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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | static LIST_HEAD(_log_types); |
| 20 | static DEFINE_SPINLOCK(_lock); |
| 21 | |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 22 | static struct dm_dirty_log_type *__find_dirty_log_type(const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | { |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 24 | struct dm_dirty_log_type *log_type; |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 25 | |
| 26 | list_for_each_entry(log_type, &_log_types, list) |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 27 | if (!strcmp(name, log_type->name)) |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 28 | return log_type; |
| 29 | |
| 30 | return NULL; |
| 31 | } |
| 32 | |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 33 | static struct dm_dirty_log_type *_get_dirty_log_type(const char *name) |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 34 | { |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 35 | struct dm_dirty_log_type *log_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | spin_lock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 38 | |
| 39 | log_type = __find_dirty_log_type(name); |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 40 | if (log_type && !try_module_get(log_type->module)) |
Mike Snitzer | 84e67c9 | 2009-04-02 19:55:29 +0100 | [diff] [blame] | 41 | log_type = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | spin_unlock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 44 | |
| 45 | return log_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 48 | /* |
| 49 | * get_type |
| 50 | * @type_name |
| 51 | * |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 52 | * 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] | 53 | * available, attempt to load the appropriate module. |
| 54 | * |
| 55 | * Log modules are named "dm-log-" followed by the 'type_name'. |
| 56 | * Modules may contain multiple types. |
| 57 | * This function will first try the module "dm-log-<type_name>", |
| 58 | * then truncate 'type_name' on the last '-' and try again. |
| 59 | * |
| 60 | * For example, if type_name was "clustered-disk", it would search |
| 61 | * 'dm-log-clustered-disk' then 'dm-log-clustered'. |
| 62 | * |
| 63 | * Returns: dirty_log_type* on success, NULL on failure |
| 64 | */ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 65 | static struct dm_dirty_log_type *get_type(const char *type_name) |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 66 | { |
| 67 | char *p, *type_name_dup; |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 68 | struct dm_dirty_log_type *log_type; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 69 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 70 | if (!type_name) |
| 71 | return NULL; |
| 72 | |
| 73 | log_type = _get_dirty_log_type(type_name); |
| 74 | if (log_type) |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 75 | return log_type; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 76 | |
| 77 | type_name_dup = kstrdup(type_name, GFP_KERNEL); |
| 78 | if (!type_name_dup) { |
| 79 | DMWARN("No memory left to attempt log module load for \"%s\"", |
| 80 | type_name); |
| 81 | return NULL; |
| 82 | } |
| 83 | |
| 84 | while (request_module("dm-log-%s", type_name_dup) || |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 85 | !(log_type = _get_dirty_log_type(type_name))) { |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 86 | p = strrchr(type_name_dup, '-'); |
| 87 | if (!p) |
| 88 | break; |
| 89 | p[0] = '\0'; |
| 90 | } |
| 91 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 92 | if (!log_type) |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 93 | DMWARN("Module for logging type \"%s\" not found.", type_name); |
| 94 | |
| 95 | kfree(type_name_dup); |
| 96 | |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 97 | return log_type; |
Jonathan Brassow | fb8b284 | 2008-02-08 02:11:19 +0000 | [diff] [blame] | 98 | } |
| 99 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 100 | static void put_type(struct dm_dirty_log_type *type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 102 | if (!type) |
| 103 | return; |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | spin_lock(&_lock); |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 106 | if (!__find_dirty_log_type(type->name)) |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 107 | goto out; |
| 108 | |
Mike Snitzer | 84e67c9 | 2009-04-02 19:55:29 +0100 | [diff] [blame] | 109 | module_put(type->module); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 110 | |
