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
, 0,
50 err
= nilfs_construct_segment(inode
->i_sb
);
55 static int nilfs_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
57 struct page
*page
= vmf
->page
;
58 struct inode
*inode
= vma
->vm_file
->f_dentry
->d_inode
;
59 struct nilfs_transaction_info ti
;
62 if (unlikely(nilfs_near_disk_full(NILFS_SB(inode
->i_sb
)->s_nilfs
)))
63 return VM_FAULT_SIGBUS
; /* -ENOSPC */
66 if (page
->mapping
!= inode
->i_mapping
||
67 page_offset(page
) >= i_size_read(inode
) || !PageUptodate(page
)) {
69 return VM_FAULT_NOPAGE
; /* make the VM retry the fault */
73 * check to see if the page is mapped already (no holes)
75 if (PageMappedToDisk(page
)) {
79 if (page_has_buffers(page
)) {
80 struct buffer_head
*bh
, *head
;
83 bh
= head
= page_buffers(page
);
85 if (!buffer_mapped(bh
)) {
89 } while (bh
= bh
->b_this_page
, bh
!= head
);
92 SetPageMappedToDisk(page
);
102 ret
= nilfs_transaction_begin(inode
->i_sb
, &ti
, 1);
103 /* never returns -ENOMEM, but may return -ENOSPC */
105 return VM_FAULT_SIGBUS
;
107 ret
= block_page_mkwrite(vma
, vmf
, nilfs_get_block
);
109 nilfs_transaction_abort(inode
->i_sb
);
112 nilfs_transaction_commit(inode
->i_sb
);
115 SetPageChecked(page
);
116 wait_on_page_writeback(page
);
120 struct vm_operations_struct nilfs_file_vm_ops
= {
121 .fault
= filemap_fault
,
122 .page_mkwrite
= nilfs_page_mkwrite
,
125 static int nilfs_file_mmap(struct file
*file
, struct vm_area_struct
*vma
)
128 vma
->vm_ops
= &nilfs_file_vm_ops
;
129 vma
->vm_flags
|= VM_CAN_NONLINEAR
;
134 * We have mostly NULL's here: the current defaults are ok for
135 * the nilfs filesystem.
137 struct file_operations nilfs_file_operations
= {
138 .llseek
= generic_file_llseek
,
139 .read
= do_sync_read
,
140 .write
= do_sync_write
,
141 .aio_read
= generic_file_aio_read
,
142 .aio_write
= generic_file_aio_write
,
143 .unlocked_ioctl
= nilfs_ioctl
,
145 .compat_ioctl
= nilfs_ioctl
,
146 #endif /* CONFIG_COMPAT */
147 .mmap
= nilfs_file_mmap
,
148 .open
= generic_file_open
,
149 /* .release = nilfs_release_file, */
150 .fsync
= nilfs_sync_file
,
151 .splice_read
= generic_file_splice_read
,
154 const struct inode_operations nilfs_file_inode_operations
= {
155 .truncate
= nilfs_truncate
,
156 .setattr
= nilfs_setattr
,
157 .permission
= nilfs_permission
,