11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * RAID-1 management functions. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 111da177e4SLinus Torvalds * 1296de0e25SJan Engelhardt * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> 131da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> 141da177e4SLinus Torvalds * 15191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support 16191ea9b2SNeilBrown * bitmapped intelligence in resync: 17191ea9b2SNeilBrown * 18191ea9b2SNeilBrown * - bitmap marked during normal i/o 19191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync 20191ea9b2SNeilBrown * 21191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: 22191ea9b2SNeilBrown * - persistent bitmap code 23191ea9b2SNeilBrown * 241da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 251da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 261da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 271da177e4SLinus Torvalds * any later version. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 301da177e4SLinus Torvalds * (for example /usr/src/linux/COPYING); if not, write to the Free 311da177e4SLinus Torvalds * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 345a0e3ad6STejun Heo #include <linux/slab.h> 3525570727SStephen Rothwell #include <linux/delay.h> 36bff61975SNeilBrown #include <linux/blkdev.h> 37056075c7SPaul Gortmaker #include <linux/module.h> 38bff61975SNeilBrown #include <linux/seq_file.h> 398bda470eSChristian Dietrich #include <linux/ratelimit.h> 4043b2e5d8SNeilBrown #include "md.h" 41ef740c37SChristoph Hellwig #include "raid1.h" 42ef740c37SChristoph Hellwig #include "bitmap.h" 43191ea9b2SNeilBrown 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 461da177e4SLinus Torvalds */ 471da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 481da177e4SLinus Torvalds 49473e87ceSJonathan Brassow /* when we get a read error on a read-only array, we redirect to another 50473e87ceSJonathan Brassow * device without failing the first device, or trying to over-write to 51473e87ceSJonathan Brassow * correct the read error. To keep track of bad blocks on a per-bio 52473e87ceSJonathan Brassow * level, we store IO_BLOCKED in the appropriate 'bios' pointer 53473e87ceSJonathan Brassow */ 54473e87ceSJonathan Brassow #define IO_BLOCKED ((struct bio *)1) 55473e87ceSJonathan Brassow /* When we successfully write to a known bad-block, we need to remove the 56473e87ceSJonathan Brassow * bad-block marking which must be done from process context. So we record 57473e87ceSJonathan Brassow * the success by setting devs[n].bio to IO_MADE_GOOD 58473e87ceSJonathan Brassow */ 59473e87ceSJonathan Brassow #define IO_MADE_GOOD ((struct bio *)2) 60473e87ceSJonathan Brassow 61473e87ceSJonathan Brassow #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 62473e87ceSJonathan Brassow 6334db0cd6SNeilBrown /* When there are this many requests queue to be written by 6434db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 6534db0cd6SNeilBrown * for writeback. 6634db0cd6SNeilBrown */ 6734db0cd6SNeilBrown static int max_queued_requests = 1024; 681da177e4SLinus Torvalds 6979ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 7079ef3a8aSmajianpeng sector_t bi_sector); 71e8096360SNeilBrown static void lower_barrier(struct r1conf *conf); 721da177e4SLinus Torvalds 73dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds struct pool_info *pi = data; 769f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 797eaceaccSJens Axboe return kzalloc(size, gfp_flags); 801da177e4SLinus Torvalds } 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds kfree(r1_bio); 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 888e005f7cSmajianpeng #define RESYNC_DEPTH 32 891da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 901da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 918e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 928e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 93c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 94c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 958e005f7cSmajianpeng #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS) 961da177e4SLinus Torvalds 97dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 981da177e4SLinus Torvalds { 991da177e4SLinus Torvalds struct pool_info *pi = data; 1009f2c9d12SNeilBrown struct r1bio *r1_bio; 1011da177e4SLinus Torvalds struct bio *bio; 102da1aab3dSNeilBrown int need_pages; 1031da177e4SLinus Torvalds int i, j; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1067eaceaccSJens Axboe if (!r1_bio) 1071da177e4SLinus Torvalds return NULL; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* 1101da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1111da177e4SLinus Torvalds */ 1121da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1136746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1141da177e4SLinus Torvalds if (!bio) 1151da177e4SLinus Torvalds goto out_free_bio; 1161da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds /* 1191da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 120d11c171eSNeilBrown * the first bio. 121d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 122d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1231da177e4SLinus Torvalds */ 124d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 125da1aab3dSNeilBrown need_pages = pi->raid_disks; 126d11c171eSNeilBrown else 127da1aab3dSNeilBrown need_pages = 1; 128da1aab3dSNeilBrown for (j = 0; j < need_pages; j++) { 129d11c171eSNeilBrown bio = r1_bio->bios[j]; 130a0787606SKent Overstreet bio->bi_vcnt = RESYNC_PAGES; 1311da177e4SLinus Torvalds 132a0787606SKent Overstreet if (bio_alloc_pages(bio, gfp_flags)) 133da1aab3dSNeilBrown goto out_free_pages; 134d11c171eSNeilBrown } 135d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 136d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 137d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 138d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 139d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 140d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 141d11c171eSNeilBrown } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds return r1_bio; 1461da177e4SLinus Torvalds 147da1aab3dSNeilBrown out_free_pages: 148da1aab3dSNeilBrown while (--j >= 0) { 149da1aab3dSNeilBrown struct bio_vec *bv; 150da1aab3dSNeilBrown 151da1aab3dSNeilBrown bio_for_each_segment_all(bv, r1_bio->bios[j], i) 152da1aab3dSNeilBrown __free_page(bv->bv_page); 153da1aab3dSNeilBrown } 154da1aab3dSNeilBrown 1551da177e4SLinus Torvalds out_free_bio: 1561da177e4SLinus Torvalds while (++j < pi->raid_disks) 1571da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1581da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1591da177e4SLinus Torvalds return NULL; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds struct pool_info *pi = data; 165d11c171eSNeilBrown int i,j; 1669f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 1671da177e4SLinus Torvalds 168d11c171eSNeilBrown for (i = 0; i < RESYNC_PAGES; i++) 169d11c171eSNeilBrown for (j = pi->raid_disks; j-- ;) { 170d11c171eSNeilBrown if (j == 0 || 171d11c171eSNeilBrown r1bio->bios[j]->bi_io_vec[i].bv_page != 172d11c171eSNeilBrown r1bio->bios[0]->bi_io_vec[i].bv_page) 1731345b1d8SNeilBrown safe_put_page(r1bio->bios[j]->bi_io_vec[i].bv_page); 1741da177e4SLinus Torvalds } 1751da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1761da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds 181e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds int i; 1841da177e4SLinus Torvalds 1858f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1861da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1874367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 1881da177e4SLinus Torvalds bio_put(*bio); 1891da177e4SLinus Torvalds *bio = NULL; 1901da177e4SLinus Torvalds } 1911da177e4SLinus Torvalds } 1921da177e4SLinus Torvalds 1939f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 1941da177e4SLinus Torvalds { 195e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1981da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 2019f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2021da177e4SLinus Torvalds { 203e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2043e198f78SNeilBrown int i; 2053e198f78SNeilBrown 2068f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2073e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2083e198f78SNeilBrown if (bio->bi_end_io) 2093e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2103e198f78SNeilBrown } 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2131da177e4SLinus Torvalds 21417999be4SNeilBrown lower_barrier(conf); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2179f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds unsigned long flags; 220fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 221e8096360SNeilBrown struct r1conf *conf = mddev->private; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2241da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 225ddaf22abSNeilBrown conf->nr_queued ++; 2261da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2271da177e4SLinus Torvalds 22817999be4SNeilBrown wake_up(&conf->wait_barrier); 2291da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds /* 2331da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2341da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2351da177e4SLinus Torvalds * cache layer. 2361da177e4SLinus Torvalds */ 2379f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 238d2eb35acSNeilBrown { 239d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 240d2eb35acSNeilBrown int done; 241e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 24279ef3a8aSmajianpeng sector_t start_next_window = r1_bio->start_next_window; 2434f024f37SKent Overstreet sector_t bi_sector = bio->bi_iter.bi_sector; 244d2eb35acSNeilBrown 245d2eb35acSNeilBrown if (bio->bi_phys_segments) { 246d2eb35acSNeilBrown unsigned long flags; 247d2eb35acSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 248d2eb35acSNeilBrown bio->bi_phys_segments--; 249d2eb35acSNeilBrown done = (bio->bi_phys_segments == 0); 250d2eb35acSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25179ef3a8aSmajianpeng /* 25279ef3a8aSmajianpeng * make_request() might be waiting for 25379ef3a8aSmajianpeng * bi_phys_segments to decrease 25479ef3a8aSmajianpeng */ 25579ef3a8aSmajianpeng wake_up(&conf->wait_barrier); 256d2eb35acSNeilBrown } else 257d2eb35acSNeilBrown done = 1; 258d2eb35acSNeilBrown 259d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2604246a0b6SChristoph Hellwig bio->bi_error = -EIO; 2614246a0b6SChristoph Hellwig 262d2eb35acSNeilBrown if (done) { 2634246a0b6SChristoph Hellwig bio_endio(bio); 264d2eb35acSNeilBrown /* 265d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 266d2eb35acSNeilBrown * to go idle. 267d2eb35acSNeilBrown */ 26879ef3a8aSmajianpeng allow_barrier(conf, start_next_window, bi_sector); 269d2eb35acSNeilBrown } 270d2eb35acSNeilBrown } 271d2eb35acSNeilBrown 2729f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2731da177e4SLinus Torvalds { 2741da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2751da177e4SLinus Torvalds 2764b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2774b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 27836a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2794b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2804f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 2814f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 2824b6d287fSNeilBrown 283d2eb35acSNeilBrown call_bio_endio(r1_bio); 2844b6d287fSNeilBrown } 2851da177e4SLinus Torvalds free_r1bio(r1_bio); 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* 2891da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2901da177e4SLinus Torvalds */ 2919f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 2921da177e4SLinus Torvalds { 293e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2961da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds 299ba3ae3beSNamhyung Kim /* 300ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 301ba3ae3beSNamhyung Kim */ 3029f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 303ba3ae3beSNamhyung Kim { 304ba3ae3beSNamhyung Kim int mirror; 30530194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 30630194636SNeilBrown int raid_disks = conf->raid_disks; 307ba3ae3beSNamhyung Kim 3088f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 309ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 310ba3ae3beSNamhyung Kim break; 311ba3ae3beSNamhyung Kim 3128f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 313ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 314ba3ae3beSNamhyung Kim 315ba3ae3beSNamhyung Kim return mirror; 316ba3ae3beSNamhyung Kim } 317ba3ae3beSNamhyung Kim 3184246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3191da177e4SLinus Torvalds { 3204246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 3219f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 3221da177e4SLinus Torvalds int mirror; 323e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds mirror = r1_bio->read_disk; 3261da177e4SLinus Torvalds /* 3271da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3281da177e4SLinus Torvalds */ 329ddaf22abSNeilBrown update_head_pos(mirror, r1_bio); 330ddaf22abSNeilBrown 331220946c9SNeilBrown if (uptodate) 3321da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 333dd00a99eSNeilBrown else { 334dd00a99eSNeilBrown /* If all other devices have failed, we want to return 335dd00a99eSNeilBrown * the error upwards rather than fail the last device. 336dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 337dd00a99eSNeilBrown */ 338dd00a99eSNeilBrown unsigned long flags; 339dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 340dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 341dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 34234cab6f4SNeilBrown test_bit(In_sync, &conf->mirrors[mirror].rdev->flags))) 343dd00a99eSNeilBrown uptodate = 1; 344dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 345dd00a99eSNeilBrown } 3461da177e4SLinus Torvalds 3477ad4d4a6SNeilBrown if (uptodate) { 3481da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 3497ad4d4a6SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3507ad4d4a6SNeilBrown } else { 3511da177e4SLinus Torvalds /* 3521da177e4SLinus Torvalds * oops, read error: 3531da177e4SLinus Torvalds */ 3541da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3558bda470eSChristian Dietrich printk_ratelimited( 3568bda470eSChristian Dietrich KERN_ERR "md/raid1:%s: %s: " 3578bda470eSChristian Dietrich "rescheduling sector %llu\n", 3589dd1e2faSNeilBrown mdname(conf->mddev), 3598bda470eSChristian Dietrich bdevname(conf->mirrors[mirror].rdev->bdev, 3608bda470eSChristian Dietrich b), 3618bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 362d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3631da177e4SLinus Torvalds reschedule_retry(r1_bio); 3647ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3689f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3694e78064fSNeilBrown { 3704e78064fSNeilBrown /* it really is the end of this request */ 3714e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3724e78064fSNeilBrown /* free extra copy of the data pages */ 373af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3744e78064fSNeilBrown while (i--) 3752ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3762ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3772ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3784e78064fSNeilBrown } 3794e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3804e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3814e78064fSNeilBrown r1_bio->sectors, 3824e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 383af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3844e78064fSNeilBrown md_write_end(r1_bio->mddev); 385cd5ff9a1SNeilBrown } 386cd5ff9a1SNeilBrown 3879f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 388cd5ff9a1SNeilBrown { 389cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 390cd5ff9a1SNeilBrown return; 391cd5ff9a1SNeilBrown 392cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 393cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 394cd5ff9a1SNeilBrown else { 395cd5ff9a1SNeilBrown close_write(r1_bio); 3964367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3974367af55SNeilBrown reschedule_retry(r1_bio); 3984367af55SNeilBrown else 3994e78064fSNeilBrown raid_end_bio_io(r1_bio); 4004e78064fSNeilBrown } 4014e78064fSNeilBrown } 4024e78064fSNeilBrown 4034246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4041da177e4SLinus Torvalds { 4059f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 406a9701a30SNeilBrown int mirror, behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 407e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 40804b857f7SNeilBrown struct bio *to_put = NULL; 4091da177e4SLinus Torvalds 410ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /* 413e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4141da177e4SLinus Torvalds */ 4154246a0b6SChristoph Hellwig if (bio->bi_error) { 416cd5ff9a1SNeilBrown set_bit(WriteErrorSeen, 417cd5ff9a1SNeilBrown &conf->mirrors[mirror].rdev->flags); 41819d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 41919d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 42019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 42119d67169SNeilBrown conf->mddev->recovery); 42219d67169SNeilBrown 423cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4244367af55SNeilBrown } else { 4251da177e4SLinus Torvalds /* 426e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 427e9c7469bSTejun Heo * will return a good error code for to the higher 428e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 429e9c7469bSTejun Heo * fails. 