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 3425570727SStephen Rothwell #include <linux/delay.h> 35bff61975SNeilBrown #include <linux/blkdev.h> 36bff61975SNeilBrown #include <linux/seq_file.h> 3743b2e5d8SNeilBrown #include "md.h" 38ef740c37SChristoph Hellwig #include "raid1.h" 39ef740c37SChristoph Hellwig #include "bitmap.h" 40191ea9b2SNeilBrown 41191ea9b2SNeilBrown #define DEBUG 0 42191ea9b2SNeilBrown #if DEBUG 43191ea9b2SNeilBrown #define PRINTK(x...) printk(x) 44191ea9b2SNeilBrown #else 45191ea9b2SNeilBrown #define PRINTK(x...) 46191ea9b2SNeilBrown #endif 471da177e4SLinus Torvalds 481da177e4SLinus Torvalds /* 491da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 501da177e4SLinus Torvalds */ 511da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static void unplug_slaves(mddev_t *mddev); 551da177e4SLinus Torvalds 5617999be4SNeilBrown static void allow_barrier(conf_t *conf); 5717999be4SNeilBrown static void lower_barrier(conf_t *conf); 581da177e4SLinus Torvalds 59dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds struct pool_info *pi = data; 621da177e4SLinus Torvalds r1bio_t *r1_bio; 631da177e4SLinus Torvalds int size = offsetof(r1bio_t, bios[pi->raid_disks]); 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 669ffae0cfSNeilBrown r1_bio = kzalloc(size, gfp_flags); 67ed9bfdf1SNeilBrown if (!r1_bio && pi->mddev) 681da177e4SLinus Torvalds unplug_slaves(pi->mddev); 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds return r1_bio; 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds kfree(r1_bio); 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 791da177e4SLinus Torvalds //#define RESYNC_BLOCK_SIZE PAGE_SIZE 801da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 811da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 821da177e4SLinus Torvalds #define RESYNC_WINDOW (2048*1024) 831da177e4SLinus Torvalds 84dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 851da177e4SLinus Torvalds { 861da177e4SLinus Torvalds struct pool_info *pi = data; 871da177e4SLinus Torvalds struct page *page; 881da177e4SLinus Torvalds r1bio_t *r1_bio; 891da177e4SLinus Torvalds struct bio *bio; 901da177e4SLinus Torvalds int i, j; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 931da177e4SLinus Torvalds if (!r1_bio) { 941da177e4SLinus Torvalds unplug_slaves(pi->mddev); 951da177e4SLinus Torvalds return NULL; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* 991da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1001da177e4SLinus Torvalds */ 1011da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1021da177e4SLinus Torvalds bio = bio_alloc(gfp_flags, RESYNC_PAGES); 1031da177e4SLinus Torvalds if (!bio) 1041da177e4SLinus Torvalds goto out_free_bio; 1051da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 109d11c171eSNeilBrown * the first bio. 110d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 111d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1121da177e4SLinus Torvalds */ 113d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 114d11c171eSNeilBrown j = pi->raid_disks; 115d11c171eSNeilBrown else 116d11c171eSNeilBrown j = 1; 117d11c171eSNeilBrown while(j--) { 118d11c171eSNeilBrown bio = r1_bio->bios[j]; 1191da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1201da177e4SLinus Torvalds page = alloc_page(gfp_flags); 1211da177e4SLinus Torvalds if (unlikely(!page)) 1221da177e4SLinus Torvalds goto out_free_pages; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = page; 125303a0e11SNeilBrown bio->bi_vcnt = i+1; 1261da177e4SLinus Torvalds } 127d11c171eSNeilBrown } 128d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 129d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 130d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 131d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 132d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 133d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 134d11c171eSNeilBrown } 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds return r1_bio; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds out_free_pages: 141d11c171eSNeilBrown for (j=0 ; j < pi->raid_disks; j++) 142303a0e11SNeilBrown for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) 143303a0e11SNeilBrown put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); 144d11c171eSNeilBrown j = -1; 1451da177e4SLinus Torvalds out_free_bio: 1461da177e4SLinus Torvalds while ( ++j < pi->raid_disks ) 1471da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1481da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1491da177e4SLinus Torvalds return NULL; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds struct pool_info *pi = data; 155d11c171eSNeilBrown int i,j; 1561da177e4SLinus Torvalds r1bio_t *r1bio = __r1_bio; 1571da177e4SLinus Torvalds 158d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 159d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 160d11c171eSNeilBrown if (j == 0 || 161d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 162d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1631345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1661da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) 1721da177e4SLinus Torvalds { 1731da177e4SLinus Torvalds int i; 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 1761da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 177cf30a473SNeilBrown if (*bio && *bio != IO_BLOCKED) 1781da177e4SLinus Torvalds bio_put(*bio); 1791da177e4SLinus Torvalds *bio = NULL; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds 183858119e1SArjan van de Ven static void free_r1bio(r1bio_t *r1_bio) 1841da177e4SLinus Torvalds { 185070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* 1881da177e4SLinus Torvalds * Wake up any possible resync thread that waits for the device 1891da177e4SLinus Torvalds * to go idle. 1901da177e4SLinus Torvalds */ 19117999be4SNeilBrown allow_barrier(conf); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1941da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1951da177e4SLinus Torvalds } 1961da177e4SLinus Torvalds 197858119e1SArjan van de Ven static void put_buf(r1bio_t *r1_bio) 1981da177e4SLinus Torvalds { 199070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 2003e198f78SNeilBrown int i; 2013e198f78SNeilBrown 2023e198f78SNeilBrown for (i=0; i<conf->raid_disks; 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 2131da177e4SLinus Torvalds static void reschedule_retry(r1bio_t *r1_bio) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds unsigned long flags; 2161da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 217070ec55dSNeilBrown conf_t *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 */ 2331da177e4SLinus Torvalds static void raid_end_bio_io(r1bio_t *r1_bio) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2361da177e4SLinus Torvalds 2374b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2384b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 2394b6d287fSNeilBrown PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", 2404b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2414b6d287fSNeilBrown (unsigned long long) bio->bi_sector, 2424b6d287fSNeilBrown (unsigned long long) bio->bi_sector + 2434b6d287fSNeilBrown (bio->bi_size >> 9) - 1); 2444b6d287fSNeilBrown 2456712ecf8SNeilBrown bio_endio(bio, 2461da177e4SLinus Torvalds test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); 2474b6d287fSNeilBrown } 2481da177e4SLinus Torvalds free_r1bio(r1_bio); 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* 2521da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2531da177e4SLinus Torvalds */ 2541da177e4SLinus Torvalds static inline void update_head_pos(int disk, r1bio_t *r1_bio) 2551da177e4SLinus Torvalds { 256070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2591da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2601da177e4SLinus Torvalds } 2611da177e4SLinus Torvalds 2626712ecf8SNeilBrown static void raid1_end_read_request(struct bio *bio, int error) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2657b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 2661da177e4SLinus Torvalds int mirror; 267070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds mirror = r1_bio->read_disk; 2701da177e4SLinus Torvalds /* 2711da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 2721da177e4SLinus Torvalds */ 273ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 274ddaf22abSNeilBrown 275220946c9SNeilBrown if (uptodate) 2761da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 277dd00a99eSNeilBrown else { 278dd00a99eSNeilBrown /* If all other devices have failed, we want to return 279dd00a99eSNeilBrown * the error upwards rather than fail the last device. 280dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 281dd00a99eSNeilBrown */ 282dd00a99eSNeilBrown unsigned long flags; 283dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 284dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 285dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 286dd00a99eSNeilBrown !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) 287dd00a99eSNeilBrown uptodate = 1; 288dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 289dd00a99eSNeilBrown } 2901da177e4SLinus Torvalds 291dd00a99eSNeilBrown if (uptodate) 2921da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 293dd00a99eSNeilBrown else { 2941da177e4SLinus Torvalds /* 2951da177e4SLinus Torvalds * oops, read error: 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 2981da177e4SLinus Torvalds if (printk_ratelimit()) 2991da177e4SLinus Torvalds printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n", 3001da177e4SLinus Torvalds bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); 3011da177e4SLinus Torvalds reschedule_retry(r1_bio); 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds 3076712ecf8SNeilBrown static void raid1_end_write_request(struct bio *bio, int error) 3081da177e4SLinus Torvalds { 3091da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3107b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 311a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 312070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 31304b857f7SNeilBrown struct bio *to_put = NULL; 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds for (mirror = 0; mirror < conf->raid_disks; mirror++) 3171da177e4SLinus Torvalds if (r1_bio->bios[mirror] == bio) 3181da177e4SLinus Torvalds break; 3191da177e4SLinus Torvalds 320bea27718SNeilBrown if (error == -EOPNOTSUPP && test_bit(R1BIO_Barrier, &r1_bio->state)) { 321a9701a30SNeilBrown set_bit(BarriersNotsupp, &conf->mirrors[mirror].rdev->flags); 322a9701a30SNeilBrown set_bit(R1BIO_BarrierRetry, &r1_bio->state); 323a9701a30SNeilBrown r1_bio->mddev->barriers_work = 0; 3245e7dd2abSNeilBrown /* Don't rdev_dec_pending in this branch - keep it for the retry */ 325a9701a30SNeilBrown } else { 3261da177e4SLinus Torvalds /* 3271da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3281da177e4SLinus Torvalds */ 329a9701a30SNeilBrown r1_bio->bios[mirror] = NULL; 33004b857f7SNeilBrown to_put = bio; 331191ea9b2SNeilBrown if (!uptodate) { 3321da177e4SLinus Torvalds md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); 333191ea9b2SNeilBrown /* an I/O failed, we can't clear the bitmap */ 334191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 335191ea9b2SNeilBrown } else 3361da177e4SLinus Torvalds /* 3371da177e4SLinus Torvalds * Set R1BIO_Uptodate in our master bio, so that 3381da177e4SLinus Torvalds * we will return a good error code for to the higher 3391da177e4SLinus Torvalds * levels even if IO on some other mirrored buffer fails. 3401da177e4SLinus Torvalds * 3411da177e4SLinus Torvalds * The 'master' represents the composite IO operation to 3421da177e4SLinus Torvalds * user-side. So if something waits for IO, then it will 3431da177e4SLinus Torvalds * wait for the 'master' bio. 3441da177e4SLinus Torvalds */ 3451da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 3481da177e4SLinus Torvalds 3494b6d287fSNeilBrown if (behind) { 3504b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 3514b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 3524b6d287fSNeilBrown 3534b6d287fSNeilBrown /* In behind mode, we ACK the master bio once the I/O has safely 3544b6d287fSNeilBrown * reached all non-writemostly disks. Setting the Returned bit 3554b6d287fSNeilBrown * ensures that this gets done only once -- we don't ever want to 3564b6d287fSNeilBrown * return -EIO here, instead we'll wait */ 3574b6d287fSNeilBrown 3584b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 3594b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 3604b6d287fSNeilBrown /* Maybe we can return now */ 3614b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 3624b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 3634b6d287fSNeilBrown PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", 3644b6d287fSNeilBrown (unsigned long long) mbio->bi_sector, 3654b6d287fSNeilBrown (unsigned long long) mbio->bi_sector + 3664b6d287fSNeilBrown (mbio->bi_size >> 9) - 1); 3676712ecf8SNeilBrown bio_endio(mbio, 0); 3684b6d287fSNeilBrown } 3694b6d287fSNeilBrown } 3704b6d287fSNeilBrown } 3715e7dd2abSNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 372a9701a30SNeilBrown } 3731da177e4SLinus Torvalds /* 3741da177e4SLinus Torvalds * 3751da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 3761da177e4SLinus Torvalds * already. 