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"
40 #define NFSDBG_FACILITY NFSDBG_FILE
42 static const struct vm_operations_struct nfs_file_vm_ops
;
44 /* Hack for future NFS swap support */
46 # define IS_SWAPFILE(inode) (0)
49 int nfs_check_flags(int flags
)
51 if ((flags
& (O_APPEND
| O_DIRECT
)) == (O_APPEND
| O_DIRECT
))
61 nfs_file_open(struct inode
*inode
, struct file
*filp
)
65 dprintk("NFS: open file(%s/%s)\n",
66 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
67 filp
->f_path
.dentry
->d_name
.name
);
69 nfs_inc_stats(inode
, NFSIOS_VFSOPEN
);
70 res
= nfs_check_flags(filp
->f_flags
);
74 res
= nfs_open(inode
, filp
);
79 nfs_file_release(struct inode
*inode
, struct file
*filp
)
81 dprintk("NFS: release(%s/%s)\n",
82 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
83 filp
->f_path
.dentry
->d_name
.name
);
85 nfs_inc_stats(inode
, NFSIOS_VFSRELEASE
);
86 return nfs_release(inode
, filp
);
90 * nfs_revalidate_size - Revalidate the file size
91 * @inode - pointer to inode struct
92 * @file - pointer to struct file
94 * Revalidates the file length. This is basically a wrapper around
95 * nfs_revalidate_inode() that takes into account the fact that we may
96 * have cached writes (in which case we don't care about the server's
97 * idea of what the file length is), or O_DIRECT (in which case we
98 * shouldn't trust the cache).
100 static int nfs_revalidate_file_size(struct inode
*inode
, struct file
*filp
)
102 struct nfs_server
*server
= NFS_SERVER(inode
);
103 struct nfs_inode
*nfsi
= NFS_I(inode
);
105 if (nfs_have_delegated_attributes(inode
))
108 if (filp
->f_flags
& O_DIRECT
)
110 if (nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
112 if (nfs_attribute_timeout(inode
))
117 return __nfs_revalidate_inode(server
, inode
);
120 loff_t
nfs_file_llseek(struct file
*filp
, loff_t offset
, int origin
)
122 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
123 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
124 filp
->f_path
.dentry
->d_name
.name
,
128 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
129 * the cached file length
131 if (origin
!= SEEK_SET
&& origin
!= SEEK_CUR
) {
132 struct inode
*inode
= filp
->f_mapping
->host
;
134 int retval
= nfs_revalidate_file_size(inode
, filp
);
136 return (loff_t
)retval
;
139 return generic_file_llseek(filp
, offset
, origin
);
143 * Flush all dirty pages, and check for write errors.
146 nfs_file_flush(struct file
*file
, fl_owner_t id
)
148 struct dentry
*dentry
= file
->f_path
.dentry
;
149 struct inode
*inode
= dentry
->d_inode
;
151 dprintk("NFS: flush(%s/%s)\n",
152 dentry
->d_parent
->d_name
.name
,
153 dentry
->d_name
.name
);
155 nfs_inc_stats(inode
, NFSIOS_VFSFLUSH
);
156 if ((file
->f_mode
& FMODE_WRITE
) == 0)
160 * If we're holding a write delegation, then just start the i/o
161 * but don't wait for completion (or send a commit).
163 if (NFS_PROTO(inode
)->have_delegation(inode
, FMODE_WRITE
))
164 return filemap_fdatawrite(file
->f_mapping
);
166 /* Flush writes to the server and return any errors */
167 return vfs_fsync(file
, 0);
171 nfs_file_read(struct kiocb
*iocb
, const struct iovec
*iov
,
172 unsigned long nr_segs
, loff_t pos
)
174 struct dentry
* dentry
= iocb
->ki_filp
->f_path
.dentry
;
175 struct inode
* inode
= dentry
->d_inode
;
178 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
179 return nfs_file_direct_read(iocb
, iov
, nr_segs
, pos
);
181 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
182 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
183 (unsigned long) iov_length(iov
, nr_segs
), (unsigned long) pos
);
185 result
= nfs_revalidate_mapping(inode
, iocb
->ki_filp
->f_mapping
);
187 result
= generic_file_aio_read(iocb
, iov
, nr_segs
, pos
);
189 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, result
);
195 nfs_file_splice_read(struct file
*filp
, loff_t
*ppos
,
196 struct pipe_inode_info
*pipe
, size_t count
,
199 struct dentry
*dentry
= filp
->f_path
.dentry
;
200 struct inode
*inode
= dentry
->d_inode
;
203 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
204 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
205 (unsigned long) count
, (unsigned long long) *ppos
);
207 res
= nfs_revalidate_mapping(inode
, filp
->f_mapping
);
209 res
= generic_file_splice_read(filp
, ppos
, pipe
, count
, flags
);
211 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, res
);
217 nfs_file_mmap(struct file
* file
, struct vm_area_struct
* vma
)
219 struct dentry
*dentry
= file
->f_path
.dentry
;
220 struct inode
*inode
= dentry
->d_inode
;
223 dprintk("NFS: mmap(%s/%s)\n",
224 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
226 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
227 * so we call that before revalidating the mapping
229 status
= generic_file_mmap(file
, vma
);
231 vma
->vm_ops
= &nfs_file_vm_ops
;
232 status
= nfs_revalidate_mapping(inode
, file
->f_mapping
);
238 * Flush any dirty pages for this process, and check for write errors.
