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20#include <linux/module.h>
21#include <linux/time.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/fcntl.h>
25#include <linux/stat.h>
26#include <linux/nfs_fs.h>
27#include <linux/nfs_mount.h>
28#include <linux/mm.h>
29#include <linux/pagemap.h>
30#include <linux/gfp.h>
31#include <linux/swap.h>
32
33#include <linux/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 nfs_file_clear_open_context(filp);
87 return 0;
88}
89EXPORT_SYMBOL_GPL(nfs_file_release);
90
91
92
93
94
95
96
97
98
99
100
101
102static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
103{
104 struct nfs_server *server = NFS_SERVER(inode);
105
106 if (filp->f_flags & O_DIRECT)
107 goto force_reval;
108 if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_SIZE))
109 goto force_reval;
110 return 0;
111force_reval:
112 return __nfs_revalidate_inode(server, inode);
113}
114
115loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
116{
117 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
118 filp, offset, whence);
119
120
121
122
123
124 if (whence != SEEK_SET && whence != SEEK_CUR) {
125 struct inode *inode = filp->f_mapping->host;
126
127 int retval = nfs_revalidate_file_size(inode, filp);
128 if (retval < 0)
129 return (loff_t)retval;
130 }
131
132 return generic_file_llseek(filp, offset, whence);
133}
134EXPORT_SYMBOL_GPL(nfs_file_llseek);
135
136
137
138
139static int
140nfs_file_flush(struct file *file, fl_owner_t id)
141{
142 struct inode *inode = file_inode(file);
143 errseq_t since;
144
145 dprintk("NFS: flush(%pD2)\n", file);
146
147 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
148 if ((file->f_mode & FMODE_WRITE) == 0)
149 return 0;
150
151
152 since = filemap_sample_wb_err(file->f_mapping);
153 nfs_wb_all(inode);
154 return filemap_check_wb_err(file->f_mapping, since);
155}
156
157ssize_t
158nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
159{
160 struct inode *inode = file_inode(iocb->ki_filp);
161 ssize_t result;
162
163 if (iocb->ki_flags & IOCB_DIRECT)
164 return nfs_file_direct_read(iocb, to);
165
166 dprintk("NFS: read(%pD2, %zu@%lu)\n",
167 iocb->ki_filp,
168 iov_iter_count(to), (unsigned long) iocb->ki_pos);
169
170 nfs_start_io_read(inode);
171 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
172 if (!result) {
173 result = generic_file_read_iter(iocb, to);
174 if (result > 0)
175 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
176 }
177 nfs_end_io_read(inode);
178 return result;
179}
180EXPORT_SYMBOL_GPL(nfs_file_read);
181
182int
183nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
184{
185 struct inode *inode = file_inode(file);
186 int status;
187
188 dprintk("NFS: mmap(%pD2)\n", file);
189
190
191
192
193 status = generic_file_mmap(file, vma);
194 if (!status) {
195 vma->vm_ops = &nfs_file_vm_ops;
196 status = nfs_revalidate_mapping(inode, file->f_mapping);
197 }
198 return status;
199}
200EXPORT_SYMBOL_GPL(nfs_file_mmap);
201
202
203
204
205
206
207static int
208nfs_file_fsync_commit(struct file *file, int datasync)
209{
210 struct inode *inode = file_inode(file);
211 int ret;
212
213 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
214
215 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
216 ret = nfs_commit_inode(inode, FLUSH_SYNC);
217 if (ret < 0)
218 return ret;
219 return file_check_and_advance_wb_err(file);
220}
221
222int
223nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
224{
225 struct nfs_open_context *ctx = nfs_file_open_context(file);
226 struct inode *inode = file_inode(file);
227 int ret;
228
