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[Qemu-devel] [PATCH V4 1/3] block: create bdrv_get_backing_file_depth()
From: |
benoit . canet |
Subject: |
[Qemu-devel] [PATCH V4 1/3] block: create bdrv_get_backing_file_depth() |
Date: |
Thu, 26 Jul 2012 13:16:04 +0200 |
From: BenoƮt Canet <address@hidden>
Create bdrv_get_backing_file_depth() in order to be able to show
in QMP and HMP how many ancestors backing an image a block device
have.
Signed-off-by: Benoit Canet <address@hidden>
---
block.c | 13 +++++++++++++
block.h | 1 +
2 files changed, 14 insertions(+)
diff --git a/block.c b/block.c
index ce7eb8f..22ebe49 100644
--- a/block.c
+++ b/block.c
@@ -2754,6 +2754,19 @@ BlockDriverState
*bdrv_find_backing_image(BlockDriverState *bs,
return NULL;
}
+int bdrv_get_backing_file_depth(BlockDriverState *bs)
+{
+ if (!bs->drv) {
+ return 0;
+ }
+
+ if (!bs->backing_hd) {
+ return 0;
+ }
+
+ return 1 + bdrv_get_backing_file_depth(bs->backing_hd);
+}
+
#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 c89590d..650d872 100644
--- a/block.h
+++ b/block.h
@@ -174,6 +174,7 @@ int coroutine_fn
bdrv_co_is_allocated_above(BlockDriverState *top,
int nb_sectors, int *pnum);
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
const char *backing_file);
+int bdrv_get_backing_file_depth(BlockDriverState *bs);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
--
1.7.9.5