11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * RAID-1 management functions. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 111da177e4SLinus Torvalds * 1296de0e25SJan Engelhardt * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> 131da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> 141da177e4SLinus Torvalds * 15191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support 16191ea9b2SNeilBrown * bitmapped intelligence in resync: 17191ea9b2SNeilBrown * 18191ea9b2SNeilBrown * - bitmap marked during normal i/o 19191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync 20191ea9b2SNeilBrown * 21191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: 22191ea9b2SNeilBrown * - persistent bitmap code 23191ea9b2SNeilBrown * 241da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 251da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 261da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 271da177e4SLinus Torvalds * any later version. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 301da177e4SLinus Torvalds * (for example /usr/src/linux/COPYING); if not, write to the Free 311da177e4SLinus Torvalds * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 345a0e3ad6STejun Heo #include <linux/slab.h> 3525570727SStephen Rothwell #include <linux/delay.h> 36bff61975SNeilBrown #include <linux/blkdev.h> 37bff61975SNeilBrown #include <linux/seq_file.h> 388bda470eSChristian Dietrich #include <linux/ratelimit.h> 3943b2e5d8SNeilBrown #include "md.h" 40ef740c37SChristoph Hellwig #include "raid1.h" 41ef740c37SChristoph Hellwig #include "bitmap.h" 42191ea9b2SNeilBrown 43191ea9b2SNeilBrown #define DEBUG 0 44d2eb35acSNeilBrown #define PRINTK(x...) do { if (DEBUG) printk(x); } while (0) 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 481da177e4SLinus Torvalds */ 491da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds 5217999be4SNeilBrown static void allow_barrier(conf_t *conf); 5317999be4SNeilBrown static void lower_barrier(conf_t *conf); 541da177e4SLinus Torvalds 55dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds struct pool_info *pi = data; 581da177e4SLinus Torvalds int size = offsetof(r1bio_t, bios[pi->raid_disks]); 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 617eaceaccSJens Axboe return kzalloc(size, gfp_flags); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 651da177e4SLinus Torvalds { 661da177e4SLinus Torvalds kfree(r1_bio); 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 701da177e4SLinus Torvalds //#define RESYNC_BLOCK_SIZE PAGE_SIZE 711da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 721da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 731da177e4SLinus Torvalds #define RESYNC_WINDOW (2048*1024) 741da177e4SLinus Torvalds 75dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 761da177e4SLinus Torvalds { 771da177e4SLinus Torvalds struct pool_info *pi = data; 781da177e4SLinus Torvalds struct page *page; 791da177e4SLinus Torvalds r1bio_t *r1_bio; 801da177e4SLinus Torvalds struct bio *bio; 811da177e4SLinus Torvalds int i, j; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 847eaceaccSJens Axboe if (!r1_bio) 851da177e4SLinus Torvalds return NULL; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* 881da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 891da177e4SLinus Torvalds */ 901da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 916746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 921da177e4SLinus Torvalds if (!bio) 931da177e4SLinus Torvalds goto out_free_bio; 941da177e4SLinus Torvalds r1_bio->bios[j] = bio; 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds /* 971da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 98d11c171eSNeilBrown * the first bio. 99d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 100d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1011da177e4SLinus Torvalds */ 102d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 103d11c171eSNeilBrown j = pi->raid_disks; 104d11c171eSNeilBrown else 105d11c171eSNeilBrown j = 1; 106d11c171eSNeilBrown while(j--) { 107d11c171eSNeilBrown bio = r1_bio->bios[j]; 1081da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1091da177e4SLinus Torvalds page = alloc_page(gfp_flags); 1101da177e4SLinus Torvalds if (unlikely(!page)) 1111da177e4SLinus Torvalds goto out_free_pages; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = page; 114303a0e11SNeilBrown bio->bi_vcnt = i+1; 1151da177e4SLinus Torvalds } 116d11c171eSNeilBrown } 117d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 118d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 119d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 120d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 121d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 122d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 123d11c171eSNeilBrown } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds return r1_bio; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds out_free_pages: 130d11c171eSNeilBrown for (j=0 ; j < pi->raid_disks; j++) 131303a0e11SNeilBrown for (i=0; i < r1_bio->bios[j]->bi_vcnt ; i++) 132303a0e11SNeilBrown put_page(r1_bio->bios[j]->bi_io_vec[i].bv_page); 133d11c171eSNeilBrown j = -1; 1341da177e4SLinus Torvalds out_free_bio: 1351da177e4SLinus Torvalds while ( ++j < pi->raid_disks ) 1361da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1371da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1381da177e4SLinus Torvalds return NULL; 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1421da177e4SLinus Torvalds { 1431da177e4SLinus Torvalds struct pool_info *pi = data; 144d11c171eSNeilBrown int i,j; 1451da177e4SLinus Torvalds r1bio_t *r1bio = __r1_bio; 1461da177e4SLinus Torvalds 147d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 148d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 149d11c171eSNeilBrown if (j == 0 || 150d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 151d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1521345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1551da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds int i; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 1651da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1664367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1671da177e4SLinus Torvalds bio_put(*bio); 1681da177e4SLinus Torvalds *bio = NULL; 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds 172858119e1SArjan van de Ven static void free_r1bio(r1bio_t *r1_bio) 1731da177e4SLinus Torvalds { 174070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1771da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1781da177e4SLinus Torvalds } 1791da177e4SLinus Torvalds 180858119e1SArjan van de Ven static void put_buf(r1bio_t *r1_bio) 1811da177e4SLinus Torvalds { 182070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 1833e198f78SNeilBrown int i; 1843e198f78SNeilBrown 1853e198f78SNeilBrown for (i=0; i<conf->raid_disks; i++) { 1863e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 1873e198f78SNeilBrown if (bio->bi_end_io) 1883e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 1893e198f78SNeilBrown } 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 1921da177e4SLinus Torvalds 19317999be4SNeilBrown lower_barrier(conf); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static void reschedule_retry(r1bio_t *r1_bio) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds unsigned long flags; 1991da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 200070ec55dSNeilBrown conf_t *conf = mddev->private; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2031da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 204ddaf22abSNeilBrown conf->nr_queued ++; 2051da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2061da177e4SLinus Torvalds 20717999be4SNeilBrown wake_up(&conf->wait_barrier); 2081da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds /* 2121da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2131da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2141da177e4SLinus Torvalds * cache layer. 2151da177e4SLinus Torvalds */ 216d2eb35acSNeilBrown static void call_bio_endio(r1bio_t *r1_bio) 217d2eb35acSNeilBrown { 218d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 219d2eb35acSNeilBrown int done; 220d2eb35acSNeilBrown conf_t *conf = r1_bio->mddev->private; 221d2eb35acSNeilBrown 222d2eb35acSNeilBrown if (bio->bi_phys_segments) { 223d2eb35acSNeilBrown unsigned long flags; 224d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 225d2eb35acSNeilBrown bio->bi_phys_segments--; 226d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 227d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 228d2eb35acSNeilBrown } else 229d2eb35acSNeilBrown done = 1; 230d2eb35acSNeilBrown 231d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 232d2eb35acSNeilBrown clear_bit(BIO_UPTODATE, &bio->bi_flags); 233d2eb35acSNeilBrown if (done) { 234d2eb35acSNeilBrown bio_endio(bio, 0); 235d2eb35acSNeilBrown /* 236d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 237d2eb35acSNeilBrown * to go idle. 238d2eb35acSNeilBrown */ 239d2eb35acSNeilBrown allow_barrier(conf); 240d2eb35acSNeilBrown } 241d2eb35acSNeilBrown } 242d2eb35acSNeilBrown 2431da177e4SLinus Torvalds static void raid_end_bio_io(r1bio_t *r1_bio) 2441da177e4SLinus Torvalds { 2451da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2461da177e4SLinus Torvalds 2474b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2484b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 2494b6d287fSNeilBrown PRINTK(KERN_DEBUG "raid1: sync end %s on sectors %llu-%llu\n", 2504b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2514b6d287fSNeilBrown (unsigned long long) bio->bi_sector, 2524b6d287fSNeilBrown (unsigned long long) bio->bi_sector + 2534b6d287fSNeilBrown (bio->bi_size >> 9) - 1); 2544b6d287fSNeilBrown 255d2eb35acSNeilBrown call_bio_endio(r1_bio); 2564b6d287fSNeilBrown } 2571da177e4SLinus Torvalds free_r1bio(r1_bio); 2581da177e4SLinus Torvalds } 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds /* 2611da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2621da177e4SLinus Torvalds */ 2631da177e4SLinus Torvalds static inline void update_head_pos(int disk, r1bio_t *r1_bio) 2641da177e4SLinus Torvalds { 265070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2681da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds 2716712ecf8SNeilBrown static void raid1_end_read_request(struct bio *bio, int error) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2747b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 2751da177e4SLinus Torvalds int mirror; 276070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds mirror = r1_bio->read_disk; 2791da177e4SLinus Torvalds /* 2801da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 2811da177e4SLinus Torvalds */ 282ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 283ddaf22abSNeilBrown 284220946c9SNeilBrown if (uptodate) 2851da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 286dd00a99eSNeilBrown else { 287dd00a99eSNeilBrown /* If all other devices have failed, we want to return 288dd00a99eSNeilBrown * the error upwards rather than fail the last device. 289dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 290dd00a99eSNeilBrown */ 291dd00a99eSNeilBrown unsigned long flags; 292dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 293dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 294dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 295dd00a99eSNeilBrown !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags))) 296dd00a99eSNeilBrown uptodate = 1; 297dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 298dd00a99eSNeilBrown } 2991da177e4SLinus Torvalds 300dd00a99eSNeilBrown if (uptodate) 3011da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 302dd00a99eSNeilBrown else { 3031da177e4SLinus Torvalds /* 3041da177e4SLinus Torvalds * oops, read error: 3051da177e4SLinus Torvalds */ 3061da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3078bda470eSChristian Dietrich printk_ratelimited( 3088bda470eSChristian Dietrich KERN_ERR "md/raid1:%s: %s: " 3098bda470eSChristian Dietrich "rescheduling sector %llu\n", 3109dd1e2faSNeilBrown mdname(conf->mddev), 3118bda470eSChristian Dietrich bdevname(conf->mirrors[mirror].rdev->bdev, 3128bda470eSChristian Dietrich b), 3138bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 314d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3151da177e4SLinus Torvalds reschedule_retry(r1_bio); 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 321cd5ff9a1SNeilBrown static void close_write(r1bio_t *r1_bio) 3224e78064fSNeilBrown { 3234e78064fSNeilBrown /* it really is the end of this request */ 3244e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3254e78064fSNeilBrown /* free extra copy of the data pages */ 326af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3274e78064fSNeilBrown while (i--) 3282ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3292ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3302ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3314e78064fSNeilBrown } 3324e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3334e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3344e78064fSNeilBrown r1_bio->sectors, 3354e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 336af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3374e78064fSNeilBrown md_write_end(r1_bio->mddev); 338cd5ff9a1SNeilBrown } 339cd5ff9a1SNeilBrown 340cd5ff9a1SNeilBrown static void r1_bio_write_done(r1bio_t *r1_bio) 341cd5ff9a1SNeilBrown { 342cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 343cd5ff9a1SNeilBrown return; 344cd5ff9a1SNeilBrown 345cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 346cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 347cd5ff9a1SNeilBrown else { 348cd5ff9a1SNeilBrown close_write(r1_bio); 3494367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3504367af55SNeilBrown reschedule_retry(r1_bio); 3514367af55SNeilBrown else 3524e78064fSNeilBrown raid_end_bio_io(r1_bio); 3534e78064fSNeilBrown } 3544e78064fSNeilBrown } 3554e78064fSNeilBrown 3566712ecf8SNeilBrown static void raid1_end_write_request(struct bio *bio, int error) 3571da177e4SLinus Torvalds { 3581da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 3597b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 360a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 361070ec55dSNeilBrown conf_t *conf = r1_bio->mddev->private; 36204b857f7SNeilBrown struct bio *to_put = NULL; 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds for (mirror = 0; mirror < conf->raid_disks; mirror++) 3661da177e4SLinus Torvalds if (r1_bio->bios[mirror] == bio) 3671da177e4SLinus Torvalds break; 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* 370e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 3711da177e4SLinus Torvalds */ 372191ea9b2SNeilBrown if (!uptodate) { 373cd5ff9a1SNeilBrown set_bit(WriteErrorSeen, 374cd5ff9a1SNeilBrown &conf->mirrors[mirror].rdev->flags); 375cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 3764367af55SNeilBrown } else { 3771da177e4SLinus Torvalds /* 378e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 379e9c7469bSTejun Heo * will return a good error code for to the higher 380e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 381e9c7469bSTejun Heo * fails. 