/
ufs_vnops.c
2423 lines (2216 loc) · 57.6 KB
/
ufs_vnops.c
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/* $NetBSD: ufs_vnops.c,v 1.262 2022/03/27 16:24:59 christos Exp $ */
/*-
* Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wasabi Systems, Inc.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1982, 1986, 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
*
* @(#)ufs_vnops.c 8.28 (Berkeley) 7/31/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ufs_vnops.c,v 1.262 2022/03/27 16:24:59 christos Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#include "opt_uvmhist.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/fstrans.h>
#include <sys/kmem.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/kauth.h>
#include <sys/wapbl.h>
#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.h>
#include <ufs/ufs/acl.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_wapbl.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#include <ufs/ext2fs/ext2fs_extern.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/lfs/lfs_extern.h>
#include <ufs/lfs/lfs.h>
#ifdef UVMHIST
#include <uvm/uvm.h>
#endif
#include <uvm/uvm_extern.h>
#include <uvm/uvm_stat.h>
__CTASSERT(EXT2FS_MAXNAMLEN == FFS_MAXNAMLEN);
__CTASSERT(LFS_MAXNAMLEN == FFS_MAXNAMLEN);
static int ufs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *);
static int ufs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t,
struct lwp *);
static int ufs_makeinode(struct vattr *, struct vnode *,
const struct ufs_lookup_results *, struct vnode **, struct componentname *);
/*
* A virgin directory (no blushing please).
*/
static const struct dirtemplate mastertemplate = {
0, 12, DT_DIR, 1, ".",
0, UFS_DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
/*
* Create a regular file
*/
int
ufs_create(void *v)
{
struct vop_create_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
struct vnode *dvp = ap->a_dvp;
struct ufs_lookup_results *ulr;
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
/*
* UFS_WAPBL_BEGIN(dvp->v_mount) performed by successful
* ufs_makeinode
*/
error = ufs_makeinode(ap->a_vap, dvp, ulr, ap->a_vpp, ap->a_cnp);
if (error) {
return (error);
}
UFS_WAPBL_END(dvp->v_mount);
VOP_UNLOCK(*ap->a_vpp);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
int
ufs_mknod(void *v)
{
struct vop_mknod_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vattr *vap;
struct vnode **vpp;
struct inode *ip;
int error;
struct ufs_lookup_results *ulr;
vap = ap->a_vap;
vpp = ap->a_vpp;
/* XXX should handle this material another way */
ulr = &VTOI(ap->a_dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(ap->a_dvp));
/*
* UFS_WAPBL_BEGIN(dvp->v_mount) performed by successful
* ufs_makeinode
*/
if ((error = ufs_makeinode(vap, ap->a_dvp, ulr, vpp, ap->a_cnp)) != 0)
goto out;
ip = VTOI(*vpp);
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
UFS_WAPBL_UPDATE(*vpp, NULL, NULL, 0);
UFS_WAPBL_END(ap->a_dvp->v_mount);
VOP_UNLOCK(*vpp);
out:
if (error != 0) {
*vpp = NULL;
return (error);
}
return (0);
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
int
ufs_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Files marked append-only must be opened for appending.
*/
if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
return (0);
}
/*
* Close called.
*
* Update the times on the inode.
*/
/* ARGSUSED */
int
ufs_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp;
vp = ap->a_vp;
if (vrefcnt(vp) > 1)
UFS_ITIMES(vp, NULL, NULL, NULL);
return (0);
}
static int
ufs_check_possible(struct vnode *vp, struct inode *ip, accmode_t accmode,
kauth_cred_t cred)
{
#if defined(QUOTA) || defined(QUOTA2)
int error;
#endif
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
if (accmode & VMODIFY_PERMS) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
#if defined(QUOTA) || defined(QUOTA2)
error = chkdq(ip, 0, cred, 0);
if (error != 0)
return error;
#endif
break;
case VBAD:
case VBLK:
case VCHR:
case VSOCK:
case VFIFO:
case VNON:
default:
break;
}
}
/* If it is a snapshot, nobody gets access to it. */
if ((ip->i_flags & SF_SNAPSHOT))
return EPERM;
/*
* If immutable bit set, nobody gets to write it. "& ~VADMIN_PERMS"
* permits the owner of the file to remove the IMMUTABLE flag.
