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2017 lines
47 KiB
C
2017 lines
47 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994, 1995 Jan-Simon Pendry.
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* Copyright (c) 1992, 1993, 1994, 1995
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* The Regents of the University of California. 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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* 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 8.32 (Berkeley) 6/23/95
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* $FreeBSD$
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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/fcntl.h>
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#include <sys/stat.h>
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#include <sys/kernel.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/bio.h>
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#include <sys/buf.h>
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#include <sys/lock.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <sys/acl.h>
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#include <sys/event.h>
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#include <sys/extattr.h>
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#include <sys/mac.h>
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#include <fs/unionfs/union.h>
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#include <vm/vm.h>
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#include <vm/vnode_pager.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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int uniondebug = 0;
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#if UDEBUG_ENABLED
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SYSCTL_INT(_vfs, OID_AUTO, uniondebug, CTLFLAG_RW, &uniondebug, 0, "");
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#else
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SYSCTL_INT(_vfs, OID_AUTO, uniondebug, CTLFLAG_RD, &uniondebug, 0, "");
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#endif
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static vop_access_t union_access;
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static vop_aclcheck_t union_aclcheck;
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static vop_advlock_t union_advlock;
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static vop_close_t union_close;
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static vop_closeextattr_t union_closeextattr;
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static vop_create_t union_create;
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static vop_deleteextattr_t union_deleteextattr;
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static vop_fsync_t union_fsync;
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static vop_getacl_t union_getacl;
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static vop_getattr_t union_getattr;
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static vop_getextattr_t union_getextattr;
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static vop_inactive_t union_inactive;
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static vop_ioctl_t union_ioctl;
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static vop_lease_t union_lease;
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static vop_link_t union_link;
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static vop_listextattr_t union_listextattr;
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static vop_lookup_t union_lookup;
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static int union_lookup1(struct vnode *udvp, struct vnode **dvp,
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struct vnode **vpp,
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struct componentname *cnp);
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static vop_mkdir_t union_mkdir;
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static vop_mknod_t union_mknod;
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static vop_open_t union_open;
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static vop_openextattr_t union_openextattr;
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static vop_pathconf_t union_pathconf;
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static vop_print_t union_print;
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static vop_read_t union_read;
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static vop_readdir_t union_readdir;
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static vop_readlink_t union_readlink;
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static vop_getwritemount_t union_getwritemount;
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static vop_reclaim_t union_reclaim;
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static vop_remove_t union_remove;
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static vop_rename_t union_rename;
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static vop_rmdir_t union_rmdir;
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static vop_poll_t union_poll;
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static vop_setacl_t union_setacl;
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static vop_setattr_t union_setattr;
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static vop_setlabel_t union_setlabel;
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static vop_setextattr_t union_setextattr;
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static vop_strategy_t union_strategy;
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static vop_symlink_t union_symlink;
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static vop_whiteout_t union_whiteout;
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static vop_write_t union_write;
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static __inline
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struct vnode *
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union_lock_upper(struct union_node *un, struct thread *td)
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{
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struct vnode *uppervp;
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if ((uppervp = un->un_uppervp) != NULL) {
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VREF(uppervp);
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vn_lock(uppervp, LK_EXCLUSIVE | LK_CANRECURSE | LK_RETRY, td);
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}
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KASSERT((uppervp == NULL || vrefcnt(uppervp) > 0), ("uppervp usecount is 0"));
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return(uppervp);
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}
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static __inline
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void
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union_unlock_upper(struct vnode *uppervp, struct thread *td)
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{
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vput(uppervp);
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}
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static __inline
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struct vnode *
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union_lock_other(struct union_node *un, struct thread *td)
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{
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struct vnode *vp;
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if (un->un_uppervp != NULL) {
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vp = union_lock_upper(un, td);
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} else if ((vp = un->un_lowervp) != NULL) {
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_CANRECURSE | LK_RETRY, td);
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}
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return(vp);
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}
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static __inline
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void
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union_unlock_other(struct vnode *vp, struct thread *td)
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{
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vput(vp);
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}
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/*
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* union_lookup:
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*
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* udvp must be exclusively locked on call and will remain
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* exclusively locked on return. This is the mount point
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* for our filesystem.
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*
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* dvp Our base directory, locked and referenced.
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* The passed dvp will be dereferenced and unlocked on return
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* and a new dvp will be returned which is locked and
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* referenced in the same variable.
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*
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* vpp is filled in with the result if no error occured,
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* locked and ref'd.
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*
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* If an error is returned, *vpp is set to NULLVP. If no
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* error occurs, *vpp is returned with a reference and an
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* exclusive lock.
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*/
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static int
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union_lookup1(udvp, pdvp, vpp, cnp)
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struct vnode *udvp;
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struct vnode **pdvp;
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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 thread *td = cnp->cn_thread;
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struct vnode *dvp = *pdvp;
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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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while ((dvp != udvp) && (dvp->v_vflag & VV_ROOT)) {
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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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tdvp = dvp;
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dvp = dvp->v_mount->mnt_vnodecovered;
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VREF(dvp);
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vput(tdvp);
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vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
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}
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}
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/*
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* Set return dvp to be the upperdvp 'parent directory.
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*/
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*pdvp = dvp;
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/*
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* If the VOP_LOOKUP() call generates an error, tdvp is invalid and
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* no changes will have been made to dvp, so we are set to return.
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*/
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error = VOP_LOOKUP(dvp, &tdvp, cnp);
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if (error) {
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UDEBUG(("dvp %p error %d flags %lx\n", dvp, error, cnp->cn_flags));
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*vpp = NULL;
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return (error);
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}
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/*
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* The parent directory will have been unlocked, unless this is a
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* dotdot lookup or if dvp == tdvp (tdvp must be locked).
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*
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* We want our dvp to remain locked and ref'd. We also want tdvp
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* to remain locked and ref'd.
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*/
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UDEBUG(("parentdir %p result %p flag %lx\n", dvp, tdvp, cnp->cn_flags));
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if (dvp != tdvp && (cnp->cn_flags & ISDOTDOT))
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vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
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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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* We use dvp as a temporary variable here, it is no longer related
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* to the dvp above. However, we have to ensure that both *pdvp and
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* tdvp are locked on return.