3771da177e4SLinus Torvalds */ 3781da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 379c70810b3SNeilBrown if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) 380a9701a30SNeilBrown reschedule_retry(r1_bio); 381c70810b3SNeilBrown else { 3825e7dd2abSNeilBrown /* it really is the end of this request */ 3834b6d287fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3844b6d287fSNeilBrown /* free extra copy of the data pages */ 3854b6d287fSNeilBrown int i = bio->bi_vcnt; 3864b6d287fSNeilBrown while (i--) 3871345b1d8SNeilBrown safe_put_page(bio->bi_io_vec[i].bv_page); 3884b6d287fSNeilBrown } 389191ea9b2SNeilBrown /* clear the bitmap if all writes complete successfully */ 390191ea9b2SNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 391191ea9b2SNeilBrown r1_bio->sectors, 3924b6d287fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 3934b6d287fSNeilBrown behind); 3941da177e4SLinus Torvalds md_write_end(r1_bio->mddev); 3951da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 3961da177e4SLinus Torvalds } 397c70810b3SNeilBrown } 398c70810b3SNeilBrown 39904b857f7SNeilBrown if (to_put) 40004b857f7SNeilBrown bio_put(to_put); 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* 4051da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4061da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4071da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4081da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4091da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 4101da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 4111da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 4121da177e4SLinus Torvalds * 4131da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 4141da177e4SLinus Torvalds * because position is mirror, not device based. 4151da177e4SLinus Torvalds * 4161da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 4171da177e4SLinus Torvalds */ 4181da177e4SLinus Torvalds static int read_balance(conf_t *conf, r1bio_t *r1_bio) 4191da177e4SLinus Torvalds { 4201da177e4SLinus Torvalds const unsigned long this_sector = r1_bio->sector; 4211da177e4SLinus Torvalds int new_disk = conf->last_used, disk = new_disk; 4228ddf9efeSNeilBrown int wonly_disk = -1; 4231da177e4SLinus Torvalds const int sectors = r1_bio->sectors; 4241da177e4SLinus Torvalds sector_t new_distance, current_distance; 4258ddf9efeSNeilBrown mdk_rdev_t *rdev; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds rcu_read_lock(); 4281da177e4SLinus Torvalds /* 4298ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 4301da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 4311da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 4321da177e4SLinus Torvalds */ 4331da177e4SLinus Torvalds retry: 4341da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 4351da177e4SLinus Torvalds (this_sector + sectors >= conf->next_resync)) { 4361da177e4SLinus Torvalds /* Choose the first operation device, for consistancy */ 4371da177e4SLinus Torvalds new_disk = 0; 4381da177e4SLinus Torvalds 439d6065f7bSSuzanne Wood for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); 440cf30a473SNeilBrown r1_bio->bios[new_disk] == IO_BLOCKED || 441b2d444d7SNeilBrown !rdev || !test_bit(In_sync, &rdev->flags) 4428ddf9efeSNeilBrown || test_bit(WriteMostly, &rdev->flags); 443d6065f7bSSuzanne Wood rdev = rcu_dereference(conf->mirrors[++new_disk].rdev)) { 4448ddf9efeSNeilBrown 445cf30a473SNeilBrown if (rdev && test_bit(In_sync, &rdev->flags) && 446cf30a473SNeilBrown r1_bio->bios[new_disk] != IO_BLOCKED) 4478ddf9efeSNeilBrown wonly_disk = new_disk; 4488ddf9efeSNeilBrown 4498ddf9efeSNeilBrown if (new_disk == conf->raid_disks - 1) { 4508ddf9efeSNeilBrown new_disk = wonly_disk; 4511da177e4SLinus Torvalds break; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds goto rb_out; 4551da177e4SLinus Torvalds } 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* make sure the disk is operational */ 459d6065f7bSSuzanne Wood for (rdev = rcu_dereference(conf->mirrors[new_disk].rdev); 460cf30a473SNeilBrown r1_bio->bios[new_disk] == IO_BLOCKED || 461b2d444d7SNeilBrown !rdev || !test_bit(In_sync, &rdev->flags) || 4628ddf9efeSNeilBrown test_bit(WriteMostly, &rdev->flags); 463d6065f7bSSuzanne Wood rdev = rcu_dereference(conf->mirrors[new_disk].rdev)) { 4648ddf9efeSNeilBrown 465cf30a473SNeilBrown if (rdev && test_bit(In_sync, &rdev->flags) && 466cf30a473SNeilBrown r1_bio->bios[new_disk] != IO_BLOCKED) 4678ddf9efeSNeilBrown wonly_disk = new_disk; 4688ddf9efeSNeilBrown 4691da177e4SLinus Torvalds if (new_disk <= 0) 4701da177e4SLinus Torvalds new_disk = conf->raid_disks; 4711da177e4SLinus Torvalds new_disk--; 4721da177e4SLinus Torvalds if (new_disk == disk) { 4738ddf9efeSNeilBrown new_disk = wonly_disk; 4748ddf9efeSNeilBrown break; 4758ddf9efeSNeilBrown } 4768ddf9efeSNeilBrown } 4778ddf9efeSNeilBrown 4788ddf9efeSNeilBrown if (new_disk < 0) 4791da177e4SLinus Torvalds goto rb_out; 4808ddf9efeSNeilBrown 4811da177e4SLinus Torvalds disk = new_disk; 4821da177e4SLinus Torvalds /* now disk == new_disk == starting point for search */ 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds /* 4851da177e4SLinus Torvalds * Don't change to another disk for sequential reads: 4861da177e4SLinus Torvalds */ 4871da177e4SLinus Torvalds if (conf->next_seq_sect == this_sector) 4881da177e4SLinus Torvalds goto rb_out; 4891da177e4SLinus Torvalds if (this_sector == conf->mirrors[new_disk].head_position) 4901da177e4SLinus Torvalds goto rb_out; 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds current_distance = abs(this_sector - conf->mirrors[disk].head_position); 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds /* Find the disk whose head is closest */ 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds do { 4971da177e4SLinus Torvalds if (disk <= 0) 4981da177e4SLinus Torvalds disk = conf->raid_disks; 4991da177e4SLinus Torvalds disk--; 5001da177e4SLinus Torvalds 501d6065f7bSSuzanne Wood rdev = rcu_dereference(conf->mirrors[disk].rdev); 5028ddf9efeSNeilBrown 503cf30a473SNeilBrown if (!rdev || r1_bio->bios[disk] == IO_BLOCKED || 504b2d444d7SNeilBrown !test_bit(In_sync, &rdev->flags) || 5058ddf9efeSNeilBrown test_bit(WriteMostly, &rdev->flags)) 5061da177e4SLinus Torvalds continue; 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds if (!atomic_read(&rdev->nr_pending)) { 5091da177e4SLinus Torvalds new_disk = disk; 5101da177e4SLinus Torvalds break; 5111da177e4SLinus Torvalds } 5121da177e4SLinus Torvalds new_distance = abs(this_sector - conf->mirrors[disk].head_position); 5131da177e4SLinus Torvalds if (new_distance < current_distance) { 5141da177e4SLinus Torvalds current_distance = new_distance; 5151da177e4SLinus Torvalds new_disk = disk; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds } while (disk != conf->last_used); 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds rb_out: 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds if (new_disk >= 0) { 523d6065f7bSSuzanne Wood rdev = rcu_dereference(conf->mirrors[new_disk].rdev); 5248ddf9efeSNeilBrown if (!rdev) 5258ddf9efeSNeilBrown goto retry; 5268ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 527b2d444d7SNeilBrown if (!test_bit(In_sync, &rdev->flags)) { 5281da177e4SLinus Torvalds /* cannot risk returning a device that failed 5291da177e4SLinus Torvalds * before we inc'ed nr_pending 5301da177e4SLinus Torvalds */ 53103c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 5321da177e4SLinus Torvalds goto retry; 5331da177e4SLinus Torvalds } 5348ddf9efeSNeilBrown conf->next_seq_sect = this_sector + sectors; 5358ddf9efeSNeilBrown conf->last_used = new_disk; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds rcu_read_unlock(); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds return new_disk; 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds static void unplug_slaves(mddev_t *mddev) 5431da177e4SLinus Torvalds { 544070ec55dSNeilBrown conf_t *conf = mddev->private; 5451da177e4SLinus Torvalds int i; 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds rcu_read_lock(); 5481da177e4SLinus Torvalds for (i=0; i<mddev->raid_disks; i++) { 549d6065f7bSSuzanne Wood mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 550b2d444d7SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) { 551165125e1SJens Axboe struct request_queue *r_queue = bdev_get_queue(rdev->bdev); 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds atomic_inc(&rdev->nr_pending); 5541da177e4SLinus Torvalds rcu_read_unlock(); 5551da177e4SLinus Torvalds 5562ad8b1efSAlan D. Brunelle blk_unplug(r_queue); 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds rdev_dec_pending(rdev, mddev); 5591da177e4SLinus Torvalds rcu_read_lock(); 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds rcu_read_unlock(); 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 565165125e1SJens Axboe static void raid1_unplug(struct request_queue *q) 5661da177e4SLinus Torvalds { 567191ea9b2SNeilBrown mddev_t *mddev = q->queuedata; 568191ea9b2SNeilBrown 569191ea9b2SNeilBrown unplug_slaves(mddev); 570191ea9b2SNeilBrown md_wakeup_thread(mddev->thread); 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5730d129228SNeilBrown static int raid1_congested(void *data, int bits) 5740d129228SNeilBrown { 5750d129228SNeilBrown mddev_t *mddev = data; 576070ec55dSNeilBrown conf_t *conf = mddev->private; 5770d129228SNeilBrown int i, ret = 0; 5780d129228SNeilBrown 5793fa841d7SNeilBrown if (mddev_congested(mddev, bits)) 5803fa841d7SNeilBrown return 1; 5813fa841d7SNeilBrown 5820d129228SNeilBrown rcu_read_lock(); 5830d129228SNeilBrown for (i = 0; i < mddev->raid_disks; i++) { 5840d129228SNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 5850d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 586165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 5870d129228SNeilBrown 5880d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 5890d129228SNeilBrown * non-congested targets, it can be removed 5900d129228SNeilBrown */ 59191a9e99dSAlexander Beregalov if ((bits & (1<<BDI_async_congested)) || 1) 5920d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 5930d129228SNeilBrown else 5940d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 5950d129228SNeilBrown } 5960d129228SNeilBrown } 5970d129228SNeilBrown rcu_read_unlock(); 5980d129228SNeilBrown return ret; 5990d129228SNeilBrown } 6000d129228SNeilBrown 6010d129228SNeilBrown 602a35e63efSNeilBrown static int flush_pending_writes(conf_t *conf) 603a35e63efSNeilBrown { 604a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 605a35e63efSNeilBrown * bitmap updates get flushed here. 606a35e63efSNeilBrown * We return 1 if any requests were actually submitted. 607a35e63efSNeilBrown */ 608a35e63efSNeilBrown int rv = 0; 609a35e63efSNeilBrown 610a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 611a35e63efSNeilBrown 612a35e63efSNeilBrown if (conf->pending_bio_list.head) { 613a35e63efSNeilBrown struct bio *bio; 614a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 615a35e63efSNeilBrown blk_remove_plug(conf->mddev->queue); 616a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 617a35e63efSNeilBrown /* flush any pending bitmap writes to 618a35e63efSNeilBrown * disk before proceeding w/ I/O */ 619a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 620a35e63efSNeilBrown 621a35e63efSNeilBrown while (bio) { /* submit pending writes */ 622a35e63efSNeilBrown struct bio *next = bio->bi_next; 623a35e63efSNeilBrown bio->bi_next = NULL; 624a35e63efSNeilBrown generic_make_request(bio); 625a35e63efSNeilBrown bio = next; 626a35e63efSNeilBrown } 627a35e63efSNeilBrown rv = 1; 628a35e63efSNeilBrown } else 629a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 630a35e63efSNeilBrown return rv; 631a35e63efSNeilBrown } 632a35e63efSNeilBrown 63317999be4SNeilBrown /* Barriers.... 63417999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 63517999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 63617999be4SNeilBrown * To do this we raise a 'barrier'. 63717999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 63817999be4SNeilBrown * to count how many activities are happening which preclude 63917999be4SNeilBrown * normal IO. 64017999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 64117999be4SNeilBrown * i.e. if nr_pending == 0. 64217999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 64317999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 64417999be4SNeilBrown * is ready, no other operations which require a barrier will start 64517999be4SNeilBrown * until the IO request has had a chance. 64617999be4SNeilBrown * 64717999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 64817999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 64917999be4SNeilBrown * allow_barrier when it has finished its IO. 65017999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 65117999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 65217999be4SNeilBrown * lower_barrier when the particular background IO completes. 