1f6bed0efSShaohua Li /* 2f6bed0efSShaohua Li * Copyright (C) 2015 Shaohua Li <shli@fb.com> 3f6bed0efSShaohua Li * 4f6bed0efSShaohua Li * This program is free software; you can redistribute it and/or modify it 5f6bed0efSShaohua Li * under the terms and conditions of the GNU General Public License, 6f6bed0efSShaohua Li * version 2, as published by the Free Software Foundation. 7f6bed0efSShaohua Li * 8f6bed0efSShaohua Li * This program is distributed in the hope it will be useful, but WITHOUT 9f6bed0efSShaohua Li * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10f6bed0efSShaohua Li * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11f6bed0efSShaohua Li * more details. 12f6bed0efSShaohua Li * 13f6bed0efSShaohua Li */ 14f6bed0efSShaohua Li #include <linux/kernel.h> 15f6bed0efSShaohua Li #include <linux/wait.h> 16f6bed0efSShaohua Li #include <linux/blkdev.h> 17f6bed0efSShaohua Li #include <linux/slab.h> 18f6bed0efSShaohua Li #include <linux/raid/md_p.h> 195cb2fbd6SShaohua Li #include <linux/crc32c.h> 20f6bed0efSShaohua Li #include <linux/random.h> 21f6bed0efSShaohua Li #include "md.h" 22f6bed0efSShaohua Li #include "raid5.h" 23f6bed0efSShaohua Li 24f6bed0efSShaohua Li /* 25f6bed0efSShaohua Li * metadata/data stored in disk with 4k size unit (a block) regardless 26f6bed0efSShaohua Li * underneath hardware sector size. only works with PAGE_SIZE == 4096 27f6bed0efSShaohua Li */ 28f6bed0efSShaohua Li #define BLOCK_SECTORS (8) 29f6bed0efSShaohua Li 300576b1c6SShaohua Li /* 310576b1c6SShaohua Li * reclaim runs every 1/4 disk size or 10G reclaimable space. This can prevent 320576b1c6SShaohua Li * recovery scans a very long log 330576b1c6SShaohua Li */ 340576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE (10 * 1024 * 1024 * 2) /* sector */ 350576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE_SHIFT (2) 360576b1c6SShaohua Li 37f6bed0efSShaohua Li struct r5l_log { 38f6bed0efSShaohua Li struct md_rdev *rdev; 39f6bed0efSShaohua Li 40f6bed0efSShaohua Li u32 uuid_checksum; 41f6bed0efSShaohua Li 42f6bed0efSShaohua Li sector_t device_size; /* log device size, round to 43f6bed0efSShaohua Li * BLOCK_SECTORS */ 440576b1c6SShaohua Li sector_t max_free_space; /* reclaim run if free space is at 450576b1c6SShaohua Li * this size */ 46f6bed0efSShaohua Li 47f6bed0efSShaohua Li sector_t last_checkpoint; /* log tail. where recovery scan 48f6bed0efSShaohua Li * starts from */ 49f6bed0efSShaohua Li u64 last_cp_seq; /* log tail sequence */ 50f6bed0efSShaohua Li 51f6bed0efSShaohua Li sector_t log_start; /* log head. where new data appends */ 52f6bed0efSShaohua Li u64 seq; /* log head sequence */ 53f6bed0efSShaohua Li 5417036461SChristoph Hellwig sector_t next_checkpoint; 5517036461SChristoph Hellwig u64 next_cp_seq; 5617036461SChristoph Hellwig 57f6bed0efSShaohua Li struct mutex io_mutex; 58f6bed0efSShaohua Li struct r5l_io_unit *current_io; /* current io_unit accepting new data */ 59f6bed0efSShaohua Li 60f6bed0efSShaohua Li spinlock_t io_list_lock; 61f6bed0efSShaohua Li struct list_head running_ios; /* io_units which are still running, 62f6bed0efSShaohua Li * and have not yet been completely 63f6bed0efSShaohua Li * written to the log */ 64f6bed0efSShaohua Li struct list_head io_end_ios; /* io_units which have been completely 65f6bed0efSShaohua Li * written to the log but not yet written 66f6bed0efSShaohua Li * to the RAID */ 67a8c34f91SShaohua Li struct list_head flushing_ios; /* io_units which are waiting for log 68a8c34f91SShaohua Li * cache flush */ 6904732f74SChristoph Hellwig struct list_head finished_ios; /* io_units which settle down in log disk */ 70a8c34f91SShaohua Li struct bio flush_bio; 71f6bed0efSShaohua Li 72f6bed0efSShaohua Li struct kmem_cache *io_kc; 73f6bed0efSShaohua Li 740576b1c6SShaohua Li struct md_thread *reclaim_thread; 750576b1c6SShaohua Li unsigned long reclaim_target; /* number of space that need to be 760576b1c6SShaohua Li * reclaimed. if it's 0, reclaim spaces 770576b1c6SShaohua Li * used by io_units which are in 780576b1c6SShaohua Li * IO_UNIT_STRIPE_END state (eg, reclaim 790576b1c6SShaohua Li * dones't wait for specific io_unit 800576b1c6SShaohua Li * switching to IO_UNIT_STRIPE_END 810576b1c6SShaohua Li * state) */ 820fd22b45SShaohua Li wait_queue_head_t iounit_wait; 830576b1c6SShaohua Li 84f6bed0efSShaohua Li struct list_head no_space_stripes; /* pending stripes, log has no space */ 85f6bed0efSShaohua Li spinlock_t no_space_stripes_lock; 8656fef7c6SChristoph Hellwig 8756fef7c6SChristoph Hellwig bool need_cache_flush; 884b482044SShaohua Li bool in_teardown; 89f6bed0efSShaohua Li }; 90f6bed0efSShaohua Li 91f6bed0efSShaohua Li /* 92f6bed0efSShaohua Li * an IO range starts from a meta data block and end at the next meta data 93f6bed0efSShaohua Li * block. The io unit's the meta data block tracks data/parity followed it. io 94f6bed0efSShaohua Li * unit is written to log disk with normal write, as we always flush log disk 95f6bed0efSShaohua Li * first and then start move data to raid disks, there is no requirement to 96f6bed0efSShaohua Li * write io unit with FLUSH/FUA 97f6bed0efSShaohua Li */ 98f6bed0efSShaohua Li struct r5l_io_unit { 99f6bed0efSShaohua Li struct r5l_log *log; 100f6bed0efSShaohua Li 101f6bed0efSShaohua Li struct page *meta_page; /* store meta block */ 102f6bed0efSShaohua Li int meta_offset; /* current offset in meta_page */ 103f6bed0efSShaohua Li 104f6bed0efSShaohua Li struct bio *current_bio;/* current_bio accepting new data */ 105f6bed0efSShaohua Li 106f6bed0efSShaohua Li atomic_t pending_stripe;/* how many stripes not flushed to raid */ 107f6bed0efSShaohua Li u64 seq; /* seq number of the metablock */ 108f6bed0efSShaohua Li sector_t log_start; /* where the io_unit starts */ 109f6bed0efSShaohua Li sector_t log_end; /* where the io_unit ends */ 110f6bed0efSShaohua Li struct list_head log_sibling; /* log->running_ios */ 111f6bed0efSShaohua Li struct list_head stripe_list; /* stripes added to the io_unit */ 112f6bed0efSShaohua Li 113f6bed0efSShaohua Li int state; 1146143e2ceSChristoph Hellwig bool need_split_bio; 115f6bed0efSShaohua Li }; 116f6bed0efSShaohua Li 117f6bed0efSShaohua Li /* r5l_io_unit state */ 118f6bed0efSShaohua Li enum r5l_io_unit_state { 119f6bed0efSShaohua Li IO_UNIT_RUNNING = 0, /* accepting new IO */ 120f6bed0efSShaohua Li IO_UNIT_IO_START = 1, /* io_unit bio start writing to log, 121f6bed0efSShaohua Li * don't accepting new bio */ 122f6bed0efSShaohua Li IO_UNIT_IO_END = 2, /* io_unit bio finish writing to log */ 123a8c34f91SShaohua Li IO_UNIT_STRIPE_END = 3, /* stripes data finished writing to raid */ 124f6bed0efSShaohua Li }; 125f6bed0efSShaohua Li 126f6bed0efSShaohua Li static sector_t r5l_ring_add(struct r5l_log *log, sector_t start, sector_t inc) 127f6bed0efSShaohua Li { 128f6bed0efSShaohua Li start += inc; 129f6bed0efSShaohua Li if (start >= log->device_size) 130f6bed0efSShaohua Li start = start - log->device_size; 131f6bed0efSShaohua Li return start; 132f6bed0efSShaohua Li } 133f6bed0efSShaohua Li 134f6bed0efSShaohua Li static sector_t r5l_ring_distance(struct r5l_log *log, sector_t start, 135f6bed0efSShaohua Li sector_t end) 136f6bed0efSShaohua Li { 137f6bed0efSShaohua Li if (end >= start) 138f6bed0efSShaohua Li return end - start; 139f6bed0efSShaohua Li else 140f6bed0efSShaohua Li return end + log->device_size - start; 141f6bed0efSShaohua Li } 142f6bed0efSShaohua Li 143f6bed0efSShaohua