e682a080e9
not set, unlock the vnode before calling the device's close routine and relock it after it returns. tty close routines will sleep waiting for buffers to drain, which won't happen often times as the other side needs to grab the vnode lock first. Make all unmount routines lock the device vnode before calling VOP_CLOSE().
700 lines
16 KiB
C
700 lines
16 KiB
C
/* $NetBSD: filecore_vfsops.c,v 1.8 1999/10/16 23:53:27 wrstuden Exp $ */
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/*-
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* Copyright (c) 1998 Andrew McMurry
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* Copyright (c) 1994 The Regents of the University of California.
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* 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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* filecore_vfsops.c 1.1 1998/6/26
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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/namei.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <miscfs/specfs/specdev.h>
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#include <sys/mount.h>
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#include <sys/buf.h>
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#include <sys/file.h>
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#include <sys/device.h>
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#include <sys/errno.h>
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#include <sys/malloc.h>
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#include <sys/pool.h>
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#include <filecorefs/filecore.h>
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#include <filecorefs/filecore_extern.h>
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#include <filecorefs/filecore_node.h>
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#include <filecorefs/filecore_mount.h>
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extern struct vnodeopv_desc filecore_vnodeop_opv_desc;
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struct vnodeopv_desc *filecore_vnodeopv_descs[] = {
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&filecore_vnodeop_opv_desc,
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NULL,
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};
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struct vfsops filecore_vfsops = {
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MOUNT_FILECORE,
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filecore_mount,
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filecore_start,
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filecore_unmount,
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filecore_root,
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filecore_quotactl,
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filecore_statfs,
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filecore_sync,
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filecore_vget,
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filecore_fhtovp,
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filecore_vptofh,
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filecore_init,
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filecore_sysctl,
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NULL, /* filecore_mountroot */
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filecore_checkexp,
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filecore_vnodeopv_descs,
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};
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/*
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* Called by vfs_mountroot when iso is going to be mounted as root.
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*
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* Name is updated by mount(8) after booting.
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*/
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static int filecore_mountfs __P((struct vnode *devvp, struct mount *mp,
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struct proc *p, struct filecore_args *argp));
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#if 0
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int
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filecore_mountroot()
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{
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struct mount *mp;
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extern struct vnode *rootvp;
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struct proc *p = curproc; /* XXX */
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int error;
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struct filecore_args args;
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if (root_device->dv_class != DV_DISK)
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return (ENODEV);
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/*
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* Get vnodes for swapdev and rootdev.
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*/
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if (bdevvp(rootdev, &rootvp))
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panic("filecore_mountroot: can't setup rootvp");
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if ((error = vfs_rootmountalloc(MOUNT_FILECORE, "root_device", &mp)) != 0)
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return (error);
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args.flags = FILECOREMNT_ROOT;
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if ((error = filecore_mountfs(rootvp, mp, p, &args)) != 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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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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(void)filecore_statfs(mp, &mp->mnt_stat, p);
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vfs_unbusy(mp);
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return (0);
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}
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#endif
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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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int
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filecore_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 filecore_args args;
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size_t size;
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int error;
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struct filecore_mnt *fcmp = NULL;
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error = copyin(data, (caddr_t)&args, sizeof (struct filecore_args));
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if (error)
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return (error);
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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return (EROFS);
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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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fcmp = VFSTOFILECORE(mp);
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if (args.fspec == 0)
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return (vfs_export(mp, &fcmp->fc_export, &args.export));
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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 ((error = namei(ndp)) != 0)
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return (error);
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devvp = ndp->ni_vp;
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if (devvp->v_type != VBLK) {
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vrele(devvp);
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return ENOTBLK;
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}
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if (major(devvp->v_rdev) >= nblkdev) {
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vrele(devvp);
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return ENXIO;
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}
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/*
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*/
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if (p->p_ucred->cr_uid != 0) {
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_ACCESS(devvp, VREAD, p->p_ucred, p);
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VOP_UNLOCK(devvp, 0);
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if (error) {
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vrele(devvp);
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return (error);
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}
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}
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if ((mp->mnt_flag & MNT_UPDATE) == 0)
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error = filecore_mountfs(devvp, mp, p, &args);
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else {
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if (devvp != fcmp->fc_devvp)
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error = EINVAL; /* needs translation */
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else
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vrele(devvp);
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}
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if (error) {
