1f6bed0efSShaohua Li /* 2f6bed0efSShaohua Li * Copyright (C) 2015 Shaohua Li <shli@fb.com> 3b4c625c6SSong Liu * Copyright (C) 2016 Song Liu <songliubraving@fb.com> 4f6bed0efSShaohua Li * 5f6bed0efSShaohua Li * This program is free software; you can redistribute it and/or modify it 6f6bed0efSShaohua Li * under the terms and conditions of the GNU General Public License, 7f6bed0efSShaohua Li * version 2, as published by the Free Software Foundation. 8f6bed0efSShaohua Li * 9f6bed0efSShaohua Li * This program is distributed in the hope it will be useful, but WITHOUT 10f6bed0efSShaohua Li * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11f6bed0efSShaohua Li * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12f6bed0efSShaohua Li * more details. 13f6bed0efSShaohua Li * 14f6bed0efSShaohua Li */ 15f6bed0efSShaohua Li #include <linux/kernel.h> 16f6bed0efSShaohua Li #include <linux/wait.h> 17f6bed0efSShaohua Li #include <linux/blkdev.h> 18f6bed0efSShaohua Li #include <linux/slab.h> 19f6bed0efSShaohua Li #include <linux/raid/md_p.h> 205cb2fbd6SShaohua Li #include <linux/crc32c.h> 21f6bed0efSShaohua Li #include <linux/random.h> 22ce1ccd07SShaohua Li #include <linux/kthread.h> 2303b047f4SSong Liu #include <linux/types.h> 24f6bed0efSShaohua Li #include "md.h" 25f6bed0efSShaohua Li #include "raid5.h" 261e6d690bSSong Liu #include "bitmap.h" 27f6bed0efSShaohua Li 28f6bed0efSShaohua Li /* 29f6bed0efSShaohua Li * metadata/data stored in disk with 4k size unit (a block) regardless 30f6bed0efSShaohua Li * underneath hardware sector size. only works with PAGE_SIZE == 4096 31f6bed0efSShaohua Li */ 32f6bed0efSShaohua Li #define BLOCK_SECTORS (8) 33*effe6ee7SSong Liu #define BLOCK_SECTOR_SHIFT (3) 34f6bed0efSShaohua Li 350576b1c6SShaohua Li /* 36a39f7afdSSong Liu * log->max_free_space is min(1/4 disk size, 10G reclaimable space). 37a39f7afdSSong Liu * 38a39f7afdSSong Liu * In write through mode, the reclaim runs every log->max_free_space. 39a39f7afdSSong Liu * This can prevent the recovery scans for too long 400576b1c6SShaohua Li */ 410576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE (10 * 1024 * 1024 * 2) /* sector */ 420576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE_SHIFT (2) 430576b1c6SShaohua Li 44a39f7afdSSong Liu /* wake up reclaim thread periodically */ 45a39f7afdSSong Liu #define R5C_RECLAIM_WAKEUP_INTERVAL (30 * HZ) 46a39f7afdSSong Liu /* start flush with these full stripes */ 4784890c03SShaohua Li #define R5C_FULL_STRIPE_FLUSH_BATCH(conf) (conf->max_nr_stripes / 4) 48a39f7afdSSong Liu /* reclaim stripes in groups */ 49a39f7afdSSong Liu #define R5C_RECLAIM_STRIPE_GROUP (NR_STRIPE_HASH_LOCKS * 2) 50a39f7afdSSong Liu 51c38d29b3SChristoph Hellwig /* 52c38d29b3SChristoph Hellwig * We only need 2 bios per I/O unit to make progress, but ensure we 53c38d29b3SChristoph Hellwig * have a few more available to not get too tight. 54c38d29b3SChristoph Hellwig */ 55c38d29b3SChristoph Hellwig #define R5L_POOL_SIZE 4 56c38d29b3SChristoph Hellwig 572ded3703SSong Liu /* 582ded3703SSong Liu * r5c journal modes of the array: write-back or write-through. 592ded3703SSong Liu * write-through mode has identical behavior as existing log only 602ded3703SSong Liu * implementation. 612ded3703SSong Liu */ 622ded3703SSong Liu enum r5c_journal_mode { 632ded3703SSong Liu R5C_JOURNAL_MODE_WRITE_THROUGH = 0, 642ded3703SSong Liu R5C_JOURNAL_MODE_WRITE_BACK = 1, 652ded3703SSong Liu }; 662ded3703SSong Liu 672c7da14bSSong Liu static char *r5c_journal_mode_str[] = {"write-through", 682c7da14bSSong Liu "write-back"}; 692ded3703SSong Liu /* 702ded3703SSong Liu * raid5 cache state machine 712ded3703SSong Liu * 729b69173eSJackieLiu * With the RAID cache, each stripe works in two phases: 732ded3703SSong Liu * - caching phase 742ded3703SSong Liu * - writing-out phase 752ded3703SSong Liu * 762ded3703SSong Liu * These two phases are controlled by bit STRIPE_R5C_CACHING: 772ded3703SSong Liu * if STRIPE_R5C_CACHING == 0, the stripe is in writing-out phase 782ded3703SSong Liu * if STRIPE_R5C_CACHING == 1, the stripe is in caching phase 792ded3703SSong Liu * 802ded3703SSong Liu * When there is no journal, or the journal is in write-through mode, 812ded3703SSong Liu * the stripe is always in writing-out phase. 822ded3703SSong Liu * 832ded3703SSong Liu * For write-back journal, the stripe is sent to caching phase on write 842ded3703SSong Liu * (r5c_try_caching_write). r5c_make_stripe_write_out() kicks off 852ded3703SSong Liu * the write-out phase by clearing STRIPE_R5C_CACHING. 862ded3703SSong Liu * 872ded3703SSong Liu * Stripes in caching phase do not write the raid disks. Instead, all 882ded3703SSong Liu * writes are committed from the log device. Therefore, a stripe in 892ded3703SSong Liu * caching phase handles writes as: 902ded3703SSong Liu * - write to log device 912ded3703SSong Liu * - return IO 922ded3703SSong Liu * 932ded3703SSong Liu * Stripes in writing-out phase handle writes as: 942ded3703SSong Liu * - calculate parity 952ded3703SSong Liu * - write pending data and parity to journal 962ded3703SSong Liu * - write data and parity to raid disks 972ded3703SSong Liu * - return IO for pending writes 982ded3703SSong Liu */ 992ded3703SSong Liu 100f6bed0efSShaohua Li struct r5l_log { 101f6bed0efSShaohua Li struct md_rdev *rdev; 102f6bed0efSShaohua Li 103f6bed0efSShaohua Li u32 uuid_checksum; 104f6bed0efSShaohua Li 105f6bed0efSShaohua Li sector_t device_size; /* log device size, round to 106f6bed0efSShaohua Li * BLOCK_SECTORS */ 1070576b1c6SShaohua Li sector_t max_free_space; /* reclaim run if free space is at 1080576b1c6SShaohua Li * this size */ 109f6bed0efSShaohua Li 110f6bed0efSShaohua Li sector_t last_checkpoint; /* log tail. where recovery scan 111f6bed0efSShaohua Li * starts from */ 112f6bed0efSShaohua Li u64 last_cp_seq; /* log tail sequence */ 113f6bed0efSShaohua Li 114f6bed0efSShaohua Li sector_t log_start; /* log head. where new data appends */ 115f6bed0efSShaohua Li u64 seq; /* log head sequence */ 116f6bed0efSShaohua Li 11717036461SChristoph Hellwig sector_t next_checkpoint; 11817036461SChristoph Hellwig 119f6bed0efSShaohua Li struct mutex io_mutex; 120f6bed0efSShaohua Li struct r5l_io_unit *current_io; /* current io_unit accepting new data */ 121f6bed0efSShaohua Li 122f6bed0efSShaohua Li spinlock_t io_list_lock; 123f6bed0efSShaohua Li struct list_head running_ios; /* io_units which are still running, 124f6bed0efSShaohua Li * and have not yet been completely 125f6bed0efSShaohua Li * written to the log */ 126f6bed0efSShaohua Li struct list_head io_end_ios; /* io_units which have been completely 127f6bed0efSShaohua Li * written to the log but not yet written 128f6bed0efSShaohua Li * to the RAID */ 129a8c34f91SShaohua Li struct list_head flushing_ios; /* io_units which are waiting for log 130a8c34f91SShaohua Li * cache flush */ 13104732f74SChristoph Hellwig struct list_head finished_ios; /* io_units which settle down in log disk */ 132a8c34f91SShaohua Li struct bio flush_bio; 133f6bed0efSShaohua Li 1345036c390SChristoph Hellwig struct list_head no_mem_stripes; /* pending stripes, -ENOMEM */ 1355036c390SChristoph Hellwig 136f6bed0efSShaohua Li struct kmem_cache *io_kc; 1375036c390SChristoph Hellwig mempool_t *io_pool; 138c38d29b3SChristoph Hellwig struct bio_set *bs; 139e8deb638SChristoph Hellwig mempool_t *meta_pool; 140f6bed0efSShaohua Li 1410576b1c6SShaohua Li struct md_thread *reclaim_thread; 1420576b1c6SShaohua Li unsigned long reclaim_target; /* number of space that need to be 1430576b1c6SShaohua Li * reclaimed. if it's 0, reclaim spaces 1440576b1c6SShaohua Li * used by io_units which are in 1450576b1c6SShaohua Li * IO_UNIT_STRIPE_END state (eg, reclaim 1460576b1c6SShaohua Li * dones't wait for specific io_unit 1470576b1c6SShaohua Li * switching to IO_UNIT_STRIPE_END 1480576b1c6SShaohua Li * state) */ 1490fd22b45SShaohua Li wait_queue_head_t iounit_wait; 1500576b1c6SShaohua Li 151f6bed0efSShaohua Li struct list_head no_space_stripes; /* pending stripes, log has no space */ 152f6bed0efSShaohua Li spinlock_t no_space_stripes_lock; 15356fef7c6SChristoph Hellwig 15456fef7c6SChristoph Hellwig bool need_cache_flush; 1552ded3703SSong Liu 1562ded3703SSong Liu /* for r5c_cache */ 1572ded3703SSong Liu enum r5c_journal_mode r5c_journal_mode; 158a39f7afdSSong Liu 159a39f7afdSSong Liu /* all stripes in r5cache, in the order of seq at sh->log_start */ 160a39f7afdSSong Liu struct list_head stripe_in_journal_list; 161a39f7afdSSong Liu 162a39f7afdSSong Liu spinlock_t stripe_in_journal_lock; 163a39f7afdSSong Liu atomic_t stripe_in_journal_count; 1643bddb7f8SSong Liu 1653bddb7f8SSong Liu /* to submit async io_units, to fulfill ordering of flush */ 1663bddb7f8SSong Liu struct work_struct deferred_io_work; 1672e38a37fSSong Liu /* to disable write back during in degraded mode */ 1682e38a37fSSong Liu struct work_struct disable_writeback_work; 16903b047f4SSong Liu 17003b047f4SSong Liu /* to for chunk_aligned_read in writeback mode, details below */ 17103b047f4SSong Liu spinlock_t tree_lock; 17203b047f4SSong Liu struct radix_tree_root big_stripe_tree; 173f6bed0efSShaohua Li }; 174f6bed0efSShaohua Li 175f6bed0efSShaohua Li /* 17603b047f4SSong Liu * Enable chunk_aligned_read() with write back cache. 17703b047f4SSong Liu * 17803b047f4SSong Liu * Each chunk may contain more than one stripe (for example, a 256kB 17903b047f4SSong Liu * chunk contains 64 4kB-page, so this chunk contain 64 stripes). For 18003b047f4SSong Liu * chunk_aligned_read, these stripes are grouped into one "big_stripe". 18103b047f4SSong Liu * For each big_stripe, we count how many stripes of this big_stripe 18203b047f4SSong Liu * are in the write back cache. These data are tracked in a radix tree 18303b047f4SSong Liu * (big_stripe_tree). We use radix_tree item pointer as the counter. 18403b047f4SSong Liu * r5c_tree_index() is used to calculate keys for the radix tree. 18503b047f4SSong Liu * 18603b047f4SSong Liu * chunk_aligned_read() calls r5c_big_stripe_cached() to look up 18703b047f4SSong Liu * big_stripe of each chunk in the tree. If this big_stripe is in the 18803b047f4SSong Liu * tree, chunk_aligned_read() aborts. This look up is protected by 18903b047f4SSong Liu * rcu_read_lock(). 19003b047f4SSong Liu * 19103b047f4SSong Liu * It is necessary to remember whether a stripe is counted in 19203b047f4SSong Liu * big_stripe_tree. Instead of adding new flag, we reuses existing flags: 19303b047f4SSong Liu * STRIPE_R5C_PARTIAL_STRIPE and STRIPE_R5C_FULL_STRIPE. If either of these 19403b047f4SSong Liu * two flags are set, the stripe is counted in big_stripe_tree. This 19503b047f4SSong Liu * requires moving set_bit(STRIPE_R5C_PARTIAL_STRIPE) to 19603b047f4SSong Liu * r5c_try_caching_write(); and moving clear_bit of 19703b047f4SSong Liu * STRIPE_R5C_PARTIAL_STRIPE and STRIPE_R5C_FULL_STRIPE to 19803b047f4SSong Liu * r5c_finish_stripe_write_out(). 19903b047f4SSong Liu */ 20003b047f4SSong Liu 20103b047f4SSong Liu /* 20203b047f4SSong Liu * radix tree requests lowest 2 bits of data pointer to be 2b'00. 20303b047f4SSong Liu * So it is necessary to left shift the counter by 2 bits before using it 20403b047f4SSong Liu * as data pointer of the tree. 20503b047f4SSong Liu */ 20603b047f4SSong Liu #define R5C_RADIX_COUNT_SHIFT 2 20703b047f4SSong Liu 20803b047f4SSong Liu /* 20903b047f4SSong Liu * calculate key for big_stripe_tree 21003b047f4SSong Liu * 21103b047f4SSong Liu * sect: align_bi->bi_iter.bi_sector or sh->sector 21203b047f4SSong Liu */ 21303b047f4SSong Liu static inline sector_t r5c_tree_index(struct r5conf *conf, 21403b047f4SSong Liu sector_t sect) 21503b047f4SSong Liu { 21603b047f4SSong Liu sector_t offset; 21703b047f4SSong Liu 21803b047f4SSong Liu offset = sector_div(sect, conf->chunk_sectors); 21903b047f4SSong Liu return sect; 22003b047f4SSong Liu } 22103b047f4SSong Liu 22203b047f4SSong Liu /* 223f6bed0efSShaohua Li * an IO range starts from a meta data block and end at the next meta data 224f6bed0efSShaohua Li * block. The io unit's the meta data block tracks data/parity followed it. io 225f6bed0efSShaohua Li * unit is written to log disk with normal write, as we always flush log disk 226f6bed0efSShaohua Li * first and then start move data to raid disks, there is no requirement to 227f6bed0efSShaohua Li * write io unit with FLUSH/FUA 228f6bed0efSShaohua Li */ 229f6bed0efSShaohua Li struct r5l_io_unit { 230f6bed0efSShaohua Li struct r5l_log *log; 231f6bed0efSShaohua Li 232f6bed0efSShaohua Li struct page *meta_page; /* store meta block */ 233f6bed0efSShaohua Li int meta_offset; /* current offset in meta_page */ 234f6bed0efSShaohua Li 235f6bed0efSShaohua Li struct bio *current_bio;/* current_bio accepting new data */ 236f6bed0efSShaohua Li 237f6bed0efSShaohua Li atomic_t pending_stripe;/* how many stripes not flushed to raid */ 238f6bed0efSShaohua Li u64 seq; /* seq number of the metablock */ 239f6bed0efSShaohua Li sector_t log_start; /* where the io_unit starts */ 240f6bed0efSShaohua Li sector_t log_end; /* where the io_unit ends */ 241f6bed0efSShaohua Li struct list_head log_sibling; /* log->running_ios */ 242f6bed0efSShaohua Li struct list_head stripe_list; /* stripes added to the io_unit */ 243f6bed0efSShaohua Li 244f6bed0efSShaohua Li int state; 2456143e2ceSChristoph Hellwig bool need_split_bio; 2463bddb7f8SSong Liu struct bio *split_bio; 2473bddb7f8SSong Liu 2483bddb7f8SSong Liu unsigned int has_flush:1; /* include flush request */ 2493bddb7f8SSong Liu unsigned int has_fua:1; /* include fua request */ 2503bddb7f8SSong Liu unsigned int has_null_flush:1; /* include empty flush request */ 2513bddb7f8SSong Liu /* 2523bddb7f8SSong Liu * io isn't sent yet, flush/fua request can only be submitted till it's 2533bddb7f8SSong Liu * the first IO in running_ios list 2543bddb7f8SSong Liu */ 2553bddb7f8SSong Liu unsigned int io_deferred:1; 2563bddb7f8SSong Liu 2573bddb7f8SSong Liu struct bio_list flush_barriers; /* size == 0 flush bios */ 258f6bed0efSShaohua Li }; 259f6bed0efSShaohua Li 260f6bed0efSShaohua Li /* r5l_io_unit state */ 261f6bed0efSShaohua Li enum r5l_io_unit_state { 262f6bed0efSShaohua Li IO_UNIT_RUNNING = 0, /* accepting new IO */ 263f6bed0efSShaohua Li IO_UNIT_IO_START = 1, /* io_unit bio start writing to log, 264f6bed0efSShaohua Li * don't accepting new bio */ 265f6bed0efSShaohua Li IO_UNIT_IO_END = 2, /* io_unit bio finish writing to log */ 266a8c34f91SShaohua Li IO_UNIT_STRIPE_END = 3, /* stripes data finished writing to raid */ 267f6bed0efSShaohua Li }; 268f6bed0efSShaohua Li 2692ded3703SSong Liu bool r5c_is_writeback(struct r5l_log *log) 2702ded3703SSong Liu { 2712ded3703SSong Liu return (log != NULL && 2722ded3703SSong Liu log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK); 2732ded3703SSong Liu } 2742ded3703SSong Liu 275f6bed0efSShaohua Li static sector_t r5l_ring_add(struct r5l_log *log, sector_t start, sector_t inc) 276f6bed0efSShaohua Li { 277f6bed0efSShaohua Li start += inc; 278f6bed0efSShaohua Li if (start >= log->device_size) 279f6bed0efSShaohua Li start = start - log->device_size; 280f6bed0efSShaohua Li return start; 281f6bed0efSShaohua Li } 282f6bed0efSShaohua Li 283f6bed0efSShaohua Li static sector_t r5l_ring_distance(struct r5l_log *log, sector_t start, 284f6bed0efSShaohua Li sector_t end) 285f6bed0efSShaohua Li { 286f6bed0efSShaohua Li if (end >= start) 287f6bed0efSShaohua Li return end - start; 288f6bed0efSShaohua Li else 289f6bed0efSShaohua Li return end + log->device_size - start; 290f6bed0efSShaohua Li } 291f6bed0efSShaohua Li 292f6bed0efSShaohua Li static bool r5l_has_free_space(struct r5l_log *log, sector_t size) 293f6bed0efSShaohua Li { 294f6bed0efSShaohua Li sector_t used_size; 295f6bed0efSShaohua Li 296f6bed0efSShaohua Li used_size = r5l_ring_distance(log, log->last_checkpoint, 297f6bed0efSShaohua Li log->log_start); 298f6bed0efSShaohua Li 299f6bed0efSShaohua Li return log->device_size > used_size + size; 300f6bed0efSShaohua Li } 301f6bed0efSShaohua Li 302f6bed0efSShaohua Li static void __r5l_set_io_unit_state(struct r5l_io_unit *io, 303f6bed0efSShaohua Li enum r5l_io_unit_state state) 304f6bed0efSShaohua Li { 305f6bed0efSShaohua Li if (WARN_ON(io->state >= state)) 306f6bed0efSShaohua Li return; 307f6bed0efSShaohua Li io->state = state; 308f6bed0efSShaohua Li } 309f6bed0efSShaohua Li 3101e6d690bSSong Liu static void 3111e6d690bSSong Liu r5c_return_dev_pending_writes(struct r5conf *conf, struct r5dev *dev, 3121e6d690bSSong Liu struct bio_list *return_bi) 3131e6d690bSSong Liu { 3141e6d690bSSong Liu struct bio *wbi, *wbi2; 3151e6d690bSSong Liu 3161e6d690bSSong Liu wbi = dev->written; 3171e6d690bSSong Liu dev->written = NULL; 3181e6d690bSSong Liu while (wbi && wbi->bi_iter.bi_sector < 3191e6d690bSSong Liu dev->sector + STRIPE_SECTORS) { 3201e6d690bSSong Liu wbi2 = r5_next_bio(wbi, dev->sector); 3211e6d690bSSong Liu if (!raid5_dec_bi_active_stripes(wbi)) { 3221e6d690bSSong Liu md_write_end(conf->mddev); 3231e6d690bSSong Liu bio_list_add(return_bi, wbi); 3241e6d690bSSong Liu } 3251e6d690bSSong Liu wbi = wbi2; 3261e6d690bSSong Liu } 3271e6d690bSSong Liu } 3281e6d690bSSong Liu 3291e6d690bSSong Liu void r5c_handle_cached_data_endio(struct r5conf *conf, 3301e6d690bSSong Liu struct stripe_head *sh, int disks, struct bio_list *return_bi) 3311e6d690bSSong Liu { 3321e6d690bSSong Liu int i; 3331e6d690bSSong Liu 3341e6d690bSSong Liu for (i = sh->disks; i--; ) { 3351e6d690bSSong Liu if (sh->dev[i].written) { 3361e6d690bSSong Liu set_bit(R5_UPTODATE, &sh->dev[i].flags); 3371e6d690bSSong Liu r5c_return_dev_pending_writes(conf, &sh->dev[i], 3381e6d690bSSong Liu return_bi); 3391e6d690bSSong Liu bitmap_endwrite(conf->mddev->bitmap, sh->sector, 3401e6d690bSSong Liu STRIPE_SECTORS, 3411e6d690bSSong Liu !test_bit(STRIPE_DEGRADED, &sh->state), 3421e6d690bSSong Liu 0); 3431e6d690bSSong Liu } 3441e6d690bSSong Liu } 3451e6d690bSSong Liu } 3461e6d690bSSong Liu 347a39f7afdSSong Liu /* Check whether we should flush some stripes to free up stripe cache */ 348a39f7afdSSong Liu void r5c_check_stripe_cache_usage(struct r5conf *conf) 349a39f7afdSSong Liu { 350a39f7afdSSong Liu int total_cached; 351a39f7afdSSong Liu 352a39f7afdSSong Liu if (!r5c_is_writeback(conf->log)) 353a39f7afdSSong Liu return; 354a39f7afdSSong Liu 355a39f7afdSSong Liu total_cached = atomic_read(&conf->r5c_cached_partial_stripes) + 356a39f7afdSSong Liu atomic_read(&conf->r5c_cached_full_stripes); 357a39f7afdSSong Liu 358a39f7afdSSong Liu /* 359a39f7afdSSong Liu * The following condition is true for either of the following: 360a39f7afdSSong Liu * - stripe cache pressure high: 361a39f7afdSSong Liu * total_cached > 3/4 min_nr_stripes || 362a39f7afdSSong Liu * empty_inactive_list_nr > 0 363a39f7afdSSong Liu * - stripe cache pressure moderate: 364a39f7afdSSong Liu * total_cached > 1/2 min_nr_stripes 365a39f7afdSSong Liu */ 366a39f7afdSSong Liu if (total_cached > conf->min_nr_stripes * 1 / 2 || 367a39f7afdSSong Liu atomic_read(&conf->empty_inactive_list_nr) > 0) 368a39f7afdSSong Liu r5l_wake_reclaim(conf->log, 0); 369a39f7afdSSong Liu } 370a39f7afdSSong Liu 371a39f7afdSSong Liu /* 372a39f7afdSSong Liu * flush cache when there are R5C_FULL_STRIPE_FLUSH_BATCH or more full 373a39f7afdSSong Liu * stripes in the cache 374a39f7afdSSong Liu */ 375a39f7afdSSong Liu void r5c_check_cached_full_stripe(struct r5conf *conf) 376a39f7afdSSong Liu { 377a39f7afdSSong Liu if (!r5c_is_writeback(conf->log)) 378a39f7afdSSong Liu return; 379a39f7afdSSong Liu 380a39f7afdSSong Liu /* 381a39f7afdSSong Liu * wake up reclaim for R5C_FULL_STRIPE_FLUSH_BATCH cached stripes 382a39f7afdSSong Liu * or a full stripe (chunk size / 4k stripes). 