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 49473e87ceSJonathan Brassow /* when we get a read error on a read-only array, we redirect to another 50473e87ceSJonathan Brassow * device without failing the first device, or trying to over-write to 51473e87ceSJonathan Brassow * correct the read error. To keep track of bad blocks on a per-bio 52473e87ceSJonathan Brassow * level, we store IO_BLOCKED in the appropriate 'bios' pointer 53473e87ceSJonathan Brassow */ 54473e87ceSJonathan Brassow #define IO_BLOCKED ((struct bio *)1) 55473e87ceSJonathan Brassow /* When we successfully write to a known bad-block, we need to remove the 56473e87ceSJonathan Brassow * bad-block marking which must be done from process context. So we record 57473e87ceSJonathan Brassow * the success by setting devs[n].bio to IO_MADE_GOOD 58473e87ceSJonathan Brassow */ 59473e87ceSJonathan Brassow #define IO_MADE_GOOD ((struct bio *)2) 60473e87ceSJonathan Brassow 61473e87ceSJonathan Brassow #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 62473e87ceSJonathan Brassow 6334db0cd6SNeilBrown /* When there are this many requests queue to be written by 6434db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 6534db0cd6SNeilBrown * for writeback. 6634db0cd6SNeilBrown */ 6734db0cd6SNeilBrown static int max_queued_requests = 1024; 681da177e4SLinus Torvalds 69e8096360SNeilBrown static void allow_barrier(struct r1conf *conf); 70e8096360SNeilBrown static void lower_barrier(struct r1conf *conf); 711da177e4SLinus Torvalds 72dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 731da177e4SLinus Torvalds { 741da177e4SLinus Torvalds struct pool_info *pi = data; 759f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 787eaceaccSJens Axboe return kzalloc(size, gfp_flags); 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds kfree(r1_bio); 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 871da177e4SLinus Torvalds //#define RESYNC_BLOCK_SIZE PAGE_SIZE 881da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 891da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 901da177e4SLinus Torvalds #define RESYNC_WINDOW (2048*1024) 911da177e4SLinus Torvalds 92dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds struct pool_info *pi = data; 951da177e4SLinus Torvalds struct page *page; 969f2c9d12SNeilBrown struct r1bio *r1_bio; 971da177e4SLinus Torvalds struct bio *bio; 981da177e4SLinus Torvalds int i, j; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1017eaceaccSJens Axboe if (!r1_bio) 1021da177e4SLinus Torvalds return NULL; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds /* 1051da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1061da177e4SLinus Torvalds */ 1071da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1086746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1091da177e4SLinus Torvalds if (!bio) 1101da177e4SLinus Torvalds goto out_free_bio; 1111da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 115d11c171eSNeilBrown * the first bio. 116d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 117d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1181da177e4SLinus Torvalds */ 119d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 120d11c171eSNeilBrown j = pi->raid_disks; 121d11c171eSNeilBrown else 122d11c171eSNeilBrown j = 1; 123d11c171eSNeilBrown while(j--) { 124d11c171eSNeilBrown bio = r1_bio->bios[j]; 1251da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1261da177e4SLinus Torvalds page = alloc_page(gfp_flags); 1271da177e4SLinus Torvalds if (unlikely(!page)) 1281da177e4SLinus Torvalds goto out_free_pages; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = page; 131303a0e11SNeilBrown bio->bi_vcnt = i+1; 1321da177e4SLinus Torvalds } 133d11c171eSNeilBrown } 134d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 135d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 136d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 137d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 138d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 139d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 140d11c171eSNeilBrown } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds return r1_bio; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds out_free_pages: 147d11c171eSNeilBrown for (j=0 ; j < pi->raid_disks; j++) 148303a0e11SNeilBrown for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) 149303a0e11SNeilBrown put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); 150d11c171eSNeilBrown j = -1; 1511da177e4SLinus Torvalds out_free_bio: 1521da177e4SLinus Torvalds while (++j < pi->raid_disks) 1531da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1541da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1551da177e4SLinus Torvalds return NULL; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds struct pool_info *pi = data; 161d11c171eSNeilBrown int i,j; 1629f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 1631da177e4SLinus Torvalds 164d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 165d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 166d11c171eSNeilBrown if (j == 0 || 167d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 168d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1691345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1721da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds 177e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 1781da177e4SLinus Torvalds { 1791da177e4SLinus Torvalds int i; 1801da177e4SLinus Torvalds 1818f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1821da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1834367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1841da177e4SLinus Torvalds bio_put(*bio); 1851da177e4SLinus Torvalds *bio = NULL; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1899f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 1901da177e4SLinus Torvalds { 191e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1941da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 1979f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 1981da177e4SLinus Torvalds { 199e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2003e198f78SNeilBrown int i; 2013e198f78SNeilBrown 2028f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2033e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2043e198f78SNeilBrown if (bio->bi_end_io) 2053e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2063e198f78SNeilBrown } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2091da177e4SLinus Torvalds 21017999be4SNeilBrown lower_barrier(conf); 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds 2139f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds unsigned long flags; 216fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 217e8096360SNeilBrown struct r1conf *conf = mddev->private; 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2201da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 221ddaf22abSNeilBrown conf->nr_queued ++; 2221da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2231da177e4SLinus Torvalds 22417999be4SNeilBrown wake_up(&conf->wait_barrier); 2251da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* 2291da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2301da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2311da177e4SLinus Torvalds * cache layer. 2321da177e4SLinus Torvalds */ 2339f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 234d2eb35acSNeilBrown { 235d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 236d2eb35acSNeilBrown int done; 237e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 238d2eb35acSNeilBrown 239d2eb35acSNeilBrown if (bio->bi_phys_segments) { 240d2eb35acSNeilBrown unsigned long flags; 241d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 242d2eb35acSNeilBrown bio->bi_phys_segments--; 243d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 244d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 245d2eb35acSNeilBrown } else 246d2eb35acSNeilBrown done = 1; 247d2eb35acSNeilBrown 248d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 249d2eb35acSNeilBrown clear_bit(BIO_UPTODATE, &bio->bi_flags); 250d2eb35acSNeilBrown if (done) { 251d2eb35acSNeilBrown bio_endio(bio, 0); 252d2eb35acSNeilBrown /* 253d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 254d2eb35acSNeilBrown * to go idle. 255d2eb35acSNeilBrown */ 256d2eb35acSNeilBrown allow_barrier(conf); 257d2eb35acSNeilBrown } 258d2eb35acSNeilBrown } 259d2eb35acSNeilBrown 2609f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2631da177e4SLinus Torvalds 2644b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2654b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 26636a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2674b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2684b6d287fSNeilBrown (unsigned long long) bio->bi_sector, 2694b6d287fSNeilBrown (unsigned long long) bio->bi_sector + 2704b6d287fSNeilBrown (bio->bi_size >> 9) - 1); 2714b6d287fSNeilBrown 272d2eb35acSNeilBrown call_bio_endio(r1_bio); 2734b6d287fSNeilBrown } 2741da177e4SLinus Torvalds free_r1bio(r1_bio); 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* 2781da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2791da177e4SLinus Torvalds */ 2809f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 2811da177e4SLinus Torvalds { 282e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2851da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 288ba3ae3beSNamhyung Kim /* 289ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 290ba3ae3beSNamhyung Kim */ 2919f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 292ba3ae3beSNamhyung Kim { 293ba3ae3beSNamhyung Kim int mirror; 29430194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 29530194636SNeilBrown int raid_disks = conf->raid_disks; 296ba3ae3beSNamhyung Kim 2978f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 298ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 299ba3ae3beSNamhyung Kim break; 300ba3ae3beSNamhyung Kim 3018f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 302ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 303ba3ae3beSNamhyung Kim 304ba3ae3beSNamhyung Kim return mirror; 305ba3ae3beSNamhyung Kim } 306ba3ae3beSNamhyung Kim 3076712ecf8SNeilBrown static void raid1_end_read_request(struct bio *bio, int error) 3081da177e4SLinus Torvalds { 3091da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3109f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 3111da177e4SLinus Torvalds int mirror; 312e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds mirror = r1_bio->read_disk; 3151da177e4SLinus Torvalds /* 3161da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3171da177e4SLinus Torvalds */ 318ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 319ddaf22abSNeilBrown 320220946c9SNeilBrown if (uptodate) 3211da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 322dd00a99eSNeilBrown else { 323dd00a99eSNeilBrown /* If all other devices have failed, we want to return 324dd00a99eSNeilBrown * the error upwards rather than fail the last device. 325dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 326dd00a99eSNeilBrown */ 327dd00a99eSNeilBrown unsigned long flags; 328dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 329dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 330dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 331dd00a99eSNeilBrown !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) 332dd00a99eSNeilBrown uptodate = 1; 333dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 334dd00a99eSNeilBrown } 3351da177e4SLinus Torvalds 336dd00a99eSNeilBrown if (uptodate) 3371da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 338dd00a99eSNeilBrown else { 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * oops, read error: 3411da177e4SLinus Torvalds */ 3421da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3438bda470eSChristian Dietrich printk_ratelimited( 3448bda470eSChristian Dietrich KERN_ERR "md/raid1:%s: %s: " 3458bda470eSChristian Dietrich "rescheduling sector %llu\n", 3469dd1e2faSNeilBrown mdname(conf->mddev), 3478bda470eSChristian Dietrich bdevname(conf->mirrors[mirror].rdev->bdev, 3488bda470eSChristian Dietrich b), 3498bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 350d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3511da177e4SLinus Torvalds reschedule_retry(r1_bio); 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 3579f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3584e78064fSNeilBrown { 3594e78064fSNeilBrown /* it really is the end of this request */ 3604e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3614e78064fSNeilBrown /* free extra copy of the data pages */ 362af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3634e78064fSNeilBrown while (i--) 3642ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3652ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3662ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3674e78064fSNeilBrown } 3684e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3694e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3704e78064fSNeilBrown r1_bio->sectors, 3714e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 372af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3734e78064fSNeilBrown md_write_end(r1_bio->mddev); 374cd5ff9a1SNeilBrown } 375cd5ff9a1SNeilBrown 3769f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 377cd5ff9a1SNeilBrown { 378cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 379cd5ff9a1SNeilBrown return; 380cd5ff9a1SNeilBrown 381cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 382cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 383cd5ff9a1SNeilBrown else { 384cd5ff9a1SNeilBrown close_write(r1_bio); 3854367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3864367af55SNeilBrown reschedule_retry(r1_bio); 3874367af55SNeilBrown else 3884e78064fSNeilBrown raid_end_bio_io(r1_bio); 3894e78064fSNeilBrown } 3904e78064fSNeilBrown } 3914e78064fSNeilBrown 3926712ecf8SNeilBrown static void raid1_end_write_request(struct bio *bio, int error) 3931da177e4SLinus Torvalds { 3941da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3959f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 396a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 397e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 39804b857f7SNeilBrown struct bio *to_put = NULL; 3991da177e4SLinus Torvalds 400ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* 403e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4041da177e4SLinus Torvalds */ 405191ea9b2SNeilBrown if (!uptodate) { 406cd5ff9a1SNeilBrown set_bit(WriteErrorSeen, 407cd5ff9a1SNeilBrown &conf->mirrors[mirror].rdev->flags); 40819d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 40919d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 41019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 41119d67169SNeilBrown conf->mddev->recovery); 41219d67169SNeilBrown 413cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4144367af55SNeilBrown } else { 4151da177e4SLinus Torvalds /* 416e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 417e9c7469bSTejun Heo * will return a good error code for to the higher 418e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 419e9c7469bSTejun Heo * fails. 4201da177e4SLinus Torvalds * 421e9c7469bSTejun Heo * The 'master' represents the composite IO operation 422e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 423e9c7469bSTejun Heo * will wait for the 'master' bio. 4241da177e4SLinus Torvalds */ 4254367af55SNeilBrown sector_t first_bad; 4264367af55SNeilBrown int bad_sectors; 4274367af55SNeilBrown 428cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 429cd5ff9a1SNeilBrown to_put = bio; 4301da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4311da177e4SLinus Torvalds 4324367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 4334367af55SNeilBrown if (is_badblock(conf->mirrors[mirror].rdev, 4344367af55SNeilBrown r1_bio->sector, r1_bio->sectors, 4354367af55SNeilBrown &first_bad, &bad_sectors)) { 4364367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4374367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4384367af55SNeilBrown } 4394367af55SNeilBrown } 4404367af55SNeilBrown 4414b6d287fSNeilBrown if (behind) { 4424b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 4434b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4444b6d287fSNeilBrown 445e9c7469bSTejun Heo /* 446e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 447e9c7469bSTejun Heo * has safely reached all non-writemostly 448e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 449e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 450e9c7469bSTejun Heo * -EIO here, instead we'll wait 451e9c7469bSTejun Heo */ 4524b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4534b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4544b6d287fSNeilBrown /* Maybe we can return now */ 4554b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4564b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 45736a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 45836a4e1feSNeilBrown " %llu-%llu\n", 4594b6d287fSNeilBrown (unsigned long long) mbio->bi_sector, 4604b6d287fSNeilBrown (unsigned long long) mbio->bi_sector + 4614b6d287fSNeilBrown (mbio->bi_size >> 9) - 1); 462d2eb35acSNeilBrown call_bio_endio(r1_bio); 4634b6d287fSNeilBrown } 4644b6d287fSNeilBrown } 4654b6d287fSNeilBrown } 4664367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 4674367af55SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, 4684367af55SNeilBrown conf->mddev); 469e9c7469bSTejun Heo 4701da177e4SLinus Torvalds /* 4711da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4721da177e4SLinus Torvalds * already. 