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> 4043b2e5d8SNeilBrown #include "md.h" 41ef740c37SChristoph Hellwig #include "raid1.h" 42ef740c37SChristoph Hellwig #include "bitmap.h" 43191ea9b2SNeilBrown 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 461da177e4SLinus Torvalds */ 471da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 481da177e4SLinus Torvalds 4934db0cd6SNeilBrown /* When there are this many requests queue to be written by 5034db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 5134db0cd6SNeilBrown * for writeback. 5234db0cd6SNeilBrown */ 5334db0cd6SNeilBrown static int max_queued_requests = 1024; 541da177e4SLinus Torvalds 55e8096360SNeilBrown static void allow_barrier(struct r1conf *conf); 56e8096360SNeilBrown static void lower_barrier(struct r1conf *conf); 571da177e4SLinus Torvalds 58dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 591da177e4SLinus Torvalds { 601da177e4SLinus Torvalds struct pool_info *pi = data; 619f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 647eaceaccSJens Axboe return kzalloc(size, gfp_flags); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 681da177e4SLinus Torvalds { 691da177e4SLinus Torvalds kfree(r1_bio); 701da177e4SLinus Torvalds } 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 731da177e4SLinus Torvalds //#define RESYNC_BLOCK_SIZE PAGE_SIZE 741da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 751da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 761da177e4SLinus Torvalds #define RESYNC_WINDOW (2048*1024) 771da177e4SLinus Torvalds 78dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 791da177e4SLinus Torvalds { 801da177e4SLinus Torvalds struct pool_info *pi = data; 811da177e4SLinus Torvalds struct page *page; 829f2c9d12SNeilBrown struct r1bio *r1_bio; 831da177e4SLinus Torvalds struct bio *bio; 841da177e4SLinus Torvalds int i, j; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 877eaceaccSJens Axboe if (!r1_bio) 881da177e4SLinus Torvalds return NULL; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* 911da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 946746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 951da177e4SLinus Torvalds if (!bio) 961da177e4SLinus Torvalds goto out_free_bio; 971da177e4SLinus Torvalds r1_bio->bios[j] = bio; 981da177e4SLinus Torvalds } 991da177e4SLinus Torvalds /* 1001da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 101d11c171eSNeilBrown * the first bio. 102d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 103d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1041da177e4SLinus Torvalds */ 105d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 106d11c171eSNeilBrown j = pi->raid_disks; 107d11c171eSNeilBrown else 108d11c171eSNeilBrown j = 1; 109d11c171eSNeilBrown while(j--) { 110d11c171eSNeilBrown bio = r1_bio->bios[j]; 1111da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1121da177e4SLinus Torvalds page = alloc_page(gfp_flags); 1131da177e4SLinus Torvalds if (unlikely(!page)) 1141da177e4SLinus Torvalds goto out_free_pages; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = page; 117303a0e11SNeilBrown bio->bi_vcnt = i+1; 1181da177e4SLinus Torvalds } 119d11c171eSNeilBrown } 120d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 121d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 122d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 123d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 124d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 125d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 126d11c171eSNeilBrown } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds return r1_bio; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds out_free_pages: 133d11c171eSNeilBrown for (j=0 ; j < pi->raid_disks; j++) 134303a0e11SNeilBrown for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) 135303a0e11SNeilBrown put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); 136d11c171eSNeilBrown j = -1; 1371da177e4SLinus Torvalds out_free_bio: 1381da177e4SLinus Torvalds while (++j < pi->raid_disks) 1391da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1401da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1411da177e4SLinus Torvalds return NULL; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1451da177e4SLinus Torvalds { 1461da177e4SLinus Torvalds struct pool_info *pi = data; 147d11c171eSNeilBrown int i,j; 1489f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 1491da177e4SLinus Torvalds 150d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 151d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 152d11c171eSNeilBrown if (j == 0 || 153d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 154d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1551345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1581da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 163e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 1641da177e4SLinus Torvalds { 1651da177e4SLinus Torvalds int i; 1661da177e4SLinus Torvalds 1678f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1681da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1694367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1701da177e4SLinus Torvalds bio_put(*bio); 1711da177e4SLinus Torvalds *bio = NULL; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 1759f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 1761da177e4SLinus Torvalds { 177e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1801da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 1839f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 1841da177e4SLinus Torvalds { 185e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 1863e198f78SNeilBrown int i; 1873e198f78SNeilBrown 1888f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1893e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 1903e198f78SNeilBrown if (bio->bi_end_io) 1913e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 1923e198f78SNeilBrown } 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 1951da177e4SLinus Torvalds 19617999be4SNeilBrown lower_barrier(conf); 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds 1999f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds unsigned long flags; 202fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 203e8096360SNeilBrown struct r1conf *conf = mddev->private; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2061da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 207ddaf22abSNeilBrown conf->nr_queued ++; 2081da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2091da177e4SLinus Torvalds 21017999be4SNeilBrown wake_up(&conf->wait_barrier); 2111da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2121da177e4SLinus Torvalds } 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds /* 2151da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2161da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2171da177e4SLinus Torvalds * cache layer. 2181da177e4SLinus Torvalds */ 2199f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 220d2eb35acSNeilBrown { 221d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 222d2eb35acSNeilBrown int done; 223e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 224d2eb35acSNeilBrown 225d2eb35acSNeilBrown if (bio->bi_phys_segments) { 226d2eb35acSNeilBrown unsigned long flags; 227d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 228d2eb35acSNeilBrown bio->bi_phys_segments--; 229d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 230d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 231d2eb35acSNeilBrown } else 232d2eb35acSNeilBrown done = 1; 233d2eb35acSNeilBrown 234d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 235d2eb35acSNeilBrown clear_bit(BIO_UPTODATE, &bio->bi_flags); 236d2eb35acSNeilBrown if (done) { 237d2eb35acSNeilBrown bio_endio(bio, 0); 238d2eb35acSNeilBrown /* 239d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 240d2eb35acSNeilBrown * to go idle. 241d2eb35acSNeilBrown */ 242d2eb35acSNeilBrown allow_barrier(conf); 243d2eb35acSNeilBrown } 244d2eb35acSNeilBrown } 245d2eb35acSNeilBrown 2469f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2471da177e4SLinus Torvalds { 2481da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2491da177e4SLinus Torvalds 2504b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2514b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 25236a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2534b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2544b6d287fSNeilBrown (unsigned long long) bio->bi_sector, 2554b6d287fSNeilBrown (unsigned long long) bio->bi_sector + 2564b6d287fSNeilBrown (bio->bi_size >> 9) - 1); 2574b6d287fSNeilBrown 258d2eb35acSNeilBrown call_bio_endio(r1_bio); 2594b6d287fSNeilBrown } 2601da177e4SLinus Torvalds free_r1bio(r1_bio); 2611da177e4SLinus Torvalds } 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds /* 2641da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2651da177e4SLinus Torvalds */ 2669f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 2671da177e4SLinus Torvalds { 268e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2711da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 274ba3ae3beSNamhyung Kim /* 275ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 276ba3ae3beSNamhyung Kim */ 2779f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 278ba3ae3beSNamhyung Kim { 279ba3ae3beSNamhyung Kim int mirror; 28030194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 28130194636SNeilBrown int raid_disks = conf->raid_disks; 282ba3ae3beSNamhyung Kim 2838f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 284ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 285ba3ae3beSNamhyung Kim break; 286ba3ae3beSNamhyung Kim 2878f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 288ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 289ba3ae3beSNamhyung Kim 290ba3ae3beSNamhyung Kim return mirror; 291ba3ae3beSNamhyung Kim } 292ba3ae3beSNamhyung Kim 2936712ecf8SNeilBrown static void raid1_end_read_request(struct bio *bio, int error) 2941da177e4SLinus Torvalds { 2951da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2969f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 2971da177e4SLinus Torvalds int mirror; 298e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2991da177e4SLinus Torvalds 3001da177e4SLinus Torvalds mirror = r1_bio->read_disk; 3011da177e4SLinus Torvalds /* 3021da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3031da177e4SLinus Torvalds */ 304ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 305ddaf22abSNeilBrown 306220946c9SNeilBrown if (uptodate) 3071da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 308dd00a99eSNeilBrown else { 309dd00a99eSNeilBrown /* If all other devices have failed, we want to return 310dd00a99eSNeilBrown * the error upwards rather than fail the last device. 311dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 312dd00a99eSNeilBrown */ 313dd00a99eSNeilBrown unsigned long flags; 314dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 315dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 316dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 317dd00a99eSNeilBrown !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) 318dd00a99eSNeilBrown uptodate = 1; 319dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 320dd00a99eSNeilBrown } 3211da177e4SLinus Torvalds 322dd00a99eSNeilBrown if (uptodate) 3231da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 324dd00a99eSNeilBrown else { 3251da177e4SLinus Torvalds /* 3261da177e4SLinus Torvalds * oops, read error: 3271da177e4SLinus Torvalds */ 3281da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3298bda470eSChristian Dietrich printk_ratelimited( 3308bda470eSChristian Dietrich KERN_ERR "md/raid1:%s: %s: " 3318bda470eSChristian Dietrich "rescheduling sector %llu\n", 3329dd1e2faSNeilBrown mdname(conf->mddev), 3338bda470eSChristian Dietrich bdevname(conf->mirrors[mirror].rdev->bdev, 3348bda470eSChristian Dietrich b), 3358bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 336d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3371da177e4SLinus Torvalds reschedule_retry(r1_bio); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 3439f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3444e78064fSNeilBrown { 3454e78064fSNeilBrown /* it really is the end of this request */ 3464e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3474e78064fSNeilBrown /* free extra copy of the data pages */ 348af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3494e78064fSNeilBrown while (i--) 3502ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3512ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3522ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3534e78064fSNeilBrown } 3544e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3554e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3564e78064fSNeilBrown r1_bio->sectors, 3574e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 358af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3594e78064fSNeilBrown md_write_end(r1_bio->mddev); 360cd5ff9a1SNeilBrown } 361cd5ff9a1SNeilBrown 3629f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 363cd5ff9a1SNeilBrown { 364cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 365cd5ff9a1SNeilBrown return; 366cd5ff9a1SNeilBrown 367cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 368cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 369cd5ff9a1SNeilBrown else { 370cd5ff9a1SNeilBrown close_write(r1_bio); 3714367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3724367af55SNeilBrown reschedule_retry(r1_bio); 3734367af55SNeilBrown else 3744e78064fSNeilBrown raid_end_bio_io(r1_bio); 3754e78064fSNeilBrown } 3764e78064fSNeilBrown } 3774e78064fSNeilBrown 3786712ecf8SNeilBrown static void raid1_end_write_request(struct bio *bio, int error) 3791da177e4SLinus Torvalds { 3801da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3819f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 382a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 383e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 38404b857f7SNeilBrown struct bio *to_put = NULL; 3851da177e4SLinus Torvalds 386ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 3871da177e4SLinus Torvalds 3881da177e4SLinus Torvalds /* 389e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 3901da177e4SLinus Torvalds */ 391191ea9b2SNeilBrown if (!uptodate) { 392cd5ff9a1SNeilBrown set_bit(WriteErrorSeen, 393cd5ff9a1SNeilBrown &conf->mirrors[mirror].rdev->flags); 39419d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 39519d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 39619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 39719d67169SNeilBrown conf->mddev->recovery); 39819d67169SNeilBrown 399cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4004367af55SNeilBrown } else { 4011da177e4SLinus Torvalds /* 402e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 403e9c7469bSTejun Heo * will return a good error code for to the higher 404e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 405e9c7469bSTejun Heo * fails. 4061da177e4SLinus Torvalds * 407e9c7469bSTejun Heo * The 'master' represents the composite IO operation 408e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 409e9c7469bSTejun Heo * will wait for the 'master' bio. 4101da177e4SLinus Torvalds */ 4114367af55SNeilBrown sector_t first_bad; 4124367af55SNeilBrown int bad_sectors; 4134367af55SNeilBrown 414cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 415cd5ff9a1SNeilBrown to_put = bio; 4161da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4171da177e4SLinus Torvalds 4184367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 4194367af55SNeilBrown if (is_badblock(conf->mirrors[mirror].rdev, 4204367af55SNeilBrown r1_bio->sector, r1_bio->sectors, 4214367af55SNeilBrown &first_bad, &bad_sectors)) { 4224367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4234367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4244367af55SNeilBrown } 4254367af55SNeilBrown } 4264367af55SNeilBrown 4274b6d287fSNeilBrown if (behind) { 4284b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 4294b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4304b6d287fSNeilBrown 431e9c7469bSTejun Heo /* 432e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 433e9c7469bSTejun Heo * has safely reached all non-writemostly 434e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 435e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 436e9c7469bSTejun Heo * -EIO here, instead we'll wait 437e9c7469bSTejun Heo */ 4384b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4394b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4404b6d287fSNeilBrown /* Maybe we can return now */ 4414b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4424b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 44336a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 44436a4e1feSNeilBrown " %llu-%llu\n", 4454b6d287fSNeilBrown (unsigned long long) mbio->bi_sector, 4464b6d287fSNeilBrown (unsigned long long) mbio->bi_sector + 4474b6d287fSNeilBrown (mbio->bi_size >> 9) - 1); 448d2eb35acSNeilBrown call_bio_endio(r1_bio); 4494b6d287fSNeilBrown } 4504b6d287fSNeilBrown } 4514b6d287fSNeilBrown } 4524367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 4534367af55SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, 4544367af55SNeilBrown conf->mddev); 455e9c7469bSTejun Heo 4561da177e4SLinus Torvalds /* 4571da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4581da177e4SLinus Torvalds * already. 