2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1994 Jan-Simon Pendry
6 * The Regents of the University of California. All rights reserved.
7 * Copyright (c) 2005, 2006, 2012 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
8 * Copyright (c) 2006, 2012 Daichi Goto <daichi@freebsd.org>
10 * This code is derived from software contributed to Berkeley by
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)union_subr.c 8.20 (Berkeley) 5/20/95
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
46 #include <sys/mutex.h>
47 #include <sys/malloc.h>
48 #include <sys/mount.h>
49 #include <sys/namei.h>
51 #include <sys/vnode.h>
52 #include <sys/dirent.h>
53 #include <sys/fcntl.h>
54 #include <sys/filedesc.h>
56 #include <sys/resourcevar.h>
58 #include <security/mac/mac_framework.h>
62 #include <fs/unionfs/union.h>
64 #define NUNIONFSNODECACHE 16
66 static MALLOC_DEFINE(M_UNIONFSHASH, "UNIONFS hash", "UNIONFS hash table");
67 MALLOC_DEFINE(M_UNIONFSNODE, "UNIONFS node", "UNIONFS vnode private part");
68 MALLOC_DEFINE(M_UNIONFSPATH, "UNIONFS path", "UNIONFS path private part");
74 unionfs_init(struct vfsconf *vfsp)
76 UNIONFSDEBUG("unionfs_init\n"); /* printed during system boot */
84 unionfs_uninit(struct vfsconf *vfsp)
89 static struct unionfs_node_hashhead *
90 unionfs_get_hashhead(struct vnode *dvp, char *path)
94 struct unionfs_node *unp;
97 unp = VTOUNIONFS(dvp);
99 for (count = 0; path[count]; count++)
103 return (&(unp->un_hashtbl[hash & (unp->un_hashmask)]));
107 * Get the cached vnode.
109 static struct vnode *
110 unionfs_get_cached_vnode(struct vnode *uvp, struct vnode *lvp,
111 struct vnode *dvp, char *path)
113 struct unionfs_node_hashhead *hd;
114 struct unionfs_node *unp;
117 KASSERT((uvp == NULLVP || uvp->v_type == VDIR),
118 ("unionfs_get_cached_vnode: v_type != VDIR"));
119 KASSERT((lvp == NULLVP || lvp->v_type == VDIR),
120 ("unionfs_get_cached_vnode: v_type != VDIR"));
123 hd = unionfs_get_hashhead(dvp, path);
124 LIST_FOREACH(unp, hd, un_hash) {
125 if (!strcmp(unp->un_path, path)) {
126 vp = UNIONFSTOV(unp);
127 VI_LOCK_FLAGS(vp, MTX_DUPOK);
129 vp->v_iflag &= ~VI_OWEINACT;
130 if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
144 * Add the new vnode into cache.
146 static struct vnode *
147 unionfs_ins_cached_vnode(struct unionfs_node *uncp,
148 struct vnode *dvp, char *path)
150 struct unionfs_node_hashhead *hd;
151 struct unionfs_node *unp;
154 KASSERT((uncp->un_uppervp==NULLVP || uncp->un_uppervp->v_type==VDIR),
155 ("unionfs_ins_cached_vnode: v_type != VDIR"));
156 KASSERT((uncp->un_lowervp==NULLVP || uncp->un_lowervp->v_type==VDIR),
157 ("unionfs_ins_cached_vnode: v_type != VDIR"));
160 hd = unionfs_get_hashhead(dvp, path);
161 LIST_FOREACH(unp, hd, un_hash) {
162 if (!strcmp(unp->un_path, path)) {
163 vp = UNIONFSTOV(unp);
164 VI_LOCK_FLAGS(vp, MTX_DUPOK);
165 vp->v_iflag &= ~VI_OWEINACT;
166 if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
167 LIST_INSERT_HEAD(hd, uncp, un_hash);
177 LIST_INSERT_HEAD(hd, uncp, un_hash);
187 unionfs_rem_cached_vnode(struct unionfs_node *unp, struct vnode *dvp)
189 KASSERT((unp != NULL), ("unionfs_rem_cached_vnode: null node"));
190 KASSERT((dvp != NULLVP),
191 ("unionfs_rem_cached_vnode: null parent vnode"));
192 KASSERT((unp->un_hash.le_prev != NULL),
193 ("unionfs_rem_cached_vnode: null hash"));
196 LIST_REMOVE(unp, un_hash);
197 unp->un_hash.le_next = NULL;
198 unp->un_hash.le_prev = NULL;
203 * Make a new or get existing unionfs node.