4731da177e4SLinus Torvalds */ 474af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 475c70810b3SNeilBrown 47604b857f7SNeilBrown if (to_put) 47704b857f7SNeilBrown bio_put(to_put); 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds 4811da177e4SLinus Torvalds /* 4821da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4831da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4841da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4851da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4861da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 4871da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 4881da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 4891da177e4SLinus Torvalds * 4901da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 4911da177e4SLinus Torvalds * because position is mirror, not device based. 4921da177e4SLinus Torvalds * 4931da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 4941da177e4SLinus Torvalds */ 495e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 4961da177e4SLinus Torvalds { 497af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 498d2eb35acSNeilBrown int sectors; 499d2eb35acSNeilBrown int best_good_sectors; 5009dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5019dedf603SShaohua Li int has_nonrot_disk; 502be4d3280SShaohua Li int disk; 50376073054SNeilBrown sector_t best_dist; 5049dedf603SShaohua Li unsigned int min_pending; 5053cb03002SNeilBrown struct md_rdev *rdev; 506f3ac8bf7SNeilBrown int choose_first; 50712cee5a8SShaohua Li int choose_next_idle; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds rcu_read_lock(); 5101da177e4SLinus Torvalds /* 5118ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5121da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5131da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5141da177e4SLinus Torvalds */ 5151da177e4SLinus Torvalds retry: 516d2eb35acSNeilBrown sectors = r1_bio->sectors; 51776073054SNeilBrown best_disk = -1; 5189dedf603SShaohua Li best_dist_disk = -1; 51976073054SNeilBrown best_dist = MaxSector; 5209dedf603SShaohua Li best_pending_disk = -1; 5219dedf603SShaohua Li min_pending = UINT_MAX; 522d2eb35acSNeilBrown best_good_sectors = 0; 5239dedf603SShaohua Li has_nonrot_disk = 0; 52412cee5a8SShaohua Li choose_next_idle = 0; 525d2eb35acSNeilBrown 5261da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 527be4d3280SShaohua Li (this_sector + sectors >= conf->next_resync)) 528f3ac8bf7SNeilBrown choose_first = 1; 529be4d3280SShaohua Li else 530f3ac8bf7SNeilBrown choose_first = 0; 5311da177e4SLinus Torvalds 532be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 53376073054SNeilBrown sector_t dist; 534d2eb35acSNeilBrown sector_t first_bad; 535d2eb35acSNeilBrown int bad_sectors; 5369dedf603SShaohua Li unsigned int pending; 53712cee5a8SShaohua Li bool nonrot; 538d2eb35acSNeilBrown 539f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 540f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 541f3ac8bf7SNeilBrown || rdev == NULL 5426b740b8dSNeilBrown || test_bit(Unmerged, &rdev->flags) 54376073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 544f3ac8bf7SNeilBrown continue; 54576073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 54676073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 54776073054SNeilBrown continue; 54876073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 54976073054SNeilBrown /* Don't balance among write-mostly, just 55076073054SNeilBrown * use the first as a last resort */ 551307729c8SNeilBrown if (best_disk < 0) { 552307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 553307729c8SNeilBrown &first_bad, &bad_sectors)) { 554307729c8SNeilBrown if (first_bad < this_sector) 555307729c8SNeilBrown /* Cannot use this */ 556307729c8SNeilBrown continue; 557307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 558307729c8SNeilBrown } else 559307729c8SNeilBrown best_good_sectors = sectors; 56076073054SNeilBrown best_disk = disk; 561307729c8SNeilBrown } 56276073054SNeilBrown continue; 5638ddf9efeSNeilBrown } 56476073054SNeilBrown /* This is a reasonable device to use. It might 56576073054SNeilBrown * even be best. 5661da177e4SLinus Torvalds */ 567d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 568d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 569d2eb35acSNeilBrown if (best_dist < MaxSector) 570d2eb35acSNeilBrown /* already have a better device */ 571d2eb35acSNeilBrown continue; 572d2eb35acSNeilBrown if (first_bad <= this_sector) { 573d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 574d2eb35acSNeilBrown * device, then we must not read beyond 575d2eb35acSNeilBrown * bad_sectors from another device.. 576d2eb35acSNeilBrown */ 577d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 578d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 579d2eb35acSNeilBrown sectors = bad_sectors; 580d2eb35acSNeilBrown if (best_good_sectors > sectors) 581d2eb35acSNeilBrown best_good_sectors = sectors; 582d2eb35acSNeilBrown 583d2eb35acSNeilBrown } else { 584d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 585d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 586d2eb35acSNeilBrown best_good_sectors = good_sectors; 587d2eb35acSNeilBrown best_disk = disk; 588d2eb35acSNeilBrown } 589d2eb35acSNeilBrown if (choose_first) 590d2eb35acSNeilBrown break; 591d2eb35acSNeilBrown } 592d2eb35acSNeilBrown continue; 593d2eb35acSNeilBrown } else 594d2eb35acSNeilBrown best_good_sectors = sectors; 595d2eb35acSNeilBrown 59612cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 59712cee5a8SShaohua Li has_nonrot_disk |= nonrot; 5989dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 59976073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 60012cee5a8SShaohua Li if (choose_first) { 60176073054SNeilBrown best_disk = disk; 6021da177e4SLinus Torvalds break; 6031da177e4SLinus Torvalds } 60412cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 60512cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 60612cee5a8SShaohua Li || dist == 0) { 60712cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 60812cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 60912cee5a8SShaohua Li 61012cee5a8SShaohua Li best_disk = disk; 61112cee5a8SShaohua Li /* 61212cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 61312cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 61412cee5a8SShaohua Li * the idle disk. read_balance could already choose an 61512cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 61612cee5a8SShaohua Li * this disk. This doesn't matter because this disk 61712cee5a8SShaohua Li * will idle, next time it will be utilized after the 61812cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 61912cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 62012cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 62112cee5a8SShaohua Li * small, but not a big deal since when the second disk 62212cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 62312cee5a8SShaohua Li */ 62412cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 62512cee5a8SShaohua Li mirror->seq_start != MaxSector && 62612cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 62712cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 62812cee5a8SShaohua Li mirror->seq_start) { 62912cee5a8SShaohua Li choose_next_idle = 1; 63012cee5a8SShaohua Li continue; 63112cee5a8SShaohua Li } 63212cee5a8SShaohua Li break; 63312cee5a8SShaohua Li } 63412cee5a8SShaohua Li /* If device is idle, use it */ 63512cee5a8SShaohua Li if (pending == 0) { 63612cee5a8SShaohua Li best_disk = disk; 63712cee5a8SShaohua Li break; 63812cee5a8SShaohua Li } 63912cee5a8SShaohua Li 64012cee5a8SShaohua Li if (choose_next_idle) 64112cee5a8SShaohua Li continue; 6429dedf603SShaohua Li 6439dedf603SShaohua Li if (min_pending > pending) { 6449dedf603SShaohua Li min_pending = pending; 6459dedf603SShaohua Li best_pending_disk = disk; 6469dedf603SShaohua Li } 6479dedf603SShaohua Li 64876073054SNeilBrown if (dist < best_dist) { 64976073054SNeilBrown best_dist = dist; 6509dedf603SShaohua Li best_dist_disk = disk; 6511da177e4SLinus Torvalds } 652f3ac8bf7SNeilBrown } 6531da177e4SLinus Torvalds 6549dedf603SShaohua Li /* 6559dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 6569dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 6579dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 6589dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 6599dedf603SShaohua Li */ 6609dedf603SShaohua Li if (best_disk == -1) { 6619dedf603SShaohua Li if (has_nonrot_disk) 6629dedf603SShaohua Li best_disk = best_pending_disk; 6639dedf603SShaohua Li else 6649dedf603SShaohua Li best_disk = best_dist_disk; 6659dedf603SShaohua Li } 6669dedf603SShaohua Li 66776073054SNeilBrown if (best_disk >= 0) { 66876073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 6698ddf9efeSNeilBrown if (!rdev) 6708ddf9efeSNeilBrown goto retry; 6718ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 67276073054SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 6731da177e4SLinus Torvalds /* cannot risk returning a device that failed 6741da177e4SLinus Torvalds * before we inc'ed nr_pending 6751da177e4SLinus Torvalds */ 67603c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 6771da177e4SLinus Torvalds goto retry; 6781da177e4SLinus Torvalds } 679d2eb35acSNeilBrown sectors = best_good_sectors; 68012cee5a8SShaohua Li 68112cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 68212cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 68312cee5a8SShaohua Li 684be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds rcu_read_unlock(); 687d2eb35acSNeilBrown *max_sectors = sectors; 6881da177e4SLinus Torvalds 68976073054SNeilBrown return best_disk; 6901da177e4SLinus Torvalds } 6911da177e4SLinus Torvalds 6926b740b8dSNeilBrown static int raid1_mergeable_bvec(struct request_queue *q, 6936b740b8dSNeilBrown struct bvec_merge_data *bvm, 6946b740b8dSNeilBrown struct bio_vec *biovec) 6956b740b8dSNeilBrown { 6966b740b8dSNeilBrown struct mddev *mddev = q->queuedata; 6976b740b8dSNeilBrown struct r1conf *conf = mddev->private; 6986b740b8dSNeilBrown sector_t sector = bvm->bi_sector + get_start_sect(bvm->bi_bdev); 6996b740b8dSNeilBrown int max = biovec->bv_len; 7006b740b8dSNeilBrown 7016b740b8dSNeilBrown if (mddev->merge_check_needed) { 7026b740b8dSNeilBrown int disk; 7036b740b8dSNeilBrown rcu_read_lock(); 7046b740b8dSNeilBrown for (disk = 0; disk < conf->raid_disks * 2; disk++) { 7056b740b8dSNeilBrown struct md_rdev *rdev = rcu_dereference( 7066b740b8dSNeilBrown conf->mirrors[disk].rdev); 7076b740b8dSNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 7086b740b8dSNeilBrown struct request_queue *q = 7096b740b8dSNeilBrown bdev_get_queue(rdev->bdev); 7106b740b8dSNeilBrown if (q->merge_bvec_fn) { 7116b740b8dSNeilBrown bvm->bi_sector = sector + 7126b740b8dSNeilBrown rdev->data_offset; 7136b740b8dSNeilBrown bvm->bi_bdev = rdev->bdev; 7146b740b8dSNeilBrown max = min(max, q->merge_bvec_fn( 7156b740b8dSNeilBrown q, bvm, biovec)); 7166b740b8dSNeilBrown } 7176b740b8dSNeilBrown } 7186b740b8dSNeilBrown } 7196b740b8dSNeilBrown rcu_read_unlock(); 7206b740b8dSNeilBrown } 7216b740b8dSNeilBrown return max; 7226b740b8dSNeilBrown 7236b740b8dSNeilBrown } 7246b740b8dSNeilBrown 725fd01b88cSNeilBrown int md_raid1_congested(struct mddev *mddev, int bits) 7260d129228SNeilBrown { 727e8096360SNeilBrown struct r1conf *conf = mddev->private; 7280d129228SNeilBrown int i, ret = 0; 7290d129228SNeilBrown 73034db0cd6SNeilBrown if ((bits & (1 << BDI_async_congested)) && 73134db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 73234db0cd6SNeilBrown return 1; 73334db0cd6SNeilBrown 7340d129228SNeilBrown rcu_read_lock(); 735f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7363cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7370d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 738165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7390d129228SNeilBrown 7401ed7242eSJonathan Brassow BUG_ON(!q); 7411ed7242eSJonathan Brassow 7420d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7430d129228SNeilBrown * non-congested targets, it can be removed 7440d129228SNeilBrown */ 74591a9e99dSAlexander Beregalov if ((bits & (1<<BDI_async_congested)) || 1) 7460d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 7470d129228SNeilBrown else 7480d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 7490d129228SNeilBrown } 7500d129228SNeilBrown } 7510d129228SNeilBrown rcu_read_unlock(); 7520d129228SNeilBrown return ret; 7530d129228SNeilBrown } 7541ed7242eSJonathan Brassow EXPORT_SYMBOL_GPL(md_raid1_congested); 7550d129228SNeilBrown 7561ed7242eSJonathan Brassow static int raid1_congested(void *data, int bits) 7571ed7242eSJonathan Brassow { 758fd01b88cSNeilBrown struct mddev *mddev = data; 7591ed7242eSJonathan Brassow 7601ed7242eSJonathan Brassow return mddev_congested(mddev, bits) || 7611ed7242eSJonathan Brassow md_raid1_congested(mddev, bits); 7621ed7242eSJonathan Brassow } 7630d129228SNeilBrown 764e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 765a35e63efSNeilBrown { 766a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 767a35e63efSNeilBrown * bitmap updates get flushed here. 768a35e63efSNeilBrown */ 769a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 770a35e63efSNeilBrown 771a35e63efSNeilBrown if (conf->pending_bio_list.head) { 772a35e63efSNeilBrown struct bio *bio; 773a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 77434db0cd6SNeilBrown conf->pending_count = 0; 775a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 776a35e63efSNeilBrown /* flush any pending bitmap writes to 777a35e63efSNeilBrown * disk before proceeding w/ I/O */ 778a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 77934db0cd6SNeilBrown wake_up(&conf->wait_barrier); 780a35e63efSNeilBrown 781a35e63efSNeilBrown while (bio) { /* submit pending writes */ 782a35e63efSNeilBrown struct bio *next = bio->bi_next; 783a35e63efSNeilBrown bio->bi_next = NULL; 784a35e63efSNeilBrown generic_make_request(bio); 785a35e63efSNeilBrown bio = next; 786a35e63efSNeilBrown } 787a35e63efSNeilBrown } else 788a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 7897eaceaccSJens Axboe } 7907eaceaccSJens Axboe 79117999be4SNeilBrown /* Barriers.... 79217999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 79317999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 79417999be4SNeilBrown * To do this we raise a 'barrier'. 79517999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 79617999be4SNeilBrown * to count how many activities are happening which preclude 79717999be4SNeilBrown * normal IO. 79817999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 79917999be4SNeilBrown * i.e. if nr_pending == 0. 80017999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 80117999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 80217999be4SNeilBrown * is ready, no other operations which require a barrier will start 80317999be4SNeilBrown * until the IO request has had a chance. 80417999be4SNeilBrown * 80517999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 80617999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 80717999be4SNeilBrown * allow_barrier when it has finished its IO. 80817999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 80917999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 81017999be4SNeilBrown * lower_barrier when the particular background IO completes. 