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 | |
Mike Snitzer | 4cc9613 | 2016-05-12 16:28:10 -0400 | [diff] [blame] | 8 | #include "dm-core.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 21 | #include <linux/blk-mq.h> |
Dan Ehrenberg | 644bda6 | 2015-02-10 15:20:51 -0800 | [diff] [blame] | 22 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 24 | #define DM_MSG_PREFIX "table" |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #define MAX_DEPTH 16 |
| 27 | #define NODE_SIZE L1_CACHE_BYTES |
| 28 | #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t)) |
| 29 | #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1) |
| 30 | |
| 31 | struct dm_table { |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 32 | struct mapped_device *md; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 33 | unsigned type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | /* btree table */ |
| 36 | unsigned int depth; |
| 37 | unsigned int counts[MAX_DEPTH]; /* in nodes */ |
| 38 | sector_t *index[MAX_DEPTH]; |
| 39 | |
| 40 | unsigned int num_targets; |
| 41 | unsigned int num_allocated; |
| 42 | sector_t *highs; |
| 43 | struct dm_target *targets; |
| 44 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 45 | struct target_type *immutable_target_type; |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 46 | |
| 47 | bool integrity_supported:1; |
| 48 | bool singleton:1; |
| 49 | bool all_blk_mq:1; |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* |
| 52 | * Indicates the rw permissions for the new logical |
| 53 | * device. This should be a combination of FMODE_READ |
| 54 | * and FMODE_WRITE. |
| 55 | */ |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 56 | fmode_t mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* a list of devices used by this table */ |
| 59 | struct list_head devices; |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | /* events get handed up using this callback */ |
| 62 | void (*event_fn)(void *); |
| 63 | void *event_context; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 64 | |
| 65 | struct dm_md_mempools *mempools; |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 66 | |
| 67 | struct list_head target_callbacks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
| 70 | /* |
| 71 | * Similar to ceiling(log_size(n)) |
| 72 | */ |
| 73 | static unsigned int int_log(unsigned int n, unsigned int base) |
| 74 | { |
| 75 | int result = 0; |
| 76 | |
| 77 | while (n > 1) { |
| 78 | n = dm_div_up(n, base); |
| 79 | result++; |
| 80 | } |
| 81 | |
| 82 | return result; |
| 83 | } |
| 84 | |
| 85 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | * Calculate the index of the child node of the n'th node k'th key. |
| 87 | */ |
| 88 | static inline unsigned int get_child(unsigned int n, unsigned int k) |
| 89 | { |
| 90 | return (n * CHILDREN_PER_NODE) + k; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Return the n'th node of level l from table t. |
| 95 | */ |
| 96 | static inline sector_t *get_node(struct dm_table *t, |
| 97 | unsigned int l, unsigned int n) |
| 98 | { |
| 99 | return t->index[l] + (n * KEYS_PER_NODE); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Return the highest key that you could lookup from the n'th |
| 104 | * node on level l of the btree. |
| 105 | */ |
| 106 | static sector_t high(struct dm_table *t, unsigned int l, unsigned int n) |
| 107 | { |
| 108 | for (; l < t->depth - 1; l++) |
| 109 | n = get_child(n, CHILDREN_PER_NODE - 1); |
| 110 | |
| 111 | if (n >= t->counts[l]) |
| 112 | return (sector_t) - 1; |
| 113 | |
| 114 | return get_node(t, l, n)[KEYS_PER_NODE - 1]; |
| 115 | } |
| 116 | |
| 117 | /* |
| 118 | * Fills in a level of the btree based on the highs of the level |
| 119 | * below it. |
| 120 | */ |
| 121 | static int setup_btree_index(unsigned int l, struct dm_table *t) |
| 122 | { |
| 123 | unsigned int n, k; |
| 124 | sector_t *node; |
| 125 | |
| 126 | for (n = 0U; n < t->counts[l]; n++) { |
| 127 | node = get_node(t, l, n); |
| 128 | |
| 129 | for (k = 0U; k < KEYS_PER_NODE; k++) |
| 130 | node[k] = high(t, l + 1, get_child(n, k)); |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size) |
| 137 | { |
| 138 | unsigned long size; |
| 139 | void *addr; |
| 140 | |
| 141 | /* |
| 142 | * Check that we're not going to overflow. |
| 143 | */ |
| 144 | if (nmemb > (ULONG_MAX / elem_size)) |
| 145 | return NULL; |
| 146 | |
| 147 | size = nmemb * elem_size; |
Joe Perches | e29e65a | 2011-08-02 12:32:02 +0100 | [diff] [blame] | 148 | addr = vzalloc(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | return addr; |
| 151 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 152 | EXPORT_SYMBOL(dm_vcalloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | /* |
| 155 | * highs, and targets are managed as dynamic arrays during a |
| 156 | * table load. |
| 157 | */ |
| 158 | static int alloc_targets(struct dm_table *t, unsigned int num) |
| 159 | { |
| 160 | sector_t *n_highs; |
| 161 | struct dm_target *n_targets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | /* |
| 164 | * Allocate both the target array and offset array at once. |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 165 | * Append an empty entry to catch sectors beyond the end of |
| 166 | * the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | */ |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 168 | n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | sizeof(sector_t)); |
| 170 | if (!n_highs) |
| 171 | return -ENOMEM; |
| 172 | |
| 173 | n_targets = (struct dm_target *) (n_highs + num); |
| 174 | |
Mikulas Patocka | 57a2f23 | 2013-11-22 19:51:39 -0500 | [diff] [blame] | 175 | memset(n_highs, -1, sizeof(*n_highs) * num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | vfree(t->highs); |
| 177 | |
| 178 | t->num_allocated = num; |
| 179 | t->highs = n_highs; |
| 180 | t->targets = n_targets; |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 185 | int dm_table_create(struct dm_table **result, fmode_t mode, |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 186 | unsigned num_targets, struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
Dmitry Monakhov | 094262d | 2007-10-19 22:38:51 +0100 | [diff] [blame] | 188 | struct dm_table *t = kzalloc(sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | if (!t) |
| 191 | return -ENOMEM; |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | INIT_LIST_HEAD(&t->devices); |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 194 | INIT_LIST_HEAD(&t->target_callbacks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
| 196 | if (!num_targets) |
| 197 | num_targets = KEYS_PER_NODE; |
| 198 | |
| 199 | num_targets = dm_round_up(num_targets, KEYS_PER_NODE); |
| 200 | |
Mikulas Patocka | 5b2d065 | 2013-11-22 19:52:06 -0500 | [diff] [blame] | 201 | if (!num_targets) { |
| 202 | kfree(t); |
| 203 | return -ENOMEM; |
| 204 | } |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (alloc_targets(t, num_targets)) { |
| 207 | kfree(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | return -ENOMEM; |
| 209 | } |
| 210 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 211 | t->type = DM_TYPE_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | t->mode = mode; |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 213 | t->md = md; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | *result = t; |
| 215 | return 0; |
| 216 | } |
| 217 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 218 | static void free_devices(struct list_head *devices, struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
| 220 | struct list_head *tmp, *next; |
| 221 | |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 222 | list_for_each_safe(tmp, next, devices) { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 223 | struct dm_dev_internal *dd = |
| 224 | list_entry(tmp, struct dm_dev_internal, list); |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 225 | DMWARN("%s: dm_table_destroy: dm_put_device call missing for %s", |
| 226 | dm_device_name(md), dd->dm_dev->name); |
| 227 | dm_put_table_device(md, dd->dm_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | kfree(dd); |
| 229 | } |
| 230 | } |
| 231 | |
Mikulas Patocka | d581687 | 2009-01-06 03:05:10 +0000 | [diff] [blame] | 232 | void dm_table_destroy(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | { |
| 234 | unsigned int i; |
| 235 | |
Alasdair G Kergon | a794015 | 2009-12-10 23:52:23 +0000 | [diff] [blame] | 236 | if (!t) |
| 237 | return; |
| 238 | |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 239 | /* free the indexes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (t->depth >= 2) |
| 241 | vfree(t->index[t->depth - 2]); |
| 242 | |
| 243 | /* free the targets */ |
| 244 | for (i = 0; i < t->num_targets; i++) { |
| 245 | struct dm_target *tgt = t->targets + i; |
| 246 | |
| 247 | if (tgt->type->dtr) |
| 248 | tgt->type->dtr(tgt); |
| 249 | |
| 250 | dm_put_target_type(tgt->type); |
| 251 | } |
| 252 | |
| 253 | vfree(t->highs); |
| 254 | |
| 255 | /* free the device list */ |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 256 | free_devices(&t->devices, t->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 258 | dm_free_md_mempools(t->mempools); |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | kfree(t); |
| 261 | } |
| 262 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | * See if we've already got a device in the list. |
| 265 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 266 | 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] | 267 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 268 | struct dm_dev_internal *dd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | list_for_each_entry (dd, l, list) |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 271 | if (dd->dm_dev->bdev->bd_dev == dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | return dd; |
| 273 | |
| 274 | return NULL; |
| 275 | } |
| 276 | |
| 277 | /* |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 278 | * If possible, this checks an area of a destination device is invalid. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | */ |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 280 | static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev, |
