Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2001 Sistina Software (UK) Limited. |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [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 GPL. |
| 6 | */ |
| 7 | |
| 8 | #include "dm.h" |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/vmalloc.h> |
| 12 | #include <linux/blkdev.h> |
| 13 | #include <linux/namei.h> |
| 14 | #include <linux/ctype.h> |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 15 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/slab.h> |
| 17 | #include <linux/interrupt.h> |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 18 | #include <linux/mutex.h> |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 19 | #include <linux/delay.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 20 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 22 | #define DM_MSG_PREFIX "table" |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #define MAX_DEPTH 16 |
| 25 | #define NODE_SIZE L1_CACHE_BYTES |
| 26 | #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t)) |
| 27 | #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1) |
| 28 | |
| 29 | struct dm_table { |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 30 | struct mapped_device *md; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 31 | unsigned type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | /* btree table */ |
| 34 | unsigned int depth; |
| 35 | unsigned int counts[MAX_DEPTH]; /* in nodes */ |
| 36 | sector_t *index[MAX_DEPTH]; |
| 37 | |
| 38 | unsigned int num_targets; |
| 39 | unsigned int num_allocated; |
| 40 | sector_t *highs; |
| 41 | struct dm_target *targets; |
| 42 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 43 | struct target_type *immutable_target_type; |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 44 | unsigned integrity_supported:1; |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 45 | unsigned singleton:1; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | /* |
| 48 | * Indicates the rw permissions for the new logical |
| 49 | * device. This should be a combination of FMODE_READ |
| 50 | * and FMODE_WRITE. |
| 51 | */ |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 52 | fmode_t mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* a list of devices used by this table */ |
| 55 | struct list_head devices; |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /* events get handed up using this callback */ |
| 58 | void (*event_fn)(void *); |
| 59 | void *event_context; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 60 | |
| 61 | struct dm_md_mempools *mempools; |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 62 | |
| 63 | struct list_head target_callbacks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | /* |
| 67 | * Similar to ceiling(log_size(n)) |
| 68 | */ |
| 69 | static unsigned int int_log(unsigned int n, unsigned int base) |
| 70 | { |
| 71 | int result = 0; |
| 72 | |
| 73 | while (n > 1) { |
| 74 | n = dm_div_up(n, base); |
| 75 | result++; |
| 76 | } |
| 77 | |
| 78 | return result; |
| 79 | } |
| 80 | |
| 81 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | * Calculate the index of the child node of the n'th node k'th key. |
| 83 | */ |
| 84 | static inline unsigned int get_child(unsigned int n, unsigned int k) |
| 85 | { |
| 86 | return (n * CHILDREN_PER_NODE) + k; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Return the n'th node of level l from table t. |
| 91 | */ |
| 92 | static inline sector_t *get_node(struct dm_table *t, |
| 93 | unsigned int l, unsigned int n) |
| 94 | { |
| 95 | return t->index[l] + (n * KEYS_PER_NODE); |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Return the highest key that you could lookup from the n'th |
| 100 | * node on level l of the btree. |
| 101 | */ |
| 102 | static sector_t high(struct dm_table *t, unsigned int l, unsigned int n) |
| 103 | { |
| 104 | for (; l < t->depth - 1; l++) |
| 105 | n = get_child(n, CHILDREN_PER_NODE - 1); |
| 106 | |
| 107 | if (n >= t->counts[l]) |
| 108 | return (sector_t) - 1; |
| 109 | |
| 110 | return get_node(t, l, n)[KEYS_PER_NODE - 1]; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Fills in a level of the btree based on the highs of the level |
| 115 | * below it. |
| 116 | */ |
| 117 | static int setup_btree_index(unsigned int l, struct dm_table *t) |
| 118 | { |
| 119 | unsigned int n, k; |
| 120 | sector_t *node; |
| 121 | |
| 122 | for (n = 0U; n < t->counts[l]; n++) { |
| 123 | node = get_node(t, l, n); |
| 124 | |
| 125 | for (k = 0U; k < KEYS_PER_NODE; k++) |
| 126 | node[k] = high(t, l + 1, get_child(n, k)); |
| 127 | } |
| 128 | |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size) |
| 133 | { |
| 134 | unsigned long size; |
| 135 | void *addr; |
| 136 | |
| 137 | /* |
| 138 | * Check that we're not going to overflow. |
| 139 | */ |
| 140 | if (nmemb > (ULONG_MAX / elem_size)) |
| 141 | return NULL; |
| 142 | |
| 143 | size = nmemb * elem_size; |
Joe Perches | e29e65a | 2011-08-02 12:32:02 +0100 | [diff] [blame] | 144 | addr = vzalloc(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | return addr; |
| 147 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 148 | EXPORT_SYMBOL(dm_vcalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | /* |
| 151 | * highs, and targets are managed as dynamic arrays during a |
| 152 | * table load. |
| 153 | */ |
| 154 | static int alloc_targets(struct dm_table *t, unsigned int num) |
| 155 | { |
| 156 | sector_t *n_highs; |
| 157 | struct dm_target *n_targets; |
| 158 | int n = t->num_targets; |
| 159 | |
| 160 | /* |
| 161 | * Allocate both the target array and offset array at once. |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 162 | * Append an empty entry to catch sectors beyond the end of |
| 163 | * the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | */ |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 165 | n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | sizeof(sector_t)); |
| 167 | if (!n_highs) |
| 168 | return -ENOMEM; |
| 169 | |
| 170 | n_targets = (struct dm_target *) (n_highs + num); |
| 171 | |
| 172 | if (n) { |
| 173 | memcpy(n_highs, t->highs, sizeof(*n_highs) * n); |
| 174 | memcpy(n_targets, t->targets, sizeof(*n_targets) * n); |
| 175 | } |
| 176 | |
| 177 | memset(n_highs + n, -1, sizeof(*n_highs) * (num - n)); |
| 178 | vfree(t->highs); |
| 179 | |
| 180 | t->num_allocated = num; |
| 181 | t->highs = n_highs; |
| 182 | t->targets = n_targets; |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 187 | int dm_table_create(struct dm_table **result, fmode_t mode, |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 188 | unsigned num_targets, struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | { |
Dmitry Monakhov | 094262d | 2007-10-19 22:38:51 +0100 | [diff] [blame] | 190 | struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | if (!t) |
| 193 | return -ENOMEM; |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | INIT_LIST_HEAD(&t->devices); |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 196 | INIT_LIST_HEAD(&t->target_callbacks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | if (!num_targets) |
| 199 | num_targets = KEYS_PER_NODE; |
| 200 | |
| 201 | num_targets = dm_round_up(num_targets, KEYS_PER_NODE); |
| 202 | |
| 203 | if (alloc_targets(t, num_targets)) { |
| 204 | kfree(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | return -ENOMEM; |
| 206 | } |
| 207 | |
| 208 | t->mode = mode; |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 209 | t->md = md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | *result = t; |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static void free_devices(struct list_head *devices) |
| 215 | { |
| 216 | struct list_head *tmp, *next; |
| 217 | |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 218 | list_for_each_safe(tmp, next, devices) { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 219 | struct dm_dev_internal *dd = |
| 220 | list_entry(tmp, struct dm_dev_internal, list); |
Jonthan Brassow | 1b6da75 | 2009-06-22 10:12:29 +0100 | [diff] [blame] | 221 | DMWARN("dm_table_destroy: dm_put_device call missing for %s", |
| 222 | dd->dm_dev.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | kfree(dd); |
| 224 | } |
| 225 | } |
| 226 | |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 227 | void dm_table_destroy(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | unsigned int i; |
| 230 | |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 231 | if (!t) |
| 232 | return; |
| 233 | |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 234 | /* free the indexes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | if (t->depth >= 2) |
| 236 | vfree(t->index[t->depth - 2]); |
