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[Qemu-devel] [PATCH 1/2] qapi: support external bitmaps in block-dirty-b
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH 1/2] qapi: support external bitmaps in block-dirty-bitmap-merge |
Date: |
Thu, 16 May 2019 15:27:24 +0300 |
Add new optional parameter making possible to merge bitmaps from
different nodes. It is needed to maintain external snapshots during
incremental backup chain history.
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
qapi/block-core.json | 13 ++++++++++---
block/dirty-bitmap.c | 9 ++++++---
blockdev.c | 46 ++++++++++++++++++++++++++++++--------------
3 files changed, 48 insertions(+), 20 deletions(-)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 7ccbfff9d0..933b50771a 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2006,16 +2006,23 @@
##
# @BlockDirtyBitmapMerge:
#
-# @node: name of device/node which the bitmap is tracking
+# @node: name of device/node which the @target and @bitmaps bitmaps are
+# tracking
#
# @target: name of the destination dirty bitmap
#
-# @bitmaps: name(s) of the source dirty bitmap(s)
+# @bitmaps: name(s) of the source dirty bitmap(s). The field is optional
+# since 4.1.
+#
+# @external-bitmaps: additional list of source dirty bitmaps with specified
+# nodes, which allows merging bitmaps between different
+# nodes. (Since: 4.1)
#
# Since: 4.0
##
{ 'struct': 'BlockDirtyBitmapMerge',
- 'data': { 'node': 'str', 'target': 'str', 'bitmaps': ['str'] } }
+ 'data': { 'node': 'str', 'target': 'str', '*bitmaps': ['str'],
+ '*external-bitmaps': ['BlockDirtyBitmap'] } }
##
# @block-dirty-bitmap-add:
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 59e6ebb861..49646a30e6 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -816,10 +816,10 @@ void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const
BdrvDirtyBitmap *src,
{
bool ret;
- /* only bitmaps from one bds are supported */
- assert(dest->mutex == src->mutex);
-
qemu_mutex_lock(dest->mutex);
+ if (src->mutex != dest->mutex) {
+ qemu_mutex_lock(src->mutex);
+ }
if (bdrv_dirty_bitmap_check(dest, BDRV_BITMAP_DEFAULT, errp)) {
goto out;
@@ -845,4 +845,7 @@ void bdrv_merge_dirty_bitmap(BdrvDirtyBitmap *dest, const
BdrvDirtyBitmap *src,
out:
qemu_mutex_unlock(dest->mutex);
+ if (src->mutex != dest->mutex) {
+ qemu_mutex_unlock(src->mutex);
+ }
}
diff --git a/blockdev.c b/blockdev.c
index 79fbac8450..8d37ce5943 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2112,11 +2112,9 @@ static void
block_dirty_bitmap_disable_abort(BlkActionState *common)
}
}
-static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node,
- const char *target,
- strList *bitmaps,
- HBitmap **backup,
- Error **errp);
+static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(
+ const char *node, const char *target, strList *bitmaps,
+ BlockDirtyBitmapList *external_bitmaps, HBitmap **backup, Error
**errp);
static void block_dirty_bitmap_merge_prepare(BlkActionState *common,
Error **errp)
@@ -2132,8 +2130,9 @@ static void
block_dirty_bitmap_merge_prepare(BlkActionState *common,
action = common->action->u.block_dirty_bitmap_merge.data;
state->bitmap = do_block_dirty_bitmap_merge(action->node, action->target,
- action->bitmaps,
&state->backup,
- errp);
+ action->bitmaps,
+ action->external_bitmaps,
+ &state->backup, errp);
}
static void abort_prepare(BlkActionState *common, Error **errp)
@@ -2965,15 +2964,14 @@ void qmp_block_dirty_bitmap_disable(const char *node,
const char *name,
bdrv_disable_dirty_bitmap(bitmap);
}
-static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(const char *node,
- const char *target,
- strList *bitmaps,
- HBitmap **backup,
- Error **errp)
+static BdrvDirtyBitmap *do_block_dirty_bitmap_merge(
+ const char *node, const char *target, strList *bitmaps,
+ BlockDirtyBitmapList *external_bitmaps, HBitmap **backup, Error **errp)
{
BlockDriverState *bs;
BdrvDirtyBitmap *dst, *src, *anon;
strList *lst;
+ BlockDirtyBitmapList *ext_lst;
Error *local_err = NULL;
dst = block_dirty_bitmap_lookup(node, target, &bs, errp);
@@ -3003,6 +3001,22 @@ static BdrvDirtyBitmap
*do_block_dirty_bitmap_merge(const char *node,
}
}
+ for (ext_lst = external_bitmaps; ext_lst; ext_lst = ext_lst->next) {
+ src = block_dirty_bitmap_lookup(ext_lst->value->node,
+ ext_lst->value->name, NULL, errp);
+ if (!src) {
+ dst = NULL;
+ goto out;
+ }
+
+ bdrv_merge_dirty_bitmap(anon, src, NULL, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ dst = NULL;
+ goto out;
+ }
+ }
+
/* Merge into dst; dst is unchanged on failure. */
bdrv_merge_dirty_bitmap(dst, anon, backup, errp);
@@ -3012,9 +3026,13 @@ static BdrvDirtyBitmap
*do_block_dirty_bitmap_merge(const char *node,
}
void qmp_block_dirty_bitmap_merge(const char *node, const char *target,
- strList *bitmaps, Error **errp)
+ bool has_bitmaps, strList *bitmaps,
+ bool has_external_bitmaps,
+ BlockDirtyBitmapList *external_bitmaps,
+ Error **errp)
{
- do_block_dirty_bitmap_merge(node, target, bitmaps, NULL, errp);
+ do_block_dirty_bitmap_merge(node, target, bitmaps, external_bitmaps, NULL,
+ errp);
}
BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
--
2.18.0