mirror of https://github.com/dzavalishin/oskit/
284 lines
7.7 KiB
C
Executable File
284 lines
7.7 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/com.h>
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#include <oskit/com/wrapper.h>
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#include <oskit/c/string.h>
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#include <oskit/boolean.h>
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#include <oskit/io/absio.h>
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#include <oskit/com/stream.h>
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#include <oskit/fs/filesystem.h>
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#include <oskit/fs/file.h>
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#include <oskit/fs/dir.h>
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#include <oskit/fs/openfile.h>
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#include <oskit/c/assert.h>
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#include <oskit/c/malloc.h>
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/*
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* Wrappers for oskit_filesysem component.
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*/
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struct gfilesystem {
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oskit_filesystem_t fsi; /* COM file interface */
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int count;
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oskit_filesystem_t *w_fsi; /* Wrapped COM FS interface */
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void (*before)(void *);
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void (*after)(void *);
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void *cookie;
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};
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#define WRAPPERCALL(g, ops, iface, call, args...) ({ \
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oskit_error_t __err; \
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g->before(g->cookie); \
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__err = oskit_##iface##_##call(g->w_##ops ,##args); \
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DEBUGWRAPPER(iface, call, __err); \
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g->after(g->cookie); \
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__err; })
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#define WRAPPERCALL_NOARGS(g, ops, iface, call) ({ \
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oskit_error_t __err; \
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g->before(g->cookie); \
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__err = oskit_##iface##_##call(g->w_##ops); \
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DEBUGWRAPPER(iface, call, __err); \
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g->after(g->cookie); \
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__err; })
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/*
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* oskit_filesystem methods
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*/
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static OSKIT_COMDECL
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filesystem_query(oskit_filesystem_t *f,
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const struct oskit_guid *iid, void **out_ihandle)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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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->before(fs->cookie);
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++fs->count;
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fs->after(fs->cookie);
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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
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filesystem_addref(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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unsigned newcount;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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fs->before(fs->cookie);
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newcount = ++fs->count;
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fs->after(fs->cookie);
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return newcount;
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}
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static OSKIT_COMDECL_U
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filesystem_release(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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unsigned newcount;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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fs->before(fs->cookie);
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if ((newcount = --fs->count) == 0) {
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if (fs->w_fsi)
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oskit_filesystem_release(fs->w_fsi);
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fs->after(fs->cookie);
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free(fs);
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}
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else
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fs->after(fs->cookie);
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return newcount;
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}
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static OSKIT_COMDECL
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filesystem_statfs(oskit_filesystem_t *f, oskit_statfs_t *out_stats)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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oskit_error_t err;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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err = WRAPPERCALL(fs, fsi, filesystem, statfs, out_stats);
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return err;
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}
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static OSKIT_COMDECL
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filesystem_sync(oskit_filesystem_t *f, oskit_bool_t wait)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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oskit_error_t err;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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err = WRAPPERCALL(fs, fsi, filesystem, sync, wait);
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return err;
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}
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static OSKIT_COMDECL
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filesystem_getroot(oskit_filesystem_t *f, 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 *newdir;
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oskit_error_t err;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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err = WRAPPERCALL(fs, fsi, filesystem, getroot, &newdir);
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if (err == 0) {
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err = oskit_wrap_dir(newdir,
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fs->before, fs->after, fs->cookie,
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out_dir);
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if (err == 0)
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oskit_dir_release(newdir);
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}
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return err;
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}
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static OSKIT_COMDECL
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filesystem_remount(oskit_filesystem_t *f, oskit_u32_t flags)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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oskit_error_t err;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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err = WRAPPERCALL(fs, fsi, filesystem, remount, flags);
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return err;
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}
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static OSKIT_COMDECL
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filesystem_unmount(oskit_filesystem_t *f)
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{
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struct gfilesystem *fs = (struct gfilesystem *) f;
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oskit_error_t err;
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if (!fs || !fs->count)
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return OSKIT_E_INVALIDARG;
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err = WRAPPERCALL(fs, fsi, filesystem, unmount);
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return err;
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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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};
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/*
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* oskit_filesystem wrapper constructor.
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*/
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oskit_error_t
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oskit_wrap_filesystem(oskit_filesystem_t *in,
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void (*before)(),
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void (*after)(),
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void *cookie,
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oskit_filesystem_t **out)
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{
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struct gfilesystem *newfs = malloc(sizeof(*newfs));
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if (newfs == NULL)
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return OSKIT_ENOMEM;
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memset(newfs, 0, sizeof(*newfs));
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newfs->count = 1;
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newfs->fsi.ops = &fs_ops;
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newfs->w_fsi = in;
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oskit_filesystem_addref(in);
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newfs->before = before;
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newfs->after = after;
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newfs->cookie = cookie;
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*out = &newfs->fsi;
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return 0;
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}
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