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vrele(devvp);
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return error;
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}
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fcmp = VFSTOFILECORE(mp);
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(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
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memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size);
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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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/*
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* Common code for mount and mountroot
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*/
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static int
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filecore_mountfs(devvp, mp, p, argp)
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struct vnode *devvp;
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struct mount *mp;
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struct proc *p;
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struct filecore_args *argp;
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{
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struct filecore_mnt *fcmp = (struct filecore_mnt *)0;
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struct buf *bp = NULL;
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dev_t dev = devvp->v_rdev;
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int error = EINVAL;
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int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
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extern struct vnode *rootvp;
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struct filecore_disc_record *fcdr;
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unsigned map;
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unsigned log2secsize;
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if (!ronly)
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return EROFS;
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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)) != 0)
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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)) != 0)
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return (error);
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error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
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if (error)
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return error;
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/* Read the filecore boot block to check FS validity and to find the map */
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error = bread(devvp, FILECORE_BOOTBLOCK_BLKN,
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FILECORE_BOOTBLOCK_SIZE, NOCRED, &bp);
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#ifdef FILECORE_DEBUG_BR
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printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp,
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FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE,
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bp, error);
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#endif
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if (error != 0)
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goto out;
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if (filecore_bbchecksum(bp->b_data) != 0) {
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error = EINVAL;
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goto out;
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}
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fcdr = (struct filecore_disc_record *)(bp->b_data+FILECORE_BB_DISCREC);
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map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare)
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* (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE)
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<< fcdr->log2bpmb) >> fcdr->log2secsize;
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log2secsize = fcdr->log2secsize;
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bp->b_flags |= B_AGE;
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) vf1\n", bp);
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#endif
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brelse(bp);
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bp = NULL;
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/* Read the bootblock in the map */
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error = bread(devvp, map, 1 << log2secsize, NOCRED, &bp);
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#ifdef FILECORE_DEBUG_BR
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printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp,
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map, 1 << log2secsize, bp, error);
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#endif
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if (error != 0)
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goto out;
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fcdr = (struct filecore_disc_record *)(bp->b_data + 4);
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fcmp = malloc(sizeof *fcmp, M_FILECOREMNT, M_WAITOK);
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memset((caddr_t)fcmp, 0, sizeof *fcmp);
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if (fcdr->log2bpmb > fcdr->log2secsize)
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fcmp->log2bsize = fcdr->log2bpmb;
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else fcmp->log2bsize = fcdr->log2secsize;
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fcmp->blksize = 1 << fcmp->log2bsize;
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memcpy((caddr_t)&fcmp->drec, (caddr_t)fcdr, sizeof(*fcdr));
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fcmp->map = map;
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fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare)
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/ (fcdr->idlen + 1);
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fcmp->mask = (1 << fcdr->idlen) - 1;
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if (fcdr->big_flag & 1) {
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fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32)
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+ fcdr->disc_size) / fcmp->blksize;
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} else {
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fcmp->nblks=fcdr->disc_size / fcmp->blksize;
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}
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bp->b_flags |= B_AGE;
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) vf2\n", bp);
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#endif
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brelse(bp);
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bp = NULL;
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mp->mnt_data = (qaddr_t)fcmp;
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mp->mnt_stat.f_fsid.val[0] = (long)dev;
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mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_FILECORE);
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mp->mnt_maxsymlinklen = 0;
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mp->mnt_flag |= MNT_LOCAL;
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fcmp->fc_mountp = mp;
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fcmp->fc_dev = dev;
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fcmp->fc_devvp = devvp;
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fcmp->fc_mntflags = argp->flags;
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if (argp->flags & FILECOREMNT_USEUID) {
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fcmp->fc_uid = p->p_cred->p_ruid;
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fcmp->fc_gid = p->p_cred->p_rgid;
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} else {
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fcmp->fc_uid = argp->uid;
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fcmp->fc_gid = argp->gid;
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}
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devvp->v_specflags |= SI_MOUNTEDON;
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return 0;
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out:
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if (bp) {
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#ifdef FILECORE_DEBUG_BR
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printf("brelse(%p) vf3\n", bp);
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#endif
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brelse(bp);
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}
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
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VOP_UNLOCK(devvp, 0);
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if (fcmp) {
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free((caddr_t)fcmp, M_FILECOREMNT);
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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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* Make a filesystem operational.
