Remove all traces of Julians DEVFS (incl from kern/subr_diskslice.c)

  Remove old DEVFS support fields from dev_t.

  Make uid, gid & mode members of dev_t and set them in make_dev().

  Use correct uid, gid & mode in make_dev in disk minilayer.

  Add support for registering alias names for a dev_t using the
  new function make_dev_alias().  These will show up as symlinks
  in DEVFS.

  Use makedev() rather than make_dev() for MFSs magic devices to prevent
  DEVFS from noticing this abuse.

  Add a field for DEVFS inode number in dev_t.

  Add new DEVFS in fs/devfs.

  Add devfs cloning to:
        disk minilayer (ie: ad(4), sd(4), cd(4) etc etc)
        md(4), tun(4), bpf(4), fd(4)

  If DEVFS add -d flag to /sbin/inits args to make it mount devfs.

  Add commented out DEVFS to GENERIC

4 files changed, 1139 insertions, 0 deletions

diff --git a/sys/fs/devfs/devfs.h b/sys/fs/devfs/devfs.h
new file mode 100644
index 0000000..00a34b1
--- /dev/null
+++ b/sys/fs/devfs/devfs.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2000
+ *	Poul-Henning Kamp.  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. 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.
+ *
+ *	@(#)kernfs.h	8.6 (Berkeley) 3/29/95
+ * From: FreeBSD: src/sys/miscfs/kernfs/kernfs.h 1.14
+ *
+ * $FreeBSD$
+ */
+
+#ifdef _KERNEL
+
+#ifdef DEVFS_INTERN
+
+#define NDEVINO 1024
+
+MALLOC_DECLARE(M_DEVFS);
+
+struct devfs_dir {
+	TAILQ_HEAD(, devfs_dirent) dd_list;
+};
+
+struct devfs_dirent {
+	int	de_inode;
+	struct dirent *de_dirent;
+	TAILQ_ENTRY(devfs_dirent) de_list;
+	struct devfs_dir *de_dir;
+	mode_t	de_mode;
+	uid_t	de_uid;
+	gid_t	de_gid;
+	struct timespec de_atime;
+	struct timespec de_mtime;
+	struct timespec de_ctime;
+	struct vnode *de_vnode;
+	char *	de_symlink;
+};
+
+struct devfs_node {
+	struct kern_target *kf_kt;
+};
+
+struct devfs_mount {
+	struct vnode	*dm_root;	/* Root node */
+	struct devfs_dir *dm_rootdir;
+	struct devfs_dir *dm_basedir;
+	unsigned	dm_generation;
+	struct devfs_dirent *dm_dirent[NDEVINO];
+	int	dm_inode;
+};
+
+
+extern dev_t devfs_inot[NDEVINO];
+extern int devfs_nino;
+extern unsigned devfs_generation;
+
+#define VFSTODEVFS(mp)	((struct devfs_mount *)((mp)->mnt_data))
+
+extern vop_t **devfs_vnodeop_p;
+extern vop_t **devfs_specop_p;
+int devfs_populate __P((struct devfs_mount *dm));
+struct devfs_dir * devfs_vmkdir __P((void));
+struct devfs_dirent * devfs_newdirent __P((char *name, int namelen));
+void devfs_purge __P((struct devfs_dir *dd));
+void devfs_delete __P((struct devfs_dir *dd, struct devfs_dirent *de));
+#endif /* DEVFS_INTERN */
+
+typedef void (*devfs_clone_fn) __P((void *arg, char *name, int namelen, dev_t *result));
+
+int devfs_stdclone __P((char *name, char **namep, char *stem, int *unit));
+EVENTHANDLER_DECLARE(devfs_clone, devfs_clone_fn);
+#endif /* _KERNEL */
diff --git a/sys/fs/devfs/devfs_devs.c b/sys/fs/devfs/devfs_devs.c
new file mode 100644
index 0000000..4bcfc03
--- /dev/null
+++ b/sys/fs/devfs/devfs_devs.c
@@ -0,0 +1,230 @@
+#define DEBUG 1
+/*
+ * Copyright (c) 2000
+ *	Poul-Henning Kamp.  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. 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.
