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 1671da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; 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 1883e198f78SNeilBrown for (i=0; i<conf->raid_disks; 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; 280ba3ae3beSNamhyung Kim int raid_disks = r1_bio->mddev->raid_disks; 281ba3ae3beSNamhyung Kim 282ba3ae3beSNamhyung Kim for (mirror = 0; mirror < raid_disks; mirror++) 283ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 284ba3ae3beSNamhyung Kim break; 285ba3ae3beSNamhyung Kim 286ba3ae3beSNamhyung Kim BUG_ON(mirror == raid_disks); 287ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 288ba3ae3beSNamhyung Kim 289ba3ae3beSNamhyung Kim return mirror; 290ba3ae3beSNamhyung Kim } 291ba3ae3beSNamhyung Kim 2926712ecf8SNeilBrown static void raid1_end_read_request(struct bio *bio, int error) 2931da177e4SLinus Torvalds { 2941da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2959f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 2961da177e4SLinus Torvalds int mirror; 297e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds mirror = r1_bio->read_disk; 3001da177e4SLinus Torvalds /* 3011da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3021da177e4SLinus Torvalds */ 303ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 304ddaf22abSNeilBrown 305220946c9SNeilBrown if (uptodate) 3061da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 307dd00a99eSNeilBrown else { 308dd00a99eSNeilBrown /* If all other devices have failed, we want to return 309dd00a99eSNeilBrown * the error upwards rather than fail the last device. 310dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 311dd00a99eSNeilBrown */ 312dd00a99eSNeilBrown unsigned long flags; 313dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 314dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 315dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 316dd00a99eSNeilBrown !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) 317dd00a99eSNeilBrown uptodate = 1; 318dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 319dd00a99eSNeilBrown } 3201da177e4SLinus Torvalds 321dd00a99eSNeilBrown if (uptodate) 3221da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 323dd00a99eSNeilBrown else { 3241da177e4SLinus Torvalds /* 3251da177e4SLinus Torvalds * oops, read error: 3261da177e4SLinus Torvalds */ 3271da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3288bda470eSChristian Dietrich printk_ratelimited( 3298bda470eSChristian Dietrich KERN_ERR "md/raid1:%s: %s: " 3308bda470eSChristian Dietrich "rescheduling sector %llu\n", 3319dd1e2faSNeilBrown mdname(conf->mddev), 3328bda470eSChristian Dietrich bdevname(conf->mirrors[mirror].rdev->bdev, 3338bda470eSChristian Dietrich b), 3348bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 335d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3361da177e4SLinus Torvalds reschedule_retry(r1_bio); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3429f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3434e78064fSNeilBrown { 3444e78064fSNeilBrown /* it really is the end of this request */ 3454e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3464e78064fSNeilBrown /* free extra copy of the data pages */ 347af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3484e78064fSNeilBrown while (i--) 3492ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3502ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3512ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3524e78064fSNeilBrown } 3534e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3544e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3554e78064fSNeilBrown r1_bio->sectors, 3564e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 357af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3584e78064fSNeilBrown md_write_end(r1_bio->mddev); 359cd5ff9a1SNeilBrown } 360cd5ff9a1SNeilBrown 3619f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 362cd5ff9a1SNeilBrown { 363cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 364cd5ff9a1SNeilBrown return; 365cd5ff9a1SNeilBrown 366cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 367cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 368cd5ff9a1SNeilBrown else { 369cd5ff9a1SNeilBrown close_write(r1_bio); 3704367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3714367af55SNeilBrown reschedule_retry(r1_bio); 3724367af55SNeilBrown else 3734e78064fSNeilBrown raid_end_bio_io(r1_bio); 3744e78064fSNeilBrown } 3754e78064fSNeilBrown } 3764e78064fSNeilBrown 3776712ecf8SNeilBrown static void raid1_end_write_request(struct bio *bio, int error) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3809f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 381a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 382e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 38304b857f7SNeilBrown struct bio *to_put = NULL; 3841da177e4SLinus Torvalds 385ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 388e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 3891da177e4SLinus Torvalds */ 390191ea9b2SNeilBrown if (!uptodate) { 391cd5ff9a1SNeilBrown set_bit(WriteErrorSeen, 392cd5ff9a1SNeilBrown &conf->mirrors[mirror].rdev->flags); 393cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 3944367af55SNeilBrown } else { 3951da177e4SLinus Torvalds /* 396e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 397e9c7469bSTejun Heo * will return a good error code for to the higher 398e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 399e9c7469bSTejun Heo * fails. 4001da177e4SLinus Torvalds * 401e9c7469bSTejun Heo * The 'master' represents the composite IO operation 402e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 403e9c7469bSTejun Heo * will wait for the 'master' bio. 4041da177e4SLinus Torvalds */ 4054367af55SNeilBrown sector_t first_bad; 4064367af55SNeilBrown int bad_sectors; 4074367af55SNeilBrown 408cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 409cd5ff9a1SNeilBrown to_put = bio; 4101da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4111da177e4SLinus Torvalds 4124367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 4134367af55SNeilBrown if (is_badblock(conf->mirrors[mirror].rdev, 4144367af55SNeilBrown r1_bio->sector, r1_bio->sectors, 4154367af55SNeilBrown &first_bad, &bad_sectors)) { 4164367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4174367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4184367af55SNeilBrown } 4194367af55SNeilBrown } 4204367af55SNeilBrown 4214b6d287fSNeilBrown if (behind) { 4224b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 4234b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4244b6d287fSNeilBrown 425e9c7469bSTejun Heo /* 426e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 427e9c7469bSTejun Heo * has safely reached all non-writemostly 428e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 429e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 430e9c7469bSTejun Heo * -EIO here, instead we'll wait 431e9c7469bSTejun Heo */ 4324b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4334b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4344b6d287fSNeilBrown /* Maybe we can return now */ 4354b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4364b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 43736a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 43836a4e1feSNeilBrown " %llu-%llu\n", 4394b6d287fSNeilBrown (unsigned long long) mbio->bi_sector, 4404b6d287fSNeilBrown (unsigned long long) mbio->bi_sector + 4414b6d287fSNeilBrown (mbio->bi_size >> 9) - 1); 442d2eb35acSNeilBrown call_bio_endio(r1_bio); 4434b6d287fSNeilBrown } 4444b6d287fSNeilBrown } 4454b6d287fSNeilBrown } 4464367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 4474367af55SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, 4484367af55SNeilBrown conf->mddev); 449e9c7469bSTejun Heo 4501da177e4SLinus Torvalds /* 4511da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4521da177e4SLinus Torvalds * already. 4531da177e4SLinus Torvalds */ 454af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 455c70810b3SNeilBrown 45604b857f7SNeilBrown if (to_put) 45704b857f7SNeilBrown bio_put(to_put); 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 4621da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4631da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4641da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4651da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4661da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 4671da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 4681da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 4691da177e4SLinus Torvalds * 4701da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 4711da177e4SLinus Torvalds * because position is mirror, not device based. 4721da177e4SLinus Torvalds * 4731da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 4741da177e4SLinus Torvalds */ 475e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 4761da177e4SLinus Torvalds { 477af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 478d2eb35acSNeilBrown int sectors; 479d2eb35acSNeilBrown int best_good_sectors; 480f3ac8bf7SNeilBrown int start_disk; 48176073054SNeilBrown int best_disk; 482f3ac8bf7SNeilBrown int i; 48376073054SNeilBrown sector_t best_dist; 4843cb03002SNeilBrown struct md_rdev *rdev; 485f3ac8bf7SNeilBrown int choose_first; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds rcu_read_lock(); 4881da177e4SLinus Torvalds /* 4898ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 4901da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 4911da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 4921da177e4SLinus Torvalds */ 4931da177e4SLinus Torvalds retry: 494d2eb35acSNeilBrown sectors = r1_bio->sectors; 49576073054SNeilBrown best_disk = -1; 49676073054SNeilBrown best_dist = MaxSector; 497d2eb35acSNeilBrown best_good_sectors = 0; 498d2eb35acSNeilBrown 4991da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 5001da177e4SLinus Torvalds (this_sector + sectors >= conf->next_resync)) { 501f3ac8bf7SNeilBrown choose_first = 1; 502f3ac8bf7SNeilBrown start_disk = 0; 503f3ac8bf7SNeilBrown } else { 504f3ac8bf7SNeilBrown choose_first = 0; 505f3ac8bf7SNeilBrown start_disk = conf->last_used; 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 508f3ac8bf7SNeilBrown for (i = 0 ; i < conf->raid_disks ; i++) { 50976073054SNeilBrown sector_t dist; 510d2eb35acSNeilBrown sector_t first_bad; 511d2eb35acSNeilBrown int bad_sectors; 512d2eb35acSNeilBrown 513f3ac8bf7SNeilBrown int disk = start_disk + i; 514f3ac8bf7SNeilBrown if (disk >= conf->raid_disks) 515f3ac8bf7SNeilBrown disk -= conf->raid_disks; 5168ddf9efeSNeilBrown 517f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 518f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 519f3ac8bf7SNeilBrown || rdev == NULL 52076073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 521f3ac8bf7SNeilBrown continue; 52276073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 52376073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 52476073054SNeilBrown continue; 52576073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 52676073054SNeilBrown /* Don't balance among write-mostly, just 52776073054SNeilBrown * use the first as a last resort */ 52876073054SNeilBrown if (best_disk < 0) 52976073054SNeilBrown best_disk = disk; 53076073054SNeilBrown continue; 5318ddf9efeSNeilBrown } 53276073054SNeilBrown /* This is a reasonable device to use. It might 53376073054SNeilBrown * even be best. 5341da177e4SLinus Torvalds */ 535d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 536d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 537d2eb35acSNeilBrown if (best_dist < MaxSector) 538d2eb35acSNeilBrown /* already have a better device */ 539d2eb35acSNeilBrown continue; 540d2eb35acSNeilBrown if (first_bad <= this_sector) { 541d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 542d2eb35acSNeilBrown * device, then we must not read beyond 543d2eb35acSNeilBrown * bad_sectors from another device.. 544d2eb35acSNeilBrown */ 545d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 546d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 547d2eb35acSNeilBrown sectors = bad_sectors; 548d2eb35acSNeilBrown if (best_good_sectors > sectors) 549d2eb35acSNeilBrown best_good_sectors = sectors; 550d2eb35acSNeilBrown 551d2eb35acSNeilBrown } else { 552d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 553d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 554d2eb35acSNeilBrown best_good_sectors = good_sectors; 555d2eb35acSNeilBrown best_disk = disk; 556d2eb35acSNeilBrown } 557d2eb35acSNeilBrown if (choose_first) 558d2eb35acSNeilBrown break; 559d2eb35acSNeilBrown } 560d2eb35acSNeilBrown continue; 561d2eb35acSNeilBrown } else 562d2eb35acSNeilBrown best_good_sectors = sectors; 563d2eb35acSNeilBrown 56476073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 56576073054SNeilBrown if (choose_first 56676073054SNeilBrown /* Don't change to another disk for sequential reads */ 56776073054SNeilBrown || conf->next_seq_sect == this_sector 56876073054SNeilBrown || dist == 0 56976073054SNeilBrown /* If device is idle, use it */ 57076073054SNeilBrown || atomic_read(&rdev->nr_pending) == 0) { 57176073054SNeilBrown best_disk = disk; 5721da177e4SLinus Torvalds break; 5731da177e4SLinus Torvalds } 57476073054SNeilBrown if (dist < best_dist) { 57576073054SNeilBrown best_dist = dist; 57676073054SNeilBrown best_disk = disk; 5771da177e4SLinus Torvalds } 578f3ac8bf7SNeilBrown } 5791da177e4SLinus Torvalds 58076073054SNeilBrown if (best_disk >= 0) { 58176073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 5828ddf9efeSNeilBrown if (!rdev) 5838ddf9efeSNeilBrown goto retry; 5848ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 58576073054SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 5861da177e4SLinus Torvalds /* cannot risk returning a device that failed 5871da177e4SLinus Torvalds * before we inc'ed nr_pending 5881da177e4SLinus Torvalds */ 58903c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 5901da177e4SLinus Torvalds goto retry; 5911da177e4SLinus Torvalds } 592d2eb35acSNeilBrown sectors = best_good_sectors; 5938ddf9efeSNeilBrown conf->next_seq_sect = this_sector + sectors; 59476073054SNeilBrown conf->last_used = best_disk; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds rcu_read_unlock(); 597d2eb35acSNeilBrown *max_sectors = sectors; 5981da177e4SLinus Torvalds 59976073054SNeilBrown return best_disk; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 602fd01b88cSNeilBrown int md_raid1_congested(struct