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freebsd-dev/sys/fs/unionfs/union_vnops.c
Jason A. Harmening 06f79675b7 unionfs: fix potential deadlock in VOP_RMDIR 
VOP_RMDIR() is called with both parent and child directory vnodes
locked.  The relookup operation performed by the unionfs implementation
may relock both vnodes.  Accordingly, unionfs_relookup() drops the
parent vnode lock, but the child vnode lock is never dropped.
Although relookup() will very likely try to relock the child vnode
which is already locked, in most cases this doesn't produce a deadlock
because unionfs_lock() forces LK_CANRECURSE (!).  However, relocking
of the parent vnode while the child vnode remains locked effectively
reverses the expected parent->child lock order, which can produce
a deadlock e.g. in the presence of a concurrent unionfs_lookup()
operation.  Address the issue by dropping the child lock around
the unionfs_relookup() call in unionfs_rmdir().

Reported by:	pho
Reviewed by:	kib, markj
Differential Revision: https://reviews.freebsd.org/D32986
2021-11-14 20:07:42 -08:00

2596 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1992, 1993, 1994, 1995 Jan-Simon Pendry.
* Copyright (c) 1992, 1993, 1994, 1995
* The Regents of the University of California.
* Copyright (c) 2005, 2006, 2012 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
* Copyright (c) 2006, 2012 Daichi Goto <daichi@freebsd.org>
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)union_vnops.c 8.32 (Berkeley) 6/23/95
* $FreeBSD$
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/kdb.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/dirent.h>
#include <sys/proc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <fs/unionfs/union.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vnode_pager.h>
#if 0
#define UNIONFS_INTERNAL_DEBUG(msg, args...) printf(msg, ## args)
#define UNIONFS_IDBG_RENAME
#else
#define UNIONFS_INTERNAL_DEBUG(msg, args...)
#endif
#define KASSERT_UNIONFS_VNODE(vp) \
KASSERT(((vp)->v_op == &unionfs_vnodeops), \
("unionfs: it is not unionfs-vnode"))
static int
unionfs_lookup(struct vop_cachedlookup_args *ap)
{
struct unionfs_node *dunp;
struct vnode *dvp, *udvp, *ldvp, *vp, *uvp, *lvp, *dtmpvp;
struct vattr va;
struct componentname *cnp;
struct thread *td;
u_long nameiop;
u_long cnflags, cnflagsbk;
int iswhiteout;
int lockflag;
int error , uerror, lerror;
iswhiteout = 0;
lockflag = 0;
error = uerror = lerror = ENOENT;
cnp = ap->a_cnp;
nameiop = cnp->cn_nameiop;
cnflags = cnp->cn_flags;
dvp = ap->a_dvp;
dunp = VTOUNIONFS(dvp);
udvp = dunp->un_uppervp;
ldvp = dunp->un_lowervp;
vp = uvp = lvp = NULLVP;
td = curthread;
*(ap->a_vpp) = NULLVP;
UNIONFS_INTERNAL_DEBUG(
"unionfs_lookup: enter: nameiop=%ld, flags=%lx, path=%s\n",
nameiop, cnflags, cnp->cn_nameptr);
if (dvp->v_type != VDIR)
return (ENOTDIR);
/*
* If read-only and op is not LOOKUP, will return EROFS.
*/
if ((cnflags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
LOOKUP != nameiop)
return (EROFS);
/*
* lookup dotdot
*/
if (cnflags & ISDOTDOT) {
if (LOOKUP != nameiop && udvp == NULLVP)
return (EROFS);
if (udvp != NULLVP) {
dtmpvp = udvp;
if (ldvp != NULLVP)
VOP_UNLOCK(ldvp);
}
else
dtmpvp = ldvp;
error = VOP_LOOKUP(dtmpvp, &vp, cnp);
if (dtmpvp == udvp && ldvp != NULLVP) {
VOP_UNLOCK(udvp);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
}
if (error == 0) {
/*
* Exchange lock and reference from vp to
* dunp->un_dvp. vp is upper/lower vnode, but it
* will need to return the unionfs vnode.
*/
if (nameiop == DELETE || nameiop == RENAME ||
(cnp->cn_lkflags & LK_TYPE_MASK))
VOP_UNLOCK(vp);
vrele(vp);
VOP_UNLOCK(dvp);
*(ap->a_vpp) = dunp->un_dvp;
vref(dunp->un_dvp);
if (nameiop == DELETE || nameiop == RENAME)
vn_lock(dunp->un_dvp, LK_EXCLUSIVE | LK_RETRY);
else if (cnp->cn_lkflags & LK_TYPE_MASK)
vn_lock(dunp->un_dvp, cnp->cn_lkflags |
LK_RETRY);
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
} else if (error == ENOENT && (cnflags & MAKEENTRY) != 0)
cache_enter(dvp, NULLVP, cnp);
goto unionfs_lookup_return;
}
/*
* lookup upper layer
*/
if (udvp != NULLVP) {
uerror = VOP_LOOKUP(udvp, &uvp, cnp);
if (uerror == 0) {
if (udvp == uvp) { /* is dot */
vrele(uvp);
*(ap->a_vpp) = dvp;
vref(dvp);
error = uerror;
goto unionfs_lookup_return;
}
if (nameiop == DELETE || nameiop == RENAME ||
(cnp->cn_lkflags & LK_TYPE_MASK))
VOP_UNLOCK(uvp);
}
/* check whiteout */
if (uerror == ENOENT || uerror == EJUSTRETURN)
if (cnp->cn_flags & ISWHITEOUT)
iswhiteout = 1; /* don't lookup lower */
if (iswhiteout == 0 && ldvp != NULLVP)
if (!VOP_GETATTR(udvp, &va, cnp->cn_cred) &&
(va.va_flags & OPAQUE))
iswhiteout = 1; /* don't lookup lower */
#if 0
UNIONFS_INTERNAL_DEBUG(
"unionfs_lookup: debug: whiteout=%d, path=%s\n",
iswhiteout, cnp->cn_nameptr);
#endif
}
/*
* lookup lower layer
*/
if (ldvp != NULLVP && !(cnflags & DOWHITEOUT) && iswhiteout == 0) {
/* always op is LOOKUP */
cnp->cn_nameiop = LOOKUP;
cnflagsbk = cnp->cn_flags;
cnp->cn_flags = cnflags;
lerror = VOP_LOOKUP(ldvp, &lvp, cnp);
cnp->cn_nameiop = nameiop;
if (udvp != NULLVP && (uerror == 0 || uerror == EJUSTRETURN))
cnp->cn_flags = cnflagsbk;
if (lerror == 0) {
if (ldvp == lvp) { /* is dot */
if (uvp != NULLVP)
vrele(uvp); /* no need? */
vrele(lvp);
*(ap->a_vpp) = dvp;
vref(dvp);
UNIONFS_INTERNAL_DEBUG(
"unionfs_lookup: leave (%d)\n", lerror);
return (lerror);
}
if (cnp->cn_lkflags & LK_TYPE_MASK)
VOP_UNLOCK(lvp);
}
}
/*
* check lookup result
*/
if (uvp == NULLVP && lvp == NULLVP) {
error = (udvp != NULLVP ? uerror : lerror);
goto unionfs_lookup_return;
}
/*
* check vnode type
*/
if (uvp != NULLVP && lvp != NULLVP && uvp->v_type != lvp->v_type) {
vrele(lvp);
lvp = NULLVP;
}
/*
* check shadow dir
*/
if (uerror != 0 && uerror != EJUSTRETURN && udvp != NULLVP &&
lerror == 0 && lvp != NULLVP && lvp->v_type == VDIR &&
!(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(1 < cnp->cn_namelen || '.' != *(cnp->cn_nameptr))) {
/* get unionfs vnode in order to create a new shadow dir. */
error = unionfs_nodeget(dvp->v_mount, NULLVP, lvp, dvp, &vp,
cnp, td);
if (error != 0)
goto unionfs_lookup_cleanup;
if (LK_SHARED == (cnp->cn_lkflags & LK_TYPE_MASK))
VOP_UNLOCK(vp);
if (LK_EXCLUSIVE != VOP_ISLOCKED(vp)) {
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
lockflag = 1;
}
error = unionfs_mkshadowdir(MOUNTTOUNIONFSMOUNT(dvp->v_mount),
udvp, VTOUNIONFS(vp), cnp, td);
if (lockflag != 0)
VOP_UNLOCK(vp);
if (error != 0) {
UNIONFSDEBUG(
"unionfs_lookup: Unable to create shadow dir.");
if ((cnp->cn_lkflags & LK_TYPE_MASK) == LK_EXCLUSIVE)
vput(vp);
else
vrele(vp);
goto unionfs_lookup_cleanup;
}
if ((cnp->cn_lkflags & LK_TYPE_MASK) == LK_SHARED)
vn_lock(vp, LK_SHARED | LK_RETRY);
}
/*
* get unionfs vnode.