205 * uppervp and lowervp should be unlocked. Because if new unionfs vnode is
206 * locked, uppervp or lowervp is locked too. In order to prevent dead lock,
207 * you should not lock plurality simultaneously.
210 unionfs_nodeget(struct mount *mp, struct vnode *uppervp,
211 struct vnode *lowervp, struct vnode *dvp,
212 struct vnode **vpp, struct componentname *cnp,
215 struct unionfs_mount *ump;
216 struct unionfs_node *unp;
223 ump = MOUNTTOUNIONFSMOUNT(mp);
224 lkflags = (cnp ? cnp->cn_lkflags : 0);
225 path = (cnp ? cnp->cn_nameptr : NULL);
228 if (uppervp == NULLVP && lowervp == NULLVP)
229 panic("unionfs_nodeget: upper and lower is null");
231 vt = (uppervp != NULLVP ? uppervp->v_type : lowervp->v_type);
233 /* If it has no ISLASTCN flag, path check is skipped. */
234 if (cnp && !(cnp->cn_flags & ISLASTCN))
237 /* check the cache */
238 if (path != NULL && dvp != NULLVP && vt == VDIR) {
239 vp = unionfs_get_cached_vnode(uppervp, lowervp, dvp, path);
243 goto unionfs_nodeget_out;
247 if ((uppervp == NULLVP || ump->um_uppervp != uppervp) ||
248 (lowervp == NULLVP || ump->um_lowervp != lowervp)) {
249 /* dvp will be NULLVP only in case of root vnode. */
253 unp = malloc(sizeof(struct unionfs_node),
254 M_UNIONFSNODE, M_WAITOK | M_ZERO);
256 error = getnewvnode("unionfs", mp, &unionfs_vnodeops, &vp);
258 free(unp, M_UNIONFSNODE);
261 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */
263 free(unp, M_UNIONFSNODE);
268 if (uppervp != NULLVP)
270 if (lowervp != NULLVP)
274 unp->un_hashtbl = hashinit(NUNIONFSNODECACHE, M_UNIONFSHASH,
275 &(unp->un_hashmask));
278 unp->un_uppervp = uppervp;
279 unp->un_lowervp = lowervp;
281 if (uppervp != NULLVP)
282 vp->v_vnlock = uppervp->v_vnlock;
284 vp->v_vnlock = lowervp->v_vnlock;
287 unp->un_path = (char *)
288 malloc(cnp->cn_namelen +1, M_UNIONFSPATH, M_WAITOK|M_ZERO);
289 bcopy(cnp->cn_nameptr, unp->un_path, cnp->cn_namelen);
290 unp->un_path[cnp->cn_namelen] = '\0';
295 if ((uppervp != NULLVP && ump->um_uppervp == uppervp) &&
296 (lowervp != NULLVP && ump->um_lowervp == lowervp))
297 vp->v_vflag |= VV_ROOT;
299 if (path != NULL && dvp != NULLVP && vt == VDIR)
300 *vpp = unionfs_ins_cached_vnode(unp, dvp, path);
301 if ((*vpp) != NULLVP) {
304 if (uppervp != NULLVP)
306 if (lowervp != NULLVP)
309 unp->un_uppervp = NULLVP;
310 unp->un_lowervp = NULLVP;
311 unp->un_dvp = NULLVP;
319 if (lkflags & LK_TYPE_MASK)
320 vn_lock(vp, lkflags | LK_RETRY);
326 * Clean up the unionfs node.
329 unionfs_noderem(struct vnode *vp, struct thread *td)
332 struct unionfs_node *unp, *unp_t1, *unp_t2;
333 struct unionfs_node_hashhead *hd;
334 struct unionfs_node_status *unsp, *unsp_tmp;
340 * Use the interlock to protect the clearing of v_data to
341 * prevent faults in unionfs_lock().