mddev *mddev, int bits) 6030d129228SNeilBrown { 604e8096360SNeilBrown struct r1conf *conf = mddev->private; 6050d129228SNeilBrown int i, ret = 0; 6060d129228SNeilBrown 60734db0cd6SNeilBrown if ((bits & (1 << BDI_async_congested)) && 60834db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 60934db0cd6SNeilBrown return 1; 61034db0cd6SNeilBrown 6110d129228SNeilBrown rcu_read_lock(); 6120d129228SNeilBrown for (i = 0; i < mddev->raid_disks; i++) { 6133cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 6140d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 615165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 6160d129228SNeilBrown 6171ed7242eSJonathan Brassow BUG_ON(!q); 6181ed7242eSJonathan Brassow 6190d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 6200d129228SNeilBrown * non-congested targets, it can be removed 6210d129228SNeilBrown */ 62291a9e99dSAlexander Beregalov if ((bits & (1<<BDI_async_congested)) || 1) 6230d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 6240d129228SNeilBrown else 6250d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 6260d129228SNeilBrown } 6270d129228SNeilBrown } 6280d129228SNeilBrown rcu_read_unlock(); 6290d129228SNeilBrown return ret; 6300d129228SNeilBrown } 6311ed7242eSJonathan Brassow EXPORT_SYMBOL_GPL(md_raid1_congested); 6320d129228SNeilBrown 6331ed7242eSJonathan Brassow static int raid1_congested(void *data, int bits) 6341ed7242eSJonathan Brassow { 635fd01b88cSNeilBrown struct mddev *mddev = data; 6361ed7242eSJonathan Brassow 6371ed7242eSJonathan Brassow return mddev_congested(mddev, bits) || 6381ed7242eSJonathan Brassow md_raid1_congested(mddev, bits); 6391ed7242eSJonathan Brassow } 6400d129228SNeilBrown 641e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 642a35e63efSNeilBrown { 643a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 644a35e63efSNeilBrown * bitmap updates get flushed here. 645a35e63efSNeilBrown */ 646a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 647a35e63efSNeilBrown 648a35e63efSNeilBrown if (conf->pending_bio_list.head) { 649a35e63efSNeilBrown struct bio *bio; 650a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 65134db0cd6SNeilBrown conf->pending_count = 0; 652a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 653a35e63efSNeilBrown /* flush any pending bitmap writes to 654a35e63efSNeilBrown * disk before proceeding w/ I/O */ 655a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 65634db0cd6SNeilBrown wake_up(&conf->wait_barrier); 657a35e63efSNeilBrown 658a35e63efSNeilBrown while (bio) { /* submit pending writes */ 659a35e63efSNeilBrown struct bio *next = bio->bi_next; 660a35e63efSNeilBrown bio->bi_next = NULL; 661a35e63efSNeilBrown generic_make_request(bio); 662a35e63efSNeilBrown bio = next; 663a35e63efSNeilBrown } 664a35e63efSNeilBrown } else 665a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 6667eaceaccSJens Axboe } 6677eaceaccSJens Axboe 66817999be4SNeilBrown /* Barriers.... 66917999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 67017999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 67117999be4SNeilBrown * To do this we raise a 'barrier'. 67217999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 67317999be4SNeilBrown * to count how many activities are happening which preclude 67417999be4SNeilBrown * normal IO. 67517999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 67617999be4SNeilBrown * i.e. if nr_pending == 0. 67717999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 67817999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 67917999be4SNeilBrown * is ready, no other operations which require a barrier will start 68017999be4SNeilBrown * until the IO request has had a chance. 68117999be4SNeilBrown * 68217999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 68317999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 68417999be4SNeilBrown * allow_barrier when it has finished its IO. 68517999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 68617999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 68717999be4SNeilBrown * lower_barrier when the particular background IO completes. 6881da177e4SLinus Torvalds */ 6891da177e4SLinus Torvalds #define RESYNC_DEPTH 32 6901da177e4SLinus Torvalds 691e8096360SNeilBrown static void raise_barrier(struct r1conf *conf) 6921da177e4SLinus Torvalds { 6931da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 6941da177e4SLinus Torvalds 69517999be4SNeilBrown /* Wait until no block IO is waiting */ 69617999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 697c3b328acSNeilBrown conf->resync_lock, ); 69817999be4SNeilBrown 69917999be4SNeilBrown /* block any new IO from starting */ 70017999be4SNeilBrown conf->barrier++; 70117999be4SNeilBrown 702046abeedSNeilBrown /* Now wait for all pending IO to complete */ 70317999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 70417999be4SNeilBrown !conf->nr_pending && conf->barrier < RESYNC_DEPTH, 705c3b328acSNeilBrown conf->resync_lock, ); 70617999be4SNeilBrown 7071da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 7081da177e4SLinus Torvalds } 7091da177e4SLinus Torvalds 710e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 71117999be4SNeilBrown { 71217999be4SNeilBrown unsigned long flags; 713709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 71417999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 71517999be4SNeilBrown conf->barrier--; 71617999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 71717999be4SNeilBrown wake_up(&conf->wait_barrier); 71817999be4SNeilBrown } 71917999be4SNeilBrown 720e8096360SNeilBrown static void wait_barrier(struct r1conf *conf) 72117999be4SNeilBrown { 72217999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 72317999be4SNeilBrown if (conf->barrier) { 72417999be4SNeilBrown conf->nr_waiting++; 72517999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->barrier, 72617999be4SNeilBrown conf->resync_lock, 727c3b328acSNeilBrown ); 72817999be4SNeilBrown conf->nr_waiting--; 72917999be4SNeilBrown } 73017999be4SNeilBrown conf->nr_pending++; 73117999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 73217999be4SNeilBrown } 73317999be4SNeilBrown 734e8096360SNeilBrown static void allow_barrier(struct r1conf *conf) 73517999be4SNeilBrown { 73617999be4SNeilBrown unsigned long flags; 73717999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 73817999be4SNeilBrown conf->nr_pending--; 73917999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 74017999be4SNeilBrown wake_up(&conf->wait_barrier); 74117999be4SNeilBrown } 74217999be4SNeilBrown 743e8096360SNeilBrown static void freeze_array(struct r1conf *conf) 744ddaf22abSNeilBrown { 745ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 746ddaf22abSNeilBrown * go quite. 747ddaf22abSNeilBrown * We increment barrier and nr_waiting, and then 7481c830532SNeilBrown * wait until nr_pending match nr_queued+1 7491c830532SNeilBrown * This is called in the context of one normal IO request 7501c830532SNeilBrown * that has failed. Thus any sync request that might be pending 7511c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 7521c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 7531c830532SNeilBrown * Thus the number queued (nr_queued) plus this request (1) 7541c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 7551c830532SNeilBrown * we continue. 756ddaf22abSNeilBrown */ 757ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 758ddaf22abSNeilBrown conf->barrier++; 759ddaf22abSNeilBrown conf->nr_waiting++; 760ddaf22abSNeilBrown wait_event_lock_irq(conf->wait_barrier, 7611c830532SNeilBrown conf->nr_pending == conf->nr_queued+1, 762ddaf22abSNeilBrown conf->resync_lock, 763c3b328acSNeilBrown flush_pending_writes(conf)); 764ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 765ddaf22abSNeilBrown } 766e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 767ddaf22abSNeilBrown { 768ddaf22abSNeilBrown /* reverse the effect of the freeze */ 769ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 770ddaf22abSNeilBrown conf->barrier--; 771ddaf22abSNeilBrown conf->nr_waiting--; 772ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 773ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 774ddaf22abSNeilBrown } 775ddaf22abSNeilBrown 77617999be4SNeilBrown 7774e78064fSNeilBrown /* duplicate the data pages for behind I/O 7784e78064fSNeilBrown */ 7799f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 7804b6d287fSNeilBrown { 7814b6d287fSNeilBrown int i; 7824b6d287fSNeilBrown struct bio_vec *bvec; 7832ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 7844b6d287fSNeilBrown GFP_NOIO); 7852ca68f5eSNeilBrown if (unlikely(!bvecs)) 786af6d7b76SNeilBrown return; 7874b6d287fSNeilBrown 7884b6d287fSNeilBrown bio_for_each_segment(bvec, bio, i) { 7892ca68f5eSNeilBrown bvecs[i] = *bvec; 7902ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 7912ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 7924b6d287fSNeilBrown goto do_sync_io; 7932ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 7944b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 7952ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 7964b6d287fSNeilBrown kunmap(bvec->bv_page); 7974b6d287fSNeilBrown } 7982ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 799af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 800af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 801af6d7b76SNeilBrown return; 8024b6d287fSNeilBrown 8034b6d287fSNeilBrown do_sync_io: 804af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 8052ca68f5eSNeilBrown if (bvecs[i].bv_page) 8062ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 8072ca68f5eSNeilBrown kfree(bvecs); 80836a4e1feSNeilBrown pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); 8094b6d287fSNeilBrown } 8104b6d287fSNeilBrown 811fd01b88cSNeilBrown static int make_request(struct mddev *mddev, struct bio * bio) 8121da177e4SLinus Torvalds { 813e8096360SNeilBrown struct r1conf *conf = mddev->private; 8140f6d02d5SNeilBrown struct mirror_info *mirror; 8159f2c9d12SNeilBrown struct r1bio *r1_bio; 8161da177e4SLinus Torvalds struct bio *read_bio; 8171f68f0c4SNeilBrown int i, disks; 81884255d10SNeilBrown struct bitmap *bitmap; 819191ea9b2SNeilBrown unsigned long flags; 820a362357bSJens Axboe const int rw = bio_data_dir(bio); 8212c7d46ecSNeilBrown const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); 822e9c7469bSTejun Heo const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); 8233cb03002SNeilBrown struct md_rdev *blocked_rdev; 824c3b328acSNeilBrown int plugged; 8251f68f0c4SNeilBrown int first_clone; 8261f68f0c4SNeilBrown int sectors_handled; 8271f68f0c4SNeilBrown int max_sectors; 828191ea9b2SNeilBrown 8291da177e4SLinus Torvalds /* 8301da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 8311da177e4SLinus Torvalds * thread has put up a bar for new requests. 8321da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 8331da177e4SLinus Torvalds */ 83462de608dSNeilBrown 8353d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 8363d310eb7SNeilBrown 8376eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 8386eef4b21SNeilBrown bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && 8396eef4b21SNeilBrown bio->bi_sector < mddev->suspend_hi) { 8406eef4b21SNeilBrown /* As the suspend_* range is controlled by 8416eef4b21SNeilBrown * userspace, we want an interruptible 8426eef4b21SNeilBrown * wait. 8436eef4b21SNeilBrown */ 8446eef4b21SNeilBrown DEFINE_WAIT(w); 8456eef4b21SNeilBrown for (;;) { 8466eef4b21SNeilBrown flush_signals(current); 8476eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 8486eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 8496eef4b21SNeilBrown if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || 8506eef4b21SNeilBrown bio->bi_sector >= mddev->suspend_hi) 8516eef4b21SNeilBrown break; 8526eef4b21SNeilBrown schedule(); 8536eef4b21SNeilBrown } 8546eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 8556eef4b21SNeilBrown } 85662de608dSNeilBrown 85717999be4SNeilBrown wait_barrier(conf); 8581da177e4SLinus Torvalds 85984255d10SNeilBrown bitmap = mddev->bitmap; 86084255d10SNeilBrown 8611da177e4SLinus Torvalds /* 8621da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 8631da177e4SLinus Torvalds * used and no empty request is available. 8641da177e4SLinus Torvalds * 8651da177e4SLinus Torvalds */ 8661da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds r1_bio->master_bio = bio; 8691da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 870191ea9b2SNeilBrown r1_bio->state = 0; 8711da177e4SLinus Torvalds r1_bio->mddev = mddev; 8721da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 8731da177e4SLinus Torvalds 874d2eb35acSNeilBrown /* We might need to issue multiple reads to different 875d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 876d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 877d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 878d2eb35acSNeilBrown * will be needed when requests complete. If it is 879d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 880d2eb35acSNeilBrown */ 881d2eb35acSNeilBrown bio->bi_phys_segments = 0; 882d2eb35acSNeilBrown clear_bit(BIO_SEG_VALID, &bio->bi_flags); 883d2eb35acSNeilBrown 884a362357bSJens Axboe if (rw == READ) { 8851da177e4SLinus Torvalds /* 8861da177e4SLinus Torvalds * read balancing logic: 8871da177e4SLinus Torvalds */ 888d2eb35acSNeilBrown int rdisk; 889d2eb35acSNeilBrown 890d2eb35acSNeilBrown read_again: 891d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds if (rdisk < 0) { 8941da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 8951da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 8961da177e4SLinus Torvalds return 0; 8971da177e4SLinus Torvalds } 8981da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 8991da177e4SLinus Torvalds 900e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 901e555190dSNeilBrown bitmap) { 902e555190dSNeilBrown /* Reading from a write-mostly device must 903e555190dSNeilBrown * take care not to over-take any writes 904e555190dSNeilBrown * that are 'behind' 905e555190dSNeilBrown */ 906e555190dSNeilBrown wait_event(bitmap->behind_wait, 907e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 908e555190dSNeilBrown } 9091da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 9101da177e4SLinus Torvalds 911a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 912d2eb35acSNeilBrown md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, 913d2eb35acSNeilBrown max_sectors); 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 9181da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 9191da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 