cb448a064d
"panic: lockmgr: using decommisioned lock" (only if DIAGNOSTIC) The problem turned out to be due to the way LK_DRAIN was (not) handled in union_lock; it just got passed through to the lock on the upper vnode (which got marked as decommissioned, instead of that happening to the union vnode. When the upper vnode was next locked (typically when it was released), it went kaboom.
137 lines
5.5 KiB
C
137 lines
5.5 KiB
C
/* $NetBSD: union.h,v 1.11 1999/08/01 00:00:57 sommerfeld Exp $ */
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/*
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* Copyright (c) 1994 The Regents of the University of California.
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* Copyright (c) 1994 Jan-Simon Pendry.
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* All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)union.h 8.9 (Berkeley) 12/10/94
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*/
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struct union_args {
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char *target; /* Target of loopback */
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int mntflags; /* Options on the mount */
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};
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#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
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#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
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#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
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#define UNMNT_OPMASK 0x0003
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struct union_mount {
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struct vnode *um_uppervp;
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struct vnode *um_lowervp;
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struct ucred *um_cred; /* Credentials of user calling mount */
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int um_cmode; /* cmask from mount process */
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int um_op; /* Operation mode */
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};
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#ifdef _KERNEL
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/*
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* DEFDIRMODE is the mode bits used to create a shadow directory.
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*/
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#define UN_DIRMODE (S_IRWXU|S_IRWXG|S_IRWXO)
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#define UN_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
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/*
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* A cache of vnode references
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*/
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struct union_node {
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LIST_ENTRY(union_node) un_cache; /* Hash chain */
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struct vnode *un_vnode; /* Back pointer */
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struct vnode *un_uppervp; /* overlaying object */
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struct vnode *un_lowervp; /* underlying object */
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struct vnode *un_dirvp; /* Parent dir of uppervp */
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struct vnode *un_pvp; /* Parent vnode */
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char *un_path; /* saved component name */
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int un_hash; /* saved un_path hash value */
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int un_openl; /* # of opens on lowervp */
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unsigned int un_flags;
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struct vnode **un_dircache; /* cached union stack */
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off_t un_uppersz; /* size of upper object */
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off_t un_lowersz; /* size of lower object */
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#ifdef DIAGNOSTIC
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pid_t un_pid;
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#endif
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};
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#define UN_WANTED 0x01
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#define UN_LOCKED 0x02
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#define UN_ULOCK 0x04 /* Upper node is locked */
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#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
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#define UN_CACHED 0x10 /* In union cache */
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#define UN_DRAINING 0x20 /* upper node lock is draining */
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#define UN_DRAINED 0x40 /* upper node lock is drained */
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extern int union_allocvp __P((struct vnode **, struct mount *,
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struct vnode *, struct vnode *,
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struct componentname *, struct vnode *,
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struct vnode *, int));
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extern int union_copyfile __P((struct vnode *, struct vnode *,
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struct ucred *, struct proc *));
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extern int union_copyup __P((struct union_node *, int, struct ucred *,
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struct proc *));
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extern void union_diruncache __P((struct union_node *));
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extern int union_dowhiteout __P((struct union_node *, struct ucred *,
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struct proc *));
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extern int union_mkshadow __P((struct union_mount *, struct vnode *,
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struct componentname *, struct vnode **));
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extern int union_mkwhiteout __P((struct union_mount *, struct vnode *,
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struct componentname *, char *));
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extern int union_vn_create __P((struct vnode **, struct union_node *,
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struct proc *));
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extern int union_cn_close __P((struct vnode *, int, struct ucred *,
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struct proc *));
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extern void union_removed_upper __P((struct union_node *un));
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extern struct vnode *union_lowervp __P((struct vnode *));
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extern void union_newlower __P((struct union_node *, struct vnode *));
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extern void union_newupper __P((struct union_node *, struct vnode *));
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extern void union_newsize __P((struct vnode *, off_t, off_t));
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#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
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#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
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#define UNIONTOV(un) ((un)->un_vnode)
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#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
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#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
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#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
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extern int (**union_vnodeop_p) __P((void *));
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extern struct vfsops union_vfsops;
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void union_init __P((void));
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int union_freevp __P((struct vnode *));
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#endif /* _KERNEL */
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