11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * RAID-1 management functions. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 111da177e4SLinus Torvalds * 1296de0e25SJan Engelhardt * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> 131da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> 141da177e4SLinus Torvalds * 15191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support 16191ea9b2SNeilBrown * bitmapped intelligence in resync: 17191ea9b2SNeilBrown * 18191ea9b2SNeilBrown * - bitmap marked during normal i/o 19191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync 20191ea9b2SNeilBrown * 21191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: 22191ea9b2SNeilBrown * - persistent bitmap code 23191ea9b2SNeilBrown * 241da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 251da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 261da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 271da177e4SLinus Torvalds * any later version. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 301da177e4SLinus Torvalds * (for example /usr/src/linux/COPYING); if not, write to the Free 311da177e4SLinus Torvalds * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 345a0e3ad6STejun Heo #include <linux/slab.h> 3525570727SStephen Rothwell #include <linux/delay.h> 36bff61975SNeilBrown #include <linux/blkdev.h> 37056075c7SPaul Gortmaker #include <linux/module.h> 38bff61975SNeilBrown #include <linux/seq_file.h> 398bda470eSChristian Dietrich #include <linux/ratelimit.h> 40109e3765SNeilBrown #include <trace/events/block.h> 4143b2e5d8SNeilBrown #include "md.h" 42ef740c37SChristoph Hellwig #include "raid1.h" 43ef740c37SChristoph Hellwig #include "bitmap.h" 44191ea9b2SNeilBrown 45394ed8e4SShaohua Li #define UNSUPPORTED_MDDEV_FLAGS \ 46394ed8e4SShaohua Li ((1L << MD_HAS_JOURNAL) | \ 47394ed8e4SShaohua Li (1L << MD_JOURNAL_CLEAN)) 48394ed8e4SShaohua Li 491da177e4SLinus Torvalds /* 501da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 511da177e4SLinus Torvalds */ 521da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 531da177e4SLinus Torvalds 54473e87ceSJonathan Brassow /* when we get a read error on a read-only array, we redirect to another 55473e87ceSJonathan Brassow * device without failing the first device, or trying to over-write to 56473e87ceSJonathan Brassow * correct the read error. To keep track of bad blocks on a per-bio 57473e87ceSJonathan Brassow * level, we store IO_BLOCKED in the appropriate 'bios' pointer 58473e87ceSJonathan Brassow */ 59473e87ceSJonathan Brassow #define IO_BLOCKED ((struct bio *)1) 60473e87ceSJonathan Brassow /* When we successfully write to a known bad-block, we need to remove the 61473e87ceSJonathan Brassow * bad-block marking which must be done from process context. So we record 62473e87ceSJonathan Brassow * the success by setting devs[n].bio to IO_MADE_GOOD 63473e87ceSJonathan Brassow */ 64473e87ceSJonathan Brassow #define IO_MADE_GOOD ((struct bio *)2) 65473e87ceSJonathan Brassow 66473e87ceSJonathan Brassow #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 67473e87ceSJonathan Brassow 6834db0cd6SNeilBrown /* When there are this many requests queue to be written by 6934db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 7034db0cd6SNeilBrown * for writeback. 7134db0cd6SNeilBrown */ 7234db0cd6SNeilBrown static int max_queued_requests = 1024; 731da177e4SLinus Torvalds 7479ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 7579ef3a8aSmajianpeng sector_t bi_sector); 76e8096360SNeilBrown static void lower_barrier(struct r1conf *conf); 771da177e4SLinus Torvalds 78578b54adSNeilBrown #define raid1_log(md, fmt, args...) \ 79578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) 80578b54adSNeilBrown 81dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds struct pool_info *pi = data; 849f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 877eaceaccSJens Axboe return kzalloc(size, gfp_flags); 881da177e4SLinus Torvalds } 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 911da177e4SLinus Torvalds { 921da177e4SLinus Torvalds kfree(r1_bio); 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 968e005f7cSmajianpeng #define RESYNC_DEPTH 32 971da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 981da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 998e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 1008e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 101c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 102c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 1038e005f7cSmajianpeng #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS) 1041da177e4SLinus Torvalds 105dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1061da177e4SLinus Torvalds { 1071da177e4SLinus Torvalds struct pool_info *pi = data; 1089f2c9d12SNeilBrown struct r1bio *r1_bio; 1091da177e4SLinus Torvalds struct bio *bio; 110da1aab3dSNeilBrown int need_pages; 1111da177e4SLinus Torvalds int i, j; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1147eaceaccSJens Axboe if (!r1_bio) 1151da177e4SLinus Torvalds return NULL; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds /* 1181da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1191da177e4SLinus Torvalds */ 1201da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1216746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1221da177e4SLinus Torvalds if (!bio) 1231da177e4SLinus Torvalds goto out_free_bio; 1241da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds /* 1271da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 128d11c171eSNeilBrown * the first bio. 129d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 130d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1311da177e4SLinus Torvalds */ 132d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 133da1aab3dSNeilBrown need_pages = pi->raid_disks; 134d11c171eSNeilBrown else 135da1aab3dSNeilBrown need_pages = 1; 136da1aab3dSNeilBrown for (j = 0; j < need_pages; j++) { 137d11c171eSNeilBrown bio = r1_bio->bios[j]; 138a0787606SKent Overstreet bio->bi_vcnt = RESYNC_PAGES; 1391da177e4SLinus Torvalds 140a0787606SKent Overstreet if (bio_alloc_pages(bio, gfp_flags)) 141da1aab3dSNeilBrown goto out_free_pages; 142d11c171eSNeilBrown } 143d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 144d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 145d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 146d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 147d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 148d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 149d11c171eSNeilBrown } 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds return r1_bio; 1541da177e4SLinus Torvalds 155da1aab3dSNeilBrown out_free_pages: 156491221f8SGuoqing Jiang while (--j >= 0) 157491221f8SGuoqing Jiang bio_free_pages(r1_bio->bios[j]); 158da1aab3dSNeilBrown 1591da177e4SLinus Torvalds out_free_bio: 1601da177e4SLinus Torvalds while (++j < pi->raid_disks) 1611da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1621da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1631da177e4SLinus Torvalds return NULL; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1671da177e4SLinus Torvalds { 1681da177e4SLinus Torvalds struct pool_info *pi = data; 169d11c171eSNeilBrown int i,j; 1709f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 1711da177e4SLinus Torvalds 172d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 173d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 174d11c171eSNeilBrown if (j == 0 || 175d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 176d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1771345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1801da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds 185e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 1861da177e4SLinus Torvalds { 1871da177e4SLinus Torvalds int i; 1881da177e4SLinus Torvalds 1898f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1901da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1914367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1921da177e4SLinus Torvalds bio_put(*bio); 1931da177e4SLinus Torvalds *bio = NULL; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1979f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 1981da177e4SLinus Torvalds { 199e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 2021da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds 2059f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2061da177e4SLinus Torvalds { 207e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2083e198f78SNeilBrown int i; 2093e198f78SNeilBrown 2108f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2113e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2123e198f78SNeilBrown if (bio->bi_end_io) 2133e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2143e198f78SNeilBrown } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2171da177e4SLinus Torvalds 21817999be4SNeilBrown lower_barrier(conf); 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2219f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds unsigned long flags; 224fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 225e8096360SNeilBrown struct r1conf *conf = mddev->private; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2281da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 229ddaf22abSNeilBrown conf->nr_queued ++; 2301da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2311da177e4SLinus Torvalds 23217999be4SNeilBrown wake_up(&conf->wait_barrier); 2331da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds /* 2371da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2381da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2391da177e4SLinus Torvalds * cache layer. 2401da177e4SLinus Torvalds */ 2419f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 242d2eb35acSNeilBrown { 243d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 244d2eb35acSNeilBrown int done; 245e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 24679ef3a8aSmajianpeng sector_t start_next_window = r1_bio->start_next_window; 2474f024f37SKent Overstreet sector_t bi_sector = bio->bi_iter.bi_sector; 248d2eb35acSNeilBrown 249d2eb35acSNeilBrown if (bio->bi_phys_segments) { 250d2eb35acSNeilBrown unsigned long flags; 251d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 252d2eb35acSNeilBrown bio->bi_phys_segments--; 253d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 254d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25579ef3a8aSmajianpeng /* 25679ef3a8aSmajianpeng * make_request() might be waiting for 25779ef3a8aSmajianpeng * bi_phys_segments to decrease 25879ef3a8aSmajianpeng */ 25979ef3a8aSmajianpeng wake_up(&conf->wait_barrier); 260d2eb35acSNeilBrown } else 261d2eb35acSNeilBrown done = 1; 262d2eb35acSNeilBrown 263d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2644246a0b6SChristoph Hellwig bio->bi_error = -EIO; 2654246a0b6SChristoph Hellwig 266d2eb35acSNeilBrown if (done) { 2674246a0b6SChristoph Hellwig bio_endio(bio); 268d2eb35acSNeilBrown /* 269d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 270d2eb35acSNeilBrown * to go idle. 271d2eb35acSNeilBrown */ 27279ef3a8aSmajianpeng allow_barrier(conf, start_next_window, bi_sector); 273d2eb35acSNeilBrown } 274d2eb35acSNeilBrown } 275d2eb35acSNeilBrown 2769f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2791da177e4SLinus Torvalds 2804b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2814b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 28236a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2834b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2844f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 2854f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 2864b6d287fSNeilBrown 287d2eb35acSNeilBrown call_bio_endio(r1_bio); 2884b6d287fSNeilBrown } 2891da177e4SLinus Torvalds free_r1bio(r1_bio); 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* 2931da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2941da177e4SLinus Torvalds */ 2959f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 2961da177e4SLinus Torvalds { 297e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3001da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 303ba3ae3beSNamhyung Kim /* 304ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 305ba3ae3beSNamhyung Kim */ 3069f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 307ba3ae3beSNamhyung Kim { 308ba3ae3beSNamhyung Kim int mirror; 30930194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 31030194636SNeilBrown int raid_disks = conf->raid_disks; 311ba3ae3beSNamhyung Kim 3128f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 313ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 314ba3ae3beSNamhyung Kim break; 315ba3ae3beSNamhyung Kim 3168f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 317ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 318ba3ae3beSNamhyung Kim 319ba3ae3beSNamhyung Kim return mirror; 320ba3ae3beSNamhyung Kim } 321ba3ae3beSNamhyung Kim 3224246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3231da177e4SLinus Torvalds { 3244246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 3259f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 326e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 327e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* 3301da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3311da177e4SLinus Torvalds */ 332e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 333ddaf22abSNeilBrown 334220946c9SNeilBrown if (uptodate) 3351da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3362e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3372e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3382e52d449SNeilBrown /* This was a fail-fast read so we definitely 3392e52d449SNeilBrown * want to retry */ 3402e52d449SNeilBrown ; 341dd00a99eSNeilBrown else { 342dd00a99eSNeilBrown /* If all other devices have failed, we want to return 343dd00a99eSNeilBrown * the error upwards rather than fail the last device. 344dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 345dd00a99eSNeilBrown */ 346dd00a99eSNeilBrown unsigned long flags; 347dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 348dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 349dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 350e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 351dd00a99eSNeilBrown uptodate = 1; 352dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 353dd00a99eSNeilBrown } 3541da177e4SLinus Torvalds 3557ad4d4a6SNeilBrown if (uptodate) { 3561da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 357e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3587ad4d4a6SNeilBrown } else { 3591da177e4SLinus Torvalds /* 3601da177e4SLinus Torvalds * oops, read error: 3611da177e4SLinus Torvalds */ 3621da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3631d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 3649dd1e2faSNeilBrown mdname(conf->mddev), 3651d41c216SNeilBrown bdevname(rdev->bdev, b), 3668bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 367d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3681da177e4SLinus Torvalds reschedule_retry(r1_bio); 3697ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds 3739f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3744e78064fSNeilBrown { 3754e78064fSNeilBrown /* it really is the end of this request */ 3764e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3774e78064fSNeilBrown /* free extra copy of the data pages */ 378af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3794e78064fSNeilBrown while (i--) 3802ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3812ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3822ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3834e78064fSNeilBrown } 3844e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3854e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3864e78064fSNeilBrown r1_bio->sectors, 3874e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 388af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3894e78064fSNeilBrown md_write_end(r1_bio->mddev); 390cd5ff9a1SNeilBrown } 391cd5ff9a1SNeilBrown 3929f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 393cd5ff9a1SNeilBrown { 394cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 395cd5ff9a1SNeilBrown return; 396cd5ff9a1SNeilBrown 397cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 398cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 399cd5ff9a1SNeilBrown else { 400cd5ff9a1SNeilBrown close_write(r1_bio); 4014367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4024367af55SNeilBrown reschedule_retry(r1_bio); 4034367af55SNeilBrown else 4044e78064fSNeilBrown raid_end_bio_io(r1_bio); 4054e78064fSNeilBrown } 4064e78064fSNeilBrown } 4074e78064fSNeilBrown 4084246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4091da177e4SLinus Torvalds { 4109f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 411e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 412e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 41304b857f7SNeilBrown struct bio *to_put = NULL; 414e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 415e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 416e3f948cdSShaohua Li bool discard_error; 417e3f948cdSShaohua Li 418e3f948cdSShaohua Li discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* 421e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4221da177e4SLinus Torvalds */ 423e3f948cdSShaohua Li if (bio->bi_error && !discard_error) { 424e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 425e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 42619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 42719d67169SNeilBrown conf->mddev->recovery); 42819d67169SNeilBrown 429212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 430212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 431212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 432212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 433212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 434212e7eb7SNeilBrown if (!test_bit(Faulty, &rdev->flags)) 435212e7eb7SNeilBrown /* This is the only remaining device, 436212e7eb7SNeilBrown * We need to retry the write without 437212e7eb7SNeilBrown * FailFast 438212e7eb7SNeilBrown */ 439212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 440212e7eb7SNeilBrown else { 441212e7eb7SNeilBrown /* Finished with this branch */ 442212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 443212e7eb7SNeilBrown to_put = bio; 444212e7eb7SNeilBrown } 445212e7eb7SNeilBrown } else 446cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4474367af55SNeilBrown } else { 4481da177e4SLinus Torvalds /* 449e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 450e9c7469bSTejun Heo * will return a good error code for to the higher 451e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 452e9c7469bSTejun Heo * fails. 