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NetBSD/sys/ufs/ufs/ufs_vnops.c

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/* $NetBSD: ufs_vnops.c,v 1.79 2001/07/24 15:39:35 assar 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 "opt_quota.h"
#include "fs_lfs.h"
#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 <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.h>
#include <ufs/ufs/quota.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/ext2fs/ext2fs_extern.h>
#include <ufs/lfs/lfs_extern.h>
static int ufs_chmod(struct vnode *, int, struct ucred *, struct proc *);
static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *,
struct proc *);
union _qcvt {
int64_t qcvt;
int32_t val[2];
};
#define SETHIGH(q, h) \
do { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_HIGHWORD] = (h); \
(q) = tmp.qcvt; \
} while (0)
#define SETLOW(q, l) \
do { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_LOWWORD] = (l); \
(q) = tmp.qcvt; \
} while (0)
/*
* A virgin directory (no blushing please).
*/
static 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;
return
ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
ap->a_dvp, ap->a_vpp, ap->a_cnp);
}
/*
* 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;
if ((error =
ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp)) != 0)
return (error);
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) {
/*
* Want to be able to use this to make badblock
* inodes, so don't truncate the dev number.
*/
ip->i_ffs_rdev = ufs_rw32(vap->va_rdev,
UFS_MPNEEDSWAP(mp));
}
/*
* 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);
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;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
/*
* Files marked append-only must be opened for appending.
*/
if ((VTOI(ap->a_vp)->i_ffs_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;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
struct timespec ts;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (vp->v_usecount > 1) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
ITIMES(ip, &ts, &ts, &ts);
}
simple_unlock(&vp->v_interlock);
return (0);
}
int
ufs_access(void *v)
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *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
if ((error = getinoquota(ip)) != 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_ffs_flags & IMMUTABLE))
return (EPERM);
return (vaccess(vp->v_type, ip->i_ffs_mode & ALLPERMS,
ip->i_ffs_uid, ip->i_ffs_gid, mode, ap->a_cred));
}
/* ARGSUSED */
int
ufs_getattr(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
struct vattr *vap;
struct timespec ts;
vp = ap->a_vp;
ip = VTOI(vp);
vap = ap->a_vap;
TIMEVAL_TO_TIMESPEC(&time, &ts);
ITIMES(ip, &ts, &ts, &ts);
/*
* Copy from inode table
*/
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_ffs_mode & ALLPERMS;
vap->va_nlink = ip->i_ffs_effnlink;
vap->va_uid = ip->i_ffs_uid;
vap->va_gid = ip->i_ffs_gid;
vap->va_rdev = ufs_rw32((dev_t)ip->i_ffs_rdev,
UFS_MPNEEDSWAP(vp->v_mount));
vap->va_size = ip->i_ffs_size;
vap->va_atime.tv_sec = ip->i_ffs_atime;
vap->va_atime.tv_nsec = ip->i_ffs_atimensec;
vap->va_mtime.tv_sec = ip->i_ffs_mtime;
vap->va_mtime.tv_nsec = ip->i_ffs_mtimensec;
vap->va_ctime.tv_sec = ip->i_ffs_ctime;
vap->va_ctime.tv_nsec = ip->i_ffs_ctimensec;
vap->va_flags = ip->i_ffs_flags;
vap->va_gen = ip->i_ffs_gen;
/* 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_bytes = dbtob((u_quad_t)ip->i_ffs_blocks);
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;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vattr *vap;
struct vnode *vp;
struct inode *ip;
struct ucred *cred;
struct proc *p;
int error;
vap = ap->a_vap;
vp = ap->a_vp;
ip = VTOI(vp);
cred = ap->a_cred;
p = ap->a_p;
/*
