4 * Copyright (C) 1992 Rick Sladkey
6 * Changes Copyright (C) 1994 by Florian La Roche
7 * - Do not copy data too often around in the kernel.
8 * - In nfs_file_read the return value of kmalloc wasn't checked.
9 * - Put in a better version of read look-ahead buffering. Original idea
10 * and implementation by Wai S Kok elekokws@ee.nus.sg.
12 * Expire cache on write to a file by Wai S Kok (Oct 1994).
14 * Total rewrite of read side for new NFS buffer cache.. Linus.
16 * nfs regular file handling functions
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>
28 #include <linux/pagemap.h>
29 #include <linux/aio.h>
30 #include <linux/gfp.h>
31 #include <linux/swap.h>
33 #include <asm/uaccess.h>
35 #include "delegation.h"
43 #define NFSDBG_FACILITY NFSDBG_FILE
45 static const struct vm_operations_struct nfs_file_vm_ops
;
47 /* Hack for future NFS swap support */
49 # define IS_SWAPFILE(inode) (0)
52 int nfs_check_flags(int flags
)
54 if ((flags
& (O_APPEND
| O_DIRECT
)) == (O_APPEND
| O_DIRECT
))
59 EXPORT_SYMBOL_GPL(nfs_check_flags
);
65 nfs_file_open(struct inode
*inode
, struct file
*filp
)
69 dprintk("NFS: open file(%pD2)\n", filp
);
71 nfs_inc_stats(inode
, NFSIOS_VFSOPEN
);
72 res
= nfs_check_flags(filp
->f_flags
);
76 res
= nfs_open(inode
, filp
);
81 nfs_file_release(struct inode
*inode
, struct file
*filp
)
83 dprintk("NFS: release(%pD2)\n", filp
);
85 nfs_inc_stats(inode
, NFSIOS_VFSRELEASE
);
86 return nfs_release(inode
, filp
);
88 EXPORT_SYMBOL_GPL(nfs_file_release
);
91 * nfs_revalidate_size - Revalidate the file size
92 * @inode - pointer to inode struct
93 * @file - pointer to struct file
95 * Revalidates the file length. This is basically a wrapper around
96 * nfs_revalidate_inode() that takes into account the fact that we may
97 * have cached writes (in which case we don't care about the server's
98 * idea of what the file length is), or O_DIRECT (in which case we
99 * shouldn't trust the cache).
101 static int nfs_revalidate_file_size(struct inode
*inode
, struct file
*filp
)
103 struct nfs_server
*server
= NFS_SERVER(inode
);
104 struct nfs_inode
*nfsi
= NFS_I(inode
);
106 if (nfs_have_delegated_attributes(inode
))
109 if (filp
->f_flags
& O_DIRECT
)
111 if (nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
113 if (nfs_attribute_timeout(inode
))
118 return __nfs_revalidate_inode(server
, inode
);
121 loff_t
nfs_file_llseek(struct file
*filp
, loff_t offset
, int whence
)
123 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
124 filp
, offset
, whence
);
127 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
128 * the cached file length
130 if (whence
!= SEEK_SET
&& whence
!= SEEK_CUR
) {
131 struct inode
*inode
= filp
->f_mapping
->host
;
133 int retval
= nfs_revalidate_file_size(inode
, filp
);
135 return (loff_t
)retval
;
138 return generic_file_llseek(filp
, offset
, whence
);
140 EXPORT_SYMBOL_GPL(nfs_file_llseek
);
143 * Flush all dirty pages, and check for write errors.
146 nfs_file_flush(struct file
*file
, fl_owner_t id
)
148 struct inode
*inode
= file_inode(file
);
150 dprintk("NFS: flush(%pD2)\n", file
);
152 nfs_inc_stats(inode
, NFSIOS_VFSFLUSH
);
153 if ((file
->f_mode
& FMODE_WRITE
) == 0)
157 * If we're holding a write delegation, then just start the i/o
158 * but don't wait for completion (or send a commit).
