1bae9a0aaSDmitry Fomichev // SPDX-License-Identifier: GPL-2.0-only 23b1a94c8SDamien Le Moal /* 33b1a94c8SDamien Le Moal * Copyright (C) 2017 Western Digital Corporation or its affiliates. 43b1a94c8SDamien Le Moal * 53b1a94c8SDamien Le Moal * This file is released under the GPL. 63b1a94c8SDamien Le Moal */ 73b1a94c8SDamien Le Moal 83b1a94c8SDamien Le Moal #include "dm-zoned.h" 93b1a94c8SDamien Le Moal 103b1a94c8SDamien Le Moal #include <linux/module.h> 113b1a94c8SDamien Le Moal #include <linux/crc32.h> 12bd976e52SDamien Le Moal #include <linux/sched/mm.h> 133b1a94c8SDamien Le Moal 143b1a94c8SDamien Le Moal #define DM_MSG_PREFIX "zoned metadata" 153b1a94c8SDamien Le Moal 163b1a94c8SDamien Le Moal /* 173b1a94c8SDamien Le Moal * Metadata version. 183b1a94c8SDamien Le Moal */ 19bd5c4031SHannes Reinecke #define DMZ_META_VER 2 203b1a94c8SDamien Le Moal 213b1a94c8SDamien Le Moal /* 223b1a94c8SDamien Le Moal * On-disk super block magic. 233b1a94c8SDamien Le Moal */ 243b1a94c8SDamien Le Moal #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ 253b1a94c8SDamien Le Moal (((unsigned int)('Z')) << 16) | \ 263b1a94c8SDamien Le Moal (((unsigned int)('B')) << 8) | \ 273b1a94c8SDamien Le Moal ((unsigned int)('D'))) 283b1a94c8SDamien Le Moal 293b1a94c8SDamien Le Moal /* 303b1a94c8SDamien Le Moal * On disk super block. 313b1a94c8SDamien Le Moal * This uses only 512 B but uses on disk a full 4KB block. This block is 323b1a94c8SDamien Le Moal * followed on disk by the mapping table of chunks to zones and the bitmap 333b1a94c8SDamien Le Moal * blocks indicating zone block validity. 343b1a94c8SDamien Le Moal * The overall resulting metadata format is: 353b1a94c8SDamien Le Moal * (1) Super block (1 block) 363b1a94c8SDamien Le Moal * (2) Chunk mapping table (nr_map_blocks) 373b1a94c8SDamien Le Moal * (3) Bitmap blocks (nr_bitmap_blocks) 38ad1bd578SDmitry Fomichev * All metadata blocks are stored in conventional zones, starting from 393b1a94c8SDamien Le Moal * the first conventional zone found on disk. 403b1a94c8SDamien Le Moal */ 413b1a94c8SDamien Le Moal struct dmz_super { 423b1a94c8SDamien Le Moal /* Magic number */ 433b1a94c8SDamien Le Moal __le32 magic; /* 4 */ 443b1a94c8SDamien Le Moal 453b1a94c8SDamien Le Moal /* Metadata version number */ 463b1a94c8SDamien Le Moal __le32 version; /* 8 */ 473b1a94c8SDamien Le Moal 483b1a94c8SDamien Le Moal /* Generation number */ 493b1a94c8SDamien Le Moal __le64 gen; /* 16 */ 503b1a94c8SDamien Le Moal 513b1a94c8SDamien Le Moal /* This block number */ 523b1a94c8SDamien Le Moal __le64 sb_block; /* 24 */ 533b1a94c8SDamien Le Moal 543b1a94c8SDamien Le Moal /* The number of metadata blocks, including this super block */ 553b1a94c8SDamien Le Moal __le32 nr_meta_blocks; /* 28 */ 563b1a94c8SDamien Le Moal 573b1a94c8SDamien Le Moal /* The number of sequential zones reserved for reclaim */ 583b1a94c8SDamien Le Moal __le32 nr_reserved_seq; /* 32 */ 593b1a94c8SDamien Le Moal 603b1a94c8SDamien Le Moal /* The number of entries in the mapping table */ 613b1a94c8SDamien Le Moal __le32 nr_chunks; /* 36 */ 623b1a94c8SDamien Le Moal 633b1a94c8SDamien Le Moal /* The number of blocks used for the chunk mapping table */ 643b1a94c8SDamien Le Moal __le32 nr_map_blocks; /* 40 */ 653b1a94c8SDamien Le Moal 663b1a94c8SDamien Le Moal /* The number of blocks used for the block bitmaps */ 673b1a94c8SDamien Le Moal __le32 nr_bitmap_blocks; /* 44 */ 683b1a94c8SDamien Le Moal 693b1a94c8SDamien Le Moal /* Checksum */ 703b1a94c8SDamien Le Moal __le32 crc; /* 48 */ 713b1a94c8SDamien Le Moal 72bd5c4031SHannes Reinecke /* DM-Zoned label */ 73bd5c4031SHannes Reinecke u8 dmz_label[32]; /* 80 */ 74bd5c4031SHannes Reinecke 75bd5c4031SHannes Reinecke /* DM-Zoned UUID */ 76bd5c4031SHannes Reinecke u8 dmz_uuid[16]; /* 96 */ 77bd5c4031SHannes Reinecke 78bd5c4031SHannes Reinecke /* Device UUID */ 79bd5c4031SHannes Reinecke u8 dev_uuid[16]; /* 112 */ 80bd5c4031SHannes Reinecke 813b1a94c8SDamien Le Moal /* Padding to full 512B sector */ 82bd5c4031SHannes Reinecke u8 reserved[400]; /* 512 */ 833b1a94c8SDamien Le Moal }; 843b1a94c8SDamien Le Moal 853b1a94c8SDamien Le Moal /* 863b1a94c8SDamien Le Moal * Chunk mapping entry: entries are indexed by chunk number 873b1a94c8SDamien Le Moal * and give the zone ID (dzone_id) mapping the chunk on disk. 883b1a94c8SDamien Le Moal * This zone may be sequential or random. If it is a sequential 893b1a94c8SDamien Le Moal * zone, a second zone (bzone_id) used as a write buffer may 903b1a94c8SDamien Le Moal * also be specified. This second zone will always be a randomly 913b1a94c8SDamien Le Moal * writeable zone. 923b1a94c8SDamien Le Moal */ 933b1a94c8SDamien Le Moal struct dmz_map { 943b1a94c8SDamien Le Moal __le32 dzone_id; 953b1a94c8SDamien Le Moal __le32 bzone_id; 963b1a94c8SDamien Le Moal }; 973b1a94c8SDamien Le Moal 983b1a94c8SDamien Le Moal /* 993b1a94c8SDamien Le Moal * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. 1003b1a94c8SDamien Le Moal */ 1013b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) 1023b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) 1033b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) 1043b1a94c8SDamien Le Moal #define DMZ_MAP_UNMAPPED UINT_MAX 1053b1a94c8SDamien Le Moal 1063b1a94c8SDamien Le Moal /* 1073b1a94c8SDamien Le Moal * Meta data block descriptor (for cached metadata blocks). 1083b1a94c8SDamien Le Moal */ 1093b1a94c8SDamien Le Moal struct dmz_mblock { 1103b1a94c8SDamien Le Moal struct rb_node node; 1113b1a94c8SDamien Le Moal struct list_head link; 1123b1a94c8SDamien Le Moal sector_t no; 11333c2865fSDamien Le Moal unsigned int ref; 1143b1a94c8SDamien Le Moal unsigned long state; 1153b1a94c8SDamien Le Moal struct page *page; 1163b1a94c8SDamien Le Moal void *data; 1173b1a94c8SDamien Le Moal }; 1183b1a94c8SDamien Le Moal 1193b1a94c8SDamien Le Moal /* 1203b1a94c8SDamien Le Moal * Metadata block state flags. 1213b1a94c8SDamien Le Moal */ 1223b1a94c8SDamien Le Moal enum { 1233b1a94c8SDamien Le Moal DMZ_META_DIRTY, 1243b1a94c8SDamien Le Moal DMZ_META_READING, 1253b1a94c8SDamien Le Moal DMZ_META_WRITING, 1263b1a94c8SDamien Le Moal DMZ_META_ERROR, 1273b1a94c8SDamien Le Moal }; 1283b1a94c8SDamien Le Moal 1293b1a94c8SDamien Le Moal /* 1303b1a94c8SDamien Le Moal * Super block information (one per metadata set). 1313b1a94c8SDamien Le Moal */ 1323b1a94c8SDamien Le Moal struct dmz_sb { 1333b1a94c8SDamien Le Moal sector_t block; 134bf28a3baSHannes Reinecke struct dmz_dev *dev; 1353b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 1363b1a94c8SDamien Le Moal struct dmz_super *sb; 137735bd7e4SHannes Reinecke struct dm_zone *zone; 1383b1a94c8SDamien Le Moal }; 1393b1a94c8SDamien Le Moal 1403b1a94c8SDamien Le Moal /* 1413b1a94c8SDamien Le Moal * In-memory metadata. 1423b1a94c8SDamien Le Moal */ 1433b1a94c8SDamien Le Moal struct dmz_metadata { 1443b1a94c8SDamien Le Moal struct dmz_dev *dev; 145bd5c4031SHannes Reinecke unsigned int nr_devs; 1463b1a94c8SDamien Le Moal 1472234e732SHannes Reinecke char devname[BDEVNAME_SIZE]; 148bd5c4031SHannes Reinecke char label[BDEVNAME_SIZE]; 149bd5c4031SHannes Reinecke uuid_t uuid; 1502234e732SHannes Reinecke 1513b1a94c8SDamien Le Moal sector_t zone_bitmap_size; 1523b1a94c8SDamien Le Moal unsigned int zone_nr_bitmap_blocks; 153b3996295SDmitry Fomichev unsigned int zone_bits_per_mblk; 1543b1a94c8SDamien Le Moal 15536820560SHannes Reinecke sector_t zone_nr_blocks; 15636820560SHannes Reinecke sector_t zone_nr_blocks_shift; 15736820560SHannes Reinecke 15836820560SHannes Reinecke sector_t zone_nr_sectors; 15936820560SHannes Reinecke sector_t zone_nr_sectors_shift; 16036820560SHannes Reinecke 1613b1a94c8SDamien Le Moal unsigned int nr_bitmap_blocks; 1623b1a94c8SDamien Le Moal unsigned int nr_map_blocks; 1633b1a94c8SDamien Le Moal 16436820560SHannes Reinecke unsigned int nr_zones; 1653b1a94c8SDamien Le Moal unsigned int nr_useable_zones; 1663b1a94c8SDamien Le Moal unsigned int nr_meta_blocks; 1673b1a94c8SDamien Le Moal unsigned int nr_meta_zones; 1683b1a94c8SDamien Le Moal unsigned int nr_data_zones; 16934f5affdSHannes Reinecke unsigned int nr_cache_zones; 1703b1a94c8SDamien Le Moal unsigned int nr_rnd_zones; 1713b1a94c8SDamien Le Moal unsigned int nr_reserved_seq; 1723b1a94c8SDamien Le Moal unsigned int nr_chunks; 1733b1a94c8SDamien Le Moal 1743b1a94c8SDamien Le Moal /* Zone information array */ 175a92fbc44SHannes Reinecke struct xarray zones; 1763b1a94c8SDamien Le Moal 177bd5c4031SHannes Reinecke struct dmz_sb sb[3]; 1783b1a94c8SDamien Le Moal unsigned int mblk_primary; 179bd5c4031SHannes Reinecke unsigned int sb_version; 1803b1a94c8SDamien Le Moal u64 sb_gen; 1813b1a94c8SDamien Le Moal unsigned int min_nr_mblks; 1823b1a94c8SDamien Le Moal unsigned int max_nr_mblks; 1833b1a94c8SDamien Le Moal atomic_t nr_mblks; 1843b1a94c8SDamien Le Moal struct rw_semaphore mblk_sem; 1853b1a94c8SDamien Le Moal struct mutex mblk_flush_lock; 1863b1a94c8SDamien Le Moal spinlock_t mblk_lock; 1873b1a94c8SDamien Le Moal struct rb_root mblk_rbtree; 1883b1a94c8SDamien Le Moal struct list_head mblk_lru_list; 1893b1a94c8SDamien Le Moal struct list_head mblk_dirty_list; 1903b1a94c8SDamien Le Moal struct shrinker mblk_shrinker; 1913b1a94c8SDamien Le Moal 1923b1a94c8SDamien Le Moal /* Zone allocation management */ 1933b1a94c8SDamien Le Moal struct mutex map_lock; 1943b1a94c8SDamien Le Moal struct dmz_mblock **map_mblk; 1953b1a94c8SDamien Le Moal unsigned int nr_rnd; 1963b1a94c8SDamien Le Moal atomic_t unmap_nr_rnd; 1973b1a94c8SDamien Le Moal struct list_head unmap_rnd_list; 1983b1a94c8SDamien Le Moal struct list_head map_rnd_list; 1993b1a94c8SDamien Le Moal 20034f5affdSHannes Reinecke unsigned int nr_cache; 20134f5affdSHannes Reinecke atomic_t unmap_nr_cache; 20234f5affdSHannes Reinecke struct list_head unmap_cache_list; 20334f5affdSHannes Reinecke struct list_head map_cache_list; 20434f5affdSHannes Reinecke 2053b1a94c8SDamien Le Moal unsigned int nr_seq; 2063b1a94c8SDamien Le Moal atomic_t unmap_nr_seq; 2073b1a94c8SDamien Le Moal struct list_head unmap_seq_list; 2083b1a94c8SDamien Le Moal struct list_head map_seq_list; 2093b1a94c8SDamien Le Moal 2103b1a94c8SDamien Le Moal atomic_t nr_reserved_seq_zones; 2113b1a94c8SDamien Le Moal struct list_head reserved_seq_zones_list; 2123b1a94c8SDamien Le Moal 2133b1a94c8SDamien Le Moal wait_queue_head_t free_wq; 2143b1a94c8SDamien Le Moal }; 2153b1a94c8SDamien Le Moal 216ca1a7045SHannes Reinecke #define dmz_zmd_info(zmd, format, args...) \ 217bd5c4031SHannes Reinecke DMINFO("(%s): " format, (zmd)->label, ## args) 218ca1a7045SHannes Reinecke 219ca1a7045SHannes Reinecke #define dmz_zmd_err(zmd, format, args...) \ 220bd5c4031SHannes Reinecke DMERR("(%s): " format, (zmd)->label, ## args) 221ca1a7045SHannes Reinecke 222ca1a7045SHannes Reinecke #define dmz_zmd_warn(zmd, format, args...) \ 223bd5c4031SHannes Reinecke DMWARN("(%s): " format, (zmd)->label, ## args) 224ca1a7045SHannes Reinecke 225ca1a7045SHannes Reinecke #define dmz_zmd_debug(zmd, format, args...) \ 226bd5c4031SHannes Reinecke DMDEBUG("(%s): " format, (zmd)->label, ## args) 2273b1a94c8SDamien Le Moal /* 2283b1a94c8SDamien Le Moal * Various accessors 2293b1a94c8SDamien Le Moal */ 230bd5c4031SHannes Reinecke static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) 231bd5c4031SHannes Reinecke { 232bd5c4031SHannes Reinecke unsigned int zone_id; 233bd5c4031SHannes Reinecke 234bd5c4031SHannes Reinecke if (WARN_ON(!zone)) 235bd5c4031SHannes Reinecke return 0; 236bd5c4031SHannes Reinecke 237bd5c4031SHannes Reinecke zone_id = zone->id; 238bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && 239bd5c4031SHannes Reinecke (zone_id >= zmd->dev[1].zone_offset)) 240bd5c4031SHannes Reinecke zone_id -= zmd->dev[1].zone_offset; 241bd5c4031SHannes Reinecke return zone_id; 242bd5c4031SHannes Reinecke } 243bd5c4031SHannes Reinecke 2443b1a94c8SDamien Le Moal sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) 2453b1a94c8SDamien Le Moal { 246bd5c4031SHannes Reinecke unsigned int zone_id = dmz_dev_zone_id(zmd, zone); 247bd5c4031SHannes Reinecke 248bd5c4031SHannes Reinecke return (sector_t)zone_id << zmd->zone_nr_sectors_shift; 2493b1a94c8SDamien Le Moal } 2503b1a94c8SDamien Le Moal 2513b1a94c8SDamien Le Moal sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) 2523b1a94c8SDamien Le Moal { 253bd5c4031SHannes Reinecke unsigned int zone_id = dmz_dev_zone_id(zmd, zone); 254bd5c4031SHannes Reinecke 255bd5c4031SHannes Reinecke return (sector_t)zone_id << zmd->zone_nr_blocks_shift; 2563b1a94c8SDamien Le Moal } 2573b1a94c8SDamien Le Moal 258bf28a3baSHannes Reinecke struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone) 259bf28a3baSHannes Reinecke { 260bd5c4031SHannes Reinecke if (WARN_ON(!zone)) 261bd5c4031SHannes Reinecke return &zmd->dev[0]; 262bd5c4031SHannes Reinecke 263bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && 264bd5c4031SHannes Reinecke zone->id >= zmd->dev[1].zone_offset) 265bd5c4031SHannes Reinecke return &zmd->dev[1]; 266bd5c4031SHannes Reinecke 267bf28a3baSHannes Reinecke return &zmd->dev[0]; 268bf28a3baSHannes Reinecke } 269bf28a3baSHannes Reinecke 27036820560SHannes Reinecke unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd) 27136820560SHannes Reinecke { 27236820560SHannes Reinecke return zmd->zone_nr_blocks; 27336820560SHannes Reinecke } 27436820560SHannes Reinecke 27536820560SHannes Reinecke unsigned int dmz_zone_nr_blocks_shift(struct dmz_metadata *zmd) 27636820560SHannes Reinecke { 27736820560SHannes Reinecke return zmd->zone_nr_blocks_shift; 27836820560SHannes Reinecke } 27936820560SHannes Reinecke 28036820560SHannes Reinecke unsigned int dmz_zone_nr_sectors(struct dmz_metadata *zmd) 28136820560SHannes Reinecke { 28236820560SHannes Reinecke return zmd->zone_nr_sectors; 28336820560SHannes Reinecke } 28436820560SHannes Reinecke 28536820560SHannes Reinecke unsigned int dmz_zone_nr_sectors_shift(struct dmz_metadata *zmd) 28636820560SHannes Reinecke { 28736820560SHannes Reinecke return zmd->zone_nr_sectors_shift; 28836820560SHannes Reinecke } 28936820560SHannes Reinecke 290bc3d5717SHannes Reinecke unsigned int dmz_nr_zones(struct dmz_metadata *zmd) 291bc3d5717SHannes Reinecke { 29236820560SHannes Reinecke return zmd->nr_zones; 293bc3d5717SHannes Reinecke } 294bc3d5717SHannes Reinecke 2953b1a94c8SDamien Le Moal unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) 2963b1a94c8SDamien Le Moal { 2973b1a94c8SDamien Le Moal return zmd->nr_chunks; 2983b1a94c8SDamien Le Moal } 2993b1a94c8SDamien Le Moal 3003b1a94c8SDamien Le Moal unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) 3013b1a94c8SDamien Le Moal { 3023b1a94c8SDamien Le Moal return zmd->nr_rnd; 3033b1a94c8SDamien Le Moal } 3043b1a94c8SDamien Le Moal 3053b1a94c8SDamien Le Moal unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) 3063b1a94c8SDamien Le Moal { 3073b1a94c8SDamien Le Moal return atomic_read(&zmd->unmap_nr_rnd); 3083b1a94c8SDamien Le Moal } 3093b1a94c8SDamien Le Moal 31034f5affdSHannes Reinecke unsigned int dmz_nr_cache_zones(struct dmz_metadata *zmd) 31134f5affdSHannes Reinecke { 31234f5affdSHannes Reinecke return zmd->nr_cache; 31334f5affdSHannes Reinecke } 31434f5affdSHannes Reinecke 31534f5affdSHannes Reinecke unsigned int dmz_nr_unmap_cache_zones(struct dmz_metadata *zmd) 31634f5affdSHannes Reinecke { 31734f5affdSHannes Reinecke return atomic_read(&zmd->unmap_nr_cache); 31834f5affdSHannes Reinecke } 31934f5affdSHannes Reinecke 320bc3d5717SHannes Reinecke unsigned int dmz_nr_seq_zones(struct dmz_metadata *zmd) 321bc3d5717SHannes Reinecke { 322bc3d5717SHannes Reinecke return zmd->nr_seq; 323bc3d5717SHannes Reinecke } 324bc3d5717SHannes Reinecke 325bc3d5717SHannes Reinecke unsigned int dmz_nr_unmap_seq_zones(struct dmz_metadata *zmd) 326bc3d5717SHannes Reinecke { 327bc3d5717SHannes Reinecke return atomic_read(&zmd->unmap_nr_seq); 328bc3d5717SHannes Reinecke } 329bc3d5717SHannes Reinecke 330a92fbc44SHannes Reinecke static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) 331a92fbc44SHannes Reinecke { 332a92fbc44SHannes Reinecke return xa_load(&zmd->zones, zone_id); 333a92fbc44SHannes Reinecke } 334a92fbc44SHannes Reinecke 335a92fbc44SHannes Reinecke static struct dm_zone *dmz_insert(struct dmz_metadata *zmd, 336a92fbc44SHannes Reinecke unsigned int zone_id) 337a92fbc44SHannes Reinecke { 338a92fbc44SHannes Reinecke struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL); 339a92fbc44SHannes Reinecke 340a92fbc44SHannes Reinecke if (!zone) 341a92fbc44SHannes Reinecke return ERR_PTR(-ENOMEM); 342a92fbc44SHannes Reinecke 343a92fbc44SHannes Reinecke if (xa_insert(&zmd->zones, zone_id, zone, GFP_KERNEL)) { 344a92fbc44SHannes Reinecke kfree(zone); 345a92fbc44SHannes Reinecke return ERR_PTR(-EBUSY); 346a92fbc44SHannes Reinecke } 347a92fbc44SHannes Reinecke 348a92fbc44SHannes Reinecke INIT_LIST_HEAD(&zone->link); 349a92fbc44SHannes Reinecke atomic_set(&zone->refcount, 0); 350a92fbc44SHannes Reinecke zone->id = zone_id; 351a92fbc44SHannes Reinecke zone->chunk = DMZ_MAP_UNMAPPED; 352a92fbc44SHannes Reinecke 353a92fbc44SHannes Reinecke return zone; 354a92fbc44SHannes Reinecke } 355a92fbc44SHannes Reinecke 3562234e732SHannes Reinecke const char *dmz_metadata_label(struct dmz_metadata *zmd) 3572234e732SHannes Reinecke { 358bd5c4031SHannes Reinecke return (const char *)zmd->label; 3592234e732SHannes Reinecke } 3602234e732SHannes Reinecke 361d0e21ce4SHannes Reinecke bool dmz_check_dev(struct dmz_metadata *zmd) 362d0e21ce4SHannes Reinecke { 363bd5c4031SHannes Reinecke unsigned int i; 364bd5c4031SHannes Reinecke 365bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) { 366bd5c4031SHannes Reinecke if (!dmz_check_bdev(&zmd->dev[i])) 367bd5c4031SHannes Reinecke return false; 368bd5c4031SHannes Reinecke } 369bd5c4031SHannes Reinecke return true; 370d0e21ce4SHannes Reinecke } 371d0e21ce4SHannes Reinecke 372d0e21ce4SHannes Reinecke bool dmz_dev_is_dying(struct dmz_metadata *zmd) 373d0e21ce4SHannes Reinecke { 374bd5c4031SHannes Reinecke unsigned int i; 375bd5c4031SHannes Reinecke 376bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) { 377bd5c4031SHannes Reinecke if (dmz_bdev_is_dying(&zmd->dev[i])) 378bd5c4031SHannes Reinecke return true; 379bd5c4031SHannes Reinecke } 380bd5c4031SHannes Reinecke return false; 381d0e21ce4SHannes Reinecke } 382d0e21ce4SHannes Reinecke 3833b1a94c8SDamien Le Moal /* 3843b1a94c8SDamien Le Moal * Lock/unlock mapping table. 3853b1a94c8SDamien Le Moal * The map lock also protects all the zone lists. 