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*/
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dvp = tdvp;
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while (
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dvp != udvp &&
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(dvp->v_type == VDIR) &&
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(mp = dvp->v_mountedhere)
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) {
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int relock_pdvp = 0;
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if (vfs_busy(mp, 0, 0, td))
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continue;
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if (dvp == *pdvp)
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relock_pdvp = 1;
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vput(dvp);
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dvp = NULL;
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error = VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td);
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vfs_unbusy(mp, td);
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if (relock_pdvp)
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vn_lock(*pdvp, LK_EXCLUSIVE | LK_RETRY, td);
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if (error) {
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*vpp = NULL;
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return (error);
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}
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}
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*vpp = dvp;
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return (0);
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}
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static 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; /* starting dir */
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struct union_node *dun = VTOUNION(dvp); /* associated union node */
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struct componentname *cnp = ap->a_cnp;
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struct thread *td = cnp->cn_thread;
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struct union_mount *um = MOUNTTOUNIONMOUNT(dvp->v_mount);
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struct ucred *saved_cred = NULL;
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int iswhiteout;
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struct vattr va;
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*ap->a_vpp = NULLVP;
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/*
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* Disallow write attempts to the filesystem mounted read-only.
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*/
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if ((cnp->cn_flags & ISLASTCN) &&
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(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
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(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) {
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return (EROFS);
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}
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/*
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* For any lookups we do, always return with the parent locked.
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*/
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cnp->cn_flags |= LOCKPARENT;
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lowerdvp = dun->un_lowervp;
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uppervp = NULLVP;
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lowervp = NULLVP;
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iswhiteout = 0;
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uerror = ENOENT;
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lerror = ENOENT;
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/*
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* Get a private lock on uppervp and a reference, effectively
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* taking it out of the union_node's control.
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*
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* We must lock upperdvp while holding our lock on dvp
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* to avoid a deadlock.
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*/
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upperdvp = union_lock_upper(dun, td);
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/*
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* Do the lookup in the upper level.
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* If that level consumes 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 != NULLVP) {
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/*
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* We do not have to worry about the DOTDOT case, we've
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* already unlocked dvp.
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*/
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UDEBUG(("A %p\n", upperdvp));
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/*
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* Do the lookup. We must supply a locked and referenced
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* upperdvp to the function and will get a new locked and
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* referenced upperdvp back, with the old having been
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* dereferenced.
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*
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* If an error is returned, uppervp will be NULLVP. If no
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* error occurs, uppervp will be the locked and referenced.
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* Return vnode, or possibly NULL, depending on what is being
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* requested. It is possible that the returned uppervp
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* will be the same as upperdvp.
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*/
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uerror = union_lookup1(um->um_uppervp, &upperdvp, &uppervp, cnp);
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UDEBUG((
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"uerror %d upperdvp %p %d/%d, uppervp %p ref=%d/lck=%d\n",
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uerror,
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upperdvp,
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vrefcnt(upperdvp),
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VOP_ISLOCKED(upperdvp, NULL),
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uppervp,
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(uppervp ? vrefcnt(uppervp) : -99),
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(uppervp ? VOP_ISLOCKED(uppervp, NULL) : -99)
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));
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/*
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* Disallow write attempts to the filesystem mounted read-only.
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*/
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if (uerror == EJUSTRETURN && (cnp->cn_flags & ISLASTCN) &&
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(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
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(cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME)) {
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error = EROFS;
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goto out;
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}
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/*
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* Special case: If cn_consume != 0 then skip out. The result
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* of the lookup is transfered to our return variable. If
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* an error occured we have to throw away the results.
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*/
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if (cnp->cn_consume != 0) {
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if ((error = uerror) == 0) {
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*ap->a_vpp = uppervp;
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uppervp = NULL;
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}
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goto out;
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}
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/*
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* Calculate whiteout, fall through.
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*/
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if (uerror == ENOENT || uerror == EJUSTRETURN) {
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if (cnp->cn_flags & ISWHITEOUT) {
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iswhiteout = 1;
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} else if (lowerdvp != NULLVP) {
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int terror;
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terror = VOP_GETATTR(upperdvp, &va,
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cnp->cn_cred, cnp->cn_thread);
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if (terror == 0 && (va.va_flags & OPAQUE))
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iswhiteout = 1;
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}
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}
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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 != NULLVP && !iswhiteout) {
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int nameiop;
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UDEBUG(("B %p\n", lowerdvp));
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/*
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* Force only LOOKUPs on the lower 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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/*
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* We shouldn't have to worry about locking interactions
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* between the lower layer and our union layer (w.r.t.
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* `..' processing) because we don't futz with lowervp
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* locks in the union-node instantiation code path.
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*
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* union_lookup1() requires lowervp to be locked on entry,
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* and it will be unlocked on return. The ref count will
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* not change. On return lowervp doesn't represent anything
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* to us so we NULL it out.
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*/
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VREF(lowerdvp);
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vn_lock(lowerdvp, LK_EXCLUSIVE | LK_RETRY, td);
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lerror = union_lookup1(um->um_lowervp, &lowerdvp, &lowervp, cnp);
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if (lowerdvp == lowervp)
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vrele(lowerdvp);
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else
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vput(lowerdvp);
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lowerdvp = NULL; /* lowerdvp invalid after vput */
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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 (cnp->cn_consume != 0 || lerror == EACCES) {
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if ((error = lerror) == 0) {
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*ap->a_vpp = lowervp;
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lowervp = NULL;
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}
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goto out;
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}
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} else {
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UDEBUG(("C %p\n", lowerdvp));
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if ((cnp->cn_flags & ISDOTDOT) && dun->un_pvp != NULLVP) {
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if ((lowervp = LOWERVP(dun->un_pvp)) != NULL) {
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VREF(lowervp);
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vn_lock(lowervp, LK_EXCLUSIVE | LK_RETRY, td);
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lerror = 0;
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}
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}
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}
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/*
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* Ok. Now we have uerror, uppervp, upperdvp, lerror, and lowervp.
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*
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* 1. If both layers returned an error, select the upper layer.
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*
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* 2. If the upper layer failed and the bottom layer succeeded,
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* two subcases occur:
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*
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* a. The bottom vnode is not a directory, in which case
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* just return a new union vnode referencing an
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* empty top layer and the existing bottom layer.