4301da177e4SLinus Torvalds * 431e9c7469bSTejun Heo * The 'master' represents the composite IO operation 432e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 433e9c7469bSTejun Heo * will wait for the 'master' bio. 4341da177e4SLinus Torvalds */ 4354367af55SNeilBrown sector_t first_bad; 4364367af55SNeilBrown int bad_sectors; 4374367af55SNeilBrown 438cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 439cd5ff9a1SNeilBrown to_put = bio; 4403056e3aeSAlex Lyakas /* 4413056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4423056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4433056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4443056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4453056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4463056e3aeSAlex Lyakas * check this here. 4473056e3aeSAlex Lyakas */ 4483056e3aeSAlex Lyakas if (test_bit(In_sync, &conf->mirrors[mirror].rdev->flags) && 4493056e3aeSAlex Lyakas !test_bit(Faulty, &conf->mirrors[mirror].rdev->flags)) 4501da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4511da177e4SLinus Torvalds 4524367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 4534367af55SNeilBrown if (is_badblock(conf->mirrors[mirror].rdev, 4544367af55SNeilBrown r1_bio->sector, r1_bio->sectors, 4554367af55SNeilBrown &first_bad, &bad_sectors)) { 4564367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4574367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4584367af55SNeilBrown } 4594367af55SNeilBrown } 4604367af55SNeilBrown 4614b6d287fSNeilBrown if (behind) { 4624b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[mirror].rdev->flags)) 4634b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4644b6d287fSNeilBrown 465e9c7469bSTejun Heo /* 466e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 467e9c7469bSTejun Heo * has safely reached all non-writemostly 468e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 469e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 470e9c7469bSTejun Heo * -EIO here, instead we'll wait 471e9c7469bSTejun Heo */ 4724b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4734b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4744b6d287fSNeilBrown /* Maybe we can return now */ 4754b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4764b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 47736a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 47836a4e1feSNeilBrown " %llu-%llu\n", 4794f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 4804f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 481d2eb35acSNeilBrown call_bio_endio(r1_bio); 4824b6d287fSNeilBrown } 4834b6d287fSNeilBrown } 4844b6d287fSNeilBrown } 4854367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 4864367af55SNeilBrown rdev_dec_pending(conf->mirrors[mirror].rdev, 4874367af55SNeilBrown conf->mddev); 488e9c7469bSTejun Heo 4891da177e4SLinus Torvalds /* 4901da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4911da177e4SLinus Torvalds * already. 4921da177e4SLinus Torvalds */ 493af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 494c70810b3SNeilBrown 49504b857f7SNeilBrown if (to_put) 49604b857f7SNeilBrown bio_put(to_put); 4971da177e4SLinus Torvalds } 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* 5001da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5011da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5021da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5031da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5041da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5051da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5061da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5091da177e4SLinus Torvalds * because position is mirror, not device based. 5101da177e4SLinus Torvalds * 5111da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5121da177e4SLinus Torvalds */ 513e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5141da177e4SLinus Torvalds { 515af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 516d2eb35acSNeilBrown int sectors; 517d2eb35acSNeilBrown int best_good_sectors; 5189dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5199dedf603SShaohua Li int has_nonrot_disk; 520be4d3280SShaohua Li int disk; 52176073054SNeilBrown sector_t best_dist; 5229dedf603SShaohua Li unsigned int min_pending; 5233cb03002SNeilBrown struct md_rdev *rdev; 524f3ac8bf7SNeilBrown int choose_first; 52512cee5a8SShaohua Li int choose_next_idle; 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds rcu_read_lock(); 5281da177e4SLinus Torvalds /* 5298ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5301da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5311da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5321da177e4SLinus Torvalds */ 5331da177e4SLinus Torvalds retry: 534d2eb35acSNeilBrown sectors = r1_bio->sectors; 53576073054SNeilBrown best_disk = -1; 5369dedf603SShaohua Li best_dist_disk = -1; 53776073054SNeilBrown best_dist = MaxSector; 5389dedf603SShaohua Li best_pending_disk = -1; 5399dedf603SShaohua Li min_pending = UINT_MAX; 540d2eb35acSNeilBrown best_good_sectors = 0; 5419dedf603SShaohua Li has_nonrot_disk = 0; 54212cee5a8SShaohua Li choose_next_idle = 0; 543d2eb35acSNeilBrown 5447d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 5457d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 54690382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 5477d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 5487d49ffcfSGoldwyn Rodrigues choose_first = 1; 5497d49ffcfSGoldwyn Rodrigues else 5507d49ffcfSGoldwyn Rodrigues choose_first = 0; 5511da177e4SLinus Torvalds 552be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 55376073054SNeilBrown sector_t dist; 554d2eb35acSNeilBrown sector_t first_bad; 555d2eb35acSNeilBrown int bad_sectors; 5569dedf603SShaohua Li unsigned int pending; 55712cee5a8SShaohua Li bool nonrot; 558d2eb35acSNeilBrown 559f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 560f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 561f3ac8bf7SNeilBrown || rdev == NULL 56276073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 563f3ac8bf7SNeilBrown continue; 56476073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 56576073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 56676073054SNeilBrown continue; 56776073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 56876073054SNeilBrown /* Don't balance among write-mostly, just 56976073054SNeilBrown * use the first as a last resort */ 570d1901ef0STomáš Hodek if (best_dist_disk < 0) { 571307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 572307729c8SNeilBrown &first_bad, &bad_sectors)) { 573307729c8SNeilBrown if (first_bad < this_sector) 574307729c8SNeilBrown /* Cannot use this */ 575307729c8SNeilBrown continue; 576307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 577307729c8SNeilBrown } else 578307729c8SNeilBrown best_good_sectors = sectors; 579d1901ef0STomáš Hodek best_dist_disk = disk; 580d1901ef0STomáš Hodek best_pending_disk = disk; 581307729c8SNeilBrown } 58276073054SNeilBrown continue; 5838ddf9efeSNeilBrown } 58476073054SNeilBrown /* This is a reasonable device to use. It might 58576073054SNeilBrown * even be best. 5861da177e4SLinus Torvalds */ 587d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 588d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 589d2eb35acSNeilBrown if (best_dist < MaxSector) 590d2eb35acSNeilBrown /* already have a better device */ 591d2eb35acSNeilBrown continue; 592d2eb35acSNeilBrown if (first_bad <= this_sector) { 593d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 594d2eb35acSNeilBrown * device, then we must not read beyond 595d2eb35acSNeilBrown * bad_sectors from another device.. 596d2eb35acSNeilBrown */ 597d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 598d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 599d2eb35acSNeilBrown sectors = bad_sectors; 600d2eb35acSNeilBrown if (best_good_sectors > sectors) 601d2eb35acSNeilBrown best_good_sectors = sectors; 602d2eb35acSNeilBrown 603d2eb35acSNeilBrown } else { 604d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 605d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 606d2eb35acSNeilBrown best_good_sectors = good_sectors; 607d2eb35acSNeilBrown best_disk = disk; 608d2eb35acSNeilBrown } 609d2eb35acSNeilBrown if (choose_first) 610d2eb35acSNeilBrown break; 611d2eb35acSNeilBrown } 612d2eb35acSNeilBrown continue; 613d2eb35acSNeilBrown } else 614d2eb35acSNeilBrown best_good_sectors = sectors; 615d2eb35acSNeilBrown 61612cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 61712cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6189dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 61976073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 62012cee5a8SShaohua Li if (choose_first) { 62176073054SNeilBrown best_disk = disk; 6221da177e4SLinus Torvalds break; 6231da177e4SLinus Torvalds } 62412cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 62512cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 62612cee5a8SShaohua Li || dist == 0) { 62712cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 62812cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 62912cee5a8SShaohua Li 63012cee5a8SShaohua Li best_disk = disk; 63112cee5a8SShaohua Li /* 63212cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 63312cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 63412cee5a8SShaohua Li * the idle disk. read_balance could already choose an 63512cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 63612cee5a8SShaohua Li * this disk. This doesn't matter because this disk 63712cee5a8SShaohua Li * will idle, next time it will be utilized after the 63812cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 63912cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 64012cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 64112cee5a8SShaohua Li * small, but not a big deal since when the second disk 64212cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 64312cee5a8SShaohua Li */ 64412cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 64512cee5a8SShaohua Li mirror->seq_start != MaxSector && 64612cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 64712cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 64812cee5a8SShaohua Li mirror->seq_start) { 64912cee5a8SShaohua Li choose_next_idle = 1; 65012cee5a8SShaohua Li continue; 65112cee5a8SShaohua Li } 65212cee5a8SShaohua Li break; 65312cee5a8SShaohua Li } 65412cee5a8SShaohua Li /* If device is idle, use it */ 65512cee5a8SShaohua Li if (pending == 0) { 65612cee5a8SShaohua Li best_disk = disk; 65712cee5a8SShaohua Li break; 65812cee5a8SShaohua Li } 65912cee5a8SShaohua Li 66012cee5a8SShaohua Li if (choose_next_idle) 66112cee5a8SShaohua Li continue; 6629dedf603SShaohua Li 6639dedf603SShaohua Li if (min_pending > pending) { 6649dedf603SShaohua Li min_pending = pending; 6659dedf603SShaohua Li best_pending_disk = disk; 6669dedf603SShaohua Li } 6679dedf603SShaohua Li 66876073054SNeilBrown if (dist < best_dist) { 66976073054SNeilBrown best_dist = dist; 6709dedf603SShaohua Li best_dist_disk = disk; 6711da177e4SLinus Torvalds } 672f3ac8bf7SNeilBrown } 6731da177e4SLinus Torvalds 6749dedf603SShaohua Li /* 6759dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 6769dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 6779dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 6789dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 6799dedf603SShaohua Li */ 6809dedf603SShaohua Li if (best_disk == -1) { 6819dedf603SShaohua Li if (has_nonrot_disk) 6829dedf603SShaohua Li best_disk = best_pending_disk; 6839dedf603SShaohua Li else 6849dedf603SShaohua Li best_disk = best_dist_disk; 6859dedf603SShaohua Li } 6869dedf603SShaohua Li 68776073054SNeilBrown if (best_disk >= 0) { 68876073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 6898ddf9efeSNeilBrown if (!rdev) 6908ddf9efeSNeilBrown goto retry; 6918ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 69276073054SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 6931da177e4SLinus Torvalds /* cannot risk returning a device that failed 6941da177e4SLinus Torvalds * before we inc'ed nr_pending 6951da177e4SLinus Torvalds */ 69603c902e1SNeilBrown rdev_dec_pending(rdev, conf->mddev); 6971da177e4SLinus Torvalds goto retry; 6981da177e4SLinus Torvalds } 699d2eb35acSNeilBrown sectors = best_good_sectors; 70012cee5a8SShaohua Li 70112cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 70212cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 70312cee5a8SShaohua Li 704be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds rcu_read_unlock(); 707d2eb35acSNeilBrown *max_sectors = sectors; 7081da177e4SLinus Torvalds 70976073054SNeilBrown return best_disk; 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7125c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7130d129228SNeilBrown { 714e8096360SNeilBrown struct r1conf *conf = mddev->private; 7150d129228SNeilBrown int i, ret = 0; 7160d129228SNeilBrown 7174452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 71834db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 71934db0cd6SNeilBrown return 1; 72034db0cd6SNeilBrown 7210d129228SNeilBrown rcu_read_lock(); 722f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7233cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7240d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 725165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7260d129228SNeilBrown 7271ed7242eSJonathan Brassow BUG_ON(!q); 7281ed7242eSJonathan Brassow 7290d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7300d129228SNeilBrown * non-congested targets, it can be removed 7310d129228SNeilBrown */ 7324452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 7330d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 7340d129228SNeilBrown else 7350d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 7360d129228SNeilBrown } 7370d129228SNeilBrown } 7380d129228SNeilBrown rcu_read_unlock(); 7390d129228SNeilBrown return ret; 7400d129228SNeilBrown } 7410d129228SNeilBrown 742e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 743a35e63efSNeilBrown { 744a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 745a35e63efSNeilBrown * bitmap updates get flushed here. 746a35e63efSNeilBrown */ 747a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 748a35e63efSNeilBrown 749a35e63efSNeilBrown if (conf->pending_bio_list.head) { 750a35e63efSNeilBrown struct bio *bio; 751a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 75234db0cd6SNeilBrown conf->pending_count = 0; 753a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 754a35e63efSNeilBrown /* flush any pending bitmap writes to 755a35e63efSNeilBrown * disk before proceeding w/ I/O */ 756a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 75734db0cd6SNeilBrown wake_up(&conf->wait_barrier); 758a35e63efSNeilBrown 759a35e63efSNeilBrown while (bio) { /* submit pending writes */ 760a35e63efSNeilBrown struct bio *next = bio->bi_next; 761a35e63efSNeilBrown bio->bi_next = NULL; 7622ff8cc2cSShaohua Li if (unlikely((bio->bi_rw & REQ_DISCARD) && 7632ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 7642ff8cc2cSShaohua Li /* Just ignore it */ 7654246a0b6SChristoph Hellwig bio_endio(bio); 7662ff8cc2cSShaohua Li else 767a35e63efSNeilBrown generic_make_request(bio); 768a35e63efSNeilBrown bio = next; 769a35e63efSNeilBrown } 770a35e63efSNeilBrown } else 771a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 7727eaceaccSJens Axboe } 7737eaceaccSJens Axboe 77417999be4SNeilBrown /* Barriers.... 77517999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 77617999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 77717999be4SNeilBrown * To do this we raise a 'barrier'. 77817999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 77917999be4SNeilBrown * to count how many activities are happening which preclude 78017999be4SNeilBrown * normal IO. 78117999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 78217999be4SNeilBrown * i.e. if nr_pending == 0. 78317999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 78417999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 78517999be4SNeilBrown * is ready, no other operations which require a barrier will start 78617999be4SNeilBrown * until the IO request has had a chance. 78717999be4SNeilBrown * 78817999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 78917999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 79017999be4SNeilBrown * allow_barrier when it has finished its IO. 79117999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 79217999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 79317999be4SNeilBrown * lower_barrier when the particular background IO completes. 7941da177e4SLinus Torvalds */ 795c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 7961da177e4SLinus Torvalds { 7971da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 7981da177e4SLinus Torvalds 79917999be4SNeilBrown /* Wait until no block IO is waiting */ 80017999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 801eed8c02eSLukas Czerner conf->resync_lock); 80217999be4SNeilBrown 80317999be4SNeilBrown /* block any new IO from starting */ 80417999be4SNeilBrown conf->barrier++; 805c2fd4c94SNeilBrown conf->next_resync = sector_nr; 80617999be4SNeilBrown 80779ef3a8aSmajianpeng /* For these conditions we must wait: 80879ef3a8aSmajianpeng * A: while the array is in frozen state 80979ef3a8aSmajianpeng * B: while barrier >= RESYNC_DEPTH, meaning resync reach 81079ef3a8aSmajianpeng * the max count which allowed. 81179ef3a8aSmajianpeng * C: next_resync + RESYNC_SECTORS > start_next_window, meaning 81279ef3a8aSmajianpeng * next resync will reach to the window which normal bios are 81379ef3a8aSmajianpeng * handling. 8142f73d3c5SNeilBrown * D: while there are any active requests in the current window. 