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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
40#include "nfstrace.h"
41
42#define NFSDBG_FACILITY NFSDBG_FILE
43
44static const struct vm_operations_struct nfs_file_vm_ops;
45
46
47#ifndef IS_SWAPFILE
48# define IS_SWAPFILE(inode) (0)
49#endif
50
51int nfs_check_flags(int flags)
52{
53 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
54 return -EINVAL;
55
56 return 0;
57}
58EXPORT_SYMBOL_GPL(nfs_check_flags);
59
60
61
62
63static int
64nfs_file_open(struct inode *inode, struct file *filp)
65{
66 int res;
67
68 dprintk("NFS: open file(%pD2)\n", filp);
69
70 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
71 res = nfs_check_flags(filp->f_flags);
72 if (res)
73 return res;
74
75 res = nfs_open(inode, filp);
76 return res;
77}
78
79int
80nfs_file_release(struct inode *inode, struct file *filp)
81{
82 dprintk("NFS: release(%pD2)\n", filp);
83
84 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
85 return nfs_release(inode, filp);
86}
87EXPORT_SYMBOL_GPL(nfs_file_release);
88
89
90
91
92
93
94
95
96
97
98
99
100static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
101{
102 struct nfs_server *server = NFS_SERVER(inode);
103 struct nfs_inode *nfsi = NFS_I(inode);
104
105 if (nfs_have_delegated_attributes(inode))
106 goto out_noreval;
107
108 if (filp->f_flags & O_DIRECT)
109 goto force_reval;
110 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
111 goto force_reval;
112 if (nfs_attribute_timeout(inode))
113 goto force_reval;
114out_noreval:
115 return 0;
116force_reval:
117 return __nfs_revalidate_inode(server, inode);
118}
119
120loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
121{
122 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
123 filp, offset, whence);
124
125
126
127
128
129 if (whence != SEEK_SET && whence != SEEK_CUR) {
130 struct inode *inode = filp->f_mapping->host;
131
132 int retval = nfs_revalidate_file_size(inode, filp);
133 if (retval < 0)
134 return (loff_t)retval;
135 }
136
137 return generic_file_llseek(filp, offset, whence);
138}
139EXPORT_SYMBOL_GPL(nfs_file_llseek);
140
141
142
143
144int
145nfs_file_flush(struct file *file, fl_owner_t id)
146{
147 struct inode *inode = file_inode(file);
148
149 dprintk("NFS: flush(%pD2)\n", file);
150
151 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
152 if ((file->f_mode & FMODE_WRITE) == 0)
153 return 0;
154
155
156
157
158
159 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
160 return filemap_fdatawrite(file->f_mapping);
161
162
163 return vfs_fsync(file, 0);
164}
165EXPORT_SYMBOL_GPL(nfs_file_flush);
166
167ssize_t
168nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
169{
170 struct inode *inode = file_inode(iocb->ki_filp);
171 ssize_t result;
172
173 if (iocb->ki_filp->f_flags & O_DIRECT)
174 return nfs_file_direct_read(iocb, to, iocb->ki_pos, true);
175
176 dprintk("NFS: read(%pD2, %zu@%lu)\n",
177 iocb->ki_filp,
178 iov_iter_count(to), (unsigned long) iocb->ki_pos);
179
180 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
181 if (!result) {
182 result = generic_file_read_iter(iocb, to);
183 if (result > 0)
184 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
185 }
186 return result;
187}
188EXPORT_SYMBOL_GPL(nfs_file_read);
189
190ssize_t
191nfs_file_splice_read(struct file *filp, loff_t *ppos,
192 struct pipe_inode_info *pipe, size_t count,
193 unsigned int flags)
194{
195 struct inode *inode = file_inode(filp);
196 ssize_t res;
197
198 dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n",
199 filp, (unsigned long) count, (unsigned long long) *ppos);
200
201 res = nfs_revalidate_mapping(inode, filp->f_mapping);
202 if (!res) {
203 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
204 if (res > 0)
205 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
206 }
207 return res;
208}