*/
else {
if (uvp != NULLVP)
error = uerror;
else
error = lerror;
if (error != 0)
goto unionfs_lookup_cleanup;
/*
* get socket vnode.
*/
if (uvp != NULLVP && uvp->v_type == VSOCK) {
vp = uvp;
vref(vp);
if (cnp->cn_lkflags & LK_TYPE_MASK)
vn_lock(vp, cnp->cn_lkflags | LK_RETRY);
}
else if (lvp != NULLVP && lvp->v_type == VSOCK) {
vp = lvp;
vref(vp);
if (cnp->cn_lkflags & LK_TYPE_MASK)
vn_lock(vp, cnp->cn_lkflags | LK_RETRY);
}
/*
* get unionfs vnode.
*/
else
error = unionfs_nodeget(dvp->v_mount, uvp, lvp,
dvp, &vp, cnp, td);
if (error != 0) {
UNIONFSDEBUG(
"unionfs_lookup: Unable to create unionfs vnode.");
goto unionfs_lookup_cleanup;
}
if ((nameiop == DELETE || nameiop == RENAME) &&
(cnp->cn_lkflags & LK_TYPE_MASK) == 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
*(ap->a_vpp) = vp;
if ((cnflags & MAKEENTRY) && vp->v_type != VSOCK)
cache_enter(dvp, vp, cnp);
unionfs_lookup_cleanup:
if (uvp != NULLVP)
vrele(uvp);
if (lvp != NULLVP)
vrele(lvp);
if (error == ENOENT && (cnflags & MAKEENTRY) != 0)
cache_enter(dvp, NULLVP, cnp);
unionfs_lookup_return:
/* Ensure subsequent vnops will get a valid pathname buffer. */
if (nameiop != LOOKUP && (error == 0 || error == EJUSTRETURN))
cnp->cn_flags |= SAVENAME;
UNIONFS_INTERNAL_DEBUG("unionfs_lookup: leave (%d)\n", error);
return (error);
}
static int
unionfs_create(struct vop_create_args *ap)
{
struct unionfs_node *dunp;
struct componentname *cnp;
struct vnode *udvp;
struct vnode *vp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_create: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
udvp = dunp->un_uppervp;
error = EROFS;
if (udvp != NULLVP) {
error = VOP_CREATE(udvp, &vp, cnp, ap->a_vap);
if (error != 0)
goto unionfs_create_abort;
if (vp->v_type == VSOCK)
*(ap->a_vpp) = vp;
else {
VOP_UNLOCK(vp);
error = unionfs_nodeget(ap->a_dvp->v_mount, vp, NULLVP,
ap->a_dvp, ap->a_vpp, cnp, curthread);
vrele(vp);
}
}
unionfs_create_abort:
UNIONFS_INTERNAL_DEBUG("unionfs_create: leave (%d)\n", error);
return (error);
}
static int
unionfs_whiteout(struct vop_whiteout_args *ap)
{
struct unionfs_node *dunp;
struct componentname *cnp;
struct vnode *udvp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_whiteout: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
udvp = dunp->un_uppervp;
error = EOPNOTSUPP;
if (udvp != NULLVP) {
switch (ap->a_flags) {
case CREATE:
case DELETE:
case LOOKUP:
error = VOP_WHITEOUT(udvp, cnp, ap->a_flags);
break;
default:
error = EINVAL;
break;
}
}
UNIONFS_INTERNAL_DEBUG("unionfs_whiteout: leave (%d)\n", error);
return (error);
}
static int
unionfs_mknod(struct vop_mknod_args *ap)
{
struct unionfs_node *dunp;
struct componentname *cnp;
struct vnode *udvp;
struct vnode *vp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_mknod: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
udvp = dunp->un_uppervp;
error = EROFS;
if (udvp != NULLVP) {
error = VOP_MKNOD(udvp, &vp, cnp, ap->a_vap);
if (error != 0)
goto unionfs_mknod_abort;
if (vp->v_type == VSOCK)
*(ap->a_vpp) = vp;
else {
VOP_UNLOCK(vp);
error = unionfs_nodeget(ap->a_dvp->v_mount, vp, NULLVP,
ap->a_dvp, ap->a_vpp, cnp, curthread);
vrele(vp);
}
}
unionfs_mknod_abort:
UNIONFS_INTERNAL_DEBUG("unionfs_mknod: leave (%d)\n", error);
return (error);
}
static int
unionfs_open(struct vop_open_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct vnode *uvp;
struct vnode *lvp;
struct vnode *targetvp;
struct ucred *cred;
struct thread *td;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_open: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
targetvp = NULLVP;
cred = ap->a_cred;
td = ap->a_td;
unionfs_get_node_status(unp, td, &unsp);
if (unsp->uns_lower_opencnt > 0 || unsp->uns_upper_opencnt > 0) {
/* vnode is already opend. */
if (unsp->uns_upper_opencnt > 0)
targetvp = uvp;
else
targetvp = lvp;
if (targetvp == lvp &&
(ap->a_mode & FWRITE) && lvp->v_type == VREG)
targetvp = NULLVP;
}
if (targetvp == NULLVP) {
if (uvp == NULLVP) {
if ((ap->a_mode & FWRITE) && lvp->v_type == VREG) {
error = unionfs_copyfile(unp,
!(ap->a_mode & O_TRUNC), cred, td);
if (error != 0)
goto unionfs_open_abort;
targetvp = uvp = unp->un_uppervp;
} else
targetvp = lvp;
} else
targetvp = uvp;
}
error = VOP_OPEN(targetvp, ap->a_mode, cred, td, ap->a_fp);
if (error == 0) {
if (targetvp == uvp) {
if (uvp->v_type == VDIR && lvp != NULLVP &&
unsp->uns_lower_opencnt <= 0) {
/* open lower for readdir */
error = VOP_OPEN(lvp, FREAD, cred, td, NULL);
if (error != 0) {
VOP_CLOSE(uvp, ap->a_mode, cred, td);
goto unionfs_open_abort;
}
unsp->uns_node_flag |= UNS_OPENL_4_READDIR;
unsp->uns_lower_opencnt++;
}
unsp->uns_upper_opencnt++;
} else {
unsp->uns_lower_opencnt++;
unsp->uns_lower_openmode = ap->a_mode;
}
ap->a_vp->v_object = targetvp->v_object;
}
unionfs_open_abort:
if (error != 0)
unionfs_tryrem_node_status(unp, unsp);
UNIONFS_INTERNAL_DEBUG("unionfs_open: leave (%d)\n", error);
return (error);
}
static int
unionfs_close(struct vop_close_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct ucred *cred;
struct thread *td;
struct vnode *vp;
struct vnode *ovp;
int error;
int locked;
UNIONFS_INTERNAL_DEBUG("unionfs_close: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
locked = 0;
vp = ap->a_vp;
unp = VTOUNIONFS(vp);
cred = ap->a_cred;
td = ap->a_td;
if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
if (vn_lock(vp, LK_UPGRADE) != 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
locked = 1;
}
unionfs_get_node_status(unp, td, &unsp);
if (unsp->uns_lower_opencnt <= 0 && unsp->uns_upper_opencnt <= 0) {
#ifdef DIAGNOSTIC
printf("unionfs_close: warning: open count is 0\n");
#endif
if (unp->un_uppervp != NULLVP)
ovp = unp->un_uppervp;
else
ovp = unp->un_lowervp;
} else if (unsp->uns_upper_opencnt > 0)
ovp = unp->un_uppervp;
else
ovp = unp->un_lowervp;
error = VOP_CLOSE(ovp, ap->a_fflag, cred, td);
if (error != 0)
goto unionfs_close_abort;
vp->v_object = ovp->v_object;
if (ovp == unp->un_uppervp) {
unsp->uns_upper_opencnt--;
if (unsp->uns_upper_opencnt == 0) {
if (unsp->uns_node_flag & UNS_OPENL_4_READDIR) {
VOP_CLOSE(unp->un_lowervp, FREAD, cred, td);
unsp->uns_node_flag &= ~UNS_OPENL_4_READDIR;
unsp->uns_lower_opencnt--;
}
if (unsp->uns_lower_opencnt > 0)
vp->v_object = unp->un_lowervp->v_object;
}
} else
unsp->uns_lower_opencnt--;
unionfs_close_abort:
unionfs_tryrem_node_status(unp, unsp);
if (locked != 0)
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
UNIONFS_INTERNAL_DEBUG("unionfs_close: leave (%d)\n", error);
return (error);
}
/*
* Check the access mode toward shadow file/dir.
