freebsd-dev/sys/fs/fifofs/fifo_vnops.c
1995-12-14 09:55:16 +00:00

546 lines
13 KiB
C

/*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*
* @(#)fifo_vnops.c 8.2 (Berkeley) 1/4/94
* $Id: fifo_vnops.c,v 1.14 1995/12/11 10:26:34 phk Exp $
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/un.h>
#include <miscfs/fifofs/fifo.h>
/*
* This structure is associated with the FIFO vnode and stores
* the state associated with the FIFO.
*/
struct fifoinfo {
struct socket *fi_readsock;
struct socket *fi_writesock;
long fi_readers;
long fi_writers;
};
static int fifo_ebadf __P((void));
static int fifo_unlock __P((struct vop_unlock_args *));
static int fifo_lock __P((struct vop_lock_args *));
static int fifo_print __P((struct vop_print_args *));
vop_t **fifo_vnodeop_p;
static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *)vn_default_error },
{ &vop_lookup_desc, (vop_t *)fifo_lookup }, /* lookup */
{ &vop_create_desc, (vop_t *)fifo_create }, /* create */
{ &vop_mknod_desc, (vop_t *)fifo_mknod }, /* mknod */
{ &vop_open_desc, (vop_t *)fifo_open }, /* open */
{ &vop_close_desc, (vop_t *)fifo_close }, /* close */
{ &vop_access_desc, (vop_t *)fifo_access }, /* access */
{ &vop_getattr_desc, (vop_t *)fifo_getattr }, /* getattr */
{ &vop_setattr_desc, (vop_t *)fifo_setattr }, /* setattr */
{ &vop_read_desc, (vop_t *)fifo_read }, /* read */
{ &vop_write_desc, (vop_t *)fifo_write }, /* write */
{ &vop_ioctl_desc, (vop_t *)fifo_ioctl }, /* ioctl */
{ &vop_select_desc, (vop_t *)fifo_select }, /* select */
{ &vop_mmap_desc, (vop_t *)fifo_mmap }, /* mmap */
{ &vop_fsync_desc, (vop_t *)fifo_fsync }, /* fsync */
{ &vop_seek_desc, (vop_t *)fifo_seek }, /* seek */
{ &vop_remove_desc, (vop_t *)fifo_remove }, /* remove */
{ &vop_link_desc, (vop_t *)fifo_link }, /* link */
{ &vop_rename_desc, (vop_t *)fifo_rename }, /* rename */
{ &vop_mkdir_desc, (vop_t *)fifo_mkdir }, /* mkdir */
{ &vop_rmdir_desc, (vop_t *)fifo_rmdir }, /* rmdir */
{ &vop_symlink_desc, (vop_t *)fifo_symlink }, /* symlink */
{ &vop_readdir_desc, (vop_t *)fifo_readdir }, /* readdir */
{ &vop_readlink_desc, (vop_t *)fifo_readlink }, /* readlink */
{ &vop_abortop_desc, (vop_t *)fifo_abortop }, /* abortop */
{ &vop_inactive_desc, (vop_t *)fifo_inactive }, /* inactive */
{ &vop_reclaim_desc, (vop_t *)fifo_reclaim }, /* reclaim */
{ &vop_lock_desc, (vop_t *)fifo_lock }, /* lock */
{ &vop_unlock_desc, (vop_t *)fifo_unlock }, /* unlock */
{ &vop_bmap_desc, (vop_t *)fifo_bmap }, /* bmap */
{ &vop_strategy_desc, (vop_t *)fifo_strategy }, /* strategy */
{ &vop_print_desc, (vop_t *)fifo_print }, /* print */
{ &vop_islocked_desc, (vop_t *)fifo_islocked }, /* islocked */
{ &vop_pathconf_desc, (vop_t *)fifo_pathconf }, /* pathconf */
{ &vop_advlock_desc, (vop_t *)fifo_advlock }, /* advlock */
{ &vop_blkatoff_desc, (vop_t *)fifo_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, (vop_t *)fifo_valloc }, /* valloc */
{ &vop_vfree_desc, (vop_t *)fifo_vfree }, /* vfree */
{ &vop_truncate_desc, (vop_t *)fifo_truncate }, /* truncate */
{ &vop_update_desc, (vop_t *)fifo_update }, /* update */
{ &vop_bwrite_desc, (vop_t *)fifo_bwrite }, /* bwrite */
{ NULL, NULL }
};
static struct vnodeopv_desc fifo_vnodeop_opv_desc =
{ &fifo_vnodeop_p, fifo_vnodeop_entries };
VNODEOP_SET(fifo_vnodeop_opv_desc);
/*
* Trivial lookup routine that always fails.