344 unp = VTOUNIONFS(vp);
345 lvp = unp->un_lowervp;
346 uvp = unp->un_uppervp;
348 unp->un_lowervp = unp->un_uppervp = NULLVP;
349 vp->v_vnlock = &(vp->v_lock);
355 VOP_UNLOCK(lvp, LK_RELEASE);
357 VOP_UNLOCK(uvp, LK_RELEASE);
359 if (dvp != NULLVP && unp->un_hash.le_prev != NULL)
360 unionfs_rem_cached_vnode(unp, dvp);
362 if (lockmgr(vp->v_vnlock, LK_EXCLUSIVE, VI_MTX(vp)) != 0)
363 panic("the lock for deletion is unacquirable.");
371 unp->un_dvp = NULLVP;
373 if (unp->un_path != NULL) {
374 free(unp->un_path, M_UNIONFSPATH);
378 if (unp->un_hashtbl != NULL) {
379 for (count = 0; count <= unp->un_hashmask; count++) {
380 hd = unp->un_hashtbl + count;
381 LIST_FOREACH_SAFE(unp_t1, hd, un_hash, unp_t2) {
382 LIST_REMOVE(unp_t1, un_hash);
383 unp_t1->un_hash.le_next = NULL;
384 unp_t1->un_hash.le_prev = NULL;
387 hashdestroy(unp->un_hashtbl, M_UNIONFSHASH, unp->un_hashmask);
390 LIST_FOREACH_SAFE(unsp, &(unp->un_unshead), uns_list, unsp_tmp) {
391 LIST_REMOVE(unsp, uns_list);
394 free(unp, M_UNIONFSNODE);
398 * Get the unionfs node status.
399 * You need exclusive lock this vnode.
402 unionfs_get_node_status(struct unionfs_node *unp, struct thread *td,
403 struct unionfs_node_status **unspp)
405 struct unionfs_node_status *unsp;
406 pid_t pid = td->td_proc->p_pid;
408 KASSERT(NULL != unspp, ("null pointer"));
409 ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
411 LIST_FOREACH(unsp, &(unp->un_unshead), uns_list) {
412 if (unsp->uns_pid == pid) {
418 /* create a new unionfs node status */
419 unsp = malloc(sizeof(struct unionfs_node_status),
420 M_TEMP, M_WAITOK | M_ZERO);
423 LIST_INSERT_HEAD(&(unp->un_unshead), unsp, uns_list);
429 * Remove the unionfs node status, if you can.
430 * You need exclusive lock this vnode.
433 unionfs_tryrem_node_status(struct unionfs_node *unp,
434 struct unionfs_node_status *unsp)
436 KASSERT(NULL != unsp, ("null pointer"));
437 ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
439 if (0 < unsp->uns_lower_opencnt || 0 < unsp->uns_upper_opencnt)
442 LIST_REMOVE(unsp, uns_list);
447 * Create upper node attr.
450 unionfs_create_uppervattr_core(struct unionfs_mount *ump,
456 uva->va_type = lva->va_type;
457 uva->va_atime = lva->va_atime;
458 uva->va_mtime = lva->va_mtime;
459 uva->va_ctime = lva->va_ctime;
461 switch (ump->um_copymode) {
462 case UNIONFS_TRANSPARENT:
463 uva->va_mode = lva->va_mode;
464 uva->va_uid = lva->va_uid;
465 uva->va_gid = lva->va_gid;
467 case UNIONFS_MASQUERADE:
468 if (ump->um_uid == lva->va_uid) {
469 uva->va_mode = lva->va_mode & 077077;
470 uva->va_mode |= (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile) & 0700;
471 uva->va_uid = lva->va_uid;
472 uva->va_gid = lva->va_gid;
474 uva->va_mode = (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile);
475 uva->va_uid = ump->um_uid;
476 uva->va_gid = ump->um_gid;
479 default: /* UNIONFS_TRADITIONAL */
480 uva->va_mode = 0777 & ~td->td_proc->p_fd->fd_cmask;
481 uva->va_uid = ump->um_uid;
482 uva->va_gid = ump->um_gid;
488 * Create upper node attr.
491 unionfs_create_uppervattr(struct unionfs_mount *ump,
500 if ((error = VOP_GETATTR(lvp, &lva, cred)))
503 unionfs_create_uppervattr_core(ump, &lva, uva, td);
511 * dvp should be locked on entry and will be locked on return.