239 * The return status from this call provides a reliable indication of
240 * whether any write errors occurred for this process.
242 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
243 * disk, but it retrieves and clears ctx->error after synching, despite
244 * the two being set at the same time in nfs_context_set_write_error().
245 * This is because the former is used to notify the _next_ call to
246 * nfs_file_write() that a write error occurred, and hence cause it to
247 * fall back to doing a synchronous write.
250 nfs_file_fsync_commit(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
252 struct dentry
*dentry
= file
->f_path
.dentry
;
253 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
254 struct inode
*inode
= dentry
->d_inode
;
255 int have_error
, status
;
258 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
259 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
262 nfs_inc_stats(inode
, NFSIOS_VFSFSYNC
);
263 have_error
= test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
264 status
= nfs_commit_inode(inode
, FLUSH_SYNC
);
265 if (status
>= 0 && ret
< 0)
267 have_error
|= test_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
269 ret
= xchg(&ctx
->error
, 0);
270 if (!ret
&& status
< 0)
276 nfs_file_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
279 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
281 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
282 mutex_lock(&inode
->i_mutex
);
283 ret
= nfs_file_fsync_commit(file
, start
, end
, datasync
);
284 mutex_unlock(&inode
->i_mutex
);
290 * Decide whether a read/modify/write cycle may be more efficient
291 * then a modify/write/read cycle when writing to a page in the
294 * The modify/write/read cycle may occur if a page is read before
295 * being completely filled by the writer. In this situation, the
296 * page must be completely written to stable storage on the server
297 * before it can be refilled by reading in the page from the server.
298 * This can lead to expensive, small, FILE_SYNC mode writes being
301 * It may be more efficient to read the page first if the file is
302 * open for reading in addition to writing, the page is not marked
303 * as Uptodate, it is not dirty or waiting to be committed,
304 * indicating that it was previously allocated and then modified,
305 * that there were valid bytes of data in that range of the file,
306 * and that the new data won't completely replace the old data in
307 * that range of the file.
309 static int nfs_want_read_modify_write(struct file
*file
, struct page
*page
,
310 loff_t pos
, unsigned len
)
312 unsigned int pglen
= nfs_page_length(page
);
313 unsigned int offset
= pos
& (PAGE_CACHE_SIZE
- 1);
314 unsigned int end
= offset
+ len
;
316 if ((file
->f_mode
& FMODE_READ
) && /* open for read? */
317 !PageUptodate(page
) && /* Uptodate? */
318 !PagePrivate(page
) && /* i/o request already? */
319 pglen
&& /* valid bytes of file? */
320 (end
< pglen
|| offset
)) /* replace all valid bytes? */
326 * This does the "real" work of the write. We must allocate and lock the
327 * page to be sent back to the generic routine, which then copies the
328 * data from user space.
330 * If the writer ends up delaying the write, the writer needs to
331 * increment the page use counts until he is done with the page.
