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[PATCH 12/21] block/copy-before-write: bdrv_cbw_append(): replace child
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH 12/21] block/copy-before-write: bdrv_cbw_append(): replace child at last |
Date: |
Mon, 17 May 2021 09:44:19 +0300 |
Refactor the function to replace child at last. Thus we don't need to
revert it and code is simplified.
block-copy state initilization being done before replacing the child
doesn't need any drained section.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
block/copy-before-write.c | 33 +++++++++++----------------------
1 file changed, 11 insertions(+), 22 deletions(-)
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index 2f06a524b8..35a9aa163d 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -172,7 +172,6 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
int ret;
BDRVCopyBeforeWriteState *state;
BlockDriverState *top;
- bool appended = false;
assert(source->total_sectors == target->total_sectors);
@@ -197,8 +196,7 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
if (!state->target) {
error_prepend(errp, "Cannot attach target child: ");
bdrv_unref(target);
- bdrv_unref(top);
- return NULL;
+ goto fail;
}
bdrv_ref(source);
@@ -208,18 +206,8 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState *source,
if (!top->file) {
error_prepend(errp, "Cannot attach file child: ");
bdrv_unref(source);
- bdrv_unref(top);
- return NULL;
- }
-
- bdrv_drained_begin(source);
-
- ret = bdrv_replace_node(source, top, errp);
- if (ret < 0) {
- error_prepend(errp, "Cannot append copy-before-write filter: ");
goto fail;
}
- appended = true;
state->bcs = block_copy_state_new(top->file, state->target, false,
compress,
errp);
@@ -227,21 +215,22 @@ BlockDriverState *bdrv_cbw_append(BlockDriverState
*source,
error_prepend(errp, "Cannot create block-copy-state: ");
goto fail;
}
- *bcs = state->bcs;
+ bdrv_drained_begin(source);
+ ret = bdrv_replace_node(source, top, errp);
bdrv_drained_end(source);
+ if (ret < 0) {
+ error_prepend(errp, "Cannot append copy-before-write filter: ");
+ goto fail;
+ }
+
+ *bcs = state->bcs;
return top;
fail:
- if (appended) {
- bdrv_cbw_drop(top);
- } else {
- bdrv_unref(top);
- }
-
- bdrv_drained_end(source);
-
+ block_copy_state_free(state->bcs);
+ bdrv_unref(top);
return NULL;
}
--
2.29.2
- [PATCH 10/21] block/copy-before-write: relax permission requirements when no parents, (continued)
[PATCH 06/21] block/backup: drop support for copy_range, Vladimir Sementsov-Ogievskiy, 2021/05/17
[PATCH 12/21] block/copy-before-write: bdrv_cbw_append(): replace child at last,
Vladimir Sementsov-Ogievskiy <=
[PATCH 11/21] block/copy-before-write: use file child instead of backing, Vladimir Sementsov-Ogievskiy, 2021/05/17
[PATCH 07/21] block-copy: always set BDRV_REQ_SERIALISING flag, Vladimir Sementsov-Ogievskiy, 2021/05/17
[PATCH 18/21] block/block-copy: make setting progress optional, Vladimir Sementsov-Ogievskiy, 2021/05/17
[PATCH 13/21] block/copy-before-write: introduce cbw_init(), Vladimir Sementsov-Ogievskiy, 2021/05/17