4531da177e4SLinus Torvalds * 454e9c7469bSTejun Heo * The 'master' represents the composite IO operation 455e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 456e9c7469bSTejun Heo * will wait for the 'master' bio. 4571da177e4SLinus Torvalds */ 4584367af55SNeilBrown sector_t first_bad; 4594367af55SNeilBrown int bad_sectors; 4604367af55SNeilBrown 461cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 462cd5ff9a1SNeilBrown to_put = bio; 4633056e3aeSAlex Lyakas /* 4643056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4653056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4663056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4673056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4683056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4693056e3aeSAlex Lyakas * check this here. 4703056e3aeSAlex Lyakas */ 471e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 472e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 4731da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4741da177e4SLinus Torvalds 4754367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 476e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 477e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 4784367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4794367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4804367af55SNeilBrown } 4814367af55SNeilBrown } 4824367af55SNeilBrown 4834b6d287fSNeilBrown if (behind) { 484e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 4854b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4864b6d287fSNeilBrown 487e9c7469bSTejun Heo /* 488e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 489e9c7469bSTejun Heo * has safely reached all non-writemostly 490e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 491e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 492e9c7469bSTejun Heo * -EIO here, instead we'll wait 493e9c7469bSTejun Heo */ 4944b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4954b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4964b6d287fSNeilBrown /* Maybe we can return now */ 4974b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4984b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 49936a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 50036a4e1feSNeilBrown " %llu-%llu\n", 5014f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5024f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 503d2eb35acSNeilBrown call_bio_endio(r1_bio); 5044b6d287fSNeilBrown } 5054b6d287fSNeilBrown } 5064b6d287fSNeilBrown } 5074367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 508e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 509e9c7469bSTejun Heo 5101da177e4SLinus Torvalds /* 5111da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5121da177e4SLinus Torvalds * already. 5131da177e4SLinus Torvalds */ 514af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 515c70810b3SNeilBrown 51604b857f7SNeilBrown if (to_put) 51704b857f7SNeilBrown bio_put(to_put); 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5221da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5231da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5241da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5251da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5261da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5271da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5281da177e4SLinus Torvalds * 5291da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5301da177e4SLinus Torvalds * because position is mirror, not device based. 5311da177e4SLinus Torvalds * 5321da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5331da177e4SLinus Torvalds */ 534e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5351da177e4SLinus Torvalds { 536af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 537d2eb35acSNeilBrown int sectors; 538d2eb35acSNeilBrown int best_good_sectors; 5399dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5409dedf603SShaohua Li int has_nonrot_disk; 541be4d3280SShaohua Li int disk; 54276073054SNeilBrown sector_t best_dist; 5439dedf603SShaohua Li unsigned int min_pending; 5443cb03002SNeilBrown struct md_rdev *rdev; 545f3ac8bf7SNeilBrown int choose_first; 54612cee5a8SShaohua Li int choose_next_idle; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds rcu_read_lock(); 5491da177e4SLinus Torvalds /* 5508ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5511da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5521da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5531da177e4SLinus Torvalds */ 5541da177e4SLinus Torvalds retry: 555d2eb35acSNeilBrown sectors = r1_bio->sectors; 55676073054SNeilBrown best_disk = -1; 5579dedf603SShaohua Li best_dist_disk = -1; 55876073054SNeilBrown best_dist = MaxSector; 5599dedf603SShaohua Li best_pending_disk = -1; 5609dedf603SShaohua Li min_pending = UINT_MAX; 561d2eb35acSNeilBrown best_good_sectors = 0; 5629dedf603SShaohua Li has_nonrot_disk = 0; 56312cee5a8SShaohua Li choose_next_idle = 0; 5642e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 565d2eb35acSNeilBrown 5667d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 5677d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 56890382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 5697d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 5707d49ffcfSGoldwyn Rodrigues choose_first = 1; 5717d49ffcfSGoldwyn Rodrigues else 5727d49ffcfSGoldwyn Rodrigues choose_first = 0; 5731da177e4SLinus Torvalds 574be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 57576073054SNeilBrown sector_t dist; 576d2eb35acSNeilBrown sector_t first_bad; 577d2eb35acSNeilBrown int bad_sectors; 5789dedf603SShaohua Li unsigned int pending; 57912cee5a8SShaohua Li bool nonrot; 580d2eb35acSNeilBrown 581f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 582f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 583f3ac8bf7SNeilBrown || rdev == NULL 58476073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 585f3ac8bf7SNeilBrown continue; 58676073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 58776073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 58876073054SNeilBrown continue; 58976073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 59076073054SNeilBrown /* Don't balance among write-mostly, just 59176073054SNeilBrown * use the first as a last resort */ 592d1901ef0STomáš Hodek if (best_dist_disk < 0) { 593307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 594307729c8SNeilBrown &first_bad, &bad_sectors)) { 595816b0acfSWei Fang if (first_bad <= this_sector) 596307729c8SNeilBrown /* Cannot use this */ 597307729c8SNeilBrown continue; 598307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 599307729c8SNeilBrown } else 600307729c8SNeilBrown best_good_sectors = sectors; 601d1901ef0STomáš Hodek best_dist_disk = disk; 602d1901ef0STomáš Hodek best_pending_disk = disk; 603307729c8SNeilBrown } 60476073054SNeilBrown continue; 6058ddf9efeSNeilBrown } 60676073054SNeilBrown /* This is a reasonable device to use. It might 60776073054SNeilBrown * even be best. 6081da177e4SLinus Torvalds */ 609d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 610d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 611d2eb35acSNeilBrown if (best_dist < MaxSector) 612d2eb35acSNeilBrown /* already have a better device */ 613d2eb35acSNeilBrown continue; 614d2eb35acSNeilBrown if (first_bad <= this_sector) { 615d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 616d2eb35acSNeilBrown * device, then we must not read beyond 617d2eb35acSNeilBrown * bad_sectors from another device.. 618d2eb35acSNeilBrown */ 619d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 620d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 621d2eb35acSNeilBrown sectors = bad_sectors; 622d2eb35acSNeilBrown if (best_good_sectors > sectors) 623d2eb35acSNeilBrown best_good_sectors = sectors; 624d2eb35acSNeilBrown 625d2eb35acSNeilBrown } else { 626d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 627d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 628d2eb35acSNeilBrown best_good_sectors = good_sectors; 629d2eb35acSNeilBrown best_disk = disk; 630d2eb35acSNeilBrown } 631d2eb35acSNeilBrown if (choose_first) 632d2eb35acSNeilBrown break; 633d2eb35acSNeilBrown } 634d2eb35acSNeilBrown continue; 635d2eb35acSNeilBrown } else 636d2eb35acSNeilBrown best_good_sectors = sectors; 637d2eb35acSNeilBrown 6382e52d449SNeilBrown if (best_disk >= 0) 6392e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 6402e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 6412e52d449SNeilBrown 64212cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 64312cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6449dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 64576073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 64612cee5a8SShaohua Li if (choose_first) { 64776073054SNeilBrown best_disk = disk; 6481da177e4SLinus Torvalds break; 6491da177e4SLinus Torvalds } 65012cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 65112cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 65212cee5a8SShaohua Li || dist == 0) { 65312cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 65412cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 65512cee5a8SShaohua Li 65612cee5a8SShaohua Li best_disk = disk; 65712cee5a8SShaohua Li /* 65812cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 65912cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 66012cee5a8SShaohua Li * the idle disk. read_balance could already choose an 66112cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 66212cee5a8SShaohua Li * this disk. This doesn't matter because this disk 66312cee5a8SShaohua Li * will idle, next time it will be utilized after the 66412cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 66512cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 66612cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 66712cee5a8SShaohua Li * small, but not a big deal since when the second disk 66812cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 66912cee5a8SShaohua Li */ 67012cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 67112cee5a8SShaohua Li mirror->seq_start != MaxSector && 67212cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 67312cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 67412cee5a8SShaohua Li mirror->seq_start) { 67512cee5a8SShaohua Li choose_next_idle = 1; 67612cee5a8SShaohua Li continue; 67712cee5a8SShaohua Li } 67812cee5a8SShaohua Li break; 67912cee5a8SShaohua Li } 68012cee5a8SShaohua Li 68112cee5a8SShaohua Li if (choose_next_idle) 68212cee5a8SShaohua Li continue; 6839dedf603SShaohua Li 6849dedf603SShaohua Li if (min_pending > pending) { 6859dedf603SShaohua Li min_pending = pending; 6869dedf603SShaohua Li best_pending_disk = disk; 6879dedf603SShaohua Li } 6889dedf603SShaohua Li 68976073054SNeilBrown if (dist < best_dist) { 69076073054SNeilBrown best_dist = dist; 6919dedf603SShaohua Li best_dist_disk = disk; 6921da177e4SLinus Torvalds } 693f3ac8bf7SNeilBrown } 6941da177e4SLinus Torvalds 6959dedf603SShaohua Li /* 6969dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 6979dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 6989dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 6999dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7009dedf603SShaohua Li */ 7019dedf603SShaohua Li if (best_disk == -1) { 7022e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7039dedf603SShaohua Li best_disk = best_pending_disk; 7049dedf603SShaohua Li else 7059dedf603SShaohua Li best_disk = best_dist_disk; 7069dedf603SShaohua Li } 7079dedf603SShaohua Li 70876073054SNeilBrown if (best_disk >= 0) { 70976073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7108ddf9efeSNeilBrown if (!rdev) 7118ddf9efeSNeilBrown goto retry; 7128ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 713d2eb35acSNeilBrown sectors = best_good_sectors; 71412cee5a8SShaohua Li 71512cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 71612cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 71712cee5a8SShaohua Li 718be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds rcu_read_unlock(); 721d2eb35acSNeilBrown *max_sectors = sectors; 7221da177e4SLinus Torvalds 72376073054SNeilBrown return best_disk; 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds 7265c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7270d129228SNeilBrown { 728e8096360SNeilBrown struct r1conf *conf = mddev->private; 7290d129228SNeilBrown int i, ret = 0; 7300d129228SNeilBrown 7314452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 73234db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 73334db0cd6SNeilBrown return 1; 73434db0cd6SNeilBrown 7350d129228SNeilBrown rcu_read_lock(); 736f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7373cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7380d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 739165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7400d129228SNeilBrown 7411ed7242eSJonathan Brassow BUG_ON(!q); 7421ed7242eSJonathan Brassow 7430d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7440d129228SNeilBrown * non-congested targets, it can be removed 7450d129228SNeilBrown */ 7464452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 747dc3b17ccSJan Kara ret |= bdi_congested(q->backing_dev_info, bits); 7480d129228SNeilBrown else 749dc3b17ccSJan Kara ret &= bdi_congested(q->backing_dev_info, bits); 7500d129228SNeilBrown } 7510d129228SNeilBrown } 7520d129228SNeilBrown rcu_read_unlock(); 7530d129228SNeilBrown return ret; 7540d129228SNeilBrown } 7550d129228SNeilBrown 756e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 757a35e63efSNeilBrown { 758a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 759a35e63efSNeilBrown * bitmap updates get flushed here. 760a35e63efSNeilBrown */ 761a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 762a35e63efSNeilBrown 763a35e63efSNeilBrown if (conf->pending_bio_list.head) { 764a35e63efSNeilBrown struct bio *bio; 765a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 76634db0cd6SNeilBrown conf->pending_count = 0; 767a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 768a35e63efSNeilBrown /* flush any pending bitmap writes to 769a35e63efSNeilBrown * disk before proceeding w/ I/O */ 770a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 77134db0cd6SNeilBrown wake_up(&conf->wait_barrier); 772a35e63efSNeilBrown 773a35e63efSNeilBrown while (bio) { /* submit pending writes */ 774a35e63efSNeilBrown struct bio *next = bio->bi_next; 7755e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 776a35e63efSNeilBrown bio->bi_next = NULL; 7775e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 7785e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 7795e2c7a36SNeilBrown bio->bi_error = -EIO; 7805e2c7a36SNeilBrown bio_endio(bio); 7815e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 7822ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 7832ff8cc2cSShaohua Li /* Just ignore it */ 7844246a0b6SChristoph Hellwig bio_endio(bio); 7852ff8cc2cSShaohua Li else 786a35e63efSNeilBrown generic_make_request(bio); 787a35e63efSNeilBrown bio = next; 788a35e63efSNeilBrown } 789a35e63efSNeilBrown } else 790a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 7917eaceaccSJens Axboe } 7927eaceaccSJens Axboe 79317999be4SNeilBrown /* Barriers.... 79417999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 79517999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 79617999be4SNeilBrown * To do this we raise a 'barrier'. 79717999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 79817999be4SNeilBrown * to count how many activities are happening which preclude 79917999be4SNeilBrown * normal IO. 80017999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 80117999be4SNeilBrown * i.e. if nr_pending == 0. 80217999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 80317999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 80417999be4SNeilBrown * is ready, no other operations which require a barrier will start 80517999be4SNeilBrown * until the IO request has had a chance. 80617999be4SNeilBrown * 80717999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 80817999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 80917999be4SNeilBrown * allow_barrier when it has finished its IO. 81017999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 81117999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 81217999be4SNeilBrown * lower_barrier when the particular background IO completes. 8131da177e4SLinus Torvalds */ 814c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 8151da177e4SLinus Torvalds { 8161da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8171da177e4SLinus Torvalds 81817999be4SNeilBrown /* Wait until no block IO is waiting */ 81917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 820eed8c02eSLukas Czerner conf->resync_lock); 82117999be4SNeilBrown 82217999be4SNeilBrown /* block any new IO from starting */ 82317999be4SNeilBrown conf->barrier++; 824c2fd4c94SNeilBrown conf->next_resync = sector_nr; 82517999be4SNeilBrown 82679ef3a8aSmajianpeng /* For these conditions we must wait: 82779ef3a8aSmajianpeng * A: while the array is in frozen state 82879ef3a8aSmajianpeng * B: while barrier >= RESYNC_DEPTH, meaning resync reach 82979ef3a8aSmajianpeng * the max count which allowed. 83079ef3a8aSmajianpeng * C: next_resync + RESYNC_SECTORS > start_next_window, meaning 83179ef3a8aSmajianpeng * next resync will reach to the window which normal bios are 83279ef3a8aSmajianpeng * handling. 8332f73d3c5SNeilBrown * D: while there are any active requests in the current window. 83479ef3a8aSmajianpeng */ 83517999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 836b364e3d0Smajianpeng !conf->array_frozen && 83779ef3a8aSmajianpeng conf->barrier < RESYNC_DEPTH && 8382f73d3c5SNeilBrown conf->current_window_requests == 0 && 83979ef3a8aSmajianpeng (conf->start_next_window >= 84079ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS), 841eed8c02eSLukas Czerner conf->resync_lock); 84217999be4SNeilBrown 84334e97f17SNeilBrown conf->nr_pending++; 8441da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds 847e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 84817999be4SNeilBrown { 84917999be4SNeilBrown unsigned long flags; 850709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 85117999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 85217999be4SNeilBrown conf->barrier--; 85334e97f17SNeilBrown conf->nr_pending--; 85417999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 85517999be4SNeilBrown wake_up(&conf->wait_barrier); 85617999be4SNeilBrown } 85717999be4SNeilBrown 85879ef3a8aSmajianpeng static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio) 85917999be4SNeilBrown { 86079ef3a8aSmajianpeng bool wait = false; 86179ef3a8aSmajianpeng 86279ef3a8aSmajianpeng if (conf->array_frozen || !bio) 86379ef3a8aSmajianpeng wait = true; 86479ef3a8aSmajianpeng else if (conf->barrier && bio_data_dir(bio) == WRITE) { 86523554960SNeilBrown if ((conf->mddev->curr_resync_completed 86679ef3a8aSmajianpeng >= bio_end_sector(bio)) || 867f2c771a6SNeilBrown (conf->start_next_window + NEXT_NORMALIO_DISTANCE 8684f024f37SKent Overstreet <= bio->bi_iter.bi_sector)) 86979ef3a8aSmajianpeng wait = false; 87079ef3a8aSmajianpeng else 87179ef3a8aSmajianpeng wait = true; 87279ef3a8aSmajianpeng } 87379ef3a8aSmajianpeng 87479ef3a8aSmajianpeng return wait; 87579ef3a8aSmajianpeng } 87679ef3a8aSmajianpeng 87779ef3a8aSmajianpeng static sector_t wait_barrier(struct r1conf *conf, struct bio *bio) 87879ef3a8aSmajianpeng { 87979ef3a8aSmajianpeng sector_t sector = 0; 88079ef3a8aSmajianpeng 88117999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 88279ef3a8aSmajianpeng if (need_to_wait_for_sync(conf, bio)) { 88317999be4SNeilBrown conf->nr_waiting++; 884d6b42dcbSNeilBrown /* Wait for the barrier to drop. 885d6b42dcbSNeilBrown * However if there are already pending 886d6b42dcbSNeilBrown * requests (preventing the barrier from 887d6b42dcbSNeilBrown * rising completely), and the 8885965b642SNeilBrown * per-process bio queue isn't empty, 889d6b42dcbSNeilBrown * then don't wait, as we need to empty 8905965b642SNeilBrown * that queue to allow conf->start_next_window 8915965b642SNeilBrown * to increase. 