383a39f7afdSSong Liu */ 384a39f7afdSSong Liu if (atomic_read(&conf->r5c_cached_full_stripes) >= 38584890c03SShaohua Li min(R5C_FULL_STRIPE_FLUSH_BATCH(conf), 386a39f7afdSSong Liu conf->chunk_sectors >> STRIPE_SHIFT)) 387a39f7afdSSong Liu r5l_wake_reclaim(conf->log, 0); 388a39f7afdSSong Liu } 389a39f7afdSSong Liu 390a39f7afdSSong Liu /* 391a39f7afdSSong Liu * Total log space (in sectors) needed to flush all data in cache 392a39f7afdSSong Liu * 39339b99586SSong Liu * To avoid deadlock due to log space, it is necessary to reserve log 39439b99586SSong Liu * space to flush critical stripes (stripes that occupying log space near 39539b99586SSong Liu * last_checkpoint). This function helps check how much log space is 39639b99586SSong Liu * required to flush all cached stripes. 397a39f7afdSSong Liu * 39839b99586SSong Liu * To reduce log space requirements, two mechanisms are used to give cache 39939b99586SSong Liu * flush higher priorities: 40039b99586SSong Liu * 1. In handle_stripe_dirtying() and schedule_reconstruction(), 40139b99586SSong Liu * stripes ALREADY in journal can be flushed w/o pending writes; 40239b99586SSong Liu * 2. In r5l_write_stripe() and r5c_cache_data(), stripes NOT in journal 40339b99586SSong Liu * can be delayed (r5l_add_no_space_stripe). 404a39f7afdSSong Liu * 40539b99586SSong Liu * In cache flush, the stripe goes through 1 and then 2. For a stripe that 40639b99586SSong Liu * already passed 1, flushing it requires at most (conf->max_degraded + 1) 40739b99586SSong Liu * pages of journal space. For stripes that has not passed 1, flushing it 40839b99586SSong Liu * requires (conf->raid_disks + 1) pages of journal space. There are at 40939b99586SSong Liu * most (conf->group_cnt + 1) stripe that passed 1. So total journal space 41039b99586SSong Liu * required to flush all cached stripes (in pages) is: 41139b99586SSong Liu * 41239b99586SSong Liu * (stripe_in_journal_count - group_cnt - 1) * (max_degraded + 1) + 41339b99586SSong Liu * (group_cnt + 1) * (raid_disks + 1) 41439b99586SSong Liu * or 41539b99586SSong Liu * (stripe_in_journal_count) * (max_degraded + 1) + 41639b99586SSong Liu * (group_cnt + 1) * (raid_disks - max_degraded) 417a39f7afdSSong Liu */ 418a39f7afdSSong Liu static sector_t r5c_log_required_to_flush_cache(struct r5conf *conf) 419a39f7afdSSong Liu { 420a39f7afdSSong Liu struct r5l_log *log = conf->log; 421a39f7afdSSong Liu 422a39f7afdSSong Liu if (!r5c_is_writeback(log)) 423a39f7afdSSong Liu return 0; 424a39f7afdSSong Liu 42539b99586SSong Liu return BLOCK_SECTORS * 42639b99586SSong Liu ((conf->max_degraded + 1) * atomic_read(&log->stripe_in_journal_count) + 42739b99586SSong Liu (conf->raid_disks - conf->max_degraded) * (conf->group_cnt + 1)); 428a39f7afdSSong Liu } 429a39f7afdSSong Liu 430a39f7afdSSong Liu /* 431a39f7afdSSong Liu * evaluate log space usage and update R5C_LOG_TIGHT and R5C_LOG_CRITICAL 432a39f7afdSSong Liu * 433a39f7afdSSong Liu * R5C_LOG_TIGHT is set when free space on the log device is less than 3x of 434a39f7afdSSong Liu * reclaim_required_space. R5C_LOG_CRITICAL is set when free space on the log 435a39f7afdSSong Liu * device is less than 2x of reclaim_required_space. 436a39f7afdSSong Liu */ 437a39f7afdSSong Liu static inline void r5c_update_log_state(struct r5l_log *log) 438a39f7afdSSong Liu { 439a39f7afdSSong Liu struct r5conf *conf = log->rdev->mddev->private; 440a39f7afdSSong Liu sector_t free_space; 441a39f7afdSSong Liu sector_t reclaim_space; 442f687a33eSSong Liu bool wake_reclaim = false; 443a39f7afdSSong Liu 444a39f7afdSSong Liu if (!r5c_is_writeback(log)) 445a39f7afdSSong Liu return; 446a39f7afdSSong Liu 447a39f7afdSSong Liu free_space = r5l_ring_distance(log, log->log_start, 448a39f7afdSSong Liu log->last_checkpoint); 449a39f7afdSSong Liu reclaim_space = r5c_log_required_to_flush_cache(conf); 450a39f7afdSSong Liu if (free_space < 2 * reclaim_space) 451a39f7afdSSong Liu set_bit(R5C_LOG_CRITICAL, &conf->cache_state); 452f687a33eSSong Liu else { 453f687a33eSSong Liu if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state)) 454f687a33eSSong Liu wake_reclaim = true; 455a39f7afdSSong Liu clear_bit(R5C_LOG_CRITICAL, &conf->cache_state); 456f687a33eSSong Liu } 457a39f7afdSSong Liu if (free_space < 3 * reclaim_space) 458a39f7afdSSong Liu set_bit(R5C_LOG_TIGHT, &conf->cache_state); 459a39f7afdSSong Liu else 460a39f7afdSSong Liu clear_bit(R5C_LOG_TIGHT, &conf->cache_state); 461f687a33eSSong Liu 462f687a33eSSong Liu if (wake_reclaim) 463f687a33eSSong Liu r5l_wake_reclaim(log, 0); 464a39f7afdSSong Liu } 465a39f7afdSSong Liu 4662ded3703SSong Liu /* 4672ded3703SSong Liu * Put the stripe into writing-out phase by clearing STRIPE_R5C_CACHING. 4682ded3703SSong Liu * This function should only be called in write-back mode. 4692ded3703SSong Liu */ 470a39f7afdSSong Liu void r5c_make_stripe_write_out(struct stripe_head *sh) 4712ded3703SSong Liu { 4722ded3703SSong Liu struct r5conf *conf = sh->raid_conf; 4732ded3703SSong Liu struct r5l_log *log = conf->log; 4742ded3703SSong Liu 4752ded3703SSong Liu BUG_ON(!r5c_is_writeback(log)); 4762ded3703SSong Liu 4772ded3703SSong Liu WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); 4782ded3703SSong Liu clear_bit(STRIPE_R5C_CACHING, &sh->state); 4791e6d690bSSong Liu 4801e6d690bSSong Liu if (!test_and_set_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) 4811e6d690bSSong Liu atomic_inc(&conf->preread_active_stripes); 4821e6d690bSSong Liu } 4831e6d690bSSong Liu 4841e6d690bSSong Liu static void r5c_handle_data_cached(struct stripe_head *sh) 4851e6d690bSSong Liu { 4861e6d690bSSong Liu int i; 4871e6d690bSSong Liu 4881e6d690bSSong Liu for (i = sh->disks; i--; ) 4891e6d690bSSong Liu if (test_and_clear_bit(R5_Wantwrite, &sh->dev[i].flags)) { 4901e6d690bSSong Liu set_bit(R5_InJournal, &sh->dev[i].flags); 4911e6d690bSSong Liu clear_bit(R5_LOCKED, &sh->dev[i].flags); 4921e6d690bSSong Liu } 4931e6d690bSSong Liu clear_bit(STRIPE_LOG_TRAPPED, &sh->state); 4941e6d690bSSong Liu } 4951e6d690bSSong Liu 4961e6d690bSSong Liu /* 4971e6d690bSSong Liu * this journal write must contain full parity, 4981e6d690bSSong Liu * it may also contain some data pages 4991e6d690bSSong Liu */ 5001e6d690bSSong Liu static void r5c_handle_parity_cached(struct stripe_head *sh) 5011e6d690bSSong Liu { 5021e6d690bSSong Liu int i; 5031e6d690bSSong Liu 5041e6d690bSSong Liu for (i = sh->disks; i--; ) 5051e6d690bSSong Liu if (test_bit(R5_InJournal, &sh->dev[i].flags)) 5061e6d690bSSong Liu set_bit(R5_Wantwrite, &sh->dev[i].flags); 5072ded3703SSong Liu } 5082ded3703SSong Liu 5092ded3703SSong Liu /* 5102ded3703SSong Liu * Setting proper flags after writing (or flushing) data and/or parity to the 5112ded3703SSong Liu * log device. This is called from r5l_log_endio() or r5l_log_flush_endio(). 5122ded3703SSong Liu */ 5132ded3703SSong Liu static void r5c_finish_cache_stripe(struct stripe_head *sh) 5142ded3703SSong Liu { 5152ded3703SSong Liu struct r5l_log *log = sh->raid_conf->log; 5162ded3703SSong Liu 5172ded3703SSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { 5182ded3703SSong Liu BUG_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); 5192ded3703SSong Liu /* 5202ded3703SSong Liu * Set R5_InJournal for parity dev[pd_idx]. This means 5212ded3703SSong Liu * all data AND parity in the journal. For RAID 6, it is 5222ded3703SSong Liu * NOT necessary to set the flag for dev[qd_idx], as the 5232ded3703SSong Liu * two parities are written out together. 5242ded3703SSong Liu */ 5252ded3703SSong Liu set_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); 5261e6d690bSSong Liu } else if (test_bit(STRIPE_R5C_CACHING, &sh->state)) { 5271e6d690bSSong Liu r5c_handle_data_cached(sh); 5281e6d690bSSong Liu } else { 5291e6d690bSSong Liu r5c_handle_parity_cached(sh); 5301e6d690bSSong Liu set_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); 5311e6d690bSSong Liu } 5322ded3703SSong Liu } 5332ded3703SSong Liu 534d8858f43SChristoph Hellwig static void r5l_io_run_stripes(struct r5l_io_unit *io) 535d8858f43SChristoph Hellwig { 536d8858f43SChristoph Hellwig struct stripe_head *sh, *next; 537d8858f43SChristoph Hellwig 538d8858f43SChristoph Hellwig list_for_each_entry_safe(sh, next, &io->stripe_list, log_list) { 539d8858f43SChristoph Hellwig list_del_init(&sh->log_list); 5402ded3703SSong Liu 5412ded3703SSong Liu r5c_finish_cache_stripe(sh); 5422ded3703SSong Liu 543d8858f43SChristoph Hellwig set_bit(STRIPE_HANDLE, &sh->state); 544d8858f43SChristoph Hellwig raid5_release_stripe(sh); 545d8858f43SChristoph Hellwig } 546d8858f43SChristoph Hellwig } 547d8858f43SChristoph Hellwig 54856fef7c6SChristoph Hellwig static void r5l_log_run_stripes(struct r5l_log *log) 54956fef7c6SChristoph Hellwig { 55056fef7c6SChristoph Hellwig struct r5l_io_unit *io, *next; 55156fef7c6SChristoph Hellwig 55256fef7c6SChristoph Hellwig assert_spin_locked(&log->io_list_lock); 55356fef7c6SChristoph Hellwig 55456fef7c6SChristoph Hellwig list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { 55556fef7c6SChristoph Hellwig /* don't change list order */ 55656fef7c6SChristoph Hellwig if (io->state < IO_UNIT_IO_END) 55756fef7c6SChristoph Hellwig break; 55856fef7c6SChristoph Hellwig 55956fef7c6SChristoph Hellwig list_move_tail(&io->log_sibling, &log->finished_ios); 56056fef7c6SChristoph Hellwig r5l_io_run_stripes(io); 56156fef7c6SChristoph Hellwig } 56256fef7c6SChristoph Hellwig } 56356fef7c6SChristoph Hellwig 5643848c0bcSChristoph Hellwig static void r5l_move_to_end_ios(struct r5l_log *log) 5653848c0bcSChristoph Hellwig { 5663848c0bcSChristoph Hellwig struct r5l_io_unit *io, *next; 5673848c0bcSChristoph Hellwig 5683848c0bcSChristoph Hellwig assert_spin_locked(&log->io_list_lock); 5693848c0bcSChristoph Hellwig 5703848c0bcSChristoph Hellwig list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { 5713848c0bcSChristoph Hellwig /* don't change list order */ 5723848c0bcSChristoph Hellwig if (io->state < IO_UNIT_IO_END) 5733848c0bcSChristoph Hellwig break; 5743848c0bcSChristoph Hellwig list_move_tail(&io->log_sibling, &log->io_end_ios); 5753848c0bcSChristoph Hellwig } 5763848c0bcSChristoph Hellwig } 5773848c0bcSChristoph Hellwig 5783bddb7f8SSong Liu static void __r5l_stripe_write_finished(struct r5l_io_unit *io); 579f6bed0efSShaohua Li static void r5l_log_endio(struct bio *bio) 580f6bed0efSShaohua Li { 581f6bed0efSShaohua Li struct r5l_io_unit *io = bio->bi_private; 5823bddb7f8SSong Liu struct r5l_io_unit *io_deferred; 583f6bed0efSShaohua Li struct r5l_log *log = io->log; 584509ffec7SChristoph Hellwig unsigned long flags; 585f6bed0efSShaohua Li 5866e74a9cfSShaohua Li if (bio->bi_error) 5876e74a9cfSShaohua Li md_error(log->rdev->mddev, log->rdev); 5886e74a9cfSShaohua Li 589f6bed0efSShaohua Li bio_put(bio); 590e8deb638SChristoph Hellwig mempool_free(io->meta_page, log->meta_pool); 591f6bed0efSShaohua Li 592509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 593509ffec7SChristoph Hellwig __r5l_set_io_unit_state(io, IO_UNIT_IO_END); 59456fef7c6SChristoph Hellwig if (log->need_cache_flush) 5953848c0bcSChristoph Hellwig r5l_move_to_end_ios(log); 59656fef7c6SChristoph Hellwig else 59756fef7c6SChristoph Hellwig r5l_log_run_stripes(log); 5983bddb7f8SSong Liu if (!list_empty(&log->running_ios)) { 5993bddb7f8SSong Liu /* 6003bddb7f8SSong Liu * FLUSH/FUA io_unit is deferred because of ordering, now we 6013bddb7f8SSong Liu * can dispatch it 6023bddb7f8SSong Liu */ 6033bddb7f8SSong Liu io_deferred = list_first_entry(&log->running_ios, 6043bddb7f8SSong Liu struct r5l_io_unit, log_sibling); 6053bddb7f8SSong Liu if (io_deferred->io_deferred) 6063bddb7f8SSong Liu schedule_work(&log->deferred_io_work); 6073bddb7f8SSong Liu } 6083bddb7f8SSong Liu 609509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 610509ffec7SChristoph Hellwig 61156fef7c6SChristoph Hellwig if (log->need_cache_flush) 612f6bed0efSShaohua Li md_wakeup_thread(log->rdev->mddev->thread); 6133bddb7f8SSong Liu 6143bddb7f8SSong Liu if (io->has_null_flush) { 6153bddb7f8SSong Liu struct bio *bi; 6163bddb7f8SSong Liu 6173bddb7f8SSong Liu WARN_ON(bio_list_empty(&io->flush_barriers)); 6183bddb7f8SSong Liu while ((bi = bio_list_pop(&io->flush_barriers)) != NULL) { 6193bddb7f8SSong Liu bio_endio(bi); 6203bddb7f8SSong Liu atomic_dec(&io->pending_stripe); 6213bddb7f8SSong Liu } 6223bddb7f8SSong Liu if (atomic_read(&io->pending_stripe) == 0) 6233bddb7f8SSong Liu __r5l_stripe_write_finished(io); 6243bddb7f8SSong Liu } 6253bddb7f8SSong Liu } 6263bddb7f8SSong Liu 6273bddb7f8SSong Liu static void r5l_do_submit_io(struct r5l_log *log, struct r5l_io_unit *io) 6283bddb7f8SSong Liu { 6293bddb7f8SSong Liu unsigned long flags; 6303bddb7f8SSong Liu 6313bddb7f8SSong Liu spin_lock_irqsave(&log->io_list_lock, flags); 6323bddb7f8SSong Liu __r5l_set_io_unit_state(io, IO_UNIT_IO_START); 6333bddb7f8SSong Liu spin_unlock_irqrestore(&log->io_list_lock, flags); 6343bddb7f8SSong Liu 6353bddb7f8SSong Liu if (io->has_flush) 63620737738SShaohua Li io->current_bio->bi_opf |= REQ_PREFLUSH; 6373bddb7f8SSong Liu if (io->has_fua) 63820737738SShaohua Li io->current_bio->bi_opf |= REQ_FUA; 6393bddb7f8SSong Liu submit_bio(io->current_bio); 6403bddb7f8SSong Liu 6413bddb7f8SSong Liu if (!io->split_bio) 6423bddb7f8SSong Liu return; 6433bddb7f8SSong Liu 6443bddb7f8SSong Liu if (io->has_flush) 64520737738SShaohua Li io->split_bio->bi_opf |= REQ_PREFLUSH; 6463bddb7f8SSong Liu if (io->has_fua) 64720737738SShaohua Li io->split_bio->bi_opf |= REQ_FUA; 6483bddb7f8SSong Liu submit_bio(io->split_bio); 6493bddb7f8SSong Liu } 6503bddb7f8SSong Liu 6513bddb7f8SSong Liu /* deferred io_unit will be dispatched here */ 6523bddb7f8SSong Liu static void r5l_submit_io_async(struct work_struct *work) 6533bddb7f8SSong Liu { 6543bddb7f8SSong Liu struct r5l_log *log = container_of(work, struct r5l_log, 6553bddb7f8SSong Liu deferred_io_work); 6563bddb7f8SSong Liu struct r5l_io_unit *io = NULL; 6573bddb7f8SSong Liu unsigned long flags; 6583bddb7f8SSong Liu 6593bddb7f8SSong Liu spin_lock_irqsave(&log->io_list_lock, flags); 6603bddb7f8SSong Liu if (!list_empty(&log->running_ios)) { 6613bddb7f8SSong Liu io = list_first_entry(&log->running_ios, struct r5l_io_unit, 6623bddb7f8SSong Liu log_sibling); 6633bddb7f8SSong Liu if (!io->io_deferred) 6643bddb7f8SSong Liu io = NULL; 6653bddb7f8SSong Liu else 6663bddb7f8SSong Liu io->io_deferred = 0; 6673bddb7f8SSong Liu } 6683bddb7f8SSong Liu spin_unlock_irqrestore(&log->io_list_lock, flags); 6693bddb7f8SSong Liu if (io) 6703bddb7f8SSong Liu r5l_do_submit_io(log, io); 671f6bed0efSShaohua Li } 672f6bed0efSShaohua Li 6732e38a37fSSong Liu static void r5c_disable_writeback_async(struct work_struct *work) 6742e38a37fSSong Liu { 6752e38a37fSSong Liu struct r5l_log *log = container_of(work, struct r5l_log, 6762e38a37fSSong Liu disable_writeback_work); 6772e38a37fSSong Liu struct mddev *mddev = log->rdev->mddev; 6782e38a37fSSong Liu 6792e38a37fSSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) 6802e38a37fSSong Liu return; 6812e38a37fSSong Liu pr_info("md/raid:%s: Disabling writeback cache for degraded array.\n", 6822e38a37fSSong Liu mdname(mddev)); 6832e38a37fSSong Liu mddev_suspend(mddev); 6842e38a37fSSong Liu log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; 6852e38a37fSSong Liu mddev_resume(mddev); 6862e38a37fSSong Liu } 6872e38a37fSSong Liu 688f6bed0efSShaohua Li static void r5l_submit_current_io(struct r5l_log *log) 689f6bed0efSShaohua Li { 690f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 6913bddb7f8SSong Liu struct bio *bio; 692f6bed0efSShaohua Li struct r5l_meta_block *block; 693509ffec7SChristoph Hellwig unsigned long flags; 694f6bed0efSShaohua Li u32 crc; 6953bddb7f8SSong Liu bool do_submit = true; 696f6bed0efSShaohua Li 697f6bed0efSShaohua Li if (!io) 698f6bed0efSShaohua Li return; 699f6bed0efSShaohua Li 700f6bed0efSShaohua Li block = page_address(io->meta_page); 701f6bed0efSShaohua Li block->meta_size = cpu_to_le32(io->meta_offset); 7025cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, block, PAGE_SIZE); 703f6bed0efSShaohua Li block->checksum = cpu_to_le32(crc); 7043bddb7f8SSong Liu bio = io->current_bio; 705f6bed0efSShaohua Li 706f6bed0efSShaohua Li log->current_io = NULL; 707509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 7083bddb7f8SSong Liu if (io->has_flush || io->has_fua) { 7093bddb7f8SSong Liu if (io != list_first_entry(&log->running_ios, 7103bddb7f8SSong Liu struct r5l_io_unit, log_sibling)) { 7113bddb7f8SSong Liu io->io_deferred = 1; 7123bddb7f8SSong Liu do_submit = false; 7133bddb7f8SSong Liu } 7143bddb7f8SSong Liu } 715509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 7163bddb7f8SSong Liu if (do_submit) 7173bddb7f8SSong Liu r5l_do_submit_io(log, io); 718f6bed0efSShaohua Li } 719f6bed0efSShaohua Li 7206143e2ceSChristoph Hellwig static struct bio *r5l_bio_alloc(struct r5l_log *log) 721b349feb3SChristoph Hellwig { 722c38d29b3SChristoph Hellwig struct bio *bio = bio_alloc_bioset(GFP_NOIO, BIO_MAX_PAGES, log->bs); 723b349feb3SChristoph Hellwig 724796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 725b349feb3SChristoph Hellwig bio->bi_bdev = log->rdev->bdev; 7261e932a37SChristoph Hellwig bio->bi_iter.bi_sector = log->rdev->data_offset + log->log_start; 727b349feb3SChristoph Hellwig 728b349feb3SChristoph Hellwig return bio; 729b349feb3SChristoph Hellwig } 730b349feb3SChristoph Hellwig 731c1b99198SChristoph Hellwig static void r5_reserve_log_entry(struct r5l_log *log, struct r5l_io_unit *io) 732c1b99198SChristoph Hellwig { 733c1b99198SChristoph Hellwig log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS); 734c1b99198SChristoph Hellwig 735a39f7afdSSong Liu r5c_update_log_state(log); 736c1b99198SChristoph Hellwig /* 737c1b99198SChristoph Hellwig * If we filled up the log device start from the beginning again, 738c1b99198SChristoph Hellwig * which will require a new bio. 739c1b99198SChristoph Hellwig * 740c1b99198SChristoph Hellwig * Note: for this to work properly the log size needs to me a multiple 741c1b99198SChristoph Hellwig * of BLOCK_SECTORS. 