*/
/* ARGSUSED */
int
fifo_lookup(ap)
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
} */ *ap;
{
*ap->a_vpp = NULL;
return (ENOTDIR);
}
/*
* Open called to set up a new instance of a fifo or
* to find an active instance of a fifo.
*/
/* ARGSUSED */
int
fifo_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fifoinfo *fip;
struct socket *rso, *wso;
int error;
static char openstr[] = "fifo";
if ((fip = vp->v_fifoinfo) == NULL) {
MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
vp->v_fifoinfo = fip;
error = socreate(AF_UNIX, &rso, SOCK_STREAM, 0);
if (error) {
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_readsock = rso;
error = socreate(AF_UNIX, &wso, SOCK_STREAM, 0);
if (error) {
(void)soclose(rso);
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_writesock = wso;
error = unp_connect2(wso, rso);
if (error) {
(void)soclose(wso);
(void)soclose(rso);
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_readers = fip->fi_writers = 0;
wso->so_state |= SS_CANTRCVMORE;
rso->so_state |= SS_CANTSENDMORE;
}
error = 0;
if ((ap->a_mode & (FREAD|FWRITE)) == (FREAD|FWRITE)) {
if (fip->fi_readers == 0) {
fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
if (fip->fi_writers > 0)
wakeup((caddr_t)&fip->fi_writers);
}
if (fip->fi_writers == 0) {
fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
if (fip->fi_readers > 0)
wakeup((caddr_t)&fip->fi_readers);
}
fip->fi_readers++;
fip->fi_writers++;
}
else if (ap->a_mode & FREAD) {
fip->fi_readers++;
if (fip->fi_readers == 1) {
fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
if (fip->fi_writers > 0)
wakeup((caddr_t)&fip->fi_writers);
}
if (!(ap->a_mode & O_NONBLOCK))
while (fip->fi_writers == 0) {
VOP_UNLOCK(vp);
error = tsleep((caddr_t)&fip->fi_readers,
PCATCH | PSOCK, openstr, 0);
VOP_LOCK(vp);
if (error)
break;
}
}
else {
fip->fi_writers++;
if (fip->fi_readers == 0 && (ap->a_mode & O_NONBLOCK)) {
error = ENXIO;
} else {
if (fip->fi_writers == 1) {
fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
if (fip->fi_readers > 0)
wakeup((caddr_t)&fip->fi_readers);
}
while (fip->fi_readers == 0) {
VOP_UNLOCK(vp);
error = tsleep((caddr_t)&fip->fi_writers,
PCATCH | PSOCK, openstr, 0);
VOP_LOCK(vp);
if (error)
break;
}
}
}
if (error)
VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
return (error);
}
/*
* Vnode op for read
*/
/* ARGSUSED */
int
fifo_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct uio *uio = ap->a_uio;
register struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
int error, startresid;
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_READ)
panic("fifo_read mode");
#endif
if (uio->uio_resid == 0)
return (0);
if (ap->a_ioflag & IO_NDELAY)
rso->so_state |= SS_NBIO;
startresid = uio->uio_resid;
VOP_UNLOCK(ap->a_vp);
error = soreceive(rso, (struct mbuf **)0, uio,
(struct mbuf **)0, (struct mbuf **)0, (int*)0);
VOP_LOCK(ap->a_vp);
/*
* Clear EOF indication after first such return.
