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/time.h>
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/fcntl.h>
23 #include <linux/stat.h>
24 #include <linux/nfs_fs.h>
25 #include <linux/nfs_mount.h>
27 #include <linux/pagemap.h>
28 #include <linux/aio.h>
29 #include <linux/gfp.h>
30 #include <linux/swap.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.h>
35 #include "delegation.h"
41 #define NFSDBG_FACILITY NFSDBG_FILE
43 static int nfs_file_open(struct inode
*, struct file
*);
44 static int nfs_file_release(struct inode
*, struct file
*);
45 static loff_t
nfs_file_llseek(struct file
*file
, loff_t offset
, int origin
);
46 static int nfs_file_mmap(struct file
*, struct vm_area_struct
*);
47 static ssize_t
nfs_file_splice_read(struct file
*filp
, loff_t
*ppos
,
48 struct pipe_inode_info
*pipe
,
49 size_t count
, unsigned int flags
);
50 static ssize_t
nfs_file_read(struct kiocb
*, const struct iovec
*iov
,
51 unsigned long nr_segs
, loff_t pos
);
52 static ssize_t
nfs_file_splice_write(struct pipe_inode_info
*pipe
,
53 struct file
*filp
, loff_t
*ppos
,
54 size_t count
, unsigned int flags
);
55 static ssize_t
nfs_file_write(struct kiocb
*, const struct iovec
*iov
,
56 unsigned long nr_segs
, loff_t pos
);
57 static int nfs_file_flush(struct file
*, fl_owner_t id
);
58 static int nfs_file_fsync(struct file
*, loff_t
, loff_t
, int datasync
);
59 static int nfs_check_flags(int flags
);
60 static int nfs_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
);
61 static int nfs_flock(struct file
*filp
, int cmd
, struct file_lock
*fl
);
62 static int nfs_setlease(struct file
*file
, long arg
, struct file_lock
**fl
);
64 static const struct vm_operations_struct nfs_file_vm_ops
;
66 const struct file_operations nfs_file_operations
= {
67 .llseek
= nfs_file_llseek
,
69 .write
= do_sync_write
,
70 .aio_read
= nfs_file_read
,
71 .aio_write
= nfs_file_write
,
72 .mmap
= nfs_file_mmap
,
73 .open
= nfs_file_open
,
74 .flush
= nfs_file_flush
,
75 .release
= nfs_file_release
,
76 .fsync
= nfs_file_fsync
,
79 .splice_read
= nfs_file_splice_read
,
80 .splice_write
= nfs_file_splice_write
,
81 .check_flags
= nfs_check_flags
,
82 .setlease
= nfs_setlease
,
85 const struct inode_operations nfs_file_inode_operations
= {
86 .permission
= nfs_permission
,
87 .getattr
= nfs_getattr
,
88 .setattr
= nfs_setattr
,
92 const struct inode_operations nfs3_file_inode_operations
= {
93 .permission
= nfs_permission
,
94 .getattr
= nfs_getattr
,
95 .setattr
= nfs_setattr
,
96 .listxattr
= nfs3_listxattr
,
97 .getxattr
= nfs3_getxattr
,
98 .setxattr
= nfs3_setxattr
,
99 .removexattr
= nfs3_removexattr
,
101 #endif /* CONFIG_NFS_v3 */
103 /* Hack for future NFS swap support */
105 # define IS_SWAPFILE(inode) (0)
108 static int nfs_check_flags(int flags
)
110 if ((flags
& (O_APPEND
| O_DIRECT
)) == (O_APPEND
| O_DIRECT
))
120 nfs_file_open(struct inode
*inode
, struct file
*filp
)
124 dprintk("NFS: open file(%s/%s)\n",
125 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
126 filp
->f_path
.dentry
->d_name
.name
);
128 nfs_inc_stats(inode
, NFSIOS_VFSOPEN
);
129 res
= nfs_check_flags(filp
->f_flags
);
133 res
= nfs_open(inode
, filp
);
138 nfs_file_release(struct inode
*inode
, struct file
*filp
)
140 struct dentry
*dentry
= filp
->f_path
.dentry
;
142 dprintk("NFS: release(%s/%s)\n",
143 dentry
->d_parent
->d_name
.name
,
144 dentry
->d_name
.name
);
146 nfs_inc_stats(inode
, NFSIOS_VFSRELEASE
);
147 return nfs_release(inode
, filp
);
151 * nfs_revalidate_size - Revalidate the file size
152 * @inode - pointer to inode struct
153 * @file - pointer to struct file
155 * Revalidates the file length. This is basically a wrapper around
156 * nfs_revalidate_inode() that takes into account the fact that we may
157 * have cached writes (in which case we don't care about the server's
158 * idea of what the file length is), or O_DIRECT (in which case we
159 * shouldn't trust the cache).