160 if (NFS_PROTO(inode
)->have_delegation(inode
, FMODE_WRITE
))
161 return filemap_fdatawrite(file
->f_mapping
);
163 /* Flush writes to the server and return any errors */
164 return vfs_fsync(file
, 0);
166 EXPORT_SYMBOL_GPL(nfs_file_flush
);
169 nfs_file_read(struct kiocb
*iocb
, struct iov_iter
*to
)
171 struct inode
*inode
= file_inode(iocb
->ki_filp
);
174 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
175 return nfs_file_direct_read(iocb
, to
, iocb
->ki_pos
);
177 dprintk("NFS: read(%pD2, %zu@%lu)\n",
179 iov_iter_count(to
), (unsigned long) iocb
->ki_pos
);
181 result
= nfs_revalidate_mapping(inode
, iocb
->ki_filp
->f_mapping
);
183 result
= generic_file_read_iter(iocb
, to
);
185 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, result
);
189 EXPORT_SYMBOL_GPL(nfs_file_read
);
192 nfs_file_splice_read(struct file
*filp
, loff_t
*ppos
,
193 struct pipe_inode_info
*pipe
, size_t count
,
196 struct inode
*inode
= file_inode(filp
);
199 dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n",
200 filp
, (unsigned long) count
, (unsigned long long) *ppos
);
202 res
= nfs_revalidate_mapping(inode
, filp
->f_mapping
);
204 res
= generic_file_splice_read(filp
, ppos
, pipe
, count
, flags
);
206 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, res
);
210 EXPORT_SYMBOL_GPL(nfs_file_splice_read
);
213 nfs_file_mmap(struct file
* file
, struct vm_area_struct
* vma
)
215 struct inode
*inode
= file_inode(file
);
218 dprintk("NFS: mmap(%pD2)\n", file
);
220 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
221 * so we call that before revalidating the mapping
223 status
= generic_file_mmap(file
, vma
);
225 vma
->vm_ops
= &nfs_file_vm_ops
;
226 status
= nfs_revalidate_mapping(inode
, file
->f_mapping
);
230 EXPORT_SYMBOL_GPL(nfs_file_mmap
);
233 * Flush any dirty pages for this process, and check for write errors.
234 * The return status from this call provides a reliable indication of
235 * whether any write errors occurred for this process.
237 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
238 * disk, but it retrieves and clears ctx->error after synching, despite
239 * the two being set at the same time in nfs_context_set_write_error().
240 * This is because the former is used to notify the _next_ call to
241 * nfs_file_write() that a write error occurred, and hence cause it to
242 * fall back to doing a synchronous write.
245 nfs_file_fsync_commit(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
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
;
252 dprintk("NFS: fsync file(%pD2) datasync %d\n", file
, datasync
);
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
);
260 ret
= xchg(&ctx
->error
, 0);
268 do_resend
|= test_bit(NFS_CONTEXT_RESEND_WRITES
, &ctx
->flags
);
274 EXPORT_SYMBOL_GPL(nfs_file_fsync_commit
);
277 nfs_file_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
280 struct inode
*inode
= file_inode(file
);
282 trace_nfs_fsync_enter(inode
);
285 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
288 mutex_lock(&inode
->i_mutex
);
289 ret
= nfs_file_fsync_commit(file
, start
, end
, datasync
);
290 mutex_unlock(&inode
->i_mutex
);
292 * If nfs_file_fsync_commit detected a server reboot, then
293 * resend all dirty pages that might have been covered by
294 * the NFS_CONTEXT_RESEND_WRITES flag
298 } while (ret
== -EAGAIN
);
300 trace_nfs_fsync_exit(inode
, ret
);
305 * Decide whether a read/modify/write cycle may be more efficient
306 * then a modify/write/read cycle when writing to a page in the
309 * The modify/write/read cycle may occur if a page is read before
310 * being completely filled by the writer. In this situation, the
311 * page must be completely written to stable storage on the server
312 * before it can be refilled by reading in the page from the server.
313 * This can lead to expensive, small, FILE_SYNC mode writes being
316 * It may be more efficient to read the page first if the file is
317 * open for reading in addition to writing, the page is not marked
318 * as Uptodate, it is not dirty or waiting to be committed,
319 * indicating that it was previously allocated and then modified,
320 * that there were valid bytes of data in that range of the file,
321 * and that the new data won't completely replace the old data in
322 * that range of the file.
