diff --git a/sys/compat/freebsd32/freebsd32.h b/sys/compat/freebsd32/freebsd32.h
--- a/sys/compat/freebsd32/freebsd32.h
+++ b/sys/compat/freebsd32/freebsd32.h
@@ -240,7 +240,8 @@
 	uint32_t st_blksize;
 	uint32_t st_flags;
 	uint64_t st_gen;
-	uint64_t st_spare[10];
+	uint64_t st_filerev;
+	uint64_t st_spare[9];
 };
 struct freebsd11_stat32 {
 	uint32_t st_dev;
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -2251,6 +2251,7 @@
 	CP(*in, *out, st_blksize);
 	CP(*in, *out, st_flags);
 	CP(*in, *out, st_gen);
+	CP(*in, *out, st_filerev);
 	TS_CP(*in, *out, st_birthtim);
 	out->st_padding0 = 0;
 	out->st_padding1 = 0;
diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
--- a/sys/fs/tmpfs/tmpfs_vnops.c
+++ b/sys/fs/tmpfs/tmpfs_vnops.c
@@ -476,6 +476,7 @@
 	sb->st_blksize = PAGE_SIZE;
 	sb->st_flags = node->tn_flags;
 	sb->st_gen = node->tn_gen;
+	sb->st_filerev = 0;
 	if (vp->v_type == VREG) {
 #ifdef __ILP32__
 		vm_object_t obj = node->tn_reg.tn_aobj;
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -1620,6 +1620,7 @@
 
 	AUDIT_ARG_FILE(td->td_proc, fp);
 
+	sbp->st_filerev = 0;
 	error = fo_stat(fp, sbp, td->td_ucred);
 	fdrop(fp, td);
 #ifdef __STAT_TIME_T_EXT
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -1587,6 +1587,7 @@
 	sb->st_flags = vap->va_flags;
 	sb->st_blocks = vap->va_bytes / S_BLKSIZE;
 	sb->st_gen = vap->va_gen;
+	sb->st_filerev = vap->va_filerev;
 out:
 	return (vop_stat_helper_post(a, error));
 }
diff --git a/sys/sys/stat.h b/sys/sys/stat.h
--- a/sys/sys/stat.h
+++ b/sys/sys/stat.h
@@ -185,7 +185,8 @@
 	blksize_t st_blksize;		/* optimal blocksize for I/O */
 	fflags_t  st_flags;		/* user defined flags for file */
 	__uint64_t st_gen;		/* file generation number */
-	__uint64_t st_spare[10];
+	__uint64_t st_filerev;		/* file revision, incr on changes */
+	__uint64_t st_spare[9];
 };
 
 #ifdef _KERNEL
diff --git a/sys/ufs/ufs/ufs_vnops.c b/sys/ufs/ufs/ufs_vnops.c
--- a/sys/ufs/ufs/ufs_vnops.c
+++ b/sys/ufs/ufs/ufs_vnops.c
@@ -549,6 +549,7 @@
 		sb->st_birthtim.tv_sec = -1;
 		sb->st_birthtim.tv_nsec = 0;
 		sb->st_blocks = dbtob((uint64_t)ip->i_din1->di_blocks) / S_BLKSIZE;
+		sb->st_filerev = ip->i_din1->di_modrev;
 	} else {
 		sb->st_rdev = ip->i_din2->di_rdev;
 		sb->st_size = ip->i_din2->di_size;
@@ -559,6 +560,7 @@
 		sb->st_birthtim.tv_sec = ip->i_din2->di_birthtime;
 		sb->st_birthtim.tv_nsec = ip->i_din2->di_birthnsec;
 		sb->st_blocks = dbtob((uint64_t)ip->i_din2->di_blocks) / S_BLKSIZE;
+		sb->st_filerev = ip->i_din2->di_modrev;
 	}
 
 	sb->st_blksize = max(PAGE_SIZE, vp->v_mount->mnt_stat.f_iosize);