3821da177e4SLinus Torvalds * 383e9c7469bSTejun Heo * The 'master' represents the composite IO operation 384e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 385e9c7469bSTejun Heo * will wait for the 'master' bio. 3861da177e4SLinus Torvalds */ 3874367af55SNeilBrown sector_t first_bad; 3884367af55SNeilBrown int bad_sectors; 3894367af55SNeilBrown 390cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 391cd5ff9a1SNeilBrown to_put = bio; 3921da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3931da177e4SLinus Torvalds 3944367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 3954367af55SNeilBrown if (is_badblock(conf->mirrors[mirror].rdev, 3964367af55SNeilBrown r1_bio->sector, r1_bio->sectors, 3974367af55SNeilBrown &first_bad, &bad_sectors)) { 3984367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 3994367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4004367af55SNeilBrown } 4014367af55SNeilBrown } 4024367af55SNeilBrown 4031da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 4041da177e4SLinus Torvalds 4054b6d287fSNeilBrown if (behind) { 4064b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 4074b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4084b6d287fSNeilBrown 409e9c7469bSTejun Heo /* 410e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 411e9c7469bSTejun Heo * has safely reached all non-writemostly 412e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 413e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 414e9c7469bSTejun Heo * -EIO here, instead we'll wait 415e9c7469bSTejun Heo */ 4164b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4174b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4184b6d287fSNeilBrown /* Maybe we can return now */ 4194b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4204b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 4214b6d287fSNeilBrown PRINTK(KERN_DEBUG "raid1: behind end write sectors %llu-%llu\n", 4224b6d287fSNeilBrown (unsigned long long) mbio->bi_sector, 4234b6d287fSNeilBrown (unsigned long long) mbio->bi_sector + 4244b6d287fSNeilBrown (mbio->bi_size >> 9) - 1); 425d2eb35acSNeilBrown call_bio_endio(r1_bio); 4264b6d287fSNeilBrown } 4274b6d287fSNeilBrown } 4284b6d287fSNeilBrown } 4294367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 4304367af55SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, 4314367af55SNeilBrown conf->mddev); 432e9c7469bSTejun Heo 4331da177e4SLinus Torvalds /* 4341da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4351da177e4SLinus Torvalds * already. 4361da177e4SLinus Torvalds */ 437af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 438c70810b3SNeilBrown 43904b857f7SNeilBrown if (to_put) 44004b857f7SNeilBrown bio_put(to_put); 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds /* 4451da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4461da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4471da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4481da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4491da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 4501da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 4511da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 4521da177e4SLinus Torvalds * 4531da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 4541da177e4SLinus Torvalds * because position is mirror, not device based. 4551da177e4SLinus Torvalds * 4561da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 4571da177e4SLinus Torvalds */ 458d2eb35acSNeilBrown static int read_balance(conf_t *conf, r1bio_t *r1_bio, int *max_sectors) 4591da177e4SLinus Torvalds { 460af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 461d2eb35acSNeilBrown int sectors; 462d2eb35acSNeilBrown int best_good_sectors; 463f3ac8bf7SNeilBrown int start_disk; 46476073054SNeilBrown int best_disk; 465f3ac8bf7SNeilBrown int i; 46676073054SNeilBrown sector_t best_dist; 4678ddf9efeSNeilBrown mdk_rdev_t *rdev; 468f3ac8bf7SNeilBrown int choose_first; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds rcu_read_lock(); 4711da177e4SLinus Torvalds /* 4728ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 4731da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 4741da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 4751da177e4SLinus Torvalds */ 4761da177e4SLinus Torvalds retry: 477d2eb35acSNeilBrown sectors = r1_bio->sectors; 47876073054SNeilBrown best_disk = -1; 47976073054SNeilBrown best_dist = MaxSector; 480d2eb35acSNeilBrown best_good_sectors = 0; 481d2eb35acSNeilBrown 4821da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 4831da177e4SLinus Torvalds (this_sector + sectors >= conf->next_resync)) { 484f3ac8bf7SNeilBrown choose_first = 1; 485f3ac8bf7SNeilBrown start_disk = 0; 486f3ac8bf7SNeilBrown } else { 487f3ac8bf7SNeilBrown choose_first = 0; 488f3ac8bf7SNeilBrown start_disk = conf->last_used; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 491f3ac8bf7SNeilBrown for (i = 0 ; i < conf->raid_disks ; i++) { 49276073054SNeilBrown sector_t dist; 493d2eb35acSNeilBrown sector_t first_bad; 494d2eb35acSNeilBrown int bad_sectors; 495d2eb35acSNeilBrown 496f3ac8bf7SNeilBrown int disk = start_disk + i; 497f3ac8bf7SNeilBrown if (disk >= conf->raid_disks) 498f3ac8bf7SNeilBrown disk -= conf->raid_disks; 4998ddf9efeSNeilBrown 500f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 501f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 502f3ac8bf7SNeilBrown || rdev == NULL 50376073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 504f3ac8bf7SNeilBrown continue; 50576073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 50676073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 50776073054SNeilBrown continue; 50876073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 50976073054SNeilBrown /* Don't balance among write-mostly, just 51076073054SNeilBrown * use the first as a last resort */ 51176073054SNeilBrown if (best_disk < 0) 51276073054SNeilBrown best_disk = disk; 51376073054SNeilBrown continue; 5148ddf9efeSNeilBrown } 51576073054SNeilBrown /* This is a reasonable device to use. It might 51676073054SNeilBrown * even be best. 5171da177e4SLinus Torvalds */ 518d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 519d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 520d2eb35acSNeilBrown if (best_dist < MaxSector) 521d2eb35acSNeilBrown /* already have a better device */ 522d2eb35acSNeilBrown continue; 523d2eb35acSNeilBrown if (first_bad <= this_sector) { 524d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 525d2eb35acSNeilBrown * device, then we must not read beyond 526d2eb35acSNeilBrown * bad_sectors from another device.. 527d2eb35acSNeilBrown */ 528d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 529d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 530d2eb35acSNeilBrown sectors = bad_sectors; 531d2eb35acSNeilBrown if (best_good_sectors > sectors) 532d2eb35acSNeilBrown best_good_sectors = sectors; 533d2eb35acSNeilBrown 534d2eb35acSNeilBrown } else { 535d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 536d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 537d2eb35acSNeilBrown best_good_sectors = good_sectors; 538d2eb35acSNeilBrown best_disk = disk; 539d2eb35acSNeilBrown } 540d2eb35acSNeilBrown if (choose_first) 541d2eb35acSNeilBrown break; 542d2eb35acSNeilBrown } 543d2eb35acSNeilBrown continue; 544d2eb35acSNeilBrown } else 545d2eb35acSNeilBrown best_good_sectors = sectors; 546d2eb35acSNeilBrown 54776073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 54876073054SNeilBrown if (choose_first 54976073054SNeilBrown /* Don't change to another disk for sequential reads */ 55076073054SNeilBrown || conf->next_seq_sect == this_sector 55176073054SNeilBrown || dist == 0 55276073054SNeilBrown /* If device is idle, use it */ 55376073054SNeilBrown || atomic_read(&rdev->nr_pending) == 0) { 55476073054SNeilBrown best_disk = disk; 5551da177e4SLinus Torvalds break; 5561da177e4SLinus Torvalds } 55776073054SNeilBrown if (dist < best_dist) { 55876073054SNeilBrown best_dist = dist; 55976073054SNeilBrown best_disk = disk; 5601da177e4SLinus Torvalds } 561f3ac8bf7SNeilBrown } 5621da177e4SLinus Torvalds 56376073054SNeilBrown if (best_disk >= 0) { 56476073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 5658ddf9efeSNeilBrown if (!rdev) 5668ddf9efeSNeilBrown goto retry; 5678ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 56876073054SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 5691da177e4SLinus Torvalds /* cannot risk returning a device that failed 5701da177e4SLinus Torvalds * before we inc'ed nr_pending 5711da177e4SLinus Torvalds */ 57203c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 5731da177e4SLinus Torvalds goto retry; 5741da177e4SLinus Torvalds } 575d2eb35acSNeilBrown sectors = best_good_sectors; 5768ddf9efeSNeilBrown conf->next_seq_sect = this_sector + sectors; 57776073054SNeilBrown conf->last_used = best_disk; 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds rcu_read_unlock(); 580d2eb35acSNeilBrown *max_sectors = sectors; 5811da177e4SLinus Torvalds 58276073054SNeilBrown return best_disk; 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds 5851ed7242eSJonathan Brassow int md_raid1_congested(mddev_t *mddev, int bits) 5860d129228SNeilBrown { 587070ec55dSNeilBrown conf_t *conf = mddev->private; 5880d129228SNeilBrown int i, ret = 0; 5890d129228SNeilBrown 5900d129228SNeilBrown rcu_read_lock(); 5910d129228SNeilBrown for (i = 0; i < mddev->raid_disks; i++) { 5920d129228SNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 5930d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 594165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 5950d129228SNeilBrown 5961ed7242eSJonathan Brassow BUG_ON(!q); 5971ed7242eSJonathan Brassow 5980d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 5990d129228SNeilBrown * non-congested targets, it can be removed 6000d129228SNeilBrown */ 60191a9e99dSAlexander Beregalov if ((bits & (1<<BDI_async_congested)) || 1) 6020d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 6030d129228SNeilBrown else 6040d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 6050d129228SNeilBrown } 6060d129228SNeilBrown } 6070d129228SNeilBrown rcu_read_unlock(); 6080d129228SNeilBrown return ret; 6090d129228SNeilBrown } 6101ed7242eSJonathan Brassow EXPORT_SYMBOL_GPL(md_raid1_congested); 6110d129228SNeilBrown 6121ed7242eSJonathan Brassow static int raid1_congested(void *data, int bits) 6131ed7242eSJonathan Brassow { 6141ed7242eSJonathan Brassow mddev_t *mddev = data; 6151ed7242eSJonathan Brassow 6161ed7242eSJonathan Brassow return mddev_congested(mddev, bits) || 6171ed7242eSJonathan Brassow md_raid1_congested(mddev, bits); 6181ed7242eSJonathan Brassow } 6190d129228SNeilBrown 6207eaceaccSJens Axboe static void flush_pending_writes(conf_t *conf) 621a35e63efSNeilBrown { 622a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 623a35e63efSNeilBrown * bitmap updates get flushed here. 624a35e63efSNeilBrown */ 625a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 626a35e63efSNeilBrown 627a35e63efSNeilBrown if (conf->pending_bio_list.head) { 628a35e63efSNeilBrown struct bio *bio; 629a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 630a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 631a35e63efSNeilBrown /* flush any pending bitmap writes to 632a35e63efSNeilBrown * disk before proceeding w/ I/O */ 633a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 634a35e63efSNeilBrown 635a35e63efSNeilBrown while (bio) { /* submit pending writes */ 636a35e63efSNeilBrown struct bio *next = bio->bi_next; 637a35e63efSNeilBrown bio->bi_next = NULL; 638a35e63efSNeilBrown generic_make_request(bio); 639a35e63efSNeilBrown bio = next; 640a35e63efSNeilBrown } 641a35e63efSNeilBrown } else 642a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 6437eaceaccSJens Axboe } 6447eaceaccSJens Axboe 64517999be4SNeilBrown /* Barriers.... 64617999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 64717999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 64817999be4SNeilBrown * To do this we raise a 'barrier'. 64917999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 65017999be4SNeilBrown * to count how many activities are happening which preclude 65117999be4SNeilBrown * normal IO. 65217999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 65317999be4SNeilBrown * i.e. if nr_pending == 0. 65417999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 65517999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 65617999be4SNeilBrown * is ready, no other operations which require a barrier will start 65717999be4SNeilBrown * until the IO request has had a chance. 65817999be4SNeilBrown * 65917999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 66017999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 66117999be4SNeilBrown * allow_barrier when it has finished its IO. 66217999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 66317999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 66417999be4SNeilBrown * lower_barrier when the particular background IO completes. 6651da177e4SLinus Torvalds */ 6661da177e4SLinus Torvalds #define RESYNC_DEPTH 32 6671da177e4SLinus Torvalds 66817999be4SNeilBrown static void raise_barrier(conf_t *conf) 6691da177e4SLinus Torvalds { 6701da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 6711da177e4SLinus Torvalds 67217999be4SNeilBrown /* Wait until no block IO is waiting */ 67317999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 674c3b328acSNeilBrown conf->resync_lock, ); 67517999be4SNeilBrown 67617999be4SNeilBrown /* block any new IO from starting */ 67717999be4SNeilBrown conf->barrier++; 67817999be4SNeilBrown 679046abeedSNeilBrown /* Now wait for all pending IO to complete */ 68017999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 68117999be4SNeilBrown !conf->nr_pending && conf->barrier < RESYNC_DEPTH, 682c3b328acSNeilBrown conf->resync_lock, ); 68317999be4SNeilBrown 6841da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 68717999be4SNeilBrown static void lower_barrier(conf_t *conf) 68817999be4SNeilBrown { 68917999be4SNeilBrown unsigned long flags; 690709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 69117999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 69217999be4SNeilBrown conf->barrier--; 69317999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 69417999be4SNeilBrown wake_up(&conf->wait_barrier); 69517999be4SNeilBrown } 69617999be4SNeilBrown 69717999be4SNeilBrown static void wait_barrier(conf_t *conf) 69817999be4SNeilBrown { 69917999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 70017999be4SNeilBrown if (conf->barrier) { 70117999be4SNeilBrown conf->nr_waiting++; 70217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->barrier, 70317999be4SNeilBrown conf->resync_lock, 704c3b328acSNeilBrown ); 70517999be4SNeilBrown conf->nr_waiting--; 70617999be4SNeilBrown } 70717999be4SNeilBrown conf->nr_pending++; 70817999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 70917999be4SNeilBrown } 71017999be4SNeilBrown 71117999be4SNeilBrown static void allow_barrier(conf_t *conf) 71217999be4SNeilBrown { 71317999be4SNeilBrown unsigned long flags; 71417999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 71517999be4SNeilBrown conf->nr_pending--; 71617999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 71717999be4SNeilBrown wake_up(&conf->wait_barrier); 71817999be4SNeilBrown } 71917999be4SNeilBrown 720ddaf22abSNeilBrown static void freeze_array(conf_t *conf) 721ddaf22abSNeilBrown { 722ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 723ddaf22abSNeilBrown * go quite. 724ddaf22abSNeilBrown * We increment barrier and nr_waiting, and then 7251c830532SNeilBrown * wait until nr_pending match nr_queued+1 7261c830532SNeilBrown * This is called in the context of one normal IO request 7271c830532SNeilBrown * that has failed. Thus any sync request that might be pending 7281c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 7291c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 7301c830532SNeilBrown * Thus the number queued (nr_queued) plus this request (1) 7311c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 7321c830532SNeilBrown * we continue. 