+ *
+ * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/dirent.h>
+#include <sys/conf.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/malloc.h>
+#include <sys/eventhandler.h>
+#include <sys/ctype.h>
+
+#define DEVFS_INTERN
+#include <fs/devfs/devfs.h>
+
+struct devfs_dirent *
+devfs_newdirent(char *name, int namelen)
+{
+	int i;
+	struct devfs_dirent *de;
+	struct dirent d;
+
+	d.d_namlen = namelen;
+	i = sizeof (*de) + GENERIC_DIRSIZ(&d);
+	MALLOC(de, struct devfs_dirent *, i, M_DEVFS, M_WAITOK);
+	bzero(de, i);
+	de->de_dirent = (struct dirent *)(de + 1);
+	de->de_dirent->d_namlen = namelen;
+	de->de_dirent->d_reclen = GENERIC_DIRSIZ(&d);
+	bcopy(name, de->de_dirent->d_name, namelen + 1);
+	nanotime(&de->de_ctime);
+	return (de);
+}
+
+struct devfs_dir *
+devfs_vmkdir(void)
+{
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+
+	MALLOC(dd, struct devfs_dir *, sizeof(*dd), M_DEVFS, M_WAITOK);
+	bzero(dd, sizeof(*dd));
+	TAILQ_INIT(&dd->dd_list);
+
+	de = devfs_newdirent(".", 1);
+	de->de_dirent->d_type = DT_DIR;
+	TAILQ_INSERT_TAIL(&dd->dd_list, de, de_list);
+	de = TAILQ_FIRST(&dd->dd_list);
+	de->de_mode = 0755;
+	return (dd);
+}
+
+void
+devfs_delete(struct devfs_dir *dd, struct devfs_dirent *de)
+{
+
+	if (de->de_symlink) {
+		FREE(de->de_symlink, M_DEVFS);
+		de->de_symlink = NULL;
+	}
+	if (de->de_vnode) {
+		de->de_vnode->v_data = NULL;
+		vdrop(de->de_vnode);
+	}
+	TAILQ_REMOVE(&dd->dd_list, de, de_list);
+	FREE(de, M_DEVFS);
+}
+
+void
+devfs_purge(struct devfs_dir *dd)
+{
+	struct devfs_dirent *de;
+
+	for (;;) {
+		de = TAILQ_FIRST(&dd->dd_list);
+		if (de == NULL)
+			break;
+		devfs_delete(dd, de);
+	}
+	FREE(dd, M_DEVFS);
+}
+
+
+int
+devfs_populate(struct devfs_mount *dm)
+{
+	int i, j;
+	dev_t dev, pdev;
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+	char *q, *s;
+
+	while (dm->dm_generation != devfs_generation) {
+		dm->dm_generation = devfs_generation;
+		for (i = 0; i < NDEVINO; i++) {
+			dev = devfs_inot[i];
+			de = dm->dm_dirent[i];
+			if (dev == NULL && de != NULL) {
+#if 0
+				printf("Del ino%d %s\n", i, de->de_dirent->d_name);
+#endif
+				dd = de->de_dir;
+				dm->dm_dirent[i] = NULL;
+				TAILQ_REMOVE(&dd->dd_list, de, de_list);
+				if (de->de_vnode) {
+					de->de_vnode->v_data = NULL;
+					vdrop(de->de_vnode);
+				}
+				FREE(de, M_DEVFS);
+				continue;
+			}
+			if (dev == NULL)
+				continue;
+			if (de != NULL)
+				continue;
+			dd = dm->dm_basedir;
+			s = dev->si_name;
+			for (q = s; *q != '/' && *q != '\0'; q++)
+				continue;
+			if (*q == '/') {
+				continue;
+			}
+			de = devfs_newdirent(s, q - s);
+			if (dev->si_flags & SI_ALIAS) {
+				de->de_inode = dm->dm_inode++;
+				de->de_uid = 0;
+				de->de_gid = 0;
+				de->de_mode = 0642;
+				de->de_dirent->d_type = DT_LNK;
+				pdev = dev->si_drv1;
+				j = strlen(pdev->si_name) + 1;
+				MALLOC(de->de_symlink, char *, j, M_DEVFS, M_WAITOK);
+				bcopy(pdev->si_name, de->de_symlink, j);
+			} else {
+				de->de_inode = i;
+				de->de_uid = dev->si_uid;
+				de->de_gid = dev->si_gid;
+				de->de_mode = dev->si_mode;
