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[Qemu-devel] [PATCH v4 11/15] block: add bdrv_find_backing_image
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v4 11/15] block: add bdrv_find_backing_image |
Date: |
Fri, 6 Jan 2012 14:01:37 +0000 |
From: Marcelo Tosatti <address@hidden>
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 <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
block.c | 17 +++++++++++++++++
block.h | 1 +
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index 5bfaa3a..9b688a0 100644
--- a/block.c
+++ b/block.c
@@ -2614,6 +2614,23 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs,
return -ENOTSUP;
}
+BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id)
+{
+ if (!bs->drv) {
+ return NULL;
+ }
+
+ if (bs->backing_hd) {
+ if (strcmp(bs->backing_file, id) == 0) {
+ return bs->backing_hd;
+ } else {
+ return bdrv_find_backing_image(bs->backing_hd, id);
+ }
+ }
+
+ 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 51b90c7..a1d9b56 100644
--- a/block.h
+++ b/block.h
@@ -153,6 +153,7 @@ int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors);
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
*id);
int bdrv_truncate(BlockDriverState *bs, int64_t offset);
int64_t bdrv_getlength(BlockDriverState *bs);
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
--
1.7.7.3
[Qemu-devel] [PATCH v4 15/15] test: add image streaming test cases, Stefan Hajnoczi, 2012/01/06
[Qemu-devel] [PATCH v4 13/15] block stream: add support for partial streaming, Stefan Hajnoczi, 2012/01/06