13b1a94c8SDamien Le Moal /* 23b1a94c8SDamien Le Moal * Copyright (C) 2017 Western Digital Corporation or its affiliates. 33b1a94c8SDamien Le Moal * 43b1a94c8SDamien Le Moal * This file is released under the GPL. 53b1a94c8SDamien Le Moal */ 63b1a94c8SDamien Le Moal 73b1a94c8SDamien Le Moal #include "dm-zoned.h" 83b1a94c8SDamien Le Moal 93b1a94c8SDamien Le Moal #include <linux/module.h> 103b1a94c8SDamien Le Moal #include <linux/crc32.h> 11bd976e52SDamien Le Moal #include <linux/sched/mm.h> 123b1a94c8SDamien Le Moal 133b1a94c8SDamien Le Moal #define DM_MSG_PREFIX "zoned metadata" 143b1a94c8SDamien Le Moal 153b1a94c8SDamien Le Moal /* 163b1a94c8SDamien Le Moal * Metadata version. 173b1a94c8SDamien Le Moal */ 183b1a94c8SDamien Le Moal #define DMZ_META_VER 1 193b1a94c8SDamien Le Moal 203b1a94c8SDamien Le Moal /* 213b1a94c8SDamien Le Moal * On-disk super block magic. 223b1a94c8SDamien Le Moal */ 233b1a94c8SDamien Le Moal #define DMZ_MAGIC ((((unsigned int)('D')) << 24) | \ 243b1a94c8SDamien Le Moal (((unsigned int)('Z')) << 16) | \ 253b1a94c8SDamien Le Moal (((unsigned int)('B')) << 8) | \ 263b1a94c8SDamien Le Moal ((unsigned int)('D'))) 273b1a94c8SDamien Le Moal 283b1a94c8SDamien Le Moal /* 293b1a94c8SDamien Le Moal * On disk super block. 303b1a94c8SDamien Le Moal * This uses only 512 B but uses on disk a full 4KB block. This block is 313b1a94c8SDamien Le Moal * followed on disk by the mapping table of chunks to zones and the bitmap 323b1a94c8SDamien Le Moal * blocks indicating zone block validity. 333b1a94c8SDamien Le Moal * The overall resulting metadata format is: 343b1a94c8SDamien Le Moal * (1) Super block (1 block) 353b1a94c8SDamien Le Moal * (2) Chunk mapping table (nr_map_blocks) 363b1a94c8SDamien Le Moal * (3) Bitmap blocks (nr_bitmap_blocks) 373b1a94c8SDamien Le Moal * All metadata blocks are stored in conventional zones, starting from the 383b1a94c8SDamien Le Moal * the first conventional zone found on disk. 393b1a94c8SDamien Le Moal */ 403b1a94c8SDamien Le Moal struct dmz_super { 413b1a94c8SDamien Le Moal /* Magic number */ 423b1a94c8SDamien Le Moal __le32 magic; /* 4 */ 433b1a94c8SDamien Le Moal 443b1a94c8SDamien Le Moal /* Metadata version number */ 453b1a94c8SDamien Le Moal __le32 version; /* 8 */ 463b1a94c8SDamien Le Moal 473b1a94c8SDamien Le Moal /* Generation number */ 483b1a94c8SDamien Le Moal __le64 gen; /* 16 */ 493b1a94c8SDamien Le Moal 503b1a94c8SDamien Le Moal /* This block number */ 513b1a94c8SDamien Le Moal __le64 sb_block; /* 24 */ 523b1a94c8SDamien Le Moal 533b1a94c8SDamien Le Moal /* The number of metadata blocks, including this super block */ 543b1a94c8SDamien Le Moal __le32 nr_meta_blocks; /* 28 */ 553b1a94c8SDamien Le Moal 563b1a94c8SDamien Le Moal /* The number of sequential zones reserved for reclaim */ 573b1a94c8SDamien Le Moal __le32 nr_reserved_seq; /* 32 */ 583b1a94c8SDamien Le Moal 593b1a94c8SDamien Le Moal /* The number of entries in the mapping table */ 603b1a94c8SDamien Le Moal __le32 nr_chunks; /* 36 */ 613b1a94c8SDamien Le Moal 623b1a94c8SDamien Le Moal /* The number of blocks used for the chunk mapping table */ 633b1a94c8SDamien Le Moal __le32 nr_map_blocks; /* 40 */ 643b1a94c8SDamien Le Moal 653b1a94c8SDamien Le Moal /* The number of blocks used for the block bitmaps */ 663b1a94c8SDamien Le Moal __le32 nr_bitmap_blocks; /* 44 */ 673b1a94c8SDamien Le Moal 683b1a94c8SDamien Le Moal /* Checksum */ 693b1a94c8SDamien Le Moal __le32 crc; /* 48 */ 703b1a94c8SDamien Le Moal 713b1a94c8SDamien Le Moal /* Padding to full 512B sector */ 723b1a94c8SDamien Le Moal u8 reserved[464]; /* 512 */ 733b1a94c8SDamien Le Moal }; 743b1a94c8SDamien Le Moal 753b1a94c8SDamien Le Moal /* 763b1a94c8SDamien Le Moal * Chunk mapping entry: entries are indexed by chunk number 773b1a94c8SDamien Le Moal * and give the zone ID (dzone_id) mapping the chunk on disk. 783b1a94c8SDamien Le Moal * This zone may be sequential or random. If it is a sequential 793b1a94c8SDamien Le Moal * zone, a second zone (bzone_id) used as a write buffer may 803b1a94c8SDamien Le Moal * also be specified. This second zone will always be a randomly 813b1a94c8SDamien Le Moal * writeable zone. 823b1a94c8SDamien Le Moal */ 833b1a94c8SDamien Le Moal struct dmz_map { 843b1a94c8SDamien Le Moal __le32 dzone_id; 853b1a94c8SDamien Le Moal __le32 bzone_id; 863b1a94c8SDamien Le Moal }; 873b1a94c8SDamien Le Moal 883b1a94c8SDamien Le Moal /* 893b1a94c8SDamien Le Moal * Chunk mapping table metadata: 512 8-bytes entries per 4KB block. 903b1a94c8SDamien Le Moal */ 913b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES (DMZ_BLOCK_SIZE / sizeof(struct dmz_map)) 923b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_SHIFT (ilog2(DMZ_MAP_ENTRIES)) 933b1a94c8SDamien Le Moal #define DMZ_MAP_ENTRIES_MASK (DMZ_MAP_ENTRIES - 1) 943b1a94c8SDamien Le Moal #define DMZ_MAP_UNMAPPED UINT_MAX 953b1a94c8SDamien Le Moal 963b1a94c8SDamien Le Moal /* 973b1a94c8SDamien Le Moal * Meta data block descriptor (for cached metadata blocks). 983b1a94c8SDamien Le Moal */ 993b1a94c8SDamien Le Moal struct dmz_mblock { 1003b1a94c8SDamien Le Moal struct rb_node node; 1013b1a94c8SDamien Le Moal struct list_head link; 1023b1a94c8SDamien Le Moal sector_t no; 10333c2865fSDamien Le Moal unsigned int ref; 1043b1a94c8SDamien Le Moal unsigned long state; 1053b1a94c8SDamien Le Moal struct page *page; 1063b1a94c8SDamien Le Moal void *data; 1073b1a94c8SDamien Le Moal }; 1083b1a94c8SDamien Le Moal 1093b1a94c8SDamien Le Moal /* 1103b1a94c8SDamien Le Moal * Metadata block state flags. 1113b1a94c8SDamien Le Moal */ 1123b1a94c8SDamien Le Moal enum { 1133b1a94c8SDamien Le Moal DMZ_META_DIRTY, 1143b1a94c8SDamien Le Moal DMZ_META_READING, 1153b1a94c8SDamien Le Moal DMZ_META_WRITING, 1163b1a94c8SDamien Le Moal DMZ_META_ERROR, 1173b1a94c8SDamien Le Moal }; 1183b1a94c8SDamien Le Moal 1193b1a94c8SDamien Le Moal /* 1203b1a94c8SDamien Le Moal * Super block information (one per metadata set). 1213b1a94c8SDamien Le Moal */ 1223b1a94c8SDamien Le Moal struct dmz_sb { 1233b1a94c8SDamien Le Moal sector_t block; 1243b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 1253b1a94c8SDamien Le Moal struct dmz_super *sb; 1263b1a94c8SDamien Le Moal }; 1273b1a94c8SDamien Le Moal 1283b1a94c8SDamien Le Moal /* 1293b1a94c8SDamien Le Moal * In-memory metadata. 1303b1a94c8SDamien Le Moal */ 1313b1a94c8SDamien Le Moal struct dmz_metadata { 1323b1a94c8SDamien Le Moal struct dmz_dev *dev; 1333b1a94c8SDamien Le Moal 1343b1a94c8SDamien Le Moal sector_t zone_bitmap_size; 1353b1a94c8SDamien Le Moal unsigned int zone_nr_bitmap_blocks; 1363b1a94c8SDamien Le Moal 1373b1a94c8SDamien Le Moal unsigned int nr_bitmap_blocks; 1383b1a94c8SDamien Le Moal unsigned int nr_map_blocks; 1393b1a94c8SDamien Le Moal 1403b1a94c8SDamien Le Moal unsigned int nr_useable_zones; 1413b1a94c8SDamien Le Moal unsigned int nr_meta_blocks; 1423b1a94c8SDamien Le Moal unsigned int nr_meta_zones; 1433b1a94c8SDamien Le Moal unsigned int nr_data_zones; 1443b1a94c8SDamien Le Moal unsigned int nr_rnd_zones; 1453b1a94c8SDamien Le Moal unsigned int nr_reserved_seq; 1463b1a94c8SDamien Le Moal unsigned int nr_chunks; 1473b1a94c8SDamien Le Moal 1483b1a94c8SDamien Le Moal /* Zone information array */ 1493b1a94c8SDamien Le Moal struct dm_zone *zones; 1503b1a94c8SDamien Le Moal 1513b1a94c8SDamien Le Moal struct dm_zone *sb_zone; 1523b1a94c8SDamien Le Moal struct dmz_sb sb[2]; 1533b1a94c8SDamien Le Moal unsigned int mblk_primary; 1543b1a94c8SDamien Le Moal u64 sb_gen; 1553b1a94c8SDamien Le Moal unsigned int min_nr_mblks; 1563b1a94c8SDamien Le Moal unsigned int max_nr_mblks; 1573b1a94c8SDamien Le Moal atomic_t nr_mblks; 1583b1a94c8SDamien Le Moal struct rw_semaphore mblk_sem; 1593b1a94c8SDamien Le Moal struct mutex mblk_flush_lock; 1603b1a94c8SDamien Le Moal spinlock_t mblk_lock; 1613b1a94c8SDamien Le Moal struct rb_root mblk_rbtree; 1623b1a94c8SDamien Le Moal struct list_head mblk_lru_list; 1633b1a94c8SDamien Le Moal struct list_head mblk_dirty_list; 1643b1a94c8SDamien Le Moal struct shrinker mblk_shrinker; 1653b1a94c8SDamien Le Moal 1663b1a94c8SDamien Le Moal /* Zone allocation management */ 1673b1a94c8SDamien Le Moal struct mutex map_lock; 1683b1a94c8SDamien Le Moal struct dmz_mblock **map_mblk; 1693b1a94c8SDamien Le Moal unsigned int nr_rnd; 1703b1a94c8SDamien Le Moal atomic_t unmap_nr_rnd; 1713b1a94c8SDamien Le Moal struct list_head unmap_rnd_list; 1723b1a94c8SDamien Le Moal struct list_head map_rnd_list; 1733b1a94c8SDamien Le Moal 1743b1a94c8SDamien Le Moal unsigned int nr_seq; 1753b1a94c8SDamien Le Moal atomic_t unmap_nr_seq; 1763b1a94c8SDamien Le Moal struct list_head unmap_seq_list; 1773b1a94c8SDamien Le Moal struct list_head map_seq_list; 1783b1a94c8SDamien Le Moal 1793b1a94c8SDamien Le Moal atomic_t nr_reserved_seq_zones; 1803b1a94c8SDamien Le Moal struct list_head reserved_seq_zones_list; 1813b1a94c8SDamien Le Moal 1823b1a94c8SDamien Le Moal wait_queue_head_t free_wq; 1833b1a94c8SDamien Le Moal }; 1843b1a94c8SDamien Le Moal 1853b1a94c8SDamien Le Moal /* 1863b1a94c8SDamien Le Moal * Various accessors 1873b1a94c8SDamien Le Moal */ 1883b1a94c8SDamien Le Moal unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone) 1893b1a94c8SDamien Le Moal { 1903b1a94c8SDamien Le Moal return ((unsigned int)(zone - zmd->zones)); 1913b1a94c8SDamien Le Moal } 1923b1a94c8SDamien Le Moal 1933b1a94c8SDamien Le Moal sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) 1943b1a94c8SDamien Le Moal { 1953908c983SDamien Le Moal return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift; 1963b1a94c8SDamien Le Moal } 1973b1a94c8SDamien Le Moal 1983b1a94c8SDamien Le Moal sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) 1993b1a94c8SDamien Le Moal { 2003908c983SDamien Le Moal return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift; 2013b1a94c8SDamien Le Moal } 2023b1a94c8SDamien Le Moal 2033b1a94c8SDamien Le Moal unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) 2043b1a94c8SDamien Le Moal { 2053b1a94c8SDamien Le Moal return zmd->nr_chunks; 2063b1a94c8SDamien Le Moal } 2073b1a94c8SDamien Le Moal 2083b1a94c8SDamien Le Moal unsigned int dmz_nr_rnd_zones(struct dmz_metadata *zmd) 2093b1a94c8SDamien Le Moal { 2103b1a94c8SDamien Le Moal return zmd->nr_rnd; 2113b1a94c8SDamien Le Moal } 2123b1a94c8SDamien Le Moal 2133b1a94c8SDamien Le Moal unsigned int dmz_nr_unmap_rnd_zones(struct dmz_metadata *zmd) 2143b1a94c8SDamien Le Moal { 2153b1a94c8SDamien Le Moal return atomic_read(&zmd->unmap_nr_rnd); 2163b1a94c8SDamien Le Moal } 2173b1a94c8SDamien Le Moal 2183b1a94c8SDamien Le Moal /* 2193b1a94c8SDamien Le Moal * Lock/unlock mapping table. 2203b1a94c8SDamien Le Moal * The map lock also protects all the zone lists. 2213b1a94c8SDamien Le Moal */ 2223b1a94c8SDamien Le Moal void dmz_lock_map(struct dmz_metadata *zmd) 2233b1a94c8SDamien Le Moal { 2243b1a94c8SDamien Le Moal mutex_lock(&zmd->map_lock); 2253b1a94c8SDamien Le Moal } 2263b1a94c8SDamien Le Moal 2273b1a94c8SDamien Le Moal void dmz_unlock_map(struct dmz_metadata *zmd) 2283b1a94c8SDamien Le Moal { 2293b1a94c8SDamien Le Moal mutex_unlock(&zmd->map_lock); 2303b1a94c8SDamien Le Moal } 2313b1a94c8SDamien Le Moal 2323b1a94c8SDamien Le Moal /* 2333b1a94c8SDamien Le Moal * Lock/unlock metadata access. This is a "read" lock on a semaphore 2343b1a94c8SDamien Le Moal * that prevents metadata flush from running while metadata are being 2353b1a94c8SDamien Le Moal * modified. The actual metadata write mutual exclusion is achieved with 2363b1a94c8SDamien Le Moal * the map lock and zone styate management (active and reclaim state are 2373b1a94c8SDamien Le Moal * mutually exclusive). 2383b1a94c8SDamien Le Moal */ 2393b1a94c8SDamien Le Moal void dmz_lock_metadata(struct dmz_metadata *zmd) 2403b1a94c8SDamien Le Moal { 2413b1a94c8SDamien Le Moal down_read(&zmd->mblk_sem); 2423b1a94c8SDamien Le Moal } 2433b1a94c8SDamien Le Moal 2443b1a94c8SDamien Le Moal void dmz_unlock_metadata(struct dmz_metadata *zmd) 2453b1a94c8SDamien Le Moal { 2463b1a94c8SDamien Le Moal up_read(&zmd->mblk_sem); 2473b1a94c8SDamien Le Moal } 2483b1a94c8SDamien Le Moal 2493b1a94c8SDamien Le Moal /* 2503b1a94c8SDamien Le Moal * Lock/unlock flush: prevent concurrent executions 2513b1a94c8SDamien Le Moal * of dmz_flush_metadata as well as metadata modification in reclaim 2523b1a94c8SDamien Le Moal * while flush is being executed. 2533b1a94c8SDamien Le Moal */ 2543b1a94c8SDamien Le Moal void dmz_lock_flush(struct dmz_metadata *zmd) 2553b1a94c8SDamien Le Moal { 2563b1a94c8SDamien Le Moal mutex_lock(&zmd->mblk_flush_lock); 2573b1a94c8SDamien Le Moal } 2583b1a94c8SDamien Le Moal 2593b1a94c8SDamien Le Moal void dmz_unlock_flush(struct dmz_metadata *zmd) 2603b1a94c8SDamien Le Moal { 2613b1a94c8SDamien Le Moal mutex_unlock(&zmd->mblk_flush_lock); 2623b1a94c8SDamien Le Moal } 2633b1a94c8SDamien Le Moal 2643b1a94c8SDamien Le Moal /* 2653b1a94c8SDamien Le Moal * Allocate a metadata block. 2663b1a94c8SDamien Le Moal */ 2673b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_alloc_mblock(struct dmz_metadata *zmd, 2683b1a94c8SDamien Le Moal sector_t mblk_no) 2693b1a94c8SDamien Le Moal { 2703b1a94c8SDamien Le Moal struct dmz_mblock *mblk = NULL; 2713b1a94c8SDamien Le Moal 2723b1a94c8SDamien Le Moal /* See if we can reuse cached blocks */ 2733b1a94c8SDamien Le Moal if (zmd->max_nr_mblks && atomic_read(&zmd->nr_mblks) > zmd->max_nr_mblks) { 2743b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 2753b1a94c8SDamien Le Moal mblk = list_first_entry_or_null(&zmd->mblk_lru_list, 2763b1a94c8SDamien Le Moal struct dmz_mblock, link); 2773b1a94c8SDamien Le Moal if (mblk) { 2783b1a94c8SDamien Le Moal list_del_init(&mblk->link); 2793b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 2803b1a94c8SDamien Le Moal mblk->no = mblk_no; 2813b1a94c8SDamien Le Moal } 2823b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 2833b1a94c8SDamien Le Moal if (mblk) 2843b1a94c8SDamien Le Moal return mblk; 2853b1a94c8SDamien Le Moal } 2863b1a94c8SDamien Le Moal 2873b1a94c8SDamien Le Moal /* Allocate a new block */ 2883b1a94c8SDamien Le Moal mblk = kmalloc(sizeof(struct dmz_mblock), GFP_NOIO); 2893b1a94c8SDamien Le Moal if (!mblk) 2903b1a94c8SDamien Le Moal return NULL; 2913b1a94c8SDamien Le Moal 2923b1a94c8SDamien Le Moal mblk->page = alloc_page(GFP_NOIO); 2933b1a94c8SDamien Le Moal if (!mblk->page) { 2943b1a94c8SDamien Le Moal kfree(mblk); 2953b1a94c8SDamien Le Moal return NULL; 2963b1a94c8SDamien Le Moal } 2973b1a94c8SDamien Le Moal 2983b1a94c8SDamien Le Moal RB_CLEAR_NODE(&mblk->node); 2993b1a94c8SDamien Le Moal INIT_LIST_HEAD(&mblk->link); 30033c2865fSDamien Le Moal mblk->ref = 0; 3013b1a94c8SDamien Le Moal mblk->state = 0; 3023b1a94c8SDamien Le Moal mblk->no = mblk_no; 3033b1a94c8SDamien Le Moal mblk->data = page_address(mblk->page); 3043b1a94c8SDamien Le Moal 3053b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_mblks); 3063b1a94c8SDamien Le Moal 3073b1a94c8SDamien Le Moal return mblk; 3083b1a94c8SDamien Le Moal } 3093b1a94c8SDamien Le Moal 3103b1a94c8SDamien Le Moal /* 3113b1a94c8SDamien Le Moal * Free a metadata block. 3123b1a94c8SDamien Le Moal */ 3133b1a94c8SDamien Le Moal static void dmz_free_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 3143b1a94c8SDamien Le Moal { 3153b1a94c8SDamien Le Moal __free_pages(mblk->page, 0); 3163b1a94c8SDamien Le Moal kfree(mblk); 3173b1a94c8SDamien Le Moal 3183b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_mblks); 3193b1a94c8SDamien Le Moal } 3203b1a94c8SDamien Le Moal 3213b1a94c8SDamien Le Moal /* 3223b1a94c8SDamien Le Moal * Insert a metadata block in the rbtree. 