2 * Copyright (c) 1994 Jan-Simon Pendry
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 2005, 2006 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
6 * Copyright (c) 2006 Daichi Goto <daichi@freebsd.org>
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#)union_subr.c 8.20 (Berkeley) 5/20/95
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
43 #include <sys/mutex.h>
44 #include <sys/malloc.h>
45 #include <sys/mount.h>
46 #include <sys/namei.h>
48 #include <sys/vnode.h>
49 #include <sys/dirent.h>
50 #include <sys/fcntl.h>
51 #include <sys/filedesc.h>
53 #include <sys/resourcevar.h>
61 #include <fs/unionfs/union.h>
63 #define NUNIONFSNODECACHE 16
65 static MALLOC_DEFINE(M_UNIONFSHASH, "UNIONFS hash", "UNIONFS hash table");
66 MALLOC_DEFINE(M_UNIONFSNODE, "UNIONFS node", "UNIONFS vnode private part");
67 MALLOC_DEFINE(M_UNIONFSPATH, "UNIONFS path", "UNIONFS path private part");
73 unionfs_init(struct vfsconf *vfsp)
75 UNIONFSDEBUG("unionfs_init\n"); /* printed during system boot */
83 unionfs_uninit(struct vfsconf *vfsp)
88 static struct unionfs_node_hashhead *
89 unionfs_get_hashhead(struct vnode *dvp, char *path)
93 struct unionfs_node *unp;
96 unp = VTOUNIONFS(dvp);
98 for (count = 0; path[count]; count++)
102 return (&(unp->un_hashtbl[hash & (unp->un_hashmask)]));
106 * Get the cached vnode.
108 static struct vnode *
109 unionfs_get_cached_vnode(struct vnode *uvp, struct vnode *lvp,
110 struct vnode *dvp, char *path)
112 struct unionfs_node_hashhead *hd;
113 struct unionfs_node *unp;
116 KASSERT((uvp == NULLVP || uvp->v_type == VDIR || uvp->v_type == VSOCK),
117 ("unionfs_get_cached_vnode: v_type != VDIR/VSOCK"));
118 KASSERT((lvp == NULLVP || lvp->v_type == VDIR || lvp->v_type == VSOCK),
119 ("unionfs_get_cached_vnode: v_type != VDIR/VSOCK"));
122 hd = unionfs_get_hashhead(dvp, path);
123 LIST_FOREACH(unp, hd, un_hash) {
124 if (!strcmp(unp->un_path, path)) {
125 vp = UNIONFSTOV(unp);
126 VI_LOCK_FLAGS(vp, MTX_DUPOK);
128 vp->v_iflag &= ~VI_OWEINACT;
129 if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
143 * Add the new vnode into cache.
145 static struct vnode *
146 unionfs_ins_cached_vnode(struct unionfs_node *uncp,
147 struct vnode *dvp, char *path)
149 struct unionfs_node_hashhead *hd;
150 struct unionfs_node *unp;
153 KASSERT((uncp->un_uppervp==NULLVP || uncp->un_uppervp->v_type==VDIR ||
154 uncp->un_uppervp->v_type==VSOCK),
155 ("unionfs_ins_cached_vnode: v_type != VDIR/VSOCK"));
156 KASSERT((uncp->un_lowervp==NULLVP || uncp->un_lowervp->v_type==VDIR ||
157 uncp->un_lowervp->v_type==VSOCK),
158 ("unionfs_ins_cached_vnode: v_type != VDIR/VSOCK"));
161 hd = unionfs_get_hashhead(dvp, path);
162 LIST_FOREACH(unp, hd, un_hash) {
163 if (!strcmp(unp->un_path, path)) {
164 vp = UNIONFSTOV(unp);
165 VI_LOCK_FLAGS(vp, MTX_DUPOK);
166 vp->v_iflag &= ~VI_OWEINACT;
167 if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
168 LIST_INSERT_HEAD(hd, uncp, un_hash);
178 LIST_INSERT_HEAD(hd, uncp, un_hash);
188 unionfs_rem_cached_vnode(struct unionfs_node *unp, struct vnode *dvp)
190 KASSERT((unp != NULL), ("unionfs_rem_cached_vnode: null node"));
191 KASSERT((dvp != NULLVP),
192 ("unionfs_rem_cached_vnode: null parent vnode"));
193 KASSERT((unp->un_hash.le_prev != NULL),
194 ("unionfs_rem_cached_vnode: null hash"));
197 LIST_REMOVE(unp, un_hash);
198 unp->un_hash.le_next = NULL;
199 unp->un_hash.le_prev = NULL;
204 * Make a new or get existing unionfs node.