*/
static int
unionfs_check_corrected_access(accmode_t accmode, struct vattr *va,
struct ucred *cred)
{
int count;
uid_t uid; /* upper side vnode's uid */
gid_t gid; /* upper side vnode's gid */
u_short vmode; /* upper side vnode's mode */
u_short mask;
mask = 0;
uid = va->va_uid;
gid = va->va_gid;
vmode = va->va_mode;
/* check owner */
if (cred->cr_uid == uid) {
if (accmode & VEXEC)
mask |= S_IXUSR;
if (accmode & VREAD)
mask |= S_IRUSR;
if (accmode & VWRITE)
mask |= S_IWUSR;
return ((vmode & mask) == mask ? 0 : EACCES);
}
/* check group */
count = 0;
if (groupmember(gid, cred)) {
if (accmode & VEXEC)
mask |= S_IXGRP;
if (accmode & VREAD)
mask |= S_IRGRP;
if (accmode & VWRITE)
mask |= S_IWGRP;
return ((vmode & mask) == mask ? 0 : EACCES);
}
/* check other */
if (accmode & VEXEC)
mask |= S_IXOTH;
if (accmode & VREAD)
mask |= S_IROTH;
if (accmode & VWRITE)
mask |= S_IWOTH;
return ((vmode & mask) == mask ? 0 : EACCES);
}
static int
unionfs_access(struct vop_access_args *ap)
{
struct unionfs_mount *ump;
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
struct vattr va;
accmode_t accmode;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_access: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
td = ap->a_td;
accmode = ap->a_accmode;
error = EACCES;
if ((accmode & 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 (uvp != NULLVP) {
error = VOP_ACCESS(uvp, accmode, ap->a_cred, td);
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
return (error);
}
if (lvp != NULLVP) {
if (accmode & VWRITE) {
if (ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY) {
switch (ap->a_vp->v_type) {
case VREG:
case VDIR:
case VLNK:
return (EROFS);
default:
break;
}
} else if (ap->a_vp->v_type == VREG ||
ap->a_vp->v_type == VDIR) {
/* check shadow file/dir */
if (ump->um_copymode != UNIONFS_TRANSPARENT) {
error = unionfs_create_uppervattr(ump,
lvp, &va, ap->a_cred, td);
if (error != 0)
return (error);
error = unionfs_check_corrected_access(
accmode, &va, ap->a_cred);
if (error != 0)
return (error);
}
}
accmode &= ~(VWRITE | VAPPEND);
accmode |= VREAD; /* will copy to upper */
}
error = VOP_ACCESS(lvp, accmode, ap->a_cred, td);
}
UNIONFS_INTERNAL_DEBUG("unionfs_access: leave (%d)\n", error);
return (error);
}
static int
unionfs_getattr(struct vop_getattr_args *ap)
{
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
struct vattr va;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_getattr: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
td = curthread;
if (uvp != NULLVP) {
if ((error = VOP_GETATTR(uvp, ap->a_vap, ap->a_cred)) == 0)
ap->a_vap->va_fsid =
ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
UNIONFS_INTERNAL_DEBUG(
"unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
ap->a_vap->va_mode, ap->a_vap->va_uid,
ap->a_vap->va_gid, error);
return (error);
}
error = VOP_GETATTR(lvp, ap->a_vap, ap->a_cred);
if (error == 0 && !(ump->um_uppervp->v_mount->mnt_flag & MNT_RDONLY)) {
/* correct the attr toward shadow file/dir. */
if (ap->a_vp->v_type == VREG || ap->a_vp->v_type == VDIR) {
unionfs_create_uppervattr_core(ump, ap->a_vap, &va, td);
ap->a_vap->va_mode = va.va_mode;
ap->a_vap->va_uid = va.va_uid;
ap->a_vap->va_gid = va.va_gid;
}
}
if (error == 0)
ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0];
UNIONFS_INTERNAL_DEBUG(
"unionfs_getattr: leave mode=%o, uid=%d, gid=%d (%d)\n",
ap->a_vap->va_mode, ap->a_vap->va_uid, ap->a_vap->va_gid, error);
return (error);
}
static int
unionfs_setattr(struct vop_setattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
struct vattr *vap;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_setattr: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = EROFS;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
td = curthread;
vap = ap->a_vap;
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);
if (uvp == NULLVP && lvp->v_type == VREG) {
error = unionfs_copyfile(unp, (vap->va_size != 0),
ap->a_cred, td);
if (error != 0)
return (error);
uvp = unp->un_uppervp;
}
if (uvp != NULLVP)
error = VOP_SETATTR(uvp, vap, ap->a_cred);
UNIONFS_INTERNAL_DEBUG("unionfs_setattr: leave (%d)\n", error);
return (error);
}
static int
unionfs_read(struct vop_read_args *ap)
{
struct unionfs_node *unp;
struct vnode *tvp;
int error;
/* UNIONFS_INTERNAL_DEBUG("unionfs_read: enter\n"); */
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
error = VOP_READ(tvp, ap->a_uio, ap->a_ioflag, ap->a_cred);
/* UNIONFS_INTERNAL_DEBUG("unionfs_read: leave (%d)\n", error); */
return (error);
}
static int
unionfs_write(struct vop_write_args *ap)
{
struct unionfs_node *unp;
struct vnode *tvp;
int error;
/* UNIONFS_INTERNAL_DEBUG("unionfs_write: enter\n"); */
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
error = VOP_WRITE(tvp, ap->a_uio, ap->a_ioflag, ap->a_cred);
/* UNIONFS_INTERNAL_DEBUG("unionfs_write: leave (%d)\n", error); */
return (error);
}
static int
unionfs_ioctl(struct vop_ioctl_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct vnode *ovp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
unp = VTOUNIONFS(ap->a_vp);
unionfs_get_node_status(unp, ap->a_td, &unsp);
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
unionfs_tryrem_node_status(unp, unsp);
VOP_UNLOCK(ap->a_vp);
if (ovp == NULLVP)
return (EBADF);
error = VOP_IOCTL(ovp, ap->a_command, ap->a_data, ap->a_fflag,
ap->a_cred, ap->a_td);
UNIONFS_INTERNAL_DEBUG("unionfs_ioctl: leave (%d)\n", error);
return (error);
}
static int
unionfs_poll(struct vop_poll_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct vnode *ovp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
unp = VTOUNIONFS(ap->a_vp);
unionfs_get_node_status(unp, ap->a_td, &unsp);
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
unionfs_tryrem_node_status(unp, unsp);
VOP_UNLOCK(ap->a_vp);
if (ovp == NULLVP)
return (EBADF);
return (VOP_POLL(ovp, ap->a_events, ap->a_cred, ap->a_td));
}
static int
unionfs_fsync(struct vop_fsync_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct vnode *ovp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
unionfs_get_node_status(unp, ap->a_td, &unsp);
ovp = (unsp->uns_upper_opencnt ? unp->un_uppervp : unp->un_lowervp);
unionfs_tryrem_node_status(unp, unsp);
if (ovp == NULLVP)
return (EBADF);
return (VOP_FSYNC(ovp, ap->a_waitfor, ap->a_td));
}
static int
unionfs_remove(struct vop_remove_args *ap)
{
char *path;
struct unionfs_node *dunp;
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct vnode *udvp;
struct vnode *uvp;
struct vnode *lvp;
struct vnode *vp;
struct componentname *cnp;
struct componentname cn;
struct thread *td;
int error;
int pathlen;
UNIONFS_INTERNAL_DEBUG("unionfs_remove: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
error = 0;
dunp = VTOUNIONFS(ap->a_dvp);
udvp = dunp->un_uppervp;
cnp = ap->a_cnp;
td = curthread;
if (ap->a_vp->v_op != &unionfs_vnodeops) {
if (ap->a_vp->v_type != VSOCK)
return (EINVAL);
ump = NULL;
vp = uvp = lvp = NULLVP;
/* search vnode */
VOP_UNLOCK(ap->a_vp);
error = unionfs_relookup(udvp, &vp, cnp, &cn, td,
cnp->cn_nameptr, cnp->cn_namelen, DELETE);
if (error != 0 && error != ENOENT) {
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
if (error == 0 && vp == ap->a_vp) {
/* target vnode in upper */
uvp = vp;
vrele(vp);
} else {
/* target vnode in lower */
if (vp != NULLVP) {
if (udvp == vp)
vrele(vp);
else
vput(vp);
}
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
lvp = ap->a_vp;
}
path = cnp->cn_nameptr;
pathlen = cnp->cn_namelen;
} else {
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
path = unp->un_path;
pathlen = unp->un_pathlen;
}
if (udvp == NULLVP)
return (EROFS);
if (uvp != NULLVP) {
/*
* XXX: if the vnode type is VSOCK, it will create whiteout
* after remove.
