350 lines
8.7 KiB
C
350 lines
8.7 KiB
C
/* $NetBSD: mfs_vfsops.c,v 1.25 2000/03/30 12:41:14 augustss Exp $ */
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/*
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* Copyright (c) 1989, 1990, 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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* @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
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*/
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#if defined(_KERNEL) && !defined(_LKM)
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#include "opt_compat_netbsd.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/malloc.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/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <ufs/mfs/mfsnode.h>
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#include <ufs/mfs/mfs_extern.h>
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caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
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u_long mfs_rootsize; /* size of mini-root in bytes */
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static int mfs_minor; /* used for building internal dev_t */
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extern int (**mfs_vnodeop_p) __P((void *));
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/*
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* mfs vfs operations.
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*/
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extern struct vnodeopv_desc mfs_vnodeop_opv_desc;
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struct vnodeopv_desc *mfs_vnodeopv_descs[] = {
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&mfs_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops mfs_vfsops = {
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MOUNT_MFS,
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mfs_mount,
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mfs_start,
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ffs_unmount,
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ufs_root,
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ufs_quotactl,
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mfs_statfs,
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ffs_sync,
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ffs_vget,
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ffs_fhtovp,
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ffs_vptofh,
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mfs_init,
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mfs_done,
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ffs_sysctl,
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NULL,
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ufs_check_export,
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mfs_vnodeopv_descs,
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};
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/*
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* Memory based filesystem initialization.
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*/
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void
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mfs_init()
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{
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/*
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* ffs_init() ensures to initialize necessary resources
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* only once.
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*/
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ffs_init();
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}
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void
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mfs_done()
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{
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/*
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* ffs_done() ensures to free necessary resources
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* only once, when it's no more needed.
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*/
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ffs_done();
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}
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/*
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* Called by main() when mfs is going to be mounted as root.
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*/
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int
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mfs_mountroot()
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{
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struct fs *fs;
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struct mount *mp;
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struct proc *p = curproc; /* XXX */
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struct ufsmount *ump;
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struct mfsnode *mfsp;
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int error = 0;
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/*
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* Get vnodes for rootdev.
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*/
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if (bdevvp(rootdev, &rootvp)) {
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printf("mfs_mountroot: can't setup bdevvp's");
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return (error);
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}
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if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) {
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vrele(rootvp);
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return (error);
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}
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mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
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rootvp->v_data = mfsp;
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rootvp->v_op = mfs_vnodeop_p;
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rootvp->v_tag = VT_MFS;
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mfsp->mfs_baseoff = mfs_rootbase;
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mfsp->mfs_size = mfs_rootsize;
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mfsp->mfs_vnode = rootvp;
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mfsp->mfs_pid = p->p_pid;
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BUFQ_INIT(&mfsp->mfs_buflist);
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if ((error = ffs_mountfs(rootvp, mp, p)) != 0) {
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mp->mnt_op->vfs_refcount--;
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vfs_unbusy(mp);
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free(mp, M_MOUNT);
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free(mfsp, M_MFSNODE);
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vrele(rootvp);
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return (error);
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}
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simple_lock(&mountlist_slock);
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CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
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simple_unlock(&mountlist_slock);
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mp->mnt_vnodecovered = NULLVP;
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ump = VFSTOUFS(mp);
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fs = ump->um_fs;
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(void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0);
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(void)ffs_statfs(mp, &mp->mnt_stat, p);
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vfs_unbusy(mp);
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inittodr((time_t)0);
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return (0);
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}
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/*
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* This is called early in boot to set the base address and size
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* of the mini-root.
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*/
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int
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mfs_initminiroot(base)
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caddr_t base;
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{
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struct fs *fs = (struct fs *)(base + SBOFF);
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extern int (*mountroot) __P((void));
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/* check for valid super block */
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if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
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fs->fs_bsize < sizeof(struct fs))
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return (0);
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mountroot = mfs_mountroot;
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mfs_rootbase = base;
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mfs_rootsize = fs->fs_fsize * fs->fs_size;
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rootdev = makedev(255, mfs_minor++);
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return (mfs_rootsize);
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}
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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/* ARGSUSED */
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int
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mfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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const char *path;
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void *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 mfs_args args;
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struct ufsmount *ump;
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struct fs *fs;
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struct mfsnode *mfsp;
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size_t size;
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int flags, error;
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error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args));
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if (error)
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return (error);
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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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fs = ump->um_fs;
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if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
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flags = WRITECLOSE;
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if (mp->mnt_flag & MNT_FORCE)
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flags |= FORCECLOSE;
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error = ffs_flushfiles(mp, flags, p);
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if (error)
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return (error);
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}
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if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
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fs->fs_ronly = 0;
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if (args.fspec == 0)
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return (vfs_export(mp, &ump->um_export, &args.export));
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return (0);
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}
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error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
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if (error)
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return (error);
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devvp->v_type = VBLK;
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if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
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panic("mfs_mount: dup dev");
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mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
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devvp->v_data = mfsp;
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mfsp->mfs_baseoff = args.base;
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mfsp->mfs_size = args.size;
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mfsp->mfs_vnode = devvp;
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mfsp->mfs_pid = p->p_pid;
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BUFQ_INIT(&mfsp->mfs_buflist);
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if ((error = ffs_mountfs(devvp, mp, p)) != 0) {
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BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1;
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vrele(devvp);
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return (error);
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}
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ump = VFSTOUFS(mp);
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fs = ump->um_fs;
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(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
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memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size);
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memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, 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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memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size);
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return (0);
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}
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int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
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/*
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* Used to grab the process and keep it in the kernel to service
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* memory filesystem I/O requests.
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*
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* Loop servicing I/O requests.
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* Copy the requested data into or out of the memory filesystem
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* address space.
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*/
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/* ARGSUSED */
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int
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mfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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struct vnode *vp = VFSTOUFS(mp)->um_devvp;
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struct mfsnode *mfsp = VTOMFS(vp);
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struct buf *bp;
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caddr_t base;
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int sleepreturn = 0;
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base = mfsp->mfs_baseoff;
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while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) {
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/*
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* If a non-ignored signal is received, try to unmount.
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* If that fails, or the filesystem is already in the
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* process of being unmounted, clear the signal (it has been
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* "processed"), otherwise we will loop here, as tsleep
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* will always return EINTR/ERESTART.
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*/
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if (sleepreturn != 0) {
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if (vfs_busy(mp, LK_NOWAIT, 0) ||
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dounmount(mp, 0, p) != 0)
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CLRSIG(p, CURSIG(p));
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sleepreturn = 0;
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continue;
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}
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while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) {
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BUFQ_REMOVE(&mfsp->mfs_buflist, bp);
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mfs_doio(bp, base);
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wakeup((caddr_t)bp);
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}
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sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0);
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}
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return (sleepreturn);
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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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mfs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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int error;
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error = ffs_statfs(mp, sbp, p);
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#ifdef COMPAT_09
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sbp->f_type = 3;
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#else
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sbp->f_type = 0;
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#endif
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strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
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return (error);
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}
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