+				de->de_dirent->d_type = DT_CHR;
+				dm->dm_dirent[i] = de;
+			}
+			TAILQ_INSERT_TAIL(&dd->dd_list, de, de_list);
+#if 0
+			printf("Add ino%d %s\n", i, dev->si_name);
+#endif
+		}
+	}
+	return (0);
+}
+
+dev_t devfs_inot[NDEVINO];
+int devfs_nino = 3;
+unsigned devfs_generation;
+
+static void
+devfs_create(dev_t dev)
+{
+	if (dev->si_inode == 0 && devfs_nino < NDEVINO)
+		dev->si_inode = devfs_nino++;
+	if (dev->si_inode == 0) {
+		printf("NDEVINO too small\n");
+		return;
+	}
+	devfs_inot[dev->si_inode] = dev;
+	devfs_generation++;
+}
+
+static void
+devfs_remove(dev_t dev)
+{
+	devfs_inot[dev->si_inode] = NULL;
+	devfs_generation++;
+}
+
+devfs_create_t *devfs_create_hook = devfs_create;
+devfs_remove_t *devfs_remove_hook = devfs_remove;
+
+int
+devfs_stdclone(char *name, char **namep, char *stem, int *unit)
+{
+	int u, i;
+
+	if (bcmp(stem, name, strlen(stem)) != 0)
+		return (0);
+	i = strlen(stem);
+	if (!isdigit(name[i]))
+		return (0);
+	u = 0;
+	while (isdigit(name[i])) {
+		u *= 10;
+		u += name[i++] - '0';
+	}
+	*unit = u;
+	if (namep)
+		*namep = &name[i];
+	if (name[i]) 
+		return (2);
+	return (1);
+}
diff --git a/sys/fs/devfs/devfs_vfsops.c b/sys/fs/devfs/devfs_vfsops.c
new file mode 100644
index 0000000..2cd7611
--- /dev/null
+++ b/sys/fs/devfs/devfs_vfsops.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 1992, 1993, 1995
+ *	The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2000
+ *	Poul-Henning Kamp.  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. 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.
+ *
+ *	@(#)kernfs_vfsops.c	8.10 (Berkeley) 5/14/95
+ * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/dirent.h>
+#include <sys/conf.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/malloc.h>
+#include <sys/eventhandler.h>
+
+#define DEVFS_INTERN
+#include <fs/devfs/devfs.h>
+
+MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
+
+static int	devfs_mount __P((struct mount *mp, char *path, caddr_t data,
+				  struct nameidata *ndp, struct proc *p));
+static int	devfs_unmount __P((struct mount *mp, int mntflags,
+				  struct proc *p));
+static int	devfs_root __P((struct mount *mp, struct vnode **vpp));
+static int	devfs_statfs __P((struct mount *mp, struct statfs *sbp,
+				   struct proc *p));
+
+/*
+ * Mount the filesystem
+ */
+static int
+devfs_mount(mp, path, data, ndp, p)
+	struct mount *mp;
+	char *path;
+	caddr_t data;
+	struct nameidata *ndp;
+	struct proc *p;
+{
+	int error = 0;
+	u_int size;
+	struct devfs_mount *fmp;
+	struct vnode *rvp;
+
+	/*
+	 * Update is a no-op
+	 */
+	if (mp->mnt_flag & MNT_UPDATE)
+		return (EOPNOTSUPP);
+
+	MALLOC(fmp, struct devfs_mount *, sizeof(struct devfs_mount), M_DEVFS, M_WAITOK);
+
+	bzero(fmp, sizeof(*fmp));
+
+	error = getnewvnode(VT_DEVFS, mp, devfs_vnodeop_p, &rvp);
+	if (error) {
+		FREE(fmp, M_DEVFS);
+		return (error);
+	}
+
+	vhold(rvp);
+	rvp->v_type = VDIR;
+	rvp->v_flag |= VROOT;
+	mp->mnt_flag |= MNT_LOCAL;
+	mp->mnt_data = (qaddr_t) fmp;
+	vfs_getnewfsid(mp);
+
+	fmp->dm_inode = NDEVINO;
+	fmp->dm_root = rvp;
+	fmp->dm_rootdir = devfs_vmkdir();
