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19#include <linux/module.h>
20#include <linux/time.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/fcntl.h>
24#include <linux/stat.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/mm.h>
28#include <linux/pagemap.h>
29#include <linux/aio.h>
30#include <linux/gfp.h>
31#include <linux/swap.h>
32
33#include <asm/uaccess.h>
34
35#include "delegation.h"
36#include "internal.h"
37#include "iostat.h"
38#include "fscache.h"
39#include "pnfs.h"
40
41#include "nfstrace.h"
42
43#define NFSDBG_FACILITY NFSDBG_FILE
44
45static const struct vm_operations_struct nfs_file_vm_ops;
46
47
48#ifndef IS_SWAPFILE
49# define IS_SWAPFILE(inode) (0)
50#endif
51
52int nfs_check_flags(int flags)
53{
54 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
55 return -EINVAL;
56
57 return 0;
58}
59EXPORT_SYMBOL_GPL(nfs_check_flags);
60
61
62
63
64static int
65nfs_file_open(struct inode *inode, struct file *filp)
66{
67 int res;
68
69 dprintk("NFS: open file(%pD2)\n", filp);
70
71 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
72 res = nfs_check_flags(filp->f_flags);
73 if (res)
74 return res;
75
76 res = nfs_open(inode, filp);
77 return res;
78}
79
80int
81nfs_file_release(struct inode *inode, struct file *filp)
82{
83 dprintk("NFS: release(%pD2)\n", filp);
84
85 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
86 return nfs_release(inode, filp);
87}
88EXPORT_SYMBOL_GPL(nfs_file_release);
89
90
91
92
93
94
95
96
97
98
99
100
101static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
102{
103 struct nfs_server *server = NFS_SERVER(inode);
104 struct nfs_inode *nfsi = NFS_I(inode);
105
106 if (nfs_have_delegated_attributes(inode))
107 goto out_noreval;
108
109 if (filp->f_flags & O_DIRECT)
110 goto force_reval;
111 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
112 goto force_reval;
113 if (nfs_attribute_timeout(inode))
114 goto force_reval;
115out_noreval:
116 return 0;
117force_reval:
118 return __nfs_revalidate_inode(server, inode);
119}
120
121loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
122{
123 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
124 filp, offset, whence);
125
126
127
128
129
130 if (whence != SEEK_SET && whence != SEEK_CUR) {
131 struct inode *inode = filp->f_mapping->host;
132
133 int retval = nfs_revalidate_file_size(inode, filp);
134 if (retval < 0)
135 return (loff_t)retval;
136 }
137
138 return generic_file_llseek(filp, offset, whence);
139}
140EXPORT_SYMBOL_GPL(nfs_file_llseek);
141
142
143
144
145int
146nfs_file_flush(struct file *file, fl_owner_t id)
147{
148 struct inode *inode = file_inode(file);
149
150 dprintk("NFS: flush(%pD2)\n", file);
151
152 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
153 if ((file->f_mode & FMODE_WRITE) == 0)
154 return 0;
155
156
157
158
159
160 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
161 return filemap_fdatawrite(file->f_mapping);
162
163
164 return vfs_fsync(file, 0);
165}
166EXPORT_SYMBOL_GPL(nfs_file_flush);
167
168ssize_t
169nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
170{
171 struct inode *inode = file_inode(iocb->ki_filp);
172 ssize_t result;
173
174 if (iocb->ki_filp->f_flags & O_DIRECT)
175 return nfs_file_direct_read(iocb, to, iocb->ki_pos);
176
177 dprintk("NFS: read(%pD2, %zu@%lu)\n",
178 iocb->ki_filp,
179 iov_iter_count(to), (unsigned long) iocb->ki_pos);
180
181 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
182 if (!result) {
183 result = generic_file_read_iter(iocb, to);
184 if (result > 0)
185 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
186 }
187 return result;
188}
189EXPORT_SYMBOL_GPL(nfs_file_read);
190
191ssize_t
192nfs_file_splice_read(struct file *filp, loff_t *ppos,
193 struct pipe_inode_info *pipe, size_t count,
194 unsigned int flags)
195{
196 struct inode *inode = file_inode(filp);
197 ssize_t res;
198
199 dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n",
200 filp, (unsigned long) count, (unsigned long long) *ppos);
201
