[linux-2.6-block.git] / fs / nilfs2 / file.c

/*
 * file.c - NILFS regular file handling primitives including fsync().
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Written by Amagai Yoshiji <amagai@osrg.net>,
 *            Ryusuke Konishi <ryusuke@osrg.net>
 */

#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/writeback.h>
#include "nilfs.h"
#include "segment.h"

int nilfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
{
	/*
	 * Called from fsync() system call
	 * This is the only entry point that can catch write and synch
	 * timing for both data blocks and intermediate blocks.
	 *
	 * This function should be implemented when the writeback function
	 * will be implemented.
	 */
	struct inode *inode = dentry->d_inode;
	int err;

	if (!nilfs_inode_dirty(inode))
		return 0;

	if (datasync)
		err = nilfs_construct_dsync_segment(inode->i_sb, inode);
	else
		err = nilfs_construct_segment(inode->i_sb);

	return err;
}

static ssize_t
nilfs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
		     unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_dentry->d_inode;
	ssize_t ret;

	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
	if (ret <= 0)
		return ret;

	if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
		int err;

		err = nilfs_construct_dsync_segment(inode->i_sb, inode);
		if (unlikely(err))
			return err;
	}
	return ret;
}

static int nilfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
{
	if (!(vma->vm_flags & (VM_WRITE | VM_MAYWRITE)))
		return -EPERM;
	SetPageChecked(page);
	wait_on_page_writeback(page);
	return 0;
}

struct vm_operations_struct nilfs_file_vm_ops = {
	.fault		= filemap_fault,
	.page_mkwrite	= nilfs_page_mkwrite,
};

static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	file_accessed(file);
	vma->vm_ops = &nilfs_file_vm_ops;
	vma->vm_flags |= VM_CAN_NONLINEAR;
	return 0;
}

/*
 * We have mostly NULL's here: the current defaults are ok for
 * the nilfs filesystem.
 */
struct file_operations nilfs_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= nilfs_file_aio_write,
	.ioctl		= nilfs_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= nilfs_compat_ioctl,
#endif	/* CONFIG_COMPAT */
	.mmap		= nilfs_file_mmap,
	.open		= generic_file_open,
	/* .release	= nilfs_release_file, */
	.fsync		= nilfs_sync_file,
	.splice_read	= generic_file_splice_read,
};

struct inode_operations nilfs_file_inode_operations = {
	.truncate	= nilfs_truncate,
	.setattr	= nilfs_setattr,
	.permission     = nilfs_permission,
};

/* end of file */
Commit	Line	Data
f183ff4f RK	1	/*
	2	* file.c - NILFS regular file handling primitives including fsync().
	3	*
	4	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	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.
	10	*
	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.
	15	*
	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
	19	*
	20	* Written by Amagai Yoshiji <amagai@osrg.net>,
	21	* Ryusuke Konishi <ryusuke@osrg.net>
	22	*/
	23
	24	#include <linux/fs.h>
	25	#include <linux/mm.h>
	26	#include <linux/writeback.h>
	27	#include "nilfs.h"
	28	#include "segment.h"
	29
	30	int nilfs_sync_file(struct file file, struct dentry dentry, int datasync)
	31	{
	32	/*
	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.
	36	*
	37	* This function should be implemented when the writeback function
	38	* will be implemented.
	39	*/
	40	struct inode *inode = dentry->d_inode;
	41	int err;
	42
	43	if (!nilfs_inode_dirty(inode))
	44	return 0;
	45
	46	if (datasync)
	47	err = nilfs_construct_dsync_segment(inode->i_sb, inode);
	48	else
	49	err = nilfs_construct_segment(inode->i_sb);
	50
	51	return err;
	52	}
	53
	54	static ssize_t
	55	nilfs_file_aio_write(struct kiocb iocb, const struct iovec iov,
	56	unsigned long nr_segs, loff_t pos)
	57	{
	58	struct file *file = iocb->ki_filp;
	59	struct inode *inode = file->f_dentry->d_inode;
	60	ssize_t ret;
	61
	62	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
	63	if (ret <= 0)
	64	return ret;
65
66	if ((file->f_flags & O_SYNC) \|\| IS_SYNC(inode)) {
67	int err;
68
69	err = nilfs_construct_dsync_segment(inode->i_sb, inode);
70	if (unlikely(err))
71	return err;
72	}
73	return ret;
74	}
75
76	static int nilfs_page_mkwrite(struct vm_area_struct vma, struct page page)
77	{
78	if (!(vma->vm_flags & (VM_WRITE \| VM_MAYWRITE)))
79	return -EPERM;
80	SetPageChecked(page);
81	wait_on_page_writeback(page);
82	return 0;
83	}
84
85	struct vm_operations_struct nilfs_file_vm_ops = {
86	.fault = filemap_fault,
87	.page_mkwrite = nilfs_page_mkwrite,
88	};
89
90	static int nilfs_file_mmap(struct file file, struct vm_area_struct vma)
91	{
92	file_accessed(file);
93	vma->vm_ops = &nilfs_file_vm_ops;
94	vma->vm_flags \|= VM_CAN_NONLINEAR;
95	return 0;
96	}
97
98	/*
99	* We have mostly NULL's here: the current defaults are ok for
100	* the nilfs filesystem.
101	*/
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,
109	#ifdef CONFIG_COMPAT
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,
117	};
118
119	struct inode_operations nilfs_file_inode_operations = {
120	.truncate = nilfs_truncate,
121	.setattr = nilfs_setattr,
122	.permission = nilfs_permission,
123	};
124
125	/* end of file */