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/******************************************************************************
* xl_scsi.c
*
* Xenolinux virtual SCSI block-device driver.
*
*/
#include "xl_block.h"
#define MAJOR_NR XLSCSI_MAJOR
#include <linux/blk.h>
/* We support up to 16 devices of up to 16 partitions each. */
#define XLSCSI_MAX 256
#define XLSCSI_MAJOR_NAME "xsd"
#define SCSI_PARTN_BITS 4
static int xlscsi_blksize_size[XLSCSI_MAX];
static int xlscsi_hardsect_size[XLSCSI_MAX];
static int xlscsi_max_sectors[XLSCSI_MAX];
struct gendisk *xlscsi_gendisk = NULL;
static struct block_device_operations xlscsi_block_fops =
{
open: xenolinux_block_open,
release: xenolinux_block_release,
ioctl: xenolinux_block_ioctl,
check_media_change: xenolinux_block_check,
revalidate: xenolinux_block_revalidate,
};
/* tiny inteface fn */
int xlscsi_hwsect(int minor)
{
return xlscsi_hardsect_size[minor];
}
int xlscsi_init(xen_disk_info_t *xdi)
{
int i, result, units, minors, disk;
struct gendisk *gd;
SET_MODULE_OWNER(&xlscsi_block_fops);
result = register_blkdev(XLSCSI_MAJOR, XLSCSI_MAJOR_NAME,
&xlscsi_block_fops);
if ( result < 0 )
{
printk (KERN_ALERT "XL SCSI: can't get major %d\n", XLSCSI_MAJOR);
return result;
}
/* Initialize global arrays. */
for ( i = 0; i < XLSCSI_MAX; i++ )
{
xlscsi_blksize_size[i] = 512;
xlscsi_hardsect_size[i] = 512;
xlscsi_max_sectors[i] = 128;
}
blk_size[XLSCSI_MAJOR] = NULL;
blksize_size[XLSCSI_MAJOR] = xlscsi_blksize_size;
hardsect_size[XLSCSI_MAJOR] = xlscsi_hardsect_size;
max_sectors[XLSCSI_MAJOR] = xlscsi_max_sectors;
read_ahead[XLSCSI_MAJOR] = 8;
blk_init_queue(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR), do_xlblk_request);
/*
* Turn off barking 'headactive' mode. We dequeue buffer heads as
* soon as we pass them down to Xen.
*/
blk_queue_headactive(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR), 0);
/* Count number of SCSI devices installed in the system. */
units = 0;
for ( i = 0; i < xdi->count; i++ )
if ( xdi->disks[i].type == XEN_DISK_SCSI ) units++;
if ( units == 0 ) return 0;
/* Construct an appropriate gendisk structure. */
minors = units * (1<<SCSI_PARTN_BITS);
gd = kmalloc(sizeof(struct gendisk), GFP_KERNEL);
gd->sizes = kmalloc(minors * sizeof(int), GFP_KERNEL);
gd->part = kmalloc(minors * sizeof(struct hd_struct), GFP_KERNEL);
gd->major = XLSCSI_MAJOR;
gd->major_name = XLSCSI_MAJOR_NAME;
gd->minor_shift = SCSI_PARTN_BITS;
gd->max_p = 1<<SCSI_PARTN_BITS;
gd->nr_real = units;
gd->real_devices = kmalloc(units * sizeof(xl_disk_t), GFP_KERNEL);
gd->next = NULL;
gd->fops = &xlscsi_block_fops;
gd->de_arr = kmalloc(sizeof(*gd->de_arr) * units, GFP_KERNEL);
gd->flags = kmalloc(sizeof(*gd->flags) * units, GFP_KERNEL);
memset(gd->sizes, 0, minors * sizeof(int));
memset(gd->part, 0, minors * sizeof(struct hd_struct));
memset(gd->de_arr, 0, sizeof(*gd->de_arr) * units);
memset(gd->flags, 0, sizeof(*gd->flags) * units);
memset(gd->real_devices, 0, sizeof(xl_disk_t) * units);
xlscsi_gendisk = gd;
add_gendisk(gd);
/* Now register each disk in turn. */
disk = 0;
for ( i = 0; i < xdi->count; i++ )
{
if ( xdi->disks[i].type != XEN_DISK_SCSI ) continue;
((xl_disk_t *)gd->real_devices)[disk].capacity =
xdi->disks[i].capacity;
register_disk(gd,
MKDEV(XLSCSI_MAJOR, disk<<SCSI_PARTN_BITS),
1<<SCSI_PARTN_BITS,
&xlscsi_block_fops,
xdi->disks[i].capacity);
disk++;
}
printk(KERN_ALERT
"XenoLinux Virtual SCSI Device Driver installed [device: %d]\n",
XLSCSI_MAJOR);
return 0;
}
void xlscsi_cleanup(void)
{
blk_cleanup_queue(BLK_DEFAULT_QUEUE(XLSCSI_MAJOR));
xlscsi_gendisk = NULL;
read_ahead[XLSCSI_MAJOR] = 0;
if ( blksize_size[XLSCSI_MAJOR] != NULL )
{
kfree(blksize_size[XLSCSI_MAJOR]);
blksize_size[XLSCSI_MAJOR] = NULL;
}
if ( hardsect_size[XLSCSI_MAJOR] != NULL )
{
kfree(hardsect_size[XLSCSI_MAJOR]);
hardsect_size[XLSCSI_MAJOR] = NULL;
}
if ( max_sectors[XLSCSI_MAJOR] != NULL )
{
kfree(max_sectors[XLSCSI_MAJOR]);
max_sectors[XLSCSI_MAJOR] = NULL;
}
if ( unregister_blkdev(XLSCSI_MAJOR, XLSCSI_MAJOR_NAME) != 0 )
{
printk(KERN_ALERT
"XenoLinux Virtual SCSI Device Driver uninstalled w/ errs\n");
}
}
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