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);
118 void		lookup_consider_update_cache(vnode_t dvp, vnode_t vp, struct componentname *cnp, int nc_generation);
119 int		lookup_handle_rsrc_fork(vnode_t dp, struct nameidata *ndp, struct componentname *cnp, int wantparent, vfs_context_t ctx);
120 int		lookup_handle_found_vnode(struct nameidata *ndp, struct componentname *cnp, int rdonly,
123 int 		lookup_handle_emptyname(struct nameidata *ndp, struct componentname *cnp, int wantparent);
169 	struct componentname *cnp = &ndp->ni_cnd;
170 	vfs_context_t ctx = cnp->cn_context;
182 	if (cnp->cn_nameiop & (~OPMASK))
184 	if (cnp->cn_flags & OPMASK)
195 		rdonly = cnp->cn_flags & RDONLY;
196 		vbusyflags = ((cnp->cn_flags & CN_NBMOUNTLOOK) != 0) ? LK_NOWAIT : 0;
198 		wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT);
207 			if ((cnp->cn_flags & ISSYMLINK) == 0) {
223 	if ((cnp->cn_flags & HASBUF) == 0) {
224 		cnp->cn_pnbuf = ndp->ni_pathbuf;
225 		cnp->cn_pnlen = PATHBUFLEN;
237 		error = copyinstr(ndp->ni_dirp, cnp->cn_pnbuf,
238 			    cnp->cn_pnlen, (size_t *)&ndp->ni_pathlen);
240 		error = copystr(CAST_DOWN(void *, ndp->ni_dirp), cnp->cn_pnbuf,
241 			    cnp->cn_pnlen, (size_t *)&ndp->ni_pathlen);
243 	if (error == ENAMETOOLONG && !(cnp->cn_flags & HASBUF)) {
244 		MALLOC_ZONE(cnp->cn_pnbuf, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
245 		if (cnp->cn_pnbuf == NULL) {
250 		cnp->cn_flags |= HASBUF;
251 		cnp->cn_pnlen = MAXPATHLEN;
266 	    cnp->cn_pnbuf[0] == '/' &&
267 	    cnp->cn_pnbuf[1] == '.' &&
268 	    cnp->cn_pnbuf[2] == 'v' &&
269 	    cnp->cn_pnbuf[3] == 'o' &&
270 	    cnp->cn_pnbuf[4] == 'l' &&
271 	    cnp->cn_pnbuf[5] == '/' ) {
283 			if ((realpath_err= vfs_getrealpath(&cnp->cn_pnbuf[6], realpath, MAXPATHLEN, ctx))) {
290 				if (cnp->cn_flags & HASBUF) {
291 					FREE_ZONE(cnp->cn_pnbuf, cnp->cn_pnlen, M_NAMEI);
293 				cnp->cn_pnbuf = realpath;
294 				cnp->cn_pnlen = MAXPATHLEN;
296 				cnp->cn_flags |= HASBUF | CN_VOLFSPATH;
304 	if (cnp->cn_flags & AUDITVNPATH1)
305 		AUDIT_ARG(upath, ut->uu_cdir, cnp->cn_pnbuf, ARG_UPATH1);
306 	if (cnp->cn_flags & AUDITVNPATH2)
307 		AUDIT_ARG(upath, ut->uu_cdir, cnp->cn_pnbuf, ARG_UPATH2);
313 	if (*cnp->cn_pnbuf == '\0') {
326 	cnp->cn_nameptr = cnp->cn_pnbuf;
330 	if (*(cnp->cn_nameptr) == '/') {
331 	        while (*(cnp->cn_nameptr) == '/') {
332 		        cnp->cn_nameptr++;
336 	} else if (cnp->cn_flags & USEDVP) {
358 		if ((cnp->cn_flags & ISSYMLINK) == 0) {
381 	if ( (cnp->cn_flags & HASBUF) ) {
382 		cnp->cn_flags &= ~HASBUF;
383 		FREE_ZONE(cnp->cn_pnbuf, cnp->cn_pnlen, M_NAMEI);
385 	cnp->cn_pnbuf = NULL;
410 lookup_authorize_search(vnode_t dp, struct componentname *cnp, int dp_authorized_in_cache, vfs_context_t ctx)
420 	error = mac_vnode_check_lookup(ctx, dp, cnp);
429 lookup_consider_update_cache(vnode_t dvp, vnode_t vp, struct componentname *cnp, int nc_generation)
