[XFS] optimize timestamp updates, use new hires timestamps more directly,

also fix a bug where the mtime field was not correctly updated.

SGI Modid: 2.5.x-xfs:slinx:142296a

fs/xfs/linux/xfs_vnode.c

@@ -200,7 +200,7 @@ vn_revalidate(
 	vn_trace_entry(vp, "vn_revalidate", (inst_t *)__return_address);
 	ASSERT(vp->v_fbhv != NULL);
 
-	va.va_mask = XFS_AT_STAT|XFS_AT_GENCOUNT;
+	va.va_mask = XFS_AT_STAT;
 	VOP_GETATTR(vp, &va, 0, NULL, error);
 	if (!error) {
 		inode = LINVFS_GET_IP(vp);
@@ -210,12 +210,9 @@ vn_revalidate(
 		inode->i_gid	    = va.va_gid;
 		inode->i_size	    = va.va_size;
 		inode->i_blocks	    = va.va_nblocks;
-		inode->i_mtime.tv_sec	    = va.va_mtime.tv_sec;
-		inode->i_mtime.tv_nsec	    = va.va_mtime.tv_nsec;
-		inode->i_ctime.tv_sec	    = va.va_ctime.tv_sec;
-		inode->i_ctime.tv_nsec	    = va.va_ctime.tv_nsec;
-		inode->i_atime.tv_sec	    = va.va_atime.tv_sec;
-		inode->i_atime.tv_nsec	    = va.va_atime.tv_nsec;
+		inode->i_mtime	    = va.va_mtime;
+		inode->i_ctime	    = va.va_ctime;
+		inode->i_atime	    = va.va_atime;
 		VUNMODIFY(vp);
 	}
 	return -error;

fs/xfs/support/time.h

@@ -45,11 +45,7 @@ static inline void delay(long ticks)
 
 static inline void nanotime(struct timespec *tvp)
 {
-	struct timeval tv;
-
-	do_gettimeofday(&tv);
-	tvp->tv_sec = tv.tv_sec;
-	tvp->tv_nsec = tv.tv_usec * 1000;
+	*tvp = CURRENT_TIME;
 }
 
 #endif /* __XFS_SUPPORT_TIME_H__ */

fs/xfs/xfs_inode.c

@@ -3580,16 +3580,19 @@ xfs_ichgtime(xfs_inode_t *ip,
 
 	nanotime(&tv);
 	if (flags & XFS_ICHGTIME_MOD) {
-		inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
-		inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
+		inode->i_mtime = tv;
+		ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
+		ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
 	}
 	if (flags & XFS_ICHGTIME_ACC) {
-		inode->i_atime.tv_sec = ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
-		inode->i_atime.tv_nsec = ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
+		inode->i_atime  = tv;
+		ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
+		ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
 	}
 	if (flags & XFS_ICHGTIME_CHG) {
-		inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
-		inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
+		inode->i_ctime  = tv;
+		ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
+		ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
 	}
 
 	/*