3233b1a94c8SDamien Le Moal */ 3243b1a94c8SDamien Le Moal static void dmz_insert_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 3253b1a94c8SDamien Le Moal { 3263b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 3273b1a94c8SDamien Le Moal struct rb_node **new = &(root->rb_node), *parent = NULL; 3283b1a94c8SDamien Le Moal struct dmz_mblock *b; 3293b1a94c8SDamien Le Moal 3303b1a94c8SDamien Le Moal /* Figure out where to put the new node */ 3313b1a94c8SDamien Le Moal while (*new) { 3323b1a94c8SDamien Le Moal b = container_of(*new, struct dmz_mblock, node); 3333b1a94c8SDamien Le Moal parent = *new; 3343b1a94c8SDamien Le Moal new = (b->no < mblk->no) ? &((*new)->rb_left) : &((*new)->rb_right); 3353b1a94c8SDamien Le Moal } 3363b1a94c8SDamien Le Moal 3373b1a94c8SDamien Le Moal /* Add new node and rebalance tree */ 3383b1a94c8SDamien Le Moal rb_link_node(&mblk->node, parent, new); 3393b1a94c8SDamien Le Moal rb_insert_color(&mblk->node, root); 3403b1a94c8SDamien Le Moal } 3413b1a94c8SDamien Le Moal 3423b1a94c8SDamien Le Moal /* 3433d4e7383SDamien Le Moal * Lookup a metadata block in the rbtree. If the block is found, increment 3443d4e7383SDamien Le Moal * its reference count. 3453b1a94c8SDamien Le Moal */ 3463d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_fast(struct dmz_metadata *zmd, 3473b1a94c8SDamien Le Moal sector_t mblk_no) 3483b1a94c8SDamien Le Moal { 3493b1a94c8SDamien Le Moal struct rb_root *root = &zmd->mblk_rbtree; 3503b1a94c8SDamien Le Moal struct rb_node *node = root->rb_node; 3513b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 3523b1a94c8SDamien Le Moal 3533b1a94c8SDamien Le Moal while (node) { 3543b1a94c8SDamien Le Moal mblk = container_of(node, struct dmz_mblock, node); 3553d4e7383SDamien Le Moal if (mblk->no == mblk_no) { 3563d4e7383SDamien Le Moal /* 3573d4e7383SDamien Le Moal * If this is the first reference to the block, 3583d4e7383SDamien Le Moal * remove it from the LRU list. 3593d4e7383SDamien Le Moal */ 3603d4e7383SDamien Le Moal mblk->ref++; 3613d4e7383SDamien Le Moal if (mblk->ref == 1 && 3623d4e7383SDamien Le Moal !test_bit(DMZ_META_DIRTY, &mblk->state)) 3633d4e7383SDamien Le Moal list_del_init(&mblk->link); 3643b1a94c8SDamien Le Moal return mblk; 3653d4e7383SDamien Le Moal } 3663b1a94c8SDamien Le Moal node = (mblk->no < mblk_no) ? node->rb_left : node->rb_right; 3673b1a94c8SDamien Le Moal } 3683b1a94c8SDamien Le Moal 3693b1a94c8SDamien Le Moal return NULL; 3703b1a94c8SDamien Le Moal } 3713b1a94c8SDamien Le Moal 3723b1a94c8SDamien Le Moal /* 3733b1a94c8SDamien Le Moal * Metadata block BIO end callback. 3743b1a94c8SDamien Le Moal */ 3753b1a94c8SDamien Le Moal static void dmz_mblock_bio_end_io(struct bio *bio) 3763b1a94c8SDamien Le Moal { 3773b1a94c8SDamien Le Moal struct dmz_mblock *mblk = bio->bi_private; 3783b1a94c8SDamien Le Moal int flag; 3793b1a94c8SDamien Le Moal 3803b1a94c8SDamien Le Moal if (bio->bi_status) 3813b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 3823b1a94c8SDamien Le Moal 3833b1a94c8SDamien Le Moal if (bio_op(bio) == REQ_OP_WRITE) 3843b1a94c8SDamien Le Moal flag = DMZ_META_WRITING; 3853b1a94c8SDamien Le Moal else 3863b1a94c8SDamien Le Moal flag = DMZ_META_READING; 3873b1a94c8SDamien Le Moal 3883b1a94c8SDamien Le Moal clear_bit_unlock(flag, &mblk->state); 3893b1a94c8SDamien Le Moal smp_mb__after_atomic(); 3903b1a94c8SDamien Le Moal wake_up_bit(&mblk->state, flag); 3913b1a94c8SDamien Le Moal 3923b1a94c8SDamien Le Moal bio_put(bio); 3933b1a94c8SDamien Le Moal } 3943b1a94c8SDamien Le Moal 3953b1a94c8SDamien Le Moal /* 3963d4e7383SDamien Le Moal * Read an uncached metadata block from disk and add it to the cache. 3973b1a94c8SDamien Le Moal */ 3983d4e7383SDamien Le Moal static struct dmz_mblock *dmz_get_mblock_slow(struct dmz_metadata *zmd, 3993b1a94c8SDamien Le Moal sector_t mblk_no) 4003b1a94c8SDamien Le Moal { 4013d4e7383SDamien Le Moal struct dmz_mblock *mblk, *m; 4023b1a94c8SDamien Le Moal sector_t block = zmd->sb[zmd->mblk_primary].block + mblk_no; 4033b1a94c8SDamien Le Moal struct bio *bio; 4043b1a94c8SDamien Le Moal 4053d4e7383SDamien Le Moal /* Get a new block and a BIO to read it */ 4063b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, mblk_no); 4073b1a94c8SDamien Le Moal if (!mblk) 4083b1a94c8SDamien Le Moal return NULL; 4093b1a94c8SDamien Le Moal 4103b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 4113b1a94c8SDamien Le Moal if (!bio) { 4123b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 4133b1a94c8SDamien Le Moal return NULL; 4143b1a94c8SDamien Le Moal } 4153b1a94c8SDamien Le Moal 4163d4e7383SDamien Le Moal spin_lock(&zmd->mblk_lock); 4173d4e7383SDamien Le Moal 4183d4e7383SDamien Le Moal /* 4193d4e7383SDamien Le Moal * Make sure that another context did not start reading 4203d4e7383SDamien Le Moal * the block already. 4213d4e7383SDamien Le Moal */ 4223d4e7383SDamien Le Moal m = dmz_get_mblock_fast(zmd, mblk_no); 4233d4e7383SDamien Le Moal if (m) { 4243d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 4253d4e7383SDamien Le Moal dmz_free_mblock(zmd, mblk); 4263d4e7383SDamien Le Moal bio_put(bio); 4273d4e7383SDamien Le Moal return m; 4283d4e7383SDamien Le Moal } 4293d4e7383SDamien Le Moal 4303d4e7383SDamien Le Moal mblk->ref++; 4313d4e7383SDamien Le Moal set_bit(DMZ_META_READING, &mblk->state); 4323d4e7383SDamien Le Moal dmz_insert_mblock(zmd, mblk); 4333d4e7383SDamien Le Moal 4343d4e7383SDamien Le Moal spin_unlock(&zmd->mblk_lock); 4353d4e7383SDamien Le Moal 4363d4e7383SDamien Le Moal /* Submit read BIO */ 4373b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 43874d46992SChristoph Hellwig bio_set_dev(bio, zmd->dev->bdev); 4393b1a94c8SDamien Le Moal bio->bi_private = mblk; 4403b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 4413b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_READ, REQ_META | REQ_PRIO); 4423b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 4433b1a94c8SDamien Le Moal submit_bio(bio); 4443b1a94c8SDamien Le Moal 4453b1a94c8SDamien Le Moal return mblk; 4463b1a94c8SDamien Le Moal } 4473b1a94c8SDamien Le Moal 4483b1a94c8SDamien Le Moal /* 4493b1a94c8SDamien Le Moal * Free metadata blocks. 4503b1a94c8SDamien Le Moal */ 4513b1a94c8SDamien Le Moal static unsigned long dmz_shrink_mblock_cache(struct dmz_metadata *zmd, 4523b1a94c8SDamien Le Moal unsigned long limit) 4533b1a94c8SDamien Le Moal { 4543b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 4553b1a94c8SDamien Le Moal unsigned long count = 0; 4563b1a94c8SDamien Le Moal 4573b1a94c8SDamien Le Moal if (!zmd->max_nr_mblks) 4583b1a94c8SDamien Le Moal return 0; 4593b1a94c8SDamien Le Moal 4603b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list) && 4613b1a94c8SDamien Le Moal atomic_read(&zmd->nr_mblks) > zmd->min_nr_mblks && 4623b1a94c8SDamien Le Moal count < limit) { 4633b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 4643b1a94c8SDamien Le Moal struct dmz_mblock, link); 4653b1a94c8SDamien Le Moal list_del_init(&mblk->link); 4663b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 4673b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 4683b1a94c8SDamien Le Moal count++; 4693b1a94c8SDamien Le Moal } 4703b1a94c8SDamien Le Moal 4713b1a94c8SDamien Le Moal return count; 4723b1a94c8SDamien Le Moal } 4733b1a94c8SDamien Le Moal 4743b1a94c8SDamien Le Moal /* 4753b1a94c8SDamien Le Moal * For mblock shrinker: get the number of unused metadata blocks in the cache. 4763b1a94c8SDamien Le Moal */ 4773b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_count(struct shrinker *shrink, 4783b1a94c8SDamien Le Moal struct shrink_control *sc) 4793b1a94c8SDamien Le Moal { 4803b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 4813b1a94c8SDamien Le Moal 4823b1a94c8SDamien Le Moal return atomic_read(&zmd->nr_mblks); 4833b1a94c8SDamien Le Moal } 4843b1a94c8SDamien Le Moal 4853b1a94c8SDamien Le Moal /* 4863b1a94c8SDamien Le Moal * For mblock shrinker: scan unused metadata blocks and shrink the cache. 4873b1a94c8SDamien Le Moal */ 4883b1a94c8SDamien Le Moal static unsigned long dmz_mblock_shrinker_scan(struct shrinker *shrink, 4893b1a94c8SDamien Le Moal struct shrink_control *sc) 4903b1a94c8SDamien Le Moal { 4913b1a94c8SDamien Le Moal struct dmz_metadata *zmd = container_of(shrink, struct dmz_metadata, mblk_shrinker); 4923b1a94c8SDamien Le Moal unsigned long count; 4933b1a94c8SDamien Le Moal 4943b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 4953b1a94c8SDamien Le Moal count = dmz_shrink_mblock_cache(zmd, sc->nr_to_scan); 4963b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 4973b1a94c8SDamien Le Moal 4983b1a94c8SDamien Le Moal return count ? count : SHRINK_STOP; 4993b1a94c8SDamien Le Moal } 5003b1a94c8SDamien Le Moal 5013b1a94c8SDamien Le Moal /* 5023b1a94c8SDamien Le Moal * Release a metadata block. 5033b1a94c8SDamien Le Moal */ 5043b1a94c8SDamien Le Moal static void dmz_release_mblock(struct dmz_metadata *zmd, 5053b1a94c8SDamien Le Moal struct dmz_mblock *mblk) 5063b1a94c8SDamien Le Moal { 5073b1a94c8SDamien Le Moal 5083b1a94c8SDamien Le Moal if (!mblk) 5093b1a94c8SDamien Le Moal return; 5103b1a94c8SDamien Le Moal 5113b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 5123b1a94c8SDamien Le Moal 51333c2865fSDamien Le Moal mblk->ref--; 51433c2865fSDamien Le Moal if (mblk->ref == 0) { 5153b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 5163b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 5173b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 5183b1a94c8SDamien Le Moal } else if (!test_bit(DMZ_META_DIRTY, &mblk->state)) { 5193b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 5203b1a94c8SDamien Le Moal dmz_shrink_mblock_cache(zmd, 1); 5213b1a94c8SDamien Le Moal } 5223b1a94c8SDamien Le Moal } 5233b1a94c8SDamien Le Moal 5243b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5253b1a94c8SDamien Le Moal } 5263b1a94c8SDamien Le Moal 5273b1a94c8SDamien Le Moal /* 5283b1a94c8SDamien Le Moal * Get a metadata block from the rbtree. If the block 5293b1a94c8SDamien Le Moal * is not present, read it from disk. 5303b1a94c8SDamien Le Moal */ 5313b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_mblock(struct dmz_metadata *zmd, 5323b1a94c8SDamien Le Moal sector_t mblk_no) 5333b1a94c8SDamien Le Moal { 5343b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 5353b1a94c8SDamien Le Moal 5363b1a94c8SDamien Le Moal /* Check rbtree */ 5373b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 5383d4e7383SDamien Le Moal mblk = dmz_get_mblock_fast(zmd, mblk_no); 5393b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5403b1a94c8SDamien Le Moal 5413b1a94c8SDamien Le Moal if (!mblk) { 5423b1a94c8SDamien Le Moal /* Cache miss: read the block from disk */ 5433d4e7383SDamien Le Moal mblk = dmz_get_mblock_slow(zmd, mblk_no); 5443b1a94c8SDamien Le Moal if (!mblk) 5453b1a94c8SDamien Le Moal return ERR_PTR(-ENOMEM); 5463b1a94c8SDamien Le Moal } 5473b1a94c8SDamien Le Moal 5483b1a94c8SDamien Le Moal /* Wait for on-going read I/O and check for error */ 5493b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_READING, 5503b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 5513b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 5523b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 5533b1a94c8SDamien Le Moal return ERR_PTR(-EIO); 5543b1a94c8SDamien Le Moal } 5553b1a94c8SDamien Le Moal 5563b1a94c8SDamien Le Moal return mblk; 5573b1a94c8SDamien Le Moal } 5583b1a94c8SDamien Le Moal 5593b1a94c8SDamien Le Moal /* 5603b1a94c8SDamien Le Moal * Mark a metadata block dirty. 5613b1a94c8SDamien Le Moal */ 5623b1a94c8SDamien Le Moal static void dmz_dirty_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk) 5633b1a94c8SDamien Le Moal { 5643b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 5653b1a94c8SDamien Le Moal if (!test_and_set_bit(DMZ_META_DIRTY, &mblk->state)) 5663b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_dirty_list); 5673b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 5683b1a94c8SDamien Le Moal } 5693b1a94c8SDamien Le Moal 5703b1a94c8SDamien Le Moal /* 5713b1a94c8SDamien Le Moal * Issue a metadata block write BIO. 5723b1a94c8SDamien Le Moal */ 5733b1a94c8SDamien Le Moal static void dmz_write_mblock(struct dmz_metadata *zmd, struct dmz_mblock *mblk, 5743b1a94c8SDamien Le Moal unsigned int set) 5753b1a94c8SDamien Le Moal { 5763b1a94c8SDamien Le Moal sector_t block = zmd->sb[set].block + mblk->no; 5773b1a94c8SDamien Le Moal struct bio *bio; 5783b1a94c8SDamien Le Moal 5793b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 5803b1a94c8SDamien Le Moal if (!bio) { 5813b1a94c8SDamien Le Moal set_bit(DMZ_META_ERROR, &mblk->state); 5823b1a94c8SDamien Le Moal return; 5833b1a94c8SDamien Le Moal } 5843b1a94c8SDamien Le Moal 5853b1a94c8SDamien Le Moal set_bit(DMZ_META_WRITING, &mblk->state); 5863b1a94c8SDamien Le Moal 5873b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 58874d46992SChristoph Hellwig bio_set_dev(bio, zmd->dev->bdev); 5893b1a94c8SDamien Le Moal bio->bi_private = mblk; 5903b1a94c8SDamien Le Moal bio->bi_end_io = dmz_mblock_bio_end_io; 5913b1a94c8SDamien Le Moal bio_set_op_attrs(bio, REQ_OP_WRITE, REQ_META | REQ_PRIO); 5923b1a94c8SDamien Le Moal bio_add_page(bio, mblk->page, DMZ_BLOCK_SIZE, 0); 5933b1a94c8SDamien Le Moal submit_bio(bio); 5943b1a94c8SDamien Le Moal } 5953b1a94c8SDamien Le Moal 5963b1a94c8SDamien Le Moal /* 5973b1a94c8SDamien Le Moal * Read/write a metadata block. 5983b1a94c8SDamien Le Moal */ 5993b1a94c8SDamien Le Moal static int dmz_rdwr_block(struct dmz_metadata *zmd, int op, sector_t block, 6003b1a94c8SDamien Le Moal struct page *page) 6013b1a94c8SDamien Le Moal { 6023b1a94c8SDamien Le Moal struct bio *bio; 6033b1a94c8SDamien Le Moal int ret; 6043b1a94c8SDamien Le Moal 6053b1a94c8SDamien Le Moal bio = bio_alloc(GFP_NOIO, 1); 6063b1a94c8SDamien Le Moal if (!bio) 6073b1a94c8SDamien Le Moal return -ENOMEM; 6083b1a94c8SDamien Le Moal 6093b1a94c8SDamien Le Moal bio->bi_iter.bi_sector = dmz_blk2sect(block); 61074d46992SChristoph Hellwig bio_set_dev(bio, zmd->dev->bdev); 6113b1a94c8SDamien Le Moal bio_set_op_attrs(bio, op, REQ_SYNC | REQ_META | REQ_PRIO); 6123b1a94c8SDamien Le Moal bio_add_page(bio, page, DMZ_BLOCK_SIZE, 0); 6133b1a94c8SDamien Le Moal ret = submit_bio_wait(bio); 6143b1a94c8SDamien Le Moal bio_put(bio); 6153b1a94c8SDamien Le Moal 6163b1a94c8SDamien Le Moal return ret; 6173b1a94c8SDamien Le Moal } 6183b1a94c8SDamien Le Moal 6193b1a94c8SDamien Le Moal /* 6203b1a94c8SDamien Le Moal * Write super block of the specified metadata set. 6213b1a94c8SDamien Le Moal */ 6223b1a94c8SDamien Le Moal static int dmz_write_sb(struct dmz_metadata *zmd, unsigned int set) 6233b1a94c8SDamien Le Moal { 6243b1a94c8SDamien Le Moal sector_t block = zmd->sb[set].block; 6253b1a94c8SDamien Le Moal struct dmz_mblock *mblk = zmd->sb[set].mblk; 6263b1a94c8SDamien Le Moal struct dmz_super *sb = zmd->sb[set].sb; 6273b1a94c8SDamien Le Moal u64 sb_gen = zmd->sb_gen + 1; 6283b1a94c8SDamien Le Moal int ret; 6293b1a94c8SDamien Le Moal 6303b1a94c8SDamien Le Moal sb->magic = cpu_to_le32(DMZ_MAGIC); 6313b1a94c8SDamien Le Moal sb->version = cpu_to_le32(DMZ_META_VER); 6323b1a94c8SDamien Le Moal 6333b1a94c8SDamien Le Moal sb->gen = cpu_to_le64(sb_gen); 6343b1a94c8SDamien Le Moal 6353b1a94c8SDamien Le Moal sb->sb_block = cpu_to_le64(block); 6363b1a94c8SDamien Le Moal sb->nr_meta_blocks = cpu_to_le32(zmd->nr_meta_blocks); 6373b1a94c8SDamien Le Moal sb->nr_reserved_seq = cpu_to_le32(zmd->nr_reserved_seq); 6383b1a94c8SDamien Le Moal sb->nr_chunks = cpu_to_le32(zmd->nr_chunks); 6393b1a94c8SDamien Le Moal 6403b1a94c8SDamien Le Moal sb->nr_map_blocks = cpu_to_le32(zmd->nr_map_blocks); 6413b1a94c8SDamien Le Moal sb->nr_bitmap_blocks = cpu_to_le32(zmd->nr_bitmap_blocks); 6423b1a94c8SDamien Le Moal 6433b1a94c8SDamien Le Moal sb->crc = 0; 6443b1a94c8SDamien Le Moal sb->crc = cpu_to_le32(crc32_le(sb_gen, (unsigned char *)sb, DMZ_BLOCK_SIZE)); 6453b1a94c8SDamien Le Moal 6463b1a94c8SDamien Le Moal ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, block, mblk->page); 6473b1a94c8SDamien Le Moal if (ret == 0) 6484218a955SDamien Le Moal ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); 6493b1a94c8SDamien Le Moal 6503b1a94c8SDamien Le Moal return ret; 6513b1a94c8SDamien Le Moal } 6523b1a94c8SDamien Le Moal 6533b1a94c8SDamien Le Moal /* 6543b1a94c8SDamien Le Moal * Write dirty metadata blocks to the specified set. 6553b1a94c8SDamien Le Moal */ 6563b1a94c8SDamien Le Moal static int dmz_write_dirty_mblocks(struct dmz_metadata *zmd, 6573b1a94c8SDamien Le Moal struct list_head *write_list, 6583b1a94c8SDamien Le Moal unsigned int set) 6593b1a94c8SDamien Le Moal { 6603b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 6613b1a94c8SDamien Le Moal struct blk_plug plug; 6623b1a94c8SDamien Le Moal int ret = 0; 6633b1a94c8SDamien Le Moal 6643b1a94c8SDamien Le Moal /* Issue writes */ 6653b1a94c8SDamien Le Moal blk_start_plug(&plug); 6663b1a94c8SDamien Le Moal list_for_each_entry(mblk, write_list, link) 6673b1a94c8SDamien Le Moal dmz_write_mblock(zmd, mblk, set); 6683b1a94c8SDamien Le Moal blk_finish_plug(&plug); 6693b1a94c8SDamien Le Moal 6703b1a94c8SDamien Le Moal /* Wait for completion */ 6713b1a94c8SDamien Le Moal list_for_each_entry(mblk, write_list, link) { 6723b1a94c8SDamien Le Moal wait_on_bit_io(&mblk->state, DMZ_META_WRITING, 6733b1a94c8SDamien Le Moal TASK_UNINTERRUPTIBLE); 6743b1a94c8SDamien Le Moal if (test_bit(DMZ_META_ERROR, &mblk->state)) { 6753b1a94c8SDamien Le Moal clear_bit(DMZ_META_ERROR, &mblk->state); 6763b1a94c8SDamien Le Moal ret = -EIO; 6773b1a94c8SDamien Le Moal } 6783b1a94c8SDamien Le Moal } 6793b1a94c8SDamien Le Moal 6803b1a94c8SDamien Le Moal /* Flush drive cache (this will also sync data) */ 6813b1a94c8SDamien Le Moal if (ret == 0) 6824218a955SDamien Le Moal ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); 6833b1a94c8SDamien Le Moal 6843b1a94c8SDamien Le Moal return ret; 6853b1a94c8SDamien Le Moal } 6863b1a94c8SDamien Le Moal 6873b1a94c8SDamien Le Moal /* 6883b1a94c8SDamien Le Moal * Log dirty metadata blocks. 