Li static bool r5l_has_free_space(struct r5l_log *log, sector_t size) 144f6bed0efSShaohua Li { 145f6bed0efSShaohua Li sector_t used_size; 146f6bed0efSShaohua Li 147f6bed0efSShaohua Li used_size = r5l_ring_distance(log, log->last_checkpoint, 148f6bed0efSShaohua Li log->log_start); 149f6bed0efSShaohua Li 150f6bed0efSShaohua Li return log->device_size > used_size + size; 151f6bed0efSShaohua Li } 152f6bed0efSShaohua Li 153f6bed0efSShaohua Li static void r5l_free_io_unit(struct r5l_log *log, struct r5l_io_unit *io) 154f6bed0efSShaohua Li { 155f6bed0efSShaohua Li __free_page(io->meta_page); 156f6bed0efSShaohua Li kmem_cache_free(log->io_kc, io); 157f6bed0efSShaohua Li } 158f6bed0efSShaohua Li 159f6bed0efSShaohua Li static void r5l_move_io_unit_list(struct list_head *from, struct list_head *to, 160f6bed0efSShaohua Li enum r5l_io_unit_state state) 161f6bed0efSShaohua Li { 162f6bed0efSShaohua Li struct r5l_io_unit *io; 163f6bed0efSShaohua Li 164f6bed0efSShaohua Li while (!list_empty(from)) { 165f6bed0efSShaohua Li io = list_first_entry(from, struct r5l_io_unit, log_sibling); 166f6bed0efSShaohua Li /* don't change list order */ 167f6bed0efSShaohua Li if (io->state >= state) 168f6bed0efSShaohua Li list_move_tail(&io->log_sibling, to); 169f6bed0efSShaohua Li else 170f6bed0efSShaohua Li break; 171f6bed0efSShaohua Li } 172f6bed0efSShaohua Li } 173f6bed0efSShaohua Li 174f6bed0efSShaohua Li static void __r5l_set_io_unit_state(struct r5l_io_unit *io, 175f6bed0efSShaohua Li enum r5l_io_unit_state state) 176f6bed0efSShaohua Li { 177f6bed0efSShaohua Li if (WARN_ON(io->state >= state)) 178f6bed0efSShaohua Li return; 179f6bed0efSShaohua Li io->state = state; 180f6bed0efSShaohua Li } 181f6bed0efSShaohua Li 182d8858f43SChristoph Hellwig static void r5l_io_run_stripes(struct r5l_io_unit *io) 183d8858f43SChristoph Hellwig { 184d8858f43SChristoph Hellwig struct stripe_head *sh, *next; 185d8858f43SChristoph Hellwig 186d8858f43SChristoph Hellwig list_for_each_entry_safe(sh, next, &io->stripe_list, log_list) { 187d8858f43SChristoph Hellwig list_del_init(&sh->log_list); 188d8858f43SChristoph Hellwig set_bit(STRIPE_HANDLE, &sh->state); 189d8858f43SChristoph Hellwig raid5_release_stripe(sh); 190d8858f43SChristoph Hellwig } 191d8858f43SChristoph Hellwig } 192d8858f43SChristoph Hellwig 19356fef7c6SChristoph Hellwig static void r5l_log_run_stripes(struct r5l_log *log) 19456fef7c6SChristoph Hellwig { 19556fef7c6SChristoph Hellwig struct r5l_io_unit *io, *next; 19656fef7c6SChristoph Hellwig 19756fef7c6SChristoph Hellwig assert_spin_locked(&log->io_list_lock); 19856fef7c6SChristoph Hellwig 19956fef7c6SChristoph Hellwig list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { 20056fef7c6SChristoph Hellwig /* don't change list order */ 20156fef7c6SChristoph Hellwig if (io->state < IO_UNIT_IO_END) 20256fef7c6SChristoph Hellwig break; 20356fef7c6SChristoph Hellwig 20456fef7c6SChristoph Hellwig list_move_tail(&io->log_sibling, &log->finished_ios); 20556fef7c6SChristoph Hellwig r5l_io_run_stripes(io); 20656fef7c6SChristoph Hellwig } 20756fef7c6SChristoph Hellwig } 20856fef7c6SChristoph Hellwig 209f6bed0efSShaohua Li static void r5l_log_endio(struct bio *bio) 210f6bed0efSShaohua Li { 211f6bed0efSShaohua Li struct r5l_io_unit *io = bio->bi_private; 212f6bed0efSShaohua Li struct r5l_log *log = io->log; 213509ffec7SChristoph Hellwig unsigned long flags; 214f6bed0efSShaohua Li 215*6e74a9cfSShaohua Li if (bio->bi_error) 216*6e74a9cfSShaohua Li md_error(log->rdev->mddev, log->rdev); 217*6e74a9cfSShaohua Li 218f6bed0efSShaohua Li bio_put(bio); 219f6bed0efSShaohua Li 220509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 221509ffec7SChristoph Hellwig __r5l_set_io_unit_state(io, IO_UNIT_IO_END); 22256fef7c6SChristoph Hellwig if (log->need_cache_flush) 223509ffec7SChristoph Hellwig r5l_move_io_unit_list(&log->running_ios, &log->io_end_ios, 224509ffec7SChristoph Hellwig IO_UNIT_IO_END); 22556fef7c6SChristoph Hellwig else 22656fef7c6SChristoph Hellwig r5l_log_run_stripes(log); 227509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 228509ffec7SChristoph Hellwig 22956fef7c6SChristoph Hellwig if (log->need_cache_flush) 230f6bed0efSShaohua Li md_wakeup_thread(log->rdev->mddev->thread); 231f6bed0efSShaohua Li } 232f6bed0efSShaohua Li 233f6bed0efSShaohua Li static void r5l_submit_current_io(struct r5l_log *log) 234f6bed0efSShaohua Li { 235f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 236f6bed0efSShaohua Li struct r5l_meta_block *block; 237509ffec7SChristoph Hellwig unsigned long flags; 238f6bed0efSShaohua Li u32 crc; 239f6bed0efSShaohua Li 240f6bed0efSShaohua Li if (!io) 241f6bed0efSShaohua Li return; 242f6bed0efSShaohua Li 243f6bed0efSShaohua Li block = page_address(io->meta_page); 244f6bed0efSShaohua Li block->meta_size = cpu_to_le32(io->meta_offset); 2455cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, block, PAGE_SIZE); 246f6bed0efSShaohua Li block->checksum = cpu_to_le32(crc); 247f6bed0efSShaohua Li 248f6bed0efSShaohua Li log->current_io = NULL; 249509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 250509ffec7SChristoph Hellwig __r5l_set_io_unit_state(io, IO_UNIT_IO_START); 251509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 252f6bed0efSShaohua Li 2536143e2ceSChristoph Hellwig submit_bio(WRITE, io->current_bio); 254f6bed0efSShaohua Li } 255f6bed0efSShaohua Li 2566143e2ceSChristoph Hellwig static struct bio *r5l_bio_alloc(struct r5l_log *log) 257b349feb3SChristoph Hellwig { 258b349feb3SChristoph Hellwig struct bio *bio = bio_kmalloc(GFP_NOIO | __GFP_NOFAIL, BIO_MAX_PAGES); 259b349feb3SChristoph Hellwig 260b349feb3SChristoph Hellwig bio->bi_rw = WRITE; 261b349feb3SChristoph Hellwig bio->bi_bdev = log->rdev->bdev; 2621e932a37SChristoph Hellwig bio->bi_iter.bi_sector = log->rdev->data_offset + log->log_start; 263b349feb3SChristoph Hellwig 264b349feb3SChristoph Hellwig return bio; 265b349feb3SChristoph Hellwig } 266b349feb3SChristoph Hellwig 267c1b99198SChristoph Hellwig static void r5_reserve_log_entry(struct r5l_log *log, struct r5l_io_unit *io) 268c1b99198SChristoph Hellwig { 269c1b99198SChristoph Hellwig log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS); 270c1b99198SChristoph Hellwig 271c1b99198SChristoph Hellwig /* 272c1b99198SChristoph Hellwig * If we filled up the log device start from the beginning again, 273c1b99198SChristoph Hellwig * which will require a new bio. 274c1b99198SChristoph Hellwig * 275c1b99198SChristoph Hellwig * Note: for this to work properly the log size needs to me a multiple 276c1b99198SChristoph Hellwig * of BLOCK_SECTORS. 