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))
56 EXPORT_SYMBOL_GPL(nfs_check_flags);
62 nfs_file_open(struct inode *inode, struct file *filp)
66 dprintk("NFS: open file(%s/%s)\n",
67 filp->f_path.dentry->d_parent->d_name.name,
68 filp->f_path.dentry->d_name.name);
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(%s/%s)\n",
83 filp->f_path.dentry->d_parent->d_name.name,
84 filp->f_path.dentry->d_name.name);
86 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
87 return nfs_release(inode, filp);
89 EXPORT_SYMBOL_GPL(nfs_file_release);
92 * nfs_revalidate_size - Revalidate the file size
93 * @inode - pointer to inode struct
94 * @file - pointer to struct file
96 * Revalidates the file length. This is basically a wrapper around
97 * nfs_revalidate_inode() that takes into account the fact that we may
98 * have cached writes (in which case we don't care about the server's
99 * idea of what the file length is), or O_DIRECT (in which case we
100 * shouldn't trust the cache).
102 static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
104 struct nfs_server *server = NFS_SERVER(inode);
105 struct nfs_inode *nfsi = NFS_I(inode);
107 if (nfs_have_delegated_attributes(inode))
110 if (filp->f_flags & O_DIRECT)
112 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
114 if (nfs_attribute_timeout(inode))
119 return __nfs_revalidate_inode(server, inode);
122 loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
124 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
125 filp->f_path.dentry->d_parent->d_name.name,
126 filp->f_path.dentry->d_name.name,
130 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
131 * the cached file length
133 if (origin != SEEK_SET && origin != SEEK_CUR) {
134 struct inode *inode = filp->f_mapping->host;
136 int retval = nfs_revalidate_file_size(inode, filp);
138 return (loff_t)retval;
141 return generic_file_llseek(filp, offset, origin);
143 EXPORT_SYMBOL_GPL(nfs_file_llseek);
146 * Flush all dirty pages, and check for write errors.
149 nfs_file_flush(struct file *file, fl_owner_t id)
151 struct dentry *dentry = file->f_path.dentry;
152 struct inode *inode = dentry->d_inode;
154 dprintk("NFS: flush(%s/%s)\n",
155 dentry->d_parent->d_name.name,
156 dentry->d_name.name);
158 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
159 if ((file->f_mode & FMODE_WRITE) == 0)
163 * If we're holding a write delegation, then just start the i/o
164 * but don't wait for completion (or send a commit).
166 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
167 return filemap_fdatawrite(file->f_mapping);
169 /* Flush writes to the server and return any errors */
170 return vfs_fsync(file, 0);
172 EXPORT_SYMBOL_GPL(nfs_file_flush);
175 nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
176 unsigned long nr_segs, loff_t pos)
178 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
179 struct inode * inode = dentry->d_inode;
182 if (iocb->ki_filp->f_flags & O_DIRECT)
183 return nfs_file_direct_read(iocb, iov, nr_segs, pos, true);
185 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
186 dentry->d_parent->d_name.name, dentry->d_name.name,
187 (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos);
189 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
191 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
193 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
197 EXPORT_SYMBOL_GPL(nfs_file_read);
200 nfs_file_splice_read(struct file *filp, loff_t *ppos,
201 struct pipe_inode_info *pipe, size_t count,
204 struct dentry *dentry = filp->f_path.dentry;
205 struct inode *inode = dentry->d_inode;
208 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
209 dentry->d_parent->d_name.name, dentry->d_name.name,
210 (unsigned long) count, (unsigned long long) *ppos);
212 res = nfs_revalidate_mapping(inode, filp->f_mapping);
214 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
216 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
220 EXPORT_SYMBOL_GPL(nfs_file_splice_read);
223 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
225 struct dentry *dentry = file->f_path.dentry;
226 struct inode *inode = dentry->d_inode;
229 dprintk("NFS: mmap(%s/%s)\n",
230 dentry->d_parent->d_name.name, dentry->d_name.name);
232 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
233 * so we call that before revalidating the mapping
235 status = generic_file_mmap(file, vma);
237 vma->vm_ops = &nfs_file_vm_ops;
238 status = nfs_revalidate_mapping(inode, file->f_mapping);
242 EXPORT_SYMBOL_GPL(nfs_file_mmap);
245 * Flush any dirty pages for this process, and check for write errors.
246 * The return status from this call provides a reliable indication of
247 * whether any write errors occurred for this process.
249 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
250 * disk, but it retrieves and clears ctx->error after synching, despite
251 * the two being set at the same time in nfs_context_set_write_error().
252 * This is because the former is used to notify the _next_ call to
253 * nfs_file_write() that a write error occurred, and hence cause it to
254 * fall back to doing a synchronous write.
