Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003 Sistina Software |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * This file is released under the LGPL. |
| 6 | */ |
| 7 | |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/slab.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/vmalloc.h> |
Alasdair G Kergon | a765e20 | 2008-04-24 22:02:01 +0100 | [diff] [blame] | 12 | #include <linux/dm-io.h> |
| 13 | #include <linux/dm-dirty-log.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
Mikulas Patocka | 586e80e | 2008-10-21 17:44:59 +0100 | [diff] [blame] | 15 | #include <linux/device-mapper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 17 | #define DM_MSG_PREFIX "dirty region log" |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 18 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 19 | struct dm_dirty_log_internal { |
| 20 | struct dm_dirty_log_type *type; |
| 21 | |
| 22 | struct list_head list; |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 23 | }; |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static LIST_HEAD(_log_types); |
| 26 | static DEFINE_SPINLOCK(_lock); |
| 27 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 28 | static struct dm_dirty_log_internal *__find_dirty_log_type(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 30 | struct dm_dirty_log_internal *log_type; |
| 31 | |
| 32 | list_for_each_entry(log_type, &_log_types, list) |
| 33 | if (!strcmp(name, log_type->type->name)) |
| 34 | return log_type; |
| 35 | |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | static struct dm_dirty_log_internal *_get_dirty_log_type(const char *name) |
| 40 | { |
| 41 | struct dm_dirty_log_internal *log_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | spin_lock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 44 | |
| 45 | log_type = __find_dirty_log_type(name); |
Mike Snitzer | 84e67c9 | 2009-04-02 19:55:29 +0100 | [diff] [blame^] | 46 | if (log_type && !try_module_get(log_type->type->module)) |
| 47 | log_type = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | spin_unlock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 50 | |
| 51 | return log_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } |
| 53 | |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 54 | /* |
| 55 | * get_type |
| 56 | * @type_name |
| 57 | * |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 58 | * Attempt to retrieve the dm_dirty_log_type by name. If not already |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 59 | * available, attempt to load the appropriate module. |
| 60 | * |
| 61 | * Log modules are named "dm-log-" followed by the 'type_name'. |
| 62 | * Modules may contain multiple types. |
| 63 | * This function will first try the module "dm-log-<type_name>", |
| 64 | * then truncate 'type_name' on the last '-' and try again. |
| 65 | * |
| 66 | * For example, if type_name was "clustered-disk", it would search |
| 67 | * 'dm-log-clustered-disk' then 'dm-log-clustered'. |
| 68 | * |
| 69 | * Returns: dirty_log_type* on success, NULL on failure |
| 70 | */ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 71 | static struct dm_dirty_log_type *get_type(const char *type_name) |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 72 | { |
| 73 | char *p, *type_name_dup; |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 74 | struct dm_dirty_log_internal *log_type; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 75 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 76 | if (!type_name) |
| 77 | return NULL; |
| 78 | |
| 79 | log_type = _get_dirty_log_type(type_name); |
| 80 | if (log_type) |
| 81 | return log_type->type; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 82 | |
| 83 | type_name_dup = kstrdup(type_name, GFP_KERNEL); |
| 84 | if (!type_name_dup) { |
| 85 | DMWARN("No memory left to attempt log module load for \"%s\"", |
| 86 | type_name); |
| 87 | return NULL; |
| 88 | } |
| 89 | |
| 90 | while (request_module("dm-log-%s", type_name_dup) || |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 91 | !(log_type = _get_dirty_log_type(type_name))) { |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 92 | p = strrchr(type_name_dup, '-'); |
| 93 | if (!p) |
| 94 | break; |
| 95 | p[0] = '\0'; |
| 96 | } |
| 97 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 98 | if (!log_type) |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 99 | DMWARN("Module for logging type \"%s\" not found.", type_name); |
| 100 | |
| 101 | kfree(type_name_dup); |
| 102 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 103 | return log_type ? log_type->type : NULL; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 104 | } |
