1 /* $NetBSD: dm.h,v 1.17 2009/12/29 23:37:48 haad Exp $ */ 2 3 /* 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Hamsik. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _DM_DEV_H_ 33 #define _DM_DEV_H_ 34 35 #ifdef _KERNEL 36 37 #include <sys/errno.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 41 #include <sys/types.h> 42 #include <cpu/inttypes.h> 43 #include <sys/condvar.h> 44 #include <sys/lock.h> 45 #include <sys/queue.h> 46 47 #include <sys/vnode.h> 48 #include <sys/buf.h> 49 #include <sys/device.h> 50 #include <sys/devicestat.h> 51 #include <sys/diskslice.h> 52 #include <sys/disklabel.h> 53 #include <sys/vfscache.h> 54 55 #include <libprop/proplib.h> 56 57 #define DM_VERSION_MAJOR 4 58 #define DM_VERSION_MINOR 16 59 #define DM_VERSION_PATCHLEVEL 0 60 61 #define DM_MAX_TYPE_NAME 16 62 #define DM_MAX_DEV_NAME 32 63 #define DM_MAX_PARAMS_SIZE 1024 64 65 #define DM_NAME_LEN 128 66 #define DM_UUID_LEN 129 67 68 #define DM_TABLE_ACTIVE 0 69 #define DM_TABLE_INACTIVE 1 70 71 typedef struct dm_mapping { 72 union { 73 struct dm_pdev *pdev; 74 } data; 75 TAILQ_ENTRY(dm_mapping) next; 76 } dm_mapping_t; 77 78 /* 79 * A device mapper table is a list of physical ranges plus the mapping target 80 * applied to them. 81 */ 82 typedef struct dm_table_entry { 83 struct dm_dev *dev; /* backlink */ 84 uint64_t start; 85 uint64_t length; 86 87 struct dm_target *target; /* Link to table target. */ 88 void *target_config; /* Target specific data. */ 89 TAILQ_ENTRY(dm_table_entry) next; 90 91 TAILQ_HEAD(, dm_mapping) pdev_maps; 92 } dm_table_entry_t; 93 94 TAILQ_HEAD(dm_table, dm_table_entry); 95 96 typedef struct dm_table dm_table_t; 97 98 typedef struct dm_table_head { 99 /* Current active table is selected with this. */ 100 int cur_active_table; 101 struct dm_table tables[2]; 102 103 struct lock table_mtx; 104 105 int io_cnt; 106 } dm_table_head_t; 107 108 /* 109 * This structure is used to store opened vnodes for disk with name. 110 * I need this because devices can be opened only once, but I can 111 * have more then one device on one partition. 112 */ 113 typedef struct dm_pdev { 114 char name[DM_MAX_DEV_NAME]; 115 char udev_name[DM_MAX_DEV_NAME]; 116 udev_t udev; 117 struct partinfo pdev_pinfo; /* partinfo of the underlying device */ 118 119 struct vnode *pdev_vnode; 120 int ref_cnt; /* reference counter for users ofthis pdev */ 121 122 TAILQ_ENTRY(dm_pdev) next_pdev; 123 } dm_pdev_t; 124 125 /* 126 * This structure is called for every device-mapper device. 127 * It points to TAILQ of device tables and mirrored, snapshoted etc. devices. 128 */ 129 typedef struct dm_dev { 130 char name[DM_NAME_LEN]; 131 char uuid[DM_UUID_LEN]; 132 133 cdev_t devt; /* pointer to autoconf device_t structure */ 134 uint64_t minor; 135 uint32_t flags; /* store communication protocol flags */ 136 137 struct lock dev_mtx; /* mutex for general device lock */ 138 struct cv dev_cv; /* cv for between ioctl synchronization */ 139 140 /* uint32_t event_nr; */ 141 uint32_t ref_cnt; 142 143 uint32_t is_open; 144 145 dm_table_head_t table_head; 146 147 struct disk *diskp; 148 149 struct devstat stats; 150 151 TAILQ_ENTRY(dm_dev) next_devlist; /* Major device list. */ 152 } dm_dev_t; 153 154 /* 155 * Target config is initiated with dm_target_init function. 