*/
if (ump == NULL || ump->um_whitemode == UNIONFS_WHITE_ALWAYS ||
lvp != NULLVP)
cnp->cn_flags |= DOWHITEOUT;
error = VOP_REMOVE(udvp, uvp, cnp);
} else if (lvp != NULLVP)
error = unionfs_mkwhiteout(udvp, cnp, td, path, pathlen);
UNIONFS_INTERNAL_DEBUG("unionfs_remove: leave (%d)\n", error);
return (error);
}
static int
unionfs_link(struct vop_link_args *ap)
{
struct unionfs_node *dunp;
struct unionfs_node *unp;
struct vnode *udvp;
struct vnode *uvp;
struct componentname *cnp;
struct thread *td;
int error;
int needrelookup;
UNIONFS_INTERNAL_DEBUG("unionfs_link: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_tdvp);
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
needrelookup = 0;
dunp = VTOUNIONFS(ap->a_tdvp);
unp = NULL;
udvp = dunp->un_uppervp;
uvp = NULLVP;
cnp = ap->a_cnp;
td = curthread;
if (udvp == NULLVP)
return (EROFS);
if (ap->a_vp->v_op != &unionfs_vnodeops)
uvp = ap->a_vp;
else {
unp = VTOUNIONFS(ap->a_vp);
if (unp->un_uppervp == NULLVP) {
if (ap->a_vp->v_type != VREG)
return (EOPNOTSUPP);
error = unionfs_copyfile(unp, 1, cnp->cn_cred, td);
if (error != 0)
return (error);
needrelookup = 1;
}
uvp = unp->un_uppervp;
}
if (needrelookup != 0)
error = unionfs_relookup_for_create(ap->a_tdvp, cnp, td);
if (error == 0)
error = VOP_LINK(udvp, uvp, cnp);
UNIONFS_INTERNAL_DEBUG("unionfs_link: leave (%d)\n", error);
return (error);
}
static int
unionfs_rename(struct vop_rename_args *ap)
{
struct vnode *fdvp;
struct vnode *fvp;
struct componentname *fcnp;
struct vnode *tdvp;
struct vnode *tvp;
struct componentname *tcnp;
struct vnode *ltdvp;
struct vnode *ltvp;
struct thread *td;
/* rename target vnodes */
struct vnode *rfdvp;
struct vnode *rfvp;
struct vnode *rtdvp;
struct vnode *rtvp;
struct unionfs_mount *ump;
struct unionfs_node *unp;
int error;
int needrelookup;
UNIONFS_INTERNAL_DEBUG("unionfs_rename: enter\n");
error = 0;
fdvp = ap->a_fdvp;
fvp = ap->a_fvp;
fcnp = ap->a_fcnp;
tdvp = ap->a_tdvp;
tvp = ap->a_tvp;
tcnp = ap->a_tcnp;
ltdvp = NULLVP;
ltvp = NULLVP;
td = curthread;
rfdvp = fdvp;
rfvp = fvp;
rtdvp = tdvp;
rtvp = tvp;
needrelookup = 0;
#ifdef DIAGNOSTIC
if (!(fcnp->cn_flags & HASBUF) || !(tcnp->cn_flags & HASBUF))
panic("unionfs_rename: no name");
#endif
/* check for cross device rename */
if (fvp->v_mount != tdvp->v_mount ||
(tvp != NULLVP && fvp->v_mount != tvp->v_mount)) {
if (fvp->v_op != &unionfs_vnodeops)
error = ENODEV;
else
error = EXDEV;
goto unionfs_rename_abort;
}
/* Renaming a file to itself has no effect. */
if (fvp == tvp)
goto unionfs_rename_abort;
/*
* from/to vnode is unionfs node.
*/
KASSERT_UNIONFS_VNODE(fdvp);
KASSERT_UNIONFS_VNODE(fvp);
KASSERT_UNIONFS_VNODE(tdvp);
if (tvp != NULLVP)
KASSERT_UNIONFS_VNODE(tvp);
unp = VTOUNIONFS(fdvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("fdvp=%p, ufdvp=%p, lfdvp=%p\n",
fdvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP) {
error = ENODEV;
goto unionfs_rename_abort;
}
rfdvp = unp->un_uppervp;
vref(rfdvp);
unp = VTOUNIONFS(fvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("fvp=%p, ufvp=%p, lfvp=%p\n",
fvp, unp->un_uppervp, unp->un_lowervp);
#endif
ump = MOUNTTOUNIONFSMOUNT(fvp->v_mount);
if (unp->un_uppervp == NULLVP) {
switch (fvp->v_type) {
case VREG:
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_copyfile(unp, 1, fcnp->cn_cred, td);
VOP_UNLOCK(fvp);
if (error != 0)
goto unionfs_rename_abort;
break;
case VDIR:
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_mkshadowdir(ump, rfdvp, unp, fcnp, td);
VOP_UNLOCK(fvp);
if (error != 0)
goto unionfs_rename_abort;
break;
default:
error = ENODEV;
goto unionfs_rename_abort;
}
needrelookup = 1;
}
if (unp->un_lowervp != NULLVP)
fcnp->cn_flags |= DOWHITEOUT;
rfvp = unp->un_uppervp;
vref(rfvp);
unp = VTOUNIONFS(tdvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("tdvp=%p, utdvp=%p, ltdvp=%p\n",
tdvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP) {
error = ENODEV;
goto unionfs_rename_abort;
}
rtdvp = unp->un_uppervp;
ltdvp = unp->un_lowervp;
vref(rtdvp);
if (tdvp == tvp) {
rtvp = rtdvp;
vref(rtvp);
} else if (tvp != NULLVP) {
unp = VTOUNIONFS(tvp);
#ifdef UNIONFS_IDBG_RENAME
UNIONFS_INTERNAL_DEBUG("tvp=%p, utvp=%p, ltvp=%p\n",
tvp, unp->un_uppervp, unp->un_lowervp);
#endif
if (unp->un_uppervp == NULLVP)
rtvp = NULLVP;
else {
if (tvp->v_type == VDIR) {
error = EINVAL;
goto unionfs_rename_abort;
}
rtvp = unp->un_uppervp;
ltvp = unp->un_lowervp;
vref(rtvp);
}
}
if (rfvp == rtvp)
goto unionfs_rename_abort;
if (needrelookup != 0) {
if ((error = vn_lock(fdvp, LK_EXCLUSIVE)) != 0)
goto unionfs_rename_abort;
error = unionfs_relookup_for_delete(fdvp, fcnp, td);
VOP_UNLOCK(fdvp);
if (error != 0)
goto unionfs_rename_abort;
/* Lock of tvp is canceled in order to avoid recursive lock. */
if (tvp != NULLVP && tvp != tdvp)
VOP_UNLOCK(tvp);
error = unionfs_relookup_for_rename(tdvp, tcnp, td);
if (tvp != NULLVP && tvp != tdvp)
vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
goto unionfs_rename_abort;
}
error = VOP_RENAME(rfdvp, rfvp, fcnp, rtdvp, rtvp, tcnp);
if (error == 0) {
if (rtvp != NULLVP && rtvp->v_type == VDIR)
cache_purge(tdvp);
if (fvp->v_type == VDIR && fdvp != tdvp)
cache_purge(fdvp);
}
if (ltdvp != NULLVP)
VOP_UNLOCK(ltdvp);
if (tdvp != rtdvp)
vrele(tdvp);
if (ltvp != NULLVP)
VOP_UNLOCK(ltvp);
if (tvp != rtvp && tvp != NULLVP) {
if (rtvp == NULLVP)
vput(tvp);
else
vrele(tvp);
}
if (fdvp != rfdvp)
vrele(fdvp);
if (fvp != rfvp)
vrele(fvp);
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
return (error);
unionfs_rename_abort:
vput(tdvp);
if (tdvp != rtdvp)
vrele(rtdvp);
if (tvp != NULLVP) {
if (tdvp != tvp)
vput(tvp);
else
vrele(tvp);
}
if (tvp != rtvp && rtvp != NULLVP)
vrele(rtvp);
if (fdvp != rfdvp)
vrele(rfdvp);
if (fvp != rfvp)
vrele(rfvp);
vrele(fdvp);
vrele(fvp);
UNIONFS_INTERNAL_DEBUG("unionfs_rename: leave (%d)\n", error);
return (error);
}
static int
unionfs_mkdir(struct vop_mkdir_args *ap)
{
