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block: in commit, determine base image from the top image

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This simplifies some code and error checking, and also fixes a bug.

bdrv_find_backing_image() should only be passed absolute filenames,
or filenames relative to the chain.  In the QMP message handler for
block commit, when looking up the base do so from the determined top
image, so we know it is reachable from top.

Some of the error messages put out by block-commit have changed
slightly, which causes 2 tests cases for block-commit to fail.
This patch updates the test cases to look for the correct error
output.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2012-10-16 15:49:10 -04:00 • committed by Kevin Wolf
parent b1b1d783ea
commit d5208c45be
3 changed files with 13 additions and 21 deletions
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9
block/commit.c
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@ -211,15 +211,6 @@ void commit_start(BlockDriverState *bs, BlockDriverState *base,
return;
}
/* top and base may be valid, but let's make sure that base is reachable
* from top */
if (bdrv_find_backing_image(top, base->filename) != base) {
error_setg(errp,
"Base (%s) is not reachable from top (%s)",
base->filename, top->filename);
return;
}
overlay_bs = bdrv_find_overlay(bs, top);
if (overlay_bs == NULL) {