742c1b99198SChristoph Hellwig */ 743c1b99198SChristoph Hellwig if (log->log_start == 0) 7446143e2ceSChristoph Hellwig io->need_split_bio = true; 745c1b99198SChristoph Hellwig 746c1b99198SChristoph Hellwig io->log_end = log->log_start; 747c1b99198SChristoph Hellwig } 748c1b99198SChristoph Hellwig 749f6bed0efSShaohua Li static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) 750f6bed0efSShaohua Li { 751f6bed0efSShaohua Li struct r5l_io_unit *io; 752f6bed0efSShaohua Li struct r5l_meta_block *block; 753f6bed0efSShaohua Li 7545036c390SChristoph Hellwig io = mempool_alloc(log->io_pool, GFP_ATOMIC); 7555036c390SChristoph Hellwig if (!io) 7565036c390SChristoph Hellwig return NULL; 7575036c390SChristoph Hellwig memset(io, 0, sizeof(*io)); 7585036c390SChristoph Hellwig 75951039cd0SChristoph Hellwig io->log = log; 76051039cd0SChristoph Hellwig INIT_LIST_HEAD(&io->log_sibling); 76151039cd0SChristoph Hellwig INIT_LIST_HEAD(&io->stripe_list); 7623bddb7f8SSong Liu bio_list_init(&io->flush_barriers); 76351039cd0SChristoph Hellwig io->state = IO_UNIT_RUNNING; 764f6bed0efSShaohua Li 765e8deb638SChristoph Hellwig io->meta_page = mempool_alloc(log->meta_pool, GFP_NOIO); 766f6bed0efSShaohua Li block = page_address(io->meta_page); 767e8deb638SChristoph Hellwig clear_page(block); 768f6bed0efSShaohua Li block->magic = cpu_to_le32(R5LOG_MAGIC); 769f6bed0efSShaohua Li block->version = R5LOG_VERSION; 770f6bed0efSShaohua Li block->seq = cpu_to_le64(log->seq); 771f6bed0efSShaohua Li block->position = cpu_to_le64(log->log_start); 772f6bed0efSShaohua Li 773f6bed0efSShaohua Li io->log_start = log->log_start; 774f6bed0efSShaohua Li io->meta_offset = sizeof(struct r5l_meta_block); 7752b8ef16eSChristoph Hellwig io->seq = log->seq++; 776f6bed0efSShaohua Li 7776143e2ceSChristoph Hellwig io->current_bio = r5l_bio_alloc(log); 7786143e2ceSChristoph Hellwig io->current_bio->bi_end_io = r5l_log_endio; 7796143e2ceSChristoph Hellwig io->current_bio->bi_private = io; 780b349feb3SChristoph Hellwig bio_add_page(io->current_bio, io->meta_page, PAGE_SIZE, 0); 781f6bed0efSShaohua Li 782c1b99198SChristoph Hellwig r5_reserve_log_entry(log, io); 783f6bed0efSShaohua Li 784f6bed0efSShaohua Li spin_lock_irq(&log->io_list_lock); 785f6bed0efSShaohua Li list_add_tail(&io->log_sibling, &log->running_ios); 786f6bed0efSShaohua Li spin_unlock_irq(&log->io_list_lock); 787f6bed0efSShaohua Li 788f6bed0efSShaohua Li return io; 789f6bed0efSShaohua Li } 790f6bed0efSShaohua Li 791f6bed0efSShaohua Li static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size) 792f6bed0efSShaohua Li { 79322581f58SChristoph Hellwig if (log->current_io && 79422581f58SChristoph Hellwig log->current_io->meta_offset + payload_size > PAGE_SIZE) 795f6bed0efSShaohua Li r5l_submit_current_io(log); 796f6bed0efSShaohua Li 7975036c390SChristoph Hellwig if (!log->current_io) { 798f6bed0efSShaohua Li log->current_io = r5l_new_meta(log); 7995036c390SChristoph Hellwig if (!log->current_io) 8005036c390SChristoph Hellwig return -ENOMEM; 8015036c390SChristoph Hellwig } 8025036c390SChristoph Hellwig 803f6bed0efSShaohua Li return 0; 804f6bed0efSShaohua Li } 805f6bed0efSShaohua Li 806f6bed0efSShaohua Li static void r5l_append_payload_meta(struct r5l_log *log, u16 type, 807f6bed0efSShaohua Li sector_t location, 808f6bed0efSShaohua Li u32 checksum1, u32 checksum2, 809f6bed0efSShaohua Li bool checksum2_valid) 810f6bed0efSShaohua Li { 811f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 812f6bed0efSShaohua Li struct r5l_payload_data_parity *payload; 813f6bed0efSShaohua Li 814f6bed0efSShaohua Li payload = page_address(io->meta_page) + io->meta_offset; 815f6bed0efSShaohua Li payload->header.type = cpu_to_le16(type); 816f6bed0efSShaohua Li payload->header.flags = cpu_to_le16(0); 817f6bed0efSShaohua Li payload->size = cpu_to_le32((1 + !!checksum2_valid) << 818f6bed0efSShaohua Li (PAGE_SHIFT - 9)); 819f6bed0efSShaohua Li payload->location = cpu_to_le64(location); 820f6bed0efSShaohua Li payload->checksum[0] = cpu_to_le32(checksum1); 821f6bed0efSShaohua Li if (checksum2_valid) 822f6bed0efSShaohua Li payload->checksum[1] = cpu_to_le32(checksum2); 823f6bed0efSShaohua Li 824f6bed0efSShaohua Li io->meta_offset += sizeof(struct r5l_payload_data_parity) + 825f6bed0efSShaohua Li sizeof(__le32) * (1 + !!checksum2_valid); 826f6bed0efSShaohua Li } 827f6bed0efSShaohua Li 828f6bed0efSShaohua Li static void r5l_append_payload_page(struct r5l_log *log, struct page *page) 829f6bed0efSShaohua Li { 830f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 831f6bed0efSShaohua Li 8326143e2ceSChristoph Hellwig if (io->need_split_bio) { 8333bddb7f8SSong Liu BUG_ON(io->split_bio); 8343bddb7f8SSong Liu io->split_bio = io->current_bio; 8356143e2ceSChristoph Hellwig io->current_bio = r5l_bio_alloc(log); 8363bddb7f8SSong Liu bio_chain(io->current_bio, io->split_bio); 8373bddb7f8SSong Liu io->need_split_bio = false; 838f6bed0efSShaohua Li } 839f6bed0efSShaohua Li 8406143e2ceSChristoph Hellwig if (!bio_add_page(io->current_bio, page, PAGE_SIZE, 0)) 8416143e2ceSChristoph Hellwig BUG(); 8426143e2ceSChristoph Hellwig 843c1b99198SChristoph Hellwig r5_reserve_log_entry(log, io); 844f6bed0efSShaohua Li } 845f6bed0efSShaohua Li 8465036c390SChristoph Hellwig static int r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, 847f6bed0efSShaohua Li int data_pages, int parity_pages) 848f6bed0efSShaohua Li { 849f6bed0efSShaohua Li int i; 850f6bed0efSShaohua Li int meta_size; 8515036c390SChristoph Hellwig int ret; 852f6bed0efSShaohua Li struct r5l_io_unit *io; 853f6bed0efSShaohua Li 854f6bed0efSShaohua Li meta_size = 855f6bed0efSShaohua Li ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) 856f6bed0efSShaohua Li * data_pages) + 857f6bed0efSShaohua Li sizeof(struct r5l_payload_data_parity) + 858f6bed0efSShaohua Li sizeof(__le32) * parity_pages; 859f6bed0efSShaohua Li 8605036c390SChristoph Hellwig ret = r5l_get_meta(log, meta_size); 8615036c390SChristoph Hellwig if (ret) 8625036c390SChristoph Hellwig return ret; 8635036c390SChristoph Hellwig 864f6bed0efSShaohua Li io = log->current_io; 865f6bed0efSShaohua Li 8663bddb7f8SSong Liu if (test_and_clear_bit(STRIPE_R5C_PREFLUSH, &sh->state)) 8673bddb7f8SSong Liu io->has_flush = 1; 8683bddb7f8SSong Liu 869f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 8701e6d690bSSong Liu if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || 8711e6d690bSSong Liu test_bit(R5_InJournal, &sh->dev[i].flags)) 872f6bed0efSShaohua Li continue; 873f6bed0efSShaohua Li if (i == sh->pd_idx || i == sh->qd_idx) 874f6bed0efSShaohua Li continue; 8753bddb7f8SSong Liu if (test_bit(R5_WantFUA, &sh->dev[i].flags) && 8763bddb7f8SSong Liu log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) { 8773bddb7f8SSong Liu io->has_fua = 1; 8783bddb7f8SSong Liu /* 8793bddb7f8SSong Liu * we need to flush journal to make sure recovery can 8803bddb7f8SSong Liu * reach the data with fua flag 8813bddb7f8SSong Liu */ 8823bddb7f8SSong Liu io->has_flush = 1; 8833bddb7f8SSong Liu } 884f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_DATA, 885f6bed0efSShaohua Li raid5_compute_blocknr(sh, i, 0), 886f6bed0efSShaohua Li sh->dev[i].log_checksum, 0, false); 887f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[i].page); 888f6bed0efSShaohua Li } 889f6bed0efSShaohua Li 8902ded3703SSong Liu if (parity_pages == 2) { 891f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 892f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 893f6bed0efSShaohua Li sh->dev[sh->qd_idx].log_checksum, true); 894f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 895f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->qd_idx].page); 8962ded3703SSong Liu } else if (parity_pages == 1) { 897f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 898f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 899f6bed0efSShaohua Li 0, false); 900f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 9012ded3703SSong Liu } else /* Just writing data, not parity, in caching phase */ 9022ded3703SSong Liu BUG_ON(parity_pages != 0); 903f6bed0efSShaohua Li 904f6bed0efSShaohua Li list_add_tail(&sh->log_list, &io->stripe_list); 905f6bed0efSShaohua Li atomic_inc(&io->pending_stripe); 906f6bed0efSShaohua Li sh->log_io = io; 9075036c390SChristoph Hellwig 908a39f7afdSSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) 909a39f7afdSSong Liu return 0; 910a39f7afdSSong Liu 911a39f7afdSSong Liu if (sh->log_start == MaxSector) { 912a39f7afdSSong Liu BUG_ON(!list_empty(&sh->r5c)); 913a39f7afdSSong Liu sh->log_start = io->log_start; 914a39f7afdSSong Liu spin_lock_irq(&log->stripe_in_journal_lock); 915a39f7afdSSong Liu list_add_tail(&sh->r5c, 916a39f7afdSSong Liu &log->stripe_in_journal_list); 917a39f7afdSSong Liu spin_unlock_irq(&log->stripe_in_journal_lock); 918a39f7afdSSong Liu atomic_inc(&log->stripe_in_journal_count); 919a39f7afdSSong Liu } 9205036c390SChristoph Hellwig return 0; 921f6bed0efSShaohua Li } 922f6bed0efSShaohua Li 923a39f7afdSSong Liu /* add stripe to no_space_stripes, and then wake up reclaim */ 924a39f7afdSSong Liu static inline void r5l_add_no_space_stripe(struct r5l_log *log, 925a39f7afdSSong Liu struct stripe_head *sh) 926a39f7afdSSong Liu { 927a39f7afdSSong Liu spin_lock(&log->no_space_stripes_lock); 928a39f7afdSSong Liu list_add_tail(&sh->log_list, &log->no_space_stripes); 929a39f7afdSSong Liu spin_unlock(&log->no_space_stripes_lock); 930a39f7afdSSong Liu } 931a39f7afdSSong Liu 932f6bed0efSShaohua Li /* 933f6bed0efSShaohua Li * running in raid5d, where reclaim could wait for raid5d too (when it flushes 934f6bed0efSShaohua Li * data from log to raid disks), so we shouldn't wait for reclaim here 935f6bed0efSShaohua Li */ 936f6bed0efSShaohua Li int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh) 937f6bed0efSShaohua Li { 938a39f7afdSSong Liu struct r5conf *conf = sh->raid_conf; 939f6bed0efSShaohua Li int write_disks = 0; 940f6bed0efSShaohua Li int data_pages, parity_pages; 941f6bed0efSShaohua Li int reserve; 942f6bed0efSShaohua Li int i; 9435036c390SChristoph Hellwig int ret = 0; 944a39f7afdSSong Liu bool wake_reclaim = false; 945f6bed0efSShaohua Li 946f6bed0efSShaohua Li if (!log) 947f6bed0efSShaohua Li return -EAGAIN; 948f6bed0efSShaohua Li /* Don't support stripe batch */ 949f6bed0efSShaohua Li if (sh->log_io || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || 950f6bed0efSShaohua Li test_bit(STRIPE_SYNCING, &sh->state)) { 951f6bed0efSShaohua Li /* the stripe is written to log, we start writing it to raid */ 952f6bed0efSShaohua Li clear_bit(STRIPE_LOG_TRAPPED, &sh->state); 953f6bed0efSShaohua Li return -EAGAIN; 954f6bed0efSShaohua Li } 955f6bed0efSShaohua Li 9562ded3703SSong Liu WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); 9572ded3703SSong Liu 958f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 959f6bed0efSShaohua Li void *addr; 960f6bed0efSShaohua Li 9611e6d690bSSong Liu if (!test_bit(R5_Wantwrite, &sh->dev[i].flags) || 9621e6d690bSSong Liu test_bit(R5_InJournal, &sh->dev[i].flags)) 963f6bed0efSShaohua Li continue; 9641e6d690bSSong Liu 965f6bed0efSShaohua Li write_disks++; 966f6bed0efSShaohua Li /* checksum is already calculated in last run */ 967f6bed0efSShaohua Li if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) 968f6bed0efSShaohua Li continue; 969f6bed0efSShaohua Li addr = kmap_atomic(sh->dev[i].page); 9705cb2fbd6SShaohua Li sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, 971f6bed0efSShaohua Li addr, PAGE_SIZE); 972f6bed0efSShaohua Li kunmap_atomic(addr); 973f6bed0efSShaohua Li } 974f6bed0efSShaohua Li parity_pages = 1 + !!(sh->qd_idx >= 0); 975f6bed0efSShaohua Li data_pages = write_disks - parity_pages; 976f6bed0efSShaohua Li 977f6bed0efSShaohua Li set_bit(STRIPE_LOG_TRAPPED, &sh->state); 978253f9fd4SShaohua Li /* 979253f9fd4SShaohua Li * The stripe must enter state machine again to finish the write, so 980253f9fd4SShaohua Li * don't delay. 981253f9fd4SShaohua Li */ 982253f9fd4SShaohua Li clear_bit(STRIPE_DELAYED, &sh->state); 983f6bed0efSShaohua Li atomic_inc(&sh->count); 984f6bed0efSShaohua Li 985f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 986f6bed0efSShaohua Li /* meta + data */ 987f6bed0efSShaohua Li reserve = (1 + write_disks) << (PAGE_SHIFT - 9); 988f6bed0efSShaohua Li 989a39f7afdSSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { 990a39f7afdSSong Liu if (!r5l_has_free_space(log, reserve)) { 991a39f7afdSSong Liu r5l_add_no_space_stripe(log, sh); 992a39f7afdSSong Liu wake_reclaim = true; 9935036c390SChristoph Hellwig } else { 9945036c390SChristoph Hellwig ret = r5l_log_stripe(log, sh, data_pages, parity_pages); 9955036c390SChristoph Hellwig if (ret) { 9965036c390SChristoph Hellwig spin_lock_irq(&log->io_list_lock); 997a39f7afdSSong Liu list_add_tail(&sh->log_list, 998a39f7afdSSong Liu &log->no_mem_stripes); 9995036c390SChristoph Hellwig spin_unlock_irq(&log->io_list_lock); 1000f6bed0efSShaohua Li } 10015036c390SChristoph Hellwig } 1002a39f7afdSSong Liu } else { /* R5C_JOURNAL_MODE_WRITE_BACK */ 1003a39f7afdSSong Liu /* 1004a39f7afdSSong Liu * log space critical, do not process stripes that are 1005a39f7afdSSong Liu * not in cache yet (sh->log_start == MaxSector). 1006a39f7afdSSong Liu */ 1007a39f7afdSSong Liu if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && 1008a39f7afdSSong Liu sh->log_start == MaxSector) { 1009a39f7afdSSong Liu r5l_add_no_space_stripe(log, sh); 1010a39f7afdSSong Liu wake_reclaim = true; 1011a39f7afdSSong Liu reserve = 0; 1012a39f7afdSSong Liu } else if (!r5l_has_free_space(log, reserve)) { 1013a39f7afdSSong Liu if (sh->log_start == log->last_checkpoint) 1014a39f7afdSSong Liu BUG(); 1015a39f7afdSSong Liu else 1016a39f7afdSSong Liu r5l_add_no_space_stripe(log, sh); 1017a39f7afdSSong Liu } else { 1018a39f7afdSSong Liu ret = r5l_log_stripe(log, sh, data_pages, parity_pages); 1019a39f7afdSSong Liu if (ret) { 1020a39f7afdSSong Liu spin_lock_irq(&log->io_list_lock); 1021a39f7afdSSong Liu list_add_tail(&sh->log_list, 1022a39f7afdSSong Liu &log->no_mem_stripes); 1023a39f7afdSSong Liu spin_unlock_irq(&log->io_list_lock); 1024a39f7afdSSong Liu } 1025a39f7afdSSong Liu } 1026a39f7afdSSong Liu } 1027f6bed0efSShaohua Li 10285036c390SChristoph Hellwig mutex_unlock(&log->io_mutex); 1029a39f7afdSSong Liu if (wake_reclaim) 1030a39f7afdSSong Liu r5l_wake_reclaim(log, reserve); 1031f6bed0efSShaohua Li return 0; 1032f6bed0efSShaohua Li } 1033f6bed0efSShaohua Li 1034f6bed0efSShaohua Li void r5l_write_stripe_run(struct r5l_log *log) 1035f6bed0efSShaohua Li { 1036f6bed0efSShaohua Li if (!log) 1037f6bed0efSShaohua Li return; 1038f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 1039f6bed0efSShaohua Li r5l_submit_current_io(log); 1040f6bed0efSShaohua Li mutex_unlock(&log->io_mutex); 1041f6bed0efSShaohua Li } 1042f6bed0efSShaohua Li 1043828cbe98SShaohua Li int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio) 1044828cbe98SShaohua Li { 1045828cbe98SShaohua Li if (!log) 1046828cbe98SShaohua Li return -ENODEV; 10473bddb7f8SSong Liu 10483bddb7f8SSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) { 1049828cbe98SShaohua Li /* 10503bddb7f8SSong Liu * in write through (journal only) 10513bddb7f8SSong Liu * we flush log disk cache first, then write stripe data to 10523bddb7f8SSong Liu * raid disks. So if bio is finished, the log disk cache is 10533bddb7f8SSong Liu * flushed already. The recovery guarantees we can recovery 10543bddb7f8SSong Liu * the bio from log disk, so we don't need to flush again 1055828cbe98SShaohua Li */ 1056828cbe98SShaohua Li if (bio->bi_iter.bi_size == 0) { 1057828cbe98SShaohua Li bio_endio(bio); 1058828cbe98SShaohua Li return 0; 1059828cbe98SShaohua Li } 10601eff9d32SJens Axboe bio->bi_opf &= ~REQ_PREFLUSH; 10613bddb7f8SSong Liu } else { 10623bddb7f8SSong Liu /* write back (with cache) */ 10633bddb7f8SSong Liu if (bio->bi_iter.bi_size == 0) { 10643bddb7f8SSong Liu mutex_lock(&log->io_mutex); 10653bddb7f8SSong Liu r5l_get_meta(log, 0); 10663bddb7f8SSong Liu bio_list_add(&log->current_io->flush_barriers, bio); 10673bddb7f8SSong Liu log->current_io->has_flush = 1; 10683bddb7f8SSong Liu log->current_io->has_null_flush = 1; 10693bddb7f8SSong Liu atomic_inc(&log->current_io->pending_stripe); 10703bddb7f8SSong Liu r5l_submit_current_io(log); 10713bddb7f8SSong Liu mutex_unlock(&log->io_mutex); 10723bddb7f8SSong Liu return 0; 10733bddb7f8SSong Liu } 10743bddb7f8SSong Liu } 1075828cbe98SShaohua Li return -EAGAIN; 1076828cbe98SShaohua Li } 1077828cbe98SShaohua Li 1078f6bed0efSShaohua Li /* This will run after log space is reclaimed */ 1079f6bed0efSShaohua Li static void r5l_run_no_space_stripes(struct r5l_log *log) 1080f6bed0efSShaohua Li { 1081f6bed0efSShaohua Li struct stripe_head *sh; 1082f6bed0efSShaohua Li 1083f6bed0efSShaohua Li spin_lock(&log->no_space_stripes_lock); 1084f6bed0efSShaohua Li while (!list_empty(&log->no_space_stripes)) { 1085f6bed0efSShaohua Li sh = list_first_entry(&log->no_space_stripes, 1086f6bed0efSShaohua Li struct stripe_head, log_list); 1087f6bed0efSShaohua Li list_del_init(&sh->log_list); 1088f6bed0efSShaohua Li set_bit(STRIPE_HANDLE, &sh->state); 1089f6bed0efSShaohua Li raid5_release_stripe(sh); 1090f6bed0efSShaohua Li } 1091f6bed0efSShaohua Li spin_unlock(&log->no_space_stripes_lock); 1092f6bed0efSShaohua Li } 1093f6bed0efSShaohua Li 1094a39f7afdSSong Liu /* 1095a39f7afdSSong Liu * calculate new last_checkpoint 1096a39f7afdSSong Liu * for write through mode, returns log->next_checkpoint 1097a39f7afdSSong Liu * for write back, returns log_start of first sh in stripe_in_journal_list 1098a39f7afdSSong Liu */ 1099a39f7afdSSong Liu static sector_t r5c_calculate_new_cp(struct r5conf *conf) 1100a39f7afdSSong Liu { 1101a39f7afdSSong Liu struct stripe_head *sh; 1102a39f7afdSSong Liu struct r5l_log *log = conf->log; 1103a39f7afdSSong Liu sector_t new_cp; 1104a39f7afdSSong Liu unsigned long flags; 1105a39f7afdSSong Liu 1106a39f7afdSSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) 1107a39f7afdSSong Liu return log->next_checkpoint; 1108a39f7afdSSong Liu 1109a39f7afdSSong Liu spin_lock_irqsave(&log->stripe_in_journal_lock, flags); 1110a39f7afdSSong Liu if (list_empty(&conf->log->stripe_in_journal_list)) { 1111a39f7afdSSong Liu /* all stripes flushed */ 1112d3014e21SDan Carpenter spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); 1113a39f7afdSSong Liu return log->next_checkpoint; 1114a39f7afdSSong Liu } 1115a39f7afdSSong Liu sh = list_first_entry(&conf->log->stripe_in_journal_list, 1116a39f7afdSSong Liu struct