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block: add aio_flush operation

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Instead stalling the VCPU while serving a cache flush try to do it
asynchronously.  Use our good old helper thread pool to issue an
asynchronous fdatasync for raw-posix.  Note that while Linux AIO
implements a fdatasync operation it is not useful for us because
it isn't actually implement in asynchronous fashion.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Christoph Hellwig 2009-09-04 19:01:49 +02:00 • committed by Anthony Liguori
parent 6f1953c4c1
commit b2e12bc6e3
6 changed files with 80 additions and 3 deletions
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17
block/raw-posix.c
View file

@ -574,6 +574,18 @@ static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
cb, opaque, QEMU_AIO_WRITE);
}
static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
{
BDRVRawState *s = bs->opaque;
if (fd_open(bs) < 0)
return NULL;
return paio_submit(bs, s->aio_ctx, s->fd, 0, NULL, 0,
cb, opaque, QEMU_AIO_FLUSH);
}
static void raw_close(BlockDriverState *bs)
{
BDRVRawState *s = bs->opaque;
@ -749,6 +761,7 @@ static BlockDriver bdrv_raw = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_truncate = raw_truncate,
.bdrv_getlength = raw_getlength,
@ -1002,6 +1015,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
@ -1096,6 +1110,7 @@ static BlockDriver bdrv_host_floppy = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
@ -1176,6 +1191,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
@ -1295,6 +1311,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,
.bdrv_aio_flush = raw_aio_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,