6893b1a94c8SDamien Le Moal */ 6903b1a94c8SDamien Le Moal static int dmz_log_dirty_mblocks(struct dmz_metadata *zmd, 6913b1a94c8SDamien Le Moal struct list_head *write_list) 6923b1a94c8SDamien Le Moal { 6933b1a94c8SDamien Le Moal unsigned int log_set = zmd->mblk_primary ^ 0x1; 6943b1a94c8SDamien Le Moal int ret; 6953b1a94c8SDamien Le Moal 6963b1a94c8SDamien Le Moal /* Write dirty blocks to the log */ 6973b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, write_list, log_set); 6983b1a94c8SDamien Le Moal if (ret) 6993b1a94c8SDamien Le Moal return ret; 7003b1a94c8SDamien Le Moal 7013b1a94c8SDamien Le Moal /* 7023b1a94c8SDamien Le Moal * No error so far: now validate the log by updating the 7033b1a94c8SDamien Le Moal * log index super block generation. 7043b1a94c8SDamien Le Moal */ 7053b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, log_set); 7063b1a94c8SDamien Le Moal if (ret) 7073b1a94c8SDamien Le Moal return ret; 7083b1a94c8SDamien Le Moal 7093b1a94c8SDamien Le Moal return 0; 7103b1a94c8SDamien Le Moal } 7113b1a94c8SDamien Le Moal 7123b1a94c8SDamien Le Moal /* 7133b1a94c8SDamien Le Moal * Flush dirty metadata blocks. 7143b1a94c8SDamien Le Moal */ 7153b1a94c8SDamien Le Moal int dmz_flush_metadata(struct dmz_metadata *zmd) 7163b1a94c8SDamien Le Moal { 7173b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 7183b1a94c8SDamien Le Moal struct list_head write_list; 7193b1a94c8SDamien Le Moal int ret; 7203b1a94c8SDamien Le Moal 7213b1a94c8SDamien Le Moal if (WARN_ON(!zmd)) 7223b1a94c8SDamien Le Moal return 0; 7233b1a94c8SDamien Le Moal 7243b1a94c8SDamien Le Moal INIT_LIST_HEAD(&write_list); 7253b1a94c8SDamien Le Moal 7263b1a94c8SDamien Le Moal /* 7273b1a94c8SDamien Le Moal * Make sure that metadata blocks are stable before logging: take 7283b1a94c8SDamien Le Moal * the write lock on the metadata semaphore to prevent target BIOs 7293b1a94c8SDamien Le Moal * from modifying metadata. 7303b1a94c8SDamien Le Moal */ 7313b1a94c8SDamien Le Moal down_write(&zmd->mblk_sem); 7323b1a94c8SDamien Le Moal 7333b1a94c8SDamien Le Moal /* 7343b1a94c8SDamien Le Moal * This is called from the target flush work and reclaim work. 7353b1a94c8SDamien Le Moal * Concurrent execution is not allowed. 7363b1a94c8SDamien Le Moal */ 7373b1a94c8SDamien Le Moal dmz_lock_flush(zmd); 7383b1a94c8SDamien Le Moal 7393b1a94c8SDamien Le Moal /* Get dirty blocks */ 7403b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 7413b1a94c8SDamien Le Moal list_splice_init(&zmd->mblk_dirty_list, &write_list); 7423b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 7433b1a94c8SDamien Le Moal 7443b1a94c8SDamien Le Moal /* If there are no dirty metadata blocks, just flush the device cache */ 7453b1a94c8SDamien Le Moal if (list_empty(&write_list)) { 7464218a955SDamien Le Moal ret = blkdev_issue_flush(zmd->dev->bdev, GFP_NOIO, NULL); 7473b1a94c8SDamien Le Moal goto out; 7483b1a94c8SDamien Le Moal } 7493b1a94c8SDamien Le Moal 7503b1a94c8SDamien Le Moal /* 7513b1a94c8SDamien Le Moal * The primary metadata set is still clean. Keep it this way until 7523b1a94c8SDamien Le Moal * all updates are successful in the secondary set. That is, use 7533b1a94c8SDamien Le Moal * the secondary set as a log. 7543b1a94c8SDamien Le Moal */ 7553b1a94c8SDamien Le Moal ret = dmz_log_dirty_mblocks(zmd, &write_list); 7563b1a94c8SDamien Le Moal if (ret) 7573b1a94c8SDamien Le Moal goto out; 7583b1a94c8SDamien Le Moal 7593b1a94c8SDamien Le Moal /* 7603b1a94c8SDamien Le Moal * The log is on disk. It is now safe to update in place 7613b1a94c8SDamien Le Moal * in the primary metadata set. 7623b1a94c8SDamien Le Moal */ 7633b1a94c8SDamien Le Moal ret = dmz_write_dirty_mblocks(zmd, &write_list, zmd->mblk_primary); 7643b1a94c8SDamien Le Moal if (ret) 7653b1a94c8SDamien Le Moal goto out; 7663b1a94c8SDamien Le Moal 7673b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, zmd->mblk_primary); 7683b1a94c8SDamien Le Moal if (ret) 7693b1a94c8SDamien Le Moal goto out; 7703b1a94c8SDamien Le Moal 7713b1a94c8SDamien Le Moal while (!list_empty(&write_list)) { 7723b1a94c8SDamien Le Moal mblk = list_first_entry(&write_list, struct dmz_mblock, link); 7733b1a94c8SDamien Le Moal list_del_init(&mblk->link); 7743b1a94c8SDamien Le Moal 7753b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 7763b1a94c8SDamien Le Moal clear_bit(DMZ_META_DIRTY, &mblk->state); 77733c2865fSDamien Le Moal if (mblk->ref == 0) 7783b1a94c8SDamien Le Moal list_add_tail(&mblk->link, &zmd->mblk_lru_list); 7793b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 7803b1a94c8SDamien Le Moal } 7813b1a94c8SDamien Le Moal 7823b1a94c8SDamien Le Moal zmd->sb_gen++; 7833b1a94c8SDamien Le Moal out: 7843b1a94c8SDamien Le Moal if (ret && !list_empty(&write_list)) { 7853b1a94c8SDamien Le Moal spin_lock(&zmd->mblk_lock); 7863b1a94c8SDamien Le Moal list_splice(&write_list, &zmd->mblk_dirty_list); 7873b1a94c8SDamien Le Moal spin_unlock(&zmd->mblk_lock); 7883b1a94c8SDamien Le Moal } 7893b1a94c8SDamien Le Moal 7903b1a94c8SDamien Le Moal dmz_unlock_flush(zmd); 7913b1a94c8SDamien Le Moal up_write(&zmd->mblk_sem); 7923b1a94c8SDamien Le Moal 7933b1a94c8SDamien Le Moal return ret; 7943b1a94c8SDamien Le Moal } 7953b1a94c8SDamien Le Moal 7963b1a94c8SDamien Le Moal /* 7973b1a94c8SDamien Le Moal * Check super block. 7983b1a94c8SDamien Le Moal */ 7993b1a94c8SDamien Le Moal static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_super *sb) 8003b1a94c8SDamien Le Moal { 8013b1a94c8SDamien Le Moal unsigned int nr_meta_zones, nr_data_zones; 8023b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 8033b1a94c8SDamien Le Moal u32 crc, stored_crc; 8043b1a94c8SDamien Le Moal u64 gen; 8053b1a94c8SDamien Le Moal 8063b1a94c8SDamien Le Moal gen = le64_to_cpu(sb->gen); 8073b1a94c8SDamien Le Moal stored_crc = le32_to_cpu(sb->crc); 8083b1a94c8SDamien Le Moal sb->crc = 0; 8093b1a94c8SDamien Le Moal crc = crc32_le(gen, (unsigned char *)sb, DMZ_BLOCK_SIZE); 8103b1a94c8SDamien Le Moal if (crc != stored_crc) { 8113b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid checksum (needed 0x%08x, got 0x%08x)", 8123b1a94c8SDamien Le Moal crc, stored_crc); 8133b1a94c8SDamien Le Moal return -ENXIO; 8143b1a94c8SDamien Le Moal } 8153b1a94c8SDamien Le Moal 8163b1a94c8SDamien Le Moal if (le32_to_cpu(sb->magic) != DMZ_MAGIC) { 8173b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid meta magic (needed 0x%08x, got 0x%08x)", 8183b1a94c8SDamien Le Moal DMZ_MAGIC, le32_to_cpu(sb->magic)); 8193b1a94c8SDamien Le Moal return -ENXIO; 8203b1a94c8SDamien Le Moal } 8213b1a94c8SDamien Le Moal 8223b1a94c8SDamien Le Moal if (le32_to_cpu(sb->version) != DMZ_META_VER) { 8233b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid meta version (needed %d, got %d)", 8243b1a94c8SDamien Le Moal DMZ_META_VER, le32_to_cpu(sb->version)); 8253b1a94c8SDamien Le Moal return -ENXIO; 8263b1a94c8SDamien Le Moal } 8273b1a94c8SDamien Le Moal 8283b1a94c8SDamien Le Moal nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + dev->zone_nr_blocks - 1) 8293b1a94c8SDamien Le Moal >> dev->zone_nr_blocks_shift; 8303b1a94c8SDamien Le Moal if (!nr_meta_zones || 8313b1a94c8SDamien Le Moal nr_meta_zones >= zmd->nr_rnd_zones) { 8323b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of metadata blocks"); 8333b1a94c8SDamien Le Moal return -ENXIO; 8343b1a94c8SDamien Le Moal } 8353b1a94c8SDamien Le Moal 8363b1a94c8SDamien Le Moal if (!le32_to_cpu(sb->nr_reserved_seq) || 8373b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_reserved_seq) >= (zmd->nr_useable_zones - nr_meta_zones)) { 8383b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of reserved sequential zones"); 8393b1a94c8SDamien Le Moal return -ENXIO; 8403b1a94c8SDamien Le Moal } 8413b1a94c8SDamien Le Moal 8423b1a94c8SDamien Le Moal nr_data_zones = zmd->nr_useable_zones - 8433b1a94c8SDamien Le Moal (nr_meta_zones * 2 + le32_to_cpu(sb->nr_reserved_seq)); 8443b1a94c8SDamien Le Moal if (le32_to_cpu(sb->nr_chunks) > nr_data_zones) { 8453b1a94c8SDamien Le Moal dmz_dev_err(dev, "Invalid number of chunks %u / %u", 8463b1a94c8SDamien Le Moal le32_to_cpu(sb->nr_chunks), nr_data_zones); 8473b1a94c8SDamien Le Moal return -ENXIO; 8483b1a94c8SDamien Le Moal } 8493b1a94c8SDamien Le Moal 8503b1a94c8SDamien Le Moal /* OK */ 8513b1a94c8SDamien Le Moal zmd->nr_meta_blocks = le32_to_cpu(sb->nr_meta_blocks); 8523b1a94c8SDamien Le Moal zmd->nr_reserved_seq = le32_to_cpu(sb->nr_reserved_seq); 8533b1a94c8SDamien Le Moal zmd->nr_chunks = le32_to_cpu(sb->nr_chunks); 8543b1a94c8SDamien Le Moal zmd->nr_map_blocks = le32_to_cpu(sb->nr_map_blocks); 8553b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks = le32_to_cpu(sb->nr_bitmap_blocks); 8563b1a94c8SDamien Le Moal zmd->nr_meta_zones = nr_meta_zones; 8573b1a94c8SDamien Le Moal zmd->nr_data_zones = nr_data_zones; 8583b1a94c8SDamien Le Moal 8593b1a94c8SDamien Le Moal return 0; 8603b1a94c8SDamien Le Moal } 8613b1a94c8SDamien Le Moal 8623b1a94c8SDamien Le Moal /* 8633b1a94c8SDamien Le Moal * Read the first or second super block from disk. 8643b1a94c8SDamien Le Moal */ 8653b1a94c8SDamien Le Moal static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set) 8663b1a94c8SDamien Le Moal { 8673b1a94c8SDamien Le Moal return dmz_rdwr_block(zmd, REQ_OP_READ, zmd->sb[set].block, 8683b1a94c8SDamien Le Moal zmd->sb[set].mblk->page); 8693b1a94c8SDamien Le Moal } 8703b1a94c8SDamien Le Moal 8713b1a94c8SDamien Le Moal /* 8723b1a94c8SDamien Le Moal * Determine the position of the secondary super blocks on disk. 8733b1a94c8SDamien Le Moal * This is used only if a corruption of the primary super block 8743b1a94c8SDamien Le Moal * is detected. 8753b1a94c8SDamien Le Moal */ 8763b1a94c8SDamien Le Moal static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd) 8773b1a94c8SDamien Le Moal { 8783b1a94c8SDamien Le Moal unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; 8793b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 8803b1a94c8SDamien Le Moal int i; 8813b1a94c8SDamien Le Moal 8823b1a94c8SDamien Le Moal /* Allocate a block */ 8833b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 8843b1a94c8SDamien Le Moal if (!mblk) 8853b1a94c8SDamien Le Moal return -ENOMEM; 8863b1a94c8SDamien Le Moal 8873b1a94c8SDamien Le Moal zmd->sb[1].mblk = mblk; 8883b1a94c8SDamien Le Moal zmd->sb[1].sb = mblk->data; 8893b1a94c8SDamien Le Moal 8903b1a94c8SDamien Le Moal /* Bad first super block: search for the second one */ 8913b1a94c8SDamien Le Moal zmd->sb[1].block = zmd->sb[0].block + zone_nr_blocks; 8923b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_rnd_zones - 1; i++) { 8933b1a94c8SDamien Le Moal if (dmz_read_sb(zmd, 1) != 0) 8943b1a94c8SDamien Le Moal break; 8953b1a94c8SDamien Le Moal if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC) 8963b1a94c8SDamien Le Moal return 0; 8973b1a94c8SDamien Le Moal zmd->sb[1].block += zone_nr_blocks; 8983b1a94c8SDamien Le Moal } 8993b1a94c8SDamien Le Moal 9003b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 9013b1a94c8SDamien Le Moal zmd->sb[1].mblk = NULL; 9023b1a94c8SDamien Le Moal 9033b1a94c8SDamien Le Moal return -EIO; 9043b1a94c8SDamien Le Moal } 9053b1a94c8SDamien Le Moal 9063b1a94c8SDamien Le Moal /* 9073b1a94c8SDamien Le Moal * Read the first or second super block from disk. 9083b1a94c8SDamien Le Moal */ 9093b1a94c8SDamien Le Moal static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set) 9103b1a94c8SDamien Le Moal { 9113b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 9123b1a94c8SDamien Le Moal int ret; 9133b1a94c8SDamien Le Moal 9143b1a94c8SDamien Le Moal /* Allocate a block */ 9153b1a94c8SDamien Le Moal mblk = dmz_alloc_mblock(zmd, 0); 9163b1a94c8SDamien Le Moal if (!mblk) 9173b1a94c8SDamien Le Moal return -ENOMEM; 9183b1a94c8SDamien Le Moal 9193b1a94c8SDamien Le Moal zmd->sb[set].mblk = mblk; 9203b1a94c8SDamien Le Moal zmd->sb[set].sb = mblk->data; 9213b1a94c8SDamien Le Moal 9223b1a94c8SDamien Le Moal /* Read super block */ 9233b1a94c8SDamien Le Moal ret = dmz_read_sb(zmd, set); 9243b1a94c8SDamien Le Moal if (ret) { 9253b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 9263b1a94c8SDamien Le Moal zmd->sb[set].mblk = NULL; 9273b1a94c8SDamien Le Moal return ret; 9283b1a94c8SDamien Le Moal } 9293b1a94c8SDamien Le Moal 9303b1a94c8SDamien Le Moal return 0; 9313b1a94c8SDamien Le Moal } 9323b1a94c8SDamien Le Moal 9333b1a94c8SDamien Le Moal /* 9343b1a94c8SDamien Le Moal * Recover a metadata set. 9353b1a94c8SDamien Le Moal */ 9363b1a94c8SDamien Le Moal static int dmz_recover_mblocks(struct dmz_metadata *zmd, unsigned int dst_set) 9373b1a94c8SDamien Le Moal { 9383b1a94c8SDamien Le Moal unsigned int src_set = dst_set ^ 0x1; 9393b1a94c8SDamien Le Moal struct page *page; 9403b1a94c8SDamien Le Moal int i, ret; 9413b1a94c8SDamien Le Moal 9423b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "Metadata set %u invalid: recovering", dst_set); 9433b1a94c8SDamien Le Moal 9443b1a94c8SDamien Le Moal if (dst_set == 0) 9453b1a94c8SDamien Le Moal zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); 9463b1a94c8SDamien Le Moal else { 9473b1a94c8SDamien Le Moal zmd->sb[1].block = zmd->sb[0].block + 9483b1a94c8SDamien Le Moal (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); 9493b1a94c8SDamien Le Moal } 9503b1a94c8SDamien Le Moal 9514218a955SDamien Le Moal page = alloc_page(GFP_NOIO); 9523b1a94c8SDamien Le Moal if (!page) 9533b1a94c8SDamien Le Moal return -ENOMEM; 9543b1a94c8SDamien Le Moal 9553b1a94c8SDamien Le Moal /* Copy metadata blocks */ 9563b1a94c8SDamien Le Moal for (i = 1; i < zmd->nr_meta_blocks; i++) { 9573b1a94c8SDamien Le Moal ret = dmz_rdwr_block(zmd, REQ_OP_READ, 9583b1a94c8SDamien Le Moal zmd->sb[src_set].block + i, page); 9593b1a94c8SDamien Le Moal if (ret) 9603b1a94c8SDamien Le Moal goto out; 9613b1a94c8SDamien Le Moal ret = dmz_rdwr_block(zmd, REQ_OP_WRITE, 9623b1a94c8SDamien Le Moal zmd->sb[dst_set].block + i, page); 9633b1a94c8SDamien Le Moal if (ret) 9643b1a94c8SDamien Le Moal goto out; 9653b1a94c8SDamien Le Moal } 9663b1a94c8SDamien Le Moal 9673b1a94c8SDamien Le Moal /* Finalize with the super block */ 9683b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 9693b1a94c8SDamien Le Moal