2b14f991e6
Submitted by: terry (terry lambert) This is a composite of 3 patch sets submitted by terry. they are: New low-level init code that supports loadbal modules better some cleanups in the namei code to help terry in 16-bit character support some changes to the mount-root code to make it a little more modular.. NOTE: mounting root off cdrom or NFS MIGHT be broken as I haven't been able to test those cases.. certainly mounting root of disk still works just fine.. mfs should work but is untested. (tomorrows task) The low level init stuff includes a total rewrite of init_main.c to make it possible for new modules to have an init phase by simply adding an entry to a TEXT_SET (or is it DATA_SET) list. thus a new module can be added to the kernel without editing any other files other than the 'files' file.
645 lines
16 KiB
C
645 lines
16 KiB
C
/*
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. 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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* @(#)lfs_vfsops.c 8.7 (Berkeley) 4/16/94
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* $Id: lfs_vfsops.c,v 1.11 1995/03/19 14:29:20 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/buf.h>
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#include <sys/mbuf.h>
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#include <sys/file.h>
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#include <sys/disklabel.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <miscfs/specfs/specdev.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
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struct vfsops lfs_vfsops = {
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lfs_mount,
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ufs_start,
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lfs_unmount,
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ufs_root,
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ufs_quotactl,
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lfs_statfs,
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lfs_sync,
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lfs_vget,
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lfs_fhtovp,
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lfs_vptofh,
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lfs_init,
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};
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VFS_SET(lfs_vfsops, lfs, MOUNT_LFS, 0);
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/*
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* lfs_mount
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*
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* Called when mounting local physical media
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*
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* PARAMETERS:
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* mountroot
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* mp mount point structure
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* path NULL (flag for root mount!!!)
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* data <unused>
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* ndp <unused>
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* p process (user credentials check [statfs])
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*
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* mount
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* mp mount point structure
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* path path to mount point
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* data pointer to argument struct in user space
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* ndp mount point namei() return (used for
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* credentials on reload), reused to look
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* up block device.
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* p process (user credentials check)
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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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*
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* ENTRY
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* mount point is locked
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* EXIT
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* mount point is locked
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*
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* NOTES:
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* A NULL path can be used for a flag since the mount
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* system call will fail with EFAULT in copyinstr in
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* namei() if it is a genuine NULL from the user.
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*
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* Root mounts are not currently supported.
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*/
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int
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lfs_mount(mp, path, data, ndp, p)
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register struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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struct vnode *devvp;
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struct ufs_args args;
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struct ufsmount *ump = 0;
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register struct lfs *fs; /* LFS */
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u_int size;
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int err;
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/*
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* Use NULL path to flag a root mount
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*/
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if( path == NULL) {
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/*
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***
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* Mounting root file system
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***
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*/
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/* XXX -- implement*/
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panic("lfs_mountroot: can't setup bdevvp for root");
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}
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/*
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***
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* Mounting non-root file system or updating a file system
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***
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*/
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/* copy in user arguments*/
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if (err = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
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goto error_1;
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/* Until LFS can do NFS right. XXX */
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if (args.export.ex_flags & MNT_EXPORTED) {
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err = EINVAL;
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goto error_1;
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}
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/*
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* If updating, check whether changing from read-only to
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* read/write; if there is no device name, that's all we do.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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ump = VFSTOUFS(mp);
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#ifdef NOTLFS /* LFS */
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fs = ump->um_fs;
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if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
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fs->fs_ronly = 0;
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#else
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fs = ump->um_lfs;
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if (fs->lfs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
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fs->lfs_ronly = 0;
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#endif
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if (args.fspec == 0) {
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/*
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* Process export requests. Jumping to "success"
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* will return the vfs_export() error code.
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*/
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err = vfs_export(mp, &ump->um_export, &args.export);
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goto success;
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}
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}
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/*
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* Not an update, or updating the name: look up the name
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* and verify that it refers to a sensible block device.