206 * uppervp and lowervp should be unlocked. Because if new unionfs vnode is
207 * locked, uppervp or lowervp is locked too. In order to prevent dead lock,
208 * you should not lock plurality simultaneously.
211 unionfs_nodeget(struct mount *mp, struct vnode *uppervp,
212 struct vnode *lowervp, struct vnode *dvp,
213 struct vnode **vpp, struct componentname *cnp,
216 struct unionfs_mount *ump;
217 struct unionfs_node *unp;
224 ump = MOUNTTOUNIONFSMOUNT(mp);
225 lkflags = (cnp ? cnp->cn_lkflags : 0);
226 path = (cnp ? cnp->cn_nameptr : NULL);
229 if (uppervp == NULLVP && lowervp == NULLVP)
230 panic("unionfs_nodeget: upper and lower is null");
232 vt = (uppervp != NULLVP ? uppervp->v_type : lowervp->v_type);
234 /* If it has no ISLASTCN flag, path check is skipped. */
235 if (cnp && !(cnp->cn_flags & ISLASTCN))
238 /* check the cache */
239 if (path != NULL && dvp != NULLVP && (vt == VDIR || vt == VSOCK)) {
240 vp = unionfs_get_cached_vnode(uppervp, lowervp, dvp, path);
244 goto unionfs_nodeget_out;
248 if ((uppervp == NULLVP || ump->um_uppervp != uppervp) ||
249 (lowervp == NULLVP || ump->um_lowervp != lowervp)) {
250 /* dvp will be NULLVP only in case of root vnode. */
256 * Do the MALLOC before the getnewvnode since doing so afterward
257 * might cause a bogus v_data pointer to get dereferenced elsewhere
258 * if MALLOC should block.
260 MALLOC(unp, struct unionfs_node *, sizeof(struct unionfs_node),
261 M_UNIONFSNODE, M_WAITOK | M_ZERO);
263 error = getnewvnode("unionfs", mp, &unionfs_vnodeops, &vp);
265 FREE(unp, M_UNIONFSNODE);
268 error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */
270 FREE(unp, M_UNIONFSNODE);
275 if (uppervp != NULLVP)
277 if (lowervp != NULLVP)
282 unp->un_hashtbl = hashinit(NUNIONFSNODECACHE, M_UNIONFSHASH,
283 &(unp->un_hashmask));
286 if (uppervp != NULLVP)
287 vp->v_socket = uppervp->v_socket;
289 vp->v_socket = lowervp->v_socket;
296 unp->un_uppervp = uppervp;
297 unp->un_lowervp = lowervp;
299 if (uppervp != NULLVP)
300 vp->v_vnlock = uppervp->v_vnlock;
302 vp->v_vnlock = lowervp->v_vnlock;
305 unp->un_path = (char *)
306 malloc(cnp->cn_namelen +1, M_UNIONFSPATH, M_WAITOK|M_ZERO);
307 bcopy(cnp->cn_nameptr, unp->un_path, cnp->cn_namelen);
308 unp->un_path[cnp->cn_namelen] = '\0';
313 if ((uppervp != NULLVP && ump->um_uppervp == uppervp) &&
314 (lowervp != NULLVP && ump->um_lowervp == lowervp))
315 vp->v_vflag |= VV_ROOT;
317 if (path != NULL && dvp != NULLVP && (vt == VDIR || vt == VSOCK))
318 *vpp = unionfs_ins_cached_vnode(unp, dvp, path);
319 if ((*vpp) != NULLVP) {
322 if (uppervp != NULLVP)
324 if (lowervp != NULLVP)
327 unp->un_uppervp = NULLVP;
328 unp->un_lowervp = NULLVP;
329 unp->un_dvp = NULLVP;
337 if (lkflags & LK_TYPE_MASK)
338 vn_lock(vp, lkflags | LK_RETRY);
344 * Clean up the unionfs node.
