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 74fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr); 75fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr); 761da177e4SLinus Torvalds 77578b54adSNeilBrown #define raid1_log(md, fmt, args...) \ 78578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) 79578b54adSNeilBrown 80dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds struct pool_info *pi = data; 839f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 867eaceaccSJens Axboe return kzalloc(size, gfp_flags); 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds kfree(r1_bio); 921da177e4SLinus Torvalds } 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 958e005f7cSmajianpeng #define RESYNC_DEPTH 32 961da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 971da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 988e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 998e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 100c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 101c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 1021da177e4SLinus Torvalds 103dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds struct pool_info *pi = data; 1069f2c9d12SNeilBrown struct r1bio *r1_bio; 1071da177e4SLinus Torvalds struct bio *bio; 108da1aab3dSNeilBrown int need_pages; 1091da177e4SLinus Torvalds int i, j; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1127eaceaccSJens Axboe if (!r1_bio) 1131da177e4SLinus Torvalds return NULL; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* 1161da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1171da177e4SLinus Torvalds */ 1181da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1196746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1201da177e4SLinus Torvalds if (!bio) 1211da177e4SLinus Torvalds goto out_free_bio; 1221da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds /* 1251da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 126d11c171eSNeilBrown * the first bio. 127d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 128d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1291da177e4SLinus Torvalds */ 130d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 131da1aab3dSNeilBrown need_pages = pi->raid_disks; 132d11c171eSNeilBrown else 133da1aab3dSNeilBrown need_pages = 1; 134da1aab3dSNeilBrown for (j = 0; j < need_pages; j++) { 135d11c171eSNeilBrown bio = r1_bio->bios[j]; 136a0787606SKent Overstreet bio->bi_vcnt = RESYNC_PAGES; 1371da177e4SLinus Torvalds 138a0787606SKent Overstreet if (bio_alloc_pages(bio, gfp_flags)) 139da1aab3dSNeilBrown goto out_free_pages; 140d11c171eSNeilBrown } 141d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 142d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 143d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 144d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 145d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 146d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 147d11c171eSNeilBrown } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds return r1_bio; 1521da177e4SLinus Torvalds 153da1aab3dSNeilBrown out_free_pages: 154491221f8SGuoqing Jiang while (--j >= 0) 155491221f8SGuoqing Jiang bio_free_pages(r1_bio->bios[j]); 156da1aab3dSNeilBrown 1571da177e4SLinus Torvalds out_free_bio: 1581da177e4SLinus Torvalds while (++j < pi->raid_disks) 1591da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1601da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1611da177e4SLinus Torvalds return NULL; 1621da177e4SLinus Torvalds } 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds struct pool_info *pi = data; 167d11c171eSNeilBrown int i,j; 1689f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 1691da177e4SLinus Torvalds 170d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 171d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 172d11c171eSNeilBrown if (j == 0 || 173d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 174d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1751345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1761da177e4SLinus Torvalds } 1771da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1781da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 183e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 1841da177e4SLinus Torvalds { 1851da177e4SLinus Torvalds int i; 1861da177e4SLinus Torvalds 1878f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1881da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1894367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1901da177e4SLinus Torvalds bio_put(*bio); 1911da177e4SLinus Torvalds *bio = NULL; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds } 1941da177e4SLinus Torvalds 1959f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 1961da177e4SLinus Torvalds { 197e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 2001da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2039f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2041da177e4SLinus Torvalds { 205e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2063e198f78SNeilBrown int i; 2073e198f78SNeilBrown 2088f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2093e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2103e198f78SNeilBrown if (bio->bi_end_io) 2113e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2123e198f78SNeilBrown } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2151da177e4SLinus Torvalds 216fd76863eScolyli@suse.de lower_barrier(conf, r1_bio->sector); 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2199f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds unsigned long flags; 222fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 223e8096360SNeilBrown struct r1conf *conf = mddev->private; 224fd76863eScolyli@suse.de int idx; 2251da177e4SLinus Torvalds 226fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2271da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2281da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 229824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 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; 2464f024f37SKent Overstreet sector_t bi_sector = bio->bi_iter.bi_sector; 247d2eb35acSNeilBrown 248d2eb35acSNeilBrown if (bio->bi_phys_segments) { 249d2eb35acSNeilBrown unsigned long flags; 250d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 251d2eb35acSNeilBrown bio->bi_phys_segments--; 252d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 253d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25479ef3a8aSmajianpeng /* 25579ef3a8aSmajianpeng * make_request() might be waiting for 25679ef3a8aSmajianpeng * bi_phys_segments to decrease 25779ef3a8aSmajianpeng */ 25879ef3a8aSmajianpeng wake_up(&conf->wait_barrier); 259d2eb35acSNeilBrown } else 260d2eb35acSNeilBrown done = 1; 261d2eb35acSNeilBrown 262d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2634246a0b6SChristoph Hellwig bio->bi_error = -EIO; 2644246a0b6SChristoph Hellwig 265d2eb35acSNeilBrown if (done) { 2664246a0b6SChristoph Hellwig bio_endio(bio); 267d2eb35acSNeilBrown /* 268d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 269d2eb35acSNeilBrown * to go idle. 270d2eb35acSNeilBrown */ 271fd76863eScolyli@suse.de allow_barrier(conf, bi_sector); 272d2eb35acSNeilBrown } 273d2eb35acSNeilBrown } 274d2eb35acSNeilBrown 2759f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2781da177e4SLinus Torvalds 2794b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2804b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 28136a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2824b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2834f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 2844f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 2854b6d287fSNeilBrown 286d2eb35acSNeilBrown call_bio_endio(r1_bio); 2874b6d287fSNeilBrown } 2881da177e4SLinus Torvalds free_r1bio(r1_bio); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 2921da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2931da177e4SLinus Torvalds */ 2949f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 2951da177e4SLinus Torvalds { 296e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2991da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3001da177e4SLinus Torvalds } 3011da177e4SLinus Torvalds 302ba3ae3beSNamhyung Kim /* 303ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 304ba3ae3beSNamhyung Kim */ 3059f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 306ba3ae3beSNamhyung Kim { 307ba3ae3beSNamhyung Kim int mirror; 30830194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 30930194636SNeilBrown int raid_disks = conf->raid_disks; 310ba3ae3beSNamhyung Kim 3118f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 312ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 313ba3ae3beSNamhyung Kim break; 314ba3ae3beSNamhyung Kim 3158f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 316ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 317ba3ae3beSNamhyung Kim 318ba3ae3beSNamhyung Kim return mirror; 319ba3ae3beSNamhyung Kim } 320ba3ae3beSNamhyung Kim 3214246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3221da177e4SLinus Torvalds { 3234246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 3249f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 325e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 326e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds /* 3291da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3301da177e4SLinus Torvalds */ 331e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 332ddaf22abSNeilBrown 333220946c9SNeilBrown if (uptodate) 3341da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3352e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3362e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3372e52d449SNeilBrown /* This was a fail-fast read so we definitely 3382e52d449SNeilBrown * want to retry */ 3392e52d449SNeilBrown ; 340dd00a99eSNeilBrown else { 341dd00a99eSNeilBrown /* If all other devices have failed, we want to return 342dd00a99eSNeilBrown * the error upwards rather than fail the last device. 343dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 344dd00a99eSNeilBrown */ 345dd00a99eSNeilBrown unsigned long flags; 346dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 347dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 348dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 349e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 350dd00a99eSNeilBrown uptodate = 1; 351dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 352dd00a99eSNeilBrown } 3531da177e4SLinus Torvalds 3547ad4d4a6SNeilBrown if (uptodate) { 3551da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 356e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3577ad4d4a6SNeilBrown } else { 3581da177e4SLinus Torvalds /* 3591da177e4SLinus Torvalds * oops, read error: 3601da177e4SLinus Torvalds */ 3611da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3621d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 3639dd1e2faSNeilBrown mdname(conf->mddev), 3641d41c216SNeilBrown bdevname(rdev->bdev, b), 3658bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 366d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3671da177e4SLinus Torvalds reschedule_retry(r1_bio); 3687ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds } 3711da177e4SLinus Torvalds 3729f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3734e78064fSNeilBrown { 3744e78064fSNeilBrown /* it really is the end of this request */ 3754e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3764e78064fSNeilBrown /* free extra copy of the data pages */ 377af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3784e78064fSNeilBrown while (i--) 3792ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3802ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3812ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3824e78064fSNeilBrown } 3834e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3844e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3854e78064fSNeilBrown r1_bio->sectors, 3864e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 387af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3884e78064fSNeilBrown md_write_end(r1_bio->mddev); 389cd5ff9a1SNeilBrown } 390cd5ff9a1SNeilBrown 3919f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 392cd5ff9a1SNeilBrown { 393cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 394cd5ff9a1SNeilBrown return; 395cd5ff9a1SNeilBrown 396cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 397cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 398cd5ff9a1SNeilBrown else { 399cd5ff9a1SNeilBrown close_write(r1_bio); 4004367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4014367af55SNeilBrown reschedule_retry(r1_bio); 4024367af55SNeilBrown else 4034e78064fSNeilBrown raid_end_bio_io(r1_bio); 4044e78064fSNeilBrown } 4054e78064fSNeilBrown } 4064e78064fSNeilBrown 4074246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4081da177e4SLinus Torvalds { 4099f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 410e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 411e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 41204b857f7SNeilBrown struct bio *to_put = NULL; 413e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 414e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 415e3f948cdSShaohua Li bool discard_error; 416e3f948cdSShaohua Li 417e3f948cdSShaohua Li discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; 4181da177e4SLinus Torvalds 4191da177e4SLinus Torvalds /* 420e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4211da177e4SLinus Torvalds */ 422e3f948cdSShaohua Li if (bio->bi_error && !discard_error) { 423e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 424e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 42519d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 42619d67169SNeilBrown conf->mddev->recovery); 42719d67169SNeilBrown 428212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 429212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 430212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 431212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 432212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 433212e7eb7SNeilBrown if (!test_bit(Faulty, &rdev->flags)) 434212e7eb7SNeilBrown /* This is the only remaining device, 435212e7eb7SNeilBrown * We need to retry the write without 436212e7eb7SNeilBrown * FailFast 437212e7eb7SNeilBrown */ 438212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 439212e7eb7SNeilBrown else { 440212e7eb7SNeilBrown /* Finished with this branch */ 441212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 442212e7eb7SNeilBrown to_put = bio; 443212e7eb7SNeilBrown } 444212e7eb7SNeilBrown } else 445cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4464367af55SNeilBrown } else { 4471da177e4SLinus Torvalds /* 448e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 449e9c7469bSTejun Heo * will return a good error code for to the higher 450e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 451e9c7469bSTejun Heo * fails. 4521da177e4SLinus Torvalds * 453e9c7469bSTejun Heo * The 'master' represents the composite IO operation 454e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 455e9c7469bSTejun Heo * will wait for the 'master' bio. 4561da177e4SLinus Torvalds */ 4574367af55SNeilBrown sector_t first_bad; 4584367af55SNeilBrown int bad_sectors; 4594367af55SNeilBrown 460cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 461cd5ff9a1SNeilBrown to_put = bio; 4623056e3aeSAlex Lyakas /* 4633056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4643056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4653056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4663056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4673056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4683056e3aeSAlex Lyakas * check this here. 4693056e3aeSAlex Lyakas */ 470e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 471e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 4721da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4731da177e4SLinus Torvalds 4744367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 475e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 476e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 4774367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4784367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4794367af55SNeilBrown } 4804367af55SNeilBrown } 4814367af55SNeilBrown 4824b6d287fSNeilBrown if (behind) { 483e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 4844b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4854b6d287fSNeilBrown 486e9c7469bSTejun Heo /* 487e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 488e9c7469bSTejun Heo * has safely reached all non-writemostly 489e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 490e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 491e9c7469bSTejun Heo * -EIO here, instead we'll wait 492e9c7469bSTejun Heo */ 4934b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4944b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4954b6d287fSNeilBrown /* Maybe we can return now */ 4964b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4974b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 49836a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 49936a4e1feSNeilBrown " %llu-%llu\n", 5004f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5014f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 502d2eb35acSNeilBrown call_bio_endio(r1_bio); 5034b6d287fSNeilBrown } 5044b6d287fSNeilBrown } 5054b6d287fSNeilBrown } 5064367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 507e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 508e9c7469bSTejun Heo 5091da177e4SLinus Torvalds /* 5101da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5111da177e4SLinus Torvalds * already. 5121da177e4SLinus Torvalds */ 513af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 514c70810b3SNeilBrown 51504b857f7SNeilBrown if (to_put) 51604b857f7SNeilBrown bio_put(to_put); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 519fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 520fd76863eScolyli@suse.de sector_t sectors) 521fd76863eScolyli@suse.de { 522fd76863eScolyli@suse.de sector_t len; 523fd76863eScolyli@suse.de 524fd76863eScolyli@suse.de WARN_ON(sectors == 0); 525fd76863eScolyli@suse.de /* 526fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 527fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 528fd76863eScolyli@suse.de */ 529fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 530fd76863eScolyli@suse.de start_sector; 531fd76863eScolyli@suse.de 532fd76863eScolyli@suse.de if (len > sectors) 533fd76863eScolyli@suse.de len = sectors; 534fd76863eScolyli@suse.de 535fd76863eScolyli@suse.de return len; 536fd76863eScolyli@suse.de } 537fd76863eScolyli@suse.de 5381da177e4SLinus Torvalds /* 5391da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5401da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5411da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5421da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5431da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5441da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5451da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5461da177e4SLinus Torvalds * 5471da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5481da177e4SLinus Torvalds * because position is mirror, not device based. 