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block: take lock around bdrv_read implementations

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This does the first part of the conversion to coroutines, by
wrapping bdrv_read implementations to take the mutex.

Drivers that implement bdrv_read rather than bdrv_co_readv can
then benefit from asynchronous operation (at least if the underlying
protocol supports it, which is not the case for raw-win32), even
though they still operate with a bounce buffer.

raw-win32 does not need the lock, because it cannot yield.
nbd also doesn't probably, but better be safe.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-20 13:16:22 +02:00 • committed by Kevin Wolf
parent 848c66e8f5
commit 2914caa088
9 changed files with 108 additions and 9 deletions
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13
block/parallels.c
View file

@ -136,6 +136,17 @@ static int parallels_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVParallelsState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = parallels_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void parallels_close(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
@ -147,7 +158,7 @@ static BlockDriver bdrv_parallels = {
.instance_size = sizeof(BDRVParallelsState),
.bdrv_probe = parallels_probe,
.bdrv_open = parallels_open,
.bdrv_read = parallels_read,
.bdrv_read = parallels_co_read,
.bdrv_close = parallels_close,
};