277c1b99198SChristoph Hellwig */ 278c1b99198SChristoph Hellwig if (log->log_start == 0) 2796143e2ceSChristoph Hellwig io->need_split_bio = true; 280c1b99198SChristoph Hellwig 281c1b99198SChristoph Hellwig io->log_end = log->log_start; 282c1b99198SChristoph Hellwig } 283c1b99198SChristoph Hellwig 284f6bed0efSShaohua Li static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) 285f6bed0efSShaohua Li { 286f6bed0efSShaohua Li struct r5l_io_unit *io; 287f6bed0efSShaohua Li struct r5l_meta_block *block; 288f6bed0efSShaohua Li 28951039cd0SChristoph Hellwig /* We can't handle memory allocate failure so far */ 29051039cd0SChristoph Hellwig io = kmem_cache_zalloc(log->io_kc, GFP_NOIO | __GFP_NOFAIL); 29151039cd0SChristoph Hellwig io->log = log; 29251039cd0SChristoph Hellwig INIT_LIST_HEAD(&io->log_sibling); 29351039cd0SChristoph Hellwig INIT_LIST_HEAD(&io->stripe_list); 29451039cd0SChristoph Hellwig io->state = IO_UNIT_RUNNING; 295f6bed0efSShaohua Li 29651039cd0SChristoph Hellwig io->meta_page = alloc_page(GFP_NOIO | __GFP_NOFAIL | __GFP_ZERO); 297f6bed0efSShaohua Li block = page_address(io->meta_page); 298f6bed0efSShaohua Li block->magic = cpu_to_le32(R5LOG_MAGIC); 299f6bed0efSShaohua Li block->version = R5LOG_VERSION; 300f6bed0efSShaohua Li block->seq = cpu_to_le64(log->seq); 301f6bed0efSShaohua Li block->position = cpu_to_le64(log->log_start); 302f6bed0efSShaohua Li 303f6bed0efSShaohua Li io->log_start = log->log_start; 304f6bed0efSShaohua Li io->meta_offset = sizeof(struct r5l_meta_block); 3052b8ef16eSChristoph Hellwig io->seq = log->seq++; 306f6bed0efSShaohua Li 3076143e2ceSChristoph Hellwig io->current_bio = r5l_bio_alloc(log); 3086143e2ceSChristoph Hellwig io->current_bio->bi_end_io = r5l_log_endio; 3096143e2ceSChristoph Hellwig io->current_bio->bi_private = io; 310b349feb3SChristoph Hellwig bio_add_page(io->current_bio, io->meta_page, PAGE_SIZE, 0); 311f6bed0efSShaohua Li 312c1b99198SChristoph Hellwig r5_reserve_log_entry(log, io); 313f6bed0efSShaohua Li 314f6bed0efSShaohua Li spin_lock_irq(&log->io_list_lock); 315f6bed0efSShaohua Li list_add_tail(&io->log_sibling, &log->running_ios); 316f6bed0efSShaohua Li spin_unlock_irq(&log->io_list_lock); 317f6bed0efSShaohua Li 318f6bed0efSShaohua Li return io; 319f6bed0efSShaohua Li } 320f6bed0efSShaohua Li 321f6bed0efSShaohua Li static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size) 322f6bed0efSShaohua Li { 32322581f58SChristoph Hellwig if (log->current_io && 32422581f58SChristoph Hellwig log->current_io->meta_offset + payload_size > PAGE_SIZE) 325f6bed0efSShaohua Li r5l_submit_current_io(log); 326f6bed0efSShaohua Li 32722581f58SChristoph Hellwig if (!log->current_io) 328f6bed0efSShaohua Li log->current_io = r5l_new_meta(log); 329f6bed0efSShaohua Li return 0; 330f6bed0efSShaohua Li } 331f6bed0efSShaohua Li 332f6bed0efSShaohua Li static void r5l_append_payload_meta(struct r5l_log *log, u16 type, 333f6bed0efSShaohua Li sector_t location, 334f6bed0efSShaohua Li u32 checksum1, u32 checksum2, 335f6bed0efSShaohua Li bool checksum2_valid) 336f6bed0efSShaohua Li { 337f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 338f6bed0efSShaohua Li struct r5l_payload_data_parity *payload; 339f6bed0efSShaohua Li 340f6bed0efSShaohua Li payload = page_address(io->meta_page) + io->meta_offset; 341f6bed0efSShaohua Li payload->header.type = cpu_to_le16(type); 342f6bed0efSShaohua Li payload->header.flags = cpu_to_le16(0); 343f6bed0efSShaohua Li payload->size = cpu_to_le32((1 + !!checksum2_valid) << 344f6bed0efSShaohua Li (PAGE_SHIFT - 9)); 345f6bed0efSShaohua Li payload->location = cpu_to_le64(location); 346f6bed0efSShaohua Li payload->checksum[0] = cpu_to_le32(checksum1); 347f6bed0efSShaohua Li if (checksum2_valid) 348f6bed0efSShaohua Li payload->checksum[1] = cpu_to_le32(checksum2); 349f6bed0efSShaohua Li 350f6bed0efSShaohua Li io->meta_offset += sizeof(struct r5l_payload_data_parity) + 351f6bed0efSShaohua Li sizeof(__le32) * (1 + !!checksum2_valid); 352f6bed0efSShaohua Li } 353f6bed0efSShaohua Li 354f6bed0efSShaohua Li static void r5l_append_payload_page(struct r5l_log *log, struct page *page) 355f6bed0efSShaohua Li { 356f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 357f6bed0efSShaohua Li 3586143e2ceSChristoph Hellwig if (io->need_split_bio) { 3596143e2ceSChristoph Hellwig struct bio *prev = io->current_bio; 360f6bed0efSShaohua Li 3616143e2ceSChristoph Hellwig io->current_bio = r5l_bio_alloc(log); 3626143e2ceSChristoph Hellwig bio_chain(io->current_bio, prev); 3636143e2ceSChristoph Hellwig 3646143e2ceSChristoph Hellwig submit_bio(WRITE, prev); 365f6bed0efSShaohua Li } 366f6bed0efSShaohua Li 3676143e2ceSChristoph Hellwig if (!bio_add_page(io->current_bio, page, PAGE_SIZE, 0)) 3686143e2ceSChristoph Hellwig BUG(); 3696143e2ceSChristoph Hellwig 370c1b99198SChristoph Hellwig r5_reserve_log_entry(log, io); 371f6bed0efSShaohua Li } 372f6bed0efSShaohua Li 373f6bed0efSShaohua Li static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, 374f6bed0efSShaohua Li int data_pages, int parity_pages) 375f6bed0efSShaohua Li { 376f6bed0efSShaohua Li int i; 377f6bed0efSShaohua Li int meta_size; 378f6bed0efSShaohua Li struct r5l_io_unit *io; 379f6bed0efSShaohua Li 380f6bed0efSShaohua Li meta_size = 381f6bed0efSShaohua Li ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) 382f6bed0efSShaohua Li * data_pages) + 383f6bed0efSShaohua Li sizeof(struct r5l_payload_data_parity) + 384f6bed0efSShaohua Li sizeof(__le32) * parity_pages; 385f6bed0efSShaohua Li 386f6bed0efSShaohua Li r5l_get_meta(log, meta_size); 387f6bed0efSShaohua Li io = log->current_io; 388f6bed0efSShaohua Li 389f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 390f6bed0efSShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) 391f6bed0efSShaohua Li continue; 392f6bed0efSShaohua Li if (i == sh->pd_idx || i == sh->qd_idx) 393f6bed0efSShaohua Li continue; 394f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_DATA, 395f6bed0efSShaohua Li raid5_compute_blocknr(sh, i, 0), 396f6bed0efSShaohua Li sh->dev[i].log_checksum, 0, false); 397f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[i].page); 398f6bed0efSShaohua Li } 399f6bed0efSShaohua Li 400f6bed0efSShaohua Li if (sh->qd_idx >= 0) { 401f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 402f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 403f6bed0efSShaohua Li sh->dev[sh->qd_idx].log_checksum, true); 404f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 405f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->qd_idx].page); 406f6bed0efSShaohua Li } else { 407f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 408f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 409f6bed0efSShaohua Li 0, false); 410f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 411f6bed0efSShaohua Li } 412f6bed0efSShaohua Li 413f6bed0efSShaohua Li list_add_tail(&sh->log_list, &io->stripe_list); 414f6bed0efSShaohua Li atomic_inc(&io->pending_stripe); 415f6bed0efSShaohua Li sh->log_io = io; 416f6bed0efSShaohua Li } 417f6bed0efSShaohua Li 418509ffec7SChristoph Hellwig static void r5l_wake_reclaim(struct r5l_log *log, sector_t space); 419f6bed0efSShaohua Li /* 420f6bed0efSShaohua Li * running in raid5d, where reclaim could wait for raid5d too (when it flushes 421f6bed0efSShaohua Li * data from log to raid disks), so we shouldn't wait for reclaim here 422f6bed0efSShaohua Li */ 423f6bed0efSShaohua Li int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh) 424f6bed0efSShaohua Li { 425f6bed0efSShaohua Li int write_disks = 0; 426f6bed0efSShaohua Li int data_pages, parity_pages; 427f6bed0efSShaohua Li int meta_size; 428f6bed0efSShaohua Li int reserve; 429f6bed0efSShaohua Li int i; 430f6bed0efSShaohua Li 431f6bed0efSShaohua Li if (!log) 432f6bed0efSShaohua Li return -EAGAIN; 433f6bed0efSShaohua Li /* Don't support stripe batch */ 434f6bed0efSShaohua Li if (sh->log_io || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || 435f6bed0efSShaohua Li test_bit(STRIPE_SYNCING, &sh->state)) { 436f6bed0efSShaohua Li /* the stripe is written to log, we start writing it to raid */ 437f6bed0efSShaohua Li clear_bit(STRIPE_LOG_TRAPPED, &sh->state); 438f6bed0efSShaohua Li return -EAGAIN; 439f6bed0efSShaohua Li } 440f6bed0efSShaohua Li 441f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 442f6bed0efSShaohua Li void *addr; 443f6bed0efSShaohua Li 444f6bed0efSShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) 445f6bed0efSShaohua Li continue; 446f6bed0efSShaohua Li write_disks++; 447f6bed0efSShaohua Li /* checksum is already calculated in last run */ 448f6bed0efSShaohua Li if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) 449f6bed0efSShaohua Li continue; 450f6bed0efSShaohua Li addr = kmap_atomic(sh->dev[i].page); 4515cb2fbd6SShaohua Li sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, 452f6bed0efSShaohua Li addr, PAGE_SIZE); 453f6bed0efSShaohua Li kunmap_atomic(addr); 454f6bed0efSShaohua Li } 455f6bed0efSShaohua Li parity_pages = 1 + !!