| 281 | sector_t start, sector_t len, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | { |
Milan Broz | f4808ca | 2011-05-29 13:02:52 +0100 | [diff] [blame] | 283 | struct request_queue *q; |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 284 | struct queue_limits *limits = data; |
| 285 | struct block_device *bdev = dev->bdev; |
| 286 | sector_t dev_size = |
| 287 | i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 288 | unsigned short logical_block_size_sectors = |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 289 | limits->logical_block_size >> SECTOR_SHIFT; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 290 | char b[BDEVNAME_SIZE]; |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 291 | |
Milan Broz | f4808ca | 2011-05-29 13:02:52 +0100 | [diff] [blame] | 292 | /* |
| 293 | * Some devices exist without request functions, |
| 294 | * such as loop devices not yet bound to backing files. |
| 295 | * Forbid the use of such devices. |
| 296 | */ |
| 297 | q = bdev_get_queue(bdev); |
| 298 | if (!q || !q->make_request_fn) { |
| 299 | DMWARN("%s: %s is not yet initialised: " |
| 300 | "start=%llu, len=%llu, dev_size=%llu", |
| 301 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 302 | (unsigned long long)start, |
| 303 | (unsigned long long)len, |
| 304 | (unsigned long long)dev_size); |
| 305 | return 1; |
| 306 | } |
| 307 | |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 308 | if (!dev_size) |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 309 | return 0; |
Mike Anderson | 2cd54d9 | 2007-05-09 02:32:57 -0700 | [diff] [blame] | 310 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 311 | if ((start >= dev_size) || (start + len > dev_size)) { |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 312 | DMWARN("%s: %s too small for target: " |
| 313 | "start=%llu, len=%llu, dev_size=%llu", |
| 314 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 315 | (unsigned long long)start, |
| 316 | (unsigned long long)len, |
| 317 | (unsigned long long)dev_size); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 318 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | if (logical_block_size_sectors <= 1) |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 322 | return 0; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 323 | |
| 324 | if (start & (logical_block_size_sectors - 1)) { |
| 325 | DMWARN("%s: start=%llu not aligned to h/w " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 326 | "logical block size %u of %s", |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 327 | dm_device_name(ti->table->md), |
| 328 | (unsigned long long)start, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 329 | limits->logical_block_size, bdevname(bdev, b)); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 330 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 331 | } |
| 332 | |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 333 | if (len & (logical_block_size_sectors - 1)) { |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 334 | DMWARN("%s: len=%llu not aligned to h/w " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 335 | "logical block size %u of %s", |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 336 | dm_device_name(ti->table->md), |
Mike Snitzer | 5dea271 | 2009-07-23 20:30:42 +0100 | [diff] [blame] | 337 | (unsigned long long)len, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 338 | limits->logical_block_size, bdevname(bdev, b)); |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 339 | return 1; |
Mike Snitzer | 02acc3a | 2009-06-22 10:12:30 +0100 | [diff] [blame] | 340 | } |
| 341 | |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 342 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /* |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 346 | * This upgrades the mode on an already open dm_dev, being |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | * 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] | 348 | * device and not to touch the existing bdev field in case |
| 349 | * it is accessed concurrently inside dm_table_any_congested(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | */ |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 351 | 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] | 352 | struct mapped_device *md) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
| 354 | int r; |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 355 | struct dm_dev *old_dev, *new_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 357 | old_dev = dd->dm_dev; |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 358 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 359 | r = dm_get_table_device(md, dd->dm_dev->bdev->bd_dev, |
| 360 | dd->dm_dev->mode | new_mode, &new_dev); |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 361 | if (r) |
| 362 | return r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 364 | dd->dm_dev = new_dev; |
| 365 | dm_put_table_device(md, old_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Alasdair G Kergon | 570b9d9 | 2009-04-02 19:55:28 +0100 | [diff] [blame] | 367 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | /* |
DingXiang | 4df2bf4 | 2016-02-02 12:29:18 +0800 | [diff] [blame] | 371 | * Convert the path to a device |
| 372 | */ |
| 373 | dev_t dm_get_dev_t(const char *path) |
| 374 | { |
| 375 | dev_t uninitialized_var(dev); |
| 376 | struct block_device *bdev; |
| 377 | |
| 378 | bdev = lookup_bdev(path); |
| 379 | if (IS_ERR(bdev)) |
| 380 | dev = name_to_dev_t(path); |
| 381 | else { |
| 382 | dev = bdev->bd_dev; |
| 383 | bdput(bdev); |
| 384 | } |
| 385 | |
| 386 | return dev; |
| 387 | } |
| 388 | EXPORT_SYMBOL_GPL(dm_get_dev_t); |
| 389 | |
| 390 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | * Add a device to the list, or just increment the usage count if |
| 392 | * it's already present. |
| 393 | */ |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 394 | int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, |
| 395 | struct dm_dev **result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | { |
| 397 | int r; |
DingXiang | 4df2bf4 | 2016-02-02 12:29:18 +0800 | [diff] [blame] | 398 | dev_t dev; |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 399 | struct dm_dev_internal *dd; |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 400 | struct dm_table *t = ti->table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Eric Sesterhenn | 547bc92 | 2006-03-26 18:22:50 +0200 | [diff] [blame] | 402 | BUG_ON(!t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
DingXiang | 4df2bf4 | 2016-02-02 12:29:18 +0800 | [diff] [blame] | 404 | dev = dm_get_dev_t(path); |
| 405 | if (!dev) |
| 406 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | dd = find_device(&t->devices, dev); |
| 409 | if (!dd) { |
| 410 | dd = kmalloc(sizeof(*dd), GFP_KERNEL); |
| 411 | if (!dd) |
| 412 | return -ENOMEM; |
| 413 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 414 | if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | kfree(dd); |
| 416 | return r; |
| 417 | } |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | atomic_set(&dd->count, 0); |
| 420 | list_add(&dd->list, &t->devices); |
| 421 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 422 | } else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) { |
Jun'ichi Nomura | f165921 | 2006-03-27 01:17:59 -0800 | [diff] [blame] | 423 | r = upgrade_mode(dd, mode, t->md); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | if (r) |
| 425 | return r; |
| 426 | } |
| 427 | atomic_inc(&dd->count); |
| 428 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 429 | *result = dd->dm_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return 0; |
| 431 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 432 | EXPORT_SYMBOL(dm_get_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Mike Snitzer | 11f0431 | 2014-06-03 10:30:28 -0400 | [diff] [blame] | 434 | static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev, |
| 435 | sector_t start, sector_t len, void *data) |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 436 | { |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 437 | struct queue_limits *limits = data; |
| 438 | struct block_device *bdev = dev->bdev; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 439 | struct request_queue *q = bdev_get_queue(bdev); |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 440 | char b[BDEVNAME_SIZE]; |
| 441 | |
| 442 | if (unlikely(!q)) { |
| 443 | DMWARN("%s: Cannot set limits for nonexistent device %s", |
| 444 | dm_device_name(ti->table->md), bdevname(bdev, b)); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 445 | return 0; |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 446 | } |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 447 | |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 448 | if (bdev_stack_limits(limits, bdev, start) < 0) |
| 449 | DMWARN("%s: adding target device %s caused an alignment inconsistency: " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 450 | "physical_block_size=%u, logical_block_size=%u, " |
| 451 | "alignment_offset=%u, start=%llu", |
| 452 | dm_device_name(ti->table->md), bdevname(bdev, b), |
| 453 | q->limits.physical_block_size, |
| 454 | q->limits.logical_block_size, |
| 455 | q->limits.alignment_offset, |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 456 | (unsigned long long) start << SECTOR_SHIFT); |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 457 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 458 | return 0; |
Bryn Reeves | 3cb4021 | 2006-10-03 01:15:42 -0700 | [diff] [blame] | 459 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | /* |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 462 | * Decrement a device's use count and remove it if necessary. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | */ |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 464 | void dm_put_device(struct dm_target *ti, struct dm_dev *d) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 466 | int found = 0; |