347 unionfs_noderem(struct vnode *vp, struct thread *td)
351 struct unionfs_node *unp, *unp_t1, *unp_t2;
352 struct unionfs_node_hashhead *hd;
353 struct unionfs_node_status *unsp, *unsp_tmp;
359 * Use the interlock to protect the clearing of v_data to
360 * prevent faults in unionfs_lock().
363 unp = VTOUNIONFS(vp);
364 lvp = unp->un_lowervp;
365 uvp = unp->un_uppervp;
367 unp->un_lowervp = unp->un_uppervp = NULLVP;
369 vp->v_vnlock = &(vp->v_lock);
371 lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_INTERLOCK, VI_MTX(vp));
378 if (dvp != NULLVP && unp->un_hash.le_prev != NULL)
379 unionfs_rem_cached_vnode(unp, dvp);
382 vfslocked = VFS_LOCK_GIANT(lvp->v_mount);
384 VFS_UNLOCK_GIANT(vfslocked);
387 vfslocked = VFS_LOCK_GIANT(uvp->v_mount);
389 VFS_UNLOCK_GIANT(vfslocked);
392 vfslocked = VFS_LOCK_GIANT(dvp->v_mount);
394 VFS_UNLOCK_GIANT(vfslocked);
395 unp->un_dvp = NULLVP;
397 if (unp->un_path != NULL) {
398 free(unp->un_path, M_UNIONFSPATH);
402 if (unp->un_hashtbl != NULL) {
403 for (count = 0; count <= unp->un_hashmask; count++) {
404 hd = unp->un_hashtbl + count;
405 LIST_FOREACH_SAFE(unp_t1, hd, un_hash, unp_t2) {
406 LIST_REMOVE(unp_t1, un_hash);
407 unp_t1->un_hash.le_next = NULL;
408 unp_t1->un_hash.le_prev = NULL;
411 hashdestroy(unp->un_hashtbl, M_UNIONFSHASH, unp->un_hashmask);
414 LIST_FOREACH_SAFE(unsp, &(unp->un_unshead), uns_list, unsp_tmp) {
415 LIST_REMOVE(unsp, uns_list);
418 FREE(unp, M_UNIONFSNODE);
422 * Get the unionfs node status.
423 * You need exclusive lock this vnode.
426 unionfs_get_node_status(struct unionfs_node *unp, struct thread *td,
427 struct unionfs_node_status **unspp)
429 struct unionfs_node_status *unsp;
430 pid_t pid = td->td_proc->p_pid;
432 KASSERT(NULL != unspp, ("null pointer"));
433 ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
435 LIST_FOREACH(unsp, &(unp->un_unshead), uns_list) {
436 if (unsp->uns_pid == pid) {
442 /* create a new unionfs node status */
443 MALLOC(unsp, struct unionfs_node_status *,
444 sizeof(struct unionfs_node_status), M_TEMP, M_WAITOK | M_ZERO);
447 LIST_INSERT_HEAD(&(unp->un_unshead), unsp, uns_list);
453 * Remove the unionfs node status, if you can.
454 * You need exclusive lock this vnode.