81579ef3a8aSmajianpeng */ 81617999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 817b364e3d0Smajianpeng !conf->array_frozen && 81879ef3a8aSmajianpeng conf->barrier < RESYNC_DEPTH && 8192f73d3c5SNeilBrown conf->current_window_requests == 0 && 82079ef3a8aSmajianpeng (conf->start_next_window >= 82179ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS), 822eed8c02eSLukas Czerner conf->resync_lock); 82317999be4SNeilBrown 82434e97f17SNeilBrown conf->nr_pending++; 8251da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8261da177e4SLinus Torvalds } 8271da177e4SLinus Torvalds 828e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 82917999be4SNeilBrown { 83017999be4SNeilBrown unsigned long flags; 831709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 83217999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 83317999be4SNeilBrown conf->barrier--; 83434e97f17SNeilBrown conf->nr_pending--; 83517999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 83617999be4SNeilBrown wake_up(&conf->wait_barrier); 83717999be4SNeilBrown } 83817999be4SNeilBrown 83979ef3a8aSmajianpeng static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio) 84017999be4SNeilBrown { 84179ef3a8aSmajianpeng bool wait = false; 84279ef3a8aSmajianpeng 84379ef3a8aSmajianpeng if (conf->array_frozen || !bio) 84479ef3a8aSmajianpeng wait = true; 84579ef3a8aSmajianpeng else if (conf->barrier && bio_data_dir(bio) == WRITE) { 84623554960SNeilBrown if ((conf->mddev->curr_resync_completed 84779ef3a8aSmajianpeng >= bio_end_sector(bio)) || 84879ef3a8aSmajianpeng (conf->next_resync + NEXT_NORMALIO_DISTANCE 8494f024f37SKent Overstreet <= bio->bi_iter.bi_sector)) 85079ef3a8aSmajianpeng wait = false; 85179ef3a8aSmajianpeng else 85279ef3a8aSmajianpeng wait = true; 85379ef3a8aSmajianpeng } 85479ef3a8aSmajianpeng 85579ef3a8aSmajianpeng return wait; 85679ef3a8aSmajianpeng } 85779ef3a8aSmajianpeng 85879ef3a8aSmajianpeng static sector_t wait_barrier(struct r1conf *conf, struct bio *bio) 85979ef3a8aSmajianpeng { 86079ef3a8aSmajianpeng sector_t sector = 0; 86179ef3a8aSmajianpeng 86217999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 86379ef3a8aSmajianpeng if (need_to_wait_for_sync(conf, bio)) { 86417999be4SNeilBrown conf->nr_waiting++; 865d6b42dcbSNeilBrown /* Wait for the barrier to drop. 866d6b42dcbSNeilBrown * However if there are already pending 867d6b42dcbSNeilBrown * requests (preventing the barrier from 868d6b42dcbSNeilBrown * rising completely), and the 8695965b642SNeilBrown * per-process bio queue isn't empty, 870d6b42dcbSNeilBrown * then don't wait, as we need to empty 8715965b642SNeilBrown * that queue to allow conf->start_next_window 8725965b642SNeilBrown * to increase. 873d6b42dcbSNeilBrown */ 874d6b42dcbSNeilBrown wait_event_lock_irq(conf->wait_barrier, 875b364e3d0Smajianpeng !conf->array_frozen && 876b364e3d0Smajianpeng (!conf->barrier || 87779ef3a8aSmajianpeng ((conf->start_next_window < 87879ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS) && 879d6b42dcbSNeilBrown current->bio_list && 880b364e3d0Smajianpeng !bio_list_empty(current->bio_list))), 881eed8c02eSLukas Czerner conf->resync_lock); 88217999be4SNeilBrown conf->nr_waiting--; 88317999be4SNeilBrown } 88479ef3a8aSmajianpeng 88579ef3a8aSmajianpeng if (bio && bio_data_dir(bio) == WRITE) { 886e8ff8bf0SJes Sorensen if (bio->bi_iter.bi_sector >= conf->next_resync) { 88779ef3a8aSmajianpeng if (conf->start_next_window == MaxSector) 88879ef3a8aSmajianpeng conf->start_next_window = 88979ef3a8aSmajianpeng conf->next_resync + 89079ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 89179ef3a8aSmajianpeng 89279ef3a8aSmajianpeng if ((conf->start_next_window + NEXT_NORMALIO_DISTANCE) 8934f024f37SKent Overstreet <= bio->bi_iter.bi_sector) 89479ef3a8aSmajianpeng conf->next_window_requests++; 89579ef3a8aSmajianpeng else 89679ef3a8aSmajianpeng conf->current_window_requests++; 89779ef3a8aSmajianpeng sector = conf->start_next_window; 89817999be4SNeilBrown } 89941a336e0SNeilBrown } 90017999be4SNeilBrown 90179ef3a8aSmajianpeng conf->nr_pending++; 90279ef3a8aSmajianpeng spin_unlock_irq(&conf->resync_lock); 90379ef3a8aSmajianpeng return sector; 90479ef3a8aSmajianpeng } 90579ef3a8aSmajianpeng 90679ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 90779ef3a8aSmajianpeng sector_t bi_sector) 90817999be4SNeilBrown { 90917999be4SNeilBrown unsigned long flags; 91079ef3a8aSmajianpeng 91117999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 91217999be4SNeilBrown conf->nr_pending--; 91379ef3a8aSmajianpeng if (start_next_window) { 91479ef3a8aSmajianpeng if (start_next_window == conf->start_next_window) { 91579ef3a8aSmajianpeng if (conf->start_next_window + NEXT_NORMALIO_DISTANCE 91679ef3a8aSmajianpeng <= bi_sector) 91779ef3a8aSmajianpeng conf->next_window_requests--; 91879ef3a8aSmajianpeng else 91979ef3a8aSmajianpeng conf->current_window_requests--; 92079ef3a8aSmajianpeng } else 92179ef3a8aSmajianpeng conf->current_window_requests--; 92279ef3a8aSmajianpeng 92379ef3a8aSmajianpeng if (!conf->current_window_requests) { 92479ef3a8aSmajianpeng if (conf->next_window_requests) { 92579ef3a8aSmajianpeng conf->current_window_requests = 92679ef3a8aSmajianpeng conf->next_window_requests; 92779ef3a8aSmajianpeng conf->next_window_requests = 0; 92879ef3a8aSmajianpeng conf->start_next_window += 92979ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 93079ef3a8aSmajianpeng } else 93179ef3a8aSmajianpeng conf->start_next_window = MaxSector; 93279ef3a8aSmajianpeng } 93379ef3a8aSmajianpeng } 93417999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 93517999be4SNeilBrown wake_up(&conf->wait_barrier); 93617999be4SNeilBrown } 93717999be4SNeilBrown 938e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 939ddaf22abSNeilBrown { 940ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 941ddaf22abSNeilBrown * go quite. 942b364e3d0Smajianpeng * We wait until nr_pending match nr_queued+extra 9431c830532SNeilBrown * This is called in the context of one normal IO request 9441c830532SNeilBrown * that has failed. Thus any sync request that might be pending 9451c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 9461c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 947e2d59925SNeilBrown * Thus the number queued (nr_queued) plus this request (extra) 9481c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 9491c830532SNeilBrown * we continue. 950ddaf22abSNeilBrown */ 951ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 952b364e3d0Smajianpeng conf->array_frozen = 1; 953eed8c02eSLukas Czerner wait_event_lock_irq_cmd(conf->wait_barrier, 954e2d59925SNeilBrown conf->nr_pending == conf->nr_queued+extra, 955ddaf22abSNeilBrown conf->resync_lock, 956c3b328acSNeilBrown flush_pending_writes(conf)); 957ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 958ddaf22abSNeilBrown } 959e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 960ddaf22abSNeilBrown { 961ddaf22abSNeilBrown /* reverse the effect of the freeze */ 962ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 963b364e3d0Smajianpeng conf->array_frozen = 0; 964ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 965ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 966ddaf22abSNeilBrown } 967ddaf22abSNeilBrown 9684e78064fSNeilBrown /* duplicate the data pages for behind I/O 9694e78064fSNeilBrown */ 9709f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 9714b6d287fSNeilBrown { 9724b6d287fSNeilBrown int i; 9734b6d287fSNeilBrown struct bio_vec *bvec; 9742ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 9754b6d287fSNeilBrown GFP_NOIO); 9762ca68f5eSNeilBrown if (unlikely(!bvecs)) 977af6d7b76SNeilBrown return; 9784b6d287fSNeilBrown 979cb34e057SKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 9802ca68f5eSNeilBrown bvecs[i] = *bvec; 9812ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 9822ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 9834b6d287fSNeilBrown goto do_sync_io; 9842ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 9854b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 9862ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 9874b6d287fSNeilBrown kunmap(bvec->bv_page); 9884b6d287fSNeilBrown } 9892ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 990af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 991af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 992af6d7b76SNeilBrown return; 9934b6d287fSNeilBrown 9944b6d287fSNeilBrown do_sync_io: 995af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 9962ca68f5eSNeilBrown if (bvecs[i].bv_page) 9972ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 9982ca68f5eSNeilBrown kfree(bvecs); 9994f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 10004f024f37SKent Overstreet bio->bi_iter.bi_size); 10014b6d287fSNeilBrown } 10024b6d287fSNeilBrown 1003f54a9d0eSNeilBrown struct raid1_plug_cb { 1004f54a9d0eSNeilBrown struct blk_plug_cb cb; 1005f54a9d0eSNeilBrown struct bio_list pending; 1006f54a9d0eSNeilBrown int pending_cnt; 1007f54a9d0eSNeilBrown }; 1008f54a9d0eSNeilBrown 1009f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1010f54a9d0eSNeilBrown { 1011f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1012f54a9d0eSNeilBrown cb); 1013f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1014f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1015f54a9d0eSNeilBrown struct bio *bio; 1016f54a9d0eSNeilBrown 1017874807a8SNeilBrown if (from_schedule || current->bio_list) { 1018f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1019f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1020f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1021f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1022ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1023f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1024f54a9d0eSNeilBrown kfree(plug); 1025f54a9d0eSNeilBrown return; 1026f54a9d0eSNeilBrown } 1027f54a9d0eSNeilBrown 1028f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1029f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1030f54a9d0eSNeilBrown bitmap_unplug(mddev->bitmap); 1031f54a9d0eSNeilBrown wake_up(&conf->wait_barrier); 1032f54a9d0eSNeilBrown 1033f54a9d0eSNeilBrown while (bio) { /* submit pending writes */ 1034f54a9d0eSNeilBrown struct bio *next = bio->bi_next; 1035f54a9d0eSNeilBrown bio->bi_next = NULL; 103632f9f570SShaohua Li if (unlikely((bio->bi_rw & REQ_DISCARD) && 103732f9f570SShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 103832f9f570SShaohua Li /* Just ignore it */ 10394246a0b6SChristoph Hellwig bio_endio(bio); 104032f9f570SShaohua Li else 1041f54a9d0eSNeilBrown generic_make_request(bio); 1042f54a9d0eSNeilBrown bio = next; 1043f54a9d0eSNeilBrown } 1044f54a9d0eSNeilBrown kfree(plug); 1045f54a9d0eSNeilBrown } 1046f54a9d0eSNeilBrown 1047849674e4SShaohua Li static void raid1_make_request(struct mddev *mddev, struct bio * bio) 10481da177e4SLinus Torvalds { 1049e8096360SNeilBrown struct r1conf *conf = mddev->private; 10500eaf822cSJonathan Brassow struct raid1_info *mirror; 10519f2c9d12SNeilBrown struct r1bio *r1_bio; 10521da177e4SLinus Torvalds struct bio *read_bio; 10531f68f0c4SNeilBrown int i, disks; 105484255d10SNeilBrown struct bitmap *bitmap; 1055191ea9b2SNeilBrown unsigned long flags; 1056a362357bSJens Axboe const int rw = bio_data_dir(bio); 10572c7d46ecSNeilBrown const unsigned long do_sync = (bio->bi_rw & REQ_SYNC); 1058e9c7469bSTejun Heo const unsigned long do_flush_fua = (bio->bi_rw & (REQ_FLUSH | REQ_FUA)); 10592ff8cc2cSShaohua Li const unsigned long do_discard = (bio->bi_rw 10602ff8cc2cSShaohua Li & (REQ_DISCARD | REQ_SECURE)); 1061c8dc9c65SJoe Lawrence const unsigned long do_same = (bio->bi_rw & REQ_WRITE_SAME); 10623cb03002SNeilBrown struct md_rdev *blocked_rdev; 1063f54a9d0eSNeilBrown struct blk_plug_cb *cb; 1064f54a9d0eSNeilBrown struct raid1_plug_cb *plug = NULL; 10651f68f0c4SNeilBrown int first_clone; 10661f68f0c4SNeilBrown int sectors_handled; 10671f68f0c4SNeilBrown int max_sectors; 106879ef3a8aSmajianpeng sector_t start_next_window; 1069191ea9b2SNeilBrown 10701da177e4SLinus Torvalds /* 10711da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 10721da177e4SLinus Torvalds * thread has put up a bar for new requests. 10731da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 10741da177e4SLinus Torvalds */ 107562de608dSNeilBrown 10763d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 10773d310eb7SNeilBrown 10786eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 1079589a1c49SGoldwyn Rodrigues ((bio_end_sector(bio) > mddev->suspend_lo && 1080589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector < mddev->suspend_hi) || 1081589a1c49SGoldwyn Rodrigues (mddev_is_clustered(mddev) && 108290382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(mddev, WRITE, 108390382ed9SGoldwyn Rodrigues bio->bi_iter.bi_sector, bio_end_sector(bio))))) { 10846eef4b21SNeilBrown /* As the suspend_* range is controlled by 10856eef4b21SNeilBrown * userspace, we want an interruptible 10866eef4b21SNeilBrown * wait. 10876eef4b21SNeilBrown */ 10886eef4b21SNeilBrown DEFINE_WAIT(w); 10896eef4b21SNeilBrown for (;;) { 10906eef4b21SNeilBrown flush_signals(current); 10916eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 10926eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 1093f73a1c7dSKent Overstreet if (bio_end_sector(bio) <= mddev->suspend_lo || 1094589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector >= mddev->suspend_hi || 1095589a1c49SGoldwyn Rodrigues (mddev_is_clustered(mddev) && 109690382ed9SGoldwyn Rodrigues !md_cluster_ops->area_resyncing(mddev, WRITE, 1097589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector, bio_end_sector(bio)))) 10986eef4b21SNeilBrown break; 10996eef4b21SNeilBrown schedule(); 11006eef4b21SNeilBrown } 11016eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 11026eef4b21SNeilBrown } 110362de608dSNeilBrown 110479ef3a8aSmajianpeng start_next_window = wait_barrier(conf, bio); 11051da177e4SLinus Torvalds 110684255d10SNeilBrown bitmap = mddev->bitmap; 110784255d10SNeilBrown 11081da177e4SLinus Torvalds /* 11091da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 11101da177e4SLinus Torvalds * used and no empty request is available. 11111da177e4SLinus Torvalds * 11121da177e4SLinus Torvalds */ 11131da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 11141da177e4SLinus Torvalds 11151da177e4SLinus Torvalds r1_bio->master_bio = bio; 1116aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio); 1117191ea9b2SNeilBrown r1_bio->state = 0; 11181da177e4SLinus Torvalds r1_bio->mddev = mddev; 11194f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector; 11201da177e4SLinus Torvalds 1121d2eb35acSNeilBrown /* We might need to issue multiple reads to different 1122d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 1123d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 1124d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 1125d2eb35acSNeilBrown * will be needed when requests complete. If it is 1126d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 1127d2eb35acSNeilBrown */ 1128d2eb35acSNeilBrown bio->bi_phys_segments = 0; 1129b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 1130d2eb35acSNeilBrown 1131a362357bSJens Axboe if (rw == READ) { 11321da177e4SLinus Torvalds /* 11331da177e4SLinus Torvalds * read balancing logic: 11341da177e4SLinus Torvalds */ 1135d2eb35acSNeilBrown int rdisk; 1136d2eb35acSNeilBrown 1137d2eb35acSNeilBrown read_again: 1138d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds if (rdisk < 0) { 11411da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 11421da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 11435a7bbad2SChristoph Hellwig return; 11441da177e4SLinus Torvalds } 11451da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 11461da177e4SLinus Torvalds 1147e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1148e555190dSNeilBrown bitmap) { 1149e555190dSNeilBrown /* Reading from a write-mostly device must 1150e555190dSNeilBrown * take care not to over-take any writes 1151e555190dSNeilBrown * that are 'behind' 1152e555190dSNeilBrown */ 1153e555190dSNeilBrown wait_event(bitmap->behind_wait, 1154e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1155e555190dSNeilBrown } 11561da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 1157f0cc9a05SNeilBrown r1_bio->start_next_window = 0; 11581da177e4SLinus Torvalds 1159a167f663SNeilBrown read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); 11604f024f37SKent Overstreet bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector, 1161d2eb35acSNeilBrown max_sectors); 11621da177e4SLinus Torvalds 11631da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 11641da177e4SLinus Torvalds 11654f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 11664f024f37SKent Overstreet mirror->rdev->data_offset; 11671da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 11681da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 11697b6d91daSChristoph Hellwig read_bio->bi_rw = READ | do_sync; 11701da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 11711da177e4SLinus Torvalds 1172d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 1173d2eb35acSNeilBrown /* could not read all from this device, so we will 1174d2eb35acSNeilBrown * need another r1_bio. 1175d2eb35acSNeilBrown */ 1176d2eb35acSNeilBrown 1177d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 11784f024f37SKent Overstreet - bio->bi_iter.bi_sector); 1179d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 1180d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 1181d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 1182d2eb35acSNeilBrown bio->bi_phys_segments = 2; 1183d2eb35acSNeilBrown else 1184d2eb35acSNeilBrown bio->bi_phys_segments++; 1185d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 1186d2eb35acSNeilBrown /* Cannot call generic_make_request directly 1187d2eb35acSNeilBrown * as that will be queued in __make_request 1188d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 1189d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 1190d2eb35acSNeilBrown */ 1191d2eb35acSNeilBrown reschedule_retry(r1_bio); 1192d2eb35acSNeilBrown 1193d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1194d2eb35acSNeilBrown 1195d2eb35acSNeilBrown r1_bio->master_bio = bio; 1196aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 1197d2eb35acSNeilBrown r1_bio->state = 0; 1198d2eb35acSNeilBrown r1_bio->mddev = mddev; 11994f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector + 12004f024f37SKent Overstreet sectors_handled; 1201d2eb35acSNeilBrown goto read_again; 1202d2eb35acSNeilBrown } else 12031da177e4SLinus Torvalds generic_make_request(read_bio); 12045a7bbad2SChristoph Hellwig return; 12051da177e4SLinus Torvalds } 12061da177e4SLinus Torvalds 12071da177e4SLinus Torvalds /* 12081da177e4SLinus Torvalds * WRITE: 12091da177e4SLinus Torvalds */ 121034db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 121134db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 121234db0cd6SNeilBrown wait_event(conf->wait_barrier, 121334db0cd6SNeilBrown conf->pending_count < max_queued_requests); 121434db0cd6SNeilBrown } 12151f68f0c4SNeilBrown /* first select target devices under rcu_lock and 12161da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 12171da177e4SLinus Torvalds * bios[x] to bio 12181f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 12191f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 12201f68f0c4SNeilBrown * blocks. 12211f68f0c4SNeilBrown * This potentially requires several writes to write around 12221f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 12231f68f0c4SNeilBrown * with a set of bios attached. 