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[Qemu-devel] [PATCH V4 4/5] block: Add backing file loop check in change
From: |
Xu Wang |
Subject: |
[Qemu-devel] [PATCH V4 4/5] block: Add backing file loop check in change_backing_file() |
Date: |
Mon, 22 Jul 2013 04:05:48 -0400 |
Backing file loop should be checked before calling change_backing_
file(). If loop appeared, this calling should be stopped and an
error was printed.
Signed-off-by: Xu Wang <address@hidden>
---
block.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/block.c b/block.c
index 9daf63c..d996524 100644
--- a/block.c
+++ b/block.c
@@ -1967,6 +1967,13 @@ int bdrv_change_backing_file(BlockDriverState *bs,
return -EINVAL;
}
+ /* Check if loop exists in backing files chain after changed */
+ if (bdrv_backing_file_loop_check(bs->filename,
+ bs->drv ? bs->drv->format_name : NULL,
+ backing_file, backing_fmt)) {
+ return -EIO;
+ }
+
if (drv->bdrv_change_backing_file != NULL) {
ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
} else {
--
1.8.1.4