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/gfp.h>
30 #include <linux/swap.h>
32 #include <asm/uaccess.h>
34 #include "delegation.h"
42 #define NFSDBG_FACILITY NFSDBG_FILE
44 static const struct vm_operations_struct nfs_file_vm_ops;
46 /* Hack for future NFS swap support */
48 # define IS_SWAPFILE(inode) (0)
51 int nfs_check_flags(int flags)
53 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
58 EXPORT_SYMBOL_GPL(nfs_check_flags);
64 nfs_file_open(struct inode *inode, struct file *filp)
68 dprintk("NFS: open file(%pD2)\n", filp);
70 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
71 res = nfs_check_flags(filp->f_flags);
75 res = nfs_open(inode, filp);
80 nfs_file_release(struct inode *inode, struct file *filp)
82 dprintk("NFS: release(%pD2)\n", filp);
84 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
85 return nfs_release(inode, filp);
87 EXPORT_SYMBOL_GPL(nfs_file_release);
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 whence)
122 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
123 filp, offset, whence);
126 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
127 * the cached file length
129 if (whence != SEEK_SET && whence != SEEK_CUR) {
130 struct inode *inode = filp->f_mapping->host;
132 int retval = nfs_revalidate_file_size(inode, filp);
134 return (loff_t)retval;
137 return generic_file_llseek(filp, offset, whence);
139 EXPORT_SYMBOL_GPL(nfs_file_llseek);
142 * Flush all dirty pages, and check for write errors.
145 nfs_file_flush(struct file *file, fl_owner_t id)
147 struct inode *inode = file_inode(file);
149 dprintk("NFS: flush(%pD2)\n", file);
151 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
152 if ((file->f_mode & FMODE_WRITE) == 0)
156 * If we're holding a write delegation, then just start the i/o
157 * but don't wait for completion (or send a commit).
159 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
160 return filemap_fdatawrite(file->f_mapping);
162 /* Flush writes to the server and return any errors */
163 return vfs_fsync(file, 0);
165 EXPORT_SYMBOL_GPL(nfs_file_flush);
168 nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
170 struct inode *inode = file_inode(iocb->ki_filp);
173 if (iocb->ki_filp->f_flags & O_DIRECT)
174 return nfs_file_direct_read(iocb, to, iocb->ki_pos);
176 dprintk("NFS: read(%pD2, %zu@%lu)\n",
178 iov_iter_count(to), (unsigned long) iocb->ki_pos);
180 result = nfs_revalidate_mapping_protected(inode, iocb->ki_filp->f_mapping);
182 result = generic_file_read_iter(iocb, to);
184 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
188 EXPORT_SYMBOL_GPL(nfs_file_read);
191 nfs_file_splice_read(struct file *filp, loff_t *ppos,
192 struct pipe_inode_info *pipe, size_t count,
195 struct inode *inode = file_inode(filp);
198 dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n",
199 filp, (unsigned long) count, (unsigned long long) *ppos);
201 res = nfs_revalidate_mapping_protected(inode, filp->f_mapping);
203 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
205 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
209 EXPORT_SYMBOL_GPL(nfs_file_splice_read);
212 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
214 struct inode *inode = file_inode(file);
217 dprintk("NFS: mmap(%pD2)\n", file);
219 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
220 * so we call that before revalidating the mapping
222 status = generic_file_mmap(file, vma);
224 vma->vm_ops = &nfs_file_vm_ops;
225 status = nfs_revalidate_mapping(inode, file->f_mapping);
229 EXPORT_SYMBOL_GPL(nfs_file_mmap);
232 * Flush any dirty pages for this process, and check for write errors.
233 * The return status from this call provides a reliable indication of
234 * whether any write errors occurred for this process.
236 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
237 * disk, but it retrieves and clears ctx->error after synching, despite
238 * the two being set at the same time in nfs_context_set_write_error().
