aboutsummaryrefslogtreecommitdiff
path: root/block/cow.c
diff options
context:
space:
mode:
authorPaolo Bonzini <pbonzini@redhat.com>2011-10-20 13:16:23 +0200
committerKevin Wolf <kwolf@redhat.com>2011-10-21 17:34:14 +0200
commite183ef75cc28d31addbb937a4680090495786944 (patch)
tree780425093cc76f953a517f718550aa8febf58fd0 /block/cow.c
parent2914caa088e3fbbdbfd73106af0cae49af1d472e (diff)
block: take lock around bdrv_write implementations
This does the first part of the conversion to coroutines, by wrapping bdrv_write implementations to take the mutex. Drivers that implement bdrv_write rather than bdrv_co_writev 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. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/cow.c')
-rw-r--r--block/cow.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/block/cow.c b/block/cow.c
index a5fcd20817..29fa8444a3 100644
--- a/block/cow.c
+++ b/block/cow.c
@@ -226,6 +226,17 @@ static int cow_write(BlockDriverState *bs, int64_t sector_num,
return cow_update_bitmap(bs, sector_num, nb_sectors);
}
+static coroutine_fn int cow_co_write(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ int ret;
+ BDRVCowState *s = bs->opaque;
+ qemu_co_mutex_lock(&s->lock);
+ ret = cow_write(bs, sector_num, buf, nb_sectors);
+ qemu_co_mutex_unlock(&s->lock);
+ return ret;
+}
+
static void cow_close(BlockDriverState *bs)
{
}
@@ -320,7 +331,7 @@ static BlockDriver bdrv_cow = {
.bdrv_probe = cow_probe,
.bdrv_open = cow_open,
.bdrv_read = cow_co_read,
- .bdrv_write = cow_write,
+ .bdrv_write = cow_co_write,
.bdrv_close = cow_close,
.bdrv_create = cow_create,
.bdrv_flush = cow_flush,