12241da177e4SLinus Torvalds */ 1225c3b328acSNeilBrown 12268f19ccb2SNeilBrown disks = conf->raid_disks * 2; 12276bfe0b49SDan Williams retry_write: 122879ef3a8aSmajianpeng r1_bio->start_next_window = start_next_window; 12296bfe0b49SDan Williams blocked_rdev = NULL; 12301da177e4SLinus Torvalds rcu_read_lock(); 12311f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 12321da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 12333cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 12346bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 12356bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 12366bfe0b49SDan Williams blocked_rdev = rdev; 12376bfe0b49SDan Williams break; 12386bfe0b49SDan Williams } 12391da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 12408ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 12418f19ccb2SNeilBrown if (i < conf->raid_disks) 12421f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 12431f68f0c4SNeilBrown continue; 1244964147d5SNeilBrown } 12451f68f0c4SNeilBrown 12461f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 12471f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 12481f68f0c4SNeilBrown sector_t first_bad; 12491f68f0c4SNeilBrown int bad_sectors; 12501f68f0c4SNeilBrown int is_bad; 12511f68f0c4SNeilBrown 12521f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 12531f68f0c4SNeilBrown max_sectors, 12541f68f0c4SNeilBrown &first_bad, &bad_sectors); 12551f68f0c4SNeilBrown if (is_bad < 0) { 12561f68f0c4SNeilBrown /* mustn't write here until the bad block is 12571f68f0c4SNeilBrown * acknowledged*/ 12581f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 12591f68f0c4SNeilBrown blocked_rdev = rdev; 12601f68f0c4SNeilBrown break; 12611f68f0c4SNeilBrown } 12621f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 12631f68f0c4SNeilBrown /* Cannot write here at all */ 12641f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 12651f68f0c4SNeilBrown if (bad_sectors < max_sectors) 12661f68f0c4SNeilBrown /* mustn't write more than bad_sectors 12671f68f0c4SNeilBrown * to other devices yet 12681f68f0c4SNeilBrown */ 12691f68f0c4SNeilBrown max_sectors = bad_sectors; 12701f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 12711f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 12721f68f0c4SNeilBrown * only applies if the disk is 12731f68f0c4SNeilBrown * missing, so it might be re-added, 12741f68f0c4SNeilBrown * and we want to know to recover this 12751f68f0c4SNeilBrown * chunk. 12761f68f0c4SNeilBrown * In this case the device is here, 12771f68f0c4SNeilBrown * and the fact that this chunk is not 12781f68f0c4SNeilBrown * in-sync is recorded in the bad 12791f68f0c4SNeilBrown * block log 12801f68f0c4SNeilBrown */ 12811f68f0c4SNeilBrown continue; 12821f68f0c4SNeilBrown } 12831f68f0c4SNeilBrown if (is_bad) { 12841f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 12851f68f0c4SNeilBrown if (good_sectors < max_sectors) 12861f68f0c4SNeilBrown max_sectors = good_sectors; 12871f68f0c4SNeilBrown } 12881f68f0c4SNeilBrown } 12891f68f0c4SNeilBrown r1_bio->bios[i] = bio; 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds rcu_read_unlock(); 12921da177e4SLinus Torvalds 12936bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 12946bfe0b49SDan Williams /* Wait for this device to become unblocked */ 12956bfe0b49SDan Williams int j; 129679ef3a8aSmajianpeng sector_t old = start_next_window; 12976bfe0b49SDan Williams 12986bfe0b49SDan Williams for (j = 0; j < i; j++) 12996bfe0b49SDan Williams if (r1_bio->bios[j]) 13006bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 13011f68f0c4SNeilBrown r1_bio->state = 0; 13024f024f37SKent Overstreet allow_barrier(conf, start_next_window, bio->bi_iter.bi_sector); 13036bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 130479ef3a8aSmajianpeng start_next_window = wait_barrier(conf, bio); 130579ef3a8aSmajianpeng /* 130679ef3a8aSmajianpeng * We must make sure the multi r1bios of bio have 130779ef3a8aSmajianpeng * the same value of bi_phys_segments 130879ef3a8aSmajianpeng */ 130979ef3a8aSmajianpeng if (bio->bi_phys_segments && old && 131079ef3a8aSmajianpeng old != start_next_window) 131179ef3a8aSmajianpeng /* Wait for the former r1bio(s) to complete */ 131279ef3a8aSmajianpeng wait_event(conf->wait_barrier, 131379ef3a8aSmajianpeng bio->bi_phys_segments == 1); 13146bfe0b49SDan Williams goto retry_write; 13156bfe0b49SDan Williams } 13166bfe0b49SDan Williams 13171f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 13181f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 13191f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 13201f68f0c4SNeilBrown */ 13211f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 13221f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 13231f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 13241f68f0c4SNeilBrown bio->bi_phys_segments = 2; 13251f68f0c4SNeilBrown else 13261f68f0c4SNeilBrown bio->bi_phys_segments++; 13271f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1328191ea9b2SNeilBrown } 13294f024f37SKent Overstreet sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; 13304b6d287fSNeilBrown 13314e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 13324b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1333191ea9b2SNeilBrown 13341f68f0c4SNeilBrown first_clone = 1; 13351da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13361da177e4SLinus Torvalds struct bio *mbio; 13371da177e4SLinus Torvalds if (!r1_bio->bios[i]) 13381da177e4SLinus Torvalds continue; 13391da177e4SLinus Torvalds 1340a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 13414f024f37SKent Overstreet bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector, max_sectors); 13421da177e4SLinus Torvalds 13431f68f0c4SNeilBrown if (first_clone) { 13441f68f0c4SNeilBrown /* do behind I/O ? 13451f68f0c4SNeilBrown * Not if there are too many, or cannot 13461f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 13471f68f0c4SNeilBrown * is waiting for behind writes to flush */ 13481f68f0c4SNeilBrown if (bitmap && 13491f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 13501f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 13511f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 13521f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 13531da177e4SLinus Torvalds 13541f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 13551f68f0c4SNeilBrown r1_bio->sectors, 13561f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 13571f68f0c4SNeilBrown &r1_bio->state)); 13581f68f0c4SNeilBrown first_clone = 0; 13591f68f0c4SNeilBrown } 13602ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 13614b6d287fSNeilBrown struct bio_vec *bvec; 13624b6d287fSNeilBrown int j; 13634b6d287fSNeilBrown 1364cb34e057SKent Overstreet /* 1365cb34e057SKent Overstreet * We trimmed the bio, so _all is legit 13664b6d287fSNeilBrown */ 1367d74c6d51SKent Overstreet bio_for_each_segment_all(bvec, mbio, j) 13682ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 13694b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 13704b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 13714b6d287fSNeilBrown } 13724b6d287fSNeilBrown 13731f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 13741f68f0c4SNeilBrown 13754f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 13761f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 13771f68f0c4SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 13781f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1379c8dc9c65SJoe Lawrence mbio->bi_rw = 1380c8dc9c65SJoe Lawrence WRITE | do_flush_fua | do_sync | do_discard | do_same; 13811f68f0c4SNeilBrown mbio->bi_private = r1_bio; 13821f68f0c4SNeilBrown 13831da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1384f54a9d0eSNeilBrown 1385f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1386f54a9d0eSNeilBrown if (cb) 1387f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1388f54a9d0eSNeilBrown else 1389f54a9d0eSNeilBrown plug = NULL; 1390191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1391f54a9d0eSNeilBrown if (plug) { 1392f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1393f54a9d0eSNeilBrown plug->pending_cnt++; 1394f54a9d0eSNeilBrown } else { 13954e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 139634db0cd6SNeilBrown conf->pending_count++; 1397f54a9d0eSNeilBrown } 1398191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1399f54a9d0eSNeilBrown if (!plug) 1400b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 14014e78064fSNeilBrown } 1402079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1403079fa166SNeilBrown * as it could result in the bio being freed. 1404079fa166SNeilBrown */ 1405aa8b57aaSKent Overstreet if (sectors_handled < bio_sectors(bio)) { 1406079fa166SNeilBrown r1_bio_write_done(r1_bio); 14071f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 14081f68f0c4SNeilBrown * in bio->bi_phys_segments 14091f68f0c4SNeilBrown */ 14101f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 14111f68f0c4SNeilBrown r1_bio->master_bio = bio; 1412aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 14131f68f0c4SNeilBrown r1_bio->state = 0; 14141f68f0c4SNeilBrown r1_bio->mddev = mddev; 14154f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 14161f68f0c4SNeilBrown goto retry_write; 14171f68f0c4SNeilBrown } 14181f68f0c4SNeilBrown 1419079fa166SNeilBrown r1_bio_write_done(r1_bio); 1420079fa166SNeilBrown 1421079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1422079fa166SNeilBrown wake_up(&conf->wait_barrier); 14231da177e4SLinus Torvalds } 14241da177e4SLinus Torvalds 1425849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 14261da177e4SLinus Torvalds { 1427e8096360SNeilBrown struct r1conf *conf = mddev->private; 14281da177e4SLinus Torvalds int i; 14291da177e4SLinus Torvalds 14301da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 143111ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1432ddac7c7eSNeilBrown rcu_read_lock(); 1433ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 14343cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 14351da177e4SLinus Torvalds seq_printf(seq, "%s", 1436ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1437ddac7c7eSNeilBrown } 1438ddac7c7eSNeilBrown rcu_read_unlock(); 14391da177e4SLinus Torvalds seq_printf(seq, "]"); 14401da177e4SLinus Torvalds } 14411da177e4SLinus Torvalds 1442849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 14431da177e4SLinus Torvalds { 14441da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1445e8096360SNeilBrown struct r1conf *conf = mddev->private; 1446423f04d6SNeilBrown unsigned long flags; 14471da177e4SLinus Torvalds 14481da177e4SLinus Torvalds /* 14491da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 14501da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 14511da177e4SLinus Torvalds * next level up know. 14521da177e4SLinus Torvalds * else mark the drive as failed 14531da177e4SLinus Torvalds */ 1454b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 14554044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 14561da177e4SLinus Torvalds /* 14571da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 14584044ba58SNeilBrown * normal single drive. 14594044ba58SNeilBrown * However don't try a recovery from this drive as 14604044ba58SNeilBrown * it is very likely to fail. 14611da177e4SLinus Torvalds */ 14625389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 14631da177e4SLinus Torvalds return; 14644044ba58SNeilBrown } 1465de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1466c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1467423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 14681da177e4SLinus Torvalds mddev->degraded++; 1469dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 14702446dba0SNeilBrown } else 14712446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1472423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 14731da177e4SLinus Torvalds /* 14741da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 14751da177e4SLinus Torvalds */ 1476dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 1477850b2b42SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 147855ce74d4SNeilBrown set_bit(MD_CHANGE_PENDING, &mddev->flags); 1479067032bcSJoe Perches printk(KERN_ALERT 1480067032bcSJoe Perches "md/raid1:%s: Disk failure on %s, disabling device.\n" 1481067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 14829dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 14839dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 14841da177e4SLinus Torvalds } 14851da177e4SLinus Torvalds 1486e8096360SNeilBrown static void print_conf(struct r1conf *conf) 14871da177e4SLinus Torvalds { 14881da177e4SLinus Torvalds int i; 14891da177e4SLinus Torvalds 14909dd1e2faSNeilBrown printk(KERN_DEBUG "RAID1 conf printout:\n"); 14911da177e4SLinus Torvalds if (!conf) { 14929dd1e2faSNeilBrown printk(KERN_DEBUG "(!conf)\n"); 14931da177e4SLinus Torvalds return; 14941da177e4SLinus Torvalds } 14959dd1e2faSNeilBrown printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 14961da177e4SLinus Torvalds conf->raid_disks); 14971da177e4SLinus Torvalds 1498ddac7c7eSNeilBrown rcu_read_lock(); 14991da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15001da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 15013cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1502ddac7c7eSNeilBrown if (rdev) 15039dd1e2faSNeilBrown printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n", 1504ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1505ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1506ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 15071da177e4SLinus Torvalds } 1508ddac7c7eSNeilBrown rcu_read_unlock(); 15091da177e4SLinus Torvalds } 15101da177e4SLinus Torvalds 1511e8096360SNeilBrown static void close_sync(struct r1conf *conf) 15121da177e4SLinus Torvalds { 151379ef3a8aSmajianpeng wait_barrier(conf, NULL); 151479ef3a8aSmajianpeng allow_barrier(conf, 0, 0); 15151da177e4SLinus Torvalds 15161da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 15171da177e4SLinus Torvalds conf->r1buf_pool = NULL; 151879ef3a8aSmajianpeng 1519669cc7baSNeilBrown spin_lock_irq(&conf->resync_lock); 1520e8ff8bf0SJes Sorensen conf->next_resync = MaxSector - 2 * NEXT_NORMALIO_DISTANCE; 152179ef3a8aSmajianpeng conf->start_next_window = MaxSector; 1522669cc7baSNeilBrown conf->current_window_requests += 1523669cc7baSNeilBrown conf->next_window_requests; 1524669cc7baSNeilBrown conf->next_window_requests = 0; 1525669cc7baSNeilBrown spin_unlock_irq(&conf->resync_lock); 15261da177e4SLinus Torvalds } 15271da177e4SLinus Torvalds 1528fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 15291da177e4SLinus Torvalds { 15301da177e4SLinus Torvalds int i; 1531e8096360SNeilBrown struct r1conf *conf = mddev->private; 15326b965620SNeilBrown int count = 0; 15336b965620SNeilBrown unsigned long flags; 15341da177e4SLinus Torvalds 15351da177e4SLinus Torvalds /* 15361da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1537ddac7c7eSNeilBrown * and mark them readable. 1538ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1539423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1540423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 15411da177e4SLinus Torvalds */ 1542423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 15431da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15443cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 15458c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 15468c7a2c2bSNeilBrown if (repl 15471aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 15488c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 15498c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 15508c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 15518c7a2c2bSNeilBrown /* replacement has just become active */ 15528c7a2c2bSNeilBrown if (!rdev || 15538c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 15548c7a2c2bSNeilBrown count++; 15558c7a2c2bSNeilBrown if (rdev) { 15568c7a2c2bSNeilBrown /* Replaced device not technically 15578c7a2c2bSNeilBrown * faulty, but we need to be sure 15588c7a2c2bSNeilBrown * it gets removed and never re-added 15598c7a2c2bSNeilBrown */ 15608c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 15618c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 15628c7a2c2bSNeilBrown rdev->sysfs_state); 15638c7a2c2bSNeilBrown } 15648c7a2c2bSNeilBrown } 1565ddac7c7eSNeilBrown if (rdev 156661e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1567ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1568c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 15696b965620SNeilBrown count++; 1570654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 15711da177e4SLinus Torvalds } 15721da177e4SLinus Torvalds } 15736b965620SNeilBrown mddev->degraded -= count; 15746b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds print_conf(conf); 15776b965620SNeilBrown return count; 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 1580fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 15811da177e4SLinus Torvalds { 1582e8096360SNeilBrown struct r1conf *conf = mddev->private; 1583199050eaSNeil Brown int err = -EEXIST; 158441158c7eSNeilBrown int mirror = 0; 15850eaf822cSJonathan Brassow struct raid1_info *p; 15866c2fce2eSNeil Brown int first = 0; 158730194636SNeilBrown int last = conf->raid_disks - 1; 15881da177e4SLinus Torvalds 15895389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 15905389042fSNeilBrown return -EBUSY; 15915389042fSNeilBrown 15921501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 15931501efadSDan Williams return -ENXIO; 15941501efadSDan Williams 15956c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 15966c2fce2eSNeil Brown first = last = rdev->raid_disk; 15976c2fce2eSNeil Brown 159870bcecdbSGoldwyn Rodrigues /* 159970bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 160070bcecdbSGoldwyn Rodrigues * if possible. 