+	rvp->v_data = fmp->dm_rootdir;
+	TAILQ_FIRST(&fmp->dm_rootdir->dd_list)->de_vnode = rvp;
+	TAILQ_FIRST(&fmp->dm_rootdir->dd_list)->de_inode = 2;
+
+#ifdef DEVFS_DEVBASE
+	{
+	struct devfs_dirent *de;
+
+	fmp->dm_basedir = devfs_vmkdir();
+	de = devfs_newdirent("dev", 3);
+	de->de_inode = fmp->dm_inode++;
+	de->de_dir = fmp->dm_basedir;
+	TAILQ_FIRST(&de->de_dir->dd_list)->de_inode = de->de_inode;
+	de->de_uid = 0;
+	de->de_gid = 0;
+	de->de_mode = 0755;
+	de->de_dirent->d_type = DT_DIR;
+	TAILQ_INSERT_TAIL(&fmp->dm_rootdir->dd_list, de, de_list);
+	}
+#else
+	fmp->dm_basedir = fmp->dm_rootdir;
+#endif
+
+	if (path != NULL) {
+		(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
+	} else {
+		strcpy(mp->mnt_stat.f_mntonname, "/");
+		size = 1;
+	}
+	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
+	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
+	bcopy("devfs", mp->mnt_stat.f_mntfromname, sizeof("devfs"));
+	(void)devfs_statfs(mp, &mp->mnt_stat, p);
+	devfs_populate(fmp);
+
+	return (0);
+}
+
+static int
+devfs_unmount(mp, mntflags, p)
+	struct mount *mp;
+	int mntflags;
+	struct proc *p;
+{
+	int error;
+	int flags = 0;
+	struct vnode *rootvp = VFSTODEVFS(mp)->dm_root;
+	struct devfs_mount *fmp;
+
+	fmp = (struct devfs_mount*) mp->mnt_data;
+	if (mntflags & MNT_FORCE)
+		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 > 2)
+		return (EBUSY);
+	devfs_purge(fmp->dm_rootdir);
+	error = vflush(mp, rootvp, flags);
+	if (error)
+		return (error);
+
+	/*
+	 * Release reference on underlying root vnode
+	 */
+	vrele(rootvp);
+	/*
+	 * And blow it away for future re-use
+	 */
+	vgone(rootvp);
+	/*
+	 * Finally, throw away the devfs_mount structure
+	 */
+	free(mp->mnt_data, M_DEVFS);
+	mp->mnt_data = 0;
+	return 0;
+}
+
+static int
+devfs_root(mp, vpp)
+	struct mount *mp;
+	struct vnode **vpp;
+{
+	struct proc *p = curproc;	/* XXX */
+	struct vnode *vp;
+
+	/*
+	 * Return locked reference to root.
+	 */
+	vp = VFSTODEVFS(mp)->dm_root;
+	VREF(vp);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	*vpp = vp;
+	return (0);
+}
+
+static int
+devfs_statfs(mp, sbp, p)
+	struct mount *mp;
+	struct statfs *sbp;
+	struct proc *p;
+{
+
+	sbp->f_flags = 0;
+	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 = 0;
+	sbp->f_ffree = 0;
+	if (sbp != &mp->mnt_stat) {
+		sbp->f_type = mp->mnt_vfc->vfc_typenum;
+		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);
+	}
+	return (0);
+}
+
+static struct vfsops devfs_vfsops = {
+	devfs_mount,
+	vfs_stdstart,
+	devfs_unmount,
+	devfs_root,
+	vfs_stdquotactl,
+	devfs_statfs,
+	vfs_stdsync,
+	vfs_stdvget,
+	vfs_stdfhtovp,
+	vfs_stdcheckexp,
+	vfs_stdvptofh,
+	vfs_stdinit,
+	vfs_stduninit,
+	vfs_stdextattrctl,
+};
+
+VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
new file mode 100644
index 0000000..fb14abf
--- /dev/null
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -0,0 +1,569 @@
+#define DEBUG 1
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2000
+ *	Poul-Henning Kamp.  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. 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.