| 237 | |
| 238 | /* free the targets */ |
| 239 | for (i = 0; i < t->num_targets; i++) { |
| 240 | struct dm_target *tgt = t->targets + i; |
| 241 | |
| 242 | if (tgt->type->dtr) |
| 243 | tgt->type->dtr(tgt); |
| 244 | |
| 245 | dm_put_target_type(tgt->type); |
| 246 | } |
| 247 | |
| 248 | vfree(t->highs); |
| 249 | |
| 250 | /* free the device list */ |
Hannes Reinecke | 574ce07 | 2012-03-28 18:41:24 +0100 | [diff] [blame] | 251 | free_devices(&t->devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 253 | dm_free_md_mempools(t->mempools); |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | kfree(t); |
| 256 | } |
| 257 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | /* |
| 259 | * Checks to see if we need to extend highs or targets. |
| 260 | */ |
| 261 | static inline int check_space(struct dm_table *t) |
| 262 | { |
| 263 | if (t->num_targets >= t->num_allocated) |
| 264 | return alloc_targets(t, t->num_allocated * 2); |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | * See if we've already got a device in the list. |
| 271 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 272 | static struct dm_dev_internal *find_device(struct list_head *l, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 274 | struct dm_dev_internal *dd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | list_for_each_entry (dd, l, list) |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 277 | if (dd->dm_dev.bdev->bd_dev == dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return dd; |
| 279 | |
| 280 | return NULL; |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Open a device so we can use it as a map destination. |
| 285 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 286 | static int open_dev(struct dm_dev_internal *d, dev_t dev, |
| 287 | struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | static char *_claim_ptr = "I belong to device-mapper"; |
| 290 | struct block_device *bdev; |
| 291 | |
| 292 | int r; |
| 293 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 294 | BUG_ON(d->dm_dev.bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 296 | bdev = blkdev_get_by_dev(dev, d->dm_dev.mode | FMODE_EXCL, _claim_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (IS_ERR(bdev)) |
| 298 | return PTR_ERR(bdev); |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 299 | |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 300 | r = bd_link_disk_holder(bdev, dm_disk(md)); |
| 301 | if (r) { |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 302 | blkdev_put(bdev, d->dm_dev.mode | FMODE_EXCL); |
Tejun Heo | e09b457 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 303 | return r; |
| 304 | } |
| 305 | |
| 306 | d->dm_dev.bdev = bdev; |
| 307 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Close a device that we've been using. |
| 312 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 313 | static void close_dev(struct dm_dev_internal *d, struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 315 | if (!d->dm_dev.bdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | return; |
| 317 | |
Tejun Heo | 49731ba | 2011-01-14 18:43:57 +0100 | [diff] [blame] | 318 | bd_unlink_disk_holder(d->dm_dev.bdev, dm_disk(md)); |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 319 | blkdev_put(d->dm_dev.bdev, d->dm_dev.mode | FMODE_EXCL); |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 320 | d->dm_dev.bdev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | /* |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 324 | * If possible, this checks an area of a destination device is invalid. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | */ |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 326 | static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev, |
| 327 | sector_t start, sector_t len, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Milan Broz | f4808ca | 2011-05-29 13:02:52 +0100 | [diff] [blame] | 329 | struct request_queue *q; |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 330 | struct queue_limits *limits = data; |
| 331 | struct block_device *bdev = dev->bdev; |
| 332 | sector_t dev_size = |
| 333 | i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 334 | unsigned short logical_block_size_sectors = |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 335 | limits->logical_block_size >> SECTOR_SHIFT; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 336 | char b[BDEVNAME_SIZE]; |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 337 | |
Milan Broz | f4808ca | 2011-05-29 13:02:52 +0100 | [diff] [blame] | 338 | /* |
| 339 | * Some devices exist without request functions, |
| 340 | * such as loop devices not yet bound to backing files. |
| 341 | * Forbid the use of such devices. |
| 342 | */ |
| 343 | q = bdev_get_queue(bdev); |
| 344 | if (!q || !q->make_request_fn) { |
| 345 | DMWARN("%s: %s is not yet initialised: " |
| 346 | "start=%llu, len=%llu, dev_size=%llu", |
| 347 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 348 | (unsigned long long)start, |
| 349 | (unsigned long long)len, |
| 350 | (unsigned long long)dev_size); |
| 351 | return 1; |
| 352 | } |
| 353 | |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 354 | if (!dev_size) |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 355 | return 0; |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 356 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 357 | if ((start >= dev_size) || (start + len > dev_size)) { |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 358 | DMWARN("%s: %s too small for target: " |
| 359 | "start=%llu, len=%llu, dev_size=%llu", |
| 360 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 361 | (unsigned long long)start, |
| 362 | (unsigned long long)len, |
| 363 | (unsigned long long)dev_size); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 364 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | if (logical_block_size_sectors <= 1) |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 368 | return 0; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 369 | |
| 370 | if (start & (logical_block_size_sectors - 1)) { |
| 371 | DMWARN("%s: start=%llu not aligned to h/w " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 372 | "logical block size %u of %s", |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 373 | dm_device_name(ti->table->md), |
| 374 | (unsigned long long)start, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 375 | limits->logical_block_size, bdevname(bdev, b)); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 376 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 377 | } |
| 378 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 379 | if (len & (logical_block_size_sectors - 1)) { |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 380 | DMWARN("%s: len=%llu not aligned to h/w " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 381 | "logical block size %u of %s", |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 382 | dm_device_name(ti->table->md), |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 383 | (unsigned long long)len, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 384 | limits->logical_block_size, bdevname(bdev, b)); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 385 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 386 | } |
| 387 | |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 388 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | /* |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 392 | * This upgrades the mode on an already open dm_dev, being |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | * careful to leave things as they were if we fail to reopen the |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 394 | * device and not to touch the existing bdev field in case |
| 395 | * it is accessed concurrently inside dm_table_any_congested(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | */ |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 397 | static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode, |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 398 | struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
| 400 | int r; |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 401 | struct dm_dev_internal dd_new, dd_old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 403 | dd_new = dd_old = *dd; |
| 404 | |
| 405 | dd_new.dm_dev.mode |= new_mode; |
| 406 | dd_new.dm_dev.bdev = NULL; |
| 407 | |
| 408 | r = open_dev(&dd_new, dd->dm_dev.bdev->bd_dev, md); |
| 409 | if (r) |