| 111 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | spin_unlock(&_lock); |
| 113 | } |
| 114 | |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 115 | int dm_dirty_log_type_register(struct dm_dirty_log_type *type) |
| 116 | { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 117 | int r = 0; |
| 118 | |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 119 | spin_lock(&_lock); |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 120 | if (!__find_dirty_log_type(type->name)) |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 121 | list_add(&type->list, &_log_types); |
| 122 | else |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 123 | r = -EEXIST; |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 124 | spin_unlock(&_lock); |
| 125 | |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 126 | return r; |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 127 | } |
| 128 | EXPORT_SYMBOL(dm_dirty_log_type_register); |
| 129 | |
| 130 | int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) |
| 131 | { |
| 132 | spin_lock(&_lock); |
| 133 | |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 134 | if (!__find_dirty_log_type(type->name)) { |
Jonathan Brassow | 2a23aa1 | 2008-04-24 21:43:41 +0100 | [diff] [blame] | 135 | spin_unlock(&_lock); |
| 136 | return -EINVAL; |
| 137 | } |
| 138 | |
Mike Snitzer | ec44ab9 | 2009-04-02 19:55:30 +0100 | [diff] [blame] | 139 | list_del(&type->list); |
Alasdair G Kergon | b8206bc | 2008-04-24 21:43:38 +0100 | [diff] [blame] | 140 | |
| 141 | spin_unlock(&_lock); |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | EXPORT_SYMBOL(dm_dirty_log_type_unregister); |
| 146 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 147 | struct dm_dirty_log *dm_dirty_log_create(const char *type_name, |
| 148 | struct dm_target *ti, |
| 149 | unsigned int argc, char **argv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 151 | struct dm_dirty_log_type *type; |
| 152 | struct dm_dirty_log *log; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | log = kmalloc(sizeof(*log), GFP_KERNEL); |
| 155 | if (!log) |
| 156 | return NULL; |
| 157 | |
| 158 | type = get_type(type_name); |
| 159 | if (!type) { |
| 160 | kfree(log); |
| 161 | return NULL; |
| 162 | } |
| 163 | |
| 164 | log->type = type; |
| 165 | if (type->ctr(log, ti, argc, argv)) { |
| 166 | kfree(log); |
| 167 | put_type(type); |
| 168 | return NULL; |
| 169 | } |
| 170 | |
| 171 | return log; |
| 172 | } |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 173 | EXPORT_SYMBOL(dm_dirty_log_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 175 | void dm_dirty_log_destroy(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
| 177 | log->type->dtr(log); |
| 178 | put_type(log->type); |
| 179 | kfree(log); |
| 180 | } |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 181 | EXPORT_SYMBOL(dm_dirty_log_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | /*----------------------------------------------------------------- |
| 184 | * Persistent and core logs share a lot of their implementation. |
| 185 | * FIXME: need a reload method to be called from a resume |
| 186 | *---------------------------------------------------------------*/ |
| 187 | /* |
| 188 | * Magic for persistent mirrors: "MiRr" |
| 189 | */ |
| 190 | #define MIRROR_MAGIC 0x4D695272 |
| 191 | |
| 192 | /* |
| 193 | * The on-disk version of the metadata. |
| 194 | */ |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 195 | #define MIRROR_DISK_VERSION 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | #define LOG_OFFSET 2 |
| 197 | |
| 198 | struct log_header { |
| 199 | uint32_t magic; |
| 200 | |
| 201 | /* |
| 202 | * Simple, incrementing version. no backward |
| 203 | * compatibility. |
| 204 | */ |
| 205 | uint32_t version; |
| 206 | sector_t nr_regions; |
| 207 | }; |
| 208 | |
| 209 | struct log_c { |
| 210 | struct dm_target *ti; |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 211 | int touched_dirtied; |
| 212 | int touched_cleaned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | uint32_t region_size; |
| 214 | unsigned int region_count; |
| 215 | region_t sync_count; |
| 216 | |
| 217 | unsigned bitset_uint32_count; |
| 218 | uint32_t *clean_bits; |
| 219 | uint32_t *sync_bits; |
| 220 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ |
| 221 | |
| 222 | int sync_search; |
| 223 | |
| 224 | /* Resync flag */ |
| 225 | enum sync { |
| 226 | DEFAULTSYNC, /* Synchronize if necessary */ |
| 227 | NOSYNC, /* Devices known to be already in sync */ |
| 228 | FORCESYNC, /* Force a sync to happen */ |
| 229 | } sync; |
| 230 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 231 | struct dm_io_request io_req; |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* |
