The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_conf.c

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    1 /*
    2  * Copyright (c) 1989, 1993, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  * Copyright (c) 1995 Artisoft, Inc.  All Rights Reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)vfs_conf.c  8.8 (Berkeley) 3/31/94
   35  * $FreeBSD$
   36  */
   37 
   38 /*
   39  * PURPOSE:     This file abstracts the root mounting interface from
   40  *              the per file system semantics for handling mounts,
   41  *              the overall intent of which is to move the BSD
   42  *              internals dependence out of the FS code, both to
   43  *              make the FS code more portable and to free up some
   44  *              of the BSD internals so that they may more easily
   45  *              be changed.
   46  *
   47  * NOTE1:       Code is single entry/single exit to aid debugging
   48  *              and conversion for kernel multithreading.
   49  *
   50  * NOTE2:       Code notes lock state in headers on entry and exit
   51  *              as an aid to conversion for kernel multithreading
   52  *              on SMP reentrancy
   53  */
   54 #include "opt_bootp.h"
   55 
   56 #include <sys/param.h>          /* dev_t (types.h)*/
   57 #include <sys/kernel.h>
   58 #include <sys/systm.h>          /* rootvp*/
   59 #include <sys/proc.h>           /* curproc*/
   60 #include <sys/vnode.h>          /* NULLVP*/
   61 #include <sys/mount.h>          /* struct mount*/
   62 #include <sys/malloc.h>         /* M_MOUNT*/
   63 
   64 /*
   65  * GLOBALS
   66  */
   67 
   68 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
   69 
   70 /*
   71  *  These define the root filesystem, device, and root filesystem type.
   72  */
   73 dev_t rootdevs[] = { NODEV, NODEV };
   74 char *rootdevnames[2];
   75 struct vnode *rootvnode;
   76 char *mountrootfsname;
   77 #ifdef BOOTP
   78 extern void bootpc_init __P((void));
   79 #endif
   80 
   81 /*
   82  * vfs_init() will set maxvfsconf
   83  * to the highest defined type number.
   84  */
   85 int maxvfsconf;
   86 struct vfsconf *vfsconf;
   87 
   88 /*
   89  * Common root mount code shared by all filesystems
   90  */
   91 #define ROOTNAME        "root_device"
   92 
   93 /*
   94  * vfs_mountrootfs
   95  *
   96  * Common entry point for root mounts
   97  *
   98  * PARAMETERS:
   99  *              NONE
  100  *
  101  * RETURNS:     0       Success
  102  *              !0      error number (errno.h)
  103  *
  104  * LOCK STATE:
  105  *              ENTRY
  106  *                      <no locks held>
  107  *              EXIT
  108  *                      <no locks held>
  109  *
  110  * NOTES:
  111  *              This code is currently supported only for use for
  112  *              the FFS file system type.  This is a matter of
  113  *              fixing the other file systems, not this code!
  114  */
  115 static void
  116 vfs_mountrootfs(void *unused)
  117 {
  118         struct mount            *mp;
  119         int                     i, err;
  120         struct proc             *p = curproc;   /* XXX */
  121         dev_t                   orootdev;
  122 
  123 #ifdef BOOTP
  124         bootpc_init();
  125 #endif
  126         /*
  127          *  New root mount structure
  128          */
  129         if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
  130                 printf("error %d: ", err);
  131                 panic("cannot mount root\n");
  132                 return ;
  133         }
  134         mp->mnt_flag            |= MNT_ROOTFS;
  135 
  136         /*
  137          * Attempt the mount
  138          */
  139         err = ENXIO;
  140         orootdev = rootdev;
  141         if (rootdevs[0] == NODEV)
  142                 rootdevs[0] = rootdev;
  143         for (i = 0; i < sizeof(rootdevs) / sizeof(rootdevs[0]); i++) {
  144                 if (rootdevs[i] == NODEV)
  145                         break;
  146                 rootdev = rootdevs[i];
  147                 if (rootdev != orootdev) {
  148                         printf("changing root device to %s\n", rootdevnames[i]);
  149                         orootdev = rootdev;
  150                 }
  151                 strncpy(mp->mnt_stat.f_mntfromname,
  152                     rootdevnames[i] ? rootdevnames[i] : ROOTNAME, MNAMELEN - 1);
  153                 err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
  154                 if (err != ENXIO)
  155                         break;
  156         }
  157         if (err) {
  158                 /*
  159                  * XXX should ask the user for the name in some cases.
  160                  * Why do we call vfs_unbusy() here and not after ENXIO
  161                  * is returned above?
  162                  */
  163                 vfs_unbusy(mp, p);
  164                 /*
  165                  * free mount struct before failing
  166                  * (hardly worthwhile with the PANIC eh?)
  167                  */
  168                 free( mp, M_MOUNT);
  169                 printf("error %d: ", err);
  170                 panic("cannot mount root (2)\n");
  171                 return;
  172         }
  173 
  174         simple_lock(&mountlist_slock);
  175 
  176         /*
  177          * Add fs to list of mounted file systems
  178          */
  179         CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
  180 
  181         simple_unlock(&mountlist_slock);
  182         vfs_unbusy(mp, p);
  183 
  184         /* root mount, update system time from FS specific data*/
  185         inittodr(mp->mnt_time);
  186         return;
  187 }
  188 
  189 SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)
  190 

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