mirror of https://github.com/dzavalishin/oskit/
442 lines
11 KiB
C
Executable File
442 lines
11 KiB
C
Executable File
/*
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* Copyright (c) 1997-1998 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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#include <oskit/io/blkio.h>
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#include "fs_glue.h"
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#undef TRUE
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#undef FALSE
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#include <vm/vm.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.h>
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/*
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* oskit_filesystem internal constructor
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*/
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static struct oskit_filesystem_ops fs_ops;
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struct gfilesystem *gfilesystem_create(struct mount *mp)
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{
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struct gfilesystem *fs;
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MALLOC(fs,struct gfilesystem*,sizeof(struct gfilesystem),M_TEMP,M_WAITOK);
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if (!fs)
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return NULL;
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fs->fsi.ops = &fs_ops;
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fs->count = 1;
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fs->mp = mp;
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return fs;
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}
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/*
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* oskit_filesystem methods
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*/
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static OSKIT_COMDECL filesystem_query(oskit_filesystem_t *f,
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const struct oskit_guid *iid,
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void **out_ihandle)
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{
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struct gfilesystem *fs;
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fs = (struct gfilesystem*)f;
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if (fs == NULL)
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panic("%s:%d: null filesystem", __FILE__, __LINE__);
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if (fs->count == 0)
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panic("%s:%d: bad count", __FILE__, __LINE__);
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if (memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0 ||
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memcmp(iid, &oskit_filesystem_iid, sizeof(*iid)) == 0) {
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*out_ihandle = &fs->fsi;
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++fs->count;
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return 0;
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}
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*out_ihandle = NULL;
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return OSKIT_E_NOINTERFACE;
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}
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static OSKIT_COMDECL_U filesystem_addref(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs;
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fs = (struct gfilesystem*)f;
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if (fs == NULL)
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panic("%s:%d: null filesystem", __FILE__, __LINE__);
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if (fs->count == 0)
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panic("%s:%d: bad count", __FILE__, __LINE__);
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return ++fs->count;
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}
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static OSKIT_COMDECL_U filesystem_release(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs;
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struct proc *p;
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dev_t dev;
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int rc;
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unsigned newcount;
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fs = (struct gfilesystem*)f;
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if (fs == NULL)
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panic("%s:%d: null filesystem", __FILE__, __LINE__);
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if (fs->count == 0)
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panic("%s:%d: bad count", __FILE__, __LINE__);
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newcount = --fs->count;
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if (newcount == 0)
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{
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rc = getproc(&p);
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assert(rc == 0);
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if (fs->mp)
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{
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dev = ((struct ufsmount *)fs->mp->mnt_data)->um_dev;
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rc = dounmount(fs->mp, MNT_FORCE, p);
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assert(rc == 0);
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oskit_blkio_release((oskit_blkio_t *)dev);
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}
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prfree(p);
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free(fs,M_TEMP);
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}
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return newcount;
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}
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static OSKIT_COMDECL filesystem_statfs(oskit_filesystem_t *f,
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oskit_statfs_t *out_stats)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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struct statfs *sp;
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struct mount *mp;
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struct proc *p;
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oskit_error_t ferror;
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int error;
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if (!fs || !fs->count || !fs->mp)
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return OSKIT_E_INVALIDARG;
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ferror = getproc(&p);
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if (ferror)
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return ferror;
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mp = fs->mp;
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sp = &mp->mnt_stat;
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error = VFS_STATFS(fs->mp, sp, p);
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prfree(p);
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if (error)
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return errno_to_oskit_error(error);
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sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
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out_stats->flag = 0;
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if (sp->f_flags & MNT_RDONLY)
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out_stats->flag |= OSKIT_FS_RDONLY;
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if (sp->f_flags & MNT_NOEXEC)
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out_stats->flag |= OSKIT_FS_NOEXEC;
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if (sp->f_flags & MNT_NOSUID)
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out_stats->flag |= OSKIT_FS_NOSUID;
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if (sp->f_flags & MNT_NODEV)
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out_stats->flag |= OSKIT_FS_NODEV;
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out_stats->bsize = sp->f_bsize;
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out_stats->frsize = sp->f_bsize;
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out_stats->blocks = sp->f_blocks;
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out_stats->bfree = sp->f_bfree;
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out_stats->bavail = sp->f_bavail;
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out_stats->files = sp->f_files;
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out_stats->ffree = sp->f_ffree;
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out_stats->favail = sp->f_ffree;
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out_stats->fsid = sp->f_fsid.val[0]; /* device number */
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out_stats->namemax = NAME_MAX;
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return 0;
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}
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static OSKIT_COMDECL filesystem_sync(oskit_filesystem_t *f,
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oskit_bool_t wait)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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struct mount *mp;
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struct proc *p;
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oskit_error_t ferror;
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int error, asyncflag;
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if (!fs || !fs->count || !fs->mp)
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return OSKIT_E_INVALIDARG;
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ferror = getproc(&p);
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if (ferror)
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return ferror;
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mp = fs->mp;
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error = 0;
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if ((mp->mnt_flag & (MNT_MLOCK|MNT_RDONLY|MNT_MPBUSY)) == 0 &&
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!vfs_busy(mp)) {
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asyncflag = mp->mnt_flag & MNT_ASYNC;
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mp->mnt_flag &= ~MNT_ASYNC;
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error = VFS_SYNC(mp, wait ? MNT_WAIT : MNT_NOWAIT, p->p_ucred, p);
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if (asyncflag)
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mp->mnt_flag |= MNT_ASYNC;
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vfs_unbusy(mp);
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}
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prfree(p);
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if (error)
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return errno_to_oskit_error(error);