4591da177e4SLinus Torvalds */ 460af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 461c70810b3SNeilBrown 46204b857f7SNeilBrown if (to_put) 46304b857f7SNeilBrown bio_put(to_put); 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds /* 4681da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4691da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4701da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4711da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4721da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 4731da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 4741da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 4751da177e4SLinus Torvalds * 4761da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 4771da177e4SLinus Torvalds * because position is mirror, not device based. 4781da177e4SLinus Torvalds * 4791da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 4801da177e4SLinus Torvalds */ 481e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 4821da177e4SLinus Torvalds { 483af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 484d2eb35acSNeilBrown int sectors; 485d2eb35acSNeilBrown int best_good_sectors; 486f3ac8bf7SNeilBrown int start_disk; 48776073054SNeilBrown int best_disk; 488f3ac8bf7SNeilBrown int i; 48976073054SNeilBrown sector_t best_dist; 4903cb03002SNeilBrown struct md_rdev *rdev; 491f3ac8bf7SNeilBrown int choose_first; 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds rcu_read_lock(); 4941da177e4SLinus Torvalds /* 4958ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 4961da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 4971da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 4981da177e4SLinus Torvalds */ 4991da177e4SLinus Torvalds retry: 500d2eb35acSNeilBrown sectors = r1_bio->sectors; 50176073054SNeilBrown best_disk = -1; 50276073054SNeilBrown best_dist = MaxSector; 503d2eb35acSNeilBrown best_good_sectors = 0; 504d2eb35acSNeilBrown 5051da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 5061da177e4SLinus Torvalds (this_sector + sectors >= conf->next_resync)) { 507f3ac8bf7SNeilBrown choose_first = 1; 508f3ac8bf7SNeilBrown start_disk = 0; 509f3ac8bf7SNeilBrown } else { 510f3ac8bf7SNeilBrown choose_first = 0; 511f3ac8bf7SNeilBrown start_disk = conf->last_used; 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds 5148f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) { 51576073054SNeilBrown sector_t dist; 516d2eb35acSNeilBrown sector_t first_bad; 517d2eb35acSNeilBrown int bad_sectors; 518d2eb35acSNeilBrown 519f3ac8bf7SNeilBrown int disk = start_disk + i; 520f3ac8bf7SNeilBrown if (disk >= conf->raid_disks) 521f3ac8bf7SNeilBrown disk -= conf->raid_disks; 5228ddf9efeSNeilBrown 523f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 524f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 525f3ac8bf7SNeilBrown || rdev == NULL 5266b740b8dSNeilBrown || test_bit(Unmerged, &rdev->flags) 52776073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 528f3ac8bf7SNeilBrown continue; 52976073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 53076073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 53176073054SNeilBrown continue; 53276073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 53376073054SNeilBrown /* Don't balance among write-mostly, just 53476073054SNeilBrown * use the first as a last resort */ 535307729c8SNeilBrown if (best_disk < 0) { 536307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 537307729c8SNeilBrown &first_bad, &bad_sectors)) { 538307729c8SNeilBrown if (first_bad < this_sector) 539307729c8SNeilBrown /* Cannot use this */ 540307729c8SNeilBrown continue; 541307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 542307729c8SNeilBrown } else 543307729c8SNeilBrown best_good_sectors = sectors; 54476073054SNeilBrown best_disk = disk; 545307729c8SNeilBrown } 54676073054SNeilBrown continue; 5478ddf9efeSNeilBrown } 54876073054SNeilBrown /* This is a reasonable device to use. It might 54976073054SNeilBrown * even be best. 5501da177e4SLinus Torvalds */ 551d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 552d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 553d2eb35acSNeilBrown if (best_dist < MaxSector) 554d2eb35acSNeilBrown /* already have a better device */ 555d2eb35acSNeilBrown continue; 556d2eb35acSNeilBrown if (first_bad <= this_sector) { 557d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 558d2eb35acSNeilBrown * device, then we must not read beyond 559d2eb35acSNeilBrown * bad_sectors from another device.. 560d2eb35acSNeilBrown */ 561d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 562d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 563d2eb35acSNeilBrown sectors = bad_sectors; 564d2eb35acSNeilBrown if (best_good_sectors > sectors) 565d2eb35acSNeilBrown best_good_sectors = sectors; 566d2eb35acSNeilBrown 567d2eb35acSNeilBrown } else { 568d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 569d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 570d2eb35acSNeilBrown best_good_sectors = good_sectors; 571d2eb35acSNeilBrown best_disk = disk; 572d2eb35acSNeilBrown } 573d2eb35acSNeilBrown if (choose_first) 574d2eb35acSNeilBrown break; 575d2eb35acSNeilBrown } 576d2eb35acSNeilBrown continue; 577d2eb35acSNeilBrown } else 578d2eb35acSNeilBrown best_good_sectors = sectors; 579d2eb35acSNeilBrown 58076073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 58176073054SNeilBrown if (choose_first 58276073054SNeilBrown /* Don't change to another disk for sequential reads */ 58376073054SNeilBrown || conf->next_seq_sect == this_sector 58476073054SNeilBrown || dist == 0 58576073054SNeilBrown /* If device is idle, use it */ 58676073054SNeilBrown || atomic_read(&rdev->nr_pending) == 0) { 58776073054SNeilBrown best_disk = disk; 5881da177e4SLinus Torvalds break; 5891da177e4SLinus Torvalds } 59076073054SNeilBrown if (dist < best_dist) { 59176073054SNeilBrown best_dist = dist; 59276073054SNeilBrown best_disk = disk; 5931da177e4SLinus Torvalds } 594f3ac8bf7SNeilBrown } 5951da177e4SLinus Torvalds 59676073054SNeilBrown if (best_disk >= 0) { 59776073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 5988ddf9efeSNeilBrown if (!rdev) 5998ddf9efeSNeilBrown goto retry; 6008ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 60176073054SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 6021da177e4SLinus Torvalds /* cannot risk returning a device that failed 6031da177e4SLinus Torvalds * before we inc'ed nr_pending 6041da177e4SLinus Torvalds */ 60503c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 6061da177e4SLinus Torvalds goto retry; 6071da177e4SLinus Torvalds } 608d2eb35acSNeilBrown sectors = best_good_sectors; 6098ddf9efeSNeilBrown conf->next_seq_sect = this_sector + sectors; 61076073054SNeilBrown conf->last_used = best_disk; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds rcu_read_unlock(); 613d2eb35acSNeilBrown *max_sectors = sectors; 6141da177e4SLinus Torvalds 61576073054SNeilBrown return best_disk; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6186b740b8dSNeilBrown static int raid1_mergeable_bvec(struct request_queue *q, 6196b740b8dSNeilBrown struct bvec_merge_data *bvm, 6206b740b8dSNeilBrown struct bio_vec *biovec) 6216b740b8dSNeilBrown { 6226b740b8dSNeilBrown struct mddev *mddev = q->queuedata; 6236b740b8dSNeilBrown struct r1conf *conf = mddev->private; 6246b740b8dSNeilBrown sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); 6256b740b8dSNeilBrown int max = biovec->bv_len; 6266b740b8dSNeilBrown 6276b740b8dSNeilBrown if (mddev->merge_check_needed) { 6286b740b8dSNeilBrown int disk; 6296b740b8dSNeilBrown rcu_read_lock(); 6306b740b8dSNeilBrown for (disk = 0; disk < conf->raid_disks * 2; disk++) { 6316b740b8dSNeilBrown struct md_rdev *rdev = rcu_dereference( 6326b740b8dSNeilBrown conf->mirrors[disk].rdev); 6336b740b8dSNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 6346b740b8dSNeilBrown struct request_queue *q = 6356b740b8dSNeilBrown bdev_get_queue(rdev->bdev); 6366b740b8dSNeilBrown if (q->merge_bvec_fn) { 6376b740b8dSNeilBrown bvm->bi_sector = sector + 6386b740b8dSNeilBrown rdev->data_offset; 6396b740b8dSNeilBrown bvm->bi_bdev = rdev->bdev; 6406b740b8dSNeilBrown max = min(max, q->merge_bvec_fn( 6416b740b8dSNeilBrown q, bvm, biovec)); 6426b740b8dSNeilBrown } 6436b740b8dSNeilBrown } 6446b740b8dSNeilBrown } 6456b740b8dSNeilBrown rcu_read_unlock(); 6466b740b8dSNeilBrown } 6476b740b8dSNeilBrown return max; 6486b740b8dSNeilBrown 6496b740b8dSNeilBrown } 6506b740b8dSNeilBrown 651fd01b88cSNeilBrown int md_raid1_congested(struct mddev *mddev, int bits) 6520d129228SNeilBrown { 653e8096360SNeilBrown struct r1conf *conf = mddev->private; 6540d129228SNeilBrown int i, ret = 0; 6550d129228SNeilBrown 65634db0cd6SNeilBrown if ((bits & (1 << BDI_async_congested)) && 65734db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 65834db0cd6SNeilBrown return 1; 65934db0cd6SNeilBrown 6600d129228SNeilBrown rcu_read_lock(); 661f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 6623cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 6630d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 664165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 6650d129228SNeilBrown 6661ed7242eSJonathan Brassow BUG_ON(!q); 6671ed7242eSJonathan Brassow 6680d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 6690d129228SNeilBrown * non-congested targets, it can be removed 6700d129228SNeilBrown */ 67191a9e99dSAlexander Beregalov if ((bits & (1<<BDI_async_congested)) || 1) 6720d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 6730d129228SNeilBrown else 6740d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 6750d129228SNeilBrown } 6760d129228SNeilBrown } 6770d129228SNeilBrown rcu_read_unlock(); 6780d129228SNeilBrown return ret; 6790d129228SNeilBrown } 6801ed7242eSJonathan Brassow EXPORT_SYMBOL_GPL(md_raid1_congested); 6810d129228SNeilBrown 6821ed7242eSJonathan Brassow static int raid1_congested(void *data, int bits) 6831ed7242eSJonathan Brassow { 684fd01b88cSNeilBrown struct mddev *mddev = data; 6851ed7242eSJonathan Brassow 6861ed7242eSJonathan Brassow return mddev_congested(mddev, bits) || 6871ed7242eSJonathan Brassow md_raid1_congested(mddev, bits); 6881ed7242eSJonathan Brassow } 6890d129228SNeilBrown 690e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 691a35e63efSNeilBrown { 692a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 693a35e63efSNeilBrown * bitmap updates get flushed here. 694a35e63efSNeilBrown */ 695a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 696a35e63efSNeilBrown 697a35e63efSNeilBrown if (conf->pending_bio_list.head) { 698a35e63efSNeilBrown struct bio *bio; 699a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 70034db0cd6SNeilBrown conf->pending_count = 0; 701a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 702a35e63efSNeilBrown /* flush any pending bitmap writes to 703a35e63efSNeilBrown * disk before proceeding w/ I/O */ 704a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 70534db0cd6SNeilBrown wake_up(&conf->wait_barrier); 706a35e63efSNeilBrown 707a35e63efSNeilBrown while (bio) { /* submit pending writes */ 708a35e63efSNeilBrown struct bio *next = bio->bi_next; 709a35e63efSNeilBrown bio->bi_next = NULL; 710a35e63efSNeilBrown generic_make_request(bio); 711a35e63efSNeilBrown bio = next; 712a35e63efSNeilBrown } 713a35e63efSNeilBrown } else 714a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 7157eaceaccSJens Axboe } 7167eaceaccSJens Axboe 71717999be4SNeilBrown /* Barriers.... 71817999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 71917999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 72017999be4SNeilBrown * To do this we raise a 'barrier'. 72117999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 72217999be4SNeilBrown * to count how many activities are happening which preclude 72317999be4SNeilBrown * normal IO. 72417999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 72517999be4SNeilBrown * i.e. if nr_pending == 0. 72617999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 72717999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 72817999be4SNeilBrown * is ready, no other operations which require a barrier will start 72917999be4SNeilBrown * until the IO request has had a chance. 73017999be4SNeilBrown * 73117999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 73217999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 73317999be4SNeilBrown * allow_barrier when it has finished its IO. 73417999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 73517999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 73617999be4SNeilBrown * lower_barrier when the particular background IO completes. 7371da177e4SLinus Torvalds */ 7381da177e4SLinus Torvalds #define RESYNC_DEPTH 32 7391da177e4SLinus Torvalds 740e8096360SNeilBrown static void raise_barrier(struct r1conf *conf) 7411da177e4SLinus Torvalds { 7421da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 7431da177e4SLinus Torvalds 74417999be4SNeilBrown /* Wait until no block IO is waiting */ 74517999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 746c3b328acSNeilBrown conf->resync_lock, ); 74717999be4SNeilBrown 74817999be4SNeilBrown /* block any new IO from starting */ 74917999be4SNeilBrown conf->barrier++; 75017999be4SNeilBrown 751046abeedSNeilBrown /* Now wait for all pending IO to complete */ 75217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 75317999be4SNeilBrown !conf->nr_pending && conf->barrier < RESYNC_DEPTH, 754c3b328acSNeilBrown conf->resync_lock, ); 75517999be4SNeilBrown 7561da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 759e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 76017999be4SNeilBrown { 76117999be4SNeilBrown unsigned long flags; 762709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 76317999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 76417999be4SNeilBrown conf->barrier--; 76517999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 76617999be4SNeilBrown wake_up(&conf->wait_barrier); 76717999be4SNeilBrown } 76817999be4SNeilBrown 769e8096360SNeilBrown static void wait_barrier(struct r1conf *conf) 77017999be4SNeilBrown { 77117999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 77217999be4SNeilBrown if (conf->barrier) { 77317999be4SNeilBrown conf->nr_waiting++; 774d6b42dcbSNeilBrown /* Wait for the barrier to drop. 775d6b42dcbSNeilBrown * However if there are already pending 776d6b42dcbSNeilBrown * requests (preventing the barrier from 777d6b42dcbSNeilBrown * rising completely), and the 778d6b42dcbSNeilBrown * pre-process bio queue isn't empty, 779d6b42dcbSNeilBrown * then don't wait, as we need to empty 780d6b42dcbSNeilBrown * that queue to get the nr_pending 781d6b42dcbSNeilBrown * count down. 782d6b42dcbSNeilBrown */ 783d6b42dcbSNeilBrown wait_event_lock_irq(conf->wait_barrier, 784d6b42dcbSNeilBrown !conf->barrier || 785d6b42dcbSNeilBrown (conf->nr_pending && 786d6b42dcbSNeilBrown current->bio_list && 787d6b42dcbSNeilBrown !bio_list_empty(current->bio_list)), 78817999be4SNeilBrown conf->resync_lock, 789c3b328acSNeilBrown ); 79017999be4SNeilBrown conf->nr_waiting--; 79117999be4SNeilBrown } 79217999be4SNeilBrown conf->nr_pending++; 79317999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 79417999be4SNeilBrown } 79517999be4SNeilBrown 796e8096360SNeilBrown static void allow_barrier(struct r1conf *conf) 79717999be4SNeilBrown { 79817999be4SNeilBrown unsigned long flags; 79917999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 80017999be4SNeilBrown conf->nr_pending--; 80117999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 80217999be4SNeilBrown wake_up(&conf->wait_barrier); 80317999be4SNeilBrown } 80417999be4SNeilBrown 805e8096360SNeilBrown static void freeze_array(struct r1conf *conf) 806ddaf22abSNeilBrown { 807ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 808ddaf22abSNeilBrown * go quite. 