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5e5861b9c6
files are off the vendor branch, so this should not change anything. A "U" marker generally means that the file was not changed in between the 4.4Lite and Lite-2 releases, and does not need a merge. "C" generally means that there was a change. [two new auxillary files in miscfs/union]
1545 lines
34 KiB
C
1545 lines
34 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994 The Regents of the University of California.
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* Copyright (c) 1992, 1993, 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 contributed 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_vnops.c 8.6 (Berkeley) 2/17/94
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* $Id: union_vnops.c,v 1.13 1995/11/09 08:16:38 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/buf.h>
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#include <sys/queue.h>
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#include <miscfs/union/union.h>
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/* FIXUP throws the lock on the uppervp vnode if the union_node is already
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* locked and the uppervp vnode is not. Before, this was thrown regardless
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* of the state of the union_node which resulted in locked vnodes which
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* were never unlocked (since the union would never be unlocked).
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*/
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#define FIXUP(un) { \
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if (((un)->un_flags & (UN_LOCKED|UN_ULOCK)) == UN_LOCKED) { \
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union_fixup(un); \
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} \
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}
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extern int union_abortop __P((struct vop_abortop_args *ap));
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extern int union_access __P((struct vop_access_args *ap));
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extern int union_advlock __P((struct vop_advlock_args *ap));
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extern int union_bmap __P((struct vop_bmap_args *ap));
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extern int union_close __P((struct vop_close_args *ap));
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extern int union_create __P((struct vop_create_args *ap));
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static void union_fixup __P((struct union_node *un));
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extern int union_fsync __P((struct vop_fsync_args *ap));
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extern int union_getattr __P((struct vop_getattr_args *ap));
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extern int union_inactive __P((struct vop_inactive_args *ap));
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extern int union_ioctl __P((struct vop_ioctl_args *ap));
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extern int union_islocked __P((struct vop_islocked_args *ap));
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extern int union_link __P((struct vop_link_args *ap));
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extern int union_lock __P((struct vop_lock_args *ap));
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extern int union_lookup __P((struct vop_lookup_args *ap));
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static int union_lookup1 __P((struct vnode *udvp, struct vnode *dvp,
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struct vnode **vpp,
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struct componentname *cnp));
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extern int union_mkdir __P((struct vop_mkdir_args *ap));
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extern int union_mknod __P((struct vop_mknod_args *ap));
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extern int union_mmap __P((struct vop_mmap_args *ap));
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extern int union_open __P((struct vop_open_args *ap));
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extern int union_pathconf __P((struct vop_pathconf_args *ap));
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extern int union_print __P((struct vop_print_args *ap));
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extern int union_read __P((struct vop_read_args *ap));
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extern int union_readdir __P((struct vop_readdir_args *ap));
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extern int union_readlink __P((struct vop_readlink_args *ap));
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extern int union_reclaim __P((struct vop_reclaim_args *ap));
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extern int union_remove __P((struct vop_remove_args *ap));
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extern int union_rename __P((struct vop_rename_args *ap));
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extern int union_rmdir __P((struct vop_rmdir_args *ap));
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extern int union_seek __P((struct vop_seek_args *ap));
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extern int union_select __P((struct vop_select_args *ap));
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extern int union_setattr __P((struct vop_setattr_args *ap));
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extern int union_strategy __P((struct vop_strategy_args *ap));
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extern int union_symlink __P((struct vop_symlink_args *ap));
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extern int union_unlock __P((struct vop_lock_args *ap));
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extern int union_write __P((struct vop_read_args *ap));
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static void
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union_fixup(un)
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struct union_node *un;
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{
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VOP_LOCK(un->un_uppervp);
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un->un_flags |= UN_ULOCK;
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}
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static int
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union_lookup1(udvp, dvp, vpp, cnp)
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struct vnode *udvp;
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struct vnode *dvp;
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struct vnode **vpp;
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struct componentname *cnp;
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{
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int error;
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struct vnode *tdvp;
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struct mount *mp;
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/*
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* If stepping up the directory tree, check for going
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* back across the mount point, in which case do what
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* lookup would do by stepping back down the mount
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* hierarchy.
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*/
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if (cnp->cn_flags & ISDOTDOT) {
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for (;;) {
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/*
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* Don't do the NOCROSSMOUNT check
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* at this level. By definition,
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* union fs deals with namespaces, not
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* filesystems.
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*/
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if ((dvp->v_flag & VROOT) == 0)
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break;
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tdvp = dvp;
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dvp = dvp->v_mount->mnt_vnodecovered;
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vput(tdvp);
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VREF(dvp);
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VOP_LOCK(dvp);
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}
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}
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error = VOP_LOOKUP(dvp, &tdvp, cnp);
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if (error)
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return (error);
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/*
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* The parent directory will have been unlocked, unless lookup
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* found the last component. In which case, re-lock the node
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* here to allow it to be unlocked again (phew) in union_lookup.
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*/
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if (dvp != tdvp && !(cnp->cn_flags & ISLASTCN))
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VOP_LOCK(dvp);
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dvp = tdvp;
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/*
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* Lastly check if the current node is a mount point in
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* which case walk up the mount hierarchy making sure not to
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* bump into the root of the mount tree (ie. dvp != udvp).
