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charset="utf-8" Add flag to make serialising request no wait: if there are conflicting requests, just return error immediately. It's will be used in upcoming preallocate filter. Signed-off-by: Vladimir Sementsov-Ogievskiy --- include/block/block.h | 9 ++++++++- block/io.c | 13 ++++++++++++- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/include/block/block.h b/include/block/block.h index b8f4e86e8d..877fda06a4 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -67,8 +67,15 @@ typedef enum { * written to qiov parameter which may be NULL. */ BDRV_REQ_PREFETCH =3D 0x200, + + /* + * If we need to wait for other requests, just fail immediately. Used + * only together with BDRV_REQ_SERIALISING. + */ + BDRV_REQ_NO_WAIT =3D 0x400, + /* Mask of valid flags */ - BDRV_REQ_MASK =3D 0x3ff, + BDRV_REQ_MASK =3D 0x7ff, } BdrvRequestFlags; =20 typedef struct BlockSizes { diff --git a/block/io.c b/block/io.c index 96b1b9cf5f..fc6d44d302 100644 --- a/block/io.c +++ b/block/io.c @@ -1911,9 +1911,20 @@ bdrv_co_write_req_prepare(BdrvChild *child, int64_t = offset, uint64_t bytes, assert(!(bs->open_flags & BDRV_O_INACTIVE)); assert((bs->open_flags & BDRV_O_NO_IO) =3D=3D 0); assert(!(flags & ~BDRV_REQ_MASK)); + assert(!((flags & BDRV_REQ_NO_WAIT) && !(flags & BDRV_REQ_SERIALISING)= )); =20 if (flags & BDRV_REQ_SERIALISING) { - bdrv_make_request_serialising(req, bdrv_get_cluster_size(bs)); + qemu_co_mutex_lock(&bs->reqs_lock); + + tracked_request_set_serialising(req, bdrv_get_cluster_size(bs)); + + if ((flags & BDRV_REQ_NO_WAIT) && bdrv_find_conflicting_request(re= q)) { + return -EBUSY; + } + + bdrv_wait_serialising_requests_locked(req); + + qemu_co_mutex_unlock(&bs->reqs_lock); } else { bdrv_wait_serialising_requests(req); } --=20 2.18.0