From 5f8d3f29a30c6b872780dd8cbba5b0d74a5b9c57 Mon Sep 17 00:00:00 2001
From: Jeffrey Cody <jcody@redhat.com>
Date: Wed, 21 Mar 2012 21:55:12 +0100
Subject: [PATCH 45/55] block: add bdrv_find_backing_image
RH-Author: Jeffrey Cody <jcody@redhat.com>
Message-id: <55db0a71e895d5f0ef6106c4108d8c151cb37202.1332362400.git.jcody@redhat.com>
Patchwork-id: 38895
O-Subject: [RHEL6.3 qemu-kvm PATCH v8 45/54] block: add bdrv_find_backing_image
Bugzilla: 582475
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
From: Marcelo Tosatti <mtosatti@redhat.com>
Add bdrv_find_backing_image: given a BlockDriverState pointer, and an id,
traverse the backing image chain to locate the id.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit e8a6bb9caa5379b0fcaca4e0a12aa6d2913961f3)
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
---
block.c | 18 ++++++++++++++++++
block.h | 2 ++
2 files changed, 20 insertions(+), 0 deletions(-)
Signed-off-by: Michal Novotny <minovotn@redhat.com>
---
block.c | 18 ++++++++++++++++++
block.h | 2 ++
2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index f74f84b..0aaab0b 100644
--- a/block.c
+++ b/block.c
@@ -2468,6 +2468,24 @@ int bdrv_snapshot_list(BlockDriverState *bs,
return drv->bdrv_snapshot_list(bs, psn_info);
}
+BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
+ const char *backing_file)
+{
+ if (!bs->drv) {
+ return NULL;
+ }
+
+ if (bs->backing_hd) {
+ if (strcmp(bs->backing_file, backing_file) == 0) {
+ return bs->backing_hd;
+ } else {
+ return bdrv_find_backing_image(bs->backing_hd, backing_file);
+ }
+ }
+
+ return NULL;
+}
+
#define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size)
diff --git a/block.h b/block.h
index 5567d7c..c682ea7 100644
--- a/block.h
+++ b/block.h
@@ -152,6 +152,8 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
+BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
+ const char *backing_file);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
--
1.7.7.6