9207b6d91daSChristoph Hellwig read_bio->bi_rw = READ | do_sync; 9211da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 9221da177e4SLinus Torvalds 923d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 924d2eb35acSNeilBrown /* could not read all from this device, so we will 925d2eb35acSNeilBrown * need another r1_bio. 926d2eb35acSNeilBrown */ 927d2eb35acSNeilBrown 928d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 929d2eb35acSNeilBrown - bio->bi_sector); 930d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 931d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 932d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 933d2eb35acSNeilBrown bio->bi_phys_segments = 2; 934d2eb35acSNeilBrown else 935d2eb35acSNeilBrown bio->bi_phys_segments++; 936d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 937d2eb35acSNeilBrown /* Cannot call generic_make_request directly 938d2eb35acSNeilBrown * as that will be queued in __make_request 939d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 940d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 941d2eb35acSNeilBrown */ 942d2eb35acSNeilBrown reschedule_retry(r1_bio); 943d2eb35acSNeilBrown 944d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 945d2eb35acSNeilBrown 946d2eb35acSNeilBrown r1_bio->master_bio = bio; 947d2eb35acSNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 948d2eb35acSNeilBrown r1_bio->state = 0; 949d2eb35acSNeilBrown r1_bio->mddev = mddev; 950d2eb35acSNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 951d2eb35acSNeilBrown goto read_again; 952d2eb35acSNeilBrown } else 9531da177e4SLinus Torvalds generic_make_request(read_bio); 9541da177e4SLinus Torvalds return 0; 9551da177e4SLinus Torvalds } 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds /* 9581da177e4SLinus Torvalds * WRITE: 9591da177e4SLinus Torvalds */ 96034db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 96134db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 96234db0cd6SNeilBrown wait_event(conf->wait_barrier, 96334db0cd6SNeilBrown conf->pending_count < max_queued_requests); 96434db0cd6SNeilBrown } 9651f68f0c4SNeilBrown /* first select target devices under rcu_lock and 9661da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 9671da177e4SLinus Torvalds * bios[x] to bio 9681f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 9691f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 9701f68f0c4SNeilBrown * blocks. 9711f68f0c4SNeilBrown * This potentially requires several writes to write around 9721f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 9731f68f0c4SNeilBrown * with a set of bios attached. 9741da177e4SLinus Torvalds */ 975c3b328acSNeilBrown plugged = mddev_check_plugged(mddev); 976c3b328acSNeilBrown 9771da177e4SLinus Torvalds disks = conf->raid_disks; 9786bfe0b49SDan Williams retry_write: 9796bfe0b49SDan Williams blocked_rdev = NULL; 9801da177e4SLinus Torvalds rcu_read_lock(); 9811f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 9821da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 9833cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 9846bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 9856bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 9866bfe0b49SDan Williams blocked_rdev = rdev; 9876bfe0b49SDan Williams break; 9886bfe0b49SDan Williams } 9891da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 9901f68f0c4SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) { 9911f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 9921f68f0c4SNeilBrown continue; 993964147d5SNeilBrown } 9941f68f0c4SNeilBrown 9951f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 9961f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 9971f68f0c4SNeilBrown sector_t first_bad; 9981f68f0c4SNeilBrown int bad_sectors; 9991f68f0c4SNeilBrown int is_bad; 10001f68f0c4SNeilBrown 10011f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 10021f68f0c4SNeilBrown max_sectors, 10031f68f0c4SNeilBrown &first_bad, &bad_sectors); 10041f68f0c4SNeilBrown if (is_bad < 0) { 10051f68f0c4SNeilBrown /* mustn't write here until the bad block is 10061f68f0c4SNeilBrown * acknowledged*/ 10071f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 10081f68f0c4SNeilBrown blocked_rdev = rdev; 10091f68f0c4SNeilBrown break; 10101f68f0c4SNeilBrown } 10111f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 10121f68f0c4SNeilBrown /* Cannot write here at all */ 10131f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 10141f68f0c4SNeilBrown if (bad_sectors < max_sectors) 10151f68f0c4SNeilBrown /* mustn't write more than bad_sectors 10161f68f0c4SNeilBrown * to other devices yet 10171f68f0c4SNeilBrown */ 10181f68f0c4SNeilBrown max_sectors = bad_sectors; 10191f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 10201f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 10211f68f0c4SNeilBrown * only applies if the disk is 10221f68f0c4SNeilBrown * missing, so it might be re-added, 10231f68f0c4SNeilBrown * and we want to know to recover this 10241f68f0c4SNeilBrown * chunk. 10251f68f0c4SNeilBrown * In this case the device is here, 10261f68f0c4SNeilBrown * and the fact that this chunk is not 10271f68f0c4SNeilBrown * in-sync is recorded in the bad 10281f68f0c4SNeilBrown * block log 10291f68f0c4SNeilBrown */ 10301f68f0c4SNeilBrown continue; 10311f68f0c4SNeilBrown } 10321f68f0c4SNeilBrown if (is_bad) { 10331f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 10341f68f0c4SNeilBrown if (good_sectors < max_sectors) 10351f68f0c4SNeilBrown max_sectors = good_sectors; 10361f68f0c4SNeilBrown } 10371f68f0c4SNeilBrown } 10381f68f0c4SNeilBrown r1_bio->bios[i] = bio; 10391da177e4SLinus Torvalds } 10401da177e4SLinus Torvalds rcu_read_unlock(); 10411da177e4SLinus Torvalds 10426bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 10436bfe0b49SDan Williams /* Wait for this device to become unblocked */ 10446bfe0b49SDan Williams int j; 10456bfe0b49SDan Williams 10466bfe0b49SDan Williams for (j = 0; j < i; j++) 10476bfe0b49SDan Williams if (r1_bio->bios[j]) 10486bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 10491f68f0c4SNeilBrown r1_bio->state = 0; 10506bfe0b49SDan Williams allow_barrier(conf); 10516bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 10526bfe0b49SDan Williams wait_barrier(conf); 10536bfe0b49SDan Williams goto retry_write; 10546bfe0b49SDan Williams } 10556bfe0b49SDan Williams 10561f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 10571f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 10581f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 10591f68f0c4SNeilBrown */ 10601f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 10611f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 10621f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 10631f68f0c4SNeilBrown bio->bi_phys_segments = 2; 10641f68f0c4SNeilBrown else 10651f68f0c4SNeilBrown bio->bi_phys_segments++; 10661f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1067191ea9b2SNeilBrown } 10681f68f0c4SNeilBrown sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; 10694b6d287fSNeilBrown 10704e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 10714b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1072191ea9b2SNeilBrown 10731f68f0c4SNeilBrown first_clone = 1; 10741da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 10751da177e4SLinus Torvalds struct bio *mbio; 10761da177e4SLinus Torvalds if (!r1_bio->bios[i]) 10771da177e4SLinus Torvalds continue; 10781da177e4SLinus Torvalds 1079a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 10801f68f0c4SNeilBrown md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); 10811da177e4SLinus Torvalds 10821f68f0c4SNeilBrown if (first_clone) { 10831f68f0c4SNeilBrown /* do behind I/O ? 10841f68f0c4SNeilBrown * Not if there are too many, or cannot 10851f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 10861f68f0c4SNeilBrown * is waiting for behind writes to flush */ 10871f68f0c4SNeilBrown if (bitmap && 10881f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 10891f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 10901f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 10911f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 10921da177e4SLinus Torvalds 10931f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 10941f68f0c4SNeilBrown r1_bio->sectors, 10951f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 10961f68f0c4SNeilBrown &r1_bio->state)); 10971f68f0c4SNeilBrown first_clone = 0; 10981f68f0c4SNeilBrown } 10992ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 11004b6d287fSNeilBrown struct bio_vec *bvec; 11014b6d287fSNeilBrown int j; 11024b6d287fSNeilBrown 11034b6d287fSNeilBrown /* Yes, I really want the '__' version so that 11044b6d287fSNeilBrown * we clear any unused pointer in the io_vec, rather 11054b6d287fSNeilBrown * than leave them unchanged. This is important 11064b6d287fSNeilBrown * because when we come to free the pages, we won't 1107046abeedSNeilBrown * know the original bi_idx, so we just free 11084b6d287fSNeilBrown * them all 11094b6d287fSNeilBrown */ 11104b6d287fSNeilBrown __bio_for_each_segment(bvec, mbio, j, 0) 11112ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 11124b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 11134b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 11144b6d287fSNeilBrown } 11154b6d287fSNeilBrown 11161f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 11171f68f0c4SNeilBrown 11181f68f0c4SNeilBrown mbio->bi_sector = (r1_bio->sector + 11191f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 11201f68f0c4SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 11211f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 11221f68f0c4SNeilBrown mbio->bi_rw = WRITE | do_flush_fua | do_sync; 11231f68f0c4SNeilBrown mbio->bi_private = r1_bio; 11241f68f0c4SNeilBrown 11251da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1126191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 11274e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 112834db0cd6SNeilBrown conf->pending_count++; 1129191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 11304e78064fSNeilBrown } 1131079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1132079fa166SNeilBrown * as it could result in the bio being freed. 1133079fa166SNeilBrown */ 11341f68f0c4SNeilBrown if (sectors_handled < (bio->bi_size >> 9)) { 1135079fa166SNeilBrown r1_bio_write_done(r1_bio); 11361f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 11371f68f0c4SNeilBrown * in bio->bi_phys_segments 11381f68f0c4SNeilBrown */ 11391f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 11401f68f0c4SNeilBrown r1_bio->master_bio = bio; 11411f68f0c4SNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 11421f68f0c4SNeilBrown r1_bio->state = 0; 11431f68f0c4SNeilBrown r1_bio->mddev = mddev; 11441f68f0c4SNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 11451f68f0c4SNeilBrown goto retry_write; 11461f68f0c4SNeilBrown } 11471f68f0c4SNeilBrown 1148079fa166SNeilBrown r1_bio_write_done(r1_bio); 1149079fa166SNeilBrown 1150079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1151079fa166SNeilBrown wake_up(&conf->wait_barrier); 1152079fa166SNeilBrown 1153c3b328acSNeilBrown if (do_sync || !bitmap || !plugged) 1154e3881a68SLars Ellenberg md_wakeup_thread(mddev->thread); 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds return 0; 11571da177e4SLinus Torvalds } 11581da177e4SLinus Torvalds 1159fd01b88cSNeilBrown static void status(struct seq_file *seq, struct mddev *mddev) 11601da177e4SLinus Torvalds { 1161e8096360SNeilBrown struct r1conf *conf = mddev->private; 11621da177e4SLinus Torvalds int i; 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 116511ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1166ddac7c7eSNeilBrown rcu_read_lock(); 1167ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 11683cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 11691da177e4SLinus Torvalds seq_printf(seq, "%s", 1170ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1171ddac7c7eSNeilBrown } 1172ddac7c7eSNeilBrown rcu_read_unlock(); 11731da177e4SLinus Torvalds seq_printf(seq, "]"); 11741da177e4SLinus Torvalds } 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds 1177fd01b88cSNeilBrown static void error(struct mddev *mddev, struct md_rdev *rdev) 11781da177e4SLinus Torvalds { 11791da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1180e8096360SNeilBrown struct r1conf *conf = mddev->private; 11811da177e4SLinus Torvalds 11821da177e4SLinus Torvalds /* 11831da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 11841da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 11851da177e4SLinus Torvalds * next level up know. 11861da177e4SLinus Torvalds * else mark the drive as failed 11871da177e4SLinus Torvalds */ 1188b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 11894044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 11901da177e4SLinus Torvalds /* 11911da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 11924044ba58SNeilBrown * normal single drive. 11934044ba58SNeilBrown * However don't try a recovery from this drive as 11944044ba58SNeilBrown * it is very likely to fail. 11951da177e4SLinus Torvalds */ 11965389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 11971da177e4SLinus Torvalds return; 11984044ba58SNeilBrown } 1199de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1200c04be0aaSNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 1201c04be0aaSNeilBrown unsigned long flags; 1202c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 12031da177e4SLinus Torvalds mddev->degraded++; 1204dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1205c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 12061da177e4SLinus Torvalds /* 12071da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 12081da177e4SLinus Torvalds */ 1209dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1210dd00a99eSNeilBrown } else 1211b2d444d7SNeilBrown set_bit(Faulty, &rdev->flags); 1212850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 1213067032bcSJoe Perches printk(KERN_ALERT 1214067032bcSJoe Perches "md/raid1:%s: Disk failure on %s, disabling device.