6531da177e4SLinus Torvalds */ 6541da177e4SLinus Torvalds #define RESYNC_DEPTH 32 6551da177e4SLinus Torvalds 65617999be4SNeilBrown static void raise_barrier(conf_t *conf) 6571da177e4SLinus Torvalds { 6581da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 6591da177e4SLinus Torvalds 66017999be4SNeilBrown /* Wait until no block IO is waiting */ 66117999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 66217999be4SNeilBrown conf->resync_lock, 66317999be4SNeilBrown raid1_unplug(conf->mddev->queue)); 66417999be4SNeilBrown 66517999be4SNeilBrown /* block any new IO from starting */ 66617999be4SNeilBrown conf->barrier++; 66717999be4SNeilBrown 66817999be4SNeilBrown /* No wait for all pending IO to complete */ 66917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 67017999be4SNeilBrown !conf->nr_pending && conf->barrier < RESYNC_DEPTH, 67117999be4SNeilBrown conf->resync_lock, 67217999be4SNeilBrown raid1_unplug(conf->mddev->queue)); 67317999be4SNeilBrown 6741da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 6751da177e4SLinus Torvalds } 6761da177e4SLinus Torvalds 67717999be4SNeilBrown static void lower_barrier(conf_t *conf) 67817999be4SNeilBrown { 67917999be4SNeilBrown unsigned long flags; 680709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 68117999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 68217999be4SNeilBrown conf->barrier--; 68317999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 68417999be4SNeilBrown wake_up(&conf->wait_barrier); 68517999be4SNeilBrown } 68617999be4SNeilBrown 68717999be4SNeilBrown static void wait_barrier(conf_t *conf) 68817999be4SNeilBrown { 68917999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 69017999be4SNeilBrown if (conf->barrier) { 69117999be4SNeilBrown conf->nr_waiting++; 69217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->barrier, 69317999be4SNeilBrown conf->resync_lock, 69417999be4SNeilBrown raid1_unplug(conf->mddev->queue)); 69517999be4SNeilBrown conf->nr_waiting--; 69617999be4SNeilBrown } 69717999be4SNeilBrown conf->nr_pending++; 69817999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 69917999be4SNeilBrown } 70017999be4SNeilBrown 70117999be4SNeilBrown static void allow_barrier(conf_t *conf) 70217999be4SNeilBrown { 70317999be4SNeilBrown unsigned long flags; 70417999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 70517999be4SNeilBrown conf->nr_pending--; 70617999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 70717999be4SNeilBrown wake_up(&conf->wait_barrier); 70817999be4SNeilBrown } 70917999be4SNeilBrown 710ddaf22abSNeilBrown static void freeze_array(conf_t *conf) 711ddaf22abSNeilBrown { 712ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 713ddaf22abSNeilBrown * go quite. 714ddaf22abSNeilBrown * We increment barrier and nr_waiting, and then 7151c830532SNeilBrown * wait until nr_pending match nr_queued+1 7161c830532SNeilBrown * This is called in the context of one normal IO request 7171c830532SNeilBrown * that has failed. Thus any sync request that might be pending 7181c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 7191c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 7201c830532SNeilBrown * Thus the number queued (nr_queued) plus this request (1) 7211c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 7221c830532SNeilBrown * we continue. 723ddaf22abSNeilBrown */ 724ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 725ddaf22abSNeilBrown conf->barrier++; 726ddaf22abSNeilBrown conf->nr_waiting++; 727ddaf22abSNeilBrown wait_event_lock_irq(conf->wait_barrier, 7281c830532SNeilBrown conf->nr_pending == conf->nr_queued+1, 729ddaf22abSNeilBrown conf->resync_lock, 730a35e63efSNeilBrown ({ flush_pending_writes(conf); 731a35e63efSNeilBrown raid1_unplug(conf->mddev->queue); })); 732ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 733ddaf22abSNeilBrown } 734ddaf22abSNeilBrown static void unfreeze_array(conf_t *conf) 735ddaf22abSNeilBrown { 736ddaf22abSNeilBrown /* reverse the effect of the freeze */ 737ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 738ddaf22abSNeilBrown conf->barrier--; 739ddaf22abSNeilBrown conf->nr_waiting--; 740ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 741ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 742ddaf22abSNeilBrown } 743ddaf22abSNeilBrown 74417999be4SNeilBrown 7454b6d287fSNeilBrown /* duplicate the data pages for behind I/O */ 7464b6d287fSNeilBrown static struct page **alloc_behind_pages(struct bio *bio) 7474b6d287fSNeilBrown { 7484b6d287fSNeilBrown int i; 7494b6d287fSNeilBrown struct bio_vec *bvec; 7509ffae0cfSNeilBrown struct page **pages = kzalloc(bio->bi_vcnt * sizeof(struct page *), 7514b6d287fSNeilBrown GFP_NOIO); 7524b6d287fSNeilBrown if (unlikely(!pages)) 7534b6d287fSNeilBrown goto do_sync_io; 7544b6d287fSNeilBrown 7554b6d287fSNeilBrown bio_for_each_segment(bvec, bio, i) { 7564b6d287fSNeilBrown pages[i] = alloc_page(GFP_NOIO); 7574b6d287fSNeilBrown if (unlikely(!pages[i])) 7584b6d287fSNeilBrown goto do_sync_io; 7594b6d287fSNeilBrown memcpy(kmap(pages[i]) + bvec->bv_offset, 7604b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 7614b6d287fSNeilBrown kunmap(pages[i]); 7624b6d287fSNeilBrown kunmap(bvec->bv_page); 7634b6d287fSNeilBrown } 7644b6d287fSNeilBrown 7654b6d287fSNeilBrown return pages; 7664b6d287fSNeilBrown 7674b6d287fSNeilBrown do_sync_io: 7684b6d287fSNeilBrown if (pages) 7694b6d287fSNeilBrown for (i = 0; i < bio->bi_vcnt && pages[i]; i++) 7702d1f3b5dSNeilBrown put_page(pages[i]); 7714b6d287fSNeilBrown kfree(pages); 7724b6d287fSNeilBrown PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); 7734b6d287fSNeilBrown return NULL; 7744b6d287fSNeilBrown } 7754b6d287fSNeilBrown 77621a52c6dSNeilBrown static int make_request(mddev_t *mddev, struct bio * bio) 7771da177e4SLinus Torvalds { 778070ec55dSNeilBrown conf_t *conf = mddev->private; 7791da177e4SLinus Torvalds mirror_info_t *mirror; 7801da177e4SLinus Torvalds r1bio_t *r1_bio; 7811da177e4SLinus Torvalds struct bio *read_bio; 782191ea9b2SNeilBrown int i, targets = 0, disks; 78384255d10SNeilBrown struct bitmap *bitmap; 784191ea9b2SNeilBrown unsigned long flags; 785191ea9b2SNeilBrown struct bio_list bl; 7864b6d287fSNeilBrown struct page **behind_pages = NULL; 787a362357bSJens Axboe const int rw = bio_data_dir(bio); 7881f98a13fSJens Axboe const bool do_sync = bio_rw_flagged(bio, BIO_RW_SYNCIO); 7891f98a13fSJens Axboe bool do_barriers; 7906bfe0b49SDan Williams mdk_rdev_t *blocked_rdev; 791191ea9b2SNeilBrown 7921da177e4SLinus Torvalds /* 7931da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 7941da177e4SLinus Torvalds * thread has put up a bar for new requests. 7951da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 79662de608dSNeilBrown * We test barriers_work *after* md_write_start as md_write_start 79762de608dSNeilBrown * may cause the first superblock write, and that will check out 79862de608dSNeilBrown * if barriers work. 7991da177e4SLinus Torvalds */ 80062de608dSNeilBrown 8013d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 8023d310eb7SNeilBrown 8036eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 8046eef4b21SNeilBrown bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && 8056eef4b21SNeilBrown bio->bi_sector < mddev->suspend_hi) { 8066eef4b21SNeilBrown /* As the suspend_* range is controlled by 8076eef4b21SNeilBrown * userspace, we want an interruptible 8086eef4b21SNeilBrown * wait. 8096eef4b21SNeilBrown */ 8106eef4b21SNeilBrown DEFINE_WAIT(w); 8116eef4b21SNeilBrown for (;;) { 8126eef4b21SNeilBrown flush_signals(current); 8136eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 8146eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 8156eef4b21SNeilBrown if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || 8166eef4b21SNeilBrown bio->bi_sector >= mddev->suspend_hi) 8176eef4b21SNeilBrown break; 8186eef4b21SNeilBrown schedule(); 8196eef4b21SNeilBrown } 8206eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 8216eef4b21SNeilBrown } 8221f98a13fSJens Axboe if (unlikely(!mddev->barriers_work && 8231f98a13fSJens Axboe bio_rw_flagged(bio, BIO_RW_BARRIER))) { 82462de608dSNeilBrown if (rw == WRITE) 82562de608dSNeilBrown md_write_end(mddev); 8266712ecf8SNeilBrown bio_endio(bio, -EOPNOTSUPP); 82762de608dSNeilBrown return 0; 82862de608dSNeilBrown } 82962de608dSNeilBrown 83017999be4SNeilBrown wait_barrier(conf); 8311da177e4SLinus Torvalds 83284255d10SNeilBrown bitmap = mddev->bitmap; 83384255d10SNeilBrown 8341da177e4SLinus Torvalds /* 8351da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 8361da177e4SLinus Torvalds * used and no empty request is available. 8371da177e4SLinus Torvalds * 8381da177e4SLinus Torvalds */ 8391da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds r1_bio->master_bio = bio; 8421da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 843191ea9b2SNeilBrown r1_bio->state = 0; 8441da177e4SLinus Torvalds r1_bio->mddev = mddev; 8451da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 8461da177e4SLinus Torvalds 847a362357bSJens Axboe if (rw == READ) { 8481da177e4SLinus Torvalds /* 8491da177e4SLinus Torvalds * read balancing logic: 8501da177e4SLinus Torvalds */ 8511da177e4SLinus Torvalds int rdisk = read_balance(conf, r1_bio); 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvalds if (rdisk < 0) { 8541da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 8551da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 8561da177e4SLinus Torvalds return 0; 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 8591da177e4SLinus Torvalds 8601da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds read_bio = bio_clone(bio, GFP_NOIO); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 8671da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 8681da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 8691ef04fefSDmitry Monakhov read_bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO); 8701da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 8711da177e4SLinus Torvalds 8721da177e4SLinus Torvalds generic_make_request(read_bio); 8731da177e4SLinus Torvalds return 0; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds 8761da177e4SLinus Torvalds /* 8771da177e4SLinus Torvalds * WRITE: 8781da177e4SLinus Torvalds */ 8791da177e4SLinus Torvalds /* first select target devices under spinlock and 8801da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 8811da177e4SLinus Torvalds * bios[x] to bio 8821da177e4SLinus Torvalds */ 8831da177e4SLinus Torvalds disks = conf->raid_disks; 884191ea9b2SNeilBrown #if 0 885191ea9b2SNeilBrown { static int first=1; 886191ea9b2SNeilBrown if (first) printk("First Write sector %llu disks %d\n", 887191ea9b2SNeilBrown (unsigned long long)r1_bio->sector, disks); 888191ea9b2SNeilBrown first = 0; 889191ea9b2SNeilBrown } 890191ea9b2SNeilBrown #endif 8916bfe0b49SDan Williams retry_write: 8926bfe0b49SDan Williams blocked_rdev = NULL; 8931da177e4SLinus Torvalds rcu_read_lock(); 8941da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 8956bfe0b49SDan Williams mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 8966bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 8976bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 8986bfe0b49SDan Williams blocked_rdev = rdev; 8996bfe0b49SDan Williams break; 9006bfe0b49SDan Williams } 9016bfe0b49SDan Williams if (rdev && !test_bit(Faulty, &rdev->flags)) { 9021da177e4SLinus Torvalds atomic_inc(&rdev->nr_pending); 903b2d444d7SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 90403c902e1SNeilBrown rdev_dec_pending(rdev, mddev); 9051da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 906964147d5SNeilBrown } else { 9071da177e4SLinus Torvalds r1_bio->bios[i] = bio; 908191ea9b2SNeilBrown targets++; 909964147d5SNeilBrown } 9101da177e4SLinus Torvalds } else 9111da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds rcu_read_unlock(); 9141da177e4SLinus Torvalds 9156bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 9166bfe0b49SDan Williams /* Wait for this device to become unblocked */ 9176bfe0b49SDan Williams int j; 9186bfe0b49SDan Williams 9196bfe0b49SDan Williams for (j = 0; j < i; j++) 9206bfe0b49SDan Williams if (r1_bio->bios[j]) 9216bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 9226bfe0b49SDan Williams 9236bfe0b49SDan Williams allow_barrier(conf); 9246bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 9256bfe0b49SDan Williams wait_barrier(conf); 9266bfe0b49SDan Williams goto retry_write; 9276bfe0b49SDan Williams } 9286bfe0b49SDan Williams 9294b6d287fSNeilBrown BUG_ON(targets == 0); /* we never fail the last device */ 9304b6d287fSNeilBrown 931191ea9b2SNeilBrown if (targets < conf->raid_disks) { 932191ea9b2SNeilBrown /* array is degraded, we will not clear the bitmap 933191ea9b2SNeilBrown * on I/O completion (see raid1_end_write_request) */ 934191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 935191ea9b2SNeilBrown } 93606d91a5fSNeilBrown 9374b6d287fSNeilBrown /* do behind I/O ? */ 9384b6d287fSNeilBrown if (bitmap && 93942a04b50SNeilBrown (atomic_read(&bitmap->behind_writes) 94042a04b50SNeilBrown < mddev->bitmap_info.max_write_behind) && 9414b6d287fSNeilBrown (behind_pages = alloc_behind_pages(bio)) != NULL) 9424b6d287fSNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 9434b6d287fSNeilBrown 944191ea9b2SNeilBrown atomic_set(&r1_bio->remaining, 0); 9454b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 946191ea9b2SNeilBrown 9471f98a13fSJens Axboe do_barriers = bio_rw_flagged(bio, BIO_RW_BARRIER); 948a9701a30SNeilBrown if (do_barriers) 949a9701a30SNeilBrown set_bit(R1BIO_Barrier, &r1_bio->state); 950a9701a30SNeilBrown 951191ea9b2SNeilBrown bio_list_init(&bl); 9521da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 9531da177e4SLinus Torvalds struct bio *mbio; 9541da177e4SLinus Torvalds if (!r1_bio->bios[i]) 9551da177e4SLinus Torvalds continue; 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds mbio = bio_clone(bio, GFP_NOIO); 9581da177e4SLinus Torvalds