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-rw-r--r--fs/overlayfs/super.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index d70208c0de84..0035cb80ecd1 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1054,6 +1054,26 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_flags |= MS_RDONLY;
ufs->workdir = NULL;
}
+
+ /*
+ * Upper should support d_type, else whiteouts are visible.
+ * Given workdir and upper are on same fs, we can do
+ * iterate_dir() on workdir. This check requires successful
+ * creation of workdir in previous step.
+ */
+ if (ufs->workdir) {
+ err = ovl_check_d_type_supported(&workpath);
+ if (err < 0)
+ goto out_put_workdir;
+
+ /*
+ * We allowed this configuration and don't want to
+ * break users over kernel upgrade. So warn instead
+ * of erroring out.
+ */
+ if (!err)
+ pr_warn("overlayfs: upper fs needs to support d_type.\n");
+ }
}
err = -ENOMEM;