457 unionfs_tryrem_node_status(struct unionfs_node *unp,
458 struct unionfs_node_status *unsp)
460 KASSERT(NULL != unsp, ("null pointer"));
461 ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
463 if (0 < unsp->uns_lower_opencnt || 0 < unsp->uns_upper_opencnt)
466 LIST_REMOVE(unsp, uns_list);
471 * Create upper node attr.
474 unionfs_create_uppervattr_core(struct unionfs_mount *ump,
480 uva->va_type = lva->va_type;
481 uva->va_atime = lva->va_atime;
482 uva->va_mtime = lva->va_mtime;
483 uva->va_ctime = lva->va_ctime;
485 switch (ump->um_copymode) {
486 case UNIONFS_TRANSPARENT:
487 uva->va_mode = lva->va_mode;
488 uva->va_uid = lva->va_uid;
489 uva->va_gid = lva->va_gid;
491 case UNIONFS_MASQUERADE:
492 if (ump->um_uid == lva->va_uid) {
493 uva->va_mode = lva->va_mode & 077077;
494 uva->va_mode |= (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile) & 0700;
495 uva->va_uid = lva->va_uid;
496 uva->va_gid = lva->va_gid;
498 uva->va_mode = (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile);
499 uva->va_uid = ump->um_uid;
500 uva->va_gid = ump->um_gid;
503 default: /* UNIONFS_TRADITIONAL */
504 FILEDESC_SLOCK(td->td_proc->p_fd);
505 uva->va_mode = 0777 & ~td->td_proc->p_fd->fd_cmask;
506 FILEDESC_SUNLOCK(td->td_proc->p_fd);
507 uva->va_uid = ump->um_uid;
508 uva->va_gid = ump->um_gid;
514 * Create upper node attr.
517 unionfs_create_uppervattr(struct unionfs_mount *ump,
526 if ((error = VOP_GETATTR(lvp, &lva, cred)))
529 unionfs_create_uppervattr_core(ump, &lva, uva, td);
537 * dvp should be locked on entry and will be locked on return.
539 * If an error is returned, *vpp will be invalid, otherwise it will hold a
540 * locked, referenced vnode. If *vpp == dvp then remember that only one
541 * LK_EXCLUSIVE lock is held.
544 unionfs_relookup(struct vnode *dvp, struct vnode **vpp,
545 struct componentname *cnp, struct componentname *cn,
546 struct thread *td, char *path, int pathlen, u_long nameiop)
550 cn->cn_namelen = pathlen;
551 cn->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
552 bcopy(path, cn->cn_pnbuf, pathlen);
553 cn->cn_pnbuf[pathlen] = '\0';
555 cn->cn_nameiop = nameiop;
556 cn->cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
557 cn->cn_lkflags = LK_EXCLUSIVE;
559 cn->cn_cred = cnp->cn_cred;
561 cn->cn_nameptr = cn->cn_pnbuf;
562 cn->cn_consume = cnp->cn_consume;
564 if (nameiop == DELETE)
565 cn->cn_flags |= (cnp->cn_flags & (DOWHITEOUT | SAVESTART));
566 else if (RENAME == nameiop)
567 cn->cn_flags |= (cnp->cn_flags & SAVESTART);
572 if ((error = relookup(dvp, vpp, cn))) {
573 uma_zfree(namei_zone, cn->cn_pnbuf);
574 cn->cn_flags &= ~HASBUF;
575 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
583 * relookup for CREATE namei operation.
585 * dvp is unionfs vnode. dvp should be locked.
587 * If it called 'unionfs_copyfile' function by unionfs_link etc,
588 * VOP_LOOKUP information is broken.
589 * So it need relookup in order to create link etc.
