File: [cvs.NetBSD.org] / src / sys / ufs / ufs / ufs_vnops.c (download)
Revision 1.156.2.1, Tue Nov 6 23:35:25 2007 UTC (16 years, 5 months ago) by matt
Branch: matt-armv6
CVS Tags: matt-armv6-prevmlocking
Changes since 1.156: +4 -4
lines
sync with HEAD
|
/* $NetBSD: ufs_vnops.c,v 1.156.2.1 2007/11/06 23:35:25 matt Exp $ */
/*
* 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 1.156.2.1 2007/11/06 23:35:25 matt Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#include "fs_lfs.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/malloc.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/kauth.h>
#include <sys/fstrans.h>
#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.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>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#include <ufs/ext2fs/ext2fs_extern.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/lfs/lfs_extern.h>
#include <uvm/uvm.h>
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 *);
/*
* A virgin directory (no blushing please).
*/
static const struct dirtemplate mastertemplate = {
0, 12, DT_DIR, 1, ".",
0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
/*
* Create a regular file
*/
int
ufs_create(void *v)
{
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
error =
ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
ap->a_dvp, ap->a_vpp, ap->a_cnp);
fstrans_done(ap->a_dvp->v_mount);
if (error)
return (error);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
int
ufs_mknod(void *v)
{
struct vop_mknod_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 mount *mp;
ino_t ino;
vap = ap->a_vap;
vpp = ap->a_vpp;
fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
if ((error =
ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp)) != 0)
goto out;
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
ip = VTOI(*vpp);
mp = (*vpp)->v_mount;
ino = ip->i_number;
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
if (vap->va_rdev != VNOVAL) {
struct ufsmount *ump = ip->i_ump;
/*
* Want to be able to use this to make badblock
* inodes, so don't truncate the dev number.
*/
if (ump->um_fstype == UFS1)
ip->i_ffs1_rdev = ufs_rw32(vap->va_rdev,
UFS_MPNEEDSWAP(ump));
else
ip->i_ffs2_rdev = ufs_rw64(vap->va_rdev,
UFS_MPNEEDSWAP(ump));
}
/*
* Remove inode so that it will be reloaded by VFS_VGET and
* checked to see if it is an alias of an existing entry in
* the inode cache.
*/
vput(*vpp);
(*vpp)->v_type = VNON;
vgone(*vpp);
error = VFS_VGET(mp, ino, vpp);
out:
fstrans_done(ap->a_dvp->v_mount);
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;
struct lwp *a_l;
} */ *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;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (vp->v_usecount > 1)
UFS_ITIMES(vp, NULL, NULL, NULL);
simple_unlock(&vp->v_interlock);
return (0);
}
int
ufs_access(void *v)
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
mode_t mode;
#ifdef QUOTA
int error;
#endif
vp = ap->a_vp;
ip = VTOI(vp);
mode = ap->a_mode;
/*
* 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 (mode & VWRITE) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
#ifdef QUOTA
fstrans_start(vp->v_mount, FSTRANS_SHARED);
error = getinoquota(ip);
fstrans_done(vp->v_mount);
if (error != 0)
return error;
#endif
break;
case VBAD:
case VBLK:
case VCHR:
case VSOCK:
case VFIFO:
case VNON:
default:
break;
}
}
/* If immutable bit set, nobody gets to write it. */
if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
return (EPERM);
return (vaccess(vp->v_type, ip->i_mode & ALLPERMS,
ip->i_uid, ip->i_gid, mode, ap->a_cred));
}
/* ARGSUSED */
int
ufs_getattr(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *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_ffs_effnlink;
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) {
vap->va_rdev = (dev_t)ufs_rw32(ip->i_ffs1_rdev,
UFS_MPNEEDSWAP(ip->i_ump));
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 {
vap->va_rdev = (dev_t)ufs_rw64(ip->i_ffs2_rdev,
UFS_MPNEEDSWAP(ip->i_ump));
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;
struct lwp *a_l;
} */ *ap = v;
struct vattr *vap;
struct vnode *vp;
struct inode *ip;
kauth_cred_t cred;
struct lwp *l;
int error;
vap = ap->a_vap;
vp = ap->a_vp;
ip = VTOI(vp);
cred = ap->a_cred;
l = ap->a_l;
/*
* 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);
}
fstrans_start(vp->v_mount, FSTRANS_SHARED);
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY) {
error = EROFS;
goto out;
}
if (kauth_cred_geteuid(cred) != ip->i_uid &&
(error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
NULL)))
goto out;
if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
NULL) == 0) {
if ((ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) &&
kauth_authorize_system(l->l_cred,
KAUTH_SYSTEM_CHSYSFLAGS, 0, NULL, NULL, NULL)) {
error = EPERM;
goto out;
}
/* Snapshot flag cannot be set or cleared */
if ((vap->va_flags & SF_SNAPSHOT) !=
(ip->i_flags & SF_SNAPSHOT)) {
error = EPERM;
goto out;
}
ip->i_flags = vap->va_flags;
DIP_ASSIGN(ip, flags, ip->i_flags);
} else {
if ((ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags) {
error = EPERM;
goto out;
}
if ((ip->i_flags & SF_SETTABLE) !=
(vap->va_flags & SF_SETTABLE)) {
error = EPERM;
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;
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_chown(vp, vap->va_uid, vap->va_gid, cred, l);
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(vp, vap->va_size, 0, cred, l);
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;
}
if (kauth_cred_geteuid(cred) != ip->i_uid &&
(error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
NULL)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, l))))
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 (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);
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_chmod(vp, (int)vap->va_mode, cred, l);
}
VN_KNOTE(vp, NOTE_ATTRIB);
out:
fstrans_done(vp->v_mount);
return (error);
}
/*
* 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, ismember = 0;
ip = VTOI(vp);
if (kauth_cred_geteuid(cred) != ip->i_uid &&
(error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL)))
return (error);
if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL)) {
if (vp->v_type != VDIR && (mode & S_ISTXT))
return (EFTYPE);
if ((kauth_cred_ismember_gid(cred, ip->i_gid, &ismember) != 0 ||
!ismember) && (mode & ISGID))
return (EPERM);
}
ip->i_mode &= ~ALLPERMS;
ip->i_mode |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
DIP_ASSIGN(ip, mode, ip->i_mode);
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, ismember = 0;
#ifdef QUOTA
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;
/*
* If we don't own the file, are trying to change the owner
* of the file, or are not a member of the target group,
* the caller's credentials must imply super-user privilege
* or the call fails.