809ddaf22abSNeilBrown * We increment barrier and nr_waiting, and then 8101c830532SNeilBrown * wait until nr_pending match nr_queued+1 8111c830532SNeilBrown * This is called in the context of one normal IO request 8121c830532SNeilBrown * that has failed. Thus any sync request that might be pending 8131c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 8141c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 8151c830532SNeilBrown * Thus the number queued (nr_queued) plus this request (1) 8161c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 8171c830532SNeilBrown * we continue. 818ddaf22abSNeilBrown */ 819ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 820ddaf22abSNeilBrown conf->barrier++; 821ddaf22abSNeilBrown conf->nr_waiting++; 822ddaf22abSNeilBrown wait_event_lock_irq(conf->wait_barrier, 8231c830532SNeilBrown conf->nr_pending == conf->nr_queued+1, 824ddaf22abSNeilBrown conf->resync_lock, 825c3b328acSNeilBrown flush_pending_writes(conf)); 826ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 827ddaf22abSNeilBrown } 828e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 829ddaf22abSNeilBrown { 830ddaf22abSNeilBrown /* reverse the effect of the freeze */ 831ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 832ddaf22abSNeilBrown conf->barrier--; 833ddaf22abSNeilBrown conf->nr_waiting--; 834ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 835ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 836ddaf22abSNeilBrown } 837ddaf22abSNeilBrown 83817999be4SNeilBrown 8394e78064fSNeilBrown /* duplicate the data pages for behind I/O 8404e78064fSNeilBrown */ 8419f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 8424b6d287fSNeilBrown { 8434b6d287fSNeilBrown int i; 8444b6d287fSNeilBrown struct bio_vec *bvec; 8452ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 8464b6d287fSNeilBrown GFP_NOIO); 8472ca68f5eSNeilBrown if (unlikely(!bvecs)) 848af6d7b76SNeilBrown return; 8494b6d287fSNeilBrown 8504b6d287fSNeilBrown bio_for_each_segment(bvec, bio, i) { 8512ca68f5eSNeilBrown bvecs[i] = *bvec; 8522ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 8532ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 8544b6d287fSNeilBrown goto do_sync_io; 8552ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 8564b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 8572ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 8584b6d287fSNeilBrown kunmap(bvec->bv_page); 8594b6d287fSNeilBrown } 8602ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 861af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 862af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 863af6d7b76SNeilBrown return; 8644b6d287fSNeilBrown 8654b6d287fSNeilBrown do_sync_io: 866af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 8672ca68f5eSNeilBrown if (bvecs[i].bv_page) 8682ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 8692ca68f5eSNeilBrown kfree(bvecs); 87036a4e1feSNeilBrown pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); 8714b6d287fSNeilBrown } 8724b6d287fSNeilBrown 873b4fdcb02SLinus Torvalds static void make_request(struct mddev *mddev, struct bio * bio) 8741da177e4SLinus Torvalds { 875e8096360SNeilBrown struct r1conf *conf = mddev->private; 8760f6d02d5SNeilBrown struct mirror_info *mirror; 8779f2c9d12SNeilBrown struct r1bio *r1_bio; 8781da177e4SLinus Torvalds struct bio *read_bio; 8791f68f0c4SNeilBrown int i, disks; 88084255d10SNeilBrown struct bitmap *bitmap; 881191ea9b2SNeilBrown unsigned long flags; 882a362357bSJens Axboe const int rw = bio_data_dir(bio); 8832c7d46ecSNeilBrown const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); 884e9c7469bSTejun Heo const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); 8853cb03002SNeilBrown struct md_rdev *blocked_rdev; 886c3b328acSNeilBrown int plugged; 8871f68f0c4SNeilBrown int first_clone; 8881f68f0c4SNeilBrown int sectors_handled; 8891f68f0c4SNeilBrown int max_sectors; 890191ea9b2SNeilBrown 8911da177e4SLinus Torvalds /* 8921da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 8931da177e4SLinus Torvalds * thread has put up a bar for new requests. 8941da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 8951da177e4SLinus Torvalds */ 89662de608dSNeilBrown 8973d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 8983d310eb7SNeilBrown 8996eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 9006eef4b21SNeilBrown bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && 9016eef4b21SNeilBrown bio->bi_sector < mddev->suspend_hi) { 9026eef4b21SNeilBrown /* As the suspend_* range is controlled by 9036eef4b21SNeilBrown * userspace, we want an interruptible 9046eef4b21SNeilBrown * wait. 9056eef4b21SNeilBrown */ 9066eef4b21SNeilBrown DEFINE_WAIT(w); 9076eef4b21SNeilBrown for (;;) { 9086eef4b21SNeilBrown flush_signals(current); 9096eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 9106eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 9116eef4b21SNeilBrown if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || 9126eef4b21SNeilBrown bio->bi_sector >= mddev->suspend_hi) 9136eef4b21SNeilBrown break; 9146eef4b21SNeilBrown schedule(); 9156eef4b21SNeilBrown } 9166eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 9176eef4b21SNeilBrown } 91862de608dSNeilBrown 91917999be4SNeilBrown wait_barrier(conf); 9201da177e4SLinus Torvalds 92184255d10SNeilBrown bitmap = mddev->bitmap; 92284255d10SNeilBrown 9231da177e4SLinus Torvalds /* 9241da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 9251da177e4SLinus Torvalds * used and no empty request is available. 9261da177e4SLinus Torvalds * 9271da177e4SLinus Torvalds */ 9281da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds r1_bio->master_bio = bio; 9311da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 932191ea9b2SNeilBrown r1_bio->state = 0; 9331da177e4SLinus Torvalds r1_bio->mddev = mddev; 9341da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 9351da177e4SLinus Torvalds 936d2eb35acSNeilBrown /* We might need to issue multiple reads to different 937d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 938d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 939d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 940d2eb35acSNeilBrown * will be needed when requests complete. If it is 941d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 942d2eb35acSNeilBrown */ 943d2eb35acSNeilBrown bio->bi_phys_segments = 0; 944d2eb35acSNeilBrown clear_bit(BIO_SEG_VALID, &bio->bi_flags); 945d2eb35acSNeilBrown 946a362357bSJens Axboe if (rw == READ) { 9471da177e4SLinus Torvalds /* 9481da177e4SLinus Torvalds * read balancing logic: 9491da177e4SLinus Torvalds */ 950d2eb35acSNeilBrown int rdisk; 951d2eb35acSNeilBrown 952d2eb35acSNeilBrown read_again: 953d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds if (rdisk < 0) { 9561da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 9571da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 9585a7bbad2SChristoph Hellwig return; 9591da177e4SLinus Torvalds } 9601da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 9611da177e4SLinus Torvalds 962e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 963e555190dSNeilBrown bitmap) { 964e555190dSNeilBrown /* Reading from a write-mostly device must 965e555190dSNeilBrown * take care not to over-take any writes 966e555190dSNeilBrown * that are 'behind' 967e555190dSNeilBrown */ 968e555190dSNeilBrown wait_event(bitmap->behind_wait, 969e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 970e555190dSNeilBrown } 9711da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 9721da177e4SLinus Torvalds 973a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 974d2eb35acSNeilBrown md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, 975d2eb35acSNeilBrown max_sectors); 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 9801da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 9811da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 9827b6d91daSChristoph Hellwig read_bio->bi_rw = READ | do_sync; 9831da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 9841da177e4SLinus Torvalds 985d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 986d2eb35acSNeilBrown /* could not read all from this device, so we will 987d2eb35acSNeilBrown * need another r1_bio. 988d2eb35acSNeilBrown */ 989d2eb35acSNeilBrown 990d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 991d2eb35acSNeilBrown - bio->bi_sector); 992d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 993d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 994d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 995d2eb35acSNeilBrown bio->bi_phys_segments = 2; 996d2eb35acSNeilBrown else 997d2eb35acSNeilBrown bio->bi_phys_segments++; 998d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 999d2eb35acSNeilBrown /* Cannot call generic_make_request directly 1000d2eb35acSNeilBrown * as that will be queued in __make_request 1001d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 1002d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 1003d2eb35acSNeilBrown */ 1004d2eb35acSNeilBrown reschedule_retry(r1_bio); 1005d2eb35acSNeilBrown 1006d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1007d2eb35acSNeilBrown 1008d2eb35acSNeilBrown r1_bio->master_bio = bio; 1009d2eb35acSNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 1010d2eb35acSNeilBrown r1_bio->state = 0; 1011d2eb35acSNeilBrown r1_bio->mddev = mddev; 1012d2eb35acSNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 1013d2eb35acSNeilBrown goto read_again; 1014d2eb35acSNeilBrown } else 10151da177e4SLinus Torvalds generic_make_request(read_bio); 10165a7bbad2SChristoph Hellwig return; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* 10201da177e4SLinus Torvalds * WRITE: 10211da177e4SLinus Torvalds */ 102234db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 102334db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 102434db0cd6SNeilBrown wait_event(conf->wait_barrier, 102534db0cd6SNeilBrown conf->pending_count < max_queued_requests); 102634db0cd6SNeilBrown } 10271f68f0c4SNeilBrown /* first select target devices under rcu_lock and 10281da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 10291da177e4SLinus Torvalds * bios[x] to bio 10301f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 10311f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 10321f68f0c4SNeilBrown * blocks. 10331f68f0c4SNeilBrown * This potentially requires several writes to write around 10341f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 10351f68f0c4SNeilBrown * with a set of bios attached. 10361da177e4SLinus Torvalds */ 1037c3b328acSNeilBrown plugged = mddev_check_plugged(mddev); 1038c3b328acSNeilBrown 10398f19ccb2SNeilBrown disks = conf->raid_disks * 2; 10406bfe0b49SDan Williams retry_write: 10416bfe0b49SDan Williams blocked_rdev = NULL; 10421da177e4SLinus Torvalds rcu_read_lock(); 10431f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 10441da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 10453cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 10466bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 10476bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 10486bfe0b49SDan Williams blocked_rdev = rdev; 10496bfe0b49SDan Williams break; 10506bfe0b49SDan Williams } 10511da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 10526b740b8dSNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags) 10536b740b8dSNeilBrown || test_bit(Unmerged, &rdev->flags)) { 10548f19ccb2SNeilBrown if (i < conf->raid_disks) 10551f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 10561f68f0c4SNeilBrown continue; 1057964147d5SNeilBrown } 10581f68f0c4SNeilBrown 10591f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 10601f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 10611f68f0c4SNeilBrown sector_t first_bad; 10621f68f0c4SNeilBrown int bad_sectors; 10631f68f0c4SNeilBrown int is_bad; 10641f68f0c4SNeilBrown 10651f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 10661f68f0c4SNeilBrown max_sectors, 10671f68f0c4SNeilBrown &first_bad, &bad_sectors); 10681f68f0c4SNeilBrown if (is_bad < 0) { 10691f68f0c4SNeilBrown /* mustn't write here until the bad block is 10701f68f0c4SNeilBrown * acknowledged*/ 10711f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 10721f68f0c4SNeilBrown blocked_rdev = rdev; 10731f68f0c4SNeilBrown break; 10741f68f0c4SNeilBrown } 10751f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 10761f68f0c4SNeilBrown /* Cannot write here at all */ 10771f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 10781f68f0c4SNeilBrown if (bad_sectors < max_sectors) 10791f68f0c4SNeilBrown /* mustn't write more than bad_sectors 10801f68f0c4SNeilBrown * to other devices yet 10811f68f0c4SNeilBrown */ 10821f68f0c4SNeilBrown max_sectors = bad_sectors; 10831f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 10841f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 10851f68f0c4SNeilBrown * only applies if the disk is 10861f68f0c4SNeilBrown * missing, so it might be re-added, 10871f68f0c4SNeilBrown * and we want to know to recover this 10881f68f0c4SNeilBrown * chunk. 10891f68f0c4SNeilBrown * In this case the device is here, 10901f68f0c4SNeilBrown * and the fact that this chunk is not 10911f68f0c4SNeilBrown * in-sync is recorded in the bad 10921f68f0c4SNeilBrown * block log 10931f68f0c4SNeilBrown */ 10941f68f0c4SNeilBrown continue; 10951f68f0c4SNeilBrown } 10961f68f0c4SNeilBrown if (is_bad) { 10971f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 10981f68f0c4SNeilBrown if (good_sectors < max_sectors) 10991f68f0c4SNeilBrown max_sectors = good_sectors; 11001f68f0c4SNeilBrown } 11011f68f0c4SNeilBrown } 11021f68f0c4SNeilBrown r1_bio->bios[i] = bio; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds rcu_read_unlock(); 11051da177e4SLinus Torvalds 11066bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 11076bfe0b49SDan Williams /* Wait for this device to become unblocked */ 11086bfe0b49SDan Williams int j; 11096bfe0b49SDan Williams 11106bfe0b49SDan Williams for (j = 0; j < i; j++) 11116bfe0b49SDan Williams if (r1_bio->bios[j]) 11126bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 11131f68f0c4SNeilBrown r1_bio->state = 0; 11146bfe0b49SDan Williams allow_barrier(conf); 11156bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 11166bfe0b49SDan Williams wait_barrier(conf); 11176bfe0b49SDan Williams goto retry_write; 11186bfe0b49SDan Williams } 11196bfe0b49SDan Williams 11201f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 11211f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 11221f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 11231f68f0c4SNeilBrown */ 11241f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 11251f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 11261f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 11271f68f0c4SNeilBrown bio->bi_phys_segments = 2; 11281f68f0c4SNeilBrown else 11291f68f0c4SNeilBrown bio->bi_phys_segments++; 11301f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1131191ea9b2SNeilBrown } 11321f68f0c4SNeilBrown sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; 11334b6d287fSNeilBrown 11344e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 11354b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1136191ea9b2SNeilBrown 11371f68f0c4SNeilBrown first_clone = 1; 11381da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 11391da177e4SLinus Torvalds struct bio *mbio; 11401da177e4SLinus Torvalds if (!r1_bio->bios[i]) 11411da177e4SLinus Torvalds continue; 11421da177e4SLinus Torvalds 1143a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 11441f68f0c4SNeilBrown md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); 11451da177e4SLinus Torvalds 11461f68f0c4SNeilBrown if (first_clone) { 11471f68f0c4SNeilBrown /* do behind I/O ? 