733ddaf22abSNeilBrown */ 734ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 735ddaf22abSNeilBrown conf->barrier++; 736ddaf22abSNeilBrown conf->nr_waiting++; 737ddaf22abSNeilBrown wait_event_lock_irq(conf->wait_barrier, 7381c830532SNeilBrown conf->nr_pending == conf->nr_queued+1, 739ddaf22abSNeilBrown conf->resync_lock, 740c3b328acSNeilBrown flush_pending_writes(conf)); 741ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 742ddaf22abSNeilBrown } 743ddaf22abSNeilBrown static void unfreeze_array(conf_t *conf) 744ddaf22abSNeilBrown { 745ddaf22abSNeilBrown /* reverse the effect of the freeze */ 746ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 747ddaf22abSNeilBrown conf->barrier--; 748ddaf22abSNeilBrown conf->nr_waiting--; 749ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 750ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 751ddaf22abSNeilBrown } 752ddaf22abSNeilBrown 75317999be4SNeilBrown 7544e78064fSNeilBrown /* duplicate the data pages for behind I/O 7554e78064fSNeilBrown */ 756af6d7b76SNeilBrown static void alloc_behind_pages(struct bio *bio, r1bio_t *r1_bio) 7574b6d287fSNeilBrown { 7584b6d287fSNeilBrown int i; 7594b6d287fSNeilBrown struct bio_vec *bvec; 7602ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 7614b6d287fSNeilBrown GFP_NOIO); 7622ca68f5eSNeilBrown if (unlikely(!bvecs)) 763af6d7b76SNeilBrown return; 7644b6d287fSNeilBrown 7654b6d287fSNeilBrown bio_for_each_segment(bvec, bio, i) { 7662ca68f5eSNeilBrown bvecs[i] = *bvec; 7672ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 7682ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 7694b6d287fSNeilBrown goto do_sync_io; 7702ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 7714b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 7722ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 7734b6d287fSNeilBrown kunmap(bvec->bv_page); 7744b6d287fSNeilBrown } 7752ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 776af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 777af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 778af6d7b76SNeilBrown return; 7794b6d287fSNeilBrown 7804b6d287fSNeilBrown do_sync_io: 781af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 7822ca68f5eSNeilBrown if (bvecs[i].bv_page) 7832ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 7842ca68f5eSNeilBrown kfree(bvecs); 7854b6d287fSNeilBrown PRINTK("%dB behind alloc failed, doing sync I/O\n", bio->bi_size); 7864b6d287fSNeilBrown } 7874b6d287fSNeilBrown 7885a7bbad2SChristoph Hellwig static void make_request(mddev_t *mddev, struct bio * bio) 7891da177e4SLinus Torvalds { 790070ec55dSNeilBrown conf_t *conf = mddev->private; 7911da177e4SLinus Torvalds mirror_info_t *mirror; 7921da177e4SLinus Torvalds r1bio_t *r1_bio; 7931da177e4SLinus Torvalds struct bio *read_bio; 7941f68f0c4SNeilBrown int i, disks; 79584255d10SNeilBrown struct bitmap *bitmap; 796191ea9b2SNeilBrown unsigned long flags; 797a362357bSJens Axboe const int rw = bio_data_dir(bio); 7982c7d46ecSNeilBrown const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); 799e9c7469bSTejun Heo const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); 8006bfe0b49SDan Williams mdk_rdev_t *blocked_rdev; 801c3b328acSNeilBrown int plugged; 8021f68f0c4SNeilBrown int first_clone; 8031f68f0c4SNeilBrown int sectors_handled; 8041f68f0c4SNeilBrown int max_sectors; 805191ea9b2SNeilBrown 8061da177e4SLinus Torvalds /* 8071da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 8081da177e4SLinus Torvalds * thread has put up a bar for new requests. 8091da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 8101da177e4SLinus Torvalds */ 81162de608dSNeilBrown 8123d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 8133d310eb7SNeilBrown 8146eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 8156eef4b21SNeilBrown bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo && 8166eef4b21SNeilBrown bio->bi_sector < mddev->suspend_hi) { 8176eef4b21SNeilBrown /* As the suspend_* range is controlled by 8186eef4b21SNeilBrown * userspace, we want an interruptible 8196eef4b21SNeilBrown * wait. 8206eef4b21SNeilBrown */ 8216eef4b21SNeilBrown DEFINE_WAIT(w); 8226eef4b21SNeilBrown for (;;) { 8236eef4b21SNeilBrown flush_signals(current); 8246eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 8256eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 8266eef4b21SNeilBrown if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo || 8276eef4b21SNeilBrown bio->bi_sector >= mddev->suspend_hi) 8286eef4b21SNeilBrown break; 8296eef4b21SNeilBrown schedule(); 8306eef4b21SNeilBrown } 8316eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 8326eef4b21SNeilBrown } 83362de608dSNeilBrown 83417999be4SNeilBrown wait_barrier(conf); 8351da177e4SLinus Torvalds 83684255d10SNeilBrown bitmap = mddev->bitmap; 83784255d10SNeilBrown 8381da177e4SLinus Torvalds /* 8391da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 8401da177e4SLinus Torvalds * used and no empty request is available. 8411da177e4SLinus Torvalds * 8421da177e4SLinus Torvalds */ 8431da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds r1_bio->master_bio = bio; 8461da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 847191ea9b2SNeilBrown r1_bio->state = 0; 8481da177e4SLinus Torvalds r1_bio->mddev = mddev; 8491da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 8501da177e4SLinus Torvalds 851d2eb35acSNeilBrown /* We might need to issue multiple reads to different 852d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 853d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 854d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 855d2eb35acSNeilBrown * will be needed when requests complete. If it is 856d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 857d2eb35acSNeilBrown */ 858d2eb35acSNeilBrown bio->bi_phys_segments = 0; 859d2eb35acSNeilBrown clear_bit(BIO_SEG_VALID, &bio->bi_flags); 860d2eb35acSNeilBrown 861a362357bSJens Axboe if (rw == READ) { 8621da177e4SLinus Torvalds /* 8631da177e4SLinus Torvalds * read balancing logic: 8641da177e4SLinus Torvalds */ 865d2eb35acSNeilBrown int rdisk; 866d2eb35acSNeilBrown 867d2eb35acSNeilBrown read_again: 868d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds if (rdisk < 0) { 8711da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 8721da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 8735a7bbad2SChristoph Hellwig return; 8741da177e4SLinus Torvalds } 8751da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 8761da177e4SLinus Torvalds 877e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 878e555190dSNeilBrown bitmap) { 879e555190dSNeilBrown /* Reading from a write-mostly device must 880e555190dSNeilBrown * take care not to over-take any writes 881e555190dSNeilBrown * that are 'behind' 882e555190dSNeilBrown */ 883e555190dSNeilBrown wait_event(bitmap->behind_wait, 884e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 885e555190dSNeilBrown } 8861da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 8871da177e4SLinus Torvalds 888a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 889d2eb35acSNeilBrown md_trim_bio(read_bio, r1_bio->sector - bio->bi_sector, 890d2eb35acSNeilBrown max_sectors); 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 8951da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 8961da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 8977b6d91daSChristoph Hellwig read_bio->bi_rw = READ | do_sync; 8981da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 8991da177e4SLinus Torvalds 900d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 901d2eb35acSNeilBrown /* could not read all from this device, so we will 902d2eb35acSNeilBrown * need another r1_bio. 903d2eb35acSNeilBrown */ 904d2eb35acSNeilBrown 905d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 906d2eb35acSNeilBrown - bio->bi_sector); 907d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 908d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 909d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 910d2eb35acSNeilBrown bio->bi_phys_segments = 2; 911d2eb35acSNeilBrown else 912d2eb35acSNeilBrown bio->bi_phys_segments++; 913d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 914d2eb35acSNeilBrown /* Cannot call generic_make_request directly 915d2eb35acSNeilBrown * as that will be queued in __make_request 916d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 917d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 918d2eb35acSNeilBrown */ 919d2eb35acSNeilBrown reschedule_retry(r1_bio); 920d2eb35acSNeilBrown 921d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 922d2eb35acSNeilBrown 923d2eb35acSNeilBrown r1_bio->master_bio = bio; 924d2eb35acSNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 925d2eb35acSNeilBrown r1_bio->state = 0; 926d2eb35acSNeilBrown r1_bio->mddev = mddev; 927d2eb35acSNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 928d2eb35acSNeilBrown goto read_again; 929d2eb35acSNeilBrown } else 9301da177e4SLinus Torvalds generic_make_request(read_bio); 9315a7bbad2SChristoph Hellwig return; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /* 9351da177e4SLinus Torvalds * WRITE: 9361da177e4SLinus Torvalds */ 9371f68f0c4SNeilBrown /* first select target devices under rcu_lock and 9381da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 9391da177e4SLinus Torvalds * bios[x] to bio 9401f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 9411f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 9421f68f0c4SNeilBrown * blocks. 9431f68f0c4SNeilBrown * This potentially requires several writes to write around 9441f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 9451f68f0c4SNeilBrown * with a set of bios attached. 9461da177e4SLinus Torvalds */ 947c3b328acSNeilBrown plugged = mddev_check_plugged(mddev); 948c3b328acSNeilBrown 9491da177e4SLinus Torvalds disks = conf->raid_disks; 9506bfe0b49SDan Williams retry_write: 9516bfe0b49SDan Williams blocked_rdev = NULL; 9521da177e4SLinus Torvalds rcu_read_lock(); 9531f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 9541da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 9556bfe0b49SDan Williams mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 9566bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 9576bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 9586bfe0b49SDan Williams blocked_rdev = rdev; 9596bfe0b49SDan Williams break; 9606bfe0b49SDan Williams } 9611da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 9621f68f0c4SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) { 9631f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 9641f68f0c4SNeilBrown continue; 965964147d5SNeilBrown } 9661f68f0c4SNeilBrown 9671f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 9681f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 9691f68f0c4SNeilBrown sector_t first_bad; 9701f68f0c4SNeilBrown int bad_sectors; 9711f68f0c4SNeilBrown int is_bad; 9721f68f0c4SNeilBrown 9731f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 9741f68f0c4SNeilBrown max_sectors, 9751f68f0c4SNeilBrown &first_bad, &bad_sectors); 9761f68f0c4SNeilBrown if (is_bad < 0) { 9771f68f0c4SNeilBrown /* mustn't write here until the bad block is 9781f68f0c4SNeilBrown * acknowledged*/ 9791f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 9801f68f0c4SNeilBrown blocked_rdev = rdev; 9811f68f0c4SNeilBrown break; 9821f68f0c4SNeilBrown } 9831f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 9841f68f0c4SNeilBrown /* Cannot write here at all */ 9851f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 9861f68f0c4SNeilBrown if (bad_sectors < max_sectors) 9871f68f0c4SNeilBrown /* mustn't write more than bad_sectors 9881f68f0c4SNeilBrown * to other devices yet 9891f68f0c4SNeilBrown */ 9901f68f0c4SNeilBrown max_sectors = bad_sectors; 9911f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 9921f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 9931f68f0c4SNeilBrown * only applies if the disk is 9941f68f0c4SNeilBrown * missing, so it might be re-added, 9951f68f0c4SNeilBrown * and we want to know to recover this 9961f68f0c4SNeilBrown * chunk. 9971f68f0c4SNeilBrown * In this case the device is here, 9981f68f0c4SNeilBrown * and the fact that this chunk is not 9991f68f0c4SNeilBrown * in-sync is recorded in the bad 10001f68f0c4SNeilBrown * block log 10011f68f0c4SNeilBrown */ 10021f68f0c4SNeilBrown continue; 10031f68f0c4SNeilBrown } 10041f68f0c4SNeilBrown if (is_bad) { 10051f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 10061f68f0c4SNeilBrown if (good_sectors < max_sectors) 10071f68f0c4SNeilBrown max_sectors = good_sectors; 10081f68f0c4SNeilBrown } 10091f68f0c4SNeilBrown } 10101f68f0c4SNeilBrown r1_bio->bios[i] = bio; 10111da177e4SLinus Torvalds } 10121da177e4SLinus Torvalds rcu_read_unlock(); 10131da177e4SLinus Torvalds 10146bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 10156bfe0b49SDan Williams /* Wait for this device to become unblocked */ 10166bfe0b49SDan Williams int j; 10176bfe0b49SDan Williams 10186bfe0b49SDan Williams for (j = 0; j < i; j++) 10196bfe0b49SDan Williams if (r1_bio->bios[j]) 10206bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 10211f68f0c4SNeilBrown r1_bio->state = 0; 10226bfe0b49SDan Williams allow_barrier(conf); 10236bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 10246bfe0b49SDan Williams wait_barrier(conf); 10256bfe0b49SDan Williams goto retry_write; 10266bfe0b49SDan Williams } 10276bfe0b49SDan Williams 10281f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 10291f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 10301f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 10311f68f0c4SNeilBrown */ 10321f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 10331f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 10341f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 10351f68f0c4SNeilBrown bio->bi_phys_segments = 2; 10361f68f0c4SNeilBrown else 10371f68f0c4SNeilBrown bio->bi_phys_segments++; 10381f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1039191ea9b2SNeilBrown } 10401f68f0c4SNeilBrown sectors_handled = r1_bio->sector + max_sectors - bio->bi_sector; 10414b6d287fSNeilBrown 10424e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 10434b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1044191ea9b2SNeilBrown 10451f68f0c4SNeilBrown first_clone = 1; 10461da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 10471da177e4SLinus Torvalds struct bio *mbio; 10481da177e4SLinus Torvalds if (!r1_bio->bios[i]) 10491da177e4SLinus Torvalds continue; 10501da177e4SLinus Torvalds 1051a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 10521f68f0c4SNeilBrown md_trim_bio(mbio, r1_bio->sector - bio->bi_sector, max_sectors); 10531da177e4SLinus Torvalds 10541f68f0c4SNeilBrown if (first_clone) { 10551f68f0c4SNeilBrown /* do behind I/O ? 