*/
if ((kauth_cred_geteuid(cred) != ip->i_uid || uid != ip->i_uid ||
(gid != ip->i_gid &&
!(kauth_cred_getegid(cred) == gid ||
(kauth_cred_ismember_gid(cred, gid, &ismember) == 0 &&
ismember)))) &&
((error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
NULL)) != 0))
return (error);
#ifdef QUOTA
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);
#ifdef QUOTA
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 */
ip->i_flag |= IN_CHANGE;
return (0);
}
int
ufs_remove(void *v)
{
struct vop_remove_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp, *dvp;
struct inode *ip;
int error;
vp = ap->a_vp;
dvp = ap->a_dvp;
ip = VTOI(vp);
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
if (vp->v_type == VDIR || (ip->i_flags & (IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_flags & APPEND))
error = EPERM;
else
error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
fstrans_done(dvp->v_mount);
return (error);
}
/*
* link vnode call
*/
int
ufs_link(void *v)
{
struct vop_link_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp, *dvp;
struct componentname *cnp;
struct inode *ip;
struct direct *newdir;
int error;
dvp = ap->a_dvp;
vp = ap->a_vp;
cnp = ap->a_cnp;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_link: no name");
#endif
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
if (vp->v_type == VDIR) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out2;
}
if (dvp->v_mount != vp->v_mount) {
VOP_ABORTOP(dvp, cnp);
error = EXDEV;
goto out2;
}
if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) {
VOP_ABORTOP(dvp, cnp);
goto out2;
}
ip = VTOI(vp);
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
VOP_ABORTOP(dvp, cnp);
error = EMLINK;
goto out1;
}
if (ip->i_flags & (IMMUTABLE | APPEND)) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out1;
}
ip->i_ffs_effnlink++;
ip->i_nlink++;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip);
error = UFS_UPDATE(vp, NULL, NULL, UPDATE_DIROP);
if (!error) {
newdir = pool_get(&ufs_direct_pool, PR_WAITOK);
ufs_makedirentry(ip, cnp, newdir);
error = ufs_direnter(dvp, vp, newdir, cnp, NULL);
pool_put(&ufs_direct_pool, newdir);
}
if (error) {
ip->i_ffs_effnlink--;
ip->i_nlink--;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip);
}
PNBUF_PUT(cnp->cn_pnbuf);
out1:
if (dvp != vp)
VOP_UNLOCK(vp, 0);
out2:
VN_KNOTE(vp, NOTE_LINK);
VN_KNOTE(dvp, NOTE_WRITE);
vput(dvp);
fstrans_done(dvp->v_mount);
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);
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 */
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & SAVENAME) == 0)
panic("ufs_whiteout: missing name");
if (ump->um_maxsymlinklen <= 0)
panic("ufs_whiteout: old format filesystem");
#endif
newdir = pool_get(&ufs_direct_pool, PR_WAITOK);
newdir->d_ino = WINO;
newdir->d_namlen = cnp->cn_namelen;
memcpy(newdir->d_name, cnp->cn_nameptr,
(size_t)cnp->cn_namelen);
newdir->d_name[cnp->cn_namelen] = '\0';
newdir->d_type = DT_WHT;
error = ufs_direnter(dvp, NULL, newdir, cnp, NULL);
pool_put(&ufs_direct_pool, newdir);
break;
case DELETE:
/* remove an existing directory whiteout */
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
#ifdef DIAGNOSTIC
if (ump->um_maxsymlinklen <= 0)
panic("ufs_whiteout: old format filesystem");
#endif
cnp->cn_flags &= ~DOWHITEOUT;
error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
break;
default:
panic("ufs_whiteout: unknown op");
/* NOTREACHED */
}
if (cnp->cn_flags & HASBUF) {
PNBUF_PUT(cnp->cn_pnbuf);
cnp->cn_flags &= ~HASBUF;
}
fstrans_done(dvp->v_mount);
return (error);
}
/*
* Rename system call.
* rename("foo", "bar");
* is essentially
* unlink("bar");
* link("foo", "bar");
* unlink("foo");
* but ``atomically''. Can't do full commit without saving state in the
* inode on disk which isn't feasible at this time. Best we can do is
* always guarantee the target exists.
*
* Basic algorithm is:
*
* 1) Bump link count on source while we're linking it to the
* target. This also ensure the inode won't be deleted out
* from underneath us while we work (it may be truncated by
* a concurrent `trunc' or `open' for creation).
* 2) Link source to destination. If destination already exists,
* delete it first.
