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/*
* vmfs-tools - Tools to access VMFS filesystems
* Copyright (C) 2009 Mike Hommey <mh@glandium.org>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef VMFS_DEVICE_H
#define VMFS_DEVICE_H
#include "vmfs.h"
struct vmfs_device {
ssize_t (*read)(const vmfs_device_t *dev, off_t pos,
u_char *buf, size_t len);
ssize_t (*write)(const vmfs_device_t *dev, off_t pos,
const u_char *buf, size_t len);
int (*reserve)(const vmfs_device_t *dev, off_t pos);
int (*release)(const vmfs_device_t *dev, off_t pos);
void (*close)(vmfs_device_t *dev);
uuid_t *uuid;
};
static inline ssize_t vmfs_device_read(const vmfs_device_t *dev, off_t pos,
u_char *buf, size_t len)
{
return dev->read(dev, pos, buf, len);
}
static inline ssize_t vmfs_device_write(const vmfs_device_t *dev, off_t pos,
const u_char *buf, size_t len)
{
if (dev->write)
return dev->write(dev, pos, buf, len);
return -1;
}
static inline int vmfs_device_reserve(const vmfs_device_t *dev, off_t pos)
{
if (dev->reserve)
return dev->reserve(dev, pos);
return 0;
}
static inline int vmfs_device_release(const vmfs_device_t *dev, off_t pos)
{
if (dev->release)
return dev->release(dev, pos);
return 0;
}
static inline void vmfs_device_close(vmfs_device_t *dev)
{
if (dev->close)
dev->close(dev);
}
#endif
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