11481f68f0c4SNeilBrown * Not if there are too many, or cannot 11491f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 11501f68f0c4SNeilBrown * is waiting for behind writes to flush */ 11511f68f0c4SNeilBrown if (bitmap && 11521f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 11531f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 11541f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 11551f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 11561da177e4SLinus Torvalds 11571f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 11581f68f0c4SNeilBrown r1_bio->sectors, 11591f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 11601f68f0c4SNeilBrown &r1_bio->state)); 11611f68f0c4SNeilBrown first_clone = 0; 11621f68f0c4SNeilBrown } 11632ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 11644b6d287fSNeilBrown struct bio_vec *bvec; 11654b6d287fSNeilBrown int j; 11664b6d287fSNeilBrown 11674b6d287fSNeilBrown /* Yes, I really want the '__' version so that 11684b6d287fSNeilBrown * we clear any unused pointer in the io_vec, rather 11694b6d287fSNeilBrown * than leave them unchanged. This is important 11704b6d287fSNeilBrown * because when we come to free the pages, we won't 1171046abeedSNeilBrown * know the original bi_idx, so we just free 11724b6d287fSNeilBrown * them all 11734b6d287fSNeilBrown */ 11744b6d287fSNeilBrown __bio_for_each_segment(bvec, mbio, j, 0) 11752ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 11764b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 11774b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 11784b6d287fSNeilBrown } 11794b6d287fSNeilBrown 11801f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 11811f68f0c4SNeilBrown 11821f68f0c4SNeilBrown mbio->bi_sector = (r1_bio->sector + 11831f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 11841f68f0c4SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 11851f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 11861f68f0c4SNeilBrown mbio->bi_rw = WRITE | do_flush_fua | do_sync; 11871f68f0c4SNeilBrown mbio->bi_private = r1_bio; 11881f68f0c4SNeilBrown 11891da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1190191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 11914e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 119234db0cd6SNeilBrown conf->pending_count++; 1193191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 11944e78064fSNeilBrown } 1195079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1196079fa166SNeilBrown * as it could result in the bio being freed. 1197079fa166SNeilBrown */ 11981f68f0c4SNeilBrown if (sectors_handled < (bio->bi_size >> 9)) { 1199079fa166SNeilBrown r1_bio_write_done(r1_bio); 12001f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 12011f68f0c4SNeilBrown * in bio->bi_phys_segments 12021f68f0c4SNeilBrown */ 12031f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 12041f68f0c4SNeilBrown r1_bio->master_bio = bio; 12051f68f0c4SNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 12061f68f0c4SNeilBrown r1_bio->state = 0; 12071f68f0c4SNeilBrown r1_bio->mddev = mddev; 12081f68f0c4SNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 12091f68f0c4SNeilBrown goto retry_write; 12101f68f0c4SNeilBrown } 12111f68f0c4SNeilBrown 1212079fa166SNeilBrown r1_bio_write_done(r1_bio); 1213079fa166SNeilBrown 1214079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1215079fa166SNeilBrown wake_up(&conf->wait_barrier); 1216079fa166SNeilBrown 1217c3b328acSNeilBrown if (do_sync || !bitmap || !plugged) 1218e3881a68SLars Ellenberg md_wakeup_thread(mddev->thread); 12191da177e4SLinus Torvalds } 12201da177e4SLinus Torvalds 1221fd01b88cSNeilBrown static void status(struct seq_file *seq, struct mddev *mddev) 12221da177e4SLinus Torvalds { 1223e8096360SNeilBrown struct r1conf *conf = mddev->private; 12241da177e4SLinus Torvalds int i; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 122711ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1228ddac7c7eSNeilBrown rcu_read_lock(); 1229ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 12303cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 12311da177e4SLinus Torvalds seq_printf(seq, "%s", 1232ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1233ddac7c7eSNeilBrown } 1234ddac7c7eSNeilBrown rcu_read_unlock(); 12351da177e4SLinus Torvalds seq_printf(seq, "]"); 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds 1239fd01b88cSNeilBrown static void error(struct mddev *mddev, struct md_rdev *rdev) 12401da177e4SLinus Torvalds { 12411da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1242e8096360SNeilBrown struct r1conf *conf = mddev->private; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds /* 12451da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 12461da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 12471da177e4SLinus Torvalds * next level up know. 12481da177e4SLinus Torvalds * else mark the drive as failed 12491da177e4SLinus Torvalds */ 1250b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 12514044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 12521da177e4SLinus Torvalds /* 12531da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 12544044ba58SNeilBrown * normal single drive. 12554044ba58SNeilBrown * However don't try a recovery from this drive as 12564044ba58SNeilBrown * it is very likely to fail. 12571da177e4SLinus Torvalds */ 12585389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 12591da177e4SLinus Torvalds return; 12604044ba58SNeilBrown } 1261de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1262c04be0aaSNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 1263c04be0aaSNeilBrown unsigned long flags; 1264c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 12651da177e4SLinus Torvalds mddev->degraded++; 1266dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1267c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 12681da177e4SLinus Torvalds /* 12691da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 12701da177e4SLinus Torvalds */ 1271dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1272dd00a99eSNeilBrown } else 1273b2d444d7SNeilBrown set_bit(Faulty, &rdev->flags); 1274850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 1275067032bcSJoe Perches printk(KERN_ALERT 1276067032bcSJoe Perches "md/raid1:%s: Disk failure on %s, disabling device.\n" 1277067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 12789dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 12799dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 12801da177e4SLinus Torvalds } 12811da177e4SLinus Torvalds 1282e8096360SNeilBrown static void print_conf(struct r1conf *conf) 12831da177e4SLinus Torvalds { 12841da177e4SLinus Torvalds int i; 12851da177e4SLinus Torvalds 12869dd1e2faSNeilBrown printk(KERN_DEBUG "RAID1 conf printout:\n"); 12871da177e4SLinus Torvalds if (!conf) { 12889dd1e2faSNeilBrown printk(KERN_DEBUG "(!conf)\n"); 12891da177e4SLinus Torvalds return; 12901da177e4SLinus Torvalds } 12919dd1e2faSNeilBrown printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 12921da177e4SLinus Torvalds conf->raid_disks); 12931da177e4SLinus Torvalds 1294ddac7c7eSNeilBrown rcu_read_lock(); 12951da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 12961da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 12973cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1298ddac7c7eSNeilBrown if (rdev) 12999dd1e2faSNeilBrown printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", 1300ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1301ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1302ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 13031da177e4SLinus Torvalds } 1304ddac7c7eSNeilBrown rcu_read_unlock(); 13051da177e4SLinus Torvalds } 13061da177e4SLinus Torvalds 1307e8096360SNeilBrown static void close_sync(struct r1conf *conf) 13081da177e4SLinus Torvalds { 130917999be4SNeilBrown wait_barrier(conf); 131017999be4SNeilBrown allow_barrier(conf); 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 13131da177e4SLinus Torvalds conf->r1buf_pool = NULL; 13141da177e4SLinus Torvalds } 13151da177e4SLinus Torvalds 1316fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 13171da177e4SLinus Torvalds { 13181da177e4SLinus Torvalds int i; 1319e8096360SNeilBrown struct r1conf *conf = mddev->private; 13206b965620SNeilBrown int count = 0; 13216b965620SNeilBrown unsigned long flags; 13221da177e4SLinus Torvalds 13231da177e4SLinus Torvalds /* 13241da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1325ddac7c7eSNeilBrown * and mark them readable. 1326ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 13271da177e4SLinus Torvalds */ 13281da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 13293cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 13308c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 13318c7a2c2bSNeilBrown if (repl 13328c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 13338c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 13348c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 13358c7a2c2bSNeilBrown /* replacement has just become active */ 13368c7a2c2bSNeilBrown if (!rdev || 13378c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 13388c7a2c2bSNeilBrown count++; 13398c7a2c2bSNeilBrown if (rdev) { 13408c7a2c2bSNeilBrown /* Replaced device not technically 13418c7a2c2bSNeilBrown * faulty, but we need to be sure 13428c7a2c2bSNeilBrown * it gets removed and never re-added 13438c7a2c2bSNeilBrown */ 13448c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 13458c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 13468c7a2c2bSNeilBrown rdev->sysfs_state); 13478c7a2c2bSNeilBrown } 13488c7a2c2bSNeilBrown } 1349ddac7c7eSNeilBrown if (rdev 1350ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1351c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 13526b965620SNeilBrown count++; 1353654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 13541da177e4SLinus Torvalds } 13551da177e4SLinus Torvalds } 13566b965620SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 13576b965620SNeilBrown mddev->degraded -= count; 13586b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 13591da177e4SLinus Torvalds 13601da177e4SLinus Torvalds print_conf(conf); 13616b965620SNeilBrown return count; 13621da177e4SLinus Torvalds } 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds 1365fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 13661da177e4SLinus Torvalds { 1367e8096360SNeilBrown struct r1conf *conf = mddev->private; 1368199050eaSNeil Brown int err = -EEXIST; 136941158c7eSNeilBrown int mirror = 0; 13700f6d02d5SNeilBrown struct mirror_info *p; 13716c2fce2eSNeil Brown int first = 0; 137230194636SNeilBrown int last = conf->raid_disks - 1; 13736b740b8dSNeilBrown struct request_queue *q = bdev_get_queue(rdev->bdev); 13741da177e4SLinus Torvalds 13755389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 13765389042fSNeilBrown return -EBUSY; 13775389042fSNeilBrown 13786c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 13796c2fce2eSNeil Brown first = last = rdev->raid_disk; 13806c2fce2eSNeil Brown 13816b740b8dSNeilBrown if (q->merge_bvec_fn) { 13826b740b8dSNeilBrown set_bit(Unmerged, &rdev->flags); 13836b740b8dSNeilBrown mddev->merge_check_needed = 1; 13846b740b8dSNeilBrown } 13856b740b8dSNeilBrown 13867ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 13877ef449d1SNeilBrown p = conf->mirrors+mirror; 13887ef449d1SNeilBrown if (!p->rdev) { 13891da177e4SLinus Torvalds 13908f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 13918f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds p->head_position = 0; 13941da177e4SLinus Torvalds rdev->raid_disk = mirror; 1395199050eaSNeil Brown err = 0; 13966aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 13976aea114aSNeilBrown * if this was recently any drive of the array 13986aea114aSNeilBrown */ 13996aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 140041158c7eSNeilBrown conf->fullsync = 1; 1401d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 14021da177e4SLinus Torvalds break; 14031da177e4SLinus Torvalds } 14047ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 14057ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 14067ef449d1SNeilBrown /* Add this device as a replacement */ 14077ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 14087ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 14097ef449d1SNeilBrown rdev->raid_disk = mirror; 14107ef449d1SNeilBrown err = 0; 14117ef449d1SNeilBrown conf->fullsync = 1; 14127ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 14137ef449d1SNeilBrown break; 14147ef449d1SNeilBrown } 14157ef449d1SNeilBrown } 14166b740b8dSNeilBrown if (err == 0 && test_bit(Unmerged, &rdev->flags)) { 14176b740b8dSNeilBrown /* Some requests might not have seen this new 14186b740b8dSNeilBrown * merge_bvec_fn. We must wait for them to complete 14196b740b8dSNeilBrown * before merging the device fully. 14206b740b8dSNeilBrown * First we make sure any code which has tested 14216b740b8dSNeilBrown * our function has submitted the request, then 14226b740b8dSNeilBrown * we wait for all outstanding requests to complete. 14236b740b8dSNeilBrown */ 14246b740b8dSNeilBrown synchronize_sched(); 14256b740b8dSNeilBrown raise_barrier(conf); 14266b740b8dSNeilBrown lower_barrier(conf); 14276b740b8dSNeilBrown clear_bit(Unmerged, &rdev->flags); 14286b740b8dSNeilBrown } 1429ac5e7113SAndre Noll md_integrity_add_rdev(rdev, mddev); 14301da177e4SLinus Torvalds print_conf(conf); 1431199050eaSNeil Brown return err; 14321da177e4SLinus Torvalds } 14331da177e4SLinus Torvalds 1434b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 14351da177e4SLinus Torvalds { 1436e8096360SNeilBrown struct r1conf *conf = mddev->private; 14371da177e4SLinus Torvalds int err = 0; 1438b8321b68SNeilBrown int number = rdev->raid_disk; 14390f6d02d5SNeilBrown struct mirror_info *p = conf->mirrors+ number; 14401da177e4SLinus Torvalds 1441b014f14cSNeilBrown if (rdev != p->rdev) 1442b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1443b014f14cSNeilBrown 14441da177e4SLinus Torvalds print_conf(conf); 1445b8321b68SNeilBrown if (rdev == p->rdev) { 1446b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 14471da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 14481da177e4SLinus Torvalds err = -EBUSY; 14491da177e4SLinus Torvalds goto abort; 14501da177e4SLinus Torvalds } 1451046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1452dfc70645SNeilBrown * is not possible. 1453dfc70645SNeilBrown */ 1454dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 14555389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1456dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1457dfc70645SNeilBrown err = -EBUSY; 1458dfc70645SNeilBrown goto abort; 1459dfc70645SNeilBrown } 14601da177e4SLinus Torvalds p->rdev = NULL; 1461fbd568a3SPaul E. McKenney synchronize_rcu(); 14621da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 14631da177e4SLinus Torvalds /* lost the race, try later */ 14641da177e4SLinus Torvalds err = -EBUSY; 14651da177e4SLinus Torvalds p->rdev = rdev; 1466ac5e7113SAndre Noll goto abort; 14678c7a2c2bSNeilBrown } else if (conf->mirrors[conf->raid_disks + number].rdev) { 14688c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 14698c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 14708c7a2c2bSNeilBrown * doing this to avoid confusion. 14718c7a2c2bSNeilBrown */ 14728c7a2c2bSNeilBrown struct md_rdev *repl = 14738c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 14748c7a2c2bSNeilBrown raise_barrier(conf); 14758c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 14768c7a2c2bSNeilBrown p->rdev = repl; 14778c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 14788c7a2c2bSNeilBrown lower_barrier(conf); 1479b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 14808c7a2c2bSNeilBrown } else 14818c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1482a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 14831da177e4SLinus Torvalds } 14841da177e4SLinus Torvalds abort: 14851da177e4SLinus Torvalds 14861da177e4SLinus Torvalds print_conf(conf); 14871da177e4SLinus Torvalds return err; 14881da177e4SLinus Torvalds } 14891da177e4SLinus Torvalds 14901da177e4SLinus Torvalds 14916712ecf8SNeilBrown static void end_sync_read(struct bio *bio, int error) 14921da177e4SLinus Torvalds { 14939f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 14941da177e4SLinus Torvalds 14950fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1496ba3ae3beSNamhyung Kim 14971da177e4SLinus Torvalds /* 14981da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 14991da177e4SLinus Torvalds * or re-read if the read failed. 