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NetBSD/sys/compat/common/vfs_syscalls_43.c

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/* $NetBSD: vfs_syscalls_43.c,v 1.22 2003/01/18 07:28:34 thorpej Exp $ */
/*
* Copyright (c) 1989, 1993
* 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.
*
* @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_43.c,v 1.22 2003/01/18 07:28:34 thorpej Exp $");
#if defined(_KERNEL_OPT)
#include "fs_union.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/dirent.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/unistd.h>
#include <sys/resourcevar.h>
#include <sys/mount.h>
#include <sys/sa.h>
#include <sys/syscallargs.h>
static void cvtstat __P((struct stat *, struct stat43 *));
/*
* Convert from an old to a new stat structure.
*/
static void
cvtstat(st, ost)
struct stat *st;
struct stat43 *ost;
{
ost->st_dev = st->st_dev;
ost->st_ino = st->st_ino;
ost->st_mode = st->st_mode & 0xffff;
ost->st_nlink = st->st_nlink;
ost->st_uid = st->st_uid;
ost->st_gid = st->st_gid;
ost->st_rdev = st->st_rdev;
if (st->st_size < (quad_t)1 << 32)
ost->st_size = st->st_size;
else
ost->st_size = -2;
ost->st_atime = st->st_atime;
ost->st_mtime = st->st_mtime;
ost->st_ctime = st->st_ctime;
ost->st_blksize = st->st_blksize;
ost->st_blocks = st->st_blocks;
ost->st_flags = st->st_flags;
ost->st_gen = st->st_gen;
}
/*
* Get file status; this version follows links.
*/
/* ARGSUSED */
int
compat_43_sys_stat(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_stat_args /* {
syscallarg(char *) path;
syscallarg(struct stat43 *) ub;
} */ *uap = v;
struct proc *p = l->l_proc;
struct stat sb;
struct stat43 osb;
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
SCARG(uap, path), p);
if ((error = namei(&nd)) != 0)
return (error);
error = vn_stat(nd.ni_vp, &sb, p);
vput(nd.ni_vp);
if (error)
return (error);
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Get file status; this version does not follow links.
*/
/* ARGSUSED */
int
compat_43_sys_lstat(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_lstat_args /* {
syscallarg(char *) path;
syscallarg(struct ostat *) ub;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp, *dvp;
struct stat sb, sb1;
struct stat43 osb;
int error;
struct nameidata nd;
int ndflags;
ndflags = NOFOLLOW | LOCKLEAF | LOCKPARENT;
again:
NDINIT(&nd, LOOKUP, ndflags, UIO_USERSPACE, SCARG(uap, path), p);
if ((error = namei(&nd))) {
if (error == EISDIR && (ndflags & LOCKPARENT) != 0) {
/*
* Should only happen on '/'. Retry without LOCKPARENT;
* this is safe since the vnode won't be a VLNK.
*/
ndflags &= ~LOCKPARENT;
goto again;
}
return (error);
}
/*
* For symbolic links, always return the attributes of its
* containing directory, except for mode, size, and links.
*/
vp = nd.ni_vp;
dvp = nd.ni_dvp;
if (vp->v_type != VLNK) {
if ((ndflags & LOCKPARENT) != 0) {
if (dvp == vp)
vrele(dvp);
else
vput(dvp);
}
error = vn_stat(vp, &sb, p);
vput(vp);
if (error)
return (error);
} else {
error = vn_stat(dvp, &sb, p);
vput(dvp);
if (error) {
vput(vp);
return (error);
}
error = vn_stat(vp, &sb1, p);
vput(vp);
if (error)
return (error);
sb.st_mode &= ~S_IFDIR;
sb.st_mode |= S_IFLNK;
sb.st_nlink = sb1.st_nlink;
sb.st_size = sb1.st_size;
sb.st_blocks = sb1.st_blocks;
}
cvtstat(&sb, &osb);
error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb));
return (error);
}
/*
* Return status information about a file descriptor.
*/
/* ARGSUSED */
int
compat_43_sys_fstat(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_fstat_args /* {
syscallarg(int) fd;
syscallarg(struct stat43 *) sb;
} */ *uap = v;
struct proc *p = l->l_proc;
int fd = SCARG(uap, fd);
struct filedesc *fdp = p->p_fd;
struct file *fp;
struct stat ub;
struct stat43 oub;
int error;
if ((fp = fd_getfile(fdp, fd)) == NULL)
return (EBADF);
FILE_USE(fp);
error = (*fp->f_ops->fo_stat)(fp, &ub, p);
FILE_UNUSE(fp, p);
if (error == 0) {
cvtstat(&ub, &oub);
error = copyout((caddr_t)&oub, (caddr_t)SCARG(uap, sb),
sizeof (oub));
}
return (error);
}
/*
* Truncate a file given a file descriptor.
*/
/* ARGSUSED */
int
compat_43_sys_ftruncate(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_ftruncate_args /* {
syscallarg(int) fd;
syscallarg(long) length;
} */ *uap = v;
struct sys_ftruncate_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ nuap;
SCARG(&nuap, fd) = SCARG(uap, fd);
SCARG(&nuap, length) = SCARG(uap, length);
return (sys_ftruncate(l, &nuap, retval));
}
/*
* Truncate a file given its path name.
