Dmitry Fomichev | bae9a0a | 2019-08-02 15:02:50 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2017 Western Digital Corporation or its affiliates. |
| 4 | * |
| 5 | * This file is released under the GPL. |
| 6 | */ |
| 7 | |
| 8 | #include "dm-zoned.h" |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/crc32.h> |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 12 | #include <linux/sched/mm.h> |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 13 | |
| 14 | #define DM_MSG_PREFIX "zoned metadata" |
| 15 | |
| 16 | /* |
| 17 | * Metadata version. |
| 18 | */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 19 | #define DMZ_META_VER 2 |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 20 | |
| 21 | /* |
| 22 | * On-disk super block magic. |
| 23 | */ |
| 24 | #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ |
| 25 | (((unsigned int)('Z')) << 16) | \ |
| 26 | (((unsigned int)('B')) << 8) | \ |
| 27 | ((unsigned int)('D'))) |
| 28 | |
| 29 | /* |
| 30 | * On disk super block. |
| 31 | * This uses only 512 B but uses on disk a full 4KB block. This block is |
| 32 | * followed on disk by the mapping table of chunks to zones and the bitmap |
| 33 | * blocks indicating zone block validity. |
| 34 | * The overall resulting metadata format is: |
| 35 | * (1) Super block (1 block) |
| 36 | * (2) Chunk mapping table (nr_map_blocks) |
| 37 | * (3) Bitmap blocks (nr_bitmap_blocks) |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 38 | * All metadata blocks are stored in conventional zones, starting from |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 39 | * the first conventional zone found on disk. |
| 40 | */ |
| 41 | struct dmz_super { |
| 42 | /* Magic number */ |
| 43 | __le32 magic; /* 4 */ |
| 44 | |
| 45 | /* Metadata version number */ |
| 46 | __le32 version; /* 8 */ |
| 47 | |
| 48 | /* Generation number */ |
| 49 | __le64 gen; /* 16 */ |
| 50 | |
| 51 | /* This block number */ |
| 52 | __le64 sb_block; /* 24 */ |
| 53 | |
| 54 | /* The number of metadata blocks, including this super block */ |
| 55 | __le32 nr_meta_blocks; /* 28 */ |
| 56 | |
| 57 | /* The number of sequential zones reserved for reclaim */ |
| 58 | __le32 nr_reserved_seq; /* 32 */ |
| 59 | |
| 60 | /* The number of entries in the mapping table */ |
| 61 | __le32 nr_chunks; /* 36 */ |
| 62 | |
| 63 | /* The number of blocks used for the chunk mapping table */ |
| 64 | __le32 nr_map_blocks; /* 40 */ |
| 65 | |
| 66 | /* The number of blocks used for the block bitmaps */ |
| 67 | __le32 nr_bitmap_blocks; /* 44 */ |
| 68 | |
| 69 | /* Checksum */ |
| 70 | __le32 crc; /* 48 */ |
| 71 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 72 | /* DM-Zoned label */ |
| 73 | u8 dmz_label[32]; /* 80 */ |
| 74 | |
| 75 | /* DM-Zoned UUID */ |
| 76 | u8 dmz_uuid[16]; /* 96 */ |
| 77 | |
| 78 | /* Device UUID */ |
| 79 | u8 dev_uuid[16]; /* 112 */ |
| 80 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 81 | /* Padding to full 512B sector */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 82 | u8 reserved[400]; /* 512 */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 83 | }; |
| 84 | |
| 85 | /* |
| 86 | * Chunk mapping entry: entries are indexed by chunk number |
| 87 | * and give the zone ID (dzone_id) mapping the chunk on disk. |
| 88 | * This zone may be sequential or random. If it is a sequential |
| 89 | * zone, a second zone (bzone_id) used as a write buffer may |
| 90 | * also be specified. This second zone will always be a randomly |
| 91 | * writeable zone. |
| 92 | */ |
| 93 | struct dmz_map { |
| 94 | __le32 dzone_id; |
| 95 | __le32 bzone_id; |
| 96 | }; |
| 97 | |
| 98 | /* |
| 99 | * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. |
| 100 | */ |
| 101 | #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) |
| 102 | #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) |
| 103 | #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) |
| 104 | #define DMZ_MAP_UNMAPPED UINT_MAX |
| 105 | |
| 106 | /* |
| 107 | * Meta data block descriptor (for cached metadata blocks). |
| 108 | */ |
| 109 | struct dmz_mblock { |
| 110 | struct rb_node node; |
| 111 | struct list_head link; |
| 112 | sector_t no; |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 113 | unsigned int ref; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 114 | unsigned long state; |
| 115 | struct page *page; |
| 116 | void *data; |
| 117 | }; |
| 118 | |
| 119 | /* |
| 120 | * Metadata block state flags. |
| 121 | */ |
| 122 | enum { |
| 123 | DMZ_META_DIRTY, |
| 124 | DMZ_META_READING, |
| 125 | DMZ_META_WRITING, |
| 126 | DMZ_META_ERROR, |
| 127 | }; |
| 128 | |
| 129 | /* |
| 130 | * Super block information (one per metadata set). |
| 131 | */ |
| 132 | struct dmz_sb { |
| 133 | sector_t block; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 134 | struct dmz_dev *dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 135 | struct dmz_mblock *mblk; |
| 136 | struct dmz_super *sb; |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 137 | struct dm_zone *zone; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 138 | }; |
| 139 | |
| 140 | /* |
| 141 | * In-memory metadata. |
| 142 | */ |
| 143 | struct dmz_metadata { |
| 144 | struct dmz_dev *dev; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 145 | unsigned int nr_devs; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 146 | |
Hannes Reinecke | 2234e73 | 2020-05-11 10:24:22 +0200 | [diff] [blame] | 147 | char devname[BDEVNAME_SIZE]; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 148 | char label[BDEVNAME_SIZE]; |
| 149 | uuid_t uuid; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 150 | |
| 151 | sector_t zone_bitmap_size; |
| 152 | unsigned int zone_nr_bitmap_blocks; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 153 | unsigned int zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 154 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 155 | sector_t zone_nr_blocks; |
| 156 | sector_t zone_nr_blocks_shift; |
| 157 | |
| 158 | sector_t zone_nr_sectors; |
| 159 | sector_t zone_nr_sectors_shift; |
| 160 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 161 | unsigned int nr_bitmap_blocks; |
| 162 | unsigned int nr_map_blocks; |
| 163 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 164 | unsigned int nr_zones; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 165 | unsigned int nr_useable_zones; |
| 166 | unsigned int nr_meta_blocks; |
| 167 | unsigned int nr_meta_zones; |
| 168 | unsigned int nr_data_zones; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 169 | unsigned int nr_cache_zones; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 170 | unsigned int nr_rnd_zones; |
| 171 | unsigned int nr_reserved_seq; |
| 172 | unsigned int nr_chunks; |
| 173 | |
| 174 | /* Zone information array */ |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 175 | struct xarray zones; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 176 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 177 | struct dmz_sb sb[2]; |
| 178 | unsigned int mblk_primary; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 179 | unsigned int sb_version; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 180 | u64 sb_gen; |
| 181 | unsigned int min_nr_mblks; |
| 182 | unsigned int max_nr_mblks; |
| 183 | atomic_t nr_mblks; |
| 184 | struct rw_semaphore mblk_sem; |
| 185 | struct mutex mblk_flush_lock; |
| 186 | spinlock_t mblk_lock; |
| 187 | struct rb_root mblk_rbtree; |
| 188 | struct list_head mblk_lru_list; |
| 189 | struct list_head mblk_dirty_list; |
| 190 | struct shrinker mblk_shrinker; |
| 191 | |
| 192 | /* Zone allocation management */ |
| 193 | struct mutex map_lock; |
| 194 | struct dmz_mblock **map_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 195 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 196 | unsigned int nr_cache; |
| 197 | atomic_t unmap_nr_cache; |
| 198 | struct list_head unmap_cache_list; |
| 199 | struct list_head map_cache_list; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 200 | |
| 201 | atomic_t nr_reserved_seq_zones; |
| 202 | struct list_head reserved_seq_zones_list; |
| 203 | |
| 204 | wait_queue_head_t free_wq; |
| 205 | }; |
| 206 | |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 207 | #define dmz_zmd_info(zmd, format, args...) \ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 208 | DMINFO("(%s): " format, (zmd)->label, ## args) |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 209 | |
| 210 | #define dmz_zmd_err(zmd, format, args...) \ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 211 | DMERR("(%s): " format, (zmd)->label, ## args) |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 212 | |
| 213 | #define dmz_zmd_warn(zmd, format, args...) \ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 214 | DMWARN("(%s): " format, (zmd)->label, ## args) |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 215 | |
| 216 | #define dmz_zmd_debug(zmd, format, args...) \ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 217 | DMDEBUG("(%s): " format, (zmd)->label, ## args) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 218 | /* |
| 219 | * Various accessors |
| 220 | */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 221 | static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 222 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 223 | if (WARN_ON(!zone)) |
| 224 | return 0; |
| 225 | |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 226 | return zone->id - zone->dev->zone_offset; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 230 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 231 | unsigned int zone_id = dmz_dev_zone_id(zmd, zone); |
| 232 | |
| 233 | return (sector_t)zone_id << zmd->zone_nr_sectors_shift; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 237 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 238 | unsigned int zone_id = dmz_dev_zone_id(zmd, zone); |
| 239 | |
| 240 | return (sector_t)zone_id << zmd->zone_nr_blocks_shift; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 241 | } |
| 242 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 243 | unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd) |
| 244 | { |
| 245 | return zmd->zone_nr_blocks; |
| 246 | } |
| 247 | |
| 248 | unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd) |
| 249 | { |
| 250 | return zmd->zone_nr_blocks_shift; |
| 251 | } |
| 252 | |
| 253 | unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd) |
| 254 | { |
| 255 | return zmd->zone_nr_sectors; |
| 256 | } |
| 257 | |
| 258 | unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd) |
| 259 | { |
| 260 | return zmd->zone_nr_sectors_shift; |
| 261 | } |
| 262 | |
Hannes Reinecke | bc3d571 | 2020-05-11 10:24:16 +0200 | [diff] [blame] | 263 | unsigned int dmz_nr_zones(struct dmz_metadata *zmd) |
| 264 | { |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 265 | return zmd->nr_zones; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) |
| 269 | { |
| 270 | return zmd->nr_chunks; |
| 271 | } |
| 272 | |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 273 | unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd, int idx) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 274 | { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 275 | return zmd->dev[idx].nr_rnd; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 276 | } |
| 277 | |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 278 | unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd, int idx) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 279 | { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 280 | return atomic_read(&zmd->dev[idx].unmap_nr_rnd); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 281 | } |
| 282 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 283 | unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd) |
| 284 | { |
| 285 | return zmd->nr_cache; |
| 286 | } |
| 287 | |
| 288 | unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd) |
| 289 | { |
| 290 | return atomic_read(&zmd->unmap_nr_cache); |
| 291 | } |
| 292 | |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 293 | unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd, int idx) |
Hannes Reinecke | bc3d571 | 2020-05-11 10:24:16 +0200 | [diff] [blame] | 294 | { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 295 | return zmd->dev[idx].nr_seq; |
Hannes Reinecke | bc3d571 | 2020-05-11 10:24:16 +0200 | [diff] [blame] | 296 | } |
| 297 | |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 298 | unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd, int idx) |
Hannes Reinecke | bc3d571 | 2020-05-11 10:24:16 +0200 | [diff] [blame] | 299 | { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 300 | return atomic_read(&zmd->dev[idx].unmap_nr_seq); |
Hannes Reinecke | bc3d571 | 2020-05-11 10:24:16 +0200 | [diff] [blame] | 301 | } |
| 302 | |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 303 | static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) |
| 304 | { |
| 305 | return xa_load(&zmd->zones, zone_id); |
| 306 | } |
| 307 | |
| 308 | static struct dm_zone *dmz_insert(struct dmz_metadata *zmd, |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 309 | unsigned int zone_id, struct dmz_dev *dev) |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 310 | { |
| 311 | struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL); |
| 312 | |
| 313 | if (!zone) |
| 314 | return ERR_PTR(-ENOMEM); |
| 315 | |
| 316 | if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL)) { |
| 317 | kfree(zone); |
| 318 | return ERR_PTR(-EBUSY); |
| 319 | } |
| 320 | |
| 321 | INIT_LIST_HEAD(&zone->link); |
| 322 | atomic_set(&zone->refcount, 0); |
| 323 | zone->id = zone_id; |
| 324 | zone->chunk = DMZ_MAP_UNMAPPED; |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 325 | zone->dev = dev; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 326 | |
| 327 | return zone; |
| 328 | } |
| 329 | |
Hannes Reinecke | 2234e73 | 2020-05-11 10:24:22 +0200 | [diff] [blame] | 330 | const char *dmz_metadata_label(struct dmz_metadata *zmd) |
| 331 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 332 | return (const char *)zmd->label; |
Hannes Reinecke | 2234e73 | 2020-05-11 10:24:22 +0200 | [diff] [blame] | 333 | } |
| 334 | |
Hannes Reinecke | d0e21ce | 2020-05-11 10:24:23 +0200 | [diff] [blame] | 335 | bool dmz_check_dev(struct dmz_metadata *zmd) |
| 336 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 337 | unsigned int i; |
| 338 | |
| 339 | for (i = 0; i < zmd->nr_devs; i++) { |
| 340 | if (!dmz_check_bdev(&zmd->dev[i])) |
| 341 | return false; |
| 342 | } |
| 343 | return true; |
Hannes Reinecke | d0e21ce | 2020-05-11 10:24:23 +0200 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | bool dmz_dev_is_dying(struct dmz_metadata *zmd) |
| 347 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 348 | unsigned int i; |
| 349 | |
| 350 | for (i = 0; i < zmd->nr_devs; i++) { |
| 351 | if (dmz_bdev_is_dying(&zmd->dev[i])) |
| 352 | return true; |
| 353 | } |
| 354 | return false; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Lock/unlock mapping table. |
| 359 | * The map lock also protects all the zone lists. |
| 360 | */ |
| 361 | void dmz_lock_map(struct dmz_metadata *zmd) |
| 362 | { |
| 363 | mutex_lock(&zmd->map_lock); |
| 364 | } |
| 365 | |
| 366 | void dmz_unlock_map(struct dmz_metadata *zmd) |
| 367 | { |
| 368 | mutex_unlock(&zmd->map_lock); |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Lock/unlock metadata access. This is a "read" lock on a semaphore |
| 373 | * that prevents metadata flush from running while metadata are being |
| 374 | * modified. The actual metadata write mutual exclusion is achieved with |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 375 | * the map lock and zone state management (active and reclaim state are |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 376 | * mutually exclusive). |
| 377 | */ |
| 378 | void dmz_lock_metadata(struct dmz_metadata *zmd) |
| 379 | { |
| 380 | down_read(&zmd->mblk_sem); |
| 381 | } |
| 382 | |
| 383 | void dmz_unlock_metadata(struct dmz_metadata *zmd) |
| 384 | { |
| 385 | up_read(&zmd->mblk_sem); |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * Lock/unlock flush: prevent concurrent executions |
| 390 | * of dmz_flush_metadata as well as metadata modification in reclaim |