156 */ 157 158 /* constant dm_target structures for error, zero, linear, stripes etc. */ 159 typedef struct dm_target { 160 char name[DM_MAX_TYPE_NAME]; 161 162 int (*init)(dm_table_entry_t *, int, char **); 163 int (*destroy)(dm_table_entry_t *); 164 int (*strategy)(dm_table_entry_t *, struct buf *); /* Mandatory */ 165 char *(*table)(void *); /* DM_STATUS_TABLE_FLAG */ 166 char *(*info)(void *); /* !DM_STATUS_TABLE_FLAG */ 167 int (*dump)(dm_table_entry_t *, void *data, size_t length, off_t offset); 168 int (*message)(dm_table_entry_t *, char *); 169 170 uint32_t version[3]; 171 int ref_cnt; 172 int max_argc; 173 174 TAILQ_ENTRY(dm_target) dm_target_next; 175 } dm_target_t; 176 177 /* device-mapper.c */ 178 void dmsetdiskinfo(struct disk *, dm_table_head_t *); 179 uint64_t atoi64(const char *); 180 char *dm_alloc_string(int len); 181 void dm_builtin_init(void *); 182 void dm_builtin_uninit(void *); 183 MALLOC_DECLARE(M_DM); 184 extern int dm_debug_level; 185 186 /* dm_ioctl.c */ 187 int dm_list_versions_ioctl(prop_dictionary_t); 188 int dm_dev_create_ioctl(prop_dictionary_t); 189 int dm_dev_list_ioctl(prop_dictionary_t); 190 int dm_dev_rename_ioctl(prop_dictionary_t); 191 int dm_dev_remove_ioctl(prop_dictionary_t); 192 int dm_dev_remove_all_ioctl(prop_dictionary_t); 193 int dm_dev_status_ioctl(prop_dictionary_t); 194 int dm_dev_suspend_ioctl(prop_dictionary_t); 195 int dm_dev_resume_ioctl(prop_dictionary_t); 196 int dm_table_clear_ioctl(prop_dictionary_t); 197 int dm_table_deps_ioctl(prop_dictionary_t); 198 int dm_table_load_ioctl(prop_dictionary_t); 199 int dm_table_status_ioctl(prop_dictionary_t); 200 int dm_message_ioctl(prop_dictionary_t); 201 int dm_check_version(prop_dictionary_t); 202 203 /* dm_target.c */ 204 void dm_target_busy(dm_target_t *); 205 void dm_target_unbusy(dm_target_t *); 206 dm_target_t* dm_target_autoload(const char *); 207 dm_target_t* dm_target_lookup(const char *); 208 int dm_target_insert(dm_target_t *); 209 int dm_target_remove(char *); 210 dm_target_t* dm_target_alloc(const char *); 211 int dm_target_free(dm_target_t *); 212 prop_array_t dm_target_prop_list(void); 213 int dm_target_init(void); 214 int dm_target_uninit(void); 215 216 /* dm_table.c */ 217 dm_table_t *dm_table_get_entry(dm_table_head_t *, uint8_t); 218 void dm_table_release(dm_table_head_t *, uint8_t s); 219 void dm_table_switch_tables(dm_table_head_t *); 220 int dm_table_destroy(dm_table_head_t *, uint8_t); 221 uint64_t dm_table_size(dm_table_head_t *); 222 uint64_t dm_inactive_table_size(dm_table_head_t *); 223 int dm_table_get_target_count(dm_table_head_t *, uint8_t); 224 void dm_table_head_init(dm_table_head_t *); 225 void dm_table_head_destroy(dm_table_head_t *); 226 void dm_table_init_target(dm_table_entry_t *table_en, void *cfg); 227 int dm_table_add_deps(dm_table_entry_t *table_en, dm_pdev_t *pdev); 228 void dm_table_free_deps(dm_table_entry_t *table_en); 229 230 /* dm_dev.c */ 231 dm_dev_t* dm_dev_lookup(const char *, const char *, int); 232 int dm_dev_insert(dm_dev_t *); 233 #if 0 234 dm_dev_t* dm_dev_lookup_evict(const char *, const char *, int); 235 #endif 236 int dm_dev_create(dm_dev_t **, const char *, const char *, int); 237 int dm_dev_remove(dm_dev_t *); 238 int dm_dev_remove_all(int); 239 void dm_dev_busy(dm_dev_t *); 240 void dm_dev_unbusy(dm_dev_t *); 241 prop_array_t dm_dev_prop_list(void); 242 int dm_dev_init(void); 243 int dm_dev_uninit(void); 244 245 /* dm_pdev.c */ 246 off_t dm_pdev_correct_dump_offset(dm_pdev_t *, off_t); 247 dm_pdev_t* dm_pdev_insert(const char *); 248 int dm_pdev_decr(dm_pdev_t *); 249 uint64_t dm_pdev_get_udev(dm_pdev_t *); 250 int dm_pdev_get_vattr(dm_pdev_t *, struct vattr *); 251 int dm_pdev_init(void); 252 int dm_pdev_uninit(void); 253 254 #define dmdebug(format, ...) \ 255 do { if (dm_debug_level) kprintf("%s: "format, __func__, ## __VA_ARGS__); } while(0) 256 257 #define DM_TARGET_MODULE(name, evh) \ 258 static moduledata_t name##_mod = { \ 259 #name, \ 260 evh, \ 261 NULL \ 262 }; \ 263 DECLARE_MODULE(name, name##_mod, SI_SUB_DM_TARGETS, \ 264 SI_ORDER_ANY); \ 265 MODULE_DEPEND(name, dm, 1, 1, 1) 266 267 #define DM_TARGET_BUILTIN(name, evh) \ 268 SYSINIT(name##module, SI_SUB_DM_TARGETS, SI_ORDER_ANY, \ 269 dm_builtin_init, evh); \ 270 SYSUNINIT(name##module, SI_SUB_DM_TARGETS, SI_ORDER_ANY, \ 271 dm_builtin_uninit, evh) 272 273 #endif /*_KERNEL*/ 274 275 #endif /*_DM_DEV_H_*/ 276