239 * This is because the former is used to notify the _next_ call to
240 * nfs_file_write() that a write error occurred, and hence cause it to
241 * fall back to doing a synchronous write.
244 nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
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;
251 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
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);
259 ret = xchg(&ctx->error, 0);
267 do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
273 EXPORT_SYMBOL_GPL(nfs_file_fsync_commit);
276 nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
279 struct inode *inode = file_inode(file);
281 trace_nfs_fsync_enter(inode);
284 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
287 mutex_lock(&inode->i_mutex);
288 ret = nfs_file_fsync_commit(file, start, end, datasync);
289 mutex_unlock(&inode->i_mutex);
291 * If nfs_file_fsync_commit detected a server reboot, then
292 * resend all dirty pages that might have been covered by
293 * the NFS_CONTEXT_RESEND_WRITES flag
297 } while (ret == -EAGAIN);
299 trace_nfs_fsync_exit(inode, ret);
304 * Decide whether a read/modify/write cycle may be more efficient
305 * then a modify/write/read cycle when writing to a page in the
308 * The modify/write/read cycle may occur if a page is read before
309 * being completely filled by the writer. In this situation, the
310 * page must be completely written to stable storage on the server
311 * before it can be refilled by reading in the page from the server.
312 * This can lead to expensive, small, FILE_SYNC mode writes being
315 * It may be more efficient to read the page first if the file is
316 * open for reading in addition to writing, the page is not marked
317 * as Uptodate, it is not dirty or waiting to be committed,
318 * indicating that it was previously allocated and then modified,
319 * that there were valid bytes of data in that range of the file,
320 * and that the new data won't completely replace the old data in
321 * that range of the file.
323 static int nfs_want_read_modify_write(struct file *file, struct page *page,
324 loff_t pos, unsigned len)
326 unsigned int pglen = nfs_page_length(page);
327 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
328 unsigned int end = offset + len;
330 if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
331 if (!PageUptodate(page))
336 if ((file->f_mode & FMODE_READ) && /* open for read? */
337 !PageUptodate(page) && /* Uptodate? */
338 !PagePrivate(page) && /* i/o request already? */
339 pglen && /* valid bytes of file? */
340 (end < pglen || offset)) /* replace all valid bytes? */
346 * This does the "real" work of the write. We must allocate and lock the
347 * page to be sent back to the generic routine, which then copies the
348 * data from user space.
350 * If the writer ends up delaying the write, the writer needs to
351 * increment the page use counts until he is done with the page.
353 static int nfs_write_begin(struct file *file, struct address_space *mapping,
354 loff_t pos, unsigned len, unsigned flags,
355 struct page **pagep, void **fsdata)
358 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
362 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
363 file, mapping->host->i_ino, len, (long long) pos);
367 * Prevent starvation issues if someone is doing a consistency
370 ret = wait_on_bit_action(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
371 nfs_wait_bit_killable, TASK_KILLABLE);
375 * Wait for O_DIRECT to complete
377 nfs_inode_dio_wait(mapping->host);
379 page = grab_cache_page_write_begin(mapping, index, flags);
384 ret = nfs_flush_incompatible(file, page);
387 page_cache_release(page);
388 } else if (!once_thru &&
389 nfs_want_read_modify_write(file, page, pos, len)) {
391 ret = nfs_readpage(file, page);
392 page_cache_release(page);
399 static int nfs_write_end(struct file *file, struct address_space *mapping,
400 loff_t pos, unsigned len, unsigned copied,
401 struct page *page, void *fsdata)
403 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
404 struct nfs_open_context *ctx = nfs_file_open_context(file);
407 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
408 file, mapping->host->i_ino, len, (long long) pos);
411 * Zero any uninitialised parts of the page, and then mark the page
412 * as up to date if it turns out that we're extending the file.
