1f6bed0efSShaohua Li /* 2f6bed0efSShaohua Li * Copyright (C) 2015 Shaohua Li <shli@fb.com> 3f6bed0efSShaohua Li * 4f6bed0efSShaohua Li * This program is free software; you can redistribute it and/or modify it 5f6bed0efSShaohua Li * under the terms and conditions of the GNU General Public License, 6f6bed0efSShaohua Li * version 2, as published by the Free Software Foundation. 7f6bed0efSShaohua Li * 8f6bed0efSShaohua Li * This program is distributed in the hope it will be useful, but WITHOUT 9f6bed0efSShaohua Li * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10f6bed0efSShaohua Li * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11f6bed0efSShaohua Li * more details. 12f6bed0efSShaohua Li * 13f6bed0efSShaohua Li */ 14f6bed0efSShaohua Li #include <linux/kernel.h> 15f6bed0efSShaohua Li #include <linux/wait.h> 16f6bed0efSShaohua Li #include <linux/blkdev.h> 17f6bed0efSShaohua Li #include <linux/slab.h> 18f6bed0efSShaohua Li #include <linux/raid/md_p.h> 19*5cb2fbd6SShaohua Li #include <linux/crc32c.h> 20f6bed0efSShaohua Li #include <linux/random.h> 21f6bed0efSShaohua Li #include "md.h" 22f6bed0efSShaohua Li #include "raid5.h" 23f6bed0efSShaohua Li 24f6bed0efSShaohua Li /* 25f6bed0efSShaohua Li * metadata/data stored in disk with 4k size unit (a block) regardless 26f6bed0efSShaohua Li * underneath hardware sector size. only works with PAGE_SIZE == 4096 27f6bed0efSShaohua Li */ 28f6bed0efSShaohua Li #define BLOCK_SECTORS (8) 29f6bed0efSShaohua Li 300576b1c6SShaohua Li /* 310576b1c6SShaohua Li * reclaim runs every 1/4 disk size or 10G reclaimable space. This can prevent 320576b1c6SShaohua Li * recovery scans a very long log 330576b1c6SShaohua Li */ 340576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE (10 * 1024 * 1024 * 2) /* sector */ 350576b1c6SShaohua Li #define RECLAIM_MAX_FREE_SPACE_SHIFT (2) 360576b1c6SShaohua Li 37f6bed0efSShaohua Li struct r5l_log { 38f6bed0efSShaohua Li struct md_rdev *rdev; 39f6bed0efSShaohua Li 40f6bed0efSShaohua Li u32 uuid_checksum; 41f6bed0efSShaohua Li 42f6bed0efSShaohua Li sector_t device_size; /* log device size, round to 43f6bed0efSShaohua Li * BLOCK_SECTORS */ 440576b1c6SShaohua Li sector_t max_free_space; /* reclaim run if free space is at 450576b1c6SShaohua Li * this size */ 46f6bed0efSShaohua Li 47f6bed0efSShaohua Li sector_t last_checkpoint; /* log tail. where recovery scan 48f6bed0efSShaohua Li * starts from */ 49f6bed0efSShaohua Li u64 last_cp_seq; /* log tail sequence */ 50f6bed0efSShaohua Li 51f6bed0efSShaohua Li sector_t log_start; /* log head. where new data appends */ 52f6bed0efSShaohua Li u64 seq; /* log head sequence */ 53f6bed0efSShaohua Li 54f6bed0efSShaohua Li struct mutex io_mutex; 55f6bed0efSShaohua Li struct r5l_io_unit *current_io; /* current io_unit accepting new data */ 56f6bed0efSShaohua Li 57f6bed0efSShaohua Li spinlock_t io_list_lock; 58f6bed0efSShaohua Li struct list_head running_ios; /* io_units which are still running, 59f6bed0efSShaohua Li * and have not yet been completely 60f6bed0efSShaohua Li * written to the log */ 61f6bed0efSShaohua Li struct list_head io_end_ios; /* io_units which have been completely 62f6bed0efSShaohua Li * written to the log but not yet written 63f6bed0efSShaohua Li * to the RAID */ 640576b1c6SShaohua Li struct list_head stripe_end_ios;/* io_units which have been completely 650576b1c6SShaohua Li * written to the RAID but have not yet 660576b1c6SShaohua Li * been considered for updating super */ 67f6bed0efSShaohua Li 68f6bed0efSShaohua Li struct kmem_cache *io_kc; 69f6bed0efSShaohua Li 700576b1c6SShaohua Li struct md_thread *reclaim_thread; 710576b1c6SShaohua Li unsigned long reclaim_target; /* number of space that need to be 720576b1c6SShaohua Li * reclaimed. if it's 0, reclaim spaces 730576b1c6SShaohua Li * used by io_units which are in 740576b1c6SShaohua Li * IO_UNIT_STRIPE_END state (eg, reclaim 750576b1c6SShaohua Li * dones't wait for specific io_unit 760576b1c6SShaohua Li * switching to IO_UNIT_STRIPE_END 770576b1c6SShaohua Li * state) */ 780576b1c6SShaohua Li 79f6bed0efSShaohua Li struct list_head no_space_stripes; /* pending stripes, log has no space */ 80f6bed0efSShaohua Li spinlock_t no_space_stripes_lock; 81f6bed0efSShaohua Li }; 82f6bed0efSShaohua Li 83f6bed0efSShaohua Li /* 84f6bed0efSShaohua Li * an IO range starts from a meta data block and end at the next meta data 85f6bed0efSShaohua Li * block. The io unit's the meta data block tracks data/parity followed it. io 86f6bed0efSShaohua Li * unit is written to log disk with normal write, as we always flush log disk 87f6bed0efSShaohua Li * first and then start move data to raid disks, there is no requirement to 88f6bed0efSShaohua Li * write io unit with FLUSH/FUA 89f6bed0efSShaohua Li */ 90f6bed0efSShaohua Li struct r5l_io_unit { 91f6bed0efSShaohua Li struct r5l_log *log; 92f6bed0efSShaohua Li 93f6bed0efSShaohua Li struct page *meta_page; /* store meta block */ 94f6bed0efSShaohua Li int meta_offset; /* current offset in meta_page */ 95f6bed0efSShaohua Li 96f6bed0efSShaohua Li struct bio_list bios; 97f6bed0efSShaohua Li atomic_t pending_io; /* pending bios not written to log yet */ 98f6bed0efSShaohua Li struct bio *current_bio;/* current_bio accepting new data */ 99f6bed0efSShaohua Li 100f6bed0efSShaohua Li atomic_t pending_stripe;/* how many stripes not flushed to raid */ 101f6bed0efSShaohua Li u64 seq; /* seq number of the metablock */ 102f6bed0efSShaohua Li sector_t log_start; /* where the io_unit starts */ 103f6bed0efSShaohua Li sector_t log_end; /* where the io_unit ends */ 104f6bed0efSShaohua Li struct list_head log_sibling; /* log->running_ios */ 105f6bed0efSShaohua Li struct list_head stripe_list; /* stripes added to the io_unit */ 106f6bed0efSShaohua Li 107f6bed0efSShaohua Li int state; 108f6bed0efSShaohua Li wait_queue_head_t wait_state; 109f6bed0efSShaohua Li }; 110f6bed0efSShaohua Li 111f6bed0efSShaohua Li /* r5l_io_unit state */ 112f6bed0efSShaohua Li enum r5l_io_unit_state { 113f6bed0efSShaohua Li IO_UNIT_RUNNING = 0, /* accepting new IO */ 114f6bed0efSShaohua Li IO_UNIT_IO_START = 1, /* io_unit bio start writing to log, 115f6bed0efSShaohua Li * don't accepting new bio */ 116f6bed0efSShaohua Li IO_UNIT_IO_END = 2, /* io_unit bio finish writing to log */ 117f6bed0efSShaohua Li IO_UNIT_STRIPE_START = 3, /* stripes of io_unit are flushing to raid */ 118f6bed0efSShaohua Li IO_UNIT_STRIPE_END = 4, /* stripes data finished writing to raid */ 119f6bed0efSShaohua Li }; 120f6bed0efSShaohua Li 121f6bed0efSShaohua Li static sector_t r5l_ring_add(struct r5l_log *log, sector_t start, sector_t inc) 122f6bed0efSShaohua Li { 123f6bed0efSShaohua Li start += inc; 124f6bed0efSShaohua Li if (start >= log->device_size) 125f6bed0efSShaohua Li start = start - log->device_size; 126f6bed0efSShaohua Li return start; 