3863b1a94c8SDamien Le Moal */ 3873b1a94c8SDamien Le Moal void dmz_lock_map(struct dmz_metadata *zmd) 3883b1a94c8SDamien Le Moal { 3893b1a94c8SDamien Le Moal mutex_lock(&zmd->map_lock); 3903b1a94c8SDamien Le Moal } 3913b1a94c8SDamien Le Moal 3923b1a94c8SDamien Le Moal void dmz_unlock_map(struct dmz_metadata *zmd) 3933b1a94c8SDamien Le Moal { 3943b1a94c8SDamien Le Moal mutex_unlock(&zmd->map_lock); 3953b1a94c8SDamien Le Moal } 3963b1a94c8SDamien Le Moal 3973b1a94c8SDamien Le Moal /* 3983b1a94c8SDamien Le Moal * Lock/unlock metadata access. This is a "read" lock on a semaphore 3993b1a94c8SDamien Le Moal * that prevents metadata flush from running while metadata are being 4003b1a94c8SDamien Le Moal * modified. The actual metadata write mutual exclusion is achieved with 401ad1bd578SDmitry Fomichev * the map lock and zone state management (active and reclaim state are 4023b1a94c8SDamien Le Moal * mutually exclusive). 4033b1a94c8SDamien Le Moal */ 4043b1a94c8SDamien Le Moal void dmz_lock_metadata(struct dmz_metadata *zmd) 4053b1a94c8SDamien Le Moal { 4063b1a94c8SDamien Le Moal down_read(&zmd->mblk_sem); 4073b1a94c8SDamien Le Moal } 4083b1a94c8SDamien Le Moal 4093b1a94c8SDamien Le Moal void dmz_unlock_metadata(struct dmz_metadata *zmd) 4103b1a94c8SDamien Le Moal { 4113b1a94c8SDamien Le Moal up_read(&zmd->mblk_sem); 4123b1a94c8SDamien Le Moal } 4133b1a94c8SDamien Le Moal 4143b1a94c8SDamien Le Moal /* 4153b1a94c8SDamien Le Moal * Lock/unlock flush: prevent concurrent executions 4163b1a94c8SDamien Le Moal * of dmz_flush_metadata as well as metadata modification in reclaim 4173b1a94c8SDamien Le Moal * while flush is being executed. 4183b1a94c8SDamien Le Moal */ 4193b1a94c8SDamien Le Moal void dmz_lock_flush(struct dmz_metadata *zmd) 4203b1a94c8SDamien Le Moal { 4213b1a94c8SDamien Le Moal mutex_lock(&zmd->mblk_flush_lock); 4223b1a94c8SDamien Le Moal } 4233b1a94c8SDamien Le Moal 4243b1a94c8SDamien Le Moal void dmz_unlock_flush(struct dmz_metadata *zmd) 4253b1a94c8SDamien Le Moal { 4263b1a94c8SDamien Le Moal mutex_unlock(&zmd->mblk_flush_lock); 4273b1a94c8SDamien Le Moal } 4283b1a94c8SDamien Le Moal 4293b1a94c8SDamien Le Moal /* 4303b1a94c8SDamien Le Moal * Allocate a metadata block. 4313b1a94c8SDamien Le Moal */ 4323b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, 4333b1a94c8SDamien Le Moal sector_t mblk_no) 4343b1a94c8SDamien Le Moal { 4353b1a94c8SDamien Le Moal struct dmz_mblock *mblk = NULL; 4363b1a94c8SDamien Le Moal 4373b1a94c8SDamien Le Moal /* See if we can reuse cached blocks */ 4383b1a94c8SDamien Le Moal if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { 4393b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 4403b1a94c8SDamien Le Moal mblk = list_first_entry_or_null(&zmd->mblk_lru_list, 4413b1a94c8SDamien Le Moal struct dmz_mblock, link); 4423b1a94c8SDamien Le Moal if (mblk) { 4433b1a94c8SDamien Le Moal list_del_init(&mblk->link); 4443b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 4453b1a94c8SDamien Le Moal mblk->no = mblk_no; 4463b1a94c8SDamien Le Moal } 4473b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 4483b1a94c8SDamien Le Moal if (mblk) 4493b1a94c8SDamien Le Moal return mblk; 4503b1a94c8SDamien Le Moal } 4513b1a94c8SDamien Le Moal 4523b1a94c8SDamien Le Moal /* Allocate a new block */ 4533b1a94c8SDamien Le Moal mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); 4543b1a94c8SDamien Le Moal if (!mblk) 4553b1a94c8SDamien Le Moal return NULL; 4563b1a94c8SDamien Le Moal 4573b1a94c8SDamien Le Moal mblk->page = alloc_page(GFP_NOIO); 4583b1a94c8SDamien Le Moal if (!mblk->page) { 4593b1a94c8SDamien Le Moal kfree(mblk); 4603b1a94c8SDamien Le Moal return NULL; 4613b1a94c8SDamien Le Moal } 4623b1a94c8SDamien Le Moal 4633b1a94c8SDamien Le Moal RB_CLEAR_NODE(&mblk->node); 4643b1a94c8SDamien Le Moal INIT_LIST_HEAD(&mblk->link); 46533c2865fSDamien Le Moal mblk->ref = 0; 4663b1a94c8SDamien Le Moal mblk->state = 0; 4673b1a94c8SDamien Le Moal mblk->no = mblk_no; 4683b1a94c8SDamien Le Moal mblk->data = page_address(mblk->page); 4693b1a94c8SDamien Le Moal 4703b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_mblks); 4713b1a94c8SDamien Le Moal 4723b1a94c8SDamien Le Moal return mblk; 4733b1a94c8SDamien Le Moal } 4743b1a94c8SDamien Le Moal 4753b1a94c8SDamien Le Moal /* 4763b1a94c8SDamien Le Moal * Free a metadata block. 4773b1a94c8SDamien Le Moal */ 4783b1a94c8SDamien Le Moal static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 4793b1a94c8SDamien Le Moal { 4803b1a94c8SDamien Le Moal __free_pages(mblk->page, 0); 4813b1a94c8SDamien Le Moal kfree(mblk); 4823b1a94c8SDamien Le Moal 4833b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_mblks); 4843b1a94c8SDamien Le Moal } 4853b1a94c8SDamien Le Moal 4863b1a94c8SDamien Le Moal /* 4873b1a94c8SDamien Le Moal * Insert a metadata block in the rbtree. 4883b1a94c8SDamien Le Moal */ 4893b1a94c8SDamien Le Moal static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 4903b1a94c8SDamien Le Moal { 4913b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 4923b1a94c8SDamien Le Moal struct rb_node **new = &(root->rb_node), *parent = NULL; 4933b1a94c8SDamien Le Moal struct dmz_mblock *b; 4943b1a94c8SDamien Le Moal 4953b1a94c8SDamien Le Moal /* Figure out where to put the new node */ 4963b1a94c8SDamien Le Moal while (*new) { 4973b1a94c8SDamien Le Moal b = container_of(*new, struct dmz_mblock, node); 4983b1a94c8SDamien Le Moal parent = *new; 4993b1a94c8SDamien Le Moal new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); 5003b1a94c8SDamien Le Moal } 5013b1a94c8SDamien Le Moal 5023b1a94c8SDamien Le Moal /* Add new node and rebalance tree */ 5033b1a94c8SDamien Le Moal rb_link_node(&mblk->node, parent, new); 5043b1a94c8SDamien Le Moal rb_insert_color(&mblk->node, root); 5053b1a94c8SDamien Le Moal } 5063b1a94c8SDamien Le Moal 5073b1a94c8SDamien Le Moal /* 5083d4e7383SDamien Le Moal * Lookup a metadata block in the rbtree. If the block is found, increment 5093d4e7383SDamien Le Moal * its reference count. 5103b1a94c8SDamien Le Moal */ 5113d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, 5123b1a94c8SDamien Le Moal sector_t mblk_no) 5133b1a94c8SDamien Le Moal { 5143b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 5153b1a94c8SDamien Le Moal struct rb_node *node = root->rb_node; 5163b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 5173b1a94c8SDamien Le Moal 5183b1a94c8SDamien Le Moal while (node) { 5193b1a94c8SDamien Le Moal mblk = container_of(node, struct dmz_mblock, node); 5203d4e7383SDamien Le Moal if (mblk->no == mblk_no) { 5213d4e7383SDamien Le Moal /* 5223d4e7383SDamien Le Moal * If this is the first reference to the block, 5233d4e7383SDamien Le Moal * remove it from the LRU list. 5243d4e7383SDamien Le Moal */ 5253d4e7383SDamien Le Moal mblk->ref++; 5263d4e7383SDamien Le Moal if (mblk->ref == 1 && 5273d4e7383SDamien Le Moal !test_bit(DMZ_META_DIRTY, &mblk->state)) 5283d4e7383SDamien Le Moal list_del_init(&mblk->link); 5293b1a94c8SDamien Le Moal return mblk; 5303d4e7383SDamien Le Moal } 5313b1a94c8SDamien Le Moal node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; 5323b1a94c8SDamien Le Moal } 5333b1a94c8SDamien Le Moal 5343b1a94c8SDamien Le Moal return NULL; 5353b1a94c8SDamien Le Moal } 5363b1a94c8SDamien Le Moal 5373b1a94c8SDamien Le Moal /* 5383b1a94c8SDamien Le Moal * Metadata block BIO end callback. 5393b1a94c8SDamien Le Moal */ 5403b1a94c8SDamien Le Moal static void dmz_mblock_bio_end_io(struct bio *bio) 5413b1a94c8SDamien Le Moal { 5423b1a94c8SDamien Le Moal struct dmz_mblock *mblk = bio->bi_private; 5433b1a94c8SDamien Le Moal int flag; 5443b1a94c8SDamien Le Moal 5453b1a94c8SDamien Le Moal if (bio->bi_status) 5463b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 5473b1a94c8SDamien Le Moal 5483b1a94c8SDamien Le Moal if (bio_op(bio) == REQ_OP_WRITE) 5493b1a94c8SDamien Le Moal flag = DMZ_META_WRITING; 5503b1a94c8SDamien Le Moal else 5513b1a94c8SDamien Le Moal flag = DMZ_META_READING; 5523b1a94c8SDamien Le Moal 5533b1a94c8SDamien Le Moal clear_bit_unlock(flag, &mblk->state); 5543b1a94c8SDamien Le Moal smp_mb__after_atomic(); 5553b1a94c8SDamien Le Moal wake_up_bit(&mblk->state, flag); 5563b1a94c8SDamien Le Moal 5573b1a94c8SDamien Le Moal bio_put(bio); 5583b1a94c8SDamien Le Moal } 5593b1a94c8SDamien Le Moal 5603b1a94c8SDamien Le Moal /* 5613d4e7383SDamien Le Moal * Read an uncached metadata block from disk and add it to the cache. 5623b1a94c8SDamien Le Moal */ 5633d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, 5643b1a94c8SDamien Le Moal sector_t mblk_no) 5653b1a94c8SDamien Le Moal { 5663d4e7383SDamien Le Moal struct dmz_mblock *mblk, *m; 5673b1a94c8SDamien Le Moal sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; 568bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; 5693b1a94c8SDamien Le Moal struct bio *bio; 5703b1a94c8SDamien Le Moal 571bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 57275d66ffbSDmitry Fomichev return ERR_PTR(-EIO); 57375d66ffbSDmitry Fomichev 5743d4e7383SDamien Le Moal /* Get a new block and a BIO to read it */ 5753b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, mblk_no); 5763b1a94c8SDamien Le Moal if (!mblk) 57775d66ffbSDmitry Fomichev return ERR_PTR(-ENOMEM); 5783b1a94c8SDamien Le Moal 5793b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 5803b1a94c8SDamien Le Moal if (!bio) { 5813b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 58275d66ffbSDmitry Fomichev return ERR_PTR(-ENOMEM); 5833b1a94c8SDamien Le Moal } 5843b1a94c8SDamien Le Moal 5853d4e7383SDamien Le Moal spin_lock(&zmd->mblk_lock); 5863d4e7383SDamien Le Moal 5873d4e7383SDamien Le Moal /* 5883d4e7383SDamien Le Moal * Make sure that another context did not start reading 5893d4e7383SDamien Le Moal * the block already. 5903d4e7383SDamien Le Moal */ 5913d4e7383SDamien Le Moal m = dmz_get_mblock_fast(zmd, mblk_no); 5923d4e7383SDamien Le Moal if (m) { 5933d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5943d4e7383SDamien Le Moal dmz_free_mblock(zmd, mblk); 5953d4e7383SDamien Le Moal bio_put(bio); 5963d4e7383SDamien Le Moal return m; 5973d4e7383SDamien Le Moal } 5983d4e7383SDamien Le Moal 5993d4e7383SDamien Le Moal mblk->ref++; 6003d4e7383SDamien Le Moal set_bit(DMZ_META_READING, &mblk->state); 6013d4e7383SDamien Le Moal dmz_insert_mblock(zmd, mblk); 6023d4e7383SDamien Le Moal 6033d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6043d4e7383SDamien Le Moal 6053d4e7383SDamien Le Moal /* Submit read BIO */ 6063b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 607bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 6083b1a94c8SDamien Le Moal bio->bi_private = mblk; 6093b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 6103b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); 6113b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 6123b1a94c8SDamien Le Moal submit_bio(bio); 6133b1a94c8SDamien Le Moal 6143b1a94c8SDamien Le Moal return mblk; 6153b1a94c8SDamien Le Moal } 6163b1a94c8SDamien Le Moal 6173b1a94c8SDamien Le Moal /* 6183b1a94c8SDamien Le Moal * Free metadata blocks. 6193b1a94c8SDamien Le Moal */ 6203b1a94c8SDamien Le Moal static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, 6213b1a94c8SDamien Le Moal unsigned long limit) 6223b1a94c8SDamien Le Moal { 6233b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 6243b1a94c8SDamien Le Moal unsigned long count = 0; 6253b1a94c8SDamien Le Moal 6263b1a94c8SDamien Le Moal if (!zmd->max_nr_mblks) 6273b1a94c8SDamien Le Moal return 0; 6283b1a94c8SDamien Le Moal 6293b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list) && 6303b1a94c8SDamien Le Moal atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && 6313b1a94c8SDamien Le Moal count < limit) { 6323b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 6333b1a94c8SDamien Le Moal struct dmz_mblock, link); 6343b1a94c8SDamien Le Moal list_del_init(&mblk->link); 6353b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 6363b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 6373b1a94c8SDamien Le Moal count++; 6383b1a94c8SDamien Le Moal } 6393b1a94c8SDamien Le Moal 6403b1a94c8SDamien Le Moal return count; 6413b1a94c8SDamien Le Moal } 6423b1a94c8SDamien Le Moal 6433b1a94c8SDamien Le Moal /* 6443b1a94c8SDamien Le Moal * For mblock shrinker: get the number of unused metadata blocks in the cache. 6453b1a94c8SDamien Le Moal */ 6463b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, 6473b1a94c8SDamien Le Moal struct shrink_control *sc) 6483b1a94c8SDamien Le Moal { 6493b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 6503b1a94c8SDamien Le Moal 6513b1a94c8SDamien Le Moal return atomic_read(&zmd->nr_mblks); 6523b1a94c8SDamien Le Moal } 6533b1a94c8SDamien Le Moal 6543b1a94c8SDamien Le Moal /* 6553b1a94c8SDamien Le Moal * For mblock shrinker: scan unused metadata blocks and shrink the cache. 6563b1a94c8SDamien Le Moal */ 6573b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, 6583b1a94c8SDamien Le Moal struct shrink_control *sc) 6593b1a94c8SDamien Le Moal { 6603b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 6613b1a94c8SDamien Le Moal unsigned long count; 6623b1a94c8SDamien Le Moal 6633b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6643b1a94c8SDamien Le Moal count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); 6653b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6663b1a94c8SDamien Le Moal 6673b1a94c8SDamien Le Moal return count ? count : SHRINK_STOP; 6683b1a94c8SDamien Le Moal } 6693b1a94c8SDamien Le Moal 6703b1a94c8SDamien Le Moal /* 6713b1a94c8SDamien Le Moal * Release a metadata block. 6723b1a94c8SDamien Le Moal */ 6733b1a94c8SDamien Le Moal static void dmz_release_mblock(struct dmz_metadata *zmd, 6743b1a94c8SDamien Le Moal struct dmz_mblock *mblk) 6753b1a94c8SDamien Le Moal { 6763b1a94c8SDamien Le Moal 6773b1a94c8SDamien Le Moal if (!mblk) 6783b1a94c8SDamien Le Moal return; 6793b1a94c8SDamien Le Moal 6803b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 6813b1a94c8SDamien Le Moal 68233c2865fSDamien Le Moal mblk->ref--; 68333c2865fSDamien Le Moal if (mblk->ref == 0) { 6843b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 6853b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 6863b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 6873b1a94c8SDamien Le Moal } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { 6883b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 6893b1a94c8SDamien Le Moal dmz_shrink_mblock_cache(zmd, 1); 6903b1a94c8SDamien Le Moal } 6913b1a94c8SDamien Le Moal } 6923b1a94c8SDamien Le Moal 6933b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 6943b1a94c8SDamien Le Moal } 6953b1a94c8SDamien Le Moal 6963b1a94c8SDamien Le Moal /* 6973b1a94c8SDamien Le Moal * Get a metadata block from the rbtree. If the block 6983b1a94c8SDamien Le Moal * is not present, read it from disk. 6993b1a94c8SDamien Le Moal */ 7003b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, 7013b1a94c8SDamien Le Moal sector_t mblk_no) 7023b1a94c8SDamien Le Moal { 7033b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 704bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[zmd->mblk_primary].dev; 7053b1a94c8SDamien Le Moal 7063b1a94c8SDamien Le Moal /* Check rbtree */ 7073b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 7083d4e7383SDamien Le Moal mblk = dmz_get_mblock_fast(zmd, mblk_no); 7093b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 7103b1a94c8SDamien Le Moal 7113b1a94c8SDamien Le Moal if (!mblk) { 7123b1a94c8SDamien Le Moal /* Cache miss: read the block from disk */ 7133d4e7383SDamien Le Moal mblk = dmz_get_mblock_slow(zmd, mblk_no); 71475d66ffbSDmitry Fomichev if (IS_ERR(mblk)) 71575d66ffbSDmitry Fomichev return mblk; 7163b1a94c8SDamien Le Moal } 7173b1a94c8SDamien Le Moal 7183b1a94c8SDamien Le Moal /* Wait for on-going read I/O and check for error */ 7193b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_READING, 7203b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 7213b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 7223b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 723bf28a3baSHannes Reinecke dmz_check_bdev(dev); 7243b1a94c8SDamien Le Moal return ERR_PTR(-EIO); 7253b1a94c8SDamien Le Moal } 7263b1a94c8SDamien Le Moal 7273b1a94c8SDamien Le Moal return mblk; 7283b1a94c8SDamien Le Moal } 7293b1a94c8SDamien Le Moal 7303b1a94c8SDamien Le Moal /* 7313b1a94c8SDamien Le Moal * Mark a metadata block dirty. 7323b1a94c8SDamien Le Moal */ 7333b1a94c8SDamien Le Moal static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 7343b1a94c8SDamien Le Moal { 7353b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 7363b1a94c8SDamien Le Moal if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) 7373b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_dirty_list); 7383b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 7393b1a94c8SDamien Le Moal } 7403b1a94c8SDamien Le Moal 7413b1a94c8SDamien Le Moal /* 7423b1a94c8SDamien Le Moal * Issue a metadata block write BIO. 7433b1a94c8SDamien Le Moal */ 74475d66ffbSDmitry Fomichev static int dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, 7453b1a94c8SDamien Le Moal unsigned int set) 7463b1a94c8SDamien Le Moal { 747bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 7483b1a94c8SDamien Le Moal sector_t block = zmd->sb[set].block + mblk->no; 7493b1a94c8SDamien Le Moal struct bio *bio; 7503b1a94c8SDamien Le Moal 751bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 75275d66ffbSDmitry Fomichev return -EIO; 75375d66ffbSDmitry Fomichev 7543b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 7553b1a94c8SDamien Le Moal if (!bio) { 7563b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 75775d66ffbSDmitry Fomichev return -ENOMEM; 7583b1a94c8SDamien Le Moal } 7593b1a94c8SDamien Le Moal 7603b1a94c8SDamien Le Moal set_bit(DMZ_META_WRITING, &mblk->state); 7613b1a94c8SDamien Le Moal 7623b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 763bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 7643b1a94c8SDamien Le Moal bio->bi_private = mblk; 7653b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 7663b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); 7673b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 7683b1a94c8SDamien Le Moal submit_bio(bio); 76975d66ffbSDmitry Fomichev 77075d66ffbSDmitry Fomichev return 0; 7713b1a94c8SDamien Le Moal } 7723b1a94c8SDamien Le Moal 7733b1a94c8SDamien Le Moal /* 7743b1a94c8SDamien Le Moal * Read/write a metadata block. 