zmd->sb[dst_set].mblk = dmz_alloc_mblock(zmd, 0); 9703b1a94c8SDamien Le Moal if (!zmd->sb[dst_set].mblk) { 9713b1a94c8SDamien Le Moal ret = -ENOMEM; 9723b1a94c8SDamien Le Moal goto out; 9733b1a94c8SDamien Le Moal } 9743b1a94c8SDamien Le Moal zmd->sb[dst_set].sb = zmd->sb[dst_set].mblk->data; 9753b1a94c8SDamien Le Moal } 9763b1a94c8SDamien Le Moal 9773b1a94c8SDamien Le Moal ret = dmz_write_sb(zmd, dst_set); 9783b1a94c8SDamien Le Moal out: 9793b1a94c8SDamien Le Moal __free_pages(page, 0); 9803b1a94c8SDamien Le Moal 9813b1a94c8SDamien Le Moal return ret; 9823b1a94c8SDamien Le Moal } 9833b1a94c8SDamien Le Moal 9843b1a94c8SDamien Le Moal /* 9853b1a94c8SDamien Le Moal * Get super block from disk. 9863b1a94c8SDamien Le Moal */ 9873b1a94c8SDamien Le Moal static int dmz_load_sb(struct dmz_metadata *zmd) 9883b1a94c8SDamien Le Moal { 9893b1a94c8SDamien Le Moal bool sb_good[2] = {false, false}; 9903b1a94c8SDamien Le Moal u64 sb_gen[2] = {0, 0}; 9913b1a94c8SDamien Le Moal int ret; 9923b1a94c8SDamien Le Moal 9933b1a94c8SDamien Le Moal /* Read and check the primary super block */ 9943b1a94c8SDamien Le Moal zmd->sb[0].block = dmz_start_block(zmd, zmd->sb_zone); 9953b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 0); 9963b1a94c8SDamien Le Moal if (ret) { 9973b1a94c8SDamien Le Moal dmz_dev_err(zmd->dev, "Read primary super block failed"); 9983b1a94c8SDamien Le Moal return ret; 9993b1a94c8SDamien Le Moal } 10003b1a94c8SDamien Le Moal 10013b1a94c8SDamien Le Moal ret = dmz_check_sb(zmd, zmd->sb[0].sb); 10023b1a94c8SDamien Le Moal 10033b1a94c8SDamien Le Moal /* Read and check secondary super block */ 10043b1a94c8SDamien Le Moal if (ret == 0) { 10053b1a94c8SDamien Le Moal sb_good[0] = true; 10063b1a94c8SDamien Le Moal zmd->sb[1].block = zmd->sb[0].block + 10073b1a94c8SDamien Le Moal (zmd->nr_meta_zones << zmd->dev->zone_nr_blocks_shift); 10083b1a94c8SDamien Le Moal ret = dmz_get_sb(zmd, 1); 10093b1a94c8SDamien Le Moal } else 10103b1a94c8SDamien Le Moal ret = dmz_lookup_secondary_sb(zmd); 10113b1a94c8SDamien Le Moal 10123b1a94c8SDamien Le Moal if (ret) { 10133b1a94c8SDamien Le Moal dmz_dev_err(zmd->dev, "Read secondary super block failed"); 10143b1a94c8SDamien Le Moal return ret; 10153b1a94c8SDamien Le Moal } 10163b1a94c8SDamien Le Moal 10173b1a94c8SDamien Le Moal ret = dmz_check_sb(zmd, zmd->sb[1].sb); 10183b1a94c8SDamien Le Moal if (ret == 0) 10193b1a94c8SDamien Le Moal sb_good[1] = true; 10203b1a94c8SDamien Le Moal 10213b1a94c8SDamien Le Moal /* Use highest generation sb first */ 10223b1a94c8SDamien Le Moal if (!sb_good[0] && !sb_good[1]) { 10233b1a94c8SDamien Le Moal dmz_dev_err(zmd->dev, "No valid super block found"); 10243b1a94c8SDamien Le Moal return -EIO; 10253b1a94c8SDamien Le Moal } 10263b1a94c8SDamien Le Moal 10273b1a94c8SDamien Le Moal if (sb_good[0]) 10283b1a94c8SDamien Le Moal sb_gen[0] = le64_to_cpu(zmd->sb[0].sb->gen); 10293b1a94c8SDamien Le Moal else 10303b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 0); 10313b1a94c8SDamien Le Moal 10323b1a94c8SDamien Le Moal if (sb_good[1]) 10333b1a94c8SDamien Le Moal sb_gen[1] = le64_to_cpu(zmd->sb[1].sb->gen); 10343b1a94c8SDamien Le Moal else 10353b1a94c8SDamien Le Moal ret = dmz_recover_mblocks(zmd, 1); 10363b1a94c8SDamien Le Moal 10373b1a94c8SDamien Le Moal if (ret) { 10383b1a94c8SDamien Le Moal dmz_dev_err(zmd->dev, "Recovery failed"); 10393b1a94c8SDamien Le Moal return -EIO; 10403b1a94c8SDamien Le Moal } 10413b1a94c8SDamien Le Moal 10423b1a94c8SDamien Le Moal if (sb_gen[0] >= sb_gen[1]) { 10433b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[0]; 10443b1a94c8SDamien Le Moal zmd->mblk_primary = 0; 10453b1a94c8SDamien Le Moal } else { 10463b1a94c8SDamien Le Moal zmd->sb_gen = sb_gen[1]; 10473b1a94c8SDamien Le Moal zmd->mblk_primary = 1; 10483b1a94c8SDamien Le Moal } 10493b1a94c8SDamien Le Moal 10503b1a94c8SDamien Le Moal dmz_dev_debug(zmd->dev, "Using super block %u (gen %llu)", 10513b1a94c8SDamien Le Moal zmd->mblk_primary, zmd->sb_gen); 10523b1a94c8SDamien Le Moal 10533b1a94c8SDamien Le Moal return 0; 10543b1a94c8SDamien Le Moal } 10553b1a94c8SDamien Le Moal 10563b1a94c8SDamien Le Moal /* 10573b1a94c8SDamien Le Moal * Initialize a zone descriptor. 10583b1a94c8SDamien Le Moal */ 10593b1a94c8SDamien Le Moal static int dmz_init_zone(struct dmz_metadata *zmd, struct dm_zone *zone, 10603b1a94c8SDamien Le Moal struct blk_zone *blkz) 10613b1a94c8SDamien Le Moal { 10623b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 10633b1a94c8SDamien Le Moal 10643b1a94c8SDamien Le Moal /* Ignore the eventual last runt (smaller) zone */ 10653b1a94c8SDamien Le Moal if (blkz->len != dev->zone_nr_sectors) { 10663b1a94c8SDamien Le Moal if (blkz->start + blkz->len == dev->capacity) 10673b1a94c8SDamien Le Moal return 0; 10683b1a94c8SDamien Le Moal return -ENXIO; 10693b1a94c8SDamien Le Moal } 10703b1a94c8SDamien Le Moal 10713b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zone->link); 10723b1a94c8SDamien Le Moal atomic_set(&zone->refcount, 0); 10733b1a94c8SDamien Le Moal zone->chunk = DMZ_MAP_UNMAPPED; 10743b1a94c8SDamien Le Moal 10753b1a94c8SDamien Le Moal if (blkz->type == BLK_ZONE_TYPE_CONVENTIONAL) { 10763b1a94c8SDamien Le Moal set_bit(DMZ_RND, &zone->flags); 10773b1a94c8SDamien Le Moal zmd->nr_rnd_zones++; 10783b1a94c8SDamien Le Moal } else if (blkz->type == BLK_ZONE_TYPE_SEQWRITE_REQ || 10793b1a94c8SDamien Le Moal blkz->type == BLK_ZONE_TYPE_SEQWRITE_PREF) { 10803b1a94c8SDamien Le Moal set_bit(DMZ_SEQ, &zone->flags); 10813b1a94c8SDamien Le Moal } else 10823b1a94c8SDamien Le Moal return -ENXIO; 10833b1a94c8SDamien Le Moal 10843b1a94c8SDamien Le Moal if (blkz->cond == BLK_ZONE_COND_OFFLINE) 10853b1a94c8SDamien Le Moal set_bit(DMZ_OFFLINE, &zone->flags); 10863b1a94c8SDamien Le Moal else if (blkz->cond == BLK_ZONE_COND_READONLY) 10873b1a94c8SDamien Le Moal set_bit(DMZ_READ_ONLY, &zone->flags); 10883b1a94c8SDamien Le Moal 10893b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) 10903b1a94c8SDamien Le Moal zone->wp_block = 0; 10913b1a94c8SDamien Le Moal else 10923b1a94c8SDamien Le Moal zone->wp_block = dmz_sect2blk(blkz->wp - blkz->start); 10933b1a94c8SDamien Le Moal 10943b1a94c8SDamien Le Moal if (!dmz_is_offline(zone) && !dmz_is_readonly(zone)) { 10953b1a94c8SDamien Le Moal zmd->nr_useable_zones++; 10963b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) { 10973b1a94c8SDamien Le Moal zmd->nr_rnd_zones++; 10983b1a94c8SDamien Le Moal if (!zmd->sb_zone) { 10993b1a94c8SDamien Le Moal /* Super block zone */ 11003b1a94c8SDamien Le Moal zmd->sb_zone = zone; 11013b1a94c8SDamien Le Moal } 11023b1a94c8SDamien Le Moal } 11033b1a94c8SDamien Le Moal } 11043b1a94c8SDamien Le Moal 11053b1a94c8SDamien Le Moal return 0; 11063b1a94c8SDamien Le Moal } 11073b1a94c8SDamien Le Moal 11083b1a94c8SDamien Le Moal /* 11093b1a94c8SDamien Le Moal * Free zones descriptors. 11103b1a94c8SDamien Le Moal */ 11113b1a94c8SDamien Le Moal static void dmz_drop_zones(struct dmz_metadata *zmd) 11123b1a94c8SDamien Le Moal { 11133b1a94c8SDamien Le Moal kfree(zmd->zones); 11143b1a94c8SDamien Le Moal zmd->zones = NULL; 11153b1a94c8SDamien Le Moal } 11163b1a94c8SDamien Le Moal 11173b1a94c8SDamien Le Moal /* 11183b1a94c8SDamien Le Moal * The size of a zone report in number of zones. 11193b1a94c8SDamien Le Moal * This results in 4096*64B=256KB report zones commands. 11203b1a94c8SDamien Le Moal */ 11213b1a94c8SDamien Le Moal #define DMZ_REPORT_NR_ZONES 4096 11223b1a94c8SDamien Le Moal 11233b1a94c8SDamien Le Moal /* 11243b1a94c8SDamien Le Moal * Allocate and initialize zone descriptors using the zone 11253b1a94c8SDamien Le Moal * information from disk. 11263b1a94c8SDamien Le Moal */ 11273b1a94c8SDamien Le Moal static int dmz_init_zones(struct dmz_metadata *zmd) 11283b1a94c8SDamien Le Moal { 11293b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 11303b1a94c8SDamien Le Moal struct dm_zone *zone; 11313b1a94c8SDamien Le Moal struct blk_zone *blkz; 11323b1a94c8SDamien Le Moal unsigned int nr_blkz; 11333b1a94c8SDamien Le Moal sector_t sector = 0; 11343b1a94c8SDamien Le Moal int i, ret = 0; 11353b1a94c8SDamien Le Moal 11363b1a94c8SDamien Le Moal /* Init */ 11373b1a94c8SDamien Le Moal zmd->zone_bitmap_size = dev->zone_nr_blocks >> 3; 11383b1a94c8SDamien Le Moal zmd->zone_nr_bitmap_blocks = zmd->zone_bitmap_size >> DMZ_BLOCK_SHIFT; 11393b1a94c8SDamien Le Moal 11403b1a94c8SDamien Le Moal /* Allocate zone array */ 11413b1a94c8SDamien Le Moal zmd->zones = kcalloc(dev->nr_zones, sizeof(struct dm_zone), GFP_KERNEL); 11423b1a94c8SDamien Le Moal if (!zmd->zones) 11433b1a94c8SDamien Le Moal return -ENOMEM; 11443b1a94c8SDamien Le Moal 11453b1a94c8SDamien Le Moal dmz_dev_info(dev, "Using %zu B for zone information", 11463b1a94c8SDamien Le Moal sizeof(struct dm_zone) * dev->nr_zones); 11473b1a94c8SDamien Le Moal 11483b1a94c8SDamien Le Moal /* Get zone information */ 11493b1a94c8SDamien Le Moal nr_blkz = DMZ_REPORT_NR_ZONES; 11503b1a94c8SDamien Le Moal blkz = kcalloc(nr_blkz, sizeof(struct blk_zone), GFP_KERNEL); 11513b1a94c8SDamien Le Moal if (!blkz) { 11523b1a94c8SDamien Le Moal ret = -ENOMEM; 11533b1a94c8SDamien Le Moal goto out; 11543b1a94c8SDamien Le Moal } 11553b1a94c8SDamien Le Moal 11563b1a94c8SDamien Le Moal /* 11573b1a94c8SDamien Le Moal * Get zone information and initialize zone descriptors. 11583b1a94c8SDamien Le Moal * At the same time, determine where the super block 11593b1a94c8SDamien Le Moal * should be: first block of the first randomly writable 11603b1a94c8SDamien Le Moal * zone. 11613b1a94c8SDamien Le Moal */ 11623b1a94c8SDamien Le Moal zone = zmd->zones; 11633b1a94c8SDamien Le Moal while (sector < dev->capacity) { 11643b1a94c8SDamien Le Moal /* Get zone information */ 11653b1a94c8SDamien Le Moal nr_blkz = DMZ_REPORT_NR_ZONES; 1166bd976e52SDamien Le Moal ret = blkdev_report_zones(dev->bdev, sector, blkz, &nr_blkz); 11673b1a94c8SDamien Le Moal if (ret) { 11683b1a94c8SDamien Le Moal dmz_dev_err(dev, "Report zones failed %d", ret); 11693b1a94c8SDamien Le Moal goto out; 11703b1a94c8SDamien Le Moal } 11713b1a94c8SDamien Le Moal 11727aedf75fSDamien Le Moal if (!nr_blkz) 11737aedf75fSDamien Le Moal break; 11747aedf75fSDamien Le Moal 11753b1a94c8SDamien Le Moal /* Process report */ 11763b1a94c8SDamien Le Moal for (i = 0; i < nr_blkz; i++) { 11773b1a94c8SDamien Le Moal ret = dmz_init_zone(zmd, zone, &blkz[i]); 11783b1a94c8SDamien Le Moal if (ret) 11793b1a94c8SDamien Le Moal goto out; 11803b1a94c8SDamien Le Moal sector += dev->zone_nr_sectors; 11813b1a94c8SDamien Le Moal zone++; 11823b1a94c8SDamien Le Moal } 11833b1a94c8SDamien Le Moal } 11843b1a94c8SDamien Le Moal 11853b1a94c8SDamien Le Moal /* The entire zone configuration of the disk should now be known */ 11863b1a94c8SDamien Le Moal if (sector < dev->capacity) { 11873b1a94c8SDamien Le Moal dmz_dev_err(dev, "Failed to get correct zone information"); 11883b1a94c8SDamien Le Moal ret = -ENXIO; 11893b1a94c8SDamien Le Moal } 11903b1a94c8SDamien Le Moal out: 11913b1a94c8SDamien Le Moal kfree(blkz); 11923b1a94c8SDamien Le Moal if (ret) 11933b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 11943b1a94c8SDamien Le Moal 11953b1a94c8SDamien Le Moal return ret; 11963b1a94c8SDamien Le Moal } 11973b1a94c8SDamien Le Moal 11983b1a94c8SDamien Le Moal /* 11993b1a94c8SDamien Le Moal * Update a zone information. 12003b1a94c8SDamien Le Moal */ 12013b1a94c8SDamien Le Moal static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 12023b1a94c8SDamien Le Moal { 12033b1a94c8SDamien Le Moal unsigned int nr_blkz = 1; 1204bd976e52SDamien Le Moal unsigned int noio_flag; 12053b1a94c8SDamien Le Moal struct blk_zone blkz; 12063b1a94c8SDamien Le Moal int ret; 12073b1a94c8SDamien Le Moal 1208bd976e52SDamien Le Moal /* 1209bd976e52SDamien Le Moal * Get zone information from disk. Since blkdev_report_zones() uses 1210bd976e52SDamien Le Moal * GFP_KERNEL by default for memory allocations, set the per-task 1211bd976e52SDamien Le Moal * PF_MEMALLOC_NOIO flag so that all allocations are done as if 1212bd976e52SDamien Le Moal * GFP_NOIO was specified. 1213bd976e52SDamien Le Moal */ 1214bd976e52SDamien Le Moal noio_flag = memalloc_noio_save(); 12153b1a94c8SDamien Le Moal ret = blkdev_report_zones(zmd->dev->bdev, dmz_start_sect(zmd, zone), 1216bd976e52SDamien Le Moal &blkz, &nr_blkz); 1217bd976e52SDamien Le Moal memalloc_noio_restore(noio_flag); 12187aedf75fSDamien Le Moal if (!nr_blkz) 12197aedf75fSDamien Le Moal ret = -EIO; 12203b1a94c8SDamien Le Moal if (ret) { 12213b1a94c8SDamien Le Moal dmz_dev_err(zmd->dev, "Get zone %u report failed", 12223b1a94c8SDamien Le Moal dmz_id(zmd, zone)); 12233b1a94c8SDamien Le Moal return ret; 12243b1a94c8SDamien Le Moal } 12253b1a94c8SDamien Le Moal 12263b1a94c8SDamien Le Moal clear_bit(DMZ_OFFLINE, &zone->flags); 12273b1a94c8SDamien Le Moal clear_bit(DMZ_READ_ONLY, &zone->flags); 12283b1a94c8SDamien Le Moal if (blkz.cond == BLK_ZONE_COND_OFFLINE) 12293b1a94c8SDamien Le Moal set_bit(DMZ_OFFLINE, &zone->flags); 12303b1a94c8SDamien Le Moal else if (blkz.cond == BLK_ZONE_COND_READONLY) 12313b1a94c8SDamien Le Moal set_bit(DMZ_READ_ONLY, &zone->flags); 12323b1a94c8SDamien Le Moal 12333b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) 12343b1a94c8SDamien Le Moal zone->wp_block = dmz_sect2blk(blkz.wp - blkz.start); 12353b1a94c8SDamien Le Moal else 12363b1a94c8SDamien Le Moal zone->wp_block = 0; 12373b1a94c8SDamien Le Moal 12383b1a94c8SDamien Le Moal return 0; 12393b1a94c8SDamien Le Moal } 12403b1a94c8SDamien Le Moal 12413b1a94c8SDamien Le Moal /* 12423b1a94c8SDamien Le Moal * Check a zone write pointer position when the zone is marked 12433b1a94c8SDamien Le Moal * with the sequential write error flag. 12443b1a94c8SDamien Le Moal */ 12453b1a94c8SDamien Le Moal static int dmz_handle_seq_write_err(struct dmz_metadata *zmd, 12463b1a94c8SDamien Le Moal struct dm_zone *zone) 12473b1a94c8SDamien Le Moal { 12483b1a94c8SDamien Le Moal unsigned int wp = 0; 12493b1a94c8SDamien Le Moal int ret; 12503b1a94c8SDamien Le Moal 12513b1a94c8SDamien Le Moal wp = zone->wp_block; 12523b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 12533b1a94c8SDamien Le Moal if (ret) 12543b1a94c8SDamien Le Moal return ret; 12553b1a94c8SDamien Le Moal 12563b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "Processing zone %u write error (zone wp %u/%u)", 12573b1a94c8SDamien Le Moal dmz_id(zmd, zone), zone->wp_block, wp); 12583b1a94c8SDamien Le Moal 12593b1a94c8SDamien Le Moal if (zone->wp_block < wp) { 12603b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 12613b1a94c8SDamien Le Moal wp - zone->wp_block); 12623b1a94c8SDamien Le Moal } 12633b1a94c8SDamien Le Moal 12643b1a94c8SDamien Le Moal return 0; 12653b1a94c8SDamien Le Moal } 12663b1a94c8SDamien Le Moal 12673b1a94c8SDamien Le Moal static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id) 12683b1a94c8SDamien Le Moal { 12693b1a94c8SDamien Le Moal return &zmd->zones[zone_id]; 12703b1a94c8SDamien Le Moal } 12713b1a94c8SDamien Le Moal 12723b1a94c8SDamien Le Moal /* 12733b1a94c8SDamien Le Moal * Reset a zone write pointer. 12743b1a94c8SDamien Le Moal */ 12753b1a94c8SDamien Le Moal static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 12763b1a94c8SDamien Le Moal { 12773b1a94c8SDamien Le Moal int ret; 12783b1a94c8SDamien Le Moal 12793b1a94c8SDamien Le Moal /* 12803b1a94c8SDamien Le Moal * Ignore offline zones, read only zones, 12813b1a94c8SDamien Le Moal * and conventional zones. 