*/
if ((accmode & (VMODIFY_PERMS & ~VADMIN_PERMS)) &&
(ip->i_flags & IMMUTABLE))
return EPERM;
return 0;
}
static int
ufs_check_permitted(struct vnode *vp, struct inode *ip,
struct acl *acl, accmode_t accmode, kauth_cred_t cred,
int (*func)(struct vnode *, kauth_cred_t, uid_t, gid_t, mode_t,
struct acl *, accmode_t))
{
return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(accmode,
vp->v_type, ip->i_mode & ALLPERMS), vp, NULL, (*func)(vp, cred,
ip->i_uid, ip->i_gid, ip->i_mode & ALLPERMS, acl, accmode));
}
int
ufs_accessx(void *v)
{
struct vop_accessx_args /* {
struct vnode *a_vp;
accmode_t a_accmode;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
accmode_t accmode = ap->a_accmode;
int error;
#ifdef UFS_ACL
struct acl *acl;
acl_type_t type;
#endif
error = ufs_check_possible(vp, ip, accmode, ap->a_cred);
if (error)
return error;
#ifdef UFS_ACL
if ((vp->v_mount->mnt_flag & (MNT_POSIX1EACLS | MNT_NFS4ACLS)) != 0) {
if (vp->v_mount->mnt_flag & MNT_NFS4ACLS)
type = ACL_TYPE_NFS4;
else
type = ACL_TYPE_ACCESS;
acl = acl_alloc(KM_SLEEP);
if (type == ACL_TYPE_NFS4)
error = ufs_getacl_nfs4_internal(vp, acl, curlwp);
else
error = VOP_GETACL(vp, type, acl, ap->a_cred);
if (!error) {
if (type == ACL_TYPE_NFS4) {
error = ufs_check_permitted(vp,
ip, acl, accmode, ap->a_cred,
genfs_can_access_acl_nfs4);
} else {
error = vfs_unixify_accmode(&accmode);
if (error == 0)
error = ufs_check_permitted(vp,
ip, acl, accmode, ap->a_cred,
genfs_can_access_acl_posix1e);
}
acl_free(acl);
return error;
}
if (error != EOPNOTSUPP)
printf("%s: Error retrieving ACL: %d\n",
__func__, error);
/*
* XXX: Fall back until debugged. Should
* eventually possibly log an error, and return
* EPERM for safety.
*/
acl_free(acl);
}
#endif /* !UFS_ACL */
error = vfs_unixify_accmode(&accmode);
if (error)
return error;
return ufs_check_permitted(vp, ip,
NULL, accmode, ap->a_cred, genfs_can_access);
}
/* ARGSUSED */
int
ufs_getattr(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
struct vattr *vap;
vp = ap->a_vp;
ip = VTOI(vp);
vap = ap->a_vap;
UFS_ITIMES(vp, NULL, NULL, NULL);
/*
* Copy from inode table
*/
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_mode & ALLPERMS;
vap->va_nlink = ip->i_nlink;
vap->va_uid = ip->i_uid;
vap->va_gid = ip->i_gid;
vap->va_size = vp->v_size;
if (ip->i_ump->um_fstype == UFS1) {
switch (vp->v_type) {
case VBLK:
case VCHR:
vap->va_rdev = (dev_t)ufs_rw32(ip->i_ffs1_rdev,
UFS_MPNEEDSWAP(ip->i_ump));
break;
default:
vap->va_rdev = NODEV;
break;
}
vap->va_atime.tv_sec = ip->i_ffs1_atime;
vap->va_atime.tv_nsec = ip->i_ffs1_atimensec;
vap->va_mtime.tv_sec = ip->i_ffs1_mtime;
vap->va_mtime.tv_nsec = ip->i_ffs1_mtimensec;
vap->va_ctime.tv_sec = ip->i_ffs1_ctime;
vap->va_ctime.tv_nsec = ip->i_ffs1_ctimensec;
vap->va_birthtime.tv_sec = 0;
vap->va_birthtime.tv_nsec = 0;
vap->va_bytes = dbtob((u_quad_t)ip->i_ffs1_blocks);
} else {
switch (vp->v_type) {
case VBLK:
case VCHR:
vap->va_rdev = (dev_t)ufs_rw64(ip->i_ffs2_rdev,
UFS_MPNEEDSWAP(ip->i_ump));
break;
default:
vap->va_rdev = NODEV;
break;
}
vap->va_atime.tv_sec = ip->i_ffs2_atime;
vap->va_atime.tv_nsec = ip->i_ffs2_atimensec;
vap->va_mtime.tv_sec = ip->i_ffs2_mtime;
vap->va_mtime.tv_nsec = ip->i_ffs2_mtimensec;
vap->va_ctime.tv_sec = ip->i_ffs2_ctime;
vap->va_ctime.tv_nsec = ip->i_ffs2_ctimensec;
vap->va_birthtime.tv_sec = ip->i_ffs2_birthtime;
vap->va_birthtime.tv_nsec = ip->i_ffs2_birthnsec;
vap->va_bytes = dbtob(ip->i_ffs2_blocks);
}
vap->va_gen = ip->i_gen;
vap->va_flags = ip->i_flags;
/* this doesn't belong here */
if (vp->v_type == VBLK)
vap->va_blocksize = BLKDEV_IOSIZE;
else if (vp->v_type == VCHR)
vap->va_blocksize = MAXBSIZE;
else
vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
vap->va_type = vp->v_type;
vap->va_filerev = ip->i_modrev;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ufs_setattr(void *v)
{