10561f68f0c4SNeilBrown * Not if there are too many, or cannot 10571f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 10581f68f0c4SNeilBrown * is waiting for behind writes to flush */ 10591f68f0c4SNeilBrown if (bitmap && 10601f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 10611f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 10621f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 10631f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 10641da177e4SLinus Torvalds 10651f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 10661f68f0c4SNeilBrown r1_bio->sectors, 10671f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 10681f68f0c4SNeilBrown &r1_bio->state)); 10691f68f0c4SNeilBrown first_clone = 0; 10701f68f0c4SNeilBrown } 10712ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 10724b6d287fSNeilBrown struct bio_vec *bvec; 10734b6d287fSNeilBrown int j; 10744b6d287fSNeilBrown 10754b6d287fSNeilBrown /* Yes, I really want the '__' version so that 10764b6d287fSNeilBrown * we clear any unused pointer in the io_vec, rather 10774b6d287fSNeilBrown * than leave them unchanged. This is important 10784b6d287fSNeilBrown * because when we come to free the pages, we won't 1079046abeedSNeilBrown * know the original bi_idx, so we just free 10804b6d287fSNeilBrown * them all 10814b6d287fSNeilBrown */ 10824b6d287fSNeilBrown __bio_for_each_segment(bvec, mbio, j, 0) 10832ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 10844b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 10854b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 10864b6d287fSNeilBrown } 10874b6d287fSNeilBrown 10881f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 10891f68f0c4SNeilBrown 10901f68f0c4SNeilBrown mbio->bi_sector = (r1_bio->sector + 10911f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 10921f68f0c4SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 10931f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 10941f68f0c4SNeilBrown mbio->bi_rw = WRITE | do_flush_fua | do_sync; 10951f68f0c4SNeilBrown mbio->bi_private = r1_bio; 10961f68f0c4SNeilBrown 10971da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1098191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 10994e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 1100191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 11014e78064fSNeilBrown } 1102af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 1103191ea9b2SNeilBrown 1104a35e63efSNeilBrown /* In case raid1d snuck in to freeze_array */ 1105a35e63efSNeilBrown wake_up(&conf->wait_barrier); 1106a35e63efSNeilBrown 11071f68f0c4SNeilBrown if (sectors_handled < (bio->bi_size >> 9)) { 11081f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 11091f68f0c4SNeilBrown * in bio->bi_phys_segments 11101f68f0c4SNeilBrown */ 11111f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 11121f68f0c4SNeilBrown r1_bio->master_bio = bio; 11131f68f0c4SNeilBrown r1_bio->sectors = (bio->bi_size >> 9) - sectors_handled; 11141f68f0c4SNeilBrown r1_bio->state = 0; 11151f68f0c4SNeilBrown r1_bio->mddev = mddev; 11161f68f0c4SNeilBrown r1_bio->sector = bio->bi_sector + sectors_handled; 11171f68f0c4SNeilBrown goto retry_write; 11181f68f0c4SNeilBrown } 11191f68f0c4SNeilBrown 1120c3b328acSNeilBrown if (do_sync || !bitmap || !plugged) 1121e3881a68SLars Ellenberg md_wakeup_thread(mddev->thread); 11221da177e4SLinus Torvalds } 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds static void status(struct seq_file *seq, mddev_t *mddev) 11251da177e4SLinus Torvalds { 1126070ec55dSNeilBrown conf_t *conf = mddev->private; 11271da177e4SLinus Torvalds int i; 11281da177e4SLinus Torvalds 11291da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 113011ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1131ddac7c7eSNeilBrown rcu_read_lock(); 1132ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 1133ddac7c7eSNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 11341da177e4SLinus Torvalds seq_printf(seq, "%s", 1135ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1136ddac7c7eSNeilBrown } 1137ddac7c7eSNeilBrown rcu_read_unlock(); 11381da177e4SLinus Torvalds seq_printf(seq, "]"); 11391da177e4SLinus Torvalds } 11401da177e4SLinus Torvalds 11411da177e4SLinus Torvalds 11421da177e4SLinus Torvalds static void error(mddev_t *mddev, mdk_rdev_t *rdev) 11431da177e4SLinus Torvalds { 11441da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1145070ec55dSNeilBrown conf_t *conf = mddev->private; 11461da177e4SLinus Torvalds 11471da177e4SLinus Torvalds /* 11481da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 11491da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 11501da177e4SLinus Torvalds * next level up know. 11511da177e4SLinus Torvalds * else mark the drive as failed 11521da177e4SLinus Torvalds */ 1153b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 11544044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 11551da177e4SLinus Torvalds /* 11561da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 11574044ba58SNeilBrown * normal single drive. 11584044ba58SNeilBrown * However don't try a recovery from this drive as 11594044ba58SNeilBrown * it is very likely to fail. 11601da177e4SLinus Torvalds */ 11615389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 11621da177e4SLinus Torvalds return; 11634044ba58SNeilBrown } 1164de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1165c04be0aaSNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 1166c04be0aaSNeilBrown unsigned long flags; 1167c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 11681da177e4SLinus Torvalds mddev->degraded++; 1169dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1170c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 11711da177e4SLinus Torvalds /* 11721da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 11731da177e4SLinus Torvalds */ 1174dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1175dd00a99eSNeilBrown } else 1176b2d444d7SNeilBrown set_bit(Faulty, &rdev->flags); 1177850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 1178067032bcSJoe Perches printk(KERN_ALERT 1179067032bcSJoe Perches "md/raid1:%s: Disk failure on %s, disabling device.\n" 1180067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 11819dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 11829dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 11831da177e4SLinus Torvalds } 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds static void print_conf(conf_t *conf) 11861da177e4SLinus Torvalds { 11871da177e4SLinus Torvalds int i; 11881da177e4SLinus Torvalds 11899dd1e2faSNeilBrown printk(KERN_DEBUG "RAID1 conf printout:\n"); 11901da177e4SLinus Torvalds if (!conf) { 11919dd1e2faSNeilBrown printk(KERN_DEBUG "(!conf)\n"); 11921da177e4SLinus Torvalds return; 11931da177e4SLinus Torvalds } 11949dd1e2faSNeilBrown printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 11951da177e4SLinus Torvalds conf->raid_disks); 11961da177e4SLinus Torvalds 1197ddac7c7eSNeilBrown rcu_read_lock(); 11981da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 11991da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1200ddac7c7eSNeilBrown mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev); 1201ddac7c7eSNeilBrown if (rdev) 12029dd1e2faSNeilBrown printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", 1203ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1204ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1205ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 12061da177e4SLinus Torvalds } 1207ddac7c7eSNeilBrown rcu_read_unlock(); 12081da177e4SLinus Torvalds } 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds static void close_sync(conf_t *conf) 12111da177e4SLinus Torvalds { 121217999be4SNeilBrown wait_barrier(conf); 121317999be4SNeilBrown allow_barrier(conf); 12141da177e4SLinus Torvalds 12151da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 12161da177e4SLinus Torvalds conf->r1buf_pool = NULL; 12171da177e4SLinus Torvalds } 12181da177e4SLinus Torvalds 12191da177e4SLinus Torvalds static int raid1_spare_active(mddev_t *mddev) 12201da177e4SLinus Torvalds { 12211da177e4SLinus Torvalds int i; 12221da177e4SLinus Torvalds conf_t *conf = mddev->private; 12236b965620SNeilBrown int count = 0; 12246b965620SNeilBrown unsigned long flags; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds /* 12271da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1228ddac7c7eSNeilBrown * and mark them readable. 1229ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 12301da177e4SLinus Torvalds */ 12311da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 1232ddac7c7eSNeilBrown mdk_rdev_t *rdev = conf->mirrors[i].rdev; 1233ddac7c7eSNeilBrown if (rdev 1234ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1235c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 12366b965620SNeilBrown count++; 1237654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 12381da177e4SLinus Torvalds } 12391da177e4SLinus Torvalds } 12406b965620SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 12416b965620SNeilBrown mddev->degraded -= count; 12426b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds print_conf(conf); 12456b965620SNeilBrown return count; 12461da177e4SLinus Torvalds } 12471da177e4SLinus Torvalds 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) 12501da177e4SLinus Torvalds { 12511da177e4SLinus Torvalds conf_t *conf = mddev->private; 1252199050eaSNeil Brown int err = -EEXIST; 125341158c7eSNeilBrown int mirror = 0; 12541da177e4SLinus Torvalds mirror_info_t *p; 12556c2fce2eSNeil Brown int first = 0; 12566c2fce2eSNeil Brown int last = mddev->raid_disks - 1; 12571da177e4SLinus Torvalds 12585389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 12595389042fSNeilBrown return -EBUSY; 12605389042fSNeilBrown 12616c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 12626c2fce2eSNeil Brown first = last = rdev->raid_disk; 12636c2fce2eSNeil Brown 12646c2fce2eSNeil Brown for (mirror = first; mirror <= last; mirror++) 12651da177e4SLinus Torvalds if ( !(p=conf->mirrors+mirror)->rdev) { 12661da177e4SLinus Torvalds 12678f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 12688f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 1269627a2d3cSNeilBrown /* as we don't honour merge_bvec_fn, we must 1270627a2d3cSNeilBrown * never risk violating it, so limit 1271627a2d3cSNeilBrown * ->max_segments to one lying with a single 1272627a2d3cSNeilBrown * page, as a one page request is never in 1273627a2d3cSNeilBrown * violation. 12741da177e4SLinus Torvalds */ 1275627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 1276627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 1277627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 1278627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 1279627a2d3cSNeilBrown } 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds p->head_position = 0; 12821da177e4SLinus Torvalds rdev->raid_disk = mirror; 1283199050eaSNeil Brown err = 0; 12846aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 12856aea114aSNeilBrown * if this was recently any drive of the array 12866aea114aSNeilBrown */ 12876aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 128841158c7eSNeilBrown conf->fullsync = 1; 1289d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 12901da177e4SLinus Torvalds break; 12911da177e4SLinus Torvalds } 1292ac5e7113SAndre Noll md_integrity_add_rdev(rdev, mddev); 12931da177e4SLinus Torvalds print_conf(conf); 1294199050eaSNeil Brown return err; 12951da177e4SLinus Torvalds } 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds static int raid1_remove_disk(mddev_t *mddev, int number) 12981da177e4SLinus Torvalds { 12991da177e4SLinus Torvalds conf_t *conf = mddev->private; 13001da177e4SLinus Torvalds int err = 0; 13011da177e4SLinus Torvalds mdk_rdev_t *rdev; 13021da177e4SLinus Torvalds mirror_info_t *p = conf->mirrors+ number; 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds print_conf(conf); 13051da177e4SLinus Torvalds rdev = p->rdev; 13061da177e4SLinus Torvalds if (rdev) { 1307b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 13081da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 13091da177e4SLinus Torvalds err = -EBUSY; 13101da177e4SLinus Torvalds goto abort; 13111da177e4SLinus Torvalds } 1312046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1313dfc70645SNeilBrown * is not possible. 1314dfc70645SNeilBrown */ 1315dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 13165389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1317dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1318dfc70645SNeilBrown err = -EBUSY; 1319dfc70645SNeilBrown goto abort; 1320dfc70645SNeilBrown } 13211da177e4SLinus Torvalds p->rdev = NULL; 1322fbd568a3SPaul E. McKenney synchronize_rcu(); 13231da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 13241da177e4SLinus Torvalds /* lost the race, try later */ 13251da177e4SLinus Torvalds err = -EBUSY; 13261da177e4SLinus Torvalds p->rdev = rdev; 1327ac5e7113SAndre Noll goto abort; 13281da177e4SLinus Torvalds } 1329a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 13301da177e4SLinus Torvalds } 13311da177e4SLinus Torvalds abort: 13321da177e4SLinus Torvalds 13331da177e4SLinus Torvalds print_conf(conf); 13341da177e4SLinus Torvalds return err; 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds 13386712ecf8SNeilBrown static void end_sync_read(struct bio *bio, int error) 13391da177e4SLinus Torvalds { 13407b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 1341d11c171eSNeilBrown int i; 13421da177e4SLinus Torvalds 1343d11c171eSNeilBrown for (i=r1_bio->mddev->raid_disks; i--; ) 1344d11c171eSNeilBrown if (r1_bio->bios[i] == bio) 1345d11c171eSNeilBrown break; 1346d11c171eSNeilBrown BUG_ON(i < 0); 1347d11c171eSNeilBrown update_head_pos(i, r1_bio); 13481da177e4SLinus Torvalds /* 13491da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 13501da177e4SLinus Torvalds * or re-read if the read failed. 13511da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 13521da177e4SLinus Torvalds */ 135369382e85SNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags)) 13541da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1355d11c171eSNeilBrown 1356d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 13571da177e4SLinus Torvalds reschedule_retry(r1_bio); 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13606712ecf8SNeilBrown static void end_sync_write(struct bio *bio, int error) 13611da177e4SLinus Torvalds { 13621da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 13637b92813cSH Hartley Sweeten r1bio_t *r1_bio = bio->bi_private; 13641da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 1365070ec55dSNeilBrown conf_t *conf = mddev->private; 13661da177e4SLinus Torvalds int i; 13671da177e4SLinus Torvalds int mirror=0; 13684367af55SNeilBrown sector_t first_bad; 13694367af55SNeilBrown int bad_sectors; 13701da177e4SLinus Torvalds 13711da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) 13721da177e4SLinus Torvalds if (r1_bio->bios[i] == bio) { 13731da177e4SLinus Torvalds mirror = i; 13741da177e4SLinus Torvalds break; 13751da177e4SLinus Torvalds } 13766b1117d5SNeilBrown if (!uptodate) { 137757dab0bdSNeilBrown sector_t sync_blocks = 0; 13786b1117d5SNeilBrown sector_t s = r1_bio->sector; 13796b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 13806b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 13816b1117d5SNeilBrown do { 13825e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 13836b1117d5SNeilBrown &sync_blocks, 1); 13846b1117d5SNeilBrown s += sync_blocks; 13856b1117d5SNeilBrown sectors_to_go -= sync_blocks; 13866b1117d5SNeilBrown } while (sectors_to_go > 0); 1387d8f05d29SNeilBrown set_bit(WriteErrorSeen, 1388d8f05d29SNeilBrown &conf->mirrors[mirror].rdev->flags); 1389d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 13904367af55SNeilBrown } else if (is_badblock(conf->mirrors[mirror].rdev, 13914367af55SNeilBrown r1_bio->sector, 13924367af55SNeilBrown r1_bio->sectors, 13933a9f28a5SNeilBrown &first_bad, &bad_sectors) && 13943a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 13953a9f28a5SNeilBrown r1_bio->sector, 13963a9f28a5SNeilBrown r1_bio->sectors, 13973a9f28a5SNeilBrown &first_bad, &bad_sectors) 13983a9f28a5SNeilBrown ) 13994367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1400e3b9703eSNeilBrown 14011da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 14021da177e4SLinus Torvalds 14031da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 14044367af55SNeilBrown int s = r1_bio->sectors; 1405d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1406d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 14074367af55SNeilBrown reschedule_retry(r1_bio); 14084367af55SNeilBrown else { 14091da177e4SLinus Torvalds put_buf(r1_bio); 141073d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 14111da177e4SLinus Torvalds } 14121da177e4SLinus Torvalds } 14134367af55SNeilBrown } 14141da177e4SLinus Torvalds 1415d8f05d29SNeilBrown static int r1_sync_page_io(mdk_rdev_t *rdev, sector_t sector, 1416d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1417d8f05d29SNeilBrown { 1418d8f05d29SNeilBrown if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1419d8f05d29SNeilBrown /* success */ 1420d8f05d29SNeilBrown return 1; 1421d8f05d29SNeilBrown if (rw == WRITE) 1422d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1423d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1424d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1425d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1426d8f05d29SNeilBrown return 0; 1427d8f05d29SNeilBrown } 1428d8f05d29SNeilBrown 1429a68e5870SNeilBrown static int fix_sync_read_error(r1bio_t *r1_bio) 14301da177e4SLinus Torvalds { 1431a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 143269382e85SNeilBrown * good data, much like with normal read errors. Only 1433ddac7c7eSNeilBrown * read into the pages we already have so we don't 143469382e85SNeilBrown * need to re-issue the read request. 