| 467 | struct list_head *devices = &ti->table->devices; |
| 468 | struct dm_dev_internal *dd; |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 469 | |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 470 | list_for_each_entry(dd, devices, list) { |
| 471 | if (dd->dm_dev == d) { |
| 472 | found = 1; |
| 473 | break; |
| 474 | } |
| 475 | } |
| 476 | if (!found) { |
| 477 | DMWARN("%s: device %s not in table devices list", |
| 478 | dm_device_name(ti->table->md), d->name); |
| 479 | return; |
| 480 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | if (atomic_dec_and_test(&dd->count)) { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 482 | dm_put_table_device(ti->table->md, d); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | list_del(&dd->list); |
| 484 | kfree(dd); |
| 485 | } |
| 486 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 487 | EXPORT_SYMBOL(dm_put_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | /* |
| 490 | * Checks to see if the target joins onto the end of the table. |
| 491 | */ |
| 492 | static int adjoin(struct dm_table *table, struct dm_target *ti) |
| 493 | { |
| 494 | struct dm_target *prev; |
| 495 | |
| 496 | if (!table->num_targets) |
| 497 | return !ti->begin; |
| 498 | |
| 499 | prev = &table->targets[table->num_targets - 1]; |
| 500 | return (ti->begin == (prev->begin + prev->len)); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Used to dynamically allocate the arg array. |
Mikulas Patocka | f36afb3 | 2013-10-31 13:55:45 -0400 | [diff] [blame] | 505 | * |
| 506 | * We do first allocation with GFP_NOIO because dm-mpath and dm-thin must |
| 507 | * process messages even if some device is suspended. These messages have a |
| 508 | * small fixed number of arguments. |
| 509 | * |
| 510 | * On the other hand, dm-switch needs to process bulk data using messages and |
| 511 | * excessive use of GFP_NOIO could cause trouble. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | */ |
| 513 | static char **realloc_argv(unsigned *array_size, char **old_argv) |
| 514 | { |
| 515 | char **argv; |
| 516 | unsigned new_size; |
Mikulas Patocka | f36afb3 | 2013-10-31 13:55:45 -0400 | [diff] [blame] | 517 | gfp_t gfp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Mikulas Patocka | f36afb3 | 2013-10-31 13:55:45 -0400 | [diff] [blame] | 519 | if (*array_size) { |
| 520 | new_size = *array_size * 2; |
| 521 | gfp = GFP_KERNEL; |
| 522 | } else { |
| 523 | new_size = 8; |
| 524 | gfp = GFP_NOIO; |
| 525 | } |
| 526 | argv = kmalloc(new_size * sizeof(*argv), gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | if (argv) { |
| 528 | memcpy(argv, old_argv, *array_size * sizeof(*argv)); |
| 529 | *array_size = new_size; |
| 530 | } |
| 531 | |
| 532 | kfree(old_argv); |
| 533 | return argv; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Destructively splits up the argument list to pass to ctr. |
| 538 | */ |
| 539 | int dm_split_args(int *argc, char ***argvp, char *input) |
| 540 | { |
| 541 | char *start, *end = input, *out, **argv = NULL; |
| 542 | unsigned array_size = 0; |
| 543 | |
| 544 | *argc = 0; |
David Teigland | 814d686 | 2006-06-26 00:27:31 -0700 | [diff] [blame] | 545 | |
| 546 | if (!input) { |
| 547 | *argvp = NULL; |
| 548 | return 0; |
| 549 | } |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | argv = realloc_argv(&array_size, argv); |
| 552 | if (!argv) |
| 553 | return -ENOMEM; |
| 554 | |
| 555 | while (1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | /* Skip whitespace */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 557 | start = skip_spaces(end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
| 559 | if (!*start) |
| 560 | break; /* success, we hit the end */ |
| 561 | |
| 562 | /* 'out' is used to remove any back-quotes */ |
| 563 | end = out = start; |
| 564 | while (*end) { |
| 565 | /* Everything apart from '\0' can be quoted */ |
| 566 | if (*end == '\\' && *(end + 1)) { |
| 567 | *out++ = *(end + 1); |
| 568 | end += 2; |
| 569 | continue; |
| 570 | } |
| 571 | |
| 572 | if (isspace(*end)) |
| 573 | break; /* end of token */ |
| 574 | |
| 575 | *out++ = *end++; |
| 576 | } |
| 577 | |
| 578 | /* have we already filled the array ? */ |
| 579 | if ((*argc + 1) > array_size) { |
| 580 | argv = realloc_argv(&array_size, argv); |
| 581 | if (!argv) |
| 582 | return -ENOMEM; |
| 583 | } |
| 584 | |
| 585 | /* we know this is whitespace */ |
| 586 | if (*end) |
| 587 | end++; |
| 588 | |
| 589 | /* terminate the string and put it in the array */ |
| 590 | *out = '\0'; |
| 591 | argv[*argc] = start; |
| 592 | (*argc)++; |
| 593 | } |
| 594 | |
| 595 | *argvp = argv; |
| 596 | return 0; |
| 597 | } |
| 598 | |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 599 | /* |
| 600 | * Impose necessary and sufficient conditions on a devices's table such |
| 601 | * that any incoming bio which respects its logical_block_size can be |
| 602 | * processed successfully. If it falls across the boundary between |
| 603 | * two or more targets, the size of each piece it gets split into must |
| 604 | * be compatible with the logical_block_size of the target processing it. |
| 605 | */ |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 606 | static int validate_hardware_logical_block_alignment(struct dm_table *table, |
| 607 | struct queue_limits *limits) |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 608 | { |
| 609 | /* |
| 610 | * This function uses arithmetic modulo the logical_block_size |
| 611 | * (in units of 512-byte sectors). |
| 612 | */ |
| 613 | unsigned short device_logical_block_size_sects = |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 614 | limits->logical_block_size >> SECTOR_SHIFT; |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 615 | |
| 616 | /* |
| 617 | * Offset of the start of the next table entry, mod logical_block_size. |
| 618 | */ |
| 619 | unsigned short next_target_start = 0; |
| 620 | |
| 621 | /* |
| 622 | * Given an aligned bio that extends beyond the end of a |
| 623 | * target, how many sectors must the next target handle? |
| 624 | */ |
| 625 | unsigned short remaining = 0; |
| 626 | |
| 627 | struct dm_target *uninitialized_var(ti); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 628 | struct queue_limits ti_limits; |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 629 | unsigned i = 0; |
| 630 | |
| 631 | /* |
| 632 | * Check each entry in the table in turn. |
| 633 | */ |
| 634 | while (i < dm_table_get_num_targets(table)) { |
| 635 | ti = dm_table_get_target(table, i++); |
| 636 | |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 637 | blk_set_stacking_limits(&ti_limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 638 | |
| 639 | /* combine all target devices' limits */ |
| 640 | if (ti->type->iterate_devices) |
| 641 | ti->type->iterate_devices(ti, dm_set_device_limits, |
| 642 | &ti_limits); |
| 643 | |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 644 | /* |
| 645 | * If the remaining sectors fall entirely within this |
| 646 | * table entry are they compatible with its logical_block_size? |
| 647 | */ |
| 648 | if (remaining < ti->len && |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 649 | remaining & ((ti_limits.logical_block_size >> |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 650 | SECTOR_SHIFT) - 1)) |
| 651 | break; /* Error */ |
| 652 | |
| 653 | next_target_start = |
| 654 | (unsigned short) ((next_target_start + ti->len) & |
| 655 | (device_logical_block_size_sects - 1)); |
| 656 | remaining = next_target_start ? |
| 657 | device_logical_block_size_sects - next_target_start : 0; |
| 658 | } |
| 659 | |
| 660 | if (remaining) { |
| 661 | DMWARN("%s: table line %u (start sect %llu len %llu) " |
Mike Snitzer | a963a95 | 2009-09-04 20:40:24 +0100 | [diff] [blame] | 662 | "not aligned to h/w logical block size %u", |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 663 | dm_device_name(table->md), i, |
| 664 | (unsigned long long) ti->begin, |
| 665 | (unsigned long long) ti->len, |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 666 | limits->logical_block_size); |
Mike Snitzer | be6d430 | 2009-06-22 10:12:31 +0100 | [diff] [blame] | 667 | return -EINVAL; |
| 668 | } |
| 669 | |
| 670 | return 0; |
| 671 | } |
| 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | int dm_table_add_target(struct dm_table *t, const char *type, |
| 674 | sector_t start, sector_t len, char *params) |
| 675 | { |
| 676 | int r = -EINVAL, argc; |
| 677 | char **argv; |
| 678 | struct dm_target *tgt; |
| 679 | |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 680 | if (t->singleton) { |
| 681 | DMERR("%s: target type %s must appear alone in table", |
| 682 | dm_device_name(t->md), t->targets->type->name); |
| 683 | return -EINVAL; |
| 684 | } |
| 685 | |
Mikulas Patocka | 57a2f23 | 2013-11-22 19:51:39 -0500 | [diff] [blame] | 686 | BUG_ON(t->num_targets >= t->num_allocated); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | tgt = t->targets + t->num_targets; |
| 689 | memset(tgt, 0, sizeof(*tgt)); |
| 690 | |
| 691 | if (!len) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 692 | DMERR("%s: zero-length target", dm_device_name(t->md)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | return -EINVAL; |
| 694 | } |
| 695 | |
| 696 | tgt->type = dm_get_target_type(type); |
| 697 | if (!tgt->type) { |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 698 | DMERR("%s: %s: unknown target type", dm_device_name(t->md), |
| 699 | type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | return -EINVAL; |
| 701 | } |
| 702 | |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 703 | if (dm_target_needs_singleton(tgt->type)) { |
| 704 | if (t->num_targets) { |
| 705 | DMERR("%s: target type %s must appear alone in table", |
| 706 | dm_device_name(t->md), type); |
| 707 | return -EINVAL; |
| 708 | } |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 709 | t->singleton = true; |
Alasdair G Kergon | 3791e2f | 2011-10-31 20:19:00 +0000 | [diff] [blame] | 710 | } |
| 711 | |