7753b1a94c8SDamien Le Moal */ 776bf28a3baSHannes Reinecke static int dmz_rdwr_block(struct dmz_dev *dev, int op, 777bf28a3baSHannes Reinecke sector_t block, struct page *page) 7783b1a94c8SDamien Le Moal { 7793b1a94c8SDamien Le Moal struct bio *bio; 7803b1a94c8SDamien Le Moal int ret; 7813b1a94c8SDamien Le Moal 782bd5c4031SHannes Reinecke if (WARN_ON(!dev)) 783bd5c4031SHannes Reinecke return -EIO; 784bd5c4031SHannes Reinecke 785bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) 78675d66ffbSDmitry Fomichev return -EIO; 78775d66ffbSDmitry Fomichev 7883b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 7893b1a94c8SDamien Le Moal if (!bio) 7903b1a94c8SDamien Le Moal return -ENOMEM; 7913b1a94c8SDamien Le Moal 7923b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 793bf28a3baSHannes Reinecke bio_set_dev(bio, dev->bdev); 7943b1a94c8SDamien Le Moal bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); 7953b1a94c8SDamien Le Moal bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); 7963b1a94c8SDamien Le Moal ret = submit_bio_wait(bio); 7973b1a94c8SDamien Le Moal bio_put(bio); 7983b1a94c8SDamien Le Moal 799e7fad909SDmitry Fomichev if (ret) 800bf28a3baSHannes Reinecke dmz_check_bdev(dev); 8013b1a94c8SDamien Le Moal return ret; 8023b1a94c8SDamien Le Moal } 8033b1a94c8SDamien Le Moal 8043b1a94c8SDamien Le Moal /* 8053b1a94c8SDamien Le Moal * Write super block of the specified metadata set. 8063b1a94c8SDamien Le Moal */ 8073b1a94c8SDamien Le Moal static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) 8083b1a94c8SDamien Le Moal { 8093b1a94c8SDamien Le Moal struct dmz_mblock *mblk = zmd->sb[set].mblk; 8103b1a94c8SDamien Le Moal struct dmz_super *sb = zmd->sb[set].sb; 811bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 812bd5c4031SHannes Reinecke sector_t sb_block; 8133b1a94c8SDamien Le Moal u64 sb_gen = zmd->sb_gen + 1; 8143b1a94c8SDamien Le Moal int ret; 8153b1a94c8SDamien Le Moal 8163b1a94c8SDamien Le Moal sb->magic = cpu_to_le32(DMZ_MAGIC); 817bd5c4031SHannes Reinecke 818bd5c4031SHannes Reinecke sb->version = cpu_to_le32(zmd->sb_version); 819bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 820bd5c4031SHannes Reinecke BUILD_BUG_ON(UUID_SIZE != 16); 821bd5c4031SHannes Reinecke export_uuid(sb->dmz_uuid, &zmd->uuid); 822bd5c4031SHannes Reinecke memcpy(sb->dmz_label, zmd->label, BDEVNAME_SIZE); 823bd5c4031SHannes Reinecke export_uuid(sb->dev_uuid, &dev->uuid); 824bd5c4031SHannes Reinecke } 8253b1a94c8SDamien Le Moal 8263b1a94c8SDamien Le Moal sb->gen = cpu_to_le64(sb_gen); 8273b1a94c8SDamien Le Moal 828bd5c4031SHannes Reinecke /* 829bd5c4031SHannes Reinecke * The metadata always references the absolute block address, 830bd5c4031SHannes Reinecke * ie relative to the entire block range, not the per-device 831bd5c4031SHannes Reinecke * block address. 832bd5c4031SHannes Reinecke */ 833bd5c4031SHannes Reinecke sb_block = zmd->sb[set].zone->id << zmd->zone_nr_blocks_shift; 834bd5c4031SHannes Reinecke sb->sb_block = cpu_to_le64(sb_block); 8353b1a94c8SDamien Le Moal sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); 8363b1a94c8SDamien Le Moal sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); 8373b1a94c8SDamien Le Moal sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); 8383b1a94c8SDamien Le Moal 8393b1a94c8SDamien Le Moal sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); 8403b1a94c8SDamien Le Moal sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); 8413b1a94c8SDamien Le Moal 8423b1a94c8SDamien Le Moal sb->crc = 0; 8433b1a94c8SDamien Le Moal sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); 8443b1a94c8SDamien Le Moal 845bd5c4031SHannes Reinecke ret = dmz_rdwr_block(dev, REQ_OP_WRITE, zmd->sb[set].block, 846bd5c4031SHannes Reinecke mblk->page); 8473b1a94c8SDamien Le Moal if (ret == 0) 848bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 8493b1a94c8SDamien Le Moal 8503b1a94c8SDamien Le Moal return ret; 8513b1a94c8SDamien Le Moal } 8523b1a94c8SDamien Le Moal 8533b1a94c8SDamien Le Moal /* 8543b1a94c8SDamien Le Moal * Write dirty metadata blocks to the specified set. 8553b1a94c8SDamien Le Moal */ 8563b1a94c8SDamien Le Moal static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, 8573b1a94c8SDamien Le Moal struct list_head *write_list, 8583b1a94c8SDamien Le Moal unsigned int set) 8593b1a94c8SDamien Le Moal { 8603b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 861bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 8623b1a94c8SDamien Le Moal struct blk_plug plug; 86375d66ffbSDmitry Fomichev int ret = 0, nr_mblks_submitted = 0; 8643b1a94c8SDamien Le Moal 8653b1a94c8SDamien Le Moal /* Issue writes */ 8663b1a94c8SDamien Le Moal blk_start_plug(&plug); 86775d66ffbSDmitry Fomichev list_for_each_entry(mblk, write_list, link) { 86875d66ffbSDmitry Fomichev ret = dmz_write_mblock(zmd, mblk, set); 86975d66ffbSDmitry Fomichev if (ret) 87075d66ffbSDmitry Fomichev break; 87175d66ffbSDmitry Fomichev nr_mblks_submitted++; 87275d66ffbSDmitry Fomichev } 8733b1a94c8SDamien Le Moal blk_finish_plug(&plug); 8743b1a94c8SDamien Le Moal 8753b1a94c8SDamien Le Moal /* Wait for completion */ 8763b1a94c8SDamien Le Moal list_for_each_entry(mblk, write_list, link) { 87775d66ffbSDmitry Fomichev if (!nr_mblks_submitted) 87875d66ffbSDmitry Fomichev break; 8793b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_WRITING, 8803b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 8813b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 8823b1a94c8SDamien Le Moal clear_bit(DMZ_META_ERROR, &mblk->state); 883bf28a3baSHannes Reinecke dmz_check_bdev(dev); 8843b1a94c8SDamien Le Moal ret = -EIO; 8853b1a94c8SDamien Le Moal } 88675d66ffbSDmitry Fomichev nr_mblks_submitted--; 8873b1a94c8SDamien Le Moal } 8883b1a94c8SDamien Le Moal 8893b1a94c8SDamien Le Moal /* Flush drive cache (this will also sync data) */ 8903b1a94c8SDamien Le Moal if (ret == 0) 891bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 8923b1a94c8SDamien Le Moal 8933b1a94c8SDamien Le Moal return ret; 8943b1a94c8SDamien Le Moal } 8953b1a94c8SDamien Le Moal 8963b1a94c8SDamien Le Moal /* 8973b1a94c8SDamien Le Moal * Log dirty metadata blocks. 8983b1a94c8SDamien Le Moal */ 8993b1a94c8SDamien Le Moal static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, 9003b1a94c8SDamien Le Moal struct list_head *write_list) 9013b1a94c8SDamien Le Moal { 9023b1a94c8SDamien Le Moal unsigned int log_set = zmd->mblk_primary ^ 0x1; 9033b1a94c8SDamien Le Moal int ret; 9043b1a94c8SDamien Le Moal 9053b1a94c8SDamien Le Moal /* Write dirty blocks to the log */ 9063b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); 9073b1a94c8SDamien Le Moal if (ret) 9083b1a94c8SDamien Le Moal return ret; 9093b1a94c8SDamien Le Moal 9103b1a94c8SDamien Le Moal /* 9113b1a94c8SDamien Le Moal * No error so far: now validate the log by updating the 9123b1a94c8SDamien Le Moal * log index super block generation. 9133b1a94c8SDamien Le Moal */ 9143b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, log_set); 9153b1a94c8SDamien Le Moal if (ret) 9163b1a94c8SDamien Le Moal return ret; 9173b1a94c8SDamien Le Moal 9183b1a94c8SDamien Le Moal return 0; 9193b1a94c8SDamien Le Moal } 9203b1a94c8SDamien Le Moal 9213b1a94c8SDamien Le Moal /* 9223b1a94c8SDamien Le Moal * Flush dirty metadata blocks. 9233b1a94c8SDamien Le Moal */ 9243b1a94c8SDamien Le Moal int dmz_flush_metadata(struct dmz_metadata *zmd) 9253b1a94c8SDamien Le Moal { 9263b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 9273b1a94c8SDamien Le Moal struct list_head write_list; 928bf28a3baSHannes Reinecke struct dmz_dev *dev; 9293b1a94c8SDamien Le Moal int ret; 9303b1a94c8SDamien Le Moal 9313b1a94c8SDamien Le Moal if (WARN_ON(!zmd)) 9323b1a94c8SDamien Le Moal return 0; 9333b1a94c8SDamien Le Moal 9343b1a94c8SDamien Le Moal INIT_LIST_HEAD(&write_list); 9353b1a94c8SDamien Le Moal 9363b1a94c8SDamien Le Moal /* 9373b1a94c8SDamien Le Moal * Make sure that metadata blocks are stable before logging: take 9383b1a94c8SDamien Le Moal * the write lock on the metadata semaphore to prevent target BIOs 9393b1a94c8SDamien Le Moal * from modifying metadata. 9403b1a94c8SDamien Le Moal */ 9413b1a94c8SDamien Le Moal down_write(&zmd->mblk_sem); 942bf28a3baSHannes Reinecke dev = zmd->sb[zmd->mblk_primary].dev; 9433b1a94c8SDamien Le Moal 9443b1a94c8SDamien Le Moal /* 9453b1a94c8SDamien Le Moal * This is called from the target flush work and reclaim work. 9463b1a94c8SDamien Le Moal * Concurrent execution is not allowed. 9473b1a94c8SDamien Le Moal */ 9483b1a94c8SDamien Le Moal dmz_lock_flush(zmd); 9493b1a94c8SDamien Le Moal 950bf28a3baSHannes Reinecke if (dmz_bdev_is_dying(dev)) { 95175d66ffbSDmitry Fomichev ret = -EIO; 95275d66ffbSDmitry Fomichev goto out; 95375d66ffbSDmitry Fomichev } 95475d66ffbSDmitry Fomichev 9553b1a94c8SDamien Le Moal /* Get dirty blocks */ 9563b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 9573b1a94c8SDamien Le Moal list_splice_init(&zmd->mblk_dirty_list, &write_list); 9583b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 9593b1a94c8SDamien Le Moal 9603b1a94c8SDamien Le Moal /* If there are no dirty metadata blocks, just flush the device cache */ 9613b1a94c8SDamien Le Moal if (list_empty(&write_list)) { 962bf28a3baSHannes Reinecke ret = blkdev_issue_flush(dev->bdev, GFP_NOIO, NULL); 963e7fad909SDmitry Fomichev goto err; 9643b1a94c8SDamien Le Moal } 9653b1a94c8SDamien Le Moal 9663b1a94c8SDamien Le Moal /* 9673b1a94c8SDamien Le Moal * The primary metadata set is still clean. Keep it this way until 9683b1a94c8SDamien Le Moal * all updates are successful in the secondary set. That is, use 9693b1a94c8SDamien Le Moal * the secondary set as a log. 9703b1a94c8SDamien Le Moal */ 9713b1a94c8SDamien Le Moal ret = dmz_log_dirty_mblocks(zmd, &write_list); 9723b1a94c8SDamien Le Moal if (ret) 973e7fad909SDmitry Fomichev goto err; 9743b1a94c8SDamien Le Moal 9753b1a94c8SDamien Le Moal /* 9763b1a94c8SDamien Le Moal * The log is on disk. It is now safe to update in place 9773b1a94c8SDamien Le Moal * in the primary metadata set. 9783b1a94c8SDamien Le Moal */ 9793b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); 9803b1a94c8SDamien Le Moal if (ret) 981e7fad909SDmitry Fomichev goto err; 9823b1a94c8SDamien Le Moal 9833b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, zmd->mblk_primary); 9843b1a94c8SDamien Le Moal if (ret) 985e7fad909SDmitry Fomichev goto err; 9863b1a94c8SDamien Le Moal 9873b1a94c8SDamien Le Moal while (!list_empty(&write_list)) { 9883b1a94c8SDamien Le Moal mblk = list_first_entry(&write_list, struct dmz_mblock, link); 9893b1a94c8SDamien Le Moal list_del_init(&mblk->link); 9903b1a94c8SDamien Le Moal 9913b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 9923b1a94c8SDamien Le Moal clear_bit(DMZ_META_DIRTY, &mblk->state); 99333c2865fSDamien Le Moal if (mblk->ref == 0) 9943b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 9953b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 9963b1a94c8SDamien Le Moal } 9973b1a94c8SDamien Le Moal 9983b1a94c8SDamien Le Moal zmd->sb_gen++; 9993b1a94c8SDamien Le Moal out: 10003b1a94c8SDamien Le Moal dmz_unlock_flush(zmd); 10013b1a94c8SDamien Le Moal up_write(&zmd->mblk_sem); 10023b1a94c8SDamien Le Moal 10033b1a94c8SDamien Le Moal return ret; 1004e7fad909SDmitry Fomichev 1005e7fad909SDmitry Fomichev err: 1006e7fad909SDmitry Fomichev if (!list_empty(&write_list)) { 1007e7fad909SDmitry Fomichev spin_lock(&zmd->mblk_lock); 1008e7fad909SDmitry Fomichev list_splice(&write_list, &zmd->mblk_dirty_list); 1009e7fad909SDmitry Fomichev spin_unlock(&zmd->mblk_lock); 1010e7fad909SDmitry Fomichev } 1011bf28a3baSHannes Reinecke if (!dmz_check_bdev(dev)) 1012e7fad909SDmitry Fomichev ret = -EIO; 1013e7fad909SDmitry Fomichev goto out; 10143b1a94c8SDamien Le Moal } 10153b1a94c8SDamien Le Moal 10163b1a94c8SDamien Le Moal /* 10173b1a94c8SDamien Le Moal * Check super block. 10183b1a94c8SDamien Le Moal */ 1019735bd7e4SHannes Reinecke static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set) 10203b1a94c8SDamien Le Moal { 1021735bd7e4SHannes Reinecke struct dmz_super *sb = zmd->sb[set].sb; 1022bf28a3baSHannes Reinecke struct dmz_dev *dev = zmd->sb[set].dev; 10233b1a94c8SDamien Le Moal unsigned int nr_meta_zones, nr_data_zones; 10243b1a94c8SDamien Le Moal u32 crc, stored_crc; 10253b1a94c8SDamien Le Moal u64 gen; 10263b1a94c8SDamien Le Moal 1027bd5c4031SHannes Reinecke if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { 1028bd5c4031SHannes Reinecke dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", 1029bd5c4031SHannes Reinecke DMZ_MAGIC, le32_to_cpu(sb->magic)); 1030bd5c4031SHannes Reinecke return -ENXIO; 1031bd5c4031SHannes Reinecke } 1032bd5c4031SHannes Reinecke 1033bd5c4031SHannes Reinecke zmd->sb_version = le32_to_cpu(sb->version); 1034bd5c4031SHannes Reinecke if (zmd->sb_version > DMZ_META_VER) { 1035bd5c4031SHannes Reinecke dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", 1036bd5c4031SHannes Reinecke DMZ_META_VER, zmd->sb_version); 1037bd5c4031SHannes Reinecke return -EINVAL; 1038bd5c4031SHannes Reinecke } 1039bd5c4031SHannes Reinecke if ((zmd->sb_version < 1) && (set == 2)) { 1040bd5c4031SHannes Reinecke dmz_dev_err(dev, "Tertiary superblocks are not supported"); 1041bd5c4031SHannes Reinecke return -EINVAL; 1042bd5c4031SHannes Reinecke } 1043bd5c4031SHannes Reinecke 10443b1a94c8SDamien Le Moal gen = le64_to_cpu(sb->gen); 10453b1a94c8SDamien Le Moal stored_crc = le32_to_cpu(sb->crc); 10463b1a94c8SDamien Le Moal sb->crc = 0; 10473b1a94c8SDamien Le Moal crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); 10483b1a94c8SDamien Le Moal if (crc != stored_crc) { 10493b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", 10503b1a94c8SDamien Le Moal crc, stored_crc); 10513b1a94c8SDamien Le Moal return -ENXIO; 10523b1a94c8SDamien Le Moal } 10533b1a94c8SDamien Le Moal 1054bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 1055bd5c4031SHannes Reinecke uuid_t sb_uuid; 1056bd5c4031SHannes Reinecke 1057bd5c4031SHannes Reinecke import_uuid(&sb_uuid, sb->dmz_uuid); 1058bd5c4031SHannes Reinecke if (uuid_is_null(&sb_uuid)) { 1059bd5c4031SHannes Reinecke dmz_dev_err(dev, "NULL DM-Zoned uuid"); 1060bd5c4031SHannes Reinecke return -ENXIO; 1061bd5c4031SHannes Reinecke } else if (uuid_is_null(&zmd->uuid)) { 1062bd5c4031SHannes Reinecke uuid_copy(&zmd->uuid, &sb_uuid); 1063bd5c4031SHannes Reinecke } else if (!uuid_equal(&zmd->uuid, &sb_uuid)) { 1064bd5c4031SHannes Reinecke dmz_dev_err(dev, "mismatching DM-Zoned uuid, " 1065bd5c4031SHannes Reinecke "is %pUl expected %pUl", 1066bd5c4031SHannes Reinecke &sb_uuid, &zmd->uuid); 1067bd5c4031SHannes Reinecke return -ENXIO; 1068bd5c4031SHannes Reinecke } 1069bd5c4031SHannes Reinecke if (!strlen(zmd->label)) 1070bd5c4031SHannes Reinecke memcpy(zmd->label, sb->dmz_label, BDEVNAME_SIZE); 1071bd5c4031SHannes Reinecke else if (memcmp(zmd->label, sb->dmz_label, BDEVNAME_SIZE)) { 1072bd5c4031SHannes Reinecke dmz_dev_err(dev, "mismatching DM-Zoned label, " 1073bd5c4031SHannes Reinecke "is %s expected %s", 1074bd5c4031SHannes Reinecke sb->dmz_label, zmd->label); 1075bd5c4031SHannes Reinecke return -ENXIO; 1076bd5c4031SHannes Reinecke } 1077bd5c4031SHannes Reinecke import_uuid(&dev->uuid, sb->dev_uuid); 1078bd5c4031SHannes Reinecke if (uuid_is_null(&dev->uuid)) { 1079bd5c4031SHannes Reinecke dmz_dev_err(dev, "NULL device uuid"); 10803b1a94c8SDamien Le Moal return -ENXIO; 10813b1a94c8SDamien Le Moal } 10823b1a94c8SDamien Le Moal 1083bd5c4031SHannes Reinecke if (set == 2) { 1084bd5c4031SHannes Reinecke /* 1085bd5c4031SHannes Reinecke * Generation number should be 0, but it doesn't 1086bd5c4031SHannes Reinecke * really matter if it isn't. 1087bd5c4031SHannes Reinecke */ 1088bd5c4031SHannes Reinecke if (gen != 0) 1089bd5c4031SHannes Reinecke dmz_dev_warn(dev, "Invalid generation %llu", 1090bd5c4031SHannes Reinecke gen); 1091bd5c4031SHannes Reinecke return 0; 1092bd5c4031SHannes Reinecke } 10933b1a94c8SDamien Le Moal } 10943b1a94c8SDamien Le Moal 109536820560SHannes Reinecke nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1) 109636820560SHannes Reinecke >> zmd->zone_nr_blocks_shift; 10973b1a94c8SDamien Le Moal if (!nr_meta_zones || 10983b1a94c8SDamien Le Moal nr_meta_zones >= zmd->nr_rnd_zones) { 10993b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of metadata blocks"); 11003b1a94c8SDamien Le Moal return -ENXIO; 11013b1a94c8SDamien Le Moal } 11023b1a94c8SDamien Le Moal 11033b1a94c8SDamien Le Moal if (!le32_to_cpu(sb->nr_reserved_seq) || 11043b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { 11053b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of reserved sequential zones"); 11063b1a94c8SDamien Le Moal return -ENXIO; 11073b1a94c8SDamien Le Moal } 11083b1a94c8SDamien Le Moal 11093b1a94c8SDamien Le Moal nr_data_zones = zmd->nr_useable_zones - 11103b1a94c8SDamien Le Moal (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); 11113b1a94c8SDamien Le Moal if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { 11123b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of chunks %u / %u", 11133b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_chunks), nr_data_zones); 11143b1a94c8SDamien Le Moal return -ENXIO; 11153b1a94c8SDamien Le Moal } 11163b1a94c8SDamien Le Moal 11173b1a94c8SDamien Le Moal /* OK */ 11183b1a94c8SDamien Le Moal zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); 11193b1a94c8SDamien Le Moal zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); 11203b1a94c8SDamien Le Moal zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); 11213b1a94c8SDamien Le Moal zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); 11223b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); 11233b1a94c8SDamien Le Moal zmd->nr_meta_zones = nr_meta_zones; 11243b1a94c8SDamien Le Moal zmd->nr_data_zones = nr_data_zones; 11253b1a94c8SDamien Le Moal 11263b1a94c8SDamien Le Moal return 0; 11273b1a94c8SDamien Le Moal } 11283b1a94c8SDamien Le Moal 11293b1a94c8SDamien Le Moal /* 11303b1a94c8SDamien Le Moal * Read the first or second super block from disk. 11313b1a94c8SDamien Le Moal */ 11323b1a94c8SDamien Le Moal static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) 11333b1a94c8SDamien Le Moal { 113435d0c96eSHannes Reinecke dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu", 113535d0c96eSHannes Reinecke set, zmd->sb[set].dev->name, 113635d0c96eSHannes Reinecke zmd->sb[set].block); 113735d0c96eSHannes Reinecke 1138bf28a3baSHannes Reinecke return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ, 1139bf28a3baSHannes Reinecke zmd->sb[set].block, zmd->sb[set].mblk->page); 11403b1a94c8SDamien Le Moal } 11413b1a94c8SDamien Le Moal 11423b1a94c8SDamien Le Moal /* 11433b1a94c8SDamien Le Moal * Determine the position of the secondary super blocks on disk. 11443b1a94c8SDamien Le Moal * This is used only if a corruption of the primary super block 11453b1a94c8SDamien Le Moal * is detected. 