From: Amir Goldstein <amir73il@xxxxxxxxx>
Overlayfs falls back to index=off if lower/upper fs does not support
file handles. We should do the same if upper fs does not support xattr.
The redirect_dir feature is implicitly disabled when upper fs does not
support xattr via the check in ovl_redirect_dir(). Make the feature
explicitly disabled in this case by emitting a warning at mount time
and setting redirect_dir to off so its true state is visible in
/proc/mounts.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/super.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 76440feb79f6..e9419faaa156 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -967,7 +967,9 @@ static int ovl_make_workdir(struct ovl_fs *ofs, struct path *workpath)
err = ovl_do_setxattr(ofs->workdir, OVL_XATTR_OPAQUE, "0", 1, 0);
if (err) {
ofs->noxattr = true;
- pr_warn("overlayfs: upper fs does not support xattr.\n");
+ ofs->config.redirect_dir = false;
+ ofs->config.index = false;
+ pr_warn("overlayfs: upper fs does not support xattr, falling back to redirect_dir=off, index=off and no opaque dir.\n");
} else {
vfs_removexattr(ofs->workdir, OVL_XATTR_OPAQUE);
}
--
2.13.6
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