FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_slice.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 2002 Poul-Henning Kamp
      * Copyright (c) 2002 Networks Associates Technology, Inc.
      * All rights reserved.
      *
      * This software was developed for the FreeBSD Project by Poul-Henning Kamp
      * and NAI Labs, the Security Research Division of Network Associates, Inc.
     * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
     * DARPA CHATS research program.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The names of the authors may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/geom/geom_slice.h 326270 2017-11-27 15:17:37Z pfg $
     */
    
    #ifndef _GEOM_GEOM_SLICE_H_
    #define _GEOM_GEOM_SLICE_H_
    
    struct g_slice {
            off_t   offset;
            off_t   length;
            u_int   sectorsize;
            struct  g_provider *provider;
    };
    
    struct g_slice_hot {
            off_t   offset;
            off_t   length;
            int     ract;
            int     dact;
            int     wact;
    };
    
    typedef int g_slice_start_t (struct bio *bp);
    
    struct g_slicer {
            u_int                   nslice;
            u_int                   nprovider;
            struct g_slice          *slices;
    
            u_int                   nhotspot;
            struct g_slice_hot      *hotspot;
    
            void                    *softc;
            g_slice_start_t         *start;
            g_event_t               *hot;
    };
    
    g_dumpconf_t g_slice_dumpconf;
    int g_slice_config(struct g_geom *gp, u_int idx, int how, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...) __printflike(7, 8);
    void g_slice_spoiled(struct g_consumer *cp);
    void g_slice_orphan(struct g_consumer *cp);
    #define G_SLICE_CONFIG_CHECK    0
    #define G_SLICE_CONFIG_SET      1
    #define G_SLICE_CONFIG_FORCE    2
    struct g_geom * g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start);
    
    int g_slice_conf_hot(struct g_geom *gp, u_int idx, off_t offset, off_t length, int ract, int dact, int wact);
    #define G_SLICE_HOT_ALLOW       1
    #define G_SLICE_HOT_DENY        2
    #define G_SLICE_HOT_START       4
    #define G_SLICE_HOT_CALL        8
    
    int g_slice_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp);
    
    void g_slice_finish_hot(struct bio *bp);
    
    #endif /* _GEOM_GEOM_SLICE_H_ */

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