struct unionfs_node *dunp;
struct componentname *cnp;
struct thread *td;
struct vnode *udvp;
struct vnode *uvp;
struct vattr va;
int error;
int lkflags;
UNIONFS_INTERNAL_DEBUG("unionfs_mkdir: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
error = EROFS;
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
lkflags = cnp->cn_lkflags;
td = curthread;
udvp = dunp->un_uppervp;
if (udvp != NULLVP) {
/* check opaque */
if (!(cnp->cn_flags & ISWHITEOUT)) {
error = VOP_GETATTR(udvp, &va, cnp->cn_cred);
if (error != 0)
return (error);
if ((va.va_flags & OPAQUE) != 0)
cnp->cn_flags |= ISWHITEOUT;
}
if ((error = VOP_MKDIR(udvp, &uvp, cnp, ap->a_vap)) == 0) {
VOP_UNLOCK(uvp);
cnp->cn_lkflags = LK_EXCLUSIVE;
error = unionfs_nodeget(ap->a_dvp->v_mount, uvp, NULLVP,
ap->a_dvp, ap->a_vpp, cnp, td);
cnp->cn_lkflags = lkflags;
vrele(uvp);
}
}
UNIONFS_INTERNAL_DEBUG("unionfs_mkdir: leave (%d)\n", error);
return (error);
}
static int
unionfs_rmdir(struct vop_rmdir_args *ap)
{
struct unionfs_node *dunp;
struct unionfs_node *unp;
struct unionfs_mount *ump;
struct componentname *cnp;
struct thread *td;
struct vnode *udvp;
struct vnode *uvp;
struct vnode *lvp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
dunp = VTOUNIONFS(ap->a_dvp);
unp = VTOUNIONFS(ap->a_vp);
cnp = ap->a_cnp;
td = curthread;
udvp = dunp->un_uppervp;
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
if (udvp == NULLVP)
return (EROFS);
if (udvp == uvp)
return (EOPNOTSUPP);
if (uvp != NULLVP) {
if (lvp != NULLVP) {
error = unionfs_check_rmdir(ap->a_vp, cnp->cn_cred, td);
if (error != 0)
return (error);
}
ump = MOUNTTOUNIONFSMOUNT(ap->a_vp->v_mount);
if (ump->um_whitemode == UNIONFS_WHITE_ALWAYS || lvp != NULLVP)
cnp->cn_flags |= DOWHITEOUT;
/*
* The relookup path will need to relock the parent dvp and
* possibly the vp as well. Locking is expected to be done
* in parent->child order; drop the lock on vp to avoid LOR
* and potential recursion on vp's lock.
* vp is expected to remain referenced during VOP_RMDIR(),
* so vref/vrele should not be necessary here.
*/
VOP_UNLOCK(ap->a_vp);
VNPASS(vrefcnt(ap->a_vp) > 0, ap->a_vp);
error = unionfs_relookup_for_delete(ap->a_dvp, cnp, td);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
if (error == 0 && VN_IS_DOOMED(uvp))
error = ENOENT;
if (error == 0)
error = VOP_RMDIR(udvp, uvp, cnp);
} else if (lvp != NULLVP)
error = unionfs_mkwhiteout(udvp, cnp, td,
unp->un_path, unp->un_pathlen);
if (error == 0) {
cache_purge(ap->a_dvp);
cache_purge(ap->a_vp);
}
UNIONFS_INTERNAL_DEBUG("unionfs_rmdir: leave (%d)\n", error);
return (error);
}
static int
unionfs_symlink(struct vop_symlink_args *ap)
{
struct unionfs_node *dunp;
struct componentname *cnp;
struct thread *td;
struct vnode *udvp;
struct vnode *uvp;
int error;
int lkflags;
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_dvp);
error = EROFS;
dunp = VTOUNIONFS(ap->a_dvp);
cnp = ap->a_cnp;
lkflags = cnp->cn_lkflags;
td = curthread;
udvp = dunp->un_uppervp;
if (udvp != NULLVP) {
error = VOP_SYMLINK(udvp, &uvp, cnp, ap->a_vap, ap->a_target);
if (error == 0) {
VOP_UNLOCK(uvp);
cnp->cn_lkflags = LK_EXCLUSIVE;
error = unionfs_nodeget(ap->a_dvp->v_mount, uvp, NULLVP,
ap->a_dvp, ap->a_vpp, cnp, td);
cnp->cn_lkflags = lkflags;
vrele(uvp);
}
}
UNIONFS_INTERNAL_DEBUG("unionfs_symlink: leave (%d)\n", error);
return (error);
}
static int
unionfs_readdir(struct vop_readdir_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct uio *uio;
struct vnode *vp;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
struct vattr va;
u_long *cookies_bk;
int error;
int eofflag;
int locked;
int ncookies_bk;
int uio_offset_bk;
UNIONFS_INTERNAL_DEBUG("unionfs_readdir: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
eofflag = 0;
locked = 0;
uio_offset_bk = 0;
uio = ap->a_uio;
uvp = NULLVP;
lvp = NULLVP;
td = uio->uio_td;
ncookies_bk = 0;
cookies_bk = NULL;
vp = ap->a_vp;
if (vp->v_type != VDIR)
return (ENOTDIR);
/* check the open count. unionfs needs to open before readdir. */
if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
if (vn_lock(vp, LK_UPGRADE) != 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
locked = 1;
}
unp = VTOUNIONFS(vp);
if (unp == NULL)
error = EBADF;
else {
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
unionfs_get_node_status(unp, td, &unsp);
if ((uvp != NULLVP && unsp->uns_upper_opencnt <= 0) ||
(lvp != NULLVP && unsp->uns_lower_opencnt <= 0)) {
unionfs_tryrem_node_status(unp, unsp);
error = EBADF;
}
}
if (locked)
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
if (error != 0)
goto unionfs_readdir_exit;
/* check opaque */
if (uvp != NULLVP && lvp != NULLVP) {
if ((error = VOP_GETATTR(uvp, &va, ap->a_cred)) != 0)
goto unionfs_readdir_exit;
if (va.va_flags & OPAQUE)
lvp = NULLVP;
}
/* upper only */
if (uvp != NULLVP && lvp == NULLVP) {
error = VOP_READDIR(uvp, uio, ap->a_cred, ap->a_eofflag,
ap->a_ncookies, ap->a_cookies);
unsp->uns_readdir_status = 0;
goto unionfs_readdir_exit;
}
/* lower only */
if (uvp == NULLVP && lvp != NULLVP) {
error = VOP_READDIR(lvp, uio, ap->a_cred, ap->a_eofflag,
ap->a_ncookies, ap->a_cookies);
unsp->uns_readdir_status = 2;
goto unionfs_readdir_exit;
}
/*
* readdir upper and lower
*/
KASSERT(uvp != NULLVP, ("unionfs_readdir: null upper vp"));
KASSERT(lvp != NULLVP, ("unionfs_readdir: null lower vp"));
if (uio->uio_offset == 0)
unsp->uns_readdir_status = 0;
if (unsp->uns_readdir_status == 0) {
/* read upper */
error = VOP_READDIR(uvp, uio, ap->a_cred, &eofflag,
ap->a_ncookies, ap->a_cookies);
if (error != 0 || eofflag == 0)
goto unionfs_readdir_exit;
unsp->uns_readdir_status = 1;
/*
* UFS(and other FS) needs size of uio_resid larger than
* DIRBLKSIZ.
* size of DIRBLKSIZ equals DEV_BSIZE.
* (see: ufs/ufs/ufs_vnops.c ufs_readdir func , ufs/ufs/dir.h)
*/
if (uio->uio_resid <= (uio->uio_resid & (DEV_BSIZE -1)))
goto unionfs_readdir_exit;
/*
* Backup cookies.
* It prepares to readdir in lower.
