 result = iov_iter_get_pages_alloc(iter, &pagevec,
491 rsize, &pgbase);
492 if (result < 0)
493 break;
494
495 bytes = result;
496 iov_iter_advance(iter, bytes);
497 npages = (result + pgbase + PAGE_SIZE - 1) / PAGE_SIZE;
498 for (i = 0; i < npages; i++) {
499 struct nfs_page *req;
500 unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase);
501
502 req = nfs_create_request(dreq->ctx, pagevec[i], NULL,
503 pgbase, req_len);
504 if (IS_ERR(req)) {
505 result = PTR_ERR(req);
506 break;
507 }
508 req->wb_index = pos >> PAGE_SHIFT;
509 req->wb_offset = pos & ~PAGE_MASK;
510 if (!nfs_pageio_add_request(&desc, req)) {
511 result = desc.pg_error;
512 nfs_release_request(req);
513 break;
514 }
515 pgbase = 0;
516 bytes -= req_len;
517 requested_bytes += req_len;
518 pos += req_len;
519 dreq->bytes_left -= req_len;
520 }
521 nfs_direct_release_pages(pagevec, npages);
522 kvfree(pagevec);
523 if (result < 0)
524 break;
525 }
526
527 nfs_pageio_complete(&desc);
528
529
530
531
532
533 if (requested_bytes == 0) {
534 inode_dio_end(inode);
535 nfs_direct_req_release(dreq);
536 return result < 0 ? result : -EIO;
537 }
538
539 if (put_dreq(dreq))
540 nfs_direct_complete(dreq, false);
541 return 0;
542}
543
544
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546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter,
565 loff_t pos)
566{
567 struct file *file = iocb->ki_filp;
568 struct address_space *mapping = file->f_mapping;
569 struct inode *inode = mapping->host;
570 struct nfs_direct_req *dreq;
571 struct nfs_lock_context *l_ctx;
572 ssize_t result = -EINVAL;
573 size_t count = iov_iter_count(iter);
574 nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count);
575
576 dfprintk(FILE, "NFS: direct read(%pD2, %zd@%Ld)\n",
577 file, count, (long long) pos);
578
579 result = 0;
580 if (!count)
581 goto out;
582
583 inode_lock(inode);
584 result = nfs_sync_mapping(mapping);
585 if (result)
586 goto out_unlock;
587
588 task_io_account_read(count);
589
590 result = -ENOMEM;
591 dreq = nfs_direct_req_alloc();
592 if (dreq == NULL)
593 goto out_unlock;
594
595 dreq->inode = inode;
596 dreq->bytes_left = count;
597 dreq->io_start = pos;
598 dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
599 l_ctx = nfs_get_lock_context(dreq->ctx);
600 if (IS_ERR(l_ctx)) {
601 result = PTR_ERR(l_ctx);
602 goto out_release;
603 }
604 dreq->l_ctx = l_ctx;
605 if (!is_sync_kiocb(iocb))
606 dreq->iocb = iocb;
607
608 NFS_I(inode)->read_io += count;
609 result = nfs_direct_read_schedule_iovec(dreq, iter, pos);
610
611 inode_unlock(inode);
612
613 if (!result) {
614 result = nfs_direct_wait(dreq);
615 if (result > 0)
616 iocb->ki_pos = pos + result;
617 }
618
619 nfs_direct_req_release(dreq);
620 return result;
621
622out_release:
623 nfs_direct_req_release(dreq);
624out_unlock:
625 inode_unlock(inode);
626out:
627 return result;
628}
629
630static void
631nfs_direct_write_scan_commit_list(struct inode *inode,
632 struct list_head *list,
633 struct nfs_commit_info *cinfo)
634{
635 spin_lock(cinfo->lock);
636#ifdef CONFIG_NFS_V4_1
637 if (cinfo->ds != NULL && cinfo->ds->nwritten != 0)
638 NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
639#endif
640 nfs_scan_commit_list(&cinfo->mds->list, list, cinfo, 0);
641 spin_unlock(cinfo->lock);
642}
643
644static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
645{
646 struct nfs_pageio_descriptor desc;
647 struct nfs_page *req, *tmp;
648 LIST_HEAD(reqs);
649 struct nfs_commit_info cinfo;
650 LIST_HEAD(failed);
651 int i;
652
653 nfs_init_cinfo_from_dreq(&cinfo, dreq);
654 nfs_direct_write_scan_commit_list(dreq->inode, &reqs, &cinfo);
655
656 dreq->count = 0;
