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-rw-r--r--sys/fs/fifofs/fifo_vnops.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/sys/fs/fifofs/fifo_vnops.c b/sys/fs/fifofs/fifo_vnops.c
new file mode 100644
index 0000000..b64f957
--- /dev/null
+++ b/sys/fs/fifofs/fifo_vnops.c
@@ -0,0 +1,536 @@
+/*
+ * 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. 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 8.10 (Berkeley) 5/27/95
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/unistd.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/vnode.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/filio.h>
+#include <sys/fcntl.h>
+#include <sys/file.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;
+};
+
+static int fifo_badop __P((void));
+static int fifo_print __P((struct vop_print_args *));
+static int fifo_lookup __P((struct vop_lookup_args *));
+static int fifo_open __P((struct vop_open_args *));
+static int fifo_close __P((struct vop_close_args *));
+static int fifo_read __P((struct vop_read_args *));
+static int fifo_write __P((struct vop_write_args *));
+static int fifo_ioctl __P((struct vop_ioctl_args *));
+static int fifo_poll __P((struct vop_poll_args *));
+static int fifo_inactive __P((struct vop_inactive_args *));
+static int fifo_bmap __P((struct vop_bmap_args *));
+static int fifo_pathconf __P((struct vop_pathconf_args *));
+static int fifo_advlock __P((struct vop_advlock_args *));
+
+
+vop_t **fifo_vnodeop_p;
+static struct vnodeopv_entry_desc fifo_vnodeop_entries[] = {
+ { &vop_default_desc, (vop_t *) vop_defaultop },
+ { &vop_access_desc, (vop_t *) vop_ebadf },
+ { &vop_advlock_desc, (vop_t *) fifo_advlock },
+ { &vop_bmap_desc, (vop_t *) fifo_bmap },
+ { &vop_close_desc, (vop_t *) fifo_close },
+ { &vop_create_desc, (vop_t *) fifo_badop },
+ { &vop_getattr_desc, (vop_t *) vop_ebadf },
+ { &vop_inactive_desc, (vop_t *) fifo_inactive },
+ { &vop_ioctl_desc, (vop_t *) fifo_ioctl },
+ { &vop_lease_desc, (vop_t *) vop_null },
+ { &vop_link_desc, (vop_t *) fifo_badop },
+ { &vop_lookup_desc, (vop_t *) fifo_lookup },
+ { &vop_mkdir_desc, (vop_t *) fifo_badop },
+ { &vop_mknod_desc, (vop_t *) fifo_badop },
+ { &vop_open_desc, (vop_t *) fifo_open },
+ { &vop_pathconf_desc, (vop_t *) fifo_pathconf },
+ { &vop_poll_desc, (vop_t *) fifo_poll },
+ { &vop_print_desc, (vop_t *) fifo_print },
+ { &vop_read_desc, (vop_t *) fifo_read },
+ { &vop_readdir_desc, (vop_t *) fifo_badop },
+ { &vop_readlink_desc, (vop_t *) fifo_badop },
+ { &vop_reallocblks_desc, (vop_t *) fifo_badop },
+ { &vop_reclaim_desc, (vop_t *) vop_null },
+ { &vop_remove_desc, (vop_t *) fifo_badop },
+ { &vop_rename_desc, (vop_t *) fifo_badop },
+ { &vop_rmdir_desc, (vop_t *) fifo_badop },
+ { &vop_setattr_desc, (vop_t *) vop_ebadf },
+ { &vop_symlink_desc, (vop_t *) fifo_badop },
+ { &vop_write_desc, (vop_t *) fifo_write },
+ { NULL, NULL }
+};
+static struct vnodeopv_desc fifo_vnodeop_opv_desc =
+ { &fifo_vnodeop_p, fifo_vnodeop_entries };
+
+VNODEOP_SET(fifo_vnodeop_opv_desc);
+
+int
+fifo_vnoperate(ap)
+ struct vop_generic_args /* {
+ struct vnodeop_desc *a_desc;
+ <other random data follows, presumably>
+ } */ *ap;
+{
+ return (VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, ap));
+}
+
+/*
+ * Trivial lookup routine that always fails.