11463b1a94c8SDamien Le Moal */ 11473b1a94c8SDamien Le Moal static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) 11483b1a94c8SDamien Le Moal { 114936820560SHannes Reinecke unsigned int zone_nr_blocks = zmd->zone_nr_blocks; 11503b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 1151a92fbc44SHannes Reinecke unsigned int zone_id = zmd->sb[0].zone->id; 11523b1a94c8SDamien Le Moal int i; 11533b1a94c8SDamien Le Moal 11543b1a94c8SDamien Le Moal /* Allocate a block */ 11553b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 11563b1a94c8SDamien Le Moal if (!mblk) 11573b1a94c8SDamien Le Moal return -ENOMEM; 11583b1a94c8SDamien Le Moal 11593b1a94c8SDamien Le Moal zmd->sb[1].mblk = mblk; 11603b1a94c8SDamien Le Moal zmd->sb[1].sb = mblk->data; 11613b1a94c8SDamien Le Moal 11623b1a94c8SDamien Le Moal /* Bad first super block: search for the second one */ 11633b1a94c8SDamien Le Moal zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; 1164a92fbc44SHannes Reinecke zmd->sb[1].zone = dmz_get(zmd, zone_id + 1); 11651565929bSHannes Reinecke zmd->sb[1].dev = zmd->sb[0].dev; 1166a92fbc44SHannes Reinecke for (i = 1; i < zmd->nr_rnd_zones; i++) { 11673b1a94c8SDamien Le Moal if (dmz_read_sb(zmd, 1) != 0) 11683b1a94c8SDamien Le Moal break; 1169a92fbc44SHannes Reinecke if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) 11703b1a94c8SDamien Le Moal return 0; 11713b1a94c8SDamien Le Moal zmd->sb[1].block += zone_nr_blocks; 1172a92fbc44SHannes Reinecke zmd->sb[1].zone = dmz_get(zmd, zone_id + i); 11733b1a94c8SDamien Le Moal } 11743b1a94c8SDamien Le Moal 11753b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 11763b1a94c8SDamien Le Moal zmd->sb[1].mblk = NULL; 1177735bd7e4SHannes Reinecke zmd->sb[1].zone = NULL; 1178bf28a3baSHannes Reinecke zmd->sb[1].dev = NULL; 11793b1a94c8SDamien Le Moal 11803b1a94c8SDamien Le Moal return -EIO; 11813b1a94c8SDamien Le Moal } 11823b1a94c8SDamien Le Moal 11833b1a94c8SDamien Le Moal /* 11843b1a94c8SDamien Le Moal * Read the first or second super block from disk. 11853b1a94c8SDamien Le Moal */ 11863b1a94c8SDamien Le Moal static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) 11873b1a94c8SDamien Le Moal { 11883b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 11893b1a94c8SDamien Le Moal int ret; 11903b1a94c8SDamien Le Moal 11913b1a94c8SDamien Le Moal /* Allocate a block */ 11923b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 11933b1a94c8SDamien Le Moal if (!mblk) 11943b1a94c8SDamien Le Moal return -ENOMEM; 11953b1a94c8SDamien Le Moal 11963b1a94c8SDamien Le Moal zmd->sb[set].mblk = mblk; 11973b1a94c8SDamien Le Moal zmd->sb[set].sb = mblk->data; 11983b1a94c8SDamien Le Moal 11993b1a94c8SDamien Le Moal /* Read super block */ 12003b1a94c8SDamien Le Moal ret = dmz_read_sb(zmd, set); 12013b1a94c8SDamien Le Moal if (ret) { 12023b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 12033b1a94c8SDamien Le Moal zmd->sb[set].mblk = NULL; 12043b1a94c8SDamien Le Moal return ret; 12053b1a94c8SDamien Le Moal } 12063b1a94c8SDamien Le Moal 12073b1a94c8SDamien Le Moal return 0; 12083b1a94c8SDamien Le Moal } 12093b1a94c8SDamien Le Moal 12103b1a94c8SDamien Le Moal /* 12113b1a94c8SDamien Le Moal * Recover a metadata set. 12123b1a94c8SDamien Le Moal */ 12133b1a94c8SDamien Le Moal static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) 12143b1a94c8SDamien Le Moal { 12153b1a94c8SDamien Le Moal unsigned int src_set = dst_set ^ 0x1; 12163b1a94c8SDamien Le Moal struct page *page; 12173b1a94c8SDamien Le Moal int i, ret; 12183b1a94c8SDamien Le Moal 1219bf28a3baSHannes Reinecke dmz_dev_warn(zmd->sb[dst_set].dev, 1220bf28a3baSHannes Reinecke "Metadata set %u invalid: recovering", dst_set); 12213b1a94c8SDamien Le Moal 12223b1a94c8SDamien Le Moal if (dst_set == 0) 1223735bd7e4SHannes Reinecke zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); 1224735bd7e4SHannes Reinecke else 1225735bd7e4SHannes Reinecke zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); 12263b1a94c8SDamien Le Moal 12274218a955SDamien Le Moal page = alloc_page(GFP_NOIO); 12283b1a94c8SDamien Le Moal if (!page) 12293b1a94c8SDamien Le Moal return -ENOMEM; 12303b1a94c8SDamien Le Moal 12313b1a94c8SDamien Le Moal /* Copy metadata blocks */ 12323b1a94c8SDamien Le Moal for (i = 1; i < zmd->nr_meta_blocks; i++) { 1233bf28a3baSHannes Reinecke ret = dmz_rdwr_block(zmd->sb[src_set].dev, REQ_OP_READ, 12343b1a94c8SDamien Le Moal zmd->sb[src_set].block + i, page); 12353b1a94c8SDamien Le Moal if (ret) 12363b1a94c8SDamien Le Moal goto out; 1237bf28a3baSHannes Reinecke ret = dmz_rdwr_block(zmd->sb[dst_set].dev, REQ_OP_WRITE, 12383b1a94c8SDamien Le Moal zmd->sb[dst_set].block + i, page); 12393b1a94c8SDamien Le Moal if (ret) 12403b1a94c8SDamien Le Moal goto out; 12413b1a94c8SDamien Le Moal } 12423b1a94c8SDamien Le Moal 12433b1a94c8SDamien Le Moal /* Finalize with the super block */ 12443b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 12453b1a94c8SDamien Le Moal zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); 12463b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 12473b1a94c8SDamien Le Moal ret = -ENOMEM; 12483b1a94c8SDamien Le Moal goto out; 12493b1a94c8SDamien Le Moal } 12503b1a94c8SDamien Le Moal zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; 12513b1a94c8SDamien Le Moal } 12523b1a94c8SDamien Le Moal 12533b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, dst_set); 12543b1a94c8SDamien Le Moal out: 12553b1a94c8SDamien Le Moal __free_pages(page, 0); 12563b1a94c8SDamien Le Moal 12573b1a94c8SDamien Le Moal return ret; 12583b1a94c8SDamien Le Moal } 12593b1a94c8SDamien Le Moal 12603b1a94c8SDamien Le Moal /* 12613b1a94c8SDamien Le Moal * Get super block from disk. 12623b1a94c8SDamien Le Moal */ 12633b1a94c8SDamien Le Moal static int dmz_load_sb(struct dmz_metadata *zmd) 12643b1a94c8SDamien Le Moal { 12653b1a94c8SDamien Le Moal bool sb_good[2] = {false, false}; 12663b1a94c8SDamien Le Moal u64 sb_gen[2] = {0, 0}; 12673b1a94c8SDamien Le Moal int ret; 12683b1a94c8SDamien Le Moal 1269735bd7e4SHannes Reinecke if (!zmd->sb[0].zone) { 1270ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Primary super block zone not set"); 1271735bd7e4SHannes Reinecke return -ENXIO; 1272735bd7e4SHannes Reinecke } 1273735bd7e4SHannes Reinecke 12743b1a94c8SDamien Le Moal /* Read and check the primary super block */ 1275735bd7e4SHannes Reinecke zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone); 1276bf28a3baSHannes Reinecke zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone); 12773b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 0); 12783b1a94c8SDamien Le Moal if (ret) { 1279bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed"); 12803b1a94c8SDamien Le Moal return ret; 12813b1a94c8SDamien Le Moal } 12823b1a94c8SDamien Le Moal 1283735bd7e4SHannes Reinecke ret = dmz_check_sb(zmd, 0); 12843b1a94c8SDamien Le Moal 12853b1a94c8SDamien Le Moal /* Read and check secondary super block */ 12863b1a94c8SDamien Le Moal if (ret == 0) { 12873b1a94c8SDamien Le Moal sb_good[0] = true; 1288a92fbc44SHannes Reinecke if (!zmd->sb[1].zone) { 1289a92fbc44SHannes Reinecke unsigned int zone_id = 1290a92fbc44SHannes Reinecke zmd->sb[0].zone->id + zmd->nr_meta_zones; 1291a92fbc44SHannes Reinecke 1292a92fbc44SHannes Reinecke zmd->sb[1].zone = dmz_get(zmd, zone_id); 1293a92fbc44SHannes Reinecke } 1294735bd7e4SHannes Reinecke zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone); 12951565929bSHannes Reinecke zmd->sb[1].dev = zmd->sb[0].dev; 12963b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 1); 12973b1a94c8SDamien Le Moal } else 12983b1a94c8SDamien Le Moal ret = dmz_lookup_secondary_sb(zmd); 12993b1a94c8SDamien Le Moal 13003b1a94c8SDamien Le Moal if (ret) { 1301bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[1].dev, "Read secondary super block failed"); 13023b1a94c8SDamien Le Moal return ret; 13033b1a94c8SDamien Le Moal } 13043b1a94c8SDamien Le Moal 1305735bd7e4SHannes Reinecke ret = dmz_check_sb(zmd, 1); 13063b1a94c8SDamien Le Moal if (ret == 0) 13073b1a94c8SDamien Le Moal sb_good[1] = true; 13083b1a94c8SDamien Le Moal 13093b1a94c8SDamien Le Moal /* Use highest generation sb first */ 13103b1a94c8SDamien Le Moal if (!sb_good[0] && !sb_good[1]) { 1311ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "No valid super block found"); 13123b1a94c8SDamien Le Moal return -EIO; 13133b1a94c8SDamien Le Moal } 13143b1a94c8SDamien Le Moal 13153b1a94c8SDamien Le Moal if (sb_good[0]) 13163b1a94c8SDamien Le Moal sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); 1317bf28a3baSHannes Reinecke else { 13183b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 0); 1319bf28a3baSHannes Reinecke if (ret) { 1320bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[0].dev, 1321bf28a3baSHannes Reinecke "Recovery of superblock 0 failed"); 1322bf28a3baSHannes Reinecke return -EIO; 1323bf28a3baSHannes Reinecke } 1324bf28a3baSHannes Reinecke } 13253b1a94c8SDamien Le Moal 13263b1a94c8SDamien Le Moal if (sb_good[1]) 13273b1a94c8SDamien Le Moal sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); 1328bf28a3baSHannes Reinecke else { 13293b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 1); 13303b1a94c8SDamien Le Moal 13313b1a94c8SDamien Le Moal if (ret) { 1332bf28a3baSHannes Reinecke dmz_dev_err(zmd->sb[1].dev, 1333bf28a3baSHannes Reinecke "Recovery of superblock 1 failed"); 13343b1a94c8SDamien Le Moal return -EIO; 13353b1a94c8SDamien Le Moal } 1336bf28a3baSHannes Reinecke } 13373b1a94c8SDamien Le Moal 13383b1a94c8SDamien Le Moal if (sb_gen[0] >= sb_gen[1]) { 13393b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[0]; 13403b1a94c8SDamien Le Moal zmd->mblk_primary = 0; 13413b1a94c8SDamien Le Moal } else { 13423b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[1]; 13433b1a94c8SDamien Le Moal zmd->mblk_primary = 1; 13443b1a94c8SDamien Le Moal } 13453b1a94c8SDamien Le Moal 1346bf28a3baSHannes Reinecke dmz_dev_debug(zmd->sb[zmd->mblk_primary].dev, 1347bf28a3baSHannes Reinecke "Using super block %u (gen %llu)", 13483b1a94c8SDamien Le Moal zmd->mblk_primary, zmd->sb_gen); 13493b1a94c8SDamien Le Moal 1350bd5c4031SHannes Reinecke if ((zmd->sb_version > 1) && zmd->sb[2].zone) { 1351bd5c4031SHannes Reinecke zmd->sb[2].block = dmz_start_block(zmd, zmd->sb[2].zone); 1352bd5c4031SHannes Reinecke zmd->sb[2].dev = dmz_zone_to_dev(zmd, zmd->sb[2].zone); 1353bd5c4031SHannes Reinecke ret = dmz_get_sb(zmd, 2); 1354bd5c4031SHannes Reinecke if (ret) { 1355bd5c4031SHannes Reinecke dmz_dev_err(zmd->sb[2].dev, 1356bd5c4031SHannes Reinecke "Read tertiary super block failed"); 1357bd5c4031SHannes Reinecke return ret; 1358bd5c4031SHannes Reinecke } 1359bd5c4031SHannes Reinecke ret = dmz_check_sb(zmd, 2); 1360bd5c4031SHannes Reinecke if (ret == -EINVAL) 1361bd5c4031SHannes Reinecke return ret; 1362bd5c4031SHannes Reinecke } 13633b1a94c8SDamien Le Moal return 0; 13643b1a94c8SDamien Le Moal } 13653b1a94c8SDamien Le Moal 13663b1a94c8SDamien Le Moal /* 13673b1a94c8SDamien Le Moal * Initialize a zone descriptor. 13683b1a94c8SDamien Le Moal */ 1369bd5c4031SHannes Reinecke static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data) 13703b1a94c8SDamien Le Moal { 1371d4100351SChristoph Hellwig struct dmz_metadata *zmd = data; 1372bd5c4031SHannes Reinecke struct dmz_dev *dev = zmd->nr_devs > 1 ? &zmd->dev[1] : &zmd->dev[0]; 1373bd5c4031SHannes Reinecke int idx = num + dev->zone_offset; 1374a92fbc44SHannes Reinecke struct dm_zone *zone; 1375a92fbc44SHannes Reinecke 1376a92fbc44SHannes Reinecke zone = dmz_insert(zmd, idx); 1377a92fbc44SHannes Reinecke if (IS_ERR(zone)) 1378a92fbc44SHannes Reinecke return PTR_ERR(zone); 13793b1a94c8SDamien Le Moal 138036820560SHannes Reinecke if (blkz->len != zmd->zone_nr_sectors) { 1381bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 1382bd5c4031SHannes Reinecke /* Ignore the eventual runt (smaller) zone */ 1383bd5c4031SHannes Reinecke set_bit(DMZ_OFFLINE, &zone->flags); 1384bd5c4031SHannes Reinecke return 0; 1385bd5c4031SHannes Reinecke } else if (blkz->start + blkz->len == dev->capacity) 13863b1a94c8SDamien Le Moal return 0; 13873b1a94c8SDamien Le Moal return -ENXIO; 13883b1a94c8SDamien Le Moal } 13893b1a94c8SDamien Le Moal 1390d4100351SChristoph Hellwig switch (blkz->type) { 1391d4100351SChristoph Hellwig case BLK_ZONE_TYPE_CONVENTIONAL: 13923b1a94c8SDamien Le Moal set_bit(DMZ_RND, &zone->flags); 1393d4100351SChristoph Hellwig break; 1394d4100351SChristoph Hellwig case BLK_ZONE_TYPE_SEQWRITE_REQ: 1395d4100351SChristoph Hellwig case BLK_ZONE_TYPE_SEQWRITE_PREF: 13963b1a94c8SDamien Le Moal set_bit(DMZ_SEQ, &zone->flags); 1397d4100351SChristoph Hellwig break; 1398d4100351SChristoph Hellwig default: 13993b1a94c8SDamien Le Moal return -ENXIO; 1400d4100351SChristoph Hellwig } 14013b1a94c8SDamien Le Moal 14023b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) 14033b1a94c8SDamien Le Moal zone->wp_block = 0; 14043b1a94c8SDamien Le Moal else 14053b1a94c8SDamien Le Moal zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); 14063b1a94c8SDamien Le Moal 1407d4100351SChristoph Hellwig if (blkz->cond == BLK_ZONE_COND_OFFLINE) 1408d4100351SChristoph Hellwig set_bit(DMZ_OFFLINE, &zone->flags); 1409d4100351SChristoph Hellwig else if (blkz->cond == BLK_ZONE_COND_READONLY) 1410d4100351SChristoph Hellwig set_bit(DMZ_READ_ONLY, &zone->flags); 1411d4100351SChristoph Hellwig else { 14123b1a94c8SDamien Le Moal zmd->nr_useable_zones++; 14133b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) { 14143b1a94c8SDamien Le Moal zmd->nr_rnd_zones++; 1415bd5c4031SHannes Reinecke if (zmd->nr_devs == 1 && !zmd->sb[0].zone) { 1416bd5c4031SHannes Reinecke /* Primary super block zone */ 1417735bd7e4SHannes Reinecke zmd->sb[0].zone = zone; 14183b1a94c8SDamien Le Moal } 14193b1a94c8SDamien Le Moal } 1420bd5c4031SHannes Reinecke if (zmd->nr_devs > 1 && !zmd->sb[2].zone) { 1421bd5c4031SHannes Reinecke /* Tertiary superblock zone */ 1422bd5c4031SHannes Reinecke zmd->sb[2].zone = zone; 1423bd5c4031SHannes Reinecke } 14243b1a94c8SDamien Le Moal } 14253b1a94c8SDamien Le Moal 14263b1a94c8SDamien Le Moal return 0; 14273b1a94c8SDamien Le Moal } 14283b1a94c8SDamien Le Moal 1429a92fbc44SHannes Reinecke static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev) 1430bd5c4031SHannes Reinecke { 1431bd5c4031SHannes Reinecke int idx; 1432bd5c4031SHannes Reinecke sector_t zone_offset = 0; 1433bd5c4031SHannes Reinecke 1434bd5c4031SHannes Reinecke for(idx = 0; idx < dev->nr_zones; idx++) { 1435a92fbc44SHannes Reinecke struct dm_zone *zone; 1436bd5c4031SHannes Reinecke 1437a92fbc44SHannes Reinecke zone = dmz_insert(zmd, idx); 1438a92fbc44SHannes Reinecke if (IS_ERR(zone)) 1439a92fbc44SHannes Reinecke return PTR_ERR(zone); 144034f5affdSHannes Reinecke set_bit(DMZ_CACHE, &zone->flags); 1441bd5c4031SHannes Reinecke zone->wp_block = 0; 144234f5affdSHannes Reinecke zmd->nr_cache_zones++; 1443bd5c4031SHannes Reinecke zmd->nr_useable_zones++; 1444bd5c4031SHannes Reinecke if (dev->capacity - zone_offset < zmd->zone_nr_sectors) { 1445bd5c4031SHannes Reinecke /* Disable runt zone */ 1446bd5c4031SHannes Reinecke set_bit(DMZ_OFFLINE, &zone->flags); 1447bd5c4031SHannes Reinecke break; 1448bd5c4031SHannes Reinecke } 1449bd5c4031SHannes Reinecke zone_offset += zmd->zone_nr_sectors; 1450bd5c4031SHannes Reinecke } 1451a92fbc44SHannes Reinecke return 0; 1452bd5c4031SHannes Reinecke } 1453bd5c4031SHannes Reinecke 14543b1a94c8SDamien Le Moal /* 14553b1a94c8SDamien Le Moal * Free zones descriptors. 14563b1a94c8SDamien Le Moal */ 14573b1a94c8SDamien Le Moal static void dmz_drop_zones(struct dmz_metadata *zmd) 14583b1a94c8SDamien Le Moal { 1459a92fbc44SHannes Reinecke int idx; 1460a92fbc44SHannes Reinecke 1461a92fbc44SHannes Reinecke for(idx = 0; idx < zmd->nr_zones; idx++) { 1462a92fbc44SHannes Reinecke struct dm_zone *zone = xa_load(&zmd->zones, idx); 1463a92fbc44SHannes Reinecke 1464a92fbc44SHannes Reinecke kfree(zone); 1465a92fbc44SHannes Reinecke xa_erase(&zmd->zones, idx); 1466a92fbc44SHannes Reinecke } 1467a92fbc44SHannes Reinecke xa_destroy(&zmd->zones); 14683b1a94c8SDamien Le Moal } 14693b1a94c8SDamien Le Moal 14703b1a94c8SDamien Le Moal /* 14713b1a94c8SDamien Le Moal * Allocate and initialize zone descriptors using the zone 14723b1a94c8SDamien Le Moal * information from disk. 14733b1a94c8SDamien Le Moal */ 14743b1a94c8SDamien Le Moal static int dmz_init_zones(struct dmz_metadata *zmd) 14753b1a94c8SDamien Le Moal { 1476bd5c4031SHannes Reinecke int i, ret; 1477bd5c4031SHannes Reinecke struct dmz_dev *zoned_dev = &zmd->dev[0]; 14783b1a94c8SDamien Le Moal 14793b1a94c8SDamien Le Moal /* Init */ 1480bd5c4031SHannes Reinecke zmd->zone_nr_sectors = zmd->dev[0].zone_nr_sectors; 148136820560SHannes Reinecke zmd->zone_nr_sectors_shift = ilog2(zmd->zone_nr_sectors); 148236820560SHannes Reinecke zmd->zone_nr_blocks = dmz_sect2blk(zmd->zone_nr_sectors); 148336820560SHannes Reinecke zmd->zone_nr_blocks_shift = ilog2(zmd->zone_nr_blocks); 148436820560SHannes Reinecke zmd->zone_bitmap_size = zmd->zone_nr_blocks >> 3; 1485b3996295SDmitry Fomichev zmd->zone_nr_bitmap_blocks = 1486b3996295SDmitry Fomichev max_t(sector_t, 1, zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT); 148736820560SHannes Reinecke zmd->zone_bits_per_mblk = min_t(sector_t, zmd->zone_nr_blocks, 1488b3996295SDmitry Fomichev DMZ_BLOCK_SIZE_BITS); 14893b1a94c8SDamien Le Moal 14903b1a94c8SDamien Le Moal /* Allocate zone array */ 1491bd5c4031SHannes Reinecke zmd->nr_zones = 0; 1492bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) 1493bd5c4031SHannes Reinecke zmd->nr_zones += zmd->dev[i].nr_zones; 1494bd5c4031SHannes Reinecke 1495bd5c4031SHannes Reinecke if (!zmd->nr_zones) { 1496bd5c4031SHannes Reinecke DMERR("(%s): No zones found", zmd->devname); 1497bd5c4031SHannes Reinecke return -ENXIO; 1498bd5c4031SHannes Reinecke } 1499a92fbc44SHannes Reinecke xa_init(&zmd->zones); 15003b1a94c8SDamien Le Moal 1501ae3c1f11SHannes Reinecke DMDEBUG("(%s): Using %zu B for zone information", 1502ca1a7045SHannes Reinecke zmd->devname, sizeof(struct dm_zone) * zmd->nr_zones); 15033b1a94c8SDamien Le Moal 1504bd5c4031SHannes Reinecke if (zmd->nr_devs > 1) { 1505a92fbc44SHannes Reinecke ret = dmz_emulate_zones(zmd, &zmd->dev[0]); 1506a92fbc44SHannes Reinecke if (ret < 0) { 1507a92fbc44SHannes Reinecke DMDEBUG("(%s): Failed to emulate zones, error %d", 1508a92fbc44SHannes Reinecke zmd->devname, ret); 1509a92fbc44SHannes Reinecke dmz_drop_zones(zmd); 1510a92fbc44SHannes Reinecke return ret; 1511a92fbc44SHannes Reinecke } 1512a92fbc44SHannes Reinecke 1513bd5c4031SHannes Reinecke /* 1514bd5c4031SHannes Reinecke * Primary superblock zone is always at zone 0 when multiple 1515bd5c4031SHannes Reinecke * drives are present. 