| 410 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 412 | dd->dm_dev.mode |= new_mode; |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 413 | close_dev(&dd_old, md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 415 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Add a device to the list, or just increment the usage count if |
| 420 | * it's already present. |
| 421 | */ |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 422 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
| 423 | struct dm_dev **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
| 425 | int r; |
Andrew Morton | 69a2ce7 | 2008-02-08 02:10:14 +0000 | [diff] [blame] | 426 | dev_t uninitialized_var(dev); |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 427 | struct dm_dev_internal *dd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | unsigned int major, minor; |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 429 | struct dm_table *t = ti->table; |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 430 | char dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Eric Sesterhenn | 547bc92 | 2006-03-26 18:22:50 +0200 | [diff] [blame] | 432 | BUG_ON(!t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 434 | if (sscanf(path, "%u:%u%c", &major, &minor, &dummy) == 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | /* Extract the major/minor numbers */ |
| 436 | dev = MKDEV(major, minor); |
| 437 | if (MAJOR(dev) != major || MINOR(dev) != minor) |
| 438 | return -EOVERFLOW; |
| 439 | } else { |
| 440 | /* convert the path to a device */ |
Christoph Hellwig | 72e8264 | 2008-08-11 00:24:08 +0200 | [diff] [blame] | 441 | struct block_device *bdev = lookup_bdev(path); |
| 442 | |
| 443 | if (IS_ERR(bdev)) |
| 444 | return PTR_ERR(bdev); |
| 445 | dev = bdev->bd_dev; |
| 446 | bdput(bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | dd = find_device(&t->devices, dev); |
| 450 | if (!dd) { |
| 451 | dd = kmalloc(sizeof(*dd), GFP_KERNEL); |
| 452 | if (!dd) |
| 453 | return -ENOMEM; |
| 454 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 455 | dd->dm_dev.mode = mode; |
| 456 | dd->dm_dev.bdev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Jun'ichi Nomura | f165921 | 2006-03-27 01:17:59 -0800 | [diff] [blame] | 458 | if ((r = open_dev(dd, dev, t->md))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | kfree(dd); |
| 460 | return r; |
| 461 | } |
| 462 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 463 | format_dev_t(dd->dm_dev.name, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | atomic_set(&dd->count, 0); |
| 466 | list_add(&dd->list, &t->devices); |
| 467 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 468 | } else if (dd->dm_dev.mode != (mode | dd->dm_dev.mode)) { |
Jun'ichi Nomura | f165921 | 2006-03-27 01:17:59 -0800 | [diff] [blame] | 469 | r = upgrade_mode(dd, mode, t->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | if (r) |
| 471 | return r; |
| 472 | } |
| 473 | atomic_inc(&dd->count); |
| 474 | |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 475 | *result = &dd->dm_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | return 0; |
| 477 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 478 | EXPORT_SYMBOL(dm_get_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 480 | int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 481 | sector_t start, sector_t len, void *data) |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 482 | { |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 483 | struct queue_limits *limits = data; |
| 484 | struct block_device *bdev = dev->bdev; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 485 | struct request_queue *q = bdev_get_queue(bdev); |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 486 | char b[BDEVNAME_SIZE]; |
| 487 | |
| 488 | if (unlikely(!q)) { |
| 489 | DMWARN("%s: Cannot set limits for nonexistent device %s", |
| 490 | dm_device_name(ti->table->md), bdevname(bdev, b)); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 491 | return 0; |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 492 | } |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 493 | |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 494 | if (bdev_stack_limits(limits, bdev, start) < 0) |
| 495 | DMWARN("%s: adding target device %s caused an alignment inconsistency: " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 496 | "physical_block_size=%u, logical_block_size=%u, " |
| 497 | "alignment_offset=%u, start=%llu", |
| 498 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 499 | q->limits.physical_block_size, |
| 500 | q->limits.logical_block_size, |
| 501 | q->limits.alignment_offset, |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 502 | (unsigned long long) start << SECTOR_SHIFT); |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 503 | |
Milan Broz | 9980c63 | 2008-07-21 12:00:39 +0100 | [diff] [blame] | 504 | /* |
| 505 | * Check if merge fn is supported. |
| 506 | * If not we'll force DM to use PAGE_SIZE or |
| 507 | * smaller I/O, just to be safe. |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 508 | */ |
Mikulas Patocka | d5b9dd0 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 509 | if (dm_queue_merge_is_compulsory(q) && !ti->type->merge) |
Mike Snitzer | 72d4cd9 | 2010-12-17 08:34:20 +0100 | [diff] [blame] | 510 | blk_limits_max_hw_sectors(limits, |
| 511 | (unsigned int) (PAGE_SIZE >> 9)); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 512 | return 0; |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 513 | } |
| 514 | EXPORT_SYMBOL_GPL(dm_set_device_limits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | /* |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 517 | * Decrement a device's use count and remove it if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 519 | void dm_put_device(struct dm_target *ti, struct dm_dev *d) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 521 | struct dm_dev_internal *dd = container_of(d, struct dm_dev_internal, |
| 522 | dm_dev); |
| 523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | if (atomic_dec_and_test(&dd->count)) { |
Jun'ichi Nomura | f165921 | 2006-03-27 01:17:59 -0800 | [diff] [blame] | 525 | close_dev(dd, ti->table->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | list_del(&dd->list); |
| 527 | kfree(dd); |
| 528 | } |
| 529 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 530 | EXPORT_SYMBOL(dm_put_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | /* |
| 533 | * Checks to see if the target joins onto the end of the table. |
| 534 | */ |
| 535 | static int adjoin(struct dm_table *table, struct dm_target *ti) |
| 536 | { |
| 537 | struct dm_target *prev; |
| 538 | |
| 539 | if (!table->num_targets) |
| 540 | return !ti->begin; |
| 541 | |
| 542 | prev = &table->targets[table->num_targets - 1]; |
| 543 | return (ti->begin == (prev->begin + prev->len)); |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Used to dynamically allocate the arg array. |
| 548 | */ |
| 549 | static char **realloc_argv(unsigned *array_size, char **old_argv) |
| 550 | { |
| 551 | char **argv; |
| 552 | unsigned new_size; |
| 553 | |
| 554 | new_size = *array_size ? *array_size * 2 : 64; |
| 555 | argv = kmalloc(new_size * sizeof(*argv), GFP_KERNEL); |
| 556 | if (argv) { |
| 557 | memcpy(argv, old_argv, *array_size * sizeof(*argv)); |
| 558 | *array_size = new_size; |
| 559 | } |
| 560 | |
| 561 | kfree(old_argv); |
| 562 | return argv; |
| 563 | } |
| 564 | |
| 565 | /* |
| 566 | * Destructively splits up the argument list to pass to ctr. |
| 567 | */ |
| 568 | int dm_split_args(int *argc, char ***argvp, char *input) |
| 569 | { |
| 570 | char *start, *end = input, *out, **argv = NULL; |
| 571 | unsigned array_size = 0; |
| 572 | |
| 573 | *argc = 0; |
David Teigland | 814d686 | 2006-06-26 00:27:31 -0700 | [diff] [blame] | 574 | |
| 575 | if (!input) { |
| 576 | *argvp = NULL; |
| 577 | return 0; |
| 578 | } |
| 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | argv = realloc_argv(&array_size, argv); |
| 581 | if (!argv) |
| 582 | return -ENOMEM; |
| 583 | |
| 584 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | /* Skip whitespace */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 586 | start = skip_spaces(end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | if (!*start) |
| 589 | break; /* success, we hit the end */ |
| 590 | |
| 591 | /* 'out' is used to remove any back-quotes */ |
| 592 | end = out = start; |
| 593 | while (*end) { |
| 594 | /* Everything apart from '\0' can be quoted */ |
| 595 | if (*end == '\\' && *(end + 1)) { |
| 596 | *out++ = *(end + 1); |
| 597 | end += 2; |
| 598 | continue; |
| 599 | } |
| 600 | |
| 601 | if (isspace(*end)) |
| 602 | break; /* end of token */ |
| 603 | |
| 604 | *out++ = *end++; |
| 605 | } |
| 606 | |
| 607 | /* have we already filled the array ? */ |
| 608 | if ((*argc + 1) > array_size) { |