892d6b42dcbSNeilBrown */ 893578b54adSNeilBrown raid1_log(conf->mddev, "wait barrier"); 894d6b42dcbSNeilBrown wait_event_lock_irq(conf->wait_barrier, 895b364e3d0Smajianpeng !conf->array_frozen && 896b364e3d0Smajianpeng (!conf->barrier || 89779ef3a8aSmajianpeng ((conf->start_next_window < 89879ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS) && 899d6b42dcbSNeilBrown current->bio_list && 900b364e3d0Smajianpeng !bio_list_empty(current->bio_list))), 901eed8c02eSLukas Czerner conf->resync_lock); 90217999be4SNeilBrown conf->nr_waiting--; 90317999be4SNeilBrown } 90479ef3a8aSmajianpeng 90579ef3a8aSmajianpeng if (bio && bio_data_dir(bio) == WRITE) { 906e8ff8bf0SJes Sorensen if (bio->bi_iter.bi_sector >= conf->next_resync) { 90779ef3a8aSmajianpeng if (conf->start_next_window == MaxSector) 90879ef3a8aSmajianpeng conf->start_next_window = 90979ef3a8aSmajianpeng conf->next_resync + 91079ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 91179ef3a8aSmajianpeng 91279ef3a8aSmajianpeng if ((conf->start_next_window + NEXT_NORMALIO_DISTANCE) 9134f024f37SKent Overstreet <= bio->bi_iter.bi_sector) 91479ef3a8aSmajianpeng conf->next_window_requests++; 91579ef3a8aSmajianpeng else 91679ef3a8aSmajianpeng conf->current_window_requests++; 91779ef3a8aSmajianpeng sector = conf->start_next_window; 91817999be4SNeilBrown } 91941a336e0SNeilBrown } 92017999be4SNeilBrown 92179ef3a8aSmajianpeng conf->nr_pending++; 92279ef3a8aSmajianpeng spin_unlock_irq(&conf->resync_lock); 92379ef3a8aSmajianpeng return sector; 92479ef3a8aSmajianpeng } 92579ef3a8aSmajianpeng 92679ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 92779ef3a8aSmajianpeng sector_t bi_sector) 92817999be4SNeilBrown { 92917999be4SNeilBrown unsigned long flags; 93079ef3a8aSmajianpeng 93117999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 93217999be4SNeilBrown conf->nr_pending--; 93379ef3a8aSmajianpeng if (start_next_window) { 93479ef3a8aSmajianpeng if (start_next_window == conf->start_next_window) { 93579ef3a8aSmajianpeng if (conf->start_next_window + NEXT_NORMALIO_DISTANCE 93679ef3a8aSmajianpeng <= bi_sector) 93779ef3a8aSmajianpeng conf->next_window_requests--; 93879ef3a8aSmajianpeng else 93979ef3a8aSmajianpeng conf->current_window_requests--; 94079ef3a8aSmajianpeng } else 94179ef3a8aSmajianpeng conf->current_window_requests--; 94279ef3a8aSmajianpeng 94379ef3a8aSmajianpeng if (!conf->current_window_requests) { 94479ef3a8aSmajianpeng if (conf->next_window_requests) { 94579ef3a8aSmajianpeng conf->current_window_requests = 94679ef3a8aSmajianpeng conf->next_window_requests; 94779ef3a8aSmajianpeng conf->next_window_requests = 0; 94879ef3a8aSmajianpeng conf->start_next_window += 94979ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 95079ef3a8aSmajianpeng } else 95179ef3a8aSmajianpeng conf->start_next_window = MaxSector; 95279ef3a8aSmajianpeng } 95379ef3a8aSmajianpeng } 95417999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 95517999be4SNeilBrown wake_up(&conf->wait_barrier); 95617999be4SNeilBrown } 95717999be4SNeilBrown 958e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 959ddaf22abSNeilBrown { 960ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 961ddaf22abSNeilBrown * go quite. 962b364e3d0Smajianpeng * We wait until nr_pending match nr_queued+extra 9631c830532SNeilBrown * This is called in the context of one normal IO request 9641c830532SNeilBrown * that has failed. Thus any sync request that might be pending 9651c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 9661c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 967e2d59925SNeilBrown * Thus the number queued (nr_queued) plus this request (extra) 9681c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 9691c830532SNeilBrown * we continue. 970ddaf22abSNeilBrown */ 971ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 972b364e3d0Smajianpeng conf->array_frozen = 1; 973578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 974eed8c02eSLukas Czerner wait_event_lock_irq_cmd(conf->wait_barrier, 975e2d59925SNeilBrown conf->nr_pending == conf->nr_queued+extra, 976ddaf22abSNeilBrown conf->resync_lock, 977c3b328acSNeilBrown flush_pending_writes(conf)); 978ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 979ddaf22abSNeilBrown } 980e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 981ddaf22abSNeilBrown { 982ddaf22abSNeilBrown /* reverse the effect of the freeze */ 983ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 984b364e3d0Smajianpeng conf->array_frozen = 0; 985ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 986ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 987ddaf22abSNeilBrown } 988ddaf22abSNeilBrown 9894e78064fSNeilBrown /* duplicate the data pages for behind I/O 9904e78064fSNeilBrown */ 9919f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 9924b6d287fSNeilBrown { 9934b6d287fSNeilBrown int i; 9944b6d287fSNeilBrown struct bio_vec *bvec; 9952ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 9964b6d287fSNeilBrown GFP_NOIO); 9972ca68f5eSNeilBrown if (unlikely(!bvecs)) 998af6d7b76SNeilBrown return; 9994b6d287fSNeilBrown 1000cb34e057SKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 10012ca68f5eSNeilBrown bvecs[i] = *bvec; 10022ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 10032ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 10044b6d287fSNeilBrown goto do_sync_io; 10052ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 10064b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 10072ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 10084b6d287fSNeilBrown kunmap(bvec->bv_page); 10094b6d287fSNeilBrown } 10102ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 1011af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 1012af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 1013af6d7b76SNeilBrown return; 10144b6d287fSNeilBrown 10154b6d287fSNeilBrown do_sync_io: 1016af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 10172ca68f5eSNeilBrown if (bvecs[i].bv_page) 10182ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 10192ca68f5eSNeilBrown kfree(bvecs); 10204f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 10214f024f37SKent Overstreet bio->bi_iter.bi_size); 10224b6d287fSNeilBrown } 10234b6d287fSNeilBrown 1024f54a9d0eSNeilBrown struct raid1_plug_cb { 1025f54a9d0eSNeilBrown struct blk_plug_cb cb; 1026f54a9d0eSNeilBrown struct bio_list pending; 1027f54a9d0eSNeilBrown int pending_cnt; 1028f54a9d0eSNeilBrown }; 1029f54a9d0eSNeilBrown 1030f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1031f54a9d0eSNeilBrown { 1032f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1033f54a9d0eSNeilBrown cb); 1034f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1035f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1036f54a9d0eSNeilBrown struct bio *bio; 1037f54a9d0eSNeilBrown 1038874807a8SNeilBrown if (from_schedule || current->bio_list) { 1039f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1040f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1041f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1042f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1043ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1044f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1045f54a9d0eSNeilBrown kfree(plug); 1046f54a9d0eSNeilBrown return; 1047f54a9d0eSNeilBrown } 1048f54a9d0eSNeilBrown 1049f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1050f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1051f54a9d0eSNeilBrown bitmap_unplug(mddev->bitmap); 1052f54a9d0eSNeilBrown wake_up(&conf->wait_barrier); 1053f54a9d0eSNeilBrown 1054f54a9d0eSNeilBrown while (bio) { /* submit pending writes */ 1055f54a9d0eSNeilBrown struct bio *next = bio->bi_next; 10565e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 1057f54a9d0eSNeilBrown bio->bi_next = NULL; 10585e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 10595e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 10605e2c7a36SNeilBrown bio->bi_error = -EIO; 10615e2c7a36SNeilBrown bio_endio(bio); 10625e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 106332f9f570SShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 106432f9f570SShaohua Li /* Just ignore it */ 10654246a0b6SChristoph Hellwig bio_endio(bio); 106632f9f570SShaohua Li else 1067f54a9d0eSNeilBrown generic_make_request(bio); 1068f54a9d0eSNeilBrown bio = next; 1069f54a9d0eSNeilBrown } 1070f54a9d0eSNeilBrown kfree(plug); 1071f54a9d0eSNeilBrown } 1072f54a9d0eSNeilBrown 10733b046a97SRobert LeBlanc static void raid1_read_request(struct mddev *mddev, struct bio *bio, 10743b046a97SRobert LeBlanc struct r1bio *r1_bio) 10751da177e4SLinus Torvalds { 1076e8096360SNeilBrown struct r1conf *conf = mddev->private; 10770eaf822cSJonathan Brassow struct raid1_info *mirror; 10781da177e4SLinus Torvalds struct bio *read_bio; 10793b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1080796a5cf0SMike Christie const int op = bio_op(bio); 10811eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 10821f68f0c4SNeilBrown int sectors_handled; 10831f68f0c4SNeilBrown int max_sectors; 1084d2eb35acSNeilBrown int rdisk; 1085d2eb35acSNeilBrown 10863b046a97SRobert LeBlanc wait_barrier(conf, bio); 10873b046a97SRobert LeBlanc 1088d2eb35acSNeilBrown read_again: 1089d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds if (rdisk < 0) { 10921da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 10931da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 10945a7bbad2SChristoph Hellwig return; 10951da177e4SLinus Torvalds } 10961da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 10971da177e4SLinus Torvalds 1098e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1099e555190dSNeilBrown bitmap) { 11003b046a97SRobert LeBlanc /* 11013b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 11023b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1103e555190dSNeilBrown */ 1104578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1105e555190dSNeilBrown wait_event(bitmap->behind_wait, 1106e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1107e555190dSNeilBrown } 11081da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 1109f0cc9a05SNeilBrown r1_bio->start_next_window = 0; 11101da177e4SLinus Torvalds 1111a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 11124f024f37SKent Overstreet bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, 1113d2eb35acSNeilBrown max_sectors); 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 11161da177e4SLinus Torvalds 11174f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 11184f024f37SKent Overstreet mirror->rdev->data_offset; 11191da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 11201da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1121796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 11222e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 11232e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 11242e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 11251da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 11261da177e4SLinus Torvalds 1127109e3765SNeilBrown if (mddev->gendisk) 1128109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), 1129109e3765SNeilBrown read_bio, disk_devt(mddev->gendisk), 1130109e3765SNeilBrown r1_bio->sector); 1131109e3765SNeilBrown 1132d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 11333b046a97SRobert LeBlanc /* 11343b046a97SRobert LeBlanc * could not read all from this device, so we will need another 11353b046a97SRobert LeBlanc * r1_bio. 1136d2eb35acSNeilBrown */ 1137d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 11384f024f37SKent Overstreet - bio->bi_iter.bi_sector); 1139d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 1140d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 1141d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 1142d2eb35acSNeilBrown bio->bi_phys_segments = 2; 1143d2eb35acSNeilBrown else 1144d2eb35acSNeilBrown bio->bi_phys_segments++; 1145d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 11463b046a97SRobert LeBlanc 11473b046a97SRobert LeBlanc /* 11483b046a97SRobert LeBlanc * Cannot call generic_make_request directly as that will be 11493b046a97SRobert LeBlanc * queued in __make_request and subsequent mempool_alloc might 11503b046a97SRobert LeBlanc * block waiting for it. So hand bio over to raid1d. 1151d2eb35acSNeilBrown */ 1152d2eb35acSNeilBrown reschedule_retry(r1_bio); 1153d2eb35acSNeilBrown 1154d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1155d2eb35acSNeilBrown 1156d2eb35acSNeilBrown r1_bio->master_bio = bio; 1157aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 1158d2eb35acSNeilBrown r1_bio->state = 0; 1159d2eb35acSNeilBrown r1_bio->mddev = mddev; 11603b046a97SRobert LeBlanc r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 1161d2eb35acSNeilBrown goto read_again; 1162d2eb35acSNeilBrown } else 11631da177e4SLinus Torvalds generic_make_request(read_bio); 11641da177e4SLinus Torvalds } 11651da177e4SLinus Torvalds 11663b046a97SRobert LeBlanc static void raid1_write_request(struct mddev *mddev, struct bio *bio, 11673b046a97SRobert LeBlanc struct r1bio *r1_bio) 11683b046a97SRobert LeBlanc { 11693b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 11703b046a97SRobert LeBlanc int i, disks; 11713b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 11723b046a97SRobert LeBlanc unsigned long flags; 11733b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 11743b046a97SRobert LeBlanc struct blk_plug_cb *cb; 11753b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 11763b046a97SRobert LeBlanc int first_clone; 11773b046a97SRobert LeBlanc int sectors_handled; 11783b046a97SRobert LeBlanc int max_sectors; 11793b046a97SRobert LeBlanc sector_t start_next_window; 11803b046a97SRobert LeBlanc 11811da177e4SLinus Torvalds /* 11823b046a97SRobert LeBlanc * Register the new request and wait if the reconstruction 11833b046a97SRobert LeBlanc * thread has put up a bar for new requests. 11843b046a97SRobert LeBlanc * Continue immediately if no resync is active currently. 11851da177e4SLinus Torvalds */ 11863b046a97SRobert LeBlanc 11873b046a97SRobert LeBlanc md_write_start(mddev, bio); /* wait on superblock update early */ 11883b046a97SRobert LeBlanc 11893b046a97SRobert LeBlanc if ((bio_end_sector(bio) > mddev->suspend_lo && 11903b046a97SRobert LeBlanc bio->bi_iter.bi_sector < mddev->suspend_hi) || 11913b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 11923b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 11933b046a97SRobert LeBlanc bio->bi_iter.bi_sector, bio_end_sector(bio)))) { 11943b046a97SRobert LeBlanc 11953b046a97SRobert LeBlanc /* 11963b046a97SRobert LeBlanc * As the suspend_* range is controlled by userspace, we want 11973b046a97SRobert LeBlanc * an interruptible wait. 11983b046a97SRobert LeBlanc */ 11993b046a97SRobert LeBlanc DEFINE_WAIT(w); 12003b046a97SRobert LeBlanc for (;;) { 12013b046a97SRobert LeBlanc flush_signals(current); 12023b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 12033b046a97SRobert LeBlanc &w, TASK_INTERRUPTIBLE); 12043b046a97SRobert LeBlanc if (bio_end_sector(bio) <= mddev->suspend_lo || 12053b046a97SRobert LeBlanc bio->bi_iter.bi_sector >= mddev->suspend_hi || 12063b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 12073b046a97SRobert LeBlanc !md_cluster_ops->area_resyncing(mddev, WRITE, 12083b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 12093b046a97SRobert LeBlanc bio_end_sector(bio)))) 12103b046a97SRobert LeBlanc break; 12113b046a97SRobert LeBlanc schedule(); 12123b046a97SRobert LeBlanc } 12133b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 12143b046a97SRobert LeBlanc } 12153b046a97SRobert LeBlanc start_next_window = wait_barrier(conf, bio); 12163b046a97SRobert LeBlanc 121734db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 121834db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1219578b54adSNeilBrown raid1_log(mddev, "wait queued"); 122034db0cd6SNeilBrown wait_event(conf->wait_barrier, 122134db0cd6SNeilBrown conf->pending_count < max_queued_requests); 122234db0cd6SNeilBrown } 12231f68f0c4SNeilBrown /* first select target devices under rcu_lock and 12241da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 12251da177e4SLinus Torvalds * bios[x] to bio 12261f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 12271f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 12281f68f0c4SNeilBrown * blocks. 12291f68f0c4SNeilBrown * This potentially requires several writes to write around 12301f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 12311f68f0c4SNeilBrown * with a set of bios attached. 12321da177e4SLinus Torvalds */ 1233c3b328acSNeilBrown 12348f19ccb2SNeilBrown disks = conf->raid_disks * 2; 12356bfe0b49SDan Williams retry_write: 123679ef3a8aSmajianpeng r1_bio->start_next_window = start_next_window; 12376bfe0b49SDan Williams blocked_rdev = NULL; 12381da177e4SLinus Torvalds rcu_read_lock(); 12391f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 12401da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 12413cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 12426bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 12436bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 12446bfe0b49SDan Williams blocked_rdev = rdev; 12456bfe0b49SDan Williams break; 12466bfe0b49SDan Williams } 12471da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 12488ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 12498f19ccb2SNeilBrown if (i < conf->raid_disks) 12501f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 12511f68f0c4SNeilBrown continue; 1252964147d5SNeilBrown } 12531f68f0c4SNeilBrown 12541f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 12551f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 12561f68f0c4SNeilBrown sector_t first_bad; 12571f68f0c4SNeilBrown int bad_sectors; 12581f68f0c4SNeilBrown int is_bad; 12591f68f0c4SNeilBrown 12603b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 12611f68f0c4SNeilBrown &first_bad, &bad_sectors); 12621f68f0c4SNeilBrown if (is_bad < 0) { 12631f68f0c4SNeilBrown /* mustn't write here until the bad block is 12641f68f0c4SNeilBrown * acknowledged*/ 12651f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 12661f68f0c4SNeilBrown blocked_rdev = rdev; 12671f68f0c4SNeilBrown break; 12681f68f0c4SNeilBrown } 12691f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 12701f68f0c4SNeilBrown /* Cannot write here at all */ 12711f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 12721f68f0c4SNeilBrown if (bad_sectors < max_sectors) 12731f68f0c4SNeilBrown /* mustn't write more than bad_sectors 12741f68f0c4SNeilBrown * to other devices yet 12751f68f0c4SNeilBrown */ 12761f68f0c4SNeilBrown max_sectors = bad_sectors; 12771f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 12781f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 12791f68f0c4SNeilBrown * only applies if the disk is 12801f68f0c4SNeilBrown * missing, so it might be re-added, 12811f68f0c4SNeilBrown * and we want to know to recover this 12821f68f0c4SNeilBrown * chunk. 