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*
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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 layer and
|
|
* and fall through to case 3.
|
|
*
|
|
* 3. If the top layer succeeded, then return a new union
|
|
* vnode referencing whatever the new top layer and
|
|
* whatever the bottom layer returned.
|
|
*/
|
|
|
|
/* case 1. */
|
|
if ((uerror != 0) && (lerror != 0)) {
|
|
error = uerror;
|
|
goto out;
|
|
}
|
|
|
|
/* case 2. */
|
|
if (uerror != 0 /* && (lerror == 0) */ ) {
|
|
if (lowervp->v_type == VDIR) { /* case 2b. */
|
|
KASSERT(uppervp == NULL, ("uppervp unexpectedly non-NULL"));
|
|
/*
|
|
* Oops, uppervp has a problem, we may have to shadow.
|
|
*/
|
|
uerror = union_mkshadow(um, upperdvp, cnp, &uppervp);
|
|
if (uerror) {
|
|
error = uerror;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Must call union_allocvp() with both the upper and lower vnodes
|
|
* referenced and the upper vnode locked. ap->a_vpp is returned
|
|
* referenced and locked. lowervp, uppervp, and upperdvp are
|
|
* absorbed by union_allocvp() whether it succeeds or fails.
|
|
*
|
|
* upperdvp is the parent directory of uppervp which may be
|
|
* different, depending on the path, from dvp->un_uppervp. That's
|
|
* why it is a separate argument. Note that it must be unlocked.
|
|
*
|
|
* dvp must be locked on entry to the call and will be locked on
|
|
* return.
|
|
*/
|
|
|
|
if (uppervp && uppervp != upperdvp)
|
|
VOP_UNLOCK(uppervp, 0, td);
|
|
if (lowervp)
|
|
VOP_UNLOCK(lowervp, 0, td);
|
|
if (upperdvp)
|
|
VOP_UNLOCK(upperdvp, 0, td);
|
|
|
|
error = union_allocvp(ap->a_vpp, dvp->v_mount, dvp, upperdvp, cnp,
|
|
uppervp, lowervp, 1);
|
|
|
|
UDEBUG(("Create %p = %p %p refs=%d\n", *ap->a_vpp, uppervp, lowervp, (*ap->a_vpp) ? vrefcnt(*ap->a_vpp) : -99));
|
|
|
|
uppervp = NULL;
|
|
upperdvp = NULL;
|
|
lowervp = NULL;
|
|
|
|
/*
|
|
* Termination Code
|
|
*
|
|
* - put away any extra junk laying around. Note that lowervp
|
|
* (if not NULL) will never be the same as *ap->a_vp and
|
|
* neither will uppervp, because when we set that state we
|
|
* NULL-out lowervp or uppervp. On the otherhand, upperdvp
|
|
* may match uppervp or *ap->a_vpp.
|
|
*
|
|
* - relock/unlock dvp if appropriate.
|
|
*/
|
|
|
|
out:
|
|
if (upperdvp) {
|
|
if (upperdvp == uppervp || upperdvp == *ap->a_vpp)
|
|
vrele(upperdvp);
|
|
else
|
|
vput(upperdvp);
|
|
}
|
|
|
|
if (uppervp)
|
|
vput(uppervp);
|
|
|
|
if (lowervp)
|
|
vput(lowervp);
|
|
|
|
UDEBUG(("Out %d vpp %p/%d lower %p upper %p\n", error, *ap->a_vpp,
|
|
((*ap->a_vpp) ? vrefcnt(*ap->a_vpp) : -99),
|
|
lowervp, uppervp));
|
|
|
|
if (error == 0 || error == EJUSTRETURN) {
|
|
if (cnp->cn_namelen == 1 &&
|
|
cnp->cn_nameptr[0] == '.' &&
|
|
*ap->a_vpp != dvp) {
|
|
#ifdef DIAGNOSTIC
|
|
vprint("union_lookup: vp", *ap->a_vpp);
|
|
vprint("union_lookup: dvp", dvp);
|
|
#endif
|
|
panic("union_lookup returning . (%p) != startdir (%p)",
|
|
*ap->a_vpp, dvp);
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_create:
|
|
*
|
|
* a_dvp is locked on entry and remains locked on return. a_vpp is returned
|
|
* locked if no error occurs, otherwise it is garbage.
|
|
*/
|
|
|
|
static int
|
|
union_create(ap)
|
|
struct vop_create_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct vnode *dvp;
|
|
int error = EROFS;
|
|
|
|
if ((dvp = union_lock_upper(dun, td)) != NULL) {
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
|
|
error = VOP_CREATE(dvp, &vp, cnp, ap->a_vap);
|
|
if (error == 0) {
|
|
mp = ap->a_dvp->v_mount;
|
|
VOP_UNLOCK(vp, 0, td);
|
|
UDEBUG(("ALLOCVP-1 FROM %p REFS %d\n", vp, vrefcnt(vp)));
|
|
error = union_allocvp(ap->a_vpp, mp, NULLVP, NULLVP,
|
|
cnp, vp, NULLVP, 1);
|
|
UDEBUG(("ALLOCVP-2B FROM %p REFS %d\n", *ap->a_vpp, vrefcnt(vp)));
|
|
}
|
|
union_unlock_upper(dvp, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_whiteout(ap)
|
|
struct vop_whiteout_args /* {
|
|
struct vnode *a_dvp;
|
|
struct componentname *a_cnp;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_dvp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct vnode *uppervp;
|
|
int error;
|
|
|
|
switch (ap->a_flags) {
|
|
case CREATE:
|
|
case DELETE:
|
|
uppervp = union_lock_upper(un, cnp->cn_thread);
|
|
if (uppervp != NULLVP) {
|
|
error = VOP_WHITEOUT(un->un_uppervp, cnp, ap->a_flags);
|
|
union_unlock_upper(uppervp, cnp->cn_thread);
|
|
} else
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
case LOOKUP:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
default:
|
|
panic("union_whiteout: unknown op");
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_mknod:
|
|
*
|
|
* a_dvp is locked on entry and should remain locked on return.
|
|
* a_vpp is garbagre whether an error occurs or not.