432 	isdot_or_dotdot = (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') || (cnp->cn_flags & ISDOTDOT);
444 				vnode_update_identity(vp, dvp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_hash, update_flags);
447 	if ( (cnp->cn_flags & MAKEENTRY) && (vp->v_flag & VNCACHEABLE) && LIST_FIRST(&vp->v_nclinks) == NULL) {
462 			cache_enter_with_gen(dvp, vp, cnp, nc_generation);
474 lookup_handle_rsrc_fork(vnode_t dp, struct nameidata *ndp, struct componentname *cnp, int wantparent, vfs_context_t ctx)
484 	switch (cnp->cn_nameiop) {
486 			if (cnp->cn_flags & CN_ALLOWRSRCFORK) {
494 			if (cnp->cn_flags & CN_ALLOWRSRCFORK) {
503 			if (cnp->cn_flags & CN_ALLOWRSRCFORK) {
545 	cnp->cn_flags  &= ~MAKEENTRY;
568 lookup_handle_found_vnode(struct nameidata *ndp, struct componentname *cnp, int rdonly,
600 	if (cnp->cn_consume > 0) {
601 		cnp->cn_nameptr += cnp->cn_consume;
602 		ndp->ni_next += cnp->cn_consume;
603 		ndp->ni_pathlen -= cnp->cn_consume;
604 		cnp->cn_consume = 0;
606 		lookup_consider_update_cache(ndp->ni_dvp, dp, cnp, nc_generation);
614 	error = lookup_traverse_mountpoints(ndp, cnp, dp, vbusyflags, ctx);
632 	    ((cnp->cn_flags & FOLLOW) || (ndp->ni_flag & NAMEI_TRAILINGSLASH) || *ndp->ni_next == '/')) {
633 		cnp->cn_flags |= ISSYMLINK;
669 		cnp->cn_nameptr = ndp->ni_next + 1;
671 		while (*cnp->cn_nameptr == '/') {
672 			cnp->cn_nameptr++;
676 		cp = cnp->cn_nameptr;
692 	    (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) {
698 	if (cnp->cn_flags & SAVESTART) {
716 	if (cnp->cn_flags & AUDITVNPATH1)
718 	else if (cnp->cn_flags & AUDITVNPATH2)
725 	if ((cnp->cn_flags & CN_WANTSRSRCFORK) && (dp != NULLVP)) {
726 		error = lookup_handle_rsrc_fork(dp, ndp, cnp, wantparent, ctx);
734 	        kdebug_lookup(dp, cnp);
739 	error = lookup_handle_emptyname(ndp, cnp, wantparent);
753 lookup_handle_emptyname(struct nameidata *ndp, struct componentname *cnp, int wantparent)
759 	cnp->cn_namelen = 0;
768 	if (cnp->cn_nameiop != LOOKUP) {
785 	cnp->cn_flags &= ~ISDOTDOT;
786 	cnp->cn_flags |= ISLASTCN;
787 	ndp->ni_next = cnp->cn_nameptr;
790 	if (cnp->cn_flags & AUDITVNPATH1)
792 	else if (cnp->cn_flags & AUDITVNPATH2)
794 	if (cnp->cn_flags & SAVESTART)
868 	struct componentname *cnp = &ndp->ni_cnd;
869 	vfs_context_t ctx = cnp->cn_context;
879 	if (cnp->cn_flags & (NOCACHE | DOWHITEOUT)) {
880 	        if ((cnp->cn_flags & NOCACHE) || (cnp->cn_nameiop == DELETE))
883 	wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT);
884 	rdonly = cnp->cn_flags & RDONLY;
885 	cnp->cn_flags &= ~ISSYMLINK;
886 	cnp->cn_consume = 0;
891 	if ((cnp->cn_flags & CN_NBMOUNTLOOK) != 0)
893 	cp = cnp->cn_nameptr;
902 		error = lookup_handle_emptyname(ndp, cnp, wantparent);
913 	if ( (error = cache_lookup_path(ndp, cnp, dp, ctx, &dp_authorized, last_dp)) ) {
917 	if ((cnp->cn_flags & ISLASTCN)) {
919 		        cnp->cn_flags |= MAKEENTRY;
921 	        cnp->cn_flags |= MAKEENTRY;
952 	if ( (cnp->cn_flags & ISDOTDOT) ) {
973 			    (cnp->cn_flags & NOCROSSMOUNT))