127f6bed0efSShaohua Li } 128f6bed0efSShaohua Li 129f6bed0efSShaohua Li static sector_t r5l_ring_distance(struct r5l_log *log, sector_t start, 130f6bed0efSShaohua Li sector_t end) 131f6bed0efSShaohua Li { 132f6bed0efSShaohua Li if (end >= start) 133f6bed0efSShaohua Li return end - start; 134f6bed0efSShaohua Li else 135f6bed0efSShaohua Li return end + log->device_size - start; 136f6bed0efSShaohua Li } 137f6bed0efSShaohua Li 138f6bed0efSShaohua Li static bool r5l_has_free_space(struct r5l_log *log, sector_t size) 139f6bed0efSShaohua Li { 140f6bed0efSShaohua Li sector_t used_size; 141f6bed0efSShaohua Li 142f6bed0efSShaohua Li used_size = r5l_ring_distance(log, log->last_checkpoint, 143f6bed0efSShaohua Li log->log_start); 144f6bed0efSShaohua Li 145f6bed0efSShaohua Li return log->device_size > used_size + size; 146f6bed0efSShaohua Li } 147f6bed0efSShaohua Li 148f6bed0efSShaohua Li static struct r5l_io_unit *r5l_alloc_io_unit(struct r5l_log *log) 149f6bed0efSShaohua Li { 150f6bed0efSShaohua Li struct r5l_io_unit *io; 151f6bed0efSShaohua Li /* We can't handle memory allocate failure so far */ 152f6bed0efSShaohua Li gfp_t gfp = GFP_NOIO | __GFP_NOFAIL; 153f6bed0efSShaohua Li 154f6bed0efSShaohua Li io = kmem_cache_zalloc(log->io_kc, gfp); 155f6bed0efSShaohua Li io->log = log; 156f6bed0efSShaohua Li io->meta_page = alloc_page(gfp | __GFP_ZERO); 157f6bed0efSShaohua Li 158f6bed0efSShaohua Li bio_list_init(&io->bios); 159f6bed0efSShaohua Li INIT_LIST_HEAD(&io->log_sibling); 160f6bed0efSShaohua Li INIT_LIST_HEAD(&io->stripe_list); 161f6bed0efSShaohua Li io->state = IO_UNIT_RUNNING; 162f6bed0efSShaohua Li init_waitqueue_head(&io->wait_state); 163f6bed0efSShaohua Li return io; 164f6bed0efSShaohua Li } 165f6bed0efSShaohua Li 166f6bed0efSShaohua Li static void r5l_free_io_unit(struct r5l_log *log, struct r5l_io_unit *io) 167f6bed0efSShaohua Li { 168f6bed0efSShaohua Li __free_page(io->meta_page); 169f6bed0efSShaohua Li kmem_cache_free(log->io_kc, io); 170f6bed0efSShaohua Li } 171f6bed0efSShaohua Li 172f6bed0efSShaohua Li static void r5l_move_io_unit_list(struct list_head *from, struct list_head *to, 173f6bed0efSShaohua Li enum r5l_io_unit_state state) 174f6bed0efSShaohua Li { 175f6bed0efSShaohua Li struct r5l_io_unit *io; 176f6bed0efSShaohua Li 177f6bed0efSShaohua Li while (!list_empty(from)) { 178f6bed0efSShaohua Li io = list_first_entry(from, struct r5l_io_unit, log_sibling); 179f6bed0efSShaohua Li /* don't change list order */ 180f6bed0efSShaohua Li if (io->state >= state) 181f6bed0efSShaohua Li list_move_tail(&io->log_sibling, to); 182f6bed0efSShaohua Li else 183f6bed0efSShaohua Li break; 184f6bed0efSShaohua Li } 185f6bed0efSShaohua Li } 186f6bed0efSShaohua Li 1870576b1c6SShaohua Li /* 1880576b1c6SShaohua Li * We don't want too many io_units reside in stripe_end_ios list, which will 1890576b1c6SShaohua Li * waste a lot of memory. So we try to remove some. But we must keep at least 2 1900576b1c6SShaohua Li * io_units. The superblock must point to a valid meta, if it's the last meta, 1910576b1c6SShaohua Li * recovery can scan less 1920576b1c6SShaohua Li */ 1930576b1c6SShaohua Li static void r5l_compress_stripe_end_list(struct r5l_log *log) 1940576b1c6SShaohua Li { 1950576b1c6SShaohua Li struct r5l_io_unit *first, *last, *io; 1960576b1c6SShaohua Li 1970576b1c6SShaohua Li first = list_first_entry(&log->stripe_end_ios, 1980576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 1990576b1c6SShaohua Li last = list_last_entry(&log->stripe_end_ios, 2000576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 2010576b1c6SShaohua Li if (first == last) 2020576b1c6SShaohua Li return; 2030576b1c6SShaohua Li list_del(&first->log_sibling); 2040576b1c6SShaohua Li list_del(&last->log_sibling); 2050576b1c6SShaohua Li while (!list_empty(&log->stripe_end_ios)) { 2060576b1c6SShaohua Li io = list_first_entry(&log->stripe_end_ios, 2070576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 2080576b1c6SShaohua Li list_del(&io->log_sibling); 2090576b1c6SShaohua Li first->log_end = io->log_end; 2100576b1c6SShaohua Li r5l_free_io_unit(log, io); 2110576b1c6SShaohua Li } 2120576b1c6SShaohua Li list_add_tail(&first->log_sibling, &log->stripe_end_ios); 2130576b1c6SShaohua Li list_add_tail(&last->log_sibling, &log->stripe_end_ios); 2140576b1c6SShaohua Li } 2150576b1c6SShaohua Li 216f6bed0efSShaohua Li static void r5l_wake_reclaim(struct r5l_log *log, sector_t space); 217f6bed0efSShaohua Li static void __r5l_set_io_unit_state(struct r5l_io_unit *io, 218f6bed0efSShaohua Li enum r5l_io_unit_state state) 219f6bed0efSShaohua Li { 220f6bed0efSShaohua Li struct r5l_log *log = io->log; 221f6bed0efSShaohua Li 222f6bed0efSShaohua Li if (WARN_ON(io->state >= state)) 223f6bed0efSShaohua Li return; 224f6bed0efSShaohua Li io->state = state; 225f6bed0efSShaohua Li if (state == IO_UNIT_IO_END) 226f6bed0efSShaohua Li r5l_move_io_unit_list(&log->running_ios, &log->io_end_ios, 227f6bed0efSShaohua Li IO_UNIT_IO_END); 2280576b1c6SShaohua Li if (state == IO_UNIT_STRIPE_END) { 2290576b1c6SShaohua Li struct r5l_io_unit *last; 2300576b1c6SShaohua Li sector_t reclaimable_space; 2310576b1c6SShaohua Li 2320576b1c6SShaohua Li r5l_move_io_unit_list(&log->io_end_ios, &log->stripe_end_ios, 2330576b1c6SShaohua Li IO_UNIT_STRIPE_END); 2340576b1c6SShaohua Li 2350576b1c6SShaohua Li last = list_last_entry(&log->stripe_end_ios, 2360576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 2370576b1c6SShaohua Li reclaimable_space = r5l_ring_distance(log, log->last_checkpoint, 2380576b1c6SShaohua Li last->log_end); 2390576b1c6SShaohua Li if (reclaimable_space >= log->max_free_space) 2400576b1c6SShaohua Li r5l_wake_reclaim(log, 0); 2410576b1c6SShaohua Li 2420576b1c6SShaohua Li r5l_compress_stripe_end_list(log); 2430576b1c6SShaohua Li } 244f6bed0efSShaohua Li wake_up(&io->wait_state); 245f6bed0efSShaohua Li } 246f6bed0efSShaohua Li 247f6bed0efSShaohua Li static void r5l_set_io_unit_state(struct r5l_io_unit *io, 248f6bed0efSShaohua Li enum r5l_io_unit_state state) 249f6bed0efSShaohua Li { 250f6bed0efSShaohua Li struct r5l_log *log = io->log; 251f6bed0efSShaohua Li unsigned long flags; 252f6bed0efSShaohua Li 253f6bed0efSShaohua Li spin_lock_irqsave(&log->io_list_lock, flags); 254f6bed0efSShaohua Li __r5l_set_io_unit_state(io, state); 255f6bed0efSShaohua Li spin_unlock_irqrestore(&log->io_list_lock, flags); 256f6bed0efSShaohua Li } 257f6bed0efSShaohua Li 258f6bed0efSShaohua Li /* XXX: totally ignores I/O errors */ 259f6bed0efSShaohua Li static void r5l_log_endio(struct bio *bio) 260f6bed0efSShaohua Li { 261f6bed0efSShaohua Li struct r5l_io_unit *io = bio->bi_private; 262f6bed0efSShaohua Li struct r5l_log *log = io->log; 263f6bed0efSShaohua Li 264f6bed0efSShaohua Li bio_put(bio); 265f6bed0efSShaohua Li 266f6bed0efSShaohua Li if (!atomic_dec_and_test(&io->pending_io)) 