333 static int nfs_write_begin(struct file
*file
, struct address_space
*mapping
,
334 loff_t pos
, unsigned len
, unsigned flags
,
335 struct page
**pagep
, void **fsdata
)
338 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
342 dfprintk(PAGECACHE
, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
343 file
->f_path
.dentry
->d_parent
->d_name
.name
,
344 file
->f_path
.dentry
->d_name
.name
,
345 mapping
->host
->i_ino
, len
, (long long) pos
);
349 * Prevent starvation issues if someone is doing a consistency
352 ret
= wait_on_bit(&NFS_I(mapping
->host
)->flags
, NFS_INO_FLUSHING
,
353 nfs_wait_bit_killable
, TASK_KILLABLE
);
357 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
362 ret
= nfs_flush_incompatible(file
, page
);
365 page_cache_release(page
);
366 } else if (!once_thru
&&
367 nfs_want_read_modify_write(file
, page
, pos
, len
)) {
369 ret
= nfs_readpage(file
, page
);
370 page_cache_release(page
);
377 static int nfs_write_end(struct file
*file
, struct address_space
*mapping
,
378 loff_t pos
, unsigned len
, unsigned copied
,
379 struct page
*page
, void *fsdata
)
381 unsigned offset
= pos
& (PAGE_CACHE_SIZE
- 1);
384 dfprintk(PAGECACHE
, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
385 file
->f_path
.dentry
->d_parent
->d_name
.name
,
386 file
->f_path
.dentry
->d_name
.name
,
387 mapping
->host
->i_ino
, len
, (long long) pos
);
390 * Zero any uninitialised parts of the page, and then mark the page
391 * as up to date if it turns out that we're extending the file.
393 if (!PageUptodate(page
)) {
394 unsigned pglen
= nfs_page_length(page
);
395 unsigned end
= offset
+ len
;
398 zero_user_segments(page
, 0, offset
,
399 end
, PAGE_CACHE_SIZE
);
400 SetPageUptodate(page
);
401 } else if (end
>= pglen
) {
402 zero_user_segment(page
, end
, PAGE_CACHE_SIZE
);
404 SetPageUptodate(page
);
406 zero_user_segment(page
, pglen
, PAGE_CACHE_SIZE
);
409 status
= nfs_updatepage(file
, page
, offset
, copied
);
412 page_cache_release(page
);
416 NFS_I(mapping
->host
)->write_io
+= copied
;
421 * Partially or wholly invalidate a page
422 * - Release the private state associated with a page if undergoing complete
424 * - Called if either PG_private or PG_fscache is set on the page
425 * - Caller holds page lock
427 static void nfs_invalidate_page(struct page
*page
, unsigned long offset
)
429 dfprintk(PAGECACHE
, "NFS: invalidate_page(%p, %lu)\n", page
, offset
);
433 /* Cancel any unstarted writes on this page */
434 nfs_wb_page_cancel(page
->mapping
->host
, page
);
436 nfs_fscache_invalidate_page(page
, page
->mapping
->host
);
440 * Attempt to release the private state associated with a page
441 * - Called if either PG_private or PG_fscache is set on the page
442 * - Caller holds page lock
443 * - Return true (may release page) or false (may not)
445 static int nfs_release_page(struct page
*page
, gfp_t gfp
)
447 struct address_space
*mapping
= page
->mapping
;
449 dfprintk(PAGECACHE
, "NFS: release_page(%p)\n", page
);
451 /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not
452 * doing this memory reclaim for a fs-related allocation.
454 if (mapping
&& (gfp
& GFP_KERNEL
) == GFP_KERNEL
&&
455 !(current
->flags
& PF_FSTRANS
)) {
456 int how
= FLUSH_SYNC
;
458 /* Don't let kswapd deadlock waiting for OOM RPC calls */
459 if (current_is_kswapd())
461 nfs_commit_inode(mapping
->host
, how
);
463 /* If PagePrivate() is set, then the page is not freeable */
464 if (PagePrivate(page
))
466 return nfs_fscache_release_page(page
, gfp
);
470 * Attempt to clear the private state associated with a page when an error
471 * occurs that requires the cached contents of an inode to be written back or
473 * - Called if either PG_private or fscache is set on the page
474 * - Caller holds page lock
475 * - Return 0 if successful, -error otherwise
477 static int nfs_launder_page(struct page
*page
)
479 struct inode
*inode
= page
->mapping
->host
;
480 struct nfs_inode
*nfsi
= NFS_I(inode
);
482 dfprintk(PAGECACHE
, "NFS: launder_page(%ld, %llu)\n",
483 inode
->i_ino
, (long long)page_offset(page
));
485 nfs_fscache_wait_on_page_write(nfsi
, page
);
486 return nfs_wb_page(inode
, page
);
489 const struct address_space_operations nfs_file_aops
= {
490 .readpage
= nfs_readpage
,
491 .readpages
= nfs_readpages
,
492 .set_page_dirty
= __set_page_dirty_nobuffers
,
493 .writepage
= nfs_writepage
,
494 .writepages
= nfs_writepages
,
495 .write_begin
= nfs_write_begin
,
496 .write_end
= nfs_write_end
,
497 .invalidatepage
= nfs_invalidate_page
,
498 .releasepage
= nfs_release_page
,
499 .direct_IO
= nfs_direct_IO
,
500 .migratepage