(sh->qd_idx >= 0); 456f6bed0efSShaohua Li data_pages = write_disks - parity_pages; 457f6bed0efSShaohua Li 458f6bed0efSShaohua Li meta_size = 459f6bed0efSShaohua Li ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) 460f6bed0efSShaohua Li * data_pages) + 461f6bed0efSShaohua Li sizeof(struct r5l_payload_data_parity) + 462f6bed0efSShaohua Li sizeof(__le32) * parity_pages; 463f6bed0efSShaohua Li /* Doesn't work with very big raid array */ 464f6bed0efSShaohua Li if (meta_size + sizeof(struct r5l_meta_block) > PAGE_SIZE) 465f6bed0efSShaohua Li return -EINVAL; 466f6bed0efSShaohua Li 467f6bed0efSShaohua Li set_bit(STRIPE_LOG_TRAPPED, &sh->state); 468253f9fd4SShaohua Li /* 469253f9fd4SShaohua Li * The stripe must enter state machine again to finish the write, so 470253f9fd4SShaohua Li * don't delay. 471253f9fd4SShaohua Li */ 472253f9fd4SShaohua Li clear_bit(STRIPE_DELAYED, &sh->state); 473f6bed0efSShaohua Li atomic_inc(&sh->count); 474f6bed0efSShaohua Li 475f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 476f6bed0efSShaohua Li /* meta + data */ 477f6bed0efSShaohua Li reserve = (1 + write_disks) << (PAGE_SHIFT - 9); 478f6bed0efSShaohua Li if (r5l_has_free_space(log, reserve)) 479f6bed0efSShaohua Li r5l_log_stripe(log, sh, data_pages, parity_pages); 480f6bed0efSShaohua Li else { 481f6bed0efSShaohua Li spin_lock(&log->no_space_stripes_lock); 482f6bed0efSShaohua Li list_add_tail(&sh->log_list, &log->no_space_stripes); 483f6bed0efSShaohua Li spin_unlock(&log->no_space_stripes_lock); 484f6bed0efSShaohua Li 485f6bed0efSShaohua Li r5l_wake_reclaim(log, reserve); 486f6bed0efSShaohua Li } 487f6bed0efSShaohua Li mutex_unlock(&log->io_mutex); 488f6bed0efSShaohua Li 489f6bed0efSShaohua Li return 0; 490f6bed0efSShaohua Li } 491f6bed0efSShaohua Li 492f6bed0efSShaohua Li void r5l_write_stripe_run(struct r5l_log *log) 493f6bed0efSShaohua Li { 494f6bed0efSShaohua Li if (!log) 495f6bed0efSShaohua Li return; 496f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 497f6bed0efSShaohua Li r5l_submit_current_io(log); 498f6bed0efSShaohua Li mutex_unlock(&log->io_mutex); 499f6bed0efSShaohua Li } 500f6bed0efSShaohua Li 501828cbe98SShaohua Li int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio) 502828cbe98SShaohua Li { 503828cbe98SShaohua Li if (!log) 504828cbe98SShaohua Li return -ENODEV; 505828cbe98SShaohua Li /* 506828cbe98SShaohua Li * we flush log disk cache first, then write stripe data to raid disks. 507828cbe98SShaohua Li * So if bio is finished, the log disk cache is flushed already. The 508828cbe98SShaohua Li * recovery guarantees we can recovery the bio from log disk, so we 509828cbe98SShaohua Li * don't need to flush again 510828cbe98SShaohua Li */ 511828cbe98SShaohua Li if (bio->bi_iter.bi_size == 0) { 512828cbe98SShaohua Li bio_endio(bio); 513828cbe98SShaohua Li return 0; 514828cbe98SShaohua Li } 515828cbe98SShaohua Li bio->bi_rw &= ~REQ_FLUSH; 516828cbe98SShaohua Li return -EAGAIN; 517828cbe98SShaohua Li } 518828cbe98SShaohua Li 519f6bed0efSShaohua Li /* This will run after log space is reclaimed */ 520f6bed0efSShaohua Li static void r5l_run_no_space_stripes(struct r5l_log *log) 521f6bed0efSShaohua Li { 522f6bed0efSShaohua Li struct stripe_head *sh; 523f6bed0efSShaohua Li 524f6bed0efSShaohua Li spin_lock(&log->no_space_stripes_lock); 525f6bed0efSShaohua Li while (!list_empty(&log->no_space_stripes)) { 526f6bed0efSShaohua Li sh = list_first_entry(&log->no_space_stripes, 527f6bed0efSShaohua Li struct stripe_head, log_list); 528f6bed0efSShaohua Li list_del_init(&sh->log_list); 529f6bed0efSShaohua Li set_bit(STRIPE_HANDLE, &sh->state); 530f6bed0efSShaohua Li raid5_release_stripe(sh); 531f6bed0efSShaohua Li } 532f6bed0efSShaohua Li spin_unlock(&log->no_space_stripes_lock); 533f6bed0efSShaohua Li } 534f6bed0efSShaohua Li 53517036461SChristoph Hellwig static sector_t r5l_reclaimable_space(struct r5l_log *log) 53617036461SChristoph Hellwig { 53717036461SChristoph Hellwig return r5l_ring_distance(log, log->last_checkpoint, 53817036461SChristoph Hellwig log->next_checkpoint); 53917036461SChristoph Hellwig } 54017036461SChristoph Hellwig 54104732f74SChristoph Hellwig static bool r5l_complete_finished_ios(struct r5l_log *log) 54217036461SChristoph Hellwig { 54317036461SChristoph Hellwig struct r5l_io_unit *io, *next; 54417036461SChristoph Hellwig bool found = false; 54517036461SChristoph Hellwig 54617036461SChristoph Hellwig assert_spin_locked(&log->io_list_lock); 54717036461SChristoph Hellwig 54804732f74SChristoph Hellwig list_for_each_entry_safe(io, next, &log->finished_ios, log_sibling) { 54917036461SChristoph Hellwig /* don't change list order */ 55017036461SChristoph Hellwig if (io->state < IO_UNIT_STRIPE_END) 55117036461SChristoph Hellwig break; 55217036461SChristoph Hellwig 55317036461SChristoph Hellwig log->next_checkpoint = io->log_start; 55417036461SChristoph Hellwig log->next_cp_seq = io->seq; 55517036461SChristoph Hellwig 55617036461SChristoph Hellwig list_del(&io->log_sibling); 55717036461SChristoph Hellwig r5l_free_io_unit(log, io); 55817036461SChristoph Hellwig 55917036461SChristoph Hellwig found = true; 56017036461SChristoph Hellwig } 56117036461SChristoph Hellwig 56217036461SChristoph Hellwig return found; 56317036461SChristoph Hellwig } 56417036461SChristoph Hellwig 565509ffec7SChristoph Hellwig static void __r5l_stripe_write_finished(struct r5l_io_unit *io) 566509ffec7SChristoph Hellwig { 567509ffec7SChristoph Hellwig struct r5l_log *log = io->log; 568509ffec7SChristoph Hellwig unsigned long flags; 569509ffec7SChristoph Hellwig 570509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 571509ffec7SChristoph Hellwig __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); 57217036461SChristoph Hellwig 57304732f74SChristoph Hellwig if (!r5l_complete_finished_ios(log)) { 57485f2f9a4SShaohua Li spin_unlock_irqrestore(&log->io_list_lock, flags); 57585f2f9a4SShaohua Li return; 57685f2f9a4SShaohua Li } 577509ffec7SChristoph Hellwig 57817036461SChristoph Hellwig if (r5l_reclaimable_space(log) > log->max_free_space) 579509ffec7SChristoph Hellwig r5l_wake_reclaim(log, 0); 580509ffec7SChristoph Hellwig 581509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 582509ffec7SChristoph Hellwig wake_up(&log->iounit_wait); 583509ffec7SChristoph Hellwig } 584509ffec7SChristoph Hellwig 5850576b1c6SShaohua Li void r5l_stripe_write_finished(struct stripe_head *sh) 5860576b1c6SShaohua Li { 5870576b1c6SShaohua Li struct r5l_io_unit *io; 5880576b1c6SShaohua Li 5890576b1c6SShaohua Li io = sh->log_io; 5900576b1c6SShaohua Li sh->log_io = NULL; 5910576b1c6SShaohua Li 592509ffec7SChristoph Hellwig if (io && atomic_dec_and_test(&io->pending_stripe)) 593509ffec7SChristoph Hellwig __r5l_stripe_write_finished(io); 5940576b1c6SShaohua Li } 5950576b1c6SShaohua Li 596a8c34f91SShaohua Li static void r5l_log_flush_endio(struct bio *bio) 597a8c34f91SShaohua Li { 598a8c34f91SShaohua Li struct r5l_log *log = container_of(bio, struct r5l_log, 599a8c34f91SShaohua Li flush_bio); 600a8c34f91SShaohua Li unsigned long flags; 601a8c34f91SShaohua Li struct r5l_io_unit *io; 602a8c34f91SShaohua Li 603*6e74a9cfSShaohua Li if (bio->bi_error) 604*6e74a9cfSShaohua Li md_error(log->rdev->mddev, log->rdev); 605*6e74a9cfSShaohua Li 606a8c34f91SShaohua Li spin_lock_irqsave(&log->io_list_lock, flags); 607d8858f43SChristoph Hellwig list_for_each_entry(io, &log->flushing_ios, log_sibling) 608d8858f43SChristoph Hellwig r5l_io_run_stripes(io); 60904732f74SChristoph Hellwig list_splice_tail_init(&log->flushing_ios, &log->finished_ios); 610a8c34f91SShaohua Li spin_unlock_irqrestore(&log->io_list_lock, flags); 611a8c34f91SShaohua Li } 612a8c34f91SShaohua Li 6130576b1c6SShaohua Li /* 6140576b1c6SShaohua Li * Starting dispatch IO to raid. 6150576b1c6SShaohua Li * io_unit(meta) consists of a log. There is one situation we want to avoid. A 6160576b1c6SShaohua Li * broken meta in the middle of a log causes recovery can't find meta at the 6170576b1c6SShaohua Li * head of log. If operations require meta at the head persistent in log, we 6180576b1c6SShaohua Li * must make sure meta before it persistent in log too. A case is: 6190576b1c6SShaohua Li * 6200576b1c6SShaohua Li * stripe data/parity is in log, we start write stripe to raid disks. stripe 6210576b1c6SShaohua Li * data/parity must be persistent in log before we do the write to raid disks. 6220576b1c6SShaohua Li * 6230576b1c6SShaohua Li * The solution is we restrictly maintain io_unit list order. In this case, we 6240576b1c6SShaohua Li * only write stripes of an io_unit to raid disks till the io_unit is the first 6250576b1c6SShaohua Li * one whose data/parity is in log. 6260576b1c6SShaohua Li */ 6270576b1c6SShaohua Li void r5l_flush_stripe_to_raid(struct r5l_log *log) 6280576b1c6SShaohua Li { 629a8c34f91SShaohua Li bool do_flush; 63056fef7c6SChristoph Hellwig 63156fef7c6SChristoph Hellwig if (!log || !log->need_cache_flush) 6320576b1c6SShaohua Li return; 6330576b1c6SShaohua Li 634a8c34f91SShaohua Li spin_lock_irq(&log->io_list_lock); 635a8c34f91SShaohua Li /* flush bio is running */ 636a8c34f91SShaohua Li if (!list_empty(&log->flushing_ios)) { 637a8c34f91SShaohua Li spin_unlock_irq(&log->io_list_lock); 6380576b1c6SShaohua Li return; 6390576b1c6SShaohua Li } 640a8c34f91SShaohua Li list_splice_tail_init(&log->io_end_ios, &log->flushing_ios); 641a8c34f91SShaohua Li do_flush = !list_empty(&log->flushing_ios); 6420576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 643a8c34f91SShaohua Li 644a8c34f91SShaohua Li if (!do_flush) 645a8c34f91SShaohua Li return; 646a8c34f91SShaohua Li bio_reset(&log->flush_bio); 647a8c34f91SShaohua Li log->flush_bio.bi_bdev = log->rdev->bdev; 648a8c34f91SShaohua Li log->flush_bio.bi_end_io = r5l_log_flush_endio; 649a8c34f91SShaohua Li submit_bio(WRITE_FLUSH, &log->flush_bio); 6500576b1c6SShaohua Li } 6510576b1c6SShaohua Li 6520576b1c6SShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp); 6534b482044SShaohua Li static void r5l_write_super_and_discard_space(struct r5l_log *log, 6544b482044SShaohua Li sector_t end) 6554b482044SShaohua Li { 6564b482044SShaohua Li struct block_device *bdev = log->rdev->bdev; 6574b482044SShaohua Li struct mddev *mddev; 6584b482044SShaohua Li 6594b482044SShaohua Li r5l_write_super(log, end); 6604b482044SShaohua Li 6614b482044SShaohua Li if (!blk_queue_discard(bdev_get_queue(bdev))) 6624b482044SShaohua Li return; 6634b482044SShaohua Li 6644b482044SShaohua Li mddev = log->rdev->mddev; 6654b482044SShaohua Li /* 6664b482044SShaohua Li * This is to avoid a deadlock. r5l_quiesce holds reconfig_mutex and 6674b482044SShaohua Li * wait for this thread to finish. This thread waits for 6684b482044SShaohua Li * MD_CHANGE_PENDING clear, which is supposed to be done in 6694b482044SShaohua Li * md_check_recovery(). md_check_recovery() tries to get 6704b482044SShaohua Li * reconfig_mutex. Since r5l_quiesce already holds the mutex, 6714b482044SShaohua Li * md_check_recovery() fails, so the PENDING never get cleared. The 6724b482044SShaohua Li * in_teardown check workaround this issue. 6734b482044SShaohua Li */ 6744b482044SShaohua Li if (!log->in_teardown) { 6754b482044SShaohua Li set_bit(MD_CHANGE_DEVS, &mddev->flags); 6764b482044SShaohua Li set_bit(MD_CHANGE_PENDING, &mddev->flags); 6774b482044SShaohua Li md_wakeup_thread(mddev->thread); 6784b482044SShaohua Li wait_event(mddev->sb_wait, 6794b482044SShaohua Li !test_bit(MD_CHANGE_PENDING, &mddev->flags) || 6804b482044SShaohua Li log->in_teardown); 6814b482044SShaohua Li /* 6824b482044SShaohua Li * r5l_quiesce could run after in_teardown check and hold 6834b482044SShaohua Li * mutex first. Superblock might get updated twice. 6844b482044SShaohua Li */ 6854b482044SShaohua Li if (log->in_teardown) 6864b482044SShaohua Li md_update_sb(mddev, 1); 6874b482044SShaohua Li } else { 6884b482044SShaohua Li WARN_ON(!mddev_is_locked(mddev)); 6894b482044SShaohua Li md_update_sb(mddev, 1); 6904b482044SShaohua Li } 6914b482044SShaohua Li 692*6e74a9cfSShaohua Li /* discard IO error really doesn't matter, ignore it */ 6934b482044SShaohua Li if (log->last_checkpoint < end) { 6944b482044SShaohua Li blkdev_issue_discard(bdev, 6954b482044SShaohua Li log->last_checkpoint + log->rdev->data_offset, 6964b482044SShaohua Li end - log->last_checkpoint, GFP_NOIO, 0); 6974b482044SShaohua Li } else { 6984b482044SShaohua Li blkdev_issue_discard(bdev, 6994b482044SShaohua Li log->last_checkpoint + log->rdev->data_offset, 7004b482044SShaohua Li log->device_size - log->last_checkpoint, 7014b482044SShaohua Li GFP_NOIO, 0); 7024b482044SShaohua Li blkdev_issue_discard(bdev, log->rdev->data_offset, end, 7034b482044SShaohua Li GFP_NOIO, 0); 7044b482044SShaohua Li } 7054b482044SShaohua Li } 7064b482044SShaohua Li 7074b482044SShaohua Li 7080576b1c6SShaohua Li static void r5l_do_reclaim(struct r5l_log *log) 7090576b1c6SShaohua Li { 7100576b1c6SShaohua Li sector_t reclaim_target = xchg(&log->reclaim_target, 0); 71117036461SChristoph Hellwig sector_t reclaimable; 71217036461SChristoph Hellwig sector_t next_checkpoint; 71317036461SChristoph Hellwig u64 next_cp_seq; 7140576b1c6SShaohua Li 7150576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 7160576b1c6SShaohua Li /* 7170576b1c6SShaohua Li * move proper io_unit to reclaim list. We should not change the order. 