257 nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
259 struct dentry *dentry = file->f_path.dentry;
260 struct nfs_open_context *ctx = nfs_file_open_context(file);
261 struct inode *inode = dentry->d_inode;
262 int have_error, status;
265 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
266 dentry->d_parent->d_name.name, dentry->d_name.name,
269 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
270 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
271 status = nfs_commit_inode(inode, FLUSH_SYNC);
272 if (status >= 0 && ret < 0)
274 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
276 ret = xchg(&ctx->error, 0);
277 if (!ret && status < 0)
281 EXPORT_SYMBOL_GPL(nfs_file_fsync_commit);
284 nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
287 struct inode *inode = file->f_path.dentry->d_inode;
289 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
292 mutex_lock(&inode->i_mutex);
293 ret = nfs_file_fsync_commit(file, start, end, datasync);
294 mutex_unlock(&inode->i_mutex);
300 * Decide whether a read/modify/write cycle may be more efficient
301 * then a modify/write/read cycle when writing to a page in the
304 * The modify/write/read cycle may occur if a page is read before
305 * being completely filled by the writer. In this situation, the
306 * page must be completely written to stable storage on the server
307 * before it can be refilled by reading in the page from the server.
308 * This can lead to expensive, small, FILE_SYNC mode writes being
311 * It may be more efficient to read the page first if the file is
312 * open for reading in addition to writing, the page is not marked
313 * as Uptodate, it is not dirty or waiting to be committed,
314 * indicating that it was previously allocated and then modified,
315 * that there were valid bytes of data in that range of the file,
316 * and that the new data won't completely replace the old data in
317 * that range of the file.
319 static int nfs_want_read_modify_write(struct file *file, struct page *page,
320 loff_t pos, unsigned len)
322 unsigned int pglen = nfs_page_length(page);
323 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
324 unsigned int end = offset + len;
326 if ((file->f_mode & FMODE_READ) && /* open for read? */
327 !PageUptodate(page) && /* Uptodate? */
328 !PagePrivate(page) && /* i/o request already? */
329 pglen && /* valid bytes of file? */
330 (end < pglen || offset)) /* replace all valid bytes? */
336 * This does the "real" work of the write. We must allocate and lock the
337 * page to be sent back to the generic routine, which then copies the
338 * data from user space.
340 * If the writer ends up delaying the write, the writer needs to
341 * increment the page use counts until he is done with the page.
343 static int nfs_write_begin(struct file *file, struct address_space *mapping,
344 loff_t pos, unsigned len, unsigned flags,
345 struct page **pagep, void **fsdata)
348 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
352 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
353 file->f_path.dentry->d_parent->d_name.name,
354 file->f_path.dentry->d_name.name,
355 mapping->host->i_ino, len, (long long) pos);
359 * Prevent starvation issues if someone is doing a consistency
362 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
363 nfs_wait_bit_killable, TASK_KILLABLE);
367 page = grab_cache_page_write_begin(mapping, index, flags);
372 ret = nfs_flush_incompatible(file, page);
375 page_cache_release(page);
376 } else if (!once_thru &&
377 nfs_want_read_modify_write(file, page, pos, len)) {
379 ret = nfs_readpage(file, page);
380 page_cache_release(page);
387 static int nfs_write_end(struct file *file, struct address_space *mapping,
388 loff_t pos, unsigned len, unsigned copied,
389 struct page *page, void *fsdata)
391 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
394 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
395 file->f_path.dentry->d_parent->d_name.name,
396 file->f_path.dentry->d_name.name,
397 mapping->host->i_ino, len, (long long) pos);
400 * Zero any uninitialised parts of the page, and then mark the page
401 * as up to date if it turns out that we're extending the file.
403 if (!PageUptodate(page)) {
404 unsigned pglen = nfs_page_length(page);
405 unsigned end = offset + len;
408 zero_user_segments(page, 0, offset,
409 end, PAGE_CACHE_SIZE);
410 SetPageUptodate(page);
411 } else if (end >= pglen) {
412 zero_user_segment(page, end, PAGE_CACHE_SIZE);
414 SetPageUptodate(page);
416 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
419 status = nfs_updatepage(file, page, offset, copied);
422 page_cache_release(page);
426 NFS_I(mapping->host)->write_io += copied;
431 * Partially or wholly invalidate a page
432 * - Release the private state associated with a page if undergoing complete
434 * - Called if either PG_private or PG_fscache is set on the page
435 * - Caller holds page lock
437 static void nfs_invalidate_page(struct page *page, unsigned long offset)
439 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
443 /* Cancel any unstarted writes on this page */
444 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
446 nfs_fscache_invalidate_page(page, page->mapping->host);
450 * Attempt to release the private state associated with a page
451 * - Called if either PG_private or PG_fscache is set on the page
452 * - Caller holds page lock
453 * - Return true (may release page) or false (may not)
455 static int nfs_release_page(struct page *page, gfp_t gfp)
457 struct address_space *mapping = page->mapping;
459 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
461 /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not
462 * doing this memory reclaim for a fs-related allocation.