+ *
+ *	@(#)kernfs_vnops.c	8.15 (Berkeley) 5/21/95
+ * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/vmmeter.h>
+#include <sys/time.h>
+#include <sys/conf.h>
+#include <sys/vnode.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/dirent.h>
+#include <sys/resource.h>
+#include <sys/eventhandler.h>
+
+#define DEVFS_INTERN
+#include <fs/devfs/devfs.h>
+
+#define KSTRING	256		/* Largest I/O available via this filesystem */
+#define	UIO_MX 32
+
+static int	devfs_access __P((struct vop_access_args *ap));
+static int	devfs_badop __P((void));
+static int	devfs_getattr __P((struct vop_getattr_args *ap));
+static int	devfs_lookup __P((struct vop_lookup_args *ap));
+static int	devfs_print __P((struct vop_print_args *ap));
+static int	devfs_readdir __P((struct vop_readdir_args *ap));
+static int	devfs_readlink __P((struct vop_readlink_args *ap));
+static int	devfs_reclaim __P((struct vop_reclaim_args *ap));
+static int	devfs_remove __P((struct vop_remove_args *ap));
+static int	devfs_revoke __P((struct vop_revoke_args *ap));
+static int	devfs_setattr __P((struct vop_setattr_args *ap));
+static int	devfs_symlink __P((struct vop_symlink_args *ap));
+
+
+static int
+devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct proc *p)
+{
+	int error;
+	struct vnode *vp;
+
+loop:
+	vp = de->de_vnode;
+	if (vp != NULL) {
+		if (vget(vp, 0, p ? p : curproc))
+			goto loop;
+		*vpp = vp;
+		return (0);
+	}
+	error = getnewvnode(VT_DEVFS, mp, devfs_vnodeop_p, &vp);
+	if (error != 0) {
+		printf("devfs_allocv: failed to allocate new vnode\n");
+		return (error);
+	}
+
+	if (de->de_dirent->d_type == DT_CHR) {
+		vp->v_type = VCHR;
+		vp = addaliasu(vp, devfs_inot[de->de_inode]->si_udev);
+		vp->v_op = devfs_specop_p;
+		vp->v_data = de;
+	} else if (de->de_dirent->d_type == DT_DIR) {
+		vp->v_type = VDIR;
+		vp->v_data = de->de_dir;
+		TAILQ_FIRST(&de->de_dir->dd_list)->de_vnode = vp;
+	} else if (de->de_dirent->d_type == DT_LNK) {
+		vp->v_type = VLNK;
+		vp->v_data = de;
+	} else {
+		vp->v_type = VBAD;
+		vp->v_data = de;
+	}
+	de->de_vnode = vp;
+	vhold(vp);
+	*vpp = vp;
+	return (0);
+}
+/*
+ * vp is the current namei directory
+ * ndp is the name to locate in that directory...
+ */
+static int
+devfs_lookup(ap)
+	struct vop_lookup_args /* {
+		struct vnode * a_dvp;
+		struct vnode ** a_vpp;
+		struct componentname * a_cnp;
+	} */ *ap;
+{
+	struct componentname *cnp = ap->a_cnp;
+	struct vnode **vpp = ap->a_vpp;
+	struct vnode *dvp = ap->a_dvp;
+	char *pname = cnp->cn_nameptr;
+	struct proc *p = cnp->cn_proc;
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+	struct devfs_mount *fmp;
+	dev_t cdev;
+	int error, cloned;
+
+	*vpp = NULLVP;
+
+	VOP_UNLOCK(dvp, 0, p);
+	if (cnp->cn_namelen == 1 && *pname == '.') {
+		*vpp = dvp;
+		VREF(dvp);
+		vn_lock(dvp, LK_SHARED | LK_RETRY, p);
+		return (0);
+	}
+
+	cloned = 0;
+
+	fmp = (struct devfs_mount *)dvp->v_mount->mnt_data;
+again:
+
+	devfs_populate(fmp);
+	dd = dvp->v_data;
+	TAILQ_FOREACH(de, &dd->dd_list, de_list) {
+		if (cnp->cn_namelen != de->de_dirent->d_namlen)
+			continue;
+		if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name, de->de_dirent->d_namlen) != 0)
+			continue;
+		goto found;
+	}
+
+	if (!cloned) {
+		/* OK, we didn't have that one, so lets try to create it on the fly... */
+		cdev = NODEV;
+		EVENTHANDLER_INVOKE(devfs_clone, cnp->cn_nameptr, cnp->cn_namelen, &cdev);
+#if 0
+		printf("cloned %s -> %p %s\n", cnp->cn_nameptr, cdev,
+		    cdev == NODEV ? "NODEV" : cdev->si_name);
+#endif
+		if (cdev != NODEV) {
+			cloned = 1;