| 105 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 106 | static void put_type(struct dm_dirty_log_type *type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 108 | struct dm_dirty_log_internal *log_type; |
| 109 | |
| 110 | if (!type) |
| 111 | return; |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | spin_lock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 114 | log_type = __find_dirty_log_type(type->name); |
| 115 | if (!log_type) |
| 116 | goto out; |
| 117 | |
Mike Snitzer | 84e67c9 | 2009-04-02 19:55:29 +0100 | [diff] [blame^] | 118 | module_put(type->module); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 119 | |
| 120 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | spin_unlock(&_lock); |
| 122 | } |
| 123 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 124 | static struct dm_dirty_log_internal *_alloc_dirty_log_type(struct dm_dirty_log_type *type) |
| 125 | { |
| 126 | struct dm_dirty_log_internal *log_type = kzalloc(sizeof(*log_type), |
| 127 | GFP_KERNEL); |
| 128 | |
| 129 | if (log_type) |
| 130 | log_type->type = type; |
| 131 | |
| 132 | return log_type; |
| 133 | } |
| 134 | |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 135 | int dm_dirty_log_type_register(struct dm_dirty_log_type *type) |
| 136 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 137 | struct dm_dirty_log_internal *log_type = _alloc_dirty_log_type(type); |
| 138 | int r = 0; |
| 139 | |
| 140 | if (!log_type) |
| 141 | return -ENOMEM; |
| 142 | |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 143 | spin_lock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 144 | if (!__find_dirty_log_type(type->name)) |
| 145 | list_add(&log_type->list, &_log_types); |
| 146 | else { |
| 147 | kfree(log_type); |
| 148 | r = -EEXIST; |
| 149 | } |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 150 | spin_unlock(&_lock); |
| 151 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 152 | return r; |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 153 | } |
| 154 | EXPORT_SYMBOL(dm_dirty_log_type_register); |
| 155 | |
| 156 | int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) |
| 157 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 158 | struct dm_dirty_log_internal *log_type; |
| 159 | |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 160 | spin_lock(&_lock); |
| 161 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 162 | log_type = __find_dirty_log_type(type->name); |
| 163 | if (!log_type) { |
| 164 | spin_unlock(&_lock); |
| 165 | return -EINVAL; |
| 166 | } |
| 167 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 168 | list_del(&log_type->list); |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 169 | |
| 170 | spin_unlock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 171 | kfree(log_type); |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | EXPORT_SYMBOL(dm_dirty_log_type_unregister); |
| 176 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 177 | struct dm_dirty_log *dm_dirty_log_create(const char *type_name, |
| 178 | struct dm_target *ti, |
| 179 | unsigned int argc, char **argv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 181 | struct dm_dirty_log_type *type; |
| 182 | struct dm_dirty_log *log; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | log = kmalloc(sizeof(*log), GFP_KERNEL); |
| 185 | if (!log) |
| 186 | return NULL; |
| 187 | |
| 188 | type = get_type(type_name); |
| 189 | if (!type) { |
| 190 | kfree(log); |
| 191 | return NULL; |
| 192 | } |
| 193 | |
| 194 | log->type = type; |
| 195 | if (type->ctr(log, ti, argc, argv)) { |
| 196 | kfree(log); |
| 197 | put_type(type); |
| 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | return log; |
| 202 | } |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 203 | EXPORT_SYMBOL(dm_dirty_log_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 205 | void dm_dirty_log_destroy(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
| 207 | log->type->dtr(log); |
| 208 | put_type(log->type); |
| 209 | kfree(log); |
| 210 | } |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 211 | EXPORT_SYMBOL(dm_dirty_log_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /*----------------------------------------------------------------- |
| 214 | * Persistent and core logs share a lot of their implementation. |
| 215 | * FIXME: need a reload method to be called from a resume |
| 216 | *---------------------------------------------------------------*/ |
| 217 | /* |
| 218 | * Magic for persistent mirrors: "MiRr" |
