From: Kevin Shanahan <kmshanah@disenchant.net>
Date: Thu, 20 Sep 2012 23:20:22 +0000 (+0930)
Subject: blockdev: preserve readonly and snapshot states across media changes
X-Git-Tag: v1.2.1~13
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=513cdda198bac6c40e8847c8e8136ec974b67da7;p=thirdparty%2Fqemu.git

blockdev: preserve readonly and snapshot states across media changes

If readonly=on is given at device creation time, the ->readonly flag
needs to be set in the block driver state for this device so that
readonly-ness is preserved across media changes (qmp change command).
Similarly, to preserve the snapshot property requires ->open_flags to
be correct.

Signed-off-by: Kevin Shanahan <kmshanah@disenchant.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 80dd1aae3657a902d262f5d20a7a3c655b23705e)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---

diff --git a/blockdev.c b/blockdev.c
index 7c83baa353c..e5d450f0bb9 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -527,6 +527,8 @@ DriveInfo *drive_init(QemuOpts *opts, int default_to_scsi)
                      if_name[type], mediastr, unit_id);
     }
     dinfo->bdrv = bdrv_new(dinfo->id);
+    dinfo->bdrv->open_flags = snapshot ? BDRV_O_SNAPSHOT : 0;
+    dinfo->bdrv->read_only = ro;
     dinfo->devaddr = devaddr;
     dinfo->type = type;
     dinfo->bus = bus_id;