[PATCH v3 9/9] mirror: return mirror-specific information upon query

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[PATCH v3 9/9] mirror: return mirror-specific information upon query

From:	Fiona Ebner
Subject:	[PATCH v3 9/9] mirror: return mirror-specific information upon query
Date:	Fri, 13 Oct 2023 11:21:43 +0200

To start out, only actively-synced is returned.

For example, this is useful for jobs that started out in background
mode and switched to active mode. Once actively-synced is true, it's
clear that the mode switch has been completed. Note that completion of
the switch might happen much earlier, e.g. if the switch happens
before the job is ready, once all background operations have finished.
It's assumed that whether the disks are actively-synced or not is more
interesting than whether the mode switch completed. That information
can still be added if required in the future.

In presence of an iothread, the actively_synced member is now shared
between the iothread and the main thread, so turn accesses to it
atomic.

Requires to adapt the output for iotest 109.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---

Changes in v3:
    * squash with patch adapting iotest output
    * turn accesses to actively_synced atomic

 block/mirror.c             | 21 ++++++++++++++++-----
 qapi/block-core.json       | 16 +++++++++++++++-
 tests/qemu-iotests/109.out | 24 ++++++++++++------------
 3 files changed, 43 insertions(+), 18 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 889cce5414..b305c03918 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -122,7 +122,7 @@ typedef enum MirrorMethod {
 static BlockErrorAction mirror_error_action(MirrorBlockJob *s, bool read,
                                             int error)
 {
-    s->actively_synced = false;
+    qatomic_set(&s->actively_synced, false);
     if (read) {
         return block_job_error_action(&s->common, s->on_source_error,
                                       true, error);
@@ -962,7 +962,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
     if (s->bdev_length == 0) {
         /* Transition to the READY state and wait for complete. */
         job_transition_to_ready(&s->common.job);
-        s->actively_synced = true;
+        qatomic_set(&s->actively_synced, true);
         while (!job_cancel_requested(&s->common.job) && !s->should_complete) {
             job_yield(&s->common.job);
         }
@@ -1076,7 +1076,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
                 job_transition_to_ready(&s->common.job);
             }
             if (qatomic_read(&s->copy_mode) != MIRROR_COPY_MODE_BACKGROUND) {
-                s->actively_synced = true;
+                qatomic_set(&s->actively_synced, true);
             }
 
             should_complete = s->should_complete ||
@@ -1272,6 +1272,15 @@ static void mirror_change(BlockJob *job, 
BlockJobChangeOptions *opts,
     }
 }
 
+static void mirror_query(BlockJob *job, BlockJobInfo *info)
+{
+    MirrorBlockJob *s = container_of(job, MirrorBlockJob, common);
+
+    info->u.mirror = (BlockJobInfoMirror) {
+        .actively_synced = qatomic_read(&s->actively_synced),
+    };
+}
+
 static const BlockJobDriver mirror_job_driver = {
     .job_driver = {
         .instance_size          = sizeof(MirrorBlockJob),
@@ -1287,6 +1296,7 @@ static const BlockJobDriver mirror_job_driver = {
     },
     .drained_poll           = mirror_drained_poll,
     .change                 = mirror_change,
+    .query                  = mirror_query,
 };
 
 static const BlockJobDriver commit_active_job_driver = {
@@ -1405,7 +1415,7 @@ do_sync_target_write(MirrorBlockJob *job, MirrorMethod 
method,
         bitmap_end = QEMU_ALIGN_UP(offset + bytes, job->granularity);
         bdrv_set_dirty_bitmap(job->dirty_bitmap, bitmap_offset,
                               bitmap_end - bitmap_offset);
-        job->actively_synced = false;
+        qatomic_set(&job->actively_synced, false);
 
         action = mirror_error_action(job, false, -ret);
         if (action == BLOCK_ERROR_ACTION_REPORT) {
@@ -1464,7 +1474,8 @@ static void coroutine_fn GRAPH_RDLOCK 
active_write_settle(MirrorOp *op)
     uint64_t end_chunk = DIV_ROUND_UP(op->offset + op->bytes,
                                       op->s->granularity);
 
-    if (!--op->s->in_active_write_counter && op->s->actively_synced) {
+    if (!--op->s->in_active_write_counter &&
+        qatomic_read(&op->s->actively_synced)) {
         BdrvChild *source = op->s->mirror_top_bs->backing;
 
         if (QLIST_FIRST(&source->bs->parents) == source &&
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 950542b735..35d67410cc 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -1352,6 +1352,20 @@
 { 'enum': 'MirrorCopyMode',
   'data': ['background', 'write-blocking'] }
 