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
struct vattr *vap;
struct vnode *vp;
struct inode *ip;
kauth_cred_t cred;
struct lwp *l;
int error;
kauth_action_t action;
bool changing_sysflags;
vap = ap->a_vap;
vp = ap->a_vp;
ip = VTOI(vp);
cred = ap->a_cred;
l = curlwp;
action = KAUTH_VNODE_WRITE_FLAGS;
changing_sysflags = false;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
UFS_WAPBL_JUNLOCK_ASSERT(vp->v_mount);
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
/* Snapshot flag cannot be set or cleared */
if ((vap->va_flags & (SF_SNAPSHOT | SF_SNAPINVAL)) !=
(ip->i_flags & (SF_SNAPSHOT | SF_SNAPINVAL))) {
error = EPERM;
goto out;
}
if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
action |= KAUTH_VNODE_HAS_SYSFLAGS;
}
if ((vap->va_flags & SF_SETTABLE) !=
(ip->i_flags & SF_SETTABLE)) {
action |= KAUTH_VNODE_WRITE_SYSFLAGS;
changing_sysflags = true;
}
error = kauth_authorize_vnode(cred, action, vp, NULL,
genfs_can_chflags(vp, cred, ip->i_uid, changing_sysflags));
if (error)
goto out;
if (changing_sysflags) {
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
ip->i_flags = vap->va_flags;
DIP_ASSIGN(ip, flags, ip->i_flags);
} else {
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
ip->i_flags &= SF_SETTABLE;
ip->i_flags |= (vap->va_flags & UF_SETTABLE);
DIP_ASSIGN(ip, flags, ip->i_flags);
}
ip->i_flag |= IN_CHANGE;
UFS_WAPBL_UPDATE(vp, NULL, NULL, 0);
UFS_WAPBL_END(vp->v_mount);
if (vap->va_flags & (IMMUTABLE | APPEND)) {
error = 0;
goto out;
}
}
if (ip->i_flags & (IMMUTABLE | APPEND)) {
error = EPERM;
goto out;
}
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, l);
UFS_WAPBL_END(vp->v_mount);
if (error)
goto out;
}
if (vap->va_size != VNOVAL) {
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
switch (vp->v_type) {
case VDIR:
error = EISDIR;
goto out;
case VCHR:
case VBLK:
case VFIFO:
break;
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
if ((ip->i_flags & SF_SNAPSHOT) != 0) {
error = EPERM;
goto out;
}
error = ufs_truncate_retry(vp, 0, vap->va_size, cred);
if (error)
goto out;
break;
default:
error = EOPNOTSUPP;
goto out;
}
}
ip = VTOI(vp);
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL ||
vap->va_birthtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
if ((ip->i_flags & SF_SNAPSHOT) != 0) {
error = EPERM;
goto out;
}
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp,
NULL, genfs_can_chtimes(vp, cred, ip->i_uid,
vap->va_vaflags));
if (error)
goto out;
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
if (vap->va_atime.tv_sec != VNOVAL)
if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
ip->i_flag |= IN_ACCESS;
if (vap->va_mtime.tv_sec != VNOVAL) {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (vp->v_mount->mnt_flag & MNT_RELATIME)
ip->i_flag |= IN_ACCESS;
}
if (vap->va_birthtime.tv_sec != VNOVAL &&
ip->i_ump->um_fstype == UFS2) {
ip->i_ffs2_birthtime = vap->va_birthtime.tv_sec;
ip->i_ffs2_birthnsec = vap->va_birthtime.tv_nsec;
}
error = UFS_UPDATE(vp, &vap->va_atime, &vap->va_mtime, 0);
UFS_WAPBL_END(vp->v_mount);
if (error)
goto out;
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
if ((ip->i_flags & SF_SNAPSHOT) != 0 &&
(vap->va_mode & (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP |
S_IXOTH | S_IWOTH))) {
error = EPERM;
goto out;
}
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
error = ufs_chmod(vp, (int)vap->va_mode, cred, l);
UFS_WAPBL_END(vp->v_mount);
}
out:
cache_enter_id(vp, ip->i_mode, ip->i_uid, ip->i_gid, !HAS_ACLS(ip));
return (error);
}
#ifdef UFS_ACL
static int
ufs_update_nfs4_acl_after_mode_change(struct vnode *vp, int mode,
int file_owner_id, kauth_cred_t cred, struct lwp *l)
{
int error;
struct acl *aclp;
aclp = acl_alloc(KM_SLEEP);
error = ufs_getacl_nfs4_internal(vp, aclp, l);
/*
* We don't have to handle EOPNOTSUPP here, as the filesystem claims
* it supports ACLs.