161 static int nfs_revalidate_file_size(struct inode
*inode
, struct file
*filp
)
163 struct nfs_server
*server
= NFS_SERVER(inode
);
164 struct nfs_inode
*nfsi
= NFS_I(inode
);
166 if (nfs_have_delegated_attributes(inode
))
169 if (filp
->f_flags
& O_DIRECT
)
171 if (nfsi
->cache_validity
& NFS_INO_REVAL_PAGECACHE
)
173 if (nfs_attribute_timeout(inode
))
178 return __nfs_revalidate_inode(server
, inode
);
181 static loff_t
nfs_file_llseek(struct file
*filp
, loff_t offset
, int origin
)
185 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
186 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
187 filp
->f_path
.dentry
->d_name
.name
,
191 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
192 * the cached file length
194 if (origin
!= SEEK_SET
|| origin
!= SEEK_CUR
) {
195 struct inode
*inode
= filp
->f_mapping
->host
;
197 int retval
= nfs_revalidate_file_size(inode
, filp
);
199 return (loff_t
)retval
;
201 /* AK: should drop this lock. Unlikely to be needed. */
202 spin_lock(&inode
->i_lock
);
203 loff
= generic_file_llseek(filp
, offset
, origin
);
204 spin_unlock(&inode
->i_lock
);
206 loff
= generic_file_llseek(filp
, offset
, origin
);
211 * Flush all dirty pages, and check for write errors.
214 nfs_file_flush(struct file
*file
, fl_owner_t id
)
216 struct dentry
*dentry
= file
->f_path
.dentry
;
217 struct inode
*inode
= dentry
->d_inode
;
219 dprintk("NFS: flush(%s/%s)\n",
220 dentry
->d_parent
->d_name
.name
,
221 dentry
->d_name
.name
);
223 nfs_inc_stats(inode
, NFSIOS_VFSFLUSH
);
224 if ((file
->f_mode
& FMODE_WRITE
) == 0)
227 /* Flush writes to the server and return any errors */
228 return vfs_fsync(file
, 0);
232 nfs_file_read(struct kiocb
*iocb
, const struct iovec
*iov
,
233 unsigned long nr_segs
, loff_t pos
)
235 struct dentry
* dentry
= iocb
->ki_filp
->f_path
.dentry
;
236 struct inode
* inode
= dentry
->d_inode
;
238 size_t count
= iov_length(iov
, nr_segs
);
240 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
241 return nfs_file_direct_read(iocb
, iov
, nr_segs
, pos
);
243 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
244 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
245 (unsigned long) count
, (unsigned long) pos
);
247 result
= nfs_revalidate_mapping(inode
, iocb
->ki_filp
->f_mapping
);
249 result
= generic_file_aio_read(iocb
, iov
, nr_segs
, pos
);
251 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, result
);
257 nfs_file_splice_read(struct file
*filp
, loff_t
*ppos
,
258 struct pipe_inode_info
*pipe
, size_t count
,
261 struct dentry
*dentry
= filp
->f_path
.dentry
;
262 struct inode
*inode
= dentry
->d_inode
;
265 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
266 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
267 (unsigned long) count
, (unsigned long long) *ppos
);
269 res
= nfs_revalidate_mapping(inode
, filp
->f_mapping
);
271 res
= generic_file_splice_read(filp
, ppos
, pipe
, count
, flags
);
273 nfs_add_stats(inode
, NFSIOS_NORMALREADBYTES
, res
);
279 nfs_file_mmap(struct file
* file
, struct vm_area_struct
* vma
)
281 struct dentry
*dentry
= file
->f_path
.dentry
;
282 struct inode
*inode
= dentry
->d_inode
;
285 dprintk("NFS: mmap(%s/%s)\n",
286 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
);
288 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
289 * so we call that before revalidating the mapping
291 status
= generic_file_mmap(file
, vma
);
293 vma
->vm_ops
= &nfs_file_vm_ops
;
294 status
= nfs_revalidate_mapping(inode
, file
->f_mapping
);
300 * Flush any dirty pages for this process, and check for write errors.