8111da177e4SLinus Torvalds */ 8121da177e4SLinus Torvalds #define RESYNC_DEPTH 32 8131da177e4SLinus Torvalds 814e8096360SNeilBrown static void raise_barrier(struct r1conf *conf) 8151da177e4SLinus Torvalds { 8161da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8171da177e4SLinus Torvalds 81817999be4SNeilBrown /* Wait until no block IO is waiting */ 81917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 820c3b328acSNeilBrown conf->resync_lock, ); 82117999be4SNeilBrown 82217999be4SNeilBrown /* block any new IO from starting */ 82317999be4SNeilBrown conf->barrier++; 82417999be4SNeilBrown 825046abeedSNeilBrown /* Now wait for all pending IO to complete */ 82617999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 82717999be4SNeilBrown !conf->nr_pending && conf->barrier < RESYNC_DEPTH, 828c3b328acSNeilBrown conf->resync_lock, ); 82917999be4SNeilBrown 8301da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 833e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 83417999be4SNeilBrown { 83517999be4SNeilBrown unsigned long flags; 836709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 83717999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 83817999be4SNeilBrown conf->barrier--; 83917999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 84017999be4SNeilBrown wake_up(&conf->wait_barrier); 84117999be4SNeilBrown } 84217999be4SNeilBrown 843e8096360SNeilBrown static void wait_barrier(struct r1conf *conf) 84417999be4SNeilBrown { 84517999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 84617999be4SNeilBrown if (conf->barrier) { 84717999be4SNeilBrown conf->nr_waiting++; 848d6b42dcbSNeilBrown /* Wait for the barrier to drop. 849d6b42dcbSNeilBrown * However if there are already pending 850d6b42dcbSNeilBrown * requests (preventing the barrier from 851d6b42dcbSNeilBrown * rising completely), and the 852d6b42dcbSNeilBrown * pre-process bio queue isn't empty, 853d6b42dcbSNeilBrown * then don't wait, as we need to empty 854d6b42dcbSNeilBrown * that queue to get the nr_pending 855d6b42dcbSNeilBrown * count down. 856d6b42dcbSNeilBrown */ 857d6b42dcbSNeilBrown wait_event_lock_irq(conf->wait_barrier, 858d6b42dcbSNeilBrown !conf->barrier || 859d6b42dcbSNeilBrown (conf->nr_pending && 860d6b42dcbSNeilBrown current->bio_list && 861d6b42dcbSNeilBrown !bio_list_empty(current->bio_list)), 86217999be4SNeilBrown conf->resync_lock, 863c3b328acSNeilBrown ); 86417999be4SNeilBrown conf->nr_waiting--; 86517999be4SNeilBrown } 86617999be4SNeilBrown conf->nr_pending++; 86717999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 86817999be4SNeilBrown } 86917999be4SNeilBrown 870e8096360SNeilBrown static void allow_barrier(struct r1conf *conf) 87117999be4SNeilBrown { 87217999be4SNeilBrown unsigned long flags; 87317999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 87417999be4SNeilBrown conf->nr_pending--; 87517999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 87617999be4SNeilBrown wake_up(&conf->wait_barrier); 87717999be4SNeilBrown } 87817999be4SNeilBrown 879e8096360SNeilBrown static void freeze_array(struct r1conf *conf) 880ddaf22abSNeilBrown { 881ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 882ddaf22abSNeilBrown * go quite. 883ddaf22abSNeilBrown * We increment barrier and nr_waiting, and then 8841c830532SNeilBrown * wait until nr_pending match nr_queued+1 8851c830532SNeilBrown * This is called in the context of one normal IO request 8861c830532SNeilBrown * that has failed. Thus any sync request that might be pending 8871c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 8881c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 8891c830532SNeilBrown * Thus the number queued (nr_queued) plus this request (1) 8901c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 8911c830532SNeilBrown * we continue. 892ddaf22abSNeilBrown */ 893ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 894ddaf22abSNeilBrown conf->barrier++; 895ddaf22abSNeilBrown conf->nr_waiting++; 896ddaf22abSNeilBrown wait_event_lock_irq(conf->wait_barrier, 8971c830532SNeilBrown conf->nr_pending == conf->nr_queued+1, 898ddaf22abSNeilBrown conf->resync_lock, 899c3b328acSNeilBrown flush_pending_writes(conf)); 900ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 901ddaf22abSNeilBrown } 902e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 903ddaf22abSNeilBrown { 904ddaf22abSNeilBrown /* reverse the effect of the freeze */ 905ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 906ddaf22abSNeilBrown conf->barrier--; 907ddaf22abSNeilBrown conf->nr_waiting--; 908ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 909ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 910ddaf22abSNeilBrown } 911ddaf22abSNeilBrown 91217999be4SNeilBrown 9134e78064fSNeilBrown /* duplicate the data pages for behind I/O 9144e78064fSNeilBrown */ 9159f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 9164b6d287fSNeilBrown { 9174b6d287fSNeilBrown int i; 9184b6d287fSNeilBrown struct bio_vec *bvec; 9192ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 9204b6d287fSNeilBrown GFP_NOIO); 9212ca68f5eSNeilBrown if (unlikely(!bvecs)) 922af6d7b76SNeilBrown return; 9234b6d287fSNeilBrown 9244b6d287fSNeilBrown bio_for_each_segment(bvec, bio, i) { 9252ca68f5eSNeilBrown bvecs[i] = *bvec; 9262ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 9272ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 9284b6d287fSNeilBrown goto do_sync_io; 9292ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 9304b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 9312ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 9324b6d287fSNeilBrown kunmap(bvec->bv_page); 9334b6d287fSNeilBrown } 9342ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 935af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 936af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 937af6d7b76SNeilBrown return; 9384b6d287fSNeilBrown 9394b6d287fSNeilBrown do_sync_io: 940af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 9412ca68f5eSNeilBrown if (bvecs[i].bv_page) 9422ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 9432ca68f5eSNeilBrown kfree(bvecs); 94436a4e1feSNeilBrown pr_debug("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); 9454b6d287fSNeilBrown } 9464b6d287fSNeilBrown 947b4fdcb02SLinus Torvalds static void make_request(struct mddev *mddev, struct bio * bio) 9481da177e4SLinus Torvalds { 949e8096360SNeilBrown struct r1conf *conf = mddev->private; 9500eaf822cSJonathan Brassow struct raid1_info *mirror; 9519f2c9d12SNeilBrown struct r1bio *r1_bio; 9521da177e4SLinus Torvalds struct bio *read_bio; 9531f68f0c4SNeilBrown int i, disks; 95484255d10SNeilBrown struct bitmap *bitmap; 955191ea9b2SNeilBrown unsigned long flags; 956a362357bSJens Axboe const int rw = bio_data_dir(bio); 9572c7d46ecSNeilBrown const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); 958e9c7469bSTejun Heo const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); 9593cb03002SNeilBrown struct md_rdev *blocked_rdev; 9601f68f0c4SNeilBrown int first_clone; 9611f68f0c4SNeilBrown int sectors_handled; 9621f68f0c4SNeilBrown int max_sectors; 963191ea9b2SNeilBrown 9641da177e4SLinus Torvalds /* 9651da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 9661da177e4SLinus Torvalds * thread has put up a bar for new requests. 9671da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 9681da177e4SLinus Torvalds */ 96962de608dSNeilBrown 9703d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 9713d310eb7SNeilBrown 9726eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 9736eef4b21SNeilBrown bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && 9746eef4b21SNeilBrown bio->bi_sector < mddev->suspend_hi) { 9756eef4b21SNeilBrown /* As the suspend_* range is controlled by 9766eef4b21SNeilBrown * userspace, we want an interruptible 9776eef4b21SNeilBrown * wait. 9786eef4b21SNeilBrown */ 9796eef4b21SNeilBrown DEFINE_WAIT(w); 9806eef4b21SNeilBrown for (;;) { 9816eef4b21SNeilBrown flush_signals(current); 9826eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 9836eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 9846eef4b21SNeilBrown if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || 9856eef4b21SNeilBrown bio->bi_sector >= mddev->suspend_hi) 9866eef4b21SNeilBrown break; 9876eef4b21SNeilBrown schedule(); 9886eef4b21SNeilBrown } 9896eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 9906eef4b21SNeilBrown } 99162de608dSNeilBrown 99217999be4SNeilBrown wait_barrier(conf); 9931da177e4SLinus Torvalds 99484255d10SNeilBrown bitmap = mddev->bitmap; 99584255d10SNeilBrown 9961da177e4SLinus Torvalds /* 9971da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 9981da177e4SLinus Torvalds * used and no empty request is available. 9991da177e4SLinus Torvalds * 10001da177e4SLinus Torvalds */ 10011da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 10021da177e4SLinus Torvalds 10031da177e4SLinus Torvalds r1_bio->master_bio = bio; 10041da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 1005191ea9b2SNeilBrown r1_bio->state = 0; 10061da177e4SLinus Torvalds r1_bio->mddev = mddev; 10071da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 10081da177e4SLinus Torvalds 1009d2eb35acSNeilBrown /* We might need to issue multiple reads to different 1010d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 1011d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 1012d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 1013d2eb35acSNeilBrown * will be needed when requests complete. If it is 1014d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 1015d2eb35acSNeilBrown */ 1016d2eb35acSNeilBrown bio->bi_phys_segments = 0; 1017d2eb35acSNeilBrown clear_bit(BIO_SEG_VALID, &bio->bi_flags); 1018d2eb35acSNeilBrown 1019a362357bSJens Axboe if (rw == READ) { 10201da177e4SLinus Torvalds /* 10211da177e4SLinus Torvalds * read balancing logic: 10221da177e4SLinus Torvalds */ 1023d2eb35acSNeilBrown int rdisk; 1024d2eb35acSNeilBrown 1025d2eb35acSNeilBrown read_again: 1026d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds if (rdisk < 0) { 10291da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 10301da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 10315a7bbad2SChristoph Hellwig return; 10321da177e4SLinus Torvalds } 10331da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 10341da177e4SLinus Torvalds 1035e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1036e555190dSNeilBrown bitmap) { 1037e555190dSNeilBrown /* Reading from a write-mostly device must 1038e555190dSNeilBrown * take care not to over-take any writes 1039e555190dSNeilBrown * that are 'behind' 1040e555190dSNeilBrown */ 1041e555190dSNeilBrown wait_event(bitmap->behind_wait, 1042e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1043e555190dSNeilBrown } 10441da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 10451da177e4SLinus Torvalds 1046a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 1047d2eb35acSNeilBrown md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, 1048d2eb35acSNeilBrown max_sectors); 10491da177e4SLinus Torvalds 10501da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 10511da177e4SLinus Torvalds 10521da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 10531da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 10541da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 10557b6d91daSChristoph Hellwig read_bio->bi_rw = READ | do_sync; 10561da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 10571da177e4SLinus Torvalds 1058d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 1059d2eb35acSNeilBrown /* could not read all from this device, so we will 1060d2eb35acSNeilBrown * need another r1_bio. 1061d2eb35acSNeilBrown */ 1062d2eb35acSNeilBrown 1063d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 1064d2eb35acSNeilBrown - bio->bi_sector); 1065d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 1066d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 1067d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 1068d2eb35acSNeilBrown bio->bi_phys_segments = 2; 1069d2eb35acSNeilBrown else 1070d2eb35acSNeilBrown bio->bi_phys_segments++; 1071d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 1072d2eb35acSNeilBrown /* Cannot call generic_make_request directly 1073d2eb35acSNeilBrown * as that will be queued in __make_request 1074d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 1075d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 1076d2eb35acSNeilBrown */ 1077d2eb35acSNeilBrown reschedule_retry(r1_bio); 1078d2eb35acSNeilBrown 1079d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1080d2eb35acSNeilBrown 1081d2eb35acSNeilBrown r1_bio->master_bio = bio; 1082d2eb35acSNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 1083d2eb35acSNeilBrown r1_bio->state = 0; 1084d2eb35acSNeilBrown r1_bio->mddev = mddev; 1085d2eb35acSNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 1086d2eb35acSNeilBrown goto read_again; 1087d2eb35acSNeilBrown } else 10881da177e4SLinus Torvalds generic_make_request(read_bio); 10895a7bbad2SChristoph Hellwig return; 10901da177e4SLinus Torvalds } 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds /* 10931da177e4SLinus Torvalds * WRITE: 10941da177e4SLinus Torvalds */ 109534db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 109634db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 109734db0cd6SNeilBrown wait_event(conf->wait_barrier, 109834db0cd6SNeilBrown conf->pending_count < max_queued_requests); 109934db0cd6SNeilBrown } 11001f68f0c4SNeilBrown /* first select target devices under rcu_lock and 11011da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 11021da177e4SLinus Torvalds * bios[x] to bio 11031f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 11041f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 11051f68f0c4SNeilBrown * blocks. 11061f68f0c4SNeilBrown * This potentially requires several writes to write around 11071f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 11081f68f0c4SNeilBrown * with a set of bios attached. 11091da177e4SLinus Torvalds */ 1110c3b328acSNeilBrown 11118f19ccb2SNeilBrown disks = conf->raid_disks * 2; 11126bfe0b49SDan Williams retry_write: 11136bfe0b49SDan Williams blocked_rdev = NULL; 11141da177e4SLinus Torvalds rcu_read_lock(); 11151f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 11161da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 11173cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 11186bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 11196bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 11206bfe0b49SDan Williams blocked_rdev = rdev; 11216bfe0b49SDan Williams break; 11226bfe0b49SDan Williams } 11231da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 11246b740b8dSNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags) 11256b740b8dSNeilBrown || test_bit(Unmerged, &rdev->flags)) { 11268f19ccb2SNeilBrown if (i < conf->raid_disks) 11271f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 11281f68f0c4SNeilBrown continue; 1129964147d5SNeilBrown } 11301f68f0c4SNeilBrown 11311f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 11321f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 11331f68f0c4SNeilBrown sector_t first_bad; 11341f68f0c4SNeilBrown int bad_sectors; 11351f68f0c4SNeilBrown int is_bad; 11361f68f0c4SNeilBrown 11371f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 11381f68f0c4SNeilBrown max_sectors, 11391f68f0c4SNeilBrown &first_bad, &bad_sectors); 11401f68f0c4SNeilBrown if (is_bad < 0) { 11411f68f0c4SNeilBrown /* mustn't write here until the bad block is 11421f68f0c4SNeilBrown * acknowledged*/ 11431f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 11441f68f0c4SNeilBrown blocked_rdev = rdev; 11451f68f0c4SNeilBrown break; 11461f68f0c4SNeilBrown } 11471f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 11481f68f0c4SNeilBrown /* Cannot write here at all */ 11491f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 11501f68f0c4SNeilBrown if (bad_sectors < max_sectors) 11511f68f0c4SNeilBrown /* mustn't write more than bad_sectors 11521f68f0c4SNeilBrown * to other devices yet 11531f68f0c4SNeilBrown */ 11541f68f0c4SNeilBrown max_sectors = bad_sectors; 11551f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 11561f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 11571f68f0c4SNeilBrown * only applies if the disk is 11581f68f0c4SNeilBrown * missing, so it might be re-added, 11591f68f0c4SNeilBrown * and we want to know to recover this 11601f68f0c4SNeilBrown * chunk. 11611f68f0c4SNeilBrown * In this case the device is here, 11621f68f0c4SNeilBrown * and the fact that this chunk is not 11631f68f0c4SNeilBrown * in-sync is recorded in the bad 11641f68f0c4SNeilBrown * block log 11651f68f0c4SNeilBrown */ 11661f68f0c4SNeilBrown continue; 11671f68f0c4SNeilBrown } 11681f68f0c4SNeilBrown if (is_bad) { 11691f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 11701f68f0c4SNeilBrown if (good_sectors < max_sectors) 11711f68f0c4SNeilBrown max_sectors = good_sectors; 11721f68f0c4SNeilBrown } 11731f68f0c4SNeilBrown } 11741f68f0c4SNeilBrown r1_bio->bios[i] = bio; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds rcu_read_unlock(); 11771da177e4SLinus Torvalds 11786bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 11796bfe0b49SDan Williams /* Wait for this device to become unblocked */ 11806bfe0b49SDan Williams int j; 11816bfe0b49SDan Williams 11826bfe0b49SDan Williams for (j = 0; j < i; j++) 11836bfe0b49SDan Williams if (r1_bio->bios[j]) 11846bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 11851f68f0c4SNeilBrown r1_bio->state = 0; 11866bfe0b49SDan Williams allow_barrier(conf); 11876bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 11886bfe0b49SDan Williams wait_barrier(conf); 11896bfe0b49SDan Williams goto retry_write; 11906bfe0b49SDan Williams } 11916bfe0b49SDan Williams 11921f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 11931f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 11941f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 11951f68f0c4SNeilBrown */ 11961f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 11971f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 11981f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 11991f68f0c4SNeilBrown bio->bi_phys_segments = 2; 12001f68f0c4SNeilBrown else 12011f68f0c4SNeilBrown bio->bi_phys_segments++; 12021f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1203191ea9b2SNeilBrown } 12041f68f0c4SNeilBrown sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; 12054b6d287fSNeilBrown 12064e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 12074b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1208191ea9b2SNeilBrown 12091f68f0c4SNeilBrown first_clone = 1; 12101da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 12111da177e4SLinus Torvalds struct bio *mbio; 12121da177e4SLinus Torvalds if (!r1_bio->bios[i]) 12131da177e4SLinus Torvalds continue; 12141da177e4SLinus Torvalds 1215a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 12161f68f0c4SNeilBrown md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); 12171da177e4SLinus Torvalds 12181f68f0c4SNeilBrown if (first_clone) { 12191f68f0c4SNeilBrown /* do behind I/O ? 