12831f68f0c4SNeilBrown * In this case the device is here, 12841f68f0c4SNeilBrown * and the fact that this chunk is not 12851f68f0c4SNeilBrown * in-sync is recorded in the bad 12861f68f0c4SNeilBrown * block log 12871f68f0c4SNeilBrown */ 12881f68f0c4SNeilBrown continue; 12891f68f0c4SNeilBrown } 12901f68f0c4SNeilBrown if (is_bad) { 12911f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 12921f68f0c4SNeilBrown if (good_sectors < max_sectors) 12931f68f0c4SNeilBrown max_sectors = good_sectors; 12941f68f0c4SNeilBrown } 12951f68f0c4SNeilBrown } 12961f68f0c4SNeilBrown r1_bio->bios[i] = bio; 12971da177e4SLinus Torvalds } 12981da177e4SLinus Torvalds rcu_read_unlock(); 12991da177e4SLinus Torvalds 13006bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 13016bfe0b49SDan Williams /* Wait for this device to become unblocked */ 13026bfe0b49SDan Williams int j; 130379ef3a8aSmajianpeng sector_t old = start_next_window; 13046bfe0b49SDan Williams 13056bfe0b49SDan Williams for (j = 0; j < i; j++) 13066bfe0b49SDan Williams if (r1_bio->bios[j]) 13076bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 13081f68f0c4SNeilBrown r1_bio->state = 0; 13094f024f37SKent Overstreet allow_barrier(conf, start_next_window, bio->bi_iter.bi_sector); 1310578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 13116bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 131279ef3a8aSmajianpeng start_next_window = wait_barrier(conf, bio); 131379ef3a8aSmajianpeng /* 131479ef3a8aSmajianpeng * We must make sure the multi r1bios of bio have 131579ef3a8aSmajianpeng * the same value of bi_phys_segments 131679ef3a8aSmajianpeng */ 131779ef3a8aSmajianpeng if (bio->bi_phys_segments && old && 131879ef3a8aSmajianpeng old != start_next_window) 131979ef3a8aSmajianpeng /* Wait for the former r1bio(s) to complete */ 132079ef3a8aSmajianpeng wait_event(conf->wait_barrier, 132179ef3a8aSmajianpeng bio->bi_phys_segments == 1); 13226bfe0b49SDan Williams goto retry_write; 13236bfe0b49SDan Williams } 13246bfe0b49SDan Williams 13251f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 13261f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 13271f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 13281f68f0c4SNeilBrown */ 13291f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 13301f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 13311f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 13321f68f0c4SNeilBrown bio->bi_phys_segments = 2; 13331f68f0c4SNeilBrown else 13341f68f0c4SNeilBrown bio->bi_phys_segments++; 13351f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1336191ea9b2SNeilBrown } 13374f024f37SKent Overstreet sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; 13384b6d287fSNeilBrown 13394e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 13404b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1341191ea9b2SNeilBrown 13421f68f0c4SNeilBrown first_clone = 1; 13431da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13441da177e4SLinus Torvalds struct bio *mbio; 13451da177e4SLinus Torvalds if (!r1_bio->bios[i]) 13461da177e4SLinus Torvalds continue; 13471da177e4SLinus Torvalds 1348a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 13493b046a97SRobert LeBlanc bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector, 13503b046a97SRobert LeBlanc max_sectors); 13511da177e4SLinus Torvalds 13521f68f0c4SNeilBrown if (first_clone) { 13531f68f0c4SNeilBrown /* do behind I/O ? 13541f68f0c4SNeilBrown * Not if there are too many, or cannot 13551f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 13561f68f0c4SNeilBrown * is waiting for behind writes to flush */ 13571f68f0c4SNeilBrown if (bitmap && 13581f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 13591f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 13601f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 13611f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 13621da177e4SLinus Torvalds 13631f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 13641f68f0c4SNeilBrown r1_bio->sectors, 13651f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 13661f68f0c4SNeilBrown &r1_bio->state)); 13671f68f0c4SNeilBrown first_clone = 0; 13681f68f0c4SNeilBrown } 13692ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 13704b6d287fSNeilBrown struct bio_vec *bvec; 13714b6d287fSNeilBrown int j; 13724b6d287fSNeilBrown 1373cb34e057SKent Overstreet /* 1374cb34e057SKent Overstreet * We trimmed the bio, so _all is legit 13754b6d287fSNeilBrown */ 1376d74c6d51SKent Overstreet bio_for_each_segment_all(bvec, mbio, j) 13772ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 13784b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 13794b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 13804b6d287fSNeilBrown } 13814b6d287fSNeilBrown 13821f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 13831f68f0c4SNeilBrown 13844f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 13851f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 1386109e3765SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 13871f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1388309bd96aSChristoph Hellwig mbio->bi_opf = bio_op(bio) | 1389309bd96aSChristoph Hellwig (bio->bi_opf & (REQ_SYNC | REQ_PREFLUSH | REQ_FUA)); 1390212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1391212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1392212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1393212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 13941f68f0c4SNeilBrown mbio->bi_private = r1_bio; 13951f68f0c4SNeilBrown 13961da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1397f54a9d0eSNeilBrown 1398109e3765SNeilBrown if (mddev->gendisk) 1399109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), 1400109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1401109e3765SNeilBrown r1_bio->sector); 1402109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1403109e3765SNeilBrown mbio->bi_bdev = (void*)conf->mirrors[i].rdev; 1404109e3765SNeilBrown 1405f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1406f54a9d0eSNeilBrown if (cb) 1407f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1408f54a9d0eSNeilBrown else 1409f54a9d0eSNeilBrown plug = NULL; 1410191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1411f54a9d0eSNeilBrown if (plug) { 1412f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1413f54a9d0eSNeilBrown plug->pending_cnt++; 1414f54a9d0eSNeilBrown } else { 14154e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 141634db0cd6SNeilBrown conf->pending_count++; 1417f54a9d0eSNeilBrown } 1418191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1419f54a9d0eSNeilBrown if (!plug) 1420b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 14214e78064fSNeilBrown } 1422079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1423079fa166SNeilBrown * as it could result in the bio being freed. 1424079fa166SNeilBrown */ 1425aa8b57aaSKent Overstreet if (sectors_handled < bio_sectors(bio)) { 1426079fa166SNeilBrown r1_bio_write_done(r1_bio); 14271f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 14281f68f0c4SNeilBrown * in bio->bi_phys_segments 14291f68f0c4SNeilBrown */ 14301f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 14311f68f0c4SNeilBrown r1_bio->master_bio = bio; 1432aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 14331f68f0c4SNeilBrown r1_bio->state = 0; 14341f68f0c4SNeilBrown r1_bio->mddev = mddev; 14354f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 14361f68f0c4SNeilBrown goto retry_write; 14371f68f0c4SNeilBrown } 14381f68f0c4SNeilBrown 1439079fa166SNeilBrown r1_bio_write_done(r1_bio); 1440079fa166SNeilBrown 1441079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1442079fa166SNeilBrown wake_up(&conf->wait_barrier); 14431da177e4SLinus Torvalds } 14441da177e4SLinus Torvalds 14453b046a97SRobert LeBlanc static void raid1_make_request(struct mddev *mddev, struct bio *bio) 14463b046a97SRobert LeBlanc { 14473b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 14483b046a97SRobert LeBlanc struct r1bio *r1_bio; 14493b046a97SRobert LeBlanc 14503b046a97SRobert LeBlanc /* 14513b046a97SRobert LeBlanc * make_request() can abort the operation when read-ahead is being 14523b046a97SRobert LeBlanc * used and no empty request is available. 14533b046a97SRobert LeBlanc * 14543b046a97SRobert LeBlanc */ 14553b046a97SRobert LeBlanc r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 14563b046a97SRobert LeBlanc 14573b046a97SRobert LeBlanc r1_bio->master_bio = bio; 14583b046a97SRobert LeBlanc r1_bio->sectors = bio_sectors(bio); 14593b046a97SRobert LeBlanc r1_bio->state = 0; 14603b046a97SRobert LeBlanc r1_bio->mddev = mddev; 14613b046a97SRobert LeBlanc r1_bio->sector = bio->bi_iter.bi_sector; 14623b046a97SRobert LeBlanc 14633b046a97SRobert LeBlanc /* 14643b046a97SRobert LeBlanc * We might need to issue multiple reads to different devices if there 14653b046a97SRobert LeBlanc * are bad blocks around, so we keep track of the number of reads in 14663b046a97SRobert LeBlanc * bio->bi_phys_segments. If this is 0, there is only one r1_bio and 14673b046a97SRobert LeBlanc * no locking will be needed when requests complete. If it is 14683b046a97SRobert LeBlanc * non-zero, then it is the number of not-completed requests. 14693b046a97SRobert LeBlanc */ 14703b046a97SRobert LeBlanc bio->bi_phys_segments = 0; 14713b046a97SRobert LeBlanc bio_clear_flag(bio, BIO_SEG_VALID); 14723b046a97SRobert LeBlanc 14733b046a97SRobert LeBlanc if (bio_data_dir(bio) == READ) 14743b046a97SRobert LeBlanc raid1_read_request(mddev, bio, r1_bio); 14753b046a97SRobert LeBlanc else 14763b046a97SRobert LeBlanc raid1_write_request(mddev, bio, r1_bio); 14773b046a97SRobert LeBlanc } 14783b046a97SRobert LeBlanc 1479849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 14801da177e4SLinus Torvalds { 1481e8096360SNeilBrown struct r1conf *conf = mddev->private; 14821da177e4SLinus Torvalds int i; 14831da177e4SLinus Torvalds 14841da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 148511ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1486ddac7c7eSNeilBrown rcu_read_lock(); 1487ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 14883cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 14891da177e4SLinus Torvalds seq_printf(seq, "%s", 1490ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1491ddac7c7eSNeilBrown } 1492ddac7c7eSNeilBrown rcu_read_unlock(); 14931da177e4SLinus Torvalds seq_printf(seq, "]"); 14941da177e4SLinus Torvalds } 14951da177e4SLinus Torvalds 1496849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 14971da177e4SLinus Torvalds { 14981da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1499e8096360SNeilBrown struct r1conf *conf = mddev->private; 1500423f04d6SNeilBrown unsigned long flags; 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds /* 15031da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 15041da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 15051da177e4SLinus Torvalds * next level up know. 15061da177e4SLinus Torvalds * else mark the drive as failed 15071da177e4SLinus Torvalds */ 15082e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1509b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 15104044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 15111da177e4SLinus Torvalds /* 15121da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 15134044ba58SNeilBrown * normal single drive. 15144044ba58SNeilBrown * However don't try a recovery from this drive as 15154044ba58SNeilBrown * it is very likely to fail. 15161da177e4SLinus Torvalds */ 15175389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 15182e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 15191da177e4SLinus Torvalds return; 15204044ba58SNeilBrown } 1521de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1522423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 15231da177e4SLinus Torvalds mddev->degraded++; 1524dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 15252446dba0SNeilBrown } else 15262446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1527423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 15281da177e4SLinus Torvalds /* 15291da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 15301da177e4SLinus Torvalds */ 1531dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 15322953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 15332953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 15341d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1535067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 15369dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 15379dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 15381da177e4SLinus Torvalds } 15391da177e4SLinus Torvalds 1540e8096360SNeilBrown static void print_conf(struct r1conf *conf) 15411da177e4SLinus Torvalds { 15421da177e4SLinus Torvalds int i; 15431da177e4SLinus Torvalds 15441d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 15451da177e4SLinus Torvalds if (!conf) { 15461d41c216SNeilBrown pr_debug("(!conf)\n"); 15471da177e4SLinus Torvalds return; 15481da177e4SLinus Torvalds } 15491d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 15501da177e4SLinus Torvalds conf->raid_disks); 15511da177e4SLinus Torvalds 1552ddac7c7eSNeilBrown rcu_read_lock(); 15531da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15541da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 15553cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1556ddac7c7eSNeilBrown if (rdev) 15571d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1558ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1559ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1560ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 15611da177e4SLinus Torvalds } 1562ddac7c7eSNeilBrown rcu_read_unlock(); 15631da177e4SLinus Torvalds } 15641da177e4SLinus Torvalds 1565e8096360SNeilBrown static void close_sync(struct r1conf *conf) 15661da177e4SLinus Torvalds { 156779ef3a8aSmajianpeng wait_barrier(conf, NULL); 156879ef3a8aSmajianpeng allow_barrier(conf, 0, 0); 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 15711da177e4SLinus Torvalds conf->r1buf_pool = NULL; 157279ef3a8aSmajianpeng 1573669cc7baSNeilBrown spin_lock_irq(&conf->resync_lock); 1574e8ff8bf0SJes Sorensen conf->next_resync = MaxSector - 2 * NEXT_NORMALIO_DISTANCE; 157579ef3a8aSmajianpeng conf->start_next_window = MaxSector; 1576669cc7baSNeilBrown conf->current_window_requests += 1577669cc7baSNeilBrown conf->next_window_requests; 1578669cc7baSNeilBrown conf->next_window_requests = 0; 1579669cc7baSNeilBrown spin_unlock_irq(&conf->resync_lock); 15801da177e4SLinus Torvalds } 15811da177e4SLinus Torvalds 1582fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 15831da177e4SLinus Torvalds { 15841da177e4SLinus Torvalds int i; 1585e8096360SNeilBrown struct r1conf *conf = mddev->private; 15866b965620SNeilBrown int count = 0; 15876b965620SNeilBrown unsigned long flags; 15881da177e4SLinus Torvalds 15891da177e4SLinus Torvalds /* 15901da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1591ddac7c7eSNeilBrown * and mark them readable. 1592ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1593423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1594423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 15951da177e4SLinus Torvalds */ 1596423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 15971da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15983cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 15998c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 16008c7a2c2bSNeilBrown if (repl 16011aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 16028c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 16038c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 16048c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 16058c7a2c2bSNeilBrown /* replacement has just become active */ 16068c7a2c2bSNeilBrown if (!rdev || 16078c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 16088c7a2c2bSNeilBrown count++; 16098c7a2c2bSNeilBrown if (rdev) { 16108c7a2c2bSNeilBrown /* Replaced device not technically 16118c7a2c2bSNeilBrown * faulty, but we need to be sure 16128c7a2c2bSNeilBrown * it gets removed and never re-added 16138c7a2c2bSNeilBrown */ 16148c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 16158c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 16168c7a2c2bSNeilBrown rdev->sysfs_state); 16178c7a2c2bSNeilBrown } 16188c7a2c2bSNeilBrown } 1619ddac7c7eSNeilBrown if (rdev 162061e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1621ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1622c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 16236b965620SNeilBrown count++; 1624654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds } 16276b965620SNeilBrown mddev->degraded -= count; 16286b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds print_conf(conf); 16316b965620SNeilBrown return count; 16321da177e4SLinus Torvalds } 16331da177e4SLinus Torvalds 1634fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 16351da177e4SLinus Torvalds { 1636e8096360SNeilBrown struct r1conf *conf = mddev->private; 1637199050eaSNeil Brown int err = -EEXIST; 163841158c7eSNeilBrown int mirror = 0; 16390eaf822cSJonathan Brassow struct raid1_info *p; 16406c2fce2eSNeil Brown int first = 0; 164130194636SNeilBrown int last = conf->raid_disks - 1; 16421da177e4SLinus Torvalds 16435389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 16445389042fSNeilBrown return -EBUSY; 16455389042fSNeilBrown 16461501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 16471501efadSDan Williams return -ENXIO; 16481501efadSDan Williams 16496c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 16506c2fce2eSNeil Brown first = last = rdev->raid_disk; 16516c2fce2eSNeil Brown 165270bcecdbSGoldwyn Rodrigues /* 165370bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 165470bcecdbSGoldwyn Rodrigues * if possible. 