From 9fe075332111e814639fa05de723e68f5e204d71 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Wed, 6 Mar 2024 14:10:54 +0100 Subject: [PATCH] blockdev: Fix block_resize error reporting for op blockers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When block_resize() runs into an op blocker, it creates an error like this: error_setg(errp, "Device '%s' is in use", device); Trouble is @device can be null. My system formats null as "(null)", but other systems might crash. Reproducer: 1. Create two block devices -> {"execute": "blockdev-add", "arguments": {"driver": "file", "node-name": "blk0", "filename": "64k.img"}} <- {"return": {}} -> {"execute": "blockdev-add", "arguments": {"driver": "file", "node-name": "blk1", "filename": "m.img"}} <- {"return": {}} 2. Put a blocker on one them -> {"execute": "blockdev-mirror", "arguments": {"job-id": "job0", "device": "blk0", "target": "blk1", "sync": "full"}} {"return": {}} -> {"execute": "job-pause", "arguments": {"id": "job0"}} {"return": {}} -> {"execute": "job-complete", "arguments": {"id": "job0"}} {"return": {}} Note: job events elided for brevity. 3. Attempt to resize -> {"execute": "block_resize", "arguments": {"node-name": "blk1", "size":32768}} <- {"error": {"class": "GenericError", "desc": "Device '(null)' is in use"}} Broken when commit 3b1dbd11a60 made @device optional. Fixed in commit ed3d2ec98a3 (block: Add errp to b{lk,drv}_truncate()), except for this one instance. Fix it by using the error message provided by the op blocker instead, so it fails like this: <- {"error": {"class": "GenericError", "desc": "Node 'blk1' is busy: block device is in use by block job: mirror"}} Fixes: 3b1dbd11a60d (qmp: Allow block_resize to manipulate bs graph nodes.) Signed-off-by: Markus Armbruster Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Michael Tokarev Signed-off-by: Michael Tokarev --- blockdev.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/blockdev.c b/blockdev.c index f8bb0932f8..d8fb3399f5 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2252,8 +2252,7 @@ void coroutine_fn qmp_block_resize(const char *device, const char *node_name, } bdrv_graph_co_rdlock(); - if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) { - error_setg(errp, QERR_DEVICE_IN_USE, device); + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, errp)) { bdrv_graph_co_rdunlock(); return; }