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fifo_vnops.c
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fifo_vnops.c
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/* $NetBSD: fifo_vnops.c,v 1.91 2021/10/11 01:07:36 thorpej Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1990, 1993, 1995
* 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 8.10 (Berkeley) 5/27/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fifo_vnops.c,v 1.91 2021/10/11 01:07:36 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/time.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <sys/event.h>
#include <sys/condvar.h>
#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.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;
kcondvar_t fi_rcv;
int fi_readers;
kcondvar_t fi_wcv;
int fi_writers;
};
/*
* Trivial lookup routine that always fails.
*/
/* ARGSUSED */
static int
fifo_lookup(void *v)
{
struct vop_lookup_v2_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *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.
*/
static int
fifo_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
struct lwp *l = curlwp;
struct vnode *vp;
struct fifoinfo *fip;
struct socket *rso, *wso;
int error;
vp = ap->a_vp;
KASSERT(VOP_ISLOCKED(vp));
if ((fip = vp->v_fifoinfo) == NULL) {
fip = kmem_alloc(sizeof(*fip), KM_SLEEP);
error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, l, NULL);
if (error != 0) {
kmem_free(fip, sizeof(*fip));
return (error);
}
fip->fi_readsock = rso;
error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, l, rso);
if (error != 0) {
(void)soclose(rso);
kmem_free(fip, sizeof(*fip));
return (error);
}
fip->fi_writesock = wso;
solock(wso);
if ((error = unp_connect2(wso, rso)) != 0) {
sounlock(wso);
(void)soclose(wso);
(void)soclose(rso);
kmem_free(fip, sizeof(*fip));
return (error);
}
/*
* FIFOs must be readable when there is at least 1
* byte of data available in the receive buffer.
*
* FIFOs must be writable when there is space for
* at least PIPE_BUF bytes in the send buffer.
* If we're increasing the low water mark for the
* send buffer, then mimic how soreserve() would
* have set the high water mark.
*/
rso->so_rcv.sb_lowat = 1;
if (wso->so_snd.sb_lowat < PIPE_BUF) {
wso->so_snd.sb_hiwat = PIPE_BUF * 2;
}
wso->so_snd.sb_lowat = PIPE_BUF;
fip->fi_readers = 0;
fip->fi_writers = 0;
wso->so_state |= SS_CANTRCVMORE;
rso->so_state |= SS_CANTSENDMORE;
cv_init(&fip->fi_rcv, "fiford");
cv_init(&fip->fi_wcv, "fifowr");
vp->v_fifoinfo = fip;
} else {
wso = fip->fi_writesock;
rso = fip->fi_readsock;
solock(wso);
}
if (ap->a_mode & FREAD) {
if (fip->fi_readers++ == 0) {
wso->so_state &= ~SS_CANTSENDMORE;
cv_broadcast(&fip->fi_wcv);
}
}
if (ap->a_mode & FWRITE) {
if (fip->fi_writers++ == 0) {
rso->so_state &= ~SS_CANTRCVMORE;
cv_broadcast(&fip->fi_rcv);
}
}
if (ap->a_mode & FREAD) {
if (ap->a_mode & O_NONBLOCK) {
} else {
while (!soreadable(rso) && fip->fi_writers == 0) {
VOP_UNLOCK(vp);
error = cv_wait_sig(&fip->fi_rcv,
wso->so_lock);
sounlock(wso);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error)
goto bad;
solock(wso);
}
}
}
if (ap->a_mode & FWRITE) {
if (ap->a_mode & O_NONBLOCK) {
if (fip->fi_readers == 0) {
error = ENXIO;
sounlock(wso);
goto bad;
}
} else {
while (fip->fi_readers == 0) {
VOP_UNLOCK(vp);
error = cv_wait_sig(&fip->fi_wcv,
wso->so_lock);
sounlock(wso);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error)
goto bad;
solock(wso);
}
}
}
sounlock(wso);
return (0);
bad:
VOP_CLOSE(vp, ap->a_mode, ap->a_cred);
return (error);
}
/*
* Vnode op for read
*/
/* ARGSUSED */
static int
fifo_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct uio *uio;
struct socket *rso;
int error, sflags;
size_t startresid;
uio = ap->a_uio;
rso = ap->a_vp->v_fifoinfo->fi_readsock;
#ifdef DIAGNOSTIC
if (uio->uio_rw != UIO_READ)
panic("fifo_read mode");
#endif
if (uio->uio_resid == 0)
return (0);
startresid = uio->uio_resid;
VOP_UNLOCK(ap->a_vp);
sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0;
error = (*rso->so_receive)(rso, NULL, uio, NULL, NULL, &sflags);
/*
* Clear EOF indication after first such return.