Alasdair G Kergon | cc6cbe1 | 2011-10-31 20:19:02 +0000 | [diff] [blame] | 712 | if (dm_target_always_writeable(tgt->type) && !(t->mode & FMODE_WRITE)) { |
| 713 | DMERR("%s: target type %s may not be included in read-only tables", |
| 714 | dm_device_name(t->md), type); |
| 715 | return -EINVAL; |
| 716 | } |
| 717 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 718 | if (t->immutable_target_type) { |
| 719 | if (t->immutable_target_type != tgt->type) { |
| 720 | DMERR("%s: immutable target type %s cannot be mixed with other target types", |
| 721 | dm_device_name(t->md), t->immutable_target_type->name); |
| 722 | return -EINVAL; |
| 723 | } |
| 724 | } else if (dm_target_is_immutable(tgt->type)) { |
| 725 | if (t->num_targets) { |
| 726 | DMERR("%s: immutable target type %s cannot be mixed with other target types", |
| 727 | dm_device_name(t->md), tgt->type->name); |
| 728 | return -EINVAL; |
| 729 | } |
| 730 | t->immutable_target_type = tgt->type; |
| 731 | } |
| 732 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | tgt->table = t; |
| 734 | tgt->begin = start; |
| 735 | tgt->len = len; |
| 736 | tgt->error = "Unknown error"; |
| 737 | |
| 738 | /* |
| 739 | * Does this target adjoin the previous one ? |
| 740 | */ |
| 741 | if (!adjoin(t, tgt)) { |
| 742 | tgt->error = "Gap in table"; |
| 743 | r = -EINVAL; |
| 744 | goto bad; |
| 745 | } |
| 746 | |
| 747 | r = dm_split_args(&argc, &argv, params); |
| 748 | if (r) { |
| 749 | tgt->error = "couldn't split parameters (insufficient memory)"; |
| 750 | goto bad; |
| 751 | } |
| 752 | |
| 753 | r = tgt->type->ctr(tgt, argc, argv); |
| 754 | kfree(argv); |
| 755 | if (r) |
| 756 | goto bad; |
| 757 | |
| 758 | t->highs[t->num_targets++] = tgt->begin + tgt->len - 1; |
| 759 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 760 | if (!tgt->num_discard_bios && tgt->discards_supported) |
| 761 | DMWARN("%s: %s: ignoring discards_supported because num_discard_bios is zero.", |
Mike Snitzer | 936688d | 2011-08-02 12:32:01 +0100 | [diff] [blame] | 762 | dm_device_name(t->md), type); |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 763 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | return 0; |
| 765 | |
| 766 | bad: |
Alasdair G Kergon | 72d9486 | 2006-06-26 00:27:35 -0700 | [diff] [blame] | 767 | DMERR("%s: %s: %s", dm_device_name(t->md), type, tgt->error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | dm_put_target_type(tgt->type); |
| 769 | return r; |
| 770 | } |
| 771 | |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 772 | /* |
| 773 | * Target argument parsing helpers. |
| 774 | */ |
| 775 | static int validate_next_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 776 | unsigned *value, char **error, unsigned grouped) |
| 777 | { |
| 778 | const char *arg_str = dm_shift_arg(arg_set); |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 779 | char dummy; |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 780 | |
| 781 | if (!arg_str || |
Mikulas Patocka | 31998ef | 2012-03-28 18:41:26 +0100 | [diff] [blame] | 782 | (sscanf(arg_str, "%u%c", value, &dummy) != 1) || |
Mike Snitzer | 498f010 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 783 | (*value < arg->min) || |
| 784 | (*value > arg->max) || |
| 785 | (grouped && arg_set->argc < *value)) { |
| 786 | *error = arg->error; |
| 787 | return -EINVAL; |
| 788 | } |
| 789 | |
| 790 | return 0; |
| 791 | } |
| 792 | |
| 793 | int dm_read_arg(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 794 | unsigned *value, char **error) |
| 795 | { |
| 796 | return validate_next_arg(arg, arg_set, value, error, 0); |
| 797 | } |
| 798 | EXPORT_SYMBOL(dm_read_arg); |
| 799 | |
| 800 | int dm_read_arg_group(struct dm_arg *arg, struct dm_arg_set *arg_set, |
| 801 | unsigned *value, char **error) |
| 802 | { |
| 803 | return validate_next_arg(arg, arg_set, value, error, 1); |
| 804 | } |
| 805 | EXPORT_SYMBOL(dm_read_arg_group); |
| 806 | |
| 807 | const char *dm_shift_arg(struct dm_arg_set *as) |
| 808 | { |
| 809 | char *r; |
| 810 | |
| 811 | if (as->argc) { |
| 812 | as->argc--; |
| 813 | r = *as->argv; |
| 814 | as->argv++; |
| 815 | return r; |
| 816 | } |
| 817 | |
| 818 | return NULL; |
| 819 | } |
| 820 | EXPORT_SYMBOL(dm_shift_arg); |
| 821 | |
| 822 | void dm_consume_args(struct dm_arg_set *as, unsigned num_args) |
| 823 | { |
| 824 | BUG_ON(as->argc < num_args); |
| 825 | as->argc -= num_args; |
| 826 | as->argv += num_args; |
| 827 | } |
| 828 | EXPORT_SYMBOL(dm_consume_args); |
| 829 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 830 | static bool __table_type_bio_based(unsigned table_type) |
| 831 | { |
| 832 | return (table_type == DM_TYPE_BIO_BASED || |
| 833 | table_type == DM_TYPE_DAX_BIO_BASED); |
| 834 | } |
| 835 | |
Junichi Nomura | 15b94a6 | 2015-05-29 08:51:03 +0000 | [diff] [blame] | 836 | static bool __table_type_request_based(unsigned table_type) |
| 837 | { |
| 838 | return (table_type == DM_TYPE_REQUEST_BASED || |
| 839 | table_type == DM_TYPE_MQ_REQUEST_BASED); |
| 840 | } |
| 841 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 842 | void dm_table_set_type(struct dm_table *t, unsigned type) |
| 843 | { |
| 844 | t->type = type; |
| 845 | } |
| 846 | EXPORT_SYMBOL_GPL(dm_table_set_type); |
| 847 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 848 | static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev, |
| 849 | sector_t start, sector_t len, void *data) |
| 850 | { |
| 851 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 852 | |
| 853 | return q && blk_queue_dax(q); |
| 854 | } |
| 855 | |
| 856 | static bool dm_table_supports_dax(struct dm_table *t) |
| 857 | { |
| 858 | struct dm_target *ti; |
| 859 | unsigned i = 0; |
| 860 | |
| 861 | /* Ensure that all targets support DAX. */ |
| 862 | while (i < dm_table_get_num_targets(t)) { |
| 863 | ti = dm_table_get_target(t, i++); |
| 864 | |
| 865 | if (!ti->type->direct_access) |
| 866 | return false; |
| 867 | |
| 868 | if (!ti->type->iterate_devices || |
| 869 | !ti->type->iterate_devices(ti, device_supports_dax, NULL)) |
| 870 | return false; |
| 871 | } |
| 872 | |
| 873 | return true; |
| 874 | } |
| 875 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 876 | static int dm_table_determine_type(struct dm_table *t) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 877 | { |
| 878 | unsigned i; |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 879 | unsigned bio_based = 0, request_based = 0, hybrid = 0; |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 880 | bool verify_blk_mq = false; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 881 | struct dm_target *tgt; |
| 882 | struct dm_dev_internal *dd; |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 883 | struct list_head *devices = dm_table_get_devices(t); |
Mike Snitzer | 65803c2 | 2014-12-18 16:26:47 -0500 | [diff] [blame] | 884 | unsigned live_md_type = dm_get_md_type(t->md); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 885 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 886 | if (t->type != DM_TYPE_NONE) { |
| 887 | /* target already set the table's type */ |
| 888 | if (t->type == DM_TYPE_BIO_BASED) |
| 889 | return 0; |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 890 | BUG_ON(t->type == DM_TYPE_DAX_BIO_BASED); |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 891 | goto verify_rq_based; |
| 892 | } |
| 893 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 894 | for (i = 0; i < t->num_targets; i++) { |
| 895 | tgt = t->targets + i; |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 896 | if (dm_target_hybrid(tgt)) |
| 897 | hybrid = 1; |
| 898 | else if (dm_target_request_based(tgt)) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 899 | request_based = 1; |
| 900 | else |
| 901 | bio_based = 1; |
| 902 | |
| 903 | if (bio_based && request_based) { |
| 904 | DMWARN("Inconsistent table: different target types" |
| 905 | " can't be mixed up"); |
| 906 | return -EINVAL; |
| 907 | } |
| 908 | } |
| 909 | |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 910 | if (hybrid && !bio_based && !request_based) { |
| 911 | /* |
| 912 | * The targets can work either way. |
| 913 | * Determine the type from the live device. |
| 914 | * Default to bio-based if device is new. |
| 915 | */ |
Junichi Nomura | 15b94a6 | 2015-05-29 08:51:03 +0000 | [diff] [blame] | 916 | if (__table_type_request_based(live_md_type)) |
Mike Snitzer | 169e2cc | 2013-08-22 18:21:38 -0400 | [diff] [blame] | 917 | request_based = 1; |
| 918 | else |
| 919 | bio_based = 1; |
| 920 | } |
| 921 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 922 | if (bio_based) { |
| 923 | /* We must use this table as bio-based */ |
| 924 | t->type = DM_TYPE_BIO_BASED; |
Mike Snitzer | f8df1fd | 2016-06-24 17:09:35 -0400 | [diff] [blame] | 925 | if (dm_table_supports_dax(t) || |
| 926 | (list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 927 | t->type = DM_TYPE_DAX_BIO_BASED; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 928 | return 0; |
| 929 | } |
| 930 | |
| 931 | BUG_ON(!request_based); /* No targets in this table */ |
| 932 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 933 | if (list_empty(devices) && __table_type_request_based(live_md_type)) { |
| 934 | /* inherit live MD type */ |
| 935 | t->type = live_md_type; |
| 936 | return 0; |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * The only way to establish DM_TYPE_MQ_REQUEST_BASED is by |
| 941 | * having a compatible target use dm_table_set_type. |
| 942 | */ |
| 943 | t->type = DM_TYPE_REQUEST_BASED; |
| 944 | |
| 945 | verify_rq_based: |
Mike Snitzer | 65803c2 | 2014-12-18 16:26:47 -0500 | [diff] [blame] | 946 | /* |
| 947 | * Request-based dm supports only tables that have a single target now. |
| 948 | * To support multiple targets, request splitting support is needed, |
| 949 | * and that needs lots of changes in the block-layer. |
| 950 | * (e.g. request completion process for partial completion.) |
| 951 | */ |
| 952 | if (t->num_targets > 1) { |
| 953 | DMWARN("Request-based dm doesn't support multiple targets yet"); |
| 954 | return -EINVAL; |
| 955 | } |