143569382e85SNeilBrown * We don't need to freeze the array, because being in an 143669382e85SNeilBrown * active sync request, there is no normal IO, and 143769382e85SNeilBrown * no overlapping syncs. 143806f60385SNeilBrown * We don't need to check is_badblock() again as we 143906f60385SNeilBrown * made sure that anything with a bad block in range 144006f60385SNeilBrown * will have bi_end_io clear. 14411da177e4SLinus Torvalds */ 1442a68e5870SNeilBrown mddev_t *mddev = r1_bio->mddev; 1443a68e5870SNeilBrown conf_t *conf = mddev->private; 1444a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 144569382e85SNeilBrown sector_t sect = r1_bio->sector; 144669382e85SNeilBrown int sectors = r1_bio->sectors; 144769382e85SNeilBrown int idx = 0; 144869382e85SNeilBrown 144969382e85SNeilBrown while(sectors) { 145069382e85SNeilBrown int s = sectors; 145169382e85SNeilBrown int d = r1_bio->read_disk; 145269382e85SNeilBrown int success = 0; 145369382e85SNeilBrown mdk_rdev_t *rdev; 145478d7f5f7SNeilBrown int start; 145569382e85SNeilBrown 145669382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 145769382e85SNeilBrown s = PAGE_SIZE >> 9; 145869382e85SNeilBrown do { 145969382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1460ddac7c7eSNeilBrown /* No rcu protection needed here devices 1461ddac7c7eSNeilBrown * can only be removed when no resync is 1462ddac7c7eSNeilBrown * active, and resync is currently active 1463ddac7c7eSNeilBrown */ 146469382e85SNeilBrown rdev = conf->mirrors[d].rdev; 14659d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 146669382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1467ccebd4c4SJonathan Brassow READ, false)) { 146869382e85SNeilBrown success = 1; 146969382e85SNeilBrown break; 147069382e85SNeilBrown } 147169382e85SNeilBrown } 147269382e85SNeilBrown d++; 147369382e85SNeilBrown if (d == conf->raid_disks) 147469382e85SNeilBrown d = 0; 147569382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 147669382e85SNeilBrown 147778d7f5f7SNeilBrown if (!success) { 147878d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 14793a9f28a5SNeilBrown int abort = 0; 14803a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 14813a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 14823a9f28a5SNeilBrown * work just disable and interrupt the recovery. 14833a9f28a5SNeilBrown * Don't fail devices as that won't really help. 14843a9f28a5SNeilBrown */ 148578d7f5f7SNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" 148678d7f5f7SNeilBrown " for block %llu\n", 148778d7f5f7SNeilBrown mdname(mddev), 148878d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 148978d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 14903a9f28a5SNeilBrown for (d = 0; d < conf->raid_disks; d++) { 14913a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 14923a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 14933a9f28a5SNeilBrown continue; 14943a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 14953a9f28a5SNeilBrown abort = 1; 14963a9f28a5SNeilBrown } 14973a9f28a5SNeilBrown if (abort) { 14983a9f28a5SNeilBrown mddev->recovery_disabled = 1; 14993a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 150078d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 150178d7f5f7SNeilBrown put_buf(r1_bio); 150278d7f5f7SNeilBrown return 0; 150378d7f5f7SNeilBrown } 15043a9f28a5SNeilBrown /* Try next page */ 15053a9f28a5SNeilBrown sectors -= s; 15063a9f28a5SNeilBrown sect += s; 15073a9f28a5SNeilBrown idx++; 15083a9f28a5SNeilBrown continue; 15093a9f28a5SNeilBrown } 151078d7f5f7SNeilBrown 151178d7f5f7SNeilBrown start = d; 151269382e85SNeilBrown /* write it back and re-read */ 151369382e85SNeilBrown while (d != r1_bio->read_disk) { 151469382e85SNeilBrown if (d == 0) 151569382e85SNeilBrown d = conf->raid_disks; 151669382e85SNeilBrown d--; 151769382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 151869382e85SNeilBrown continue; 151969382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1520d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 152169382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1522d8f05d29SNeilBrown WRITE) == 0) { 152378d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 152478d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 15259d3d8011SNamhyung Kim } 1526097426f6SNeilBrown } 1527097426f6SNeilBrown d = start; 1528097426f6SNeilBrown while (d != r1_bio->read_disk) { 1529097426f6SNeilBrown if (d == 0) 1530097426f6SNeilBrown d = conf->raid_disks; 1531097426f6SNeilBrown d--; 1532097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1533097426f6SNeilBrown continue; 1534097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1535d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 153669382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1537d8f05d29SNeilBrown READ) != 0) 15389d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 153969382e85SNeilBrown } 154069382e85SNeilBrown sectors -= s; 154169382e85SNeilBrown sect += s; 154269382e85SNeilBrown idx ++; 154369382e85SNeilBrown } 154478d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 15457ca78d57SNeilBrown set_bit(BIO_UPTODATE, &bio->bi_flags); 1546a68e5870SNeilBrown return 1; 154769382e85SNeilBrown } 1548d11c171eSNeilBrown 1549a68e5870SNeilBrown static int process_checks(r1bio_t *r1_bio) 1550a68e5870SNeilBrown { 1551a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1552a68e5870SNeilBrown * got the block, then there is no hope left. 1553a68e5870SNeilBrown * If we have, then we want to do a comparison 1554a68e5870SNeilBrown * and skip the write if everything is the same. 1555a68e5870SNeilBrown * If any blocks failed to read, then we need to 1556a68e5870SNeilBrown * attempt an over-write 1557a68e5870SNeilBrown */ 1558a68e5870SNeilBrown mddev_t *mddev = r1_bio->mddev; 1559a68e5870SNeilBrown conf_t *conf = mddev->private; 1560a68e5870SNeilBrown int primary; 1561a68e5870SNeilBrown int i; 1562a68e5870SNeilBrown 156378d7f5f7SNeilBrown for (primary = 0; primary < conf->raid_disks; primary++) 1564a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 1565a68e5870SNeilBrown test_bit(BIO_UPTODATE, &r1_bio->bios[primary]->bi_flags)) { 1566a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1567a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1568a68e5870SNeilBrown break; 1569a68e5870SNeilBrown } 1570a68e5870SNeilBrown r1_bio->read_disk = primary; 157178d7f5f7SNeilBrown for (i = 0; i < conf->raid_disks; i++) { 1572a68e5870SNeilBrown int j; 1573a68e5870SNeilBrown int vcnt = r1_bio->sectors >> (PAGE_SHIFT- 9); 1574a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1575a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 157678d7f5f7SNeilBrown int size; 157778d7f5f7SNeilBrown 157878d7f5f7SNeilBrown if (r1_bio->bios[i]->bi_end_io != end_sync_read) 157978d7f5f7SNeilBrown continue; 1580a68e5870SNeilBrown 1581a68e5870SNeilBrown if (test_bit(BIO_UPTODATE, &sbio->bi_flags)) { 1582a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1583a68e5870SNeilBrown struct page *p, *s; 1584a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1585a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1586a68e5870SNeilBrown if (memcmp(page_address(p), 1587a68e5870SNeilBrown page_address(s), 1588a68e5870SNeilBrown PAGE_SIZE)) 1589a68e5870SNeilBrown break; 1590a68e5870SNeilBrown } 1591a68e5870SNeilBrown } else 1592a68e5870SNeilBrown j = 0; 1593a68e5870SNeilBrown if (j >= 0) 1594a68e5870SNeilBrown mddev->resync_mismatches += r1_bio->sectors; 1595a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 1596a68e5870SNeilBrown && test_bit(BIO_UPTODATE, &sbio->bi_flags))) { 159778d7f5f7SNeilBrown /* No need to write to this device. */ 1598a68e5870SNeilBrown sbio->bi_end_io = NULL; 1599a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 160078d7f5f7SNeilBrown continue; 160178d7f5f7SNeilBrown } 1602a68e5870SNeilBrown /* fixup the bio for reuse */ 1603a68e5870SNeilBrown sbio->bi_vcnt = vcnt; 1604a68e5870SNeilBrown sbio->bi_size = r1_bio->sectors << 9; 1605a68e5870SNeilBrown sbio->bi_idx = 0; 1606a68e5870SNeilBrown sbio->bi_phys_segments = 0; 1607a68e5870SNeilBrown sbio->bi_flags &= ~(BIO_POOL_MASK - 1); 1608a68e5870SNeilBrown sbio->bi_flags |= 1 << BIO_UPTODATE; 1609a68e5870SNeilBrown sbio->bi_next = NULL; 1610a68e5870SNeilBrown sbio->bi_sector = r1_bio->sector + 1611a68e5870SNeilBrown conf->mirrors[i].rdev->data_offset; 1612a68e5870SNeilBrown sbio->bi_bdev = conf->mirrors[i].rdev->bdev; 1613a68e5870SNeilBrown size = sbio->bi_size; 1614a68e5870SNeilBrown for (j = 0; j < vcnt ; j++) { 1615a68e5870SNeilBrown struct bio_vec *bi; 1616a68e5870SNeilBrown bi = &sbio->bi_io_vec[j]; 1617a68e5870SNeilBrown bi->bv_offset = 0; 1618a68e5870SNeilBrown if (size > PAGE_SIZE) 1619a68e5870SNeilBrown bi->bv_len = PAGE_SIZE; 1620a68e5870SNeilBrown else 1621a68e5870SNeilBrown bi->bv_len = size; 1622a68e5870SNeilBrown size -= PAGE_SIZE; 1623a68e5870SNeilBrown memcpy(page_address(bi->bv_page), 1624a68e5870SNeilBrown page_address(pbio->bi_io_vec[j].bv_page), 1625a68e5870SNeilBrown PAGE_SIZE); 1626a68e5870SNeilBrown } 1627a68e5870SNeilBrown } 1628a68e5870SNeilBrown return 0; 1629a68e5870SNeilBrown } 1630a68e5870SNeilBrown 1631a68e5870SNeilBrown static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) 1632a68e5870SNeilBrown { 1633a68e5870SNeilBrown conf_t *conf = mddev->private; 1634a68e5870SNeilBrown int i; 1635a68e5870SNeilBrown int disks = conf->raid_disks; 1636a68e5870SNeilBrown struct bio *bio, *wbio; 1637a68e5870SNeilBrown 1638a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 1639a68e5870SNeilBrown 1640a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 1641a68e5870SNeilBrown /* ouch - failed to read all of that. */ 1642a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 1643a68e5870SNeilBrown return; 16447ca78d57SNeilBrown 16457ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 16467ca78d57SNeilBrown if (process_checks(r1_bio) < 0) 16477ca78d57SNeilBrown return; 1648d11c171eSNeilBrown /* 1649d11c171eSNeilBrown * schedule writes 1650d11c171eSNeilBrown */ 16511da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 16521da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 16531da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 16543e198f78SNeilBrown if (wbio->bi_end_io == NULL || 16553e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 16563e198f78SNeilBrown (i == r1_bio->read_disk || 16573e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 16581da177e4SLinus Torvalds continue; 16591da177e4SLinus Torvalds 16603e198f78SNeilBrown wbio->bi_rw = WRITE; 16613e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 16621da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 16631da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 1664191ea9b2SNeilBrown 16651da177e4SLinus Torvalds generic_make_request(wbio); 16661da177e4SLinus Torvalds } 16671da177e4SLinus Torvalds 16681da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 1669191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 16701da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 1); 16711da177e4SLinus Torvalds put_buf(r1_bio); 16721da177e4SLinus Torvalds } 16731da177e4SLinus Torvalds } 16741da177e4SLinus Torvalds 16751da177e4SLinus Torvalds /* 16761da177e4SLinus Torvalds * This is a kernel thread which: 16771da177e4SLinus Torvalds * 16781da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 16791da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 1680d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 16811da177e4SLinus Torvalds */ 16821da177e4SLinus Torvalds 1683867868fbSNeilBrown static void fix_read_error(conf_t *conf, int read_disk, 1684867868fbSNeilBrown sector_t sect, int sectors) 1685867868fbSNeilBrown { 1686867868fbSNeilBrown mddev_t *mddev = conf->mddev; 1687867868fbSNeilBrown while(sectors) { 1688867868fbSNeilBrown int s = sectors; 1689867868fbSNeilBrown int d = read_disk; 1690867868fbSNeilBrown int success = 0; 1691867868fbSNeilBrown int start; 1692867868fbSNeilBrown mdk_rdev_t *rdev; 1693867868fbSNeilBrown 1694867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 1695867868fbSNeilBrown s = PAGE_SIZE >> 9; 1696867868fbSNeilBrown 1697867868fbSNeilBrown do { 1698867868fbSNeilBrown /* Note: no rcu protection needed here 1699867868fbSNeilBrown * as this is synchronous in the raid1d thread 1700867868fbSNeilBrown * which is the thread that might remove 1701867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 1702867868fbSNeilBrown */ 1703d2eb35acSNeilBrown sector_t first_bad; 1704d2eb35acSNeilBrown int bad_sectors; 1705d2eb35acSNeilBrown 1706867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1707867868fbSNeilBrown if (rdev && 1708867868fbSNeilBrown test_bit(In_sync, &rdev->flags) && 1709d2eb35acSNeilBrown is_badblock(rdev, sect, s, 1710d2eb35acSNeilBrown &first_bad, &bad_sectors) == 0 && 1711ccebd4c4SJonathan Brassow sync_page_io(rdev, sect, s<<9, 1712ccebd4c4SJonathan Brassow conf->tmppage, READ, false)) 1713867868fbSNeilBrown success = 1; 1714867868fbSNeilBrown else { 1715867868fbSNeilBrown d++; 1716867868fbSNeilBrown if (d == conf->raid_disks) 1717867868fbSNeilBrown d = 0; 1718867868fbSNeilBrown } 1719867868fbSNeilBrown } while (!success && d != read_disk); 1720867868fbSNeilBrown 1721867868fbSNeilBrown if (!success) { 1722d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 1723d8f05d29SNeilBrown mdk_rdev_t *rdev = conf->mirrors[read_disk].rdev; 1724d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 1725d8f05d29SNeilBrown md_error(mddev, rdev); 1726867868fbSNeilBrown break; 1727867868fbSNeilBrown } 1728867868fbSNeilBrown /* write it back and re-read */ 1729867868fbSNeilBrown start = d; 1730867868fbSNeilBrown while (d != read_disk) { 1731867868fbSNeilBrown if (d==0) 1732867868fbSNeilBrown d = conf->raid_disks; 1733867868fbSNeilBrown d--; 1734867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1735867868fbSNeilBrown if (rdev && 1736d8f05d29SNeilBrown test_bit(In_sync, &rdev->flags)) 1737d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 1738d8f05d29SNeilBrown conf->tmppage, WRITE); 1739867868fbSNeilBrown } 1740867868fbSNeilBrown d = start; 1741867868fbSNeilBrown while (d != read_disk) { 1742867868fbSNeilBrown char b[BDEVNAME_SIZE]; 1743867868fbSNeilBrown if (d==0) 1744867868fbSNeilBrown d = conf->raid_disks; 1745867868fbSNeilBrown d--; 1746867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 1747867868fbSNeilBrown if (rdev && 1748867868fbSNeilBrown test_bit(In_sync, &rdev->flags)) { 1749d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 1750d8f05d29SNeilBrown conf->tmppage, READ)) { 1751867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 1752867868fbSNeilBrown printk(KERN_INFO 17539dd1e2faSNeilBrown "md/raid1:%s: read error corrected " 1754867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 1755867868fbSNeilBrown mdname(mddev), s, 1756969b755aSRandy Dunlap (unsigned long long)(sect + 1757969b755aSRandy Dunlap rdev->data_offset), 1758867868fbSNeilBrown bdevname(rdev->bdev, b)); 1759867868fbSNeilBrown } 1760867868fbSNeilBrown } 1761867868fbSNeilBrown } 1762867868fbSNeilBrown sectors -= s; 1763867868fbSNeilBrown sect += s; 1764867868fbSNeilBrown } 1765867868fbSNeilBrown } 1766867868fbSNeilBrown 1767cd5ff9a1SNeilBrown static void bi_complete(struct bio *bio, int error) 1768cd5ff9a1SNeilBrown { 1769cd5ff9a1SNeilBrown complete((struct completion *)bio->bi_private); 1770cd5ff9a1SNeilBrown } 1771cd5ff9a1SNeilBrown 1772cd5ff9a1SNeilBrown static int submit_bio_wait(int rw, struct bio *bio) 1773cd5ff9a1SNeilBrown { 1774cd5ff9a1SNeilBrown struct completion event; 1775cd5ff9a1SNeilBrown rw |= REQ_SYNC; 1776cd5ff9a1SNeilBrown 1777cd5ff9a1SNeilBrown init_completion(&event); 1778cd5ff9a1SNeilBrown bio->bi_private = &event; 1779cd5ff9a1SNeilBrown bio->bi_end_io = bi_complete; 1780cd5ff9a1SNeilBrown submit_bio(rw, bio); 1781cd5ff9a1SNeilBrown wait_for_completion(&event); 1782cd5ff9a1SNeilBrown 1783cd5ff9a1SNeilBrown return test_bit(BIO_UPTODATE, &bio->bi_flags); 1784cd5ff9a1SNeilBrown } 1785cd5ff9a1SNeilBrown 1786cd5ff9a1SNeilBrown static int narrow_write_error(r1bio_t *r1_bio, int i) 1787cd5ff9a1SNeilBrown { 1788cd5ff9a1SNeilBrown mddev_t *mddev = r1_bio->mddev; 1789cd5ff9a1SNeilBrown conf_t *conf = mddev->private; 1790cd5ff9a1SNeilBrown mdk_rdev_t *rdev = conf->mirrors[i].rdev; 1791cd5ff9a1SNeilBrown int vcnt, idx; 1792cd5ff9a1SNeilBrown struct bio_vec *vec; 1793cd5ff9a1SNeilBrown 1794cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 1795cd5ff9a1SNeilBrown * we just recently had a write error. 