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"
40 #define NFSDBG_FACILITY NFSDBG_FILE
42 static int nfs_file_open(struct inode *, struct file *);
43 static int nfs_file_release(struct inode *, struct file *);
44 static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
45 static int nfs_file_mmap(struct file *, struct vm_area_struct *);
46 static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
47 struct pipe_inode_info *pipe,
48 size_t count, unsigned int flags);
49 static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
50 unsigned long nr_segs, loff_t pos);
51 static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
52 struct file *filp, loff_t *ppos,
53 size_t count, unsigned int flags);
54 static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
55 unsigned long nr_segs, loff_t pos);
56 static int nfs_file_flush(struct file *, fl_owner_t id);
57 static int nfs_file_fsync(struct file *, int datasync);
58 static int nfs_check_flags(int flags);
59 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
60 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
61 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
63 static const struct vm_operations_struct nfs_file_vm_ops;
65 const struct file_operations nfs_file_operations = {
66 .llseek = nfs_file_llseek,
68 .write = do_sync_write,
69 .aio_read = nfs_file_read,
70 .aio_write = nfs_file_write,
71 .mmap = nfs_file_mmap,
72 .open = nfs_file_open,
73 .flush = nfs_file_flush,
74 .release = nfs_file_release,
75 .fsync = nfs_file_fsync,
78 .splice_read = nfs_file_splice_read,
79 .splice_write = nfs_file_splice_write,
80 .check_flags = nfs_check_flags,
81 .setlease = nfs_setlease,
84 const struct inode_operations nfs_file_inode_operations = {
85 .permission = nfs_permission,
86 .getattr = nfs_getattr,
87 .setattr = nfs_setattr,
91 const struct inode_operations nfs3_file_inode_operations = {
92 .permission = nfs_permission,
93 .getattr = nfs_getattr,
94 .setattr = nfs_setattr,
95 .listxattr = nfs3_listxattr,
96 .getxattr = nfs3_getxattr,
97 .setxattr = nfs3_setxattr,
98 .removexattr = nfs3_removexattr,
100 #endif /* CONFIG_NFS_v3 */
102 /* Hack for future NFS swap support */
104 # define IS_SWAPFILE(inode) (0)
107 static int nfs_check_flags(int flags)
109 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
119 nfs_file_open(struct inode *inode, struct file *filp)
123 dprintk("NFS: open file(%s/%s)\n",
124 filp->f_path.dentry->d_parent->d_name.name,
125 filp->f_path.dentry->d_name.name);
127 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
128 res = nfs_check_flags(filp->f_flags);
132 res = nfs_open(inode, filp);
137 nfs_file_release(struct inode *inode, struct file *filp)
139 struct dentry *dentry = filp->f_path.dentry;
141 dprintk("NFS: release(%s/%s)\n",
142 dentry->d_parent->d_name.name,
143 dentry->d_name.name);
145 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
146 return nfs_release(inode, filp);
150 * nfs_revalidate_size - Revalidate the file size
151 * @inode - pointer to inode struct
152 * @file - pointer to struct file
154 * Revalidates the file length. This is basically a wrapper around
155 * nfs_revalidate_inode() that takes into account the fact that we may
156 * have cached writes (in which case we don't care about the server's
157 * idea of what the file length is), or O_DIRECT (in which case we
158 * shouldn't trust the cache).
160 static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
162 struct nfs_server *server = NFS_SERVER(inode);
163 struct nfs_inode *nfsi = NFS_I(inode);
165 if (nfs_have_delegated_attributes(inode))
168 if (filp->f_flags & O_DIRECT)
170 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
172 if (nfs_attribute_timeout(inode))
177 return __nfs_revalidate_inode(server, inode);
180 static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
184 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
185 filp->f_path.dentry->d_parent->d_name.name,
186 filp->f_path.dentry->d_name.name,
189 /* origin == SEEK_END => we must revalidate the cached file length */
190 if (origin == SEEK_END) {
191 struct inode *inode = filp->f_mapping->host;
193 int retval = nfs_revalidate_file_size(inode, filp);
195 return (loff_t)retval;
197 spin_lock(&inode->i_lock);
198 loff = generic_file_llseek_unlocked(filp, offset, origin);
199 spin_unlock(&inode->i_lock);
201 loff = generic_file_llseek_unlocked(filp, offset, origin);
206 * Helper for nfs_file_flush() and nfs_file_fsync()
208 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
209 * disk, but it retrieves and clears ctx->error after synching, despite
210 * the two being set at the same time in nfs_context_set_write_error().
211 * This is because the former is used to notify the _next_ call to
212 * nfs_file_write() that a write error occured, and hence cause it to
213 * fall back to doing a synchronous write.
