[pve-devel] [PATCH pve-qemu 1/1] add block-commit-replaces option patch

[Alexandre Derumier via pve-devel <pve-devel@lists.proxmox.com>]

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From: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
To: pve-devel@lists.proxmox.com
Subject: [PATCH pve-qemu 1/1] add block-commit-replaces option patch
Date: Tue, 22 Apr 2025 13:51:22 +0200
Message-ID: <20250422115141.808427-2-alexandre.derumier@groupe-cyllene.com>

This is needed for external snapshot live commit,
when the top blocknode is not the fmt-node.
(in our case, the throttle-group node is the topnode)

Signed-off-by: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
---
 ...074-block-commit-add-replaces-option.patch | 137 ++++++++++++++++++
 debian/patches/series                         |   1 +
 2 files changed, 138 insertions(+)
 create mode 100644 debian/patches/pve/0074-block-commit-add-replaces-option.patch

diff --git a/debian/patches/pve/0074-block-commit-add-replaces-option.patch b/debian/patches/pve/0074-block-commit-add-replaces-option.patch
new file mode 100644
index 0000000..2488b5b
--- /dev/null
+++ b/debian/patches/pve/0074-block-commit-add-replaces-option.patch
@@ -0,0 +1,137 @@
+From ae39fd3bb72db440cf380978af9bf5693c12ac6c Mon Sep 17 00:00:00 2001
+From: Alexandre Derumier <alexandre.derumier@groupe-cyllene.com>
+Date: Wed, 11 Dec 2024 16:20:25 +0100
+Subject: [PATCH] block-commit: add replaces option
+
+This use same code than drive-mirror for live commit, but the option
+is not send currently.
+
+Allow to replaces a different node than the root node after the block-commit
+(as we use throttle-group as root, and not the drive)
+---
+ block/mirror.c                         | 4 ++--
+ block/replication.c                    | 2 +-
+ blockdev.c                             | 4 ++--
+ include/block/block_int-global-state.h | 4 +++-
+ qapi/block-core.json                   | 5 ++++-
+ qemu-img.c                             | 2 +-
+ 6 files changed, 13 insertions(+), 8 deletions(-)
+
+diff --git a/block/mirror.c b/block/mirror.c
+index 2f12238..1a5e528 100644
+--- a/block/mirror.c
++++ b/block/mirror.c
+@@ -2086,7 +2086,7 @@ BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
+                               int64_t speed, BlockdevOnError on_error,
+                               const char *filter_node_name,
+                               BlockCompletionFunc *cb, void *opaque,
+-                              bool auto_complete, Error **errp)
++                              bool auto_complete, const char *replaces, Error **errp)
+ {
+     bool base_read_only;
+     BlockJob *job;
+@@ -2102,7 +2102,7 @@ BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
+     }
+ 
+     job = mirror_start_job(
+-                     job_id, bs, creation_flags, base, NULL, speed, 0, 0,
++                     job_id, bs, creation_flags, base, replaces, speed, 0, 0,
+                      MIRROR_LEAVE_BACKING_CHAIN, false,
+                      on_error, on_error, true, cb, opaque,
+                      &commit_active_job_driver, MIRROR_SYNC_MODE_FULL,
+diff --git a/block/replication.c b/block/replication.c
+index 0415a5e..debbe25 100644
+--- a/block/replication.c
++++ b/block/replication.c
+@@ -711,7 +711,7 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
+         s->commit_job = commit_active_start(
+                             NULL, bs->file->bs, s->secondary_disk->bs,
+                             JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT,
+-                            NULL, replication_done, bs, true, errp);
++                            NULL, replication_done, bs, true, NULL, errp);
+         bdrv_graph_rdunlock_main_loop();
+         break;
+     default:
+diff --git a/blockdev.c b/blockdev.c
+index cbe2243..349fb71 100644
+--- a/blockdev.c
++++ b/blockdev.c