\n" 1215067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 12169dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 12179dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 12181da177e4SLinus Torvalds } 12191da177e4SLinus Torvalds 1220e8096360SNeilBrown static void print_conf(struct r1conf *conf) 12211da177e4SLinus Torvalds { 12221da177e4SLinus Torvalds int i; 12231da177e4SLinus Torvalds 12249dd1e2faSNeilBrown printk(KERN_DEBUG "RAID1 conf printout:\n"); 12251da177e4SLinus Torvalds if (!conf) { 12269dd1e2faSNeilBrown printk(KERN_DEBUG "(!conf)\n"); 12271da177e4SLinus Torvalds return; 12281da177e4SLinus Torvalds } 12299dd1e2faSNeilBrown printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 12301da177e4SLinus Torvalds conf->raid_disks); 12311da177e4SLinus Torvalds 1232ddac7c7eSNeilBrown rcu_read_lock(); 12331da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 12341da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 12353cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1236ddac7c7eSNeilBrown if (rdev) 12379dd1e2faSNeilBrown printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", 1238ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1239ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1240ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 12411da177e4SLinus Torvalds } 1242ddac7c7eSNeilBrown rcu_read_unlock(); 12431da177e4SLinus Torvalds } 12441da177e4SLinus Torvalds 1245e8096360SNeilBrown static void close_sync(struct r1conf *conf) 12461da177e4SLinus Torvalds { 124717999be4SNeilBrown wait_barrier(conf); 124817999be4SNeilBrown allow_barrier(conf); 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 12511da177e4SLinus Torvalds conf->r1buf_pool = NULL; 12521da177e4SLinus Torvalds } 12531da177e4SLinus Torvalds 1254fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 12551da177e4SLinus Torvalds { 12561da177e4SLinus Torvalds int i; 1257e8096360SNeilBrown struct r1conf *conf = mddev->private; 12586b965620SNeilBrown int count = 0; 12596b965620SNeilBrown unsigned long flags; 12601da177e4SLinus Torvalds 12611da177e4SLinus Torvalds /* 12621da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1263ddac7c7eSNeilBrown * and mark them readable. 1264ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 12651da177e4SLinus Torvalds */ 12661da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 12673cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 1268ddac7c7eSNeilBrown if (rdev 1269ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1270c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 12716b965620SNeilBrown count++; 1272654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds } 12756b965620SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 12766b965620SNeilBrown mddev->degraded -= count; 12776b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 12781da177e4SLinus Torvalds 12791da177e4SLinus Torvalds print_conf(conf); 12806b965620SNeilBrown return count; 12811da177e4SLinus Torvalds } 12821da177e4SLinus Torvalds 12831da177e4SLinus Torvalds 1284fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 12851da177e4SLinus Torvalds { 1286e8096360SNeilBrown struct r1conf *conf = mddev->private; 1287199050eaSNeil Brown int err = -EEXIST; 128841158c7eSNeilBrown int mirror = 0; 12890f6d02d5SNeilBrown struct mirror_info *p; 12906c2fce2eSNeil Brown int first = 0; 12916c2fce2eSNeil Brown int last = mddev->raid_disks - 1; 12921da177e4SLinus Torvalds 12935389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 12945389042fSNeilBrown return -EBUSY; 12955389042fSNeilBrown 12966c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 12976c2fce2eSNeil Brown first = last = rdev->raid_disk; 12986c2fce2eSNeil Brown 12996c2fce2eSNeil Brown for (mirror = first; mirror <= last; mirror++) 13001da177e4SLinus Torvalds if ( !(p=conf->mirrors+mirror)->rdev) { 13011da177e4SLinus Torvalds 13028f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 13038f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 1304627a2d3cSNeilBrown /* as we don't honour merge_bvec_fn, we must 1305627a2d3cSNeilBrown * never risk violating it, so limit 1306627a2d3cSNeilBrown * ->max_segments to one lying with a single 1307627a2d3cSNeilBrown * page, as a one page request is never in 1308627a2d3cSNeilBrown * violation. 13091da177e4SLinus Torvalds */ 1310627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 1311627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 1312627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 1313627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 1314627a2d3cSNeilBrown } 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds p->head_position = 0; 13171da177e4SLinus Torvalds rdev->raid_disk = mirror; 1318199050eaSNeil Brown err = 0; 13196aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 13206aea114aSNeilBrown * if this was recently any drive of the array 13216aea114aSNeilBrown */ 13226aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 132341158c7eSNeilBrown conf->fullsync = 1; 1324d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 13251da177e4SLinus Torvalds break; 13261da177e4SLinus Torvalds } 1327ac5e7113SAndre Noll md_integrity_add_rdev(rdev, mddev); 13281da177e4SLinus Torvalds print_conf(conf); 1329199050eaSNeil Brown return err; 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds 1332fd01b88cSNeilBrown static int raid1_remove_disk(struct mddev *mddev, int number) 13331da177e4SLinus Torvalds { 1334e8096360SNeilBrown struct r1conf *conf = mddev->private; 13351da177e4SLinus Torvalds int err = 0; 13363cb03002SNeilBrown struct md_rdev *rdev; 13370f6d02d5SNeilBrown struct mirror_info *p = conf->mirrors+ number; 13381da177e4SLinus Torvalds 13391da177e4SLinus Torvalds print_conf(conf); 13401da177e4SLinus Torvalds rdev = p->rdev; 13411da177e4SLinus Torvalds if (rdev) { 1342b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 13431da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 13441da177e4SLinus Torvalds err = -EBUSY; 13451da177e4SLinus Torvalds goto abort; 13461da177e4SLinus Torvalds } 1347046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1348dfc70645SNeilBrown * is not possible. 1349dfc70645SNeilBrown */ 1350dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 13515389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1352dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1353dfc70645SNeilBrown err = -EBUSY; 1354dfc70645SNeilBrown goto abort; 1355dfc70645SNeilBrown } 13561da177e4SLinus Torvalds p->rdev = NULL; 1357fbd568a3SPaul E. McKenney synchronize_rcu(); 13581da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 13591da177e4SLinus Torvalds /* lost the race, try later */ 13601da177e4SLinus Torvalds err = -EBUSY; 13611da177e4SLinus Torvalds p->rdev = rdev; 1362ac5e7113SAndre Noll goto abort; 13631da177e4SLinus Torvalds } 1364a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 13651da177e4SLinus Torvalds } 13661da177e4SLinus Torvalds abort: 13671da177e4SLinus Torvalds 13681da177e4SLinus Torvalds print_conf(conf); 13691da177e4SLinus Torvalds return err; 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds 13736712ecf8SNeilBrown static void end_sync_read(struct bio *bio, int error) 13741da177e4SLinus Torvalds { 13759f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 13761da177e4SLinus Torvalds 13770fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1378ba3ae3beSNamhyung Kim 13791da177e4SLinus Torvalds /* 13801da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 13811da177e4SLinus Torvalds * or re-read if the read failed. 13821da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 13831da177e4SLinus Torvalds */ 138469382e85SNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags)) 13851da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1386d11c171eSNeilBrown 1387d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 13881da177e4SLinus Torvalds reschedule_retry(r1_bio); 13891da177e4SLinus Torvalds } 13901da177e4SLinus Torvalds 13916712ecf8SNeilBrown static void end_sync_write(struct bio *bio, int error) 13921da177e4SLinus Torvalds { 13931da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 13949f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1395fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1396e8096360SNeilBrown struct r1conf *conf = mddev->private; 13971da177e4SLinus Torvalds int mirror=0; 13984367af55SNeilBrown sector_t first_bad; 13994367af55SNeilBrown int bad_sectors; 14001da177e4SLinus Torvalds 1401ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 1402ba3ae3beSNamhyung Kim 14036b1117d5SNeilBrown if (!uptodate) { 140457dab0bdSNeilBrown sector_t sync_blocks = 0; 14056b1117d5SNeilBrown sector_t s = r1_bio->sector; 14066b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 14076b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 14086b1117d5SNeilBrown do { 14095e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 14106b1117d5SNeilBrown &sync_blocks, 1); 14116b1117d5SNeilBrown s += sync_blocks; 14126b1117d5SNeilBrown sectors_to_go -= sync_blocks; 14136b1117d5SNeilBrown } while (sectors_to_go > 0); 1414d8f05d29SNeilBrown set_bit(WriteErrorSeen, 1415d8f05d29SNeilBrown &conf->mirrors[mirror].rdev->flags); 1416d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 14174367af55SNeilBrown } else if (is_badblock(conf->mirrors[mirror].rdev, 14184367af55SNeilBrown r1_bio->sector, 14194367af55SNeilBrown r1_bio->sectors, 14203a9f28a5SNeilBrown &first_bad, &bad_sectors) && 14213a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 14223a9f28a5SNeilBrown r1_bio->sector, 14233a9f28a5SNeilBrown r1_bio->sectors, 14243a9f28a5SNeilBrown &first_bad, &bad_sectors) 14253a9f28a5SNeilBrown ) 14264367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1427e3b9703eSNeilBrown 14281da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 14294367af55SNeilBrown int s = r1_bio->sectors; 1430d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1431d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 14324367af55SNeilBrown reschedule_retry(r1_bio); 14334367af55SNeilBrown else { 14341da177e4SLinus Torvalds put_buf(r1_bio); 143573d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds } 14384367af55SNeilBrown } 14391da177e4SLinus Torvalds 14403cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1441d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1442d8f05d29SNeilBrown { 1443d8f05d29SNeilBrown if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1444d8f05d29SNeilBrown /* success */ 1445d8f05d29SNeilBrown return 1; 1446d8f05d29SNeilBrown if (rw == WRITE) 1447d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1448d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1449d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1450d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1451d8f05d29SNeilBrown return 0; 1452d8f05d29SNeilBrown } 1453d8f05d29SNeilBrown 14549f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 14551da177e4SLinus Torvalds { 1456a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 145769382e85SNeilBrown * good data, much like with normal read errors. Only 1458ddac7c7eSNeilBrown * read into the pages we already have so we don't 145969382e85SNeilBrown * need to re-issue the read request. 146069382e85SNeilBrown * We don't need to freeze the array, because being in an 146169382e85SNeilBrown * active sync request, there is no normal IO, and 146269382e85SNeilBrown * no overlapping syncs. 146306f60385SNeilBrown * We don't need to check is_badblock() again as we 146406f60385SNeilBrown * made sure that anything with a bad block in range 146506f60385SNeilBrown * will have bi_end_io clear. 14661da177e4SLinus Torvalds */ 1467fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1468e8096360SNeilBrown struct r1conf *conf = mddev->private; 1469a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 147069382e85SNeilBrown sector_t sect = r1_bio->sector; 147169382e85SNeilBrown int sectors = r1_bio->sectors; 147269382e85SNeilBrown int idx = 0; 147369382e85SNeilBrown 147469382e85SNeilBrown while(sectors) { 147569382e85SNeilBrown int s = sectors; 147669382e85SNeilBrown int d = r1_bio->read_disk; 147769382e85SNeilBrown int success = 0; 14783cb03002SNeilBrown struct md_rdev *rdev; 147978d7f5f7SNeilBrown int start; 148069382e85SNeilBrown 148169382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 148269382e85SNeilBrown s = PAGE_SIZE >> 9; 148369382e85SNeilBrown do { 148469382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1485ddac7c7eSNeilBrown /* No rcu protection needed here devices 1486ddac7c7eSNeilBrown * can only be removed when no resync is 1487ddac7c7eSNeilBrown * active, and resync is currently active 1488ddac7c7eSNeilBrown */ 148969382e85SNeilBrown rdev = conf->mirrors[d].rdev; 14909d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 149169382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1492ccebd4c4SJonathan Brassow READ, false)) { 149369382e85SNeilBrown success = 1; 149469382e85SNeilBrown break; 149569382e85SNeilBrown } 149669382e85SNeilBrown } 149769382e85SNeilBrown d++; 149869382e85SNeilBrown if (d == conf->raid_disks) 149969382e85SNeilBrown d = 0; 150069382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 150169382e85SNeilBrown 150278d7f5f7SNeilBrown if (!success) { 150378d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 15043a9f28a5SNeilBrown int abort = 0; 15053a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 15063a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 15073a9f28a5SNeilBrown * work just disable and interrupt the recovery. 