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authorJeff Layton <jlayton@redhat.com>2018-01-29 06:41:30 -0500
committerJeff Layton <jlayton@redhat.com>2018-01-29 06:41:30 -0500
commitae5e165d855dd978a461b22175531b07f54fb61f (patch)
tree8b603c15aff71082d3d9e67b7eab089396349ce0 /fs/btrfs
parent7a11ac289c437cb06633620940b191a63dec1f4a (diff)
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/file.c1
-rw-r--r--fs/btrfs/inode.c1
-rw-r--r--fs/btrfs/ioctl.c1
-rw-r--r--fs/btrfs/xattr.c1
4 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index eb1bac7c8553..c95d7b2efefb 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -31,6 +31,7 @@
#include <linux/slab.h>
#include <linux/btrfs.h>
#include <linux/uio.h>
+#include <linux/iversion.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index e1a7f3cb5be9..27f008b33fc1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -43,6 +43,7 @@
#include <linux/posix_acl_xattr.h>
#include <linux/uio.h>
#include <linux/magic.h>
+#include <linux/iversion.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2ef8acaac688..aa452c9e2eff 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -43,6 +43,7 @@
#include <linux/uuid.h>
#include <linux/btrfs.h>
#include <linux/uaccess.h>
+#include <linux/iversion.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 2c7e53f9ff1b..5258c1714830 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -23,6 +23,7 @@
#include <linux/xattr.h>
#include <linux/security.h>
#include <linux/posix_acl_xattr.h>
+#include <linux/iversion.h>
#include "ctree.h"
#include "btrfs_inode.h"
#include "transaction.h"