*/
if (error == 0 && uio->uio_resid == startresid)
rso->so_state &= ~SS_CANTRCVMORE;
if (ap->a_ioflag & IO_NDELAY) {
if (error == EWOULDBLOCK &&
ap->a_vp->v_fifoinfo->fi_writers == 0)
error = 0;
}
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
/*
* Vnode op for write
*/
/* ARGSUSED */
static int
fifo_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
struct socket *wso;
int error, sflags;
wso = ap->a_vp->v_fifoinfo->fi_writesock;
#ifdef DIAGNOSTIC
if (ap->a_uio->uio_rw != UIO_WRITE)
panic("fifo_write mode");
#endif
VOP_UNLOCK(ap->a_vp);
sflags = (ap->a_ioflag & IO_NDELAY) ? MSG_NBIO : 0;
error = (*wso->so_send)(wso, NULL, ap->a_uio, 0, NULL, sflags, curlwp);
vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY);
return (error);
}
/*
* Device ioctl operation.
*/
/* ARGSUSED */
static int
fifo_ioctl(void *v)
{
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
void *a_data;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *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);
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);
if (error)
return (error);
}
return (0);
}
/* ARGSUSED */
static int
fifo_poll(void *v)
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
} */ *ap = v;
struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
struct socket *wso = ap->a_vp->v_fifoinfo->fi_writesock;
struct socket *lso = NULL;
int events;
/*
* N.B. We're using a slightly different naming convention
* for these variables that most poll handlers.
*/
int revents = 0;
int wevents = 0;
if (rso != NULL) {
lso = rso;
} else if (wso != NULL) {
lso = wso;
}
if (lso == NULL) {
/* No associated sockets -> no events to report. */
return 0;
}
KASSERT(rso == NULL || lso->so_lock == rso->so_lock);
KASSERT(wso == NULL || lso->so_lock == wso->so_lock);
solock(lso);
if (rso != NULL) {
events = ap->a_events & (POLLIN | POLLRDNORM);
if (events != 0 && soreadable(rso)) {
revents |= events;
}
if (rso->so_state & SS_CANTRCVMORE) {
revents |= POLLHUP;
}
/*
* We always selrecord the read side here regardless
* of the caller's read interest because we need to
* action POLLHUP.
*/
if (revents == 0) {
selrecord(curlwp, &rso->so_rcv.sb_sel);
rso->so_rcv.sb_flags |= SB_NOTIFY;
}
}
/* POSIX sez: POLLHUP and POLLOUT are mutually-exclusive. */
if (wso != NULL && (revents & POLLHUP) == 0) {
events = ap->a_events & (POLLOUT | POLLWRNORM);
if (events != 0 && sowritable(wso)) {
wevents |= events;
}
if (wevents == 0 && events != 0) {
selrecord(curlwp, &wso->so_snd.sb_sel);
wso->so_snd.sb_flags |= SB_NOTIFY;
}
}
sounlock(lso);
return (revents | wevents);
}
static int
fifo_inactive(void *v)
{
struct vop_inactive_v2_args /* {
struct vnode *a_vp;
struct lwp *a_l;
} */ *ap __unused = v;
return (0);
}
/*
* This is a noop, simply returning what one has been given.
*/
static int
fifo_bmap(void *v)
{
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct vnode **a_vpp;
daddr_t *a_bnp;
int *a_runp;
} */ *ap = v;
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;
return (0);
}
/*
* This is like socantrcvmore(), but we send the POLL_HUP code.
