This patch hides error about missing lowerdir if MS_SILENT is set.
We use mount(NULL, "/", "overlay", MS_SILENT, NULL) for testing support of
overlayfs: syscall returns -ENODEV if it's not supported. Otherwise kernel
automatically loads module and returns -EINVAL because lowerdir is missing.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
---
fs/overlayfs/super.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index bf8537c7f455..00e1d0b3abdd 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -840,7 +840,8 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
err = -EINVAL;
if (!ufs->config.lowerdir) {
- pr_err("overlayfs: missing 'lowerdir'\n");
+ if (!silent)
+ pr_err("overlayfs: missing 'lowerdir'\n");
goto out_free_config;
}
--
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