15001da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 15011da177e4SLinus Torvalds */ 150269382e85SNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags)) 15031da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1504d11c171eSNeilBrown 1505d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 15061da177e4SLinus Torvalds reschedule_retry(r1_bio); 15071da177e4SLinus Torvalds } 15081da177e4SLinus Torvalds 15096712ecf8SNeilBrown static void end_sync_write(struct bio *bio, int error) 15101da177e4SLinus Torvalds { 15111da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 15129f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1513fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1514e8096360SNeilBrown struct r1conf *conf = mddev->private; 15151da177e4SLinus Torvalds int mirror=0; 15164367af55SNeilBrown sector_t first_bad; 15174367af55SNeilBrown int bad_sectors; 15181da177e4SLinus Torvalds 1519ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 1520ba3ae3beSNamhyung Kim 15216b1117d5SNeilBrown if (!uptodate) { 152257dab0bdSNeilBrown sector_t sync_blocks = 0; 15236b1117d5SNeilBrown sector_t s = r1_bio->sector; 15246b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 15256b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 15266b1117d5SNeilBrown do { 15275e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 15286b1117d5SNeilBrown &sync_blocks, 1); 15296b1117d5SNeilBrown s += sync_blocks; 15306b1117d5SNeilBrown sectors_to_go -= sync_blocks; 15316b1117d5SNeilBrown } while (sectors_to_go > 0); 1532d8f05d29SNeilBrown set_bit(WriteErrorSeen, 1533d8f05d29SNeilBrown &conf->mirrors[mirror].rdev->flags); 153419d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 153519d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 153619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 153719d67169SNeilBrown mddev->recovery); 1538d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 15394367af55SNeilBrown } else if (is_badblock(conf->mirrors[mirror].rdev, 15404367af55SNeilBrown r1_bio->sector, 15414367af55SNeilBrown r1_bio->sectors, 15423a9f28a5SNeilBrown &first_bad, &bad_sectors) && 15433a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 15443a9f28a5SNeilBrown r1_bio->sector, 15453a9f28a5SNeilBrown r1_bio->sectors, 15463a9f28a5SNeilBrown &first_bad, &bad_sectors) 15473a9f28a5SNeilBrown ) 15484367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1549e3b9703eSNeilBrown 15501da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 15514367af55SNeilBrown int s = r1_bio->sectors; 1552d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1553d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 15544367af55SNeilBrown reschedule_retry(r1_bio); 15554367af55SNeilBrown else { 15561da177e4SLinus Torvalds put_buf(r1_bio); 155773d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 15581da177e4SLinus Torvalds } 15591da177e4SLinus Torvalds } 15604367af55SNeilBrown } 15611da177e4SLinus Torvalds 15623cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1563d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1564d8f05d29SNeilBrown { 1565d8f05d29SNeilBrown if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1566d8f05d29SNeilBrown /* success */ 1567d8f05d29SNeilBrown return 1; 156819d67169SNeilBrown if (rw == WRITE) { 1569d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 157019d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 157119d67169SNeilBrown &rdev->flags)) 157219d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 157319d67169SNeilBrown rdev->mddev->recovery); 157419d67169SNeilBrown } 1575d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1576d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1577d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1578d8f05d29SNeilBrown return 0; 1579d8f05d29SNeilBrown } 1580d8f05d29SNeilBrown 15819f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 15821da177e4SLinus Torvalds { 1583a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 158469382e85SNeilBrown * good data, much like with normal read errors. Only 1585ddac7c7eSNeilBrown * read into the pages we already have so we don't 158669382e85SNeilBrown * need to re-issue the read request. 158769382e85SNeilBrown * We don't need to freeze the array, because being in an 158869382e85SNeilBrown * active sync request, there is no normal IO, and 158969382e85SNeilBrown * no overlapping syncs. 159006f60385SNeilBrown * We don't need to check is_badblock() again as we 159106f60385SNeilBrown * made sure that anything with a bad block in range 159206f60385SNeilBrown * will have bi_end_io clear. 15931da177e4SLinus Torvalds */ 1594fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1595e8096360SNeilBrown struct r1conf *conf = mddev->private; 1596a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 159769382e85SNeilBrown sector_t sect = r1_bio->sector; 159869382e85SNeilBrown int sectors = r1_bio->sectors; 159969382e85SNeilBrown int idx = 0; 160069382e85SNeilBrown 160169382e85SNeilBrown while(sectors) { 160269382e85SNeilBrown int s = sectors; 160369382e85SNeilBrown int d = r1_bio->read_disk; 160469382e85SNeilBrown int success = 0; 16053cb03002SNeilBrown struct md_rdev *rdev; 160678d7f5f7SNeilBrown int start; 160769382e85SNeilBrown 160869382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 160969382e85SNeilBrown s = PAGE_SIZE >> 9; 161069382e85SNeilBrown do { 161169382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1612ddac7c7eSNeilBrown /* No rcu protection needed here devices 1613ddac7c7eSNeilBrown * can only be removed when no resync is 1614ddac7c7eSNeilBrown * active, and resync is currently active 1615ddac7c7eSNeilBrown */ 161669382e85SNeilBrown rdev = conf->mirrors[d].rdev; 16179d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 161869382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1619ccebd4c4SJonathan Brassow READ, false)) { 162069382e85SNeilBrown success = 1; 162169382e85SNeilBrown break; 162269382e85SNeilBrown } 162369382e85SNeilBrown } 162469382e85SNeilBrown d++; 16258f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 162669382e85SNeilBrown d = 0; 162769382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 162869382e85SNeilBrown 162978d7f5f7SNeilBrown if (!success) { 163078d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 16313a9f28a5SNeilBrown int abort = 0; 16323a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 16333a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 16343a9f28a5SNeilBrown * work just disable and interrupt the recovery. 16353a9f28a5SNeilBrown * Don't fail devices as that won't really help. 16363a9f28a5SNeilBrown */ 163778d7f5f7SNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" 163878d7f5f7SNeilBrown " for block %llu\n", 163978d7f5f7SNeilBrown mdname(mddev), 164078d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 164178d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 16428f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 16433a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 16443a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 16453a9f28a5SNeilBrown continue; 16463a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 16473a9f28a5SNeilBrown abort = 1; 16483a9f28a5SNeilBrown } 16493a9f28a5SNeilBrown if (abort) { 1650d890fa2bSNeilBrown conf->recovery_disabled = 1651d890fa2bSNeilBrown mddev->recovery_disabled; 16523a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 165378d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 165478d7f5f7SNeilBrown put_buf(r1_bio); 165578d7f5f7SNeilBrown return 0; 165678d7f5f7SNeilBrown } 16573a9f28a5SNeilBrown /* Try next page */ 16583a9f28a5SNeilBrown sectors -= s; 16593a9f28a5SNeilBrown sect += s; 16603a9f28a5SNeilBrown idx++; 16613a9f28a5SNeilBrown continue; 16623a9f28a5SNeilBrown } 166378d7f5f7SNeilBrown 166478d7f5f7SNeilBrown start = d; 166569382e85SNeilBrown /* write it back and re-read */ 166669382e85SNeilBrown while (d != r1_bio->read_disk) { 166769382e85SNeilBrown if (d == 0) 16688f19ccb2SNeilBrown d = conf->raid_disks * 2; 166969382e85SNeilBrown d--; 167069382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 167169382e85SNeilBrown continue; 167269382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1673d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 167469382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1675d8f05d29SNeilBrown WRITE) == 0) { 167678d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 167778d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 16789d3d8011SNamhyung Kim } 1679097426f6SNeilBrown } 1680097426f6SNeilBrown d = start; 1681097426f6SNeilBrown while (d != r1_bio->read_disk) { 1682097426f6SNeilBrown if (d == 0) 16838f19ccb2SNeilBrown d = conf->raid_disks * 2; 1684097426f6SNeilBrown d--; 1685097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1686097426f6SNeilBrown continue; 1687097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1688d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 168969382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1690d8f05d29SNeilBrown READ) != 0) 16919d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 169269382e85SNeilBrown } 169369382e85SNeilBrown sectors -= s; 169469382e85SNeilBrown sect += s; 169569382e85SNeilBrown idx ++; 169669382e85SNeilBrown } 169778d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 16987ca78d57SNeilBrown set_bit(BIO_UPTODATE, &bio->bi_flags); 1699a68e5870SNeilBrown return 1; 170069382e85SNeilBrown } 1701d11c171eSNeilBrown 17029f2c9d12SNeilBrown static int process_checks(struct r1bio *r1_bio) 1703a68e5870SNeilBrown { 1704a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1705a68e5870SNeilBrown * got the block, then there is no hope left. 1706a68e5870SNeilBrown * If we have, then we want to do a comparison 1707a68e5870SNeilBrown * and skip the write if everything is the same. 1708a68e5870SNeilBrown * If any blocks failed to read, then we need to 1709a68e5870SNeilBrown * attempt an over-write 1710a68e5870SNeilBrown */ 1711fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1712e8096360SNeilBrown struct r1conf *conf = mddev->private; 1713a68e5870SNeilBrown int primary; 1714a68e5870SNeilBrown int i; 1715a68e5870SNeilBrown 17168f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 1717a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 1718a68e5870SNeilBrown test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { 1719a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1720a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1721a68e5870SNeilBrown break; 1722a68e5870SNeilBrown } 1723a68e5870SNeilBrown r1_bio->read_disk = primary; 17248f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1725a68e5870SNeilBrown int j; 1726a68e5870SNeilBrown int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); 1727a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1728a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 172978d7f5f7SNeilBrown int size; 173078d7f5f7SNeilBrown 173178d7f5f7SNeilBrown if (r1_bio->bios[i]->bi_end_io != end_sync_read) 173278d7f5f7SNeilBrown continue; 1733a68e5870SNeilBrown 1734a68e5870SNeilBrown if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { 1735a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1736a68e5870SNeilBrown struct page *p, *s; 1737a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1738a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1739a68e5870SNeilBrown if (memcmp(page_address(p), 1740a68e5870SNeilBrown page_address(s), 1741a68e5870SNeilBrown PAGE_SIZE)) 1742a68e5870SNeilBrown break; 1743a68e5870SNeilBrown } 1744a68e5870SNeilBrown } else 1745a68e5870SNeilBrown j = 0; 1746a68e5870SNeilBrown if (j >= 0) 1747a68e5870SNeilBrown mddev->resync_mismatches += r1_bio->sectors; 1748a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 1749a68e5870SNeilBrown && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { 175078d7f5f7SNeilBrown /* No need to write to this device. */ 1751a68e5870SNeilBrown sbio->bi_end_io = NULL; 1752a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 175378d7f5f7SNeilBrown continue; 175478d7f5f7SNeilBrown } 1755a68e5870SNeilBrown /* fixup the bio for reuse */ 1756a68e5870SNeilBrown sbio->bi_vcnt = vcnt; 1757a68e5870SNeilBrown sbio->bi_size = r1_bio->sectors << 9; 1758a68e5870SNeilBrown sbio->bi_idx = 0; 1759a68e5870SNeilBrown sbio->bi_phys_segments = 0; 1760a68e5870SNeilBrown sbio->bi_flags &= ~(BIO_POOL_MASK - 1); 1761a68e5870SNeilBrown sbio->bi_flags |= 1 << BIO_UPTODATE; 1762a68e5870SNeilBrown sbio->bi_next = NULL; 1763a68e5870SNeilBrown sbio->bi_sector = r1_bio->sector + 1764a68e5870SNeilBrown conf->mirrors[i].rdev->data_offset; 1765a68e5870SNeilBrown sbio->bi_bdev = conf->mirrors[i].rdev->bdev; 1766a68e5870SNeilBrown size = sbio->bi_size; 1767a68e5870SNeilBrown for (j = 0; j < vcnt ; j++) { 1768a68e5870SNeilBrown struct bio_vec *bi; 1769a68e5870SNeilBrown bi = &sbio->bi_io_vec[j]; 1770a68e5870SNeilBrown bi->bv_offset = 0; 1771a68e5870SNeilBrown if (size > PAGE_SIZE) 1772a68e5870SNeilBrown bi->bv_len = PAGE_SIZE; 1773a68e5870SNeilBrown else 1774a68e5870SNeilBrown bi->bv_len = size; 1775a68e5870SNeilBrown size -= PAGE_SIZE; 1776a68e5870SNeilBrown memcpy(page_address(bi->bv_page), 1777a68e5870SNeilBrown page_address(pbio->bi_io_vec[j].bv_page), 1778a68e5870SNeilBrown PAGE_SIZE); 1779a68e5870SNeilBrown } 1780a68e5870SNeilBrown } 1781a68e5870SNeilBrown return 0; 1782a68e5870SNeilBrown } 1783a68e5870SNeilBrown 17849f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 1785a68e5870SNeilBrown { 1786e8096360SNeilBrown struct r1conf *conf = mddev->private; 1787a68e5870SNeilBrown int i; 17888f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 1789a68e5870SNeilBrown struct bio *bio, *wbio; 1790a68e5870SNeilBrown 1791a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 1792a68e5870SNeilBrown 1793a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 1794a68e5870SNeilBrown /* ouch - failed to read all of that. */ 1795a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 1796a68e5870SNeilBrown return; 17977ca78d57SNeilBrown 17987ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 17997ca78d57SNeilBrown if (process_checks(r1_bio) < 0) 18007ca78d57SNeilBrown return; 1801d11c171eSNeilBrown /* 1802d11c171eSNeilBrown * schedule writes 1803d11c171eSNeilBrown */ 18041da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 18051da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 18061da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 18073e198f78SNeilBrown if (wbio->bi_end_io == NULL || 18083e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 18093e198f78SNeilBrown (i == r1_bio->read_disk || 18103e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 18111da177e4SLinus Torvalds continue; 18121da177e4SLinus Torvalds 18133e198f78SNeilBrown wbio->bi_rw = WRITE; 18143e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 18151da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 18161da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 1817191ea9b2SNeilBrown 18181da177e4SLinus Torvalds generic_make_request(wbio); 18191da177e4SLinus Torvalds } 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 1822191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 18231da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 1); 18241da177e4SLinus Torvalds put_buf(r1_bio); 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds } 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds /* 18291da177e4SLinus Torvalds * This is a kernel thread which: 18301da177e4SLinus Torvalds * 18311da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 18321da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 1833d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 18341da177e4SLinus Torvalds */ 18351da177e4SLinus Torvalds 1836e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 1837867868fbSNeilBrown sector_t sect, int sectors) 1838867868fbSNeilBrown { 1839fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 1840867868fbSNeilBrown while(sectors) { 1841867868fbSNeilBrown int s = sectors; 1842867868fbSNeilBrown int d = read_disk; 1843867868fbSNeilBrown int success = 0; 1844867868fbSNeilBrown int start; 18453cb03002SNeilBrown struct md_rdev *rdev; 1846867868fbSNeilBrown 1847867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 1848867868fbSNeilBrown s = PAGE_SIZE >> 9; 1849867868fbSNeilBrown 1850867868fbSNeilBrown do { 1851867868fbSNeilBrown /* Note: no rcu protection needed here 1852867868fbSNeilBrown * as this is synchronous in the raid1d thread 1853867868fbSNeilBrown * which is the thread that might remove 1854867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 1855867868fbSNeilBrown */ 1856d2eb35acSNeilBrown sector_t first_bad; 1857d2eb35acSNeilBrown int bad_sectors; 1858d2eb35acSNeilBrown 1859867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1860867868fbSNeilBrown if (rdev && 1861867868fbSNeilBrown test_bit(In_sync, &rdev->flags) && 1862d2eb35acSNeilBrown is_badblock(rdev, sect, s, 1863d2eb35acSNeilBrown &first_bad, &bad_sectors) == 0 && 1864ccebd4c4SJonathan Brassow sync_page_io(rdev, sect, s<<9, 1865ccebd4c4SJonathan Brassow conf->tmppage, READ, false)) 1866867868fbSNeilBrown success = 1; 1867867868fbSNeilBrown else { 1868867868fbSNeilBrown d++; 