+ */
+/* ARGSUSED */
+static 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 */
+static int
+fifo_open(ap)
+ struct vop_open_args /* {
+ struct vnode *a_vp;
+ int a_mode;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ 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;
+ error = socreate(AF_LOCAL, &rso, SOCK_STREAM, 0, ap->a_p);
+ if (error) {
+ free(fip, M_VNODE);
+ vp->v_fifoinfo = NULL;
+ return (error);
+ }
+ fip->fi_readsock = rso;
+ error = socreate(AF_LOCAL, &wso, SOCK_STREAM, 0, ap->a_p);
+ 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_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((caddr_t)&fip->fi_writers);
+ }
+ }
+ if (ap->a_mode & FWRITE) {
+ fip->fi_writers++;
+ if (fip->fi_writers == 1) {
+ fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
+ if (fip->fi_readers > 0)
+ wakeup((caddr_t)&fip->fi_readers);
+ }
+ }
+ if ((ap->a_mode & FREAD) && (ap->a_mode & O_NONBLOCK) == 0) {
+ while (fip->fi_writers == 0) {
+ VOP_UNLOCK(vp, 0, p);
+ error = tsleep((caddr_t)&fip->fi_readers,
+ PCATCH | PSOCK, "fifoor", 0);
+ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+ if (error)
+ goto bad;
+ }
+ }
+ if (ap->a_mode & FWRITE) {
+ if (ap->a_mode & O_NONBLOCK) {
+ if (fip->fi_readers == 0) {
+ error = ENXIO;
+ goto bad;
+ }
+ } else {
+ while (fip->fi_readers == 0) {
+ VOP_UNLOCK(vp, 0, p);
+ error = tsleep((caddr_t)&fip->fi_writers,
+ PCATCH | PSOCK, "fifoow", 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, p);
+ return (error);
+}
+
+/*
+ * Vnode op for read
+ */
+/* ARGSUSED */
+static int
+fifo_read(ap)
+ struct vop_read_args /* {
+ struct vnode *a_vp;
+ struct uio *a_uio;
+ int a_ioflag;
+ struct ucred *a_cred;
+ } */ *ap;
+{
+ struct uio *uio = ap->a_uio;
+ struct socket *rso = ap->a_vp->v_fifoinfo->fi_readsock;
+ struct proc *p = uio->uio_procp;
+ 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, 0, p);
+ error = soreceive(rso, (struct sockaddr **)0, uio, (struct mbuf **)0,
+ (struct mbuf **)0, (int *)0);
+ vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY, p);
+ if (ap->a_ioflag & IO_NDELAY)
+ rso->so_state &= ~SS_NBIO;
+ return (error);
+}
+
+/*
+ * Vnode op for write
+ */
+/* ARGSUSED */
+static 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;
+ 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, (struct sockaddr *)0, ap->a_uio, 0,
+ (struct mbuf *)0, 0, p);
+ 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 */
+static 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;
+ int error;
+
+ if (ap->a_command == FIONBIO)
+ return (0);
+ if (ap->a_fflag & FREAD) {
+ filetmp.f_data = (caddr_t)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 = (caddr_t)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 */
+static int
+fifo_poll(ap)
+ struct vop_poll_args /* {
+ struct vnode *a_vp;
+ int a_events;
+ struct ucred *a_cred;
+ struct proc *a_p;
+ } */ *ap;
+{
+ struct file filetmp;
+ int revents = 0;
+
+ if (ap->a_events & (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND)) {
+ filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_readsock;
+ if (filetmp.f_data)
+ revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
+ ap->a_p);
+ }
+ if (ap->a_events & (POLLOUT | POLLWRNORM | POLLWRBAND)) {
+ filetmp.f_data = (caddr_t)ap->a_vp->v_fifoinfo->fi_writesock;
+ if (filetmp.f_data)
+ revents |= soo_poll(&filetmp, ap->a_events, ap->a_cred,
+ ap->a_p);
+ }
+ return (revents);
+}
+
+static int
+fifo_inactive(ap)
+ struct vop_inactive_args /* {
+ struct vnode *a_vp;
+ struct proc *a_p;
+ } */ *ap;
+{
+
+ VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
+ return (0);
+}
+
+/*
+ * This is a noop, simply returning what one has been given.
+ */
+static 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);
+}
+
+/*
+ * Device close routine
+ */
+/* ARGSUSED */
+static 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 & FREAD) {
+ fip->fi_readers--;
+ if (fip->fi_readers == 0)
+ socantsendmore(fip->fi_writesock);
+ }
+ if (ap->a_fflag & FWRITE) {
+ fip->fi_writers--;
+ if (fip->fi_writers == 0)
+ socantrcvmore(fip->fi_readsock);
+ }
+ 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 advisory byte-level locks.
+ */
+/* ARGSUSED */
+static 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 (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
+}
+
+/*
+ * Fifo bad operation
+ */
+static int
+fifo_badop()
+{
+
+ panic("fifo_badop called");
+ /* NOTREACHED */
+}
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