| 219 | */ |
| 220 | #define MIRROR_MAGIC 0x4D695272 |
| 221 | |
| 222 | /* |
| 223 | * The on-disk version of the metadata. |
| 224 | */ |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 225 | #define MIRROR_DISK_VERSION 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | #define LOG_OFFSET 2 |
| 227 | |
| 228 | struct log_header { |
| 229 | uint32_t magic; |
| 230 | |
| 231 | /* |
| 232 | * Simple, incrementing version. no backward |
| 233 | * compatibility. |
| 234 | */ |
| 235 | uint32_t version; |
| 236 | sector_t nr_regions; |
| 237 | }; |
| 238 | |
| 239 | struct log_c { |
| 240 | struct dm_target *ti; |
| 241 | int touched; |
| 242 | uint32_t region_size; |
| 243 | unsigned int region_count; |
| 244 | region_t sync_count; |
| 245 | |
| 246 | unsigned bitset_uint32_count; |
| 247 | uint32_t *clean_bits; |
| 248 | uint32_t *sync_bits; |
| 249 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ |
| 250 | |
| 251 | int sync_search; |
| 252 | |
| 253 | /* Resync flag */ |
| 254 | enum sync { |
| 255 | DEFAULTSYNC, /* Synchronize if necessary */ |
| 256 | NOSYNC, /* Devices known to be already in sync */ |
| 257 | FORCESYNC, /* Force a sync to happen */ |
| 258 | } sync; |
| 259 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 260 | struct dm_io_request io_req; |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
| 263 | * Disk log fields |
| 264 | */ |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 265 | int log_dev_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | struct dm_dev *log_dev; |
| 267 | struct log_header header; |
| 268 | |
Heinz Mauelshagen | 22a1ceb | 2008-04-24 21:43:17 +0100 | [diff] [blame] | 269 | struct dm_io_region header_location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | struct log_header *disk_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | }; |
| 272 | |
| 273 | /* |
| 274 | * The touched member needs to be updated every time we access |
| 275 | * one of the bitsets. |
| 276 | */ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 277 | static inline int log_test_bit(uint32_t *bs, unsigned bit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 279 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | static inline void log_set_bit(struct log_c *l, |
| 283 | uint32_t *bs, unsigned bit) |
| 284 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 285 | ext2_set_bit(bit, (unsigned long *) bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | l->touched = 1; |
| 287 | } |
| 288 | |
| 289 | static inline void log_clear_bit(struct log_c *l, |
| 290 | uint32_t *bs, unsigned bit) |
| 291 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 292 | ext2_clear_bit(bit, (unsigned long *) bs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | l->touched = 1; |
| 294 | } |
| 295 | |
| 296 | /*---------------------------------------------------------------- |
| 297 | * Header IO |
| 298 | *--------------------------------------------------------------*/ |
| 299 | static void header_to_disk(struct log_header *core, struct log_header *disk) |
| 300 | { |
| 301 | disk->magic = cpu_to_le32(core->magic); |
| 302 | disk->version = cpu_to_le32(core->version); |
| 303 | disk->nr_regions = cpu_to_le64(core->nr_regions); |
| 304 | } |
| 305 | |
| 306 | static void header_from_disk(struct log_header *core, struct log_header *disk) |
| 307 | { |
| 308 | core->magic = le32_to_cpu(disk->magic); |
| 309 | core->version = le32_to_cpu(disk->version); |
| 310 | core->nr_regions = le64_to_cpu(disk->nr_regions); |
| 311 | } |
| 312 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 313 | static int rw_header(struct log_c *lc, int rw) |
| 314 | { |
| 315 | lc->io_req.bi_rw = rw; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 316 | |
| 317 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); |
| 318 | } |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | static int read_header(struct log_c *log) |
| 321 | { |
| 322 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 324 | r = rw_header(log, READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | if (r) |
| 326 | return r; |
| 327 | |
| 328 | header_from_disk(&log->header, log->disk_header); |
| 329 | |
| 330 | /* New log required? */ |
| 331 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { |
| 332 | log->header.magic = MIRROR_MAGIC; |
| 333 | log->header.version = MIRROR_DISK_VERSION; |
| 334 | log->header.nr_regions = 0; |
| 335 | } |
| 336 | |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 337 | #ifdef __LITTLE_ENDIAN |
| 338 | if (log->header.version == 1) |
| 339 | log->header.version = 2; |