stripe_head, r5c); 1117a39f7afdSSong Liu new_cp = sh->log_start; 1118a39f7afdSSong Liu spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); 1119a39f7afdSSong Liu return new_cp; 1120a39f7afdSSong Liu } 1121a39f7afdSSong Liu 112217036461SChristoph Hellwig static sector_t r5l_reclaimable_space(struct r5l_log *log) 112317036461SChristoph Hellwig { 1124a39f7afdSSong Liu struct r5conf *conf = log->rdev->mddev->private; 1125a39f7afdSSong Liu 112617036461SChristoph Hellwig return r5l_ring_distance(log, log->last_checkpoint, 1127a39f7afdSSong Liu r5c_calculate_new_cp(conf)); 112817036461SChristoph Hellwig } 112917036461SChristoph Hellwig 11305036c390SChristoph Hellwig static void r5l_run_no_mem_stripe(struct r5l_log *log) 11315036c390SChristoph Hellwig { 11325036c390SChristoph Hellwig struct stripe_head *sh; 11335036c390SChristoph Hellwig 11345036c390SChristoph Hellwig assert_spin_locked(&log->io_list_lock); 11355036c390SChristoph Hellwig 11365036c390SChristoph Hellwig if (!list_empty(&log->no_mem_stripes)) { 11375036c390SChristoph Hellwig sh = list_first_entry(&log->no_mem_stripes, 11385036c390SChristoph Hellwig struct stripe_head, log_list); 11395036c390SChristoph Hellwig list_del_init(&sh->log_list); 11405036c390SChristoph Hellwig set_bit(STRIPE_HANDLE, &sh->state); 11415036c390SChristoph Hellwig raid5_release_stripe(sh); 11425036c390SChristoph Hellwig } 11435036c390SChristoph Hellwig } 11445036c390SChristoph Hellwig 114504732f74SChristoph Hellwig static bool r5l_complete_finished_ios(struct r5l_log *log) 114617036461SChristoph Hellwig { 114717036461SChristoph Hellwig struct r5l_io_unit *io, *next; 114817036461SChristoph Hellwig bool found = false; 114917036461SChristoph Hellwig 115017036461SChristoph Hellwig assert_spin_locked(&log->io_list_lock); 115117036461SChristoph Hellwig 115204732f74SChristoph Hellwig list_for_each_entry_safe(io, next, &log->finished_ios, log_sibling) { 115317036461SChristoph Hellwig /* don't change list order */ 115417036461SChristoph Hellwig if (io->state < IO_UNIT_STRIPE_END) 115517036461SChristoph Hellwig break; 115617036461SChristoph Hellwig 115717036461SChristoph Hellwig log->next_checkpoint = io->log_start; 115817036461SChristoph Hellwig 115917036461SChristoph Hellwig list_del(&io->log_sibling); 11605036c390SChristoph Hellwig mempool_free(io, log->io_pool); 11615036c390SChristoph Hellwig r5l_run_no_mem_stripe(log); 116217036461SChristoph Hellwig 116317036461SChristoph Hellwig found = true; 116417036461SChristoph Hellwig } 116517036461SChristoph Hellwig 116617036461SChristoph Hellwig return found; 116717036461SChristoph Hellwig } 116817036461SChristoph Hellwig 1169509ffec7SChristoph Hellwig static void __r5l_stripe_write_finished(struct r5l_io_unit *io) 1170509ffec7SChristoph Hellwig { 1171509ffec7SChristoph Hellwig struct r5l_log *log = io->log; 1172a39f7afdSSong Liu struct r5conf *conf = log->rdev->mddev->private; 1173509ffec7SChristoph Hellwig unsigned long flags; 1174509ffec7SChristoph Hellwig 1175509ffec7SChristoph Hellwig spin_lock_irqsave(&log->io_list_lock, flags); 1176509ffec7SChristoph Hellwig __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); 117717036461SChristoph Hellwig 117804732f74SChristoph Hellwig if (!r5l_complete_finished_ios(log)) { 117985f2f9a4SShaohua Li spin_unlock_irqrestore(&log->io_list_lock, flags); 118085f2f9a4SShaohua Li return; 118185f2f9a4SShaohua Li } 1182509ffec7SChristoph Hellwig 1183a39f7afdSSong Liu if (r5l_reclaimable_space(log) > log->max_free_space || 1184a39f7afdSSong Liu test_bit(R5C_LOG_TIGHT, &conf->cache_state)) 1185509ffec7SChristoph Hellwig r5l_wake_reclaim(log, 0); 1186509ffec7SChristoph Hellwig 1187509ffec7SChristoph Hellwig spin_unlock_irqrestore(&log->io_list_lock, flags); 1188509ffec7SChristoph Hellwig wake_up(&log->iounit_wait); 1189509ffec7SChristoph Hellwig } 1190509ffec7SChristoph Hellwig 11910576b1c6SShaohua Li void r5l_stripe_write_finished(struct stripe_head *sh) 11920576b1c6SShaohua Li { 11930576b1c6SShaohua Li struct r5l_io_unit *io; 11940576b1c6SShaohua Li 11950576b1c6SShaohua Li io = sh->log_io; 11960576b1c6SShaohua Li sh->log_io = NULL; 11970576b1c6SShaohua Li 1198509ffec7SChristoph Hellwig if (io && atomic_dec_and_test(&io->pending_stripe)) 1199509ffec7SChristoph Hellwig __r5l_stripe_write_finished(io); 12000576b1c6SShaohua Li } 12010576b1c6SShaohua Li 1202a8c34f91SShaohua Li static void r5l_log_flush_endio(struct bio *bio) 1203a8c34f91SShaohua Li { 1204a8c34f91SShaohua Li struct r5l_log *log = container_of(bio, struct r5l_log, 1205a8c34f91SShaohua Li flush_bio); 1206a8c34f91SShaohua Li unsigned long flags; 1207a8c34f91SShaohua Li struct r5l_io_unit *io; 1208a8c34f91SShaohua Li 12096e74a9cfSShaohua Li if (bio->bi_error) 12106e74a9cfSShaohua Li md_error(log->rdev->mddev, log->rdev); 12116e74a9cfSShaohua Li 1212a8c34f91SShaohua Li spin_lock_irqsave(&log->io_list_lock, flags); 1213d8858f43SChristoph Hellwig list_for_each_entry(io, &log->flushing_ios, log_sibling) 1214d8858f43SChristoph Hellwig r5l_io_run_stripes(io); 121504732f74SChristoph Hellwig list_splice_tail_init(&log->flushing_ios, &log->finished_ios); 1216a8c34f91SShaohua Li spin_unlock_irqrestore(&log->io_list_lock, flags); 1217a8c34f91SShaohua Li } 1218a8c34f91SShaohua Li 12190576b1c6SShaohua Li /* 12200576b1c6SShaohua Li * Starting dispatch IO to raid. 12210576b1c6SShaohua Li * io_unit(meta) consists of a log. There is one situation we want to avoid. A 12220576b1c6SShaohua Li * broken meta in the middle of a log causes recovery can't find meta at the 12230576b1c6SShaohua Li * head of log. If operations require meta at the head persistent in log, we 12240576b1c6SShaohua Li * must make sure meta before it persistent in log too. A case is: 12250576b1c6SShaohua Li * 12260576b1c6SShaohua Li * stripe data/parity is in log, we start write stripe to raid disks. stripe 12270576b1c6SShaohua Li * data/parity must be persistent in log before we do the write to raid disks. 12280576b1c6SShaohua Li * 12290576b1c6SShaohua Li * The solution is we restrictly maintain io_unit list order. In this case, we 12300576b1c6SShaohua Li * only write stripes of an io_unit to raid disks till the io_unit is the first 12310576b1c6SShaohua Li * one whose data/parity is in log. 12320576b1c6SShaohua Li */ 12330576b1c6SShaohua Li void r5l_flush_stripe_to_raid(struct r5l_log *log) 12340576b1c6SShaohua Li { 1235a8c34f91SShaohua Li bool do_flush; 123656fef7c6SChristoph Hellwig 123756fef7c6SChristoph Hellwig if (!log || !log->need_cache_flush) 12380576b1c6SShaohua Li return; 12390576b1c6SShaohua Li 1240a8c34f91SShaohua Li spin_lock_irq(&log->io_list_lock); 1241a8c34f91SShaohua Li /* flush bio is running */ 1242a8c34f91SShaohua Li if (!list_empty(&log->flushing_ios)) { 1243a8c34f91SShaohua Li spin_unlock_irq(&log->io_list_lock); 12440576b1c6SShaohua Li return; 12450576b1c6SShaohua Li } 1246a8c34f91SShaohua Li list_splice_tail_init(&log->io_end_ios, &log->flushing_ios); 1247a8c34f91SShaohua Li do_flush = !list_empty(&log->flushing_ios); 12480576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 1249a8c34f91SShaohua Li 1250a8c34f91SShaohua Li if (!do_flush) 1251a8c34f91SShaohua Li return; 1252a8c34f91SShaohua Li bio_reset(&log->flush_bio); 1253a8c34f91SShaohua Li log->flush_bio.bi_bdev = log->rdev->bdev; 1254a8c34f91SShaohua Li log->flush_bio.bi_end_io = r5l_log_flush_endio; 125570fd7614SChristoph Hellwig log->flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; 12564e49ea4aSMike Christie submit_bio(&log->flush_bio); 12570576b1c6SShaohua Li } 12580576b1c6SShaohua Li 12590576b1c6SShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp); 12604b482044SShaohua Li static void r5l_write_super_and_discard_space(struct r5l_log *log, 12614b482044SShaohua Li sector_t end) 12624b482044SShaohua Li { 12634b482044SShaohua Li struct block_device *bdev = log->rdev->bdev; 12644b482044SShaohua Li struct mddev *mddev; 12654b482044SShaohua Li 12664b482044SShaohua Li r5l_write_super(log, end); 12674b482044SShaohua Li 12684b482044SShaohua Li if (!blk_queue_discard(bdev_get_queue(bdev))) 12694b482044SShaohua Li return; 12704b482044SShaohua Li 12714b482044SShaohua Li mddev = log->rdev->mddev; 12724b482044SShaohua Li /* 12738e018c21SShaohua Li * Discard could zero data, so before discard we must make sure 12748e018c21SShaohua Li * superblock is updated to new log tail. Updating superblock (either 12758e018c21SShaohua Li * directly call md_update_sb() or depend on md thread) must hold 12768e018c21SShaohua Li * reconfig mutex. On the other hand, raid5_quiesce is called with 12778e018c21SShaohua Li * reconfig_mutex hold. The first step of raid5_quiesce() is waitting 12788e018c21SShaohua Li * for all IO finish, hence waitting for reclaim thread, while reclaim 12798e018c21SShaohua Li * thread is calling this function and waitting for reconfig mutex. So 12808e018c21SShaohua Li * there is a deadlock. We workaround this issue with a trylock. 12818e018c21SShaohua Li * FIXME: we could miss discard if we can't take reconfig mutex 12824b482044SShaohua Li */ 12832953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 12842953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 12858e018c21SShaohua Li if (!mddev_trylock(mddev)) 12868e018c21SShaohua Li return; 12874b482044SShaohua Li md_update_sb(mddev, 1); 12888e018c21SShaohua Li mddev_unlock(mddev); 12894b482044SShaohua Li 12906e74a9cfSShaohua Li /* discard IO error really doesn't matter, ignore it */ 12914b482044SShaohua Li if (log->last_checkpoint < end) { 12924b482044SShaohua Li blkdev_issue_discard(bdev, 12934b482044SShaohua Li log->last_checkpoint + log->rdev->data_offset, 12944b482044SShaohua Li end - log->last_checkpoint, GFP_NOIO, 0); 12954b482044SShaohua Li } else { 12964b482044SShaohua Li blkdev_issue_discard(bdev, 12974b482044SShaohua Li log->last_checkpoint + log->rdev->data_offset, 12984b482044SShaohua Li log->device_size - log->last_checkpoint, 12994b482044SShaohua Li GFP_NOIO, 0); 13004b482044SShaohua Li blkdev_issue_discard(bdev, log->rdev->data_offset, end, 13014b482044SShaohua Li GFP_NOIO, 0); 13024b482044SShaohua Li } 13034b482044SShaohua Li } 13044b482044SShaohua Li 1305a39f7afdSSong Liu /* 1306a39f7afdSSong Liu * r5c_flush_stripe moves stripe from cached list to handle_list. When called, 1307a39f7afdSSong Liu * the stripe must be on r5c_cached_full_stripes or r5c_cached_partial_stripes. 1308a39f7afdSSong Liu * 1309a39f7afdSSong Liu * must hold conf->device_lock 1310a39f7afdSSong Liu */ 1311a39f7afdSSong Liu static void r5c_flush_stripe(struct r5conf *conf, struct stripe_head *sh) 1312a39f7afdSSong Liu { 1313a39f7afdSSong Liu BUG_ON(list_empty(&sh->lru)); 1314a39f7afdSSong Liu BUG_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); 1315a39f7afdSSong Liu BUG_ON(test_bit(STRIPE_HANDLE, &sh->state)); 1316a39f7afdSSong Liu 1317a39f7afdSSong Liu /* 1318a39f7afdSSong Liu * The stripe is not ON_RELEASE_LIST, so it is safe to call 1319a39f7afdSSong Liu * raid5_release_stripe() while holding conf->device_lock 1320a39f7afdSSong Liu */ 1321a39f7afdSSong Liu BUG_ON(test_bit(STRIPE_ON_RELEASE_LIST, &sh->state)); 1322a39f7afdSSong Liu assert_spin_locked(&conf->device_lock); 1323a39f7afdSSong Liu 1324a39f7afdSSong Liu list_del_init(&sh->lru); 1325a39f7afdSSong Liu atomic_inc(&sh->count); 1326a39f7afdSSong Liu 1327a39f7afdSSong Liu set_bit(STRIPE_HANDLE, &sh->state); 1328a39f7afdSSong Liu atomic_inc(&conf->active_stripes); 1329a39f7afdSSong Liu r5c_make_stripe_write_out(sh); 1330a39f7afdSSong Liu 1331e33fbb9cSShaohua Li if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) 1332e33fbb9cSShaohua Li atomic_inc(&conf->r5c_flushing_partial_stripes); 1333e33fbb9cSShaohua Li else 1334e33fbb9cSShaohua Li atomic_inc(&conf->r5c_flushing_full_stripes); 1335a39f7afdSSong Liu raid5_release_stripe(sh); 1336a39f7afdSSong Liu } 1337a39f7afdSSong Liu 1338a39f7afdSSong Liu /* 1339a39f7afdSSong Liu * if num == 0, flush all full stripes 1340a39f7afdSSong Liu * if num > 0, flush all full stripes. If less than num full stripes are 1341a39f7afdSSong Liu * flushed, flush some partial stripes until totally num stripes are 1342a39f7afdSSong Liu * flushed or there is no more cached stripes. 1343a39f7afdSSong Liu */ 1344a39f7afdSSong Liu void r5c_flush_cache(struct r5conf *conf, int num) 1345a39f7afdSSong Liu { 1346a39f7afdSSong Liu int count; 1347a39f7afdSSong Liu struct stripe_head *sh, *next; 1348a39f7afdSSong Liu 1349a39f7afdSSong Liu assert_spin_locked(&conf->device_lock); 1350a39f7afdSSong Liu if (!conf->log) 1351a39f7afdSSong Liu return; 1352a39f7afdSSong Liu 1353a39f7afdSSong Liu count = 0; 1354a39f7afdSSong Liu list_for_each_entry_safe(sh, next, &conf->r5c_full_stripe_list, lru) { 1355a39f7afdSSong Liu r5c_flush_stripe(conf, sh); 1356a39f7afdSSong Liu count++; 1357a39f7afdSSong Liu } 1358a39f7afdSSong Liu 1359a39f7afdSSong Liu if (count >= num) 1360a39f7afdSSong Liu return; 1361a39f7afdSSong Liu list_for_each_entry_safe(sh, next, 1362a39f7afdSSong Liu &conf->r5c_partial_stripe_list, lru) { 1363a39f7afdSSong Liu r5c_flush_stripe(conf, sh); 1364a39f7afdSSong Liu if (++count >= num) 1365a39f7afdSSong Liu break; 1366a39f7afdSSong Liu } 1367a39f7afdSSong Liu } 1368a39f7afdSSong Liu 1369a39f7afdSSong Liu static void r5c_do_reclaim(struct r5conf *conf) 1370a39f7afdSSong Liu { 1371a39f7afdSSong Liu struct r5l_log *log = conf->log; 1372a39f7afdSSong Liu struct stripe_head *sh; 1373a39f7afdSSong Liu int count = 0; 1374a39f7afdSSong Liu unsigned long flags; 1375a39f7afdSSong Liu int total_cached; 1376a39f7afdSSong Liu int stripes_to_flush; 1377e33fbb9cSShaohua Li int flushing_partial, flushing_full; 1378a39f7afdSSong Liu 1379a39f7afdSSong Liu if (!r5c_is_writeback(log)) 1380a39f7afdSSong Liu return; 1381a39f7afdSSong Liu 1382e33fbb9cSShaohua Li flushing_partial = atomic_read(&conf->r5c_flushing_partial_stripes); 1383e33fbb9cSShaohua Li flushing_full = atomic_read(&conf->r5c_flushing_full_stripes); 1384a39f7afdSSong Liu total_cached = atomic_read(&conf->r5c_cached_partial_stripes) + 1385e33fbb9cSShaohua Li atomic_read(&conf->r5c_cached_full_stripes) - 1386e33fbb9cSShaohua Li flushing_full - flushing_partial; 1387a39f7afdSSong Liu 1388a39f7afdSSong Liu if (total_cached > conf->min_nr_stripes * 3 / 4 || 1389a39f7afdSSong Liu atomic_read(&conf->empty_inactive_list_nr) > 0) 1390a39f7afdSSong Liu /* 1391a39f7afdSSong Liu * if stripe cache pressure high, flush all full stripes and 1392a39f7afdSSong Liu * some partial stripes 1393a39f7afdSSong Liu */ 1394a39f7afdSSong Liu stripes_to_flush = R5C_RECLAIM_STRIPE_GROUP; 1395a39f7afdSSong Liu else if (total_cached > conf->min_nr_stripes * 1 / 2 || 1396e33fbb9cSShaohua Li atomic_read(&conf->r5c_cached_full_stripes) - flushing_full > 139784890c03SShaohua Li R5C_FULL_STRIPE_FLUSH_BATCH(conf)) 1398a39f7afdSSong Liu /* 1399a39f7afdSSong Liu * if stripe cache pressure moderate, or if there is many full 1400a39f7afdSSong Liu * stripes,flush all full stripes 1401a39f7afdSSong Liu */ 1402a39f7afdSSong Liu stripes_to_flush = 0; 1403a39f7afdSSong Liu else 1404a39f7afdSSong Liu /* no need to flush */ 1405a39f7afdSSong Liu stripes_to_flush = -1; 1406a39f7afdSSong Liu 1407a39f7afdSSong Liu if (stripes_to_flush >= 0) { 1408a39f7afdSSong Liu spin_lock_irqsave(&conf->device_lock, flags); 1409a39f7afdSSong Liu r5c_flush_cache(conf, stripes_to_flush); 1410a39f7afdSSong Liu spin_unlock_irqrestore(&conf->device_lock, flags); 1411a39f7afdSSong Liu } 1412a39f7afdSSong Liu 1413a39f7afdSSong Liu /* if log space is tight, flush stripes on stripe_in_journal_list */ 1414a39f7afdSSong Liu if (test_bit(R5C_LOG_TIGHT, &conf->cache_state)) { 1415a39f7afdSSong Liu spin_lock_irqsave(&log->stripe_in_journal_lock, flags); 1416a39f7afdSSong Liu spin_lock(&conf->device_lock); 1417a39f7afdSSong Liu list_for_each_entry(sh, &log->stripe_in_journal_list, r5c) { 1418a39f7afdSSong Liu /* 1419a39f7afdSSong Liu * stripes on stripe_in_journal_list could be in any 1420a39f7afdSSong Liu * state of the stripe_cache state machine. In this 1421a39f7afdSSong Liu * case, we only want to flush stripe on 1422a39f7afdSSong Liu * r5c_cached_full/partial_stripes. The following 1423a39f7afdSSong Liu * condition makes sure the stripe is on one of the 1424a39f7afdSSong Liu * two lists. 1425a39f7afdSSong Liu */ 1426a39f7afdSSong Liu if (!list_empty(&sh->lru) && 1427a39f7afdSSong Liu !test_bit(STRIPE_HANDLE, &sh->state) && 1428a39f7afdSSong Liu atomic_read(&sh->count) == 0) { 1429a39f7afdSSong Liu r5c_flush_stripe(conf, sh); 1430a39f7afdSSong Liu if (count++ >= R5C_RECLAIM_STRIPE_GROUP) 1431a39f7afdSSong Liu break; 1432a39f7afdSSong Liu } 1433e8fd52eeSShaohua Li } 1434a39f7afdSSong Liu spin_unlock(&conf->device_lock); 1435a39f7afdSSong Liu spin_unlock_irqrestore(&log->stripe_in_journal_lock, flags); 1436a39f7afdSSong Liu } 1437f687a33eSSong Liu 1438f687a33eSSong Liu if (!test_bit(R5C_LOG_CRITICAL, &conf->cache_state)) 1439f687a33eSSong Liu r5l_run_no_space_stripes(log); 1440f687a33eSSong Liu 1441a39f7afdSSong Liu md_wakeup_thread(conf->mddev->thread); 1442a39f7afdSSong Liu } 14434b482044SShaohua Li 14440576b1c6SShaohua Li static void r5l_do_reclaim(struct r5l_log *log) 14450576b1c6SShaohua Li { 1446a39f7afdSSong Liu struct r5conf *conf = log->rdev->mddev->private; 14470576b1c6SShaohua Li sector_t reclaim_target = xchg(&log->reclaim_target, 0); 144817036461SChristoph Hellwig sector_t reclaimable; 144917036461SChristoph Hellwig sector_t next_checkpoint; 1450a39f7afdSSong Liu bool write_super; 14510576b1c6SShaohua Li 14520576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 1453a39f7afdSSong Liu write_super = r5l_reclaimable_space(log) > log->max_free_space || 1454a39f7afdSSong Liu reclaim_target != 0 || !list_empty(&log->no_space_stripes); 14550576b1c6SShaohua Li /* 14560576b1c6SShaohua Li * move proper io_unit to reclaim list. We should not change the order. 