1516bd5c4031SHannes Reinecke */ 1517a92fbc44SHannes Reinecke zmd->sb[0].zone = dmz_get(zmd, 0); 1518bd5c4031SHannes Reinecke 1519bd5c4031SHannes Reinecke zoned_dev = &zmd->dev[1]; 1520bd5c4031SHannes Reinecke } 1521bd5c4031SHannes Reinecke 15223b1a94c8SDamien Le Moal /* 1523d4100351SChristoph Hellwig * Get zone information and initialize zone descriptors. At the same 1524d4100351SChristoph Hellwig * time, determine where the super block should be: first block of the 1525d4100351SChristoph Hellwig * first randomly writable zone. 15263b1a94c8SDamien Le Moal */ 1527bd5c4031SHannes Reinecke ret = blkdev_report_zones(zoned_dev->bdev, 0, BLK_ALL_ZONES, 1528bd5c4031SHannes Reinecke dmz_init_zone, zmd); 1529d4100351SChristoph Hellwig if (ret < 0) { 1530bd5c4031SHannes Reinecke DMDEBUG("(%s): Failed to report zones, error %d", 1531bd5c4031SHannes Reinecke zmd->devname, ret); 15323b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 15333b1a94c8SDamien Le Moal return ret; 15343b1a94c8SDamien Le Moal } 15353b1a94c8SDamien Le Moal 1536d4100351SChristoph Hellwig return 0; 1537d4100351SChristoph Hellwig } 1538d4100351SChristoph Hellwig 1539d4100351SChristoph Hellwig static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx, 1540d4100351SChristoph Hellwig void *data) 1541d4100351SChristoph Hellwig { 1542d4100351SChristoph Hellwig struct dm_zone *zone = data; 1543d4100351SChristoph Hellwig 1544d4100351SChristoph Hellwig clear_bit(DMZ_OFFLINE, &zone->flags); 1545d4100351SChristoph Hellwig clear_bit(DMZ_READ_ONLY, &zone->flags); 1546d4100351SChristoph Hellwig if (blkz->cond == BLK_ZONE_COND_OFFLINE) 1547d4100351SChristoph Hellwig set_bit(DMZ_OFFLINE, &zone->flags); 1548d4100351SChristoph Hellwig else if (blkz->cond == BLK_ZONE_COND_READONLY) 1549d4100351SChristoph Hellwig set_bit(DMZ_READ_ONLY, &zone->flags); 1550d4100351SChristoph Hellwig 1551d4100351SChristoph Hellwig if (dmz_is_seq(zone)) 1552d4100351SChristoph Hellwig zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); 1553d4100351SChristoph Hellwig else 1554d4100351SChristoph Hellwig zone->wp_block = 0; 1555d4100351SChristoph Hellwig return 0; 1556d4100351SChristoph Hellwig } 1557d4100351SChristoph Hellwig 15583b1a94c8SDamien Le Moal /* 15593b1a94c8SDamien Le Moal * Update a zone information. 15603b1a94c8SDamien Le Moal */ 15613b1a94c8SDamien Le Moal static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 15623b1a94c8SDamien Le Moal { 1563aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 1564bd976e52SDamien Le Moal unsigned int noio_flag; 15653b1a94c8SDamien Le Moal int ret; 15663b1a94c8SDamien Le Moal 1567bd5c4031SHannes Reinecke if (dev->flags & DMZ_BDEV_REGULAR) 1568bd5c4031SHannes Reinecke return 0; 1569bd5c4031SHannes Reinecke 1570bd976e52SDamien Le Moal /* 1571bd976e52SDamien Le Moal * Get zone information from disk. Since blkdev_report_zones() uses 1572bd976e52SDamien Le Moal * GFP_KERNEL by default for memory allocations, set the per-task 1573bd976e52SDamien Le Moal * PF_MEMALLOC_NOIO flag so that all allocations are done as if 1574bd976e52SDamien Le Moal * GFP_NOIO was specified. 1575bd976e52SDamien Le Moal */ 1576bd976e52SDamien Le Moal noio_flag = memalloc_noio_save(); 1577aa821c8dSHannes Reinecke ret = blkdev_report_zones(dev->bdev, dmz_start_sect(zmd, zone), 1, 1578d4100351SChristoph Hellwig dmz_update_zone_cb, zone); 1579bd976e52SDamien Le Moal memalloc_noio_restore(noio_flag); 1580d4100351SChristoph Hellwig 1581d4100351SChristoph Hellwig if (ret == 0) 15827aedf75fSDamien Le Moal ret = -EIO; 1583d4100351SChristoph Hellwig if (ret < 0) { 1584aa821c8dSHannes Reinecke dmz_dev_err(dev, "Get zone %u report failed", 1585b7122873SHannes Reinecke zone->id); 1586aa821c8dSHannes Reinecke dmz_check_bdev(dev); 15873b1a94c8SDamien Le Moal return ret; 15883b1a94c8SDamien Le Moal } 15893b1a94c8SDamien Le Moal 15903b1a94c8SDamien Le Moal return 0; 15913b1a94c8SDamien Le Moal } 15923b1a94c8SDamien Le Moal 15933b1a94c8SDamien Le Moal /* 15943b1a94c8SDamien Le Moal * Check a zone write pointer position when the zone is marked 15953b1a94c8SDamien Le Moal * with the sequential write error flag. 15963b1a94c8SDamien Le Moal */ 15973b1a94c8SDamien Le Moal static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, 15983b1a94c8SDamien Le Moal struct dm_zone *zone) 15993b1a94c8SDamien Le Moal { 1600aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 16013b1a94c8SDamien Le Moal unsigned int wp = 0; 16023b1a94c8SDamien Le Moal int ret; 16033b1a94c8SDamien Le Moal 16043b1a94c8SDamien Le Moal wp = zone->wp_block; 16053b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 16063b1a94c8SDamien Le Moal if (ret) 16073b1a94c8SDamien Le Moal return ret; 16083b1a94c8SDamien Le Moal 1609aa821c8dSHannes Reinecke dmz_dev_warn(dev, "Processing zone %u write error (zone wp %u/%u)", 1610b7122873SHannes Reinecke zone->id, zone->wp_block, wp); 16113b1a94c8SDamien Le Moal 16123b1a94c8SDamien Le Moal if (zone->wp_block < wp) { 16133b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 16143b1a94c8SDamien Le Moal wp - zone->wp_block); 16153b1a94c8SDamien Le Moal } 16163b1a94c8SDamien Le Moal 16173b1a94c8SDamien Le Moal return 0; 16183b1a94c8SDamien Le Moal } 16193b1a94c8SDamien Le Moal 16203b1a94c8SDamien Le Moal /* 16213b1a94c8SDamien Le Moal * Reset a zone write pointer. 16223b1a94c8SDamien Le Moal */ 16233b1a94c8SDamien Le Moal static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 16243b1a94c8SDamien Le Moal { 16253b1a94c8SDamien Le Moal int ret; 16263b1a94c8SDamien Le Moal 16273b1a94c8SDamien Le Moal /* 16283b1a94c8SDamien Le Moal * Ignore offline zones, read only zones, 16293b1a94c8SDamien Le Moal * and conventional zones. 16303b1a94c8SDamien Le Moal */ 16313b1a94c8SDamien Le Moal if (dmz_is_offline(zone) || 16323b1a94c8SDamien Le Moal dmz_is_readonly(zone) || 16333b1a94c8SDamien Le Moal dmz_is_rnd(zone)) 16343b1a94c8SDamien Le Moal return 0; 16353b1a94c8SDamien Le Moal 16363b1a94c8SDamien Le Moal if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { 1637aa821c8dSHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 16383b1a94c8SDamien Le Moal 16396c1b1da5SAjay Joshi ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET, 16403b1a94c8SDamien Le Moal dmz_start_sect(zmd, zone), 164136820560SHannes Reinecke zmd->zone_nr_sectors, GFP_NOIO); 16423b1a94c8SDamien Le Moal if (ret) { 16433b1a94c8SDamien Le Moal dmz_dev_err(dev, "Reset zone %u failed %d", 1644b7122873SHannes Reinecke zone->id, ret); 16453b1a94c8SDamien Le Moal return ret; 16463b1a94c8SDamien Le Moal } 16473b1a94c8SDamien Le Moal } 16483b1a94c8SDamien Le Moal 16493b1a94c8SDamien Le Moal /* Clear write error bit and rewind write pointer position */ 16503b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); 16513b1a94c8SDamien Le Moal zone->wp_block = 0; 16523b1a94c8SDamien Le Moal 16533b1a94c8SDamien Le Moal return 0; 16543b1a94c8SDamien Le Moal } 16553b1a94c8SDamien Le Moal 16563b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); 16573b1a94c8SDamien Le Moal 16583b1a94c8SDamien Le Moal /* 16593b1a94c8SDamien Le Moal * Initialize chunk mapping. 16603b1a94c8SDamien Le Moal */ 16613b1a94c8SDamien Le Moal static int dmz_load_mapping(struct dmz_metadata *zmd) 16623b1a94c8SDamien Le Moal { 16633b1a94c8SDamien Le Moal struct dm_zone *dzone, *bzone; 16643b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = NULL; 16653b1a94c8SDamien Le Moal struct dmz_map *dmap; 16663b1a94c8SDamien Le Moal unsigned int i = 0, e = 0, chunk = 0; 16673b1a94c8SDamien Le Moal unsigned int dzone_id; 16683b1a94c8SDamien Le Moal unsigned int bzone_id; 16693b1a94c8SDamien Le Moal 16703b1a94c8SDamien Le Moal /* Metadata block array for the chunk mapping table */ 16713b1a94c8SDamien Le Moal zmd->map_mblk = kcalloc(zmd->nr_map_blocks, 16723b1a94c8SDamien Le Moal sizeof(struct dmz_mblk *), GFP_KERNEL); 16733b1a94c8SDamien Le Moal if (!zmd->map_mblk) 16743b1a94c8SDamien Le Moal return -ENOMEM; 16753b1a94c8SDamien Le Moal 16763b1a94c8SDamien Le Moal /* Get chunk mapping table blocks and initialize zone mapping */ 16773b1a94c8SDamien Le Moal while (chunk < zmd->nr_chunks) { 16783b1a94c8SDamien Le Moal if (!dmap_mblk) { 16793b1a94c8SDamien Le Moal /* Get mapping block */ 16803b1a94c8SDamien Le Moal dmap_mblk = dmz_get_mblock(zmd, i + 1); 16813b1a94c8SDamien Le Moal if (IS_ERR(dmap_mblk)) 16823b1a94c8SDamien Le Moal return PTR_ERR(dmap_mblk); 16833b1a94c8SDamien Le Moal zmd->map_mblk[i] = dmap_mblk; 16843b1a94c8SDamien Le Moal dmap = (struct dmz_map *) dmap_mblk->data; 16853b1a94c8SDamien Le Moal i++; 16863b1a94c8SDamien Le Moal e = 0; 16873b1a94c8SDamien Le Moal } 16883b1a94c8SDamien Le Moal 16893b1a94c8SDamien Le Moal /* Check data zone */ 16903b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[e].dzone_id); 16913b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) 16923b1a94c8SDamien Le Moal goto next; 16933b1a94c8SDamien Le Moal 169436820560SHannes Reinecke if (dzone_id >= zmd->nr_zones) { 1695ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid data zone ID %u", 16963b1a94c8SDamien Le Moal chunk, dzone_id); 16973b1a94c8SDamien Le Moal return -EIO; 16983b1a94c8SDamien Le Moal } 16993b1a94c8SDamien Le Moal 17003b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 1701a92fbc44SHannes Reinecke if (!dzone) { 1702a92fbc44SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: data zone %u not present", 1703a92fbc44SHannes Reinecke chunk, dzone_id); 1704a92fbc44SHannes Reinecke return -EIO; 1705a92fbc44SHannes Reinecke } 17063b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 17073b1a94c8SDamien Le Moal dzone->chunk = chunk; 17083b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, dzone); 17093b1a94c8SDamien Le Moal 171034f5affdSHannes Reinecke if (dmz_is_cache(dzone)) 171134f5affdSHannes Reinecke list_add_tail(&dzone->link, &zmd->map_cache_list); 171234f5affdSHannes Reinecke else if (dmz_is_rnd(dzone)) 17133b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 17143b1a94c8SDamien Le Moal else 17153b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 17163b1a94c8SDamien Le Moal 17173b1a94c8SDamien Le Moal /* Check buffer zone */ 17183b1a94c8SDamien Le Moal bzone_id = le32_to_cpu(dmap[e].bzone_id); 17193b1a94c8SDamien Le Moal if (bzone_id == DMZ_MAP_UNMAPPED) 17203b1a94c8SDamien Le Moal goto next; 17213b1a94c8SDamien Le Moal 172236820560SHannes Reinecke if (bzone_id >= zmd->nr_zones) { 1723ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone ID %u", 17243b1a94c8SDamien Le Moal chunk, bzone_id); 17253b1a94c8SDamien Le Moal return -EIO; 17263b1a94c8SDamien Le Moal } 17273b1a94c8SDamien Le Moal 17283b1a94c8SDamien Le Moal bzone = dmz_get(zmd, bzone_id); 1729a92fbc44SHannes Reinecke if (!bzone) { 1730a92fbc44SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: buffer zone %u not present", 1731a92fbc44SHannes Reinecke chunk, bzone_id); 1732a92fbc44SHannes Reinecke return -EIO; 1733a92fbc44SHannes Reinecke } 173434f5affdSHannes Reinecke if (!dmz_is_rnd(bzone) && !dmz_is_cache(bzone)) { 1735ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Chunk %u mapping: invalid buffer zone %u", 17363b1a94c8SDamien Le Moal chunk, bzone_id); 17373b1a94c8SDamien Le Moal return -EIO; 17383b1a94c8SDamien Le Moal } 17393b1a94c8SDamien Le Moal 17403b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &bzone->flags); 17413b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 17423b1a94c8SDamien Le Moal bzone->chunk = chunk; 17433b1a94c8SDamien Le Moal bzone->bzone = dzone; 17443b1a94c8SDamien Le Moal dzone->bzone = bzone; 17453b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, bzone); 174634f5affdSHannes Reinecke if (dmz_is_cache(bzone)) 174734f5affdSHannes Reinecke list_add_tail(&bzone->link, &zmd->map_cache_list); 174834f5affdSHannes Reinecke else 17493b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 17503b1a94c8SDamien Le Moal next: 17513b1a94c8SDamien Le Moal chunk++; 17523b1a94c8SDamien Le Moal e++; 17533b1a94c8SDamien Le Moal if (e >= DMZ_MAP_ENTRIES) 17543b1a94c8SDamien Le Moal dmap_mblk = NULL; 17553b1a94c8SDamien Le Moal } 17563b1a94c8SDamien Le Moal 17573b1a94c8SDamien Le Moal /* 17583b1a94c8SDamien Le Moal * At this point, only meta zones and mapped data zones were 17593b1a94c8SDamien Le Moal * fully initialized. All remaining zones are unmapped data 17603b1a94c8SDamien Le Moal * zones. Finish initializing those here. 17613b1a94c8SDamien Le Moal */ 176236820560SHannes Reinecke for (i = 0; i < zmd->nr_zones; i++) { 17633b1a94c8SDamien Le Moal dzone = dmz_get(zmd, i); 1764a92fbc44SHannes Reinecke if (!dzone) 1765a92fbc44SHannes Reinecke continue; 17663b1a94c8SDamien Le Moal if (dmz_is_meta(dzone)) 17673b1a94c8SDamien Le Moal continue; 176834f5affdSHannes Reinecke if (dmz_is_offline(dzone)) 176934f5affdSHannes Reinecke continue; 17703b1a94c8SDamien Le Moal 177134f5affdSHannes Reinecke if (dmz_is_cache(dzone)) 177234f5affdSHannes Reinecke zmd->nr_cache++; 177334f5affdSHannes Reinecke else if (dmz_is_rnd(dzone)) 17743b1a94c8SDamien Le Moal zmd->nr_rnd++; 17753b1a94c8SDamien Le Moal else 17763b1a94c8SDamien Le Moal zmd->nr_seq++; 17773b1a94c8SDamien Le Moal 17783b1a94c8SDamien Le Moal if (dmz_is_data(dzone)) { 17793b1a94c8SDamien Le Moal /* Already initialized */ 17803b1a94c8SDamien Le Moal continue; 17813b1a94c8SDamien Le Moal } 17823b1a94c8SDamien Le Moal 17833b1a94c8SDamien Le Moal /* Unmapped data zone */ 17843b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 17853b1a94c8SDamien Le Moal dzone->chunk = DMZ_MAP_UNMAPPED; 178634f5affdSHannes Reinecke if (dmz_is_cache(dzone)) { 178734f5affdSHannes Reinecke list_add_tail(&dzone->link, &zmd->unmap_cache_list); 178834f5affdSHannes Reinecke atomic_inc(&zmd->unmap_nr_cache); 178934f5affdSHannes Reinecke } else if (dmz_is_rnd(dzone)) { 17903b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_rnd_list); 17913b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 17923b1a94c8SDamien Le Moal } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { 17933b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); 1794aec67b4fSHannes Reinecke set_bit(DMZ_RESERVED, &dzone->flags); 17953b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 17963b1a94c8SDamien Le Moal zmd->nr_seq--; 17973b1a94c8SDamien Le Moal } else { 17983b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_seq_list); 17993b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 18003b1a94c8SDamien Le Moal } 18013b1a94c8SDamien Le Moal } 18023b1a94c8SDamien Le Moal 18033b1a94c8SDamien Le Moal return 0; 18043b1a94c8SDamien Le Moal } 18053b1a94c8SDamien Le Moal 18063b1a94c8SDamien Le Moal /* 18073b1a94c8SDamien Le Moal * Set a data chunk mapping. 18083b1a94c8SDamien Le Moal */ 18093b1a94c8SDamien Le Moal static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, 18103b1a94c8SDamien Le Moal unsigned int dzone_id, unsigned int bzone_id) 18113b1a94c8SDamien Le Moal { 18123b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 18133b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 18143b1a94c8SDamien Le Moal int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; 18153b1a94c8SDamien Le Moal 18163b1a94c8SDamien Le Moal dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); 18173b1a94c8SDamien Le Moal dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); 18183b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, dmap_mblk); 18193b1a94c8SDamien Le Moal } 18203b1a94c8SDamien Le Moal 18213b1a94c8SDamien Le Moal /* 18223b1a94c8SDamien Le Moal * The list of mapped zones is maintained in LRU order. 18233b1a94c8SDamien Le Moal * This rotates a zone at the end of its map list. 18243b1a94c8SDamien Le Moal */ 18253b1a94c8SDamien Le Moal static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 18263b1a94c8SDamien Le Moal { 18273b1a94c8SDamien Le Moal if (list_empty(&zone->link)) 18283b1a94c8SDamien Le Moal return; 18293b1a94c8SDamien Le Moal 18303b1a94c8SDamien Le Moal list_del_init(&zone->link); 18313b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) { 18323b1a94c8SDamien Le Moal /* LRU rotate sequential zone */ 18333b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_seq_list); 183434f5affdSHannes Reinecke } else if (dmz_is_cache(zone)) { 183534f5affdSHannes Reinecke /* LRU rotate cache zone */ 183634f5affdSHannes Reinecke list_add_tail(&zone->link, &zmd->map_cache_list); 18373b1a94c8SDamien Le Moal } else { 18383b1a94c8SDamien Le Moal /* LRU rotate random zone */ 18393b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_rnd_list); 18403b1a94c8SDamien Le Moal } 18413b1a94c8SDamien Le Moal } 18423b1a94c8SDamien Le Moal 18433b1a94c8SDamien Le Moal /* 18443b1a94c8SDamien Le Moal * The list of mapped random zones is maintained 18453b1a94c8SDamien Le Moal * in LRU order. This rotates a zone at the end of the list. 18463b1a94c8SDamien Le Moal */ 18473b1a94c8SDamien Le Moal static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 18483b1a94c8SDamien Le Moal { 18493b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone); 18503b1a94c8SDamien Le Moal if (zone->bzone) 18513b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone->bzone); 18523b1a94c8SDamien Le Moal } 18533b1a94c8SDamien Le Moal 18543b1a94c8SDamien Le Moal /* 18553b1a94c8SDamien Le Moal * Wait for any zone to be freed. 18563b1a94c8SDamien Le Moal */ 18573b1a94c8SDamien Le Moal static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) 18583b1a94c8SDamien Le Moal { 18593b1a94c8SDamien Le Moal DEFINE_WAIT(wait); 18603b1a94c8SDamien Le Moal 18613b1a94c8SDamien Le Moal prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); 18623b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 18633b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 18643b1a94c8SDamien Le Moal 18653b1a94c8SDamien Le Moal io_schedule_timeout(HZ); 18663b1a94c8SDamien Le Moal 18673b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 18683b1a94c8SDamien Le Moal dmz_lock_map(zmd); 18693b1a94c8SDamien Le Moal finish_wait(&zmd->free_wq, &wait); 18703b1a94c8SDamien Le Moal } 18713b1a94c8SDamien Le Moal 18723b1a94c8SDamien Le Moal /* 18733b1a94c8SDamien Le Moal * Lock a zone for reclaim (set the zone RECLAIM bit). 18743b1a94c8SDamien Le Moal * Returns false if the zone cannot be locked or if it is already locked 18753b1a94c8SDamien Le Moal * and 1 otherwise. 