15083a9f28a5SNeilBrown * Don't fail devices as that won't really help. 15093a9f28a5SNeilBrown */ 151078d7f5f7SNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" 151178d7f5f7SNeilBrown " for block %llu\n", 151278d7f5f7SNeilBrown mdname(mddev), 151378d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 151478d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 15153a9f28a5SNeilBrown for (d = 0; d < conf->raid_disks; d++) { 15163a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 15173a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 15183a9f28a5SNeilBrown continue; 15193a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 15203a9f28a5SNeilBrown abort = 1; 15213a9f28a5SNeilBrown } 15223a9f28a5SNeilBrown if (abort) { 1523d890fa2bSNeilBrown conf->recovery_disabled = 1524d890fa2bSNeilBrown mddev->recovery_disabled; 15253a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 152678d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 152778d7f5f7SNeilBrown put_buf(r1_bio); 152878d7f5f7SNeilBrown return 0; 152978d7f5f7SNeilBrown } 15303a9f28a5SNeilBrown /* Try next page */ 15313a9f28a5SNeilBrown sectors -= s; 15323a9f28a5SNeilBrown sect += s; 15333a9f28a5SNeilBrown idx++; 15343a9f28a5SNeilBrown continue; 15353a9f28a5SNeilBrown } 153678d7f5f7SNeilBrown 153778d7f5f7SNeilBrown start = d; 153869382e85SNeilBrown /* write it back and re-read */ 153969382e85SNeilBrown while (d != r1_bio->read_disk) { 154069382e85SNeilBrown if (d == 0) 154169382e85SNeilBrown d = conf->raid_disks; 154269382e85SNeilBrown d--; 154369382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 154469382e85SNeilBrown continue; 154569382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1546d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 154769382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1548d8f05d29SNeilBrown WRITE) == 0) { 154978d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 155078d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 15519d3d8011SNamhyung Kim } 1552097426f6SNeilBrown } 1553097426f6SNeilBrown d = start; 1554097426f6SNeilBrown while (d != r1_bio->read_disk) { 1555097426f6SNeilBrown if (d == 0) 1556097426f6SNeilBrown d = conf->raid_disks; 1557097426f6SNeilBrown d--; 1558097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1559097426f6SNeilBrown continue; 1560097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1561d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 156269382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1563d8f05d29SNeilBrown READ) != 0) 15649d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 156569382e85SNeilBrown } 156669382e85SNeilBrown sectors -= s; 156769382e85SNeilBrown sect += s; 156869382e85SNeilBrown idx ++; 156969382e85SNeilBrown } 157078d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 15717ca78d57SNeilBrown set_bit(BIO_UPTODATE, &bio->bi_flags); 1572a68e5870SNeilBrown return 1; 157369382e85SNeilBrown } 1574d11c171eSNeilBrown 15759f2c9d12SNeilBrown static int process_checks(struct r1bio *r1_bio) 1576a68e5870SNeilBrown { 1577a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1578a68e5870SNeilBrown * got the block, then there is no hope left. 1579a68e5870SNeilBrown * If we have, then we want to do a comparison 1580a68e5870SNeilBrown * and skip the write if everything is the same. 1581a68e5870SNeilBrown * If any blocks failed to read, then we need to 1582a68e5870SNeilBrown * attempt an over-write 1583a68e5870SNeilBrown */ 1584fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1585e8096360SNeilBrown struct r1conf *conf = mddev->private; 1586a68e5870SNeilBrown int primary; 1587a68e5870SNeilBrown int i; 1588a68e5870SNeilBrown 158978d7f5f7SNeilBrown for (primary = 0; primary < conf->raid_disks; primary++) 1590a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 1591a68e5870SNeilBrown test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { 1592a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1593a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1594a68e5870SNeilBrown break; 1595a68e5870SNeilBrown } 1596a68e5870SNeilBrown r1_bio->read_disk = primary; 159778d7f5f7SNeilBrown for (i = 0; i < conf->raid_disks; i++) { 1598a68e5870SNeilBrown int j; 1599a68e5870SNeilBrown int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); 1600a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1601a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 160278d7f5f7SNeilBrown int size; 160378d7f5f7SNeilBrown 160478d7f5f7SNeilBrown if (r1_bio->bios[i]->bi_end_io != end_sync_read) 160578d7f5f7SNeilBrown continue; 1606a68e5870SNeilBrown 1607a68e5870SNeilBrown if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { 1608a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1609a68e5870SNeilBrown struct page *p, *s; 1610a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1611a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1612a68e5870SNeilBrown if (memcmp(page_address(p), 1613a68e5870SNeilBrown page_address(s), 1614a68e5870SNeilBrown PAGE_SIZE)) 1615a68e5870SNeilBrown break; 1616a68e5870SNeilBrown } 1617a68e5870SNeilBrown } else 1618a68e5870SNeilBrown j = 0; 1619a68e5870SNeilBrown if (j >= 0) 1620a68e5870SNeilBrown mddev->resync_mismatches += r1_bio->sectors; 1621a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 1622a68e5870SNeilBrown && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { 162378d7f5f7SNeilBrown /* No need to write to this device. */ 1624a68e5870SNeilBrown sbio->bi_end_io = NULL; 1625a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 162678d7f5f7SNeilBrown continue; 162778d7f5f7SNeilBrown } 1628a68e5870SNeilBrown /* fixup the bio for reuse */ 1629a68e5870SNeilBrown sbio->bi_vcnt = vcnt; 1630a68e5870SNeilBrown sbio->bi_size = r1_bio->sectors << 9; 1631a68e5870SNeilBrown sbio->bi_idx = 0; 1632a68e5870SNeilBrown sbio->bi_phys_segments = 0; 1633a68e5870SNeilBrown sbio->bi_flags &= ~(BIO_POOL_MASK - 1); 1634a68e5870SNeilBrown sbio->bi_flags |= 1 << BIO_UPTODATE; 1635a68e5870SNeilBrown sbio->bi_next = NULL; 1636a68e5870SNeilBrown sbio->bi_sector = r1_bio->sector + 1637a68e5870SNeilBrown conf->mirrors[i].rdev->data_offset; 1638a68e5870SNeilBrown sbio->bi_bdev = conf->mirrors[i].rdev->bdev; 1639a68e5870SNeilBrown size = sbio->bi_size; 1640a68e5870SNeilBrown for (j = 0; j < vcnt ; j++) { 1641a68e5870SNeilBrown struct bio_vec *bi; 1642a68e5870SNeilBrown bi = &sbio->bi_io_vec[j]; 1643a68e5870SNeilBrown bi->bv_offset = 0; 1644a68e5870SNeilBrown if (size > PAGE_SIZE) 1645a68e5870SNeilBrown bi->bv_len = PAGE_SIZE; 1646a68e5870SNeilBrown else 1647a68e5870SNeilBrown bi->bv_len = size; 1648a68e5870SNeilBrown size -= PAGE_SIZE; 1649a68e5870SNeilBrown memcpy(page_address(bi->bv_page), 1650a68e5870SNeilBrown page_address(pbio->bi_io_vec[j].bv_page), 1651a68e5870SNeilBrown PAGE_SIZE); 1652a68e5870SNeilBrown } 1653a68e5870SNeilBrown } 1654a68e5870SNeilBrown return 0; 1655a68e5870SNeilBrown } 1656a68e5870SNeilBrown 16579f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 1658a68e5870SNeilBrown { 1659e8096360SNeilBrown struct r1conf *conf = mddev->private; 1660a68e5870SNeilBrown int i; 1661a68e5870SNeilBrown int disks = conf->raid_disks; 1662a68e5870SNeilBrown struct bio *bio, *wbio; 1663a68e5870SNeilBrown 1664a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 1665a68e5870SNeilBrown 1666a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 1667a68e5870SNeilBrown /* ouch - failed to read all of that. */ 1668a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 1669a68e5870SNeilBrown return; 16707ca78d57SNeilBrown 16717ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 16727ca78d57SNeilBrown if (process_checks(r1_bio) < 0) 16737ca78d57SNeilBrown return; 1674d11c171eSNeilBrown /* 1675d11c171eSNeilBrown * schedule writes 1676d11c171eSNeilBrown */ 16771da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 16781da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 16791da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 16803e198f78SNeilBrown if (wbio->bi_end_io == NULL || 16813e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 16823e198f78SNeilBrown (i == r1_bio->read_disk || 16833e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 16841da177e4SLinus Torvalds continue; 16851da177e4SLinus Torvalds 16863e198f78SNeilBrown wbio->bi_rw = WRITE; 16873e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 16881da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 16891da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 1690191ea9b2SNeilBrown 16911da177e4SLinus Torvalds generic_make_request(wbio); 16921da177e4SLinus Torvalds } 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 1695191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 16961da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 1); 16971da177e4SLinus Torvalds put_buf(r1_bio); 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds } 17001da177e4SLinus Torvalds 17011da177e4SLinus Torvalds /* 17021da177e4SLinus Torvalds * This is a kernel thread which: 17031da177e4SLinus Torvalds * 17041da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 17051da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 1706d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 17071da177e4SLinus Torvalds */ 17081da177e4SLinus Torvalds 1709e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 1710867868fbSNeilBrown sector_t sect, int sectors) 1711867868fbSNeilBrown { 1712fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 1713867868fbSNeilBrown while(sectors) { 1714867868fbSNeilBrown int s = sectors; 1715867868fbSNeilBrown int d = read_disk; 1716867868fbSNeilBrown int success = 0; 1717867868fbSNeilBrown int start; 17183cb03002SNeilBrown struct md_rdev *rdev; 1719867868fbSNeilBrown 1720867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 1721867868fbSNeilBrown s = PAGE_SIZE >> 9; 1722867868fbSNeilBrown 1723867868fbSNeilBrown do { 1724867868fbSNeilBrown /* Note: no rcu protection needed here 1725867868fbSNeilBrown * as this is synchronous in the raid1d thread 1726867868fbSNeilBrown * which is the thread that might remove 1727867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 1728867868fbSNeilBrown */ 1729d2eb35acSNeilBrown sector_t first_bad; 1730d2eb35acSNeilBrown int bad_sectors; 1731d2eb35acSNeilBrown 1732867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1733867868fbSNeilBrown if (rdev && 1734867868fbSNeilBrown test_bit(In_sync, &rdev->flags) && 1735d2eb35acSNeilBrown is_badblock(rdev, sect, s, 1736d2eb35acSNeilBrown &first_bad, &bad_sectors) == 0 && 1737ccebd4c4SJonathan Brassow sync_page_io(rdev, sect, s<<9, 1738ccebd4c4SJonathan Brassow conf->tmppage, READ, false)) 1739867868fbSNeilBrown success = 1; 1740867868fbSNeilBrown else { 1741867868fbSNeilBrown d++; 1742867868fbSNeilBrown if (d == conf->raid_disks) 1743867868fbSNeilBrown d = 0; 1744867868fbSNeilBrown } 1745867868fbSNeilBrown } while (!success && d != read_disk); 1746867868fbSNeilBrown 1747867868fbSNeilBrown if (!success) { 1748d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 17493cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 1750d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 1751d8f05d29SNeilBrown md_error(mddev, rdev); 1752867868fbSNeilBrown break; 1753867868fbSNeilBrown } 1754867868fbSNeilBrown /* write it back and re-read */ 1755867868fbSNeilBrown start = d; 1756867868fbSNeilBrown while (d != read_disk) { 1757867868fbSNeilBrown if (d==0) 1758867868fbSNeilBrown d = conf->raid_disks; 1759867868fbSNeilBrown d--; 1760867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1761867868fbSNeilBrown if (rdev && 1762d8f05d29SNeilBrown test_bit(In_sync, &rdev->flags)) 1763d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 1764d8f05d29SNeilBrown conf->tmppage, WRITE); 1765867868fbSNeilBrown } 1766867868fbSNeilBrown d = start; 1767867868fbSNeilBrown while (d != read_disk) { 1768867868fbSNeilBrown char b[BDEVNAME_SIZE]; 1769867868fbSNeilBrown if (d==0) 1770867868fbSNeilBrown d = conf->raid_disks; 1771867868fbSNeilBrown d--; 1772867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1773867868fbSNeilBrown if (rdev && 1774867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1775d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 1776d8f05d29SNeilBrown conf->tmppage, READ)) { 1777867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 1778867868fbSNeilBrown printk(KERN_INFO 17799dd1e2faSNeilBrown "md/raid1:%s: read error corrected " 1780867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 1781867868fbSNeilBrown mdname(mddev), s, 1782969b755aSRandy Dunlap (unsigned long long)(sect + 1783969b755aSRandy Dunlap rdev->data_offset), 1784867868fbSNeilBrown bdevname(rdev->bdev, b)); 1785867868fbSNeilBrown } 1786867868fbSNeilBrown } 1787867868fbSNeilBrown } 1788867868fbSNeilBrown sectors -= s; 1789867868fbSNeilBrown sect += s; 1790867868fbSNeilBrown } 1791867868fbSNeilBrown } 1792867868fbSNeilBrown 1793cd5ff9a1SNeilBrown static void bi_complete(struct bio *bio, int error) 1794cd5ff9a1SNeilBrown { 1795cd5ff9a1SNeilBrown complete((struct completion *)bio->bi_private); 1796cd5ff9a1SNeilBrown } 1797cd5ff9a1SNeilBrown 1798cd5ff9a1SNeilBrown static int submit_bio_wait(int rw, struct bio *bio) 1799cd5ff9a1SNeilBrown { 1800cd5ff9a1SNeilBrown struct completion event; 1801cd5ff9a1SNeilBrown rw |= REQ_SYNC; 1802cd5ff9a1SNeilBrown 1803cd5ff9a1SNeilBrown init_completion(&event); 1804cd5ff9a1SNeilBrown bio->bi_private = &event; 1805cd5ff9a1SNeilBrown bio->bi_end_io = bi_complete; 1806cd5ff9a1SNeilBrown submit_bio(rw, bio); 1807cd5ff9a1SNeilBrown wait_for_completion(&event); 1808cd5ff9a1SNeilBrown 1809cd5ff9a1SNeilBrown return test_bit(BIO_UPTODATE, &bio->bi_flags); 1810cd5ff9a1SNeilBrown } 1811cd5ff9a1SNeilBrown 18129f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 1813cd5ff9a1SNeilBrown { 1814fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1815e8096360SNeilBrown struct r1conf *conf = mddev->private; 18163cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 1817cd5ff9a1SNeilBrown int vcnt, idx; 1818cd5ff9a1SNeilBrown struct bio_vec *vec; 1819cd5ff9a1SNeilBrown 1820cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 1821cd5ff9a1SNeilBrown * we just recently had a write error. 1822cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 1823cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 1824cd5ff9a1SNeilBrown * a bad block. 