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quorum: Add quorum_aio_readv. 

Add code to do num_children reads in parallel and cleanup the structures
afterwards.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2014-02-21 22:21:14 +01:00 committed by Kevin Wolf
parent f70d7f7e4d
commit 7db6982a19
1 changed files with 38 additions and 1 deletions
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39
block/quorum.c
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@ -91,10 +91,18 @@ static AIOCBInfo quorum_aiocb_info = {
static void quorum_aio_finalize(QuorumAIOCB *acb)
{
int ret = 0;
BDRVQuorumState *s = acb->common.bs->opaque;
int i, ret = 0;
acb->common.cb(acb->common.opaque, ret);
if (acb->is_read) {
for (i = 0; i < s->num_children; i++) {
qemu_vfree(acb->qcrs[i].buf);
qemu_iovec_destroy(&acb->qcrs[i].qiov);
}
}
g_free(acb->qcrs);
qemu_aio_release(acb);
}
@ -149,6 +157,34 @@ static void quorum_aio_cb(void *opaque, int ret)
quorum_aio_finalize(acb);
}
static BlockDriverAIOCB *quorum_aio_readv(BlockDriverState *bs,
int64_t sector_num,
QEMUIOVector *qiov,
int nb_sectors,
BlockDriverCompletionFunc *cb,
void *opaque)
{
BDRVQuorumState *s = bs->opaque;
QuorumAIOCB *acb = quorum_aio_get(s, bs, qiov, sector_num,
nb_sectors, cb, opaque);
int i;
acb->is_read = true;
for (i = 0; i < s->num_children; i++) {
acb->qcrs[i].buf = qemu_blockalign(s->bs[i], qiov->size);
qemu_iovec_init(&acb->qcrs[i].qiov, qiov->niov);
qemu_iovec_clone(&acb->qcrs[i].qiov, qiov, acb->qcrs[i].buf);
}
for (i = 0; i < s->num_children; i++) {
bdrv_aio_readv(s->bs[i], sector_num, qiov, nb_sectors,
quorum_aio_cb, &acb->qcrs[i]);
}
return &acb->common;
}
static BlockDriverAIOCB *quorum_aio_writev(BlockDriverState *bs,
int64_t sector_num,
QEMUIOVector *qiov,
@ -176,6 +212,7 @@ static BlockDriver bdrv_quorum = {
.instance_size = sizeof(BDRVQuorumState),
.bdrv_aio_readv = quorum_aio_readv,
.bdrv_aio_writev = quorum_aio_writev,
};