5491da177e4SLinus Torvalds * 5501da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5511da177e4SLinus Torvalds */ 552e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5531da177e4SLinus Torvalds { 554af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 555d2eb35acSNeilBrown int sectors; 556d2eb35acSNeilBrown int best_good_sectors; 5579dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5589dedf603SShaohua Li int has_nonrot_disk; 559be4d3280SShaohua Li int disk; 56076073054SNeilBrown sector_t best_dist; 5619dedf603SShaohua Li unsigned int min_pending; 5623cb03002SNeilBrown struct md_rdev *rdev; 563f3ac8bf7SNeilBrown int choose_first; 56412cee5a8SShaohua Li int choose_next_idle; 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds rcu_read_lock(); 5671da177e4SLinus Torvalds /* 5688ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5691da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5701da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5711da177e4SLinus Torvalds */ 5721da177e4SLinus Torvalds retry: 573d2eb35acSNeilBrown sectors = r1_bio->sectors; 57476073054SNeilBrown best_disk = -1; 5759dedf603SShaohua Li best_dist_disk = -1; 57676073054SNeilBrown best_dist = MaxSector; 5779dedf603SShaohua Li best_pending_disk = -1; 5789dedf603SShaohua Li min_pending = UINT_MAX; 579d2eb35acSNeilBrown best_good_sectors = 0; 5809dedf603SShaohua Li has_nonrot_disk = 0; 58112cee5a8SShaohua Li choose_next_idle = 0; 5822e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 583d2eb35acSNeilBrown 5847d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 5857d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 58690382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 5877d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 5887d49ffcfSGoldwyn Rodrigues choose_first = 1; 5897d49ffcfSGoldwyn Rodrigues else 5907d49ffcfSGoldwyn Rodrigues choose_first = 0; 5911da177e4SLinus Torvalds 592be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 59376073054SNeilBrown sector_t dist; 594d2eb35acSNeilBrown sector_t first_bad; 595d2eb35acSNeilBrown int bad_sectors; 5969dedf603SShaohua Li unsigned int pending; 59712cee5a8SShaohua Li bool nonrot; 598d2eb35acSNeilBrown 599f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 600f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 601f3ac8bf7SNeilBrown || rdev == NULL 60276073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 603f3ac8bf7SNeilBrown continue; 60476073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 60576073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 60676073054SNeilBrown continue; 60776073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 60876073054SNeilBrown /* Don't balance among write-mostly, just 60976073054SNeilBrown * use the first as a last resort */ 610d1901ef0STomáš Hodek if (best_dist_disk < 0) { 611307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 612307729c8SNeilBrown &first_bad, &bad_sectors)) { 613816b0acfSWei Fang if (first_bad <= this_sector) 614307729c8SNeilBrown /* Cannot use this */ 615307729c8SNeilBrown continue; 616307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 617307729c8SNeilBrown } else 618307729c8SNeilBrown best_good_sectors = sectors; 619d1901ef0STomáš Hodek best_dist_disk = disk; 620d1901ef0STomáš Hodek best_pending_disk = disk; 621307729c8SNeilBrown } 62276073054SNeilBrown continue; 6238ddf9efeSNeilBrown } 62476073054SNeilBrown /* This is a reasonable device to use. It might 62576073054SNeilBrown * even be best. 6261da177e4SLinus Torvalds */ 627d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 628d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 629d2eb35acSNeilBrown if (best_dist < MaxSector) 630d2eb35acSNeilBrown /* already have a better device */ 631d2eb35acSNeilBrown continue; 632d2eb35acSNeilBrown if (first_bad <= this_sector) { 633d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 634d2eb35acSNeilBrown * device, then we must not read beyond 635d2eb35acSNeilBrown * bad_sectors from another device.. 636d2eb35acSNeilBrown */ 637d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 638d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 639d2eb35acSNeilBrown sectors = bad_sectors; 640d2eb35acSNeilBrown if (best_good_sectors > sectors) 641d2eb35acSNeilBrown best_good_sectors = sectors; 642d2eb35acSNeilBrown 643d2eb35acSNeilBrown } else { 644d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 645d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 646d2eb35acSNeilBrown best_good_sectors = good_sectors; 647d2eb35acSNeilBrown best_disk = disk; 648d2eb35acSNeilBrown } 649d2eb35acSNeilBrown if (choose_first) 650d2eb35acSNeilBrown break; 651d2eb35acSNeilBrown } 652d2eb35acSNeilBrown continue; 653d2eb35acSNeilBrown } else 654d2eb35acSNeilBrown best_good_sectors = sectors; 655d2eb35acSNeilBrown 6562e52d449SNeilBrown if (best_disk >= 0) 6572e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 6582e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 6592e52d449SNeilBrown 66012cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 66112cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6629dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 66376073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 66412cee5a8SShaohua Li if (choose_first) { 66576073054SNeilBrown best_disk = disk; 6661da177e4SLinus Torvalds break; 6671da177e4SLinus Torvalds } 66812cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 66912cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 67012cee5a8SShaohua Li || dist == 0) { 67112cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 67212cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 67312cee5a8SShaohua Li 67412cee5a8SShaohua Li best_disk = disk; 67512cee5a8SShaohua Li /* 67612cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 67712cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 67812cee5a8SShaohua Li * the idle disk. read_balance could already choose an 67912cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 68012cee5a8SShaohua Li * this disk. This doesn't matter because this disk 68112cee5a8SShaohua Li * will idle, next time it will be utilized after the 68212cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 68312cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 68412cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 68512cee5a8SShaohua Li * small, but not a big deal since when the second disk 68612cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 68712cee5a8SShaohua Li */ 68812cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 68912cee5a8SShaohua Li mirror->seq_start != MaxSector && 69012cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 69112cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 69212cee5a8SShaohua Li mirror->seq_start) { 69312cee5a8SShaohua Li choose_next_idle = 1; 69412cee5a8SShaohua Li continue; 69512cee5a8SShaohua Li } 69612cee5a8SShaohua Li break; 69712cee5a8SShaohua Li } 69812cee5a8SShaohua Li 69912cee5a8SShaohua Li if (choose_next_idle) 70012cee5a8SShaohua Li continue; 7019dedf603SShaohua Li 7029dedf603SShaohua Li if (min_pending > pending) { 7039dedf603SShaohua Li min_pending = pending; 7049dedf603SShaohua Li best_pending_disk = disk; 7059dedf603SShaohua Li } 7069dedf603SShaohua Li 70776073054SNeilBrown if (dist < best_dist) { 70876073054SNeilBrown best_dist = dist; 7099dedf603SShaohua Li best_dist_disk = disk; 7101da177e4SLinus Torvalds } 711f3ac8bf7SNeilBrown } 7121da177e4SLinus Torvalds 7139dedf603SShaohua Li /* 7149dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7159dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7169dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7179dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7189dedf603SShaohua Li */ 7199dedf603SShaohua Li if (best_disk == -1) { 7202e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7219dedf603SShaohua Li best_disk = best_pending_disk; 7229dedf603SShaohua Li else 7239dedf603SShaohua Li best_disk = best_dist_disk; 7249dedf603SShaohua Li } 7259dedf603SShaohua Li 72676073054SNeilBrown if (best_disk >= 0) { 72776073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7288ddf9efeSNeilBrown if (!rdev) 7298ddf9efeSNeilBrown goto retry; 7308ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 731d2eb35acSNeilBrown sectors = best_good_sectors; 73212cee5a8SShaohua Li 73312cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 73412cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 73512cee5a8SShaohua Li 736be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7371da177e4SLinus Torvalds } 7381da177e4SLinus Torvalds rcu_read_unlock(); 739d2eb35acSNeilBrown *max_sectors = sectors; 7401da177e4SLinus Torvalds 74176073054SNeilBrown return best_disk; 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7445c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7450d129228SNeilBrown { 746e8096360SNeilBrown struct r1conf *conf = mddev->private; 7470d129228SNeilBrown int i, ret = 0; 7480d129228SNeilBrown 7494452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 75034db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 75134db0cd6SNeilBrown return 1; 75234db0cd6SNeilBrown 7530d129228SNeilBrown rcu_read_lock(); 754f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7553cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7560d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 757165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7580d129228SNeilBrown 7591ed7242eSJonathan Brassow BUG_ON(!q); 7601ed7242eSJonathan Brassow 7610d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7620d129228SNeilBrown * non-congested targets, it can be removed 7630d129228SNeilBrown */ 7644452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 7650d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 7660d129228SNeilBrown else 7670d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 7680d129228SNeilBrown } 7690d129228SNeilBrown } 7700d129228SNeilBrown rcu_read_unlock(); 7710d129228SNeilBrown return ret; 7720d129228SNeilBrown } 7730d129228SNeilBrown 774e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 775a35e63efSNeilBrown { 776a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 777a35e63efSNeilBrown * bitmap updates get flushed here. 778a35e63efSNeilBrown */ 779a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 780a35e63efSNeilBrown 781a35e63efSNeilBrown if (conf->pending_bio_list.head) { 782a35e63efSNeilBrown struct bio *bio; 783a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 78434db0cd6SNeilBrown conf->pending_count = 0; 785a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 786a35e63efSNeilBrown /* flush any pending bitmap writes to 787a35e63efSNeilBrown * disk before proceeding w/ I/O */ 788a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 78934db0cd6SNeilBrown wake_up(&conf->wait_barrier); 790a35e63efSNeilBrown 791a35e63efSNeilBrown while (bio) { /* submit pending writes */ 792a35e63efSNeilBrown struct bio *next = bio->bi_next; 7935e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 794a35e63efSNeilBrown bio->bi_next = NULL; 7955e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 7965e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 7975e2c7a36SNeilBrown bio->bi_error = -EIO; 7985e2c7a36SNeilBrown bio_endio(bio); 7995e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 8002ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 8012ff8cc2cSShaohua Li /* Just ignore it */ 8024246a0b6SChristoph Hellwig bio_endio(bio); 8032ff8cc2cSShaohua Li else 804a35e63efSNeilBrown generic_make_request(bio); 805a35e63efSNeilBrown bio = next; 806a35e63efSNeilBrown } 807a35e63efSNeilBrown } else 808a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8097eaceaccSJens Axboe } 8107eaceaccSJens Axboe 81117999be4SNeilBrown /* Barriers.... 81217999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 81317999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 81417999be4SNeilBrown * To do this we raise a 'barrier'. 81517999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 81617999be4SNeilBrown * to count how many activities are happening which preclude 81717999be4SNeilBrown * normal IO. 81817999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 81917999be4SNeilBrown * i.e. if nr_pending == 0. 82017999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 82117999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 82217999be4SNeilBrown * is ready, no other operations which require a barrier will start 82317999be4SNeilBrown * until the IO request has had a chance. 82417999be4SNeilBrown * 82517999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 82617999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 82717999be4SNeilBrown * allow_barrier when it has finished its IO. 82817999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 82917999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 83017999be4SNeilBrown * lower_barrier when the particular background IO completes. 8311da177e4SLinus Torvalds */ 832c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 8331da177e4SLinus Torvalds { 834fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 835fd76863eScolyli@suse.de 8361da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8371da177e4SLinus Torvalds 83817999be4SNeilBrown /* Wait until no block IO is waiting */ 839824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 840824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 841eed8c02eSLukas Czerner conf->resync_lock); 84217999be4SNeilBrown 84317999be4SNeilBrown /* block any new IO from starting */ 844824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 845824e47daScolyli@suse.de /* 846824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 847824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 848824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 849824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 850824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 851824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 852824e47daScolyli@suse.de */ 853824e47daScolyli@suse.de smp_mb__after_atomic(); 85417999be4SNeilBrown 85579ef3a8aSmajianpeng /* For these conditions we must wait: 85679ef3a8aSmajianpeng * A: while the array is in frozen state 857fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 858fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 859fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 860fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 86179ef3a8aSmajianpeng */ 86217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 863b364e3d0Smajianpeng !conf->array_frozen && 864824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 865824e47daScolyli@suse.de atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, 866eed8c02eSLukas Czerner conf->resync_lock); 86717999be4SNeilBrown 868824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 8691da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8701da177e4SLinus Torvalds } 8711da177e4SLinus Torvalds 872fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 87317999be4SNeilBrown { 874fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 875fd76863eScolyli@suse.de 876824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 877fd76863eScolyli@suse.de 878824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 879824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 88017999be4SNeilBrown wake_up(&conf->wait_barrier); 88117999be4SNeilBrown } 88217999be4SNeilBrown 883fd76863eScolyli@suse.de static void _wait_barrier(struct r1conf *conf, int idx) 88417999be4SNeilBrown { 885824e47daScolyli@suse.de /* 886824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 887824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 888824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 889824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 890824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 891824e47daScolyli@suse.de * should be blocked until array is unfrozen. 892824e47daScolyli@suse.de */ 893824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 894824e47daScolyli@suse.de /* 895824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 896824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 897824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 898824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 899824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 900824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 901824e47daScolyli@suse.de */ 902824e47daScolyli@suse.de smp_mb__after_atomic(); 90379ef3a8aSmajianpeng 904824e47daScolyli@suse.de /* 905824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 906824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 907824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 908824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 909824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 910824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 911824e47daScolyli@suse.de * frozen_array(). 