* 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);
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != ip->i_ffs_uid &&
(error = suser(cred, &p->p_acflag)))
return (error);
if (cred->cr_uid == 0) {
if ((ip->i_ffs_flags & (SF_IMMUTABLE | SF_APPEND)) &&
securelevel > 0)
return (EPERM);
ip->i_ffs_flags = vap->va_flags;
} else {
if ((ip->i_ffs_flags & (SF_IMMUTABLE | SF_APPEND)) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags)
return (EPERM);
if ((ip->i_ffs_flags & SF_SETTABLE) !=
(vap->va_flags & SF_SETTABLE))
return (EPERM);
ip->i_ffs_flags &= SF_SETTABLE;
ip->i_ffs_flags |= (vap->va_flags & UF_SETTABLE);
}
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (ip->i_ffs_flags & (IMMUTABLE | APPEND))
return (EPERM);
/*
* 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)
return (EROFS);
error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
if (error)
return (error);
}
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:
return (EISDIR);
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
default:
break;
}
error = VOP_TRUNCATE(vp, vap->va_size, 0, cred, p);
if (error)
return (error);
}
ip = VTOI(vp);
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != ip->i_ffs_uid &&
(error = suser(cred, &p->p_acflag)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, p))))
return (error);
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;
error = VOP_UPDATE(vp, &vap->va_atime, &vap->va_mtime, 0);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ufs_chmod(vp, (int)vap->va_mode, cred, p);
}
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ufs_chmod(struct vnode *vp, int mode, struct ucred *cred, struct proc *p)
{
struct inode *ip;
int error;
ip = VTOI(vp);
if (cred->cr_uid != ip->i_ffs_uid &&
(error = suser(cred, &p->p_acflag)))
return (error);
if (cred->cr_uid) {
if (vp->v_type != VDIR && (mode & S_ISTXT))
return (EFTYPE);
if (!groupmember(ip->i_ffs_gid, cred) && (mode & ISGID))
return (EPERM);
}
ip->i_ffs_mode &= ~ALLPERMS;
ip->i_ffs_mode |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
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, struct ucred *cred,
struct proc *p)
{
struct inode *ip;
int error;
#ifdef QUOTA
uid_t ouid;
gid_t ogid;
int i;
long change;
#endif
ip = VTOI(vp);
error = 0;
if (uid == (uid_t)VNOVAL)
uid = ip->i_ffs_uid;
if (gid == (gid_t)VNOVAL)
gid = ip->i_ffs_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 ((cred->cr_uid != ip->i_ffs_uid || uid != ip->i_ffs_uid ||
(gid != ip->i_ffs_gid && !groupmember((gid_t)gid, cred))) &&
((error = suser(cred, &p->p_acflag)) != 0))
return (error);
#ifdef QUOTA
ogid = ip->i_ffs_gid;
ouid = ip->i_ffs_uid;
if ((error = getinoquota(ip)) != 0)
return (error);
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
change = ip->i_ffs_blocks;
(void) chkdq(ip, -change, cred, CHOWN);
(void) chkiq(ip, -1, cred, CHOWN);
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
#endif
ip->i_ffs_gid = gid;
ip->i_ffs_uid = uid;
#ifdef QUOTA
if ((error = getinoquota(ip)) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
goto good;
else
(void) chkdq(ip, -change, cred, CHOWN|FORCE);
}
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
}
ip->i_ffs_gid = ogid;
ip->i_ffs_uid = ouid;
if (getinoquota(ip) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
(void) chkdq(ip, change, cred, FORCE|CHOWN);
(void) chkiq(ip, 1, cred, FORCE|CHOWN);
(void) getinoquota(ip);
}
return (error);
good:
if (getinoquota(ip))
panic("chown: lost quota");
#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);
if (vp->v_type == VDIR || (ip->i_ffs_flags & (IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_ffs_flags & APPEND))
error = EPERM;
else
error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
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