202 res = nfs_revalidate_mapping(inode, filp->f_mapping);
203 if (!res) {
204 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
205 if (res > 0)
206 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
207 }
208 return res;
209}
210EXPORT_SYMBOL_GPL(nfs_file_splice_read);
211
212int
213nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
214{
215 struct inode *inode = file_inode(file);
216 int status;
217
218 dprintk("NFS: mmap(%pD2)\n", file);
219
220
221
222
223 status = generic_file_mmap(file, vma);
224 if (!status) {
225 vma->vm_ops = &nfs_file_vm_ops;
226 status = nfs_revalidate_mapping(inode, file->f_mapping);
227 }
228 return status;
229}
230EXPORT_SYMBOL_GPL(nfs_file_mmap);
231
232
233
234
235
236
237
238
239
240
241
242
243
244int
245nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
246{
247 struct nfs_open_context *ctx = nfs_file_open_context(file);
248 struct inode *inode = file_inode(file);
249 int have_error, do_resend, status;
250 int ret = 0;
251
252 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
253
254 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
255 do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
256 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
257 status = nfs_commit_inode(inode, FLUSH_SYNC);
258 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
259 if (have_error) {
260 ret = xchg(&ctx->error, 0);
261 if (ret)
262 goto out;
263 }
264 if (status < 0) {
265 ret = status;
266 goto out;
267 }
268 do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
269 if (do_resend)
270 ret = -EAGAIN;
271out:
272 return ret;
273}
274EXPORT_SYMBOL_GPL(nfs_file_fsync_commit);
275
276static int
277nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
278{
279 int ret;
280 struct inode *inode = file_inode(file);
281
282 trace_nfs_fsync_enter(inode);
283
284 do {
285 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
286 if (ret != 0)
287 break;
288 mutex_lock(&inode->i_mutex);
289 ret = nfs_file_fsync_commit(file, start, end, datasync);
290 mutex_unlock(&inode->i_mutex);
291
292
293
294
295
296 start = 0;
297 end = LLONG_MAX;
298 } while (ret == -EAGAIN);
299
300 trace_nfs_fsync_exit(inode, ret);
301 return ret;
302}
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323
324static int nfs_want_read_modify_write(struct file *file, struct page *page,
325 loff_t pos, unsigned len)
326{
327 unsigned int pglen = nfs_page_length(page);
328 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
329 unsigned int end = offset + len;
330
331 if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
332 if (!PageUptodate(page))
333 return 1;
334 return 0;
335 }
336
337 if ((file->f_mode & FMODE_READ) &&
338 !PageUptodate(page) &&
339 !PagePrivate(page) &&
340 pglen &&
341 (end < pglen || offset))
342 return 1;
343 return 0;
344}
345
346
347
348
349
350
351
352
353
354static int nfs_write_begin(struct file *file, struct address_space *mapping,
355 loff_t pos, unsigned len, unsigned flags,
356 struct page **pagep, void **fsdata)
357{
358 int ret;
359 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
360 struct page *page;
361 int once_thru = 0;
362
363 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
364 file, mapping->host->i_ino, len, (long long) pos);
365
366start:
367
368
369
370
371 ret = wait_on_bit_action(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
372 nfs_wait_bit_killable, TASK_KILLABLE);
373 if (ret)
374 return ret;
375
376 page = grab_cache_page_write_begin(mapping, index, flags);
377 if (!page)
378 return -ENOMEM;
379 *pagep = page;
380
381 ret = nfs_flush_incompatible(file, page);
382 if (ret) {
383 unlock_page(page);
384 page_cache_release(page);
385 } else if (!once_thru &&
386 nfs_want_read_modify_write(file, page, pos, len)) {
387 once_thru = 1;
388 ret = nfs_readpage(file, page);
389 page_cache_release(page);
390 if (!ret)
391 goto start;
392 }
393 return ret;
394}
395
396static int nfs_write_end(struct file *file, struct address_space *mapping,
