BlockDriverState lifecycle management is needed by future features such as
image fleecing and blockdev-add. This series adds reference count to
BlockDriverState.
The first two patches clean up two odd BlockDriverState use cases, so all code
uses bdrv_new() to create BlockDriverState instance.
Then implemented bdrv_ref() and bdrv_unref() to operate on refcnt: Initially,
refcnt is 1, which means bdrv_unref is effectively a bdrv_delete() here. So
patch 04 has a search and replace to convert bdrv_delete to bdrv_unref, before
bdrv_ref is used anywhere. 05~08 patches calls bdrv_ref for device attach,
block-migration and nbd.
The rule is: Either bdrv_ref() or bdrv_new() must have a matching
bdrv_unref() call, and the last matching bdrv_unref deletes the bs.
v3:
03: Removed unnecessary bdrv_close() call.
v2:
05: Removed: "block: use BlockDriverState refcnt for device attach/detach"
07: Fix xen_disk blk_disconnect() as it depended on device attach refcnt.
Fam Zheng (7):
vvfat: use bdrv_new() to allocate BlockDriverState
iscsi: use bdrv_new() instead of stack structure
block: implement reference count for BlockDriverState
block: make bdrv_delete() static
migration: omit drive ref as we have bdrv_ref now
xen_disk: simplify blk_disconnect with refcnt
nbd: use BlockDriverState refcnt
block-migration.c | 4 ++--
block.c | 44 +++++++++++++++++++++++++++++++++-----------
block/backup.c | 2 +-
block/blkverify.c | 4 ++--
block/cow.c | 2 +-
block/iscsi.c | 14 +++++++-------
block/mirror.c | 2 +-
block/qcow.c | 2 +-
block/qcow2.c | 2 +-
block/qed.c | 2 +-
block/sheepdog.c | 6 +++---
block/snapshot.c | 2 +-
block/stream.c | 2 +-
block/vmdk.c | 10 +++++-----
block/vvfat.c | 6 +++---
blockdev-nbd.c | 10 +---------
blockdev.c | 14 +++++++-------
hw/block/xen_disk.c | 13 ++++++-------
include/block/block.h | 3 ++-
include/block/block_int.h | 1 +
nbd.c | 5 +++++
qemu-img.c | 26 +++++++++++++-------------
qemu-io.c | 6 +++---
23 files changed, 101 insertions(+), 81 deletions(-)
--
1.8.3.4