1796cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 1797cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 1798cd5ff9a1SNeilBrown * a bad block. 1799cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 1800cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 1801cd5ff9a1SNeilBrown * 1802cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 1803cd5ff9a1SNeilBrown */ 1804cd5ff9a1SNeilBrown 1805cd5ff9a1SNeilBrown int block_sectors; 1806cd5ff9a1SNeilBrown sector_t sector; 1807cd5ff9a1SNeilBrown int sectors; 1808cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 1809cd5ff9a1SNeilBrown int ok = 1; 1810cd5ff9a1SNeilBrown 1811cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 1812cd5ff9a1SNeilBrown return 0; 1813cd5ff9a1SNeilBrown 1814cd5ff9a1SNeilBrown block_sectors = 1 << rdev->badblocks.shift; 1815cd5ff9a1SNeilBrown sector = r1_bio->sector; 1816cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 1817cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 1818cd5ff9a1SNeilBrown - sector; 1819cd5ff9a1SNeilBrown 1820cd5ff9a1SNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 1821cd5ff9a1SNeilBrown vcnt = r1_bio->behind_page_count; 1822cd5ff9a1SNeilBrown vec = r1_bio->behind_bvecs; 1823cd5ff9a1SNeilBrown idx = 0; 1824cd5ff9a1SNeilBrown while (vec[idx].bv_page == NULL) 1825cd5ff9a1SNeilBrown idx++; 1826cd5ff9a1SNeilBrown } else { 1827cd5ff9a1SNeilBrown vcnt = r1_bio->master_bio->bi_vcnt; 1828cd5ff9a1SNeilBrown vec = r1_bio->master_bio->bi_io_vec; 1829cd5ff9a1SNeilBrown idx = r1_bio->master_bio->bi_idx; 1830cd5ff9a1SNeilBrown } 1831cd5ff9a1SNeilBrown while (sect_to_write) { 1832cd5ff9a1SNeilBrown struct bio *wbio; 1833cd5ff9a1SNeilBrown if (sectors > sect_to_write) 1834cd5ff9a1SNeilBrown sectors = sect_to_write; 1835cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 1836cd5ff9a1SNeilBrown 1837cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 1838cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 1839cd5ff9a1SNeilBrown wbio->bi_sector = r1_bio->sector; 1840cd5ff9a1SNeilBrown wbio->bi_rw = WRITE; 1841cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 1842cd5ff9a1SNeilBrown wbio->bi_size = r1_bio->sectors << 9; 1843cd5ff9a1SNeilBrown wbio->bi_idx = idx; 1844cd5ff9a1SNeilBrown 1845cd5ff9a1SNeilBrown md_trim_bio(wbio, sector - r1_bio->sector, sectors); 1846cd5ff9a1SNeilBrown wbio->bi_sector += rdev->data_offset; 1847cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 1848cd5ff9a1SNeilBrown if (submit_bio_wait(WRITE, wbio) == 0) 1849cd5ff9a1SNeilBrown /* failure! */ 1850cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 1851cd5ff9a1SNeilBrown sectors, 0) 1852cd5ff9a1SNeilBrown && ok; 1853cd5ff9a1SNeilBrown 1854cd5ff9a1SNeilBrown bio_put(wbio); 1855cd5ff9a1SNeilBrown sect_to_write -= sectors; 1856cd5ff9a1SNeilBrown sector += sectors; 1857cd5ff9a1SNeilBrown sectors = block_sectors; 1858cd5ff9a1SNeilBrown } 1859cd5ff9a1SNeilBrown return ok; 1860cd5ff9a1SNeilBrown } 1861cd5ff9a1SNeilBrown 186262096bceSNeilBrown static void handle_sync_write_finished(conf_t *conf, r1bio_t *r1_bio) 186362096bceSNeilBrown { 186462096bceSNeilBrown int m; 186562096bceSNeilBrown int s = r1_bio->sectors; 186662096bceSNeilBrown for (m = 0; m < conf->raid_disks ; m++) { 186762096bceSNeilBrown mdk_rdev_t *rdev = conf->mirrors[m].rdev; 186862096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 186962096bceSNeilBrown if (bio->bi_end_io == NULL) 187062096bceSNeilBrown continue; 187162096bceSNeilBrown if (test_bit(BIO_UPTODATE, &bio->bi_flags) && 187262096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 187362096bceSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s); 187462096bceSNeilBrown } 187562096bceSNeilBrown if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && 187662096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 187762096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 187862096bceSNeilBrown md_error(conf->mddev, rdev); 187962096bceSNeilBrown } 188062096bceSNeilBrown } 188162096bceSNeilBrown put_buf(r1_bio); 188262096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 188362096bceSNeilBrown } 188462096bceSNeilBrown 188562096bceSNeilBrown static void handle_write_finished(conf_t *conf, r1bio_t *r1_bio) 188662096bceSNeilBrown { 188762096bceSNeilBrown int m; 188862096bceSNeilBrown for (m = 0; m < conf->raid_disks ; m++) 188962096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 189062096bceSNeilBrown mdk_rdev_t *rdev = conf->mirrors[m].rdev; 189162096bceSNeilBrown rdev_clear_badblocks(rdev, 189262096bceSNeilBrown r1_bio->sector, 189362096bceSNeilBrown r1_bio->sectors); 189462096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 189562096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 189662096bceSNeilBrown /* This drive got a write error. We need to 189762096bceSNeilBrown * narrow down and record precise write 189862096bceSNeilBrown * errors. 189962096bceSNeilBrown */ 190062096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 190162096bceSNeilBrown md_error(conf->mddev, 190262096bceSNeilBrown conf->mirrors[m].rdev); 190362096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 190462096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 190562096bceSNeilBrown } 190662096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 190762096bceSNeilBrown conf->mddev); 190862096bceSNeilBrown } 190962096bceSNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 191062096bceSNeilBrown close_write(r1_bio); 191162096bceSNeilBrown raid_end_bio_io(r1_bio); 191262096bceSNeilBrown } 191362096bceSNeilBrown 191462096bceSNeilBrown static void handle_read_error(conf_t *conf, r1bio_t *r1_bio) 191562096bceSNeilBrown { 191662096bceSNeilBrown int disk; 191762096bceSNeilBrown int max_sectors; 191862096bceSNeilBrown mddev_t *mddev = conf->mddev; 191962096bceSNeilBrown struct bio *bio; 192062096bceSNeilBrown char b[BDEVNAME_SIZE]; 192162096bceSNeilBrown mdk_rdev_t *rdev; 192262096bceSNeilBrown 192362096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 192462096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 192562096bceSNeilBrown * the block and we can fix it. 192662096bceSNeilBrown * We freeze all other IO, and try reading the block from 192762096bceSNeilBrown * other devices. When we find one, we re-write 192862096bceSNeilBrown * and check it that fixes the read error. 192962096bceSNeilBrown * This is all done synchronously while the array is 193062096bceSNeilBrown * frozen 193162096bceSNeilBrown */ 193262096bceSNeilBrown if (mddev->ro == 0) { 193362096bceSNeilBrown freeze_array(conf); 193462096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 193562096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 193662096bceSNeilBrown unfreeze_array(conf); 193762096bceSNeilBrown } else 193862096bceSNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 193962096bceSNeilBrown 194062096bceSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 194162096bceSNeilBrown bdevname(bio->bi_bdev, b); 194262096bceSNeilBrown read_more: 194362096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 194462096bceSNeilBrown if (disk == -1) { 194562096bceSNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" 194662096bceSNeilBrown " read error for block %llu\n", 194762096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 194862096bceSNeilBrown raid_end_bio_io(r1_bio); 194962096bceSNeilBrown } else { 195062096bceSNeilBrown const unsigned long do_sync 195162096bceSNeilBrown = r1_bio->master_bio->bi_rw & REQ_SYNC; 195262096bceSNeilBrown if (bio) { 195362096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = 195462096bceSNeilBrown mddev->ro ? IO_BLOCKED : NULL; 195562096bceSNeilBrown bio_put(bio); 195662096bceSNeilBrown } 195762096bceSNeilBrown r1_bio->read_disk = disk; 195862096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 195962096bceSNeilBrown md_trim_bio(bio, r1_bio->sector - bio->bi_sector, max_sectors); 196062096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 196162096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 196262096bceSNeilBrown printk_ratelimited(KERN_ERR 196362096bceSNeilBrown "md/raid1:%s: redirecting sector %llu" 196462096bceSNeilBrown " to other mirror: %s\n", 196562096bceSNeilBrown mdname(mddev), 196662096bceSNeilBrown (unsigned long long)r1_bio->sector, 196762096bceSNeilBrown bdevname(rdev->bdev, b)); 196862096bceSNeilBrown bio->bi_sector = r1_bio->sector + rdev->data_offset; 196962096bceSNeilBrown bio->bi_bdev = rdev->bdev; 197062096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 197162096bceSNeilBrown bio->bi_rw = READ | do_sync; 197262096bceSNeilBrown bio->bi_private = r1_bio; 197362096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 197462096bceSNeilBrown /* Drat - have to split this up more */ 197562096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 197662096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 197762096bceSNeilBrown - mbio->bi_sector); 197862096bceSNeilBrown r1_bio->sectors = max_sectors; 197962096bceSNeilBrown spin_lock_irq(&conf->device_lock); 198062096bceSNeilBrown if (mbio->bi_phys_segments == 0) 198162096bceSNeilBrown mbio->bi_phys_segments = 2; 198262096bceSNeilBrown else 198362096bceSNeilBrown mbio->bi_phys_segments++; 198462096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 198562096bceSNeilBrown generic_make_request(bio); 198662096bceSNeilBrown bio = NULL; 198762096bceSNeilBrown 198862096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 198962096bceSNeilBrown 199062096bceSNeilBrown r1_bio->master_bio = mbio; 199162096bceSNeilBrown r1_bio->sectors = (mbio->bi_size >> 9) 199262096bceSNeilBrown - sectors_handled; 199362096bceSNeilBrown r1_bio->state = 0; 199462096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 199562096bceSNeilBrown r1_bio->mddev = mddev; 199662096bceSNeilBrown r1_bio->sector = mbio->bi_sector + sectors_handled; 199762096bceSNeilBrown 199862096bceSNeilBrown goto read_more; 199962096bceSNeilBrown } else 200062096bceSNeilBrown generic_make_request(bio); 200162096bceSNeilBrown } 200262096bceSNeilBrown } 200362096bceSNeilBrown 20041da177e4SLinus Torvalds static void raid1d(mddev_t *mddev) 20051da177e4SLinus Torvalds { 20061da177e4SLinus Torvalds r1bio_t *r1_bio; 20071da177e4SLinus Torvalds unsigned long flags; 2008070ec55dSNeilBrown conf_t *conf = mddev->private; 20091da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2010e1dfa0a2SNeilBrown struct blk_plug plug; 20111da177e4SLinus Torvalds 20121da177e4SLinus Torvalds md_check_recovery(mddev); 20131da177e4SLinus Torvalds 2014e1dfa0a2SNeilBrown blk_start_plug(&plug); 20151da177e4SLinus Torvalds for (;;) { 2016a35e63efSNeilBrown 2017c3b328acSNeilBrown if (atomic_read(&mddev->plug_cnt) == 0) 20187eaceaccSJens Axboe flush_pending_writes(conf); 2019a35e63efSNeilBrown 20201da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2021a35e63efSNeilBrown if (list_empty(head)) { 2022191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 20231da177e4SLinus Torvalds break; 2024a35e63efSNeilBrown } 20251da177e4SLinus Torvalds r1_bio = list_entry(head->prev, r1bio_t, retry_list); 20261da177e4SLinus Torvalds list_del(head->prev); 2027ddaf22abSNeilBrown conf->nr_queued--; 20281da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 20291da177e4SLinus Torvalds 20301da177e4SLinus Torvalds mddev = r1_bio->mddev; 2031070ec55dSNeilBrown conf = mddev->private; 20324367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2033d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 203462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 203562096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 203662096bceSNeilBrown else 20371da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2038cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 203962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 204062096bceSNeilBrown handle_write_finished(conf, r1_bio); 204162096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 204262096bceSNeilBrown handle_read_error(conf, r1_bio); 2043d2eb35acSNeilBrown else 2044d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2045d2eb35acSNeilBrown * context 2046d2eb35acSNeilBrown */ 2047d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 204862096bceSNeilBrown 20491d9d5241SNeilBrown cond_resched(); 2050de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2051de393cdeSNeilBrown md_check_recovery(mddev); 20521da177e4SLinus Torvalds } 2053e1dfa0a2SNeilBrown blk_finish_plug(&plug); 20541da177e4SLinus Torvalds } 20551da177e4SLinus Torvalds 20561da177e4SLinus Torvalds 20571da177e4SLinus Torvalds static int init_resync(conf_t *conf) 20581da177e4SLinus Torvalds { 20591da177e4SLinus Torvalds int buffs; 20601da177e4SLinus Torvalds 20611da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 20629e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 20631da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 20641da177e4SLinus Torvalds conf->poolinfo); 20651da177e4SLinus Torvalds if (!conf->r1buf_pool) 20661da177e4SLinus Torvalds return -ENOMEM; 20671da177e4SLinus Torvalds conf->next_resync = 0; 20681da177e4SLinus Torvalds return 0; 20691da177e4SLinus Torvalds } 20701da177e4SLinus Torvalds 20711da177e4SLinus Torvalds /* 20721da177e4SLinus Torvalds * perform a "sync" on one "block" 20731da177e4SLinus Torvalds * 20741da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 20751da177e4SLinus Torvalds * requests - conflict with active sync requests. 20761da177e4SLinus Torvalds * 20771da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 20781da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 20791da177e4SLinus Torvalds */ 20801da177e4SLinus Torvalds 208157afd89fSNeilBrown static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) 20821da177e4SLinus Torvalds { 2083070ec55dSNeilBrown conf_t *conf = mddev->private; 20841da177e4SLinus Torvalds r1bio_t *r1_bio; 20851da177e4SLinus Torvalds struct bio *bio; 20861da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 20873e198f78SNeilBrown int disk = -1; 20881da177e4SLinus Torvalds int i; 20893e198f78SNeilBrown int wonly = -1; 20903e198f78SNeilBrown int write_targets = 0, read_targets = 0; 209157dab0bdSNeilBrown sector_t sync_blocks; 2092e3b9703eSNeilBrown int still_degraded = 0; 209306f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 209406f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 20951da177e4SLinus Torvalds 20961da177e4SLinus Torvalds if (!conf->r1buf_pool) 20971da177e4SLinus Torvalds if (init_resync(conf)) 209857afd89fSNeilBrown return 0; 20991da177e4SLinus Torvalds 210058c0fed4SAndre Noll max_sector = mddev->dev_sectors; 21011da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2102191ea9b2SNeilBrown /* If we aborted, we need to abort the 2103191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2104191ea9b2SNeilBrown * only be one in raid1 resync. 