215 static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode)
217 int have_error, status;
220 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
221 status = nfs_wb_all(inode);
222 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
224 ret = xchg(&ctx->error, 0);
231 * Flush all dirty pages, and check for write errors.
234 nfs_file_flush(struct file *file, fl_owner_t id)
236 struct nfs_open_context *ctx = nfs_file_open_context(file);
237 struct dentry *dentry = file->f_path.dentry;
238 struct inode *inode = dentry->d_inode;
240 dprintk("NFS: flush(%s/%s)\n",
241 dentry->d_parent->d_name.name,
242 dentry->d_name.name);
244 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
245 if ((file->f_mode & FMODE_WRITE) == 0)
248 /* Flush writes to the server and return any errors */
249 return nfs_do_fsync(ctx, inode);
253 nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
254 unsigned long nr_segs, loff_t pos)
256 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
257 struct inode * inode = dentry->d_inode;
259 size_t count = iov_length(iov, nr_segs);
261 if (iocb->ki_filp->f_flags & O_DIRECT)
262 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
264 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
265 dentry->d_parent->d_name.name, dentry->d_name.name,
266 (unsigned long) count, (unsigned long) pos);
268 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
270 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
272 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
278 nfs_file_splice_read(struct file *filp, loff_t *ppos,
279 struct pipe_inode_info *pipe, size_t count,
282 struct dentry *dentry = filp->f_path.dentry;
283 struct inode *inode = dentry->d_inode;
286 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
287 dentry->d_parent->d_name.name, dentry->d_name.name,
288 (unsigned long) count, (unsigned long long) *ppos);
290 res = nfs_revalidate_mapping(inode, filp->f_mapping);
292 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
294 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
300 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
302 struct dentry *dentry = file->f_path.dentry;
303 struct inode *inode = dentry->d_inode;
306 dprintk("NFS: mmap(%s/%s)\n",
307 dentry->d_parent->d_name.name, dentry->d_name.name);
309 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
310 * so we call that before revalidating the mapping
312 status = generic_file_mmap(file, vma);
314 vma->vm_ops = &nfs_file_vm_ops;
315 status = nfs_revalidate_mapping(inode, file->f_mapping);
321 * Flush any dirty pages for this process, and check for write errors.
322 * The return status from this call provides a reliable indication of
323 * whether any write errors occurred for this process.
326 nfs_file_fsync(struct file *file, int datasync)
328 struct dentry *dentry = file->f_path.dentry;
329 struct nfs_open_context *ctx = nfs_file_open_context(file);
330 struct inode *inode = dentry->d_inode;
332 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
333 dentry->d_parent->d_name.name, dentry->d_name.name,
336 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
337 return nfs_do_fsync(ctx, inode);
341 * Decide whether a read/modify/write cycle may be more efficient
342 * then a modify/write/read cycle when writing to a page in the
345 * The modify/write/read cycle may occur if a page is read before
346 * being completely filled by the writer. In this situation, the
347 * page must be completely written to stable storage on the server
348 * before it can be refilled by reading in the page from the server.
349 * This can lead to expensive, small, FILE_SYNC mode writes being
352 * It may be more efficient to read the page first if the file is
353 * open for reading in addition to writing, the page is not marked
354 * as Uptodate, it is not dirty or waiting to be committed,
355 * indicating that it was previously allocated and then modified,
356 * that there were valid bytes of data in that range of the file,
357 * and that the new data won't completely replace the old data in
358 * that range of the file.
360 static int nfs_want_read_modify_write(struct file *file, struct page *page,
361 loff_t pos, unsigned len)
363 unsigned int pglen = nfs_page_length(page);
364 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
365 unsigned int end = offset + len;
367 if ((file->f_mode & FMODE_READ) && /* open for read? */
368 !PageUptodate(page) && /* Uptodate? */
369 !PagePrivate(page) && /* i/o request already? */
370 pglen && /* valid bytes of file? */
371 (end < pglen || offset)) /* replace all valid bytes? */
377 * This does the "real" work of the write. We must allocate and lock the
378 * page to be sent back to the generic routine, which then copies the
379 * data from user space.
381 * If the writer ends up delaying the write, the writer needs to
382 * increment the page use counts until he is done with the page.