r1_bio->bios[i] = mbio; 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; 9611da177e4SLinus Torvalds mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 9621da177e4SLinus Torvalds mbio->bi_end_io = raid1_end_write_request; 9631ef04fefSDmitry Monakhov mbio->bi_rw = WRITE | (do_barriers << BIO_RW_BARRIER) | 9641ef04fefSDmitry Monakhov (do_sync << BIO_RW_SYNCIO); 9651da177e4SLinus Torvalds mbio->bi_private = r1_bio; 9661da177e4SLinus Torvalds 9674b6d287fSNeilBrown if (behind_pages) { 9684b6d287fSNeilBrown struct bio_vec *bvec; 9694b6d287fSNeilBrown int j; 9704b6d287fSNeilBrown 9714b6d287fSNeilBrown /* Yes, I really want the '__' version so that 9724b6d287fSNeilBrown * we clear any unused pointer in the io_vec, rather 9734b6d287fSNeilBrown * than leave them unchanged. This is important 9744b6d287fSNeilBrown * because when we come to free the pages, we won't 9754b6d287fSNeilBrown * know the originial bi_idx, so we just free 9764b6d287fSNeilBrown * them all 9774b6d287fSNeilBrown */ 9784b6d287fSNeilBrown __bio_for_each_segment(bvec, mbio, j, 0) 9794b6d287fSNeilBrown bvec->bv_page = behind_pages[j]; 9804b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 9814b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 9824b6d287fSNeilBrown } 9834b6d287fSNeilBrown 9841da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 985191ea9b2SNeilBrown 986191ea9b2SNeilBrown bio_list_add(&bl, mbio); 9871da177e4SLinus Torvalds } 9884b6d287fSNeilBrown kfree(behind_pages); /* the behind pages are attached to the bios now */ 9891da177e4SLinus Torvalds 9904b6d287fSNeilBrown bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors, 9914b6d287fSNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 992191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 993191ea9b2SNeilBrown bio_list_merge(&conf->pending_bio_list, &bl); 994191ea9b2SNeilBrown bio_list_init(&bl); 995191ea9b2SNeilBrown 996191ea9b2SNeilBrown blk_plug_device(mddev->queue); 997191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 998191ea9b2SNeilBrown 999a35e63efSNeilBrown /* In case raid1d snuck into freeze_array */ 1000a35e63efSNeilBrown wake_up(&conf->wait_barrier); 1001a35e63efSNeilBrown 1002e3881a68SLars Ellenberg if (do_sync) 1003e3881a68SLars Ellenberg md_wakeup_thread(mddev->thread); 1004191ea9b2SNeilBrown #if 0 1005191ea9b2SNeilBrown while ((bio = bio_list_pop(&bl)) != NULL) 1006191ea9b2SNeilBrown generic_make_request(bio); 1007191ea9b2SNeilBrown #endif 10081da177e4SLinus Torvalds 10091da177e4SLinus Torvalds return 0; 10101da177e4SLinus Torvalds } 10111da177e4SLinus Torvalds 10121da177e4SLinus Torvalds static void status(struct seq_file *seq, mddev_t *mddev) 10131da177e4SLinus Torvalds { 1014070ec55dSNeilBrown conf_t *conf = mddev->private; 10151da177e4SLinus Torvalds int i; 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 101811ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1019ddac7c7eSNeilBrown rcu_read_lock(); 1020ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 1021ddac7c7eSNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 10221da177e4SLinus Torvalds seq_printf(seq, "%s", 1023ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1024ddac7c7eSNeilBrown } 1025ddac7c7eSNeilBrown rcu_read_unlock(); 10261da177e4SLinus Torvalds seq_printf(seq, "]"); 10271da177e4SLinus Torvalds } 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds 10301da177e4SLinus Torvalds static void error(mddev_t *mddev, mdk_rdev_t *rdev) 10311da177e4SLinus Torvalds { 10321da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1033070ec55dSNeilBrown conf_t *conf = mddev->private; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds /* 10361da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 10371da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 10381da177e4SLinus Torvalds * next level up know. 10391da177e4SLinus Torvalds * else mark the drive as failed 10401da177e4SLinus Torvalds */ 1041b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 10424044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 10431da177e4SLinus Torvalds /* 10441da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 10454044ba58SNeilBrown * normal single drive. 10464044ba58SNeilBrown * However don't try a recovery from this drive as 10474044ba58SNeilBrown * it is very likely to fail. 10481da177e4SLinus Torvalds */ 10494044ba58SNeilBrown mddev->recovery_disabled = 1; 10501da177e4SLinus Torvalds return; 10514044ba58SNeilBrown } 1052c04be0aaSNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 1053c04be0aaSNeilBrown unsigned long flags; 1054c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 10551da177e4SLinus Torvalds mddev->degraded++; 1056dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1057c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 10581da177e4SLinus Torvalds /* 10591da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 10601da177e4SLinus Torvalds */ 1061dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1062dd00a99eSNeilBrown } else 1063b2d444d7SNeilBrown set_bit(Faulty, &rdev->flags); 1064850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 10651da177e4SLinus Torvalds printk(KERN_ALERT "raid1: Disk failure on %s, disabling device.\n" 1066d7a420c9SNick Andrew "raid1: Operation continuing on %d devices.\n", 106711ce99e6SNeilBrown bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded); 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds static void print_conf(conf_t *conf) 10711da177e4SLinus Torvalds { 10721da177e4SLinus Torvalds int i; 10731da177e4SLinus Torvalds 10741da177e4SLinus Torvalds printk("RAID1 conf printout:\n"); 10751da177e4SLinus Torvalds if (!conf) { 10761da177e4SLinus Torvalds printk("(!conf)\n"); 10771da177e4SLinus Torvalds return; 10781da177e4SLinus Torvalds } 107911ce99e6SNeilBrown printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 10801da177e4SLinus Torvalds conf->raid_disks); 10811da177e4SLinus Torvalds 1082ddac7c7eSNeilBrown rcu_read_lock(); 10831da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 10841da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1085ddac7c7eSNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 1086ddac7c7eSNeilBrown if (rdev) 10871da177e4SLinus Torvalds printk(" disk %d, wo:%d, o:%d, dev:%s\n", 1088ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1089ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1090ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 10911da177e4SLinus Torvalds } 1092ddac7c7eSNeilBrown rcu_read_unlock(); 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds static void close_sync(conf_t *conf) 10961da177e4SLinus Torvalds { 109717999be4SNeilBrown wait_barrier(conf); 109817999be4SNeilBrown allow_barrier(conf); 10991da177e4SLinus Torvalds 11001da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 11011da177e4SLinus Torvalds conf->r1buf_pool = NULL; 11021da177e4SLinus Torvalds } 11031da177e4SLinus Torvalds 11041da177e4SLinus Torvalds static int raid1_spare_active(mddev_t *mddev) 11051da177e4SLinus Torvalds { 11061da177e4SLinus Torvalds int i; 11071da177e4SLinus Torvalds conf_t *conf = mddev->private; 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds /* 11101da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1111ddac7c7eSNeilBrown * and mark them readable. 1112ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 11131da177e4SLinus Torvalds */ 11141da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 1115ddac7c7eSNeilBrown mdk_rdev_t *rdev = conf->mirrors[i].rdev; 1116ddac7c7eSNeilBrown if (rdev 1117ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1118c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 1119c04be0aaSNeilBrown unsigned long flags; 1120c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 11211da177e4SLinus Torvalds mddev->degraded--; 1122c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 11231da177e4SLinus Torvalds } 11241da177e4SLinus Torvalds } 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds print_conf(conf); 11271da177e4SLinus Torvalds return 0; 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds 11311da177e4SLinus Torvalds static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) 11321da177e4SLinus Torvalds { 11331da177e4SLinus Torvalds conf_t *conf = mddev->private; 1134199050eaSNeil Brown int err = -EEXIST; 113541158c7eSNeilBrown int mirror = 0; 11361da177e4SLinus Torvalds mirror_info_t *p; 11376c2fce2eSNeil Brown int first = 0; 11386c2fce2eSNeil Brown int last = mddev->raid_disks - 1; 11391da177e4SLinus Torvalds 11406c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 11416c2fce2eSNeil Brown first = last = rdev->raid_disk; 11426c2fce2eSNeil Brown 11436c2fce2eSNeil Brown for (mirror = first; mirror <= last; mirror++) 11441da177e4SLinus Torvalds if ( !(p=conf->mirrors+mirror)->rdev) { 11451da177e4SLinus Torvalds 11468f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 11478f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 1148627a2d3cSNeilBrown /* as we don't honour merge_bvec_fn, we must 1149627a2d3cSNeilBrown * never risk violating it, so limit 1150627a2d3cSNeilBrown * ->max_segments to one lying with a single 1151627a2d3cSNeilBrown * page, as a one page request is never in 1152627a2d3cSNeilBrown * violation. 11531da177e4SLinus Torvalds */ 1154627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 1155627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 1156627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 1157627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 1158627a2d3cSNeilBrown } 11591da177e4SLinus Torvalds 11601da177e4SLinus Torvalds p->head_position = 0; 11611da177e4SLinus Torvalds rdev->raid_disk = mirror; 1162199050eaSNeil Brown err = 0; 11636aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 11646aea114aSNeilBrown * if this was recently any drive of the array 11656aea114aSNeilBrown */ 11666aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 116741158c7eSNeilBrown conf->fullsync = 1; 1168d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 11691da177e4SLinus Torvalds break; 11701da177e4SLinus Torvalds } 1171ac5e7113SAndre Noll md_integrity_add_rdev(rdev, mddev); 11721da177e4SLinus Torvalds print_conf(conf); 1173199050eaSNeil Brown return err; 11741da177e4SLinus Torvalds } 11751da177e4SLinus Torvalds 11761da177e4SLinus Torvalds static int raid1_remove_disk(mddev_t *mddev, int number) 11771da177e4SLinus Torvalds { 11781da177e4SLinus Torvalds conf_t *conf = mddev->private; 11791da177e4SLinus Torvalds int err = 0; 11801da177e4SLinus Torvalds mdk_rdev_t *rdev; 11811da177e4SLinus Torvalds mirror_info_t *p = conf->mirrors+ number; 11821da177e4SLinus Torvalds 11831da177e4SLinus Torvalds print_conf(conf); 11841da177e4SLinus Torvalds rdev = p->rdev; 11851da177e4SLinus Torvalds if (rdev) { 1186b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 11871da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 11881da177e4SLinus Torvalds err = -EBUSY; 11891da177e4SLinus Torvalds goto abort; 11901da177e4SLinus Torvalds } 1191dfc70645SNeilBrown /* Only remove non-faulty devices is recovery 1192dfc70645SNeilBrown * is not possible. 1193dfc70645SNeilBrown */ 1194dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 1195dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1196dfc70645SNeilBrown err = -EBUSY; 1197dfc70645SNeilBrown goto abort; 1198dfc70645SNeilBrown } 11991da177e4SLinus Torvalds p->rdev = NULL; 1200fbd568a3SPaul E. McKenney synchronize_rcu(); 12011da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 12021da177e4SLinus Torvalds /* lost the race, try later */ 12031da177e4SLinus Torvalds err = -EBUSY; 12041da177e4SLinus Torvalds p->rdev = rdev; 1205ac5e7113SAndre Noll goto abort; 12061da177e4SLinus Torvalds } 1207ac5e7113SAndre Noll md_integrity_register(mddev); 12081da177e4SLinus Torvalds } 12091da177e4SLinus Torvalds abort: 12101da177e4SLinus Torvalds 12111da177e4SLinus Torvalds print_conf(conf); 12121da177e4SLinus Torvalds return err; 12131da177e4SLinus Torvalds } 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds 12166712ecf8SNeilBrown static void end_sync_read(struct bio *bio, int error) 12171da177e4SLinus Torvalds { 12187b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 1219d11c171eSNeilBrown int i; 12201da177e4SLinus Torvalds 1221d11c171eSNeilBrown for (i=r1_bio->mddev->raid_disks; i--; ) 1222d11c171eSNeilBrown if (r1_bio->bios[i] == bio) 1223d11c171eSNeilBrown break; 1224d11c171eSNeilBrown BUG_ON(i < 0); 1225d11c171eSNeilBrown update_head_pos(i, r1_bio); 12261da177e4SLinus Torvalds /* 12271da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 12281da177e4SLinus Torvalds * or re-read if the read failed. 