From ae5e165d855dd978a461b22175531b07f54fb61f Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Mon, 29 Jan 2018 06:41:30 -0500
Subject: fs: new API for handling inode->i_version

Add a documentation blob that explains what the i_version field is, how
it is expected to work, and how it is currently implemented by various
filesystems.

We already have inode_inc_iversion. Add several other functions for
manipulating and accessing the i_version counter. For now, the
implementation is trivial and basically works the way that all of the
open-coded i_version accesses work today.

Future patches will convert existing users of i_version to use the new
API, and then convert the backend implementation to do things more
efficiently.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/inode.c | 1 +
 fs/ext4/namei.c | 1 +
 2 files changed, 2 insertions(+)

(limited to 'fs/ext4')

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 7df2c5644e59..fa5d8bc52d2d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -39,6 +39,7 @@
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/iomap.h>
+#include <linux/iversion.h>
 
 #include "ext4_jbd2.h"
 #include "xattr.h"
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 798b3ac680db..bcf0dff517be 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -34,6 +34,7 @@
 #include <linux/quotaops.h>
 #include <linux/buffer_head.h>
 #include <linux/bio.h>
+#include <linux/iversion.h>
 #include "ext4.h"
 #include "ext4_jbd2.h"
 
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