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_ffs_nlink >= LINK_MAX) {
VOP_ABORTOP(dvp, cnp);
error = EMLINK;
goto out1;
}
if (ip->i_ffs_flags & (IMMUTABLE | APPEND)) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out1;
}
ip->i_ffs_effnlink++;
ip->i_ffs_nlink++;
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip);
error = VOP_UPDATE(vp, NULL, NULL, UPDATE_DIROP);
if (!error) {
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, vp, &newdir, cnp, NULL);
}
if (error) {
ip->i_ffs_effnlink--;
ip->i_ffs_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:
vput(dvp);
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;
struct componentname *cnp;
struct direct newdir;
int error;
dvp = ap->a_dvp;
cnp = ap->a_cnp;
error = 0;
switch (ap->a_flags) {
case LOOKUP:
/* 4.4 format directories support whiteout operations */
if (dvp->v_mount->mnt_maxsymlinklen > 0)
return (0);
return (EOPNOTSUPP);
case CREATE:
/* create a new directory whiteout */
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & SAVENAME) == 0)
panic("ufs_whiteout: missing name");
if (dvp->v_mount->mnt_maxsymlinklen <= 0)
panic("ufs_whiteout: old format filesystem");
#endif
newdir.d_ino = WINO;
newdir.d_namlen = cnp->cn_namelen;
memcpy(newdir.d_name, cnp->cn_nameptr,
(unsigned)cnp->cn_namelen + 1);
newdir.d_type = DT_WHT;
error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL);
break;
case DELETE:
/* remove an existing directory whiteout */
#ifdef DIAGNOSTIC
if (dvp->v_mount->mnt_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;
}
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 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_ffs_flags & (IMMUTABLE | APPEND)) ||
(VTOI(tdvp)->i_ffs_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;
if ((error = relookup(fdvp, &fvp, fcnp))){
/* relookup blew away 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_ffs_nlink >= LINK_MAX) {
VOP_UNLOCK(fvp, 0);
error = EMLINK;
goto abortit;
}
if ((ip->i_ffs_flags & (IMMUTABLE | APPEND)) ||
(dp->i_ffs_flags & APPEND)) {
VOP_UNLOCK(fvp, 0);
error = EPERM;
goto abortit;
}
if ((ip->i_ffs_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;
}
/* vrele(fdvp); */
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
/*
* 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_ffs_nlink++;
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip);
if ((error = VOP_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 heirarchy 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_proc);
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 looses */
if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0) {
vrele(tdvp);
goto out;
}
tcnp->cn_flags &= ~SAVESTART;
if ((error = relookup(tdvp, &tvp, tcnp)) != 0)
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_ffs_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_ffs_effnlink++;
dp->i_ffs_nlink++;
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
if ((error = VOP_UPDATE(tdvp, NULL, NULL,
UPDATE_DIROP)) != 0) {
dp->i_ffs_effnlink--;
dp->i_ffs_nlink--;
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
goto bad;
}
}
ufs_makedirentry(ip, tcnp, &newdir);
error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL);
if (error != 0) {
if (doingdirectory && newparent) {
dp->i_ffs_effnlink--;
dp->i_ffs_nlink--;
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp);
(void)VOP_UPDATE(tdvp, NULL, NULL,
UPDATE_WAIT|UPDATE_DIROP);
}
goto bad;
}
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_ffs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
tcnp->cn_cred->cr_uid != dp->i_ffs_uid &&
xp->i_ffs_uid != tcnp->cn_cred->cr_uid) {
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_ffs_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_ffs_mode), doingdirectory && newparent ?
