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Blame SOURCES/kvm-blockjob-Introduce-block_job_ratelimit_get_delay.patch

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From a266d0b6b07ddf185c5f2eaa05bda38e279ac36f 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 09:47:55 +0200
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Subject: [PATCH 087/268] blockjob: Introduce block_job_ratelimit_get_delay()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20180626094856.6924-13-kwolf@redhat.com>
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Patchwork-id: 81079
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH v2 12/73] blockjob: Introduce block_job_ratelimit_get_delay()
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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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This gets us rid of more direct accesses to BlockJob fields from the
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job drivers.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit dee81d5111ff0e24ac63ab0dbbd19e84c2f87904)
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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/backup.c               | 18 +++++++-----------
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 block/commit.c               |  4 ++--
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 block/mirror.c               |  5 +----
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 block/stream.c               |  4 ++--
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 blockjob.c                   |  9 +++++++++
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 include/block/blockjob_int.h |  8 ++++++++
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 6 files changed, 29 insertions(+), 19 deletions(-)
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diff --git a/block/backup.c b/block/backup.c
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index 8468fd9..cfdb6ec 100644
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--- a/block/backup.c
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+++ b/block/backup.c
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@@ -325,21 +325,17 @@ static void backup_complete(BlockJob *job, void *opaque)
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 static bool coroutine_fn yield_and_check(BackupBlockJob *job)
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 {
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+    uint64_t delay_ns;
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+
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     if (block_job_is_cancelled(&job->common)) {
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         return true;
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     }
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-    /* we need to yield so that bdrv_drain_all() returns.
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-     * (without, VM does not reboot)
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-     */
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-    if (job->common.speed) {
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-        uint64_t delay_ns = ratelimit_calculate_delay(&job->common.limit,
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-                                                      job->bytes_read);
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-        job->bytes_read = 0;
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-        block_job_sleep_ns(&job->common, delay_ns);
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-    } else {
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-        block_job_sleep_ns(&job->common, 0);
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-    }
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+    /* We need to yield even for delay_ns = 0 so that bdrv_drain_all() can
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+     * return. Without a yield, the VM would not reboot. */
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+    delay_ns = block_job_ratelimit_get_delay(&job->common, job->bytes_read);
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+    job->bytes_read = 0;
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+    block_job_sleep_ns(&job->common, delay_ns);
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     if (block_job_is_cancelled(&job->common)) {
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         return true;
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diff --git a/block/commit.c b/block/commit.c
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index 46cbeae..ba5df6a 100644
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--- a/block/commit.c
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+++ b/block/commit.c
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@@ -197,8 +197,8 @@ static void coroutine_fn commit_run(void *opaque)
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         /* Publish progress */
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         block_job_progress_update(&s->common, n);
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-        if (copy && s->common.speed) {
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-            delay_ns = ratelimit_calculate_delay(&s->common.limit, n);
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+        if (copy) {
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+            delay_ns = block_job_ratelimit_get_delay(&s->common, n);
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         } else {
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             delay_ns = 0;
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         }
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diff --git a/block/mirror.c b/block/mirror.c
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index d5e0ff2..a4197bb 100644
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--- a/block/mirror.c
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+++ b/block/mirror.c
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@@ -447,10 +447,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
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         assert(io_bytes);
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         offset += io_bytes;
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         nb_chunks -= DIV_ROUND_UP(io_bytes, s->granularity);
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-        if (s->common.speed) {
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-            delay_ns = ratelimit_calculate_delay(&s->common.limit,
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-                                                 io_bytes_acct);
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-        }
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+        delay_ns = block_job_ratelimit_get_delay(&s->common, io_bytes_acct);
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     }
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     return delay_ns;
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 }
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diff --git a/block/stream.c b/block/stream.c
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index 797d7c4..df9660d 100644
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--- a/block/stream.c
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+++ b/block/stream.c
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@@ -185,8 +185,8 @@ static void coroutine_fn stream_run(void *opaque)
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         /* Publish progress */
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         block_job_progress_update(&s->common, n);
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-        if (copy && s->common.speed) {
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-            delay_ns = ratelimit_calculate_delay(&s->common.limit, n);
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+        if (copy) {
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+            delay_ns = block_job_ratelimit_get_delay(&s->common, n);
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         } else {
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             delay_ns = 0;
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         }
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diff --git a/blockjob.c b/blockjob.c
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index 0f7214c..e30f5ec 100644
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--- a/blockjob.c
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+++ b/blockjob.c
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@@ -688,6 +688,15 @@ void block_job_set_speed(BlockJob *job, int64_t speed, Error **errp)
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     block_job_enter_cond(job, block_job_timer_pending);
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 }
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+int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n)
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+{
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+    if (!job->speed) {
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+        return 0;
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+    }
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+
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+    return ratelimit_calculate_delay(&job->limit, n);
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+}
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+
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 void block_job_complete(BlockJob *job, Error **errp)
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 {
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     /* Should not be reachable via external interface for internal jobs */
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diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
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index ad510d5..62ec964 100644
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--- a/include/block/blockjob_int.h
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+++ b/include/block/blockjob_int.h
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@@ -166,6 +166,14 @@ void block_job_sleep_ns(BlockJob *job, int64_t ns);
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 void block_job_yield(BlockJob *job);
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 /**
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+ * block_job_ratelimit_get_delay:
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+ *
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+ * Calculate and return delay for the next request in ns. See the documentation
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+ * of ratelimit_calculate_delay() for details.
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+ */
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+int64_t block_job_ratelimit_get_delay(BlockJob *job, uint64_t n);
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+
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+/**
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  * block_job_early_fail:
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  * @bs: The block device.
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  *
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-- 
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1.8.3.1
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