| 956 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 957 | /* Non-request-stackable devices can't be used for request-based dm */ |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 958 | list_for_each_entry(dd, devices, list) { |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 959 | struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); |
| 960 | |
| 961 | if (!blk_queue_stackable(q)) { |
| 962 | DMERR("table load rejected: including" |
| 963 | " non-request-stackable devices"); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 964 | return -EINVAL; |
| 965 | } |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 966 | |
| 967 | if (q->mq_ops) |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 968 | verify_blk_mq = true; |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 969 | } |
| 970 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 971 | if (verify_blk_mq) { |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 972 | /* verify _all_ devices in the table are blk-mq devices */ |
| 973 | list_for_each_entry(dd, devices, list) |
| 974 | if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) { |
| 975 | DMERR("table load rejected: not all devices" |
| 976 | " are blk-mq request-stackable"); |
| 977 | return -EINVAL; |
| 978 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 979 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 980 | t->all_blk_mq = true; |
| 981 | } |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 982 | |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | unsigned dm_table_get_type(struct dm_table *t) |
| 987 | { |
| 988 | return t->type; |
| 989 | } |
| 990 | |
Alasdair G Kergon | 36a0456 | 2011-10-31 20:19:04 +0000 | [diff] [blame] | 991 | struct target_type *dm_table_get_immutable_target_type(struct dm_table *t) |
| 992 | { |
| 993 | return t->immutable_target_type; |
| 994 | } |
| 995 | |
Mike Snitzer | 16f1226 | 2016-01-31 17:22:27 -0500 | [diff] [blame] | 996 | struct dm_target *dm_table_get_immutable_target(struct dm_table *t) |
| 997 | { |
| 998 | /* Immutable target is implicitly a singleton */ |
| 999 | if (t->num_targets > 1 || |
| 1000 | !dm_target_is_immutable(t->targets[0].type)) |
| 1001 | return NULL; |
| 1002 | |
| 1003 | return t->targets; |
| 1004 | } |
| 1005 | |
Mike Snitzer | f083b09 | 2016-02-06 18:38:46 -0500 | [diff] [blame] | 1006 | struct dm_target *dm_table_get_wildcard_target(struct dm_table *t) |
| 1007 | { |
| 1008 | struct dm_target *uninitialized_var(ti); |
| 1009 | unsigned i = 0; |
| 1010 | |
| 1011 | while (i < dm_table_get_num_targets(t)) { |
| 1012 | ti = dm_table_get_target(t, i++); |
| 1013 | if (dm_target_is_wildcard(ti->type)) |
| 1014 | return ti; |
| 1015 | } |
| 1016 | |
| 1017 | return NULL; |
| 1018 | } |
| 1019 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1020 | bool dm_table_bio_based(struct dm_table *t) |
| 1021 | { |
| 1022 | return __table_type_bio_based(dm_table_get_type(t)); |
| 1023 | } |
| 1024 | |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1025 | bool dm_table_request_based(struct dm_table *t) |
| 1026 | { |
Junichi Nomura | 15b94a6 | 2015-05-29 08:51:03 +0000 | [diff] [blame] | 1027 | return __table_type_request_based(dm_table_get_type(t)); |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 1028 | } |
| 1029 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1030 | bool dm_table_all_blk_mq_devices(struct dm_table *t) |
Mike Snitzer | e5863d9 | 2014-12-17 21:08:12 -0500 | [diff] [blame] | 1031 | { |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1032 | return t->all_blk_mq; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1033 | } |
| 1034 | |
Mike Snitzer | 17e149b | 2015-03-11 15:01:09 -0400 | [diff] [blame] | 1035 | static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md) |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1036 | { |
| 1037 | unsigned type = dm_table_get_type(t); |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 1038 | unsigned per_io_data_size = 0; |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 1039 | struct dm_target *tgt; |
Mikulas Patocka | c0820cf | 2012-12-21 20:23:38 +0000 | [diff] [blame] | 1040 | unsigned i; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1041 | |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 1042 | if (unlikely(type == DM_TYPE_NONE)) { |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1043 | DMWARN("no table type is set, can't allocate mempools"); |
| 1044 | return -EINVAL; |
| 1045 | } |
| 1046 | |
Toshi Kani | 545ed20 | 2016-06-22 17:54:53 -0600 | [diff] [blame] | 1047 | if (__table_type_bio_based(type)) |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 1048 | for (i = 0; i < t->num_targets; i++) { |
| 1049 | tgt = t->targets + i; |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 1050 | per_io_data_size = max(per_io_data_size, tgt->per_io_data_size); |
Mike Snitzer | 78d8e58 | 2015-06-26 10:01:13 -0400 | [diff] [blame] | 1051 | } |
| 1052 | |
Mike Snitzer | 30187e1 | 2016-01-31 13:28:26 -0500 | [diff] [blame] | 1053 | t->mempools = dm_alloc_md_mempools(md, type, t->integrity_supported, per_io_data_size); |
Mike Snitzer | 4e6e36c | 2015-06-26 09:42:57 -0400 | [diff] [blame] | 1054 | if (!t->mempools) |
| 1055 | return -ENOMEM; |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1056 | |
| 1057 | return 0; |
| 1058 | } |
| 1059 | |
| 1060 | void dm_table_free_md_mempools(struct dm_table *t) |
| 1061 | { |
| 1062 | dm_free_md_mempools(t->mempools); |
| 1063 | t->mempools = NULL; |
| 1064 | } |
| 1065 | |
| 1066 | struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t) |
| 1067 | { |
| 1068 | return t->mempools; |
| 1069 | } |
| 1070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | static int setup_indexes(struct dm_table *t) |
| 1072 | { |
| 1073 | int i; |
| 1074 | unsigned int total = 0; |
| 1075 | sector_t *indexes; |
| 1076 | |
| 1077 | /* allocate the space for *all* the indexes */ |
| 1078 | for (i = t->depth - 2; i >= 0; i--) { |
| 1079 | t->counts[i] = dm_div_up(t->counts[i + 1], CHILDREN_PER_NODE); |
| 1080 | total += t->counts[i]; |
| 1081 | } |
| 1082 | |
| 1083 | indexes = (sector_t *) dm_vcalloc(total, (unsigned long) NODE_SIZE); |
| 1084 | if (!indexes) |
| 1085 | return -ENOMEM; |
| 1086 | |
| 1087 | /* set up internal nodes, bottom-up */ |
Jun'ichi Nomura | 82d601d | 2008-02-08 02:10:04 +0000 | [diff] [blame] | 1088 | for (i = t->depth - 2; i >= 0; i--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | t->index[i] = indexes; |
| 1090 | indexes += (KEYS_PER_NODE * t->counts[i]); |
| 1091 | setup_btree_index(i, t); |
| 1092 | } |
| 1093 | |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * Builds the btree to index the map. |
| 1099 | */ |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1100 | static int dm_table_build_index(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | { |
| 1102 | int r = 0; |
| 1103 | unsigned int leaf_nodes; |
| 1104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | /* how many indexes will the btree have ? */ |
| 1106 | leaf_nodes = dm_div_up(t->num_targets, KEYS_PER_NODE); |
| 1107 | t->depth = 1 + int_log(leaf_nodes, CHILDREN_PER_NODE); |
| 1108 | |
| 1109 | /* leaf layer has already been set up */ |
| 1110 | t->counts[t->depth - 1] = leaf_nodes; |
| 1111 | t->index[t->depth - 1] = t->highs; |
| 1112 | |
| 1113 | if (t->depth >= 2) |
| 1114 | r = setup_indexes(t); |
| 1115 | |
| 1116 | return r; |
| 1117 | } |
| 1118 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1119 | static bool integrity_profile_exists(struct gendisk *disk) |
| 1120 | { |
| 1121 | return !!blk_get_integrity(disk); |
| 1122 | } |
| 1123 | |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1124 | /* |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1125 | * Get a disk whose integrity profile reflects the table's profile. |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1126 | * Returns NULL if integrity support was inconsistent or unavailable. |
| 1127 | */ |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1128 | static struct gendisk * dm_table_get_integrity_disk(struct dm_table *t) |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1129 | { |
| 1130 | struct list_head *devices = dm_table_get_devices(t); |
| 1131 | struct dm_dev_internal *dd = NULL; |
| 1132 | struct gendisk *prev_disk = NULL, *template_disk = NULL; |
| 1133 | |
| 1134 | list_for_each_entry(dd, devices, list) { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1135 | template_disk = dd->dm_dev->bdev->bd_disk; |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1136 | if (!integrity_profile_exists(template_disk)) |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1137 | goto no_integrity; |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1138 | else if (prev_disk && |
| 1139 | blk_integrity_compare(prev_disk, template_disk) < 0) |
| 1140 | goto no_integrity; |
| 1141 | prev_disk = template_disk; |
| 1142 | } |
| 1143 | |
| 1144 | return template_disk; |
| 1145 | |
| 1146 | no_integrity: |
| 1147 | if (prev_disk) |
| 1148 | DMWARN("%s: integrity not set: %s and %s profile mismatch", |
| 1149 | dm_device_name(t->md), |
| 1150 | prev_disk->disk_name, |
| 1151 | template_disk->disk_name); |
| 1152 | return NULL; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1156 | * Register the mapped device for blk_integrity support if the |
| 1157 | * underlying devices have an integrity profile. But all devices may |
| 1158 | * not have matching profiles (checking all devices isn't reliable |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1159 | * during table load because this table may use other DM device(s) which |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1160 | * must be resumed before they will have an initialized integity |
| 1161 | * profile). Consequently, stacked DM devices force a 2 stage integrity |
| 1162 | * profile validation: First pass during table load, final pass during |