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* Nothing to do at the moment.
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*/
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/* ARGSUSED */
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int
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filecore_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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return 0;
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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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filecore_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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struct filecore_mnt *fcmp;
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int error, flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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#if 0
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mntflushbuf(mp, 0);
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if (mntinvalbuf(mp))
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return EBUSY;
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#endif
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if ((error = vflush(mp, NULLVP, flags)) != 0)
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return (error);
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fcmp = VFSTOFILECORE(mp);
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fcmp->fc_devvp->v_specflags &= ~SI_MOUNTEDON;
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vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED, p);
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vput(fcmp->fc_devvp);
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free((caddr_t)fcmp, M_FILECOREMNT);
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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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* Return root of a filesystem
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*/
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int
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filecore_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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struct vnode *nvp;
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int error;
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if ((error = VFS_VGET(mp, FILECORE_ROOTINO, &nvp)) != 0)
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return (error);
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*vpp = nvp;
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return (0);
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}
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/*
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* Do operations associated with quotas, not supported
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*/
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/* ARGSUSED */
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int
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filecore_quotactl(mp, cmd, uid, arg, p)
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struct mount *mp;
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int cmd;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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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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filecore_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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struct filecore_mnt *fcmp = VFSTOFILECORE(mp);
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#ifdef COMPAT_09
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sbp->f_type = 255;
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#else
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sbp->f_type = 0;
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#endif
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sbp->f_bsize = fcmp->blksize;
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sbp->f_iosize = sbp->f_bsize; /* XXX */
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sbp->f_blocks = fcmp->nblks;
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sbp->f_bfree = 0; /* total free blocks */
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sbp->f_bavail = 0; /* blocks free for non superuser */
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sbp->f_files = 0; /* total files */
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sbp->f_ffree = 0; /* free file nodes */
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if (sbp != &mp->mnt_stat) {
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memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN);
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memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN);
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}
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strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
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return 0;
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}
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/* ARGSUSED */
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int
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filecore_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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return (0);
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}
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|
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/*
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* File handle to vnode
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*
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|
* Have to be really careful about stale file handles:
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* - check that the inode number is in range
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* - call iget() to get the locked inode
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* - check for an unallocated inode (i_mode == 0)
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* - check that the generation number matches
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|
*/
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struct ifid {
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ushort ifid_len;
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ushort ifid_pad;
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|
u_int32_t ifid_ino;
|
|
};
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_fhtovp(mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct ifid *ifhp = (struct ifid *)fhp;
|
|
struct vnode *nvp;
|
|
struct filecore_node *ip;
|
|
int error;
|
|
|
|
if ((error = VFS_VGET(mp, ifhp->ifid_ino, &nvp)) != 0) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
ip = VTOI(nvp);
|
|
if (filecore_staleinode(ip)) {
|
|
vput(nvp);
|
|
*vpp = NULLVP;
|
|
return (ESTALE);
|
|
}
|
|
*vpp = nvp;
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_checkexp(mp, nam, exflagsp, credanonp)
|
|
struct mount *mp;
|
|
struct mbuf *nam;
|
|
int *exflagsp;
|
|
struct ucred **credanonp;
|
|
{
|
|
struct filecore_mnt *fcmp = VFSTOFILECORE(mp);
|
|
struct netcred *np;
|
|
|
|
/*
|
|
* Get the export permission structure for this <mp, client> tuple.
|
|
*/
|
|
np = vfs_export_lookup(mp, &fcmp->fc_export, nam);
|
|
if (np == NULL)
|
|
return (EACCES);
|
|
|
|
*exflagsp = np->netc_exflags;
|
|
*credanonp = &np->netc_anon;
|
|
return (0);
|
|
}
|
|
|
|
/* This looks complicated. Look at other vgets as well as the iso9660 one.
|
|
*
|
|
* The filecore inode number is made up of 1 byte directory entry index and
|
|
* 3 bytes of the internal disc address of the directory. On a read-only
|
|
* filesystem this is unique. For a read-write version we may not be able to
|
|
* do vget, see msdosfs.
