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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/vvfat.c
parent2914caa088e3fbbdbfd73106af0cae49af1d472e (diff)
downloadqemu-e183ef75cc28d31addbb937a4680090495786944.zip
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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/vvfat.c')
-rw-r--r--block/vvfat.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/block/vvfat.c b/block/vvfat.c
index 970cccf..e1fcdbc 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2727,6 +2727,17 @@ DLOG(checkpoint());
return 0;
}
+static coroutine_fn int vvfat_co_write(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ int ret;
+ BDRVVVFATState *s = bs->opaque;
+ qemu_co_mutex_lock(&s->lock);
+ ret = vvfat_write(bs, sector_num, buf, nb_sectors);
+ qemu_co_mutex_unlock(&s->lock);
+ return ret;
+}
+
static int vvfat_is_allocated(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int* n)
{
@@ -2817,7 +2828,7 @@ static BlockDriver bdrv_vvfat = {
.instance_size = sizeof(BDRVVVFATState),
.bdrv_file_open = vvfat_open,
.bdrv_read = vvfat_co_read,
- .bdrv_write = vvfat_write,
+ .bdrv_write = vvfat_co_write,
.bdrv_close = vvfat_close,
.bdrv_is_allocated = vvfat_is_allocated,
.protocol_name = "fat",