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*/
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while (dvp != udvp && (dvp->v_type == VDIR) &&
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(mp = dvp->v_mountedhere)) {
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if (mp->mnt_flag & MNT_MLOCK) {
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mp->mnt_flag |= MNT_MWAIT;
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(void) tsleep((caddr_t) mp, PVFS, "unlkup", 0);
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continue;
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}
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error = VFS_ROOT(mp, &tdvp);
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if (error) {
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vput(dvp);
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return (error);
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}
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vput(dvp);
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dvp = tdvp;
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}
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*vpp = dvp;
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return (0);
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}
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int
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union_lookup(ap)
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struct vop_lookup_args /* {
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struct vnodeop_desc *a_desc;
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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int error;
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int uerror, lerror;
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struct vnode *uppervp, *lowervp;
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struct vnode *upperdvp, *lowerdvp;
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struct vnode *dvp = ap->a_dvp;
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struct union_node *dun = VTOUNION(dvp);
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struct componentname *cnp = ap->a_cnp;
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int lockparent = cnp->cn_flags & LOCKPARENT;
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struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount);
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struct ucred *saved_cred = 0;
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cnp->cn_flags |= LOCKPARENT;
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upperdvp = dun->un_uppervp;
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lowerdvp = dun->un_lowervp;
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uppervp = NULLVP;
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lowervp = NULLVP;
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/*
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* do the lookup in the upper level.
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* if that level comsumes additional pathnames,
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* then assume that something special is going
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* on and just return that vnode.
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*/
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if (upperdvp) {
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FIXUP(dun);
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uerror = union_lookup1(um->um_uppervp, upperdvp,
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&uppervp, cnp);
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/*if (uppervp == upperdvp)
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dun->un_flags |= UN_KLOCK;*/
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if (cnp->cn_consume != 0) {
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*ap->a_vpp = uppervp;
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if (!lockparent)
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cnp->cn_flags &= ~LOCKPARENT;
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return (uerror);
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}
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} else {
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uerror = ENOENT;
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}
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/*
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* in a similar way to the upper layer, do the lookup
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* in the lower layer. this time, if there is some
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* component magic going on, then vput whatever we got
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* back from the upper layer and return the lower vnode
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* instead.
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*/
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if (lowerdvp) {
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int nameiop;
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VOP_LOCK(lowerdvp);
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/*
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* Only do a LOOKUP on the bottom node, since
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* we won't be making changes to it anyway.
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*/
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nameiop = cnp->cn_nameiop;
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cnp->cn_nameiop = LOOKUP;
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if (um->um_op == UNMNT_BELOW) {
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saved_cred = cnp->cn_cred;
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cnp->cn_cred = um->um_cred;
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}
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lerror = union_lookup1(um->um_lowervp, lowerdvp,
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&lowervp, cnp);
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if (um->um_op == UNMNT_BELOW)
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cnp->cn_cred = saved_cred;
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cnp->cn_nameiop = nameiop;
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if (lowervp != lowerdvp)
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VOP_UNLOCK(lowerdvp);
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if (cnp->cn_consume != 0) {
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if (uppervp) {
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if (uppervp == upperdvp)
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vrele(uppervp);
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else
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vput(uppervp);
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uppervp = NULLVP;
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}
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*ap->a_vpp = lowervp;
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if (!lockparent)
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cnp->cn_flags &= ~LOCKPARENT;
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return (lerror);
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}
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} else {
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lerror = ENOENT;
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}
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if (!lockparent)
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cnp->cn_flags &= ~LOCKPARENT;
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/*
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* at this point, we have uerror and lerror indicating
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* possible errors with the lookups in the upper and lower
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* layers. additionally, uppervp and lowervp are (locked)
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* references to existing vnodes in the upper and lower layers.
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*
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* there are now three cases to consider.
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* 1. if both layers returned an error, then return whatever
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* error the upper layer generated.
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*
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* 2. if the top layer failed and the bottom layer succeeded
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* then two subcases occur.
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* a. the bottom vnode is not a directory, in which
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* case just return a new union vnode referencing
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* an empty top layer and the existing bottom layer.
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* b. the bottom vnode is a directory, in which case
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* create a new directory in the top-level and
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* continue as in case 3.
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*
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* 3. if the top layer succeeded then return a new union
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* vnode referencing whatever the new top layer and
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* whatever the bottom layer returned.
