[Why]
Currently, if metacopy is enabled via a module param/kernel config, then
the setting for redirect_dir is overriden, unless passed as a mount
option specifically. Despite this overriding, the redirect_dir option is
not printed when displaying the mount options (see /proc/mounts), so it
is hard for a user to know that it has happened.
[How]
A bit of code that does the overriding based on the mount options was
setting redirect_dir, but not updating the redirect_mode string. By
adding that update, the information is now printed (and the config
struct has the correct information in all places).
---
fs/overlayfs/super.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 5ec4fc2f5d7e..46fab4660bfe 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -598,6 +598,9 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
config->metacopy = false;
} else {
/* Automatically enable redirect otherwise. */
+ pr_info("overlayfs: enabling redirect_dir due to implicit metacopy=%d\n",
+ config->metacopy);
+ config->redirect_mode = "on";
config->redirect_follow = config->redirect_dir = true;
}
}
--
2.21.0
