diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c index cf224981cbe..3518bbeaa27 100644 --- a/sys/kern/vfs_default.c +++ b/sys/kern/vfs_default.c @@ -1177,9 +1177,23 @@ vop_stdset_text(struct vop_set_text_args *ap) { struct vnode *vp; struct mount *mp; - int error; + int error, n; vp = ap->a_vp; + + /* + * Avoid the interlock if execs are already present. + */ + n = atomic_load_int(&vp->v_writecount); + for (;;) { + if (n > -1) { + break; + } + if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) { + return (0); + } + } + VI_LOCK(vp); if (vp->v_writecount > 0) { error = ETXTBSY; @@ -1207,10 +1221,24 @@ static int vop_stdunset_text(struct vop_unset_text_args *ap) { struct vnode *vp; - int error; + int error, n; bool last; vp = ap->a_vp; + + /* + * Avoid the interlock if this is not the last exec. + */ + n = atomic_load_int(&vp->v_writecount); + for (;;) { + if (n >= -1) { + break; + } + if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) { + return (0); + } + } + last = false; VI_LOCK(vp); if (vp->v_writecount < 0) {