414 if (!PageUptodate(page)) {
415 unsigned pglen = nfs_page_length(page);
416 unsigned end = offset + len;
419 zero_user_segments(page, 0, offset,
420 end, PAGE_CACHE_SIZE);
421 SetPageUptodate(page);
422 } else if (end >= pglen) {
423 zero_user_segment(page, end, PAGE_CACHE_SIZE);
425 SetPageUptodate(page);
427 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
430 status = nfs_updatepage(file, page, offset, copied);
433 page_cache_release(page);
437 NFS_I(mapping->host)->write_io += copied;
439 if (nfs_ctx_key_to_expire(ctx)) {
440 status = nfs_wb_all(mapping->host);
449 * Partially or wholly invalidate a page
450 * - Release the private state associated with a page if undergoing complete
452 * - Called if either PG_private or PG_fscache is set on the page
453 * - Caller holds page lock
455 static void nfs_invalidate_page(struct page *page, unsigned int offset,
458 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
459 page, offset, length);
461 if (offset != 0 || length < PAGE_CACHE_SIZE)
463 /* Cancel any unstarted writes on this page */
464 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
466 nfs_fscache_invalidate_page(page, page->mapping->host);
470 * Attempt to release the private state associated with a page
471 * - Called if either PG_private or PG_fscache is set on the page
472 * - Caller holds page lock
473 * - Return true (may release page) or false (may not)
475 static int nfs_release_page(struct page *page, gfp_t gfp)
477 struct address_space *mapping = page->mapping;
479 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
481 /* Always try to initiate a 'commit' if relevant, but only
482 * wait for it if __GFP_WAIT is set. Even then, only wait 1
483 * second and only if the 'bdi' is not congested.
484 * Waiting indefinitely can cause deadlocks when the NFS
485 * server is on this machine, when a new TCP connection is
486 * needed and in other rare cases. There is no particular
487 * need to wait extensively here. A short wait has the
488 * benefit that someone else can worry about the freezer.
491 struct nfs_server *nfss = NFS_SERVER(mapping->host);
492 nfs_commit_inode(mapping->host, 0);
493 if ((gfp & __GFP_WAIT) &&
494 !bdi_write_congested(&nfss->backing_dev_info)) {
495 wait_on_page_bit_killable_timeout(page, PG_private,
497 if (PagePrivate(page))
498 set_bdi_congested(&nfss->backing_dev_info,
502 /* If PagePrivate() is set, then the page is not freeable */
503 if (PagePrivate(page))
505 return nfs_fscache_release_page(page, gfp);
508 static void nfs_check_dirty_writeback(struct page *page,
509 bool *dirty, bool *writeback)
511 struct nfs_inode *nfsi;
512 struct address_space *mapping = page_file_mapping(page);
514 if (!mapping || PageSwapCache(page))
518 * Check if an unstable page is currently being committed and
519 * if so, have the VM treat it as if the page is under writeback
520 * so it will not block due to pages that will shortly be freeable.
