[v2] fs: require filesystems to explicitly opt-in to nfsd export support

[PATCH v2 17/31] ovl: add EXPORT_OP_STABLE_HANDLES flag to export operations

Posted by Jeff Layton 2 weeks, 5 days ago

Add the EXPORT_OP_STABLE_HANDLES flag to overlayfs export operations to
indicate that this filesystem can be exported via NFS.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/overlayfs/export.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 83f80fdb156749e65a4ea0ab708cbff338dacdad..18c6aee9dd23bb450dadbe8eef9360ea268241ff 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -865,6 +865,7 @@ const struct export_operations ovl_export_operations = {
 	.fh_to_parent	= ovl_fh_to_parent,
 	.get_name	= ovl_get_name,
 	.get_parent	= ovl_get_parent,
+	.flags		= EXPORT_OP_STABLE_HANDLES,
 };
 
 /* encode_fh() encodes non-decodable file handles with nfs_export=off */

-- 
2.52.0

Re: [PATCH v2 17/31] ovl: add EXPORT_OP_STABLE_HANDLES flag to export operations

Posted by Amir Goldstein 2 weeks, 5 days ago

On Mon, Jan 19, 2026 at 5:29 PM Jeff Layton <jlayton@kernel.org> wrote:
>
> Add the EXPORT_OP_STABLE_HANDLES flag to overlayfs export operations to
> indicate that this filesystem can be exported via NFS.
>
> Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>

> ---
>  fs/overlayfs/export.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
> index 83f80fdb156749e65a4ea0ab708cbff338dacdad..18c6aee9dd23bb450dadbe8eef9360ea268241ff 100644
> --- a/fs/overlayfs/export.c
> +++ b/fs/overlayfs/export.c
> @@ -865,6 +865,7 @@ const struct export_operations ovl_export_operations = {
>         .fh_to_parent   = ovl_fh_to_parent,
>         .get_name       = ovl_get_name,
>         .get_parent     = ovl_get_parent,
> +       .flags          = EXPORT_OP_STABLE_HANDLES,
>  };
>
>  /* encode_fh() encodes non-decodable file handles with nfs_export=off */
>
> --
> 2.52.0
>