qemu-img commit: Report errors while closing the image
blk_unref() can't report any errors that happen while closing the image.
For example, if qcow2 hits an -ENOSPC error while writing out dirty
bitmaps when it's closed, it prints error messages to stderr, but
'qemu-img commit' won't see any error return value and will therefore
look successful with exit code 0.
In order to fix this, manually inactivate the image first before calling
blk_unref(). This already performs the operations that would be most
likely to fail while closing the image, but it can still return errors.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230112191454.169353-3-kwolf@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-img.c b/qemu-img.c
index 7e73c5c..7b9ba99 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -450,6 +450,11 @@
blk = img_open_file(filename, NULL, fmt, flags, writethrough, quiet,
force_share);
}
+
+ if (blk) {
+ blk_set_force_allow_inactivate(blk);
+ }
+
return blk;
}
@@ -1120,6 +1125,14 @@
done:
qemu_progress_end();
+ /*
+ * Manually inactivate the image first because this way we can know whether
+ * an error occurred. blk_unref() doesn't tell us about failures.
+ */
+ ret = bdrv_inactivate_all();
+ if (ret < 0 && !local_err) {
+ error_setg_errno(&local_err, -ret, "Error while closing the image");
+ }
blk_unref(blk);
if (local_err) {