| 340 | #endif |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (log->header.version != MIRROR_DISK_VERSION) { |
| 343 | DMWARN("incompatible disk log version"); |
| 344 | return -EINVAL; |
| 345 | } |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | |
Milan Broz | 2045e88 | 2009-01-06 03:05:01 +0000 | [diff] [blame] | 350 | static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
| 351 | { |
| 352 | if (region_size < 2 || region_size > ti->len) |
| 353 | return 0; |
| 354 | |
| 355 | if (!is_power_of_2(region_size)) |
| 356 | return 0; |
| 357 | |
| 358 | return 1; |
| 359 | } |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | /*---------------------------------------------------------------- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | * core log constructor/destructor |
| 363 | * |
| 364 | * argv contains region_size followed optionally by [no]sync |
| 365 | *--------------------------------------------------------------*/ |
| 366 | #define BYTE_SHIFT 3 |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 367 | static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 368 | unsigned int argc, char **argv, |
| 369 | struct dm_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
| 371 | enum sync sync = DEFAULTSYNC; |
| 372 | |
| 373 | struct log_c *lc; |
| 374 | uint32_t region_size; |
| 375 | unsigned int region_count; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 376 | size_t bitset_size, buf_size; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 377 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | if (argc < 1 || argc > 2) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 380 | DMWARN("wrong number of arguments to dirty region log"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | return -EINVAL; |
| 382 | } |
| 383 | |
| 384 | if (argc > 1) { |
| 385 | if (!strcmp(argv[1], "sync")) |
| 386 | sync = FORCESYNC; |
| 387 | else if (!strcmp(argv[1], "nosync")) |
| 388 | sync = NOSYNC; |
| 389 | else { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 390 | DMWARN("unrecognised sync argument to " |
| 391 | "dirty region log: %s", argv[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | return -EINVAL; |
| 393 | } |
| 394 | } |
| 395 | |
Milan Broz | 2045e88 | 2009-01-06 03:05:01 +0000 | [diff] [blame] | 396 | if (sscanf(argv[0], "%u", ®ion_size) != 1 || |
| 397 | !_check_region_size(ti, region_size)) { |
| 398 | DMWARN("invalid region size %s", argv[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | return -EINVAL; |
| 400 | } |
| 401 | |
| 402 | region_count = dm_sector_div_up(ti->len, region_size); |
| 403 | |
| 404 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); |
| 405 | if (!lc) { |
| 406 | DMWARN("couldn't allocate core log"); |
| 407 | return -ENOMEM; |
| 408 | } |
| 409 | |
| 410 | lc->ti = ti; |
| 411 | lc->touched = 0; |
| 412 | lc->region_size = region_size; |
| 413 | lc->region_count = region_count; |
| 414 | lc->sync = sync; |
| 415 | |
| 416 | /* |
Alasdair G Kergon | 0e56822 | 2005-11-21 21:32:34 -0800 | [diff] [blame] | 417 | * Work out how many "unsigned long"s we need to hold the bitset. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | */ |
| 419 | bitset_size = dm_round_up(region_count, |
Alasdair G Kergon | 29121bd | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 420 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | bitset_size >>= BYTE_SHIFT; |
| 422 | |
Alasdair G Kergon | 29121bd | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 423 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 424 | |
| 425 | /* |
| 426 | * Disk log? |
| 427 | */ |
| 428 | if (!dev) { |
| 429 | lc->clean_bits = vmalloc(bitset_size); |
| 430 | if (!lc->clean_bits) { |
| 431 | DMWARN("couldn't allocate clean bitset"); |
| 432 | kfree(lc); |
| 433 | return -ENOMEM; |
| 434 | } |
| 435 | lc->disk_header = NULL; |
| 436 | } else { |
| 437 | lc->log_dev = dev; |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 438 | lc->log_dev_failed = 0; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 439 | lc->header_location.bdev = lc->log_dev->bdev; |
| 440 | lc->header_location.sector = 0; |
| 441 | |
| 442 | /* |
| 443 | * Buffer holds both header and bitset. |
| 444 | */ |
| 445 | buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + |
| 446 | bitset_size, ti->limits.hardsect_size); |
Milan Broz | ac1f0ac | 2009-01-06 03:05:02 +0000 | [diff] [blame] | 447 | |
| 448 | if (buf_size > dev->bdev->bd_inode->i_size) { |
| 449 | DMWARN("log device %s too small: need %llu bytes", |
| 450 | dev->name, (unsigned long long)buf_size); |
| 451 | kfree(lc); |
| 452 | return -EINVAL; |
