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/******************************************************************************
* xc_vbd.c
*
* API for manipulating and accessing per-domain virtual block devices.
*
* Copyright (c) 2003, K A Fraser.
*/
#define _GNU_SOURCE
#include "xc_private.h"
int xc_vbd_create(int xc_handle,
u64 domid,
unsigned short vbdid,
int writeable)
{
block_io_op_t op;
op.cmd = BLOCK_IO_OP_VBD_CREATE;
op.u.create_params.domain = (domid_t)domid;
op.u.create_params.vdevice = vbdid;
op.u.create_params.mode = VBD_MODE_R | (writeable ? VBD_MODE_W : 0);
return do_block_io_op(xc_handle, &op);
}
int xc_vbd_destroy(int xc_handle,
u64 domid,
unsigned short vbdid)
{
block_io_op_t op;
op.cmd = BLOCK_IO_OP_VBD_DELETE;
op.u.delete_params.domain = (domid_t)domid;
op.u.delete_params.vdevice = vbdid;
return do_block_io_op(xc_handle, &op);
}
int xc_vbd_grow(int xc_handle,
u64 domid,
unsigned short vbdid,
xc_vbdextent_t *extent)
{
block_io_op_t op;
op.cmd = BLOCK_IO_OP_VBD_GROW;
op.u.grow_params.domain = (domid_t)domid;
op.u.grow_params.vdevice = vbdid;
op.u.grow_params.extent.device = extent->real_device;
op.u.grow_params.extent.start_sector = (xen_sector_t)extent->start_sector;
op.u.grow_params.extent.nr_sectors = (xen_sector_t)extent->nr_sectors;
return do_block_io_op(xc_handle, &op);
}
int xc_vbd_shrink(int xc_handle,
u64 domid,
unsigned short vbdid)
{
block_io_op_t op;
op.cmd = BLOCK_IO_OP_VBD_SHRINK;
op.u.shrink_params.domain = (domid_t)domid;
op.u.shrink_params.vdevice = vbdid;
return do_block_io_op(xc_handle, &op);
}
int xc_vbd_setextents(int xc_handle,
u64 domid,
unsigned short vbdid,
unsigned int nr_extents,
xc_vbdextent_t *extents)
{
int i, rc;
block_io_op_t op;
xen_extent_t *real_extents = NULL;
if ( nr_extents != 0 )
{
real_extents = malloc(nr_extents * sizeof(xc_vbdextent_t));
if ( (real_extents == NULL) ||
(mlock(real_extents, nr_extents * sizeof(xc_vbdextent_t)) != 0) )
{
if ( real_extents != NULL )
free(real_extents);
return -ENOMEM;
}
for ( i = 0; i < nr_extents; i++ )
{
real_extents[i].device = extents[i].real_device;
real_extents[i].start_sector =
(xen_sector_t)extents[i].start_sector;
real_extents[i].nr_sectors =
(xen_sector_t)extents[i].nr_sectors;
}
}
op.cmd = BLOCK_IO_OP_VBD_SET_EXTENTS;
op.u.setextents_params.domain = (domid_t)domid;
op.u.setextents_params.vdevice = vbdid;
op.u.setextents_params.nr_extents = nr_extents;
op.u.setextents_params.extents = real_extents;
rc = do_block_io_op(xc_handle, &op);
if ( real_extents != NULL )
{
(void)munlock(real_extents, nr_extents * sizeof(xc_vbdextent_t));
free(real_extents);
}
return rc;
}
int xc_vbd_getextents(int xc_handle,
u64 domid,
unsigned short vbdid,
unsigned int max_extents,
xc_vbdextent_t *extents,
int *writeable)
{
int i, rc;
block_io_op_t op;
xen_extent_t *real_extents = malloc(max_extents * sizeof(xc_vbdextent_t));
if ( (real_extents == NULL) ||
(mlock(real_extents, max_extents * sizeof(xc_vbdextent_t)) != 0) )
{
if ( real_extents != NULL )
free(real_extents);
return -ENOMEM;
}
op.cmd = BLOCK_IO_OP_VBD_INFO;
op.u.info_params.domain = (domid_t)domid;
op.u.info_params.vdevice = vbdid;
op.u.info_params.maxextents = max_extents;
op.u.info_params.extents = real_extents;
rc = do_block_io_op(xc_handle, &op);
(void)munlock(real_extents, max_extents * sizeof(xc_vbdextent_t));
if ( rc >= 0 )
{
for ( i = 0; i < op.u.info_params.nextents; i++ )
{
extents[i].real_device = real_extents[i].device;
extents[i].start_sector = (u64)real_extents[i].start_sector;
extents[i].nr_sectors = (u64)real_extents[i].nr_sectors;
}
if ( writeable != NULL )
*writeable = !!(op.u.info_params.mode & VBD_MODE_W);
rc = op.u.info_params.nextents;
}
free(real_extents);
return rc;
}
int xc_vbd_probe(int xc_handle,
u64 domid,
unsigned int max_vbds,
xc_vbd_t *vbds)
{
block_io_op_t op;
xen_disk_info_t *xdi = &op.u.probe_params.xdi;
int i, j, ret, allocsz = max_vbds * sizeof(xen_disk_t);
op.cmd = BLOCK_IO_OP_VBD_PROBE;
op.u.probe_params.domain = (domid_t)domid;
xdi->max = max_vbds;
xdi->disks = malloc(allocsz);
xdi->count = 0;
if ( (xdi->disks == NULL) || (mlock(xdi->disks, allocsz) != 0) )
{
if ( xdi->disks != NULL )
free(xdi->disks);
return -ENOMEM;
}
ret = do_block_io_op(xc_handle, &op);
(void)munlock(xdi->disks, allocsz);
if ( ret >= 0 )
{
for ( i = 0, j = 0; i < xdi->count; i++ )
{
if ( !(xdi->disks[i].info & XD_FLAG_VIRT) )
continue;
vbds[j].domid = (u64)xdi->disks[i].domain;
vbds[j].vbdid = xdi->disks[i].device;
vbds[j].flags = (xdi->disks[i].info & XD_FLAG_RO) ?
0 : XC_VBDF_WRITEABLE;
vbds[j].nr_sectors = (u64)xdi->disks[i].capacity;
j++;
}
ret = j;
}
free(xdi->disks);
return ret;
}
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