newparent : doingdirectory)) != 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_ffs_nlink--;
dp->i_flag |= IN_CHANGE;
}
xp->i_ffs_nlink--;
xp->i_flag |= IN_CHANGE;
if ((error = VOP_TRUNCATE(tvp, (off_t)0, IO_SYNC,
tcnp->cn_cred, tcnp->cn_proc)))
goto bad;
}
vput(tdvp);
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~(MODMASK | SAVESTART);
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((error = relookup(fdvp, &fvp, fcnp))) {
vrele(ap->a_fvp);
return (error);
}
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);
return (0);
}
/*
* 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) {
xp->i_offset = mastertemplate.dot_reclen;
ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
cache_purge(fdvp);
}
error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
xp->i_flag &= ~IN_RENAME;
}
if (dp)
vput(fdvp);
if (xp)
vput(fvp);
vrele(ap->a_fvp);
return (error);
/* 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_ffs_nlink--;
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip);
vput(fvp);
} else
vrele(fvp);
vrele(fdvp);
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, *tvp;
struct vattr *vap;
struct componentname *cnp;
struct inode *ip, *dp;
struct buf *bp;
struct dirtemplate dirtemplate;
struct direct newdir;
int error, dmode, blkoff;
dvp = ap->a_dvp;
vap = ap->a_vap;
cnp = ap->a_cnp;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_mkdir: no name");
#endif
dp = VTOI(dvp);
if ((nlink_t)dp->i_ffs_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 = VOP_VALLOC(dvp, dmode, cnp->cn_cred, &tvp)) != 0)
goto out;
ip = VTOI(tvp);
ip->i_ffs_uid = cnp->cn_cred->cr_uid;
ip->i_ffs_gid = dp->i_ffs_gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
PNBUF_PUT(cnp->cn_pnbuf);
VOP_VFREE(tvp, ip->i_number, dmode);
vput(tvp);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_ffs_mode = dmode;
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_ffs_effnlink = 2;
ip->i_ffs_nlink = 2;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
if (cnp->cn_flags & ISWHITEOUT)
ip->i_ffs_flags |= UF_OPAQUE;
error = VOP_UPDATE(tvp, NULL, NULL, UPDATE_WAIT|UPDATE_DIROP);
/*
* 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_ffs_nlink++;
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp);
if ((error = VOP_UPDATE(dvp, NULL, NULL, UPDATE_DIROP)) != 0)
goto bad;
/*
* Initialize directory with "." and ".." from static template.
*/
dirtemplate = mastertemplate;
dirtemplate.dot_ino = ufs_rw32(ip->i_number,
UFS_MPNEEDSWAP(dvp->v_mount));
dirtemplate.dotdot_ino = ufs_rw32(dp->i_number,
UFS_MPNEEDSWAP(dvp->v_mount));
dirtemplate.dot_reclen = ufs_rw16(dirtemplate.dot_reclen,
UFS_MPNEEDSWAP(dvp->v_mount));
dirtemplate.dotdot_reclen = ufs_rw16(dirtemplate.dotdot_reclen,
UFS_MPNEEDSWAP(dvp->v_mount));
if (dvp->v_mount->mnt_maxsymlinklen <= 0) {
#if BYTE_ORDER == LITTLE_ENDIAN
if (UFS_MPNEEDSWAP(dvp->v_mount) == 0)
#else
if (UFS_MPNEEDSWAP(dvp->v_mount) != 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 = VOP_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
B_CLRBUF, &bp)) != 0)
goto bad;
ip->i_ffs_size = DIRBLKSIZ;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
uvm_vnp_setsize(tvp, ip->i_ffs_size);
memcpy((caddr_t)bp->b_data, (caddr_t)&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 *)
(bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
blkoff += DIRBLKSIZ;
}
}
if ((error = VOP_UPDATE(tvp, NULL, NULL, UPDATE_DIROP)) != 0) {
(void)VOP_BWRITE(bp);
goto bad;
}
/*
* 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(dvp) && ((error = VOP_BWRITE(bp)) != 0))
goto bad;
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
bad:
if (error == 0) {
*ap->a_vpp = tvp;
} else {
dp->i_ffs_effnlink--;
dp->i_ffs_nlink--;
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp);
/*
* No need to do an explicit VOP_TRUNCATE here, vrele will
* do this for us because we set the link count to 0.