| 453 | } |
| 454 | |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 455 | lc->header_location.count = buf_size >> SECTOR_SHIFT; |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 456 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 457 | lc->io_req.mem.type = DM_IO_VMA; |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 458 | lc->io_req.notify.fn = NULL; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 459 | lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, |
| 460 | PAGE_SIZE)); |
| 461 | if (IS_ERR(lc->io_req.client)) { |
| 462 | r = PTR_ERR(lc->io_req.client); |
| 463 | DMWARN("couldn't allocate disk io client"); |
| 464 | kfree(lc); |
| 465 | return -ENOMEM; |
| 466 | } |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 467 | |
| 468 | lc->disk_header = vmalloc(buf_size); |
| 469 | if (!lc->disk_header) { |
| 470 | DMWARN("couldn't allocate disk log buffer"); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 471 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 472 | kfree(lc); |
| 473 | return -ENOMEM; |
| 474 | } |
| 475 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 476 | lc->io_req.mem.ptr.vma = lc->disk_header; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 477 | lc->clean_bits = (void *)lc->disk_header + |
| 478 | (LOG_OFFSET << SECTOR_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | memset(lc->clean_bits, -1, bitset_size); |
| 482 | |
| 483 | lc->sync_bits = vmalloc(bitset_size); |
| 484 | if (!lc->sync_bits) { |
| 485 | DMWARN("couldn't allocate sync bitset"); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 486 | if (!dev) |
| 487 | vfree(lc->clean_bits); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 488 | else |
| 489 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 490 | vfree(lc->disk_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | kfree(lc); |
| 492 | return -ENOMEM; |
| 493 | } |
| 494 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); |
| 495 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; |
| 496 | |
| 497 | lc->recovering_bits = vmalloc(bitset_size); |
| 498 | if (!lc->recovering_bits) { |
| 499 | DMWARN("couldn't allocate sync bitset"); |
| 500 | vfree(lc->sync_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 501 | if (!dev) |
| 502 | vfree(lc->clean_bits); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 503 | else |
| 504 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 505 | vfree(lc->disk_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | kfree(lc); |
| 507 | return -ENOMEM; |
| 508 | } |
| 509 | memset(lc->recovering_bits, 0, bitset_size); |
| 510 | lc->sync_search = 0; |
| 511 | log->context = lc; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | return 0; |
| 514 | } |
| 515 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 516 | static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 517 | unsigned int argc, char **argv) |
| 518 | { |
| 519 | return create_log_context(log, ti, argc, argv, NULL); |
| 520 | } |
| 521 | |
| 522 | static void destroy_log_context(struct log_c *lc) |
| 523 | { |
| 524 | vfree(lc->sync_bits); |
| 525 | vfree(lc->recovering_bits); |
| 526 | kfree(lc); |
| 527 | } |
| 528 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 529 | static void core_dtr(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
| 531 | struct log_c *lc = (struct log_c *) log->context; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | vfree(lc->clean_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 534 | destroy_log_context(lc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | /*---------------------------------------------------------------- |
| 538 | * disk log constructor/destructor |
| 539 | * |
| 540 | * argv contains log_device region_size followed optionally by [no]sync |
| 541 | *--------------------------------------------------------------*/ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 542 | static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | unsigned int argc, char **argv) |
| 544 | { |
| 545 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | struct dm_dev *dev; |
| 547 | |
| 548 | if (argc < 2 || argc > 3) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 549 | DMWARN("wrong number of arguments to disk dirty region log"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return -EINVAL; |
| 551 | } |
| 552 | |
| 553 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, |
| 554 | FMODE_READ | FMODE_WRITE, &dev); |
| 555 | if (r) |
| 556 | return r; |
| 557 | |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 558 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (r) { |