522 nfsi = NFS_I(mapping->host);
523 if (test_bit(NFS_INO_COMMIT, &nfsi->flags)) {
529 * If PagePrivate() is set, then the page is not freeable and as the
530 * inode is not being committed, it's not going to be cleaned in the
531 * near future so treat it as dirty
533 if (PagePrivate(page))
538 * Attempt to clear the private state associated with a page when an error
539 * occurs that requires the cached contents of an inode to be written back or
541 * - Called if either PG_private or fscache is set on the page
542 * - Caller holds page lock
543 * - Return 0 if successful, -error otherwise
545 static int nfs_launder_page(struct page *page)
547 struct inode *inode = page_file_mapping(page)->host;
548 struct nfs_inode *nfsi = NFS_I(inode);
550 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
551 inode->i_ino, (long long)page_offset(page));
553 nfs_fscache_wait_on_page_write(nfsi, page);
554 return nfs_wb_page(inode, page);
557 #ifdef CONFIG_NFS_SWAP
558 static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
562 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
567 ret = xs_swapper(rcu_dereference(clnt->cl_xprt), 1);
573 static void nfs_swap_deactivate(struct file *file)
575 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
578 xs_swapper(rcu_dereference(clnt->cl_xprt), 0);
583 const struct address_space_operations nfs_file_aops = {
584 .readpage = nfs_readpage,
585 .readpages = nfs_readpages,
586 .set_page_dirty = __set_page_dirty_nobuffers,
587 .writepage = nfs_writepage,
588 .writepages = nfs_writepages,
589 .write_begin = nfs_write_begin,
590 .write_end = nfs_write_end,
591 .invalidatepage = nfs_invalidate_page,
592 .releasepage = nfs_release_page,
593 .direct_IO = nfs_direct_IO,
594 .migratepage = nfs_migrate_page,
595 .launder_page = nfs_launder_page,
596 .is_dirty_writeback = nfs_check_dirty_writeback,
597 .error_remove_page = generic_error_remove_page,
598 #ifdef CONFIG_NFS_SWAP
599 .swap_activate = nfs_swap_activate,
600 .swap_deactivate = nfs_swap_deactivate,
605 * Notification that a PTE pointing to an NFS page is about to be made
606 * writable, implying that someone is about to modify the page through a
607 * shared-writable mapping
609 static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
611 struct page *page = vmf->page;
612 struct file *filp = vma->vm_file;
613 struct inode *inode = file_inode(filp);
615 int ret = VM_FAULT_NOPAGE;
616 struct address_space *mapping;
618 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
619 filp, filp->f_mapping->host->i_ino,
620 (long long)page_offset(page));
622 /* make sure the cache has finished storing the page */
623 nfs_fscache_wait_on_page_write(NFS_I(inode), page);
625 wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
626 nfs_wait_bit_killable, TASK_KILLABLE);
629 mapping = page_file_mapping(page);
630 if (mapping != inode->i_mapping)
633 wait_on_page_writeback(page);
635 pagelen = nfs_page_length(page);
639 ret = VM_FAULT_LOCKED;
640 if (nfs_flush_incompatible(filp, page) == 0 &&
641 nfs_updatepage(filp, page, 0, pagelen) == 0)
644 ret = VM_FAULT_SIGBUS;
651 static const struct vm_operations_struct nfs_file_vm_ops = {
652 .fault = filemap_fault,
653 .map_pages = filemap_map_pages,
654 .page_mkwrite = nfs_vm_page_mkwrite,
657 static int nfs_need_sync_write(struct file *filp, struct inode *inode)
659 struct nfs_open_context *ctx;
661 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
663 ctx = nfs_file_open_context(filp);
664 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
665 nfs_ctx_key_to_expire(ctx))
670 ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
672 struct file *file = iocb->ki_filp;
673 struct inode *inode = file_inode(file);
674 unsigned long written = 0;
676 size_t count = iov_iter_count(from);
677 loff_t pos = iocb->ki_pos;
679 result = nfs_key_timeout_notify(file, inode);
683 if (file->f_flags & O_DIRECT)
684 return nfs_file_direct_write(iocb, from, pos);
686 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
687 file, count, (long long) pos);
690 if (IS_SWAPFILE(inode))
693 * O_APPEND implies that we must revalidate the file length.