464 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL &&
465 !(current->flags & PF_FSTRANS)) {
466 int how = FLUSH_SYNC;
468 /* Don't let kswapd deadlock waiting for OOM RPC calls */
469 if (current_is_kswapd())
471 nfs_commit_inode(mapping->host, how);
473 /* If PagePrivate() is set, then the page is not freeable */
474 if (PagePrivate(page))
476 return nfs_fscache_release_page(page, gfp);
480 * Attempt to clear the private state associated with a page when an error
481 * occurs that requires the cached contents of an inode to be written back or
483 * - Called if either PG_private or fscache is set on the page
484 * - Caller holds page lock
485 * - Return 0 if successful, -error otherwise
487 static int nfs_launder_page(struct page *page)
489 struct inode *inode = page_file_mapping(page)->host;
490 struct nfs_inode *nfsi = NFS_I(inode);
492 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
493 inode->i_ino, (long long)page_offset(page));
495 nfs_fscache_wait_on_page_write(nfsi, page);
496 return nfs_wb_page(inode, page);
499 #ifdef CONFIG_NFS_SWAP
500 static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
504 return xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 1);
507 static void nfs_swap_deactivate(struct file *file)
509 xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 0);
513 const struct address_space_operations nfs_file_aops = {
514 .readpage = nfs_readpage,
515 .readpages = nfs_readpages,
516 .set_page_dirty = __set_page_dirty_nobuffers,
517 .writepage = nfs_writepage,
518 .writepages = nfs_writepages,
519 .write_begin = nfs_write_begin,
520 .write_end = nfs_write_end,
521 .invalidatepage = nfs_invalidate_page,
522 .releasepage = nfs_release_page,
523 .direct_IO = nfs_direct_IO,
524 .migratepage = nfs_migrate_page,
525 .launder_page = nfs_launder_page,
526 .error_remove_page = generic_error_remove_page,
527 #ifdef CONFIG_NFS_SWAP
528 .swap_activate = nfs_swap_activate,
529 .swap_deactivate = nfs_swap_deactivate,
534 * Notification that a PTE pointing to an NFS page is about to be made
535 * writable, implying that someone is about to modify the page through a
536 * shared-writable mapping
538 static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
540 struct page *page = vmf->page;
541 struct file *filp = vma->vm_file;
542 struct dentry *dentry = filp->f_path.dentry;
544 int ret = VM_FAULT_NOPAGE;
545 struct address_space *mapping;
547 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
548 dentry->d_parent->d_name.name, dentry->d_name.name,
549 filp->f_mapping->host->i_ino,
550 (long long)page_offset(page));
552 /* make sure the cache has finished storing the page */
553 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
556 mapping = page_file_mapping(page);
557 if (mapping != dentry->d_inode->i_mapping)
560 wait_on_page_writeback(page);
562 pagelen = nfs_page_length(page);
566 ret = VM_FAULT_LOCKED;
567 if (nfs_flush_incompatible(filp, page) == 0 &&
568 nfs_updatepage(filp, page, 0, pagelen) == 0)
571 ret = VM_FAULT_SIGBUS;
578 static const struct vm_operations_struct nfs_file_vm_ops = {
579 .fault = filemap_fault,
580 .page_mkwrite = nfs_vm_page_mkwrite,
583 static int nfs_need_sync_write(struct file *filp, struct inode *inode)
585 struct nfs_open_context *ctx;
587 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
589 ctx = nfs_file_open_context(filp);
590 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
595 ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
596 unsigned long nr_segs, loff_t pos)
598 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
599 struct inode * inode = dentry->d_inode;
600 unsigned long written = 0;
602 size_t count = iov_length(iov, nr_segs);
604 if (iocb->ki_filp->f_flags & O_DIRECT)
605 return nfs_file_direct_write(iocb, iov, nr_segs, pos, true);
607 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
608 dentry->d_parent->d_name.name, dentry->d_name.name,
609 (unsigned long) count, (long long) pos);
612 if (IS_SWAPFILE(inode))
615 * O_APPEND implies that we must revalidate the file length.
617 if (iocb->ki_filp->f_flags & O_APPEND) {
618 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
627 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
631 /* Return error values for O_DSYNC and IS_SYNC() */
632 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
633 int err = vfs_fsync(iocb->ki_filp, 0);
638 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
643 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
646 EXPORT_SYMBOL_GPL(nfs_file_write);
648 ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
649 struct file *filp, loff_t *ppos,
650 size_t count, unsigned int flags)
652 struct dentry *dentry = filp->f_path.dentry;
653 struct inode *inode = dentry->d_inode;
654 unsigned long written = 0;
657 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
658 dentry->d_parent->d_name.name, dentry->d_name.name,
659 (unsigned long) count, (unsigned long long) *ppos);
662 * The combination of splice and an O_APPEND destination is disallowed.