| 560 | dm_put_device(ti, dev); |
| 561 | return r; |
| 562 | } |
| 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 567 | static void disk_dtr(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
| 569 | struct log_c *lc = (struct log_c *) log->context; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | dm_put_device(lc->ti, lc->log_dev); |
| 572 | vfree(lc->disk_header); |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 573 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 574 | destroy_log_context(lc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | static int count_bits32(uint32_t *addr, unsigned size) |
| 578 | { |
| 579 | int count = 0, i; |
| 580 | |
| 581 | for (i = 0; i < size; i++) { |
| 582 | count += hweight32(*(addr+i)); |
| 583 | } |
| 584 | return count; |
| 585 | } |
| 586 | |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 587 | static void fail_log_device(struct log_c *lc) |
| 588 | { |
| 589 | if (lc->log_dev_failed) |
| 590 | return; |
| 591 | |
| 592 | lc->log_dev_failed = 1; |
| 593 | dm_table_event(lc->ti->table); |
| 594 | } |
| 595 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 596 | static int disk_resume(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | { |
| 598 | int r; |
| 599 | unsigned i; |
| 600 | struct log_c *lc = (struct log_c *) log->context; |
| 601 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); |
| 602 | |
| 603 | /* read the disk header */ |
| 604 | r = read_header(lc); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 605 | if (r) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 606 | DMWARN("%s: Failed to read header on dirty region log device", |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 607 | lc->log_dev->name); |
| 608 | fail_log_device(lc); |
Jonathan Brassow | ba8b45c | 2007-05-09 02:33:08 -0700 | [diff] [blame] | 609 | /* |
| 610 | * If the log device cannot be read, we must assume |
| 611 | * all regions are out-of-sync. If we simply return |
| 612 | * here, the state will be uninitialized and could |
| 613 | * lead us to return 'in-sync' status for regions |
| 614 | * that are actually 'out-of-sync'. |
| 615 | */ |
| 616 | lc->header.nr_regions = 0; |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Alasdair G Kergon | 8a835f1 | 2006-06-26 00:27:30 -0700 | [diff] [blame] | 619 | /* set or clear any new bits -- device has grown */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | if (lc->sync == NOSYNC) |
| 621 | for (i = lc->header.nr_regions; i < lc->region_count; i++) |
| 622 | /* FIXME: amazingly inefficient */ |
| 623 | log_set_bit(lc, lc->clean_bits, i); |
| 624 | else |
| 625 | for (i = lc->header.nr_regions; i < lc->region_count; i++) |
| 626 | /* FIXME: amazingly inefficient */ |
| 627 | log_clear_bit(lc, lc->clean_bits, i); |
| 628 | |
Alasdair G Kergon | 8a835f1 | 2006-06-26 00:27:30 -0700 | [diff] [blame] | 629 | /* clear any old bits -- device has shrunk */ |
| 630 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) |
| 631 | log_clear_bit(lc, lc->clean_bits, i); |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* copy clean across to sync */ |
| 634 | memcpy(lc->sync_bits, lc->clean_bits, size); |
| 635 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); |
Jonathan E Brassow | 88b20a1 | 2006-12-08 02:41:12 -0800 | [diff] [blame] | 636 | lc->sync_search = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | /* set the correct number of regions in the header */ |
| 639 | lc->header.nr_regions = lc->region_count; |
| 640 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 641 | header_to_disk(&lc->header, lc->disk_header); |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | /* write the new header */ |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 644 | r = rw_header(lc, WRITE); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 645 | if (r) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 646 | DMWARN("%s: Failed to write header on dirty region log device", |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 647 | lc->log_dev->name); |
| 648 | fail_log_device(lc); |
| 649 | } |
| 650 | |
| 651 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 654 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | struct log_c *lc = (struct log_c *) log->context; |
| 657 | return lc->region_size; |
| 658 | } |
| 659 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 660 | static int core_resume(struct dm_dirty_log *log) |
Jonathan E Brassow | 88b20a1 | 2006-12-08 02:41:12 -0800 | [diff] [blame] | 661 | { |
| 662 | struct log_c *lc = (struct log_c *) log->context; |
