1 /*- 2 * Copyright (c) 2012 Ivan Voras <ivoras@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/malloc.h> 34 35 #include <geom/geom.h> 36 #include <geom/geom_disk.h> 37 #include <geom/label/g_label.h> 38 #include <geom/multipath/g_multipath.h> 39 40 41 #define G_LABEL_DISK_IDENT_DIR "diskid" 42 43 static char* classes_pass[] = { G_DISK_CLASS_NAME, G_MULTIPATH_CLASS_NAME, 44 NULL }; 45 46 static void 47 g_label_disk_ident_taste(struct g_consumer *cp, char *label, size_t size) 48 { 49 struct g_class *cls; 50 char ident[100]; 51 int ident_len, found, i; 52 53 g_topology_assert_not(); 54 label[0] = '\0'; 55 56 cls = cp->provider->geom->class; 57 58 /* 59 * Get the GEOM::ident string, and construct a label in the format 60 * "CLASS_NAME-ident" 61 */ 62 ident_len = sizeof(ident); 63 if (g_io_getattr("GEOM::ident", cp, &ident_len, ident) == 0) { 64 if (ident_len == 0 || ident[0] == '\0') 65 return; 66 for (i = 0, found = 0; classes_pass[i] != NULL; i++) 67 if (strcmp(classes_pass[i], cls->name) == 0) { 68 found = 1; 69 break; 70 } 71 if (!found) 72 return; 73 /* 74 * We can safely ignore the result of snprintf(): the label 75 * will simply be truncated, which at most is only annoying. 76 */ 77 (void)snprintf(label, size, "%s-%s", cls->name, ident); 78 } 79 } 80 81 struct g_label_desc g_label_disk_ident = { 82 .ld_taste = g_label_disk_ident_taste, 83 .ld_dir = G_LABEL_DISK_IDENT_DIR, 84 .ld_enabled = 1 85 }; 86 87 G_LABEL_INIT(disk_ident, g_label_disk_ident, "Create device nodes for drives " 88 "which export a disk identification string"); 89