| 1163 | * resume. |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1164 | */ |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1165 | static int dm_table_register_integrity(struct dm_table *t) |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1166 | { |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1167 | struct mapped_device *md = t->md; |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1168 | struct gendisk *template_disk = NULL; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1169 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1170 | template_disk = dm_table_get_integrity_disk(t); |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1171 | if (!template_disk) |
| 1172 | return 0; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1173 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1174 | if (!integrity_profile_exists(dm_disk(md))) { |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1175 | t->integrity_supported = true; |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1176 | /* |
| 1177 | * Register integrity profile during table load; we can do |
| 1178 | * this because the final profile must match during resume. |
| 1179 | */ |
| 1180 | blk_integrity_register(dm_disk(md), |
| 1181 | blk_get_integrity(template_disk)); |
| 1182 | return 0; |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | /* |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1186 | * If DM device already has an initialized integrity |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1187 | * profile the new profile should not conflict. |
| 1188 | */ |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1189 | if (blk_integrity_compare(dm_disk(md), template_disk) < 0) { |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1190 | DMWARN("%s: conflict with existing integrity profile: " |
| 1191 | "%s profile mismatch", |
| 1192 | dm_device_name(t->md), |
| 1193 | template_disk->disk_name); |
| 1194 | return 1; |
| 1195 | } |
| 1196 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1197 | /* Preserve existing integrity profile */ |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1198 | t->integrity_supported = true; |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1199 | return 0; |
| 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * Prepares the table for use by building the indices, |
| 1204 | * setting the type, and allocating mempools. |
| 1205 | */ |
| 1206 | int dm_table_complete(struct dm_table *t) |
| 1207 | { |
| 1208 | int r; |
| 1209 | |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1210 | r = dm_table_determine_type(t); |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1211 | if (r) { |
Mike Snitzer | e83068a | 2016-05-24 21:16:51 -0400 | [diff] [blame] | 1212 | DMERR("unable to determine table type"); |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1213 | return r; |
| 1214 | } |
| 1215 | |
| 1216 | r = dm_table_build_index(t); |
| 1217 | if (r) { |
| 1218 | DMERR("unable to build btrees"); |
| 1219 | return r; |
| 1220 | } |
| 1221 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1222 | r = dm_table_register_integrity(t); |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1223 | if (r) { |
| 1224 | DMERR("could not register integrity profile."); |
| 1225 | return r; |
| 1226 | } |
| 1227 | |
Mike Snitzer | 17e149b | 2015-03-11 15:01:09 -0400 | [diff] [blame] | 1228 | r = dm_table_alloc_md_mempools(t, t->md); |
Will Drewry | 26803b9 | 2010-08-12 04:14:03 +0100 | [diff] [blame] | 1229 | if (r) |
| 1230 | DMERR("unable to allocate mempools"); |
| 1231 | |
| 1232 | return r; |
| 1233 | } |
| 1234 | |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1235 | static DEFINE_MUTEX(_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | void dm_table_event_callback(struct dm_table *t, |
| 1237 | void (*fn)(void *), void *context) |
| 1238 | { |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1239 | mutex_lock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | t->event_fn = fn; |
| 1241 | t->event_context = context; |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1242 | mutex_unlock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | void dm_table_event(struct dm_table *t) |
| 1246 | { |
| 1247 | /* |
| 1248 | * You can no longer call dm_table_event() from interrupt |
| 1249 | * context, use a bottom half instead. |
| 1250 | */ |
| 1251 | BUG_ON(in_interrupt()); |
| 1252 | |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1253 | mutex_lock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | if (t->event_fn) |
| 1255 | t->event_fn(t->event_context); |
Arjan van de Ven | 48c9c27 | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 1256 | mutex_unlock(&_event_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1258 | EXPORT_SYMBOL(dm_table_event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
| 1260 | sector_t dm_table_get_size(struct dm_table *t) |
| 1261 | { |
| 1262 | return t->num_targets ? (t->highs[t->num_targets - 1] + 1) : 0; |
| 1263 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1264 | EXPORT_SYMBOL(dm_table_get_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | |
| 1266 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) |
| 1267 | { |
Milan Broz | 1435353 | 2006-06-26 00:27:27 -0700 | [diff] [blame] | 1268 | if (index >= t->num_targets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | return NULL; |
| 1270 | |
| 1271 | return t->targets + index; |
| 1272 | } |
| 1273 | |
| 1274 | /* |
| 1275 | * Search the btree for the correct target. |
Jun'ichi Nomura | 512875b | 2007-12-13 14:15:25 +0000 | [diff] [blame] | 1276 | * |
| 1277 | * Caller should check returned pointer with dm_target_is_valid() |
| 1278 | * to trap I/O beyond end of device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | */ |
| 1280 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) |
| 1281 | { |
| 1282 | unsigned int l, n = 0, k = 0; |
| 1283 | sector_t *node; |
| 1284 | |
| 1285 | for (l = 0; l < t->depth; l++) { |
| 1286 | n = get_child(n, k); |
| 1287 | node = get_node(t, l, n); |
| 1288 | |
| 1289 | for (k = 0; k < KEYS_PER_NODE; k++) |
| 1290 | if (node[k] >= sector) |
| 1291 | break; |
| 1292 | } |
| 1293 | |
| 1294 | return &t->targets[(KEYS_PER_NODE * n) + k]; |
| 1295 | } |
| 1296 | |
Mike Snitzer | 3ae7065 | 2012-09-26 23:45:45 +0100 | [diff] [blame] | 1297 | static int count_device(struct dm_target *ti, struct dm_dev *dev, |
| 1298 | sector_t start, sector_t len, void *data) |
| 1299 | { |
| 1300 | unsigned *num_devices = data; |
| 1301 | |
| 1302 | (*num_devices)++; |
| 1303 | |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | /* |
| 1308 | * Check whether a table has no data devices attached using each |
| 1309 | * target's iterate_devices method. |
| 1310 | * Returns false if the result is unknown because a target doesn't |
| 1311 | * support iterate_devices. |
| 1312 | */ |
| 1313 | bool dm_table_has_no_data_devices(struct dm_table *table) |
| 1314 | { |
| 1315 | struct dm_target *uninitialized_var(ti); |
| 1316 | unsigned i = 0, num_devices = 0; |
| 1317 | |
| 1318 | while (i < dm_table_get_num_targets(table)) { |
| 1319 | ti = dm_table_get_target(table, i++); |
| 1320 | |
| 1321 | if (!ti->type->iterate_devices) |
| 1322 | return false; |
| 1323 | |
| 1324 | ti->type->iterate_devices(ti, count_device, &num_devices); |
| 1325 | if (num_devices) |
| 1326 | return false; |
| 1327 | } |
| 1328 | |
| 1329 | return true; |
| 1330 | } |
| 1331 | |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1332 | /* |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1333 | * Establish the new table's queue_limits and validate them. |
| 1334 | */ |
| 1335 | int dm_calculate_queue_limits(struct dm_table *table, |
| 1336 | struct queue_limits *limits) |
| 1337 | { |
| 1338 | struct dm_target *uninitialized_var(ti); |
| 1339 | struct queue_limits ti_limits; |
| 1340 | unsigned i = 0; |
| 1341 | |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 1342 | blk_set_stacking_limits(limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1343 | |
| 1344 | while (i < dm_table_get_num_targets(table)) { |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 1345 | blk_set_stacking_limits(&ti_limits); |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1346 | |
| 1347 | ti = dm_table_get_target(table, i++); |
| 1348 | |
| 1349 | if (!ti->type->iterate_devices) |
| 1350 | goto combine_limits; |
| 1351 | |
| 1352 | /* |
| 1353 | * Combine queue limits of all the devices this target uses. |
| 1354 | */ |
| 1355 | ti->type->iterate_devices(ti, dm_set_device_limits, |
| 1356 | &ti_limits); |
| 1357 | |
Mike Snitzer | 40bea43 | 2009-09-04 20:40:25 +0100 | [diff] [blame] | 1358 | /* Set I/O hints portion of queue limits */ |
| 1359 | if (ti->type->io_hints) |
| 1360 | ti->type->io_hints(ti, &ti_limits); |
| 1361 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1362 | /* |
| 1363 | * Check each device area is consistent with the target's |
| 1364 | * overall queue limits. |
| 1365 | */ |
Mikulas Patocka | f6a1ed1 | 2009-09-04 20:40:22 +0100 | [diff] [blame] | 1366 | if (ti->type->iterate_devices(ti, device_area_is_invalid, |
| 1367 | &ti_limits)) |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1368 | return -EINVAL; |
| 1369 | |
| 1370 | combine_limits: |
| 1371 | /* |
| 1372 | * Merge this target's queue limits into the overall limits |
| 1373 | * for the table. |
| 1374 | */ |
| 1375 | if (blk_stack_limits(limits, &ti_limits, 0) < 0) |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 1376 | DMWARN("%s: adding target device " |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1377 | "(start sect %llu len %llu) " |
Martin K. Petersen | b27d7f1 | 2010-01-11 03:21:50 -0500 | [diff] [blame] | 1378 | "caused an alignment inconsistency", |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1379 | dm_device_name(table->md), |
| 1380 | (unsigned long long) ti->begin, |
| 1381 | (unsigned long long) ti->len); |
| 1382 | } |
| 1383 | |
| 1384 | return validate_hardware_logical_block_alignment(table, limits); |
| 1385 | } |
| 1386 | |
| 1387 | /* |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1388 | * Verify that all devices have an integrity profile that matches the |
| 1389 | * DM device's registered integrity profile. If the profiles don't |