267f6bed0efSShaohua Li return; 268f6bed0efSShaohua Li 269f6bed0efSShaohua Li r5l_set_io_unit_state(io, IO_UNIT_IO_END); 270f6bed0efSShaohua Li md_wakeup_thread(log->rdev->mddev->thread); 271f6bed0efSShaohua Li } 272f6bed0efSShaohua Li 273f6bed0efSShaohua Li static void r5l_submit_current_io(struct r5l_log *log) 274f6bed0efSShaohua Li { 275f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 276f6bed0efSShaohua Li struct r5l_meta_block *block; 277f6bed0efSShaohua Li struct bio *bio; 278f6bed0efSShaohua Li u32 crc; 279f6bed0efSShaohua Li 280f6bed0efSShaohua Li if (!io) 281f6bed0efSShaohua Li return; 282f6bed0efSShaohua Li 283f6bed0efSShaohua Li block = page_address(io->meta_page); 284f6bed0efSShaohua Li block->meta_size = cpu_to_le32(io->meta_offset); 285*5cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, block, PAGE_SIZE); 286f6bed0efSShaohua Li block->checksum = cpu_to_le32(crc); 287f6bed0efSShaohua Li 288f6bed0efSShaohua Li log->current_io = NULL; 289f6bed0efSShaohua Li r5l_set_io_unit_state(io, IO_UNIT_IO_START); 290f6bed0efSShaohua Li 291f6bed0efSShaohua Li while ((bio = bio_list_pop(&io->bios))) { 292f6bed0efSShaohua Li /* all IO must start from rdev->data_offset */ 293f6bed0efSShaohua Li bio->bi_iter.bi_sector += log->rdev->data_offset; 294f6bed0efSShaohua Li submit_bio(WRITE, bio); 295f6bed0efSShaohua Li } 296f6bed0efSShaohua Li } 297f6bed0efSShaohua Li 298f6bed0efSShaohua Li static struct r5l_io_unit *r5l_new_meta(struct r5l_log *log) 299f6bed0efSShaohua Li { 300f6bed0efSShaohua Li struct r5l_io_unit *io; 301f6bed0efSShaohua Li struct r5l_meta_block *block; 302f6bed0efSShaohua Li struct bio *bio; 303f6bed0efSShaohua Li 304f6bed0efSShaohua Li io = r5l_alloc_io_unit(log); 305f6bed0efSShaohua Li 306f6bed0efSShaohua Li block = page_address(io->meta_page); 307f6bed0efSShaohua Li block->magic = cpu_to_le32(R5LOG_MAGIC); 308f6bed0efSShaohua Li block->version = R5LOG_VERSION; 309f6bed0efSShaohua Li block->seq = cpu_to_le64(log->seq); 310f6bed0efSShaohua Li block->position = cpu_to_le64(log->log_start); 311f6bed0efSShaohua Li 312f6bed0efSShaohua Li io->log_start = log->log_start; 313f6bed0efSShaohua Li io->meta_offset = sizeof(struct r5l_meta_block); 314f6bed0efSShaohua Li io->seq = log->seq; 315f6bed0efSShaohua Li 316f6bed0efSShaohua Li bio = bio_kmalloc(GFP_NOIO | __GFP_NOFAIL, BIO_MAX_PAGES); 317f6bed0efSShaohua Li io->current_bio = bio; 318f6bed0efSShaohua Li bio->bi_rw = WRITE; 319f6bed0efSShaohua Li bio->bi_bdev = log->rdev->bdev; 320f6bed0efSShaohua Li bio->bi_iter.bi_sector = log->log_start; 321f6bed0efSShaohua Li bio_add_page(bio, io->meta_page, PAGE_SIZE, 0); 322f6bed0efSShaohua Li bio->bi_end_io = r5l_log_endio; 323f6bed0efSShaohua Li bio->bi_private = io; 324f6bed0efSShaohua Li 325f6bed0efSShaohua Li bio_list_add(&io->bios, bio); 326f6bed0efSShaohua Li atomic_inc(&io->pending_io); 327f6bed0efSShaohua Li 328f6bed0efSShaohua Li log->seq++; 329f6bed0efSShaohua Li log->log_start = r5l_ring_add(log, log->log_start, BLOCK_SECTORS); 330f6bed0efSShaohua Li io->log_end = log->log_start; 331f6bed0efSShaohua Li /* current bio hit disk end */ 332f6bed0efSShaohua Li if (log->log_start == 0) 333f6bed0efSShaohua Li io->current_bio = NULL; 334f6bed0efSShaohua Li 335f6bed0efSShaohua Li spin_lock_irq(&log->io_list_lock); 336f6bed0efSShaohua Li list_add_tail(&io->log_sibling, &log->running_ios); 337f6bed0efSShaohua Li spin_unlock_irq(&log->io_list_lock); 338f6bed0efSShaohua Li 339f6bed0efSShaohua Li return io; 340f6bed0efSShaohua Li } 341f6bed0efSShaohua Li 342f6bed0efSShaohua Li static int r5l_get_meta(struct r5l_log *log, unsigned int payload_size) 343f6bed0efSShaohua Li { 344f6bed0efSShaohua Li struct r5l_io_unit *io; 345f6bed0efSShaohua Li 346f6bed0efSShaohua Li io = log->current_io; 347f6bed0efSShaohua Li if (io && io->meta_offset + payload_size > PAGE_SIZE) 348f6bed0efSShaohua Li r5l_submit_current_io(log); 349f6bed0efSShaohua Li io = log->current_io; 350f6bed0efSShaohua Li if (io) 351f6bed0efSShaohua Li return 0; 352f6bed0efSShaohua Li 353f6bed0efSShaohua Li log->current_io = r5l_new_meta(log); 354f6bed0efSShaohua Li return 0; 355f6bed0efSShaohua Li } 356f6bed0efSShaohua Li 357f6bed0efSShaohua Li static void r5l_append_payload_meta(struct r5l_log *log, u16 type, 358f6bed0efSShaohua Li sector_t location, 359f6bed0efSShaohua Li u32 checksum1, u32 checksum2, 360f6bed0efSShaohua Li bool checksum2_valid) 361f6bed0efSShaohua Li { 362f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 363f6bed0efSShaohua Li struct r5l_payload_data_parity *payload; 364f6bed0efSShaohua Li 365f6bed0efSShaohua Li payload = page_address(io->meta_page) + io->meta_offset; 366f6bed0efSShaohua Li payload->header.type = cpu_to_le16(type); 367f6bed0efSShaohua Li payload->header.flags = cpu_to_le16(0); 368f6bed0efSShaohua Li payload->size = cpu_to_le32((1 + !!checksum2_valid) << 369f6bed0efSShaohua Li (PAGE_SHIFT - 9)); 370f6bed0efSShaohua Li payload->location = cpu_to_le64(location); 371f6bed0efSShaohua Li payload->checksum[0] = cpu_to_le32(checksum1); 372f6bed0efSShaohua Li if (checksum2_valid) 373f6bed0efSShaohua Li payload->checksum[1] = cpu_to_le32(checksum2); 374f6bed0efSShaohua Li 375f6bed0efSShaohua Li io->meta_offset += sizeof(struct r5l_payload_data_parity) + 376f6bed0efSShaohua Li sizeof(__le32) * (1 + !!checksum2_valid); 377f6bed0efSShaohua Li } 378f6bed0efSShaohua Li 379f6bed0efSShaohua Li static void r5l_append_payload_page(struct r5l_log *log, struct page *page) 380f6bed0efSShaohua Li { 381f6bed0efSShaohua Li struct r5l_io_unit *io = log->current_io; 382f6bed0efSShaohua Li 383f6bed0efSShaohua Li alloc_bio: 384f6bed0efSShaohua Li if (!io->current_bio) { 385f6bed0efSShaohua Li struct bio *bio; 386f6bed0efSShaohua Li 387f6bed0efSShaohua Li bio = bio_kmalloc(GFP_NOIO | __GFP_NOFAIL, BIO_MAX_PAGES); 388f6bed0efSShaohua Li bio->bi_rw = WRITE; 389f6bed0efSShaohua Li bio->bi_bdev = log->rdev->bdev; 390f6bed0efSShaohua Li bio->bi_iter.bi_sector = log->log_start; 391f6bed0efSShaohua Li bio->bi_end_io = r5l_log_endio; 392f6bed0efSShaohua Li bio->bi_private = io; 393f6bed0efSShaohua Li bio_list_add(&io->bios, bio); 394f6bed0efSShaohua Li atomic_inc(&io->pending_io); 395f6bed0efSShaohua Li io->current_bio = bio; 396f6bed0efSShaohua Li } 397f6bed0efSShaohua Li if (!bio_add_page(io->current_bio, page, PAGE_SIZE, 0)) { 398f6bed0efSShaohua Li io->current_bio = NULL; 399f6bed0efSShaohua Li goto alloc_bio; 400f6bed0efSShaohua Li } 401f6bed0efSShaohua Li log->log_start = r5l_ring_add(log, log->log_start, 402f6bed0efSShaohua Li BLOCK_SECTORS); 403f6bed0efSShaohua Li /* current bio hit disk end */ 404f6bed0efSShaohua Li if (log->log_start == 0) 405f6bed0efSShaohua Li io->current_bio = NULL; 406f6bed0efSShaohua Li 407f6bed0efSShaohua Li io->log_end = log->log_start; 408f6bed0efSShaohua