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[Qemu-devel] [PATCH v5 11/15] block: add bdrv_find_backing_image
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v5 11/15] block: add bdrv_find_backing_image |
Date: |
Fri, 13 Jan 2012 13:14:13 +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 | 18 ++++++++++++++++++
block.h | 2 ++
2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index d588ee8..d8ae716 100644
--- a/block.c
+++ b/block.c
@@ -2614,6 +2614,24 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs,
return -ENOTSUP;
}
+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 51b90c7..05c8c83 100644
--- a/block.h
+++ b/block.h
@@ -153,6 +153,8 @@ 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 *backing_file);
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
- Re: [Qemu-devel] [PATCH v5 01/15] coroutine: add co_sleep_ns() coroutine sleep function, (continued)
- [Qemu-devel] [PATCH v5 07/15] qmp: add block_job_set_speed command, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 14/15] docs: describe live block operations, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 11/15] block: add bdrv_find_backing_image,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH v5 10/15] blockdev: make image streaming safe across hotplug, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 12/15] add QERR_BASE_NOT_FOUND, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 08/15] qmp: add block_job_cancel command, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 06/15] qmp: add block_stream command, Stefan Hajnoczi, 2012/01/13
- [Qemu-devel] [PATCH v5 13/15] block: add support for partial streaming, Stefan Hajnoczi, 2012/01/13