592 unionfs_relookup_for_create(struct vnode *dvp, struct componentname *cnp,
598 struct componentname cn;
600 udvp = UNIONFSVPTOUPPERVP(dvp);
603 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
604 strlen(cnp->cn_nameptr), CREATE);
617 if (cn.cn_flags & HASBUF) {
618 uma_zfree(namei_zone, cn.cn_pnbuf);
619 cn.cn_flags &= ~HASBUF;
623 cn.cn_flags |= (cnp->cn_flags & HASBUF);
624 cnp->cn_flags = cn.cn_flags;
631 * relookup for DELETE namei operation.
633 * dvp is unionfs vnode. dvp should be locked.
636 unionfs_relookup_for_delete(struct vnode *dvp, struct componentname *cnp,
642 struct componentname cn;
644 udvp = UNIONFSVPTOUPPERVP(dvp);
647 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
648 strlen(cnp->cn_nameptr), DELETE);
661 if (cn.cn_flags & HASBUF) {
662 uma_zfree(namei_zone, cn.cn_pnbuf);
663 cn.cn_flags &= ~HASBUF;
667 cn.cn_flags |= (cnp->cn_flags & HASBUF);
668 cnp->cn_flags = cn.cn_flags;
675 * relookup for RENAME namei operation.
677 * dvp is unionfs vnode. dvp should be locked.
680 unionfs_relookup_for_rename(struct vnode *dvp, struct componentname *cnp,
686 struct componentname cn;
688 udvp = UNIONFSVPTOUPPERVP(dvp);
691 error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
692 strlen(cnp->cn_nameptr), RENAME);
703 if (cn.cn_flags & HASBUF) {
704 uma_zfree(namei_zone, cn.cn_pnbuf);
705 cn.cn_flags &= ~HASBUF;
709 cn.cn_flags |= (cnp->cn_flags & HASBUF);
710 cnp->cn_flags = cn.cn_flags;
718 * Update the unionfs_node.
720 * uvp is new locked upper vnode. unionfs vnode's lock will be exchanged to the
721 * uvp's lock and lower's lock will be unlocked.
724 unionfs_node_update(struct unionfs_node *unp, struct vnode *uvp,
727 unsigned count, lockrec;
732 vp = UNIONFSTOV(unp);
733 lvp = unp->un_lowervp;
734 ASSERT_VOP_ELOCKED(lvp, "unionfs_node_update");
741 unp->un_uppervp = uvp;
742 vp->v_vnlock = uvp->v_vnlock;
744 lockrec = lvp->v_vnlock->lk_recurse;
745 for (count = 0; count < lockrec; count++)
746 vn_lock(uvp, LK_EXCLUSIVE | LK_CANRECURSE | LK_RETRY);
751 if (unp->un_path != NULL && dvp != NULLVP &&
752 (vp->v_type == VDIR || vp->v_type == VSOCK)) {
753 static struct unionfs_node_hashhead *hd;
756 hd = unionfs_get_hashhead(dvp, unp->un_path);
757 LIST_REMOVE(unp, un_hash);
758 LIST_INSERT_HEAD(hd, unp, un_hash);
764 * Create a new shadow dir.
766 * udvp should be locked on entry and will be locked on return.
768 * If no error returned, unp will be updated.
771 unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *udvp,
772 struct unionfs_node *unp, struct componentname *cnp,
780 struct componentname cn;
783 struct ucred *credbk;
784 struct uidinfo *rootinfo;
786 if (unp->un_uppervp != NULLVP)
789 lvp = unp->un_lowervp;
791 credbk = cnp->cn_cred;
793 /* Authority change to root */
794 rootinfo = uifind((uid_t)0);
795 cred = crdup(cnp->cn_cred);
796 chgproccnt(cred->cr_ruidinfo, 1, 0);
797 change_euid(cred, rootinfo);
798 change_ruid(cred, rootinfo);
799 change_svuid(cred, (uid_t)0);
803 memset(&cn, 0, sizeof(cn));
805 if ((error = VOP_GETATTR(lvp, &lva, cnp->cn_cred)))
806 goto unionfs_mkshadowdir_abort;
808 if ((error = unionfs_relookup(udvp, &uvp, cnp, &cn, td, cnp->cn_nameptr, cnp->cn_namelen, CREATE)))
809 goto unionfs_mkshadowdir_abort;
817 goto unionfs_mkshadowdir_free_out;
820 if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)))
821 goto unionfs_mkshadowdir_free_out;
822 if ((error = VOP_LEASE(udvp, td, cn.cn_cred, LEASE_WRITE))) {
823 vn_finished_write(mp);
824 goto unionfs_mkshadowdir_free_out;
826 unionfs_create_uppervattr_core(ump, &lva, &va, td);
828 error = VOP_MKDIR(udvp, &uvp, &cn, &va);
831 unionfs_node_update(unp, uvp, td);
834 * XXX The bug which cannot set uid/gid was corrected.
