g_label_disk_ident.c revision 249564
166458Sdfr/*- 266458Sdfr * Copyright (c) 2012 Ivan Voras <ivoras@FreeBSD.org> 366458Sdfr * All rights reserved. 4139790Simp * 566458Sdfr * Redistribution and use in source and binary forms, with or without 666458Sdfr * modification, are permitted provided that the following conditions 766458Sdfr * are met: 866458Sdfr * 1. Redistributions of source code must retain the above copyright 966458Sdfr * notice, this list of conditions and the following disclaimer. 1066458Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1166458Sdfr * notice, this list of conditions and the following disclaimer in the 1266458Sdfr * documentation and/or other materials provided with the distribution. 1366458Sdfr * 1466458Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 1566458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1666458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1766458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 1866458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1966458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2066458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2166458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2266458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2366458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2466458Sdfr * SUCH DAMAGE. 2566458Sdfr */ 2666458Sdfr 2766458Sdfr#include <sys/cdefs.h> 2866458Sdfr__FBSDID("$FreeBSD: head/sys/geom/label/g_label_disk_ident.c 249564 2013-04-16 19:58:24Z ivoras $"); 2966458Sdfr 3066458Sdfr#include <sys/param.h> 3166458Sdfr#include <sys/systm.h> 3266458Sdfr#include <sys/kernel.h> 3366458Sdfr#include <sys/malloc.h> 3466458Sdfr 35113941Skan#include <geom/geom.h> 36113941Skan#include <geom/geom_disk.h> 3766458Sdfr#include <geom/label/g_label.h> 38114678Skan#include <geom/multipath/g_multipath.h> 39114678Skan 40114678Skan 41114678Skan#define G_LABEL_DISK_IDENT_DIR "diskid" 42114678Skan 43114678Skanstatic char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME, 44114678Skan NULL }; 45114678Skan 46114678Skanstatic void 47114678Skang_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size) 48114678Skan{ 49115164Skan struct g_class *cls; 50115164Skan char ident[100]; 51113941Skan int ident_len, found, i; 52113941Skan 5366458Sdfr g_topology_assert_not(); 54113941Skan label[0] = '\0'; 5566458Sdfr 56113941Skan cls = cp->provider->geom->class; 57113941Skan 58113941Skan /* 5966458Sdfr * Get the GEOM::ident string, and construct a label in the format 60113941Skan * "CLASS_NAME-ident" 61113941Skan */ 62113941Skan ident_len = sizeof(ident); 6366458Sdfr if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) { 64113941Skan if (ident_len == 0 || ident[0] == '\0') 65113941Skan return; 66113941Skan for (i = 0, found = 0; classes_pass[i] != NULL; i++) 67113941Skan if (strcmp(classes_pass[i], cls->name) == 0) { 6867488Sobrien found = 1; 6967488Sobrien break; 70113941Skan } 71113941Skan if (!found) 72113941Skan return; 7367488Sobrien /* 74113941Skan * We can safely ignore the result of strncpy; the label will 7566458Sdfr * simply be truncated, which at most is only annoying. 76113941Skan */ 7766458Sdfr (void)snprintf(label, size, "%s-%s", cls->name, ident); 78113941Skan } 79113941Skan} 8081720Sache 8167488Sobrienstruct g_label_desc g_label_disk_ident = { 82113941Skan .ld_taste = g_label_disk_ident_taste, 83113941Skan .ld_dir = G_LABEL_DISK_IDENT_DIR, 84113941Skan .ld_enabled = 1 8566458Sdfr}; 86113941Skan 87113941SkanG_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives " 8866458Sdfr "which export a disk identification string"); 89113941Skan