| 234 | * Disk log fields |
| 235 | */ |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 236 | int log_dev_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | struct dm_dev *log_dev; |
| 238 | struct log_header header; |
| 239 | |
Heinz Mauelshagen | 22a1ceb | 2008-04-24 21:43:17 +0100 | [diff] [blame] | 240 | struct dm_io_region header_location; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | struct log_header *disk_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | }; |
| 243 | |
| 244 | /* |
| 245 | * The touched member needs to be updated every time we access |
| 246 | * one of the bitsets. |
| 247 | */ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 248 | static inline int log_test_bit(uint32_t *bs, unsigned bit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 250 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static inline void log_set_bit(struct log_c *l, |
| 254 | uint32_t *bs, unsigned bit) |
| 255 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 256 | ext2_set_bit(bit, (unsigned long *) bs); |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 257 | l->touched_cleaned = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | static inline void log_clear_bit(struct log_c *l, |
| 261 | uint32_t *bs, unsigned bit) |
| 262 | { |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 263 | ext2_clear_bit(bit, (unsigned long *) bs); |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 264 | l->touched_dirtied = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | /*---------------------------------------------------------------- |
| 268 | * Header IO |
| 269 | *--------------------------------------------------------------*/ |
| 270 | static void header_to_disk(struct log_header *core, struct log_header *disk) |
| 271 | { |
| 272 | disk->magic = cpu_to_le32(core->magic); |
| 273 | disk->version = cpu_to_le32(core->version); |
| 274 | disk->nr_regions = cpu_to_le64(core->nr_regions); |
| 275 | } |
| 276 | |
| 277 | static void header_from_disk(struct log_header *core, struct log_header *disk) |
| 278 | { |
| 279 | core->magic = le32_to_cpu(disk->magic); |
| 280 | core->version = le32_to_cpu(disk->version); |
| 281 | core->nr_regions = le64_to_cpu(disk->nr_regions); |
| 282 | } |
| 283 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 284 | static int rw_header(struct log_c *lc, int rw) |
| 285 | { |
| 286 | lc->io_req.bi_rw = rw; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 287 | |
| 288 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); |
| 289 | } |
| 290 | |
Mikulas Patocka | 20a34a8 | 2009-12-10 23:52:00 +0000 | [diff] [blame^] | 291 | static int flush_header(struct log_c *lc) |
| 292 | { |
| 293 | struct dm_io_region null_location = { |
| 294 | .bdev = lc->header_location.bdev, |
| 295 | .sector = 0, |
| 296 | .count = 0, |
| 297 | }; |
| 298 | |
| 299 | lc->io_req.bi_rw = WRITE_BARRIER; |
| 300 | |
| 301 | return dm_io(&lc->io_req, 1, &null_location, NULL); |
| 302 | } |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | static int read_header(struct log_c *log) |
| 305 | { |
| 306 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 308 | r = rw_header(log, READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | if (r) |
| 310 | return r; |
| 311 | |
| 312 | header_from_disk(&log->header, log->disk_header); |
| 313 | |
| 314 | /* New log required? */ |
| 315 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { |
| 316 | log->header.magic = MIRROR_MAGIC; |
| 317 | log->header.version = MIRROR_DISK_VERSION; |
| 318 | log->header.nr_regions = 0; |
| 319 | } |
| 320 | |
Patrick Caulfield | a4fc471 | 2006-02-01 03:04:51 -0800 | [diff] [blame] | 321 | #ifdef __LITTLE_ENDIAN |
| 322 | if (log->header.version == 1) |
| 323 | log->header.version = 2; |
| 324 | #endif |
| 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | if (log->header.version != MIRROR_DISK_VERSION) { |
| 327 | DMWARN("incompatible disk log version"); |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
Milan Broz | 2045e88 | 2009-01-06 03:05:01 +0000 | [diff] [blame] | 334 | static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
| 335 | { |
| 336 | if (region_size < 2 || region_size > ti->len) |
| 337 | return 0; |
| 338 | |
| 339 | if (!is_power_of_2(region_size)) |
| 340 | return 0; |
| 341 | |
| 342 | return 1; |
| 343 | } |
| 344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | /*---------------------------------------------------------------- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | * core log constructor/destructor |
| 347 | * |
| 348 | * argv contains region_size followed optionally by [no]sync |