| 391 | * while flush is being executed. |
| 392 | */ |
| 393 | void dmz_lock_flush(struct dmz_metadata *zmd) |
| 394 | { |
| 395 | mutex_lock(&zmd->mblk_flush_lock); |
| 396 | } |
| 397 | |
| 398 | void dmz_unlock_flush(struct dmz_metadata *zmd) |
| 399 | { |
| 400 | mutex_unlock(&zmd->mblk_flush_lock); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Allocate a metadata block. |
| 405 | */ |
| 406 | static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, |
| 407 | sector_t mblk_no) |
| 408 | { |
| 409 | struct dmz_mblock *mblk = NULL; |
| 410 | |
| 411 | /* See if we can reuse cached blocks */ |
| 412 | if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { |
| 413 | spin_lock(&zmd->mblk_lock); |
| 414 | mblk = list_first_entry_or_null(&zmd->mblk_lru_list, |
| 415 | struct dmz_mblock, link); |
| 416 | if (mblk) { |
| 417 | list_del_init(&mblk->link); |
| 418 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 419 | mblk->no = mblk_no; |
| 420 | } |
| 421 | spin_unlock(&zmd->mblk_lock); |
| 422 | if (mblk) |
| 423 | return mblk; |
| 424 | } |
| 425 | |
| 426 | /* Allocate a new block */ |
| 427 | mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); |
| 428 | if (!mblk) |
| 429 | return NULL; |
| 430 | |
| 431 | mblk->page = alloc_page(GFP_NOIO); |
| 432 | if (!mblk->page) { |
| 433 | kfree(mblk); |
| 434 | return NULL; |
| 435 | } |
| 436 | |
| 437 | RB_CLEAR_NODE(&mblk->node); |
| 438 | INIT_LIST_HEAD(&mblk->link); |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 439 | mblk->ref = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 440 | mblk->state = 0; |
| 441 | mblk->no = mblk_no; |
| 442 | mblk->data = page_address(mblk->page); |
| 443 | |
| 444 | atomic_inc(&zmd->nr_mblks); |
| 445 | |
| 446 | return mblk; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Free a metadata block. |
| 451 | */ |
| 452 | static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 453 | { |
| 454 | __free_pages(mblk->page, 0); |
| 455 | kfree(mblk); |
| 456 | |
| 457 | atomic_dec(&zmd->nr_mblks); |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Insert a metadata block in the rbtree. |
| 462 | */ |
| 463 | static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 464 | { |
| 465 | struct rb_root *root = &zmd->mblk_rbtree; |
| 466 | struct rb_node **new = &(root->rb_node), *parent = NULL; |
| 467 | struct dmz_mblock *b; |
| 468 | |
| 469 | /* Figure out where to put the new node */ |
| 470 | while (*new) { |
| 471 | b = container_of(*new, struct dmz_mblock, node); |
| 472 | parent = *new; |
| 473 | new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); |
| 474 | } |
| 475 | |
| 476 | /* Add new node and rebalance tree */ |
| 477 | rb_link_node(&mblk->node, parent, new); |
| 478 | rb_insert_color(&mblk->node, root); |
| 479 | } |
| 480 | |
| 481 | /* |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 482 | * Lookup a metadata block in the rbtree. If the block is found, increment |
| 483 | * its reference count. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 484 | */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 485 | static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, |
| 486 | sector_t mblk_no) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 487 | { |
| 488 | struct rb_root *root = &zmd->mblk_rbtree; |
| 489 | struct rb_node *node = root->rb_node; |
| 490 | struct dmz_mblock *mblk; |
| 491 | |
| 492 | while (node) { |
| 493 | mblk = container_of(node, struct dmz_mblock, node); |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 494 | if (mblk->no == mblk_no) { |
| 495 | /* |
| 496 | * If this is the first reference to the block, |
| 497 | * remove it from the LRU list. |
| 498 | */ |
| 499 | mblk->ref++; |
| 500 | if (mblk->ref == 1 && |
| 501 | !test_bit(DMZ_META_DIRTY, &mblk->state)) |
| 502 | list_del_init(&mblk->link); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 503 | return mblk; |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 504 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 505 | node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; |
| 506 | } |
| 507 | |
| 508 | return NULL; |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Metadata block BIO end callback. |
| 513 | */ |
| 514 | static void dmz_mblock_bio_end_io(struct bio *bio) |
| 515 | { |
| 516 | struct dmz_mblock *mblk = bio->bi_private; |
| 517 | int flag; |
| 518 | |
| 519 | if (bio->bi_status) |
| 520 | set_bit(DMZ_META_ERROR, &mblk->state); |
| 521 | |
| 522 | if (bio_op(bio) == REQ_OP_WRITE) |
| 523 | flag = DMZ_META_WRITING; |
| 524 | else |
| 525 | flag = DMZ_META_READING; |
| 526 | |
| 527 | clear_bit_unlock(flag, &mblk->state); |
| 528 | smp_mb__after_atomic(); |
| 529 | wake_up_bit(&mblk->state, flag); |
| 530 | |
| 531 | bio_put(bio); |
| 532 | } |
| 533 | |
| 534 | /* |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 535 | * Read an uncached metadata block from disk and add it to the cache. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 536 | */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 537 | static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, |
| 538 | sector_t mblk_no) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 539 | { |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 540 | struct dmz_mblock *mblk, *m; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 541 | sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 542 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 543 | struct bio *bio; |
| 544 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 545 | if (dmz_bdev_is_dying(dev)) |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 546 | return ERR_PTR(-EIO); |
| 547 | |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 548 | /* Get a new block and a BIO to read it */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 549 | mblk = dmz_alloc_mblock(zmd, mblk_no); |
| 550 | if (!mblk) |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 551 | return ERR_PTR(-ENOMEM); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 552 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 553 | bio = bio_alloc(GFP_NOIO, 1); |
| 554 | if (!bio) { |
| 555 | dmz_free_mblock(zmd, mblk); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 556 | return ERR_PTR(-ENOMEM); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 557 | } |
| 558 | |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 559 | spin_lock(&zmd->mblk_lock); |
| 560 | |
| 561 | /* |
| 562 | * Make sure that another context did not start reading |
| 563 | * the block already. |
| 564 | */ |
| 565 | m = dmz_get_mblock_fast(zmd, mblk_no); |
| 566 | if (m) { |
| 567 | spin_unlock(&zmd->mblk_lock); |
| 568 | dmz_free_mblock(zmd, mblk); |
| 569 | bio_put(bio); |
| 570 | return m; |
| 571 | } |
| 572 | |
| 573 | mblk->ref++; |
| 574 | set_bit(DMZ_META_READING, &mblk->state); |
| 575 | dmz_insert_mblock(zmd, mblk); |
| 576 | |
| 577 | spin_unlock(&zmd->mblk_lock); |
| 578 | |
| 579 | /* Submit read BIO */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 580 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 581 | bio_set_dev(bio, dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 582 | bio->bi_private = mblk; |
| 583 | bio->bi_end_io = dmz_mblock_bio_end_io; |
| 584 | bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); |
| 585 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
| 586 | submit_bio(bio); |
| 587 | |
| 588 | return mblk; |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * Free metadata blocks. |
| 593 | */ |
| 594 | static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, |
| 595 | unsigned long limit) |
| 596 | { |
| 597 | struct dmz_mblock *mblk; |
| 598 | unsigned long count = 0; |
| 599 | |
| 600 | if (!zmd->max_nr_mblks) |
| 601 | return 0; |
| 602 | |
| 603 | while (!list_empty(&zmd->mblk_lru_list) && |
| 604 | atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && |
| 605 | count < limit) { |
| 606 | mblk = list_first_entry(&zmd->mblk_lru_list, |
| 607 | struct dmz_mblock, link); |
| 608 | list_del_init(&mblk->link); |
| 609 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 610 | dmz_free_mblock(zmd, mblk); |
| 611 | count++; |
| 612 | } |
| 613 | |
| 614 | return count; |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * For mblock shrinker: get the number of unused metadata blocks in the cache. |
| 619 | */ |
| 620 | static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, |
| 621 | struct shrink_control *sc) |
| 622 | { |
| 623 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); |
| 624 | |
| 625 | return atomic_read(&zmd->nr_mblks); |
| 626 | } |
| 627 | |
| 628 | /* |
| 629 | * For mblock shrinker: scan unused metadata blocks and shrink the cache. |
| 630 | */ |
| 631 | static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, |
| 632 | struct shrink_control *sc) |
| 633 | { |
| 634 | struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); |
| 635 | unsigned long count; |
| 636 | |
| 637 | spin_lock(&zmd->mblk_lock); |
| 638 | count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); |
| 639 | spin_unlock(&zmd->mblk_lock); |
| 640 | |
| 641 | return count ? count : SHRINK_STOP; |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | * Release a metadata block. |
| 646 | */ |
| 647 | static void dmz_release_mblock(struct dmz_metadata *zmd, |
| 648 | struct dmz_mblock *mblk) |
| 649 | { |
| 650 | |
| 651 | if (!mblk) |
| 652 | return; |
| 653 | |
| 654 | spin_lock(&zmd->mblk_lock); |
| 655 | |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 656 | mblk->ref--; |
| 657 | if (mblk->ref == 0) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 658 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 659 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 660 | dmz_free_mblock(zmd, mblk); |
| 661 | } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { |
| 662 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
| 663 | dmz_shrink_mblock_cache(zmd, 1); |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | spin_unlock(&zmd->mblk_lock); |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Get a metadata block from the rbtree. If the block |
| 672 | * is not present, read it from disk. |
| 673 | */ |
| 674 | static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, |
| 675 | sector_t mblk_no) |
| 676 | { |
| 677 | struct dmz_mblock *mblk; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 678 | struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 679 | |
| 680 | /* Check rbtree */ |
| 681 | spin_lock(&zmd->mblk_lock); |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 682 | mblk = dmz_get_mblock_fast(zmd, mblk_no); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 683 | spin_unlock(&zmd->mblk_lock); |
| 684 | |
| 685 | if (!mblk) { |
| 686 | /* Cache miss: read the block from disk */ |
Damien Le Moal | 3d4e738 | 2018-10-17 18:05:08 +0900 | [diff] [blame] | 687 | mblk = dmz_get_mblock_slow(zmd, mblk_no); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 688 | if (IS_ERR(mblk)) |
| 689 | return mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 690 | } |
| 691 | |
| 692 | /* Wait for on-going read I/O and check for error */ |
| 693 | wait_on_bit_io(&mblk->state, DMZ_META_READING, |
| 694 | TASK_UNINTERRUPTIBLE); |
| 695 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 696 | dmz_release_mblock(zmd, mblk); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 697 | dmz_check_bdev(dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 698 | return ERR_PTR(-EIO); |
| 699 | } |
| 700 | |
| 701 | return mblk; |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * Mark a metadata block dirty. |
| 706 | */ |
| 707 | static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) |
| 708 | { |
| 709 | spin_lock(&zmd->mblk_lock); |
| 710 | if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) |
| 711 | list_add_tail(&mblk->link, &zmd->mblk_dirty_list); |
| 712 | spin_unlock(&zmd->mblk_lock); |
| 713 | } |
| 714 | |
| 715 | /* |
| 716 | * Issue a metadata block write BIO. |
| 717 | */ |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 718 | static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, |
| 719 | unsigned int set) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 720 | { |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 721 | struct dmz_dev *dev = zmd->sb[set].dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 722 | sector_t block = zmd->sb[set].block + mblk->no; |
| 723 | struct bio *bio; |
| 724 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 725 | if (dmz_bdev_is_dying(dev)) |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 726 | return -EIO; |
| 727 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 728 | bio = bio_alloc(GFP_NOIO, 1); |
| 729 | if (!bio) { |
| 730 | set_bit(DMZ_META_ERROR, &mblk->state); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 731 | return -ENOMEM; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | set_bit(DMZ_META_WRITING, &mblk->state); |
| 735 | |
| 736 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 737 | bio_set_dev(bio, dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 738 | bio->bi_private = mblk; |
| 739 | bio->bi_end_io = dmz_mblock_bio_end_io; |
| 740 | bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); |
| 741 | bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); |
| 742 | submit_bio(bio); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 743 | |
| 744 | return 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | /* |
| 748 | * Read/write a metadata block. |
| 749 | */ |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 750 | static int dmz_rdwr_block(struct dmz_dev *dev, int op, |
| 751 | sector_t block, struct page *page) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 752 | { |
| 753 | struct bio *bio; |
| 754 | int ret; |
| 755 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 756 | if (WARN_ON(!dev)) |
| 757 | return -EIO; |
| 758 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 759 | if (dmz_bdev_is_dying(dev)) |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 760 | return -EIO; |
| 761 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 762 | bio = bio_alloc(GFP_NOIO, 1); |
| 763 | if (!bio) |
| 764 | return -ENOMEM; |
| 765 | |
| 766 | bio->bi_iter.bi_sector = dmz_blk2sect(block); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 767 | bio_set_dev(bio, dev->bdev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 768 | bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); |
| 769 | bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); |
| 770 | ret = submit_bio_wait(bio); |
| 771 | bio_put(bio); |
| 772 | |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 773 | if (ret) |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 774 | dmz_check_bdev(dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 775 | return ret; |
| 776 | } |
| 777 | |
| 778 | /* |
| 779 | * Write super block of the specified metadata set. |
| 780 | */ |
| 781 | static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) |
| 782 | { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 783 | struct dmz_mblock *mblk = zmd->sb[set].mblk; |
| 784 | struct dmz_super *sb = zmd->sb[set].sb; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 785 | struct dmz_dev *dev = zmd->sb[set].dev; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 786 | sector_t sb_block; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 787 | u64 sb_gen = zmd->sb_gen + 1; |
| 788 | int ret; |
| 789 | |
| 790 | sb->magic = cpu_to_le32(DMZ_MAGIC); |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 791 | |
| 792 | sb->version = cpu_to_le32(zmd->sb_version); |
| 793 | if (zmd->sb_version > 1) { |
| 794 | BUILD_BUG_ON(UUID_SIZE != 16); |
| 795 | export_uuid(sb->dmz_uuid, &zmd->uuid); |
| 796 | memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE); |
| 797 | export_uuid(sb->dev_uuid, &dev->uuid); |
| 798 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 799 | |
| 800 | sb->gen = cpu_to_le64(sb_gen); |
| 801 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 802 | /* |
| 803 | * The metadata always references the absolute block address, |
| 804 | * ie relative to the entire block range, not the per-device |
| 805 | * block address. |
| 806 | */ |
| 807 | sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift; |