324 static int nfs_want_read_modify_write(struct file
*file
, struct page
*page
,
325 loff_t pos
, unsigned len
)
327 unsigned int pglen
= nfs_page_length(page
);
328 unsigned int offset
= pos
& (PAGE_CACHE_SIZE
- 1);
329 unsigned int end
= offset
+ len
;
331 if (pnfs_ld_read_whole_page(file
->f_mapping
->host
)) {
332 if (!PageUptodate(page
))
337 if ((file
->f_mode
& FMODE_READ
) && /* open for read? */
338 !PageUptodate(page
) && /* Uptodate? */
339 !PagePrivate(page
) && /* i/o request already? */
340 pglen
&& /* valid bytes of file? */
341 (end
< pglen
|| offset
)) /* replace all valid bytes? */
347 * This does the "real" work of the write. We must allocate and lock the
348 * page to be sent back to the generic routine, which then copies the
349 * data from user space.
351 * If the writer ends up delaying the write, the writer needs to
352 * increment the page use counts until he is done with the page.
354 static 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
)
359 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
363 dfprintk(PAGECACHE
, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
364 file
, mapping
->host
->i_ino
, len
, (long long) pos
);
368 * Prevent starvation issues if someone is doing a consistency
371 ret
= wait_on_bit_action(&NFS_I(mapping
->host
)->flags
, NFS_INO_FLUSHING
,
372 nfs_wait_bit_killable
, TASK_KILLABLE
);
376 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
381 ret
= nfs_flush_incompatible(file
, page
);
384 page_cache_release(page
);
385 } else if (!once_thru
&&
386 nfs_want_read_modify_write(file
, page
, pos
, len
)) {
388 ret
= nfs_readpage(file
, page
);
389 page_cache_release(page
);
396 static 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
)
400 unsigned offset
= pos
& (PAGE_CACHE_SIZE
- 1);
401 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
404 dfprintk(PAGECACHE
, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
405 file
, mapping
->host
->i_ino
, len
, (long long) pos
);
408 * Zero any uninitialised parts of the page, and then mark the page
409 * as up to date if it turns out that we're extending the file.
411 if (!PageUptodate(page
)) {
412 unsigned pglen
= nfs_page_length(page
);
413 unsigned end
= offset
+ len
;
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
);
422 SetPageUptodate(page
);
424 zero_user_segment(page
, pglen
, PAGE_CACHE_SIZE
);
427 status
= nfs_updatepage(file
, page
, offset
, copied
);
430 page_cache_release(page
);
434 NFS_I(mapping
->host
)->write_io
+= copied
;
436 if (nfs_ctx_key_to_expire(ctx
)) {
437 status
= nfs_wb_all(mapping
->host
);
446 * Partially or wholly invalidate a page
447 * - Release the private state associated with a page if undergoing complete
449 * - Called if either PG_private or PG_fscache is set on the page
450 * - Caller holds page lock
452 static void nfs_invalidate_page(struct page
*page
, unsigned int offset
,
455 dfprintk(PAGECACHE
, "NFS: invalidate_page(%p, %u, %u)\n",
456 page
, offset
, length
);
458 if (offset
!= 0 || length
< PAGE_CACHE_SIZE
)
460 /* Cancel any unstarted writes on this page */
461 nfs_wb_page_cancel(page_file_mapping(page
)->host
, page
);
463 nfs_fscache_invalidate_page(page
, page
->mapping
->host
);
467 * Attempt to release the private state associated with a page
468 * - Called if either PG_private or PG_fscache is set on the page
469 * - Caller holds page lock
470 * - Return true (may release page) or false (may not)
472 static int nfs_release_page(struct page
*page
, gfp_t gfp
)
474 struct address_space
*mapping
= page
->mapping
;
476 dfprintk(PAGECACHE
, "NFS: release_page(%p)\n", page
);
478 /* Always try to initiate a 'commit' if relevant, but only
479 * wait for it if __GFP_WAIT is set. Even then, only wait 1
480 * second and only if the 'bdi' is not congested.
481 * Waiting indefinitely can cause deadlocks when the NFS
482 * server is on this machine, when a new TCP connection is
483 * needed and in other rare cases. There is no particular
484 * need to wait extensively here. A short wait has the
485 * benefit that someone else can worry about the freezer.