838 VOP_SETATTR(uvp, &va, cn.cn_cred);
840 vn_finished_write(mp);
842 unionfs_mkshadowdir_free_out:
843 if (cn.cn_flags & HASBUF) {
844 uma_zfree(namei_zone, cn.cn_pnbuf);
845 cn.cn_flags &= ~HASBUF;
848 unionfs_mkshadowdir_abort:
849 cnp->cn_cred = credbk;
850 chgproccnt(cred->cr_ruidinfo, -1, 0);
857 * Create a new whiteout.
859 * dvp should be locked on entry and will be locked on return.
862 unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp,
863 struct thread *td, char *path)
867 struct componentname cn;
871 path = cnp->cn_nameptr;
874 if ((error = unionfs_relookup(dvp, &wvp, cnp, &cn, td, path, strlen(path), CREATE)))
877 if (cn.cn_flags & HASBUF) {
878 uma_zfree(namei_zone, cn.cn_pnbuf);
879 cn.cn_flags &= ~HASBUF;
889 if ((error = vn_start_write(dvp, &mp, V_WAIT | PCATCH)))
890 goto unionfs_mkwhiteout_free_out;
891 if (!(error = VOP_LEASE(dvp, td, td->td_ucred, LEASE_WRITE)))
892 error = VOP_WHITEOUT(dvp, &cn, CREATE);
894 vn_finished_write(mp);
896 unionfs_mkwhiteout_free_out:
897 if (cn.cn_flags & HASBUF) {
898 uma_zfree(namei_zone, cn.cn_pnbuf);
899 cn.cn_flags &= ~HASBUF;
906 * Create a new vnode for create a new shadow file.
908 * If an error is returned, *vpp will be invalid, otherwise it will hold a
909 * locked, referenced and opened vnode.
911 * unp is never updated.
914 unionfs_vn_create_on_upper(struct vnode **vpp, struct vnode *udvp,
915 struct unionfs_node *unp, struct vattr *uvap,
918 struct unionfs_mount *ump;
925 struct componentname cn;
927 ump = MOUNTTOUNIONFSMOUNT(UNIONFSTOV(unp)->v_mount);
929 lvp = unp->un_lowervp;
931 fmode = FFLAGS(O_WRONLY | O_CREAT | O_TRUNC | O_EXCL);
934 if ((error = VOP_GETATTR(lvp, &lva, cred)) != 0)
936 unionfs_create_uppervattr_core(ump, &lva, uvap, td);
938 if (unp->un_path == NULL)
939 panic("unionfs: un_path is null");
941 cn.cn_namelen = strlen(unp->un_path);
942 cn.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
943 bcopy(unp->un_path, cn.cn_pnbuf, cn.cn_namelen + 1);
944 cn.cn_nameiop = CREATE;
945 cn.cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
946 cn.cn_lkflags = LK_EXCLUSIVE;
949 cn.cn_nameptr = cn.cn_pnbuf;
953 if ((error = relookup(udvp, &vp, &cn)) != 0)
954 goto unionfs_vn_create_on_upper_free_out2;
963 goto unionfs_vn_create_on_upper_free_out1;
966 if ((error = VOP_LEASE(udvp, td, cred, LEASE_WRITE)) != 0)
967 goto unionfs_vn_create_on_upper_free_out1;
969 if ((error = VOP_CREATE(udvp, &vp, &cn, uvap)) != 0)
970 goto unionfs_vn_create_on_upper_free_out1;
972 if ((error = VOP_OPEN(vp, fmode, cred, td, NULL)) != 0) {
974 goto unionfs_vn_create_on_upper_free_out1;
979 unionfs_vn_create_on_upper_free_out1:
982 unionfs_vn_create_on_upper_free_out2:
983 if (cn.cn_flags & HASBUF) {
984 uma_zfree(namei_zone, cn.cn_pnbuf);
985 cn.cn_flags &= ~HASBUF;
992 * Copy from lvp to uvp.
