592 lines
16 KiB
C
592 lines
16 KiB
C
/* $NetBSD: filecore_vfsops.c,v 1.78 2015/03/28 19:24:05 maxv Exp $ */
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/*-
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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. 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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/*-
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* Copyright (c) 1998 Andrew McMurry
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: filecore_vfsops.c,v 1.78 2015/03/28 19:24:05 maxv Exp $");
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#if defined(_KERNEL_OPT)
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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/genfs/genfs.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/pool.h>
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#include <sys/conf.h>
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#include <sys/sysctl.h>
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#include <sys/kauth.h>
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#include <sys/module.h>
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#include <fs/filecorefs/filecore.h>
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#include <fs/filecorefs/filecore_extern.h>
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#include <fs/filecorefs/filecore_node.h>
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#include <fs/filecorefs/filecore_mount.h>
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MODULE(MODULE_CLASS_VFS, filecore, NULL);
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static struct sysctllog *filecore_sysctl_log;
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extern const struct vnodeopv_desc filecore_vnodeop_opv_desc;
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const struct vnodeopv_desc * const 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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.vfs_name = MOUNT_FILECORE,
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.vfs_min_mount_data = sizeof (struct filecore_args),
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.vfs_mount = filecore_mount,
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.vfs_start = filecore_start,
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.vfs_unmount = filecore_unmount,
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.vfs_root = filecore_root,
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.vfs_quotactl = (void *)eopnotsupp,
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.vfs_statvfs = filecore_statvfs,
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.vfs_sync = filecore_sync,
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.vfs_vget = filecore_vget,
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.vfs_loadvnode = filecore_loadvnode,
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.vfs_fhtovp = filecore_fhtovp,
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.vfs_vptofh = filecore_vptofh,
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.vfs_init = filecore_init,
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.vfs_reinit = filecore_reinit,
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.vfs_done = filecore_done,
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.vfs_snapshot = (void *)eopnotsupp,
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.vfs_extattrctl = vfs_stdextattrctl,
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.vfs_suspendctl = (void *)eopnotsupp,
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.vfs_renamelock_enter = genfs_renamelock_enter,
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.vfs_renamelock_exit = genfs_renamelock_exit,
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.vfs_fsync = (void *)eopnotsupp,
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.vfs_opv_descs = filecore_vnodeopv_descs
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};
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static int
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filecore_modcmd(modcmd_t cmd, void *arg)
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{
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int error;
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switch (cmd) {
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case MODULE_CMD_INIT:
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error = vfs_attach(&filecore_vfsops);
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if (error != 0)
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break;
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sysctl_createv(&filecore_sysctl_log, 0, NULL, NULL,
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CTLFLAG_PERMANENT,
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CTLTYPE_NODE, "filecore",
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SYSCTL_DESCR("Acorn FILECORE file system"),
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NULL, 0, NULL, 0,
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CTL_VFS, 19, CTL_EOL);
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/*
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* XXX the "19" above could be dynamic, thereby eliminating
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* one more instance of the "number to vfs" mapping problem,
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* but "19" is the order as taken from sys/mount.h
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*/
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break;
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case MODULE_CMD_FINI:
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error = vfs_detach(&filecore_vfsops);
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if (error != 0)
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break;
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sysctl_teardown(&filecore_sysctl_log);
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break;
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default:
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error = ENOTTY;
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break;
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}
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return (error);
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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(struct vnode *devvp, struct mount *mp,
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struct lwp *l, struct filecore_args *argp);
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#if 0
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int
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filecore_mountroot(void)
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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 (device_class(root_device) != 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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vfs_unbusy(mp, false, NULL);
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vfs_destroy(mp);
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return (error);
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}
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mountlist_append(mp);
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(void)filecore_statvfs(mp, &mp->mnt_stat, p);
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vfs_unbusy(mp, false, NULL);
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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(struct mount *mp, const char *path, void *data, size_t *data_len)
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{
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struct lwp *l = curlwp;
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struct vnode *devvp;
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struct filecore_args *args = data;
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int error;
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struct filecore_mnt *fcmp = NULL;
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if (args == NULL)
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return EINVAL;
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if (*data_len < sizeof *args)
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return EINVAL;
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if (mp->mnt_flag & MNT_GETARGS) {
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fcmp = VFSTOFILECORE(mp);
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if (fcmp == NULL)
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return EIO;
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args->flags = fcmp->fc_mntflags;
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args->uid = fcmp->fc_uid;
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args->gid = fcmp->fc_gid;
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args->fspec = NULL;
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*data_len = sizeof *args;