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
,
494 if (PagePrivate(page
))
495 set_bdi_congested(&nfss
->backing_dev_info
,
499 /* If PagePrivate() is set, then the page is not freeable */
500 if (PagePrivate(page
))
502 return nfs_fscache_release_page(page
, gfp
);
505 static void nfs_check_dirty_writeback(struct page
*page
,
506 bool *dirty
, bool *writeback
)
508 struct nfs_inode
*nfsi
;
509 struct address_space
*mapping
= page_file_mapping(page
);
511 if (!mapping
|| PageSwapCache(page
))
515 * Check if an unstable page is currently being committed and
516 * if so, have the VM treat it as if the page is under writeback
517 * so it will not block due to pages that will shortly be freeable.
519 nfsi
= NFS_I(mapping
->host
);
520 if (test_bit(NFS_INO_COMMIT
, &nfsi
->flags
)) {
526 * If PagePrivate() is set, then the page is not freeable and as the
527 * inode is not being committed, it's not going to be cleaned in the
528 * near future so treat it as dirty
530 if (PagePrivate(page
))
535 * Attempt to clear the private state associated with a page when an error
536 * occurs that requires the cached contents of an inode to be written back or
538 * - Called if either PG_private or fscache is set on the page
539 * - Caller holds page lock
540 * - Return 0 if successful, -error otherwise
542 static int nfs_launder_page(struct page
*page
)
544 struct inode
*inode
= page_file_mapping(page
)->host
;
545 struct nfs_inode
*nfsi
= NFS_I(inode
);
547 dfprintk(PAGECACHE
, "NFS: launder_page(%ld, %llu)\n",
548 inode
->i_ino
, (long long)page_offset(page
));
550 nfs_fscache_wait_on_page_write(nfsi
, page
);
551 return nfs_wb_page(inode
, page
);
554 #ifdef CONFIG_NFS_SWAP
555 static int nfs_swap_activate(struct swap_info_struct
*sis
, struct file
*file
,
559 struct rpc_clnt
*clnt
= NFS_CLIENT(file
->f_mapping
->host
);
564 ret
= xs_swapper(rcu_dereference(clnt
->cl_xprt
), 1);
570 static void nfs_swap_deactivate(struct file
*file
)
572 struct rpc_clnt
*clnt
= NFS_CLIENT(file
->f_mapping
->host
);
575 xs_swapper(rcu_dereference(clnt
->cl_xprt
), 0);
580 const 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
,
602 * Notification that a PTE pointing to an NFS page is about to be made
603 * writable, implying that someone is about to modify the page through a
604 * shared-writable mapping
606 static int nfs_vm_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
608 struct page
*page
= vmf
->page
;
609 struct file
*filp
= vma
->vm_file
;
610 struct inode
*inode
= file_inode(filp
);
612 int ret
= VM_FAULT_NOPAGE
;
613 struct address_space
*mapping
;
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
));
619 /* make sure the cache has finished storing the page */
620 nfs_fscache_wait_on_page_write(NFS_I(inode
), page
);
623 mapping
= page_file_mapping(page
);
624 if (mapping
!= inode
->i_mapping
)
627 wait_on_page_writeback(page
);
629 pagelen
= nfs_page_length(page
);
633 ret
= VM_FAULT_LOCKED
;
634 if (nfs_flush_incompatible(filp
, page
) == 0 &&
635 nfs_updatepage(filp
, page
, 0, pagelen
) == 0)
638 ret
= VM_FAULT_SIGBUS
;
645 static 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
,
652 static int nfs_need_sync_write(struct file
*filp
, struct inode
*inode
)
654 struct nfs_open_context
*ctx
;
656 if (IS_SYNC(inode
) || (filp
->f_flags
& O_DSYNC
))
658 ctx
= nfs_file_open_context(filp
);
659 if (test_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
) ||
660 nfs_ctx_key_to_expire(ctx
))
665 ssize_t
nfs_file_write(struct kiocb
*iocb
, struct iov_iter
*from
)
667 struct file
*file
= iocb
->ki_filp
;
668 struct inode
*inode
= file_inode(file
);
669 unsigned long written
= 0;
671 size_t count
= iov_iter_count(from
);
672 loff_t pos
= iocb
->ki_pos
;
674 result
= nfs_key_timeout_notify(file
, inode
);
678 if (file
->f_flags
& O_DIRECT
)
679 return nfs_file_direct_write(iocb
, from
, pos
);
681 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
682 file
, count
, (long long) pos
);
685 if (IS_SWAPFILE(inode
))
688 * O_APPEND implies that we must revalidate the file length.