12823b1a94c8SDamien Le Moal */ 12833b1a94c8SDamien Le Moal if (dmz_is_offline(zone) || 12843b1a94c8SDamien Le Moal dmz_is_readonly(zone) || 12853b1a94c8SDamien Le Moal dmz_is_rnd(zone)) 12863b1a94c8SDamien Le Moal return 0; 12873b1a94c8SDamien Le Moal 12883b1a94c8SDamien Le Moal if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) { 12893b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 12903b1a94c8SDamien Le Moal 12913b1a94c8SDamien Le Moal ret = blkdev_reset_zones(dev->bdev, 12923b1a94c8SDamien Le Moal dmz_start_sect(zmd, zone), 12934218a955SDamien Le Moal dev->zone_nr_sectors, GFP_NOIO); 12943b1a94c8SDamien Le Moal if (ret) { 12953b1a94c8SDamien Le Moal dmz_dev_err(dev, "Reset zone %u failed %d", 12963b1a94c8SDamien Le Moal dmz_id(zmd, zone), ret); 12973b1a94c8SDamien Le Moal return ret; 12983b1a94c8SDamien Le Moal } 12993b1a94c8SDamien Le Moal } 13003b1a94c8SDamien Le Moal 13013b1a94c8SDamien Le Moal /* Clear write error bit and rewind write pointer position */ 13023b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); 13033b1a94c8SDamien Le Moal zone->wp_block = 0; 13043b1a94c8SDamien Le Moal 13053b1a94c8SDamien Le Moal return 0; 13063b1a94c8SDamien Le Moal } 13073b1a94c8SDamien Le Moal 13083b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone); 13093b1a94c8SDamien Le Moal 13103b1a94c8SDamien Le Moal /* 13113b1a94c8SDamien Le Moal * Initialize chunk mapping. 13123b1a94c8SDamien Le Moal */ 13133b1a94c8SDamien Le Moal static int dmz_load_mapping(struct dmz_metadata *zmd) 13143b1a94c8SDamien Le Moal { 13153b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 13163b1a94c8SDamien Le Moal struct dm_zone *dzone, *bzone; 13173b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = NULL; 13183b1a94c8SDamien Le Moal struct dmz_map *dmap; 13193b1a94c8SDamien Le Moal unsigned int i = 0, e = 0, chunk = 0; 13203b1a94c8SDamien Le Moal unsigned int dzone_id; 13213b1a94c8SDamien Le Moal unsigned int bzone_id; 13223b1a94c8SDamien Le Moal 13233b1a94c8SDamien Le Moal /* Metadata block array for the chunk mapping table */ 13243b1a94c8SDamien Le Moal zmd->map_mblk = kcalloc(zmd->nr_map_blocks, 13253b1a94c8SDamien Le Moal sizeof(struct dmz_mblk *), GFP_KERNEL); 13263b1a94c8SDamien Le Moal if (!zmd->map_mblk) 13273b1a94c8SDamien Le Moal return -ENOMEM; 13283b1a94c8SDamien Le Moal 13293b1a94c8SDamien Le Moal /* Get chunk mapping table blocks and initialize zone mapping */ 13303b1a94c8SDamien Le Moal while (chunk < zmd->nr_chunks) { 13313b1a94c8SDamien Le Moal if (!dmap_mblk) { 13323b1a94c8SDamien Le Moal /* Get mapping block */ 13333b1a94c8SDamien Le Moal dmap_mblk = dmz_get_mblock(zmd, i + 1); 13343b1a94c8SDamien Le Moal if (IS_ERR(dmap_mblk)) 13353b1a94c8SDamien Le Moal return PTR_ERR(dmap_mblk); 13363b1a94c8SDamien Le Moal zmd->map_mblk[i] = dmap_mblk; 13373b1a94c8SDamien Le Moal dmap = (struct dmz_map *) dmap_mblk->data; 13383b1a94c8SDamien Le Moal i++; 13393b1a94c8SDamien Le Moal e = 0; 13403b1a94c8SDamien Le Moal } 13413b1a94c8SDamien Le Moal 13423b1a94c8SDamien Le Moal /* Check data zone */ 13433b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[e].dzone_id); 13443b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) 13453b1a94c8SDamien Le Moal goto next; 13463b1a94c8SDamien Le Moal 13473b1a94c8SDamien Le Moal if (dzone_id >= dev->nr_zones) { 13483b1a94c8SDamien Le Moal dmz_dev_err(dev, "Chunk %u mapping: invalid data zone ID %u", 13493b1a94c8SDamien Le Moal chunk, dzone_id); 13503b1a94c8SDamien Le Moal return -EIO; 13513b1a94c8SDamien Le Moal } 13523b1a94c8SDamien Le Moal 13533b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 13543b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 13553b1a94c8SDamien Le Moal dzone->chunk = chunk; 13563b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, dzone); 13573b1a94c8SDamien Le Moal 13583b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 13593b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 13603b1a94c8SDamien Le Moal else 13613b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 13623b1a94c8SDamien Le Moal 13633b1a94c8SDamien Le Moal /* Check buffer zone */ 13643b1a94c8SDamien Le Moal bzone_id = le32_to_cpu(dmap[e].bzone_id); 13653b1a94c8SDamien Le Moal if (bzone_id == DMZ_MAP_UNMAPPED) 13663b1a94c8SDamien Le Moal goto next; 13673b1a94c8SDamien Le Moal 13683b1a94c8SDamien Le Moal if (bzone_id >= dev->nr_zones) { 13693b1a94c8SDamien Le Moal dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone ID %u", 13703b1a94c8SDamien Le Moal chunk, bzone_id); 13713b1a94c8SDamien Le Moal return -EIO; 13723b1a94c8SDamien Le Moal } 13733b1a94c8SDamien Le Moal 13743b1a94c8SDamien Le Moal bzone = dmz_get(zmd, bzone_id); 13753b1a94c8SDamien Le Moal if (!dmz_is_rnd(bzone)) { 13763b1a94c8SDamien Le Moal dmz_dev_err(dev, "Chunk %u mapping: invalid buffer zone %u", 13773b1a94c8SDamien Le Moal chunk, bzone_id); 13783b1a94c8SDamien Le Moal return -EIO; 13793b1a94c8SDamien Le Moal } 13803b1a94c8SDamien Le Moal 13813b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &bzone->flags); 13823b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 13833b1a94c8SDamien Le Moal bzone->chunk = chunk; 13843b1a94c8SDamien Le Moal bzone->bzone = dzone; 13853b1a94c8SDamien Le Moal dzone->bzone = bzone; 13863b1a94c8SDamien Le Moal dmz_get_zone_weight(zmd, bzone); 13873b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 13883b1a94c8SDamien Le Moal next: 13893b1a94c8SDamien Le Moal chunk++; 13903b1a94c8SDamien Le Moal e++; 13913b1a94c8SDamien Le Moal if (e >= DMZ_MAP_ENTRIES) 13923b1a94c8SDamien Le Moal dmap_mblk = NULL; 13933b1a94c8SDamien Le Moal } 13943b1a94c8SDamien Le Moal 13953b1a94c8SDamien Le Moal /* 13963b1a94c8SDamien Le Moal * At this point, only meta zones and mapped data zones were 13973b1a94c8SDamien Le Moal * fully initialized. All remaining zones are unmapped data 13983b1a94c8SDamien Le Moal * zones. Finish initializing those here. 13993b1a94c8SDamien Le Moal */ 14003b1a94c8SDamien Le Moal for (i = 0; i < dev->nr_zones; i++) { 14013b1a94c8SDamien Le Moal dzone = dmz_get(zmd, i); 14023b1a94c8SDamien Le Moal if (dmz_is_meta(dzone)) 14033b1a94c8SDamien Le Moal continue; 14043b1a94c8SDamien Le Moal 14053b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 14063b1a94c8SDamien Le Moal zmd->nr_rnd++; 14073b1a94c8SDamien Le Moal else 14083b1a94c8SDamien Le Moal zmd->nr_seq++; 14093b1a94c8SDamien Le Moal 14103b1a94c8SDamien Le Moal if (dmz_is_data(dzone)) { 14113b1a94c8SDamien Le Moal /* Already initialized */ 14123b1a94c8SDamien Le Moal continue; 14133b1a94c8SDamien Le Moal } 14143b1a94c8SDamien Le Moal 14153b1a94c8SDamien Le Moal /* Unmapped data zone */ 14163b1a94c8SDamien Le Moal set_bit(DMZ_DATA, &dzone->flags); 14173b1a94c8SDamien Le Moal dzone->chunk = DMZ_MAP_UNMAPPED; 14183b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) { 14193b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_rnd_list); 14203b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 14213b1a94c8SDamien Le Moal } else if (atomic_read(&zmd->nr_reserved_seq_zones) < zmd->nr_reserved_seq) { 14223b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->reserved_seq_zones_list); 14233b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 14243b1a94c8SDamien Le Moal zmd->nr_seq--; 14253b1a94c8SDamien Le Moal } else { 14263b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->unmap_seq_list); 14273b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 14283b1a94c8SDamien Le Moal } 14293b1a94c8SDamien Le Moal } 14303b1a94c8SDamien Le Moal 14313b1a94c8SDamien Le Moal return 0; 14323b1a94c8SDamien Le Moal } 14333b1a94c8SDamien Le Moal 14343b1a94c8SDamien Le Moal /* 14353b1a94c8SDamien Le Moal * Set a data chunk mapping. 14363b1a94c8SDamien Le Moal */ 14373b1a94c8SDamien Le Moal static void dmz_set_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, 14383b1a94c8SDamien Le Moal unsigned int dzone_id, unsigned int bzone_id) 14393b1a94c8SDamien Le Moal { 14403b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 14413b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 14423b1a94c8SDamien Le Moal int map_idx = chunk & DMZ_MAP_ENTRIES_MASK; 14433b1a94c8SDamien Le Moal 14443b1a94c8SDamien Le Moal dmap[map_idx].dzone_id = cpu_to_le32(dzone_id); 14453b1a94c8SDamien Le Moal dmap[map_idx].bzone_id = cpu_to_le32(bzone_id); 14463b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, dmap_mblk); 14473b1a94c8SDamien Le Moal } 14483b1a94c8SDamien Le Moal 14493b1a94c8SDamien Le Moal /* 14503b1a94c8SDamien Le Moal * The list of mapped zones is maintained in LRU order. 14513b1a94c8SDamien Le Moal * This rotates a zone at the end of its map list. 14523b1a94c8SDamien Le Moal */ 14533b1a94c8SDamien Le Moal static void __dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 14543b1a94c8SDamien Le Moal { 14553b1a94c8SDamien Le Moal if (list_empty(&zone->link)) 14563b1a94c8SDamien Le Moal return; 14573b1a94c8SDamien Le Moal 14583b1a94c8SDamien Le Moal list_del_init(&zone->link); 14593b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) { 14603b1a94c8SDamien Le Moal /* LRU rotate sequential zone */ 14613b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_seq_list); 14623b1a94c8SDamien Le Moal } else { 14633b1a94c8SDamien Le Moal /* LRU rotate random zone */ 14643b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->map_rnd_list); 14653b1a94c8SDamien Le Moal } 14663b1a94c8SDamien Le Moal } 14673b1a94c8SDamien Le Moal 14683b1a94c8SDamien Le Moal /* 14693b1a94c8SDamien Le Moal * The list of mapped random zones is maintained 14703b1a94c8SDamien Le Moal * in LRU order. This rotates a zone at the end of the list. 14713b1a94c8SDamien Le Moal */ 14723b1a94c8SDamien Le Moal static void dmz_lru_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 14733b1a94c8SDamien Le Moal { 14743b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone); 14753b1a94c8SDamien Le Moal if (zone->bzone) 14763b1a94c8SDamien Le Moal __dmz_lru_zone(zmd, zone->bzone); 14773b1a94c8SDamien Le Moal } 14783b1a94c8SDamien Le Moal 14793b1a94c8SDamien Le Moal /* 14803b1a94c8SDamien Le Moal * Wait for any zone to be freed. 14813b1a94c8SDamien Le Moal */ 14823b1a94c8SDamien Le Moal static void dmz_wait_for_free_zones(struct dmz_metadata *zmd) 14833b1a94c8SDamien Le Moal { 14843b1a94c8SDamien Le Moal DEFINE_WAIT(wait); 14853b1a94c8SDamien Le Moal 14863b1a94c8SDamien Le Moal prepare_to_wait(&zmd->free_wq, &wait, TASK_UNINTERRUPTIBLE); 14873b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 14883b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 14893b1a94c8SDamien Le Moal 14903b1a94c8SDamien Le Moal io_schedule_timeout(HZ); 14913b1a94c8SDamien Le Moal 14923b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 14933b1a94c8SDamien Le Moal dmz_lock_map(zmd); 14943b1a94c8SDamien Le Moal finish_wait(&zmd->free_wq, &wait); 14953b1a94c8SDamien Le Moal } 14963b1a94c8SDamien Le Moal 14973b1a94c8SDamien Le Moal /* 14983b1a94c8SDamien Le Moal * Lock a zone for reclaim (set the zone RECLAIM bit). 14993b1a94c8SDamien Le Moal * Returns false if the zone cannot be locked or if it is already locked 15003b1a94c8SDamien Le Moal * and 1 otherwise. 15013b1a94c8SDamien Le Moal */ 15023b1a94c8SDamien Le Moal int dmz_lock_zone_reclaim(struct dm_zone *zone) 15033b1a94c8SDamien Le Moal { 15043b1a94c8SDamien Le Moal /* Active zones cannot be reclaimed */ 15053b1a94c8SDamien Le Moal if (dmz_is_active(zone)) 15063b1a94c8SDamien Le Moal return 0; 15073b1a94c8SDamien Le Moal 15083b1a94c8SDamien Le Moal return !test_and_set_bit(DMZ_RECLAIM, &zone->flags); 15093b1a94c8SDamien Le Moal } 15103b1a94c8SDamien Le Moal 15113b1a94c8SDamien Le Moal /* 15123b1a94c8SDamien Le Moal * Clear a zone reclaim flag. 15133b1a94c8SDamien Le Moal */ 15143b1a94c8SDamien Le Moal void dmz_unlock_zone_reclaim(struct dm_zone *zone) 15153b1a94c8SDamien Le Moal { 15163b1a94c8SDamien Le Moal WARN_ON(dmz_is_active(zone)); 15173b1a94c8SDamien Le Moal WARN_ON(!dmz_in_reclaim(zone)); 15183b1a94c8SDamien Le Moal 15193b1a94c8SDamien Le Moal clear_bit_unlock(DMZ_RECLAIM, &zone->flags); 15203b1a94c8SDamien Le Moal smp_mb__after_atomic(); 15213b1a94c8SDamien Le Moal wake_up_bit(&zone->flags, DMZ_RECLAIM); 15223b1a94c8SDamien Le Moal } 15233b1a94c8SDamien Le Moal 15243b1a94c8SDamien Le Moal /* 15253b1a94c8SDamien Le Moal * Wait for a zone reclaim to complete. 15263b1a94c8SDamien Le Moal */ 15273b1a94c8SDamien Le Moal static void dmz_wait_for_reclaim(struct dmz_metadata *zmd, struct dm_zone *zone) 15283b1a94c8SDamien Le Moal { 15293b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 15303b1a94c8SDamien Le Moal dmz_unlock_metadata(zmd); 15313b1a94c8SDamien Le Moal wait_on_bit_timeout(&zone->flags, DMZ_RECLAIM, TASK_UNINTERRUPTIBLE, HZ); 15323b1a94c8SDamien Le Moal dmz_lock_metadata(zmd); 15333b1a94c8SDamien Le Moal dmz_lock_map(zmd); 15343b1a94c8SDamien Le Moal } 15353b1a94c8SDamien Le Moal 15363b1a94c8SDamien Le Moal /* 15373b1a94c8SDamien Le Moal * Select a random write zone for reclaim. 15383b1a94c8SDamien Le Moal */ 15393b1a94c8SDamien Le Moal static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd) 15403b1a94c8SDamien Le Moal { 15413b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 15423b1a94c8SDamien Le Moal struct dm_zone *zone; 15433b1a94c8SDamien Le Moal 15443b1a94c8SDamien Le Moal if (list_empty(&zmd->map_rnd_list)) 15453b1a94c8SDamien Le Moal return NULL; 15463b1a94c8SDamien Le Moal 15473b1a94c8SDamien Le Moal list_for_each_entry(zone, &zmd->map_rnd_list, link) { 15483b1a94c8SDamien Le Moal if (dmz_is_buf(zone)) 15493b1a94c8SDamien Le Moal dzone = zone->bzone; 15503b1a94c8SDamien Le Moal else 15513b1a94c8SDamien Le Moal dzone = zone; 15523b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(dzone)) 15533b1a94c8SDamien Le Moal return dzone; 15543b1a94c8SDamien Le Moal } 15553b1a94c8SDamien Le Moal 15563b1a94c8SDamien Le Moal return NULL; 15573b1a94c8SDamien Le Moal } 15583b1a94c8SDamien Le Moal 15593b1a94c8SDamien Le Moal /* 15603b1a94c8SDamien Le Moal * Select a buffered sequential zone for reclaim. 15613b1a94c8SDamien Le Moal */ 15623b1a94c8SDamien Le Moal static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) 15633b1a94c8SDamien Le Moal { 15643b1a94c8SDamien Le Moal struct dm_zone *zone; 15653b1a94c8SDamien Le Moal 15663b1a94c8SDamien Le Moal if (list_empty(&zmd->map_seq_list)) 15673b1a94c8SDamien Le Moal return NULL; 15683b1a94c8SDamien Le Moal 15693b1a94c8SDamien Le Moal list_for_each_entry(zone, &zmd->map_seq_list, link) { 15703b1a94c8SDamien Le Moal if (!zone->bzone) 15713b1a94c8SDamien Le Moal continue; 15723b1a94c8SDamien Le Moal if (dmz_lock_zone_reclaim(zone)) 15733b1a94c8SDamien Le Moal return zone; 15743b1a94c8SDamien Le Moal } 15753b1a94c8SDamien Le Moal 15763b1a94c8SDamien Le Moal return NULL; 15773b1a94c8SDamien Le Moal } 15783b1a94c8SDamien Le Moal 15793b1a94c8SDamien Le Moal /* 15803b1a94c8SDamien Le Moal * Select a zone for reclaim. 15813b1a94c8SDamien Le Moal */ 15823b1a94c8SDamien Le Moal struct dm_zone *dmz_get_zone_for_reclaim(struct dmz_metadata *zmd) 15833b1a94c8SDamien Le Moal { 15843b1a94c8SDamien Le Moal struct dm_zone *zone; 15853b1a94c8SDamien Le Moal 15863b1a94c8SDamien Le Moal /* 15873b1a94c8SDamien Le Moal * Search for a zone candidate to reclaim: 2 cases are possible. 15883b1a94c8SDamien Le Moal * (1) There is no free sequential zones. Then a random data zone 15893b1a94c8SDamien Le Moal * cannot be reclaimed. So choose a sequential zone to reclaim so 15903b1a94c8SDamien Le Moal * that afterward a random zone can be reclaimed. 15913b1a94c8SDamien Le Moal * (2) At least one free sequential zone is available, then choose 15923b1a94c8SDamien Le Moal * the oldest random zone (data or buffer) that can be locked. 15933b1a94c8SDamien Le Moal */ 15943b1a94c8SDamien Le Moal dmz_lock_map(zmd); 15953b1a94c8SDamien Le Moal if (list_empty(&zmd->reserved_seq_zones_list)) 15963b1a94c8SDamien Le Moal zone = dmz_get_seq_zone_for_reclaim(zmd); 15973b1a94c8SDamien Le Moal else 15983b1a94c8SDamien Le Moal zone = dmz_get_rnd_zone_for_reclaim(zmd); 15993b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 16003b1a94c8SDamien Le Moal 16013b1a94c8SDamien Le Moal return zone; 16023b1a94c8SDamien Le Moal } 16033b1a94c8SDamien Le Moal 16043b1a94c8SDamien Le Moal /* 16053b1a94c8SDamien Le Moal * Activate a zone (increment its reference count). 