*/
if (error)
goto out;
acl_nfs4_sync_acl_from_mode(aclp, mode, file_owner_id);
error = ufs_setacl_nfs4_internal(vp, aclp, l, false);
out:
acl_free(aclp);
return (error);
}
#endif /* UFS_ACL */
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ufs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l)
{
struct inode *ip;
int error;
UFS_WAPBL_JLOCK_ASSERT(vp->v_mount);
ip = VTOI(vp);
#ifdef UFS_ACL
/*
* To modify the permissions on a file, must possess VADMIN
* for that file.
*/
if ((error = VOP_ACCESSX(vp, VWRITE_ACL, cred)) != 0)
return error;
#endif
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, vp,
NULL, genfs_can_chmod(vp, cred, ip->i_uid, ip->i_gid, mode));
if (error)
return (error);
#ifdef UFS_ACL
if ((vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0) {
error = ufs_update_nfs4_acl_after_mode_change(vp, mode,
ip->i_uid, cred, l);
if (error)
return error;
}
#endif
ip->i_mode &= ~ALLPERMS;
ip->i_mode |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
DIP_ASSIGN(ip, mode, ip->i_mode);
UFS_WAPBL_UPDATE(vp, NULL, NULL, 0);
cache_enter_id(vp, ip->i_mode, ip->i_uid, ip->i_gid, !HAS_ACLS(ip));
return (0);
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
static int
ufs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred,
struct lwp *l)
{
struct inode *ip;
int error = 0;
#if defined(QUOTA) || defined(QUOTA2)
uid_t ouid;
gid_t ogid;
int64_t change;
#endif
ip = VTOI(vp);
error = 0;
if (uid == (uid_t)VNOVAL)
uid = ip->i_uid;
if (gid == (gid_t)VNOVAL)
gid = ip->i_gid;
#ifdef UFS_ACL
/*
* To modify the ownership of a file, must possess VADMIN for that
* file.
*/
if ((error = VOP_ACCESSX(vp, VWRITE_OWNER, cred)) != 0)
return error;
#endif
error = kauth_authorize_vnode(cred, KAUTH_VNODE_CHANGE_OWNERSHIP, vp,
NULL, genfs_can_chown(vp, cred, ip->i_uid, ip->i_gid, uid, gid));
if (error)
return (error);
#if defined(QUOTA) || defined(QUOTA2)
ogid = ip->i_gid;
ouid = ip->i_uid;
change = DIP(ip, blocks);
(void) chkdq(ip, -change, cred, 0);
(void) chkiq(ip, -1, cred, 0);
#endif
ip->i_gid = gid;
DIP_ASSIGN(ip, gid, gid);
ip->i_uid = uid;
DIP_ASSIGN(ip, uid, uid);
#if defined(QUOTA) || defined(QUOTA2)
if ((error = chkdq(ip, change, cred, 0)) == 0) {
if ((error = chkiq(ip, 1, cred, 0)) == 0)
goto good;
else
(void) chkdq(ip, -change, cred, FORCE);
}
ip->i_gid = ogid;
DIP_ASSIGN(ip, gid, ogid);
ip->i_uid = ouid;
DIP_ASSIGN(ip, uid, ouid);
(void) chkdq(ip, change, cred, FORCE);
(void) chkiq(ip, 1, cred, FORCE);
return (error);
good:
#endif /* QUOTA || QUOTA2 */
ip->i_flag |= IN_CHANGE;
UFS_WAPBL_UPDATE(vp, NULL, NULL, 0);
cache_enter_id(vp, ip->i_mode, ip->i_uid, ip->i_gid, !HAS_ACLS(ip));
return (0);
}
int
ufs_remove(void *v)
{
struct vop_remove_v3_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
nlink_t ctx_vp_new_nlink;
} */ *ap = v;
struct vnode *vp, *dvp;
struct inode *ip;
struct mount *mp;
int error;
struct ufs_lookup_results *ulr;
vp = ap->a_vp;
dvp = ap->a_dvp;
ip = VTOI(vp);
mp = dvp->v_mount;
KASSERT(mp == vp->v_mount); /* XXX Not stable without lock. */
#ifdef UFS_ACL
#ifdef notyet
/* We don't do this because if the filesystem is mounted without ACLs
* this goes through vfs_unixify_accmode() and we get EPERM.