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*/
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NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
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if (err = namei(ndp))
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goto error_1;
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devvp = ndp->ni_vp;
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if (devvp->v_type != VBLK) {
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err = ENOTBLK;
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goto error_2;
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}
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if (major(devvp->v_rdev) >= nblkdev) {
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err = ENXIO;
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goto error_2;
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}
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if ((mp->mnt_flag & MNT_UPDATE) == 0)
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err = lfs_mountfs(devvp, mp, p); /* LFS */
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else {
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if (devvp != ump->um_devvp)
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err = EINVAL; /* needs translation */
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else
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vrele(devvp);
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}
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if (err) {
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goto error_2;
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}
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ump = VFSTOUFS(mp);
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fs = ump->um_lfs; /* LFS */
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#ifdef NOTLFS /* LFS */
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(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
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bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
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bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
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MNAMELEN);
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(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void) ufs_statfs(mp, &mp->mnt_stat, p);
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#else
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(void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size);
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bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size);
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bcopy((caddr_t)fs->lfs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
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MNAMELEN);
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(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
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&size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void) lfs_statfs(mp, &mp->mnt_stat, p);
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#endif
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error_2: /* error with devvp held*/
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/* release devvp before failing*/
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vrele(devvp);
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error_1: /* no state to back out*/
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success:
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return( err);
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}
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/*
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* Common code for mount and mountroot
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* LFS specific
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*/
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int
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lfs_mountfs(devvp, mp, p)
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register struct vnode *devvp;
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struct mount *mp;
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struct proc *p;
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{
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register struct lfs *fs;
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register struct ufsmount *ump;
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struct vnode *vp;
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struct buf *bp;
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struct partinfo dpart;
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dev_t dev;
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int error, i, ronly, size;
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/*
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* Disallow multiple mounts of the same device.
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* Disallow mounting of a device that is currently in use
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* (except for root, which might share swap device for miniroot).
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* Flush out any old buffers remaining from a previous use.
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*/
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if (error = vfs_mountedon(devvp))
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return (error);
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if (vcount(devvp) > 1 && devvp != rootvp)
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return (EBUSY);
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if (error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0))
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return (error);
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ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
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if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
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return (error);
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if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
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size = DEV_BSIZE;
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else {
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size = dpart.disklab->d_secsize;
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#ifdef NEVER_USED
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dpart.part->p_fstype = FS_LFS;
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dpart.part->p_fsize = fs->lfs_fsize; /* frag size */
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dpart.part->p_frag = fs->lfs_frag; /* frags per block */
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dpart.part->p_cpg = fs->lfs_segshift; /* segment shift */
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#endif
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}
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/* Don't free random space on error. */
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bp = NULL;
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ump = NULL;
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/* Read in the superblock. */
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if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, NOCRED, &bp))
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goto out;
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fs = (struct lfs *)bp->b_data;
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/* Check the basics. */
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if (fs->lfs_magic != LFS_MAGIC || fs->lfs_bsize > MAXBSIZE ||
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fs->lfs_bsize < sizeof(struct lfs)) {
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error = EINVAL; /* XXX needs translation */
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goto out;
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}
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/* Allocate the mount structure, copy the superblock into it. */
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ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
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fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
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bcopy(bp->b_data, fs, sizeof(struct lfs));
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if (sizeof(struct lfs) < LFS_SBPAD) /* XXX why? */
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bp->b_flags |= B_INVAL;
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brelse(bp);
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bp = NULL;
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/* Set up the I/O information */
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fs->lfs_iocount = 0;
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/* Set up the ifile and lock aflags */
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fs->lfs_doifile = 0;
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fs->lfs_writer = 0;
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fs->lfs_dirops = 0;
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fs->lfs_seglock = 0;
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/* Set the file system readonly/modify bits. */
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fs->lfs_ronly = ronly;
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if (ronly == 0)
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fs->lfs_fmod = 1;
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/* Initialize the mount structure. */
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dev = devvp->v_rdev;
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mp->mnt_data = (qaddr_t)ump;
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mp->mnt_stat.f_fsid.val[0] = (long)dev;
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mp->mnt_stat.f_fsid.val[1] = MOUNT_LFS;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_maxsymlinklen = fs->lfs_maxsymlinklen;
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ump->um_mountp = mp;
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ump->um_dev = dev;
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ump->um_devvp = devvp;
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ump->um_bptrtodb = 0;
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ump->um_seqinc = 1 << fs->lfs_fsbtodb;
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ump->um_nindir = fs->lfs_nindir;
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for (i = 0; i < MAXQUOTAS; i++)
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ump->um_quotas[i] = NULLVP;
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devvp->v_specflags |= SI_MOUNTEDON;
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/*
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* We use the ifile vnode for almost every operation. Instead of
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* retrieving it from the hash table each time we retrieve it here,
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* artificially increment the reference count and keep a pointer
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* to it in the incore copy of the superblock.
