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iscsi: factor out sector conversions 

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2013-07-11 14:16:25 +02:00 committed by Paolo Bonzini
parent 91bea4e2bb
commit 0777b5dde4
1 changed files with 7 additions and 3 deletions
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10
block/iscsi.c
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@ -232,6 +232,11 @@ iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status,
iscsi_schedule_bh(acb);
}
static int64_t sector_lun2qemu(int64_t sector, IscsiLun *iscsilun)
{
return sector * iscsilun->block_size / BDRV_SECTOR_SIZE;
}
static int64_t sector_qemu2lun(int64_t sector, IscsiLun *iscsilun)
{
return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
@ -296,7 +301,7 @@ iscsi_aio_writev_acb(IscsiAIOCB *acb)
lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
*(uint32_t *)&acb->task->cdb[2] = htonl(lba >> 32);
*(uint32_t *)&acb->task->cdb[6] = htonl(lba & 0xffffffff);
num_sectors = size / acb->iscsilun->block_size;
num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun);
*(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
acb->task->expxferlen = size;
@ -1161,8 +1166,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags)
if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) {
goto out;
}
bs->total_sectors = iscsilun->num_blocks *
iscsilun->block_size / BDRV_SECTOR_SIZE ;
bs->total_sectors = sector_lun2qemu(iscsilun->num_blocks, iscsilun);
/* Medium changer or tape. We dont have any emulation for this so this must
* be sg ioctl compatible. We force it to be sg, otherwise qemu will try