linux-kernel - [PATCH v2 1/3] pseudofs: add support for export

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Message-Id: <20241113-pidfs_fh-v2-1-9a4d28155a37@e43.eu>
Date: Wed, 13 Nov 2024 17:55:23 +0000
From: Erin Shepherd <erin.shepherd@....eu>
To: Christian Brauner <brauner@...nel.org>, 
 Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>, 
 Chuck Lever <chuck.lever@...cle.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>, Amir Goldstein <amir73il@...il.com>, 
 linux-nfs@...r.kernel.org, Erin Shepherd <erin.shepherd@....eu>
Subject: [PATCH v2 1/3] pseudofs: add support for export_ops

Pseudo-filesystems might reasonably wish to implement the export ops
(particularly for name_to_handle_at/open_by_handle_at); plumb this
through pseudo_fs_context

Reviewed-by: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Erin Shepherd <erin.shepherd@....eu>
---
 fs/libfs.c                | 1 +
 include/linux/pseudo_fs.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/libfs.c b/fs/libfs.c
index 46966fd8bcf9f042e85d0b66134e59fbef83abfd..698a2ddfd0cb94a8927d1d8a3bb3b3226d6d5476 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -669,6 +669,7 @@ static int pseudo_fs_fill_super(struct super_block *s, struct fs_context *fc)
 	s->s_blocksize_bits = PAGE_SHIFT;
 	s->s_magic = ctx->magic;
 	s->s_op = ctx->ops ?: &simple_super_operations;
+	s->s_export_op = ctx->eops;
 	s->s_xattr = ctx->xattr;
 	s->s_time_gran = 1;
 	root = new_inode(s);
diff --git a/include/linux/pseudo_fs.h b/include/linux/pseudo_fs.h
index 730f77381d55f1816ef14adf7dd2cf1d62bb912c..2503f7625d65e7b1fbe9e64d5abf06cd8f017b5f 100644
--- a/include/linux/pseudo_fs.h
+++ b/include/linux/pseudo_fs.h
@@ -5,6 +5,7 @@
 
 struct pseudo_fs_context {
 	const struct super_operations *ops;
+	const struct export_operations *eops;
 	const struct xattr_handler * const *xattr;
 	const struct dentry_operations *dops;
 	unsigned long magic;

-- 
2.46.1