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*/
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if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp))
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goto out;
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fs->lfs_ivnode = vp;
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VREF(vp);
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vput(vp);
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return (0);
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out:
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if (bp)
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brelse(bp);
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(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
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if (ump) {
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free(ump->um_lfs, M_UFSMNT);
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free(ump, M_UFSMNT);
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mp->mnt_data = (qaddr_t)0;
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}
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return (error);
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}
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/*
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* unmount system call
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*/
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int
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lfs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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register struct ufsmount *ump;
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register struct lfs *fs;
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int i, error, flags, ronly;
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flags = 0;
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if (mntflags & MNT_FORCE) {
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if (!doforce)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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ump = VFSTOUFS(mp);
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fs = ump->um_lfs;
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#ifdef QUOTA
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if (mp->mnt_flag & MNT_QUOTA) {
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if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags))
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return (error);
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for (i = 0; i < MAXQUOTAS; i++) {
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if (ump->um_quotas[i] == NULLVP)
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continue;
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quotaoff(p, mp, i);
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}
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/*
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* Here we fall through to vflush again to ensure
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* that we have gotten rid of all the system vnodes.
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*/
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}
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#endif
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if (error = vflush(mp, fs->lfs_ivnode, flags))
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return (error);
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fs->lfs_clean = 1;
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if (error = VFS_SYNC(mp, 1, p->p_ucred, p))
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return (error);
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if (fs->lfs_ivnode->v_dirtyblkhd.lh_first)
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panic("lfs_unmount: still dirty blocks on ifile vnode");
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vrele(fs->lfs_ivnode);
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vgone(fs->lfs_ivnode);
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ronly = fs->lfs_ronly;
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ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
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error = VOP_CLOSE(ump->um_devvp,
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ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
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vrele(ump->um_devvp);
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free(fs, M_UFSMNT);
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free(ump, M_UFSMNT);
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mp->mnt_data = (qaddr_t)0;
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mp->mnt_flag &= ~MNT_LOCAL;
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return (error);
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}
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/*
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* Get file system statistics.
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*/
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int
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lfs_statfs(mp, sbp, p)
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struct mount *mp;
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register struct statfs *sbp;
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struct proc *p;
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{
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register struct lfs *fs;
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register struct ufsmount *ump;
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ump = VFSTOUFS(mp);
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fs = ump->um_lfs;
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if (fs->lfs_magic != LFS_MAGIC)
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panic("lfs_statfs: magic");
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sbp->f_type = MOUNT_LFS;
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sbp->f_bsize = fs->lfs_bsize;
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sbp->f_iosize = fs->lfs_bsize;
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sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize);
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sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree);
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sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) -
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(fs->lfs_dsize - fs->lfs_bfree);
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sbp->f_bavail = dbtofsb(fs, sbp->f_bavail);
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sbp->f_files = fs->lfs_nfiles;
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sbp->f_ffree = sbp->f_bfree * INOPB(fs);
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if (sbp != &mp->mnt_stat) {
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bcopy((caddr_t)mp->mnt_stat.f_mntonname,
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(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
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bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
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(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
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}
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return (0);
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}
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/*
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|
* Go through the disk queues to initiate sandbagged IO;
|
|
* go through the inodes to write those that have been modified;
|
|
* initiate the writing of the super block if it has been modified.
|
|
*
|
|
* Note: we are always called with the filesystem marked `MPBUSY'.
|
|
*/
|
|
int
|
|
lfs_sync(mp, waitfor, cred, p)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct ucred *cred;
|
|
struct proc *p;
|
|
{
|
|
int error;
|
|
|
|
/* All syncs must be checkpoints until roll-forward is implemented. */
|
|
error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
|
|
#ifdef QUOTA
|
|
qsync(mp);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Look up an LFS dinode number to find its incore vnode. If not already
|
|
* in core, read it in from the specified device. Return the inode locked.