| 609 | argv = realloc_argv(&array_size, argv); |
| 610 | if (!argv) |
| 611 | return -ENOMEM; |
| 612 | } |
| 613 | |
| 614 | /* we know this is whitespace */ |
| 615 | if (*end) |
| 616 | end++; |
| 617 | |
| 618 | /* terminate the string and put it in the array */ |
| 619 | *out = '\0'; |
| 620 | argv[*argc] = start; |
| 621 | (*argc)++; |
| 622 | } |
| 623 | |
| 624 | *argvp = argv; |
| 625 | return 0; |
| 626 | } |
| 627 | |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 628 | /* |
| 629 | * Impose necessary and sufficient conditions on a devices's table such |
| 630 | * that any incoming bio which respects its logical_block_size can be |
| 631 | * processed successfully. If it falls across the boundary between |
| 632 | * two or more targets, the size of each piece it gets split into must |
| 633 | * be compatible with the logical_block_size of the target processing it. |
| 634 | */ |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 635 | static int validate_hardware_logical_block_alignment(struct dm_table *table, |
| 636 | struct queue_limits *limits) |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 637 | { |
| 638 | /* |
| 639 | * This function uses arithmetic modulo the logical_block_size |
| 640 | * (in units of 512-byte sectors). |
| 641 | */ |
| 642 | unsigned short device_logical_block_size_sects = |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 643 | limits->logical_block_size >> SECTOR_SHIFT; |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 644 | |
| 645 | /* |
| 646 | * Offset of the start of the next table entry, mod logical_block_size. |
| 647 | */ |
| 648 | unsigned short next_target_start = 0; |
| 649 | |
| 650 | /* |
| 651 | * Given an aligned bio that extends beyond the end of a |
| 652 | * target, how many sectors must the next target handle? |
| 653 | */ |
| 654 | unsigned short remaining = 0; |
| 655 | |
| 656 | struct dm_target *uninitialized_var(ti); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 657 | struct queue_limits ti_limits; |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 658 | unsigned i = 0; |
| 659 | |
| 660 | /* |
| 661 | * Check each entry in the table in turn. |
| 662 | */ |
| 663 | while (i < dm_table_get_num_targets(table)) { |
| 664 | ti = dm_table_get_target(table, i++); |
| 665 | |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 666 | blk_set_stacking_limits(&ti_limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 667 | |
| 668 | /* combine all target devices' limits */ |
| 669 | if (ti->type->iterate_devices) |
| 670 | ti->type->iterate_devices(ti, dm_set_device_limits, |
| 671 | &ti_limits); |
| 672 | |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 673 | /* |
| 674 | * If the remaining sectors fall entirely within this |
| 675 | * table entry are they compatible with its logical_block_size? |
| 676 | */ |
| 677 | if (remaining < ti->len && |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 678 | remaining & ((ti_limits.logical_block_size >> |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 679 | SECTOR_SHIFT) - 1)) |
| 680 | break; /* Error */ |
| 681 | |
| 682 | next_target_start = |
| 683 | (unsigned short) ((next_target_start + ti->len) & |
| 684 | (device_logical_block_size_sects - 1)); |
| 685 | remaining = next_target_start ? |
| 686 | device_logical_block_size_sects - next_target_start : 0; |
| 687 | } |
| 688 | |
| 689 | if (remaining) { |
| 690 | DMWARN("%s: table line %u (start sect %llu len %llu) " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 691 | "not aligned to h/w logical block size %u", |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 692 | dm_device_name(table->md), i, |
| 693 | (unsigned long long) ti->begin, |
| 694 | (unsigned long long) ti->len, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 695 | limits->logical_block_size); |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 696 | return -EINVAL; |
| 697 | } |
| 698 | |
| 699 | return 0; |
| 700 | } |
| 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | int dm_table_add_target(struct dm_table *t, const char *type, |
| 703 | sector_t start, sector_t len, char *params) |
| 704 | { |
| 705 | int r = -EINVAL, argc; |
| 706 | char **argv; |
| 707 | struct dm_target *tgt; |
| 708 | |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 709 | if (t->singleton) { |
| 710 | DMERR("%s: target type %s must appear alone in table", |
| 711 | dm_device_name(t->md), t->targets->type->name); |
| 712 | return -EINVAL; |
| 713 | } |
| 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | if ((r = check_space(t))) |
| 716 | return r; |
| 717 | |
| 718 | tgt = t->targets + t->num_targets; |
| 719 | memset(tgt, 0, sizeof(*tgt)); |
| 720 | |
| 721 | if (!len) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 722 | DMERR("%s: zero-length target", dm_device_name(t->md)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | return -EINVAL; |
| 724 | } |
| 725 | |
| 726 | tgt->type = dm_get_target_type(type); |
| 727 | if (!tgt->type) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 728 | DMERR("%s: %s: unknown target type", dm_device_name(t->md), |
| 729 | type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | return -EINVAL; |
| 731 | } |
| 732 | |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 733 | if (dm_target_needs_singleton(tgt->type)) { |
| 734 | if (t->num_targets) { |
| 735 | DMERR("%s: target type %s must appear alone in table", |
| 736 | dm_device_name(t->md), type); |
| 737 | return -EINVAL; |
| 738 | } |
| 739 | t->singleton = 1; |
| 740 | } |
| 741 | |
Alasdair G Kergon | cc6cbe1 | 2011-10-31 20:19:02 +0000 | [diff] [blame] | 742 | if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) { |
| 743 | DMERR("%s: target type %s may not be included in read-only tables", |
| 744 | dm_device_name(t->md), type); |
| 745 | return -EINVAL; |
| 746 | } |
| 747 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 748 | if (t->immutable_target_type) { |
| 749 | if (t->immutable_target_type != tgt->type) { |
| 750 | DMERR("%s: immutable target type %s cannot be mixed with other target types", |
| 751 | dm_device_name(t->md), t->immutable_target_type->name); |
| 752 | return -EINVAL; |
| 753 | } |
| 754 | } else if (dm_target_is_immutable(tgt->type)) { |
| 755 | if (t->num_targets) { |
| 756 | DMERR("%s: immutable target type %s cannot be mixed with other target types", |
| 757 | dm_device_name(t->md), tgt->type->name); |
| 758 | return -EINVAL; |
| 759 | } |
| 760 | t->immutable_target_type = tgt->type; |
| 761 | } |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | tgt->table = t; |
| 764 | tgt->begin = start; |
| 765 | tgt->len = len; |
| 766 | tgt->error = "Unknown error"; |
| 767 | |
| 768 | /* |
| 769 | * Does this target adjoin the previous one ? |
| 770 | */ |
| 771 | if (!adjoin(t, tgt)) { |
| 772 | tgt->error = "Gap in table"; |
| 773 | r = -EINVAL; |
| 774 | goto bad; |
| 775 | } |
| 776 | |
| 777 | r = dm_split_args(&argc, &argv, params); |
| 778 | if (r) { |
| 779 | tgt->error = "couldn't split parameters (insufficient memory)"; |
| 780 | goto bad; |
| 781 | } |
| 782 | |
| 783 | r = tgt->type->ctr(tgt, argc, argv); |
| 784 | kfree(argv); |
| 785 | if (r) |
| 786 | goto bad; |
| 787 | |
| 788 | t->highs[t->num_targets++] = tgt->begin + tgt->len - 1; |
| 789 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 790 | if (!tgt->num_discard_bios && tgt->discards_supported) |
| 791 | DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.", |
Mike Snitzer | 936688d | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 792 | dm_device_name(t->md), type); |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | return 0; |
| 795 | |
| 796 | bad: |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 797 | DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | dm_put_target_type(tgt->type); |
| 799 | return r; |
| 800 | } |
| 801 | |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 802 | /* |
| 803 | * Target argument parsing helpers. |
| 804 | */ |
| 805 | static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 806 | unsigned *value, char **error, unsigned grouped) |
| 807 | { |
| 808 | const char *arg_str = dm_shift_arg(arg_set); |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 809 | char dummy; |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 810 | |
| 811 | if (!arg_str || |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 812 | (sscanf(arg_str, "%u%c", value, &dummy) != 1) || |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 813 | (*value < arg->min) || |
| 814 | (*value > arg->max) || |
| 815 | (grouped && arg_set->argc < *value)) { |
| 816 | *error = arg->error; |
| 817 | return -EINVAL; |
| 818 | } |
| 819 | |
| 820 | return 0; |
| 821 | } |