+			goto again;
+		}
+	}
+
+	/* No luck, too bad. */
+
+	if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) &&
+	    (cnp->cn_flags & ISLASTCN)) {
+		cnp->cn_flags |= SAVENAME;
+		if (!(cnp->cn_flags & LOCKPARENT))
+			VOP_UNLOCK(dvp, 0, p);
+		return (EJUSTRETURN);
+	} else {
+		vn_lock(dvp, LK_SHARED | LK_RETRY, p);
+		return (ENOENT);
+	}
+
+
+found:
+
+	error = devfs_allocv(de, dvp->v_mount, vpp, p);
+	if (error != 0) {
+		vn_lock(dvp, LK_SHARED | LK_RETRY, p);
+		return (error);
+	}
+	if ((cnp->cn_nameiop == DELETE) && (cnp->cn_flags & ISLASTCN)) {
+		if (*vpp == dvp) {
+			VREF(dvp);
+			*vpp = dvp;
+			return (0);
+		}
+		VREF(*vpp);
+		if (!(cnp->cn_flags & LOCKPARENT))
+			VOP_UNLOCK(dvp, 0, p);
+		return (0);
+	}
+	vn_lock(*vpp, LK_SHARED | LK_RETRY, p);
+	if (!(cnp->cn_flags & LOCKPARENT))
+		VOP_UNLOCK(dvp, 0, p);
+	return (0);
+}
+
+static int
+devfs_access(ap)
+	struct vop_access_args /* {
+		struct vnode *a_vp;
+		int  a_mode;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	mode_t amode = ap->a_mode;
+	struct devfs_dirent *de = vp->v_data;
+	mode_t fmode = de->de_mode;
+
+	/* Some files are simply not modifiable. */
+	if ((amode & VWRITE) && (fmode & (S_IWUSR|S_IWGRP|S_IWOTH)) == 0)
+		return (EPERM);
+
+	return (vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
+	    ap->a_mode, ap->a_cred));
+}
+
+static int
+devfs_getattr(ap)
+	struct vop_getattr_args /* {
+		struct vnode *a_vp;
+		struct vattr *a_vap;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct vattr *vap = ap->a_vap;
+	int error = 0;
+	struct devfs_dirent *de;
+	struct devfs_dir *dd;
+
+	if (vp->v_type == VDIR) {
+		dd = vp->v_data;
+		de = TAILQ_FIRST(&dd->dd_list);
+	} else {
+		de = vp->v_data;
+	}
+	bzero((caddr_t) vap, sizeof(*vap));
+	vattr_null(vap);
+	vap->va_uid = de->de_uid;
+	vap->va_gid = de->de_gid;
+	vap->va_mode = de->de_mode;
+	vap->va_size = 0;
+	vap->va_blocksize = DEV_BSIZE;
+	vap->va_atime = de->de_atime;
+	vap->va_mtime = de->de_mtime;
+	vap->va_ctime = de->de_ctime;
+	vap->va_gen = 0;
+	vap->va_flags = 0;
+	vap->va_rdev = 0;
+	vap->va_bytes = 0;
+	vap->va_nlink = 1;
+	vap->va_fileid = de->de_inode;
+
+#if 0
+	if (vp->v_flag & VROOT) {
+#ifdef DEBUG
+		printf("devfs_getattr: stat rootdir\n");
+#endif
+		vap->va_type = VDIR;
+		vap->va_nlink = 2;
+		vap->va_fileid = 2;
+		vap->va_size = DEV_BSIZE;
+	} else
+#endif
+
+	if (de->de_dirent->d_type == DT_DIR) {
+		vap->va_type = VDIR;
+	} else if (de->de_dirent->d_type == DT_LNK) {
+		vap->va_type = VLNK;
+	} else if (de->de_dirent->d_type == DT_CHR) {
+		vap->va_type = VCHR;
+		vap->va_rdev = devfs_inot[de->de_inode]->si_udev;
+	}
+
+#ifdef DEBUG
+	if (error)
+		printf("devfs_getattr: return error %d\n", error);
+#endif
+	return (error);
+}
+
+static int
+devfs_setattr(ap)
+	struct vop_setattr_args /* {
+		struct vnode *a_vp;
+		struct vattr *a_vap;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+
+	if (ap->a_vp->v_type == VDIR) {
+		dd = ap->a_vp->v_data;
+		de = TAILQ_FIRST(&dd->dd_list);
+	} else {
+		de = ap->a_vp->v_data;
+	}
+
+	if (ap->a_vap->va_flags != VNOVAL)
+		return (EOPNOTSUPP);
+	if (ap->a_vap->va_uid != (uid_t)VNOVAL)
+		de->de_uid = ap->a_vap->va_uid;
+	if (ap->a_vap->va_gid != (gid_t)VNOVAL)
+		de->de_gid = ap->a_vap->va_gid;
+	if (ap->a_vap->va_mode != (mode_t)VNOVAL)
+		de->de_mode = ap->a_vap->va_mode;
+	if (ap->a_vap->va_atime.tv_sec != VNOVAL)
+		de->de_atime = ap->a_vap->va_atime;
+	if (ap->a_vap->va_mtime.tv_sec != VNOVAL)
+		de->de_mtime = ap->a_vap->va_mtime;
+
+	/*
+	 * Silently ignore attribute changes.