2105191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2106191ea9b2SNeilBrown */ 21076a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 21086a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2109191ea9b2SNeilBrown &sync_blocks, 1); 21106a806c51SNeilBrown else /* completed sync */ 2111191ea9b2SNeilBrown conf->fullsync = 0; 21126a806c51SNeilBrown 21136a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 21141da177e4SLinus Torvalds close_sync(conf); 21151da177e4SLinus Torvalds return 0; 21161da177e4SLinus Torvalds } 21171da177e4SLinus Torvalds 211807d84d10SNeilBrown if (mddev->bitmap == NULL && 211907d84d10SNeilBrown mddev->recovery_cp == MaxSector && 21206394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 212107d84d10SNeilBrown conf->fullsync == 0) { 212207d84d10SNeilBrown *skipped = 1; 212307d84d10SNeilBrown return max_sector - sector_nr; 212407d84d10SNeilBrown } 21256394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 21266394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 21276394cca5SNeilBrown */ 2128e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2129e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2130191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2131191ea9b2SNeilBrown *skipped = 1; 2132191ea9b2SNeilBrown return sync_blocks; 2133191ea9b2SNeilBrown } 21341da177e4SLinus Torvalds /* 213517999be4SNeilBrown * If there is non-resync activity waiting for a turn, 213617999be4SNeilBrown * and resync is going fast enough, 213717999be4SNeilBrown * then let it though before starting on this new sync request. 21381da177e4SLinus Torvalds */ 213917999be4SNeilBrown if (!go_faster && conf->nr_waiting) 21401da177e4SLinus Torvalds msleep_interruptible(1000); 214117999be4SNeilBrown 2142b47490c9SNeilBrown bitmap_cond_end_sync(mddev->bitmap, sector_nr); 21431c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 214417999be4SNeilBrown raise_barrier(conf); 214517999be4SNeilBrown 214617999be4SNeilBrown conf->next_resync = sector_nr; 21471da177e4SLinus Torvalds 21483e198f78SNeilBrown rcu_read_lock(); 21493e198f78SNeilBrown /* 21503e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 21513e198f78SNeilBrown * we might want to read from a different device. So we 21523e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 21533e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 21543e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 21553e198f78SNeilBrown * is OK. 21563e198f78SNeilBrown */ 21571da177e4SLinus Torvalds 21581da177e4SLinus Torvalds r1_bio->mddev = mddev; 21591da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2160191ea9b2SNeilBrown r1_bio->state = 0; 21611da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 21621da177e4SLinus Torvalds 21631da177e4SLinus Torvalds for (i=0; i < conf->raid_disks; i++) { 21643e198f78SNeilBrown mdk_rdev_t *rdev; 21651da177e4SLinus Torvalds bio = r1_bio->bios[i]; 21661da177e4SLinus Torvalds 21671da177e4SLinus Torvalds /* take from bio_init */ 21681da177e4SLinus Torvalds bio->bi_next = NULL; 2169db8d9d35SNeilBrown bio->bi_flags &= ~(BIO_POOL_MASK-1); 21701da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 2171db8d9d35SNeilBrown bio->bi_comp_cpu = -1; 2172802ba064SNeilBrown bio->bi_rw = READ; 21731da177e4SLinus Torvalds bio->bi_vcnt = 0; 21741da177e4SLinus Torvalds bio->bi_idx = 0; 21751da177e4SLinus Torvalds bio->bi_phys_segments = 0; 21761da177e4SLinus Torvalds bio->bi_size = 0; 21771da177e4SLinus Torvalds bio->bi_end_io = NULL; 21781da177e4SLinus Torvalds bio->bi_private = NULL; 21791da177e4SLinus Torvalds 21803e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 21813e198f78SNeilBrown if (rdev == NULL || 21823e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 2183e3b9703eSNeilBrown still_degraded = 1; 21843e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 21851da177e4SLinus Torvalds bio->bi_rw = WRITE; 21861da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 21871da177e4SLinus Torvalds write_targets ++; 21883e198f78SNeilBrown } else { 21893e198f78SNeilBrown /* may need to read from here */ 219006f60385SNeilBrown sector_t first_bad = MaxSector; 219106f60385SNeilBrown int bad_sectors; 219206f60385SNeilBrown 219306f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 219406f60385SNeilBrown &first_bad, &bad_sectors)) { 219506f60385SNeilBrown if (first_bad > sector_nr) 219606f60385SNeilBrown good_sectors = first_bad - sector_nr; 219706f60385SNeilBrown else { 219806f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 219906f60385SNeilBrown if (min_bad == 0 || 220006f60385SNeilBrown min_bad > bad_sectors) 220106f60385SNeilBrown min_bad = bad_sectors; 220206f60385SNeilBrown } 220306f60385SNeilBrown } 220406f60385SNeilBrown if (sector_nr < first_bad) { 22053e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 22063e198f78SNeilBrown if (wonly < 0) 22073e198f78SNeilBrown wonly = i; 22083e198f78SNeilBrown } else { 22093e198f78SNeilBrown if (disk < 0) 22103e198f78SNeilBrown disk = i; 22113e198f78SNeilBrown } 221206f60385SNeilBrown bio->bi_rw = READ; 221306f60385SNeilBrown bio->bi_end_io = end_sync_read; 22143e198f78SNeilBrown read_targets++; 22153e198f78SNeilBrown } 221606f60385SNeilBrown } 221706f60385SNeilBrown if (bio->bi_end_io) { 22183e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 22193e198f78SNeilBrown bio->bi_sector = sector_nr + rdev->data_offset; 22203e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 22211da177e4SLinus Torvalds bio->bi_private = r1_bio; 22221da177e4SLinus Torvalds } 222306f60385SNeilBrown } 22243e198f78SNeilBrown rcu_read_unlock(); 22253e198f78SNeilBrown if (disk < 0) 22263e198f78SNeilBrown disk = wonly; 22273e198f78SNeilBrown r1_bio->read_disk = disk; 2228191ea9b2SNeilBrown 222906f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 223006f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 223106f60385SNeilBrown * need to mark them bad on all write targets 223206f60385SNeilBrown */ 223306f60385SNeilBrown int ok = 1; 223406f60385SNeilBrown for (i = 0 ; i < conf->raid_disks ; i++) 223506f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 223606f60385SNeilBrown mdk_rdev_t *rdev = 223706f60385SNeilBrown rcu_dereference(conf->mirrors[i].rdev); 223806f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 223906f60385SNeilBrown min_bad, 0 224006f60385SNeilBrown ) && ok; 224106f60385SNeilBrown } 224206f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 224306f60385SNeilBrown *skipped = 1; 224406f60385SNeilBrown put_buf(r1_bio); 224506f60385SNeilBrown 224606f60385SNeilBrown if (!ok) { 224706f60385SNeilBrown /* Cannot record the badblocks, so need to 224806f60385SNeilBrown * abort the resync. 224906f60385SNeilBrown * If there are multiple read targets, could just 225006f60385SNeilBrown * fail the really bad ones ??? 225106f60385SNeilBrown */ 225206f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 225306f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 225406f60385SNeilBrown return 0; 225506f60385SNeilBrown } else 225606f60385SNeilBrown return min_bad; 225706f60385SNeilBrown 225806f60385SNeilBrown } 225906f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 226006f60385SNeilBrown /* only resync enough to reach the next bad->good 226106f60385SNeilBrown * transition */ 226206f60385SNeilBrown good_sectors = min_bad; 226306f60385SNeilBrown } 226406f60385SNeilBrown 22653e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 22663e198f78SNeilBrown /* extra read targets are also write targets */ 22673e198f78SNeilBrown write_targets += read_targets-1; 22683e198f78SNeilBrown 22693e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 22701da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 22711da177e4SLinus Torvalds * drives must be failed - so we are finished 22721da177e4SLinus Torvalds */ 227357afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 227457afd89fSNeilBrown *skipped = 1; 22751da177e4SLinus Torvalds put_buf(r1_bio); 22761da177e4SLinus Torvalds return rv; 22771da177e4SLinus Torvalds } 22781da177e4SLinus Torvalds 2279c6207277SNeilBrown if (max_sector > mddev->resync_max) 2280c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 228106f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 228206f60385SNeilBrown max_sector = sector_nr + good_sectors; 22831da177e4SLinus Torvalds nr_sectors = 0; 2284289e99e8SNeilBrown sync_blocks = 0; 22851da177e4SLinus Torvalds do { 22861da177e4SLinus Torvalds struct page *page; 22871da177e4SLinus Torvalds int len = PAGE_SIZE; 22881da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 22891da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 22901da177e4SLinus Torvalds if (len == 0) 22911da177e4SLinus Torvalds break; 2292ab7a30c7SNeilBrown if (sync_blocks == 0) { 22936a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2294e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2295e5de485fSNeilBrown !conf->fullsync && 2296e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2297191ea9b2SNeilBrown break; 22989e77c485SEric Sesterhenn BUG_ON(sync_blocks < (PAGE_SIZE>>9)); 22997571ae88SNeilBrown if ((len >> 9) > sync_blocks) 23006a806c51SNeilBrown len = sync_blocks<<9; 2301ab7a30c7SNeilBrown } 2302191ea9b2SNeilBrown 23031da177e4SLinus Torvalds for (i=0 ; i < conf->raid_disks; i++) { 23041da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23051da177e4SLinus Torvalds if (bio->bi_end_io) { 2306d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 23071da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 23081da177e4SLinus Torvalds /* stop here */ 2309d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 23101da177e4SLinus Torvalds while (i > 0) { 23111da177e4SLinus Torvalds i--; 23121da177e4SLinus Torvalds bio = r1_bio->bios[i]; 23136a806c51SNeilBrown if (bio->bi_end_io==NULL) 23146a806c51SNeilBrown continue; 23151da177e4SLinus Torvalds /* remove last page from this bio */ 23161da177e4SLinus Torvalds bio->bi_vcnt--; 23171da177e4SLinus Torvalds bio->bi_size -= len; 23181da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 23191da177e4SLinus Torvalds } 23201da177e4SLinus Torvalds goto bio_full; 23211da177e4SLinus Torvalds } 23221da177e4SLinus Torvalds } 23231da177e4SLinus Torvalds } 23241da177e4SLinus Torvalds nr_sectors += len>>9; 23251da177e4SLinus Torvalds sector_nr += len>>9; 2326191ea9b2SNeilBrown sync_blocks -= (len>>9); 23271da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 23281da177e4SLinus Torvalds bio_full: 23291da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 23301da177e4SLinus Torvalds 2331d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2332d11c171eSNeilBrown * compare 2333d11c171eSNeilBrown */ 2334d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2335d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 2336d11c171eSNeilBrown for (i=0; i<conf->raid_disks; i++) { 2337d11c171eSNeilBrown bio = r1_bio->bios[i]; 2338d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 2339ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 23401da177e4SLinus Torvalds generic_make_request(bio); 2341d11c171eSNeilBrown } 2342d11c171eSNeilBrown } 2343d11c171eSNeilBrown } else { 2344d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2345d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2346ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2347d11c171eSNeilBrown generic_make_request(bio); 2348d11c171eSNeilBrown 2349d11c171eSNeilBrown } 23501da177e4SLinus Torvalds return nr_sectors; 23511da177e4SLinus Torvalds } 23521da177e4SLinus Torvalds 235380c3a6ceSDan Williams static sector_t raid1_size(mddev_t *mddev, sector_t sectors, int raid_disks) 235480c3a6ceSDan Williams { 235580c3a6ceSDan Williams if (sectors) 235680c3a6ceSDan Williams return sectors; 235780c3a6ceSDan Williams 235880c3a6ceSDan Williams return mddev->dev_sectors; 235980c3a6ceSDan Williams } 236080c3a6ceSDan Williams 2361709ae487SNeilBrown static conf_t *setup_conf(mddev_t *mddev) 23621da177e4SLinus Torvalds { 23631da177e4SLinus Torvalds conf_t *conf; 2364709ae487SNeilBrown int i; 23651da177e4SLinus Torvalds mirror_info_t *disk; 23661da177e4SLinus Torvalds mdk_rdev_t *rdev; 2367709ae487SNeilBrown int err = -ENOMEM; 23681da177e4SLinus Torvalds 23699ffae0cfSNeilBrown conf = kzalloc(sizeof(conf_t), GFP_KERNEL); 23701da177e4SLinus Torvalds if (!conf) 2371709ae487SNeilBrown goto abort; 23721da177e4SLinus Torvalds 23739ffae0cfSNeilBrown conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks, 23741da177e4SLinus Torvalds GFP_KERNEL); 23751da177e4SLinus Torvalds if (!conf->mirrors) 2376709ae487SNeilBrown goto abort; 23771da177e4SLinus Torvalds 2378ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2379ddaf22abSNeilBrown if (!conf->tmppage) 2380709ae487SNeilBrown goto abort; 2381ddaf22abSNeilBrown 2382709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 23831da177e4SLinus Torvalds if (!conf->poolinfo) 2384709ae487SNeilBrown goto abort; 23851da177e4SLinus Torvalds conf->poolinfo->raid_disks = mddev->raid_disks; 23861da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 23871da177e4SLinus Torvalds r1bio_pool_free, 23881da177e4SLinus Torvalds conf->poolinfo); 23891da177e4SLinus Torvalds if (!conf->r1bio_pool) 2390709ae487SNeilBrown goto abort; 2391709ae487SNeilBrown 2392ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 23931da177e4SLinus Torvalds 2394e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2395159ec1fcSCheng Renquan list_for_each_entry(rdev, &mddev->disks, same_set) { 2396709ae487SNeilBrown int disk_idx = rdev->raid_disk; 23971da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 23981da177e4SLinus Torvalds || disk_idx < 0) 23991da177e4SLinus Torvalds continue; 24001da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 24011da177e4SLinus Torvalds 24021da177e4SLinus Torvalds disk->rdev = rdev; 24031da177e4SLinus Torvalds 24041da177e4SLinus Torvalds disk->head_position = 0; 24051da177e4SLinus Torvalds } 24061da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 24071da177e4SLinus Torvalds conf->mddev = mddev; 24081da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 24091da177e4SLinus Torvalds 24101da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 241117999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 24121da177e4SLinus Torvalds 2413191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 2414191ea9b2SNeilBrown 2415709ae487SNeilBrown conf->last_used = -1; 24161da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 24171da177e4SLinus Torvalds 24181da177e4SLinus Torvalds disk = conf->mirrors + i; 24191da177e4SLinus Torvalds 24205fd6c1dcSNeilBrown if (!disk->rdev || 24215fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 24221da177e4SLinus Torvalds disk->head_position = 0; 2423918f0238SNeilBrown if (disk->rdev) 242417571284SNeilBrown conf->fullsync = 1; 2425709ae487SNeilBrown } else if (conf->last_used < 0) 2426709ae487SNeilBrown /* 2427709ae487SNeilBrown * The first working device is used as a 2428709ae487SNeilBrown * starting point to read balancing. 