513 * If an error is returned, *vpp will be invalid, otherwise it will hold a
514 * locked, referenced vnode. If *vpp == dvp then remember that only one
515 * LK_EXCLUSIVE lock is held.
518 unionfs_relookup(struct vnode *dvp, struct vnode **vpp,
519 struct componentname *cnp, struct componentname *cn,
520 struct thread *td, char *path, int pathlen, u_long nameiop)
524 cn->cn_namelen = pathlen;
525 cn->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
526 bcopy(path, cn->cn_pnbuf, pathlen);
527 cn->cn_pnbuf[pathlen] = '\0';
529 cn->cn_nameiop = nameiop;
530 cn->cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
531 cn->cn_lkflags = LK_EXCLUSIVE;
533 cn->cn_cred = cnp->cn_cred;
535 cn->cn_nameptr = cn->cn_pnbuf;
537 if (nameiop == DELETE)
538 cn->cn_flags |= (cnp->cn_flags & (DOWHITEOUT | SAVESTART));
539 else if (RENAME == nameiop)
540 cn->cn_flags |= (cnp->cn_flags & SAVESTART);
541 else if (nameiop == CREATE)
542 cn->cn_flags |= NOCACHE;
545 VOP_UNLOCK(dvp, LK_RELEASE);
547 if ((error = relookup(dvp, vpp, cn))) {
548 uma_zfree(namei_zone, cn->cn_pnbuf);
549 cn->cn_flags &= ~HASBUF;
550 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
558 * relookup for CREATE namei operation.
560 * dvp is unionfs vnode. dvp should be locked.
562 * If it called 'unionfs_copyfile' function by unionfs_link etc,
563 * VOP_LOOKUP information is broken.
564 * So it need relookup in order to create link etc.
567 unionfs_relookup_for_create(struct vnode *dvp, struct componentname *cnp,
573 struct componentname cn;
575 udvp = UNIONFSVPTOUPPERVP(dvp);
578 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
579 strlen(cnp->cn_nameptr), CREATE);
592 if (cn.cn_flags & HASBUF) {
593 uma_zfree(namei_zone, cn.cn_pnbuf);
594 cn.cn_flags &= ~HASBUF;
598 cn.cn_flags |= (cnp->cn_flags & HASBUF);
599 cnp->cn_flags = cn.cn_flags;
606 * relookup for DELETE namei operation.
608 * dvp is unionfs vnode. dvp should be locked.
611 unionfs_relookup_for_delete(struct vnode *dvp, struct componentname *cnp,
617 struct componentname cn;
619 udvp = UNIONFSVPTOUPPERVP(dvp);
622 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
623 strlen(cnp->cn_nameptr), DELETE);
636 if (cn.cn_flags & HASBUF) {
637 uma_zfree(namei_zone, cn.cn_pnbuf);
638 cn.cn_flags &= ~HASBUF;
642 cn.cn_flags |= (cnp->cn_flags & HASBUF);
643 cnp->cn_flags = cn.cn_flags;
650 * relookup for RENAME namei operation.
652 * dvp is unionfs vnode. dvp should be locked.
655 unionfs_relookup_for_rename(struct vnode *dvp, struct componentname *cnp,
661 struct componentname cn;
663 udvp = UNIONFSVPTOUPPERVP(dvp);
666 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
667 strlen(cnp->cn_nameptr), RENAME);
678 if (cn.cn_flags & HASBUF) {
679 uma_zfree(namei_zone, cn.cn_pnbuf);
680 cn.cn_flags &= ~HASBUF;
684 cn.cn_flags |= (cnp->cn_flags & HASBUF);
685 cnp->cn_flags = cn.cn_flags;
693 * Update the unionfs_node.
695 * uvp is new locked upper vnode. unionfs vnode's lock will be exchanged to the
696 * uvp's lock and lower's lock will be unlocked.
699 unionfs_node_update(struct unionfs_node *unp, struct vnode *uvp,
702 unsigned count, lockrec;
707 vp = UNIONFSTOV(unp);
708 lvp = unp->un_lowervp;
709 ASSERT_VOP_ELOCKED(lvp, "unionfs_node_update");
716 unp->un_uppervp = uvp;
717 vp->v_vnlock = uvp->v_vnlock;
719 lockrec = lvp->v_vnlock->lk_recurse;
720 for (count = 0; count < lockrec; count++)
721 vn_lock(uvp, LK_EXCLUSIVE | LK_CANRECURSE | LK_RETRY);
726 if (unp->un_path != NULL && dvp != NULLVP && vp->v_type == VDIR) {
727 static struct unionfs_node_hashhead *hd;
730 hd = unionfs_get_hashhead(dvp, unp->un_path);
731 LIST_REMOVE(unp, un_hash);
732 LIST_INSERT_HEAD(hd, unp, un_hash);
738 * Create a new shadow dir.