= nfs_migrate_page
,
501 .launder_page
= nfs_launder_page
,
502 .error_remove_page
= generic_error_remove_page
,
506 * Notification that a PTE pointing to an NFS page is about to be made
507 * writable, implying that someone is about to modify the page through a
508 * shared-writable mapping
510 static int nfs_vm_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
512 struct page
*page
= vmf
->page
;
513 struct file
*filp
= vma
->vm_file
;
514 struct dentry
*dentry
= filp
->f_path
.dentry
;
516 int ret
= VM_FAULT_NOPAGE
;
517 struct address_space
*mapping
;
519 dfprintk(PAGECACHE
, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
520 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
521 filp
->f_mapping
->host
->i_ino
,
522 (long long)page_offset(page
));
524 /* make sure the cache has finished storing the page */
525 nfs_fscache_wait_on_page_write(NFS_I(dentry
->d_inode
), page
);
528 mapping
= page
->mapping
;
529 if (mapping
!= dentry
->d_inode
->i_mapping
)
532 wait_on_page_writeback(page
);
534 pagelen
= nfs_page_length(page
);
538 ret
= VM_FAULT_LOCKED
;
539 if (nfs_flush_incompatible(filp
, page
) == 0 &&
540 nfs_updatepage(filp
, page
, 0, pagelen
) == 0)
543 ret
= VM_FAULT_SIGBUS
;
550 static const struct vm_operations_struct nfs_file_vm_ops
= {
551 .fault
= filemap_fault
,
552 .page_mkwrite
= nfs_vm_page_mkwrite
,
555 static int nfs_need_sync_write(struct file
*filp
, struct inode
*inode
)
557 struct nfs_open_context
*ctx
;
559 if (IS_SYNC(inode
) || (filp
->f_flags
& O_DSYNC
))
561 ctx
= nfs_file_open_context(filp
);
562 if (test_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
))
567 ssize_t
nfs_file_write(struct kiocb
*iocb
, const struct iovec
*iov
,
568 unsigned long nr_segs
, loff_t pos
)
570 struct dentry
* dentry
= iocb
->ki_filp
->f_path
.dentry
;
571 struct inode
* inode
= dentry
->d_inode
;
572 unsigned long written
= 0;
574 size_t count
= iov_length(iov
, nr_segs
);
576 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
577 return nfs_file_direct_write(iocb
, iov
, nr_segs
, pos
);
579 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
580 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
581 (unsigned long) count
, (long long) pos
);
584 if (IS_SWAPFILE(inode
))
587 * O_APPEND implies that we must revalidate the file length.
589 if (iocb
->ki_filp
->f_flags
& O_APPEND
) {
590 result
= nfs_revalidate_file_size(inode
, iocb
->ki_filp
);
599 result
= generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
603 /* Return error values for O_DSYNC and IS_SYNC() */
604 if (result
>= 0 && nfs_need_sync_write(iocb
->ki_filp
, inode
)) {
605 int err
= vfs_fsync(iocb
->ki_filp
, 0);
610 nfs_add_stats(inode
, NFSIOS_NORMALWRITTENBYTES
, written
);
615 printk(KERN_INFO
"NFS: attempt to write to active swap file!\n");
619 ssize_t
nfs_file_splice_write(struct pipe_inode_info
*pipe
,
620 struct file
*filp
, loff_t
*ppos
,
621 size_t count
, unsigned int flags
)
623 struct dentry
*dentry
= filp
->f_path
.dentry
;
624 struct inode
*inode
= dentry
->d_inode
;
625 unsigned long written
= 0;
628 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
629 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
630 (unsigned long) count
, (unsigned long long) *ppos
);
633 * The combination of splice and an O_APPEND destination is disallowed.
636 ret
= generic_file_splice_write(pipe
, filp
, ppos
, count
, flags
);
640 if (ret
>= 0 && nfs_need_sync_write(filp
, inode
)) {
641 int err
= vfs_fsync(filp
, 0);
646 nfs_add_stats(inode
, NFSIOS_NORMALWRITTENBYTES
, written
);
651 do_getlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
653 struct inode
*inode
= filp
->f_mapping
->host
;
655 unsigned int saved_type
= fl
->fl_type
;
657 /* Try local locking first */
658 posix_test_lock(filp
, fl
);
659 if (fl
->fl_type
!= F_UNLCK
) {
660 /* found a conflict */
663 fl
->fl_type
= saved_type
;
665 if (NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
))
671 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
675 fl
->fl_type
= F_UNLCK
;
679 static int do_vfs_lock(struct file
*file
, struct file_lock
*fl
)
682 switch (fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)) {
684 res
= posix_lock_file_wait(file
, fl
);
687 res
= flock_lock_file_wait(file
, fl
);
696 do_unlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
698 struct inode
*inode
= filp
->f_mapping
->host
;
702 * Flush all pending writes before doing anything
705 nfs_sync_mapping(filp
->f_mapping
);
707 /* NOTE: special case
708 * If we're signalled while cleaning up locks on process exit, we
709 * still need to complete the unlock.