384 static int nfs_write_begin(struct file *file, struct address_space *mapping,
385 loff_t pos, unsigned len, unsigned flags,
386 struct page **pagep, void **fsdata)
389 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
393 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
394 file->f_path.dentry->d_parent->d_name.name,
395 file->f_path.dentry->d_name.name,
396 mapping->host->i_ino, len, (long long) pos);
400 * Prevent starvation issues if someone is doing a consistency
403 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
404 nfs_wait_bit_killable, TASK_KILLABLE);
408 page = grab_cache_page_write_begin(mapping, index, flags);
413 ret = nfs_flush_incompatible(file, page);
416 page_cache_release(page);
417 } else if (!once_thru &&
418 nfs_want_read_modify_write(file, page, pos, len)) {
420 ret = nfs_readpage(file, page);
421 page_cache_release(page);
428 static int nfs_write_end(struct file *file, struct address_space *mapping,
429 loff_t pos, unsigned len, unsigned copied,
430 struct page *page, void *fsdata)
432 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
435 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
436 file->f_path.dentry->d_parent->d_name.name,
437 file->f_path.dentry->d_name.name,
438 mapping->host->i_ino, len, (long long) pos);
441 * Zero any uninitialised parts of the page, and then mark the page
442 * as up to date if it turns out that we're extending the file.
444 if (!PageUptodate(page)) {
445 unsigned pglen = nfs_page_length(page);
446 unsigned end = offset + len;
449 zero_user_segments(page, 0, offset,
450 end, PAGE_CACHE_SIZE);
451 SetPageUptodate(page);
452 } else if (end >= pglen) {
453 zero_user_segment(page, end, PAGE_CACHE_SIZE);
455 SetPageUptodate(page);
457 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
460 status = nfs_updatepage(file, page, offset, copied);
463 page_cache_release(page);
471 * Partially or wholly invalidate a page
472 * - Release the private state associated with a page if undergoing complete
474 * - Called if either PG_private or PG_fscache is set on the page
475 * - Caller holds page lock
477 static void nfs_invalidate_page(struct page *page, unsigned long offset)
479 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
483 /* Cancel any unstarted writes on this page */
484 nfs_wb_page_cancel(page->mapping->host, page);
486 nfs_fscache_invalidate_page(page, page->mapping->host);
490 * Attempt to release the private state associated with a page
491 * - Called if either PG_private or PG_fscache is set on the page
492 * - Caller holds page lock
493 * - Return true (may release page) or false (may not)
495 static int nfs_release_page(struct page *page, gfp_t gfp)
497 struct address_space *mapping = page->mapping;
499 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
501 /* Only do I/O if gfp is a superset of GFP_KERNEL */
502 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
503 int how = FLUSH_SYNC;
505 /* Don't let kswapd deadlock waiting for OOM RPC calls */
506 if (current_is_kswapd())
508 nfs_commit_inode(mapping->host, how);
510 /* If PagePrivate() is set, then the page is not freeable */
511 if (PagePrivate(page))
513 return nfs_fscache_release_page(page, gfp);
517 * Attempt to clear the private state associated with a page when an error
518 * occurs that requires the cached contents of an inode to be written back or
520 * - Called if either PG_private or fscache is set on the page
521 * - Caller holds page lock
522 * - Return 0 if successful, -error otherwise
524 static int nfs_launder_page(struct page *page)
526 struct inode *inode = page->mapping->host;
527 struct nfs_inode *nfsi = NFS_I(inode);
529 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
530 inode->i_ino, (long long)page_offset(page));
532 nfs_fscache_wait_on_page_write(nfsi, page);
533 return nfs_wb_page(inode, page);
536 const struct address_space_operations nfs_file_aops = {
537 .readpage = nfs_readpage,
538 .readpages = nfs_readpages,
539 .set_page_dirty = __set_page_dirty_nobuffers,
540 .writepage = nfs_writepage,
541 .writepages = nfs_writepages,
542 .write_begin = nfs_write_begin,
543 .write_end = nfs_write_end,
544 .invalidatepage = nfs_invalidate_page,
545 .releasepage = nfs_release_page,
546 .direct_IO = nfs_direct_IO,
547 .migratepage = nfs_migrate_page,
548 .launder_page = nfs_launder_page,
549 .error_remove_page = generic_error_remove_page,
553 * Notification that a PTE pointing to an NFS page is about to be made
554 * writable, implying that someone is about to modify the page through a
555 * shared-writable mapping
557 static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
559 struct page *page = vmf->page;
560 struct file *filp = vma->vm_file;
561 struct dentry *dentry = filp->f_path.dentry;
564 struct address_space *mapping;
566 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
567 dentry->d_parent->d_name.name, dentry->d_name.name,
568 filp->f_mapping->host->i_ino,
569 (long long)page_offset(page));
571 /* make sure the cache has finished storing the page */
572 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
575 mapping = page->mapping;
576 if (mapping != dentry->d_inode->i_mapping)
580 pagelen = nfs_page_length(page);
584 ret = nfs_flush_incompatible(filp, page);
588 ret = nfs_updatepage(filp, page, 0, pagelen);
591 return VM_FAULT_LOCKED;
593 return VM_FAULT_SIGBUS;
596 static const struct vm_operations_struct nfs_file_vm_ops = {
597 .fault = filemap_fault,
598 .page_mkwrite = nfs_vm_page_mkwrite,
601 static int nfs_need_sync_write(struct file *filp, struct inode *inode)
603 struct nfs_open_context *ctx;
605 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
607 ctx = nfs_file_open_context(filp);
608 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
613 static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
614 unsigned long nr_segs, loff_t pos)
616 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
617 struct inode * inode = dentry->d_inode;
618 unsigned long written = 0;
620 size_t count = iov_length(iov, nr_segs);
622 if (iocb->ki_filp->f_flags & O_DIRECT)
623 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
625 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
626 dentry->d_parent->d_name.name, dentry->d_name.name,
627 (unsigned long) count, (long long) pos);
630 if (IS_SWAPFILE(inode))
633 * O_APPEND implies that we must revalidate the file length.