| 663 | lc->sync_search = 0; |
| 664 | return 0; |
| 665 | } |
| 666 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 667 | static int core_is_clean(struct dm_dirty_log *log, region_t region) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | { |
| 669 | struct log_c *lc = (struct log_c *) log->context; |
| 670 | return log_test_bit(lc->clean_bits, region); |
| 671 | } |
| 672 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 673 | static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
| 675 | struct log_c *lc = (struct log_c *) log->context; |
| 676 | return log_test_bit(lc->sync_bits, region); |
| 677 | } |
| 678 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 679 | static int core_flush(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
| 681 | /* no op */ |
| 682 | return 0; |
| 683 | } |
| 684 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 685 | static int disk_flush(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | { |
| 687 | int r; |
| 688 | struct log_c *lc = (struct log_c *) log->context; |
| 689 | |
| 690 | /* only write if the log has changed */ |
| 691 | if (!lc->touched) |
| 692 | return 0; |
| 693 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 694 | r = rw_header(lc, WRITE); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 695 | if (r) |
| 696 | fail_log_device(lc); |
| 697 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | lc->touched = 0; |
| 699 | |
| 700 | return r; |
| 701 | } |
| 702 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 703 | static void core_mark_region(struct dm_dirty_log *log, region_t region) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | struct log_c *lc = (struct log_c *) log->context; |
| 706 | log_clear_bit(lc, lc->clean_bits, region); |
| 707 | } |
| 708 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 709 | static void core_clear_region(struct dm_dirty_log *log, region_t region) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
| 711 | struct log_c *lc = (struct log_c *) log->context; |
| 712 | log_set_bit(lc, lc->clean_bits, region); |
| 713 | } |
| 714 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 715 | static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | { |
| 717 | struct log_c *lc = (struct log_c *) log->context; |
| 718 | |
| 719 | if (lc->sync_search >= lc->region_count) |
| 720 | return 0; |
| 721 | |
| 722 | do { |
Stefan Bader | 1113a7e | 2006-02-02 14:28:07 -0800 | [diff] [blame] | 723 | *region = ext2_find_next_zero_bit( |
| 724 | (unsigned long *) lc->sync_bits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | lc->region_count, |
| 726 | lc->sync_search); |
| 727 | lc->sync_search = *region + 1; |
| 728 | |
Darrick J. Wong | ac81b2e | 2006-01-06 00:20:11 -0800 | [diff] [blame] | 729 | if (*region >= lc->region_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | return 0; |
| 731 | |
| 732 | } while (log_test_bit(lc->recovering_bits, *region)); |
| 733 | |
| 734 | log_set_bit(lc, lc->recovering_bits, *region); |
| 735 | return 1; |
| 736 | } |
| 737 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 738 | static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 739 | int in_sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
| 741 | struct log_c *lc = (struct log_c *) log->context; |
| 742 | |
| 743 | log_clear_bit(lc, lc->recovering_bits, region); |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 744 | if (in_sync) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | log_set_bit(lc, lc->sync_bits, region); |
| 746 | lc->sync_count++; |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 747 | } else if (log_test_bit(lc->sync_bits, region)) { |
| 748 | lc->sync_count--; |
| 749 | log_clear_bit(lc, lc->sync_bits, region); |
| 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 753 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | { |
| 755 | struct log_c *lc = (struct log_c *) log->context; |
| 756 | |
| 757 | return lc->sync_count; |
| 758 | } |
| 759 | |
| 760 | #define DMEMIT_SYNC \ |
| 761 | if (lc->sync != DEFAULTSYNC) \ |
| 762 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") |
| 763 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 764 | static int core_status(struct dm_dirty_log *log, status_type_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | char *result, unsigned int maxlen) |
| 766 | { |
| 767 | int sz = 0; |
| 768 | struct log_c *lc = log->context; |
| 769 | |
| 770 | switch(status) { |
| 771 | case STATUSTYPE_INFO: |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 772 | DMEMIT("1 %s", log->type->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | break; |