| 808 | sb->sb_block = cpu_to_le64(sb_block); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 809 | sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); |
| 810 | sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); |
| 811 | sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); |
| 812 | |
| 813 | sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); |
| 814 | sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); |
| 815 | |
| 816 | sb->crc = 0; |
| 817 | sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); |
| 818 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 819 | ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block, |
| 820 | mblk->page); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 821 | if (ret == 0) |
Linus Torvalds | b25c664 | 2020-06-05 15:45:03 -0700 | [diff] [blame] | 822 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 823 | |
| 824 | return ret; |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Write dirty metadata blocks to the specified set. |
| 829 | */ |
| 830 | static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, |
| 831 | struct list_head *write_list, |
| 832 | unsigned int set) |
| 833 | { |
| 834 | struct dmz_mblock *mblk; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 835 | struct dmz_dev *dev = zmd->sb[set].dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 836 | struct blk_plug plug; |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 837 | int ret = 0, nr_mblks_submitted = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 838 | |
| 839 | /* Issue writes */ |
| 840 | blk_start_plug(&plug); |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 841 | list_for_each_entry(mblk, write_list, link) { |
| 842 | ret = dmz_write_mblock(zmd, mblk, set); |
| 843 | if (ret) |
| 844 | break; |
| 845 | nr_mblks_submitted++; |
| 846 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 847 | blk_finish_plug(&plug); |
| 848 | |
| 849 | /* Wait for completion */ |
| 850 | list_for_each_entry(mblk, write_list, link) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 851 | if (!nr_mblks_submitted) |
| 852 | break; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 853 | wait_on_bit_io(&mblk->state, DMZ_META_WRITING, |
| 854 | TASK_UNINTERRUPTIBLE); |
| 855 | if (test_bit(DMZ_META_ERROR, &mblk->state)) { |
| 856 | clear_bit(DMZ_META_ERROR, &mblk->state); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 857 | dmz_check_bdev(dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 858 | ret = -EIO; |
| 859 | } |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 860 | nr_mblks_submitted--; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | /* Flush drive cache (this will also sync data) */ |
| 864 | if (ret == 0) |
Linus Torvalds | b25c664 | 2020-06-05 15:45:03 -0700 | [diff] [blame] | 865 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 866 | |
| 867 | return ret; |
| 868 | } |
| 869 | |
| 870 | /* |
| 871 | * Log dirty metadata blocks. |
| 872 | */ |
| 873 | static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, |
| 874 | struct list_head *write_list) |
| 875 | { |
| 876 | unsigned int log_set = zmd->mblk_primary ^ 0x1; |
| 877 | int ret; |
| 878 | |
| 879 | /* Write dirty blocks to the log */ |
| 880 | ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); |
| 881 | if (ret) |
| 882 | return ret; |
| 883 | |
| 884 | /* |
| 885 | * No error so far: now validate the log by updating the |
| 886 | * log index super block generation. |
| 887 | */ |
| 888 | ret = dmz_write_sb(zmd, log_set); |
| 889 | if (ret) |
| 890 | return ret; |
| 891 | |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | /* |
| 896 | * Flush dirty metadata blocks. |
| 897 | */ |
| 898 | int dmz_flush_metadata(struct dmz_metadata *zmd) |
| 899 | { |
| 900 | struct dmz_mblock *mblk; |
| 901 | struct list_head write_list; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 902 | struct dmz_dev *dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 903 | int ret; |
| 904 | |
| 905 | if (WARN_ON(!zmd)) |
| 906 | return 0; |
| 907 | |
| 908 | INIT_LIST_HEAD(&write_list); |
| 909 | |
| 910 | /* |
| 911 | * Make sure that metadata blocks are stable before logging: take |
| 912 | * the write lock on the metadata semaphore to prevent target BIOs |
| 913 | * from modifying metadata. |
| 914 | */ |
| 915 | down_write(&zmd->mblk_sem); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 916 | dev = zmd->sb[zmd->mblk_primary].dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 917 | |
| 918 | /* |
| 919 | * This is called from the target flush work and reclaim work. |
| 920 | * Concurrent execution is not allowed. |
| 921 | */ |
| 922 | dmz_lock_flush(zmd); |
| 923 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 924 | if (dmz_bdev_is_dying(dev)) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 925 | ret = -EIO; |
| 926 | goto out; |
| 927 | } |
| 928 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 929 | /* Get dirty blocks */ |
| 930 | spin_lock(&zmd->mblk_lock); |
| 931 | list_splice_init(&zmd->mblk_dirty_list, &write_list); |
| 932 | spin_unlock(&zmd->mblk_lock); |
| 933 | |
| 934 | /* If there are no dirty metadata blocks, just flush the device cache */ |
| 935 | if (list_empty(&write_list)) { |
Linus Torvalds | b25c664 | 2020-06-05 15:45:03 -0700 | [diff] [blame] | 936 | ret = blkdev_issue_flush(dev->bdev, GFP_NOIO); |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 937 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | /* |
| 941 | * The primary metadata set is still clean. Keep it this way until |
| 942 | * all updates are successful in the secondary set. That is, use |
| 943 | * the secondary set as a log. |
| 944 | */ |
| 945 | ret = dmz_log_dirty_mblocks(zmd, &write_list); |
| 946 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 947 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 948 | |
| 949 | /* |
| 950 | * The log is on disk. It is now safe to update in place |
| 951 | * in the primary metadata set. |
| 952 | */ |
| 953 | ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); |
| 954 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 955 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 956 | |
| 957 | ret = dmz_write_sb(zmd, zmd->mblk_primary); |
| 958 | if (ret) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 959 | goto err; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 960 | |
| 961 | while (!list_empty(&write_list)) { |
| 962 | mblk = list_first_entry(&write_list, struct dmz_mblock, link); |
| 963 | list_del_init(&mblk->link); |
| 964 | |
| 965 | spin_lock(&zmd->mblk_lock); |
| 966 | clear_bit(DMZ_META_DIRTY, &mblk->state); |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 967 | if (mblk->ref == 0) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 968 | list_add_tail(&mblk->link, &zmd->mblk_lru_list); |
| 969 | spin_unlock(&zmd->mblk_lock); |
| 970 | } |
| 971 | |
| 972 | zmd->sb_gen++; |
| 973 | out: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 974 | dmz_unlock_flush(zmd); |
| 975 | up_write(&zmd->mblk_sem); |
| 976 | |
| 977 | return ret; |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 978 | |
| 979 | err: |
| 980 | if (!list_empty(&write_list)) { |
| 981 | spin_lock(&zmd->mblk_lock); |
| 982 | list_splice(&write_list, &zmd->mblk_dirty_list); |
| 983 | spin_unlock(&zmd->mblk_lock); |
| 984 | } |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 985 | if (!dmz_check_bdev(dev)) |
Dmitry Fomichev | e7fad90 | 2019-11-06 14:34:35 -0800 | [diff] [blame] | 986 | ret = -EIO; |
| 987 | goto out; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | /* |
| 991 | * Check super block. |
| 992 | */ |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 993 | static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb, |
| 994 | bool tertiary) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 995 | { |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 996 | struct dmz_super *sb = dsb->sb; |
| 997 | struct dmz_dev *dev = dsb->dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 998 | unsigned int nr_meta_zones, nr_data_zones; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 999 | u32 crc, stored_crc; |
Hannes Reinecke | 27d49ac | 2020-06-02 13:09:56 +0200 | [diff] [blame] | 1000 | u64 gen, sb_block; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1001 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1002 | if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { |
| 1003 | dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", |
| 1004 | DMZ_MAGIC, le32_to_cpu(sb->magic)); |
| 1005 | return -ENXIO; |
| 1006 | } |
| 1007 | |
| 1008 | zmd->sb_version = le32_to_cpu(sb->version); |
| 1009 | if (zmd->sb_version > DMZ_META_VER) { |
| 1010 | dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", |
| 1011 | DMZ_META_VER, zmd->sb_version); |
| 1012 | return -EINVAL; |
| 1013 | } |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1014 | if (zmd->sb_version < 2 && tertiary) { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1015 | dmz_dev_err(dev, "Tertiary superblocks are not supported"); |
| 1016 | return -EINVAL; |
| 1017 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1018 | |
| 1019 | gen = le64_to_cpu(sb->gen); |
| 1020 | stored_crc = le32_to_cpu(sb->crc); |
| 1021 | sb->crc = 0; |
| 1022 | crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); |
| 1023 | if (crc != stored_crc) { |
| 1024 | dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", |
| 1025 | crc, stored_crc); |
| 1026 | return -ENXIO; |
| 1027 | } |
| 1028 | |
Hannes Reinecke | 27d49ac | 2020-06-02 13:09:56 +0200 | [diff] [blame] | 1029 | sb_block = le64_to_cpu(sb->sb_block); |
| 1030 | if (sb_block != (u64)dsb->zone->id << zmd->zone_nr_blocks_shift ) { |
| 1031 | dmz_dev_err(dev, "Invalid superblock position " |
| 1032 | "(is %llu expected %llu)", |
| 1033 | sb_block, |
| 1034 | (u64)dsb->zone->id << zmd->zone_nr_blocks_shift); |
| 1035 | return -EINVAL; |
| 1036 | } |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1037 | if (zmd->sb_version > 1) { |
| 1038 | uuid_t sb_uuid; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1039 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1040 | import_uuid(&sb_uuid, sb->dmz_uuid); |
| 1041 | if (uuid_is_null(&sb_uuid)) { |
| 1042 | dmz_dev_err(dev, "NULL DM-Zoned uuid"); |
| 1043 | return -ENXIO; |
| 1044 | } else if (uuid_is_null(&zmd->uuid)) { |
| 1045 | uuid_copy(&zmd->uuid, &sb_uuid); |
| 1046 | } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) { |
| 1047 | dmz_dev_err(dev, "mismatching DM-Zoned uuid, " |
| 1048 | "is %pUl expected %pUl", |
| 1049 | &sb_uuid, &zmd->uuid); |
| 1050 | return -ENXIO; |
| 1051 | } |
| 1052 | if (!strlen(zmd->label)) |
| 1053 | memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE); |
| 1054 | else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) { |
| 1055 | dmz_dev_err(dev, "mismatching DM-Zoned label, " |
| 1056 | "is %s expected %s", |
| 1057 | sb->dmz_label, zmd->label); |
| 1058 | return -ENXIO; |
| 1059 | } |
| 1060 | import_uuid(&dev->uuid, sb->dev_uuid); |
| 1061 | if (uuid_is_null(&dev->uuid)) { |
| 1062 | dmz_dev_err(dev, "NULL device uuid"); |
| 1063 | return -ENXIO; |
| 1064 | } |
| 1065 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1066 | if (tertiary) { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1067 | /* |
| 1068 | * Generation number should be 0, but it doesn't |
| 1069 | * really matter if it isn't. |
| 1070 | */ |
| 1071 | if (gen != 0) |
| 1072 | dmz_dev_warn(dev, "Invalid generation %llu", |
| 1073 | gen); |
| 1074 | return 0; |
| 1075 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1076 | } |
| 1077 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1078 | nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1) |
| 1079 | >> zmd->zone_nr_blocks_shift; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1080 | if (!nr_meta_zones || |
| 1081 | nr_meta_zones >= zmd->nr_rnd_zones) { |
| 1082 | dmz_dev_err(dev, "Invalid number of metadata blocks"); |
| 1083 | return -ENXIO; |
| 1084 | } |
| 1085 | |
| 1086 | if (!le32_to_cpu(sb->nr_reserved_seq) || |
| 1087 | le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { |
| 1088 | dmz_dev_err(dev, "Invalid number of reserved sequential zones"); |
| 1089 | return -ENXIO; |
| 1090 | } |
| 1091 | |
| 1092 | nr_data_zones = zmd->nr_useable_zones - |
| 1093 | (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); |
| 1094 | if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { |
| 1095 | dmz_dev_err(dev, "Invalid number of chunks %u / %u", |
| 1096 | le32_to_cpu(sb->nr_chunks), nr_data_zones); |
| 1097 | return -ENXIO; |
| 1098 | } |
| 1099 | |
| 1100 | /* OK */ |
| 1101 | zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); |
| 1102 | zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); |
| 1103 | zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); |
| 1104 | zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); |
| 1105 | zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); |
| 1106 | zmd->nr_meta_zones = nr_meta_zones; |
| 1107 | zmd->nr_data_zones = nr_data_zones; |
| 1108 | |
| 1109 | return 0; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Read the first or second super block from disk. |
| 1114 | */ |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1115 | static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1116 | { |
Hannes Reinecke | 35d0c96 | 2020-06-02 13:09:42 +0200 | [diff] [blame] | 1117 | dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu", |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1118 | set, sb->dev->name, sb->block); |
Hannes Reinecke | 35d0c96 | 2020-06-02 13:09:42 +0200 | [diff] [blame] | 1119 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1120 | return dmz_rdwr_block(sb->dev, REQ_OP_READ, |
| 1121 | sb->block, sb->mblk->page); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1122 | } |
| 1123 | |
| 1124 | /* |
| 1125 | * Determine the position of the secondary super blocks on disk. |
| 1126 | * This is used only if a corruption of the primary super block |
| 1127 | * is detected. |
| 1128 | */ |
| 1129 | static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) |
| 1130 | { |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1131 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1132 | struct dmz_mblock *mblk; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1133 | unsigned int zone_id = zmd->sb[0].zone->id; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1134 | int i; |
| 1135 | |
| 1136 | /* Allocate a block */ |
| 1137 | mblk = dmz_alloc_mblock(zmd, 0); |
| 1138 | if (!mblk) |
| 1139 | return -ENOMEM; |
| 1140 | |
| 1141 | zmd->sb[1].mblk = mblk; |
| 1142 | zmd->sb[1].sb = mblk->data; |
| 1143 | |
| 1144 | /* Bad first super block: search for the second one */ |
| 1145 | zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1146 | zmd->sb[1].zone = dmz_get(zmd, zone_id + 1); |
Hannes Reinecke | 1565929 | 2020-06-02 13:09:43 +0200 | [diff] [blame] | 1147 | zmd->sb[1].dev = zmd->sb[0].dev; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1148 | for (i = 1; i < zmd->nr_rnd_zones; i++) { |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1149 | if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1150 | break; |
| 1151 | if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) |
| 1152 | return 0; |
| 1153 | zmd->sb[1].block += zone_nr_blocks; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1154 | zmd->sb[1].zone = dmz_get(zmd, zone_id + i); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | dmz_free_mblock(zmd, mblk); |
| 1158 | zmd->sb[1].mblk = NULL; |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1159 | zmd->sb[1].zone = NULL; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1160 | zmd->sb[1].dev = NULL; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1161 | |
| 1162 | return -EIO; |
| 1163 | } |
| 1164 | |
| 1165 | /* |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1166 | * Read a super block from disk. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1167 | */ |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1168 | static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1169 | { |
| 1170 | struct dmz_mblock *mblk; |
| 1171 | int ret; |
| 1172 | |
| 1173 | /* Allocate a block */ |
| 1174 | mblk = dmz_alloc_mblock(zmd, 0); |
| 1175 | if (!mblk) |
| 1176 | return -ENOMEM; |
