initial import of NetBSD tree

1 files changed, 294 insertions, 0 deletions

diff --git a/sys/miscfs/fdesc/fdesc_vfsops.c b/sys/miscfs/fdesc/fdesc_vfsops.c
new file mode 100644
index 00000000000..3d3ee6b6869
--- /dev/null
+++ b/sys/miscfs/fdesc/fdesc_vfsops.c
@@ -0,0 +1,294 @@
+/*	$NetBSD: fdesc_vfsops.c,v 1.20 1995/06/18 14:47:22 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1992, 1993
+ *	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. 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.
+ *
+ *	@(#)fdesc_vfsops.c	8.4 (Berkeley) 1/21/94
+ *
+ * #Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp #
+ */
+
+/*
+ * /dev/fd Filesystem
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/filedesc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/malloc.h>
+#include <miscfs/fdesc/fdesc.h>
+
+/*
+ * Mount the per-process file descriptors (/dev/fd)
+ */
+int
+fdesc_mount(mp, path, data, ndp, p)
+	struct mount *mp;
+	char *path;
+	caddr_t data;
+	struct nameidata *ndp;
+	struct proc *p;
+{
+	int error = 0;
+	size_t size;
+	struct fdescmount *fmp;
+	struct vnode *rvp;
+
+	/*
+	 * Update is a no-op
+	 */
+	if (mp->mnt_flag & MNT_UPDATE)
+		return (EOPNOTSUPP);
+
+	error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
+	if (error)
+		return (error);
+
+	MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
+				M_UFSMNT, M_WAITOK);	/* XXX */
+	rvp->v_type = VDIR;
+	rvp->v_flag |= VROOT;
+	fmp->f_root = rvp;
+	mp->mnt_flag |= MNT_LOCAL;
+	mp->mnt_data = (qaddr_t)fmp;
+	getnewfsid(mp, makefstype(MOUNT_FDESC));
+
+	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
+	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
+	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
+	bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
+	return (0);
+}
+
+int
+fdesc_start(mp, flags, p)
+	struct mount *mp;
+	int flags;
+	struct proc *p;
+{
+	return (0);
+}
+
+int
+fdesc_unmount(mp, mntflags, p)
+	struct mount *mp;
+	int mntflags;
+	struct proc *p;
+{
+	int error;
+	int flags = 0;
+	extern int doforce;
+	struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
+
+	if (mntflags & MNT_FORCE) {
+		/* fdesc can never be rootfs so don't check for it */
+		if (!doforce)
+			return (EINVAL);
+		flags |= FORCECLOSE;
+	}
+
+	/*
+	 * Clear out buffer cache.  I don't think we
+	 * ever get anything cached at this level at the
+	 * moment, but who knows...
+	 */
+	if (rootvp->v_usecount > 1)
+		return (EBUSY);
+	if (error = vflush(mp, rootvp, flags))
+		return (error);
+
+	/*
+	 * Release reference on underlying root vnode
+	 */
+	vrele(rootvp);
+	/*
+	 * And blow it away for future re-use
+	 */
+	vgone(rootvp);
+	/*
+	 * Finally, throw away the fdescmount structure
+	 */
+	free(mp->mnt_data, M_UFSMNT);	/* XXX */
+	mp->mnt_data = 0;
+
+	return (0);
+}
+
+int
+fdesc_root(mp, vpp)
+	struct mount *mp;
+	struct vnode **vpp;
+{
+	struct vnode *vp;
+
+	/*
+	 * Return locked reference to root.
+	 */
+	vp = VFSTOFDESC(mp)->f_root;
+	VREF(vp);
+	VOP_LOCK(vp);
+	*vpp = vp;
+	return (0);
+}
+
+int
+fdesc_quotactl(mp, cmd, uid, arg, p)
+	struct mount *mp;
+	int cmd;
+	uid_t uid;
+	caddr_t arg;
+	struct proc *p;
+{
+
+	return (EOPNOTSUPP);
+}
+
+int
+fdesc_statfs(mp, sbp, p)
+	struct mount *mp;
+	struct statfs *sbp;
+	struct proc *p;
+{
+	struct filedesc *fdp;
+	int lim;
+	int i;
+	int last;
+	int freefd;
+
+	/*
+	 * Compute number of free file descriptors.
+	 * [ Strange results will ensue if the open file
+	 * limit is ever reduced below the current number
+	 * of open files... ]
+	 */
+	lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
+	fdp = p->p_fd;
+	last = min(fdp->fd_nfiles, lim);
+	freefd = 0;
+	for (i = fdp->fd_freefile; i < last; i++)
+		if (fdp->fd_ofiles[i] == NULL)
+			freefd++;
+
+	/*
+	 * Adjust for the fact that the fdesc array may not
+	 * have been fully allocated yet.
+	 */
+	if (fdp->fd_nfiles < lim)
+		freefd += (lim - fdp->fd_nfiles);
+
+#ifdef COMPAT_09
+	sbp->f_type = 6;
+#else
+	sbp->f_type = 0;
+#endif
+	sbp->f_bsize = 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_files = lim + 1;		/* Allow for "." */
+	sbp->f_ffree = freefd;		/* See comments above */
+	if (sbp != &mp->mnt_stat) {
+		bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
+		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
+		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
+	}
+	strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
+	return (0);
+}
+
+int
+fdesc_sync(mp, waitfor)
+	struct mount *mp;
+	int waitfor;
+{
+
+	return (0);
+}
+
+/*
+ * Fdesc flat namespace lookup.
+ * Currently unsupported.
+ */
+int
+fdesc_vget(mp, ino, vpp)
+	struct mount *mp;
+	ino_t ino;
+	struct vnode **vpp;
+{
+
+	return (EOPNOTSUPP);
+}
+
+int
+fdesc_fhtovp(mp, fhp, setgen, vpp)
+	struct mount *mp;
+	struct fid *fhp;
+	int setgen;
+	struct vnode **vpp;
+{
+	return (EOPNOTSUPP);
+}
+
+int
+fdesc_vptofh(vp, fhp)
+	struct vnode *vp;
+	struct fid *fhp;
+{
+
+	return (EOPNOTSUPP);
+}
+
+struct vfsops fdesc_vfsops = {
+	MOUNT_FDESC,
+	fdesc_mount,
+	fdesc_start,
+	fdesc_unmount,
+	fdesc_root,
+	fdesc_quotactl,
+	fdesc_statfs,
+	fdesc_sync,
+	fdesc_vget,
+	fdesc_fhtovp,
+	fdesc_vptofh,
+	fdesc_init,
+};