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ptyfs_vfsops.c
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ptyfs_vfsops.c
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/* $NetBSD: ptyfs_vfsops.c,v 1.4.4.1 2005/03/19 08:36:11 yamt Exp $ */
/*
* Copyright (c) 1992, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* Pseudo-tty Filesystem
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.4.4.1 2005/03/19 08:36:11 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/stat.h>
#include <sys/dirent.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/select.h>
#include <sys/tty.h>
#include <sys/pty.h>
#include <fs/ptyfs/ptyfs.h>
#include <miscfs/specfs/specdev.h>
MALLOC_DEFINE(M_PTYFSMNT, "ptyfs mount", "ptyfs mount structures");
void ptyfs_init(void);
void ptyfs_reinit(void);
void ptyfs_done(void);
int ptyfs_mount(struct mount *, const char *, void *, struct nameidata *,
struct proc *);
int ptyfs_start(struct mount *, int, struct proc *);
int ptyfs_unmount(struct mount *, int, struct proc *);
int ptyfs_statvfs(struct mount *, struct statvfs *, struct proc *);
int ptyfs_quotactl(struct mount *, int, uid_t, void *, struct proc *);
int ptyfs_sync(struct mount *, int, struct ucred *, struct proc *);
int ptyfs_vget(struct mount *, ino_t, struct vnode **);
int ptyfs_fhtovp(struct mount *, struct fid *, struct vnode **);
int ptyfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **);
int ptyfs_vptofh(struct vnode *, struct fid *);
static int ptyfs__allocvp(struct ptm_pty *, struct proc *, struct vnode **,
dev_t, char);
static int ptyfs__makename(struct ptm_pty *, char *, size_t, dev_t, char);
static void ptyfs__getvattr(struct ptm_pty *, struct proc *, struct vattr *);
/*
* ptm glue: When we mount, we make ptm point to us.
*/
struct ptm_pty *ptyfs_save_ptm;
struct ptm_pty ptm_ptyfspty = {
ptyfs__allocvp,
ptyfs__makename,
ptyfs__getvattr,
NULL
};
static int
ptyfs__makename(struct ptm_pty *pt, char *buf, size_t bufsiz, dev_t dev,
char ms)
{
struct mount *mp = pt->arg;
size_t len;
switch (ms) {
case 'p':
/* We don't provide access to the master, should we? */
len = snprintf(buf, bufsiz, "/dev/null");
break;
case 't':
len = snprintf(buf, bufsiz, "%s/%d", mp->mnt_stat.f_mntonname,
minor(dev));
break;
default:
return EINVAL;
}
return len >= bufsiz ? ENOSPC : 0;
}
static int
/*ARGSUSED*/
ptyfs__allocvp(struct ptm_pty *pt, struct proc *p, struct vnode **vpp,
dev_t dev, char ms)
{
struct mount *mp = pt->arg;
ptyfstype type;
switch (ms) {
case 'p':
type = PTYFSptc;
break;
case 't':
type = PTYFSpts;
break;
default:
return EINVAL;
}
return ptyfs_allocvp(mp, vpp, type, minor(dev), p);
}
static void
ptyfs__getvattr(struct ptm_pty *pt, struct proc *p, struct vattr *vattr)
{
struct mount *mp = pt->arg;
struct ptyfsmount *pmnt = VFSTOPTY(mp);
VATTR_NULL(vattr);
/* get real uid */
vattr->va_uid = p->p_cred->p_ruid;
vattr->va_gid = pmnt->pmnt_gid;
vattr->va_mode = pmnt->pmnt_mode;
}
void
ptyfs_init(void)
{
#ifdef _LKM
malloc_type_attach(M_PTYFSMNT);
#endif
ptyfs_hashinit();
}
void
ptyfs_reinit(void)
{
ptyfs_hashreinit();
}
void
ptyfs_done(void)
{
#ifdef _LKM
malloc_type_detach(M_PTYFSMNT);
#endif
ptyfs_hashdone();
}
/*
* Mount the Pseudo tty params filesystem
*/
int
ptyfs_mount(struct mount *mp, const char *path, void *data,
struct nameidata *ndp, struct proc *p)
{
int error = 0;
struct ptyfsmount *pmnt;
struct ptyfs_args args;
if (UIO_MX & (UIO_MX - 1)) {
log(LOG_ERR, "ptyfs: invalid directory entry size");
return EINVAL;
}
if (mp->mnt_flag & MNT_GETARGS) {
pmnt = VFSTOPTY(mp);
if (pmnt == NULL)
return EIO;
args.version = PTYFS_ARGSVERSION;