912824e47daScolyli@suse.de */ 913824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 914824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 915824e47daScolyli@suse.de return; 916824e47daScolyli@suse.de 917824e47daScolyli@suse.de /* 918824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 919824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 920824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 921824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 922824e47daScolyli@suse.de * to be 0 at same time. 923824e47daScolyli@suse.de */ 924824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 925824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 926824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 927824e47daScolyli@suse.de /* 928824e47daScolyli@suse.de * In case freeze_array() is waiting for 929824e47daScolyli@suse.de * get_unqueued_pending() == extra 930824e47daScolyli@suse.de */ 931824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 932824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 933824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 934824e47daScolyli@suse.de !conf->array_frozen && 935824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 936824e47daScolyli@suse.de conf->resync_lock); 937824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 938824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 939fd76863eScolyli@suse.de spin_unlock_irq(&conf->resync_lock); 94079ef3a8aSmajianpeng } 94179ef3a8aSmajianpeng 942fd76863eScolyli@suse.de static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) 94379ef3a8aSmajianpeng { 944fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 94579ef3a8aSmajianpeng 946824e47daScolyli@suse.de /* 947824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 948824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 949824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 950824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 951824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 952824e47daScolyli@suse.de */ 953824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 954824e47daScolyli@suse.de 955824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 956824e47daScolyli@suse.de return; 957824e47daScolyli@suse.de 95817999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 959824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 960824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 961824e47daScolyli@suse.de /* 962824e47daScolyli@suse.de * In case freeze_array() is waiting for 963824e47daScolyli@suse.de * get_unqueued_pending() == extra 964824e47daScolyli@suse.de */ 965824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 966824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 967824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 968fd76863eScolyli@suse.de !conf->array_frozen, 969eed8c02eSLukas Czerner conf->resync_lock); 970824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 971824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 97279ef3a8aSmajianpeng spin_unlock_irq(&conf->resync_lock); 97379ef3a8aSmajianpeng } 97479ef3a8aSmajianpeng 975fd76863eScolyli@suse.de static void wait_barrier(struct r1conf *conf, sector_t sector_nr) 976fd76863eScolyli@suse.de { 977fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 978fd76863eScolyli@suse.de 979fd76863eScolyli@suse.de _wait_barrier(conf, idx); 980fd76863eScolyli@suse.de } 981fd76863eScolyli@suse.de 982fd76863eScolyli@suse.de static void wait_all_barriers(struct r1conf *conf) 983fd76863eScolyli@suse.de { 984fd76863eScolyli@suse.de int idx; 985fd76863eScolyli@suse.de 986fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 987fd76863eScolyli@suse.de _wait_barrier(conf, idx); 988fd76863eScolyli@suse.de } 989fd76863eScolyli@suse.de 990fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 99117999be4SNeilBrown { 992824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 99317999be4SNeilBrown wake_up(&conf->wait_barrier); 99417999be4SNeilBrown } 99517999be4SNeilBrown 996fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 997fd76863eScolyli@suse.de { 998fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 999fd76863eScolyli@suse.de 1000fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1001fd76863eScolyli@suse.de } 1002fd76863eScolyli@suse.de 1003fd76863eScolyli@suse.de static void allow_all_barriers(struct r1conf *conf) 1004fd76863eScolyli@suse.de { 1005fd76863eScolyli@suse.de int idx; 1006fd76863eScolyli@suse.de 1007fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1008fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1009fd76863eScolyli@suse.de } 1010fd76863eScolyli@suse.de 1011fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1012fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1013fd76863eScolyli@suse.de { 1014fd76863eScolyli@suse.de int idx, ret; 1015fd76863eScolyli@suse.de 1016fd76863eScolyli@suse.de for (ret = 0, idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1017824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1018824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1019fd76863eScolyli@suse.de 1020fd76863eScolyli@suse.de return ret; 1021fd76863eScolyli@suse.de } 1022fd76863eScolyli@suse.de 1023e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1024ddaf22abSNeilBrown { 1025fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 1026ddaf22abSNeilBrown * go quite. 1027fd76863eScolyli@suse.de * This is called in two situations: 1028fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1029fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1030fd76863eScolyli@suse.de 1031fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1032fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1033fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1034fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1035fd76863eScolyli@suse.de 1036fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1037fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1038fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1039fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1040fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1041fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1042fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1043fd76863eScolyli@suse.de * 1044fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1045fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1046fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1047ddaf22abSNeilBrown */ 1048ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1049b364e3d0Smajianpeng conf->array_frozen = 1; 1050578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1051fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1052fd76863eScolyli@suse.de conf->wait_barrier, 1053fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1054ddaf22abSNeilBrown conf->resync_lock, 1055c3b328acSNeilBrown flush_pending_writes(conf)); 1056ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1057ddaf22abSNeilBrown } 1058e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1059ddaf22abSNeilBrown { 1060ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1061ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1062b364e3d0Smajianpeng conf->array_frozen = 0; 1063ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1064824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1065ddaf22abSNeilBrown } 1066ddaf22abSNeilBrown 10674e78064fSNeilBrown /* duplicate the data pages for behind I/O 10684e78064fSNeilBrown */ 10699f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 10704b6d287fSNeilBrown { 10714b6d287fSNeilBrown int i; 10724b6d287fSNeilBrown struct bio_vec *bvec; 10732ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 10744b6d287fSNeilBrown GFP_NOIO); 10752ca68f5eSNeilBrown if (unlikely(!bvecs)) 1076af6d7b76SNeilBrown return; 10774b6d287fSNeilBrown 1078cb34e057SKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 10792ca68f5eSNeilBrown bvecs[i] = *bvec; 10802ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 10812ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 10824b6d287fSNeilBrown goto do_sync_io; 10832ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 10844b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 10852ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 10864b6d287fSNeilBrown kunmap(bvec->bv_page); 10874b6d287fSNeilBrown } 10882ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 1089af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 1090af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 1091af6d7b76SNeilBrown return; 10924b6d287fSNeilBrown 10934b6d287fSNeilBrown do_sync_io: 1094af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 10952ca68f5eSNeilBrown if (bvecs[i].bv_page) 10962ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 10972ca68f5eSNeilBrown kfree(bvecs); 10984f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 10994f024f37SKent Overstreet bio->bi_iter.bi_size); 11004b6d287fSNeilBrown } 11014b6d287fSNeilBrown 1102f54a9d0eSNeilBrown struct raid1_plug_cb { 1103f54a9d0eSNeilBrown struct blk_plug_cb cb; 1104f54a9d0eSNeilBrown struct bio_list pending; 1105f54a9d0eSNeilBrown int pending_cnt; 1106f54a9d0eSNeilBrown }; 1107f54a9d0eSNeilBrown 1108f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1109f54a9d0eSNeilBrown { 1110f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1111f54a9d0eSNeilBrown cb); 1112f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1113f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1114f54a9d0eSNeilBrown struct bio *bio; 1115f54a9d0eSNeilBrown 1116874807a8SNeilBrown if (from_schedule || current->bio_list) { 1117f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1118f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1119f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1120f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1121ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1122f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1123f54a9d0eSNeilBrown kfree(plug); 1124f54a9d0eSNeilBrown return; 1125f54a9d0eSNeilBrown } 1126f54a9d0eSNeilBrown 1127f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1128f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1129f54a9d0eSNeilBrown bitmap_unplug(mddev->bitmap); 1130f54a9d0eSNeilBrown wake_up(&conf->wait_barrier); 1131f54a9d0eSNeilBrown 1132f54a9d0eSNeilBrown while (bio) { /* submit pending writes */ 1133f54a9d0eSNeilBrown struct bio *next = bio->bi_next; 11345e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 1135f54a9d0eSNeilBrown bio->bi_next = NULL; 11365e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 11375e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 11385e2c7a36SNeilBrown bio->bi_error = -EIO; 11395e2c7a36SNeilBrown bio_endio(bio); 11405e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 114132f9f570SShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 114232f9f570SShaohua Li /* Just ignore it */ 11434246a0b6SChristoph Hellwig bio_endio(bio); 114432f9f570SShaohua Li else 1145f54a9d0eSNeilBrown generic_make_request(bio); 1146f54a9d0eSNeilBrown bio = next; 1147f54a9d0eSNeilBrown } 1148f54a9d0eSNeilBrown kfree(plug); 1149f54a9d0eSNeilBrown } 1150f54a9d0eSNeilBrown 1151fd76863eScolyli@suse.de static inline struct r1bio * 1152fd76863eScolyli@suse.de alloc_r1bio(struct mddev *mddev, struct bio *bio, sector_t sectors_handled) 1153fd76863eScolyli@suse.de { 1154fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1155fd76863eScolyli@suse.de struct r1bio *r1_bio; 1156fd76863eScolyli@suse.de 1157fd76863eScolyli@suse.de r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1158fd76863eScolyli@suse.de 1159fd76863eScolyli@suse.de r1_bio->master_bio = bio; 1160fd76863eScolyli@suse.de r1_bio->sectors = bio_sectors(bio) - sectors_handled; 1161fd76863eScolyli@suse.de r1_bio->state = 0; 1162fd76863eScolyli@suse.de r1_bio->mddev = mddev; 1163fd76863eScolyli@suse.de r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 1164fd76863eScolyli@suse.de 1165fd76863eScolyli@suse.de return r1_bio; 1166fd76863eScolyli@suse.de } 1167fd76863eScolyli@suse.de 1168fd76863eScolyli@suse.de static void raid1_read_request(struct mddev *mddev, struct bio *bio) 11691da177e4SLinus Torvalds { 1170e8096360SNeilBrown struct r1conf *conf = mddev->private; 11710eaf822cSJonathan Brassow struct raid1_info *mirror; 1172fd76863eScolyli@suse.de struct r1bio *r1_bio; 11731da177e4SLinus Torvalds struct bio *read_bio; 11743b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1175796a5cf0SMike Christie const int op = bio_op(bio); 11761eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 11771f68f0c4SNeilBrown int sectors_handled; 11781f68f0c4SNeilBrown int max_sectors; 1179d2eb35acSNeilBrown int rdisk; 1180d2eb35acSNeilBrown 1181fd76863eScolyli@suse.de /* 1182fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1183fd76863eScolyli@suse.de * array is frozen. 1184fd76863eScolyli@suse.de */ 1185fd76863eScolyli@suse.de wait_read_barrier(conf, bio->bi_iter.bi_sector); 11863b046a97SRobert LeBlanc 1187fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, 0); 1188fd76863eScolyli@suse.de 1189fd76863eScolyli@suse.de /* 1190fd76863eScolyli@suse.de * We might need to issue multiple reads to different 1191fd76863eScolyli@suse.de * devices if there are bad blocks around, so we keep 1192fd76863eScolyli@suse.de * track of the number of reads in bio->bi_phys_segments. 1193fd76863eScolyli@suse.de * If this is 0, there is only one r1_bio and no locking 1194fd76863eScolyli@suse.de * will be needed when requests complete. If it is 1195fd76863eScolyli@suse.de * non-zero, then it is the number of not-completed requests. 1196fd76863eScolyli@suse.de */ 1197fd76863eScolyli@suse.de bio->bi_phys_segments = 0; 1198fd76863eScolyli@suse.de bio_clear_flag(bio, BIO_SEG_VALID); 1199fd76863eScolyli@suse.de 1200fd76863eScolyli@suse.de /* 1201fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1202fd76863eScolyli@suse.de * used and no empty request is available. 1203fd76863eScolyli@suse.de */ 1204d2eb35acSNeilBrown read_again: 1205d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds if (rdisk < 0) { 12081da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 12091da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12105a7bbad2SChristoph Hellwig return; 12111da177e4SLinus Torvalds } 12121da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12131da177e4SLinus Torvalds 1214e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1215e555190dSNeilBrown bitmap) { 12163b046a97SRobert LeBlanc /* 12173b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12183b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1219e555190dSNeilBrown */ 1220578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1221e555190dSNeilBrown wait_event(bitmap->behind_wait, 1222e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1223e555190dSNeilBrown } 12241da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 12251da177e4SLinus Torvalds 1226d7a10308SMing Lei read_bio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); 12274f024f37SKent Overstreet bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, 1228d2eb35acSNeilBrown max_sectors); 12291da177e4SLinus Torvalds 12301da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 12311da177e4SLinus Torvalds 12324f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 12334f024f37SKent Overstreet mirror->rdev->data_offset; 12341da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 12351da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1236796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 12372e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 12382e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 12392e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 12401da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 12411da177e4SLinus Torvalds 1242109e3765SNeilBrown if (mddev->gendisk) 1243109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), 1244109e3765SNeilBrown read_bio, disk_devt(mddev->gendisk), 1245109e3765SNeilBrown r1_bio->sector); 1246109e3765SNeilBrown 1247d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 12483b046a97SRobert LeBlanc /* 12493b046a97SRobert LeBlanc * could not read all from this device, so we will need another 12503b046a97SRobert LeBlanc * r1_bio. 1251d2eb35acSNeilBrown */ 1252d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 12534f024f37SKent Overstreet - bio->bi_iter.bi_sector); 1254d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 1255d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 1256d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 1257d2eb35acSNeilBrown bio->bi_phys_segments = 2; 1258d2eb35acSNeilBrown else 1259d2eb35acSNeilBrown bio->bi_phys_segments++; 1260d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 12613b046a97SRobert LeBlanc 12623b046a97SRobert LeBlanc /* 12633b046a97SRobert LeBlanc * Cannot call generic_make_request directly as that will be 12643b046a97SRobert LeBlanc * queued in __make_request and subsequent mempool_alloc might 12653b046a97SRobert LeBlanc * block waiting for it. So hand bio over to raid1d. 1266d2eb35acSNeilBrown */ 1267d2eb35acSNeilBrown reschedule_retry(r1_bio); 1268d2eb35acSNeilBrown 1269fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, sectors_handled); 1270d2eb35acSNeilBrown goto read_again; 1271d2eb35acSNeilBrown } else 12721da177e4SLinus Torvalds generic_make_request(read_bio); 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds 1275fd76863eScolyli@suse.de static void raid1_write_request(struct mddev *mddev, struct bio *bio) 12763b046a97SRobert LeBlanc { 12773b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1278fd76863eScolyli@suse.de struct r1bio *r1_bio; 12793b046a97SRobert LeBlanc int i, disks; 12803b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 12813b046a97SRobert LeBlanc unsigned long flags; 12823b046a97SRobert LeBlanc const int op = bio_op(bio); 12833b046a97SRobert LeBlanc const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 12843b046a97SRobert LeBlanc const unsigned long do_flush_fua = (bio->bi_opf & 12853b046a97SRobert LeBlanc (REQ_PREFLUSH | REQ_FUA)); 12863b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 12873b046a97SRobert LeBlanc struct blk_plug_cb *cb; 12883b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 12893b046a97SRobert LeBlanc int first_clone; 12903b046a97SRobert LeBlanc int sectors_handled; 12913b046a97SRobert LeBlanc int max_sectors; 12923b046a97SRobert LeBlanc 12931da177e4SLinus Torvalds /* 12943b046a97SRobert LeBlanc * Register the new request and wait if the reconstruction 12953b046a97SRobert LeBlanc * thread has put up a bar for new requests. 12963b046a97SRobert LeBlanc * Continue immediately if no resync is active currently. 12971da177e4SLinus Torvalds */ 12983b046a97SRobert LeBlanc 12993b046a97SRobert LeBlanc md_write_start(mddev, bio); /* wait on superblock update early */ 13003b046a97SRobert LeBlanc 13013b046a97SRobert LeBlanc if ((bio_end_sector(bio) > mddev->suspend_lo && 13023b046a97SRobert LeBlanc bio->bi_iter.bi_sector < mddev->suspend_hi) || 13033b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13043b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 13053b046a97SRobert LeBlanc bio->bi_iter.bi_sector, bio_end_sector(bio)))) { 13063b046a97SRobert LeBlanc 13073b046a97SRobert LeBlanc /* 13083b046a97SRobert LeBlanc * As the suspend_* range is controlled by userspace, we want 13093b046a97SRobert LeBlanc * an interruptible wait. 13103b046a97SRobert LeBlanc */ 13113b046a97SRobert LeBlanc DEFINE_WAIT(w); 13123b046a97SRobert LeBlanc for (;;) { 13133b046a97SRobert LeBlanc flush_signals(current); 13143b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 13153b046a97SRobert LeBlanc &w, TASK_INTERRUPTIBLE); 13163b046a97SRobert LeBlanc if (bio_end_sector(bio) <= mddev->suspend_lo || 13173b046a97SRobert LeBlanc bio->bi_iter.bi_sector >= mddev->suspend_hi || 13183b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13193b046a97SRobert LeBlanc !md_cluster_ops->area_resyncing(mddev, WRITE, 13203b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 13213b046a97SRobert LeBlanc bio_end_sector(bio)))) 13223b046a97SRobert LeBlanc break; 13233b046a97SRobert LeBlanc schedule(); 13243b046a97SRobert LeBlanc } 13253b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13263b046a97SRobert LeBlanc } 1327fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 1328fd76863eScolyli@suse.de 1329fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, 0); 1330fd76863eScolyli@suse.de 1331fd76863eScolyli@suse.de /* We might need to issue multiple writes to different 1332fd76863eScolyli@suse.de * devices if there are bad blocks around, so we keep 1333fd76863eScolyli@suse.de * track of the number of writes in bio->bi_phys_segments. 1334fd76863eScolyli@suse.de * If this is 0, there is only one r1_bio and no locking 1335fd76863eScolyli@suse.de * will be needed when requests complete. If it is 1336fd76863eScolyli@suse.de * non-zero, then it is the number of not-completed requests. 1337fd76863eScolyli@suse.de */ 1338fd76863eScolyli@suse.de bio->bi_phys_segments = 0; 1339fd76863eScolyli@suse.de bio_clear_flag(bio, BIO_SEG_VALID); 13403b046a97SRobert LeBlanc 134134db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 134234db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1343578b54adSNeilBrown raid1_log(mddev, "wait queued"); 134434db0cd6SNeilBrown wait_event(conf->wait_barrier, 134534db0cd6SNeilBrown conf->pending_count < max_queued_requests); 134634db0cd6SNeilBrown } 13471f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13481da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13491da177e4SLinus Torvalds * bios[x] to bio 13501f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13511f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13521f68f0c4SNeilBrown * blocks. 