7180576b1c6SShaohua Li * reclaimable/unreclaimable io_unit can be mixed in the list, we 7190576b1c6SShaohua Li * shouldn't reuse space of an unreclaimable io_unit 7200576b1c6SShaohua Li */ 7210576b1c6SShaohua Li while (1) { 72217036461SChristoph Hellwig reclaimable = r5l_reclaimable_space(log); 72317036461SChristoph Hellwig if (reclaimable >= reclaim_target || 7240576b1c6SShaohua Li (list_empty(&log->running_ios) && 7250576b1c6SShaohua Li list_empty(&log->io_end_ios) && 726a8c34f91SShaohua Li list_empty(&log->flushing_ios) && 72704732f74SChristoph Hellwig list_empty(&log->finished_ios))) 7280576b1c6SShaohua Li break; 7290576b1c6SShaohua Li 73017036461SChristoph Hellwig md_wakeup_thread(log->rdev->mddev->thread); 73117036461SChristoph Hellwig wait_event_lock_irq(log->iounit_wait, 73217036461SChristoph Hellwig r5l_reclaimable_space(log) > reclaimable, 73317036461SChristoph Hellwig log->io_list_lock); 7340576b1c6SShaohua Li } 73517036461SChristoph Hellwig 73617036461SChristoph Hellwig next_checkpoint = log->next_checkpoint; 73717036461SChristoph Hellwig next_cp_seq = log->next_cp_seq; 7380576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 7390576b1c6SShaohua Li 74017036461SChristoph Hellwig BUG_ON(reclaimable < 0); 74117036461SChristoph Hellwig if (reclaimable == 0) 7420576b1c6SShaohua Li return; 7430576b1c6SShaohua Li 7440576b1c6SShaohua Li /* 7450576b1c6SShaohua Li * write_super will flush cache of each raid disk. We must write super 7460576b1c6SShaohua Li * here, because the log area might be reused soon and we don't want to 7470576b1c6SShaohua Li * confuse recovery 7480576b1c6SShaohua Li */ 7494b482044SShaohua Li r5l_write_super_and_discard_space(log, next_checkpoint); 7500576b1c6SShaohua Li 7510576b1c6SShaohua Li mutex_lock(&log->io_mutex); 75217036461SChristoph Hellwig log->last_checkpoint = next_checkpoint; 75317036461SChristoph Hellwig log->last_cp_seq = next_cp_seq; 7540576b1c6SShaohua Li mutex_unlock(&log->io_mutex); 7550576b1c6SShaohua Li 75617036461SChristoph Hellwig r5l_run_no_space_stripes(log); 7570576b1c6SShaohua Li } 7580576b1c6SShaohua Li 7590576b1c6SShaohua Li static void r5l_reclaim_thread(struct md_thread *thread) 7600576b1c6SShaohua Li { 7610576b1c6SShaohua Li struct mddev *mddev = thread->mddev; 7620576b1c6SShaohua Li struct r5conf *conf = mddev->private; 7630576b1c6SShaohua Li struct r5l_log *log = conf->log; 7640576b1c6SShaohua Li 7650576b1c6SShaohua Li if (!log) 7660576b1c6SShaohua Li return; 7670576b1c6SShaohua Li r5l_do_reclaim(log); 7680576b1c6SShaohua Li } 7690576b1c6SShaohua Li 770f6bed0efSShaohua Li static void r5l_wake_reclaim(struct r5l_log *log, sector_t space) 771f6bed0efSShaohua Li { 7720576b1c6SShaohua Li unsigned long target; 7730576b1c6SShaohua Li unsigned long new = (unsigned long)space; /* overflow in theory */ 7740576b1c6SShaohua Li 7750576b1c6SShaohua Li do { 7760576b1c6SShaohua Li target = log->reclaim_target; 7770576b1c6SShaohua Li if (new < target) 7780576b1c6SShaohua Li return; 7790576b1c6SShaohua Li } while (cmpxchg(&log->reclaim_target, target, new) != target); 7800576b1c6SShaohua Li md_wakeup_thread(log->reclaim_thread); 781f6bed0efSShaohua Li } 782f6bed0efSShaohua Li 783e6c033f7SShaohua Li void r5l_quiesce(struct r5l_log *log, int state) 784e6c033f7SShaohua Li { 7854b482044SShaohua Li struct mddev *mddev; 786e6c033f7SShaohua Li if (!log || state == 2) 787e6c033f7SShaohua Li return; 788e6c033f7SShaohua Li if (state == 0) { 7894b482044SShaohua Li log->in_teardown = 0; 790e6c033f7SShaohua Li log->reclaim_thread = md_register_thread(r5l_reclaim_thread, 791e6c033f7SShaohua Li log->rdev->mddev, "reclaim"); 792e6c033f7SShaohua Li } else if (state == 1) { 793e6c033f7SShaohua Li /* 794e6c033f7SShaohua Li * at this point all stripes are finished, so io_unit is at 795e6c033f7SShaohua Li * least in STRIPE_END state 796e6c033f7SShaohua Li */ 7974b482044SShaohua Li log->in_teardown = 1; 7984b482044SShaohua Li /* make sure r5l_write_super_and_discard_space exits */ 7994b482044SShaohua Li mddev = log->rdev->mddev; 8004b482044SShaohua Li wake_up(&mddev->sb_wait); 801e6c033f7SShaohua Li r5l_wake_reclaim(log, -1L); 802e6c033f7SShaohua Li md_unregister_thread(&log->reclaim_thread); 803e6c033f7SShaohua Li r5l_do_reclaim(log); 804e6c033f7SShaohua Li } 805e6c033f7SShaohua Li } 806e6c033f7SShaohua Li 807*6e74a9cfSShaohua Li bool r5l_log_disk_error(struct r5conf *conf) 808*6e74a9cfSShaohua Li { 809*6e74a9cfSShaohua Li if (!conf->log) 810*6e74a9cfSShaohua Li return false; 811*6e74a9cfSShaohua Li return test_bit(Faulty, &conf->log->rdev->flags); 812*6e74a9cfSShaohua Li } 813*6e74a9cfSShaohua Li 814355810d1SShaohua Li struct r5l_recovery_ctx { 815355810d1SShaohua Li struct page *meta_page; /* current meta */ 816355810d1SShaohua Li sector_t meta_total_blocks; /* total size of current meta and data */ 817355810d1SShaohua Li sector_t pos; /* recovery position */ 818355810d1SShaohua Li u64 seq; /* recovery position seq */ 819355810d1SShaohua Li }; 820355810d1SShaohua Li 821355810d1SShaohua Li static int r5l_read_meta_block(struct r5l_log *log, 822355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 823355810d1SShaohua Li { 824355810d1SShaohua Li struct page *page = ctx->meta_page; 825355810d1SShaohua Li struct r5l_meta_block *mb; 826355810d1SShaohua Li u32 crc, stored_crc; 827355810d1SShaohua Li 828355810d1SShaohua Li if (!sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, READ, false)) 829355810d1SShaohua Li return -EIO; 830355810d1SShaohua Li 831355810d1SShaohua Li mb = page_address(page); 832355810d1SShaohua Li stored_crc = le32_to_cpu(mb->checksum); 833355810d1SShaohua Li mb->checksum = 0; 834355810d1SShaohua Li 835355810d1SShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 836355810d1SShaohua Li le64_to_cpu(mb->seq) != ctx->seq || 837355810d1SShaohua Li mb->version != R5LOG_VERSION || 838355810d1SShaohua Li le64_to_cpu(mb->position) != ctx->pos) 839355810d1SShaohua Li return -EINVAL; 840355810d1SShaohua Li 8415cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 842355810d1SShaohua Li if (stored_crc != crc) 843355810d1SShaohua Li return -EINVAL; 844355810d1SShaohua Li 845355810d1SShaohua Li if (le32_to_cpu(mb->meta_size) > PAGE_SIZE) 846355810d1SShaohua Li return -EINVAL; 847355810d1SShaohua Li 848355810d1SShaohua Li ctx->meta_total_blocks = BLOCK_SECTORS; 849355810d1SShaohua Li 850355810d1SShaohua Li return 0; 851355810d1SShaohua Li } 852355810d1SShaohua Li 853355810d1SShaohua Li static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 854355810d1SShaohua Li struct r5l_recovery_ctx *ctx, 855355810d1SShaohua Li sector_t stripe_sect, 856355810d1SShaohua Li int *offset, sector_t *log_offset) 857355810d1SShaohua Li { 858355810d1SShaohua Li struct r5conf *conf = log->rdev->mddev->private; 859355810d1SShaohua Li struct stripe_head *sh; 860355810d1SShaohua Li struct r5l_payload_data_parity *payload; 861355810d1SShaohua Li int disk_index; 862355810d1SShaohua Li 863355810d1SShaohua Li sh = raid5_get_active_stripe(conf, stripe_sect, 0, 0, 0); 864355810d1SShaohua Li while (1) { 865355810d1SShaohua Li payload = page_address(ctx->meta_page) + *offset; 866355810d1SShaohua Li 867355810d1SShaohua Li if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { 868355810d1SShaohua Li raid5_compute_sector(conf, 869355810d1SShaohua Li le64_to_cpu(payload->location), 0, 870355810d1SShaohua Li &disk_index, sh); 871355810d1SShaohua Li 872355810d1SShaohua Li sync_page_io(log->rdev, *log_offset, PAGE_SIZE, 873355810d1SShaohua Li sh->dev[disk_index].page, READ, false); 874355810d1SShaohua Li sh->dev[disk_index].log_checksum = 875355810d1SShaohua Li le32_to_cpu(payload->checksum[0]); 876355810d1SShaohua Li set_bit(R5_Wantwrite, &sh->dev[disk_index].flags); 877355810d1SShaohua Li ctx->meta_total_blocks += BLOCK_SECTORS; 878355810d1SShaohua Li } else { 879355810d1SShaohua Li disk_index = sh->pd_idx; 880355810d1SShaohua Li sync_page_io(log->rdev, *log_offset, PAGE_SIZE, 881355810d1SShaohua Li sh->dev[disk_index].page, READ, false); 882355810d1SShaohua Li sh->dev[disk_index].log_checksum = 883355810d1SShaohua Li le32_to_cpu(payload->checksum[0]); 884355810d1SShaohua