From 2914caa088e3fbbdbfd73106af0cae49af1d472e Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 20 Oct 2011 13:16:22 +0200 Subject: block: take lock around bdrv_read implementations 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 Signed-off-by: Kevin Wolf --- block/dmg.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'block/dmg.c') diff --git a/block/dmg.c b/block/dmg.c index 111aeaecd9..37902a4347 100644 --- a/block/dmg.c +++ b/block/dmg.c @@ -282,6 +282,17 @@ static int dmg_read(BlockDriverState *bs, int64_t sector_num, return 0; } +static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num, + uint8_t *buf, int nb_sectors) +{ + int ret; + BDRVDMGState *s = bs->opaque; + qemu_co_mutex_lock(&s->lock); + ret = dmg_read(bs, sector_num, buf, nb_sectors); + qemu_co_mutex_unlock(&s->lock); + return ret; +} + static void dmg_close(BlockDriverState *bs) { BDRVDMGState *s = bs->opaque; @@ -302,7 +313,7 @@ static BlockDriver bdrv_dmg = { .instance_size = sizeof(BDRVDMGState), .bdrv_probe = dmg_probe, .bdrv_open = dmg_open, - .bdrv_read = dmg_read, + .bdrv_read = dmg_co_read, .bdrv_close = dmg_close, }; -- cgit v1.2.3