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*/
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*ap->a_vpp = NULLVP;
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/* case 1. */
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if ((uerror != 0) && (lerror != 0)) {
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return (uerror);
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}
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/* case 2. */
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if (uerror != 0 /* && (lerror == 0) */ ) {
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if (lowervp->v_type == VDIR) { /* case 2b. */
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dun->un_flags &= ~UN_ULOCK;
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VOP_UNLOCK(upperdvp);
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uerror = union_mkshadow(um, upperdvp, cnp, &uppervp);
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VOP_LOCK(upperdvp);
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dun->un_flags |= UN_ULOCK;
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if (uerror) {
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if (lowervp) {
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vput(lowervp);
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lowervp = NULLVP;
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}
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return (uerror);
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}
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}
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}
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if (lowervp)
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VOP_UNLOCK(lowervp);
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error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp,
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uppervp, lowervp);
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if (error) {
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if (uppervp)
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vput(uppervp);
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if (lowervp)
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vrele(lowervp);
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} else {
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if (*ap->a_vpp != dvp)
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if (!lockparent || !(cnp->cn_flags & ISLASTCN))
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VOP_UNLOCK(dvp);
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}
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return (error);
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}
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|
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int
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union_create(ap)
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struct vop_create_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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struct vattr *a_vap;
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} */ *ap;
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{
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struct union_node *un = VTOUNION(ap->a_dvp);
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struct vnode *dvp = un->un_uppervp;
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if (dvp) {
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int error;
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struct vnode *vp;
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FIXUP(un);
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VREF(dvp);
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un->un_flags |= UN_KLOCK;
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vput(ap->a_dvp);
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error = VOP_CREATE(dvp, &vp, ap->a_cnp, ap->a_vap);
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if (error)
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return (error);
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error = union_allocvp(
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ap->a_vpp,
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ap->a_dvp->v_mount,
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ap->a_dvp,
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NULLVP,
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ap->a_cnp,
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vp,
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NULLVP);
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if (error)
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vput(vp);
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return (error);
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}
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|
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vput(ap->a_dvp);
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return (EROFS);
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}
|
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|
|
int
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union_mknod(ap)
|
|
struct vop_mknod_args /* {
|
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struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
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} */ *ap;
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{
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struct union_node *un = VTOUNION(ap->a_dvp);
|
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struct vnode *dvp = un->un_uppervp;
|
|
|
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if (dvp) {
|
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int error;
|
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struct vnode *vp;
|
|
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FIXUP(un);
|
|
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VREF(dvp);
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un->un_flags |= UN_KLOCK;
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vput(ap->a_dvp);
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error = VOP_MKNOD(dvp, &vp, ap->a_cnp, ap->a_vap);
|
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if (error)
|
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return (error);
|
|
|
|
if (vp) {
|
|
error = union_allocvp(
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ap->a_vpp,
|
|
ap->a_dvp->v_mount,
|
|
ap->a_dvp,
|
|
NULLVP,
|
|
ap->a_cnp,
|
|
vp,
|
|
NULLVP);
|
|
if (error)
|
|
vput(vp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
vput(ap->a_dvp);
|
|
return (EROFS);
|
|
}
|
|
|
|
int
|
|
union_open(ap)
|
|
struct vop_open_args /* {
|
|
struct vnodeop_desc *a_desc;
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *tvp;
|
|
int mode = ap->a_mode;
|
|
struct ucred *cred = ap->a_cred;
|
|
struct proc *p = ap->a_p;
|
|
int error;
|
|
|
|
/*
|
|
* If there is an existing upper vp then simply open that.
|
|
*/
|
|
tvp = un->un_uppervp;
|
|
if (tvp == NULLVP) {
|
|
/*
|
|
* If the lower vnode is being opened for writing, then
|
|
* copy the file contents to the upper vnode and open that,
|
|
* otherwise can simply open the lower vnode.
|
|
*/
|
|
tvp = un->un_lowervp;
|
|
if ((ap->a_mode & FWRITE) && (tvp->v_type == VREG)) {
|
|
struct vnode *vp;
|
|
int i;
|
|
|
|
/*
|
|
* Open the named file in the upper layer. Note that
|
|
* the file may have come into existence *since* the
|
|
* lookup was done, since the upper layer may really
|
|
* be a loopback mount of some other filesystem...
|
|
* so open the file with exclusive create and barf if
|
|
* it already exists.
|
|
* XXX - perhaps should re-lookup the node (once more
|
|
* with feeling) and simply open that. Who knows.
|
|
*/
|
|
error = union_vn_create(&vp, un, p);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* at this point, uppervp is locked */
|
|
union_newupper(un, vp);
|
|
un->un_flags |= UN_ULOCK;
|
|
|
|
/*
|
|
* Now, if the file is being opened with truncation,
|
|
* then the (new) upper vnode is ready to fly,
|
|
* otherwise the data from the lower vnode must be
|
|
* copied to the upper layer first. This only works
|
|
* for regular files (check is made above).
|
|
*/
|
|
if ((mode & O_TRUNC) == 0) {
|
|
/*
|
|
* XXX - should not ignore errors
|
|
* from VOP_CLOSE
|
|
*/
|
|
VOP_LOCK(tvp);
|
|
error = VOP_OPEN(tvp, FREAD, cred, p);
|
|
if (error == 0) {
|
|
error = union_copyfile(p, cred,
|
|
tvp, un->un_uppervp);
|
|
VOP_UNLOCK(tvp);
|
|
(void) VOP_CLOSE(tvp, FREAD, cred, p);
|
|
} else {
|
|
VOP_UNLOCK(tvp);
|
|
}
|
|
|
|
#ifdef UNION_DIAGNOSTIC
|
|
if (!error)
|
|
uprintf("union: copied up %s\n",
|
|
un->un_path);
|
|
#endif
|
|
}
|
|
|
|
un->un_flags &= ~UN_ULOCK;
|
|
VOP_UNLOCK(un->un_uppervp);
|
|
union_vn_close(un->un_uppervp, FWRITE, cred, p);
|
|
VOP_LOCK(un->un_uppervp);
|
|
un->un_flags |= UN_ULOCK;
|
|
|
|
/*
|
|
* Subsequent IOs will go to the top layer, so
|
|
* call close on the lower vnode and open on the
|
|
* upper vnode to ensure that the filesystem keeps
|
|
* its references counts right. This doesn't do
|
|
* the right thing with (cred) and (FREAD) though.