635 if (iocb->ki_filp->f_flags & O_APPEND) {
636 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
645 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
649 /* Return error values for O_DSYNC and IS_SYNC() */
650 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
651 int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode);
656 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
661 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
665 static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
666 struct file *filp, loff_t *ppos,
667 size_t count, unsigned int flags)
669 struct dentry *dentry = filp->f_path.dentry;
670 struct inode *inode = dentry->d_inode;
671 unsigned long written = 0;
674 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
675 dentry->d_parent->d_name.name, dentry->d_name.name,
676 (unsigned long) count, (unsigned long long) *ppos);
679 * The combination of splice and an O_APPEND destination is disallowed.
682 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
686 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
687 int err = nfs_do_fsync(nfs_file_open_context(filp), inode);
692 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
696 static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
698 struct inode *inode = filp->f_mapping->host;
701 /* Try local locking first */
702 posix_test_lock(filp, fl);
703 if (fl->fl_type != F_UNLCK) {
704 /* found a conflict */
708 if (nfs_have_delegation(inode, FMODE_READ))
711 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)
714 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
718 fl->fl_type = F_UNLCK;
722 static int do_vfs_lock(struct file *file, struct file_lock *fl)
725 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
727 res = posix_lock_file_wait(file, fl);
730 res = flock_lock_file_wait(file, fl);
736 dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager"
742 static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
744 struct inode *inode = filp->f_mapping->host;
748 * Flush all pending writes before doing anything
751 nfs_sync_mapping(filp->f_mapping);
753 /* NOTE: special case
754 * If we're signalled while cleaning up locks on process exit, we
755 * still need to complete the unlock.
757 /* Use local locking if mounted with "-onolock" */
758 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
759 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
761 status = do_vfs_lock(filp, fl);
765 static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
767 struct inode *inode = filp->f_mapping->host;
771 * Flush all pending writes before doing anything
774 status = nfs_sync_mapping(filp->f_mapping);
778 /* Use local locking if mounted with "-onolock" */
779 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
780 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
782 status = do_vfs_lock(filp, fl);
786 * Make sure we clear the cache whenever we try to get the lock.
787 * This makes locking act as a cache coherency point.
789 nfs_sync_mapping(filp->f_mapping);
790 if (!nfs_have_delegation(inode, FMODE_READ))
791 nfs_zap_caches(inode);
797 * Lock a (portion of) a file
799 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
801 struct inode *inode = filp->f_mapping->host;
804 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
805 filp->f_path.dentry->d_parent->d_name.name,
806 filp->f_path.dentry->d_name.name,
807 fl->fl_type, fl->fl_flags,
808 (long long)fl->fl_start, (long long)fl->fl_end);
810 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
812 /* No mandatory locks over NFS */
813 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
816 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
817 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
823 ret = do_getlk(filp, cmd, fl);
824 else if (fl->fl_type == F_UNLCK)
825 ret = do_unlk(filp, cmd, fl);
827 ret = do_setlk(filp, cmd, fl);
833 * Lock a (portion of) a file
835 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
837 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
838 filp->f_path.dentry->d_parent->d_name.name,
839 filp->f_path.dentry->d_name.name,
840 fl->fl_type, fl->fl_flags);
842 if (!(fl->fl_flags & FL_FLOCK))
845 /* We're simulating flock() locks using posix locks on the server */
846 fl->fl_owner = (fl_owner_t)filp;
848 fl->fl_end = OFFSET_MAX;
850 if (fl->fl_type == F_UNLCK)
851 return do_unlk(filp, cmd, fl);
852 return do_setlk(filp, cmd, fl);
856 * There is no protocol support for leases, so we have no way to implement
857 * them correctly in the face of opens by other clients.
859 static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
861 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
862 file->f_path.dentry->d_parent->d_name.name,
863 file->f_path.dentry->d_name.name, arg);