|
|
*/
|
|
|
|
static int
|
|
union_mknod(ap)
|
|
struct vop_mknod_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct vnode *dvp;
|
|
int error = EROFS;
|
|
|
|
if ((dvp = union_lock_upper(dun, cnp->cn_thread)) != NULL) {
|
|
error = VOP_MKNOD(dvp, ap->a_vpp, cnp, ap->a_vap);
|
|
union_unlock_upper(dvp, cnp->cn_thread);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_open:
|
|
*
|
|
* run open VOP. When opening the underlying vnode we have to mimic
|
|
* vn_open(). What we *really* need to do to avoid screwups if the
|
|
* open semantics change is to call vn_open(). For example, ufs blows
|
|
* up if you open a file but do not vmio it prior to writing.
|
|
*/
|
|
|
|
static 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 thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *tvp;
|
|
int mode = ap->a_mode;
|
|
struct ucred *cred = ap->a_cred;
|
|
struct thread *td = ap->a_td;
|
|
int error = 0;
|
|
int tvpisupper = 1;
|
|
|
|
/*
|
|
* If there is an existing upper vp then simply open that.
|
|
* The upper vp takes precedence over the lower vp. When opening
|
|
* a lower vp for writing copy it to the uppervp and then open the
|
|
* uppervp.
|
|
*
|
|
* At the end of this section tvp will be left locked.
|
|
*/
|
|
if ((tvp = union_lock_upper(un, td)) == 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)) {
|
|
int docopy = !(mode & O_TRUNC);
|
|
error = union_copyup(un, docopy, cred, td);
|
|
tvp = union_lock_upper(un, td);
|
|
} else {
|
|
un->un_openl++;
|
|
VREF(tvp);
|
|
vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
tvpisupper = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We are holding the correct vnode, open it.
|
|
*/
|
|
|
|
if (error == 0)
|
|
error = VOP_OPEN(tvp, mode, cred, td, -1);
|
|
|
|
/*
|
|
* Release any locks held.
|
|
*/
|
|
if (tvpisupper) {
|
|
if (tvp)
|
|
union_unlock_upper(tvp, td);
|
|
} else {
|
|
vput(tvp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_close:
|
|
*
|
|
* It is unclear whether a_vp is passed locked or unlocked. Whatever
|
|
* the case we do not change it.
|
|
*/
|
|
|
|
static int
|
|
union_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
if ((vp = un->un_uppervp) == NULLVP) {
|
|
#ifdef UNION_DIAGNOSTIC
|
|
if (un->un_openl <= 0)
|
|
panic("union: un_openl cnt");
|
|
#endif
|
|
--un->un_openl;
|
|
vp = un->un_lowervp;
|
|
}
|
|
ap->a_vp = vp;
|
|
return (VOP_CLOSE_AP(ap));
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static 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 thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct thread *td = ap->a_td;
|
|
int error = EACCES;
|
|
struct vnode *vp;
|
|
|
|
/*
|
|
* Disallow write attempts on filesystems mounted read-only.
|
|
*/
|
|
if ((ap->a_mode & VWRITE) &&
|
|
(ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)) {
|
|
switch (ap->a_vp->v_type) {
|
|
case VREG:
|
|
case VDIR:
|
|
case VLNK:
|
|
return (EROFS);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((vp = union_lock_upper(un, td)) != NULLVP) {
|
|
ap->a_vp = vp;
|
|
error = VOP_ACCESS_AP(ap);
|
|
union_unlock_upper(vp, td);
|
|
return(error);
|
|
}
|
|
|
|
if ((vp = un->un_lowervp) != NULLVP) {
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
ap->a_vp = vp;
|
|
|
|
/*
|
|
* Remove VWRITE from a_mode if our mount point is RW, because
|
|
* we want to allow writes and lowervp may be read-only.
|
|
*/
|
|
if ((un->un_vnode->v_mount->mnt_flag & MNT_RDONLY) == 0)
|
|
ap->a_mode &= ~VWRITE;
|
|
|
|
error = VOP_ACCESS_AP(ap);
|
|
if (error == 0) {
|
|
struct union_mount *um;
|
|
|
|
um = MOUNTTOUNIONMOUNT(un->un_vnode->v_mount);
|
|
|
|
if (um->um_op == UNMNT_BELOW) {
|
|
ap->a_cred = um->um_cred;
|
|
error = VOP_ACCESS_AP(ap);
|
|
}
|
|
}
|
|
VOP_UNLOCK(vp, 0, td);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* We handle getattr only to change the fsid and
|
|
* track object sizes
|
|
*
|
|
* It's not clear whether VOP_GETATTR is to be
|
|
* called with the vnode locked or not. stat() calls
|
|
* it with (vp) locked, and fstat() calls it with
|
|
* (vp) unlocked.
|
|
*
|
|
* Because of this we cannot use our normal locking functions
|
|
* if we do not intend to lock the main a_vp node. At the moment
|
|
* we are running without any specific locking at all, but beware
|
|
* to any programmer that care must be taken if locking is added
|
|
* to this function.
|
|
*/
|
|
|
|
static int
|
|
union_getattr(ap)
|
|
struct vop_getattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct union_mount *um = MOUNTTOUNIONMOUNT(ap->a_vp->v_mount);
|
|
struct vnode *vp;
|
|
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;
|
|
|
|
if ((vp = un->un_uppervp) != NULLVP) {
|
|
error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
/* XXX isn't this dangerous without a lock? */
|
|
union_newsize(ap->a_vp, vap->va_size, VNOVAL);
|
|
}
|
|
|
|
if (vp == NULLVP) {
|
|
vp = un->un_lowervp;
|
|
} else if (vp->v_type == VDIR && un->un_lowervp != NULLVP) {
|
|
vp = un->un_lowervp;
|
|
vap = &va;
|
|
} else {
|
|
vp = NULLVP;
|
|
}
|
|
|
|
if (vp != NULLVP) {
|
|
error = VOP_GETATTR(vp, vap, ap->a_cred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
/* XXX isn't this dangerous without a lock? */
|
|
union_newsize(ap->a_vp, VNOVAL, vap->va_size);
|
|
}
|
|
|
|
if (ap->a_vap->va_fsid == um->um_upperdev)
|
|
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
|
|
|
|
if ((vap != ap->a_vap) && (vap->va_type == VDIR))
|
|
ap->a_vap->va_nlink += vap->va_nlink;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
union_setattr(ap)
|
|
struct vop_setattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct thread *td = ap->a_td;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct vnode *uppervp;
|
|
int error;
|
|
|
|
/*
|
|
* Disallow write attempts on filesystems mounted read-only.