*/
ip->i_ffs_effnlink = 0;
ip->i_ffs_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);
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) {
vrele(dvp);
if (vp->v_mountedhere != NULL)
VOP_UNLOCK(dvp, 0);
vput(vp);
return (EINVAL);
}
/*
* 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_ffs_flags & APPEND) ||
(ip->i_ffs_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,
*/
dp->i_ffs_effnlink--;
ip->i_ffs_effnlink--;
if (DOINGSOFTDEP(vp)) {
softdep_change_linkcnt(dp);
softdep_change_linkcnt(ip);
}
error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
if (error) {
dp->i_ffs_effnlink++;
ip->i_ffs_effnlink++;
if (DOINGSOFTDEP(vp)) {
softdep_change_linkcnt(dp);
softdep_change_linkcnt(ip);
}
goto out;
}
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_ffs_nlink--;
dp->i_flag |= IN_CHANGE;
ip->i_ffs_nlink--;
ip->i_flag |= IN_CHANGE;
error = VOP_TRUNCATE(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
cnp->cn_proc);
}
cache_purge(vp);
out:
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;
error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp);
if (error)
return (error);
vp = *vpp;
len = strlen(ap->a_target);
if (len < vp->v_mount->mnt_maxsymlinklen) {
ip = VTOI(vp);
memcpy((char *)ip->i_ffs_shortlink, ap->a_target, len);
ip->i_ffs_size = len;
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,
(struct proc *)0);
if (error)
vput(vp);
return (error);
}
/*
* Vnode op for reading directories.
*
* The routine below assumes that the on-disk format of a directory
* is the same as that defined by <sys/dirent.h>. If the on-disk
* format changes, then it will be necessary to do a conversion
* from the on-disk format that read returns to the format defined
* by <sys/dirent.h>.
*/
int
ufs_readdir(void *v)
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
off_t **a_cookies;
int *ncookies;
} */ *ap = v;
struct uio *uio;
int error;
size_t count, lost;
off_t off;
uio = ap->a_uio;
off = uio->uio_offset;
count = uio->uio_resid;
/* Make sure we don't return partial entries. */
count -= (uio->uio_offset + count) & (DIRBLKSIZ -1);
if (count <= 0)
return (EINVAL);
lost = uio->uio_resid - count;
uio->uio_resid = count;
uio->uio_iov->iov_len = count;
#if BYTE_ORDER == LITTLE_ENDIAN
if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0 &&
UFS_MPNEEDSWAP(ap->a_vp->v_mount) == 0)
#else
if (UFS_MPNEEDSWAP(ap->a_vp->v_mount) == 0)
#endif
{
error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
} else {
struct dirent *dp, *edp;
struct uio auio;
struct iovec aiov;
caddr_t dirbuf;
int readcnt;
u_char tmp;
auio = *uio;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
aiov.iov_len = count;
MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK);
aiov.iov_base = dirbuf;
error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
if (error == 0) {
readcnt = count - auio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
#if BYTE_ORDER == LITTLE_ENDIAN
if (ap->a_vp->v_mount->mnt_maxsymlinklen <= 0 &&
UFS_MPNEEDSWAP(ap->a_vp->v_mount) == 0)
#else
if (ap->a_vp->v_mount->mnt_maxsymlinklen <= 0 &&
UFS_MPNEEDSWAP(ap->a_vp->v_mount) != 0)
#endif
{
tmp = dp->d_namlen;
dp->d_namlen = dp->d_type;
dp->d_type = tmp;
}
dp->d_fileno = ufs_rw32(dp->d_fileno,
UFS_MPNEEDSWAP(ap->a_vp->v_mount));
dp->d_reclen = ufs_rw16(dp->d_reclen,
UFS_MPNEEDSWAP(ap->a_vp->v_mount));
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, uio);
}
FREE(dirbuf, M_TEMP);
}
if (!error && ap->a_ncookies) {
struct dirent *dp, *dpstart;
off_t *cookies, offstart;
int ncookies;
/*
* Only the NFS server and emulations use cookies, and they
* load the directory block into system space, so we can
* just look at it directly.