12291da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 12301da177e4SLinus Torvalds */ 123169382e85SNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags)) 12321da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1233d11c171eSNeilBrown 1234d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 12351da177e4SLinus Torvalds reschedule_retry(r1_bio); 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 12386712ecf8SNeilBrown static void end_sync_write(struct bio *bio, int error) 12391da177e4SLinus Torvalds { 12401da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 12417b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 12421da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 1243070ec55dSNeilBrown conf_t *conf = mddev->private; 12441da177e4SLinus Torvalds int i; 12451da177e4SLinus Torvalds int mirror=0; 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) 12481da177e4SLinus Torvalds if (r1_bio->bios[i] == bio) { 12491da177e4SLinus Torvalds mirror = i; 12501da177e4SLinus Torvalds break; 12511da177e4SLinus Torvalds } 12526b1117d5SNeilBrown if (!uptodate) { 12536b1117d5SNeilBrown int sync_blocks = 0; 12546b1117d5SNeilBrown sector_t s = r1_bio->sector; 12556b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 12566b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 12576b1117d5SNeilBrown do { 12585e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 12596b1117d5SNeilBrown &sync_blocks, 1); 12606b1117d5SNeilBrown s += sync_blocks; 12616b1117d5SNeilBrown sectors_to_go -= sync_blocks; 12626b1117d5SNeilBrown } while (sectors_to_go > 0); 12631da177e4SLinus Torvalds md_error(mddev, conf->mirrors[mirror].rdev); 12646b1117d5SNeilBrown } 1265e3b9703eSNeilBrown 12661da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 12671da177e4SLinus Torvalds 12681da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 126973d5c38aSNeilBrown sector_t s = r1_bio->sectors; 12701da177e4SLinus Torvalds put_buf(r1_bio); 127173d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 12721da177e4SLinus Torvalds } 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds 12751da177e4SLinus Torvalds static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) 12761da177e4SLinus Torvalds { 1277070ec55dSNeilBrown conf_t *conf = mddev->private; 12781da177e4SLinus Torvalds int i; 12791da177e4SLinus Torvalds int disks = conf->raid_disks; 12801da177e4SLinus Torvalds struct bio *bio, *wbio; 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds bio = r1_bio->bios[r1_bio->read_disk]; 12831da177e4SLinus Torvalds 128469382e85SNeilBrown 1285d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 1286d11c171eSNeilBrown /* We have read all readable devices. If we haven't 1287d11c171eSNeilBrown * got the block, then there is no hope left. 1288d11c171eSNeilBrown * If we have, then we want to do a comparison 1289d11c171eSNeilBrown * and skip the write if everything is the same. 1290d11c171eSNeilBrown * If any blocks failed to read, then we need to 1291d11c171eSNeilBrown * attempt an over-write 12921da177e4SLinus Torvalds */ 1293d11c171eSNeilBrown int primary; 1294d11c171eSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { 1295d11c171eSNeilBrown for (i=0; i<mddev->raid_disks; i++) 1296d11c171eSNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_read) 1297d11c171eSNeilBrown md_error(mddev, conf->mirrors[i].rdev); 1298d11c171eSNeilBrown 1299d11c171eSNeilBrown md_done_sync(mddev, r1_bio->sectors, 1); 1300d11c171eSNeilBrown put_buf(r1_bio); 1301d11c171eSNeilBrown return; 1302d11c171eSNeilBrown } 1303d11c171eSNeilBrown for (primary=0; primary<mddev->raid_disks; primary++) 1304d11c171eSNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 1305d11c171eSNeilBrown test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { 1306d11c171eSNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 130703c902e1SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1308d11c171eSNeilBrown break; 1309d11c171eSNeilBrown } 1310d11c171eSNeilBrown r1_bio->read_disk = primary; 1311d11c171eSNeilBrown for (i=0; i<mddev->raid_disks; i++) 1312ed456662SMike Accetta if (r1_bio->bios[i]->bi_end_io == end_sync_read) { 1313d11c171eSNeilBrown int j; 1314d11c171eSNeilBrown int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); 1315d11c171eSNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1316d11c171eSNeilBrown struct bio *sbio = r1_bio->bios[i]; 1317ed456662SMike Accetta 1318ed456662SMike Accetta if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { 1319ed456662SMike Accetta for (j = vcnt; j-- ; ) { 1320ed456662SMike Accetta struct page *p, *s; 1321ed456662SMike Accetta p = pbio->bi_io_vec[j].bv_page; 1322ed456662SMike Accetta s = sbio->bi_io_vec[j].bv_page; 1323ed456662SMike Accetta if (memcmp(page_address(p), 1324ed456662SMike Accetta page_address(s), 1325d11c171eSNeilBrown PAGE_SIZE)) 1326d11c171eSNeilBrown break; 1327ed456662SMike Accetta } 1328ed456662SMike Accetta } else 1329ed456662SMike Accetta j = 0; 1330d11c171eSNeilBrown if (j >= 0) 1331d11c171eSNeilBrown mddev->resync_mismatches += r1_bio->sectors; 1332cf7a4416SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 1333cf7a4416SNeilBrown && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { 1334d11c171eSNeilBrown sbio->bi_end_io = NULL; 133503c902e1SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 133603c902e1SNeilBrown } else { 1337d11c171eSNeilBrown /* fixup the bio for reuse */ 1338698b18c1SNeilBrown int size; 1339d11c171eSNeilBrown sbio->bi_vcnt = vcnt; 1340d11c171eSNeilBrown sbio->bi_size = r1_bio->sectors << 9; 1341d11c171eSNeilBrown sbio->bi_idx = 0; 1342d11c171eSNeilBrown sbio->bi_phys_segments = 0; 1343d11c171eSNeilBrown sbio->bi_flags &= ~(BIO_POOL_MASK - 1); 1344d11c171eSNeilBrown sbio->bi_flags |= 1 << BIO_UPTODATE; 1345d11c171eSNeilBrown sbio->bi_next = NULL; 1346d11c171eSNeilBrown sbio->bi_sector = r1_bio->sector + 1347d11c171eSNeilBrown conf->mirrors[i].rdev->data_offset; 1348d11c171eSNeilBrown sbio->bi_bdev = conf->mirrors[i].rdev->bdev; 1349698b18c1SNeilBrown size = sbio->bi_size; 1350698b18c1SNeilBrown for (j = 0; j < vcnt ; j++) { 1351698b18c1SNeilBrown struct bio_vec *bi; 1352698b18c1SNeilBrown bi = &sbio->bi_io_vec[j]; 1353698b18c1SNeilBrown bi->bv_offset = 0; 1354698b18c1SNeilBrown if (size > PAGE_SIZE) 1355698b18c1SNeilBrown bi->bv_len = PAGE_SIZE; 1356698b18c1SNeilBrown else 1357698b18c1SNeilBrown bi->bv_len = size; 1358698b18c1SNeilBrown size -= PAGE_SIZE; 1359698b18c1SNeilBrown memcpy(page_address(bi->bv_page), 13603eda22d1SNeilBrown page_address(pbio->bi_io_vec[j].bv_page), 13613eda22d1SNeilBrown PAGE_SIZE); 1362698b18c1SNeilBrown } 13633eda22d1SNeilBrown 1364d11c171eSNeilBrown } 1365d11c171eSNeilBrown } 1366d11c171eSNeilBrown } 13671da177e4SLinus Torvalds if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { 136869382e85SNeilBrown /* ouch - failed to read all of that. 136969382e85SNeilBrown * Try some synchronous reads of other devices to get 137069382e85SNeilBrown * good data, much like with normal read errors. Only 1371ddac7c7eSNeilBrown * read into the pages we already have so we don't 137269382e85SNeilBrown * need to re-issue the read request. 137369382e85SNeilBrown * We don't need to freeze the array, because being in an 137469382e85SNeilBrown * active sync request, there is no normal IO, and 137569382e85SNeilBrown * no overlapping syncs. 13761da177e4SLinus Torvalds */ 137769382e85SNeilBrown sector_t sect = r1_bio->sector; 137869382e85SNeilBrown int sectors = r1_bio->sectors; 137969382e85SNeilBrown int idx = 0; 138069382e85SNeilBrown 138169382e85SNeilBrown while(sectors) { 138269382e85SNeilBrown int s = sectors; 138369382e85SNeilBrown int d = r1_bio->read_disk; 138469382e85SNeilBrown int success = 0; 138569382e85SNeilBrown mdk_rdev_t *rdev; 138669382e85SNeilBrown 138769382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 138869382e85SNeilBrown s = PAGE_SIZE >> 9; 138969382e85SNeilBrown do { 139069382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1391ddac7c7eSNeilBrown /* No rcu protection needed here devices 1392ddac7c7eSNeilBrown * can only be removed when no resync is 1393ddac7c7eSNeilBrown * active, and resync is currently active 1394ddac7c7eSNeilBrown */ 139569382e85SNeilBrown rdev = conf->mirrors[d].rdev; 139669382e85SNeilBrown if (sync_page_io(rdev->bdev, 139769382e85SNeilBrown sect + rdev->data_offset, 139869382e85SNeilBrown s<<9, 139969382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 140069382e85SNeilBrown READ)) { 140169382e85SNeilBrown success = 1; 140269382e85SNeilBrown break; 140369382e85SNeilBrown } 140469382e85SNeilBrown } 140569382e85SNeilBrown d++; 140669382e85SNeilBrown if (d == conf->raid_disks) 140769382e85SNeilBrown d = 0; 140869382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 140969382e85SNeilBrown 141069382e85SNeilBrown if (success) { 1411097426f6SNeilBrown int start = d; 141269382e85SNeilBrown /* write it back and re-read */ 141369382e85SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 141469382e85SNeilBrown while (d != r1_bio->read_disk) { 141569382e85SNeilBrown if (d == 0) 141669382e85SNeilBrown d = conf->raid_disks; 141769382e85SNeilBrown d--; 141869382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 141969382e85SNeilBrown continue; 142069382e85SNeilBrown rdev = conf->mirrors[d].rdev; 14214dbcdc75SNeilBrown atomic_add(s, &rdev->corrected_errors); 142269382e85SNeilBrown if (sync_page_io(rdev->bdev, 142369382e85SNeilBrown sect + rdev->data_offset, 142469382e85SNeilBrown s<<9, 142569382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1426097426f6SNeilBrown WRITE) == 0) 1427097426f6SNeilBrown md_error(mddev, rdev); 1428097426f6SNeilBrown } 1429097426f6SNeilBrown d = start; 1430097426f6SNeilBrown while (d != r1_bio->read_disk) { 1431097426f6SNeilBrown if (d == 0) 1432097426f6SNeilBrown d = conf->raid_disks; 1433097426f6SNeilBrown d--; 1434097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1435097426f6SNeilBrown continue; 1436097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1437097426f6SNeilBrown if (sync_page_io(rdev->bdev, 143869382e85SNeilBrown sect + rdev->data_offset, 143969382e85SNeilBrown s<<9, 144069382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1441097426f6SNeilBrown READ) == 0) 144269382e85SNeilBrown md_error(mddev, rdev); 144369382e85SNeilBrown } 144469382e85SNeilBrown } else { 14451da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 144669382e85SNeilBrown /* Cannot read from anywhere, array is toast */ 144769382e85SNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 14481da177e4SLinus Torvalds printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" 14491da177e4SLinus Torvalds " for block %llu\n", 14501da177e4SLinus Torvalds bdevname(bio->bi_bdev,b), 14511da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 14521da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 0); 14531da177e4SLinus Torvalds put_buf(r1_bio); 14541da177e4SLinus Torvalds return; 14551da177e4SLinus Torvalds } 145669382e85SNeilBrown sectors -= s; 145769382e85SNeilBrown sect += s; 145869382e85SNeilBrown idx ++; 145969382e85SNeilBrown } 146069382e85SNeilBrown } 1461d11c171eSNeilBrown 1462d11c171eSNeilBrown /* 1463d11c171eSNeilBrown * schedule writes 1464d11c171eSNeilBrown */ 14651da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 14661da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 14671da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 14683e198f78SNeilBrown if (wbio->bi_end_io == NULL || 14693e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 14703e198f78SNeilBrown (i == r1_bio->read_disk || 14713e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 14721da177e4SLinus Torvalds continue; 14731da177e4SLinus Torvalds 14743e198f78SNeilBrown wbio->bi_rw = WRITE; 14753e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 14761da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 14771da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 1478191ea9b2SNeilBrown 14791da177e4SLinus Torvalds generic_make_request(wbio); 14801da177e4SLinus Torvalds } 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 1483191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 14841da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 1); 14851da177e4SLinus Torvalds put_buf(r1_bio); 14861da177e4SLinus Torvalds } 14871da177e4SLinus Torvalds } 14881da177e4SLinus Torvalds 14891da177e4SLinus Torvalds /* 14901da177e4SLinus Torvalds * This is a kernel thread which: 14911da177e4SLinus Torvalds * 14921da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 14931da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 14941da177e4SLinus Torvalds * 3. Performs writes following reads for array syncronising. 