Li } 409f6bed0efSShaohua Li 410f6bed0efSShaohua Li static void r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, 411f6bed0efSShaohua Li int data_pages, int parity_pages) 412f6bed0efSShaohua Li { 413f6bed0efSShaohua Li int i; 414f6bed0efSShaohua Li int meta_size; 415f6bed0efSShaohua Li struct r5l_io_unit *io; 416f6bed0efSShaohua Li 417f6bed0efSShaohua Li meta_size = 418f6bed0efSShaohua Li ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) 419f6bed0efSShaohua Li * data_pages) + 420f6bed0efSShaohua Li sizeof(struct r5l_payload_data_parity) + 421f6bed0efSShaohua Li sizeof(__le32) * parity_pages; 422f6bed0efSShaohua Li 423f6bed0efSShaohua Li r5l_get_meta(log, meta_size); 424f6bed0efSShaohua Li io = log->current_io; 425f6bed0efSShaohua Li 426f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 427f6bed0efSShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) 428f6bed0efSShaohua Li continue; 429f6bed0efSShaohua Li if (i == sh->pd_idx || i == sh->qd_idx) 430f6bed0efSShaohua Li continue; 431f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_DATA, 432f6bed0efSShaohua Li raid5_compute_blocknr(sh, i, 0), 433f6bed0efSShaohua Li sh->dev[i].log_checksum, 0, false); 434f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[i].page); 435f6bed0efSShaohua Li } 436f6bed0efSShaohua Li 437f6bed0efSShaohua Li if (sh->qd_idx >= 0) { 438f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 439f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 440f6bed0efSShaohua Li sh->dev[sh->qd_idx].log_checksum, true); 441f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 442f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->qd_idx].page); 443f6bed0efSShaohua Li } else { 444f6bed0efSShaohua Li r5l_append_payload_meta(log, R5LOG_PAYLOAD_PARITY, 445f6bed0efSShaohua Li sh->sector, sh->dev[sh->pd_idx].log_checksum, 446f6bed0efSShaohua Li 0, false); 447f6bed0efSShaohua Li r5l_append_payload_page(log, sh->dev[sh->pd_idx].page); 448f6bed0efSShaohua Li } 449f6bed0efSShaohua Li 450f6bed0efSShaohua Li list_add_tail(&sh->log_list, &io->stripe_list); 451f6bed0efSShaohua Li atomic_inc(&io->pending_stripe); 452f6bed0efSShaohua Li sh->log_io = io; 453f6bed0efSShaohua Li } 454f6bed0efSShaohua Li 455f6bed0efSShaohua Li /* 456f6bed0efSShaohua Li * running in raid5d, where reclaim could wait for raid5d too (when it flushes 457f6bed0efSShaohua Li * data from log to raid disks), so we shouldn't wait for reclaim here 458f6bed0efSShaohua Li */ 459f6bed0efSShaohua Li int r5l_write_stripe(struct r5l_log *log, struct stripe_head *sh) 460f6bed0efSShaohua Li { 461f6bed0efSShaohua Li int write_disks = 0; 462f6bed0efSShaohua Li int data_pages, parity_pages; 463f6bed0efSShaohua Li int meta_size; 464f6bed0efSShaohua Li int reserve; 465f6bed0efSShaohua Li int i; 466f6bed0efSShaohua Li 467f6bed0efSShaohua Li if (!log) 468f6bed0efSShaohua Li return -EAGAIN; 469f6bed0efSShaohua Li /* Don't support stripe batch */ 470f6bed0efSShaohua Li if (sh->log_io || !test_bit(R5_Wantwrite, &sh->dev[sh->pd_idx].flags) || 471f6bed0efSShaohua Li test_bit(STRIPE_SYNCING, &sh->state)) { 472f6bed0efSShaohua Li /* the stripe is written to log, we start writing it to raid */ 473f6bed0efSShaohua Li clear_bit(STRIPE_LOG_TRAPPED, &sh->state); 474f6bed0efSShaohua Li return -EAGAIN; 475f6bed0efSShaohua Li } 476f6bed0efSShaohua Li 477f6bed0efSShaohua Li for (i = 0; i < sh->disks; i++) { 478f6bed0efSShaohua Li void *addr; 479f6bed0efSShaohua Li 480f6bed0efSShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[i].flags)) 481f6bed0efSShaohua Li continue; 482f6bed0efSShaohua Li write_disks++; 483f6bed0efSShaohua Li /* checksum is already calculated in last run */ 484f6bed0efSShaohua Li if (test_bit(STRIPE_LOG_TRAPPED, &sh->state)) 485f6bed0efSShaohua Li continue; 486f6bed0efSShaohua Li addr = kmap_atomic(sh->dev[i].page); 487*5cb2fbd6SShaohua Li sh->dev[i].log_checksum = crc32c_le(log->uuid_checksum, 488f6bed0efSShaohua Li addr, PAGE_SIZE); 489f6bed0efSShaohua Li kunmap_atomic(addr); 490f6bed0efSShaohua Li } 491f6bed0efSShaohua Li parity_pages = 1 + !!(sh->qd_idx >= 0); 492f6bed0efSShaohua Li data_pages = write_disks - parity_pages; 493f6bed0efSShaohua Li 494f6bed0efSShaohua Li meta_size = 495f6bed0efSShaohua Li ((sizeof(struct r5l_payload_data_parity) + sizeof(__le32)) 496f6bed0efSShaohua Li * data_pages) + 497f6bed0efSShaohua Li sizeof(struct r5l_payload_data_parity) + 498f6bed0efSShaohua Li sizeof(__le32) * parity_pages; 499f6bed0efSShaohua Li /* Doesn't work with very big raid array */ 500f6bed0efSShaohua Li if (meta_size + sizeof(struct r5l_meta_block) > PAGE_SIZE) 501f6bed0efSShaohua Li return -EINVAL; 502f6bed0efSShaohua Li 503f6bed0efSShaohua Li set_bit(STRIPE_LOG_TRAPPED, &sh->state); 504f6bed0efSShaohua Li atomic_inc(&sh->count); 505f6bed0efSShaohua Li 506f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 507f6bed0efSShaohua Li /* meta + data */ 508f6bed0efSShaohua Li reserve = (1 + write_disks) << (PAGE_SHIFT - 9); 509f6bed0efSShaohua Li if (r5l_has_free_space(log, reserve)) 510f6bed0efSShaohua Li r5l_log_stripe(log, sh, data_pages, parity_pages); 511f6bed0efSShaohua Li else { 512f6bed0efSShaohua Li spin_lock(&log->no_space_stripes_lock); 513f6bed0efSShaohua Li list_add_tail(&sh->log_list, &log->no_space_stripes); 514f6bed0efSShaohua Li spin_unlock(&log->no_space_stripes_lock); 515f6bed0efSShaohua Li 516f6bed0efSShaohua Li r5l_wake_reclaim(log, reserve); 517f6bed0efSShaohua Li } 518f6bed0efSShaohua Li mutex_unlock(&log->io_mutex); 519f6bed0efSShaohua Li 520f6bed0efSShaohua Li return 0; 521f6bed0efSShaohua Li } 522f6bed0efSShaohua Li 523f6bed0efSShaohua Li void r5l_write_stripe_run(struct r5l_log *log) 524f6bed0efSShaohua Li { 525f6bed0efSShaohua Li if (!log) 526f6bed0efSShaohua Li return; 527f6bed0efSShaohua Li mutex_lock(&log->io_mutex); 528f6bed0efSShaohua Li r5l_submit_current_io(log); 529f6bed0efSShaohua Li mutex_unlock(&log->io_mutex); 530f6bed0efSShaohua Li } 531f6bed0efSShaohua Li 532f6bed0efSShaohua Li /* This will run after log space is reclaimed */ 533f6bed0efSShaohua Li static void r5l_run_no_space_stripes(struct r5l_log *log) 534f6bed0efSShaohua Li { 535f6bed0efSShaohua Li struct stripe_head *sh; 536f6bed0efSShaohua Li 537f6bed0efSShaohua Li spin_lock(&log->no_space_stripes_lock); 538f6bed0efSShaohua Li while (!list_empty(&log->no_space_stripes)) { 539f6bed0efSShaohua Li sh = list_first_entry(&log->no_space_stripes, 540f6bed0efSShaohua Li struct stripe_head, log_list); 541f6bed0efSShaohua Li list_del_init(&sh->log_list); 542f6bed0efSShaohua Li set_bit(STRIPE_HANDLE, &sh->state); 543f6bed0efSShaohua Li raid5_release_stripe(sh); 544f6bed0efSShaohua Li } 545f6bed0efSShaohua Li spin_unlock(&log->no_space_stripes_lock); 546f6bed0efSShaohua Li } 547f6bed0efSShaohua Li 5480576b1c6SShaohua Li void