linux-kernel - [PATCH RFC 3/6] exportfs: add open method

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Message-ID: <20241129-work-pidfs-file_handle-v1-3-87d803a42495@kernel.org>
Date: Fri, 29 Nov 2024 14:38:02 +0100
From: Christian Brauner <brauner@...nel.org>
To: Erin Shepherd <erin.shepherd@....eu>,
	Amir Goldstein <amir73il@...il.com>,
	Jeff Layton <jlayton@...nel.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	Chuck Lever <chuck.lever@...cle.com>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org
Subject: [PATCH RFC 3/6] exportfs: add open method

This allows filesystems such as pidfs to provide their custom open.

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 include/linux/exportfs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 4cc8801e50e395442f9e3ae69b6c9f04fa590ff9..c69b79b64466d5bc32ffe9b2796a388130fe72d8 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -10,6 +10,7 @@ struct inode;
 struct iomap;
 struct super_block;
 struct vfsmount;
+struct path;
 
 /* limit the handle size to NFSv4 handle size now */
 #define MAX_HANDLE_SZ 128
@@ -225,6 +226,9 @@ struct fid {
  *    is also a directory.  In the event that it cannot be found, or storage
  *    space cannot be allocated, a %ERR_PTR should be returned.
  *
+ * open:
+ *    Allow filesystems to specify a custom open function.
+ *
  * commit_metadata:
  *    @commit_metadata should commit metadata changes to stable storage.
  *
@@ -251,6 +255,7 @@ struct export_operations {
 			  bool write, u32 *device_generation);
 	int (*commit_blocks)(struct inode *inode, struct iomap *iomaps,
 			     int nr_iomaps, struct iattr *iattr);
+	struct file * (*open)(struct path *path, unsigned int oflags);
 #define	EXPORT_OP_NOWCC			(0x1) /* don't collect v3 wcc data */
 #define	EXPORT_OP_NOSUBTREECHK		(0x2) /* no subtree checking */
 #define	EXPORT_OP_CLOSE_BEFORE_UNLINK	(0x4) /* close files before unlink */

-- 
2.45.2