12201f68f0c4SNeilBrown * Not if there are too many, or cannot 12211f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 12221f68f0c4SNeilBrown * is waiting for behind writes to flush */ 12231f68f0c4SNeilBrown if (bitmap && 12241f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 12251f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 12261f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 12271f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 12281da177e4SLinus Torvalds 12291f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 12301f68f0c4SNeilBrown r1_bio->sectors, 12311f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 12321f68f0c4SNeilBrown &r1_bio->state)); 12331f68f0c4SNeilBrown first_clone = 0; 12341f68f0c4SNeilBrown } 12352ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 12364b6d287fSNeilBrown struct bio_vec *bvec; 12374b6d287fSNeilBrown int j; 12384b6d287fSNeilBrown 12394b6d287fSNeilBrown /* Yes, I really want the '__' version so that 12404b6d287fSNeilBrown * we clear any unused pointer in the io_vec, rather 12414b6d287fSNeilBrown * than leave them unchanged. This is important 12424b6d287fSNeilBrown * because when we come to free the pages, we won't 1243046abeedSNeilBrown * know the original bi_idx, so we just free 12444b6d287fSNeilBrown * them all 12454b6d287fSNeilBrown */ 12464b6d287fSNeilBrown __bio_for_each_segment(bvec, mbio, j, 0) 12472ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 12484b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 12494b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 12504b6d287fSNeilBrown } 12514b6d287fSNeilBrown 12521f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 12531f68f0c4SNeilBrown 12541f68f0c4SNeilBrown mbio->bi_sector = (r1_bio->sector + 12551f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 12561f68f0c4SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 12571f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 12581f68f0c4SNeilBrown mbio->bi_rw = WRITE | do_flush_fua | do_sync; 12591f68f0c4SNeilBrown mbio->bi_private = r1_bio; 12601f68f0c4SNeilBrown 12611da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1262191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 12634e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 126434db0cd6SNeilBrown conf->pending_count++; 1265191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1266b357f04aSNeilBrown if (!mddev_check_plugged(mddev)) 1267b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 12684e78064fSNeilBrown } 1269079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1270079fa166SNeilBrown * as it could result in the bio being freed. 1271079fa166SNeilBrown */ 12721f68f0c4SNeilBrown if (sectors_handled < (bio->bi_size >> 9)) { 1273079fa166SNeilBrown r1_bio_write_done(r1_bio); 12741f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 12751f68f0c4SNeilBrown * in bio->bi_phys_segments 12761f68f0c4SNeilBrown */ 12771f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 12781f68f0c4SNeilBrown r1_bio->master_bio = bio; 12791f68f0c4SNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 12801f68f0c4SNeilBrown r1_bio->state = 0; 12811f68f0c4SNeilBrown r1_bio->mddev = mddev; 12821f68f0c4SNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 12831f68f0c4SNeilBrown goto retry_write; 12841f68f0c4SNeilBrown } 12851f68f0c4SNeilBrown 1286079fa166SNeilBrown r1_bio_write_done(r1_bio); 1287079fa166SNeilBrown 1288079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1289079fa166SNeilBrown wake_up(&conf->wait_barrier); 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 1292fd01b88cSNeilBrown static void status(struct seq_file *seq, struct mddev *mddev) 12931da177e4SLinus Torvalds { 1294e8096360SNeilBrown struct r1conf *conf = mddev->private; 12951da177e4SLinus Torvalds int i; 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 129811ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1299ddac7c7eSNeilBrown rcu_read_lock(); 1300ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 13013cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 13021da177e4SLinus Torvalds seq_printf(seq, "%s", 1303ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1304ddac7c7eSNeilBrown } 1305ddac7c7eSNeilBrown rcu_read_unlock(); 13061da177e4SLinus Torvalds seq_printf(seq, "]"); 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds 1310fd01b88cSNeilBrown static void error(struct mddev *mddev, struct md_rdev *rdev) 13111da177e4SLinus Torvalds { 13121da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1313e8096360SNeilBrown struct r1conf *conf = mddev->private; 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds /* 13161da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 13171da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 13181da177e4SLinus Torvalds * next level up know. 13191da177e4SLinus Torvalds * else mark the drive as failed 13201da177e4SLinus Torvalds */ 1321b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 13224044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 13231da177e4SLinus Torvalds /* 13241da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 13254044ba58SNeilBrown * normal single drive. 13264044ba58SNeilBrown * However don't try a recovery from this drive as 13274044ba58SNeilBrown * it is very likely to fail. 13281da177e4SLinus Torvalds */ 13295389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 13301da177e4SLinus Torvalds return; 13314044ba58SNeilBrown } 1332de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1333c04be0aaSNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 1334c04be0aaSNeilBrown unsigned long flags; 1335c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 13361da177e4SLinus Torvalds mddev->degraded++; 1337dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1338c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 13391da177e4SLinus Torvalds /* 13401da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 13411da177e4SLinus Torvalds */ 1342dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1343dd00a99eSNeilBrown } else 1344b2d444d7SNeilBrown set_bit(Faulty, &rdev->flags); 1345850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 1346067032bcSJoe Perches printk(KERN_ALERT 1347067032bcSJoe Perches "md/raid1:%s: Disk failure on %s, disabling device.\n" 1348067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 13499dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 13509dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 13511da177e4SLinus Torvalds } 13521da177e4SLinus Torvalds 1353e8096360SNeilBrown static void print_conf(struct r1conf *conf) 13541da177e4SLinus Torvalds { 13551da177e4SLinus Torvalds int i; 13561da177e4SLinus Torvalds 13579dd1e2faSNeilBrown printk(KERN_DEBUG "RAID1 conf printout:\n"); 13581da177e4SLinus Torvalds if (!conf) { 13599dd1e2faSNeilBrown printk(KERN_DEBUG "(!conf)\n"); 13601da177e4SLinus Torvalds return; 13611da177e4SLinus Torvalds } 13629dd1e2faSNeilBrown printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 13631da177e4SLinus Torvalds conf->raid_disks); 13641da177e4SLinus Torvalds 1365ddac7c7eSNeilBrown rcu_read_lock(); 13661da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 13671da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 13683cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1369ddac7c7eSNeilBrown if (rdev) 13709dd1e2faSNeilBrown printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", 1371ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1372ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1373ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 13741da177e4SLinus Torvalds } 1375ddac7c7eSNeilBrown rcu_read_unlock(); 13761da177e4SLinus Torvalds } 13771da177e4SLinus Torvalds 1378e8096360SNeilBrown static void close_sync(struct r1conf *conf) 13791da177e4SLinus Torvalds { 138017999be4SNeilBrown wait_barrier(conf); 138117999be4SNeilBrown allow_barrier(conf); 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 13841da177e4SLinus Torvalds conf->r1buf_pool = NULL; 13851da177e4SLinus Torvalds } 13861da177e4SLinus Torvalds 1387fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 13881da177e4SLinus Torvalds { 13891da177e4SLinus Torvalds int i; 1390e8096360SNeilBrown struct r1conf *conf = mddev->private; 13916b965620SNeilBrown int count = 0; 13926b965620SNeilBrown unsigned long flags; 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds /* 13951da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1396ddac7c7eSNeilBrown * and mark them readable. 1397ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 13981da177e4SLinus Torvalds */ 13991da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 14003cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 14018c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 14028c7a2c2bSNeilBrown if (repl 14038c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 14048c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 14058c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 14068c7a2c2bSNeilBrown /* replacement has just become active */ 14078c7a2c2bSNeilBrown if (!rdev || 14088c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 14098c7a2c2bSNeilBrown count++; 14108c7a2c2bSNeilBrown if (rdev) { 14118c7a2c2bSNeilBrown /* Replaced device not technically 14128c7a2c2bSNeilBrown * faulty, but we need to be sure 14138c7a2c2bSNeilBrown * it gets removed and never re-added 14148c7a2c2bSNeilBrown */ 14158c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 14168c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 14178c7a2c2bSNeilBrown rdev->sysfs_state); 14188c7a2c2bSNeilBrown } 14198c7a2c2bSNeilBrown } 1420ddac7c7eSNeilBrown if (rdev 1421ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1422c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 14236b965620SNeilBrown count++; 1424654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 14251da177e4SLinus Torvalds } 14261da177e4SLinus Torvalds } 14276b965620SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 14286b965620SNeilBrown mddev->degraded -= count; 14296b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 14301da177e4SLinus Torvalds 14311da177e4SLinus Torvalds print_conf(conf); 14326b965620SNeilBrown return count; 14331da177e4SLinus Torvalds } 14341da177e4SLinus Torvalds 14351da177e4SLinus Torvalds 1436fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 14371da177e4SLinus Torvalds { 1438e8096360SNeilBrown struct r1conf *conf = mddev->private; 1439199050eaSNeil Brown int err = -EEXIST; 144041158c7eSNeilBrown int mirror = 0; 14410eaf822cSJonathan Brassow struct raid1_info *p; 14426c2fce2eSNeil Brown int first = 0; 144330194636SNeilBrown int last = conf->raid_disks - 1; 14446b740b8dSNeilBrown struct request_queue *q = bdev_get_queue(rdev->bdev); 14451da177e4SLinus Torvalds 14465389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 14475389042fSNeilBrown return -EBUSY; 14485389042fSNeilBrown 14496c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 14506c2fce2eSNeil Brown first = last = rdev->raid_disk; 14516c2fce2eSNeil Brown 14526b740b8dSNeilBrown if (q->merge_bvec_fn) { 14536b740b8dSNeilBrown set_bit(Unmerged, &rdev->flags); 14546b740b8dSNeilBrown mddev->merge_check_needed = 1; 14556b740b8dSNeilBrown } 14566b740b8dSNeilBrown 14577ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 14587ef449d1SNeilBrown p = conf->mirrors+mirror; 14597ef449d1SNeilBrown if (!p->rdev) { 14601da177e4SLinus Torvalds 14618f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 14628f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds p->head_position = 0; 14651da177e4SLinus Torvalds rdev->raid_disk = mirror; 1466199050eaSNeil Brown err = 0; 14676aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 14686aea114aSNeilBrown * if this was recently any drive of the array 14696aea114aSNeilBrown */ 14706aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 147141158c7eSNeilBrown conf->fullsync = 1; 1472d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 14731da177e4SLinus Torvalds break; 14741da177e4SLinus Torvalds } 14757ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 14767ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 14777ef449d1SNeilBrown /* Add this device as a replacement */ 14787ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 14797ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 14807ef449d1SNeilBrown rdev->raid_disk = mirror; 14817ef449d1SNeilBrown err = 0; 14827ef449d1SNeilBrown conf->fullsync = 1; 14837ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 14847ef449d1SNeilBrown break; 14857ef449d1SNeilBrown } 14867ef449d1SNeilBrown } 14876b740b8dSNeilBrown if (err == 0 && test_bit(Unmerged, &rdev->flags)) { 14886b740b8dSNeilBrown /* Some requests might not have seen this new 14896b740b8dSNeilBrown * merge_bvec_fn. We must wait for them to complete 14906b740b8dSNeilBrown * before merging the device fully. 14916b740b8dSNeilBrown * First we make sure any code which has tested 14926b740b8dSNeilBrown * our function has submitted the request, then 14936b740b8dSNeilBrown * we wait for all outstanding requests to complete. 14946b740b8dSNeilBrown */ 14956b740b8dSNeilBrown synchronize_sched(); 14966b740b8dSNeilBrown raise_barrier(conf); 14976b740b8dSNeilBrown lower_barrier(conf); 14986b740b8dSNeilBrown clear_bit(Unmerged, &rdev->flags); 14996b740b8dSNeilBrown } 1500ac5e7113SAndre Noll md_integrity_add_rdev(rdev, mddev); 15011da177e4SLinus Torvalds print_conf(conf); 1502199050eaSNeil Brown return err; 15031da177e4SLinus Torvalds } 15041da177e4SLinus Torvalds 1505b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 15061da177e4SLinus Torvalds { 1507e8096360SNeilBrown struct r1conf *conf = mddev->private; 15081da177e4SLinus Torvalds int err = 0; 1509b8321b68SNeilBrown int number = rdev->raid_disk; 15100eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 15111da177e4SLinus Torvalds 1512b014f14cSNeilBrown if (rdev != p->rdev) 1513b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1514b014f14cSNeilBrown 15151da177e4SLinus Torvalds print_conf(conf); 1516b8321b68SNeilBrown if (rdev == p->rdev) { 1517b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 15181da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 15191da177e4SLinus Torvalds err = -EBUSY; 15201da177e4SLinus Torvalds goto abort; 15211da177e4SLinus Torvalds } 1522046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1523dfc70645SNeilBrown * is not possible. 1524dfc70645SNeilBrown */ 1525dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 15265389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1527dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1528dfc70645SNeilBrown err = -EBUSY; 1529dfc70645SNeilBrown goto abort; 1530dfc70645SNeilBrown } 15311da177e4SLinus Torvalds p->rdev = NULL; 1532fbd568a3SPaul E. McKenney synchronize_rcu(); 15331da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 15341da177e4SLinus Torvalds /* lost the race, try later */ 15351da177e4SLinus Torvalds err = -EBUSY; 15361da177e4SLinus Torvalds p->rdev = rdev; 1537ac5e7113SAndre Noll goto abort; 15388c7a2c2bSNeilBrown } else if (conf->mirrors[conf->raid_disks + number].rdev) { 15398c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 15408c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 15418c7a2c2bSNeilBrown * doing this to avoid confusion. 15428c7a2c2bSNeilBrown */ 15438c7a2c2bSNeilBrown struct md_rdev *repl = 15448c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 15458c7a2c2bSNeilBrown raise_barrier(conf); 15468c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 15478c7a2c2bSNeilBrown p->rdev = repl; 15488c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 15498c7a2c2bSNeilBrown lower_barrier(conf); 1550b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 15518c7a2c2bSNeilBrown } else 15528c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1553a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 15541da177e4SLinus Torvalds } 15551da177e4SLinus Torvalds abort: 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds print_conf(conf); 15581da177e4SLinus Torvalds return err; 15591da177e4SLinus Torvalds } 15601da177e4SLinus Torvalds 15611da177e4SLinus Torvalds 15626712ecf8SNeilBrown static void end_sync_read(struct bio *bio, int error) 15631da177e4SLinus Torvalds { 15649f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 15651da177e4SLinus Torvalds 15660fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1567ba3ae3beSNamhyung Kim 15681da177e4SLinus Torvalds /* 15691da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 15701da177e4SLinus Torvalds * or re-read if the read failed. 