|
|
*/
|
|
if ((ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) &&
|
|
(vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
|
|
vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
|
|
vap->va_mtime.tv_sec != VNOVAL ||
|
|
vap->va_mode != (mode_t)VNOVAL)) {
|
|
return (EROFS);
|
|
}
|
|
|
|
/*
|
|
* 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 && (un->un_lowervp->v_type == VREG)) {
|
|
error = union_copyup(un, (ap->a_vap->va_size != 0),
|
|
ap->a_cred, ap->a_td);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Try to set attributes in upper layer,
|
|
* otherwise return read-only filesystem error.
|
|
*/
|
|
error = EROFS;
|
|
if ((uppervp = union_lock_upper(un, td)) != NULLVP) {
|
|
error = VOP_SETATTR(un->un_uppervp, ap->a_vap,
|
|
ap->a_cred, ap->a_td);
|
|
if ((error == 0) && (ap->a_vap->va_size != VNOVAL))
|
|
union_newsize(ap->a_vp, ap->a_vap->va_size, VNOVAL);
|
|
union_unlock_upper(uppervp, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_read(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct thread *td = ap->a_uio->uio_td;
|
|
struct vnode *uvp;
|
|
int error;
|
|
|
|
uvp = union_lock_other(un, td);
|
|
KASSERT(uvp != NULL, ("union_read: backing vnode missing!"));
|
|
|
|
error = VOP_READ(uvp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
union_unlock_other(uvp, td);
|
|
|
|
/*
|
|
* XXX
|
|
* Perhaps the size of the underlying object has changed under
|
|
* our feet. Take advantage of the offset information present
|
|
* in the uio structure.
|
|
*/
|
|
if (error == 0) {
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
off_t cur = ap->a_uio->uio_offset;
|
|
|
|
if (uvp == un->un_uppervp) {
|
|
if (cur > un->un_uppersz)
|
|
union_newsize(ap->a_vp, cur, VNOVAL);
|
|
} else {
|
|
if (cur > un->un_lowersz)
|
|
union_newsize(ap->a_vp, VNOVAL, cur);
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_write(ap)
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct thread *td = ap->a_uio->uio_td;
|
|
struct vnode *uppervp;
|
|
int error;
|
|
|
|
if ((uppervp = union_lock_upper(un, td)) == NULLVP)
|
|
panic("union: missing upper layer in write");
|
|
|
|
error = VOP_WRITE(uppervp, ap->a_uio, ap->a_ioflag, ap->a_cred);
|
|
|
|
/*
|
|
* The size of the underlying object may be changed by the
|
|
* write.
|
|
*/
|
|
if (error == 0) {
|
|
off_t cur = ap->a_uio->uio_offset;
|
|
|
|
if (cur > un->un_uppersz)
|
|
union_newsize(ap->a_vp, cur, VNOVAL);
|
|
}
|
|
union_unlock_upper(uppervp, td);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_lease(ap)
|
|
struct vop_lease_args /* {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
struct ucred *a_cred;
|
|
int a_flag;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *ovp = OTHERVP(ap->a_vp);
|
|
|
|
ap->a_vp = ovp;
|
|
return (VOP_LEASE_AP(ap));
|
|
}
|
|
|
|
static int
|
|
union_ioctl(ap)
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
u_long a_command;
|
|
caddr_t a_data;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *ovp = OTHERVP(ap->a_vp);
|
|
|
|
ap->a_vp = ovp;
|
|
return (VOP_IOCTL_AP(ap));
|
|
}
|
|
|
|
static int
|
|
union_poll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *ovp = OTHERVP(ap->a_vp);
|
|
|
|
ap->a_vp = ovp;
|
|
return (VOP_POLL_AP(ap));
|
|
}
|
|
|
|
static int
|
|
union_fsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error = 0;
|
|
struct thread *td = ap->a_td;
|
|
struct vnode *targetvp;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
|
|
if ((targetvp = union_lock_other(un, td)) != NULLVP) {
|
|
error = VOP_FSYNC(targetvp, ap->a_waitfor, td);
|
|
union_unlock_other(targetvp, td);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_remove:
|
|
*
|
|
* Remove the specified cnp. The dvp and vp are passed to us locked
|
|
* and must remain locked on return.
|
|
*/
|
|
|
|
static int
|
|
union_remove(ap)
|
|
struct vop_remove_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct vnode *uppervp;
|
|
struct vnode *upperdvp;
|
|
int error;
|
|
|
|
if ((upperdvp = union_lock_upper(dun, td)) == NULLVP)
|
|
panic("union remove: null upper vnode");
|
|
|
|
if ((uppervp = union_lock_upper(un, td)) != NULLVP) {
|
|
if (union_dowhiteout(un, cnp->cn_cred, td))
|
|
cnp->cn_flags |= DOWHITEOUT;
|
|
if (cnp->cn_flags & DOWHITEOUT) /* XXX fs corruption */
|
|
error = EOPNOTSUPP;
|
|
else
|
|
error = VOP_REMOVE(upperdvp, uppervp, cnp);
|
|
if (!error)
|
|
union_removed_upper(un);
|
|
union_unlock_upper(uppervp, td);
|
|
} else {
|
|
error = union_mkwhiteout(
|
|
MOUNTTOUNIONMOUNT(ap->a_dvp->v_mount),
|
|
upperdvp, ap->a_cnp, un->un_path);
|
|
}
|
|
union_unlock_upper(upperdvp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_link:
|
|
*
|
|
* tdvp and vp will be locked on entry.
|
|
* tdvp and vp should remain locked on return.