160170bcecdbSGoldwyn Rodrigues */ 160270bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 160370bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 160470bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 160570bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 160670bcecdbSGoldwyn Rodrigues 16077ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 16087ef449d1SNeilBrown p = conf->mirrors+mirror; 16097ef449d1SNeilBrown if (!p->rdev) { 16101da177e4SLinus Torvalds 16119092c02dSJonathan Brassow if (mddev->gendisk) 16128f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 16138f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds p->head_position = 0; 16161da177e4SLinus Torvalds rdev->raid_disk = mirror; 1617199050eaSNeil Brown err = 0; 16186aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 16196aea114aSNeilBrown * if this was recently any drive of the array 16206aea114aSNeilBrown */ 16216aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 162241158c7eSNeilBrown conf->fullsync = 1; 1623d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 16241da177e4SLinus Torvalds break; 16251da177e4SLinus Torvalds } 16267ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 16277ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 16287ef449d1SNeilBrown /* Add this device as a replacement */ 16297ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 16307ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 16317ef449d1SNeilBrown rdev->raid_disk = mirror; 16327ef449d1SNeilBrown err = 0; 16337ef449d1SNeilBrown conf->fullsync = 1; 16347ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 16357ef449d1SNeilBrown break; 16367ef449d1SNeilBrown } 16377ef449d1SNeilBrown } 16389092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 16392ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 16401da177e4SLinus Torvalds print_conf(conf); 1641199050eaSNeil Brown return err; 16421da177e4SLinus Torvalds } 16431da177e4SLinus Torvalds 1644b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 16451da177e4SLinus Torvalds { 1646e8096360SNeilBrown struct r1conf *conf = mddev->private; 16471da177e4SLinus Torvalds int err = 0; 1648b8321b68SNeilBrown int number = rdev->raid_disk; 16490eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 16501da177e4SLinus Torvalds 1651b014f14cSNeilBrown if (rdev != p->rdev) 1652b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1653b014f14cSNeilBrown 16541da177e4SLinus Torvalds print_conf(conf); 1655b8321b68SNeilBrown if (rdev == p->rdev) { 1656b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 16571da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 16581da177e4SLinus Torvalds err = -EBUSY; 16591da177e4SLinus Torvalds goto abort; 16601da177e4SLinus Torvalds } 1661046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1662dfc70645SNeilBrown * is not possible. 1663dfc70645SNeilBrown */ 1664dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 16655389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1666dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1667dfc70645SNeilBrown err = -EBUSY; 1668dfc70645SNeilBrown goto abort; 1669dfc70645SNeilBrown } 16701da177e4SLinus Torvalds p->rdev = NULL; 1671fbd568a3SPaul E. McKenney synchronize_rcu(); 16721da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 16731da177e4SLinus Torvalds /* lost the race, try later */ 16741da177e4SLinus Torvalds err = -EBUSY; 16751da177e4SLinus Torvalds p->rdev = rdev; 1676ac5e7113SAndre Noll goto abort; 16778c7a2c2bSNeilBrown } else if (conf->mirrors[conf->raid_disks + number].rdev) { 16788c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 16798c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 16808c7a2c2bSNeilBrown * doing this to avoid confusion. 16818c7a2c2bSNeilBrown */ 16828c7a2c2bSNeilBrown struct md_rdev *repl = 16838c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1684e2d59925SNeilBrown freeze_array(conf, 0); 16858c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 16868c7a2c2bSNeilBrown p->rdev = repl; 16878c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1688e2d59925SNeilBrown unfreeze_array(conf); 1689b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 16908c7a2c2bSNeilBrown } else 16918c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1692a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 16931da177e4SLinus Torvalds } 16941da177e4SLinus Torvalds abort: 16951da177e4SLinus Torvalds 16961da177e4SLinus Torvalds print_conf(conf); 16971da177e4SLinus Torvalds return err; 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds 17004246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 17011da177e4SLinus Torvalds { 17029f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 17031da177e4SLinus Torvalds 17040fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1705ba3ae3beSNamhyung Kim 17061da177e4SLinus Torvalds /* 17071da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 17081da177e4SLinus Torvalds * or re-read if the read failed. 17091da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 17101da177e4SLinus Torvalds */ 17114246a0b6SChristoph Hellwig if (!bio->bi_error) 17121da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1713d11c171eSNeilBrown 1714d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 17151da177e4SLinus Torvalds reschedule_retry(r1_bio); 17161da177e4SLinus Torvalds } 17171da177e4SLinus Torvalds 17184246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 17191da177e4SLinus Torvalds { 17204246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 17219f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1722fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1723e8096360SNeilBrown struct r1conf *conf = mddev->private; 17241da177e4SLinus Torvalds int mirror=0; 17254367af55SNeilBrown sector_t first_bad; 17264367af55SNeilBrown int bad_sectors; 17271da177e4SLinus Torvalds 1728ba3ae3beSNamhyung Kim mirror = find_bio_disk(r1_bio, bio); 1729ba3ae3beSNamhyung Kim 17306b1117d5SNeilBrown if (!uptodate) { 173157dab0bdSNeilBrown sector_t sync_blocks = 0; 17326b1117d5SNeilBrown sector_t s = r1_bio->sector; 17336b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 17346b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 17356b1117d5SNeilBrown do { 17365e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 17376b1117d5SNeilBrown &sync_blocks, 1); 17386b1117d5SNeilBrown s += sync_blocks; 17396b1117d5SNeilBrown sectors_to_go -= sync_blocks; 17406b1117d5SNeilBrown } while (sectors_to_go > 0); 1741d8f05d29SNeilBrown set_bit(WriteErrorSeen, 1742d8f05d29SNeilBrown &conf->mirrors[mirror].rdev->flags); 174319d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 174419d67169SNeilBrown &conf->mirrors[mirror].rdev->flags)) 174519d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 174619d67169SNeilBrown mddev->recovery); 1747d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 17484367af55SNeilBrown } else if (is_badblock(conf->mirrors[mirror].rdev, 17494367af55SNeilBrown r1_bio->sector, 17504367af55SNeilBrown r1_bio->sectors, 17513a9f28a5SNeilBrown &first_bad, &bad_sectors) && 17523a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 17533a9f28a5SNeilBrown r1_bio->sector, 17543a9f28a5SNeilBrown r1_bio->sectors, 17553a9f28a5SNeilBrown &first_bad, &bad_sectors) 17563a9f28a5SNeilBrown ) 17574367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1758e3b9703eSNeilBrown 17591da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 17604367af55SNeilBrown int s = r1_bio->sectors; 1761d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1762d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 17634367af55SNeilBrown reschedule_retry(r1_bio); 17644367af55SNeilBrown else { 17651da177e4SLinus Torvalds put_buf(r1_bio); 176673d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 17671da177e4SLinus Torvalds } 17681da177e4SLinus Torvalds } 17694367af55SNeilBrown } 17701da177e4SLinus Torvalds 17713cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1772d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1773d8f05d29SNeilBrown { 1774d8f05d29SNeilBrown if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1775d8f05d29SNeilBrown /* success */ 1776d8f05d29SNeilBrown return 1; 177719d67169SNeilBrown if (rw == WRITE) { 1778d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 177919d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 178019d67169SNeilBrown &rdev->flags)) 178119d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 178219d67169SNeilBrown rdev->mddev->recovery); 178319d67169SNeilBrown } 1784d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1785d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1786d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1787d8f05d29SNeilBrown return 0; 1788d8f05d29SNeilBrown } 1789d8f05d29SNeilBrown 17909f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 17911da177e4SLinus Torvalds { 1792a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 179369382e85SNeilBrown * good data, much like with normal read errors. Only 1794ddac7c7eSNeilBrown * read into the pages we already have so we don't 179569382e85SNeilBrown * need to re-issue the read request. 179669382e85SNeilBrown * We don't need to freeze the array, because being in an 179769382e85SNeilBrown * active sync request, there is no normal IO, and 179869382e85SNeilBrown * no overlapping syncs. 179906f60385SNeilBrown * We don't need to check is_badblock() again as we 180006f60385SNeilBrown * made sure that anything with a bad block in range 180106f60385SNeilBrown * will have bi_end_io clear. 18021da177e4SLinus Torvalds */ 1803fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1804e8096360SNeilBrown struct r1conf *conf = mddev->private; 1805a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 180669382e85SNeilBrown sector_t sect = r1_bio->sector; 180769382e85SNeilBrown int sectors = r1_bio->sectors; 180869382e85SNeilBrown int idx = 0; 180969382e85SNeilBrown 181069382e85SNeilBrown while(sectors) { 181169382e85SNeilBrown int s = sectors; 181269382e85SNeilBrown int d = r1_bio->read_disk; 181369382e85SNeilBrown int success = 0; 18143cb03002SNeilBrown struct md_rdev *rdev; 181578d7f5f7SNeilBrown int start; 181669382e85SNeilBrown 181769382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 181869382e85SNeilBrown s = PAGE_SIZE >> 9; 181969382e85SNeilBrown do { 182069382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1821ddac7c7eSNeilBrown /* No rcu protection needed here devices 1822ddac7c7eSNeilBrown * can only be removed when no resync is 1823ddac7c7eSNeilBrown * active, and resync is currently active 1824ddac7c7eSNeilBrown */ 182569382e85SNeilBrown rdev = conf->mirrors[d].rdev; 18269d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 182769382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1828ccebd4c4SJonathan Brassow READ, false)) { 182969382e85SNeilBrown success = 1; 183069382e85SNeilBrown break; 183169382e85SNeilBrown } 183269382e85SNeilBrown } 183369382e85SNeilBrown d++; 18348f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 183569382e85SNeilBrown d = 0; 183669382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 183769382e85SNeilBrown 183878d7f5f7SNeilBrown if (!success) { 183978d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 18403a9f28a5SNeilBrown int abort = 0; 18413a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 18423a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 18433a9f28a5SNeilBrown * work just disable and interrupt the recovery. 18443a9f28a5SNeilBrown * Don't fail devices as that won't really help. 18453a9f28a5SNeilBrown */ 184678d7f5f7SNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O read error" 184778d7f5f7SNeilBrown " for block %llu\n", 184878d7f5f7SNeilBrown mdname(mddev), 184978d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 185078d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 18518f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 18523a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 18533a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 18543a9f28a5SNeilBrown continue; 18553a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 18563a9f28a5SNeilBrown abort = 1; 18573a9f28a5SNeilBrown } 18583a9f28a5SNeilBrown if (abort) { 1859d890fa2bSNeilBrown conf->recovery_disabled = 1860d890fa2bSNeilBrown mddev->recovery_disabled; 18613a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 186278d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 186378d7f5f7SNeilBrown put_buf(r1_bio); 186478d7f5f7SNeilBrown return 0; 186578d7f5f7SNeilBrown } 18663a9f28a5SNeilBrown /* Try next page */ 18673a9f28a5SNeilBrown sectors -= s; 18683a9f28a5SNeilBrown sect += s; 18693a9f28a5SNeilBrown idx++; 18703a9f28a5SNeilBrown continue; 18713a9f28a5SNeilBrown } 187278d7f5f7SNeilBrown 187378d7f5f7SNeilBrown start = d; 187469382e85SNeilBrown /* write it back and re-read */ 187569382e85SNeilBrown while (d != r1_bio->read_disk) { 187669382e85SNeilBrown if (d == 0) 18778f19ccb2SNeilBrown d = conf->raid_disks * 2; 187869382e85SNeilBrown d--; 187969382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 188069382e85SNeilBrown continue; 188169382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1882d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 188369382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1884d8f05d29SNeilBrown WRITE) == 0) { 188578d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 188678d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 18879d3d8011SNamhyung Kim } 1888097426f6SNeilBrown } 1889097426f6SNeilBrown d = start; 1890097426f6SNeilBrown while (d != r1_bio->read_disk) { 1891097426f6SNeilBrown if (d == 0) 18928f19ccb2SNeilBrown d = conf->raid_disks * 2; 1893097426f6SNeilBrown d--; 1894097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1895097426f6SNeilBrown continue; 1896097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1897d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 189869382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1899d8f05d29SNeilBrown READ) != 0) 19009d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 190169382e85SNeilBrown } 190269382e85SNeilBrown sectors -= s; 190369382e85SNeilBrown sect += s; 190469382e85SNeilBrown idx ++; 190569382e85SNeilBrown } 190678d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 19074246a0b6SChristoph Hellwig bio->bi_error = 0; 1908a68e5870SNeilBrown return 1; 190969382e85SNeilBrown } 1910d11c171eSNeilBrown 1911c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 1912a68e5870SNeilBrown { 1913a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1914a68e5870SNeilBrown * got the block, then there is no hope left. 1915a68e5870SNeilBrown * If we have, then we want to do a comparison 1916a68e5870SNeilBrown * and skip the write if everything is the same. 1917a68e5870SNeilBrown * If any blocks failed to read, then we need to 1918a68e5870SNeilBrown * attempt an over-write 1919a68e5870SNeilBrown */ 1920fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1921e8096360SNeilBrown struct r1conf *conf = mddev->private; 1922a68e5870SNeilBrown int primary; 1923a68e5870SNeilBrown int i; 1924f4380a91Smajianpeng int vcnt; 1925a68e5870SNeilBrown 192630bc9b53SNeilBrown /* Fix variable parts of all bios */ 192730bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 192830bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 192930bc9b53SNeilBrown int j; 193030bc9b53SNeilBrown int size; 19314246a0b6SChristoph Hellwig int error; 193230bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 193330bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 193430bc9b53SNeilBrown continue; 19354246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 19364246a0b6SChristoph Hellwig error = b->bi_error; 193730bc9b53SNeilBrown bio_reset(b); 19384246a0b6SChristoph Hellwig b->bi_error = error; 193930bc9b53SNeilBrown b->bi_vcnt = vcnt; 19404f024f37SKent Overstreet b->bi_iter.bi_size = r1_bio->sectors << 9; 19414f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 194230bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 194330bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 194430bc9b53SNeilBrown b->bi_end_io = end_sync_read; 194530bc9b53SNeilBrown b->bi_private = r1_bio; 194630bc9b53SNeilBrown 19474f024f37SKent Overstreet size = b->bi_iter.bi_size; 194830bc9b53SNeilBrown for (j = 0; j < vcnt ; j++) { 194930bc9b53SNeilBrown struct bio_vec *bi; 195030bc9b53SNeilBrown bi = &b->bi_io_vec[j]; 195130bc9b53SNeilBrown bi->bv_offset = 0; 195230bc9b53SNeilBrown if (size > PAGE_SIZE) 195330bc9b53SNeilBrown bi->bv_len = PAGE_SIZE; 195430bc9b53SNeilBrown else 195530bc9b53SNeilBrown bi->bv_len = size; 195630bc9b53SNeilBrown size -= PAGE_SIZE; 195730bc9b53SNeilBrown } 195830bc9b53SNeilBrown } 19598f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 1960a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 19614246a0b6SChristoph Hellwig !r1_bio->bios[primary]->bi_error) { 1962a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1963a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1964a68e5870SNeilBrown break; 1965a68e5870SNeilBrown } 1966a68e5870SNeilBrown r1_bio->read_disk = primary; 19678f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1968a68e5870SNeilBrown int j; 1969a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1970a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 19714246a0b6SChristoph Hellwig int error = sbio->bi_error; 197278d7f5f7SNeilBrown 19732aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 197478d7f5f7SNeilBrown continue; 19754246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 19764246a0b6SChristoph Hellwig sbio->bi_error = 0; 1977a68e5870SNeilBrown 19784246a0b6SChristoph Hellwig if (!error) { 1979a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1980a68e5870SNeilBrown struct page *p, *s; 1981a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1982a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1983a68e5870SNeilBrown if (memcmp(page_address(p), 1984a68e5870SNeilBrown page_address(s), 19855020ad7dSNeilBrown sbio->bi_io_vec[j].bv_len)) 1986a68e5870SNeilBrown break; 1987a68e5870SNeilBrown } 1988a68e5870SNeilBrown } else 1989a68e5870SNeilBrown j = 0; 1990a68e5870SNeilBrown if (j >= 0) 19917f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 1992a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 19934246a0b6SChristoph Hellwig && !error)) { 199478d7f5f7SNeilBrown /* No need to write to this device. */ 1995a68e5870SNeilBrown sbio->bi_end_io = NULL; 1996a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 199778d7f5f7SNeilBrown continue; 199878d7f5f7SNeilBrown } 1999d3b45c2aSKent Overstreet 2000d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2001a68e5870SNeilBrown } 2002a68e5870SNeilBrown } 2003a68e5870SNeilBrown 20049f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2005a68e5870SNeilBrown { 2006e8096360SNeilBrown struct r1conf *conf = mddev->private; 2007a68e5870SNeilBrown int i; 20088f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2009a68e5870SNeilBrown struct bio *bio, *wbio; 2010a68e5870SNeilBrown 2011a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2012a68e5870SNeilBrown 