401 lines
9.1 KiB
C
401 lines
9.1 KiB
C
/* $NetBSD: ptyfs_vfsops.c,v 1.3 2004/11/25 05:15:10 christos 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 1.3 2004/11/25 05:15:10 christos 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,
|
|
ptyfs_vnodeopv_descs,
|
|
};
|