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[Qemu-devel] [PULL 20/31] block: Add bdrv_has_blk()
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 20/31] block: Add bdrv_has_blk() |
Date: |
Thu, 19 May 2016 17:21:58 +0200 |
In many cases we just want to know whether a BDS has at least one BB
attached, without needing to know the exact BB that is attached. In
contrast to bs->blk, this is still a valid question when more than one
BB can be attached, so just answer it by checking the parents list.
Signed-off-by: Kevin Wolf <address@hidden>
Reviewed-by: Max Reitz <address@hidden>
---
block/block-backend.c | 17 +++++++++++++++++
include/sysemu/block-backend.h | 1 +
2 files changed, 18 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index 8d6fc77..9dcac97 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -395,6 +395,23 @@ BlockDriverState *blk_bs(BlockBackend *blk)
}
/*
+ * Returns true if @bs has an associated BlockBackend.
+ */
+bool bdrv_has_blk(BlockDriverState *bs)
+{
+ BdrvChild *child;
+ QLIST_FOREACH(child, &bs->parents, next_parent) {
+ if (child->role == &child_root) {
+ assert(bs->blk);
+ return true;
+ }
+ }
+
+ assert(!bs->blk);
+ return false;
+}
+
+/*
* Return @blk's DriveInfo if any, else null.
*/
DriveInfo *blk_legacy_dinfo(BlockBackend *blk)
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 79f39b8..44a222d 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -99,6 +99,7 @@ BlockBackend *blk_by_public(BlockBackendPublic *public);
BlockDriverState *blk_bs(BlockBackend *blk);
void blk_remove_bs(BlockBackend *blk);
void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
+bool bdrv_has_blk(BlockDriverState *bs);
void blk_set_allow_write_beyond_eof(BlockBackend *blk, bool allow);
void blk_iostatus_enable(BlockBackend *blk);
--
1.8.3.1
- [Qemu-devel] [PULL 17/31] blockjob: Don't set iostatus of target, (continued)
- [Qemu-devel] [PULL 17/31] blockjob: Don't set iostatus of target, Kevin Wolf, 2016/05/19
- [Qemu-devel] [PULL 19/31] block: Remove bdrv_aio_multiwrite(), Kevin Wolf, 2016/05/19
- [Qemu-devel] [PULL 26/31] qcow2: Fix write_zeroes with partially allocated backing file cluster, Kevin Wolf, 2016/05/19
- [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Kevin Wolf, 2016/05/19
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Paolo Bonzini, 2016/05/20
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Kevin Wolf, 2016/05/20
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Kevin Wolf, 2016/05/20
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Paolo Bonzini, 2016/05/20
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Kevin Wolf, 2016/05/20
- Re: [Qemu-devel] [PULL 21/31] block: Avoid bs->blk in bdrv_next(), Paolo Bonzini, 2016/05/20
[Qemu-devel] [PULL 20/31] block: Add bdrv_has_blk(),
Kevin Wolf <=
[Qemu-devel] [PULL 22/31] block: Don't return throttling info in query-named-block-nodes, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 24/31] block: Propagate AioContext change to all children, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 30/31] qemu-iotests: Simplify 109 with unaligned qemu-img compare, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 27/31] qemu-iotests: Some more write_zeroes tests, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 23/31] block: Remove BlockDriverState.blk, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 31/31] qemu-iotests: Fix regression in 136 on aio_read invalid, Kevin Wolf, 2016/05/19
[Qemu-devel] [PULL 29/31] qemu-io: Fix recent UI updates, Kevin Wolf, 2016/05/19
Re: [Qemu-devel] [PULL 00/31] Block layer patches, Peter Maydell, 2016/05/19
[Qemu-devel] [PULL 00/31] Block layer patches, Kevin Wolf, 2016/05/25