13531f68f0c4SNeilBrown * This potentially requires several writes to write around 13541f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13551f68f0c4SNeilBrown * with a set of bios attached. 13561da177e4SLinus Torvalds */ 1357c3b328acSNeilBrown 13588f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13596bfe0b49SDan Williams retry_write: 13606bfe0b49SDan Williams blocked_rdev = NULL; 13611da177e4SLinus Torvalds rcu_read_lock(); 13621f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 13631da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13643cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 13656bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 13666bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 13676bfe0b49SDan Williams blocked_rdev = rdev; 13686bfe0b49SDan Williams break; 13696bfe0b49SDan Williams } 13701da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 13718ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 13728f19ccb2SNeilBrown if (i < conf->raid_disks) 13731f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 13741f68f0c4SNeilBrown continue; 1375964147d5SNeilBrown } 13761f68f0c4SNeilBrown 13771f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 13781f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 13791f68f0c4SNeilBrown sector_t first_bad; 13801f68f0c4SNeilBrown int bad_sectors; 13811f68f0c4SNeilBrown int is_bad; 13821f68f0c4SNeilBrown 13833b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 13841f68f0c4SNeilBrown &first_bad, &bad_sectors); 13851f68f0c4SNeilBrown if (is_bad < 0) { 13861f68f0c4SNeilBrown /* mustn't write here until the bad block is 13871f68f0c4SNeilBrown * acknowledged*/ 13881f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 13891f68f0c4SNeilBrown blocked_rdev = rdev; 13901f68f0c4SNeilBrown break; 13911f68f0c4SNeilBrown } 13921f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 13931f68f0c4SNeilBrown /* Cannot write here at all */ 13941f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 13951f68f0c4SNeilBrown if (bad_sectors < max_sectors) 13961f68f0c4SNeilBrown /* mustn't write more than bad_sectors 13971f68f0c4SNeilBrown * to other devices yet 13981f68f0c4SNeilBrown */ 13991f68f0c4SNeilBrown max_sectors = bad_sectors; 14001f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14011f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14021f68f0c4SNeilBrown * only applies if the disk is 14031f68f0c4SNeilBrown * missing, so it might be re-added, 14041f68f0c4SNeilBrown * and we want to know to recover this 14051f68f0c4SNeilBrown * chunk. 14061f68f0c4SNeilBrown * In this case the device is here, 14071f68f0c4SNeilBrown * and the fact that this chunk is not 14081f68f0c4SNeilBrown * in-sync is recorded in the bad 14091f68f0c4SNeilBrown * block log 14101f68f0c4SNeilBrown */ 14111f68f0c4SNeilBrown continue; 14121f68f0c4SNeilBrown } 14131f68f0c4SNeilBrown if (is_bad) { 14141f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14151f68f0c4SNeilBrown if (good_sectors < max_sectors) 14161f68f0c4SNeilBrown max_sectors = good_sectors; 14171f68f0c4SNeilBrown } 14181f68f0c4SNeilBrown } 14191f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14201da177e4SLinus Torvalds } 14211da177e4SLinus Torvalds rcu_read_unlock(); 14221da177e4SLinus Torvalds 14236bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14246bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14256bfe0b49SDan Williams int j; 14266bfe0b49SDan Williams 14276bfe0b49SDan Williams for (j = 0; j < i; j++) 14286bfe0b49SDan Williams if (r1_bio->bios[j]) 14296bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14301f68f0c4SNeilBrown r1_bio->state = 0; 1431fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 1432578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14336bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 1434fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 14356bfe0b49SDan Williams goto retry_write; 14366bfe0b49SDan Williams } 14376bfe0b49SDan Williams 14381f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 14391f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 14401f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 14411f68f0c4SNeilBrown */ 14421f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 14431f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 14441f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 14451f68f0c4SNeilBrown bio->bi_phys_segments = 2; 14461f68f0c4SNeilBrown else 14471f68f0c4SNeilBrown bio->bi_phys_segments++; 14481f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1449191ea9b2SNeilBrown } 14504f024f37SKent Overstreet sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; 14514b6d287fSNeilBrown 14524e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 14534b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1454191ea9b2SNeilBrown 14551f68f0c4SNeilBrown first_clone = 1; 14561da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14578e58e327SMing Lei struct bio *mbio = NULL; 14588e58e327SMing Lei sector_t offset; 14591da177e4SLinus Torvalds if (!r1_bio->bios[i]) 14601da177e4SLinus Torvalds continue; 14611da177e4SLinus Torvalds 14628e58e327SMing Lei offset = r1_bio->sector - bio->bi_iter.bi_sector; 14631da177e4SLinus Torvalds 14641f68f0c4SNeilBrown if (first_clone) { 14651f68f0c4SNeilBrown /* do behind I/O ? 14661f68f0c4SNeilBrown * Not if there are too many, or cannot 14671f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 14681f68f0c4SNeilBrown * is waiting for behind writes to flush */ 14691f68f0c4SNeilBrown if (bitmap && 14701f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 14711f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 14728e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 14738e58e327SMing Lei mbio = bio_clone_bioset_partial(bio, GFP_NOIO, 14748e58e327SMing Lei mddev->bio_set, 14758e58e327SMing Lei offset, 14768e58e327SMing Lei max_sectors); 14771f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 14788e58e327SMing Lei } 14791da177e4SLinus Torvalds 14801f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 14811f68f0c4SNeilBrown r1_bio->sectors, 14821f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 14831f68f0c4SNeilBrown &r1_bio->state)); 14841f68f0c4SNeilBrown first_clone = 0; 14851f68f0c4SNeilBrown } 14868e58e327SMing Lei 14878e58e327SMing Lei if (!mbio) { 1488d7a10308SMing Lei mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); 14898e58e327SMing Lei bio_trim(mbio, offset, max_sectors); 14908e58e327SMing Lei } 14918e58e327SMing Lei 14922ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 14934b6d287fSNeilBrown struct bio_vec *bvec; 14944b6d287fSNeilBrown int j; 14954b6d287fSNeilBrown 1496cb34e057SKent Overstreet /* 1497cb34e057SKent Overstreet * We trimmed the bio, so _all is legit 14984b6d287fSNeilBrown */ 1499d74c6d51SKent Overstreet bio_for_each_segment_all(bvec, mbio, j) 15002ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 15014b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 15024b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 15034b6d287fSNeilBrown } 15044b6d287fSNeilBrown 15051f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 15061f68f0c4SNeilBrown 15074f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 15081f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 1509109e3765SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 15101f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1511288dab8aSChristoph Hellwig bio_set_op_attrs(mbio, op, do_flush_fua | do_sync); 1512212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1513212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1514212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1515212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15161f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15171f68f0c4SNeilBrown 15181da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1519f54a9d0eSNeilBrown 1520109e3765SNeilBrown if (mddev->gendisk) 1521109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), 1522109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1523109e3765SNeilBrown r1_bio->sector); 1524109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1525109e3765SNeilBrown mbio->bi_bdev = (void*)conf->mirrors[i].rdev; 1526109e3765SNeilBrown 1527f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1528f54a9d0eSNeilBrown if (cb) 1529f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1530f54a9d0eSNeilBrown else 1531f54a9d0eSNeilBrown plug = NULL; 1532191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1533f54a9d0eSNeilBrown if (plug) { 1534f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1535f54a9d0eSNeilBrown plug->pending_cnt++; 1536f54a9d0eSNeilBrown } else { 15374e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 153834db0cd6SNeilBrown conf->pending_count++; 1539f54a9d0eSNeilBrown } 1540191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1541f54a9d0eSNeilBrown if (!plug) 1542b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15434e78064fSNeilBrown } 1544079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1545079fa166SNeilBrown * as it could result in the bio being freed. 1546079fa166SNeilBrown */ 1547aa8b57aaSKent Overstreet if (sectors_handled < bio_sectors(bio)) { 1548079fa166SNeilBrown r1_bio_write_done(r1_bio); 15491f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 15501f68f0c4SNeilBrown * in bio->bi_phys_segments 15511f68f0c4SNeilBrown */ 1552fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, sectors_handled); 15531f68f0c4SNeilBrown goto retry_write; 15541f68f0c4SNeilBrown } 15551f68f0c4SNeilBrown 1556079fa166SNeilBrown r1_bio_write_done(r1_bio); 1557079fa166SNeilBrown 1558079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1559079fa166SNeilBrown wake_up(&conf->wait_barrier); 15601da177e4SLinus Torvalds } 15611da177e4SLinus Torvalds 15623b046a97SRobert LeBlanc static void raid1_make_request(struct mddev *mddev, struct bio *bio) 15633b046a97SRobert LeBlanc { 1564fd76863eScolyli@suse.de struct bio *split; 1565fd76863eScolyli@suse.de sector_t sectors; 15663b046a97SRobert LeBlanc 1567fd76863eScolyli@suse.de /* if bio exceeds barrier unit boundary, split it */ 1568fd76863eScolyli@suse.de do { 1569fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1570fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 1571fd76863eScolyli@suse.de if (sectors < bio_sectors(bio)) { 1572fd76863eScolyli@suse.de split = bio_split(bio, sectors, GFP_NOIO, fs_bio_set); 1573fd76863eScolyli@suse.de bio_chain(split, bio); 1574fd76863eScolyli@suse.de } else { 1575fd76863eScolyli@suse.de split = bio; 1576fd76863eScolyli@suse.de } 15773b046a97SRobert LeBlanc 1578fd76863eScolyli@suse.de if (bio_data_dir(split) == READ) 1579fd76863eScolyli@suse.de raid1_read_request(mddev, split); 15803b046a97SRobert LeBlanc else 1581fd76863eScolyli@suse.de raid1_write_request(mddev, split); 1582fd76863eScolyli@suse.de } while (split != bio); 15833b046a97SRobert LeBlanc } 15843b046a97SRobert LeBlanc 1585849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 15861da177e4SLinus Torvalds { 1587e8096360SNeilBrown struct r1conf *conf = mddev->private; 15881da177e4SLinus Torvalds int i; 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 159111ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1592ddac7c7eSNeilBrown rcu_read_lock(); 1593ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 15943cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 15951da177e4SLinus Torvalds seq_printf(seq, "%s", 1596ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1597ddac7c7eSNeilBrown } 1598ddac7c7eSNeilBrown rcu_read_unlock(); 15991da177e4SLinus Torvalds seq_printf(seq, "]"); 16001da177e4SLinus Torvalds } 16011da177e4SLinus Torvalds 1602849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 16031da177e4SLinus Torvalds { 16041da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1605e8096360SNeilBrown struct r1conf *conf = mddev->private; 1606423f04d6SNeilBrown unsigned long flags; 16071da177e4SLinus Torvalds 16081da177e4SLinus Torvalds /* 16091da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 16101da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 16111da177e4SLinus Torvalds * next level up know. 16121da177e4SLinus Torvalds * else mark the drive as failed 16131da177e4SLinus Torvalds */ 16142e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1615b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 16164044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 16171da177e4SLinus Torvalds /* 16181da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 16194044ba58SNeilBrown * normal single drive. 16204044ba58SNeilBrown * However don't try a recovery from this drive as 16214044ba58SNeilBrown * it is very likely to fail. 16221da177e4SLinus Torvalds */ 16235389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16242e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16251da177e4SLinus Torvalds return; 16264044ba58SNeilBrown } 1627de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1628423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 16291da177e4SLinus Torvalds mddev->degraded++; 1630dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 16312446dba0SNeilBrown } else 16322446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1633423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16341da177e4SLinus Torvalds /* 16351da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16361da177e4SLinus Torvalds */ 1637dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16382953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16392953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 16401d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1641067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 16429dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 16439dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16441da177e4SLinus Torvalds } 16451da177e4SLinus Torvalds 1646e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16471da177e4SLinus Torvalds { 16481da177e4SLinus Torvalds int i; 16491da177e4SLinus Torvalds 16501d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16511da177e4SLinus Torvalds if (!conf) { 16521d41c216SNeilBrown pr_debug("(!conf)\n"); 16531da177e4SLinus Torvalds return; 16541da177e4SLinus Torvalds } 16551d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16561da177e4SLinus Torvalds conf->raid_disks); 16571da177e4SLinus Torvalds 1658ddac7c7eSNeilBrown rcu_read_lock(); 16591da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16601da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 16613cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1662ddac7c7eSNeilBrown if (rdev) 16631d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1664ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1665ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1666ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 16671da177e4SLinus Torvalds } 1668ddac7c7eSNeilBrown rcu_read_unlock(); 16691da177e4SLinus Torvalds } 16701da177e4SLinus Torvalds 1671e8096360SNeilBrown static void close_sync(struct r1conf *conf) 16721da177e4SLinus Torvalds { 1673fd76863eScolyli@suse.de wait_all_barriers(conf); 1674fd76863eScolyli@suse.de allow_all_barriers(conf); 16751da177e4SLinus Torvalds 16761da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 16771da177e4SLinus Torvalds conf->r1buf_pool = NULL; 16781da177e4SLinus Torvalds } 16791da177e4SLinus Torvalds 1680fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 16811da177e4SLinus Torvalds { 16821da177e4SLinus Torvalds int i; 1683e8096360SNeilBrown struct r1conf *conf = mddev->private; 16846b965620SNeilBrown int count = 0; 16856b965620SNeilBrown unsigned long flags; 16861da177e4SLinus Torvalds 16871da177e4SLinus Torvalds /* 16881da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1689ddac7c7eSNeilBrown * and mark them readable. 1690ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1691423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1692423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 16931da177e4SLinus Torvalds */ 1694423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16951da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16963cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 16978c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 16988c7a2c2bSNeilBrown if (repl 16991aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 17008c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 17018c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 17028c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 17038c7a2c2bSNeilBrown /* replacement has just become active */ 17048c7a2c2bSNeilBrown if (!rdev || 17058c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 17068c7a2c2bSNeilBrown count++; 17078c7a2c2bSNeilBrown if (rdev) { 17088c7a2c2bSNeilBrown /* Replaced device not technically 17098c7a2c2bSNeilBrown * faulty, but we need to be sure 17108c7a2c2bSNeilBrown * it gets removed and never re-added 17118c7a2c2bSNeilBrown */ 17128c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 17138c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 17148c7a2c2bSNeilBrown rdev->sysfs_state); 17158c7a2c2bSNeilBrown } 17168c7a2c2bSNeilBrown } 1717ddac7c7eSNeilBrown if (rdev 171861e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1719ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1720c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17216b965620SNeilBrown count++; 1722654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17231da177e4SLinus Torvalds } 17241da177e4SLinus Torvalds } 17256b965620SNeilBrown mddev->degraded -= count; 17266b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17271da177e4SLinus Torvalds 17281da177e4SLinus Torvalds print_conf(conf); 17296b965620SNeilBrown return count; 17301da177e4SLinus Torvalds } 17311da177e4SLinus Torvalds 1732fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17331da177e4SLinus Torvalds { 1734e8096360SNeilBrown struct r1conf *conf = mddev->private; 1735199050eaSNeil Brown int err = -EEXIST; 173641158c7eSNeilBrown int mirror = 0; 17370eaf822cSJonathan Brassow struct raid1_info *p; 17386c2fce2eSNeil Brown int first = 0; 173930194636SNeilBrown int last = conf->raid_disks - 1; 17401da177e4SLinus Torvalds 17415389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17425389042fSNeilBrown return -EBUSY; 17435389042fSNeilBrown 17441501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17451501efadSDan Williams return -ENXIO; 17461501efadSDan Williams 17476c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17486c2fce2eSNeil Brown first = last = rdev->raid_disk; 17496c2fce2eSNeil Brown 175070bcecdbSGoldwyn Rodrigues /* 175170bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 175270bcecdbSGoldwyn Rodrigues * if possible. 