*/
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
panic("ufs_readdir: lost in space");
dpstart = (struct dirent *)
((caddr_t)uio->uio_iov->iov_base - (uio->uio_offset - off));
offstart = off;
for (dp = dpstart, ncookies = 0; off < uio->uio_offset; ) {
if (dp->d_reclen == 0)
break;
off += dp->d_reclen;
ncookies++;
dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
}
lost += uio->uio_offset - off;
cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
uio->uio_offset = off;
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
for (off = offstart, dp = dpstart; off < uio->uio_offset; ) {
off += dp->d_reclen;
*(cookies++) = off;
dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
}
}
uio->uio_resid += lost;
*ap->a_eofflag = VTOI(ap->a_vp)->i_ffs_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;
struct ucred *a_cred;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
int isize;
vp = ap->a_vp;
ip = VTOI(vp);
isize = ip->i_ffs_size;
if (isize < vp->v_mount->mnt_maxsymlinklen ||
(vp->v_mount->mnt_maxsymlinklen == 0 && ip->i_ffs_blocks == 0)) {
uiomove((char *)ip->i_ffs_shortlink, 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 buf *a_bp;
} */ *ap = v;
struct buf *bp;
struct vnode *vp;
struct inode *ip;
int error;
bp = ap->a_bp;
vp = bp->b_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;
bp->b_flags |= B_ERROR;
biodone(bp);
return (error);
}
if ((long)bp->b_blkno == -1) /* no valid data */
clrbuf(bp);
}
if ((long)bp->b_blkno < 0) { /* block is not on disk */
biodone(bp);
return (0);
}
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
return (0);
}
/*
* 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 %d, on dev %d, %d", 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_ffs_nlink);
printf("\tmode 0%o, owner %d, group %d, size %qd",
ip->i_ffs_mode, ip->i_ffs_uid, ip->i_ffs_gid,
(long long)ip->i_ffs_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;
struct ucred *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;
struct ucred *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_CHANGE | IN_UPDATE;
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;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
struct timespec ts;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (vp->v_usecount > 1) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
ITIMES(ip, &ts, &ts, &ts);
}
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;
struct ucred *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;
struct ucred *a_cred;
} */ *ap = v;
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
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;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp;
struct inode *ip;
struct timespec ts;
vp = ap->a_vp;
ip = VTOI(vp);
simple_lock(&vp->v_interlock);
if (ap->a_vp->v_usecount > 1) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
ITIMES(ip, &ts, &ts, &ts);
}
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;
caddr_t 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_ffs_size);
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
int
ufs_vinit(struct mount *mntp, int (**specops)(void *), int (**fifoops)(void *),
struct vnode **vpp)
{
struct inode *ip;
struct vnode *vp, *nvp;
vp = *vpp;
ip = VTOI(vp);
switch(vp->v_type = IFTOVT(ip->i_ffs_mode)) {
case VCHR:
case VBLK:
vp->v_op = specops;
if ((nvp = checkalias(vp,
ufs_rw32(ip->i_ffs_rdev, UFS_MPNEEDSWAP(vp->v_mount)),
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 */
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_flag |= VROOT;
/*
* Initialize modrev times
*/
SETHIGH(ip->i_modrev, mono_time.tv_sec);
SETLOW(ip->i_modrev, mono_time.tv_usec * 4294);
*vpp = vp;
return (0);
}
/*
* 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;
pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((error = VOP_VALLOC(dvp, mode, cnp->cn_cred, &tvp)) != 0) {
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
return (error);
}
ip = VTOI(tvp);
ip->i_ffs_gid = pdir->i_ffs_gid;
ip->i_ffs_uid = cnp->cn_cred->cr_uid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
PNBUF_PUT(cnp->cn_pnbuf);
VOP_VFREE(tvp, ip->i_number, mode);
vput(tvp);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_ffs_mode = mode;
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_ffs_effnlink = 1;
ip->i_ffs_nlink = 1;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip);
if ((ip->i_ffs_mode & ISGID) &&
!groupmember(ip->i_ffs_gid, cnp->cn_cred) &&
suser(cnp->cn_cred, NULL))
ip->i_ffs_mode &= ~ISGID;
if (cnp->cn_flags & ISWHITEOUT)
ip->i_ffs_flags |= UF_OPAQUE;
/*
* Make sure inode goes to disk before directory entry.
*/
if ((error = VOP_UPDATE(tvp, NULL, NULL, UPDATE_DIROP)) != 0)
goto bad;
ufs_makedirentry(ip, cnp, &newdir);
if ((error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL)) != 0)
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.
*/
PNBUF_PUT(cnp->cn_pnbuf);
vput(dvp);
ip->i_ffs_effnlink = 0;
ip->i_ffs_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;
vput(tvp);
return (error);
}
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