740 * udvp should be locked on entry and will be locked on return.
742 * If no error returned, unp will be updated.
745 unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *udvp,
746 struct unionfs_node *unp, struct componentname *cnp,
754 struct componentname cn;
757 struct ucred *credbk;
758 struct uidinfo *rootinfo;
760 if (unp->un_uppervp != NULLVP)
763 lvp = unp->un_lowervp;
765 credbk = cnp->cn_cred;
767 /* Authority change to root */
768 rootinfo = uifind((uid_t)0);
769 cred = crdup(cnp->cn_cred);
771 * The calls to chgproccnt() are needed to compensate for change_ruid()
772 * calling chgproccnt().
774 chgproccnt(cred->cr_ruidinfo, 1, 0);
775 change_euid(cred, rootinfo);
776 change_ruid(cred, rootinfo);
777 change_svuid(cred, (uid_t)0);
781 memset(&cn, 0, sizeof(cn));
783 if ((error = VOP_GETATTR(lvp, &lva, cnp->cn_cred)))
784 goto unionfs_mkshadowdir_abort;
786 if ((error = unionfs_relookup(udvp, &uvp, cnp, &cn, td, cnp->cn_nameptr, cnp->cn_namelen, CREATE)))
787 goto unionfs_mkshadowdir_abort;
795 goto unionfs_mkshadowdir_free_out;
798 if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)))
799 goto unionfs_mkshadowdir_free_out;
800 unionfs_create_uppervattr_core(ump, &lva, &va, td);
802 error = VOP_MKDIR(udvp, &uvp, &cn, &va);
805 unionfs_node_update(unp, uvp, td);
808 * XXX The bug which cannot set uid/gid was corrected.
812 VOP_SETATTR(uvp, &va, cn.cn_cred);
814 vn_finished_write(mp);
816 unionfs_mkshadowdir_free_out:
817 if (cn.cn_flags & HASBUF) {
818 uma_zfree(namei_zone, cn.cn_pnbuf);
819 cn.cn_flags &= ~HASBUF;
822 unionfs_mkshadowdir_abort:
823 cnp->cn_cred = credbk;
824 chgproccnt(cred->cr_ruidinfo, -1, 0);
831 * Create a new whiteout.
833 * dvp should be locked on entry and will be locked on return.
836 unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp,
837 struct thread *td, char *path)
841 struct componentname cn;
845 path = cnp->cn_nameptr;
848 if ((error = unionfs_relookup(dvp, &wvp, cnp, &cn, td, path, strlen(path), CREATE)))
851 if (cn.cn_flags & HASBUF) {
852 uma_zfree(namei_zone, cn.cn_pnbuf);
853 cn.cn_flags &= ~HASBUF;
863 if ((error = vn_start_write(dvp, &mp, V_WAIT | PCATCH)))
864 goto unionfs_mkwhiteout_free_out;
865 error = VOP_WHITEOUT(dvp, &cn, CREATE);
867 vn_finished_write(mp);
869 unionfs_mkwhiteout_free_out:
870 if (cn.cn_flags & HASBUF) {
871 uma_zfree(namei_zone, cn.cn_pnbuf);
872 cn.cn_flags &= ~HASBUF;
879 * Create a new vnode for create a new shadow file.
881 * If an error is returned, *vpp will be invalid, otherwise it will hold a
882 * locked, referenced and opened vnode.
884 * unp is never updated.