657 for (i = 0; i < dreq->mirror_count; i++)
658 dreq->mirrors[i].count = 0;
659 get_dreq(dreq);
660
661 nfs_pageio_init_write(&desc, dreq->inode, FLUSH_STABLE, false,
662 &nfs_direct_write_completion_ops);
663 desc.pg_dreq = dreq;
664
665 req = nfs_list_entry(reqs.next);
666 nfs_direct_setup_mirroring(dreq, &desc, req);
667 if (desc.pg_error < 0) {
668 list_splice_init(&reqs, &failed);
669 goto out_failed;
670 }
671
672 list_for_each_entry_safe(req, tmp, &reqs, wb_list) {
673 if (!nfs_pageio_add_request(&desc, req)) {
674 nfs_list_remove_request(req);
675 nfs_list_add_request(req, &failed);
676 spin_lock(cinfo.lock);
677 dreq->flags = 0;
678 if (desc.pg_error < 0)
679 dreq->error = desc.pg_error;
680 else
681 dreq->error = -EIO;
682 spin_unlock(cinfo.lock);
683 }
684 nfs_release_request(req);
685 }
686 nfs_pageio_complete(&desc);
687
688out_failed:
689 while (!list_empty(&failed)) {
690 req = nfs_list_entry(failed.next);
691 nfs_list_remove_request(req);
692 nfs_unlock_and_release_request(req);
693 }
694
695 if (put_dreq(dreq))
696 nfs_direct_write_complete(dreq, dreq->inode);
697}
698
699static void nfs_direct_commit_complete(struct nfs_commit_data *data)
700{
701 struct nfs_direct_req *dreq = data->dreq;
702 struct nfs_commit_info cinfo;
703 struct nfs_page *req;
704 int status = data->task.tk_status;
705
706 nfs_init_cinfo_from_dreq(&cinfo, dreq);
707 if (status < 0) {
708 dprintk("NFS: %5u commit failed with error %d.\n",
709 data->task.tk_pid, status);
710 dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
711 } else if (nfs_direct_cmp_commit_data_verf(dreq, data)) {
712 dprintk("NFS: %5u commit verify failed\n", data->task.tk_pid);
713 dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
714 }
715
716 dprintk("NFS: %5u commit returned %d\n", data->task.tk_pid, status);
717 while (!list_empty(&data->pages)) {
718 req = nfs_list_entry(data->pages.next);
719 nfs_list_remove_request(req);
720 if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES) {
721
722 nfs_mark_request_commit(req, NULL, &cinfo, 0);
723 } else
724 nfs_release_request(req);
725 nfs_unlock_and_release_request(req);
726 }
727
728 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
729 nfs_direct_write_complete(dreq, data->inode);
730}
731
732static void nfs_direct_resched_write(struct nfs_commit_info *cinfo,
733 struct nfs_page *req)
734{
735 struct nfs_direct_req *dreq = cinfo->dreq;
736
737 spin_lock(&dreq->lock);
738 dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
739 spin_unlock(&dreq->lock);
740 nfs_mark_request_commit(req, NULL, cinfo, 0);
741}
742
743static const struct nfs_commit_completion_ops nfs_direct_commit_completion_ops = {
744 .completion = nfs_direct_commit_complete,
745 .resched_write = nfs_direct_resched_write,
746};
747
748static void nfs_direct_commit_schedule(struct nfs_direct_req *dreq)
749{
750 int res;
751 struct nfs_commit_info cinfo;
752 LIST_HEAD(mds_list);
753
754 nfs_init_cinfo_from_dreq(&cinfo, dreq);
755 nfs_scan_commit(dreq->inode, &mds_list, &cinfo);
756 res = nfs_generic_commit_list(dreq->inode, &mds_list, 0, &cinfo);
757 if (res < 0)
758 nfs_direct_write_reschedule(dreq);
759}
760
761static void nfs_direct_write_schedule_work(struct work_struct *work)
762{
763 struct nfs_direct_req *dreq = container_of(work, struct nfs_direct_req, work);
764 int flags = dreq->flags;
765
766 dreq->flags = 0;
767 switch (flags) {
768 case NFS_ODIRECT_DO_COMMIT:
769 nfs_direct_commit_schedule(dreq);
770 break;
771 case NFS_ODIRECT_RESCHED_WRITES:
772 nfs_direct_write_reschedule(dreq);
773 break;
774 default:
775 nfs_direct_complete(dreq, true);
776 }
777}
778