|
|
*/
|
|
|
|
static int
|
|
union_link(ap)
|
|
struct vop_link_args /* {
|
|
struct vnode *a_tdvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct union_node *dun = VTOUNION(ap->a_tdvp);
|
|
struct vnode *vp;
|
|
struct vnode *tdvp;
|
|
int error = 0;
|
|
|
|
if (ap->a_tdvp->v_op != ap->a_vp->v_op) {
|
|
vp = ap->a_vp;
|
|
} else {
|
|
struct union_node *tun = VTOUNION(ap->a_vp);
|
|
|
|
if (tun->un_uppervp == NULLVP) {
|
|
#if 0
|
|
if (dun->un_uppervp == tun->un_dirvp) {
|
|
if (dun->un_flags & UN_ULOCK) {
|
|
dun->un_flags &= ~UN_ULOCK;
|
|
VOP_UNLOCK(dun->un_uppervp, 0, td);
|
|
}
|
|
}
|
|
#endif
|
|
error = union_copyup(tun, 1, cnp->cn_cred, td);
|
|
#if 0
|
|
if (dun->un_uppervp == tun->un_dirvp) {
|
|
vn_lock(dun->un_uppervp,
|
|
LK_EXCLUSIVE | LK_RETRY, td);
|
|
dun->un_flags |= UN_ULOCK;
|
|
}
|
|
#endif
|
|
if (error)
|
|
return (error);
|
|
}
|
|
vp = tun->un_uppervp;
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
}
|
|
|
|
/*
|
|
* Make sure upper is locked, then unlock the union directory we were
|
|
* called with to avoid a deadlock while we are calling VOP_LINK() on
|
|
* the upper (with tdvp locked and vp not locked). Our ap->a_tdvp
|
|
* is expected to be locked on return.
|
|
*/
|
|
|
|
if ((tdvp = union_lock_upper(dun, td)) == NULLVP)
|
|
return (EROFS);
|
|
|
|
VOP_UNLOCK(ap->a_tdvp, 0, td); /* unlock calling node */
|
|
error = VOP_LINK(tdvp, vp, cnp); /* call link on upper */
|
|
|
|
/*
|
|
* Unlock tun->un_uppervp if we locked it above.
|
|
*/
|
|
if (ap->a_tdvp->v_op == ap->a_vp->v_op)
|
|
VOP_UNLOCK(vp, 0, td);
|
|
/*
|
|
* We have to unlock tdvp prior to relocking our calling node in
|
|
* order to avoid a deadlock. We also have to unlock ap->a_vp
|
|
* before relocking the directory, but then we have to relock
|
|
* ap->a_vp as our caller expects.
|
|
*/
|
|
VOP_UNLOCK(ap->a_vp, 0, td);
|
|
union_unlock_upper(tdvp, td);
|
|
vn_lock(ap->a_tdvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
return (error);
|
|
}
|
|
|
|
static 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;
|
|
|
|
/*
|
|
* Figure out what fdvp to pass to our upper or lower vnode. If we
|
|
* replace the fdvp, release the original one and ref the new one.
|
|
*/
|
|
|
|
if (fdvp->v_op == &union_vnodeops) { /* always true */
|
|
struct union_node *un = VTOUNION(fdvp);
|
|
if (un->un_uppervp == NULLVP) {
|
|
/*
|
|
* this should never happen in normal
|
|
* operation but might if there was
|
|
* a problem creating the top-level shadow
|
|
* directory.
|
|
*/
|
|
error = EXDEV;
|
|
goto bad;
|
|
}
|
|
fdvp = un->un_uppervp;
|
|
VREF(fdvp);
|
|
vrele(ap->a_fdvp);
|
|
}
|
|
|
|
/*
|
|
* Figure out what fvp to pass to our upper or lower vnode. If we
|
|
* replace the fvp, release the original one and ref the new one.
|
|
*/
|
|
|
|
if (fvp->v_op == &union_vnodeops) { /* always true */
|
|
struct union_node *un = VTOUNION(fvp);
|
|
#if 0
|
|
struct union_mount *um = MOUNTTOUNIONMOUNT(fvp->v_mount);
|
|
#endif
|
|
|
|
if (un->un_uppervp == NULLVP) {
|
|
switch(fvp->v_type) {
|
|
case VREG:
|
|
vn_lock(un->un_vnode, LK_EXCLUSIVE | LK_RETRY, ap->a_fcnp->cn_thread);
|
|
error = union_copyup(un, 1, ap->a_fcnp->cn_cred, ap->a_fcnp->cn_thread);
|
|
VOP_UNLOCK(un->un_vnode, 0, ap->a_fcnp->cn_thread);
|
|
if (error)
|
|
goto bad;
|
|
break;
|
|
case VDIR:
|
|
/*
|
|
* XXX not yet.
|
|
*
|
|
* There is only one way to rename a directory
|
|
* based in the lowervp, and that is to copy
|
|
* the entire directory hierarchy. Otherwise
|
|
* it would not last across a reboot.
|
|
*/
|
|
#if 0
|
|
vrele(fvp);
|
|
fvp = NULL;
|
|
vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY, ap->a_fcnp->cn_thread);
|
|
error = union_mkshadow(um, fdvp,
|
|
ap->a_fcnp, &un->un_uppervp);
|
|
VOP_UNLOCK(fdvp, 0, ap->a_fcnp->cn_thread);
|
|
if (un->un_uppervp)
|
|
VOP_UNLOCK(un->un_uppervp, 0, ap->a_fcnp->cn_thread);
|
|
if (error)
|
|
goto bad;
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EXDEV;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
if (un->un_lowervp != NULLVP)
|
|
ap->a_fcnp->cn_flags |= DOWHITEOUT;
|
|
fvp = un->un_uppervp;
|
|
VREF(fvp);
|
|
vrele(ap->a_fvp);
|
|
}
|
|
|
|
/*
|
|
* Figure out what tdvp (destination directory) to pass to the
|
|
* lower level. If we replace it with uppervp, we need to vput the
|
|
* old one. The exclusive lock is transfered to what we will pass
|
|
* down in the VOP_RENAME() and we replace uppervp with a simple
|
|
* reference.
|
|
*/
|
|
|
|
if (tdvp->v_op == &union_vnodeops) {
|
|
struct union_node *un = VTOUNION(tdvp);
|
|
|
|
if (un->un_uppervp == NULLVP) {
|
|
/*
|
|
* This should never happen in normal
|
|
* operation but might if there was
|
|
* a problem creating the top-level shadow
|
|
* directory.
|
|
*/
|
|
error = EXDEV;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* New tdvp is a lock and reference on uppervp.
|
|
* Put away the old tdvp.
|
|
*/
|
|
tdvp = union_lock_upper(un, ap->a_tcnp->cn_thread);
|
|
vput(ap->a_tdvp);
|
|
}
|
|
|
|
/*
|
|
* Figure out what tvp (destination file) to pass to the
|
|
* lower level.
|
|
*
|
|
* If the uppervp file does not exist, put away the (wrong)
|
|
* file and change tvp to NULL.