r5l_stripe_write_finished(struct stripe_head *sh) 5490576b1c6SShaohua Li { 5500576b1c6SShaohua Li struct r5l_io_unit *io; 5510576b1c6SShaohua Li 5520576b1c6SShaohua Li /* Don't support stripe batch */ 5530576b1c6SShaohua Li io = sh->log_io; 5540576b1c6SShaohua Li if (!io) 5550576b1c6SShaohua Li return; 5560576b1c6SShaohua Li sh->log_io = NULL; 5570576b1c6SShaohua Li 5580576b1c6SShaohua Li if (atomic_dec_and_test(&io->pending_stripe)) 5590576b1c6SShaohua Li r5l_set_io_unit_state(io, IO_UNIT_STRIPE_END); 5600576b1c6SShaohua Li } 5610576b1c6SShaohua Li 5620576b1c6SShaohua Li /* 5630576b1c6SShaohua Li * Starting dispatch IO to raid. 5640576b1c6SShaohua Li * io_unit(meta) consists of a log. There is one situation we want to avoid. A 5650576b1c6SShaohua Li * broken meta in the middle of a log causes recovery can't find meta at the 5660576b1c6SShaohua Li * head of log. If operations require meta at the head persistent in log, we 5670576b1c6SShaohua Li * must make sure meta before it persistent in log too. A case is: 5680576b1c6SShaohua Li * 5690576b1c6SShaohua Li * stripe data/parity is in log, we start write stripe to raid disks. stripe 5700576b1c6SShaohua Li * data/parity must be persistent in log before we do the write to raid disks. 5710576b1c6SShaohua Li * 5720576b1c6SShaohua Li * The solution is we restrictly maintain io_unit list order. In this case, we 5730576b1c6SShaohua Li * only write stripes of an io_unit to raid disks till the io_unit is the first 5740576b1c6SShaohua Li * one whose data/parity is in log. 5750576b1c6SShaohua Li */ 5760576b1c6SShaohua Li void r5l_flush_stripe_to_raid(struct r5l_log *log) 5770576b1c6SShaohua Li { 5780576b1c6SShaohua Li struct r5l_io_unit *io; 5790576b1c6SShaohua Li struct stripe_head *sh; 5800576b1c6SShaohua Li bool run_stripe; 5810576b1c6SShaohua Li 5820576b1c6SShaohua Li if (!log) 5830576b1c6SShaohua Li return; 5840576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 5850576b1c6SShaohua Li run_stripe = !list_empty(&log->io_end_ios); 5860576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 5870576b1c6SShaohua Li 5880576b1c6SShaohua Li if (!run_stripe) 5890576b1c6SShaohua Li return; 5900576b1c6SShaohua Li 5910576b1c6SShaohua Li blkdev_issue_flush(log->rdev->bdev, GFP_NOIO, NULL); 5920576b1c6SShaohua Li 5930576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 5940576b1c6SShaohua Li list_for_each_entry(io, &log->io_end_ios, log_sibling) { 5950576b1c6SShaohua Li if (io->state >= IO_UNIT_STRIPE_START) 5960576b1c6SShaohua Li continue; 5970576b1c6SShaohua Li __r5l_set_io_unit_state(io, IO_UNIT_STRIPE_START); 5980576b1c6SShaohua Li 5990576b1c6SShaohua Li while (!list_empty(&io->stripe_list)) { 6000576b1c6SShaohua Li sh = list_first_entry(&io->stripe_list, 6010576b1c6SShaohua Li struct stripe_head, log_list); 6020576b1c6SShaohua Li list_del_init(&sh->log_list); 6030576b1c6SShaohua Li set_bit(STRIPE_HANDLE, &sh->state); 6040576b1c6SShaohua Li raid5_release_stripe(sh); 6050576b1c6SShaohua Li } 6060576b1c6SShaohua Li } 6070576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 6080576b1c6SShaohua Li } 6090576b1c6SShaohua Li 6100576b1c6SShaohua Li static void r5l_kick_io_unit(struct r5l_log *log, struct r5l_io_unit *io) 6110576b1c6SShaohua Li { 6120576b1c6SShaohua Li /* the log thread will write the io unit */ 6130576b1c6SShaohua Li wait_event(io->wait_state, io->state >= IO_UNIT_IO_END); 6140576b1c6SShaohua Li if (io->state < IO_UNIT_STRIPE_START) 6150576b1c6SShaohua Li r5l_flush_stripe_to_raid(log); 6160576b1c6SShaohua Li wait_event(io->wait_state, io->state >= IO_UNIT_STRIPE_END); 6170576b1c6SShaohua Li } 6180576b1c6SShaohua Li 6190576b1c6SShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp); 6200576b1c6SShaohua Li static void r5l_do_reclaim(struct r5l_log *log) 6210576b1c6SShaohua Li { 6220576b1c6SShaohua Li struct r5l_io_unit *io, *last; 6230576b1c6SShaohua Li LIST_HEAD(list); 6240576b1c6SShaohua Li sector_t free = 0; 6250576b1c6SShaohua Li sector_t reclaim_target = xchg(&log->reclaim_target, 0); 6260576b1c6SShaohua Li 6270576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 6280576b1c6SShaohua Li /* 6290576b1c6SShaohua Li * move proper io_unit to reclaim list. We should not change the order. 6300576b1c6SShaohua Li * reclaimable/unreclaimable io_unit can be mixed in the list, we 6310576b1c6SShaohua Li * shouldn't reuse space of an unreclaimable io_unit 6320576b1c6SShaohua Li */ 6330576b1c6SShaohua Li while (1) { 6340576b1c6SShaohua Li while (!list_empty(&log->stripe_end_ios)) { 6350576b1c6SShaohua Li io = list_first_entry(&log->stripe_end_ios, 6360576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 6370576b1c6SShaohua Li list_move_tail(&io->log_sibling, &list); 6380576b1c6SShaohua Li free += r5l_ring_distance(log, io->log_start, 6390576b1c6SShaohua Li io->log_end); 6400576b1c6SShaohua Li } 6410576b1c6SShaohua Li 6420576b1c6SShaohua Li if (free >= reclaim_target || 6430576b1c6SShaohua Li (list_empty(&log->running_ios) && 6440576b1c6SShaohua Li list_empty(&log->io_end_ios) && 6450576b1c6SShaohua Li list_empty(&log->stripe_end_ios))) 6460576b1c6SShaohua Li break; 6470576b1c6SShaohua Li 6480576b1c6SShaohua Li /* Below waiting mostly happens when we shutdown the raid */ 6490576b1c6SShaohua Li if (!list_empty(&log->io_end_ios)) { 6500576b1c6SShaohua Li io = list_first_entry(&log->io_end_ios, 6510576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 6520576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 6530576b1c6SShaohua Li /* nobody else can delete the io, we are safe */ 6540576b1c6SShaohua Li r5l_kick_io_unit(log, io); 6550576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 6560576b1c6SShaohua Li continue; 6570576b1c6SShaohua Li } 6580576b1c6SShaohua Li 6590576b1c6SShaohua Li if (!list_empty(&log->running_ios)) { 6600576b1c6SShaohua Li io = list_first_entry(&log->running_ios, 6610576b1c6SShaohua Li struct r5l_io_unit, log_sibling); 6620576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 6630576b1c6SShaohua Li /* nobody else can delete the io, we are safe */ 6640576b1c6SShaohua Li r5l_kick_io_unit(log, io); 6650576b1c6SShaohua Li spin_lock_irq(&log->io_list_lock); 6660576b1c6SShaohua Li continue; 6670576b1c6SShaohua Li } 6680576b1c6SShaohua Li } 6690576b1c6SShaohua Li spin_unlock_irq(&log->io_list_lock); 6700576b1c6SShaohua Li 6710576b1c6SShaohua Li if (list_empty(&list)) 6720576b1c6SShaohua Li return; 6730576b1c6SShaohua Li 6740576b1c6SShaohua Li /* super always point to last valid meta */ 6750576b1c6SShaohua Li last = list_last_entry(&list, struct r5l_io_unit, log_sibling); 6760576b1c6SShaohua Li /* 6770576b1c6SShaohua Li * write_super will flush cache of each raid disk. We must write super 6780576b1c6SShaohua Li * here, because the log area might be reused soon and we don't want to 6790576b1c6SShaohua