*/
/* ARGSUSED */
int
compat_43_sys_truncate(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_truncate_args /* {
syscallarg(char *) path;
syscallarg(long) length;
} */ *uap = v;
struct sys_truncate_args /* {
syscallarg(char *) path;
syscallarg(int) pad;
syscallarg(off_t) length;
} */ nuap;
SCARG(&nuap, path) = SCARG(uap, path);
SCARG(&nuap, length) = SCARG(uap, length);
return (sys_truncate(l, &nuap, retval));
}
/*
* Reposition read/write file offset.
*/
int
compat_43_sys_lseek(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_lseek_args /* {
syscallarg(int) fd;
syscallarg(long) offset;
syscallarg(int) whence;
} */ *uap = v;
struct sys_lseek_args /* {
syscallarg(int) fd;
syscallarg(int) pad;
syscallarg(off_t) offset;
syscallarg(int) whence;
} */ nuap;
off_t qret;
int error;
SCARG(&nuap, fd) = SCARG(uap, fd);
SCARG(&nuap, offset) = SCARG(uap, offset);
SCARG(&nuap, whence) = SCARG(uap, whence);
error = sys_lseek(l, &nuap, (void *)&qret);
*(long *)retval = qret;
return (error);
}
/*
* Create a file.
*/
int
compat_43_sys_creat(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_creat_args /* {
syscallarg(char *) path;
syscallarg(int) mode;
} */ *uap = v;
struct sys_open_args /* {
syscallarg(char *) path;
syscallarg(int) flags;
syscallarg(int) mode;
} */ nuap;
SCARG(&nuap, path) = SCARG(uap, path);
SCARG(&nuap, mode) = SCARG(uap, mode);
SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC;
return (sys_open(l, &nuap, retval));
}
/*ARGSUSED*/
int
compat_43_sys_quota(struct lwp *l, void *v, register_t *retval)
{
return (ENOSYS);
}
/*
* Read a block of directory entries in a file system independent format.
*/
int
compat_43_sys_getdirentries(struct lwp *l, void *v, register_t *retval)
{
struct compat_43_sys_getdirentries_args /* {
syscallarg(int) fd;
syscallarg(char *) buf;
syscallarg(u_int) count;
syscallarg(long *) basep;
} */ *uap = v;
struct proc *p = l->l_proc;
struct vnode *vp;
struct file *fp;
struct uio auio, kuio;
struct iovec aiov, kiov;
struct dirent *dp, *edp;
caddr_t dirbuf;
int error, eofflag, readcnt;
long loff;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out;
}
vp = (struct vnode *)fp->f_data;
unionread:
if (vp->v_type != VDIR) {
error = EINVAL;
goto out;
}
aiov.iov_base = SCARG(uap, buf);
aiov.iov_len = SCARG(uap, count);
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_procp = p;
auio.uio_resid = SCARG(uap, count);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
loff = auio.uio_offset = fp->f_offset;
# if (BYTE_ORDER != LITTLE_ENDIAN)
if (vp->v_mount->mnt_maxsymlinklen <= 0) {
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
(off_t **)0, (int *)0);
fp->f_offset = auio.uio_offset;
} else
# endif
{
kuio = auio;
kuio.uio_iov = &kiov;
kuio.uio_segflg = UIO_SYSSPACE;
kiov.iov_len = SCARG(uap, count);
MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK);
kiov.iov_base = dirbuf;
error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
(off_t **)0, (int *)0);
fp->f_offset = kuio.uio_offset;
if (error == 0) {
readcnt = SCARG(uap, count) - kuio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* The expected low byte of
* dp->d_namlen is our dp->d_type.
* The high MBZ byte of dp->d_namlen
* is our dp->d_namlen.
*/
dp->d_type = dp->d_namlen;
dp->d_namlen = 0;
# else
/*
* The dp->d_type is the high byte
* of the expected dp->d_namlen,
* so must be zero'ed.
*/
dp->d_type = 0;
# endif
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, &auio);
}
FREE(dirbuf, M_TEMP);
}
VOP_UNLOCK(vp, 0);
if (error)
goto out;
#ifdef UNION
{
extern int (**union_vnodeop_p) __P((void *));
extern struct vnode *union_dircache __P((struct vnode *));
if ((SCARG(uap, count) == auio.uio_resid) &&
(vp->v_op == union_vnodeop_p)) {
struct vnode *lvp;
lvp = union_dircache(vp);
if (lvp != NULLVP) {
struct vattr va;
/*
* If the directory is opaque,
* then don't show lower entries
*/
error = VOP_GETATTR(vp, &va, fp->f_cred, p);
if (va.va_flags & OPAQUE) {
vput(lvp);
lvp = NULL;
}
}
if (lvp != NULLVP) {
error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
VOP_UNLOCK(lvp, 0);
if (error) {
vrele(lvp);
goto out;
}
fp->f_data = (caddr_t) lvp;
fp->f_offset = 0;
error = vn_close(vp, FREAD, fp->f_cred, p);
if (error)
goto out;
vp = lvp;
goto unionread;
}
}
}
#endif /* UNION */
if ((SCARG(uap, count) == auio.uio_resid) &&
(vp->v_flag & VROOT) &&
(vp->v_mount->mnt_flag & MNT_UNION)) {
struct vnode *tvp = vp;
vp = vp->v_mount->mnt_vnodecovered;
VREF(vp);
fp->f_data = (caddr_t) vp;
fp->f_offset = 0;
vrele(tvp);
goto unionread;
}
error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
sizeof(long));
*retval = SCARG(uap, count) - auio.uio_resid;
out:
FILE_UNUSE(fp, p);
return (error);
}
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