887 unionfs_vn_create_on_upper(struct vnode **vpp, struct vnode *udvp,
888 struct unionfs_node *unp, struct vattr *uvap,
891 struct unionfs_mount *ump;
898 struct componentname cn;
900 ump = MOUNTTOUNIONFSMOUNT(UNIONFSTOV(unp)->v_mount);
902 lvp = unp->un_lowervp;
904 fmode = FFLAGS(O_WRONLY | O_CREAT | O_TRUNC | O_EXCL);
907 if ((error = VOP_GETATTR(lvp, &lva, cred)) != 0)
909 unionfs_create_uppervattr_core(ump, &lva, uvap, td);
911 if (unp->un_path == NULL)
912 panic("unionfs: un_path is null");
914 cn.cn_namelen = strlen(unp->un_path);
915 cn.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
916 bcopy(unp->un_path, cn.cn_pnbuf, cn.cn_namelen + 1);
917 cn.cn_nameiop = CREATE;
918 cn.cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
919 cn.cn_lkflags = LK_EXCLUSIVE;
922 cn.cn_nameptr = cn.cn_pnbuf;
925 if ((error = relookup(udvp, &vp, &cn)) != 0)
926 goto unionfs_vn_create_on_upper_free_out2;
935 goto unionfs_vn_create_on_upper_free_out1;
938 if ((error = VOP_CREATE(udvp, &vp, &cn, uvap)) != 0)
939 goto unionfs_vn_create_on_upper_free_out1;
941 if ((error = VOP_OPEN(vp, fmode, cred, td, NULL)) != 0) {
943 goto unionfs_vn_create_on_upper_free_out1;
945 error = VOP_ADD_WRITECOUNT(vp, 1);
946 CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
951 VOP_CLOSE(vp, fmode, cred, td);
954 unionfs_vn_create_on_upper_free_out1:
955 VOP_UNLOCK(udvp, LK_RELEASE);
957 unionfs_vn_create_on_upper_free_out2:
958 if (cn.cn_flags & HASBUF) {
959 uma_zfree(namei_zone, cn.cn_pnbuf);
960 cn.cn_flags &= ~HASBUF;
967 * Copy from lvp to uvp.
969 * lvp and uvp should be locked and opened on entry and will be locked and
973 unionfs_copyfile_core(struct vnode *lvp, struct vnode *uvp,
974 struct ucred *cred, struct thread *td)
985 memset(&uio, 0, sizeof(uio));
988 uio.uio_segflg = UIO_SYSSPACE;
991 buf = malloc(MAXBSIZE, M_TEMP, M_WAITOK);
994 offset = uio.uio_offset;
999 iov.iov_len = MAXBSIZE;
1000 uio.uio_resid = iov.iov_len;
1001 uio.uio_rw = UIO_READ;
1003 if ((error = VOP_READ(lvp, &uio, 0, cred)) != 0)
1005 if ((count = MAXBSIZE - uio.uio_resid) == 0)
1009 while (bufoffset < count) {
1012 iov.iov_base = buf + bufoffset;
1013 iov.iov_len = count - bufoffset;
1014 uio.uio_offset = offset + bufoffset;
1015 uio.uio_resid = iov.iov_len;
1016 uio.uio_rw = UIO_WRITE;
1018 if ((error = VOP_WRITE(uvp, &uio, 0, cred)) != 0)
1021 bufoffset += (count - bufoffset) - uio.uio_resid;
1024 uio.uio_offset = offset + bufoffset;
1033 * Copy file from lower to upper.
1035 * If you need copy of the contents, set 1 to docopy. Otherwise, set 0 to
1038 * If no error returned, unp will be updated.
1041 unionfs_copyfile(struct unionfs_node *unp, int docopy, struct ucred *cred,
1051 lvp = unp->un_lowervp;
1054 if ((UNIONFSTOV(unp)->v_mount->mnt_flag & MNT_RDONLY))
1056 if (unp->un_dvp == NULLVP)
1058 if (unp->un_uppervp != NULLVP)
1060 udvp = VTOUNIONFS(unp->un_dvp)->un_uppervp;
1063 if ((udvp->v_mount->mnt_flag & MNT_RDONLY))
1066 error = VOP_ACCESS(lvp, VREAD, cred, td);
1070 if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)) != 0)
1072 error = unionfs_vn_create_on_upper(&uvp, udvp, unp, &uva, td);
1074 vn_finished_write(mp);
1079 error = VOP_OPEN(lvp, FREAD, cred, td, NULL);
1081 error = unionfs_copyfile_core(lvp, uvp, cred, td);
1082 VOP_CLOSE(lvp, FREAD, cred, td);
1085 VOP_CLOSE(uvp, FWRITE, cred, td);
1086 VOP_ADD_WRITECOUNT_CHECKED(uvp, -1);
1087 CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d", __func__, uvp,
1090 vn_finished_write(mp);
1093 /* Reset the attributes. Ignore errors. */
1095 VOP_SETATTR(uvp, &uva, cred);
1098 unionfs_node_update(unp, uvp, td);
1104 * It checks whether vp can rmdir. (check empty)
1106 * vp is unionfs vnode.