Li * confuse recovery 6800576b1c6SShaohua Li */ 6810576b1c6SShaohua Li r5l_write_super(log, last->log_start); 6820576b1c6SShaohua Li 6830576b1c6SShaohua Li mutex_lock(&log->io_mutex); 6840576b1c6SShaohua Li log->last_checkpoint = last->log_start; 6850576b1c6SShaohua Li log->last_cp_seq = last->seq; 6860576b1c6SShaohua Li mutex_unlock(&log->io_mutex); 6870576b1c6SShaohua Li r5l_run_no_space_stripes(log); 6880576b1c6SShaohua Li 6890576b1c6SShaohua Li while (!list_empty(&list)) { 6900576b1c6SShaohua Li io = list_first_entry(&list, struct r5l_io_unit, log_sibling); 6910576b1c6SShaohua Li list_del(&io->log_sibling); 6920576b1c6SShaohua Li r5l_free_io_unit(log, io); 6930576b1c6SShaohua Li } 6940576b1c6SShaohua Li } 6950576b1c6SShaohua Li 6960576b1c6SShaohua Li static void r5l_reclaim_thread(struct md_thread *thread) 6970576b1c6SShaohua Li { 6980576b1c6SShaohua Li struct mddev *mddev = thread->mddev; 6990576b1c6SShaohua Li struct r5conf *conf = mddev->private; 7000576b1c6SShaohua Li struct r5l_log *log = conf->log; 7010576b1c6SShaohua Li 7020576b1c6SShaohua Li if (!log) 7030576b1c6SShaohua Li return; 7040576b1c6SShaohua Li r5l_do_reclaim(log); 7050576b1c6SShaohua Li } 7060576b1c6SShaohua Li 707f6bed0efSShaohua Li static void r5l_wake_reclaim(struct r5l_log *log, sector_t space) 708f6bed0efSShaohua Li { 7090576b1c6SShaohua Li unsigned long target; 7100576b1c6SShaohua Li unsigned long new = (unsigned long)space; /* overflow in theory */ 7110576b1c6SShaohua Li 7120576b1c6SShaohua Li do { 7130576b1c6SShaohua Li target = log->reclaim_target; 7140576b1c6SShaohua Li if (new < target) 7150576b1c6SShaohua Li return; 7160576b1c6SShaohua Li } while (cmpxchg(&log->reclaim_target, target, new) != target); 7170576b1c6SShaohua Li md_wakeup_thread(log->reclaim_thread); 718f6bed0efSShaohua Li } 719f6bed0efSShaohua Li 720355810d1SShaohua Li struct r5l_recovery_ctx { 721355810d1SShaohua Li struct page *meta_page; /* current meta */ 722355810d1SShaohua Li sector_t meta_total_blocks; /* total size of current meta and data */ 723355810d1SShaohua Li sector_t pos; /* recovery position */ 724355810d1SShaohua Li u64 seq; /* recovery position seq */ 725355810d1SShaohua Li }; 726355810d1SShaohua Li 727355810d1SShaohua Li static int r5l_read_meta_block(struct r5l_log *log, 728355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 729355810d1SShaohua Li { 730355810d1SShaohua Li struct page *page = ctx->meta_page; 731355810d1SShaohua Li struct r5l_meta_block *mb; 732355810d1SShaohua Li u32 crc, stored_crc; 733355810d1SShaohua Li 734355810d1SShaohua Li if (!sync_page_io(log->rdev, ctx->pos, PAGE_SIZE, page, READ, false)) 735355810d1SShaohua Li return -EIO; 736355810d1SShaohua Li 737355810d1SShaohua Li mb = page_address(page); 738355810d1SShaohua Li stored_crc = le32_to_cpu(mb->checksum); 739355810d1SShaohua Li mb->checksum = 0; 740355810d1SShaohua Li 741355810d1SShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 742355810d1SShaohua Li le64_to_cpu(mb->seq) != ctx->seq || 743355810d1SShaohua Li mb->version != R5LOG_VERSION || 744355810d1SShaohua Li le64_to_cpu(mb->position) != ctx->pos) 745355810d1SShaohua Li return -EINVAL; 746355810d1SShaohua Li 747*5cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 748355810d1SShaohua Li if (stored_crc != crc) 749355810d1SShaohua Li return -EINVAL; 750355810d1SShaohua Li 751355810d1SShaohua Li if (le32_to_cpu(mb->meta_size) > PAGE_SIZE) 752355810d1SShaohua Li return -EINVAL; 753355810d1SShaohua Li 754355810d1SShaohua Li ctx->meta_total_blocks = BLOCK_SECTORS; 755355810d1SShaohua Li 756355810d1SShaohua Li return 0; 757355810d1SShaohua Li } 758355810d1SShaohua Li 759355810d1SShaohua Li static int r5l_recovery_flush_one_stripe(struct r5l_log *log, 760355810d1SShaohua Li struct r5l_recovery_ctx *ctx, 761355810d1SShaohua Li sector_t stripe_sect, 762355810d1SShaohua Li int *offset, sector_t *log_offset) 763355810d1SShaohua Li { 764355810d1SShaohua Li struct r5conf *conf = log->rdev->mddev->private; 765355810d1SShaohua Li struct stripe_head *sh; 766355810d1SShaohua Li struct r5l_payload_data_parity *payload; 767355810d1SShaohua Li int disk_index; 768355810d1SShaohua Li 769355810d1SShaohua Li sh = raid5_get_active_stripe(conf, stripe_sect, 0, 0, 0); 770355810d1SShaohua Li while (1) { 771355810d1SShaohua Li payload = page_address(ctx->meta_page) + *offset; 772355810d1SShaohua Li 773355810d1SShaohua Li if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_DATA) { 774355810d1SShaohua Li raid5_compute_sector(conf, 775355810d1SShaohua Li le64_to_cpu(payload->location), 0, 776355810d1SShaohua Li &disk_index, sh); 777355810d1SShaohua Li 778355810d1SShaohua Li sync_page_io(log->rdev, *log_offset, PAGE_SIZE, 779355810d1SShaohua Li sh->dev[disk_index].page, READ, false); 780355810d1SShaohua Li sh->dev[disk_index].log_checksum = 781355810d1SShaohua Li le32_to_cpu(payload->checksum[0]); 782355810d1SShaohua Li set_bit(R5_Wantwrite, &sh->dev[disk_index].flags); 783355810d1SShaohua Li ctx->meta_total_blocks += BLOCK_SECTORS; 784355810d1SShaohua Li } else { 785355810d1SShaohua Li disk_index = sh->pd_idx; 786355810d1SShaohua Li sync_page_io(log->rdev, *log_offset, PAGE_SIZE, 787355810d1SShaohua Li sh->dev[disk_index].page, READ, false); 788355810d1SShaohua Li sh->dev[disk_index].log_checksum = 789355810d1SShaohua Li le32_to_cpu(payload->checksum[0]); 790355810d1SShaohua Li set_bit(R5_Wantwrite, &sh->dev[disk_index].flags); 791355810d1SShaohua Li 792355810d1SShaohua Li if (sh->qd_idx >= 0) { 793355810d1SShaohua Li disk_index = sh->qd_idx; 794355810d1SShaohua Li sync_page_io(log->rdev, 795355810d1SShaohua Li r5l_ring_add(log, *log_offset, BLOCK_SECTORS), 796355810d1SShaohua Li PAGE_SIZE, sh->dev[disk_index].page, 797355810d1SShaohua Li READ, false); 798355810d1SShaohua Li sh->dev[disk_index].log_checksum = 799355810d1SShaohua Li le32_to_cpu(payload->checksum[1]); 800355810d1SShaohua Li set_bit(R5_Wantwrite, 801355810d1SShaohua Li &sh->dev[disk_index].flags); 802355810d1SShaohua Li } 803355810d1SShaohua Li ctx->meta_total_blocks += BLOCK_SECTORS * conf->max_degraded; 804355810d1SShaohua Li } 805355810d1SShaohua Li 806355810d1SShaohua Li *log_offset = r5l_ring_add(log, *log_offset, 807355810d1SShaohua Li le32_to_cpu(payload->size)); 808355810d1SShaohua Li *offset += sizeof(struct r5l_payload_data_parity) + 809355810d1SShaohua Li sizeof(__le32) * 810355810d1SShaohua Li (le32_to_cpu(payload->size) >> (PAGE_SHIFT - 9)); 811355810d1SShaohua Li if (le16_to_cpu(payload->header.type) == R5LOG_PAYLOAD_PARITY) 812355810d1SShaohua Li break; 813355810d1SShaohua Li } 814355810d1SShaohua Li 815355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) { 816355810d1SShaohua Li void *addr; 817355810d1SShaohua Li u32 checksum; 818355810d1SShaohua Li 819355810d1SShaohua Li if (!test_bit(R5_Wantwrite, &sh->dev[disk_index].flags)) 820355810d1SShaohua Li continue; 821355810d1SShaohua Li addr = kmap_atomic(sh->dev[disk_index].page); 822*5cb2fbd6SShaohua Li checksum = crc32c_le(log->uuid_checksum, addr, PAGE_SIZE); 823355810d1SShaohua Li kunmap_atomic(addr); 824355810d1SShaohua Li if (checksum != sh->dev[disk_index].log_checksum) 825355810d1SShaohua Li goto error; 826355810d1SShaohua Li } 827355810d1SShaohua Li 828355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) { 829355810d1SShaohua Li struct md_rdev *rdev, *rrdev; 830355810d1SShaohua Li 831355810d1SShaohua Li if (!test_and_clear_bit(R5_Wantwrite, 832355810d1SShaohua Li &sh->dev[disk_index].flags)) 833355810d1SShaohua Li continue; 834355810d1SShaohua Li 835355810d1SShaohua Li /* in case device is broken */ 836355810d1SShaohua Li rdev = rcu_dereference(conf->disks[disk_index].rdev); 837355810d1SShaohua Li if (rdev) 838355810d1SShaohua Li sync_page_io(rdev, stripe_sect, PAGE_SIZE, 839355810d1SShaohua Li sh->dev[disk_index].page, WRITE, false); 840355810d1SShaohua Li rrdev = rcu_dereference(conf->disks[disk_index].replacement); 841355810d1SShaohua Li if (rrdev) 842355810d1SShaohua Li sync_page_io(rrdev, stripe_sect, PAGE_SIZE, 843355810d1SShaohua Li sh->dev[disk_index].page, WRITE, false); 844355810d1SShaohua Li } 845355810d1SShaohua Li raid5_release_stripe(sh); 846355810d1SShaohua Li return 0; 847355810d1SShaohua Li 848355810d1SShaohua Li error: 849355810d1SShaohua Li for (disk_index = 0; disk_index < sh->disks; disk_index++) 850355810d1SShaohua Li sh->dev[disk_index].flags = 0; 851355810d1SShaohua Li raid5_release_stripe(sh); 852355810d1SShaohua Li return -EINVAL; 853355810d1SShaohua Li } 854355810d1SShaohua Li 855355810d1SShaohua Li static int r5l_recovery_flush_one_meta(struct r5l_log *log, 856355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 857355810d1SShaohua Li { 858355810d1SShaohua Li struct r5conf *conf = log->rdev->mddev->private; 859355810d1SShaohua Li struct r5l_payload_data_parity *payload; 860355810d1SShaohua Li struct r5l_meta_block *mb; 861355810d1SShaohua Li int offset; 862355810d1SShaohua Li sector_t log_offset; 863355810d1SShaohua Li sector_t stripe_sector; 864355810d1SShaohua Li 865355810d1SShaohua Li mb = page_address(ctx->meta_page); 866355810d1SShaohua Li offset = sizeof(struct r5l_meta_block); 867355810d1SShaohua Li log_offset = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS); 868355810d1SShaohua Li 869355810d1SShaohua Li while (offset < le32_to_cpu(mb->meta_size)) { 870355810d1SShaohua Li int dd; 871355810d1SShaohua Li 872355810d1SShaohua Li payload = (void *)mb + offset; 873355810d1SShaohua Li stripe_sector = raid5_compute_sector(conf, 874355810d1SShaohua Li le64_to_cpu(payload->location), 0, &dd, NULL); 875355810d1SShaohua Li if (r5l_recovery_flush_one_stripe(log, ctx, stripe_sector, 876355810d1SShaohua Li &offset, &log_offset)) 877355810d1SShaohua Li return -EINVAL; 878355810d1SShaohua Li } 879355810d1SShaohua Li return 0; 880355810d1SShaohua Li } 881355810d1SShaohua Li 882355810d1SShaohua Li /* copy data/parity from log to raid disks */ 883355810d1SShaohua Li static void r5l_recovery_flush_log(struct r5l_log *log, 884355810d1SShaohua Li struct r5l_recovery_ctx *ctx) 885355810d1SShaohua Li { 886355810d1SShaohua Li while (1) { 887355810d1SShaohua Li if (r5l_read_meta_block(log, ctx)) 888355810d1SShaohua Li return; 889355810d1SShaohua Li if (r5l_recovery_flush_one_meta(log, ctx)) 890355810d1SShaohua Li return; 891355810d1SShaohua Li ctx->seq++; 892355810d1SShaohua Li ctx->pos = r5l_ring_add(log, ctx->pos, ctx->meta_total_blocks); 893355810d1SShaohua Li } 894355810d1SShaohua Li } 895355810d1SShaohua Li 896355810d1SShaohua Li static int r5l_log_write_empty_meta_block(struct r5l_log *log, sector_t pos, 897355810d1SShaohua Li u64 seq) 898355810d1SShaohua Li { 899355810d1SShaohua Li struct page *page; 900355810d1SShaohua Li struct r5l_meta_block *mb; 901355810d1SShaohua Li u32 crc; 902355810d1SShaohua Li 903355810d1SShaohua Li page = alloc_page(GFP_KERNEL | __GFP_ZERO); 904355810d1SShaohua Li if (!page) 905355810d1SShaohua Li return -ENOMEM; 906355810d1SShaohua Li mb = page_address(page); 907355810d1SShaohua Li mb->magic = cpu_to_le32(R5LOG_MAGIC); 908355810d1SShaohua Li mb->version = R5LOG_VERSION; 909355810d1SShaohua Li mb->meta_size = cpu_to_le32(sizeof(struct r5l_meta_block)); 910355810d1SShaohua Li mb->seq = cpu_to_le64(seq); 911355810d1SShaohua Li mb->position = cpu_to_le64(pos); 912*5cb2fbd6SShaohua Li crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 913355810d1SShaohua Li mb->checksum = cpu_to_le32(crc); 914355810d1SShaohua Li 915355810d1SShaohua Li if (!sync_page_io(log->rdev, pos, PAGE_SIZE, page, WRITE_FUA, false)) { 916355810d1SShaohua Li __free_page(page); 917355810d1SShaohua Li return -EIO; 918355810d1SShaohua Li } 919355810d1SShaohua Li __free_page(page); 920355810d1SShaohua Li return 0; 921355810d1SShaohua Li } 922355810d1SShaohua Li 923f6bed0efSShaohua Li static int r5l_recovery_log(struct r5l_log *log) 924f6bed0efSShaohua Li { 925355810d1SShaohua Li struct r5l_recovery_ctx ctx; 926355810d1SShaohua Li 927355810d1SShaohua Li ctx.pos = log->last_checkpoint; 928355810d1SShaohua Li ctx.seq = log->last_cp_seq; 929355810d1SShaohua Li ctx.meta_page = alloc_page(GFP_KERNEL); 930355810d1SShaohua Li if (!ctx.meta_page) 931355810d1SShaohua Li return -ENOMEM; 932355810d1SShaohua Li 933355810d1SShaohua Li r5l_recovery_flush_log(log, &ctx); 934355810d1SShaohua Li __free_page(ctx.meta_page); 935355810d1SShaohua Li 936355810d1SShaohua Li /* 937355810d1SShaohua Li * we did a recovery. Now ctx.pos points to an invalid meta block. New 938355810d1SShaohua Li * log will start here. but we can't let superblock point to last valid 939355810d1SShaohua Li * meta block. The log might looks like: 940355810d1SShaohua Li * | meta 1| meta 2| meta 3| 941355810d1SShaohua Li * meta 1 is valid, meta 2 is invalid. meta 3 could be valid. If 942355810d1SShaohua Li * superblock points to meta 1, we write a new valid meta 2n. if crash 943355810d1SShaohua Li * happens again, new recovery will start from meta 1. Since meta 2n is 944355810d1SShaohua Li * valid now, recovery will think meta 3 is valid, which is wrong. 