16063b1a94c8SDamien Le Moal */ 16073b1a94c8SDamien Le Moal void dmz_activate_zone(struct dm_zone *zone) 16083b1a94c8SDamien Le Moal { 16093b1a94c8SDamien Le Moal set_bit(DMZ_ACTIVE, &zone->flags); 16103b1a94c8SDamien Le Moal atomic_inc(&zone->refcount); 16113b1a94c8SDamien Le Moal } 16123b1a94c8SDamien Le Moal 16133b1a94c8SDamien Le Moal /* 16143b1a94c8SDamien Le Moal * Deactivate a zone. This decrement the zone reference counter 16153b1a94c8SDamien Le Moal * and clears the active state of the zone once the count reaches 0, 16163b1a94c8SDamien Le Moal * indicating that all BIOs to the zone have completed. Returns 16173b1a94c8SDamien Le Moal * true if the zone was deactivated. 16183b1a94c8SDamien Le Moal */ 16193b1a94c8SDamien Le Moal void dmz_deactivate_zone(struct dm_zone *zone) 16203b1a94c8SDamien Le Moal { 16213b1a94c8SDamien Le Moal if (atomic_dec_and_test(&zone->refcount)) { 16223b1a94c8SDamien Le Moal WARN_ON(!test_bit(DMZ_ACTIVE, &zone->flags)); 16233b1a94c8SDamien Le Moal clear_bit_unlock(DMZ_ACTIVE, &zone->flags); 16243b1a94c8SDamien Le Moal smp_mb__after_atomic(); 16253b1a94c8SDamien Le Moal } 16263b1a94c8SDamien Le Moal } 16273b1a94c8SDamien Le Moal 16283b1a94c8SDamien Le Moal /* 16293b1a94c8SDamien Le Moal * Get the zone mapping a chunk, if the chunk is mapped already. 16303b1a94c8SDamien Le Moal * If no mapping exist and the operation is WRITE, a zone is 16313b1a94c8SDamien Le Moal * allocated and used to map the chunk. 16323b1a94c8SDamien Le Moal * The zone returned will be set to the active state. 16333b1a94c8SDamien Le Moal */ 16343b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chunk, int op) 16353b1a94c8SDamien Le Moal { 16363b1a94c8SDamien Le Moal struct dmz_mblock *dmap_mblk = zmd->map_mblk[chunk >> DMZ_MAP_ENTRIES_SHIFT]; 16373b1a94c8SDamien Le Moal struct dmz_map *dmap = (struct dmz_map *) dmap_mblk->data; 16383b1a94c8SDamien Le Moal int dmap_idx = chunk & DMZ_MAP_ENTRIES_MASK; 16393b1a94c8SDamien Le Moal unsigned int dzone_id; 16403b1a94c8SDamien Le Moal struct dm_zone *dzone = NULL; 16413b1a94c8SDamien Le Moal int ret = 0; 16423b1a94c8SDamien Le Moal 16433b1a94c8SDamien Le Moal dmz_lock_map(zmd); 16443b1a94c8SDamien Le Moal again: 16453b1a94c8SDamien Le Moal /* Get the chunk mapping */ 16463b1a94c8SDamien Le Moal dzone_id = le32_to_cpu(dmap[dmap_idx].dzone_id); 16473b1a94c8SDamien Le Moal if (dzone_id == DMZ_MAP_UNMAPPED) { 16483b1a94c8SDamien Le Moal /* 16493b1a94c8SDamien Le Moal * Read or discard in unmapped chunks are fine. But for 16503b1a94c8SDamien Le Moal * writes, we need a mapping, so get one. 16513b1a94c8SDamien Le Moal */ 16523b1a94c8SDamien Le Moal if (op != REQ_OP_WRITE) 16533b1a94c8SDamien Le Moal goto out; 16543b1a94c8SDamien Le Moal 16553b1a94c8SDamien Le Moal /* Alloate a random zone */ 16563b1a94c8SDamien Le Moal dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); 16573b1a94c8SDamien Le Moal if (!dzone) { 16583b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 16593b1a94c8SDamien Le Moal goto again; 16603b1a94c8SDamien Le Moal } 16613b1a94c8SDamien Le Moal 16623b1a94c8SDamien Le Moal dmz_map_zone(zmd, dzone, chunk); 16633b1a94c8SDamien Le Moal 16643b1a94c8SDamien Le Moal } else { 16653b1a94c8SDamien Le Moal /* The chunk is already mapped: get the mapping zone */ 16663b1a94c8SDamien Le Moal dzone = dmz_get(zmd, dzone_id); 16673b1a94c8SDamien Le Moal if (dzone->chunk != chunk) { 16683b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 16693b1a94c8SDamien Le Moal goto out; 16703b1a94c8SDamien Le Moal } 16713b1a94c8SDamien Le Moal 16723b1a94c8SDamien Le Moal /* Repair write pointer if the sequential dzone has error */ 16733b1a94c8SDamien Le Moal if (dmz_seq_write_err(dzone)) { 16743b1a94c8SDamien Le Moal ret = dmz_handle_seq_write_err(zmd, dzone); 16753b1a94c8SDamien Le Moal if (ret) { 16763b1a94c8SDamien Le Moal dzone = ERR_PTR(-EIO); 16773b1a94c8SDamien Le Moal goto out; 16783b1a94c8SDamien Le Moal } 16793b1a94c8SDamien Le Moal clear_bit(DMZ_SEQ_WRITE_ERR, &dzone->flags); 16803b1a94c8SDamien Le Moal } 16813b1a94c8SDamien Le Moal } 16823b1a94c8SDamien Le Moal 16833b1a94c8SDamien Le Moal /* 16843b1a94c8SDamien Le Moal * If the zone is being reclaimed, the chunk mapping may change 16853b1a94c8SDamien Le Moal * to a different zone. So wait for reclaim and retry. Otherwise, 16863b1a94c8SDamien Le Moal * activate the zone (this will prevent reclaim from touching it). 16873b1a94c8SDamien Le Moal */ 16883b1a94c8SDamien Le Moal if (dmz_in_reclaim(dzone)) { 16893b1a94c8SDamien Le Moal dmz_wait_for_reclaim(zmd, dzone); 16903b1a94c8SDamien Le Moal goto again; 16913b1a94c8SDamien Le Moal } 16923b1a94c8SDamien Le Moal dmz_activate_zone(dzone); 16933b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 16943b1a94c8SDamien Le Moal out: 16953b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 16963b1a94c8SDamien Le Moal 16973b1a94c8SDamien Le Moal return dzone; 16983b1a94c8SDamien Le Moal } 16993b1a94c8SDamien Le Moal 17003b1a94c8SDamien Le Moal /* 17013b1a94c8SDamien Le Moal * Write and discard change the block validity of data zones and their buffer 17023b1a94c8SDamien Le Moal * zones. Check here that valid blocks are still present. If all blocks are 17033b1a94c8SDamien Le Moal * invalid, the zones can be unmapped on the fly without waiting for reclaim 17043b1a94c8SDamien Le Moal * to do it. 17053b1a94c8SDamien Le Moal */ 17063b1a94c8SDamien Le Moal void dmz_put_chunk_mapping(struct dmz_metadata *zmd, struct dm_zone *dzone) 17073b1a94c8SDamien Le Moal { 17083b1a94c8SDamien Le Moal struct dm_zone *bzone; 17093b1a94c8SDamien Le Moal 17103b1a94c8SDamien Le Moal dmz_lock_map(zmd); 17113b1a94c8SDamien Le Moal 17123b1a94c8SDamien Le Moal bzone = dzone->bzone; 17133b1a94c8SDamien Le Moal if (bzone) { 17143b1a94c8SDamien Le Moal if (dmz_weight(bzone)) 17153b1a94c8SDamien Le Moal dmz_lru_zone(zmd, bzone); 17163b1a94c8SDamien Le Moal else { 17173b1a94c8SDamien Le Moal /* Empty buffer zone: reclaim it */ 17183b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, bzone); 17193b1a94c8SDamien Le Moal dmz_free_zone(zmd, bzone); 17203b1a94c8SDamien Le Moal bzone = NULL; 17213b1a94c8SDamien Le Moal } 17223b1a94c8SDamien Le Moal } 17233b1a94c8SDamien Le Moal 17243b1a94c8SDamien Le Moal /* Deactivate the data zone */ 17253b1a94c8SDamien Le Moal dmz_deactivate_zone(dzone); 17263b1a94c8SDamien Le Moal if (dmz_is_active(dzone) || bzone || dmz_weight(dzone)) 17273b1a94c8SDamien Le Moal dmz_lru_zone(zmd, dzone); 17283b1a94c8SDamien Le Moal else { 17293b1a94c8SDamien Le Moal /* Unbuffered inactive empty data zone: reclaim it */ 17303b1a94c8SDamien Le Moal dmz_unmap_zone(zmd, dzone); 17313b1a94c8SDamien Le Moal dmz_free_zone(zmd, dzone); 17323b1a94c8SDamien Le Moal } 17333b1a94c8SDamien Le Moal 17343b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 17353b1a94c8SDamien Le Moal } 17363b1a94c8SDamien Le Moal 17373b1a94c8SDamien Le Moal /* 17383b1a94c8SDamien Le Moal * Allocate and map a random zone to buffer a chunk 17393b1a94c8SDamien Le Moal * already mapped to a sequential zone. 17403b1a94c8SDamien Le Moal */ 17413b1a94c8SDamien Le Moal struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd, 17423b1a94c8SDamien Le Moal struct dm_zone *dzone) 17433b1a94c8SDamien Le Moal { 17443b1a94c8SDamien Le Moal struct dm_zone *bzone; 17453b1a94c8SDamien Le Moal 17463b1a94c8SDamien Le Moal dmz_lock_map(zmd); 17473b1a94c8SDamien Le Moal again: 17483b1a94c8SDamien Le Moal bzone = dzone->bzone; 17493b1a94c8SDamien Le Moal if (bzone) 17503b1a94c8SDamien Le Moal goto out; 17513b1a94c8SDamien Le Moal 17523b1a94c8SDamien Le Moal /* Alloate a random zone */ 17533b1a94c8SDamien Le Moal bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND); 17543b1a94c8SDamien Le Moal if (!bzone) { 17553b1a94c8SDamien Le Moal dmz_wait_for_free_zones(zmd); 17563b1a94c8SDamien Le Moal goto again; 17573b1a94c8SDamien Le Moal } 17583b1a94c8SDamien Le Moal 17593b1a94c8SDamien Le Moal /* Update the chunk mapping */ 17603b1a94c8SDamien Le Moal dmz_set_chunk_mapping(zmd, dzone->chunk, dmz_id(zmd, dzone), 17613b1a94c8SDamien Le Moal dmz_id(zmd, bzone)); 17623b1a94c8SDamien Le Moal 17633b1a94c8SDamien Le Moal set_bit(DMZ_BUF, &bzone->flags); 17643b1a94c8SDamien Le Moal bzone->chunk = dzone->chunk; 17653b1a94c8SDamien Le Moal bzone->bzone = dzone; 17663b1a94c8SDamien Le Moal dzone->bzone = bzone; 17673b1a94c8SDamien Le Moal list_add_tail(&bzone->link, &zmd->map_rnd_list); 17683b1a94c8SDamien Le Moal out: 17693b1a94c8SDamien Le Moal dmz_unlock_map(zmd); 17703b1a94c8SDamien Le Moal 17713b1a94c8SDamien Le Moal return bzone; 17723b1a94c8SDamien Le Moal } 17733b1a94c8SDamien Le Moal 17743b1a94c8SDamien Le Moal /* 17753b1a94c8SDamien Le Moal * Get an unmapped (free) zone. 17763b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 17773b1a94c8SDamien Le Moal */ 17783b1a94c8SDamien Le Moal struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags) 17793b1a94c8SDamien Le Moal { 17803b1a94c8SDamien Le Moal struct list_head *list; 17813b1a94c8SDamien Le Moal struct dm_zone *zone; 17823b1a94c8SDamien Le Moal 17833b1a94c8SDamien Le Moal if (flags & DMZ_ALLOC_RND) 17843b1a94c8SDamien Le Moal list = &zmd->unmap_rnd_list; 17853b1a94c8SDamien Le Moal else 17863b1a94c8SDamien Le Moal list = &zmd->unmap_seq_list; 17873b1a94c8SDamien Le Moal again: 17883b1a94c8SDamien Le Moal if (list_empty(list)) { 17893b1a94c8SDamien Le Moal /* 17903b1a94c8SDamien Le Moal * No free zone: if this is for reclaim, allow using the 17913b1a94c8SDamien Le Moal * reserved sequential zones. 17923b1a94c8SDamien Le Moal */ 17933b1a94c8SDamien Le Moal if (!(flags & DMZ_ALLOC_RECLAIM) || 17943b1a94c8SDamien Le Moal list_empty(&zmd->reserved_seq_zones_list)) 17953b1a94c8SDamien Le Moal return NULL; 17963b1a94c8SDamien Le Moal 17973b1a94c8SDamien Le Moal zone = list_first_entry(&zmd->reserved_seq_zones_list, 17983b1a94c8SDamien Le Moal struct dm_zone, link); 17993b1a94c8SDamien Le Moal list_del_init(&zone->link); 18003b1a94c8SDamien Le Moal atomic_dec(&zmd->nr_reserved_seq_zones); 18013b1a94c8SDamien Le Moal return zone; 18023b1a94c8SDamien Le Moal } 18033b1a94c8SDamien Le Moal 18043b1a94c8SDamien Le Moal zone = list_first_entry(list, struct dm_zone, link); 18053b1a94c8SDamien Le Moal list_del_init(&zone->link); 18063b1a94c8SDamien Le Moal 18073b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) 18083b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_rnd); 18093b1a94c8SDamien Le Moal else 18103b1a94c8SDamien Le Moal atomic_dec(&zmd->unmap_nr_seq); 18113b1a94c8SDamien Le Moal 18123b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 18133b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "Zone %u is offline", dmz_id(zmd, zone)); 18143b1a94c8SDamien Le Moal zone = NULL; 18153b1a94c8SDamien Le Moal goto again; 18163b1a94c8SDamien Le Moal } 18173b1a94c8SDamien Le Moal 18183b1a94c8SDamien Le Moal return zone; 18193b1a94c8SDamien Le Moal } 18203b1a94c8SDamien Le Moal 18213b1a94c8SDamien Le Moal /* 18223b1a94c8SDamien Le Moal * Free a zone. 18233b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 18243b1a94c8SDamien Le Moal */ 18253b1a94c8SDamien Le Moal void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 18263b1a94c8SDamien Le Moal { 18273b1a94c8SDamien Le Moal /* If this is a sequential zone, reset it */ 18283b1a94c8SDamien Le Moal if (dmz_is_seq(zone)) 18293b1a94c8SDamien Le Moal dmz_reset_zone(zmd, zone); 18303b1a94c8SDamien Le Moal 18313b1a94c8SDamien Le Moal /* Return the zone to its type unmap list */ 18323b1a94c8SDamien Le Moal if (dmz_is_rnd(zone)) { 18333b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_rnd_list); 18343b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_rnd); 18353b1a94c8SDamien Le Moal } else if (atomic_read(&zmd->nr_reserved_seq_zones) < 18363b1a94c8SDamien Le Moal zmd->nr_reserved_seq) { 18373b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->reserved_seq_zones_list); 18383b1a94c8SDamien Le Moal atomic_inc(&zmd->nr_reserved_seq_zones); 18393b1a94c8SDamien Le Moal } else { 18403b1a94c8SDamien Le Moal list_add_tail(&zone->link, &zmd->unmap_seq_list); 18413b1a94c8SDamien Le Moal atomic_inc(&zmd->unmap_nr_seq); 18423b1a94c8SDamien Le Moal } 18433b1a94c8SDamien Le Moal 18443b1a94c8SDamien Le Moal wake_up_all(&zmd->free_wq); 18453b1a94c8SDamien Le Moal } 18463b1a94c8SDamien Le Moal 18473b1a94c8SDamien Le Moal /* 18483b1a94c8SDamien Le Moal * Map a chunk to a zone. 18493b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 18503b1a94c8SDamien Le Moal */ 18513b1a94c8SDamien Le Moal void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone, 18523b1a94c8SDamien Le Moal unsigned int chunk) 18533b1a94c8SDamien Le Moal { 18543b1a94c8SDamien Le Moal /* Set the chunk mapping */ 18553b1a94c8SDamien Le Moal dmz_set_chunk_mapping(zmd, chunk, dmz_id(zmd, dzone), 18563b1a94c8SDamien Le Moal DMZ_MAP_UNMAPPED); 18573b1a94c8SDamien Le Moal dzone->chunk = chunk; 18583b1a94c8SDamien Le Moal if (dmz_is_rnd(dzone)) 18593b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_rnd_list); 18603b1a94c8SDamien Le Moal else 18613b1a94c8SDamien Le Moal list_add_tail(&dzone->link, &zmd->map_seq_list); 18623b1a94c8SDamien Le Moal } 18633b1a94c8SDamien Le Moal 18643b1a94c8SDamien Le Moal /* 18653b1a94c8SDamien Le Moal * Unmap a zone. 18663b1a94c8SDamien Le Moal * This must be called with the mapping lock held. 18673b1a94c8SDamien Le Moal */ 18683b1a94c8SDamien Le Moal void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone) 18693b1a94c8SDamien Le Moal { 18703b1a94c8SDamien Le Moal unsigned int chunk = zone->chunk; 18713b1a94c8SDamien Le Moal unsigned int dzone_id; 18723b1a94c8SDamien Le Moal 18733b1a94c8SDamien Le Moal if (chunk == DMZ_MAP_UNMAPPED) { 18743b1a94c8SDamien Le Moal /* Already unmapped */ 18753b1a94c8SDamien Le Moal return; 18763b1a94c8SDamien Le Moal } 18773b1a94c8SDamien Le Moal 18783b1a94c8SDamien Le Moal if (test_and_clear_bit(DMZ_BUF, &zone->flags)) { 18793b1a94c8SDamien Le Moal /* 18803b1a94c8SDamien Le Moal * Unmapping the chunk buffer zone: clear only 18813b1a94c8SDamien Le Moal * the chunk buffer mapping 18823b1a94c8SDamien Le Moal */ 18833b1a94c8SDamien Le Moal dzone_id = dmz_id(zmd, zone->bzone); 18843b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 18853b1a94c8SDamien Le Moal zone->bzone = NULL; 18863b1a94c8SDamien Le Moal 18873b1a94c8SDamien Le Moal } else { 18883b1a94c8SDamien Le Moal /* 18893b1a94c8SDamien Le Moal * Unmapping the chunk data zone: the zone must 18903b1a94c8SDamien Le Moal * not be buffered. 18913b1a94c8SDamien Le Moal */ 18923b1a94c8SDamien Le Moal if (WARN_ON(zone->bzone)) { 18933b1a94c8SDamien Le Moal zone->bzone->bzone = NULL; 18943b1a94c8SDamien Le Moal zone->bzone = NULL; 18953b1a94c8SDamien Le Moal } 18963b1a94c8SDamien Le Moal dzone_id = DMZ_MAP_UNMAPPED; 18973b1a94c8SDamien Le Moal } 18983b1a94c8SDamien Le Moal 18993b1a94c8SDamien Le Moal dmz_set_chunk_mapping(zmd, chunk, dzone_id, DMZ_MAP_UNMAPPED); 19003b1a94c8SDamien Le Moal 19013b1a94c8SDamien Le Moal zone->chunk = DMZ_MAP_UNMAPPED; 19023b1a94c8SDamien Le Moal list_del_init(&zone->link); 19033b1a94c8SDamien Le Moal } 19043b1a94c8SDamien Le Moal 19053b1a94c8SDamien Le Moal /* 19063b1a94c8SDamien Le Moal * Set @nr_bits bits in @bitmap starting from @bit. 19073b1a94c8SDamien Le Moal * Return the number of bits changed from 0 to 1. 