| 349 | *--------------------------------------------------------------*/ |
| 350 | #define BYTE_SHIFT 3 |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 351 | 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] | 352 | unsigned int argc, char **argv, |
| 353 | struct dm_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
| 355 | enum sync sync = DEFAULTSYNC; |
| 356 | |
| 357 | struct log_c *lc; |
| 358 | uint32_t region_size; |
| 359 | unsigned int region_count; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 360 | size_t bitset_size, buf_size; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 361 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | if (argc < 1 || argc > 2) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 364 | DMWARN("wrong number of arguments to dirty region log"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | return -EINVAL; |
| 366 | } |
| 367 | |
| 368 | if (argc > 1) { |
| 369 | if (!strcmp(argv[1], "sync")) |
| 370 | sync = FORCESYNC; |
| 371 | else if (!strcmp(argv[1], "nosync")) |
| 372 | sync = NOSYNC; |
| 373 | else { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 374 | DMWARN("unrecognised sync argument to " |
| 375 | "dirty region log: %s", argv[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | return -EINVAL; |
| 377 | } |
| 378 | } |
| 379 | |
Milan Broz | 2045e88 | 2009-01-06 03:05:01 +0000 | [diff] [blame] | 380 | if (sscanf(argv[0], "%u", ®ion_size) != 1 || |
| 381 | !_check_region_size(ti, region_size)) { |
| 382 | DMWARN("invalid region size %s", argv[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | return -EINVAL; |
| 384 | } |
| 385 | |
| 386 | region_count = dm_sector_div_up(ti->len, region_size); |
| 387 | |
| 388 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); |
| 389 | if (!lc) { |
| 390 | DMWARN("couldn't allocate core log"); |
| 391 | return -ENOMEM; |
| 392 | } |
| 393 | |
| 394 | lc->ti = ti; |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 395 | lc->touched_dirtied = 0; |
| 396 | lc->touched_cleaned = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | lc->region_size = region_size; |
| 398 | lc->region_count = region_count; |
| 399 | lc->sync = sync; |
| 400 | |
| 401 | /* |
Alasdair G Kergon | 0e56822 | 2005-11-21 21:32:34 -0800 | [diff] [blame] | 402 | * 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] | 403 | */ |
| 404 | bitset_size = dm_round_up(region_count, |
Alasdair G Kergon | 29121bd | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 405 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | bitset_size >>= BYTE_SHIFT; |
| 407 | |
Alasdair G Kergon | 29121bd | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 408 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 409 | |
| 410 | /* |
| 411 | * Disk log? |
| 412 | */ |
| 413 | if (!dev) { |
| 414 | lc->clean_bits = vmalloc(bitset_size); |
| 415 | if (!lc->clean_bits) { |
| 416 | DMWARN("couldn't allocate clean bitset"); |
| 417 | kfree(lc); |
| 418 | return -ENOMEM; |
| 419 | } |
| 420 | lc->disk_header = NULL; |
| 421 | } else { |
| 422 | lc->log_dev = dev; |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 423 | lc->log_dev_failed = 0; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 424 | lc->header_location.bdev = lc->log_dev->bdev; |
| 425 | lc->header_location.sector = 0; |
| 426 | |
| 427 | /* |
| 428 | * Buffer holds both header and bitset. |
| 429 | */ |
Mike Snitzer | 18d8594 | 2009-06-22 10:12:33 +0100 | [diff] [blame] | 430 | buf_size = |
| 431 | dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, |
| 432 | bdev_logical_block_size(lc->header_location. |
| 433 | bdev)); |
Milan Broz | ac1f0ac | 2009-01-06 03:05:02 +0000 | [diff] [blame] | 434 | |
Mikulas Patocka | 5657e8f | 2009-06-22 10:12:14 +0100 | [diff] [blame] | 435 | if (buf_size > i_size_read(dev->bdev->bd_inode)) { |
Milan Broz | ac1f0ac | 2009-01-06 03:05:02 +0000 | [diff] [blame] | 436 | DMWARN("log device %s too small: need %llu bytes", |
| 437 | dev->name, (unsigned long long)buf_size); |
| 438 | kfree(lc); |
| 439 | return -EINVAL; |
| 440 | } |
| 441 | |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 442 | lc->header_location.count = buf_size >> SECTOR_SHIFT; |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 443 | |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 444 | lc->io_req.mem.type = DM_IO_VMA; |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 445 | lc->io_req.notify.fn = NULL; |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 446 | lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, |
| 447 | PAGE_SIZE)); |
| 448 | if (IS_ERR(lc->io_req.client)) { |