15711da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 15721da177e4SLinus Torvalds */ 157369382e85SNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags)) 15741da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1575d11c171eSNeilBrown 1576d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 15771da177e4SLinus Torvalds reschedule_retry(r1_bio); 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 15806712ecf8SNeilBrown static void end_sync_write(struct bio *bio, int error) 15811da177e4SLinus Torvalds { 15821da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 15839f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1584fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1585e8096360SNeilBrown struct r1conf *conf = mddev->private; 15861da177e4SLinus Torvalds int mirror=0; 15874367af55SNeilBrown sector_t first_bad; 15884367af55SNeilBrown int bad_sectors; 15891da177e4SLinus Torvalds 1590ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 1591ba3ae3beSNamhyung Kim 15926b1117d5SNeilBrown if (!uptodate) { 159357dab0bdSNeilBrown sector_t sync_blocks = 0; 15946b1117d5SNeilBrown sector_t s = r1_bio->sector; 15956b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 15966b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 15976b1117d5SNeilBrown do { 15985e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 15996b1117d5SNeilBrown &sync_blocks, 1); 16006b1117d5SNeilBrown s += sync_blocks; 16016b1117d5SNeilBrown sectors_to_go -= sync_blocks; 16026b1117d5SNeilBrown } while (sectors_to_go > 0); 1603d8f05d29SNeilBrown set_bit(WriteErrorSeen, 1604d8f05d29SNeilBrown &conf->mirrors[mirror].rdev->flags); 160519d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 160619d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 160719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 160819d67169SNeilBrown mddev->recovery); 1609d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 16104367af55SNeilBrown } else if (is_badblock(conf->mirrors[mirror].rdev, 16114367af55SNeilBrown r1_bio->sector, 16124367af55SNeilBrown r1_bio->sectors, 16133a9f28a5SNeilBrown &first_bad, &bad_sectors) && 16143a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 16153a9f28a5SNeilBrown r1_bio->sector, 16163a9f28a5SNeilBrown r1_bio->sectors, 16173a9f28a5SNeilBrown &first_bad, &bad_sectors) 16183a9f28a5SNeilBrown ) 16194367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1620e3b9703eSNeilBrown 16211da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 16224367af55SNeilBrown int s = r1_bio->sectors; 1623d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1624d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 16254367af55SNeilBrown reschedule_retry(r1_bio); 16264367af55SNeilBrown else { 16271da177e4SLinus Torvalds put_buf(r1_bio); 162873d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 16291da177e4SLinus Torvalds } 16301da177e4SLinus Torvalds } 16314367af55SNeilBrown } 16321da177e4SLinus Torvalds 16333cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1634d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1635d8f05d29SNeilBrown { 1636d8f05d29SNeilBrown if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1637d8f05d29SNeilBrown /* success */ 1638d8f05d29SNeilBrown return 1; 163919d67169SNeilBrown if (rw == WRITE) { 1640d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 164119d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 164219d67169SNeilBrown &rdev->flags)) 164319d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 164419d67169SNeilBrown rdev->mddev->recovery); 164519d67169SNeilBrown } 1646d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1647d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1648d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1649d8f05d29SNeilBrown return 0; 1650d8f05d29SNeilBrown } 1651d8f05d29SNeilBrown 16529f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 16531da177e4SLinus Torvalds { 1654a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 165569382e85SNeilBrown * good data, much like with normal read errors. Only 1656ddac7c7eSNeilBrown * read into the pages we already have so we don't 165769382e85SNeilBrown * need to re-issue the read request. 165869382e85SNeilBrown * We don't need to freeze the array, because being in an 165969382e85SNeilBrown * active sync request, there is no normal IO, and 166069382e85SNeilBrown * no overlapping syncs. 166106f60385SNeilBrown * We don't need to check is_badblock() again as we 166206f60385SNeilBrown * made sure that anything with a bad block in range 166306f60385SNeilBrown * will have bi_end_io clear. 16641da177e4SLinus Torvalds */ 1665fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1666e8096360SNeilBrown struct r1conf *conf = mddev->private; 1667a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 166869382e85SNeilBrown sector_t sect = r1_bio->sector; 166969382e85SNeilBrown int sectors = r1_bio->sectors; 167069382e85SNeilBrown int idx = 0; 167169382e85SNeilBrown 167269382e85SNeilBrown while(sectors) { 167369382e85SNeilBrown int s = sectors; 167469382e85SNeilBrown int d = r1_bio->read_disk; 167569382e85SNeilBrown int success = 0; 16763cb03002SNeilBrown struct md_rdev *rdev; 167778d7f5f7SNeilBrown int start; 167869382e85SNeilBrown 167969382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 168069382e85SNeilBrown s = PAGE_SIZE >> 9; 168169382e85SNeilBrown do { 168269382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1683ddac7c7eSNeilBrown /* No rcu protection needed here devices 1684ddac7c7eSNeilBrown * can only be removed when no resync is 1685ddac7c7eSNeilBrown * active, and resync is currently active 1686ddac7c7eSNeilBrown */ 168769382e85SNeilBrown rdev = conf->mirrors[d].rdev; 16889d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 168969382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1690ccebd4c4SJonathan Brassow READ, false)) { 169169382e85SNeilBrown success = 1; 169269382e85SNeilBrown break; 169369382e85SNeilBrown } 169469382e85SNeilBrown } 169569382e85SNeilBrown d++; 16968f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 169769382e85SNeilBrown d = 0; 169869382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 169969382e85SNeilBrown 170078d7f5f7SNeilBrown if (!success) { 170178d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 17023a9f28a5SNeilBrown int abort = 0; 17033a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 17043a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 17053a9f28a5SNeilBrown * work just disable and interrupt the recovery. 17063a9f28a5SNeilBrown * Don't fail devices as that won't really help. 17073a9f28a5SNeilBrown */ 170878d7f5f7SNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" 170978d7f5f7SNeilBrown " for block %llu\n", 171078d7f5f7SNeilBrown mdname(mddev), 171178d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 171278d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 17138f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 17143a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 17153a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 17163a9f28a5SNeilBrown continue; 17173a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 17183a9f28a5SNeilBrown abort = 1; 17193a9f28a5SNeilBrown } 17203a9f28a5SNeilBrown if (abort) { 1721d890fa2bSNeilBrown conf->recovery_disabled = 1722d890fa2bSNeilBrown mddev->recovery_disabled; 17233a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 172478d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 172578d7f5f7SNeilBrown put_buf(r1_bio); 172678d7f5f7SNeilBrown return 0; 172778d7f5f7SNeilBrown } 17283a9f28a5SNeilBrown /* Try next page */ 17293a9f28a5SNeilBrown sectors -= s; 17303a9f28a5SNeilBrown sect += s; 17313a9f28a5SNeilBrown idx++; 17323a9f28a5SNeilBrown continue; 17333a9f28a5SNeilBrown } 173478d7f5f7SNeilBrown 173578d7f5f7SNeilBrown start = d; 173669382e85SNeilBrown /* write it back and re-read */ 173769382e85SNeilBrown while (d != r1_bio->read_disk) { 173869382e85SNeilBrown if (d == 0) 17398f19ccb2SNeilBrown d = conf->raid_disks * 2; 174069382e85SNeilBrown d--; 174169382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 174269382e85SNeilBrown continue; 174369382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1744d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 174569382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1746d8f05d29SNeilBrown WRITE) == 0) { 174778d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 174878d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 17499d3d8011SNamhyung Kim } 1750097426f6SNeilBrown } 1751097426f6SNeilBrown d = start; 1752097426f6SNeilBrown while (d != r1_bio->read_disk) { 1753097426f6SNeilBrown if (d == 0) 17548f19ccb2SNeilBrown d = conf->raid_disks * 2; 1755097426f6SNeilBrown d--; 1756097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1757097426f6SNeilBrown continue; 1758097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1759d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 176069382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1761d8f05d29SNeilBrown READ) != 0) 17629d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 176369382e85SNeilBrown } 176469382e85SNeilBrown sectors -= s; 176569382e85SNeilBrown sect += s; 176669382e85SNeilBrown idx ++; 176769382e85SNeilBrown } 176878d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 17697ca78d57SNeilBrown set_bit(BIO_UPTODATE, &bio->bi_flags); 1770a68e5870SNeilBrown return 1; 177169382e85SNeilBrown } 1772d11c171eSNeilBrown 17739f2c9d12SNeilBrown static int process_checks(struct r1bio *r1_bio) 1774a68e5870SNeilBrown { 1775a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1776a68e5870SNeilBrown * got the block, then there is no hope left. 1777a68e5870SNeilBrown * If we have, then we want to do a comparison 1778a68e5870SNeilBrown * and skip the write if everything is the same. 1779a68e5870SNeilBrown * If any blocks failed to read, then we need to 1780a68e5870SNeilBrown * attempt an over-write 1781a68e5870SNeilBrown */ 1782fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1783e8096360SNeilBrown struct r1conf *conf = mddev->private; 1784a68e5870SNeilBrown int primary; 1785a68e5870SNeilBrown int i; 1786f4380a91Smajianpeng int vcnt; 1787a68e5870SNeilBrown 17888f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 1789a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 1790a68e5870SNeilBrown test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { 1791a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1792a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1793a68e5870SNeilBrown break; 1794a68e5870SNeilBrown } 1795a68e5870SNeilBrown r1_bio->read_disk = primary; 1796f4380a91Smajianpeng vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 17978f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1798a68e5870SNeilBrown int j; 1799a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1800a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 180178d7f5f7SNeilBrown int size; 180278d7f5f7SNeilBrown 180378d7f5f7SNeilBrown if (r1_bio->bios[i]->bi_end_io != end_sync_read) 180478d7f5f7SNeilBrown continue; 1805a68e5870SNeilBrown 1806a68e5870SNeilBrown if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { 1807a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1808a68e5870SNeilBrown struct page *p, *s; 1809a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1810a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1811a68e5870SNeilBrown if (memcmp(page_address(p), 1812a68e5870SNeilBrown page_address(s), 18135020ad7dSNeilBrown sbio->bi_io_vec[j].bv_len)) 1814a68e5870SNeilBrown break; 1815a68e5870SNeilBrown } 1816a68e5870SNeilBrown } else 1817a68e5870SNeilBrown j = 0; 1818a68e5870SNeilBrown if (j >= 0) 1819a68e5870SNeilBrown mddev->resync_mismatches += r1_bio->sectors; 1820a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 1821a68e5870SNeilBrown && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { 182278d7f5f7SNeilBrown /* No need to write to this device. */ 1823a68e5870SNeilBrown sbio->bi_end_io = NULL; 1824a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 182578d7f5f7SNeilBrown continue; 182678d7f5f7SNeilBrown } 1827a68e5870SNeilBrown /* fixup the bio for reuse */ 1828a68e5870SNeilBrown sbio->bi_vcnt = vcnt; 1829a68e5870SNeilBrown sbio->bi_size = r1_bio->sectors << 9; 1830a68e5870SNeilBrown sbio->bi_idx = 0; 1831a68e5870SNeilBrown sbio->bi_phys_segments = 0; 1832a68e5870SNeilBrown sbio->bi_flags &= ~(BIO_POOL_MASK - 1); 1833a68e5870SNeilBrown sbio->bi_flags |= 1 << BIO_UPTODATE; 1834a68e5870SNeilBrown sbio->bi_next = NULL; 1835a68e5870SNeilBrown sbio->bi_sector = r1_bio->sector + 1836a68e5870SNeilBrown conf->mirrors[i].rdev->data_offset; 1837a68e5870SNeilBrown sbio->bi_bdev = conf->mirrors[i].rdev->bdev; 1838a68e5870SNeilBrown size = sbio->bi_size; 1839a68e5870SNeilBrown for (j = 0; j < vcnt ; j++) { 1840a68e5870SNeilBrown struct bio_vec *bi; 1841a68e5870SNeilBrown bi = &sbio->bi_io_vec[j]; 1842a68e5870SNeilBrown bi->bv_offset = 0; 1843a68e5870SNeilBrown if (size > PAGE_SIZE) 1844a68e5870SNeilBrown bi->bv_len = PAGE_SIZE; 1845a68e5870SNeilBrown else 1846a68e5870SNeilBrown bi->bv_len = size; 1847a68e5870SNeilBrown size -= PAGE_SIZE; 1848a68e5870SNeilBrown memcpy(page_address(bi->bv_page), 1849a68e5870SNeilBrown page_address(pbio->bi_io_vec[j].bv_page), 1850a68e5870SNeilBrown PAGE_SIZE); 1851a68e5870SNeilBrown } 1852a68e5870SNeilBrown } 1853a68e5870SNeilBrown return 0; 1854a68e5870SNeilBrown } 1855a68e5870SNeilBrown 18569f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 1857a68e5870SNeilBrown { 1858e8096360SNeilBrown struct r1conf *conf = mddev->private; 1859a68e5870SNeilBrown int i; 18608f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 1861a68e5870SNeilBrown struct bio *bio, *wbio; 1862a68e5870SNeilBrown 1863a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 1864a68e5870SNeilBrown 1865a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 1866a68e5870SNeilBrown /* ouch - failed to read all of that. */ 1867a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 1868a68e5870SNeilBrown return; 18697ca78d57SNeilBrown 18707ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 18717ca78d57SNeilBrown if (process_checks(r1_bio) < 0) 18727ca78d57SNeilBrown return; 1873d11c171eSNeilBrown /* 1874d11c171eSNeilBrown * schedule writes 1875d11c171eSNeilBrown */ 18761da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 18771da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 18781da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 18793e198f78SNeilBrown if (wbio->bi_end_io == NULL || 18803e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 18813e198f78SNeilBrown (i == r1_bio->read_disk || 18823e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 18831da177e4SLinus Torvalds continue; 18841da177e4SLinus Torvalds 18853e198f78SNeilBrown wbio->bi_rw = WRITE; 18863e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 18871da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 18881da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 1889191ea9b2SNeilBrown 18901da177e4SLinus Torvalds generic_make_request(wbio); 18911da177e4SLinus Torvalds } 18921da177e4SLinus Torvalds 18931da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 1894191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 189558e94ae1SNeilBrown int s = r1_bio->sectors; 189658e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 189758e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 189858e94ae1SNeilBrown reschedule_retry(r1_bio); 189958e94ae1SNeilBrown else { 19001da177e4SLinus Torvalds put_buf(r1_bio); 190158e94ae1SNeilBrown md_done_sync(mddev, s, 1); 190258e94ae1SNeilBrown } 19031da177e4SLinus Torvalds } 19041da177e4SLinus Torvalds } 19051da177e4SLinus Torvalds 19061da177e4SLinus Torvalds /* 19071da177e4SLinus Torvalds * This is a kernel thread which: 19081da177e4SLinus Torvalds * 19091da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 19101da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 1911d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 19121da177e4SLinus Torvalds */ 19131da177e4SLinus Torvalds 1914e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 1915867868fbSNeilBrown sector_t sect, int sectors) 1916867868fbSNeilBrown { 1917fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 1918867868fbSNeilBrown while(sectors) { 1919867868fbSNeilBrown int s = sectors; 1920867868fbSNeilBrown int d = read_disk; 1921867868fbSNeilBrown int success = 0; 1922867868fbSNeilBrown int start; 19233cb03002SNeilBrown struct