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/*
* vmfs-tools - Tools to access VMFS filesystems
* Copyright (C) 2009 Christophe Fillot <cf@utc.fr>
* 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/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#ifdef __linux__
#include <scsi/scsi.h>
#include <scsi/sg.h>
#endif
#include <sys/ioctl.h>
/* SCSI "reserve" command */
#define SCSI_CMD_RESERVE 0x16
#define SCSI_CMD_LEN_RESERVE 6
/* SCSI "release command */
#define SCSI_CMD_RELEASE 0x17
#define SCSI_CMD_LEN_RELEASE 6
/* Send a SCSI "reserve" command */
int scsi_reserve(int fd)
{
#ifdef __linux__
sg_io_hdr_t io_hdr;
u_char sense_buffer[32];
u_char cmd[SCSI_CMD_LEN_RESERVE] = { SCSI_CMD_RESERVE, 0, 0, 0, 0, 0 };
memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(cmd);
io_hdr.mx_sb_len = sizeof(sense_buffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
io_hdr.cmdp = cmd;
io_hdr.sbp = sense_buffer;
io_hdr.timeout = 5000;
if (ioctl(fd,SG_IO,&io_hdr) < 0) {
perror("ioctl");
return(-1);
}
#endif
return(0);
}
/* Send a SCSI "release" command */
int scsi_release(int fd)
{
#ifdef __linux__
sg_io_hdr_t io_hdr;
u_char sense_buffer[32];
u_char cmd[SCSI_CMD_LEN_RELEASE] = { SCSI_CMD_RELEASE, 0, 0, 0, 0, 0 };
memset(&io_hdr, 0, sizeof(struct sg_io_hdr));
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof(cmd);
io_hdr.mx_sb_len = sizeof(sense_buffer);
io_hdr.dxfer_direction = SG_DXFER_NONE;
io_hdr.cmdp = cmd;
io_hdr.sbp = sense_buffer;
io_hdr.timeout = 5000;
if (ioctl(fd,SG_IO,&io_hdr) < 0) {
perror("ioctl");
return(-1);
}
#endif
return(0);
}
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