19083b1a94c8SDamien Le Moal */ 19093b1a94c8SDamien Le Moal static unsigned int dmz_set_bits(unsigned long *bitmap, 19103b1a94c8SDamien Le Moal unsigned int bit, unsigned int nr_bits) 19113b1a94c8SDamien Le Moal { 19123b1a94c8SDamien Le Moal unsigned long *addr; 19133b1a94c8SDamien Le Moal unsigned int end = bit + nr_bits; 19143b1a94c8SDamien Le Moal unsigned int n = 0; 19153b1a94c8SDamien Le Moal 19163b1a94c8SDamien Le Moal while (bit < end) { 19173b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 19183b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 19193b1a94c8SDamien Le Moal /* Try to set the whole word at once */ 19203b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 19213b1a94c8SDamien Le Moal if (*addr == 0) { 19223b1a94c8SDamien Le Moal *addr = ULONG_MAX; 19233b1a94c8SDamien Le Moal n += BITS_PER_LONG; 19243b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 19253b1a94c8SDamien Le Moal continue; 19263b1a94c8SDamien Le Moal } 19273b1a94c8SDamien Le Moal } 19283b1a94c8SDamien Le Moal 19293b1a94c8SDamien Le Moal if (!test_and_set_bit(bit, bitmap)) 19303b1a94c8SDamien Le Moal n++; 19313b1a94c8SDamien Le Moal bit++; 19323b1a94c8SDamien Le Moal } 19333b1a94c8SDamien Le Moal 19343b1a94c8SDamien Le Moal return n; 19353b1a94c8SDamien Le Moal } 19363b1a94c8SDamien Le Moal 19373b1a94c8SDamien Le Moal /* 19383b1a94c8SDamien Le Moal * Get the bitmap block storing the bit for chunk_block in zone. 19393b1a94c8SDamien Le Moal */ 19403b1a94c8SDamien Le Moal static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd, 19413b1a94c8SDamien Le Moal struct dm_zone *zone, 19423b1a94c8SDamien Le Moal sector_t chunk_block) 19433b1a94c8SDamien Le Moal { 19443b1a94c8SDamien Le Moal sector_t bitmap_block = 1 + zmd->nr_map_blocks + 19453b1a94c8SDamien Le Moal (sector_t)(dmz_id(zmd, zone) * zmd->zone_nr_bitmap_blocks) + 19463b1a94c8SDamien Le Moal (chunk_block >> DMZ_BLOCK_SHIFT_BITS); 19473b1a94c8SDamien Le Moal 19483b1a94c8SDamien Le Moal return dmz_get_mblock(zmd, bitmap_block); 19493b1a94c8SDamien Le Moal } 19503b1a94c8SDamien Le Moal 19513b1a94c8SDamien Le Moal /* 19523b1a94c8SDamien Le Moal * Copy the valid blocks bitmap of from_zone to the bitmap of to_zone. 19533b1a94c8SDamien Le Moal */ 19543b1a94c8SDamien Le Moal int dmz_copy_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 19553b1a94c8SDamien Le Moal struct dm_zone *to_zone) 19563b1a94c8SDamien Le Moal { 19573b1a94c8SDamien Le Moal struct dmz_mblock *from_mblk, *to_mblk; 19583b1a94c8SDamien Le Moal sector_t chunk_block = 0; 19593b1a94c8SDamien Le Moal 19603b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 19613b1a94c8SDamien Le Moal while (chunk_block < zmd->dev->zone_nr_blocks) { 19623b1a94c8SDamien Le Moal from_mblk = dmz_get_bitmap(zmd, from_zone, chunk_block); 19633b1a94c8SDamien Le Moal if (IS_ERR(from_mblk)) 19643b1a94c8SDamien Le Moal return PTR_ERR(from_mblk); 19653b1a94c8SDamien Le Moal to_mblk = dmz_get_bitmap(zmd, to_zone, chunk_block); 19663b1a94c8SDamien Le Moal if (IS_ERR(to_mblk)) { 19673b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 19683b1a94c8SDamien Le Moal return PTR_ERR(to_mblk); 19693b1a94c8SDamien Le Moal } 19703b1a94c8SDamien Le Moal 19713b1a94c8SDamien Le Moal memcpy(to_mblk->data, from_mblk->data, DMZ_BLOCK_SIZE); 19723b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, to_mblk); 19733b1a94c8SDamien Le Moal 19743b1a94c8SDamien Le Moal dmz_release_mblock(zmd, to_mblk); 19753b1a94c8SDamien Le Moal dmz_release_mblock(zmd, from_mblk); 19763b1a94c8SDamien Le Moal 19773b1a94c8SDamien Le Moal chunk_block += DMZ_BLOCK_SIZE_BITS; 19783b1a94c8SDamien Le Moal } 19793b1a94c8SDamien Le Moal 19803b1a94c8SDamien Le Moal to_zone->weight = from_zone->weight; 19813b1a94c8SDamien Le Moal 19823b1a94c8SDamien Le Moal return 0; 19833b1a94c8SDamien Le Moal } 19843b1a94c8SDamien Le Moal 19853b1a94c8SDamien Le Moal /* 19863b1a94c8SDamien Le Moal * Merge the valid blocks bitmap of from_zone into the bitmap of to_zone, 19873b1a94c8SDamien Le Moal * starting from chunk_block. 19883b1a94c8SDamien Le Moal */ 19893b1a94c8SDamien Le Moal int dmz_merge_valid_blocks(struct dmz_metadata *zmd, struct dm_zone *from_zone, 19903b1a94c8SDamien Le Moal struct dm_zone *to_zone, sector_t chunk_block) 19913b1a94c8SDamien Le Moal { 19923b1a94c8SDamien Le Moal unsigned int nr_blocks; 19933b1a94c8SDamien Le Moal int ret; 19943b1a94c8SDamien Le Moal 19953b1a94c8SDamien Le Moal /* Get the zones bitmap blocks */ 19963b1a94c8SDamien Le Moal while (chunk_block < zmd->dev->zone_nr_blocks) { 19973b1a94c8SDamien Le Moal /* Get a valid region from the source zone */ 19983b1a94c8SDamien Le Moal ret = dmz_first_valid_block(zmd, from_zone, &chunk_block); 19993b1a94c8SDamien Le Moal if (ret <= 0) 20003b1a94c8SDamien Le Moal return ret; 20013b1a94c8SDamien Le Moal 20023b1a94c8SDamien Le Moal nr_blocks = ret; 20033b1a94c8SDamien Le Moal ret = dmz_validate_blocks(zmd, to_zone, chunk_block, nr_blocks); 20043b1a94c8SDamien Le Moal if (ret) 20053b1a94c8SDamien Le Moal return ret; 20063b1a94c8SDamien Le Moal 20073b1a94c8SDamien Le Moal chunk_block += nr_blocks; 20083b1a94c8SDamien Le Moal } 20093b1a94c8SDamien Le Moal 20103b1a94c8SDamien Le Moal return 0; 20113b1a94c8SDamien Le Moal } 20123b1a94c8SDamien Le Moal 20133b1a94c8SDamien Le Moal /* 20143b1a94c8SDamien Le Moal * Validate all the blocks in the range [block..block+nr_blocks-1]. 20153b1a94c8SDamien Le Moal */ 20163b1a94c8SDamien Le Moal int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 20173b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 20183b1a94c8SDamien Le Moal { 20193b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 20203b1a94c8SDamien Le Moal unsigned int zone_nr_blocks = zmd->dev->zone_nr_blocks; 20213b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 20223b1a94c8SDamien Le Moal unsigned int n = 0; 20233b1a94c8SDamien Le Moal 20243b1a94c8SDamien Le Moal dmz_dev_debug(zmd->dev, "=> VALIDATE zone %u, block %llu, %u blocks", 20253b1a94c8SDamien Le Moal dmz_id(zmd, zone), (unsigned long long)chunk_block, 20263b1a94c8SDamien Le Moal nr_blocks); 20273b1a94c8SDamien Le Moal 20283b1a94c8SDamien Le Moal WARN_ON(chunk_block + nr_blocks > zone_nr_blocks); 20293b1a94c8SDamien Le Moal 20303b1a94c8SDamien Le Moal while (nr_blocks) { 20313b1a94c8SDamien Le Moal /* Get bitmap block */ 20323b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 20333b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 20343b1a94c8SDamien Le Moal return PTR_ERR(mblk); 20353b1a94c8SDamien Le Moal 20363b1a94c8SDamien Le Moal /* Set bits */ 20373b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 20383b1a94c8SDamien Le Moal nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); 20393b1a94c8SDamien Le Moal 20403b1a94c8SDamien Le Moal count = dmz_set_bits((unsigned long *)mblk->data, bit, nr_bits); 20413b1a94c8SDamien Le Moal if (count) { 20423b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 20433b1a94c8SDamien Le Moal n += count; 20443b1a94c8SDamien Le Moal } 20453b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 20463b1a94c8SDamien Le Moal 20473b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 20483b1a94c8SDamien Le Moal chunk_block += nr_bits; 20493b1a94c8SDamien Le Moal } 20503b1a94c8SDamien Le Moal 20513b1a94c8SDamien Le Moal if (likely(zone->weight + n <= zone_nr_blocks)) 20523b1a94c8SDamien Le Moal zone->weight += n; 20533b1a94c8SDamien Le Moal else { 20543b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be <= %u", 20553b1a94c8SDamien Le Moal dmz_id(zmd, zone), zone->weight, 20563b1a94c8SDamien Le Moal zone_nr_blocks - n); 20573b1a94c8SDamien Le Moal zone->weight = zone_nr_blocks; 20583b1a94c8SDamien Le Moal } 20593b1a94c8SDamien Le Moal 20603b1a94c8SDamien Le Moal return 0; 20613b1a94c8SDamien Le Moal } 20623b1a94c8SDamien Le Moal 20633b1a94c8SDamien Le Moal /* 20643b1a94c8SDamien Le Moal * Clear nr_bits bits in bitmap starting from bit. 20653b1a94c8SDamien Le Moal * Return the number of bits cleared. 20663b1a94c8SDamien Le Moal */ 20673b1a94c8SDamien Le Moal static int dmz_clear_bits(unsigned long *bitmap, int bit, int nr_bits) 20683b1a94c8SDamien Le Moal { 20693b1a94c8SDamien Le Moal unsigned long *addr; 20703b1a94c8SDamien Le Moal int end = bit + nr_bits; 20713b1a94c8SDamien Le Moal int n = 0; 20723b1a94c8SDamien Le Moal 20733b1a94c8SDamien Le Moal while (bit < end) { 20743b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 20753b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 20763b1a94c8SDamien Le Moal /* Try to clear whole word at once */ 20773b1a94c8SDamien Le Moal addr = bitmap + BIT_WORD(bit); 20783b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 20793b1a94c8SDamien Le Moal *addr = 0; 20803b1a94c8SDamien Le Moal n += BITS_PER_LONG; 20813b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 20823b1a94c8SDamien Le Moal continue; 20833b1a94c8SDamien Le Moal } 20843b1a94c8SDamien Le Moal } 20853b1a94c8SDamien Le Moal 20863b1a94c8SDamien Le Moal if (test_and_clear_bit(bit, bitmap)) 20873b1a94c8SDamien Le Moal n++; 20883b1a94c8SDamien Le Moal bit++; 20893b1a94c8SDamien Le Moal } 20903b1a94c8SDamien Le Moal 20913b1a94c8SDamien Le Moal return n; 20923b1a94c8SDamien Le Moal } 20933b1a94c8SDamien Le Moal 20943b1a94c8SDamien Le Moal /* 20953b1a94c8SDamien Le Moal * Invalidate all the blocks in the range [block..block+nr_blocks-1]. 20963b1a94c8SDamien Le Moal */ 20973b1a94c8SDamien Le Moal int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone, 20983b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks) 20993b1a94c8SDamien Le Moal { 21003b1a94c8SDamien Le Moal unsigned int count, bit, nr_bits; 21013b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 21023b1a94c8SDamien Le Moal unsigned int n = 0; 21033b1a94c8SDamien Le Moal 21043b1a94c8SDamien Le Moal dmz_dev_debug(zmd->dev, "=> INVALIDATE zone %u, block %llu, %u blocks", 21053b1a94c8SDamien Le Moal dmz_id(zmd, zone), (u64)chunk_block, nr_blocks); 21063b1a94c8SDamien Le Moal 21073b1a94c8SDamien Le Moal WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); 21083b1a94c8SDamien Le Moal 21093b1a94c8SDamien Le Moal while (nr_blocks) { 21103b1a94c8SDamien Le Moal /* Get bitmap block */ 21113b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 21123b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 21133b1a94c8SDamien Le Moal return PTR_ERR(mblk); 21143b1a94c8SDamien Le Moal 21153b1a94c8SDamien Le Moal /* Clear bits */ 21163b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 21173b1a94c8SDamien Le Moal nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); 21183b1a94c8SDamien Le Moal 21193b1a94c8SDamien Le Moal count = dmz_clear_bits((unsigned long *)mblk->data, 21203b1a94c8SDamien Le Moal bit, nr_bits); 21213b1a94c8SDamien Le Moal if (count) { 21223b1a94c8SDamien Le Moal dmz_dirty_mblock(zmd, mblk); 21233b1a94c8SDamien Le Moal n += count; 21243b1a94c8SDamien Le Moal } 21253b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 21263b1a94c8SDamien Le Moal 21273b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 21283b1a94c8SDamien Le Moal chunk_block += nr_bits; 21293b1a94c8SDamien Le Moal } 21303b1a94c8SDamien Le Moal 21313b1a94c8SDamien Le Moal if (zone->weight >= n) 21323b1a94c8SDamien Le Moal zone->weight -= n; 21333b1a94c8SDamien Le Moal else { 21343b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be >= %u", 21353b1a94c8SDamien Le Moal dmz_id(zmd, zone), zone->weight, n); 21363b1a94c8SDamien Le Moal zone->weight = 0; 21373b1a94c8SDamien Le Moal } 21383b1a94c8SDamien Le Moal 21393b1a94c8SDamien Le Moal return 0; 21403b1a94c8SDamien Le Moal } 21413b1a94c8SDamien Le Moal 21423b1a94c8SDamien Le Moal /* 21433b1a94c8SDamien Le Moal * Get a block bit value. 21443b1a94c8SDamien Le Moal */ 21453b1a94c8SDamien Le Moal static int dmz_test_block(struct dmz_metadata *zmd, struct dm_zone *zone, 21463b1a94c8SDamien Le Moal sector_t chunk_block) 21473b1a94c8SDamien Le Moal { 21483b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 21493b1a94c8SDamien Le Moal int ret; 21503b1a94c8SDamien Le Moal 21513b1a94c8SDamien Le Moal WARN_ON(chunk_block >= zmd->dev->zone_nr_blocks); 21523b1a94c8SDamien Le Moal 21533b1a94c8SDamien Le Moal /* Get bitmap block */ 21543b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 21553b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 21563b1a94c8SDamien Le Moal return PTR_ERR(mblk); 21573b1a94c8SDamien Le Moal 21583b1a94c8SDamien Le Moal /* Get offset */ 21593b1a94c8SDamien Le Moal ret = test_bit(chunk_block & DMZ_BLOCK_MASK_BITS, 21603b1a94c8SDamien Le Moal (unsigned long *) mblk->data) != 0; 21613b1a94c8SDamien Le Moal 21623b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 21633b1a94c8SDamien Le Moal 21643b1a94c8SDamien Le Moal return ret; 21653b1a94c8SDamien Le Moal } 21663b1a94c8SDamien Le Moal 21673b1a94c8SDamien Le Moal /* 21683b1a94c8SDamien Le Moal * Return the number of blocks from chunk_block to the first block with a bit 21693b1a94c8SDamien Le Moal * value specified by set. Search at most nr_blocks blocks from chunk_block. 21703b1a94c8SDamien Le Moal */ 21713b1a94c8SDamien Le Moal static int dmz_to_next_set_block(struct dmz_metadata *zmd, struct dm_zone *zone, 21723b1a94c8SDamien Le Moal sector_t chunk_block, unsigned int nr_blocks, 21733b1a94c8SDamien Le Moal int set) 21743b1a94c8SDamien Le Moal { 21753b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 21763b1a94c8SDamien Le Moal unsigned int bit, set_bit, nr_bits; 21773b1a94c8SDamien Le Moal unsigned long *bitmap; 21783b1a94c8SDamien Le Moal int n = 0; 21793b1a94c8SDamien Le Moal 21803b1a94c8SDamien Le Moal WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks); 21813b1a94c8SDamien Le Moal 21823b1a94c8SDamien Le Moal while (nr_blocks) { 21833b1a94c8SDamien Le Moal /* Get bitmap block */ 21843b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 21853b1a94c8SDamien Le Moal if (IS_ERR(mblk)) 21863b1a94c8SDamien Le Moal return PTR_ERR(mblk); 21873b1a94c8SDamien Le Moal 21883b1a94c8SDamien Le Moal /* Get offset */ 21893b1a94c8SDamien Le Moal bitmap = (unsigned long *) mblk->data; 21903b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 21913b1a94c8SDamien Le Moal nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); 21923b1a94c8SDamien Le Moal if (set) 21933b1a94c8SDamien Le Moal set_bit = find_next_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); 21943b1a94c8SDamien Le Moal else 21953b1a94c8SDamien Le Moal set_bit = find_next_zero_bit(bitmap, DMZ_BLOCK_SIZE_BITS, bit); 21963b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 21973b1a94c8SDamien Le Moal 21983b1a94c8SDamien Le Moal n += set_bit - bit; 21993b1a94c8SDamien Le Moal if (set_bit < DMZ_BLOCK_SIZE_BITS) 22003b1a94c8SDamien Le Moal break; 22013b1a94c8SDamien Le Moal 22023b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 22033b1a94c8SDamien Le Moal chunk_block += nr_bits; 22043b1a94c8SDamien Le Moal } 22053b1a94c8SDamien Le Moal 22063b1a94c8SDamien Le Moal return n; 22073b1a94c8SDamien Le Moal } 22083b1a94c8SDamien Le Moal 22093b1a94c8SDamien Le Moal /* 22103b1a94c8SDamien Le Moal * Test if chunk_block is valid. If it is, the number of consecutive 22113b1a94c8SDamien Le Moal * valid blocks from chunk_block will be returned. 22123b1a94c8SDamien Le Moal */ 22133b1a94c8SDamien Le Moal int dmz_block_valid(struct dmz_metadata *zmd, struct dm_zone *zone, 22143b1a94c8SDamien Le Moal sector_t chunk_block) 22153b1a94c8SDamien Le Moal { 22163b1a94c8SDamien Le Moal int valid; 22173b1a94c8SDamien Le Moal 22183b1a94c8SDamien Le Moal valid = dmz_test_block(zmd, zone, chunk_block); 22193b1a94c8SDamien Le Moal if (valid <= 0) 22203b1a94c8SDamien Le Moal return valid; 22213b1a94c8SDamien Le Moal 22223b1a94c8SDamien Le Moal /* The block is valid: get the number of valid blocks from block */ 22233b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, chunk_block, 22243b1a94c8SDamien Le Moal zmd->dev->zone_nr_blocks - chunk_block, 0); 22253b1a94c8SDamien Le Moal } 22263b1a94c8SDamien Le Moal 22273b1a94c8SDamien Le Moal /* 22283b1a94c8SDamien Le Moal * Find the first valid block from @chunk_block in @zone. 22293b1a94c8SDamien Le Moal * If such a block is found, its number is returned using 22303b1a94c8SDamien Le Moal * @chunk_block and the total number of valid blocks from @chunk_block 22313b1a94c8SDamien Le Moal * is returned. 