| 449 | r = PTR_ERR(lc->io_req.client); |
| 450 | DMWARN("couldn't allocate disk io client"); |
| 451 | kfree(lc); |
| 452 | return -ENOMEM; |
| 453 | } |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 454 | |
| 455 | lc->disk_header = vmalloc(buf_size); |
| 456 | if (!lc->disk_header) { |
| 457 | DMWARN("couldn't allocate disk log buffer"); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 458 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 459 | kfree(lc); |
| 460 | return -ENOMEM; |
| 461 | } |
| 462 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 463 | lc->io_req.mem.ptr.vma = lc->disk_header; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 464 | lc->clean_bits = (void *)lc->disk_header + |
| 465 | (LOG_OFFSET << SECTOR_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | memset(lc->clean_bits, -1, bitset_size); |
| 469 | |
| 470 | lc->sync_bits = vmalloc(bitset_size); |
| 471 | if (!lc->sync_bits) { |
| 472 | DMWARN("couldn't allocate sync bitset"); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 473 | if (!dev) |
| 474 | vfree(lc->clean_bits); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 475 | else |
| 476 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 477 | vfree(lc->disk_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | kfree(lc); |
| 479 | return -ENOMEM; |
| 480 | } |
| 481 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); |
| 482 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; |
| 483 | |
| 484 | lc->recovering_bits = vmalloc(bitset_size); |
| 485 | if (!lc->recovering_bits) { |
| 486 | DMWARN("couldn't allocate sync bitset"); |
| 487 | vfree(lc->sync_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 488 | if (!dev) |
| 489 | vfree(lc->clean_bits); |
Takahiro Yasui | c7a2bd1 | 2009-01-06 03:04:56 +0000 | [diff] [blame] | 490 | else |
| 491 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 492 | vfree(lc->disk_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | kfree(lc); |
| 494 | return -ENOMEM; |
| 495 | } |
| 496 | memset(lc->recovering_bits, 0, bitset_size); |
| 497 | lc->sync_search = 0; |
| 498 | log->context = lc; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | return 0; |
| 501 | } |
| 502 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 503 | 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] | 504 | unsigned int argc, char **argv) |
| 505 | { |
| 506 | return create_log_context(log, ti, argc, argv, NULL); |
| 507 | } |
| 508 | |
| 509 | static void destroy_log_context(struct log_c *lc) |
| 510 | { |
| 511 | vfree(lc->sync_bits); |
| 512 | vfree(lc->recovering_bits); |
| 513 | kfree(lc); |
| 514 | } |
| 515 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 516 | static void core_dtr(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | { |
| 518 | struct log_c *lc = (struct log_c *) log->context; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | vfree(lc->clean_bits); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 521 | destroy_log_context(lc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /*---------------------------------------------------------------- |
| 525 | * disk log constructor/destructor |
| 526 | * |
| 527 | * argv contains log_device region_size followed optionally by [no]sync |
| 528 | *--------------------------------------------------------------*/ |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 529 | 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] | 530 | unsigned int argc, char **argv) |
| 531 | { |
| 532 | int r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | struct dm_dev *dev; |
| 534 | |
| 535 | if (argc < 2 || argc > 3) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 536 | DMWARN("wrong number of arguments to disk dirty region log"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | return -EINVAL; |
| 538 | } |
| 539 | |
| 540 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, |
| 541 | FMODE_READ | FMODE_WRITE, &dev); |
| 542 | if (r) |
| 543 | return r; |
| 544 | |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 545 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | if (r) { |
| 547 | dm_put_device(ti, dev); |
| 548 | return r; |
| 549 | } |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
| 553 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 554 | static void disk_dtr(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
| 556 | struct log_c *lc = (struct log_c *) log->context; |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | dm_put_device(lc->ti, lc->log_dev); |
| 559 | vfree(lc->disk_header); |
Heinz Mauelshagen | 5d234d1 | 2007-05-09 02:33:03 -0700 | [diff] [blame] | 560 | dm_io_client_destroy(lc->io_req.client); |