|
|
* Ignoring error returns is not righ, either.
|
|
*/
|
|
for (i = 0; i < un->un_openl; i++) {
|
|
(void) VOP_CLOSE(tvp, FREAD, cred, p);
|
|
(void) VOP_OPEN(un->un_uppervp, FREAD, cred, p);
|
|
}
|
|
un->un_openl = 0;
|
|
|
|
if (error == 0)
|
|
error = VOP_OPEN(un->un_uppervp, mode, cred, p);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Just open the lower vnode
|
|
*/
|
|
un->un_openl++;
|
|
VOP_LOCK(tvp);
|
|
error = VOP_OPEN(tvp, mode, cred, p);
|
|
VOP_UNLOCK(tvp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
FIXUP(un);
|
|
|
|
error = VOP_OPEN(tvp, mode, cred, p);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
if (un->un_uppervp) {
|
|
vp = un->un_uppervp;
|
|
} else {
|
|
#ifdef UNION_DIAGNOSTIC
|
|
if (un->un_openl <= 0)
|
|
panic("union: un_openl cnt");
|
|
#endif
|
|
--un->un_openl;
|
|
vp = un->un_lowervp;
|
|
}
|
|
|
|
return (VOP_CLOSE(vp, ap->a_fflag, ap->a_cred, ap->a_p));
|
|
}
|
|
|
|
/*
|
|
* Check access permission on the union vnode.
|
|
* The access check being enforced is to check
|
|
* against both the underlying vnode, and any
|
|
* copied vnode. This ensures that no additional
|
|
* file permissions are given away simply because
|
|
* the user caused an implicit file copy.
|
|
*/
|
|
int
|
|
union_access(ap)
|
|
struct vop_access_args /* {
|
|
struct vnodeop_desc *a_desc;
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
int error = EACCES;
|
|
struct vnode *vp;
|
|
|
|
vp = un->un_uppervp;
|
|
if (vp) {
|
|
FIXUP(un);
|
|
return (VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p));
|
|
}
|
|
|
|
vp = un->un_lowervp;
|
|
if (vp) {
|
|
VOP_LOCK(vp);
|
|
error = VOP_ACCESS(vp, ap->a_mode, ap->a_cred, ap->a_p);
|
|
if (error == 0) {
|
|
struct union_mount *um = MOUNTTOUNIONMOUNT(vp->v_mount);
|
|
|
|
if (um->um_op == UNMNT_BELOW)
|
|
error = VOP_ACCESS(vp, ap->a_mode,
|
|
um->um_cred, ap->a_p);
|
|
}
|
|
VOP_UNLOCK(vp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* We handle getattr only to change the fsid.
|
|
*/
|
|
int
|
|
union_getattr(ap)
|
|
struct vop_getattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp = un->un_uppervp;
|
|
struct vattr *vap;
|
|
struct vattr va;
|
|
|
|
|
|
/*
|
|
* Some programs walk the filesystem hierarchy by counting
|
|
* links to directories to avoid stat'ing all the time.
|
|
* This means the link count on directories needs to be "correct".
|
|
* The only way to do that is to call getattr on both layers
|
|
* and fix up the link count. The link count will not necessarily
|
|
* be accurate but will be large enough to defeat the tree walkers.
|
|
*/
|
|
|
|
vap = ap->a_vap;
|
|
|
|
vp = un->un_uppervp;
|
|
if (vp != NULLVP) {
|
|
FIXUP(un);
|
|
error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
if (vp == NULLVP) {
|
|
vp = un->un_lowervp;
|
|
} else if (vp->v_type == VDIR) {
|
|
vp = un->un_lowervp;
|
|
vap = &va;
|
|
} else {
|
|
vp = NULLVP;
|
|
}
|
|
|
|
if (vp != NULLVP) {
|
|
VOP_LOCK(vp);
|
|
error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_p);
|
|
VOP_UNLOCK(vp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
if ((vap != ap->a_vap) && (vap->va_type == VDIR))
|
|
ap->a_vap->va_nlink += vap->va_nlink;
|
|
|
|
vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_setattr(ap)
|
|
struct vop_setattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
int error;
|
|
|
|
/*
|
|
* Handle case of truncating lower object to zero size,
|
|
* by creating a zero length upper object. This is to
|
|
* handle the case of open with O_TRUNC and O_CREAT.
