From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34240) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cvpgY-0006vd-0p for qemu-devel@nongnu.org; Wed, 05 Apr 2017 14:29:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cvpgT-0002EJ-4L for qemu-devel@nongnu.org; Wed, 05 Apr 2017 14:29:38 -0400 From: Jeff Cody Date: Wed, 5 Apr 2017 14:28:48 -0400 Message-Id: In-Reply-To: References: In-Reply-To: References: Subject: [Qemu-devel] [PATCH for-2.10 6/9] block: use bdrv_try_set_read_only() during reopen List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, jsnow@redhat.com, stefanha@redhat.com, kwolf@redhat.com Signed-off-by: Jeff Cody --- block.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/block.c b/block.c index ad958b9..3245fae 100644 --- a/block.c +++ b/block.c @@ -2785,6 +2785,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, BlockDriver *drv; QemuOpts *opts; const char *value; + bool read_only; assert(reopen_state != NULL); assert(reopen_state->bs->drv != NULL); @@ -2813,12 +2814,13 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, qdict_put(reopen_state->options, "driver", qstring_from_str(value)); } - /* if we are to stay read-only, do not allow permission change - * to r/w */ - if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && - reopen_state->flags & BDRV_O_RDWR) { - error_setg(errp, "Node '%s' is read only", - bdrv_get_device_or_node_name(reopen_state->bs)); + /* If we are to stay read-only, do not allow permission change + * to r/w. Attempting to set to r/w may fail if either BDRV_O_ALLOW_RDWR is + * not set, or if the BDS still has copy_on_read enabled */ + read_only = !(reopen_state->bs->open_flags & BDRV_O_RDWR); + ret = bdrv_try_set_read_only(reopen_state->bs, read_only, &local_err); + if (local_err) { + error_propagate(errp, local_err); goto error; } -- 2.9.3