301 * The return status from this call provides a reliable indication of
302 * whether any write errors occurred for this process.
304 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
305 * disk, but it retrieves and clears ctx->error after synching, despite
306 * the two being set at the same time in nfs_context_set_write_error().
307 * This is because the former is used to notify the _next_ call to
308 * nfs_file_write() that a write error occurred, and hence cause it to
309 * fall back to doing a synchronous write.
312 nfs_file_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
314 struct dentry
*dentry
= file
->f_path
.dentry
;
315 struct nfs_open_context
*ctx
= nfs_file_open_context(file
);
316 struct inode
*inode
= dentry
->d_inode
;
317 int have_error
, status
;
320 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
321 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
324 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
327 mutex_lock(&inode
->i_mutex
);
329 nfs_inc_stats(inode
, NFSIOS_VFSFSYNC
);
330 have_error
= test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
331 status
= nfs_commit_inode(inode
, FLUSH_SYNC
);
332 have_error
|= test_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
);
334 ret
= xchg(&ctx
->error
, 0);
335 if (!ret
&& status
< 0)
337 if (!ret
&& !datasync
)
338 /* application has asked for meta-data sync */
339 ret
= pnfs_layoutcommit_inode(inode
, true);
340 mutex_unlock(&inode
->i_mutex
);
345 * Decide whether a read/modify/write cycle may be more efficient
346 * then a modify/write/read cycle when writing to a page in the
349 * The modify/write/read cycle may occur if a page is read before
350 * being completely filled by the writer. In this situation, the
351 * page must be completely written to stable storage on the server
352 * before it can be refilled by reading in the page from the server.
353 * This can lead to expensive, small, FILE_SYNC mode writes being
356 * It may be more efficient to read the page first if the file is
357 * open for reading in addition to writing, the page is not marked
358 * as Uptodate, it is not dirty or waiting to be committed,
359 * indicating that it was previously allocated and then modified,
360 * that there were valid bytes of data in that range of the file,
361 * and that the new data won't completely replace the old data in
362 * that range of the file.
364 static int nfs_want_read_modify_write(struct file
*file
, struct page
*page
,
365 loff_t pos
, unsigned len
)
367 unsigned int pglen
= nfs_page_length(page
);
368 unsigned int offset
= pos
& (PAGE_CACHE_SIZE
- 1);
369 unsigned int end
= offset
+ len
;
371 if ((file
->f_mode
& FMODE_READ
) && /* open for read? */
372 !PageUptodate(page
) && /* Uptodate? */
373 !PagePrivate(page
) && /* i/o request already? */
374 pglen
&& /* valid bytes of file? */
375 (end
< pglen
|| offset
)) /* replace all valid bytes? */
381 * This does the "real" work of the write. We must allocate and lock the
382 * page to be sent back to the generic routine, which then copies the
383 * data from user space.
385 * If the writer ends up delaying the write, the writer needs to
386 * increment the page use counts until he is done with the page.
388 static int nfs_write_begin(struct file
*file
, struct address_space
*mapping
,
389 loff_t pos
, unsigned len
, unsigned flags
,
390 struct page
**pagep
, void **fsdata
)
393 pgoff_t index
= pos
>> PAGE_CACHE_SHIFT
;
397 dfprintk(PAGECACHE
, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
398 file
->f_path
.dentry
->d_parent
->d_name
.name
,
399 file
->f_path
.dentry
->d_name
.name
,
400 mapping
->host
->i_ino
, len
, (long long) pos
);
404 * Prevent starvation issues if someone is doing a consistency
407 ret
= wait_on_bit(&NFS_I(mapping
->host
)->flags
, NFS_INO_FLUSHING
,
408 nfs_wait_bit_killable
, TASK_KILLABLE
);
412 page
= grab_cache_page_write_begin(mapping
, index
, flags
);
417 ret
= nfs_flush_incompatible(file
, page
);
420 page_cache_release(page
);
421 } else if (!once_thru
&&
422 nfs_want_read_modify_write(file
, page
, pos
, len
)) {
424 ret
= nfs_readpage(file
, page
);
425 page_cache_release(page
);
432 static int nfs_write_end(struct file
*file
, struct address_space
*mapping
,
433 loff_t pos
, unsigned len
, unsigned copied
,
434 struct page
*page
, void *fsdata
)
436 unsigned offset
= pos
& (PAGE_CACHE_SIZE
- 1);
439 dfprintk(PAGECACHE
, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
440 file
->f_path
.dentry
->d_parent
->d_name
.name
,
441 file
->f_path
.dentry
->d_name
.name
,
442 mapping
->host
->i_ino
, len
, (long long) pos
);
445 * Zero any uninitialised parts of the page, and then mark the page
446 * as up to date if it turns out that we're extending the file.