14570576b1c6SShaohua Li * reclaimable/unreclaimable io_unit can be mixed in the list, we 14580576b1c6SShaohua Li * shouldn't reuse space of an unreclaimable io_unit 14590576b1c6SShaohua Li */ 14600576b1c6SShaohua Li while (1) { 146117036461SChristoph Hellwig reclaimable = r5l_reclaimable_space(log); 146217036461SChristoph Hellwig if (reclaimable >= reclaim_target || 14630576b1c6SShaohua Li (list_empty(&log->running_ios) && 14640576b1c6SShaohua Li list_empty(&log->io_end_ios) && 1465a8c34f91SShaohua Li list_empty(&log->flushing_ios) && 146604732f74SChristoph Hellwig list_empty(&log->finished_ios))) 14670576b1c6SShaohua Li break; 14680576b1c6SShaohua Li 146917036461SChristoph Hellwig md_wakeup_thread(log->rdev->mddev->thread); 147017036461SChristoph Hellwig wait_event_lock_irq(log->iounit_wait, 147117036461SChristoph Hellwig r5l_reclaimable_space(log) > reclaimable, 147217036461SChristoph Hellwig log->io_list_lock); 14730576b1c6SShaohua Li } 147417036461SChristoph Hellwig 1475a39f7afdSSong Liu next_checkpoint = r5c_calculate_new_cp(conf); 14760576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 14770576b1c6SShaohua Li 1478a39f7afdSSong Liu if (reclaimable == 0 || !write_super) 14790576b1c6SShaohua Li return; 14800576b1c6SShaohua Li 14810576b1c6SShaohua Li /* 14820576b1c6SShaohua Li * write_super will flush cache of each raid disk. We must write super 14830576b1c6SShaohua Li * here, because the log area might be reused soon and we don't want to 14840576b1c6SShaohua Li * confuse recovery 14850576b1c6SShaohua Li */ 14864b482044SShaohua Li r5l_write_super_and_discard_space(log, next_checkpoint); 14870576b1c6SShaohua Li 14880576b1c6SShaohua Li mutex_lock(&log->io_mutex); 148917036461SChristoph Hellwig log->last_checkpoint = next_checkpoint; 1490a39f7afdSSong Liu r5c_update_log_state(log); 14910576b1c6SShaohua Li mutex_unlock(&log->io_mutex); 14920576b1c6SShaohua Li 149317036461SChristoph Hellwig r5l_run_no_space_stripes(log); 14940576b1c6SShaohua Li } 14950576b1c6SShaohua Li 14960576b1c6SShaohua Li static void r5l_reclaim_thread(struct md_thread *thread) 14970576b1c6SShaohua Li { 14980576b1c6SShaohua Li struct mddev *mddev = thread->mddev; 14990576b1c6SShaohua Li struct r5conf *conf = mddev->private; 15000576b1c6SShaohua Li struct r5l_log *log = conf->log; 15010576b1c6SShaohua Li 15020576b1c6SShaohua Li if (!log) 15030576b1c6SShaohua Li return; 1504a39f7afdSSong Liu r5c_do_reclaim(conf); 15050576b1c6SShaohua Li r5l_do_reclaim(log); 15060576b1c6SShaohua Li } 15070576b1c6SShaohua Li 1508a39f7afdSSong Liu void r5l_wake_reclaim(struct r5l_log *log, sector_t space) 1509f6bed0efSShaohua Li { 15100576b1c6SShaohua Li unsigned long target; 15110576b1c6SShaohua Li unsigned long new = (unsigned long)space; /* overflow in theory */ 15120576b1c6SShaohua Li 1513a39f7afdSSong Liu if (!log) 1514a39f7afdSSong Liu return; 15150576b1c6SShaohua Li do { 15160576b1c6SShaohua Li target = log->reclaim_target; 15170576b1c6SShaohua Li if (new < target) 15180576b1c6SShaohua Li return; 15190576b1c6SShaohua Li } while (cmpxchg(&log->reclaim_target, target, new) != target); 15200576b1c6SShaohua Li md_wakeup_thread(log->reclaim_thread); 1521f6bed0efSShaohua Li } 1522f6bed0efSShaohua Li 1523e6c033f7SShaohua Li void r5l_quiesce(struct r5l_log *log, int state) 1524e6c033f7SShaohua Li { 15254b482044SShaohua Li struct mddev *mddev; 1526e6c033f7SShaohua Li if (!log || state == 2) 1527e6c033f7SShaohua Li return; 1528ce1ccd07SShaohua Li if (state == 0) 1529ce1ccd07SShaohua Li kthread_unpark(log->reclaim_thread->tsk); 1530ce1ccd07SShaohua Li else if (state == 1) { 15314b482044SShaohua Li /* make sure r5l_write_super_and_discard_space exits */ 15324b482044SShaohua Li mddev = log->rdev->mddev; 15334b482044SShaohua Li wake_up(&mddev->sb_wait); 1534ce1ccd07SShaohua Li kthread_park(log->reclaim_thread->tsk); 1535a39f7afdSSong Liu r5l_wake_reclaim(log, MaxSector); 1536e6c033f7SShaohua Li r5l_do_reclaim(log); 1537e6c033f7SShaohua Li } 1538e6c033f7SShaohua Li } 1539e6c033f7SShaohua Li 15406e74a9cfSShaohua Li bool r5l_log_disk_error(struct r5conf *conf) 15416e74a9cfSShaohua Li { 1542f6b6ec5cSShaohua Li struct r5l_log *log; 1543f6b6ec5cSShaohua Li bool ret; 15447dde2ad3SShaohua Li /* don't allow write if journal disk is missing */ 1545f6b6ec5cSShaohua Li rcu_read_lock(); 1546f6b6ec5cSShaohua Li log = rcu_dereference(conf->log); 1547f6b6ec5cSShaohua Li 1548f6b6ec5cSShaohua Li if (!log) 1549f6b6ec5cSShaohua Li ret = test_bit(MD_HAS_JOURNAL, &conf->mddev->flags); 1550f6b6ec5cSShaohua Li else 1551f6b6ec5cSShaohua Li ret = test_bit(Faulty, &log->rdev->flags); 1552f6b6ec5cSShaohua Li rcu_read_unlock(); 1553f6b6ec5cSShaohua Li return ret; 15546e74a9cfSShaohua Li } 15556e74a9cfSShaohua Li 1556*effe6ee7SSong Liu #define R5L_RECOVERY_PAGE_POOL_SIZE 256 1557*effe6ee7SSong Liu 1558355810d1SShaohua Li struct r5l_recovery_ctx { 1559355810d1SShaohua Li struct page *meta_page; /* current meta */ 1560355810d1SShaohua Li sector_t meta_total_blocks; /* total size of current meta and data */ 1561355810d1SShaohua Li sector_t pos; /* recovery position */ 1562355810d1SShaohua Li u64 seq; /* recovery position seq */ 1563b4c625c6SSong Liu int data_parity_stripes; /* number of data_parity stripes */ 1564b4c625c6SSong Liu int data_only_stripes; /* number of data_only stripes */ 1565b4c625c6SSong Liu struct list_head cached_list; 1566*effe6ee7SSong Liu 1567*effe6ee7SSong Liu /* 1568*effe6ee7SSong Liu * read ahead page pool (ra_pool) 1569*effe6ee7SSong Liu * in recovery, log is read sequentially. It is not efficient to 1570*effe6ee7SSong Liu * read every page with sync_page_io(). The read ahead page pool 1571*effe6ee7SSong Liu * reads multiple pages with one IO, so further log read can 1572*effe6ee7SSong Liu * just copy data from the pool. 1573*effe6ee7SSong Liu */ 1574*effe6ee7SSong Liu struct page *ra_pool[R5L_RECOVERY_PAGE_POOL_SIZE]; 1575*effe6ee7SSong Liu sector_t pool_offset; /* offset of first page in the pool */ 1576*effe6ee7SSong Liu int total_pages; /* total allocated pages */ 1577*effe6ee7SSong Liu int valid_pages; /* pages with valid data */ 1578*effe6ee7SSong Liu struct bio *ra_bio; /* bio to do the read ahead */ 1579355810d1SShaohua Li }; 1580355810d1SShaohua Li 1581*effe6ee7SSong Liu static int r5l_recovery_allocate_ra_pool(struct r5l_log *log, 1582*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx) 1583*effe6ee7SSong Liu { 1584*effe6ee7SSong Liu struct page *page; 1585*effe6ee7SSong Liu 1586*effe6ee7SSong Liu ctx->ra_bio = bio_alloc_bioset(GFP_KERNEL, BIO_MAX_PAGES, log->bs); 1587*effe6ee7SSong Liu if (!ctx->ra_bio) 1588*effe6ee7SSong Liu return -ENOMEM; 1589*effe6ee7SSong Liu 1590*effe6ee7SSong Liu ctx->valid_pages = 0; 1591*effe6ee7SSong Liu ctx->total_pages = 0; 1592*effe6ee7SSong Liu while (ctx->total_pages < R5L_RECOVERY_PAGE_POOL_SIZE) { 1593*effe6ee7SSong Liu page = alloc_page(GFP_KERNEL); 1594*effe6ee7SSong Liu 1595*effe6ee7SSong Liu if (!page) 1596*effe6ee7SSong Liu break; 1597*effe6ee7SSong Liu ctx->ra_pool[ctx->total_pages] = page; 1598*effe6ee7SSong Liu ctx->total_pages += 1; 1599*effe6ee7SSong Liu } 1600*effe6ee7SSong Liu 1601*effe6ee7SSong Liu if (ctx->total_pages == 0) { 1602*effe6ee7SSong Liu bio_put(ctx->ra_bio); 1603*effe6ee7SSong Liu return -ENOMEM; 1604*effe6ee7SSong Liu } 1605*effe6ee7SSong Liu 1606*effe6ee7SSong Liu ctx->pool_offset = 0; 1607*effe6ee7SSong Liu return 0; 1608*effe6ee7SSong Liu } 1609*effe6ee7SSong Liu 1610*effe6ee7SSong Liu static void r5l_recovery_free_ra_pool(struct r5l_log *log, 1611*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx) 1612*effe6ee7SSong Liu { 1613*effe6ee7SSong Liu int i; 1614*effe6ee7SSong Liu 1615*effe6ee7SSong Liu for (i = 0; i < ctx->total_pages; ++i) 1616*effe6ee7SSong Liu put_page(ctx->ra_pool[i]); 1617*effe6ee7SSong Liu bio_put(ctx->ra_bio); 1618*effe6ee7SSong Liu } 1619*effe6ee7SSong Liu 1620*effe6ee7SSong Liu /* 1621*effe6ee7SSong Liu * fetch ctx->valid_pages pages from offset 1622*effe6ee7SSong Liu * In normal cases, ctx->valid_pages == ctx->total_pages after the call. 1623*effe6ee7SSong Liu * However, if the offset is close to the end of the journal device, 1624*effe6ee7SSong Liu * ctx->valid_pages could be smaller than ctx->total_pages 1625*effe6ee7SSong Liu */ 1626*effe6ee7SSong Liu static int r5l_recovery_fetch_ra_pool(struct r5l_log *log, 1627*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx, 1628*effe6ee7SSong Liu sector_t offset) 1629*effe6ee7SSong Liu { 1630*effe6ee7SSong Liu bio_reset(ctx->ra_bio); 1631*effe6ee7SSong Liu ctx->ra_bio->bi_bdev = log->rdev->bdev; 1632*effe6ee7SSong Liu bio_set_op_attrs(ctx->ra_bio, REQ_OP_READ, 0); 1633*effe6ee7SSong Liu ctx->ra_bio->bi_iter.bi_sector = log->rdev->data_offset + offset; 1634*effe6ee7SSong Liu 1635*effe6ee7SSong Liu ctx->valid_pages = 0; 1636*effe6ee7SSong Liu ctx->pool_offset = offset; 1637*effe6ee7SSong Liu 1638*effe6ee7SSong Liu while (ctx->valid_pages < ctx->total_pages) { 1639*effe6ee7SSong Liu bio_add_page(ctx->ra_bio, 1640*effe6ee7SSong Liu ctx->ra_pool[ctx->valid_pages], PAGE_SIZE, 0); 1641*effe6ee7SSong Liu ctx->valid_pages += 1; 1642*effe6ee7SSong Liu 1643*effe6ee7SSong Liu offset = r5l_ring_add(log, offset, BLOCK_SECTORS); 1644*effe6ee7SSong Liu 1645*effe6ee7SSong Liu if (offset == 0) /* reached end of the device */ 1646*effe6ee7SSong Liu break; 1647*effe6ee7SSong Liu } 1648*effe6ee7SSong Liu 1649*effe6ee7SSong Liu return submit_bio_wait(ctx->ra_bio); 1650*effe6ee7SSong Liu } 1651*effe6ee7SSong Liu 1652*effe6ee7SSong Liu /* 1653*effe6ee7SSong Liu * try read a page from the read ahead page pool, if the page is not in the 1654*effe6ee7SSong Liu * pool, call r5l_recovery_fetch_ra_pool 1655*effe6ee7SSong Liu */ 1656*effe6ee7SSong Liu static int r5l_recovery_read_page(struct r5l_log *log, 1657*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx, 1658*effe6ee7SSong Liu struct page *page, 1659*effe6ee7SSong Liu sector_t offset) 1660*effe6ee7SSong Liu { 1661*effe6ee7SSong Liu int ret; 1662*effe6ee7SSong Liu 1663*effe6ee7SSong Liu if (offset < ctx->pool_offset || 1664*effe6ee7SSong Liu offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS) { 1665*effe6ee7SSong Liu ret = r5l_recovery_fetch_ra_pool(log, ctx, offset); 1666*effe6ee7SSong Liu if (ret) 1667*effe6ee7SSong Liu return ret; 1668*effe6ee7SSong Liu } 1669*effe6ee7SSong Liu 1670*effe6ee7SSong Liu BUG_ON(offset < ctx->pool_offset || 1671*effe6ee7SSong Liu offset >= ctx->pool_offset + ctx->valid_pages * BLOCK_SECTORS); 1672*effe6ee7SSong Liu 1673*effe6ee7SSong Liu memcpy(page_address(page), 1674*effe6ee7SSong Liu page_address(ctx->ra_pool[(offset - ctx->pool_offset) >> 1675*effe6ee7SSong Liu BLOCK_SECTOR_SHIFT]), 1676*effe6ee7SSong Liu PAGE_SIZE); 1677*effe6ee7SSong Liu return 0; 1678*effe6ee7SSong Liu } 1679*effe6ee7SSong Liu 16809ed988f5SSong Liu static int r5l_recovery_read_meta_block(struct r5l_log *log, 1681355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 1682355810d1SShaohua Li { 1683355810d1SShaohua Li struct page *page = ctx->meta_page; 1684355810d1SShaohua Li struct r5l_meta_block *mb; 1685355810d1SShaohua Li u32 crc, stored_crc; 1686*effe6ee7SSong Liu int ret; 1687355810d1SShaohua Li 1688*effe6ee7SSong Liu ret = r5l_recovery_read_page(log, ctx, page, ctx->pos); 1689*effe6ee7SSong Liu if (ret != 0) 1690*effe6ee7SSong Liu return ret; 1691355810d1SShaohua Li 1692355810d1SShaohua Li mb = page_address(page); 1693355810d1SShaohua Li stored_crc = le32_to_cpu(mb->checksum); 1694355810d1SShaohua Li mb->checksum = 0; 1695355810d1SShaohua Li 1696355810d1SShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 1697355810d1SShaohua Li le64_to_cpu(mb->seq) != ctx->seq || 1698355810d1SShaohua Li mb->version != R5LOG_VERSION || 1699355810d1SShaohua Li le64_to_cpu(mb->position) != ctx->pos) 1700355810d1SShaohua Li return -EINVAL; 1701355810d1SShaohua Li 17025cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 1703355810d1SShaohua Li if (stored_crc != crc) 1704355810d1SShaohua Li return -EINVAL; 1705355810d1SShaohua Li 1706355810d1SShaohua Li if (le32_to_cpu(mb->meta_size) > PAGE_SIZE) 1707355810d1SShaohua Li return -EINVAL; 1708355810d1SShaohua Li 1709355810d1SShaohua Li ctx->meta_total_blocks = BLOCK_SECTORS; 1710355810d1SShaohua Li 1711355810d1SShaohua Li return 0; 1712355810d1SShaohua Li } 1713355810d1SShaohua Li 17149ed988f5SSong Liu static void 17159ed988f5SSong Liu r5l_recovery_create_empty_meta_block(struct r5l_log *log, 17169ed988f5SSong Liu struct page *page, 17179ed988f5SSong Liu sector_t pos, u64 seq) 1718355810d1SShaohua Li { 1719355810d1SShaohua Li struct r5l_meta_block *mb; 1720355810d1SShaohua Li 1721355810d1SShaohua Li mb = page_address(page); 17229ed988f5SSong Liu clear_page(mb); 1723355810d1SShaohua Li mb->magic = cpu_to_le32(R5LOG_MAGIC); 1724355810d1SShaohua Li mb->version = R5LOG_VERSION; 1725355810d1SShaohua Li mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); 1726355810d1SShaohua Li mb->seq = cpu_to_le64(seq); 1727355810d1SShaohua Li mb->position = cpu_to_le64(pos); 1728355810d1SShaohua Li } 1729355810d1SShaohua Li 1730355810d1SShaohua Li static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, 1731355810d1SShaohua Li u64 seq) 1732355810d1SShaohua Li { 1733355810d1SShaohua Li struct page *page; 1734355810d1SShaohua Li struct r5l_meta_block *mb; 1735355810d1SShaohua Li 17369ed988f5SSong Liu page = alloc_page(GFP_KERNEL); 1737355810d1SShaohua Li if (!page) 1738355810d1SShaohua Li return -ENOMEM; 17399ed988f5SSong Liu r5l_recovery_create_empty_meta_block(log, page, pos, seq); 1740355810d1SShaohua Li mb = page_address(page); 17415c88f403SSong Liu mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, 17425c88f403SSong Liu mb, PAGE_SIZE)); 1743796a5cf0SMike Christie if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, REQ_OP_WRITE, 174470fd7614SChristoph Hellwig REQ_FUA, false)) { 1745355810d1SShaohua Li __free_page(page); 1746355810d1SShaohua Li return -EIO; 1747355810d1SShaohua Li } 1748355810d1SShaohua Li __free_page(page); 1749355810d1SShaohua Li return 0; 1750355810d1SShaohua Li } 1751355810d1SShaohua Li 1752b4c625c6SSong Liu /* 1753b4c625c6SSong Liu * r5l_recovery_load_data and r5l_recovery_load_parity uses flag R5_Wantwrite 1754b4c625c6SSong Liu * to mark valid (potentially not flushed) data in the journal. 1755b4c625c6SSong Liu * 1756b4c625c6SSong Liu * We already verified checksum in r5l_recovery_verify_data_checksum_for_mb, 1757b4c625c6SSong Liu * so there should not be any mismatch here. 1758b4c625c6SSong Liu */ 1759b4c625c6SSong Liu static void r5l_recovery_load_data(struct r5l_log *log, 1760b4c625c6SSong Liu struct stripe_head *sh, 1761b4c625c6SSong Liu struct r5l_recovery_ctx *ctx, 1762b4c625c6SSong Liu struct r5l_payload_data_parity *payload, 1763b4c625c6SSong Liu sector_t log_offset) 1764f6bed0efSShaohua Li { 1765b4c625c6SSong Liu struct mddev *mddev = log->rdev->mddev; 1766b4c625c6SSong Liu struct r5conf *conf = mddev->private; 1767b4c625c6SSong Liu int dd_idx; 1768355810d1SShaohua Li 1769b4c625c6SSong Liu raid5_compute_sector(conf, 1770b4c625c6SSong Liu le64_to_cpu(payload->location), 0, 1771b4c625c6SSong Liu &dd_idx, sh); 1772*effe6ee7SSong Liu r5l_recovery_read_page(log, ctx, sh->dev[dd_idx].page, log_offset); 1773b4c625c6SSong Liu sh->dev[dd_idx].log_checksum = 1774b4c625c6SSong Liu le32_to_cpu(payload->checksum[0]); 1775b4c625c6SSong Liu ctx->meta_total_blocks += BLOCK_SECTORS; 1776b4c625c6SSong Liu 1777b4c625c6SSong Liu set_bit(R5_Wantwrite, &sh->dev[dd_idx].flags); 1778b4c625c6SSong Liu set_bit(STRIPE_R5C_CACHING, &sh->state); 1779b4c625c6SSong Liu } 1780b4c625c6SSong Liu 1781b4c625c6SSong Liu static void r5l_recovery_load_parity(struct r5l_log *log, 1782b4c625c6SSong Liu struct stripe_head *sh, 1783b4c625c6SSong Liu struct r5l_recovery_ctx *ctx, 1784b4c625c6SSong Liu struct r5l_payload_data_parity *payload, 1785b4c625c6SSong Liu sector_t log_offset) 1786b4c625c6SSong Liu { 1787b4c625c6SSong Liu struct mddev *mddev = log->rdev->mddev; 1788b4c625c6SSong Liu struct r5conf *conf = mddev->private; 1789b4c625c6SSong Liu 1790b4c625c6SSong Liu ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded; 1791*effe6ee7SSong Liu r5l_recovery_read_page(log, ctx, sh->dev[sh->pd_idx].page, log_offset); 1792b4c625c6SSong Liu sh->dev[sh->pd_idx].log_checksum = 1793b4c625c6SSong Liu le32_to_cpu(payload->checksum[0]); 1794b4c625c6SSong Liu set_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags); 1795b4c625c6SSong Liu 1796b4c625c6SSong Liu if (sh->qd_idx >= 0) { 1797*effe6ee7SSong Liu r5l_recovery_read_page( 1798*effe6ee7SSong Liu log, ctx, sh->dev[sh->qd_idx].page, 1799*effe6ee7SSong Liu r5l_ring_add(log, log_offset, BLOCK_SECTORS)); 1800b4c625c6SSong Liu sh->dev[sh->qd_idx].log_checksum = 1801b4c625c6SSong Liu le32_to_cpu(payload->checksum[1]); 1802b4c625c6SSong Liu set_bit(R5_Wantwrite, &sh->dev[sh->qd_idx].flags); 1803b4c625c6SSong Liu } 1804b4c625c6SSong Liu clear_bit(STRIPE_R5C_CACHING, &sh->state); 1805b4c625c6SSong Liu } 1806b4c625c6SSong Liu 1807b4c625c6SSong Liu static void r5l_recovery_reset_stripe(struct stripe_head *sh) 1808b4c625c6SSong Liu { 1809b4c625c6SSong Liu int i; 1810b4c625c6SSong Liu 1811b4c625c6SSong Liu sh->state = 0; 1812b4c625c6SSong Liu sh->log_start = MaxSector; 1813b4c625c6SSong Liu for (i = sh->disks; i--; ) 1814b4c625c6SSong Liu sh->dev[i].flags = 0; 1815b4c625c6SSong Liu } 1816b4c625c6SSong Liu 1817b4c625c6SSong Liu static void 1818b4c625c6SSong Liu r5l_recovery_replay_one_stripe(struct r5conf *conf, 1819b4c625c6SSong Liu struct stripe_head *sh, 1820b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 1821b4c625c6SSong Liu { 1822b4c625c6SSong Liu struct md_rdev *rdev, *rrdev; 1823b4c625c6SSong Liu int disk_index; 1824b4c625c6SSong Liu int data_count = 0; 1825b4c625c6SSong Liu 1826b4c625c6SSong Liu for (disk_index = 0; disk_index < sh->disks; disk_index++) { 1827b4c625c6SSong Liu if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) 1828b4c625c6SSong Liu continue; 1829b4c625c6SSong Liu if (disk_index == sh->qd_idx || disk_index == sh->pd_idx) 1830b4c625c6SSong Liu continue; 1831b4c625c6SSong Liu data_count++; 1832b4c625c6SSong Liu } 1833b4c625c6SSong Liu 1834b4c625c6SSong Liu /* 1835b4c625c6SSong Liu * stripes that only have parity must have been flushed 1836b4c625c6SSong Liu * before the crash that we are now recovering from, so 1837b4c625c6SSong Liu * there is nothing more to recovery. 