|
|
* Detection and handling of mount points must be done by the calling routine.
|
|
*/
|
|
int
|
|
lfs_vget(mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
register struct lfs *fs;
|
|
register struct inode *ip;
|
|
struct buf *bp;
|
|
struct ifile *ifp;
|
|
struct vnode *vp;
|
|
struct ufsmount *ump;
|
|
daddr_t daddr;
|
|
dev_t dev;
|
|
int error;
|
|
|
|
ump = VFSTOUFS(mp);
|
|
dev = ump->um_dev;
|
|
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
|
|
return (0);
|
|
|
|
/* Translate the inode number to a disk address. */
|
|
fs = ump->um_lfs;
|
|
if (ino == LFS_IFILE_INUM)
|
|
daddr = fs->lfs_idaddr;
|
|
else {
|
|
LFS_IENTRY(ifp, fs, ino, bp);
|
|
daddr = ifp->if_daddr;
|
|
brelse(bp);
|
|
if (daddr == LFS_UNUSED_DADDR)
|
|
return (ENOENT);
|
|
}
|
|
|
|
/* Allocate new vnode/inode. */
|
|
if (error = lfs_vcreate(mp, ino, &vp)) {
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Put it onto its hash chain and lock it so that other requests for
|
|
* this inode will block if they arrive while we are sleeping waiting
|
|
* for old data structures to be purged or for the contents of the
|
|
* disk portion of this inode to be read.
|
|
*/
|
|
ip = VTOI(vp);
|
|
ufs_ihashins(ip);
|
|
|
|
/*
|
|
* XXX
|
|
* This may not need to be here, logically it should go down with
|
|
* the i_devvp initialization.
|
|
* Ask Kirk.
|
|
*/
|
|
ip->i_lfs = ump->um_lfs;
|
|
|
|
/* Read in the disk contents for the inode, copy into the inode. */
|
|
if (error =
|
|
bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) {
|
|
/*
|
|
* The inode does not contain anything useful, so it would
|
|
* be misleading to leave it on its hash chain. With mode
|
|
* still zero, it will be unlinked and returned to the free
|
|
* list by vput().
|
|
*/
|
|
vput(vp);
|
|
brelse(bp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
|
|
brelse(bp);
|
|
|
|
/*
|
|
* Initialize the vnode from the inode, check for aliases. In all
|
|
* cases re-init ip, the underlying vnode/inode may have changed.
|
|
*/
|
|
if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
|
|
vput(vp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
/*
|
|
* Finish inode initialization now that aliasing has been resolved.
|
|
*/
|
|
ip->i_devvp = ump->um_devvp;
|
|
VREF(ip->i_devvp);
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File handle to vnode
|
|
*
|
|
* Have to be really careful about stale file handles:
|
|
* - check that the inode number is valid
|
|
* - call lfs_vget() to get the locked inode
|
|
* - check for an unallocated inode (i_mode == 0)
|
|
* - check that the given client host has export rights and return
|
|
* those rights via. exflagsp and credanonp
|
|
*
|
|
* XXX
|
|
* use ifile to see if inode is allocated instead of reading off disk
|
|
* what is the relationship between my generational number and the NFS
|
|
* generational number.
|
|
*/
|
|
int
|
|
lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
|
|
register struct mount *mp;
|
|
struct fid *fhp;
|
|
struct mbuf *nam;
|
|
struct vnode **vpp;
|
|
int *exflagsp;
|
|
struct ucred **credanonp;
|
|
{
|
|
register struct ufid *ufhp;
|
|
|
|
ufhp = (struct ufid *)fhp;
|
|
if (ufhp->ufid_ino < ROOTINO)
|
|
return (ESTALE);
|
|
return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
lfs_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
register struct inode *ip;
|
|
register struct ufid *ufhp;
|
|
|
|
ip = VTOI(vp);
|
|
ufhp = (struct ufid *)fhp;
|
|
ufhp->ufid_len = sizeof(struct ufid);
|
|
ufhp->ufid_ino = ip->i_number;
|
|
ufhp->ufid_gen = ip->i_gen;
|
|
return (0);
|
|
}
|