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return 0;
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}
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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return (EROFS);
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if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL)
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return EINVAL;
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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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error = namei_simple_user(args->fspec,
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NSM_FOLLOW_NOEMULROOT, &devvp);
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if (error != 0)
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return (error);
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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 (bdevsw_lookup(devvp->v_rdev) == NULL) {
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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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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
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KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD));
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VOP_UNLOCK(devvp);
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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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if ((mp->mnt_flag & MNT_UPDATE) == 0)
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error = filecore_mountfs(devvp, mp, l, args);
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else {
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fcmp = VFSTOFILECORE(mp);
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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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return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
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mp->mnt_op->vfs_name, mp, l);
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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(struct vnode *devvp, struct mount *mp, struct lwp *l, 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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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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if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0)
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return (error);
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
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error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED);
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VOP_UNLOCK(devvp);
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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, 0, &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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KASSERT(bp != NULL);
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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 *)((char *)(bp->b_data) +
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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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#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, BC_AGE);
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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, 0, &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 *)((char *)(bp->b_data) + 4);
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fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP);
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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(&fcmp->drec, 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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#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, BC_AGE);
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bp = NULL;
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mp->mnt_data = fcmp;
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mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
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mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE);
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mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
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mp->mnt_stat.f_namemax = 10;
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_dev_bshift = fcdr->log2secsize;
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mp->mnt_fs_bshift = fcmp->log2bsize;
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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 = kauth_cred_getuid(l->l_cred);
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fcmp->fc_gid = kauth_cred_getgid(l->l_cred);
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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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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, 0);
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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);
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VOP_UNLOCK(devvp);
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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(struct mount *mp, int flags)
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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(struct mount *mp, int mntflags)
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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 ((error = vflush(mp, NULLVP, flags)) != 0)
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return (error);
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fcmp = VFSTOFILECORE(mp);
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if (fcmp->fc_devvp->v_type != VBAD)
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spec_node_setmountedfs(fcmp->fc_devvp, NULL);
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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);
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vput(fcmp->fc_devvp);
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kmem_free(fcmp, sizeof(*fcmp));
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mp->mnt_data = NULL;
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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(struct mount *mp, 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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* Get file system statistics.
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*/
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int
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filecore_statvfs(struct mount *mp, struct statvfs *sbp)
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{
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|
struct filecore_mnt *fcmp = VFSTOFILECORE(mp);
|
|
|
|
sbp->f_bsize = fcmp->blksize;
|
|
sbp->f_frsize = sbp->f_bsize; /* XXX */
|
|
sbp->f_iosize = sbp->f_bsize; /* XXX */
|
|
sbp->f_blocks = fcmp->nblks;
|
|
sbp->f_bfree = 0; /* total free blocks */
|
|
sbp->f_bavail = 0; /* blocks free for non superuser */
|
|
sbp->f_bresvd = 0; /* reserved blocks */
|
|
sbp->f_files = 0; /* total files */
|
|
sbp->f_ffree = 0; /* free file nodes for non superuser */
|
|
sbp->f_favail = 0; /* free file nodes */
|
|
sbp->f_fresvd = 0; /* reserved file nodes */
|
|
copy_statvfs_info(sbp, mp);
|
|
return 0;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* File handle to vnode
|
|
*
|
|
* Have to be really careful about stale file handles:
|
|
* - check that the inode number is in range
|
|
* - call iget() to get the locked inode
|
|
* - check for an unallocated inode (i_mode == 0)
|
|
* - check that the generation number matches
|
|
*/
|
|
|
|
struct ifid {
|
|
ushort ifid_len;
|
|
ushort ifid_pad;
|
|
u_int32_t ifid_ino;
|
|
};
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
|
|
{
|
|
struct ifid ifh;
|
|
struct vnode *nvp;
|
|
struct filecore_node *ip;
|
|
int error;
|
|
|
|
if (fhp->fid_len != sizeof(struct ifid))
|
|
return EINVAL;
|
|
|
|
memcpy(&ifh, fhp, sizeof(ifh));
|
|
if ((error = VFS_VGET(mp, ifh.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);
|
|
}
|
|
|
|
/* 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(struct mount *mp, ino_t ino, struct vnode **vpp)
|
|
{
|
|
int error;
|
|
|
|
error = vcache_get(mp, &ino, sizeof(ino), vpp);
|
|
if (error)
|
|
return error;
|
|
error = vn_lock(*vpp, LK_EXCLUSIVE);
|
|
if (error) {
|
|
vrele(*vpp);
|
|
*vpp = NULL;
|
|
return error;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
|
|
{
|
|
struct filecore_node *ip = VTOI(vp);
|
|
struct ifid ifh;
|
|
|
|
if (*fh_size < sizeof(struct ifid)) {
|
|
*fh_size = sizeof(struct ifid);
|
|
return E2BIG;
|
|
}
|
|
memset(&ifh, 0, sizeof(ifh));
|
|
ifh.ifid_len = sizeof(struct ifid);
|
|
ifh.ifid_ino = ip->i_number;
|
|
memcpy(fhp, &ifh, sizeof(ifh));
|
|
return 0;
|
|
}
|