*/
static void
fifo_socantrcvmore(struct socket *so)
{
KASSERT(solocked(so));
so->so_state |= SS_CANTRCVMORE;
if (sb_notify(&so->so_rcv)) {
sowakeup(so, &so->so_rcv, POLL_HUP);
}
}
/*
* Device close routine
*/
/* ARGSUSED */
static int
fifo_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp;
struct fifoinfo *fip;
struct socket *wso, *rso;
int isrevoke;
vp = ap->a_vp;
fip = vp->v_fifoinfo;
isrevoke = (ap->a_fflag & (FREAD | FWRITE | FNONBLOCK)) == FNONBLOCK;
wso = fip->fi_writesock;
rso = fip->fi_readsock;
solock(wso);
if (isrevoke) {
if (fip->fi_readers != 0) {
fip->fi_readers = 0;
socantsendmore(wso);
}
if (fip->fi_writers != 0) {
fip->fi_writers = 0;
fifo_socantrcvmore(rso);
}
} else {
if ((ap->a_fflag & FREAD) && --fip->fi_readers == 0)
socantsendmore(wso);
if ((ap->a_fflag & FWRITE) && --fip->fi_writers == 0)
fifo_socantrcvmore(rso);
}
if ((fip->fi_readers + fip->fi_writers) == 0) {
sounlock(wso);
(void) soclose(rso);
(void) soclose(wso);
cv_destroy(&fip->fi_rcv);
cv_destroy(&fip->fi_wcv);
kmem_free(fip, sizeof(*fip));
vp->v_fifoinfo = NULL;
} else
sounlock(wso);
return (0);
}
/*
* Print out internal contents of a fifo vnode.
*/
static void
fifo_printinfo(struct vnode *vp)
{
struct fifoinfo *fip;
fip = vp->v_fifoinfo;
printf(", fifo with %d readers and %d writers",
fip->fi_readers, fip->fi_writers);
}
/*
* Print out the contents of a fifo vnode.
*/
static int
fifo_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
/*
* We are most likely being called with the vnode belonging
* to some file system and this is not printed.
*/
if (ap->a_vp->v_tag == VT_NON)
printf("tag VT_NON");
fifo_printinfo(ap->a_vp);
printf("\n");
return 0;
}
/*
* Return POSIX pathconf information applicable to fifo's.
*/
static int
fifo_pathconf(void *v)
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *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);
case _PC_SYNC_IO:
*ap->a_retval = 1;
return (0);
default:
return genfs_pathconf(ap);
}
/* NOTREACHED */
}
static void
filt_fifordetach(struct knote *kn)
{
struct socket *so;
so = (struct socket *)kn->kn_hook;
solock(so);
if (selremove_knote(&so->so_rcv.sb_sel, kn))
so->so_rcv.sb_flags &= ~SB_KNOTE;
sounlock(so);
}
static int
filt_fiforead(struct knote *kn, long hint)
{
struct socket *so;
int rv;
so = (struct socket *)kn->kn_hook;
if (hint != NOTE_SUBMIT)
solock(so);
kn->kn_data = so->so_rcv.sb_cc;
if (so->so_state & SS_CANTRCVMORE) {
knote_set_eof(kn, 0);
rv = 1;
} else {
knote_clear_eof(kn);
rv = (kn->kn_data >= so->so_rcv.sb_lowat);
}
if (hint != NOTE_SUBMIT)
sounlock(so);
return rv;
}
static void
filt_fifowdetach(struct knote *kn)
{
struct socket *so;
so = (struct socket *)kn->kn_hook;
solock(so);
if (selremove_knote(&so->so_snd.sb_sel, kn))
so->so_snd.sb_flags &= ~SB_KNOTE;
sounlock(so);
}
static int
filt_fifowrite(struct knote *kn, long hint)
{
struct socket *so;
int rv;
so = (struct socket *)kn->kn_hook;
if (hint != NOTE_SUBMIT)
solock(so);
kn->kn_data = sbspace(&so->so_snd);
if (so->so_state & SS_CANTSENDMORE) {
knote_set_eof(kn, 0);
rv = 1;
} else {
knote_clear_eof(kn);
rv = (kn->kn_data >= so->so_snd.sb_lowat);
}
if (hint != NOTE_SUBMIT)
sounlock(so);
return rv;
}