14951da177e4SLinus Torvalds */ 14961da177e4SLinus Torvalds 1497867868fbSNeilBrown static void fix_read_error(conf_t *conf, int read_disk, 1498867868fbSNeilBrown sector_t sect, int sectors) 1499867868fbSNeilBrown { 1500867868fbSNeilBrown mddev_t *mddev = conf->mddev; 1501867868fbSNeilBrown while(sectors) { 1502867868fbSNeilBrown int s = sectors; 1503867868fbSNeilBrown int d = read_disk; 1504867868fbSNeilBrown int success = 0; 1505867868fbSNeilBrown int start; 1506867868fbSNeilBrown mdk_rdev_t *rdev; 1507867868fbSNeilBrown 1508867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 1509867868fbSNeilBrown s = PAGE_SIZE >> 9; 1510867868fbSNeilBrown 1511867868fbSNeilBrown do { 1512867868fbSNeilBrown /* Note: no rcu protection needed here 1513867868fbSNeilBrown * as this is synchronous in the raid1d thread 1514867868fbSNeilBrown * which is the thread that might remove 1515867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 1516867868fbSNeilBrown */ 1517867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1518867868fbSNeilBrown if (rdev && 1519867868fbSNeilBrown test_bit(In_sync, &rdev->flags) && 1520867868fbSNeilBrown sync_page_io(rdev->bdev, 1521867868fbSNeilBrown sect + rdev->data_offset, 1522867868fbSNeilBrown s<<9, 1523867868fbSNeilBrown conf->tmppage, READ)) 1524867868fbSNeilBrown success = 1; 1525867868fbSNeilBrown else { 1526867868fbSNeilBrown d++; 1527867868fbSNeilBrown if (d == conf->raid_disks) 1528867868fbSNeilBrown d = 0; 1529867868fbSNeilBrown } 1530867868fbSNeilBrown } while (!success && d != read_disk); 1531867868fbSNeilBrown 1532867868fbSNeilBrown if (!success) { 1533867868fbSNeilBrown /* Cannot read from anywhere -- bye bye array */ 1534867868fbSNeilBrown md_error(mddev, conf->mirrors[read_disk].rdev); 1535867868fbSNeilBrown break; 1536867868fbSNeilBrown } 1537867868fbSNeilBrown /* write it back and re-read */ 1538867868fbSNeilBrown start = d; 1539867868fbSNeilBrown while (d != read_disk) { 1540867868fbSNeilBrown if (d==0) 1541867868fbSNeilBrown d = conf->raid_disks; 1542867868fbSNeilBrown d--; 1543867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1544867868fbSNeilBrown if (rdev && 1545867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1546867868fbSNeilBrown if (sync_page_io(rdev->bdev, 1547867868fbSNeilBrown sect + rdev->data_offset, 1548867868fbSNeilBrown s<<9, conf->tmppage, WRITE) 1549867868fbSNeilBrown == 0) 1550867868fbSNeilBrown /* Well, this device is dead */ 1551867868fbSNeilBrown md_error(mddev, rdev); 1552867868fbSNeilBrown } 1553867868fbSNeilBrown } 1554867868fbSNeilBrown d = start; 1555867868fbSNeilBrown while (d != read_disk) { 1556867868fbSNeilBrown char b[BDEVNAME_SIZE]; 1557867868fbSNeilBrown if (d==0) 1558867868fbSNeilBrown d = conf->raid_disks; 1559867868fbSNeilBrown d--; 1560867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1561867868fbSNeilBrown if (rdev && 1562867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1563867868fbSNeilBrown if (sync_page_io(rdev->bdev, 1564867868fbSNeilBrown sect + rdev->data_offset, 1565867868fbSNeilBrown s<<9, conf->tmppage, READ) 1566867868fbSNeilBrown == 0) 1567867868fbSNeilBrown /* Well, this device is dead */ 1568867868fbSNeilBrown md_error(mddev, rdev); 1569867868fbSNeilBrown else { 1570867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 1571867868fbSNeilBrown printk(KERN_INFO 1572867868fbSNeilBrown "raid1:%s: read error corrected " 1573867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 1574867868fbSNeilBrown mdname(mddev), s, 1575969b755aSRandy Dunlap (unsigned long long)(sect + 1576969b755aSRandy Dunlap rdev->data_offset), 1577867868fbSNeilBrown bdevname(rdev->bdev, b)); 1578867868fbSNeilBrown } 1579867868fbSNeilBrown } 1580867868fbSNeilBrown } 1581867868fbSNeilBrown sectors -= s; 1582867868fbSNeilBrown sect += s; 1583867868fbSNeilBrown } 1584867868fbSNeilBrown } 1585867868fbSNeilBrown 15861da177e4SLinus Torvalds static void raid1d(mddev_t *mddev) 15871da177e4SLinus Torvalds { 15881da177e4SLinus Torvalds r1bio_t *r1_bio; 15891da177e4SLinus Torvalds struct bio *bio; 15901da177e4SLinus Torvalds unsigned long flags; 1591070ec55dSNeilBrown conf_t *conf = mddev->private; 15921da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 15931da177e4SLinus Torvalds int unplug=0; 15941da177e4SLinus Torvalds mdk_rdev_t *rdev; 15951da177e4SLinus Torvalds 15961da177e4SLinus Torvalds md_check_recovery(mddev); 15971da177e4SLinus Torvalds 15981da177e4SLinus Torvalds for (;;) { 15991da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1600a35e63efSNeilBrown 1601a35e63efSNeilBrown unplug += flush_pending_writes(conf); 1602a35e63efSNeilBrown 16031da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 1604a35e63efSNeilBrown if (list_empty(head)) { 1605191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16061da177e4SLinus Torvalds break; 1607a35e63efSNeilBrown } 16081da177e4SLinus Torvalds r1_bio = list_entry(head->prev, r1bio_t, retry_list); 16091da177e4SLinus Torvalds list_del(head->prev); 1610ddaf22abSNeilBrown conf->nr_queued--; 16111da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds mddev = r1_bio->mddev; 1614070ec55dSNeilBrown conf = mddev->private; 16151da177e4SLinus Torvalds if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 16161da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 16171da177e4SLinus Torvalds unplug = 1; 1618a9701a30SNeilBrown } else if (test_bit(R1BIO_BarrierRetry, &r1_bio->state)) { 1619a9701a30SNeilBrown /* some requests in the r1bio were BIO_RW_BARRIER 1620bea27718SNeilBrown * requests which failed with -EOPNOTSUPP. Hohumm.. 1621a9701a30SNeilBrown * Better resubmit without the barrier. 1622a9701a30SNeilBrown * We know which devices to resubmit for, because 1623a9701a30SNeilBrown * all others have had their bios[] entry cleared. 16245e7dd2abSNeilBrown * We already have a nr_pending reference on these rdevs. 1625a9701a30SNeilBrown */ 1626a9701a30SNeilBrown int i; 16271f98a13fSJens Axboe const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO); 1628a9701a30SNeilBrown clear_bit(R1BIO_BarrierRetry, &r1_bio->state); 1629a9701a30SNeilBrown clear_bit(R1BIO_Barrier, &r1_bio->state); 1630a9701a30SNeilBrown for (i=0; i < conf->raid_disks; i++) 16312f889129SNeilBrown if (r1_bio->bios[i]) 16322f889129SNeilBrown atomic_inc(&r1_bio->remaining); 16332f889129SNeilBrown for (i=0; i < conf->raid_disks; i++) 1634a9701a30SNeilBrown if (r1_bio->bios[i]) { 1635a9701a30SNeilBrown struct bio_vec *bvec; 1636a9701a30SNeilBrown int j; 1637a9701a30SNeilBrown 1638a9701a30SNeilBrown bio = bio_clone(r1_bio->master_bio, GFP_NOIO); 1639a9701a30SNeilBrown /* copy pages from the failed bio, as 1640a9701a30SNeilBrown * this might be a write-behind device */ 1641a9701a30SNeilBrown __bio_for_each_segment(bvec, bio, j, 0) 1642a9701a30SNeilBrown bvec->bv_page = bio_iovec_idx(r1_bio->bios[i], j)->bv_page; 1643a9701a30SNeilBrown bio_put(r1_bio->bios[i]); 1644a9701a30SNeilBrown bio->bi_sector = r1_bio->sector + 1645a9701a30SNeilBrown conf->mirrors[i].rdev->data_offset; 1646a9701a30SNeilBrown bio->bi_bdev = conf->mirrors[i].rdev->bdev; 1647a9701a30SNeilBrown bio->bi_end_io = raid1_end_write_request; 16481ef04fefSDmitry Monakhov bio->bi_rw = WRITE | 16491ef04fefSDmitry Monakhov (do_sync << BIO_RW_SYNCIO); 1650a9701a30SNeilBrown bio->bi_private = r1_bio; 1651a9701a30SNeilBrown r1_bio->bios[i] = bio; 1652a9701a30SNeilBrown generic_make_request(bio); 1653a9701a30SNeilBrown } 16541da177e4SLinus Torvalds } else { 16551da177e4SLinus Torvalds int disk; 1656ddaf22abSNeilBrown 1657ddaf22abSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 1658ddaf22abSNeilBrown * the block and we can fix it. 1659ddaf22abSNeilBrown * We freeze all other IO, and try reading the block from 1660ddaf22abSNeilBrown * other devices. When we find one, we re-write 1661ddaf22abSNeilBrown * and check it that fixes the read error. 1662ddaf22abSNeilBrown * This is all done synchronously while the array is 1663ddaf22abSNeilBrown * frozen 1664ddaf22abSNeilBrown */ 1665867868fbSNeilBrown if (mddev->ro == 0) { 1666ddaf22abSNeilBrown freeze_array(conf); 1667867868fbSNeilBrown fix_read_error(conf, r1_bio->read_disk, 1668867868fbSNeilBrown r1_bio->sector, 1669867868fbSNeilBrown r1_bio->sectors); 1670ddaf22abSNeilBrown unfreeze_array(conf); 1671d0e26078SNeilBrown } else 1672d0e26078SNeilBrown md_error(mddev, 1673d0e26078SNeilBrown conf->mirrors[r1_bio->read_disk].rdev); 1674ddaf22abSNeilBrown 16751da177e4SLinus Torvalds bio = r1_bio->bios[r1_bio->read_disk]; 1676d0e26078SNeilBrown if ((disk=read_balance(conf, r1_bio)) == -1) { 16771da177e4SLinus Torvalds printk(KERN_ALERT "raid1: %s: unrecoverable I/O" 16781da177e4SLinus Torvalds " read error for block %llu\n", 16791da177e4SLinus Torvalds bdevname(bio->bi_bdev,b), 16801da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 16811da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 16821da177e4SLinus Torvalds } else { 16831f98a13fSJens Axboe const bool do_sync = bio_rw_flagged(r1_bio->master_bio, BIO_RW_SYNCIO); 1684cf30a473SNeilBrown r1_bio->bios[r1_bio->read_disk] = 1685cf30a473SNeilBrown mddev->ro ? IO_BLOCKED : NULL; 16861da177e4SLinus Torvalds r1_bio->read_disk = disk; 16871da177e4SLinus Torvalds bio_put(bio); 16881da177e4SLinus Torvalds bio = bio_clone(r1_bio->master_bio, GFP_NOIO); 16891da177e4SLinus Torvalds r1_bio->bios[r1_bio->read_disk] = bio; 16901da177e4SLinus Torvalds rdev = conf->mirrors[disk].rdev; 16911da177e4SLinus Torvalds if (printk_ratelimit()) 16921da177e4SLinus Torvalds printk(KERN_ERR "raid1: %s: redirecting sector %llu to" 16931da177e4SLinus Torvalds " another mirror\n", 16941da177e4SLinus Torvalds bdevname(rdev->bdev,b), 16951da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 16961da177e4SLinus Torvalds bio->bi_sector = r1_bio->sector + rdev->data_offset; 16971da177e4SLinus Torvalds bio->bi_bdev = rdev->bdev; 16981da177e4SLinus Torvalds bio->bi_end_io = raid1_end_read_request; 16991ef04fefSDmitry Monakhov bio->bi_rw = READ | (do_sync << BIO_RW_SYNCIO); 17001da177e4SLinus Torvalds bio->bi_private = r1_bio; 17011da177e4SLinus Torvalds unplug = 1; 17021da177e4SLinus Torvalds generic_make_request(bio); 17031da177e4SLinus Torvalds } 17041da177e4SLinus Torvalds } 17051d9d5241SNeilBrown cond_resched(); 17061da177e4SLinus Torvalds } 17071da177e4SLinus Torvalds if (unplug) 17081da177e4SLinus Torvalds unplug_slaves(mddev); 17091da177e4SLinus Torvalds } 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds 17121da177e4SLinus Torvalds static int init_resync(conf_t *conf) 17131da177e4SLinus Torvalds { 17141da177e4SLinus Torvalds int buffs; 17151da177e4SLinus Torvalds 17161da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 17179e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 17181da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 17191da177e4SLinus Torvalds conf->poolinfo); 17201da177e4SLinus Torvalds if (!conf->r1buf_pool) 17211da177e4SLinus Torvalds return -ENOMEM; 17221da177e4SLinus Torvalds conf->next_resync = 0; 17231da177e4SLinus Torvalds return 0; 17241da177e4SLinus Torvalds } 17251da177e4SLinus Torvalds 17261da177e4SLinus Torvalds /* 17271da177e4SLinus Torvalds * perform a "sync" on one "block" 17281da177e4SLinus Torvalds * 17291da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 17301da177e4SLinus Torvalds * requests - conflict with active sync requests. 17311da177e4SLinus Torvalds * 17321da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 17331da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 17341da177e4SLinus Torvalds */ 17351da177e4SLinus Torvalds 173657afd89fSNeilBrown static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) 17371da177e4SLinus Torvalds { 1738070ec55dSNeilBrown conf_t *conf = mddev->private; 17391da177e4SLinus Torvalds r1bio_t *r1_bio; 17401da177e4SLinus Torvalds struct bio *bio; 17411da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 17423e198f78SNeilBrown int disk = -1; 17431da177e4SLinus Torvalds int i; 17443e198f78SNeilBrown int wonly = -1; 17453e198f78SNeilBrown int write_targets = 0, read_targets = 0; 1746191ea9b2SNeilBrown int sync_blocks; 1747e3b9703eSNeilBrown int still_degraded = 0; 17481da177e4SLinus Torvalds 17491da177e4SLinus Torvalds if (!conf->r1buf_pool) 1750191ea9b2SNeilBrown { 1751191ea9b2SNeilBrown /* 1752191ea9b2SNeilBrown printk("sync start - bitmap %p\n", mddev->bitmap); 1753191ea9b2SNeilBrown */ 17541da177e4SLinus Torvalds if (init_resync(conf)) 175557afd89fSNeilBrown return 0; 1756191ea9b2SNeilBrown } 17571da177e4SLinus Torvalds 175858c0fed4SAndre Noll max_sector = mddev->dev_sectors; 17591da177e4SLinus Torvalds if (sector_nr >= max_sector) { 1760191ea9b2SNeilBrown /* If we aborted, we need to abort the 1761191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 1762191ea9b2SNeilBrown * only be one in raid1 resync. 1763191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 1764191ea9b2SNeilBrown */ 17656a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 17666a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 1767191ea9b2SNeilBrown &sync_blocks, 1); 17686a806c51SNeilBrown else /* completed sync */ 1769191ea9b2SNeilBrown conf->fullsync = 0; 17706a806c51SNeilBrown 17716a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 17721da177e4SLinus Torvalds close_sync(conf); 17731da177e4SLinus Torvalds return 0; 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds 177607d84d10SNeilBrown if (mddev->bitmap == NULL && 177707d84d10SNeilBrown mddev->recovery_cp == MaxSector && 17786394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 177907d84d10SNeilBrown conf->fullsync == 0) { 178007d84d10SNeilBrown *skipped = 1; 178107d84d10SNeilBrown return max_sector - sector_nr; 178207d84d10SNeilBrown } 17836394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 17846394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 17856394cca5SNeilBrown */ 1786e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 1787e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 1788191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 1789191ea9b2SNeilBrown *skipped = 1; 1790191ea9b2SNeilBrown return sync_blocks; 1791191ea9b2SNeilBrown } 17921da177e4SLinus Torvalds /* 179317999be4SNeilBrown * If there is non-resync activity waiting for a turn, 179417999be4SNeilBrown * and resync is going fast enough, 179517999be4SNeilBrown * then let it though before starting on this new sync request. 