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1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
170 lines
4.9 KiB
C
170 lines
4.9 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1995 Artisoft, Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_conf.c 8.8 (Berkeley) 3/31/94
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* $FreeBSD$
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*/
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/*
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* PURPOSE: This file abstracts the root mounting interface from
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* the per file system semantics for handling mounts,
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* the overall intent of which is to move the BSD
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* internals dependence out of the FS code, both to
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* make the FS code more portable and to free up some
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* of the BSD internals so that they may more easily
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* be changed.
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*
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* NOTE1: Code is single entry/single exit to aid debugging
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* and conversion for kernel multithreading.
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*
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* NOTE2: Code notes lock state in headers on entry and exit
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* as an aid to conversion for kernel multithreading
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* on SMP reentrancy
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*/
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#include <sys/param.h> /* dev_t (types.h)*/
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#include <sys/systm.h> /* rootvp*/
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#include <sys/proc.h> /* curproc*/
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#include <sys/vnode.h> /* NULLVP*/
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#include <sys/mount.h> /* struct mount*/
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#include <sys/malloc.h> /* M_MOUNT*/
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/*
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* GLOBALS
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*/
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int (*mountroot) __P((void *));
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struct vnode *rootvnode;
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struct vfsops *mountrootvfsops;
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/*
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* Common root mount code shared by all filesystems
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*/
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#define ROOTDIR "/"
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#define ROOTNAME "root_device"
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/*
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* vfs_mountroot
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*
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* Common entry point for root mounts
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*
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* PARAMETERS:
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* data pointer to the vfs_ops for the FS type mounting
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*
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* RETURNS: 0 Success
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* !0 error number (errno.h)
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*
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* LOCK STATE:
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* ENTRY
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* <no locks held>
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* EXIT
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* <no locks held>
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*
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* NOTES:
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* This code is currently supported only for use for
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* the FFS file system type. This is a matter of
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* fixing the other file systems, not this code!
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*/
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int
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vfs_mountroot(data)
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void *data;
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{
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struct mount *mp;
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u_int size;
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int err = 0;
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struct proc *p = curproc; /* XXX */
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struct vfsops *mnt_op = (struct vfsops *)data;
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/*
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* New root mount structure
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*/
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mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK);
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bzero((char *)mp, (u_long)sizeof(struct mount));
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mp->mnt_op = mnt_op;
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mp->mnt_flag = MNT_ROOTFS;
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mp->mnt_vnodecovered = NULLVP;
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/*
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* Lock mount point
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*/
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if( ( err = vfs_lock(mp)) != 0)
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goto error_1;
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/* Save "last mounted on" info for mount point (NULL pad)*/
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copystr( ROOTDIR, /* mount point*/
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mp->mnt_stat.f_mntonname, /* save area*/
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MNAMELEN - 1, /* max size*/
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&size); /* real size*/
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bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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/* Save "mounted from" info for mount point (NULL pad)*/
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copystr( ROOTNAME, /* device name*/
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mp->mnt_stat.f_mntfromname, /* save area*/
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MNAMELEN - 1, /* max size*/
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&size); /* real size*/
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bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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/*
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* Attempt the mount
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*/
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err = VFS_MOUNT( mp, NULL, NULL, NULL, p);
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if( err)
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goto error_2;
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/* Add fs to list of mounted file systems*/
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CIRCLEQ_INSERT_TAIL( &mountlist, mp, mnt_list);
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/* Unlock mount point*/
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vfs_unlock(mp);
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/* root mount, update system time from FS specific data*/
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inittodr( mp->mnt_time);
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goto success;
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error_2: /* mount error*/
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/* unlock before failing*/
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vfs_unlock( mp);
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error_1: /* lock error*/
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/* free mount struct before failing*/
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free( mp, M_MOUNT);
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success:
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return( err);
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}
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