+int
+zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
+{
+ boolean_t owner = B_FALSE;
+ boolean_t groupmbr = B_FALSE;
+ boolean_t is_attr;
+ uid_t fowner;
+ uid_t gowner;
+ uid_t uid = crgetuid(cr);
+ int error;
+
+ if (zdp->z_phys->zp_flags & ZFS_AV_QUARANTINED)
+ return (EACCES);
+
+ is_attr = ((zdp->z_phys->zp_flags & ZFS_XATTR) &&
+ (ZTOV(zdp)->v_type == VDIR));
+ if (is_attr)
+ goto slow;
+
+ mutex_enter(&zdp->z_acl_lock);
+
+ if (zdp->z_phys->zp_flags & ZFS_NO_EXECS_DENIED) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ }
+
+ if (FUID_INDEX(zdp->z_phys->zp_uid) != 0 ||
+ FUID_INDEX(zdp->z_phys->zp_gid) != 0) {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+
+ fowner = (uid_t)zdp->z_phys->zp_uid;
+ gowner = (uid_t)zdp->z_phys->zp_gid;
+
+ if (uid == fowner) {
+ owner = B_TRUE;
+ if (zdp->z_phys->zp_mode & S_IXUSR) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ } else {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+ }
+ if (groupmember(gowner, cr)) {
+ groupmbr = B_TRUE;
+ if (zdp->z_phys->zp_mode & S_IXGRP) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ } else {
+ mutex_exit(&zdp->z_acl_lock);
+ goto slow;
+ }
+ }
+ if (!owner && !groupmbr) {
+ if (zdp->z_phys->zp_mode & S_IXOTH) {
+ mutex_exit(&zdp->z_acl_lock);
+ return (0);
+ }
+ }
+
+ mutex_exit(&zdp->z_acl_lock);
+
+slow:
+ DTRACE_PROBE(zfs__fastpath__execute__access__miss);
+ ZFS_ENTER(zdp->z_zfsvfs);
+ error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
+ ZFS_EXIT(zdp->z_zfsvfs);
+ return (error);
+}
+