Implemented kernel side of MNT_NOATIME mount option. This option disables

the file access time update on reads and can be useful in reducing
filesystem overhead in cases where the access time is not important (like
Usenet news spools).

4 files changed, 20 insertions, 13 deletions

diff --git a/sys/kern/vfs_extattr.c b/sys/kern/vfs_extattr.c
index 95e9de0..3870776 100644
--- a/sys/kern/vfs_extattr.c
+++ b/sys/kern/vfs_extattr.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vfs_syscalls.c	8.13 (Berkeley) 4/15/94
- * $Id: vfs_syscalls.c,v 1.47 1996/05/11 04:39:53 bde Exp $
+ * $Id: vfs_syscalls.c,v 1.48 1996/05/24 16:19:23 peter Exp $
  */
 
 /*
@@ -182,9 +182,9 @@ update:
 	else if (mp->mnt_flag & MNT_RDONLY)
 		mp->mnt_flag |= MNT_WANTRDWR;
 	mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
-	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC);
+	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME);
 	mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
-	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE);
+	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | MNT_NOATIME);
 	/*
 	 * Mount the filesystem.
 	 */
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 95e9de0..3870776 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vfs_syscalls.c	8.13 (Berkeley) 4/15/94
- * $Id: vfs_syscalls.c,v 1.47 1996/05/11 04:39:53 bde Exp $
+ * $Id: vfs_syscalls.c,v 1.48 1996/05/24 16:19:23 peter Exp $
  */
 
 /*
@@ -182,9 +182,9 @@ update:
 	else if (mp->mnt_flag & MNT_RDONLY)
 		mp->mnt_flag |= MNT_WANTRDWR;
 	mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
-	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC);
+	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME);
 	mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
-	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE);
+	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | MNT_NOATIME);
 	/*
 	 * Mount the filesystem.
 	 */
diff --git a/sys/sys/mount.h b/sys/sys/mount.h
index e6bad82..d044d29 100644
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)mount.h	8.13 (Berkeley) 3/27/94
- *	$Id: mount.h,v 1.30 1995/12/22 16:02:39 phk Exp $
+ *	$Id: mount.h,v 1.31 1996/01/30 23:00:54 mpp Exp $
  */
 
 #ifndef _SYS_MOUNT_H_
@@ -63,8 +63,7 @@ struct fid {
 #define MNAMELEN 90	/* length of buffer for returned name */
 
 struct statfs {
-	short	f_type;			/* type of filesystem (see below) */
-	short	f_flags;		/* copy of mount flags */
+	long	f_spare2;		/* placeholder */
 	long	f_bsize;		/* fundamental file system block size */
 	long	f_iosize;		/* optimal transfer block size */
 	long	f_blocks;		/* total data blocks in file system */
@@ -73,7 +72,10 @@ struct statfs {
 	long	f_files;		/* total file nodes in file system */
 	long	f_ffree;		/* free file nodes in fs */
 	fsid_t	f_fsid;			/* file system id */
-	long	f_spare[9];		/* spare for later */
+	uid_t	f_owner;		/* user that mounted the filesystem */
+	int	f_type;			/* type of filesystem (see below) */
+	int	f_flags;		/* copy of mount flags */
+	long	f_spare[6];		/* spare for later */
 	char	f_mntonname[MNAMELEN];	/* directory on which mounted */
 	char	f_mntfromname[MNAMELEN];/* mounted filesystem */
 };
@@ -156,6 +158,7 @@ struct mount {
 #define	MNT_NODEV	0x00000010	/* don't interpret special files */
 #define	MNT_UNION	0x00000020	/* union with underlying filesystem */
 #define	MNT_ASYNC	0x00000040	/* file system written asynchronously */
+#define	MNT_NOATIME	0x10000000	/* Disable update of file access times */
 
 /*
  * exported mount flags.
@@ -177,7 +180,10 @@ struct mount {
 /*
  * Mask of flags that are visible to statfs()
  */
-#define	MNT_VISFLAGMASK	0x0000ffff
+#define	MNT_VISFLAGMASK	(MNT_RDONLY|MNT_SYNCHRONOUS|MNT_NOEXEC|MNT_NOSUID| \
+			 MNT_NODEV|MNT_UNION|MNT_ASYNC|MNT_EXRDONLY|MNT_EXPORTED| \
+			 MNT_DEFEXPORTED|MNT_EXPORTANON|MNT_EXKERB|MNT_LOCAL| \
+			 MNT_QUOTA|MNT_ROOTFS|MNT_USER|MNT_NOATIME)
 
 /*
  * filesystem control flags.
diff --git a/sys/ufs/ufs/ufs_readwrite.c b/sys/ufs/ufs/ufs_readwrite.c
index ff2c540..415e7c6 100644
--- a/sys/ufs/ufs/ufs_readwrite.c
+++ b/sys/ufs/ufs/ufs_readwrite.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)ufs_readwrite.c	8.7 (Berkeley) 1/21/94
- * $Id: ufs_readwrite.c,v 1.20 1996/01/19 03:59:26 dyson Exp $
+ * $Id: ufs_readwrite.c,v 1.21 1996/06/25 03:00:44 davidg Exp $
  */
 
 #ifdef LFS_READWRITE
@@ -163,7 +163,8 @@ READ(ap)
 	}
 	if (bp != NULL)
 		bqrelse(bp);
-	ip->i_flag |= IN_ACCESS;
+	if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
+		ip->i_flag |= IN_ACCESS;
 	return (error);
 }