1825cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 1826cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 1827cd5ff9a1SNeilBrown * 1828cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 1829cd5ff9a1SNeilBrown */ 1830cd5ff9a1SNeilBrown 1831cd5ff9a1SNeilBrown int block_sectors; 1832cd5ff9a1SNeilBrown sector_t sector; 1833cd5ff9a1SNeilBrown int sectors; 1834cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 1835cd5ff9a1SNeilBrown int ok = 1; 1836cd5ff9a1SNeilBrown 1837cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 1838cd5ff9a1SNeilBrown return 0; 1839cd5ff9a1SNeilBrown 1840cd5ff9a1SNeilBrown block_sectors = 1 << rdev->badblocks.shift; 1841cd5ff9a1SNeilBrown sector = r1_bio->sector; 1842cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 1843cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 1844cd5ff9a1SNeilBrown - sector; 1845cd5ff9a1SNeilBrown 1846cd5ff9a1SNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 1847cd5ff9a1SNeilBrown vcnt = r1_bio->behind_page_count; 1848cd5ff9a1SNeilBrown vec = r1_bio->behind_bvecs; 1849cd5ff9a1SNeilBrown idx = 0; 1850cd5ff9a1SNeilBrown while (vec[idx].bv_page == NULL) 1851cd5ff9a1SNeilBrown idx++; 1852cd5ff9a1SNeilBrown } else { 1853cd5ff9a1SNeilBrown vcnt = r1_bio->master_bio->bi_vcnt; 1854cd5ff9a1SNeilBrown vec = r1_bio->master_bio->bi_io_vec; 1855cd5ff9a1SNeilBrown idx = r1_bio->master_bio->bi_idx; 1856cd5ff9a1SNeilBrown } 1857cd5ff9a1SNeilBrown while (sect_to_write) { 1858cd5ff9a1SNeilBrown struct bio *wbio; 1859cd5ff9a1SNeilBrown if (sectors > sect_to_write) 1860cd5ff9a1SNeilBrown sectors = sect_to_write; 1861cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 1862cd5ff9a1SNeilBrown 1863cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 1864cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 1865cd5ff9a1SNeilBrown wbio->bi_sector = r1_bio->sector; 1866cd5ff9a1SNeilBrown wbio->bi_rw = WRITE; 1867cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 1868cd5ff9a1SNeilBrown wbio->bi_size = r1_bio->sectors << 9; 1869cd5ff9a1SNeilBrown wbio->bi_idx = idx; 1870cd5ff9a1SNeilBrown 1871cd5ff9a1SNeilBrown md_trim_bio(wbio, sector - r1_bio->sector, sectors); 1872cd5ff9a1SNeilBrown wbio->bi_sector += rdev->data_offset; 1873cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 1874cd5ff9a1SNeilBrown if (submit_bio_wait(WRITE, wbio) == 0) 1875cd5ff9a1SNeilBrown /* failure! */ 1876cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 1877cd5ff9a1SNeilBrown sectors, 0) 1878cd5ff9a1SNeilBrown && ok; 1879cd5ff9a1SNeilBrown 1880cd5ff9a1SNeilBrown bio_put(wbio); 1881cd5ff9a1SNeilBrown sect_to_write -= sectors; 1882cd5ff9a1SNeilBrown sector += sectors; 1883cd5ff9a1SNeilBrown sectors = block_sectors; 1884cd5ff9a1SNeilBrown } 1885cd5ff9a1SNeilBrown return ok; 1886cd5ff9a1SNeilBrown } 1887cd5ff9a1SNeilBrown 1888e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 188962096bceSNeilBrown { 189062096bceSNeilBrown int m; 189162096bceSNeilBrown int s = r1_bio->sectors; 189262096bceSNeilBrown for (m = 0; m < conf->raid_disks ; m++) { 18933cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 189462096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 189562096bceSNeilBrown if (bio->bi_end_io == NULL) 189662096bceSNeilBrown continue; 189762096bceSNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags) && 189862096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 189962096bceSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s); 190062096bceSNeilBrown } 190162096bceSNeilBrown if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 190262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 190362096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 190462096bceSNeilBrown md_error(conf->mddev, rdev); 190562096bceSNeilBrown } 190662096bceSNeilBrown } 190762096bceSNeilBrown put_buf(r1_bio); 190862096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 190962096bceSNeilBrown } 191062096bceSNeilBrown 1911e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 191262096bceSNeilBrown { 191362096bceSNeilBrown int m; 191462096bceSNeilBrown for (m = 0; m < conf->raid_disks ; m++) 191562096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 19163cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 191762096bceSNeilBrown rdev_clear_badblocks(rdev, 191862096bceSNeilBrown r1_bio->sector, 191962096bceSNeilBrown r1_bio->sectors); 192062096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 192162096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 192262096bceSNeilBrown /* This drive got a write error. We need to 192362096bceSNeilBrown * narrow down and record precise write 192462096bceSNeilBrown * errors. 192562096bceSNeilBrown */ 192662096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 192762096bceSNeilBrown md_error(conf->mddev, 192862096bceSNeilBrown conf->mirrors[m].rdev); 192962096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 193062096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 193162096bceSNeilBrown } 193262096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 193362096bceSNeilBrown conf->mddev); 193462096bceSNeilBrown } 193562096bceSNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 193662096bceSNeilBrown close_write(r1_bio); 193762096bceSNeilBrown raid_end_bio_io(r1_bio); 193862096bceSNeilBrown } 193962096bceSNeilBrown 1940e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 194162096bceSNeilBrown { 194262096bceSNeilBrown int disk; 194362096bceSNeilBrown int max_sectors; 1944fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 194562096bceSNeilBrown struct bio *bio; 194662096bceSNeilBrown char b[BDEVNAME_SIZE]; 19473cb03002SNeilBrown struct md_rdev *rdev; 194862096bceSNeilBrown 194962096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 195062096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 195162096bceSNeilBrown * the block and we can fix it. 195262096bceSNeilBrown * We freeze all other IO, and try reading the block from 195362096bceSNeilBrown * other devices. When we find one, we re-write 195462096bceSNeilBrown * and check it that fixes the read error. 195562096bceSNeilBrown * This is all done synchronously while the array is 195662096bceSNeilBrown * frozen 195762096bceSNeilBrown */ 195862096bceSNeilBrown if (mddev->ro == 0) { 195962096bceSNeilBrown freeze_array(conf); 196062096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 196162096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 196262096bceSNeilBrown unfreeze_array(conf); 196362096bceSNeilBrown } else 196462096bceSNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 196562096bceSNeilBrown 196662096bceSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 196762096bceSNeilBrown bdevname(bio->bi_bdev, b); 196862096bceSNeilBrown read_more: 196962096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 197062096bceSNeilBrown if (disk == -1) { 197162096bceSNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" 197262096bceSNeilBrown " read error for block %llu\n", 197362096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 197462096bceSNeilBrown raid_end_bio_io(r1_bio); 197562096bceSNeilBrown } else { 197662096bceSNeilBrown const unsigned long do_sync 197762096bceSNeilBrown = r1_bio->master_bio->bi_rw & REQ_SYNC; 197862096bceSNeilBrown if (bio) { 197962096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = 198062096bceSNeilBrown mddev->ro ? IO_BLOCKED : NULL; 198162096bceSNeilBrown bio_put(bio); 198262096bceSNeilBrown } 198362096bceSNeilBrown r1_bio->read_disk = disk; 198462096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 198562096bceSNeilBrown md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); 198662096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 198762096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 198862096bceSNeilBrown printk_ratelimited(KERN_ERR 198962096bceSNeilBrown "md/raid1:%s: redirecting sector %llu" 199062096bceSNeilBrown " to other mirror: %s\n", 199162096bceSNeilBrown mdname(mddev), 199262096bceSNeilBrown (unsigned long long)r1_bio->sector, 199362096bceSNeilBrown bdevname(rdev->bdev, b)); 199462096bceSNeilBrown bio->bi_sector = r1_bio->sector + rdev->data_offset; 199562096bceSNeilBrown bio->bi_bdev = rdev->bdev; 199662096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 199762096bceSNeilBrown bio->bi_rw = READ | do_sync; 199862096bceSNeilBrown bio->bi_private = r1_bio; 199962096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 200062096bceSNeilBrown /* Drat - have to split this up more */ 200162096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 200262096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 200362096bceSNeilBrown - mbio->bi_sector); 200462096bceSNeilBrown r1_bio->sectors = max_sectors; 200562096bceSNeilBrown spin_lock_irq(&conf->device_lock); 200662096bceSNeilBrown if (mbio->bi_phys_segments == 0) 200762096bceSNeilBrown mbio->bi_phys_segments = 2; 200862096bceSNeilBrown else 200962096bceSNeilBrown mbio->bi_phys_segments++; 201062096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 201162096bceSNeilBrown generic_make_request(bio); 201262096bceSNeilBrown bio = NULL; 201362096bceSNeilBrown 201462096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 201562096bceSNeilBrown 201662096bceSNeilBrown r1_bio->master_bio = mbio; 201762096bceSNeilBrown r1_bio->sectors = (mbio->bi_size >> 9) 201862096bceSNeilBrown - sectors_handled; 201962096bceSNeilBrown r1_bio->state = 0; 202062096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 202162096bceSNeilBrown r1_bio->mddev = mddev; 202262096bceSNeilBrown r1_bio->sector = mbio->bi_sector + sectors_handled; 202362096bceSNeilBrown 202462096bceSNeilBrown goto read_more; 202562096bceSNeilBrown } else 202662096bceSNeilBrown generic_make_request(bio); 202762096bceSNeilBrown } 202862096bceSNeilBrown } 202962096bceSNeilBrown 2030fd01b88cSNeilBrown static void raid1d(struct mddev *mddev) 20311da177e4SLinus Torvalds { 20329f2c9d12SNeilBrown struct r1bio *r1_bio; 20331da177e4SLinus Torvalds unsigned long flags; 2034e8096360SNeilBrown struct r1conf *conf = mddev->private; 20351da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2036e1dfa0a2SNeilBrown struct blk_plug plug; 20371da177e4SLinus Torvalds 20381da177e4SLinus Torvalds md_check_recovery(mddev); 20391da177e4SLinus Torvalds 2040e1dfa0a2SNeilBrown blk_start_plug(&plug); 20411da177e4SLinus Torvalds for (;;) { 2042a35e63efSNeilBrown 2043c3b328acSNeilBrown if (atomic_read(&mddev->plug_cnt) == 0) 20447eaceaccSJens Axboe flush_pending_writes(conf); 2045a35e63efSNeilBrown 20461da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2047a35e63efSNeilBrown if (list_empty(head)) { 2048191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 20491da177e4SLinus Torvalds break; 2050a35e63efSNeilBrown } 20519f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 20521da177e4SLinus Torvalds list_del(head->prev); 2053ddaf22abSNeilBrown conf->nr_queued--; 20541da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds mddev = r1_bio->mddev; 2057070ec55dSNeilBrown conf = mddev->private; 20584367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2059d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 206062096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 206162096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 206262096bceSNeilBrown else 20631da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2064cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 206562096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 206662096bceSNeilBrown handle_write_finished(conf, r1_bio); 206762096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 206862096bceSNeilBrown handle_read_error(conf, r1_bio); 2069d2eb35acSNeilBrown else 2070d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2071d2eb35acSNeilBrown * context 2072d2eb35acSNeilBrown */ 2073d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 207462096bceSNeilBrown 20751d9d5241SNeilBrown cond_resched(); 2076de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2077de393cdeSNeilBrown md_check_recovery(mddev); 20781da177e4SLinus Torvalds } 2079e1dfa0a2SNeilBrown blk_finish_plug(&plug); 20801da177e4SLinus Torvalds } 20811da177e4SLinus Torvalds 20821da177e4SLinus Torvalds 2083e8096360SNeilBrown static int init_resync(struct r1conf *conf) 20841da177e4SLinus Torvalds { 20851da177e4SLinus Torvalds int buffs; 20861da177e4SLinus Torvalds 20871da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 20889e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 20891da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 20901da177e4SLinus Torvalds conf->poolinfo); 20911da177e4SLinus Torvalds if (!conf->r1buf_pool) 20921da177e4SLinus Torvalds return -ENOMEM; 20931da177e4SLinus Torvalds conf->next_resync = 0; 20941da177e4SLinus Torvalds return 0; 20951da177e4SLinus Torvalds } 20961da177e4SLinus Torvalds 20971da177e4SLinus Torvalds /* 20981da177e4SLinus Torvalds * perform a "sync" on one "block" 20991da177e4SLinus Torvalds * 21001da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 21011da177e4SLinus Torvalds * requests - conflict with active sync requests. 21021da177e4SLinus Torvalds * 21031da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 21041da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 21051da177e4SLinus Torvalds */ 21061da177e4SLinus Torvalds 2107fd01b88cSNeilBrown static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) 21081da177e4SLinus Torvalds { 2109e8096360SNeilBrown struct r1conf *conf = mddev->private; 21109f2c9d12SNeilBrown struct r1bio *r1_bio; 21111da177e4SLinus Torvalds struct bio *bio; 21121da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 21133e198f78SNeilBrown int disk = -1; 21141da177e4SLinus Torvalds int i; 21153e198f78SNeilBrown int wonly = -1; 21163e198f78SNeilBrown int write_targets = 0, read_targets = 0; 211757dab0bdSNeilBrown sector_t sync_blocks; 2118e3b9703eSNeilBrown int still_degraded = 0; 211906f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 212006f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 21211da177e4SLinus Torvalds 21221da177e4SLinus Torvalds if (!conf->r1buf_pool) 21231da177e4SLinus Torvalds if (init_resync(conf)) 212457afd89fSNeilBrown return 0; 21251da177e4SLinus Torvalds 212658c0fed4SAndre Noll max_sector = mddev->dev_sectors; 21271da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2128191ea9b2SNeilBrown /* If we aborted, we need to abort the 2129191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2130191ea9b2SNeilBrown * only be one in raid1 resync. 2131191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2132191ea9b2SNeilBrown */ 21336a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 21346a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2135191ea9b2SNeilBrown &sync_blocks, 1); 21366a806c51SNeilBrown else /* completed sync */ 2137191ea9b2SNeilBrown conf->fullsync = 0; 21386a806c51SNeilBrown 21396a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 21401da177e4SLinus Torvalds close_sync(conf); 21411da177e4SLinus Torvalds return 0; 21421da177e4SLinus Torvalds } 21431da177e4SLinus Torvalds 214407d84d10SNeilBrown if (mddev->bitmap == NULL && 214507d84d10SNeilBrown mddev->recovery_cp == MaxSector && 21466394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 214707d84d10SNeilBrown conf->fullsync == 0) { 214807d84d10SNeilBrown *skipped = 1; 214907d84d10SNeilBrown return max_sector - sector_nr; 215007d84d10SNeilBrown } 21516394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 21526394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 21536394cca5SNeilBrown */ 2154e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2155e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2156191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2157191ea9b2SNeilBrown *skipped = 1; 2158191ea9b2SNeilBrown return sync_blocks; 2159191ea9b2SNeilBrown } 21601da177e4SLinus Torvalds /* 216117999be4SNeilBrown * If there is non-resync activity waiting for a turn, 216217999be4SNeilBrown * and resync is going fast enough, 216317999be4SNeilBrown * then let it though before starting on this new sync request. 