* 3) Unlink source reference to inode if still around. If a
* directory was moved and the parent of the destination
* is different from the source, patch the ".." entry in the
* directory.
*/
int
ufs_rename(void *v)
{
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 = v;
struct vnode *tvp, *tdvp, *fvp, *fdvp;
struct componentname *tcnp, *fcnp;
struct inode *ip, *xp, *dp;
struct mount *mp;
struct direct *newdir;
int doingdirectory, oldparent, newparent, error;
tvp = ap->a_tvp;
tdvp = ap->a_tdvp;
fvp = ap->a_fvp;
fdvp = ap->a_fdvp;
tcnp = ap->a_tcnp;
fcnp = ap->a_fcnp;
doingdirectory = oldparent = newparent = error = 0;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ufs_rename: no name");
#endif
/*
* Check for cross-device rename.
*/
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
abortit:
VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Check if just deleting a link name.
*/
if (tvp && ((VTOI(tvp)->i_flags & (IMMUTABLE | APPEND)) ||
(VTOI(tdvp)->i_flags & APPEND))) {
error = EPERM;
goto abortit;
}
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
error = EINVAL;
goto abortit;
}
/* Release destination completely. */
VOP_ABORTOP(tdvp, tcnp);
vput(tdvp);
vput(tvp);
/* Delete source. */
vrele(fvp);
fcnp->cn_flags &= ~(MODMASK | SAVESTART);
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
fcnp->cn_nameiop = DELETE;
vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = relookup(fdvp, &fvp, fcnp))) {
vput(fdvp);
return (error);
}
return (VOP_REMOVE(fdvp, fvp, fcnp));
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
if ((nlink_t) ip->i_nlink >= LINK_MAX) {
VOP_UNLOCK(fvp, 0);
error = EMLINK;
goto abortit;
}
if ((ip->i_flags & (IMMUTABLE | APPEND)) ||
(dp->i_flags & APPEND)) {
VOP_UNLOCK(fvp, 0);
error = EPERM;
goto abortit;
}
if ((ip->i_mode & IFMT) == IFDIR) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
dp == ip ||
(fcnp->cn_flags & ISDOTDOT) ||
(tcnp->cn_flags & ISDOTDOT) ||
(ip->i_flag & IN_RENAME)) {
VOP_UNLOCK(fvp, 0);
error = EINVAL;
goto abortit;
}
ip->i_flag |= IN_RENAME;
oldparent = dp->i_number;
doingdirectory = 1;
}
VN_KNOTE(fdvp, NOTE_WRITE); /* XXXLUKEM/XXX: right place? */
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
mp = fdvp->v_mount;
fstrans_start(mp, FSTRANS_SHARED);
/*
* 1) Bump link count while we're moving stuff
* around. If we crash somewhere before
* completing our work, the link count
* may be wrong, but correctable.
*/
ip->i_ffs_effnlink++;
ip->i_nlink++;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip);
if ((error = UFS_UPDATE(fvp, NULL, NULL, UPDATE_DIROP)) != 0) {
VOP_UNLOCK(fvp, 0);
goto bad;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory hierarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..". We must repeat the call
* to namei, as the parent directory is unlocked by the
* call to checkpath().
*/
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_lwp);
VOP_UNLOCK(fvp, 0);
if (oldparent != dp->i_number)
newparent = dp->i_number;
if (doingdirectory && newparent) {
if (error) /* write access check above */
goto bad;
if (xp != NULL)
vput(tvp);
vref(tdvp); /* compensate for the ref checkpath loses */
if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0) {
vrele(tdvp);
goto out;
}
tcnp->cn_flags &= ~SAVESTART;
vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
error = relookup(tdvp, &tvp, tcnp);
if (error != 0) {
vput(tdvp);
goto out;
}
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
}
/*
* 2) If target doesn't exist, link the target
* to the source and unlink the source.
* Otherwise, rewrite the target directory
* entry to reference the source inode and
* expunge the original entry's existence.
*/
if (xp == NULL) {
if (dp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't fool with the link count.
*/
if (doingdirectory && newparent) {
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_ffs_effnlink++;
dp->i_nlink++;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
if ((error = UFS_UPDATE(tdvp, NULL, NULL,
UPDATE_DIROP)) != 0) {
dp->i_ffs_effnlink--;
dp->i_nlink--;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
goto bad;
}
}
newdir = pool_get(&ufs_direct_pool, PR_WAITOK);
ufs_makedirentry(ip, tcnp, newdir);
error = ufs_direnter(tdvp, NULL, newdir, tcnp, NULL);
pool_put(&ufs_direct_pool, newdir);
if (error != 0) {
if (doingdirectory && newparent) {
dp->i_ffs_effnlink--;
dp->i_nlink--;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
(void)UFS_UPDATE(tdvp, NULL, NULL,
UPDATE_WAIT|UPDATE_DIROP);
}
goto bad;
}
VN_KNOTE(tdvp, NOTE_WRITE);
vput(tdvp);
} else {
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (xp->i_number == ip->i_number)
panic("rename: same file");
/*
* If the parent directory is "sticky", then the user must
* own the parent directory, or the destination of the rename,
* otherwise the destination may not be changed (except by
* root). This implements append-only directories.