2013a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2014a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2015a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2016a68e5870SNeilBrown return; 20177ca78d57SNeilBrown 20187ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2019c95e6385SNeilBrown process_checks(r1_bio); 2020c95e6385SNeilBrown 2021d11c171eSNeilBrown /* 2022d11c171eSNeilBrown * schedule writes 2023d11c171eSNeilBrown */ 20241da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 20251da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 20261da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 20273e198f78SNeilBrown if (wbio->bi_end_io == NULL || 20283e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 20293e198f78SNeilBrown (i == r1_bio->read_disk || 20303e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 20311da177e4SLinus Torvalds continue; 20321da177e4SLinus Torvalds 20333e198f78SNeilBrown wbio->bi_rw = WRITE; 20343e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 20351da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2036aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2037191ea9b2SNeilBrown 20381da177e4SLinus Torvalds generic_make_request(wbio); 20391da177e4SLinus Torvalds } 20401da177e4SLinus Torvalds 20411da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2042191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 204358e94ae1SNeilBrown int s = r1_bio->sectors; 204458e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 204558e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 204658e94ae1SNeilBrown reschedule_retry(r1_bio); 204758e94ae1SNeilBrown else { 20481da177e4SLinus Torvalds put_buf(r1_bio); 204958e94ae1SNeilBrown md_done_sync(mddev, s, 1); 205058e94ae1SNeilBrown } 20511da177e4SLinus Torvalds } 20521da177e4SLinus Torvalds } 20531da177e4SLinus Torvalds 20541da177e4SLinus Torvalds /* 20551da177e4SLinus Torvalds * This is a kernel thread which: 20561da177e4SLinus Torvalds * 20571da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 20581da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2059d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 20601da177e4SLinus Torvalds */ 20611da177e4SLinus Torvalds 2062e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2063867868fbSNeilBrown sector_t sect, int sectors) 2064867868fbSNeilBrown { 2065fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2066867868fbSNeilBrown while(sectors) { 2067867868fbSNeilBrown int s = sectors; 2068867868fbSNeilBrown int d = read_disk; 2069867868fbSNeilBrown int success = 0; 2070867868fbSNeilBrown int start; 20713cb03002SNeilBrown struct md_rdev *rdev; 2072867868fbSNeilBrown 2073867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2074867868fbSNeilBrown s = PAGE_SIZE >> 9; 2075867868fbSNeilBrown 2076867868fbSNeilBrown do { 2077867868fbSNeilBrown /* Note: no rcu protection needed here 2078867868fbSNeilBrown * as this is synchronous in the raid1d thread 2079867868fbSNeilBrown * which is the thread that might remove 2080867868fbSNeilBrown * a device. If raid1d ever becomes multi-threaded.... 2081867868fbSNeilBrown */ 2082d2eb35acSNeilBrown sector_t first_bad; 2083d2eb35acSNeilBrown int bad_sectors; 2084d2eb35acSNeilBrown 2085867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 2086867868fbSNeilBrown if (rdev && 2087da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2088da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2089da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2090d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2091d2eb35acSNeilBrown &first_bad, &bad_sectors) == 0 && 2092ccebd4c4SJonathan Brassow sync_page_io(rdev, sect, s<<9, 2093ccebd4c4SJonathan Brassow conf->tmppage, READ, false)) 2094867868fbSNeilBrown success = 1; 2095867868fbSNeilBrown else { 2096867868fbSNeilBrown d++; 20978f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2098867868fbSNeilBrown d = 0; 2099867868fbSNeilBrown } 2100867868fbSNeilBrown } while (!success && d != read_disk); 2101867868fbSNeilBrown 2102867868fbSNeilBrown if (!success) { 2103d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 21043cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2105d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2106d8f05d29SNeilBrown md_error(mddev, rdev); 2107867868fbSNeilBrown break; 2108867868fbSNeilBrown } 2109867868fbSNeilBrown /* write it back and re-read */ 2110867868fbSNeilBrown start = d; 2111867868fbSNeilBrown while (d != read_disk) { 2112867868fbSNeilBrown if (d==0) 21138f19ccb2SNeilBrown d = conf->raid_disks * 2; 2114867868fbSNeilBrown d--; 2115867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 2116867868fbSNeilBrown if (rdev && 2117b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) 2118d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2119d8f05d29SNeilBrown conf->tmppage, WRITE); 2120867868fbSNeilBrown } 2121867868fbSNeilBrown d = start; 2122867868fbSNeilBrown while (d != read_disk) { 2123867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2124867868fbSNeilBrown if (d==0) 21258f19ccb2SNeilBrown d = conf->raid_disks * 2; 2126867868fbSNeilBrown d--; 2127867868fbSNeilBrown rdev = conf->mirrors[d].rdev; 2128867868fbSNeilBrown if (rdev && 2129b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2130d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2131d8f05d29SNeilBrown conf->tmppage, READ)) { 2132867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 2133867868fbSNeilBrown printk(KERN_INFO 21349dd1e2faSNeilBrown "md/raid1:%s: read error corrected " 2135867868fbSNeilBrown "(%d sectors at %llu on %s)\n", 2136867868fbSNeilBrown mdname(mddev), s, 2137969b755aSRandy Dunlap (unsigned long long)(sect + 2138969b755aSRandy Dunlap rdev->data_offset), 2139867868fbSNeilBrown bdevname(rdev->bdev, b)); 2140867868fbSNeilBrown } 2141867868fbSNeilBrown } 2142867868fbSNeilBrown } 2143867868fbSNeilBrown sectors -= s; 2144867868fbSNeilBrown sect += s; 2145867868fbSNeilBrown } 2146867868fbSNeilBrown } 2147867868fbSNeilBrown 21489f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2149cd5ff9a1SNeilBrown { 2150fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2151e8096360SNeilBrown struct r1conf *conf = mddev->private; 21523cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2153cd5ff9a1SNeilBrown 2154cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2155cd5ff9a1SNeilBrown * we just recently had a write error. 2156cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2157cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2158cd5ff9a1SNeilBrown * a bad block. 2159cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2160cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2161cd5ff9a1SNeilBrown * 2162cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2163cd5ff9a1SNeilBrown */ 2164cd5ff9a1SNeilBrown 2165cd5ff9a1SNeilBrown int block_sectors; 2166cd5ff9a1SNeilBrown sector_t sector; 2167cd5ff9a1SNeilBrown int sectors; 2168cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2169cd5ff9a1SNeilBrown int ok = 1; 2170cd5ff9a1SNeilBrown 2171cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2172cd5ff9a1SNeilBrown return 0; 2173cd5ff9a1SNeilBrown 2174ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2175ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2176cd5ff9a1SNeilBrown sector = r1_bio->sector; 2177cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2178cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2179cd5ff9a1SNeilBrown - sector; 2180cd5ff9a1SNeilBrown 2181cd5ff9a1SNeilBrown while (sect_to_write) { 2182cd5ff9a1SNeilBrown struct bio *wbio; 2183cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2184cd5ff9a1SNeilBrown sectors = sect_to_write; 2185cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2186cd5ff9a1SNeilBrown 2187b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2188b783863fSKent Overstreet unsigned vcnt = r1_bio->behind_page_count; 2189b783863fSKent Overstreet struct bio_vec *vec = r1_bio->behind_bvecs; 2190b783863fSKent Overstreet 2191b783863fSKent Overstreet while (!vec->bv_page) { 2192b783863fSKent Overstreet vec++; 2193b783863fSKent Overstreet vcnt--; 2194b783863fSKent Overstreet } 2195b783863fSKent Overstreet 2196cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 2197cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 2198b783863fSKent Overstreet 2199cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 2200b783863fSKent Overstreet } else { 2201b783863fSKent Overstreet wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 2202b783863fSKent Overstreet } 2203b783863fSKent Overstreet 2204b783863fSKent Overstreet wbio->bi_rw = WRITE; 22054f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 22064f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2207cd5ff9a1SNeilBrown 22086678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 22094f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2210cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 2211203d27b0SJes Sorensen if (submit_bio_wait(WRITE, wbio) < 0) 2212cd5ff9a1SNeilBrown /* failure! */ 2213cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2214cd5ff9a1SNeilBrown sectors, 0) 2215cd5ff9a1SNeilBrown && ok; 2216cd5ff9a1SNeilBrown 2217cd5ff9a1SNeilBrown bio_put(wbio); 2218cd5ff9a1SNeilBrown sect_to_write -= sectors; 2219cd5ff9a1SNeilBrown sector += sectors; 2220cd5ff9a1SNeilBrown sectors = block_sectors; 2221cd5ff9a1SNeilBrown } 2222cd5ff9a1SNeilBrown return ok; 2223cd5ff9a1SNeilBrown } 2224cd5ff9a1SNeilBrown 2225e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 222662096bceSNeilBrown { 222762096bceSNeilBrown int m; 222862096bceSNeilBrown int s = r1_bio->sectors; 22298f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 22303cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 223162096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 223262096bceSNeilBrown if (bio->bi_end_io == NULL) 223362096bceSNeilBrown continue; 22344246a0b6SChristoph Hellwig if (!bio->bi_error && 223562096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2236c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 223762096bceSNeilBrown } 22384246a0b6SChristoph Hellwig if (bio->bi_error && 223962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 224062096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 224162096bceSNeilBrown md_error(conf->mddev, rdev); 224262096bceSNeilBrown } 224362096bceSNeilBrown } 224462096bceSNeilBrown put_buf(r1_bio); 224562096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 224662096bceSNeilBrown } 224762096bceSNeilBrown 2248e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 224962096bceSNeilBrown { 225062096bceSNeilBrown int m; 225155ce74d4SNeilBrown bool fail = false; 22528f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 225362096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 22543cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 225562096bceSNeilBrown rdev_clear_badblocks(rdev, 225662096bceSNeilBrown r1_bio->sector, 2257c6563a8cSNeilBrown r1_bio->sectors, 0); 225862096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 225962096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 226062096bceSNeilBrown /* This drive got a write error. We need to 226162096bceSNeilBrown * narrow down and record precise write 226262096bceSNeilBrown * errors. 226362096bceSNeilBrown */ 226455ce74d4SNeilBrown fail = true; 226562096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 226662096bceSNeilBrown md_error(conf->mddev, 226762096bceSNeilBrown conf->mirrors[m].rdev); 226862096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 226962096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 227062096bceSNeilBrown } 227162096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 227262096bceSNeilBrown conf->mddev); 227362096bceSNeilBrown } 227455ce74d4SNeilBrown if (fail) { 227555ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 227655ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2277ccfc7bf1SNate Dailey conf->nr_queued++; 227855ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 227955ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2280bd8688a1SNeilBrown } else { 2281bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2282bd8688a1SNeilBrown close_write(r1_bio); 228362096bceSNeilBrown raid_end_bio_io(r1_bio); 228462096bceSNeilBrown } 2285bd8688a1SNeilBrown } 228662096bceSNeilBrown 2287e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 228862096bceSNeilBrown { 228962096bceSNeilBrown int disk; 229062096bceSNeilBrown int max_sectors; 2291fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 229262096bceSNeilBrown struct bio *bio; 229362096bceSNeilBrown char b[BDEVNAME_SIZE]; 22943cb03002SNeilBrown struct md_rdev *rdev; 229562096bceSNeilBrown 229662096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 229762096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 229862096bceSNeilBrown * the block and we can fix it. 229962096bceSNeilBrown * We freeze all other IO, and try reading the block from 230062096bceSNeilBrown * other devices. When we find one, we re-write 230162096bceSNeilBrown * and check it that fixes the read error. 230262096bceSNeilBrown * This is all done synchronously while the array is 230362096bceSNeilBrown * frozen 230462096bceSNeilBrown */ 230562096bceSNeilBrown if (mddev->ro == 0) { 2306e2d59925SNeilBrown freeze_array(conf, 1); 230762096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 230862096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 230962096bceSNeilBrown unfreeze_array(conf); 231062096bceSNeilBrown } else 231162096bceSNeilBrown md_error(mddev, conf->mirrors[r1_bio->read_disk].rdev); 23127ad4d4a6SNeilBrown rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); 231362096bceSNeilBrown 231462096bceSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 231562096bceSNeilBrown bdevname(bio->bi_bdev, b); 231662096bceSNeilBrown read_more: 231762096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 231862096bceSNeilBrown if (disk == -1) { 231962096bceSNeilBrown printk(KERN_ALERT "md/raid1:%s: %s: unrecoverable I/O" 232062096bceSNeilBrown " read error for block %llu\n", 232162096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 232262096bceSNeilBrown raid_end_bio_io(r1_bio); 232362096bceSNeilBrown } else { 232462096bceSNeilBrown const unsigned long do_sync 232562096bceSNeilBrown = r1_bio->master_bio->bi_rw & REQ_SYNC; 232662096bceSNeilBrown if (bio) { 232762096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = 232862096bceSNeilBrown mddev->ro ? IO_BLOCKED : NULL; 232962096bceSNeilBrown bio_put(bio); 233062096bceSNeilBrown } 233162096bceSNeilBrown r1_bio->read_disk = disk; 233262096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 23334f024f37SKent Overstreet bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, 23344f024f37SKent Overstreet max_sectors); 233562096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 233662096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 233762096bceSNeilBrown printk_ratelimited(KERN_ERR 233862096bceSNeilBrown "md/raid1:%s: redirecting sector %llu" 233962096bceSNeilBrown " to other mirror: %s\n", 234062096bceSNeilBrown mdname(mddev), 234162096bceSNeilBrown (unsigned long long)r1_bio->sector, 234262096bceSNeilBrown bdevname(rdev->bdev, b)); 23434f024f37SKent Overstreet bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; 234462096bceSNeilBrown bio->bi_bdev = rdev->bdev; 234562096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 234662096bceSNeilBrown bio->bi_rw = READ | do_sync; 234762096bceSNeilBrown bio->bi_private = r1_bio; 234862096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 234962096bceSNeilBrown /* Drat - have to split this up more */ 235062096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 235162096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 23524f024f37SKent Overstreet - mbio->bi_iter.bi_sector); 235362096bceSNeilBrown r1_bio->sectors = max_sectors; 235462096bceSNeilBrown spin_lock_irq(&conf->device_lock); 235562096bceSNeilBrown if (mbio->bi_phys_segments == 0) 235662096bceSNeilBrown mbio->bi_phys_segments = 2; 235762096bceSNeilBrown else 235862096bceSNeilBrown mbio->bi_phys_segments++; 235962096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 236062096bceSNeilBrown generic_make_request(bio); 236162096bceSNeilBrown bio = NULL; 236262096bceSNeilBrown 236362096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 236462096bceSNeilBrown 236562096bceSNeilBrown r1_bio->master_bio = mbio; 2366aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(mbio) - sectors_handled; 236762096bceSNeilBrown r1_bio->state = 0; 236862096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 236962096bceSNeilBrown r1_bio->mddev = mddev; 23704f024f37SKent Overstreet r1_bio->sector = mbio->bi_iter.bi_sector + 23714f024f37SKent Overstreet sectors_handled; 237262096bceSNeilBrown 237362096bceSNeilBrown goto read_more; 237462096bceSNeilBrown } else 237562096bceSNeilBrown generic_make_request(bio); 237662096bceSNeilBrown } 237762096bceSNeilBrown } 237862096bceSNeilBrown 23794ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 23801da177e4SLinus Torvalds { 23814ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 23829f2c9d12SNeilBrown struct r1bio *r1_bio; 23831da177e4SLinus Torvalds unsigned long flags; 2384e8096360SNeilBrown struct r1conf *conf = mddev->private; 23851da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2386e1dfa0a2SNeilBrown struct blk_plug plug; 23871da177e4SLinus Torvalds 23881da177e4SLinus Torvalds md_check_recovery(mddev); 23891da177e4SLinus Torvalds 239055ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 239155ce74d4SNeilBrown !test_bit(MD_CHANGE_PENDING, &mddev->flags)) { 239255ce74d4SNeilBrown LIST_HEAD(tmp); 239355ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 239455ce74d4SNeilBrown if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) { 2395ccfc7bf1SNate Dailey while (!list_empty(&conf->bio_end_io_list)) { 2396ccfc7bf1SNate Dailey list_move(conf->bio_end_io_list.prev, &tmp); 2397ccfc7bf1SNate Dailey conf->nr_queued--; 2398ccfc7bf1SNate Dailey } 239955ce74d4SNeilBrown } 240055ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 240155ce74d4SNeilBrown while (!list_empty(&tmp)) { 2402a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2403a452744bSMikulas Patocka retry_list); 240455ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2405bd8688a1SNeilBrown if (mddev->degraded) 2406bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2407bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2408bd8688a1SNeilBrown