397 loff_t pos, unsigned len, unsigned copied,
398 struct page *page, void *fsdata)
399{
400 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
401 struct nfs_open_context *ctx = nfs_file_open_context(file);
402 int status;
403
404 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
405 file, mapping->host->i_ino, len, (long long) pos);
406
407
408
409
410
411 if (!PageUptodate(page)) {
412 unsigned pglen = nfs_page_length(page);
413 unsigned end = offset + len;
414
415 if (pglen == 0) {
416 zero_user_segments(page, 0, offset,
417 end, PAGE_CACHE_SIZE);
418 SetPageUptodate(page);
419 } else if (end >= pglen) {
420 zero_user_segment(page, end, PAGE_CACHE_SIZE);
421 if (offset == 0)
422 SetPageUptodate(page);
423 } else
424 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
425 }
426
427 status = nfs_updatepage(file, page, offset, copied);
428
429 unlock_page(page);
430 page_cache_release(page);
431
432 if (status < 0)
433 return status;
434 NFS_I(mapping->host)->write_io += copied;
435
436 if (nfs_ctx_key_to_expire(ctx)) {
437 status = nfs_wb_all(mapping->host);
438 if (status < 0)
439 return status;
440 }
441
442 return copied;
443}
444
445
446
447
448
449
450
451
452static void nfs_invalidate_page(struct page *page, unsigned int offset,
453 unsigned int length)
454{
455 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
456 page, offset, length);
457
458 if (offset != 0 || length < PAGE_CACHE_SIZE)
459 return;
460
461 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
462
463 nfs_fscache_invalidate_page(page, page->mapping->host);
464}
465
466
467
468
469
470
471
472static int nfs_release_page(struct page *page, gfp_t gfp)
473{
474 struct address_space *mapping = page->mapping;
475
476 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
477
478
479
480
481
482
483
484
485
486
487 if (mapping) {
488 struct nfs_server *nfss = NFS_SERVER(mapping->host);
489 nfs_commit_inode(mapping->host, 0);
490 if ((gfp & __GFP_WAIT) &&
491 !bdi_write_congested(&nfss->backing_dev_info)) {
492 wait_on_page_bit_killable_timeout(page, PG_private,
493 HZ);
494 if (PagePrivate(page))
495 set_bdi_congested(&nfss->backing_dev_info,
496 BLK_RW_ASYNC);
497 }
498 }
499
500 if (PagePrivate(page))
501 return 0;
502 return nfs_fscache_release_page(page, gfp);
503}
504
505static void nfs_check_dirty_writeback(struct page *page,
506 bool *dirty, bool *writeback)
507{
508 struct nfs_inode *nfsi;
509 struct address_space *mapping = page_file_mapping(page);
510
511 if (!mapping || PageSwapCache(page))
512 return;
513
514
515
516
517
518
519 nfsi = NFS_I(mapping->host);
520 if (test_bit(NFS_INO_COMMIT, &nfsi->flags)) {
521 *writeback = true;
522 return;
523 }
524
525
526
527
528
529
530 if (PagePrivate(page))
531 *dirty = true;
532}
533
534
535
536
537
538
539
540
541
542static int nfs_launder_page(struct page *page)
543{
544 struct inode *inode = page_file_mapping(page)->host;
545 struct nfs_inode *nfsi = NFS_I(inode);
546
547 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
548 inode->i_ino, (long long)page_offset(page));
549
550 nfs_fscache_wait_on_page_write(nfsi, page);
551 return nfs_wb_page(inode, page);
552}
553
554#ifdef CONFIG_NFS_SWAP
555static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
556 sector_t *span)
557{
558 int ret;
559 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
560
561 *span = sis->pages;
562
563 rcu_read_lock();
564 ret = xs_swapper(rcu_dereference(clnt->cl_xprt), 1);
565 rcu_read_unlock();
566
567 return ret;
568}
569
570static void nfs_swap_deactivate(struct file *file)
571{
572 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
573
574 rcu_read_lock();
575 xs_swapper(rcu_dereference(clnt->cl_xprt), 0);
576 rcu_read_unlock();
577}
578#endif
579
580const struct address_space_operations nfs_file_aops = {
581 .readpage = nfs_readpage,
582 .readpages = nfs_readpages,
583 .set_page_dirty = __set_page_dirty_nobuffers,
584 .writepage = nfs_writepage,
585 .writepages = nfs_writepages,
586 .write_begin = nfs_write_begin,