Li set_bit(R5_Wantwrite, &sh->dev[disk_index].flags); 885355810d1SShaohua Li 886355810d1SShaohua Li if (sh->qd_idx >= 0) { 887355810d1SShaohua Li disk_index = sh->qd_idx; 888355810d1SShaohua Li sync_page_io(log->rdev, 889355810d1SShaohua Li r5l_ring_add(log, *log_offset, BLOCK_SECTORS), 890355810d1SShaohua Li PAGE_SIZE, sh->dev[disk_index].page, 891355810d1SShaohua Li READ, false); 892355810d1SShaohua Li sh->dev[disk_index].log_checksum = 893355810d1SShaohua Li le32_to_cpu(payload->checksum[1]); 894355810d1SShaohua Li set_bit(R5_Wantwrite, 895355810d1SShaohua Li &sh->dev[disk_index].flags); 896355810d1SShaohua Li } 897355810d1SShaohua Li ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded; 898355810d1SShaohua Li } 899355810d1SShaohua Li 900355810d1SShaohua Li *log_offset = r5l_ring_add(log, *log_offset, 901355810d1SShaohua Li le32_to_cpu(payload->size)); 902355810d1SShaohua Li *offset += sizeof(struct r5l_payload_data_parity) + 903355810d1SShaohua Li sizeof(__le32) * 904355810d1SShaohua Li (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); 905355810d1SShaohua Li if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) 906355810d1SShaohua Li break; 907355810d1SShaohua Li } 908355810d1SShaohua Li 909355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) { 910355810d1SShaohua Li void *addr; 911355810d1SShaohua Li u32 checksum; 912355810d1SShaohua Li 913355810d1SShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) 914355810d1SShaohua Li continue; 915355810d1SShaohua Li addr = kmap_atomic(sh->dev[disk_index].page); 9165cb2fbd6SShaohua Li checksum = crc32c_le(log->uuid_checksum, addr, PAGE_SIZE); 917355810d1SShaohua Li kunmap_atomic(addr); 918355810d1SShaohua Li if (checksum != sh->dev[disk_index].log_checksum) 919355810d1SShaohua Li goto error; 920355810d1SShaohua Li } 921355810d1SShaohua Li 922355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) { 923355810d1SShaohua Li struct md_rdev *rdev, *rrdev; 924355810d1SShaohua Li 925355810d1SShaohua Li if (!test_and_clear_bit(R5_Wantwrite, 926355810d1SShaohua Li &sh->dev[disk_index].flags)) 927355810d1SShaohua Li continue; 928355810d1SShaohua Li 929355810d1SShaohua Li /* in case device is broken */ 930355810d1SShaohua Li rdev = rcu_dereference(conf->disks[disk_index].rdev); 931355810d1SShaohua Li if (rdev) 932355810d1SShaohua Li sync_page_io(rdev, stripe_sect, PAGE_SIZE, 933355810d1SShaohua Li sh->dev[disk_index].page, WRITE, false); 934355810d1SShaohua Li rrdev = rcu_dereference(conf->disks[disk_index].replacement); 935355810d1SShaohua Li if (rrdev) 936355810d1SShaohua Li sync_page_io(rrdev, stripe_sect, PAGE_SIZE, 937355810d1SShaohua Li sh->dev[disk_index].page, WRITE, false); 938355810d1SShaohua Li } 939355810d1SShaohua Li raid5_release_stripe(sh); 940355810d1SShaohua Li return 0; 941355810d1SShaohua Li 942355810d1SShaohua Li error: 943355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) 944355810d1SShaohua Li sh->dev[disk_index].flags = 0; 945355810d1SShaohua Li raid5_release_stripe(sh); 946355810d1SShaohua Li return -EINVAL; 947355810d1SShaohua Li } 948355810d1SShaohua Li 949355810d1SShaohua Li static int r5l_recovery_flush_one_meta(struct r5l_log *log, 950355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 951355810d1SShaohua Li { 952355810d1SShaohua Li struct r5conf *conf = log->rdev->mddev->private; 953355810d1SShaohua Li struct r5l_payload_data_parity *payload; 954355810d1SShaohua Li struct r5l_meta_block *mb; 955355810d1SShaohua Li int offset; 956355810d1SShaohua Li sector_t log_offset; 957355810d1SShaohua Li sector_t stripe_sector; 958355810d1SShaohua Li 959355810d1SShaohua Li mb = page_address(ctx->meta_page); 960355810d1SShaohua Li offset = sizeof(struct r5l_meta_block); 961355810d1SShaohua Li log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 962355810d1SShaohua Li 963355810d1SShaohua Li while (offset < le32_to_cpu(mb->meta_size)) { 964355810d1SShaohua Li int dd; 965355810d1SShaohua Li 966355810d1SShaohua Li payload = (void *)mb + offset; 967355810d1SShaohua Li stripe_sector = raid5_compute_sector(conf, 968355810d1SShaohua Li le64_to_cpu(payload->location), 0, &dd, NULL); 969355810d1SShaohua Li if (r5l_recovery_flush_one_stripe(log, ctx, stripe_sector, 970355810d1SShaohua Li &offset, &log_offset)) 971355810d1SShaohua Li return -EINVAL; 972355810d1SShaohua Li } 973355810d1SShaohua Li return 0; 974355810d1SShaohua Li } 975355810d1SShaohua Li 976355810d1SShaohua Li /* copy data/parity from log to raid disks */ 977355810d1SShaohua Li static void r5l_recovery_flush_log(struct r5l_log *log, 978355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 979355810d1SShaohua Li { 980355810d1SShaohua Li while (1) { 981355810d1SShaohua Li if (r5l_read_meta_block(log, ctx)) 982355810d1SShaohua Li return; 983355810d1SShaohua Li if (r5l_recovery_flush_one_meta(log, ctx)) 984355810d1SShaohua Li return; 985355810d1SShaohua Li ctx->seq++; 986355810d1SShaohua Li ctx->pos = r5l_ring_add(log, ctx->pos, ctx->meta_total_blocks); 987355810d1SShaohua Li } 988355810d1SShaohua Li } 989355810d1SShaohua Li 990355810d1SShaohua Li static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, 991355810d1SShaohua Li u64 seq) 992355810d1SShaohua Li { 993355810d1SShaohua Li struct page *page; 994355810d1SShaohua Li struct r5l_meta_block *mb; 995355810d1SShaohua Li u32 crc; 996355810d1SShaohua Li 997355810d1SShaohua Li page = alloc_page(GFP_KERNEL | __GFP_ZERO); 998355810d1SShaohua Li if (!page) 999355810d1SShaohua Li return -ENOMEM; 1000355810d1SShaohua Li mb = page_address(page); 1001355810d1SShaohua Li mb->magic = cpu_to_le32(R5LOG_MAGIC); 1002355810d1SShaohua Li mb->version = R5LOG_VERSION; 1003355810d1SShaohua Li mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); 1004355810d1SShaohua Li mb->seq = cpu_to_le64(seq); 1005355810d1SShaohua Li mb->position = cpu_to_le64(pos); 10065cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 1007355810d1SShaohua Li mb->checksum = cpu_to_le32(crc); 1008355810d1SShaohua Li 1009355810d1SShaohua Li if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, WRITE_FUA, false)) { 1010355810d1SShaohua Li __free_page(page); 1011355810d1SShaohua Li return -EIO; 1012355810d1SShaohua Li } 1013355810d1SShaohua Li __free_page(page); 1014355810d1SShaohua Li return 0; 1015355810d1SShaohua Li } 1016355810d1SShaohua Li 1017f6bed0efSShaohua Li static int r5l_recovery_log(struct r5l_log *log) 1018f6bed0efSShaohua Li { 1019355810d1SShaohua Li struct r5l_recovery_ctx ctx; 1020355810d1SShaohua Li 1021355810d1SShaohua Li ctx.pos = log->last_checkpoint; 1022355810d1SShaohua Li ctx.seq = log->last_cp_seq; 1023355810d1SShaohua Li ctx.meta_page = alloc_page(GFP_KERNEL); 1024355810d1SShaohua Li if (!ctx.meta_page) 1025355810d1SShaohua Li return -ENOMEM; 1026355810d1SShaohua Li 1027355810d1SShaohua Li r5l_recovery_flush_log(log, &ctx); 1028355810d1SShaohua Li __free_page(ctx.meta_page); 1029355810d1SShaohua Li 1030355810d1SShaohua Li /* 1031355810d1SShaohua Li * we did a recovery. Now ctx.pos points to an invalid meta block. New 1032355810d1SShaohua Li * log will start here. but we can't let superblock point to last valid 1033355810d1SShaohua Li * meta block. The log might looks like: 1034355810d1SShaohua Li * | meta 1| meta 2| meta 3| 1035355810d1SShaohua Li * meta 1 is valid, meta 2 is invalid. meta 3 could be valid. If 1036355810d1SShaohua Li * superblock points to meta 1, we write a new valid meta 2n. if crash 1037355810d1SShaohua Li * happens again, new recovery will start from meta 1. Since meta 2n is 1038355810d1SShaohua Li * valid now, recovery will think meta 3 is valid, which is wrong. 