*/
if ((dp->i_mode & S_ISTXT) &&
kauth_authorize_generic(tcnp->cn_cred,
KAUTH_GENERIC_ISSUSER, NULL) != 0 &&
kauth_cred_geteuid(tcnp->cn_cred) != dp->i_uid &&
xp->i_uid != kauth_cred_geteuid(tcnp->cn_cred)) {
error = EPERM;
goto bad;
}
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if ((xp->i_mode & IFMT) == IFDIR) {
if (xp->i_ffs_effnlink > 2 ||
!ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
if ((error = ufs_dirrewrite(dp, xp, ip->i_number,
IFTODT(ip->i_mode), doingdirectory && newparent ?
newparent : doingdirectory, IN_CHANGE | IN_UPDATE)) != 0)
goto bad;
if (doingdirectory) {
if (!newparent) {
dp->i_ffs_effnlink--;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
}
xp->i_ffs_effnlink--;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(xp);
}
if (doingdirectory && !DOINGSOFTDEP(tvp)) {
/*
* Truncate inode. The only stuff left in the directory
* is "." and "..". The "." reference is inconsequential
* since we are quashing it. We have removed the "."
* reference and the reference in the parent directory,
* but there may be other hard links. The soft
* dependency code will arrange to do these operations
* after the parent directory entry has been deleted on
* disk, so when running with that code we avoid doing
* them now.
*/
if (!newparent) {
dp->i_nlink--;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
}
xp->i_nlink--;
DIP_ASSIGN(xp, nlink, xp->i_nlink);
xp->i_flag |= IN_CHANGE;
if ((error = UFS_TRUNCATE(tvp, (off_t)0, IO_SYNC,
tcnp->cn_cred, tcnp->cn_lwp)))
goto bad;
}
VN_KNOTE(tdvp, NOTE_WRITE);
vput(tdvp);
VN_KNOTE(tvp, NOTE_DELETE);
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~(MODMASK | SAVESTART);
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = relookup(fdvp, &fvp, fcnp))) {
vput(fdvp);
vrele(ap->a_fvp);
goto out2;
}
if (fvp != NULL) {
xp = VTOI(fvp);
dp = VTOI(fdvp);
} else {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("rename: lost dir entry");
vrele(ap->a_fvp);
error = 0;
goto out2;
}
/*
* Ensure that the directory entry still exists and has not
* changed while the new name has been entered. If the source is
* a file then the entry may have been unlinked or renamed. In
* either case there is no further work to be done. If the source
* is a directory then it cannot have been rmdir'ed; The IRENAME
* flag ensures that it cannot be moved by another rename or removed
* by a rmdir.
*/
if (xp != ip) {
if (doingdirectory)
panic("rename: lost dir entry");
} else {
/*
* If the source is a directory with a
* new parent, the link count of the old
* parent directory must be decremented
* and ".." set to point to the new parent.
*/
if (doingdirectory && newparent) {
KASSERT(dp != NULL);
xp->i_offset = mastertemplate.dot_reclen;
ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0, IN_CHANGE);
cache_purge(fdvp);
}
error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
xp->i_flag &= ~IN_RENAME;
}
VN_KNOTE(fvp, NOTE_RENAME);
if (dp)
vput(fdvp);
if (xp)
vput(fvp);
vrele(ap->a_fvp);
goto out2;
/* exit routines from steps 1 & 2 */
bad:
if (xp)
vput(ITOV(xp));
vput(ITOV(dp));
out:
if (doingdirectory)
ip->i_flag &= ~IN_RENAME;
if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
ip->i_ffs_effnlink--;
ip->i_nlink--;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
ip->i_flag &= ~IN_RENAME;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip);
vput(fvp);
} else
vrele(fvp);
vrele(fdvp);
/* exit routines from step 3 */
out2:
fstrans_done(mp);
return (error);
}
/*
* Mkdir system call
*/
int
ufs_mkdir(void *v)
{
struct vop_mkdir_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp, *tvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct inode *ip, *dp = VTOI(dvp);
struct buf *bp;
struct dirtemplate dirtemplate;
struct direct *newdir;
int error, dmode, blkoff;
struct ufsmount *ump = dp->i_ump;
int dirblksiz = ump->um_dirblksiz;
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_mkdir: no name");
#endif
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
dmode = vap->va_mode & ACCESSPERMS;
dmode |= IFDIR;
/*
* Must simulate part of ufs_makeinode here to acquire the inode,
* but not have it entered in the parent directory. The entry is
* made later after writing "." and ".." entries.
*/
if ((error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, ap->a_vpp)) != 0)
goto out;
tvp = *ap->a_vpp;
ip = VTOI(tvp);
ip->i_uid = kauth_cred_geteuid(cnp->cn_cred);
DIP_ASSIGN(ip, uid, ip->i_uid);
ip->i_gid = dp->i_gid;
DIP_ASSIGN(ip, gid, ip->i_gid);
#ifdef QUOTA
if ((error = chkiq(ip, 1, cnp->cn_cred, 0))) {
PNBUF_PUT(cnp->cn_pnbuf);
UFS_VFREE(tvp, ip->i_number, dmode);
fstrans_done(dvp->v_mount);
vput(tvp);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = dmode;
DIP_ASSIGN(ip, mode, dmode);
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_ffs_effnlink = 2;
ip->i_nlink = 2;
DIP_ASSIGN(ip, nlink, 2);
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
if (cnp->cn_flags & ISWHITEOUT) {
ip->i_flags |= UF_OPAQUE;
DIP_ASSIGN(ip, flags, ip->i_flags);
}
/*
* Bump link count in parent directory to reflect work done below.
* Should be done before reference is created so cleanup is
* possible if we crash.
*/
dp->i_ffs_effnlink++;
dp->i_nlink++;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp);
if ((error = UFS_UPDATE(dvp, NULL, NULL, UPDATE_DIROP)) != 0)
goto bad;
/*
* Initialize directory with "." and ".." from static template.