448 if (!PageUptodate(page
)) {
449 unsigned pglen
= nfs_page_length(page
);
450 unsigned end
= offset
+ len
;
453 zero_user_segments(page
, 0, offset
,
454 end
, PAGE_CACHE_SIZE
);
455 SetPageUptodate(page
);
456 } else if (end
>= pglen
) {
457 zero_user_segment(page
, end
, PAGE_CACHE_SIZE
);
459 SetPageUptodate(page
);
461 zero_user_segment(page
, pglen
, PAGE_CACHE_SIZE
);
464 status
= nfs_updatepage(file
, page
, offset
, copied
);
467 page_cache_release(page
);
475 * Partially or wholly invalidate a page
476 * - Release the private state associated with a page if undergoing complete
478 * - Called if either PG_private or PG_fscache is set on the page
479 * - Caller holds page lock
481 static void nfs_invalidate_page(struct page
*page
, unsigned long offset
)
483 dfprintk(PAGECACHE
, "NFS: invalidate_page(%p, %lu)\n", page
, offset
);
487 /* Cancel any unstarted writes on this page */
488 nfs_wb_page_cancel(page
->mapping
->host
, page
);
490 nfs_fscache_invalidate_page(page
, page
->mapping
->host
);
494 * Attempt to release the private state associated with a page
495 * - Called if either PG_private or PG_fscache is set on the page
496 * - Caller holds page lock
497 * - Return true (may release page) or false (may not)
499 static int nfs_release_page(struct page
*page
, gfp_t gfp
)
501 struct address_space
*mapping
= page
->mapping
;
503 dfprintk(PAGECACHE
, "NFS: release_page(%p)\n", page
);
505 /* Only do I/O if gfp is a superset of GFP_KERNEL */
506 if (mapping
&& (gfp
& GFP_KERNEL
) == GFP_KERNEL
) {
507 int how
= FLUSH_SYNC
;
509 /* Don't let kswapd deadlock waiting for OOM RPC calls */
510 if (current_is_kswapd())
512 nfs_commit_inode(mapping
->host
, how
);
514 /* If PagePrivate() is set, then the page is not freeable */
515 if (PagePrivate(page
))
517 return nfs_fscache_release_page(page
, gfp
);
521 * Attempt to clear the private state associated with a page when an error
522 * occurs that requires the cached contents of an inode to be written back or
524 * - Called if either PG_private or fscache is set on the page
525 * - Caller holds page lock
526 * - Return 0 if successful, -error otherwise
528 static int nfs_launder_page(struct page
*page
)
530 struct inode
*inode
= page
->mapping
->host
;
531 struct nfs_inode
*nfsi
= NFS_I(inode
);
533 dfprintk(PAGECACHE
, "NFS: launder_page(%ld, %llu)\n",
534 inode
->i_ino
, (long long)page_offset(page
));
536 nfs_fscache_wait_on_page_write(nfsi
, page
);
537 return nfs_wb_page(inode
, page
);
540 const struct address_space_operations nfs_file_aops
= {
541 .readpage
= nfs_readpage
,
542 .readpages
= nfs_readpages
,
543 .set_page_dirty
= __set_page_dirty_nobuffers
,
544 .writepage
= nfs_writepage
,
545 .writepages
= nfs_writepages
,
546 .write_begin
= nfs_write_begin
,
547 .write_end
= nfs_write_end
,
548 .invalidatepage
= nfs_invalidate_page
,
549 .releasepage
= nfs_release_page
,
550 .direct_IO
= nfs_direct_IO
,
551 .migratepage
= nfs_migrate_page
,
552 .launder_page
= nfs_launder_page
,
553 .error_remove_page
= generic_error_remove_page
,
557 * Notification that a PTE pointing to an NFS page is about to be made
558 * writable, implying that someone is about to modify the page through a
559 * shared-writable mapping
561 static int nfs_vm_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
563 struct page
*page
= vmf
->page
;
564 struct file
*filp
= vma
->vm_file
;
565 struct dentry
*dentry
= filp
->f_path
.dentry
;
567 int ret
= VM_FAULT_NOPAGE
;
568 struct address_space
*mapping
;
570 dfprintk(PAGECACHE
, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
571 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
572 filp
->f_mapping
->host
->i_ino
,
573 (long long)page_offset(page
));