994 * lvp and uvp should be locked and opened on entry and will be locked and
998 unionfs_copyfile_core(struct vnode *lvp, struct vnode *uvp,
999 struct ucred *cred, struct thread *td)
1010 memset(&uio, 0, sizeof(uio));
1013 uio.uio_segflg = UIO_SYSSPACE;
1016 if ((error = VOP_LEASE(lvp, td, cred, LEASE_READ)) != 0)
1018 if ((error = VOP_LEASE(uvp, td, cred, LEASE_WRITE)) != 0)
1020 buf = malloc(MAXBSIZE, M_TEMP, M_WAITOK);
1022 while (error == 0) {
1023 offset = uio.uio_offset;
1028 iov.iov_len = MAXBSIZE;
1029 uio.uio_resid = iov.iov_len;
1030 uio.uio_rw = UIO_READ;
1032 if ((error = VOP_READ(lvp, &uio, 0, cred)) != 0)
1034 if ((count = MAXBSIZE - uio.uio_resid) == 0)
1038 while (bufoffset < count) {
1041 iov.iov_base = buf + bufoffset;
1042 iov.iov_len = count - bufoffset;
1043 uio.uio_offset = offset + bufoffset;
1044 uio.uio_resid = iov.iov_len;
1045 uio.uio_rw = UIO_WRITE;
1047 if ((error = VOP_WRITE(uvp, &uio, 0, cred)) != 0)
1050 bufoffset += (count - bufoffset) - uio.uio_resid;
1053 uio.uio_offset = offset + bufoffset;
1062 * Copy file from lower to upper.
1064 * If you need copy of the contents, set 1 to docopy. Otherwise, set 0 to
1067 * If no error returned, unp will be updated.
1070 unionfs_copyfile(struct unionfs_node *unp, int docopy, struct ucred *cred,
1080 lvp = unp->un_lowervp;
1083 if ((UNIONFSTOV(unp)->v_mount->mnt_flag & MNT_RDONLY))
1085 if (unp->un_dvp == NULLVP)
1087 if (unp->un_uppervp != NULLVP)
1089 udvp = VTOUNIONFS(unp->un_dvp)->un_uppervp;
1092 if ((udvp->v_mount->mnt_flag & MNT_RDONLY))
1095 error = VOP_ACCESS(lvp, VREAD, cred, td);
1099 if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)) != 0)
1101 error = unionfs_vn_create_on_upper(&uvp, udvp, unp, &uva, td);
1103 vn_finished_write(mp);
1108 error = VOP_OPEN(lvp, FREAD, cred, td, NULL);
1110 error = unionfs_copyfile_core(lvp, uvp, cred, td);
1111 VOP_CLOSE(lvp, FREAD, cred, td);
1114 VOP_CLOSE(uvp, FWRITE, cred, td);
1115 uvp->v_writecount--;
1117 vn_finished_write(mp);
1120 /* Reset the attributes. Ignore errors. */
1122 VOP_SETATTR(uvp, &uva, cred);
1125 unionfs_node_update(unp, uvp, td);
1131 * It checks whether vp can rmdir. (check empty)
1133 * vp is unionfs vnode.