|
|
*/
|
|
if ((un->un_uppervp == NULLVP) &&
|
|
/* assert(un->un_lowervp != NULLVP) */
|
|
(un->un_lowervp->v_type == VREG) &&
|
|
(ap->a_vap->va_size == 0)) {
|
|
struct vnode *vp;
|
|
|
|
error = union_vn_create(&vp, un, ap->a_p);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* at this point, uppervp is locked */
|
|
union_newupper(un, vp);
|
|
|
|
VOP_UNLOCK(vp);
|
|
union_vn_close(un->un_uppervp, FWRITE, ap->a_cred, ap->a_p);
|
|
VOP_LOCK(vp);
|
|
un->un_flags |= UN_ULOCK;
|
|
}
|
|
|
|
/*
|
|
* Try to set attributes in upper layer,
|
|
* otherwise return read-only filesystem error.
|
|
*/
|
|
if (un->un_uppervp != NULLVP) {
|
|
FIXUP(un);
|
|
error = VOP_SETATTR(un->un_uppervp, ap->a_vap,
|
|
ap->a_cred, ap->a_p);
|
|
} else {
|
|
error = EROFS;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_read(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_vp);
|
|
int dolock = (vp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_READ(vp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
if (dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_write(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_vp);
|
|
int dolock = (vp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_WRITE(vp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
if (dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_ioctl(ap)
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
int a_command;
|
|
caddr_t a_data;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (VOP_IOCTL(OTHERVP(ap->a_vp), ap->a_command, ap->a_data,
|
|
ap->a_fflag, ap->a_cred, ap->a_p));
|
|
}
|
|
|
|
int
|
|
union_select(ap)
|
|
struct vop_select_args /* {
|
|
struct vnode *a_vp;
|
|
int a_which;
|
|
int a_fflags;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (VOP_SELECT(OTHERVP(ap->a_vp), ap->a_which, ap->a_fflags,
|
|
ap->a_cred, ap->a_p));
|
|
}
|
|
|
|
int
|
|
union_mmap(ap)
|
|
struct vop_mmap_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflags;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (VOP_MMAP(OTHERVP(ap->a_vp), ap->a_fflags,
|
|
ap->a_cred, ap->a_p));
|
|
}
|
|
|
|
int
|
|
union_fsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
int error = 0;
|
|
struct vnode *targetvp = OTHERVP(ap->a_vp);
|
|
|
|
if (targetvp) {
|
|
int dolock = (targetvp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(targetvp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_FSYNC(targetvp, ap->a_cred,
|
|
ap->a_waitfor, ap->a_p);
|
|
if (dolock)
|
|
VOP_UNLOCK(targetvp);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_seek(ap)
|
|
struct vop_seek_args /* {
|
|
struct vnode *a_vp;
|
|
off_t a_oldoff;
|
|
off_t a_newoff;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (VOP_SEEK(OTHERVP(ap->a_vp), ap->a_oldoff, ap->a_newoff, ap->a_cred));
|
|
}
|
|
|
|
int
|
|
union_remove(ap)
|
|
struct vop_remove_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
if (dun->un_uppervp && un->un_uppervp) {
|
|
struct vnode *dvp = dun->un_uppervp;
|
|
struct vnode *vp = un->un_uppervp;
|
|
|
|
FIXUP(dun);
|
|
VREF(dvp);
|
|
dun->un_flags |= UN_KLOCK;
|
|
vput(ap->a_dvp);
|
|
FIXUP(un);
|
|
VREF(vp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_vp);
|
|
|
|
error = VOP_REMOVE(dvp, vp, ap->a_cnp);
|
|
if (!error)
|
|
union_removed_upper(un);
|
|
|
|
/*
|
|
* XXX: should create a whiteout here
|
|
*/
|
|
} else {
|
|
/*
|
|
* XXX: should create a whiteout here
|
|
*/
|
|
vput(ap->a_dvp);
|
|
vput(ap->a_vp);
|
|
error = EROFS;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_link(ap)
|
|
struct vop_link_args /* {
|
|
struct vnode *a_tdvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *dun = VTOUNION(ap->a_vp);
|
|
struct union_node *un = VTOUNION(ap->a_tdvp);
|
|
|
|
if (dun->un_uppervp && un->un_uppervp) {
|
|
struct vnode *dvp = dun->un_uppervp;
|
|
struct vnode *vp = un->un_uppervp;
|
|
|
|
FIXUP(dun);
|
|
VREF(dvp);
|
|
dun->un_flags |= UN_KLOCK;
|
|
vput(ap->a_vp);
|
|
FIXUP(un);
|
|
VREF(vp);
|
|
vrele(ap->a_tdvp);
|
|
|
|
error = VOP_LINK(dvp, vp, ap->a_cnp);
|
|
} else {
|
|
/*
|
|
* XXX: need to copy to upper layer
|
|
* and do the link there.