165570bcecdbSGoldwyn Rodrigues */ 165670bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 165770bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 165870bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 165970bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 166070bcecdbSGoldwyn Rodrigues 16617ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 16627ef449d1SNeilBrown p = conf->mirrors+mirror; 16637ef449d1SNeilBrown if (!p->rdev) { 16641da177e4SLinus Torvalds 16659092c02dSJonathan Brassow if (mddev->gendisk) 16668f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 16678f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 16681da177e4SLinus Torvalds 16691da177e4SLinus Torvalds p->head_position = 0; 16701da177e4SLinus Torvalds rdev->raid_disk = mirror; 1671199050eaSNeil Brown err = 0; 16726aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 16736aea114aSNeilBrown * if this was recently any drive of the array 16746aea114aSNeilBrown */ 16756aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 167641158c7eSNeilBrown conf->fullsync = 1; 1677d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 16781da177e4SLinus Torvalds break; 16791da177e4SLinus Torvalds } 16807ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 16817ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 16827ef449d1SNeilBrown /* Add this device as a replacement */ 16837ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 16847ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 16857ef449d1SNeilBrown rdev->raid_disk = mirror; 16867ef449d1SNeilBrown err = 0; 16877ef449d1SNeilBrown conf->fullsync = 1; 16887ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 16897ef449d1SNeilBrown break; 16907ef449d1SNeilBrown } 16917ef449d1SNeilBrown } 16929092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 16932ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 16941da177e4SLinus Torvalds print_conf(conf); 1695199050eaSNeil Brown return err; 16961da177e4SLinus Torvalds } 16971da177e4SLinus Torvalds 1698b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 16991da177e4SLinus Torvalds { 1700e8096360SNeilBrown struct r1conf *conf = mddev->private; 17011da177e4SLinus Torvalds int err = 0; 1702b8321b68SNeilBrown int number = rdev->raid_disk; 17030eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 17041da177e4SLinus Torvalds 1705b014f14cSNeilBrown if (rdev != p->rdev) 1706b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1707b014f14cSNeilBrown 17081da177e4SLinus Torvalds print_conf(conf); 1709b8321b68SNeilBrown if (rdev == p->rdev) { 1710b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 17111da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 17121da177e4SLinus Torvalds err = -EBUSY; 17131da177e4SLinus Torvalds goto abort; 17141da177e4SLinus Torvalds } 1715046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1716dfc70645SNeilBrown * is not possible. 1717dfc70645SNeilBrown */ 1718dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 17195389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1720dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1721dfc70645SNeilBrown err = -EBUSY; 1722dfc70645SNeilBrown goto abort; 1723dfc70645SNeilBrown } 17241da177e4SLinus Torvalds p->rdev = NULL; 1725d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1726fbd568a3SPaul E. McKenney synchronize_rcu(); 17271da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 17281da177e4SLinus Torvalds /* lost the race, try later */ 17291da177e4SLinus Torvalds err = -EBUSY; 17301da177e4SLinus Torvalds p->rdev = rdev; 1731ac5e7113SAndre Noll goto abort; 1732d787be40SNeilBrown } 1733d787be40SNeilBrown } 1734d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 17358c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 17368c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 17378c7a2c2bSNeilBrown * doing this to avoid confusion. 17388c7a2c2bSNeilBrown */ 17398c7a2c2bSNeilBrown struct md_rdev *repl = 17408c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1741e2d59925SNeilBrown freeze_array(conf, 0); 17428c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 17438c7a2c2bSNeilBrown p->rdev = repl; 17448c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1745e2d59925SNeilBrown unfreeze_array(conf); 1746b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 17478c7a2c2bSNeilBrown } else 17488c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1749a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 17501da177e4SLinus Torvalds } 17511da177e4SLinus Torvalds abort: 17521da177e4SLinus Torvalds 17531da177e4SLinus Torvalds print_conf(conf); 17541da177e4SLinus Torvalds return err; 17551da177e4SLinus Torvalds } 17561da177e4SLinus Torvalds 17574246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 17581da177e4SLinus Torvalds { 17599f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 17601da177e4SLinus Torvalds 17610fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1762ba3ae3beSNamhyung Kim 17631da177e4SLinus Torvalds /* 17641da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 17651da177e4SLinus Torvalds * or re-read if the read failed. 17661da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 17671da177e4SLinus Torvalds */ 17684246a0b6SChristoph Hellwig if (!bio->bi_error) 17691da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1770d11c171eSNeilBrown 1771d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 17721da177e4SLinus Torvalds reschedule_retry(r1_bio); 17731da177e4SLinus Torvalds } 17741da177e4SLinus Torvalds 17754246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 17761da177e4SLinus Torvalds { 17774246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 17789f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1779fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1780e8096360SNeilBrown struct r1conf *conf = mddev->private; 17814367af55SNeilBrown sector_t first_bad; 17824367af55SNeilBrown int bad_sectors; 1783854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1784ba3ae3beSNamhyung Kim 17856b1117d5SNeilBrown if (!uptodate) { 178657dab0bdSNeilBrown sector_t sync_blocks = 0; 17876b1117d5SNeilBrown sector_t s = r1_bio->sector; 17886b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 17896b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 17906b1117d5SNeilBrown do { 17915e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 17926b1117d5SNeilBrown &sync_blocks, 1); 17936b1117d5SNeilBrown s += sync_blocks; 17946b1117d5SNeilBrown sectors_to_go -= sync_blocks; 17956b1117d5SNeilBrown } while (sectors_to_go > 0); 1796854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1797854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 179819d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 179919d67169SNeilBrown mddev->recovery); 1800d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1801854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 18023a9f28a5SNeilBrown &first_bad, &bad_sectors) && 18033a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 18043a9f28a5SNeilBrown r1_bio->sector, 18053a9f28a5SNeilBrown r1_bio->sectors, 18063a9f28a5SNeilBrown &first_bad, &bad_sectors) 18073a9f28a5SNeilBrown ) 18084367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1809e3b9703eSNeilBrown 18101da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 18114367af55SNeilBrown int s = r1_bio->sectors; 1812d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1813d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 18144367af55SNeilBrown reschedule_retry(r1_bio); 18154367af55SNeilBrown else { 18161da177e4SLinus Torvalds put_buf(r1_bio); 181773d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 18181da177e4SLinus Torvalds } 18191da177e4SLinus Torvalds } 18204367af55SNeilBrown } 18211da177e4SLinus Torvalds 18223cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1823d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1824d8f05d29SNeilBrown { 1825796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1826d8f05d29SNeilBrown /* success */ 1827d8f05d29SNeilBrown return 1; 182819d67169SNeilBrown if (rw == WRITE) { 1829d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 183019d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 183119d67169SNeilBrown &rdev->flags)) 183219d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 183319d67169SNeilBrown rdev->mddev->recovery); 183419d67169SNeilBrown } 1835d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1836d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1837d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1838d8f05d29SNeilBrown return 0; 1839d8f05d29SNeilBrown } 1840d8f05d29SNeilBrown 18419f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 18421da177e4SLinus Torvalds { 1843a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 184469382e85SNeilBrown * good data, much like with normal read errors. Only 1845ddac7c7eSNeilBrown * read into the pages we already have so we don't 184669382e85SNeilBrown * need to re-issue the read request. 184769382e85SNeilBrown * We don't need to freeze the array, because being in an 184869382e85SNeilBrown * active sync request, there is no normal IO, and 184969382e85SNeilBrown * no overlapping syncs. 185006f60385SNeilBrown * We don't need to check is_badblock() again as we 185106f60385SNeilBrown * made sure that anything with a bad block in range 185206f60385SNeilBrown * will have bi_end_io clear. 18531da177e4SLinus Torvalds */ 1854fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1855e8096360SNeilBrown struct r1conf *conf = mddev->private; 1856a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 185769382e85SNeilBrown sector_t sect = r1_bio->sector; 185869382e85SNeilBrown int sectors = r1_bio->sectors; 185969382e85SNeilBrown int idx = 0; 18602e52d449SNeilBrown struct md_rdev *rdev; 18612e52d449SNeilBrown 18622e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 18632e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 18642e52d449SNeilBrown /* Don't try recovering from here - just fail it 18652e52d449SNeilBrown * ... unless it is the last working device of course */ 18662e52d449SNeilBrown md_error(mddev, rdev); 18672e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 18682e52d449SNeilBrown /* Don't try to read from here, but make sure 18692e52d449SNeilBrown * put_buf does it's thing 18702e52d449SNeilBrown */ 18712e52d449SNeilBrown bio->bi_end_io = end_sync_write; 18722e52d449SNeilBrown } 187369382e85SNeilBrown 187469382e85SNeilBrown while(sectors) { 187569382e85SNeilBrown int s = sectors; 187669382e85SNeilBrown int d = r1_bio->read_disk; 187769382e85SNeilBrown int success = 0; 187878d7f5f7SNeilBrown int start; 187969382e85SNeilBrown 188069382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 188169382e85SNeilBrown s = PAGE_SIZE >> 9; 188269382e85SNeilBrown do { 188369382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1884ddac7c7eSNeilBrown /* No rcu protection needed here devices 1885ddac7c7eSNeilBrown * can only be removed when no resync is 1886ddac7c7eSNeilBrown * active, and resync is currently active 1887ddac7c7eSNeilBrown */ 188869382e85SNeilBrown rdev = conf->mirrors[d].rdev; 18899d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 189069382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1891796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 189269382e85SNeilBrown success = 1; 189369382e85SNeilBrown break; 189469382e85SNeilBrown } 189569382e85SNeilBrown } 189669382e85SNeilBrown d++; 18978f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 189869382e85SNeilBrown d = 0; 189969382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 190069382e85SNeilBrown 190178d7f5f7SNeilBrown if (!success) { 190278d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 19033a9f28a5SNeilBrown int abort = 0; 19043a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 19053a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 19063a9f28a5SNeilBrown * work just disable and interrupt the recovery. 19073a9f28a5SNeilBrown * Don't fail devices as that won't really help. 19083a9f28a5SNeilBrown */ 19091d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 191078d7f5f7SNeilBrown mdname(mddev), 191178d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 191278d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 19138f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 19143a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 19153a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 19163a9f28a5SNeilBrown continue; 19173a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 19183a9f28a5SNeilBrown abort = 1; 19193a9f28a5SNeilBrown } 19203a9f28a5SNeilBrown if (abort) { 1921d890fa2bSNeilBrown conf->recovery_disabled = 1922d890fa2bSNeilBrown mddev->recovery_disabled; 19233a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 192478d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 192578d7f5f7SNeilBrown put_buf(r1_bio); 192678d7f5f7SNeilBrown return 0; 192778d7f5f7SNeilBrown } 19283a9f28a5SNeilBrown /* Try next page */ 19293a9f28a5SNeilBrown sectors -= s; 19303a9f28a5SNeilBrown sect += s; 19313a9f28a5SNeilBrown idx++; 19323a9f28a5SNeilBrown continue; 19333a9f28a5SNeilBrown } 193478d7f5f7SNeilBrown 193578d7f5f7SNeilBrown start = d; 193669382e85SNeilBrown /* write it back and re-read */ 193769382e85SNeilBrown while (d != r1_bio->read_disk) { 193869382e85SNeilBrown if (d == 0) 19398f19ccb2SNeilBrown d = conf->raid_disks * 2; 194069382e85SNeilBrown d--; 194169382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 194269382e85SNeilBrown continue; 194369382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1944d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 194569382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1946d8f05d29SNeilBrown WRITE) == 0) { 194778d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 194878d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 19499d3d8011SNamhyung Kim } 1950097426f6SNeilBrown } 1951097426f6SNeilBrown d = start; 1952097426f6SNeilBrown while (d != r1_bio->read_disk) { 1953097426f6SNeilBrown if (d == 0) 19548f19ccb2SNeilBrown d = conf->raid_disks * 2; 1955097426f6SNeilBrown d--; 1956097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1957097426f6SNeilBrown continue; 1958097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1959d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 196069382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1961d8f05d29SNeilBrown READ) != 0) 19629d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 196369382e85SNeilBrown } 196469382e85SNeilBrown sectors -= s; 196569382e85SNeilBrown sect += s; 196669382e85SNeilBrown idx ++; 196769382e85SNeilBrown } 196878d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 19694246a0b6SChristoph Hellwig bio->bi_error = 0; 1970a68e5870SNeilBrown return 1; 197169382e85SNeilBrown } 1972d11c171eSNeilBrown 1973c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 1974a68e5870SNeilBrown { 1975a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1976a68e5870SNeilBrown * got the block, then there is no hope left. 1977a68e5870SNeilBrown * If we have, then we want to do a comparison 1978a68e5870SNeilBrown * and skip the write if everything is the same. 1979a68e5870SNeilBrown * If any blocks failed to read, then we need to 1980a68e5870SNeilBrown * attempt an over-write 1981a68e5870SNeilBrown */ 1982fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1983e8096360SNeilBrown struct r1conf *conf = mddev->private; 1984a68e5870SNeilBrown int primary; 1985a68e5870SNeilBrown int i; 1986f4380a91Smajianpeng int vcnt; 1987a68e5870SNeilBrown 198830bc9b53SNeilBrown /* Fix variable parts of all bios */ 198930bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 199030bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 199130bc9b53SNeilBrown int j; 199230bc9b53SNeilBrown int size; 19934246a0b6SChristoph Hellwig int error; 199430bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 199530bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 199630bc9b53SNeilBrown continue; 19974246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 19984246a0b6SChristoph Hellwig error = b->bi_error; 199930bc9b53SNeilBrown bio_reset(b); 20004246a0b6SChristoph Hellwig b->bi_error = error; 200130bc9b53SNeilBrown b->bi_vcnt = vcnt; 20024f024f37SKent Overstreet b->bi_iter.bi_size = r1_bio->sectors << 9; 20034f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 200430bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 200530bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 200630bc9b53SNeilBrown b->bi_end_io = end_sync_read; 200730bc9b53SNeilBrown b->bi_private = r1_bio; 200830bc9b53SNeilBrown 20094f024f37SKent Overstreet size = b->bi_iter.bi_size; 201030bc9b53SNeilBrown for (j = 0; j < vcnt ; j++) { 201130bc9b53SNeilBrown struct bio_vec *bi; 201230bc9b53SNeilBrown bi = &b->bi_io_vec[j]; 201330bc9b53SNeilBrown bi->bv_offset = 0; 201430bc9b53SNeilBrown if (size > PAGE_SIZE) 201530bc9b53SNeilBrown bi->bv_len = PAGE_SIZE; 201630bc9b53SNeilBrown else 201730bc9b53SNeilBrown bi->bv_len = size; 201830bc9b53SNeilBrown size -= PAGE_SIZE; 201930bc9b53SNeilBrown } 202030bc9b53SNeilBrown } 20218f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2022a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 20234246a0b6SChristoph Hellwig !r1_bio->bios[primary]->bi_error) { 2024a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2025a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2026a68e5870SNeilBrown break; 2027a68e5870SNeilBrown } 2028a68e5870SNeilBrown r1_bio->read_disk = primary; 20298f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2030a68e5870SNeilBrown int j; 2031a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2032a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 20334246a0b6SChristoph Hellwig int error = sbio->bi_error; 203478d7f5f7SNeilBrown 20352aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 203678d7f5f7SNeilBrown continue; 20374246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 20384246a0b6SChristoph Hellwig sbio->bi_error = 0; 2039a68e5870SNeilBrown 20404246a0b6SChristoph Hellwig if (!error) { 2041a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 2042a68e5870SNeilBrown struct page *p, *s; 2043a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 2044a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 2045a68e5870SNeilBrown if (memcmp(page_address(p), 2046a68e5870SNeilBrown page_address(s), 20475020ad7dSNeilBrown sbio->bi_io_vec[j].bv_len)) 2048a68e5870SNeilBrown break; 2049a68e5870SNeilBrown } 2050a68e5870SNeilBrown } else 2051a68e5870SNeilBrown j = 0; 2052a68e5870SNeilBrown if (j >= 0) 20537f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2054a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 20554246a0b6SChristoph Hellwig && !error)) { 205678d7f5f7SNeilBrown /* No need to write to this device. */ 2057a68e5870SNeilBrown sbio->bi_end_io = NULL; 2058a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 205978d7f5f7SNeilBrown continue; 206078d7f5f7SNeilBrown } 2061d3b45c2aSKent Overstreet 2062d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2063a68e5870SNeilBrown } 2064a68e5870SNeilBrown } 2065a68e5870SNeilBrown 20669f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2067a68e5870SNeilBrown { 2068e8096360SNeilBrown struct r1conf *conf = mddev->private; 2069a68e5870SNeilBrown int i; 