args.mode = pmnt->pmnt_mode;
args.gid = pmnt->pmnt_gid;
return copyout(&args, data, sizeof(args));
}
if (mp->mnt_flag & MNT_UPDATE)
return EOPNOTSUPP;
if (data != NULL) {
error = copyin(data, &args, sizeof args);
if (error != 0)
return error;
if (args.version != PTYFS_ARGSVERSION)
return EINVAL;
} else {
/* Compat code; remove and return an error */
args.gid = 4; /* XXX tty gid */
args.mode = S_IRUSR|S_IWUSR|S_IWGRP;
}
pmnt = malloc(sizeof(struct ptyfsmount), M_UFSMNT, M_WAITOK);
mp->mnt_data = pmnt;
pmnt->pmnt_gid = args.gid;
pmnt->pmnt_mode = args.mode;
mp->mnt_flag |= MNT_LOCAL;
vfs_getnewfsid(mp);
if ((error = set_statvfs_info(path, UIO_USERSPACE, "ptyfs",
UIO_SYSSPACE, mp, p)) != 0) {
return error;
}
/* Point pty access to us */
if (ptyfs_save_ptm != NULL)
return EBUSY;
ptm_ptyfspty.arg = mp;
ptyfs_save_ptm = pty_sethandler(&ptm_ptyfspty);
return 0;
}
/*ARGSUSED*/
int
ptyfs_start(struct mount *mp, int flags, struct proc *p)
{
return 0;
}
/*ARGSUSED*/
int
ptyfs_unmount(struct mount *mp, int mntflags, struct proc *p)
{
int error;
int flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = vflush(mp, 0, flags)) != 0)
return (error);
/* Restore where pty access was pointing */
ptm_ptyfspty.arg = NULL;
(void)pty_sethandler(ptyfs_save_ptm);
ptyfs_save_ptm = NULL;
/*
* Finally, throw away the ptyfsmount structure
*/
free(mp->mnt_data, M_UFSMNT);
mp->mnt_data = 0;
return 0;
}
int
ptyfs_root(struct mount *mp, struct vnode **vpp)
{
/* setup "." */
return ptyfs_allocvp(mp, vpp, PTYFSroot, 0, NULL);
}
/*ARGSUSED*/
int
ptyfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg, struct proc *p)
{
return EOPNOTSUPP;
}
/*ARGSUSED*/
int
ptyfs_statvfs(struct mount *mp, struct statvfs *sbp, struct proc *p)
{
sbp->f_bsize = DEV_BSIZE;
sbp->f_frsize = DEV_BSIZE;
sbp->f_iosize = DEV_BSIZE;
sbp->f_blocks = 2; /* 1K to keep df happy */
sbp->f_bfree = 0;
sbp->f_bavail = 0;
sbp->f_bresvd = 0;
sbp->f_files = 1024; /* XXX lie */
sbp->f_ffree = 128; /* XXX lie */
sbp->f_favail = 128; /* XXX lie */
sbp->f_fresvd = 0;
sbp->f_namemax = MAXNAMLEN;
copy_statvfs_info(sbp, mp);
return 0;
}
/*ARGSUSED*/
int
ptyfs_sync(struct mount *mp, int waitfor, struct ucred *uc, struct proc *p)
{
return 0;
}
/*
* Kernfs flat namespace lookup.
* Currently unsupported.
*/
/*ARGSUSED*/
int
ptyfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
return EOPNOTSUPP;
}
/*ARGSUSED*/
int
ptyfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
{
return EOPNOTSUPP;
}
/*ARGSUSED*/
int
ptyfs_checkexp(struct mount *mp, struct mbuf *mb, int *wh, struct ucred **anon)
{
return EOPNOTSUPP;
}
SYSCTL_SETUP(sysctl_vfs_ptyfs_setup, "sysctl vfs.ptyfs subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ptyfs",
SYSCTL_DESCR("Pty file system"),
NULL, 0, NULL, 0,
CTL_VFS, 23, CTL_EOL);
/*
* XXX the "23" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "23" is the order as taken from sys/mount.h
*/
}
/*ARGSUSED*/
int
ptyfs_vptofh(struct vnode *vp, struct fid *fhp)
{
return EOPNOTSUPP;
}
extern const struct vnodeopv_desc ptyfs_vnodeop_opv_desc;
const struct vnodeopv_desc * const ptyfs_vnodeopv_descs[] = {
&ptyfs_vnodeop_opv_desc,
NULL,
};
struct vfsops ptyfs_vfsops = {
MOUNT_PTYFS,
ptyfs_mount,
ptyfs_start,
ptyfs_unmount,
ptyfs_root,
ptyfs_quotactl,
ptyfs_statvfs,
ptyfs_sync,
ptyfs_vget,
ptyfs_fhtovp,
ptyfs_vptofh,
ptyfs_init,
ptyfs_reinit,
ptyfs_done,
NULL,
NULL, /* vfs_mountroot */
ptyfs_checkexp,
(int (*)(struct mount *, struct vnode *, struct timespec *))eopnotsupp,
(int (*)(struct mount *, int, struct vnode *, int, const char *,
struct proc *))eopnotsupp,
ptyfs_vnodeopv_descs,
};