209EXPORT_SYMBOL_GPL(nfs_file_splice_read);
210
211int
212nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
213{
214 struct inode *inode = file_inode(file);
215 int status;
216
217 dprintk("NFS: mmap(%pD2)\n", file);
218
219
220
221
222 status = generic_file_mmap(file, vma);
223 if (!status) {
224 vma->vm_ops = &nfs_file_vm_ops;
225 status = nfs_revalidate_mapping(inode, file->f_mapping);
226 }
227 return status;
228}
229EXPORT_SYMBOL_GPL(nfs_file_mmap);
230
231
232
233
234
235
236
237
238
239
240
241
242
243int
244nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
245{
246 struct nfs_open_context *ctx = nfs_file_open_context(file);
247 struct inode *inode = file_inode(file);
248 int have_error, do_resend, status;
249 int ret = 0;
250
251 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
252
253 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
254 do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
255 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
256 status = nfs_commit_inode(inode, FLUSH_SYNC);
257 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
258 if (have_error) {
259 ret = xchg(&ctx->error, 0);
260 if (ret)
261 goto out;
262 }
263 if (status < 0) {
264 ret = status;
265 goto out;
266 }
267 do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
268 if (do_resend)
269 ret = -EAGAIN;
270out:
271 return ret;
272}
273EXPORT_SYMBOL_GPL(nfs_file_fsync_commit);
274
275static int
276nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
277{
278 int ret;
279 struct inode *inode = file_inode(file);
280
281 trace_nfs_fsync_enter(inode);
282
283 do {
284 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
285 if (ret != 0)
286 break;
287 mutex_lock(&inode->i_mutex);
288 ret = nfs_file_fsync_commit(file, start, end, datasync);
289 mutex_unlock(&inode->i_mutex);
290
291
292
293
294
295 start = 0;
296 end = LLONG_MAX;
297 } while (ret == -EAGAIN);
298
299 trace_nfs_fsync_exit(inode, ret);
300 return ret;
301}
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321
322
323static int nfs_want_read_modify_write(struct file *file, struct page *page,
324 loff_t pos, unsigned len)
325{
326 unsigned int pglen = nfs_page_length(page);
327 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
328 unsigned int end = offset + len;
329
330 if ((file->f_mode & FMODE_READ) &&
331 !PageUptodate(page) &&
332 !PagePrivate(page) &&
333 pglen &&
334 (end < pglen || offset))
335 return 1;
336 return 0;
337}
338
339
340
341
342
343
344
345
346
347static int nfs_write_begin(struct file *file, struct address_space *mapping,
348 loff_t pos, unsigned len, unsigned flags,
349 struct page **pagep, void **fsdata)
350{
351 int ret;
352 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
353 struct page *page;
354 int once_thru = 0;
355
356 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
357 file, mapping->host->i_ino, len, (long long) pos);
358
359start:
360
361
362
363
364 ret = wait_on_bit_action(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
365 nfs_wait_bit_killable, TASK_KILLABLE);
366 if (ret)
367 return ret;
368
369 page = grab_cache_page_write_begin(mapping, index, flags);
370 if (!page)
371 return -ENOMEM;
372 *pagep = page;
373
374 ret = nfs_flush_incompatible(file, page);
375 if (ret) {
376 unlock_page(page);
377 page_cache_release(page);
378 } else if (!once_thru &&
379 nfs_want_read_modify_write(file, page, pos, len)) {
380 once_thru = 1;
381 ret = nfs_readpage(file, page);
382 page_cache_release(page);
383 if (!ret)
384 goto start;
385 }
386 return ret;
387}
388
389static int nfs_write_end(struct file *file, struct address_space *mapping,
390 loff_t pos, unsigned len, unsigned copied,
391 struct page *page, void *fsdata)
392{
393 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
394 struct nfs_open_context *ctx = nfs_file_open_context(file);
395 int status;
396
