diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2011-10-20 13:16:23 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-10-21 17:34:14 +0200 |
| commit | e183ef75cc28d31addbb937a4680090495786944 (patch) | |
| tree | 780425093cc76f953a517f718550aa8febf58fd0 /block/cow.c | |
| parent | 2914caa088e3fbbdbfd73106af0cae49af1d472e (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.c | 13 |
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, |