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 <kw...@redhat.com>
---
block/gluster.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/block/gluster.c b/block/gluster.c
index 4fd55a9cc5..5e300c96c8 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);
--
2.19.1