17961da177e4SLinus Torvalds */ 179717999be4SNeilBrown if (!go_faster && conf->nr_waiting) 17981da177e4SLinus Torvalds msleep_interruptible(1000); 179917999be4SNeilBrown 1800b47490c9SNeilBrown bitmap_cond_end_sync(mddev->bitmap, sector_nr); 180117999be4SNeilBrown raise_barrier(conf); 180217999be4SNeilBrown 180317999be4SNeilBrown conf->next_resync = sector_nr; 18041da177e4SLinus Torvalds 18051da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 18063e198f78SNeilBrown rcu_read_lock(); 18073e198f78SNeilBrown /* 18083e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 18093e198f78SNeilBrown * we might want to read from a different device. So we 18103e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 18113e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 18123e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 18133e198f78SNeilBrown * is OK. 18143e198f78SNeilBrown */ 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds r1_bio->mddev = mddev; 18171da177e4SLinus Torvalds r1_bio->sector = sector_nr; 1818191ea9b2SNeilBrown r1_bio->state = 0; 18191da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 18201da177e4SLinus Torvalds 18211da177e4SLinus Torvalds for (i=0; i < conf->raid_disks; i++) { 18223e198f78SNeilBrown mdk_rdev_t *rdev; 18231da177e4SLinus Torvalds bio = r1_bio->bios[i]; 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds /* take from bio_init */ 18261da177e4SLinus Torvalds bio->bi_next = NULL; 18271da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 1828802ba064SNeilBrown bio->bi_rw = READ; 18291da177e4SLinus Torvalds bio->bi_vcnt = 0; 18301da177e4SLinus Torvalds bio->bi_idx = 0; 18311da177e4SLinus Torvalds bio->bi_phys_segments = 0; 18321da177e4SLinus Torvalds bio->bi_size = 0; 18331da177e4SLinus Torvalds bio->bi_end_io = NULL; 18341da177e4SLinus Torvalds bio->bi_private = NULL; 18351da177e4SLinus Torvalds 18363e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 18373e198f78SNeilBrown if (rdev == NULL || 18383e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 1839e3b9703eSNeilBrown still_degraded = 1; 1840e3b9703eSNeilBrown continue; 18413e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 18421da177e4SLinus Torvalds bio->bi_rw = WRITE; 18431da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 18441da177e4SLinus Torvalds write_targets ++; 18453e198f78SNeilBrown } else { 18463e198f78SNeilBrown /* may need to read from here */ 18473e198f78SNeilBrown bio->bi_rw = READ; 18483e198f78SNeilBrown bio->bi_end_io = end_sync_read; 18493e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 18503e198f78SNeilBrown if (wonly < 0) 18513e198f78SNeilBrown wonly = i; 18523e198f78SNeilBrown } else { 18533e198f78SNeilBrown if (disk < 0) 18543e198f78SNeilBrown disk = i; 18553e198f78SNeilBrown } 18563e198f78SNeilBrown read_targets++; 18573e198f78SNeilBrown } 18583e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 18593e198f78SNeilBrown bio->bi_sector = sector_nr + rdev->data_offset; 18603e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 18611da177e4SLinus Torvalds bio->bi_private = r1_bio; 18621da177e4SLinus Torvalds } 18633e198f78SNeilBrown rcu_read_unlock(); 18643e198f78SNeilBrown if (disk < 0) 18653e198f78SNeilBrown disk = wonly; 18663e198f78SNeilBrown r1_bio->read_disk = disk; 1867191ea9b2SNeilBrown 18683e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 18693e198f78SNeilBrown /* extra read targets are also write targets */ 18703e198f78SNeilBrown write_targets += read_targets-1; 18713e198f78SNeilBrown 18723e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 18731da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 18741da177e4SLinus Torvalds * drives must be failed - so we are finished 18751da177e4SLinus Torvalds */ 187657afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 187757afd89fSNeilBrown *skipped = 1; 18781da177e4SLinus Torvalds put_buf(r1_bio); 18791da177e4SLinus Torvalds return rv; 18801da177e4SLinus Torvalds } 18811da177e4SLinus Torvalds 1882c6207277SNeilBrown if (max_sector > mddev->resync_max) 1883c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 18841da177e4SLinus Torvalds nr_sectors = 0; 1885289e99e8SNeilBrown sync_blocks = 0; 18861da177e4SLinus Torvalds do { 18871da177e4SLinus Torvalds struct page *page; 18881da177e4SLinus Torvalds int len = PAGE_SIZE; 18891da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 18901da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 18911da177e4SLinus Torvalds if (len == 0) 18921da177e4SLinus Torvalds break; 1893ab7a30c7SNeilBrown if (sync_blocks == 0) { 18946a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 1895e3b9703eSNeilBrown &sync_blocks, still_degraded) && 1896e5de485fSNeilBrown !conf->fullsync && 1897e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 1898191ea9b2SNeilBrown break; 18999e77c485SEric Sesterhenn BUG_ON(sync_blocks < (PAGE_SIZE>>9)); 19006a806c51SNeilBrown if (len > (sync_blocks<<9)) 19016a806c51SNeilBrown len = sync_blocks<<9; 1902ab7a30c7SNeilBrown } 1903191ea9b2SNeilBrown 19041da177e4SLinus Torvalds for (i=0 ; i < conf->raid_disks; i++) { 19051da177e4SLinus Torvalds bio = r1_bio->bios[i]; 19061da177e4SLinus Torvalds if (bio->bi_end_io) { 1907d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 19081da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 19091da177e4SLinus Torvalds /* stop here */ 1910d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 19111da177e4SLinus Torvalds while (i > 0) { 19121da177e4SLinus Torvalds i--; 19131da177e4SLinus Torvalds bio = r1_bio->bios[i]; 19146a806c51SNeilBrown if (bio->bi_end_io==NULL) 19156a806c51SNeilBrown continue; 19161da177e4SLinus Torvalds /* remove last page from this bio */ 19171da177e4SLinus Torvalds bio->bi_vcnt--; 19181da177e4SLinus Torvalds bio->bi_size -= len; 19191da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 19201da177e4SLinus Torvalds } 19211da177e4SLinus Torvalds goto bio_full; 19221da177e4SLinus Torvalds } 19231da177e4SLinus Torvalds } 19241da177e4SLinus Torvalds } 19251da177e4SLinus Torvalds nr_sectors += len>>9; 19261da177e4SLinus Torvalds sector_nr += len>>9; 1927191ea9b2SNeilBrown sync_blocks -= (len>>9); 19281da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 19291da177e4SLinus Torvalds bio_full: 19301da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 19311da177e4SLinus Torvalds 1932d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 1933d11c171eSNeilBrown * compare 1934d11c171eSNeilBrown */ 1935d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 1936d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 1937d11c171eSNeilBrown for (i=0; i<conf->raid_disks; i++) { 1938d11c171eSNeilBrown bio = r1_bio->bios[i]; 1939d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 1940ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 19411da177e4SLinus Torvalds generic_make_request(bio); 1942d11c171eSNeilBrown } 1943d11c171eSNeilBrown } 1944d11c171eSNeilBrown } else { 1945d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 1946d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 1947ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 1948d11c171eSNeilBrown generic_make_request(bio); 1949d11c171eSNeilBrown 1950d11c171eSNeilBrown } 19511da177e4SLinus Torvalds return nr_sectors; 19521da177e4SLinus Torvalds } 19531da177e4SLinus Torvalds 195480c3a6ceSDan Williams static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) 195580c3a6ceSDan Williams { 195680c3a6ceSDan Williams if (sectors) 195780c3a6ceSDan Williams return sectors; 195880c3a6ceSDan Williams 195980c3a6ceSDan Williams return mddev->dev_sectors; 196080c3a6ceSDan Williams } 196180c3a6ceSDan Williams 1962709ae487SNeilBrown static conf_t *setup_conf(mddev_t *mddev) 19631da177e4SLinus Torvalds { 19641da177e4SLinus Torvalds conf_t *conf; 1965709ae487SNeilBrown int i; 19661da177e4SLinus Torvalds mirror_info_t *disk; 19671da177e4SLinus Torvalds mdk_rdev_t *rdev; 1968709ae487SNeilBrown int err = -ENOMEM; 19691da177e4SLinus Torvalds 19709ffae0cfSNeilBrown conf = kzalloc(sizeof(conf_t), GFP_KERNEL); 19711da177e4SLinus Torvalds if (!conf) 1972709ae487SNeilBrown goto abort; 19731da177e4SLinus Torvalds 19749ffae0cfSNeilBrown conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, 19751da177e4SLinus Torvalds GFP_KERNEL); 19761da177e4SLinus Torvalds if (!conf->mirrors) 1977709ae487SNeilBrown goto abort; 19781da177e4SLinus Torvalds 1979ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 1980ddaf22abSNeilBrown if (!conf->tmppage) 1981709ae487SNeilBrown goto abort; 1982ddaf22abSNeilBrown 1983709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 19841da177e4SLinus Torvalds if (!conf->poolinfo) 1985709ae487SNeilBrown goto abort; 19861da177e4SLinus Torvalds conf->poolinfo->raid_disks = mddev->raid_disks; 19871da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 19881da177e4SLinus Torvalds r1bio_pool_free, 19891da177e4SLinus Torvalds conf->poolinfo); 19901da177e4SLinus Torvalds if (!conf->r1bio_pool) 1991709ae487SNeilBrown goto abort; 1992709ae487SNeilBrown 1993ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 19941da177e4SLinus Torvalds 1995e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 1996159ec1fcSCheng Renquan list_for_each_entry(rdev, &mddev->disks, same_set) { 1997709ae487SNeilBrown int disk_idx = rdev->raid_disk; 19981da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 19991da177e4SLinus Torvalds || disk_idx < 0) 20001da177e4SLinus Torvalds continue; 20011da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 20021da177e4SLinus Torvalds 20031da177e4SLinus Torvalds disk->rdev = rdev; 20041da177e4SLinus Torvalds 20051da177e4SLinus Torvalds disk->head_position = 0; 20061da177e4SLinus Torvalds } 20071da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 20081da177e4SLinus Torvalds conf->mddev = mddev; 20091da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 20101da177e4SLinus Torvalds 20111da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 201217999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 20131da177e4SLinus Torvalds 2014191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 2015191ea9b2SNeilBrown bio_list_init(&conf->flushing_bio_list); 2016191ea9b2SNeilBrown 2017709ae487SNeilBrown conf->last_used = -1; 20181da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 20191da177e4SLinus Torvalds 20201da177e4SLinus Torvalds disk = conf->mirrors + i; 20211da177e4SLinus Torvalds 20225fd6c1dcSNeilBrown if (!disk->rdev || 20235fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 20241da177e4SLinus Torvalds disk->head_position = 0; 2025918f0238SNeilBrown if (disk->rdev) 202617571284SNeilBrown conf->fullsync = 1; 2027709ae487SNeilBrown } else if (conf->last_used < 0) 2028709ae487SNeilBrown /* 2029709ae487SNeilBrown * The first working device is used as a 2030709ae487SNeilBrown * starting point to read balancing. 2031709ae487SNeilBrown */ 2032709ae487SNeilBrown conf->last_used = i; 20331da177e4SLinus Torvalds } 2034709ae487SNeilBrown 2035709ae487SNeilBrown err = -EIO; 2036709ae487SNeilBrown if (conf->last_used < 0) { 203711ce99e6SNeilBrown printk(KERN_ERR "raid1: no operational mirrors for %s\n", 203811ce99e6SNeilBrown mdname(mddev)); 2039709ae487SNeilBrown goto abort; 204011ce99e6SNeilBrown } 2041709ae487SNeilBrown err = -ENOMEM; 2042709ae487SNeilBrown conf->thread = md_register_thread(raid1d, mddev, NULL); 2043709ae487SNeilBrown if (!conf->thread) { 20441da177e4SLinus Torvalds printk(KERN_ERR 20451da177e4SLinus Torvalds "raid1: couldn't allocate thread for %s\n", 20461da177e4SLinus Torvalds mdname(mddev)); 2047709ae487SNeilBrown goto abort; 20481da177e4SLinus Torvalds } 2049191ea9b2SNeilBrown 2050709ae487SNeilBrown return conf; 2051709ae487SNeilBrown 2052709ae487SNeilBrown abort: 2053709ae487SNeilBrown if (conf) { 2054709ae487SNeilBrown if (conf->r1bio_pool) 2055709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2056709ae487SNeilBrown kfree(conf->mirrors); 2057709ae487SNeilBrown safe_put_page(conf->tmppage); 2058709ae487SNeilBrown kfree(conf->poolinfo); 2059709ae487SNeilBrown kfree(conf); 2060709ae487SNeilBrown } 2061709ae487SNeilBrown return ERR_PTR(err); 2062709ae487SNeilBrown } 2063709ae487SNeilBrown 2064709ae487SNeilBrown static int run(mddev_t *mddev) 2065709ae487SNeilBrown { 2066709ae487SNeilBrown conf_t *conf; 2067709ae487SNeilBrown int i; 2068709ae487SNeilBrown mdk_rdev_t *rdev; 2069709ae487SNeilBrown 2070709ae487SNeilBrown if (mddev->level != 1) { 2071709ae487SNeilBrown printk("raid1: %s: raid level not set to mirroring (%d)\n", 2072709ae487SNeilBrown mdname(mddev), mddev->level); 2073709ae487SNeilBrown return -EIO; 2074709ae487SNeilBrown } 2075709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 2076709ae487SNeilBrown printk("raid1: %s: reshape_position set but not supported\n", 2077709ae487SNeilBrown mdname(mddev)); 2078709ae487SNeilBrown return -EIO; 2079709ae487SNeilBrown } 2080709ae487SNeilBrown /* 2081709ae487SNeilBrown * copy the already verified devices into our private RAID1 2082709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2083709ae487SNeilBrown * should be freed in stop()] 2084709ae487SNeilBrown */ 2085709ae487SNeilBrown if (mddev->private == NULL) 2086709ae487SNeilBrown conf = setup_conf(mddev); 2087709ae487SNeilBrown else 2088709ae487SNeilBrown conf = mddev->private; 2089709ae487SNeilBrown 2090709ae487SNeilBrown if (IS_ERR(conf)) 2091709ae487SNeilBrown return PTR_ERR(conf); 2092709ae487SNeilBrown 2093709ae487SNeilBrown mddev->queue->queue_lock = &conf->device_lock; 2094709ae487SNeilBrown list_for_each_entry(rdev, &mddev->disks, same_set) { 2095709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2096709ae487SNeilBrown rdev->data_offset << 9); 2097709ae487SNeilBrown /* as we don't honour merge_bvec_fn, we must never risk 2098627a2d3cSNeilBrown * violating it, so limit ->max_segments to 1 lying within 2099627a2d3cSNeilBrown * a single page, as a one page request is never in violation. 