18763b1a94c8SDamien Le Moal */ 18773b1a94c8SDamien Le Moal int dmz_lock_zone_reclaim(struct dm_zone *zone) 18783b1a94c8SDamien Le Moal { 18793b1a94c8SDamien Le Moal /* Active zones cannot be reclaimed */ 18803b1a94c8SDamien Le Moal if (dmz_is_active(zone)) 18813b1a94c8SDamien Le Moal return 0; 18823b1a94c8SDamien Le Moal 18833b1a94c8SDamien Le Moal return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); 18843b1a94c8SDamien Le Moal } 18853b1a94c8SDamien Le Moal 18863b1a94c8SDamien Le Moal /* 18873b1a94c8SDamien Le Moal * Clear a zone reclaim flag. 18883b1a94c8SDamien Le Moal */ 18893b1a94c8SDamien Le Moal void dmz_unlock_zone_reclaim(struct dm_zone *zone) 18903b1a94c8SDamien Le Moal { 18913b1a94c8SDamien Le Moal WARN_ON(dmz_is_active(zone)); 18923b1a94c8SDamien Le Moal WARN_ON(!dmz_in_reclaim(zone)); 18933b1a94c8SDamien Le Moal 18943b1a94c8SDamien Le Moal clear_bit_unlock(DMZ_RECLAIM, &zone->flags); 18953b1a94c8SDamien Le Moal smp_mb__after_atomic(); 18963b1a94c8SDamien Le Moal wake_up_bit(&zone->flags, DMZ_RECLAIM); 18973b1a94c8SDamien Le Moal } 18983b1a94c8SDamien Le Moal 18993b1a94c8SDamien Le Moal /* 19003b1a94c8SDamien Le Moal * Wait for a zone reclaim to complete. 19013b1a94c8SDamien Le Moal */ 19023b1a94c8SDamien Le Moal static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) 19033b1a94c8SDamien Le Moal { 19043b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 19053b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 1906a16b7deeSHannes Reinecke set_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); 19073b1a94c8SDamien Le Moal wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); 1908a16b7deeSHannes Reinecke clear_bit(DMZ_RECLAIM_TERMINATE, &zone->flags); 19093b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 19103b1a94c8SDamien Le Moal dmz_lock_map(zmd); 19113b1a94c8SDamien Le Moal } 19123b1a94c8SDamien Le Moal 19133b1a94c8SDamien Le Moal /* 191434f5affdSHannes Reinecke * Select a cache or random write zone for reclaim. 19153b1a94c8SDamien Le Moal */ 191690a9b869SHannes Reinecke static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd, 191790a9b869SHannes Reinecke bool idle) 19183b1a94c8SDamien Le Moal { 19193b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 19203b1a94c8SDamien Le Moal struct dm_zone *zone; 192134f5affdSHannes Reinecke struct list_head *zone_list = &zmd->map_rnd_list; 19223b1a94c8SDamien Le Moal 192334f5affdSHannes Reinecke /* If we have cache zones select from the cache zone list */ 192490a9b869SHannes Reinecke if (zmd->nr_cache) { 192534f5affdSHannes Reinecke zone_list = &zmd->map_cache_list; 192690a9b869SHannes Reinecke /* Try to relaim random zones, too, when idle */ 192790a9b869SHannes Reinecke if (idle && list_empty(zone_list)) 192890a9b869SHannes Reinecke zone_list = &zmd->map_rnd_list; 192990a9b869SHannes Reinecke } 19303b1a94c8SDamien Le Moal 193134f5affdSHannes Reinecke list_for_each_entry(zone, zone_list, link) { 19323b1a94c8SDamien Le Moal if (dmz_is_buf(zone)) 19333b1a94c8SDamien Le Moal dzone = zone->bzone; 19343b1a94c8SDamien Le Moal else 19353b1a94c8SDamien Le Moal dzone = zone; 19363b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(dzone)) 19373b1a94c8SDamien Le Moal return dzone; 19383b1a94c8SDamien Le Moal } 19393b1a94c8SDamien Le Moal 1940489dc0f0SHannes Reinecke return NULL; 19413b1a94c8SDamien Le Moal } 19423b1a94c8SDamien Le Moal 19433b1a94c8SDamien Le Moal /* 19443b1a94c8SDamien Le Moal * Select a buffered sequential zone for reclaim. 19453b1a94c8SDamien Le Moal */ 19463b1a94c8SDamien Le Moal static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) 19473b1a94c8SDamien Le Moal { 19483b1a94c8SDamien Le Moal struct dm_zone *zone; 19493b1a94c8SDamien Le Moal 19503b1a94c8SDamien Le Moal list_for_each_entry(zone, &zmd->map_seq_list, link) { 19513b1a94c8SDamien Le Moal if (!zone->bzone) 19523b1a94c8SDamien Le Moal continue; 19533b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(zone)) 19543b1a94c8SDamien Le Moal return zone; 19553b1a94c8SDamien Le Moal } 19563b1a94c8SDamien Le Moal 1957489dc0f0SHannes Reinecke return NULL; 19583b1a94c8SDamien Le Moal } 19593b1a94c8SDamien Le Moal 19603b1a94c8SDamien Le Moal /* 19613b1a94c8SDamien Le Moal * Select a zone for reclaim. 19623b1a94c8SDamien Le Moal */ 196390a9b869SHannes Reinecke struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd, bool idle) 19643b1a94c8SDamien Le Moal { 19653b1a94c8SDamien Le Moal struct dm_zone *zone; 19663b1a94c8SDamien Le Moal 19673b1a94c8SDamien Le Moal /* 19683b1a94c8SDamien Le Moal * Search for a zone candidate to reclaim: 2 cases are possible. 19693b1a94c8SDamien Le Moal * (1) There is no free sequential zones. Then a random data zone 19703b1a94c8SDamien Le Moal * cannot be reclaimed. So choose a sequential zone to reclaim so 19713b1a94c8SDamien Le Moal * that afterward a random zone can be reclaimed. 19723b1a94c8SDamien Le Moal * (2) At least one free sequential zone is available, then choose 19733b1a94c8SDamien Le Moal * the oldest random zone (data or buffer) that can be locked. 19743b1a94c8SDamien Le Moal */ 19753b1a94c8SDamien Le Moal dmz_lock_map(zmd); 19763b1a94c8SDamien Le Moal if (list_empty(&zmd->reserved_seq_zones_list)) 19773b1a94c8SDamien Le Moal zone = dmz_get_seq_zone_for_reclaim(zmd); 19783b1a94c8SDamien Le Moal else 197990a9b869SHannes Reinecke zone = dmz_get_rnd_zone_for_reclaim(zmd, idle); 19803b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 19813b1a94c8SDamien Le Moal 19823b1a94c8SDamien Le Moal return zone; 19833b1a94c8SDamien Le Moal } 19843b1a94c8SDamien Le Moal 19853b1a94c8SDamien Le Moal /* 19863b1a94c8SDamien Le Moal * Get the zone mapping a chunk, if the chunk is mapped already. 19873b1a94c8SDamien Le Moal * If no mapping exist and the operation is WRITE, a zone is 19883b1a94c8SDamien Le Moal * allocated and used to map the chunk. 19893b1a94c8SDamien Le Moal * The zone returned will be set to the active state. 19903b1a94c8SDamien Le Moal */ 19913b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) 19923b1a94c8SDamien Le Moal { 19933b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 19943b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 19953b1a94c8SDamien Le Moal int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; 19963b1a94c8SDamien Le Moal unsigned int dzone_id; 19973b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 19983b1a94c8SDamien Le Moal int ret = 0; 199934f5affdSHannes Reinecke int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; 20003b1a94c8SDamien Le Moal 20013b1a94c8SDamien Le Moal dmz_lock_map(zmd); 20023b1a94c8SDamien Le Moal again: 20033b1a94c8SDamien Le Moal /* Get the chunk mapping */ 20043b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); 20053b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) { 20063b1a94c8SDamien Le Moal /* 20073b1a94c8SDamien Le Moal * Read or discard in unmapped chunks are fine. But for 20083b1a94c8SDamien Le Moal * writes, we need a mapping, so get one. 20093b1a94c8SDamien Le Moal */ 20103b1a94c8SDamien Le Moal if (op != REQ_OP_WRITE) 20113b1a94c8SDamien Le Moal goto out; 20123b1a94c8SDamien Le Moal 2013ad1bd578SDmitry Fomichev /* Allocate a random zone */ 201434f5affdSHannes Reinecke dzone = dmz_alloc_zone(zmd, alloc_flags); 20153b1a94c8SDamien Le Moal if (!dzone) { 2016d0e21ce4SHannes Reinecke if (dmz_dev_is_dying(zmd)) { 201775d66ffbSDmitry Fomichev dzone = ERR_PTR(-EIO); 201875d66ffbSDmitry Fomichev goto out; 201975d66ffbSDmitry Fomichev } 20203b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 20213b1a94c8SDamien Le Moal goto again; 20223b1a94c8SDamien Le Moal } 20233b1a94c8SDamien Le Moal 20243b1a94c8SDamien Le Moal dmz_map_zone(zmd, dzone, chunk); 20253b1a94c8SDamien Le Moal 20263b1a94c8SDamien Le Moal } else { 20273b1a94c8SDamien Le Moal /* The chunk is already mapped: get the mapping zone */ 20283b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 2029a92fbc44SHannes Reinecke if (!dzone) { 2030a92fbc44SHannes Reinecke dzone = ERR_PTR(-EIO); 2031a92fbc44SHannes Reinecke goto out; 2032a92fbc44SHannes Reinecke } 20333b1a94c8SDamien Le Moal if (dzone->chunk != chunk) { 20343b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 20353b1a94c8SDamien Le Moal goto out; 20363b1a94c8SDamien Le Moal } 20373b1a94c8SDamien Le Moal 20383b1a94c8SDamien Le Moal /* Repair write pointer if the sequential dzone has error */ 20393b1a94c8SDamien Le Moal if (dmz_seq_write_err(dzone)) { 20403b1a94c8SDamien Le Moal ret = dmz_handle_seq_write_err(zmd, dzone); 20413b1a94c8SDamien Le Moal if (ret) { 20423b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 20433b1a94c8SDamien Le Moal goto out; 20443b1a94c8SDamien Le Moal } 20453b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); 20463b1a94c8SDamien Le Moal } 20473b1a94c8SDamien Le Moal } 20483b1a94c8SDamien Le Moal 20493b1a94c8SDamien Le Moal /* 20503b1a94c8SDamien Le Moal * If the zone is being reclaimed, the chunk mapping may change 20513b1a94c8SDamien Le Moal * to a different zone. So wait for reclaim and retry. Otherwise, 20523b1a94c8SDamien Le Moal * activate the zone (this will prevent reclaim from touching it). 20533b1a94c8SDamien Le Moal */ 20543b1a94c8SDamien Le Moal if (dmz_in_reclaim(dzone)) { 20553b1a94c8SDamien Le Moal dmz_wait_for_reclaim(zmd, dzone); 20563b1a94c8SDamien Le Moal goto again; 20573b1a94c8SDamien Le Moal } 20583b1a94c8SDamien Le Moal dmz_activate_zone(dzone); 20593b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 20603b1a94c8SDamien Le Moal out: 20613b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 20623b1a94c8SDamien Le Moal 20633b1a94c8SDamien Le Moal return dzone; 20643b1a94c8SDamien Le Moal } 20653b1a94c8SDamien Le Moal 20663b1a94c8SDamien Le Moal /* 20673b1a94c8SDamien Le Moal * Write and discard change the block validity of data zones and their buffer 20683b1a94c8SDamien Le Moal * zones. Check here that valid blocks are still present. If all blocks are 20693b1a94c8SDamien Le Moal * invalid, the zones can be unmapped on the fly without waiting for reclaim 20703b1a94c8SDamien Le Moal * to do it. 20713b1a94c8SDamien Le Moal */ 20723b1a94c8SDamien Le Moal void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) 20733b1a94c8SDamien Le Moal { 20743b1a94c8SDamien Le Moal struct dm_zone *bzone; 20753b1a94c8SDamien Le Moal 20763b1a94c8SDamien Le Moal dmz_lock_map(zmd); 20773b1a94c8SDamien Le Moal 20783b1a94c8SDamien Le Moal bzone = dzone->bzone; 20793b1a94c8SDamien Le Moal if (bzone) { 20803b1a94c8SDamien Le Moal if (dmz_weight(bzone)) 20813b1a94c8SDamien Le Moal dmz_lru_zone(zmd, bzone); 20823b1a94c8SDamien Le Moal else { 20833b1a94c8SDamien Le Moal /* Empty buffer zone: reclaim it */ 20843b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, bzone); 20853b1a94c8SDamien Le Moal dmz_free_zone(zmd, bzone); 20863b1a94c8SDamien Le Moal bzone = NULL; 20873b1a94c8SDamien Le Moal } 20883b1a94c8SDamien Le Moal } 20893b1a94c8SDamien Le Moal 20903b1a94c8SDamien Le Moal /* Deactivate the data zone */ 20913b1a94c8SDamien Le Moal dmz_deactivate_zone(dzone); 20923b1a94c8SDamien Le Moal if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) 20933b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 20943b1a94c8SDamien Le Moal else { 20953b1a94c8SDamien Le Moal /* Unbuffered inactive empty data zone: reclaim it */ 20963b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, dzone); 20973b1a94c8SDamien Le Moal dmz_free_zone(zmd, dzone); 20983b1a94c8SDamien Le Moal } 20993b1a94c8SDamien Le Moal 21003b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 21013b1a94c8SDamien Le Moal } 21023b1a94c8SDamien Le Moal 21033b1a94c8SDamien Le Moal /* 21043b1a94c8SDamien Le Moal * Allocate and map a random zone to buffer a chunk 21053b1a94c8SDamien Le Moal * already mapped to a sequential zone. 21063b1a94c8SDamien Le Moal */ 21073b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, 21083b1a94c8SDamien Le Moal struct dm_zone *dzone) 21093b1a94c8SDamien Le Moal { 21103b1a94c8SDamien Le Moal struct dm_zone *bzone; 211134f5affdSHannes Reinecke int alloc_flags = zmd->nr_cache ? DMZ_ALLOC_CACHE : DMZ_ALLOC_RND; 21123b1a94c8SDamien Le Moal 21133b1a94c8SDamien Le Moal dmz_lock_map(zmd); 21143b1a94c8SDamien Le Moal again: 21153b1a94c8SDamien Le Moal bzone = dzone->bzone; 21163b1a94c8SDamien Le Moal if (bzone) 21173b1a94c8SDamien Le Moal goto out; 21183b1a94c8SDamien Le Moal 2119ad1bd578SDmitry Fomichev /* Allocate a random zone */ 212034f5affdSHannes Reinecke bzone = dmz_alloc_zone(zmd, alloc_flags); 21213b1a94c8SDamien Le Moal if (!bzone) { 2122d0e21ce4SHannes Reinecke if (dmz_dev_is_dying(zmd)) { 212375d66ffbSDmitry Fomichev bzone = ERR_PTR(-EIO); 212475d66ffbSDmitry Fomichev goto out; 212575d66ffbSDmitry Fomichev } 21263b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 21273b1a94c8SDamien Le Moal goto again; 21283b1a94c8SDamien Le Moal } 21293b1a94c8SDamien Le Moal 21303b1a94c8SDamien Le Moal /* Update the chunk mapping */ 2131b7122873SHannes Reinecke dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id); 21323b1a94c8SDamien Le Moal 21333b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 21343b1a94c8SDamien Le Moal bzone->chunk = dzone->chunk; 21353b1a94c8SDamien Le Moal bzone->bzone = dzone; 21363b1a94c8SDamien Le Moal dzone->bzone = bzone; 213734f5affdSHannes Reinecke if (dmz_is_cache(bzone)) 213834f5affdSHannes Reinecke list_add_tail(&bzone->link, &zmd->map_cache_list); 213934f5affdSHannes Reinecke else 21403b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 21413b1a94c8SDamien Le Moal out: 21423b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 21433b1a94c8SDamien Le Moal 21443b1a94c8SDamien Le Moal return bzone; 21453b1a94c8SDamien Le Moal } 21463b1a94c8SDamien Le Moal 21473b1a94c8SDamien Le Moal /* 21483b1a94c8SDamien Le Moal * Get an unmapped (free) zone. 21493b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 21503b1a94c8SDamien Le Moal */ 21513b1a94c8SDamien Le Moal struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) 21523b1a94c8SDamien Le Moal { 21533b1a94c8SDamien Le Moal struct list_head *list; 21543b1a94c8SDamien Le Moal struct dm_zone *zone; 21553b1a94c8SDamien Le Moal 215634f5affdSHannes Reinecke if (flags & DMZ_ALLOC_CACHE) 215734f5affdSHannes Reinecke list = &zmd->unmap_cache_list; 215834f5affdSHannes Reinecke else if (flags & DMZ_ALLOC_RND) 21593b1a94c8SDamien Le Moal list = &zmd->unmap_rnd_list; 21603b1a94c8SDamien Le Moal else 21613b1a94c8SDamien Le Moal list = &zmd->unmap_seq_list; 216234f5affdSHannes Reinecke 21633b1a94c8SDamien Le Moal again: 21643b1a94c8SDamien Le Moal if (list_empty(list)) { 21653b1a94c8SDamien Le Moal /* 216634f5affdSHannes Reinecke * No free zone: return NULL if this is for not reclaim. 21673b1a94c8SDamien Le Moal */ 216834f5affdSHannes Reinecke if (!(flags & DMZ_ALLOC_RECLAIM)) 21693b1a94c8SDamien Le Moal return NULL; 217034f5affdSHannes Reinecke /* 217134f5affdSHannes Reinecke * Fallback to the reserved sequential zones 217234f5affdSHannes Reinecke */ 217334f5affdSHannes Reinecke zone = list_first_entry_or_null(&zmd->reserved_seq_zones_list, 21743b1a94c8SDamien Le Moal struct dm_zone, link); 217534f5affdSHannes Reinecke if (zone) { 21763b1a94c8SDamien Le Moal list_del_init(&zone->link); 21773b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_reserved_seq_zones); 217834f5affdSHannes Reinecke } 21793b1a94c8SDamien Le Moal return zone; 21803b1a94c8SDamien Le Moal } 21813b1a94c8SDamien Le Moal 21823b1a94c8SDamien Le Moal zone = list_first_entry(list, struct dm_zone, link); 21833b1a94c8SDamien Le Moal list_del_init(&zone->link); 21843b1a94c8SDamien Le Moal 218534f5affdSHannes Reinecke if (dmz_is_cache(zone)) 218634f5affdSHannes Reinecke atomic_dec(&zmd->unmap_nr_cache); 218734f5affdSHannes Reinecke else if (dmz_is_rnd(zone)) 21883b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_rnd); 21893b1a94c8SDamien Le Moal else 21903b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_seq); 21913b1a94c8SDamien Le Moal 21923b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 2193ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u is offline", zone->id); 21943b1a94c8SDamien Le Moal zone = NULL; 21953b1a94c8SDamien Le Moal goto again; 21963b1a94c8SDamien Le Moal } 2197dc076c83SHannes Reinecke if (dmz_is_meta(zone)) { 2198dc076c83SHannes Reinecke struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone); 21993b1a94c8SDamien Le Moal 2200dc076c83SHannes Reinecke dmz_dev_warn(dev, "Zone %u has metadata", zone->id); 2201dc076c83SHannes Reinecke zone = NULL; 2202dc076c83SHannes Reinecke goto again; 2203dc076c83SHannes Reinecke } 22043b1a94c8SDamien Le Moal return zone; 22053b1a94c8SDamien Le Moal } 22063b1a94c8SDamien Le Moal 22073b1a94c8SDamien Le Moal /* 22083b1a94c8SDamien Le Moal * Free a zone. 22093b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 22103b1a94c8SDamien Le Moal */ 22113b1a94c8SDamien Le Moal void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 22123b1a94c8SDamien Le Moal { 22133b1a94c8SDamien Le Moal /* If this is a sequential zone, reset it */ 22143b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) 22153b1a94c8SDamien Le Moal dmz_reset_zone(zmd, zone); 22163b1a94c8SDamien Le Moal 22173b1a94c8SDamien Le Moal /* Return the zone to its type unmap list */ 221834f5affdSHannes Reinecke if (dmz_is_cache(zone)) { 221934f5affdSHannes Reinecke list_add_tail(&zone->link, &zmd->unmap_cache_list); 222034f5affdSHannes Reinecke atomic_inc(&zmd->unmap_nr_cache); 222134f5affdSHannes Reinecke } else if (dmz_is_rnd(zone)) { 22223b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_rnd_list); 22233b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 2224aec67b4fSHannes Reinecke } else if (dmz_is_reserved(zone)) { 22253b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); 22263b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 22273b1a94c8SDamien Le Moal } else { 22283b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_seq_list); 22293b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 22303b1a94c8SDamien Le Moal } 22313b1a94c8SDamien Le Moal 22323b1a94c8SDamien Le Moal wake_up_all(&zmd->free_wq); 22333b1a94c8SDamien Le Moal } 22343b1a94c8SDamien Le Moal 22353b1a94c8SDamien Le Moal /* 22363b1a94c8SDamien Le Moal * Map a chunk to a zone. 22373b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 22383b1a94c8SDamien Le Moal */ 22393b1a94c8SDamien Le Moal void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, 22403b1a94c8SDamien Le Moal unsigned int chunk) 22413b1a94c8SDamien Le Moal { 22423b1a94c8SDamien Le Moal /* Set the chunk mapping */ 2243b7122873SHannes Reinecke dmz_set_chunk_mapping(zmd, chunk, dzone->id, 22443b1a94c8SDamien Le Moal DMZ_MAP_UNMAPPED); 22453b1a94c8SDamien Le Moal dzone->chunk = chunk; 224634f5affdSHannes Reinecke if (dmz_is_cache(dzone)) 224734f5affdSHannes Reinecke list_add_tail(&dzone->link, &zmd->map_cache_list); 224834f5affdSHannes Reinecke else if (dmz_is_rnd(dzone)) 22493b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 22503b1a94c8SDamien Le Moal else 22513b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 22523b1a94c8SDamien Le Moal } 22533b1a94c8SDamien Le Moal 22543b1a94c8SDamien Le Moal /* 22553b1a94c8SDamien Le Moal * Unmap a zone. 22563b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 22573b1a94c8SDamien Le Moal */ 22583b1a94c8SDamien Le Moal void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 22593b1a94c8SDamien Le Moal { 22603b1a94c8SDamien Le Moal unsigned int chunk = zone->chunk; 22613b1a94c8SDamien Le Moal unsigned int dzone_id; 22623b1a94c8SDamien Le Moal 22633b1a94c8SDamien Le Moal if (chunk == DMZ_MAP_UNMAPPED) { 22643b1a94c8SDamien Le Moal /* Already unmapped */ 22653b1a94c8SDamien Le Moal return; 22663b1a94c8SDamien Le Moal } 22673b1a94c8SDamien Le Moal 22683b1a94c8SDamien Le Moal if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { 22693b1a94c8SDamien Le Moal /* 22703b1a94c8SDamien Le Moal * Unmapping the chunk buffer zone: clear only 22713b1a94c8SDamien Le Moal * the chunk buffer mapping 22723b1a94c8SDamien Le Moal */ 2273b7122873SHannes Reinecke dzone_id = zone->bzone->id; 22743b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 22753b1a94c8SDamien Le Moal zone->bzone = NULL; 22763b1a94c8SDamien Le Moal 22773b1a94c8SDamien Le Moal } else { 22783b1a94c8SDamien Le Moal /* 22793b1a94c8SDamien Le Moal * Unmapping the chunk data zone: the zone must 22803b1a94c8SDamien Le Moal * not be buffered. 