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82 lines
3.7 KiB
82 lines
3.7 KiB
9 months ago
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From e1e2f3972065c4b5d6fcf37e0e1c4fb92a0d5260 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 5 Dec 2023 13:20:06 -0500
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Subject: [PATCH 089/101] aio-wait: draw equivalence between AIO_WAIT_WHILE()
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and AIO_WAIT_WHILE_UNLOCKED()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 214: Remove AioContext lock
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RH-Jira: RHEL-15965
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Commit: [20/26] 20e49777869714c99769263103f1b0c2c370cfcd (kmwolf/centos-qemu-kvm)
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Now that the AioContext lock no longer exists, AIO_WAIT_WHILE() and
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AIO_WAIT_WHILE_UNLOCKED() are equivalent.
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A future patch will get rid of AIO_WAIT_WHILE_UNLOCKED().
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Message-ID: <20231205182011.1976568-10-stefanha@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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include/block/aio-wait.h | 16 ++++------------
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1 file changed, 4 insertions(+), 12 deletions(-)
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diff --git a/include/block/aio-wait.h b/include/block/aio-wait.h
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index 5449b6d742..157f105916 100644
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--- a/include/block/aio-wait.h
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+++ b/include/block/aio-wait.h
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@@ -63,9 +63,6 @@ extern AioWait global_aio_wait;
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* @ctx: the aio context, or NULL if multiple aio contexts (for which the
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* caller does not hold a lock) are involved in the polling condition.
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* @cond: wait while this conditional expression is true
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- * @unlock: whether to unlock and then lock again @ctx. This applies
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- * only when waiting for another AioContext from the main loop.
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- * Otherwise it's ignored.
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*
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* Wait while a condition is true. Use this to implement synchronous
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* operations that require event loop activity.
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@@ -78,7 +75,7 @@ extern AioWait global_aio_wait;
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* wait on conditions between two IOThreads since that could lead to deadlock,
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* go via the main loop instead.
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*/
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-#define AIO_WAIT_WHILE_INTERNAL(ctx, cond, unlock) ({ \
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+#define AIO_WAIT_WHILE_INTERNAL(ctx, cond) ({ \
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bool waited_ = false; \
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AioWait *wait_ = &global_aio_wait; \
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AioContext *ctx_ = (ctx); \
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@@ -95,13 +92,7 @@ extern AioWait global_aio_wait;
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assert(qemu_get_current_aio_context() == \
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qemu_get_aio_context()); \
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while ((cond)) { \
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- if (unlock && ctx_) { \
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- aio_context_release(ctx_); \
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- } \
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aio_poll(qemu_get_aio_context(), true); \
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- if (unlock && ctx_) { \
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- aio_context_acquire(ctx_); \
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- } \
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waited_ = true; \
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} \
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} \
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@@ -109,10 +100,11 @@ extern AioWait global_aio_wait;
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waited_; })
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#define AIO_WAIT_WHILE(ctx, cond) \
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- AIO_WAIT_WHILE_INTERNAL(ctx, cond, true)
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+ AIO_WAIT_WHILE_INTERNAL(ctx, cond)
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+/* TODO replace this with AIO_WAIT_WHILE() in a future patch */
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#define AIO_WAIT_WHILE_UNLOCKED(ctx, cond) \
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- AIO_WAIT_WHILE_INTERNAL(ctx, cond, false)
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+ AIO_WAIT_WHILE_INTERNAL(ctx, cond)
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/**
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* aio_wait_kick:
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--
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2.39.3
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