*/
if (ap->a_ncookies != NULL) {
ncookies_bk = *(ap->a_ncookies);
*(ap->a_ncookies) = 0;
}
if (ap->a_cookies != NULL) {
cookies_bk = *(ap->a_cookies);
*(ap->a_cookies) = NULL;
}
}
/* initialize for readdir in lower */
if (unsp->uns_readdir_status == 1) {
unsp->uns_readdir_status = 2;
/*
* Backup uio_offset. See the comment after the
* VOP_READDIR call on the lower layer.
*/
uio_offset_bk = uio->uio_offset;
uio->uio_offset = 0;
}
if (lvp == NULLVP) {
error = EBADF;
goto unionfs_readdir_exit;
}
/* read lower */
error = VOP_READDIR(lvp, uio, ap->a_cred, ap->a_eofflag,
ap->a_ncookies, ap->a_cookies);
/*
* We can't return an uio_offset of 0: this would trigger an
* infinite loop, because the next call to unionfs_readdir would
* always restart with the upper layer (uio_offset == 0) and
* always return some data.
*
* This happens when the lower layer root directory is removed.
* (A root directory deleting of unionfs should not be permitted.
* But current VFS can not do it.)
*/
if (uio->uio_offset == 0)
uio->uio_offset = uio_offset_bk;
if (cookies_bk != NULL) {
/* merge cookies */
int size;
u_long *newcookies, *pos;
size = *(ap->a_ncookies) + ncookies_bk;
newcookies = (u_long *) malloc(size * sizeof(u_long),
M_TEMP, M_WAITOK);
pos = newcookies;
memcpy(pos, cookies_bk, ncookies_bk * sizeof(u_long));
pos += ncookies_bk;
memcpy(pos, *(ap->a_cookies),
*(ap->a_ncookies) * sizeof(u_long));
free(cookies_bk, M_TEMP);
free(*(ap->a_cookies), M_TEMP);
*(ap->a_ncookies) = size;
*(ap->a_cookies) = newcookies;
}
unionfs_readdir_exit:
if (error != 0 && ap->a_eofflag != NULL)
*(ap->a_eofflag) = 1;
UNIONFS_INTERNAL_DEBUG("unionfs_readdir: leave (%d)\n", error);
return (error);
}
static int
unionfs_readlink(struct vop_readlink_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
error = VOP_READLINK(vp, ap->a_uio, ap->a_cred);
UNIONFS_INTERNAL_DEBUG("unionfs_readlink: leave (%d)\n", error);
return (error);
}
static int
unionfs_getwritemount(struct vop_getwritemount_args *ap)
{
struct vnode *uvp;
struct vnode *vp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_getwritemount: enter\n");
error = 0;
vp = ap->a_vp;
if (vp == NULLVP || (vp->v_mount->mnt_flag & MNT_RDONLY))
return (EACCES);
KASSERT_UNIONFS_VNODE(vp);
uvp = UNIONFSVPTOUPPERVP(vp);
if (uvp == NULLVP && VREG == vp->v_type)
uvp = UNIONFSVPTOUPPERVP(VTOUNIONFS(vp)->un_dvp);
if (uvp != NULLVP)
error = VOP_GETWRITEMOUNT(uvp, ap->a_mpp);
else {
VI_LOCK(vp);
if (vp->v_holdcnt == 0)
error = EOPNOTSUPP;
else
error = EACCES;
VI_UNLOCK(vp);
}
UNIONFS_INTERNAL_DEBUG("unionfs_getwritemount: leave (%d)\n", error);
return (error);
}
static int
unionfs_inactive(struct vop_inactive_args *ap)
{
ap->a_vp->v_object = NULL;
vrecycle(ap->a_vp);
return (0);
}
static int
unionfs_reclaim(struct vop_reclaim_args *ap)
{
/* UNIONFS_INTERNAL_DEBUG("unionfs_reclaim: enter\n"); */
unionfs_noderem(ap->a_vp, curthread);
/* UNIONFS_INTERNAL_DEBUG("unionfs_reclaim: leave\n"); */
return (0);
}
static int
unionfs_print(struct vop_print_args *ap)
{
struct unionfs_node *unp;
/* struct unionfs_node_status *unsp; */
unp = VTOUNIONFS(ap->a_vp);
/* unionfs_get_node_status(unp, curthread, &unsp); */
printf("unionfs_vp=%p, uppervp=%p, lowervp=%p\n",
ap->a_vp, unp->un_uppervp, unp->un_lowervp);
/*
printf("unionfs opencnt: uppervp=%d, lowervp=%d\n",
unsp->uns_upper_opencnt, unsp->uns_lower_opencnt);
*/
if (unp->un_uppervp != NULLVP)
vn_printf(unp->un_uppervp, "unionfs: upper ");
if (unp->un_lowervp != NULLVP)
vn_printf(unp->un_lowervp, "unionfs: lower ");
return (0);
}
static int
unionfs_islocked(struct vop_islocked_args *ap)
{
struct unionfs_node *unp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
if (unp == NULL)
return (vop_stdislocked(ap));
if (unp->un_uppervp != NULLVP)
return (VOP_ISLOCKED(unp->un_uppervp));
if (unp->un_lowervp != NULLVP)
return (VOP_ISLOCKED(unp->un_lowervp));
return (vop_stdislocked(ap));
}
static int
unionfs_get_llt_revlock(struct vnode *vp, int flags)
{
int revlock;
revlock = 0;
switch (flags & LK_TYPE_MASK) {
case LK_SHARED:
if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE)
revlock = LK_UPGRADE;
else
revlock = LK_RELEASE;
break;
case LK_EXCLUSIVE:
case LK_UPGRADE:
revlock = LK_RELEASE;
break;
case LK_DOWNGRADE:
revlock = LK_UPGRADE;
break;
default:
break;
}
return (revlock);
}
/*
* The state of an acquired lock is adjusted similarly to
* the time of error generating.
* flags: LK_RELEASE or LK_UPGRADE
*/
static void
unionfs_revlock(struct vnode *vp, int flags)
{
if (flags & LK_RELEASE)
VOP_UNLOCK_FLAGS(vp, flags);
else {
/* UPGRADE */
if (vn_lock(vp, flags) != 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
}
static int
unionfs_lock(struct vop_lock1_args *ap)
{
struct mount *mp;
struct unionfs_mount *ump;
struct unionfs_node *unp;
struct vnode *vp;
struct vnode *uvp;
struct vnode *lvp;
int error;
int flags;
int revlock;
int interlock;
int uhold;
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
interlock = 1;
uhold = 0;
flags = ap->a_flags;
vp = ap->a_vp;
if (LK_RELEASE == (flags & LK_TYPE_MASK) || !(flags & LK_TYPE_MASK))
return (VOP_UNLOCK_FLAGS(vp, flags | LK_RELEASE));
if ((flags & LK_INTERLOCK) == 0)
VI_LOCK(vp);
mp = vp->v_mount;
if (mp == NULL)
goto unionfs_lock_null_vnode;
ump = MOUNTTOUNIONFSMOUNT(mp);
unp = VTOUNIONFS(vp);
if (ump == NULL || unp == NULL)
goto unionfs_lock_null_vnode;
lvp = unp->un_lowervp;
uvp = unp->un_uppervp;
if ((revlock = unionfs_get_llt_revlock(vp, flags)) == 0)
panic("unknown lock type: 0x%x", flags & LK_TYPE_MASK);
if ((vp->v_iflag & VI_OWEINACT) != 0)
flags |= LK_NOWAIT;
/*
* Sometimes, lower or upper is already exclusive locked.
* (ex. vfs_domount: mounted vnode is already locked.)
*/
if ((flags & LK_TYPE_MASK) == LK_EXCLUSIVE &&
vp == ump->um_rootvp)
flags |= LK_CANRECURSE;
if (lvp != NULLVP) {
if (uvp != NULLVP && flags & LK_UPGRADE) {
/*
* Share Lock is once released and a deadlock is
* avoided.