945355810d1SShaohua Li * The solution is we create a new meta in meta2 with its seq == meta 946355810d1SShaohua Li * 1's seq + 10 and let superblock points to meta2. The same recovery will 947355810d1SShaohua Li * not think meta 3 is a valid meta, because its seq doesn't match 948355810d1SShaohua Li */ 949355810d1SShaohua Li if (ctx.seq > log->last_cp_seq + 1) { 950355810d1SShaohua Li int ret; 951355810d1SShaohua Li 952355810d1SShaohua Li ret = r5l_log_write_empty_meta_block(log, ctx.pos, ctx.seq + 10); 953355810d1SShaohua Li if (ret) 954355810d1SShaohua Li return ret; 955355810d1SShaohua Li log->seq = ctx.seq + 11; 956355810d1SShaohua Li log->log_start = r5l_ring_add(log, ctx.pos, BLOCK_SECTORS); 957355810d1SShaohua Li r5l_write_super(log, ctx.pos); 958355810d1SShaohua Li } else { 959355810d1SShaohua Li log->log_start = ctx.pos; 960355810d1SShaohua Li log->seq = ctx.seq; 961355810d1SShaohua Li } 962f6bed0efSShaohua Li return 0; 963f6bed0efSShaohua Li } 964f6bed0efSShaohua Li 965f6bed0efSShaohua Li static void r5l_write_super(struct r5l_log *log, sector_t cp) 966f6bed0efSShaohua Li { 967f6bed0efSShaohua Li struct mddev *mddev = log->rdev->mddev; 968f6bed0efSShaohua Li 969f6bed0efSShaohua Li log->rdev->journal_tail = cp; 970f6bed0efSShaohua Li set_bit(MD_CHANGE_DEVS, &mddev->flags); 971f6bed0efSShaohua Li } 972f6bed0efSShaohua Li 973f6bed0efSShaohua Li static int r5l_load_log(struct r5l_log *log) 974f6bed0efSShaohua Li { 975f6bed0efSShaohua Li struct md_rdev *rdev = log->rdev; 976f6bed0efSShaohua Li struct page *page; 977f6bed0efSShaohua Li struct r5l_meta_block *mb; 978f6bed0efSShaohua Li sector_t cp = log->rdev->journal_tail; 979f6bed0efSShaohua Li u32 stored_crc, expected_crc; 980f6bed0efSShaohua Li bool create_super = false; 981f6bed0efSShaohua Li int ret; 982f6bed0efSShaohua Li 983f6bed0efSShaohua Li /* Make sure it's valid */ 984f6bed0efSShaohua Li if (cp >= rdev->sectors || round_down(cp, BLOCK_SECTORS) != cp) 985f6bed0efSShaohua Li cp = 0; 986f6bed0efSShaohua Li page = alloc_page(GFP_KERNEL); 987f6bed0efSShaohua Li if (!page) 988f6bed0efSShaohua Li return -ENOMEM; 989f6bed0efSShaohua Li 990f6bed0efSShaohua Li if (!sync_page_io(rdev, cp, PAGE_SIZE, page, READ, false)) { 991f6bed0efSShaohua Li ret = -EIO; 992f6bed0efSShaohua Li goto ioerr; 993f6bed0efSShaohua Li } 994f6bed0efSShaohua Li mb = page_address(page); 995f6bed0efSShaohua Li 996f6bed0efSShaohua Li if (le32_to_cpu(mb->magic) != R5LOG_MAGIC || 997f6bed0efSShaohua Li mb->version != R5LOG_VERSION) { 998f6bed0efSShaohua Li create_super = true; 999f6bed0efSShaohua Li goto create; 1000f6bed0efSShaohua Li } 1001f6bed0efSShaohua Li stored_crc = le32_to_cpu(mb->checksum); 1002f6bed0efSShaohua Li mb->checksum = 0; 1003*5cb2fbd6SShaohua Li expected_crc = crc32c_le(log->uuid_checksum, mb, PAGE_SIZE); 1004f6bed0efSShaohua Li if (stored_crc != expected_crc) { 1005f6bed0efSShaohua Li create_super = true; 1006f6bed0efSShaohua Li goto create; 1007f6bed0efSShaohua Li } 1008f6bed0efSShaohua Li if (le64_to_cpu(mb->position) != cp) { 1009f6bed0efSShaohua Li create_super = true; 1010f6bed0efSShaohua Li goto create; 1011f6bed0efSShaohua Li } 1012f6bed0efSShaohua Li create: 1013f6bed0efSShaohua Li if (create_super) { 1014f6bed0efSShaohua Li log->last_cp_seq = prandom_u32(); 1015f6bed0efSShaohua Li cp = 0; 1016f6bed0efSShaohua Li /* 1017f6bed0efSShaohua Li * Make sure super points to correct address. Log might have 1018f6bed0efSShaohua Li * data very soon. If super hasn't correct log tail address, 1019f6bed0efSShaohua Li * recovery can't find the log 1020f6bed0efSShaohua Li */ 1021f6bed0efSShaohua Li r5l_write_super(log, cp); 1022f6bed0efSShaohua Li } else 1023f6bed0efSShaohua Li log->last_cp_seq = le64_to_cpu(mb->seq); 1024f6bed0efSShaohua Li 1025f6bed0efSShaohua Li log->device_size = round_down(rdev->sectors, BLOCK_SECTORS); 10260576b1c6SShaohua Li log->max_free_space = log->device_size >> RECLAIM_MAX_FREE_SPACE_SHIFT; 10270576b1c6SShaohua Li if (log->max_free_space > RECLAIM_MAX_FREE_SPACE) 10280576b1c6SShaohua Li log->max_free_space = RECLAIM_MAX_FREE_SPACE; 1029f6bed0efSShaohua Li log->last_checkpoint = cp; 1030f6bed0efSShaohua Li 1031f6bed0efSShaohua Li __free_page(page); 1032f6bed0efSShaohua Li 1033f6bed0efSShaohua Li return r5l_recovery_log(log); 1034f6bed0efSShaohua Li ioerr: 1035f6bed0efSShaohua Li __free_page(page); 1036f6bed0efSShaohua Li return ret; 1037f6bed0efSShaohua Li } 1038f6bed0efSShaohua Li 1039f6bed0efSShaohua Li int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) 1040f6bed0efSShaohua Li { 1041f6bed0efSShaohua Li struct r5l_log *log; 1042f6bed0efSShaohua Li 1043f6bed0efSShaohua Li if (PAGE_SIZE != 4096) 1044f6bed0efSShaohua Li return -EINVAL; 1045f6bed0efSShaohua Li log = kzalloc(sizeof(*log), GFP_KERNEL); 1046f6bed0efSShaohua Li if (!log) 1047f6bed0efSShaohua Li return -ENOMEM; 1048f6bed0efSShaohua Li log->rdev = rdev; 1049f6bed0efSShaohua Li 1050*5cb2fbd6SShaohua Li log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, 1051f6bed0efSShaohua Li sizeof(rdev->mddev->uuid)); 1052f6bed0efSShaohua Li 1053f6bed0efSShaohua Li mutex_init(&log->io_mutex); 1054f6bed0efSShaohua Li 1055f6bed0efSShaohua Li spin_lock_init(&log->io_list_lock); 1056f6bed0efSShaohua Li INIT_LIST_HEAD(&log->running_ios); 10570576b1c6SShaohua Li INIT_LIST_HEAD(&log->io_end_ios); 10580576b1c6SShaohua Li INIT_LIST_HEAD(&log->stripe_end_ios); 1059f6bed0efSShaohua Li 1060f6bed0efSShaohua Li log->io_kc = KMEM_CACHE(r5l_io_unit, 0); 1061f6bed0efSShaohua Li if (!log->io_kc) 1062f6bed0efSShaohua Li goto io_kc; 1063f6bed0efSShaohua Li 10640576b1c6SShaohua Li log->reclaim_thread = md_register_thread(r5l_reclaim_thread, 10650576b1c6SShaohua Li log->rdev->mddev, "reclaim"); 10660576b1c6SShaohua Li if (!log->reclaim_thread) 10670576b1c6SShaohua Li goto reclaim_thread; 10680576b1c6SShaohua Li 1069f6bed0efSShaohua Li INIT_LIST_HEAD(&log->no_space_stripes); 1070f6bed0efSShaohua Li spin_lock_init(&log->no_space_stripes_lock); 1071f6bed0efSShaohua Li 1072f6bed0efSShaohua Li if (r5l_load_log(log)) 1073f6bed0efSShaohua Li goto error; 1074f6bed0efSShaohua Li 1075f6bed0efSShaohua Li conf->log = log; 1076f6bed0efSShaohua Li return 0; 1077f6bed0efSShaohua Li error: 10780576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 10790576b1c6SShaohua Li reclaim_thread: 1080f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 1081f6bed0efSShaohua Li io_kc: 1082f6bed0efSShaohua Li kfree(log); 1083f6bed0efSShaohua Li return -EINVAL; 1084f6bed0efSShaohua Li } 1085f6bed0efSShaohua Li 1086f6bed0efSShaohua Li void r5l_exit_log(struct r5l_log *log) 1087f6bed0efSShaohua Li { 10880576b1c6SShaohua Li /* 10890576b1c6SShaohua Li * at this point all stripes are finished, so io_unit is at least in 10900576b1c6SShaohua Li * STRIPE_END state 10910576b1c6SShaohua Li */ 10920576b1c6SShaohua Li r5l_wake_reclaim(log, -1L); 10930576b1c6SShaohua Li md_unregister_thread(&log->reclaim_thread); 10940576b1c6SShaohua Li r5l_do_reclaim(log); 10950576b1c6SShaohua Li /* 10960576b1c6SShaohua Li * force a super update, r5l_do_reclaim might updated the super. 10970576b1c6SShaohua Li * mddev->thread is already stopped 10980576b1c6SShaohua Li */ 10990576b1c6SShaohua Li md_update_sb(log->rdev->mddev, 1); 11000576b1c6SShaohua Li 1101f6bed0efSShaohua Li kmem_cache_destroy(log->io_kc); 1102f6bed0efSShaohua Li kfree(log); 1103f6bed0efSShaohua Li } 1104