1 /* $NetBSD: pool_label.c,v 1.1.1.1 2008/12/22 00:17:51 haad Exp $ */ 2 3 /* 4 * Copyright (C) 1997-2004 Sistina Software, Inc. All rights reserved. 5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 6 * 7 * This file is part of LVM2. 8 * 9 * This copyrighted material is made available to anyone wishing to use, 10 * modify, copy, or redistribute it subject to the terms and conditions 11 * of the GNU Lesser General Public License v.2.1. 12 * 13 * You should have received a copy of the GNU Lesser General Public License 14 * along with this program; if not, write to the Free Software Foundation, 15 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 16 */ 17 18 #include "lib.h" 19 #include "label.h" 20 #include "metadata.h" 21 #include "xlate.h" 22 #include "disk_rep.h" 23 #include "pool_label.h" 24 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 28 static void _pool_not_supported(const char *op) 29 { 30 log_error("The '%s' operation is not supported for the pool labeller.", 31 op); 32 } 33 34 static int _pool_can_handle(struct labeller *l __attribute((unused)), void *buf, uint64_t sector) 35 { 36 37 struct pool_disk pd; 38 39 /* 40 * POOL label must always be in first sector 41 */ 42 if (sector) 43 return 0; 44 45 pool_label_in(&pd, buf); 46 47 /* can ignore 8 rightmost bits for ondisk format check */ 48 if ((pd.pl_magic == POOL_MAGIC) && 49 (pd.pl_version >> 8 == POOL_VERSION >> 8)) 50 return 1; 51 52 return 0; 53 } 54 55 static int _pool_write(struct label *label __attribute((unused)), void *buf __attribute((unused))) 56 { 57 _pool_not_supported("write"); 58 return 0; 59 } 60 61 static int _pool_read(struct labeller *l, struct device *dev, void *buf, 62 struct label **label) 63 { 64 struct pool_list pl; 65 66 return read_pool_label(&pl, l, dev, buf, label); 67 } 68 69 static int _pool_initialise_label(struct labeller *l __attribute((unused)), struct label *label) 70 { 71 strcpy(label->type, "POOL"); 72 73 return 1; 74 } 75 76 static void _pool_destroy_label(struct labeller *l __attribute((unused)), struct label *label __attribute((unused))) 77 { 78 return; 79 } 80 81 static void _label_pool_destroy(struct labeller *l) 82 { 83 dm_free(l); 84 } 85 86 struct label_ops _pool_ops = { 87 .can_handle = _pool_can_handle, 88 .write = _pool_write, 89 .read = _pool_read, 90 .verify = _pool_can_handle, 91 .initialise_label = _pool_initialise_label, 92 .destroy_label = _pool_destroy_label, 93 .destroy = _label_pool_destroy, 94 }; 95 96 struct labeller *pool_labeller_create(struct format_type *fmt) 97 { 98 struct labeller *l; 99 100 if (!(l = dm_malloc(sizeof(*l)))) { 101 log_error("Couldn't allocate labeller object."); 102 return NULL; 103 } 104 105 l->ops = &_pool_ops; 106 l->private = (const void *) fmt; 107 108 return l; 109 } 110