18698f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 1870867868fbSNeilBrown d = 0; 1871867868fbSNeilBrown } 1872867868fbSNeilBrown } while (!success && d != read_disk); 1873867868fbSNeilBrown 1874867868fbSNeilBrown if (!success) { 1875d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 18763cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 1877d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 1878d8f05d29SNeilBrown md_error(mddev, rdev); 1879867868fbSNeilBrown break; 1880867868fbSNeilBrown } 1881867868fbSNeilBrown /* write it back and re-read */ 1882867868fbSNeilBrown start = d; 1883867868fbSNeilBrown while (d != read_disk) { 1884867868fbSNeilBrown if (d==0) 18858f19ccb2SNeilBrown d = conf->raid_disks * 2; 1886867868fbSNeilBrown d--; 1887867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1888867868fbSNeilBrown if (rdev && 1889d8f05d29SNeilBrown test_bit(In_sync, &rdev->flags)) 1890d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 1891d8f05d29SNeilBrown conf->tmppage, WRITE); 1892867868fbSNeilBrown } 1893867868fbSNeilBrown d = start; 1894867868fbSNeilBrown while (d != read_disk) { 1895867868fbSNeilBrown char b[BDEVNAME_SIZE]; 1896867868fbSNeilBrown if (d==0) 18978f19ccb2SNeilBrown d = conf->raid_disks * 2; 1898867868fbSNeilBrown d--; 1899867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1900867868fbSNeilBrown if (rdev && 1901867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1902d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 1903d8f05d29SNeilBrown conf->tmppage, READ)) { 1904867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 1905867868fbSNeilBrown printk(KERN_INFO 19069dd1e2faSNeilBrown "md/raid1:%s: read error corrected " 1907867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 1908867868fbSNeilBrown mdname(mddev), s, 1909969b755aSRandy Dunlap (unsigned long long)(sect + 1910969b755aSRandy Dunlap rdev->data_offset), 1911867868fbSNeilBrown bdevname(rdev->bdev, b)); 1912867868fbSNeilBrown } 1913867868fbSNeilBrown } 1914867868fbSNeilBrown } 1915867868fbSNeilBrown sectors -= s; 1916867868fbSNeilBrown sect += s; 1917867868fbSNeilBrown } 1918867868fbSNeilBrown } 1919867868fbSNeilBrown 1920cd5ff9a1SNeilBrown static void bi_complete(struct bio *bio, int error) 1921cd5ff9a1SNeilBrown { 1922cd5ff9a1SNeilBrown complete((struct completion *)bio->bi_private); 1923cd5ff9a1SNeilBrown } 1924cd5ff9a1SNeilBrown 1925cd5ff9a1SNeilBrown static int submit_bio_wait(int rw, struct bio *bio) 1926cd5ff9a1SNeilBrown { 1927cd5ff9a1SNeilBrown struct completion event; 1928cd5ff9a1SNeilBrown rw |= REQ_SYNC; 1929cd5ff9a1SNeilBrown 1930cd5ff9a1SNeilBrown init_completion(&event); 1931cd5ff9a1SNeilBrown bio->bi_private = &event; 1932cd5ff9a1SNeilBrown bio->bi_end_io = bi_complete; 1933cd5ff9a1SNeilBrown submit_bio(rw, bio); 1934cd5ff9a1SNeilBrown wait_for_completion(&event); 1935cd5ff9a1SNeilBrown 1936cd5ff9a1SNeilBrown return test_bit(BIO_UPTODATE, &bio->bi_flags); 1937cd5ff9a1SNeilBrown } 1938cd5ff9a1SNeilBrown 19399f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 1940cd5ff9a1SNeilBrown { 1941fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1942e8096360SNeilBrown struct r1conf *conf = mddev->private; 19433cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 1944cd5ff9a1SNeilBrown int vcnt, idx; 1945cd5ff9a1SNeilBrown struct bio_vec *vec; 1946cd5ff9a1SNeilBrown 1947cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 1948cd5ff9a1SNeilBrown * we just recently had a write error. 1949cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 1950cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 1951cd5ff9a1SNeilBrown * a bad block. 1952cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 1953cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 1954cd5ff9a1SNeilBrown * 1955cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 1956cd5ff9a1SNeilBrown */ 1957cd5ff9a1SNeilBrown 1958cd5ff9a1SNeilBrown int block_sectors; 1959cd5ff9a1SNeilBrown sector_t sector; 1960cd5ff9a1SNeilBrown int sectors; 1961cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 1962cd5ff9a1SNeilBrown int ok = 1; 1963cd5ff9a1SNeilBrown 1964cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 1965cd5ff9a1SNeilBrown return 0; 1966cd5ff9a1SNeilBrown 1967cd5ff9a1SNeilBrown block_sectors = 1 << rdev->badblocks.shift; 1968cd5ff9a1SNeilBrown sector = r1_bio->sector; 1969cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 1970cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 1971cd5ff9a1SNeilBrown - sector; 1972cd5ff9a1SNeilBrown 1973cd5ff9a1SNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 1974cd5ff9a1SNeilBrown vcnt = r1_bio->behind_page_count; 1975cd5ff9a1SNeilBrown vec = r1_bio->behind_bvecs; 1976cd5ff9a1SNeilBrown idx = 0; 1977cd5ff9a1SNeilBrown while (vec[idx].bv_page == NULL) 1978cd5ff9a1SNeilBrown idx++; 1979cd5ff9a1SNeilBrown } else { 1980cd5ff9a1SNeilBrown vcnt = r1_bio->master_bio->bi_vcnt; 1981cd5ff9a1SNeilBrown vec = r1_bio->master_bio->bi_io_vec; 1982cd5ff9a1SNeilBrown idx = r1_bio->master_bio->bi_idx; 1983cd5ff9a1SNeilBrown } 1984cd5ff9a1SNeilBrown while (sect_to_write) { 1985cd5ff9a1SNeilBrown struct bio *wbio; 1986cd5ff9a1SNeilBrown if (sectors > sect_to_write) 1987cd5ff9a1SNeilBrown sectors = sect_to_write; 1988cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 1989cd5ff9a1SNeilBrown 1990cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 1991cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 1992cd5ff9a1SNeilBrown wbio->bi_sector = r1_bio->sector; 1993cd5ff9a1SNeilBrown wbio->bi_rw = WRITE; 1994cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 1995cd5ff9a1SNeilBrown wbio->bi_size = r1_bio->sectors << 9; 1996cd5ff9a1SNeilBrown wbio->bi_idx = idx; 1997cd5ff9a1SNeilBrown 1998cd5ff9a1SNeilBrown md_trim_bio(wbio, sector - r1_bio->sector, sectors); 1999cd5ff9a1SNeilBrown wbio->bi_sector += rdev->data_offset; 2000cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 2001cd5ff9a1SNeilBrown if (submit_bio_wait(WRITE, wbio) == 0) 2002cd5ff9a1SNeilBrown /* failure! */ 2003cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2004cd5ff9a1SNeilBrown sectors, 0) 2005cd5ff9a1SNeilBrown && ok; 2006cd5ff9a1SNeilBrown 2007cd5ff9a1SNeilBrown bio_put(wbio); 2008cd5ff9a1SNeilBrown sect_to_write -= sectors; 2009cd5ff9a1SNeilBrown sector += sectors; 2010cd5ff9a1SNeilBrown sectors = block_sectors; 2011cd5ff9a1SNeilBrown } 2012cd5ff9a1SNeilBrown return ok; 2013cd5ff9a1SNeilBrown } 2014cd5ff9a1SNeilBrown 2015e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 201662096bceSNeilBrown { 201762096bceSNeilBrown int m; 201862096bceSNeilBrown int s = r1_bio->sectors; 20198f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 20203cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 202162096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 202262096bceSNeilBrown if (bio->bi_end_io == NULL) 202362096bceSNeilBrown continue; 202462096bceSNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags) && 202562096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 202662096bceSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s); 202762096bceSNeilBrown } 202862096bceSNeilBrown if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 202962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 203062096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 203162096bceSNeilBrown md_error(conf->mddev, rdev); 203262096bceSNeilBrown } 203362096bceSNeilBrown } 203462096bceSNeilBrown put_buf(r1_bio); 203562096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 203662096bceSNeilBrown } 203762096bceSNeilBrown 2038e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 203962096bceSNeilBrown { 204062096bceSNeilBrown int m; 20418f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 204262096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 20433cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 204462096bceSNeilBrown rdev_clear_badblocks(rdev, 204562096bceSNeilBrown r1_bio->sector, 204662096bceSNeilBrown r1_bio->sectors); 204762096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 204862096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 204962096bceSNeilBrown /* This drive got a write error. We need to 205062096bceSNeilBrown * narrow down and record precise write 205162096bceSNeilBrown * errors. 205262096bceSNeilBrown */ 205362096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 205462096bceSNeilBrown md_error(conf->mddev, 205562096bceSNeilBrown conf->mirrors[m].rdev); 205662096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 205762096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 205862096bceSNeilBrown } 205962096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 206062096bceSNeilBrown conf->mddev); 206162096bceSNeilBrown } 206262096bceSNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 206362096bceSNeilBrown close_write(r1_bio); 206462096bceSNeilBrown raid_end_bio_io(r1_bio); 206562096bceSNeilBrown } 206662096bceSNeilBrown 2067e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 206862096bceSNeilBrown { 206962096bceSNeilBrown int disk; 207062096bceSNeilBrown int max_sectors; 2071fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 207262096bceSNeilBrown struct bio *bio; 207362096bceSNeilBrown char b[BDEVNAME_SIZE]; 20743cb03002SNeilBrown struct md_rdev *rdev; 207562096bceSNeilBrown 207662096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 207762096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 207862096bceSNeilBrown * the block and we can fix it. 207962096bceSNeilBrown * We freeze all other IO, and try reading the block from 208062096bceSNeilBrown * other devices. When we find one, we re-write 208162096bceSNeilBrown * and check it that fixes the read error. 208262096bceSNeilBrown * This is all done synchronously while the array is 208362096bceSNeilBrown * frozen 208462096bceSNeilBrown */ 208562096bceSNeilBrown if (mddev->ro == 0) { 208662096bceSNeilBrown freeze_array(conf); 208762096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 208862096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 208962096bceSNeilBrown unfreeze_array(conf); 209062096bceSNeilBrown } else 209162096bceSNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 209262096bceSNeilBrown 209362096bceSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 209462096bceSNeilBrown bdevname(bio->bi_bdev, b); 209562096bceSNeilBrown read_more: 209662096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 209762096bceSNeilBrown if (disk == -1) { 209862096bceSNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" 209962096bceSNeilBrown " read error for block %llu\n", 210062096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 210162096bceSNeilBrown raid_end_bio_io(r1_bio); 210262096bceSNeilBrown } else { 210362096bceSNeilBrown const unsigned long do_sync 210462096bceSNeilBrown = r1_bio->master_bio->bi_rw & REQ_SYNC; 210562096bceSNeilBrown if (bio) { 210662096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = 210762096bceSNeilBrown mddev->ro ? IO_BLOCKED : NULL; 210862096bceSNeilBrown bio_put(bio); 210962096bceSNeilBrown } 211062096bceSNeilBrown r1_bio->read_disk = disk; 211162096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 211262096bceSNeilBrown md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); 211362096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 211462096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 211562096bceSNeilBrown printk_ratelimited(KERN_ERR 211662096bceSNeilBrown "md/raid1:%s: redirecting sector %llu" 211762096bceSNeilBrown " to other mirror: %s\n", 211862096bceSNeilBrown mdname(mddev), 211962096bceSNeilBrown (unsigned long long)r1_bio->sector, 212062096bceSNeilBrown bdevname(rdev->bdev, b)); 212162096bceSNeilBrown bio->bi_sector = r1_bio->sector + rdev->data_offset; 212262096bceSNeilBrown bio->bi_bdev = rdev->bdev; 212362096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 212462096bceSNeilBrown bio->bi_rw = READ | do_sync; 212562096bceSNeilBrown bio->bi_private = r1_bio; 212662096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 212762096bceSNeilBrown /* Drat - have to split this up more */ 212862096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 212962096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 213062096bceSNeilBrown - mbio->bi_sector); 213162096bceSNeilBrown r1_bio->sectors = max_sectors; 213262096bceSNeilBrown spin_lock_irq(&conf->device_lock); 213362096bceSNeilBrown if (mbio->bi_phys_segments == 0) 213462096bceSNeilBrown mbio->bi_phys_segments = 2; 213562096bceSNeilBrown else 213662096bceSNeilBrown mbio->bi_phys_segments++; 213762096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 213862096bceSNeilBrown generic_make_request(bio); 213962096bceSNeilBrown bio = NULL; 214062096bceSNeilBrown 214162096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 214262096bceSNeilBrown 214362096bceSNeilBrown r1_bio->master_bio = mbio; 214462096bceSNeilBrown r1_bio->sectors = (mbio->bi_size >> 9) 214562096bceSNeilBrown - sectors_handled; 214662096bceSNeilBrown r1_bio->state = 0; 214762096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 214862096bceSNeilBrown r1_bio->mddev = mddev; 214962096bceSNeilBrown r1_bio->sector = mbio->bi_sector + sectors_handled; 215062096bceSNeilBrown 215162096bceSNeilBrown goto read_more; 215262096bceSNeilBrown } else 215362096bceSNeilBrown generic_make_request(bio); 215462096bceSNeilBrown } 215562096bceSNeilBrown } 215662096bceSNeilBrown 2157fd01b88cSNeilBrown static void raid1d(struct mddev *mddev) 21581da177e4SLinus Torvalds { 21599f2c9d12SNeilBrown struct r1bio *r1_bio; 21601da177e4SLinus Torvalds unsigned long flags; 2161e8096360SNeilBrown struct r1conf *conf = mddev->private; 21621da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2163e1dfa0a2SNeilBrown struct blk_plug plug; 21641da177e4SLinus Torvalds 21651da177e4SLinus Torvalds md_check_recovery(mddev); 21661da177e4SLinus Torvalds 2167e1dfa0a2SNeilBrown blk_start_plug(&plug); 21681da177e4SLinus Torvalds for (;;) { 2169a35e63efSNeilBrown 2170c3b328acSNeilBrown if (atomic_read(&mddev->plug_cnt) == 0) 21717eaceaccSJens Axboe flush_pending_writes(conf); 2172a35e63efSNeilBrown 21731da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2174a35e63efSNeilBrown if (list_empty(head)) { 2175191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 21761da177e4SLinus Torvalds break; 2177a35e63efSNeilBrown } 21789f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 21791da177e4SLinus Torvalds list_del(head->prev); 2180ddaf22abSNeilBrown conf->nr_queued--; 21811da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 21821da177e4SLinus Torvalds 21831da177e4SLinus Torvalds mddev = r1_bio->mddev; 2184070ec55dSNeilBrown conf = mddev->private; 21854367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2186d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 218762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 218862096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 218962096bceSNeilBrown else 21901da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2191cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 219262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 219362096bceSNeilBrown handle_write_finished(conf, r1_bio); 219462096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 219562096bceSNeilBrown handle_read_error(conf, r1_bio); 2196d2eb35acSNeilBrown else 2197d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2198d2eb35acSNeilBrown * context 2199d2eb35acSNeilBrown */ 2200d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 220162096bceSNeilBrown 22021d9d5241SNeilBrown cond_resched(); 2203de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2204de393cdeSNeilBrown md_check_recovery(mddev); 22051da177e4SLinus Torvalds } 2206e1dfa0a2SNeilBrown blk_finish_plug(&plug); 22071da177e4SLinus Torvalds } 22081da177e4SLinus Torvalds 22091da177e4SLinus Torvalds 2210e8096360SNeilBrown static int init_resync(struct r1conf *conf) 22111da177e4SLinus Torvalds { 22121da177e4SLinus Torvalds int buffs; 22131da177e4SLinus Torvalds 22141da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 22159e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 22161da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 22171da177e4SLinus Torvalds conf->poolinfo); 22181da177e4SLinus Torvalds if (!conf->r1buf_pool) 22191da177e4SLinus Torvalds return -ENOMEM; 22201da177e4SLinus Torvalds conf->next_resync = 0; 22211da177e4SLinus Torvalds return 0; 22221da177e4SLinus Torvalds } 22231da177e4SLinus Torvalds 22241da177e4SLinus Torvalds /* 22251da177e4SLinus Torvalds * perform a "sync" on one "block" 22261da177e4SLinus Torvalds * 22271da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 22281da177e4SLinus Torvalds * requests - conflict with active sync requests. 