1134 * vp should be locked.
1137 unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td)
1146 struct componentname cn;
1148 * The size of buf needs to be larger than DIRBLKSIZ.
1156 ASSERT_VOP_ELOCKED(vp, "unionfs_check_rmdir");
1159 uvp = UNIONFSVPTOUPPERVP(vp);
1160 lvp = UNIONFSVPTOLOWERVP(vp);
1163 if ((error = VOP_GETATTR(uvp, &va, cred)) != 0)
1165 if (va.va_flags & OPAQUE)
1170 if ((error = mac_vnode_check_open(cred, vp, VEXEC|VREAD)) != 0)
1173 if ((error = VOP_ACCESS(vp, VEXEC|VREAD, cred, td)) != 0)
1175 if ((error = VOP_OPEN(vp, FREAD, cred, td, NULL)) != 0)
1178 uio.uio_rw = UIO_READ;
1179 uio.uio_segflg = UIO_SYSSPACE;
1184 error = mac_vnode_check_readdir(td->td_ucred, lvp);
1186 while (!error && !eofflag) {
1188 iov.iov_len = sizeof(buf);
1191 uio.uio_resid = iov.iov_len;
1193 error = VOP_READDIR(lvp, &uio, cred, &eofflag, NULL, NULL);
1196 if (eofflag == 0 && uio.uio_resid == sizeof(buf)) {
1198 panic("bad readdir response from lower FS.");
1203 edp = (struct dirent*)&buf[sizeof(buf) - uio.uio_resid];
1204 for (dp = (struct dirent*)buf; !error && dp < edp;
1205 dp = (struct dirent*)((caddr_t)dp + dp->d_reclen)) {
1206 if (dp->d_type == DT_WHT ||
1207 (dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1208 (dp->d_namlen == 2 && !bcmp(dp->d_name, "..", 2)))
1211 cn.cn_namelen = dp->d_namlen;
1213 cn.cn_nameptr = dp->d_name;
1214 cn.cn_nameiop = LOOKUP;
1215 cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
1216 cn.cn_lkflags = LK_EXCLUSIVE;
1222 * check entry in lower.
1223 * Sometimes, readdir function returns
1226 lookuperr = VOP_LOOKUP(lvp, &tvp, &cn);
1231 continue; /* skip entry */
1235 * If it has no exist/whiteout entry in upper,
1236 * directory is not empty.
1238 cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
1239 lookuperr = VOP_LOOKUP(uvp, &tvp, &cn);
1244 /* ignore exist or whiteout entry */
1246 (lookuperr == ENOENT && (cn.cn_flags & ISWHITEOUT)))
1254 VOP_CLOSE(vp, FREAD, cred, td);
1262 unionfs_checkuppervp(struct vnode *vp, char *fil, int lno)
1264 struct unionfs_node *unp;
1266 unp = VTOUNIONFS(vp);
1269 if (vp->v_op != unionfs_vnodeop_p) {
1270 printf("unionfs_checkuppervp: on non-unionfs-node.\n");
1272 kdb_enter(KDB_WHY_UNIONFS,
1273 "unionfs_checkuppervp: on non-unionfs-node.\n");
1275 panic("unionfs_checkuppervp");
1278 return (unp->un_uppervp);
1282 unionfs_checklowervp(struct vnode *vp, char *fil, int lno)
1284 struct unionfs_node *unp;
1286 unp = VTOUNIONFS(vp);
1289 if (vp->v_op != unionfs_vnodeop_p) {
1290 printf("unionfs_checklowervp: on non-unionfs-node.\n");
1292 kdb_enter(KDB_WHY_UNIONFS,
1293 "unionfs_checklowervp: on non-unionfs-node.\n");
1295 panic("unionfs_checklowervp");
1298 return (unp->un_lowervp);