From 3b7ca26bdf1eb1f9703048831d442adbb103069b Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Thu, 3 Mar 2022 20:43:42 +0100 Subject: [PATCH] block/reqlist: add reqlist_wait_all() Add function to wait for all intersecting requests. To be used in the further commit. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Nikita Lapshin Reviewed-by: Hanna Reitz Message-Id: <20220303194349.2304213-10-vsementsov@virtuozzo.com> Signed-off-by: Hanna Reitz --- block/reqlist.c | 8 ++++++++ include/block/reqlist.h | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/block/reqlist.c b/block/reqlist.c index 09fecbd48c..08cb57cfa4 100644 --- a/block/reqlist.c +++ b/block/reqlist.c @@ -58,6 +58,14 @@ bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset, return true; } +void coroutine_fn reqlist_wait_all(BlockReqList *reqs, int64_t offset, + int64_t bytes, CoMutex *lock) +{ + while (reqlist_wait_one(reqs, offset, bytes, lock)) { + /* continue */ + } +} + void coroutine_fn reqlist_shrink_req(BlockReq *req, int64_t new_bytes) { if (new_bytes == req->bytes) { diff --git a/include/block/reqlist.h b/include/block/reqlist.h index 0fa1eef259..5253497bae 100644 --- a/include/block/reqlist.h +++ b/include/block/reqlist.h @@ -53,6 +53,14 @@ BlockReq *reqlist_find_conflict(BlockReqList *reqs, int64_t offset, bool coroutine_fn reqlist_wait_one(BlockReqList *reqs, int64_t offset, int64_t bytes, CoMutex *lock); +/* + * Wait for all intersecting requests. It just calls reqlist_wait_one() in a + * loop, caller is responsible to stop producing new requests in this region + * in parallel, otherwise reqlist_wait_all() may never return. + */ +void coroutine_fn reqlist_wait_all(BlockReqList *reqs, int64_t offset, + int64_t bytes, CoMutex *lock); + /* * Shrink request and wake all waiting coroutines (maybe some of them are not * intersecting with shrunk request).