397 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
398 file, mapping->host->i_ino, len, (long long) pos);
399
400
401
402
403
404 if (!PageUptodate(page)) {
405 unsigned pglen = nfs_page_length(page);
406 unsigned end = offset + len;
407
408 if (pglen == 0) {
409 zero_user_segments(page, 0, offset,
410 end, PAGE_CACHE_SIZE);
411 SetPageUptodate(page);
412 } else if (end >= pglen) {
413 zero_user_segment(page, end, PAGE_CACHE_SIZE);
414 if (offset == 0)
415 SetPageUptodate(page);
416 } else
417 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
418 }
419
420 status = nfs_updatepage(file, page, offset, copied);
421
422 unlock_page(page);
423 page_cache_release(page);
424
425 if (status < 0)
426 return status;
427 NFS_I(mapping->host)->write_io += copied;
428
429 if (nfs_ctx_key_to_expire(ctx)) {
430 status = nfs_wb_all(mapping->host);
431 if (status < 0)
432 return status;
433 }
434
435 return copied;
436}
437
438
439
440
441
442
443
444
445static void nfs_invalidate_page(struct page *page, unsigned int offset,
446 unsigned int length)
447{
448 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
449 page, offset, length);
450
451 if (offset != 0 || length < PAGE_CACHE_SIZE)
452 return;
453
454 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
455
456 nfs_fscache_invalidate_page(page, page->mapping->host);
457}
458
459
460
461
462
463
464
465static int nfs_release_page(struct page *page, gfp_t gfp)
466{
467 struct address_space *mapping = page->mapping;
468
469 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
470
471
472
473
474 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL &&
475 !(current->flags & PF_FSTRANS)) {
476 int how = FLUSH_SYNC;
477
478
479 if (current_is_kswapd())
480 how = 0;
481 nfs_commit_inode(mapping->host, how);
482 }
483
484 if (PagePrivate(page))
485 return 0;
486 return nfs_fscache_release_page(page, gfp);
487}
488
489static void nfs_check_dirty_writeback(struct page *page,
490 bool *dirty, bool *writeback)
491{
492 struct nfs_inode *nfsi;
493 struct address_space *mapping = page_file_mapping(page);
494
495 if (!mapping || PageSwapCache(page))
496 return;
497
498
499
500
501
502
503 nfsi = NFS_I(mapping->host);
504 if (test_bit(NFS_INO_COMMIT, &nfsi->flags)) {
505 *writeback = true;
506 return;
507 }
508
509
510
511
512
513
514 if (PagePrivate(page))
515 *dirty = true;
516}
517
518
519
520
521
522
523
524
525
526static int nfs_launder_page(struct page *page)
527{
528 struct inode *inode = page_file_mapping(page)->host;
529 struct nfs_inode *nfsi = NFS_I(inode);
530
531 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
532 inode->i_ino, (long long)page_offset(page));
533
534 nfs_fscache_wait_on_page_write(nfsi, page);
535 return nfs_wb_page(inode, page);
536}
537
538#ifdef CONFIG_NFS_SWAP
539static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
540 sector_t *span)
541{
542 *span = sis->pages;
543 return xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 1);
544}
545
546static void nfs_swap_deactivate(struct file *file)
547{
548 xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 0);
549}
550#endif
551
552const struct address_space_operations nfs_file_aops = {
553 .readpage = nfs_readpage,
554 .readpages = nfs_readpages,
555 .set_page_dirty = __set_page_dirty_nobuffers,
556 .writepage = nfs_writepage,
557 .writepages = nfs_writepages,
558 .write_begin = nfs_write_begin,
559 .write_end = nfs_write_end,
560 .invalidatepage = nfs_invalidate_page,
561 .releasepage = nfs_release_page,
562 .direct_IO = nfs_direct_IO,
563 .migratepage = nfs_migrate_page,
564 .launder_page = nfs_launder_page,
565 .is_dirty_writeback = nfs_check_dirty_writeback,
566 .error_remove_page = generic_error_remove_page,
567#ifdef CONFIG_NFS_SWAP
568 .swap_activate = nfs_swap_activate,
569 .swap_deactivate = nfs_swap_deactivate,
570#endif
571};
572
573
574
575
576
577