1838b4c625c6SSong Liu */ 1839b4c625c6SSong Liu if (data_count == 0) 1840b4c625c6SSong Liu goto out; 1841b4c625c6SSong Liu 1842b4c625c6SSong Liu for (disk_index = 0; disk_index < sh->disks; disk_index++) { 1843b4c625c6SSong Liu if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) 1844b4c625c6SSong Liu continue; 1845b4c625c6SSong Liu 1846b4c625c6SSong Liu /* in case device is broken */ 1847b4c625c6SSong Liu rcu_read_lock(); 1848b4c625c6SSong Liu rdev = rcu_dereference(conf->disks[disk_index].rdev); 1849b4c625c6SSong Liu if (rdev) { 1850b4c625c6SSong Liu atomic_inc(&rdev->nr_pending); 1851b4c625c6SSong Liu rcu_read_unlock(); 1852b4c625c6SSong Liu sync_page_io(rdev, sh->sector, PAGE_SIZE, 1853b4c625c6SSong Liu sh->dev[disk_index].page, REQ_OP_WRITE, 0, 1854b4c625c6SSong Liu false); 1855b4c625c6SSong Liu rdev_dec_pending(rdev, rdev->mddev); 1856b4c625c6SSong Liu rcu_read_lock(); 1857b4c625c6SSong Liu } 1858b4c625c6SSong Liu rrdev = rcu_dereference(conf->disks[disk_index].replacement); 1859b4c625c6SSong Liu if (rrdev) { 1860b4c625c6SSong Liu atomic_inc(&rrdev->nr_pending); 1861b4c625c6SSong Liu rcu_read_unlock(); 1862b4c625c6SSong Liu sync_page_io(rrdev, sh->sector, PAGE_SIZE, 1863b4c625c6SSong Liu sh->dev[disk_index].page, REQ_OP_WRITE, 0, 1864b4c625c6SSong Liu false); 1865b4c625c6SSong Liu rdev_dec_pending(rrdev, rrdev->mddev); 1866b4c625c6SSong Liu rcu_read_lock(); 1867b4c625c6SSong Liu } 1868b4c625c6SSong Liu rcu_read_unlock(); 1869b4c625c6SSong Liu } 1870b4c625c6SSong Liu ctx->data_parity_stripes++; 1871b4c625c6SSong Liu out: 1872b4c625c6SSong Liu r5l_recovery_reset_stripe(sh); 1873b4c625c6SSong Liu } 1874b4c625c6SSong Liu 1875b4c625c6SSong Liu static struct stripe_head * 1876b4c625c6SSong Liu r5c_recovery_alloc_stripe(struct r5conf *conf, 18773c66abbaSSong Liu sector_t stripe_sect) 1878b4c625c6SSong Liu { 1879b4c625c6SSong Liu struct stripe_head *sh; 1880b4c625c6SSong Liu 1881b4c625c6SSong Liu sh = raid5_get_active_stripe(conf, stripe_sect, 0, 1, 0); 1882b4c625c6SSong Liu if (!sh) 1883b4c625c6SSong Liu return NULL; /* no more stripe available */ 1884b4c625c6SSong Liu 1885b4c625c6SSong Liu r5l_recovery_reset_stripe(sh); 1886b4c625c6SSong Liu 1887b4c625c6SSong Liu return sh; 1888b4c625c6SSong Liu } 1889b4c625c6SSong Liu 1890b4c625c6SSong Liu static struct stripe_head * 1891b4c625c6SSong Liu r5c_recovery_lookup_stripe(struct list_head *list, sector_t sect) 1892b4c625c6SSong Liu { 1893b4c625c6SSong Liu struct stripe_head *sh; 1894b4c625c6SSong Liu 1895b4c625c6SSong Liu list_for_each_entry(sh, list, lru) 1896b4c625c6SSong Liu if (sh->sector == sect) 1897b4c625c6SSong Liu return sh; 1898b4c625c6SSong Liu return NULL; 1899b4c625c6SSong Liu } 1900b4c625c6SSong Liu 1901b4c625c6SSong Liu static void 1902b4c625c6SSong Liu r5c_recovery_drop_stripes(struct list_head *cached_stripe_list, 1903b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 1904b4c625c6SSong Liu { 1905b4c625c6SSong Liu struct stripe_head *sh, *next; 1906b4c625c6SSong Liu 1907b4c625c6SSong Liu list_for_each_entry_safe(sh, next, cached_stripe_list, lru) { 1908b4c625c6SSong Liu r5l_recovery_reset_stripe(sh); 1909b4c625c6SSong Liu list_del_init(&sh->lru); 1910b4c625c6SSong Liu raid5_release_stripe(sh); 1911b4c625c6SSong Liu } 1912b4c625c6SSong Liu } 1913b4c625c6SSong Liu 1914b4c625c6SSong Liu static void 1915b4c625c6SSong Liu r5c_recovery_replay_stripes(struct list_head *cached_stripe_list, 1916b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 1917b4c625c6SSong Liu { 1918b4c625c6SSong Liu struct stripe_head *sh, *next; 1919b4c625c6SSong Liu 1920b4c625c6SSong Liu list_for_each_entry_safe(sh, next, cached_stripe_list, lru) 1921b4c625c6SSong Liu if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { 1922b4c625c6SSong Liu r5l_recovery_replay_one_stripe(sh->raid_conf, sh, ctx); 1923b4c625c6SSong Liu list_del_init(&sh->lru); 1924b4c625c6SSong Liu raid5_release_stripe(sh); 1925b4c625c6SSong Liu } 1926b4c625c6SSong Liu } 1927b4c625c6SSong Liu 1928b4c625c6SSong Liu /* if matches return 0; otherwise return -EINVAL */ 1929b4c625c6SSong Liu static int 1930*effe6ee7SSong Liu r5l_recovery_verify_data_checksum(struct r5l_log *log, 1931*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx, 1932*effe6ee7SSong Liu struct page *page, 1933b4c625c6SSong Liu sector_t log_offset, __le32 log_checksum) 1934b4c625c6SSong Liu { 1935b4c625c6SSong Liu void *addr; 1936b4c625c6SSong Liu u32 checksum; 1937b4c625c6SSong Liu 1938*effe6ee7SSong Liu r5l_recovery_read_page(log, ctx, page, log_offset); 1939b4c625c6SSong Liu addr = kmap_atomic(page); 1940b4c625c6SSong Liu checksum = crc32c_le(log->uuid_checksum, addr, PAGE_SIZE); 1941b4c625c6SSong Liu kunmap_atomic(addr); 1942b4c625c6SSong Liu return (le32_to_cpu(log_checksum) == checksum) ? 0 : -EINVAL; 1943b4c625c6SSong Liu } 1944b4c625c6SSong Liu 1945b4c625c6SSong Liu /* 1946b4c625c6SSong Liu * before loading data to stripe cache, we need verify checksum for all data, 1947b4c625c6SSong Liu * if there is mismatch for any data page, we drop all data in the mata block 1948b4c625c6SSong Liu */ 1949b4c625c6SSong Liu static int 1950b4c625c6SSong Liu r5l_recovery_verify_data_checksum_for_mb(struct r5l_log *log, 1951b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 1952b4c625c6SSong Liu { 1953b4c625c6SSong Liu struct mddev *mddev = log->rdev->mddev; 1954b4c625c6SSong Liu struct r5conf *conf = mddev->private; 1955b4c625c6SSong Liu struct r5l_meta_block *mb = page_address(ctx->meta_page); 1956b4c625c6SSong Liu sector_t mb_offset = sizeof(struct r5l_meta_block); 1957b4c625c6SSong Liu sector_t log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 1958b4c625c6SSong Liu struct page *page; 1959b4c625c6SSong Liu struct r5l_payload_data_parity *payload; 1960b4c625c6SSong Liu 1961b4c625c6SSong Liu page = alloc_page(GFP_KERNEL); 1962b4c625c6SSong Liu if (!page) 1963355810d1SShaohua Li return -ENOMEM; 1964355810d1SShaohua Li 1965b4c625c6SSong Liu while (mb_offset < le32_to_cpu(mb->meta_size)) { 1966b4c625c6SSong Liu payload = (void *)mb + mb_offset; 1967b4c625c6SSong Liu 1968b4c625c6SSong Liu if (payload->header.type == R5LOG_PAYLOAD_DATA) { 1969b4c625c6SSong Liu if (r5l_recovery_verify_data_checksum( 1970*effe6ee7SSong Liu log, ctx, page, log_offset, 1971b4c625c6SSong Liu payload->checksum[0]) < 0) 1972b4c625c6SSong Liu goto mismatch; 1973b4c625c6SSong Liu } else if (payload->header.type == R5LOG_PAYLOAD_PARITY) { 1974b4c625c6SSong Liu if (r5l_recovery_verify_data_checksum( 1975*effe6ee7SSong Liu log, ctx, page, log_offset, 1976b4c625c6SSong Liu payload->checksum[0]) < 0) 1977b4c625c6SSong Liu goto mismatch; 1978b4c625c6SSong Liu if (conf->max_degraded == 2 && /* q for RAID 6 */ 1979b4c625c6SSong Liu r5l_recovery_verify_data_checksum( 1980*effe6ee7SSong Liu log, ctx, page, 1981b4c625c6SSong Liu r5l_ring_add(log, log_offset, 1982b4c625c6SSong Liu BLOCK_SECTORS), 1983b4c625c6SSong Liu payload->checksum[1]) < 0) 1984b4c625c6SSong Liu goto mismatch; 1985b4c625c6SSong Liu } else /* not R5LOG_PAYLOAD_DATA or R5LOG_PAYLOAD_PARITY */ 1986b4c625c6SSong Liu goto mismatch; 1987b4c625c6SSong Liu 1988b4c625c6SSong Liu log_offset = r5l_ring_add(log, log_offset, 1989b4c625c6SSong Liu le32_to_cpu(payload->size)); 1990b4c625c6SSong Liu 1991b4c625c6SSong Liu mb_offset += sizeof(struct r5l_payload_data_parity) + 1992b4c625c6SSong Liu sizeof(__le32) * 1993b4c625c6SSong Liu (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); 1994b4c625c6SSong Liu } 1995b4c625c6SSong Liu 1996b4c625c6SSong Liu put_page(page); 1997b4c625c6SSong Liu return 0; 1998b4c625c6SSong Liu 1999b4c625c6SSong Liu mismatch: 2000b4c625c6SSong Liu put_page(page); 2001b4c625c6SSong Liu return -EINVAL; 2002b4c625c6SSong Liu } 2003b4c625c6SSong Liu 2004b4c625c6SSong Liu /* 2005b4c625c6SSong Liu * Analyze all data/parity pages in one meta block 2006b4c625c6SSong Liu * Returns: 2007b4c625c6SSong Liu * 0 for success 2008b4c625c6SSong Liu * -EINVAL for unknown playload type 2009b4c625c6SSong Liu * -EAGAIN for checksum mismatch of data page 2010b4c625c6SSong Liu * -ENOMEM for run out of memory (alloc_page failed or run out of stripes) 2011b4c625c6SSong Liu */ 2012b4c625c6SSong Liu static int 2013b4c625c6SSong Liu r5c_recovery_analyze_meta_block(struct r5l_log *log, 2014b4c625c6SSong Liu struct r5l_recovery_ctx *ctx, 2015b4c625c6SSong Liu struct list_head *cached_stripe_list) 2016b4c625c6SSong Liu { 2017b4c625c6SSong Liu struct mddev *mddev = log->rdev->mddev; 2018b4c625c6SSong Liu struct r5conf *conf = mddev->private; 2019b4c625c6SSong Liu struct r5l_meta_block *mb; 2020b4c625c6SSong Liu struct r5l_payload_data_parity *payload; 2021b4c625c6SSong Liu int mb_offset; 2022b4c625c6SSong Liu sector_t log_offset; 2023b4c625c6SSong Liu sector_t stripe_sect; 2024b4c625c6SSong Liu struct stripe_head *sh; 2025b4c625c6SSong Liu int ret; 2026b4c625c6SSong Liu 2027b4c625c6SSong Liu /* 2028b4c625c6SSong Liu * for mismatch in data blocks, we will drop all data in this mb, but 2029b4c625c6SSong Liu * we will still read next mb for other data with FLUSH flag, as 2030b4c625c6SSong Liu * io_unit could finish out of order. 2031b4c625c6SSong Liu */ 2032b4c625c6SSong Liu ret = r5l_recovery_verify_data_checksum_for_mb(log, ctx); 2033b4c625c6SSong Liu if (ret == -EINVAL) 2034b4c625c6SSong Liu return -EAGAIN; 2035b4c625c6SSong Liu else if (ret) 2036b4c625c6SSong Liu return ret; /* -ENOMEM duo to alloc_page() failed */ 2037b4c625c6SSong Liu 2038b4c625c6SSong Liu mb = page_address(ctx->meta_page); 2039b4c625c6SSong Liu mb_offset = sizeof(struct r5l_meta_block); 2040b4c625c6SSong Liu log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 2041b4c625c6SSong Liu 2042b4c625c6SSong Liu while (mb_offset < le32_to_cpu(mb->meta_size)) { 2043b4c625c6SSong Liu int dd; 2044b4c625c6SSong Liu 2045b4c625c6SSong Liu payload = (void *)mb + mb_offset; 2046b4c625c6SSong Liu stripe_sect = (payload->header.type == R5LOG_PAYLOAD_DATA) ? 2047b4c625c6SSong Liu raid5_compute_sector( 2048b4c625c6SSong Liu conf, le64_to_cpu(payload->location), 0, &dd, 2049b4c625c6SSong Liu NULL) 2050b4c625c6SSong Liu : le64_to_cpu(payload->location); 2051b4c625c6SSong Liu 2052b4c625c6SSong Liu sh = r5c_recovery_lookup_stripe(cached_stripe_list, 2053b4c625c6SSong Liu stripe_sect); 2054b4c625c6SSong Liu 2055b4c625c6SSong Liu if (!sh) { 20563c66abbaSSong Liu sh = r5c_recovery_alloc_stripe(conf, stripe_sect); 2057b4c625c6SSong Liu /* 2058b4c625c6SSong Liu * cannot get stripe from raid5_get_active_stripe 2059b4c625c6SSong Liu * try replay some stripes 2060b4c625c6SSong Liu */ 2061b4c625c6SSong Liu if (!sh) { 2062b4c625c6SSong Liu r5c_recovery_replay_stripes( 2063b4c625c6SSong Liu cached_stripe_list, ctx); 2064b4c625c6SSong Liu sh = r5c_recovery_alloc_stripe( 20653c66abbaSSong Liu conf, stripe_sect); 2066b4c625c6SSong Liu } 2067b4c625c6SSong Liu if (!sh) { 2068b4c625c6SSong Liu pr_debug("md/raid:%s: Increasing stripe cache size to %d to recovery data on journal.\n", 2069b4c625c6SSong Liu mdname(mddev), 2070b4c625c6SSong Liu conf->min_nr_stripes * 2); 2071b4c625c6SSong Liu raid5_set_cache_size(mddev, 2072b4c625c6SSong Liu conf->min_nr_stripes * 2); 20733c66abbaSSong Liu sh = r5c_recovery_alloc_stripe(conf, 20743c66abbaSSong Liu stripe_sect); 2075b4c625c6SSong Liu } 2076b4c625c6SSong Liu if (!sh) { 2077b4c625c6SSong Liu pr_err("md/raid:%s: Cannot get enough stripes due to memory pressure. Recovery failed.\n", 2078b4c625c6SSong Liu mdname(mddev)); 2079b4c625c6SSong Liu return -ENOMEM; 2080b4c625c6SSong Liu } 2081b4c625c6SSong Liu list_add_tail(&sh->lru, cached_stripe_list); 2082b4c625c6SSong Liu } 2083b4c625c6SSong Liu 2084b4c625c6SSong Liu if (payload->header.type == R5LOG_PAYLOAD_DATA) { 2085f7b7bee7SZhengyuan Liu if (!test_bit(STRIPE_R5C_CACHING, &sh->state) && 2086f7b7bee7SZhengyuan Liu test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags)) { 2087b4c625c6SSong Liu r5l_recovery_replay_one_stripe(conf, sh, ctx); 2088b4c625c6SSong Liu list_move_tail(&sh->lru, cached_stripe_list); 2089b4c625c6SSong Liu } 2090b4c625c6SSong Liu r5l_recovery_load_data(log, sh, ctx, payload, 2091b4c625c6SSong Liu log_offset); 2092b4c625c6SSong Liu } else if (payload->header.type == R5LOG_PAYLOAD_PARITY) 2093b4c625c6SSong Liu r5l_recovery_load_parity(log, sh, ctx, payload, 2094b4c625c6SSong Liu log_offset); 2095b4c625c6SSong Liu else 2096b4c625c6SSong Liu return -EINVAL; 2097b4c625c6SSong Liu 2098b4c625c6SSong Liu log_offset = r5l_ring_add(log, log_offset, 2099b4c625c6SSong Liu le32_to_cpu(payload->size)); 2100b4c625c6SSong Liu 2101b4c625c6SSong Liu mb_offset += sizeof(struct r5l_payload_data_parity) + 2102b4c625c6SSong Liu sizeof(__le32) * 2103b4c625c6SSong Liu (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); 2104b4c625c6SSong Liu } 2105b4c625c6SSong Liu 2106b4c625c6SSong Liu return 0; 2107b4c625c6SSong Liu } 2108b4c625c6SSong Liu 2109b4c625c6SSong Liu /* 2110b4c625c6SSong Liu * Load the stripe into cache. The stripe will be written out later by 2111b4c625c6SSong Liu * the stripe cache state machine. 2112b4c625c6SSong Liu */ 2113b4c625c6SSong Liu static void r5c_recovery_load_one_stripe(struct r5l_log *log, 2114b4c625c6SSong Liu struct stripe_head *sh) 2115b4c625c6SSong Liu { 2116b4c625c6SSong Liu struct r5dev *dev; 2117b4c625c6SSong Liu int i; 2118b4c625c6SSong Liu 2119b4c625c6SSong Liu for (i = sh->disks; i--; ) { 2120b4c625c6SSong Liu dev = sh->dev + i; 2121b4c625c6SSong Liu if (test_and_clear_bit(R5_Wantwrite, &dev->flags)) { 2122b4c625c6SSong Liu set_bit(R5_InJournal, &dev->flags); 2123b4c625c6SSong Liu set_bit(R5_UPTODATE, &dev->flags); 2124b4c625c6SSong Liu } 2125b4c625c6SSong Liu } 2126b4c625c6SSong Liu } 2127b4c625c6SSong Liu 2128b4c625c6SSong Liu /* 2129b4c625c6SSong Liu * Scan through the log for all to-be-flushed data 2130b4c625c6SSong Liu * 2131b4c625c6SSong Liu * For stripes with data and parity, namely Data-Parity stripe 2132b4c625c6SSong Liu * (STRIPE_R5C_CACHING == 0), we simply replay all the writes. 2133b4c625c6SSong Liu * 2134b4c625c6SSong Liu * For stripes with only data, namely Data-Only stripe 2135b4c625c6SSong Liu * (STRIPE_R5C_CACHING == 1), we load them to stripe cache state machine. 2136b4c625c6SSong Liu * 2137b4c625c6SSong Liu * For a stripe, if we see data after parity, we should discard all previous 2138b4c625c6SSong Liu * data and parity for this stripe, as these data are already flushed to 2139b4c625c6SSong Liu * the array. 2140b4c625c6SSong Liu * 2141b4c625c6SSong Liu * At the end of the scan, we return the new journal_tail, which points to 2142b4c625c6SSong Liu * first data-only stripe on the journal device, or next invalid meta block. 2143b4c625c6SSong Liu */ 2144b4c625c6SSong Liu static int r5c_recovery_flush_log(struct r5l_log *log, 2145b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 2146b4c625c6SSong Liu { 2147bc8f167fSJackieLiu struct stripe_head *sh; 2148b4c625c6SSong Liu int ret = 0; 2149b4c625c6SSong Liu 2150b4c625c6SSong Liu /* scan through the log */ 2151b4c625c6SSong Liu while (1) { 2152b4c625c6SSong Liu if (r5l_recovery_read_meta_block(log, ctx)) 2153b4c625c6SSong Liu break; 2154b4c625c6SSong Liu 2155b4c625c6SSong Liu ret = r5c_recovery_analyze_meta_block(log, ctx, 2156b4c625c6SSong Liu &ctx->cached_list); 2157b4c625c6SSong Liu /* 2158b4c625c6SSong Liu * -EAGAIN means mismatch in data block, in this case, we still 2159b4c625c6SSong Liu * try scan the next metablock 2160b4c625c6SSong Liu */ 2161b4c625c6SSong Liu if (ret && ret != -EAGAIN) 2162b4c625c6SSong Liu break; /* ret == -EINVAL or -ENOMEM */ 2163b4c625c6SSong Liu ctx->seq++; 2164b4c625c6SSong Liu ctx->pos = r5l_ring_add(log, ctx->pos, ctx->meta_total_blocks); 2165b4c625c6SSong Liu } 2166b4c625c6SSong Liu 2167b4c625c6SSong Liu if (ret == -ENOMEM) { 2168b4c625c6SSong Liu r5c_recovery_drop_stripes(&ctx->cached_list, ctx); 2169b4c625c6SSong Liu return ret; 2170b4c625c6SSong Liu } 2171b4c625c6SSong Liu 2172b4c625c6SSong Liu /* replay data-parity stripes */ 2173b4c625c6SSong Liu r5c_recovery_replay_stripes(&ctx->cached_list, ctx); 2174b4c625c6SSong Liu 2175b4c625c6SSong Liu /* load data-only stripes to stripe cache */ 2176bc8f167fSJackieLiu list_for_each_entry(sh, &ctx->cached_list, lru) { 2177b4c625c6SSong Liu WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); 2178b4c625c6SSong Liu r5c_recovery_load_one_stripe(log, sh); 2179b4c625c6SSong Liu ctx->data_only_stripes++; 2180b4c625c6SSong Liu } 2181b4c625c6SSong Liu 2182b4c625c6SSong Liu return 0; 2183b4c625c6SSong Liu } 2184355810d1SShaohua Li 2185355810d1SShaohua Li /* 2186355810d1SShaohua Li * we did a recovery. Now ctx.pos points to an invalid meta block. New 2187355810d1SShaohua Li * log will start here. but we can't let superblock point to last valid 2188355810d1SShaohua Li * meta block. The log might looks like: 2189355810d1SShaohua Li * | meta 1| meta 2| meta 3| 2190355810d1SShaohua Li * meta 1 is valid, meta 2 is invalid. meta 3 could be valid. If 2191355810d1SShaohua Li * superblock points to meta 1, we write a new valid meta 2n. if crash 2192355810d1SShaohua Li * happens again, new recovery will start from meta 1. Since meta 2n is 2193355810d1SShaohua Li * valid now, recovery will think meta 3 is valid, which is wrong. 2194355810d1SShaohua Li * The solution is we create a new meta in meta2 with its seq == meta 21953c6edc66SSong Liu * 1's seq + 10000 and let superblock points to meta2. The same recovery 21963c6edc66SSong Liu * will not think meta 3 is a valid meta, because its seq doesn't match 2197355810d1SShaohua Li */ 2198355810d1SShaohua Li 2199b4c625c6SSong Liu /* 2200b4c625c6SSong Liu * Before recovery, the log looks like the following 2201b4c625c6SSong Liu * 2202b4c625c6SSong Liu * --------------------------------------------- 2203b4c625c6SSong Liu * | valid log | invalid log | 2204b4c625c6SSong Liu * --------------------------------------------- 2205b4c625c6SSong Liu * ^ 2206b4c625c6SSong Liu * |- log->last_checkpoint 2207b4c625c6SSong Liu * |- log->last_cp_seq 2208b4c625c6SSong Liu * 2209b4c625c6SSong Liu * Now we scan through the log until we see invalid entry 2210b4c625c6SSong Liu * 2211b4c625c6SSong Liu * --------------------------------------------- 2212b4c625c6SSong Liu * | valid log | invalid log | 2213b4c625c6SSong Liu * --------------------------------------------- 2214b4c625c6SSong Liu * ^ ^ 2215b4c625c6SSong Liu * |- log->last_checkpoint |- ctx->pos 2216b4c625c6SSong Liu * |- log->last_cp_seq |- ctx->seq 2217b4c625c6SSong Liu * 2218b4c625c6SSong Liu * From this point, we need to increase seq number by 10 to avoid 2219b4c625c6SSong Liu * confusing next recovery. 2220b4c625c6SSong Liu * 2221b4c625c6SSong Liu * --------------------------------------------- 2222b4c625c6SSong Liu * | valid log | invalid log | 2223b4c625c6SSong Liu * --------------------------------------------- 2224b4c625c6SSong Liu * ^ ^ 2225b4c625c6SSong Liu * |- log->last_checkpoint |- ctx->pos+1 22263c6edc66SSong Liu * |- log->last_cp_seq |- ctx->seq+10001 2227b4c625c6SSong Liu * 2228b4c625c6SSong Liu * However, it is not safe to start the state machine yet, because data only 2229b4c625c6SSong Liu * parities are not yet secured in RAID. To save these data only parities, we 2230b4c625c6SSong Liu * rewrite them from seq+11. 2231b4c625c6SSong Liu * 2232b4c625c6SSong Liu * ----------------------------------------------------------------- 2233b4c625c6SSong Liu * | valid log | data only stripes | invalid log | 2234b4c625c6SSong Liu * ----------------------------------------------------------------- 2235b4c625c6SSong Liu * ^ ^ 2236b4c625c6SSong Liu * |- log->last_checkpoint |- ctx->pos+n 22373c6edc66SSong Liu * |- log->last_cp_seq |- ctx->seq+10000+n 2238b4c625c6SSong Liu * 2239b4c625c6SSong Liu * If failure happens again during this process, the recovery can safe start 2240b4c625c6SSong Liu * again from log->last_checkpoint. 