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return 0;
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}
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static OSKIT_COMDECL filesystem_getroot(oskit_filesystem_t *f,
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struct oskit_dir **out_dir)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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oskit_dir_t *d;
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struct proc *p;
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oskit_error_t ferror;
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struct vnode *vp;
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int error;
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if (!fs || !fs->count || !fs->mp)
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return OSKIT_E_INVALIDARG;
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ferror = getproc(&p);
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if (ferror)
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return ferror;
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error = VFS_ROOT(fs->mp, &vp);
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if (error)
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{
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prfree(p);
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return errno_to_oskit_error(error);
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}
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error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
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if (error)
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{
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vput(vp);
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prfree(p);
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return errno_to_oskit_error(error);
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}
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d = (oskit_dir_t *) hashtab_search(vptab, (hashtab_key_t) vp);
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if (d)
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{
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oskit_dir_addref(d);
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}
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else
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{
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d = (oskit_dir_t *) gfile_create(fs,vp);
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if (!d)
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{
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vput(vp);
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prfree(p);
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return OSKIT_ENOMEM;
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}
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}
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vput(vp);
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prfree(p);
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*out_dir = d;
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return 0;
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}
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static OSKIT_COMDECL filesystem_remount(oskit_filesystem_t *f,
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oskit_u32_t flags)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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struct mount *mp;
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struct proc *p;
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oskit_error_t ferror;
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int error, oflag;
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if (!fs || !fs->count || !fs->mp)
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return OSKIT_E_INVALIDARG;
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ferror = getproc(&p);
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if (ferror)
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return ferror;
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mp = fs->mp;
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/*
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* Only root, or the user that did the original mount is
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* permitted to update it.
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*/
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if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
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(error = suser(p->p_ucred, 0)))
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{
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prfree(p);
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return errno_to_oskit_error(error);
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}
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if (flags & OSKIT_FS_NOEXEC)
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mp->mnt_flag |= MNT_NOEXEC;
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if (flags & OSKIT_FS_NOSUID)
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mp->mnt_flag |= MNT_NOSUID;
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if (flags & OSKIT_FS_NODEV)
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mp->mnt_flag |= MNT_NODEV;
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oflag = mp->mnt_flag;
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if ((flags & OSKIT_FS_RDONLY) &&
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((mp->mnt_flag & MNT_RDONLY) == 0))
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/* rdwr -> rdonly */
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mp->mnt_flag |= (MNT_UPDATE | MNT_FORCE | MNT_RDONLY);
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if (((flags & OSKIT_FS_RDONLY) == 0) &&
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(mp->mnt_flag & MNT_RDONLY))
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/* rdonly -> rdwr */
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mp->mnt_flag |= (MNT_UPDATE | MNT_RELOAD | MNT_WANTRDWR);
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error = 0;
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if (mp->mnt_flag & MNT_UPDATE)
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{
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struct nameidata nd; /* dummy to contain cred */
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struct ucred cred; /* dummy, contents not actually used */
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nd.ni_cnd.cn_cred = &cred;
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error = VFS_MOUNT(mp, 0, 0, &nd, p);
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if (mp->mnt_flag & MNT_WANTRDWR)
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mp->mnt_flag &= ~MNT_RDONLY;
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mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR);
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if (error)
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mp->mnt_flag = oflag;
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}
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prfree(p);
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if (error)
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return errno_to_oskit_error(error);
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return 0;
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}
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static OSKIT_COMDECL filesystem_unmount(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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struct mount *mp;
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dev_t dev;
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struct proc *p;
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oskit_error_t ferror;
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int error;
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if (!fs || !fs->count || !fs->mp)
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return OSKIT_E_INVALIDARG;
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ferror = getproc(&p);
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if (ferror)
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return ferror;
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mp = fs->mp;
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/*
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* Only root, or the user that did the original mount is
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* permitted to forcibly unmount it.
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*/
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if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
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(error = suser(p->p_ucred, 0)))
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{
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prfree(p);
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return errno_to_oskit_error(error);
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}
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/* Get the blkio "pointed" to by the dev_t so we can release it below. */
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dev = ((struct ufsmount *)mp->mnt_data)->um_dev;
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error = dounmount(fs->mp, MNT_FORCE, p);
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fs->mp = 0;
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prfree(p);
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oskit_blkio_release((oskit_blkio_t *)dev);
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if (error)
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return errno_to_oskit_error(error);
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return 0;
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}
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static OSKIT_COMDECL
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filesystem_lookupi(oskit_filesystem_t *f, oskit_ino_t ino,
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oskit_file_t **out_file)
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{
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return OSKIT_E_NOTIMPL;
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}
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static struct oskit_filesystem_ops fs_ops = {
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filesystem_query,
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filesystem_addref,
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filesystem_release,
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filesystem_statfs,
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filesystem_sync,
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filesystem_getroot,
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filesystem_remount,
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filesystem_unmount,
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filesystem_lookupi,
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};
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