md_rdev *rdev; 1924867868fbSNeilBrown 1925867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 1926867868fbSNeilBrown s = PAGE_SIZE >> 9; 1927867868fbSNeilBrown 1928867868fbSNeilBrown do { 1929867868fbSNeilBrown /* Note: no rcu protection needed here 1930867868fbSNeilBrown * as this is synchronous in the raid1d thread 1931867868fbSNeilBrown * which is the thread that might remove 1932867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 1933867868fbSNeilBrown */ 1934d2eb35acSNeilBrown sector_t first_bad; 1935d2eb35acSNeilBrown int bad_sectors; 1936d2eb35acSNeilBrown 1937867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1938867868fbSNeilBrown if (rdev && 1939da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 1940da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 1941da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 1942d2eb35acSNeilBrown is_badblock(rdev, sect, s, 1943d2eb35acSNeilBrown &first_bad, &bad_sectors) == 0 && 1944ccebd4c4SJonathan Brassow sync_page_io(rdev, sect, s<<9, 1945ccebd4c4SJonathan Brassow conf->tmppage, READ, false)) 1946867868fbSNeilBrown success = 1; 1947867868fbSNeilBrown else { 1948867868fbSNeilBrown d++; 19498f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 1950867868fbSNeilBrown d = 0; 1951867868fbSNeilBrown } 1952867868fbSNeilBrown } while (!success && d != read_disk); 1953867868fbSNeilBrown 1954867868fbSNeilBrown if (!success) { 1955d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 19563cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 1957d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 1958d8f05d29SNeilBrown md_error(mddev, rdev); 1959867868fbSNeilBrown break; 1960867868fbSNeilBrown } 1961867868fbSNeilBrown /* write it back and re-read */ 1962867868fbSNeilBrown start = d; 1963867868fbSNeilBrown while (d != read_disk) { 1964867868fbSNeilBrown if (d==0) 19658f19ccb2SNeilBrown d = conf->raid_disks * 2; 1966867868fbSNeilBrown d--; 1967867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1968867868fbSNeilBrown if (rdev && 1969d8f05d29SNeilBrown test_bit(In_sync, &rdev->flags)) 1970d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 1971d8f05d29SNeilBrown conf->tmppage, WRITE); 1972867868fbSNeilBrown } 1973867868fbSNeilBrown d = start; 1974867868fbSNeilBrown while (d != read_disk) { 1975867868fbSNeilBrown char b[BDEVNAME_SIZE]; 1976867868fbSNeilBrown if (d==0) 19778f19ccb2SNeilBrown d = conf->raid_disks * 2; 1978867868fbSNeilBrown d--; 1979867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1980867868fbSNeilBrown if (rdev && 1981867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1982d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 1983d8f05d29SNeilBrown conf->tmppage, READ)) { 1984867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 1985867868fbSNeilBrown printk(KERN_INFO 19869dd1e2faSNeilBrown "md/raid1:%s: read error corrected " 1987867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 1988867868fbSNeilBrown mdname(mddev), s, 1989969b755aSRandy Dunlap (unsigned long long)(sect + 1990969b755aSRandy Dunlap rdev->data_offset), 1991867868fbSNeilBrown bdevname(rdev->bdev, b)); 1992867868fbSNeilBrown } 1993867868fbSNeilBrown } 1994867868fbSNeilBrown } 1995867868fbSNeilBrown sectors -= s; 1996867868fbSNeilBrown sect += s; 1997867868fbSNeilBrown } 1998867868fbSNeilBrown } 1999867868fbSNeilBrown 2000cd5ff9a1SNeilBrown static void bi_complete(struct bio *bio, int error) 2001cd5ff9a1SNeilBrown { 2002cd5ff9a1SNeilBrown complete((struct completion *)bio->bi_private); 2003cd5ff9a1SNeilBrown } 2004cd5ff9a1SNeilBrown 2005cd5ff9a1SNeilBrown static int submit_bio_wait(int rw, struct bio *bio) 2006cd5ff9a1SNeilBrown { 2007cd5ff9a1SNeilBrown struct completion event; 2008cd5ff9a1SNeilBrown rw |= REQ_SYNC; 2009cd5ff9a1SNeilBrown 2010cd5ff9a1SNeilBrown init_completion(&event); 2011cd5ff9a1SNeilBrown bio->bi_private = &event; 2012cd5ff9a1SNeilBrown bio->bi_end_io = bi_complete; 2013cd5ff9a1SNeilBrown submit_bio(rw, bio); 2014cd5ff9a1SNeilBrown wait_for_completion(&event); 2015cd5ff9a1SNeilBrown 2016cd5ff9a1SNeilBrown return test_bit(BIO_UPTODATE, &bio->bi_flags); 2017cd5ff9a1SNeilBrown } 2018cd5ff9a1SNeilBrown 20199f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2020cd5ff9a1SNeilBrown { 2021fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2022e8096360SNeilBrown struct r1conf *conf = mddev->private; 20233cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2024cd5ff9a1SNeilBrown int vcnt, idx; 2025cd5ff9a1SNeilBrown struct bio_vec *vec; 2026cd5ff9a1SNeilBrown 2027cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2028cd5ff9a1SNeilBrown * we just recently had a write error. 2029cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2030cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2031cd5ff9a1SNeilBrown * a bad block. 2032cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2033cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2034cd5ff9a1SNeilBrown * 2035cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2036cd5ff9a1SNeilBrown */ 2037cd5ff9a1SNeilBrown 2038cd5ff9a1SNeilBrown int block_sectors; 2039cd5ff9a1SNeilBrown sector_t sector; 2040cd5ff9a1SNeilBrown int sectors; 2041cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2042cd5ff9a1SNeilBrown int ok = 1; 2043cd5ff9a1SNeilBrown 2044cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2045cd5ff9a1SNeilBrown return 0; 2046cd5ff9a1SNeilBrown 2047cd5ff9a1SNeilBrown block_sectors = 1 << rdev->badblocks.shift; 2048cd5ff9a1SNeilBrown sector = r1_bio->sector; 2049cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2050cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2051cd5ff9a1SNeilBrown - sector; 2052cd5ff9a1SNeilBrown 2053cd5ff9a1SNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2054cd5ff9a1SNeilBrown vcnt = r1_bio->behind_page_count; 2055cd5ff9a1SNeilBrown vec = r1_bio->behind_bvecs; 2056cd5ff9a1SNeilBrown idx = 0; 2057cd5ff9a1SNeilBrown while (vec[idx].bv_page == NULL) 2058cd5ff9a1SNeilBrown idx++; 2059cd5ff9a1SNeilBrown } else { 2060cd5ff9a1SNeilBrown vcnt = r1_bio->master_bio->bi_vcnt; 2061cd5ff9a1SNeilBrown vec = r1_bio->master_bio->bi_io_vec; 2062cd5ff9a1SNeilBrown idx = r1_bio->master_bio->bi_idx; 2063cd5ff9a1SNeilBrown } 2064cd5ff9a1SNeilBrown while (sect_to_write) { 2065cd5ff9a1SNeilBrown struct bio *wbio; 2066cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2067cd5ff9a1SNeilBrown sectors = sect_to_write; 2068cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2069cd5ff9a1SNeilBrown 2070cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 2071cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 2072cd5ff9a1SNeilBrown wbio->bi_sector = r1_bio->sector; 2073cd5ff9a1SNeilBrown wbio->bi_rw = WRITE; 2074cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 2075cd5ff9a1SNeilBrown wbio->bi_size = r1_bio->sectors << 9; 2076cd5ff9a1SNeilBrown wbio->bi_idx = idx; 2077cd5ff9a1SNeilBrown 2078cd5ff9a1SNeilBrown md_trim_bio(wbio, sector - r1_bio->sector, sectors); 2079cd5ff9a1SNeilBrown wbio->bi_sector += rdev->data_offset; 2080cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 2081cd5ff9a1SNeilBrown if (submit_bio_wait(WRITE, wbio) == 0) 2082cd5ff9a1SNeilBrown /* failure! */ 2083cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2084cd5ff9a1SNeilBrown sectors, 0) 2085cd5ff9a1SNeilBrown && ok; 2086cd5ff9a1SNeilBrown 2087cd5ff9a1SNeilBrown bio_put(wbio); 2088cd5ff9a1SNeilBrown sect_to_write -= sectors; 2089cd5ff9a1SNeilBrown sector += sectors; 2090cd5ff9a1SNeilBrown sectors = block_sectors; 2091cd5ff9a1SNeilBrown } 2092cd5ff9a1SNeilBrown return ok; 2093cd5ff9a1SNeilBrown } 2094cd5ff9a1SNeilBrown 2095e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 209662096bceSNeilBrown { 209762096bceSNeilBrown int m; 209862096bceSNeilBrown int s = r1_bio->sectors; 20998f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 21003cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 210162096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 210262096bceSNeilBrown if (bio->bi_end_io == NULL) 210362096bceSNeilBrown continue; 210462096bceSNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags) && 210562096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2106c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 210762096bceSNeilBrown } 210862096bceSNeilBrown if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 210962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 211062096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 211162096bceSNeilBrown md_error(conf->mddev, rdev); 211262096bceSNeilBrown } 211362096bceSNeilBrown } 211462096bceSNeilBrown put_buf(r1_bio); 211562096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 211662096bceSNeilBrown } 211762096bceSNeilBrown 2118e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 211962096bceSNeilBrown { 212062096bceSNeilBrown int m; 21218f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 212262096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 21233cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 212462096bceSNeilBrown rdev_clear_badblocks(rdev, 212562096bceSNeilBrown r1_bio->sector, 2126c6563a8cSNeilBrown r1_bio->sectors, 0); 212762096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 212862096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 212962096bceSNeilBrown /* This drive got a write error. We need to 213062096bceSNeilBrown * narrow down and record precise write 213162096bceSNeilBrown * errors. 213262096bceSNeilBrown */ 213362096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 213462096bceSNeilBrown md_error(conf->mddev, 213562096bceSNeilBrown conf->mirrors[m].rdev); 213662096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 213762096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 213862096bceSNeilBrown } 213962096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 214062096bceSNeilBrown conf->mddev); 214162096bceSNeilBrown } 214262096bceSNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 214362096bceSNeilBrown close_write(r1_bio); 214462096bceSNeilBrown raid_end_bio_io(r1_bio); 214562096bceSNeilBrown } 214662096bceSNeilBrown 2147e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 214862096bceSNeilBrown { 214962096bceSNeilBrown int disk; 215062096bceSNeilBrown int max_sectors; 2151fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 215262096bceSNeilBrown struct bio *bio; 215362096bceSNeilBrown char b[BDEVNAME_SIZE]; 21543cb03002SNeilBrown struct md_rdev *rdev; 215562096bceSNeilBrown 215662096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 215762096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 215862096bceSNeilBrown * the block and we can fix it. 215962096bceSNeilBrown * We freeze all other IO, and try reading the block from 216062096bceSNeilBrown * other devices. When we find one, we re-write 216162096bceSNeilBrown * and check it that fixes the read error. 216262096bceSNeilBrown * This is all done synchronously while the array is 216362096bceSNeilBrown * frozen 216462096bceSNeilBrown */ 216562096bceSNeilBrown if (mddev->ro == 0) { 216662096bceSNeilBrown freeze_array(conf); 216762096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 216862096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 216962096bceSNeilBrown unfreeze_array(conf); 217062096bceSNeilBrown } else 217162096bceSNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 217262096bceSNeilBrown 217362096bceSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 217462096bceSNeilBrown bdevname(bio->bi_bdev, b); 217562096bceSNeilBrown read_more: 217662096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 217762096bceSNeilBrown if (disk == -1) { 217862096bceSNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" 217962096bceSNeilBrown " read error for block %llu\n", 218062096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 218162096bceSNeilBrown raid_end_bio_io(r1_bio); 218262096bceSNeilBrown } else { 218362096bceSNeilBrown const unsigned long do_sync 218462096bceSNeilBrown = r1_bio->master_bio->bi_rw & REQ_SYNC; 218562096bceSNeilBrown if (bio) { 218662096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = 218762096bceSNeilBrown mddev->ro ? IO_BLOCKED : NULL; 218862096bceSNeilBrown bio_put(bio); 218962096bceSNeilBrown } 219062096bceSNeilBrown r1_bio->read_disk = disk; 219162096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 219262096bceSNeilBrown md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); 219362096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 219462096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 219562096bceSNeilBrown printk_ratelimited(KERN_ERR 219662096bceSNeilBrown "md/raid1:%s: redirecting sector %llu" 219762096bceSNeilBrown " to other mirror: %s\n", 219862096bceSNeilBrown mdname(mddev), 219962096bceSNeilBrown (unsigned long long)r1_bio->sector, 220062096bceSNeilBrown bdevname(rdev->bdev, b)); 220162096bceSNeilBrown bio->bi_sector = r1_bio->sector + rdev->data_offset; 220262096bceSNeilBrown bio->bi_bdev = rdev->bdev; 220362096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 220462096bceSNeilBrown bio->bi_rw = READ | do_sync; 220562096bceSNeilBrown bio->bi_private = r1_bio; 220662096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 220762096bceSNeilBrown /* Drat - have to split this up more */ 220862096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 220962096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 221062096bceSNeilBrown - mbio->bi_sector); 221162096bceSNeilBrown r1_bio->sectors = max_sectors; 221262096bceSNeilBrown spin_lock_irq(&conf->device_lock); 221362096bceSNeilBrown if (mbio->bi_phys_segments == 0) 221462096bceSNeilBrown mbio->bi_phys_segments = 2; 221562096bceSNeilBrown else 221662096bceSNeilBrown mbio->bi_phys_segments++; 221762096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 221862096bceSNeilBrown generic_make_request(bio); 221962096bceSNeilBrown bio = NULL; 222062096bceSNeilBrown 222162096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 222262096bceSNeilBrown 222362096bceSNeilBrown r1_bio->master_bio = mbio; 222462096bceSNeilBrown r1_bio->sectors = (mbio->bi_size >> 9) 222562096bceSNeilBrown - sectors_handled; 222662096bceSNeilBrown r1_bio->state = 0; 222762096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 222862096bceSNeilBrown r1_bio->mddev = mddev; 222962096bceSNeilBrown r1_bio->sector = mbio->bi_sector + sectors_handled; 223062096bceSNeilBrown 223162096bceSNeilBrown goto read_more; 223262096bceSNeilBrown } else 223362096bceSNeilBrown generic_make_request(bio); 223462096bceSNeilBrown } 223562096bceSNeilBrown } 223662096bceSNeilBrown 2237fd01b88cSNeilBrown static void raid1d(struct mddev *mddev) 22381da177e4SLinus Torvalds { 22399f2c9d12SNeilBrown struct r1bio *r1_bio; 22401da177e4SLinus Torvalds unsigned long flags; 2241e8096360SNeilBrown struct r1conf *conf = mddev->private; 22421da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2243e1dfa0a2SNeilBrown struct blk_plug plug; 22441da177e4SLinus Torvalds 22451da177e4SLinus Torvalds md_check_recovery(mddev); 22461da177e4SLinus Torvalds 2247e1dfa0a2SNeilBrown blk_start_plug(&plug); 22481da177e4SLinus Torvalds for (;;) { 2249a35e63efSNeilBrown 2250c3b328acSNeilBrown if (atomic_read(&mddev->plug_cnt) == 0) 22517eaceaccSJens Axboe flush_pending_writes(conf); 2252a35e63efSNeilBrown 22531da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2254a35e63efSNeilBrown if (list_empty(head)) { 2255191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 22561da177e4SLinus Torvalds break; 2257a35e63efSNeilBrown } 22589f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 22591da177e4SLinus Torvalds list_del(head->prev); 2260ddaf22abSNeilBrown conf->nr_queued--; 22611da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 22621da177e4SLinus Torvalds 22631da177e4SLinus Torvalds mddev = r1_bio->mddev; 2264070ec55dSNeilBrown conf = mddev->private; 22654367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2266d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 226762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 226862096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 226962096bceSNeilBrown else 22701da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2271cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 227262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 227362096bceSNeilBrown handle_write_finished(conf, r1_bio); 227462096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 227562096bceSNeilBrown handle_read_error(conf, r1_bio); 2276d2eb35acSNeilBrown else 2277d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2278d2eb35acSNeilBrown * context 2279d2eb35acSNeilBrown */ 2280d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 228162096bceSNeilBrown 22821d9d5241SNeilBrown cond_resched(); 2283de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2284de393cdeSNeilBrown md_check_recovery(mddev); 22851da177e4SLinus Torvalds } 2286e1dfa0a2SNeilBrown blk_finish_plug(&plug); 22871da177e4SLinus Torvalds } 22881da177e4SLinus Torvalds 22891da177e4SLinus Torvalds 2290e8096360SNeilBrown static int init_resync(struct r1conf *conf) 22911da177e4SLinus Torvalds { 22921da177e4SLinus Torvalds int buffs; 22931da177e4SLinus Torvalds 22941da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 22959e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 22961da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 22971da177e4SLinus Torvalds conf->poolinfo); 22981da177e4SLinus Torvalds if (!conf->r1buf_pool) 22991da177e4SLinus Torvalds return -ENOMEM; 23001da177e4SLinus Torvalds conf->next_resync = 0; 23011da177e4SLinus Torvalds return 0; 23021da177e4SLinus Torvalds } 23031da177e4SLinus Torvalds 23041da177e4SLinus Torvalds /* 23051da177e4SLinus Torvalds * perform a "sync" on one "block" 23061da177e4SLinus Torvalds * 23071da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 23081da177e4SLinus Torvalds * requests - conflict with active sync requests. 