779static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode *inode)
780{
781 schedule_work(&dreq->work);
782}
783
784static void nfs_direct_write_completion(struct nfs_pgio_header *hdr)
785{
786 struct nfs_direct_req *dreq = hdr->dreq;
787 struct nfs_commit_info cinfo;
788 bool request_commit = false;
789 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
790
791 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
792 goto out_put;
793
794 nfs_init_cinfo_from_dreq(&cinfo, dreq);
795
796 spin_lock(&dreq->lock);
797
798 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) {
799 dreq->flags = 0;
800 dreq->error = hdr->error;
801 }
802 if (dreq->error == 0) {
803 nfs_direct_good_bytes(dreq, hdr);
804 if (nfs_write_need_commit(hdr)) {
805 if (dreq->flags == NFS_ODIRECT_RESCHED_WRITES)
806 request_commit = true;
807 else if (dreq->flags == 0) {
808 nfs_direct_set_hdr_verf(dreq, hdr);
809 request_commit = true;
810 dreq->flags = NFS_ODIRECT_DO_COMMIT;
811 } else if (dreq->flags == NFS_ODIRECT_DO_COMMIT) {
812 request_commit = true;
813 if (nfs_direct_set_or_cmp_hdr_verf(dreq, hdr))
814 dreq->flags =
815 NFS_ODIRECT_RESCHED_WRITES;
816 }
817 }
818 }
819 spin_unlock(&dreq->lock);
820
821 while (!list_empty(&hdr->pages)) {
822
823 req = nfs_list_entry(hdr->pages.next);
824 nfs_list_remove_request(req);
825 if (request_commit) {
826 kref_get(&req->wb_kref);
827 nfs_mark_request_commit(req, hdr->lseg, &cinfo,
828 hdr->ds_commit_idx);
829 }
830 nfs_unlock_and_release_request(req);
831 }
832
833out_put:
834 if (put_dreq(dreq))
835 nfs_direct_write_complete(dreq, hdr->inode);
836 hdr->release(hdr);
837}
838
839static void nfs_write_sync_pgio_error(struct list_head *head)
840{
841 struct nfs_page *req;
842
843 while (!list_empty(head)) {
844 req = nfs_list_entry(head->next);
845 nfs_list_remove_request(req);
846 nfs_unlock_and_release_request(req);
847 }
848}
849
850static void nfs_direct_write_reschedule_io(struct nfs_pgio_header *hdr)
851{
852 struct nfs_direct_req *dreq = hdr->dreq;
853
854 spin_lock(&dreq->lock);
855 if (dreq->error == 0) {
856 dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
857
858 hdr->verf.committed = NFS_UNSTABLE;
859 hdr->good_bytes = hdr->args.count;
860 }
861 spin_unlock(&dreq->lock);
862}
863
864static const struct nfs_pgio_completion_ops nfs_direct_write_completion_ops = {
865 .error_cleanup = nfs_write_sync_pgio_error,
866 .init_hdr = nfs_direct_pgio_init,
867 .completion = nfs_direct_write_completion,
868 .reschedule_io = nfs_direct_write_reschedule_io,
869};
870
871
872
873
874
875
876
877
878
879
880
881
882
883static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
884 struct iov_iter *iter,
885 loff_t pos)
886{
887 struct nfs_pageio_descriptor desc;
888 struct inode *inode = dreq->inode;
889 ssize_t result = 0;
890 size_t requested_bytes = 0;
891 size_t wsize = max_t(size_t, NFS_SERVER(inode)->wsize, PAGE_SIZE);
892
893 nfs_pageio_init_write(&desc, inode, FLUSH_COND_STABLE, false,
894 &nfs_direct_write_completion_ops);
895 desc.pg_dreq = dreq;
896 get_dreq(dreq);
897 inode_dio_begin(inode);
898
899 NFS_I(inode)->write_io += iov_iter_count(iter);
900 while (iov_iter_count(iter)) {
901 struct page **pagevec;
902 size_t bytes;
903 size_t pgbase;
904 unsigned npages, i;
905
906 result = iov_iter_get_pages_alloc(iter, &pagevec,
907 wsize, &pgbase);
908 if (result < 0)
909 break;
910
911 bytes = result;
912 iov_iter_advance(iter, bytes);
913 npages = (result + pgbase + PAGE_SIZE - 1) / PAGE_SIZE;
914 for (i = 0; i < npages; i++) {
915 struct nfs_page *req;
916 unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase);
917
918 req = nfs_create_request(dreq->ctx, pagevec[i], NULL,