*/
dirtemplate = mastertemplate;
dirtemplate.dotdot_reclen = dirblksiz - dirtemplate.dot_reclen;
dirtemplate.dot_ino = ufs_rw32(ip->i_number, UFS_MPNEEDSWAP(ump));
dirtemplate.dotdot_ino = ufs_rw32(dp->i_number, UFS_MPNEEDSWAP(ump));
dirtemplate.dot_reclen = ufs_rw16(dirtemplate.dot_reclen,
UFS_MPNEEDSWAP(ump));
dirtemplate.dotdot_reclen = ufs_rw16(dirtemplate.dotdot_reclen,
UFS_MPNEEDSWAP(ump));
if (ump->um_maxsymlinklen <= 0) {
#if BYTE_ORDER == LITTLE_ENDIAN
if (UFS_MPNEEDSWAP(ump) == 0)
#else
if (UFS_MPNEEDSWAP(ump) != 0)
#endif
{
dirtemplate.dot_type = dirtemplate.dot_namlen;
dirtemplate.dotdot_type = dirtemplate.dotdot_namlen;
dirtemplate.dot_namlen = dirtemplate.dotdot_namlen = 0;
} else
dirtemplate.dot_type = dirtemplate.dotdot_type = 0;
}
if ((error = UFS_BALLOC(tvp, (off_t)0, dirblksiz, cnp->cn_cred,
B_CLRBUF, &bp)) != 0)
goto bad;
ip->i_size = dirblksiz;
DIP_ASSIGN(ip, size, dirblksiz);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
uvm_vnp_setsize(tvp, ip->i_size);
memcpy((void *)bp->b_data, (void *)&dirtemplate, sizeof dirtemplate);
if (DOINGSOFTDEP(tvp)) {
/*
* Ensure that the entire newly allocated block is a
* valid directory so that future growth within the
* block does not have to ensure that the block is
* written before the inode.
*/
blkoff = dirblksiz;
while (blkoff < bp->b_bcount) {
((struct direct *)
((char *)bp->b_data + blkoff))->d_reclen = dirblksiz;
blkoff += dirblksiz;
}
}
/*
* Directory set up, now install it's entry in the parent directory.
*
* If we are not doing soft dependencies, then we must write out the
* buffer containing the new directory body before entering the new
* name in the parent. If we are doing soft dependencies, then the
* buffer containing the new directory body will be passed to and
* released in the soft dependency code after the code has attached
* an appropriate ordering dependency to the buffer which ensures that
* the buffer is written before the new name is written in the parent.
*/
if (!DOINGSOFTDEP(tvp) && ((error = VOP_BWRITE(bp)) != 0))
goto bad;
if ((error = UFS_UPDATE(tvp, NULL, NULL, UPDATE_DIROP)) != 0) {
if (DOINGSOFTDEP(tvp))
(void)VOP_BWRITE(bp);
goto bad;
}
newdir = pool_get(&ufs_direct_pool, PR_WAITOK);
ufs_makedirentry(ip, cnp, newdir);
error = ufs_direnter(dvp, tvp, newdir, cnp, bp);
pool_put(&ufs_direct_pool, newdir);
bad:
if (error == 0) {
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
} else {
dp->i_ffs_effnlink--;
dp->i_nlink--;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp);
/*
* No need to do an explicit UFS_TRUNCATE here, vrele will
* do this for us because we set the link count to 0.
*/
ip->i_ffs_effnlink = 0;
ip->i_nlink = 0;
DIP_ASSIGN(ip, nlink, 0);
ip->i_flag |= IN_CHANGE;
#ifdef LFS
/* If IN_ADIROP, account for it */
lfs_unmark_vnode(tvp);
#endif
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
vput(tvp);
}
out:
PNBUF_PUT(cnp->cn_pnbuf);
fstrans_done(dvp->v_mount);
vput(dvp);
return (error);
}
/*
* Rmdir system call.
*/
int
ufs_rmdir(void *v)
{
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp, *dvp;
struct componentname *cnp;
struct inode *ip, *dp;
int error;
vp = ap->a_vp;
dvp = ap->a_dvp;
cnp = ap->a_cnp;
ip = VTOI(vp);
dp = VTOI(dvp);
/*
* No rmdir "." or of mounted directories please.
*/
if (dp == ip || vp->v_mountedhere != NULL) {
if (dp == ip)
vrele(vp);
else
vput(vp);
vput(vp);
return (EINVAL);
}
fstrans_start(dvp->v_mount, FSTRANS_SHARED);
/*
* Do not remove a directory that is in the process of being renamed.
* Verify that the directory is empty (and valid). (Rmdir ".." won't
* be valid since ".." will contain a reference to the current
* directory and thus be non-empty.)
*/
error = 0;
if (ip->i_flag & IN_RENAME) {
error = EINVAL;
goto out;
}
if (ip->i_ffs_effnlink != 2 ||
!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
error = ENOTEMPTY;
goto out;
}
if ((dp->i_flags & APPEND) ||
(ip->i_flags & (IMMUTABLE | APPEND))) {
error = EPERM;
goto out;
}
/*
* Delete reference to directory before purging
* inode. If we crash in between, the directory
* will be reattached to lost+found,
*/
if (DOINGSOFTDEP(vp)) {
dp->i_ffs_effnlink--;
ip->i_ffs_effnlink--;
softdep_change_linkcnt(dp);
softdep_change_linkcnt(ip);
}
error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
if (error) {
if (DOINGSOFTDEP(vp)) {
dp->i_ffs_effnlink++;
ip->i_ffs_effnlink++;
softdep_change_linkcnt(dp);
softdep_change_linkcnt(ip);
}
goto out;
}
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
cache_purge(dvp);
/*
* Truncate inode. The only stuff left in the directory is "." and
* "..". The "." reference is inconsequential since we're quashing
* it. The soft dependency code will arrange to do these operations
* after the parent directory entry has been deleted on disk, so
* when running with that code we avoid doing them now.