*/
vholdnz(uvp);
uhold = 1;
VOP_UNLOCK(uvp);
unp = VTOUNIONFS(vp);
if (unp == NULL) {
/* vnode is released. */
VI_UNLOCK(vp);
VOP_UNLOCK(lvp);
vdrop(uvp);
return (EBUSY);
}
}
VI_LOCK_FLAGS(lvp, MTX_DUPOK);
flags |= LK_INTERLOCK;
vholdl(lvp);
VI_UNLOCK(vp);
ap->a_flags &= ~LK_INTERLOCK;
error = VOP_LOCK(lvp, flags);
VI_LOCK(vp);
unp = VTOUNIONFS(vp);
if (unp == NULL) {
/* vnode is released. */
VI_UNLOCK(vp);
if (error == 0)
VOP_UNLOCK(lvp);
vdrop(lvp);
if (uhold != 0)
vdrop(uvp);
return (vop_stdlock(ap));
}
}
if (error == 0 && uvp != NULLVP) {
if (uhold && flags & LK_UPGRADE) {
flags &= ~LK_TYPE_MASK;
flags |= LK_EXCLUSIVE;
}
VI_LOCK_FLAGS(uvp, MTX_DUPOK);
flags |= LK_INTERLOCK;
if (uhold == 0) {
vholdl(uvp);
uhold = 1;
}
VI_UNLOCK(vp);
ap->a_flags &= ~LK_INTERLOCK;
error = VOP_LOCK(uvp, flags);
VI_LOCK(vp);
unp = VTOUNIONFS(vp);
if (unp == NULL) {
/* vnode is released. */
VI_UNLOCK(vp);
if (error == 0)
VOP_UNLOCK(uvp);
vdrop(uvp);
if (lvp != NULLVP) {
VOP_UNLOCK(lvp);
vdrop(lvp);
}
return (vop_stdlock(ap));
}
if (error != 0 && lvp != NULLVP) {
/* rollback */
VI_UNLOCK(vp);
unionfs_revlock(lvp, revlock);
interlock = 0;
}
}
if (interlock)
VI_UNLOCK(vp);
if (lvp != NULLVP)
vdrop(lvp);
if (uhold != 0)
vdrop(uvp);
return (error);
unionfs_lock_null_vnode:
ap->a_flags |= LK_INTERLOCK;
return (vop_stdlock(ap));
}
static int
unionfs_unlock(struct vop_unlock_args *ap)
{
struct vnode *vp;
struct vnode *lvp;
struct vnode *uvp;
struct unionfs_node *unp;
int error;
int uhold;
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = 0;
uhold = 0;
vp = ap->a_vp;
unp = VTOUNIONFS(vp);
if (unp == NULL)
goto unionfs_unlock_null_vnode;
lvp = unp->un_lowervp;
uvp = unp->un_uppervp;
if (lvp != NULLVP) {
vholdnz(lvp);
error = VOP_UNLOCK(lvp);
}
if (error == 0 && uvp != NULLVP) {
vholdnz(uvp);
uhold = 1;
error = VOP_UNLOCK(uvp);
}
if (lvp != NULLVP)
vdrop(lvp);
if (uhold != 0)
vdrop(uvp);
return error;
unionfs_unlock_null_vnode:
return (vop_stdunlock(ap));
}
static int
unionfs_pathconf(struct vop_pathconf_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
return (VOP_PATHCONF(vp, ap->a_name, ap->a_retval));
}
static int
unionfs_advlock(struct vop_advlock_args *ap)
{
struct unionfs_node *unp;
struct unionfs_node_status *unsp;
struct vnode *vp;
struct vnode *uvp;
struct thread *td;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
vp = ap->a_vp;
td = curthread;
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
if (uvp == NULLVP) {
error = unionfs_copyfile(unp, 1, td->td_ucred, td);
if (error != 0)
goto unionfs_advlock_abort;
uvp = unp->un_uppervp;
unionfs_get_node_status(unp, td, &unsp);
if (unsp->uns_lower_opencnt > 0) {
/* try reopen the vnode */
error = VOP_OPEN(uvp, unsp->uns_lower_openmode,
td->td_ucred, td, NULL);
if (error)
goto unionfs_advlock_abort;
unsp->uns_upper_opencnt++;
VOP_CLOSE(unp->un_lowervp, unsp->uns_lower_openmode,
td->td_ucred, td);
unsp->uns_lower_opencnt--;
} else
unionfs_tryrem_node_status(unp, unsp);
}
VOP_UNLOCK(vp);
error = VOP_ADVLOCK(uvp, ap->a_id, ap->a_op, ap->a_fl, ap->a_flags);
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: leave (%d)\n", error);
return error;
unionfs_advlock_abort:
VOP_UNLOCK(vp);
UNIONFS_INTERNAL_DEBUG("unionfs_advlock: leave (%d)\n", error);
return error;
}
static int
unionfs_strategy(struct vop_strategy_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
#ifdef DIAGNOSTIC
if (vp == NULLVP)
panic("unionfs_strategy: nullvp");
if (ap->a_bp->b_iocmd == BIO_WRITE && vp == unp->un_lowervp)
panic("unionfs_strategy: writing to lowervp");
#endif
return (VOP_STRATEGY(vp, ap->a_bp));
}
static int
unionfs_getacl(struct vop_getacl_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
int error;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
UNIONFS_INTERNAL_DEBUG("unionfs_getacl: enter\n");
error = VOP_GETACL(vp, ap->a_type, ap->a_aclp, ap->a_cred, ap->a_td);
UNIONFS_INTERNAL_DEBUG("unionfs_getacl: leave (%d)\n", error);
return (error);
}
static int
unionfs_setacl(struct vop_setacl_args *ap)
{
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_setacl: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = EROFS;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
td = ap->a_td;
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (uvp == NULLVP && lvp->v_type == VREG) {
if ((error = unionfs_copyfile(unp, 1, ap->a_cred, td)) != 0)
return (error);
uvp = unp->un_uppervp;
}
if (uvp != NULLVP)
error = VOP_SETACL(uvp, ap->a_type, ap->a_aclp, ap->a_cred, td);
UNIONFS_INTERNAL_DEBUG("unionfs_setacl: leave (%d)\n", error);
return (error);
}
static int
unionfs_aclcheck(struct vop_aclcheck_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_aclcheck: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
error = VOP_ACLCHECK(vp, ap->a_type, ap->a_aclp, ap->a_cred, ap->a_td);
UNIONFS_INTERNAL_DEBUG("unionfs_aclcheck: leave (%d)\n", error);
return (error);
}
static int
unionfs_openextattr(struct vop_openextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
struct vnode *tvp;
int error;
KASSERT_UNIONFS_VNODE(ap->a_vp);
vp = ap->a_vp;
unp = VTOUNIONFS(vp);
tvp = (unp->un_uppervp != NULLVP ? unp->un_uppervp : unp->un_lowervp);
if ((tvp == unp->un_uppervp && (unp->un_flag & UNIONFS_OPENEXTU)) ||
(tvp == unp->un_lowervp && (unp->un_flag & UNIONFS_OPENEXTL)))
return (EBUSY);
error = VOP_OPENEXTATTR(tvp, ap->a_cred, ap->a_td);
if (error == 0) {
if (vn_lock(vp, LK_UPGRADE) != 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (tvp == unp->un_uppervp)
unp->un_flag |= UNIONFS_OPENEXTU;
else
unp->un_flag |= UNIONFS_OPENEXTL;
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
}
return (error);
}
static int
unionfs_closeextattr(struct vop_closeextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
struct vnode *tvp;
int error;
KASSERT_UNIONFS_VNODE(ap->a_vp);
vp = ap->a_vp;
unp = VTOUNIONFS(vp);
tvp = NULLVP;
if (unp->un_flag & UNIONFS_OPENEXTU)
tvp = unp->un_uppervp;
else if (unp->un_flag & UNIONFS_OPENEXTL)
tvp = unp->un_lowervp;
if (tvp == NULLVP)
return (EOPNOTSUPP);
error = VOP_CLOSEEXTATTR(tvp, ap->a_commit, ap->a_cred, ap->a_td);
if (error == 0) {
if (vn_lock(vp, LK_UPGRADE) != 0)
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (tvp == unp->un_uppervp)
unp->un_flag &= ~UNIONFS_OPENEXTU;
else
unp->un_flag &= ~UNIONFS_OPENEXTL;
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
}
return (error);
}
static int
unionfs_getextattr(struct vop_getextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = NULLVP;
if (unp->un_flag & UNIONFS_OPENEXTU)
vp = unp->un_uppervp;
else if (unp->un_flag & UNIONFS_OPENEXTL)
vp = unp->un_lowervp;
