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Blame SOURCES/kvm-job-Convert-block_job_cancel_async-to-Job.patch

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From 949b0b3562c3c98ce64dc15825f30e2c82260c01 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Tue, 26 Jun 2018 09:48:17 +0200
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Subject: [PATCH 109/268] job: Convert block_job_cancel_async() to Job
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180626094856.6924-35-kwolf@redhat.com>
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Patchwork-id: 81072
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH v2 34/73] job: Convert block_job_cancel_async() to Job
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Bugzilla: 1513543
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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block_job_cancel_async() did two things that were still block job
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specific:
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* Setting job->force. This field makes sense on the Job level, so we can
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  just move it. While at it, rename it to job->force_cancel to make its
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  purpose more obvious.
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* Resetting the I/O status. This can't be moved because generic Jobs
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  don't have an I/O status. What the function really implements is a
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  user resume, except without entering the coroutine. Consequently, it
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  makes sense to call the .user_resume driver callback here which
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  already resets the I/O status.
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  The old block_job_cancel_async() has two separate if statements that
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  check job->iostatus != BLOCK_DEVICE_IO_STATUS_OK and job->user_paused.
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  However, the former condition always implies the latter (as is
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  asserted in block_job_iostatus_reset()), so changing the explicit call
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  of block_job_iostatus_reset() on the former condition with the
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  .user_resume callback on the latter condition is equivalent and
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  doesn't need to access any BlockJob specific state.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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(cherry picked from commit 004e95df98266da33e08c9f1731aca71b6d6d7c4)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/mirror.c           |  4 ++--
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 blockjob.c               | 25 +++++++++++++------------
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 include/block/blockjob.h |  6 ------
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 include/qemu/job.h       |  6 ++++++
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 4 files changed, 21 insertions(+), 20 deletions(-)
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diff --git a/block/mirror.c b/block/mirror.c
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index e9a90ea..c3951d1 100644
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--- a/block/mirror.c
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+++ b/block/mirror.c
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@@ -871,7 +871,7 @@ static void coroutine_fn mirror_run(void *opaque)
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         trace_mirror_before_sleep(s, cnt, s->synced, delay_ns);
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         job_sleep_ns(&s->common.job, delay_ns);
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         if (job_is_cancelled(&s->common.job) &&
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-            (!s->synced || s->common.force))
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+            (!s->synced || s->common.job.force_cancel))
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         {
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             break;
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         }
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@@ -884,7 +884,7 @@ immediate_exit:
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          * or it was cancelled prematurely so that we do not guarantee that
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          * the target is a copy of the source.
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          */
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-        assert(ret < 0 || ((s->common.force || !s->synced) &&
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+        assert(ret < 0 || ((s->common.job.force_cancel || !s->synced) &&
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                job_is_cancelled(&s->common.job)));
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         assert(need_drain);
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         mirror_wait_for_all_io(s);
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diff --git a/blockjob.c b/blockjob.c
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index 34c57da..4cac367 100644
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--- a/blockjob.c
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+++ b/blockjob.c
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@@ -270,19 +270,20 @@ static int block_job_prepare(BlockJob *job)
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     return job->job.ret;
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 }
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-static void block_job_cancel_async(BlockJob *job, bool force)
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+static void job_cancel_async(Job *job, bool force)
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 {
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-    if (job->iostatus != BLOCK_DEVICE_IO_STATUS_OK) {
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-        block_job_iostatus_reset(job);
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-    }
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-    if (job->job.user_paused) {
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-        /* Do not call block_job_enter here, the caller will handle it.  */
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-        job->job.user_paused = false;
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-        job->job.pause_count--;
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+    if (job->user_paused) {
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+        /* Do not call job_enter here, the caller will handle it.  */
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+        job->user_paused = false;
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+        if (job->driver->user_resume) {
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+            job->driver->user_resume(job);
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+        }
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+        assert(job->pause_count > 0);
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+        job->pause_count--;
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     }
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-    job->job.cancelled = true;
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+    job->cancelled = true;
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     /* To prevent 'force == false' overriding a previous 'force == true' */
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-    job->force |= force;
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+    job->force_cancel |= force;
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 }
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 static int block_job_txn_apply(BlockJobTxn *txn, int fn(BlockJob *), bool lock)
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@@ -367,7 +368,7 @@ static void block_job_completed_txn_abort(BlockJob *job)
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      * on the caller, so leave it. */
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     QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
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         if (other_job != job) {
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-            block_job_cancel_async(other_job, false);
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+            job_cancel_async(&other_job->job, false);
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         }
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     }
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     while (!QLIST_EMPTY(&txn->jobs)) {
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@@ -527,7 +528,7 @@ void block_job_cancel(BlockJob *job, bool force)
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         job_do_dismiss(&job->job);
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         return;
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     }
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-    block_job_cancel_async(job, force);
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+    job_cancel_async(&job->job, force);
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     if (!job_started(&job->job)) {
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         block_job_completed(job, -ECANCELED);
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     } else if (job->job.deferred_to_main_loop) {
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diff --git a/include/block/blockjob.h b/include/block/blockjob.h
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index 3f405d1..d975efe 100644
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--- a/include/block/blockjob.h
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+++ b/include/block/blockjob.h
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@@ -51,12 +51,6 @@ typedef struct BlockJob {
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     BlockBackend *blk;
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     /**
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-     * Set to true if the job should abort immediately without waiting
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-     * for data to be in sync.
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-     */
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-    bool force;
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-
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-    /**
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      * Set to true when the job is ready to be completed.
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      */
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     bool ready;
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diff --git a/include/qemu/job.h b/include/qemu/job.h
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index 3e817be..2648c74 100644
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--- a/include/qemu/job.h
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+++ b/include/qemu/job.h
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@@ -97,6 +97,12 @@ typedef struct Job {
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      */
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     bool cancelled;
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+    /**
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+     * Set to true if the job should abort immediately without waiting
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+     * for data to be in sync.
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+     */
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+    bool force_cancel;
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+
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     /** Set to true when the job has deferred work to the main loop. */
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     bool deferred_to_main_loop;
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-- 
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1.8.3.1
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