22813b1a94c8SDamien Le Moal */ 22823b1a94c8SDamien Le Moal if (WARN_ON(zone->bzone)) { 22833b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 22843b1a94c8SDamien Le Moal zone->bzone = NULL; 22853b1a94c8SDamien Le Moal } 22863b1a94c8SDamien Le Moal dzone_id = DMZ_MAP_UNMAPPED; 22873b1a94c8SDamien Le Moal } 22883b1a94c8SDamien Le Moal 22893b1a94c8SDamien Le Moal dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); 22903b1a94c8SDamien Le Moal 22913b1a94c8SDamien Le Moal zone->chunk = DMZ_MAP_UNMAPPED; 22923b1a94c8SDamien Le Moal list_del_init(&zone->link); 22933b1a94c8SDamien Le Moal } 22943b1a94c8SDamien Le Moal 22953b1a94c8SDamien Le Moal /* 22963b1a94c8SDamien Le Moal * Set @nr_bits bits in @bitmap starting from @bit. 22973b1a94c8SDamien Le Moal * Return the number of bits changed from 0 to 1. 22983b1a94c8SDamien Le Moal */ 22993b1a94c8SDamien Le Moal static unsigned int dmz_set_bits(unsigned long *bitmap, 23003b1a94c8SDamien Le Moal unsigned int bit, unsigned int nr_bits) 23013b1a94c8SDamien Le Moal { 23023b1a94c8SDamien Le Moal unsigned long *addr; 23033b1a94c8SDamien Le Moal unsigned int end = bit + nr_bits; 23043b1a94c8SDamien Le Moal unsigned int n = 0; 23053b1a94c8SDamien Le Moal 23063b1a94c8SDamien Le Moal while (bit < end) { 23073b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 23083b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 23093b1a94c8SDamien Le Moal /* Try to set the whole word at once */ 23103b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 23113b1a94c8SDamien Le Moal if (*addr == 0) { 23123b1a94c8SDamien Le Moal *addr = ULONG_MAX; 23133b1a94c8SDamien Le Moal n += BITS_PER_LONG; 23143b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 23153b1a94c8SDamien Le Moal continue; 23163b1a94c8SDamien Le Moal } 23173b1a94c8SDamien Le Moal } 23183b1a94c8SDamien Le Moal 23193b1a94c8SDamien Le Moal if (!test_and_set_bit(bit, bitmap)) 23203b1a94c8SDamien Le Moal n++; 23213b1a94c8SDamien Le Moal bit++; 23223b1a94c8SDamien Le Moal } 23233b1a94c8SDamien Le Moal 23243b1a94c8SDamien Le Moal return n; 23253b1a94c8SDamien Le Moal } 23263b1a94c8SDamien Le Moal 23273b1a94c8SDamien Le Moal /* 23283b1a94c8SDamien Le Moal * Get the bitmap block storing the bit for chunk_block in zone. 23293b1a94c8SDamien Le Moal */ 23303b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, 23313b1a94c8SDamien Le Moal struct dm_zone *zone, 23323b1a94c8SDamien Le Moal sector_t chunk_block) 23333b1a94c8SDamien Le Moal { 23343b1a94c8SDamien Le Moal sector_t bitmap_block = 1 + zmd->nr_map_blocks + 2335b7122873SHannes Reinecke (sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) + 23363b1a94c8SDamien Le Moal (chunk_block >> DMZ_BLOCK_SHIFT_BITS); 23373b1a94c8SDamien Le Moal 23383b1a94c8SDamien Le Moal return dmz_get_mblock(zmd, bitmap_block); 23393b1a94c8SDamien Le Moal } 23403b1a94c8SDamien Le Moal 23413b1a94c8SDamien Le Moal /* 23423b1a94c8SDamien Le Moal * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. 23433b1a94c8SDamien Le Moal */ 23443b1a94c8SDamien Le Moal int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 23453b1a94c8SDamien Le Moal struct dm_zone *to_zone) 23463b1a94c8SDamien Le Moal { 23473b1a94c8SDamien Le Moal struct dmz_mblock *from_mblk, *to_mblk; 23483b1a94c8SDamien Le Moal sector_t chunk_block = 0; 23493b1a94c8SDamien Le Moal 23503b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 235136820560SHannes Reinecke while (chunk_block < zmd->zone_nr_blocks) { 23523b1a94c8SDamien Le Moal from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); 23533b1a94c8SDamien Le Moal if (IS_ERR(from_mblk)) 23543b1a94c8SDamien Le Moal return PTR_ERR(from_mblk); 23553b1a94c8SDamien Le Moal to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); 23563b1a94c8SDamien Le Moal if (IS_ERR(to_mblk)) { 23573b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 23583b1a94c8SDamien Le Moal return PTR_ERR(to_mblk); 23593b1a94c8SDamien Le Moal } 23603b1a94c8SDamien Le Moal 23613b1a94c8SDamien Le Moal memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); 23623b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, to_mblk); 23633b1a94c8SDamien Le Moal 23643b1a94c8SDamien Le Moal dmz_release_mblock(zmd, to_mblk); 23653b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 23663b1a94c8SDamien Le Moal 2367b3996295SDmitry Fomichev chunk_block += zmd->zone_bits_per_mblk; 23683b1a94c8SDamien Le Moal } 23693b1a94c8SDamien Le Moal 23703b1a94c8SDamien Le Moal to_zone->weight = from_zone->weight; 23713b1a94c8SDamien Le Moal 23723b1a94c8SDamien Le Moal return 0; 23733b1a94c8SDamien Le Moal } 23743b1a94c8SDamien Le Moal 23753b1a94c8SDamien Le Moal /* 23763b1a94c8SDamien Le Moal * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, 23773b1a94c8SDamien Le Moal * starting from chunk_block. 23783b1a94c8SDamien Le Moal */ 23793b1a94c8SDamien Le Moal int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 23803b1a94c8SDamien Le Moal struct dm_zone *to_zone, sector_t chunk_block) 23813b1a94c8SDamien Le Moal { 23823b1a94c8SDamien Le Moal unsigned int nr_blocks; 23833b1a94c8SDamien Le Moal int ret; 23843b1a94c8SDamien Le Moal 23853b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 238636820560SHannes Reinecke while (chunk_block < zmd->zone_nr_blocks) { 23873b1a94c8SDamien Le Moal /* Get a valid region from the source zone */ 23883b1a94c8SDamien Le Moal ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); 23893b1a94c8SDamien Le Moal if (ret <= 0) 23903b1a94c8SDamien Le Moal return ret; 23913b1a94c8SDamien Le Moal 23923b1a94c8SDamien Le Moal nr_blocks = ret; 23933b1a94c8SDamien Le Moal ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); 23943b1a94c8SDamien Le Moal if (ret) 23953b1a94c8SDamien Le Moal return ret; 23963b1a94c8SDamien Le Moal 23973b1a94c8SDamien Le Moal chunk_block += nr_blocks; 23983b1a94c8SDamien Le Moal } 23993b1a94c8SDamien Le Moal 24003b1a94c8SDamien Le Moal return 0; 24013b1a94c8SDamien Le Moal } 24023b1a94c8SDamien Le Moal 24033b1a94c8SDamien Le Moal /* 24043b1a94c8SDamien Le Moal * Validate all the blocks in the range [block..block+nr_blocks-1]. 24053b1a94c8SDamien Le Moal */ 24063b1a94c8SDamien Le Moal int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 24073b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 24083b1a94c8SDamien Le Moal { 24093b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 241036820560SHannes Reinecke unsigned int zone_nr_blocks = zmd->zone_nr_blocks; 24113b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 24123b1a94c8SDamien Le Moal unsigned int n = 0; 24133b1a94c8SDamien Le Moal 2414ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "=> VALIDATE zone %u, block %llu, %u blocks", 2415b7122873SHannes Reinecke zone->id, (unsigned long long)chunk_block, 24163b1a94c8SDamien Le Moal nr_blocks); 24173b1a94c8SDamien Le Moal 24183b1a94c8SDamien Le Moal WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); 24193b1a94c8SDamien Le Moal 24203b1a94c8SDamien Le Moal while (nr_blocks) { 24213b1a94c8SDamien Le Moal /* Get bitmap block */ 24223b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 24233b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 24243b1a94c8SDamien Le Moal return PTR_ERR(mblk); 24253b1a94c8SDamien Le Moal 24263b1a94c8SDamien Le Moal /* Set bits */ 24273b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2428b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 24293b1a94c8SDamien Le Moal 24303b1a94c8SDamien Le Moal count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); 24313b1a94c8SDamien Le Moal if (count) { 24323b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 24333b1a94c8SDamien Le Moal n += count; 24343b1a94c8SDamien Le Moal } 24353b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 24363b1a94c8SDamien Le Moal 24373b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 24383b1a94c8SDamien Le Moal chunk_block += nr_bits; 24393b1a94c8SDamien Le Moal } 24403b1a94c8SDamien Le Moal 24413b1a94c8SDamien Le Moal if (likely(zone->weight + n <= zone_nr_blocks)) 24423b1a94c8SDamien Le Moal zone->weight += n; 24433b1a94c8SDamien Le Moal else { 2444ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u: weight %u should be <= %u", 2445b7122873SHannes Reinecke zone->id, zone->weight, 24463b1a94c8SDamien Le Moal zone_nr_blocks - n); 24473b1a94c8SDamien Le Moal zone->weight = zone_nr_blocks; 24483b1a94c8SDamien Le Moal } 24493b1a94c8SDamien Le Moal 24503b1a94c8SDamien Le Moal return 0; 24513b1a94c8SDamien Le Moal } 24523b1a94c8SDamien Le Moal 24533b1a94c8SDamien Le Moal /* 24543b1a94c8SDamien Le Moal * Clear nr_bits bits in bitmap starting from bit. 24553b1a94c8SDamien Le Moal * Return the number of bits cleared. 24563b1a94c8SDamien Le Moal */ 24573b1a94c8SDamien Le Moal static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) 24583b1a94c8SDamien Le Moal { 24593b1a94c8SDamien Le Moal unsigned long *addr; 24603b1a94c8SDamien Le Moal int end = bit + nr_bits; 24613b1a94c8SDamien Le Moal int n = 0; 24623b1a94c8SDamien Le Moal 24633b1a94c8SDamien Le Moal while (bit < end) { 24643b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 24653b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 24663b1a94c8SDamien Le Moal /* Try to clear whole word at once */ 24673b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 24683b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 24693b1a94c8SDamien Le Moal *addr = 0; 24703b1a94c8SDamien Le Moal n += BITS_PER_LONG; 24713b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 24723b1a94c8SDamien Le Moal continue; 24733b1a94c8SDamien Le Moal } 24743b1a94c8SDamien Le Moal } 24753b1a94c8SDamien Le Moal 24763b1a94c8SDamien Le Moal if (test_and_clear_bit(bit, bitmap)) 24773b1a94c8SDamien Le Moal n++; 24783b1a94c8SDamien Le Moal bit++; 24793b1a94c8SDamien Le Moal } 24803b1a94c8SDamien Le Moal 24813b1a94c8SDamien Le Moal return n; 24823b1a94c8SDamien Le Moal } 24833b1a94c8SDamien Le Moal 24843b1a94c8SDamien Le Moal /* 24853b1a94c8SDamien Le Moal * Invalidate all the blocks in the range [block..block+nr_blocks-1]. 24863b1a94c8SDamien Le Moal */ 24873b1a94c8SDamien Le Moal int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 24883b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 24893b1a94c8SDamien Le Moal { 24903b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 24913b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 24923b1a94c8SDamien Le Moal unsigned int n = 0; 24933b1a94c8SDamien Le Moal 2494ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "=> INVALIDATE zone %u, block %llu, %u blocks", 2495b7122873SHannes Reinecke zone->id, (u64)chunk_block, nr_blocks); 24963b1a94c8SDamien Le Moal 249736820560SHannes Reinecke WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); 24983b1a94c8SDamien Le Moal 24993b1a94c8SDamien Le Moal while (nr_blocks) { 25003b1a94c8SDamien Le Moal /* Get bitmap block */ 25013b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 25023b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 25033b1a94c8SDamien Le Moal return PTR_ERR(mblk); 25043b1a94c8SDamien Le Moal 25053b1a94c8SDamien Le Moal /* Clear bits */ 25063b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2507b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 25083b1a94c8SDamien Le Moal 25093b1a94c8SDamien Le Moal count = dmz_clear_bits((unsigned long *)mblk->data, 25103b1a94c8SDamien Le Moal bit, nr_bits); 25113b1a94c8SDamien Le Moal if (count) { 25123b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 25133b1a94c8SDamien Le Moal n += count; 25143b1a94c8SDamien Le Moal } 25153b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 25163b1a94c8SDamien Le Moal 25173b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 25183b1a94c8SDamien Le Moal chunk_block += nr_bits; 25193b1a94c8SDamien Le Moal } 25203b1a94c8SDamien Le Moal 25213b1a94c8SDamien Le Moal if (zone->weight >= n) 25223b1a94c8SDamien Le Moal zone->weight -= n; 25233b1a94c8SDamien Le Moal else { 2524ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u: weight %u should be >= %u", 2525b7122873SHannes Reinecke zone->id, zone->weight, n); 25263b1a94c8SDamien Le Moal zone->weight = 0; 25273b1a94c8SDamien Le Moal } 25283b1a94c8SDamien Le Moal 25293b1a94c8SDamien Le Moal return 0; 25303b1a94c8SDamien Le Moal } 25313b1a94c8SDamien Le Moal 25323b1a94c8SDamien Le Moal /* 25333b1a94c8SDamien Le Moal * Get a block bit value. 25343b1a94c8SDamien Le Moal */ 25353b1a94c8SDamien Le Moal static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, 25363b1a94c8SDamien Le Moal sector_t chunk_block) 25373b1a94c8SDamien Le Moal { 25383b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 25393b1a94c8SDamien Le Moal int ret; 25403b1a94c8SDamien Le Moal 254136820560SHannes Reinecke WARN_ON(chunk_block >= zmd->zone_nr_blocks); 25423b1a94c8SDamien Le Moal 25433b1a94c8SDamien Le Moal /* Get bitmap block */ 25443b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 25453b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 25463b1a94c8SDamien Le Moal return PTR_ERR(mblk); 25473b1a94c8SDamien Le Moal 25483b1a94c8SDamien Le Moal /* Get offset */ 25493b1a94c8SDamien Le Moal ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, 25503b1a94c8SDamien Le Moal (unsigned long *) mblk->data) != 0; 25513b1a94c8SDamien Le Moal 25523b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 25533b1a94c8SDamien Le Moal 25543b1a94c8SDamien Le Moal return ret; 25553b1a94c8SDamien Le Moal } 25563b1a94c8SDamien Le Moal 25573b1a94c8SDamien Le Moal /* 25583b1a94c8SDamien Le Moal * Return the number of blocks from chunk_block to the first block with a bit 25593b1a94c8SDamien Le Moal * value specified by set. Search at most nr_blocks blocks from chunk_block. 25603b1a94c8SDamien Le Moal */ 25613b1a94c8SDamien Le Moal static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, 25623b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks, 25633b1a94c8SDamien Le Moal int set) 25643b1a94c8SDamien Le Moal { 25653b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 25663b1a94c8SDamien Le Moal unsigned int bit, set_bit, nr_bits; 2567b3996295SDmitry Fomichev unsigned int zone_bits = zmd->zone_bits_per_mblk; 25683b1a94c8SDamien Le Moal unsigned long *bitmap; 25693b1a94c8SDamien Le Moal int n = 0; 25703b1a94c8SDamien Le Moal 257136820560SHannes Reinecke WARN_ON(chunk_block + nr_blocks > zmd->zone_nr_blocks); 25723b1a94c8SDamien Le Moal 25733b1a94c8SDamien Le Moal while (nr_blocks) { 25743b1a94c8SDamien Le Moal /* Get bitmap block */ 25753b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 25763b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 25773b1a94c8SDamien Le Moal return PTR_ERR(mblk); 25783b1a94c8SDamien Le Moal 25793b1a94c8SDamien Le Moal /* Get offset */ 25803b1a94c8SDamien Le Moal bitmap = (unsigned long *) mblk->data; 25813b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2582b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zone_bits - bit); 25833b1a94c8SDamien Le Moal if (set) 2584b3996295SDmitry Fomichev set_bit = find_next_bit(bitmap, zone_bits, bit); 25853b1a94c8SDamien Le Moal else 2586b3996295SDmitry Fomichev set_bit = find_next_zero_bit(bitmap, zone_bits, bit); 25873b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 25883b1a94c8SDamien Le Moal 25893b1a94c8SDamien Le Moal n += set_bit - bit; 2590b3996295SDmitry Fomichev if (set_bit < zone_bits) 25913b1a94c8SDamien Le Moal break; 25923b1a94c8SDamien Le Moal 25933b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 25943b1a94c8SDamien Le Moal chunk_block += nr_bits; 25953b1a94c8SDamien Le Moal } 25963b1a94c8SDamien Le Moal 25973b1a94c8SDamien Le Moal return n; 25983b1a94c8SDamien Le Moal } 25993b1a94c8SDamien Le Moal 26003b1a94c8SDamien Le Moal /* 26013b1a94c8SDamien Le Moal * Test if chunk_block is valid. If it is, the number of consecutive 26023b1a94c8SDamien Le Moal * valid blocks from chunk_block will be returned. 26033b1a94c8SDamien Le Moal */ 26043b1a94c8SDamien Le Moal int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, 26053b1a94c8SDamien Le Moal sector_t chunk_block) 26063b1a94c8SDamien Le Moal { 26073b1a94c8SDamien Le Moal int valid; 26083b1a94c8SDamien Le Moal 26093b1a94c8SDamien Le Moal valid = dmz_test_block(zmd, zone, chunk_block); 26103b1a94c8SDamien Le Moal if (valid <= 0) 26113b1a94c8SDamien Le Moal return valid; 26123b1a94c8SDamien Le Moal 26133b1a94c8SDamien Le Moal /* The block is valid: get the number of valid blocks from block */ 26143b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, chunk_block, 261536820560SHannes Reinecke zmd->zone_nr_blocks - chunk_block, 0); 26163b1a94c8SDamien Le Moal } 26173b1a94c8SDamien Le Moal 26183b1a94c8SDamien Le Moal /* 26193b1a94c8SDamien Le Moal * Find the first valid block from @chunk_block in @zone. 26203b1a94c8SDamien Le Moal * If such a block is found, its number is returned using 26213b1a94c8SDamien Le Moal * @chunk_block and the total number of valid blocks from @chunk_block 26223b1a94c8SDamien Le Moal * is returned. 