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[Qemu-devel] [PATCH v3 19/29] block: Allow wait_serialising_requests() a
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH v3 19/29] block: Allow wait_serialising_requests() at any point |
Date: |
Fri, 17 Jan 2014 15:15:09 +0100 |
We can only have a single wait_serialising_requests() call per request
because otherwise we can run into deadlocks where requests are waiting
for each other. The same is true when wait_serialising_requests() is not
at the very beginning of a request, so that other requests can be issued
between the start of the tracking and wait_serialising_requests().
Fix this by changing wait_serialising_requests() to ignore requests that
are already (directly or indirectly) waiting for the calling request.
Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
block.c | 13 ++++++++++---
include/block/block_int.h | 2 ++
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/block.c b/block.c
index e72966a..55e8c69 100644
--- a/block.c
+++ b/block.c
@@ -2148,9 +2148,16 @@ static void coroutine_fn
wait_serialising_requests(BdrvTrackedRequest *self)
*/
assert(qemu_coroutine_self() != req->co);
- qemu_co_queue_wait(&req->wait_queue);
- retry = true;
- break;
+ /* If the request is already (indirectly) waiting for us, or
+ * will wait for us as soon as it wakes up, then just go on
+ * (instead of producing a deadlock in the former case). */
+ if (!req->waiting_for) {
+ self->waiting_for = req;
+ qemu_co_queue_wait(&req->wait_queue);
+ self->waiting_for = NULL;
+ retry = true;
+ break;
+ }
}
}
} while (retry);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index ccd2c68..fdf0e0b 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -68,6 +68,8 @@ typedef struct BdrvTrackedRequest {
QLIST_ENTRY(BdrvTrackedRequest) list;
Coroutine *co; /* owner, used for deadlock detection */
CoQueue wait_queue; /* coroutines blocked on this request */
+
+ struct BdrvTrackedRequest *waiting_for;
} BdrvTrackedRequest;
struct BlockDriver {
--
1.8.1.4
- Re: [Qemu-devel] [PATCH v3 16/29] block: Make zero-after-EOF work with larger alignment, (continued)
- [Qemu-devel] [PATCH v3 14/29] block: Switch BdrvTrackedRequest to byte granularity, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 15/29] block: Allow waiting for overlapping requests between begin/end, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 17/29] block: Generalise and optimise COR serialisation, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 18/29] block: Make overlap range for serialisation dynamic, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 19/29] block: Allow wait_serialising_requests() at any point,
Kevin Wolf <=
- [Qemu-devel] [PATCH v3 20/29] block: Align requests in bdrv_co_do_pwritev(), Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 21/29] block: Assert serialisation assumptions in pwritev, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 22/29] block: Change coroutine wrapper to byte granularity, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 23/29] block: Make bdrv_pread() a bdrv_prwv_co() wrapper, Kevin Wolf, 2014/01/17
- [Qemu-devel] [PATCH v3 25/29] iscsi: Set bs->request_alignment, Kevin Wolf, 2014/01/17