bsd/vfs/vfs_lookup.c

108 static	void kdebug_lookup(struct vnode *dp, struct componentname *cnp);
115 int		lookup_traverse_mountpoints(struct nameidata *ndp, struct componentname *cnp, vnode_t dp, int vbusyflags, vfs_context_t ctx);
117 int		lookup_authorize_search(vnode_t dp, struct componentname *cnp, int dp_authorized_in_cache, vfs_context_t ctx);
119 int		lookup_handle_rsrc_fork(vnode_t dp, struct nameidata *ndp, struct componentname *cnp, int wantparent, vfs_context_t ctx);
164 	struct vnode *dp;	/* the directory we are searching */
335 		dp = ndp->ni_rootdir;
337 	        dp = ndp->ni_dvp;
338 		ndp->ni_usedvp = dp;
340 	        dp = vfs_context_cwd(ctx);
342 	if (dp == NULLVP || (dp->v_lflag & VL_DEAD)) {
350 		ndp->ni_startdir = dp;
364 		error = lookup_handle_symlink(ndp, &dp, ctx);
401 namei_compound_available(vnode_t dp, struct nameidata *ndp)
404 		return vnode_compound_open_available(dp);
410 lookup_authorize_search(vnode_t dp, struct componentname *cnp, int dp_authorized_in_cache, vfs_context_t ctx)
415 		error = vnode_authorize(dp, NULL, KAUTH_VNODE_SEARCH, ctx);
420 	error = mac_vnode_check_lookup(ctx, dp, cnp);
474 lookup_handle_rsrc_fork(vnode_t dp, struct nameidata *ndp, struct componentname *cnp, int wantparent, vfs_context_t ctx)
480 	if (dp->v_type != VREG) {
515 	error = vnode_getnamedstream(dp, &svp, XATTR_RESOURCEFORK_NAME, nsop, 0, ctx);
535 		ndp->ni_dvp = dp;
537 		vnode_put(dp);
572 	vnode_t dp;
576 	dp = ndp->ni_vp;
588 	if (dp->v_resolve) {
589 		error = vnode_trigger_resolve(dp, ndp, ctx);
606 		lookup_consider_update_cache(ndp->ni_dvp, dp, cnp, nc_generation);
614 	error = lookup_traverse_mountpoints(ndp, cnp, dp, vbusyflags, ctx);
615 	dp = ndp->ni_vp;
621 	if (vfs_flags(vnode_mount(dp)) & MNT_MULTILABEL) {
622 		error = vnode_label(vnode_mount(dp), NULL, dp, NULL, 0, ctx);
631 	if ((dp->v_type == VLNK) &&
642 		if (dp->v_type != VDIR) {
655 	if (vnode_isshadow (dp)) {
701 		 * on both dp and ni_dvp, but for some reason
703 		 * need to do vnode_put on dp in 'bad2'
717 		AUDIT_ARG(vnpath, dp, ARG_VNODE1);
719 		AUDIT_ARG(vnpath, dp, ARG_VNODE2);
725 	if ((cnp->cn_flags & CN_WANTSRSRCFORK) && (dp != NULLVP)) {
726 		error = lookup_handle_rsrc_fork(dp, ndp, cnp, wantparent, ctx);
730 		dp = ndp->ni_vp;
734 	        kdebug_lookup(dp, cnp);
755 	vnode_t dp;
758 	dp = ndp->ni_vp;
764 	if (dp->v_type != VDIR) {
775 		 * on dp, but for some reason can't
777 		 * need to do vnode_put on dp in 'bad'
779 	        if ( (vnode_get(dp)) ) {
783 		ndp->ni_dvp = dp;
788 	ndp->ni_vp = dp;
791 		AUDIT_ARG(vnpath, dp, ARG_VNODE1);
793 		AUDIT_ARG(vnpath, dp, ARG_VNODE2);
861 	vnode_t		tdp;		/* saved dp */
862 	vnode_t		dp;		/* the directory we are searching */
888 	dp = ndp->ni_startdir;
896 	        if ( (vnode_getwithref(dp)) ) {
897 			dp = NULLVP;
901 		ndp->ni_vp = dp;
913 	if ( (error = cache_lookup_path(ndp, cnp, dp, ctx, &dp_authorized, last_dp)) ) {
914 		dp = NULLVP;
923 	dp = ndp->ni_dvp;
928 		 * we're guaranteed that the dp is a VDIR, it's