|
|
*/
|
|
vput(ap->a_vp);
|
|
vrele(ap->a_tdvp);
|
|
error = EROFS;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_rename(ap)
|
|
struct vop_rename_args /* {
|
|
struct vnode *a_fdvp;
|
|
struct vnode *a_fvp;
|
|
struct componentname *a_fcnp;
|
|
struct vnode *a_tdvp;
|
|
struct vnode *a_tvp;
|
|
struct componentname *a_tcnp;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
|
|
struct vnode *fdvp = ap->a_fdvp;
|
|
struct vnode *fvp = ap->a_fvp;
|
|
struct vnode *tdvp = ap->a_tdvp;
|
|
struct vnode *tvp = ap->a_tvp;
|
|
|
|
if (fdvp->v_op == union_vnodeop_p) { /* always true */
|
|
struct union_node *un = VTOUNION(fdvp);
|
|
if (un->un_uppervp == NULLVP) {
|
|
error = EROFS;
|
|
goto bad;
|
|
}
|
|
|
|
FIXUP(un);
|
|
fdvp = un->un_uppervp;
|
|
VREF(fdvp);
|
|
vrele(ap->a_fdvp);
|
|
}
|
|
|
|
if (fvp->v_op == union_vnodeop_p) { /* always true */
|
|
struct union_node *un = VTOUNION(fvp);
|
|
if (un->un_uppervp == NULLVP) {
|
|
error = EROFS;
|
|
goto bad;
|
|
}
|
|
|
|
FIXUP(un);
|
|
fvp = un->un_uppervp;
|
|
VREF(fvp);
|
|
vrele(ap->a_fvp);
|
|
}
|
|
|
|
if (tdvp->v_op == union_vnodeop_p) {
|
|
struct union_node *un = VTOUNION(tdvp);
|
|
if (un->un_uppervp == NULLVP) {
|
|
error = EROFS;
|
|
goto bad;
|
|
}
|
|
|
|
tdvp = un->un_uppervp;
|
|
VREF(tdvp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_tdvp);
|
|
}
|
|
|
|
if (tvp && tvp->v_op == union_vnodeop_p) {
|
|
struct union_node *un = VTOUNION(tvp);
|
|
if (un->un_uppervp == NULLVP) {
|
|
error = EROFS;
|
|
goto bad;
|
|
}
|
|
|
|
tvp = un->un_uppervp;
|
|
VREF(tvp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_tvp);
|
|
}
|
|
|
|
return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp));
|
|
|
|
bad:
|
|
vrele(fdvp);
|
|
vrele(fvp);
|
|
vput(tdvp);
|
|
if (tvp)
|
|
vput(tvp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_mkdir(ap)
|
|
struct vop_mkdir_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_dvp);
|
|
struct vnode *dvp = un->un_uppervp;
|
|
|
|
if (dvp) {
|
|
int error;
|
|
struct vnode *vp;
|
|
|
|
FIXUP(un);
|
|
VREF(dvp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_dvp);
|
|
error = VOP_MKDIR(dvp, &vp, ap->a_cnp, ap->a_vap);
|
|
if (error)
|
|
return (error);
|
|
|
|
error = union_allocvp(
|
|
ap->a_vpp,
|
|
ap->a_dvp->v_mount,
|
|
ap->a_dvp,
|
|
NULLVP,
|
|
ap->a_cnp,
|
|
vp,
|
|
NULLVP);
|
|
if (error)
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
|
|
vput(ap->a_dvp);
|
|
return (EROFS);
|
|
}
|
|
|
|
int
|
|
union_rmdir(ap)
|
|
struct vop_rmdir_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
if (dun->un_uppervp && un->un_uppervp) {
|
|
struct vnode *dvp = dun->un_uppervp;
|
|
struct vnode *vp = un->un_uppervp;
|
|
|
|
FIXUP(dun);
|
|
VREF(dvp);
|
|
dun->un_flags |= UN_KLOCK;
|
|
vput(ap->a_dvp);
|
|
FIXUP(un);
|
|
VREF(vp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_vp);
|
|
|
|
error = VOP_RMDIR(dvp, vp, ap->a_cnp);
|
|
if (!error)
|
|
union_removed_upper(un);
|
|
|
|
/*
|
|
* XXX: should create a whiteout here
|
|
*/
|
|
} else {
|
|
/*
|
|
* XXX: should create a whiteout here
|
|
*/
|
|
vput(ap->a_dvp);
|
|
vput(ap->a_vp);
|
|
error = EROFS;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_symlink(ap)
|
|
struct vop_symlink_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
char *a_target;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_dvp);
|
|
struct vnode *dvp = un->un_uppervp;
|
|
|
|
if (dvp) {
|
|
int error;
|
|
struct vnode *vp;
|
|
|
|
FIXUP(un);
|
|
VREF(dvp);
|
|
un->un_flags |= UN_KLOCK;
|
|
vput(ap->a_dvp);
|
|
error = VOP_SYMLINK(dvp, &vp, ap->a_cnp,
|
|
ap->a_vap, ap->a_target);
|
|
*ap->a_vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
|
|
vput(ap->a_dvp);
|
|
return (EROFS);
|
|
}
|
|
|
|
/*
|
|
* union_readdir works in concert with getdirentries and
|
|
* readdir(3) to provide a list of entries in the unioned
|
|
* directories. getdirentries is responsible for walking
|
|
* down the union stack. readdir(3) is responsible for
|
|
* eliminating duplicate names from the returned data stream.