229 trace_nfs_fsync_enter(inode);
230
231 for (;;) {
232 ret = file_write_and_wait_range(file, start, end);
233 if (ret != 0)
234 break;
235 ret = nfs_file_fsync_commit(file, datasync);
236 if (ret != 0)
237 break;
238 ret = pnfs_sync_inode(inode, !!datasync);
239 if (ret != 0)
240 break;
241 if (!test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags))
242 break;
243
244
245
246
247
248 start = 0;
249 end = LLONG_MAX;
250 }
251
252 trace_nfs_fsync_exit(inode, ret);
253 return ret;
254}
255EXPORT_SYMBOL_GPL(nfs_file_fsync);
256
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281
282
283static bool nfs_full_page_write(struct page *page, loff_t pos, unsigned int len)
284{
285 unsigned int pglen = nfs_page_length(page);
286 unsigned int offset = pos & (PAGE_SIZE - 1);
287 unsigned int end = offset + len;
288
289 return !pglen || (end >= pglen && !offset);
290}
291
292static bool nfs_want_read_modify_write(struct file *file, struct page *page,
293 loff_t pos, unsigned int len)
294{
295
296
297
298
299 if (PageUptodate(page) || PagePrivate(page) ||
300 nfs_full_page_write(page, pos, len))
301 return false;
302
303 if (pnfs_ld_read_whole_page(file->f_mapping->host))
304 return true;
305
306 if (file->f_mode & FMODE_READ)
307 return true;
308 return false;
309}
310
311
312
313
314
315
316
317
318
319static int nfs_write_begin(struct file *file, struct address_space *mapping,
320 loff_t pos, unsigned len, unsigned flags,
321 struct page **pagep, void **fsdata)
322{
323 int ret;
324 pgoff_t index = pos >> PAGE_SHIFT;
325 struct page *page;
326 int once_thru = 0;
327
328 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
329 file, mapping->host->i_ino, len, (long long) pos);
330
331start:
332 page = grab_cache_page_write_begin(mapping, index, flags);
333 if (!page)
334 return -ENOMEM;
335 *pagep = page;
336
337 ret = nfs_flush_incompatible(file, page);
338 if (ret) {
339 unlock_page(page);
340 put_page(page);
341 } else if (!once_thru &&
342 nfs_want_read_modify_write(file, page, pos, len)) {
343 once_thru = 1;
344 ret = nfs_readpage(file, page);
345 put_page(page);
346 if (!ret)
347 goto start;
348 }
349 return ret;
350}
351
352static int nfs_write_end(struct file *file, struct address_space *mapping,
353 loff_t pos, unsigned len, unsigned copied,
354 struct page *page, void *fsdata)
355{
356 unsigned offset = pos & (PAGE_SIZE - 1);
357 struct nfs_open_context *ctx = nfs_file_open_context(file);
358 int status;
359
360 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
361 file, mapping->host->i_ino, len, (long long) pos);
362
363
364
365
366
367 if (!PageUptodate(page)) {
368 unsigned pglen = nfs_page_length(page);
369 unsigned end = offset + copied;
370
371 if (pglen == 0) {
372 zero_user_segments(page, 0, offset,
373 end, PAGE_SIZE);
374 SetPageUptodate(page);
375 } else if (end >= pglen) {
376 zero_user_segment(page, end, PAGE_SIZE);
377 if (offset == 0)
378 SetPageUptodate(page);
379 } else
380 zero_user_segment(page, pglen, PAGE_SIZE);
381 }
382
383 status = nfs_updatepage(file, page, offset, copied);
384
385 unlock_page(page);
386 put_page(page);
387
388 if (status < 0)
389 return status;
390 NFS_I(mapping->host)->write_io += copied;
391
392 if (nfs_ctx_key_to_expire(ctx, mapping->host)) {
393 status = nfs_wb_all(mapping->host);
394 if (status < 0)
395 return status;
396 }
397
398 return copied;
399}
400
401
402
403
404
405
406
407
408static void nfs_invalidate_page(struct page *page, unsigned int offset,
409 unsigned int length)
410{
411 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