1107 * vp should be locked.
1110 unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td)
1119 struct componentname cn;
1121 * The size of buf needs to be larger than DIRBLKSIZ.
1129 ASSERT_VOP_ELOCKED(vp, "unionfs_check_rmdir");
1132 uvp = UNIONFSVPTOUPPERVP(vp);
1133 lvp = UNIONFSVPTOLOWERVP(vp);
1136 if ((error = VOP_GETATTR(uvp, &va, cred)) != 0)
1138 if (va.va_flags & OPAQUE)
1143 if ((error = mac_vnode_check_open(cred, vp, VEXEC|VREAD)) != 0)
1146 if ((error = VOP_ACCESS(vp, VEXEC|VREAD, cred, td)) != 0)
1148 if ((error = VOP_OPEN(vp, FREAD, cred, td, NULL)) != 0)
1151 uio.uio_rw = UIO_READ;
1152 uio.uio_segflg = UIO_SYSSPACE;
1157 error = mac_vnode_check_readdir(td->td_ucred, lvp);
1159 while (!error && !eofflag) {
1161 iov.iov_len = sizeof(buf);
1164 uio.uio_resid = iov.iov_len;
1166 error = VOP_READDIR(lvp, &uio, cred, &eofflag, NULL, NULL);
1169 if (eofflag == 0 && uio.uio_resid == sizeof(buf)) {
1171 panic("bad readdir response from lower FS.");
1176 edp = (struct dirent*)&buf[sizeof(buf) - uio.uio_resid];
1177 for (dp = (struct dirent*)buf; !error && dp < edp;
1178 dp = (struct dirent*)((caddr_t)dp + dp->d_reclen)) {
1179 if (dp->d_type == DT_WHT || dp->d_fileno == 0 ||
1180 (dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1181 (dp->d_namlen == 2 && !bcmp(dp->d_name, "..", 2)))
1184 cn.cn_namelen = dp->d_namlen;
1186 cn.cn_nameptr = dp->d_name;
1187 cn.cn_nameiop = LOOKUP;
1188 cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
1189 cn.cn_lkflags = LK_EXCLUSIVE;
1194 * check entry in lower.
1195 * Sometimes, readdir function returns
1198 lookuperr = VOP_LOOKUP(lvp, &tvp, &cn);
1203 continue; /* skip entry */
1207 * If it has no exist/whiteout entry in upper,
1208 * directory is not empty.
1210 cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
1211 lookuperr = VOP_LOOKUP(uvp, &tvp, &cn);
1216 /* ignore exist or whiteout entry */
1218 (lookuperr == ENOENT && (cn.cn_flags & ISWHITEOUT)))
1226 VOP_CLOSE(vp, FREAD, cred, td);
1234 unionfs_checkuppervp(struct vnode *vp, char *fil, int lno)
1236 struct unionfs_node *unp;
1238 unp = VTOUNIONFS(vp);
1241 if (vp->v_op != unionfs_vnodeop_p) {
1242 printf("unionfs_checkuppervp: on non-unionfs-node.\n");
1244 kdb_enter(KDB_WHY_UNIONFS,
1245 "unionfs_checkuppervp: on non-unionfs-node.\n");
1247 panic("unionfs_checkuppervp");
1250 return (unp->un_uppervp);
1254 unionfs_checklowervp(struct vnode *vp, char *fil, int lno)
1256 struct unionfs_node *unp;
1258 unp = VTOUNIONFS(vp);
1261 if (vp->v_op != unionfs_vnodeop_p) {
1262 printf("unionfs_checklowervp: on non-unionfs-node.\n");
1264 kdb_enter(KDB_WHY_UNIONFS,
1265 "unionfs_checklowervp: on non-unionfs-node.\n");
1267 panic("unionfs_checklowervp");
1270 return (unp->un_lowervp);