if (vp == NULLVP)
return (EOPNOTSUPP);
return (VOP_GETEXTATTR(vp, ap->a_attrnamespace, ap->a_name,
ap->a_uio, ap->a_size, ap->a_cred, ap->a_td));
}
static int
unionfs_setextattr(struct vop_setextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct vnode *ovp;
struct ucred *cred;
struct thread *td;
int error;
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = EROFS;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
ovp = NULLVP;
cred = ap->a_cred;
td = ap->a_td;
UNIONFS_INTERNAL_DEBUG("unionfs_setextattr: enter (un_flag=%x)\n",
unp->un_flag);
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (unp->un_flag & UNIONFS_OPENEXTU)
ovp = unp->un_uppervp;
else if (unp->un_flag & UNIONFS_OPENEXTL)
ovp = unp->un_lowervp;
if (ovp == NULLVP)
return (EOPNOTSUPP);
if (ovp == lvp && lvp->v_type == VREG) {
VOP_CLOSEEXTATTR(lvp, 0, cred, td);
if (uvp == NULLVP &&
(error = unionfs_copyfile(unp, 1, cred, td)) != 0) {
unionfs_setextattr_reopen:
if ((unp->un_flag & UNIONFS_OPENEXTL) &&
VOP_OPENEXTATTR(lvp, cred, td)) {
#ifdef DIAGNOSTIC
panic("unionfs: VOP_OPENEXTATTR failed");
#endif
unp->un_flag &= ~UNIONFS_OPENEXTL;
}
goto unionfs_setextattr_abort;
}
uvp = unp->un_uppervp;
if ((error = VOP_OPENEXTATTR(uvp, cred, td)) != 0)
goto unionfs_setextattr_reopen;
unp->un_flag &= ~UNIONFS_OPENEXTL;
unp->un_flag |= UNIONFS_OPENEXTU;
ovp = uvp;
}
if (ovp == uvp)
error = VOP_SETEXTATTR(ovp, ap->a_attrnamespace, ap->a_name,
ap->a_uio, cred, td);
unionfs_setextattr_abort:
UNIONFS_INTERNAL_DEBUG("unionfs_setextattr: leave (%d)\n", error);
return (error);
}
static int
unionfs_listextattr(struct vop_listextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *vp;
KASSERT_UNIONFS_VNODE(ap->a_vp);
unp = VTOUNIONFS(ap->a_vp);
vp = NULLVP;
if (unp->un_flag & UNIONFS_OPENEXTU)
vp = unp->un_uppervp;
else if (unp->un_flag & UNIONFS_OPENEXTL)
vp = unp->un_lowervp;
if (vp == NULLVP)
return (EOPNOTSUPP);
return (VOP_LISTEXTATTR(vp, ap->a_attrnamespace, ap->a_uio,
ap->a_size, ap->a_cred, ap->a_td));
}
static int
unionfs_deleteextattr(struct vop_deleteextattr_args *ap)
{
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct vnode *ovp;
struct ucred *cred;
struct thread *td;
int error;
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = EROFS;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
ovp = NULLVP;
cred = ap->a_cred;
td = ap->a_td;
UNIONFS_INTERNAL_DEBUG("unionfs_deleteextattr: enter (un_flag=%x)\n",
unp->un_flag);
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (unp->un_flag & UNIONFS_OPENEXTU)
ovp = unp->un_uppervp;
else if (unp->un_flag & UNIONFS_OPENEXTL)
ovp = unp->un_lowervp;
if (ovp == NULLVP)
return (EOPNOTSUPP);
if (ovp == lvp && lvp->v_type == VREG) {
VOP_CLOSEEXTATTR(lvp, 0, cred, td);
if (uvp == NULLVP &&
(error = unionfs_copyfile(unp, 1, cred, td)) != 0) {
unionfs_deleteextattr_reopen:
if ((unp->un_flag & UNIONFS_OPENEXTL) &&
VOP_OPENEXTATTR(lvp, cred, td)) {
#ifdef DIAGNOSTIC
panic("unionfs: VOP_OPENEXTATTR failed");
#endif
unp->un_flag &= ~UNIONFS_OPENEXTL;
}
goto unionfs_deleteextattr_abort;
}
uvp = unp->un_uppervp;
if ((error = VOP_OPENEXTATTR(uvp, cred, td)) != 0)
goto unionfs_deleteextattr_reopen;
unp->un_flag &= ~UNIONFS_OPENEXTL;
unp->un_flag |= UNIONFS_OPENEXTU;
ovp = uvp;
}
if (ovp == uvp)
error = VOP_DELETEEXTATTR(ovp, ap->a_attrnamespace, ap->a_name,
ap->a_cred, ap->a_td);
unionfs_deleteextattr_abort:
UNIONFS_INTERNAL_DEBUG("unionfs_deleteextattr: leave (%d)\n", error);
return (error);
}
static int
unionfs_setlabel(struct vop_setlabel_args *ap)
{
struct unionfs_node *unp;
struct vnode *uvp;
struct vnode *lvp;
struct thread *td;
int error;
UNIONFS_INTERNAL_DEBUG("unionfs_setlabel: enter\n");
KASSERT_UNIONFS_VNODE(ap->a_vp);
error = EROFS;
unp = VTOUNIONFS(ap->a_vp);
uvp = unp->un_uppervp;
lvp = unp->un_lowervp;
td = ap->a_td;
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (uvp == NULLVP && lvp->v_type == VREG) {
if ((error = unionfs_copyfile(unp, 1, ap->a_cred, td)) != 0)
return (error);
uvp = unp->un_uppervp;
}
if (uvp != NULLVP)
error = VOP_SETLABEL(uvp, ap->a_label, ap->a_cred, td);
UNIONFS_INTERNAL_DEBUG("unionfs_setlabel: leave (%d)\n", error);
return (error);
}
static int
unionfs_vptofh(struct vop_vptofh_args *ap)
{
return (EOPNOTSUPP);
}
static int
unionfs_add_writecount(struct vop_add_writecount_args *ap)
{
struct vnode *tvp, *vp;
struct unionfs_node *unp;
int error;
vp = ap->a_vp;
unp = VTOUNIONFS(vp);
tvp = unp->un_uppervp != NULL ? unp->un_uppervp : unp->un_lowervp;
VI_LOCK(vp);
/* text refs are bypassed to lowervp */
VNASSERT(vp->v_writecount >= 0, vp, ("wrong null writecount"));
VNASSERT(vp->v_writecount + ap->a_inc >= 0, vp,
("wrong writecount inc %d", ap->a_inc));
if (tvp != NULL)
error = VOP_ADD_WRITECOUNT(tvp, ap->a_inc);
else if (vp->v_writecount < 0)
error = ETXTBSY;
else
error = 0;
if (error == 0)
vp->v_writecount += ap->a_inc;
VI_UNLOCK(vp);
return (error);
}
struct vop_vector unionfs_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = unionfs_access,
.vop_aclcheck = unionfs_aclcheck,
.vop_advlock = unionfs_advlock,
.vop_bmap = VOP_EOPNOTSUPP,
.vop_cachedlookup = unionfs_lookup,
.vop_close = unionfs_close,
.vop_closeextattr = unionfs_closeextattr,
.vop_create = unionfs_create,
.vop_deleteextattr = unionfs_deleteextattr,
.vop_fsync = unionfs_fsync,
.vop_getacl = unionfs_getacl,
.vop_getattr = unionfs_getattr,
.vop_getextattr = unionfs_getextattr,
.vop_getwritemount = unionfs_getwritemount,
.vop_inactive = unionfs_inactive,
.vop_need_inactive = vop_stdneed_inactive,
.vop_islocked = unionfs_islocked,
.vop_ioctl = unionfs_ioctl,
.vop_link = unionfs_link,
.vop_listextattr = unionfs_listextattr,
.vop_lock1 = unionfs_lock,
.vop_lookup = vfs_cache_lookup,
.vop_mkdir = unionfs_mkdir,
.vop_mknod = unionfs_mknod,
.vop_open = unionfs_open,
.vop_openextattr = unionfs_openextattr,
.vop_pathconf = unionfs_pathconf,
.vop_poll = unionfs_poll,
.vop_print = unionfs_print,
.vop_read = unionfs_read,
.vop_readdir = unionfs_readdir,
.vop_readlink = unionfs_readlink,
.vop_reclaim = unionfs_reclaim,
.vop_remove = unionfs_remove,
.vop_rename = unionfs_rename,
.vop_rmdir = unionfs_rmdir,
.vop_setacl = unionfs_setacl,
.vop_setattr = unionfs_setattr,
.vop_setextattr = unionfs_setextattr,
.vop_setlabel = unionfs_setlabel,
.vop_strategy = unionfs_strategy,
.vop_symlink = unionfs_symlink,
.vop_unlock = unionfs_unlock,
.vop_whiteout = unionfs_whiteout,
.vop_write = unionfs_write,
.vop_vptofh = unionfs_vptofh,
.vop_add_writecount = unionfs_add_writecount,
};
VFS_VOP_VECTOR_REGISTER(unionfs_vnodeops);
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