| 1177 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1178 | sb->mblk = mblk; |
| 1179 | sb->sb = mblk->data; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1180 | |
| 1181 | /* Read super block */ |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1182 | ret = dmz_read_sb(zmd, sb, set); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1183 | if (ret) { |
| 1184 | dmz_free_mblock(zmd, mblk); |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1185 | sb->mblk = NULL; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1186 | return ret; |
| 1187 | } |
| 1188 | |
| 1189 | return 0; |
| 1190 | } |
| 1191 | |
| 1192 | /* |
| 1193 | * Recover a metadata set. |
| 1194 | */ |
| 1195 | static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) |
| 1196 | { |
| 1197 | unsigned int src_set = dst_set ^ 0x1; |
| 1198 | struct page *page; |
| 1199 | int i, ret; |
| 1200 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1201 | dmz_dev_warn(zmd->sb[dst_set].dev, |
| 1202 | "Metadata set %u invalid: recovering", dst_set); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1203 | |
| 1204 | if (dst_set == 0) |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1205 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
| 1206 | else |
| 1207 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1208 | |
Damien Le Moal | 4218a95 | 2017-07-24 16:44:37 +0900 | [diff] [blame] | 1209 | page = alloc_page(GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1210 | if (!page) |
| 1211 | return -ENOMEM; |
| 1212 | |
| 1213 | /* Copy metadata blocks */ |
| 1214 | for (i = 1; i < zmd->nr_meta_blocks; i++) { |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1215 | ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ, |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1216 | zmd->sb[src_set].block + i, page); |
| 1217 | if (ret) |
| 1218 | goto out; |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1219 | ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE, |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1220 | zmd->sb[dst_set].block + i, page); |
| 1221 | if (ret) |
| 1222 | goto out; |
| 1223 | } |
| 1224 | |
| 1225 | /* Finalize with the super block */ |
| 1226 | if (!zmd->sb[dst_set].mblk) { |
| 1227 | zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); |
| 1228 | if (!zmd->sb[dst_set].mblk) { |
| 1229 | ret = -ENOMEM; |
| 1230 | goto out; |
| 1231 | } |
| 1232 | zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; |
| 1233 | } |
| 1234 | |
| 1235 | ret = dmz_write_sb(zmd, dst_set); |
| 1236 | out: |
| 1237 | __free_pages(page, 0); |
| 1238 | |
| 1239 | return ret; |
| 1240 | } |
| 1241 | |
| 1242 | /* |
| 1243 | * Get super block from disk. |
| 1244 | */ |
| 1245 | static int dmz_load_sb(struct dmz_metadata *zmd) |
| 1246 | { |
| 1247 | bool sb_good[2] = {false, false}; |
| 1248 | u64 sb_gen[2] = {0, 0}; |
| 1249 | int ret; |
| 1250 | |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1251 | if (!zmd->sb[0].zone) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 1252 | dmz_zmd_err(zmd, "Primary super block zone not set"); |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1253 | return -ENXIO; |
| 1254 | } |
| 1255 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1256 | /* Read and check the primary super block */ |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1257 | zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1258 | zmd->sb[0].dev = zmd->sb[0].zone->dev; |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1259 | ret = dmz_get_sb(zmd, &zmd->sb[0], 0); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1260 | if (ret) { |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1261 | dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed"); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1262 | return ret; |
| 1263 | } |
| 1264 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1265 | ret = dmz_check_sb(zmd, &zmd->sb[0], false); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1266 | |
| 1267 | /* Read and check secondary super block */ |
| 1268 | if (ret == 0) { |
| 1269 | sb_good[0] = true; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1270 | if (!zmd->sb[1].zone) { |
| 1271 | unsigned int zone_id = |
| 1272 | zmd->sb[0].zone->id + zmd->nr_meta_zones; |
| 1273 | |
| 1274 | zmd->sb[1].zone = dmz_get(zmd, zone_id); |
| 1275 | } |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1276 | zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); |
Hannes Reinecke | 1565929 | 2020-06-02 13:09:43 +0200 | [diff] [blame] | 1277 | zmd->sb[1].dev = zmd->sb[0].dev; |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1278 | ret = dmz_get_sb(zmd, &zmd->sb[1], 1); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1279 | } else |
| 1280 | ret = dmz_lookup_secondary_sb(zmd); |
| 1281 | |
| 1282 | if (ret) { |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1283 | dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed"); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1284 | return ret; |
| 1285 | } |
| 1286 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1287 | ret = dmz_check_sb(zmd, &zmd->sb[1], false); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1288 | if (ret == 0) |
| 1289 | sb_good[1] = true; |
| 1290 | |
| 1291 | /* Use highest generation sb first */ |
| 1292 | if (!sb_good[0] && !sb_good[1]) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 1293 | dmz_zmd_err(zmd, "No valid super block found"); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1294 | return -EIO; |
| 1295 | } |
| 1296 | |
| 1297 | if (sb_good[0]) |
| 1298 | sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1299 | else { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1300 | ret = dmz_recover_mblocks(zmd, 0); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1301 | if (ret) { |
| 1302 | dmz_dev_err(zmd->sb[0].dev, |
| 1303 | "Recovery of superblock 0 failed"); |
| 1304 | return -EIO; |
| 1305 | } |
| 1306 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1307 | |
| 1308 | if (sb_good[1]) |
| 1309 | sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1310 | else { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1311 | ret = dmz_recover_mblocks(zmd, 1); |
| 1312 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1313 | if (ret) { |
| 1314 | dmz_dev_err(zmd->sb[1].dev, |
| 1315 | "Recovery of superblock 1 failed"); |
| 1316 | return -EIO; |
| 1317 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1318 | } |
| 1319 | |
| 1320 | if (sb_gen[0] >= sb_gen[1]) { |
| 1321 | zmd->sb_gen = sb_gen[0]; |
| 1322 | zmd->mblk_primary = 0; |
| 1323 | } else { |
| 1324 | zmd->sb_gen = sb_gen[1]; |
| 1325 | zmd->mblk_primary = 1; |
| 1326 | } |
| 1327 | |
Hannes Reinecke | bf28a3b | 2020-05-11 10:24:20 +0200 | [diff] [blame] | 1328 | dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev, |
| 1329 | "Using super block %u (gen %llu)", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1330 | zmd->mblk_primary, zmd->sb_gen); |
| 1331 | |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1332 | if (zmd->sb_version > 1) { |
| 1333 | int i; |
| 1334 | struct dmz_sb *sb; |
| 1335 | |
| 1336 | sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL); |
| 1337 | if (!sb) |
| 1338 | return -ENOMEM; |
| 1339 | for (i = 1; i < zmd->nr_devs; i++) { |
| 1340 | sb->block = 0; |
| 1341 | sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset); |
| 1342 | sb->dev = &zmd->dev[i]; |
| 1343 | if (!dmz_is_meta(sb->zone)) { |
| 1344 | dmz_dev_err(sb->dev, |
| 1345 | "Tertiary super block zone %u not marked as metadata zone", |
| 1346 | sb->zone->id); |
| 1347 | ret = -EINVAL; |
| 1348 | goto out_kfree; |
| 1349 | } |
| 1350 | ret = dmz_get_sb(zmd, sb, i + 1); |
| 1351 | if (ret) { |
| 1352 | dmz_dev_err(sb->dev, |
| 1353 | "Read tertiary super block failed"); |
| 1354 | dmz_free_mblock(zmd, sb->mblk); |
| 1355 | goto out_kfree; |
| 1356 | } |
| 1357 | ret = dmz_check_sb(zmd, sb, true); |
| 1358 | dmz_free_mblock(zmd, sb->mblk); |
| 1359 | if (ret == -EINVAL) |
| 1360 | goto out_kfree; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1361 | } |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1362 | out_kfree: |
| 1363 | kfree(sb); |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1364 | } |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1365 | return ret; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | /* |
| 1369 | * Initialize a zone descriptor. |
| 1370 | */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1371 | static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1372 | { |
Hannes Reinecke | 1897981 | 2020-06-02 13:09:49 +0200 | [diff] [blame] | 1373 | struct dmz_dev *dev = data; |
| 1374 | struct dmz_metadata *zmd = dev->metadata; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1375 | int idx = num + dev->zone_offset; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1376 | struct dm_zone *zone; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1377 | |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1378 | zone = dmz_insert(zmd, idx, dev); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1379 | if (IS_ERR(zone)) |
| 1380 | return PTR_ERR(zone); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1381 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1382 | if (blkz->len != zmd->zone_nr_sectors) { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1383 | if (zmd->sb_version > 1) { |
| 1384 | /* Ignore the eventual runt (smaller) zone */ |
| 1385 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1386 | return 0; |
| 1387 | } else if (blkz->start + blkz->len == dev->capacity) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1388 | return 0; |
| 1389 | return -ENXIO; |
| 1390 | } |
| 1391 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1392 | switch (blkz->type) { |
| 1393 | case BLK_ZONE_TYPE_CONVENTIONAL: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1394 | set_bit(DMZ_RND, &zone->flags); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1395 | break; |
| 1396 | case BLK_ZONE_TYPE_SEQWRITE_REQ: |
| 1397 | case BLK_ZONE_TYPE_SEQWRITE_PREF: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1398 | set_bit(DMZ_SEQ, &zone->flags); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1399 | break; |
| 1400 | default: |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1401 | return -ENXIO; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1402 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1403 | |
| 1404 | if (dmz_is_rnd(zone)) |
| 1405 | zone->wp_block = 0; |
| 1406 | else |
| 1407 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); |
| 1408 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1409 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
| 1410 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1411 | else if (blkz->cond == BLK_ZONE_COND_READONLY) |
| 1412 | set_bit(DMZ_READ_ONLY, &zone->flags); |
| 1413 | else { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1414 | zmd->nr_useable_zones++; |
| 1415 | if (dmz_is_rnd(zone)) { |
| 1416 | zmd->nr_rnd_zones++; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1417 | if (zmd->nr_devs == 1 && !zmd->sb[0].zone) { |
| 1418 | /* Primary super block zone */ |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 1419 | zmd->sb[0].zone = zone; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1420 | } |
| 1421 | } |
Hannes Reinecke | 5d2c74f | 2020-06-02 13:09:47 +0200 | [diff] [blame] | 1422 | if (zmd->nr_devs > 1 && num == 0) { |
| 1423 | /* |
| 1424 | * Tertiary superblock zones are always at the |
| 1425 | * start of the zoned devices, so mark them |
| 1426 | * as metadata zone. |
| 1427 | */ |
| 1428 | set_bit(DMZ_META, &zone->flags); |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1429 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1430 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1431 | return 0; |
| 1432 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1433 | |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1434 | static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev) |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1435 | { |
| 1436 | int idx; |
| 1437 | sector_t zone_offset = 0; |
| 1438 | |
| 1439 | for(idx = 0; idx < dev->nr_zones; idx++) { |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1440 | struct dm_zone *zone; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1441 | |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1442 | zone = dmz_insert(zmd, idx, dev); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1443 | if (IS_ERR(zone)) |
| 1444 | return PTR_ERR(zone); |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1445 | set_bit(DMZ_CACHE, &zone->flags); |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1446 | zone->wp_block = 0; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1447 | zmd->nr_cache_zones++; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1448 | zmd->nr_useable_zones++; |
| 1449 | if (dev->capacity - zone_offset < zmd->zone_nr_sectors) { |
| 1450 | /* Disable runt zone */ |
| 1451 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1452 | break; |
| 1453 | } |
| 1454 | zone_offset += zmd->zone_nr_sectors; |
| 1455 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1456 | return 0; |
| 1457 | } |
| 1458 | |
| 1459 | /* |
| 1460 | * Free zones descriptors. |
| 1461 | */ |
| 1462 | static void dmz_drop_zones(struct dmz_metadata *zmd) |
| 1463 | { |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1464 | int idx; |
| 1465 | |
| 1466 | for(idx = 0; idx < zmd->nr_zones; idx++) { |
| 1467 | struct dm_zone *zone = xa_load(&zmd->zones, idx); |
| 1468 | |
| 1469 | kfree(zone); |
| 1470 | xa_erase(&zmd->zones, idx); |
| 1471 | } |
| 1472 | xa_destroy(&zmd->zones); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | /* |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1476 | * Allocate and initialize zone descriptors using the zone |
| 1477 | * information from disk. |
| 1478 | */ |
| 1479 | static int dmz_init_zones(struct dmz_metadata *zmd) |
| 1480 | { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1481 | int i, ret; |
| 1482 | struct dmz_dev *zoned_dev = &zmd->dev[0]; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1483 | |
| 1484 | /* Init */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1485 | zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors; |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1486 | zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors); |
| 1487 | zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors); |
| 1488 | zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks); |
| 1489 | zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 1490 | zmd->zone_nr_bitmap_blocks = |
| 1491 | max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1492 | zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks, |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 1493 | DMZ_BLOCK_SIZE_BITS); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1494 | |
| 1495 | /* Allocate zone array */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1496 | zmd->nr_zones = 0; |
Hannes Reinecke | 1897981 | 2020-06-02 13:09:49 +0200 | [diff] [blame] | 1497 | for (i = 0; i < zmd->nr_devs; i++) { |
| 1498 | struct dmz_dev *dev = &zmd->dev[i]; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1499 | |
Hannes Reinecke | 1897981 | 2020-06-02 13:09:49 +0200 | [diff] [blame] | 1500 | dev->metadata = zmd; |
| 1501 | zmd->nr_zones += dev->nr_zones; |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1502 | |
| 1503 | atomic_set(&dev->unmap_nr_rnd, 0); |
| 1504 | INIT_LIST_HEAD(&dev->unmap_rnd_list); |
| 1505 | INIT_LIST_HEAD(&dev->map_rnd_list); |
| 1506 | |
| 1507 | atomic_set(&dev->unmap_nr_seq, 0); |
| 1508 | INIT_LIST_HEAD(&dev->unmap_seq_list); |
| 1509 | INIT_LIST_HEAD(&dev->map_seq_list); |
Hannes Reinecke | 1897981 | 2020-06-02 13:09:49 +0200 | [diff] [blame] | 1510 | } |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1511 | |
| 1512 | if (!zmd->nr_zones) { |
| 1513 | DMERR("(%s): No zones found", zmd->devname); |
| 1514 | return -ENXIO; |
| 1515 | } |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1516 | xa_init(&zmd->zones); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1517 | |
Hannes Reinecke | ae3c1f1 | 2020-05-11 10:24:28 +0200 | [diff] [blame] | 1518 | DMDEBUG("(%s): Using %zu B for zone information", |
