File: [local] / sys / miscfs / fifofs / fifo_vnops.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:18 2008 UTC (16 years, 4 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: fifo_vnops.c,v 1.24 2007/06/18 08:30:07 jasper Exp $ */
/* $NetBSD: fifo_vnops.c,v 1.18 1996/03/16 23:52:42 christos Exp $ */
/*
* 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. 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 8.4 (Berkeley) 8/10/94
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.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/ioctl.h>
#include <sys/file.h>
#include <sys/event.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/poll.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;
};
int (**fifo_vnodeop_p)(void *);
struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, fifo_lookup }, /* lookup */
{ &vop_create_desc, fifo_create }, /* create */
{ &vop_mknod_desc, fifo_mknod }, /* mknod */
{ &vop_open_desc, fifo_open }, /* open */
{ &vop_close_desc, fifo_close }, /* close */
{ &vop_access_desc, fifo_access }, /* access */
{ &vop_getattr_desc, fifo_getattr }, /* getattr */
{ &vop_setattr_desc, fifo_setattr }, /* setattr */
{ &vop_read_desc, fifo_read }, /* read */
{ &vop_write_desc, fifo_write }, /* write */
{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
{ &vop_poll_desc, fifo_poll }, /* poll */
{ &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, fifo_revoke }, /* revoke */
{ &vop_fsync_desc, fifo_fsync }, /* fsync */
{ &vop_remove_desc, fifo_remove }, /* remove */
{ &vop_link_desc, fifo_link }, /* link */
{ &vop_rename_desc, fifo_rename }, /* rename */
{ &vop_mkdir_desc, fifo_mkdir }, /* mkdir */
{ &vop_rmdir_desc, fifo_rmdir }, /* rmdir */
{ &vop_symlink_desc, fifo_symlink }, /* symlink */
{ &vop_readdir_desc, fifo_readdir }, /* readdir */
{ &vop_readlink_desc, fifo_readlink }, /* readlink */
{ &vop_abortop_desc, fifo_abortop }, /* abortop */
{ &vop_inactive_desc, fifo_inactive }, /* inactive */
{ &vop_reclaim_desc, fifo_reclaim }, /* reclaim */
{ &vop_lock_desc, fifo_lock }, /* lock */
{ &vop_unlock_desc, fifo_unlock }, /* unlock */
{ &vop_bmap_desc, fifo_bmap }, /* bmap */
{ &vop_strategy_desc, fifo_strategy }, /* strategy */
{ &vop_print_desc, fifo_print }, /* print */
{ &vop_islocked_desc, fifo_islocked }, /* islocked */
{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
{ &vop_advlock_desc, fifo_advlock }, /* advlock */
{ &vop_bwrite_desc, fifo_bwrite }, /* bwrite */
{ NULL, NULL }
};
struct vnodeopv_desc fifo_vnodeop_opv_desc =
{ &fifo_vnodeop_p, fifo_vnodeop_entries };
int
fifo_vnoperate(void *v)
{
struct vop_generic_args *ap = v;
return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
}
void filt_fifordetach(struct knote *kn);
int filt_fiforead(struct knote *kn, long hint);
void filt_fifowdetach(struct knote *kn);
int filt_fifowrite(struct knote *kn, long hint);
struct filterops fiforead_filtops =
{ 1, NULL, filt_fifordetach, filt_fiforead };
struct filterops fifowrite_filtops =
{ 1, NULL, filt_fifowdetach, filt_fifowrite };
/*
* Trivial lookup routine that always fails.