20708f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2071a68e5870SNeilBrown struct bio *bio, *wbio; 2072a68e5870SNeilBrown 2073a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2074a68e5870SNeilBrown 2075a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2076a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2077a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2078a68e5870SNeilBrown return; 20797ca78d57SNeilBrown 20807ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2081c95e6385SNeilBrown process_checks(r1_bio); 2082c95e6385SNeilBrown 2083d11c171eSNeilBrown /* 2084d11c171eSNeilBrown * schedule writes 2085d11c171eSNeilBrown */ 20861da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 20871da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 20881da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 20893e198f78SNeilBrown if (wbio->bi_end_io == NULL || 20903e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 20913e198f78SNeilBrown (i == r1_bio->read_disk || 20923e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 20931da177e4SLinus Torvalds continue; 20941da177e4SLinus Torvalds 2095796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2096212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2097212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2098212e7eb7SNeilBrown 20993e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 21001da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2101aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2102191ea9b2SNeilBrown 21031da177e4SLinus Torvalds generic_make_request(wbio); 21041da177e4SLinus Torvalds } 21051da177e4SLinus Torvalds 21061da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2107191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 210858e94ae1SNeilBrown int s = r1_bio->sectors; 210958e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 211058e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 211158e94ae1SNeilBrown reschedule_retry(r1_bio); 211258e94ae1SNeilBrown else { 21131da177e4SLinus Torvalds put_buf(r1_bio); 211458e94ae1SNeilBrown md_done_sync(mddev, s, 1); 211558e94ae1SNeilBrown } 21161da177e4SLinus Torvalds } 21171da177e4SLinus Torvalds } 21181da177e4SLinus Torvalds 21191da177e4SLinus Torvalds /* 21201da177e4SLinus Torvalds * This is a kernel thread which: 21211da177e4SLinus Torvalds * 21221da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 21231da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2124d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 21251da177e4SLinus Torvalds */ 21261da177e4SLinus Torvalds 2127e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2128867868fbSNeilBrown sector_t sect, int sectors) 2129867868fbSNeilBrown { 2130fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2131867868fbSNeilBrown while(sectors) { 2132867868fbSNeilBrown int s = sectors; 2133867868fbSNeilBrown int d = read_disk; 2134867868fbSNeilBrown int success = 0; 2135867868fbSNeilBrown int start; 21363cb03002SNeilBrown struct md_rdev *rdev; 2137867868fbSNeilBrown 2138867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2139867868fbSNeilBrown s = PAGE_SIZE >> 9; 2140867868fbSNeilBrown 2141867868fbSNeilBrown do { 2142d2eb35acSNeilBrown sector_t first_bad; 2143d2eb35acSNeilBrown int bad_sectors; 2144d2eb35acSNeilBrown 2145707a6a42SNeilBrown rcu_read_lock(); 2146707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2147867868fbSNeilBrown if (rdev && 2148da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2149da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2150da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2151d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2152707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2153707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2154707a6a42SNeilBrown rcu_read_unlock(); 2155707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2156796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2157867868fbSNeilBrown success = 1; 2158707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2159707a6a42SNeilBrown if (success) 2160707a6a42SNeilBrown break; 2161707a6a42SNeilBrown } else 2162707a6a42SNeilBrown rcu_read_unlock(); 2163867868fbSNeilBrown d++; 21648f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2165867868fbSNeilBrown d = 0; 2166867868fbSNeilBrown } while (!success && d != read_disk); 2167867868fbSNeilBrown 2168867868fbSNeilBrown if (!success) { 2169d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 21703cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2171d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2172d8f05d29SNeilBrown md_error(mddev, rdev); 2173867868fbSNeilBrown break; 2174867868fbSNeilBrown } 2175867868fbSNeilBrown /* write it back and re-read */ 2176867868fbSNeilBrown start = d; 2177867868fbSNeilBrown while (d != read_disk) { 2178867868fbSNeilBrown if (d==0) 21798f19ccb2SNeilBrown d = conf->raid_disks * 2; 2180867868fbSNeilBrown d--; 2181707a6a42SNeilBrown rcu_read_lock(); 2182707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2183867868fbSNeilBrown if (rdev && 2184707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2185707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2186707a6a42SNeilBrown rcu_read_unlock(); 2187d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2188d8f05d29SNeilBrown conf->tmppage, WRITE); 2189707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2190707a6a42SNeilBrown } else 2191707a6a42SNeilBrown rcu_read_unlock(); 2192867868fbSNeilBrown } 2193867868fbSNeilBrown d = start; 2194867868fbSNeilBrown while (d != read_disk) { 2195867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2196867868fbSNeilBrown if (d==0) 21978f19ccb2SNeilBrown d = conf->raid_disks * 2; 2198867868fbSNeilBrown d--; 2199707a6a42SNeilBrown rcu_read_lock(); 2200707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2201867868fbSNeilBrown if (rdev && 2202b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2203707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2204707a6a42SNeilBrown rcu_read_unlock(); 2205d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2206d8f05d29SNeilBrown conf->tmppage, READ)) { 2207867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 22081d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2209867868fbSNeilBrown mdname(mddev), s, 2210969b755aSRandy Dunlap (unsigned long long)(sect + 2211969b755aSRandy Dunlap rdev->data_offset), 2212867868fbSNeilBrown bdevname(rdev->bdev, b)); 2213867868fbSNeilBrown } 2214707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2215707a6a42SNeilBrown } else 2216707a6a42SNeilBrown rcu_read_unlock(); 2217867868fbSNeilBrown } 2218867868fbSNeilBrown sectors -= s; 2219867868fbSNeilBrown sect += s; 2220867868fbSNeilBrown } 2221867868fbSNeilBrown } 2222867868fbSNeilBrown 22239f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2224cd5ff9a1SNeilBrown { 2225fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2226e8096360SNeilBrown struct r1conf *conf = mddev->private; 22273cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2228cd5ff9a1SNeilBrown 2229cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2230cd5ff9a1SNeilBrown * we just recently had a write error. 2231cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2232cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2233cd5ff9a1SNeilBrown * a bad block. 2234cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2235cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2236cd5ff9a1SNeilBrown * 2237cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2238cd5ff9a1SNeilBrown */ 2239cd5ff9a1SNeilBrown 2240cd5ff9a1SNeilBrown int block_sectors; 2241cd5ff9a1SNeilBrown sector_t sector; 2242cd5ff9a1SNeilBrown int sectors; 2243cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2244cd5ff9a1SNeilBrown int ok = 1; 2245cd5ff9a1SNeilBrown 2246cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2247cd5ff9a1SNeilBrown return 0; 2248cd5ff9a1SNeilBrown 2249ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2250ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2251cd5ff9a1SNeilBrown sector = r1_bio->sector; 2252cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2253cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2254cd5ff9a1SNeilBrown - sector; 2255cd5ff9a1SNeilBrown 2256cd5ff9a1SNeilBrown while (sect_to_write) { 2257cd5ff9a1SNeilBrown struct bio *wbio; 2258cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2259cd5ff9a1SNeilBrown sectors = sect_to_write; 2260cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2261cd5ff9a1SNeilBrown 2262b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2263b783863fSKent Overstreet unsigned vcnt = r1_bio->behind_page_count; 2264b783863fSKent Overstreet struct bio_vec *vec = r1_bio->behind_bvecs; 2265b783863fSKent Overstreet 2266b783863fSKent Overstreet while (!vec->bv_page) { 2267b783863fSKent Overstreet vec++; 2268b783863fSKent Overstreet vcnt--; 2269b783863fSKent Overstreet } 2270b783863fSKent Overstreet 2271cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 2272cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 2273b783863fSKent Overstreet 2274cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 2275b783863fSKent Overstreet } else { 2276b783863fSKent Overstreet wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 2277b783863fSKent Overstreet } 2278b783863fSKent Overstreet 2279796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 22804f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 22814f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2282cd5ff9a1SNeilBrown 22836678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 22844f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2285cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 22864e49ea4aSMike Christie 22874e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2288cd5ff9a1SNeilBrown /* failure! */ 2289cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2290cd5ff9a1SNeilBrown sectors, 0) 2291cd5ff9a1SNeilBrown && ok; 2292cd5ff9a1SNeilBrown 2293cd5ff9a1SNeilBrown bio_put(wbio); 2294cd5ff9a1SNeilBrown sect_to_write -= sectors; 2295cd5ff9a1SNeilBrown sector += sectors; 2296cd5ff9a1SNeilBrown sectors = block_sectors; 2297cd5ff9a1SNeilBrown } 2298cd5ff9a1SNeilBrown return ok; 2299cd5ff9a1SNeilBrown } 2300cd5ff9a1SNeilBrown 2301e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 230262096bceSNeilBrown { 230362096bceSNeilBrown int m; 230462096bceSNeilBrown int s = r1_bio->sectors; 23058f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 23063cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 230762096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 230862096bceSNeilBrown if (bio->bi_end_io == NULL) 230962096bceSNeilBrown continue; 23104246a0b6SChristoph Hellwig if (!bio->bi_error && 231162096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2312c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 231362096bceSNeilBrown } 23144246a0b6SChristoph Hellwig if (bio->bi_error && 231562096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 231662096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 231762096bceSNeilBrown md_error(conf->mddev, rdev); 231862096bceSNeilBrown } 231962096bceSNeilBrown } 232062096bceSNeilBrown put_buf(r1_bio); 232162096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 232262096bceSNeilBrown } 232362096bceSNeilBrown 2324e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 232562096bceSNeilBrown { 232662096bceSNeilBrown int m; 232755ce74d4SNeilBrown bool fail = false; 23288f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 232962096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 23303cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 233162096bceSNeilBrown rdev_clear_badblocks(rdev, 233262096bceSNeilBrown r1_bio->sector, 2333c6563a8cSNeilBrown r1_bio->sectors, 0); 233462096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 233562096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 233662096bceSNeilBrown /* This drive got a write error. We need to 233762096bceSNeilBrown * narrow down and record precise write 233862096bceSNeilBrown * errors. 233962096bceSNeilBrown */ 234055ce74d4SNeilBrown fail = true; 234162096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 234262096bceSNeilBrown md_error(conf->mddev, 234362096bceSNeilBrown conf->mirrors[m].rdev); 234462096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 234562096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 234662096bceSNeilBrown } 234762096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 234862096bceSNeilBrown conf->mddev); 234962096bceSNeilBrown } 235055ce74d4SNeilBrown if (fail) { 235155ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 235255ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2353ccfc7bf1SNate Dailey conf->nr_queued++; 235455ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 235555ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2356bd8688a1SNeilBrown } else { 2357bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2358bd8688a1SNeilBrown close_write(r1_bio); 235962096bceSNeilBrown raid_end_bio_io(r1_bio); 236062096bceSNeilBrown } 2361bd8688a1SNeilBrown } 236262096bceSNeilBrown 2363e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 236462096bceSNeilBrown { 236562096bceSNeilBrown int disk; 236662096bceSNeilBrown int max_sectors; 2367fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 236862096bceSNeilBrown struct bio *bio; 236962096bceSNeilBrown char b[BDEVNAME_SIZE]; 23703cb03002SNeilBrown struct md_rdev *rdev; 2371109e3765SNeilBrown dev_t bio_dev; 2372109e3765SNeilBrown sector_t bio_sector; 237362096bceSNeilBrown 237462096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 237562096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 237662096bceSNeilBrown * the block and we can fix it. 237762096bceSNeilBrown * We freeze all other IO, and try reading the block from 237862096bceSNeilBrown * other devices. When we find one, we re-write 237962096bceSNeilBrown * and check it that fixes the read error. 238062096bceSNeilBrown * This is all done synchronously while the array is 238162096bceSNeilBrown * frozen 238262096bceSNeilBrown */ 23837449f699STomasz Majchrzak 23847449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 23857449f699STomasz Majchrzak bdevname(bio->bi_bdev, b); 2386109e3765SNeilBrown bio_dev = bio->bi_bdev->bd_dev; 2387109e3765SNeilBrown bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; 23887449f699STomasz Majchrzak bio_put(bio); 23897449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 23907449f699STomasz Majchrzak 23912e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 23922e52d449SNeilBrown if (mddev->ro == 0 23932e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2394e2d59925SNeilBrown freeze_array(conf, 1); 239562096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 239662096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 239762096bceSNeilBrown unfreeze_array(conf); 23987449f699STomasz Majchrzak } else { 23997449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 24007449f699STomasz Majchrzak } 24017449f699STomasz Majchrzak 24022e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 240362096bceSNeilBrown 240462096bceSNeilBrown read_more: 240562096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 240662096bceSNeilBrown if (disk == -1) { 24071d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 240862096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 240962096bceSNeilBrown raid_end_bio_io(r1_bio); 241062096bceSNeilBrown } else { 241162096bceSNeilBrown const unsigned long do_sync 24121eff9d32SJens Axboe = r1_bio->master_bio->bi_opf & REQ_SYNC; 241362096bceSNeilBrown r1_bio->read_disk = disk; 241462096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 24154f024f37SKent Overstreet bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, 24164f024f37SKent Overstreet max_sectors); 241762096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 241862096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 24191d41c216SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 242062096bceSNeilBrown mdname(mddev), 242162096bceSNeilBrown (unsigned long long)r1_bio->sector, 242262096bceSNeilBrown bdevname(rdev->bdev, b)); 24234f024f37SKent Overstreet bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; 242462096bceSNeilBrown bio->bi_bdev = rdev->bdev; 242562096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 2426796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, do_sync); 24272e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags) && 24282e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 24292e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 243062096bceSNeilBrown bio->bi_private = r1_bio; 243162096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 243262096bceSNeilBrown /* Drat - have to split this up more */ 243362096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 243462096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 24354f024f37SKent Overstreet - mbio->bi_iter.bi_sector); 243662096bceSNeilBrown r1_bio->sectors = max_sectors; 243762096bceSNeilBrown spin_lock_irq(&conf->device_lock); 243862096bceSNeilBrown if (mbio->bi_phys_segments == 0) 243962096bceSNeilBrown mbio->bi_phys_segments = 2; 244062096bceSNeilBrown else 244162096bceSNeilBrown mbio->bi_phys_segments++; 244262096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 2443109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2444109e3765SNeilBrown bio, bio_dev, bio_sector); 244562096bceSNeilBrown generic_make_request(bio); 244662096bceSNeilBrown bio = NULL; 244762096bceSNeilBrown 244862096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 244962096bceSNeilBrown 245062096bceSNeilBrown r1_bio->master_bio = mbio; 2451aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(mbio) - sectors_handled; 245262096bceSNeilBrown r1_bio->state = 0; 245362096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 245462096bceSNeilBrown r1_bio->mddev = mddev; 24554f024f37SKent Overstreet r1_bio->sector = mbio->bi_iter.bi_sector + 24564f024f37SKent Overstreet sectors_handled; 245762096bceSNeilBrown 245862096bceSNeilBrown goto read_more; 2459109e3765SNeilBrown } else { 2460109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2461109e3765SNeilBrown bio, bio_dev, bio_sector); 246262096bceSNeilBrown generic_make_request(bio); 246362096bceSNeilBrown } 246462096bceSNeilBrown } 2465109e3765SNeilBrown } 246662096bceSNeilBrown 24674ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 24681da177e4SLinus Torvalds { 24694ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 24709f2c9d12SNeilBrown struct r1bio *r1_bio; 24711da177e4SLinus Torvalds unsigned long flags; 2472e8096360SNeilBrown struct r1conf *conf = mddev->private; 24731da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2474e1dfa0a2SNeilBrown struct blk_plug plug; 24751da177e4SLinus Torvalds 24761da177e4SLinus Torvalds md_check_recovery(mddev); 24771da177e4SLinus Torvalds 247855ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 24792953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 