578static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
579{
580 struct page *page = vmf->page;
581 struct file *filp = vma->vm_file;
582 struct inode *inode = file_inode(filp);
583 unsigned pagelen;
584 int ret = VM_FAULT_NOPAGE;
585 struct address_space *mapping;
586
587 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
588 filp, filp->f_mapping->host->i_ino,
589 (long long)page_offset(page));
590
591
592 nfs_fscache_wait_on_page_write(NFS_I(inode), page);
593
594 lock_page(page);
595 mapping = page_file_mapping(page);
596 if (mapping != inode->i_mapping)
597 goto out_unlock;
598
599 wait_on_page_writeback(page);
600
601 pagelen = nfs_page_length(page);
602 if (pagelen == 0)
603 goto out_unlock;
604
605 ret = VM_FAULT_LOCKED;
606 if (nfs_flush_incompatible(filp, page) == 0 &&
607 nfs_updatepage(filp, page, 0, pagelen) == 0)
608 goto out;
609
610 ret = VM_FAULT_SIGBUS;
611out_unlock:
612 unlock_page(page);
613out:
614 return ret;
615}
616
617static const struct vm_operations_struct nfs_file_vm_ops = {
618 .fault = filemap_fault,
619 .map_pages = filemap_map_pages,
620 .page_mkwrite = nfs_vm_page_mkwrite,
621 .remap_pages = generic_file_remap_pages,
622};
623
624static int nfs_need_sync_write(struct file *filp, struct inode *inode)
625{
626 struct nfs_open_context *ctx;
627
628 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
629 return 1;
630 ctx = nfs_file_open_context(filp);
631 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
632 nfs_ctx_key_to_expire(ctx))
633 return 1;
634 return 0;
635}
636
637ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
638{
639 struct file *file = iocb->ki_filp;
640 struct inode *inode = file_inode(file);
641 unsigned long written = 0;
642 ssize_t result;
643 size_t count = iov_iter_count(from);
644 loff_t pos = iocb->ki_pos;
645
646 result = nfs_key_timeout_notify(file, inode);
647 if (result)
648 return result;
649
650 if (file->f_flags & O_DIRECT)
651 return nfs_file_direct_write(iocb, from, pos, true);
652
653 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
654 file, count, (long long) pos);
655
656 result = -EBUSY;
657 if (IS_SWAPFILE(inode))
658 goto out_swapfile;
659
660
661
662 if (file->f_flags & O_APPEND) {
663 result = nfs_revalidate_file_size(inode, file);
664 if (result)
665 goto out;
666 }
667
668 result = count;
669 if (!count)
670 goto out;
671
672 result = generic_file_write_iter(iocb, from);
673 if (result > 0)
674 written = result;
675
676
677 if (result >= 0 && nfs_need_sync_write(file, inode)) {
678 int err = vfs_fsync(file, 0);
679 if (err < 0)
680 result = err;
681 }
682 if (result > 0)
683 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
684out:
685 return result;
686
687out_swapfile:
688 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
689 goto out;
690}
691EXPORT_SYMBOL_GPL(nfs_file_write);
692
693static int
694do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
695{
696 struct inode *inode = filp->f_mapping->host;
697 int status = 0;
698 unsigned int saved_type = fl->fl_type;
699
700
701 posix_test_lock(filp, fl);
702 if (fl->fl_type != F_UNLCK) {
703
704 goto out;
705 }
706 fl->fl_type = saved_type;
707
708 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
709 goto out_noconflict;
710
711 if (is_local)
712 goto out_noconflict;
713
714 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
715out:
716 return status;
717out_noconflict:
718 fl->fl_type = F_UNLCK;
719 goto out;
720}
721
722static int do_vfs_lock(struct file *file, struct file_lock *fl)
723{
724 int res = 0;
725 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
726 case FL_POSIX:
727 res = posix_lock_file_wait(file, fl);
728 break;
729 case FL_FLOCK:
730 res = flock_lock_file_wait(file, fl);
731 break;
732 default:
733 BUG();
734 }
735 return res;
736}
737
738static int
739do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
740{