|
|
*/
|
|
|
|
if (tvp != NULLVP && tvp->v_op == &union_vnodeops) {
|
|
struct union_node *un = VTOUNION(tvp);
|
|
|
|
tvp = union_lock_upper(un, ap->a_tcnp->cn_thread);
|
|
vput(ap->a_tvp);
|
|
/* note: tvp may be NULL */
|
|
}
|
|
|
|
/*
|
|
* VOP_RENAME() releases/vputs prior to returning, so we have no
|
|
* cleanup to do.
|
|
*/
|
|
|
|
return (VOP_RENAME(fdvp, fvp, ap->a_fcnp, tdvp, tvp, ap->a_tcnp));
|
|
|
|
/*
|
|
* Error. We still have to release / vput the various elements.
|
|
*/
|
|
|
|
bad:
|
|
vrele(fdvp);
|
|
if (fvp)
|
|
vrele(fvp);
|
|
vput(tdvp);
|
|
if (tvp != NULLVP) {
|
|
if (tvp != tdvp)
|
|
vput(tvp);
|
|
else
|
|
vrele(tvp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static 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 *dun = VTOUNION(ap->a_dvp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct vnode *upperdvp;
|
|
int error = EROFS;
|
|
|
|
if ((upperdvp = union_lock_upper(dun, td)) != NULLVP) {
|
|
struct vnode *vp;
|
|
|
|
error = VOP_MKDIR(upperdvp, &vp, cnp, ap->a_vap);
|
|
union_unlock_upper(upperdvp, td);
|
|
|
|
if (error == 0) {
|
|
VOP_UNLOCK(vp, 0, td);
|
|
UDEBUG(("ALLOCVP-2 FROM %p REFS %d\n", vp, vrefcnt(vp)));
|
|
error = union_allocvp(ap->a_vpp, ap->a_dvp->v_mount,
|
|
ap->a_dvp, NULLVP, cnp, vp, NULLVP, 1);
|
|
UDEBUG(("ALLOCVP-2B FROM %p REFS %d\n", *ap->a_vpp, vrefcnt(vp)));
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_rmdir(ap)
|
|
struct vop_rmdir_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *dun = VTOUNION(ap->a_dvp);
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct vnode *upperdvp;
|
|
struct vnode *uppervp;
|
|
int error;
|
|
|
|
if ((upperdvp = union_lock_upper(dun, td)) == NULLVP)
|
|
panic("union rmdir: null upper vnode");
|
|
|
|
if ((uppervp = union_lock_upper(un, td)) != NULLVP) {
|
|
if (union_dowhiteout(un, cnp->cn_cred, td))
|
|
cnp->cn_flags |= DOWHITEOUT;
|
|
if (cnp->cn_flags & DOWHITEOUT) /* XXX fs corruption */
|
|
error = EOPNOTSUPP;
|
|
else
|
|
error = VOP_RMDIR(upperdvp, uppervp, ap->a_cnp);
|
|
if (!error)
|
|
union_removed_upper(un);
|
|
union_unlock_upper(uppervp, td);
|
|
} else {
|
|
error = union_mkwhiteout(
|
|
MOUNTTOUNIONMOUNT(ap->a_dvp->v_mount),
|
|
dun->un_uppervp, ap->a_cnp, un->un_path);
|
|
}
|
|
union_unlock_upper(upperdvp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* union_symlink:
|
|
*
|
|
* dvp is locked on entry and remains locked on return. a_vpp is garbage
|
|
* (unused).
|
|
*/
|
|
|
|
static 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 *dun = VTOUNION(ap->a_dvp);
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct vnode *dvp;
|
|
int error = EROFS;
|
|
|
|
if ((dvp = union_lock_upper(dun, td)) != NULLVP) {
|
|
error = VOP_SYMLINK(dvp, ap->a_vpp, cnp, ap->a_vap,
|
|
ap->a_target);
|
|
union_unlock_upper(dvp, td);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
union_readdir(ap)
|
|
struct vop_readdir_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
u_long *a_cookies;
|
|
int a_ncookies;
|
|
} */ *ap;
|
|
{
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct thread *td = ap->a_uio->uio_td;
|
|
struct vnode *uvp;
|
|
int error = 0;
|
|
|
|
if ((uvp = union_lock_upper(un, td)) != NULLVP) {
|
|
ap->a_vp = uvp;
|
|
error = VOP_READDIR_AP(ap);
|
|
union_unlock_upper(uvp, td);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
static int
|
|
union_readlink(ap)
|
|
struct vop_readlink_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct uio *uio = ap->a_uio;
|
|
struct thread *td = uio->uio_td;
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, td);
|
|
KASSERT(vp != NULL, ("union_readlink: backing vnode missing!"));
|
|
|
|
ap->a_vp = vp;
|
|
error = VOP_READLINK_AP(ap);
|
|
union_unlock_other(vp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_getwritemount(ap)
|
|
struct vop_getwritemount_args /* {
|
|
struct vnode *a_vp;
|
|
struct mount **a_mpp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *uvp = UPPERVP(vp);
|
|
|
|
if (uvp == NULL) {
|
|
VI_LOCK(vp);
|
|
if (vp->v_iflag & VI_FREE) {
|
|
VI_UNLOCK(vp);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
VI_UNLOCK(vp);
|
|
return (EACCES);
|
|
}
|
|
return(VOP_GETWRITEMOUNT(uvp, ap->a_mpp));
|
|
}
|
|
|
|
/*
|
|
* union_inactive:
|
|
*
|
|
* Called with the vnode locked. We are expected to unlock the vnode.