static const struct filterops fiforead_filtops = {
.f_flags = FILTEROP_ISFD | FILTEROP_MPSAFE,
.f_attach = NULL,
.f_detach = filt_fifordetach,
.f_event = filt_fiforead,
};
static const struct filterops fifowrite_filtops = {
.f_flags = FILTEROP_ISFD | FILTEROP_MPSAFE,
.f_attach = NULL,
.f_detach = filt_fifowdetach,
.f_event = filt_fifowrite,
};
/* ARGSUSED */
static int
fifo_kqfilter(void *v)
{
struct vop_kqfilter_args /* {
struct vnode *a_vp;
struct knote *a_kn;
} */ *ap = v;
struct socket *so;
struct sockbuf *sb;
switch (ap->a_kn->kn_filter) {
case EVFILT_READ:
so = (struct socket *)ap->a_vp->v_fifoinfo->fi_readsock;
ap->a_kn->kn_fop = &fiforead_filtops;
sb = &so->so_rcv;
break;
case EVFILT_WRITE:
so = (struct socket *)ap->a_vp->v_fifoinfo->fi_writesock;
ap->a_kn->kn_fop = &fifowrite_filtops;
sb = &so->so_snd;
break;
default:
return (EINVAL);
}
ap->a_kn->kn_hook = so;
solock(so);
selrecord_knote(&sb->sb_sel, ap->a_kn);
sb->sb_flags |= SB_KNOTE;
sounlock(so);
return (0);
}
int (**fifo_vnodeop_p)(void *);
const struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_parsepath_desc, genfs_parsepath }, /* parsepath */
{ &vop_lookup_desc, fifo_lookup }, /* lookup */
{ &vop_create_desc, genfs_badop }, /* create */
{ &vop_mknod_desc, genfs_badop }, /* mknod */
{ &vop_open_desc, fifo_open }, /* open */
{ &vop_close_desc, fifo_close }, /* close */
{ &vop_access_desc, genfs_ebadf }, /* access */
{ &vop_accessx_desc, genfs_accessx }, /* accessx */
{ &vop_getattr_desc, genfs_ebadf }, /* getattr */
{ &vop_setattr_desc, genfs_ebadf }, /* setattr */
{ &vop_read_desc, fifo_read }, /* read */
{ &vop_write_desc, fifo_write }, /* write */
{ &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */
{ &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */
{ &vop_ioctl_desc, fifo_ioctl }, /* ioctl */
{ &vop_poll_desc, fifo_poll }, /* poll */
{ &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, genfs_revoke }, /* revoke */
{ &vop_mmap_desc, genfs_badop }, /* mmap */
{ &vop_fsync_desc, genfs_nullop }, /* fsync */
{ &vop_seek_desc, genfs_badop }, /* seek */
{ &vop_remove_desc, genfs_badop }, /* remove */
{ &vop_link_desc, genfs_badop }, /* link */
{ &vop_rename_desc, genfs_badop }, /* rename */
{ &vop_mkdir_desc, genfs_badop }, /* mkdir */
{ &vop_rmdir_desc, genfs_badop }, /* rmdir */
{ &vop_symlink_desc, genfs_badop }, /* symlink */
{ &vop_readdir_desc, genfs_badop }, /* readdir */
{ &vop_readlink_desc, genfs_badop }, /* readlink */
{ &vop_abortop_desc, genfs_badop }, /* abortop */
{ &vop_inactive_desc, fifo_inactive }, /* inactive */
{ &vop_reclaim_desc, genfs_nullop }, /* reclaim */
{ &vop_lock_desc, genfs_lock }, /* lock */
{ &vop_unlock_desc, genfs_unlock }, /* unlock */
{ &vop_bmap_desc, fifo_bmap }, /* bmap */
{ &vop_strategy_desc, genfs_badop }, /* strategy */
{ &vop_print_desc, fifo_print }, /* print */
{ &vop_islocked_desc, genfs_islocked }, /* islocked */
{ &vop_pathconf_desc, fifo_pathconf }, /* pathconf */
{ &vop_advlock_desc, genfs_einval }, /* advlock */
{ &vop_bwrite_desc, genfs_nullop }, /* bwrite */
{ &vop_putpages_desc, genfs_null_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc fifo_vnodeop_opv_desc =
{ &fifo_vnodeop_p, fifo_vnodeop_entries };