2429709ae487SNeilBrown */ 2430709ae487SNeilBrown conf->last_used = i; 24311da177e4SLinus Torvalds } 2432709ae487SNeilBrown 2433709ae487SNeilBrown err = -EIO; 2434709ae487SNeilBrown if (conf->last_used < 0) { 24359dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: no operational mirrors\n", 243611ce99e6SNeilBrown mdname(mddev)); 2437709ae487SNeilBrown goto abort; 243811ce99e6SNeilBrown } 2439709ae487SNeilBrown err = -ENOMEM; 2440709ae487SNeilBrown conf->thread = md_register_thread(raid1d, mddev, NULL); 2441709ae487SNeilBrown if (!conf->thread) { 24421da177e4SLinus Torvalds printk(KERN_ERR 24439dd1e2faSNeilBrown "md/raid1:%s: couldn't allocate thread\n", 24441da177e4SLinus Torvalds mdname(mddev)); 2445709ae487SNeilBrown goto abort; 24461da177e4SLinus Torvalds } 2447191ea9b2SNeilBrown 2448709ae487SNeilBrown return conf; 2449709ae487SNeilBrown 2450709ae487SNeilBrown abort: 2451709ae487SNeilBrown if (conf) { 2452709ae487SNeilBrown if (conf->r1bio_pool) 2453709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2454709ae487SNeilBrown kfree(conf->mirrors); 2455709ae487SNeilBrown safe_put_page(conf->tmppage); 2456709ae487SNeilBrown kfree(conf->poolinfo); 2457709ae487SNeilBrown kfree(conf); 2458709ae487SNeilBrown } 2459709ae487SNeilBrown return ERR_PTR(err); 2460709ae487SNeilBrown } 2461709ae487SNeilBrown 2462709ae487SNeilBrown static int run(mddev_t *mddev) 2463709ae487SNeilBrown { 2464709ae487SNeilBrown conf_t *conf; 2465709ae487SNeilBrown int i; 2466709ae487SNeilBrown mdk_rdev_t *rdev; 2467709ae487SNeilBrown 2468709ae487SNeilBrown if (mddev->level != 1) { 24699dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", 2470709ae487SNeilBrown mdname(mddev), mddev->level); 2471709ae487SNeilBrown return -EIO; 2472709ae487SNeilBrown } 2473709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 24749dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", 2475709ae487SNeilBrown mdname(mddev)); 2476709ae487SNeilBrown return -EIO; 2477709ae487SNeilBrown } 2478709ae487SNeilBrown /* 2479709ae487SNeilBrown * copy the already verified devices into our private RAID1 2480709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2481709ae487SNeilBrown * should be freed in stop()] 2482709ae487SNeilBrown */ 2483709ae487SNeilBrown if (mddev->private == NULL) 2484709ae487SNeilBrown conf = setup_conf(mddev); 2485709ae487SNeilBrown else 2486709ae487SNeilBrown conf = mddev->private; 2487709ae487SNeilBrown 2488709ae487SNeilBrown if (IS_ERR(conf)) 2489709ae487SNeilBrown return PTR_ERR(conf); 2490709ae487SNeilBrown 2491709ae487SNeilBrown list_for_each_entry(rdev, &mddev->disks, same_set) { 24921ed7242eSJonathan Brassow if (!mddev->gendisk) 24931ed7242eSJonathan Brassow continue; 2494709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2495709ae487SNeilBrown rdev->data_offset << 9); 2496709ae487SNeilBrown /* as we don't honour merge_bvec_fn, we must never risk 2497627a2d3cSNeilBrown * violating it, so limit ->max_segments to 1 lying within 2498627a2d3cSNeilBrown * a single page, as a one page request is never in violation. 2499709ae487SNeilBrown */ 2500627a2d3cSNeilBrown if (rdev->bdev->bd_disk->queue->merge_bvec_fn) { 2501627a2d3cSNeilBrown blk_queue_max_segments(mddev->queue, 1); 2502627a2d3cSNeilBrown blk_queue_segment_boundary(mddev->queue, 2503627a2d3cSNeilBrown PAGE_CACHE_SIZE - 1); 2504627a2d3cSNeilBrown } 2505709ae487SNeilBrown } 2506709ae487SNeilBrown 2507709ae487SNeilBrown mddev->degraded = 0; 2508709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2509709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2510709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2511709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2512709ae487SNeilBrown mddev->degraded++; 2513709ae487SNeilBrown 2514709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2515709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2516709ae487SNeilBrown 25178c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 25189dd1e2faSNeilBrown printk(KERN_NOTICE "md/raid1:%s: not clean" 25198c6ac868SAndre Noll " -- starting background reconstruction\n", 25208c6ac868SAndre Noll mdname(mddev)); 25211da177e4SLinus Torvalds printk(KERN_INFO 25229dd1e2faSNeilBrown "md/raid1:%s: active with %d out of %d mirrors\n", 25231da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 25241da177e4SLinus Torvalds mddev->raid_disks); 2525709ae487SNeilBrown 25261da177e4SLinus Torvalds /* 25271da177e4SLinus Torvalds * Ok, everything is just fine now 25281da177e4SLinus Torvalds */ 2529709ae487SNeilBrown mddev->thread = conf->thread; 2530709ae487SNeilBrown conf->thread = NULL; 2531709ae487SNeilBrown mddev->private = conf; 2532709ae487SNeilBrown 25331f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 25341da177e4SLinus Torvalds 25351ed7242eSJonathan Brassow if (mddev->queue) { 25360d129228SNeilBrown mddev->queue->backing_dev_info.congested_fn = raid1_congested; 25370d129228SNeilBrown mddev->queue->backing_dev_info.congested_data = mddev; 25381ed7242eSJonathan Brassow } 2539a91a2785SMartin K. Petersen return md_integrity_register(mddev); 25401da177e4SLinus Torvalds } 25411da177e4SLinus Torvalds 25421da177e4SLinus Torvalds static int stop(mddev_t *mddev) 25431da177e4SLinus Torvalds { 2544070ec55dSNeilBrown conf_t *conf = mddev->private; 25454b6d287fSNeilBrown struct bitmap *bitmap = mddev->bitmap; 25464b6d287fSNeilBrown 25474b6d287fSNeilBrown /* wait for behind writes to complete */ 2548e555190dSNeilBrown if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 25499dd1e2faSNeilBrown printk(KERN_INFO "md/raid1:%s: behind writes in progress - waiting to stop.\n", 25509dd1e2faSNeilBrown mdname(mddev)); 25514b6d287fSNeilBrown /* need to kick something here to make sure I/O goes? */ 2552e555190dSNeilBrown wait_event(bitmap->behind_wait, 2553e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 25544b6d287fSNeilBrown } 25551da177e4SLinus Torvalds 2556409c57f3SNeilBrown raise_barrier(conf); 2557409c57f3SNeilBrown lower_barrier(conf); 2558409c57f3SNeilBrown 25591da177e4SLinus Torvalds md_unregister_thread(mddev->thread); 25601da177e4SLinus Torvalds mddev->thread = NULL; 25611da177e4SLinus Torvalds if (conf->r1bio_pool) 25621da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 25631da177e4SLinus Torvalds kfree(conf->mirrors); 25641da177e4SLinus Torvalds kfree(conf->poolinfo); 25651da177e4SLinus Torvalds kfree(conf); 25661da177e4SLinus Torvalds mddev->private = NULL; 25671da177e4SLinus Torvalds return 0; 25681da177e4SLinus Torvalds } 25691da177e4SLinus Torvalds 25701da177e4SLinus Torvalds static int raid1_resize(mddev_t *mddev, sector_t sectors) 25711da177e4SLinus Torvalds { 25721da177e4SLinus Torvalds /* no resync is happening, and there is enough space 25731da177e4SLinus Torvalds * on all devices, so we can resize. 25741da177e4SLinus Torvalds * We need to make sure resync covers any new space. 25751da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 25761da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 25771da177e4SLinus Torvalds * worth it. 25781da177e4SLinus Torvalds */ 25791f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, sectors, 0)); 2580b522adcdSDan Williams if (mddev->array_sectors > raid1_size(mddev, sectors, 0)) 2581b522adcdSDan Williams return -EINVAL; 2582f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 2583449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 2584b522adcdSDan Williams if (sectors > mddev->dev_sectors && 2585b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 258658c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 25871da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 25881da177e4SLinus Torvalds } 2589b522adcdSDan Williams mddev->dev_sectors = sectors; 25904b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 25911da177e4SLinus Torvalds return 0; 25921da177e4SLinus Torvalds } 25931da177e4SLinus Torvalds 259463c70c4fSNeilBrown static int raid1_reshape(mddev_t *mddev) 25951da177e4SLinus Torvalds { 25961da177e4SLinus Torvalds /* We need to: 25971da177e4SLinus Torvalds * 1/ resize the r1bio_pool 25981da177e4SLinus Torvalds * 2/ resize conf->mirrors 25991da177e4SLinus Torvalds * 26001da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 26011da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 26021da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 26036ea9c07cSNeilBrown * 26046ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 26056ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 26061da177e4SLinus Torvalds */ 26071da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 26081da177e4SLinus Torvalds struct pool_info *newpoolinfo; 26091da177e4SLinus Torvalds mirror_info_t *newmirrors; 2610070ec55dSNeilBrown conf_t *conf = mddev->private; 261163c70c4fSNeilBrown int cnt, raid_disks; 2612c04be0aaSNeilBrown unsigned long flags; 2613b5470dc5SDan Williams int d, d2, err; 26141da177e4SLinus Torvalds 261563c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 2616664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 261763c70c4fSNeilBrown mddev->layout != mddev->new_layout || 261863c70c4fSNeilBrown mddev->level != mddev->new_level) { 2619664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 262063c70c4fSNeilBrown mddev->new_layout = mddev->layout; 262163c70c4fSNeilBrown mddev->new_level = mddev->level; 262263c70c4fSNeilBrown return -EINVAL; 262363c70c4fSNeilBrown } 262463c70c4fSNeilBrown 2625b5470dc5SDan Williams err = md_allow_write(mddev); 2626b5470dc5SDan Williams if (err) 2627b5470dc5SDan Williams return err; 26282a2275d6SNeilBrown 262963c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 263063c70c4fSNeilBrown 26316ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 26326ea9c07cSNeilBrown cnt=0; 26336ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 26341da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 26356ea9c07cSNeilBrown cnt++; 26366ea9c07cSNeilBrown if (cnt > raid_disks) 26371da177e4SLinus Torvalds return -EBUSY; 26386ea9c07cSNeilBrown } 26391da177e4SLinus Torvalds 26401da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 26411da177e4SLinus Torvalds if (!newpoolinfo) 26421da177e4SLinus Torvalds return -ENOMEM; 26431da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 26441da177e4SLinus Torvalds newpoolinfo->raid_disks = raid_disks; 26451da177e4SLinus Torvalds 26461da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 26471da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 26481da177e4SLinus Torvalds if (!newpool) { 26491da177e4SLinus Torvalds kfree(newpoolinfo); 26501da177e4SLinus Torvalds return -ENOMEM; 26511da177e4SLinus Torvalds } 26529ffae0cfSNeilBrown newmirrors = kzalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); 26531da177e4SLinus Torvalds if (!newmirrors) { 26541da177e4SLinus Torvalds kfree(newpoolinfo); 26551da177e4SLinus Torvalds mempool_destroy(newpool); 26561da177e4SLinus Torvalds return -ENOMEM; 26571da177e4SLinus Torvalds } 26581da177e4SLinus Torvalds 265917999be4SNeilBrown raise_barrier(conf); 26601da177e4SLinus Torvalds 26611da177e4SLinus Torvalds /* ok, everything is stopped */ 26621da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 26631da177e4SLinus Torvalds conf->r1bio_pool = newpool; 26646ea9c07cSNeilBrown 2665a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 2666a88aa786SNeilBrown mdk_rdev_t *rdev = conf->mirrors[d].rdev; 2667a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 266836fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 2669a88aa786SNeilBrown rdev->raid_disk = d2; 267036fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 267136fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 2672a88aa786SNeilBrown printk(KERN_WARNING 267336fad858SNamhyung Kim "md/raid1:%s: cannot register rd%d\n", 267436fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 2675a88aa786SNeilBrown } 2676a88aa786SNeilBrown if (rdev) 2677a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 26786ea9c07cSNeilBrown } 26791da177e4SLinus Torvalds kfree(conf->mirrors); 26801da177e4SLinus Torvalds conf->mirrors = newmirrors; 26811da177e4SLinus Torvalds kfree(conf->poolinfo); 26821da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 26831da177e4SLinus Torvalds 2684c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 26851da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 2686c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 26871da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 268863c70c4fSNeilBrown mddev->delta_disks = 0; 26891da177e4SLinus Torvalds 26906ea9c07cSNeilBrown conf->last_used = 0; /* just make sure it is in-range */ 269117999be4SNeilBrown lower_barrier(conf); 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 26941da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 26951da177e4SLinus Torvalds 26961da177e4SLinus Torvalds mempool_destroy(oldpool); 26971da177e4SLinus Torvalds return 0; 26981da177e4SLinus Torvalds } 26991da177e4SLinus Torvalds 2700500af87aSNeilBrown static void raid1_quiesce(mddev_t *mddev, int state) 270136fa3063SNeilBrown { 2702070ec55dSNeilBrown conf_t *conf = mddev->private; 270336fa3063SNeilBrown 270436fa3063SNeilBrown switch(state) { 27056eef4b21SNeilBrown case 2: /* wake for suspend */ 27066eef4b21SNeilBrown wake_up(&conf->wait_barrier); 27076eef4b21SNeilBrown break; 27089e6603daSNeilBrown case 1: 270917999be4SNeilBrown raise_barrier(conf); 271036fa3063SNeilBrown break; 27119e6603daSNeilBrown case 0: 271217999be4SNeilBrown lower_barrier(conf); 271336fa3063SNeilBrown break; 271436fa3063SNeilBrown } 271536fa3063SNeilBrown } 271636fa3063SNeilBrown 2717709ae487SNeilBrown static void *raid1_takeover(mddev_t *mddev) 2718709ae487SNeilBrown { 2719709ae487SNeilBrown /* raid1 can take over: 2720709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 2721709ae487SNeilBrown */ 2722709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 2723709ae487SNeilBrown conf_t *conf; 2724709ae487SNeilBrown mddev->new_level = 1; 2725709ae487SNeilBrown mddev->new_layout = 0; 2726709ae487SNeilBrown mddev->new_chunk_sectors = 0; 2727709ae487SNeilBrown conf = setup_conf(mddev); 2728709ae487SNeilBrown if (!IS_ERR(conf)) 2729709ae487SNeilBrown conf->barrier = 1; 2730709ae487SNeilBrown return conf; 2731709ae487SNeilBrown } 2732709ae487SNeilBrown return ERR_PTR(-EINVAL); 2733709ae487SNeilBrown } 27341da177e4SLinus Torvalds 27352604b703SNeilBrown static struct mdk_personality raid1_personality = 27361da177e4SLinus Torvalds { 27371da177e4SLinus Torvalds .name = "raid1", 27382604b703SNeilBrown .level = 1, 27391da177e4SLinus Torvalds .owner = THIS_MODULE, 27401da177e4SLinus Torvalds .make_request = make_request, 27411da177e4SLinus Torvalds .run = run, 27421da177e4SLinus Torvalds .stop = stop, 27431da177e4SLinus Torvalds .status = status, 27441da177e4SLinus Torvalds .error_handler = error, 27451da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 27461da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 27471da177e4SLinus Torvalds .spare_active = raid1_spare_active, 27481da177e4SLinus Torvalds .sync_request = sync_request, 27491da177e4SLinus Torvalds .resize = raid1_resize, 275080c3a6ceSDan Williams .size = raid1_size, 275163c70c4fSNeilBrown .check_reshape = raid1_reshape, 275236fa3063SNeilBrown .quiesce = raid1_quiesce, 2753709ae487SNeilBrown .takeover = raid1_takeover, 27541da177e4SLinus Torvalds }; 27551da177e4SLinus Torvalds 27561da177e4SLinus Torvalds static int __init raid_init(void) 27571da177e4SLinus Torvalds { 27582604b703SNeilBrown return register_md_personality(&raid1_personality); 27591da177e4SLinus Torvalds } 27601da177e4SLinus Torvalds 27611da177e4SLinus Torvalds static void raid_exit(void) 27621da177e4SLinus Torvalds { 27632604b703SNeilBrown unregister_md_personality(&raid1_personality); 27641da177e4SLinus Torvalds } 27651da177e4SLinus Torvalds 27661da177e4SLinus Torvalds module_init(raid_init); 27671da177e4SLinus Torvalds module_exit(raid_exit); 27681da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 27690efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 27701da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 2771d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 27722604b703SNeilBrown MODULE_ALIAS("md-level-1"); 2773