587 .write_end = nfs_write_end,
588 .invalidatepage = nfs_invalidate_page,
589 .releasepage = nfs_release_page,
590 .direct_IO = nfs_direct_IO,
591 .migratepage = nfs_migrate_page,
592 .launder_page = nfs_launder_page,
593 .is_dirty_writeback = nfs_check_dirty_writeback,
594 .error_remove_page = generic_error_remove_page,
595#ifdef CONFIG_NFS_SWAP
596 .swap_activate = nfs_swap_activate,
597 .swap_deactivate = nfs_swap_deactivate,
598#endif
599};
600
601
602
603
604
605
606static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
607{
608 struct page *page = vmf->page;
609 struct file *filp = vma->vm_file;
610 struct inode *inode = file_inode(filp);
611 unsigned pagelen;
612 int ret = VM_FAULT_NOPAGE;
613 struct address_space *mapping;
614
615 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
616 filp, filp->f_mapping->host->i_ino,
617 (long long)page_offset(page));
618
619
620 nfs_fscache_wait_on_page_write(NFS_I(inode), page);
621
622 lock_page(page);
623 mapping = page_file_mapping(page);
624 if (mapping != inode->i_mapping)
625 goto out_unlock;
626
627 wait_on_page_writeback(page);
628
629 pagelen = nfs_page_length(page);
630 if (pagelen == 0)
631 goto out_unlock;
632
633 ret = VM_FAULT_LOCKED;
634 if (nfs_flush_incompatible(filp, page) == 0 &&
635 nfs_updatepage(filp, page, 0, pagelen) == 0)
636 goto out;
637
638 ret = VM_FAULT_SIGBUS;
639out_unlock:
640 unlock_page(page);
641out:
642 return ret;
643}
644
645static const struct vm_operations_struct nfs_file_vm_ops = {
646 .fault = filemap_fault,
647 .map_pages = filemap_map_pages,
648 .page_mkwrite = nfs_vm_page_mkwrite,
649 .remap_pages = generic_file_remap_pages,
650};
651
652static int nfs_need_sync_write(struct file *filp, struct inode *inode)
653{
654 struct nfs_open_context *ctx;
655
656 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
657 return 1;
658 ctx = nfs_file_open_context(filp);
659 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
660 nfs_ctx_key_to_expire(ctx))
661 return 1;
662 return 0;
663}
664
665ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
666{
667 struct file *file = iocb->ki_filp;
668 struct inode *inode = file_inode(file);
669 unsigned long written = 0;
670 ssize_t result;
671 size_t count = iov_iter_count(from);
672 loff_t pos = iocb->ki_pos;
673
674 result = nfs_key_timeout_notify(file, inode);
675 if (result)
676 return result;
677
678 if (file->f_flags & O_DIRECT)
679 return nfs_file_direct_write(iocb, from, pos);
680
681 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
682 file, count, (long long) pos);
683
684 result = -EBUSY;
685 if (IS_SWAPFILE(inode))
686 goto out_swapfile;
687
688
689
690 if (file->f_flags & O_APPEND) {
691 result = nfs_revalidate_file_size(inode, file);
692 if (result)
693 goto out;
694 }
695
696 result = count;
697 if (!count)
698 goto out;
699
700 result = generic_file_write_iter(iocb, from);
701 if (result > 0)
702 written = result;
703
704
705 if (result >= 0 && nfs_need_sync_write(file, inode)) {
706 int err = vfs_fsync(file, 0);
707 if (err < 0)
708 result = err;
709 }
710 if (result > 0)
711 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
712out:
713 return result;
714
715out_swapfile:
716 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
717 goto out;
718}
719EXPORT_SYMBOL_GPL(nfs_file_write);
720
721static int
722do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
723{
724 struct inode *inode = filp->f_mapping->host;
725 int status = 0;
726 unsigned int saved_type = fl->fl_type;
727
728
729 posix_test_lock(filp, fl);
730 if (fl->fl_type != F_UNLCK) {
731
732 goto out;
733 }
734 fl->fl_type = saved_type;
735
736 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
737 goto out_noconflict;
738
739 if (is_local)
740 goto out_noconflict;
741
742 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
743out:
744 return status;
745out_noconflict:
746 fl->fl_type = F_UNLCK;
747 goto out;
748}
749
750static int do_vfs_lock(struct file *file, struct file_lock *fl)
751{
752 int res = 0;