| 1519 | zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1520 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1521 | if (zmd->nr_devs > 1) { |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1522 | ret = dmz_emulate_zones(zmd, &zmd->dev[0]); |
| 1523 | if (ret < 0) { |
| 1524 | DMDEBUG("(%s): Failed to emulate zones, error %d", |
| 1525 | zmd->devname, ret); |
| 1526 | dmz_drop_zones(zmd); |
| 1527 | return ret; |
| 1528 | } |
| 1529 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1530 | /* |
| 1531 | * Primary superblock zone is always at zone 0 when multiple |
| 1532 | * drives are present. |
| 1533 | */ |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1534 | zmd->sb[0].zone = dmz_get(zmd, 0); |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1535 | |
Hannes Reinecke | 4dba128 | 2020-06-02 13:09:52 +0200 | [diff] [blame] | 1536 | for (i = 1; i < zmd->nr_devs; i++) { |
| 1537 | zoned_dev = &zmd->dev[i]; |
| 1538 | |
| 1539 | ret = blkdev_report_zones(zoned_dev->bdev, 0, |
| 1540 | BLK_ALL_ZONES, |
| 1541 | dmz_init_zone, zoned_dev); |
| 1542 | if (ret < 0) { |
| 1543 | DMDEBUG("(%s): Failed to report zones, error %d", |
| 1544 | zmd->devname, ret); |
| 1545 | dmz_drop_zones(zmd); |
| 1546 | return ret; |
| 1547 | } |
| 1548 | } |
| 1549 | return 0; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1550 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1551 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1552 | /* |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1553 | * Get zone information and initialize zone descriptors. At the same |
| 1554 | * time, determine where the super block should be: first block of the |
| 1555 | * first randomly writable zone. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1556 | */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1557 | ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES, |
Hannes Reinecke | 1897981 | 2020-06-02 13:09:49 +0200 | [diff] [blame] | 1558 | dmz_init_zone, zoned_dev); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1559 | if (ret < 0) { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1560 | DMDEBUG("(%s): Failed to report zones, error %d", |
| 1561 | zmd->devname, ret); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1562 | dmz_drop_zones(zmd); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1563 | return ret; |
| 1564 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1565 | |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, |
| 1570 | void *data) |
| 1571 | { |
| 1572 | struct dm_zone *zone = data; |
| 1573 | |
| 1574 | clear_bit(DMZ_OFFLINE, &zone->flags); |
| 1575 | clear_bit(DMZ_READ_ONLY, &zone->flags); |
| 1576 | if (blkz->cond == BLK_ZONE_COND_OFFLINE) |
| 1577 | set_bit(DMZ_OFFLINE, &zone->flags); |
| 1578 | else if (blkz->cond == BLK_ZONE_COND_READONLY) |
| 1579 | set_bit(DMZ_READ_ONLY, &zone->flags); |
| 1580 | |
| 1581 | if (dmz_is_seq(zone)) |
| 1582 | zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); |
| 1583 | else |
| 1584 | zone->wp_block = 0; |
| 1585 | return 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1586 | } |
| 1587 | |
| 1588 | /* |
| 1589 | * Update a zone information. |
| 1590 | */ |
| 1591 | static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1592 | { |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1593 | struct dmz_dev *dev = zone->dev; |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1594 | unsigned int noio_flag; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1595 | int ret; |
| 1596 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 1597 | if (dev->flags & DMZ_BDEV_REGULAR) |
| 1598 | return 0; |
| 1599 | |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1600 | /* |
| 1601 | * Get zone information from disk. Since blkdev_report_zones() uses |
| 1602 | * GFP_KERNEL by default for memory allocations, set the per-task |
| 1603 | * PF_MEMALLOC_NOIO flag so that all allocations are done as if |
| 1604 | * GFP_NOIO was specified. |
| 1605 | */ |
| 1606 | noio_flag = memalloc_noio_save(); |
Hannes Reinecke | aa821c8 | 2020-05-11 10:24:26 +0200 | [diff] [blame] | 1607 | ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1, |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1608 | dmz_update_zone_cb, zone); |
Damien Le Moal | bd976e5 | 2019-07-01 14:09:16 +0900 | [diff] [blame] | 1609 | memalloc_noio_restore(noio_flag); |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1610 | |
| 1611 | if (ret == 0) |
Damien Le Moal | 7aedf75 | 2019-04-18 18:03:07 +0900 | [diff] [blame] | 1612 | ret = -EIO; |
Christoph Hellwig | d410035 | 2019-11-11 11:39:30 +0900 | [diff] [blame] | 1613 | if (ret < 0) { |
Hannes Reinecke | aa821c8 | 2020-05-11 10:24:26 +0200 | [diff] [blame] | 1614 | dmz_dev_err(dev, "Get zone %u report failed", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 1615 | zone->id); |
Hannes Reinecke | aa821c8 | 2020-05-11 10:24:26 +0200 | [diff] [blame] | 1616 | dmz_check_bdev(dev); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1617 | return ret; |
| 1618 | } |
| 1619 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1620 | return 0; |
| 1621 | } |
| 1622 | |
| 1623 | /* |
| 1624 | * Check a zone write pointer position when the zone is marked |
| 1625 | * with the sequential write error flag. |
| 1626 | */ |
| 1627 | static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, |
| 1628 | struct dm_zone *zone) |
| 1629 | { |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1630 | struct dmz_dev *dev = zone->dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1631 | unsigned int wp = 0; |
| 1632 | int ret; |
| 1633 | |
| 1634 | wp = zone->wp_block; |
| 1635 | ret = dmz_update_zone(zmd, zone); |
| 1636 | if (ret) |
| 1637 | return ret; |
| 1638 | |
Hannes Reinecke | aa821c8 | 2020-05-11 10:24:26 +0200 | [diff] [blame] | 1639 | dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 1640 | zone->id, zone->wp_block, wp); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1641 | |
| 1642 | if (zone->wp_block < wp) { |
| 1643 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, |
| 1644 | wp - zone->wp_block); |
| 1645 | } |
| 1646 | |
| 1647 | return 0; |
| 1648 | } |
| 1649 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1650 | /* |
| 1651 | * Reset a zone write pointer. |
| 1652 | */ |
| 1653 | static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1654 | { |
| 1655 | int ret; |
| 1656 | |
| 1657 | /* |
| 1658 | * Ignore offline zones, read only zones, |
| 1659 | * and conventional zones. |
| 1660 | */ |
| 1661 | if (dmz_is_offline(zone) || |
| 1662 | dmz_is_readonly(zone) || |
| 1663 | dmz_is_rnd(zone)) |
| 1664 | return 0; |
| 1665 | |
| 1666 | if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 1667 | struct dmz_dev *dev = zone->dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1668 | |
Ajay Joshi | 6c1b1da | 2019-10-27 23:05:45 +0900 | [diff] [blame] | 1669 | ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, |
| 1670 | dmz_start_sect(zmd, zone), |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1671 | zmd->zone_nr_sectors, GFP_NOIO); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1672 | if (ret) { |
| 1673 | dmz_dev_err(dev, "Reset zone %u failed %d", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 1674 | zone->id, ret); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1675 | return ret; |
| 1676 | } |
| 1677 | } |
| 1678 | |
| 1679 | /* Clear write error bit and rewind write pointer position */ |
| 1680 | clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); |
| 1681 | zone->wp_block = 0; |
| 1682 | |
| 1683 | return 0; |
| 1684 | } |
| 1685 | |
| 1686 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); |
| 1687 | |
| 1688 | /* |
| 1689 | * Initialize chunk mapping. |
| 1690 | */ |
| 1691 | static int dmz_load_mapping(struct dmz_metadata *zmd) |
| 1692 | { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1693 | struct dm_zone *dzone, *bzone; |
| 1694 | struct dmz_mblock *dmap_mblk = NULL; |
| 1695 | struct dmz_map *dmap; |
| 1696 | unsigned int i = 0, e = 0, chunk = 0; |
| 1697 | unsigned int dzone_id; |
| 1698 | unsigned int bzone_id; |
| 1699 | |
| 1700 | /* Metadata block array for the chunk mapping table */ |
| 1701 | zmd->map_mblk = kcalloc(zmd->nr_map_blocks, |
| 1702 | sizeof(struct dmz_mblk *), GFP_KERNEL); |
| 1703 | if (!zmd->map_mblk) |
| 1704 | return -ENOMEM; |
| 1705 | |
| 1706 | /* Get chunk mapping table blocks and initialize zone mapping */ |
| 1707 | while (chunk < zmd->nr_chunks) { |
| 1708 | if (!dmap_mblk) { |
| 1709 | /* Get mapping block */ |
| 1710 | dmap_mblk = dmz_get_mblock(zmd, i + 1); |
| 1711 | if (IS_ERR(dmap_mblk)) |
| 1712 | return PTR_ERR(dmap_mblk); |
| 1713 | zmd->map_mblk[i] = dmap_mblk; |
| 1714 | dmap = (struct dmz_map *) dmap_mblk->data; |
| 1715 | i++; |
| 1716 | e = 0; |
| 1717 | } |
| 1718 | |
| 1719 | /* Check data zone */ |
| 1720 | dzone_id = le32_to_cpu(dmap[e].dzone_id); |
| 1721 | if (dzone_id == DMZ_MAP_UNMAPPED) |
| 1722 | goto next; |
| 1723 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1724 | if (dzone_id >= zmd->nr_zones) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 1725 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1726 | chunk, dzone_id); |
| 1727 | return -EIO; |
| 1728 | } |
| 1729 | |
| 1730 | dzone = dmz_get(zmd, dzone_id); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1731 | if (!dzone) { |
| 1732 | dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present", |
| 1733 | chunk, dzone_id); |
| 1734 | return -EIO; |
| 1735 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1736 | set_bit(DMZ_DATA, &dzone->flags); |
| 1737 | dzone->chunk = chunk; |
| 1738 | dmz_get_zone_weight(zmd, dzone); |
| 1739 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1740 | if (dmz_is_cache(dzone)) |
| 1741 | list_add_tail(&dzone->link, &zmd->map_cache_list); |
| 1742 | else if (dmz_is_rnd(dzone)) |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1743 | list_add_tail(&dzone->link, &dzone->dev->map_rnd_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1744 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1745 | list_add_tail(&dzone->link, &dzone->dev->map_seq_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1746 | |
| 1747 | /* Check buffer zone */ |
| 1748 | bzone_id = le32_to_cpu(dmap[e].bzone_id); |
| 1749 | if (bzone_id == DMZ_MAP_UNMAPPED) |
| 1750 | goto next; |
| 1751 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1752 | if (bzone_id >= zmd->nr_zones) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 1753 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1754 | chunk, bzone_id); |
| 1755 | return -EIO; |
| 1756 | } |
| 1757 | |
| 1758 | bzone = dmz_get(zmd, bzone_id); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1759 | if (!bzone) { |
| 1760 | dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present", |
| 1761 | chunk, bzone_id); |
| 1762 | return -EIO; |
| 1763 | } |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1764 | if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 1765 | dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1766 | chunk, bzone_id); |
| 1767 | return -EIO; |
| 1768 | } |
| 1769 | |
| 1770 | set_bit(DMZ_DATA, &bzone->flags); |
| 1771 | set_bit(DMZ_BUF, &bzone->flags); |
| 1772 | bzone->chunk = chunk; |
| 1773 | bzone->bzone = dzone; |
| 1774 | dzone->bzone = bzone; |
| 1775 | dmz_get_zone_weight(zmd, bzone); |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1776 | if (dmz_is_cache(bzone)) |
| 1777 | list_add_tail(&bzone->link, &zmd->map_cache_list); |
| 1778 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1779 | list_add_tail(&bzone->link, &bzone->dev->map_rnd_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1780 | next: |
| 1781 | chunk++; |
| 1782 | e++; |
| 1783 | if (e >= DMZ_MAP_ENTRIES) |
| 1784 | dmap_mblk = NULL; |
| 1785 | } |
| 1786 | |
| 1787 | /* |
| 1788 | * At this point, only meta zones and mapped data zones were |
| 1789 | * fully initialized. All remaining zones are unmapped data |
| 1790 | * zones. Finish initializing those here. |
| 1791 | */ |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 1792 | for (i = 0; i < zmd->nr_zones; i++) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1793 | dzone = dmz_get(zmd, i); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 1794 | if (!dzone) |
| 1795 | continue; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1796 | if (dmz_is_meta(dzone)) |
| 1797 | continue; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1798 | if (dmz_is_offline(dzone)) |
| 1799 | continue; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1800 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1801 | if (dmz_is_cache(dzone)) |
| 1802 | zmd->nr_cache++; |
| 1803 | else if (dmz_is_rnd(dzone)) |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1804 | dzone->dev->nr_rnd++; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1805 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1806 | dzone->dev->nr_seq++; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1807 | |
| 1808 | if (dmz_is_data(dzone)) { |
| 1809 | /* Already initialized */ |
| 1810 | continue; |
| 1811 | } |
| 1812 | |
| 1813 | /* Unmapped data zone */ |
| 1814 | set_bit(DMZ_DATA, &dzone->flags); |
| 1815 | dzone->chunk = DMZ_MAP_UNMAPPED; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1816 | if (dmz_is_cache(dzone)) { |
| 1817 | list_add_tail(&dzone->link, &zmd->unmap_cache_list); |
| 1818 | atomic_inc(&zmd->unmap_nr_cache); |
| 1819 | } else if (dmz_is_rnd(dzone)) { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1820 | list_add_tail(&dzone->link, |
| 1821 | &dzone->dev->unmap_rnd_list); |
| 1822 | atomic_inc(&dzone->dev->unmap_nr_rnd); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1823 | } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { |
| 1824 | list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); |
Hannes Reinecke | aec67b4 | 2020-06-02 13:09:45 +0200 | [diff] [blame] | 1825 | set_bit(DMZ_RESERVED, &dzone->flags); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1826 | atomic_inc(&zmd->nr_reserved_seq_zones); |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1827 | dzone->dev->nr_seq--; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1828 | } else { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1829 | list_add_tail(&dzone->link, |
| 1830 | &dzone->dev->unmap_seq_list); |
| 1831 | atomic_inc(&dzone->dev->unmap_nr_seq); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1832 | } |
| 1833 | } |
| 1834 | |
| 1835 | return 0; |
| 1836 | } |
| 1837 | |
| 1838 | /* |
| 1839 | * Set a data chunk mapping. |
| 1840 | */ |
| 1841 | static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, |
| 1842 | unsigned int dzone_id, unsigned int bzone_id) |
| 1843 | { |
| 1844 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; |
| 1845 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; |
| 1846 | int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
| 1847 | |
| 1848 | dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); |
| 1849 | dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); |
| 1850 | dmz_dirty_mblock(zmd, dmap_mblk); |
| 1851 | } |
| 1852 | |
| 1853 | /* |
| 1854 | * The list of mapped zones is maintained in LRU order. |
| 1855 | * This rotates a zone at the end of its map list. |
| 1856 | */ |
| 1857 | static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1858 | { |
| 1859 | if (list_empty(&zone->link)) |
| 1860 | return; |
| 1861 | |
| 1862 | list_del_init(&zone->link); |
| 1863 | if (dmz_is_seq(zone)) { |
| 1864 | /* LRU rotate sequential zone */ |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1865 | list_add_tail(&zone->link, &zone->dev->map_seq_list); |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1866 | } else if (dmz_is_cache(zone)) { |
| 1867 | /* LRU rotate cache zone */ |
| 1868 | list_add_tail(&zone->link, &zmd->map_cache_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1869 | } else { |
| 1870 | /* LRU rotate random zone */ |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1871 | list_add_tail(&zone->link, &zone->dev->map_rnd_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1872 | } |
| 1873 | } |
| 1874 | |
| 1875 | /* |
| 1876 | * The list of mapped random zones is maintained |
| 1877 | * in LRU order. This rotates a zone at the end of the list. |
