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[v3,2/4] block: Add blk_get_refcnt()

Message ID 81a6af9a9455104f63712a6689a9eb3bd4be6784.1445600995.git.berto@igalia.com
State New
Headers show

Commit Message

Alberto Garcia Oct. 23, 2015, 12:03 p.m. UTC 
This function returns the reference count of a given BlockBackend.
For convenience, it returns 0 if the BlockBackend pointer is NULL.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block/block-backend.c          | 5 +++++
 include/sysemu/block-backend.h | 1 +
 2 files changed, 6 insertions(+)
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Patch

diff --git a/block/block-backend.c b/block/block-backend.c
index 10e4d71..5f1e395 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -189,6 +189,11 @@  static void drive_info_del(DriveInfo *dinfo)
     g_free(dinfo);
 }
 
+int blk_get_refcnt(BlockBackend *blk)
+{
+    return blk ? blk->refcnt : 0;
+}
+
 /*
  * Increment @blk's reference count.
  * @blk must not be null.
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 14a6d32..8a6413d 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -65,6 +65,7 @@  BlockBackend *blk_new_with_bs(const char *name, Error **errp);
 BlockBackend *blk_new_open(const char *name, const char *filename,
                            const char *reference, QDict *options, int flags,
                            Error **errp);
+int blk_get_refcnt(BlockBackend *blk);
 void blk_ref(BlockBackend *blk);
 void blk_unref(BlockBackend *blk);
 const char *blk_name(BlockBackend *blk);