175370bcecdbSGoldwyn Rodrigues */ 175470bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 175570bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 175670bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 175770bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 175870bcecdbSGoldwyn Rodrigues 17597ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17607ef449d1SNeilBrown p = conf->mirrors+mirror; 17617ef449d1SNeilBrown if (!p->rdev) { 17621da177e4SLinus Torvalds 17639092c02dSJonathan Brassow if (mddev->gendisk) 17648f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17658f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds p->head_position = 0; 17681da177e4SLinus Torvalds rdev->raid_disk = mirror; 1769199050eaSNeil Brown err = 0; 17706aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 17716aea114aSNeilBrown * if this was recently any drive of the array 17726aea114aSNeilBrown */ 17736aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 177441158c7eSNeilBrown conf->fullsync = 1; 1775d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 17761da177e4SLinus Torvalds break; 17771da177e4SLinus Torvalds } 17787ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 17797ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 17807ef449d1SNeilBrown /* Add this device as a replacement */ 17817ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 17827ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 17837ef449d1SNeilBrown rdev->raid_disk = mirror; 17847ef449d1SNeilBrown err = 0; 17857ef449d1SNeilBrown conf->fullsync = 1; 17867ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 17877ef449d1SNeilBrown break; 17887ef449d1SNeilBrown } 17897ef449d1SNeilBrown } 17909092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 17912ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 17921da177e4SLinus Torvalds print_conf(conf); 1793199050eaSNeil Brown return err; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 1796b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 17971da177e4SLinus Torvalds { 1798e8096360SNeilBrown struct r1conf *conf = mddev->private; 17991da177e4SLinus Torvalds int err = 0; 1800b8321b68SNeilBrown int number = rdev->raid_disk; 18010eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 18021da177e4SLinus Torvalds 1803b014f14cSNeilBrown if (rdev != p->rdev) 1804b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1805b014f14cSNeilBrown 18061da177e4SLinus Torvalds print_conf(conf); 1807b8321b68SNeilBrown if (rdev == p->rdev) { 1808b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 18091da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 18101da177e4SLinus Torvalds err = -EBUSY; 18111da177e4SLinus Torvalds goto abort; 18121da177e4SLinus Torvalds } 1813046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1814dfc70645SNeilBrown * is not possible. 1815dfc70645SNeilBrown */ 1816dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18175389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1818dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1819dfc70645SNeilBrown err = -EBUSY; 1820dfc70645SNeilBrown goto abort; 1821dfc70645SNeilBrown } 18221da177e4SLinus Torvalds p->rdev = NULL; 1823d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1824fbd568a3SPaul E. McKenney synchronize_rcu(); 18251da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18261da177e4SLinus Torvalds /* lost the race, try later */ 18271da177e4SLinus Torvalds err = -EBUSY; 18281da177e4SLinus Torvalds p->rdev = rdev; 1829ac5e7113SAndre Noll goto abort; 1830d787be40SNeilBrown } 1831d787be40SNeilBrown } 1832d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18338c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18348c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18358c7a2c2bSNeilBrown * doing this to avoid confusion. 18368c7a2c2bSNeilBrown */ 18378c7a2c2bSNeilBrown struct md_rdev *repl = 18388c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1839e2d59925SNeilBrown freeze_array(conf, 0); 18408c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18418c7a2c2bSNeilBrown p->rdev = repl; 18428c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1843e2d59925SNeilBrown unfreeze_array(conf); 1844b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 18458c7a2c2bSNeilBrown } else 18468c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1847a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18481da177e4SLinus Torvalds } 18491da177e4SLinus Torvalds abort: 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds print_conf(conf); 18521da177e4SLinus Torvalds return err; 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds 18554246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18561da177e4SLinus Torvalds { 18579f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 18581da177e4SLinus Torvalds 18590fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1860ba3ae3beSNamhyung Kim 18611da177e4SLinus Torvalds /* 18621da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 18631da177e4SLinus Torvalds * or re-read if the read failed. 18641da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 18651da177e4SLinus Torvalds */ 18664246a0b6SChristoph Hellwig if (!bio->bi_error) 18671da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1868d11c171eSNeilBrown 1869d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 18701da177e4SLinus Torvalds reschedule_retry(r1_bio); 18711da177e4SLinus Torvalds } 18721da177e4SLinus Torvalds 18734246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 18741da177e4SLinus Torvalds { 18754246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 18769f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1877fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1878e8096360SNeilBrown struct r1conf *conf = mddev->private; 18794367af55SNeilBrown sector_t first_bad; 18804367af55SNeilBrown int bad_sectors; 1881854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1882ba3ae3beSNamhyung Kim 18836b1117d5SNeilBrown if (!uptodate) { 188457dab0bdSNeilBrown sector_t sync_blocks = 0; 18856b1117d5SNeilBrown sector_t s = r1_bio->sector; 18866b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 18876b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 18886b1117d5SNeilBrown do { 18895e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 18906b1117d5SNeilBrown &sync_blocks, 1); 18916b1117d5SNeilBrown s += sync_blocks; 18926b1117d5SNeilBrown sectors_to_go -= sync_blocks; 18936b1117d5SNeilBrown } while (sectors_to_go > 0); 1894854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1895854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 189619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 189719d67169SNeilBrown mddev->recovery); 1898d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1899854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 19003a9f28a5SNeilBrown &first_bad, &bad_sectors) && 19013a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 19023a9f28a5SNeilBrown r1_bio->sector, 19033a9f28a5SNeilBrown r1_bio->sectors, 19043a9f28a5SNeilBrown &first_bad, &bad_sectors) 19053a9f28a5SNeilBrown ) 19064367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1907e3b9703eSNeilBrown 19081da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 19094367af55SNeilBrown int s = r1_bio->sectors; 1910d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1911d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 19124367af55SNeilBrown reschedule_retry(r1_bio); 19134367af55SNeilBrown else { 19141da177e4SLinus Torvalds put_buf(r1_bio); 191573d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 19161da177e4SLinus Torvalds } 19171da177e4SLinus Torvalds } 19184367af55SNeilBrown } 19191da177e4SLinus Torvalds 19203cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1921d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1922d8f05d29SNeilBrown { 1923796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1924d8f05d29SNeilBrown /* success */ 1925d8f05d29SNeilBrown return 1; 192619d67169SNeilBrown if (rw == WRITE) { 1927d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 192819d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 192919d67169SNeilBrown &rdev->flags)) 193019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 193119d67169SNeilBrown rdev->mddev->recovery); 193219d67169SNeilBrown } 1933d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1934d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1935d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1936d8f05d29SNeilBrown return 0; 1937d8f05d29SNeilBrown } 1938d8f05d29SNeilBrown 19399f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19401da177e4SLinus Torvalds { 1941a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 194269382e85SNeilBrown * good data, much like with normal read errors. Only 1943ddac7c7eSNeilBrown * read into the pages we already have so we don't 194469382e85SNeilBrown * need to re-issue the read request. 194569382e85SNeilBrown * We don't need to freeze the array, because being in an 194669382e85SNeilBrown * active sync request, there is no normal IO, and 194769382e85SNeilBrown * no overlapping syncs. 194806f60385SNeilBrown * We don't need to check is_badblock() again as we 194906f60385SNeilBrown * made sure that anything with a bad block in range 195006f60385SNeilBrown * will have bi_end_io clear. 19511da177e4SLinus Torvalds */ 1952fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1953e8096360SNeilBrown struct r1conf *conf = mddev->private; 1954a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 195569382e85SNeilBrown sector_t sect = r1_bio->sector; 195669382e85SNeilBrown int sectors = r1_bio->sectors; 195769382e85SNeilBrown int idx = 0; 19582e52d449SNeilBrown struct md_rdev *rdev; 19592e52d449SNeilBrown 19602e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 19612e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 19622e52d449SNeilBrown /* Don't try recovering from here - just fail it 19632e52d449SNeilBrown * ... unless it is the last working device of course */ 19642e52d449SNeilBrown md_error(mddev, rdev); 19652e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 19662e52d449SNeilBrown /* Don't try to read from here, but make sure 19672e52d449SNeilBrown * put_buf does it's thing 19682e52d449SNeilBrown */ 19692e52d449SNeilBrown bio->bi_end_io = end_sync_write; 19702e52d449SNeilBrown } 197169382e85SNeilBrown 197269382e85SNeilBrown while(sectors) { 197369382e85SNeilBrown int s = sectors; 197469382e85SNeilBrown int d = r1_bio->read_disk; 197569382e85SNeilBrown int success = 0; 197678d7f5f7SNeilBrown int start; 197769382e85SNeilBrown 197869382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 197969382e85SNeilBrown s = PAGE_SIZE >> 9; 198069382e85SNeilBrown do { 198169382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1982ddac7c7eSNeilBrown /* No rcu protection needed here devices 1983ddac7c7eSNeilBrown * can only be removed when no resync is 1984ddac7c7eSNeilBrown * active, and resync is currently active 1985ddac7c7eSNeilBrown */ 198669382e85SNeilBrown rdev = conf->mirrors[d].rdev; 19879d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 198869382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1989796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 199069382e85SNeilBrown success = 1; 199169382e85SNeilBrown break; 199269382e85SNeilBrown } 199369382e85SNeilBrown } 199469382e85SNeilBrown d++; 19958f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 199669382e85SNeilBrown d = 0; 199769382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 199869382e85SNeilBrown 199978d7f5f7SNeilBrown if (!success) { 200078d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 20013a9f28a5SNeilBrown int abort = 0; 20023a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 20033a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 20043a9f28a5SNeilBrown * work just disable and interrupt the recovery. 20053a9f28a5SNeilBrown * Don't fail devices as that won't really help. 20063a9f28a5SNeilBrown */ 20071d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 200878d7f5f7SNeilBrown mdname(mddev), 200978d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 201078d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 20118f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 20123a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 20133a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 20143a9f28a5SNeilBrown continue; 20153a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20163a9f28a5SNeilBrown abort = 1; 20173a9f28a5SNeilBrown } 20183a9f28a5SNeilBrown if (abort) { 2019d890fa2bSNeilBrown conf->recovery_disabled = 2020d890fa2bSNeilBrown mddev->recovery_disabled; 20213a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 202278d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 202378d7f5f7SNeilBrown put_buf(r1_bio); 202478d7f5f7SNeilBrown return 0; 202578d7f5f7SNeilBrown } 20263a9f28a5SNeilBrown /* Try next page */ 20273a9f28a5SNeilBrown sectors -= s; 20283a9f28a5SNeilBrown sect += s; 20293a9f28a5SNeilBrown idx++; 20303a9f28a5SNeilBrown continue; 20313a9f28a5SNeilBrown } 203278d7f5f7SNeilBrown 203378d7f5f7SNeilBrown start = d; 203469382e85SNeilBrown /* write it back and re-read */ 203569382e85SNeilBrown while (d != r1_bio->read_disk) { 203669382e85SNeilBrown if (d == 0) 20378f19ccb2SNeilBrown d = conf->raid_disks * 2; 203869382e85SNeilBrown d--; 203969382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 204069382e85SNeilBrown continue; 204169382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2042d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 204369382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 2044d8f05d29SNeilBrown WRITE) == 0) { 204578d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 204678d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20479d3d8011SNamhyung Kim } 2048097426f6SNeilBrown } 2049097426f6SNeilBrown d = start; 2050097426f6SNeilBrown while (d != r1_bio->read_disk) { 2051097426f6SNeilBrown if (d == 0) 20528f19ccb2SNeilBrown d = conf->raid_disks * 2; 2053097426f6SNeilBrown d--; 2054097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2055097426f6SNeilBrown continue; 2056097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2057d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 205869382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 2059d8f05d29SNeilBrown READ) != 0) 20609d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 206169382e85SNeilBrown } 206269382e85SNeilBrown sectors -= s; 206369382e85SNeilBrown sect += s; 206469382e85SNeilBrown idx ++; 206569382e85SNeilBrown } 206678d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 20674246a0b6SChristoph Hellwig bio->bi_error = 0; 2068a68e5870SNeilBrown return 1; 206969382e85SNeilBrown } 2070d11c171eSNeilBrown 2071c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2072a68e5870SNeilBrown { 2073a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2074a68e5870SNeilBrown * got the block, then there is no hope left. 2075a68e5870SNeilBrown * If we have, then we want to do a comparison 2076a68e5870SNeilBrown * and skip the write if everything is the same. 2077a68e5870SNeilBrown * If any blocks failed to read, then we need to 2078a68e5870SNeilBrown * attempt an over-write 2079a68e5870SNeilBrown */ 2080fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2081e8096360SNeilBrown struct r1conf *conf = mddev->private; 2082a68e5870SNeilBrown int primary; 2083a68e5870SNeilBrown int i; 2084f4380a91Smajianpeng int vcnt; 2085a68e5870SNeilBrown 208630bc9b53SNeilBrown /* Fix variable parts of all bios */ 208730bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 208830bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 208930bc9b53SNeilBrown int j; 209030bc9b53SNeilBrown int size; 20914246a0b6SChristoph Hellwig int error; 209230bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 209330bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 209430bc9b53SNeilBrown continue; 20954246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 20964246a0b6SChristoph Hellwig error = b->bi_error; 209730bc9b53SNeilBrown bio_reset(b); 20984246a0b6SChristoph Hellwig b->bi_error = error; 209930bc9b53SNeilBrown b->bi_vcnt = vcnt; 21004f024f37SKent Overstreet b->bi_iter.bi_size = r1_bio->sectors << 9; 21014f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 210230bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 210330bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 210430bc9b53SNeilBrown b->bi_end_io = end_sync_read; 210530bc9b53SNeilBrown b->bi_private = r1_bio; 210630bc9b53SNeilBrown 21074f024f37SKent Overstreet size = b->bi_iter.bi_size; 210830bc9b53SNeilBrown for (j = 0; j < vcnt ; j++) { 210930bc9b53SNeilBrown struct bio_vec *bi; 211030bc9b53SNeilBrown bi = &b->bi_io_vec[j]; 211130bc9b53SNeilBrown bi->bv_offset = 0; 211230bc9b53SNeilBrown if (size > PAGE_SIZE) 211330bc9b53SNeilBrown bi->bv_len = PAGE_SIZE; 211430bc9b53SNeilBrown else 211530bc9b53SNeilBrown bi->bv_len = size; 211630bc9b53SNeilBrown size -= PAGE_SIZE; 211730bc9b53SNeilBrown } 211830bc9b53SNeilBrown } 21198f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2120a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21214246a0b6SChristoph Hellwig !r1_bio->bios[primary]->bi_error) { 2122a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2123a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2124a68e5870SNeilBrown break; 2125a68e5870SNeilBrown } 2126a68e5870SNeilBrown r1_bio->read_disk = primary; 21278f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2128a68e5870SNeilBrown int j; 2129a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2130a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21314246a0b6SChristoph Hellwig int error = sbio->bi_error; 213278d7f5f7SNeilBrown 21332aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 213478d7f5f7SNeilBrown continue; 21354246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21364246a0b6SChristoph Hellwig sbio->bi_error = 0; 2137a68e5870SNeilBrown 21384246a0b6SChristoph Hellwig if (!error) { 2139a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 2140a68e5870SNeilBrown struct page *p, *s; 2141a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 2142a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 2143a68e5870SNeilBrown if (memcmp(page_address(p), 2144a68e5870SNeilBrown page_address(s), 21455020ad7dSNeilBrown sbio->bi_io_vec[j].bv_len)) 2146a68e5870SNeilBrown break; 2147a68e5870SNeilBrown } 2148a68e5870SNeilBrown } else 2149a68e5870SNeilBrown j = 0; 2150a68e5870SNeilBrown if (j >= 0) 21517f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2152a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21534246a0b6SChristoph Hellwig && !error)) { 215478d7f5f7SNeilBrown /* No need to write to this device. */ 2155a68e5870SNeilBrown sbio->bi_end_io = NULL; 2156a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 215778d7f5f7SNeilBrown continue; 215878d7f5f7SNeilBrown } 2159d3b45c2aSKent Overstreet 2160d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2161a68e5870SNeilBrown } 2162a68e5870SNeilBrown } 2163a68e5870SNeilBrown 21649f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2165a68e5870SNeilBrown { 2166e8096360SNeilBrown struct r1conf *conf = mddev->private; 2167a68e5870SNeilBrown int i; 21688f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2169a68e5870SNeilBrown struct bio *bio, *wbio; 2170a68e5870SNeilBrown 2171a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2172a68e5870SNeilBrown 2173a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2174a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2175a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2176a68e5870SNeilBrown return; 21777ca78d57SNeilBrown 21787ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2179c95e6385SNeilBrown process_checks(r1_bio); 