695 if (file->f_flags & O_APPEND) {
696 result = nfs_revalidate_file_size(inode, file);
705 result = generic_file_write_iter(iocb, from);
709 /* Return error values for O_DSYNC and IS_SYNC() */
710 if (result >= 0 && nfs_need_sync_write(file, inode)) {
711 int err = vfs_fsync(file, 0);
716 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
721 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
724 EXPORT_SYMBOL_GPL(nfs_file_write);
727 do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
729 struct inode *inode = filp->f_mapping->host;
731 unsigned int saved_type = fl->fl_type;
733 /* Try local locking first */
734 posix_test_lock(filp, fl);
735 if (fl->fl_type != F_UNLCK) {
736 /* found a conflict */
739 fl->fl_type = saved_type;
741 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
747 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
751 fl->fl_type = F_UNLCK;
755 static int do_vfs_lock(struct file *file, struct file_lock *fl)
758 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
760 res = posix_lock_file_wait(file, fl);
763 res = flock_lock_file_wait(file, fl);
772 do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
774 struct inode *inode = filp->f_mapping->host;
775 struct nfs_lock_context *l_ctx;
779 * Flush all pending writes before doing anything
782 nfs_sync_mapping(filp->f_mapping);
784 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
785 if (!IS_ERR(l_ctx)) {
786 status = nfs_iocounter_wait(&l_ctx->io_count);
787 nfs_put_lock_context(l_ctx);
792 /* NOTE: special case
793 * If we're signalled while cleaning up locks on process exit, we
794 * still need to complete the unlock.
797 * Use local locking if mounted with "-onolock" or with appropriate
801 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
803 status = do_vfs_lock(filp, fl);
808 is_time_granular(struct timespec *ts) {
809 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
813 do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
815 struct inode *inode = filp->f_mapping->host;
819 * Flush all pending writes before doing anything
822 status = nfs_sync_mapping(filp->f_mapping);
827 * Use local locking if mounted with "-onolock" or with appropriate
831 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
833 status = do_vfs_lock(filp, fl);
838 * Revalidate the cache if the server has time stamps granular
839 * enough to detect subsecond changes. Otherwise, clear the
840 * cache to prevent missing any changes.
842 * This makes locking act as a cache coherency point.
844 nfs_sync_mapping(filp->f_mapping);
845 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
846 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
847 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
849 nfs_zap_caches(inode);
856 * Lock a (portion of) a file
858 int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
860 struct inode *inode = filp->f_mapping->host;
864 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
865 filp, fl->fl_type, fl->fl_flags,
866 (long long)fl->fl_start, (long long)fl->fl_end);
868 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
870 /* No mandatory locks over NFS */
871 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
874 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
877 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
878 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
884 ret = do_getlk(filp, cmd, fl, is_local);
885 else if (fl->fl_type == F_UNLCK)
886 ret = do_unlk(filp, cmd, fl, is_local);
888 ret = do_setlk(filp, cmd, fl, is_local);
892 EXPORT_SYMBOL_GPL(nfs_lock);
895 * Lock a (portion of) a file
897 int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
899 struct inode *inode = filp->f_mapping->host;
902 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
903 filp, fl->fl_type, fl->fl_flags);
905 if (!(fl->fl_flags & FL_FLOCK))
909 * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
910 * any standard. In principle we might be able to support LOCK_MAND
911 * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
912 * NFS code is not set up for it.
914 if (fl->fl_type & LOCK_MAND)
917 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
920 /* We're simulating flock() locks using posix locks on the server */
921 if (fl->fl_type == F_UNLCK)
922 return do_unlk(filp, cmd, fl, is_local);
923 return do_setlk(filp, cmd, fl, is_local);
925 EXPORT_SYMBOL_GPL(nfs_flock);
927 const struct file_operations nfs_file_operations = {
928 .llseek = nfs_file_llseek,
929 .read = new_sync_read,
930 .write = new_sync_write,
931 .read_iter = nfs_file_read,
932 .write_iter = nfs_file_write,
933 .mmap = nfs_file_mmap,
934 .open = nfs_file_open,
935 .flush = nfs_file_flush,
936 .release = nfs_file_release,
937 .fsync = nfs_file_fsync,
940 .splice_read = nfs_file_splice_read,
941 .splice_write = iter_file_splice_write,
942 .check_flags = nfs_check_flags,
943 .setlease = simple_nosetlease,
945 EXPORT_SYMBOL_GPL(nfs_file_operations);