*/
if (!DOINGSOFTDEP(vp)) {
dp->i_nlink--;
dp->i_ffs_effnlink--;
DIP_ASSIGN(dp, nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
ip->i_nlink--;
ip->i_ffs_effnlink--;
DIP_ASSIGN(ip, nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
error = UFS_TRUNCATE(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
cnp->cn_lwp);
}
cache_purge(vp);
#ifdef UFS_DIRHASH
if (ip->i_dirhash != NULL)
ufsdirhash_free(ip);
#endif
out:
VN_KNOTE(vp, NOTE_DELETE);
fstrans_done(dvp->v_mount);
vput(dvp);
vput(vp);
return (error);
}
/*
* symlink -- make a symbolic link
*/
int
ufs_symlink(void *v)
{
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap = v;
struct vnode *vp, **vpp;
struct inode *ip;
int len, error;
vpp = ap->a_vpp;
fstrans_start(ap->a_dvp->v_mount, FSTRANS_SHARED);
error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp);
if (error)
goto out;
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
vp = *vpp;
len = strlen(ap->a_target);
ip = VTOI(vp);
if (len < ip->i_ump->um_maxsymlinklen) {
memcpy((char *)SHORTLINK(ip), ap->a_target, len);
ip->i_size = len;
DIP_ASSIGN(ip, size, len);
uvm_vnp_setsize(vp, ip->i_size);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
} else
error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, NULL,
NULL);
if (error)
vput(vp);
out:
fstrans_done(ap->a_dvp->v_mount);
return (error);
}
/*
* Vnode op for reading directories.
*
* This routine handles converting from the on-disk directory format
* "struct direct" to the in-memory format "struct dirent" as well as
* byte swapping the entries if necessary.
*/
int
ufs_readdir(void *v)
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
int *a_eofflag;
off_t **a_cookies;
int *ncookies;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct direct *cdp, *ecdp;
struct dirent *ndp;
char *cdbuf, *ndbuf, *endp;
struct uio auio, *uio;
struct iovec aiov;
int error;
size_t count, ccount, rcount;
off_t off, *ccp;
off_t startoff;
size_t skipbytes;
struct ufsmount *ump = VFSTOUFS(vp->v_mount);
int nswap = UFS_MPNEEDSWAP(ump);
#if BYTE_ORDER == LITTLE_ENDIAN
int needswap = ump->um_maxsymlinklen <= 0 && nswap == 0;
#else
int needswap = ump->um_maxsymlinklen <= 0 && nswap != 0;
#endif
uio = ap->a_uio;
count = uio->uio_resid;
rcount = count - ((uio->uio_offset + count) & (ump->um_dirblksiz - 1));
if (rcount < _DIRENT_MINSIZE(cdp) || count < _DIRENT_MINSIZE(ndp))
return EINVAL;
startoff = uio->uio_offset & ~(ump->um_dirblksiz - 1);
skipbytes = uio->uio_offset - startoff;
rcount += skipbytes;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = startoff;
auio.uio_resid = rcount;
UIO_SETUP_SYSSPACE(&auio);
auio.uio_rw = UIO_READ;
cdbuf = malloc(rcount, M_TEMP, M_WAITOK);
aiov.iov_base = cdbuf;
aiov.iov_len = rcount;
error = VOP_READ(vp, &auio, 0, ap->a_cred);
if (error != 0) {
free(cdbuf, M_TEMP);
return error;
}
rcount -= auio.uio_resid;
cdp = (struct direct *)(void *)cdbuf;
ecdp = (struct direct *)(void *)&cdbuf[rcount];
ndbuf = malloc(count, M_TEMP, M_WAITOK);
ndp = (struct dirent *)(void *)ndbuf;
endp = &ndbuf[count];
off = uio->uio_offset;
if (ap->a_cookies) {
ccount = rcount / _DIRENT_RECLEN(cdp, 1);
ccp = *(ap->a_cookies) = malloc(ccount * sizeof(*ccp),
M_TEMP, M_WAITOK);
} else {
/* XXX: GCC */
ccount = 0;
ccp = NULL;
}
while (cdp < ecdp) {
cdp->d_reclen = ufs_rw16(cdp->d_reclen, nswap);
if (skipbytes > 0) {
if (cdp->d_reclen <= skipbytes) {
skipbytes -= cdp->d_reclen;
cdp = _DIRENT_NEXT(cdp);
continue;
}
/*
* invalid cookie.