*/
if (uio->uio_resid == startresid)
rso->so_state &= ~SS_CANTRCVMORE;
if (ap->a_ioflag & IO_NDELAY)
rso->so_state &= ~SS_NBIO;
return (error);
}
/*
* Vnode op for write
*/
/* ARGSUSED */
int
fifo_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
int error;
#ifdef DIAGNOSTIC
if (ap->a_uio->uio_rw != UIO_WRITE)
panic("fifo_write mode");
#endif
if (ap->a_ioflag & IO_NDELAY)
wso->so_state |= SS_NBIO;
VOP_UNLOCK(ap->a_vp);
error = sosend(wso, (struct mbuf *)0, ap->a_uio, 0, (struct mbuf *)0, 0);
VOP_LOCK(ap->a_vp);
if (ap->a_ioflag & IO_NDELAY)
wso->so_state &= ~SS_NBIO;
return (error);
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
int
fifo_ioctl(ap)
struct vop_ioctl_args /* {
struct vnode *a_vp;
int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct file filetmp;
if (ap->a_command == FIONBIO)
return (0);
if (ap->a_fflag & FREAD)
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
else
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
return (soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p));
}
/* ARGSUSED */
int
fifo_select(ap)
struct vop_select_args /* {
struct vnode *a_vp;
int a_which;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
struct file filetmp;
if (ap->a_fflags & FREAD)
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
else
filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
return (soo_select(&filetmp, ap->a_which, ap->a_p));
}
/*
* This is a noop, simply returning what one has been given.
*/
int
fifo_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */ *ap;
{
if (ap->a_vpp != NULL)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp != NULL)
*ap->a_runp = 0;
if (ap->a_runb != NULL)
*ap->a_runb = 0;
return (0);
}
/*
* At the moment we do not do any locking.
*/
/* ARGSUSED */
static int
fifo_lock(ap)
struct vop_lock_args /* {
struct vnode *a_vp;
} */ *ap;
{
return (0);
}
/* ARGSUSED */
static int
fifo_unlock(ap)
struct vop_unlock_args /* {
struct vnode *a_vp;
} */ *ap;
{
return (0);
}
/*
* Device close routine
*/
/* ARGSUSED */
int
fifo_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fifoinfo *fip = vp->v_fifoinfo;
int error1, error2;
if (ap->a_fflag & FWRITE) {
fip->fi_writers--;
if (fip->fi_writers == 0)
socantrcvmore(fip->fi_readsock);
}
if (ap->a_fflag & FREAD) {
fip->fi_readers--;
if (fip->fi_readers == 0)
socantsendmore(fip->fi_writesock);
}
if (vp->v_usecount > 1)
return (0);
error1 = soclose(fip->fi_readsock);
error2 = soclose(fip->fi_writesock);
FREE(fip, M_VNODE);
vp->v_fifoinfo = NULL;
if (error1)
return (error1);
return (error2);
}
/*
* Print out internal contents of a fifo vnode.
*/
int
fifo_printinfo(vp)
struct vnode *vp;
{
register struct fifoinfo *fip = vp->v_fifoinfo;
printf(", fifo with %ld readers and %ld writers",
fip->fi_readers, fip->fi_writers);
return (0);
}
/*
* Print out the contents of a fifo vnode.
*/
static int
fifo_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
printf("tag VT_NON");
fifo_printinfo(ap->a_vp);
printf("\n");
return (0);
}
/*
* Return POSIX pathconf information applicable to fifo's.
*/
int
fifo_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */ *ap;
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Fifo failed operation
*/
static int
fifo_ebadf()
{
return (EBADF);
}
/*
* Fifo advisory byte-level locks.
*/
/* ARGSUSED */
int
fifo_advlock(ap)
struct vop_advlock_args /* {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap;
{
return (EOPNOTSUPP);
}
/*
* Fifo bad operation
*/
int
fifo_badop()
{
panic("fifo_badop called");
/* NOTREACHED */
}