|
|
*/
|
|
|
|
int
|
|
filecore_vget(mp, ino, vpp)
|
|
struct mount *mp;
|
|
ino_t ino;
|
|
struct vnode **vpp;
|
|
{
|
|
struct filecore_mnt *fcmp;
|
|
struct filecore_node *ip;
|
|
struct buf *bp;
|
|
struct vnode *vp;
|
|
dev_t dev;
|
|
int error;
|
|
|
|
fcmp = VFSTOFILECORE(mp);
|
|
dev = fcmp->fc_dev;
|
|
if ((*vpp = filecore_ihashget(dev, ino)) != NULLVP)
|
|
return (0);
|
|
|
|
/* Allocate a new vnode/filecore_node. */
|
|
if ((error = getnewvnode(VT_FILECORE, mp, filecore_vnodeop_p, &vp))
|
|
!= 0) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
ip = pool_get(&filecore_node_pool, PR_WAITOK);
|
|
memset((caddr_t)ip, 0, sizeof(struct filecore_node));
|
|
vp->v_data = ip;
|
|
ip->i_vnode = vp;
|
|
ip->i_dev = dev;
|
|
ip->i_number = ino;
|
|
ip->i_block = -1;
|
|
ip->i_parent = -2;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
filecore_ihashins(ip);
|
|
|
|
if (ino == FILECORE_ROOTINO) {
|
|
/* Here we need to construct a root directory inode */
|
|
memcpy((caddr_t)ip->i_dirent.name, (caddr_t)"root", 4);
|
|
ip->i_dirent.load = 0;
|
|
ip->i_dirent.exec = 0;
|
|
ip->i_dirent.len = FILECORE_DIR_SIZE;
|
|
ip->i_dirent.addr = fcmp->drec.root;
|
|
ip->i_dirent.attr = FILECORE_ATTR_DIR | FILECORE_ATTR_READ;
|
|
|
|
} else {
|
|
/* Read in Data from Directory Entry */
|
|
if ((error = filecore_bread(fcmp, ino & FILECORE_INO_MASK,
|
|
FILECORE_DIR_SIZE, NOCRED, &bp)) != 0) {
|
|
vput(vp);
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) vf4\n", bp);
|
|
#endif
|
|
brelse(bp);
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
|
|
memcpy((caddr_t)&ip->i_dirent,
|
|
(caddr_t)fcdirentry(bp->b_data, ino >> FILECORE_INO_INDEX),
|
|
sizeof(struct filecore_direntry));
|
|
#ifdef FILECORE_DEBUG_BR
|
|
printf("brelse(%p) vf5\n", bp);
|
|
#endif
|
|
brelse(bp);
|
|
}
|
|
|
|
ip->i_mnt = fcmp;
|
|
ip->i_devvp = fcmp->fc_devvp;
|
|
ip->i_diroff = 0;
|
|
VREF(ip->i_devvp);
|
|
|
|
/*
|
|
* Setup type
|
|
*/
|
|
vp->v_type = VREG;
|
|
if (ip->i_dirent.attr & FILECORE_ATTR_DIR)
|
|
vp->v_type = VDIR;
|
|
|
|
/*
|
|
* Initialize the associated vnode
|
|
*/
|
|
switch (vp->v_type) {
|
|
case VFIFO:
|
|
case VCHR:
|
|
case VBLK:
|
|
/*
|
|
* Devices not supported.
|
|
*/
|
|
vput(vp);
|
|
return (EOPNOTSUPP);
|
|
case VLNK:
|
|
case VNON:
|
|
case VSOCK:
|
|
case VDIR:
|
|
case VBAD:
|
|
case VREG:
|
|
break;
|
|
}
|
|
|
|
if (ino == FILECORE_ROOTINO)
|
|
vp->v_flag |= VROOT;
|
|
|
|
/*
|
|
* XXX need generation number?
|
|
*/
|
|
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
struct filecore_node *ip = VTOI(vp);
|
|
struct ifid *ifhp;
|
|
|
|
ifhp = (struct ifid *)fhp;
|
|
ifhp->ifid_len = sizeof(struct ifid);
|
|
ifhp->ifid_ino = ip->i_number;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
filecore_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
struct proc *p;
|
|
{
|
|
return (EOPNOTSUPP);
|
|
}
|