23091da177e4SLinus Torvalds * 23101da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 23111da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 23121da177e4SLinus Torvalds */ 23131da177e4SLinus Torvalds 2314fd01b88cSNeilBrown static sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int *skipped, int go_faster) 23151da177e4SLinus Torvalds { 2316e8096360SNeilBrown struct r1conf *conf = mddev->private; 23179f2c9d12SNeilBrown struct r1bio *r1_bio; 23181da177e4SLinus Torvalds struct bio *bio; 23191da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 23203e198f78SNeilBrown int disk = -1; 23211da177e4SLinus Torvalds int i; 23223e198f78SNeilBrown int wonly = -1; 23233e198f78SNeilBrown int write_targets = 0, read_targets = 0; 232457dab0bdSNeilBrown sector_t sync_blocks; 2325e3b9703eSNeilBrown int still_degraded = 0; 232606f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 232706f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 23281da177e4SLinus Torvalds 23291da177e4SLinus Torvalds if (!conf->r1buf_pool) 23301da177e4SLinus Torvalds if (init_resync(conf)) 233157afd89fSNeilBrown return 0; 23321da177e4SLinus Torvalds 233358c0fed4SAndre Noll max_sector = mddev->dev_sectors; 23341da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2335191ea9b2SNeilBrown /* If we aborted, we need to abort the 2336191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2337191ea9b2SNeilBrown * only be one in raid1 resync. 2338191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2339191ea9b2SNeilBrown */ 23406a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 23416a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2342191ea9b2SNeilBrown &sync_blocks, 1); 23436a806c51SNeilBrown else /* completed sync */ 2344191ea9b2SNeilBrown conf->fullsync = 0; 23456a806c51SNeilBrown 23466a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 23471da177e4SLinus Torvalds close_sync(conf); 23481da177e4SLinus Torvalds return 0; 23491da177e4SLinus Torvalds } 23501da177e4SLinus Torvalds 235107d84d10SNeilBrown if (mddev->bitmap == NULL && 235207d84d10SNeilBrown mddev->recovery_cp == MaxSector && 23536394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 235407d84d10SNeilBrown conf->fullsync == 0) { 235507d84d10SNeilBrown *skipped = 1; 235607d84d10SNeilBrown return max_sector - sector_nr; 235707d84d10SNeilBrown } 23586394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 23596394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 23606394cca5SNeilBrown */ 2361e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2362e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2363191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2364191ea9b2SNeilBrown *skipped = 1; 2365191ea9b2SNeilBrown return sync_blocks; 2366191ea9b2SNeilBrown } 23671da177e4SLinus Torvalds /* 236817999be4SNeilBrown * If there is non-resync activity waiting for a turn, 236917999be4SNeilBrown * and resync is going fast enough, 237017999be4SNeilBrown * then let it though before starting on this new sync request. 23711da177e4SLinus Torvalds */ 237217999be4SNeilBrown if (!go_faster && conf->nr_waiting) 23731da177e4SLinus Torvalds msleep_interruptible(1000); 237417999be4SNeilBrown 2375b47490c9SNeilBrown bitmap_cond_end_sync(mddev->bitmap, sector_nr); 23761c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 237717999be4SNeilBrown raise_barrier(conf); 237817999be4SNeilBrown 237917999be4SNeilBrown conf->next_resync = sector_nr; 23801da177e4SLinus Torvalds 23813e198f78SNeilBrown rcu_read_lock(); 23823e198f78SNeilBrown /* 23833e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 23843e198f78SNeilBrown * we might want to read from a different device. So we 23853e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 23863e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 23873e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 23883e198f78SNeilBrown * is OK. 23893e198f78SNeilBrown */ 23901da177e4SLinus Torvalds 23911da177e4SLinus Torvalds r1_bio->mddev = mddev; 23921da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2393191ea9b2SNeilBrown r1_bio->state = 0; 23941da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 23951da177e4SLinus Torvalds 23968f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 23973cb03002SNeilBrown struct md_rdev *rdev; 23981da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23991da177e4SLinus Torvalds 24001da177e4SLinus Torvalds /* take from bio_init */ 24011da177e4SLinus Torvalds bio->bi_next = NULL; 2402db8d9d35SNeilBrown bio->bi_flags &= ~(BIO_POOL_MASK-1); 24031da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 2404802ba064SNeilBrown bio->bi_rw = READ; 24051da177e4SLinus Torvalds bio->bi_vcnt = 0; 24061da177e4SLinus Torvalds bio->bi_idx = 0; 24071da177e4SLinus Torvalds bio->bi_phys_segments = 0; 24081da177e4SLinus Torvalds bio->bi_size = 0; 24091da177e4SLinus Torvalds bio->bi_end_io = NULL; 24101da177e4SLinus Torvalds bio->bi_private = NULL; 24111da177e4SLinus Torvalds 24123e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 24133e198f78SNeilBrown if (rdev == NULL || 24143e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 24158f19ccb2SNeilBrown if (i < conf->raid_disks) 2416e3b9703eSNeilBrown still_degraded = 1; 24173e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 24181da177e4SLinus Torvalds bio->bi_rw = WRITE; 24191da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 24201da177e4SLinus Torvalds write_targets ++; 24213e198f78SNeilBrown } else { 24223e198f78SNeilBrown /* may need to read from here */ 242306f60385SNeilBrown sector_t first_bad = MaxSector; 242406f60385SNeilBrown int bad_sectors; 242506f60385SNeilBrown 242606f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 242706f60385SNeilBrown &first_bad, &bad_sectors)) { 242806f60385SNeilBrown if (first_bad > sector_nr) 242906f60385SNeilBrown good_sectors = first_bad - sector_nr; 243006f60385SNeilBrown else { 243106f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 243206f60385SNeilBrown if (min_bad == 0 || 243306f60385SNeilBrown min_bad > bad_sectors) 243406f60385SNeilBrown min_bad = bad_sectors; 243506f60385SNeilBrown } 243606f60385SNeilBrown } 243706f60385SNeilBrown if (sector_nr < first_bad) { 24383e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 24393e198f78SNeilBrown if (wonly < 0) 24403e198f78SNeilBrown wonly = i; 24413e198f78SNeilBrown } else { 24423e198f78SNeilBrown if (disk < 0) 24433e198f78SNeilBrown disk = i; 24443e198f78SNeilBrown } 244506f60385SNeilBrown bio->bi_rw = READ; 244606f60385SNeilBrown bio->bi_end_io = end_sync_read; 24473e198f78SNeilBrown read_targets++; 24483e198f78SNeilBrown } 244906f60385SNeilBrown } 245006f60385SNeilBrown if (bio->bi_end_io) { 24513e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 24523e198f78SNeilBrown bio->bi_sector = sector_nr + rdev->data_offset; 24533e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 24541da177e4SLinus Torvalds bio->bi_private = r1_bio; 24551da177e4SLinus Torvalds } 245606f60385SNeilBrown } 24573e198f78SNeilBrown rcu_read_unlock(); 24583e198f78SNeilBrown if (disk < 0) 24593e198f78SNeilBrown disk = wonly; 24603e198f78SNeilBrown r1_bio->read_disk = disk; 2461191ea9b2SNeilBrown 246206f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 246306f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 246406f60385SNeilBrown * need to mark them bad on all write targets 246506f60385SNeilBrown */ 246606f60385SNeilBrown int ok = 1; 24678f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 246806f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2469a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 247006f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 247106f60385SNeilBrown min_bad, 0 247206f60385SNeilBrown ) && ok; 247306f60385SNeilBrown } 247406f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 247506f60385SNeilBrown *skipped = 1; 247606f60385SNeilBrown put_buf(r1_bio); 247706f60385SNeilBrown 247806f60385SNeilBrown if (!ok) { 247906f60385SNeilBrown /* Cannot record the badblocks, so need to 248006f60385SNeilBrown * abort the resync. 248106f60385SNeilBrown * If there are multiple read targets, could just 248206f60385SNeilBrown * fail the really bad ones ??? 248306f60385SNeilBrown */ 248406f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 248506f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 248606f60385SNeilBrown return 0; 248706f60385SNeilBrown } else 248806f60385SNeilBrown return min_bad; 248906f60385SNeilBrown 249006f60385SNeilBrown } 249106f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 249206f60385SNeilBrown /* only resync enough to reach the next bad->good 249306f60385SNeilBrown * transition */ 249406f60385SNeilBrown good_sectors = min_bad; 249506f60385SNeilBrown } 249606f60385SNeilBrown 24973e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 24983e198f78SNeilBrown /* extra read targets are also write targets */ 24993e198f78SNeilBrown write_targets += read_targets-1; 25003e198f78SNeilBrown 25013e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 25021da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 25031da177e4SLinus Torvalds * drives must be failed - so we are finished 25041da177e4SLinus Torvalds */ 250557afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 250657afd89fSNeilBrown *skipped = 1; 25071da177e4SLinus Torvalds put_buf(r1_bio); 25081da177e4SLinus Torvalds return rv; 25091da177e4SLinus Torvalds } 25101da177e4SLinus Torvalds 2511c6207277SNeilBrown if (max_sector > mddev->resync_max) 2512c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 251306f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 251406f60385SNeilBrown max_sector = sector_nr + good_sectors; 25151da177e4SLinus Torvalds nr_sectors = 0; 2516289e99e8SNeilBrown sync_blocks = 0; 25171da177e4SLinus Torvalds do { 25181da177e4SLinus Torvalds struct page *page; 25191da177e4SLinus Torvalds int len = PAGE_SIZE; 25201da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 25211da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 25221da177e4SLinus Torvalds if (len == 0) 25231da177e4SLinus Torvalds break; 2524ab7a30c7SNeilBrown if (sync_blocks == 0) { 25256a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2526e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2527e5de485fSNeilBrown !conf->fullsync && 2528e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2529191ea9b2SNeilBrown break; 25309e77c485SEric Sesterhenn BUG_ON(sync_blocks < (PAGE_SIZE>>9)); 25317571ae88SNeilBrown if ((len >> 9) > sync_blocks) 25326a806c51SNeilBrown len = sync_blocks<<9; 2533ab7a30c7SNeilBrown } 2534191ea9b2SNeilBrown 25358f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 25361da177e4SLinus Torvalds bio = r1_bio->bios[i]; 25371da177e4SLinus Torvalds if (bio->bi_end_io) { 2538d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 25391da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 25401da177e4SLinus Torvalds /* stop here */ 2541d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 25421da177e4SLinus Torvalds while (i > 0) { 25431da177e4SLinus Torvalds i--; 25441da177e4SLinus Torvalds bio = r1_bio->bios[i]; 25456a806c51SNeilBrown if (bio->bi_end_io==NULL) 25466a806c51SNeilBrown continue; 25471da177e4SLinus Torvalds /* remove last page from this bio */ 25481da177e4SLinus Torvalds bio->bi_vcnt--; 25491da177e4SLinus Torvalds bio->bi_size -= len; 25501da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 25511da177e4SLinus Torvalds } 25521da177e4SLinus Torvalds goto bio_full; 25531da177e4SLinus Torvalds } 25541da177e4SLinus Torvalds } 25551da177e4SLinus Torvalds } 25561da177e4SLinus Torvalds nr_sectors += len>>9; 25571da177e4SLinus Torvalds sector_nr += len>>9; 2558191ea9b2SNeilBrown sync_blocks -= (len>>9); 25591da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 25601da177e4SLinus Torvalds bio_full: 25611da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 25621da177e4SLinus Torvalds 2563d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2564d11c171eSNeilBrown * compare 2565d11c171eSNeilBrown */ 2566d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2567d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 25682d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2569d11c171eSNeilBrown bio = r1_bio->bios[i]; 2570d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 25712d4f4f33SNeilBrown read_targets--; 2572ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 25731da177e4SLinus Torvalds generic_make_request(bio); 2574d11c171eSNeilBrown } 2575d11c171eSNeilBrown } 2576d11c171eSNeilBrown } else { 2577d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2578d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2579ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2580d11c171eSNeilBrown generic_make_request(bio); 2581d11c171eSNeilBrown 2582d11c171eSNeilBrown } 25831da177e4SLinus Torvalds return nr_sectors; 25841da177e4SLinus Torvalds } 25851da177e4SLinus Torvalds 2586fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 258780c3a6ceSDan Williams { 258880c3a6ceSDan Williams if (sectors) 258980c3a6ceSDan Williams return sectors; 259080c3a6ceSDan Williams 259180c3a6ceSDan Williams return mddev->dev_sectors; 259280c3a6ceSDan Williams } 259380c3a6ceSDan Williams 2594e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 25951da177e4SLinus Torvalds { 2596e8096360SNeilBrown struct r1conf *conf; 2597709ae487SNeilBrown int i; 25980eaf822cSJonathan Brassow struct raid1_info *disk; 25993cb03002SNeilBrown struct md_rdev *rdev; 2600709ae487SNeilBrown int err = -ENOMEM; 26011da177e4SLinus Torvalds 2602e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 26031da177e4SLinus Torvalds if (!conf) 2604709ae487SNeilBrown goto abort; 26051da177e4SLinus Torvalds 26060eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 26078f19ccb2SNeilBrown * mddev->raid_disks * 2, 26081da177e4SLinus Torvalds GFP_KERNEL); 26091da177e4SLinus Torvalds if (!conf->mirrors) 2610709ae487SNeilBrown goto abort; 26111da177e4SLinus Torvalds 2612ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2613ddaf22abSNeilBrown if (!conf->tmppage) 2614709ae487SNeilBrown goto abort; 2615ddaf22abSNeilBrown 2616709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 26171da177e4SLinus Torvalds if (!conf->poolinfo) 2618709ae487SNeilBrown goto abort; 26198f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 26201da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 26211da177e4SLinus Torvalds r1bio_pool_free, 26221da177e4SLinus Torvalds conf->poolinfo); 26231da177e4SLinus Torvalds if (!conf->r1bio_pool) 2624709ae487SNeilBrown goto abort; 2625709ae487SNeilBrown 2626ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 26271da177e4SLinus Torvalds 2628c19d5798SNeilBrown err = -EINVAL; 2629e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2630dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2631aba336bdSNeilBrown struct request_queue *q; 2632709ae487SNeilBrown int disk_idx = rdev->raid_disk; 26331da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 26341da177e4SLinus Torvalds || disk_idx < 0) 26351da177e4SLinus Torvalds continue; 2636c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 2637c19d5798SNeilBrown disk = conf->mirrors + conf->raid_disks + disk_idx; 2638c19d5798SNeilBrown else 26391da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 26401da177e4SLinus Torvalds 2641c19d5798SNeilBrown if (disk->rdev) 2642c19d5798SNeilBrown goto abort; 26431da177e4SLinus Torvalds disk->rdev = rdev; 2644aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 2645aba336bdSNeilBrown if (q->merge_bvec_fn) 2646aba336bdSNeilBrown mddev->merge_check_needed = 1; 26471da177e4SLinus Torvalds 26481da177e4SLinus Torvalds disk->head_position = 0; 264912cee5a8SShaohua Li disk->seq_start = MaxSector; 26501da177e4SLinus Torvalds } 26511da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 26521da177e4SLinus Torvalds conf->mddev = mddev; 26531da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 26541da177e4SLinus Torvalds 26551da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 265617999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 26571da177e4SLinus Torvalds 2658191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 265934db0cd6SNeilBrown conf->pending_count = 