575 /* make sure the cache has finished storing the page */
576 nfs_fscache_wait_on_page_write(NFS_I(dentry
->d_inode
), page
);
579 mapping
= page
->mapping
;
580 if (mapping
!= dentry
->d_inode
->i_mapping
)
583 pagelen
= nfs_page_length(page
);
587 ret
= VM_FAULT_LOCKED
;
588 if (nfs_flush_incompatible(filp
, page
) == 0 &&
589 nfs_updatepage(filp
, page
, 0, pagelen
) == 0)
592 ret
= VM_FAULT_SIGBUS
;
599 static const struct vm_operations_struct nfs_file_vm_ops
= {
600 .fault
= filemap_fault
,
601 .page_mkwrite
= nfs_vm_page_mkwrite
,
604 static int nfs_need_sync_write(struct file
*filp
, struct inode
*inode
)
606 struct nfs_open_context
*ctx
;
608 if (IS_SYNC(inode
) || (filp
->f_flags
& O_DSYNC
))
610 ctx
= nfs_file_open_context(filp
);
611 if (test_bit(NFS_CONTEXT_ERROR_WRITE
, &ctx
->flags
))
616 static ssize_t
nfs_file_write(struct kiocb
*iocb
, const struct iovec
*iov
,
617 unsigned long nr_segs
, loff_t pos
)
619 struct dentry
* dentry
= iocb
->ki_filp
->f_path
.dentry
;
620 struct inode
* inode
= dentry
->d_inode
;
621 unsigned long written
= 0;
623 size_t count
= iov_length(iov
, nr_segs
);
625 if (iocb
->ki_filp
->f_flags
& O_DIRECT
)
626 return nfs_file_direct_write(iocb
, iov
, nr_segs
, pos
);
628 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
629 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
630 (unsigned long) count
, (long long) pos
);
633 if (IS_SWAPFILE(inode
))
636 * O_APPEND implies that we must revalidate the file length.
638 if (iocb
->ki_filp
->f_flags
& O_APPEND
) {
639 result
= nfs_revalidate_file_size(inode
, iocb
->ki_filp
);
648 result
= generic_file_aio_write(iocb
, iov
, nr_segs
, pos
);
652 /* Return error values for O_DSYNC and IS_SYNC() */
653 if (result
>= 0 && nfs_need_sync_write(iocb
->ki_filp
, inode
)) {
654 int err
= vfs_fsync(iocb
->ki_filp
, 0);
659 nfs_add_stats(inode
, NFSIOS_NORMALWRITTENBYTES
, written
);
664 printk(KERN_INFO
"NFS: attempt to write to active swap file!\n");
668 static ssize_t
nfs_file_splice_write(struct pipe_inode_info
*pipe
,
669 struct file
*filp
, loff_t
*ppos
,
670 size_t count
, unsigned int flags
)
672 struct dentry
*dentry
= filp
->f_path
.dentry
;
673 struct inode
*inode
= dentry
->d_inode
;
674 unsigned long written
= 0;
677 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
678 dentry
->d_parent
->d_name
.name
, dentry
->d_name
.name
,
679 (unsigned long) count
, (unsigned long long) *ppos
);
682 * The combination of splice and an O_APPEND destination is disallowed.
685 ret
= generic_file_splice_write(pipe
, filp
, ppos
, count
, flags
);
689 if (ret
>= 0 && nfs_need_sync_write(filp
, inode
)) {
690 int err
= vfs_fsync(filp
, 0);
695 nfs_add_stats(inode
, NFSIOS_NORMALWRITTENBYTES
, written
);
700 do_getlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
702 struct inode
*inode
= filp
->f_mapping
->host
;
704 unsigned int saved_type
= fl
->fl_type
;
706 /* Try local locking first */
707 posix_test_lock(filp
, fl
);
708 if (fl
->fl_type
!= F_UNLCK
) {
709 /* found a conflict */
712 fl
->fl_type
= saved_type
;
714 if (nfs_have_delegation(inode
, FMODE_READ
))
720 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
724 fl
->fl_type
= F_UNLCK
;
728 static int do_vfs_lock(struct file
*file
, struct file_lock
*fl
)
731 switch (fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)) {
733 res
= posix_lock_file_wait(file
, fl
);
736 res
= flock_lock_file_wait(file
, fl
);
745 do_unlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
747 struct inode
*inode
= filp
->f_mapping
->host
;
751 * Flush all pending writes before doing anything
754 nfs_sync_mapping(filp
->f_mapping
);
756 /* NOTE: special case
757 * If we're signalled while cleaning up locks on process exit, we
758 * still need to complete the unlock.