665 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
669 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
670 int err = vfs_fsync(filp, 0);
675 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
678 EXPORT_SYMBOL_GPL(nfs_file_splice_write);
681 do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
683 struct inode *inode = filp->f_mapping->host;
685 unsigned int saved_type = fl->fl_type;
687 /* Try local locking first */
688 posix_test_lock(filp, fl);
689 if (fl->fl_type != F_UNLCK) {
690 /* found a conflict */
693 fl->fl_type = saved_type;
695 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
701 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
705 fl->fl_type = F_UNLCK;
709 static int do_vfs_lock(struct file *file, struct file_lock *fl)
712 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
714 res = posix_lock_file_wait(file, fl);
717 res = flock_lock_file_wait(file, fl);
726 do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
728 struct inode *inode = filp->f_mapping->host;
732 * Flush all pending writes before doing anything
735 nfs_sync_mapping(filp->f_mapping);
737 /* NOTE: special case
738 * If we're signalled while cleaning up locks on process exit, we
739 * still need to complete the unlock.
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 is_time_granular(struct timespec *ts) {
754 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
758 do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
760 struct inode *inode = filp->f_mapping->host;
764 * Flush all pending writes before doing anything
767 status = nfs_sync_mapping(filp->f_mapping);
772 * Use local locking if mounted with "-onolock" or with appropriate
776 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
778 status = do_vfs_lock(filp, fl);
783 * Revalidate the cache if the server has time stamps granular
784 * enough to detect subsecond changes. Otherwise, clear the
785 * cache to prevent missing any changes.
787 * This makes locking act as a cache coherency point.
789 nfs_sync_mapping(filp->f_mapping);
790 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
791 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
792 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
794 nfs_zap_caches(inode);
801 * Lock a (portion of) a file
803 int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
805 struct inode *inode = filp->f_mapping->host;
809 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
810 filp->f_path.dentry->d_parent->d_name.name,
811 filp->f_path.dentry->d_name.name,
812 fl->fl_type, fl->fl_flags,
813 (long long)fl->fl_start, (long long)fl->fl_end);
815 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
817 /* No mandatory locks over NFS */
818 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
821 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
824 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
825 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
831 ret = do_getlk(filp, cmd, fl, is_local);
832 else if (fl->fl_type == F_UNLCK)
833 ret = do_unlk(filp, cmd, fl, is_local);
835 ret = do_setlk(filp, cmd, fl, is_local);
839 EXPORT_SYMBOL_GPL(nfs_lock);
842 * Lock a (portion of) a file
844 int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
846 struct inode *inode = filp->f_mapping->host;
849 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
850 filp->f_path.dentry->d_parent->d_name.name,
851 filp->f_path.dentry->d_name.name,
852 fl->fl_type, fl->fl_flags);
854 if (!(fl->fl_flags & FL_FLOCK))
858 * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
859 * any standard. In principle we might be able to support LOCK_MAND
860 * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
861 * NFS code is not set up for it.
863 if (fl->fl_type & LOCK_MAND)
866 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
869 /* We're simulating flock() locks using posix locks on the server */
870 fl->fl_owner = (fl_owner_t)filp;
872 fl->fl_end = OFFSET_MAX;
874 if (fl->fl_type == F_UNLCK)
875 return do_unlk(filp, cmd, fl, is_local);
876 return do_setlk(filp, cmd, fl, is_local);
878 EXPORT_SYMBOL_GPL(nfs_flock);
881 * There is no protocol support for leases, so we have no way to implement
882 * them correctly in the face of opens by other clients.
884 int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
886 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
887 file->f_path.dentry->d_parent->d_name.name,
888 file->f_path.dentry->d_name.name, arg);
891 EXPORT_SYMBOL_GPL(nfs_setlease);
893 const struct file_operations nfs_file_operations = {
894 .llseek = nfs_file_llseek,
895 .read = do_sync_read,
896 .write = do_sync_write,
897 .aio_read = nfs_file_read,
898 .aio_write = nfs_file_write,
899 .mmap = nfs_file_mmap,
900 .open = nfs_file_open,
901 .flush = nfs_file_flush,
902 .release = nfs_file_release,
903 .fsync = nfs_file_fsync,
906 .splice_read = nfs_file_splice_read,
907 .splice_write = nfs_file_splice_write,
908 .check_flags = nfs_check_flags,
909 .setlease = nfs_setlease,
911 EXPORT_SYMBOL_GPL(nfs_file_operations);