|
|
*/
|
|
int
|
|
union_readdir(ap)
|
|
struct vop_readdir_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
int error = 0;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
if (un->un_uppervp) {
|
|
FIXUP(un);
|
|
error = VOP_READDIR(un->un_uppervp, ap->a_uio, ap->a_cred, NULL, NULL, NULL);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_readlink(ap)
|
|
struct vop_readlink_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_vp);
|
|
int dolock = (vp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_READLINK(vp, ap->a_uio, ap->a_cred);
|
|
if (dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_abortop(ap)
|
|
struct vop_abortop_args /* {
|
|
struct vnode *a_dvp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_dvp);
|
|
struct union_node *un = VTOUNION(ap->a_dvp);
|
|
int islocked = un->un_flags & UN_LOCKED;
|
|
int dolock = (vp == LOWERVP(ap->a_dvp));
|
|
|
|
if (islocked) {
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_dvp));
|
|
}
|
|
error = VOP_ABORTOP(vp, ap->a_cnp);
|
|
if (islocked && dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
/*
|
|
* Do nothing (and _don't_ bypass).
|
|
* Wait to vrele lowervp until reclaim,
|
|
* so that until then our union_node is in the
|
|
* cache and reusable.
|
|
*
|
|
* NEEDSWORK: Someday, consider inactive'ing
|
|
* the lowervp and then trying to reactivate it
|
|
* with capabilities (v_id)
|
|
* like they do in the name lookup cache code.
|
|
* That's too much work for now.
|
|
*/
|
|
|
|
#ifdef UNION_DIAGNOSTIC
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
if (un->un_flags & UN_LOCKED)
|
|
panic("union: inactivating locked node");
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_reclaim(ap)
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
union_freevp(ap->a_vp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_lock(ap)
|
|
struct vop_lock_args *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct union_node *un;
|
|
|
|
start:
|
|
while (vp->v_flag & VXLOCK) {
|
|
vp->v_flag |= VXWANT;
|
|
(void) tsleep((caddr_t)vp, PINOD, "unnlk1", 0);
|
|
}
|
|
|
|
un = VTOUNION(vp);
|
|
|
|
if (un->un_uppervp) {
|
|
if ((un->un_flags & UN_ULOCK) == 0) {
|
|
un->un_flags |= UN_ULOCK;
|
|
VOP_LOCK(un->un_uppervp);
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (un->un_flags & UN_KLOCK)
|
|
panic("union: dangling upper lock");
|
|
#endif
|
|
}
|
|
|
|
if (un->un_flags & UN_LOCKED) {
|
|
#ifdef DIAGNOSTIC
|
|
if (curproc && un->un_pid == curproc->p_pid &&
|
|
un->un_pid > -1 && curproc->p_pid > -1)
|
|
panic("union: locking against myself");
|
|
#endif
|
|
un->un_flags |= UN_WANT;
|
|
(void) tsleep((caddr_t) &un->un_flags, PINOD, "unnlk2", 0);
|
|
goto start;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (curproc)
|
|
un->un_pid = curproc->p_pid;
|
|
else
|
|
un->un_pid = -1;
|
|
#endif
|
|
|
|
un->un_flags |= UN_LOCKED;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_unlock(ap)
|
|
struct vop_lock_args *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((un->un_flags & UN_LOCKED) == 0)
|
|
panic("union: unlock unlocked node");
|
|
if (curproc && un->un_pid != curproc->p_pid &&
|
|
curproc->p_pid > -1 && un->un_pid > -1)
|
|
panic("union: unlocking other process's union node");
|
|
#endif
|
|
|
|
un->un_flags &= ~UN_LOCKED;
|
|
|
|
if ((un->un_flags & (UN_ULOCK|UN_KLOCK)) == UN_ULOCK)
|
|
VOP_UNLOCK(un->un_uppervp);
|
|
|
|
un->un_flags &= ~(UN_ULOCK|UN_KLOCK);
|
|
|
|
if (un->un_flags & UN_WANT) {
|
|
un->un_flags &= ~UN_WANT;
|
|
wakeup((caddr_t) &un->un_flags);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
un->un_pid = 0;
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_bmap(ap)
|
|
struct vop_bmap_args /* {
|
|
struct vnode *a_vp;
|
|
daddr_t a_bn;
|
|
struct vnode **a_vpp;
|
|
daddr_t *a_bnp;
|
|
int *a_runp;
|
|
int *a_runb;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_vp);
|
|
int dolock = (vp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_BMAP(vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb);
|
|
if (dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
printf("\ttag VT_UNION, vp=%p, uppervp=%p, lowervp=%p\n",
|
|
vp, UPPERVP(vp), LOWERVP(vp));
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
union_islocked(ap)
|
|
struct vop_islocked_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
return ((VTOUNION(ap->a_vp)->un_flags & UN_LOCKED) ? 1 : 0);
|
|
}
|
|
|
|
int
|
|
union_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct vnode *vp = OTHERVP(ap->a_vp);
|
|
int dolock = (vp == LOWERVP(ap->a_vp));
|
|
|
|
if (dolock)
|
|
VOP_LOCK(vp);
|
|
else
|
|
FIXUP(VTOUNION(ap->a_vp));
|
|
error = VOP_PATHCONF(vp, ap->a_name, ap->a_retval);
|
|
if (dolock)
|
|
VOP_UNLOCK(vp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
union_advlock(ap)
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
|
|
return (VOP_ADVLOCK(OTHERVP(ap->a_vp), ap->a_id, ap->a_op,
|
|
ap->a_fl, ap->a_flags));
|
|
}
|
|
|
|
|
|
/*
|
|
* XXX - vop_strategy must be hand coded because it has no
|
|
* vnode in its arguments.