21641da177e4SLinus Torvalds */ 216517999be4SNeilBrown if (!go_faster && conf->nr_waiting) 21661da177e4SLinus Torvalds msleep_interruptible(1000); 216717999be4SNeilBrown 2168b47490c9SNeilBrown bitmap_cond_end_sync(mddev->bitmap, sector_nr); 21691c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 217017999be4SNeilBrown raise_barrier(conf); 217117999be4SNeilBrown 217217999be4SNeilBrown conf->next_resync = sector_nr; 21731da177e4SLinus Torvalds 21743e198f78SNeilBrown rcu_read_lock(); 21753e198f78SNeilBrown /* 21763e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 21773e198f78SNeilBrown * we might want to read from a different device. So we 21783e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 21793e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 21803e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 21813e198f78SNeilBrown * is OK. 21823e198f78SNeilBrown */ 21831da177e4SLinus Torvalds 21841da177e4SLinus Torvalds r1_bio->mddev = mddev; 21851da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2186191ea9b2SNeilBrown r1_bio->state = 0; 21871da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 21881da177e4SLinus Torvalds 21891da177e4SLinus Torvalds for (i=0; i < conf->raid_disks; i++) { 21903cb03002SNeilBrown struct md_rdev *rdev; 21911da177e4SLinus Torvalds bio = r1_bio->bios[i]; 21921da177e4SLinus Torvalds 21931da177e4SLinus Torvalds /* take from bio_init */ 21941da177e4SLinus Torvalds bio->bi_next = NULL; 2195db8d9d35SNeilBrown bio->bi_flags &= ~(BIO_POOL_MASK-1); 21961da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 2197db8d9d35SNeilBrown bio->bi_comp_cpu = -1; 2198802ba064SNeilBrown bio->bi_rw = READ; 21991da177e4SLinus Torvalds bio->bi_vcnt = 0; 22001da177e4SLinus Torvalds bio->bi_idx = 0; 22011da177e4SLinus Torvalds bio->bi_phys_segments = 0; 22021da177e4SLinus Torvalds bio->bi_size = 0; 22031da177e4SLinus Torvalds bio->bi_end_io = NULL; 22041da177e4SLinus Torvalds bio->bi_private = NULL; 22051da177e4SLinus Torvalds 22063e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 22073e198f78SNeilBrown if (rdev == NULL || 22083e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 2209e3b9703eSNeilBrown still_degraded = 1; 22103e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 22111da177e4SLinus Torvalds bio->bi_rw = WRITE; 22121da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 22131da177e4SLinus Torvalds write_targets ++; 22143e198f78SNeilBrown } else { 22153e198f78SNeilBrown /* may need to read from here */ 221606f60385SNeilBrown sector_t first_bad = MaxSector; 221706f60385SNeilBrown int bad_sectors; 221806f60385SNeilBrown 221906f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 222006f60385SNeilBrown &first_bad, &bad_sectors)) { 222106f60385SNeilBrown if (first_bad > sector_nr) 222206f60385SNeilBrown good_sectors = first_bad - sector_nr; 222306f60385SNeilBrown else { 222406f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 222506f60385SNeilBrown if (min_bad == 0 || 222606f60385SNeilBrown min_bad > bad_sectors) 222706f60385SNeilBrown min_bad = bad_sectors; 222806f60385SNeilBrown } 222906f60385SNeilBrown } 223006f60385SNeilBrown if (sector_nr < first_bad) { 22313e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 22323e198f78SNeilBrown if (wonly < 0) 22333e198f78SNeilBrown wonly = i; 22343e198f78SNeilBrown } else { 22353e198f78SNeilBrown if (disk < 0) 22363e198f78SNeilBrown disk = i; 22373e198f78SNeilBrown } 223806f60385SNeilBrown bio->bi_rw = READ; 223906f60385SNeilBrown bio->bi_end_io = end_sync_read; 22403e198f78SNeilBrown read_targets++; 22413e198f78SNeilBrown } 224206f60385SNeilBrown } 224306f60385SNeilBrown if (bio->bi_end_io) { 22443e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 22453e198f78SNeilBrown bio->bi_sector = sector_nr + rdev->data_offset; 22463e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 22471da177e4SLinus Torvalds bio->bi_private = r1_bio; 22481da177e4SLinus Torvalds } 224906f60385SNeilBrown } 22503e198f78SNeilBrown rcu_read_unlock(); 22513e198f78SNeilBrown if (disk < 0) 22523e198f78SNeilBrown disk = wonly; 22533e198f78SNeilBrown r1_bio->read_disk = disk; 2254191ea9b2SNeilBrown 225506f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 225606f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 225706f60385SNeilBrown * need to mark them bad on all write targets 225806f60385SNeilBrown */ 225906f60385SNeilBrown int ok = 1; 226006f60385SNeilBrown for (i = 0 ; i < conf->raid_disks ; i++) 226106f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 22623cb03002SNeilBrown struct md_rdev *rdev = 226306f60385SNeilBrown rcu_dereference(conf->mirrors[i].rdev); 226406f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 226506f60385SNeilBrown min_bad, 0 226606f60385SNeilBrown ) && ok; 226706f60385SNeilBrown } 226806f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 226906f60385SNeilBrown *skipped = 1; 227006f60385SNeilBrown put_buf(r1_bio); 227106f60385SNeilBrown 227206f60385SNeilBrown if (!ok) { 227306f60385SNeilBrown /* Cannot record the badblocks, so need to 227406f60385SNeilBrown * abort the resync. 227506f60385SNeilBrown * If there are multiple read targets, could just 227606f60385SNeilBrown * fail the really bad ones ??? 227706f60385SNeilBrown */ 227806f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 227906f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 228006f60385SNeilBrown return 0; 228106f60385SNeilBrown } else 228206f60385SNeilBrown return min_bad; 228306f60385SNeilBrown 228406f60385SNeilBrown } 228506f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 228606f60385SNeilBrown /* only resync enough to reach the next bad->good 228706f60385SNeilBrown * transition */ 228806f60385SNeilBrown good_sectors = min_bad; 228906f60385SNeilBrown } 229006f60385SNeilBrown 22913e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 22923e198f78SNeilBrown /* extra read targets are also write targets */ 22933e198f78SNeilBrown write_targets += read_targets-1; 22943e198f78SNeilBrown 22953e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 22961da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 22971da177e4SLinus Torvalds * drives must be failed - so we are finished 22981da177e4SLinus Torvalds */ 229957afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 230057afd89fSNeilBrown *skipped = 1; 23011da177e4SLinus Torvalds put_buf(r1_bio); 23021da177e4SLinus Torvalds return rv; 23031da177e4SLinus Torvalds } 23041da177e4SLinus Torvalds 2305c6207277SNeilBrown if (max_sector > mddev->resync_max) 2306c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 230706f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 230806f60385SNeilBrown max_sector = sector_nr + good_sectors; 23091da177e4SLinus Torvalds nr_sectors = 0; 2310289e99e8SNeilBrown sync_blocks = 0; 23111da177e4SLinus Torvalds do { 23121da177e4SLinus Torvalds struct page *page; 23131da177e4SLinus Torvalds int len = PAGE_SIZE; 23141da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 23151da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 23161da177e4SLinus Torvalds if (len == 0) 23171da177e4SLinus Torvalds break; 2318ab7a30c7SNeilBrown if (sync_blocks == 0) { 23196a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2320e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2321e5de485fSNeilBrown !conf->fullsync && 2322e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2323191ea9b2SNeilBrown break; 23249e77c485SEric Sesterhenn BUG_ON(sync_blocks < (PAGE_SIZE>>9)); 23257571ae88SNeilBrown if ((len >> 9) > sync_blocks) 23266a806c51SNeilBrown len = sync_blocks<<9; 2327ab7a30c7SNeilBrown } 2328191ea9b2SNeilBrown 23291da177e4SLinus Torvalds for (i=0 ; i < conf->raid_disks; i++) { 23301da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23311da177e4SLinus Torvalds if (bio->bi_end_io) { 2332d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 23331da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 23341da177e4SLinus Torvalds /* stop here */ 2335d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 23361da177e4SLinus Torvalds while (i > 0) { 23371da177e4SLinus Torvalds i--; 23381da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23396a806c51SNeilBrown if (bio->bi_end_io==NULL) 23406a806c51SNeilBrown continue; 23411da177e4SLinus Torvalds /* remove last page from this bio */ 23421da177e4SLinus Torvalds bio->bi_vcnt--; 23431da177e4SLinus Torvalds bio->bi_size -= len; 23441da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 23451da177e4SLinus Torvalds } 23461da177e4SLinus Torvalds goto bio_full; 23471da177e4SLinus Torvalds } 23481da177e4SLinus Torvalds } 23491da177e4SLinus Torvalds } 23501da177e4SLinus Torvalds nr_sectors += len>>9; 23511da177e4SLinus Torvalds sector_nr += len>>9; 2352191ea9b2SNeilBrown sync_blocks -= (len>>9); 23531da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 23541da177e4SLinus Torvalds bio_full: 23551da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 23561da177e4SLinus Torvalds 2357d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2358d11c171eSNeilBrown * compare 2359d11c171eSNeilBrown */ 2360d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2361d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 2362d11c171eSNeilBrown for (i=0; i<conf->raid_disks; i++) { 2363d11c171eSNeilBrown bio = r1_bio->bios[i]; 2364d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 2365ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 23661da177e4SLinus Torvalds generic_make_request(bio); 2367d11c171eSNeilBrown } 2368d11c171eSNeilBrown } 2369d11c171eSNeilBrown } else { 2370d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2371d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2372ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2373d11c171eSNeilBrown generic_make_request(bio); 2374d11c171eSNeilBrown 2375d11c171eSNeilBrown } 23761da177e4SLinus Torvalds return nr_sectors; 23771da177e4SLinus Torvalds } 23781da177e4SLinus Torvalds 2379fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 238080c3a6ceSDan Williams { 238180c3a6ceSDan Williams if (sectors) 238280c3a6ceSDan Williams return sectors; 238380c3a6ceSDan Williams 238480c3a6ceSDan Williams return mddev->dev_sectors; 238580c3a6ceSDan Williams } 238680c3a6ceSDan Williams 2387e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 23881da177e4SLinus Torvalds { 2389e8096360SNeilBrown struct r1conf *conf; 2390709ae487SNeilBrown int i; 23910f6d02d5SNeilBrown struct mirror_info *disk; 23923cb03002SNeilBrown struct md_rdev *rdev; 2393709ae487SNeilBrown int err = -ENOMEM; 23941da177e4SLinus Torvalds 2395e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 23961da177e4SLinus Torvalds if (!conf) 2397709ae487SNeilBrown goto abort; 23981da177e4SLinus Torvalds 23999ffae0cfSNeilBrown conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, 24001da177e4SLinus Torvalds GFP_KERNEL); 24011da177e4SLinus Torvalds if (!conf->mirrors) 2402709ae487SNeilBrown goto abort; 24031da177e4SLinus Torvalds 2404ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2405ddaf22abSNeilBrown if (!conf->tmppage) 2406709ae487SNeilBrown goto abort; 2407ddaf22abSNeilBrown 2408709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 24091da177e4SLinus Torvalds if (!conf->poolinfo) 2410709ae487SNeilBrown goto abort; 24111da177e4SLinus Torvalds conf->poolinfo->raid_disks = mddev->raid_disks; 24121da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 24131da177e4SLinus Torvalds r1bio_pool_free, 24141da177e4SLinus Torvalds conf->poolinfo); 24151da177e4SLinus Torvalds if (!conf->r1bio_pool) 2416709ae487SNeilBrown goto abort; 2417709ae487SNeilBrown 2418ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 24191da177e4SLinus Torvalds 2420e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2421159ec1fcSCheng Renquan list_for_each_entry(rdev, &mddev->disks, same_set) { 2422709ae487SNeilBrown int disk_idx = rdev->raid_disk; 24231da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 24241da177e4SLinus Torvalds || disk_idx < 0) 24251da177e4SLinus Torvalds continue; 24261da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds disk->rdev = rdev; 24291da177e4SLinus Torvalds 24301da177e4SLinus Torvalds disk->head_position = 0; 24311da177e4SLinus Torvalds } 24321da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 24331da177e4SLinus Torvalds conf->mddev = mddev; 24341da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 24351da177e4SLinus Torvalds 24361da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 243717999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 24381da177e4SLinus Torvalds 2439191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 244034db0cd6SNeilBrown conf->pending_count = 0; 2441d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2442191ea9b2SNeilBrown 2443709ae487SNeilBrown conf->last_used = -1; 24441da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 24451da177e4SLinus Torvalds 24461da177e4SLinus Torvalds disk = conf->mirrors + i; 24471da177e4SLinus Torvalds 24485fd6c1dcSNeilBrown if (!disk->rdev || 24495fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 24501da177e4SLinus Torvalds disk->head_position = 0; 2451918f0238SNeilBrown if (disk->rdev) 245217571284SNeilBrown conf->fullsync = 1; 2453709ae487SNeilBrown } else if (conf->last_used < 0) 2454709ae487SNeilBrown /* 2455709ae487SNeilBrown * The first working device is used as a 2456709ae487SNeilBrown * starting point to read balancing. 2457709ae487SNeilBrown */ 2458709ae487SNeilBrown conf->last_used = i; 24591da177e4SLinus Torvalds } 2460709ae487SNeilBrown 2461709ae487SNeilBrown err = -EIO; 2462709ae487SNeilBrown if (conf->last_used < 0) { 24639dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", 246411ce99e6SNeilBrown mdname(mddev)); 2465709ae487SNeilBrown goto abort; 246611ce99e6SNeilBrown } 2467709ae487SNeilBrown err = -ENOMEM; 2468709ae487SNeilBrown conf->thread = md_register_thread(raid1d, mddev, NULL); 2469709ae487SNeilBrown if (!conf->thread) { 24701da177e4SLinus Torvalds printk(KERN_ERR 24719dd1e2faSNeilBrown "md/raid1:%s: couldn't allocate thread\n", 24721da177e4SLinus Torvalds mdname(mddev)); 2473709ae487SNeilBrown goto abort; 24741da177e4SLinus Torvalds } 2475191ea9b2SNeilBrown 2476709ae487SNeilBrown return conf; 2477709ae487SNeilBrown 2478709ae487SNeilBrown abort: 2479709ae487SNeilBrown if (conf) { 2480709ae487SNeilBrown if (conf->r1bio_pool) 2481709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2482709ae487SNeilBrown kfree(conf->mirrors); 2483709ae487SNeilBrown safe_put_page(conf->tmppage); 2484709ae487SNeilBrown kfree(conf->poolinfo); 2485709ae487SNeilBrown kfree(conf); 2486709ae487SNeilBrown } 2487709ae487SNeilBrown return ERR_PTR(err); 2488709ae487SNeilBrown } 2489709ae487SNeilBrown 2490fd01b88cSNeilBrown static int run(struct mddev *mddev) 2491709ae487SNeilBrown { 2492e8096360SNeilBrown struct r1conf *conf; 2493709ae487SNeilBrown int i; 24943cb03002SNeilBrown struct md_rdev *rdev; 2495709ae487SNeilBrown 2496709ae487SNeilBrown if (mddev->level != 1) { 24979dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", 2498709ae487SNeilBrown mdname(mddev), mddev->level); 2499709ae487SNeilBrown return -EIO; 2500709ae487SNeilBrown } 2501709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 25029dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", 2503709ae487SNeilBrown mdname(mddev)); 2504709ae487SNeilBrown return -EIO; 2505709ae487SNeilBrown } 2506709ae487SNeilBrown /* 2507709ae487SNeilBrown * copy the already verified devices into our private RAID1 2508709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2509709ae487SNeilBrown * should be freed in stop()] 2510709ae487SNeilBrown */ 2511709ae487SNeilBrown if (mddev->private == NULL) 2512709ae487SNeilBrown conf = setup_conf(mddev); 2513709ae487SNeilBrown else 2514709ae487SNeilBrown conf = mddev->private; 2515709ae487SNeilBrown 2516709ae487SNeilBrown if (IS_ERR(conf)) 2517709ae487SNeilBrown return PTR_ERR(conf); 2518709ae487SNeilBrown 2519709ae487SNeilBrown list_for_each_entry(rdev, &mddev->disks, same_set) { 25201ed7242eSJonathan Brassow if (!mddev->gendisk) 25211ed7242eSJonathan Brassow continue; 2522709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2523709ae487SNeilBrown rdev->data_offset << 9); 2524709ae487SNeilBrown /* as we don't honour merge_bvec_fn, we must never risk 2525627a2d3cSNeilBrown * violating it, so limit ->max_segments to 1 lying within 2526627a2d3cSNeilBrown * a single page, as a one page request is never in violation. 