*/
/* ARGSUSED */
int
fifo_lookup(void *v)
{
struct vop_lookup_args *ap = v;
*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(void *v)
{
struct vop_open_args *ap = v;
struct vnode *vp = ap->a_vp;
struct fifoinfo *fip;
struct proc *p = ap->a_p;
struct socket *rso, *wso;
int error;
if ((fip = vp->v_fifoinfo) == NULL) {
MALLOC(fip, struct fifoinfo *, sizeof(*fip), M_VNODE, M_WAITOK);
vp->v_fifoinfo = fip;
if ((error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0)) != 0) {
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_readsock = rso;
if ((error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0)) != 0) {
(void)soclose(rso);
free(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (error);
}
fip->fi_writesock = wso;
if ((error = unp_connect2(wso, rso)) != 0) {
(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_snd.sb_lowat = PIPE_BUF;
rso->so_state |= SS_CANTRCVMORE;
}
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(&fip->fi_writers);
}
}
if (ap->a_mode & FWRITE) {
fip->fi_writers++;
if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) {
error = ENXIO;
goto bad;
}
if (fip->fi_writers == 1) {
fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
if (fip->fi_readers > 0)
wakeup(&fip->fi_readers);
}
}
if ((ap->a_mode & O_NONBLOCK) == 0) {
if ((ap->a_mode & FREAD) && fip->fi_writers == 0) {
VOP_UNLOCK(vp, 0, p);
error = tsleep(&fip->fi_readers,
PCATCH | PSOCK, "fifor", 0);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (error)
goto bad;
}
if ((ap->a_mode & FWRITE) && fip->fi_readers == 0) {
VOP_UNLOCK(vp, 0, p);
error = tsleep(&fip->fi_writers,
PCATCH | PSOCK, "fifow", 0);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
if (error)
goto bad;
}
}
return (0);
bad:
VOP_CLOSE(vp, ap->a_mode, ap->a_cred, ap->a_p);
return (error);
}
/*
* Vnode op for read
*/
/* ARGSUSED */
int
fifo_read(void *v)
{
struct vop_read_args *ap = v;
struct uio *uio = ap->a_uio;
struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
struct proc *p = uio->uio_procp;
int error;
#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;
VOP_UNLOCK(ap->a_vp, 0, p);
error = soreceive(rso, NULL, uio, NULL, NULL, NULL);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
if (ap->a_ioflag & IO_NDELAY) {
rso->so_state &= ~SS_NBIO;
if (error == EWOULDBLOCK &&
ap->a_vp->v_fifoinfo->fi_writers == 0)
error = 0;
}
return (error);
}
/*
* Vnode op for write
*/
/* ARGSUSED */
int
fifo_write(void *v)
{
struct vop_write_args *ap = v;
struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
struct proc *p = ap->a_uio->uio_procp;
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, 0, p);
error = sosend(wso, NULL, ap->a_uio, NULL, NULL, 0);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
if (ap->a_ioflag & IO_NDELAY)
wso->so_state &= ~SS_NBIO;
return (error);
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
int
fifo_ioctl(void *v)
{
struct vop_ioctl_args *ap = v;
struct file filetmp;
int error;
if (ap->a_command == FIONBIO)
return (0);
if (ap->a_fflag & FREAD) {
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
if (error)
return (error);
}
if (ap->a_fflag & FWRITE) {
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
error = soo_ioctl(&filetmp, ap->a_command, ap->a_data, ap->a_p);
if (error)
return (error);
}
return (0);
}
/* ARGSUSED */
int
fifo_poll(void *v)
{
struct vop_poll_args *ap = v;
struct file filetmp;
short ostate;
int revents = 0;
if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
/*
* Socket and FIFO poll(2) semantics differ wrt EOF on read.
* Unlike a normal socket, FIFOs don't care whether or not
* SS_CANTRCVMORE is set. To get the correct semantics we
* must clear SS_CANTRCVMORE from so_state temporarily.
*/
ostate = ap->a_vp->v_fifoinfo->fi_readsock->so_state;
if (ap->a_events & (POLLIN | POLLRDNORM))
ap->a_vp->v_fifoinfo->fi_readsock->so_state &=
~SS_CANTRCVMORE;
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_readsock;
if (filetmp.f_data)
revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
ap->a_vp->v_fifoinfo->fi_readsock->so_state = ostate;
}
if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
filetmp.f_data = ap->a_vp->v_fifoinfo->fi_writesock;
if (filetmp.f_data)
revents |= soo_poll(&filetmp, ap->a_events, ap->a_p);
}
return (revents);
}
int
fifo_inactive(void *v)
{
struct vop_inactive_args *ap = v;
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
return (0);
}
/*
* This is a noop, simply returning what one has been given.