| 822 | |
| 823 | int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 824 | unsigned *value, char **error) |
| 825 | { |
| 826 | return validate_next_arg(arg, arg_set, value, error, 0); |
| 827 | } |
| 828 | EXPORT_SYMBOL(dm_read_arg); |
| 829 | |
| 830 | int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 831 | unsigned *value, char **error) |
| 832 | { |
| 833 | return validate_next_arg(arg, arg_set, value, error, 1); |
| 834 | } |
| 835 | EXPORT_SYMBOL(dm_read_arg_group); |
| 836 | |
| 837 | const char *dm_shift_arg(struct dm_arg_set *as) |
| 838 | { |
| 839 | char *r; |
| 840 | |
| 841 | if (as->argc) { |
| 842 | as->argc--; |
| 843 | r = *as->argv; |
| 844 | as->argv++; |
| 845 | return r; |
| 846 | } |
| 847 | |
| 848 | return NULL; |
| 849 | } |
| 850 | EXPORT_SYMBOL(dm_shift_arg); |
| 851 | |
| 852 | void dm_consume_args(struct dm_arg_set *as, unsigned num_args) |
| 853 | { |
| 854 | BUG_ON(as->argc < num_args); |
| 855 | as->argc -= num_args; |
| 856 | as->argv += num_args; |
| 857 | } |
| 858 | EXPORT_SYMBOL(dm_consume_args); |
| 859 | |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 860 | static int dm_table_set_type(struct dm_table *t) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 861 | { |
| 862 | unsigned i; |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 863 | unsigned bio_based = 0, request_based = 0, hybrid = 0; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 864 | struct dm_target *tgt; |
| 865 | struct dm_dev_internal *dd; |
| 866 | struct list_head *devices; |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 867 | unsigned live_md_type; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 868 | |
| 869 | for (i = 0; i < t->num_targets; i++) { |
| 870 | tgt = t->targets + i; |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 871 | if (dm_target_hybrid(tgt)) |
| 872 | hybrid = 1; |
| 873 | else if (dm_target_request_based(tgt)) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 874 | request_based = 1; |
| 875 | else |
| 876 | bio_based = 1; |
| 877 | |
| 878 | if (bio_based && request_based) { |
| 879 | DMWARN("Inconsistent table: different target types" |
| 880 | " can't be mixed up"); |
| 881 | return -EINVAL; |
| 882 | } |
| 883 | } |
| 884 | |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 885 | if (hybrid && !bio_based && !request_based) { |
| 886 | /* |
| 887 | * The targets can work either way. |
| 888 | * Determine the type from the live device. |
| 889 | * Default to bio-based if device is new. |
| 890 | */ |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 891 | live_md_type = dm_get_md_type(t->md); |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 892 | if (live_md_type == DM_TYPE_REQUEST_BASED) |
| 893 | request_based = 1; |
| 894 | else |
| 895 | bio_based = 1; |
| 896 | } |
| 897 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 898 | if (bio_based) { |
| 899 | /* We must use this table as bio-based */ |
| 900 | t->type = DM_TYPE_BIO_BASED; |
| 901 | return 0; |
| 902 | } |
| 903 | |
| 904 | BUG_ON(!request_based); /* No targets in this table */ |
| 905 | |
| 906 | /* Non-request-stackable devices can't be used for request-based dm */ |
| 907 | devices = dm_table_get_devices(t); |
| 908 | list_for_each_entry(dd, devices, list) { |
| 909 | if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev.bdev))) { |
| 910 | DMWARN("table load rejected: including" |
| 911 | " non-request-stackable devices"); |
| 912 | return -EINVAL; |
| 913 | } |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * Request-based dm supports only tables that have a single target now. |
| 918 | * To support multiple targets, request splitting support is needed, |
| 919 | * and that needs lots of changes in the block-layer. |
| 920 | * (e.g. request completion process for partial completion.) |
| 921 | */ |
| 922 | if (t->num_targets > 1) { |
| 923 | DMWARN("Request-based dm doesn't support multiple targets yet"); |
| 924 | return -EINVAL; |
| 925 | } |
| 926 | |
| 927 | t->type = DM_TYPE_REQUEST_BASED; |
| 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | unsigned dm_table_get_type(struct dm_table *t) |
| 933 | { |
| 934 | return t->type; |
| 935 | } |
| 936 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 937 | struct target_type *dm_table_get_immutable_target_type(struct dm_table *t) |
| 938 | { |
| 939 | return t->immutable_target_type; |
| 940 | } |
| 941 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 942 | bool dm_table_request_based(struct dm_table *t) |
| 943 | { |
| 944 | return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED; |
| 945 | } |
| 946 | |
| 947 | int dm_table_alloc_md_mempools(struct dm_table *t) |
| 948 | { |
| 949 | unsigned type = dm_table_get_type(t); |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 950 | unsigned per_bio_data_size = 0; |
| 951 | struct dm_target *tgt; |
| 952 | unsigned i; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 953 | |
| 954 | if (unlikely(type == DM_TYPE_NONE)) { |
| 955 | DMWARN("no table type is set, can't allocate mempools"); |
| 956 | return -EINVAL; |
| 957 | } |
| 958 | |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 959 | if (type == DM_TYPE_BIO_BASED) |
| 960 | for (i = 0; i < t->num_targets; i++) { |
| 961 | tgt = t->targets + i; |
| 962 | per_bio_data_size = max(per_bio_data_size, tgt->per_bio_data_size); |
| 963 | } |
| 964 | |
| 965 | t->mempools = dm_alloc_md_mempools(type, t->integrity_supported, per_bio_data_size); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 966 | if (!t->mempools) |
| 967 | return -ENOMEM; |
| 968 | |
| 969 | return 0; |
| 970 | } |
| 971 | |
| 972 | void dm_table_free_md_mempools(struct dm_table *t) |
| 973 | { |
| 974 | dm_free_md_mempools(t->mempools); |
| 975 | t->mempools = NULL; |
| 976 | } |
| 977 | |
| 978 | struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t) |
| 979 | { |
| 980 | return t->mempools; |
| 981 | } |
| 982 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | static int setup_indexes(struct dm_table *t) |
| 984 | { |
| 985 | int i; |
| 986 | unsigned int total = 0; |
| 987 | sector_t *indexes; |
| 988 | |
| 989 | /* allocate the space for *all* the indexes */ |
| 990 | for (i = t->depth - 2; i >= 0; i--) { |
| 991 | t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE); |
| 992 | total += t->counts[i]; |
| 993 | } |
| 994 | |
| 995 | indexes = (sector_t *) dm_vcalloc(total, (unsigned long) NODE_SIZE); |
| 996 | if (!indexes) |
| 997 | return -ENOMEM; |
| 998 | |
| 999 | /* set up internal nodes, bottom-up */ |
Jun'ichi Nomura | 82d601d | 2008-02-08 02:10:04 +0000 | [diff] [blame] | 1000 | for (i = t->depth - 2; i >= 0; i--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | t->index[i] = indexes; |
| 1002 | indexes += (KEYS_PER_NODE * t->counts[i]); |
| 1003 | setup_btree_index(i, t); |
| 1004 | } |
| 1005 | |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * Builds the btree to index the map. |
| 1011 | */ |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1012 | static int dm_table_build_index(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | { |
| 1014 | int r = 0; |
| 1015 | unsigned int leaf_nodes; |
| 1016 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | /* how many indexes will the btree have ? */ |
| 1018 | leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE); |
| 1019 | t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE); |
| 1020 | |
| 1021 | /* leaf layer has already been set up */ |
| 1022 | t->counts[t->depth - 1] = leaf_nodes; |
| 1023 | t->index[t->depth - 1] = t->highs; |
| 1024 | |
| 1025 | if (t->depth >= 2) |
| 1026 | r = setup_indexes(t); |
| 1027 | |
| 1028 | return r; |
| 1029 | } |
| 1030 | |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1031 | /* |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1032 | * Get a disk whose integrity profile reflects the table's profile. |
| 1033 | * If %match_all is true, all devices' profiles must match. |
| 1034 | * If %match_all is false, all devices must at least have an |
| 1035 | * allocated integrity profile; but uninitialized is ok. |
| 1036 | * Returns NULL if integrity support was inconsistent or unavailable. |
| 1037 | */ |
| 1038 | static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t, |
| 1039 | bool match_all) |
| 1040 | { |
| 1041 | struct list_head *devices = dm_table_get_devices(t); |
| 1042 | struct dm_dev_internal *dd = NULL; |
| 1043 | struct gendisk *prev_disk = NULL, *template_disk = NULL; |
| 1044 | |
| 1045 | list_for_each_entry(dd, devices, list) { |
| 1046 | template_disk = dd->dm_dev.bdev->bd_disk; |
| 1047 | if (!blk_get_integrity(template_disk)) |
| 1048 | goto no_integrity; |
| 1049 | if (!match_all && !blk_integrity_is_initialized(template_disk)) |