*/
error = VOP_ACCESSX(vp, VDELETE, ap->a_cnp->cn_cred);
if (error)
goto err;
#endif
#endif
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
if (vp->v_type == VDIR || (ip->i_flags & (IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_flags & APPEND))
error = EPERM;
else {
error = UFS_WAPBL_BEGIN(mp);
if (error == 0) {
error = ufs_dirremove(dvp, ulr,
ip, ap->a_cnp->cn_flags, 0);
UFS_WAPBL_END(mp);
if (error == 0) {
ap->ctx_vp_new_nlink = ip->i_nlink;
}
}
}
#ifdef notyet
err:
#endif
if (dvp == vp)
vrele(vp);
else
vput(vp);
return (error);
}
/*
* ufs_link: create hard link.
*/
int
ufs_link(void *v)
{
struct vop_link_v2_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct componentname *cnp = ap->a_cnp;
struct mount *mp = dvp->v_mount;
struct inode *ip;
struct direct *newdir;
int error, abrt = 1;
struct ufs_lookup_results *ulr;
KASSERT(dvp != vp);
KASSERT(vp->v_type != VDIR);
KASSERT(mp == vp->v_mount); /* XXX Not stable without lock. */
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
error = vn_lock(vp, LK_EXCLUSIVE);
if (error)
goto out2;
ip = VTOI(vp);
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
error = EMLINK;
goto out1;
}
if (ip->i_flags & (IMMUTABLE | APPEND)) {
error = EPERM;
goto out1;
}
error = kauth_authorize_vnode(cnp->cn_cred, KAUTH_VNODE_ADD_LINK, vp,
dvp, 0);
if (error)
goto out1;
error = UFS_WAPBL_BEGIN(mp);
if (error)
goto out1;
ip->i_nlink++;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
abrt = 0;
error = UFS_UPDATE(vp, NULL, NULL, UPDATE_DIROP);
if (!error) {
newdir = pool_cache_get(ufs_direct_cache, PR_WAITOK);
ufs_makedirentry(ip, cnp, newdir);
error = ufs_direnter(dvp, ulr, vp, newdir, cnp, NULL);
pool_cache_put(ufs_direct_cache, newdir);
}
if (error) {
ip->i_nlink--;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
UFS_WAPBL_UPDATE(vp, NULL, NULL, UPDATE_DIROP);
}
UFS_WAPBL_END(mp);
out1:
VOP_UNLOCK(vp);
out2:
if (abrt)
VOP_ABORTOP(dvp, cnp);
return (error);
}
/*
* whiteout vnode call
*/
int
ufs_whiteout(void *v)
{
struct vop_whiteout_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
int a_flags;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct direct *newdir;
int error;
struct ufsmount *ump = VFSTOUFS(dvp->v_mount);
struct ufs_lookup_results *ulr;
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
error = 0;
switch (ap->a_flags) {
case LOOKUP:
/* 4.4 format directories support whiteout operations */
if (ump->um_maxsymlinklen > 0)
return (0);
return (EOPNOTSUPP);
case CREATE:
/* create a new directory whiteout */
error = UFS_WAPBL_BEGIN(dvp->v_mount);
if (error)
break;
KASSERTMSG((ump->um_maxsymlinklen > 0),
"ufs_whiteout: old format filesystem");
newdir = pool_cache_get(ufs_direct_cache, PR_WAITOK);
newdir->d_ino = UFS_WINO;
newdir->d_namlen = cnp->cn_namelen;
memcpy(newdir->d_name, cnp->cn_nameptr,
(size_t)cnp->cn_namelen);