690 if (file
->f_flags
& O_APPEND
) {
691 result
= nfs_revalidate_file_size(inode
, file
);
700 result
= generic_file_write_iter(iocb
, from
);
704 /* Return error values for O_DSYNC and IS_SYNC() */
705 if (result
>= 0 && nfs_need_sync_write(file
, inode
)) {
706 int err
= vfs_fsync(file
, 0);
711 nfs_add_stats(inode
, NFSIOS_NORMALWRITTENBYTES
, written
);
716 printk(KERN_INFO
"NFS: attempt to write to active swap file!\n");
719 EXPORT_SYMBOL_GPL(nfs_file_write
);
722 do_getlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
724 struct inode
*inode
= filp
->f_mapping
->host
;
726 unsigned int saved_type
= fl
->fl_type
;
728 /* Try local locking first */
729 posix_test_lock(filp
, fl
);
730 if (fl
->fl_type
!= F_UNLCK
) {
731 /* found a conflict */
734 fl
->fl_type
= saved_type
;
736 if (NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
))
742 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
746 fl
->fl_type
= F_UNLCK
;
750 static int do_vfs_lock(struct file
*file
, struct file_lock
*fl
)
753 switch (fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)) {
755 res
= posix_lock_file_wait(file
, fl
);
758 res
= flock_lock_file_wait(file
, fl
);
767 do_unlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
769 struct inode
*inode
= filp
->f_mapping
->host
;
770 struct nfs_lock_context
*l_ctx
;
774 * Flush all pending writes before doing anything
777 nfs_sync_mapping(filp
->f_mapping
);
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
);
787 /* NOTE: special case
788 * If we're signalled while cleaning up locks on process exit, we
789 * still need to complete the unlock.
792 * Use local locking if mounted with "-onolock" or with appropriate
796 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
798 status
= do_vfs_lock(filp
, fl
);
803 is_time_granular(struct timespec
*ts
) {
804 return ((ts
->tv_sec
== 0) && (ts
->tv_nsec
<= 1000));
808 do_setlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
810 struct inode
*inode
= filp
->f_mapping
->host
;
814 * Flush all pending writes before doing anything
817 status
= nfs_sync_mapping(filp
->f_mapping
);
822 * Use local locking if mounted with "-onolock" or with appropriate
826 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
828 status
= do_vfs_lock(filp
, fl
);
833 * Revalidate the cache if the server has time stamps granular
834 * enough to detect subsecond changes. Otherwise, clear the
835 * cache to prevent missing any changes.
837 * This makes locking act as a cache coherency point.
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
);
844 nfs_zap_caches(inode
);
851 * Lock a (portion of) a file
853 int nfs_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
855 struct inode
*inode
= filp
->f_mapping
->host
;
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
);
863 nfs_inc_stats(inode
, NFSIOS_VFSLOCK
);
865 /* No mandatory locks over NFS */
866 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
869 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FCNTL
)
872 if (NFS_PROTO(inode
)->lock_check_bounds
!= NULL
) {
873 ret
= NFS_PROTO(inode
)->lock_check_bounds(fl
);
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
);
883 ret
= do_setlk(filp
, cmd
, fl
, is_local
);
887 EXPORT_SYMBOL_GPL(nfs_lock
);
890 * Lock a (portion of) a file
892 int nfs_flock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
894 struct inode
*inode
= filp
->f_mapping
->host
;
897 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
898 filp
, fl
->fl_type
, fl
->fl_flags
);
900 if (!(fl
->fl_flags
& FL_FLOCK
))
904 * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
905 * any standard. In principle we might be able to support LOCK_MAND
906 * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
907 * NFS code is not set up for it.
909 if (fl
->fl_type
& LOCK_MAND
)
912 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FLOCK
)
915 /* We're simulating flock() locks using posix locks on the server */
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
);
920 EXPORT_SYMBOL_GPL(nfs_flock
);
922 const 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
,
935 .splice_read
= nfs_file_splice_read
,
936 .splice_write
= iter_file_splice_write
,
937 .check_flags
= nfs_check_flags
,
938 .setlease
= simple_nosetlease
,
940 EXPORT_SYMBOL_GPL(nfs_file_operations
);