Update the vnode's access time after an mmap operation on it.

Before this change a copy operation with cp(1) would not update the
file access times.

According to the POSIX mmap(2) documentation: the st_atime field
of the mapped file may be marked for update at any time between the
mmap() call and the corresponding munmap() call. The initial read
or write reference to a mapped region shall cause the file's st_atime
field to be marked for update if it has not already been marked for
update.

1 files changed, 12 insertions, 0 deletions

diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index 7c9e56d..ab3349e 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -1164,6 +1164,18 @@ vm_mmap_vnode(struct thread *td, vm_size_t objsize,
 	}
 	*objp = obj;
 	*flagsp = flags;
+
+	/* Update access time. */
+	if ((vp->v_mount->mnt_flag & MNT_NOATIME) == 0) {
+		struct vattr vattr;
+		struct timespec ts;
+
+		VATTR_NULL(&vattr);
+		vfs_timestamp(&ts);
+		vattr.va_atime = ts;
+		(void)VOP_SETATTR(vp, &vattr, td->td_ucred, td);
+
+	}
 done:
 	vput(vp);
 	VFS_UNLOCK_GIANT(vfslocked);