| 1050 | continue; /* skip uninitialized profiles */ |
| 1051 | else if (prev_disk && |
| 1052 | blk_integrity_compare(prev_disk, template_disk) < 0) |
| 1053 | goto no_integrity; |
| 1054 | prev_disk = template_disk; |
| 1055 | } |
| 1056 | |
| 1057 | return template_disk; |
| 1058 | |
| 1059 | no_integrity: |
| 1060 | if (prev_disk) |
| 1061 | DMWARN("%s: integrity not set: %s and %s profile mismatch", |
| 1062 | dm_device_name(t->md), |
| 1063 | prev_disk->disk_name, |
| 1064 | template_disk->disk_name); |
| 1065 | return NULL; |
| 1066 | } |
| 1067 | |
| 1068 | /* |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1069 | * Register the mapped device for blk_integrity support if |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1070 | * the underlying devices have an integrity profile. But all devices |
| 1071 | * may not have matching profiles (checking all devices isn't reliable |
| 1072 | * during table load because this table may use other DM device(s) which |
| 1073 | * must be resumed before they will have an initialized integity profile). |
| 1074 | * Stacked DM devices force a 2 stage integrity profile validation: |
| 1075 | * 1 - during load, validate all initialized integrity profiles match |
| 1076 | * 2 - during resume, validate all integrity profiles match |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1077 | */ |
| 1078 | static int dm_table_prealloc_integrity(struct dm_table *t, struct mapped_device *md) |
| 1079 | { |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1080 | struct gendisk *template_disk = NULL; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1081 | |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1082 | template_disk = dm_table_get_integrity_disk(t, false); |
| 1083 | if (!template_disk) |
| 1084 | return 0; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1085 | |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1086 | if (!blk_integrity_is_initialized(dm_disk(md))) { |
| 1087 | t->integrity_supported = 1; |
| 1088 | return blk_integrity_register(dm_disk(md), NULL); |
| 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * If DM device already has an initalized integrity |
| 1093 | * profile the new profile should not conflict. |
| 1094 | */ |
| 1095 | if (blk_integrity_is_initialized(template_disk) && |
| 1096 | blk_integrity_compare(dm_disk(md), template_disk) < 0) { |
| 1097 | DMWARN("%s: conflict with existing integrity profile: " |
| 1098 | "%s profile mismatch", |
| 1099 | dm_device_name(t->md), |
| 1100 | template_disk->disk_name); |
| 1101 | return 1; |
| 1102 | } |
| 1103 | |
| 1104 | /* Preserve existing initialized integrity profile */ |
| 1105 | t->integrity_supported = 1; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * Prepares the table for use by building the indices, |
| 1111 | * setting the type, and allocating mempools. |
| 1112 | */ |
| 1113 | int dm_table_complete(struct dm_table *t) |
| 1114 | { |
| 1115 | int r; |
| 1116 | |
| 1117 | r = dm_table_set_type(t); |
| 1118 | if (r) { |
| 1119 | DMERR("unable to set table type"); |
| 1120 | return r; |
| 1121 | } |
| 1122 | |
| 1123 | r = dm_table_build_index(t); |
| 1124 | if (r) { |
| 1125 | DMERR("unable to build btrees"); |
| 1126 | return r; |
| 1127 | } |
| 1128 | |
| 1129 | r = dm_table_prealloc_integrity(t, t->md); |
| 1130 | if (r) { |
| 1131 | DMERR("could not register integrity profile."); |
| 1132 | return r; |
| 1133 | } |
| 1134 | |
| 1135 | r = dm_table_alloc_md_mempools(t); |
| 1136 | if (r) |
| 1137 | DMERR("unable to allocate mempools"); |
| 1138 | |
| 1139 | return r; |
| 1140 | } |
| 1141 | |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1142 | static DEFINE_MUTEX(_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | void dm_table_event_callback(struct dm_table *t, |
| 1144 | void (*fn)(void *), void *context) |
| 1145 | { |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1146 | mutex_lock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | t->event_fn = fn; |
| 1148 | t->event_context = context; |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1149 | mutex_unlock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | } |
| 1151 | |
| 1152 | void dm_table_event(struct dm_table *t) |
| 1153 | { |
| 1154 | /* |
| 1155 | * You can no longer call dm_table_event() from interrupt |
| 1156 | * context, use a bottom half instead. |
| 1157 | */ |
| 1158 | BUG_ON(in_interrupt()); |
| 1159 | |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1160 | mutex_lock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | if (t->event_fn) |
| 1162 | t->event_fn(t->event_context); |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1163 | mutex_unlock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1165 | EXPORT_SYMBOL(dm_table_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | sector_t dm_table_get_size(struct dm_table *t) |
| 1168 | { |
| 1169 | return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0; |
| 1170 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1171 | EXPORT_SYMBOL(dm_table_get_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
| 1173 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) |
| 1174 | { |
Milan Broz | 1435353 | 2006-06-26 00:27:27 -0700 | [diff] [blame] | 1175 | if (index >= t->num_targets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | return NULL; |
| 1177 | |
| 1178 | return t->targets + index; |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * Search the btree for the correct target. |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1183 | * |
| 1184 | * Caller should check returned pointer with dm_target_is_valid() |
| 1185 | * to trap I/O beyond end of device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | */ |
| 1187 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) |
| 1188 | { |
| 1189 | unsigned int l, n = 0, k = 0; |
| 1190 | sector_t *node; |
| 1191 | |
| 1192 | for (l = 0; l < t->depth; l++) { |
| 1193 | n = get_child(n, k); |
| 1194 | node = get_node(t, l, n); |
| 1195 | |
| 1196 | for (k = 0; k < KEYS_PER_NODE; k++) |
| 1197 | if (node[k] >= sector) |
| 1198 | break; |
| 1199 | } |
| 1200 | |
| 1201 | return &t->targets[(KEYS_PER_NODE * n) + k]; |
| 1202 | } |
| 1203 | |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 1204 | static int count_device(struct dm_target *ti, struct dm_dev *dev, |
| 1205 | sector_t start, sector_t len, void *data) |
| 1206 | { |
| 1207 | unsigned *num_devices = data; |
| 1208 | |
| 1209 | (*num_devices)++; |
| 1210 | |
| 1211 | return 0; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Check whether a table has no data devices attached using each |
| 1216 | * target's iterate_devices method. |
| 1217 | * Returns false if the result is unknown because a target doesn't |
| 1218 | * support iterate_devices. |
| 1219 | */ |
| 1220 | bool dm_table_has_no_data_devices(struct dm_table *table) |
| 1221 | { |
| 1222 | struct dm_target *uninitialized_var(ti); |
| 1223 | unsigned i = 0, num_devices = 0; |
| 1224 | |
| 1225 | while (i < dm_table_get_num_targets(table)) { |
| 1226 | ti = dm_table_get_target(table, i++); |
| 1227 | |
| 1228 | if (!ti->type->iterate_devices) |
| 1229 | return false; |
| 1230 | |
| 1231 | ti->type->iterate_devices(ti, count_device, &num_devices); |
| 1232 | if (num_devices) |
| 1233 | return false; |
| 1234 | } |
| 1235 | |
| 1236 | return true; |
| 1237 | } |
| 1238 | |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1239 | /* |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1240 | * Establish the new table's queue_limits and validate them. |
| 1241 | */ |
| 1242 | int dm_calculate_queue_limits(struct dm_table *table, |
| 1243 | struct queue_limits *limits) |
| 1244 | { |
| 1245 | struct dm_target *uninitialized_var(ti); |
| 1246 | struct queue_limits ti_limits; |
| 1247 | unsigned i = 0; |
| 1248 | |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 1249 | blk_set_stacking_limits(limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1250 | |
| 1251 | while (i < dm_table_get_num_targets(table)) { |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 1252 | blk_set_stacking_limits(&ti_limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1253 | |
| 1254 | ti = dm_table_get_target(table, i++); |
| 1255 | |
| 1256 | if (!ti->type->iterate_devices) |
| 1257 | goto combine_limits; |
| 1258 | |
| 1259 | /* |
| 1260 | * Combine queue limits of all the devices this target uses. |
| 1261 | */ |
| 1262 | ti->type->iterate_devices(ti, dm_set_device_limits, |
| 1263 | &ti_limits); |
| 1264 | |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 1265 | /* Set I/O hints portion of queue limits */ |
| 1266 | if (ti->type->io_hints) |
| 1267 | ti->type->io_hints(ti, &ti_limits); |