+##
+# @BlockJobInfoMirror:
+#
+# Information specific to mirror block jobs.
+#
+# @actively-synced: Whether the source is actively synced to the
+#     target, i.e. same data and new writes are done synchronously to
+#     both.
+#
+# Since 8.2
+##
+{ 'struct': 'BlockJobInfoMirror',
+  'data': { 'actively-synced': 'bool' } }
+
 ##
 # @BlockJobInfo:
 #
@@ -1403,7 +1417,7 @@
            'auto-finalize': 'bool', 'auto-dismiss': 'bool',
            '*error': 'str' },
   'discriminator': 'type',
-  'data': {} }
+  'data': { 'mirror': 'BlockJobInfoMirror' } }
 
 ##
 # @query-block-jobs:
diff --git a/tests/qemu-iotests/109.out b/tests/qemu-iotests/109.out
index 2611d6a40f..965c9a6a0a 100644
--- a/tests/qemu-iotests/109.out
+++ b/tests/qemu-iotests/109.out
@@ -38,7 +38,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 1024, "offset": 1024, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 1024, "offset": 1024, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 1024, "offset": 1024, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -90,7 +90,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 197120, "offset": 197120, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 197120, "offset": 197120, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 197120, "offset": 197120, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -142,7 +142,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 327680, "offset": 327680, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 327680, "offset": 327680, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 327680, "offset": 327680, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -194,7 +194,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 1024, "offset": 1024, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 1024, "offset": 1024, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 1024, "offset": 1024, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -246,7 +246,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 65536, "offset": 65536, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 65536, "offset": 65536, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 65536, "offset": 65536, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -298,7 +298,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 2560, "offset": 2560, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2560, "offset": 2560, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2560, "offset": 2560, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -349,7 +349,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 2560, "offset": 2560, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2560, "offset": 2560, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2560, "offset": 2560, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -400,7 +400,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 31457280, "offset": 
31457280, "speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 31457280, "offset": 31457280, 
"status": "ready", "paused": false, "speed": 0, "ready": true, "type": 
"mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 31457280, "offset": 31457280, 
"status": "ready", "paused": false, "speed": 0, "ready": true, "type": 
"mirror", "actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -451,7 +451,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 327680, "offset": 327680, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 327680, "offset": 327680, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 327680, "offset": 327680, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -502,7 +502,7 @@ read 512/512 bytes at offset 0
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 2048, "offset": 2048, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2048, "offset": 2048, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 2048, "offset": 2048, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -533,7 +533,7 @@ WARNING: Image format was not specified for 
'TEST_DIR/t.raw' and probing guessed
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 512, "offset": 512, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 512, "offset": 512, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 512, "offset": 512, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
@@ -557,7 +557,7 @@ Images are identical.
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"JOB_STATUS_CHANGE", "data": {"status": "ready", "id": "src"}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"BLOCK_JOB_READY", "data": {"device": "src", "len": 512, "offset": 512, 
"speed": 0, "type": "mirror"}}
 {"execute":"query-block-jobs"}
-{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 512, "offset": 512, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror"}]}
+{"return": [{"auto-finalize": true, "io-status": "ok", "device": "src", 
"auto-dismiss": true, "busy": false, "len": 512, "offset": 512, "status": 
"ready", "paused": false, "speed": 0, "ready": true, "type": "mirror", 
"actively-synced": false}]}
 {"execute":"quit"}
 {"return": {}}
 {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
"SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
-- 
2.39.2

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[PATCH v3 4/9] block/mirror: determine copy_to_target only once, (continued)
- [PATCH v3 4/9] block/mirror: determine copy_to_target only once, Fiona Ebner, 2023/10/13
- [PATCH v3 6/9] qapi/block-core: use JobType for BlockJobInfo's type, Fiona Ebner, 2023/10/13
  - Re: [PATCH v3 6/9] qapi/block-core: use JobType for BlockJobInfo's type, Markus Armbruster, 2023/10/18
- [PATCH v3 5/9] mirror: implement mirror_change method, Fiona Ebner, 2023/10/13
  - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Markus Armbruster, 2023/10/18
  - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Kevin Wolf, 2023/10/18
    - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Fiona Ebner, 2023/10/23
    - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Kevin Wolf, 2023/10/23
    - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Fiona Ebner, 2023/10/23
    - Re: [PATCH v3 5/9] mirror: implement mirror_change method, Kevin Wolf, 2023/10/24
- [PATCH v3 9/9] mirror: return mirror-specific information upon query, Fiona Ebner <=
- Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Markus Armbruster, 2023/10/18
  - Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Fiona Ebner, 2023/10/18
- Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Kevin Wolf, 2023/10/19
  - Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Fiona Ebner, 2023/10/23
    - Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Fiona Ebner, 2023/10/25
    - Re: [PATCH v3 0/9] mirror: allow switching from background to active mode, Kevin Wolf, 2023/10/25

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