+	 * This allows for open with truncate to have no
+	 * effect until some data is written.  I want to
+	 * do it this way because all writes are atomic.
+	 */
+	return (0);
+}
+
+static int
+devfs_readdir(ap)
+	struct vop_readdir_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		struct ucred *a_cred;
+		int *a_eofflag;
+		int *a_ncookies;
+		u_long **a_cookies;
+	} */ *ap;
+{
+	int error, i;
+	struct uio *uio = ap->a_uio;
+	struct dirent *dp;
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+	off_t off;
+
+	if (ap->a_vp->v_type != VDIR)
+		return (ENOTDIR);
+
+	i = (u_int)off / UIO_MX;
+	error = 0;
+	dd = ap->a_vp->v_data;
+	de = TAILQ_FIRST(&dd->dd_list);
+	off = 0;
+	while (uio->uio_resid >= UIO_MX && de != NULL) {
+		dp = de->de_dirent;
+		dp->d_fileno = de->de_inode;
+		if (off >= uio->uio_offset)
+			if ((error = uiomove((caddr_t)dp, dp->d_reclen, uio)) != 0)
+				break;
+		off += dp->d_reclen;
+		de = TAILQ_NEXT(de, de_list);
+	}
+
+	uio->uio_offset = off;
+
+	return (error);
+}
+
+static int
+devfs_readlink(ap)
+	struct vop_readlink_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		struct ucred *a_cead;
+	} */ *ap;
+{
+	int error;
+	struct devfs_dirent *de;
+
+	de = ap->a_vp->v_data;
+	error = uiomove(de->de_symlink, strlen(de->de_symlink) + 1, ap->a_uio);
+	return (error);
+}
+
+static int
+devfs_reclaim(ap)
+	struct vop_reclaim_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+
+	vp->v_data = NULL;
+	return (0);
+}
+
+static int
+devfs_remove(ap)
+	struct vop_remove_args /* {
+		struct vnode *a_dvp;
+		struct vnode *a_vp;
+		struct componentname *a_cnp;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+
+	dd = ap->a_dvp->v_data;
+	de = vp->v_data;
+	devfs_delete(dd, de);
+	return (0);
+}
+
+/*
+ * Revoke is called on a tty when a terminal session ends.  The vnode
+ * is orphaned by setting v_op to deadfs so we need to let go of it
+ * as well so that we create a new one next time around.
+ */
+static int
+devfs_revoke(ap)
+	struct vop_revoke_args /* {
+		struct vnode *a_vp;
+		int a_flags;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct devfs_dirent *de;
+
+	de = vp->v_data;
+	vdrop(de->de_vnode);
+	de->de_vnode = NULL;
+	vop_revoke(ap);
+	return (0);
+}
+
+static int
+devfs_symlink(ap)
+	struct vop_symlink_args /* {
+		struct vnode *a_dvp;
+		struct vnode **a_vpp;
+		struct componentname *a_cnp;
+		struct vattr *a_vap;
+		char *a_target;
+	} */ *ap;
+{
+	int i;
+	struct devfs_dir *dd;
+	struct devfs_dirent *de;
+	struct devfs_mount *fmp;
+
+	fmp = (struct devfs_mount *)ap->a_dvp->v_mount->mnt_data;
+	dd = ap->a_dvp->v_data;
+	de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
+	de->de_uid = 0;
+	de->de_gid = 0;
+	de->de_mode = 0642;
+	de->de_inode = fmp->dm_inode++;
+	de->de_dirent->d_type = DT_LNK;
+	i = strlen(ap->a_target) + 1;
+	MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
+	bcopy(ap->a_target, de->de_symlink, i);
+	TAILQ_INSERT_TAIL(&dd->dd_list, de, de_list);
+	devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, 0);
+	VREF(*(ap->a_vpp));
+	return (0);
+}
+
+/*
+ * Print out the contents of a devfs vnode.
