+ int type;
+ char *dir;
+ int flags;
+ caddr_t data;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct nameidata *ndp = &scp->sc_nd;
+ struct vnode *vp;
+ struct mount *mp;
+ int error;
+
+ /*
+ * Must be super user
+ */
+ if (error = suser(scp->sc_cred, &scp->sc_acflag))
+ RETURN (error);
+ /*
+ * Get vnode to be covered
+ */
+ ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
+ ndp->ni_segflg = UIO_USERSPACE;
+ ndp->ni_dirp = uap->dir;
+ if (error = namei(ndp))
+ RETURN (error);
+ vp = ndp->ni_vp;
+ if (vp->v_count != 1) {
+ vput(vp);
+ RETURN (EBUSY);
+ }
+ if (vp->v_type != VDIR) {
+ vput(vp);
+ RETURN (ENOTDIR);
+ }
+ if (uap->type > MOUNT_MAXTYPE ||
+ vfssw[uap->type] == (struct vfsops *)0) {
+ vput(vp);
+ RETURN (ENODEV);
+ }
+
+ /*
+ * Mount the filesystem.
+ */
+ mp = (struct mount *)malloc((u_long)sizeof(struct mount),
+ M_MOUNT, M_WAITOK);
+ mp->m_op = vfssw[uap->type];
+ mp->m_flag = 0;
+ mp->m_exroot = 0;
+ error = vfs_add(vp, mp, uap->flags);
+ if (!error)
+ error = VFS_MOUNT(mp, uap->dir, uap->data, ndp);
+ cache_purge(vp);
+ VOP_UNLOCK(vp);
+ if (!error) {
+ vfs_unlock(mp);
+ } else {
+ vfs_remove(mp);
+ free((caddr_t)mp, M_MOUNT);
+ vrele(vp);
+ }
+ RETURN (error);
+}
+
+/*
+ * Unmount system call.
+ *
+ * Note: unmount takes a path to the vnode mounted on as argument,
+ * not special file (as before).
+ */
+unmount(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ char *pathp;
+ int flags;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct vnode *vp;
+ register struct mount *mp;
+ register struct nameidata *ndp = &scp->sc_nd;
+ struct vnode *coveredvp;
+ int error;
+
+ /*
+ * Must be super user
+ */
+ if (error = suser(scp->sc_cred, &scp->sc_acflag))
+ RETURN (error);
+
+ ndp->ni_nameiop = LOOKUP | LOCKLEAF | FOLLOW;
+ ndp->ni_segflg = UIO_USERSPACE;
+ ndp->ni_dirp = uap->pathp;
+ if (error = namei(ndp))
+ RETURN (error);
+ vp = ndp->ni_vp;
+ /*
+ * Must be the root of the filesystem
+ */
+ if ((vp->v_flag & VROOT) == 0) {
+ vput(vp);
+ RETURN (EINVAL);
+ }
+ mp = vp->v_mount;
+ vput(vp);
+ /*
+ * Do the unmount.
+ */
+ coveredvp = mp->m_vnodecovered;
+ if (error = vfs_lock(mp))
+ RETURN (error);
+
+ xumount(mp); /* remove unused sticky files from text table */
+ cache_purgevfs(mp); /* remove cache entries for this file sys */
+ VFS_SYNC(mp, MNT_WAIT);
+
+ error = VFS_UNMOUNT(mp, uap->flags);
+ if (error) {
+ vfs_unlock(mp);
+ } else {
+ vrele(coveredvp);
+ vfs_remove(mp);
+ free((caddr_t)mp, M_MOUNT);
+ }
+ RETURN (error);
+}
+
+/*
+ * Sync system call.
+ * Sync each mounted filesystem.
+ */
+sync(scp)
+ register struct syscontext *scp;
+{
+ register struct mount *mp;
+
+ mp = rootfs;
+ do {
+ if ((mp->m_flag & M_RDONLY) == 0)
+ VFS_SYNC(mp, MNT_NOWAIT);
+ mp = mp->m_next;
+ } while (mp != rootfs);
+}
+
+/*
+ * get filesystem statistics
+ */
+statfs(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ char *path;
+ struct statfs *buf;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct vnode *vp;
+ register struct nameidata *ndp = &scp->sc_nd;
+ struct statfs sb;
+ int error;
+
+ ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
+ ndp->ni_segflg = UIO_USERSPACE;
+ ndp->ni_dirp = uap->path;
+ if (error = namei(ndp))
+ RETURN (error);
+ vp = ndp->ni_vp;
+ if (error = VFS_STATFS(vp->v_mount, &sb))
+ goto out;
+ error = copyout((caddr_t)&sb, (caddr_t)uap->buf, sizeof(sb));
+out:
+ vput(vp);
+ RETURN (error);
+}
+
+fstatfs(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ int fd;
+ struct statfs *buf;
+ } *uap = (struct a *)scp->sc_ap;
+ struct file *fp;
+ struct statfs sb;
+ int error;
+
+ if (error = getvnode(scp->sc_ofile, uap->fd, &fp))
+ RETURN (error);
+ if (error = VFS_STATFS(((struct vnode *)fp->f_data)->v_mount, &sb))
+ RETURN (error);
+ RETURN (copyout((caddr_t)&sb, (caddr_t)uap->buf, sizeof(sb)));
+}
+
+/*
+ * get statistics on all filesystems
+ */
+getfsstat(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ struct statfs *buf;
+ long bufsize;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct mount *mp;
+ register struct statfs *sfsp;
+ long count, maxcount, error;
+
+ maxcount = uap->bufsize / sizeof(struct statfs);
+ sfsp = uap->buf;
+ mp = rootfs;
+ count = 0;
+ do {
+ count++;
+ if (sfsp && count <= maxcount) {
+ if (error = VFS_STATFS(mp, sfsp))
+ RETURN (error);
+ sfsp++;
+ }
+ mp = mp->m_prev;
+ } while (mp != rootfs);
+ if (sfsp && count > maxcount)
+ scp->sc_retval1 = maxcount;
+ else
+ scp->sc_retval1 = count;
+ RETURN (0);
+}
+
+/*
+ * Change current working directory to a given file descriptor.
+ */
+fchdir(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ int fd;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct vnode *vp;
+ struct file *fp;
+ int error;
+
+ if (error = getvnode(scp->sc_ofile, uap->fd, &fp))
+ RETURN (error);
+ vp = (struct vnode *)fp->f_data;
+ VOP_LOCK(vp);
+ if (vp->v_type != VDIR)
+ error = ENOTDIR;
+ else
+ error = VOP_ACCESS(vp, VEXEC, scp->sc_cred);
+ VOP_UNLOCK(vp);
+ vrele(scp->sc_cdir);
+ scp->sc_cdir = vp;
+ RETURN (error);
+}
+
+/*
+ * Change current working directory (``.'').
+ */
+chdir(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ char *fname;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct nameidata *ndp = &scp->sc_nd;
+ int error;
+
+ ndp->ni_nameiop = LOOKUP | FOLLOW | LOCKLEAF;
+ ndp->ni_segflg = UIO_USERSPACE;
+ ndp->ni_dirp = uap->fname;
+ if (error = chdirec(ndp))
+ RETURN (error);
+ vrele(scp->sc_cdir);
+ scp->sc_cdir = ndp->ni_vp;
+ RETURN (0);
+}
+
+/*
+ * Change notion of root (``/'') directory.
+ */
+chroot(scp)
+ register struct syscontext *scp;
+{
+ struct a {
+ char *fname;
+ } *uap = (struct a *)scp->sc_ap;
+ register struct nameidata *ndp = &scp->sc_nd;
+ int error;