2180c95e6385SNeilBrown 2181d11c171eSNeilBrown /* 2182d11c171eSNeilBrown * schedule writes 2183d11c171eSNeilBrown */ 21841da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 21851da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 21861da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 21873e198f78SNeilBrown if (wbio->bi_end_io == NULL || 21883e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 21893e198f78SNeilBrown (i == r1_bio->read_disk || 21903e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 21911da177e4SLinus Torvalds continue; 21921da177e4SLinus Torvalds 2193796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2194212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2195212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2196212e7eb7SNeilBrown 21973e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 21981da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2199aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2200191ea9b2SNeilBrown 22011da177e4SLinus Torvalds generic_make_request(wbio); 22021da177e4SLinus Torvalds } 22031da177e4SLinus Torvalds 22041da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2205191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 220658e94ae1SNeilBrown int s = r1_bio->sectors; 220758e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 220858e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 220958e94ae1SNeilBrown reschedule_retry(r1_bio); 221058e94ae1SNeilBrown else { 22111da177e4SLinus Torvalds put_buf(r1_bio); 221258e94ae1SNeilBrown md_done_sync(mddev, s, 1); 221358e94ae1SNeilBrown } 22141da177e4SLinus Torvalds } 22151da177e4SLinus Torvalds } 22161da177e4SLinus Torvalds 22171da177e4SLinus Torvalds /* 22181da177e4SLinus Torvalds * This is a kernel thread which: 22191da177e4SLinus Torvalds * 22201da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22211da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2222d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22231da177e4SLinus Torvalds */ 22241da177e4SLinus Torvalds 2225e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2226867868fbSNeilBrown sector_t sect, int sectors) 2227867868fbSNeilBrown { 2228fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2229867868fbSNeilBrown while(sectors) { 2230867868fbSNeilBrown int s = sectors; 2231867868fbSNeilBrown int d = read_disk; 2232867868fbSNeilBrown int success = 0; 2233867868fbSNeilBrown int start; 22343cb03002SNeilBrown struct md_rdev *rdev; 2235867868fbSNeilBrown 2236867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2237867868fbSNeilBrown s = PAGE_SIZE >> 9; 2238867868fbSNeilBrown 2239867868fbSNeilBrown do { 2240d2eb35acSNeilBrown sector_t first_bad; 2241d2eb35acSNeilBrown int bad_sectors; 2242d2eb35acSNeilBrown 2243707a6a42SNeilBrown rcu_read_lock(); 2244707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2245867868fbSNeilBrown if (rdev && 2246da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2247da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2248da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2249d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2250707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2251707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2252707a6a42SNeilBrown rcu_read_unlock(); 2253707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2254796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2255867868fbSNeilBrown success = 1; 2256707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2257707a6a42SNeilBrown if (success) 2258707a6a42SNeilBrown break; 2259707a6a42SNeilBrown } else 2260707a6a42SNeilBrown rcu_read_unlock(); 2261867868fbSNeilBrown d++; 22628f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2263867868fbSNeilBrown d = 0; 2264867868fbSNeilBrown } while (!success && d != read_disk); 2265867868fbSNeilBrown 2266867868fbSNeilBrown if (!success) { 2267d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 22683cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2269d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2270d8f05d29SNeilBrown md_error(mddev, rdev); 2271867868fbSNeilBrown break; 2272867868fbSNeilBrown } 2273867868fbSNeilBrown /* write it back and re-read */ 2274867868fbSNeilBrown start = d; 2275867868fbSNeilBrown while (d != read_disk) { 2276867868fbSNeilBrown if (d==0) 22778f19ccb2SNeilBrown d = conf->raid_disks * 2; 2278867868fbSNeilBrown d--; 2279707a6a42SNeilBrown rcu_read_lock(); 2280707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2281867868fbSNeilBrown if (rdev && 2282707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2283707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2284707a6a42SNeilBrown rcu_read_unlock(); 2285d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2286d8f05d29SNeilBrown conf->tmppage, WRITE); 2287707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2288707a6a42SNeilBrown } else 2289707a6a42SNeilBrown rcu_read_unlock(); 2290867868fbSNeilBrown } 2291867868fbSNeilBrown d = start; 2292867868fbSNeilBrown while (d != read_disk) { 2293867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2294867868fbSNeilBrown if (d==0) 22958f19ccb2SNeilBrown d = conf->raid_disks * 2; 2296867868fbSNeilBrown d--; 2297707a6a42SNeilBrown rcu_read_lock(); 2298707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2299867868fbSNeilBrown if (rdev && 2300b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2301707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2302707a6a42SNeilBrown rcu_read_unlock(); 2303d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2304d8f05d29SNeilBrown conf->tmppage, READ)) { 2305867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 23061d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2307867868fbSNeilBrown mdname(mddev), s, 2308969b755aSRandy Dunlap (unsigned long long)(sect + 2309969b755aSRandy Dunlap rdev->data_offset), 2310867868fbSNeilBrown bdevname(rdev->bdev, b)); 2311867868fbSNeilBrown } 2312707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2313707a6a42SNeilBrown } else 2314707a6a42SNeilBrown rcu_read_unlock(); 2315867868fbSNeilBrown } 2316867868fbSNeilBrown sectors -= s; 2317867868fbSNeilBrown sect += s; 2318867868fbSNeilBrown } 2319867868fbSNeilBrown } 2320867868fbSNeilBrown 23219f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2322cd5ff9a1SNeilBrown { 2323fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2324e8096360SNeilBrown struct r1conf *conf = mddev->private; 23253cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2326cd5ff9a1SNeilBrown 2327cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2328cd5ff9a1SNeilBrown * we just recently had a write error. 2329cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2330cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2331cd5ff9a1SNeilBrown * a bad block. 2332cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2333cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2334cd5ff9a1SNeilBrown * 2335cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2336cd5ff9a1SNeilBrown */ 2337cd5ff9a1SNeilBrown 2338cd5ff9a1SNeilBrown int block_sectors; 2339cd5ff9a1SNeilBrown sector_t sector; 2340cd5ff9a1SNeilBrown int sectors; 2341cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2342cd5ff9a1SNeilBrown int ok = 1; 2343cd5ff9a1SNeilBrown 2344cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2345cd5ff9a1SNeilBrown return 0; 2346cd5ff9a1SNeilBrown 2347ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2348ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2349cd5ff9a1SNeilBrown sector = r1_bio->sector; 2350cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2351cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2352cd5ff9a1SNeilBrown - sector; 2353cd5ff9a1SNeilBrown 2354cd5ff9a1SNeilBrown while (sect_to_write) { 2355cd5ff9a1SNeilBrown struct bio *wbio; 2356cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2357cd5ff9a1SNeilBrown sectors = sect_to_write; 2358cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2359cd5ff9a1SNeilBrown 2360b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2361b783863fSKent Overstreet unsigned vcnt = r1_bio->behind_page_count; 2362b783863fSKent Overstreet struct bio_vec *vec = r1_bio->behind_bvecs; 2363b783863fSKent Overstreet 2364b783863fSKent Overstreet while (!vec->bv_page) { 2365b783863fSKent Overstreet vec++; 2366b783863fSKent Overstreet vcnt--; 2367b783863fSKent Overstreet } 2368b783863fSKent Overstreet 2369cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 2370cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 2371b783863fSKent Overstreet 2372cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 2373b783863fSKent Overstreet } else { 2374d7a10308SMing Lei wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2375d7a10308SMing Lei mddev->bio_set); 2376b783863fSKent Overstreet } 2377b783863fSKent Overstreet 2378796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 23794f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 23804f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2381cd5ff9a1SNeilBrown 23826678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 23834f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2384cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 23854e49ea4aSMike Christie 23864e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2387cd5ff9a1SNeilBrown /* failure! */ 2388cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2389cd5ff9a1SNeilBrown sectors, 0) 2390cd5ff9a1SNeilBrown && ok; 2391cd5ff9a1SNeilBrown 2392cd5ff9a1SNeilBrown bio_put(wbio); 2393cd5ff9a1SNeilBrown sect_to_write -= sectors; 2394cd5ff9a1SNeilBrown sector += sectors; 2395cd5ff9a1SNeilBrown sectors = block_sectors; 2396cd5ff9a1SNeilBrown } 2397cd5ff9a1SNeilBrown return ok; 2398cd5ff9a1SNeilBrown } 2399cd5ff9a1SNeilBrown 2400e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 240162096bceSNeilBrown { 240262096bceSNeilBrown int m; 240362096bceSNeilBrown int s = r1_bio->sectors; 24048f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 24053cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 240662096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 240762096bceSNeilBrown if (bio->bi_end_io == NULL) 240862096bceSNeilBrown continue; 24094246a0b6SChristoph Hellwig if (!bio->bi_error && 241062096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2411c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 241262096bceSNeilBrown } 24134246a0b6SChristoph Hellwig if (bio->bi_error && 241462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 241562096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 241662096bceSNeilBrown md_error(conf->mddev, rdev); 241762096bceSNeilBrown } 241862096bceSNeilBrown } 241962096bceSNeilBrown put_buf(r1_bio); 242062096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 242162096bceSNeilBrown } 242262096bceSNeilBrown 2423e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 242462096bceSNeilBrown { 2425fd76863eScolyli@suse.de int m, idx; 242655ce74d4SNeilBrown bool fail = false; 2427fd76863eScolyli@suse.de 24288f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 242962096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24303cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 243162096bceSNeilBrown rdev_clear_badblocks(rdev, 243262096bceSNeilBrown r1_bio->sector, 2433c6563a8cSNeilBrown r1_bio->sectors, 0); 243462096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 243562096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 243662096bceSNeilBrown /* This drive got a write error. We need to 243762096bceSNeilBrown * narrow down and record precise write 243862096bceSNeilBrown * errors. 243962096bceSNeilBrown */ 244055ce74d4SNeilBrown fail = true; 244162096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 244262096bceSNeilBrown md_error(conf->mddev, 244362096bceSNeilBrown conf->mirrors[m].rdev); 244462096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 244562096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 244662096bceSNeilBrown } 244762096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 244862096bceSNeilBrown conf->mddev); 244962096bceSNeilBrown } 245055ce74d4SNeilBrown if (fail) { 245155ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 245255ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2453fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2454824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 245555ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2456824e47daScolyli@suse.de /* 2457824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2458824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2459824e47daScolyli@suse.de */ 2460824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 246155ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2462bd8688a1SNeilBrown } else { 2463bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2464bd8688a1SNeilBrown close_write(r1_bio); 246562096bceSNeilBrown raid_end_bio_io(r1_bio); 246662096bceSNeilBrown } 2467bd8688a1SNeilBrown } 246862096bceSNeilBrown 2469e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 247062096bceSNeilBrown { 247162096bceSNeilBrown int disk; 247262096bceSNeilBrown int max_sectors; 2473fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 247462096bceSNeilBrown struct bio *bio; 247562096bceSNeilBrown char b[BDEVNAME_SIZE]; 24763cb03002SNeilBrown struct md_rdev *rdev; 2477109e3765SNeilBrown dev_t bio_dev; 2478109e3765SNeilBrown sector_t bio_sector; 247962096bceSNeilBrown 248062096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 248162096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 248262096bceSNeilBrown * the block and we can fix it. 248362096bceSNeilBrown * We freeze all other IO, and try reading the block from 248462096bceSNeilBrown * other devices. When we find one, we re-write 248562096bceSNeilBrown * and check it that fixes the read error. 248662096bceSNeilBrown * This is all done synchronously while the array is 248762096bceSNeilBrown * frozen 248862096bceSNeilBrown */ 24897449f699STomasz Majchrzak 24907449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 24917449f699STomasz Majchrzak bdevname(bio->bi_bdev, b); 2492109e3765SNeilBrown bio_dev = bio->bi_bdev->bd_dev; 2493109e3765SNeilBrown bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; 24947449f699STomasz Majchrzak bio_put(bio); 24957449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 24967449f699STomasz Majchrzak 24972e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 24982e52d449SNeilBrown if (mddev->ro == 0 24992e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2500e2d59925SNeilBrown freeze_array(conf, 1); 250162096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 250262096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 250362096bceSNeilBrown unfreeze_array(conf); 25047449f699STomasz Majchrzak } else { 25057449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 25067449f699STomasz Majchrzak } 25077449f699STomasz Majchrzak 25082e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 250962096bceSNeilBrown 251062096bceSNeilBrown read_more: 251162096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 251262096bceSNeilBrown if (disk == -1) { 25131d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 251462096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 251562096bceSNeilBrown raid_end_bio_io(r1_bio); 251662096bceSNeilBrown } else { 251762096bceSNeilBrown const unsigned long do_sync 25181eff9d32SJens Axboe = r1_bio->master_bio->bi_opf & REQ_SYNC; 251962096bceSNeilBrown r1_bio->read_disk = disk; 2520d7a10308SMing Lei bio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2521d7a10308SMing Lei mddev->bio_set); 25224f024f37SKent Overstreet bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, 25234f024f37SKent Overstreet max_sectors); 252462096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 252562096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 25261d41c216SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 252762096bceSNeilBrown mdname(mddev), 252862096bceSNeilBrown (unsigned long long)r1_bio->sector, 252962096bceSNeilBrown bdevname(rdev->bdev, b)); 25304f024f37SKent Overstreet bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; 253162096bceSNeilBrown bio->bi_bdev = rdev->bdev; 253262096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 2533796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, do_sync); 25342e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags) && 25352e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 25362e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 253762096bceSNeilBrown bio->bi_private = r1_bio; 253862096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 253962096bceSNeilBrown /* Drat - have to split this up more */ 254062096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 254162096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 25424f024f37SKent Overstreet - mbio->bi_iter.bi_sector); 254362096bceSNeilBrown r1_bio->sectors = max_sectors; 254462096bceSNeilBrown spin_lock_irq(&conf->device_lock); 254562096bceSNeilBrown if (mbio->bi_phys_segments == 0) 254662096bceSNeilBrown mbio->bi_phys_segments = 2; 254762096bceSNeilBrown else 254862096bceSNeilBrown mbio->bi_phys_segments++; 254962096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 2550109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2551109e3765SNeilBrown bio, bio_dev, bio_sector); 255262096bceSNeilBrown generic_make_request(bio); 255362096bceSNeilBrown bio = NULL; 255462096bceSNeilBrown 2555fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, mbio, sectors_handled); 255662096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 255762096bceSNeilBrown 255862096bceSNeilBrown goto read_more; 2559109e3765SNeilBrown } else { 2560109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2561109e3765SNeilBrown bio, bio_dev, bio_sector); 256262096bceSNeilBrown generic_make_request(bio); 256362096bceSNeilBrown } 256462096bceSNeilBrown } 2565109e3765SNeilBrown } 256662096bceSNeilBrown 25674ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25681da177e4SLinus Torvalds { 25694ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25709f2c9d12SNeilBrown struct r1bio *r1_bio; 25711da177e4SLinus Torvalds unsigned long flags; 2572e8096360SNeilBrown struct r1conf *conf = mddev->private; 25731da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2574e1dfa0a2SNeilBrown struct blk_plug plug; 2575fd76863eScolyli@suse.de int idx; 25761da177e4SLinus Torvalds 25771da177e4SLinus Torvalds md_check_recovery(mddev); 25781da177e4SLinus Torvalds 257955ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25802953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 258155ce74d4SNeilBrown LIST_HEAD(tmp); 258255ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2583fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2584fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 258555ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 258655ce74d4SNeilBrown while (!list_empty(&tmp)) { 2587a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2588a452744bSMikulas Patocka retry_list); 258955ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2590fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2591824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2592bd8688a1SNeilBrown if (mddev->degraded) 2593bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2594bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2595bd8688a1SNeilBrown