412 page, offset, length);
413
414 if (offset != 0 || length < PAGE_SIZE)
415 return;
416
417 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
418
419 nfs_fscache_invalidate_page(page, page->mapping->host);
420}
421
422
423
424
425
426
427
428static int nfs_release_page(struct page *page, gfp_t gfp)
429{
430 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
431
432
433 if (PagePrivate(page))
434 return 0;
435 return nfs_fscache_release_page(page, gfp);
436}
437
438static void nfs_check_dirty_writeback(struct page *page,
439 bool *dirty, bool *writeback)
440{
441 struct nfs_inode *nfsi;
442 struct address_space *mapping = page_file_mapping(page);
443
444 if (!mapping || PageSwapCache(page))
445 return;
446
447
448
449
450
451
452 nfsi = NFS_I(mapping->host);
453 if (atomic_read(&nfsi->commit_info.rpcs_out)) {
454 *writeback = true;
455 return;
456 }
457
458
459
460
461
462
463 if (PagePrivate(page))
464 *dirty = true;
465}
466
467
468
469
470
471
472
473
474
475static int nfs_launder_page(struct page *page)
476{
477 struct inode *inode = page_file_mapping(page)->host;
478 struct nfs_inode *nfsi = NFS_I(inode);
479
480 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
481 inode->i_ino, (long long)page_offset(page));
482
483 nfs_fscache_wait_on_page_write(nfsi, page);
484 return nfs_wb_page(inode, page);
485}
486
487static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
488 sector_t *span)
489{
490 unsigned long blocks;
491 long long isize;
492 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
493 struct inode *inode = file->f_mapping->host;
494
495 spin_lock(&inode->i_lock);
496 blocks = inode->i_blocks;
497 isize = inode->i_size;
498 spin_unlock(&inode->i_lock);
499 if (blocks*512 < isize) {
500 pr_warn("swap activate: swapfile has holes\n");
501 return -EINVAL;
502 }
503
504 *span = sis->pages;
505
506 return rpc_clnt_swap_activate(clnt);
507}
508
509static void nfs_swap_deactivate(struct file *file)
510{
511 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
512
513 rpc_clnt_swap_deactivate(clnt);
514}
515
516const struct address_space_operations nfs_file_aops = {
517 .readpage = nfs_readpage,
518 .readpages = nfs_readpages,
519 .set_page_dirty = __set_page_dirty_nobuffers,
520 .writepage = nfs_writepage,
521 .writepages = nfs_writepages,
522 .write_begin = nfs_write_begin,
523 .write_end = nfs_write_end,
524 .invalidatepage = nfs_invalidate_page,
525 .releasepage = nfs_release_page,
526 .direct_IO = nfs_direct_IO,
527#ifdef CONFIG_MIGRATION
528 .migratepage = nfs_migrate_page,
529#endif
530 .launder_page = nfs_launder_page,
531 .is_dirty_writeback = nfs_check_dirty_writeback,
532 .error_remove_page = generic_error_remove_page,
533 .swap_activate = nfs_swap_activate,
534 .swap_deactivate = nfs_swap_deactivate,
535};
536
537
538
539
540
541
542static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf)
543{
544 struct page *page = vmf->page;
545 struct file *filp = vmf->vma->vm_file;
546 struct inode *inode = file_inode(filp);
547 unsigned pagelen;
548 vm_fault_t ret = VM_FAULT_NOPAGE;
549 struct address_space *mapping;
550
551 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
552 filp, filp->f_mapping->host->i_ino,
553 (long long)page_offset(page));
554
555 sb_start_pagefault(inode->i_sb);
556
557
558 nfs_fscache_wait_on_page_write(NFS_I(inode), page);
559
560 wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
561 nfs_wait_bit_killable, TASK_KILLABLE);
562
563 lock_page(page);
564 mapping = page_file_mapping(page);
565 if (mapping != inode->i_mapping)
566 goto out_unlock;
567
568 wait_on_page_writeback(page);