2100709ae487SNeilBrown */ 2101627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 2102627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 2103627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 2104627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 2105627a2d3cSNeilBrown } 2106709ae487SNeilBrown } 2107709ae487SNeilBrown 2108709ae487SNeilBrown mddev->degraded = 0; 2109709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2110709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2111709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2112709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2113709ae487SNeilBrown mddev->degraded++; 2114709ae487SNeilBrown 2115709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2116709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2117709ae487SNeilBrown 21188c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 21198c6ac868SAndre Noll printk(KERN_NOTICE "raid1: %s is not clean" 21208c6ac868SAndre Noll " -- starting background reconstruction\n", 21218c6ac868SAndre Noll mdname(mddev)); 21221da177e4SLinus Torvalds printk(KERN_INFO 21231da177e4SLinus Torvalds "raid1: raid set %s active with %d out of %d mirrors\n", 21241da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 21251da177e4SLinus Torvalds mddev->raid_disks); 2126709ae487SNeilBrown 21271da177e4SLinus Torvalds /* 21281da177e4SLinus Torvalds * Ok, everything is just fine now 21291da177e4SLinus Torvalds */ 2130709ae487SNeilBrown mddev->thread = conf->thread; 2131709ae487SNeilBrown conf->thread = NULL; 2132709ae487SNeilBrown mddev->private = conf; 2133709ae487SNeilBrown 21341f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 21351da177e4SLinus Torvalds 21367a5febe9SNeilBrown mddev->queue->unplug_fn = raid1_unplug; 21370d129228SNeilBrown mddev->queue->backing_dev_info.congested_fn = raid1_congested; 21380d129228SNeilBrown mddev->queue->backing_dev_info.congested_data = mddev; 2139ac5e7113SAndre Noll md_integrity_register(mddev); 21401da177e4SLinus Torvalds return 0; 21411da177e4SLinus Torvalds } 21421da177e4SLinus Torvalds 21431da177e4SLinus Torvalds static int stop(mddev_t *mddev) 21441da177e4SLinus Torvalds { 2145070ec55dSNeilBrown conf_t *conf = mddev->private; 21464b6d287fSNeilBrown struct bitmap *bitmap = mddev->bitmap; 21474b6d287fSNeilBrown int behind_wait = 0; 21484b6d287fSNeilBrown 21494b6d287fSNeilBrown /* wait for behind writes to complete */ 21504b6d287fSNeilBrown while (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 21514b6d287fSNeilBrown behind_wait++; 21524b6d287fSNeilBrown printk(KERN_INFO "raid1: behind writes in progress on device %s, waiting to stop (%d)\n", mdname(mddev), behind_wait); 21534b6d287fSNeilBrown set_current_state(TASK_UNINTERRUPTIBLE); 21544b6d287fSNeilBrown schedule_timeout(HZ); /* wait a second */ 21554b6d287fSNeilBrown /* need to kick something here to make sure I/O goes? */ 21564b6d287fSNeilBrown } 21571da177e4SLinus Torvalds 2158409c57f3SNeilBrown raise_barrier(conf); 2159409c57f3SNeilBrown lower_barrier(conf); 2160409c57f3SNeilBrown 21611da177e4SLinus Torvalds md_unregister_thread(mddev->thread); 21621da177e4SLinus Torvalds mddev->thread = NULL; 21631da177e4SLinus Torvalds blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ 21641da177e4SLinus Torvalds if (conf->r1bio_pool) 21651da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 21661da177e4SLinus Torvalds kfree(conf->mirrors); 21671da177e4SLinus Torvalds kfree(conf->poolinfo); 21681da177e4SLinus Torvalds kfree(conf); 21691da177e4SLinus Torvalds mddev->private = NULL; 21701da177e4SLinus Torvalds return 0; 21711da177e4SLinus Torvalds } 21721da177e4SLinus Torvalds 21731da177e4SLinus Torvalds static int raid1_resize(mddev_t *mddev, sector_t sectors) 21741da177e4SLinus Torvalds { 21751da177e4SLinus Torvalds /* no resync is happening, and there is enough space 21761da177e4SLinus Torvalds * on all devices, so we can resize. 21771da177e4SLinus Torvalds * We need to make sure resync covers any new space. 21781da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 21791da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 21801da177e4SLinus Torvalds * worth it. 21811da177e4SLinus Torvalds */ 21821f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); 2183b522adcdSDan Williams if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) 2184b522adcdSDan Williams return -EINVAL; 2185f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 2186449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 2187b522adcdSDan Williams if (sectors > mddev->dev_sectors && 2188f233ea5cSAndre Noll mddev->recovery_cp == MaxSector) { 218958c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 21901da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 21911da177e4SLinus Torvalds } 2192b522adcdSDan Williams mddev->dev_sectors = sectors; 21934b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 21941da177e4SLinus Torvalds return 0; 21951da177e4SLinus Torvalds } 21961da177e4SLinus Torvalds 219763c70c4fSNeilBrown static int raid1_reshape(mddev_t *mddev) 21981da177e4SLinus Torvalds { 21991da177e4SLinus Torvalds /* We need to: 22001da177e4SLinus Torvalds * 1/ resize the r1bio_pool 22011da177e4SLinus Torvalds * 2/ resize conf->mirrors 22021da177e4SLinus Torvalds * 22031da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 22041da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 22051da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 22066ea9c07cSNeilBrown * 22076ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 22086ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 22091da177e4SLinus Torvalds */ 22101da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 22111da177e4SLinus Torvalds struct pool_info *newpoolinfo; 22121da177e4SLinus Torvalds mirror_info_t *newmirrors; 2213070ec55dSNeilBrown conf_t *conf = mddev->private; 221463c70c4fSNeilBrown int cnt, raid_disks; 2215c04be0aaSNeilBrown unsigned long flags; 2216b5470dc5SDan Williams int d, d2, err; 22171da177e4SLinus Torvalds 221863c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 2219664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 222063c70c4fSNeilBrown mddev->layout != mddev->new_layout || 222163c70c4fSNeilBrown mddev->level != mddev->new_level) { 2222664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 222363c70c4fSNeilBrown mddev->new_layout = mddev->layout; 222463c70c4fSNeilBrown mddev->new_level = mddev->level; 222563c70c4fSNeilBrown return -EINVAL; 222663c70c4fSNeilBrown } 222763c70c4fSNeilBrown 2228b5470dc5SDan Williams err = md_allow_write(mddev); 2229b5470dc5SDan Williams if (err) 2230b5470dc5SDan Williams return err; 22312a2275d6SNeilBrown 223263c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 223363c70c4fSNeilBrown 22346ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 22356ea9c07cSNeilBrown cnt=0; 22366ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 22371da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 22386ea9c07cSNeilBrown cnt++; 22396ea9c07cSNeilBrown if (cnt > raid_disks) 22401da177e4SLinus Torvalds return -EBUSY; 22416ea9c07cSNeilBrown } 22421da177e4SLinus Torvalds 22431da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 22441da177e4SLinus Torvalds if (!newpoolinfo) 22451da177e4SLinus Torvalds return -ENOMEM; 22461da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 22471da177e4SLinus Torvalds newpoolinfo->raid_disks = raid_disks; 22481da177e4SLinus Torvalds 22491da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 22501da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 22511da177e4SLinus Torvalds if (!newpool) { 22521da177e4SLinus Torvalds kfree(newpoolinfo); 22531da177e4SLinus Torvalds return -ENOMEM; 22541da177e4SLinus Torvalds } 22559ffae0cfSNeilBrown newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); 22561da177e4SLinus Torvalds if (!newmirrors) { 22571da177e4SLinus Torvalds kfree(newpoolinfo); 22581da177e4SLinus Torvalds mempool_destroy(newpool); 22591da177e4SLinus Torvalds return -ENOMEM; 22601da177e4SLinus Torvalds } 22611da177e4SLinus Torvalds 226217999be4SNeilBrown raise_barrier(conf); 22631da177e4SLinus Torvalds 22641da177e4SLinus Torvalds /* ok, everything is stopped */ 22651da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 22661da177e4SLinus Torvalds conf->r1bio_pool = newpool; 22676ea9c07cSNeilBrown 2268a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 2269a88aa786SNeilBrown mdk_rdev_t *rdev = conf->mirrors[d].rdev; 2270a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 2271a88aa786SNeilBrown char nm[20]; 2272a88aa786SNeilBrown sprintf(nm, "rd%d", rdev->raid_disk); 2273a88aa786SNeilBrown sysfs_remove_link(&mddev->kobj, nm); 2274a88aa786SNeilBrown rdev->raid_disk = d2; 2275a88aa786SNeilBrown sprintf(nm, "rd%d", rdev->raid_disk); 2276a88aa786SNeilBrown sysfs_remove_link(&mddev->kobj, nm); 2277a88aa786SNeilBrown if (sysfs_create_link(&mddev->kobj, 2278a88aa786SNeilBrown &rdev->kobj, nm)) 2279a88aa786SNeilBrown printk(KERN_WARNING 2280a88aa786SNeilBrown "md/raid1: cannot register " 2281a88aa786SNeilBrown "%s for %s\n", 2282a88aa786SNeilBrown nm, mdname(mddev)); 2283a88aa786SNeilBrown } 2284a88aa786SNeilBrown if (rdev) 2285a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 22866ea9c07cSNeilBrown } 22871da177e4SLinus Torvalds kfree(conf->mirrors); 22881da177e4SLinus Torvalds conf->mirrors = newmirrors; 22891da177e4SLinus Torvalds kfree(conf->poolinfo); 22901da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 22911da177e4SLinus Torvalds 2292c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 22931da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 2294c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 22951da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 229663c70c4fSNeilBrown mddev->delta_disks = 0; 22971da177e4SLinus Torvalds 22986ea9c07cSNeilBrown conf->last_used = 0; /* just make sure it is in-range */ 229917999be4SNeilBrown lower_barrier(conf); 23001da177e4SLinus Torvalds 23011da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 23021da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 23031da177e4SLinus Torvalds 23041da177e4SLinus Torvalds mempool_destroy(oldpool); 23051da177e4SLinus Torvalds return 0; 23061da177e4SLinus Torvalds } 23071da177e4SLinus Torvalds 2308500af87aSNeilBrown static void raid1_quiesce(mddev_t *mddev, int state) 230936fa3063SNeilBrown { 2310070ec55dSNeilBrown conf_t *conf = mddev->private; 231136fa3063SNeilBrown 231236fa3063SNeilBrown switch(state) { 23136eef4b21SNeilBrown case 2: /* wake for suspend */ 23146eef4b21SNeilBrown wake_up(&conf->wait_barrier); 23156eef4b21SNeilBrown break; 23169e6603daSNeilBrown case 1: 231717999be4SNeilBrown raise_barrier(conf); 231836fa3063SNeilBrown break; 23199e6603daSNeilBrown case 0: 232017999be4SNeilBrown lower_barrier(conf); 232136fa3063SNeilBrown break; 232236fa3063SNeilBrown } 232336fa3063SNeilBrown } 232436fa3063SNeilBrown 2325709ae487SNeilBrown static void *raid1_takeover(mddev_t *mddev) 2326709ae487SNeilBrown { 2327709ae487SNeilBrown /* raid1 can take over: 2328709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 2329709ae487SNeilBrown */ 2330709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 2331709ae487SNeilBrown conf_t *conf; 2332709ae487SNeilBrown mddev->new_level = 1; 2333709ae487SNeilBrown mddev->new_layout = 0; 2334709ae487SNeilBrown mddev->new_chunk_sectors = 0; 2335709ae487SNeilBrown conf = setup_conf(mddev); 2336709ae487SNeilBrown if (!IS_ERR(conf)) 2337709ae487SNeilBrown conf->barrier = 1; 2338709ae487SNeilBrown return conf; 2339709ae487SNeilBrown } 2340709ae487SNeilBrown return ERR_PTR(-EINVAL); 2341709ae487SNeilBrown } 23421da177e4SLinus Torvalds 23432604b703SNeilBrown static struct mdk_personality raid1_personality = 23441da177e4SLinus Torvalds { 23451da177e4SLinus Torvalds .name = "raid1", 23462604b703SNeilBrown .level = 1, 23471da177e4SLinus Torvalds .owner = THIS_MODULE, 23481da177e4SLinus Torvalds .make_request = make_request, 23491da177e4SLinus Torvalds .run = run, 23501da177e4SLinus Torvalds .stop = stop, 23511da177e4SLinus Torvalds .status = status, 23521da177e4SLinus Torvalds .error_handler = error, 23531da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 23541da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 23551da177e4SLinus Torvalds .spare_active = raid1_spare_active, 23561da177e4SLinus Torvalds .sync_request = sync_request, 23571da177e4SLinus Torvalds .resize = raid1_resize, 235880c3a6ceSDan Williams .size = raid1_size, 235963c70c4fSNeilBrown .check_reshape = raid1_reshape, 236036fa3063SNeilBrown .quiesce = raid1_quiesce, 2361709ae487SNeilBrown .takeover = raid1_takeover, 23621da177e4SLinus Torvalds }; 23631da177e4SLinus Torvalds 23641da177e4SLinus Torvalds static int __init raid_init(void) 23651da177e4SLinus Torvalds { 23662604b703SNeilBrown return register_md_personality(&raid1_personality); 23671da177e4SLinus Torvalds } 23681da177e4SLinus Torvalds 23691da177e4SLinus Torvalds static void raid_exit(void) 23701da177e4SLinus Torvalds { 23712604b703SNeilBrown unregister_md_personality(&raid1_personality); 23721da177e4SLinus Torvalds } 23731da177e4SLinus Torvalds 23741da177e4SLinus Torvalds module_init(raid_init); 23751da177e4SLinus Torvalds module_exit(raid_exit); 23761da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 23770efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 23781da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 2379d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 23802604b703SNeilBrown MODULE_ALIAS("md-level-1"); 2381