0; 2660d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2661191ea9b2SNeilBrown 2662c19d5798SNeilBrown err = -EIO; 26638f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 26641da177e4SLinus Torvalds 26651da177e4SLinus Torvalds disk = conf->mirrors + i; 26661da177e4SLinus Torvalds 2667c19d5798SNeilBrown if (i < conf->raid_disks && 2668c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2669c19d5798SNeilBrown /* This slot has a replacement. */ 2670c19d5798SNeilBrown if (!disk->rdev) { 2671c19d5798SNeilBrown /* No original, just make the replacement 2672c19d5798SNeilBrown * a recovering spare 2673c19d5798SNeilBrown */ 2674c19d5798SNeilBrown disk->rdev = 2675c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2676c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2677c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2678c19d5798SNeilBrown /* Original is not in_sync - bad */ 2679c19d5798SNeilBrown goto abort; 2680c19d5798SNeilBrown } 2681c19d5798SNeilBrown 26825fd6c1dcSNeilBrown if (!disk->rdev || 26835fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 26841da177e4SLinus Torvalds disk->head_position = 0; 26854f0a5e01SJonathan Brassow if (disk->rdev && 26864f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 268717571284SNeilBrown conf->fullsync = 1; 2688be4d3280SShaohua Li } 26891da177e4SLinus Torvalds } 2690709ae487SNeilBrown 2691709ae487SNeilBrown err = -ENOMEM; 26920232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 2693709ae487SNeilBrown if (!conf->thread) { 26941da177e4SLinus Torvalds printk(KERN_ERR 26959dd1e2faSNeilBrown "md/raid1:%s: couldn't allocate thread\n", 26961da177e4SLinus Torvalds mdname(mddev)); 2697709ae487SNeilBrown goto abort; 26981da177e4SLinus Torvalds } 2699191ea9b2SNeilBrown 2700709ae487SNeilBrown return conf; 2701709ae487SNeilBrown 2702709ae487SNeilBrown abort: 2703709ae487SNeilBrown if (conf) { 2704709ae487SNeilBrown if (conf->r1bio_pool) 2705709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2706709ae487SNeilBrown kfree(conf->mirrors); 2707709ae487SNeilBrown safe_put_page(conf->tmppage); 2708709ae487SNeilBrown kfree(conf->poolinfo); 2709709ae487SNeilBrown kfree(conf); 2710709ae487SNeilBrown } 2711709ae487SNeilBrown return ERR_PTR(err); 2712709ae487SNeilBrown } 2713709ae487SNeilBrown 27145220ea1eSmajianpeng static int stop(struct mddev *mddev); 2715fd01b88cSNeilBrown static int run(struct mddev *mddev) 2716709ae487SNeilBrown { 2717e8096360SNeilBrown struct r1conf *conf; 2718709ae487SNeilBrown int i; 27193cb03002SNeilBrown struct md_rdev *rdev; 27205220ea1eSmajianpeng int ret; 2721709ae487SNeilBrown 2722709ae487SNeilBrown if (mddev->level != 1) { 27239dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", 2724709ae487SNeilBrown mdname(mddev), mddev->level); 2725709ae487SNeilBrown return -EIO; 2726709ae487SNeilBrown } 2727709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 27289dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", 2729709ae487SNeilBrown mdname(mddev)); 2730709ae487SNeilBrown return -EIO; 2731709ae487SNeilBrown } 2732709ae487SNeilBrown /* 2733709ae487SNeilBrown * copy the already verified devices into our private RAID1 2734709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2735709ae487SNeilBrown * should be freed in stop()] 2736709ae487SNeilBrown */ 2737709ae487SNeilBrown if (mddev->private == NULL) 2738709ae487SNeilBrown conf = setup_conf(mddev); 2739709ae487SNeilBrown else 2740709ae487SNeilBrown conf = mddev->private; 2741709ae487SNeilBrown 2742709ae487SNeilBrown if (IS_ERR(conf)) 2743709ae487SNeilBrown return PTR_ERR(conf); 2744709ae487SNeilBrown 2745dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 27461ed7242eSJonathan Brassow if (!mddev->gendisk) 27471ed7242eSJonathan Brassow continue; 2748709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2749709ae487SNeilBrown rdev->data_offset << 9); 2750709ae487SNeilBrown } 2751709ae487SNeilBrown 2752709ae487SNeilBrown mddev->degraded = 0; 2753709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2754709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2755709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2756709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2757709ae487SNeilBrown mddev->degraded++; 2758709ae487SNeilBrown 2759709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2760709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2761709ae487SNeilBrown 27628c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 27639dd1e2faSNeilBrown printk(KERN_NOTICE "md/raid1:%s: not clean" 27648c6ac868SAndre Noll " -- starting background reconstruction\n", 27658c6ac868SAndre Noll mdname(mddev)); 27661da177e4SLinus Torvalds printk(KERN_INFO 27679dd1e2faSNeilBrown "md/raid1:%s: active with %d out of %d mirrors\n", 27681da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 27691da177e4SLinus Torvalds mddev->raid_disks); 2770709ae487SNeilBrown 27711da177e4SLinus Torvalds /* 27721da177e4SLinus Torvalds * Ok, everything is just fine now 27731da177e4SLinus Torvalds */ 2774709ae487SNeilBrown mddev->thread = conf->thread; 2775709ae487SNeilBrown conf->thread = NULL; 2776709ae487SNeilBrown mddev->private = conf; 2777709ae487SNeilBrown 27781f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 27791da177e4SLinus Torvalds 27801ed7242eSJonathan Brassow if (mddev->queue) { 27810d129228SNeilBrown mddev->queue->backing_dev_info.congested_fn = raid1_congested; 27820d129228SNeilBrown mddev->queue->backing_dev_info.congested_data = mddev; 27836b740b8dSNeilBrown blk_queue_merge_bvec(mddev->queue, raid1_mergeable_bvec); 27841ed7242eSJonathan Brassow } 27855220ea1eSmajianpeng 27865220ea1eSmajianpeng ret = md_integrity_register(mddev); 27875220ea1eSmajianpeng if (ret) 27885220ea1eSmajianpeng stop(mddev); 27895220ea1eSmajianpeng return ret; 27901da177e4SLinus Torvalds } 27911da177e4SLinus Torvalds 2792fd01b88cSNeilBrown static int stop(struct mddev *mddev) 27931da177e4SLinus Torvalds { 2794e8096360SNeilBrown struct r1conf *conf = mddev->private; 27954b6d287fSNeilBrown struct bitmap *bitmap = mddev->bitmap; 27964b6d287fSNeilBrown 27974b6d287fSNeilBrown /* wait for behind writes to complete */ 2798e555190dSNeilBrown if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 27999dd1e2faSNeilBrown printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", 28009dd1e2faSNeilBrown mdname(mddev)); 28014b6d287fSNeilBrown /* need to kick something here to make sure I/O goes? */ 2802e555190dSNeilBrown wait_event(bitmap->behind_wait, 2803e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 28044b6d287fSNeilBrown } 28051da177e4SLinus Torvalds 2806409c57f3SNeilBrown raise_barrier(conf); 2807409c57f3SNeilBrown lower_barrier(conf); 2808409c57f3SNeilBrown 280901f96c0aSNeilBrown md_unregister_thread(&mddev->thread); 28101da177e4SLinus Torvalds if (conf->r1bio_pool) 28111da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 28121da177e4SLinus Torvalds kfree(conf->mirrors); 28131da177e4SLinus Torvalds kfree(conf->poolinfo); 28141da177e4SLinus Torvalds kfree(conf); 28151da177e4SLinus Torvalds mddev->private = NULL; 28161da177e4SLinus Torvalds return 0; 28171da177e4SLinus Torvalds } 28181da177e4SLinus Torvalds 2819fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 28201da177e4SLinus Torvalds { 28211da177e4SLinus Torvalds /* no resync is happening, and there is enough space 28221da177e4SLinus Torvalds * on all devices, so we can resize. 28231da177e4SLinus Torvalds * We need to make sure resync covers any new space. 28241da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 28251da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 28261da177e4SLinus Torvalds * worth it. 28271da177e4SLinus Torvalds */ 2828a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 2829a4a6125aSNeilBrown if (mddev->external_size && 2830a4a6125aSNeilBrown mddev->array_sectors > newsize) 2831b522adcdSDan Williams return -EINVAL; 2832a4a6125aSNeilBrown if (mddev->bitmap) { 2833a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 2834a4a6125aSNeilBrown if (ret) 2835a4a6125aSNeilBrown return ret; 2836a4a6125aSNeilBrown } 2837a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 2838f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 2839449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 2840b522adcdSDan Williams if (sectors > mddev->dev_sectors && 2841b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 284258c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 28431da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 28441da177e4SLinus Torvalds } 2845b522adcdSDan Williams mddev->dev_sectors = sectors; 28464b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 28471da177e4SLinus Torvalds return 0; 28481da177e4SLinus Torvalds } 28491da177e4SLinus Torvalds 2850fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 28511da177e4SLinus Torvalds { 28521da177e4SLinus Torvalds /* We need to: 28531da177e4SLinus Torvalds * 1/ resize the r1bio_pool 28541da177e4SLinus Torvalds * 2/ resize conf->mirrors 28551da177e4SLinus Torvalds * 28561da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 28571da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 28581da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 28596ea9c07cSNeilBrown * 28606ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 28616ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 28621da177e4SLinus Torvalds */ 28631da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 28641da177e4SLinus Torvalds struct pool_info *newpoolinfo; 28650eaf822cSJonathan Brassow struct raid1_info *newmirrors; 2866e8096360SNeilBrown struct r1conf *conf = mddev->private; 286763c70c4fSNeilBrown int cnt, raid_disks; 2868c04be0aaSNeilBrown unsigned long flags; 2869b5470dc5SDan Williams int d, d2, err; 28701da177e4SLinus Torvalds 287163c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 2872664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 287363c70c4fSNeilBrown mddev->layout != mddev->new_layout || 287463c70c4fSNeilBrown mddev->level != mddev->new_level) { 2875664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 287663c70c4fSNeilBrown mddev->new_layout = mddev->layout; 287763c70c4fSNeilBrown mddev->new_level = mddev->level; 287863c70c4fSNeilBrown return -EINVAL; 287963c70c4fSNeilBrown } 288063c70c4fSNeilBrown 2881b5470dc5SDan Williams err = md_allow_write(mddev); 2882b5470dc5SDan Williams if (err) 2883b5470dc5SDan Williams return err; 28842a2275d6SNeilBrown 288563c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 288663c70c4fSNeilBrown 28876ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 28886ea9c07cSNeilBrown cnt=0; 28896ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 28901da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 28916ea9c07cSNeilBrown cnt++; 28926ea9c07cSNeilBrown if (cnt > raid_disks) 28931da177e4SLinus Torvalds return -EBUSY; 28946ea9c07cSNeilBrown } 28951da177e4SLinus Torvalds 28961da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 28971da177e4SLinus Torvalds if (!newpoolinfo) 28981da177e4SLinus Torvalds return -ENOMEM; 28991da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 29008f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 29011da177e4SLinus Torvalds 29021da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 29031da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 29041da177e4SLinus Torvalds if (!newpool) { 29051da177e4SLinus Torvalds kfree(newpoolinfo); 29061da177e4SLinus Torvalds return -ENOMEM; 29071da177e4SLinus Torvalds } 29080eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 29098f19ccb2SNeilBrown GFP_KERNEL); 29101da177e4SLinus Torvalds if (!newmirrors) { 29111da177e4SLinus Torvalds kfree(newpoolinfo); 29121da177e4SLinus Torvalds mempool_destroy(newpool); 29131da177e4SLinus Torvalds return -ENOMEM; 29141da177e4SLinus Torvalds } 29151da177e4SLinus Torvalds 291617999be4SNeilBrown raise_barrier(conf); 29171da177e4SLinus Torvalds 29181da177e4SLinus Torvalds /* ok, everything is stopped */ 29191da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 29201da177e4SLinus Torvalds conf->r1bio_pool = newpool; 29216ea9c07cSNeilBrown 2922a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 29233cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 2924a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 292536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 2926a88aa786SNeilBrown rdev->raid_disk = d2; 292736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 292836fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 2929a88aa786SNeilBrown printk(KERN_WARNING 293036fad858SNamhyung Kim "md/raid1:%s: cannot register rd%d\n", 293136fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 2932a88aa786SNeilBrown } 2933a88aa786SNeilBrown if (rdev) 2934a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 29356ea9c07cSNeilBrown } 29361da177e4SLinus Torvalds kfree(conf->mirrors); 29371da177e4SLinus Torvalds conf->mirrors = newmirrors; 29381da177e4SLinus Torvalds kfree(conf->poolinfo); 29391da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 29401da177e4SLinus Torvalds 2941c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 29421da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 2943c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 29441da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 294563c70c4fSNeilBrown mddev->delta_disks = 0; 29461da177e4SLinus Torvalds 294717999be4SNeilBrown lower_barrier(conf); 29481da177e4SLinus Torvalds 29491da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 29501da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 29511da177e4SLinus Torvalds 29521da177e4SLinus Torvalds mempool_destroy(oldpool); 29531da177e4SLinus Torvalds return 0; 29541da177e4SLinus Torvalds } 29551da177e4SLinus Torvalds 2956fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 295736fa3063SNeilBrown { 2958e8096360SNeilBrown struct r1conf *conf = mddev->private; 295936fa3063SNeilBrown 296036fa3063SNeilBrown switch(state) { 29616eef4b21SNeilBrown case 2: /* wake for suspend */ 29626eef4b21SNeilBrown wake_up(&conf->wait_barrier); 29636eef4b21SNeilBrown break; 29649e6603daSNeilBrown case 1: 296517999be4SNeilBrown raise_barrier(conf); 296636fa3063SNeilBrown break; 29679e6603daSNeilBrown case 0: 296817999be4SNeilBrown lower_barrier(conf); 296936fa3063SNeilBrown break; 297036fa3063SNeilBrown } 297136fa3063SNeilBrown } 297236fa3063SNeilBrown 2973fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 2974709ae487SNeilBrown { 2975709ae487SNeilBrown /* raid1 can take over: 2976709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 2977709ae487SNeilBrown */ 2978709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 2979e8096360SNeilBrown struct r1conf *conf; 2980709ae487SNeilBrown mddev->new_level = 1; 2981709ae487SNeilBrown mddev->new_layout = 0; 2982709ae487SNeilBrown mddev->new_chunk_sectors = 0; 2983709ae487SNeilBrown conf = setup_conf(mddev); 2984709ae487SNeilBrown if (!IS_ERR(conf)) 2985709ae487SNeilBrown conf->barrier = 1; 2986709ae487SNeilBrown return conf; 2987709ae487SNeilBrown } 2988709ae487SNeilBrown return ERR_PTR(-EINVAL); 2989709ae487SNeilBrown } 29901da177e4SLinus Torvalds 299184fc4b56SNeilBrown static struct md_personality raid1_personality = 29921da177e4SLinus Torvalds { 29931da177e4SLinus Torvalds .name = "raid1", 29942604b703SNeilBrown .level = 1, 29951da177e4SLinus Torvalds .owner = THIS_MODULE, 29961da177e4SLinus Torvalds .make_request = make_request, 29971da177e4SLinus Torvalds .run = run, 29981da177e4SLinus Torvalds .stop = stop, 29991da177e4SLinus Torvalds .status = status, 30001da177e4SLinus Torvalds .error_handler = error, 30011da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 30021da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 30031da177e4SLinus Torvalds .spare_active = raid1_spare_active, 30041da177e4SLinus Torvalds .sync_request = sync_request, 30051da177e4SLinus Torvalds .resize = raid1_resize, 300680c3a6ceSDan Williams .size = raid1_size, 300763c70c4fSNeilBrown .check_reshape = raid1_reshape, 300836fa3063SNeilBrown .quiesce = raid1_quiesce, 3009709ae487SNeilBrown .takeover = raid1_takeover, 30101da177e4SLinus Torvalds }; 30111da177e4SLinus Torvalds 30121da177e4SLinus Torvalds static int __init raid_init(void) 30131da177e4SLinus Torvalds { 30142604b703SNeilBrown return register_md_personality(&raid1_personality); 30151da177e4SLinus Torvalds } 30161da177e4SLinus Torvalds 30171da177e4SLinus Torvalds static void raid_exit(void) 30181da177e4SLinus Torvalds { 30192604b703SNeilBrown unregister_md_personality(&raid1_personality); 30201da177e4SLinus Torvalds } 30211da177e4SLinus Torvalds 30221da177e4SLinus Torvalds module_init(raid_init); 30231da177e4SLinus Torvalds module_exit(raid_exit); 30241da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 30250efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 30261da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3027d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 30282604b703SNeilBrown MODULE_ALIAS("md-level-1"); 302934db0cd6SNeilBrown 303034db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3031