close_write(r1_bio); 240955ce74d4SNeilBrown raid_end_bio_io(r1_bio); 241055ce74d4SNeilBrown } 241155ce74d4SNeilBrown } 241255ce74d4SNeilBrown 2413e1dfa0a2SNeilBrown blk_start_plug(&plug); 24141da177e4SLinus Torvalds for (;;) { 2415a35e63efSNeilBrown 24167eaceaccSJens Axboe flush_pending_writes(conf); 2417a35e63efSNeilBrown 24181da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2419a35e63efSNeilBrown if (list_empty(head)) { 2420191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 24211da177e4SLinus Torvalds break; 2422a35e63efSNeilBrown } 24239f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 24241da177e4SLinus Torvalds list_del(head->prev); 2425ddaf22abSNeilBrown conf->nr_queued--; 24261da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 24271da177e4SLinus Torvalds 24281da177e4SLinus Torvalds mddev = r1_bio->mddev; 2429070ec55dSNeilBrown conf = mddev->private; 24304367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2431d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 243262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 243362096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 243462096bceSNeilBrown else 24351da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2436cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 243762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 243862096bceSNeilBrown handle_write_finished(conf, r1_bio); 243962096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 244062096bceSNeilBrown handle_read_error(conf, r1_bio); 2441d2eb35acSNeilBrown else 2442d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2443d2eb35acSNeilBrown * context 2444d2eb35acSNeilBrown */ 2445d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 244662096bceSNeilBrown 24471d9d5241SNeilBrown cond_resched(); 2448de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2449de393cdeSNeilBrown md_check_recovery(mddev); 24501da177e4SLinus Torvalds } 2451e1dfa0a2SNeilBrown blk_finish_plug(&plug); 24521da177e4SLinus Torvalds } 24531da177e4SLinus Torvalds 2454e8096360SNeilBrown static int init_resync(struct r1conf *conf) 24551da177e4SLinus Torvalds { 24561da177e4SLinus Torvalds int buffs; 24571da177e4SLinus Torvalds 24581da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 24599e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 24601da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 24611da177e4SLinus Torvalds conf->poolinfo); 24621da177e4SLinus Torvalds if (!conf->r1buf_pool) 24631da177e4SLinus Torvalds return -ENOMEM; 24641da177e4SLinus Torvalds conf->next_resync = 0; 24651da177e4SLinus Torvalds return 0; 24661da177e4SLinus Torvalds } 24671da177e4SLinus Torvalds 24681da177e4SLinus Torvalds /* 24691da177e4SLinus Torvalds * perform a "sync" on one "block" 24701da177e4SLinus Torvalds * 24711da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 24721da177e4SLinus Torvalds * requests - conflict with active sync requests. 24731da177e4SLinus Torvalds * 24741da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 24751da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 24761da177e4SLinus Torvalds */ 24771da177e4SLinus Torvalds 2478849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2479849674e4SShaohua Li int *skipped) 24801da177e4SLinus Torvalds { 2481e8096360SNeilBrown struct r1conf *conf = mddev->private; 24829f2c9d12SNeilBrown struct r1bio *r1_bio; 24831da177e4SLinus Torvalds struct bio *bio; 24841da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 24853e198f78SNeilBrown int disk = -1; 24861da177e4SLinus Torvalds int i; 24873e198f78SNeilBrown int wonly = -1; 24883e198f78SNeilBrown int write_targets = 0, read_targets = 0; 248957dab0bdSNeilBrown sector_t sync_blocks; 2490e3b9703eSNeilBrown int still_degraded = 0; 249106f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 249206f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 24931da177e4SLinus Torvalds 24941da177e4SLinus Torvalds if (!conf->r1buf_pool) 24951da177e4SLinus Torvalds if (init_resync(conf)) 249657afd89fSNeilBrown return 0; 24971da177e4SLinus Torvalds 249858c0fed4SAndre Noll max_sector = mddev->dev_sectors; 24991da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2500191ea9b2SNeilBrown /* If we aborted, we need to abort the 2501191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2502191ea9b2SNeilBrown * only be one in raid1 resync. 2503191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2504191ea9b2SNeilBrown */ 25056a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 25066a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2507191ea9b2SNeilBrown &sync_blocks, 1); 25086a806c51SNeilBrown else /* completed sync */ 2509191ea9b2SNeilBrown conf->fullsync = 0; 25106a806c51SNeilBrown 25116a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 25121da177e4SLinus Torvalds close_sync(conf); 2513c40f341fSGoldwyn Rodrigues 2514c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2515c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2516c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2517c40f341fSGoldwyn Rodrigues } 25181da177e4SLinus Torvalds return 0; 25191da177e4SLinus Torvalds } 25201da177e4SLinus Torvalds 252107d84d10SNeilBrown if (mddev->bitmap == NULL && 252207d84d10SNeilBrown mddev->recovery_cp == MaxSector && 25236394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 252407d84d10SNeilBrown conf->fullsync == 0) { 252507d84d10SNeilBrown *skipped = 1; 252607d84d10SNeilBrown return max_sector - sector_nr; 252707d84d10SNeilBrown } 25286394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 25296394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 25306394cca5SNeilBrown */ 2531e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2532e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2533191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2534191ea9b2SNeilBrown *skipped = 1; 2535191ea9b2SNeilBrown return sync_blocks; 2536191ea9b2SNeilBrown } 253717999be4SNeilBrown 2538c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2539c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2540c40f341fSGoldwyn Rodrigues */ 2541c40f341fSGoldwyn Rodrigues 2542c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2543c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 25441c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 254517999be4SNeilBrown 2546c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 25471da177e4SLinus Torvalds 25483e198f78SNeilBrown rcu_read_lock(); 25493e198f78SNeilBrown /* 25503e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 25513e198f78SNeilBrown * we might want to read from a different device. So we 25523e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 25533e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 25543e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 25553e198f78SNeilBrown * is OK. 25563e198f78SNeilBrown */ 25571da177e4SLinus Torvalds 25581da177e4SLinus Torvalds r1_bio->mddev = mddev; 25591da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2560191ea9b2SNeilBrown r1_bio->state = 0; 25611da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 25621da177e4SLinus Torvalds 25638f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 25643cb03002SNeilBrown struct md_rdev *rdev; 25651da177e4SLinus Torvalds bio = r1_bio->bios[i]; 25662aabaa65SKent Overstreet bio_reset(bio); 25671da177e4SLinus Torvalds 25683e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 25693e198f78SNeilBrown if (rdev == NULL || 25703e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 25718f19ccb2SNeilBrown if (i < conf->raid_disks) 2572e3b9703eSNeilBrown still_degraded = 1; 25733e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 25741da177e4SLinus Torvalds bio->bi_rw = WRITE; 25751da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 25761da177e4SLinus Torvalds write_targets ++; 25773e198f78SNeilBrown } else { 25783e198f78SNeilBrown /* may need to read from here */ 257906f60385SNeilBrown sector_t first_bad = MaxSector; 258006f60385SNeilBrown int bad_sectors; 258106f60385SNeilBrown 258206f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 258306f60385SNeilBrown &first_bad, &bad_sectors)) { 258406f60385SNeilBrown if (first_bad > sector_nr) 258506f60385SNeilBrown good_sectors = first_bad - sector_nr; 258606f60385SNeilBrown else { 258706f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 258806f60385SNeilBrown if (min_bad == 0 || 258906f60385SNeilBrown min_bad > bad_sectors) 259006f60385SNeilBrown min_bad = bad_sectors; 259106f60385SNeilBrown } 259206f60385SNeilBrown } 259306f60385SNeilBrown if (sector_nr < first_bad) { 25943e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 25953e198f78SNeilBrown if (wonly < 0) 25963e198f78SNeilBrown wonly = i; 25973e198f78SNeilBrown } else { 25983e198f78SNeilBrown if (disk < 0) 25993e198f78SNeilBrown disk = i; 26003e198f78SNeilBrown } 260106f60385SNeilBrown bio->bi_rw = READ; 260206f60385SNeilBrown bio->bi_end_io = end_sync_read; 26033e198f78SNeilBrown read_targets++; 2604d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2605d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2606d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2607d57368afSAlexander Lyakas /* 2608d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2609d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2610d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2611d57368afSAlexander Lyakas * this device alone for this sync request. 2612d57368afSAlexander Lyakas */ 2613d57368afSAlexander Lyakas bio->bi_rw = WRITE; 2614d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2615d57368afSAlexander Lyakas write_targets++; 26163e198f78SNeilBrown } 261706f60385SNeilBrown } 261806f60385SNeilBrown if (bio->bi_end_io) { 26193e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 26204f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 26213e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 26221da177e4SLinus Torvalds bio->bi_private = r1_bio; 26231da177e4SLinus Torvalds } 262406f60385SNeilBrown } 26253e198f78SNeilBrown rcu_read_unlock(); 26263e198f78SNeilBrown if (disk < 0) 26273e198f78SNeilBrown disk = wonly; 26283e198f78SNeilBrown r1_bio->read_disk = disk; 2629191ea9b2SNeilBrown 263006f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 263106f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 263206f60385SNeilBrown * need to mark them bad on all write targets 263306f60385SNeilBrown */ 263406f60385SNeilBrown int ok = 1; 26358f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 263606f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2637a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 263806f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 263906f60385SNeilBrown min_bad, 0 264006f60385SNeilBrown ) && ok; 264106f60385SNeilBrown } 264206f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 264306f60385SNeilBrown *skipped = 1; 264406f60385SNeilBrown put_buf(r1_bio); 264506f60385SNeilBrown 264606f60385SNeilBrown if (!ok) { 264706f60385SNeilBrown /* Cannot record the badblocks, so need to 264806f60385SNeilBrown * abort the resync. 264906f60385SNeilBrown * If there are multiple read targets, could just 265006f60385SNeilBrown * fail the really bad ones ??? 265106f60385SNeilBrown */ 265206f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 265306f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 265406f60385SNeilBrown return 0; 265506f60385SNeilBrown } else 265606f60385SNeilBrown return min_bad; 265706f60385SNeilBrown 265806f60385SNeilBrown } 265906f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 266006f60385SNeilBrown /* only resync enough to reach the next bad->good 266106f60385SNeilBrown * transition */ 266206f60385SNeilBrown good_sectors = min_bad; 266306f60385SNeilBrown } 266406f60385SNeilBrown 26653e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 26663e198f78SNeilBrown /* extra read targets are also write targets */ 26673e198f78SNeilBrown write_targets += read_targets-1; 26683e198f78SNeilBrown 26693e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 26701da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 26711da177e4SLinus Torvalds * drives must be failed - so we are finished 26721da177e4SLinus Torvalds */ 2673b7219ccbSNeilBrown sector_t rv; 2674b7219ccbSNeilBrown if (min_bad > 0) 2675b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2676b7219ccbSNeilBrown rv = max_sector - sector_nr; 267757afd89fSNeilBrown *skipped = 1; 26781da177e4SLinus Torvalds put_buf(r1_bio); 26791da177e4SLinus Torvalds return rv; 26801da177e4SLinus Torvalds } 26811da177e4SLinus Torvalds 2682c6207277SNeilBrown if (max_sector > mddev->resync_max) 2683c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 268406f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 268506f60385SNeilBrown max_sector = sector_nr + good_sectors; 26861da177e4SLinus Torvalds nr_sectors = 0; 2687289e99e8SNeilBrown sync_blocks = 0; 26881da177e4SLinus Torvalds do { 26891da177e4SLinus Torvalds struct page *page; 26901da177e4SLinus Torvalds int len = PAGE_SIZE; 26911da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 26921da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 26931da177e4SLinus Torvalds if (len == 0) 26941da177e4SLinus Torvalds break; 2695ab7a30c7SNeilBrown if (sync_blocks == 0) { 26966a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2697e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2698e5de485fSNeilBrown !conf->fullsync && 2699e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2700191ea9b2SNeilBrown break; 27017571ae88SNeilBrown if ((len >> 9) > sync_blocks) 27026a806c51SNeilBrown len = sync_blocks<<9; 2703ab7a30c7SNeilBrown } 2704191ea9b2SNeilBrown 27058f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 27061da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27071da177e4SLinus Torvalds if (bio->bi_end_io) { 2708d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 27091da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 27101da177e4SLinus Torvalds /* stop here */ 2711d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 27121da177e4SLinus Torvalds while (i > 0) { 27131da177e4SLinus Torvalds i--; 27141da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27156a806c51SNeilBrown if (bio->bi_end_io==NULL) 27166a806c51SNeilBrown continue; 27171da177e4SLinus Torvalds /* remove last page from this bio */ 27181da177e4SLinus Torvalds bio->bi_vcnt--; 27194f024f37SKent Overstreet bio->bi_iter.bi_size -= len; 2720b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 27211da177e4SLinus Torvalds } 27221da177e4SLinus Torvalds goto bio_full; 27231da177e4SLinus Torvalds } 27241da177e4SLinus Torvalds } 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds nr_sectors += len>>9; 27271da177e4SLinus Torvalds sector_nr += len>>9; 2728191ea9b2SNeilBrown sync_blocks -= (len>>9); 27291da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 27301da177e4SLinus Torvalds bio_full: 27311da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 27321da177e4SLinus Torvalds 2733c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2734c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2735c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2736c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2737c40f341fSGoldwyn Rodrigues /* Send resync message */ 2738c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2739c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2740c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2741c40f341fSGoldwyn Rodrigues } 2742c40f341fSGoldwyn Rodrigues 2743d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2744d11c171eSNeilBrown * compare 2745d11c171eSNeilBrown */ 2746d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2747d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 27482d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2749d11c171eSNeilBrown bio = r1_bio->bios[i]; 2750d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 27512d4f4f33SNeilBrown read_targets--; 2752ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 27531da177e4SLinus Torvalds generic_make_request(bio); 2754d11c171eSNeilBrown } 2755d11c171eSNeilBrown } 2756d11c171eSNeilBrown } else { 2757d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2758d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2759ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2760d11c171eSNeilBrown generic_make_request(bio); 2761d11c171eSNeilBrown 2762d11c171eSNeilBrown } 27631da177e4SLinus Torvalds return nr_sectors; 27641da177e4SLinus Torvalds } 27651da177e4SLinus Torvalds 2766fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 276780c3a6ceSDan Williams { 276880c3a6ceSDan Williams if (sectors) 276980c3a6ceSDan Williams return sectors; 277080c3a6ceSDan Williams 277180c3a6ceSDan Williams return mddev->dev_sectors; 277280c3a6ceSDan Williams } 277380c3a6ceSDan Williams 2774e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 27751da177e4SLinus Torvalds { 2776e8096360SNeilBrown struct r1conf *conf; 2777709ae487SNeilBrown int i; 27780eaf822cSJonathan Brassow struct raid1_info *disk; 27793cb03002SNeilBrown struct md_rdev *rdev; 2780709ae487SNeilBrown int err = -ENOMEM; 27811da177e4SLinus Torvalds 2782e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 27831da177e4SLinus Torvalds if (!conf) 2784709ae487SNeilBrown goto abort; 27851da177e4SLinus Torvalds 27860eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 27878f19ccb2SNeilBrown * mddev->raid_disks * 2, 27881da177e4SLinus Torvalds GFP_KERNEL); 27891da177e4SLinus Torvalds if (!conf->mirrors) 2790709ae487SNeilBrown goto abort; 27911da177e4SLinus Torvalds 2792ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2793ddaf22abSNeilBrown if (!conf->tmppage) 2794709ae487SNeilBrown goto abort; 2795ddaf22abSNeilBrown 2796709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 27971da177e4SLinus Torvalds if (!conf->poolinfo) 2798709ae487SNeilBrown goto abort; 27998f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 28001da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 28011da177e4SLinus Torvalds r1bio_pool_free, 28021da177e4SLinus Torvalds conf->poolinfo); 28031da177e4SLinus Torvalds if (!conf->r1bio_pool) 2804709ae487SNeilBrown goto abort; 2805709ae487SNeilBrown 2806ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 28071da177e4SLinus Torvalds 2808c19d5798SNeilBrown err = -EINVAL; 2809e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2810dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2811aba336bdSNeilBrown