close_write(r1_bio); 259655ce74d4SNeilBrown raid_end_bio_io(r1_bio); 259755ce74d4SNeilBrown } 259855ce74d4SNeilBrown } 259955ce74d4SNeilBrown 2600e1dfa0a2SNeilBrown blk_start_plug(&plug); 26011da177e4SLinus Torvalds for (;;) { 2602a35e63efSNeilBrown 26037eaceaccSJens Axboe flush_pending_writes(conf); 2604a35e63efSNeilBrown 26051da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2606a35e63efSNeilBrown if (list_empty(head)) { 2607191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 26081da177e4SLinus Torvalds break; 2609a35e63efSNeilBrown } 26109f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 26111da177e4SLinus Torvalds list_del(head->prev); 2612fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2613824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 26141da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 26151da177e4SLinus Torvalds 26161da177e4SLinus Torvalds mddev = r1_bio->mddev; 2617070ec55dSNeilBrown conf = mddev->private; 26184367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2619d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 262062096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 262162096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 262262096bceSNeilBrown else 26231da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2624cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 262562096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 262662096bceSNeilBrown handle_write_finished(conf, r1_bio); 262762096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 262862096bceSNeilBrown handle_read_error(conf, r1_bio); 2629d2eb35acSNeilBrown else 2630d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2631d2eb35acSNeilBrown * context 2632d2eb35acSNeilBrown */ 2633d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 263462096bceSNeilBrown 26351d9d5241SNeilBrown cond_resched(); 26362953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2637de393cdeSNeilBrown md_check_recovery(mddev); 26381da177e4SLinus Torvalds } 2639e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26401da177e4SLinus Torvalds } 26411da177e4SLinus Torvalds 2642e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26431da177e4SLinus Torvalds { 26441da177e4SLinus Torvalds int buffs; 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 26479e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 26481da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 26491da177e4SLinus Torvalds conf->poolinfo); 26501da177e4SLinus Torvalds if (!conf->r1buf_pool) 26511da177e4SLinus Torvalds return -ENOMEM; 26521da177e4SLinus Torvalds return 0; 26531da177e4SLinus Torvalds } 26541da177e4SLinus Torvalds 26551da177e4SLinus Torvalds /* 26561da177e4SLinus Torvalds * perform a "sync" on one "block" 26571da177e4SLinus Torvalds * 26581da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26591da177e4SLinus Torvalds * requests - conflict with active sync requests. 26601da177e4SLinus Torvalds * 26611da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26621da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26631da177e4SLinus Torvalds */ 26641da177e4SLinus Torvalds 2665849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2666849674e4SShaohua Li int *skipped) 26671da177e4SLinus Torvalds { 2668e8096360SNeilBrown struct r1conf *conf = mddev->private; 26699f2c9d12SNeilBrown struct r1bio *r1_bio; 26701da177e4SLinus Torvalds struct bio *bio; 26711da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26723e198f78SNeilBrown int disk = -1; 26731da177e4SLinus Torvalds int i; 26743e198f78SNeilBrown int wonly = -1; 26753e198f78SNeilBrown int write_targets = 0, read_targets = 0; 267657dab0bdSNeilBrown sector_t sync_blocks; 2677e3b9703eSNeilBrown int still_degraded = 0; 267806f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 267906f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2680fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 26811da177e4SLinus Torvalds 26821da177e4SLinus Torvalds if (!conf->r1buf_pool) 26831da177e4SLinus Torvalds if (init_resync(conf)) 268457afd89fSNeilBrown return 0; 26851da177e4SLinus Torvalds 268658c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26871da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2688191ea9b2SNeilBrown /* If we aborted, we need to abort the 2689191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2690191ea9b2SNeilBrown * only be one in raid1 resync. 2691191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2692191ea9b2SNeilBrown */ 26936a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 26946a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2695191ea9b2SNeilBrown &sync_blocks, 1); 26966a806c51SNeilBrown else /* completed sync */ 2697191ea9b2SNeilBrown conf->fullsync = 0; 26986a806c51SNeilBrown 26996a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 27001da177e4SLinus Torvalds close_sync(conf); 2701c40f341fSGoldwyn Rodrigues 2702c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2703c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2704c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2705c40f341fSGoldwyn Rodrigues } 27061da177e4SLinus Torvalds return 0; 27071da177e4SLinus Torvalds } 27081da177e4SLinus Torvalds 270907d84d10SNeilBrown if (mddev->bitmap == NULL && 271007d84d10SNeilBrown mddev->recovery_cp == MaxSector && 27116394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 271207d84d10SNeilBrown conf->fullsync == 0) { 271307d84d10SNeilBrown *skipped = 1; 271407d84d10SNeilBrown return max_sector - sector_nr; 271507d84d10SNeilBrown } 27166394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 27176394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 27186394cca5SNeilBrown */ 2719e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2720e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2721191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2722191ea9b2SNeilBrown *skipped = 1; 2723191ea9b2SNeilBrown return sync_blocks; 2724191ea9b2SNeilBrown } 272517999be4SNeilBrown 27267ac50447STomasz Majchrzak /* 27277ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 27287ac50447STomasz Majchrzak * though before starting on this new sync request. 27297ac50447STomasz Majchrzak */ 2730824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27317ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27327ac50447STomasz Majchrzak 2733c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2734c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2735c40f341fSGoldwyn Rodrigues */ 2736c40f341fSGoldwyn Rodrigues 2737c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2738c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 27391c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 274017999be4SNeilBrown 2741c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 27421da177e4SLinus Torvalds 27433e198f78SNeilBrown rcu_read_lock(); 27443e198f78SNeilBrown /* 27453e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27463e198f78SNeilBrown * we might want to read from a different device. So we 27473e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27483e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27493e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27503e198f78SNeilBrown * is OK. 27513e198f78SNeilBrown */ 27521da177e4SLinus Torvalds 27531da177e4SLinus Torvalds r1_bio->mddev = mddev; 27541da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2755191ea9b2SNeilBrown r1_bio->state = 0; 27561da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2757fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2758fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27591da177e4SLinus Torvalds 27608f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27613cb03002SNeilBrown struct md_rdev *rdev; 27621da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27632aabaa65SKent Overstreet bio_reset(bio); 27641da177e4SLinus Torvalds 27653e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27663e198f78SNeilBrown if (rdev == NULL || 27673e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27688f19ccb2SNeilBrown if (i < conf->raid_disks) 2769e3b9703eSNeilBrown still_degraded = 1; 27703e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2771796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 27721da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27731da177e4SLinus Torvalds write_targets ++; 27743e198f78SNeilBrown } else { 27753e198f78SNeilBrown /* may need to read from here */ 277606f60385SNeilBrown sector_t first_bad = MaxSector; 277706f60385SNeilBrown int bad_sectors; 277806f60385SNeilBrown 277906f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 278006f60385SNeilBrown &first_bad, &bad_sectors)) { 278106f60385SNeilBrown if (first_bad > sector_nr) 278206f60385SNeilBrown good_sectors = first_bad - sector_nr; 278306f60385SNeilBrown else { 278406f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 278506f60385SNeilBrown if (min_bad == 0 || 278606f60385SNeilBrown min_bad > bad_sectors) 278706f60385SNeilBrown min_bad = bad_sectors; 278806f60385SNeilBrown } 278906f60385SNeilBrown } 279006f60385SNeilBrown if (sector_nr < first_bad) { 27913e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27923e198f78SNeilBrown if (wonly < 0) 27933e198f78SNeilBrown wonly = i; 27943e198f78SNeilBrown } else { 27953e198f78SNeilBrown if (disk < 0) 27963e198f78SNeilBrown disk = i; 27973e198f78SNeilBrown } 2798796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 279906f60385SNeilBrown bio->bi_end_io = end_sync_read; 28003e198f78SNeilBrown read_targets++; 2801d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2802d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2803d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2804d57368afSAlexander Lyakas /* 2805d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2806d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2807d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2808d57368afSAlexander Lyakas * this device alone for this sync request. 2809d57368afSAlexander Lyakas */ 2810796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2811d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2812d57368afSAlexander Lyakas write_targets++; 28133e198f78SNeilBrown } 281406f60385SNeilBrown } 281506f60385SNeilBrown if (bio->bi_end_io) { 28163e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 28174f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 28183e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 28191da177e4SLinus Torvalds bio->bi_private = r1_bio; 28202e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 28212e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 28221da177e4SLinus Torvalds } 282306f60385SNeilBrown } 28243e198f78SNeilBrown rcu_read_unlock(); 28253e198f78SNeilBrown if (disk < 0) 28263e198f78SNeilBrown disk = wonly; 28273e198f78SNeilBrown r1_bio->read_disk = disk; 2828191ea9b2SNeilBrown 282906f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 283006f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 283106f60385SNeilBrown * need to mark them bad on all write targets 283206f60385SNeilBrown */ 283306f60385SNeilBrown int ok = 1; 28348f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 283506f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2836a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 283706f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 283806f60385SNeilBrown min_bad, 0 283906f60385SNeilBrown ) && ok; 284006f60385SNeilBrown } 28412953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 284206f60385SNeilBrown *skipped = 1; 284306f60385SNeilBrown put_buf(r1_bio); 284406f60385SNeilBrown 284506f60385SNeilBrown if (!ok) { 284606f60385SNeilBrown /* Cannot record the badblocks, so need to 284706f60385SNeilBrown * abort the resync. 284806f60385SNeilBrown * If there are multiple read targets, could just 284906f60385SNeilBrown * fail the really bad ones ??? 285006f60385SNeilBrown */ 285106f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 285206f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 285306f60385SNeilBrown return 0; 285406f60385SNeilBrown } else 285506f60385SNeilBrown return min_bad; 285606f60385SNeilBrown 285706f60385SNeilBrown } 285806f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 285906f60385SNeilBrown /* only resync enough to reach the next bad->good 286006f60385SNeilBrown * transition */ 286106f60385SNeilBrown good_sectors = min_bad; 286206f60385SNeilBrown } 286306f60385SNeilBrown 28643e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28653e198f78SNeilBrown /* extra read targets are also write targets */ 28663e198f78SNeilBrown write_targets += read_targets-1; 28673e198f78SNeilBrown 28683e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28691da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28701da177e4SLinus Torvalds * drives must be failed - so we are finished 28711da177e4SLinus Torvalds */ 2872b7219ccbSNeilBrown sector_t rv; 2873b7219ccbSNeilBrown if (min_bad > 0) 2874b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2875b7219ccbSNeilBrown rv = max_sector - sector_nr; 287657afd89fSNeilBrown *skipped = 1; 28771da177e4SLinus Torvalds put_buf(r1_bio); 28781da177e4SLinus Torvalds return rv; 28791da177e4SLinus Torvalds } 28801da177e4SLinus Torvalds 2881c6207277SNeilBrown if (max_sector > mddev->resync_max) 2882c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 288306f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 288406f60385SNeilBrown max_sector = sector_nr + good_sectors; 28851da177e4SLinus Torvalds nr_sectors = 0; 2886289e99e8SNeilBrown sync_blocks = 0; 28871da177e4SLinus Torvalds do { 28881da177e4SLinus Torvalds struct page *page; 28891da177e4SLinus Torvalds int len = PAGE_SIZE; 28901da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28911da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28921da177e4SLinus Torvalds if (len == 0) 28931da177e4SLinus Torvalds break; 2894ab7a30c7SNeilBrown if (sync_blocks == 0) { 28956a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2896e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2897e5de485fSNeilBrown !conf->fullsync && 2898e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2899191ea9b2SNeilBrown break; 29007571ae88SNeilBrown if ((len >> 9) > sync_blocks) 29016a806c51SNeilBrown len = sync_blocks<<9; 2902ab7a30c7SNeilBrown } 2903191ea9b2SNeilBrown 29048f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 29051da177e4SLinus Torvalds bio = r1_bio->bios[i]; 29061da177e4SLinus Torvalds if (bio->bi_end_io) { 2907d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 29081da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 29091da177e4SLinus Torvalds /* stop here */ 2910d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 29111da177e4SLinus Torvalds while (i > 0) { 29121da177e4SLinus Torvalds i--; 29131da177e4SLinus Torvalds bio = r1_bio->bios[i]; 29146a806c51SNeilBrown if (bio->bi_end_io==NULL) 29156a806c51SNeilBrown continue; 29161da177e4SLinus Torvalds /* remove last page from this bio */ 29171da177e4SLinus Torvalds bio->bi_vcnt--; 29184f024f37SKent Overstreet bio->bi_iter.bi_size -= len; 2919b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 29201da177e4SLinus Torvalds } 29211da177e4SLinus Torvalds goto bio_full; 29221da177e4SLinus Torvalds } 29231da177e4SLinus Torvalds } 29241da177e4SLinus Torvalds } 29251da177e4SLinus Torvalds nr_sectors += len>>9; 29261da177e4SLinus Torvalds sector_nr += len>>9; 2927191ea9b2SNeilBrown sync_blocks -= (len>>9); 29281da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 29291da177e4SLinus Torvalds bio_full: 29301da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 29311da177e4SLinus Torvalds 2932c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2933c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2934c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2935c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2936c40f341fSGoldwyn Rodrigues /* Send resync message */ 2937c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2938c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2939c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2940c40f341fSGoldwyn Rodrigues } 2941c40f341fSGoldwyn Rodrigues 2942d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2943d11c171eSNeilBrown * compare 2944d11c171eSNeilBrown */ 2945d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2946d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29472d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2948d11c171eSNeilBrown bio = r1_bio->bios[i]; 2949d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29502d4f4f33SNeilBrown read_targets--; 2951ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 29522e52d449SNeilBrown if (read_targets == 1) 29532e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 29541da177e4SLinus Torvalds generic_make_request(bio); 2955d11c171eSNeilBrown } 2956d11c171eSNeilBrown } 2957d11c171eSNeilBrown } else { 2958d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2959d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2960ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 29612e52d449SNeilBrown if (read_targets == 1) 29622e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2963d11c171eSNeilBrown generic_make_request(bio); 2964d11c171eSNeilBrown 2965d11c171eSNeilBrown } 29661da177e4SLinus Torvalds return nr_sectors; 29671da177e4SLinus Torvalds } 29681da177e4SLinus Torvalds 2969fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 297080c3a6ceSDan Williams { 297180c3a6ceSDan Williams if (sectors) 297280c3a6ceSDan Williams return sectors; 297380c3a6ceSDan Williams 297480c3a6ceSDan Williams return mddev->dev_sectors; 297580c3a6ceSDan Williams } 297680c3a6ceSDan Williams 2977e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29781da177e4SLinus Torvalds { 2979e8096360SNeilBrown struct r1conf *conf; 2980709ae487SNeilBrown int i; 29810eaf822cSJonathan Brassow struct raid1_info *disk; 29823cb03002SNeilBrown struct md_rdev *rdev; 2983709ae487SNeilBrown int err = -ENOMEM; 29841da177e4SLinus Torvalds 2985e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29861da177e4SLinus Torvalds if (!conf) 2987709ae487SNeilBrown goto abort; 29881da177e4SLinus Torvalds 2989fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2990824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2991fd76863eScolyli@suse.de if (!conf->nr_pending) 2992fd76863eScolyli@suse.de goto abort; 2993fd76863eScolyli@suse.de 2994fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2995824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2996fd76863eScolyli@suse.de if (!conf->nr_waiting) 2997fd76863eScolyli@suse.de goto abort; 2998fd76863eScolyli@suse.de 2999fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 3000824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 3001fd76863eScolyli@suse.de if (!conf->nr_queued) 3002fd76863eScolyli@suse.de goto abort; 3003fd76863eScolyli@suse.de 3004fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 3005824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 3006fd76863eScolyli@suse.de if (!conf->barrier) 3007fd76863eScolyli@suse.de goto abort; 3008fd76863eScolyli@suse.de 30090eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 30108f19ccb2SNeilBrown * mddev->raid_disks * 2, 30111da177e4SLinus Torvalds GFP_KERNEL); 30121da177e4SLinus Torvalds if (!conf->mirrors) 