712 * Use local locking if mounted with "-onolock" or with appropriate
716 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
718 status
= do_vfs_lock(filp
, fl
);
723 is_time_granular(struct timespec
*ts
) {
724 return ((ts
->tv_sec
== 0) && (ts
->tv_nsec
<= 1000));
728 do_setlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
730 struct inode
*inode
= filp
->f_mapping
->host
;
734 * Flush all pending writes before doing anything
737 status
= nfs_sync_mapping(filp
->f_mapping
);
742 * Use local locking if mounted with "-onolock" or with appropriate
746 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
748 status
= do_vfs_lock(filp
, fl
);
753 * Revalidate the cache if the server has time stamps granular
754 * enough to detect subsecond changes. Otherwise, clear the
755 * cache to prevent missing any changes.
757 * This makes locking act as a cache coherency point.
759 nfs_sync_mapping(filp
->f_mapping
);
760 if (!NFS_PROTO(inode
)->have_delegation(inode
, FMODE_READ
)) {
761 if (is_time_granular(&NFS_SERVER(inode
)->time_delta
))
762 __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
764 nfs_zap_caches(inode
);
771 * Lock a (portion of) a file
773 int nfs_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
775 struct inode
*inode
= filp
->f_mapping
->host
;
779 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
780 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
781 filp
->f_path
.dentry
->d_name
.name
,
782 fl
->fl_type
, fl
->fl_flags
,
783 (long long)fl
->fl_start
, (long long)fl
->fl_end
);
785 nfs_inc_stats(inode
, NFSIOS_VFSLOCK
);
787 /* No mandatory locks over NFS */
788 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
791 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FCNTL
)
794 if (NFS_PROTO(inode
)->lock_check_bounds
!= NULL
) {
795 ret
= NFS_PROTO(inode
)->lock_check_bounds(fl
);
801 ret
= do_getlk(filp
, cmd
, fl
, is_local
);
802 else if (fl
->fl_type
== F_UNLCK
)
803 ret
= do_unlk(filp
, cmd
, fl
, is_local
);
805 ret
= do_setlk(filp
, cmd
, fl
, is_local
);
811 * Lock a (portion of) a file
813 int nfs_flock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
815 struct inode
*inode
= filp
->f_mapping
->host
;
818 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
819 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
820 filp
->f_path
.dentry
->d_name
.name
,
821 fl
->fl_type
, fl
->fl_flags
);
823 if (!(fl
->fl_flags
& FL_FLOCK
))
826 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FLOCK
)
829 /* We're simulating flock() locks using posix locks on the server */
830 fl
->fl_owner
= (fl_owner_t
)filp
;
832 fl
->fl_end
= OFFSET_MAX
;
834 if (fl
->fl_type
== F_UNLCK
)
835 return do_unlk(filp
, cmd
, fl
, is_local
);
836 return do_setlk(filp
, cmd
, fl
, is_local
);
840 * There is no protocol support for leases, so we have no way to implement
841 * them correctly in the face of opens by other clients.
843 int nfs_setlease(struct file
*file
, long arg
, struct file_lock
**fl
)
845 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
846 file
->f_path
.dentry
->d_parent
->d_name
.name
,
847 file
->f_path
.dentry
->d_name
.name
, arg
);
851 const struct file_operations nfs_file_operations
= {
852 .llseek
= nfs_file_llseek
,
853 .read
= do_sync_read
,
854 .write
= do_sync_write
,
855 .aio_read
= nfs_file_read
,
856 .aio_write
= nfs_file_write
,
857 .mmap
= nfs_file_mmap
,
858 .open
= nfs_file_open
,
859 .flush
= nfs_file_flush
,
860 .release
= nfs_file_release
,
861 .fsync
= nfs_file_fsync
,
864 .splice_read
= nfs_file_splice_read
,
865 .splice_write
= nfs_file_splice_write
,
866 .check_flags
= nfs_check_flags
,
867 .setlease
= nfs_setlease
,
869 EXPORT_SYMBOL_GPL(nfs_file_operations
);