Alasdair G Kergon | b7cca19 | 2006-06-26 00:27:29 -0700 | [diff] [blame] | 561 | destroy_log_context(lc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | } |
| 563 | |
| 564 | static int count_bits32(uint32_t *addr, unsigned size) |
| 565 | { |
| 566 | int count = 0, i; |
| 567 | |
| 568 | for (i = 0; i < size; i++) { |
| 569 | count += hweight32(*(addr+i)); |
| 570 | } |
| 571 | return count; |
| 572 | } |
| 573 | |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 574 | static void fail_log_device(struct log_c *lc) |
| 575 | { |
| 576 | if (lc->log_dev_failed) |
| 577 | return; |
| 578 | |
| 579 | lc->log_dev_failed = 1; |
| 580 | dm_table_event(lc->ti->table); |
| 581 | } |
| 582 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 583 | static int disk_resume(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | { |
| 585 | int r; |
| 586 | unsigned i; |
| 587 | struct log_c *lc = (struct log_c *) log->context; |
| 588 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); |
| 589 | |
| 590 | /* read the disk header */ |
| 591 | r = read_header(lc); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 592 | if (r) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 593 | DMWARN("%s: Failed to read header on dirty region log device", |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 594 | lc->log_dev->name); |
| 595 | fail_log_device(lc); |
Jonathan Brassow | ba8b45c | 2007-05-09 02:33:08 -0700 | [diff] [blame] | 596 | /* |
| 597 | * If the log device cannot be read, we must assume |
| 598 | * all regions are out-of-sync. If we simply return |
| 599 | * here, the state will be uninitialized and could |
| 600 | * lead us to return 'in-sync' status for regions |
| 601 | * that are actually 'out-of-sync'. |
| 602 | */ |
| 603 | lc->header.nr_regions = 0; |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 604 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Alasdair G Kergon | 8a835f1 | 2006-06-26 00:27:30 -0700 | [diff] [blame] | 606 | /* set or clear any new bits -- device has grown */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | if (lc->sync == NOSYNC) |
| 608 | for (i = lc->header.nr_regions; i < lc->region_count; i++) |
| 609 | /* FIXME: amazingly inefficient */ |
| 610 | log_set_bit(lc, lc->clean_bits, i); |
| 611 | else |
| 612 | for (i = lc->header.nr_regions; i < lc->region_count; i++) |
| 613 | /* FIXME: amazingly inefficient */ |
| 614 | log_clear_bit(lc, lc->clean_bits, i); |
| 615 | |
Alasdair G Kergon | 8a835f1 | 2006-06-26 00:27:30 -0700 | [diff] [blame] | 616 | /* clear any old bits -- device has shrunk */ |
| 617 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) |
| 618 | log_clear_bit(lc, lc->clean_bits, i); |
| 619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | /* copy clean across to sync */ |
| 621 | memcpy(lc->sync_bits, lc->clean_bits, size); |
| 622 | 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] | 623 | lc->sync_search = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | /* set the correct number of regions in the header */ |
| 626 | lc->header.nr_regions = lc->region_count; |
| 627 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 628 | header_to_disk(&lc->header, lc->disk_header); |
| 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* write the new header */ |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 631 | r = rw_header(lc, WRITE); |
Mikulas Patocka | 20a34a8 | 2009-12-10 23:52:00 +0000 | [diff] [blame^] | 632 | if (!r) |
| 633 | r = flush_header(lc); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 634 | if (r) { |
Heinz Mauelshagen | b7fd54a | 2008-04-24 21:43:06 +0100 | [diff] [blame] | 635 | DMWARN("%s: Failed to write header on dirty region log device", |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 636 | lc->log_dev->name); |
| 637 | fail_log_device(lc); |
| 638 | } |
| 639 | |
| 640 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } |
| 642 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 643 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | { |
| 645 | struct log_c *lc = (struct log_c *) log->context; |
| 646 | return lc->region_size; |
| 647 | } |
| 648 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 649 | static int core_resume(struct dm_dirty_log *log) |
Jonathan E Brassow | 88b20a1 | 2006-12-08 02:41:12 -0800 | [diff] [blame] | 650 | { |
| 651 | struct log_c *lc = (struct log_c *) log->context; |
| 652 | lc->sync_search = 0; |
| 653 | return 0; |
| 654 | } |
| 655 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 656 | 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] | 657 | { |
| 658 | struct log_c *lc = (struct log_c *) log->context; |