+ */
+/* ARGSUSED */
+static int
+devfs_print(ap)
+	struct vop_print_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	printf("tag VT_DEVFS, devfs vnode\n");
+	return (0);
+}
+
+/*
+ * Kernfs "should never get here" operation
+ */
+static int
+devfs_badop()
+{
+	return (EIO);
+}
+
+vop_t	**devfs_vnodeop_p;
+static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
+	{ &vop_default_desc,		(vop_t *) vop_defaultop },
+	{ &vop_access_desc,		(vop_t *) devfs_access },
+	{ &vop_bmap_desc,		(vop_t *) devfs_badop },
+	{ &vop_getattr_desc,		(vop_t *) devfs_getattr },
+	{ &vop_lookup_desc,		(vop_t *) devfs_lookup },
+	{ &vop_pathconf_desc,		(vop_t *) vop_stdpathconf },
+	{ &vop_print_desc,		(vop_t *) devfs_print },
+	{ &vop_readdir_desc,		(vop_t *) devfs_readdir },
+	{ &vop_readlink_desc,		(vop_t *) devfs_readlink },
+	{ &vop_reclaim_desc,		(vop_t *) devfs_reclaim },
+	{ &vop_remove_desc,		(vop_t *) devfs_remove },
+	{ &vop_revoke_desc,		(vop_t *) devfs_revoke },
+	{ &vop_setattr_desc,		(vop_t *) devfs_setattr },
+	{ &vop_symlink_desc,		(vop_t *) devfs_symlink },
+	{ NULL, NULL }
+};
+static struct vnodeopv_desc devfs_vnodeop_opv_desc =
+	{ &devfs_vnodeop_p, devfs_vnodeop_entries };
+
+VNODEOP_SET(devfs_vnodeop_opv_desc);
+
+#if 0
+int
+foo(ap)
+	struct vop_generic_args *ap;
+{
+	int i;
+
+	i = spec_vnoperate(ap);
+	printf("foo(%s) = %d\n", ap->a_desc->vdesc_name, i);
+	return (i);
+}
+#endif
+
+vop_t	**devfs_specop_p;
+static struct vnodeopv_entry_desc devfs_specop_entries[] = {
+#if 1
+	{ &vop_default_desc,		(vop_t *) spec_vnoperate },
+#else
+	{ &vop_default_desc,		(vop_t *) foo },
+	{ &vop_lock_desc,		(vop_t *) spec_vnoperate },
+	{ &vop_unlock_desc,		(vop_t *) spec_vnoperate },
+	{ &vop_lease_desc,		(vop_t *) spec_vnoperate },
+	{ &vop_strategy_desc,		(vop_t *) spec_vnoperate },
+	{ &vop_bmap_desc,		(vop_t *) spec_vnoperate },
+#endif
+	{ &vop_access_desc,		(vop_t *) devfs_access },
+	{ &vop_getattr_desc,		(vop_t *) devfs_getattr },
+	{ &vop_print_desc,		(vop_t *) devfs_print },
+	{ &vop_reclaim_desc,		(vop_t *) devfs_reclaim },
+	{ &vop_remove_desc,		(vop_t *) devfs_remove },
+	{ &vop_revoke_desc,		(vop_t *) devfs_revoke },
+	{ &vop_setattr_desc,		(vop_t *) devfs_setattr },
+	{ NULL, NULL }
+};
+static struct vnodeopv_desc devfs_specop_opv_desc =
+	{ &devfs_specop_p, devfs_specop_entries };
+
+VNODEOP_SET(devfs_specop_opv_desc);