From 398755a75e9f4e95cc2a731317ab24f552653cd6 Mon Sep 17 00:00:00 2001
From: Yura Pakhuchiy <pakhuchiy@gmail.com>
Date: Thu, 13 Sep 2007 20:42:00 +0300
Subject: [PATCH] ntfsmount: Implement {no,}relatime (relative atime) options.

According to http://userweb.kernel.org/~akpm/mount-relative-atime.txt
Only several lines with new time handling ;-)
---
 ntfsprogs/ntfsmount.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ntfsprogs/ntfsmount.c b/ntfsprogs/ntfsmount.c
index c2eece1d..3d665095 100644
--- a/ntfsprogs/ntfsmount.c
+++ b/ntfsprogs/ntfsmount.c
@@ -115,6 +115,7 @@ typedef struct {
 	BOOL no_def_opts;
 	BOOL case_insensitive;
 	BOOL noatime;
+	BOOL relatime;
 	BOOL blkdev;
 } ntfs_fuse_context_t;
 
@@ -148,6 +149,7 @@ static const struct fuse_opt ntfs_fuse_opts[] = {
 	NTFS_FUSE_OPT("no_def_opts", no_def_opts),
 	NTFS_FUSE_OPT("case_insensitive", case_insensitive),
 	NTFS_FUSE_OPT("noatime", noatime),
+	NTFS_FUSE_OPT("relatime", relatime),
 	NTFS_FUSE_OPT("fmask=%o", fmask),
 	NTFS_FUSE_OPT("dmask=%o", dmask),
 	NTFS_FUSE_OPT("umask=%o", fmask),
@@ -158,6 +160,7 @@ static const struct fuse_opt ntfs_fuse_opts[] = {
 	NTFS_FUSE_OPT_NEG("rw", ro),
 	NTFS_FUSE_OPT_NEG("noblkdev", blkdev),
 	NTFS_FUSE_OPT_NEG("atime", noatime),
+	NTFS_FUSE_OPT_NEG("norelatime", relatime),
 	NTFS_FUSE_OPT_VAL("streams_interface=none", streams,
 			NF_STREAMS_INTERFACE_NONE),
 	NTFS_FUSE_OPT_VAL("streams_interface=windows", streams,
@@ -211,6 +214,10 @@ static __inline__ void ntfs_fuse_update_times(ntfs_inode *ni,
 {
 	if (ctx->noatime)
 		mask &= ~NTFS_UPDATE_ATIME;
+	if (ctx->relatime && mask == NTFS_UPDATE_ATIME &&
+			ni->last_access_time >= ni->last_data_change_time &&
+			ni->last_access_time >= ni->last_mft_change_time)
+		return;
 	ntfs_inode_update_times(ni, mask);
 }