*/
int
fifo_bmap(void *v)
{
struct vop_bmap_args *ap = v;
if (ap->a_vpp != NULL)
*ap->a_vpp = ap->a_vp;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
return (0);
}
/*
* Device close routine
*/
/* ARGSUSED */
int
fifo_close(void *v)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct fifoinfo *fip = vp->v_fifoinfo;
int error1 = 0, error2 = 0;
if (fip == NULL)
return (0);
if (ap->a_fflag & FREAD) {
if (--fip->fi_readers == 0)
socantsendmore(fip->fi_writesock);
}
if (ap->a_fflag & FWRITE) {
if (--fip->fi_writers == 0)
socantrcvmore(fip->fi_readsock);
}
if (fip->fi_readers == 0 && fip->fi_writers == 0) {
error1 = soclose(fip->fi_readsock);
error2 = soclose(fip->fi_writesock);
FREE(fip, M_VNODE);
vp->v_fifoinfo = NULL;
}
return (error1 ? error1 : error2);
}
int
fifo_reclaim(void *v)
{
struct vop_reclaim_args *ap = v;
struct vnode *vp = ap->a_vp;
struct fifoinfo *fip = vp->v_fifoinfo;
if (fip == NULL)
return (0);
soclose(fip->fi_readsock);
soclose(fip->fi_writesock);
FREE(fip, M_VNODE);
vp->v_fifoinfo = NULL;
return (0);
}
/*
* Print out the contents of a fifo vnode.
*/
int
fifo_print(void *v)
{
struct vop_print_args *ap = v;
printf("tag VT_NON");
fifo_printinfo(ap->a_vp);
printf("\n");
return 0;
}
/*
* Print out internal contents of a fifo vnode.
*/
void
fifo_printinfo(struct vnode *vp)
{
struct fifoinfo *fip = vp->v_fifoinfo;
printf(", fifo with %ld readers and %ld writers",
fip->fi_readers, fip->fi_writers);
}
/*
* Return POSIX pathconf information applicable to fifo's.
*/
int
fifo_pathconf(void *v)
{
struct vop_pathconf_args *ap = v;
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
*/
/*ARGSUSED*/
int
fifo_ebadf(void *v)
{
return (EBADF);
}
/*
* Fifo advisory byte-level locks.
*/
/* ARGSUSED */
int
fifo_advlock(void *v)
{
return (EOPNOTSUPP);
}
/*
* Fifo bad operation
*/
/*ARGSUSED*/
int
fifo_badop(void *v)
{
panic("fifo_badop called");
/* NOTREACHED */
return(0);
}
int
fifo_kqfilter(void *v)
{
struct vop_kqfilter_args *ap = v;
struct socket *so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock;
struct sockbuf *sb;
switch (ap->a_kn->kn_filter) {
case EVFILT_READ:
ap->a_kn->kn_fop = &fiforead_filtops;
sb = &so->so_rcv;
break;
case EVFILT_WRITE:
ap->a_kn->kn_fop = &fifowrite_filtops;
sb = &so->so_snd;
break;
default:
return (1);
}
ap->a_kn->kn_hook = so;
SLIST_INSERT_HEAD(&sb->sb_sel.si_note, ap->a_kn, kn_selnext);
sb->sb_flags |= SB_KNOTE;
return (0);
}
void
filt_fifordetach(struct knote *kn)
{
struct socket *so = (struct socket *)kn->kn_hook;
SLIST_REMOVE(&so->so_rcv.sb_sel.si_note, kn, knote, kn_selnext);
if (SLIST_EMPTY(&so->so_rcv.sb_sel.si_note))
so->so_rcv.sb_flags &= ~SB_KNOTE;
}
int
filt_fiforead(struct knote *kn, long hint)
{
struct socket *so = (struct socket *)kn->kn_hook;
kn->kn_data = so->so_rcv.sb_cc;
if (so->so_state & SS_CANTRCVMORE) {
kn->kn_flags |= EV_EOF;
return (1);
}
kn->kn_flags &= ~EV_EOF;
return (kn->kn_data > 0);
}
void
filt_fifowdetach(struct knote *kn)
{
struct socket *so = (struct socket *)kn->kn_hook;
SLIST_REMOVE(&so->so_snd.sb_sel.si_note, kn, knote, kn_selnext);
if (SLIST_EMPTY(&so->so_snd.sb_sel.si_note))
so->so_snd.sb_flags &= ~SB_KNOTE;
}
int
filt_fifowrite(struct knote *kn, long hint)
{
struct socket *so = (struct socket *)kn->kn_hook;
kn->kn_data = sbspace(&so->so_snd);
if (so->so_state & SS_CANTSENDMORE) {
kn->kn_flags |= EV_EOF;
return (1);
}
kn->kn_flags &= ~EV_EOF;
return (kn->kn_data >= so->so_snd.sb_lowat);
}