|
|
* This goes away with a merged VM/buffer cache.
|
|
*/
|
|
int
|
|
union_strategy(ap)
|
|
struct vop_strategy_args /* {
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
struct buf *bp = ap->a_bp;
|
|
int error;
|
|
struct vnode *savedvp;
|
|
|
|
savedvp = bp->b_vp;
|
|
bp->b_vp = OTHERVP(bp->b_vp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (bp->b_vp == NULLVP)
|
|
panic("union_strategy: nil vp");
|
|
if (((bp->b_flags & B_READ) == 0) &&
|
|
(bp->b_vp == LOWERVP(savedvp)))
|
|
panic("union_strategy: writing to lowervp");
|
|
#endif
|
|
|
|
error = VOP_STRATEGY(bp);
|
|
bp->b_vp = savedvp;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Global vfs data structures
|
|
*/
|
|
vop_t **union_vnodeop_p;
|
|
struct vnodeopv_entry_desc union_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *)vn_default_error },
|
|
{ &vop_lookup_desc, (vop_t *)union_lookup }, /* lookup */
|
|
{ &vop_create_desc, (vop_t *)union_create }, /* create */
|
|
{ &vop_mknod_desc, (vop_t *)union_mknod }, /* mknod */
|
|
{ &vop_open_desc, (vop_t *)union_open }, /* open */
|
|
{ &vop_close_desc, (vop_t *)union_close }, /* close */
|
|
{ &vop_access_desc, (vop_t *)union_access }, /* access */
|
|
{ &vop_getattr_desc, (vop_t *)union_getattr }, /* getattr */
|
|
{ &vop_setattr_desc, (vop_t *)union_setattr }, /* setattr */
|
|
{ &vop_read_desc, (vop_t *)union_read }, /* read */
|
|
{ &vop_write_desc, (vop_t *)union_write }, /* write */
|
|
{ &vop_ioctl_desc, (vop_t *)union_ioctl }, /* ioctl */
|
|
{ &vop_select_desc, (vop_t *)union_select }, /* select */
|
|
{ &vop_mmap_desc, (vop_t *)union_mmap }, /* mmap */
|
|
{ &vop_fsync_desc, (vop_t *)union_fsync }, /* fsync */
|
|
{ &vop_seek_desc, (vop_t *)union_seek }, /* seek */
|
|
{ &vop_remove_desc, (vop_t *)union_remove }, /* remove */
|
|
{ &vop_link_desc, (vop_t *)union_link }, /* link */
|
|
{ &vop_rename_desc, (vop_t *)union_rename }, /* rename */
|
|
{ &vop_mkdir_desc, (vop_t *)union_mkdir }, /* mkdir */
|
|
{ &vop_rmdir_desc, (vop_t *)union_rmdir }, /* rmdir */
|
|
{ &vop_symlink_desc, (vop_t *)union_symlink }, /* symlink */
|
|
{ &vop_readdir_desc, (vop_t *)union_readdir }, /* readdir */
|
|
{ &vop_readlink_desc, (vop_t *)union_readlink }, /* readlink */
|
|
{ &vop_abortop_desc, (vop_t *)union_abortop }, /* abortop */
|
|
{ &vop_inactive_desc, (vop_t *)union_inactive }, /* inactive */
|
|
{ &vop_reclaim_desc, (vop_t *)union_reclaim }, /* reclaim */
|
|
{ &vop_lock_desc, (vop_t *)union_lock }, /* lock */
|
|
{ &vop_unlock_desc, (vop_t *)union_unlock }, /* unlock */
|
|
{ &vop_bmap_desc, (vop_t *)union_bmap }, /* bmap */
|
|
{ &vop_strategy_desc, (vop_t *)union_strategy }, /* strategy */
|
|
{ &vop_print_desc, (vop_t *)union_print }, /* print */
|
|
{ &vop_islocked_desc, (vop_t *)union_islocked }, /* islocked */
|
|
{ &vop_pathconf_desc, (vop_t *)union_pathconf }, /* pathconf */
|
|
{ &vop_advlock_desc, (vop_t *)union_advlock }, /* advlock */
|
|
#ifdef notdef
|
|
{ &vop_blkatoff_desc, (vop_t *)union_blkatoff }, /* blkatoff */
|
|
{ &vop_valloc_desc, (vop_t *)union_valloc }, /* valloc */
|
|
{ &vop_vfree_desc, (vop_t *)union_vfree }, /* vfree */
|
|
{ &vop_truncate_desc, (vop_t *)union_truncate }, /* truncate */
|
|
{ &vop_update_desc, (vop_t *)union_update }, /* update */
|
|
{ &vop_bwrite_desc, (vop_t *)union_bwrite }, /* bwrite */
|
|
#endif
|
|
{ NULL, NULL }
|
|
};
|
|
struct vnodeopv_desc union_vnodeop_opv_desc =
|
|
{ &union_vnodeop_p, union_vnodeop_entries };
|
|
|
|
VNODEOP_SET(union_vnodeop_opv_desc);
|