22323b1a94c8SDamien Le Moal */ 22333b1a94c8SDamien Le Moal int dmz_first_valid_block(struct dmz_metadata *zmd, struct dm_zone *zone, 22343b1a94c8SDamien Le Moal sector_t *chunk_block) 22353b1a94c8SDamien Le Moal { 22363b1a94c8SDamien Le Moal sector_t start_block = *chunk_block; 22373b1a94c8SDamien Le Moal int ret; 22383b1a94c8SDamien Le Moal 22393b1a94c8SDamien Le Moal ret = dmz_to_next_set_block(zmd, zone, start_block, 22403b1a94c8SDamien Le Moal zmd->dev->zone_nr_blocks - start_block, 1); 22413b1a94c8SDamien Le Moal if (ret < 0) 22423b1a94c8SDamien Le Moal return ret; 22433b1a94c8SDamien Le Moal 22443b1a94c8SDamien Le Moal start_block += ret; 22453b1a94c8SDamien Le Moal *chunk_block = start_block; 22463b1a94c8SDamien Le Moal 22473b1a94c8SDamien Le Moal return dmz_to_next_set_block(zmd, zone, start_block, 22483b1a94c8SDamien Le Moal zmd->dev->zone_nr_blocks - start_block, 0); 22493b1a94c8SDamien Le Moal } 22503b1a94c8SDamien Le Moal 22513b1a94c8SDamien Le Moal /* 22523b1a94c8SDamien Le Moal * Count the number of bits set starting from bit up to bit + nr_bits - 1. 22533b1a94c8SDamien Le Moal */ 22543b1a94c8SDamien Le Moal static int dmz_count_bits(void *bitmap, int bit, int nr_bits) 22553b1a94c8SDamien Le Moal { 22563b1a94c8SDamien Le Moal unsigned long *addr; 22573b1a94c8SDamien Le Moal int end = bit + nr_bits; 22583b1a94c8SDamien Le Moal int n = 0; 22593b1a94c8SDamien Le Moal 22603b1a94c8SDamien Le Moal while (bit < end) { 22613b1a94c8SDamien Le Moal if (((bit & (BITS_PER_LONG - 1)) == 0) && 22623b1a94c8SDamien Le Moal ((end - bit) >= BITS_PER_LONG)) { 22633b1a94c8SDamien Le Moal addr = (unsigned long *)bitmap + BIT_WORD(bit); 22643b1a94c8SDamien Le Moal if (*addr == ULONG_MAX) { 22653b1a94c8SDamien Le Moal n += BITS_PER_LONG; 22663b1a94c8SDamien Le Moal bit += BITS_PER_LONG; 22673b1a94c8SDamien Le Moal continue; 22683b1a94c8SDamien Le Moal } 22693b1a94c8SDamien Le Moal } 22703b1a94c8SDamien Le Moal 22713b1a94c8SDamien Le Moal if (test_bit(bit, bitmap)) 22723b1a94c8SDamien Le Moal n++; 22733b1a94c8SDamien Le Moal bit++; 22743b1a94c8SDamien Le Moal } 22753b1a94c8SDamien Le Moal 22763b1a94c8SDamien Le Moal return n; 22773b1a94c8SDamien Le Moal } 22783b1a94c8SDamien Le Moal 22793b1a94c8SDamien Le Moal /* 22803b1a94c8SDamien Le Moal * Get a zone weight. 22813b1a94c8SDamien Le Moal */ 22823b1a94c8SDamien Le Moal static void dmz_get_zone_weight(struct dmz_metadata *zmd, struct dm_zone *zone) 22833b1a94c8SDamien Le Moal { 22843b1a94c8SDamien Le Moal struct dmz_mblock *mblk; 22853b1a94c8SDamien Le Moal sector_t chunk_block = 0; 22863b1a94c8SDamien Le Moal unsigned int bit, nr_bits; 22873b1a94c8SDamien Le Moal unsigned int nr_blocks = zmd->dev->zone_nr_blocks; 22883b1a94c8SDamien Le Moal void *bitmap; 22893b1a94c8SDamien Le Moal int n = 0; 22903b1a94c8SDamien Le Moal 22913b1a94c8SDamien Le Moal while (nr_blocks) { 22923b1a94c8SDamien Le Moal /* Get bitmap block */ 22933b1a94c8SDamien Le Moal mblk = dmz_get_bitmap(zmd, zone, chunk_block); 22943b1a94c8SDamien Le Moal if (IS_ERR(mblk)) { 22953b1a94c8SDamien Le Moal n = 0; 22963b1a94c8SDamien Le Moal break; 22973b1a94c8SDamien Le Moal } 22983b1a94c8SDamien Le Moal 22993b1a94c8SDamien Le Moal /* Count bits in this block */ 23003b1a94c8SDamien Le Moal bitmap = mblk->data; 23013b1a94c8SDamien Le Moal bit = chunk_block & DMZ_BLOCK_MASK_BITS; 23023b1a94c8SDamien Le Moal nr_bits = min(nr_blocks, DMZ_BLOCK_SIZE_BITS - bit); 23033b1a94c8SDamien Le Moal n += dmz_count_bits(bitmap, bit, nr_bits); 23043b1a94c8SDamien Le Moal 23053b1a94c8SDamien Le Moal dmz_release_mblock(zmd, mblk); 23063b1a94c8SDamien Le Moal 23073b1a94c8SDamien Le Moal nr_blocks -= nr_bits; 23083b1a94c8SDamien Le Moal chunk_block += nr_bits; 23093b1a94c8SDamien Le Moal } 23103b1a94c8SDamien Le Moal 23113b1a94c8SDamien Le Moal zone->weight = n; 23123b1a94c8SDamien Le Moal } 23133b1a94c8SDamien Le Moal 23143b1a94c8SDamien Le Moal /* 23153b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 23163b1a94c8SDamien Le Moal */ 23173b1a94c8SDamien Le Moal static void dmz_cleanup_metadata(struct dmz_metadata *zmd) 23183b1a94c8SDamien Le Moal { 23193b1a94c8SDamien Le Moal struct rb_root *root; 23203b1a94c8SDamien Le Moal struct dmz_mblock *mblk, *next; 23213b1a94c8SDamien Le Moal int i; 23223b1a94c8SDamien Le Moal 23233b1a94c8SDamien Le Moal /* Release zone mapping resources */ 23243b1a94c8SDamien Le Moal if (zmd->map_mblk) { 23253b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_map_blocks; i++) 23263b1a94c8SDamien Le Moal dmz_release_mblock(zmd, zmd->map_mblk[i]); 23273b1a94c8SDamien Le Moal kfree(zmd->map_mblk); 23283b1a94c8SDamien Le Moal zmd->map_mblk = NULL; 23293b1a94c8SDamien Le Moal } 23303b1a94c8SDamien Le Moal 23313b1a94c8SDamien Le Moal /* Release super blocks */ 23323b1a94c8SDamien Le Moal for (i = 0; i < 2; i++) { 23333b1a94c8SDamien Le Moal if (zmd->sb[i].mblk) { 23343b1a94c8SDamien Le Moal dmz_free_mblock(zmd, zmd->sb[i].mblk); 23353b1a94c8SDamien Le Moal zmd->sb[i].mblk = NULL; 23363b1a94c8SDamien Le Moal } 23373b1a94c8SDamien Le Moal } 23383b1a94c8SDamien Le Moal 23393b1a94c8SDamien Le Moal /* Free cached blocks */ 23403b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_dirty_list)) { 23413b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_dirty_list, 23423b1a94c8SDamien Le Moal struct dmz_mblock, link); 23433b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "mblock %llu still in dirty list (ref %u)", 234433c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 23453b1a94c8SDamien Le Moal list_del_init(&mblk->link); 23463b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 23473b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 23483b1a94c8SDamien Le Moal } 23493b1a94c8SDamien Le Moal 23503b1a94c8SDamien Le Moal while (!list_empty(&zmd->mblk_lru_list)) { 23513b1a94c8SDamien Le Moal mblk = list_first_entry(&zmd->mblk_lru_list, 23523b1a94c8SDamien Le Moal struct dmz_mblock, link); 23533b1a94c8SDamien Le Moal list_del_init(&mblk->link); 23543b1a94c8SDamien Le Moal rb_erase(&mblk->node, &zmd->mblk_rbtree); 23553b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 23563b1a94c8SDamien Le Moal } 23573b1a94c8SDamien Le Moal 23583b1a94c8SDamien Le Moal /* Sanity checks: the mblock rbtree should now be empty */ 23593b1a94c8SDamien Le Moal root = &zmd->mblk_rbtree; 23603b1a94c8SDamien Le Moal rbtree_postorder_for_each_entry_safe(mblk, next, root, node) { 23613b1a94c8SDamien Le Moal dmz_dev_warn(zmd->dev, "mblock %llu ref %u still in rbtree", 236233c2865fSDamien Le Moal (u64)mblk->no, mblk->ref); 236333c2865fSDamien Le Moal mblk->ref = 0; 23643b1a94c8SDamien Le Moal dmz_free_mblock(zmd, mblk); 23653b1a94c8SDamien Le Moal } 23663b1a94c8SDamien Le Moal 23673b1a94c8SDamien Le Moal /* Free the zone descriptors */ 23683b1a94c8SDamien Le Moal dmz_drop_zones(zmd); 2369d5ffebddSMike Snitzer 2370d5ffebddSMike Snitzer mutex_destroy(&zmd->mblk_flush_lock); 2371d5ffebddSMike Snitzer mutex_destroy(&zmd->map_lock); 23723b1a94c8SDamien Le Moal } 23733b1a94c8SDamien Le Moal 23743b1a94c8SDamien Le Moal /* 23753b1a94c8SDamien Le Moal * Initialize the zoned metadata. 23763b1a94c8SDamien Le Moal */ 23773b1a94c8SDamien Le Moal int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata) 23783b1a94c8SDamien Le Moal { 23793b1a94c8SDamien Le Moal struct dmz_metadata *zmd; 23803b1a94c8SDamien Le Moal unsigned int i, zid; 23813b1a94c8SDamien Le Moal struct dm_zone *zone; 23823b1a94c8SDamien Le Moal int ret; 23833b1a94c8SDamien Le Moal 23843b1a94c8SDamien Le Moal zmd = kzalloc(sizeof(struct dmz_metadata), GFP_KERNEL); 23853b1a94c8SDamien Le Moal if (!zmd) 23863b1a94c8SDamien Le Moal return -ENOMEM; 23873b1a94c8SDamien Le Moal 23883b1a94c8SDamien Le Moal zmd->dev = dev; 23893b1a94c8SDamien Le Moal zmd->mblk_rbtree = RB_ROOT; 23903b1a94c8SDamien Le Moal init_rwsem(&zmd->mblk_sem); 23913b1a94c8SDamien Le Moal mutex_init(&zmd->mblk_flush_lock); 23923b1a94c8SDamien Le Moal spin_lock_init(&zmd->mblk_lock); 23933b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_lru_list); 23943b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->mblk_dirty_list); 23953b1a94c8SDamien Le Moal 23963b1a94c8SDamien Le Moal mutex_init(&zmd->map_lock); 23973b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_rnd, 0); 23983b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_rnd_list); 23993b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_rnd_list); 24003b1a94c8SDamien Le Moal 24013b1a94c8SDamien Le Moal atomic_set(&zmd->unmap_nr_seq, 0); 24023b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->unmap_seq_list); 24033b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->map_seq_list); 24043b1a94c8SDamien Le Moal 24053b1a94c8SDamien Le Moal atomic_set(&zmd->nr_reserved_seq_zones, 0); 24063b1a94c8SDamien Le Moal INIT_LIST_HEAD(&zmd->reserved_seq_zones_list); 24073b1a94c8SDamien Le Moal 24083b1a94c8SDamien Le Moal init_waitqueue_head(&zmd->free_wq); 24093b1a94c8SDamien Le Moal 24103b1a94c8SDamien Le Moal /* Initialize zone descriptors */ 24113b1a94c8SDamien Le Moal ret = dmz_init_zones(zmd); 24123b1a94c8SDamien Le Moal if (ret) 24133b1a94c8SDamien Le Moal goto err; 24143b1a94c8SDamien Le Moal 24153b1a94c8SDamien Le Moal /* Get super block */ 24163b1a94c8SDamien Le Moal ret = dmz_load_sb(zmd); 24173b1a94c8SDamien Le Moal if (ret) 24183b1a94c8SDamien Le Moal goto err; 24193b1a94c8SDamien Le Moal 24203b1a94c8SDamien Le Moal /* Set metadata zones starting from sb_zone */ 24213b1a94c8SDamien Le Moal zid = dmz_id(zmd, zmd->sb_zone); 24223b1a94c8SDamien Le Moal for (i = 0; i < zmd->nr_meta_zones << 1; i++) { 24233b1a94c8SDamien Le Moal zone = dmz_get(zmd, zid + i); 24243b1a94c8SDamien Le Moal if (!dmz_is_rnd(zone)) 24253b1a94c8SDamien Le Moal goto err; 24263b1a94c8SDamien Le Moal set_bit(DMZ_META, &zone->flags); 24273b1a94c8SDamien Le Moal } 24283b1a94c8SDamien Le Moal 24293b1a94c8SDamien Le Moal /* Load mapping table */ 24303b1a94c8SDamien Le Moal ret = dmz_load_mapping(zmd); 24313b1a94c8SDamien Le Moal if (ret) 24323b1a94c8SDamien Le Moal goto err; 24333b1a94c8SDamien Le Moal 24343b1a94c8SDamien Le Moal /* 24353b1a94c8SDamien Le Moal * Cache size boundaries: allow at least 2 super blocks, the chunk map 24363b1a94c8SDamien Le Moal * blocks and enough blocks to be able to cache the bitmap blocks of 24373b1a94c8SDamien Le Moal * up to 16 zones when idle (min_nr_mblks). Otherwise, if busy, allow 24383b1a94c8SDamien Le Moal * the cache to add 512 more metadata blocks. 24393b1a94c8SDamien Le Moal */ 24403b1a94c8SDamien Le Moal zmd->min_nr_mblks = 2 + zmd->nr_map_blocks + zmd->zone_nr_bitmap_blocks * 16; 24413b1a94c8SDamien Le Moal zmd->max_nr_mblks = zmd->min_nr_mblks + 512; 24423b1a94c8SDamien Le Moal zmd->mblk_shrinker.count_objects = dmz_mblock_shrinker_count; 24433b1a94c8SDamien Le Moal zmd->mblk_shrinker.scan_objects = dmz_mblock_shrinker_scan; 24443b1a94c8SDamien Le Moal zmd->mblk_shrinker.seeks = DEFAULT_SEEKS; 24453b1a94c8SDamien Le Moal 24463b1a94c8SDamien Le Moal /* Metadata cache shrinker */ 24473b1a94c8SDamien Le Moal ret = register_shrinker(&zmd->mblk_shrinker); 24483b1a94c8SDamien Le Moal if (ret) { 24493b1a94c8SDamien Le Moal dmz_dev_err(dev, "Register metadata cache shrinker failed"); 24503b1a94c8SDamien Le Moal goto err; 24513b1a94c8SDamien Le Moal } 24523b1a94c8SDamien Le Moal 24533b1a94c8SDamien Le Moal dmz_dev_info(dev, "Host-%s zoned block device", 24543b1a94c8SDamien Le Moal bdev_zoned_model(dev->bdev) == BLK_ZONED_HA ? 24553b1a94c8SDamien Le Moal "aware" : "managed"); 24563b1a94c8SDamien Le Moal dmz_dev_info(dev, " %llu 512-byte logical sectors", 24573b1a94c8SDamien Le Moal (u64)dev->capacity); 24583b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u zones of %llu 512-byte logical sectors", 24593b1a94c8SDamien Le Moal dev->nr_zones, (u64)dev->zone_nr_sectors); 24603b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u metadata zones", 24613b1a94c8SDamien Le Moal zmd->nr_meta_zones * 2); 24623b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u data zones for %u chunks", 24633b1a94c8SDamien Le Moal zmd->nr_data_zones, zmd->nr_chunks); 24643b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u random zones (%u unmapped)", 24653b1a94c8SDamien Le Moal zmd->nr_rnd, atomic_read(&zmd->unmap_nr_rnd)); 24663b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u sequential zones (%u unmapped)", 24673b1a94c8SDamien Le Moal zmd->nr_seq, atomic_read(&zmd->unmap_nr_seq)); 24683b1a94c8SDamien Le Moal dmz_dev_info(dev, " %u reserved sequential data zones", 24693b1a94c8SDamien Le Moal zmd->nr_reserved_seq); 24703b1a94c8SDamien Le Moal 24713b1a94c8SDamien Le Moal dmz_dev_debug(dev, "Format:"); 24723b1a94c8SDamien Le Moal dmz_dev_debug(dev, "%u metadata blocks per set (%u max cache)", 24733b1a94c8SDamien Le Moal zmd->nr_meta_blocks, zmd->max_nr_mblks); 24743b1a94c8SDamien Le Moal dmz_dev_debug(dev, " %u data zone mapping blocks", 24753b1a94c8SDamien Le Moal zmd->nr_map_blocks); 24763b1a94c8SDamien Le Moal dmz_dev_debug(dev, " %u bitmap blocks", 24773b1a94c8SDamien Le Moal zmd->nr_bitmap_blocks); 24783b1a94c8SDamien Le Moal 24793b1a94c8SDamien Le Moal *metadata = zmd; 24803b1a94c8SDamien Le Moal 24813b1a94c8SDamien Le Moal return 0; 24823b1a94c8SDamien Le Moal err: 24833b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 24843b1a94c8SDamien Le Moal kfree(zmd); 24853b1a94c8SDamien Le Moal *metadata = NULL; 24863b1a94c8SDamien Le Moal 24873b1a94c8SDamien Le Moal return ret; 24883b1a94c8SDamien Le Moal } 24893b1a94c8SDamien Le Moal 24903b1a94c8SDamien Le Moal /* 24913b1a94c8SDamien Le Moal * Cleanup the zoned metadata resources. 24923b1a94c8SDamien Le Moal */ 24933b1a94c8SDamien Le Moal void dmz_dtr_metadata(struct dmz_metadata *zmd) 24943b1a94c8SDamien Le Moal { 24953b1a94c8SDamien Le Moal unregister_shrinker(&zmd->mblk_shrinker); 24963b1a94c8SDamien Le Moal dmz_cleanup_metadata(zmd); 24973b1a94c8SDamien Le Moal kfree(zmd); 24983b1a94c8SDamien Le Moal } 24993b1a94c8SDamien Le Moal 25003b1a94c8SDamien Le Moal /* 25013b1a94c8SDamien Le Moal * Check zone information on resume. 25023b1a94c8SDamien Le Moal */ 25033b1a94c8SDamien Le Moal int dmz_resume_metadata(struct dmz_metadata *zmd) 25043b1a94c8SDamien Le Moal { 25053b1a94c8SDamien Le Moal struct dmz_dev *dev = zmd->dev; 25063b1a94c8SDamien Le Moal struct dm_zone *zone; 25073b1a94c8SDamien Le Moal sector_t wp_block; 25083b1a94c8SDamien Le Moal unsigned int i; 25093b1a94c8SDamien Le Moal int ret; 25103b1a94c8SDamien Le Moal 25113b1a94c8SDamien Le Moal /* Check zones */ 25123b1a94c8SDamien Le Moal for (i = 0; i < dev->nr_zones; i++) { 25133b1a94c8SDamien Le Moal zone = dmz_get(zmd, i); 25143b1a94c8SDamien Le Moal if (!zone) { 25153b1a94c8SDamien Le Moal dmz_dev_err(dev, "Unable to get zone %u", i); 25163b1a94c8SDamien Le Moal return -EIO; 25173b1a94c8SDamien Le Moal } 25183b1a94c8SDamien Le Moal 25193b1a94c8SDamien Le Moal wp_block = zone->wp_block; 25203b1a94c8SDamien Le Moal 25213b1a94c8SDamien Le Moal ret = dmz_update_zone(zmd, zone); 25223b1a94c8SDamien Le Moal if (ret) { 25233b1a94c8SDamien Le Moal dmz_dev_err(dev, "Broken zone %u", i); 25243b1a94c8SDamien Le Moal return ret; 25253b1a94c8SDamien Le Moal } 25263b1a94c8SDamien Le Moal 25273b1a94c8SDamien Le Moal if (dmz_is_offline(zone)) { 25283b1a94c8SDamien Le Moal dmz_dev_warn(dev, "Zone %u is offline", i); 25293b1a94c8SDamien Le Moal continue; 25303b1a94c8SDamien Le Moal } 25313b1a94c8SDamien Le Moal 25323b1a94c8SDamien Le Moal /* Check write pointer */ 25333b1a94c8SDamien Le Moal if (!dmz_is_seq(zone)) 25343b1a94c8SDamien Le Moal zone->wp_block = 0; 25353b1a94c8SDamien Le Moal else if (zone->wp_block != wp_block) { 25363b1a94c8SDamien Le Moal dmz_dev_err(dev, "Zone %u: Invalid wp (%llu / %llu)", 25373b1a94c8SDamien Le Moal i, (u64)zone->wp_block, (u64)wp_block); 25383b1a94c8SDamien Le Moal zone->wp_block = wp_block; 25393b1a94c8SDamien Le Moal dmz_invalidate_blocks(zmd, zone, zone->wp_block, 25403b1a94c8SDamien Le Moal dev->zone_nr_blocks - zone->wp_block); 25413b1a94c8SDamien Le Moal } 25423b1a94c8SDamien Le Moal } 25433b1a94c8SDamien Le Moal 25443b1a94c8SDamien Le Moal return 0; 25453b1a94c8SDamien Le Moal } 2546