1039355810d1SShaohua Li * The solution is we create a new meta in meta2 with its seq == meta 1040355810d1SShaohua Li * 1's seq + 10 and let superblock points to meta2. The same recovery will 1041355810d1SShaohua Li * not think meta 3 is a valid meta, because its seq doesn't match 1042355810d1SShaohua Li */ 1043355810d1SShaohua Li if (ctx.seq > log->last_cp_seq + 1) { 1044355810d1SShaohua Li int ret; 1045355810d1SShaohua Li 1046355810d1SShaohua Li ret = r5l_log_write_empty_meta_block(log, ctx.pos, ctx.seq + 10); 1047355810d1SShaohua Li if (ret) 1048355810d1SShaohua Li return ret; 1049355810d1SShaohua Li log->seq = ctx.seq + 11; 1050355810d1SShaohua Li log->log_start = r5l_ring_add(log, ctx.pos, BLOCK_SECTORS); 1051355810d1SShaohua Li r5l_write_super(log, ctx.pos); 1052355810d1SShaohua Li } else { 1053355810d1SShaohua Li log->log_start = ctx.pos; 1054355810d1SShaohua Li log->seq = ctx.seq; 1055355810d1SShaohua Li } 1056f6bed0efSShaohua Li return 0; 1057f6bed0efSShaohua Li } 1058f6bed0efSShaohua Li 1059f6bed0efSShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp) 1060f6bed0efSShaohua Li { 1061f6bed0efSShaohua Li struct mddev *mddev = log->rdev->mddev; 1062f6bed0efSShaohua Li 1063f6bed0efSShaohua Li log->rdev->journal_tail = cp; 1064f6bed0efSShaohua Li set_bit(MD_CHANGE_DEVS, &mddev->flags); 1065f6bed0efSShaohua Li } 1066f6bed0efSShaohua Li 1067f6bed0efSShaohua Li static int r5l_load_log(struct r5l_log *log) 1068f6bed0efSShaohua Li { 1069f6bed0efSShaohua Li struct md_rdev *rdev = log->rdev; 1070f6bed0efSShaohua Li struct page *page; 1071f6bed0efSShaohua Li struct r5l_meta_block *mb; 1072f6bed0efSShaohua Li sector_t cp = log->rdev->journal_tail; 1073f6bed0efSShaohua Li u32 stored_crc, expected_crc; 1074f6bed0efSShaohua Li bool create_super = false; 1075f6bed0efSShaohua Li int ret; 1076f6bed0efSShaohua Li 1077f6bed0efSShaohua Li /* Make sure it's valid */ 1078f6bed0efSShaohua Li if (cp >= rdev->sectors || round_down(cp, BLOCK_SECTORS) != cp) 1079f6bed0efSShaohua Li cp = 0; 1080f6bed0efSShaohua Li page = alloc_page(GFP_KERNEL); 1081f6bed0efSShaohua Li if (!page) 1082f6bed0efSShaohua Li return -ENOMEM; 1083f6bed0efSShaohua Li 1084f6bed0efSShaohua Li if (!sync_page_io(rdev, cp, PAGE_SIZE, page, READ, false)) { 1085f6bed0efSShaohua Li ret = -EIO; 1086f6bed0efSShaohua Li goto ioerr; 1087f6bed0efSShaohua Li } 1088f6bed0efSShaohua Li mb = page_address(page); 1089f6bed0efSShaohua Li 1090f6bed0efSShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 1091f6bed0efSShaohua Li mb->version != R5LOG_VERSION) { 1092f6bed0efSShaohua Li create_super = true; 1093f6bed0efSShaohua Li goto create; 1094f6bed0efSShaohua Li } 1095f6bed0efSShaohua Li stored_crc = le32_to_cpu(mb->checksum); 1096f6bed0efSShaohua Li mb->checksum = 0; 10975cb2fbd6SShaohua Li expected_crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 1098f6bed0efSShaohua Li if (stored_crc != expected_crc) { 1099f6bed0efSShaohua Li create_super = true; 1100f6bed0efSShaohua Li goto create; 1101f6bed0efSShaohua Li } 1102f6bed0efSShaohua Li if (le64_to_cpu(mb->position) != cp) { 1103f6bed0efSShaohua Li create_super = true; 1104f6bed0efSShaohua Li goto create; 1105f6bed0efSShaohua Li } 1106f6bed0efSShaohua Li create: 1107f6bed0efSShaohua Li if (create_super) { 1108f6bed0efSShaohua Li log->last_cp_seq = prandom_u32(); 1109f6bed0efSShaohua Li cp = 0; 1110f6bed0efSShaohua Li /* 1111f6bed0efSShaohua Li * Make sure super points to correct address. Log might have 1112f6bed0efSShaohua Li * data very soon. If super hasn't correct log tail address, 1113f6bed0efSShaohua Li * recovery can't find the log 1114f6bed0efSShaohua Li */ 1115f6bed0efSShaohua Li r5l_write_super(log, cp); 1116f6bed0efSShaohua Li } else 1117f6bed0efSShaohua Li log->last_cp_seq = le64_to_cpu(mb->seq); 1118f6bed0efSShaohua Li 1119f6bed0efSShaohua Li log->device_size = round_down(rdev->sectors, BLOCK_SECTORS); 11200576b1c6SShaohua Li log->max_free_space = log->device_size >> RECLAIM_MAX_FREE_SPACE_SHIFT; 11210576b1c6SShaohua Li if (log->max_free_space > RECLAIM_MAX_FREE_SPACE) 11220576b1c6SShaohua Li log->max_free_space = RECLAIM_MAX_FREE_SPACE; 1123f6bed0efSShaohua Li log->last_checkpoint = cp; 1124f6bed0efSShaohua Li 1125f6bed0efSShaohua Li __free_page(page); 1126f6bed0efSShaohua Li 1127f6bed0efSShaohua Li return r5l_recovery_log(log); 1128f6bed0efSShaohua Li ioerr: 1129f6bed0efSShaohua Li __free_page(page); 1130f6bed0efSShaohua Li return ret; 1131f6bed0efSShaohua Li } 1132f6bed0efSShaohua Li 1133f6bed0efSShaohua Li int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) 1134f6bed0efSShaohua Li { 1135f6bed0efSShaohua Li struct r5l_log *log; 1136f6bed0efSShaohua Li 1137f6bed0efSShaohua Li if (PAGE_SIZE != 4096) 1138f6bed0efSShaohua Li return -EINVAL; 1139f6bed0efSShaohua Li log = kzalloc(sizeof(*log), GFP_KERNEL); 1140f6bed0efSShaohua Li if (!log) 1141f6bed0efSShaohua Li return -ENOMEM; 1142f6bed0efSShaohua Li log->rdev = rdev; 1143f6bed0efSShaohua Li 114456fef7c6SChristoph Hellwig log->need_cache_flush = (rdev->bdev->bd_disk->queue->flush_flags != 0); 114556fef7c6SChristoph Hellwig 11465cb2fbd6SShaohua Li log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, 1147f6bed0efSShaohua Li sizeof(rdev->mddev->uuid)); 1148f6bed0efSShaohua Li 1149f6bed0efSShaohua Li mutex_init(&log->io_mutex); 1150f6bed0efSShaohua Li 1151f6bed0efSShaohua Li spin_lock_init(&log->io_list_lock); 1152f6bed0efSShaohua Li INIT_LIST_HEAD(&log->running_ios); 11530576b1c6SShaohua Li INIT_LIST_HEAD(&log->io_end_ios); 1154a8c34f91SShaohua Li INIT_LIST_HEAD(&log->flushing_ios); 115504732f74SChristoph Hellwig INIT_LIST_HEAD(&log->finished_ios); 1156a8c34f91SShaohua Li bio_init(&log->flush_bio); 1157f6bed0efSShaohua Li 1158f6bed0efSShaohua Li log->io_kc = KMEM_CACHE(r5l_io_unit, 0); 1159f6bed0efSShaohua Li if (!log->io_kc) 1160f6bed0efSShaohua Li goto io_kc; 1161f6bed0efSShaohua Li 11620576b1c6SShaohua Li log->reclaim_thread = md_register_thread(r5l_reclaim_thread, 11630576b1c6SShaohua Li log->rdev->mddev, "reclaim"); 11640576b1c6SShaohua Li if (!log->reclaim_thread) 11650576b1c6SShaohua Li goto reclaim_thread; 11660fd22b45SShaohua Li init_waitqueue_head(&log->iounit_wait); 11670576b1c6SShaohua Li 1168f6bed0efSShaohua Li INIT_LIST_HEAD(&log->no_space_stripes); 1169f6bed0efSShaohua Li spin_lock_init(&log->no_space_stripes_lock); 1170f6bed0efSShaohua Li 1171f6bed0efSShaohua Li if (r5l_load_log(log)) 1172f6bed0efSShaohua Li goto error; 1173f6bed0efSShaohua Li 1174f6bed0efSShaohua Li conf->log = log; 1175f6bed0efSShaohua Li return 0; 1176f6bed0efSShaohua Li error: 11770576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 11780576b1c6SShaohua Li reclaim_thread: 1179f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 1180f6bed0efSShaohua Li io_kc: 1181f6bed0efSShaohua Li kfree(log); 1182f6bed0efSShaohua Li return -EINVAL; 1183f6bed0efSShaohua Li } 1184f6bed0efSShaohua Li 1185f6bed0efSShaohua Li void r5l_exit_log(struct r5l_log *log) 1186f6bed0efSShaohua Li { 11870576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 1188f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 1189f6bed0efSShaohua Li kfree(log); 1190f6bed0efSShaohua Li } 1191