g_label_disk_ident.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 Ivan Voras <ivoras@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 
   37 #include <geom/geom.h>
   38 #include <geom/geom_disk.h>
   39 #include <geom/label/g_label.h>
   40 #include <geom/multipath/g_multipath.h>
   41 
   42 static char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME,
   43     NULL };
   44 
   45 static void
   46 g_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size)
   47 {
   48         struct g_class *cls;
   49         char ident[DISK_IDENT_SIZE];
   50         int ident_len, found, i;
   51 
   52         g_topology_assert_not();
   53         label[0] = '\0';
   54 
   55         cls = cp->provider->geom->class;
   56 
   57         /* 
   58          * Get the GEOM::ident string, and construct a label in the format
   59          * "CLASS_NAME-ident"
   60          */
   61         ident_len = sizeof(ident);
   62         if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) {
   63                 if (ident_len == 0 || ident[0] == '\0')
   64                         return;
   65                 for (i = 0, found = 0; classes_pass[i] != NULL; i++)
   66                         if (strcmp(classes_pass[i], cls->name) == 0) {
   67                                 found = 1;
   68                                 break;
   69                         }
   70                 if (!found)
   71                         return;
   72                 /*
   73                  * We can safely ignore the result of snprintf(): the label
   74                  * will simply be truncated, which at most is only annoying.
   75                  */
   76                 (void)snprintf(label, size, "%s-%s", cls->name, ident);
   77         }
   78 }
   79 
   80 struct g_label_desc g_label_disk_ident = {
   81         .ld_taste = g_label_disk_ident_taste,
   82         .ld_dirprefix = "diskid/",
   83         .ld_enabled = 1
   84 };
   85 
   86 G_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives "
   87     "which export a disk identification string");

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

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