3013709ae487SNeilBrown goto abort; 30141da177e4SLinus Torvalds 3015ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 3016ddaf22abSNeilBrown if (!conf->tmppage) 3017709ae487SNeilBrown goto abort; 3018ddaf22abSNeilBrown 3019709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 30201da177e4SLinus Torvalds if (!conf->poolinfo) 3021709ae487SNeilBrown goto abort; 30228f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 30231da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 30241da177e4SLinus Torvalds r1bio_pool_free, 30251da177e4SLinus Torvalds conf->poolinfo); 30261da177e4SLinus Torvalds if (!conf->r1bio_pool) 3027709ae487SNeilBrown goto abort; 3028709ae487SNeilBrown 3029ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 30301da177e4SLinus Torvalds 3031c19d5798SNeilBrown err = -EINVAL; 3032e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3033dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3034aba336bdSNeilBrown struct request_queue *q; 3035709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30361da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30371da177e4SLinus Torvalds || disk_idx < 0) 30381da177e4SLinus Torvalds continue; 3039c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 304002b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3041c19d5798SNeilBrown else 30421da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30431da177e4SLinus Torvalds 3044c19d5798SNeilBrown if (disk->rdev) 3045c19d5798SNeilBrown goto abort; 30461da177e4SLinus Torvalds disk->rdev = rdev; 3047aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 30481da177e4SLinus Torvalds 30491da177e4SLinus Torvalds disk->head_position = 0; 305012cee5a8SShaohua Li disk->seq_start = MaxSector; 30511da177e4SLinus Torvalds } 30521da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30531da177e4SLinus Torvalds conf->mddev = mddev; 30541da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 305555ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30561da177e4SLinus Torvalds 30571da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 305817999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30591da177e4SLinus Torvalds 3060191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 306134db0cd6SNeilBrown conf->pending_count = 0; 3062d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3063191ea9b2SNeilBrown 3064c19d5798SNeilBrown err = -EIO; 30658f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30661da177e4SLinus Torvalds 30671da177e4SLinus Torvalds disk = conf->mirrors + i; 30681da177e4SLinus Torvalds 3069c19d5798SNeilBrown if (i < conf->raid_disks && 3070c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3071c19d5798SNeilBrown /* This slot has a replacement. */ 3072c19d5798SNeilBrown if (!disk->rdev) { 3073c19d5798SNeilBrown /* No original, just make the replacement 3074c19d5798SNeilBrown * a recovering spare 3075c19d5798SNeilBrown */ 3076c19d5798SNeilBrown disk->rdev = 3077c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3078c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3079c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3080c19d5798SNeilBrown /* Original is not in_sync - bad */ 3081c19d5798SNeilBrown goto abort; 3082c19d5798SNeilBrown } 3083c19d5798SNeilBrown 30845fd6c1dcSNeilBrown if (!disk->rdev || 30855fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30861da177e4SLinus Torvalds disk->head_position = 0; 30874f0a5e01SJonathan Brassow if (disk->rdev && 30884f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 308917571284SNeilBrown conf->fullsync = 1; 3090be4d3280SShaohua Li } 30911da177e4SLinus Torvalds } 3092709ae487SNeilBrown 3093709ae487SNeilBrown err = -ENOMEM; 30940232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30951d41c216SNeilBrown if (!conf->thread) 3096709ae487SNeilBrown goto abort; 3097191ea9b2SNeilBrown 3098709ae487SNeilBrown return conf; 3099709ae487SNeilBrown 3100709ae487SNeilBrown abort: 3101709ae487SNeilBrown if (conf) { 3102709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 3103709ae487SNeilBrown kfree(conf->mirrors); 3104709ae487SNeilBrown safe_put_page(conf->tmppage); 3105709ae487SNeilBrown kfree(conf->poolinfo); 3106fd76863eScolyli@suse.de kfree(conf->nr_pending); 3107fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3108fd76863eScolyli@suse.de kfree(conf->nr_queued); 3109fd76863eScolyli@suse.de kfree(conf->barrier); 3110709ae487SNeilBrown kfree(conf); 3111709ae487SNeilBrown } 3112709ae487SNeilBrown return ERR_PTR(err); 3113709ae487SNeilBrown } 3114709ae487SNeilBrown 3115afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3116849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3117709ae487SNeilBrown { 3118e8096360SNeilBrown struct r1conf *conf; 3119709ae487SNeilBrown int i; 31203cb03002SNeilBrown struct md_rdev *rdev; 31215220ea1eSmajianpeng int ret; 31222ff8cc2cSShaohua Li bool discard_supported = false; 3123709ae487SNeilBrown 3124709ae487SNeilBrown if (mddev->level != 1) { 31251d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3126709ae487SNeilBrown mdname(mddev), mddev->level); 3127709ae487SNeilBrown return -EIO; 3128709ae487SNeilBrown } 3129709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 31301d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3131709ae487SNeilBrown mdname(mddev)); 3132709ae487SNeilBrown return -EIO; 3133709ae487SNeilBrown } 3134709ae487SNeilBrown /* 3135709ae487SNeilBrown * copy the already verified devices into our private RAID1 3136709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3137afa0f557SNeilBrown * should be freed in raid1_free()] 3138709ae487SNeilBrown */ 3139709ae487SNeilBrown if (mddev->private == NULL) 3140709ae487SNeilBrown conf = setup_conf(mddev); 3141709ae487SNeilBrown else 3142709ae487SNeilBrown conf = mddev->private; 3143709ae487SNeilBrown 3144709ae487SNeilBrown if (IS_ERR(conf)) 3145709ae487SNeilBrown return PTR_ERR(conf); 3146709ae487SNeilBrown 3147c8dc9c65SJoe Lawrence if (mddev->queue) 31485026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 31495026d7a9SH. Peter Anvin 3150dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31511ed7242eSJonathan Brassow if (!mddev->gendisk) 31521ed7242eSJonathan Brassow continue; 3153709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3154709ae487SNeilBrown rdev->data_offset << 9); 31552ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 31562ff8cc2cSShaohua Li discard_supported = true; 3157709ae487SNeilBrown } 3158709ae487SNeilBrown 3159709ae487SNeilBrown mddev->degraded = 0; 3160709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 3161709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3162709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3163709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3164709ae487SNeilBrown mddev->degraded++; 3165709ae487SNeilBrown 3166709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3167709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3168709ae487SNeilBrown 31698c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31701d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31718c6ac868SAndre Noll mdname(mddev)); 31721d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31731da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31741da177e4SLinus Torvalds mddev->raid_disks); 3175709ae487SNeilBrown 31761da177e4SLinus Torvalds /* 31771da177e4SLinus Torvalds * Ok, everything is just fine now 31781da177e4SLinus Torvalds */ 3179709ae487SNeilBrown mddev->thread = conf->thread; 3180709ae487SNeilBrown conf->thread = NULL; 3181709ae487SNeilBrown mddev->private = conf; 318246533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3183709ae487SNeilBrown 31841f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31851da177e4SLinus Torvalds 31861ed7242eSJonathan Brassow if (mddev->queue) { 31872ff8cc2cSShaohua Li if (discard_supported) 31882ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 31892ff8cc2cSShaohua Li mddev->queue); 31902ff8cc2cSShaohua Li else 31912ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 31922ff8cc2cSShaohua Li mddev->queue); 31931ed7242eSJonathan Brassow } 31945220ea1eSmajianpeng 31955220ea1eSmajianpeng ret = md_integrity_register(mddev); 31965aa61f42SNeilBrown if (ret) { 31975aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 3198afa0f557SNeilBrown raid1_free(mddev, conf); 31995aa61f42SNeilBrown } 32005220ea1eSmajianpeng return ret; 32011da177e4SLinus Torvalds } 32021da177e4SLinus Torvalds 3203afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 32041da177e4SLinus Torvalds { 3205afa0f557SNeilBrown struct r1conf *conf = priv; 32064b6d287fSNeilBrown 32071da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 32081da177e4SLinus Torvalds kfree(conf->mirrors); 32090fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 32101da177e4SLinus Torvalds kfree(conf->poolinfo); 3211fd76863eScolyli@suse.de kfree(conf->nr_pending); 3212fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3213fd76863eScolyli@suse.de kfree(conf->nr_queued); 3214fd76863eScolyli@suse.de kfree(conf->barrier); 32151da177e4SLinus Torvalds kfree(conf); 32161da177e4SLinus Torvalds } 32171da177e4SLinus Torvalds 3218fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 32191da177e4SLinus Torvalds { 32201da177e4SLinus Torvalds /* no resync is happening, and there is enough space 32211da177e4SLinus Torvalds * on all devices, so we can resize. 32221da177e4SLinus Torvalds * We need to make sure resync covers any new space. 32231da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 32241da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 32251da177e4SLinus Torvalds * worth it. 32261da177e4SLinus Torvalds */ 3227a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3228a4a6125aSNeilBrown if (mddev->external_size && 3229a4a6125aSNeilBrown mddev->array_sectors > newsize) 3230b522adcdSDan Williams return -EINVAL; 3231a4a6125aSNeilBrown if (mddev->bitmap) { 3232a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3233a4a6125aSNeilBrown if (ret) 3234a4a6125aSNeilBrown return ret; 3235a4a6125aSNeilBrown } 3236a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3237f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 3238449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 3239b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3240b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 324158c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32421da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32431da177e4SLinus Torvalds } 3244b522adcdSDan Williams mddev->dev_sectors = sectors; 32454b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32461da177e4SLinus Torvalds return 0; 32471da177e4SLinus Torvalds } 32481da177e4SLinus Torvalds 3249fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32501da177e4SLinus Torvalds { 32511da177e4SLinus Torvalds /* We need to: 32521da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32531da177e4SLinus Torvalds * 2/ resize conf->mirrors 32541da177e4SLinus Torvalds * 32551da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32561da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32571da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32586ea9c07cSNeilBrown * 32596ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32606ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32611da177e4SLinus Torvalds */ 32621da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 32631da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32640eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3265e8096360SNeilBrown struct r1conf *conf = mddev->private; 326663c70c4fSNeilBrown int cnt, raid_disks; 3267c04be0aaSNeilBrown unsigned long flags; 3268b5470dc5SDan Williams int d, d2, err; 32691da177e4SLinus Torvalds 327063c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3271664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 327263c70c4fSNeilBrown mddev->layout != mddev->new_layout || 327363c70c4fSNeilBrown mddev->level != mddev->new_level) { 3274664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 327563c70c4fSNeilBrown mddev->new_layout = mddev->layout; 327663c70c4fSNeilBrown mddev->new_level = mddev->level; 327763c70c4fSNeilBrown return -EINVAL; 327863c70c4fSNeilBrown } 327963c70c4fSNeilBrown 328028c1b9fdSGoldwyn Rodrigues if (!mddev_is_clustered(mddev)) { 3281b5470dc5SDan Williams err = md_allow_write(mddev); 3282b5470dc5SDan Williams if (err) 3283b5470dc5SDan Williams return err; 328428c1b9fdSGoldwyn Rodrigues } 32852a2275d6SNeilBrown 328663c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 328763c70c4fSNeilBrown 32886ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32896ea9c07cSNeilBrown cnt=0; 32906ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32911da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32926ea9c07cSNeilBrown cnt++; 32936ea9c07cSNeilBrown if (cnt > raid_disks) 32941da177e4SLinus Torvalds return -EBUSY; 32956ea9c07cSNeilBrown } 32961da177e4SLinus Torvalds 32971da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32981da177e4SLinus Torvalds if (!newpoolinfo) 32991da177e4SLinus Torvalds return -ENOMEM; 33001da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 33018f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 33021da177e4SLinus Torvalds 33031da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 33041da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 33051da177e4SLinus Torvalds if (!newpool) { 33061da177e4SLinus Torvalds kfree(newpoolinfo); 33071da177e4SLinus Torvalds return -ENOMEM; 33081da177e4SLinus Torvalds } 33090eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 33108f19ccb2SNeilBrown GFP_KERNEL); 33111da177e4SLinus Torvalds if (!newmirrors) { 33121da177e4SLinus Torvalds kfree(newpoolinfo); 33131da177e4SLinus Torvalds mempool_destroy(newpool); 33141da177e4SLinus Torvalds return -ENOMEM; 33151da177e4SLinus Torvalds } 33161da177e4SLinus Torvalds 3317e2d59925SNeilBrown freeze_array(conf, 0); 33181da177e4SLinus Torvalds 33191da177e4SLinus Torvalds /* ok, everything is stopped */ 33201da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 33211da177e4SLinus Torvalds conf->r1bio_pool = newpool; 33226ea9c07cSNeilBrown 3323a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 33243cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3325a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 332636fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3327a88aa786SNeilBrown rdev->raid_disk = d2; 332836fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 332936fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 33301d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 333136fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3332a88aa786SNeilBrown } 3333a88aa786SNeilBrown if (rdev) 3334a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33356ea9c07cSNeilBrown } 33361da177e4SLinus Torvalds kfree(conf->mirrors); 33371da177e4SLinus Torvalds conf->mirrors = newmirrors; 33381da177e4SLinus Torvalds kfree(conf->poolinfo); 33391da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33401da177e4SLinus Torvalds 3341c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33421da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3343c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33441da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 334563c70c4fSNeilBrown mddev->delta_disks = 0; 33461da177e4SLinus Torvalds 3347e2d59925SNeilBrown unfreeze_array(conf); 33481da177e4SLinus Torvalds 3349985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33501da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33511da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33521da177e4SLinus Torvalds 33531da177e4SLinus Torvalds mempool_destroy(oldpool); 33541da177e4SLinus Torvalds return 0; 33551da177e4SLinus Torvalds } 33561da177e4SLinus Torvalds 3357fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 335836fa3063SNeilBrown { 3359e8096360SNeilBrown struct r1conf *conf = mddev->private; 336036fa3063SNeilBrown 336136fa3063SNeilBrown switch(state) { 33626eef4b21SNeilBrown case 2: /* wake for suspend */ 33636eef4b21SNeilBrown wake_up(&conf->wait_barrier); 33646eef4b21SNeilBrown break; 33659e6603daSNeilBrown case 1: 336607169fd4Smajianpeng freeze_array(conf, 0); 336736fa3063SNeilBrown break; 33689e6603daSNeilBrown case 0: 336907169fd4Smajianpeng unfreeze_array(conf); 337036fa3063SNeilBrown break; 337136fa3063SNeilBrown } 337236fa3063SNeilBrown } 337336fa3063SNeilBrown 3374fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3375709ae487SNeilBrown { 3376709ae487SNeilBrown /* raid1 can take over: 3377709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3378709ae487SNeilBrown */ 3379709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3380e8096360SNeilBrown struct r1conf *conf; 3381709ae487SNeilBrown mddev->new_level = 1; 3382709ae487SNeilBrown mddev->new_layout = 0; 3383709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3384709ae487SNeilBrown conf = setup_conf(mddev); 33856995f0b2SShaohua Li if (!IS_ERR(conf)) { 338607169fd4Smajianpeng /* Array must appear to be quiesced */ 338707169fd4Smajianpeng conf->array_frozen = 1; 3388394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3389394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33906995f0b2SShaohua Li } 3391709ae487SNeilBrown return conf; 3392709ae487SNeilBrown } 3393709ae487SNeilBrown return ERR_PTR(-EINVAL); 3394709ae487SNeilBrown } 33951da177e4SLinus Torvalds 339684fc4b56SNeilBrown static struct md_personality raid1_personality = 33971da177e4SLinus Torvalds { 33981da177e4SLinus Torvalds .name = "raid1", 33992604b703SNeilBrown .level = 1, 34001da177e4SLinus Torvalds .owner = THIS_MODULE, 3401849674e4SShaohua Li .make_request = raid1_make_request, 3402849674e4SShaohua Li .run = raid1_run, 3403afa0f557SNeilBrown .free = raid1_free, 3404849674e4SShaohua Li .status = raid1_status, 3405849674e4SShaohua Li .error_handler = raid1_error, 34061da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 34071da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 34081da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3409849674e4SShaohua Li .sync_request = raid1_sync_request, 34101da177e4SLinus Torvalds .resize = raid1_resize, 341180c3a6ceSDan Williams .size = raid1_size, 341263c70c4fSNeilBrown .check_reshape = raid1_reshape, 341336fa3063SNeilBrown .quiesce = raid1_quiesce, 3414709ae487SNeilBrown .takeover = raid1_takeover, 34155c675f83SNeilBrown .congested = raid1_congested, 34161da177e4SLinus Torvalds }; 34171da177e4SLinus Torvalds 34181da177e4SLinus Torvalds static int __init raid_init(void) 34191da177e4SLinus Torvalds { 34202604b703SNeilBrown return register_md_personality(&raid1_personality); 34211da177e4SLinus Torvalds } 34221da177e4SLinus Torvalds 34231da177e4SLinus Torvalds static void raid_exit(void) 34241da177e4SLinus Torvalds { 34252604b703SNeilBrown unregister_md_personality(&raid1_personality); 34261da177e4SLinus Torvalds } 34271da177e4SLinus Torvalds 34281da177e4SLinus Torvalds module_init(raid_init); 34291da177e4SLinus Torvalds module_exit(raid_exit); 34301da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34310efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34321da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3433d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34342604b703SNeilBrown MODULE_ALIAS("md-level-1"); 343534db0cd6SNeilBrown 343634db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3437