| 1878 | */ |
| 1879 | static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1880 | { |
| 1881 | __dmz_lru_zone(zmd, zone); |
| 1882 | if (zone->bzone) |
| 1883 | __dmz_lru_zone(zmd, zone->bzone); |
| 1884 | } |
| 1885 | |
| 1886 | /* |
| 1887 | * Wait for any zone to be freed. |
| 1888 | */ |
| 1889 | static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) |
| 1890 | { |
| 1891 | DEFINE_WAIT(wait); |
| 1892 | |
| 1893 | prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); |
| 1894 | dmz_unlock_map(zmd); |
| 1895 | dmz_unlock_metadata(zmd); |
| 1896 | |
| 1897 | io_schedule_timeout(HZ); |
| 1898 | |
| 1899 | dmz_lock_metadata(zmd); |
| 1900 | dmz_lock_map(zmd); |
| 1901 | finish_wait(&zmd->free_wq, &wait); |
| 1902 | } |
| 1903 | |
| 1904 | /* |
| 1905 | * Lock a zone for reclaim (set the zone RECLAIM bit). |
| 1906 | * Returns false if the zone cannot be locked or if it is already locked |
| 1907 | * and 1 otherwise. |
| 1908 | */ |
| 1909 | int dmz_lock_zone_reclaim(struct dm_zone *zone) |
| 1910 | { |
| 1911 | /* Active zones cannot be reclaimed */ |
| 1912 | if (dmz_is_active(zone)) |
| 1913 | return 0; |
| 1914 | |
| 1915 | return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); |
| 1916 | } |
| 1917 | |
| 1918 | /* |
| 1919 | * Clear a zone reclaim flag. |
| 1920 | */ |
| 1921 | void dmz_unlock_zone_reclaim(struct dm_zone *zone) |
| 1922 | { |
| 1923 | WARN_ON(dmz_is_active(zone)); |
| 1924 | WARN_ON(!dmz_in_reclaim(zone)); |
| 1925 | |
| 1926 | clear_bit_unlock(DMZ_RECLAIM, &zone->flags); |
| 1927 | smp_mb__after_atomic(); |
| 1928 | wake_up_bit(&zone->flags, DMZ_RECLAIM); |
| 1929 | } |
| 1930 | |
| 1931 | /* |
| 1932 | * Wait for a zone reclaim to complete. |
| 1933 | */ |
| 1934 | static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 1935 | { |
| 1936 | dmz_unlock_map(zmd); |
| 1937 | dmz_unlock_metadata(zmd); |
Hannes Reinecke | a16b7dee | 2020-05-19 10:14:23 +0200 | [diff] [blame] | 1938 | set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1939 | wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); |
Hannes Reinecke | a16b7dee | 2020-05-19 10:14:23 +0200 | [diff] [blame] | 1940 | clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1941 | dmz_lock_metadata(zmd); |
| 1942 | dmz_lock_map(zmd); |
| 1943 | } |
| 1944 | |
| 1945 | /* |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1946 | * Select a cache or random write zone for reclaim. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1947 | */ |
Hannes Reinecke | 90a9b86 | 2020-05-19 10:14:21 +0200 | [diff] [blame] | 1948 | static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd, |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1949 | unsigned int idx, bool idle) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1950 | { |
| 1951 | struct dm_zone *dzone = NULL; |
Hannes Reinecke | 2094045 | 2020-06-02 13:09:55 +0200 | [diff] [blame] | 1952 | struct dm_zone *zone, *last = NULL; |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 1953 | struct list_head *zone_list; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1954 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1955 | /* If we have cache zones select from the cache zone list */ |
Hannes Reinecke | 90a9b86 | 2020-05-19 10:14:21 +0200 | [diff] [blame] | 1956 | if (zmd->nr_cache) { |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1957 | zone_list = &zmd->map_cache_list; |
Hannes Reinecke | 90a9b86 | 2020-05-19 10:14:21 +0200 | [diff] [blame] | 1958 | /* Try to relaim random zones, too, when idle */ |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1959 | if (idle && list_empty(zone_list)) |
| 1960 | zone_list = &zmd->dev[idx].map_rnd_list; |
| 1961 | } else |
| 1962 | zone_list = &zmd->dev[idx].map_rnd_list; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1963 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 1964 | list_for_each_entry(zone, zone_list, link) { |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1965 | if (dmz_is_buf(zone)) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1966 | dzone = zone->bzone; |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1967 | if (dzone->dev->dev_idx != idx) |
| 1968 | continue; |
Hannes Reinecke | 2094045 | 2020-06-02 13:09:55 +0200 | [diff] [blame] | 1969 | if (!last) { |
| 1970 | last = dzone; |
| 1971 | continue; |
| 1972 | } |
| 1973 | if (last->weight < dzone->weight) |
| 1974 | continue; |
| 1975 | dzone = last; |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1976 | } else |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1977 | dzone = zone; |
| 1978 | if (dmz_lock_zone_reclaim(dzone)) |
| 1979 | return dzone; |
| 1980 | } |
| 1981 | |
Hannes Reinecke | 489dc0f | 2020-05-19 10:14:19 +0200 | [diff] [blame] | 1982 | return NULL; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1983 | } |
| 1984 | |
| 1985 | /* |
| 1986 | * Select a buffered sequential zone for reclaim. |
| 1987 | */ |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1988 | static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd, |
| 1989 | unsigned int idx) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1990 | { |
| 1991 | struct dm_zone *zone; |
| 1992 | |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 1993 | list_for_each_entry(zone, &zmd->dev[idx].map_seq_list, link) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 1994 | if (!zone->bzone) |
| 1995 | continue; |
| 1996 | if (dmz_lock_zone_reclaim(zone)) |
| 1997 | return zone; |
| 1998 | } |
| 1999 | |
Hannes Reinecke | 489dc0f | 2020-05-19 10:14:19 +0200 | [diff] [blame] | 2000 | return NULL; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2001 | } |
| 2002 | |
| 2003 | /* |
| 2004 | * Select a zone for reclaim. |
| 2005 | */ |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 2006 | struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, |
| 2007 | unsigned int dev_idx, bool idle) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2008 | { |
| 2009 | struct dm_zone *zone; |
| 2010 | |
| 2011 | /* |
| 2012 | * Search for a zone candidate to reclaim: 2 cases are possible. |
| 2013 | * (1) There is no free sequential zones. Then a random data zone |
| 2014 | * cannot be reclaimed. So choose a sequential zone to reclaim so |
| 2015 | * that afterward a random zone can be reclaimed. |
| 2016 | * (2) At least one free sequential zone is available, then choose |
| 2017 | * the oldest random zone (data or buffer) that can be locked. |
| 2018 | */ |
| 2019 | dmz_lock_map(zmd); |
| 2020 | if (list_empty(&zmd->reserved_seq_zones_list)) |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 2021 | zone = dmz_get_seq_zone_for_reclaim(zmd, dev_idx); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2022 | else |
Hannes Reinecke | 69875d4 | 2020-06-02 13:09:54 +0200 | [diff] [blame] | 2023 | zone = dmz_get_rnd_zone_for_reclaim(zmd, dev_idx, idle); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2024 | dmz_unlock_map(zmd); |
| 2025 | |
| 2026 | return zone; |
| 2027 | } |
| 2028 | |
| 2029 | /* |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2030 | * Get the zone mapping a chunk, if the chunk is mapped already. |
| 2031 | * If no mapping exist and the operation is WRITE, a zone is |
| 2032 | * allocated and used to map the chunk. |
| 2033 | * The zone returned will be set to the active state. |
| 2034 | */ |
| 2035 | struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) |
| 2036 | { |
| 2037 | struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; |
| 2038 | struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; |
| 2039 | int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; |
| 2040 | unsigned int dzone_id; |
| 2041 | struct dm_zone *dzone = NULL; |
| 2042 | int ret = 0; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2043 | int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2044 | |
| 2045 | dmz_lock_map(zmd); |
| 2046 | again: |
| 2047 | /* Get the chunk mapping */ |
| 2048 | dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); |
| 2049 | if (dzone_id == DMZ_MAP_UNMAPPED) { |
| 2050 | /* |
| 2051 | * Read or discard in unmapped chunks are fine. But for |
| 2052 | * writes, we need a mapping, so get one. |
| 2053 | */ |
| 2054 | if (op != REQ_OP_WRITE) |
| 2055 | goto out; |
| 2056 | |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 2057 | /* Allocate a random zone */ |
Hannes Reinecke | 22c1ef6 | 2020-06-02 13:09:53 +0200 | [diff] [blame] | 2058 | dzone = dmz_alloc_zone(zmd, 0, alloc_flags); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2059 | if (!dzone) { |
Hannes Reinecke | d0e21ce | 2020-05-11 10:24:23 +0200 | [diff] [blame] | 2060 | if (dmz_dev_is_dying(zmd)) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 2061 | dzone = ERR_PTR(-EIO); |
| 2062 | goto out; |
| 2063 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2064 | dmz_wait_for_free_zones(zmd); |
| 2065 | goto again; |
| 2066 | } |
| 2067 | |
| 2068 | dmz_map_zone(zmd, dzone, chunk); |
| 2069 | |
| 2070 | } else { |
| 2071 | /* The chunk is already mapped: get the mapping zone */ |
| 2072 | dzone = dmz_get(zmd, dzone_id); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 2073 | if (!dzone) { |
| 2074 | dzone = ERR_PTR(-EIO); |
| 2075 | goto out; |
| 2076 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2077 | if (dzone->chunk != chunk) { |
| 2078 | dzone = ERR_PTR(-EIO); |
| 2079 | goto out; |
| 2080 | } |
| 2081 | |
| 2082 | /* Repair write pointer if the sequential dzone has error */ |
| 2083 | if (dmz_seq_write_err(dzone)) { |
| 2084 | ret = dmz_handle_seq_write_err(zmd, dzone); |
| 2085 | if (ret) { |
| 2086 | dzone = ERR_PTR(-EIO); |
| 2087 | goto out; |
| 2088 | } |
| 2089 | clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); |
| 2090 | } |
| 2091 | } |
| 2092 | |
| 2093 | /* |
| 2094 | * If the zone is being reclaimed, the chunk mapping may change |
| 2095 | * to a different zone. So wait for reclaim and retry. Otherwise, |
| 2096 | * activate the zone (this will prevent reclaim from touching it). |
| 2097 | */ |
| 2098 | if (dmz_in_reclaim(dzone)) { |
| 2099 | dmz_wait_for_reclaim(zmd, dzone); |
| 2100 | goto again; |
| 2101 | } |
| 2102 | dmz_activate_zone(dzone); |
| 2103 | dmz_lru_zone(zmd, dzone); |
| 2104 | out: |
| 2105 | dmz_unlock_map(zmd); |
| 2106 | |
| 2107 | return dzone; |
| 2108 | } |
| 2109 | |
| 2110 | /* |
| 2111 | * Write and discard change the block validity of data zones and their buffer |
| 2112 | * zones. Check here that valid blocks are still present. If all blocks are |
| 2113 | * invalid, the zones can be unmapped on the fly without waiting for reclaim |
| 2114 | * to do it. |
| 2115 | */ |
| 2116 | void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) |
| 2117 | { |
| 2118 | struct dm_zone *bzone; |
| 2119 | |
| 2120 | dmz_lock_map(zmd); |
| 2121 | |
| 2122 | bzone = dzone->bzone; |
| 2123 | if (bzone) { |
| 2124 | if (dmz_weight(bzone)) |
| 2125 | dmz_lru_zone(zmd, bzone); |
| 2126 | else { |
| 2127 | /* Empty buffer zone: reclaim it */ |
| 2128 | dmz_unmap_zone(zmd, bzone); |
| 2129 | dmz_free_zone(zmd, bzone); |
| 2130 | bzone = NULL; |
| 2131 | } |
| 2132 | } |
| 2133 | |
| 2134 | /* Deactivate the data zone */ |
| 2135 | dmz_deactivate_zone(dzone); |
| 2136 | if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) |
| 2137 | dmz_lru_zone(zmd, dzone); |
| 2138 | else { |
| 2139 | /* Unbuffered inactive empty data zone: reclaim it */ |
| 2140 | dmz_unmap_zone(zmd, dzone); |
| 2141 | dmz_free_zone(zmd, dzone); |
| 2142 | } |
| 2143 | |
| 2144 | dmz_unlock_map(zmd); |
| 2145 | } |
| 2146 | |
| 2147 | /* |
| 2148 | * Allocate and map a random zone to buffer a chunk |
| 2149 | * already mapped to a sequential zone. |
| 2150 | */ |
| 2151 | struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, |
| 2152 | struct dm_zone *dzone) |
| 2153 | { |
| 2154 | struct dm_zone *bzone; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2155 | int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2156 | |
| 2157 | dmz_lock_map(zmd); |
| 2158 | again: |
| 2159 | bzone = dzone->bzone; |
| 2160 | if (bzone) |
| 2161 | goto out; |
| 2162 | |
Dmitry Fomichev | ad1bd57 | 2019-08-02 15:02:51 -0700 | [diff] [blame] | 2163 | /* Allocate a random zone */ |
Hannes Reinecke | 22c1ef6 | 2020-06-02 13:09:53 +0200 | [diff] [blame] | 2164 | bzone = dmz_alloc_zone(zmd, 0, alloc_flags); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2165 | if (!bzone) { |
Hannes Reinecke | d0e21ce | 2020-05-11 10:24:23 +0200 | [diff] [blame] | 2166 | if (dmz_dev_is_dying(zmd)) { |
Dmitry Fomichev | 75d66ff | 2019-08-10 14:43:11 -0700 | [diff] [blame] | 2167 | bzone = ERR_PTR(-EIO); |
| 2168 | goto out; |
| 2169 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2170 | dmz_wait_for_free_zones(zmd); |
| 2171 | goto again; |
| 2172 | } |
| 2173 | |
| 2174 | /* Update the chunk mapping */ |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2175 | dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2176 | |
| 2177 | set_bit(DMZ_BUF, &bzone->flags); |
| 2178 | bzone->chunk = dzone->chunk; |
| 2179 | bzone->bzone = dzone; |
| 2180 | dzone->bzone = bzone; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2181 | if (dmz_is_cache(bzone)) |
| 2182 | list_add_tail(&bzone->link, &zmd->map_cache_list); |
| 2183 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2184 | list_add_tail(&bzone->link, &bzone->dev->map_rnd_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2185 | out: |
| 2186 | dmz_unlock_map(zmd); |
| 2187 | |
| 2188 | return bzone; |
| 2189 | } |
| 2190 | |
| 2191 | /* |
| 2192 | * Get an unmapped (free) zone. |
| 2193 | * This must be called with the mapping lock held. |
| 2194 | */ |
Hannes Reinecke | 22c1ef6 | 2020-06-02 13:09:53 +0200 | [diff] [blame] | 2195 | struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int dev_idx, |
| 2196 | unsigned long flags) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2197 | { |
| 2198 | struct list_head *list; |
| 2199 | struct dm_zone *zone; |
Hannes Reinecke | 22c1ef6 | 2020-06-02 13:09:53 +0200 | [diff] [blame] | 2200 | int i = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2201 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2202 | again: |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2203 | if (flags & DMZ_ALLOC_CACHE) |
| 2204 | list = &zmd->unmap_cache_list; |
| 2205 | else if (flags & DMZ_ALLOC_RND) |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2206 | list = &zmd->dev[dev_idx].unmap_rnd_list; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2207 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2208 | list = &zmd->dev[dev_idx].unmap_seq_list; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2209 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2210 | if (list_empty(list)) { |
| 2211 | /* |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2212 | * No free zone: return NULL if this is for not reclaim. |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2213 | */ |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2214 | if (!(flags & DMZ_ALLOC_RECLAIM)) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2215 | return NULL; |
Hannes Reinecke | 22c1ef6 | 2020-06-02 13:09:53 +0200 | [diff] [blame] | 2216 | /* |
| 2217 | * Try to allocate from other devices |
| 2218 | */ |
| 2219 | if (i < zmd->nr_devs) { |
| 2220 | dev_idx = (dev_idx + 1) % zmd->nr_devs; |
| 2221 | i++; |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2222 | goto again; |
| 2223 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2224 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2225 | /* |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2226 | * Fallback to the reserved sequential zones |
| 2227 | */ |
| 2228 | zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list, |
| 2229 | struct dm_zone, link); |
| 2230 | if (zone) { |
| 2231 | list_del_init(&zone->link); |
| 2232 | atomic_dec(&zmd->nr_reserved_seq_zones); |
| 2233 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2234 | return zone; |
| 2235 | } |
| 2236 | |
| 2237 | zone = list_first_entry(list, struct dm_zone, link); |
| 2238 | list_del_init(&zone->link); |
| 2239 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2240 | if (dmz_is_cache(zone)) |
| 2241 | atomic_dec(&zmd->unmap_nr_cache); |