26233b1a94c8SDamien Le Moal */ 26243b1a94c8SDamien Le Moal int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, 26253b1a94c8SDamien Le Moal sector_t *chunk_block) 26263b1a94c8SDamien Le Moal { 26273b1a94c8SDamien Le Moal sector_t start_block = *chunk_block; 26283b1a94c8SDamien Le Moal int ret; 26293b1a94c8SDamien Le Moal 26303b1a94c8SDamien Le Moal ret = dmz_to_next_set_block(zmd, zone, start_block, 263136820560SHannes Reinecke zmd->zone_nr_blocks - start_block, 1); 26323b1a94c8SDamien Le Moal if (ret < 0) 26333b1a94c8SDamien Le Moal return ret; 26343b1a94c8SDamien Le Moal 26353b1a94c8SDamien Le Moal start_block += ret; 26363b1a94c8SDamien Le Moal *chunk_block = start_block; 26373b1a94c8SDamien Le Moal 26383b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, start_block, 263936820560SHannes Reinecke zmd->zone_nr_blocks - start_block, 0); 26403b1a94c8SDamien Le Moal } 26413b1a94c8SDamien Le Moal 26423b1a94c8SDamien Le Moal /* 26433b1a94c8SDamien Le Moal * Count the number of bits set starting from bit up to bit + nr_bits - 1. 26443b1a94c8SDamien Le Moal */ 26453b1a94c8SDamien Le Moal static int dmz_count_bits(void *bitmap, int bit, int nr_bits) 26463b1a94c8SDamien Le Moal { 26473b1a94c8SDamien Le Moal unsigned long *addr; 26483b1a94c8SDamien Le Moal int end = bit + nr_bits; 26493b1a94c8SDamien Le Moal int n = 0; 26503b1a94c8SDamien Le Moal 26513b1a94c8SDamien Le Moal while (bit < end) { 26523b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 26533b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 26543b1a94c8SDamien Le Moal addr = (unsigned long *)bitmap + BIT_WORD(bit); 26553b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 26563b1a94c8SDamien Le Moal n += BITS_PER_LONG; 26573b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 26583b1a94c8SDamien Le Moal continue; 26593b1a94c8SDamien Le Moal } 26603b1a94c8SDamien Le Moal } 26613b1a94c8SDamien Le Moal 26623b1a94c8SDamien Le Moal if (test_bit(bit, bitmap)) 26633b1a94c8SDamien Le Moal n++; 26643b1a94c8SDamien Le Moal bit++; 26653b1a94c8SDamien Le Moal } 26663b1a94c8SDamien Le Moal 26673b1a94c8SDamien Le Moal return n; 26683b1a94c8SDamien Le Moal } 26693b1a94c8SDamien Le Moal 26703b1a94c8SDamien Le Moal /* 26713b1a94c8SDamien Le Moal * Get a zone weight. 26723b1a94c8SDamien Le Moal */ 26733b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) 26743b1a94c8SDamien Le Moal { 26753b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 26763b1a94c8SDamien Le Moal sector_t chunk_block = 0; 26773b1a94c8SDamien Le Moal unsigned int bit, nr_bits; 267836820560SHannes Reinecke unsigned int nr_blocks = zmd->zone_nr_blocks; 26793b1a94c8SDamien Le Moal void *bitmap; 26803b1a94c8SDamien Le Moal int n = 0; 26813b1a94c8SDamien Le Moal 26823b1a94c8SDamien Le Moal while (nr_blocks) { 26833b1a94c8SDamien Le Moal /* Get bitmap block */ 26843b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 26853b1a94c8SDamien Le Moal if (IS_ERR(mblk)) { 26863b1a94c8SDamien Le Moal n = 0; 26873b1a94c8SDamien Le Moal break; 26883b1a94c8SDamien Le Moal } 26893b1a94c8SDamien Le Moal 26903b1a94c8SDamien Le Moal /* Count bits in this block */ 26913b1a94c8SDamien Le Moal bitmap = mblk->data; 26923b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 2693b3996295SDmitry Fomichev nr_bits = min(nr_blocks, zmd->zone_bits_per_mblk - bit); 26943b1a94c8SDamien Le Moal n += dmz_count_bits(bitmap, bit, nr_bits); 26953b1a94c8SDamien Le Moal 26963b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 26973b1a94c8SDamien Le Moal 26983b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 26993b1a94c8SDamien Le Moal chunk_block += nr_bits; 27003b1a94c8SDamien Le Moal } 27013b1a94c8SDamien Le Moal 27023b1a94c8SDamien Le Moal zone->weight = n; 27033b1a94c8SDamien Le Moal } 27043b1a94c8SDamien Le Moal 27053b1a94c8SDamien Le Moal /* 27063b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 27073b1a94c8SDamien Le Moal */ 27083b1a94c8SDamien Le Moal static void dmz_cleanup_metadata(struct dmz_metadata *zmd) 27093b1a94c8SDamien Le Moal { 27103b1a94c8SDamien Le Moal struct rb_root *root; 27113b1a94c8SDamien Le Moal struct dmz_mblock *mblk, *next; 27123b1a94c8SDamien Le Moal int i; 27133b1a94c8SDamien Le Moal 27143b1a94c8SDamien Le Moal /* Release zone mapping resources */ 27153b1a94c8SDamien Le Moal if (zmd->map_mblk) { 27163b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_map_blocks; i++) 27173b1a94c8SDamien Le Moal dmz_release_mblock(zmd, zmd->map_mblk[i]); 27183b1a94c8SDamien Le Moal kfree(zmd->map_mblk); 27193b1a94c8SDamien Le Moal zmd->map_mblk = NULL; 27203b1a94c8SDamien Le Moal } 27213b1a94c8SDamien Le Moal 27223b1a94c8SDamien Le Moal /* Release super blocks */ 27233b1a94c8SDamien Le Moal for (i = 0; i < 2; i++) { 27243b1a94c8SDamien Le Moal if (zmd->sb[i].mblk) { 27253b1a94c8SDamien Le Moal dmz_free_mblock(zmd, zmd->sb[i].mblk); 27263b1a94c8SDamien Le Moal zmd->sb[i].mblk = NULL; 27273b1a94c8SDamien Le Moal } 27283b1a94c8SDamien Le Moal } 27293b1a94c8SDamien Le Moal 27303b1a94c8SDamien Le Moal /* Free cached blocks */ 27313b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_dirty_list)) { 27323b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_dirty_list, 27333b1a94c8SDamien Le Moal struct dmz_mblock, link); 2734ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "mblock %llu still in dirty list (ref %u)", 273533c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 27363b1a94c8SDamien Le Moal list_del_init(&mblk->link); 27373b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 27383b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 27393b1a94c8SDamien Le Moal } 27403b1a94c8SDamien Le Moal 27413b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list)) { 27423b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 27433b1a94c8SDamien Le Moal struct dmz_mblock, link); 27443b1a94c8SDamien Le Moal list_del_init(&mblk->link); 27453b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 27463b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 27473b1a94c8SDamien Le Moal } 27483b1a94c8SDamien Le Moal 27493b1a94c8SDamien Le Moal /* Sanity checks: the mblock rbtree should now be empty */ 27503b1a94c8SDamien Le Moal root = &zmd->mblk_rbtree; 27513b1a94c8SDamien Le Moal rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { 2752ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "mblock %llu ref %u still in rbtree", 275333c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 275433c2865fSDamien Le Moal mblk->ref = 0; 27553b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 27563b1a94c8SDamien Le Moal } 27573b1a94c8SDamien Le Moal 27583b1a94c8SDamien Le Moal /* Free the zone descriptors */ 27593b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 2760d5ffebddSMike Snitzer 2761d5ffebddSMike Snitzer mutex_destroy(&zmd->mblk_flush_lock); 2762d5ffebddSMike Snitzer mutex_destroy(&zmd->map_lock); 27633b1a94c8SDamien Le Moal } 27643b1a94c8SDamien Le Moal 2765ca1a7045SHannes Reinecke static void dmz_print_dev(struct dmz_metadata *zmd, int num) 2766ca1a7045SHannes Reinecke { 2767ca1a7045SHannes Reinecke struct dmz_dev *dev = &zmd->dev[num]; 2768ca1a7045SHannes Reinecke 2769bd5c4031SHannes Reinecke if (bdev_zoned_model(dev->bdev) == BLK_ZONED_NONE) 2770bd5c4031SHannes Reinecke dmz_dev_info(dev, "Regular block device"); 2771bd5c4031SHannes Reinecke else 2772ca1a7045SHannes Reinecke dmz_dev_info(dev, "Host-%s zoned block device", 2773ca1a7045SHannes Reinecke bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? 2774ca1a7045SHannes Reinecke "aware" : "managed"); 2775bd5c4031SHannes Reinecke if (zmd->sb_version > 1) { 2776bd5c4031SHannes Reinecke sector_t sector_offset = 2777bd5c4031SHannes Reinecke dev->zone_offset << zmd->zone_nr_sectors_shift; 2778bd5c4031SHannes Reinecke 2779bd5c4031SHannes Reinecke dmz_dev_info(dev, " %llu 512-byte logical sectors (offset %llu)", 2780bd5c4031SHannes Reinecke (u64)dev->capacity, (u64)sector_offset); 2781bd5c4031SHannes Reinecke dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors (offset %llu)", 2782bd5c4031SHannes Reinecke dev->nr_zones, (u64)zmd->zone_nr_sectors, 2783bd5c4031SHannes Reinecke (u64)dev->zone_offset); 2784bd5c4031SHannes Reinecke } else { 2785ca1a7045SHannes Reinecke dmz_dev_info(dev, " %llu 512-byte logical sectors", 2786ca1a7045SHannes Reinecke (u64)dev->capacity); 2787ca1a7045SHannes Reinecke dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", 2788ca1a7045SHannes Reinecke dev->nr_zones, (u64)zmd->zone_nr_sectors); 2789ca1a7045SHannes Reinecke } 2790bd5c4031SHannes Reinecke } 2791ca1a7045SHannes Reinecke 27923b1a94c8SDamien Le Moal /* 27933b1a94c8SDamien Le Moal * Initialize the zoned metadata. 27943b1a94c8SDamien Le Moal */ 2795bd5c4031SHannes Reinecke int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev, 2796bd5c4031SHannes Reinecke struct dmz_metadata **metadata, 27972234e732SHannes Reinecke const char *devname) 27983b1a94c8SDamien Le Moal { 27993b1a94c8SDamien Le Moal struct dmz_metadata *zmd; 2800b7122873SHannes Reinecke unsigned int i; 28013b1a94c8SDamien Le Moal struct dm_zone *zone; 28023b1a94c8SDamien Le Moal int ret; 28033b1a94c8SDamien Le Moal 28043b1a94c8SDamien Le Moal zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); 28053b1a94c8SDamien Le Moal if (!zmd) 28063b1a94c8SDamien Le Moal return -ENOMEM; 28073b1a94c8SDamien Le Moal 28082234e732SHannes Reinecke strcpy(zmd->devname, devname); 28093b1a94c8SDamien Le Moal zmd->dev = dev; 2810bd5c4031SHannes Reinecke zmd->nr_devs = num_dev; 28113b1a94c8SDamien Le Moal zmd->mblk_rbtree = RB_ROOT; 28123b1a94c8SDamien Le Moal init_rwsem(&zmd->mblk_sem); 28133b1a94c8SDamien Le Moal mutex_init(&zmd->mblk_flush_lock); 28143b1a94c8SDamien Le Moal spin_lock_init(&zmd->mblk_lock); 28153b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_lru_list); 28163b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_dirty_list); 28173b1a94c8SDamien Le Moal 28183b1a94c8SDamien Le Moal mutex_init(&zmd->map_lock); 28193b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_rnd, 0); 28203b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_rnd_list); 28213b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_rnd_list); 28223b1a94c8SDamien Le Moal 282334f5affdSHannes Reinecke atomic_set(&zmd->unmap_nr_cache, 0); 282434f5affdSHannes Reinecke INIT_LIST_HEAD(&zmd->unmap_cache_list); 282534f5affdSHannes Reinecke INIT_LIST_HEAD(&zmd->map_cache_list); 282634f5affdSHannes Reinecke 28273b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_seq, 0); 28283b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_seq_list); 28293b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_seq_list); 28303b1a94c8SDamien Le Moal 28313b1a94c8SDamien Le Moal atomic_set(&zmd->nr_reserved_seq_zones, 0); 28323b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); 28333b1a94c8SDamien Le Moal 28343b1a94c8SDamien Le Moal init_waitqueue_head(&zmd->free_wq); 28353b1a94c8SDamien Le Moal 28363b1a94c8SDamien Le Moal /* Initialize zone descriptors */ 28373b1a94c8SDamien Le Moal ret = dmz_init_zones(zmd); 28383b1a94c8SDamien Le Moal if (ret) 28393b1a94c8SDamien Le Moal goto err; 28403b1a94c8SDamien Le Moal 28413b1a94c8SDamien Le Moal /* Get super block */ 28423b1a94c8SDamien Le Moal ret = dmz_load_sb(zmd); 28433b1a94c8SDamien Le Moal if (ret) 28443b1a94c8SDamien Le Moal goto err; 28453b1a94c8SDamien Le Moal 28463b1a94c8SDamien Le Moal /* Set metadata zones starting from sb_zone */ 28473b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_meta_zones << 1; i++) { 2848735bd7e4SHannes Reinecke zone = dmz_get(zmd, zmd->sb[0].zone->id + i); 2849a92fbc44SHannes Reinecke if (!zone) { 2850a92fbc44SHannes Reinecke dmz_zmd_err(zmd, 2851a92fbc44SHannes Reinecke "metadata zone %u not present", i); 2852a92fbc44SHannes Reinecke ret = -ENXIO; 2853a92fbc44SHannes Reinecke goto err; 2854a92fbc44SHannes Reinecke } 285534f5affdSHannes Reinecke if (!dmz_is_rnd(zone) && !dmz_is_cache(zone)) { 2856bd5c4031SHannes Reinecke dmz_zmd_err(zmd, 2857bd5c4031SHannes Reinecke "metadata zone %d is not random", i); 2858bd5c4031SHannes Reinecke ret = -ENXIO; 28593b1a94c8SDamien Le Moal goto err; 2860bd5c4031SHannes Reinecke } 28613b1a94c8SDamien Le Moal set_bit(DMZ_META, &zone->flags); 28623b1a94c8SDamien Le Moal } 2863bd5c4031SHannes Reinecke if (zmd->sb[2].zone) { 2864bd5c4031SHannes Reinecke zone = dmz_get(zmd, zmd->sb[2].zone->id); 2865bd5c4031SHannes Reinecke if (!zone) { 2866bd5c4031SHannes Reinecke dmz_zmd_err(zmd, 2867bd5c4031SHannes Reinecke "Tertiary metadata zone not present"); 2868bd5c4031SHannes Reinecke ret = -ENXIO; 2869bd5c4031SHannes Reinecke goto err; 2870bd5c4031SHannes Reinecke } 2871bd5c4031SHannes Reinecke set_bit(DMZ_META, &zone->flags); 2872bd5c4031SHannes Reinecke } 28733b1a94c8SDamien Le Moal /* Load mapping table */ 28743b1a94c8SDamien Le Moal ret = dmz_load_mapping(zmd); 28753b1a94c8SDamien Le Moal if (ret) 28763b1a94c8SDamien Le Moal goto err; 28773b1a94c8SDamien Le Moal 28783b1a94c8SDamien Le Moal /* 28793b1a94c8SDamien Le Moal * Cache size boundaries: allow at least 2 super blocks, the chunk map 28803b1a94c8SDamien Le Moal * blocks and enough blocks to be able to cache the bitmap blocks of 28813b1a94c8SDamien Le Moal * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow 28823b1a94c8SDamien Le Moal * the cache to add 512 more metadata blocks. 28833b1a94c8SDamien Le Moal */ 28843b1a94c8SDamien Le Moal zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; 28853b1a94c8SDamien Le Moal zmd->max_nr_mblks = zmd->min_nr_mblks + 512; 28863b1a94c8SDamien Le Moal zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; 28873b1a94c8SDamien Le Moal zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; 28883b1a94c8SDamien Le Moal zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; 28893b1a94c8SDamien Le Moal 28903b1a94c8SDamien Le Moal /* Metadata cache shrinker */ 28913b1a94c8SDamien Le Moal ret = register_shrinker(&zmd->mblk_shrinker); 28923b1a94c8SDamien Le Moal if (ret) { 2893ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Register metadata cache shrinker failed"); 28943b1a94c8SDamien Le Moal goto err; 28953b1a94c8SDamien Le Moal } 28963b1a94c8SDamien Le Moal 2897bd5c4031SHannes Reinecke dmz_zmd_info(zmd, "DM-Zoned metadata version %d", zmd->sb_version); 2898bd5c4031SHannes Reinecke for (i = 0; i < zmd->nr_devs; i++) 2899bd5c4031SHannes Reinecke dmz_print_dev(zmd, i); 29003b1a94c8SDamien Le Moal 2901ca1a7045SHannes Reinecke dmz_zmd_info(zmd, " %u zones of %llu 512-byte logical sectors", 2902ca1a7045SHannes Reinecke zmd->nr_zones, (u64)zmd->zone_nr_sectors); 2903ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u metadata zones", 2904ca1a7045SHannes Reinecke zmd->nr_meta_zones * 2); 2905ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u data zones for %u chunks", 2906ca1a7045SHannes Reinecke zmd->nr_data_zones, zmd->nr_chunks); 290734f5affdSHannes Reinecke dmz_zmd_debug(zmd, " %u cache zones (%u unmapped)", 290834f5affdSHannes Reinecke zmd->nr_cache, atomic_read(&zmd->unmap_nr_cache)); 2909ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u random zones (%u unmapped)", 2910ca1a7045SHannes Reinecke zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); 2911ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u sequential zones (%u unmapped)", 2912ca1a7045SHannes Reinecke zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); 2913ae3c1f11SHannes Reinecke dmz_zmd_debug(zmd, " %u reserved sequential data zones", 2914ca1a7045SHannes Reinecke zmd->nr_reserved_seq); 2915ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "Format:"); 2916ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, "%u metadata blocks per set (%u max cache)", 29173b1a94c8SDamien Le Moal zmd->nr_meta_blocks, zmd->max_nr_mblks); 2918ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, " %u data zone mapping blocks", 29193b1a94c8SDamien Le Moal zmd->nr_map_blocks); 2920ca1a7045SHannes Reinecke dmz_zmd_debug(zmd, " %u bitmap blocks", 29213b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks); 29223b1a94c8SDamien Le Moal 29233b1a94c8SDamien Le Moal *metadata = zmd; 29243b1a94c8SDamien Le Moal 29253b1a94c8SDamien Le Moal return 0; 29263b1a94c8SDamien Le Moal err: 29273b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 29283b1a94c8SDamien Le Moal kfree(zmd); 29293b1a94c8SDamien Le Moal *metadata = NULL; 29303b1a94c8SDamien Le Moal 29313b1a94c8SDamien Le Moal return ret; 29323b1a94c8SDamien Le Moal } 29333b1a94c8SDamien Le Moal 29343b1a94c8SDamien Le Moal /* 29353b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 29363b1a94c8SDamien Le Moal */ 29373b1a94c8SDamien Le Moal void dmz_dtr_metadata(struct dmz_metadata *zmd) 29383b1a94c8SDamien Le Moal { 29393b1a94c8SDamien Le Moal unregister_shrinker(&zmd->mblk_shrinker); 29403b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 29413b1a94c8SDamien Le Moal kfree(zmd); 29423b1a94c8SDamien Le Moal } 29433b1a94c8SDamien Le Moal 29443b1a94c8SDamien Le Moal /* 29453b1a94c8SDamien Le Moal * Check zone information on resume. 29463b1a94c8SDamien Le Moal */ 29473b1a94c8SDamien Le Moal int dmz_resume_metadata(struct dmz_metadata *zmd) 29483b1a94c8SDamien Le Moal { 29493b1a94c8SDamien Le Moal struct dm_zone *zone; 29503b1a94c8SDamien Le Moal sector_t wp_block; 29513b1a94c8SDamien Le Moal unsigned int i; 29523b1a94c8SDamien Le Moal int ret; 29533b1a94c8SDamien Le Moal 29543b1a94c8SDamien Le Moal /* Check zones */ 295536820560SHannes Reinecke for (i = 0; i < zmd->nr_zones; i++) { 29563b1a94c8SDamien Le Moal zone = dmz_get(zmd, i); 29573b1a94c8SDamien Le Moal if (!zone) { 2958ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Unable to get zone %u", i); 29593b1a94c8SDamien Le Moal return -EIO; 29603b1a94c8SDamien Le Moal } 29613b1a94c8SDamien Le Moal wp_block = zone->wp_block; 29623b1a94c8SDamien Le Moal 29633b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 29643b1a94c8SDamien Le Moal if (ret) { 2965ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Broken zone %u", i); 29663b1a94c8SDamien Le Moal return ret; 29673b1a94c8SDamien Le Moal } 29683b1a94c8SDamien Le Moal 29693b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 2970ca1a7045SHannes Reinecke dmz_zmd_warn(zmd, "Zone %u is offline", i); 29713b1a94c8SDamien Le Moal continue; 29723b1a94c8SDamien Le Moal } 29733b1a94c8SDamien Le Moal 29743b1a94c8SDamien Le Moal /* Check write pointer */ 29753b1a94c8SDamien Le Moal if (!dmz_is_seq(zone)) 29763b1a94c8SDamien Le Moal zone->wp_block = 0; 29773b1a94c8SDamien Le Moal else if (zone->wp_block != wp_block) { 2978ca1a7045SHannes Reinecke dmz_zmd_err(zmd, "Zone %u: Invalid wp (%llu / %llu)", 29793b1a94c8SDamien Le Moal i, (u64)zone->wp_block, (u64)wp_block); 29803b1a94c8SDamien Le Moal zone->wp_block = wp_block; 29813b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 298236820560SHannes Reinecke zmd->zone_nr_blocks - zone->wp_block); 29833b1a94c8SDamien Le Moal } 29843b1a94c8SDamien Le Moal } 29853b1a94c8SDamien Le Moal 29863b1a94c8SDamien Le Moal return 0; 29873b1a94c8SDamien Le Moal } 2988