#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include "sg_include.h"
#include "debug.h"
#include "prio.h"
#include "structs.h"
#define INQUIRY_CMD 0x12
#define INQUIRY_CMDLEN 6
#define pp_rdac_log(prio, msg) condlog(prio, "%s: rdac prio: " msg, dev)
int rdac_prio(const char *dev, int fd, unsigned int timeout)
{
unsigned char sense_buffer[128];
unsigned char sb[128];
unsigned char inqCmdBlk[INQUIRY_CMDLEN] = {INQUIRY_CMD, 1, 0xC9, 0,
sizeof(sense_buffer), 0};
struct sg_io_hdr io_hdr;
int ret = 0;
memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
memset(sense_buffer, 0, 128);
io_hdr.interface_id = 'S';
io_hdr.cmd_len = sizeof (inqCmdBlk);
io_hdr.mx_sb_len = sizeof (sb);
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
io_hdr.dxfer_len = sizeof (sense_buffer);
io_hdr.dxferp = sense_buffer;
io_hdr.cmdp = inqCmdBlk;
io_hdr.sbp = sb;
io_hdr.timeout = get_prio_timeout(timeout, 60000);
io_hdr.pack_id = 0;
if (ioctl(fd, SG_IO, &io_hdr) < 0) {
pp_rdac_log(0, "sending inquiry command failed");
goto out;
}
if (io_hdr.info & SG_INFO_OK_MASK) {
pp_rdac_log(0, "inquiry command indicates error");
goto out;
}
if (/* Verify the code page - right page & page identifier */
sense_buffer[1] != 0xc9 ||
sense_buffer[3] != 0x2c ||
sense_buffer[4] != 'v' ||
sense_buffer[5] != 'a' ||
sense_buffer[6] != 'c' ) {
pp_rdac_log(0, "volume access control page in unknown format");
goto out;
}
if ( /* Current Volume Path Bit */
( sense_buffer[8] & 0x01) == 0x01 ) {
/*
* This volume was owned by the controller receiving
* the inquiry command.
*/
ret |= 0x02;
}
/* Volume Preferred Path Priority */
switch ( sense_buffer[9] & 0x0F ) {
case 0x01:
/*
* Access to this volume is most preferred through
* this path and other paths with this value.
*/
ret |= 0x04;
break;
case 0x02:
/*
* Access to this volume through this path is to be used
* as a secondary path. Typically this path would be used
* for fail-over situations.
*/
ret |= 0x01;
break;
default:
/* Reserved values */
break;
}
/* For ioship mode set the bit 3 (00001000) */
if ((sense_buffer[8] >> 5) & 0x01)
ret |= 0x08;
out:
return(ret);
}
int getprio (struct path *pp, __attribute__((unused)) char *args,
unsigned int timeout)
{
return rdac_prio(pp->dev, pp->fd, timeout);
}