|
|
*/
|
|
|
|
static int
|
|
union_inactive(ap)
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct union_node *un = VTOUNION(vp);
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
if (un->un_dircache != NULL)
|
|
union_dircache_free(un);
|
|
|
|
#if 0
|
|
if ((un->un_flags & UN_ULOCK) && un->un_uppervp) {
|
|
un->un_flags &= ~UN_ULOCK;
|
|
VOP_UNLOCK(un->un_uppervp, 0, td);
|
|
}
|
|
#endif
|
|
|
|
if ((un->un_flags & UN_CACHED) == 0)
|
|
vgone(vp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
union_reclaim(ap)
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
union_freevp(ap->a_vp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
union_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
printf("\tvp=%p, uppervp=%p, lowervp=%p\n",
|
|
vp, UPPERVP(vp), LOWERVP(vp));
|
|
if (UPPERVP(vp) != NULLVP)
|
|
vprint("union: upper", UPPERVP(vp));
|
|
if (LOWERVP(vp) != NULLVP)
|
|
vprint("union: lower", LOWERVP(vp));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
union_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct thread *td = curthread; /* XXX */
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, td);
|
|
KASSERT(vp != NULL, ("union_pathconf: backing vnode missing!"));
|
|
|
|
ap->a_vp = vp;
|
|
error = VOP_PATHCONF_AP(ap);
|
|
union_unlock_other(vp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static 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;
|
|
{
|
|
register struct vnode *ovp = OTHERVP(ap->a_vp);
|
|
|
|
ap->a_vp = ovp;
|
|
return (VOP_ADVLOCK_AP(ap));
|
|
}
|
|
|
|
|
|
/*
|
|
* XXX - vop_strategy must be hand coded because it has no
|
|
* YYY - and it is not coherent with anything
|
|
*
|
|
* vnode in its arguments.
|
|
* This goes away with a merged VM/buffer cache.
|
|
*/
|
|
static int
|
|
union_strategy(ap)
|
|
struct vop_strategy_args /* {
|
|
struct vnode *a_vp;
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
struct buf *bp = ap->a_bp;
|
|
struct vnode *othervp = OTHERVP(ap->a_vp);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (othervp == NULLVP)
|
|
panic("union_strategy: nil vp");
|
|
if ((bp->b_iocmd == BIO_WRITE) &&
|
|
(othervp == LOWERVP(ap->a_vp)))
|
|
panic("union_strategy: writing to lowervp");
|
|
#endif
|
|
return (VOP_STRATEGY(othervp, bp));
|
|
}
|
|
|
|
static int
|
|
union_getacl(ap)
|
|
struct vop_getacl_args /* {
|
|
struct vnode *a_vp;
|
|
acl_type_t a_type;
|
|
struct acl *a_aclp;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_GETACL_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_setacl(ap)
|
|
struct vop_setacl_args /* {
|
|
struct vnode *a_vp;
|
|
acl_type_t a_type;
|
|
struct acl *a_aclp;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_SETACL_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_aclcheck(ap)
|
|
struct vop_aclcheck_args /* {
|
|
struct vnode *a_vp;
|
|
acl_type_t a_type;
|
|
struct acl *a_aclp;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *ovp = OTHERVP(ap->a_vp);
|
|
|
|
ap->a_vp = ovp;
|
|
return (VOP_ACLCHECK_AP(ap));
|
|
}
|
|
|
|
static int
|
|
union_closeextattr(ap)
|
|
struct vop_closeextattr_args /* {
|
|
struct vnode *a_vp;
|
|
int a_commit;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_CLOSEEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_getextattr(ap)
|
|
struct vop_getextattr_args /* {
|
|
struct vnode *a_vp;
|
|
int a_attrnamespace;
|
|
const char *a_name;
|
|
struct uio *a_uio;
|
|
size_t *a_size;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_GETEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_listextattr(ap)
|
|
struct vop_listextattr_args /* {
|
|
struct vnode *a_vp;
|
|
int a_attrnamespace;
|
|
struct uio *a_uio;
|
|
size_t *a_size;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_LISTEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_openextattr(ap)
|
|
struct vop_openextattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_OPENEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_deleteextattr(ap)
|
|
struct vop_deleteextattr_args /* {
|
|
struct vnode *a_vp;
|
|
int a_attrnamespace;
|
|
const char *a_name;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_DELETEEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_setextattr(ap)
|
|
struct vop_setextattr_args /* {
|
|
struct vnode *a_vp;
|
|
int a_attrnamespace;
|
|
const char *a_name;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_SETEXTATTR_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
union_setlabel(ap)
|
|
struct vop_setlabel_args /* {
|
|
struct vnode *a_vp;
|
|
struct label *a_label;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct union_node *un = VTOUNION(ap->a_vp);
|
|
struct vnode *vp;
|
|
|
|
vp = union_lock_other(un, ap->a_td);
|
|
ap->a_vp = vp;
|
|
error = VOP_SETLABEL_AP(ap);
|
|
union_unlock_other(vp, ap->a_td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Global vfs data structures
|
|
*/
|
|
struct vop_vector union_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
|
|
.vop_access = union_access,
|
|
.vop_aclcheck = union_aclcheck,
|
|
.vop_advlock = union_advlock,
|
|
.vop_bmap = VOP_EOPNOTSUPP,
|
|
.vop_close = union_close,
|
|
.vop_closeextattr = union_closeextattr,
|
|
.vop_create = union_create,
|
|
.vop_deleteextattr = union_deleteextattr,
|
|
.vop_fsync = union_fsync,
|
|
.vop_getacl = union_getacl,
|
|
.vop_getattr = union_getattr,
|
|
.vop_getextattr = union_getextattr,
|
|
.vop_getwritemount = union_getwritemount,
|
|
.vop_inactive = union_inactive,
|
|
.vop_ioctl = union_ioctl,
|
|
.vop_lease = union_lease,
|
|
.vop_link = union_link,
|
|
.vop_listextattr = union_listextattr,
|
|
.vop_lookup = union_lookup,
|
|
.vop_mkdir = union_mkdir,
|
|
.vop_mknod = union_mknod,
|
|
.vop_open = union_open,
|
|
.vop_openextattr = union_openextattr,
|
|
.vop_pathconf = union_pathconf,
|
|
.vop_poll = union_poll,
|
|
.vop_print = union_print,
|
|
.vop_read = union_read,
|
|
.vop_readdir = union_readdir,
|
|
.vop_readlink = union_readlink,
|
|
.vop_reclaim = union_reclaim,
|
|
.vop_remove = union_remove,
|
|
.vop_rename = union_rename,
|
|
.vop_rmdir = union_rmdir,
|
|
.vop_setacl = union_setacl,
|
|
.vop_setattr = union_setattr,
|
|
.vop_setextattr = union_setextattr,
|
|
.vop_setlabel = union_setlabel,
|
|
.vop_strategy = union_strategy,
|
|
.vop_symlink = union_symlink,
|
|
.vop_whiteout = union_whiteout,
|
|
.vop_write = union_write,
|
|
};
|