753 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
754 case FL_POSIX:
755 res = posix_lock_file_wait(file, fl);
756 break;
757 case FL_FLOCK:
758 res = flock_lock_file_wait(file, fl);
759 break;
760 default:
761 BUG();
762 }
763 return res;
764}
765
766static int
767do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
768{
769 struct inode *inode = filp->f_mapping->host;
770 struct nfs_lock_context *l_ctx;
771 int status;
772
773
774
775
776
777 nfs_sync_mapping(filp->f_mapping);
778
779 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
780 if (!IS_ERR(l_ctx)) {
781 status = nfs_iocounter_wait(&l_ctx->io_count);
782 nfs_put_lock_context(l_ctx);
783 if (status < 0)
784 return status;
785 }
786
787
788
789
790
791
792
793
794
795 if (!is_local)
796 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
797 else
798 status = do_vfs_lock(filp, fl);
799 return status;
800}
801
802static int
803is_time_granular(struct timespec *ts) {
804 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
805}
806
807static int
808do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
809{
810 struct inode *inode = filp->f_mapping->host;
811 int status;
812
813
814
815
816
817 status = nfs_sync_mapping(filp->f_mapping);
818 if (status != 0)
819 goto out;
820
821
822
823
824
825 if (!is_local)
826 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
827 else
828 status = do_vfs_lock(filp, fl);
829 if (status < 0)
830 goto out;
831
832
833
834
835
836
837
838
839 nfs_sync_mapping(filp->f_mapping);
840 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
841 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
842 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
843 else
844 nfs_zap_caches(inode);
845 }
846out:
847 return status;
848}
849
850
851
852
853int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
854{
855 struct inode *inode = filp->f_mapping->host;
856 int ret = -ENOLCK;
857 int is_local = 0;
858
859 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
860 filp, fl->fl_type, fl->fl_flags,
861 (long long)fl->fl_start, (long long)fl->fl_end);
862
863 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
864
865
866 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
867 goto out_err;
868
869 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
870 is_local = 1;
871
872 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
873 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
874 if (ret < 0)
875 goto out_err;
876 }
877
878 if (IS_GETLK(cmd))
879 ret = do_getlk(filp, cmd, fl, is_local);
880 else if (fl->fl_type == F_UNLCK)
881 ret = do_unlk(filp, cmd, fl, is_local);
882 else
883 ret = do_setlk(filp, cmd, fl, is_local);
884out_err:
885 return ret;
886}
887EXPORT_SYMBOL_GPL(nfs_lock);
888
889
890
891
892int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
893{
894 struct inode *inode = filp->f_mapping->host;
895 int is_local = 0;
896
897 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
898 filp, fl->fl_type, fl->fl_flags);
899
900 if (!(fl->fl_flags & FL_FLOCK))
901 return -ENOLCK;
902
903
904
905
906
907
908
909 if (fl->fl_type & LOCK_MAND)
910 return -EINVAL;
911
912 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
913 is_local = 1;
914
915
916 if (fl->fl_type == F_UNLCK)
917 return do_unlk(filp, cmd, fl, is_local);
918 return do_setlk(filp, cmd, fl, is_local);
919}
920EXPORT_SYMBOL_GPL(nfs_flock);
921
922const struct file_operations nfs_file_operations = {
923 .llseek = nfs_file_llseek,
924 .read = new_sync_read,
925 .write = new_sync_write,
926 .read_iter = nfs_file_read,
927 .write_iter = nfs_file_write,
928 .mmap = nfs_file_mmap,
929 .open = nfs_file_open,
930 .flush = nfs_file_flush,
931 .release = nfs_file_release,
932 .fsync = nfs_file_fsync,
933 .lock = nfs_lock,
934 .flock = nfs_flock,
935 .splice_read = nfs_file_splice_read,
936 .splice_write = iter_file_splice_write,
937 .check_flags = nfs_check_flags,
938 .setlease = simple_nosetlease,
939};
940EXPORT_SYMBOL_GPL(nfs_file_operations);
941