| 659 | return log_test_bit(lc->clean_bits, region); |
| 660 | } |
| 661 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 662 | 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] | 663 | { |
| 664 | struct log_c *lc = (struct log_c *) log->context; |
| 665 | return log_test_bit(lc->sync_bits, region); |
| 666 | } |
| 667 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 668 | static int core_flush(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
| 670 | /* no op */ |
| 671 | return 0; |
| 672 | } |
| 673 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 674 | static int disk_flush(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
| 676 | int r; |
| 677 | struct log_c *lc = (struct log_c *) log->context; |
| 678 | |
| 679 | /* only write if the log has changed */ |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 680 | if (!lc->touched_cleaned && !lc->touched_dirtied) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | return 0; |
| 682 | |
Takahiro Yasui | 6f3af01 | 2009-01-06 03:04:59 +0000 | [diff] [blame] | 683 | r = rw_header(lc, WRITE); |
Jonathan E Brassow | 01d03a6 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 684 | if (r) |
| 685 | fail_log_device(lc); |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 686 | else { |
Mikulas Patocka | 20a34a8 | 2009-12-10 23:52:00 +0000 | [diff] [blame^] | 687 | if (lc->touched_dirtied) { |
| 688 | r = flush_header(lc); |
| 689 | if (r) |
| 690 | fail_log_device(lc); |
| 691 | else |
| 692 | lc->touched_dirtied = 0; |
| 693 | } |
Mikulas Patocka | b09acf1 | 2009-12-10 23:51:59 +0000 | [diff] [blame] | 694 | lc->touched_cleaned = 0; |
| 695 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
| 697 | return r; |
| 698 | } |
| 699 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 700 | 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] | 701 | { |
| 702 | struct log_c *lc = (struct log_c *) log->context; |
| 703 | log_clear_bit(lc, lc->clean_bits, region); |
| 704 | } |
| 705 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 706 | 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] | 707 | { |
| 708 | struct log_c *lc = (struct log_c *) log->context; |
| 709 | log_set_bit(lc, lc->clean_bits, region); |
| 710 | } |
| 711 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 712 | 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] | 713 | { |
| 714 | struct log_c *lc = (struct log_c *) log->context; |
| 715 | |
| 716 | if (lc->sync_search >= lc->region_count) |
| 717 | return 0; |
| 718 | |
| 719 | do { |
Stefan Bader | 1113a7e | 2006-02-02 14:28:07 -0800 | [diff] [blame] | 720 | *region = ext2_find_next_zero_bit( |
| 721 | (unsigned long *) lc->sync_bits, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | lc->region_count, |
| 723 | lc->sync_search); |
| 724 | lc->sync_search = *region + 1; |
| 725 | |
Darrick J. Wong | ac81b2e | 2006-01-06 00:20:11 -0800 | [diff] [blame] | 726 | if (*region >= lc->region_count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | return 0; |
| 728 | |
| 729 | } while (log_test_bit(lc->recovering_bits, *region)); |
| 730 | |
| 731 | log_set_bit(lc, lc->recovering_bits, *region); |
| 732 | return 1; |
| 733 | } |
| 734 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 735 | 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] | 736 | int in_sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | { |
| 738 | struct log_c *lc = (struct log_c *) log->context; |
| 739 | |
| 740 | log_clear_bit(lc, lc->recovering_bits, region); |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 741 | if (in_sync) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | log_set_bit(lc, lc->sync_bits, region); |
| 743 | lc->sync_count++; |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 744 | } else if (log_test_bit(lc->sync_bits, region)) { |
| 745 | lc->sync_count--; |
| 746 | log_clear_bit(lc, lc->sync_bits, region); |
| 747 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 750 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | { |
| 752 | struct log_c *lc = (struct log_c *) log->context; |
| 753 | |
| 754 | return lc->sync_count; |
| 755 | } |
| 756 | |
| 757 | #define DMEMIT_SYNC \ |
| 758 | if (lc->sync != DEFAULTSYNC) \ |
| 759 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") |
| 760 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 761 | 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] | 762 | char *result, unsigned int maxlen) |
| 763 | { |
| 764 | int sz = 0; |
| 765 | struct log_c *lc = log->context; |
| 766 | |
| 767 | switch(status) { |
| 768 | case STATUSTYPE_INFO: |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 769 | DMEMIT("1 %s", log->type->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | break; |