741 struct inode *inode = filp->f_mapping->host;
742 struct nfs_lock_context *l_ctx;
743 int status;
744
745
746
747
748
749 nfs_sync_mapping(filp->f_mapping);
750
751 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
752 if (!IS_ERR(l_ctx)) {
753 status = nfs_iocounter_wait(&l_ctx->io_count);
754 nfs_put_lock_context(l_ctx);
755 if (status < 0)
756 return status;
757 }
758
759
760
761
762
763
764
765
766
767 if (!is_local)
768 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
769 else
770 status = do_vfs_lock(filp, fl);
771 return status;
772}
773
774static int
775is_time_granular(struct timespec *ts) {
776 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
777}
778
779static int
780do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
781{
782 struct inode *inode = filp->f_mapping->host;
783 int status;
784
785
786
787
788
789 status = nfs_sync_mapping(filp->f_mapping);
790 if (status != 0)
791 goto out;
792
793
794
795
796
797 if (!is_local)
798 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
799 else
800 status = do_vfs_lock(filp, fl);
801 if (status < 0)
802 goto out;
803
804
805
806
807
808
809
810
811 nfs_sync_mapping(filp->f_mapping);
812 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
813 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
814 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
815 else
816 nfs_zap_caches(inode);
817 }
818out:
819 return status;
820}
821
822
823
824
825int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
826{
827 struct inode *inode = filp->f_mapping->host;
828 int ret = -ENOLCK;
829 int is_local = 0;
830
831 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
832 filp, fl->fl_type, fl->fl_flags,
833 (long long)fl->fl_start, (long long)fl->fl_end);
834
835 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
836
837
838 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
839 goto out_err;
840
841 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
842 is_local = 1;
843
844 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
845 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
846 if (ret < 0)
847 goto out_err;
848 }
849
850 if (IS_GETLK(cmd))
851 ret = do_getlk(filp, cmd, fl, is_local);
852 else if (fl->fl_type == F_UNLCK)
853 ret = do_unlk(filp, cmd, fl, is_local);
854 else
855 ret = do_setlk(filp, cmd, fl, is_local);
856out_err:
857 return ret;
858}
859EXPORT_SYMBOL_GPL(nfs_lock);
860
861
862
863
864int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
865{
866 struct inode *inode = filp->f_mapping->host;
867 int is_local = 0;
868
869 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
870 filp, fl->fl_type, fl->fl_flags);
871
872 if (!(fl->fl_flags & FL_FLOCK))
873 return -ENOLCK;
874
875
876
877
878
879
880
881 if (fl->fl_type & LOCK_MAND)
882 return -EINVAL;
883
884 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
885 is_local = 1;
886
887
888 if (fl->fl_type == F_UNLCK)
889 return do_unlk(filp, cmd, fl, is_local);
890 return do_setlk(filp, cmd, fl, is_local);
891}
892EXPORT_SYMBOL_GPL(nfs_flock);
893
894
895
896
897
898int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
899{
900 dprintk("NFS: setlease(%pD2, arg=%ld)\n", file, arg);
901 return -EINVAL;
902}
903EXPORT_SYMBOL_GPL(nfs_setlease);
904
905const struct file_operations nfs_file_operations = {
906 .llseek = nfs_file_llseek,
907 .read = new_sync_read,
908 .write = new_sync_write,
909 .read_iter = nfs_file_read,
910 .write_iter = nfs_file_write,
911 .mmap = nfs_file_mmap,
912 .open = nfs_file_open,
913 .flush = nfs_file_flush,
914 .release = nfs_file_release,
915 .fsync = nfs_file_fsync,
916 .lock = nfs_lock,
917 .flock = nfs_flock,
918 .splice_read = nfs_file_splice_read,
919 .splice_write = iter_file_splice_write,
920 .check_flags = nfs_check_flags,
921 .setlease = nfs_setlease,
922};
923EXPORT_SYMBOL_GPL(nfs_file_operations);
924