| 1390 | * match then unregister the DM device's integrity profile. |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1391 | */ |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1392 | static void dm_table_verify_integrity(struct dm_table *t) |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1393 | { |
Mike Snitzer | a63a5cf | 2011-04-01 21:02:31 +0200 | [diff] [blame] | 1394 | struct gendisk *template_disk = NULL; |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1395 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1396 | if (t->integrity_supported) { |
| 1397 | /* |
| 1398 | * Verify that the original integrity profile |
| 1399 | * matches all the devices in this table. |
| 1400 | */ |
| 1401 | template_disk = dm_table_get_integrity_disk(t); |
| 1402 | if (template_disk && |
| 1403 | blk_integrity_compare(dm_disk(t->md), template_disk) >= 0) |
| 1404 | return; |
| 1405 | } |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1406 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1407 | if (integrity_profile_exists(dm_disk(t->md))) { |
Mike Snitzer | 876fbba | 2011-09-25 23:26:17 +0100 | [diff] [blame] | 1408 | DMWARN("%s: unable to establish an integrity profile", |
| 1409 | dm_device_name(t->md)); |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1410 | blk_integrity_unregister(dm_disk(t->md)); |
| 1411 | } |
Martin K. Petersen | 9c47008 | 2009-04-09 00:27:12 +0100 | [diff] [blame] | 1412 | } |
| 1413 | |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1414 | static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1415 | sector_t start, sector_t len, void *data) |
| 1416 | { |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1417 | unsigned long flush = (unsigned long) data; |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1418 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1419 | |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1420 | return q && (q->queue_flags & flush); |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1421 | } |
| 1422 | |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1423 | static bool dm_table_supports_flush(struct dm_table *t, unsigned long flush) |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1424 | { |
| 1425 | struct dm_target *ti; |
| 1426 | unsigned i = 0; |
| 1427 | |
| 1428 | /* |
| 1429 | * Require at least one underlying device to support flushes. |
| 1430 | * t->devices includes internal dm devices such as mirror logs |
| 1431 | * so we need to use iterate_devices here, which targets |
| 1432 | * supporting flushes must provide. |
| 1433 | */ |
| 1434 | while (i < dm_table_get_num_targets(t)) { |
| 1435 | ti = dm_table_get_target(t, i++); |
| 1436 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1437 | if (!ti->num_flush_bios) |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1438 | continue; |
| 1439 | |
Joe Thornber | 0e9c24e | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 1440 | if (ti->flush_supported) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1441 | return true; |
Joe Thornber | 0e9c24e | 2012-07-27 15:08:07 +0100 | [diff] [blame] | 1442 | |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1443 | if (ti->type->iterate_devices && |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1444 | ti->type->iterate_devices(ti, device_flush_capable, (void *) flush)) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1445 | return true; |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1446 | } |
| 1447 | |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1448 | return false; |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1449 | } |
| 1450 | |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1451 | static bool dm_table_discard_zeroes_data(struct dm_table *t) |
| 1452 | { |
| 1453 | struct dm_target *ti; |
| 1454 | unsigned i = 0; |
| 1455 | |
| 1456 | /* Ensure that all targets supports discard_zeroes_data. */ |
| 1457 | while (i < dm_table_get_num_targets(t)) { |
| 1458 | ti = dm_table_get_target(t, i++); |
| 1459 | |
| 1460 | if (ti->discard_zeroes_data_unsupported) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1461 | return false; |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1462 | } |
| 1463 | |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1464 | return true; |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1465 | } |
| 1466 | |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1467 | static int device_is_nonrot(struct dm_target *ti, struct dm_dev *dev, |
| 1468 | sector_t start, sector_t len, void *data) |
| 1469 | { |
| 1470 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1471 | |
| 1472 | return q && blk_queue_nonrot(q); |
| 1473 | } |
| 1474 | |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1475 | static int device_is_not_random(struct dm_target *ti, struct dm_dev *dev, |
| 1476 | sector_t start, sector_t len, void *data) |
| 1477 | { |
| 1478 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1479 | |
| 1480 | return q && !blk_queue_add_random(q); |
| 1481 | } |
| 1482 | |
Jeff Moyer | 200612e | 2014-08-08 11:03:41 -0400 | [diff] [blame] | 1483 | static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev, |
| 1484 | sector_t start, sector_t len, void *data) |
| 1485 | { |
| 1486 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1487 | |
| 1488 | return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags); |
| 1489 | } |
| 1490 | |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1491 | static bool dm_table_all_devices_attribute(struct dm_table *t, |
| 1492 | iterate_devices_callout_fn func) |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1493 | { |
| 1494 | struct dm_target *ti; |
| 1495 | unsigned i = 0; |
| 1496 | |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1497 | while (i < dm_table_get_num_targets(t)) { |
| 1498 | ti = dm_table_get_target(t, i++); |
| 1499 | |
| 1500 | if (!ti->type->iterate_devices || |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1501 | !ti->type->iterate_devices(ti, func, NULL)) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1502 | return false; |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1503 | } |
| 1504 | |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1505 | return true; |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1506 | } |
| 1507 | |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1508 | static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1509 | sector_t start, sector_t len, void *data) |
| 1510 | { |
| 1511 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1512 | |
| 1513 | return q && !q->limits.max_write_same_sectors; |
| 1514 | } |
| 1515 | |
| 1516 | static bool dm_table_supports_write_same(struct dm_table *t) |
| 1517 | { |
| 1518 | struct dm_target *ti; |
| 1519 | unsigned i = 0; |
| 1520 | |
| 1521 | while (i < dm_table_get_num_targets(t)) { |
| 1522 | ti = dm_table_get_target(t, i++); |
| 1523 | |
Alasdair G Kergon | 55a62ee | 2013-03-01 22:45:47 +0000 | [diff] [blame] | 1524 | if (!ti->num_write_same_bios) |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1525 | return false; |
| 1526 | |
| 1527 | if (!ti->type->iterate_devices || |
Mike Snitzer | dc019b2 | 2013-05-10 14:37:16 +0100 | [diff] [blame] | 1528 | ti->type->iterate_devices(ti, device_not_write_same_capable, NULL)) |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1529 | return false; |
| 1530 | } |
| 1531 | |
| 1532 | return true; |
| 1533 | } |
| 1534 | |
Mikulas Patocka | a7ffb6a | 2014-07-10 12:23:07 -0400 | [diff] [blame] | 1535 | static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, |
| 1536 | sector_t start, sector_t len, void *data) |
| 1537 | { |
| 1538 | struct request_queue *q = bdev_get_queue(dev->bdev); |
| 1539 | |
| 1540 | return q && blk_queue_discard(q); |
| 1541 | } |
| 1542 | |
| 1543 | static bool dm_table_supports_discards(struct dm_table *t) |
| 1544 | { |
| 1545 | struct dm_target *ti; |
| 1546 | unsigned i = 0; |
| 1547 | |
| 1548 | /* |
| 1549 | * Unless any target used by the table set discards_supported, |
| 1550 | * require at least one underlying device to support discards. |
| 1551 | * t->devices includes internal dm devices such as mirror logs |
| 1552 | * so we need to use iterate_devices here, which targets |
| 1553 | * supporting discard selectively must provide. |
| 1554 | */ |
| 1555 | while (i < dm_table_get_num_targets(t)) { |
| 1556 | ti = dm_table_get_target(t, i++); |
| 1557 | |
| 1558 | if (!ti->num_discard_bios) |
| 1559 | continue; |
| 1560 | |
| 1561 | if (ti->discards_supported) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1562 | return true; |
Mikulas Patocka | a7ffb6a | 2014-07-10 12:23:07 -0400 | [diff] [blame] | 1563 | |
| 1564 | if (ti->type->iterate_devices && |
| 1565 | ti->type->iterate_devices(ti, device_discard_capable, NULL)) |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1566 | return true; |
Mikulas Patocka | a7ffb6a | 2014-07-10 12:23:07 -0400 | [diff] [blame] | 1567 | } |
| 1568 | |
Joe Perches | 7f61f5a | 2015-03-30 10:43:18 -0700 | [diff] [blame] | 1569 | return false; |
Mikulas Patocka | a7ffb6a | 2014-07-10 12:23:07 -0400 | [diff] [blame] | 1570 | } |
| 1571 | |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1572 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, |
| 1573 | struct queue_limits *limits) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | { |
Jens Axboe | 519a7e1 | 2016-03-30 10:14:14 -0600 | [diff] [blame] | 1575 | bool wc = false, fua = false; |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | /* |
Mike Snitzer | 1197764 | 2009-06-22 10:12:32 +0100 | [diff] [blame] | 1578 | * Copy table's limits to the DM device's request_queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | */ |
Mike Snitzer | 754c5fc | 2009-06-22 10:12:34 +0100 | [diff] [blame] | 1580 | q->limits = *limits; |
Jens Axboe | c9a3f6d | 2008-04-29 19:12:35 +0200 | [diff] [blame] | 1581 | |
Mike Snitzer | 5ae89a8 | 2010-08-12 04:14:08 +0100 | [diff] [blame] | 1582 | if (!dm_table_supports_discards(t)) |
| 1583 | queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q); |
| 1584 | else |
| 1585 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| 1586 | |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1587 | if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) { |
