FreeBSD/Linux Kernel Cross Reference
sys/compat/irix/irix_mount.c

     /*      $NetBSD: irix_mount.c,v 1.22 2008/04/28 20:23:41 martin Exp $ */
     
     /*-
      * Copyright (c) 2001 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Emmanuel Dreyfus.
      *
     * 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.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: irix_mount.c,v 1.22 2008/04/28 20:23:41 martin Exp $");
    
    #include <sys/types.h>
    #include <sys/signal.h>
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/mount.h>
    #include <sys/namei.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/vnode_if.h>
    #include <sys/kauth.h>
    
    #include <compat/common/compat_util.h>
    
    #include <compat/irix/irix_types.h>
    #include <compat/irix/irix_signal.h>
    #include <compat/irix/irix_syscall.h>
    #include <compat/irix/irix_syscallargs.h>
    
    int
    irix_sys_getmountid(struct lwp *l, const struct irix_sys_getmountid_args *uap, register_t *retval)
    {
            /* {
                    syscallarg(const char *) path;
                    syscallarg(irix_mountid_t *) buf;
            } */
            kauth_cred_t cred;
            struct vnode *vp;
            int error = 0;
            struct nameidata nd;
            irix_mountid_t mountid;
            void *addr;
    
            cred = kauth_cred_dup(l->l_cred);
            kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred));
            kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred));
    
            /* Get the vnode for the requested path */
            NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE,
                SCARG(uap, path));
            nd.ni_cnd.cn_cred = cred;
            if ((error = namei(&nd)) != 0)
                    goto out;
            vp = nd.ni_vp;
    
            /* Check for accessibility */
            if ((error = VOP_ACCESS(vp, VREAD | VEXEC, cred)) != 0)
                    goto bad;
    
            /*
             * Return the address of the mount structure
             * as the unique ID for the filesystem
             */
            addr = (void *)&vp->v_mount;
            bzero((void *)&mountid, sizeof(mountid));
            (void)memcpy((void *)&mountid, &addr, sizeof(addr));
            error = copyout(&mountid, SCARG(uap, buf), sizeof(mountid));
    
    bad:
            vput(vp);
    out:
            kauth_cred_free(cred);
            return (error);
    }

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