| 771 | |
| 772 | case STATUSTYPE_TABLE: |
| 773 | DMEMIT("%s %u %u ", log->type->name, |
| 774 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); |
| 775 | DMEMIT_SYNC; |
| 776 | } |
| 777 | |
| 778 | return sz; |
| 779 | } |
| 780 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 781 | 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] | 782 | char *result, unsigned int maxlen) |
| 783 | { |
| 784 | int sz = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | struct log_c *lc = log->context; |
| 786 | |
| 787 | switch(status) { |
| 788 | case STATUSTYPE_INFO: |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 789 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
| 790 | lc->log_dev_failed ? 'D' : 'A'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | break; |
| 792 | |
| 793 | case STATUSTYPE_TABLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | DMEMIT("%s %u %s %u ", log->type->name, |
Jonathan E Brassow | 315dcc2 | 2007-05-09 02:32:58 -0700 | [diff] [blame] | 795 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | lc->region_size); |
| 797 | DMEMIT_SYNC; |
| 798 | } |
| 799 | |
| 800 | return sz; |
| 801 | } |
| 802 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 803 | static struct dm_dirty_log_type _core_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | .name = "core", |
| 805 | .module = THIS_MODULE, |
| 806 | .ctr = core_ctr, |
| 807 | .dtr = core_dtr, |
Jonathan E Brassow | 88b20a1 | 2006-12-08 02:41:12 -0800 | [diff] [blame] | 808 | .resume = core_resume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | .get_region_size = core_get_region_size, |
| 810 | .is_clean = core_is_clean, |
| 811 | .in_sync = core_in_sync, |
| 812 | .flush = core_flush, |
| 813 | .mark_region = core_mark_region, |
| 814 | .clear_region = core_clear_region, |
| 815 | .get_resync_work = core_get_resync_work, |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 816 | .set_region_sync = core_set_region_sync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | .get_sync_count = core_get_sync_count, |
| 818 | .status = core_status, |
| 819 | }; |
| 820 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 821 | static struct dm_dirty_log_type _disk_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | .name = "disk", |
| 823 | .module = THIS_MODULE, |
| 824 | .ctr = disk_ctr, |
| 825 | .dtr = disk_dtr, |
Jonathan Brassow | 6b3df0d | 2007-10-19 22:47:57 +0100 | [diff] [blame] | 826 | .postsuspend = disk_flush, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | .resume = disk_resume, |
| 828 | .get_region_size = core_get_region_size, |
| 829 | .is_clean = core_is_clean, |
| 830 | .in_sync = core_in_sync, |
| 831 | .flush = disk_flush, |
| 832 | .mark_region = core_mark_region, |
| 833 | .clear_region = core_clear_region, |
| 834 | .get_resync_work = core_get_resync_work, |
Jonathan E Brassow | f3ee6b2 | 2006-12-08 02:41:11 -0800 | [diff] [blame] | 835 | .set_region_sync = core_set_region_sync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | .get_sync_count = core_get_sync_count, |
| 837 | .status = disk_status, |
| 838 | }; |
| 839 | |
Adrian Bunk | c8da2f8 | 2008-07-21 12:00:27 +0100 | [diff] [blame] | 840 | static int __init dm_dirty_log_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | { |
| 842 | int r; |
| 843 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 844 | r = dm_dirty_log_type_register(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | if (r) |
| 846 | DMWARN("couldn't register core log"); |
| 847 | |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 848 | r = dm_dirty_log_type_register(&_disk_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | if (r) { |
| 850 | DMWARN("couldn't register disk type"); |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 851 | dm_dirty_log_type_unregister(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | return r; |
| 855 | } |
| 856 | |
Adrian Bunk | c8da2f8 | 2008-07-21 12:00:27 +0100 | [diff] [blame] | 857 | static void __exit dm_dirty_log_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
Heinz Mauelshagen | 416cd17 | 2008-04-24 21:43:35 +0100 | [diff] [blame] | 859 | dm_dirty_log_type_unregister(&_disk_type); |
| 860 | dm_dirty_log_type_unregister(&_core_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | |
Heinz Mauelshagen | 769aef3 | 2008-04-24 21:43:09 +0100 | [diff] [blame] | 863 | module_init(dm_dirty_log_init); |
| 864 | module_exit(dm_dirty_log_exit); |
| 865 | |
| 866 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); |
| 867 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); |
| 868 | MODULE_LICENSE("GPL"); |