*/
error = EINVAL;
goto out;
}
if (cdp->d_reclen == 0) {
struct dirent *ondp = ndp;
ndp->d_reclen = _DIRENT_MINSIZE(ndp);
ndp = _DIRENT_NEXT(ndp);
ondp->d_reclen = 0;
cdp = ecdp;
break;
}
if (needswap) {
ndp->d_type = cdp->d_namlen;
ndp->d_namlen = cdp->d_type;
} else {
ndp->d_type = cdp->d_type;
ndp->d_namlen = cdp->d_namlen;
}
ndp->d_reclen = _DIRENT_RECLEN(ndp, ndp->d_namlen);
if ((char *)(void *)ndp + ndp->d_reclen +
_DIRENT_MINSIZE(ndp) > endp)
break;
ndp->d_fileno = ufs_rw32(cdp->d_ino, nswap);
(void)memcpy(ndp->d_name, cdp->d_name, ndp->d_namlen);
memset(&ndp->d_name[ndp->d_namlen], 0,
ndp->d_reclen - _DIRENT_NAMEOFF(ndp) - ndp->d_namlen);
off += cdp->d_reclen;
if (ap->a_cookies) {
KASSERT(ccp - *(ap->a_cookies) < ccount);
*(ccp++) = off;
}
ndp = _DIRENT_NEXT(ndp);
cdp = _DIRENT_NEXT(cdp);
}
count = ((char *)(void *)ndp - ndbuf);
error = uiomove(ndbuf, count, uio);
out:
if (ap->a_cookies) {
if (error) {
free(*(ap->a_cookies), M_TEMP);
*(ap->a_cookies) = NULL;
*(ap->a_ncookies) = 0;
} else {
*ap->a_ncookies = ccp - *(ap->a_cookies);
}
}
uio->uio_offset = off;
free(ndbuf, M_TEMP);
free(cdbuf, M_TEMP);
*ap->a_eofflag = VTOI(vp)->i_size <= uio->uio_offset;
return error;
}
/*
* Return target name of a symbolic link
*/
int
ufs_readlink(void *v)
{
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ufsmount *ump = VFSTOUFS(vp->v_mount);
int isize;
isize = ip->i_size;
if (isize < ump->um_maxsymlinklen ||
(ump->um_maxsymlinklen == 0 && DIP(ip, blocks) == 0)) {
uiomove((char *)SHORTLINK(ip), isize, ap->a_uio);
return (0);
}
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
ufs_strategy(void *v)
{
struct vop_strategy_args /* {
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap = v;
struct buf *bp;
struct vnode *vp;
struct inode *ip;
int error;
bp = ap->a_bp;
vp = ap->a_vp;
ip = VTOI(vp);
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("ufs_strategy: spec");
KASSERT(bp->b_bcount != 0);
if (bp->b_blkno == bp->b_lblkno) {
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
NULL);
if (error) {
bp->b_error = error;
biodone(bp);
return (error);
}
if (bp->b_blkno == -1) /* no valid data */
clrbuf(bp);
}
if (bp->b_blkno < 0) { /* block is not on disk */
biodone(bp);
return (0);
}
vp = ip->i_devvp;
return (VOP_STRATEGY(vp, bp));
}
/*
* Print out the contents of an inode.
*/
int
ufs_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
vp = ap->a_vp;
ip = VTOI(vp);
printf("tag VT_UFS, ino %llu, on dev %d, %d",
(unsigned long long)ip->i_number,
major(ip->i_dev), minor(ip->i_dev));
printf(" flags 0x%x, effnlink %d, nlink %d\n",
ip->i_flag, ip->i_ffs_effnlink, ip->i_nlink);
printf("\tmode 0%o, owner %d, group %d, size %qd",
ip->i_mode, ip->i_uid, ip->i_gid,
(long long)ip->i_size);
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
lockmgr_printinfo(&vp->v_lock);
printf("\n");
return (0);
}
/*
* Read wrapper for special devices.
*/
int
ufsspec_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Set access flag.
*/
if ((ap->a_vp->v_mount->mnt_flag & MNT_NODEVMTIME) == 0)
VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for special devices.
*/
int
ufsspec_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Set update and change flags.
*/
if ((ap->a_vp->v_mount->mnt_flag & MNT_NODEVMTIME) == 0)
VTOI(ap->a_vp)->i_flag |= IN_MODIFY;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for special devices.
*
* Update the times on the inode then do device close.
*/
int
ufsspec_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (vp->v_usecount > 1)
UFS_ITIMES(vp, NULL, NULL, NULL);
simple_unlock(&vp->v_interlock);
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
}
/*
* Read wrapper for fifo's
*/
int
ufsfifo_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Set access flag.
*/
VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for fifo's.
*/
int
ufsfifo_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IN_MODIFY;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for fifo's.
*
* Update the times on the inode then do device close.
*/
int
ufsfifo_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (ap->a_vp->v_usecount > 1)
UFS_ITIMES(vp, NULL, NULL, NULL);
simple_unlock(&vp->v_interlock);
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
}
/*
* Return POSIX pathconf information applicable to ufs filesystems.
*/
int
ufs_pathconf(void *v)
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
case _PC_SYNC_IO:
*ap->a_retval = 1;
return (0);
case _PC_FILESIZEBITS:
*ap->a_retval = 42;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Advisory record locking support
*/
int
ufs_advlock(void *v)
{
struct vop_advlock_args /* {
struct vnode *a_vp;
void * a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap = v;
struct inode *ip;
ip = VTOI(ap->a_vp);
return lf_advlock(ap, &ip->i_lockf, ip->i_size);
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
void
ufs_vinit(struct mount *mntp, int (**specops)(void *), int (**fifoops)(void *),
struct vnode **vpp)
{
struct timeval tv;
struct inode *ip;
struct vnode *vp, *nvp;
dev_t rdev;
struct ufsmount *ump;
vp = *vpp;
ip = VTOI(vp);
switch(vp->v_type = IFTOVT(ip->i_mode)) {
case VCHR:
case VBLK:
vp->v_op = specops;
ump = ip->i_ump;
if (ump->um_fstype == UFS1)
rdev = (dev_t)ufs_rw32(ip->i_ffs1_rdev,
UFS_MPNEEDSWAP(ump));
else
rdev = (dev_t)ufs_rw64(ip->i_ffs2_rdev,
UFS_MPNEEDSWAP(ump));
if ((nvp = checkalias(vp, rdev, mntp)) != NULL) {
/*
* Discard unneeded vnode, but save its inode.