| 774 | |
| 775 | case STATUSTYPE_TABLE: |
| 776 | DMEMIT("%s %u %u ", log->type->name, |
| 777 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); |
| 778 | DMEMIT_SYNC; |
| 779 | } |
| 780 | |
| 781 | return sz; |
| 782 | } |
| 783 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 784 | static int disk_status(struct dm_dirty_log *log, status_type_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | char *result, unsigned int maxlen) |
| 786 | { |
| 787 | int sz = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | struct log_c *lc = log->context; |
| 789 | |
| 790 | switch(status) { |
| 791 | case STATUSTYPE_INFO: |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 792 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
| 793 | lc->log_dev_failed ? 'D' : 'A'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | break; |
| 795 | |
| 796 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | DMEMIT("%s %u %s %u ", log->type->name, |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 798 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | lc->region_size); |
| 800 | DMEMIT_SYNC; |
| 801 | } |
| 802 | |
| 803 | return sz; |
| 804 | } |
| 805 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 806 | static struct dm_dirty_log_type _core_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | .name = "core", |
| 808 | .module = THIS_MODULE, |
| 809 | .ctr = core_ctr, |
| 810 | .dtr = core_dtr, |
Jonathan E Brassow | 88b20a1 | 2006-12-08 02:41:12 -0800 | [diff] [blame] | 811 | .resume = core_resume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | .get_region_size = core_get_region_size, |
| 813 | .is_clean = core_is_clean, |
| 814 | .in_sync = core_in_sync, |
| 815 | .flush = core_flush, |
| 816 | .mark_region = core_mark_region, |
| 817 | .clear_region = core_clear_region, |
| 818 | .get_resync_work = core_get_resync_work, |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 819 | .set_region_sync = core_set_region_sync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | .get_sync_count = core_get_sync_count, |
| 821 | .status = core_status, |
| 822 | }; |
| 823 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 824 | static struct dm_dirty_log_type _disk_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | .name = "disk", |
| 826 | .module = THIS_MODULE, |
| 827 | .ctr = disk_ctr, |
| 828 | .dtr = disk_dtr, |
Jonathan Brassow | 6b3df0d | 2007-10-19 22:47:57 +0100 | [diff] [blame] | 829 | .postsuspend = disk_flush, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | .resume = disk_resume, |
| 831 | .get_region_size = core_get_region_size, |
| 832 | .is_clean = core_is_clean, |
| 833 | .in_sync = core_in_sync, |
| 834 | .flush = disk_flush, |
| 835 | .mark_region = core_mark_region, |
| 836 | .clear_region = core_clear_region, |
| 837 | .get_resync_work = core_get_resync_work, |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 838 | .set_region_sync = core_set_region_sync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | .get_sync_count = core_get_sync_count, |
| 840 | .status = disk_status, |
| 841 | }; |
| 842 | |
Adrian Bunk | c8da2f8 | 2008-07-21 12:00:27 +0100 | [diff] [blame] | 843 | static int __init dm_dirty_log_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | { |
| 845 | int r; |
| 846 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 847 | r = dm_dirty_log_type_register(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | if (r) |
| 849 | DMWARN("couldn't register core log"); |
| 850 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 851 | r = dm_dirty_log_type_register(&_disk_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | if (r) { |
| 853 | DMWARN("couldn't register disk type"); |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 854 | dm_dirty_log_type_unregister(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | return r; |
| 858 | } |
| 859 | |
Adrian Bunk | c8da2f8 | 2008-07-21 12:00:27 +0100 | [diff] [blame] | 860 | static void __exit dm_dirty_log_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | { |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 862 | dm_dirty_log_type_unregister(&_disk_type); |
| 863 | dm_dirty_log_type_unregister(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | |
Heinz Mauelshagen | 769aef3 | 2008-04-24 21:43:09 +0100 | [diff] [blame] | 866 | module_init(dm_dirty_log_init); |
| 867 | module_exit(dm_dirty_log_exit); |
| 868 | |
| 869 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); |
| 870 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); |
| 871 | MODULE_LICENSE("GPL"); |