From 6508e23a5053680509754d719a19b04754e1fbdc Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 10 Jan 2019 12:44:38 +0000 Subject: [PATCH 08/14] gluster: Support auto-read-only option RH-Author: Kevin Wolf Message-id: <20190110124442.30132-9-kwolf@redhat.com> Patchwork-id: 83959 O-Subject: [RHEL-8.0 qemu-kvm PATCH 08/12] gluster: Support auto-read-only option Bugzilla: 1644996 RH-Acked-by: Max Reitz RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Eric Blake If read-only=off, but auto-read-only=on is given, open the file read-write if we have the permissions, but instead of erroring out for read-only files, just degrade to read-only. Signed-off-by: Kevin Wolf Reviewed-by: Niels de Vos (cherry picked from commit 54ea21bd16202c4a3e43c67b573b5d1aa2ec1c0c) Signed-off-by: Kevin Wolf Signed-off-by: Danilo C. L. de Paula --- block/gluster.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/block/gluster.c b/block/gluster.c index cecfe09..8c13002 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -849,8 +849,16 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options, qemu_gluster_parse_flags(bdrv_flags, &open_flags); s->fd = glfs_open(s->glfs, gconf->path, open_flags); - if (!s->fd) { - ret = -errno; + ret = s->fd ? 0 : -errno; + + if (ret == -EACCES || ret == -EROFS) { + /* Try to degrade to read-only, but if it doesn't work, still use the + * normal error message. */ + if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) { + open_flags = (open_flags & ~O_RDWR) | O_RDONLY; + s->fd = glfs_open(s->glfs, gconf->path, open_flags); + ret = s->fd ? 0 : -errno; + } } s->supports_seek_data = qemu_gluster_test_seek(s->fd); -- 1.8.3.1