RFC: ANDROID: fs: sdcardfs: Use inode iversion helpers

Upstream commit f02a9ad1f1 ("fs: handle inode->i_version more efficiently")
converted the inode -> i_version counter to an atomic64_t. So move to using
relevant iversion helper routines for basic operations instead.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

fs/sdcardfs/lookup.c

@@ -121,7 +121,7 @@ struct inode *sdcardfs_iget(struct super_block *sb, struct inode *lower_inode, u
 	inode->i_ino = lower_inode->i_ino;
 	sdcardfs_set_lower_inode(inode, lower_inode);
 
-	inode->i_version++;
+	inode_inc_iversion_raw(inode);
 
 	/* use different set of inode ops for symlinks & directories */
 	if (S_ISDIR(lower_inode->i_mode))

fs/sdcardfs/sdcardfs.h

@@ -45,6 +45,7 @@
 #include <linux/security.h>
 #include <linux/string.h>
 #include <linux/list.h>
+#include <linux/iversion.h>
 #include "multiuser.h"
 
 /* the file system name */

fs/sdcardfs/super.c

@@ -219,7 +219,7 @@ static struct inode *sdcardfs_alloc_inode(struct super_block *sb)
 	spin_lock_init(&i->top_lock);
 	kref_get(&d->refcount);
 
-	i->vfs_inode.i_version = 1;
+	inode_set_iversion(&i->vfs_inode, 1);
 	return &i->vfs_inode;
 }