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block: honor BDRV_O_ALLOW_RDWR when clearing bs->read_only 

The BDRV_O_ALLOW_RDWR flag allows / prohibits the changing of
the BDS 'read_only' state, but there are a few places where it
is ignored.  In the bdrv_set_read_only() helper, make sure to
honor the flag.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: be2e5fb2d285cbece2b6d06bed54a6f56520d251.1491597120.git.jcody@redhat.com
This commit is contained in:
Jeff Cody 2017-04-07 16:55:27 -04:00
parent e2b8247a32
commit d6fcdf06d9
1 changed files with 7 additions and 0 deletions
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7
block.c
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@ -201,6 +201,13 @@ int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp)
return -EINVAL;
}
/* Do not clear read_only if it is prohibited */
if (!read_only && !(bs->open_flags & BDRV_O_ALLOW_RDWR)) {
error_setg(errp, "Node '%s' is read only",
bdrv_get_device_or_node_name(bs));
return -EPERM;
}
bs->read_only = read_only;
return 0;
}