+@@ -2435,7 +2435,7 @@ void qmp_block_commit(const char *job_id, const char *device,
+                       const char *filter_node_name,
+                       bool has_auto_finalize, bool auto_finalize,
+                       bool has_auto_dismiss, bool auto_dismiss,
+-                      Error **errp)
++                      const char *replaces, Error **errp)
+ {
+     BlockDriverState *bs;
+     BlockDriverState *iter;
+@@ -2596,7 +2596,7 @@ void qmp_block_commit(const char *job_id, const char *device,
+             job_id = bdrv_get_device_name(bs);
+         }
+         commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
+-                            filter_node_name, NULL, NULL, false, &local_err);
++                            filter_node_name, NULL, NULL, false, replaces, &local_err);
+     } else {
+         BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
+         if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
+diff --git a/include/block/block_int-global-state.h b/include/block/block_int-global-state.h
+index f0c642b..194b580 100644
+--- a/include/block/block_int-global-state.h
++++ b/include/block/block_int-global-state.h
+@@ -115,6 +115,7 @@ void commit_start(const char *job_id, BlockDriverState *bs,
+  * @cb: Completion function for the job.
+  * @opaque: Opaque pointer value passed to @cb.
+  * @auto_complete: Auto complete the job.
++ * @replaces: Block graph node name to replace once the commit is done.
+  * @errp: Error object.
+  *
+  */
+@@ -123,7 +124,8 @@ BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
+                               int64_t speed, BlockdevOnError on_error,
+                               const char *filter_node_name,
+                               BlockCompletionFunc *cb, void *opaque,
+-                              bool auto_complete, Error **errp);
++                              bool auto_complete, const char *replaces,
++                              Error **errp);
+ /*
+  * mirror_start:
+  * @job_id: The id of the newly-created job, or %NULL to use the
+diff --git a/qapi/block-core.json b/qapi/block-core.json
+index ff441d4..50564c7 100644
+--- a/qapi/block-core.json
++++ b/qapi/block-core.json
+@@ -2098,6 +2098,8 @@
+ #     disappear from the query list without user intervention.
+ #     Defaults to true.  (Since 3.1)
+ #
++# @replaces: graph node name to be replaced base image node.
++#
+ # Features:
+ #
+ # @deprecated: Members @base and @top are deprecated.  Use @base-node
+@@ -2125,7 +2127,8 @@
+             '*speed': 'int',
+             '*on-error': 'BlockdevOnError',
+             '*filter-node-name': 'str',
+-            '*auto-finalize': 'bool', '*auto-dismiss': 'bool' },
++            '*auto-finalize': 'bool', '*auto-dismiss': 'bool',
++            '*replaces': 'str' },
+   'allow-preconfig': true }
+ 
+ ##
+diff --git a/qemu-img.c b/qemu-img.c
+index a6c88e0..f6c59bc 100644
+--- a/qemu-img.c
++++ b/qemu-img.c
+@@ -1079,7 +1079,7 @@ static int img_commit(int argc, char **argv)
+ 
+     commit_active_start("commit", bs, base_bs, JOB_DEFAULT, rate_limit,
+                         BLOCKDEV_ON_ERROR_REPORT, NULL, common_block_job_cb,
+-                        &cbi, false, &local_err);
++                        &cbi, false, NULL, &local_err);
+     if (local_err) {
+         goto done;
+     }
+-- 
+2.39.5
+
diff --git a/debian/patches/series b/debian/patches/series
index 18cd6ba..bc42583 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -88,3 +88,4 @@ pve/0070-PVE-backup-implement-bitmap-support-for-external-bac.patch
 pve/0071-PVE-backup-backup-access-api-indicate-situation-wher.patch
 pve/0072-PVE-backup-backup-access-api-explicit-bitmap-mode-pa.patch
 pve/0073-PVE-backup-backup-access-api-simplify-bitmap-logic.patch
+pve/0074-block-commit-add-replaces-option.patch
-- 
2.39.5



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