| 1268 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1269 | /* |
| 1270 | * Check each device area is consistent with the target's |
| 1271 | * overall queue limits. |
| 1272 | */ |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 1273 | if (ti->type->iterate_devices(ti, device_area_is_invalid, |
| 1274 | &ti_limits)) |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1275 | return -EINVAL; |
| 1276 | |
| 1277 | combine_limits: |
| 1278 | /* |
| 1279 | * Merge this target's queue limits into the overall limits |
| 1280 | * for the table. |
| 1281 | */ |
| 1282 | if (blk_stack_limits(limits, &ti_limits, 0) < 0) |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 1283 | DMWARN("%s: adding target device " |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1284 | "(start sect %llu len %llu) " |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 1285 | "caused an alignment inconsistency", |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1286 | dm_device_name(table->md), |
| 1287 | (unsigned long long) ti->begin, |
| 1288 | (unsigned long long) ti->len); |
| 1289 | } |
| 1290 | |
| 1291 | return validate_hardware_logical_block_alignment(table, limits); |
| 1292 | } |
| 1293 | |
| 1294 | /* |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1295 | * Set the integrity profile for this device if all devices used have |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1296 | * matching profiles. We're quite deep in the resume path but still |
| 1297 | * don't know if all devices (particularly DM devices this device |
| 1298 | * may be stacked on) have matching profiles. Even if the profiles |
| 1299 | * don't match we have no way to fail (to resume) at this point. |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1300 | */ |
| 1301 | static void dm_table_set_integrity(struct dm_table *t) |
| 1302 | { |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1303 | struct gendisk *template_disk = NULL; |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1304 | |
| 1305 | if (!blk_get_integrity(dm_disk(t->md))) |
| 1306 | return; |
| 1307 | |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1308 | template_disk = dm_table_get_integrity_disk(t, true); |
Mike Snitzer | 876fbba | 2011-09-25 23:26:17 +0100 | [diff] [blame] | 1309 | if (template_disk) |
| 1310 | blk_integrity_register(dm_disk(t->md), |
| 1311 | blk_get_integrity(template_disk)); |
| 1312 | else if (blk_integrity_is_initialized(dm_disk(t->md))) |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1313 | DMWARN("%s: device no longer has a valid integrity profile", |
| 1314 | dm_device_name(t->md)); |
Mike Snitzer | 876fbba | 2011-09-25 23:26:17 +0100 | [diff] [blame] | 1315 | else |
| 1316 | DMWARN("%s: unable to establish an integrity profile", |
| 1317 | dm_device_name(t->md)); |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1318 | } |
| 1319 | |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1320 | static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1321 | sector_t start, sector_t len, void *data) |
| 1322 | { |
| 1323 | unsigned flush = (*(unsigned *)data); |
| 1324 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1325 | |
| 1326 | return q && (q->flush_flags & flush); |
| 1327 | } |
| 1328 | |
| 1329 | static bool dm_table_supports_flush(struct dm_table *t, unsigned flush) |
| 1330 | { |
| 1331 | struct dm_target *ti; |
| 1332 | unsigned i = 0; |
| 1333 | |
| 1334 | /* |
| 1335 | * Require at least one underlying device to support flushes. |
| 1336 | * t->devices includes internal dm devices such as mirror logs |
| 1337 | * so we need to use iterate_devices here, which targets |
| 1338 | * supporting flushes must provide. |
| 1339 | */ |
| 1340 | while (i < dm_table_get_num_targets(t)) { |
| 1341 | ti = dm_table_get_target(t, i++); |
| 1342 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1343 | if (!ti->num_flush_bios) |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1344 | continue; |
| 1345 | |
Joe Thornber | 0e9c24e | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 1346 | if (ti->flush_supported) |
| 1347 | return 1; |
| 1348 | |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1349 | if (ti->type->iterate_devices && |
| 1350 | ti->type->iterate_devices(ti, device_flush_capable, &flush)) |
| 1351 | return 1; |
| 1352 | } |
| 1353 | |
| 1354 | return 0; |
| 1355 | } |
| 1356 | |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1357 | static bool dm_table_discard_zeroes_data(struct dm_table *t) |
| 1358 | { |
| 1359 | struct dm_target *ti; |
| 1360 | unsigned i = 0; |
| 1361 | |
| 1362 | /* Ensure that all targets supports discard_zeroes_data. */ |
| 1363 | while (i < dm_table_get_num_targets(t)) { |
| 1364 | ti = dm_table_get_target(t, i++); |
| 1365 | |
| 1366 | if (ti->discard_zeroes_data_unsupported) |
| 1367 | return 0; |
| 1368 | } |
| 1369 | |
| 1370 | return 1; |
| 1371 | } |
| 1372 | |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1373 | static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev, |
| 1374 | sector_t start, sector_t len, void *data) |
| 1375 | { |
| 1376 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1377 | |
| 1378 | return q && blk_queue_nonrot(q); |
| 1379 | } |
| 1380 | |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1381 | static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, |
| 1382 | sector_t start, sector_t len, void *data) |
| 1383 | { |
| 1384 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1385 | |
| 1386 | return q && !blk_queue_add_random(q); |
| 1387 | } |
| 1388 | |
| 1389 | static bool dm_table_all_devices_attribute(struct dm_table *t, |
| 1390 | iterate_devices_callout_fn func) |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1391 | { |
| 1392 | struct dm_target *ti; |
| 1393 | unsigned i = 0; |
| 1394 | |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1395 | while (i < dm_table_get_num_targets(t)) { |
| 1396 | ti = dm_table_get_target(t, i++); |
| 1397 | |
| 1398 | if (!ti->type->iterate_devices || |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1399 | !ti->type->iterate_devices(ti, func, NULL)) |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1400 | return 0; |
| 1401 | } |
| 1402 | |
| 1403 | return 1; |
| 1404 | } |
| 1405 | |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1406 | static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1407 | sector_t start, sector_t len, void *data) |
| 1408 | { |
| 1409 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1410 | |
| 1411 | return q && !q->limits.max_write_same_sectors; |
| 1412 | } |
| 1413 | |
| 1414 | static bool dm_table_supports_write_same(struct dm_table *t) |
| 1415 | { |
| 1416 | struct dm_target *ti; |
| 1417 | unsigned i = 0; |
| 1418 | |
| 1419 | while (i < dm_table_get_num_targets(t)) { |
| 1420 | ti = dm_table_get_target(t, i++); |
| 1421 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1422 | if (!ti->num_write_same_bios) |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1423 | return false; |
| 1424 | |
| 1425 | if (!ti->type->iterate_devices || |
Mike Snitzer | dc019b2 | 2013-05-10 14:37:16 +0100 | [diff] [blame] | 1426 | ti->type->iterate_devices(ti, device_not_write_same_capable, NULL)) |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1427 | return false; |
| 1428 | } |
| 1429 | |
| 1430 | return true; |
| 1431 | } |
| 1432 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1433 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, |
| 1434 | struct queue_limits *limits) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | { |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1436 | unsigned flush = 0; |
| 1437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | /* |
Mike Snitzer | 1197764 | 2009-06-22 10:12:32 +0100 | [diff] [blame] | 1439 | * Copy table's limits to the DM device's request_queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | */ |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1441 | q->limits = *limits; |
Jens Axboe | c9a3f6d | 2008-04-29 19:12:35 +0200 | [diff] [blame] | 1442 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1443 | if (!dm_table_supports_discards(t)) |
| 1444 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); |
| 1445 | else |
| 1446 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| 1447 | |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1448 | if (dm_table_supports_flush(t, REQ_FLUSH)) { |
| 1449 | flush |= REQ_FLUSH; |
| 1450 | if (dm_table_supports_flush(t, REQ_FUA)) |
| 1451 | flush |= REQ_FUA; |
| 1452 | } |
| 1453 | blk_queue_flush(q, flush); |
| 1454 | |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1455 | if (!dm_table_discard_zeroes_data(t)) |
| 1456 | q->limits.discard_zeroes_data = 0; |
