From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
The i_version on NFS has pretty much opaque to the client, so we don't
want to give the low bit any special interpretation.
Define a new FS_PRIVATE_I_VERSION flag for filesystems that manage the
i_version on their own.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/nfs/export.c | 1 +
include/linux/exportfs.h | 1 +
include/linux/iversion.h | 4 ++++
3 files changed, 6 insertions(+)
diff --git a/fs/nfs/export.c b/fs/nfs/export.c
index 3430d6891e89..c2eb915a54ca 100644
--- a/fs/nfs/export.c
+++ b/fs/nfs/export.c
@@ -171,4 +171,5 @@ const struct export_operations nfs_export_ops = {
.encode_fh = nfs_encode_fh,
.fh_to_dentry = nfs_fh_to_dentry,
.get_parent = nfs_get_parent,
+ .fetch_iversion = inode_peek_iversion_raw,
};
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index 3ceb72b67a7a..6000121a201f 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -213,6 +213,7 @@ struct export_operations {
bool write, u32 *device_generation);
int (*commit_blocks)(struct inode *inode, struct iomap *iomaps,
int nr_iomaps, struct iattr *iattr);
+ u64 (*fetch_iversion)(const struct inode *);
};
extern int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
diff --git a/include/linux/iversion.h b/include/linux/iversion.h
index 2917ef990d43..481b3debf6bb 100644
--- a/include/linux/iversion.h
+++ b/include/linux/iversion.h
@@ -3,6 +3,7 @@
#define _LINUX_IVERSION_H
#include <linux/fs.h>
+#include <linux/exportfs.h>
/*
* The inode->i_version field:
@@ -306,6 +307,9 @@ inode_query_iversion(struct inode *inode)
{
u64 cur, old, new;
+ if (inode->i_sb->s_export_op->fetch_iversion)
+ return inode->i_sb->s_export_op->fetch_iversion(inode);
+
cur = inode_peek_iversion_raw(inode);
for (;;) {
/* If flag is already set, then no need to swap */
--
2.28.0