248055ce74d4SNeilBrown LIST_HEAD(tmp); 248155ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 24822953079cSShaohua Li if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 2483ccfc7bf1SNate Dailey while (!list_empty(&conf->bio_end_io_list)) { 2484ccfc7bf1SNate Dailey list_move(conf->bio_end_io_list.prev, &tmp); 2485ccfc7bf1SNate Dailey conf->nr_queued--; 2486ccfc7bf1SNate Dailey } 248755ce74d4SNeilBrown } 248855ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 248955ce74d4SNeilBrown while (!list_empty(&tmp)) { 2490a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2491a452744bSMikulas Patocka retry_list); 249255ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2493bd8688a1SNeilBrown if (mddev->degraded) 2494bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2495bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2496bd8688a1SNeilBrown close_write(r1_bio); 249755ce74d4SNeilBrown raid_end_bio_io(r1_bio); 249855ce74d4SNeilBrown } 249955ce74d4SNeilBrown } 250055ce74d4SNeilBrown 2501e1dfa0a2SNeilBrown blk_start_plug(&plug); 25021da177e4SLinus Torvalds for (;;) { 2503a35e63efSNeilBrown 25047eaceaccSJens Axboe flush_pending_writes(conf); 2505a35e63efSNeilBrown 25061da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2507a35e63efSNeilBrown if (list_empty(head)) { 2508191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25091da177e4SLinus Torvalds break; 2510a35e63efSNeilBrown } 25119f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25121da177e4SLinus Torvalds list_del(head->prev); 2513ddaf22abSNeilBrown conf->nr_queued--; 25141da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25151da177e4SLinus Torvalds 25161da177e4SLinus Torvalds mddev = r1_bio->mddev; 2517070ec55dSNeilBrown conf = mddev->private; 25184367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2519d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 252062096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 252162096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 252262096bceSNeilBrown else 25231da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2524cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 252562096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 252662096bceSNeilBrown handle_write_finished(conf, r1_bio); 252762096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 252862096bceSNeilBrown handle_read_error(conf, r1_bio); 2529d2eb35acSNeilBrown else 2530d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2531d2eb35acSNeilBrown * context 2532d2eb35acSNeilBrown */ 2533d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 253462096bceSNeilBrown 25351d9d5241SNeilBrown cond_resched(); 25362953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2537de393cdeSNeilBrown md_check_recovery(mddev); 25381da177e4SLinus Torvalds } 2539e1dfa0a2SNeilBrown blk_finish_plug(&plug); 25401da177e4SLinus Torvalds } 25411da177e4SLinus Torvalds 2542e8096360SNeilBrown static int init_resync(struct r1conf *conf) 25431da177e4SLinus Torvalds { 25441da177e4SLinus Torvalds int buffs; 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 25479e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 25481da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 25491da177e4SLinus Torvalds conf->poolinfo); 25501da177e4SLinus Torvalds if (!conf->r1buf_pool) 25511da177e4SLinus Torvalds return -ENOMEM; 25521da177e4SLinus Torvalds conf->next_resync = 0; 25531da177e4SLinus Torvalds return 0; 25541da177e4SLinus Torvalds } 25551da177e4SLinus Torvalds 25561da177e4SLinus Torvalds /* 25571da177e4SLinus Torvalds * perform a "sync" on one "block" 25581da177e4SLinus Torvalds * 25591da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 25601da177e4SLinus Torvalds * requests - conflict with active sync requests. 25611da177e4SLinus Torvalds * 25621da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 25631da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 25641da177e4SLinus Torvalds */ 25651da177e4SLinus Torvalds 2566849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2567849674e4SShaohua Li int *skipped) 25681da177e4SLinus Torvalds { 2569e8096360SNeilBrown struct r1conf *conf = mddev->private; 25709f2c9d12SNeilBrown struct r1bio *r1_bio; 25711da177e4SLinus Torvalds struct bio *bio; 25721da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 25733e198f78SNeilBrown int disk = -1; 25741da177e4SLinus Torvalds int i; 25753e198f78SNeilBrown int wonly = -1; 25763e198f78SNeilBrown int write_targets = 0, read_targets = 0; 257757dab0bdSNeilBrown sector_t sync_blocks; 2578e3b9703eSNeilBrown int still_degraded = 0; 257906f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 258006f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 25811da177e4SLinus Torvalds 25821da177e4SLinus Torvalds if (!conf->r1buf_pool) 25831da177e4SLinus Torvalds if (init_resync(conf)) 258457afd89fSNeilBrown return 0; 25851da177e4SLinus Torvalds 258658c0fed4SAndre Noll max_sector = mddev->dev_sectors; 25871da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2588191ea9b2SNeilBrown /* If we aborted, we need to abort the 2589191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2590191ea9b2SNeilBrown * only be one in raid1 resync. 2591191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2592191ea9b2SNeilBrown */ 25936a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 25946a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2595191ea9b2SNeilBrown &sync_blocks, 1); 25966a806c51SNeilBrown else /* completed sync */ 2597191ea9b2SNeilBrown conf->fullsync = 0; 25986a806c51SNeilBrown 25996a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 26001da177e4SLinus Torvalds close_sync(conf); 2601c40f341fSGoldwyn Rodrigues 2602c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2603c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2604c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2605c40f341fSGoldwyn Rodrigues } 26061da177e4SLinus Torvalds return 0; 26071da177e4SLinus Torvalds } 26081da177e4SLinus Torvalds 260907d84d10SNeilBrown if (mddev->bitmap == NULL && 261007d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26116394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 261207d84d10SNeilBrown conf->fullsync == 0) { 261307d84d10SNeilBrown *skipped = 1; 261407d84d10SNeilBrown return max_sector - sector_nr; 261507d84d10SNeilBrown } 26166394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26176394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 26186394cca5SNeilBrown */ 2619e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2620e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2621191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2622191ea9b2SNeilBrown *skipped = 1; 2623191ea9b2SNeilBrown return sync_blocks; 2624191ea9b2SNeilBrown } 262517999be4SNeilBrown 26267ac50447STomasz Majchrzak /* 26277ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 26287ac50447STomasz Majchrzak * though before starting on this new sync request. 26297ac50447STomasz Majchrzak */ 26307ac50447STomasz Majchrzak if (conf->nr_waiting) 26317ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 26327ac50447STomasz Majchrzak 2633c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2634c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2635c40f341fSGoldwyn Rodrigues */ 2636c40f341fSGoldwyn Rodrigues 2637c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2638c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 26391c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 264017999be4SNeilBrown 2641c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 26421da177e4SLinus Torvalds 26433e198f78SNeilBrown rcu_read_lock(); 26443e198f78SNeilBrown /* 26453e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 26463e198f78SNeilBrown * we might want to read from a different device. So we 26473e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 26483e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 26493e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 26503e198f78SNeilBrown * is OK. 26513e198f78SNeilBrown */ 26521da177e4SLinus Torvalds 26531da177e4SLinus Torvalds r1_bio->mddev = mddev; 26541da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2655191ea9b2SNeilBrown r1_bio->state = 0; 26561da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 26571da177e4SLinus Torvalds 26588f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 26593cb03002SNeilBrown struct md_rdev *rdev; 26601da177e4SLinus Torvalds bio = r1_bio->bios[i]; 26612aabaa65SKent Overstreet bio_reset(bio); 26621da177e4SLinus Torvalds 26633e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 26643e198f78SNeilBrown if (rdev == NULL || 26653e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 26668f19ccb2SNeilBrown if (i < conf->raid_disks) 2667e3b9703eSNeilBrown still_degraded = 1; 26683e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2669796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 26701da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 26711da177e4SLinus Torvalds write_targets ++; 26723e198f78SNeilBrown } else { 26733e198f78SNeilBrown /* may need to read from here */ 267406f60385SNeilBrown sector_t first_bad = MaxSector; 267506f60385SNeilBrown int bad_sectors; 267606f60385SNeilBrown 267706f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 267806f60385SNeilBrown &first_bad, &bad_sectors)) { 267906f60385SNeilBrown if (first_bad > sector_nr) 268006f60385SNeilBrown good_sectors = first_bad - sector_nr; 268106f60385SNeilBrown else { 268206f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 268306f60385SNeilBrown if (min_bad == 0 || 268406f60385SNeilBrown min_bad > bad_sectors) 268506f60385SNeilBrown min_bad = bad_sectors; 268606f60385SNeilBrown } 268706f60385SNeilBrown } 268806f60385SNeilBrown if (sector_nr < first_bad) { 26893e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 26903e198f78SNeilBrown if (wonly < 0) 26913e198f78SNeilBrown wonly = i; 26923e198f78SNeilBrown } else { 26933e198f78SNeilBrown if (disk < 0) 26943e198f78SNeilBrown disk = i; 26953e198f78SNeilBrown } 2696796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 269706f60385SNeilBrown bio->bi_end_io = end_sync_read; 26983e198f78SNeilBrown read_targets++; 2699d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2700d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2701d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2702d57368afSAlexander Lyakas /* 2703d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2704d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2705d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2706d57368afSAlexander Lyakas * this device alone for this sync request. 2707d57368afSAlexander Lyakas */ 2708796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2709d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2710d57368afSAlexander Lyakas write_targets++; 27113e198f78SNeilBrown } 271206f60385SNeilBrown } 271306f60385SNeilBrown if (bio->bi_end_io) { 27143e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 27154f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 27163e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 27171da177e4SLinus Torvalds bio->bi_private = r1_bio; 27182e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 27192e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 27201da177e4SLinus Torvalds } 272106f60385SNeilBrown } 27223e198f78SNeilBrown rcu_read_unlock(); 27233e198f78SNeilBrown if (disk < 0) 27243e198f78SNeilBrown disk = wonly; 27253e198f78SNeilBrown r1_bio->read_disk = disk; 2726191ea9b2SNeilBrown 272706f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 272806f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 272906f60385SNeilBrown * need to mark them bad on all write targets 273006f60385SNeilBrown */ 273106f60385SNeilBrown int ok = 1; 27328f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 273306f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2734a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 273506f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 273606f60385SNeilBrown min_bad, 0 273706f60385SNeilBrown ) && ok; 273806f60385SNeilBrown } 27392953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 274006f60385SNeilBrown *skipped = 1; 274106f60385SNeilBrown put_buf(r1_bio); 274206f60385SNeilBrown 274306f60385SNeilBrown if (!ok) { 274406f60385SNeilBrown /* Cannot record the badblocks, so need to 274506f60385SNeilBrown * abort the resync. 274606f60385SNeilBrown * If there are multiple read targets, could just 274706f60385SNeilBrown * fail the really bad ones ??? 274806f60385SNeilBrown */ 274906f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 275006f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 275106f60385SNeilBrown return 0; 275206f60385SNeilBrown } else 275306f60385SNeilBrown return min_bad; 275406f60385SNeilBrown 275506f60385SNeilBrown } 275606f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 275706f60385SNeilBrown /* only resync enough to reach the next bad->good 275806f60385SNeilBrown * transition */ 275906f60385SNeilBrown good_sectors = min_bad; 276006f60385SNeilBrown } 276106f60385SNeilBrown 27623e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 27633e198f78SNeilBrown /* extra read targets are also write targets */ 27643e198f78SNeilBrown write_targets += read_targets-1; 27653e198f78SNeilBrown 27663e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 27671da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 27681da177e4SLinus Torvalds * drives must be failed - so we are finished 27691da177e4SLinus Torvalds */ 2770b7219ccbSNeilBrown sector_t rv; 2771b7219ccbSNeilBrown if (min_bad > 0) 2772b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2773b7219ccbSNeilBrown rv = max_sector - sector_nr; 277457afd89fSNeilBrown *skipped = 1; 27751da177e4SLinus Torvalds put_buf(r1_bio); 27761da177e4SLinus Torvalds return rv; 27771da177e4SLinus Torvalds } 27781da177e4SLinus Torvalds 2779c6207277SNeilBrown if (max_sector > mddev->resync_max) 2780c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 278106f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 278206f60385SNeilBrown max_sector = sector_nr + good_sectors; 27831da177e4SLinus Torvalds nr_sectors = 0; 2784289e99e8SNeilBrown sync_blocks = 0; 27851da177e4SLinus Torvalds do { 27861da177e4SLinus Torvalds struct page *page; 27871da177e4SLinus Torvalds int len = PAGE_SIZE; 27881da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 27891da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 27901da177e4SLinus Torvalds if (len == 0) 27911da177e4SLinus Torvalds break; 2792ab7a30c7SNeilBrown if (sync_blocks == 0) { 27936a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2794e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2795e5de485fSNeilBrown !conf->fullsync && 2796e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2797191ea9b2SNeilBrown break; 27987571ae88SNeilBrown if ((len >> 9) > sync_blocks) 27996a806c51SNeilBrown len = sync_blocks<<9; 2800ab7a30c7SNeilBrown } 2801191ea9b2SNeilBrown 28028f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 28031da177e4SLinus Torvalds bio = r1_bio->bios[i]; 28041da177e4SLinus Torvalds if (bio->bi_end_io) { 2805d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 28061da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 28071da177e4SLinus Torvalds /* stop here */ 2808d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 28091da177e4SLinus Torvalds while (i > 0) { 28101da177e4SLinus Torvalds i--; 28111da177e4SLinus Torvalds bio = r1_bio->bios[i]; 28126a806c51SNeilBrown if (bio->bi_end_io==NULL) 28136a806c51SNeilBrown continue; 28141da177e4SLinus Torvalds /* remove last page from this bio */ 28151da177e4SLinus Torvalds bio->bi_vcnt--; 28164f024f37SKent Overstreet bio->bi_iter.bi_size -= len; 2817b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 28181da177e4SLinus Torvalds } 28191da177e4SLinus Torvalds goto bio_full; 28201da177e4SLinus Torvalds } 28211da177e4SLinus Torvalds } 28221da177e4SLinus Torvalds } 28231da177e4SLinus Torvalds nr_sectors += len>>9; 28241da177e4SLinus Torvalds sector_nr += len>>9; 2825191ea9b2SNeilBrown sync_blocks -= (len>>9); 28261da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 28271da177e4SLinus Torvalds bio_full: 28281da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 28291da177e4SLinus Torvalds 2830c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2831c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2832c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2833c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2834c40f341fSGoldwyn Rodrigues /* Send resync message */ 2835c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2836c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2837c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2838c40f341fSGoldwyn Rodrigues } 2839c40f341fSGoldwyn Rodrigues 2840d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2841d11c171eSNeilBrown * compare 2842d11c171eSNeilBrown */ 2843d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2844d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 28452d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2846d11c171eSNeilBrown bio = r1_bio->bios[i]; 2847d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 28482d4f4f33SNeilBrown read_targets--; 2849ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 28502e52d449SNeilBrown if (read_targets == 1) 28512e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 28521da177e4SLinus Torvalds generic_make_request(bio); 2853d11c171eSNeilBrown } 2854d11c171eSNeilBrown } 2855d11c171eSNeilBrown } else { 2856d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2857d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2858ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 28592e52d449SNeilBrown if (read_targets == 1) 28602e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2861d11c171eSNeilBrown generic_make_request(bio); 2862d11c171eSNeilBrown 2863d11c171eSNeilBrown } 28641da177e4SLinus Torvalds return nr_sectors; 28651da177e4SLinus Torvalds } 28661da177e4SLinus Torvalds 2867fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 286880c3a6ceSDan Williams { 286980c3a6ceSDan Williams if (sectors) 287080c3a6ceSDan Williams return sectors; 287180c3a6ceSDan Williams 287280c3a6ceSDan Williams return mddev->dev_sectors; 287380c3a6ceSDan Williams } 287480c3a6ceSDan Williams 2875e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 28761da177e4SLinus Torvalds { 2877e8096360SNeilBrown struct r1conf *conf; 2878709ae487SNeilBrown int i; 28790eaf822cSJonathan Brassow struct raid1_info *disk; 28803cb03002SNeilBrown struct md_rdev *rdev; 2881709ae487SNeilBrown int err = -ENOMEM; 28821da177e4SLinus Torvalds 2883e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 28841da177e4SLinus Torvalds if (!conf) 2885709ae487SNeilBrown goto abort; 28861da177e4SLinus Torvalds 28870eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 28888f19ccb2SNeilBrown * mddev->raid_disks * 2, 28891da177e4SLinus Torvalds GFP_KERNEL); 28901da177e4SLinus Torvalds if (!conf->mirrors) 2891709ae487SNeilBrown goto abort; 