2527709ae487SNeilBrown */ 2528627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 2529627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 2530627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 2531627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 2532627a2d3cSNeilBrown } 2533709ae487SNeilBrown } 2534709ae487SNeilBrown 2535709ae487SNeilBrown mddev->degraded = 0; 2536709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2537709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2538709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2539709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2540709ae487SNeilBrown mddev->degraded++; 2541709ae487SNeilBrown 2542709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2543709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2544709ae487SNeilBrown 25458c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 25469dd1e2faSNeilBrown printk(KERN_NOTICE "md/raid1:%s: not clean" 25478c6ac868SAndre Noll " -- starting background reconstruction\n", 25488c6ac868SAndre Noll mdname(mddev)); 25491da177e4SLinus Torvalds printk(KERN_INFO 25509dd1e2faSNeilBrown "md/raid1:%s: active with %d out of %d mirrors\n", 25511da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 25521da177e4SLinus Torvalds mddev->raid_disks); 2553709ae487SNeilBrown 25541da177e4SLinus Torvalds /* 25551da177e4SLinus Torvalds * Ok, everything is just fine now 25561da177e4SLinus Torvalds */ 2557709ae487SNeilBrown mddev->thread = conf->thread; 2558709ae487SNeilBrown conf->thread = NULL; 2559709ae487SNeilBrown mddev->private = conf; 2560709ae487SNeilBrown 25611f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 25621da177e4SLinus Torvalds 25631ed7242eSJonathan Brassow if (mddev->queue) { 25640d129228SNeilBrown mddev->queue->backing_dev_info.congested_fn = raid1_congested; 25650d129228SNeilBrown mddev->queue->backing_dev_info.congested_data = mddev; 25661ed7242eSJonathan Brassow } 2567a91a2785SMartin K. Petersen return md_integrity_register(mddev); 25681da177e4SLinus Torvalds } 25691da177e4SLinus Torvalds 2570fd01b88cSNeilBrown static int stop(struct mddev *mddev) 25711da177e4SLinus Torvalds { 2572e8096360SNeilBrown struct r1conf *conf = mddev->private; 25734b6d287fSNeilBrown struct bitmap *bitmap = mddev->bitmap; 25744b6d287fSNeilBrown 25754b6d287fSNeilBrown /* wait for behind writes to complete */ 2576e555190dSNeilBrown if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 25779dd1e2faSNeilBrown printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", 25789dd1e2faSNeilBrown mdname(mddev)); 25794b6d287fSNeilBrown /* need to kick something here to make sure I/O goes? */ 2580e555190dSNeilBrown wait_event(bitmap->behind_wait, 2581e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 25824b6d287fSNeilBrown } 25831da177e4SLinus Torvalds 2584409c57f3SNeilBrown raise_barrier(conf); 2585409c57f3SNeilBrown lower_barrier(conf); 2586409c57f3SNeilBrown 258701f96c0aSNeilBrown md_unregister_thread(&mddev->thread); 25881da177e4SLinus Torvalds if (conf->r1bio_pool) 25891da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 25901da177e4SLinus Torvalds kfree(conf->mirrors); 25911da177e4SLinus Torvalds kfree(conf->poolinfo); 25921da177e4SLinus Torvalds kfree(conf); 25931da177e4SLinus Torvalds mddev->private = NULL; 25941da177e4SLinus Torvalds return 0; 25951da177e4SLinus Torvalds } 25961da177e4SLinus Torvalds 2597fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 25981da177e4SLinus Torvalds { 25991da177e4SLinus Torvalds /* no resync is happening, and there is enough space 26001da177e4SLinus Torvalds * on all devices, so we can resize. 26011da177e4SLinus Torvalds * We need to make sure resync covers any new space. 26021da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 26031da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 26041da177e4SLinus Torvalds * worth it. 26051da177e4SLinus Torvalds */ 26061f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); 2607b522adcdSDan Williams if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) 2608b522adcdSDan Williams return -EINVAL; 2609f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 2610449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 2611b522adcdSDan Williams if (sectors > mddev->dev_sectors && 2612b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 261358c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 26141da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 26151da177e4SLinus Torvalds } 2616b522adcdSDan Williams mddev->dev_sectors = sectors; 26174b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 26181da177e4SLinus Torvalds return 0; 26191da177e4SLinus Torvalds } 26201da177e4SLinus Torvalds 2621fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 26221da177e4SLinus Torvalds { 26231da177e4SLinus Torvalds /* We need to: 26241da177e4SLinus Torvalds * 1/ resize the r1bio_pool 26251da177e4SLinus Torvalds * 2/ resize conf->mirrors 26261da177e4SLinus Torvalds * 26271da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 26281da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 26291da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 26306ea9c07cSNeilBrown * 26316ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 26326ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 26331da177e4SLinus Torvalds */ 26341da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 26351da177e4SLinus Torvalds struct pool_info *newpoolinfo; 26360f6d02d5SNeilBrown struct mirror_info *newmirrors; 2637e8096360SNeilBrown struct r1conf *conf = mddev->private; 263863c70c4fSNeilBrown int cnt, raid_disks; 2639c04be0aaSNeilBrown unsigned long flags; 2640b5470dc5SDan Williams int d, d2, err; 26411da177e4SLinus Torvalds 264263c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 2643664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 264463c70c4fSNeilBrown mddev->layout != mddev->new_layout || 264563c70c4fSNeilBrown mddev->level != mddev->new_level) { 2646664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 264763c70c4fSNeilBrown mddev->new_layout = mddev->layout; 264863c70c4fSNeilBrown mddev->new_level = mddev->level; 264963c70c4fSNeilBrown return -EINVAL; 265063c70c4fSNeilBrown } 265163c70c4fSNeilBrown 2652b5470dc5SDan Williams err = md_allow_write(mddev); 2653b5470dc5SDan Williams if (err) 2654b5470dc5SDan Williams return err; 26552a2275d6SNeilBrown 265663c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 265763c70c4fSNeilBrown 26586ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 26596ea9c07cSNeilBrown cnt=0; 26606ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 26611da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 26626ea9c07cSNeilBrown cnt++; 26636ea9c07cSNeilBrown if (cnt > raid_disks) 26641da177e4SLinus Torvalds return -EBUSY; 26656ea9c07cSNeilBrown } 26661da177e4SLinus Torvalds 26671da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 26681da177e4SLinus Torvalds if (!newpoolinfo) 26691da177e4SLinus Torvalds return -ENOMEM; 26701da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 26711da177e4SLinus Torvalds newpoolinfo->raid_disks = raid_disks; 26721da177e4SLinus Torvalds 26731da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 26741da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 26751da177e4SLinus Torvalds if (!newpool) { 26761da177e4SLinus Torvalds kfree(newpoolinfo); 26771da177e4SLinus Torvalds return -ENOMEM; 26781da177e4SLinus Torvalds } 26799ffae0cfSNeilBrown newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); 26801da177e4SLinus Torvalds if (!newmirrors) { 26811da177e4SLinus Torvalds kfree(newpoolinfo); 26821da177e4SLinus Torvalds mempool_destroy(newpool); 26831da177e4SLinus Torvalds return -ENOMEM; 26841da177e4SLinus Torvalds } 26851da177e4SLinus Torvalds 268617999be4SNeilBrown raise_barrier(conf); 26871da177e4SLinus Torvalds 26881da177e4SLinus Torvalds /* ok, everything is stopped */ 26891da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 26901da177e4SLinus Torvalds conf->r1bio_pool = newpool; 26916ea9c07cSNeilBrown 2692a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 26933cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 2694a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 269536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 2696a88aa786SNeilBrown rdev->raid_disk = d2; 269736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 269836fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 2699a88aa786SNeilBrown printk(KERN_WARNING 270036fad858SNamhyung Kim "md/raid1:%s: cannot register rd%d\n", 270136fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 2702a88aa786SNeilBrown } 2703a88aa786SNeilBrown if (rdev) 2704a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 27056ea9c07cSNeilBrown } 27061da177e4SLinus Torvalds kfree(conf->mirrors); 27071da177e4SLinus Torvalds conf->mirrors = newmirrors; 27081da177e4SLinus Torvalds kfree(conf->poolinfo); 27091da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 27101da177e4SLinus Torvalds 2711c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 27121da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 2713c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 27141da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 271563c70c4fSNeilBrown mddev->delta_disks = 0; 27161da177e4SLinus Torvalds 27176ea9c07cSNeilBrown conf->last_used = 0; /* just make sure it is in-range */ 271817999be4SNeilBrown lower_barrier(conf); 27191da177e4SLinus Torvalds 27201da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 27211da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 27221da177e4SLinus Torvalds 27231da177e4SLinus Torvalds mempool_destroy(oldpool); 27241da177e4SLinus Torvalds return 0; 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 2727fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 272836fa3063SNeilBrown { 2729e8096360SNeilBrown struct r1conf *conf = mddev->private; 273036fa3063SNeilBrown 273136fa3063SNeilBrown switch(state) { 27326eef4b21SNeilBrown case 2: /* wake for suspend */ 27336eef4b21SNeilBrown wake_up(&conf->wait_barrier); 27346eef4b21SNeilBrown break; 27359e6603daSNeilBrown case 1: 273617999be4SNeilBrown raise_barrier(conf); 273736fa3063SNeilBrown break; 27389e6603daSNeilBrown case 0: 273917999be4SNeilBrown lower_barrier(conf); 274036fa3063SNeilBrown break; 274136fa3063SNeilBrown } 274236fa3063SNeilBrown } 274336fa3063SNeilBrown 2744fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 2745709ae487SNeilBrown { 2746709ae487SNeilBrown /* raid1 can take over: 2747709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 2748709ae487SNeilBrown */ 2749709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 2750e8096360SNeilBrown struct r1conf *conf; 2751709ae487SNeilBrown mddev->new_level = 1; 2752709ae487SNeilBrown mddev->new_layout = 0; 2753709ae487SNeilBrown mddev->new_chunk_sectors = 0; 2754709ae487SNeilBrown conf = setup_conf(mddev); 2755709ae487SNeilBrown if (!IS_ERR(conf)) 2756709ae487SNeilBrown conf->barrier = 1; 2757709ae487SNeilBrown return conf; 2758709ae487SNeilBrown } 2759709ae487SNeilBrown return ERR_PTR(-EINVAL); 2760709ae487SNeilBrown } 27611da177e4SLinus Torvalds 276284fc4b56SNeilBrown static struct md_personality raid1_personality = 27631da177e4SLinus Torvalds { 27641da177e4SLinus Torvalds .name = "raid1", 27652604b703SNeilBrown .level = 1, 27661da177e4SLinus Torvalds .owner = THIS_MODULE, 27671da177e4SLinus Torvalds .make_request = make_request, 27681da177e4SLinus Torvalds .run = run, 27691da177e4SLinus Torvalds .stop = stop, 27701da177e4SLinus Torvalds .status = status, 27711da177e4SLinus Torvalds .error_handler = error, 27721da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 27731da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 27741da177e4SLinus Torvalds .spare_active = raid1_spare_active, 27751da177e4SLinus Torvalds .sync_request = sync_request, 27761da177e4SLinus Torvalds .resize = raid1_resize, 277780c3a6ceSDan Williams .size = raid1_size, 277863c70c4fSNeilBrown .check_reshape = raid1_reshape, 277936fa3063SNeilBrown .quiesce = raid1_quiesce, 2780709ae487SNeilBrown .takeover = raid1_takeover, 27811da177e4SLinus Torvalds }; 27821da177e4SLinus Torvalds 27831da177e4SLinus Torvalds static int __init raid_init(void) 27841da177e4SLinus Torvalds { 27852604b703SNeilBrown return register_md_personality(&raid1_personality); 27861da177e4SLinus Torvalds } 27871da177e4SLinus Torvalds 27881da177e4SLinus Torvalds static void raid_exit(void) 27891da177e4SLinus Torvalds { 27902604b703SNeilBrown unregister_md_personality(&raid1_personality); 27911da177e4SLinus Torvalds } 27921da177e4SLinus Torvalds 27931da177e4SLinus Torvalds module_init(raid_init); 27941da177e4SLinus Torvalds module_exit(raid_exit); 27951da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 27960efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 27971da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 2798d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 27992604b703SNeilBrown MODULE_ALIAS("md-level-1"); 280034db0cd6SNeilBrown 280134db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 2802