761 * Use local locking if mounted with "-onolock" or with appropriate
765 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
767 status
= do_vfs_lock(filp
, fl
);
772 is_time_granular(struct timespec
*ts
) {
773 return ((ts
->tv_sec
== 0) && (ts
->tv_nsec
<= 1000));
777 do_setlk(struct file
*filp
, int cmd
, struct file_lock
*fl
, int is_local
)
779 struct inode
*inode
= filp
->f_mapping
->host
;
783 * Flush all pending writes before doing anything
786 status
= nfs_sync_mapping(filp
->f_mapping
);
791 * Use local locking if mounted with "-onolock" or with appropriate
795 status
= NFS_PROTO(inode
)->lock(filp
, cmd
, fl
);
797 status
= do_vfs_lock(filp
, fl
);
802 * Revalidate the cache if the server has time stamps granular
803 * enough to detect subsecond changes. Otherwise, clear the
804 * cache to prevent missing any changes.
806 * This makes locking act as a cache coherency point.
808 nfs_sync_mapping(filp
->f_mapping
);
809 if (!nfs_have_delegation(inode
, FMODE_READ
)) {
810 if (is_time_granular(&NFS_SERVER(inode
)->time_delta
))
811 __nfs_revalidate_inode(NFS_SERVER(inode
), inode
);
813 nfs_zap_caches(inode
);
820 * Lock a (portion of) a file
822 static int nfs_lock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
824 struct inode
*inode
= filp
->f_mapping
->host
;
828 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
829 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
830 filp
->f_path
.dentry
->d_name
.name
,
831 fl
->fl_type
, fl
->fl_flags
,
832 (long long)fl
->fl_start
, (long long)fl
->fl_end
);
834 nfs_inc_stats(inode
, NFSIOS_VFSLOCK
);
836 /* No mandatory locks over NFS */
837 if (__mandatory_lock(inode
) && fl
->fl_type
!= F_UNLCK
)
840 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FCNTL
)
843 if (NFS_PROTO(inode
)->lock_check_bounds
!= NULL
) {
844 ret
= NFS_PROTO(inode
)->lock_check_bounds(fl
);
850 ret
= do_getlk(filp
, cmd
, fl
, is_local
);
851 else if (fl
->fl_type
== F_UNLCK
)
852 ret
= do_unlk(filp
, cmd
, fl
, is_local
);
854 ret
= do_setlk(filp
, cmd
, fl
, is_local
);
860 * Lock a (portion of) a file
862 static int nfs_flock(struct file
*filp
, int cmd
, struct file_lock
*fl
)
864 struct inode
*inode
= filp
->f_mapping
->host
;
867 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
868 filp
->f_path
.dentry
->d_parent
->d_name
.name
,
869 filp
->f_path
.dentry
->d_name
.name
,
870 fl
->fl_type
, fl
->fl_flags
);
872 if (!(fl
->fl_flags
& FL_FLOCK
))
875 if (NFS_SERVER(inode
)->flags
& NFS_MOUNT_LOCAL_FLOCK
)
878 /* We're simulating flock() locks using posix locks on the server */
879 fl
->fl_owner
= (fl_owner_t
)filp
;
881 fl
->fl_end
= OFFSET_MAX
;
883 if (fl
->fl_type
== F_UNLCK
)
884 return do_unlk(filp
, cmd
, fl
, is_local
);
885 return do_setlk(filp
, cmd
, fl
, is_local
);
889 * There is no protocol support for leases, so we have no way to implement
890 * them correctly in the face of opens by other clients.
892 static int nfs_setlease(struct file
*file
, long arg
, struct file_lock
**fl
)
894 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
895 file
->f_path
.dentry
->d_parent
->d_name
.name
,
896 file
->f_path
.dentry
->d_name
.name
, arg
);