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Blame SOURCES/kvm-blockdev-unify-qmp_blockdev_backup-and-blockdev-back.patch

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From 959955217f745f1ee6cbea97314efe69f2d7dc08 Mon Sep 17 00:00:00 2001
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From: Sergio Lopez Pascual <slp@redhat.com>
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Date: Fri, 7 Feb 2020 11:27:43 +0000
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Subject: [PATCH 10/18] blockdev: unify qmp_blockdev_backup and blockdev-backup
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 transaction paths
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RH-Author: Sergio Lopez Pascual <slp@redhat.com>
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Message-id: <20200207112749.25073-4-slp@redhat.com>
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Patchwork-id: 93756
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 3/9] blockdev: unify qmp_blockdev_backup and blockdev-backup transaction paths
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Bugzilla: 1745606 1746217 1773517 1779036 1782111 1782175 1783965
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Issuing a blockdev-backup from qmp_blockdev_backup takes a slightly
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different path than when it's issued from a transaction. In the code,
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this is manifested as some redundancy between do_blockdev_backup() and
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blockdev_backup_prepare().
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This change unifies both paths, merging do_blockdev_backup() and
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blockdev_backup_prepare(), and changing qmp_blockdev_backup() to
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create a transaction instead of calling do_backup_common() direcly.
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As a side-effect, now qmp_blockdev_backup() is executed inside a
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drained section, as it happens when creating a blockdev-backup
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transaction. This change is visible from the user's perspective, as
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the job gets paused and immediately resumed before starting the actual
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work.
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Signed-off-by: Sergio Lopez <slp@redhat.com>
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Reviewed-by: Max Reitz <mreitz@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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(cherry picked from commit 5b7bfe515ecbd584b40ff6e41d2fd8b37c7d5139)
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Signed-off-by: Sergio Lopez <slp@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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 blockdev.c | 60 +++++++++++++-----------------------------------------------
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 1 file changed, 13 insertions(+), 47 deletions(-)
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diff --git a/blockdev.c b/blockdev.c
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index 5e85fc0..152a0f7 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -1940,16 +1940,13 @@ typedef struct BlockdevBackupState {
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     BlockJob *job;
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 } BlockdevBackupState;
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-static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
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-                                    Error **errp);
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-
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 static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
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 {
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     BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
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     BlockdevBackup *backup;
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-    BlockDriverState *bs, *target;
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+    BlockDriverState *bs;
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+    BlockDriverState *target_bs;
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     AioContext *aio_context;
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-    Error *local_err = NULL;
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     assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
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     backup = common->action->u.blockdev_backup.data;
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@@ -1959,8 +1956,8 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
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         return;
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     }
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-    target = bdrv_lookup_bs(backup->target, backup->target, errp);
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-    if (!target) {
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+    target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
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+    if (!target_bs) {
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         return;
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     }
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@@ -1971,13 +1968,10 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
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     /* Paired with .clean() */
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     bdrv_drained_begin(state->bs);
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-    state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
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-    if (local_err) {
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-        error_propagate(errp, local_err);
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-        goto out;
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-    }
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+    state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
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+                                  bs, target_bs, aio_context,
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+                                  common->block_job_txn, errp);
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-out:
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     aio_context_release(aio_context);
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 }
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@@ -3695,41 +3689,13 @@ XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
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     return bdrv_get_xdbg_block_graph(errp);
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 }
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-BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
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-                             Error **errp)
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+void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
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 {
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-    BlockDriverState *bs;
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-    BlockDriverState *target_bs;
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-    AioContext *aio_context;
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-    BlockJob *job;
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-
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-    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
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-    if (!bs) {
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-        return NULL;
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-    }
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-
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-    target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
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-    if (!target_bs) {
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-        return NULL;
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-    }
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-
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-    aio_context = bdrv_get_aio_context(bs);
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-    aio_context_acquire(aio_context);
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-
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-    job = do_backup_common(qapi_BlockdevBackup_base(backup),
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-                           bs, target_bs, aio_context, txn, errp);
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-
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-    aio_context_release(aio_context);
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-    return job;
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-}
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-
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-void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
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-{
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-    BlockJob *job;
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-    job = do_blockdev_backup(arg, NULL, errp);
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-    if (job) {
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-        job_start(&job->job);
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-    }
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+    TransactionAction action = {
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+        .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
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+        .u.blockdev_backup.data = backup,
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+    };
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+    blockdev_do_action(&action, errp);
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 }
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 /* Parameter check and block job starting for drive mirroring.
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-- 
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1.8.3.1
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