FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_flashmap.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org>
      *
      * 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.
     *
     * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/slicer.h>
    
    #include <geom/geom.h>
    #include <geom/geom_flashmap.h>
    #include <geom/geom_slice.h>
    #include <geom/label/g_label.h>
    
    static void
    g_label_flashmap_taste(struct g_consumer *cp, char *label, size_t size)
    {
            struct g_flashmap *gfp;
            struct g_slicer *gsp;
            struct g_provider *pp;
    
            g_topology_assert_not();
    
            pp = cp->provider;
            label[0] = '\0';
    
            /* We taste only partitions handled by flashmap */
            if (strncmp(pp->geom->class->name, FLASHMAP_CLASS_NAME,
                sizeof(FLASHMAP_CLASS_NAME)) != 0)
                    return;
    
            gsp = (struct g_slicer *)pp->geom->softc;
            gfp = (struct g_flashmap *)gsp->softc;
    
            /* If it's handled by flashmap it should have a label, but be safe. */
            if (gfp->labels[pp->index] == NULL)
                    return;
    
            strlcpy(label, gfp->labels[pp->index], size);
    }
    
    struct g_label_desc g_label_flashmap = {
            .ld_taste = g_label_flashmap_taste,
            .ld_dirprefix = "flash/",
            .ld_enabled = 1
    };
    
    G_LABEL_INIT(flashmap, g_label_flashmap, "Create device nodes for Flashmap labels");

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