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[PATCH v3 08/19] block/reqlist: add reqlist_wait_all()
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v3 08/19] block/reqlist: add reqlist_wait_all() |
Date: |
Wed, 22 Dec 2021 18:40:07 +0100 |
Add function to wait for all intersecting requests.
To be used in the further commit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
include/block/reqlist.h | 8 ++++++++
block/reqlist.c | 8 ++++++++
2 files changed, 16 insertions(+)
diff --git a/include/block/reqlist.h b/include/block/reqlist.h
index b904d80216..4695623bb3 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
+ * loops, 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 (may be some of them are not
* intersecting with shrunk request).
diff --git a/block/reqlist.c b/block/reqlist.c
index 5e320ba649..52a362a1d8 100644
--- a/block/reqlist.c
+++ b/block/reqlist.c
@@ -57,6 +57,14 @@ 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) {
--
2.31.1
- [PATCH v3 00/19] Make image fleecing more usable, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 07/19] block/dirty-bitmap: introduce bdrv_dirty_bitmap_status(), Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 01/19] block/block-copy: move copy_bitmap initialization to block_copy_state_new(), Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 08/19] block/reqlist: add reqlist_wait_all(),
Vladimir Sementsov-Ogievskiy <=
- [PATCH v3 02/19] block/dirty-bitmap: bdrv_merge_dirty_bitmap(): add return value, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 04/19] block/copy-before-write: add bitmap open parameter, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 10/19] block: introduce fleecing block driver, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 05/19] block/block-copy: add block_copy_reset(), Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 03/19] block/block-copy: block_copy_state_new(): add bitmap parameter, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 11/19] block/copy-before-write: support fleecing block driver, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 12/19] block/block-copy: add write-unchanged mode, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 06/19] block: intoduce reqlist, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 13/19] block/copy-before-write: use write-unchanged in fleecing mode, Vladimir Sementsov-Ogievskiy, 2021/12/22
- [PATCH v3 09/19] block: introduce FleecingState class, Vladimir Sementsov-Ogievskiy, 2021/12/22