| 2242 | else if (dmz_is_rnd(zone)) |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2243 | atomic_dec(&zone->dev->unmap_nr_rnd); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2244 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2245 | atomic_dec(&zone->dev->unmap_nr_seq); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2246 | |
| 2247 | if (dmz_is_offline(zone)) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2248 | dmz_zmd_warn(zmd, "Zone %u is offline", zone->id); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2249 | zone = NULL; |
| 2250 | goto again; |
| 2251 | } |
Hannes Reinecke | dc076c8 | 2020-05-11 10:24:29 +0200 | [diff] [blame] | 2252 | if (dmz_is_meta(zone)) { |
Hannes Reinecke | 8f22272 | 2020-06-02 13:09:48 +0200 | [diff] [blame] | 2253 | dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id); |
Hannes Reinecke | dc076c8 | 2020-05-11 10:24:29 +0200 | [diff] [blame] | 2254 | zone = NULL; |
| 2255 | goto again; |
| 2256 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2257 | return zone; |
| 2258 | } |
| 2259 | |
| 2260 | /* |
| 2261 | * Free a zone. |
| 2262 | * This must be called with the mapping lock held. |
| 2263 | */ |
| 2264 | void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 2265 | { |
| 2266 | /* If this is a sequential zone, reset it */ |
| 2267 | if (dmz_is_seq(zone)) |
| 2268 | dmz_reset_zone(zmd, zone); |
| 2269 | |
| 2270 | /* Return the zone to its type unmap list */ |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2271 | if (dmz_is_cache(zone)) { |
| 2272 | list_add_tail(&zone->link, &zmd->unmap_cache_list); |
| 2273 | atomic_inc(&zmd->unmap_nr_cache); |
| 2274 | } else if (dmz_is_rnd(zone)) { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2275 | list_add_tail(&zone->link, &zone->dev->unmap_rnd_list); |
| 2276 | atomic_inc(&zone->dev->unmap_nr_rnd); |
Hannes Reinecke | aec67b4 | 2020-06-02 13:09:45 +0200 | [diff] [blame] | 2277 | } else if (dmz_is_reserved(zone)) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2278 | list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); |
| 2279 | atomic_inc(&zmd->nr_reserved_seq_zones); |
| 2280 | } else { |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2281 | list_add_tail(&zone->link, &zone->dev->unmap_seq_list); |
| 2282 | atomic_inc(&zone->dev->unmap_nr_seq); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2283 | } |
| 2284 | |
| 2285 | wake_up_all(&zmd->free_wq); |
| 2286 | } |
| 2287 | |
| 2288 | /* |
| 2289 | * Map a chunk to a zone. |
| 2290 | * This must be called with the mapping lock held. |
| 2291 | */ |
| 2292 | void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, |
| 2293 | unsigned int chunk) |
| 2294 | { |
| 2295 | /* Set the chunk mapping */ |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2296 | dmz_set_chunk_mapping(zmd, chunk, dzone->id, |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2297 | DMZ_MAP_UNMAPPED); |
| 2298 | dzone->chunk = chunk; |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2299 | if (dmz_is_cache(dzone)) |
| 2300 | list_add_tail(&dzone->link, &zmd->map_cache_list); |
| 2301 | else if (dmz_is_rnd(dzone)) |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2302 | list_add_tail(&dzone->link, &dzone->dev->map_rnd_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2303 | else |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2304 | list_add_tail(&dzone->link, &dzone->dev->map_seq_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2305 | } |
| 2306 | |
| 2307 | /* |
| 2308 | * Unmap a zone. |
| 2309 | * This must be called with the mapping lock held. |
| 2310 | */ |
| 2311 | void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 2312 | { |
| 2313 | unsigned int chunk = zone->chunk; |
| 2314 | unsigned int dzone_id; |
| 2315 | |
| 2316 | if (chunk == DMZ_MAP_UNMAPPED) { |
| 2317 | /* Already unmapped */ |
| 2318 | return; |
| 2319 | } |
| 2320 | |
| 2321 | if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { |
| 2322 | /* |
| 2323 | * Unmapping the chunk buffer zone: clear only |
| 2324 | * the chunk buffer mapping |
| 2325 | */ |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2326 | dzone_id = zone->bzone->id; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2327 | zone->bzone->bzone = NULL; |
| 2328 | zone->bzone = NULL; |
| 2329 | |
| 2330 | } else { |
| 2331 | /* |
| 2332 | * Unmapping the chunk data zone: the zone must |
| 2333 | * not be buffered. |
| 2334 | */ |
| 2335 | if (WARN_ON(zone->bzone)) { |
| 2336 | zone->bzone->bzone = NULL; |
| 2337 | zone->bzone = NULL; |
| 2338 | } |
| 2339 | dzone_id = DMZ_MAP_UNMAPPED; |
| 2340 | } |
| 2341 | |
| 2342 | dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); |
| 2343 | |
| 2344 | zone->chunk = DMZ_MAP_UNMAPPED; |
| 2345 | list_del_init(&zone->link); |
| 2346 | } |
| 2347 | |
| 2348 | /* |
| 2349 | * Set @nr_bits bits in @bitmap starting from @bit. |
| 2350 | * Return the number of bits changed from 0 to 1. |
| 2351 | */ |
| 2352 | static unsigned int dmz_set_bits(unsigned long *bitmap, |
| 2353 | unsigned int bit, unsigned int nr_bits) |
| 2354 | { |
| 2355 | unsigned long *addr; |
| 2356 | unsigned int end = bit + nr_bits; |
| 2357 | unsigned int n = 0; |
| 2358 | |
| 2359 | while (bit < end) { |
| 2360 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 2361 | ((end - bit) >= BITS_PER_LONG)) { |
| 2362 | /* Try to set the whole word at once */ |
| 2363 | addr = bitmap + BIT_WORD(bit); |
| 2364 | if (*addr == 0) { |
| 2365 | *addr = ULONG_MAX; |
| 2366 | n += BITS_PER_LONG; |
| 2367 | bit += BITS_PER_LONG; |
| 2368 | continue; |
| 2369 | } |
| 2370 | } |
| 2371 | |
| 2372 | if (!test_and_set_bit(bit, bitmap)) |
| 2373 | n++; |
| 2374 | bit++; |
| 2375 | } |
| 2376 | |
| 2377 | return n; |
| 2378 | } |
| 2379 | |
| 2380 | /* |
| 2381 | * Get the bitmap block storing the bit for chunk_block in zone. |
| 2382 | */ |
| 2383 | static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, |
| 2384 | struct dm_zone *zone, |
| 2385 | sector_t chunk_block) |
| 2386 | { |
| 2387 | sector_t bitmap_block = 1 + zmd->nr_map_blocks + |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2388 | (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) + |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2389 | (chunk_block >> DMZ_BLOCK_SHIFT_BITS); |
| 2390 | |
| 2391 | return dmz_get_mblock(zmd, bitmap_block); |
| 2392 | } |
| 2393 | |
| 2394 | /* |
| 2395 | * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. |
| 2396 | */ |
| 2397 | int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, |
| 2398 | struct dm_zone *to_zone) |
| 2399 | { |
| 2400 | struct dmz_mblock *from_mblk, *to_mblk; |
| 2401 | sector_t chunk_block = 0; |
| 2402 | |
| 2403 | /* Get the zones bitmap blocks */ |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2404 | while (chunk_block < zmd->zone_nr_blocks) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2405 | from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); |
| 2406 | if (IS_ERR(from_mblk)) |
| 2407 | return PTR_ERR(from_mblk); |
| 2408 | to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); |
| 2409 | if (IS_ERR(to_mblk)) { |
| 2410 | dmz_release_mblock(zmd, from_mblk); |
| 2411 | return PTR_ERR(to_mblk); |
| 2412 | } |
| 2413 | |
| 2414 | memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); |
| 2415 | dmz_dirty_mblock(zmd, to_mblk); |
| 2416 | |
| 2417 | dmz_release_mblock(zmd, to_mblk); |
| 2418 | dmz_release_mblock(zmd, from_mblk); |
| 2419 | |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2420 | chunk_block += zmd->zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2421 | } |
| 2422 | |
| 2423 | to_zone->weight = from_zone->weight; |
| 2424 | |
| 2425 | return 0; |
| 2426 | } |
| 2427 | |
| 2428 | /* |
| 2429 | * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, |
| 2430 | * starting from chunk_block. |
| 2431 | */ |
| 2432 | int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, |
| 2433 | struct dm_zone *to_zone, sector_t chunk_block) |
| 2434 | { |
| 2435 | unsigned int nr_blocks; |
| 2436 | int ret; |
| 2437 | |
| 2438 | /* Get the zones bitmap blocks */ |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2439 | while (chunk_block < zmd->zone_nr_blocks) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2440 | /* Get a valid region from the source zone */ |
| 2441 | ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); |
| 2442 | if (ret <= 0) |
| 2443 | return ret; |
| 2444 | |
| 2445 | nr_blocks = ret; |
| 2446 | ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); |
| 2447 | if (ret) |
| 2448 | return ret; |
| 2449 | |
| 2450 | chunk_block += nr_blocks; |
| 2451 | } |
| 2452 | |
| 2453 | return 0; |
| 2454 | } |
| 2455 | |
| 2456 | /* |
| 2457 | * Validate all the blocks in the range [block..block+nr_blocks-1]. |
| 2458 | */ |
| 2459 | int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2460 | sector_t chunk_block, unsigned int nr_blocks) |
| 2461 | { |
| 2462 | unsigned int count, bit, nr_bits; |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2463 | unsigned int zone_nr_blocks = zmd->zone_nr_blocks; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2464 | struct dmz_mblock *mblk; |
| 2465 | unsigned int n = 0; |
| 2466 | |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2467 | dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2468 | zone->id, (unsigned long long)chunk_block, |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2469 | nr_blocks); |
| 2470 | |
| 2471 | WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); |
| 2472 | |
| 2473 | while (nr_blocks) { |
| 2474 | /* Get bitmap block */ |
| 2475 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2476 | if (IS_ERR(mblk)) |
| 2477 | return PTR_ERR(mblk); |
| 2478 | |
| 2479 | /* Set bits */ |
| 2480 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2481 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2482 | |
| 2483 | count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); |
| 2484 | if (count) { |
| 2485 | dmz_dirty_mblock(zmd, mblk); |
| 2486 | n += count; |
| 2487 | } |
| 2488 | dmz_release_mblock(zmd, mblk); |
| 2489 | |
| 2490 | nr_blocks -= nr_bits; |
| 2491 | chunk_block += nr_bits; |
| 2492 | } |
| 2493 | |
| 2494 | if (likely(zone->weight + n <= zone_nr_blocks)) |
| 2495 | zone->weight += n; |
| 2496 | else { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2497 | dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2498 | zone->id, zone->weight, |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2499 | zone_nr_blocks - n); |
| 2500 | zone->weight = zone_nr_blocks; |
| 2501 | } |
| 2502 | |
| 2503 | return 0; |
| 2504 | } |
| 2505 | |
| 2506 | /* |
| 2507 | * Clear nr_bits bits in bitmap starting from bit. |
| 2508 | * Return the number of bits cleared. |
| 2509 | */ |
| 2510 | static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) |
| 2511 | { |
| 2512 | unsigned long *addr; |
| 2513 | int end = bit + nr_bits; |
| 2514 | int n = 0; |
| 2515 | |
| 2516 | while (bit < end) { |
| 2517 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 2518 | ((end - bit) >= BITS_PER_LONG)) { |
| 2519 | /* Try to clear whole word at once */ |
| 2520 | addr = bitmap + BIT_WORD(bit); |
| 2521 | if (*addr == ULONG_MAX) { |
| 2522 | *addr = 0; |
| 2523 | n += BITS_PER_LONG; |
| 2524 | bit += BITS_PER_LONG; |
| 2525 | continue; |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | if (test_and_clear_bit(bit, bitmap)) |
| 2530 | n++; |
| 2531 | bit++; |
| 2532 | } |
| 2533 | |
| 2534 | return n; |
| 2535 | } |
| 2536 | |
| 2537 | /* |
| 2538 | * Invalidate all the blocks in the range [block..block+nr_blocks-1]. |
| 2539 | */ |
| 2540 | int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2541 | sector_t chunk_block, unsigned int nr_blocks) |
| 2542 | { |
| 2543 | unsigned int count, bit, nr_bits; |
| 2544 | struct dmz_mblock *mblk; |
| 2545 | unsigned int n = 0; |
| 2546 | |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2547 | dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2548 | zone->id, (u64)chunk_block, nr_blocks); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2549 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2550 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2551 | |
| 2552 | while (nr_blocks) { |
| 2553 | /* Get bitmap block */ |
| 2554 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2555 | if (IS_ERR(mblk)) |
| 2556 | return PTR_ERR(mblk); |
| 2557 | |
| 2558 | /* Clear bits */ |
| 2559 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2560 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2561 | |
| 2562 | count = dmz_clear_bits((unsigned long *)mblk->data, |
| 2563 | bit, nr_bits); |
| 2564 | if (count) { |
| 2565 | dmz_dirty_mblock(zmd, mblk); |
| 2566 | n += count; |
| 2567 | } |
| 2568 | dmz_release_mblock(zmd, mblk); |
| 2569 | |
| 2570 | nr_blocks -= nr_bits; |
| 2571 | chunk_block += nr_bits; |
| 2572 | } |
| 2573 | |
| 2574 | if (zone->weight >= n) |
| 2575 | zone->weight -= n; |
| 2576 | else { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2577 | dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u", |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2578 | zone->id, zone->weight, n); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2579 | zone->weight = 0; |
| 2580 | } |
| 2581 | |
| 2582 | return 0; |
| 2583 | } |
| 2584 | |
| 2585 | /* |
| 2586 | * Get a block bit value. |
| 2587 | */ |
| 2588 | static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2589 | sector_t chunk_block) |
| 2590 | { |
| 2591 | struct dmz_mblock *mblk; |
| 2592 | int ret; |
| 2593 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2594 | WARN_ON(chunk_block >= zmd->zone_nr_blocks); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2595 | |
| 2596 | /* Get bitmap block */ |
| 2597 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2598 | if (IS_ERR(mblk)) |
| 2599 | return PTR_ERR(mblk); |
| 2600 | |
| 2601 | /* Get offset */ |
| 2602 | ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, |
| 2603 | (unsigned long *) mblk->data) != 0; |
| 2604 | |
| 2605 | dmz_release_mblock(zmd, mblk); |
| 2606 | |
| 2607 | return ret; |
| 2608 | } |
| 2609 | |
| 2610 | /* |
| 2611 | * Return the number of blocks from chunk_block to the first block with a bit |
| 2612 | * value specified by set. Search at most nr_blocks blocks from chunk_block. |
| 2613 | */ |
| 2614 | static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2615 | sector_t chunk_block, unsigned int nr_blocks, |
| 2616 | int set) |
| 2617 | { |
| 2618 | struct dmz_mblock *mblk; |
| 2619 | unsigned int bit, set_bit, nr_bits; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2620 | unsigned int zone_bits = zmd->zone_bits_per_mblk; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2621 | unsigned long *bitmap; |
| 2622 | int n = 0; |
| 2623 | |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2624 | WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2625 | |
| 2626 | while (nr_blocks) { |
| 2627 | /* Get bitmap block */ |
| 2628 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2629 | if (IS_ERR(mblk)) |
| 2630 | return PTR_ERR(mblk); |
| 2631 | |
| 2632 | /* Get offset */ |
| 2633 | bitmap = (unsigned long *) mblk->data; |
| 2634 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2635 | nr_bits = min(nr_blocks, zone_bits - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2636 | if (set) |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2637 | set_bit = find_next_bit(bitmap, zone_bits, bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2638 | else |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2639 | set_bit = find_next_zero_bit(bitmap, zone_bits, bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2640 | dmz_release_mblock(zmd, mblk); |
| 2641 | |
| 2642 | n += set_bit - bit; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2643 | if (set_bit < zone_bits) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2644 | break; |
| 2645 | |
| 2646 | nr_blocks -= nr_bits; |
| 2647 | chunk_block += nr_bits; |
| 2648 | } |
| 2649 | |
| 2650 | return n; |
| 2651 | } |
| 2652 | |
| 2653 | /* |
| 2654 | * Test if chunk_block is valid. If it is, the number of consecutive |
| 2655 | * valid blocks from chunk_block will be returned. |
| 2656 | */ |
| 2657 | int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2658 | sector_t chunk_block) |
| 2659 | { |
| 2660 | int valid; |
| 2661 | |
| 2662 | valid = dmz_test_block(zmd, zone, chunk_block); |
