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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/bochs.c
View file

@ -209,6 +209,17 @@ static int bochs_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int bochs_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVBochsState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = bochs_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void bochs_close(BlockDriverState *bs)
{
BDRVBochsState *s = bs->opaque;
@ -220,7 +231,7 @@ static BlockDriver bdrv_bochs = {
.instance_size = sizeof(BDRVBochsState),
.bdrv_probe = bochs_probe,
.bdrv_open = bochs_open,
.bdrv_read = bochs_read,
.bdrv_read = bochs_co_read,
.bdrv_close = bochs_close,
};