1004 	if ( (cnp->cn_flags & DONOTAUTH) != DONOTAUTH ) {
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)) {
1027 	error = VNOP_LOOKUP(dp, &ndp->ni_vp, cnp, ctx);
1036 		        if ((cnp->cn_flags & FSNODELOCKHELD)) {
1037 			        cnp->cn_flags &= ~FSNODELOCKHELD;
1070 		if (cnp->cn_flags & SAVESTART) {
1081 		        kdebug_lookup(ndp->ni_dvp, cnp);
1086 	error = lookup_handle_found_vnode(ndp, cnp, rdonly, vbusyflags, &keep_going, nc_generation, wantparent, atroot, ctx);
1096 				((cnp->cn_flags & FOLLOW) || (ndp->ni_flag & NAMEI_TRAILINGSLASH) || *ndp->ni_next == '/')) {
1114 	if ((cnp->cn_flags & FSNODELOCKHELD)) {
1115 	        cnp->cn_flags &= ~FSNODELOCKHELD;
1126 	        kdebug_lookup(dp, cnp);
1131 	if ((cnp->cn_flags & FSNODELOCKHELD)) {
1132 	        cnp->cn_flags &= ~FSNODELOCKHELD;
1141 	        kdebug_lookup(dp, cnp);
1148 	struct componentname *cnp = &ndp->ni_cnd;
1154 	if (cnp->cn_flags & RDONLY) {
1157 	if ((cnp->cn_flags & ISLASTCN) && (ndp->ni_flag & NAMEI_TRAILINGSLASH) && !(cnp->cn_flags & WILLBEDIR)) {
1168 lookup_traverse_mountpoints(struct nameidata *ndp, struct componentname *cnp, vnode_t dp,
1184 			((cnp->cn_flags & NOCROSSMOUNT) == 0)) {
1220 			if ((cnp->cn_flags & ISLASTCN) &&
1221 					(cnp->cn_nameiop != LOOKUP ||
1222 					 (cnp->cn_flags & NOTRIGGER))) {
1291 	struct componentname *cnp = &ndp->ni_cnd;
1296 	if ((cnp->cn_flags & FSNODELOCKHELD)) {
1297 		cnp->cn_flags &= ~FSNODELOCKHELD;
1309 	if (ndp->ni_pathlen > 1 || !(cnp->cn_flags & HASBUF))
1320 		cp = cnp->cn_pnbuf;
1346 		long len = cnp->cn_pnlen;
1348 		tmppn = cnp->cn_pnbuf;
1350 		cnp->cn_pnbuf = cp;
1351 		cnp->cn_pnlen = MAXPATHLEN;
1353 		if ( (cnp->cn_flags & HASBUF) )
1356 			cnp->cn_flags |= HASBUF;
1358 		cnp->cn_pnbuf[linklen] = '\0';
1361 	cnp->cn_nameptr = cnp->cn_pnbuf;
1381 	if (*(cnp->cn_nameptr) == '/') {
1382 		while (*(cnp->cn_nameptr) == '/') {
1383 			cnp->cn_nameptr++;
1401 relookup(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp)
1411 	vfs_context_t ctx = cnp->cn_context;;
1416 	wantparent = cnp->cn_flags & (LOCKPARENT|WANTPARENT);
1417 	rdonly = cnp->cn_flags & RDONLY;
1418 	cnp->cn_flags &= ~ISSYMLINK;
1420 	if (cnp->cn_flags & NOCACHE)
1421 	        cnp->cn_flags &= ~MAKEENTRY;
1423 	        cnp->cn_flags |= MAKEENTRY;
1432 	if (cnp->cn_nameptr[0] == '\0') {
1433 		if (cnp->cn_nameiop != LOOKUP || wantparent) {
1447 		if (cnp->cn_flags & SAVESTART)
1454 	if ( (error = VNOP_LOOKUP(dp, vpp, cnp, ctx)) ) {
1482 	if (dp->v_type == VLNK && (cnp->cn_flags & FOLLOW))
1490 	    (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) {
1570 kdebug_lookup(struct vnode *dp, struct componentname *cnp)
1579 	dbg_namelen = (cnp->cn_nameptr - cnp->cn_pnbuf) + cnp->cn_namelen;
1580 	dbg_nameptr = cnp->cn_nameptr + cnp->cn_namelen;
1592 		       *(cnp->cn_nameptr + cnp->cn_namelen) ? '>' : 0,
1618 kdebug_lookup(struct vnode *dp __unused, struct componentname *cnp __unused)