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authorVivek Goyal <vgoyal@redhat.com>2016-07-01 10:02:44 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-28 07:23:43 +0200
commit7eaa995c75bd23b57163541c3285a2c984018b7e (patch)
parent0f9a6d88cd9f3b16a86639bd652202fe27096b18 (diff)
ovl: warn instead of error if d_type is not supported
commit e7c0b5991dd1be7b6f6dc2b54a15a0f47b64b007 upstream. overlay needs underlying fs to support d_type. Recently I put in a patch in to detect this condition and started failing mount if underlying fs did not support d_type. But this breaks existing configurations over kernel upgrade. Those who are running docker (partially broken configuration) with xfs not supporting d_type, are surprised that after kernel upgrade docker does not run anymore. https://github.com/docker/docker/issues/22937#issuecomment-229881315 So instead of erroring out, detect broken configuration and warn about it. This should allow existing docker setups to continue working after kernel upgrade. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: 45aebeaf4f67 ("ovl: Ensure upper filesystem supports d_type") Cc: <stable@vger.kernel.org> 4.6 Signed-off-by: SZ Lin (林上智) <sz.lin@moxa.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index fd21c5f74fba..0035cb80ecd1 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1066,11 +1066,13 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
if (err < 0)
goto out_put_workdir;
- if (!err) {
- pr_err("overlayfs: upper fs needs to support d_type.\n");
- err = -EINVAL;
- 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");