2241b4c625c6SSong Liu * 2242b4c625c6SSong Liu * Once data only stripes are rewritten to journal, we move log_tail 2243b4c625c6SSong Liu * 2244b4c625c6SSong Liu * ----------------------------------------------------------------- 2245b4c625c6SSong Liu * | old log | data only stripes | invalid log | 2246b4c625c6SSong Liu * ----------------------------------------------------------------- 2247b4c625c6SSong Liu * ^ ^ 2248b4c625c6SSong Liu * |- log->last_checkpoint |- ctx->pos+n 22493c6edc66SSong Liu * |- log->last_cp_seq |- ctx->seq+10000+n 2250b4c625c6SSong Liu * 2251b4c625c6SSong Liu * Then we can safely start the state machine. If failure happens from this 2252b4c625c6SSong Liu * point on, the recovery will start from new log->last_checkpoint. 2253b4c625c6SSong Liu */ 2254b4c625c6SSong Liu static int 2255b4c625c6SSong Liu r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log, 2256b4c625c6SSong Liu struct r5l_recovery_ctx *ctx) 2257b4c625c6SSong Liu { 2258a85dd7b8SSong Liu struct stripe_head *sh; 2259b4c625c6SSong Liu struct mddev *mddev = log->rdev->mddev; 2260b4c625c6SSong Liu struct page *page; 22613c66abbaSSong Liu sector_t next_checkpoint = MaxSector; 2262b4c625c6SSong Liu 2263b4c625c6SSong Liu page = alloc_page(GFP_KERNEL); 2264b4c625c6SSong Liu if (!page) { 2265b4c625c6SSong Liu pr_err("md/raid:%s: cannot allocate memory to rewrite data only stripes\n", 2266b4c625c6SSong Liu mdname(mddev)); 2267b4c625c6SSong Liu return -ENOMEM; 2268b4c625c6SSong Liu } 2269b4c625c6SSong Liu 22703c66abbaSSong Liu WARN_ON(list_empty(&ctx->cached_list)); 22713c66abbaSSong Liu 2272a85dd7b8SSong Liu list_for_each_entry(sh, &ctx->cached_list, lru) { 2273b4c625c6SSong Liu struct r5l_meta_block *mb; 2274b4c625c6SSong Liu int i; 2275b4c625c6SSong Liu int offset; 2276b4c625c6SSong Liu sector_t write_pos; 2277b4c625c6SSong Liu 2278b4c625c6SSong Liu WARN_ON(!test_bit(STRIPE_R5C_CACHING, &sh->state)); 2279b4c625c6SSong Liu r5l_recovery_create_empty_meta_block(log, page, 2280b4c625c6SSong Liu ctx->pos, ctx->seq); 2281b4c625c6SSong Liu mb = page_address(page); 2282b4c625c6SSong Liu offset = le32_to_cpu(mb->meta_size); 2283fc833c2aSJackieLiu write_pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 2284b4c625c6SSong Liu 2285b4c625c6SSong Liu for (i = sh->disks; i--; ) { 2286b4c625c6SSong Liu struct r5dev *dev = &sh->dev[i]; 2287b4c625c6SSong Liu struct r5l_payload_data_parity *payload; 2288b4c625c6SSong Liu void *addr; 2289b4c625c6SSong Liu 2290b4c625c6SSong Liu if (test_bit(R5_InJournal, &dev->flags)) { 2291b4c625c6SSong Liu payload = (void *)mb + offset; 2292b4c625c6SSong Liu payload->header.type = cpu_to_le16( 2293b4c625c6SSong Liu R5LOG_PAYLOAD_DATA); 2294b4c625c6SSong Liu payload->size = BLOCK_SECTORS; 2295b4c625c6SSong Liu payload->location = cpu_to_le64( 2296b4c625c6SSong Liu raid5_compute_blocknr(sh, i, 0)); 2297b4c625c6SSong Liu addr = kmap_atomic(dev->page); 2298b4c625c6SSong Liu payload->checksum[0] = cpu_to_le32( 2299b4c625c6SSong Liu crc32c_le(log->uuid_checksum, addr, 2300b4c625c6SSong Liu PAGE_SIZE)); 2301b4c625c6SSong Liu kunmap_atomic(addr); 2302b4c625c6SSong Liu sync_page_io(log->rdev, write_pos, PAGE_SIZE, 2303b4c625c6SSong Liu dev->page, REQ_OP_WRITE, 0, false); 2304b4c625c6SSong Liu write_pos = r5l_ring_add(log, write_pos, 2305b4c625c6SSong Liu BLOCK_SECTORS); 2306b4c625c6SSong Liu offset += sizeof(__le32) + 2307b4c625c6SSong Liu sizeof(struct r5l_payload_data_parity); 2308b4c625c6SSong Liu 2309b4c625c6SSong Liu } 2310b4c625c6SSong Liu } 2311b4c625c6SSong Liu mb->meta_size = cpu_to_le32(offset); 23125c88f403SSong Liu mb->checksum = cpu_to_le32(crc32c_le(log->uuid_checksum, 23135c88f403SSong Liu mb, PAGE_SIZE)); 2314b4c625c6SSong Liu sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, 231520737738SShaohua Li REQ_OP_WRITE, REQ_FUA, false); 2316b4c625c6SSong Liu sh->log_start = ctx->pos; 23173c66abbaSSong Liu list_add_tail(&sh->r5c, &log->stripe_in_journal_list); 23183c66abbaSSong Liu atomic_inc(&log->stripe_in_journal_count); 2319b4c625c6SSong Liu ctx->pos = write_pos; 2320b4c625c6SSong Liu ctx->seq += 1; 23213c66abbaSSong Liu next_checkpoint = sh->log_start; 2322b4c625c6SSong Liu } 23233c66abbaSSong Liu log->next_checkpoint = next_checkpoint; 2324b4c625c6SSong Liu __free_page(page); 2325b4c625c6SSong Liu return 0; 2326b4c625c6SSong Liu } 2327b4c625c6SSong Liu 2328a85dd7b8SSong Liu static void r5c_recovery_flush_data_only_stripes(struct r5l_log *log, 2329a85dd7b8SSong Liu struct r5l_recovery_ctx *ctx) 2330a85dd7b8SSong Liu { 2331a85dd7b8SSong Liu struct mddev *mddev = log->rdev->mddev; 2332a85dd7b8SSong Liu struct r5conf *conf = mddev->private; 2333a85dd7b8SSong Liu struct stripe_head *sh, *next; 2334a85dd7b8SSong Liu 2335a85dd7b8SSong Liu if (ctx->data_only_stripes == 0) 2336a85dd7b8SSong Liu return; 2337a85dd7b8SSong Liu 2338a85dd7b8SSong Liu log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_BACK; 2339a85dd7b8SSong Liu 2340a85dd7b8SSong Liu list_for_each_entry_safe(sh, next, &ctx->cached_list, lru) { 2341a85dd7b8SSong Liu r5c_make_stripe_write_out(sh); 2342a85dd7b8SSong Liu set_bit(STRIPE_HANDLE, &sh->state); 2343a85dd7b8SSong Liu list_del_init(&sh->lru); 2344a85dd7b8SSong Liu raid5_release_stripe(sh); 2345a85dd7b8SSong Liu } 2346a85dd7b8SSong Liu 2347a85dd7b8SSong Liu md_wakeup_thread(conf->mddev->thread); 2348a85dd7b8SSong Liu /* reuse conf->wait_for_quiescent in recovery */ 2349a85dd7b8SSong Liu wait_event(conf->wait_for_quiescent, 2350a85dd7b8SSong Liu atomic_read(&conf->active_stripes) == 0); 2351a85dd7b8SSong Liu 2352a85dd7b8SSong Liu log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; 2353a85dd7b8SSong Liu } 2354a85dd7b8SSong Liu 2355f6bed0efSShaohua Li static int r5l_recovery_log(struct r5l_log *log) 2356f6bed0efSShaohua Li { 23575aabf7c4SSong Liu struct mddev *mddev = log->rdev->mddev; 2358*effe6ee7SSong Liu struct r5l_recovery_ctx *ctx; 23595aabf7c4SSong Liu int ret; 236043b96748SJackieLiu sector_t pos; 2361355810d1SShaohua Li 2362*effe6ee7SSong Liu ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 2363*effe6ee7SSong Liu if (!ctx) 2364355810d1SShaohua Li return -ENOMEM; 2365355810d1SShaohua Li 2366*effe6ee7SSong Liu ctx->pos = log->last_checkpoint; 2367*effe6ee7SSong Liu ctx->seq = log->last_cp_seq; 2368*effe6ee7SSong Liu INIT_LIST_HEAD(&ctx->cached_list); 2369*effe6ee7SSong Liu ctx->meta_page = alloc_page(GFP_KERNEL); 2370*effe6ee7SSong Liu 2371*effe6ee7SSong Liu if (!ctx->meta_page) { 2372*effe6ee7SSong Liu ret = -ENOMEM; 2373*effe6ee7SSong Liu goto meta_page; 2374*effe6ee7SSong Liu } 2375*effe6ee7SSong Liu 2376*effe6ee7SSong Liu if (r5l_recovery_allocate_ra_pool(log, ctx) != 0) { 2377*effe6ee7SSong Liu ret = -ENOMEM; 2378*effe6ee7SSong Liu goto ra_pool; 2379*effe6ee7SSong Liu } 2380*effe6ee7SSong Liu 2381*effe6ee7SSong Liu ret = r5c_recovery_flush_log(log, ctx); 2382355810d1SShaohua Li 2383355810d1SShaohua Li if (ret) 2384*effe6ee7SSong Liu goto error; 23855aabf7c4SSong Liu 2386*effe6ee7SSong Liu pos = ctx->pos; 2387*effe6ee7SSong Liu ctx->seq += 10000; 238843b96748SJackieLiu 2389*effe6ee7SSong Liu if ((ctx->data_only_stripes == 0) && (ctx->data_parity_stripes == 0)) 23905aabf7c4SSong Liu pr_debug("md/raid:%s: starting from clean shutdown\n", 23915aabf7c4SSong Liu mdname(mddev)); 2392a85dd7b8SSong Liu else 239399f17890SColin Ian King pr_debug("md/raid:%s: recovering %d data-only stripes and %d data-parity stripes\n", 2394*effe6ee7SSong Liu mdname(mddev), ctx->data_only_stripes, 2395*effe6ee7SSong Liu ctx->data_parity_stripes); 23965aabf7c4SSong Liu 2397*effe6ee7SSong Liu if (ctx->data_only_stripes == 0) { 2398*effe6ee7SSong Liu log->next_checkpoint = ctx->pos; 2399*effe6ee7SSong Liu r5l_log_write_empty_meta_block(log, ctx->pos, ctx->seq++); 2400*effe6ee7SSong Liu ctx->pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 2401*effe6ee7SSong Liu } else if (r5c_recovery_rewrite_data_only_stripes(log, ctx)) { 24025aabf7c4SSong Liu pr_err("md/raid:%s: failed to rewrite stripes to journal\n", 24035aabf7c4SSong Liu mdname(mddev)); 2404*effe6ee7SSong Liu ret = -EIO; 2405*effe6ee7SSong Liu goto error; 24065aabf7c4SSong Liu } 24075aabf7c4SSong Liu 2408*effe6ee7SSong Liu log->log_start = ctx->pos; 2409*effe6ee7SSong Liu log->seq = ctx->seq; 241043b96748SJackieLiu log->last_checkpoint = pos; 241143b96748SJackieLiu r5l_write_super(log, pos); 2412a85dd7b8SSong Liu 2413*effe6ee7SSong Liu r5c_recovery_flush_data_only_stripes(log, ctx); 2414*effe6ee7SSong Liu ret = 0; 2415*effe6ee7SSong Liu error: 2416*effe6ee7SSong Liu r5l_recovery_free_ra_pool(log, ctx); 2417*effe6ee7SSong Liu ra_pool: 2418*effe6ee7SSong Liu __free_page(ctx->meta_page); 2419*effe6ee7SSong Liu meta_page: 2420*effe6ee7SSong Liu kfree(ctx); 2421*effe6ee7SSong Liu return ret; 2422f6bed0efSShaohua Li } 2423f6bed0efSShaohua Li 2424f6bed0efSShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp) 2425f6bed0efSShaohua Li { 2426f6bed0efSShaohua Li struct mddev *mddev = log->rdev->mddev; 2427f6bed0efSShaohua Li 2428f6bed0efSShaohua Li log->rdev->journal_tail = cp; 24292953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2430f6bed0efSShaohua Li } 2431f6bed0efSShaohua Li 24322c7da14bSSong Liu static ssize_t r5c_journal_mode_show(struct mddev *mddev, char *page) 24332c7da14bSSong Liu { 24342c7da14bSSong Liu struct r5conf *conf = mddev->private; 24352c7da14bSSong Liu int ret; 24362c7da14bSSong Liu 24372c7da14bSSong Liu if (!conf->log) 24382c7da14bSSong Liu return 0; 24392c7da14bSSong Liu 24402c7da14bSSong Liu switch (conf->log->r5c_journal_mode) { 24412c7da14bSSong Liu case R5C_JOURNAL_MODE_WRITE_THROUGH: 24422c7da14bSSong Liu ret = snprintf( 24432c7da14bSSong Liu page, PAGE_SIZE, "[%s] %s\n", 24442c7da14bSSong Liu r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], 24452c7da14bSSong Liu r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); 24462c7da14bSSong Liu break; 24472c7da14bSSong Liu case R5C_JOURNAL_MODE_WRITE_BACK: 24482c7da14bSSong Liu ret = snprintf( 24492c7da14bSSong Liu page, PAGE_SIZE, "%s [%s]\n", 24502c7da14bSSong Liu r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_THROUGH], 24512c7da14bSSong Liu r5c_journal_mode_str[R5C_JOURNAL_MODE_WRITE_BACK]); 24522c7da14bSSong Liu break; 24532c7da14bSSong Liu default: 24542c7da14bSSong Liu ret = 0; 24552c7da14bSSong Liu } 24562c7da14bSSong Liu return ret; 24572c7da14bSSong Liu } 24582c7da14bSSong Liu 24592c7da14bSSong Liu static ssize_t r5c_journal_mode_store(struct mddev *mddev, 24602c7da14bSSong Liu const char *page, size_t length) 24612c7da14bSSong Liu { 24622c7da14bSSong Liu struct r5conf *conf = mddev->private; 24632c7da14bSSong Liu struct r5l_log *log = conf->log; 24642c7da14bSSong Liu int val = -1, i; 24652c7da14bSSong Liu int len = length; 24662c7da14bSSong Liu 24672c7da14bSSong Liu if (!log) 24682c7da14bSSong Liu return -ENODEV; 24692c7da14bSSong Liu 24702c7da14bSSong Liu if (len && page[len - 1] == '\n') 24712c7da14bSSong Liu len -= 1; 24722c7da14bSSong Liu for (i = 0; i < ARRAY_SIZE(r5c_journal_mode_str); i++) 24732c7da14bSSong Liu if (strlen(r5c_journal_mode_str[i]) == len && 24742c7da14bSSong Liu strncmp(page, r5c_journal_mode_str[i], len) == 0) { 24752c7da14bSSong Liu val = i; 24762c7da14bSSong Liu break; 24772c7da14bSSong Liu } 24782c7da14bSSong Liu if (val < R5C_JOURNAL_MODE_WRITE_THROUGH || 24792c7da14bSSong Liu val > R5C_JOURNAL_MODE_WRITE_BACK) 24802c7da14bSSong Liu return -EINVAL; 24812c7da14bSSong Liu 24822e38a37fSSong Liu if (raid5_calc_degraded(conf) > 0 && 24832e38a37fSSong Liu val == R5C_JOURNAL_MODE_WRITE_BACK) 24842e38a37fSSong Liu return -EINVAL; 24852e38a37fSSong Liu 24862c7da14bSSong Liu mddev_suspend(mddev); 24872c7da14bSSong Liu conf->log->r5c_journal_mode = val; 24882c7da14bSSong Liu mddev_resume(mddev); 24892c7da14bSSong Liu 24902c7da14bSSong Liu pr_debug("md/raid:%s: setting r5c cache mode to %d: %s\n", 24912c7da14bSSong Liu mdname(mddev), val, r5c_journal_mode_str[val]); 24922c7da14bSSong Liu return length; 24932c7da14bSSong Liu } 24942c7da14bSSong Liu 24952c7da14bSSong Liu struct md_sysfs_entry 24962c7da14bSSong Liu r5c_journal_mode = __ATTR(journal_mode, 0644, 24972c7da14bSSong Liu r5c_journal_mode_show, r5c_journal_mode_store); 24982c7da14bSSong Liu 24992ded3703SSong Liu /* 25002ded3703SSong Liu * Try handle write operation in caching phase. This function should only 25012ded3703SSong Liu * be called in write-back mode. 25022ded3703SSong Liu * 25032ded3703SSong Liu * If all outstanding writes can be handled in caching phase, returns 0 25042ded3703SSong Liu * If writes requires write-out phase, call r5c_make_stripe_write_out() 25052ded3703SSong Liu * and returns -EAGAIN 25062ded3703SSong Liu */ 25072ded3703SSong Liu int r5c_try_caching_write(struct r5conf *conf, 25082ded3703SSong Liu struct stripe_head *sh, 25092ded3703SSong Liu struct stripe_head_state *s, 25102ded3703SSong Liu int disks) 25112ded3703SSong Liu { 25122ded3703SSong Liu struct r5l_log *log = conf->log; 25131e6d690bSSong Liu int i; 25141e6d690bSSong Liu struct r5dev *dev; 25151e6d690bSSong Liu int to_cache = 0; 251603b047f4SSong Liu void **pslot; 251703b047f4SSong Liu sector_t tree_index; 251803b047f4SSong Liu int ret; 251903b047f4SSong Liu uintptr_t refcount; 25202ded3703SSong Liu 25212ded3703SSong Liu BUG_ON(!r5c_is_writeback(log)); 25222ded3703SSong Liu 25231e6d690bSSong Liu if (!test_bit(STRIPE_R5C_CACHING, &sh->state)) { 25241e6d690bSSong Liu /* 25251e6d690bSSong Liu * There are two different scenarios here: 25261e6d690bSSong Liu * 1. The stripe has some data cached, and it is sent to 25271e6d690bSSong Liu * write-out phase for reclaim 25281e6d690bSSong Liu * 2. The stripe is clean, and this is the first write 25291e6d690bSSong Liu * 25301e6d690bSSong Liu * For 1, return -EAGAIN, so we continue with 25311e6d690bSSong Liu * handle_stripe_dirtying(). 25321e6d690bSSong Liu * 25331e6d690bSSong Liu * For 2, set STRIPE_R5C_CACHING and continue with caching 25341e6d690bSSong Liu * write. 25351e6d690bSSong Liu */ 25361e6d690bSSong Liu 25371e6d690bSSong Liu /* case 1: anything injournal or anything in written */ 25381e6d690bSSong Liu if (s->injournal > 0 || s->written > 0) 25391e6d690bSSong Liu return -EAGAIN; 25401e6d690bSSong Liu /* case 2 */ 25411e6d690bSSong Liu set_bit(STRIPE_R5C_CACHING, &sh->state); 25421e6d690bSSong Liu } 25431e6d690bSSong Liu 25442e38a37fSSong Liu /* 25452e38a37fSSong Liu * When run in degraded mode, array is set to write-through mode. 25462e38a37fSSong Liu * This check helps drain pending write safely in the transition to 25472e38a37fSSong Liu * write-through mode. 25482e38a37fSSong Liu */ 25492e38a37fSSong Liu if (s->failed) { 25502e38a37fSSong Liu r5c_make_stripe_write_out(sh); 25512e38a37fSSong Liu return -EAGAIN; 25522e38a37fSSong Liu } 25532e38a37fSSong Liu 25541e6d690bSSong Liu for (i = disks; i--; ) { 25551e6d690bSSong Liu dev = &sh->dev[i]; 25561e6d690bSSong Liu /* if non-overwrite, use writing-out phase */ 25571e6d690bSSong Liu if (dev->towrite && !test_bit(R5_OVERWRITE, &dev->flags) && 25581e6d690bSSong Liu !test_bit(R5_InJournal, &dev->flags)) { 25592ded3703SSong Liu r5c_make_stripe_write_out(sh); 25602ded3703SSong Liu return -EAGAIN; 25612ded3703SSong Liu } 25621e6d690bSSong Liu } 25631e6d690bSSong Liu 256403b047f4SSong Liu /* if the stripe is not counted in big_stripe_tree, add it now */ 256503b047f4SSong Liu if (!test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) && 256603b047f4SSong Liu !test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { 256703b047f4SSong Liu tree_index = r5c_tree_index(conf, sh->sector); 256803b047f4SSong Liu spin_lock(&log->tree_lock); 256903b047f4SSong Liu pslot = radix_tree_lookup_slot(&log->big_stripe_tree, 257003b047f4SSong Liu tree_index); 257103b047f4SSong Liu if (pslot) { 257203b047f4SSong Liu refcount = (uintptr_t)radix_tree_deref_slot_protected( 257303b047f4SSong Liu pslot, &log->tree_lock) >> 257403b047f4SSong Liu R5C_RADIX_COUNT_SHIFT; 257503b047f4SSong Liu radix_tree_replace_slot( 257603b047f4SSong Liu &log->big_stripe_tree, pslot, 257703b047f4SSong Liu (void *)((refcount + 1) << R5C_RADIX_COUNT_SHIFT)); 257803b047f4SSong Liu } else { 257903b047f4SSong Liu /* 258003b047f4SSong Liu * this radix_tree_insert can fail safely, so no 258103b047f4SSong Liu * need to call radix_tree_preload() 258203b047f4SSong Liu */ 258303b047f4SSong Liu ret = radix_tree_insert( 258403b047f4SSong Liu &log->big_stripe_tree, tree_index, 258503b047f4SSong Liu (void *)(1 << R5C_RADIX_COUNT_SHIFT)); 258603b047f4SSong Liu if (ret) { 258703b047f4SSong Liu spin_unlock(&log->tree_lock); 258803b047f4SSong Liu r5c_make_stripe_write_out(sh); 258903b047f4SSong Liu return -EAGAIN; 259003b047f4SSong Liu } 259103b047f4SSong Liu } 259203b047f4SSong Liu spin_unlock(&log->tree_lock); 259303b047f4SSong Liu 259403b047f4SSong Liu /* 259503b047f4SSong Liu * set STRIPE_R5C_PARTIAL_STRIPE, this shows the stripe is 259603b047f4SSong Liu * counted in the radix tree 259703b047f4SSong Liu */ 259803b047f4SSong Liu set_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state); 259903b047f4SSong Liu atomic_inc(&conf->r5c_cached_partial_stripes); 260003b047f4SSong Liu } 260103b047f4SSong Liu 26021e6d690bSSong Liu for (i = disks; i--; ) { 26031e6d690bSSong Liu dev = &sh->dev[i]; 26041e6d690bSSong Liu if (dev->towrite) { 26051e6d690bSSong Liu set_bit(R5_Wantwrite, &dev->flags); 26061e6d690bSSong Liu set_bit(R5_Wantdrain, &dev->flags); 26071e6d690bSSong Liu set_bit(R5_LOCKED, &dev->flags); 26081e6d690bSSong Liu to_cache++; 26091e6d690bSSong Liu } 26101e6d690bSSong Liu } 26111e6d690bSSong Liu 26121e6d690bSSong Liu if (to_cache) { 26131e6d690bSSong Liu set_bit(STRIPE_OP_BIODRAIN, &s->ops_request); 26141e6d690bSSong Liu /* 26151e6d690bSSong Liu * set STRIPE_LOG_TRAPPED, which triggers r5c_cache_data() 26161e6d690bSSong Liu * in ops_run_io(). STRIPE_LOG_TRAPPED will be cleared in 26171e6d690bSSong Liu * r5c_handle_data_cached() 26181e6d690bSSong Liu */ 26191e6d690bSSong Liu set_bit(STRIPE_LOG_TRAPPED, &sh->state); 26201e6d690bSSong Liu } 26211e6d690bSSong Liu 26221e6d690bSSong Liu return 0; 26231e6d690bSSong Liu } 26241e6d690bSSong Liu 26251e6d690bSSong Liu /* 26261e6d690bSSong Liu * free extra pages (orig_page) we allocated for prexor 26271e6d690bSSong Liu */ 26281e6d690bSSong Liu void r5c_release_extra_page(struct stripe_head *sh) 26291e6d690bSSong Liu { 2630d7bd398eSSong Liu struct r5conf *conf = sh->raid_conf; 26311e6d690bSSong Liu int i; 2632d7bd398eSSong Liu bool using_disk_info_extra_page; 2633d7bd398eSSong Liu 2634d7bd398eSSong Liu using_disk_info_extra_page = 2635d7bd398eSSong Liu sh->dev[0].orig_page == conf->disks[0].extra_page; 26361e6d690bSSong Liu 26371e6d690bSSong Liu for (i = sh->disks; i--; ) 26381e6d690bSSong Liu if (sh->dev[i].page != sh->dev[i].orig_page) { 26391e6d690bSSong Liu struct page *p = sh->dev[i].orig_page; 26401e6d690bSSong Liu 26411e6d690bSSong Liu sh->dev[i].orig_page = sh->dev[i].page; 264286aa1397SSong Liu clear_bit(R5_OrigPageUPTDODATE, &sh->dev[i].flags); 264386aa1397SSong Liu 2644d7bd398eSSong Liu if (!using_disk_info_extra_page) 26451e6d690bSSong Liu put_page(p); 26461e6d690bSSong Liu } 2647d7bd398eSSong Liu 2648d7bd398eSSong Liu if (using_disk_info_extra_page) { 2649d7bd398eSSong Liu clear_bit(R5C_EXTRA_PAGE_IN_USE, &conf->cache_state); 2650d7bd398eSSong Liu md_wakeup_thread(conf->mddev->thread); 2651d7bd398eSSong Liu } 2652d7bd398eSSong Liu } 2653d7bd398eSSong Liu 2654d7bd398eSSong Liu void r5c_use_extra_page(struct stripe_head *sh) 2655d7bd398eSSong Liu { 2656d7bd398eSSong Liu struct r5conf *conf = sh->raid_conf; 2657d7bd398eSSong Liu int i; 2658d7bd398eSSong Liu struct r5dev *dev; 2659d7bd398eSSong Liu 2660d7bd398eSSong Liu for (i = sh->disks; i--; ) { 2661d7bd398eSSong Liu dev = &sh->dev[i]; 2662d7bd398eSSong Liu if (dev->orig_page != dev->page) 2663d7bd398eSSong Liu put_page(dev->orig_page); 2664d7bd398eSSong Liu dev->orig_page = conf->disks[i].extra_page; 2665d7bd398eSSong Liu } 26661e6d690bSSong Liu } 26672ded3703SSong Liu 26682ded3703SSong Liu /* 26692ded3703SSong Liu * clean up the stripe (clear R5_InJournal for dev[pd_idx] etc.) after the 26702ded3703SSong Liu * stripe is committed to RAID disks. 