2 * file.c - NILFS regular file handling primitives including fsync().
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Written by Amagai Yoshiji <amagai@osrg.net>,
21 * Ryusuke Konishi <ryusuke@osrg.net>
26 #include <linux/writeback.h>
30 int nilfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
33 * Called from fsync() system call
34 * This is the only entry point that can catch write and synch
35 * timing for both data blocks and intermediate blocks.
37 * This function should be implemented when the writeback function
38 * will be implemented.
40 struct inode *inode = dentry->d_inode;
43 if (!nilfs_inode_dirty(inode))
47 err = nilfs_construct_dsync_segment(inode->i_sb, inode);
49 err = nilfs_construct_segment(inode->i_sb);
55 nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
56 unsigned long nr_segs, loff_t pos)
58 struct file *file = iocb->ki_filp;
59 struct inode *inode = file->f_dentry->d_inode;
62 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
66 if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
69 err = nilfs_construct_dsync_segment(inode->i_sb, inode);
76 static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
78 if (!(vma->vm_flags & (VM_WRITE | VM_MAYWRITE)))
81 wait_on_page_writeback(page);
85 struct vm_operations_struct nilfs_file_vm_ops = {
86 .fault = filemap_fault,
87 .page_mkwrite = nilfs_page_mkwrite,
90 static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
93 vma->vm_ops = &nilfs_file_vm_ops;
94 vma->vm_flags |= VM_CAN_NONLINEAR;
99 * We have mostly NULL's here: the current defaults are ok for
100 * the nilfs filesystem.
102 struct file_operations nilfs_file_operations = {
103 .llseek = generic_file_llseek,
104 .read = do_sync_read,
105 .write = do_sync_write,
106 .aio_read = generic_file_aio_read,
107 .aio_write = nilfs_file_aio_write,
108 .ioctl = nilfs_ioctl,
110 .compat_ioctl = nilfs_compat_ioctl,
111 #endif /* CONFIG_COMPAT */
112 .mmap = nilfs_file_mmap,
113 .open = generic_file_open,
114 /* .release = nilfs_release_file, */
115 .fsync = nilfs_sync_file,
116 .splice_read = generic_file_splice_read,
119 struct inode_operations nilfs_file_inode_operations = {
120 .truncate = nilfs_truncate,
121 .setattr = nilfs_setattr,
122 .permission = nilfs_permission,