struct request_queue *q; 2812709ae487SNeilBrown int disk_idx = rdev->raid_disk; 28131da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 28141da177e4SLinus Torvalds || disk_idx < 0) 28151da177e4SLinus Torvalds continue; 2816c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 281702b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 2818c19d5798SNeilBrown else 28191da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 28201da177e4SLinus Torvalds 2821c19d5798SNeilBrown if (disk->rdev) 2822c19d5798SNeilBrown goto abort; 28231da177e4SLinus Torvalds disk->rdev = rdev; 2824aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 28251da177e4SLinus Torvalds 28261da177e4SLinus Torvalds disk->head_position = 0; 282712cee5a8SShaohua Li disk->seq_start = MaxSector; 28281da177e4SLinus Torvalds } 28291da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 28301da177e4SLinus Torvalds conf->mddev = mddev; 28311da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 283255ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 28331da177e4SLinus Torvalds 28341da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 283517999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 28361da177e4SLinus Torvalds 2837191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 283834db0cd6SNeilBrown conf->pending_count = 0; 2839d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2840191ea9b2SNeilBrown 284179ef3a8aSmajianpeng conf->start_next_window = MaxSector; 284279ef3a8aSmajianpeng conf->current_window_requests = conf->next_window_requests = 0; 284379ef3a8aSmajianpeng 2844c19d5798SNeilBrown err = -EIO; 28458f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 28461da177e4SLinus Torvalds 28471da177e4SLinus Torvalds disk = conf->mirrors + i; 28481da177e4SLinus Torvalds 2849c19d5798SNeilBrown if (i < conf->raid_disks && 2850c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2851c19d5798SNeilBrown /* This slot has a replacement. */ 2852c19d5798SNeilBrown if (!disk->rdev) { 2853c19d5798SNeilBrown /* No original, just make the replacement 2854c19d5798SNeilBrown * a recovering spare 2855c19d5798SNeilBrown */ 2856c19d5798SNeilBrown disk->rdev = 2857c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2858c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2859c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2860c19d5798SNeilBrown /* Original is not in_sync - bad */ 2861c19d5798SNeilBrown goto abort; 2862c19d5798SNeilBrown } 2863c19d5798SNeilBrown 28645fd6c1dcSNeilBrown if (!disk->rdev || 28655fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 28661da177e4SLinus Torvalds disk->head_position = 0; 28674f0a5e01SJonathan Brassow if (disk->rdev && 28684f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 286917571284SNeilBrown conf->fullsync = 1; 2870be4d3280SShaohua Li } 28711da177e4SLinus Torvalds } 2872709ae487SNeilBrown 2873709ae487SNeilBrown err = -ENOMEM; 28740232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 2875709ae487SNeilBrown if (!conf->thread) { 28761da177e4SLinus Torvalds printk(KERN_ERR 28779dd1e2faSNeilBrown "md/raid1:%s: couldn't allocate thread\n", 28781da177e4SLinus Torvalds mdname(mddev)); 2879709ae487SNeilBrown goto abort; 28801da177e4SLinus Torvalds } 2881191ea9b2SNeilBrown 2882709ae487SNeilBrown return conf; 2883709ae487SNeilBrown 2884709ae487SNeilBrown abort: 2885709ae487SNeilBrown if (conf) { 2886709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2887709ae487SNeilBrown kfree(conf->mirrors); 2888709ae487SNeilBrown safe_put_page(conf->tmppage); 2889709ae487SNeilBrown kfree(conf->poolinfo); 2890709ae487SNeilBrown kfree(conf); 2891709ae487SNeilBrown } 2892709ae487SNeilBrown return ERR_PTR(err); 2893709ae487SNeilBrown } 2894709ae487SNeilBrown 2895afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 2896849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 2897709ae487SNeilBrown { 2898e8096360SNeilBrown struct r1conf *conf; 2899709ae487SNeilBrown int i; 29003cb03002SNeilBrown struct md_rdev *rdev; 29015220ea1eSmajianpeng int ret; 29022ff8cc2cSShaohua Li bool discard_supported = false; 2903709ae487SNeilBrown 2904709ae487SNeilBrown if (mddev->level != 1) { 29059dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: raid level not set to mirroring (%d)\n", 2906709ae487SNeilBrown mdname(mddev), mddev->level); 2907709ae487SNeilBrown return -EIO; 2908709ae487SNeilBrown } 2909709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 29109dd1e2faSNeilBrown printk(KERN_ERR "md/raid1:%s: reshape_position set but not supported\n", 2911709ae487SNeilBrown mdname(mddev)); 2912709ae487SNeilBrown return -EIO; 2913709ae487SNeilBrown } 2914709ae487SNeilBrown /* 2915709ae487SNeilBrown * copy the already verified devices into our private RAID1 2916709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2917afa0f557SNeilBrown * should be freed in raid1_free()] 2918709ae487SNeilBrown */ 2919709ae487SNeilBrown if (mddev->private == NULL) 2920709ae487SNeilBrown conf = setup_conf(mddev); 2921709ae487SNeilBrown else 2922709ae487SNeilBrown conf = mddev->private; 2923709ae487SNeilBrown 2924709ae487SNeilBrown if (IS_ERR(conf)) 2925709ae487SNeilBrown return PTR_ERR(conf); 2926709ae487SNeilBrown 2927c8dc9c65SJoe Lawrence if (mddev->queue) 29285026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 29295026d7a9SH. Peter Anvin 2930dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 29311ed7242eSJonathan Brassow if (!mddev->gendisk) 29321ed7242eSJonathan Brassow continue; 2933709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2934709ae487SNeilBrown rdev->data_offset << 9); 29352ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 29362ff8cc2cSShaohua Li discard_supported = true; 2937709ae487SNeilBrown } 2938709ae487SNeilBrown 2939709ae487SNeilBrown mddev->degraded = 0; 2940709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2941709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2942709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2943709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2944709ae487SNeilBrown mddev->degraded++; 2945709ae487SNeilBrown 2946709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2947709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2948709ae487SNeilBrown 29498c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 29509dd1e2faSNeilBrown printk(KERN_NOTICE "md/raid1:%s: not clean" 29518c6ac868SAndre Noll " -- starting background reconstruction\n", 29528c6ac868SAndre Noll mdname(mddev)); 29531da177e4SLinus Torvalds printk(KERN_INFO 29549dd1e2faSNeilBrown "md/raid1:%s: active with %d out of %d mirrors\n", 29551da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 29561da177e4SLinus Torvalds mddev->raid_disks); 2957709ae487SNeilBrown 29581da177e4SLinus Torvalds /* 29591da177e4SLinus Torvalds * Ok, everything is just fine now 29601da177e4SLinus Torvalds */ 2961709ae487SNeilBrown mddev->thread = conf->thread; 2962709ae487SNeilBrown conf->thread = NULL; 2963709ae487SNeilBrown mddev->private = conf; 2964709ae487SNeilBrown 29651f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 29661da177e4SLinus Torvalds 29671ed7242eSJonathan Brassow if (mddev->queue) { 29682ff8cc2cSShaohua Li if (discard_supported) 29692ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 29702ff8cc2cSShaohua Li mddev->queue); 29712ff8cc2cSShaohua Li else 29722ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 29732ff8cc2cSShaohua Li mddev->queue); 29741ed7242eSJonathan Brassow } 29755220ea1eSmajianpeng 29765220ea1eSmajianpeng ret = md_integrity_register(mddev); 29775aa61f42SNeilBrown if (ret) { 29785aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 2979afa0f557SNeilBrown raid1_free(mddev, conf); 29805aa61f42SNeilBrown } 29815220ea1eSmajianpeng return ret; 29821da177e4SLinus Torvalds } 29831da177e4SLinus Torvalds 2984afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 29851da177e4SLinus Torvalds { 2986afa0f557SNeilBrown struct r1conf *conf = priv; 29874b6d287fSNeilBrown 29881da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 29891da177e4SLinus Torvalds kfree(conf->mirrors); 29900fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 29911da177e4SLinus Torvalds kfree(conf->poolinfo); 29921da177e4SLinus Torvalds kfree(conf); 29931da177e4SLinus Torvalds } 29941da177e4SLinus Torvalds 2995fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 29961da177e4SLinus Torvalds { 29971da177e4SLinus Torvalds /* no resync is happening, and there is enough space 29981da177e4SLinus Torvalds * on all devices, so we can resize. 29991da177e4SLinus Torvalds * We need to make sure resync covers any new space. 30001da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 30011da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 30021da177e4SLinus Torvalds * worth it. 30031da177e4SLinus Torvalds */ 3004a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3005a4a6125aSNeilBrown if (mddev->external_size && 3006a4a6125aSNeilBrown mddev->array_sectors > newsize) 3007b522adcdSDan Williams return -EINVAL; 3008a4a6125aSNeilBrown if (mddev->bitmap) { 3009a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3010a4a6125aSNeilBrown if (ret) 3011a4a6125aSNeilBrown return ret; 3012a4a6125aSNeilBrown } 3013a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3014f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 3015449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 3016b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3017b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 301858c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 30191da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 30201da177e4SLinus Torvalds } 3021b522adcdSDan Williams mddev->dev_sectors = sectors; 30224b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 30231da177e4SLinus Torvalds return 0; 30241da177e4SLinus Torvalds } 30251da177e4SLinus Torvalds 3026fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 30271da177e4SLinus Torvalds { 30281da177e4SLinus Torvalds /* We need to: 30291da177e4SLinus Torvalds * 1/ resize the r1bio_pool 30301da177e4SLinus Torvalds * 2/ resize conf->mirrors 30311da177e4SLinus Torvalds * 30321da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 30331da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 30341da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 30356ea9c07cSNeilBrown * 30366ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 30376ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 30381da177e4SLinus Torvalds */ 30391da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 30401da177e4SLinus Torvalds struct pool_info *newpoolinfo; 30410eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3042e8096360SNeilBrown struct r1conf *conf = mddev->private; 304363c70c4fSNeilBrown int cnt, raid_disks; 3044c04be0aaSNeilBrown unsigned long flags; 3045b5470dc5SDan Williams int d, d2, err; 30461da177e4SLinus Torvalds 304763c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3048664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 304963c70c4fSNeilBrown mddev->layout != mddev->new_layout || 305063c70c4fSNeilBrown mddev->level != mddev->new_level) { 3051664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 305263c70c4fSNeilBrown mddev->new_layout = mddev->layout; 305363c70c4fSNeilBrown mddev->new_level = mddev->level; 305463c70c4fSNeilBrown return -EINVAL; 305563c70c4fSNeilBrown } 305663c70c4fSNeilBrown 305728c1b9fdSGoldwyn Rodrigues if (!mddev_is_clustered(mddev)) { 3058b5470dc5SDan Williams err = md_allow_write(mddev); 3059b5470dc5SDan Williams if (err) 3060b5470dc5SDan Williams return err; 306128c1b9fdSGoldwyn Rodrigues } 30622a2275d6SNeilBrown 306363c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 306463c70c4fSNeilBrown 30656ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 30666ea9c07cSNeilBrown cnt=0; 30676ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 30681da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 30696ea9c07cSNeilBrown cnt++; 30706ea9c07cSNeilBrown if (cnt > raid_disks) 30711da177e4SLinus Torvalds return -EBUSY; 30726ea9c07cSNeilBrown } 30731da177e4SLinus Torvalds 30741da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 30751da177e4SLinus Torvalds if (!newpoolinfo) 30761da177e4SLinus Torvalds return -ENOMEM; 30771da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 30788f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 30791da177e4SLinus Torvalds 30801da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 30811da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 30821da177e4SLinus Torvalds if (!newpool) { 30831da177e4SLinus Torvalds kfree(newpoolinfo); 30841da177e4SLinus Torvalds return -ENOMEM; 30851da177e4SLinus Torvalds } 30860eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 30878f19ccb2SNeilBrown GFP_KERNEL); 30881da177e4SLinus Torvalds if (!newmirrors) { 30891da177e4SLinus Torvalds kfree(newpoolinfo); 30901da177e4SLinus Torvalds mempool_destroy(newpool); 30911da177e4SLinus Torvalds return -ENOMEM; 30921da177e4SLinus Torvalds } 30931da177e4SLinus Torvalds 3094e2d59925SNeilBrown freeze_array(conf, 0); 30951da177e4SLinus Torvalds 30961da177e4SLinus Torvalds /* ok, everything is stopped */ 30971da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 30981da177e4SLinus Torvalds conf->r1bio_pool = newpool; 30996ea9c07cSNeilBrown 3100a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 31013cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3102a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 310336fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3104a88aa786SNeilBrown rdev->raid_disk = d2; 310536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 310636fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 3107a88aa786SNeilBrown printk(KERN_WARNING 310836fad858SNamhyung Kim "md/raid1:%s: cannot register rd%d\n", 310936fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3110a88aa786SNeilBrown } 3111a88aa786SNeilBrown if (rdev) 3112a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 31136ea9c07cSNeilBrown } 31141da177e4SLinus Torvalds kfree(conf->mirrors); 31151da177e4SLinus Torvalds conf->mirrors = newmirrors; 31161da177e4SLinus Torvalds kfree(conf->poolinfo); 31171da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 31181da177e4SLinus Torvalds 3119c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 31201da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3121c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 31221da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 312363c70c4fSNeilBrown mddev->delta_disks = 0; 31241da177e4SLinus Torvalds 3125e2d59925SNeilBrown unfreeze_array(conf); 31261da177e4SLinus Torvalds 3127985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 31281da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 31291da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 31301da177e4SLinus Torvalds 31311da177e4SLinus Torvalds mempool_destroy(oldpool); 31321da177e4SLinus Torvalds return 0; 31331da177e4SLinus Torvalds } 31341da177e4SLinus Torvalds 3135fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 313636fa3063SNeilBrown { 3137e8096360SNeilBrown struct r1conf *conf = mddev->private; 313836fa3063SNeilBrown 313936fa3063SNeilBrown switch(state) { 31406eef4b21SNeilBrown case 2: /* wake for suspend */ 31416eef4b21SNeilBrown wake_up(&conf->wait_barrier); 31426eef4b21SNeilBrown break; 31439e6603daSNeilBrown case 1: 314407169fd4Smajianpeng freeze_array(conf, 0); 314536fa3063SNeilBrown break; 31469e6603daSNeilBrown case 0: 314707169fd4Smajianpeng unfreeze_array(conf); 314836fa3063SNeilBrown break; 314936fa3063SNeilBrown } 315036fa3063SNeilBrown } 315136fa3063SNeilBrown 3152fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3153709ae487SNeilBrown { 3154709ae487SNeilBrown /* raid1 can take over: 3155709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3156709ae487SNeilBrown */ 3157709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3158e8096360SNeilBrown struct r1conf *conf; 3159709ae487SNeilBrown mddev->new_level = 1; 3160709ae487SNeilBrown mddev->new_layout = 0; 3161709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3162709ae487SNeilBrown conf = setup_conf(mddev); 3163709ae487SNeilBrown if (!IS_ERR(conf)) 316407169fd4Smajianpeng /* Array must appear to be quiesced */ 316507169fd4Smajianpeng conf->array_frozen = 1; 3166709ae487SNeilBrown return conf; 3167709ae487SNeilBrown } 3168709ae487SNeilBrown return ERR_PTR(-EINVAL); 3169709ae487SNeilBrown } 31701da177e4SLinus Torvalds 317184fc4b56SNeilBrown static struct md_personality raid1_personality = 31721da177e4SLinus Torvalds { 31731da177e4SLinus Torvalds .name = "raid1", 31742604b703SNeilBrown .level = 1, 31751da177e4SLinus Torvalds .owner = THIS_MODULE, 3176849674e4SShaohua Li .make_request = raid1_make_request, 3177849674e4SShaohua Li .run = raid1_run, 3178afa0f557SNeilBrown .free = raid1_free, 3179849674e4SShaohua Li .status = raid1_status, 3180849674e4SShaohua Li .error_handler = raid1_error, 31811da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 31821da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 31831da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3184849674e4SShaohua Li .sync_request = raid1_sync_request, 31851da177e4SLinus Torvalds .resize = raid1_resize, 318680c3a6ceSDan Williams .size = raid1_size, 318763c70c4fSNeilBrown .check_reshape = raid1_reshape, 318836fa3063SNeilBrown .quiesce = raid1_quiesce, 3189709ae487SNeilBrown .takeover = raid1_takeover, 31905c675f83SNeilBrown .congested = raid1_congested, 31911da177e4SLinus Torvalds }; 31921da177e4SLinus Torvalds 31931da177e4SLinus Torvalds static int __init raid_init(void) 31941da177e4SLinus Torvalds { 31952604b703SNeilBrown return register_md_personality(&raid1_personality); 31961da177e4SLinus Torvalds } 31971da177e4SLinus Torvalds 31981da177e4SLinus Torvalds static void raid_exit(void) 31991da177e4SLinus Torvalds { 32002604b703SNeilBrown unregister_md_personality(&raid1_personality); 32011da177e4SLinus Torvalds } 32021da177e4SLinus Torvalds 32031da177e4SLinus Torvalds module_init(raid_init); 32041da177e4SLinus Torvalds module_exit(raid_exit); 32051da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 32060efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 32071da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3208d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 32092604b703SNeilBrown MODULE_ALIAS("md-level-1"); 321034db0cd6SNeilBrown 321134db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3212