919 pgbase, req_len);
920 if (IS_ERR(req)) {
921 result = PTR_ERR(req);
922 break;
923 }
924
925 nfs_direct_setup_mirroring(dreq, &desc, req);
926 if (desc.pg_error < 0) {
927 nfs_free_request(req);
928 result = desc.pg_error;
929 break;
930 }
931
932 nfs_lock_request(req);
933 req->wb_index = pos >> PAGE_SHIFT;
934 req->wb_offset = pos & ~PAGE_MASK;
935 if (!nfs_pageio_add_request(&desc, req)) {
936 result = desc.pg_error;
937 nfs_unlock_and_release_request(req);
938 break;
939 }
940 pgbase = 0;
941 bytes -= req_len;
942 requested_bytes += req_len;
943 pos += req_len;
944 dreq->bytes_left -= req_len;
945 }
946 nfs_direct_release_pages(pagevec, npages);
947 kvfree(pagevec);
948 if (result < 0)
949 break;
950 }
951 nfs_pageio_complete(&desc);
952
953
954
955
956
957 if (requested_bytes == 0) {
958 inode_dio_end(inode);
959 nfs_direct_req_release(dreq);
960 return result < 0 ? result : -EIO;
961 }
962
963 if (put_dreq(dreq))
964 nfs_direct_write_complete(dreq, dreq->inode);
965 return 0;
966}
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
990{
991 ssize_t result = -EINVAL;
992 struct file *file = iocb->ki_filp;
993 struct address_space *mapping = file->f_mapping;
994 struct inode *inode = mapping->host;
995 struct nfs_direct_req *dreq;
996 struct nfs_lock_context *l_ctx;
997 loff_t pos, end;
998
999 dfprintk(FILE, "NFS: direct write(%pD2, %zd@%Ld)\n",
1000 file, iov_iter_count(iter), (long long) iocb->ki_pos);
1001
1002 nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES,
1003 iov_iter_count(iter));
1004
1005 pos = iocb->ki_pos;
1006 end = (pos + iov_iter_count(iter) - 1) >> PAGE_SHIFT;
1007
1008 inode_lock(inode);
1009
1010 result = nfs_sync_mapping(mapping);
1011 if (result)
1012 goto out_unlock;
1013
1014 if (mapping->nrpages) {
1015 result = invalidate_inode_pages2_range(mapping,
1016 pos >> PAGE_SHIFT, end);
1017 if (result)
1018 goto out_unlock;
1019 }
1020
1021 task_io_account_write(iov_iter_count(iter));
1022
1023 result = -ENOMEM;
1024 dreq = nfs_direct_req_alloc();
1025 if (!dreq)
1026 goto out_unlock;
1027
1028 dreq->inode = inode;
1029 dreq->bytes_left = iov_iter_count(iter);
1030 dreq->io_start = pos;
1031 dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
1032 l_ctx = nfs_get_lock_context(dreq->ctx);
1033 if (IS_ERR(l_ctx)) {
1034 result = PTR_ERR(l_ctx);
1035 goto out_release;
1036 }
1037 dreq->l_ctx = l_ctx;
1038 if (!is_sync_kiocb(iocb))
1039 dreq->iocb = iocb;
1040
1041 result = nfs_direct_write_schedule_iovec(dreq, iter, pos);
1042
1043 if (mapping->nrpages) {
1044 invalidate_inode_pages2_range(mapping,
1045 pos >> PAGE_SHIFT, end);
1046 }
1047
1048 inode_unlock(inode);
1049
1050 if (!result) {
1051 result = nfs_direct_wait(dreq);
1052 if (result > 0) {
1053 struct inode *inode = mapping->host;
1054
1055 iocb->ki_pos = pos + result;
1056 spin_lock(&inode->i_lock);
1057 if (i_size_read(inode) < iocb->ki_pos)
1058 i_size_write(inode, iocb->ki_pos);
1059 spin_unlock(&inode->i_lock);
1060 generic_write_sync(file, pos, result);
1061 }
1062 }
1063 nfs_direct_req_release(dreq);
1064 return result;
1065
1066out_release:
1067 nfs_direct_req_release(dreq);
1068out_unlock:
1069 inode_unlock(inode);
1070 return result;
1071}
1072
1073
1074
1075
1076
1077int __init nfs_init_directcache(void)
1078{
1079 nfs_direct_cachep = kmem_cache_create("nfs_direct_cache",
1080 sizeof(struct nfs_direct_req),
1081 0, (SLAB_RECLAIM_ACCOUNT|
1082 SLAB_MEM_SPREAD),
1083 NULL);
1084 if (nfs_direct_cachep == NULL)
1085 return -ENOMEM;
1086
1087 return 0;
1088}
1089
1090
1091
1092
1093
1094void nfs_destroy_directcache(void)
1095{
1096 kmem_cache_destroy(nfs_direct_cachep);
1097}
1098