*/
nvp->v_data = vp->v_data;
vp->v_data = NULL;
/* XXX spec_vnodeops has no locking, do it explicitly */
vp->v_vflag &= ~VV_LOCKSWORK;
VOP_UNLOCK(vp, 0);
vp->v_op = spec_vnodeop_p;
vrele(vp);
vgone(vp);
lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock);
/*
* Reinitialize aliased inode.
*/
vp = nvp;
ip->i_vnode = vp;
}
break;
case VFIFO:
vp->v_op = fifoops;
break;
case VNON:
case VBAD:
case VSOCK:
case VLNK:
case VDIR:
case VREG:
break;
}
if (ip->i_number == ROOTINO)
vp->v_vflag |= VV_ROOT;
/*
* Initialize modrev times
*/
getmicrouptime(&tv);
ip->i_modrev = (uint64_t)(uint)tv.tv_sec << 32
| tv.tv_usec * 4294u;
*vpp = vp;
}
/*
* Allocate a new inode.
*/
int
ufs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
struct componentname *cnp)
{
struct inode *ip, *pdir;
struct direct *newdir;
struct vnode *tvp;
int error, ismember = 0;
pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_makeinode: no name");
#endif
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((error = UFS_VALLOC(dvp, mode, cnp->cn_cred, vpp)) != 0) {
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
return (error);
}
tvp = *vpp;
ip = VTOI(tvp);
ip->i_gid = pdir->i_gid;
DIP_ASSIGN(ip, gid, ip->i_gid);
ip->i_uid = kauth_cred_geteuid(cnp->cn_cred);
DIP_ASSIGN(ip, uid, ip->i_uid);
#ifdef QUOTA
if ((error = chkiq(ip, 1, cnp->cn_cred, 0))) {
UFS_VFREE(tvp, ip->i_number, mode);
vput(tvp);
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = mode;
DIP_ASSIGN(ip, mode, mode);
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_ffs_effnlink = 1;
ip->i_nlink = 1;
DIP_ASSIGN(ip, nlink, 1);
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
if ((ip->i_mode & ISGID) && (kauth_cred_ismember_gid(cnp->cn_cred,
ip->i_gid, &ismember) != 0 || !ismember) &&
kauth_authorize_generic(cnp->cn_cred, KAUTH_GENERIC_ISSUSER, NULL)) {
ip->i_mode &= ~ISGID;
DIP_ASSIGN(ip, mode, ip->i_mode);
}
if (cnp->cn_flags & ISWHITEOUT) {
ip->i_flags |= UF_OPAQUE;
DIP_ASSIGN(ip, flags, ip->i_flags);
}
/*
* Make sure inode goes to disk before directory entry.
*/
if ((error = UFS_UPDATE(tvp, NULL, NULL, UPDATE_DIROP)) != 0)
goto bad;
newdir = pool_get(&ufs_direct_pool, PR_WAITOK);
ufs_makedirentry(ip, cnp, newdir);
error = ufs_direnter(dvp, tvp, newdir, cnp, NULL);
pool_put(&ufs_direct_pool, newdir);
if (error)
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
*vpp = tvp;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
ip->i_ffs_effnlink = 0;
ip->i_nlink = 0;
DIP_ASSIGN(ip, nlink, 0);
ip->i_flag |= IN_CHANGE;
#ifdef LFS
/* If IN_ADIROP, account for it */
lfs_unmark_vnode(tvp);
#endif
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
tvp->v_type = VNON; /* explodes later if VBLK */
vput(tvp);
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
return (error);
}
/*
* Allocate len bytes at offset off.
*/
int
ufs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
kauth_cred_t cred)
{
struct inode *ip = VTOI(vp);
int error, delta, bshift, bsize;
UVMHIST_FUNC("ufs_gop_alloc"); UVMHIST_CALLED(ubchist);
error = 0;
bshift = vp->v_mount->mnt_fs_bshift;
bsize = 1 << bshift;
delta = off & (bsize - 1);
off -= delta;
len += delta;
while (len > 0) {
bsize = MIN(bsize, len);
error = UFS_BALLOC(vp, off, bsize, cred, flags, NULL);
if (error) {
goto out;
}
/*
* increase file size now, UFS_BALLOC() requires that
* EOF be up-to-date before each call.
*/
if (ip->i_size < off + bsize) {
UVMHIST_LOG(ubchist, "vp %p old 0x%x new 0x%x",
vp, ip->i_size, off + bsize, 0);
ip->i_size = off + bsize;
DIP_ASSIGN(ip, size, ip->i_size);
}
off += bsize;
len -= bsize;
}
out:
return error;
}
void
ufs_gop_markupdate(struct vnode *vp, int flags)
{
u_int32_t mask = 0;
if ((flags & GOP_UPDATE_ACCESSED) != 0) {
mask = IN_ACCESS;
}
if ((flags & GOP_UPDATE_MODIFIED) != 0) {
if (vp->v_type == VREG) {
mask |= IN_CHANGE | IN_UPDATE;
} else {
mask |= IN_MODIFY;
}
}
if (mask) {
struct inode *ip = VTOI(vp);
ip->i_flag |= mask;
}
}
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