22291da177e4SLinus Torvalds * 22301da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 22311da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 22321da177e4SLinus Torvalds */ 22331da177e4SLinus Torvalds 2234fd01b88cSNeilBrown static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) 22351da177e4SLinus Torvalds { 2236e8096360SNeilBrown struct r1conf *conf = mddev->private; 22379f2c9d12SNeilBrown struct r1bio *r1_bio; 22381da177e4SLinus Torvalds struct bio *bio; 22391da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 22403e198f78SNeilBrown int disk = -1; 22411da177e4SLinus Torvalds int i; 22423e198f78SNeilBrown int wonly = -1; 22433e198f78SNeilBrown int write_targets = 0, read_targets = 0; 224457dab0bdSNeilBrown sector_t sync_blocks; 2245e3b9703eSNeilBrown int still_degraded = 0; 224606f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 224706f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 22481da177e4SLinus Torvalds 22491da177e4SLinus Torvalds if (!conf->r1buf_pool) 22501da177e4SLinus Torvalds if (init_resync(conf)) 225157afd89fSNeilBrown return 0; 22521da177e4SLinus Torvalds 225358c0fed4SAndre Noll max_sector = mddev->dev_sectors; 22541da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2255191ea9b2SNeilBrown /* If we aborted, we need to abort the 2256191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2257191ea9b2SNeilBrown * only be one in raid1 resync. 2258191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2259191ea9b2SNeilBrown */ 22606a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 22616a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2262191ea9b2SNeilBrown &sync_blocks, 1); 22636a806c51SNeilBrown else /* completed sync */ 2264191ea9b2SNeilBrown conf->fullsync = 0; 22656a806c51SNeilBrown 22666a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 22671da177e4SLinus Torvalds close_sync(conf); 22681da177e4SLinus Torvalds return 0; 22691da177e4SLinus Torvalds } 22701da177e4SLinus Torvalds 227107d84d10SNeilBrown if (mddev->bitmap == NULL && 227207d84d10SNeilBrown mddev->recovery_cp == MaxSector && 22736394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 227407d84d10SNeilBrown conf->fullsync == 0) { 227507d84d10SNeilBrown *skipped = 1; 227607d84d10SNeilBrown return max_sector - sector_nr; 227707d84d10SNeilBrown } 22786394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 22796394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 22806394cca5SNeilBrown */ 2281e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2282e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2283191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2284191ea9b2SNeilBrown *skipped = 1; 2285191ea9b2SNeilBrown return sync_blocks; 2286191ea9b2SNeilBrown } 22871da177e4SLinus Torvalds /* 228817999be4SNeilBrown * If there is non-resync activity waiting for a turn, 228917999be4SNeilBrown * and resync is going fast enough, 229017999be4SNeilBrown * then let it though before starting on this new sync request. 22911da177e4SLinus Torvalds */ 229217999be4SNeilBrown if (!go_faster && conf->nr_waiting) 22931da177e4SLinus Torvalds msleep_interruptible(1000); 229417999be4SNeilBrown 2295b47490c9SNeilBrown bitmap_cond_end_sync(mddev->bitmap, sector_nr); 22961c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 229717999be4SNeilBrown raise_barrier(conf); 229817999be4SNeilBrown 229917999be4SNeilBrown conf->next_resync = sector_nr; 23001da177e4SLinus Torvalds 23013e198f78SNeilBrown rcu_read_lock(); 23023e198f78SNeilBrown /* 23033e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 23043e198f78SNeilBrown * we might want to read from a different device. So we 23053e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 23063e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 23073e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 23083e198f78SNeilBrown * is OK. 23093e198f78SNeilBrown */ 23101da177e4SLinus Torvalds 23111da177e4SLinus Torvalds r1_bio->mddev = mddev; 23121da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2313191ea9b2SNeilBrown r1_bio->state = 0; 23141da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 23151da177e4SLinus Torvalds 23168f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 23173cb03002SNeilBrown struct md_rdev *rdev; 23181da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23191da177e4SLinus Torvalds 23201da177e4SLinus Torvalds /* take from bio_init */ 23211da177e4SLinus Torvalds bio->bi_next = NULL; 2322db8d9d35SNeilBrown bio->bi_flags &= ~(BIO_POOL_MASK-1); 23231da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 2324802ba064SNeilBrown bio->bi_rw = READ; 23251da177e4SLinus Torvalds bio->bi_vcnt = 0; 23261da177e4SLinus Torvalds bio->bi_idx = 0; 23271da177e4SLinus Torvalds bio->bi_phys_segments = 0; 23281da177e4SLinus Torvalds bio->bi_size = 0; 23291da177e4SLinus Torvalds bio->bi_end_io = NULL; 23301da177e4SLinus Torvalds bio->bi_private = NULL; 23311da177e4SLinus Torvalds 23323e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 23333e198f78SNeilBrown if (rdev == NULL || 23343e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 23358f19ccb2SNeilBrown if (i < conf->raid_disks) 2336e3b9703eSNeilBrown still_degraded = 1; 23373e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 23381da177e4SLinus Torvalds bio->bi_rw = WRITE; 23391da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 23401da177e4SLinus Torvalds write_targets ++; 23413e198f78SNeilBrown } else { 23423e198f78SNeilBrown /* may need to read from here */ 234306f60385SNeilBrown sector_t first_bad = MaxSector; 234406f60385SNeilBrown int bad_sectors; 234506f60385SNeilBrown 234606f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 234706f60385SNeilBrown &first_bad, &bad_sectors)) { 234806f60385SNeilBrown if (first_bad > sector_nr) 234906f60385SNeilBrown good_sectors = first_bad - sector_nr; 235006f60385SNeilBrown else { 235106f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 235206f60385SNeilBrown if (min_bad == 0 || 235306f60385SNeilBrown min_bad > bad_sectors) 235406f60385SNeilBrown min_bad = bad_sectors; 235506f60385SNeilBrown } 235606f60385SNeilBrown } 235706f60385SNeilBrown if (sector_nr < first_bad) { 23583e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 23593e198f78SNeilBrown if (wonly < 0) 23603e198f78SNeilBrown wonly = i; 23613e198f78SNeilBrown } else { 23623e198f78SNeilBrown if (disk < 0) 23633e198f78SNeilBrown disk = i; 23643e198f78SNeilBrown } 236506f60385SNeilBrown bio->bi_rw = READ; 236606f60385SNeilBrown bio->bi_end_io = end_sync_read; 23673e198f78SNeilBrown read_targets++; 23683e198f78SNeilBrown } 236906f60385SNeilBrown } 237006f60385SNeilBrown if (bio->bi_end_io) { 23713e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 23723e198f78SNeilBrown bio->bi_sector = sector_nr + rdev->data_offset; 23733e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 23741da177e4SLinus Torvalds bio->bi_private = r1_bio; 23751da177e4SLinus Torvalds } 237606f60385SNeilBrown } 23773e198f78SNeilBrown rcu_read_unlock(); 23783e198f78SNeilBrown if (disk < 0) 23793e198f78SNeilBrown disk = wonly; 23803e198f78SNeilBrown r1_bio->read_disk = disk; 2381191ea9b2SNeilBrown 238206f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 238306f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 238406f60385SNeilBrown * need to mark them bad on all write targets 238506f60385SNeilBrown */ 238606f60385SNeilBrown int ok = 1; 23878f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 238806f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 23893cb03002SNeilBrown struct md_rdev *rdev = 239006f60385SNeilBrown rcu_dereference(conf->mirrors[i].rdev); 239106f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 239206f60385SNeilBrown min_bad, 0 239306f60385SNeilBrown ) && ok; 239406f60385SNeilBrown } 239506f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 239606f60385SNeilBrown *skipped = 1; 239706f60385SNeilBrown put_buf(r1_bio); 239806f60385SNeilBrown 239906f60385SNeilBrown if (!ok) { 240006f60385SNeilBrown /* Cannot record the badblocks, so need to 240106f60385SNeilBrown * abort the resync. 240206f60385SNeilBrown * If there are multiple read targets, could just 240306f60385SNeilBrown * fail the really bad ones ??? 240406f60385SNeilBrown */ 240506f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 240606f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 240706f60385SNeilBrown return 0; 240806f60385SNeilBrown } else 240906f60385SNeilBrown return min_bad; 241006f60385SNeilBrown 241106f60385SNeilBrown } 241206f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 241306f60385SNeilBrown /* only resync enough to reach the next bad->good 241406f60385SNeilBrown * transition */ 241506f60385SNeilBrown good_sectors = min_bad; 241606f60385SNeilBrown } 241706f60385SNeilBrown 24183e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 24193e198f78SNeilBrown /* extra read targets are also write targets */ 24203e198f78SNeilBrown write_targets += read_targets-1; 24213e198f78SNeilBrown 24223e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 24231da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 24241da177e4SLinus Torvalds * drives must be failed - so we are finished 24251da177e4SLinus Torvalds */ 242657afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 242757afd89fSNeilBrown *skipped = 1; 24281da177e4SLinus Torvalds put_buf(r1_bio); 24291da177e4SLinus Torvalds return rv; 24301da177e4SLinus Torvalds } 24311da177e4SLinus Torvalds 2432c6207277SNeilBrown if (max_sector > mddev->resync_max) 2433c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 243406f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 243506f60385SNeilBrown max_sector = sector_nr + good_sectors; 24361da177e4SLinus Torvalds nr_sectors = 0; 2437289e99e8SNeilBrown sync_blocks = 0; 24381da177e4SLinus Torvalds do { 24391da177e4SLinus Torvalds struct page *page; 24401da177e4SLinus Torvalds int len = PAGE_SIZE; 24411da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 24421da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 24431da177e4SLinus Torvalds if (len == 0) 24441da177e4SLinus Torvalds break; 2445ab7a30c7SNeilBrown if (sync_blocks == 0) { 24466a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2447e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2448e5de485fSNeilBrown !conf->fullsync && 2449e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2450191ea9b2SNeilBrown break; 24519e77c485SEric Sesterhenn BUG_ON(sync_blocks < (PAGE_SIZE>>9)); 24527571ae88SNeilBrown if ((len >> 9) > sync_blocks) 24536a806c51SNeilBrown len = sync_blocks<<9; 2454ab7a30c7SNeilBrown } 2455191ea9b2SNeilBrown 24568f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 24571da177e4SLinus Torvalds bio = r1_bio->bios[i]; 24581da177e4SLinus Torvalds if (bio->bi_end_io) { 2459d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 24601da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 24611da177e4SLinus Torvalds /* stop here */ 2462d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 24631da177e4SLinus Torvalds while (i > 0) { 24641da177e4SLinus Torvalds i--; 24651da177e4SLinus Torvalds bio = r1_bio->bios[i]; 24666a806c51SNeilBrown if (bio->bi_end_io==NULL) 24676a806c51SNeilBrown continue; 24681da177e4SLinus Torvalds /* remove last page from this bio */ 24691da177e4SLinus Torvalds bio->bi_vcnt--; 24701da177e4SLinus Torvalds bio->bi_size -= len; 24711da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 24721da177e4SLinus Torvalds } 24731da177e4SLinus Torvalds goto bio_full; 24741da177e4SLinus Torvalds } 24751da177e4SLinus Torvalds } 24761da177e4SLinus Torvalds } 24771da177e4SLinus Torvalds nr_sectors += len>>9; 24781da177e4SLinus Torvalds sector_nr += len>>9; 2479191ea9b2SNeilBrown sync_blocks -= (len>>9); 24801da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 24811da177e4SLinus Torvalds bio_full: 24821da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 24831da177e4SLinus Torvalds 2484d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2485d11c171eSNeilBrown * compare 2486d11c171eSNeilBrown */ 2487d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2488d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 24898f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2490d11c171eSNeilBrown bio = r1_bio->bios[i]; 2491d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 2492ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 24931da177e4SLinus Torvalds generic_make_request(bio); 2494d11c171eSNeilBrown } 2495d11c171eSNeilBrown } 2496d11c171eSNeilBrown } else { 2497d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2498d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2499ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2500d11c171eSNeilBrown generic_make_request(bio); 2501d11c171eSNeilBrown 2502d11c171eSNeilBrown } 25031da177e4SLinus Torvalds return nr_sectors; 25041da177e4SLinus Torvalds } 25051da177e4SLinus Torvalds 2506fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 250780c3a6ceSDan Williams { 250880c3a6ceSDan Williams if (sectors) 250980c3a6ceSDan Williams return sectors; 251080c3a6ceSDan Williams 251180c3a6ceSDan Williams return mddev->dev_sectors; 251280c3a6ceSDan Williams } 251380c3a6ceSDan Williams 2514e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 25151da177e4SLinus Torvalds { 2516e8096360SNeilBrown struct r1conf *conf; 2517709ae487SNeilBrown int i; 25180f6d02d5SNeilBrown struct mirror_info *disk; 25193cb03002SNeilBrown struct md_rdev *rdev; 2520709ae487SNeilBrown int err = -ENOMEM; 25211da177e4SLinus Torvalds 2522e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 25231da177e4SLinus Torvalds if (!conf) 2524709ae487SNeilBrown goto abort; 25251da177e4SLinus Torvalds 25268f19ccb2SNeilBrown conf->mirrors = kzalloc(sizeof(struct mirror_info) 25278f19ccb2SNeilBrown * mddev->raid_disks * 2, 25281da177e4SLinus Torvalds GFP_KERNEL); 25291da177e4SLinus Torvalds if (!conf->mirrors) 2530709ae487SNeilBrown goto abort; 25311da177e4SLinus Torvalds 2532ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2533ddaf22abSNeilBrown if (!conf->tmppage) 2534709ae487SNeilBrown goto abort; 2535ddaf22abSNeilBrown 2536709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 25371da177e4SLinus Torvalds if (!conf->poolinfo) 2538709ae487SNeilBrown goto abort; 25398f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 25401da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 25411da177e4SLinus Torvalds r1bio_pool_free, 25421da177e4SLinus Torvalds conf->poolinfo); 25431da177e4SLinus Torvalds if (!conf->r1bio_pool) 2544709ae487SNeilBrown goto abort; 2545709ae487SNeilBrown 2546ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 25471da177e4SLinus Torvalds 2548c19d5798SNeilBrown err = -EINVAL; 2549e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2550dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2551709ae487SNeilBrown int disk_idx = rdev->raid_disk; 25521da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 25531da177e4SLinus Torvalds || disk_idx < 0) 25541da177e4SLinus Torvalds continue; 2555c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 2556c19d5798SNeilBrown disk = conf->mirrors + conf->raid_disks + disk_idx; 2557c19d5798SNeilBrown else 25581da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 25591da177e4SLinus Torvalds 2560c19d5798SNeilBrown if (disk->rdev) 2561c19d5798SNeilBrown goto abort; 25621da177e4SLinus Torvalds disk->rdev = rdev; 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds disk->head_position = 0; 25651da177e4SLinus Torvalds } 25661da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 25671da177e4SLinus Torvalds conf->mddev = mddev; 25681da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 25691da177e4SLinus Torvalds 25701da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 257117999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 25721da177e4SLinus Torvalds 2573191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 257434db0cd6SNeilBrown conf->pending_count = 0; 2575d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2576191ea9b2SNeilBrown 2577c19d5798SNeilBrown err = -EIO; 2578709ae487SNeilBrown conf->last_used = -1; 25798f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 25801da177e4SLinus Torvalds 25811da177e4SLinus Torvalds disk = conf->mirrors + i; 25821da177e4SLinus Torvalds 2583c19d5798SNeilBrown if (i < conf->raid_disks && 2584c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2585c19d5798SNeilBrown /* This slot has a replacement. */ 2586c19d5798SNeilBrown if (!disk->rdev) { 2587c19d5798SNeilBrown /* No original, just make the replacement 2588c19d5798SNeilBrown * a recovering spare 2589c19d5798SNeilBrown */ 2590c19d5798SNeilBrown disk->rdev = 2591c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2592c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2593c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2594c19d5798SNeilBrown /* Original is not in_sync - bad */ 2595c19d5798SNeilBrown goto abort; 2596c19d5798SNeilBrown } 2597c19d5798SNeilBrown 25985fd6c1dcSNeilBrown if (!disk->rdev || 25995fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 26001da177e4SLinus Torvalds disk->head_position = 0; 2601918f0238SNeilBrown if (disk->rdev) 260217571284SNeilBrown conf->fullsync = 1; 2603709ae487SNeilBrown } else if (conf->last_used < 0) 2604709ae487SNeilBrown /* 2605709ae487SNeilBrown * The first working device is used as a 2606709ae487SNeilBrown * starting point to read balancing. 