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Blame SOURCES/kvm-qmp-transaction-support-for-x-block-dirty-bitmap-ena.patch

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From f694daf74067ada6720659a7133224f727f98ed3 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 18 Jul 2018 22:54:39 +0200
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Subject: [PATCH 221/268] qmp: transaction support for
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 x-block-dirty-bitmap-enable/disable
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-4-jsnow@redhat.com>
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Patchwork-id: 81410
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 03/35] qmp: transaction support for x-block-dirty-bitmap-enable/disable
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Bugzilla: 1207657
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Message-id: 20180606182449.1607-4-jsnow@redhat.com
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[Added x- prefix. --js]
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit c6490447402f574bbe45f45c318e0bdd19121baf)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 blockdev.c            | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++-
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 qapi/transaction.json |  4 +++
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 2 files changed, 84 insertions(+), 1 deletion(-)
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diff --git a/blockdev.c b/blockdev.c
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index 9e435f4..b74b7d4 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -2053,6 +2053,7 @@ typedef struct BlockDirtyBitmapState {
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     BlockDriverState *bs;
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     HBitmap *backup;
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     bool prepared;
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+    bool was_enabled;
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 } BlockDirtyBitmapState;
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 static void block_dirty_bitmap_add_prepare(BlkActionState *common,
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@@ -2152,6 +2153,74 @@ static void block_dirty_bitmap_clear_commit(BlkActionState *common)
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     hbitmap_free(state->backup);
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 }
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+static void block_dirty_bitmap_enable_prepare(BlkActionState *common,
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+                                              Error **errp)
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+{
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+    BlockDirtyBitmap *action;
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+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
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+                                             common, common);
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+
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+    if (action_check_completion_mode(common, errp) < 0) {
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+        return;
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+    }
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+
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+    action = common->action->u.x_block_dirty_bitmap_enable.data;
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+    state->bitmap = block_dirty_bitmap_lookup(action->node,
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+                                              action->name,
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+                                              NULL,
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+                                              errp);
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+    if (!state->bitmap) {
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+        return;
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+    }
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+
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+    state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
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+    bdrv_enable_dirty_bitmap(state->bitmap);
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+}
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+
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+static void block_dirty_bitmap_enable_abort(BlkActionState *common)
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+{
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+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
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+                                             common, common);
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+
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+    if (!state->was_enabled) {
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+        bdrv_disable_dirty_bitmap(state->bitmap);
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+    }
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+}
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+
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+static void block_dirty_bitmap_disable_prepare(BlkActionState *common,
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+                                               Error **errp)
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+{
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+    BlockDirtyBitmap *action;
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+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
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+                                             common, common);
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+
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+    if (action_check_completion_mode(common, errp) < 0) {
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+        return;
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+    }
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+
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+    action = common->action->u.x_block_dirty_bitmap_disable.data;
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+    state->bitmap = block_dirty_bitmap_lookup(action->node,
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+                                              action->name,
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+                                              NULL,
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+                                              errp);
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+    if (!state->bitmap) {
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+        return;
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+    }
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+
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+    state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
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+    bdrv_disable_dirty_bitmap(state->bitmap);
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+}
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+
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+static void block_dirty_bitmap_disable_abort(BlkActionState *common)
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+{
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+    BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
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+                                             common, common);
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+
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+    if (state->was_enabled) {
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+        bdrv_enable_dirty_bitmap(state->bitmap);
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+    }
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+}
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+
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 static void abort_prepare(BlkActionState *common, Error **errp)
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 {
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     error_setg(errp, "Transaction aborted using Abort action");
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@@ -2212,7 +2281,17 @@ static const BlkActionOps actions[] = {
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         .prepare = block_dirty_bitmap_clear_prepare,
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         .commit = block_dirty_bitmap_clear_commit,
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         .abort = block_dirty_bitmap_clear_abort,
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-    }
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+    },
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+    [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_ENABLE] = {
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+        .instance_size = sizeof(BlockDirtyBitmapState),
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+        .prepare = block_dirty_bitmap_enable_prepare,
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+        .abort = block_dirty_bitmap_enable_abort,
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+    },
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+    [TRANSACTION_ACTION_KIND_X_BLOCK_DIRTY_BITMAP_DISABLE] = {
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+        .instance_size = sizeof(BlockDirtyBitmapState),
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+        .prepare = block_dirty_bitmap_disable_prepare,
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+        .abort = block_dirty_bitmap_disable_abort,
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+     }
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 };
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 /**
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diff --git a/qapi/transaction.json b/qapi/transaction.json
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index bd31279..d7e4274 100644
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--- a/qapi/transaction.json
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+++ b/qapi/transaction.json
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@@ -46,6 +46,8 @@
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 # - @abort: since 1.6
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 # - @block-dirty-bitmap-add: since 2.5
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 # - @block-dirty-bitmap-clear: since 2.5
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+# - @x-block-dirty-bitmap-enable: since 3.0
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+# - @x-block-dirty-bitmap-disable: since 3.0
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 # - @blockdev-backup: since 2.3
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 # - @blockdev-snapshot: since 2.5
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 # - @blockdev-snapshot-internal-sync: since 1.7
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@@ -59,6 +61,8 @@
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        'abort': 'Abort',
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        'block-dirty-bitmap-add': 'BlockDirtyBitmapAdd',
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        'block-dirty-bitmap-clear': 'BlockDirtyBitmap',
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+       'x-block-dirty-bitmap-enable': 'BlockDirtyBitmap',
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+       'x-block-dirty-bitmap-disable': 'BlockDirtyBitmap',
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        'blockdev-backup': 'BlockdevBackup',
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        'blockdev-snapshot': 'BlockdevSnapshot',
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        'blockdev-snapshot-internal-sync': 'BlockdevSnapshotInternal',
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-- 
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1.8.3.1
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