| 1457 | |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1458 | /* Ensure that all underlying devices are non-rotational. */ |
| 1459 | if (dm_table_all_devices_attribute(t, device_is_nonrot)) |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1460 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
| 1461 | else |
| 1462 | queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q); |
| 1463 | |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1464 | if (!dm_table_supports_write_same(t)) |
| 1465 | q->limits.max_write_same_sectors = 0; |
Mike Snitzer | c1a9467 | 2012-12-21 20:23:30 +0000 | [diff] [blame] | 1466 | |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1467 | dm_table_set_integrity(t); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1468 | |
| 1469 | /* |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1470 | * Determine whether or not this queue's I/O timings contribute |
| 1471 | * to the entropy pool, Only request-based targets use this. |
| 1472 | * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not |
| 1473 | * have it set. |
| 1474 | */ |
| 1475 | if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random)) |
| 1476 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); |
| 1477 | |
| 1478 | /* |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1479 | * QUEUE_FLAG_STACKABLE must be set after all queue settings are |
| 1480 | * visible to other CPUs because, once the flag is set, incoming bios |
| 1481 | * are processed by request-based dm, which refers to the queue |
| 1482 | * settings. |
| 1483 | * Until the flag set, bios are passed to bio-based dm and queued to |
| 1484 | * md->deferred where queue settings are not needed yet. |
| 1485 | * Those bios are passed to request-based dm at the resume time. |
| 1486 | */ |
| 1487 | smp_mb(); |
| 1488 | if (dm_table_request_based(t)) |
| 1489 | queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | } |
| 1491 | |
| 1492 | unsigned int dm_table_get_num_targets(struct dm_table *t) |
| 1493 | { |
| 1494 | return t->num_targets; |
| 1495 | } |
| 1496 | |
| 1497 | struct list_head *dm_table_get_devices(struct dm_table *t) |
| 1498 | { |
| 1499 | return &t->devices; |
| 1500 | } |
| 1501 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1502 | fmode_t dm_table_get_mode(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | { |
| 1504 | return t->mode; |
| 1505 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1506 | EXPORT_SYMBOL(dm_table_get_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
| 1508 | static void suspend_targets(struct dm_table *t, unsigned postsuspend) |
| 1509 | { |
| 1510 | int i = t->num_targets; |
| 1511 | struct dm_target *ti = t->targets; |
| 1512 | |
| 1513 | while (i--) { |
| 1514 | if (postsuspend) { |
| 1515 | if (ti->type->postsuspend) |
| 1516 | ti->type->postsuspend(ti); |
| 1517 | } else if (ti->type->presuspend) |
| 1518 | ti->type->presuspend(ti); |
| 1519 | |
| 1520 | ti++; |
| 1521 | } |
| 1522 | } |
| 1523 | |
| 1524 | void dm_table_presuspend_targets(struct dm_table *t) |
| 1525 | { |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1526 | if (!t) |
| 1527 | return; |
| 1528 | |
Adrian Bunk | e8488d0 | 2008-04-24 22:10:51 +0100 | [diff] [blame] | 1529 | suspend_targets(t, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | } |
| 1531 | |
| 1532 | void dm_table_postsuspend_targets(struct dm_table *t) |
| 1533 | { |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1534 | if (!t) |
| 1535 | return; |
| 1536 | |
Adrian Bunk | e8488d0 | 2008-04-24 22:10:51 +0100 | [diff] [blame] | 1537 | suspend_targets(t, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1540 | int dm_table_resume_targets(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | { |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1542 | int i, r = 0; |
| 1543 | |
| 1544 | for (i = 0; i < t->num_targets; i++) { |
| 1545 | struct dm_target *ti = t->targets + i; |
| 1546 | |
| 1547 | if (!ti->type->preresume) |
| 1548 | continue; |
| 1549 | |
| 1550 | r = ti->type->preresume(ti); |
| 1551 | if (r) |
| 1552 | return r; |
| 1553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | |
| 1555 | for (i = 0; i < t->num_targets; i++) { |
| 1556 | struct dm_target *ti = t->targets + i; |
| 1557 | |
| 1558 | if (ti->type->resume) |
| 1559 | ti->type->resume(ti); |
| 1560 | } |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1561 | |
| 1562 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | } |
| 1564 | |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1565 | void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb) |
| 1566 | { |
| 1567 | list_add(&cb->list, &t->target_callbacks); |
| 1568 | } |
| 1569 | EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks); |
| 1570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | int dm_table_any_congested(struct dm_table *t, int bdi_bits) |
| 1572 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 1573 | struct dm_dev_internal *dd; |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 1574 | struct list_head *devices = dm_table_get_devices(t); |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1575 | struct dm_target_callbacks *cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | int r = 0; |
| 1577 | |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 1578 | list_for_each_entry(dd, devices, list) { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 1579 | struct request_queue *q = bdev_get_queue(dd->dm_dev.bdev); |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 1580 | char b[BDEVNAME_SIZE]; |
| 1581 | |
| 1582 | if (likely(q)) |
| 1583 | r |= bdi_congested(&q->backing_dev_info, bdi_bits); |
| 1584 | else |
| 1585 | DMWARN_LIMIT("%s: any_congested: nonexistent device %s", |
| 1586 | dm_device_name(t->md), |
| 1587 | bdevname(dd->dm_dev.bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | } |
| 1589 | |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1590 | list_for_each_entry(cb, &t->target_callbacks, list) |
| 1591 | if (cb->congested_fn) |
| 1592 | r |= cb->congested_fn(cb, bdi_bits); |
| 1593 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | return r; |
| 1595 | } |
| 1596 | |
Kiyoshi Ueda | cec47e3 | 2009-06-22 10:12:35 +0100 | [diff] [blame] | 1597 | int dm_table_any_busy_target(struct dm_table *t) |
| 1598 | { |
| 1599 | unsigned i; |
| 1600 | struct dm_target *ti; |
| 1601 | |
| 1602 | for (i = 0; i < t->num_targets; i++) { |
| 1603 | ti = t->targets + i; |
| 1604 | if (ti->type->busy && ti->type->busy(ti)) |
| 1605 | return 1; |
| 1606 | } |
| 1607 | |
| 1608 | return 0; |
| 1609 | } |
| 1610 | |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1611 | struct mapped_device *dm_table_get_md(struct dm_table *t) |
| 1612 | { |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1613 | return t->md; |
| 1614 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1615 | EXPORT_SYMBOL(dm_table_get_md); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1616 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1617 | static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1618 | sector_t start, sector_t len, void *data) |
| 1619 | { |
| 1620 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1621 | |
| 1622 | return q && blk_queue_discard(q); |
| 1623 | } |
| 1624 | |
| 1625 | bool dm_table_supports_discards(struct dm_table *t) |
| 1626 | { |
| 1627 | struct dm_target *ti; |
| 1628 | unsigned i = 0; |
| 1629 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1630 | /* |
Mike Snitzer | 4c25932 | 2011-05-29 12:52:55 +0100 | [diff] [blame] | 1631 | * Unless any target used by the table set discards_supported, |
| 1632 | * require at least one underlying device to support discards. |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1633 | * t->devices includes internal dm devices such as mirror logs |
| 1634 | * so we need to use iterate_devices here, which targets |
Mike Snitzer | 936688d | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 1635 | * supporting discard selectively must provide. |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1636 | */ |
| 1637 | while (i < dm_table_get_num_targets(t)) { |
| 1638 | ti = dm_table_get_target(t, i++); |
| 1639 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1640 | if (!ti->num_discard_bios) |
Mike Snitzer | 936688d | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 1641 | continue; |
| 1642 | |
Mike Snitzer | 4c25932 | 2011-05-29 12:52:55 +0100 | [diff] [blame] | 1643 | if (ti->discards_supported) |
| 1644 | return 1; |
| 1645 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1646 | if (ti->type->iterate_devices && |
| 1647 | ti->type->iterate_devices(ti, device_discard_capable, NULL)) |
| 1648 | return 1; |
| 1649 | } |
| 1650 | |
| 1651 | return 0; |
| 1652 | } |