26712ded3703SSong Liu */ 26722ded3703SSong Liu void r5c_finish_stripe_write_out(struct r5conf *conf, 26732ded3703SSong Liu struct stripe_head *sh, 26742ded3703SSong Liu struct stripe_head_state *s) 26752ded3703SSong Liu { 267603b047f4SSong Liu struct r5l_log *log = conf->log; 26771e6d690bSSong Liu int i; 26781e6d690bSSong Liu int do_wakeup = 0; 267903b047f4SSong Liu sector_t tree_index; 268003b047f4SSong Liu void **pslot; 268103b047f4SSong Liu uintptr_t refcount; 26821e6d690bSSong Liu 268303b047f4SSong Liu if (!log || !test_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags)) 26842ded3703SSong Liu return; 26852ded3703SSong Liu 26862ded3703SSong Liu WARN_ON(test_bit(STRIPE_R5C_CACHING, &sh->state)); 26872ded3703SSong Liu clear_bit(R5_InJournal, &sh->dev[sh->pd_idx].flags); 26882ded3703SSong Liu 268903b047f4SSong Liu if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) 26902ded3703SSong Liu return; 26911e6d690bSSong Liu 26921e6d690bSSong Liu for (i = sh->disks; i--; ) { 26931e6d690bSSong Liu clear_bit(R5_InJournal, &sh->dev[i].flags); 26941e6d690bSSong Liu if (test_and_clear_bit(R5_Overlap, &sh->dev[i].flags)) 26951e6d690bSSong Liu do_wakeup = 1; 26961e6d690bSSong Liu } 26971e6d690bSSong Liu 26981e6d690bSSong Liu /* 26991e6d690bSSong Liu * analyse_stripe() runs before r5c_finish_stripe_write_out(), 27001e6d690bSSong Liu * We updated R5_InJournal, so we also update s->injournal. 27011e6d690bSSong Liu */ 27021e6d690bSSong Liu s->injournal = 0; 27031e6d690bSSong Liu 27041e6d690bSSong Liu if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state)) 27051e6d690bSSong Liu if (atomic_dec_and_test(&conf->pending_full_writes)) 27061e6d690bSSong Liu md_wakeup_thread(conf->mddev->thread); 27071e6d690bSSong Liu 27081e6d690bSSong Liu if (do_wakeup) 27091e6d690bSSong Liu wake_up(&conf->wait_for_overlap); 2710a39f7afdSSong Liu 271103b047f4SSong Liu spin_lock_irq(&log->stripe_in_journal_lock); 2712a39f7afdSSong Liu list_del_init(&sh->r5c); 271303b047f4SSong Liu spin_unlock_irq(&log->stripe_in_journal_lock); 2714a39f7afdSSong Liu sh->log_start = MaxSector; 271503b047f4SSong Liu 271603b047f4SSong Liu atomic_dec(&log->stripe_in_journal_count); 271703b047f4SSong Liu r5c_update_log_state(log); 271803b047f4SSong Liu 271903b047f4SSong Liu /* stop counting this stripe in big_stripe_tree */ 272003b047f4SSong Liu if (test_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state) || 272103b047f4SSong Liu test_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { 272203b047f4SSong Liu tree_index = r5c_tree_index(conf, sh->sector); 272303b047f4SSong Liu spin_lock(&log->tree_lock); 272403b047f4SSong Liu pslot = radix_tree_lookup_slot(&log->big_stripe_tree, 272503b047f4SSong Liu tree_index); 272603b047f4SSong Liu BUG_ON(pslot == NULL); 272703b047f4SSong Liu refcount = (uintptr_t)radix_tree_deref_slot_protected( 272803b047f4SSong Liu pslot, &log->tree_lock) >> 272903b047f4SSong Liu R5C_RADIX_COUNT_SHIFT; 273003b047f4SSong Liu if (refcount == 1) 273103b047f4SSong Liu radix_tree_delete(&log->big_stripe_tree, tree_index); 273203b047f4SSong Liu else 273303b047f4SSong Liu radix_tree_replace_slot( 273403b047f4SSong Liu &log->big_stripe_tree, pslot, 273503b047f4SSong Liu (void *)((refcount - 1) << R5C_RADIX_COUNT_SHIFT)); 273603b047f4SSong Liu spin_unlock(&log->tree_lock); 273703b047f4SSong Liu } 273803b047f4SSong Liu 273903b047f4SSong Liu if (test_and_clear_bit(STRIPE_R5C_PARTIAL_STRIPE, &sh->state)) { 274003b047f4SSong Liu BUG_ON(atomic_read(&conf->r5c_cached_partial_stripes) == 0); 2741e33fbb9cSShaohua Li atomic_dec(&conf->r5c_flushing_partial_stripes); 274203b047f4SSong Liu atomic_dec(&conf->r5c_cached_partial_stripes); 274303b047f4SSong Liu } 274403b047f4SSong Liu 274503b047f4SSong Liu if (test_and_clear_bit(STRIPE_R5C_FULL_STRIPE, &sh->state)) { 274603b047f4SSong Liu BUG_ON(atomic_read(&conf->r5c_cached_full_stripes) == 0); 2747e33fbb9cSShaohua Li atomic_dec(&conf->r5c_flushing_full_stripes); 274803b047f4SSong Liu atomic_dec(&conf->r5c_cached_full_stripes); 274903b047f4SSong Liu } 27501e6d690bSSong Liu } 27511e6d690bSSong Liu 27521e6d690bSSong Liu int 27531e6d690bSSong Liu r5c_cache_data(struct r5l_log *log, struct stripe_head *sh, 27541e6d690bSSong Liu struct stripe_head_state *s) 27551e6d690bSSong Liu { 2756a39f7afdSSong Liu struct r5conf *conf = sh->raid_conf; 27571e6d690bSSong Liu int pages = 0; 27581e6d690bSSong Liu int reserve; 27591e6d690bSSong Liu int i; 27601e6d690bSSong Liu int ret = 0; 27611e6d690bSSong Liu 27621e6d690bSSong Liu BUG_ON(!log); 27631e6d690bSSong Liu 27641e6d690bSSong Liu for (i = 0; i < sh->disks; i++) { 27651e6d690bSSong Liu void *addr; 27661e6d690bSSong Liu 27671e6d690bSSong Liu if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) 27681e6d690bSSong Liu continue; 27691e6d690bSSong Liu addr = kmap_atomic(sh->dev[i].page); 27701e6d690bSSong Liu sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, 27711e6d690bSSong Liu addr, PAGE_SIZE); 27721e6d690bSSong Liu kunmap_atomic(addr); 27731e6d690bSSong Liu pages++; 27741e6d690bSSong Liu } 27751e6d690bSSong Liu WARN_ON(pages == 0); 27761e6d690bSSong Liu 27771e6d690bSSong Liu /* 27781e6d690bSSong Liu * The stripe must enter state machine again to call endio, so 27791e6d690bSSong Liu * don't delay. 27801e6d690bSSong Liu */ 27811e6d690bSSong Liu clear_bit(STRIPE_DELAYED, &sh->state); 27821e6d690bSSong Liu atomic_inc(&sh->count); 27831e6d690bSSong Liu 27841e6d690bSSong Liu mutex_lock(&log->io_mutex); 27851e6d690bSSong Liu /* meta + data */ 27861e6d690bSSong Liu reserve = (1 + pages) << (PAGE_SHIFT - 9); 27871e6d690bSSong Liu 2788a39f7afdSSong Liu if (test_bit(R5C_LOG_CRITICAL, &conf->cache_state) && 2789a39f7afdSSong Liu sh->log_start == MaxSector) 2790a39f7afdSSong Liu r5l_add_no_space_stripe(log, sh); 2791a39f7afdSSong Liu else if (!r5l_has_free_space(log, reserve)) { 2792a39f7afdSSong Liu if (sh->log_start == log->last_checkpoint) 2793a39f7afdSSong Liu BUG(); 2794a39f7afdSSong Liu else 2795a39f7afdSSong Liu r5l_add_no_space_stripe(log, sh); 27961e6d690bSSong Liu } else { 27971e6d690bSSong Liu ret = r5l_log_stripe(log, sh, pages, 0); 27981e6d690bSSong Liu if (ret) { 27991e6d690bSSong Liu spin_lock_irq(&log->io_list_lock); 28001e6d690bSSong Liu list_add_tail(&sh->log_list, &log->no_mem_stripes); 28011e6d690bSSong Liu spin_unlock_irq(&log->io_list_lock); 28021e6d690bSSong Liu } 28031e6d690bSSong Liu } 28041e6d690bSSong Liu 28051e6d690bSSong Liu mutex_unlock(&log->io_mutex); 28061e6d690bSSong Liu return 0; 2807f6bed0efSShaohua Li } 2808f6bed0efSShaohua Li 280903b047f4SSong Liu /* check whether this big stripe is in write back cache. */ 281003b047f4SSong Liu bool r5c_big_stripe_cached(struct r5conf *conf, sector_t sect) 281103b047f4SSong Liu { 281203b047f4SSong Liu struct r5l_log *log = conf->log; 281303b047f4SSong Liu sector_t tree_index; 281403b047f4SSong Liu void *slot; 281503b047f4SSong Liu 281603b047f4SSong Liu if (!log) 281703b047f4SSong Liu return false; 281803b047f4SSong Liu 281903b047f4SSong Liu WARN_ON_ONCE(!rcu_read_lock_held()); 282003b047f4SSong Liu tree_index = r5c_tree_index(conf, sect); 282103b047f4SSong Liu slot = radix_tree_lookup(&log->big_stripe_tree, tree_index); 282203b047f4SSong Liu return slot != NULL; 282303b047f4SSong Liu } 282403b047f4SSong Liu 2825f6bed0efSShaohua Li static int r5l_load_log(struct r5l_log *log) 2826f6bed0efSShaohua Li { 2827f6bed0efSShaohua Li struct md_rdev *rdev = log->rdev; 2828f6bed0efSShaohua Li struct page *page; 2829f6bed0efSShaohua Li struct r5l_meta_block *mb; 2830f6bed0efSShaohua Li sector_t cp = log->rdev->journal_tail; 2831f6bed0efSShaohua Li u32 stored_crc, expected_crc; 2832f6bed0efSShaohua Li bool create_super = false; 2833d30dfeb9SJackieLiu int ret = 0; 2834f6bed0efSShaohua Li 2835f6bed0efSShaohua Li /* Make sure it's valid */ 2836f6bed0efSShaohua Li if (cp >= rdev->sectors || round_down(cp, BLOCK_SECTORS) != cp) 2837f6bed0efSShaohua Li cp = 0; 2838f6bed0efSShaohua Li page = alloc_page(GFP_KERNEL); 2839f6bed0efSShaohua Li if (!page) 2840f6bed0efSShaohua Li return -ENOMEM; 2841f6bed0efSShaohua Li 2842796a5cf0SMike Christie if (!sync_page_io(rdev, cp, PAGE_SIZE, page, REQ_OP_READ, 0, false)) { 2843f6bed0efSShaohua Li ret = -EIO; 2844f6bed0efSShaohua Li goto ioerr; 2845f6bed0efSShaohua Li } 2846f6bed0efSShaohua Li mb = page_address(page); 2847f6bed0efSShaohua Li 2848f6bed0efSShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 2849f6bed0efSShaohua Li mb->version != R5LOG_VERSION) { 2850f6bed0efSShaohua Li create_super = true; 2851f6bed0efSShaohua Li goto create; 2852f6bed0efSShaohua Li } 2853f6bed0efSShaohua Li stored_crc = le32_to_cpu(mb->checksum); 2854f6bed0efSShaohua Li mb->checksum = 0; 28555cb2fbd6SShaohua Li expected_crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 2856f6bed0efSShaohua Li if (stored_crc != expected_crc) { 2857f6bed0efSShaohua Li create_super = true; 2858f6bed0efSShaohua Li goto create; 2859f6bed0efSShaohua Li } 2860f6bed0efSShaohua Li if (le64_to_cpu(mb->position) != cp) { 2861f6bed0efSShaohua Li create_super = true; 2862f6bed0efSShaohua Li goto create; 2863f6bed0efSShaohua Li } 2864f6bed0efSShaohua Li create: 2865f6bed0efSShaohua Li if (create_super) { 2866f6bed0efSShaohua Li log->last_cp_seq = prandom_u32(); 2867f6bed0efSShaohua Li cp = 0; 286856056c2eSZhengyuan Liu r5l_log_write_empty_meta_block(log, cp, log->last_cp_seq); 2869f6bed0efSShaohua Li /* 2870f6bed0efSShaohua Li * Make sure super points to correct address. Log might have 2871f6bed0efSShaohua Li * data very soon. If super hasn't correct log tail address, 2872f6bed0efSShaohua Li * recovery can't find the log 2873f6bed0efSShaohua Li */ 2874f6bed0efSShaohua Li r5l_write_super(log, cp); 2875f6bed0efSShaohua Li } else 2876f6bed0efSShaohua Li log->last_cp_seq = le64_to_cpu(mb->seq); 2877f6bed0efSShaohua Li 2878f6bed0efSShaohua Li log->device_size = round_down(rdev->sectors, BLOCK_SECTORS); 28790576b1c6SShaohua Li log->max_free_space = log->device_size >> RECLAIM_MAX_FREE_SPACE_SHIFT; 28800576b1c6SShaohua Li if (log->max_free_space > RECLAIM_MAX_FREE_SPACE) 28810576b1c6SShaohua Li log->max_free_space = RECLAIM_MAX_FREE_SPACE; 2882f6bed0efSShaohua Li log->last_checkpoint = cp; 2883f6bed0efSShaohua Li 2884f6bed0efSShaohua Li __free_page(page); 2885f6bed0efSShaohua Li 2886d30dfeb9SJackieLiu if (create_super) { 2887d30dfeb9SJackieLiu log->log_start = r5l_ring_add(log, cp, BLOCK_SECTORS); 2888d30dfeb9SJackieLiu log->seq = log->last_cp_seq + 1; 2889d30dfeb9SJackieLiu log->next_checkpoint = cp; 2890d30dfeb9SJackieLiu } else 28913d7e7e1dSZhengyuan Liu ret = r5l_recovery_log(log); 2892d30dfeb9SJackieLiu 28933d7e7e1dSZhengyuan Liu r5c_update_log_state(log); 28943d7e7e1dSZhengyuan Liu return ret; 2895f6bed0efSShaohua Li ioerr: 2896f6bed0efSShaohua Li __free_page(page); 2897f6bed0efSShaohua Li return ret; 2898f6bed0efSShaohua Li } 2899f6bed0efSShaohua Li 29002e38a37fSSong Liu void r5c_update_on_rdev_error(struct mddev *mddev) 29012e38a37fSSong Liu { 29022e38a37fSSong Liu struct r5conf *conf = mddev->private; 29032e38a37fSSong Liu struct r5l_log *log = conf->log; 29042e38a37fSSong Liu 29052e38a37fSSong Liu if (!log) 29062e38a37fSSong Liu return; 29072e38a37fSSong Liu 29082e38a37fSSong Liu if (raid5_calc_degraded(conf) > 0 && 29092e38a37fSSong Liu conf->log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_BACK) 29102e38a37fSSong Liu schedule_work(&log->disable_writeback_work); 29112e38a37fSSong Liu } 29122e38a37fSSong Liu 2913f6bed0efSShaohua Li int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) 2914f6bed0efSShaohua Li { 2915c888a8f9SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 2916f6bed0efSShaohua Li struct r5l_log *log; 2917f6bed0efSShaohua Li 2918f6bed0efSShaohua Li if (PAGE_SIZE != 4096) 2919f6bed0efSShaohua Li return -EINVAL; 2920c757ec95SSong Liu 2921c757ec95SSong Liu /* 2922c757ec95SSong Liu * The PAGE_SIZE must be big enough to hold 1 r5l_meta_block and 2923c757ec95SSong Liu * raid_disks r5l_payload_data_parity. 2924c757ec95SSong Liu * 2925c757ec95SSong Liu * Write journal and cache does not work for very big array 2926c757ec95SSong Liu * (raid_disks > 203) 2927c757ec95SSong Liu */ 2928c757ec95SSong Liu if (sizeof(struct r5l_meta_block) + 2929c757ec95SSong Liu ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) * 2930c757ec95SSong Liu conf->raid_disks) > PAGE_SIZE) { 2931c757ec95SSong Liu pr_err("md/raid:%s: write journal/cache doesn't work for array with %d disks\n", 2932c757ec95SSong Liu mdname(conf->mddev), conf->raid_disks); 2933c757ec95SSong Liu return -EINVAL; 2934c757ec95SSong Liu } 2935c757ec95SSong Liu 2936f6bed0efSShaohua Li log = kzalloc(sizeof(*log), GFP_KERNEL); 2937f6bed0efSShaohua Li if (!log) 2938f6bed0efSShaohua Li return -ENOMEM; 2939f6bed0efSShaohua Li log->rdev = rdev; 2940f6bed0efSShaohua Li 2941c888a8f9SJens Axboe log->need_cache_flush = test_bit(QUEUE_FLAG_WC, &q->queue_flags) != 0; 294256fef7c6SChristoph Hellwig 29435cb2fbd6SShaohua Li log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, 2944f6bed0efSShaohua Li sizeof(rdev->mddev->uuid)); 2945f6bed0efSShaohua Li 2946f6bed0efSShaohua Li mutex_init(&log->io_mutex); 2947f6bed0efSShaohua Li 2948f6bed0efSShaohua Li spin_lock_init(&log->io_list_lock); 2949f6bed0efSShaohua Li INIT_LIST_HEAD(&log->running_ios); 29500576b1c6SShaohua Li INIT_LIST_HEAD(&log->io_end_ios); 2951a8c34f91SShaohua Li INIT_LIST_HEAD(&log->flushing_ios); 295204732f74SChristoph Hellwig INIT_LIST_HEAD(&log->finished_ios); 29533a83f467SMing Lei bio_init(&log->flush_bio, NULL, 0); 2954f6bed0efSShaohua Li 2955f6bed0efSShaohua Li log->io_kc = KMEM_CACHE(r5l_io_unit, 0); 2956f6bed0efSShaohua Li if (!log->io_kc) 2957f6bed0efSShaohua Li goto io_kc; 2958f6bed0efSShaohua Li 29595036c390SChristoph Hellwig log->io_pool = mempool_create_slab_pool(R5L_POOL_SIZE, log->io_kc); 29605036c390SChristoph Hellwig if (!log->io_pool) 29615036c390SChristoph Hellwig goto io_pool; 29625036c390SChristoph Hellwig 2963c38d29b3SChristoph Hellwig log->bs = bioset_create(R5L_POOL_SIZE, 0); 2964c38d29b3SChristoph Hellwig if (!log->bs) 2965c38d29b3SChristoph Hellwig goto io_bs; 2966c38d29b3SChristoph Hellwig 2967e8deb638SChristoph Hellwig log->meta_pool = mempool_create_page_pool(R5L_POOL_SIZE, 0); 2968e8deb638SChristoph Hellwig if (!log->meta_pool) 2969e8deb638SChristoph Hellwig goto out_mempool; 2970e8deb638SChristoph Hellwig 297103b047f4SSong Liu spin_lock_init(&log->tree_lock); 297203b047f4SSong Liu INIT_RADIX_TREE(&log->big_stripe_tree, GFP_NOWAIT | __GFP_NOWARN); 297303b047f4SSong Liu 29740576b1c6SShaohua Li log->reclaim_thread = md_register_thread(r5l_reclaim_thread, 29750576b1c6SShaohua Li log->rdev->mddev, "reclaim"); 29760576b1c6SShaohua Li if (!log->reclaim_thread) 29770576b1c6SShaohua Li goto reclaim_thread; 2978a39f7afdSSong Liu log->reclaim_thread->timeout = R5C_RECLAIM_WAKEUP_INTERVAL; 2979a39f7afdSSong Liu 29800fd22b45SShaohua Li init_waitqueue_head(&log->iounit_wait); 29810576b1c6SShaohua Li 29825036c390SChristoph Hellwig INIT_LIST_HEAD(&log->no_mem_stripes); 29835036c390SChristoph Hellwig 2984f6bed0efSShaohua Li INIT_LIST_HEAD(&log->no_space_stripes); 2985f6bed0efSShaohua Li spin_lock_init(&log->no_space_stripes_lock); 2986f6bed0efSShaohua Li 29873bddb7f8SSong Liu INIT_WORK(&log->deferred_io_work, r5l_submit_io_async); 29882e38a37fSSong Liu INIT_WORK(&log->disable_writeback_work, r5c_disable_writeback_async); 29893bddb7f8SSong Liu 29902ded3703SSong Liu log->r5c_journal_mode = R5C_JOURNAL_MODE_WRITE_THROUGH; 2991a39f7afdSSong Liu INIT_LIST_HEAD(&log->stripe_in_journal_list); 2992a39f7afdSSong Liu spin_lock_init(&log->stripe_in_journal_lock); 2993a39f7afdSSong Liu atomic_set(&log->stripe_in_journal_count, 0); 29942ded3703SSong Liu 2995d2250f10SSong Liu rcu_assign_pointer(conf->log, log); 2996d2250f10SSong Liu 2997f6bed0efSShaohua Li if (r5l_load_log(log)) 2998f6bed0efSShaohua Li goto error; 2999f6bed0efSShaohua Li 3000a62ab49eSShaohua Li set_bit(MD_HAS_JOURNAL, &conf->mddev->flags); 3001f6bed0efSShaohua Li return 0; 3002e8deb638SChristoph Hellwig 3003f6bed0efSShaohua Li error: 3004d2250f10SSong Liu rcu_assign_pointer(conf->log, NULL); 30050576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 30060576b1c6SShaohua Li reclaim_thread: 3007e8deb638SChristoph Hellwig mempool_destroy(log->meta_pool); 3008e8deb638SChristoph Hellwig out_mempool: 3009c38d29b3SChristoph Hellwig bioset_free(log->bs); 3010c38d29b3SChristoph Hellwig io_bs: 30115036c390SChristoph Hellwig mempool_destroy(log->io_pool); 30125036c390SChristoph Hellwig io_pool: 3013f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 3014f6bed0efSShaohua Li io_kc: 3015f6bed0efSShaohua Li kfree(log); 3016f6bed0efSShaohua Li return -EINVAL; 3017f6bed0efSShaohua Li } 3018f6bed0efSShaohua Li 3019f6bed0efSShaohua Li void r5l_exit_log(struct r5l_log *log) 3020f6bed0efSShaohua Li { 30212e38a37fSSong Liu flush_work(&log->disable_writeback_work); 30220576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 3023e8deb638SChristoph Hellwig mempool_destroy(log->meta_pool); 3024c38d29b3SChristoph Hellwig bioset_free(log->bs); 30255036c390SChristoph Hellwig mempool_destroy(log->io_pool); 3026f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 3027f6bed0efSShaohua Li kfree(log); 3028f6bed0efSShaohua Li } 3029