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[Qemu-devel] [PATCH 4/4] block: Propagate .drained_begin/end callbacks
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 4/4] block: Propagate .drained_begin/end callbacks |
Date: |
Mon, 23 May 2016 18:55:15 +0200 |
When draining intermediate nodes (i.e. nodes that aren't the root node
for at least one of their parents; with node references, the user can
always configure the graph to create this situation), we need to
propagate the .drained_begin/end callbacks all the way up to the root
for the drain to be effective.
Signed-off-by: Kevin Wolf <address@hidden>
---
block.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/block.c b/block.c
index 598624f..45cddd6 100644
--- a/block.c
+++ b/block.c
@@ -659,6 +659,18 @@ int bdrv_parse_cache_mode(const char *mode, int *flags,
bool *writethrough)
return 0;
}
+static void bdrv_child_cb_drained_begin(BdrvChild *child)
+{
+ BlockDriverState *bs = child->opaque;
+ bdrv_drained_begin(bs);
+}
+
+static void bdrv_child_cb_drained_end(BdrvChild *child)
+{
+ BlockDriverState *bs = child->opaque;
+ bdrv_drained_end(bs);
+}
+
/*
* Returns the options and flags that a temporary snapshot should get, based on
* the originally requested flags (the originally requested image will have
@@ -705,6 +717,8 @@ static void bdrv_inherited_options(int *child_flags, QDict
*child_options,
const BdrvChildRole child_file = {
.inherit_options = bdrv_inherited_options,
+ .drained_begin = bdrv_child_cb_drained_begin,
+ .drained_end = bdrv_child_cb_drained_end,
};
/*
@@ -723,6 +737,8 @@ static void bdrv_inherited_fmt_options(int *child_flags,
QDict *child_options,
const BdrvChildRole child_format = {
.inherit_options = bdrv_inherited_fmt_options,
+ .drained_begin = bdrv_child_cb_drained_begin,
+ .drained_end = bdrv_child_cb_drained_end,
};
/*
@@ -750,6 +766,8 @@ static void bdrv_backing_options(int *child_flags, QDict
*child_options,
static const BdrvChildRole child_backing = {
.inherit_options = bdrv_backing_options,
+ .drained_begin = bdrv_child_cb_drained_begin,
+ .drained_end = bdrv_child_cb_drained_end,
};
static int bdrv_open_flags(BlockDriverState *bs, int flags)
@@ -1195,7 +1213,7 @@ BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
const BdrvChildRole *child_role)
{
BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role,
- NULL);
+ parent_bs);
QLIST_INSERT_HEAD(&parent_bs->children, child, next);
return child;
}
--
1.8.3.1
- [Qemu-devel] [PATCH 0/4] block: BdrvChildRole.drained_begin/end fixes, Kevin Wolf, 2016/05/23
- [Qemu-devel] [PATCH 1/4] block: Introduce bdrv_replace_child(), Kevin Wolf, 2016/05/23
- [Qemu-devel] [PATCH 2/4] block: Make bdrv_drain() use bdrv_drained_begin/end(), Kevin Wolf, 2016/05/23
- [Qemu-devel] [PATCH 4/4] block: Propagate .drained_begin/end callbacks,
Kevin Wolf <=
- [Qemu-devel] [PATCH 3/4] block: Fix reconfiguring graph with drained nodes, Kevin Wolf, 2016/05/23
- Re: [Qemu-devel] [PATCH 0/4] block: BdrvChildRole.drained_begin/end fixes, Fam Zheng, 2016/05/23
- Re: [Qemu-devel] [PATCH 0/4] block: BdrvChildRole.drained_begin/end fixes, Kevin Wolf, 2016/05/24