[Qemu-block] [PATCH 0/3] Prefer bdrv_lookup_bs() to find BDS nodes

[Jeff Cody]

This series is on top of Alberto's "Add 'blockdev-snapshot' command" series

BlockBackend devices and BlockDriverState node-names occupy the same
namespace.  In addition, there are two methods that can be used in different
circumstances to look up a BlockDriverState: blk_by_name() and bdrv_find_node().

There is also a common interface, bdrv_lookup_bs(), that can look up either by
blk_by_name() or bdrv_find_node().

This makes bdrv_find_node() redundant for an external interface.  And in the
cases where we just want the underlying BDS for a BlockBackend device, it is
simpler to use bdrv_lookup_bs() instead of blk_by_name().

This series makes bdrv_find_node() static and internal to block.c as a helper
function, and attempts to simplify some code when we are looking just for the
BDS of a BlockBackend device.

Jeff Cody (3):
  block: Use bdrv_lookup_bs() instead of bdrv_find_node()
  block: make bdrv_find_node() static
  block: use bdrv_lookup_bs() over blk_by_name() for BDS only results

 block.c                 | 30 +++++++++---------
 block/block-backend.c   |  2 +-
 block/mirror.c          |  2 +-
 block/write-threshold.c |  2 +-
 blockdev.c              | 84 ++++++++++++++++++-------------------------------
 include/block/block.h   |  1 -
 migration/block.c       |  6 ++--
 7 files changed, 50 insertions(+), 77 deletions(-)

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1.9.3