Jens Axboe | 519a7e1 | 2016-03-30 10:14:14 -0600 | [diff] [blame] | 1588 | wc = true; |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 1589 | if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_FUA))) |
Jens Axboe | 519a7e1 | 2016-03-30 10:14:14 -0600 | [diff] [blame] | 1590 | fua = true; |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1591 | } |
Jens Axboe | 519a7e1 | 2016-03-30 10:14:14 -0600 | [diff] [blame] | 1592 | blk_queue_write_cache(q, wc, fua); |
Mike Snitzer | ed8b752 | 2011-08-02 12:32:08 +0100 | [diff] [blame] | 1593 | |
Milan Broz | 983c7db | 2011-09-25 23:26:21 +0100 | [diff] [blame] | 1594 | if (!dm_table_discard_zeroes_data(t)) |
| 1595 | q->limits.discard_zeroes_data = 0; |
| 1596 | |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1597 | /* Ensure that all underlying devices are non-rotational. */ |
| 1598 | if (dm_table_all_devices_attribute(t, device_is_nonrot)) |
Mandeep Singh Baines | 4693c966 | 2011-10-31 20:18:50 +0000 | [diff] [blame] | 1599 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
| 1600 | else |
| 1601 | queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q); |
| 1602 | |
Mike Snitzer | d54eaa5 | 2012-12-21 20:23:36 +0000 | [diff] [blame] | 1603 | if (!dm_table_supports_write_same(t)) |
| 1604 | q->limits.max_write_same_sectors = 0; |
Mike Snitzer | c1a9467 | 2012-12-21 20:23:30 +0000 | [diff] [blame] | 1605 | |
Jeff Moyer | 200612e | 2014-08-08 11:03:41 -0400 | [diff] [blame] | 1606 | if (dm_table_all_devices_attribute(t, queue_supports_sg_merge)) |
| 1607 | queue_flag_clear_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); |
| 1608 | else |
| 1609 | queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q); |
| 1610 | |
Martin K. Petersen | 25520d5 | 2015-10-21 13:19:49 -0400 | [diff] [blame] | 1611 | dm_table_verify_integrity(t); |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1612 | |
| 1613 | /* |
Milan Broz | c3c4555e | 2012-09-26 23:45:43 +0100 | [diff] [blame] | 1614 | * Determine whether or not this queue's I/O timings contribute |
| 1615 | * to the entropy pool, Only request-based targets use this. |
| 1616 | * Clear QUEUE_FLAG_ADD_RANDOM if any underlying device does not |
| 1617 | * have it set. |
| 1618 | */ |
| 1619 | if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random)) |
| 1620 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); |
| 1621 | |
| 1622 | /* |
Kiyoshi Ueda | e6ee8c0 | 2009-06-22 10:12:36 +0100 | [diff] [blame] | 1623 | * QUEUE_FLAG_STACKABLE must be set after all queue settings are |
| 1624 | * visible to other CPUs because, once the flag is set, incoming bios |
| 1625 | * are processed by request-based dm, which refers to the queue |
| 1626 | * settings. |
| 1627 | * Until the flag set, bios are passed to bio-based dm and queued to |
| 1628 | * md->deferred where queue settings are not needed yet. |
| 1629 | * Those bios are passed to request-based dm at the resume time. |
| 1630 | */ |
| 1631 | smp_mb(); |
| 1632 | if (dm_table_request_based(t)) |
| 1633 | queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | } |
| 1635 | |
| 1636 | unsigned int dm_table_get_num_targets(struct dm_table *t) |
| 1637 | { |
| 1638 | return t->num_targets; |
| 1639 | } |
| 1640 | |
| 1641 | struct list_head *dm_table_get_devices(struct dm_table *t) |
| 1642 | { |
| 1643 | return &t->devices; |
| 1644 | } |
| 1645 | |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1646 | fmode_t dm_table_get_mode(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | { |
| 1648 | return t->mode; |
| 1649 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1650 | EXPORT_SYMBOL(dm_table_get_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 1652 | enum suspend_mode { |
| 1653 | PRESUSPEND, |
| 1654 | PRESUSPEND_UNDO, |
| 1655 | POSTSUSPEND, |
| 1656 | }; |
| 1657 | |
| 1658 | static void suspend_targets(struct dm_table *t, enum suspend_mode mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | { |
| 1660 | int i = t->num_targets; |
| 1661 | struct dm_target *ti = t->targets; |
| 1662 | |
| 1663 | while (i--) { |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 1664 | switch (mode) { |
| 1665 | case PRESUSPEND: |
| 1666 | if (ti->type->presuspend) |
| 1667 | ti->type->presuspend(ti); |
| 1668 | break; |
| 1669 | case PRESUSPEND_UNDO: |
| 1670 | if (ti->type->presuspend_undo) |
| 1671 | ti->type->presuspend_undo(ti); |
| 1672 | break; |
| 1673 | case POSTSUSPEND: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | if (ti->type->postsuspend) |
| 1675 | ti->type->postsuspend(ti); |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 1676 | break; |
| 1677 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | ti++; |
| 1679 | } |
| 1680 | } |
| 1681 | |
| 1682 | void dm_table_presuspend_targets(struct dm_table *t) |
| 1683 | { |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1684 | if (!t) |
| 1685 | return; |
| 1686 | |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 1687 | suspend_targets(t, PRESUSPEND); |
| 1688 | } |
| 1689 | |
| 1690 | void dm_table_presuspend_undo_targets(struct dm_table *t) |
| 1691 | { |
| 1692 | if (!t) |
| 1693 | return; |
| 1694 | |
| 1695 | suspend_targets(t, PRESUSPEND_UNDO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
| 1698 | void dm_table_postsuspend_targets(struct dm_table *t) |
| 1699 | { |
Alasdair G Kergon | cf222b3 | 2005-07-28 21:15:57 -0700 | [diff] [blame] | 1700 | if (!t) |
| 1701 | return; |
| 1702 | |
Mike Snitzer | d67ee21 | 2014-10-28 20:13:31 -0400 | [diff] [blame] | 1703 | suspend_targets(t, POSTSUSPEND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | } |
| 1705 | |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1706 | int dm_table_resume_targets(struct dm_table *t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | { |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1708 | int i, r = 0; |
| 1709 | |
| 1710 | for (i = 0; i < t->num_targets; i++) { |
| 1711 | struct dm_target *ti = t->targets + i; |
| 1712 | |
| 1713 | if (!ti->type->preresume) |
| 1714 | continue; |
| 1715 | |
| 1716 | r = ti->type->preresume(ti); |
Mike Snitzer | 7833b08 | 2013-10-24 14:10:29 -0400 | [diff] [blame] | 1717 | if (r) { |
| 1718 | DMERR("%s: %s: preresume failed, error = %d", |
| 1719 | dm_device_name(t->md), ti->type->name, r); |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1720 | return r; |
Mike Snitzer | 7833b08 | 2013-10-24 14:10:29 -0400 | [diff] [blame] | 1721 | } |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1722 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | |
| 1724 | for (i = 0; i < t->num_targets; i++) { |
| 1725 | struct dm_target *ti = t->targets + i; |
| 1726 | |
| 1727 | if (ti->type->resume) |
| 1728 | ti->type->resume(ti); |
| 1729 | } |
Milan Broz | 8757b77 | 2006-10-03 01:15:36 -0700 | [diff] [blame] | 1730 | |
| 1731 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | } |
| 1733 | |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1734 | void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callbacks *cb) |
| 1735 | { |
| 1736 | list_add(&cb->list, &t->target_callbacks); |
| 1737 | } |
| 1738 | EXPORT_SYMBOL_GPL(dm_table_add_target_callbacks); |
| 1739 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | int dm_table_any_congested(struct dm_table *t, int bdi_bits) |
| 1741 | { |
Mikulas Patocka | 82b1519 | 2008-10-10 13:37:09 +0100 | [diff] [blame] | 1742 | struct dm_dev_internal *dd; |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 1743 | struct list_head *devices = dm_table_get_devices(t); |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1744 | struct dm_target_callbacks *cb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | int r = 0; |
| 1746 | |
Paul Jimenez | afb2452 | 2008-02-08 02:09:59 +0000 | [diff] [blame] | 1747 | list_for_each_entry(dd, devices, list) { |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1748 | struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); |
Alasdair G Kergon | 0c2322e | 2008-10-10 13:37:13 +0100 | [diff] [blame] | 1749 | char b[BDEVNAME_SIZE]; |
| 1750 | |
| 1751 | if (likely(q)) |
| 1752 | r |= bdi_congested(&q->backing_dev_info, bdi_bits); |
| 1753 | else |
| 1754 | DMWARN_LIMIT("%s: any_congested: nonexistent device %s", |
| 1755 | dm_device_name(t->md), |
Benjamin Marzinski | 86f1152 | 2014-08-13 13:53:43 -0500 | [diff] [blame] | 1756 | bdevname(dd->dm_dev->bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | } |
| 1758 | |
NeilBrown | 9d357b0 | 2011-01-13 20:00:01 +0000 | [diff] [blame] | 1759 | list_for_each_entry(cb, &t->target_callbacks, list) |
| 1760 | if (cb->congested_fn) |
| 1761 | r |= cb->congested_fn(cb, bdi_bits); |
| 1762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | return r; |
| 1764 | } |
| 1765 | |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1766 | struct mapped_device *dm_table_get_md(struct dm_table *t) |
| 1767 | { |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1768 | return t->md; |
| 1769 | } |
Mike Snitzer | 0864901 | 2011-08-02 12:32:04 +0100 | [diff] [blame] | 1770 | EXPORT_SYMBOL(dm_table_get_md); |
Mike Anderson | 1134e5a | 2006-03-27 01:17:54 -0800 | [diff] [blame] | 1771 | |
Mike Snitzer | 9974fa2 | 2014-02-28 15:33:43 +0100 | [diff] [blame] | 1772 | void dm_table_run_md_queue_async(struct dm_table *t) |
| 1773 | { |
| 1774 | struct mapped_device *md; |
| 1775 | struct request_queue *queue; |
| 1776 | unsigned long flags; |
| 1777 | |
| 1778 | if (!dm_table_request_based(t)) |
| 1779 | return; |
| 1780 | |
| 1781 | md = dm_table_get_md(t); |
| 1782 | queue = dm_get_md_queue(md); |
| 1783 | if (queue) { |
Mike Snitzer | bfebd1c | 2015-03-08 00:51:47 -0500 | [diff] [blame] | 1784 | if (queue->mq_ops) |
| 1785 | blk_mq_run_hw_queues(queue, true); |
| 1786 | else { |
| 1787 | spin_lock_irqsave(queue->queue_lock, flags); |
| 1788 | blk_run_queue_async(queue); |
| 1789 | spin_unlock_irqrestore(queue->queue_lock, flags); |
| 1790 | } |
Mike Snitzer | 9974fa2 | 2014-02-28 15:33:43 +0100 | [diff] [blame] | 1791 | } |
| 1792 | } |
| 1793 | EXPORT_SYMBOL(dm_table_run_md_queue_async); |
| 1794 | |