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 vm_fault *vmf)
78 struct page *page = vmf->page;
79 struct inode *inode = vma->vm_file->f_dentry->d_inode;
80 struct nilfs_transaction_info ti;
83 if (unlikely(nilfs_near_disk_full(NILFS_SB(inode->i_sb)->s_nilfs)))
84 return VM_FAULT_SIGBUS; /* -ENOSPC */
87 if (page->mapping != inode->i_mapping ||
88 page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
90 return VM_FAULT_NOPAGE; /* make the VM retry the fault */
94 * check to see if the page is mapped already (no holes)
96 if (PageMappedToDisk(page)) {
100 if (page_has_buffers(page)) {
101 struct buffer_head *bh, *head;
102 int fully_mapped = 1;
104 bh = head = page_buffers(page);
106 if (!buffer_mapped(bh)) {
110 } while (bh = bh->b_this_page, bh != head);
113 SetPageMappedToDisk(page);
123 ret = nilfs_transaction_begin(inode->i_sb, &ti, 1);
124 /* never returns -ENOMEM, but may return -ENOSPC */
126 return VM_FAULT_SIGBUS;
128 ret = block_page_mkwrite(vma, vmf, nilfs_get_block);
130 nilfs_transaction_abort(inode->i_sb);
133 nilfs_transaction_commit(inode->i_sb);
136 SetPageChecked(page);
137 wait_on_page_writeback(page);
141 struct vm_operations_struct nilfs_file_vm_ops = {
142 .fault = filemap_fault,
143 .page_mkwrite = nilfs_page_mkwrite,
146 static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
149 vma->vm_ops = &nilfs_file_vm_ops;
150 vma->vm_flags |= VM_CAN_NONLINEAR;
155 * We have mostly NULL's here: the current defaults are ok for
156 * the nilfs filesystem.
158 struct file_operations nilfs_file_operations = {
159 .llseek = generic_file_llseek,
160 .read = do_sync_read,
161 .write = do_sync_write,
162 .aio_read = generic_file_aio_read,
163 .aio_write = nilfs_file_aio_write,
164 .ioctl = nilfs_ioctl,
166 .compat_ioctl = nilfs_compat_ioctl,
167 #endif /* CONFIG_COMPAT */
168 .mmap = nilfs_file_mmap,
169 .open = generic_file_open,
170 /* .release = nilfs_release_file, */
171 .fsync = nilfs_sync_file,
172 .splice_read = generic_file_splice_read,
175 struct inode_operations nilfs_file_inode_operations = {
176 .truncate = nilfs_truncate,
177 .setattr = nilfs_setattr,
178 .permission = nilfs_permission,