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/******************************************************************************
* xl_ide.c
*
* Xenolinux virtual IDE block-device driver.
*/
#include "xl_block.h"
#define MAJOR_NR XLIDE_MAJOR
#include <linux/blk.h>
#define XLIDE_MAX 256
#define XLIDE_MAJOR_NAME "hd"
static int xlide_blksize_size[XLIDE_MAX];
static int xlide_hardsect_size[XLIDE_MAX];
static int xlide_max_sectors[XLIDE_MAX];
struct gendisk *xlide_gendisk = NULL;
static struct block_device_operations xlide_block_fops =
{
open: xenolinux_block_open,
release: xenolinux_block_release,
ioctl: xenolinux_block_ioctl,
check_media_change: xenolinux_block_check,
revalidate: xenolinux_block_revalidate,
};
int xlide_hwsect(int minor)
{
return xlide_hardsect_size[minor];
}
int xlide_init(xen_disk_info_t *xdi)
{
int i, result, units, minors, disk;
unsigned short minor;
struct gendisk *gd;
char buf[64];
/* If we don't have any usable IDE devices we may as well bail now. */
units = 0;
for ( i = 0; i < xdi->count; i++ )
if ( IS_IDE_XENDEV(xdi->disks[i].device) &&
((xdi->disks[i].device & XENDEV_IDX_MASK) <
XLIDE_DEVS_PER_MAJOR) )
units++;
if ( units == 0 ) return 0;
SET_MODULE_OWNER(&xlide_block_fops);
result = register_blkdev(XLIDE_MAJOR, XLIDE_MAJOR_NAME,
&xlide_block_fops);
if ( result < 0 )
{
printk (KERN_ALERT "XL IDE: can't get major %d\n", XLIDE_MAJOR);
return result;
}
/* Initialize global arrays. */
for ( i = 0; i < XLIDE_MAX; i++ )
{
xlide_blksize_size[i] = 512;
xlide_hardsect_size[i] = 512;
xlide_max_sectors[i] = 128;
}
blk_size[XLIDE_MAJOR] = NULL;
blksize_size[XLIDE_MAJOR] = xlide_blksize_size;
hardsect_size[XLIDE_MAJOR] = xlide_hardsect_size;
max_sectors[XLIDE_MAJOR] = xlide_max_sectors;
read_ahead[XLIDE_MAJOR] = 8;
blk_init_queue(BLK_DEFAULT_QUEUE(XLIDE_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(XLIDE_MAJOR), 0);
units = XLIDE_MAX >> XLIDE_PARTN_SHIFT;
/* Construct an appropriate gendisk structure. */
minors = units * (1<<XLIDE_PARTN_SHIFT);
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 = XLIDE_MAJOR;
gd->major_name = XLIDE_MAJOR_NAME;
gd->minor_shift = XLIDE_PARTN_SHIFT;
gd->max_p = 1<<XLIDE_PARTN_SHIFT;
gd->nr_real = units;
gd->real_devices = kmalloc(units * sizeof(xl_disk_t), GFP_KERNEL);
gd->next = NULL;
gd->fops = &xlide_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);
xlide_gendisk = gd;
add_gendisk(gd);
/* Now register each disk in turn. */
for ( i = 0; i < xdi->count; i++ )
{
disk = xdi->disks[i].device & XENDEV_IDX_MASK;
minor = disk << XLIDE_PARTN_SHIFT;
if ( !IS_IDE_XENDEV(xdi->disks[i].device) ||
(disk >= XLIDE_DEVS_PER_MAJOR) )
continue;
((xl_disk_t *)gd->real_devices)[disk].capacity =
xdi->disks[i].capacity;
switch (xdi->disks[i].type) {
case XD_TYPE_CDROM:
set_device_ro(MKDEV(XLIDE_MAJOR, minor), 1);
// fall through
case XD_TYPE_FLOPPY:
case XD_TYPE_TAPE:
gd->flags[disk] = GENHD_FL_REMOVABLE;
printk(KERN_ALERT "Skipping partition check on %s /dev/%s\n",
xdi->disks[i].type == XD_TYPE_CDROM ? "cdrom" :
(xdi->disks[i].type == XD_TYPE_TAPE ? "tape" : "floppy"),
disk_name(gd, minor, buf));
break;
case XD_TYPE_DISK:
register_disk(gd, MKDEV(XLIDE_MAJOR, minor), 1<<XLIDE_PARTN_SHIFT,
&xlide_block_fops, xdi->disks[i].capacity);
break;
default:
printk(KERN_ALERT "XenoLinux: unknown ide device type %d\n",
xdi->disks[i].type);
break;
}
}
printk(KERN_ALERT
"XenoLinux Virtual IDE Device Driver installed [device: %d]\n",
XLIDE_MAJOR);
return 0;
}
void xlide_cleanup(void)
{
if ( xlide_gendisk == NULL ) return;
blk_cleanup_queue(BLK_DEFAULT_QUEUE(XLIDE_MAJOR));
xlide_gendisk = NULL;
read_ahead[XLIDE_MAJOR] = 0;
if ( blksize_size[XLIDE_MAJOR] != NULL )
{
kfree(blksize_size[XLIDE_MAJOR]);
blksize_size[XLIDE_MAJOR] = NULL;
}
if ( hardsect_size[XLIDE_MAJOR] != NULL )
{
kfree(hardsect_size[XLIDE_MAJOR]);
hardsect_size[XLIDE_MAJOR] = NULL;
}
if ( max_sectors[XLIDE_MAJOR] != NULL )
{
kfree(max_sectors[XLIDE_MAJOR]);
max_sectors[XLIDE_MAJOR] = NULL;
}
if ( unregister_blkdev(XLIDE_MAJOR, XLIDE_MAJOR_NAME) != 0 )
{
printk(KERN_ALERT
"XenoLinux Virtual IDE Device Driver uninstalled w/ errs\n");
}
}
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