936 	        if (dp != NULLVP)
937 		        nc_generation = dp->v_nc_generation - 1;
954 		        if (dp == ndp->ni_rootdir || dp == rootvnode) {
955 			        ndp->ni_dvp = dp;
956 				ndp->ni_vp = dp;
959 				 * we've already got one reference on 'dp'
965 				if ( (vnode_get(dp)) ) {
972 			if ((dp->v_flag & VROOT) == 0 ||
975 			if (dp->v_mount == NULL) {	/* forced umount */
979 			tdp = dp;
980 			dp = tdp->v_mount->mnt_vnodecovered;
984 			if ( (vnode_getwithref(dp)) ) {
985 			        dp = NULLVP;
989 			ndp->ni_dvp = dp;
1000 	if (dp->v_type != VDIR) {
1005 		error = lookup_authorize_search(dp, cnp, dp_authorized, ctx);
1016 	if ((cnp->cn_flags & ISLASTCN) && namei_compound_available(dp, ndp) && !(cnp->cn_flags & CN_WANTSRSRCFORK)) {
1018 	if ((cnp->cn_flags & ISLASTCN) && namei_compound_available(dp, ndp)) {
1021 		ndp->ni_ncgeneration = dp->v_nc_generation;
1025         nc_generation = dp->v_nc_generation;
1027 	error = VNOP_LOOKUP(dp, &ndp->ni_vp, cnp, ctx);
1033 		    (dp->v_flag & VROOT) && (dp->v_mount != NULL) &&
1034 		    (dp->v_mount->mnt_flag & MNT_UNION)) {
1038 				unlock_fsnode(dp, NULL);
1041 			tdp = dp;
1042 			dp = tdp->v_mount->mnt_vnodecovered;
1046 			if ( (vnode_getwithref(dp)) ) {
1047 			        dp = NULLVP;
1051 			ndp->ni_dvp = dp;
1092 		dp = ndp->ni_vp;
1095 		if ((dp->v_type == VLNK) &&
1102 		 * cache_lookup_path is now responsible for dropping io ref on dp
1104 		 * a ref on dp until we complete the next round of lookup.
1106 		last_dp = dp;
1126 	        kdebug_lookup(dp, cnp);
1136 	if (dp)
1137 	        vnode_put(dp);
1141 	        kdebug_lookup(dp, cnp);
1168 lookup_traverse_mountpoints(struct nameidata *ndp, struct componentname *cnp, vnode_t dp,
1180 	mounted_on_dp = dp;
1183 	while ((dp->v_type == VDIR) && dp->v_mountedhere &&
1189 		if (dp->v_resolve) {
1190 			(void) vnode_trigger_resolve(dp, ndp, ctx);
1193 		vnode_lock(dp);
1195 		if ((dp->v_type == VDIR) && (mp = dp->v_mountedhere)) {
1198 			vnode_unlock(dp);
1202 				mount_dropcrossref(mp, dp, 0);
1231 			mount_dropcrossref(mp, dp, 0);
1238 			vnode_put(dp);
1239 			ndp->ni_vp = dp = tdp;
1246 			if (dp->v_resolve) {
1247 				error = vnode_trigger_resolve(dp, ndp, ctx);
1255 			vnode_unlock(dp);
1265 			mp->mnt_realrootvp_vid = dp->v_id;
1266 			mp->mnt_realrootvp = dp;
1292 	vnode_t dp;
1367 	dp = ndp->ni_dvp;
1386 		if ((dp = ndp->ni_rootdir) == NULLVP) {
1391 	*new_dp = dp;
1403 	struct vnode *dp = NULL;		/* the directory we are searching */
1425 	dp = dvp;
1437 		if (dp->v_type != VDIR) {
1441 		if ( (vnode_get(dp)) ) {
1445 		*vpp = dp;
1454 	if ( (error = VNOP_LOOKUP(dp, vpp, cnp, ctx)) ) {
1476 	dp = *vpp;
1482 	if (dp->v_type == VLNK && (cnp->cn_flags & FOLLOW))
1499 	vnode_put(dp);
1570 kdebug_lookup(struct vnode *dp, struct componentname *cnp)
1605 	KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, code, dp, dbg_parms[0], dbg_parms[1], dbg_parms[2], 0);
1618 kdebug_lookup(struct vnode *dp __unused, struct componentname *cnp __unused)