28921da177e4SLinus Torvalds 2893ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2894ddaf22abSNeilBrown if (!conf->tmppage) 2895709ae487SNeilBrown goto abort; 2896ddaf22abSNeilBrown 2897709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 28981da177e4SLinus Torvalds if (!conf->poolinfo) 2899709ae487SNeilBrown goto abort; 29008f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29011da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 29021da177e4SLinus Torvalds r1bio_pool_free, 29031da177e4SLinus Torvalds conf->poolinfo); 29041da177e4SLinus Torvalds if (!conf->r1bio_pool) 2905709ae487SNeilBrown goto abort; 2906709ae487SNeilBrown 2907ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 29081da177e4SLinus Torvalds 2909c19d5798SNeilBrown err = -EINVAL; 2910e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2911dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2912aba336bdSNeilBrown struct request_queue *q; 2913709ae487SNeilBrown int disk_idx = rdev->raid_disk; 29141da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 29151da177e4SLinus Torvalds || disk_idx < 0) 29161da177e4SLinus Torvalds continue; 2917c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 291802b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 2919c19d5798SNeilBrown else 29201da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 29211da177e4SLinus Torvalds 2922c19d5798SNeilBrown if (disk->rdev) 2923c19d5798SNeilBrown goto abort; 29241da177e4SLinus Torvalds disk->rdev = rdev; 2925aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 29261da177e4SLinus Torvalds 29271da177e4SLinus Torvalds disk->head_position = 0; 292812cee5a8SShaohua Li disk->seq_start = MaxSector; 29291da177e4SLinus Torvalds } 29301da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 29311da177e4SLinus Torvalds conf->mddev = mddev; 29321da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 293355ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 29341da177e4SLinus Torvalds 29351da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 293617999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 29371da177e4SLinus Torvalds 2938191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 293934db0cd6SNeilBrown conf->pending_count = 0; 2940d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2941191ea9b2SNeilBrown 294279ef3a8aSmajianpeng conf->start_next_window = MaxSector; 294379ef3a8aSmajianpeng conf->current_window_requests = conf->next_window_requests = 0; 294479ef3a8aSmajianpeng 2945c19d5798SNeilBrown err = -EIO; 29468f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 29471da177e4SLinus Torvalds 29481da177e4SLinus Torvalds disk = conf->mirrors + i; 29491da177e4SLinus Torvalds 2950c19d5798SNeilBrown if (i < conf->raid_disks && 2951c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2952c19d5798SNeilBrown /* This slot has a replacement. */ 2953c19d5798SNeilBrown if (!disk->rdev) { 2954c19d5798SNeilBrown /* No original, just make the replacement 2955c19d5798SNeilBrown * a recovering spare 2956c19d5798SNeilBrown */ 2957c19d5798SNeilBrown disk->rdev = 2958c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2959c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2960c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2961c19d5798SNeilBrown /* Original is not in_sync - bad */ 2962c19d5798SNeilBrown goto abort; 2963c19d5798SNeilBrown } 2964c19d5798SNeilBrown 29655fd6c1dcSNeilBrown if (!disk->rdev || 29665fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 29671da177e4SLinus Torvalds disk->head_position = 0; 29684f0a5e01SJonathan Brassow if (disk->rdev && 29694f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 297017571284SNeilBrown conf->fullsync = 1; 2971be4d3280SShaohua Li } 29721da177e4SLinus Torvalds } 2973709ae487SNeilBrown 2974709ae487SNeilBrown err = -ENOMEM; 29750232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 29761d41c216SNeilBrown if (!conf->thread) 2977709ae487SNeilBrown goto abort; 2978191ea9b2SNeilBrown 2979709ae487SNeilBrown return conf; 2980709ae487SNeilBrown 2981709ae487SNeilBrown abort: 2982709ae487SNeilBrown if (conf) { 2983709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2984709ae487SNeilBrown kfree(conf->mirrors); 2985709ae487SNeilBrown safe_put_page(conf->tmppage); 2986709ae487SNeilBrown kfree(conf->poolinfo); 2987709ae487SNeilBrown kfree(conf); 2988709ae487SNeilBrown } 2989709ae487SNeilBrown return ERR_PTR(err); 2990709ae487SNeilBrown } 2991709ae487SNeilBrown 2992afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 2993849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 2994709ae487SNeilBrown { 2995e8096360SNeilBrown struct r1conf *conf; 2996709ae487SNeilBrown int i; 29973cb03002SNeilBrown struct md_rdev *rdev; 29985220ea1eSmajianpeng int ret; 29992ff8cc2cSShaohua Li bool discard_supported = false; 3000709ae487SNeilBrown 3001709ae487SNeilBrown if (mddev->level != 1) { 30021d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3003709ae487SNeilBrown mdname(mddev), mddev->level); 3004709ae487SNeilBrown return -EIO; 3005709ae487SNeilBrown } 3006709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 30071d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3008709ae487SNeilBrown mdname(mddev)); 3009709ae487SNeilBrown return -EIO; 3010709ae487SNeilBrown } 3011709ae487SNeilBrown /* 3012709ae487SNeilBrown * copy the already verified devices into our private RAID1 3013709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3014afa0f557SNeilBrown * should be freed in raid1_free()] 3015709ae487SNeilBrown */ 3016709ae487SNeilBrown if (mddev->private == NULL) 3017709ae487SNeilBrown conf = setup_conf(mddev); 3018709ae487SNeilBrown else 3019709ae487SNeilBrown conf = mddev->private; 3020709ae487SNeilBrown 3021709ae487SNeilBrown if (IS_ERR(conf)) 3022709ae487SNeilBrown return PTR_ERR(conf); 3023709ae487SNeilBrown 3024c8dc9c65SJoe Lawrence if (mddev->queue) 30255026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 30265026d7a9SH. Peter Anvin 3027dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 30281ed7242eSJonathan Brassow if (!mddev->gendisk) 30291ed7242eSJonathan Brassow continue; 3030709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3031709ae487SNeilBrown rdev->data_offset << 9); 30322ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 30332ff8cc2cSShaohua Li discard_supported = true; 3034709ae487SNeilBrown } 3035709ae487SNeilBrown 3036709ae487SNeilBrown mddev->degraded = 0; 3037709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 3038709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3039709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3040709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3041709ae487SNeilBrown mddev->degraded++; 3042709ae487SNeilBrown 3043709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3044709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3045709ae487SNeilBrown 30468c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 30471d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 30488c6ac868SAndre Noll mdname(mddev)); 30491d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 30501da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 30511da177e4SLinus Torvalds mddev->raid_disks); 3052709ae487SNeilBrown 30531da177e4SLinus Torvalds /* 30541da177e4SLinus Torvalds * Ok, everything is just fine now 30551da177e4SLinus Torvalds */ 3056709ae487SNeilBrown mddev->thread = conf->thread; 3057709ae487SNeilBrown conf->thread = NULL; 3058709ae487SNeilBrown mddev->private = conf; 305946533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3060709ae487SNeilBrown 30611f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 30621da177e4SLinus Torvalds 30631ed7242eSJonathan Brassow if (mddev->queue) { 30642ff8cc2cSShaohua Li if (discard_supported) 30652ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 30662ff8cc2cSShaohua Li mddev->queue); 30672ff8cc2cSShaohua Li else 30682ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 30692ff8cc2cSShaohua Li mddev->queue); 30701ed7242eSJonathan Brassow } 30715220ea1eSmajianpeng 30725220ea1eSmajianpeng ret = md_integrity_register(mddev); 30735aa61f42SNeilBrown if (ret) { 30745aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 3075afa0f557SNeilBrown raid1_free(mddev, conf); 30765aa61f42SNeilBrown } 30775220ea1eSmajianpeng return ret; 30781da177e4SLinus Torvalds } 30791da177e4SLinus Torvalds 3080afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 30811da177e4SLinus Torvalds { 3082afa0f557SNeilBrown struct r1conf *conf = priv; 30834b6d287fSNeilBrown 30841da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 30851da177e4SLinus Torvalds kfree(conf->mirrors); 30860fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 30871da177e4SLinus Torvalds kfree(conf->poolinfo); 30881da177e4SLinus Torvalds kfree(conf); 30891da177e4SLinus Torvalds } 30901da177e4SLinus Torvalds 3091fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 30921da177e4SLinus Torvalds { 30931da177e4SLinus Torvalds /* no resync is happening, and there is enough space 30941da177e4SLinus Torvalds * on all devices, so we can resize. 30951da177e4SLinus Torvalds * We need to make sure resync covers any new space. 30961da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 30971da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 30981da177e4SLinus Torvalds * worth it. 30991da177e4SLinus Torvalds */ 3100a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3101a4a6125aSNeilBrown if (mddev->external_size && 3102a4a6125aSNeilBrown mddev->array_sectors > newsize) 3103b522adcdSDan Williams return -EINVAL; 3104a4a6125aSNeilBrown if (mddev->bitmap) { 3105a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3106a4a6125aSNeilBrown if (ret) 3107a4a6125aSNeilBrown return ret; 3108a4a6125aSNeilBrown } 3109a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3110f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 3111449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 3112b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3113b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 311458c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 31151da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 31161da177e4SLinus Torvalds } 3117b522adcdSDan Williams mddev->dev_sectors = sectors; 31184b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 31191da177e4SLinus Torvalds return 0; 31201da177e4SLinus Torvalds } 31211da177e4SLinus Torvalds 3122fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 31231da177e4SLinus Torvalds { 31241da177e4SLinus Torvalds /* We need to: 31251da177e4SLinus Torvalds * 1/ resize the r1bio_pool 31261da177e4SLinus Torvalds * 2/ resize conf->mirrors 31271da177e4SLinus Torvalds * 31281da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 31291da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 31301da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 31316ea9c07cSNeilBrown * 31326ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 31336ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 31341da177e4SLinus Torvalds */ 31351da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 31361da177e4SLinus Torvalds struct pool_info *newpoolinfo; 31370eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3138e8096360SNeilBrown struct r1conf *conf = mddev->private; 313963c70c4fSNeilBrown int cnt, raid_disks; 3140c04be0aaSNeilBrown unsigned long flags; 3141b5470dc5SDan Williams int d, d2, err; 31421da177e4SLinus Torvalds 314363c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3144664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 314563c70c4fSNeilBrown mddev->layout != mddev->new_layout || 314663c70c4fSNeilBrown mddev->level != mddev->new_level) { 3147664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 314863c70c4fSNeilBrown mddev->new_layout = mddev->layout; 314963c70c4fSNeilBrown mddev->new_level = mddev->level; 315063c70c4fSNeilBrown return -EINVAL; 315163c70c4fSNeilBrown } 315263c70c4fSNeilBrown 315328c1b9fdSGoldwyn Rodrigues if (!mddev_is_clustered(mddev)) { 3154b5470dc5SDan Williams err = md_allow_write(mddev); 3155b5470dc5SDan Williams if (err) 3156b5470dc5SDan Williams return err; 315728c1b9fdSGoldwyn Rodrigues } 31582a2275d6SNeilBrown 315963c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 316063c70c4fSNeilBrown 31616ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 31626ea9c07cSNeilBrown cnt=0; 31636ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 31641da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 31656ea9c07cSNeilBrown cnt++; 31666ea9c07cSNeilBrown if (cnt > raid_disks) 31671da177e4SLinus Torvalds return -EBUSY; 31686ea9c07cSNeilBrown } 31691da177e4SLinus Torvalds 31701da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 31711da177e4SLinus Torvalds if (!newpoolinfo) 31721da177e4SLinus Torvalds return -ENOMEM; 31731da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 31748f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 31751da177e4SLinus Torvalds 31761da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 31771da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 31781da177e4SLinus Torvalds if (!newpool) { 31791da177e4SLinus Torvalds kfree(newpoolinfo); 31801da177e4SLinus Torvalds return -ENOMEM; 31811da177e4SLinus Torvalds } 31820eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 31838f19ccb2SNeilBrown GFP_KERNEL); 31841da177e4SLinus Torvalds if (!newmirrors) { 31851da177e4SLinus Torvalds kfree(newpoolinfo); 31861da177e4SLinus Torvalds mempool_destroy(newpool); 31871da177e4SLinus Torvalds return -ENOMEM; 31881da177e4SLinus Torvalds } 31891da177e4SLinus Torvalds 3190e2d59925SNeilBrown freeze_array(conf, 0); 31911da177e4SLinus Torvalds 31921da177e4SLinus Torvalds /* ok, everything is stopped */ 31931da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 31941da177e4SLinus Torvalds conf->r1bio_pool = newpool; 31956ea9c07cSNeilBrown 3196a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 31973cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3198a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 319936fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3200a88aa786SNeilBrown rdev->raid_disk = d2; 320136fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 320236fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 32031d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 320436fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3205a88aa786SNeilBrown } 3206a88aa786SNeilBrown if (rdev) 3207a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 32086ea9c07cSNeilBrown } 32091da177e4SLinus Torvalds kfree(conf->mirrors); 32101da177e4SLinus Torvalds conf->mirrors = newmirrors; 32111da177e4SLinus Torvalds kfree(conf->poolinfo); 32121da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 32131da177e4SLinus Torvalds 3214c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 32151da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3216c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 32171da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 321863c70c4fSNeilBrown mddev->delta_disks = 0; 32191da177e4SLinus Torvalds 3220e2d59925SNeilBrown unfreeze_array(conf); 32211da177e4SLinus Torvalds 3222985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 32231da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32241da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds mempool_destroy(oldpool); 32271da177e4SLinus Torvalds return 0; 32281da177e4SLinus Torvalds } 32291da177e4SLinus Torvalds 3230fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 323136fa3063SNeilBrown { 3232e8096360SNeilBrown struct r1conf *conf = mddev->private; 323336fa3063SNeilBrown 323436fa3063SNeilBrown switch(state) { 32356eef4b21SNeilBrown case 2: /* wake for suspend */ 32366eef4b21SNeilBrown wake_up(&conf->wait_barrier); 32376eef4b21SNeilBrown break; 32389e6603daSNeilBrown case 1: 323907169fd4Smajianpeng freeze_array(conf, 0); 324036fa3063SNeilBrown break; 32419e6603daSNeilBrown case 0: 324207169fd4Smajianpeng unfreeze_array(conf); 324336fa3063SNeilBrown break; 324436fa3063SNeilBrown } 324536fa3063SNeilBrown } 324636fa3063SNeilBrown 3247fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3248709ae487SNeilBrown { 3249709ae487SNeilBrown /* raid1 can take over: 3250709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3251709ae487SNeilBrown */ 3252709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3253e8096360SNeilBrown struct r1conf *conf; 3254709ae487SNeilBrown mddev->new_level = 1; 3255709ae487SNeilBrown mddev->new_layout = 0; 3256709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3257709ae487SNeilBrown conf = setup_conf(mddev); 32586995f0b2SShaohua Li if (!IS_ERR(conf)) { 325907169fd4Smajianpeng /* Array must appear to be quiesced */ 326007169fd4Smajianpeng conf->array_frozen = 1; 3261394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3262394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 32636995f0b2SShaohua Li } 3264709ae487SNeilBrown return conf; 3265709ae487SNeilBrown } 3266709ae487SNeilBrown return ERR_PTR(-EINVAL); 3267709ae487SNeilBrown } 32681da177e4SLinus Torvalds 326984fc4b56SNeilBrown static struct md_personality raid1_personality = 32701da177e4SLinus Torvalds { 32711da177e4SLinus Torvalds .name = "raid1", 32722604b703SNeilBrown .level = 1, 32731da177e4SLinus Torvalds .owner = THIS_MODULE, 3274849674e4SShaohua Li .make_request = raid1_make_request, 3275849674e4SShaohua Li .run = raid1_run, 3276afa0f557SNeilBrown .free = raid1_free, 3277849674e4SShaohua Li .status = raid1_status, 3278849674e4SShaohua Li .error_handler = raid1_error, 32791da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 32801da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 32811da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3282849674e4SShaohua Li .sync_request = raid1_sync_request, 32831da177e4SLinus Torvalds .resize = raid1_resize, 328480c3a6ceSDan Williams .size = raid1_size, 328563c70c4fSNeilBrown .check_reshape = raid1_reshape, 328636fa3063SNeilBrown .quiesce = raid1_quiesce, 3287709ae487SNeilBrown .takeover = raid1_takeover, 32885c675f83SNeilBrown .congested = raid1_congested, 32891da177e4SLinus Torvalds }; 32901da177e4SLinus Torvalds 32911da177e4SLinus Torvalds static int __init raid_init(void) 32921da177e4SLinus Torvalds { 32932604b703SNeilBrown return register_md_personality(&raid1_personality); 32941da177e4SLinus Torvalds } 32951da177e4SLinus Torvalds 32961da177e4SLinus Torvalds static void raid_exit(void) 32971da177e4SLinus Torvalds { 32982604b703SNeilBrown unregister_md_personality(&raid1_personality); 32991da177e4SLinus Torvalds } 33001da177e4SLinus Torvalds 33011da177e4SLinus Torvalds module_init(raid_init); 33021da177e4SLinus Torvalds module_exit(raid_exit); 33031da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 33040efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 33051da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3306d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 33072604b703SNeilBrown MODULE_ALIAS("md-level-1"); 330834db0cd6SNeilBrown 330934db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3310