| 2663 | if (valid <= 0) |
| 2664 | return valid; |
| 2665 | |
| 2666 | /* The block is valid: get the number of valid blocks from block */ |
| 2667 | return dmz_to_next_set_block(zmd, zone, chunk_block, |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2668 | zmd->zone_nr_blocks - chunk_block, 0); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2669 | } |
| 2670 | |
| 2671 | /* |
| 2672 | * Find the first valid block from @chunk_block in @zone. |
| 2673 | * If such a block is found, its number is returned using |
| 2674 | * @chunk_block and the total number of valid blocks from @chunk_block |
| 2675 | * is returned. |
| 2676 | */ |
| 2677 | int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, |
| 2678 | sector_t *chunk_block) |
| 2679 | { |
| 2680 | sector_t start_block = *chunk_block; |
| 2681 | int ret; |
| 2682 | |
| 2683 | ret = dmz_to_next_set_block(zmd, zone, start_block, |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2684 | zmd->zone_nr_blocks - start_block, 1); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2685 | if (ret < 0) |
| 2686 | return ret; |
| 2687 | |
| 2688 | start_block += ret; |
| 2689 | *chunk_block = start_block; |
| 2690 | |
| 2691 | return dmz_to_next_set_block(zmd, zone, start_block, |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2692 | zmd->zone_nr_blocks - start_block, 0); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2693 | } |
| 2694 | |
| 2695 | /* |
| 2696 | * Count the number of bits set starting from bit up to bit + nr_bits - 1. |
| 2697 | */ |
| 2698 | static int dmz_count_bits(void *bitmap, int bit, int nr_bits) |
| 2699 | { |
| 2700 | unsigned long *addr; |
| 2701 | int end = bit + nr_bits; |
| 2702 | int n = 0; |
| 2703 | |
| 2704 | while (bit < end) { |
| 2705 | if (((bit & (BITS_PER_LONG - 1)) == 0) && |
| 2706 | ((end - bit) >= BITS_PER_LONG)) { |
| 2707 | addr = (unsigned long *)bitmap + BIT_WORD(bit); |
| 2708 | if (*addr == ULONG_MAX) { |
| 2709 | n += BITS_PER_LONG; |
| 2710 | bit += BITS_PER_LONG; |
| 2711 | continue; |
| 2712 | } |
| 2713 | } |
| 2714 | |
| 2715 | if (test_bit(bit, bitmap)) |
| 2716 | n++; |
| 2717 | bit++; |
| 2718 | } |
| 2719 | |
| 2720 | return n; |
| 2721 | } |
| 2722 | |
| 2723 | /* |
| 2724 | * Get a zone weight. |
| 2725 | */ |
| 2726 | static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) |
| 2727 | { |
| 2728 | struct dmz_mblock *mblk; |
| 2729 | sector_t chunk_block = 0; |
| 2730 | unsigned int bit, nr_bits; |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2731 | unsigned int nr_blocks = zmd->zone_nr_blocks; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2732 | void *bitmap; |
| 2733 | int n = 0; |
| 2734 | |
| 2735 | while (nr_blocks) { |
| 2736 | /* Get bitmap block */ |
| 2737 | mblk = dmz_get_bitmap(zmd, zone, chunk_block); |
| 2738 | if (IS_ERR(mblk)) { |
| 2739 | n = 0; |
| 2740 | break; |
| 2741 | } |
| 2742 | |
| 2743 | /* Count bits in this block */ |
| 2744 | bitmap = mblk->data; |
| 2745 | bit = chunk_block & DMZ_BLOCK_MASK_BITS; |
Dmitry Fomichev | b399629 | 2019-12-23 17:05:46 -0800 | [diff] [blame] | 2746 | nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2747 | n += dmz_count_bits(bitmap, bit, nr_bits); |
| 2748 | |
| 2749 | dmz_release_mblock(zmd, mblk); |
| 2750 | |
| 2751 | nr_blocks -= nr_bits; |
| 2752 | chunk_block += nr_bits; |
| 2753 | } |
| 2754 | |
| 2755 | zone->weight = n; |
| 2756 | } |
| 2757 | |
| 2758 | /* |
| 2759 | * Cleanup the zoned metadata resources. |
| 2760 | */ |
| 2761 | static void dmz_cleanup_metadata(struct dmz_metadata *zmd) |
| 2762 | { |
| 2763 | struct rb_root *root; |
| 2764 | struct dmz_mblock *mblk, *next; |
| 2765 | int i; |
| 2766 | |
| 2767 | /* Release zone mapping resources */ |
| 2768 | if (zmd->map_mblk) { |
| 2769 | for (i = 0; i < zmd->nr_map_blocks; i++) |
| 2770 | dmz_release_mblock(zmd, zmd->map_mblk[i]); |
| 2771 | kfree(zmd->map_mblk); |
| 2772 | zmd->map_mblk = NULL; |
| 2773 | } |
| 2774 | |
| 2775 | /* Release super blocks */ |
| 2776 | for (i = 0; i < 2; i++) { |
| 2777 | if (zmd->sb[i].mblk) { |
| 2778 | dmz_free_mblock(zmd, zmd->sb[i].mblk); |
| 2779 | zmd->sb[i].mblk = NULL; |
| 2780 | } |
| 2781 | } |
| 2782 | |
| 2783 | /* Free cached blocks */ |
| 2784 | while (!list_empty(&zmd->mblk_dirty_list)) { |
| 2785 | mblk = list_first_entry(&zmd->mblk_dirty_list, |
| 2786 | struct dmz_mblock, link); |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2787 | dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)", |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 2788 | (u64)mblk->no, mblk->ref); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2789 | list_del_init(&mblk->link); |
| 2790 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 2791 | dmz_free_mblock(zmd, mblk); |
| 2792 | } |
| 2793 | |
| 2794 | while (!list_empty(&zmd->mblk_lru_list)) { |
| 2795 | mblk = list_first_entry(&zmd->mblk_lru_list, |
| 2796 | struct dmz_mblock, link); |
| 2797 | list_del_init(&mblk->link); |
| 2798 | rb_erase(&mblk->node, &zmd->mblk_rbtree); |
| 2799 | dmz_free_mblock(zmd, mblk); |
| 2800 | } |
| 2801 | |
| 2802 | /* Sanity checks: the mblock rbtree should now be empty */ |
| 2803 | root = &zmd->mblk_rbtree; |
| 2804 | rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2805 | dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree", |
Damien Le Moal | 33c2865 | 2018-10-17 18:05:07 +0900 | [diff] [blame] | 2806 | (u64)mblk->no, mblk->ref); |
| 2807 | mblk->ref = 0; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2808 | dmz_free_mblock(zmd, mblk); |
| 2809 | } |
| 2810 | |
| 2811 | /* Free the zone descriptors */ |
| 2812 | dmz_drop_zones(zmd); |
Mike Snitzer | d5ffebd | 2018-01-05 21:17:20 -0500 | [diff] [blame] | 2813 | |
| 2814 | mutex_destroy(&zmd->mblk_flush_lock); |
| 2815 | mutex_destroy(&zmd->map_lock); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2816 | } |
| 2817 | |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2818 | static void dmz_print_dev(struct dmz_metadata *zmd, int num) |
| 2819 | { |
| 2820 | struct dmz_dev *dev = &zmd->dev[num]; |
| 2821 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2822 | if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) |
| 2823 | dmz_dev_info(dev, "Regular block device"); |
| 2824 | else |
| 2825 | dmz_dev_info(dev, "Host-%s zoned block device", |
| 2826 | bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? |
| 2827 | "aware" : "managed"); |
| 2828 | if (zmd->sb_version > 1) { |
| 2829 | sector_t sector_offset = |
| 2830 | dev->zone_offset << zmd->zone_nr_sectors_shift; |
| 2831 | |
| 2832 | dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)", |
| 2833 | (u64)dev->capacity, (u64)sector_offset); |
| 2834 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)", |
| 2835 | dev->nr_zones, (u64)zmd->zone_nr_sectors, |
| 2836 | (u64)dev->zone_offset); |
| 2837 | } else { |
| 2838 | dmz_dev_info(dev, " %llu 512-byte logical sectors", |
| 2839 | (u64)dev->capacity); |
| 2840 | dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", |
| 2841 | dev->nr_zones, (u64)zmd->zone_nr_sectors); |
| 2842 | } |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2843 | } |
| 2844 | |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2845 | /* |
| 2846 | * Initialize the zoned metadata. |
| 2847 | */ |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2848 | int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, |
| 2849 | struct dmz_metadata **metadata, |
Hannes Reinecke | 2234e73 | 2020-05-11 10:24:22 +0200 | [diff] [blame] | 2850 | const char *devname) |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2851 | { |
| 2852 | struct dmz_metadata *zmd; |
Hannes Reinecke | b712287 | 2020-05-11 10:24:18 +0200 | [diff] [blame] | 2853 | unsigned int i; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2854 | struct dm_zone *zone; |
| 2855 | int ret; |
| 2856 | |
| 2857 | zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); |
| 2858 | if (!zmd) |
| 2859 | return -ENOMEM; |
| 2860 | |
Hannes Reinecke | 2234e73 | 2020-05-11 10:24:22 +0200 | [diff] [blame] | 2861 | strcpy(zmd->devname, devname); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2862 | zmd->dev = dev; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2863 | zmd->nr_devs = num_dev; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2864 | zmd->mblk_rbtree = RB_ROOT; |
| 2865 | init_rwsem(&zmd->mblk_sem); |
| 2866 | mutex_init(&zmd->mblk_flush_lock); |
| 2867 | spin_lock_init(&zmd->mblk_lock); |
| 2868 | INIT_LIST_HEAD(&zmd->mblk_lru_list); |
| 2869 | INIT_LIST_HEAD(&zmd->mblk_dirty_list); |
| 2870 | |
| 2871 | mutex_init(&zmd->map_lock); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2872 | |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2873 | atomic_set(&zmd->unmap_nr_cache, 0); |
| 2874 | INIT_LIST_HEAD(&zmd->unmap_cache_list); |
| 2875 | INIT_LIST_HEAD(&zmd->map_cache_list); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2876 | |
| 2877 | atomic_set(&zmd->nr_reserved_seq_zones, 0); |
| 2878 | INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); |
| 2879 | |
| 2880 | init_waitqueue_head(&zmd->free_wq); |
| 2881 | |
| 2882 | /* Initialize zone descriptors */ |
| 2883 | ret = dmz_init_zones(zmd); |
| 2884 | if (ret) |
| 2885 | goto err; |
| 2886 | |
| 2887 | /* Get super block */ |
| 2888 | ret = dmz_load_sb(zmd); |
| 2889 | if (ret) |
| 2890 | goto err; |
| 2891 | |
| 2892 | /* Set metadata zones starting from sb_zone */ |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2893 | for (i = 0; i < zmd->nr_meta_zones << 1; i++) { |
Hannes Reinecke | 735bd7e4 | 2020-05-11 10:24:19 +0200 | [diff] [blame] | 2894 | zone = dmz_get(zmd, zmd->sb[0].zone->id + i); |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 2895 | if (!zone) { |
| 2896 | dmz_zmd_err(zmd, |
| 2897 | "metadata zone %u not present", i); |
| 2898 | ret = -ENXIO; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2899 | goto err; |
Hannes Reinecke | a92fbc4 | 2020-06-02 13:09:46 +0200 | [diff] [blame] | 2900 | } |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2901 | if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) { |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2902 | dmz_zmd_err(zmd, |
| 2903 | "metadata zone %d is not random", i); |
| 2904 | ret = -ENXIO; |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2905 | goto err; |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2906 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2907 | set_bit(DMZ_META, &zone->flags); |
| 2908 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2909 | /* Load mapping table */ |
| 2910 | ret = dmz_load_mapping(zmd); |
| 2911 | if (ret) |
| 2912 | goto err; |
| 2913 | |
| 2914 | /* |
| 2915 | * Cache size boundaries: allow at least 2 super blocks, the chunk map |
| 2916 | * blocks and enough blocks to be able to cache the bitmap blocks of |
| 2917 | * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow |
| 2918 | * the cache to add 512 more metadata blocks. |
| 2919 | */ |
| 2920 | zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; |
| 2921 | zmd->max_nr_mblks = zmd->min_nr_mblks + 512; |
| 2922 | zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; |
| 2923 | zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; |
| 2924 | zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; |
| 2925 | |
| 2926 | /* Metadata cache shrinker */ |
| 2927 | ret = register_shrinker(&zmd->mblk_shrinker); |
| 2928 | if (ret) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2929 | dmz_zmd_err(zmd, "Register metadata cache shrinker failed"); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2930 | goto err; |
| 2931 | } |
| 2932 | |
Hannes Reinecke | bd5c403 | 2020-05-11 10:24:30 +0200 | [diff] [blame] | 2933 | dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version); |
| 2934 | for (i = 0; i < zmd->nr_devs; i++) |
| 2935 | dmz_print_dev(zmd, i); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2936 | |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2937 | dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors", |
| 2938 | zmd->nr_zones, (u64)zmd->zone_nr_sectors); |
Hannes Reinecke | ae3c1f1 | 2020-05-11 10:24:28 +0200 | [diff] [blame] | 2939 | dmz_zmd_debug(zmd, " %u metadata zones", |
| 2940 | zmd->nr_meta_zones * 2); |
| 2941 | dmz_zmd_debug(zmd, " %u data zones for %u chunks", |
| 2942 | zmd->nr_data_zones, zmd->nr_chunks); |
Hannes Reinecke | 34f5aff | 2020-05-19 10:14:20 +0200 | [diff] [blame] | 2943 | dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)", |
| 2944 | zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache)); |
Hannes Reinecke | bd82fda | 2020-06-02 13:09:51 +0200 | [diff] [blame] | 2945 | for (i = 0; i < zmd->nr_devs; i++) { |
| 2946 | dmz_zmd_debug(zmd, " %u random zones (%u unmapped)", |
| 2947 | dmz_nr_rnd_zones(zmd, i), |
| 2948 | dmz_nr_unmap_rnd_zones(zmd, i)); |
| 2949 | dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)", |
| 2950 | dmz_nr_seq_zones(zmd, i), |
| 2951 | dmz_nr_unmap_seq_zones(zmd, i)); |
| 2952 | } |
Hannes Reinecke | ae3c1f1 | 2020-05-11 10:24:28 +0200 | [diff] [blame] | 2953 | dmz_zmd_debug(zmd, " %u reserved sequential data zones", |
| 2954 | zmd->nr_reserved_seq); |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2955 | dmz_zmd_debug(zmd, "Format:"); |
| 2956 | dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2957 | zmd->nr_meta_blocks, zmd->max_nr_mblks); |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2958 | dmz_zmd_debug(zmd, " %u data zone mapping blocks", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2959 | zmd->nr_map_blocks); |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2960 | dmz_zmd_debug(zmd, " %u bitmap blocks", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2961 | zmd->nr_bitmap_blocks); |
| 2962 | |
| 2963 | *metadata = zmd; |
| 2964 | |
| 2965 | return 0; |
| 2966 | err: |
| 2967 | dmz_cleanup_metadata(zmd); |
| 2968 | kfree(zmd); |
| 2969 | *metadata = NULL; |
| 2970 | |
| 2971 | return ret; |
| 2972 | } |
| 2973 | |
| 2974 | /* |
| 2975 | * Cleanup the zoned metadata resources. |
| 2976 | */ |
| 2977 | void dmz_dtr_metadata(struct dmz_metadata *zmd) |
| 2978 | { |
| 2979 | unregister_shrinker(&zmd->mblk_shrinker); |
| 2980 | dmz_cleanup_metadata(zmd); |
| 2981 | kfree(zmd); |
| 2982 | } |
| 2983 | |
| 2984 | /* |
| 2985 | * Check zone information on resume. |
| 2986 | */ |
| 2987 | int dmz_resume_metadata(struct dmz_metadata *zmd) |
| 2988 | { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2989 | struct dm_zone *zone; |
| 2990 | sector_t wp_block; |
| 2991 | unsigned int i; |
| 2992 | int ret; |
| 2993 | |
| 2994 | /* Check zones */ |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 2995 | for (i = 0; i < zmd->nr_zones; i++) { |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2996 | zone = dmz_get(zmd, i); |
| 2997 | if (!zone) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 2998 | dmz_zmd_err(zmd, "Unable to get zone %u", i); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 2999 | return -EIO; |
| 3000 | } |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 3001 | wp_block = zone->wp_block; |
| 3002 | |
| 3003 | ret = dmz_update_zone(zmd, zone); |
| 3004 | if (ret) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 3005 | dmz_zmd_err(zmd, "Broken zone %u", i); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 3006 | return ret; |
| 3007 | } |
| 3008 | |
| 3009 | if (dmz_is_offline(zone)) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 3010 | dmz_zmd_warn(zmd, "Zone %u is offline", i); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 3011 | continue; |
| 3012 | } |
| 3013 | |
| 3014 | /* Check write pointer */ |
| 3015 | if (!dmz_is_seq(zone)) |
| 3016 | zone->wp_block = 0; |
| 3017 | else if (zone->wp_block != wp_block) { |
Hannes Reinecke | ca1a704 | 2020-05-11 10:24:27 +0200 | [diff] [blame] | 3018 | dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)", |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 3019 | i, (u64)zone->wp_block, (u64)wp_block); |
| 3020 | zone->wp_block = wp_block; |
| 3021 | dmz_invalidate_blocks(zmd, zone, zone->wp_block, |
Hannes Reinecke | 3682056 | 2020-05-11 10:24:21 +0200 | [diff] [blame] | 3022 | zmd->zone_nr_blocks - zone->wp_block); |
Damien Le Moal | 3b1a94c | 2017-06-07 15:55:39 +0900 | [diff] [blame] | 3023 | } |
| 3024 | } |
| 3025 | |
| 3026 | return 0; |
| 3027 | } |