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lvm2/driver/device-mapper/dmfs-table.c
2001-09-19 10:32:51 +00:00

87 lines
2.1 KiB
C

/*
* dmfs-table.c
*
* Copyright (C) 2001 Sistina Software
*
* This software 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, or (at
* your option) any later version.
*
* This software 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 GNU CC; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <linux/config.h>
#include <linux/fs.h>
static ssize_t dmfs_table_read(struct file *file, char *buf, size_t size, loff_t *pos)
{
down(&inode->i_sem);
up(&inode->i_sem);
}
static ssize_t dmfs_table_write(struct file *file, const char *buf, size_t size, loff_t *pos)
{
down(&inode->i_sem);
up(&inode->i_sem);
}
static int dmfs_table_open(struct inode *inode, struct file *file)
{
struct dentry *dentry = file->f_dentry;
if (dentry->name[0] == '.')
return -EPERM;
if (dentry->name.len == 6 && memcmp("ACTIVE", dentry->name.name, 6) == 0)
return -EPERM;
return 0;
}
static int dmfs_table_sync(struct file *file, struct dentry *dentry, int datasync)
{
return 0;
}
static struct dm_table_file_operations = {
/* llseek: generic_file_llseek, */
read: dmfs_read,
write: dmfs_write,
open: dmfs_open,
fsync: dmfs_table_sync,
};
static struct dmfs_table_inode_operations = {
};
int dmfs_create_file(struct inode *dir, struct dentry *dentry, int mode)
{
struct inode *inode = new_inode(dir->i_sb);
if (inode) {
inode->i_mode = mode | S_IFREG;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_rdev = NODEV;
inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
inode->i_fop = &dmfs_table_file_operations;
inode->i_op = &dmfs_table_inode_operations;
}
return inode;
}