2607709ae487SNeilBrown */ 2608709ae487SNeilBrown conf->last_used = i; 26091da177e4SLinus Torvalds } 2610709ae487SNeilBrown 2611709ae487SNeilBrown if (conf->last_used < 0) { 26129dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", 261311ce99e6SNeilBrown mdname(mddev)); 2614709ae487SNeilBrown goto abort; 261511ce99e6SNeilBrown } 2616709ae487SNeilBrown err = -ENOMEM; 2617709ae487SNeilBrown conf->thread = md_register_thread(raid1d, mddev, NULL); 2618709ae487SNeilBrown if (!conf->thread) { 26191da177e4SLinus Torvalds printk(KERN_ERR 26209dd1e2faSNeilBrown "md/raid1:%s: couldn't allocate thread\n", 26211da177e4SLinus Torvalds mdname(mddev)); 2622709ae487SNeilBrown goto abort; 26231da177e4SLinus Torvalds } 2624191ea9b2SNeilBrown 2625709ae487SNeilBrown return conf; 2626709ae487SNeilBrown 2627709ae487SNeilBrown abort: 2628709ae487SNeilBrown if (conf) { 2629709ae487SNeilBrown if (conf->r1bio_pool) 2630709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2631709ae487SNeilBrown kfree(conf->mirrors); 2632709ae487SNeilBrown safe_put_page(conf->tmppage); 2633709ae487SNeilBrown kfree(conf->poolinfo); 2634709ae487SNeilBrown kfree(conf); 2635709ae487SNeilBrown } 2636709ae487SNeilBrown return ERR_PTR(err); 2637709ae487SNeilBrown } 2638709ae487SNeilBrown 2639fd01b88cSNeilBrown static int run(struct mddev *mddev) 2640709ae487SNeilBrown { 2641e8096360SNeilBrown struct r1conf *conf; 2642709ae487SNeilBrown int i; 26433cb03002SNeilBrown struct md_rdev *rdev; 2644709ae487SNeilBrown 2645709ae487SNeilBrown if (mddev->level != 1) { 26469dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", 2647709ae487SNeilBrown mdname(mddev), mddev->level); 2648709ae487SNeilBrown return -EIO; 2649709ae487SNeilBrown } 2650709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 26519dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", 2652709ae487SNeilBrown mdname(mddev)); 2653709ae487SNeilBrown return -EIO; 2654709ae487SNeilBrown } 2655709ae487SNeilBrown /* 2656709ae487SNeilBrown * copy the already verified devices into our private RAID1 2657709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2658709ae487SNeilBrown * should be freed in stop()] 2659709ae487SNeilBrown */ 2660709ae487SNeilBrown if (mddev->private == NULL) 2661709ae487SNeilBrown conf = setup_conf(mddev); 2662709ae487SNeilBrown else 2663709ae487SNeilBrown conf = mddev->private; 2664709ae487SNeilBrown 2665709ae487SNeilBrown if (IS_ERR(conf)) 2666709ae487SNeilBrown return PTR_ERR(conf); 2667709ae487SNeilBrown 2668dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 26691ed7242eSJonathan Brassow if (!mddev->gendisk) 26701ed7242eSJonathan Brassow continue; 2671709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2672709ae487SNeilBrown rdev->data_offset << 9); 2673709ae487SNeilBrown } 2674709ae487SNeilBrown 2675709ae487SNeilBrown mddev->degraded = 0; 2676709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2677709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2678709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2679709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2680709ae487SNeilBrown mddev->degraded++; 2681709ae487SNeilBrown 2682709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2683709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2684709ae487SNeilBrown 26858c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 26869dd1e2faSNeilBrown printk(KERN_NOTICE "md/raid1:%s: not clean" 26878c6ac868SAndre Noll " -- starting background reconstruction\n", 26888c6ac868SAndre Noll mdname(mddev)); 26891da177e4SLinus Torvalds printk(KERN_INFO 26909dd1e2faSNeilBrown "md/raid1:%s: active with %d out of %d mirrors\n", 26911da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 26921da177e4SLinus Torvalds mddev->raid_disks); 2693709ae487SNeilBrown 26941da177e4SLinus Torvalds /* 26951da177e4SLinus Torvalds * Ok, everything is just fine now 26961da177e4SLinus Torvalds */ 2697709ae487SNeilBrown mddev->thread = conf->thread; 2698709ae487SNeilBrown conf->thread = NULL; 2699709ae487SNeilBrown mddev->private = conf; 2700709ae487SNeilBrown 27011f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 27021da177e4SLinus Torvalds 27031ed7242eSJonathan Brassow if (mddev->queue) { 27040d129228SNeilBrown mddev->queue->backing_dev_info.congested_fn = raid1_congested; 27050d129228SNeilBrown mddev->queue->backing_dev_info.congested_data = mddev; 27066b740b8dSNeilBrown blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); 27071ed7242eSJonathan Brassow } 2708a91a2785SMartin K. Petersen return md_integrity_register(mddev); 27091da177e4SLinus Torvalds } 27101da177e4SLinus Torvalds 2711fd01b88cSNeilBrown static int stop(struct mddev *mddev) 27121da177e4SLinus Torvalds { 2713e8096360SNeilBrown struct r1conf *conf = mddev->private; 27144b6d287fSNeilBrown struct bitmap *bitmap = mddev->bitmap; 27154b6d287fSNeilBrown 27164b6d287fSNeilBrown /* wait for behind writes to complete */ 2717e555190dSNeilBrown if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 27189dd1e2faSNeilBrown printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", 27199dd1e2faSNeilBrown mdname(mddev)); 27204b6d287fSNeilBrown /* need to kick something here to make sure I/O goes? */ 2721e555190dSNeilBrown wait_event(bitmap->behind_wait, 2722e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 27234b6d287fSNeilBrown } 27241da177e4SLinus Torvalds 2725409c57f3SNeilBrown raise_barrier(conf); 2726409c57f3SNeilBrown lower_barrier(conf); 2727409c57f3SNeilBrown 272801f96c0aSNeilBrown md_unregister_thread(&mddev->thread); 27291da177e4SLinus Torvalds if (conf->r1bio_pool) 27301da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 27311da177e4SLinus Torvalds kfree(conf->mirrors); 27321da177e4SLinus Torvalds kfree(conf->poolinfo); 27331da177e4SLinus Torvalds kfree(conf); 27341da177e4SLinus Torvalds mddev->private = NULL; 27351da177e4SLinus Torvalds return 0; 27361da177e4SLinus Torvalds } 27371da177e4SLinus Torvalds 2738fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 27391da177e4SLinus Torvalds { 27401da177e4SLinus Torvalds /* no resync is happening, and there is enough space 27411da177e4SLinus Torvalds * on all devices, so we can resize. 27421da177e4SLinus Torvalds * We need to make sure resync covers any new space. 27431da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 27441da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 27451da177e4SLinus Torvalds * worth it. 27461da177e4SLinus Torvalds */ 27471f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); 2748b522adcdSDan Williams if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) 2749b522adcdSDan Williams return -EINVAL; 2750f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 2751449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 2752b522adcdSDan Williams if (sectors > mddev->dev_sectors && 2753b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 275458c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 27551da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 27561da177e4SLinus Torvalds } 2757b522adcdSDan Williams mddev->dev_sectors = sectors; 27584b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 27591da177e4SLinus Torvalds return 0; 27601da177e4SLinus Torvalds } 27611da177e4SLinus Torvalds 2762fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 27631da177e4SLinus Torvalds { 27641da177e4SLinus Torvalds /* We need to: 27651da177e4SLinus Torvalds * 1/ resize the r1bio_pool 27661da177e4SLinus Torvalds * 2/ resize conf->mirrors 27671da177e4SLinus Torvalds * 27681da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 27691da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 27701da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 27716ea9c07cSNeilBrown * 27726ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 27736ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 27741da177e4SLinus Torvalds */ 27751da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 27761da177e4SLinus Torvalds struct pool_info *newpoolinfo; 27770f6d02d5SNeilBrown struct mirror_info *newmirrors; 2778e8096360SNeilBrown struct r1conf *conf = mddev->private; 277963c70c4fSNeilBrown int cnt, raid_disks; 2780c04be0aaSNeilBrown unsigned long flags; 2781b5470dc5SDan Williams int d, d2, err; 27821da177e4SLinus Torvalds 278363c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 2784664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 278563c70c4fSNeilBrown mddev->layout != mddev->new_layout || 278663c70c4fSNeilBrown mddev->level != mddev->new_level) { 2787664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 278863c70c4fSNeilBrown mddev->new_layout = mddev->layout; 278963c70c4fSNeilBrown mddev->new_level = mddev->level; 279063c70c4fSNeilBrown return -EINVAL; 279163c70c4fSNeilBrown } 279263c70c4fSNeilBrown 2793b5470dc5SDan Williams err = md_allow_write(mddev); 2794b5470dc5SDan Williams if (err) 2795b5470dc5SDan Williams return err; 27962a2275d6SNeilBrown 279763c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 279863c70c4fSNeilBrown 27996ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 28006ea9c07cSNeilBrown cnt=0; 28016ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 28021da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 28036ea9c07cSNeilBrown cnt++; 28046ea9c07cSNeilBrown if (cnt > raid_disks) 28051da177e4SLinus Torvalds return -EBUSY; 28066ea9c07cSNeilBrown } 28071da177e4SLinus Torvalds 28081da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 28091da177e4SLinus Torvalds if (!newpoolinfo) 28101da177e4SLinus Torvalds return -ENOMEM; 28111da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 28128f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 28131da177e4SLinus Torvalds 28141da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 28151da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 28161da177e4SLinus Torvalds if (!newpool) { 28171da177e4SLinus Torvalds kfree(newpoolinfo); 28181da177e4SLinus Torvalds return -ENOMEM; 28191da177e4SLinus Torvalds } 28208f19ccb2SNeilBrown newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks * 2, 28218f19ccb2SNeilBrown GFP_KERNEL); 28221da177e4SLinus Torvalds if (!newmirrors) { 28231da177e4SLinus Torvalds kfree(newpoolinfo); 28241da177e4SLinus Torvalds mempool_destroy(newpool); 28251da177e4SLinus Torvalds return -ENOMEM; 28261da177e4SLinus Torvalds } 28271da177e4SLinus Torvalds 282817999be4SNeilBrown raise_barrier(conf); 28291da177e4SLinus Torvalds 28301da177e4SLinus Torvalds /* ok, everything is stopped */ 28311da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 28321da177e4SLinus Torvalds conf->r1bio_pool = newpool; 28336ea9c07cSNeilBrown 2834a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 28353cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 2836a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 283736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 2838a88aa786SNeilBrown rdev->raid_disk = d2; 283936fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 284036fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 2841a88aa786SNeilBrown printk(KERN_WARNING 284236fad858SNamhyung Kim "md/raid1:%s: cannot register rd%d\n", 284336fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 2844a88aa786SNeilBrown } 2845a88aa786SNeilBrown if (rdev) 2846a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 28476ea9c07cSNeilBrown } 28481da177e4SLinus Torvalds kfree(conf->mirrors); 28491da177e4SLinus Torvalds conf->mirrors = newmirrors; 28501da177e4SLinus Torvalds kfree(conf->poolinfo); 28511da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 28521da177e4SLinus Torvalds 2853c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 28541da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 2855c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 28561da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 285763c70c4fSNeilBrown mddev->delta_disks = 0; 28581da177e4SLinus Torvalds 28596ea9c07cSNeilBrown conf->last_used = 0; /* just make sure it is in-range */ 286017999be4SNeilBrown lower_barrier(conf); 28611da177e4SLinus Torvalds 28621da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 28631da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 28641da177e4SLinus Torvalds 28651da177e4SLinus Torvalds mempool_destroy(oldpool); 28661da177e4SLinus Torvalds return 0; 28671da177e4SLinus Torvalds } 28681da177e4SLinus Torvalds 2869fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 287036fa3063SNeilBrown { 2871e8096360SNeilBrown struct r1conf *conf = mddev->private; 287236fa3063SNeilBrown 287336fa3063SNeilBrown switch(state) { 28746eef4b21SNeilBrown case 2: /* wake for suspend */ 28756eef4b21SNeilBrown wake_up(&conf->wait_barrier); 28766eef4b21SNeilBrown break; 28779e6603daSNeilBrown case 1: 287817999be4SNeilBrown raise_barrier(conf); 287936fa3063SNeilBrown break; 28809e6603daSNeilBrown case 0: 288117999be4SNeilBrown lower_barrier(conf); 288236fa3063SNeilBrown break; 288336fa3063SNeilBrown } 288436fa3063SNeilBrown } 288536fa3063SNeilBrown 2886fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 2887709ae487SNeilBrown { 2888709ae487SNeilBrown /* raid1 can take over: 2889709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 2890709ae487SNeilBrown */ 2891709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 2892e8096360SNeilBrown struct r1conf *conf; 2893709ae487SNeilBrown mddev->new_level = 1; 2894709ae487SNeilBrown mddev->new_layout = 0; 2895709ae487SNeilBrown mddev->new_chunk_sectors = 0; 2896709ae487SNeilBrown conf = setup_conf(mddev); 2897709ae487SNeilBrown if (!IS_ERR(conf)) 2898709ae487SNeilBrown conf->barrier = 1; 2899709ae487SNeilBrown return conf; 2900709ae487SNeilBrown } 2901709ae487SNeilBrown return ERR_PTR(-EINVAL); 2902709ae487SNeilBrown } 29031da177e4SLinus Torvalds 290484fc4b56SNeilBrown static struct md_personality raid1_personality = 29051da177e4SLinus Torvalds { 29061da177e4SLinus Torvalds .name = "raid1", 29072604b703SNeilBrown .level = 1, 29081da177e4SLinus Torvalds .owner = THIS_MODULE, 29091da177e4SLinus Torvalds .make_request = make_request, 29101da177e4SLinus Torvalds .run = run, 29111da177e4SLinus Torvalds .stop = stop, 29121da177e4SLinus Torvalds .status = status, 29131da177e4SLinus Torvalds .error_handler = error, 29141da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 29151da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 29161da177e4SLinus Torvalds .spare_active = raid1_spare_active, 29171da177e4SLinus Torvalds .sync_request = sync_request, 29181da177e4SLinus Torvalds .resize = raid1_resize, 291980c3a6ceSDan Williams .size = raid1_size, 292063c70c4fSNeilBrown .check_reshape = raid1_reshape, 292136fa3063SNeilBrown .quiesce = raid1_quiesce, 2922709ae487SNeilBrown .takeover = raid1_takeover, 29231da177e4SLinus Torvalds }; 29241da177e4SLinus Torvalds 29251da177e4SLinus Torvalds static int __init raid_init(void) 29261da177e4SLinus Torvalds { 29272604b703SNeilBrown return register_md_personality(&raid1_personality); 29281da177e4SLinus Torvalds } 29291da177e4SLinus Torvalds 29301da177e4SLinus Torvalds static void raid_exit(void) 29311da177e4SLinus Torvalds { 29322604b703SNeilBrown unregister_md_personality(&raid1_personality); 29331da177e4SLinus Torvalds } 29341da177e4SLinus Torvalds 29351da177e4SLinus Torvalds module_init(raid_init); 29361da177e4SLinus Torvalds module_exit(raid_exit); 29371da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 29380efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 29391da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 2940d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 29412604b703SNeilBrown MODULE_ALIAS("md-level-1"); 294234db0cd6SNeilBrown 294334db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 2944