569
570 pagelen = nfs_page_length(page);
571 if (pagelen == 0)
572 goto out_unlock;
573
574 ret = VM_FAULT_LOCKED;
575 if (nfs_flush_incompatible(filp, page) == 0 &&
576 nfs_updatepage(filp, page, 0, pagelen) == 0)
577 goto out;
578
579 ret = VM_FAULT_SIGBUS;
580out_unlock:
581 unlock_page(page);
582out:
583 sb_end_pagefault(inode->i_sb);
584 return ret;
585}
586
587static const struct vm_operations_struct nfs_file_vm_ops = {
588 .fault = filemap_fault,
589 .map_pages = filemap_map_pages,
590 .page_mkwrite = nfs_vm_page_mkwrite,
591};
592
593static int nfs_need_check_write(struct file *filp, struct inode *inode,
594 int error)
595{
596 struct nfs_open_context *ctx;
597
598 ctx = nfs_file_open_context(filp);
599 if (nfs_error_is_fatal_on_server(error) ||
600 nfs_ctx_key_to_expire(ctx, inode))
601 return 1;
602 return 0;
603}
604
605ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
606{
607 struct file *file = iocb->ki_filp;
608 struct inode *inode = file_inode(file);
609 unsigned int mntflags = NFS_SERVER(inode)->flags;
610 ssize_t result, written;
611 errseq_t since;
612 int error;
613
614 result = nfs_key_timeout_notify(file, inode);
615 if (result)
616 return result;
617
618 if (iocb->ki_flags & IOCB_DIRECT)
619 return nfs_file_direct_write(iocb, from);
620
621 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
622 file, iov_iter_count(from), (long long) iocb->ki_pos);
623
624 if (IS_SWAPFILE(inode))
625 goto out_swapfile;
626
627
628
629 if (iocb->ki_flags & IOCB_APPEND || iocb->ki_pos > i_size_read(inode)) {
630 result = nfs_revalidate_file_size(inode, file);
631 if (result)
632 goto out;
633 }
634
635 nfs_clear_invalid_mapping(file->f_mapping);
636
637 since = filemap_sample_wb_err(file->f_mapping);
638 nfs_start_io_write(inode);
639 result = generic_write_checks(iocb, from);
640 if (result > 0) {
641 current->backing_dev_info = inode_to_bdi(inode);
642 result = generic_perform_write(file, from, iocb->ki_pos);
643 current->backing_dev_info = NULL;
644 }
645 nfs_end_io_write(inode);
646 if (result <= 0)
647 goto out;
648
649 written = result;
650 iocb->ki_pos += written;
651
652 if (mntflags & NFS_MOUNT_WRITE_EAGER) {
653 result = filemap_fdatawrite_range(file->f_mapping,
654 iocb->ki_pos - written,
655 iocb->ki_pos - 1);
656 if (result < 0)
657 goto out;
658 }
659 if (mntflags & NFS_MOUNT_WRITE_WAIT) {
660 result = filemap_fdatawait_range(file->f_mapping,
661 iocb->ki_pos - written,
662 iocb->ki_pos - 1);
663 if (result < 0)
664 goto out;
665 }
666 result = generic_write_sync(iocb, written);
667 if (result < 0)
668 goto out;
669
670
671 error = filemap_check_wb_err(file->f_mapping, since);
672 if (nfs_need_check_write(file, inode, error)) {
673 int err = nfs_wb_all(inode);
674 if (err < 0)
675 result = err;
676 }
677 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
678out:
679 return result;
680
681out_swapfile:
682 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
683 return -ETXTBSY;
684}
685EXPORT_SYMBOL_GPL(nfs_file_write);
686
687static int
688do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
689{
690 struct inode *inode = filp->f_mapping->host;
691 int status = 0;
692 unsigned int saved_type = fl->fl_type;
693
694
695 posix_test_lock(filp, fl);
696 if (fl->fl_type != F_UNLCK) {
697
698 goto out;
699 }
700 fl->fl_type = saved_type;
701
702 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
703 goto out_noconflict;
704
705 if (is_local)
706 goto out_noconflict;
707
708 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
709out:
710 return status;
711out_noconflict:
712 fl->fl_type = F_UNLCK;
713 goto out;
714}
715
716static int
717do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
718{
719 struct inode *inode = filp->f_mapping->host;
720 struct nfs_lock_context *l_ctx;
721 int status;
722
723
724
725
726
727 nfs_wb_all(inode);
728
729 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
730 if (!IS_ERR(l_ctx)) {
731 status = nfs_iocounter_wait(l_ctx);
732 nfs_put_lock_context(l_ctx);
733
734
735
736
737 if (status < 0 && !(fl->fl_flags & FL_CLOSE))
738 return status;
739 }
740
741
742
743
744
745 if (!is_local)
746 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
747 else
748 status = locks_lock_file_wait(filp, fl);
749 return status;
750}
751
752static int
753do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
754{
755 struct inode *inode = filp->f_mapping->host;
756 int status;
757
758
759
760
761
762 status = nfs_sync_mapping(filp->f_mapping);
763 if (status != 0)
764 goto out;
765
766
767
768
769
770 if (!is_local)
771 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
772 else
773 status = locks_lock_file_wait(filp, fl);
774 if (status < 0)
775 goto out;
776
777
778
779
780
781
782
783
784 nfs_sync_mapping(filp->f_mapping);
785 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
786 nfs_zap_caches(inode);
787 if (mapping_mapped(filp->f_mapping))
788 nfs_revalidate_mapping(inode, filp->f_mapping);
789 }
790out:
791 return status;
792}
793
794
795
796
797int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
798{
799 struct inode *inode = filp->f_mapping->host;
800 int ret = -ENOLCK;
801 int is_local = 0;
802
803 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
804 filp, fl->fl_type, fl->fl_flags,
805 (long long)fl->fl_start, (long long)fl->fl_end);
806
807 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
808
809 if (fl->fl_flags & FL_RECLAIM)
810 return -ENOGRACE;
811
812 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
813 is_local = 1;
814
815 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
816 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
817 if (ret < 0)
818 goto out_err;
819 }
820
821 if (IS_GETLK(cmd))
822 ret = do_getlk(filp, cmd, fl, is_local);
823 else if (fl->fl_type == F_UNLCK)
824 ret = do_unlk(filp, cmd, fl, is_local);
825 else
826 ret = do_setlk(filp, cmd, fl, is_local);
827out_err:
828 return ret;
829}
830EXPORT_SYMBOL_GPL(nfs_lock);
831
832
833
834
835int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
836{
837 struct inode *inode = filp->f_mapping->host;
838 int is_local = 0;
839
840 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
841 filp, fl->fl_type, fl->fl_flags);
842
843 if (!(fl->fl_flags & FL_FLOCK))
844 return -ENOLCK;
845
846
847
848
849
850
851
852 if (fl->fl_type & LOCK_MAND)
853 return -EINVAL;
854
855 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
856 is_local = 1;
857
858
859 if (fl->fl_type == F_UNLCK)
860 return do_unlk(filp, cmd, fl, is_local);
861 return do_setlk(filp, cmd, fl, is_local);
862}
863EXPORT_SYMBOL_GPL(nfs_flock);
864
865const struct file_operations nfs_file_operations = {
866 .llseek = nfs_file_llseek,
867 .read_iter = nfs_file_read,
868 .write_iter = nfs_file_write,
869 .mmap = nfs_file_mmap,
870 .open = nfs_file_open,
871 .flush = nfs_file_flush,
872 .release = nfs_file_release,
873 .fsync = nfs_file_fsync,
874 .lock = nfs_lock,
875 .flock = nfs_flock,
876 .splice_read = generic_file_splice_read,
877 .splice_write = iter_file_splice_write,
878 .check_flags = nfs_check_flags,
879 .setlease = simple_nosetlease,
880};
881EXPORT_SYMBOL_GPL(nfs_file_operations);
882